Low-friction shock absorber oil seal

Abstract

The utility model discloses a low-friction shock absorber oil seal which comprises a piston rod and a metal framework, a hyperelastic sealing body is arranged on the metal framework, and a dustproof lip and an oil sealing lip are respectively arranged on the inner surface of the hyperelastic sealing body. According to the low-friction shock absorber oil seal, the dustproof lip and the oil sealing lip are located at the top end and the bottom end of the hyperelastic sealing body respectively, and the dustproof lip and the oil sealing lip are both in interference fit with the piston rod. According to the low-friction shock absorber oil seal, the grease storage cavity is formed in the contact portion of the dustproof lip and the piston rod, lubricating grease used for the contact portion of the dustproof lip is stored in the grease storage cavity, lasting lubricating grease is provided for a lip opening contact area, and the friction coefficient of the contact portion of the dustproof lip and the piston rod can be effectively reduced in a lasting mode; the radial sealing force of the dustproof seal can be guaranteed, meanwhile, sufficient and lasting lubrication can be provided, therefore, the friction force between the shock absorber dustproof lip and the shock absorber piston rod is reduced, the comfort performance of the shock absorber is improved, and the service life of the shock absorber is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorber seals, in particular to a low-friction shock absorber oil seal. Background Art

[0002] Shock absorbers are common components of motor vehicles. Shock absorber oil seals usually include two lips: an oil sealing lip and a dustproof lip. The dustproof performance and friction performance of the dustproof lip play a vital role in the service life and comfort performance of the shock absorber.

[0003] For example, a new type of oil seal for shock absorbers with publication number CN219866253U forms a combined sealing part by interlocking a PTFE ring and a rubber. In addition to the old rubber seal, the PTFE ring performs secondary sealing under the elastic support of the rubber to improve the sealing effect; the sliding friction between the PTFE ring and the piston rod is small, the temperature rise is slow, and the service life of the oil seal is increased; by adding a dustproof lip structure and using a dustproof spring to provide a clamping force, the dustproof function of the oil seal is better; by setting the middle part of the rubber matrix in a D-shaped structure, the radial stiffness is reduced and the eccentricity resistance is improved;

[0004] When the above technical solution is in use, a combined sealing part is formed by the PTFE ring and the rubber interlocking to perform secondary sealing and improve the sealing effect. However, the dust lip is in contact with the piston rod for a long time and rubs against it, causing the dust lip to be worn. However, the existing shock absorber oil seal lacks the function of self-lubrication, resulting in the greater the friction coefficient, the faster the dust lip wears and the shorter the service life. At the same time, the greater the friction coefficient, the unchanged sealing clamping force between the dust lip and the piston rod, the greater the friction, the faster the dust lip wears and the worse the dustproof ability.

[0005] Therefore, we proposed that low-friction shock absorber oil seal can solve the above problems well. Utility Model Content

[0006] The utility model aims to provide a low-friction shock absorber oil seal to solve the problem that the existing shock absorber oil seal lacks the self-lubricating function, resulting in the greater the friction coefficient, the faster the dust lip wears and the shorter the service life; at the same time, the greater the friction coefficient, the sealing clamping force between the dust lip and the piston rod remains unchanged, the greater the friction, the faster the dust lip wears and the worse the dustproof ability.

[0007] To achieve the above object, the utility model provides the following technical solutions: a low friction shock absorber oil seal, comprising a piston rod and a metal frame, a superelastic sealing body is arranged on the metal frame, and a dustproof lip and an oil sealing lip are respectively arranged on the inner surface of the superelastic sealing body;

[0008] A low friction damper oil seal, further comprising:

[0009] The dustproof lip and the oil sealing lip are respectively located at the top and bottom ends of the superelastic sealing body, and both the dustproof lip and the oil sealing lip are interference fit with the piston rod;

[0010] The inner cavity of the dustproof lip is provided with a cavity with an arc-shaped cross section, and the cavity contacts the surface of the piston rod to form a grease storage cavity. The dustproof lip is provided with two supporting lips, and the annular sealing surface of the dustproof lip is evenly distributed with honeycomb-shaped micro grooves for storing grease.

[0011] Preferably, the metal skeleton is connected to the superelastic sealing body by vulcanization bonding, and the two metal skeletons are symmetrically distributed on the left and right sides of the piston rod.

