CN204921865U - Electronic stylus pin coupling device formula third gear electric automobile automatic gearbox - Google Patents

Abstract

The utility model discloses an electric finger joint device-type three-speed automatic transmission for electric vehicles. The input gear is installed on the transmission input shaft, and the input gear is constantly meshed with the input gear of the first gear and the input gear of the second gear; the input gear of the first gear, the input gear of the second gear and the input gear are respectively engaged with the electric fingers of the first gear, second gear and third gear The output disk of the device is fixedly connected; by controlling the engagement and separation of the first gear, second gear and third gear electric finger joint device, the gear shift control of the electric finger joint device type three-speed electric vehicle automatic transmission is realized. When the electric finger valve of the electric finger joint device is not energized, the output disk is in a separated state under the action of the return spring; when the electric finger valve is energized, the electric finger moves toward the output disk against the elastic force under the action of electromagnetic force , slide into the arc-shaped ring groove in the rotating state, push the output disc to rotate synchronously, and the engaging device engages. The utility model has the advantages of compact structure, power shifting, no mechanical or hydraulic shifting parts and the like.

Description

Electric finger joint type three-speed automatic transmission for electric vehicles

technical field

The utility model belongs to the technical field of electric vehicle transmission, and relates to an automatic transmission for electric vehicles, more precisely an electric finger joint device-type three-speed automatic transmission for electric vehicles.

Background technique

Automatic transmissions are widely used in various vehicles such as automobiles, electric vehicles, and construction machinery. Existing automatic transmissions mainly include hydromechanical automatic transmission (AT), metal belt continuously variable automatic transmission (CVT), mechanical automatic transmission (AMT), and double clutch automatic transmission (DCT).

The above-mentioned four types of automatic transmissions all adopt electronically controlled hydraulic servo devices to realize the control of the gear shifting process. The structure is complicated, the cost is high, and the control difficulty and complexity are increased. In particular, the actuators of DCT include: an oil supply mechanism composed of hydraulic pumps, hydraulic valves and accumulators, a gear shift actuator driven by hydraulic pressure or electric motors, and an engagement device operating mechanism driven by hydraulic pressure or electric motors. These hydraulic control mechanisms make the overall structure of the transmission complex, the cost is high, and the control difficulty and complexity are increased.

Utility model content

The purpose of this utility model is to overcome the deficiencies of various existing automatic transmission technologies, and provide a new type of electric finger joint device-type three-speed automatic transmission for electric vehicles that can realize power shifting and has high reliability and low cost. .

The technical scheme of the utility model is as follows:

An electric finger pin joint device-type three-speed automatic transmission for electric vehicles, comprising a transmission input shaft, an input gear, a first-speed input gear, a second-speed input gear, a first-speed driving gear, a first-speed driven gear, a second-speed driving gear, a second-speed driving gear, and a second-speed driving gear. The gear driven gear; the input gear is fixedly installed on the transmission input shaft; the input gear is constantly meshed with the first gear input gear and the second gear input gear respectively along the outer side of the gear circumference.

It is characterized in that it also includes a first gear electric finger joint device, a second gear electric finger joint device and a third gear electric finger joint device.

The first-speed electric finger joint device includes an input plate of the first-speed electric finger joint device, a first electric finger valve of the first-speed electric finger joint device, and a second electric finger valve of the first-speed electric finger joint device , the output plate of the first-speed electric finger joint device, the inner convex teeth of the first-speed electric finger joint device, the buffer plate of the first-speed electric finger joint device, the outer convex teeth of the first-speed electric finger joint device, and the first-speed electric finger joint device. The arc ring groove of the finger joint, the rubber spring element of the electric finger joint of the first gear, the transmission shaft of the electric finger joint of the first gear.

The second-speed electric finger joint device includes an input plate of the second-speed electric finger joint device, a first electric finger valve of the second-speed electric finger joint device, and a second electric finger valve of the second-speed electric finger joint device , the output disk of the second-speed electric finger joint device, the inner convex teeth of the second-speed electric finger joint device, the buffer plate of the second-speed electric finger joint device, the outer convex teeth of the second-speed electric finger joint device, and the second-speed electric finger joint device. The arc ring groove of the finger joint, the rubber spring element of the second-speed electric finger joint, the transmission shaft of the second-speed electric finger joint.

The third-speed electric finger joint device includes an input plate of the third-speed electric finger joint device, a first electric finger valve of the third-speed electric finger joint device, and a second electric finger valve of the third-speed electric finger joint device , the output disk of the third-speed electric finger joint device, the inner convex teeth of the third-speed electric finger joint device, the buffer plate of the third-speed electric finger joint device, the outer convex teeth of the third-speed electric finger joint device, and the third-speed electric finger joint device. The arc-shaped ring groove of the finger joint, the rubber spring element of the third-speed electric finger joint, and the transmission shaft of the third-speed electric finger joint.

One end face of the output disk of the first-gear electric finger joint device is fixedly connected to one end face of the first-gear input gear; the first-gear input gear is rollingly mounted on the transmission shaft of the first-gear electric finger joint device through bearings.

The first electric finger valve of the first gear electric finger joint device and the second electric finger valve of the first gear electric finger joint device are symmetrically installed on the input disk of the first gear electric finger joint device; The first electric finger valve of the finger engagement device includes the first electromagnetic coil of the first-speed electric finger engagement device and the first electric finger of the first-speed electric finger engagement device; An electric finger pin is fixedly installed on one end of the iron core of the first electric finger engagement device of the first-gear electric finger engagement device; The second electromagnetic coil of the first gear electric finger joint device and the second electric finger of the first gear electric finger joint device; the second electric finger of the first gear electric finger joint device is fixedly installed on the second electric finger joint device of the first gear One end of the iron core of the pin valve.

An L-shaped annular cavity is provided on the end face of the output disc of the first-gear electric finger engagement device far away from the first-gear input gear, and a buffer plate of the first-gear electric finger engagement device and a plurality of first-gear electric fingers are installed in the cavity. The rubber spring element of the engagement device; the outer convex teeth of the first-grade electric finger engagement device on the outer cylindrical surface of the buffer disc of the first-grade electric finger engagement device and the first-grade electric finger engagement device in the L-shaped annular cavity A rubber spring element of the first-gear electric finger engagement device is respectively installed between the inner teeth of the first-gear electric finger engagement device; one pressure-bearing side of each rubber spring element of the first-gear electric finger engagement device abuts against the first-gear electric finger engagement device The side surface of the inner convex tooth and the other pressure-bearing side are against the outer convex tooth side of the first-gear electric finger pin engagement device; There are two arc-shaped ring grooves of the first-gear electric finger engagement device symmetrically distributed in the center; the width of each arc-shaped ring groove of the first-gear electric finger engagement device is the same as the first electric The diameter of the finger and the diameter of the second electric finger of the first-gear electric finger engagement device are equal; Distance from the axis of the first electric finger of the device to the axis of the input disc of the first-speed electric finger joint, the second axis of the electric finger of the first-speed electric finger joint to the axis of the input disc of the first-speed electric finger joint The distances between the axes are equal; the central angle corresponding to the arc-shaped ring groove of each first-speed electric finger joint device is 90-180°; the two arc-shaped ring grooves of each first-speed electric finger joint device The end depth is equal to the maximum protruding length of the first electric finger of the first-grade electric finger joint device and the maximum protruding length of the second electric finger of the first-grade electric finger joint device. The middle depth of the arc-shaped ring groove is zero, and the depth of the rest of the arc-shaped ring groove of each first gear electric finger engaging device gradually and smoothly transitions.

