190results about How to "Transmission ratio is small" patented technology

The invention discloses a light five-cylinder plunger pump. The light five-cylinder plunger pump comprises a power end assembly and a hydraulic end assembly, wherein the power end assembly is connected with the hydraulic end assembly; the cylinder spacing of the light five-cylinder plunger pump is 9in; the power end assembly comprises a crank shaft, the crank shaft comprises six crank necks and five crank throws, the crank necks and the crank throws are fixedly connected, the distance between rotating centers of the crank necks and the crank throws is 101.6 mm, and the stroke distance of the light five-cylinder plunger pump is 203.2 mm. According to the light five-cylinder plunger pump, power is increased by increasing stroke, reducing transmission ratio and improving bearing capacity, andmeanwhile, dead weight is reduced by reducing the cylinder spacing, the tooth number of a big gear and the tooth thickness of the big gear and a pinion. The light five-cylinder plunger pump meets conditions of working in the area with severe well cementing operation conditions in aspects of weight and power simultaneously, and working efficiency is increased.

The invention discloses a gear-shifting control method for an automatic hydraulic speed changer. The gear-shifting control method comprises the steps that in the one-time gear shifting process, only one clutch is started, the other clutch is combined, the torque exchanging process is carried out between the two movement clutches, oil pressure is controlled through the combination of the clutch controlling step and the separated clutch controlling step, and the flexible clutch combination is guaranteed by adjusting the K1 and K2 control pressure in the gear shifting process. The engine torque changing is controlled, and easy, efficient and smooth gear shifting controlling of the automatic hydraulic speed changer is achieved. The test carried out under the full accelerator aperture and other limiting conditions such as gear lifting and gear jumping and reducing in a low-gear gear area shows that the control method can meet the requirements for gear shifting quality of forward torque gear lifting, forward torque gear reducing, negative torque gear lifting and negative toque gear reducing.

The invention relates to a transition gear and a transition gear train, aiming at providing the simple, practical and high-efficiency gear and the gear train used as a force conversion system for a reciprocating piston type heat engine. The transition gear is an incomplete gear with deformed tooth profile, and the tooth profile is deformed so that the transition gear can be the one with close contact and repeatedly changed speed direction and speed degree to form a gear pair. The transition gear train at least comprises one transition gear. In the rack transition gear train, the transition rack is in close contact with the tooth profile of the transition gear to make equidirectional or reversed motion or to be stationary so that the rack moving in a reciprocating manner can transfer the motion to the transition gear without rigid compact and the pushing force of fuel gas can be redistributed to drive a crankshaft to rotate.

The invention relates to an electric power-assisted steering system with a variable transmission ratio and a method for controlling transmission ratio thereof, and belongs to an electric power-assisted steering system. A planetary gear mechanism and a steering motor are arranged between a torque sensor and a gear rack; and on the basis of completing the conventional electric power-assisted steering, the electric power-assisted steering system can realize the functions of variable transmission ratio control and active steering interference.

A transmission mechanism with a pair of selectively engageable clutch systems is disclosed that has an upstream gear ratio and a downstream gear ratio that combine to provide an effective gear ratio. A different clutch drive member (42,44) is associated with an input side of each of the pair of clutch systems. The clutch drive members are driven for rotation by an engine input member (26). The upstream gear ratio is determined by the gear ratio between the engine input member and one of the clutch drive members. Output sides of each of the clutch systems drive an associated one of a pair of non-coaxial layshafts (20,22). Pinions are located on and selectively driven by the layshafts. A countershaft (50) is spaced from both of the layshafts, and has a plurality of gears. Each of the gears is driven for rotation by one of the pinions of the layshafts. The downstream gear ratio is determined by the gear ratio between the selected pinion and the intermeshed gear.

