Seal and piston mechanism

Abstract

The utility model relates to a sealing element and a piston mechanism. The seal includes an annular seal body and an annular lip. The lip part extends from the sealing main body and forms a free end at one end far away from the sealing main body; the lip part comprises at least one annular and convex lip edge; the free end, away from the sealing body, of the lip portion further comprises a dustproof lip. According to the sealing element, metal particles can be effectively blocked, so that the sealing element has good sealing performance, and the service life of the sealing element is prolonged; in addition, the sealing piece is easy to manufacture and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to sealing technical field. Specifically, the utility model relates to a sealing element for dynamic sealing and a piston mechanism. BACKGROUND

[0002] In the mechanical structure of piston movement, the dynamic sealing between the piston shell and the piston rod needs to be realized through a sealing element. For example, in a hydrostatic clutch actuator, the sealing element is assembled in the shell, the piston reciprocates, the hydrostatic clutch actuator comprises various metal units such as gears and lead screws, and there is a wear problem between the various metal units, which causes a large number of solid metal particles to be generated in the internal space of the actuator, so that the sealing lip of the sealing element is easily worn by the solid metal particles and causes sealing failure and leakage. SUMMARY

[0003] To solve the above technical problems, the utility model provides a sealing element and a piston mechanism.

[0004] In a first aspect, the embodiments of the utility model provide a sealing element, which comprises: an annular sealing body and an annular lip. The lip is extended from the sealing body and forms a free end at an end away from the sealing body; the lip comprises at least one annular and convex lip edge; and the free end of the lip away from the sealing body further comprises a dustproof lip.

[0005] According to some embodiments of the utility model, the sealing element further comprises a waist portion. The waist portion is arranged between the sealing body and the lip; the waist portion is narrowed in the axial direction relative to the sealing body; and the lip can be deflected in the axial direction along with the elastic deformation of the waist portion.

[0006] According to some embodiments of the utility model, when the waist portion is elastically deformed, the lip is deflected so that the direction in which the lip edge protrudes is the radial direction.

[0007] According to some embodiments of the utility model, the lip comprises a plurality of lip edges; when the waist portion is elastically deformed, the lip is deflected so that the direction in which the plurality of lip edges protrude is the radial direction, and the radial heights of the plurality of lip edges are consistent.

[0008] According to some embodiments of the utility model, when the waist portion is elastically deformed, the lip is deflected so that the direction in which the lip edge protrudes is the radial direction, and the radial height of the dustproof lip is less than the radial height of the lip edge.

[0009] According to some embodiments of the utility model, the dustproof lip is provided with at least one dustproof lip groove in the circumferential direction.

[0010] According to some embodiments of the present application, the lip portion comprises a plurality of lips, and annular lip grooves are formed between adjacent two lips and between the lip portion adjacent to the dustproof lip and the dustproof lip.

[0011] According to some embodiments of the present application, the sealing member is made of rubber material, and the sealing body and the lip portion are integrally formed by molding.

[0012] In a second aspect, the embodiments of the present application provide a piston mechanism, comprising: a piston housing, a piston rod, and the sealing member according to any one of the above embodiments. The piston housing has an accommodating chamber inside; the piston rod is located in the accommodating chamber of the piston housing and can reciprocate in the axial direction; the sealing member is arranged between the piston housing and the piston rod in the radial direction; wherein the sealing body is fixedly arranged on one of the piston housing and the piston rod, and the lip portion forms a dynamic seal with the other one of the piston housing and the piston rod.

[0013] According to some embodiments of the present application, after the sealing member is assembled between the piston housing and the piston rod, the lip portion is deflected to the direction that the lips protrude in the radial direction, and abuts against one of the piston housing and the piston rod that forms a dynamic seal with the lip portion, and the dustproof lip forms a gap seal with the one of the piston housing and the piston rod that forms a dynamic seal with the lip portion.

[0014] By the sealing member of the present application, the sealing body of the sealing member is fixed on one of the two relatively moving sealed members, such as one of the piston housing and the piston rod in the piston mechanism, and at least one lip in the lip portion of the sealing member abuts against the other one of the two relatively moving sealed members, such as the other one of the piston housing and the piston rod in the piston mechanism, through the elastic deformation of the sealing member, so that good sealing performance can be achieved.