There is always a certain gap between the end surface of the buffer disc of the first-gear electric finger joint device away from the first-gear input gear and the end surface of the first-gear electric finger joint device's input disc close to the first-gear input gear.

One end face of the output disc of the second-gear electric finger joint device is fixedly connected to one end face of the second-gear input gear; the second-gear input gear is rollingly mounted on the transmission shaft of the second-gear electric finger joint device through bearings.

The first electric finger valve of the second-speed electric finger joint device and the second electric finger valve of the second-speed electric finger joint device are symmetrically installed on the input disk of the second-speed electric finger joint device; The first electric finger valve of the electric finger engagement device includes the first electromagnetic coil of the second-speed electric finger engagement device and the first electric finger of the second-speed electric finger engagement device; The first electric finger pin is fixedly installed on one end of the iron core of the first electric finger pin valve of the second-speed electric finger joint device; the second electric finger valve of the second-speed electric finger joint The second electromagnetic coil of the device and the second electric finger of the second-speed electric finger engagement device; the second electric finger of the second-speed electric finger engagement device is fixedly installed on the second electric One end of the core of the pin valve.

An L-shaped annular cavity is provided on the end surface of the output disk of the second-gear electric finger joint device far away from the second-gear input gear, and a buffer plate of the second-gear electric finger joint device and a plurality of second-gear electric finger joints are installed in the cavity. The rubber spring element of the pin joint device; the outer convex teeth of the second gear electric finger pin joint device on the outer cylindrical surface of the buffer disk of the second gear electric finger pin joint device engage with the second gear electric finger pin in the L-shaped annular cavity A rubber spring element of the second-gear electric finger pin engagement device is respectively installed between the inner convex teeth of the device; one pressure-bearing side of each rubber spring element of the second-gear electric finger pin engagement device abuts against the second-gear electric finger pin engagement device The inner convex tooth side of the second gear, and the other pressure-bearing side is against the outer convex tooth side of the second-speed electric finger pin engagement device; the buffer plate of the second-speed electric finger pin engagement device is far from the end surface of the second-speed input gear There are two arc-shaped ring grooves of the second-speed electric finger joint device distributed symmetrically in the center; the width of the arc-shaped ring groove of each second-speed electric finger joint device is the same as the first The diameter of the electric finger pin and the diameter of the second electric finger pin of the second gear electric finger joint device are equal; The distance from the axis of the first electric finger joint of the engagement device to the axis of the input disk of the second-speed electric finger engagement device, the second electric finger axis of the second-speed electric finger engagement device to the input disk of the second-speed electric finger engagement device The distances between the shaft axes are equal; the central angle corresponding to the arc-shaped ring groove of each second-speed electric finger joint device is 60-150°; the arc-shaped ring groove of each second-speed electric finger joint device The depth of one end is equal to the maximum protruding length of the first electric finger of the second-speed electric finger joint device, and the maximum protruding length of the second electric finger of the second-speed electric finger joint device. The depth of the other end of the arc-shaped ring groove is zero, and the depth of the middle part of the arc-shaped ring groove of each second-gear electric finger engaging device gradually and smoothly transitions.

There is always a certain gap between the end surface of the buffer disc of the second-gear electric finger joint device away from the second-gear input gear and the end surface of the input disc of the second-gear electric finger joint device close to the second-gear input gear.

One end surface of the output disk of the third-speed electric finger joint device is fixedly connected to one end surface of the input gear.

The first electric finger valve of the third-speed electric finger joint device and the second electric finger valve of the third-speed electric finger joint device are symmetrically installed on the input disk of the third-speed electric finger joint device; The first electric finger valve of the finger joint device includes the first electromagnetic coil of the third-speed electric finger joint device and the first electric finger of the third-speed electric finger joint device; the first electric finger of the third-speed electric finger joint device An electric finger is fixedly installed on one end of the iron core of the first electric finger valve of the three-speed electric finger joint device; the second electric finger valve of the three-speed electric finger joint device includes the three-speed electric finger joint device The second electromagnetic coil and the second electric finger of the third-speed electric finger joint device; the second electric finger of the third-speed electric finger joint device is fixedly installed on the second electric finger of the third-speed electric finger joint device. One end of the iron core of the pin valve.

An L-shaped annular cavity is provided on the end surface of the output disc of the third-gear electric finger joint device away from the input gear, and a buffer plate of the third-gear electric finger joint device and a plurality of third-gear electric finger joint devices are installed in the cavity The rubber spring element of the third gear electric finger joint device; the outer convex teeth of the third gear electric finger joint device on the outer cylindrical surface of the buffer plate of the third gear electric finger joint device and the inner teeth of the third gear electric finger joint device in the L-shaped annular cavity A rubber spring element of the three-speed electric finger joint is respectively installed between the teeth; one pressure-bearing side of each rubber spring element of the three-speed electric finger joint abuts against the inner protrusion of the three-speed electric finger joint The tooth side, and the other pressure-bearing side abuts against the outer convex tooth side of the third-gear electric finger pin engagement device; the buffer plate of the third-gear electric finger pin engagement device is also provided with two centers on the end face away from the input gear. The arc-shaped annular grooves of the three-speed electric finger joint devices symmetrically distributed; 1. The diameters of the second electric fingers of the third-gear electric finger engagement devices are all equal; The distance from the axis of the electric finger pin to the axis of the input disk of the third-speed electric finger joint device, and the distance from the second electric finger axis of the third-speed electric finger joint device to the axis of the input disc shaft of the third-speed electric finger joint device equal; the central angle corresponding to the arc-shaped ring groove of each third-gear electric finger engagement device is 60-150°; the depth of one end of the arc-shaped ring groove of each third-gear electric finger engagement device The maximum protruding length of the first electric finger of the electric finger joint device and the maximum protruding length of the second electric finger of the third-speed electric finger joint device are equal, and the arc-shaped ring groove of each third-speed electric finger joint device The depth of the other end is zero, and the depth of the middle part of the arc-shaped ring groove of each three-speed electric finger joint device gradually and smoothly transitions.

There is always a certain gap between the end surface of the buffer disk of the third-speed electric finger joint device away from the input gear and the end surface of the input disk of the third-speed electric finger joint device close to the input gear.

