Guider assembly and double-cylinder shock absorber

Abstract

The utility model relates to the technical field of shock absorbers, and provides a guider assembly and a double-cylinder shock absorber. The guider assembly comprises an angle ring assembled outside a guider body, a first groove cavity is formed between the angle ring and the outer wall of the guider body, and the first groove cavity is communicated with an oil storage cavity of the double-cylinder shock absorber. The second groove cavity is formed in the guider body, and the second groove cavity is communicated with an upper working cavity of the double-cylinder shock absorber; the first groove cavity is communicated with the second groove cavity to form a U-shaped communicating cavity, and oil which is used for separating the oil storage cavity from the upper working cavity and flows along with the pressure difference between the oil storage cavity and the upper working cavity is stored in the communicating cavity. When pressure difference exists between the oil storage cavity and the upper working cavity, oil in the communication cavity flows to change the volumes of the oil storage cavity and the upper working cavity, and the pressure difference between the oil storage cavity and the upper working cavity is reduced, so that gas in the oil storage cavity is reduced or even prevented from entering the upper working cavity, and the foaming problem of the upper working cavity is effectively solved; and meanwhile, noise generated by vibration of gas and matched parts can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, specifically to a guide assembly and a twin-tube shock absorber. Background Technique

[0002] A twin-tube shock absorber includes an outer tube and an inner tube which are coaxially and spacedly arranged, a guide assembly assembled at the top ends of the outer tube and the inner tube, a piston rod passing through the guide assembly and extending into the inner tube, an oil seal cooperating with the guide assembly and the piston rod, and other components. Among them, an oil storage cavity of the twin-tube shock absorber is formed between the outer tube and the inner tube, a working cavity of the twin-tube shock absorber is formed in the inner cavity of the inner tube, and the working cavity is divided into an upper working cavity and a lower working cavity by the end of the piston rod.

[0003] The working principle of the twin-tube shock absorber is as follows: when the piston rod moves downward for compression, the volume of the upper working cavity increases and the volume of the lower working cavity decreases. At this time, the oil needs to flow from the lower working cavity to the upper working cavity and from the lower working cavity to the oil storage cavity through a series of valve components arranged in the twin-tube shock absorber; when the piston rod moves upward for stretching, the volume of the upper working cavity decreases and the volume of the lower working cavity increases. At this time, the oil needs to flow from the upper working cavity to the lower working cavity and from the oil storage cavity to the lower working cavity through a series of valve components arranged in the twin-tube shock absorber.

[0004] In the actual application of the current twin-tube shock absorber, it is found that the upper working cavity is prone to foaming problems. Specifically, during the downward compression process of the piston rod, due to the increase in the volume of the upper working cavity and the generation of a certain degree of vacuum, the gas in the oil storage cavity enters the upper working cavity through the gap between the guide and the oil seal, etc., and is mixed into the oil in the upper working cavity, resulting in foaming.

[0005] Currently, the main way to solve the foaming problem of the upper working cavity of the twin-tube shock absorber is to add a check lip to the oil seal, so that the check lip closely adheres to the guide to prevent the gas in the oil storage cavity from entering the upper working cavity during the compression stroke. However, the check ability of the check lip will weaken with aging during use, and thus the foaming problem of the upper working cavity cannot be solved, and a huge noise will be generated when the gas passes through the check lip.

[0006] It should be noted that the information disclosed in the above background technical part is only used to strengthen the understanding of the background of the present utility model, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0007] In view of this, the present utility model provides a guide assembly and a twin-tube shock absorber. By providing a communication cavity in the guide assembly that connects the oil storage cavity and the upper working cavity of the twin-tube shock absorber, when there is a pressure difference between the oil storage cavity and the upper working cavity, the oil in the communication cavity flows to change the volumes of the oil storage cavity and the upper working cavity, thereby reducing the pressure difference between the oil storage cavity and the upper working cavity, greatly reducing or even avoiding the gas in the oil storage cavity from entering the upper working cavity during the compression stroke of the twin-tube shock absorber, effectively solving the problem of foaming in the upper working cavity, and at the same time avoiding the noise generated by the vibration of the gas and the mating components.

