Wheel-side steering gear and locking device

Abstract

The utility model discloses a wheel rim steering gear and locking device, including first motor, driving gear, driven gear, screw, hold-down subassembly and locking shell, the output end of first motor is coaxially connected with driving gear, driving gear is engaged with driven gear, one end of screw is rotatingly connected with locking shell, the other end of screw is rotatingly connected with locking shell. The other end of the screw penetrates through the driven gear to be connected with the threads, the screw is coaxially and fixedly connected with the driven gear, and a groove used for movably abutting against the worm is formed in the other end of the pressing assembly. When an independent wheel of a vehicle needs to be locked at any position, the first motor drives the pressing assembly to move in the axial direction of the screw rod through the driving gear and the driven gear till the pressing assembly presses the worm, the worm and the worm wheel are tightly abutted against each other, a meshing gap between the worm wheel and the worm is eliminated, and the independent wheel has the capability of being locked at any position.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steering gear, concretely relates to wheel edge steering gear and locking device. BACKGROUND

[0002] In recent years, with the rapid development of intelligent driving technology and new energy vehicles, the dynamic locking performance of vehicle transmission system is facing higher requirements. Especially in the field of electric vehicles, the rear wheel active steering technology is gradually popularized, but when driving at high speed or in the event of a sudden failure, if the steering mechanism cannot be locked in time, it may lead to over-steering risk, endangering the safety of driving. At present, the wheel edge steering electric steering gear generally uses a worm and gear transmission pair as the core transmission mechanism, although the worm and gear transmission pair has certain self-locking characteristics, but its locking mechanism still has significant defects: due to the periodic non-contact idle period of the worm and gear in the meshing process, when the worm stops rotating, the worm may be in the idle state of disengaging meshing, resulting in the worm unable to achieve instant locking at any angle position. This intermittent meshing characteristic limits the locking position of the wheel to the fixed phase of the worm gear tooth groove, and cannot be adaptively adjusted according to the actual working condition requirements, ultimately leading to the difficulty of the independent wheel to be quickly locked at the target angle in an emergency, seriously affecting the dynamic stability and active safety control ability of the vehicle. SUMMARY

[0003] In view of the above technical problems, the utility model provides a wheel edge steering gear and locking device, which converts rotary motion into linear motion through a first motor drive gear set and a screw rod transmission structure, and realizes accurate locking control of the worm by the compression assembly.

[0004] The technical scheme adopted by the utility model is as follows: a locking device, comprising a first motor, a driving gear, a driven gear, a screw rod, a compression assembly, and a locking housing, the output end of the first motor is coaxially connected with the driving gear, the driving gear is engaged with the driven gear, one end of the screw rod is rotatably connected with the locking housing, the other end of the screw rod is threadedly connected with the compression assembly through the driven gear, the screw rod is fixedly connected with the driven gear in the same axis, and the other end of the compression assembly is provided with a groove for active abutment with the worm.

[0005] Optionally, the locking housing is provided with a first container groove, the driving gear and the driven gear are rotatably installed inside the first container groove, the locking housing is provided with an annular hole provided with a bearing, and the screw rod is abutted against the inner ring of the bearing.

[0006] Optionally, the groove is an arc-shaped groove, and the side of the arc-shaped groove facing the worm is provided with a flexible pad.

[0007] Optionally, the end of the screw rod close to the driven gear is fixedly connected with a limiting block, the compression assembly is in active abutment with the limiting block, and the top surface of the limiting block is higher than the groove opening of the first container groove.

[0008] Optionally, the pressing assembly comprises a transmission plate and a pressing block, the transmission plate comprises an extension part and an extension plate integrally connected with the extension part, an inner thread connected with a screw rod is arranged on an inner circumferential wall of the extension part, and one end of the pressing block is fixedly connected with the extension plate and the other end of the pressing block is provided with the groove.

[0009] Optionally, the locking shell is provided with a second accommodating groove, the pressing block is fixedly connected with the transmission plate through a screw, the screw comprises a screw cap and a nail part integrally connected with the screw cap, the screw cap is in sliding fit with the second accommodating groove, and the nail part is fixedly connected with the pressing block through the transmission plate.

[0010] Optionally, the groove depth of the second accommodating groove is greater than the movement stroke of the screw cap, and the screw cap is in clearance fit with the second accommodating groove.