Compared with the prior art, the utility model has the advantages of:

(1) The electric finger joint device-type three-speed automatic transmission for electric vehicles of the present utility model cancels the main joint device, synchronizer and shift fork mechanism of the traditional transmission, and realizes gear shifting by directly controlling the coil current of the joint device, The structure is simplified, the cost is reduced, and the failure rate is also reduced;

(2) The electric finger joint device type three-speed electric vehicle automatic transmission of the utility model is constantly meshed between the transmission gears, and there is no need to cut off the power during the shifting process, which reduces the shifting impact and improves the acceleration performance and driving comfort of the car sex;

(3) The electric finger joint device of the utility model is a two-speed automatic transmission for electric vehicles. The electric finger joint device transmits the input torque of the input disc to the output disc through the thrust action of the electric finger pin on the output disc, and is small in size and light in weight. , Large transmission torque, high speed and high transmission efficiency.

Description of drawings

Fig. 1 is a schematic structural view of an electric finger joint device-type three-speed automatic transmission for an electric vehicle according to an embodiment of the present invention.

Fig. 2 is a perspective view of the output disk of the first gear electric finger joint device according to the embodiment of the present invention.

Fig. 3 is a perspective view of the buffer plate of the first gear electric finger joint device according to the embodiment of the present invention.

Fig. 4 is a perspective view of the rubber spring element of the first gear electric finger engagement device according to the embodiment of the present invention.

Fig. 5 is a perspective view of the output disk of the second-speed electric finger joint device according to the embodiment of the present invention.

Fig. 6 is a perspective view of the buffer plate of the second gear electric finger joint device according to the embodiment of the present invention.

Fig. 7 is a perspective view of the rubber spring element of the second gear electric finger engagement device according to the embodiment of the present invention.

Fig. 8 is a perspective view of the output disk of the three-speed electric finger joint device according to the embodiment of the present invention.

Fig. 9 is a perspective view of the buffer plate of the three-speed electric finger joint device according to the embodiment of the present invention.

Fig. 10 is a perspective view of the rubber spring element of the three-speed electric finger joint device according to the embodiment of the present invention.

In the figure: 10. First gear electric finger engagement device 10a. Input plate 10b of first gear electric finger engagement device. First electric finger valve 10c. First gear electric finger engagement device. First solenoid coil 10d. First electric finger pin 10e of the first-speed electric finger joint device. Second electric finger valve 10f of the first-speed electric finger joint device. Second solenoid coil 10g of the first-speed electric finger joint device. The second electric finger 10h of the first-speed electric finger joint. The output disk 10i of the first-speed electric finger joint. The inner convex tooth 10j of the first-speed electric finger joint. The buffer of the first-speed electric finger joint. Disk 10k. Outer convex teeth of first gear electric finger joint 10m. Arc-shaped ring groove of first gear electric finger joint 10n. Rubber spring element of first gear electric finger joint 10p. First gear electric finger joint 20. The second-speed electric finger joint device 20a. The input plate of the second-speed electric finger joint device 20b. The first electric finger valve of the second-speed electric finger joint device 20c. The second-speed electric finger joint device First electromagnetic coil 20d. First electric finger 20e of the second-speed electric finger joint device. Second electric finger valve 20f of the second-speed electric finger joint device. Second solenoid coil 20g of the second-speed electric finger joint device. .Second electric finger 20h of the second-speed electric finger clutch. Output disc 20i of the second-speed electric finger clutch. Inner convex tooth 20j of the second-speed electric finger clutch. Buffer of the second-speed electric finger clutch. Disk 20k. Outer convex teeth of the second-speed electric finger joint 20m. Arc-shaped ring groove of the second-speed electric finger joint 20n. Rubber spring element of the second-speed electric finger joint 20p. Second-speed electric finger joint The transmission shaft 30. The third-speed electric finger joint device 30a. The input plate of the third-speed electric finger joint device 30b. The first electric finger valve of the third-speed electric finger joint device 30c. The third-speed electric finger joint device First electromagnetic coil 30d. First electric finger 30e of the third-speed electric finger joint device. Second electric finger valve 30f of the third-speed electric finger joint device. Second electromagnetic coil 30g of the third-speed electric finger joint device. The second electric finger 30h of the third-speed electric finger joint. The output disk 30i of the third-speed electric finger joint. The inner convex tooth 30j of the third-speed electric finger joint. The buffer of the third-speed electric finger joint. Disk 30k. Outer convex teeth of third-speed electric finger joint 30m. Arc-shaped ring groove of third-speed electric finger joint 30n. Rubber spring element of third-speed electric finger joint 30p. Third-speed electric finger joint Transmission shaft 4. Transmission housing 41. Transmission input shaft 5. Input gear 6. First gear input gear 7. Second gear input gear 8a. First gear driving gear 8b. First gear driven gear 9a. Second gear driving gear 9b. Second gear driven gear.

Detailed ways

Below in conjunction with the accompanying drawings in the utility model embodiment, the technical solution in the utility model embodiment is described in detail, obviously, the described embodiment is only a part of the utility model embodiment, rather than all embodiments; For the embodiments in the utility model, all other embodiments obtained by persons of ordinary skill in the art without creative work belong to the scope of protection of the utility model.

As shown in Figure 1, an electric finger joint device type three-speed automatic transmission for electric vehicles of the present invention includes a transmission housing 4, a transmission input shaft 41, an input gear 5, a first-speed input gear 6, and a second-speed input gear 7. First gear driving gear 8a, first gear driven gear 8b, second gear driving gear 9a, second gear driven gear 9b, first gear electric finger joint device 10, second gear electric finger joint device 20 and third gear electric finger joint The pin joint device 30; the input gear 5 is fixedly installed on the transmission input shaft 41; the input gear 5 is constantly meshed with the first gear input gear 6 and the second gear input gear 7 respectively along the circumferential outer side of the gear; the first gear driving gear 8a is fixedly installed on a On the transmission shaft 10p of the first-gear electric finger joint device; the first-gear driving gear 8a is in constant mesh with the first-gear driven gear 8b; the second-gear driving gear 9a is fixedly installed on the transmission shaft 20p of the second-gear electric finger joint device; the second gear The driving gear 9a is in constant mesh with the second-gear driven gear 9b; the first-gear driven gear 8b and the second-gear driving gear 9b are sequentially fixedly installed on the transmission shaft 30p of the third-gear electric finger joint device.

The first gear electric finger joint device 10 includes an input plate 10a of the first gear electric finger joint device, a first electric finger valve 10b of the first gear electric finger joint device, and a second electric finger pin of the first gear electric finger joint device. Valve 10e, output plate 10h of the first-speed electric finger joint device, inner convex teeth 10i of the first-speed electric finger joint device, buffer disc 10j of the first-speed electric finger joint device, and outer convex teeth of the first-speed electric finger joint device Teeth 10k, arc-shaped ring groove 10m of the first gear electric finger joint device, rubber spring element 10n of the first gear electric finger joint device, transmission shaft 10p of the first gear electric finger joint device.