[0008] According to one aspect of the present utility model, there is provided a guide assembly for a twin-tube shock absorber, comprising: a corner ring assembled outside the guide body, a first cavity being formed between the corner ring and the outer wall of the guide body, the first cavity communicating with the oil storage cavity of the twin-tube shock absorber; a second cavity opened in the guide body, the second cavity communicating with the upper working cavity of the twin-tube shock absorber; the first cavity and the second cavity being connected to form a U-shaped communication cavity, and the communication cavity storing oil for separating the oil storage cavity and the upper working cavity and flowing with the pressure difference between the oil storage cavity and the upper working cavity.

[0009] In some embodiments, the height of the second cavity along the axial direction is greater than the height of the first cavity along the axial direction.

[0010] In some embodiments, the second cavity is inclinedly opened in the guide body.

[0011] In some embodiments, the second cavities are evenly distributed at intervals in the circumferential direction in the guide body.

[0012] In some embodiments, the number of the second cavities is between 3 and 6, and / or the diameter of the communication cavity is between 3 mm and 8 mm.

[0013] In some embodiments, the corner ring includes a vertically connected vertical wall and a horizontal wall, the horizontal wall being bent inward relative to the vertical wall; the guide body has a stepped outer wall, the horizontal wall being press-fitted with the stepped outer wall with an interference fit, and the vertical wall being spaced from the stepped outer wall to form the first cavity.

[0014] In some embodiments, the wall thickness of the corner ring is between 1 mm and 2 mm.

[0015] According to another aspect of the present utility model, a double-tube shock absorber is provided. The double-tube shock absorber is configured with a guide assembly as described in any of the above embodiments. The guide assembly is provided with a communication cavity including a first cavity and a second cavity that are connected and communicated. The first cavity communicates with the oil storage cavity of the double-tube shock absorber, and the second cavity communicates with the upper working cavity of the double-tube shock absorber. When the double-tube shock absorber is in the compression stroke, the air pressure in the oil storage cavity is greater than the air pressure in the upper working cavity, and the oil in the communication cavity flows into the second cavity. When the double-tube shock absorber is in the tensile stroke, the air pressure in the upper working cavity is greater than the air pressure in the oil storage cavity, and the oil in the communication cavity flows into the first cavity.

[0016] The beneficial effects of the present utility model compared with the prior art at least include:

[0017] In the present utility model, a first cavity is formed by an angle ring assembled outside the guide body, and the second cavity is formed by opening in the guide body, so as to form a U-shaped communication cavity connecting the oil storage cavity and the upper working cavity of the double-tube shock absorber. The communication cavity stores oil for separating the oil storage cavity and the upper working cavity and flowing with the pressure difference between the oil storage cavity and the upper working cavity. During the working process of the double-tube shock absorber, when there is a pressure difference between the oil storage cavity and the upper working cavity, the oil in the communication cavity flows to change the volumes of the oil storage cavity and the upper working cavity, thereby reducing the pressure difference between the oil storage cavity and the upper working cavity.

[0018] Specifically, during the tensile stroke of the double-tube shock absorber, the volume of the upper working cavity decreases and the air pressure increases. At this time, the air pressure in the upper working cavity is greater than the air pressure in the oil storage cavity, so the oil in the communication cavity flows into the first cavity to increase the volume of the upper working cavity and decrease the volume of the oil storage cavity, thereby balancing the pressure difference between the oil storage cavity and the upper working cavity. During the compression stroke of the double-tube shock absorber, the volume of the upper working cavity increases and the air pressure decreases. At this time, the air pressure in the oil storage cavity is greater than the air pressure in the upper working cavity, so the oil in the communication cavity flows into the second cavity to increase the volume of the oil storage cavity and decrease the volume of the upper working cavity, thereby balancing the pressure difference between the oil storage cavity and the upper working cavity.

