Worm and gear gap adjusting mechanism and electric control hydraulic power steering system

Abstract

The utility model discloses a worm and gear clearance adjusting mechanism and an electric control hydraulic power steering system, the clearance adjusting mechanism comprises a shell, a worm and a worm gear, the worm and the worm gear are rotatably arranged in the shell, the worm and the worm gear are meshed with each other, the worm is coaxially connected with a motor output shaft, and the rear end of the worm is sleeved with an end bearing; a wear-resistant bushing is sleeved outside the end part bearing; a first mounting hole is formed in the position, corresponding to the end bearing, of the shell, an adjusting plug is arranged in the first mounting hole in a penetrating mode, and the end, facing the end bearing, of the adjusting plug penetrates through the abrasion-resistant bush to make contact with the end bearing. The adjusting plug comprises a first connecting section, a transition section and a second connecting section which are integrally connected in sequence, and the first connecting section can be in threaded connection with the first mounting hole. The adjusting plug can move in the first mounting hole through manual adjustment, so that the worm gear can still be tightly combined with the worm after being abraded, vibration and noise caused by abrasion of the worm gear are reduced, and the overall structural stability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of the assembly of the electric control hydraulic steering system for automobiles, and particularly relates to a worm and worm gear clearance adjusting mechanism and an electric control hydraulic power steering system. Background Technique

[0002] The electric control hydraulic power steering system for commercial vehicles usually consists of key components such as a motor assembly, a controller assembly, a worm and worm gear reduction mechanism assembly, and a recirculating ball steering gear assembly. Due to the characteristics of the worm and worm gear, such as compact structure, large transmission ratio, stable transmission, and low noise, the existing reduction mechanisms of the electric control hydraulic power steering system generally adopt the worm and worm gear structure. However, the worm teeth are continuous without interruption, and when meshing with the worm gear teeth, it is continuous, and there is no process of the worm teeth entering or exiting the meshing. Therefore, the heat generation of the worm and worm gear transmission is large and the tooth surface is easy to wear, which will cause an increase in the meshing clearance of the worm and worm gear and unstable transmission during operation, thus reducing the service life of the electric control hydraulic power steering system and urgently needing improvement. Content of the Utility Model

[0003] Aiming at the technical problems existing at the present stage, the purpose of the utility model is to provide a worm and worm gear clearance adjusting mechanism and an electric control hydraulic power steering system to solve the technical problem of unstable transmission caused by the wear of the worm and worm gear in the existing electric control hydraulic power steering system, resulting in clearance.

[0004] In order to achieve the above purpose, the utility model discloses the following technical solutions:

[0005] A worm and worm gear clearance adjusting mechanism includes a housing, a worm and a worm gear rotatably arranged in the housing, the worm and the worm gear are meshed with each other, the front end of the worm is coaxially connected with the output shaft of the motor, and an end bearing is sleeved on the rear end of the worm; a wear-resistant bushing is sleeved outside the end bearing;

[0006] A first mounting hole is formed in the housing corresponding to the position of the end bearing, an adjusting plug is inserted into the first mounting hole, and one end of the adjusting plug facing the end bearing passes through the wear-resistant bushing and contacts the end bearing.

[0007] The utility model also has the following technical features:

[0008] Specifically, the adjusting plug includes a first connection section, a transition section and a second connection section which are integrally and sequentially connected. An external thread is arranged on the outer wall of the first connection section, an internal thread is arranged on the inner wall of the first mounting hole, and the first connection section is threadedly connected with the first mounting hole.

[0009] Furthermore, the wear-resistant bushing is radially and throughly provided with a second mounting hole, and the second connection section can pass through the second mounting hole to contact the end bearing.

[0010] Furthermore, a self-aligning bearing is sleeved on the front end of the worm, and the inner wall of the self-aligning bearing is in contact with the outer wall of the worm.

[0011] Furthermore, a snap ring is arranged at the front end of the self-aligning bearing, and the snap ring is connected to the housing.

[0012] Furthermore, a coupling is also arranged at the input end of the worm, and the input end of the worm and the output end of the motor are respectively inserted into both ends of the coupling.

