JP2002310820A - Partial tension force measuring device for oil seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a partial tension force measuring device for oil seal capable of precisely measuring the distribution of partial tension force of an oil seal. SOLUTION: This partial tension force measuring device for the oil seal 1 comprises a cylindrical thin plate 7 having the same outer diameter as a shaft, the outside surface of which abuts on the lip 1c of the oil seal, and a measuring means for measuring the distribution of partial tension force of the oil seal in the inside surface of the cylindrical thin plate 7. Accordingly, the distribution of partial tension force f of the oil seal can be precisely measured in the same state as when the shaft is actually inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a partial tightening force of an oil seal.

[0002]

2. Description of the Related Art Generally, the force with which an oil seal tightens the entire circumference of a shaft, that is, the tightening force around the entire circumference, is one of the values indicating the characteristics of the oil seal. It was measured by the all-around tension force measuring device shown in (b).

FIG. 10 is an explanatory view of a main part of an apparatus for measuring the entire circumference tension force of an oil seal, wherein (a) is a partial longitudinal sectional view,
(B) is a plan view.

[0004] Referring to FIG.
Consists of a main body 30a and a lip 30b extending from the main body 30a. A core member 32 is fitted on the inner peripheral portion of the main body 30a. The lip portion 30b has a lip 30c that slides on the shaft at an inner peripheral portion thereof, and a ring-shaped spring 31 is fitted on a corresponding outer peripheral portion of the lip 30c. The ring-shaped spring 31 tightens the oil seal 30 so that the lip 30c exerts a tightening force when the oil seal 30 is mounted on a shaft.

[0005] Such an apparatus for measuring the entire circumferential tension of the oil seal 30 includes a base 33, a load cell 34 as a load cell fixed on the base 33, and a two-part cylindrical body fixed to the base 33. One of the members 35a is fixed to the load cell 34, and the other member 35b of the two divided bodies of the cylindrical body. Member 35a and member 35b
Constitutes a shaft, which has the same outer diameter as the shaft on which the oil seal 30 is to be mounted.

[0006] When the oil seal 30 is mounted on a pseudo shaft composed of the above-mentioned members 35a and 35b, the force F by which the oil seal 30 tightens the shaft is shown in FIG.
As shown in (b), by applying a force F to the load cell 34 and measuring the force F with the load cell 34, the entire circumferential tension πF of the oil seal 30 can be obtained.

On the other hand, it is known that the force with which the oil seal 30 actually tightens the shaft varies in the circumferential direction of the oil seal 30. Knowing the circumferential portion where the shaft tightening force of the oil seal 30 fluctuates can be determined by using the lip 30.
It is considered useful for predicting uneven wear of c. The shaft tightening force at the circumferential portion of the oil seal 30 is called a partial tension, and a measuring device for the partial tension is
For example, KOYO Engineering Journal No. 1
58 (published by Koyo Seiki Co., Ltd.).
This measuring device is shown in FIGS. 11 (a) and 11 (b).

FIGS. 11A and 11B are explanatory views of a main part of a conventional device for measuring a partial tension force of an oil seal. FIG. 11A is a partial vertical sectional view, and FIG. 11B is a partial plan view.

In FIG. 11A, an oil seal 40 is shown.
Comprises a main body 40a and a lip 40b extending from the main body 40a. A core member 42 is fitted on the inner peripheral portion of the main body 40a. The lip portion 40b has a lip 40c that slides on the shaft at an inner peripheral portion thereof, and a ring-shaped spring 41 is fitted on a corresponding outer peripheral portion of the lip 40c.

Such a device for measuring the partial tension of the oil seal 40 includes a base 43, a bearing 44 fixed on the base 43, and a bearing 44 mounted on the bearing 44. A cylindrical housing 45 held on the surface, a load cell 47 fixed on the base 43 and serving as a load cell having a sensor section 46, and a lip 40 c of the oil seal 40 fixed to the sensor section 46. A pin 48 that contacts at a predetermined circumferential position.

The housing 45 is rotated at a low speed by a pulse motor (not shown) controlled by a computer, whereby the oil seal 40 is rotated. This oil seal 4
With the rotation of 0, a partial tension f acts on the pin 48 from the lip 40c of the oil seal 40 at a circumferential position of the lip 40c (FIG. 11B), and the distribution of the partial tension f is determined by the load cell. Measure at 47. FIG. 12 shows the measurement results.

