Piston anti-rotation structure
By setting an anti-rotation protrusion and a groove between the shock absorber end cap and the piston, the problem of relative rotation between the piston and the shock absorber is solved, achieving noise reduction and seal protection, and is suitable for air spring systems.
Patent Information
- Application Number
- CN202422974960.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-04
AI Technical Summary
During suspension operation, the relative rotation between the piston and the shock absorber causes abnormal noise and air leakage due to wear of the seals, which cannot be resolved by traditional anti-rotation features, especially in some cases.
An anti-rotation protrusion and anti-rotation groove are provided between the shock absorber end cap and the piston. The anti-rotation torque is set by the interference fit to prevent the piston from rotating relative to the piston.
It effectively prevents relative rotation between the piston and the shock absorber, reduces noise risk and seal wear, and improves system stability.
Smart Images
Figure CN223609183U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to air spring technical field especially relates to a piston anti -rotation structure. BACKGROUND
[0002] At present, in the field of passenger cars or commercial vehicles, during the movement of the suspension bounce and steering, the upper connecting part of the air spring bag and the lower connecting part of the bag produce relative movement, due to the deformation and friction of the bag, the piston has a relative torsion tendency relative to the shock absorber, and without limiting, the relative rotation between the piston and the shock absorber is prone to occur, and the relative rotation between the piston and the shock absorber is prone to produce abnormal noise and seal ring wear and leakage. At present, the anti-rotation feature is increased at the matching position of the lower end of the piston and the spring disc of the shock absorber, such as the matching of the conical surface, the concave-convex feature, to produce the effect of anti-rotation.
[0003] In some cases, such as the position of the shock absorber spring disc or the lower end of the piston, due to the limitation of space arrangement, performance requirement, product strategy and other restrictions, the anti-rotation feature cannot be increased, or some shock absorbers have no spring disc. In these cases, the lower end surface of the piston and the shock absorber cannot be prevented from rotating, and there is a risk of noise. SUMMARY
[0004] In order to solve the technical problems in the background art, the utility model provides a piston anti-rotation structure.
[0005] The utility model discloses a kind of piston anti-rotation structures, including mutually matched anti-rotation boss and anti-rotation slot, one of the anti-rotation boss and the anti-rotation slot is provided on shock absorber end cover, another is provided on piston.
[0006] Preferably, the shock absorber end cover is interference-pressed on the top of the shock absorber, and the upper part of the piston is sleeved on the outer side of the shock absorber end cover.
[0007] Preferably, the anti-rotation boss is provided on the inner wall of the piston in contact with the shock absorber end cover, and the anti-rotation slot is provided on the outer wall of the shock absorber end cover in contact with the piston.
[0008] Preferably, the size of anti-rotation torque is set by the interference amount between the shock absorber end cover and the shock absorber.
[0009] In conclusion, the utility model has the following beneficial effects: in some cases where anti-rotation features cannot be arranged between the lower end surface of the piston and the shock absorbing air spring, the present scheme adopts the anti-rotation structure of setting anti-rotation boss and anti-rotation slot in cooperation between the shock absorber end cover and the piston, realizes the effect of piston anti-rotation, and reduces the risk of noise.
[0010] The additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 Assembling relationship between the piston, the shock absorber end cover and the shock absorber of the embodiment of the present application is shown in the figure.
[0012] Figure 2 The top view of the anti-rotation structure of the piston of the embodiment of the present application.
[0013] In the figure:
[0014] 1, shock absorber end cover; 1-1, anti-rotation protrusion; 2, piston; 2-1, anti-rotation clamping groove; 3, shock absorber. DETAILED DESCRIPTION
[0015] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar symbols represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.
[0016] As Figures 1-2 shown, the anti-rotation structure of the piston of the embodiment comprises the anti-rotation protrusion 1-1 and the anti-rotation clamping groove 2-1 which cooperate with each other, one of the anti-rotation protrusion 1-1 and the anti-rotation clamping groove 2-1 is arranged on the shock absorber end cover 1, and the other is arranged on the piston 2.
[0017] In this way, in the case that the anti-rotation feature cannot be arranged between the lower end surface of the piston and the shock absorber spring, the anti-rotation structure of the anti-rotation protrusion 1-1 and the anti-rotation clamping groove 2-1 arranged between the shock absorber end cover 1 and the piston 2 is adopted in the embodiment, the effect of anti-rotation of the piston is achieved, and the risk of generating noise is reduced.
[0018] Further, the shock absorber end cover 1 is interference-pressed on the top of the shock absorber 3, and the upper part of the piston 2 is sleeved on the outside of the shock absorber end cover 1.
[0019] Further, in different projects, the size of the anti-rotation torque can be set by the interference amount between the shock absorber end cover 1 and the shock absorber 3.
[0020] In the first specific embodiment, as Figure 1As shown, the anti-rotation protrusion 1-1 is arranged on the inner wall of the piston 2 which is in contact with the shock absorber end cover 1, and the anti-rotation clamping groove 2-1 is arranged on the outer wall of the shock absorber end cover 1 which is in contact with the piston 2. When the bladder pushes the piston 2 to rotate, the piston 2 is prevented from rotating by the shock absorber end cover 1 due to the arrangement of the anti-rotation structure between the piston 2 and the shock absorber end cover 1, and the shock absorber end cover 1 is prevented from rotating by the shock absorber 3 through the interference generated resistance, thereby forming the effect of preventing relative rotation between the piston 2 and the shock absorber 3.
[0021] It should be noted that in the second embodiment, the anti-rotation clamping groove 2-1 can also be arranged on the inner wall of the piston 2 which is in contact with the shock absorber end cover 1, and the anti-rotation protrusion 1-1 is arranged on the outer wall of the shock absorber end cover 1 which is in contact with the piston 2. The specific arrangement depends on the situation. The anti-rotation effect is the same as that in the first embodiment described above, which will not be repeated here.
[0022] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0023] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0024] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0025] In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under" can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature is on second feature "on", "above" and "on" can be first feature is on second feature directly or obliquely, or only indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "under" can be first feature is on second feature directly or obliquely, or only indicate first feature horizontal height is less than second feature.
[0026] The above merely describes a preferred specific embodiment of the present application, but the scope of protection of the present application is not limited to this. Any person skilled in the art, within the technical range disclosed by the present application, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or changes, should be covered within the scope of protection of the present application.
Claims
1. A piston anti-rotation structure characterized by, The anti-rotation protrusion and the anti-rotation slot are provided on the shock absorber end cover and the piston respectively.
2. The piston anti-rotation structure of claim 1, wherein The shock absorber end cover is interference-pressed on the top of the shock absorber, and the upper part of the piston is sleeved outside the shock absorber end cover.
3. The piston anti-rotation structure of claim 2, wherein The anti-rotation protrusion is provided on the inner wall of the piston in contact with the shock absorber end cover, and the anti-rotation slot is provided on the outer wall of the shock absorber end cover in contact with the piston.
4. The piston anti-rotation structure of claim 2, wherein The anti-rotation torque is set by the interference amount between the shock absorber end cover and the shock absorber.