Automobile rear wheel steering gear with stage locking mechanism

Abstract

The invention relates to an automobile rear wheel steering gear with a stage locking mechanism, which is an executing mechanism for rear wheel steering, and belongs to the technical field of vehicle steering. The rear wheel steering gear with the step locking mechanism is compact in structure and ingenious in design, the transmission mechanism of the rear wheel steering gear adopts a high-efficiency ball nut assembly transmission scheme, the problems that an existing conventional rear wheel steering gear is low in transmission efficiency, prone to abrasion and heating and the like are solved, meanwhile, in order to make up the characteristic that the rear wheel steering gear cannot be mechanically self-locked, the step locking mechanism is additionally arranged, and the transmission efficiency is improved. After the steering gear is powered off, the shaft core of the electromagnet extends out to prevent the large belt wheel from rotating, so that the axial movement of the ball screw is inhibited, the rear wheels are in a locked state in the straight driving process of the vehicle, and the axial movement of the steering gear, deflection of the vehicle body and influence on driving safety caused by road impact are avoided. The transmission efficiency is improved, the driving safety is ensured, and the automobile rear wheel steering gear is a novel automobile rear wheel steering gear scheme with a stage locking mechanism.

Description

Technical Field

[0001] The invention relates to an automobile rear wheel steering device with a step locking mechanism, which is an executive mechanism for rear wheel steering and belongs to the technical field of vehicle steering. Background Art

[0002] A rear-wheel steering gear is a device used to control the steering direction of a vehicle's rear wheels. In traditional vehicle design, front-wheel steering is the primary steering method, while rear-wheel steering is typically used to enhance the vehicle's handling and improve its maneuverability in confined spaces. This is a type of steer-by-wire system. With technological advancements, rear-wheel steering systems have gradually developed into an important auxiliary steering technology. Due to the working characteristics of the rear-wheel steering gear, to ensure vehicle stability when the vehicle is traveling in a straight line, the rear-wheel steering gear typically has a reverse self-locking feature. This means that the impact and feedback of the road on the rear wheels prevent the rear-wheel steering gear drive shaft from moving, thus ensuring vehicle stability. In addition to the electrical system's locking control strategy, a mechanical locking mechanism is usually required to reduce electrical control pressure.

[0003] Conventional transmission devices currently on the market use structures such as trapezoidal nuts, trapezoidal screws, and roller screws. These are widely used in rear-wheel steering due to their reverse self-locking mechanical properties. However, these devices suffer from low transmission efficiency, high wear and heat generation, and a short lifespan. Therefore, it is necessary to develop a new rear-wheel steering gear that improves transmission efficiency and lifespan while also taking into account the reverse mechanical locking properties of the rear-wheel steering gear to ensure driving safety. Summary of the Invention

[0004] The purpose of the present invention is to provide a rear-wheel steering gear for automobiles with a step-locking mechanism, which, in conjunction with a ball screw transmission mechanism, not only ensures forward transmission efficiency but also takes into account the reverse mechanical locking characteristics required of the rear-wheel steering gear, thereby solving the problems of low transmission efficiency, easy wear and heat generation, and short service life of existing rear-wheel steering gears.

[0005] The technical solution of the present invention is: A rear wheel steering gear for an automobile with a step-locking mechanism: it includes a main housing, a reduction housing, a motor controller assembly and a ball screw; it is characterized in that: a reduction housing is installed at one end of the main housing; a sliding shaft is movably installed in the reduction housing through a bushing; one end of the sliding shaft is threadedly connected to a ball screw; the ball screw, ball nut and reverser constitute a ball screw assembly; the ball screw assembly is connected to the main housing through a four-point contact ball bearing, and is fixed to the main housing through a locking screw plug; one end of the ball nut is sequentially installed with a large synchronous pulley and a locking plate through a hexagonal cylindrical head screw; a push-pull electromagnet is installed on the reduction housing on one side of the locking plate; the push-pull electromagnet is equipped with an electromagnet shaft core; a small synchronous pulley is installed on the main housing above the large synchronous pulley through the motor controller assembly; the small synchronous pulley is connected to the large synchronous pulley through a helical synchronous belt.

[0006] The end surface of the locking disk is divergently provided with a circle of locking members; the locking members are groove-shaped structures; the cross-sectional shapes of the locking members include but are not limited to: triangular structure, trapezoidal structure, rectangular structure and convex structure.

