JPH06210526A - Oil seal press-fit device - Google Patents

Abstract

PURPOSE:To provide an oil seal press-fit device with which if an oil-seal press-fit direction is normal or inverse can be detected. CONSTITUTION:In an oil seal press-fit device for pressing an oil seal into a circular seal hole by a press-g unit, the press-fit unit 10 is provided with a pushing part 12 to be applied to an end surface of an oil seal 50 to push it, a snap part 22 provided on the inner circumferential side of the pushing part 12, formed to be closely applied to a lip outer edge part 53 of the oil seal, and protruded before the pushing part 12, and an air discharge part 28 opened and formed between the pushing part and the snap part 22 at a forward end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal press-fitting device for press-fitting an oil seal into a seal hole of a shaft member penetrating a work.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for automatically press-fitting an oil seal into a seal hole, for example, the actual opening sho 63-144.
An oil seal press-fitting device such as No. 136 has been proposed.

In this press-fitting device, the oil seal is held in front of the seal hole, and the push rod is moved forward so that the pushing part abuts against the end face of the oil seal and is pushed out to press-fit the oil seal into the seal hole. Is configured.

Then, by detecting the back pressure of the air discharge port provided on the front end surface of the pushing portion, the presence or absence of an oil seal and the fitting failure such as the slant fitting in the seal hole have been confirmed. .

[0005]

However, in the press-fitting device for an oil seal having such a conventional structure, since the pushing portion is formed in a flat shape, even if the press-fitting direction of the oil seal is reversed, the air-sealing is performed. There was a problem that a back pressure was generated at the discharge port, which made it impossible to confirm the reverse press-fitting of the oil seal.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an oil seal press-fitting device capable of detecting whether the oil seal press-fitting direction is normal or reverse. It is what

[0007]

The present invention has been made to achieve the above object, and is an oil seal press-fitting device for press-fitting an oil seal into an annular seal hole by a press-fitting unit. Is a push-out portion that can be pushed out by contacting the end face of the oil seal at the tip end,
Between the snap part, which is provided on the inner peripheral side of the extruding part and is formed so as to be in close contact with the lip outer edge part of the oil seal and which projects forward from the extruding part, and between the extruding part and the snap part. A press-fitting device for an oil seal, comprising: an air discharge port formed with an opening.

[0008]

The present invention is configured as described above, and when the end surface of the oil seal and the outer edge of the lip are in a normal posture relative to the pushing portion and the snap portion of the press-fitting unit,
By the forward movement of the press-fitting unit, the pushing portion comes into contact with the end surface of the oil seal, and the snap portion comes into close contact with the lip outer edge portion of the oil seal.

As a result, the air discharge port is closed, the back pressure of the air discharge port rises, and the normal posture of the oil seal is confirmed. By further advance of the press-fitting unit,
The end surface of the oil seal is extruded into the extruding portion and press-fitted into the seal hole.

When the outer end surface of the oil seal is in the opposite posture to the push portion and the snap portion of the press-fitting unit, the snap portion comes into contact with the outer end surface of the oil seal due to the forward movement of the press-fit unit, and the push portion of the oil seal It is separated from the outer end surface.

As a result, the air from the air discharge port is discharged into the atmosphere, the back pressure of the air discharge port does not rise, and the abnormal posture of the oil seal is confirmed.

Further, even when the oil seal is in an oblique posture, the snap portion of the press-fitting snap abuts on the oil seal, and a gap is formed between the pushing portion and the oil seal. Therefore, the air is discharged from the air discharge port into the atmosphere, and the back pressure of the air discharge port does not rise.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oil seal press-fitting device of the present invention will be described below with reference to FIGS.

The press-fitting unit 10 of this oil-seal press-fitting device is provided with an extruding portion 12 that abuts on the end surface 51 of the oil seal 50, and a snap provided on the inner peripheral side of the extruding portion 12 so as to project forward from the extruding portion 12. Portion 22, and an air discharge port 28 formed as an opening between the pushing portion 12 and the snap portion 22.
It is mainly composed of.