[0012]

However, in the above-described measuring device, the pin 48 bites into the lip 40c at the time of measuring the partial tension force f (FIG. 13 (a)). It cannot be said that the state of FIG.

When the oil seal 40 is rotated with the pin 48 biting into the lip 40c, the pin 4
No. 8 cannot accurately measure the distribution of the partial tension force f of the lip 40c because it receives the dragged force from the lip 40c.

An object of the present invention is to provide an apparatus for measuring the partial tension of an oil seal which can accurately measure the distribution of the partial tension of the oil seal.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, there is provided an apparatus for measuring a partial tension force of an oil seal having a rotatable housing for holding an oil seal to be mounted on a shaft. A cylindrical member whose outer peripheral surface is in contact with the lip of the oil seal, and measuring means for measuring the distribution of the partial tightening force of the oil seal on the inner peripheral surface of the cylindrical member.

According to the first aspect of the present invention, the lip of the oil seal comes into contact with the outer peripheral surface of the cylindrical member. Therefore, the radius of curvature of the lip of the oil seal is limited by the outer diameter of the cylindrical member. It is almost the same as the state of being mounted on the shaft, and in addition, the oil seal does not undulate before and after the deflection measurement position, so that it can be caught and the like,
Thus, the distribution of the partial tension of the oil seal can be accurately measured in a state close to the time of actual use.

Preferably, the cylindrical member is formed of a cylindrical thin plate, and the measuring means is provided with a measuring element which is in contact with the inner peripheral surface of the cylindrical thin plate, and the tip of the measuring element may be formed of a knife edge member. , L-shaped pins. Thus, since the width of the tip of the tracing stylus is narrow in the circumferential direction of the oil seal, the partial tightening force of the oil seal can be measured precisely and precisely.

[0018] Preferably, the cylindrical member is formed of a cylindrical thin plate, and the cylindrical thin plate has a slit in the circumferential direction. As a result, the cylindrical thin plate is easily bent inward, and the partial tension of the oil seal can be measured more accurately.

Preferably, the cylindrical member is made of a cylindrical thin plate, and the measuring means is made of a strain gauge attached to the inner peripheral surface of the cylindrical thin plate. Thereby, the partial tension of the oil seal applied to the cylindrical thin plate can be measured by the strain gauge, and the measuring device for the partial tension of the oil seal can be further simplified and downsized.

[0020] Preferably, the cylindrical member is formed of a cylindrical thin plate, and the cylindrical thin plate has a pair of slits on both sides of the probe in the circumferential direction. This makes it easier for the portion sandwiched between the pair of slits to bend into the inside of the cylindrical thin plate, so that the partial tension of the oil seal can be measured more accurately.

[0021] Preferably, the cylindrical member is formed of a cylindrical thick plate, and the cylindrical thick plate is preferably thin in the circumferential direction in the vicinity of the measuring element. Thus, unlike a cylindrical thin plate formed by a thin plate on the entire circumference, the oil seal can be inserted without bending the cylindrical thick plate.

Preferably, the cylindrical member includes a cylindrical thin plate,
A cylindrical thick plate fitted inside the cylindrical thin plate,
It is preferable that a part of the cylindrical thick plate be cut off in the vicinity of the probe in the circumferential direction.
This eliminates the need for machining the inner peripheral surface of the cylindrical thick plate, which facilitates its manufacture.

Preferably, the cylindrical member is formed of a cylindrical thick plate, and the cylindrical thick plate is partially cut away in the circumferential direction in the vicinity of the probe, and the cut-out portion is formed. It is preferable that a slidable contact is disposed on the rim. Thus, only the contact that can move independently of the cylindrical thick plate receives a load due to the partial tension of the oil seal, and the partial tension of the oil seal can be measured more accurately.

Preferably, the measuring means includes a measuring element comprising an L-shaped contact pin and a plurality of L-shaped support pins arranged on both sides in parallel with the L-shaped contact pin. Thereby, the lip of the oil seal can be regulated to an arbitrary radius of curvature, and the partial tightening force of the oil seal can be measured without manufacturing a cylindrical thin plate for each shaft having a different shaft diameter.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for measuring a partial tightening force of an oil seal according to an embodiment of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is an explanatory view of a main part of an apparatus for measuring a partial tightening force of an oil seal according to a first embodiment of the present invention, and FIG. It is a figure and (b) is a partial perspective view.