[0007] The locking disc shown is provided with a circle of locking members in a divergent shape; the locking members are tooth-shaped structures; the end of the electromagnet shaft core is provided with locking teeth; the electromagnet shaft core and the locking members are intermittently clamped and connected.

[0008] The tooth-shaped structure of the locking member includes, but is not limited to, a trapezoid, a triangle, a rectangle, and an involute.

[0009] One end of the electromagnet shaft core of the push-pull electromagnet is fixedly installed with an assembly frame; the assembly frame is slidably equipped with an upper locking shaft and a lower locking shaft; one end of the upper locking shaft and one end of the lower locking shaft are both equipped with welded limit blocks; the upper locking shaft and the lower locking shaft are provided with limit bosses; a spring is installed between the limit boss and the assembly frame; one end of the upper locking shaft is provided with an upper locking tooth; one end of the lower locking shaft is provided with a lower locking tooth; the locking plate is provided with an outer locking gear ring and an inner locking gear ring.

[0010] One end of the sliding shaft is provided with an external thread; one end of the ball screw is provided with an internal thread; the sliding shaft and the ball screw are connected to each other in cooperation with the external thread and the internal thread.

[0011] A reverser is installed between the two ends of the ball nut and the ball screw to form a ball screw assembly; the ball screw assembly is fixed in the main housing by a locking screw plug through a four-point contact ball bearing, and the inner ring of the four-point bearing is fixed to the ball nut through a hexagonal nut.

[0012] The locking plate is evenly provided with a plurality of locking plate through holes; the large synchronous pulley is evenly provided with a plurality of threaded holes; the hexagonal cylindrical head screw passes through the locking plate through hole, and the surface of the screw is provided with an external thread that is connected to the threaded hole of the large synchronous pulley, and the locking plate and the large synchronous pulley are installed on one end of the ball nut.

[0013] An electromagnet housing is provided on the outside of the push-pull electromagnet; the electromagnet housing is installed on the main housing through the electromagnet mounting hole; the push-pull electromagnet is connected to the motor controller assembly through the electromagnet wiring harness, and the electromagnet wiring harness is fixed to the reduction housing through the wiring harness connector and the hexagon socket cylindrical head screw.

[0014] A displacement sensor is installed on the outer side of the main housing through a hexagonal cylindrical head screw; the displacement sensor is connected to the motor controller assembly through a displacement sensor wiring harness.

[0015] One end of the ball screw and one end of the sliding shaft are extended to the outside and are equipped with a yoke through a hexagonal flange bolt; the yoke at one end of the sliding shaft is connected to the reduction housing through a stepless clamp and a shield; the yoke at one end of the ball screw is connected to the main housing through a stepless clamp and a shield.

