Test fixture for rotary oil seal testing machine

Abstract

The utility model provides a test fixture for a rotary oil seal testing machine, which can simply enable the axis of a rotating shaft to be eccentric. A test jig (40) for a rotary oil seal testing machine (1), the test jig (40) comprising: a main body (21) capable of rotating about an axis (x1); a hole (12) defined about the axis (x1); and a rotating shaft (22) connected to the main body (21) and in contact with an annular oil seal (50) supported in the hole (12) in a relatively rotatable manner. The test jig (40) supports the rotating shaft (22) and the main body (21) such that the axis (x3) of the rotating shaft (22) is eccentric from the axis (x1).

Description

Technical Field

[0001] The utility model relates to a test fixture for a rotary oil seal testing machine. Background Art

[0002] In the past, a sealing device, i.e., an oil seal, was used to seal a rotating shaft rotating around an axis of a vehicle, general-purpose machinery, etc., and a through hole of a housing into which the rotating shaft is inserted. For example, a rotary oil seal tester is used to perform various functional tests of the oil seal at a specific shaft eccentricity. Utility Model Content

[0003] Problems to be solved by utility models

[0004] The rotating shaft, for example, includes a rotating shaft body that rotates around an axis and a cylindrical member that can be eccentrically mounted relative to the rotating shaft body. The axis of the cylindrical member is eccentric relative to the axis by a predetermined axis eccentricity, for example, by manual operation such as hitting with a hammer. An oil seal is mounted on the outer peripheral surface of the cylindrical member. A functional test is performed in this state. However, the setting of the axis eccentricity by manual operation is cumbersome and inefficient.

[0005] The utility model is completed in view of the above-mentioned problem, and its object is to provide a test fixture for a rotary oil seal testing machine which can easily eccentric the axis center of a rotating shaft.

[0006] Means used to solve problems

[0007] In order to achieve the above-mentioned purpose, the test fixture for a rotary oil seal testing machine of the utility model includes: a main body, which can rotate around an axis; a hole, which is defined around the axis; and a rotating shaft, which is connected to the main body and contacts with an annular oil seal supported in the hole in a relatively rotatable manner, and the test fixture is constructed to support the rotating shaft and the main body so that the axis of the rotating shaft is eccentric from the axis.

[0008] The test jig for the rotary oil seal tester of the present invention includes: a first axis supported by the main body and defining a first axis; and a second axis supported by the rotating shaft and defining a second axis, wherein the second axis is eccentric with respect to the first axis.

[0009] In the test jig for a rotary oil seal testing machine of the present invention, the first portion is supported in a first hole formed in the main body, and the second portion is supported in a second hole formed in the rotating shaft.

[0010] In the test fixture for the rotary oil seal testing machine of the utility model, the central axis of the first hole is consistent with the axis.

[0011] In addition, the rotary oil seal testing machine of the utility model includes: a main body, which can rotate around an axis; a hole, which is defined around the axis; a rotating shaft, which is connected to the main body and contacts with an annular oil seal supported in the hole in a relatively rotatable manner; and a test fixture, which is configured to support the rotating shaft and the main body so that the axis of the rotating shaft is eccentric from the axis.

[0012] Effect of utility model

[0013] According to the present invention, a test jig for a rotary oil seal testing machine can be provided, which can easily decenter the axis of a rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view schematically showing a part of the structure of a rotary oil seal testing machine 1 according to one embodiment of the present invention.

[0015] Figure 2 This is a partially enlarged cross-sectional view showing a part of the main body 21 and the rotating shaft 22 in a partially enlarged manner.

[0016] Figure 3 It is a cross-sectional perspective view schematically showing the structure of a test jig 40 according to a specific example.

[0017] Figure 4 1 is a cross-sectional view showing a state where the annular oil seal 50 is installed in the hole 12 of the housing 11 of the rotary oil seal testing machine 1 .

[0018] Reference numerals:

[0019] 1 Rotary oil seal tester, 10 first component, 11 housing, 12 hole, 13 first surface, 14 second surface, 15 inner peripheral surface, 20 second component, 21 main body, 22 rotating shaft, 23 cylindrical portion, 24 protruding portion, 25 through hole, 26 end surface, 27 first hole, 28 mounting hole, 28a large diameter portion, 28b small diameter portion, 29 shaft portion, 30 flange portion, 31 end surface, 32 outer peripheral surface, 33 second hole, 34 through hole, 35 fixing component, 36 head, 37 threaded portion, 40 test fixture, 41 first portion, 42 second portion, 50 oil seal, 51 reinforcement ring, 52 elastic body portion, 53 sealing lip, 54 dustproof lip, 55 lip waist portion, 56 lip front end portion, 57 spring, 58 side cover, A eccentricity, G clearance, x1 center axis, x2 axis, x3 axis center, x4 axis center, x5 axis center. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a cross-sectional view schematically showing a part of the structure of a rotary oil seal testing machine 1 according to one embodiment of the present invention. Figure 1 In the figure, only the part where the oil seal is installed in the rotary oil seal tester 1 is shown. The rotary oil seal tester 1 is a sealing device that realizes the sealing between the rotating shaft and the hole for inserting the rotating shaft, that is, a device capable of performing the performance test of the oil seal. The oil seal is used, for example, to seal between the rotating shaft rotating around the axis of a vehicle, general machinery, etc. and the through hole of the housing for inserting the rotating shaft. However, the application of the oil seal is not limited to this specific example, and the oil seal can be applied to various machines, devices, mechanisms, etc.

[0021] The rotary oil seal testing machine 1 includes a first component 10 and a second component 20 that is relatively rotatable relative to the first component 10. The first component 10 includes, for example, a housing 11. A hole 12 is formed in the housing 11. In this example, the housing 11 is shown as a wall having a first surface 13 and a second surface 14 oriented to the first surface 13. The hole 12 is a through hole that passes from the first surface 13 to the second surface 14 of the housing 11. The hole 12 defines a cylindrical space having a central axis x1. The inner peripheral surface 15 of the hole 12 is defined by a cylindrical surface centered on the central axis x1.

[0022] The second component 20 has a main body 21 and a rotating shaft 22 connected to the main body 21 in a detachable manner. The main body 21 can rotate around an axis x2 that coincides with the central axis x1 of the hole 12. The main body 21 has, for example: a cylindrical portion 23 that is roughly cylindrical and extends along the axis x2; and a protrusion 24 that protrudes in an annular shape from the outer peripheral surface of the cylindrical portion 23 at the other end side opposite to the one end connected to the rotating shaft 22. One or more through holes 25 are formed in the protrusion 24 parallel to the axis x2. The through hole 25 allows, for example, a fixing component (not shown) for mounting the main body 21 on a motor (not shown) that rotates the main body 21 to pass through. The main body 21 can rotate around the axis x2 by being driven by the motor.

[0023] An end face 26, for example, which is circular, is defined on the rotating shaft 22 side of the cylindrical portion 23. In this example, the end face 26 is defined along an imaginary plane orthogonal to the axis x2. The cylindrical portion 23 has a first hole 27 formed on the end face 26 along the axis x2 and one or more mounting holes 28 formed on the end face 26 parallel to the axis x2. The first hole 27 is, for example, a bottomed hole that defines a cylindrical space. The central axis of the first hole 27 coincides with the axis x2. In this example, four mounting holes 28, for example, are formed circumferentially around the first hole 27. The space defined by the mounting hole 28 has a cylindrical large diameter portion 28a and a roughly cylindrical small diameter portion 28b having a smaller diameter than the large diameter portion 28a. An internal thread is cut on the inner circumferential surface of the small diameter portion 28b. The mounting hole 28 is also a bottomed hole.

[0024] On the other hand, the rotating shaft 22 has a cylindrical shaft portion 29 extending from the base end to the front end along the axis x3 and a flange portion 30 protruding in an annular shape at the base end of the shaft portion 29 in a direction perpendicular to the axis x3. In this example, the shaft portion 29 is inserted into the hole 12 of the housing 11 and passes through the hole 12. A circular end face 31 is defined at the base end of the main body 21 side of the rotating shaft 22, for example. In this example, the end face 31 is defined along an imaginary plane perpendicular to the axis x3. When the rotating shaft 22 is connected to the main body 21, the end face 31 at least partially abuts against the end face 26 of the main body 21. The shaft portion 29 has a cylindrical outer peripheral surface 32 centered on the axis x3. The outer peripheral surface 32 is opposite to the inner peripheral surface 15 of the hole 12.

[0025] The rotating shaft 22 has a second hole 33 formed on the end face 31 along the axis x3. The second hole 33 is, for example, a bottomed hole that defines a cylindrical space. The central axis of the second hole 33 coincides with the axis x3. On the other hand, the flange portion 30 has one or more through holes 34 formed on the end face 31 around the axis x3. The through holes 34 penetrate the flange portion 30, for example, parallel to the axis x3. In this example, four through holes 34 are formed circumferentially around the second hole 33. The through holes 34 are, for example, through holes that define a cylindrical space. The through holes 34 are formed at a position corresponding to the mounting hole 28 of the cylindrical portion 23.

