Gap adjusting mechanism of electric control hydraulic power-assisted steering gear
By setting up a centralized bearing and floating bearing in the electrically controlled hydraulic power steering, the elastic parts and adjustment components are used to solve the problem of larger gap between the worm and the worm gear, achieving smooth transmission and no abnormal vibration vibration, and improving the overall structure stability.
Patent Information
- Application Number
- CN202420517026.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-15
AI Technical Summary
In existing electrically controlled hydraulic power steering gears, long-term operation of worm gear and worm gear leads to a larger meshing gap, resulting in larger empty stroke, poor hand feel and abnormal noise problems.
An electrically controlled hydraulic power steering gear adjustment mechanism is designed. By providing a centralized bearing and floating bearing at one end of the worm, the first and second elastic parts, adjustment components and limiting shaft shoulders are used to realize the worm's circumference of the worm gear. Closely engage to avoid side gaps.
It effectively solves the side gap problem between the worm and the worm gear, achieves smooth transmission and no abnormal noise vibration, and improves the stability of the overall structure and installation solidity.
Smart Images
Figure CN222347119U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electronically controlled hydraulic power steering devices, and relates to a clearance adjusting mechanism of electronically controlled hydraulic power steering devices. Background Art
[0002] The steering system controls the lateral movement of the vehicle, affecting the handling stability, active safety and driving comfort of the vehicle. The electric hydraulic power steering system (EHPS) is a traditional hydraulic power steering system (HPS) with a wire control part (motor, electronic control, and speed reduction mechanism) added. It is mainly used in medium and heavy commercial vehicles.
[0003] Compared with traditional HPS, EHPS has the advantages of faster steering response, lighter steering, variable power assistance with speed, active self-centering, performance and fault detection, and can also realize assisted driving functions such as lane keeping and automatic parking. It is the future development direction of steering systems for medium and heavy-duty commercial vehicles and an important part of the wire-controlled chassis.
[0004] The wire control part of the EHPS system currently generally uses a worm gear reduction and pitch increase mechanism to transmit the motor torque. In order to reduce vibration and reduce costs, the worm wheel is designed as an injection molded part and the worm is a steel part. Inevitably, long-term operation will increase the meshing clearance of the worm gear, resulting in larger idle stroke, poor feel, and abnormal noise. Utility Model Content
[0005] In view of the problems existing in the prior art, the utility model provides an electronically controlled hydraulic power steering clearance adjustment mechanism, thereby solving the technical problems in the prior art that the meshing clearance of the worm gear becomes larger due to long-term operation of the worm gear, resulting in larger idle stroke, poor feel and abnormal noise.
[0006] The utility model is realized by the following technical solutions:
[0007] An electric-controlled hydraulic power steering clearance adjustment mechanism comprises a self-aligning bearing arranged at one end of a worm of the steering gear and a floating bearing at the other end;
[0008] A first elastic member is provided on one side of the self-aligning bearing, and the first elastic member is arranged along the axial direction of the worm;
[0009] An adjusting mechanism is arranged on one side of the floating bearing, and the worm can rotate around the worm wheel of the steering gear under the action of the self-aligning bearing and the adjusting mechanism.
[0010] Preferably, a first limit shoulder is provided on the inner wall of the steering gear shell, a second limit shoulder is provided on the side wall of the worm, and one axial side of the self-aligning bearing is abutted against the first limit shoulder and the second limit shoulder at the same time; the first elastic member is arranged on the other axial side of the self-aligning bearing.
[0011] Preferably, an inner ring of the self-aligning bearing and the worm are interference fit, and an outer ring of the self-aligning bearing and the housing are interference fit.
[0012] Preferably, the adjustment mechanism comprises a floating bearing and an adjustment assembly sequentially arranged on one side of the floating bearing, an inner ring of the floating bearing is interference fit with the worm, and an outer ring of the floating bearing abuts against the adjustment mechanism.
