Electric gear shifting executing mechanism and electric bridge driving system

Abstract

The utility model provides an electric gear shifting executing mechanism and a bridge driving system. The electric gear shifting executing mechanism can prevent the position of a nut on a screw from changing in the transportation process of the electric gear shifting executing mechanism. The electric gear shifting executing mechanism comprises a shell, a lead screw and a fixing component, wherein the fixing component comprises a bottom; the first leg part and the second leg part respectively extend from the bottom part along a first direction branch; and a first groove portion located between the first leg portion and the second leg portion and extending in the first direction, the nut including: a nut body portion; and a nut wing portion extending in a second direction from an outer peripheral surface of one end portion of the nut body portion, the nut wing portion being in a plate shape having a thickness in a third direction, the first direction, the second direction, and the third direction being perpendicular to each other, the screw extending in the third direction, and both ends of the fixing member in the third direction being in contact with an inner wall of the housing, respectively. The first groove part is fixedly arranged on the outer surface of the wing part of the nut in a sleeving mode, and the fixing component fixes the position of the nut on the screw.

Description

Technical Field

[0001] The present application relates to an electric shift actuator, and particularly to an electric shift actuator and an e-Axle drive system for fixing the position of a nut on a lead screw during the transportation of the electric shift actuator. Background Art

[0002] The e-Axle drive system is widely used in electric vehicles and the like. The e-Axle drive system may include an electric shift actuator. The electric shift actuator includes a motor, a pinion gear, a crown gear, a ball screw, a shift fork, and the like.

[0003] When the electric shift actuator works, the motor drives the motor shaft to rotate, transmits the torque to the pinion gear, and then to the crown gear, the screw, and the nut. The screw drives the nut to move linearly. When the nut moves linearly, it drives the shift fork to move, thereby performing the shift actuation function.

[0004] During the transportation of the electric shift actuator, there is a situation where the position of the nut on the screw changes. This situation will affect subsequent assembly and the like. Summary of the Utility Model

[0005] The purpose of the present application is to provide an electric shift actuator and an e-Axle drive system that can prevent the position of the nut on the screw from changing during the transportation of the electric shift actuator.

[0006] According to the present application, there is provided an electric shift actuator, which includes: a housing; a lead screw received in the housing, the lead screw including a nut and a screw; and a fixing member detachably mounted on the housing, the fixing member including: a bottom; a first leg and a second leg respectively extending from the bottom along a first direction; and a first groove portion located between the first leg and the second leg and extending along the first direction, the nut including: a nut main body portion; and a nut wing portion extending from the outer peripheral surface of one end of the nut main body portion along a second direction, the nut wing portion being a plate-like shape having a thickness in a third direction, the first direction, the second direction, and the third direction being perpendicular to each other, the screw extending in the third direction, both ends of the fixing member in the third direction respectively abutting against the inner wall of the housing, and the first groove portion being sleeved and fixed on the outer surface of the nut wing portion, so that the fixing member fixes the position of the nut on the screw.

[0007] In at least one embodiment, the fixing member further has a third leg extending from the bottom along the first direction, and a second groove portion is provided between the second leg and the third leg.

[0008] In at least one embodiment, the electric shift actuator includes an anti-rotation pin for preventing the nut from rotating. In the first direction, a hook portion is provided at the extended top end of the second leg, and the hook portion is hooked on the anti-rotation pin to prevent the fixed member from disengaging from the housing.

[0009] In at least one embodiment, the length of the second leg is greater than the length of the first leg.

[0010] In at least one embodiment, the lead screw is a ball screw.

[0011] In at least one embodiment, the electric shift actuator further includes a shift fork, and the nut wing is engaged with the shift fork to drive the shift fork to move.

[0012] In at least one embodiment, when observing the fixed member along the first direction, the fixed member is wedge-shaped.

[0013] In at least one embodiment, the fixed member is press-fitted into the housing, and the fixed member is made of a plastic material.

[0014] In at least one embodiment, the electric shift actuator further includes a motor and a crown gear. The motor is used to drive the crown gear to rotate, and the screw is fixedly connected to the crown gear.

[0015] According to the present application, a bridge drive system is provided, which includes the electric shift actuator as described above.