The second-speed electric finger joint device 20 includes an input plate 20a of the second-speed electric finger joint device, a first electric finger valve 20b of the second-speed electric finger joint device, and a second electric finger pin of the second-speed electric finger joint device. Valve 20e, output disk 20h of the second-speed electric finger joint device, inner convex teeth 20i of the second-speed electric finger joint device, buffer plate 20j of the second-speed electric finger joint device, and outer protrusion of the second-speed electric finger joint device Teeth 20k, arc ring groove 20m of the second gear electric finger joint device, rubber spring element 20n of the second gear electric finger joint device, transmission shaft 20p of the second gear electric finger joint device.

The third-speed electric finger joint device 30 includes an input disc 30a of the third-speed electric finger joint device, a first electric finger valve 30b of the third-speed electric finger joint device, and a second electric finger pin of the third-speed electric finger joint device. Valve 30e, output plate 30h of the third-speed electric finger joint device, inner convex teeth 30i of the third-speed electric finger joint device, buffer plate 30j of the third-speed electric finger joint device, and outer convex teeth of the third-speed electric finger joint device. Teeth 30k, arc-shaped ring groove 30m of the third-gear electric finger joint device, rubber spring element 30n of the third-gear electric finger joint device, transmission shaft 30p of the third-gear electric finger joint device.

One end face of the output disc 10h of the first-gear electric finger joint device is fixedly connected to one end face of the first-gear input gear 6 by bolts; the first-gear input gear 6 is mounted on the transmission shaft 10p of the first-gear electric finger joint device through bearing rolling .

As shown in Figures 2 to 4, the first electric finger valve 10b of the first-gear electric finger engagement device and the second electric valve 10b of the first-gear electric finger engagement device are symmetrically installed on the input disk 10a of the first-gear electric finger engagement device. The finger valve 10e; the first electric finger valve 10b of the first gear electric finger engagement device includes the first electromagnetic coil 10c of the first gear electric finger engagement device and the first electric finger pin 10d of the first gear electric finger engagement device; The first electric finger 10d of the first-gear electric finger engagement device is fixedly installed at one end of the iron core of the first electric finger pin valve 10b of the first-gear electric finger engagement device; the second electric finger of the first-gear electric finger engagement device The valve 10e includes a second electromagnetic coil 10f of the first-gear electric finger engagement device and a second electric finger 10g of the first-gear electric finger engagement device; the second electric finger 10g of the first-gear electric finger engagement device is fixedly mounted on a One end of the iron core of the second electric finger valve 10e of the gear electric finger engagement device.

The output plate 10h of the first-gear electric finger joint device is provided with an L-shaped annular cavity on the end face away from the first-gear input gear 6, and the buffer disc 10j of the first-gear electric finger joint device and a plurality of first-gear electric finger joints are installed in the cavity. The rubber spring element 10n of the pin engagement device; the outer convex tooth 10k of the first gear electric finger pin engagement device on the outer cylindrical surface of the buffer plate 10j of the first gear electric finger pin engagement device and the first gear electric finger pin in the L-shaped annular cavity A rubber spring element 10n of the first-gear electric finger engagement device is respectively installed between the inner convex teeth 10i of the engagement device; one pressure-bearing side of each rubber spring element 10n of the first-gear electric finger engagement device abuts against the first-gear electric finger engagement device. The tooth side of the inner convex tooth 10i of the finger joint device, and the other pressure-bearing side against the tooth side of the outer convex tooth 10k of the first-gear electric finger joint device; the buffer plate 10j of the first-gear electric finger joint device is far away from the first-gear input The end face of the gear 6 is also provided with two center-symmetrically distributed arc-shaped ring grooves 10m of the first-grade electric finger engagement device; The diameter of the first electric finger 10d of the pin engaging device and the diameter of the second electric finger 10g of the first-speed electric finger engaging device are equal; the center line of the arc-shaped ring groove 10m of each first-speed electric finger engaging device The distance between the radius and the axis of the first electric finger 10d of the first-gear electric finger engagement device to the axis of the input disc 10a of the first-gear electric finger engagement device, and the distance from the axis of the second electric finger 10g of the first-gear electric finger engagement device to The distance between the axis of the input disc shaft 10a of the first-gear electric finger joint device is equal; the central angle corresponding to the arc-shaped ring groove 10m of each first-gear electric finger joint device is 150°; each first-gear electric finger joint device The depth of both ends of the arc-shaped ring groove 10m is equal to the maximum extension length of the first electric finger 10d of the first-speed electric finger engagement device, and the maximum extension length of the second electric finger 10g of the first-stage electric finger engagement device , the middle depth of the arc-shaped annular groove 10m of each first-gear electric finger engaging device is zero, and the depth of the rest of the arc-shaped annular groove 10m of each first-gear electric finger engaging device transitions gradually and smoothly.

There is always a certain gap between the end surface of the buffer disc 10j of the first-gear electric finger joint device away from the first-gear input gear 6 and the end surface of the first-gear electric finger joint device's input disc 10a close to the first-gear input gear 6 .

One end surface of the output disk 20h of the second-speed electric finger joint device is fixedly connected to one end surface of the second-speed input gear 7 by bolts; the second-speed input gear 7 is mounted on the transmission shaft 20p of the second-speed electric finger joint device by bearing rolling .

As shown in Figures 5 to 7, the first electric finger valve 20b of the second-speed electric finger joint device and the second valve 20b of the second-speed electric finger joint device are symmetrically installed on the input disk 20a of the second-speed electric finger joint device. Electric finger valve 20e; the first electric finger valve 20b of the second-speed electric finger engagement device includes the first electromagnetic coil 20c of the second-speed electric finger engagement device and the first electric finger pin 20d of the second-speed electric finger engagement device The first electric finger 20d of the second gear electric finger joint device is fixedly installed on one end of the iron core of the first electric finger pin valve 20b of the second gear electric finger joint device; the second electric finger joint of the second gear electric finger joint device The pin valve 20e includes the second electromagnetic coil 20f of the second-speed electric finger engagement device and the second electric finger 20g of the second-speed electric finger engagement device; the second electric finger 20g of the second-speed electric finger engagement device is fixedly installed on One end of the iron core of the second electric finger pin valve 20e of the second gear electric finger engagement device.

