Motor and internal combustion engine integrated hybrid power system controlled by magnetic gear ring

Abstract

A hybrid power driving system integrating a motor and an internal combustion engine is structurally composed of an internal combustion engine crankshaft, a flywheel, a clutch, a control device, the motor, an eddy current clutch, a one-way clutch and a transmission. According to the principle, a clutch of an internal combustion engine is integrated with a motor, and separation and combination of the clutch are achieved through magnetic force of a magnet; the magnet is used for exciting the rotor; multiple working modes such as internal combustion engine starting, internal combustion engine independent driving, motor independent driving, hybrid driving, internal combustion engine power generation, speed reduction and energy recovery, neutral gear sliding and parking idling can be achieved by integrating one motor and the internal combustion engine together.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the hybrid power technical field, especially relates to a motor and internal combustion engine integrated hybrid power system of magnetic gear ring control. BACKGROUND

[0002] Hybrid power systems can improve vehicle fuel economy in a variety of ways. For example, the internal combustion engine can be turned off during low speed periods, and the vehicle can be driven in pure electric mode to eliminate low efficiency operating conditions of the internal combustion engine. In addition, the torque or power deficiency of the internal combustion engine can be supplemented in hybrid drive mode by regenerative braking or by the electric motor generating power during operation of the internal combustion engine and storing the energy in the power battery; so that the internal combustion engine is always operated at high efficiency.

[0003] Most of the hybrid power systems developed by automobile manufacturers at present adopt a double motor structure, and in addition to the drive motor, a generator is also added; due to the existence of the internal combustion engine, the generator and the drive motor at the same time, the hybrid power system has a complex structure, occupies a large space, is heavy in weight, and is high in manufacturing cost. SUMMARY

[0004] The utility model solves the technical problems that: provide a kind of motor and internal combustion engine integrated hybrid power drive system, clutch and motor are gathered together, realize the "off", "union" and excitation for rotor of clutch using the magnetic force of magnet;With low cost and compact structure, the problem of the hybrid power system structure complexity, large space occupation, heavy weight and high cost is solved.

