105results about How to "Eliminate transmission backlash" patented technology

The invention relates to a large precise numerical control rotating table. The large precise numerical control rotating table comprises a table base, a table spindle, worms and worm gears which are mounted in both sides of the table base and a reducer and a servo motor which are connected with the worm in one side of the table base. The large precise numerical control rotating table is characterized in that the worm in the other side of the table base is connected with the reducer and the servo motor by a coupling so as to form a driven worm gear pair for providing a resistance moment for the table base; and the outer circumference of the table base is provided with a plurality of static pressure support pads, a clearance is left between the lower end surface of the table spindle and the static pressure support pads, three rows of cylindrical roller rotating table bearings are mounted between the table spindle and the table base, and the inner rings of the three rows of cylindrical roller rotating table bearings are provided with steel scales. The invention solves the problems that the rotary positioning accuracy is low, the table runout of the rotating table can not meet the accuracy requirements, the supported workpiece can not bear a large impact force as a result of restricted eccentric center and the like. Besides, the invention greatly improves the transmission smoothness of the rotating table and prolongs the service life of the bearing.

The invention relates to a two-motor drive modular joint. According to the two-motor drive modular joint, an output shaft is rotationally connected with a shell and fixedly connected with an output gear; the output shaft comprises a through hole extending in the axial direction; the shell comprises a penetrating hole corresponding to the through hole, and the through hole and the penetrating holeare used for storing a line; the output shaft further comprises a radial channel which cooperates with a zero-bit detection module to determine the zero bit; a first gear and a second gear are engagedwith the output gear and are free of interference; a first servo motor is connected with the first gear and a first motor encoder; and a second servo motor is connected with the second gear and a second motor encoder. The two-motor drive modular joint can eliminate the gap between the output gear and a drive device, so that transmission is more precise, and the joint can still run in a gapless mode even when the gears are abraded. The zero-bit detection module is used for determining the zero bit of the output shaft. Through cooperation of the penetrating hole and the through hole, various cables can be arranged inside the joint, and thus the joint is simple and compact as a whole.

The invention discloses a multi-cam self-adaptive multi-gear automatic transmission countershaft. The countershaft comprises a supporting shaft and a mechanical intelligent self-adaptive variable speed assembly located on the supporting shaft. The mechanical intelligent self-adaptive variable speed assembly comprises an overrun clutch, a torus axial outer taper sleeve, a torus axial inner taper sleeve and a variable speed elastic component. The multi-cam self-adaptive multi-gear automatic transmission countershaft is used in transmissions, has all the advantages of an existing cam self-adaptive automatic transmission, and is of a multi-cam structure, therefore, sensitivity in the gear shifting process is ensured, jerking feeling and jam feeling during gear shifting are eliminated, driving comfort is improved, furthermore, energy is saved and consumption is reduced; the dynamic property, economical efficiency, driving safety and driving comfort of a vehicle are greatly improve. In addition, by means of cams and the cooperative relationships among the cams, a clutch is locked after separation, elimination of the transmission gaps among transmission components is facilitated, transmission precision and efficiency are improved, and drive energy is saved.

The invention relates to the technical field of industrial robots, in particular to a two-degree-of-freedom joint structure. The two-degree-of-freedom joint structure comprises a first rack, a first driving device, a first gear shaft, a first bevel gear, a second rack, a second driving device, a second gear shaft, a second bevel gear, a third rack, an output gear shaft, an output bevel gear, a clearance-elimination driving device, a clearance-elimination gear shaft and a clearance-elimination bevel gear. The first bevel gear is arranged on the first gear shaft, and the first driving device drives the first gear shaft to rotate. The second bevel gear is arranged on the second gear shaft, and the second driving device drives the second gear shaft to rotate. The output bevel gear is arranged on the output gear shaft. The clearance-elimination gear is arranged on the clearance-elimination gear shaft, and the clearance-elimination driving device drives the clearance-elimination gear shaft to rotate. The output bevel gear and the clearance-elimination bevel gear are engaged with the first bevel gear and the second bevel gear correspondingly at the same time. By adoption of the two-degree-of-freedom joint structure, the pitching motion can be achieved, the revolving motion and the pitching and revolving combined motion can also be achieved, and the transmission precision is higher.

