101 results about "Trochoid" patented technology

The invention relates to a micro-milling-force modeling method based on a tool abrasion effect and belongs to the field of precision and efficient machining of micro-parts. The method comprises the steps that the influence of tool tooth top trochoid motion trail, radial run-out of tooth tops, elastic recovery of machined surfaces and other factors is comprehensively considered to obtain a micro-milling-force prediction model which is not based on tool abrasion; then, the tool abrasion situation in the micro-milling process is obtained based on a finite element method, and the positive pressure and tangential friction force produced due to the fact that tool abrasion causes that the rear tool surface extrudes a workpiece are calculated based on a simulation result; finally, models of the two forces are superposed to obtain the micro-milling-force modeling method based on tool abrasion. The micro-milling-force modeling method achieves accurate micro-milling-force prediction through one model, improves the model robustness, is wide in application range and improves the micro-milling machining quality and efficiency of the micro-parts.

A kind of block for building wall and the wall built with said blocks. There are many analogous blocks laid to overlap and stagger with upper / nether block continuously in said wall. The block extends lengthways and comprises top surface (1), bottom surface (2) and two end surfaces (3); the cross section thereof on the whole is a converse trumpet shape; the top surface (1) has a mid ridge (4) higher than the two sides of the surface so as to form the left / right supporting slope (5); the top surface (1) and the bottom surface (2) are formed in this way: when a block overlap with a analogous block thereunder to form a wall, the left and right supporting slope (5) become a blocking structure to lock the two blocks neighbored up and down, the raised dimension of the mid ridge (4) can cut off space-time trochoid. This invention also provides the assistant blocks, which cooperate with said blocks when building wall.

A hermetic compressor uses an oil pump that includes a trochoid gear. Therefore, regardless of the rotation speed of a driving motor of the compressor, a sufficient amount of oil can always be pumped. The oil pump unit may include a plurality of suction holes with openings at different heights. If the refrigerant and oil separate, at least one of the openings will admit oil into the oil pump unit, to ensure lubricating oil is supplied to the moving parts of the compressor.

The present invention relates to a magnetic field induction type game rod. It includes the following several portions: a control rod, a spring, a spring base, a base seat, a trochoid, a bearing plate and a magnetic field induction module. Said invention also provides the connection mode of all above-mentioned portion, and also provides the working principle of said magnetic field induction type game rod and its concrete operation method.

A steering system includes a hydraulic power cylinder 5 that assists a steering force of a rack-and-pinion mechanism 4, and a first hydraulic pressure supply mechanism 8 having a first trochoid pump 23 selectively supplying hydraulic pressure to two hydraulic pressure chambers 15a and 15b of the hydraulic power cylinder via first and second fluid passages 6 and 7, and a first electric motor 24 for the first trochoid pump. When the first hydraulic pressure supply mechanism becomes failed, a second hydraulic pressure supply mechanism 11 is operated responsively to a command signal from a control unit 14 to selectively supply hydraulic pressure via third and fourth fluid passages to either one of the hydraulic pressure chambers.Thus, it is possible to positively apply a steering assist force by means of the second hydraulic pressure supply mechanism 11, thereby reducing a driver's operating force applied to a steering wheel.

In an angular position adjusting apparatus, tooth profiles of an internal gear 31 and an external gear 21 are formed according to loop shapes 74a and 84a of predetermined trochoid curves 74 and 84.

The invention discloses a fine milling cutting force simulation predicting method considering the tool runout influence. Aiming at micro-milling cutter cutting edge trochoid motion track calculation, on the basis of a tool coordinate system and a machining process geometric model, tool axis radial deviation and tool axis inclination are fully considered, and theoretical instant non-deformation chip thickness models are established for cutting edges at different positions based on an actual tool trochoid motion track; and cutting force prediction models are established in a shear effect leading cutting region and a plough effect leading cutting region separately based on a micro-milling cutter side edge shear effect, a micro-milling cutter side edge plough effect and a micro-milling cutter bottom cutting effect. The influences of tool runout, a cutting edge size effect and a bottom edge cutting effect are fully considered, and strong support is provided for reasonable optimization of cutting machining parameters while the cutting force prediction precision in the fine milling process is improved.

A transmission gear has a tooth surface formed of a free-form surface instead of an involute surface and a root area formed of a free-form surface instead of a trochoid surface. With such a transmission gear, the fatigue strength against contact pressure can be increased by reducing the Hertzian stress in the area around the meshing point of the tooth surface. The tooth surface is formed of a free-form surface in which the smallest radius of curvature in an area around a mating pitch point is maximized, and the fatigue strength against bending can be increased by reducing the bending stress at a tooth root portion of the bottom land. In addition, the gear noise can be reduced. The bottom land is formed of a free-form surface in which the smallest radius of curvature in an area around a tooth root is maximized.