[0005] The utility model discloses a structure is by internal combustion engine crankshaft, flywheel, shell, clutch (including driven shaft, clutch cover, magnetic tooth ring, magnet, clutch driven disc, magnetic shield wheel), motor (including stator, stator coil, stator magnetic pole, flywheel, rotor magnetic pole), control device (including control ring, control motor, transmission nut, screw), electric eddy current clutch, one-way clutch and transmission composition. Wherein, flywheel is disc -shaped, is made of aluminium alloy, and a circle long strip -shaped, cross section is arc, evenly distributed and interval arrangement steel rotor magnetic pole is casted on it;Flywheel is installed on internal combustion engine crankshaft through bearing and one-way bearing and serves as rotor, and flywheel.The clutch is composed of a driven shaft, a clutch cover, a magnetic tooth ring, a magnet, a clutch driven disc and a magnetic shield wheel. The clutch cover is cylindrical and is made of low carbon steel. A plurality of long strip-shaped power transmission pin guide grooves are formed on the outer edge of the clutch cover. The clutch cover is fixed on the flywheel by screws. The magnetic tooth ring is cylindrical and is made of low carbon steel. The magnetic tooth ring is used for magnetic conduction. A circle of teeth is further formed on the inner circle of the magnetic tooth ring. The teeth are used for engaging with the teeth of the clutch driven disc to realize torque transmission. The magnetic tooth ring serves as the driving disc of the clutch. The power transmission pin is cylindrical. Rolling bearings can be arranged on the outer sleeve of the power transmission pin to reduce friction. The power transmission pin is arranged in the power transmission pin guide groove and can move in the power transmission pin guide groove. The power transmission pin is fixed on the magnetic tooth ring through the threads at the end portion. The power transmission pin is used to transmit power from the clutch cover to the magnetic tooth ring and to control the position of the magnetic tooth ring in cooperation with the control ring. The magnet is arc-shaped and is made of neodymium-iron-boron material. The magnet is fixed on the surface of the inner circle of the magnetic tooth ring. The adjacent magnets have opposite polarities and are used to generate a magnetic field. The number of the magnets is the same as the number of the teeth on the inner circle of the magnetic tooth ring. The driven shaft is stepped and has splines. One end of the driven shaft is installed on the clutch driven disc through the splines. The other end of the driven shaft is connected with the transmission shaft. The clutch driven disc is disc-shaped and is made of low carbon steel. A circle of teeth with the same number as the magnets is formed on the outer edge of the clutch driven disc. During operation, the teeth on the clutch driven disc correspond to the magnets. An air gap is formed between the teeth on the clutch driven disc and the magnets. The magnetic lines of force pass through the air gap to connect the clutch driven disc and the magnets together to transmit power. When the motor and the internal combustion engine work together to transmit large torque, the teeth on the clutch driven disc engage with the teeth on the magnetic tooth ring to transmit power. The clutch driven disc is installed on the flywheel through bearings. The magnetic shield wheel is ring-shaped and has teeth. The magnetic shield wheel is made of low carbon steel. A circle of teeth with the same number as the magnets is formed on the outer edge of the magnetic shield wheel. The magnetic shield wheel is used to form a closed loop with the magnets to completely separate the clutch. The magnetic shield wheel is installed on the clutch driven disc through bearings. The control device is composed of a control motor, a lead screw, a transmission nut and a control ring. The control motor is a stepping motor which can rotate in two directions. The shaft of the control motor is connected with the lead screw. The other end of the lead screw is installed on the housing through bearings. The transmission nut is screwed on the lead screw and is fixed together with the lugs on the control ring. The control ring is ring-shaped and has a recess in the middle. During assembly, the power transmission pin is located in the recess. A plurality of lugs are further formed on the outer edge of the control ring. The lugs are used to cooperate with the control ring guide grooves to guide the control ring when it slides. When the control motor drives the lead screw to rotate, the transmission nut moves along the lead screw in the axial direction and drives the control ring to slide along the control ring guide grooves. The control ring pushes the power transmission pin to drive the magnetic tooth ring to slide. The position of the magnets on the magnetic tooth ring is controlled to realize various working modes. The position of the magnetic tooth ring determines the engagement state of the clutch and the magnetic field strength of the rotor magnetic pole.When the magnet on the magnetic tooth ring is opposite to the magnetic shield wheel, the clutch is separated, and no power is outputted to the outside; when the magnet on the magnetic tooth ring is across between the magnetic shield wheel and the clutch driven disc, the power of the internal combustion engine is transmitted to the clutch driven disc through magnetic force; when the magnet on the magnetic tooth ring is across between the clutch driven disc and the left end of the rotor magnetic pole, the power of the motor and the internal combustion engine is transmitted to the clutch driven disc through magnetic force and the engagement of the teeth on the clutch driven disc and the teeth on the magnetic tooth ring, at this time, the motor can output power or generate electricity. The actual position of the magnet on the magnetic tooth ring across between the clutch driven disc and the left end of the rotor magnetic pole also determines the magnetic field strength of the rotor magnetic pole, and the output power or the generated power of the motor can be controlled. The transmission is a two-gear transmission, which is composed of a transmission shaft, a synchronizer, a low-speed gear driving gear and a high-speed gear driving gear, the transmission shaft and the driven shaft are connected together, the synchronizer is fixed on the transmission shaft, and the low-speed gear driving gear and the high-speed gear driving gear are installed on the transmission shaft through bearings and located on the two sides of the synchronizer.

[0006] The utility model discloses the beneficial effects: the traditional clutch is changed into the magnetic force or the engagement transmission of the tooth by friction transmission, makes the reliability and transmission capacity of clutch greatly improve, the clutch is gathered together with the motor, utilizes the magnet to realize the " separation " of clutch, " union " and the excitation of rotor, with low cost and compact structure, solves the problem of the complex structure of existing hybrid power system, large space occupation, large weight and high cost. BRIEF DESCRIPTION OF DRAWINGS

