Gear shifting executing mechanism, gearbox and automobile electric drive axle

Abstract

The utility model relates to a gear shifting executing mechanism, a gearbox and an automobile electric drive axle. The transmission mechanism comprises a driving motor, a lead screw and a lead screw nut which is in threaded connection with the lead screw; the shifting block is used for being matched with a shifting fork to perform gear shifting action and is connected with the lead screw nut; the locking mechanism comprises a locking wheel installed between the driving end of the driving motor and the lead screw and a movable locking piece located on the side of the locking wheel, and the locking wheel can be driven by the driving motor to drive the lead screw to rotate; and the locking piece can be matched with the locking wheel so as to limit the rotation of the locking wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission systems, in particular to a gear shifting actuator, a gearbox and an automobile electric drive axle. Background Art

[0002] The shift actuator is the main component in the automobile transmission system. Its main purpose is to drive the transmission to change speed and gear according to the instructions issued by the shift controller, so as to realize the normal driving of the car.

[0003] At present, the gear shift actuator mainly drives the shift fork through air pressure, hydraulic pressure, traditional mechanical methods, etc. to achieve the change of gearbox gear.

[0004] However, with the rapid development of new energy vehicles, gearboxes that use pneumatic or hydraulic drive forks require additional pneumatic or hydraulic equipment, resulting in an increase in vehicle costs. In addition, whether it is pneumatic, hydraulic or mechanical drive, there may be a risk of accidental gear shifting, especially under intense driving or special working conditions, which may cause safety hazards. Summary of the invention

[0005] To this end, the utility model provides a shift actuator, a gearbox and an automobile electric drive axle. The shift actuator integrates the shift actuator of the shift fork and is equipped with a locking mechanism. It has the characteristics of high transmission efficiency, simple structure, fast response speed and easy manufacturing. It can effectively lock the working gear to prevent accidental gear shifting, ensuring fast, smooth and accurate gear shifting during vehicle driving.

[0006] In order to solve the above technical problems, the utility model provides a shift actuator, including a housing and:

[0007] A transmission mechanism, comprising a driving motor, a lead screw and a lead screw nut threadedly connected to the lead screw;

[0008] A shift block, used to cooperate with the shift fork to perform a gear shifting action, and connected to the lead screw nut;

[0009] The locking mechanism comprises a locking wheel installed between the driving end of the driving motor and the lead screw and a movable locking member located beside the locking wheel, wherein the locking wheel can be driven by the driving motor to drive the lead screw to rotate;

[0010] Wherein, the locking member can cooperate with the locking wheel to limit the rotation of the locking wheel.

[0011] In one embodiment of the present utility model, the locking wheel includes a wheel body and first locking teeth distributed on the outer peripheral end of the wheel body, and the locking member includes second locking teeth that can mesh with the locking teeth.

[0012] In one embodiment of the utility model, it also includes a seat body, a connecting arm, a telescopic part installed on the seat body, and a locking arm with one end rotatably connected to the telescopic end of the telescopic part. The locking part is configured as the locking arm, and the two ends of the connecting arm are respectively rotatably connected to the seat body and the connecting arm, and the second locking teeth are distributed on the locking arm.

[0013] In one embodiment of the utility model, a connecting sleeve is provided in the middle of the wheel body, the driving end of the driving motor is connected to a transmission block extending into one side of the connecting sleeve and connected to the connecting sleeve, and the lead screw extends into the other side of the connecting sleeve and is connected to the connecting sleeve.

[0014] In one embodiment of the utility model, the housing is provided with a clearance groove for the shift block to extend and move, the connecting sleeve is provided with a bearing installed in the housing, and the lead screw is also provided with an oil seal installed in the housing.

[0015] In one embodiment of the utility model, the shift block includes a load-bearing part, a driving part and a rotating part located therebetween, respectively, the shift block is rotatably connected to the shell through the rotating part, the driving part is connected to the shift fork, and the screw nut can push the load-bearing part so that the shift block rotates relative to the shell through the rotating part.

[0016] In one embodiment of the utility model, the lead screw nut includes a nut body and a push plate disposed on the nut body;

[0017] The rotating part is provided with a pin shaft installed on the housing;

[0018] The load-bearing part includes a seat body, the seat body is provided with a limit support groove suitable for the push plate to extend into, and the seat body can rotate relative to the push plate;

[0019] The driving part comprises an inserting block, and the shift fork is provided with a slot suitable for inserting the inserting block.

[0020] In one implementation of the utility model, a position feedback device is provided at the side end of the shift block, and a chip for detecting the position of the position feedback device is installed on the housing.

[0021] The utility model also provides a gearbox, comprising the gear shifting actuator.

[0022] The utility model also provides an automobile electric drive axle, comprising the gear shifting actuator.

