Guides and double tube shock absorbers
By setting a smooth transition zone with an axial protrusion at the bottom of the guide, the impact problem between the guide and the buffer block is solved, thereby improving the stability of the piston rod and valve system, extending the valve system life, and improving driving comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 采埃孚汽车系统(张家港)有限公司
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-07
Smart Images
Figure CN224469565U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive parts technology, specifically to guides and twin-tube shock absorbers. Background Technology
[0002] The main components of a twin-tube shock absorber include: an outer tube and an inner tube that are coaxial and spaced apart; a guide mounted on the top of the outer tube and the inner tube; a piston rod that extends into the inner tube through the shaft hole of the guide; and a buffer block fitted on the piston rod for buffering engagement with the bottom of the guide during the piston rod's rebound phase.
[0003] In existing designs, the bottom of the guide is usually a flat surface. During the rebound phase of the piston rod, the buffer block impacts the bottom of the guide. During the impact, the oil between the two is pressed against the piston rod, affecting the stability of the piston rod and causing instability of the damping force. In extreme cases, this may damage the valve system of the twin-tube shock absorber.
[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content
[0005] In view of this, the present invention provides a guide and a twin-tube shock absorber, which can improve the stability of the piston rod and damping force, increase the valve system life, and improve driving comfort.
[0006] According to one aspect of the present invention, a guide is provided for a twin-tube vibration damper. The bottom of the guide is provided with a protrusion that axially protrudes relative to the shaft hole of the guide. The protrusion includes: a first smooth transition region connected to the inner wall of the shaft hole, the inner wall of the shaft hole being used for the piston rod of the twin-tube vibration damper to pass through; a second smooth transition region connected to the outer wall of the shaft hole, the outer wall of the shaft hole being used for assembly with the inner cylinder of the twin-tube vibration damper; and a planar region connected between the first smooth transition region and the second smooth transition region.
[0007] In some embodiments, both the first smooth transition region and the second smooth transition region are formed as curved surfaces.
[0008] In some embodiments, both the first smooth transition region and the second smooth transition region are formed as surfaces of revolution.
[0009] In some embodiments, the first smooth transition region and / or the second smooth transition region are formed as parabolic surfaces.
[0010] In some embodiments, the first smooth transition region has a gradient curvature, wherein the curvature of the portion of the first smooth transition region near the inner wall of the shaft hole is greater than the curvature of the portion of the first smooth transition region near the planar region.
[0011] In some embodiments, the outer wall of the shaft hole is provided with a chamfer at the end edge, and the second smooth transition region includes a beveled portion connected to the chamfer and a curved portion connected between the beveled portion and the planar region.
[0012] In some embodiments, the first smooth transition region and the second smooth transition region are formed as an asymmetric structure.
[0013] In some embodiments, the slope of the first smooth transition zone is less than the slope of the second smooth transition zone.
[0014] In some embodiments, the surface of the first smooth transition region and / or the surface of the second smooth transition region are provided with guide grooves.
[0015] According to another aspect of the present invention, a twin-tube vibration damper is provided, the twin-tube vibration damper being configured with a guide as described in any of the above embodiments.
[0016] The beneficial effects of this utility model compared with the prior art include at least the following:
[0017] This invention adds a special axial protrusion to the bottom of the guide, with a smooth transition between the protrusion and the inner and outer edges of the guide, i.e., between the protrusion and the inner and outer walls of the guide's shaft hole. During the piston rod's rebound phase, when the buffer block fitted on the piston rod impacts the protrusion of the guide, the first smooth transition zone provides a first space formed between the protrusion, the buffer block, and the piston rod, allowing oil to flow into this first space upon impact, thus preventing additional impact on the piston rod and valve system. Similarly, during the piston rod's rebound phase, when the buffer block impacts the protrusion, the second smooth transition zone provides a second space formed between the protrusion, the buffer block, and the inner cylinder, allowing oil to flow into this second space upon impact, thus preventing additional impact on the inner cylinder and valve system. Both the first and second smooth transition zones are formed as seamless, low-stress, and continuous connection areas, avoiding sharp edges, curvature jumps, and other discontinuities, thereby smoothly guiding the oil flow. The planar area connecting the first and second smooth transition zones can prevent stress concentration during press-fitting, which could damage the guide, and ensure that the buffer block can produce an effective and gentle buffer impact with the protrusion during the rebound phase of the piston rod.
[0018] The guide of this utility model can effectively improve the stability of the piston rod and damping force of the twin-tube shock absorber, increase the valve system life of the twin-tube shock absorber, and thus improve the driving comfort.
[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description
[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0021] Figure 1 A schematic diagram of the guide in an embodiment of this utility model is shown. Detailed Implementation
[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.