In FIG. 1A, an oil seal 1 is
It comprises a main body 1a and a lip 1b extending from the main body 1a. A core member 3 is fitted on the inner peripheral portion of the main body 1a. The lip portion 1b has a lip 1c on its inner periphery in sliding contact with the shaft, and a ring-shaped spring 2 is fitted on a corresponding outer periphery of the lip 1c. The ring-shaped spring 2 tightens the oil seal 1 so that the lip 1c exerts a tightening force when the oil seal 1 is mounted on a shaft.

The device for measuring the partial tension of the oil seal 1 comprises a stepped base 4 comprising a disc-shaped central upper step 4a and a disc-shaped peripheral lower step 4b which are coaxially arranged, and a peripheral lower step. Bearing 5 coaxially fixed on 4b
And a cylindrical housing 6 coaxially mounted on the bearing 5 and holding the oil seal 1 on its inner peripheral surface.
And a thin-plate cylindrical thin plate 7 externally fitted to the central upper step 4a.
(Cylindrical member).

The cylindrical thin plate 7 has a height of the upper central portion 4.
and reaches the lip 1c of the oil seal 1 higher than a, and the outer dimensions are equal to the diameter of the shaft to which the oil seal 1 is to be mounted. As a result, the lip 1c of the oil seal 1 held by the housing 6 applies a predetermined tightening force to the outer peripheral surface of the cylindrical thin plate 7. The cylindrical thin plate 7 has such a rigidity that it is deflected by the tightening force to reduce its inner diameter.

The measuring device further includes a load cell 8 (measuring means) as a load cell fixed on the central upper stage 4a.
And a tracing stylus 9 (measuring means) fixed to the load cell 8 and having a tip abutting on the inner peripheral surface of the cylindrical thin plate 7 (FIG. 1).
(B)). The tip of the tracing stylus 9 has a knife edge shape extending in the vertical direction, and cooperates with the lip 1c of the oil seal 1 to sandwich the cylindrical thin plate 7.

The housing 6 is rotated at a low speed by a pulse motor (not shown) controlled by a computer, whereby the oil seal 1 is rotated. With the rotation of the oil seal 1, the load on the cylindrical thin plate 7 at the circumferential position of the oil seal 1 is measured by the measuring element 9 and the load cell 8.
The distribution of the partial tension force f can be measured over the entire circumference of the oil seal 1 by the measurement.

According to the present embodiment, the radius of curvature of the lip 1c of the oil seal 1 mounted on the cylindrical thin plate 7 is regulated by the outer diameter of the cylindrical thin plate 7, so that the oil seal 1 is mounted on the actual shaft. In addition, since the lip 1c of the oil seal 1 does not undulate before and after the tracing stylus 9 and there is no snagging or the like, the partial tension f Can be accurately measured.

The cylindrical thin plate 7 is preferably made of an elastic material such as a steel plate, an aluminum plate, a plastic plate or the like, but may be made of another material as long as it is bent by the partial tightening force f of the oil seal 1. The thickness of the cylindrical thin plate 7 is preferably about 0.1 to 1 mm. Also, PTF is provided on the surface of the cylindrical thin plate 7.
The surface may be coated with E (Poly Tetra Fluoro Ethylene) or boron nitride, or may be subjected to surface treatment such as caniflon plating or Nidax to enhance the slidability with the lip 1c. As a result, the tracing stylus 9 is
c can be effectively prevented from being dragged. In particular, when the cylindrical thin plate 7 is an aluminum plate, it is preferable that the surface thereof be subjected to a tuffram treatment.

FIG. 2A is a partial plan view of the probe 9 in FIG. 1, and FIG. 2B is a plan view of the probe 9 in FIG.
FIG. 2C is a perspective view of the load cell 8 and the tracing stylus 10 of FIG. 2B.

In FIG. 2A, the tip of the tracing stylus 9 has a knife-edge shape, and the width of the tip is narrow in the circumferential direction of the oil seal 1.
Can be measured precisely and precisely. The radius of curvature of the tip of the tracing stylus 9 is preferably about R0.3 to R5.

The tip of the tracing stylus 9 may be, for example, an L-shaped pin 10 as shown in FIGS. 2B and 2C in addition to the knife edge. The outer diameter of the pin 10 is preferably about 0.5 to 10 mmφ.