[0019] In this way, the volumes of the oil storage cavity and the upper working cavity are changed by the change of the oil column in the U-shaped communication cavity to balance the pressure difference between the oil storage cavity and the upper working cavity. In some working conditions with small amplitudes, the pressure difference between the oil storage cavity and the upper working cavity can be completely balanced by the change of the oil column in the U-shaped communication cavity, so as to completely avoid the gas in the oil storage cavity entering the upper working cavity during the compression stroke of the double-tube shock absorber. When the pressure difference between the oil storage cavity and the upper working cavity is large, with the help of the communication cavity, the gas entering the upper working cavity from the oil storage cavity during the compression stroke of the double-tube shock absorber can also be greatly reduced, and the oil returns to the communication cavity during the next tensile stroke, realizing the separation of the oil storage cavity and the upper working cavity.

[0020] Therefore, by adopting the guide assembly of the present utility model, it is possible to greatly reduce or even avoid the gas in the oil storage chamber from entering the upper working chamber during the compression stroke of the double-tube shock absorber, effectively solve the foaming problem of the upper working chamber, improve the working performance of the double-tube shock absorber, and at the same time avoid the noise generated by the vibration of the gas and the mating components, thus enhancing the ride comfort and safety.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and cannot limit the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated into and constitute a part of the specification, showing embodiments consistent with the present utility model, and are used together with the specification to explain the principles of the present utility model. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0023] Figure 1 The structure diagram of the guide assembly in the embodiment of the present utility model is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present utility model will be more complete and comprehensive, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0025] The accompanying drawings are only schematic illustrations of the present utility model and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar structures, and thus repeated descriptions thereof will be omitted.

[0026] The terms "first", "second" and similar terms used in the specific description do not denote any order, quantity or importance, but are only used to distinguish different components. The orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to the present utility model. The meaning of the term "plurality" is two or more unless specifically defined otherwise. In addition, in the description of the present utility model, when it is said that a device is "connected" to another device, this includes not only the case of direct connection, but also the case of indirect connection through other elements.

[0027] It should be noted that, without conflict, the embodiments of the present utility model and the features in different embodiments can be combined with each other.

[0028] Figure 1 Schematically showing the structure of the guide assembly in the embodiment of the present utility model, referring to Figure 1 As shown, the guide assembly for a double-tube shock absorber provided in the embodiment of the present utility model includes:

[0029] An angle ring 20 assembled outside the guide body 10, a first cavity 200 is formed between the outer wall of the angle ring 20 and the guide body 10, and the first cavity 200 communicates with the oil storage cavity of the double-tube shock absorber;

[0030] A second cavity 300 opened in the guide body 10, and the second cavity 300 communicates with the upper working cavity of the double-tube shock absorber;

[0031] The first cavity 200 is connected to the second cavity 300 to form a U-shaped communication cavity, and the communication cavity stores oil that is used to separate the oil storage cavity and the upper working cavity and flows with the pressure difference between the oil storage cavity and the upper working cavity.

[0032] In the present utility model, the angle ring 20 assembled outside the guide body 10 encloses the first cavity 200, and cooperates with the second cavity 300 opened in the guide body 10 to form a U-shaped communication cavity that communicates the oil storage cavity and the upper working cavity of the double-tube shock absorber. The communication cavity stores oil that is used to separate the oil storage cavity and the upper working cavity and flows with the pressure difference between the oil storage cavity and the upper working cavity. During the working process of the double-tube shock absorber, when there is a pressure difference between the oil storage cavity and the upper working cavity, the oil in the communication cavity flows to change the volumes of the oil storage cavity and the upper working cavity, thereby reducing the pressure difference between the oil storage cavity and the upper working cavity.

[0033] Specifically, during the stretching stroke of the double-tube shock absorber, the volume of the upper working cavity decreases and the air pressure increases. At this time, the air pressure in the upper working cavity is greater than the air pressure in the oil storage cavity, so the oil in the communication cavity flows to the first cavity 200 to increase the volume of the upper working cavity and decrease the volume of the oil storage cavity, thereby balancing the pressure difference between the oil storage cavity and the upper working cavity. During the compression stroke of the double-tube shock absorber, the volume of the upper working cavity increases and the air pressure decreases. At this time, the air pressure in the oil storage cavity is greater than the air pressure in the upper working cavity, so the oil in the communication cavity flows to the second cavity 300 to increase the volume of the oil storage cavity and decrease the volume of the upper working cavity, thereby balancing the pressure difference between the oil storage cavity and the upper working cavity.