[0012] Preferably, the dustproof lip, the oil sealing lip and the two supporting lips constitute a dustproof structure, and the lip tip of the dustproof lip is in contact with the surface of the piston rod.

[0013] Preferably, a metal skeleton is vulcanized and bonded to the inner side of the superelastic sealing body, a spring groove may be provided on the outer side of the superelastic sealing body, and a metal spring is installed in the spring groove, and the metal skeleton adopts a rigid body structure.

[0014] Preferably, the superelastic sealing body is made of nitrile rubber, hydrogenated nitrile rubber, fluororubber or polyurethane material.

[0015] Preferably, the cross-section of the micro groove along the radial direction is wavy, arc-shaped, triangular or trapezoidal.

[0016] Compared with the prior art, the beneficial effects of the utility model are: the low friction shock absorber oil seal adopts a new structural design, the specific contents of which are as follows:

[0017] (1) By providing a grease storage cavity at the contact portion between the dust lip and the piston rod, the grease used for the contact portion of the dust lip is stored in the grease storage cavity, providing long-lasting grease for the lip contact area, and effectively reducing the friction coefficient of the contact portion between the dust lip and the piston rod, so that it can provide sufficient and long-lasting lubrication while ensuring the radial sealing force of the dust seal, thereby reducing the friction between the shock absorber dust lip and the shock absorber piston rod, improving the comfort performance of the shock absorber, and extending the service life of the shock absorber;

[0018] Furthermore, the dustproof lip and the supporting lip are always in contact with the piston rod by means of the provided metal spring, thereby ensuring the stability and sealing of the oil seal. By generating a certain radial tightening force, the oil seal can be prevented from loosening or falling off during vibration or high-speed rotation, thereby maintaining the sealing effect and preventing deviation.

[0019] Furthermore, by utilizing the provided micro grooves, the grease can be infiltrated into the micro grooves, thereby achieving a lasting and effective effect of reducing the friction coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the local structure of the utility model.

[0022] In the figure: 1. Metal skeleton; 2. Super elastic sealing body; 3. Piston rod; 4. Dustproof structure; 401. Dustproof lip; 402. Oil sealing lip; 403. Second support lip; 5. Micro groove; 6. Metal spring; 7. Grease storage cavity. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 and Figure 2 , the utility model provides the following technical solutions: a low friction shock absorber oil seal;

[0025] Embodiment 1: In order to solve the problem that the existing shock absorber oil seal in the prior art lacks the self-lubricating function, resulting in the dust lip 401 wearing faster and having a shorter service life as the friction coefficient increases, and at the same time, the dust lip 401 and the piston rod 3 have a constant sealing clamping force, the greater the friction force, the faster the lip of the dust lip 401 wears, and the worse the dustproof ability, the following scheme is disclosed, and specific reference is made to Figure 1 and Figure 2 As shown, it includes a piston rod 3 and a metal skeleton 1, a superelastic sealing body 2 is arranged on the metal skeleton 1, the metal skeleton 1 and the superelastic sealing body 2 are connected by vulcanization bonding, the two metal skeletons 1 are symmetrically distributed on the left and right sides of the piston rod 3, the metal skeleton 1 is vulcanized and bonded on the inner side of the superelastic sealing body 2, the metal skeleton 1 adopts a rigid body structure, the superelastic sealing body 2 is made of nitrile rubber, hydrogenated nitrile rubber, fluororubber or polyurethane material, and the inner surface of the superelastic sealing body 2 is respectively provided with a dustproof lip 401 and an oil sealing lip 402;

[0026] It also includes: a dustproof lip 401 and an oil-sealing lip 402 are respectively located at the top and bottom ends of the superelastic sealing body 2, and the dustproof lip 401 and the oil-sealing lip 402 are both interference fit with the piston rod 3; a cavity with an arc-shaped cross-section is provided in the inner cavity of the dustproof lip 401, and the cavity contacts the surface of the piston rod 3 to form a grease storage cavity 7, and two supporting lips 403 are provided at the dustproof lip 401, and the dustproof lip 401, the oil-sealing lip 402 and the two supporting lips 403 constitute a dustproof structure 4, and the lip tip of the dustproof lip 401 contacts the surface of the piston rod 3.