[0015] Further, the sealing member of the present application further comprises a dustproof lip, the sealed member abutted by the lip has a small gap, forming a gap seal, which can effectively prevent solid metal particles from entering between the lip portion and the sealed member; the dustproof lip, the sealing body and the waist portion form a structure similar to a funnel, which can collect solid metal particles, thereby further protecting the lip portion to maintain good sealing performance of the sealing member and improve the service life of the sealing member. Further, a dustproof lip groove is further formed on the dustproof lip, so that the dustproof lip is easy to deform to better collect solid metal particles.

[0016] In addition, the sealing member is easy to manufacture and has low cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 A partial sectional view of a piston mechanism according to an embodiment of the present application is shown;

[0019] Figure 2 A partial schematic view of a seal according to an embodiment of the present application is shown;

[0020] Figure 3 A partial sectional view of a piston mechanism according to an embodiment of the present application is shown; and

[0021] Figure 4 A partial schematic view of a dust lip according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be clearly and completely described below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0023] According to an embodiment of the present application, a seal is provided. The seal is used in various mechanical structures with piston movement requiring sealing. The seal of the present application is particularly suitable for use in mechanical structures with piston movement in which the internal environment is easily contaminated by solid particles.

[0024] For example, in a hydrostatic clutch actuator, the piston reciprocates relative to the actuator housing, and the hydrostatic clutch actuator includes various metal units, and there is a wear problem between the various metal units, such as gears and lead screws, resulting in a large number of solid metal particles in the internal space of the actuator. The actuator housing and the piston can be dynamically sealed by the seal, and in particular, the seal of the present application is required to effectively block the solid metal particles.

[0025] Of course, the seal of the present application can also be applied to other relative reciprocating mechanisms requiring dynamic sealing.

[0026] Figure 1A partial sectional view of a piston mechanism according to an embodiment of the present application is shown. The piston mechanism comprises a piston housing 1, a piston rod 2 and a seal 3, the piston housing 1 and the piston rod 2 are capable of reciprocating along an axial direction, and the seal 3 is arranged between the piston housing 1 and the piston rod 2 in a radial direction to form a dynamic seal between the piston housing 1 and the piston rod 2.

[0027] Specifically, Figure 2 A partial schematic view of the seal 3 according to an embodiment of the present application is shown. It should be understood that the seal 3 is annular as a whole, Figure 2 A partial perspective view of the seal 3 is shown, and a cross section of the seal 3 is shown. As Figure 2 shown, the seal comprises an annular seal body 31 and an annular lip 32. The lip 32 extends from the seal body 31 and forms a free end at an end away from the seal body 31; the lip 32 comprises at least one annular, convex lip edge 321; the free end of the lip 32 away from the seal body 31 further comprises a dust lip 322.

[0028] In combination Figure 1 and Figure 2 shown, the seal body 31 of the seal 3 is fixedly arranged on one of the piston housing 1 and the piston rod 2, and the free end of the lip 32 is capable of abutting the other of the piston housing 1 and the piston rod 2, and in a working state, the lip 32 slides relative to the piston housing 1 or the piston rod 2 to which it abuts to form a dynamic seal.

[0029] For example, in Figure 1 , the seal body 31 is arranged on the circumferential side of the piston housing 1 facing the piston rod 2, and the lip 32 extends from the seal body 31 towards the piston rod 2. It can be understood that in other embodiments, the seal body 31 of the seal 3 can also be fixed to the circumferential side of the piston rod 2 facing the seal body 31, and at this time the lip 32 should extend from the seal body 31 towards the piston housing 1.

[0030] The lip edge 321 can be arranged on the side of the lip 32 facing the piston housing 1 or the piston rod 2 to which it abuts. For example, in Figure 1 , the lip edge 321 can be arranged on the side of the lip 32 facing the piston rod 2, so that the lip edge 321 abuts the piston rod 2 and is capable of sliding relative to the piston rod 2 to form a dynamic seal.