[0011] Optionally, the pressing assembly comprises a top block, an inner thread rotatably connected with a screw rod is arranged in the top block, and a plane for sliding fit with the transmission shell is arranged on an outer circumferential wall of the top block.

[0012] The utility model discloses still disclose a kind of wheel edge steering gear, including second motor, worm, transmission assembly, transmission shell and the locking device described above, the second motor output end is fixedly connected with worm, and the worm is engaged with transmission assembly, and the worm, transmission assembly, first motor are respectively arranged in transmission shell interior, and the locking shell is connected with transmission shell.

[0013] Optionally, the transmission assembly comprises a first worm gear, a first transmission shaft, a transmission wheel, a second transmission shaft and a second worm gear, the first worm gear and the transmission wheel are coaxially arranged on the outer circumferential wall of the first transmission shaft, the worm is engaged with the first worm gear, and the second worm gear is coaxially arranged on the outer circumferential wall of the second transmission shaft, and the second worm gear is engaged with the transmission wheel.

[0014] The utility model discloses still disclose a kind of wheel edge steering gear, including second motor, worm, transmission assembly, transmission shell and the locking device described above, the second motor output end is fixedly connected with worm, and the worm is engaged with transmission assembly, and the worm, transmission assembly, first motor are respectively arranged in transmission shell interior, and the locking shell is connected with transmission shell. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure schematic view of locking device for the utility model embodiment 1;

[0016] Figure 2This is a schematic diagram of the locking device proposed in Embodiment 2 of this utility model;

[0017] Figure 3 This is an exploded view of the locking device proposed in Embodiment 2 of this utility model;

[0018] Figure 4 This is a schematic diagram of the wheel-side steering device proposed in this utility model.

[0019] The labels in the attached figures are as follows: 1. First motor; 2. Drive gear; 3. Driven gear; 4. Screw; 5. Pressure block; 6. Extension; 7. Extension plate; 8. Locking housing; 9. First receiving groove; 10. Second receiving groove; 11. Top block; 12. Plane; 13. Bearing; 14. End cover; 15. Worm gear; 16. Nut; 17. Limiting block; 18. Second motor; 19. Transmission housing; 20. Annular hole; 21. First worm gear; 22. First transmission shaft; 23. Transmission wheel; 24. Second transmission shaft; 25. Second worm gear; 26. Groove; 27. Flexible pad. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] like Figures 1 to 3 As shown, this embodiment discloses a locking device, including a first motor 1, a driving gear 2, a driven gear 3, a screw 4, a clamping assembly, and a locking housing. The output end of the first motor 1 is coaxially connected to the driving gear 2. The driving gear 2 meshes with the driven gear 3. One end of the screw 4 is rotatably connected to the locking housing, and the other end of the screw 4 passes through the driven gear 3 and is threadedly connected to the clamping assembly. The screw 4 and the driven gear 3 are coaxially fixedly connected. The other end of the clamping assembly is provided with a groove 26 for moving and abutting against the worm gear. The first motor 1 drives the driving gear 2 to rotate, which in turn drives the driven gear 3 to rotate. The driven gear 3 then drives the screw 4 to rotate synchronously. Since the screw 4 is connected to the clamping assembly via a thread, the screw 4 only rotates, while the clamping assembly moves axially along the screw 4. When an independent wheel needs to be locked at any position, the first motor 1, through the driving gear 2 and driven gear 3, drives the clamping assembly to move axially along the screw 4 until the clamping assembly clamps the worm, making the worm and worm wheel tightly abut against each other, eliminating the meshing gap between the worm wheel and worm, and enabling the independent wheel to be locked at any position. Applying locking force directly in the worm gear transmission path ensures that the output shaft is immediately fixed in the event of a power outage or malfunction in the steering system, preventing unexpected steering.

[0023] like Figure 1As shown, the locking housing is provided with a first container groove 9, the driving gear 2 and the driven gear 3 are rotatably installed inside the first container groove 9, the locking housing is provided with an annular hole with a bearing installed, and the screw rod 4 abuts against the inner ring of the bearing. The screw rod 4 is rotatably connected with the locking housing through the bearing, the hole wall of the annular hole of the locking housing protrudes from the locking housing, and the outer peripheral wall of the hole wall is connected with an end cover through threads. Such design facilitates the installation of the bearing and the screw rod 4.