The output disk 20h of the second-gear electric finger joint device is provided with an L-shaped annular cavity on the end face away from the second-gear input gear 7, and the buffer disc 20j of the second-gear electric finger joint device and a plurality of second-gear electric pin joint devices are installed in the cavity. The rubber spring element 20n of the finger joint device; the outer convex teeth 20k of the second gear electric finger joint device on the outer cylindrical surface of the buffer disk 20j of the second gear electric finger joint device and the second gear electric finger joint in the L-shaped annular cavity. A rubber spring element 20n of the second-gear electric finger pin engagement device is respectively installed between the inner convex teeth 20i of the pin engagement device; one pressure-bearing side of each rubber spring element 20n of the second-gear electric finger engagement device abuts against the second gear The tooth side of the inner convex tooth 20i of the electric finger pin engagement device, and the other pressure-bearing side abuts against the outer convex tooth 20k tooth side of the second gear electric finger pin engagement device; the buffer plate 20j of the second gear electric finger pin engagement device is far away from the second gear The end face of the input gear 7 is also provided with two arc-shaped ring grooves 20m of the center-symmetrically distributed second-gear electric finger engagement device; The diameter of the first electric finger 20d of the finger engaging device and the diameter of the second electric finger 20g of the second gear electric finger engaging device are equal; the center of the arc-shaped ring groove 20m of each second gear electric finger engaging device Line radius and the distance from the axis of the first electric finger 20d of the second-speed electric finger joint device to the axis of the input disk 20a of the second-speed electric finger joint device, and the axis of the second electric finger 20g of the second-speed electric finger joint device The distances to the axis of the input disc shaft 20a of the second-gear electric finger engagement device are equal; the central angle corresponding to the arc-shaped ring groove 20m of each second-gear electric finger engagement device is 90°; each second-gear electric finger engagement The depth of one end of the arc-shaped ring groove 20m of the device is equal to the maximum extension length of the first electric finger 20d of the second-speed electric finger engagement device, and the maximum extension length of the second electric finger 20g of the second-speed electric finger engagement device. The depth of the other end of the arc-shaped ring groove 20m of each second-speed electric finger joint device is zero, and the depth of the middle part of the arc-shaped ring groove 20m of each second-speed electric finger joint device gradually transitions smoothly.

There is always a certain gap between the buffer disk 20j of the second-gear electric finger joint device and the end surface of the input disc 20a of the second-gear electric finger joint device close to the second-speed input gear 7 .

One end surface of the output disk 30h of the third-speed electric finger joint device is fixedly connected to one end surface of the input gear 5 by bolts.

As shown in Figures 8 to 10, the input plate 30a of the third-speed electric finger joint device is symmetrically installed with the first electric finger valve 30b of the third-speed electric finger joint device and the second electric valve 30b of the third-speed electric finger joint device. The finger valve 30e; the first electric finger valve 30b of the third-speed electric finger engagement device includes the first electromagnetic coil 30c of the third-speed electric finger engagement device and the first electric finger 30d of the third-speed electric finger engagement device; The first electric finger 30d of the third gear electric finger joint device is fixedly installed on one end of the iron core of the first electric finger pin valve 30b of the third gear electric finger joint device; the second electric finger pin of the third gear electric finger joint device The valve 30e includes the second electromagnetic coil 30f of the third-speed electric finger joint device and the second electric finger 30g of the third-speed electric finger joint device; the second electric finger 30g of the third-speed electric finger joint device is fixedly installed on the third One end of the iron core of the second electric finger valve 30e of the gear electric finger engagement device.

The output disk 30h of the third-gear electric finger joint device is provided with an L-shaped annular cavity on the end face away from the input gear 5, and the buffer disc 30j of the third-gear electric finger joint device and a plurality of third-gear electric finger joints are installed in the cavity. The rubber spring element 30n of the device; the outer convex teeth 30k of the third-gear electric finger-pin engagement device on the outer cylindrical surface of the buffer disc 30j of the third-gear electric finger-pin engagement device and the third-gear electric finger-pin engagement device in the L-shaped annular cavity A rubber spring element 30n of the third-gear electric finger engagement device is respectively installed between the inner convex teeth 30i; one pressure-bearing side of each rubber spring element 30n of the third-gear electric finger engagement device abuts against the third-gear electric finger pin The tooth side of the inner convex tooth 30i of the engagement device, and the other pressure-bearing side abuts against the tooth side of the outer convex tooth 30k of the third-speed electric finger engagement device; the buffer plate 30j of the third-speed electric finger engagement device is far away from the end face of the input gear 5 There are also two center-symmetrically distributed arc-shaped ring grooves of 30m for the third-speed electric finger joint device; the width of the arc-shaped ring groove 30m of each third-speed electric finger joint device is the same The diameter of the first electric finger pin 30d and the diameter of the second electric finger pin 30g of the third gear electric finger joint device are all equal; The distance from the axis of the first electric finger 30d of the electric finger joint device to the axis of the input disk 30a of the third-speed electric finger joint device, the axis of the second electric finger 30g of the third-speed electric finger joint device to the axis of the third-speed electric finger The distances between the axes of the input disk shaft 30a of the pin engaging device are equal; the central angle corresponding to the arc-shaped ring groove 30m of each third-gear electric finger-pin engaging device is 90°; the arc-shaped ring of each third-gear electric finger engaging device The depth of one end of the slot 30m is equal to the maximum extension length of the first electric finger 30d of the third-speed electric finger joint device, and the maximum extension length of the second electric finger 30g of the third-speed electric finger joint device. The depth of the other end of the arc-shaped ring groove 30m of the electric finger joint device is zero, and the depth of the middle part of the arc-shaped ring groove 30m of each third-speed electric finger joint device gradually transitions smoothly.

There is always a certain gap between the end surface of the buffer disk 30j of the third-speed electric finger joint device away from the input gear 5 and the end surface of the input disk 30a of the third-speed electric finger joint device close to the input gear 5 .

The working principle of the electric finger joint device type three-speed automatic transmission for electric vehicles is further described below in conjunction with the embodiments:

An electric slip ring is fixedly installed on the outer cylindrical surface of the input disc 10a of the first-gear electric finger engagement device, and the first electromagnetic coil 10c and the first-gear electric finger engagement device of the first-gear electric finger engagement device are controlled by the electric slip ring and the external brush. The energization and de-energization of the second electromagnetic coil 10f of the pin engagement device; similarly, an electric slip ring is fixedly installed on the outer cylindrical surface of the input disc 20a of the second gear electric finger engagement device, and the two coils are controlled by the electric slip ring and the external brush. The energization and de-energization of the first electromagnetic coil 20c of the first gear electric finger joint device and the second electromagnetic coil 20f of the second gear electric finger joint device; An electric slip ring is fixedly installed on it, and the power-on and power-off of the first electromagnetic coil 30c of the third-speed electric finger joint device and the second electromagnetic coil 30f of the third-speed electric finger joint device are controlled by the electric slip ring and external brushes.

