Automobile rear wheel steering gear assembly

Abstract

The utility model provides an automobile rear wheel steering gear assembly, and belongs to the technical field of automobile rear wheel steering gears. The automobile rear wheel steering gear comprises a clamping induction piece, a displacement sensor, a sliding block assembly, an O-shaped ring, a ball screw, a sliding shaft and a steering gear shell. A sliding block assembly is installed on the steering gear shell in a sliding mode through a sliding groove. A ball screw is arranged in the sliding block assembly through an O-shaped ring; the lower end of the ball screw is in threaded connection with a supporting sleeve in the steering gear shell. One end of the sliding shaft is in threaded connection with a trapezoidal screw; a trapezoidal nut is arranged on the steering gear shell on the outer side of the trapezoidal screw rod through a four-point ball bearing; the trapezoidal nut is connected with the trapezoidal screw rod; a large belt wheel is installed at one end of the trapezoidal nut in an interference press-in mode, an oil injection groove is designed in the middle of the trapezoidal nut, and oil seals are installed between the two ends of the trapezoidal nut and the trapezoidal lead screw.

Description

Technical Field

[0001] The utility model provides an automobile rear-wheel steering gear assembly, belonging to the technical field of automobile rear-wheel steering gears. Background Art

[0002] With the increasing improvement of living standards, people's requirements for the driving comfort of automobiles are also getting higher and higher. Undoubtedly, the steering performance of automobiles is the primary assessment target for driving comfort. Therefore, the rear-wheel steering technology has gradually come into people's view, which has the advantages of improving the stability of vehicles, improving maneuverability, and reducing the turning radius. The steering function of the rear wheels of an automobile is realized by driving the rear wheels to rotate through a steering gear. In the existing rear-wheel steering device, its operation requires detecting the linear displacement of a transmission rod. However, the existing displacement detection device has problems such as being easily interfered by an external magnetic field and affected by temperature, resulting in relatively low measurement accuracy, and there is a non-linear error in the relationship between the output signal and the magnetic field. Moreover, in the existing structure, the grease between the trapezoidal nut and the trapezoidal screw is prone to loss, leading to abnormal wear. Therefore, it is necessary to design a new type of rear-wheel steering gear to solve the above problems. Summary of the Invention

[0003] The purpose of the utility model is to provide an automobile rear-wheel steering gear assembly to improve the performance of the rear-wheel steering gear, including but not limited to: a displacement detection slider assembly with a compact structure and ingenious design, used to improve the displacement detection accuracy, and this displacement detection assembly also has the function of preventing the trapezoidal screw from rotating; in addition, a simple and effective grease anti-loss structure is provided to ensure that the grease is always between the trapezoidal nut and the trapezoidal screw, avoiding abnormal wear caused by the loss of grease between the trapezoidal nut and the trapezoidal screw.

[0004] The technical solution of the utility model is as follows:

[0005] An automobile rear-wheel steering gear assembly includes a clamping induction piece, a displacement sensor, a slider assembly, an O-ring, a ball head screw, a sliding shaft, a steering gear housing, a trapezoidal screw, an oil seal, and a synchronous belt reduction mechanism assembly; it is characterized in that: the slider assembly is slidably installed on the steering gear housing through a chute; the ball head screw is installed inside the slider assembly through an O-ring; the lower end of the ball head screw is threadedly connected to the sliding shaft inside the steering gear housing; the upper end of the slider assembly is equipped with a clamping induction piece; the displacement sensor is installed on the steering gear housing above the clamping induction piece; one end of the sliding shaft is threadedly connected to a trapezoidal screw; a trapezoidal nut is installed on the steering gear housing outside the trapezoidal screw through a four-point contact ball bearing; the trapezoidal nut is connected to the trapezoidal screw; a large pulley is installed at one end of the trapezoidal nut by interference press-fitting.

[0006] An oil injection hole is arranged in the middle of the trapezoidal nut.

[0007] An oil seal is installed between the two ends of the described trapezoidal nut and the trapezoidal lead screw.