[0023] The above technical solution of the utility model has the following advantages compared with the prior art:

[0024] The utility model discloses a gear shift actuator, a gearbox and an automobile electric drive axle. The gear shift actuator adopts a driving motor, a lead screw and a lead screw nut connected by a thread as a transmission mechanism. The threaded transmission method of the lead screw can effectively convert the rotational motion of the driving motor into linear motion, realize efficient energy transfer, and ensure transmission efficiency. The overall structure is simple, which not only reduces the manufacturing difficulty and cost, but also reduces the failure rate and improves the reliability and stability of the system.

[0025] The utility model provides a locking mechanism to lock the shift fork in a desired position, thereby ensuring that there is no risk of accidental gear disengagement during the gear shifting process and improving the safety of the system.

[0026] The utility model provides a position feedback device on the shift block, and a Hall sensor and a magnet for detecting the position of the position feedback device are installed on the housing. The control system can monitor the position of the shift fork in real time to ensure that it is accurately in place, thereby ensuring the reliability and consistency of the shifting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0028] Figure 1 It is an exploded structural schematic diagram of the shift actuator of the utility model.

[0029] Figure 2 It is a schematic diagram of the overall structure of the shift actuator of the utility model.

[0030] Figure 3 It is a structural schematic diagram of the cooperation between the shifting block and the lead screw nut of the utility model.

[0031] Figure 4 It is a structural schematic diagram of the shifting block of the utility model.

[0032] Figure 5 It is a structural schematic diagram of the locking mechanism of the utility model.

[0033] Figure 6 It is a structural schematic diagram of the locking wheel of the utility model.

[0034] Description of the Figures in the Specification:

[0035] 1. Transmission mechanism; 11. Driving motor; 12. Lead screw; 13. Lead screw nut; 131. Nut body; 132. Push plate; 132a. Wing plate; 14. Bearing; 15. Oil seal; 16. Transmission block;

[0036] 2. shift block; 21. load-bearing part; 22. driving part; 23. rotating part; 24. pin shaft; 25. position-limiting support groove; 26. insert block; 27. seat body; 271. position-limiting block; 272. strip groove; 273. arc surface; 28. position feedback device;

[0037] 3. Locking mechanism; 31. Locking wheel; 311. First locking tooth; 312. Wheel body; 313. Connecting sleeve; 32. Locking member; 321. Second locking tooth; 33. Seat body; 34. Telescopic member; 35. Connecting arm;

[0038] 4. Shell;

[0039] 5. Fork; 51. Slot;

[0040] 6. Chip. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0042] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0043] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0045] Reference Figure 1 , Figure 2As shown, a shift actuator of the utility model includes a housing 4 and:

[0046] The transmission mechanism 1 comprises a driving motor 11, a lead screw 12 and a lead screw nut 13 threadedly connected to the lead screw 12;

[0047] The shift block 2 is used to cooperate with the shift fork 5 to perform a shifting action and is connected to the lead screw nut 13;

[0048] The locking mechanism 3 includes a locking wheel 31 installed between the driving end of the driving motor 11 and the lead screw 12, and a movable locking member 32 located beside the locking wheel 31. The locking wheel 31 can be driven by the driving motor 11 to drive the lead screw 12 to rotate.

[0049] The locking member 32 can cooperate with the locking wheel 31 to limit the rotation of the locking wheel 31 .

[0050] The shift actuator adopts a drive motor 11, a lead screw 12 and a threaded lead screw nut 13 as a transmission mechanism 1. The threaded transmission method of the lead screw 12 can effectively convert the rotational motion of the drive motor 11 into linear motion, realize efficient energy transmission, and ensure transmission efficiency.

[0051] In one embodiment, referring to Figure 6 As shown, the locking wheel 31 includes a wheel body 312 and first locking teeth 311 distributed on the outer peripheral end of the wheel body 312, and the locking member 32 includes second locking teeth 321 that can mesh with the locking teeth.

[0052] In one embodiment, referring to Figure 5 As shown, it also includes a seat body 33, a connecting arm 35, a telescopic member 34 installed on the seat body 33, and a locking arm with one end rotatably connected to the telescopic end of the telescopic member 34, the locking member 32 is configured as the locking arm, and the two ends of the connecting arm 35 are respectively rotatably connected to the seat body 33 and the connecting arm 35, and the second locking teeth 321 are distributed on the locking arm.

[0053] Specifically, the locking arm may be in the shape of a long block and located on the upper side of the radial direction of the locking wheel 31. The telescopic member 34 may be a mechanism such as a cylinder or an electric cylinder.

[0054] It can be understood that by driving the telescopic member 34, the locking arm can be moved toward the locking wheel 31, thereby engaging the first locking tooth 311 and the second locking tooth 321, thereby limiting the rotation of the screw 12, thereby effectively locking the fork 5 in the desired position, and effectively eliminating the risk of the electric drive axle or gearbox being out of gear.