[0031] Further, in a state where the seal 3 is not assembled, as Figure 2 shown, the lip 32 can extend generally radially away from the seal body 31, and the lip edge 321 can be arranged on the axial side of the lip 32. And Figure 3 A partial sectional view of a piston mechanism according to an embodiment of the present application is shown in a state where the seal 3 is assembled. As Figure 3As shown, in the state that the seal 3 is assembled, the piston housing 1 and the piston rod 2 can extrude the elastic seal 3 to cause elastic deformation, so that the lip 32 is deflected towards the axial direction, and the protruding direction of the lip 321 is towards the piston housing 1 or the piston rod 2 that the lip 32 abuts against. For example, in the state shown in Figure 3 , the lip 32 abuts against and slides against the piston rod 2 to form a dynamic seal, at this time, the protruding direction of the lip 321 is deflected to a direction generally along the radial direction towards the piston rod 2.

[0032] In some embodiments, the seal 3 can be made of a rubber material with elastic properties, and the seal body 31 and the lip 32 can be integrally formed by molding. The seal 3 realizes the deflection of the lip 32 through its own structure and the elastic deformation performance of the rubber material. Among them, the seal 3 realizes the deflection of the lip 32 through its own structure can be realized by the following embodiments.

[0033] In some embodiments, the seal 3 further comprises a waist portion 33. The waist portion 33 is arranged between the seal body 31 and the lip 32; the waist portion 33 is narrowed in the axial direction relative to the seal body 31; and the lip 32 can be deflected in the axial direction with the elastic deformation of the waist portion 33. Preferably, the waist portion 33 is narrowed in the axial direction relative to the seal body 31 and the lip 32.

[0034] It can be understood that the waist portion 33 narrowed in the axial direction is more likely to be elastically deformed by bending in the axial direction, so that the lip 32 as a free end can be easily deflected. At the same time, the waist portion 33 should not be too narrow, and needs to ensure sufficient structural strength, so that the waist portion 33 is not easy to break, and can provide the lip 32 with sufficient resilience towards the piston housing 1 or the piston rod 2 that the lip 32 abuts against, so that the lip 32 can always be closely abutted on the piston housing 1 or the piston rod 2 that relatively slides. In addition, due to the relative reciprocating motion of the piston housing 1 and the piston rod 2 of the piston mechanism, when the relative motion direction of the piston housing 1 and the piston rod 2 changes, the waist portion 33 with sufficient structural strength can support the lip 32 not to be turned over, that is, the deflected direction of the lip 32 does not change due to the change of the piston motion direction, so as to ensure that the lip 321 and the piston housing 1 or the piston rod 2 that the lip 321 abuts against always maintain stable sealing contact during the reciprocating motion of the piston mechanism.

[0035] As shown in Figure 3 , taking the example that the seal body 31 is fixed to the piston housing 1, by providing the seal 3 with the waist portion 33, when the waist portion 33 is elastically deformed, the lip 32 is deflected so that the protruding direction of the lip 321 is generally along the radial direction towards the piston rod 2.

[0036] To further improve the sealing effect, the lip 32 may include multiple lip edges 321. The multiple lip edges 321 simultaneously abut against the relatively sliding piston housing 1 or piston rod 2 (e.g., Figure 3 The piston rod is in the middle (2). External impurities, such as lubricating oil, grease, and metal particles, need to pass through multiple lips (321) to enter the piston mechanism, thus effectively improving the sealing effect.

[0037] Specifically, in Figure 2 In the illustrated embodiment, the lip 32 includes a first lip edge 321a and a second lip edge 321b. Annular lip grooves 323 can be formed between adjacent first lip edges 321a and second lip edges 321b, and between the first lip edge 321a and the dustproof lip 322. The lip grooves 323 can collect and store lubricating oil and grease to improve sealing performance.

[0038] Furthermore, such as Figure 3 As shown, when the waist 33 undergoes elastic deformation, the lip 32 deflects so that the direction in which the plurality of lip edges 321 protrude is generally radial and toward the piston housing 1 or piston rod 2 it abuts. Figure 3 (For piston rod 2), at this time, the radial heights of multiple lips 321 are consistent. By setting the lips 32 to have the same radial height after deflection, multiple lips 321 can simultaneously abut against the relatively sliding piston housing 1 or piston rod 2 (for piston rod 2). Figure 3 For piston rod 2), it avoids only part of the lip edge 321 abutting to form a seal, and also ensures that the axial force (sliding friction) on multiple lips 321 is roughly the same, the force on multiple lips 321 is more uniform, and the situation of excessive axial force on some lips 321 is reduced, thus improving the service life of seal 3.