[0016] The advantages of the present invention are: The rear wheel steering gear with a step-locking mechanism has a compact structure and ingenious design. Its transmission mechanism adopts a high-efficiency ball nut assembly transmission solution, which solves the problems of low transmission efficiency, easy wear and heat generation of current conventional rear wheel steering gears. At the same time, in order to compensate for its inability to mechanically self-lock, a step-locking mechanism is added, which not only improves transmission efficiency but also ensures driving safety. It is a new type of automobile rear wheel steering gear solution with a step-locking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the axonometric structure of the present invention; Figure 3 It is a structural schematic diagram of the ball nut assembly and the stepped locking plate of the present invention; Figure 4 This is a schematic diagram illustrating the working principle of the reduction housing and the stepped locking mechanism of the present invention; Figure 5 for Figure 4 A schematic diagram of the working principle of the stepped locking mechanism at A in the middle partial view is in the locked state, i.e. the push-pull electromagnet is in the de-energized state; Figure 6 for Figure 4 A schematic diagram of the working principle of the stepped locking mechanism at the partial view A in the middle is in the unlocked state, i.e. the push-pull electromagnet is energized; Figure 7 for Figure 4 A schematic diagram of the deformation structure of the locking member on the locking plate at the partial view A in the middle; Figure 8 for Figure 4 The partial view A in the middle shows the stepped locking mechanism, the deformation structure of the locking member on the locking plate, and the schematic diagram of the working principle of the locking mechanism in the unlocked state, i.e., the push-pull electromagnet is energized; Figure 9 for Figure 4 A schematic diagram of the working principle of the stepped locking mechanism at the partial view A in the middle, showing the deformation structure of the locking member on the locking plate, and the locking mechanism in the locked state, i.e., the push-pull electromagnet is in the de-energized state; Figure 10 Schematic diagram of other forms of deformation structures of the locking member on the locking plate of the present invention; Figure 11Schematic diagram of other forms of deformation structures of the locking member on the locking plate of the present invention; Figure 12 Schematic diagram of other forms of deformation structures of the locking member on the locking plate of the present invention; Figure 13 Schematic diagram of other forms of deformation structures of the locking member on the locking plate of the present invention; Figure 14 Schematic diagram of the deformation structure of the step-by-step locking mechanism of the present invention; Figure 15 for Figure 14 A schematic diagram of the working principle in which the step-locking mechanism is in a locked state, i.e. the push-pull electromagnet is in a power-off state; Figure 16 for Figure 14 A schematic diagram of the working principle in which the step-locking mechanism is in the unlocked state, i.e. the push-pull electromagnet is energized; Figure 17 Schematic diagram of the deformation structure of the locking member on the locking plate of the present invention; Figure 18 Schematic diagram of the deformation structure of the locking member on the locking plate of the present invention; Figure 19 Schematic diagram of the deformation structure of the locking member on the locking plate of the present invention; Figure 20 Schematic diagram of the deformation structure of the locking member on the locking plate of the present invention; Figure 21 Schematic diagram of another modified structure of the locking mechanism of the present invention; Figure 22 for Figure 21 A schematic diagram of the working principle in which the step-locking mechanism is in the unlocked state, i.e. the push-pull electromagnet is energized; Figure 23 for Figure 21 A schematic diagram of the working principle in which the step-locking mechanism is in a locked state, i.e. the push-pull electromagnet is in a power-off state; Figure 24 for Figure 21 Schematic diagram of the locking state when the middle locking plate rotates counterclockwise; Figure 25 for Figure 21 Schematic diagram of the locked state when the middle locking plate rotates clockwise; Figure 26 for Figure 21 Schematic diagram of the locked state of the outer locking member ring gear when the middle locking plate rotates counterclockwise; Figure 27 for Figure 21 Schematic diagram of the locked state of the inner locking member ring gear when the middle locking plate rotates clockwise.

[0018] In the figure: 1. yoke; 2. guard; 3. hexagonal flange bolt; 4. sliding shaft; 5. stepless clamp; 6. bushing; 7. reduction housing; 8. electromagnet wiring harness; 9. hexagon socket head screw; 10. wiring harness connector; 11. push-pull electromagnet; 12. electromagnet shaft core; 13. helical tooth timing belt; 14. small timing pulley; 15. main housing; 16. motor controller assembly; 17. displacement sensor wiring harness; 18. locking plate; 19. large timing pulley; 20. ball nut; 21. locking screw plug; 22. four-point contact ball bearing; 23. Hexagonal nut; 24. Reverser; 25. Limit boss; 26. Ball screw; 27. Electromagnet mounting hole; 28. Electromagnet housing; 29. ​​External thread; 30. Internal thread; 31. Displacement sensor; 32. Hexagon socket head screw; 33. Hexagon socket head screw; 34. External screw thread; 35. Locking plate through hole; 36. Threaded hole; 37. Locking member; 37-1. External locking gear ring; 37-2. Internal locking gear ring; 38. Locking fault tolerance groove; 39. Locking tooth; 39-1. Upper locking tooth; 39-2. Lower locking tooth; 40-1. Upper locking shaft; 40-2. Lower locking shaft; 41. Assembly bracket; 42. Spring; 43. Welding limit block. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings: Figure 1 、 2 The present invention is a rear-wheel steering gear for an automobile with a step-locking mechanism, comprising a main housing 15, a reduction housing 7, a motor controller assembly 16, and a ball screw 26. The reduction housing 7 is mounted on one end of the main housing 15. A sliding shaft 4 is movably mounted in the reduction housing 7 via a bushing 6. A ball screw 26 is threadedly connected to one end of the sliding shaft 4. The ball screw 26, a ball nut 20, and a reverser 24 form a ball screw assembly.