[0016] According to the present application, an electric shift actuator and a bridge drive system can be provided, which can prevent the position of the nut on the screw from changing during the transportation of the electric shift actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective schematic view showing the state of a fixed member installed in an electric shift actuator for illustrating an embodiment of the present application.

[0018] Figure 2 is a top schematic view showing the state of a fixed member installed in an electric shift actuator for illustrating an embodiment of the present application.

[0019] Figure 3 is a perspective schematic view of a fixed member according to an embodiment of the present application.

[0020] Figure 4 is a top schematic view of a fixed member according to an embodiment of the present application.

[0021] Figure 5A side view schematic diagram of a fixing member according to an embodiment of the present application.

[0022] Explanation of reference numerals

[0023] 1: Fixing member; 1a: One end; 1b: The other end; 12: First leg; 13: Second leg; 131: Hook portion; 14: Third leg; 15: First groove; 16: Second groove; 10: Housing; 20: Crown gear; 21: Screw; 22: Nut; 22a: Central hole; 220: Nut main body; 221: Nut wing; 30: Anti-rotation pin; X: First direction; Y: Second direction; Z: Third direction. Detailed implementation manners

[0024] Hereinafter, the detailed implementation manners of the present application will be described with reference to the drawings. It should be noted that the following embodiments are only used to illustrate the technical solutions of the present application and do not limit the protection scope of the present application. Changes, modifications, etc. made within the scope of the technical idea of the present application are all within the protection scope of the present application. Moreover, the drawings of the present application are all schematic diagrams, and there may be a situation where the dimensional ratios are inconsistent with the actual dimensional ratios.

[0025] As Figure 1 shown, the direction of installing and disassembling the fixing member 1 is set as the first direction X, the extending direction of the nut wing 221 in the state where the nut 22 of the ball screw is installed in the housing 10 is set as the second direction Y, and the extending direction of the screw 21 of the ball screw is set as the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Among them, the description of each structure is detailed below. In addition, the first direction X, the second direction Y, and the third direction Z are only used to facilitate the description of the technical solutions of the present application and do not limit the specific use orientation of the fixing member of the present application.

[0026] As Figure 1 shown, the electric shift actuator may include a housing 10, a crown gear 20, and a ball screw. The crown gear 20 and the ball screw are received in the housing 10. The ball screw includes a screw 21 and a nut 22.

[0027] As Figure 1 and Figure 2 shown, a spiral groove is provided on the outer surface of the screw 21. In the extending direction of the screw 21, that is, the third direction Z, one end of the screw 21 is fixed to the crown gear 20, and the other end is rotatably supported by the housing 10. Thus, the screw 21 can be driven to rotate by the crown gear 20.

[0028] Here, the electric shift actuator may further include a motor, a motor output shaft, and a pinion gear. The pinion gear, which is the output gear of the motor, meshes with the crown gear 20, so that the crown gear 20 can be driven to rotate by the motor.

[0029] Some examples of the electric shift actuator may include CN217197776U, CN217197777U, CN218536321U, etc., and the entire contents of these patent applications are incorporated herein by reference.

[0030] A nut 22 is sleeved on the screw 21. Specifically, a central hole 22a penetrating the nut 22 is provided at the center of the nut 22, and a helical groove corresponding to the helical groove of the screw 21 is provided on the inner surface of the central hole 22a. By inserting the screw 21 into the central hole 22a of the nut 22, a channel for the balls to roll can be formed by the helical groove of the screw 21 and the helical groove of the nut 22. Here, the rotational motion of the screw 21 is converted into a linear motion of the nut 22 in the third direction Z.

[0031] As Figure 1 shown, the nut 22 includes a nut main body portion 220 and a nut wing portion 221. The nut main body portion 220 is cylindrical. In the third direction Z, the nut wing portion 221 is provided at the end portion on the opposite side of the side where the crown gear 20 of the nut main body portion 220 is located. And, the nut wing portion 221 extends from the outer peripheral surface of the nut main body portion 220 along the second direction Y and is integrally in a plate shape having a certain thickness in the third direction Z. The nut wing portion 221 can be engaged with the shift fork to drive the shift fork to move. In the housing 10, in the second direction Y, an anti-rotation pin 30 is provided on each of the two sides across the screw 21. When the ball screw is received in the housing 10, the nut wing portion 221 straddles below ( Figure 1 above in ), so that the anti-rotation pin 30 can prevent the nut wing portion 221 and the nut main body portion 220 from rotating. Each structure in the electric shift actuator can adopt an appropriate structure known in the art, and more detailed descriptions are omitted here.

