External corrugated pipe and shock absorber

Abstract

The utility model discloses an external corrugated pipe and a shock absorber, and relates to the technical field of hydraulic elements, and an external corrugated pipe body comprises a telescopic section which is folded into a corrugated shape along the axial direction of the external corrugated pipe; the first fixing section is connected with one end of the telescopic section, the first fixing section is folded into a corrugated shape in the axial direction of the external corrugated pipe, the first fixing section is used for being arranged on the outer wall of the oil storage cylinder in a sleeving mode, and the inner diameter of the first fixing section is smaller than the outer diameter of the oil storage cylinder so that the first fixing section can be in interference fit with the oil storage cylinder; the second fixing section is connected with the other end of the telescopic section, and the second fixing section is used for being arranged on the outer wall of the dustproof cover in a sleeving mode. Compared with a fixing mode of fastening through a hose clamp, the first fixing section and the oil storage cylinder of the shock absorber are mutually fastened and connected in an interference mode, disassembly and assembly are convenient, daily inspection and regular inspection of the oil shock absorber are facilitated, accumulated water permeating into the oil shock absorber is drained in time, and the service life of the oil shock absorber is prolonged. And the problems that paint in the shock absorber falls off and is rusted due to long-time water accumulation are relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic components, in particular to an external bellows and a shock absorber. Background Art

[0002] Hydraulic shock absorbers are key components on rail vehicles. Their performance and the condition of their parts directly impact ride comfort and safety. Existing dust-proof structures on shock absorbers include a dust ring or a dust-proof skeleton oil seal on the guide cover unit, and an external bellows mounted on the shock absorber sleeve. The bellows are secured to the shock absorber with hose clamps at both ends. However, this fixing structure is difficult to disassemble and hinders routine inspections and regular checks of the shock absorber within the external bellows. Furthermore, due to the tightness of the hose clamps, water that accidentally seeps into the bellows during spring and autumn cannot be drained out in a timely manner, causing paint peeling and rust on the shock absorber's interior.

[0003] Therefore, how to facilitate the disassembly and assembly of the external bellows and the oil shock absorber to facilitate daily inspection of the oil shock absorber and discharge of water accumulated in the inner cavity is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0004] The purpose of the present invention is to provide an external bellows and a shock absorber. The external bellows provided by the present invention is used to facilitate the disassembly and assembly of the external bellows and the oil pressure shock absorber, so as to facilitate daily inspection of the oil pressure shock absorber and discharge of water accumulated in the inner cavity.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] An external bellows is installed on a shock absorber, the external bellows comprising an external bellows body, the external bellows body being provided with a through center hole for passing through an oil storage cylinder of the shock absorber and a dust cover axially movably connected to the oil storage cylinder, the external bellows body comprising:

[0007] a telescopic section, the telescopic section being folded into a corrugated shape along the axial direction of the external bellows;

[0008] a first fixed section connected to one end of the telescopic section, the first fixed section being folded into a corrugated shape along the axial direction of the external bellows, the first fixed section being sleeved on the outer wall of the oil storage cylinder, and the first fixed section and the oil storage cylinder being in an interference fit;

[0009] The second fixed section is connected to the other end of the telescopic section, and the second fixed section is used to be sleeved on the outer wall of the dust cover.

[0010] Optionally, in the above-mentioned external bellows, the first fixed section also includes a folding portion, which is connected to one end of the first fixed section away from the telescopic section, and the diameter of the folding portion gradually increases in the direction away from the telescopic section, so that the folding portion is in non-fitting contact with the outer wall of the oil storage cylinder.

[0011] Optionally, in the above-mentioned external bellows, a plurality of grooves are formed on the end surface of the folded portion away from the first fixed section, and the grooves are evenly spaced and distributed on the same circumference with the axis of the folded portion as the center.

[0012] Optionally, in the above-mentioned external corrugated tube, a plurality of reinforcing ribs are provided on the outer wall of the first fixed section, and the reinforcing ribs are evenly spaced in the first fixed section, and the reinforcing ribs extend from one end where the first fixed section is connected to the telescopic section to the end of the folding portion away from the first fixed section.

[0013] Optionally, in the above-mentioned external corrugated tube, the number of the grooves and the number of the reinforcing ribs are the same, and one groove corresponds to one reinforcing rib.

[0014] Optionally, in the above-mentioned external bellows, the second fixing section is folded into a corrugated shape along the axial direction of the external bellows, and the second fixing section and the dust cover are interference fit.