The invention relates to an anti-backlash transmission comprising trochoid gears and roll pins with conical teeth, and belongs to the technical field of mechanical transmission. The anti-backlash transmission mainly comprises a pin gear and a trochoid rack, and a rack pair consisting of the pin gear and the trochoid rack realizes movement transmission. Working tooth profiles of teeth of the trochoid rack are flat trochoid internal equidistant lines, and each tooth has a certain conical degree along the tooth width direction. The pin gear meshed with the trochoid rack is provided with a plurality of roll pins, and conical degrees of the roll pins are identical to a conical degree of the rack. The anti-backlash transmission has the advantages that the anti-backlash transmission is good in interchangeability, low in maintenance cost, high in transmission precision and long in service life, backlash is prevented in a meshing procedure, tooth gaps caused by abrasion in a transmission procedure can be compensated, smooth transition between clockwise rotation and anticlockwise rotation can be realized, and the like.

An improved chain drive mechanism having a closed loop of roller chain passing round the opposite sprocket wheels. The profile of each tooth formed on the circumference of the sprocket wheel is in conformity with the envelope curve traced by a roller when the roller moves with its center following an involute-trochoid curve. The involute-trochoid curve is determined by offsetting the roller pitch line a certain distance apart outside the contact pitch line, and by rotating the contact pitch line on the base circle of the sprocket wheel to allow a point on the roller pitch line to trace a curve. The certain distance is so determined that the roller pitch may be equal to the incremental arc length, which is determined by dividing the circumference of the base circle by the number of teeth.

A tandem type trochoid pump is comprised of a drive shaft having a non-circular end portion, a spacer positioned between a first trochoid pump and a second trochoid pump in a housing body, a first fixing portion for fixing a first inner rotor of the first trochoid pump to the drive shaft in a rotational direction, and a second fixing portion for fixing a second inner rotor of the second trochoid pump to the drive shaft in the rotational direction.

A circular disc shape case 11 includes a motor rotor chamber 12, a bearing chamber 13 and a gear chamber 14 piled sequentially and being communicated with each other. A suction port 15 is connected to the motor rotor chamber 12, and a discharge port 16 is connected to the gear chamber 14, which communicate with outside respectively. A rotating shaft 18 having an end positioned in the motor rotor chamber 13 and the other end extending to the gear chamber 14. A rotor 22 is fixed around the rotation shaft 18 in the motor rotor chamber 13. A first bearing 19 is provided for supporting the end of the rotating shaft 18 in radial and thrust directions. A second bearing 20 is provided in the bearing chamber 13 for supporting an intermediate portion of the rotating shaft 18 in radial direction. A trochoid gear 25 is provided in the gear chamber 14, having an outer rotor 26 and an inner rotor 27, which functions as a pump, taking in a fluid through the suction port pipe 15, and discharging the fluid from the discharge port 16.

Disclosed is a power-transmitting apparatus. A power-transmitting apparatus of the present invention comprises: a pin gear provided with a plurality of pins capable of rolling movement; and a spur gear provided with a plurality of teeth and en-gagingly coupled to the pin gear so as to be relatively movable, wherein the spur gear teeth are formed with a cycloid tooth shape, and a polygonal tooth root space is formed at a tooth root region of the spur gear. As compared to a trochoid tooth shape, the tooth shape of the spur gear engagingly coupled to the pin gear so as to be relatively movable according to the present invention has a greater tooth size so that it can be applied as a cycloid tooth shape capable of maintaining a sufficient tooth contact ratio, and can resolve a reduction in tooth thickness and the wedging of the pins from an undercut at the tooth root region.

A tandem type trochoid pump is comprised of a drive shaft having a non-circular end portion, a spacer portioning a first trochoid pump and a second trochoid pump in a housing body, a first fixing portion for fixing a first inner rotor of the first trochoid pump to the drive shaft in rotational direction, and a second fixing portion for fixing a second inner rotor of the second trochoid pump to the drive shaft in rotational direction.

An engine lubrication and speed control method is provided. The four-cycle engine has a lightweight aluminum alloy engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A vertical or horizontal crankshaft is rotatably mounted in the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod. A trochoid or screw oil pump is driven by the camshaft connected with a cam gear, which mates with a crank gear that is driven by the crankshaft, inhales the oil from the oil reservoir to splash lubricate into the cylinder bore and valve chamber. The engine is provided with a cylinder head assembly defining a compact combustion chamber having a pair of overhead intake and exhaust ports and cooperating intake and exhaust valves. A commonality of parts between the horizontal and the vertical engine is highly achieved.

The invention discloses a prediction model for a turning and milling spatial spiral trochoid motion trail and an instantaneous cutting force, and belongs to the technical field of machining and manufacturing. The establishment process of the instantaneous cutting force prediction model is as follows: firstly, establishing a tool coordinate system and a workpiece coordinate system, secondly, establishing a space spiral trochoid motion track model; thirdly, establishing a single-tooth circumferential blade cutting angle and cutting angle model; fourthly, establishing a model of the cutting thickness and the cutting width of the single-tooth circumferential edge; and finally, establishing a theoretical orthogonal turn milling instantaneous cutting force model. The method can truly reflect the cutting motion track of the tool nose, and solves the problem of the motion track of the turn milling combined machining tool tooth.