[0020] The ball screw assembly is connected to the main housing 15 through a four-point contact ball bearing 22 and is fixed to the main housing 15 through a locking screw plug 21, so that the ball nut 20 can rotate and drive the ball screw 26 to move axially; one end of the ball nut 20 is sequentially mounted with a large synchronous pulley 19 and a locking plate 18 through a hexagonal cylindrical head screw 33; a push-pull electromagnet 11 is mounted on the reduction housing 7 on one side of the locking plate 18; the push-pull electromagnet 11 is equipped with an electromagnet shaft core 12; the electromagnet shaft core 12 is intermittently locked and connected to the locking plate 18; a small synchronous pulley 14 is mounted on the main housing 15 above the large synchronous pulley 19 through the motor controller assembly 16; the small synchronous pulley 14 is connected to the large synchronous pulley 19 through a helical toothed synchronous belt 13 to provide steering assistance for the steering gear.

[0021] A plurality of locking members 37 are evenly arranged on the circumferential surface of the locking disk 18; the electromagnet shaft core 12 is intermittently connected to the locking member 37 by a clamping connection; when the push-pull electromagnet 11 is powered off, the electromagnet shaft core 12 is connected to the locking member 37 by a clamping connection; when the push-pull electromagnet 11 is powered on, the electromagnet shaft core 12 is separated from the locking member 37; a locking fault-tolerant groove 38 is provided at one end of the locking member 37 to facilitate the electromagnet shaft core 12 to fall into the locking member 37 when the power is off.

[0022] Figure 7 、 8 The locking member 37 on the locking plate 18 shown in FIG. 9 is a groove-shaped structure, and its cross-sectional shape includes but is not limited to: a triangular structure, a trapezoidal structure, a rectangular structure and a convex structure.

[0023] The end surface of the locking plate 18 is provided with a circle of locking members 37 in a divergent shape; Figure 14 The end of the electromagnet shaft core 12 in the modified structural form is provided with a locking tooth 39; the locking tooth 39 is intermittently engaged with the locking member 37 on the locking disk 18 in the modified form; the working principle is consistent with the above-mentioned locking structure.

[0024] Figure 14 、 15 16 , a circle of locking members 37 are provided on the locking plate 18 in a divergent shape; the locking members 37 are tooth-shaped structures; the electromagnet shaft core 12 is intermittently engaged with the locking members 37 .

[0025] The shape of the locking member 37 includes, but is not limited to, a trapezoid, a triangle, a rectangle, and an involute; Figure 21 、 22 , 23, 24, 25 described another deformation structure form, the push-pull electromagnet 11 of the electromagnet shaft core 12 one end of the assembly bracket 41 is fixed; the assembly bracket 41 is slidably equipped with an upper locking shaft 40-1 and a lower locking shaft 40-2; one end of the upper locking shaft 40-1 and one end of the lower locking shaft 40-2 are both equipped with a welding limit block 43 to prevent the locking shaft from falling out; a limiting boss 25 is provided on the upper locking shaft 40-1 and the lower locking shaft 40-2; a spring 42 is provided between the limiting boss 25 and the assembly bracket 41; one end of the upper locking shaft 40-1 is provided with an upper locking tooth 39-1; one end of the lower locking shaft 40-2 is provided with a lower locking tooth 39-2; an outer locking gear ring 37-1 and an inner locking gear ring 37-2 are provided on the locking disk 18; when the push-pull electromagnet 11 is powered off, as Figure 22 、 23 , 24, 26, when the locking plate 18 rotates counterclockwise, its locking state is as follows Figure 24 The spring 42 pushes the upper locking shaft 40-1, and the upper locking tooth 39-1 is connected with the outer locking gear ring 37-1 by a snap connection. The locking principle diagram is shown in FIG. Figure 26 As shown, the tooth surface 39-1a on the upper locking tooth 39-1 contacts the tooth surface 37-1a on the outer locking gear ring 37-1 (the locking surface feature of the outer locking gear ring of part 18 (deformed structure)), preventing the locking plate from rotating counterclockwise. At this time, the tooth surface 39-2b on the lower locking tooth 39-2 slides with the tooth surface 37-2b ​​on the inner locking gear ring 37-2, and the lower locking shaft 40-2 is pushed to compress the spring 42, and the inner ring of the locking plate is not locked. Similarly, Figure 22 、 23 , 25, and 27, when the locking disc rotates clockwise, its locking form is as follows Figure 25 The lower locking tooth 39-2 engages with the inner locking ring gear 37-2. The tooth surface 39-2a on the lower locking tooth 39-2 contacts the tooth surface 37-2a on the inner locking ring gear 37-2 (the locking surface feature of the inner locking ring gear of component 18 (deformed structure)), preventing the locking disk from rotating clockwise. At this time, the tooth surface 39-1b on the upper locking tooth 39-1 slides with the tooth surface 37-1b on the outer locking ring gear 37-1 (the non-locking surface feature of the outer locking ring gear of component 18 (deformed structure)). The upper locking shaft 40-1 is pushed against the compression spring 42, unlocking the outer ring of the locking disk. When the push-pull electromagnet 11 is energized, the electromagnet shaft 12 moves away from the locking disk 18, driving the assembly bracket 41. Due to the action of the limit block 43, the locking shafts 40-1 and 40-2 enter the unlocked state as the assembly bracket 41 moves away from the locking disk 18.