[0013] Preferably, the adjustment assembly includes a self-aligning positioning pin and a self-aligning bolt which are arranged in sequence along the radial direction of the worm, and a second elastic member is sleeved on the self-aligning bolt, one end of the second elastic member abuts against the self-aligning positioning pin, and the other end abuts against the self-aligning bolt, and the self-aligning positioning pin abuts against the floating bearing.
[0014] Preferably, the self-aligning positioning pin is provided with a third limiting shoulder, and the second elastic member abuts against the third limiting shoulder.
[0015] Preferably, a self-aligning plastic bushing is sleeved on the outer side of the floating bearing, the self-aligning plastic bushing is provided with a through hole, the self-aligning positioning pin passes through the through hole and abuts against the floating bearing; the self-aligning plastic bushing is also provided with a plurality of second O-rings.
[0016] Preferably, a worm plug is further provided at one end of the worm, and a third O-ring is provided on the worm plug; a first O-ring is sleeved on the self-aligning bolt; and the worm plug is arranged at one end of the adjusting mechanism.
[0017] Preferably, a buffer assembly and a buffer pressure plate are further provided between the worm plug and the self-aligning plastic bushing.
[0018] An electronically controlled hydraulic power steering gear comprises the above-mentioned electronically controlled hydraulic power steering gear clearance adjustment mechanism.
[0019] Compared with the prior art, the utility model has the following beneficial technical effects:
[0020] The utility model discloses an adjustment mechanism for an electrically controlled hydraulic power steering gear, wherein a self-aligning bearing is arranged at one end of a worm, and a floating bearing is arranged at the other end; a first elastic member on one side of the self-aligning bearing can be used to tightly support the worm; the self-aligning bearing is arranged at the same time so that the worm can rotate around the self-aligning bearing at a certain angle; the floating bearing and an adjustment mechanism arranged on one side of the floating bearing can make the side of the worm close to or away from the worm wheel, so that the worm rotates around the worm wheel of the steering gear as a whole; therefore, the worm is always meshed with the worm wheel without side clearance, so that the transmission is stable without abnormal noise or vibration.
[0021] Furthermore, a first limit shoulder is provided on the inner wall of the steering gear shell, and a second limit shoulder is provided on the side wall of the worm gear. One axial side of the self-aligning bearing is abutted against the first limit shoulder and the second limit shoulder at the same time; the first elastic member is provided on the other axial side of the self-aligning bearing, thereby effectively fixing the self-aligning bearing.
[0022] Furthermore, the inner ring of the self-aligning bearing and the worm are in interference fit, and the outer ring of the self-aligning bearing and the housing are in interference fit, so that the installation of the self-aligning bearing is more stable and the overall structure is more stable.
[0023] Furthermore, the adjustment mechanism includes a floating bearing and an adjustment component sequentially arranged on one side of the floating bearing. The inner ring of the floating bearing is interference fit with the worm, and the outer ring of the floating bearing abuts against the adjustment mechanism, so that the assembly of the floating bearing is more stable and shaking is avoided.
[0024] Furthermore, the adjustment assembly includes a self-aligning positioning pin and a self-aligning bolt which are arranged in sequence along the radial direction of the worm, and a second elastic member is sleeved on the self-aligning bolt. One end of the second elastic member abuts against the self-aligning positioning pin, and the other end abuts against the self-aligning bolt. The self-aligning positioning pin abuts against the floating bearing. Here, the self-aligning positioning pin, the self-aligning bolt and the second elastic member effectively realize the adjustment of the position of the worm.
[0025] Furthermore, a third limiting shoulder is provided on the self-aligning positioning pin, and the second elastic member abuts against the third limiting shoulder, and the third limiting shoulder effectively realizes the fixed installation of the second elastic member.
[0026] Furthermore, a self-aligning plastic bushing is sleeved on the outer side of the floating bearing, and a through hole is provided on the self-aligning plastic bushing, and the self-aligning positioning pin passes through the through hole and abuts against the floating bearing; a plurality of second O-rings are also provided on the self-aligning plastic bushing. The arrangement of the self-aligning plastic bushing and the plurality of second O-rings here effectively supports the floating bearing.
