jig

Abstract

A jig is used to install a piston oil seal on a clutch housing. The jig is a cylindrical body with an inner ring surface and an outer ring surface, and a virtual axis is defined to pass through the center of the jig, and a virtual reference line is defined to extend along the outer ring surface, wherein the reference line and the axis intersect to form an angle, and the angle is between 2 and 15 degrees. The jig is pre-set on a shaft tube of the clutch housing, and then the piston oil seal is sleeved on the jig with its mounting hole and slides to the bottom of the jig. After the jig is removed, a rubber sealing lip of the piston oil seal is enabled to abut the circumferential surface of the shaft tube. This is to avoid improper rupture of the rubber sealing lip during installation.

Description

Technical Field

[0001] The utility model relates to the installation of an oil seal, in particular to a fixture for installing a piston oil seal on a clutch housing. Background Art

[0002] Known oil seals are designed in various specifications and shapes according to the requirements of the use environment. For example, an oil seal used on a rotating shaft of a mechanical device generally includes a main frame and a rubber sealing lip. The main frame is made of metal iron and has a through hole. The rubber sealing lip is arranged along the periphery of the through hole. When the rotating shaft passes through the through hole, the lip edge of the rubber sealing lip abuts against the surface of the rotating shaft, thereby preventing the fluid used for lubrication in the mechanical device from overflowing and preventing external impurities (such as sewage, dust, etc.) from improperly entering the mechanical device.

[0003] The object on which the oil seal is mounted is a rotating shaft. However, in other application examples, the oil seal is also mounted on the shaft tube of an object, such as a hydraulic clutch. In this case, the object on which the oil seal is mounted is the shaft tube of the clutch housing, and a hydraulic chamber is formed between the oil seal and the inner surface of the clutch housing. The rubber sealing lip of the oil seal provides a good sealing effect for the hydraulic chamber. Therefore, ensuring that the rubber sealing lip of the oil seal does not rupture during the installation process is a topic that must be avoided and deserves attention. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a jig which can ensure that the rubber sealing lip of the oil seal will not break during the installation process.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a jig for installing a piston oil seal on a clutch housing, wherein the piston oil seal has a mounting hole, and a rubber sealing lip is arranged on the periphery of the mounting hole, and the clutch housing has a shaft tube; wherein the jig is a cylindrical body having an inner annular surface and an outer annular surface, and a virtual axis is defined passing through the center of the jig, and a virtual reference line is defined extending along the outer annular surface, and the reference line intersects with the axis to form an angle, and the angle is between 2 and 15 degrees.

[0006] In one embodiment, the jig has a leading edge and a trailing edge located at opposite ends, and the jig is divided into a connecting section, an outward expansion section and a sleeve section in the extension direction of the axis, the connecting section is close to the leading edge, the sleeve section is close to the trailing edge, and the outward expansion section is located between the connecting section and the sleeve section; wherein the thickness of the connecting section of the jig between the inner annular surface and the outer annular surface is equal in width, the thickness of the outward expansion section of the jig between the inner annular surface and the outer annular surface increases toward the trailing edge, and the reference line is extended along the outer annular surface of the outward expansion section.

[0007] In one embodiment, the space enclosed by the inner annular surface constitutes an axial hole, the axis passes through the center of the axial hole, the axial hole has a small diameter hole section and a large diameter hole section adjacent to each other, the small diameter hole section is formed correspondingly at the connecting section and the outward expansion section, the large diameter hole section is formed correspondingly at the sleeve section, and the aperture of the small diameter hole section is smaller than the aperture of the large diameter hole section; wherein the fixture sleeves the axial tube with the large diameter hole section of its axial hole.

[0008] In one embodiment, the outer annular surface of the fixture is provided with a curved surface at the front edge.

[0009] In one embodiment, the angle is between 4 and 10 degrees.

[0010] In one embodiment, the centerline average roughness (Ra) of the outer annular surface of the fixture is less than 1.6 μm.

[0011] The utility model has the advantages that the jig is preliminarily sleeved on the shaft tube of the clutch housing, and then the piston oil seal is sleeved on the jig with its mounting hole and slides to the bottom of the jig. After the jig is removed, the rubber sealing lip of the piston oil seal can abut against the peripheral surface of the shaft tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a cross-sectional view of a hydraulic clutch;

[0013] Figure 2 This is a schematic diagram of the application of a fixture in a preferred embodiment of the utility model;

[0014] Figure 3 A three-dimensional diagram of a fixture of the above preferred embodiment of the utility model;

[0015] Figure 4 It is a cross-sectional view of the jig of the above preferred embodiment of the utility model;

[0016] Figure 5 for Figure 4 A partial enlarged view of the jig shown;

[0017] Figures 6 to 10 A schematic diagram of the steps of installing the piston oil seal of a hydraulic clutch onto a clutch housing using the jig of the utility model is disclosed.

