Compact electric drive system gear shifting mechanism

Abstract

The invention belongs to the technical field of vehicle electric driving, and particularly relates to a compact electric driving system gear shifting mechanism which comprises a voice coil motor, a motor mounting plate, a connecting swing rod, a self-locking mechanism, a grating reading head, a grating ruler, a U-shaped groove and a self-locking pin. The executing mechanism comprises a rotating shaft, a shifting fork, a sliding block, a left side combination gear sleeve, a right side combination gear sleeve, a middle hub and a combination sleeve. According to the working principle, the actuating mechanism forms a swing angle, the synchronizer is driven to work by connecting the swing rod and the rotating shaft, and a first gear, a neutral gear and a second gear can be achieved. Specifically, a voice coil motor pushes a motor mounting plate, the motor mounting plate is rotationally connected with a swing rod, the swing rod is connected with a rotating shaft to be fixed, and the rotating shaft is driven to rotate; the rotating shaft rotates to drive a shifting fork to swing left and right; and the synchronizer combination sleeve is connected with the left side combination gear sleeve and the right side combination gear sleeve by moving left and right, so that the gear engaging operation of a low gear, a high gear and a neutral gear is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle electric drive, and particularly relates to a shifting mechanism for a compact electric drive system. Background Art

[0002] The power source of new energy vehicles is required to output large torque at low speed and constant power at high speed. If the electric drive system of new energy vehicles uses a drive motor and a fixed-ratio reducer, the requirements for the torque and speed of the drive motor are relatively high, the drive motor has a large volume, is difficult to control, has low efficiency, and high cost. By using a drive motor and a transmission with several gears, the volume and cost of the drive motor can be significantly reduced, and the efficiency of the working area of the drive motor can be improved. However, the transmission with several gears increases the design difficulty of the mechanical system, especially the design of the shifting mechanism for a highly compact electric drive system is crucial. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] The technical problem to be solved by the present invention is: how to provide a highly integrated shifting mechanism for an electric drive system. The electric drive system of new energy vehicles consists of a drive motor and a transmission, which requires high power density and wide speed range torque output. The high integration of the shifting mechanism with the drive motor and the transmission can significantly improve the power density of the electric drive system.

[0005] (2) Technical Solutions

[0006] To solve the above technical problems, the present invention provides a shifting mechanism for a compact electric drive system, which includes an actuating mechanism 1 and an executing mechanism 2;

[0007] The actuating mechanism 1 includes: a voice coil motor 3, a motor mounting plate 4, a connecting swing rod 5, a self-locking mechanism 6, a grating head 7, a grating scale 8, a U-shaped groove 9, and a self-locking pin 10;

[0008] The executing mechanism 2 includes: a rotating shaft 12, a fork 13, a slider 14, a left engaging sleeve 15, a right engaging sleeve 16, an intermediate hub 17, and a coupling sleeve 18. Among them, the left engaging sleeve 15, the right engaging sleeve 16, the intermediate hub 17, and the coupling sleeve 18 are collectively referred to as a synchronizer;

[0009] The actuating mechanism 1 forms a swing angle, and drives the synchronizer to work through the connecting swing rod 5 and the rotating shaft 12, so as to realize three positions: gear one, neutral, and gear two;

[0010] The specific process is as follows: The voice coil motor 3 pushes the motor mounting plate 4. The motor mounting plate 4 is rotatably connected to the swing rod 5. The swing rod 5 is fixed to the rotating shaft 12, driving the rotating shaft 12 to rotate. The rotation of the rotating shaft 12 drives the fork 13 to swing left and right. At this time, the slider 14 on the fork 13 pushes the synchronizer sleeve 18, causing it to move left and right to complete the connection between the synchronizer sleeve 18 and the left engagement sleeve 15 or the right engagement sleeve 16, thereby realizing the gear shifting operations of the first gear, neutral gear, and second gear.

[0011] The motor mounting plate 4 is provided with three U-shaped grooves 9, corresponding to the positions of the first gear, neutral gear, and second gear of the synchronizer respectively. The self-locking mechanism 6 pushes the self-locking pin 10 into or out of the U-shaped groove 9 to achieve locking or unlocking of the position, preventing deviation during locking.

[0012] The motor mounting plate 4 is equipped with a grating reader 7, and the grating scale 8 is fixed to the base, used to detect the position of the movement of the motor mounting plate 4, thereby controlling the action of the self-locking mechanism 6 to push the self-locking pin 10 into the U-shaped groove.