[0007] Attached Figure 1 It is the structure diagram of the utility model, in the drawing (1) magnetic shield wheel, (2) shell, (3) spline, (4) low-speed gear driving gear, (5) driven shaft, (6) transmission shaft, (7) synchronizer, (8) high-speed gear driving gear, (9) clutch driven disc, (10) magnetic tooth ring, (11) clutch cover, (12) power pin, (13) control ring guide groove, (14) control motor, (15) transmission nut, (16) power pin guide groove, (17) lead screw, (18) flywheel, (19) stator, (20) stator coil, (21) stator magnetic pole, (22) rotor magnetic pole, (23) coil, (24) electric eddy current clutch driven disc, (25) one-way clutch, (26) internal combustion engine crankshaft, (27) bearing, (28) electric eddy current clutch driven disc magnetic tooth, (29) magnetic separation groove, (30) electric eddy current clutch driving disc, (31) control ring, (32) internal combustion engine body, (33) magnet. DETAILED DESCRIPTION

[0008] Attached Figure 1The flywheel (18) in the flywheel (18) is disc-shaped, made of aluminum alloy, and has a circle of long strip-shaped, arc cross-section, evenly distributed and spaced steel rotor magnetic poles (22) cast on it; the flywheel (18) is installed on the internal combustion engine crankshaft (26) through bearings (27) and one-way bearings (25). A eddy current clutch is provided between the flywheel (18) and the internal combustion engine crankshaft (26) for starting the internal combustion engine; the eddy current clutch driving disc (30) is circular, made of steel, and fixed on the right end face of the flywheel (18); the eddy current clutch driven disc (24) is circular, made of steel, and fixed on the internal combustion engine crankshaft (26); the eddy current clutch driven disc (24) is provided with an annular cavity for accommodating the coil (23), and the bottom of the cavity is provided with a circle of discontinuous, magnetically isolated grooves (29); the left end face of the eddy current clutch driven disc (24) is provided with evenly distributed eddy current clutch driven disc magnetic guide teeth (28); the coil (23) is fixed on the internal combustion engine body (32), and the coil (23) is placed in the annular cavity of the eddy current clutch driven disc (24) with a gap. A one-way clutch (25) is provided between the flywheel (18) and the internal combustion engine crankshaft (26), and the one-way clutch (25) functions to integrate the flywheel (18) and the internal combustion engine crankshaft (26) when the internal combustion engine is driving, and outputs the power of the internal combustion engine to the outside. The stator (19) is circular, provided with the same number of stator magnetic poles (21) as the rotor magnetic poles (22), and the stator coil (20) is wound around the stator magnetic poles (21); the stator (19) is fixed on the internal combustion engine body (32); the rotor is the flywheel (18) and the rotor magnetic poles (22) thereon. The housing (2) is cylindrical, made of aluminum alloy, and has a plurality of control ring guide grooves (13) formed therein; the housing (2) is screwed onto the internal combustion engine body (32). The clutch cover (11) is cylindrical, made of low carbon steel, and has a plurality of long strip-shaped force transmission pin guide grooves (16) formed on the outer edge; the clutch cover (11) is screwed onto the flywheel (18); the magnetic tooth ring (10) is cylindrical, made of low carbon steel; the inner circle of the magnetic tooth ring (10) has a circle of teeth for engaging with the teeth of the clutch driven disc (9) to transmit torque; the force transmission pin (12) is cylindrical, and rolling bearings can be provided on the outer sleeve to reduce friction; the force transmission pin (12) is placed in the force transmission pin guide groove (16), and the force transmission pin (12) is fixed to the magnetic tooth ring (10) through the threads at the ends. The magnet (33) is arc-shaped, made of neodymium iron boron material, and fixed to the inner circular surface of the magnetic tooth ring (10) with opposite polarities of adjacent magnets.The driven shaft (5) is stepped, and has splines (3) formed thereon, one end of which is installed on the clutch driven plate (9) through the splines (3), and the other end is connected with the transmission shaft (6); the clutch driven plate (9) is disc-shaped, is made of low-carbon steel, and has a ring of teeth formed on the outer edge, the number of which is the same as that of the magnets (33); the clutch driven plate (9) is installed on the flywheel (18) through a bearing; the magnetic shielding wheel (1) is a circular ring with teeth formed thereon, is made of low-carbon steel, and has a ring of teeth formed on the outer edge, the number of which is the same as that of the magnets (33); the magnetic shielding wheel (1) is installed on the clutch driven plate (9) through a bearing. The control motor (14) is a reversible stepping motor, the shaft of which is connected with the lead screw (17), the other end of which is installed on the shell (2) through a bearing; the transmission nut (15) is screwed on the lead screw (17) and is fixed with the control ring (31) through lugs, the control ring (31) is a circular ring with a groove formed in the middle, the force transmission pin (12) is located in the groove during assembly, and the control ring (31) further has a plurality of lugs formed on the outer edge, which are used for guiding the control ring (31) to slide in cooperation with the control ring guide groove (13); the transmission shaft (6) is connected with the driven shaft (5), the synchronizer (7) is fixed on the transmission shaft (6), and the low-speed gear driving gear (4) and the high-speed gear driving gear (8) are installed on the transmission shaft (6) through bearings and are located on the two sides of the synchronizer (7).