The invention provides a planetary gear transmission mechanism which comprises a sun wheel, planet wheels and a few-tooth-difference transmission mechanism. In order to improve the precision, gear teeth of two inner gear rings and gear teeth of two few-tooth-difference gears are variable-tooth-thickness involute gear teeth; the rotation directions of the helix angles of the two inner gear rings are opposite, and a clearance-eliminating elastic body is arranged between a pair of few-tooth-difference gears. The planetary gear transmission mechanism has the advantages of being high in rigidity and precision, large in transmission ratio and torque, and capable of greatly lowering machining difficulty. The invention further provides a robot joint reducer which comprises the planetary gear transmission mechanism. The robot joint reducer has the advantages of being scientific in design, small in size, high in precision, large in transmission ratio and torque, and capable of greatly lowering machining difficulty. The invention further provides a robot which comprises the robot joint reducer. The robot has the advantages of being scientific in design, high in precision, large in transmission ratio and torque, and capable of greatly lowering machining difficulty.

The invention relates to a two-degree-of-freedom joint structure driven by three motors. The two-degree-of-freedom joint structure comprises a first motor reducer, a second motor reducer, a third motor reducer, a first transmission system, a second transmission system, a third transmission system, an output system, an intermediate connector, a rack and a housing, wherein the rack is connected withthe housing through the intermediate connector; the first motor reducer, the second motor reducer and the third motor reducer are mounted on the rack; the output system comprises a third supporting frame and an output bevel gear; the output bevel gear is connected with the third supporting frame in a sleeving manner; the first motor reducer drives, through the transmission of the first transmission system, the output bevel gear to rotate; the second motor reducer drives, through the transmission of the second transmission system, the output bevel gear to rotate; and the third motor reducer drives, through the transmission of the third transmission system, the third supporting frame to act. The two-degree-of-freedom joint structure can realize autoroatation and pitching motion and meanwhile eliminate the transmission return difference of reverse motion, thereby finally improving the transmission accuracy greatly.

The invention relates to a gear and rack transmission anti-backlash mechanism. The gear and rack transmission anti-backlash mechanism comprises a gear and a rack. The rack is formed by stacking a first rack body and a second rack body and is meshed with the gear. The anti-backlash mechanism further comprises a lead screw shaft, a bearing support, needle bearings, a nut, a nut support and a plane spiral spring which are placed in a cavity formed in the first rack body and the second rack body. The two ends of the lead screw shaft are installed on the bearing support through the needle bearings, and the bearing support is fixed to the second rack body. The lead screw shaft is matched with the nut, and the nut is installed on the first rack body through the nut support. The two ends of the plane spiral spring are fixed to the lead screw shaft and the second rack body respectively. According to the anti-backlash mechanism, when a transmission backlash occurs between the gear and the rack, teeth of the two rack bodies are staggered under the elasticity effect of the spiral spring, the equivalent tooth thickness is increased, the transmission backlash between the gear and the rack is eliminated, transmission torque is large, the structure is simple, work is reliable, and the gear and rack transmission anti-backlash mechanism is suitable for the field of numerical control without backlash transmission, and especially for high-accuracy numerical control machine tools and robots.

The invention relates to the technical field of vehicle chassis and discloses a body roll driving mechanism and a vehicle applying the same. The body roll driving mechanism comprises a frame, a body,a left crankshaft, a left connecting rod, a right crankshaft, a right connecting rod, a left gear, a middle gear and a right gear. The body and the frame are rotatably connected around roll axis, theleft crankshaft, the left connecting rod and the right connecting rod form two moving chains connecting the body and the frame, the left, middle and right gears are in engaged transmission, the left gear, the left crankshaft, the right gear and the right crankshaft rotate at equal angles in a same direction, an actuator drives the middle gear to rotate, the body is driven by the double serial moving chains to roll, a closed transmission loop eliminates a transmission gap and reduces moving impact, so that the stability and reliability of a vehicle in the roll process are improved. When the body roll driving mechanism is applied to the vehicle turning or travelling on an inclined pavement, the body inclines a certain angle actively to resist the centrifugal force or the rollover force, so that a stable driving gesture of the vehicle is kept.