[0026] Figure 2 FIG. 2 is a partially enlarged cross-sectional view of a part of the main body 21 and the rotating shaft 22. Figure 2 As shown, the position of the rotating shaft 22 relative to the body 21 in a direction perpendicular to the central axis x1 of the hole 12 is determined by the test jig 40. Specifically, the eccentricity of the axis x3 of the rotating shaft 22 relative to the axis x2 of the body 21 is set by the test jig 40. Figure 3 1 is a cross-sectional perspective view schematically showing the structure of a test jig 40 according to a specific example. Figure 2 and Figure 3 The test jig 40 includes a first portion 41 supported by the first hole 27 of the body 21 and a second portion 42 supported by the second hole 33 of the rotating shaft 22. The first portion 41 and the second portion 42 are integrally formed of, for example, a metal material.

[0027] The first portion 41 and the second portion 42 both have a cylindrical shape. Figure 2It can be seen that in this example, the first portion 41 is completely accommodated in the first hole 27, and on the other hand, the second portion 42 is completely accommodated in the second hole 33. However, a predetermined gap may be formed between the end face 41a of the first portion 41 on the opposite side of the second portion 42 and the bottom face of the first hole 27. Similarly, a predetermined gap may be formed between the end face 42a of the second portion 42 on the opposite side of the first portion 41 and the bottom face of the second hole 33. On the other hand, the outer peripheral surface 41b of the first portion 41 abuts against the inner peripheral surface of the first hole 27, and the outer peripheral surface 42b of the second portion 42 abuts against the inner peripheral surface of the second hole 33. In this way, the first portion 41 is fitted into the first hole 27, and on the other hand, the second portion 42 is fitted into the second hole 33.

[0028] like Figure 3 As shown, in the test fixture 40, the axis x4 of the first part 41 and the axis x5 of the second part 42 are mutually eccentric with a predetermined eccentricity A in a direction orthogonal to the axis x4 and the axis x5. The eccentricity A is set, for example, in the range of 0.1 mm to 1.0 mm. In one example, 10 test fixtures 40 in which the eccentricity A is set to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm may be prepared. In this way, the axis x4 of the first part 41 of the test fixture 40 and the axis x5 of the second part 42 are mutually eccentric, whereby the rotating shaft 22 is positioned relative to the main body 21 in a state in which the axis x3 is eccentric from the axis x2.

[0029] The rotating shaft 22 eccentrically positioned relative to the main body 21 is fixed to the main body 21, for example, by one or more fixing members 35. In this example, the fixing members 35 are, for example, bolts. Each fixing member 35 has a head 36 and a threaded portion 37 extending from the head 36. The fixing member 35 is screwed into the small diameter portion 28b of the mounting hole 28 of the main body 21 through the through hole 34. A predetermined gap G is provided between the outer peripheral surface of the threaded portion 37 of the fixing member 35 and the inner peripheral surface of the through hole 34. The gap G is the sum of the radial dimensions between the outer peripheral surface of the threaded portion 37 and the inner peripheral surface of the through hole 34 defined on an imaginary plane including the central axis of the through hole 34. Even when the rotating shaft 22 is eccentric with respect to the main body 21 by an eccentricity A, the gap G allows the fixing member 35 to be screwed into the small diameter portion 28b of the mounting hole 28 through the through hole 34.

[0030] Hereinafter, a usage mode of the rotary oil seal testing machine 1 according to one embodiment of the present invention will be described. Figure 4It is a cross-sectional view showing a state in which an annular oil seal 50 is installed in the hole 12 of the housing 11 of the rotary oil seal testing machine 1. Specifically, the oil seal 50 is installed in the space between the inner peripheral surface 15 of the hole 12 of the housing 11 and the outer peripheral surface 32 of the shaft portion 29 of the rotating shaft 22 to seal the space. Here, the structure of the oil seal 50 involved in a specific example is briefly described. The oil seal 50 has an annular reinforcement ring 51 centered on the central axis x1 of the hole 12 and an elastomer portion 52 composed of an annular elastomer centered on the central axis x1. The elastomer portion 52 is integrally mounted on the reinforcement ring 51. The reinforcement ring 51 is formed, for example, of a metal material. The cross section of the reinforcement ring 51 has a substantially L-shaped shape.

[0031] The elastomer portion 52 is integrally formed with the reinforcement ring 51 in such a manner as to cover the reinforcement ring 51. The elastomer portion 52 has a sealing lip 53, a dustproof lip 54, and a lip waist portion 55. The sealing lip 53 has a wedge-shaped lip front end portion 56 that protrudes toward the inner peripheral side toward the center axis x1. On the outer peripheral side away from the center axis x1 of the sealing lip 53, a spring 57 is installed opposite to the lip front end portion 56. The spring 57 applies force to the lip front end portion 56 toward the outer peripheral surface 32 of the shaft portion 29. In addition, the dustproof lip 54 is a portion extending from the lip waist portion 55. The elastomer portion 52 has a side cover 58. When the oil seal 50 is pressed between the hole 12 and the shaft portion 29, the side cover 58 is compressed in the radial direction between the inner peripheral surface 15 of the hole 12 and the reinforcement ring 51.