[0018]

Explanation of symbols

[0019] 100: Hydraulic clutch

[0020] 10: Piston oil seal

[0021] 12: Mounting hole

[0022] 14: Rubber sealing lip

[0023] 20: Clutch housing

[0024] 22: Axle tube

[0025] 30:Jig

[0026] 30a: Front edge

[0027] 30b: trailing edge

[0028] 32: Inner ring

[0029] 34: Outer ring

[0030] 36: shaft hole

[0031] 36a: Small diameter hole section

[0032] 36b: Large diameter hole section

[0033] 38: Shoulder

[0034] D1,D2: aperture

[0035] L1: Axis

[0036] L2: Reference Line

[0037] T1: Transition segment

[0038] T2: Expansion section

[0039] T3: Socket segment

[0040] θ: Angle DETAILED DESCRIPTION

[0041] In order to explain the present invention more clearly, a preferred embodiment is given and described in detail with the accompanying drawings. First of all, the jig of the present invention is used to install a piston oil seal on a clutch housing. The piston oil seal and the clutch housing are one of the components of the hydraulic clutch of the vehicle gearbox. Figure 1 As shown, the composition of the hydraulic clutch 100 is disclosed, wherein the piston oil seal 10 is sleeved on an inwardly protruding shaft tube 22 of the clutch housing 20; Figure 2 As shown, the piston oil seal 10 is provided with a mounting hole 12 to sleeve the shaft tube 22, and a rubber sealing lip 14 provided on the periphery of the mounting hole 12 can abut against the circumference of the shaft tube 22 ( Figure 1 Reference). The fixture of the present invention is designed to ensure that the rubber sealing lip 14 of the piston oil seal 10 will not be broken during the installation process. The structural features of the fixture are described below.

[0042] Please refer to Figure 3As shown, the jig 30 of the preferred embodiment of the present invention is made of polyoxymethylene (POM for short). In other embodiments, it can also be made by mixing with other materials, for example, it can be a mixed material of polyoxymethylene and nylon. The jig 30 is a cylindrical body having an inner annular surface 32 and an outer annular surface 34, and the jig 30 has a front edge 30a and a rear edge 30b located at opposite ends. The jig 30 has an axial hole 36 surrounded by the inner annular surface 32, and a virtual axis L1 is defined passing through the center of the axial hole 36, as shown in FIG. Figure 4 As shown, the jig 30 is divided into a connecting section T1, an outward expansion section T2 and a sleeve section T3 in the extension direction of the axis L1, wherein the connecting section T1 is close to the leading edge 30a, the sleeve section T3 is close to the trailing edge 30b, and the outward expansion section T2 is located between the connecting section T1 and the sleeve section T3. In addition, the thickness of the connecting section T1 of the jig 30 between the inner annular surface 32 and the outer annular surface 34 is equal in width, and the thickness of the outward expansion section T2 of the jig 30 between the inner annular surface 32 and the outer annular surface 34 increases toward the trailing edge 30b. In other words, the section of the outer annular surface 34 of the jig 30 corresponding to the outward expansion section T2 is an inclined surface. Figure 5 It can be seen that a virtual reference line L2 is defined extending along the aforementioned inclined surface, and the reference line L2 intersects the axis L1 to form an angle θ, which is between 2 and 15 degrees, preferably between 4 and 10 degrees, with 4 degrees being the best.

[0043] Furthermore, the outer annular surface 34 of the jig 30 is modified into an arc surface at the front edge 30a, and the centerline average roughness (Ra) of the outer annular surface 34 is less than 1.6 μm, preferably between 0.2 and 0.8 μm, so that the outer annular surface 34 approaches a smooth surface. In addition, the axial hole 36 of the jig 30 is composed of an adjacent small-diameter hole section 36a and a large-diameter hole section 36b, wherein the small-diameter hole section 36a is formed correspondingly at the connecting section T1 and the outward expansion section T2, and the large-diameter hole section 36b is formed correspondingly at the sleeve section T3, and the aperture D1 of the small-diameter hole section 36a is smaller than the aperture D2 of the large-diameter hole section 36b, as shown in FIG. Figure 4 As shown, the fixture 30 is formed with a shoulder portion 38 at the connection portion between the small-diameter hole segment 36 a and the large-diameter hole segment.

[0044] The above is a detailed description of the structural features of the fixture 30. Next, its application method is described. It is worth noting that before the piston oil seal 10 is installed, the lip edge of the rubber sealing lip 14 has a diameter larger than the outer diameter of the fixture 30 at the connecting section T1, but smaller than the outer diameter of the fixture 30 at the sleeve section T3. Figures 6 to 10The disclosure is used to explain how the piston oil seal 10 is installed to the shaft tube 22 of the clutch housing 20 through the fixture 30. Among them:

[0045] Figure 6 It is disclosed that the jig 30 is aligned and its rear edge 30b faces the clutch housing 20;

[0046] Figure 7 The jig 30 is disclosed to be sleeved with the top of the shaft tube 22 by the large diameter hole section 36b of the shaft hole 36. When the shoulder section 38 abuts against the top edge of the shaft tube 22, it indicates that the jig 30 has completed the alignment with the clutch housing 20. At this time, the outer annular surface 34 of the jig 30 corresponding to the sleeve section T3 is roughly flush with the outer peripheral surface of the shaft tube 22.