The invention provides a transmission, a driving system with the transmission, and a control method for the driving system. The transmission comprises a first shaft, a first clutch, a second clutch, a planetary gear mechanism and a second shaft which are coaxial, wherein the planetary gear mechanism comprises a sun gear, a gear ring, a planetary gear and a planetary carrier; the planetary gear can rotate on the planetary carrier and rotate around the sun gear and the gear ring; a driving disc of the first clutch, the first shaft and the gear ring are integrally arranged; the sun gear and a driven disc of the second clutch are integrally arranged; and the planetary carrier, a driven disc of the first clutch and the second shaft are integrally arranged. Through the arrangement, a multi-shaft design is avoided, the number of gears is reduced, the design, manufacturing and assembly of a transmission system are greatly simplified through a group of planetary gear mechanism and a few clutches, cost is reduced, the total weight of equipment is reduced, and the requirement on driving devices such as a motor and an engine is reduced.

The invention relates to an obstacle-crossing carbon-free trolley running in an S-shaped mode. A wire wheel support 3 and a secondary fixed pulley 1 are mounted on a potential energy support 4 through a wire wheel shaft 14. A front wheel 7 is mounted on a front wheel support 6 through a front wheel steering shaft. A driving wheel 20, a driven wheel 11 and a pinion 12 are mounted on a driving shaft 16. A bull gear 13 and a small belt pulley 17 are mounted on a bobbin 14. A large belt pulley 18 is mounted on a shaft connected to a crank connecting rod 9. The pinion 12 is engaged with the bull gear 13. The small belt pulley 17 is connected to the larger belt pulley 18 through a belt 19. One end of a rope 22 is connected to a potential energy block 2, the rope 22 bypasses the secondary fixed pulley 1 and is wound in a wire winding groove 15, and the other end of the rope 22 is positioned through a wire hole in the secondary fixed pulley 1. According to the invention, the potential energy generated by the falling of the potential energy block is converted into the kinetic energy of the trolley, the trolley can periodically avoid obstacles from a long distance based on a preset track and through gear engaging and belt transmission, and the trolley is simple in structure and convenient to use.

The invention discloses a variant wheel type walking device capable of realizing wheel-track switching, which comprises a main shaft, a spoke assembly, a rim assembly, a conversion and tensioning mechanism and a switchable transmission mechanism, wherein the spoke assembly is mounted on the main shaft, the rim assembly is connected to the spoke assembly, a crawler belt is mounted on the outer ringof the rim assembly through a plurality of bearing wheel sets, the conversion and tensioning mechanism can drive the rim assembly to rotate and deform so as to enable the section shape of the crawlerbelt to be converted between a round shape and a triangular shape, the crawler belt is tensioned, the switchable transmission mechanism can transmit rotation of the main shaft when the section shapeof the crawler belt is the round shape and the triangular shape, and thus the device is driven to walk. According to the invention, the existing variant wheel type walking device is improved from multiple aspects, various defects of the existing variant wheel type walking device are overcome, and actual use requirements are met.

The present invention relates to a drivetrain for a motor vehicle, compries an electric machine which can be operated in a generator mode and a starter mode; a planetary gear set, of which a first element, which forms the drive input side of the planetary gear set in the generator mode and forms the drive output side of the planetary gear set in the starter mode, is in rotationally driving connection with the engine shaft, a second element, which forms the drive output side of the planetary gear set in the generator mode and forms the drive input side of the planetary gear set in the starter mode, is in rotationally driving connection with the rotor, and a third element, which can be fixed by means of a first actuating device to a stationary housing in the starter mode, with a second actuating device also being provided which, in the generator mode, interacts with at least one of the elements in such a way that the planetary gear set performs a block rotation. The planetary gear set is arranged in front of the engine in the first axial direction, while the transmission is arranged behind the engine in the first axial direction.