The press-fitting unit 10 is a main body 11 made of a cylindrical member having a hollow portion 15 having a round hole opened at the tip thereof.
And a snap member 21 formed of a cylindrical member and integrally fixed in the hollow portion 15 of the main body 11 with the axis shared.

A small-diameter push-out portion 12 which can be fitted into the seal hole 41 of the work 40 is formed at the tip of the main body 11, and a plurality of discharge grooves 13 are provided at the step portion. In addition, the snap member 2 is provided at the bottom of the hollow portion 15 of the main body 11.
A small diameter portion 16 that closely fits 1 is formed, and a communication hole 17 that communicates the atmosphere of the hollow portion space of the fixed snap member 21 is formed. Further, an air connection port 18 communicating with the hollow portion 15 is provided on the side surface of the main body 11.

The snap member 21 has a hollow space into which the shaft member 42 for externally fitting the oil seal 50 can be inserted. The snap member 21 has a tip end portion matching the outer shape of the lip outer edge portion 53 and the lip outer edge portion 53. Snap part 2 that can be tightly sealed
2 is formed.

The snap member 21 is fitted in the hollow portion 15 of the main body 11, and the outer peripheral wall of the snap member 21 is closely fitted to the small diameter portion 16 and is fixed by the fixing screw 23. The snap portion 22 projects from the tip end surface of the pushing portion 12, and an air supply path 27 formed of an annular gap is formed between the outer peripheral wall of the snap member 21 and the inner wall of the main body 11. One end of the air supply passage 27 communicates with the air connection port 18, and the tip end side is opened between the push-out part 12 and the snap part 22 to form an annular air discharge port 28.

The press-fitting unit 10 formed in this way
The base end portion 14 is connected to a rod 30 of an air cylinder (not shown) by a pin 31 so as to be movable back and forth in the axial direction of the seal hole 41. The air supply port 33 has an air supply source 33, an air filter 35, a regulator 36, and a pressure switch 37.
Are connected by a pipe 38.

Next, the operation of the oil seal press-fitting device thus configured will be described.

The work 40 into which the oil seal 50 is press-fitted is, for example, a throttle body of an automobile engine, and an annular seal hole 41 is formed in its side wall.
A shaft member 42, which is a throttle shaft, penetrates through the seal hole 41 and projects therefrom.

The oil seal 50 has a lip 52 formed on the inner peripheral side of one end surface 51 and the other outer end surface 54.
Are formed in a substantially flat shape. The reference numeral 53 indicates an outer edge of the lip.

To press-fit the oil seal 50, first, the rod 30 of the oil seal press-fitting device is driven to move the press-fitting unit 10 to the retracted position, and the oil seal 50 is externally set at a predetermined position of the shaft member 42 ( (See FIG. 1). Then
Air having a predetermined pressure is supplied from the air supply device 33 to the air connection port 18, air is discharged from the air discharge port 28, and the rod 30 is driven to advance the press-fitting unit 10 toward the seal hole 41.

The end face 51 of the oil seal 50 and the lip 52
Is set in a normal posture relative to the press-fitting unit 10, the push-out unit 1 is moved forward to move the push-out unit 1
2 contacts the end surface 51 of the oil seal 50,
The snap portion 22 closely contacts the lip outer edge portion 53. At this time, the extruded portion 12 and the end surface 51, and the snap portion 22 and the lip outer edge portion 53 adhere to each other while maintaining airtightness,
The air discharge port 28 is closed.

As a result, the back pressure of the air discharge port 28 rises, the pressure switch 37 is turned on, and the oil seal 50 is displayed in a normal posture. Then, the press-fitting unit 10 is further advanced to press-fit the oil seal 50 into the seal hole 41 (see FIG. 2). At the time of this press-fitting, the forward pressure of the press-fitting unit 10 is the push-out portion 12 and the end surface 5
1 and the snap portion 22 and the lip outer edge portion 53.
Between the first and the second, the lip 52 is first kept in close contact and is pressed into the lip 52 without damage.