It is an object of the present invention to provide a trochoid type oil pump in which erosion of the rotor surfaces caused by cavitation is minimized, vibration and noise are reduced, and the structure is greatly simplified. The trochoid type oil pump of the present invention comprises a rotor chamber which has an intake port and a discharge port, an outer rotor, an inner rotor, and shallow grooves which are formed on the side of the initial end portion of the discharge port on the circular circumference of the track of the positions of the bottom portions of the teeth created by the rotation of the outer rotor. In a state in which the sealed spaces formed by the outer rotor, the inner rotor and a partition part between the final end portion of the intake port and the initial end portion of the discharge port are reduced in volume from the maximum volume, the sealed spaces Sa are caused to communicate with the shallow grooves.

A trochoid pump for supplying hydraulic fluid to a power cylinder in a power steering system. The trochoid pump includes a housing formed therein with an annular operating chamber. Outer rotor having internal teeth and inner rotor having external teeth are rotatably accommodated in the operating chamber in such a manner that the internal and external teeth are engageable with each other. A driving shaft is provided for rotationally driving the inner rotor. A low pressure passage is opened to a clearance between an outer peripheral surface of the outer rotor and an inner peripheral surface of the operating chamber within a discharge region at side of an engaging section at which the volume of the pump chamber is the minimum so as to release a high pressure applied to the outer peripheral surface of the outer rotor, to a low pressure side.

An electrically driven rotary piston machine which operates as a rotary piston pump or rotary piston compressor wherein the rotary piston machine has a basic housing, which holds an electrical coil and pump head, wherein the pump working space is preferably bounded by a trochoid toothing of the rotors. The pump head which can usually be manufactured relatively economically is embodied as a disposable part and therefore has a quick-action connection with the more complex basic housing.

A two-stage epicyclic roller cam transmission comprising in each stage: a roller ring having a plurality of fixed-position rollers; and a cam gear having pitch-circle-generated, trochoid-shaped teeth and independent pitch, wherein the rollers are spaced to mesh with the cam gear and efficiently transfer energy under heavy loads.

The invention relates to an anti-backlash transmission comprising trochoid gears and roll pins with conical teeth. The transmission has two transmission modes, and a pin gear is respectively externally meshed and internally meshed with the corresponding trochoid gears to implement the two transmission modes. The pin gear is provided with a plurality of conical roll pins, and tooth gaps are eliminated by axially pushing the pin gear along the end, which is provided with a small diameter, in a transmission procedure; and the trochoid gears are conical trochoid gears, and the trochoid gears and the pins are meshed to realize zero-backlash power transmission. The pin gear or the trochoid gears is driven by a servo motor to continuously relate, and accordingly a deceleration function or an acceleration function is realized. The anti-backlash transmission is simple in structure, requirements on high-speed and high-precision transmission are met, the tooth gaps generated by abrasion during transmission can be eliminated, the meshing accuracy is guaranteed, and the utilization rate of the roll pins is increased.

In an angular position adjusting apparatus, tooth profiles of an internal gear 31 and an external gear 21 are formed according to loop shapes 74a and 84a of predetermined trochoid curves 74 and 84.

A trochoid oil pump, which enables the endurance to be increased and the reduction of discharge pulsations and noise to be achieved, and in which those results can be realized with a very simple structure. An interdental space constituted by an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile starts a compression stroke in the location of a partition section between an intake port and a discharge portion, and a linking gap L is composed by the interdental space and a preceding adjacent interdental space realized in a discharge stroke. The linking gap expands gradually from the start of compression stroke to the discharge stroke.

A trochoid pump for supplying hydraulic fluid to a power cylinder in a power steering system. The trochoid pump includes a housing formed therein with an annular operating chamber. Outer rotor having internal teeth and inner rotor having external teeth are rotatably accommodated in the operating chamber in such a manner that the internal and external teeth are engageable with each other. A driving shaft is provided for rotationally driving the inner rotor. A low pressure passage is opened to a clearance between an outer peripheral surface of the outer rotor and an inner peripheral surface of the operating chamber within a discharge region at side of an engaging section at which the volume of the pump chamber is the minimum so as to release a high pressure applied to the outer peripheral surface of the outer rotor, to a low pressure side.

To provide a trochoid type oil pump materializing improvement of durability and reduction of delivery pulsation and noise with a very simple structure. In this oil pump, a space S between teeth composed by an inner rotor 5 including trochoid teeth or roughly trochoid shape teeth starts compression stroke P3at four section of partition part 4 between an intake port 2 and a delivery port 3, a communication gap J with preceding adjoining space S between teeth in delivery stroke P4is constructed in the space S between the teeth. The communication gap J gradually expands from start of compression stroke P3to delivery stroke P4.