The invention discloses a two-phase outer cam sleeve type high-rotational-speed internal-combustion engine, and relates to the field of power of fuel gas. The invention provides a novel internal-combustion engine. Eight cylinders are annularly, symmetrically and uniformly distributed around an outwards convex inner gear ring, so that resultant force from which the outwards convex inner gear ring is suffered is zero; pistons of the cylinders directly act on the outwards convex inner gear ring through push rods; and power is transferred to an output shaft connected with a symmetric two-phase cam through a key by the outwards convex inner gear ring through the drive of a two-phase outer cam type sleeve oscillating tooth. By using the internal-combustion engine, a connecting rod and a crankshaft in a conventional internal-combustion engine are omitted; a two-phase outer cam sleeve driving mechanism of the outwards convex inner gear ring of the internal-combustion engine does not have an eccentric mass; the internal-combustion engine has the characteristic of the self balancing of inertia force and a working load; the rotational speed of the output shaft depends on the drive ratio of the drive of the oscillating tooth; if a dowel pin frame is fixedly arranged, the symmetric two-phase cam carries out output at a high speed; the internal-combustion engine can be widely applied to the field of high rotational speeds, such as engines of helicopters, and miniature engines; and when an output rotational speed is constant, the emission of harmful gas can be reduced. The internal-combustion engine is simple and compact in structure, small in axial dimension and self-balancing in stress, and is stable to run.

The invention discloses a planetary roller screw mechanism, an automobile hydraulic separation system and an automobile. The planetary roller screw mechanism comprises a lead screw (1), rollers (2) and a nut (3). The rollers (2) are ring tooth rollers, and comprise large diameter sections (21) and small diameter sections. The large diameter sections mesh with the lead screw (1), and the small diameter sections mesh with the nut (3). The tooth pitch of the large diameter sections (21) of the rollers (2) is consistent with the screw pitch of the lead screw (1), and the distance A between the tooth portions of the same number of ring and the end portion reference surface of the large diameter sections (21) of the rollers (2) is sequentially increased in the order of the circumferential direction and the difference is equal. The planetary roller screw mechanism can significantly reduce the machining difficulty and manufacturing cost, has higher bearing capacity and rigidity and longer service life, and can further reduce the transmission ratio of the planetary roller screw, thereby reducing the torque and power requirements on a motor matched with the lead screw and reducing the size of the motor.

The invention provides a hybrid power loader energy recovery and recycling system and a control strategy thereof. According to the system, the output end of an engine is connected with a steering oilpump and a working oil pump through a normally engaged gear, and is also connected with a first clutch and a transfer case through the normally engaged gear; the transfer case is connected with a front transmission shaft and a front drive axle through the first output end of a torque coupler, and is connected with a second clutch and a variable hydraulic pump / motor through the second output end ofthe torque coupler; one end of the variable hydraulic pump / motor is connected with a low-pressure oil tank, and the other end of the variable hydraulic pump / motor is sequentially connected with an energy control valve group and a high-pressure energy accumulator; and one ends of the steering oil pump and the working oil pump are connected with the low-pressure oil tank, and the other ends of thesteering oil pump and the working oil pump are connected with the energy control valve group. According to the system, the recovery of the potential energy of a movable arm and the braking energy canbe realized through an energy control valve group system, and the steering oil pump and the working oil pump actively charges the energy when a loader runs at a low load and the engine works at an idle speed. The system and the control strategy thereof have the advantages of high energy recovery and utilization rate, high system efficiency and sensitive response of the energy control valve group.

The invention discloses an electric drive power assisted steering system capable of performing drive ratio variation control by a motor and a control method thereof. The invention relates to an electric drive power assisted steering system. The steering system comprises a steering wheel, a rack connected with the steering wheel by a steering column, a torque sensor positioned below the steering wheel, a power assisted motor connected with the rack by a reducing mechanism, a steering arm connected with the rack, and an electronic control unit (ECU). The steering system is characterized in that: the steering servo motor is arranged on the steering column between the torque sensor and the rack; and a stator and a rotor of the steering servo motor are respectively connected with the torque sensor and the steering column arranged above the gear rack. The invention is capable of realizing the functions of power assisted steering and active steering, and realizing the perfect integration of vehicle safety and mobility.

