Novel oil damper
By adopting an internal cavity separation and atmospheric cylinder structure in the shock absorber, the problems of large diameter and complex structure of the traditional shock absorber are solved, and a more compact design and simplified flow channel are achieved.
Patent Information
- Application Number
- CN202422513972.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-17
AI Technical Summary
Due to the increase in the external cavity, traditional shock absorbers have too large diameter and complex internal structure, which cannot be effectively simplified.
The piston structure is adopted that is divided into the front inner cavity and the rear inner cavity, and a normal pressure space is formed through the normal pressure cylinder to simplify the flow channel structure and eliminate the outer cavity and flow channel structure.
The radial dimensions of the shock absorber are reduced and the internal runner structure is simplified, achieving a more compact design.
Smart Images
Figure CN223120479U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a novel hydraulic shock absorber, belonging to the technical field of shock absorption equipment. Background Art
[0002] Since the piston rod of the traditional shock absorber exists in the front inner cavity in front of the piston in the inner cavity of the inner cylinder, occupying space in the front inner cavity, and the rear inner cavity behind the piston is full of oil. When the piston is pulled forward, the actual space vacated in the rear inner cavity is larger than that in the front inner cavity. The oil flowing from the front inner cavity into the rear inner cavity through the piston damping hole cannot fill the rear inner cavity. Therefore, additional oil needs to be supplemented to enable the piston to be pulled forward normally. When the piston is pushed backward, the actual compressed space in the rear inner cavity is larger than the space vacated in the front inner cavity. The oil flowing from the rear inner cavity into the front inner cavity through the piston damping hole cannot be fully accommodated in the front inner cavity, resulting in the piston being actually unable to be pushed. Therefore, the excess oil in the rear inner cavity needs to be output outward. In order to obtain oil supplement when the piston is pulled forward and temporarily store the excess oil when the piston is pushed backward, the hydraulic shock absorber of the prior art is provided with an inner and outer double cylinder structure, that is, an annular outer cavity is provided between the inner cylinder and the outer cylinder, and the outer cavity is communicated with the rear inner cavity through an oil passage. When the rear inner cavity is compressed, the excess oil is temporarily stored in the outer cavity space. When the rear inner cavity is stretched, the outer cavity supplies oil to the rear inner cavity, enabling the piston to move normally and perform the shock absorption function.
[0003] Although the traditional shock absorber has well solved the problem of the surplus and deficit of oil in the rear inner cavity during piston movement, due to the addition of the outer cavity, the diameter of the shock absorber is too large, and its internal structure is very complex due to the involvement of multiple seals. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is: how to simplify the internal structure of the shock absorber and reduce the diameter of the shock absorber.
[0005] In view of the above problems, the technical solution proposed by the utility model is:
[0006] A novel hydraulic shock absorber includes a dust cover, a hydraulic cylinder, a piston, a piston rod, a front pull ring and a rear pull ring. The dust cover is sleeved on the front end of the hydraulic cylinder. The two ends of the hydraulic cylinder are respectively sealed by a front end seal and a rear end seal, and its interior is an inner cavity filled with oil. The piston is located in the inner cavity of the hydraulic cylinder and has an axially communicating damping flow channel. The piston divides the inner cavity of the hydraulic cylinder into a front inner cavity and a rear inner cavity. The piston rod is connected to the piston and can push and pull the piston to make the piston reciprocate in the inner cavity of the hydraulic cylinder. Its front end extends out of the front end seal and the dust cover of the hydraulic cylinder and is connected to the front pull ring. The rear pull ring is connected to the rear part of the hydraulic cylinder through a connecting piece. The rear section of the piston rod extends out of the rear end seal of the hydraulic cylinder through the rear inner cavity.
[0007] The connecting member is an atmospheric pressure cylinder. The cylinder opening at the front end of the atmospheric pressure cylinder is butted against the rear end of the hydraulic cylinder to form an atmospheric pressure space for accommodating the rear end portion of the piston rod. The rear pull ring is fixedly connected to the rear end portion of the atmospheric pressure cylinder.
[0008] The outer periphery of the rear end seal body is sealingly sleeved on the inner wall of the hydraulic cylinder. There is a rod hole axially arranged in the center of the rear end seal body, and a sealing ring is provided on the inner wall of the rod hole. The rear end of the piston rod extends backward from the rod hole.
[0009] A limit nut is provided at the rear end of the piston rod. The distance between the limit nut and the rear end seal body is the maximum tensile stroke of the hydraulic shock absorber.
[0010] The distance between the limit nut and the bottom of the atmospheric pressure cylinder is the maximum compression stroke of the hydraulic shock absorber. Advantageous Effects
[0011] There is no need to additionally provide an outer cavity and construct a corresponding flow channel structure outside the inner cavity like a traditional shock absorber, thereby reducing the radial size of the hydraulic shock absorber and simplifying the internal flow channel structure at the same time. Description of the Drawings
[0012] Figure 1 It is a cross-sectional schematic view of the hydraulic shock absorber.
[0013] In the figure: 1. Dust cover; 2. Hydraulic cylinder; 21. Inner cavity; 211. Front inner cavity; 212. Rear inner cavity; 22. Front end seal body; 23. Rear end seal body; 3. Piston; 4. Piston rod; 5. Front pull ring; 6. Rear pull ring; 7. Atmospheric pressure cylinder; 71. Atmospheric pressure space; 8. Sealing ring; 9. Limit nut. Specific Embodiments
[0014] The following further describes the present invention with reference to the drawings:
[0015] First, it should be clarified that the "front" and "rear" orientation terms used herein represent only the directions shown in the views of this specification, and do not limit the directions in the actual application of the product.
