64results about How to "Large gear ratio" patented technology

The invention discloses a stepless speed change device and application thereof. The stepless speed change device comprises a gearbox body. The gearbox body is internally provided with a large gear and a plurality of small gears. The small gears are distributed at the periphery of the large gear in a meshed mode. One side of each small gear is meshed with a speed change rack. T-shaped grooves are formed in the gearbox body in the radial direction. The speed change racks are movably embedded in the T-shaped grooves and stretch out of the gearbox body. The tail ends of the speed change racks are provided with chain tooth discs or small belt wheels. The stepless speed change device can be applied to bicycles or the industry and is stable in speed change, easy to control, convenient to use and high in transmission efficiency.

The invention provides a power transmission apparatus for vehicle which can realize a high torque transmission efficiency and a high reduction gear ratio of a reduction gear unit with a more compact structure, and a vehicle-driving electric machinery system using the power transmission apparatus for vehicle. The power transmission apparatus for vehicle comprises a motor, a reduction gear unit for decelerating power outputted from the motor, and a differential gear unit for distributing the power decelerated by the reduction gear unit to left and right wheels. The reduction gear unit is a reduction gear mechanism including a plurality of gears mounted over a shaft which is rotatably held by a housing in a fixed position. The reduction gear unit and the differential gear unit are arranged within an area in oppositely facing relation to an axial end surface of the motor.

The invention relates to a pneumatic wheel brake for a vehicle, wherein the wheel brake has at least one brake lever (11) that can be operated by a compressed air cylinder (10) and a brake application device (20) that can be operated by the brake lever (11), wherein by means of said brake application device a first brake element (1) can be pressed against a second brake element (2) when the brake lever (11) is operated, and the wheel brake has an actuating device (3) that can be driven by an electric motor, wherein by means of said actuating device force can be applied to at least parts (7, 8, 9) of the brake application device (20), at least when the brake lever (11) is not operated, and thereby the first brake element (1) can be pressed against the second brake element (2). Furthermore, the wheel brake has a spring accumulator element (4), which is arranged outside the compressed air cylinder (10), wherein force can be applied to the spring accumulator element (4) by the actuating device (3) that can be driven by an electric motor and force can be applied to at least parts (7, 8, 9) of the brake application device (20) by the spring accumulator element, at least when the brake lever (11) is not operated, and thereby the first brake element (1) can be pressed against the second brake element (2).

The invention discloses a transmission gear system of a motor vehicle. The system comprises a drive motor; a drive gear is arranged on a drive shaft of the drive motor; an external gear is arranged on a wheel and around an axle; an internal gear is arranged on the wheel and at the periphery of the external gear; the drive gear drives the internal gear or the external gear; and the internal gear or the external gear drives the wheel to rotate. Since the transmission gear system of the motor vehicle is provided with the smaller-diameter external gear and the larger-diameter internal gear, the internal gear and the external gear are arranged on the wheel, and the wheel has larger diameter, so that the internal gear conditionally has the diameter greater than that of the external gear, a larger gear ratio can be generated when the drive gear drives the wheel by the internal gear or the external gear respectively, and the purpose of substantially regulating variable speed is achieved. Moreover, the system, which is provided with the internal gear and the external gear, is simple in structure and low in cost, so that the cost performance of a product is greatly improved.

A vehicle power transmission device in which a continuously variable transmission for continuously changing the transmission gear ratio, and a gear train are disposed between an input shaft to which the torque outputted from a drive power source is inputted and the output shaft which outputs the torque such that the torque can be transmitted between the input shaft and the output shaft, the gear train having a middle shaft disposed on a position that is different from the input shaft and the output shaft and setting at least one transmission gear ratio that cannot be set by the continuously variable transmission, wherein: a forward / reverse switching mechanism for carrying out a differential action by means of three rotating elements is disposed along the same axial line as the output shaft or the middle shaft, the three rotating element being an input element, an output element, and a reaction element for rotating the input element and the output element in the opposite direction from one another as a consequence of the rotation of the reaction element being stopped; a first clutch mechanism for connecting at least two of the three rotating elements and a brake mechanism for stopping the rotation of the reaction element are provided; the input shaft and the output shaft are in communication with one another via the continuously variable transmission; a second clutch mechanism for transmitting and blocking the torque is disposed on a torque transmission path extending from the input shaft to the continuously variable transmission and finally to the output shaft; and the input shaft and the output shaft are in communication with one another via the gear train and the forward / reverse switching mechanism.

A foot-controlled gear of bicycle is coaxially installed on the chain wheel axle. It consists of a quick gear, a slow gear, and a switching sleeve. The quick gear and slow gear is equipped with inner spline. The chain wheel is engaged with the quick gear at end surfaces. A servo-gear is installed below the chain wheel to engaged with the quick gear and the slow gear. An energy-storing spring and a gear-linking bar are used for the mechanism to change speed by pedaling in an opposite direction of rotation. The gear omits a gear cable, works reliably, changes speed easily, and is installed simply.