The invention discloses an automatic steering wheel control device, and belongs to the technical field of engineering machinery. The automatic steering wheel control device comprises an intermediate shaft (1), a motor (2), a first transmission mechanism (3), a second transmission mechanism (4) and an electromagnetic clutch (5). The intermediate shaft (1) is arranged on a side of a steering wheel shaft (9), the motor (2) is positioned on a side of the intermediate shaft (1), the intermediate shaft (1) is connected with the motor (2) by the first transmission mechanism (3) and is connected withthe steering wheel shaft (9) by the second transmission mechanism (4), and the first transmission mechanism (3) is connected with the intermediate shaft (1) by the electromagnetic clutch (5); the intermediate shaft (1) can be driven by the motor (2) via the first transmission mechanism (3) and the electromagnetic clutch (5) to rotate, and the steering wheel shaft (9) can be driven by the intermediate shaft (1) via the second transmission mechanism (4) to rotate. The automatic steering wheel control device has the advantages that the transmission ratio can be increased by the automatic steeringwheel control device, high torque can be outputted, automatic steering wheel control and manual control can be flexibly switched over without mutual interference, the automatic steering wheel controldevice is compact in structure, only small mounting spaces are required, and the like.

The invention discloses an automobile and a speed changer thereof. The speed changer comprises a shell, an input shaft, a Ravigneaux planet gear mechanism, and first and second single-row and single-stage planet gear mechanisms, wherein the first single-row and single-stage planet gear mechanism comprise a first sun gear, a first planet gear, a first planet carrier and a first inner gear which are sleeved on the input shaft; the Ravigneaux planet gear mechanism comprises a larger sun gear, a smaller sun gear, a longer planet gear, a shorter planet gear, a planet carrier and an inner gear ring; the larger and smaller sun gears, the first inner gear ring, the planet carrier are connected separably with the input shaft; the second single-row and single-stage planet gear mechanism comprises a second sun gear, a second planet gear, a second planet carrier, a second inner gear ring, a first brake, a second brake and a third brake; the second inner gear ring is connected with the input shaft; the second planet carrier is fixed on the planet carrier; the first brake is used for braking the larger sun gear; the second brake is used for braking the planet carrier; and the third brake is used for braking the second sung gear. According to the speed changer, seven forward gears are designed; and the speed changer is simple in structure, and has high shifting efficiency.

The invention discloses an automatic gearbox which comprises an input shaft, a first planetary gear mechanism, a second planetary gear mechanism, a third planetary gear mechanism, an output shaft, a first clutch, a second clutch, a third clutch, a fourth clutch and a second brake. A first gear ring is connected with the input shaft, a first planetary frame is fixedly connected with a gearbox shell, a second planetary frame is fixedly connected with a third planetary frame, the output shaft is fixedly connected with a second gear ring and a third gear ring and parallel to the input shaft, the first clutch is freely connected with the input shaft and a third sun gear, the second clutch is freely connected with the input shaft and a second sun gear, the third clutch is freely connected with a first sun gear and the second sun gear, the fourth clutch is freely connected with the first sun gear and the second planetary frame, the second planetary frame is freely fixed to the gearbox shell by the aid of the second brake, and transmission gears are determined according to the connecting state of two fastening mechanisms. The automatic gearbox is more compact in structure and wider in speed ratio range, and is provided with more gears and at most provided with twelve forward gears and one reverse gear.