It should be noted that, at the time of press-fitting, the extruding portion 12 has a seal hole 41
Then, the oil seal 50 is pressed into a predetermined position (this position is defined by the contact between the step portion of the pushing portion 12 and the edge portion of the seal hole 41). At this time, the air on the front surface of the pushing portion 12 is discharged from the discharge groove 13. Also, the shaft member 42
Enters into the hollow space of the snap member 21, and a part of the air in the hollow space is discharged from the communication hole 17.

When the outer end surface 54 of the oil seal 50 is set in the opposite posture to face the press-fitting unit 10, the forward movement of the press-fitting unit 10 causes the snap portion 22 to come into contact with the outer end surface 54 and the push-out portion 12 to move. , The state of being separated from the outer end surface 54 by the protruding dimension of the snap portion 22 (see FIG. 3).
reference). Therefore, the air discharge port 28 is not closed, the air from the air discharge port 28 is continuously discharged into the atmosphere, and the back pressure of the air discharge port 28 does not rise.

Therefore, the pressure switch 37 is not turned on, and a warning display indicating that the oil seal 50 is in an abnormal posture is displayed. This display gives an alarm by sound or light and immediately stops the forward drive of the press-fitting unit 10.

The axis of the oil seal 50 is the shaft member 4
If it is set diagonally to the axis of 2,
By the forward movement of the press-fitting unit 10, the snap portion 22 comes into contact with any part of the oil seal 50, and a gap is formed between the pushing portion 12 and the oil seal 50. Therefore, as in the case of the reverse posture, the back pressure of the air outlet 28 does not rise, and the pressure switch 37 gives a warning display.

Further, when the oil seal 50 is not set on the shaft member 42, the press-fitting unit 10 advances without pushing out the oil seal 50, and the pushing portion 12 and the snap portion 22 reach the inside of the seal hole 41. To do. At this time, the air discharged from the air discharge port 28 is
And it is discharged into the atmosphere from the communication hole 17 through the gap between the snap member 21 and the shaft member 42. Therefore,
The back pressure of the air discharge port 28 does not rise, and the pressure switch 37 gives a warning display.

The present invention is not limited to the above description and the illustrated examples, and its embodiment can be changed without departing from the technical idea of the present invention. For example, the cross-sectional shape of the snap portion may be round, square, or the like, and the air supply path may be a groove that connects the air connection port and the air discharge port.

[0032]

As described above, according to the press-fitting device for an oil seal of the present invention, the push-out portion that comes into contact with the end face of the oil seal and the lip portion of the oil seal that projects forward from the push-out portion are closely attached. Since it is provided with a snap section and an air discharge port opened between the pushing section and the snap section, it is possible to accurately detect whether the oil seal is normally or reversely pressed when the oil seal is pressed. , It is possible to reliably detect an oblique posture of the oil seal or an abnormality of no insertion.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a press-fitting device for an oil seal according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which an oil seal is press-fitted in a normal posture.

FIG. 3 is an explanatory view showing a state in which the oil seal is in a reverse posture.

[Explanation of symbols]

 10 Press-Fit Unit 12 Extrusion Part 22 Snap Part 28 Air Discharge Port 50 Oil Seal 51 End Face 53 Lip Outer Edge

Claims (1)

[Claims] 1. An oil seal press-fitting device for press-fitting an oil seal into a ring-shaped seal hole by a press-fitting unit, wherein the press-fitting unit has a push-out portion capable of pushing out at an end thereof in contact with an end face of the oil seal. Between the snap portion, which is provided on the inner peripheral side of the extruding portion and is formed so as to be in close contact with the lip outer edge portion of the oil seal and which projects forward from the extruding portion, and between the extruding portion and the snap portion. An oil seal press-fitting device comprising an air discharge port formed with an opening.