[0032] When the electric shift actuator works, the torque is transmitted to the screw 21 via the crown gear 20, and the screw 21 drives the nut 22 to perform a linear motion.

[0033] As Figure 3 shown, in an embodiment of the present application, the fixing member 1 is generally in a substantially letter M shape as a whole. As Figure 4 shown, when observing the fixing member 1 along the first direction X, the fixing member 1 is substantially wedge-shaped and has one end portion 1a that is the narrow end of the wedge and the other end portion 1b that is the wide end of the wedge. The one end portion 1a and the other end portion 1b of the fixing member 1 are opposite to each other in the third direction Z.

[0034] The fixing member 1 includes a bottom portion 11, at least two legs branching and extending from the bottom portion 11 along the first direction X, and a groove portion located between adjacent legs. Specifically, in an embodiment of the present application, asFigure 3 As shown, in the first direction X, the first leg 12, the second leg 13, and the third leg 14 branch out and extend from the bottom 11. A first groove 15 is formed between the first leg 12 and the second leg 13, and a second groove 16 is formed between the second leg 13 and the third leg 14.

[0035] In the first direction X, the length of the second leg 13 is greater than the lengths of the first leg 12 and the third leg 14, and a hook portion 131 is provided at the extended top end of the second leg 13. Thus, it is possible to prevent the first leg 12 and the third leg 14 from interfering with the hook portion 131 hooking on the anti-rotation pin 30 on one side.

[0036] As Figure 3 and Figure 5 shown, the second leg 13 is in the shape of a plate having a certain width in the third direction Z, and the width of the second leg 13 is set as D13. And, in the third direction Z, the second leg 13 has a first side surface 13a on the side of the first groove 15 and another side surface 13b on the side of the second groove 16. In addition, the width of the first groove 15 is set as D15.

[0037] As Figure 1 and Figure 2 shown, during the transportation of the electric shift actuator, the fixing member 1 can be installed in the electric shift actuator along the first direction X, so as to fix the position of the fixing nut 22 on the screw rod 21. When transported to the destination for assembly, the fixing member 1 can be removed from the electric shift actuator along the first direction X.

[0038] Specifically, the first groove 15 of the fixing member 1 is sleeved and fixed on the outer surface of the nut wing portion 221 of the nut 22, one end portion 1a and the other end portion 1b of the fixing member 1 abut against the inner wall of the housing 10, and the hook portion 131 of the second leg 13 hooks on the anti-rotation pin 30 on one side. Among them, the first groove 15 being sleeved on the nut wing portion 221 can adopt either an interference fit or a transition fit. In addition, in the third direction Z, one end portion 1a of the fixing member 1 abuts against the inner wall on the side where the crown gear 20 of the housing 10 is located, and the other end portion 1b abuts against the inner wall on the opposite side of the side where the crown gear 20 of the housing 10 is located.

[0039] Thus, in the extending direction of the screw rod 21 ( Figure 1 illustrated as the third direction Z in the example), it is possible to use the fixing member 1 to prevent the position of the nut 22 on the screw rod 21 from changing. In addition, since the hook portion 131 of the second leg 13 hooks on the anti-rotation pin 30 on one side, it is possible to prevent the fixing member 1 from falling off along the first direction X, ensuring that the position of the nut 22 on the screw rod 21 can be reliably prevented from changing.

[0040] In this application, asFigure 5 As shown in FIG. 1 , the distance between the other side surface 13b of the second leg portion 13 and the center line 15c of the groove width of the first groove portion 15 in the third direction Z can be set as the delivery position DP (Delivery Position). Figure 2 ) is used to design the width D15 of the first groove portion 15, and on this basis, the width D13 of the second leg portion 13 is designed according to the predetermined transport position DP. In addition, the size and shape of the first leg portion 12 and the third leg portion 14 can be designed according to the structure of the inner wall of the housing 10. In addition, the size of the second leg portion 13 in the first direction X and the size of the hook portion 131 can be designed according to the position of the anti-rotation pin 30 in the housing 10.