The invention relates to the technical field of plastic machining, and particularly discloses plastic sheet polishing equipment. The plastic sheet polishing equipment comprises a machine frame and a working table, a first sliding plate is horizontally connected to the working table in a sliding manner, the first sliding plate is provided with a mechanism used for clamping plastic sheets, a secondsliding plate is in sliding connection to the machine frame and is connected with a motor, a rotating shaft is connected with the output end of the motor, a first gear and a polishing wheel used for polishing the plastic sheets are coaxially and fixedly connected to the rotating shaft, a vent pipe is rotationally connected to the polishing wheel, a channel is formed in the polishing wheel and is used for communicating the surface of the outer circumference of the polishing wheel and the vent pipe, and a plurality of fan blades are coaxially installed on the rotating shaft and are located in the vent pipe; and a first rack meshed with the first gear is connected to the machine frame, a second rack is arranged on the first sliding plate, a second gear is meshed with the second rack, and thefirst gear can be meshed with the second gear after the first gear and the first rack are meshed. By means of the plastic sheet polishing equipment, the plastic sheets can be polished, and dust generated during polishing can be treated in time.

The invention provides a two-phase outer cam shock wave rolling transmission internal combustion engine and relates to the field of gas power. According to the novel internal combustion engine, eight cylinders are annularly symmetrically evenly distributed around a convex inner tooth ring, the resultant force which the convex inner tooth ring is subjected to is zero, and a cylinder piston directly acts on the convex inner tooth ring through a push rod, power is transmitted to an output shaft connected with a two-phase outer cam key by two-phase outer cam shock wave rolling oscillating tooth transmission through the convex inner tooth ring. According to the internal combustion engine, a connecting rod and a crankshaft in a traditional internal combustion engine are not required, a convex inner two-phase shock wave rolling transmission mechanism does not have eccentric mass and has the advantages of self balancing of inertia force and working load, and the rotating speed of the output shaft depends on the transmission ratio of oscillating tooth transmission. If an oscillating tooth brace is fixed, a two-phase outer cam performs high-speed output and can be widely applied to the fields requiring for high rotating speeds, such as helicopter engines and small generators, and discharge of harmful gas can be reduced when the output rotating speed is fixed. The internal combustion engine is simple and compact in structure, small in axial dimensions self-balancing in stress and runs stably.

The invention provides a pulley transmission, which comprises a pulley component mounted on a shaft. The pulley component comprises a core pulley, a first disc conveying belt, a second disc conveying belt and a pulley section group, the first disc conveying belt and the second disc conveying belt are located on opposite sides of the core pulley and are separated by the core pulley, the pulley section group comprises a first pulley section subgroup supported by the first disc conveying belt and a second pulley section subgroup supported by the second disc conveying belt, pulley sections of the first pulley section subgroup can slide towards the second disc conveying belt from non-joint states to joint states, pulley sections of the second pulley section subgroup can slide towards the first disc conveying belt from non-joint states to joint states, and the pulley sections of the first pulley section subgroup and the pulley sections of the second pulley section subgroup are arranged in a mutual staggered manner and form a combination pulley larger than the core pulley when in the joint states.

The invention provides an artery constrictor which comprises an artery vessel clamp device and an artery constriction device, wherein the artery constriction device comprises a hand wheel, a bidirectional transmission micro-shift mechanism and vessel constriction blades, the bidirectional transmission micro-shift mechanism comprises a bidirectional screw and two brackets, the bidirectional screw comprises left-handed first threads and right-handed second threads, the vessel constriction blades are respectively fixed on the two brackets, the hand wheel is connected with the bidirectional screw, and the vessel clamp device is arranged between the two vessel constriction blades. The bidirectional screw of the bidirectional transmission micro-shift mechanism is rotated by the hand wheel in the artery constrictor, so that the two vessel constriction blades on a drive screw oppositely move, and artery narrow deformation and control on the variation of blood flow are realized. The screw transmission has a big transmission ratio, and accurate control is easy to realize. In particular, the artery constrictor is simple and convenient to operate, and series products are formed by change of the vessel clamp device.

The invention relates to a lane-keeping assist system for a motor vehicle, which system can be activated and deactivated and allows steering intervention on an axle by means of active steering. The lane-keeping assist system, when activated, is designed to reduce the speed ratio of the active steering.