[0032] In one example, a test fixture 40 with a predetermined eccentricity A is used in the rotary oil seal tester 1. As a result, the axis x3 of the rotating shaft 22 is eccentric with respect to the axis x2 of the main body 21 by the eccentricity A. When the motor is driven, the main body 21 and the rotating shaft 22 rotate around the axis x2. The rotating shaft portion 29 contacts the oil seal 50. For example, assuming that the portion closer to the second surface 14 of the housing 11 than the oil seal 50 is the atmospheric side where a sealed object such as oil does not exist, a predetermined pressure is applied to the oil seal 50. By maintaining this state while continuously driving the motor for a predetermined time, the tracking performance of the oil seal 50 relative to the outer peripheral surface 32 of the rotating shaft 22 is tested. As a result, the sealing and durability performance of the oil seal 50 are tested.

[0033] According to the rotary oil seal tester 1 as described above, the axis x3 of the rotating shaft 22 on which the oil seal 50 is installed is established in a state where the axis x3 is eccentric with respect to the axis x2 of the main body 21 by the eccentricity A. When establishing the eccentricity A, a test fixture 40 is used to eccentrically position the rotating shaft 22 and the main body 21. The eccentricity between the rotating shaft 22 and the main body 21 can be easily set by the test fixture 40 having a predetermined eccentricity A between the first part 41 and the second part 42. Therefore, the axis x3 of the rotating shaft 22 can be easily eccentric. There is no need to set the eccentricity by manual operation by hitting with a hammer or the like as in the past. In addition, by appropriately using a plurality of test fixtures 40 each of which is set with a predetermined eccentricity A, the eccentricity A of the rotating shaft 22 relative to the main body 21 can be easily set.

[0034] In such a rotary oil seal tester 1, the first part 41 and the second part 42 of the test fixture 40 both have a cylindrical shape, but the first part 41 and the second part 42 may have other shapes such as a prism shape. In addition, in the rotary oil seal tester 1, a test fixture 40 in which the axis x4 of the first part 41 and the axis x5 of the second part 42 are not eccentric to each other may be prepared. According to this test fixture 40, a performance test can also be performed when the eccentricity A is zero.

[0035] The present invention has been described above by the above-mentioned embodiments, but the technical scope of the present invention is not limited to the scope described in the above-mentioned embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above-mentioned embodiments. According to the description of the claims, the method to which such changes or improvements are made is also included in the technical scope of the present invention.

[0036] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the interpretation of the present invention. In addition, the above-described embodiments do not limit the objects of use of the present invention, and the present invention may include all schemes as its objects of use. The various components and their configurations, materials, conditions, shapes, and dimensions of the above-described embodiments are not limited to the illustrated contents and may be appropriately changed. For example, the present invention includes differences in the implementation of manufacturing tolerances, etc. In addition, within the scope of technical non-contradiction, the components shown in different embodiments may be partially replaced or combined with each other. In addition, the various structures may be selectively and appropriately combined to achieve at least a portion of the above-mentioned problems and effects.

Claims

1. A test fixture for a rotary oil seal testing machine, characterized in that: include: a body capable of rotating about an axis; a hole defined about said axis; as well as a rotating shaft connected to the main body and in contact with an annular oil seal supported in the hole so as to be relatively rotatable; The test jig is configured to support the rotating shaft and the main body so that the axis of the rotating shaft is eccentric from the axis line.

2. The test fixture for a rotary oil seal testing machine according to claim 1, characterized in that: have: A first portion supported by the main body and defining a first axis; and The second part is supported by the rotating shaft and defines a second axis. The second axis is eccentric relative to the first axis.

3. The test fixture for a rotary oil seal testing machine according to claim 2, characterized in that: The first portion is supported in a first hole formed in the body, The second portion is supported in a second hole formed in the rotating shaft.

4. The test fixture for a rotary oil seal testing machine according to claim 3, characterized in that: The central axis of the first hole is consistent with the axis.

5. A rotary oil seal testing machine, characterized in that: include: a body capable of rotating about an axis; a hole defined about said axis; a rotating shaft connected to the main body and in contact with an annular oil seal supported in the hole so as to be relatively rotatable; and The test jig is configured to support the rotating shaft and the main body so that the axis of the rotating shaft is eccentric from the axis line.

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