[0013] The present invention also protects an electronically controlled hydraulic power steering system, and the system is provided with the above-mentioned worm and gear clearance adjusting mechanism.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] By adjusting the position of the adjusting plug provided, the worm gear can still be tightly combined with the worm after wear, reducing the vibration and noise caused by the wear of the worm gear material and improving the stability of the overall structure; the ordinary bearing at the front end of the worm is replaced by a self-aligning bearing, allowing the worm to offset a certain angle, which can better support the rotation of the worm, effectively preventing the radial force generated by the bearing at the front end of the worm on the housing after clearance adjustment, ensuring the tight meshing of the worm and gear, making the assembly structure more stable, and improving the service life of the power steering system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the following specific embodiments, but do not constitute a limitation to the present disclosure.

[0017] Figure 1 is a cross-sectional view of the utility model;

[0018] Figure 2 is an exploded view of the utility model;

[0019] Figure 3 is a schematic structural view of the wear-resistant bushing;

[0020] Figure 4 is a schematic structural view of the adjusting plug;

[0021] Figure 5 is a partial structural view of the utility model.

[0022] Reference numerals in the drawings:

[0023] 1 - housing, 2 - worm, 3 - worm gear, 4 - motor, 5 - end bearing, 6 - wear-resistant bushing, 7 - adjusting plug, 8 - self-aligning bearing, 9 - snap ring, 10 - coupling;

[0024] 61 - Second mounting hole; 71 - First connecting section, 72 - Transition section, 73 - Second connecting section.

[0025] The following specific embodiments will describe this solution in detail. Specific embodiments

[0026] The following specific embodiments of the present invention are given. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0027] The terms "upper", "lower", "front", "rear", "top", "bottom", etc. used in the present invention to indicate the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. "Inner" and "outer" refer to the inside and outside of the corresponding component contour, and the above terms should not be construed as limitations to the present invention.

[0028] In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0029] In the present invention, unless otherwise stated, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Unless otherwise specified, the components in the present invention can be purchased from the market.

[0031] Embodiment 1

[0032] Complying with the above technical solution, as Figures 1 to 3 shown, this embodiment discloses a worm and worm gear clearance adjusting mechanism, which includes a housing 1, a worm 2 and a worm gear 3 rotatably arranged in the housing 1. The worm 2 and the worm gear 3 are meshed with each other. The front end of the worm 2 is coaxially connected to the output shaft of the motor 4, and the rear end of the worm 2 is sleeved with an end bearing 5, and a wear-resistant bushing 6 is sleeved outside the end bearing 5; the worm 2 is fixed on the upper cover of the housing 1 by a snap ring.

[0033] A first mounting hole is provided in the housing 1 at a position corresponding to the end bearing 5. An adjusting plug 7 is inserted into the first mounting hole. One end of the adjusting plug 7 facing the end bearing 5 passes through the wear-resistant bushing 6 and contacts the end bearing 5. In this embodiment, the axis of the first mounting hole is perpendicular to the axis of the worm 2 and lies in the same plane. The wear-resistant bushing 6 can reduce the friction between the end bearing 5 and the housing 1 and improve the service life of the end bearing 5.

[0034] As a preferred solution of this embodiment, the adjusting plug 7 includes a first connecting section 71, a transition section 72, and a second connecting section 73 that are integrally and sequentially connected. The first connecting section 71 and the second connecting section 73 are connected by the transition section 72. An external thread is provided on the outer wall of the first connecting section 71, and an internal thread matching the external thread is provided on the inner wall of the first mounting hole. The first connecting section 71 is threadedly connected to the first mounting hole.

[0035] As a preferred solution of this embodiment, the wear-resistant bushing 6 is radially provided with a second mounting hole 61. The second connecting section 73 can pass through the second mounting hole 61 and contact the end bearing 5, and can apply a radial force to the end bearing 5. When the worm gear 3 and the worm 2 are engaged in transmission, the adjusting plug 7 provides a radial force for the worm 2, pressing the worm 2 against the worm gear 3 all the time to eliminate the transmission gap between the two. Specifically, it includes: the magnitude of the axial force can be adjusted by adjusting the insertion position of the adjusting plug 7 in the first mounting hole to compensate for and eliminate the increased gap due to wear, so as to meet the assembly and adjustment performance, and further eliminate noise and abnormal noise.

[0036] As a preferred solution of this embodiment, a self-aligning bearing 8 is sleeved on the front end of the worm 2, and the inner wall of the self-aligning bearing 8 is in contact with the outer wall of the worm 2. The self-aligning bearing 8 is press-fitted on the front end of the worm 2 to support the worm 2, enabling the axis of the worm 2 to deflect a certain angle to reduce the axial force between the worm 2 and the housing 1, so that the worm 2 will not be restricted, and at the same time, the swing amount does not affect the preloading effect of the worm 2.