The invention concerns a transmission for the drive train of a rail vehicle having an input for connecting a drive motor of the rail vehicle; having an output for connecting the drive wheels of the rail vehicle; having a drive connection between the input and the output which forms a transmission ratio between 5 and 10. The invention is characterised in that the transmission ratio is formed by two transmission stages connected between one another in the drive connection, from which the first transmission stage has a transmission ratio between 1 and 2 and the second transmission stage connected downstream in the drive power flow after the first transmission stage from the input to the output has a transmission ratio of more than double the first transmission stage.

Surgical forceps are provided having an elongated shaft which at its distal end bears a forceps jaw having two jaw parts which are movable relative to one another, and at its proximal end bears an actuating handle which by means of a longitudinally displaceable actuating rod that passes through the shaft controls the relative motion of the jaw parts via the engagement of at least one cam on the forceps jaw or on the actuating rod in a groove which is inclined at an angle with respect to the direction of displacement of the actuating rod on the shaft or on the forceps jaw. The groove is provided, at least in one section, with an angle of inclination which is smaller than the angle of inclination up to which self-locking in the groove occurs.

The invention relates to a lifting mechanism and belongs to the field of engineering equipment, in particular to a mining excavator lifting mechanism. The mining excavator lifting mechanism comprises a primary speed reduction drive mechanism, a secondary speed reduction drive mechanism and a motor, the non-load end of the motor is provided with a brake, and the load end is connected with the primary speed reduction drive mechanism through a coupling. Because the mining excavator lifting mechanism uses a single-motor single-winding drum structure and two hoisting ropes, the diameter of each hoisting rope is small, the diameter of the lifting winding drum is small, the drive ratio is reduced, the whole mechanism is simple in structure, light in weight, small in volume, less in drive piece number and small in processing and assembly workload, and the manufacturing cost is greatly lowered.

The invention relates to the technical field of wind power generation equipment, in particular to a worm and gear type wind turbine blade adjusting mechanism. In the prior gear art, an adjusting mechanism has the problems that mechanism torque which needs to be adjusted is large, reliability is poor, and blade angles cannot be controlled easily. The mechanism comprises a worm gear base, an engine room cylinder wall, a driving motor fixing disc, a gear mechanism and a worm and gear mechanism. The engine room cylinder wall is connected to the driving motor fixing disc. The worm gear base is arranged on the engine room cylinder wall. A main transmission gear is assembled between the worm gear base and the driving motor fixing disc through a bearing and a bearing base. Two circles of transmission gears are arranged around the main transmission gear. The worm and the outer circle transmission gear are assembled between the driving motor fixing disc and the worm gear base coaxially. A worm wheel is arranged on a blade shaft on the inner side of the worm gear base. By changing the structure of the blade adjusting mechanism, the transmission mode is changed; transmission stability and accuracy are improved.

A transmission has a rotatable differential cage (74) and two output shafts (64). In order to distribute a torque between the output shafts (64), at least one balancing wheel (76) is rotatably mounted on the differential cage (74), which balancing wheel (76) is drive-coupled to a respective drive wheel (78) of the output shafts (64). The gearing also has at least one concavely curved coupling wheel (80) which is drive-coupled firstly to at least one of the drive wheels (78) and secondly to at least one hollow shaft (82). The hollow shaft (82) surrounds one of the output shafts (64). The hollow shaft (82) can be braked or driven relative to a part of the gearing.