Further, as shown in FIG.
Has a pair of diametrically opposed vertical slits 11a
May be provided. As a result, the cylindrical thin plate 7 is easily bent inward, and the partial tension force f of the oil seal 1 can be measured more accurately. The width of these slits 11a is preferably about 0.5 to 5 mm.

(Second Embodiment) A measuring apparatus according to a second embodiment of the present invention has the basic configuration described in the first embodiment.
This embodiment is the same as that of the first embodiment, the description thereof will be omitted, and only the points different from the first embodiment will be described. This is the same in the following embodiments.

FIGS. 4A and 4B are explanatory views of a first modification of the cylindrical member in FIG. 1, wherein FIG. 4A is a perspective view and FIG. 4B is a plan view.

In FIG. 4A, a strain gauge 12 is attached to the inner peripheral surface of the cylindrical thin plate 7 in place of the tracing stylus 9 and the load cell 8 in the first embodiment. Using this strain gauge 12, the oil seal 1
Of the partial tension force f is measured. That is, when the oil seal 1 is inserted into the cylindrical thin plate 7, a partial tension force f of the oil seal 1 against the cylindrical thin plate 7 is applied, the cylindrical thin plate 7 is bent, and the change is connected to the strain gauge 12. It is read by a measuring device (not shown), and the partial tightening force f of the oil seal is measured.

According to the second embodiment, since the strain gauge 12 is adhered to the inner peripheral surface of the cylindrical thin plate 7, the partial tightening force f of the oil seal 1 applied to the cylindrical thin plate 7 is reduced. The measurement can be performed by the gauge 12, and the measuring device of the partial tension force f of the oil seal can be further simplified and downsized.

(Third Embodiment) FIGS. 5A and 5B are explanatory views of a second modification of the cylindrical member in FIG. 1, wherein FIG. 5A is a perspective view and FIG. 5B is a plan view.

In FIG. 5A, in the third embodiment, a cylindrical thin plate 13 is used in place of the cylindrical thin plate 7 in the first embodiment. The cylindrical thin plate 13 has a pair of slits 13 on both sides of the probe 9 in the circumferential direction.
a. The bent piece 13b of the portion sandwiched between the pair of slits 13a is easily bent toward the inside of the cylindrical thin plate 13. The tip of the tracing stylus 9 fixed to the load cell 8 is in contact with the inner peripheral surface of the bending piece 13b. In the present embodiment, the bending piece 13 b receives a load due to the partial tension force f of the oil seal 1, and the load is measured by the tracing stylus 9 and the load cell 8 to measure the partial tension force f of the oil seal 1.

In FIG. 5B, a pair of slits 13 are formed.
The width W of a is preferably about 1 to 10 mm,
Beyond this range, the bending piece 13b may not be easily bent due to the influence of the arc shape of the bending piece 13b, and the measurement sensitivity may be reduced.

According to the third embodiment, since the cylindrical thin plate 13 has the pair of slits 13a on both sides of the tracing stylus 9 in the circumferential direction, the pair of slits 13a
The bending piece 13b of the portion sandwiched between the elastic seals 13 is easily bent to the inside of the cylindrical thin plate 13, and the partial tension force f of the oil seal 1 can be measured more accurately.

(Fourth Embodiment) FIGS. 6A and 6B are explanatory views of a third modification of the cylindrical member in FIG. 1, wherein FIG. 6A is a perspective view and FIG. 6B is a plan view.

In FIG. 6A, in the fourth embodiment, a cylindrical thick plate 14 having a predetermined thickness is used in place of the cylindrical thin plate 7 in the first embodiment. The cylindrical thick plate 14 has rigidity that does not bend due to the partial tension force f of the oil seal 1, but has a thin plate portion 14 a having an increased inner diameter near the tracing stylus 9 in the circumferential direction. The thin plate portion 14a is provided with a partial tightening force f of the oil seal 1.
Makes it easy to bend inward. The tip of the tracing stylus 9 fixed to the load cell 7 is in contact with the inner peripheral surface of the thin plate portion 14a. In the present embodiment, the thin plate portion 14a receives a load due to the partial tension force f of the oil seal 1, and the load is measured by the tracing stylus 9 and the load cell 8, thereby measuring the partial tension force f of the oil seal 1.

In FIG. 6B, the width X of the thin plate portion 14a is shown.
Is preferably about 10 to 100 mm, and if it exceeds this range, the thin plate portion 14a may not be easily bent due to the influence of the arc shape of the thin plate portion 14a, and the measurement sensitivity may be reduced. Further, the thickness of the thin plate portion 14a is preferably about 0.01 to 1 mm.