[0008] The described slider assembly includes two sets of slider units; a pin and a jack are provided inside the slider unit; the two sets of slider units are interconnected through the pin and the jack to form a rectangular structure; engaging grooves are provided at both ends of the slider assembly; a ball head screw is installed inside the slider assembly through a spherical assembly hole; an O-ring is installed between the ball head screw below the spherical assembly hole and the slider assembly.

[0009] An oil storage groove is provided on the outer side of the described slider unit; the shape of the oil storage groove includes but is not limited to: X-shaped, rectangular, circular, oval, triangular, polygonal, irregular shape; a plurality of friction surfaces are provided on the slider unit outside the oil storage groove; the shape of the friction surface includes but is not limited to: rectangular, circular, oval, triangular, polygonal, irregular shape.

[0010] An operation hole is provided at the top of the described slider assembly.

[0011] A weight-reducing groove is provided on the slider unit above the described oil storage groove, and the shape of the weight-reducing groove includes but is not limited to: circular, oval, triangular, polygonal, irregular shape.

[0012] The described engaging induction piece is in an "n" shape or other shapes; elastic clamping claws are symmetrically provided inside the engaging induction piece; the bending shape of the elastic clamping claws includes but is not limited to: triangular, arc-shaped, rectangular; the elastic clamping claws are clamped and connected to the engaging groove on the slider assembly.

[0013] The described ball head screw has a rotary body structure; an assembly ball head is provided at the upper end of the ball head screw; an assembly ring groove is provided below the assembly ball head; a connecting thread is provided at the lower end of the ball head screw.

[0014] The described displacement sensor is an eddy current sensor.

[0015] The advantages of the present utility model are as follows:

[0016] The automobile rear-wheel steering gear assembly includes a novel displacement detection slider assembly, which is compact in structure and ingenious in design. By installing the engaging induction piece on the slider assembly, when the sliding shaft moves, it can drive the engaging induction piece to move together through the ball head screw, so as to achieve the purpose of detecting the displacement of the automobile rear-wheel steering gear through the eddy current sensor. In this way, the problems of low measurement accuracy and non-linear error existing in the existing displacement detection method of the automobile rear-wheel steering gear can be solved, and it is particularly suitable for detecting the displacement of the automobile rear-wheel steering gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model;

[0018] Figure 2 is Figure 1 the schematic cross-sectional structure diagram at position A in

[0019] Figure 3 is Figure 2 the explosion structure diagram of

[0020] Figure 4 the schematic structure diagram of the slider assembly of the present utility model;

[0021] Figure 5 the schematic structure diagram of the clamping induction sheet of the present utility model;

[0022] Figure 6 the schematic structure diagram of the ball head screw of the present utility model;

[0023] Figure 7 is Figure 1 the enlarged structure diagram at position B in

[0024] Figure 8 the schematic structure diagram of the single slider of the present utility model;

[0025] Figure 9 the schematic deformation structure diagram of the single slider of the present utility model;

[0026] Figure 10 the schematic deformation structure diagram of the single slider of the present utility model;

[0027] Figure 11 the schematic deformation structure diagram of the single slider of the present utility model;

[0028] Figure 12 the schematic deformation structure diagram of the single slider of the present utility model;

[0029] Figure 13 the schematic deformation structure diagram of the clamping induction sheet of the present utility model;

[0030] Figure 14 the schematic deformation structure diagram of the clamping induction sheet of the present utility model;

[0031] Figure 15 the schematic deformation structure diagram of the clamping induction sheet of the present utility model;

[0032] Figure 16 the schematic deformation structure diagram of the clamping induction sheet of the present utility model;

[0033] Figure 17 the schematic structure diagram of the trapezoidal lead screw and trapezoidal nut of the present utility model;

[0034] Figure 18 the schematic structure diagram of the oil seal of the present utility model;

[0035] Figure 19 Schematic diagram of the deformation structure of the oil seal of the present utility model;

[0036] Figure 20 Schematic diagram of the deformation structure of the oil seal of the present utility model.