The invention relates to a metal powder electron beam melting lamination layer shaping workbench z-axis movement system, and belongs to the field of three-dimensional rapid forming and manufacturing. The top of a second-stage speed change mechanism is fixedly connected with a supporting mechanism, a first-stage speed change mechanism is fixedly connected with the supporting mechanism, and a worm gear of the first-stage speed change mechanism is connected with a lower screw nut of the second-stage speed change mechanism through a key. The metal powder electron beam melting lamination layer shaping workbench z-axis movement system has the advantages that the structure is novel; a servo motor, a worm and gear and a ball screw serve as key parts, the transmission accuracy of the whole system is remarkably improved compared with transmission accuracy of an existing transmission system, and therefore powder material and workpiece vibration can be reduced, the manufacturing accuracy of a workpiece is improved, and the system is suitable for high-precision electron beam melting forming systems for manufacturing heavy test pieces.

The invention discloses a six-freedom-degree manipulator driven by two motors and belongs to the technical field of industrial robots. A manipulator base worm wheel can be driven through a base first servo motor speed reducer and a base second servo motor speed reducer simultaneously. A shoulder joint output shaft can be driven through a shoulder joint first servo motor speed reducer and a shoulder joint second servo motor speed reducer simultaneously. An elbow joint first output bevel gear can be driven through an elbow joint first servo motor speed reducer and an elbow joint second servo motor speed reducer or an elbow joint third servo motor speed reducer and an elbow joint fourth servo motor speed reducer simultaneously. A wrist joint first output bevel gear can be driven through a wrist joint first servo motor speed reducer and a wrist joint second servo motor speed reducer or a wrist joint third servo motor speed reducer and a wrist joint fourth servo motor speed reducer simultaneously. Therefore, the gear transmission clearance can be eliminated by loading moment on the servo motor speed reducers through a controller to form a moment difference, and the transmission accuracy of the manipulator is improved accordingly.

The invention relates to a double-pendulum head structure driven by differential double motors. Both a first differential input unit and a second differential input unit are driven by double motors, so that pendulum heads have large tilt angles and torques, the driving motors and speed reducers of the two differential input units are arranged on the outer side of a U-shaped support, and moving members of the pendulum heads only include pitching pendulum shafts, rotary pendulum shafts on the pitching pendulum shafts, main shaft boxes and main shaft motors, so that the mass of the moving members of the pendulum heads is integrally reduced. The equal torques in opposite directions are loaded between a driving servo motor and a driven servo motor, so as to form certain torque difference; due to the existence of the torque difference, driving bevel gears of the differential input units are reversely engaged to a driving bevel gear of a differential output unit; under the action of reverse engagement, the transmission clearance of the differential input units is smoothly eliminated, so that non-clearance transmission of the differential input units is realized. Through the non-clearance transmission of the first differential input unit and the second differential input unit, the kinematic accuracy of the pendulum heads is guaranteed ultimately.

The invention relates to a gear rack drive revolving worktable. The gear rack drive revolving worktable comprises a working table, a box, a lifting driving mechanism, a revolving driving mechanism and a gap eliminating mechanism, wherein the revolving driving mechanism is driven by a gear and a rack; the rack is formed by laminating two racks; and the gap eliminating mechanism comprises a lead screw shaft, a bearing bracket, a rolling needle bearing, a nut, a nut bracket and a plane scroll spring placed in a cavity formed in the two racks. The revolving worktable is driven by a hydraulic cylinder, can realize 180 degrees of fixed-angle transposition, can automatically eliminate the gap, and is large in transfer torque, simple in structure and reliable in operation.