[0026] One end of the sliding shaft 4 is provided with an external thread 29 ; one end of the ball screw 26 is provided with an internal thread 30 ; the sliding shaft 4 and the ball screw 26 are connected to each other in cooperation with the external thread 29 and the internal thread 30 .

[0027] A deflector 24 is installed between the two ends of the ball nut 20 and the ball screw 26 to form a ball screw assembly; the ball screw assembly is fixed to the main housing 15 by a locking screw plug 21 through a four-point contact ball bearing 22, and the inner ring of the four-point bearing 22 is fixed to the ball nut 20 through a hexagonal nut 23.

[0028] The locking plate 18 is evenly provided with a plurality of locking plate through holes 35; the large synchronous pulley 19 is evenly provided with a plurality of threaded holes 36; the hexagonal cylindrical head screw 33 passes through the locking plate through hole 35, and its surface is provided with an external screw thread 34 and is connected to the threaded hole 36 of the large synchronous pulley 19, so that the locking plate 18 and the large synchronous pulley 19 are installed on one end of the ball nut 20.

[0029] The push-pull electromagnet 11 is provided with an electromagnet housing 28 on its exterior. This housing 28 is mounted on the main housing 15 through an electromagnet mounting hole 27 (which is provided on the reduction housing 7). The push-pull electromagnet 11 is connected to the motor controller assembly 16 via an electromagnet wiring harness 8, which is secured to the reduction housing 7 via a wiring harness connector 10 and hexagon socket head cap screws 9.

[0030] A displacement sensor 31 is mounted on the outside of the main housing 15 via a hexagon socket head screw 32 ; the displacement sensor 31 is connected to the motor controller assembly 16 via a displacement sensor harness 17 .

[0031] One end of the ball screw 26 and one end of the sliding shaft 4 are extended to the outside and are equipped with a yoke 1 through a hexagonal flange bolt 3; the yoke 1 at one end of the sliding shaft 4 is connected to the reduction housing 7 through a stepless clamp 5 and a protective cover 2; the yoke 1 at one end of the ball screw 26 is connected to the main housing 15 through a stepless clamp 5 and a protective cover 2.

[0032] This rear-wheel steering gear with a stepped locking mechanism boasts a compact structure and ingenious design. Its transmission mechanism utilizes a highly efficient ball nut assembly, resolving the low transmission efficiency, wear, and heat generation issues of current conventional rear-wheel steering gears. Furthermore, to compensate for the lack of mechanical self-locking, a stepped locking mechanism is added. When the steering gear is powered off, the electromagnet shaft extends, preventing the large pulley from rotating. This suppresses axial movement of the ball screw, locking the rear wheels during straight-line driving. This prevents axial movement of the steering gear due to road impacts, which could cause the vehicle body to yaw and compromise driving safety. This design improves transmission efficiency while ensuring driving safety, making it a novel automotive rear-wheel steering gear solution with a stepped locking mechanism.