According to the fourth embodiment, since the cylindrical thick plate 14 has the thin plate portion 14a having a small thickness in the vicinity of the tracing stylus 9 in the circumferential direction, the entire circumference is formed of a thin plate. Unlike the cylindrical thin plate 7, the oil seal 1 can be mounted without bending the cylindrical thick plate.

(Fifth Embodiment) FIGS. 7A and 7B are explanatory views of a fourth modification of the cylindrical member in FIG. 1, wherein FIG. 7A is a perspective view and FIG. 7B is a plan view.

In FIG. 7 (a), in the fifth embodiment, in addition to the cylindrical thin plate 7 in the first embodiment, a predetermined thickness is fitted inside the cylindrical thin plate 7. Is used. The cylindrical thick plate 15 has rigidity that does not bend due to the partial tension force f of the oil seal 1. Further, the cylindrical thick plate 15 has a cutout portion 15a cut out from the upper end surface side in the vicinity of the tracing stylus 9 in the circumferential direction. The tip of the tracing stylus 9 has a notch 15a
Through the inner peripheral surface of the cylindrical thin plate 7. In the present embodiment, the cylindrical thin plate 7 receives a load due to the partial tension force f of the oil seal 1, and the partial tension force f of the oil seal 1 is measured by measuring the load with the tracing stylus 9 and the load cell 8.

In FIG. 7B, the width X of the notch 15a is preferably set to be equal to the width X of the thin plate portion 14a in the fourth embodiment.

According to the fifth embodiment, the cylindrical thick plate 15 having the notch 15a near the tracing stylus 9 in the circumferential direction is fitted in the cylindrical thin plate 7, so that the cylindrical thin plate 7 is fitted. The processing of shaving the inner peripheral surface of the thick plate is not required, and the manufacture is facilitated.

(Sixth Embodiment) FIGS. 8A and 8B are explanatory views of a fifth modification of the cylindrical member in FIG. 1, wherein FIG. 8A is a perspective view, FIG. 8B is a plan view, and FIG. FIG.

Referring to FIG. 8A, in the sixth embodiment, a cylindrical thick plate 16 having a predetermined thickness is used instead of the cylindrical thin plate 7 in the first embodiment. The cylindrical thick plate 16 has a cutout portion 16a cut out from the upper end surface side near the contact 17 in the circumferential direction. Further, a contact 17 having a width slightly smaller than the notch 16a is fixed to the load cell 8 in FIG. The contact 17 is slidably disposed in the notch 16a. The contact 17 forms a part of the outer peripheral surface of the cylindrical thick plate 16, and the radius of curvature of the outer peripheral surface is equal to the radius of curvature of the cylindrical thick plate 16. In the present embodiment, the contact 17 is loaded by the partial tension force f of the oil seal 1, and the load is measured by the load cell 8 to measure the partial tension force f of the oil seal 1.

8 (b) and 8 (c), the width Y of the contact 17 is preferably about 1 to 10 mm, and if it exceeds this range, the pressure receiving area increases, so that the partial tension force f cannot be measured finely. .

According to the sixth embodiment, since the cylindrical thick plate 16 has the slidable contact 17 in the notch 16a, the contact movable independently of the cylindrical thick plate 16 is provided. Only 17 receives a load due to the partial tension of the oil seal 1, and the partial tension f of the oil seal 1 can be measured more accurately.

(Seventh Embodiment) FIG.
FIG. 9B is a perspective view of a modification of the measuring means in FIG.
FIG. 9A is a plan view of FIG. 9A, and FIG. 9C is a plan view of another modification of the measuring means in FIG.

In FIG. 9A, in the seventh embodiment, an L-shaped contact pin 18 is used in place of the tracing stylus 9 in the first embodiment. One L-shaped support pin 19 is disposed on each side of the L-shaped contact pin 18. In this case, the cylindrical thin plate 7 in the first embodiment is not used. L-shaped support pin 19
Are supported by bearings 20. The L-shaped support pins 19 such that the radius of curvature formed by the contact points of the L-shaped contact pins 18 and the L-shaped support pins 19, 19 with the oil seal 1 are equal to the shaft diameter of the oil seal 1. , 19 are adjusted. The outer dimensions of the L-shaped contact pin 18 and the L-shaped support pin 19 are preferably about 1 to 10 mmφ. In the present embodiment, the L-shaped contact pin 18 receives a load due to the partial tension f of the oil seal 1, and the load is measured by the load cell 8 to measure the partial tension f of the oil seal 1.