The invention relates to the field of gear design, in particular to a gear assembly capable of eliminating transmission gaps. The gear assembly comprises a gear shaft, a first helical gear, a second helical gear, a spring and an adjusting mechanism. The gear shaft is sleeved with the first helical gear, and the first helical gear is in interference fit with the gear shaft. The gear shaft is sleeved with the second helical gear in a clearance fit mode. The spring and the adjusting mechanism are installed on the gear shaft. The spring is arranged between the second helical gear and the adjusting mechanism, one end of the spring is made to abut against the right end face of the second helical gear, and the other end of the spring is made to abut against the adjusting mechanism. According to the technical scheme, when the gears are meshed, the transmission gaps between gear teeth can be eliminated, in this way, transmission precision and stability are improved, meanwhile, the abrasion speed of the gear teeth is decreased, the service life of the gears is prolonged, and noise is lowered.

The invention relates to a numerical-control large-scale precise dual-drive gap removing rotating working table. The numerical-control large-scale precise dual-drive gap removing rotating working table comprises a working table body, a hollow spindle and a worm gear hub, wherein the hollow spindle and the worm gear hub are arranged on the working table body. An encoder is arranged on the hollow spindle. The worm gear hub is capable of rotating around the hollow spindle through a radial support. A worm gear is fixedly connected on the worm gear hub. Worm, epicyclic gear boxes and servo motors are respectively arranged on two sides of the working table body, wherein the worms, the epicyclic gear boxes and the servo motors are connected in sequence. The worms on the two sides of the working table body are all meshed with the worm gear, and a dual-drive structure of providing driving moment at the same time is formed, or a dual-drive gap removing structure of respectively providing driving moment and resisting moment is formed. The numerical-control large-scale precise dual-drive gap removing rotating working table has the advantages that the problem of transmission accuracy of the large-scale rotating working table is low is solved, and transmission stability can be improved effectively, and service life of the rotating working table is prolonged.

The invention provides a direct drive type precise micro displacement actuator for a polar environment, and relates to the precise micro displacement actuator. The precise micro displacement actuator aims to solve the problem that no supporting and adjusting mechanism exists for a large spliced mirror surface telescope panel under the polar low-temperature environment. The precise micro displacement actuator comprises a movement supporting mechanism, a drive mechanism and an anti-backlash screw transmission mechanism. The movement supporting mechanism comprises a flexible shaft, an end cover, a shell and a bottom cover. The shell is open at the two ends, and the end cover and the bottom cover are arranged at the two ends of the shell in a covering mode. The drive mechanism comprises an elastic coupling, a motor connection plate and a stepping motor. The anti-backlash screw transmission mechanism comprises a guidance key, a drive rod, a transmission nut, a spring sleeve, a screw rod, pretightening springs, an anti-backlash nut and anti-rotation bolts. The direct drive type precise micro displacement actuator is used for multi-point supporting and adjusting a sub mirror panel of a spliced mirror surface astronomical telescope.

The present invention provides a quad redundant angular displacement sensor. The sensor comprises a hollow U-shaped housing (2), the U-shaped housing (2) and a cover plate (3) are connected with each other through two screws to form the support structure of the whole sensor; a gear shaft (4) is installed on the U-shaped housing (2) and the cover plate (3) through inter-axis bearing (5) and a axis-end bearing (7), and the angular displacement sensors (9) of the four angular displacement sensor assemblies (1) are symmetrically installed at the bottom of the U-shaped housing (2) through a small pressing plate (8); and the gears (10) of the four angular displacement sensor assemblies (1) and anti-backlash gears (11) are symmetrically installed in the cavity of the U-shaped housing (2), and the gears (10) and the anti-backlash gears (11) re engaged with the gear of the gear shaft (4). The quad redundant angular displacement sensor is small in size, compact in structure, light in quality and high in reliability.

The invention discloses an automatic alignment center rack. The automatic alignment center rack is characterized by comprising a machine box, a driving device, a translation cam, an upper pressing rodcomponent, a lower pressing rod component and pressing head components, the translation cam is arranged inside the machine box in a left and right sliding manner and is driven by the driving device to move left and right, an upper pressing rod on the upper pressing rod component and a lower pressing rod are made to swing by the translation cam to make the pressing head components located on the upper pressing rod and the lower pressing rod and the pressing head component on the translation cam be simultaneously closed to the axis of a workpiece to be machined, so that the workpiece to be machined is supported, wheel support racks of the pressing head components automatically rotate according to the shape of the outer edge surface of the workpiece to be machined, and two support wheels ofeach wheel support rack are guaranteed to be pressed tightly against the workpiece to be machined simultaneously.