The invention provides a movable teeth quasi-stepless speed change device, comprising a metal band, a driving shaft and a driven shaft, wherein, the driving shaft and the driven shaft are respectivelyinstalled with a fixed cone disc and a corresponding removable cone disc; the cone disc is provided with two to three groups of equant dovetail grooves which are vertical to the rotating direction; the fixed cone disc and the dovetail grooves on the removable cone disc correspond mutually; more than two movable teeth bodies constitute a movable teeth base; the movable teeth body is provided withdovetail blocks and teeth; the dovetail blocks on the movable teeth body are embedded into dovetail grooves; and when the fixed cone disc and the removable cone disc approach or separate, the two to three groups of equant movable teeth bases glide radially in an equal radius, thus changing the working radius of the movable teeth base, achieving the purpose of speed change, changing the friction transmission to gear transmission, and greatly improving the transmission power, the torsion and the mechanical efficiency. The invention also provides a novel structure of mechanical automatic pressurizing and speed adjusting to substitute the common hydraulic pressurizing system.

The invention discloses a double-cone-wheel transmission based on a bicycle chain rotating mechanical device. The double-cone-wheel transmission mainly comprises an active chain wheel driven by foot rest levers, a passive chain wheel, a sliding chain axle, a driving chain wheel, an internal chain, a speed-changing chain jumping mechanism and the like. According to the double-cone-wheel transmission, the number of chain discs of the active chain wheel is one larger than that of chain discs of the passive chain wheel, the passive chain wheel can transversely move back and forth on the passive axle by a chain disc interval under the action of a passive wheel transverse shifting fork, each passive chain wheel tooth disc is only meshed with two corresponding active chain wheel tooth discs, the internal chain can be connected with one of any two active chain wheel tooth discs on a rotating plane of a tooth disc of the passive chain wheel under the action of chain jumping mechanism, and therefore the number of steps of speeds can be twice that of the number of the passive chain wheel discs. According to the double-cone-wheel transmission, the thickness of the bicycle transmission and the diameters of the chain wheels are effectively decreased, and multi-step uniform speed changing can be achieved within a small space and under the action of a small number of parts.

Parallel shafting gearbox have problems like the frictional losses, gear shifting is very hard under load, wear and tear of gears while shifting and operating of the gears, load distribution on single driven gear and it is hard to derive large reductions gear ratio easily. Present invention introduces a gearbox as a solution for above problems using PGTU (planetary gear trains unit)s such that all the PGTUs in gear box are connected serially with axles on which planetary gears are mounted, of the PGTUs which are arranged between them, forming a series of CPCAs, for transmission from rotating driving shaft on which sun gears are mounted to the driven shaft by braking the motion of the ring gear of PGTU through which the transmission is to be carried out while setting free the ring gears of rest of the PGTUs in the gear box, It is useful in automobile vehicle etc.

The invention provides a transmission providing a gear ratio between an input shaft and an output shaft. The transmission comprises an annulus ring, a sun wheel being rotatable around a central axis of the transmission, a planet carrier being rotatable around the central axis of the transmission, and a set of planet wheels, each wheel comprising a plurality of wheel segments with different diameters, the planet wheels being fixed in rotational bearings of the planet carrier and being arranged to rotate epicyclically around the central axis. The annulus ring and the sun wheel each interacts with one of the wheel segments e.g. via meshing toothed gear wheels. The gear facilitates various interaction means at different locations in the gear, and thus facilitates a potentially less noisy, lighter, smaller or stronger gear by use of a low amount of components.

A group transmission of a motor vehicle having a main transmission and a downstream range group. The range group has two gear steps for different speed ranges and a reversing step for reverse driving. The range group has two planetary gearsets, each with a planet carrier, a sun and ring gears. To engage a driving range for lower speeds, the sun gear of the second gearset and the ring gear of the first gearset are locked to the housing by a first clutch. To engage a driving range for higher speeds, two respective elements of the two gearsets can be connected to one another, in a rotationally fixed manner, by a second clutch. To engage a reversing driving range, the planet carrier of the first gearset and the ring gear of the second gearset are locked relative to the housing by a third clutch.

Wind turbine comprising a nacelle with a generator and wind turbine blades for driving the generator, a tower supporting the nacelle wherein the nacelle is rotatable about a vertical axis an azimuth drive for rotating the nacelle around the axis, said azimuth drive comprising a plurality of asynchronous yaw motors and an azimuth controller with a frequency unit for controlling the plurality of asynchronous yaw motors, wherein the azimuth controller is arranged to connect all of the plurality of asynchronous yaw motors to the one frequency unit in a rotating mode and to connect only a subset of the plurality of asynchronous yaw motors from the one frequency unit in a locking mode.