[0027] Furthermore, a worm plug is provided at one end of the worm, and a third O-ring is provided on the worm plug; a first O-ring is sleeved on the self-aligning bolt; the worm plug is arranged at one end of the adjusting mechanism, and the arrangement of the worm plug here plays an effective fixing role on the worm, and the third O-ring and the first O-ring play an effective sealing role.
[0028] Furthermore, a buffer assembly and a buffer pressure plate are provided between the worm plug and the self-aligning plastic bushing, wherein the buffer assembly and the buffer pressure plate play a certain degree of buffering and eliminating effect on axial vibration. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0030] Figure 1 This is a structural schematic diagram of a gap adjustment mechanism of an electronically controlled hydraulic power steering device in the utility model;
[0031] Figure 2 For the utility model Figure 1 The enlarged view of point A in the middle;
[0032] Figure 3 For the utility model Figure 1 The enlarged view of point B in the middle;
[0033] Wherein: 1. housing, 2. buffer assembly, 3. self-aligning locating pin, 4. self-aligning bolt, 5. first O-ring, 6. second elastic member, 7. floating bearing, 8. worm, 9. self-aligning bearing, 10. first elastic member, 11. worm wheel, 12. self-aligning plastic bushing, 13. second O-ring, 14. buffer pressure plate, 15. third O-ring, 16. worm plug, 101. first limit shoulder, 81. second limit shoulder, 31. third limit shoulder. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0037] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0038] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0039] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0040] The utility model is further described in detail below with reference to the accompanying drawings:
[0041] like Figure 1 As shown, the utility model discloses an electric-controlled hydraulic power steering clearance adjustment mechanism, comprising a self-aligning bearing 9 arranged at one end of a worm 8 of the steering gear and a floating bearing 7 at the other end; a first elastic member 10 is arranged on one side of the self-aligning bearing 9, and the first elastic member 10 is arranged along the axial direction of the worm 8; an adjustment mechanism is arranged on one side of the floating bearing 7, and the worm 8 can rotate around a worm wheel 11 of the steering gear under the action of the self-aligning bearing 9 and the adjustment mechanism. The first elastic member 10 can be a retaining spring.
[0042] like Figure 2 As shown, in a preferred embodiment, the inner wall of the steering gear housing 1 is provided with a first limit shoulder 101, the side wall of the worm 8 is provided with a second limit shoulder 81, and one axial side of the self-aligning bearing 9 is abutted against the first limit shoulder 101 and the second limit shoulder 81 at the same time; the first elastic member 10 is arranged on the other axial side of the self-aligning bearing 9.
[0043] Further preferably, the inner ring of the self-aligning bearing 9 and the worm 8 have an interference fit, and the outer ring of the self-aligning bearing 9 and the housing 1 have an interference fit, so that the installation of the self-aligning bearing 9 is more stable and the overall structure is more stable.
[0044] In a feasible embodiment, the adjustment mechanism includes a floating bearing 7 and an adjustment component sequentially arranged on one side of the floating bearing 7, the inner ring of the floating bearing 7 is interference fit with the worm 8, and the outer ring of the floating bearing 7 abuts against the adjustment mechanism. The adjustment component includes a self-aligning positioning pin 3 and a self-aligning bolt 4 sequentially arranged along the radial direction of the worm 8, and a second elastic member 6 is sleeved on the self-aligning bolt 4, one end of the second elastic member 6 abuts against the self-aligning positioning pin 3, and the other end abuts against the self-aligning bolt 4, and the self-aligning positioning pin 3 abuts against the floating bearing 7. The second elastic member 6 can be a spring.
[0045] like Figure 3 As shown, in a preferred embodiment, in order to make it easier to fix the second elastic member 6 , a third limiting shoulder 31 is provided on the self-aligning positioning pin 3 , and the second elastic member 6 abuts against the third limiting shoulder 31 .
[0046] In addition, in order to support the floating bearing 7, a self-aligning plastic bushing 12 is sleeved on the outer side of the floating bearing 7. The self-aligning plastic bushing 12 is provided with a through hole, and the self-aligning positioning pin 3 passes through the through hole to abut against the floating bearing 7; the self-aligning plastic bushing 12 is also provided with a plurality of second O-rings 13.