[0034] In this way, by changing the oil column in the U-shaped connecting cavity, the volumes of the oil storage cavity and the upper working cavity are changed to balance the pressure difference between the oil storage cavity and the upper working cavity. Under some working conditions with small amplitudes, by changing the oil column in the U-shaped connecting cavity, the pressure difference between the oil storage cavity and the upper working cavity can be completely balanced, thus completely avoiding the gas in the oil storage cavity from entering the upper working cavity during the compression stroke of the double-tube shock absorber; when the pressure difference between the oil storage cavity and the upper working cavity is large, with the help of the connecting cavity, the gas entering the upper working cavity from the oil storage cavity during the compression stroke of the double-tube shock absorber can also be greatly reduced, and the oil returns to the connecting cavity during the next stretching stroke, realizing the separation of the oil storage cavity and the upper working cavity.

[0035] Therefore, by adopting the guide assembly of the present utility model, the gas in the oil storage cavity of the double-tube shock absorber can be greatly reduced or even avoided from entering the upper working cavity during the compression stroke, effectively solving the problem of foaming in the upper working cavity, improving the working performance of the double-tube shock absorber, and at the same time, the noise generated by the vibration of the gas and the mating parts can also be avoided, enhancing the ride comfort and safety.

[0036] In some embodiments, the height of the second groove cavity 300 along the axial direction "Z" is greater than the height of the first groove cavity 200 along the axial direction "Z". In this way, the branch path (i.e., the second groove cavity 300) connecting the U-shaped connecting cavity to the upper working cavity is higher than the branch path (i.e., the first groove cavity 200) connecting the U-shaped connecting cavity to the oil storage cavity, so that the gas in the oil storage cavity is more difficult to flow to the upper working cavity through the connecting cavity, further reducing and avoiding the gas from entering the upper working cavity from the oil storage cavity during the compression stroke of the double-tube shock absorber.

[0037] The specific height difference between the second groove cavity 300 and the first groove cavity 200 can be designed according to factors such as the model of the double-tube shock absorber, the vehicle model equipped with the double-tube shock absorber, and the main working conditions adapted by the double-tube shock absorber.

[0038] In some embodiments, the second groove cavity 300 is inclinedly arranged in the guide body 10. In this way, the length of the second groove cavity 300 is further increased, making it difficult for the oil in the connecting cavity to be pushed to the upper working cavity during the compression stroke of the double-tube shock absorber, so that the gas will not flow from the oil storage cavity to the upper working cavity through the connecting cavity.

[0039] The specific inclination angle of the second groove cavity 300 can be designed according to factors such as the model of the double-tube shock absorber, the vehicle model equipped with the double-tube shock absorber, and the main working conditions adapted by the double-tube shock absorber.

[0040] In some embodiments, the second groove cavities 300 are evenly distributed at intervals in the circumferential direction in the guide body 10. In this way, the pressure difference between the oil storage cavity and the upper working cavity is evenly and stably balanced through the U-shaped connecting cavity in the circumferential direction.

[0041] In some embodiments, the number of the second cavities 300 is between 3 and 6, and / or the diameter of the communication cavity is between 3 mm and 8 mm. Through the design of parameters such as the number of the second cavities 300 and the diameter of the communication cavity, the communication cavity effectively plays a role in balancing the pressure difference between the oil storage cavity and the upper working cavity.

[0042] Of course, the number of the second cavities 300 is not limited to 3 to 6, and the diameter of the communication cavity is not limited to 3 mm to 8 mm, but can be designed according to application requirements in combination with factors such as the model of the twin-tube shock absorber, the vehicle model equipped with the twin-tube shock absorber, and the working conditions mainly adapted by the twin-tube shock absorber.

[0043] In some embodiments, the corner ring 20 includes a vertically connected vertical wall 22 and a horizontal wall 24, and the horizontal wall 24 is bent inward relative to the vertical wall 22; the guide body 10 has a stepped outer wall, and the horizontal wall 24 is press-fitted with the stepped outer wall with an interference fit, and the vertical wall 22 is spaced from the stepped outer wall to form a first cavity 200.