The invention relates to the technical field of wind power generation equipment, in particular to a straight rack type wind turbine blade adjusting mechanism to solve the problems that the adjusting mechanism in the existing gear wheel technology is poor in reliability, a large torque of the adjusting mechanism is required, and a blade angle is difficult to control. The straight rack type wind turbine blade adjusting mechanism comprises a driving motor fixed disk, an engine room cylindrical wall, a rack fixed front disk, a rack fixed rear disk, a front pressure disk, a rear pressure disk, a gear and rack mechanism, a screw and nut mechanism, three sliding bar bearing pedestals, sliding bar bearings and sliding bars; the front pressure disk is connected on the driving motor fixed disk; the three sliding bar bearing pedestals are uniformly arranged on the rear pressure disk; blade shafts are mounted on the engine room cylindrical wall by bearings; gears are fixed at the end parts of the blade shafts on the inner side of the engine room cylindrical wall and engaged with racks; a nut is fixed in the middle of the rack fixed front disk; and a screw is matched with the nut and connected with an output mechanism of a power unit. According to the straight rack type wind turbine blade adjusting mechanism, by changing the structure of the blade adjusting mechanism and a transmission mode, the transmission stability and the accuracy are improved.

The invention relates to an assembly structure and an assembly method of a double-power-assisted mechanism of a recirculating ball steering gear. The invention belongs to the field of commercial vehicle electric power steering gears. The double-power-assisted mechanism is adopted on the recirculating ball type mechanical steering gear, and due to the fact that the double-power-assisted mechanism is adopted, when the output torque is low, the transmission ratio of the speed reducing mechanism can be reduced, and therefore the boundary dimension of the speed reducing mechanism is reduced; or the transmission ratio of the reducing mechanism is kept unchanged, the motor output torque requirement is reduced, and the motor cost and the motor appearance size can be greatly reduced. When the output torque is high, the requirement for the transmission ratio of a single speed reducing mechanism can be lowered, and the problems that the transmission ratio of a super-large speed reducing mechanism is caused by the requirement for the output torque, the appearance size is large due to the super-large transmission ratio of the speed reducing mechanism, and the strength of the speed reducing mechanism is sacrificed for reducing the appearance are solved.

The invention discloses a mechanical synchronous transmission, which mainly comprises a box body, an input shaft, an output shaft, a middle shaft, a gear pair, a synchronizer and a release bearing operating mechanism. The gear pair comprises a first-shift gear pair, a second-shift gear pair, a third-shift gear pair, a fourth-shift gear pair, a fifth-shift gear pair, a reverse gear pair and a box body; and the middle shaft and the output shaft are additionally provided with sixth-shift gear pairs. The mechanical synchronous transmission increases the sixth-shift gears with less transmission ratio; the transmission is matched with an engine to reduce the oil consumption of an integral vehicle so that the integral vehicle achieves the requirements of national discharge and oil consumption; and the mechanical synchronous transmission has reasonable transmission ratio, enough strength and reliability, and higher transmission efficiency and gear shifting comfort, and becomes the development tendency of future manual transmissions.

The invention discloses a novel high-power herringbone gear compound planetary transmission speed reducer. The novel high-power herringbone gear compound planetary transmission speed reducer comprises three-stage transmission systems. The speed reducer is characterized in that in the first-stage transmission system, a plurality of pairs of spiral bevel gears are employed to carry out transmission input conflux; in the second-stage transmission system, a differential planet transmission manner is employed to carry out power conflux; in the third-stage transmission system, a planetary transmission manner is employed to carry out power conflux; and power in the second-stage transmission system and the third-stage transmission system is gathered to a planet carrier for output. In the systems, except the bevel gears, all gears are herringbone gears, flexible pins with variable sections and sliding bearings are employed in the second-stage transmission system and the third-stage transmission system, a second-stage inner gear ring is in floating connection with a third-stage sun gear through a spline, a rigid fixing connection manner and an integral structure manner are not employed, the second-stage flexible pins are installed on the planet carrier, the third-stage flexible pins are installed on a casing, and the third-stage inner gear ring is in rigid fixing connection with the planet carrier. The novel high-power herringbone gear compound planetary transmission speed reducer is advantaged in that the speed reducer is large in transmission ratio, high in bearing capacity, low in vibration noise and wide in application prospect, and can operate stably.