The invention discloses a gear-driven backlash eliminating mechanism, comprising a main gear including an axial through cavity, backlash eliminating gears arranged on one side of the main gear in parallel, a torsion rod and an internal bevel gear, wherein the outer wall of the other side of the main gear is provided with an outer spline along an axial direction; the torsion rod can rotationally perforates the through cavity; the extending part of one side of the torsion rod is fixedly connected with a pin shaft vertical to the axial direction; the backlash eliminating gears are mounted on the pin shaft; an external skewed tooth section is formed on the outer wall of the extending part of the other side of the torsion rod along the axial direction; an internal bevel gear is sleeved on the other side of the torsion rod; a step-shaped mounting slotted hole is formed on the inner side of the internal bevel gear along the axial direction; an inner spline and the internal skewed tooth section are arranged in the mounting slotted hole along the axial direction; the outer spline of the main gear is matched with the inner spline of the internal bevel gear; and an outer skewed tooth section on the extending part of the other side of the torsion rod is engaged with the inner skewed tooth section of the internal bevel gear. According to the invention, gear-driven backlash can be eliminated; a teeth engaging gap can also be eliminated; in addition, the gear-driven backlash eliminating mechanism has advantages of convenient regulation and easy operation.

An airborne photoelectric-platform outer frame elimination clearance torque motor driving shafting module belongs to a torque motor driving shafting module in an aviation optoelectronics technology field. The invention aims at providing a photoelectric-platform outer frame elimination clearance torque motor driving shafting module. In a technical scheme, a torque motor base, a torque motor stator, a torque motor shaft, a harmonic reducer input shaft, a bearing, a harmonic reducer, a torque motor rotor, an outer orientation frame, an outer high-low frame and the like are comprised. The torque motor base is fixed on the outer orientation frame. The harmonic reducer is fixed on the torque motor base. The harmonic reducer input shaft is connected with a wave generator of the harmonic reducer.The torque motor shaft is connected with the harmonic reducer input shaft. The torque motor rotor forms interference fit with the torque motor shaft. The torque motor stator is fixed on the torque motor base. The outer high-low frame is connected with a flexible gear of the harmonic reducer. By using the torque motor driving shafting module, gear transmission clearance can be eliminated and resetting is easy.

The invention discloses a speed regulation device of a cylinder, which is energy-saving and is capable of improving speed stability and reducing transmission gaps among a piston ring, a piston and a piston rod. The speed regulation device comprises an air source, a first throttle valve, a first pressure regulation valve, a flow divider valve, a second throttle valve and a second pressure regulation valve, compressed air in the air source flows into the first throttle valve, the first pressure regulation valve and a rodless cavity of the cylinder in sequence by the aid of the flow divider valve, and other compressed air in the air source flows into the second throttle valve, the second throttle valve and a cavity with a rod of the cylinder in sequence by the aid of the flow divider valve.

The invention discloses an automatic welding machine and a welding method for steel structural parts. The automatic welding machine for the steel structural parts comprises a portal frame which spans on a steel structural part to be welded and can longitudinally move along the steel structural part, and a welding arm which is arranged in the portal frame; and the welding arm comprises a mechanical arm, a mounting plate fixedly arranged at the upper end of the mechanical arm, a transverse moving device arranged at the top of the portal frame and used for driving the mounting plate to transversely move, a connecting plate fixedly arranged at the lower end of the mechanical arm, a welding gun fixedly arranged on the connecting plate and a three-dimensional imaging device arranged beside the welding gun and fixedly connected with the connecting plate. According to the automatic welding machine for the steel structural parts provided by the invention, manual welding of the steel structural parts is replaced, normal welding is guaranteed, and the welding efficiency is improved. A turnover device enables the steel structural parts to be turned over automatically, manual participation is not needed, the efficiency is further improved, and the labor intensity is reduced.