[0037] In the figure: 1, steering gear housing; 2, chute; 3, slider assembly; 4, O-ring; 5, ball head screw; 6, sliding shaft; 7, clamping induction piece; 8, displacement sensor; 9, single slider; 10, clamping groove; 11, spherical assembly hole; 12, connecting thread; 13, oil storage groove; 14, friction surface; 15, operation hole; 16, weight reduction groove; 17, elastic claw; 18, assembly ball head; 19, assembly ring groove; 20, trapezoidal lead screw; 21, four-point contact ball bearing; 22, trapezoidal nut; 23, large pulley; 24, oil injection hole; 25, oil seal; 26, pin; 27, jack. Specific implementation mode

[0038] The rear-wheel steering gear assembly of the vehicle includes a clamping induction piece 7, a displacement sensor 8, a slider assembly 3, an O-ring 4, a ball head screw 5, a sliding shaft 6, a steering gear housing 1, a trapezoidal lead screw 20, an oil seal 25 and a synchronous belt reduction mechanism assembly (see the attached Figure 1 and 2 ).

[0039] The slider assembly 3 is slidably installed on the steering gear housing 1 through the chute 2 (see the attached Figure 2 ).

[0040] The slider assembly 3 includes two groups of single sliders 9; a pin 26 and a jack 27 are arranged on the inner side of the single slider 9; the two groups of single sliders 9 are connected to each other through the pin 26 and the jack 27 to form a rectangular structure (see the attached Figure 4 ).

[0041] An oil storage groove 13 is arranged on the outer side of the single slider 9; the shape of the oil storage groove 13 includes but is not limited to: X-shaped, rectangular, circular, oval, triangular, polygonal, irregular shape (see the attached Figure 4 , 9 , 10, 11 and 12). A plurality of friction surfaces 14 are arranged on the single slider 9 outside the oil storage groove 13; the shape of the friction surface 14 includes but is not limited to: rectangular, circular, oval, triangular, polygonal, irregular shape (see the attached Figure 4 , 9 , 10, 11 and 12). The single slider 9 is slidably connected to the chute 2 through the friction surface 14 with the cooperation of lubricating grease.

[0042] A weight-reducing groove 16 is provided on the slider unit 9 above the oil storage tank 13. The shape of the weight-reducing groove 16 includes, but is not limited to: circular, elliptical, triangular, polygonal, irregular shape (see the attached Figure 9 , 10 , 11 and 12).

[0043] An operation hole 15 is provided at the top of the slider assembly 3 (see the attached Figure 4 ). During operation, an assembly tool can be passed through the operation hole 15 to install the ball head screw 5.

[0044] The ball head screw 5 is installed inside the slider assembly 3 through a spherical assembly hole 11 (see the attached Figure 2 ). The ball head screw 5 has a rotary body structure; an assembly ball head 18 is provided at the upper end of the ball head screw 5; an assembly ring groove 19 is provided below the assembly ball head 18; a connecting thread 12 is provided at the lower end of the ball head screw 5 (see the attached Figure 6 ).

[0045] An O-ring 4 is installed between the assembly ring groove 19 of the ball head screw 5 below the spherical assembly hole 11 and the slider assembly 3 (see the attached Figure 2 and 3 ). The lower end of the ball head screw 5 is threadedly connected to the sliding shaft 6 inside the steering gear housing 1 through the connecting thread 12.

[0046] The purpose of setting the ball head screw 5 in this way is as follows: First, the sliding shaft 6 inside the steering gear housing 1 is fixedly connected to the ball head screw 5, so that when the sliding shaft 6 moves, it can drive the ball head screw 5 to act together; Second, under the action of the O-ring 4, there is a certain pre-tightening force connection between the assembly ball head 18 of the ball head screw 5 and the slider assembly 3, so that during normal operation, the ball head screw 5 can remain relatively fixed with the slider assembly 3, and thus the purpose that the ball head screw 5 can drive the slider assembly 3 to move together is achieved; In addition, during the assembly process, by adjusting the relative position between the slider assembly 3 and the ball head screw 5, the assembly of the slider assembly 3 and the ball head screw 5 is facilitated, and thus the problem of difficult assembly when there is a hard connection between the slider assembly 3 and the ball head screw 5 is avoided.