When first-speed transmission, the first electromagnetic coil 10c of the first-speed electric finger joint device and the second electromagnetic coil 10f of the first-speed electric finger joint device are energized, and the first electromagnetic coil 10c of the first-speed electric finger joint device and the first-speed electric finger joint device are energized. The magnetic field force generated by the second electromagnetic coil 10f of the electric finger engagement device makes the first electric finger 10d of the first-speed electric finger engagement device and the second electric finger 10g of the first-speed electric finger engagement device overcome the force of the return spring. The elastic force moves to the direction of the output disk 10h of the first-speed electric finger joint device, and the first electric finger 10d of the first-speed electric finger joint device and the second electric finger 10g of the first-speed electric finger joint device are rotating. state slides into one end of the arc-shaped ring groove 10m of the first-gear electric finger-pin engagement device, thereby driving the buffer plate 10j of the first-gear electric finger-pin engagement device to rotate synchronously, and at the same time due to the The tooth flank abuts against one pressure-bearing side of the rubber spring element 10n of the first-gear electric finger engagement device, and the other pressure-bearing side of the rubber spring element 10n of the first-gear electric finger engagement device abuts against the first-gear electric finger engagement device. On the tooth flanks of the inner convex teeth 10i of the pin engaging device, therefore, the buffer disc 10j of the first-gear electric finger engaging device rotates synchronously with the output disc 10h of the first-gear electric finger engaging device, so that the first-gear electric finger engaging device The input disc 10a of the first gear is synchronously driven with the output disc 10h of the first gear electric finger joint device.

During the second gear transmission, the first electromagnetic coil 20c of the second-speed electric finger joint device and the second electromagnetic coil 20f of the second-speed electric finger joint device are energized, and the first electromagnetic coil 20c of the second-speed electric finger joint device and the second-speed electric finger joint device are energized. The magnetic field force generated by the second electromagnetic coil 20f of the electric finger engagement device makes the first electric finger 20d of the second-speed electric finger engagement device and the second electric finger 20g of the second-speed electric finger engagement device overcome the force of the return spring. The elastic force moves to the direction of the output disk 20h of the second-speed electric finger joint device, and the first electric finger 20d of the second-speed electric finger joint device and the second electric finger 20g of the second-speed electric finger joint device are rotating. state slides into one end of the arc-shaped ring groove 20m of the second-speed electric finger joint device, thereby driving the buffer plate 20j of the second-speed electric finger joint device to rotate synchronously, and at the same time due to the outer convex teeth 20k of the second-speed electric finger joint device The tooth flank abuts against one pressure-bearing side of the rubber spring element 20n of the second-speed electric finger engagement device, and the other pressure-bearing side of the rubber spring element 20n of the second-speed electric finger engagement device abuts against the second-speed electric finger engagement device. Therefore, the buffer plate 20j of the second-speed electric finger-pin jointer rotates synchronously with the output plate 20h of the second-speed electric finger-pin jointer, so that the second-speed electric finger-pin jointer The input disc 20a and the output disc 20h of the second gear electric finger joint device are synchronously driven.

During the third gear transmission, the first electromagnetic coil 30c of the third gear electric finger joint device and the second electromagnetic coil 30f of the third gear electric finger joint device are energized, and the first electromagnetic coil 30c of the third gear electric finger joint device and the third gear The magnetic field force generated by the second electromagnetic coil 30f of the electric finger joint device makes the first electric finger 30d of the third-speed electric finger joint device and the second electric finger 30g of the third-speed electric finger joint device overcome the force of the return spring. The elastic force moves toward the output plate 30h of the third-speed electric finger joint device, and the first electric finger 30d of the third-speed electric finger joint device and the second electric finger 30g of the third-speed electric finger joint device are rotating. state slides into one end of the arc-shaped ring groove 30m of the third-gear electric finger-pin engagement device, thereby driving the buffer plate 30j of the third-gear electric finger-pin engagement device to rotate synchronously, and at the same time due to the outer convex teeth 30k of the third-gear electric finger-pin engagement device The tooth flank abuts against one pressure-bearing side of the rubber spring element 30n of the third-gear electric finger engagement device, and the other pressure-bearing side of the rubber spring element 30n of the third-gear electric finger engagement device abuts against the third-gear electric finger engagement device. On the tooth flanks of the inner convex teeth 30i of the pin engaging device, therefore, the buffer plate 30j of the third-speed electric finger pin engaging device rotates synchronously with the output disc 30h of the third-speed electric finger engaging device, so that the third-speed electric finger engaging device The input disc 30a and the output disc 30h of the three-speed electric finger joint device are synchronously driven.

The transmission line of the first gear is as follows: the first gear electric finger joint device 10 is energized and engaged, the second gear electric finger joint device 20 and the third gear electric finger joint device 30 are powered off and separated, and the torque of the power device is transmitted to the transmission through the transmission input shaft 41. The input gear 5, the input gear 5 further transmits the torque to the first gear input gear 6, and then through the engaged first gear electric finger engagement device 10, the power is transmitted to The transmission shaft 30p of the third-gear electric finger-pin engagement device outputs power through the transmission shaft 30p of the third-gear electric finger-pin engagement device to realize first-gear transmission.

The transmission line of the second gear is as follows: the second gear electric finger joint device 20 is energized and engaged, the first gear electric finger joint device 10 and the third gear electric finger joint device 30 are powered off and separated, and the torque of the power device is transmitted to the transmission through the transmission input shaft 41. The input gear 5, the input gear 5 further transmits the torque to the second gear input gear 7, and then through the engaged second gear electric finger pin engagement device 20, the power is transmitted to The transmission shaft 30p of the third-gear electric finger-pin engagement device outputs power through the transmission shaft 30p of the third-gear electric finger-pin engagement device to realize the second-gear transmission.

The transmission line of the third gear is: the third gear electric finger joint device 30 is energized and engaged, the first gear electric finger joint device 10 and the second gear electric finger joint device 20 are de-energized and separated, and the torque of the power device is transmitted to the transmission through the transmission input shaft 41 Input gear 5, and the input gear 5 transmits the power to the drive shaft 30p of the third-gear electric finger joint device through the engaged third-gear electric finger joint device 30, and then outputs the power through the transmission shaft 30p of the third-gear electric finger joint device Power realizes the third gear transmission, because there is no gear transmission in the third gear transmission route, so the third gear is a direct gear again.

The transmission route of the reverse gear is as follows: the first gear electric finger engagement device 10 is energized and engaged, the second gear electric finger engagement device 20 and the third gear electric finger engagement device 30 are de-energized and separated, the power device is reversed, and the torque is passed through the transmission input shaft 41 is transmitted to the input gear 5, and the input gear 5 further transmits the torque to the first-speed input gear 6, and then through the engaged first-speed electric finger engagement device 10, the first-speed driving gear 8a and the first-speed driven gear 8b are meshed. The power is transmitted to the transmission shaft 30p of the third-gear electric finger engagement device, and the power is output outward through the transmission shaft 30p of the third-gear electric finger engagement device to realize reverse gear transmission.

Neutral gear: the first electromagnetic coil 10c of the first-speed electric finger joint device, the second electromagnetic coil 10f of the first-speed electric finger joint device, the first electromagnetic coil 20c of the second-speed electric finger joint device, and the second-speed electric finger joint The second electromagnetic coil 20f of the engaging device, the first electromagnetic coil 30c of the third-speed electric finger engaging device, and the second electromagnetic coil 30f of the third-speed electric finger engaging device are all in a power-off state, realizing neutral gear.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Various changes are made.