[0039] In addition, in some optional embodiments, the lip 321 can be designed as a structure that is symmetrical on both sides of the axis to further ensure that the axial forces on the lip 321 are substantially the same in both directions during the reciprocating motion of the piston mechanism, so that the lip 321 and the piston housing 1 or piston rod 2 it abuts always maintain a stable sealing contact.

[0040] The dustproof lip 322 of this utility model is mainly used to block solid metal particles in the piston mechanism. Figure 4 A partial schematic diagram of a dustproof lip 322 according to an embodiment of the present invention is shown. In some alternative embodiments, when the seal 3 is in the assembled state, i.e., when the waist 33 undergoes elastic deformation, the lip 32 deflects so that the direction in which the lip edge 321 protrudes is radial, and the radial height of the dustproof lip 322 is less than the radial height of the lip edge 321. In this case, the dustproof lip 322 abuts against the piston housing 1 or piston rod 2 (e.g., the lip edge 321).Figure 3 There is a small gap between the piston rod 2, forming a gap seal. Simulation experiments show that the gap size of the small gap can be less than 0.2mm, which can effectively prevent solid metal particles in the piston mechanism from entering the piston housing 1 or the piston rod 2 abutting the lip 321 (for example Figure 3 There is a small gap between the piston rod 2.

[0041] In addition, as Figure 3 shown, the dust lip 322 and the sealing body 31 and the waist 33 can also form a structure similar to a funnel, which is beneficial to collect solid metal particles, thereby further protecting the lip 32 to maintain the good sealing performance of the seal 3 and improve the service life of the seal.

[0042] Further, as Figure 4 shown, the dust lip 322 is provided with at least one dust lip groove 3221 in the circumferential direction, so that the dust lip 322 is easy to deform to better collect solid metal particles.

[0043] According to the embodiments of the utility model, a piston mechanism is also provided. As Figure 1 and Figure 3 shown, in some embodiments, the piston mechanism comprises: a piston housing 1, a piston rod, and a seal 3 according to any one of the above embodiments. The piston housing 1 has a containing chamber inside; the piston rod 2 is located in the containing chamber of the piston housing 1 and can reciprocate in the axial direction; the seal 3 is arranged between the piston housing 1 and the piston rod 2 in the radial direction. Among them, the sealing body 31 is fixedly arranged in one of the piston housing 1 and the piston rod 2 (for example Figure 1 and Figure 3 the embodiment is fixedly arranged in the piston housing 1), the lip 32 abuts the other of the piston housing 1 and the piston rod 2 to form a dynamic seal.

[0044] In some embodiments, after the seal 3 is assembled between the piston housing 1 and the piston rod 2, the lip 32 is deflected to the direction in which the lip 321 protrudes is the radial direction, and abuts the piston housing 1 or the piston rod 2 (for example Figure 1 and Figure 3 the embodiment is the piston rod 2) which forms a dynamic seal with the lip 32, the dust lip 322 has a small gap between the piston housing 1 or the piston rod 2 (for example Figure 1 and Figure 3 the embodiment is the piston rod 2) which forms a dynamic seal with the lip 32, forming a gap seal.

[0045] The specific structure and working principle of the seal 3 are described in the foregoing embodiments, which will not be repeated here.