[0047] In order to fix the worm 8, a worm plug 16 is provided at one end of the worm 8, and a third O-ring 15 is provided on the worm plug 16; a first O-ring 5 is sleeved on the self-aligning bolt 4; and the worm plug 16 is arranged at one end of the adjusting mechanism.
[0048] A buffer assembly 2 and a buffer pressure plate 14 are further provided between the worm plug 16 and the self-aligning plastic bushing 12 .
[0049] In addition, the utility model also discloses an electronically controlled hydraulic power steering device including the clearance adjustment mechanism.
[0050] The self-aligning bearing in the utility model is a special bearing whose roller raceway is spherical and can adapt to the angular deviation between the axis center lines of the two raceways and the angular motion of the bearing. This bearing can also be called a spherical bearing because its outer ring is an arc surface. Due to the design of this arc surface, the self-aligning bearing can not only realize axial rotation, but also realize a certain angle of swing in the radial direction. When the outer ring is fixed, this swing is reflected in the adjustable axis center line of the inner ring.
[0051] The floating bearing in the utility model is also called a full floating bearing. In this bearing, there is a certain gap between the rotor shaft and the housing bearing. When the rotor shaft rotates at high speed, the lubricating oil fills the two gaps to form an inner and outer oil film, so that the floating bearing rotates in the same direction as the rotor shaft, but its speed is lower than that of the rotor shaft.
[0052] To further explain in detail, in the present invention, the worm wheel 11 and the worm 8 are meshed with each other, the inner ring of the self-aligning bearing 9 and the worm 8 are interference fit, the outer ring of the self-aligning bearing 9 and the housing 1 are interference fit, the first elastic member 10 is clamped in the housing 1 to axially position the self-aligning bearing 9, the inner ring of the floating bearing 7 and the worm 8 are interference fit, the outer ring of the floating bearing 7 and the self-aligning plastic bushing 12 are clearance fit, and four second O-rings 13 are sleeved on the self-aligning plastic bushing 12 and assembled and compressed. In the housing 1, one end of the self-aligning positioning pin 3 is pressed against the outer ring of the floating bearing 7, the self-aligning spring 6 is sleeved on the self-aligning positioning pin 3 and pre-compressed by the self-aligning bolt 4, the first O-ring 5 is sleeved on the self-aligning bolt 4, the buffer assembly 2 is compressed in one end of the self-aligning plastic bushing 12 and protrudes a certain height from the end face of the self-aligning plastic bushing 12, the worm plug 16 is threadedly connected to the housing 1, the worm plug 16 generates a certain compression force on the buffer assembly 2 through the buffer pressure plate 14, and the third O-ring 15 is sleeved on the worm plug 16.
[0053] The working principle of the utility model is as follows: a self-aligning bearing 9 is arranged at one end of the worm 8 so that the worm 8 can rotate around the self-aligning bearing 9 by a certain angle, and a floating bearing 7 is arranged at the other end of the worm 8. The floating bearing 7 is floatingly supported in the housing by a self-aligning plastic bushing 12 and four second O-rings 13. The outer ring of the floating bearing 7 is pre-compressed by the self-aligning positioning pin 3 and the second elastic member 6. Once a relative gap is generated between the worm wheel 11 and the worm 8, the second elastic member 6 will press the worm 8 toward the direction of the worm wheel 11 so that the gap can be eliminated. The pre-compression of the second elastic member 6 enables the worm 8 to always achieve a side clearance-free meshing with the worm wheel 11. The buffer assembly 2 is compressed in one end of the self-aligning plastic bushing 12 and protrudes a certain height from the end face of the self-aligning plastic bushing 12. The worm plug 16 generates a certain compression force on the buffer assembly 2 through the buffer pressure plate 14, so that the axial vibration is buffered and eliminated to a certain extent. The first O-ring 5 and the third O-ring 15 both play a sealing role.