[0055] In one embodiment, referring to Figure 6As shown, a connecting sleeve 313 is provided in the middle of the wheel body 312, the driving end of the driving motor 11 is connected to a transmission block 16 extending into one side of the connecting sleeve 313 and connected to the connecting sleeve 313, and the lead screw 12 extends into the other side of the connecting sleeve 313 and is connected to the connecting sleeve 313.

[0056] The drive motor 11 is connected to the transmission block 16 , and the transmission block 16 cooperates with the locking wheel 31 to drive the screw rod to rotate, thereby driving the gear shifting operation.

[0057] The transmission block 16 and the connecting sleeve 313, and the lead screw 12 and the connecting sleeve 313 can be connected as one by interference fit, key connection or laser welding to ensure synchronous action.

[0058] In one embodiment, the housing 4 is provided with a clearance groove for the shift block 2 to extend and move, the connecting sleeve 313 is sleeved with a bearing 14 installed in the housing 4, and the lead screw 12 is also sleeved with an oil seal 15 installed in the housing 4. A plurality of bearing 14 seats are provided in the housing 4 to support the bearing 14 and the lead screw 12, the connecting sleeve 313 and the bearing 14 are installed by interference fit, and are fixed to the housing 4 by means of the bearing 14 end cover, the housing 4 closing or the housing 4 riveting and locking, so as to control the axial freedom of the lead screw movement.

[0059] In one embodiment, referring to Figure 3 , Figure 4 As shown, the shift block 2 includes a load-bearing part 21, a driving part 22 and a rotating part 23 located therebetween, respectively, at the head and tail parts. The shift block 2 is rotatably connected to the housing 4 via the rotating part, the driving part 22 is connected to the shift fork 5, and the lead screw nut 13 can push the load-bearing part 21, so that the shift block 2 rotates relative to the housing 4 via the rotating part 23.

[0060] Specifically, the lead screw nut 13 includes a nut body 131 and a push plate 132 disposed on the nut body 131;

[0061] The rotating part is provided with a pin shaft 24 mounted on the housing 4;

[0062] The load-bearing portion 21 includes a seat body 33, and the seat body 33 is provided with a limit support groove 25 for the push plate 132 to extend thereinto. The seat body 33 can rotate relative to the push plate 132;

[0063] The driving portion 22 includes an inserting block 26 , and the shift fork 5 is provided with a slot 51 suitable for the inserting block 26 to be inserted into.

[0064] In one embodiment, referring to Figure 3As shown, the push plate 132 includes two wing plates 132a which are arranged at the end of the nut body 131 and are symmetrically arranged along the radial direction of the screw 12. The seat body 33 includes a strip groove 272 extending along the radial direction of the screw 12 and two limit units located on both sides of the radial direction of the screw 12; each limit unit includes two limit blocks 271 located on both sides of the strip groove 272 and arranged opposite to each other, and the two limit blocks 271 in each limit unit have a convex arc surface 273 facing each other, and the arc surface 273 can (rollingly) contact with the end surface of the wing plate 132a, and a support groove for the wing plate 132a to extend into is formed between the corresponding two arc surfaces 273.

[0065] A transition slope is formed between the end surface of the strip groove 272 (along the axial direction of the lead screw 12 ) and the arc surface 273 .

[0066] The bottom end of the wing plate 132a is accommodated in the strip groove 272, and the arc surface 273 protrudes from the end surface of the strip groove 272 (along the axial direction of the screw 12). When the shift block 2 rotates to a predetermined position, the bottom end of the wing plate 132a can abut against the transition slope.

[0067] Through the above arrangement, the stability of the push plate 132 in pushing the shift block 2 can be improved, ensuring that the wing plate 132a can move stably in the limit support groove 25, thereby improving the rotation positioning accuracy of the shift block 2. The design of the arc surface 273 in the limit block 271 helps to make the limit block 271 and the wing plate 132a in rolling contact when the shift block 2 rotates, reducing friction and wear, and extending the service life of the mechanism.

[0068] In one embodiment, referring to Figure 1 As shown, a position feedback device 28 is provided at the side end of the shift block 2 (located just above one end of the through hole on the rotating part 23), and a chip 6 for detecting the position of the position feedback device 28 is installed on the housing 4. Specifically, the chip 6 adopts a Hall sensor, and the position feedback device 28 adopts a magnet. The position detection is performed by combining the Hall sensor and the magnet, and the control system monitors the position of the shift fork 5 in real time through the position feedback device 28 to ensure that it is accurately in place.

[0069] The shift actuator can be applied to a gearbox or an electric drive axle of an automobile, and the shift fork 5 thereof matches with the shift shaft sleeve of the gearbox or the electric drive axle of the automobile.