[0009] Working principle:

[0010] In combination Figure 1 As shown in the figure, the working principle of the motor and internal combustion engine integrated hybrid power system controlled by the magnetic tooth ring mainly includes the following contents:

[0011] 1. Starting of the internal combustion engine

[0012] The internal combustion engine is started by dragging the internal combustion engine by the motor, the motor is operated, the coil of the electric eddy current clutch is electrified, and the magnetic lines of force are generated between the magnetic tooth of the clutch driven plate and the electric eddy current clutch driving plate. Due to the speed difference between the clutch driving plate and the electric eddy current clutch driven plate, the magnetic lines of force are cut to generate eddy current electromagnetic force, the electric eddy current clutch driving plate and the electric eddy current clutch driven plate are connected together, the motor can drive the internal combustion engine to rotate, and the starting of the internal combustion engine is realized. When the internal combustion engine is started, the coil is de-energized, and the electric eddy current clutch is separated; then, the one-way clutch between the flywheel and the internal combustion engine crankshaft is combined to connect the flywheel and the internal combustion engine crankshaft together, and the external output power of the internal combustion engine is output.

[0013] 2. Internal combustion engine mode

[0014] After the internal combustion engine starts, the power of the internal combustion engine is transmitted to the flywheel through the one-way clutch; at this time, the magnet is straddled between the magnetic shield wheel and the clutch driven plate, and the power of the internal combustion engine is transmitted to the clutch driven plate through the magnetic force between the magnet on the magnetic gear ring and the teeth on the clutch driven plate, and the power is output externally; at this time, the internal combustion engine is in high efficiency working condition. Because the flywheel and the clutch driven plate transmit torque by magnetic force, when the torque of the internal combustion engine fluctuates, the relative position between the flywheel and the clutch driven plate changes; therefore, a small amount of relative elastic displacement between the flywheel and the clutch driven plate is realized without disengaging the clutch, so that the torque fluctuation of the internal combustion engine will not be transmitted to the transmission.

[0015] 3. Pure electric mode

[0016] The internal combustion engine does not work, and the one-way clutch separates the internal combustion engine crankshaft from the flywheel; the magnet on the magnetic gear ring is straddled between the clutch driven plate and the left end of the rotor magnetic pole, and a part of the magnetic force line of the magnet on the magnetic gear ring forms a closed loop through the rotor magnetic pole and the stator magnetic pole and the stator, realizing excitation of the rotor, forming a permanent magnet motor; when the stator coil is energized, the rotor rotates, and the power of the motor is transmitted to the clutch driven plate through the engagement and magnetic force between the teeth on the magnetic gear ring and the teeth on the clutch driven plate; the actual position of the magnet on the magnetic gear ring straddled between the clutch driven plate and the left end of the rotor magnetic pole also determines the magnetic field strength of the rotor magnetic pole, so that the field weakening control of the motor can be realized, thereby controlling the output power and torque of the motor.

[0017] 4. Hybrid mode

[0018] When the motor and the internal combustion engine need to work, the magnet on the magnetic gear ring is straddled between the clutch driven plate and the left end of the rotor magnetic pole, and the power of the motor and the internal combustion engine is transmitted to the clutch driven plate through the engagement and magnetic force between the teeth on the magnetic gear ring and the teeth on the clutch driven plate; the motor and the internal combustion engine output power together. At the same time, the actual position of the magnet on the magnetic gear ring straddled between the clutch driven plate and the left end of the rotor magnetic pole also determines the magnetic field strength of the rotor magnetic pole, which can control the output power of the motor. At this time, if the battery has low power and the power of the internal combustion engine is sufficient, the motor can work as a generator; the internal combustion engine can be kept in high efficiency working condition, and the motor plays the role of energy regulation.