[0013] The fork 13 together with the slider 14 drives the sleeve 18 to move to the left and connect with the left engagement sleeve 15 to form the first gear, defined as the low gear. The fork 13 together with the slider 14 drives the sleeve 18 to move to the right and connect with the right engagement sleeve 16 to form the second gear, defined as the high gear. When the sleeve 18 is in the middle position, it is in neutral gear.

[0014] The mechanism combines the voice coil motor with the synchronizer, and realizes gear shifting through the rotation of the connecting swing rod. It has a high structural integration degree and smooth gear shifting.

[0015] The mechanism combines the shifting motor and the synchronizer, and can be highly integrated with the electric drive system body, making the gear shifting process smoother and having significant application prospects.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention adopts the combination of a voice coil motor and a synchronizer. Through the connecting swing rod and the rotating shaft as the transmission parts of the voice coil motor and the synchronizer, the actuating mechanism such as the voice coil motor is placed outside the synchronizer, without occupying the axial space of the drive motor and the transmission, facilitating the realization of a compact structure of the electric drive system and reducing the volume and weight of the electric drive system. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the composition of a compact electric drive system shifting mechanism of the present invention.

[0019] Figure 2 It is a schematic diagram of the composition of the actuating mechanism of the present invention.

[0020] Figure 3It is a schematic diagram of the actuator composition of the present invention. Specific Embodiments

[0021] To make the objectives, content, and advantages of the present invention clearer, the following further describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments.

[0022] To solve the above technical problems, the present invention provides a compact electric drive system shift mechanism, which includes an actuating mechanism 1 and an actuator 2;

[0023] The actuating mechanism 1 includes: a voice coil motor 3, a motor mounting plate 4, a connecting swing rod 5, a self-locking mechanism 6, a grating reader 7, a grating scale 8, a U-shaped groove 9, and a self-locking pin 10;

[0024] The actuator 2 includes: a rotating shaft 12, a fork 13, a slider 14, a left coupling sleeve 15, a right coupling sleeve 16, an intermediate hub 17, and a coupling sleeve 18. Among them, the left coupling sleeve 15, the right coupling sleeve 16, the intermediate hub 17, and the coupling sleeve 18 are collectively referred to as a synchronizer;

[0025] The actuating mechanism 1 forms a swing angle, and drives the synchronizer to work through the connecting swing rod 5 and the rotating shaft 12, thereby realizing three positions: first gear, neutral gear, and second gear;

[0026] Specifically as follows: The voice coil motor 3 pushes the motor mounting plate 4. The motor mounting plate 4 is rotatably connected to the swing rod 5. The swing rod 5 is fixed to the rotating shaft 12 to drive the rotating shaft 12 to rotate. The rotation of the rotating shaft 12 drives the fork 13 to swing left and right. At this time, the slider 14 on the fork 13 pushes the engaging sleeve 18 of the synchronizer to move it left and right to complete the connection between the engaging sleeve 18 of the synchronizer and the left coupling sleeve 15 or the right coupling sleeve 16, thereby realizing the gear shifting operations of first gear, neutral gear, and second gear.

[0027] The motor mounting plate 4 is provided with three U-shaped grooves 9, which respectively correspond to the positions of the first gear, neutral gear, and second gear of the synchronizer. The self-locking mechanism 6 pushes the self-locking pin 10 into or out of the U-shaped groove 9 to realize locking or unlocking the position, and prevent deviation when locked.

[0028] The motor mounting plate 4 is installed with a grating reader 7, and the grating scale 8 is fixed to the base, which is used to detect the position of the movement of the motor mounting plate 4, so as to control the action of the self-locking mechanism 6 and push the self-locking pin 10 into the U-shaped groove.

[0029] The fork 13 together with the slider 14 drives the engaging sleeve 18 to move to the left and connect with the left coupling sleeve 15 to form the first gear, which is defined as the low gear. The fork 13 together with the slider 14 drives the engaging sleeve 18 to move to the right and connect with the right coupling sleeve 16 to form the second gear, which is defined as the high gear. When the engaging sleeve 18 is in the middle position, it is in neutral gear.

[0030] The mechanism combines a voice coil motor with a synchronizer and realizes gear shifting by the rotation of a connecting swing rod, featuring high structural integration and smooth gear shifting.

[0031] The mechanism adopts the combination of a shifting motor and a synchronizer, which can be highly integrated with the main body of the electric drive system, making the shifting process smoother and having significant application prospects.

[0032] The present invention will be described in detail below with reference to specific embodiments.