[0047] Figure 8 It is disclosed that the piston oil seal 10 is moved toward the clutch housing 20, and the mounting hole 12 thereof is aligned with the front edge 30a of the fixture 30. Since the diameter of the lip edge of the rubber seal 14 is larger than the outer diameter of the fixture 30 at the connecting section T1, and the front edge 30a of the fixture 30 is modified with an arc surface, the piston oil seal 10 can be smoothly sleeved on the connecting section T1 of the fixture 30.

[0048] Fig. 9 The piston oil seal 10 is pushed toward the clutch housing 20. Due to the smooth surface (Ra less than 1.6 μm) of the outer ring surface 34 of the jig 30 and the design of the jig 30 with a gradually increasing outer diameter at the outer expansion section T2, the piston oil seal 10 can stably move toward the bottom of the jig 30 while its rubber sealing lip 14 is squeezed and deformed;

[0049] Fig.10 It is revealed that when the piston oil seal 10 moves to the bottom of the fixture 30, the fixture 30 is pulled away from the clutch housing 20, so that the rubber sealing lip 14 can be pressed against the peripheral surface of the root of the shaft tube 22, thereby completing the purpose of installing the piston oil seal 10 to the clutch housing 20.

[0050] It can be known from the above description that the jig 30 is first sleeved on the top of the shaft tube 22, which not only provides a guide for the installation operation of the piston oil seal 10, but also prevents the rubber sealing lip 14 from being improperly deformed or broken due to excessive pushing when the rubber sealing lip 14 directly contacts the top edge of the shaft tube 22. In particular, when the top edge of the shaft tube 22 is not chamfered, the jig 30 provides an isolation effect for the rubber sealing lip 14 to ensure that the rubber sealing lip 14 will not be scratched or torn during the installation process, and further ensures that the hydraulic chamber formed between the piston oil seal 10 and the clutch housing 20 can have a good sealing effect.

[0051] The above description is only the preferred embodiment of the present utility model. Any equivalent changes made by applying the present utility model specification and the scope of patent application should be included in the patent scope of the present utility model.

Claims

1. A jig is used to install a piston oil seal on a clutch housing, wherein the piston oil seal has a mounting hole, and a rubber sealing lip is arranged around the mounting hole, and the clutch housing has a shaft tube; characterized in that: The jig is a cylindrical body having an inner annular surface and an outer annular surface, and a virtual axis is defined passing through the center of the jig, and a virtual reference line is defined extending along the outer annular surface, the reference line intersects with the axis to form an angle, and the angle is between 2 and 15 degrees; thereby, the jig is sleeved on the shaft tube, the piston oil seal is sleeved on the jig with its mounting hole and slides to the bottom of the jig, and after the jig is withdrawn from the clutch housing, the rubber sealing lip abuts against the circumferential surface of the shaft tube.

2. The fixture according to claim 1, characterized in that: The jig has a front edge and a rear edge located at opposite ends, and the jig is divided into a connecting section, an outward expansion section and a sleeve section in the extension direction of the axis, the connecting section is close to the front edge, the sleeve section is close to the rear edge, and the outward expansion section is located between the connecting section and the sleeve section; the thickness of the connecting section of the jig between the inner annular surface and the outer annular surface is equal in width, the thickness of the outward expansion section of the jig between the inner annular surface and the outer annular surface increases toward the rear edge, and the reference line is extended along the outer annular surface of the outward expansion section.

3. The fixture according to claim 2, characterized in that: The space enclosed by the inner annular surface constitutes an axial hole, the axis passes through the center of the axial hole, the axial hole has a small-diameter hole section and a large-diameter hole section adjacent to each other, the small-diameter hole section is formed correspondingly at the connecting section and the outward expansion section, the large-diameter hole section is formed correspondingly at the sleeve section, and the aperture of the small-diameter hole section is smaller than the aperture of the large-diameter hole section; the fixture is sleeved on the shaft tube by the large-diameter hole section of its axial hole.

4. The jig according to claim 2 or 3, characterized in that: The outer annular surface of the fixture is provided with a curved surface at the front edge.

5. The fixture according to claim 1, characterized in that: The angle is between 4 and 10 degrees.

6. The fixture according to claim 1, characterized in that: The centerline average roughness (Ra) of the outer annular surface of the fixture is less than 1.6 μm.

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