Claims (1)

1. A three-speed automatic transmission for electric vehicles with an electric finger pin joint device, comprising a transmission input shaft (41), an input gear (5), a first gear input gear (6), a second gear input gear (7), a first gear driving gear gear (8a), first gear driven gear (8b), second gear driving gear (9a), second gear driven gear (9b); the input gear (5) is fixedly mounted on the transmission input shaft (41); the The input gear (5) is in constant mesh with the first-gear input gear (6) and the second-gear input gear (7) along the circumferential outer side of the gear; it is characterized in that: It also includes a first gear electric finger joint device (10), a second gear electric finger joint device (20) and a third gear electric finger joint device (30); The first-gear electric finger engagement device (10) comprises an input disc (10a) of the first-gear electric finger engagement device, a first electric finger valve (10b) of the first-gear electric finger engagement device, a first-gear electric finger engagement device The second electric finger pin valve (10e) of the engaging device, the output disc (10h) of the electric finger engaging device of the first speed, the inner convex tooth (10i) of the electric finger engaging device of the first speed, the Buffer plate (10j), outer convex teeth (10k) of the first-speed electric finger joint device, arc-shaped ring groove (10m) of the first-speed electric finger joint device, rubber spring element (10n) of the first-speed electric finger joint device ), the transmission shaft (10p) of the first gear electric finger engagement device; The second-speed electric finger joint device (20) includes an input plate (20a) of the second-speed electric finger joint device, a first electric finger valve (20b) of the second-speed electric finger joint device, and a second-speed electric finger joint device. The second electric finger pin valve (20e) of the engaging device, the output plate (20h) of the second-speed electric finger engaging device, the inner convex tooth (20i) of the second-speed electric finger engaging device, the Buffer plate (20j), outer convex teeth (20k) of the second-speed electric finger joint device, arc-shaped ring groove (20m) of the second-speed electric finger joint device, rubber spring element (20n) of the second-speed electric finger joint device ), the transmission shaft (20p) of the second gear electric finger joint device; The third-speed electric finger joint device (30) includes an input plate (30a) of the third-speed electric finger joint device, a first electric finger valve (30b) of the third-speed electric finger joint device, and a third-speed electric finger joint device. The second electric finger pin valve (30e) of the engaging device, the output disc (30h) of the third-speed electric finger engaging device, the inner convex tooth (30i) of the third-speed electric finger engaging device, the Buffer plate (30j), external convex teeth (30k) of third-speed electric finger joint device, arc-shaped ring groove (30m) of third-speed electric finger joint device, rubber spring element (30n) of third-speed electric finger joint device ), the transmission shaft (30p) of the third gear electric finger joint device; One end face of the output disc (10h) of the first-gear electric finger engagement device is fixedly connected to one end face of the first-gear input gear (6); the first-gear input gear (6) is rollingly mounted on the first-gear electric finger on the drive shaft (10p) of the pin joint; The first electric finger valve (10b) of the first-speed electric finger joint device and the second electric finger valve of the first-speed electric finger joint device are symmetrically installed on the input disk (10a) of the first-speed electric finger joint device (10e); the first electric finger valve (10b) of the first-gear electric finger engagement device includes the first electromagnetic coil (10c) of the first-gear electric finger engagement device and the first electromagnetic coil (10c) of the first-gear electric finger engagement device. The electric finger (10d); the first electric finger (10d) of the first gear electric finger engagement device is fixedly installed at one end of the iron core of the first electric finger valve (10b) of the first gear electric finger engagement device; The second electric finger valve (10e) of the first-gear electric finger engagement device includes the second electromagnetic coil (10f) of the first-gear electric finger engagement device and the second electric finger (10f) of the first-gear electric finger engagement device ( 10g); the second electric finger (10g) of the first gear electric finger engagement device is fixedly installed at one end of the iron core of the second electric finger pin valve (10e) of the first gear electric finger engagement device; The output disc (10h) of the first gear electric finger joint device is provided with an L-shaped annular cavity on the end face away from the first gear input gear (6), and a buffer disc (10j) of the first gear electric finger joint device is installed in the cavity. ) and a plurality of rubber spring elements (10n) of the first gear electric finger engagement device; the outer convex teeth of the first gear electric finger engagement device on the outer cylindrical surface of the buffer disc (10j) of the first gear electric finger engagement device A rubber spring element (10n) of a first-gear electric finger engagement device is respectively installed between (10k) and the inner convex teeth (10i) of the first-gear electric finger engagement device in the L-shaped annular cavity; One pressure-bearing side of the rubber spring element (10n) of the finger engagement device abuts against the tooth flank of the inner convex tooth (10i) of the first-gear electric finger engagement device, and the other pressure-bearing side abuts against the first-gear electric finger engagement The tooth flanks of the outer convex teeth (10k) of the device; the buffer plate (10j) of the first-gear electric finger engagement device is further provided with two center-symmetrically distributed first-gear electric fingers on the end face far away from the first-gear input gear (6). The arc-shaped annular groove (10m) of the pin engaging device; the width of the arc-shaped annular groove (10m) of each first-gear electric finger engaging device is the same as that of the first electric finger (10d) of the first-gear electric finger engaging device The diameter of the second electric finger (10g) of the first gear electric finger engagement device is equal; Distance from the axis of the first electric finger (10d) of the electric finger joint to the axis of the input disk (10a) of the electric finger joint of the first gear, the second electric finger (10g) of the electric finger joint of the first gear The distance from the axis to the axis of the input disc shaft (10a) of the first-gear electric finger joint device is equal; the central angle corresponding to the arc-shaped ring groove (10m) of each first-gear electric finger joint device is 90-180° ; The depth at both ends of the arc-shaped ring groove (10m) of each first-grade electric finger engaging device is the same as the maximum extension length of the first electric finger (10d) of the first-grade electric finger engaging device, the first-grade electric finger The maximum protruding length of the second electric finger (10g) of the pin engagement device is equal, the middle depth of the arc-shaped ring groove (10m) of each first-gear electric finger engagement device is zero, and each first-gear electric finger engagement The depth of the remaining part of the arc-shaped ring groove (10m) of the device gradually and smoothly transitions; The end surface of the buffer disc (10j) of the first-gear electric finger engagement device away from the first-gear input gear (6) is connected to the end surface of the first-gear electric finger engagement device's input disc (10a) close to the first-gear input gear (6) Always maintain a certain gap on one end face; One end face of the output disc (20h) of the second-gear electric finger engagement device is fixedly connected to one end face of the second-gear input gear (7); the second-gear input gear (7) is rollingly mounted on the second-gear electric finger on the drive shaft (20p) of the pin joint; The first electric finger valve (20b) of the second-speed electric finger joint device and the second electric finger of the second-speed electric finger joint device are symmetrically installed on the input plate (20a) of the second-speed electric finger joint device. valve (20e); the first electric finger valve (20b) of the second-speed electric finger engagement device includes the first electromagnetic coil (20c) of the second-speed electric finger engagement device and the first electromagnetic coil (20c) of the second-speed electric finger engagement device An electric finger (20d); the first electric finger (20d) of the second-speed electric finger engagement device is fixedly installed at one end of the iron core of the first electric finger valve (20b) of the second-speed electric finger engagement device The second electric finger valve (20e) of the second gear electric finger engagement device includes the second electromagnetic coil (20f) of the second gear electric finger engagement device and the second electric finger of the second gear electric finger engagement device (20g); the second electric finger pin (20g) of the second gear electric finger engagement device is fixedly installed on one end of the iron core of the second electric finger pin valve (20e) of the second gear electric finger engagement device; The output disk (20h) of the second-gear electric finger joint device is provided with an L-shaped annular cavity on the end face away from the second-gear input gear (7), and the buffer disc (20h) of the second-gear electric finger joint device is installed in the cavity. 