[0024] As shown in the figure, Figure 1 As shown, the groove 26 is an arc-shaped groove, and the arc-shaped groove is provided with a flexible pad 27 on the side facing the worm. The arc-shaped groove and the outer cylindrical surface of the worm are self-adaptively attached, the contact area is increased, the locking force is dispersed, and stress concentration is avoided. The flexible pad 27 (such as rubber or polyurethane) provides a shock absorption function, reduces the locking noise, and protects the surface plating of the worm from being scratched.

[0025] As shown in the figure, Figure 1 As shown, the screw rod 4 is fixedly connected with a limiting block 17 at one end close to the driven gear 3, the pressing assembly is movably abutted against the limiting block 17, and the top surface of the limiting block 17 is higher than the groove opening of the first container groove 9, that is, the limiting block 17 is located outside the first container groove, and the limiting block is abutted against the pressing assembly to form a mechanical hard limit, preventing the screw rod 4 from excessively retreating to cause the gears to disengage.

[0026] As shown in the figure, Figure 1 As shown, the pressing assembly includes a transmission plate and a pressing block 5, the transmission plate includes an extension part 6 and an extension plate 7 integrally connected with the extension part, the extension part 6 is a cylindrical structure, the inner peripheral wall of the extension part 6 is provided with an internal thread connected with the screw rod 4, one end of the pressing block 5 is fixedly connected with the extension plate 7, and the other end of the pressing block 5 is provided with the groove 26. The screw rod 4 is connected with the transmission plate through threads, the transmission plate moves along the axial direction of the screw rod 4, the transmission plate drives the pressing block 5 to move along the axial direction of the screw rod 4, and the pressing block 5 approaches or moves away from the worm.

[0027] As shown in the figure, Figure 1 As shown, the locking housing 8 is provided with a second container groove 10, the pressing block 5 is fixedly connected with the transmission plate through a screw, the screw includes a nut 16 and a pin part integrally connected with the nut 16, the nut 16 is slidably matched with the second container groove 10, and the pin part is fixedly connected with the pressing block 5 through the transmission plate. The pressing block 5 has a screw hole matched with the screw, and the transmission plate can also be provided with the screw hole.

[0028] As shown in the figure, Figure 1As shown, the second container groove has a groove depth greater than the movement stroke of the nut, the nut 16 is in clearance fit with the second container groove 10. Since the screw rod 4 rotates, the transmission plate has a tendency to rotate with the screw rod 4, the nut 16 is in clearance fit with the second container groove 10, the nut of the screw is in sliding fit with the second container groove, forming a guide structure, ensuring the stable linear motion trajectory of the compression assembly, preventing skewing and jamming, and the shape of the outer peripheral wall of the compression block 5 is not required.

[0029] Embodiment 2

[0030] As shown in Figure 2 and 3 , the compression assembly includes a top block 11, the inside of the top block 11 is provided with an internal thread connected with the rotation of the screw rod 4, and the outer peripheral wall of the top block 11 is provided with a flat surface 12 for sliding fit with the transmission housing. Since the screw rod 4 rotates, the top block has a tendency to rotate with the screw rod 4, the transmission housing 19 is provided with a through hole matched with the shape of the top block 11, the top block can be an arc + flat surface structure, two arc surfaces are correspondingly arranged, two flat surfaces are correspondingly arranged, or the cross section of the top block can be quadrilateral or triangular, the flat surface avoids the circumferential rotation of the top block in the transmission housing, the flat surface and the transmission housing are in sliding fit along the axial direction, forming a guide structure, ensuring the stable linear motion trajectory of the top block, and preventing skewing and jamming.

[0031] The utility model discloses still disclose a wheel edge steering gear, as shown in Figure 4 , including second motor 18, worm 15, transmission assembly, transmission housing 19 and the locking device described above, second motor 18 output and worm 15 fixed connection, worm 15 and transmission assembly are engaged, worm 15, transmission assembly are arranged in transmission housing interior respectively, locking housing 8 and transmission housing 19 are connected. Locking housing 8 and transmission housing 19 are connected through bolt, and the transmission housing and the locking housing protect the screw rod 4, the first motor 1 and the compression assembly. When the compression assembly is the top block 11, the transmission housing is provided with a through hole in sliding fit with the top block along the axial direction of the screw rod 4.