[0044] Furthermore, the outer diameter of the corner ring 20 is about 2 mm - 4 mm smaller than the outer diameter of the guide body 10, so as to ensure that the first cavity 200 communicates with the oil storage cavity.

[0045] In some embodiments, the wall thickness of the corner ring 20 is between 1 mm and 2 mm, so as to ensure the stability of the corner ring 20 and enable the corner ring 20 to be stably assembled on the guide body 10.

[0046] The embodiment of the present invention also provides a twin-tube shock absorber, which is configured with the guide assembly described in any of the above embodiments, wherein:

[0047] When the twin-tube shock absorber is in the compression stroke, the air pressure in the oil storage cavity is greater than the air pressure in the upper working cavity, and the oil in the communication cavity flows into the second cavity 300;

[0048] When the twin-tube shock absorber is in the tensile stroke, the air pressure in the upper working cavity is greater than the air pressure in the oil storage cavity, and the oil in the communication cavity flows into the first cavity 200.

[0049] In this way, through the change of the oil column in the U-shaped communication cavity, the volumes of the oil storage cavity and the upper working cavity are changed to balance the pressure difference between the oil storage cavity and the upper working cavity. By adopting the above-mentioned guide assembly, it is possible to greatly reduce or even avoid the gas in the oil storage cavity of the twin-tube shock absorber from entering the upper working cavity during the compression stroke, effectively solve the problem of foaming in the upper working cavity, improve the working performance of the twin-tube shock absorber, and at the same time avoid the noise generated by the vibration of the gas and the mating components, and improve the comfort and safety of driving.

[0050] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A guide assembly for a twin-tube shock absorber, characterized in that: include: An angle ring assembled outside the guide body, wherein a first groove cavity is formed between the angle ring and the outer wall of the guide body, and the first groove cavity is connected to the oil storage cavity of the double-tube shock absorber; A second groove cavity is provided in the guide body, wherein the second groove cavity is connected to the upper working cavity of the double-tube shock absorber; The first groove cavity is connected with the second groove cavity to form a U-shaped connecting cavity, and the connecting cavity stores oil used to separate the oil storage cavity and the upper working cavity and flows with the pressure difference between the oil storage cavity and the upper working cavity.

2. The guide assembly according to claim 1, characterized in that: A height of the second slot cavity along the axial direction is greater than a height of the first slot cavity along the axial direction.

3. The guide assembly according to claim 2, characterized in that: The second groove cavity is obliquely opened in the guide body.

4. The guide assembly according to claim 1, characterized in that: The second groove cavities are evenly distributed in the guide body at intervals in the circumferential direction.

5. The guide assembly according to claim 4, characterized in that: The number of the second groove cavities is between 3 and 6, and / or the diameter of the connecting cavity is between 3 mm and 8 mm.

6. The guide assembly according to claim 1, characterized in that: The corner ring comprises a vertical wall and a horizontal wall connected in one piece, wherein the horizontal wall is bent inwardly relative to the vertical wall; The guide body has a stepped outer wall, the horizontal wall is press-fitted with the stepped outer wall by interference, and the vertical wall is spaced apart from the stepped outer wall to form the first groove cavity.

7. The guide assembly according to claim 1, characterized in that: The wall thickness of the corner ring is between 1 mm and 2 mm.

8. A double-tube shock absorber, characterized in that: A guide assembly as claimed in any one of claims 1 to 7 is provided, wherein the guide assembly is provided with a connecting cavity including a first groove cavity and a second groove cavity which are connected to each other, wherein the first groove cavity is connected to the oil storage cavity of the twin-tube shock absorber, and the second groove cavity is connected to the upper working cavity of the twin-tube shock absorber; When the twin-tube shock absorber is in a compression stroke, the air pressure in the oil storage chamber is greater than the air pressure in the upper working chamber, and the oil in the connecting chamber flows toward the second groove chamber; When the twin-tube shock absorber is in the extension stroke, the air pressure in the upper working chamber is greater than the air pressure in the oil storage chamber, and the oil in the connecting chamber flows toward the first groove chamber.

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