JPH06143155A - Dust seal pressing-in device for king pin - Google Patents

Abstract

PURPOSE:To simply and quietly press a dust seal for a king pin in a pair of the king pin hole stepped parts of a knuckle. CONSTITUTION:A dust seal D1 is fitted in an inserted manner in the outer end part 17 of a cup-form first cylinder 1. A dust seal D2 is fitted in an inserted state in the outer end part 36 of a second cylinder 2 substantially integrally attached to the rod 34 of a piston 3, and the piston 3 is slid by means of an oil pressure or an air pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting device for press-fitting a dust seal into a stepped portion provided at opposed opening edges of a pair of kingpin holes of a knuckle.

[0002]

2. Description of the Related Art As shown in FIG.
Is formed in a bifurcated shape, and a pair of kingpin holes 71 into which kingpins (not shown) are fitted are bored. Bushings 72 are press-fitted into these holes, respectively, and are formed at opposite opening edges 73. The dust seal R is press-fitted into the stepped portion 74. Conventionally, the dust seal R is conventionally press-fitted by hammering one by one in a narrow space in the fork.

[0003]

The press-fitting operation of the dust seal for the kingpin requires a great deal of time because the dust seal is press-fitted one by one as described above and the hammer is used to hold the impact. However, there is a problem in that noise is generated and the work is performed in a narrow space in the fork, which requires skill.

It is an object of the present invention to provide a kingpin dust seal press-fitting device capable of simply and quietly and uniformly pressing a kingpin dust seal into a pair of kingpin hole steps of a knuckle.

[0005]

SUMMARY OF THE INVENTION The present invention is a press-fitting device for press-fitting a dust seal into a stepped portion provided at opposed opening edges of a pair of kingpin holes of a knuckle, wherein a first dust seal is provided at an outer end portion. A first cylinder having a holding portion and a second dust seal holding portion formed at an outer end thereof are fixed to a rod of a piston sliding in the first cylinder, and the outer circumference of the first cylinder is fixed. A second cylinder that slides is provided.

[0006]

[Description of Operation and Effects] In the kingpin dust seal press-fitting device configured as described above, when hydraulic pressure is applied to the piston in the first cylinder, the second cylinder fixed to the piston rod moves in the opposite direction to the first cylinder. As a result, both cylinders press the first dust seal and the second dust seal held at the ends close to the kingpin hole of the knuckle into the stepped portion of the kingpin hole. Therefore,
It is possible to perform the work done by hand one by one at the same time at the same time, and it is done quietly because it does not hit, and since the second cylinder is slid on the outer circumference of the first cylinder, the centers of both cylinders are always aligned. The dust seal can be pressed in uniformly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a kingpin dust seal press-fitting device embodying the present invention. In this figure, the present device 4 comprises a first cylinder 1, a second cylinder 2, a piston 3 and the like. In the first cylinder 1, a substantially cup-shaped cylinder body 11 and a cap 12 arranged so as to close the opening thereof are fixed to each other by a bolt 13 while sandwiching the seal ring R1 so as to keep airtightness to the outside. It has become. The plug 12 has a seal ring R2 fitted in the circumferential groove 14 of its inner diameter portion so as to keep airtight between the plug 12 and a rod 34, which will be described later. And plug 12
The first cylinder 1, which is formed substantially integrally with, has an oil passage 18 that communicates from the outside through the plug 12 into the cylinder, and an oil passage 19 that communicates directly from the inside of the cylinder to the outside. The inner diameter portion 15 and the outer peripheral portion 16 of the first cylinder 1 are concentric with each other, and the outer end portion 17 has the first dust seal D1.
The diameter is set to allow smooth sliding.

The second cylinder 2 is formed in a cup shape having a hole 21 formed in the center thereof, and the inner diameter portion 22 has an inner diameter portion 22.
It is slidable on the outer peripheral portion 16. Piston 3
While inserting the seal ring R3 into the circumferential groove 31, the first
It is formed integrally with a rod 34 that slides on the inner diameter portion 15 of the cylinder 1 and has a threaded portion 33 at its tip. The outer diameter portion 36 of the round nut 35 that is screwed into the screw portion 33 forms the outer end portion of the second cylinder 2 and is set to have a diameter that allows the second dust seal D2 to slide smoothly. Then, while the second cylinder 2 is brought into contact with the rod end portion 37, the round nut 35 is screwed into the screw portion 33 and fixed by the screw 38 to assemble the kingpin dust seal press-fitting device. As shown in FIG. 2, a U-shaped handle 25 is fixed to the outer circumference of the second cylinder 2 by welding so that it is convenient to carry.