20j) and a plurality of rubber spring elements (20n) of the second-gear electric finger engagement device; A rubber spring element (20n) of the second-gear electric finger-pin engagement device is respectively installed between the teeth (20k) and the inner convex teeth (20i) of the second-gear electric finger-pin engagement device in the L-shaped annular cavity; each second-gear One pressure-bearing side of the rubber spring element (20n) of the electric finger pin engagement device abuts against the tooth flank of the inner convex tooth (20i) of the second-speed electric finger-pin engagement device, and the other pressure-bearing side abuts against the second-speed electric finger pin The tooth flanks of the outer convex teeth (20k) of the engaging device; the buffer disk (20j) of the second-gear electric finger-pin engaging device is further provided with two center-symmetrically distributed second-gear electric The arc-shaped annular groove (20m) of the finger engaging device; the width of the arc-shaped annular groove (20m) of each second-gear electric finger engaging device is the same as the first electric finger (20d) of the second-gear electric finger engaging device ) and the diameter of the second electric finger (20g) of the second-gear electric finger engagement device are equal; The distance from the axis of the first electric finger (20d) of the second-speed electric finger joint device to the axis of the input disk (20a) of the second-speed electric finger joint device, and the second electric finger (20g) of the second-speed electric finger joint device ) axis to the axis of the input disc shaft (20a) of the second-gear electric finger engagement device is equal; the central angle corresponding to the arc-shaped ring groove (20m) of each second-gear electric finger engagement device is 60-150 °; the depth of one end of the arc-shaped ring groove (20m) of each second-gear electric finger engaging device is the same as the maximum extension length of the first electric finger (20d) of the second-gear electric finger engaging device, the second-gear electric finger The maximum protruding length of the second electric finger (20g) of the pin engaging device is equal, the depth of the other end of the arc-shaped ring groove (20m) of each second-gear electric finger engaging device is zero, and each second-gear electric finger The depth of the middle part of the arc-shaped annular groove (20m) of the pin joint device gradually and smoothly transitions; One end surface of the buffer disc (20j) of the second-gear electric finger joint device away from the second-gear input gear (7) and the end face of the second-gear electric finger joint device's input disc (20a) close to the second-gear input gear (7) Always maintain a certain gap on one end face; One end face of the output disc (30h) of the third gear electric finger joint device is fixedly connected to one end face of the input gear (5); The first electric finger valve (30b) of the third-speed electric finger joint device and the second electric finger valve of the third-speed electric finger joint device are symmetrically installed on the input plate (30a) of the third-speed electric finger joint device (30e); the first electric finger valve (30b) of the three-speed electric finger joint device includes the first electromagnetic coil (30c) of the three-speed electric finger joint device and the first electromagnetic coil (30c) of the three-speed electric finger joint device. Electric finger (30d); the first electric finger (30d) of the third-gear electric finger engagement device is fixedly installed at one end of the iron core of the first electric finger valve (30b) of the third-gear electric finger engagement device; The second electric finger valve (30e) of the three-speed electric finger engagement device includes the second electromagnetic coil (30f) of the three-speed electric finger engagement device and the second electric finger (30f) of the three-speed electric finger engagement device ( 30g); the second electric finger (30g) of the third-gear electric finger engagement device is fixedly installed on one end of the iron core of the second electric finger valve (30e) of the third-gear electric finger engagement device; The output disc (30h) of the third-gear electric finger joint device is provided with an L-shaped annular cavity on the end face away from the input gear (5), and the buffer disc (30j) and the third-gear electric finger joint device are installed in the cavity. A plurality of rubber spring elements (30n) of the third-speed electric finger joint device; the outer convex teeth (30k) of the third-speed electric finger joint device on the outer cylindrical surface of the buffer plate (30j) of the third-speed electric finger joint device ) and the inner convex teeth (30i) of the third-gear electric finger engagement device in the L-shaped annular cavity are respectively installed with a rubber spring element (30n) of the third-gear electric finger engagement device; each third-gear electric finger One pressure-bearing side of the rubber spring element (30n) of the engagement device abuts against the tooth flank of the inner convex tooth (30i) of the third-speed electric finger pin engagement device, and the other pressure-bearing side abuts against the tooth flank of the third-speed electric finger pin engagement device. The tooth flanks of the externally convex teeth (30k); the buffer plate (30j) of the third-gear electric finger-pin engagement device is further provided with two center-symmetrically distributed third-gear electric finger-pin engagement devices on the end face away from the input gear (5). Arc-shaped ring groove (30m); the width of the arc-shaped ring groove (30m) of each third-gear electric finger engaging device is the same as the diameter of the first electric finger (30d) of the third-gear electric finger engaging device, three The diameters of the second electric fingers (30g) of the third-gear electric finger engagement device are all equal; Distance from the axis of the first electric finger (30d) of the device to the axis of the input disc (30a) of the third-speed electric finger engagement device, the axis of the second electric finger (30g) of the third-speed electric finger engagement device to the third gear The distances between the axes of the input disk shafts (30a) of the electric finger joint device are equal; the central angle corresponding to the arc-shaped ring groove (30m) of each of the three-speed electric finger joint devices is 60-150°; The depth of one end of the arc-shaped ring groove (30m) of the three-speed electric finger joint device is the same as the maximum extension length of the first electric finger (30d) of the third-speed electric finger joint device, and the first electric finger joint (30d) of the third-speed electric finger joint device. The maximum protruding lengths of the two electric finger pins (30g) are equal, the depth of the other end of the arc ring groove (30m) of each third-gear electric finger-pin engaging device is zero, and the arc-shaped ring groove (30m) of each third-gear electric finger engaging device The depth of the middle part of the annular groove (30m) gradually and smoothly transitions; The end surface of the buffer disk (30j) of the third-speed electric finger joint device away from the input gear (5) is always connected with the end surface of the input disk (30a) of the third-speed electric finger joint device close to the input gear (5). Keep some clearance.