[0047] One end of the sliding shaft 6 is threadedly connected to a trapezoidal lead screw 20; a trapezoidal nut 22 is installed on the steering gear housing 1 outside the trapezoidal lead screw 20 through a four-point contact ball bearing 21; the trapezoidal nut 22 is connected to the trapezoidal lead screw 20; one end of the trapezoidal nut 22 is installed with a large pulley 23 by means of interference press-fitting (see the attached Figure 1 ). When the large pulley 23 drives the trapezoidal nut 22 to rotate, the trapezoidal nut 22 can drive the sliding shaft 6 to axially slide in cooperation with the trapezoidal lead screw 20.

[0048] The middle part of the trapezoidal nut 22 is provided with an oil injection hole 24; an oil seal 25 is installed between the two ends of the trapezoidal nut 22 and the trapezoidal lead screw 20 (see the attached Figure 7 , 17 , 18, 19 and 20). During assembly, grease can be injected into the interior of the trapezoidal nut 22 through the oil injection hole 24.

[0049] Clamping grooves 10 are provided at both ends of the slider assembly 3 (see the attached Figure 4 ); a clamping induction piece 7 is installed at the upper end of the slider assembly 3. The clamping induction piece 7 has an "n" - shaped structure; elastic clamping claws 17 are symmetrically arranged inside the clamping induction piece 7; the bending shapes of the elastic clamping claws 17 include but are not limited to: triangle, circular arc, rectangle (see the attached Figure 13 , 14 , 15 and 16).

[0050] The elastic clamping claws 17 are clamped and connected to the clamping grooves 10 on the slider assembly 3. The purpose of setting the clamping induction piece 7 in this way is to enable the clamping induction piece 7 to be fixedly connected to the slider assembly 3 through the elastic clamping claws 17, so as to achieve the purpose of driving the clamping induction piece 7 to move together when the slider assembly 3 moves.

[0051] A displacement sensor 8 is installed on the steering gear housing 1 above the clamping induction piece 7 (see the attached Figure 1 and 2 ). The displacement sensor 8 is an eddy current sensor. The displacement sensor 8 is an off - the - shelf component.

[0052] In the operation of this automotive rear - wheel steering gear assembly, during the movement of the sliding shaft 6 inside the steering gear housing 1, the clamping induction piece 7 can be driven to move along the sliding groove 2 through the ball - head screw 5 and the slider assembly 3. During the movement of the clamping induction piece 7, the displacement sensor 8 can record the displacement of the sliding shaft 6. In this way, the purpose of detecting the displacement of the automotive rear - wheel steering gear can be achieved.

[0053] This automotive rear - wheel steering gear assembly, the structure of which includes the grease scraping between the trapezoidal nut and the trapezoidal lead screw, and the structure with an oil injection groove designed in the middle of the nut, is simple and practical. The middle of the trapezoidal nut is designed with an oil injection groove, and oil seals are installed between the two ends of the nut and the trapezoidal lead screw. After the trapezoidal nut and the trapezoidal lead screw are assembled, grease is injected through the oil injection hole to provide lubrication. The oil seals at both ends of the trapezoidal nut always ensure that the grease at the top of the trapezoidal lead screw thread is inside the trapezoidal nut during the operation of the transmission mechanism, so as to avoid grease loss and abnormal wear of the trapezoidal nut and the trapezoidal lead screw during operation.

[0054] The rear-wheel steering gear assembly of the vehicle is compact in structure and ingenious in design. It adopts the method of installing and clamping the induction sheet 7 through the slider assembly 3, so that when the sliding shaft 6 moves, it can drive the clamping induction sheet 7 to move together through the ball head screw 5, thus achieving the purpose of detecting the displacement of the rear-wheel steering gear of the vehicle through the eddy current sensor. In this way, the problems of low measurement accuracy and non-linear error existing in the existing displacement detection method of the rear-wheel steering gear of the vehicle can be solved, and it is especially suitable for the detection of the displacement of the rear-wheel steering gear of the vehicle.