[0015] Optionally, in the above-mentioned external bellows, the outer wall of the telescopic section is configured to be a smooth streamlined shape.

[0016] Optionally, in the above-mentioned external bellows, the external bellows body is an integrated structure, and / or the material of the external bellows body is EPDM rubber.

[0017] Compared with the prior art, in the external bellows provided by the present invention, the external bellows body is inserted into the shock absorber through the center hole, wherein the first fixed section of the external bellows body is located at one end of the oil storage cylinder of the shock absorber, and the inner diameter of the first fixed section is smaller than the outer diameter of the oil storage cylinder. The first fixed section and the oil storage cylinder are interference fit so that the first fixed section is tightly sleeved on the oil storage cylinder, and the second fixed section of the external bellows body is sleeved and fixed on the outside of the dust cover. Compared with the fixing method of fastening by a throat clamp in the prior art, the first fixing section of the external bellows body and the oil storage cylinder of the shock absorber are fastened to each other by an interference fit method. During the daily inspection and regular inspection of the oil pressure shock absorber, an upward force is applied to the external bellows body to separate the first fixing section of the external bellows body from the oil storage cylinder of the shock absorber, so as to facilitate the inspection of the staff. Moreover, by disengaging the first fixing section of the external bellows body from the oil storage cylinder, the accumulated water that has seeped into the oil pressure shock absorber can be discharged, thereby alleviating the problem of paint peeling and rusting inside the shock absorber caused by long-term water accumulation. Therefore, the external bellows provided by the utility model is more convenient to disassemble and assemble as a whole, which facilitates the daily inspection of the oil pressure shock absorber and the discharge of accumulated water in the inner cavity.

[0018] The present invention also provides a shock absorber, including an oil storage cylinder and a dust cover, the dust cover is movably sleeved on one end of the oil storage cylinder along the axial direction of the oil storage cylinder, and includes an external bellows as described in any of the above items, the first fixed section of the external bellows is sleeved on the outer wall of the oil storage cylinder, and the second fixed section is sleeved on the outer wall of the dust cover.

[0019] The shock absorber provided by the present invention has all the technical effects of the external bellows as it has the external bellows, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the external bellows disclosed in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the groove in the folding portion disclosed in an embodiment of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of the shock absorber disclosed in an embodiment of the present utility model.

[0024] Reference numerals:

[0025] 100 is the external bellows body, 110 is the first fixed section, 111 is the folded portion, 112 is the groove, 120 is the telescopic section, 130 is the second fixed section, 140 is the reinforcing rib, and 150 is the throat clamp slot;

[0026] 10 is a shock absorber, 11 is an oil storage cylinder, and 12 is a dust cover. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0030] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] The core of the utility model is to provide an external bellows, which is used to facilitate the disassembly and assembly of the external bellows and the oil pressure shock absorber, so as to facilitate the daily inspection of the oil pressure shock absorber and the discharge of water accumulated in the inner cavity;

[0033] Another core of the present invention is to provide a shock absorber having the above-mentioned external bellows.

[0034] like Figure 1 As shown, an embodiment of the present invention discloses an external bellows installed on a shock absorber 10, the external bellows including an external bellows body 100, the external bellows body 100 is provided with a through center hole, the center hole is used to pass through the oil storage cylinder 11 of the shock absorber 10 and the dust cover 12 axially movably connected to the oil storage cylinder 11, the external bellows body 100 includes a telescopic section 120, a first fixed section 110 and a second fixed section 130. Among them, the first fixed section 110 and the second fixed section 130 are respectively connected to the two ends of the telescopic section 120, and the telescopic section 120 is provided with a corrugated structure folded along the extension direction of the external bellows body 100, so that during the stretching or contraction process of the oil pressure shock absorber 10, the telescopic section 120 can adapt to the stretching, extension or contraction and folding of the oil pressure shock absorber 10, and the inner cavity diameter of the first fixed section 110 is smaller than the outer diameter of the oil storage cylinder 11. Then, when the first fixed section 110 is sleeved on the outer wall of the oil storage cylinder 11, the first fixed section 110 and the oil storage cylinder 11 are interference fit, thereby realizing the fastening of the first fixed section 110 and the oil storage cylinder 11 The connection makes the installation process of the first fixing section 110 and the oil storage cylinder 11 easy and clean, and by applying a thrust to the first fixing section 110 in the direction of the dust cover 12, the first fixing section 110 is pushed away from the oil storage cylinder 11 and separated from the oil storage cylinder 11, thereby facilitating the inspection by maintenance personnel. At the same time, the first fixing section 110 is separated from the oil storage cylinder 11, and the accumulated water that has seeped into the inner cavity of the external bellows can be discharged, so as to alleviate the problem of paint peeling and rusting inside the shock absorber 10 caused by long-term water accumulation. When the external bellows body 100 is inserted into the shock absorber 10, the second fixing section 130 is fixed on the outer wall of the dust cover 12.