[0019] 5. Internal combustion engine power generation and charging mode

[0020] The internal combustion engine works, the one-way clutch is combined, the transmission is in neutral, and the motor is in power generation mode; at this time, the magnet on the magnetic gear ring is straddled between the clutch driven plate and the left end of the rotor magnetic pole, and the magnet on the magnetic gear ring excites the rotor magnetic pole; the internal combustion engine drives the flywheel (rotor) to rotate, the motor generates electricity to charge the battery; in addition, the battery can also be charged through the power supply.

[0021] 6. Deceleration and energy recovery mode

[0022] When the vehicle needs to decelerate or brake, the magnets on the magnetic tooth ring are across between the clutch driven plate and the left end of the rotor magnetic pole, the driven shaft and the clutch driven plate drive the flywheel to rotate; the motor is in the power generation mode, the generated electricity is stored in the battery, and the power generation consumes energy to realize the deceleration of the vehicle. At this time, there is no energy consumption of the internal combustion engine counter-drag; at the same time, the transmission can select high or low gear according to the deceleration or braking requirement to maximize the recovery of braking energy.

[0023] 7. Neutral coasting mode

[0024] When coasting in neutral, the magnets on the magnetic tooth ring are opposite to the magnetic shielding wheel, forming a closed loop; the magnetic shielding wheel is idling on the driven plate, the clutch is separated, and there is no energy consumption of the internal combustion engine counter-drag.

[0025] 8. Parking idle mode

[0026] When the vehicle is parked for a short time, the magnets on the magnetic tooth ring are opposite to the magnetic shielding wheel, the magnetic shielding wheel is idling on the driven plate, the clutch is separated, no power is output to the outside, and the internal combustion engine is in an idle state; the magnetic shielding wheel plays the role of a second mass flywheel to eliminate the idle resonance of the internal combustion engine.

[0027] 9. Gear shifting

[0028] The transmission has two gears and a neutral gear, and the synchronizer has three positions; when the synchronizer is in the right position, it is combined with the low-speed gear driving gear to form a low-speed gear, when the synchronizer is in the left position, it is combined with the high-speed gear driving gear to form a high-speed gear, and when the synchronizer is in the middle position, it is a neutral gear. During gear shifting, first, the control motor drives the lead screw to rotate, the transmission nut moves axially along the lead screw, drives the control ring to slide, and drives the magnetic tooth ring to slide to the position where the magnets on the magnetic tooth ring are opposite to the magnetic shielding wheel, so that the clutch is separated; then, the synchronizer is combined with the low-speed gear driving gear or the high-speed gear driving gear to the left or right position; finally, the control motor drives the lead screw to rotate, the transmission nut moves axially along the lead screw, drives the control ring to slide, and drives the magnetic tooth ring to slide to the position where the magnets on the magnetic tooth ring are opposite to the clutch driven plate, completing the gear shifting.

Claims

1. A magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system, characterized by: The motor and magnetic gear ring controlled integrated hybrid power system of internal combustion engine is composed of an internal combustion engine crankshaft, a flywheel, a housing, a clutch, a motor, a control device, an electric eddy current clutch, a one-way clutch and a transmission; the flywheel is disc-shaped and made of aluminum alloy, and a long strip-shaped steel rotor magnetic pole with arc-shaped cross section is cast on the flywheel; the flywheel serves as a rotor, and the flywheel is installed on the internal combustion engine crankshaft through bearings and a one-way bearing.

2. The magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system of claim 1, wherein: An electric eddy current clutch is arranged between the flywheel and the internal combustion engine crankshaft, and is used for starting the internal combustion engine; the electric eddy current clutch is composed of an electric eddy current clutch driving disc, a coil and an electric eddy current clutch driven disc; the electric eddy current clutch driving disc is circular ring-shaped and made of steel, and is fixed on the right end surface of the flywheel; the electric eddy current clutch driven disc is circular ring-shaped and made of steel, and is fixed on the internal combustion engine crankshaft; the electric eddy current clutch driven disc is provided with an annular cavity for placing the coil, and a discontinuous magnetic separation groove is formed in the bottom of the cavity; a plurality of electric eddy current clutch driven disc magnetic guide teeth are arranged on the left end surface of the electric eddy current clutch driven disc; the electric eddy current clutch driven disc serves as an iron core of the coil; the coil is fixed on the internal combustion engine body and is placed in the annular cavity of the driven disc, and a gap is left between the coil and the annular cavity of the driven disc.