Claims

1. A rear wheel steering gear assembly for an automobile, comprising a snap-on sensing sheet (7), a displacement sensor (8), a slider assembly (3), an O-ring (4), a ball screw (5), a sliding shaft (6), a steering gear housing (1), a trapezoidal lead screw (20), an oil seal (25) and a synchronous belt speed reduction mechanism assembly; characterized in that: The steering gear housing (1) is slidably provided with a slider assembly (3) through a slide groove (2); a ball screw (5) is installed inside the slider assembly (3) through an O-ring (4); the lower end of the ball screw (5) is threadedly connected to a sliding shaft (6) inside the steering gear housing (1); a snap-fit ​​sensing sheet (7) is installed at the upper end of the slider assembly (3); a displacement sensor (8) is installed on the steering gear housing (1) above the snap-fit ​​sensing sheet (7); a trapezoidal screw rod (20) is threadedly connected to one end of the sliding shaft (6); a trapezoidal nut (22) is installed on the steering gear housing (1) outside the trapezoidal screw rod (20) through a four-point contact ball bearing (21); the trapezoidal nut (22) is connected to the trapezoidal screw rod (20); and a large pulley (23) is installed on one end of the trapezoidal nut (22) by interference fit.

2. The rear wheel steering gear assembly of an automobile according to claim 1, characterized in that: An oil filling hole (24) is provided in the middle of the trapezoidal nut (22).

3. The rear wheel steering gear assembly of an automobile according to claim 1, characterized in that: Oil seals (25) are installed between the ends of the trapezoidal nut (22) and the trapezoidal lead screw (20).

4. The rear wheel steering gear assembly of an automobile according to claim 1, characterized in that: The slider assembly (3) comprises two groups of slider single pieces (9); the inner side of the slider single piece (9) is provided with a latch (26) and a socket (27); the two groups of slider single pieces (9) are connected to each other via the latch (26) and the socket (27) to form a rectangular structure; both ends of the slider assembly (3) are provided with a clamping groove (10); a ball head screw (5) is installed inside the slider assembly (3) through a spherical assembly hole (11); an O-ring (4) is installed between the ball head screw (5) below the spherical assembly hole (11) and the slider assembly (3).

5. The rear wheel steering gear assembly of an automobile according to claim 4, characterized in that: An oil storage tank (13) is arranged on the outer side of the slider (9); the shape of the oil storage tank (13) includes but is not limited to: X-shape, rectangle, circle, ellipse, triangle, polygon, and irregular shape; a plurality of friction surfaces (14) are arranged on the slider (9) outside the oil storage tank (13); the shape of the friction surfaces (14) includes but is not limited to: rectangle, circle, ellipse, triangle, polygon, and irregular shape.

6. The rear wheel steering gear assembly of an automobile according to claim 4, characterized in that: An operating hole (15) is provided on the top of the slider assembly (3).

7. The automobile rear wheel steering gear assembly according to claim 5, characterized in that: A weight-reducing groove (16) is provided on the slider piece (9) above the oil storage tank (13). The weight-reducing groove (16) may have a shape including, but not limited to, a circle, an ellipse, a triangle, a polygon, or an irregular shape.

8. The automobile rear wheel steering gear assembly according to claim 1, characterized in that: The snap-fit ​​sensing sheet (7) is in an "n" shape; elastic claws (17) are symmetrically arranged on the inner side of the snap-fit ​​sensing sheet (7); the bending shape of the elastic claws (17) includes but is not limited to: a triangle, an arc, and a rectangle; the elastic claws (17) are snap-fitted to the snap-fit ​​grooves (10) on the slider assembly (3).

9. The automobile rear wheel steering gear assembly according to claim 1, characterized in that: The ball head screw (5) is in the form of a rotating body structure; an assembly ball head (18) is provided at the upper end of the ball head screw (5); an assembly ring groove (19) is provided below the assembly ball head (18); and a connecting thread (12) is provided at the lower end of the ball head screw (5).

10. The automobile rear wheel steering gear assembly according to claim 1, characterized in that: The displacement sensor (8) is an eddy current sensor.

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