[0035] In a specific embodiment, the first fixed section 110 further includes a folding portion 111, which is connected to the end of the first fixed section 110 away from the telescopic section 120. The folding portion 111 extends in a direction away from the telescopic section 120, and the diameter of the folding portion 111 gradually increases, so that the inner diameter of the folding portion 111 is larger than the outer diameter of the oil storage cylinder 11. At the same time, the folding portion 111 gradually extends away from the oil storage cylinder 11, so that the folding portion 111 is not in close contact with the outer wall of the oil storage cylinder 11. Therefore, when maintenance personnel need to inspect the interior, they can use auxiliary tools such as pliers or directly clamp the folding portion 111 by hand, and pull the folding portion 111 to fold the first fixed section 110 from the inside out, thereby opening the tightly fitting portion between the first fixed section 110 and the oil storage cylinder 11, observing the interior, and draining any accumulated water. After the inspection is completed or the accumulated water is drained, the first fixing section 110 can be put back onto the outer wall of the oil storage cylinder 11 by pulling the folding portion 111, which further improves the convenience of use.

[0036] like Figure 2 As shown, a plurality of grooves 112 are further provided on the end surface of the folded portion 111 away from the first fixed section 110. The grooves 112 are evenly spaced and distributed on the same circumference with the axis of the folded portion 111 as the center. Therefore, when the first fixed section 110 and the folded portion 111 are inserted into the oil storage cylinder 11, the grooves 112 provide an expansion gap, which facilitates the smooth insertion of the external bellows body 100 into the oil storage cylinder 11, thereby improving the speed and efficiency of the installation work.

[0037] In addition, a plurality of reinforcing ribs 140 are provided on the outer wall of the first fixed section 110, and the respective reinforcing ribs 140 are evenly spaced on the first fixed section 110, and the reinforcing ribs 140 extend from one end where the first fixed section 110 is connected to the telescopic section 120 to the end of the folding portion 111 away from the first fixed section 110. The structural strength of the first fixed section 110 is improved by the plurality of reinforcing ribs 140, so that the first fixed section 110 and the oil storage cylinder 11 are interference fit. In the process of the first fixed section 110 being inserted into the oil storage cylinder 11, the problem of the first fixed section 110 being broken is reduced, and the plurality of reinforcing ribs 140 help to improve the fastening ability of the first fixed section 110 in the oil storage cylinder 11.

[0038] Furthermore, the number of grooves 112 on the end face of the folding portion 111 is the same as the number of reinforcing ribs 140 provided on the outer wall of the first fixed section 110, and one groove 112 corresponds to one reinforcing rib 140, that is, the groove 112 extends in the direction of the reinforcing rib 140, so that during the nesting process of the first fixed section 110 and the oil storage cylinder 11, the reinforcing rib 140 reduces the occurrence of cracks at the extension of the groove 112 toward the first fixed section 110, thereby improving the overall structural strength and service life of the external bellows body 100.

[0039] In another specific embodiment, the second fixed section 130 of the external bellows body 100 mounted on the dust cover 12 is also folded into a corrugated shape along the axial direction of the external bellows. The inner diameter of the second fixed section 130 is smaller than the outer diameter of the dust cover 12. The second fixed section 130 and the dust cover 12 are also interference fit, thereby achieving the installation and fixation of the second fixed section 130 and the dust cover 12, and similarly improving the convenience of installation of the second fixed section 130 and the dust cover 12.

[0040] Alternatively, a throat clamp groove 150 is opened on the outer wall of the second fixing section 130. After the second fixing section 130 is put on the dust cover 12, the throat clamp is inserted into the throat clamp groove 150 and tightened, so that the second fixing section 130 and the dust cover 12 are installed and fixed to each other through the throat clamp.

[0041] At the same time, during the travel of the rail vehicle, taking into account the high wind resistance experienced by the transversely installed oil pressure shock absorber 10, the outer wall of the telescopic section 120 in the external bellows body 100 is set to a smooth streamlined shape, so that the air fluid flows quickly on the streamlined surface, reducing the air resistance experienced by the windward surface of the oil pressure shock absorber 10, thereby reducing the fluctuation of the external bellows body 100 caused by the airflow, and improving the stress conditions of the external bellows body 100 during the reciprocating motion, thereby greatly improving the service life of the external bellows.