Claims

1. A rear wheel steering gear for an automobile with a step-locking mechanism, comprising a main housing (15), a reduction housing (7), a motor controller assembly (16) and a ball screw (26); characterized in that: The main housing (15) is provided with a reduction housing (7) at one end; a sliding shaft (4) is movably provided in the reduction housing (7) through a bushing (6); a ball screw (26) is threadedly connected to one end of the sliding shaft (4); the ball screw (26), the ball nut (20), and the reverser (24) constitute a ball screw assembly; the ball screw assembly is connected to the main housing (15) through a four-point contact ball bearing (22) and is fixed to the main housing (15) through a locking screw plug (21); one end of the ball nut (20) is threadedly connected to the main housing (15) through a locking screw plug (21); A large synchronous pulley (19) and a locking plate (18) are sequentially mounted through a hexagonal cylindrical head screw (33); a push-pull electromagnet (11) is mounted on the reduction housing (7) on one side of the locking plate (18); the push-pull electromagnet (11) is equipped with an electromagnet shaft core (12); a small synchronous pulley (14) is mounted on the main housing (15) above the large synchronous pulley (19) through a motor controller assembly (16); the small synchronous pulley (14) is connected to the large synchronous pulley (19) through a helical toothed synchronous belt (13).

2. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: The end surface of the locking disk (18) is provided with a circle of locking members (37) in a divergent shape; the locking members (37) are groove-shaped structures; the cross-sectional shapes of the locking members (37) include but are not limited to: a triangular structure, a trapezoidal structure, a rectangular structure, and a convex structure.

3. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: The locking disc (18) shown is provided with a circle of locking members (37) in a divergent shape; the locking members (37) are tooth-shaped structures; the end of the electromagnet shaft core (12) is provided with locking teeth (39); the electromagnet shaft core (12) and the locking members (37) are intermittently connected.

4. The automobile rear wheel steering gear with a step-locking mechanism according to claim 3, characterized in that: The shape of the locking member (37) includes, but is not limited to, a trapezoid, a triangle, a rectangle, and an involute.

5. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: One end of the electromagnet shaft core (12) of the push-pull electromagnet (11) is fixed with an assembly frame (41); the assembly frame (41) is slidably equipped with an upper locking shaft (40-1) and a lower locking shaft (40-2); one end of the upper locking shaft (40-1) and one end of the lower locking shaft (40-2) are both equipped with a welded limit block (43); a limit boss (25) is provided on the upper locking shaft (40-1) and the lower locking shaft (40-2); a spring (42) is provided between the limit boss (25) and the assembly frame (41); one end of the upper locking shaft (40-1) is provided with an upper locking tooth (39-1); one end of the lower locking shaft (40-2) is provided with a lower locking tooth (39-2); and an outer locking gear ring (37-1) and an inner locking gear ring (37-2) are provided on the locking plate (18).

6. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: One end of the sliding shaft (4) is provided with an external thread (29); one end of the ball screw (26) is provided with an internal thread (30); the sliding shaft (4) and the ball screw (26) are connected to each other in cooperation with the external thread (29) and the internal thread (30).

7. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: A deflector (24) is installed between the two ends of the ball nut (20) and the ball screw (26) to form a ball screw assembly; the ball screw assembly is fixed in the main housing (15) by a locking screw plug (21) through a four-point contact ball bearing (22), and the inner ring of the four-point bearing (22) is fixed to the ball nut (20) through a hexagonal nut (23).

8. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: The locking plate (18) is evenly provided with a plurality of locking plate through holes (35); the large synchronous pulley (19) is evenly provided with a plurality of threaded holes (36); the hexagonal cylindrical head screw (33) passes through the locking plate through hole (35), and the surface of the screw is provided with an external screw thread (34) and connected to the threaded hole (36) of the large synchronous pulley (19), so that the locking plate (18) and the large synchronous pulley (19) are installed on one end of the ball nut (20).

9. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: The push-pull electromagnet (11) is provided with an electromagnet housing (28) on the outside; the electromagnet housing (28) is mounted on the main housing (15) through the electromagnet mounting hole (27); the push-pull electromagnet (11) is connected to the motor controller assembly (16) through the electromagnet wiring harness (8), and the electromagnet wiring harness (8) is fixed to the reduction housing (7) through the wiring harness connector (10) and the hexagon socket head screw (9).

10. The automobile rear wheel steering gear with a step-locking mechanism according to claim 1, characterized in that: One end of the ball screw (26) and one end of the sliding shaft (4) are both extended to the outside and are equipped with a yoke (1) through a hexagonal flange bolt (3); the yoke (1) at one end of the sliding shaft (4) is connected to the reduction housing (7) through a stepless clamp (5) and a shield (2); the yoke (1) at one end of the ball screw (26) is connected to the main housing (15) through a stepless clamp (5) and a shield (2).

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