[0041] In addition, in the present application, by providing the second groove 16, the elasticity of the fixing member 1 can be improved, thereby facilitating the installation and removal of the fixing member 1. Furthermore, by providing the second groove 16, the amount of material used can be reduced, thereby reducing costs.

[0042] In addition, in the present application, the fixing member 1 can be made of plastic material. Thus, the fixing member 1 can be lightweight and low in cost, and can be recycled after the fixing member 1 is disassembled. In addition, the fixing member 1 can also be made of plastic material with glass fiber added, thereby increasing the toughness and strength of the fixing member 1 and extending its service life.

[0043] Here, an electric bridge drive system is also provided, which may include the electric shift actuator disclosed in the present application. It can be understood that the electric shift actuator may also be used in other appropriate scenarios.

[0044] Here, too, the fixing means form a subject of the present application.

[0045] The present application is not limited to the above-described embodiments, and various changes and modifications can be made within the scope of the technical concept of the present application.

[0046] In the above embodiment, the fixing member 1 is generally in the shape of the letter M. However, the fixing member 1 is not limited thereto, and may be in another shape as long as the fixing member 1 can prevent the position of the nut 22 on the screw 21 from changing.

[0047] For example, according to requirements, the hook portion 131 and the third leg portion 14 may not be provided, and in the first direction X, only the first leg portion 12 and the second leg portion 13 branch and extend from the bottom portion 11. That is, the first groove portion 15 between the first leg portion 12 and the second leg portion 13 is sleeved and fixed to the nut wing portion 22, the first leg portion 12 abuts between the inner wall of the housing 10 and the nut wing portion 22, and the second leg portion 13 abuts between the nut wing portion 22 and the inner wall of the housing 10. Thus, the position of the nut 22 on the screw rod 21 can also be fixed.

[0048] The lead screw in the present application may also be an ordinary lead screw without balls.

Claims

1. An electric shift actuator, characterized in that: include: case; A lead screw housed in the housing, comprising a nut and a screw rod; as well as A fixing member, which is detachably mounted on the housing, comprises: a bottom; a first leg and a second leg, which are respectively branched and extended from the bottom along a first direction; and a first groove, which is located between the first leg and the second leg and extends along the first direction. The nut comprises: a nut body; and a nut wing, which extends from the outer peripheral surface of one end of the nut body along the second direction, the nut wing is in the shape of a plate having a thickness in a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the screw extends in the third direction. Both ends of the fixing member in the third direction respectively abut against the inner wall of the housing, and the first groove portion is sleeved and fixed on the outer surface of the nut wing portion, so that the fixing member fixes the position of the nut on the screw rod.

2. The electric shift actuator according to claim 1, characterized in that: The fixing member further has a third leg portion extending from the bottom portion along the first direction, and a second groove portion is provided between the second leg portion and the third leg portion.

3. The electric shift actuator according to claim 1, characterized in that: The electric shift actuator comprises an anti-rotation pin for preventing the nut from rotating. In the first direction, a hook portion is provided at the extended top end of the second leg portion, and the hook portion is hooked on the anti-rotation pin to prevent the fixing member from escaping from the housing.

4. The electric shift actuator according to claim 3, characterized in that: The length of the second leg is greater than the length of the first leg.

5. The electric shift actuator according to claim 1, characterized in that: The lead screw is a ball screw.

6. The electric shift actuator according to claim 1, characterized in that: The electric shift actuator also includes a shift fork, and the nut wing is engaged with the shift fork to drive the shift fork to move.

7. The electric shift actuator according to claim 1, characterized in that: When the fixing member is viewed along the first direction, the fixing member is wedge-shaped.

8. The electric shift actuator according to claim 1, characterized in that: The fixing member is interference-fitted to the housing, and the fixing member is made of a plastic material.

9. The electric shift actuator according to claim 1, characterized in that: The electric shift actuator also includes a motor and a crown gear, wherein the motor is used to drive the crown gear to rotate, and the screw rod is fixedly connected to the crown gear.

10. An electric bridge drive system, characterized in that: The electric shift actuator comprises the electric shift actuator according to any one of claims 1 to 9.

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