[0046] By the sealing element 3, the sealing body 31 of the sealing element 3 is fixed to one of the two relative motion sealed members, such as one of the piston housing 1 and the piston rod 2 in the piston mechanism, and at least one lip 321 in the lip portion 32 of the sealing element 3 is abutted to the other one of the two relative motion sealed members, such as the other one of the piston housing 1 and the piston rod 2 in the piston mechanism, through the elastic deformation of the sealing element 3, so that good sealing performance can be achieved. Moreover, the sealing element 3 of the utility model further comprises a dustproof lip 322, the sealed member abutted by the dustproof lip 322 has a small gap, forming a gap seal, which can effectively block solid metal particles from entering between the lip 321 and the sealed member; the dustproof lip 322 and the sealing body 31 and the waist portion 33 form a structure similar to a funnel, which can collect solid metal particles, thereby further protecting the lip portion 32, so as to maintain good sealing performance of the sealing element 3 and improve the service life of the sealing element. In addition, the sealing element 3 is easy to manufacture and has low cost.

[0047] It should be noted that the utility model aims to improve the sealing element in the piston mechanism, so the technical scheme of the utility model can be applied to dynamic sealing of various devices with relative linear motion, and is not limited to specific components of the specific device shown in the embodiments. The number, shape and arrangement of the lip portion of the sealing element can not be limited to the above description.

[0048] Although the possible embodiments are exemplarily described in the above description, it should be understood that there are still a large number of embodiment changes through the combination of all known and otherwise easily thought of technical features and embodiments. In addition, it should also be understood that the exemplary embodiments are only as an example, and such embodiments in no way limit the protection scope, application and structure of the utility model. The foregoing description is more to provide a technical guide for converting at least one exemplary embodiment to the skilled person, wherein various changes can be made as long as they do not deviate from the protection scope of the claims, especially changes in the function and structure of the components.

Claims

1. A seal, characterized in that, Comprising: a ring-shaped sealing body (31); and a ring-shaped lip (32) extended from the sealing body (31) and formed with a free end at an end away from the sealing body (31); the lip (32) comprises at least one ring-shaped, convex lip edge (321); the free end of the lip (32) away from the sealing body (31) further comprises a dust lip (322).

2. The seal of claim 1, wherein Further comprising: a waist (33); the waist (33) is arranged between the sealing body (31) and the lip (32); the waist (33) is narrowed in the axial direction relative to the sealing body (31); the lip (32) can be deflected in the axial direction along with the elastic deformation of the waist (33).

3. The seal of claim 2, wherein, When the waist (33) is elastically deformed, the lip (32) is deflected so that the direction in which the lip edge (321) protrudes is the radial direction.

4. The seal of claim 3, wherein, The lip (32) comprises a plurality of lip edges (321); when the waist (33) is elastically deformed, the lip (32) is deflected so that the direction in which the plurality of lip edges (321) protrude is the radial direction, and the radial heights of the plurality of lip edges (321) are consistent.

5. The seal of claim 3, wherein When the waist (33) is elastically deformed, the lip (32) is deflected so that the direction in which the lip edge (321) protrudes is the radial direction, and the radial height of the dust lip (322) is less than the radial height of the lip edge (321).

6. The seal of claim 1, wherein The dust lip (322) is provided with at least one dust lip groove (3221) in the circumferential direction.

7. The seal of claim 1, wherein The lip (32) comprises a plurality of lip edges (321), and an annular lip edge groove (323) is formed between adjacent two lip edges (321) and between the lip edge (321) adjacent to the dust lip (322) and the dust lip (322).

8. The seal of claim 1, wherein The seal is made of rubber material, and the sealing body (31) and the lip (32) are integrally formed by molding.

9. A piston mechanism characterized by, Comprising: a piston housing (1) having an accommodation chamber inside; a piston rod (2) located in the accommodation chamber of the piston housing (1) and capable of reciprocating in the axial direction; and the seal (3) according to any one of claims 1-8 is arranged radially between the piston housing (1) and the piston rod (2); wherein the sealing body (31) is fixedly arranged on one of the piston housing (1) and the piston rod (2), and the lip (32) forms a dynamic seal with the other one of the piston housing (1) and the piston rod (2).

10. The piston mechanism of claim 9, wherein After the seal (3) is assembled between the piston housing (1) and the piston rod (2), the lip (32) is deflected so that the direction in which the lip edge (321) protrudes is the radial direction, and abuts against one of the piston housing (1) and the piston rod (2) which forms a dynamic seal with the lip (32), and the dust lip (322) forms a gap seal with the one of the piston housing (1) and the piston rod (2) which forms a dynamic seal with the lip (32).

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