According to the seventh embodiment, since the L-shaped support pin 19 whose position can be adjusted is provided, the lip 1c of the oil seal 1 can be restricted to an arbitrary radius of curvature, and the shaft diameter can be reduced. The partial tightening force f of the oil seal 1 can be measured without manufacturing the cylindrical thin plate 7 for each different shaft.

As shown in FIG. 9C, two L-shaped support pins 19 may be arranged on each side of the L-shaped contact pin 18. Accordingly, the radius of curvature of the lip 1c can be restricted to a wide circumferential angle, and the partial tension force f of the oil seal 1 can be measured more finely.

[0062]

As described above in detail, according to the first aspect of the present invention, since the lip of the oil seal abuts on the outer peripheral surface of the cylindrical member, the radius of curvature of the lip of the oil seal is reduced. Due to the regulation by the outer diameter, it becomes almost equal to the state where the oil seal is mounted on the actual shaft, and in addition, the oil seal does not undulate before and after the deflection measurement position,
It is possible to prevent the oil seal from being caught and to accurately measure the partial tension force f of the oil seal in a state close to the time of actual use.

[Brief description of the drawings]

FIG. 1A is an explanatory view of a main part of a partial tension force measuring device for an oil seal according to a first embodiment of the present invention, FIG. 1A is a partial cross-sectional view, and FIG. (b) is a partial perspective view.

2 (a) is a partial plan view of a tracing stylus 9 in FIG. 1, and FIG. 2 (b) is a partial plan view of a modification of the tracing stylus 9 in FIG. FIG. 2C is a perspective view of the load cell 8 and the tracing stylus 10 of FIG.

FIG. 3 is a perspective view showing a modified example of the cylindrical thin plate 7 in FIG.

4A and 4B are explanatory views of a first modification of the cylindrical member in FIG. 1, wherein FIG. 4A is a perspective view and FIG. 4B is a plan view.

5A and 5B are explanatory views of a second modified example of the cylindrical member in FIG. 1, wherein FIG. 5A is a perspective view and FIG. 5B is a plan view.

FIGS. 6A and 6B are explanatory views of a third modification of the cylindrical member in FIG. 1, wherein FIG. 6A is a perspective view and FIG. 6B is a plan view.

FIGS. 7A and 7B are explanatory views of a fourth modification of the cylindrical member in FIG. 1, in which FIG. 7A is a perspective view and FIG. 7B is a plan view.

FIGS. 8A and 8B are explanatory views of a fifth modification of the cylindrical member in FIG. 1, wherein FIG. 8A is a perspective view, FIG. 8B is a plan view, and FIG.

9 (a) is a perspective view of a modification of the measuring means in FIG. 1, FIG. 9 (b) is a plan view of FIG. 9 (a), and FIG. FIG. 9 is a plan view of another modification of the measuring means in FIG. 1.

FIGS. 10A and 10B are explanatory views of a main part of an apparatus for measuring an all-around tension force of an oil seal, in which FIG. 10A is a partial longitudinal sectional view and FIG. 10B is a plan view.

11A and 11B are explanatory views of a main part of a conventional device for measuring partial tension of an oil seal, in which FIG. 11A is a partial longitudinal sectional view, and FIG.
Is a partial plan view.

12 is a diagram showing a distribution of a partial tension force of the oil seal 40 measured by the measuring device of FIG.

13A and 13B are explanatory diagrams of a state of a lip of an oil seal at the time of measuring partial tension, wherein FIG. 13A shows a state at the time of measurement by the measuring device of FIG. 11, and FIG. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil seal 1c Lip 4 Base 6 Housing 7 Cylindrical thin plate 8 Load cell 9 Probe

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yukio Sato 1-50-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 2F051 AB09 BA07 3J006 AE14

Claims (1)

[Claims] 1. A device for measuring a partial tension force of an oil seal having a rotatable housing for holding an oil seal to be mounted on a shaft, wherein an outer diameter of the oil seal is the same as that of the shaft, and an outer peripheral surface of the oil seal has A device for measuring a partial tension of an oil seal, comprising: a cylindrical member in contact with a lip; and measuring means for measuring a distribution of a partial tension of the oil seal on an inner peripheral surface of the cylindrical member.