[0070] Working principle: the control system sends out a shift command, the drive motor 11 receives the signal and starts, the drive motor 11 drives the locking wheel 31 to rotate through its driving end, the locking wheel 31 is connected to the lead screw 12, and then the lead screw 12 starts to rotate;

[0071] As the lead screw 12 rotates, the lead screw nut 13 threadedly connected to the lead screw 12 moves axially along the lead screw 12, and the axial movement of the lead screw nut 13 drives the shift block 2 to rotate relative to the housing 4, thereby driving the shift fork 5 to move;

[0072] When the shift block 2 is located at the specified position, the shift fork 5 engages with the shaft sleeve in the gearbox to complete the gear shifting operation;

[0073] After the control system detects that the shift fork 5 has reached the predetermined position, it sends a locking command to the locking mechanism 3, drives the locking arm through the telescopic member 34, and moves the locking arm toward the locking wheel 31, so that the first locking tooth 311 and the second locking tooth 321 engage, restricting the rotation of the locking wheel 31, thereby effectively locking the shift fork 5 in the desired position through the locking mechanism 3, effectively eliminating the risk of the electric drive axle or the gearbox being out of gear.

[0074] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A gear shift actuator, characterized in that: It comprises a housing (4) and: A transmission mechanism (1) comprising a drive motor (11), a lead screw (12), and a lead screw nut (13) threadedly connected to the lead screw (12); A shift block (2), used for cooperating with the shift fork (5) to perform a gear shifting action, and connected to the lead screw nut (13); A locking mechanism (3) comprising a locking wheel (31) mounted between a driving end of the driving motor (11) and the lead screw (12), and a movable locking member (32) located beside the locking wheel (31), wherein the locking wheel (31) can be driven by the driving motor (11) to drive the lead screw (12) to rotate; The locking member (32) can cooperate with the locking wheel (31) to limit the rotation of the locking wheel (31).

2. A gear shift actuator according to claim 1, characterized in that: The locking wheel (31) comprises a wheel body (312) and first locking teeth (311) distributed on the outer peripheral end of the wheel body (312), and the locking member (32) comprises second locking teeth (321) capable of meshing with the locking teeth.

3. A gear shift actuator according to claim 2, characterized in that: It also comprises a seat body (33), a connecting arm (35), a telescopic member (34) mounted on the seat body (33), and a locking arm having one end rotatably connected to the telescopic end of the telescopic member (34), the locking member (32) being configured as the locking arm, the connecting arm (35) having two ends rotatably connected to the seat body (33) and the connecting arm (35), respectively, and the second locking teeth (321) being distributed on the locking arm.

4. A gear shift actuator according to claim 2, characterized in that: A connecting sleeve (313) is provided in the middle of the wheel body (312); a driving end of the driving motor (11) is connected to a transmission block (16) extending into one side of the connecting sleeve (313) and connected to the connecting sleeve (313); and the lead screw (12) extends into the other side of the connecting sleeve (313) and is connected to the connecting sleeve (313).

5. A gear shift actuator according to claim 4, characterized in that: The housing (4) is provided with a clearance groove for the shifting block (2) to extend and move, the connecting sleeve (313) is sleeved with a bearing (14) installed in the housing (4), and the lead screw (12) is also sleeved with an oil seal (15) installed in the housing (4).

6. The gear shift actuator according to claim 1, characterized in that: The shift block (2) comprises a load-bearing portion (21) and a driving portion (22) respectively located at the head and tail, and a rotating portion (23) located therebetween; the shift block (2) is rotatably connected to the housing (4) via the rotating portion (23); the driving portion (22) is connected to the shift fork (5); and the lead screw nut (13) is capable of pushing the load-bearing portion (21) so that the shift block (2) is rotated relative to the housing (4) via the rotating portion (23).

7. A gear shift actuator according to claim 6, characterized in that: The lead screw nut (13) comprises a nut body (131) and a push plate (132) arranged on the nut body (131); The rotating part (23) is provided with a pin shaft (24) mounted on the housing (4); The load-bearing portion (21) comprises a seat body (33), the seat body (33) is provided with a limit support groove (25) suitable for the push plate (132) to extend therein, and the seat body (33) is capable of rotating relative to the push plate (132); The driving portion (22) comprises an insert block (26), and the shift fork (5) is provided with a slot (51) suitable for inserting the insert block (26).

8. The gear shift actuator according to claim 1, characterized in that: A position feedback device (28) is provided at the side end of the shift block (2), and a chip (6) for detecting the position of the position feedback device (28) is mounted on the housing (4).

9. A gearbox, characterized in that: It comprises the shift actuator as described in any one of claims 1 to 8.

10. An automotive electric drive axle, characterized in that: It comprises the shift actuator as described in any one of claims 1 to 8.

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