JP3084896B2 - Oil seal press-fitting device - Google Patents

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 to a seal fitting portion of a work.

[0002]

2. Description of the Related Art A conventional press-fitting device of this type includes a press-fit ram on which an oil seal is mounted, and a jig for holding a work above the press-fit ram, and a through-hole provided in the jig. And the oil seal is press-fitted to the seal fitting portion of the work.

[0003]

The above jig is usually attached to a work pallet. In this case, the jig is carried together with the pallet onto the press-fitting ram. At that time, it is difficult to make the axis of the through-hole of the jig exactly coincide with the axis of the press-fitting ram. If the degree of coincidence between the two axes is low, when the press-fit ram is inserted into the through-hole, the oil seal comes into contact with the lower end surface of the through-hole and tilts. Will not be press-fitted.

An object of the present invention is to provide an oil seal that is properly press-fitted to a workpiece 70 in a horizontal position even when the degree of coincidence between the axis of the press-fit ram and that of the jig is low. It is an object of the present invention to provide an oil seal press-fitting device that can perform the above-described operations.

[0005]

According to the present invention, there is provided a press-fit ram on which an oil seal is mounted, and a jig for holding a work above the press-fit ram, wherein a through-hole provided in the jig is provided. In the oil seal press-fitting device in which the press-fit ram is fitted and the oil seal is press-fitted into the seal fitting portion of the work, the oil seal is fitted to the press-fit ram by a spring force so as to maintain a horizontal posture. A seal support member for pushing up and floatingly supporting the oil seal is provided.

[0006]

When the oil seal is tilted because the degree of coincidence between the axis of the press-fit ram and the jig is low, the oil seal is pushed up by the spring force when the oil seal comes out of the jig. The posture of the seal becomes horizontal.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. An oil seal press-fitting device according to the present invention is, as shown in FIG.
And a work pallet 20 located above the press-fit ram 10, and a punch unit 30 located above the pallet 20.

The press-fit ram 10 is provided with a hydraulic cylinder 41,
It is erected on a lift table 50 horizontally supported by 41 piston rods 41a. As shown in FIG. 2, the press-fit ram 10 includes a cylindrical base 11 and a base 11.
A first seal support 12 fitted and fixed to an upper end of the first seal support;
A second seal support 13 fitted and fixed to the upper end of the base 11 so as to surround the seal support 12, and between the outer peripheral surface of the support 12 and the inner peripheral surface of the support 13. And a third seal support 15 fitted to the formed gap 14 so as to be vertically movable.

A substantially trapezoidal projection 12a is provided on the peripheral surface on the upper end side of the seal support 12 for contacting the lip 60a of the oil seal 60. Projections 13a each having a substantially trapezoidal cross section for contacting the bottom surface 60b of the base 60 are formed. An annular projection 15a is formed on the upper end of the third seal support 15 so as to fit into an annular recess 60c formed on the lower surface of the oil seal 60.

[0010] The third seal support 15 is urged upward by a spring 16 interposed in the gap 14, and therefore, as shown in FIG. It has been moved up to a position where it comes into contact with the lower side of the projection 12a.

The upper surface of the first seal support 12 is pressed by a pressing member 17 fixed to the upper end of the base 11 with bolts.

The base 11 has an oil passage 11a provided along the center axis thereof and an oil passage 11b branched from the oil passage 11a. The first seal support 12 has an annular oil reservoir 12b formed in the inner peripheral portion thereof to communicate with the oil passage 11b, and an oil passage 12c extending from the oil reservoir 12b to the upper surface of the support 12 is formed. Is formed.

The work pallet 20 is provided for carrying in and out the work 70, and is provided with a guide rail 8
It travels on 0,80. A jig 21 is provided upright at the center of the pallet 20, and the work 70 is conveyed while being held by the jig 21.

The jig 21 has a through hole 21a for fitting the ram 10 formed along the axis thereof, and the seal fitting portion 70a of the work 70 is located directly above the through hole 21a. The work 70 is held. When the oil seal 60 is fitted to the work 70, the work pallet 20 is positioned so that the through hole 21a of the jig 21 is located directly above the ram 10.

The punch unit 30 includes a punch plate 31 facing the upper surface of the ram 10, and an air cylinder 31 for moving the punch plate 31 up and down, and is supported by a support plate 90.

The operation of this embodiment will be described below. An oil seal 60 is mounted on the ram 10 by a loader (not shown) in a manner shown in FIG. Thereafter, the hydraulic cylinders 41, 41 are simultaneously retracted, and as a result, the ram 10 is raised together with the lift 50.