[0016] As Figure 1As shown in the figure, a new type of hydraulic shock absorber includes a dust cover 1, a hydraulic cylinder 2, a piston 3, a piston rod 4, a front pull ring 5 and a rear pull ring 6. The dust cover 1 is sleeved on the front end of the hydraulic cylinder 2; both ends of the hydraulic cylinder 2 are sealed by a front end seal body 22 and a rear end seal body 23 respectively, and its inner part is an inner cavity 21 filled with hydraulic fluid; the piston 3 is located in the inner cavity 21 and has axially communicating damping flow channels. The piston 3 divides the inner cavity into a front inner cavity 211 and a rear inner cavity 212; the piston rod 4 is connected to the piston and can push and pull the piston to make the piston 3 reciprocate in the inner cavity of the hydraulic cylinder 2. Its front end extends out of the front end seal body of the hydraulic cylinder 2 and the dust cover 1 and is connected to the front pull ring 5; the rear pull ring 6 is connected to the rear part of the hydraulic cylinder 2 through a connecting piece; the rear section of the piston rod 4 extends out of the rear end seal body of the hydraulic cylinder 2 through the rear inner cavity 212, that is, the piston rod 4 exists not only in the front inner cavity 211 but also in the rear inner cavity 212. When the piston 3 moves forward or backward, the reduction in the space of the front inner cavity 211 is exactly equal to the increase in the rear inner cavity 212, or the increase in the space of the front inner cavity 211 is exactly equal to the reduction in the rear inner cavity 212. In this way, there is no need to additionally set an outer cavity outside the inner cavity 21 and construct a corresponding flow channel structure like a traditional shock absorber, thereby reducing the radial size of the hydraulic shock absorber and simplifying the internal flow channel structure at the same time.
[0017] The connecting piece is an atmospheric pressure cylinder 7. The cylinder mouth at the front end of the atmospheric pressure cylinder 7 is butted against the rear end of the hydraulic cylinder 2 to form an atmospheric pressure space 71 for accommodating the rear end part of the piston rod 4, which is only used for dust and water prevention. The rear pull ring 6 is fixedly connected to the rear end part of the atmospheric pressure cylinder 7.
[0018] The outer periphery of the rear end seal body 23 is sealingly sleeved on the inner wall of the hydraulic cylinder 2. There is an axially arranged rod hole in the center of the rear end seal body 23, and a sealing ring 8 is provided on the inner wall of the rod hole. The rear end of the piston rod 4 extends backward from the rod hole.
[0019] A limit nut 9 is provided at the rear end of the piston rod 4. The distance between the limit nut 9 and the rear end seal body 23 is the maximum tensile stroke of the hydraulic shock absorber. When the limit nut 9 contacts the rear end seal body 23, it prevents the hydraulic shock absorber from continuing to stretch.
[0020] The distance between the limit nut 9 and the bottom of the atmospheric pressure cylinder 7 is the maximum compression stroke of the hydraulic shock absorber. When the limit nut 9 contacts the bottom of the atmospheric pressure cylinder 7, it prevents the hydraulic shock absorber from continuing to compress.
[0021] The above embodiments are only used to describe the present invention more clearly and should not be regarded as limiting the protection scope covered by the present invention. Any modification in an equivalent form should be regarded as falling within the protection scope covered by the present invention.
Claims
1. A new type of hydraulic shock absorber, comprising a dust cover (1), a hydraulic cylinder (2), a piston (3), a piston rod (4), a front pull ring (5) and a rear pull ring (6). The dust cover (1) is sleeved on the front end of the hydraulic cylinder (2). Both ends of the hydraulic cylinder (2) are sealed by a front end seal body (22) and a rear end seal body (23) respectively, and its inner part is an inner cavity (21) filled with hydraulic oil. The piston (3) is located in the inner cavity (21) and has axially communicating damping flow channels. The piston (3) divides the inner cavity (21) into a front inner cavity (211) and a rear inner cavity (212). The piston rod (4) is connected to the piston and can push and pull the piston to make the piston (3) reciprocate in the inner cavity. Its front end extends out of the front end seal body of the hydraulic cylinder (2) and the dust cover (1) and is connected to the front pull ring (5). The rear pull ring (6) is connected to the rear part of the hydraulic cylinder (2) through a connecting piece, and is characterized in that: The rear section of the piston rod (4) extends out from the rear end seal body (23) of the hydraulic cylinder (2) through the rear inner cavity (212).
2. The novel hydraulic shock absorber according to claim 1, wherein: The connecting member is an atmospheric pressure cylinder (7). The cylinder opening at the front end of the atmospheric pressure cylinder (7) is butted against the rear end of the hydraulic cylinder (2) to form an atmospheric pressure space (71) for accommodating the rear end portion of the piston rod (4). The rear pull ring (6) is fixedly connected to the rear end portion of the atmospheric pressure cylinder (7).
3. The novel hydraulic shock absorber according to claim 2, characterized in that: The outer periphery of the rear end seal body (23) is sealingly sleeved on the inner wall of the hydraulic cylinder (2). There is an axially arranged rod hole in the center of the rear end seal body (23), and a sealing ring (8) is provided on the inner wall of the rod hole. The rear end of the piston rod (4) extends backward from the rod hole.
4. The novel hydraulic shock absorber according to claim 2 or 3, characterized in that: A limit nut (9) is provided at the rear end of the piston rod (4). The distance between the limit nut (9) and the rear end seal body (23) is the maximum tensile stroke of the hydraulic shock absorber.
5. The novel hydraulic shock absorber according to claim 4, characterized in that: The distance between the limit nut (9) and the bottom of the atmospheric pressure cylinder (7) is the maximum compression stroke of the hydraulic shock absorber.