[0037] As a preferred solution of this embodiment, a snap ring 9 is provided at the front end of the self-aligning bearing 8, and the snap ring 9 is connected to the housing 1. The snap ring 9 is used for the axial limit of the self-aligning bearing 8.

[0038] As a preferred solution of this embodiment, a coupling 10 is further provided at the input end of the worm 2, and the input end of the worm 2 and the output end of the motor 4 are respectively inserted into both ends of the coupling 10.

[0039] When the utility model is in use:

[0040] During assembly, the adjusting plug is inserted into the first mounting hole. The first connecting section 71 is threadedly connected to the first mounting hole. One end of the adjusting plug 7 facing the end bearing 5, i.e., the second connecting section 73, passes through the second mounting hole 61 and is connected to the end bearing 5. After assembly, by manually tightening or loosening the adjusting plug 7, the adjusting plug 7 can move axially along the first mounting hole in the first mounting hole, automatically adjusting the clearance between the worm and the worm gear, and further realizing the position adjustment of the end bearing 5 and the worm 22. When the worm wheel 3 wears after working for a period of time, a clearance is generated between the worm wheel 3 and the worm 2. By manually tightening the adjusting plug 7, a radial force is applied to the worm 2, causing the worm 2 to also move closer to the worm wheel 2 until the force balance is reached, and the technical purpose of automatic clearance compensation is achieved.

[0041] In summary, by adjusting the position of the provided adjusting plug, the present utility model enables the worm wheel to still be tightly combined with the worm after wear, reduces the vibration and noise caused by the wear of the worm wheel material, and improves the stability of the overall structure. The ordinary bearing at the front end of the worm is replaced with a self-aligning bearing, allowing the worm to deflect a certain angle, which can better support the rotation of the worm, effectively prevent the radial force on the housing from the front-end bearing of the worm after clearance adjustment, ensure the tight meshing of the worm and the worm wheel, and make the assembly structure more stable.

[0042] Embodiment 2

[0043] This embodiment discloses an electronically controlled hydraulic power steering system, which is provided with the worm and worm wheel clearance adjustment mechanism disclosed in Embodiment 1.

[0044] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0045] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0046] Furthermore, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A worm and worm gear clearance adjusting mechanism, comprising a housing (1), a worm (2) and a worm gear (3) rotatably arranged in the housing (1), the worm (2) and the worm gear (3) being meshed with each other, the front end of the worm (2) being coaxially connected to the output shaft of a motor (4), and an end bearing (5) being sleeved on the rear end of the worm (2), characterized in that, The outer sleeve of the end bearing (5) is provided with a wear-resistant bushing (6); A first mounting hole is provided in the housing (1) corresponding to the position of the end bearing (5). An adjusting plug (7) is inserted through the first mounting hole, and one end of the adjusting plug (7) facing the end bearing (5) passes through the wear-resistant bushing (6) and contacts the end bearing (5); The adjusting plug (7) includes a first connecting section (71), a transition section (72), and a second connecting section (73) that are integrally and sequentially connected. An external thread is provided on the outer wall of the first connecting section (71), and an internal thread is provided on the inner wall of the first mounting hole. The first connecting section (71) is threadedly connected to the first mounting hole.

2. The worm and worm gear clearance adjusting mechanism according to claim 1, characterized in that, The wear-resistant bushing (6) is radially and throughly provided with a second mounting hole (61), and the second connecting section (73) can pass through the second mounting hole (61) to contact the end bearing (5).

3. The worm gear and worm clearance adjusting mechanism according to claim 1, characterized in that A self-aligning bearing (8) is sleeved on the front end of the worm (2), and the inner wall of the self-aligning bearing (8) is in contact with the outer wall of the worm (2).

4. The worm gear and worm clearance adjusting mechanism according to claim 3, characterized in that, A snap ring (9) is provided at the front end of the self-aligning bearing (8), and the snap ring (9) is connected to the housing (1).

5. The worm and worm gear clearance adjusting mechanism according to claim 1, characterized in that, A coupling (10) is further provided at the input end of the worm (2). The input end of the worm (2) and the output end of the motor (4) are respectively inserted into both ends of the coupling (10).

6. An electronically controlled hydraulic power steering system, characterized in that, The electro-hydraulic power steering system is provided with the worm and gear clearance adjusting mechanism according to any one of claims 1 to 5.

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