[0032] As shown in Figure 4As shown, the transmission assembly includes a first worm wheel 21, a first transmission shaft 22, a transmission wheel 23, a second transmission shaft 24 and a second worm wheel 25, the first worm wheel 21 and the transmission wheel 23 are coaxially arranged on the outer wall of the first transmission shaft 22, the worm 15 is engaged with the first worm wheel 21, the second worm wheel 25 is coaxially arranged on the outer wall of the second transmission shaft 24, and the second worm wheel 25 is engaged with the transmission wheel 23. The second transmission shaft 24 can be connected with the wheel connecting shaft, and the two-stage worm gear transmission design (first worm wheel 21→transmission wheel 23→second worm wheel 25) realizes large speed reduction ratio, amplifies the output torque of the second motor 18, and is suitable for the steering requirements of heavy vehicles. The first worm wheel 21, the transmission wheel 23 and the second worm wheel 25 are respectively helical gears, and the tooth surface contact lines of the helical gears are progressive when the helical gears are engaged, which significantly reduces impact and noise compared with straight gears.

[0033] It can be understood that the specific embodiments described above are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for convenience of description. Multiple technical solutions in the same embodiment and multiple technical solutions of different embodiments can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation, direct or indirect application in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A locking device, characterized in that, It includes a first motor, a driving gear, a driven gear, a screw, a clamping assembly, and a locking housing. The output end of the first motor is coaxially connected to the driving gear, and the driving gear meshes with the driven gear. One end of the screw is rotatably connected to the locking housing, and the other end of the screw passes through the driven gear and is threadedly connected to the clamping assembly. The screw and the driven gear are coaxially fixedly connected. The other end of the clamping assembly is provided with a groove for moving and abutting against the worm gear.

2. The locking device according to claim 1, characterized in that, The locking housing is provided with a first receiving groove, and the driving gear and the driven gear are rotatably installed inside the first receiving groove. The locking housing is provided with an annular hole for installing a bearing, and the screw abuts against the inner ring of the bearing.

3. The locking device according to claim 1, characterized in that, The groove is an arc-shaped groove, and a flexible pad is provided on the side of the arc-shaped groove facing the worm gear.

4. The locking device according to claim 1, characterized in that, The end of the screw near the driven gear is fixedly connected to a limiting block, the clamping assembly moves against the limiting block, and the top surface of the limiting block is higher than the opening of the first receiving groove.

5. The locking device according to claim 2, characterized in that, The clamping assembly includes a transmission plate and a pressure block. The transmission plate includes an extension and an extension plate integrally connected to the extension. The inner peripheral wall of the extension is provided with an internal thread that connects to a screw. One end of the pressure block is fixedly connected to the extension plate, and the other end of the pressure block is provided with the groove.

6. The locking device according to claim 5, characterized in that, The locking housing is provided with a second receiving groove. The pressure block is fixedly connected to the transmission plate by screws. The screw includes a nut and a nail portion integrally connected to the nut. The nut is slidably engaged with the second receiving groove. The nail portion passes through the transmission plate and is fixedly connected to the pressure block.

7. The locking device according to claim 6, characterized in that, The depth of the second groove is greater than the travel of the nut, and the nut is in clearance fit with the second groove.

8. The locking device according to claim 1, characterized in that, The clamping assembly includes a top block, the top block having an internal thread that is rotatably connected to the screw, and the outer peripheral wall of the top block having a plane for sliding engagement with the transmission housing.

9. A wheel-side steering system, characterized in that, The device includes a second motor, a worm gear, a transmission assembly, a transmission housing, and a locking device as described in any one of claims 2 to 8. The output end of the second motor is fixedly connected to the worm gear, the worm gear meshes with the transmission assembly, the worm gear, the transmission assembly, and the first motor are respectively disposed inside the transmission housing, and the locking housing is connected to the transmission housing.

10. The wheel-side steering system according to claim 9, characterized in that, The transmission assembly includes a first worm gear, a first transmission shaft, a transmission wheel, a second transmission shaft, and a second worm gear. The first worm gear and the transmission wheel are coaxially disposed on the outer peripheral wall of the first transmission shaft. The worm meshes with the first worm gear. The second worm gear is coaxially disposed on the outer peripheral wall of the second transmission shaft and meshes with the transmission wheel.

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