3. The magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system of claim 1, wherein: A one-way clutch is arranged between the flywheel and the internal combustion engine crankshaft, and the one-way clutch is used for connecting the flywheel and the internal combustion engine crankshaft when the internal combustion engine is used for driving, and is used for disconnecting the flywheel and the internal combustion engine crankshaft when the internal combustion engine is not used for driving, so as to eliminate the energy loss caused by the reverse dragging of the internal combustion engine.

4. The magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system of claim 1, wherein: The motor is composed of a stator, a stator coil and a rotor; the stator is circular ring-shaped and is provided with a plurality of stator magnetic poles same as the number of rotor magnetic poles; the stator coil is wound on the stator magnetic poles; and the stator is fixed on the internal combustion engine body; and the rotor is the flywheel and the rotor magnetic poles on the flywheel.

5. The magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system of claim 1, wherein: The clutch is composed of a driven shaft, a clutch cover, a magnetic tooth ring, a magnet, a clutch driven disc and a magnetic shield wheel. The clutch cover is cylindrical and is made of low-carbon steel. A plurality of long strip-shaped power transmission pin guide grooves are formed on the outer edge of the clutch cover. The clutch cover is fixed on the flywheel by screws. The magnetic tooth ring is cylindrical and is made of low-carbon steel. The magnetic tooth ring is used for magnetic conduction. A circle of teeth is further formed on the inner circle of the magnetic tooth ring. The teeth are used for engaging with the teeth of the clutch driven disc to realize torque transmission. The magnetic tooth ring serves as the driving disc of the clutch. The power transmission pin is cylindrical. Rolling bearings can be arranged on the outer sleeve of the power transmission pin to reduce friction. The power transmission pin is arranged in the power transmission pin guide groove and can move in the power transmission pin guide groove. The power transmission pin is fixed on the magnetic tooth ring through the threads on the end portion. The magnet is arc-shaped and is made of neodymium-iron-boron material. The magnet is fixed on the surface of the inner circle of the magnetic tooth ring. The adjacent magnets have opposite polarities and are used for generating a magnetic field. The number of the magnets is the same as the number of the teeth on the inner circle of the magnetic tooth ring. The driven shaft is stepped and has splines. One end of the driven shaft is installed on the clutch driven disc through the splines. The other end of the driven shaft is connected with the transmission shaft. The clutch driven disc is disc-shaped and is made of low-carbon steel. A circle of teeth with the same number as the magnets is formed on the outer edge of the clutch driven disc. The clutch driven disc is installed on the flywheel through bearings. The magnetic shield wheel is annular and has teeth. The magnetic shield wheel is made of low-carbon steel. A circle of teeth with the same number as the magnets is formed on the outer edge of the magnetic shield wheel. The magnetic shield wheel forms a closed loop with the magnets to completely separate the clutch. The magnetic shield wheel is installed on the clutch driven disc through bearings.

6. The magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system of claim 1, wherein: The control device is composed of a control motor, a lead screw, a transmission nut and a control ring. The control motor is a step motor which can rotate in both directions. The shaft of the control motor is connected with the lead screw. The other end of the lead screw is installed on the shell through bearings. The transmission nut is screwed on the lead screw and is fixed with the lugs on the control ring. The control ring is annular and has a recess in the middle. The power transmission pin is located in the recess during assembly. A plurality of lugs are further formed on the outer edge of the control ring. The lugs are used for cooperating with the control ring guide grooves to guide the sliding of the control ring.

7. The magnetic toothed ring controlled motor and internal combustion engine integrated hybrid powertrain system of claim 1, wherein: The transmission is a two-gear transmission and is composed of a transmission shaft, a synchronizer, a low-speed gear driving gear and a high-speed gear driving gear. The transmission shaft and the driven shaft are connected together. The synchronizer is fixed on the transmission shaft. The low-speed gear driving gear and the high-speed gear driving gear are installed on the transmission shaft through bearings and are located on the two sides of the synchronizer.

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