The invention relates to the technical field of mechanical transmission manufacturing, in particular to a clearance eliminating device for a gear pair. The clearance eliminating device for the gear pair comprises a transmission shaft, a driven gear fixedly arranged on the transmission shaft, and a hydraulic system. A frictional damping disc and a rear cover are sequentially arranged on the left side of the driven gear. An oil cavity is formed between the frictional damping disc and the rear cover. A gearbox casing is located on the outer circumferential walls of the frictional damping disc and the rear cover. An oil port connected with the oil cavity is formed in the gearbox casing. According to the clearance eliminating device for the gear pair, hydraulic damping force is generated by the hydraulic system, and the driven gear in the gear pair is under the effect of frictional resistance in the transmission process, so that additional force is generated between tooth sides of the gear pair, and it is guaranteed that meshing teeth can be kept in the pressed state at all transmission moments in the transmission process of the gear pair.

The invention provides a printing module of a cigarette making and plug assembling machine. A flat key is arranged on the outer circumference surface of a steel seal roller transmission shaft; a key groove is formed in the inner circumference surface of a steel seal roller; the flat key is matched with the key groove; the steel seal roller is also provided with a threaded hole penetrating through the inner circumference surface; the threaded hole is matched with a locking screw; and the locking screw is propped against the steel seal roller transmission shaft. The printing module has the advantages that the threaded hole is formed in the steel seal roller and is matched with the locking screw, and the purpose that the steel seal roller is locked is completely achieved, so that a transmission gap between the steel seal roller and the steel seal roller transmission shaft is eliminated, the damage to the steel seal roller transmission shaft and the slot groove is avoided, the phenomenon of steel seal polychrome brand escape is thoroughly solved, the thought is skillful and practical, meanwhile, two steel seal rollers of the printing module share one printing roller, after a steel seal on the left side of cigarette paper is printed, the steel seal on the right side is immediately printed, the distance between the left steel seal and the right steel seal is short, the overlap of steel seals caused by the conveying fluctuation of the cigarette paper is avoided, the steel seal polychrome printing accuracy is high, and the printing module is particularly suitable for the cigarette production with high printing accuracy requirements.

The invention relates to a stroke position control device of a valve executing mechanism, which comprises a stroke input end, a case, a base plate, a drive shaft, a drive gear set, a microswitch, a potentiometer, a scene opening indication mechanism, and the like. Motion is input by the stroke input end, passes through the drive gear set and the gear shaft and finally drives the microswitch, the potentiometer and the scene opening indication mechanism, therefore, the control and indication of opening and closing the valve are realized. The invention combines a stroke position control mechanism and a signal indicating mechanism and greatly reduces installation space, thereby shortening the structural size of the control part of the valve executing mechanism, eliminating the clearance of the gear drive set in the stroke position control mechanism and the signal indicating mechanism and further improving regulation and control precision.

The invention discloses a zero-return-difference harmonic gear transmission device. The zero-return-difference harmonic gear transmission device comprises a rigid gear, a flexible gear and a wave generator; the wave generator is composed of a flexible bearing and an elastic cam; the flexible gear is located in the rigid gear; the upper end and the lower end of the flexible gear mesh with the upper end and the lower end of the rigid gear; the flexible bearing is located between the elastic cam and the flexible gear; the shape of the elastic cam is oval; a shaft hole is formed in the center of the elastic cam; and two structural holes used for forming thin walls of the cam at the two ends in the long axis direction of the elastic cam are formed in the positions, located on the two sides of the shaft hole, in the long axis direction of the elastic cam respectively. The zero-return-difference harmonic gear transmission device is simple in structure, reasonable in design and convenient to implement, backlash in circular teeth can be effectively eliminated, the transmission return difference can be effectively eliminated, in addition, the torsional rigidity can be guaranteed, the service life can be long, the application range can be wide, the practicability can be high, and the popularization and application values can be high.