[0054] The present invention arranges a self-aligning bearing at one end of the worm so that the worm can rotate around the self-aligning bearing at a certain angle, and arranges a floating bearing at the other end of the worm. The floating bearing is floatingly supported in a housing by a self-aligning plastic bushing and four O-rings. The outer ring of the floating bearing is pre-compressed by a self-aligning positioning pin and a second elastic member. The pre-compression of the second elastic member ensures that the worm is always meshed with the worm wheel without side clearance, and the transmission is smooth without abnormal noise or vibration.
[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An electronically controlled hydraulic power steering clearance adjustment mechanism, characterized in that: It comprises a self-aligning bearing (9) arranged at one end of a worm (8) of a steering gear and a floating bearing (7) at the other end; A first elastic member (10) is provided on one side of the self-aligning bearing (9), and the first elastic member (10) is arranged along the axial direction of the worm (8); An adjusting mechanism is provided on one side of the floating bearing (7), and the worm (8) can rotate around the worm wheel (11) of the steering gear under the action of the self-aligning bearing (9) and the adjusting mechanism.
2. The gap adjustment mechanism of an electronically controlled hydraulic power steering gear according to claim 1, characterized in that: A first limiting shoulder (101) is provided on the inner wall of the housing (1) of the steering gear, a second limiting shoulder (81) is provided on the side wall of the worm (8), and one axial side of the self-aligning bearing (9) is abutted against both the first limiting shoulder (101) and the second limiting shoulder (81); the first elastic member (10) is provided on the other axial side of the self-aligning bearing (9).
3. The gap adjustment mechanism of an electronically controlled hydraulic power steering gear according to claim 1, characterized in that: An inner ring of the self-aligning bearing (9) and the worm (8) are in interference fit, and an outer ring of the self-aligning bearing (9) and the housing (1) are in interference fit.
4. The gap adjustment mechanism of an electronically controlled hydraulic power steering gear according to claim 1, characterized in that: The adjustment mechanism comprises a floating bearing (7) and an adjustment component arranged in sequence on one side of the floating bearing (7); an inner ring of the floating bearing (7) is interference-fitted with the worm (8); and an outer ring of the floating bearing (7) abuts against the adjustment mechanism.
5. The electronically controlled hydraulic power steering clearance adjustment mechanism according to claim 4, characterized in that: The adjustment assembly comprises a self-aligning positioning pin (3) and a self-aligning bolt (4) which are arranged in sequence along the radial direction of the worm (8); a second elastic member (6) is sleeved on the self-aligning bolt (4); one end of the second elastic member (6) abuts against the self-aligning positioning pin (3), and the other end abuts against the self-aligning bolt (4); the self-aligning positioning pin (3) abuts against the floating bearing (7).
6. The electronically controlled hydraulic power steering clearance adjustment mechanism according to claim 5, characterized in that: The centering positioning pin (3) is provided with a third limiting shoulder (31), and the second elastic member (6) abuts against the third limiting shoulder (31).
7. The electronically controlled hydraulic power steering clearance adjustment mechanism according to claim 5, characterized in that: The outer side of the floating bearing (7) is also sleeved with a self-aligning plastic bushing (12), the self-aligning plastic bushing (12) is provided with a through hole, the self-aligning positioning pin (3) passes through the through hole and abuts against the floating bearing (7); the self-aligning plastic bushing (12) is also provided with a plurality of second O-rings (13).
8. The electronically controlled hydraulic power steering clearance adjustment mechanism according to claim 5, characterized in that: One end of the worm (8) is also provided with a worm plug (16), and a third O-ring (15) is provided on the worm plug (16); a first O-ring (5) is sleeved on the self-aligning bolt (4); and the worm plug (16) is arranged at one end of the adjustment mechanism.
9. The electronically controlled hydraulic power steering clearance adjustment mechanism according to claim 8, characterized in that: A buffer assembly (2) and a buffer pressure plate (14) are also provided between the worm plug (16) and the self-aligning plastic bushing (12).
10. An electronically controlled hydraulic power steering device, characterized in that: It comprises an electronically controlled hydraulic power steering clearance adjustment mechanism as described in any one of claims 1 to 9.