[0027] By providing a grease storage cavity 7, the grease is stored in the area near the contact area between the tip of the dust lip 401 and the piston rod 3, so that the grease can have space for long-term storage, providing long-lasting grease for the lip contact area; a micro groove 5 for storing grease is designed on the annular sealing surface formed by the sealing lip, and each lip is coated with grease and there is a grease storage cavity 7 for conveying grease near the contact part, which can effectively and permanently reduce the friction coefficient between the dust lip 401 and the piston rod 3, so that it can reduce the friction between the oil seal dust lip 401 and the shock absorber piston rod 3 by providing sufficient and long-lasting lubrication while ensuring the radial sealing force of the dust lip 401, thereby improving the comfort performance of the shock absorber and extending the service life of the shock absorber.

[0028] Embodiment 2: Different from Embodiment 1, this embodiment uses the metal spring 6 to ensure that the dust lip 401 and the second support lip 403 are always in contact with the piston rod 3 to ensure the stability and sealing of the oil seal. Figure 1 and Figure 2 As shown, a spring groove may be provided on the outer side of the superelastic sealing body 2, and a metal spring 6 is installed in the spring groove;

[0029] By utilizing the provided metal spring 6, the dustproof lip 401 and the second supporting lip 403 are always in contact with the piston rod 3, ensuring the stability and sealing of the oil seal. By generating a certain radial tightening force, the oil seal can be prevented from loosening or falling off during vibration or high-speed rotation, thereby maintaining the sealing effect.

[0030] Embodiment 3: Different from Embodiment 2, this embodiment utilizes the micro grooves 5 to allow the grease to penetrate into the micro grooves 5, thereby achieving a lasting and effective effect of reducing the friction coefficient. For details, refer to Figure 1 and Figure 2 As shown, the annular sealing surface of the dust lip 401 is uniformly distributed with honeycomb-shaped micro grooves 5 for storing grease, and the cross-section of the micro grooves 5 along the radial direction is wavy, arc-shaped, triangular or trapezoidal;

[0031] By utilizing the provided micro grooves 5 , the grease can be infiltrated into the micro grooves 5 , thereby achieving a lasting and effective effect of reducing the friction coefficient.

[0032] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-friction shock absorber oil seal, comprising a piston rod (3) and a metal frame (1), wherein a superelastic sealing body (2) is arranged on the metal frame (1), and a dustproof lip (401) and an oil sealing lip (402) are respectively arranged on the inner surface of the superelastic sealing body (2); It is characterized in that Also includes: The dustproof lip (401) and the oil-sealing lip (402) are respectively located at the top and bottom ends of the superelastic sealing body (2), and both the dustproof lip (401) and the oil-sealing lip (402) are interference-fitted with the piston rod (3); The inner cavity of the dustproof lip (401) is provided with a cavity with an arc-shaped cross section, and the cavity contacts the surface of the piston rod (3) to form a grease storage cavity (7). The dustproof lip (401) is provided with two supporting lips (403), and the annular sealing surface of the dustproof lip (401) is evenly distributed with honeycomb-shaped micro grooves (5) for storing grease.

2. A low friction shock absorber oil seal according to claim 1, characterized in that: The metal skeleton (1) is connected to the superelastic sealing body (2) by vulcanization bonding, and the two metal skeletons (1) are symmetrically distributed on the left and right sides of the piston rod (3).

3. A low friction shock absorber oil seal according to claim 1, characterized in that: The dustproof lip (401), the oil sealing lip (402) and the two supporting lips (403) constitute a dustproof structure (4), and the lip tip of the dustproof lip (401) is in contact with the surface of the piston rod (3).

4. A low friction shock absorber oil seal according to claim 1, characterized in that: The inner side of the superelastic sealing body (2) is vulcanized and bonded with a metal frame (1), the outer side of the superelastic sealing body (2) may be provided with a spring groove, and a metal spring (6) is installed in the spring groove, and the metal frame (1) adopts a rigid body structure.

5. The low friction shock absorber oil seal according to claim 1, characterized in that: The super elastic sealing body (2) is made of nitrile rubber, hydrogenated nitrile rubber, fluororubber or polyurethane material.

6. A low friction shock absorber oil seal according to claim 1, characterized in that: The cross-section of the micro groove (5) along the radial direction is wave-shaped, arc-shaped, triangular or trapezoidal.

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