[0042] The external bellows body 100 provided in this embodiment is an injection-molded integral structure, which improves the overall structural strength. The material of the external bellows body 100 is EPDM rubber, which has its own lubricating effect. When the second tube portion of the external bellows body 100 slides on the oil storage cylinder 11, the self-lubricating EPDM rubber can maintain the lubrication effect quickly, continuously, long-term and evenly even when the lubricant is continuously consumed, so as to ensure that the low friction effect is continuously maintained during the dynamic process, avoid dry friction, and avoid excessive friction between the external bellows body 100 and the oil storage cylinder 11, thereby causing friction damage to the oil storage cylinder 11 and damaging the paint on the outside of the oil storage cylinder 11; at the same time, the lubricant continuously released by the self-lubricating EPDM rubber can also enhance gas exchange at the free end. Moreover, the windward surface of EPDM rubber, which can continuously release lubricant, is relatively smooth. The smooth windward surface reduces the friction resistance caused by shear stress, further reduces air resistance, and can better resist the impact of wind and sand to reduce the breakage rate.

[0043] The present invention also discloses a shock absorber 10 comprising an oil reservoir 11, a dust cover 12, and the aforementioned external bellows. The dust cover 12 is movably mounted on one end of the oil reservoir 11 along the axial direction of the oil reservoir 11. The first fixed section 110 of the external bellows is mounted on the outer wall of the oil reservoir 11, and the second fixed section 130 is mounted on the outer wall of the dust cover 12. Since the shock absorber 10 includes the aforementioned external bellows, it possesses all the technical effects of the aforementioned external bellows, which will not be further described herein.

[0044] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An external bellows, characterized in that: Installed on the shock absorber, the external bellows includes an external bellows body, the external bellows body is provided with a through center hole, the center hole is used to pass through the oil storage cylinder of the shock absorber and the dust cover axially movably connected to the oil storage cylinder, the external bellows body includes: a telescopic section, the telescopic section being folded into a corrugated shape along the axial direction of the external bellows; a first fixed section connected to one end of the telescopic section, the first fixed section being folded into a corrugated shape along the axial direction of the external bellows, the first fixed section being adapted to be sleeved on the outer wall of the oil storage cylinder, and the inner diameter of the first fixed section being smaller than the outer diameter of the oil storage cylinder, so that the first fixed section and the oil storage cylinder form an interference fit; The second fixed section is connected to the other end of the telescopic section, and the second fixed section is used to be sleeved on the outer wall of the dust cover.

2. The external bellows according to claim 1, characterized in that: The first fixed section also includes a folding portion, which is connected to one end of the first fixed section away from the telescopic section, and the diameter of the folding portion gradually increases in the direction away from the telescopic section, so that the folding portion is in non-fitting contact with the outer wall of the oil storage cylinder.

3. The external bellows according to claim 2, characterized in that: A plurality of grooves are formed on the end surface of the folding portion away from the first fixing section, and the grooves are evenly spaced and distributed on the same circumference with the axis of the folding portion as the center.

4. The external bellows according to claim 3, characterized in that: The outer wall of the first fixed section is provided with a plurality of reinforcing ribs, each of the reinforcing ribs is evenly spaced in the first fixed section, and the reinforcing ribs extend from one end of the first fixed section connected to the telescopic section to the end of the folding portion away from the first fixed section.

5. The external bellows according to claim 4, characterized in that: The number of the grooves and the number of the reinforcing ribs are the same, and one groove corresponds to one reinforcing rib.

6. The external bellows according to claim 1, characterized in that: The second fixing section is folded into a corrugated shape along the axial direction of the external bellows, and the second fixing section and the dust cover are interference fit.

7. The external bellows according to claim 1, characterized in that: The outer wall of the telescopic section is configured to be a smooth streamlined shape.

8. The external bellows according to claim 1, characterized in that: The external bellows body is an integrated structure, and / or the material of the external bellows body is EPDM rubber.

9. A shock absorber, comprising an oil storage cylinder and a dust cover, wherein the dust cover is movably sleeved on one end of the oil storage cylinder along the axial direction of the oil storage cylinder, characterized in that: It comprises the external bellows according to any one of claims 1 to 8, wherein the first fixed section of the external bellows is sleeved on the outer wall of the oil storage cylinder, and the second fixed section is sleeved on the outer wall of the dust cover.

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