The elevating table 50 includes a guide post 51 movably fitted to the guide rod 44, so that it is elevated while being guided by the guide rod 44. The ram 10 is fitted into the through hole 21 a of the jig 21 of the pallet 20 while the lift 50 is being lifted.

The base 100 on which the hydraulic cylinders 41 are supported is provided with a cap 110 having an open lower portion. When the lifting platform 50 is raised to a position shown by a chain line, the guide post 51 is moved to the position shown in FIG. The lift table 50 is stopped by being fitted to the cap 110. At this time,
The ram 10 is located at the position shown in FIG. 2, that is, the position where the oil seal 60 is exposed above the jig 21.

On the other hand, before the lifting of the ram 10 is stopped, the punch unit 30 has its air cylinder 31
Is extended, whereby the punch plate 31 is lowered to the position shown by the dashed line and presses the upper end of the work 60.

The lowering operation of the punch plate 31 is completed at the same time as or immediately before the raising and lowering of the lift table 50 is stopped. Therefore, when the lifting platform 50 stops lifting, the work 70 is sandwiched between the punch plate 31 and the ram 10, and as a result, as shown in FIG.
The oil seal 60 is press-fitted into the seal fitting portion 70a.

When the fitting of the oil seal 60 is completed, the lift 50 is lowered to the initial position shown by the solid line by the extension operation of the hydraulic cylinder 41, and the punch unit 3
Punch plate 3
1 is also retracted to the initial position shown by the solid line. Then, there is no guarantee that the axis of the jig 21 of the pallet 20 exactly matches that of the ram 10 where the work 70 on which the oil seal 60 is mounted is carried out by the pallet 2 thereafter. When the degree of coincidence between the two axes is low, when the ram 10 is inserted into the through hole 21a of the jig 21, the oil seal 60 comes into contact with the lower end surface of the through hole 21a or the tapered guide surface 21b. You will lean.

If the oil seal 60 is pressed against the workpiece 70 in a state where the oil seal 60 is inclined, the oil seal 60 will not be properly press-fitted. According to this embodiment,
Such inconvenience can be prevented.

That is, in this embodiment, the oil seal 60 is levitated and supported by the seal support 13 urged by the spring 16 as shown in FIG.
Thereby, the bottom surface 60b of the seal 60 and the seal support 1
A gap (for example, about 1 mm) is formed between the upper surface and the upper surface of No. 3.

When one end of the oil seal 60 contacts the through hole 21a, the contacted side is
, And as a result, the oil seal 60 is inclined. When the ram 10 further rises and the oil seal 60 comes out of the jig 20, the inclined oil seal 60 is returned horizontally by the repulsive force of the spring 16. Therefore, even when the degree of coincidence between the two axes is low, the oil seal 60 is always properly press-fitted to the work 70 in a horizontal posture.

Grease is injected into the oil passage 11a formed along the axis of the ram 10, and the grease is supplied to the oil passage 11b, the reservoir 12b, the oil passage 12c, and the support 1
The oil is supplied to the lip of the oil seal 60 through an annular oil passage 18 formed between the upper surface of the second member 2 and the flange 17 a of the pressing member 17.

[0026]

According to the present invention, since the press-fitting ram is provided with the seal support member for floatingly supporting the oil seal by the spring force, even if the axis of the press-fitting ram does not coincide with that of the jig. , The oil seal 60 is the work 70
Is always properly pressed and fitted in a horizontal posture. Therefore, it is suitable as a press-fitting means for an oil seal applied to an automobile assembly line or the like that requires high working efficiency.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing one embodiment of a press-fitting device according to the present invention.

FIG. 2 is an enlarged sectional view showing a configuration of a press-fit ram and a press-fit mode of an oil seal.

FIG. 3 is a sectional view showing a state in which an oil seal is mounted on a press-fit ram.

[Explanation of symbols]

 Reference Signs List 10 press-fit ram 12, 13, 15 seal support 12 14 gap 16 spring 20 work pallet 21 jig 21a through hole 30 punch unit 31 punch plate 32 air cylinder 41 hydraulic cylinder 50 lift table 60 oil seal 70 work

Claims (1)

(57) [Claims] 1. A press-fit ram on which an oil seal is mounted, and a jig for holding a work above the press-fit ram, wherein the press-fit ram is fitted into a through hole provided in the jig. An oil seal press-fitting device for press-fitting the oil seal into a seal fitting portion of the work, wherein the press-fit ram is raised and supported by a spring force so that the oil seal maintains a horizontal posture. A press-fitting device for an oil seal, wherein a seal support member is provided.