[0033] Embodiment

[0034] A gear shifting mechanism of a compact electric drive system according to this embodiment is as Figure 1 shown. If the required static gear shifting force is 1500 N, according to the characteristics of the selected synchronizer, the effective force arm length of the fork is 70 mm, and the unilateral stroke is 10 mm. The effective force arm length of the designed connecting swing rod is 50 mm. According to the lever theory, the required output thrust at the voice coil motor end is 2100 N, and the unilateral output stroke needs to be 7.14 mm. According to the positions corresponding to the first gear, the second gear, and the neutral gear, the position of the U-shaped groove is designed, and the positions of the grating scales corresponding to the three positions are recorded by a grating head and a grating, and a self-locking mechanism is designed.

[0035] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A compact electric drive system shift mechanism, characterized in that: It comprises an actuating mechanism (1) and an executing mechanism (2); The actuating mechanism (1) comprises: a voice coil motor (3), a motor mounting plate (4), a connecting rocker (5), a self-locking mechanism (6), a grating reader (7), a grating ruler (8), a U-shaped groove (9), and a self-locking pin (10); The actuator (2) comprises: a rotating shaft (12), a shift fork (13), a slider (14), a left-side combined gear sleeve (15), a right-side combined gear sleeve (16), an intermediate hub (17) and a combined sleeve (18), wherein the left-side combined gear sleeve (15), the right-side combined gear sleeve (16), the intermediate hub (17) and the combined sleeve (18) are collectively referred to as a synchronizer; The actuating mechanism (1) forms a swing angle, and drives the synchronizer to work by connecting the swing rod (5) and the rotating shaft (12), thereby realizing three positions: gear position 1, neutral gear, and gear position 2; Specifically, the voice coil motor (3) pushes the motor mounting plate (4), the motor mounting plate (4) rotates the connecting rocker (5), the connecting rocker (5) is fixed to the rotating shaft (12), and drives the rotating shaft (12) to rotate. The rotation of the rotating shaft (12) drives the shift fork (13) to swing left and right. At this time, the slider (14) on the shift fork (13) pushes the synchronizer coupling sleeve (18), so that it moves left and right to complete the connection between the synchronizer coupling sleeve (18) and the left coupling gear sleeve (15) or the right coupling gear sleeve (16), thereby realizing the gear shifting operation of the first gear, the neutral gear, and the second gear.

2. The compact electric drive system shift mechanism according to claim 1, characterized in that: The motor mounting plate (4) is provided with three U-shaped grooves (9), which respectively correspond to the synchronizer gear position 1, neutral gear, and gear position 2. The self-locking mechanism (6) pushes the self-locking pin (10) into or out of the U-shaped groove (9) to achieve locking or unlocking the position, and prevents displacement when locked.

3. The compact electric drive system shift mechanism according to claim 2, characterized in that: The motor mounting plate (4) is equipped with a grating reader (7), and a grating ruler (8) is fixed to the base for detecting the moving position of the motor mounting plate (4), thereby controlling the action of the self-locking mechanism (6) and pushing the self-locking pin (10) into the U-shaped groove.

4. The compact electric drive system shift mechanism according to claim 3, characterized in that: The shift fork (13) together with the slider (14) drives the coupling sleeve (18) to move to the left side and connects with the left coupling gear sleeve (15) to form a first gear position, which is defined as resistance.

5. The compact electric drive system shift mechanism according to claim 4, characterized in that: The shift fork (13) together with the slider (14) drives the coupling sleeve (18) to move to the right side and connects with the right coupling gear sleeve (16) to form a second gear position, which is defined as a high gear.

6. The compact electric drive system shift mechanism according to claim 5, characterized in that: When the coupling sleeve (18) is in the middle position, it is in neutral.

7. The compact electric drive system shift mechanism according to claim 6, characterized in that: The mechanism combines the voice coil motor with the synchronizer, realizes gear switching by rotating the connecting rocker, has high structural integration and smooth gear shifting.

8. The compact electric drive system shift mechanism according to claim 7, characterized in that: The mechanism adopts a combination of a shift motor and a synchronizer, and can be highly integrated with the electric drive system body, making the shift process smoother, and has significant application prospects.

9. The compact electric drive system shift mechanism according to claim 7, characterized in that: The mechanism belongs to the technical field of vehicle electric drive.

10. The compact electric drive system shift mechanism according to claim 7, characterized in that: The mechanism adopts a combination of a voice coil motor and a synchronizer. By connecting a rocker arm and a rotating shaft as transmission parts between the voice coil motor and the synchronizer, the voice coil motor is placed outside the synchronizer as an actuating mechanism, which does not occupy the axial space of the drive motor and the transmission, facilitates the realization of a compact structure of the electric drive system, and reduces the volume and weight of the electric drive system.

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