[0023] The accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar structures, and therefore, repeated descriptions of them will be omitted.
[0024] The use of terms such as "first," "second," and similar words in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. Terms such as "top," "bottom," "axial," and "radial," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, in the description of the present invention, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly; for example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.
[0025] It should be noted that, unless otherwise specified, the embodiments of this utility model and the features in different embodiments can be combined with each other.
[0026] Figure 1 The structure of the guide in the embodiment of this utility model is illustrated. (Refer to...) Figure 1As shown, the guide 100 provided by this utility model is used in a twin-tube vibration damper. The bottom of the guide 100 is provided with a protrusion 120 that protrudes axially relative to the shaft hole 110 of the guide 100. The protrusion 120 may include:
[0027] The first smooth transition zone 121 connects to the inner wall 110a of the shaft hole 110, and the inner wall 110a of the shaft hole 110 is used to pass through the piston rod of the double-cylinder damper.
[0028] The second smooth transition zone 122 connects to the outer wall 110b of the shaft hole 110, which is used to assemble with the inner cylinder of the twin-tube shock absorber.
[0029] Planar region 123 is connected between the first smooth transition region 121 and the second smooth transition region 122.
[0030] This invention adds a special axial protrusion to the bottom of the guide 100. The protrusion 120 smoothly transitions between the inner and outer edges of the guide 100, that is, between the protrusion and the inner wall 110a and outer wall of the shaft hole 110 of the guide 100. The first smooth transition area 121 of the protrusion 120 connects to the inner wall 110a of the shaft hole 110. During the rebound phase of the piston rod, when the buffer block fitted on the piston rod impacts the protrusion 120 of the guide 100, this first smooth transition area 121 provides a first space 121' formed between the protrusion 120, the buffer block, and the piston rod. This allows oil to flow into the first space 121' upon impact, preventing additional impact on the piston rod and valve system. Similarly, the second smooth transition zone 122 of the protrusion 120 connects to the outer wall 110b of the shaft hole 110. During the rebound phase of the piston rod, when the buffer block impacts the protrusion 120, the second smooth transition zone 122 provides a second space 122' formed between the protrusion 120, the buffer block, and the inner cylinder, allowing oil to flow into the second space 122' upon impact, thus avoiding additional impact on the inner cylinder and valve system. Both the first smooth transition zone 121 and the second smooth transition zone 122 are formed as seamless, low-stress, and continuous connection areas, avoiding discontinuities such as sharp edges and curvature jumps, thereby smoothly guiding the oil flow. Furthermore, during assembly, the first smooth transition zone 121 guides the assembly of the guide 100 and the piston rod, and the second smooth transition zone 122 guides the assembly of the guide 100 and the inner cylinder. A plane region 123 connects the first smooth transition zone 121 and the second smooth transition zone 122. This plane region 123 can prevent stress concentration during press-fitting from damaging the guide 100, and ensures that the buffer block can generate an effective and gentle buffer impact with the protrusion 120 during the rebound phase of the piston rod.
[0031] Therefore, the guide 100 of this utility model, through the protrusion 120 including the first smooth transition area 121, the second smooth transition area 122 and the planar area 123 connecting the two, effectively improves the stability of the piston rod and damping force of the twin-tube shock absorber, increases the valve system life of the twin-tube shock absorber, and thus improves the ride comfort.
[0032] In some embodiments, both the first smooth transition region 121 and the second smooth transition region 122 are formed as curved surfaces. Achieving a smooth transition through curved surfaces can disperse the load, avoid stress concentration during impact, and optimize fluid performance and guide the smooth flow of oil.
[0033] In other embodiments, the first smooth transition region 121 and / or the second smooth transition region 122 can also achieve a smooth transition without abrupt changes, with low stress and continuity through chamfering, multi-level steps, etc.
[0034] In some embodiments, both the first smooth transition region 121 and the second smooth transition region 122 are formed as surfaces of revolution. The first smooth transition region 121 connects to the inner wall 110a of the shaft hole 110, and the second smooth transition region 122 connects to the outer wall 110b of the shaft hole 110. The formation of surfaces of revolution for the first smooth transition region 121 and the second smooth transition region 122 facilitates machining, such as by turning, to achieve high-efficiency and low-cost machining, making it suitable for mass production.
[0035] In some embodiments, the first smooth transition region 121 and / or the second smooth transition region 122 are formed as parabolic surfaces. The curvature of the parabolic surface gradually changes from the center to the edge (without abrupt changes), so that the impact stress is smoothly transmitted along the first smooth transition region 121 / second smooth transition region 122, avoiding local stress concentration. Moreover, the parabolic surface conforms to the hydrodynamic characteristics and can smoothly guide the flow of oil.