The invention relates to the technical field of ball screw nut pairs, in particular to a self-regulating device for a pre-tightening force of a ball screw nut pair. The self-regulating device comprises a screw, a driven screw nut, a rear wedge-shaped pushing block, a wedge-shaped jacking block, a spacer plate, a front wedge-shaped pushing block and a driving screw nut; the driven screw nut and thedriving screw nut separately sheathe the outer diameter of the screw through balls; the driven screw nut is fixedly connected with the rear wedge-shaped pushing block; the driving screw nut is fixedly connected with the front wedge-shaped pushing block; the wedge-shaped jacking block and the spacer plate are arranged between the rear wedge-shaped pushing block and the front wedge-shaped pushing block; one side of the spacer plate is connected with the driven screw nut, and the other side of the spacer plate is connected with the driving screw nut; the driving screw nut is externally connectedwith a power output end; and the driving screw nut is used for driving the driven screw nut and the wedge-shaped jacking block to rotate synchronously through the spacer plate. The front wedge-shapedpushing block, the wedge-shaped jacking block, the rear wedge-shaped pushing block and the driven screw nut are driven by the driving screw nut rotating at a high rate to rotate through the spacer plate, and therefore, the pre-tightening force is produced on the driving screw nut and the driven screw nut.

The invention discloses a damping device of an electromechanical precision drive system, comprising a fixing ring, a power output shaft and a retaining ring; the power output shaft is in running fit with the fixing ring, the retaining ring is arranged between the power output shaft and the fixing ring in a clearance fit way, a wedge groove is arranged between the power output shaft and the fixing ring and is internally provided with a damping rolling element and an elastic element, the radial size of the narrow end of the wedge groove is smaller than the diameter of the damping rolling element, one end of the retaining ring is provided with an axial open slot corresponding to the wedge groove, the damping rolling element is arranged at the narrow end of the wedge groove, the pre-tightening force direction of the elastic element is opposite to the rotating direction of the power output shaft, the power output shaft and the retaining ring are driven by a power input device to do synchronous rotation; the damping device can use self locking to overcome the interference from environment and other factors, has high driving precision, and can eliminate driving return difference to the utmost extent; furthermore, the device has no interference when running, thus being suitable for an occasion requiring high driving precision; moreover, the damping device can improve driving efficiency, reduce vibration and noise and prolong the service life of the drive system.

The invention discloses a liquid-level variable and gear variable combined high-precision measuring and metering method and a device. The device comprises three parts of a hydraulic container or cylinder liquid-level variable precise measuring and metering device, a gear variable combiner and an electronic information control device. The bottom of the large-aperture hydraulic container or cylinder provided with a piston is communicated with a small-aperture measurement pipe. The gear variable combiner is as follows: a plurality of meshed large gears and small gears are installed in a gearbox;and the gear perimeter transmission ratio is the magnifying power and the reducing power of the gear variable count. The electronic information control device comprises a computer, a controller, an infrared electronic measurement ruler and a stepping motor which are mutually and electrically connected. An output gear rack or a measurement head of the gear variable combiner and a piston connectingrod of the hydraulic container or cylinder are tightly matched with an object to be measured so that the object to be measured is located and measured accurately. The device disclosed by the invention has the advantages of high measuring and metering precision and accurate zero point location and can be widely applicable in the fields, such as numerical control machines, sighting devices, preciseinstruments, balanced pressures, standard length weights and the like. A novel measuring and metering instrument and a tool for agricultural and industrial production, national defence construction and scientific research are provided.

The invention relates to a solar energy power machine. The solar energy power machine includes a frame, a main shaft and a supporting shaft which are arranged on the frame in a cantilever mode, a rotation cylinder rotatably supported on the main shaft, a large gear arranged on the rotation cylinder, an output shaft rotatably supported on the frame, a small gear arranged on the output shaft, an open-ended heat collecting cover made of a light-transmitting material and a telescopic mechanism, wherein a suspension end of the main shaft and a suspension end of the supporting shaft are opposite, the axis of the supporting shaft and the axis of the main shaft are staggered and in parallel, the small gear and the large gear are engaged, the telescopic mechanism includes a pulley frame mounted attwo ends of the rotation cylinder, and a pulley and a tail pulley rotatably supported on the pulley frame through a pulley shaft, a bearing ring rotatably supported on the supporting shaft, and an elastic filament which bypasses the pulley and the tail pulley, and two ends of the elastic filament are respectively connected with the pulley frame and the bearing ring. The solar energy power machinehas advantages of simple transmission structure and small quantity of transmission gaps.