FIG. 3 shows an actuation unit 5 for actuating the device 4 hydraulically, which in this case is a handle 25.
The base plate 8 together with the operation handle 52 via the stay 51 welded to the first cylinder 1 (see FIG. 1) is not attached.
It is fixed to 0 and is hung from a high place (not shown) in the hole 81 of the substrate 80 via a hook 82. Operation handle 5
Switch boxes S1 and S2 are disposed at both ends of the switch 2. The switch boxes S1 and S2 are provided with a press-fitting operation button 53, a return operation button 54, and an emergency stop button 55, respectively. When the buttons are pressed, a hydraulic pump drive motor (not shown) is turned on via the wiring L.
It is designed to be turned off and on. Oil path 1 of the device 4
8 and 19, oil pipes 56 and 57, and oil hoses 58 and 5
It is connected to the pressure oil source P via 9.

Next, the operation of the kingpin dust seal press-fitting device according to the present invention will be described with reference to FIG. In this figure, the oil stored in the oil pan 61 is the motor M.
Driven by the oil pump 62 directly connected to the filter 68
The one-way control valve 63 is suctioned through the one-way control valve 63 while maintaining a constant discharge pressure by interposing a flow control valve 64.
And is connected to the oil passage 18 (19) of the present device 4. The one-way control valve 63 is operated by depressing the press-fitting operation button 53 or the return operation button 54 shown in FIG. 3 in a method of moving the plunger 65 by exciting or demagnetizing the solenoid. In the illustrated state, the solenoid is demagnetized by pressing the return operation button 54 and the elastic force of the spring 66 moves the plunger 65 to the left side in the figure. The round nut 36, which is injected into the inner rod 34 side and is the outer end of the second cylinder, moves in a direction closer to the first cylinder 1. Therefore, the device 4 can be moved in and out between the knuckles. Next, if the press-fitting operation button 53 is pressed,
The solenoid is excited and the plunger 65 moves to the right in the figure against the elastic force of the spring 66, and the pressure oil is injected into the front side of the piston 3 in the first cylinder 1 through the oil pipe 59 and the oil passage 19. Both cylinders move in directions away from each other. Therefore, if the dust seals D1 and D2 are held by the outer end portions 17 and 36 of both cylinders, the dust seals can be press-fitted into the opposed step portions of the knuckle. Reference numeral 67 indicates a pressure gauge, and in this case, the discharge pressure of the oil pump is set to 30 kg / cm ² .

In the above description, the hydraulic device is used for the operation of this device. However, the present invention is not limited to this, and it goes without saying that a pneumatic device may be used as another embodiment. That is, in the pneumatic device, as shown in FIG. 5, the pressure air from the pressure air source PA causes the first filter 81, the shutoff valve 82 and the second filter 81.
The one-way control valve 66A is passed through the filter 83 while maintaining a set pressure of 4.5 kg / cm ² by the flow control valve 64A.
Then, the device 4 is reached. Compared to the case where a hydraulic device is used, the set pressure is different, a shutoff valve 82 is used, and the flow control valve 64A and the one-way control valve 66A, etc., are used for hydraulic pressure control valve 64 and the one-way control valve 66, and the specification dimensions are different. Even if it is different, there is practically no change and the effect is the same.

[0013]

Since the present invention has the above-described structure, the kingpin dust seal can be simply and quietly and uniformly pressed into the pair of kingpin hole steps of the knuckle.

[Brief description of drawings]

FIG. 1 is a sectional view of a kingpin dust seal press-fitting device embodying the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a configuration diagram of a hydraulic operating unit used with the present device.

FIG. 4 is a hydraulic system diagram of a kingpin dust seal press-fitting device embodying the present invention.

FIG. 5 is a pneumatic system diagram according to another embodiment of the present invention.

FIG. 6 is a knuckle to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st cylinder 2 ... 2nd cylinder 3 ... Piston 4 ... King pin dust seal press-fitting apparatus 17 ... 1st cylinder outer end part 34 ... Rod 36 ... 2nd Round nut that is the outer end of the cylinder D1, D2 ... Dust seal

Claims (1)

[Claims] 1. A press-fitting device for press-fitting a dust seal into stepped portions provided at opposed opening edges of a pair of kingpin holes of a knuckle, wherein a first cylinder having a first dust seal holding portion formed at an outer end thereof. And a second cylinder that is fixed to the rod of the piston that slides in the first cylinder and that slides on the outer circumference of the first cylinder, with the second dust seal holding portion formed at the outer end portion. A dust pin press-fitting device for king pins, which is characterized by being provided.