[0036] In other embodiments, the first smooth transition region 121 and / or the second smooth transition region 122 may also be formed as a suitable rotating surface such as a circular arc surface or an ellipsoidal surface.
[0037] In some embodiments, the first smooth transition region 121 has a gradual curvature, wherein the curvature of the portion 121a of the first smooth transition region 121 near the inner wall 110a of the shaft hole 110 is greater than the curvature of the portion 121b of the first smooth transition region 121 near the planar region 123, so that the portion 121a of the first smooth transition region 121 near the inner wall 110a of the shaft hole 110 is relatively steep, while the portion 121b of the first smooth transition region 121 near the planar region 123 is relatively gentle, in order to adapt to the smooth connection with the inner wall 110a and the planar region 123 of the shaft hole 110, and to enable the smooth guidance of oil to the first space 121'.
[0038] In some embodiments, the outer wall 110b of the shaft hole 110 is provided with a chamfer 111 at its end edge. The second smooth transition region 122 may include a beveled portion 122a connected to the chamfer 111 and a curved portion 122b connected between the beveled portion 122a and the planar region 123. The chamfer 111 facilitates the assembly of the guide 100 with the inner cylinder, and the second smooth transition region 122 achieves a smooth connection between the chamfer 111 and the planar region 123 through the beveled portion 122a and the curved portion 122b.
[0039] In some embodiments, the first smooth transition zone 121 and the second smooth transition zone 122 are formed as asymmetrical structures, with asymmetrical first spaces 121' and second spaces 122' formed on both sides of the planar region 123, to preferentially guide the oil flow to one of the spaces and reduce the impact on the other space. In practical applications, the slope of the first smooth transition zone 121 can be set to be less than the slope of the second smooth transition zone 122, making the second smooth transition zone 122 steeper and the first smooth transition zone 121 gentler, thereby preferentially guiding the oil to the second space 122', reducing the impact on the piston rod, and improving the stability of the piston rod and damping force.
[0040] In some embodiments, the surfaces of the first smooth transition region 121 and / or the second smooth transition region 122 are provided with guide grooves. These guide grooves can guide and constrain the oil flow path, allowing the oil to flow smoothly and reducing impact force.
[0041] This utility model embodiment also provides a twin-tube shock absorber, which is configured with a guide 100 as described in any of the above embodiments. Utilizing the guide 100, through the protrusion 120 including a first smooth transition region 121, a second smooth transition region 122, and a planar region 123 connecting the two, the stability of the piston rod and damping force of the twin-tube shock absorber is effectively improved, the valve system life of the twin-tube shock absorber is increased, and thus the ride comfort is improved.
[0042] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A guide for a twin-tube vibration damper, characterized in that, The bottom of the guide is provided with a protrusion that protrudes axially relative to the shaft hole of the guide, the protrusion comprising: The first smooth transition zone connects to the inner wall of the shaft hole, and the inner wall of the shaft hole is used to pass through the piston rod of the twin-tube shock absorber; The second smooth transition zone connects to the outer wall of the shaft hole, which is used for assembly with the inner cylinder of the twin-tube shock absorber. A planar region connects the first smooth transition region and the second smooth transition region.
2. The guide as described in claim 1, characterized in that, Both the first smooth transition region and the second smooth transition region are formed as curved surfaces.
3. The guide as described in claim 2, characterized in that, Both the first smooth transition region and the second smooth transition region are formed as surfaces of revolution.
4. The guide as described in claim 3, characterized in that, The first smooth transition region and / or the second smooth transition region are formed as parabolic surfaces.
5. The guide as described in claim 2, characterized in that, The first smooth transition region has a gradient curvature, wherein the curvature of the portion of the first smooth transition region near the inner wall of the shaft hole is greater than the curvature of the portion of the first smooth transition region near the planar region.
6. The guide as claimed in claim 1, characterized in that, The outer wall of the shaft hole is provided with a chamfer at the end edge, and the second smooth transition area includes a beveled part connected to the chamfer and a curved part connected between the beveled part and the planar part.
7. The guide as claimed in claim 1, characterized in that, The first smooth transition region and the second smooth transition region are formed as an asymmetric structure.
8. The guide as claimed in claim 7, characterized in that, The slope of the first smooth transition zone is less than that of the second smooth transition zone.
9. The guide as described in any one of claims 1 to 8, characterized in that, The surface of the first smooth transition zone and / or the surface of the second smooth transition zone are provided with flow guide grooves.
10. A twin-tube vibration damper, characterized in that, The twin-tube vibration damper is equipped with a guide as described in any one of claims 1 to 9.