JP2540897Y2 - Cross-shaft universal joint through-hole sealing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a through hole of a cross shaft universal joint, and more particularly to a cross shaft universal joint used in a roll mill or the like for opening and closing the through hole of the coupling yoke. The present invention relates to a sealing device that freely closes.

[0002]

2. Description of the Related Art Generally, a cross shaft universal joint of this type is employed for a drive shaft of a rolling mill for rolling steel or the like, and has a yoke constituting a drive side or a driven side. As shown in FIG. 6, the yoke 100 constituting the driven side
, A through hole 103 is formed to face a greasing nipple 102 attached to a cross portion of the cross shaft 101. This through hole 103 is for supplying oil through the nipple 102. The lubricant supply mechanism of the cross joint is described in, for example,
It is disclosed in 164826.

Since the drive shaft is used in a state where cooling water is applied, it is necessary to close the through hole 103 so that the cooling water does not enter the inside of the yoke 100. Therefore, conventionally, as a through-hole sealing device, a metal cover member 104 has been closed with a bolt 105 at the entrance side step portion of the through-hole 103.

[0004]

As described above, in the conventional structure, since the metal cover member 104 is fastened by the bolts 105, the attachment / detachment of the cover member 104 is troublesome, and the time and labor required for the greasing operation are increased. It was hanging. The present invention has been made in view of the above problems, and has as its object to provide a through-hole sealing device for a cross-shaft universal joint that can easily and quickly perform a greasing operation.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a cross-hole sealing device for a cross shaft universal joint according to the present invention is formed on a coupling yoke in a state facing a greasing nipple of the cross shaft. In a through-hole sealing device for a cross-shaft universal joint having a cover that closes a through-hole in the rotation axis direction ,
Rutotomoni provided a seal portion which is removably fitted in the state of holding the liquid tightness by being press-fitted into the inner peripheral surface of the through hole integrally with the cover portion, bunch for insertion in the cover portion
It is characterized by providing hands .

[0006]

According to the above construction, the seal portion is provided with the coupling yo.
Press-fit into the inner peripheral surface of the through hole in the direction of the axis of rotation
Thereby, the cover part closes the through hole in a state where the cover part is freely inserted and removed. At this time, the seal part is located on the inner peripheral surface of the through hole.
Since it is press-fitted, the friction generated between the seal member and the through hole
By the friction force, the cover part is held in the through hole
Become. Further, the through-hole is easily opened by grasping and pulling the handle provided on the cover.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below in detail with reference to the accompanying drawings. FIG. 3 is a partial cross-sectional side view of a cross-shape universal joint 20 showing an example of use of the through-hole sealing device 10 in one embodiment of the present invention. The yoke 21 is provided with a through hole 23 formed at the center of the body of the yoke 21 so as to face the cross portion of the cross shaft 22. The outlet side of the through hole 23 is opposed to the greasing nipple 24 formed in the cross portion of the cross shaft 22, so that the worker can perform greasing work on the greasing nipple 24 from the inlet side. It has a diameter of In FIG. 3, reference numeral 25 denotes a fitting yoke connected to the driving side of the cross shaft 22.

Referring to FIG. 1, a step is formed on the entrance side of the through hole 23, and the sealing device 10 of the present invention is fitted into the step. The sealing device 10 includes a cover portion 11 for closing the entrance of the through hole 23, and a cover portion 11.
And a seal portion 12 that is fixed to the outer periphery of the cover portion and seals a space between the cover portion 11 and the through hole 23.

The cover portion 11 is integrally formed by fixing a pair of plate members to each other with a bolt 13 and a nut 14 while sandwiching the seal portion 12 on the outer peripheral side. With the fastening force of 13, the seal portion 12 is sandwiched on the outer periphery. A handle 15 is disposed on the outer surface of the cover 11 (the surface opposite to the through hole 23), and the handle 15 is fastened together by the bolt 13.

Referring to FIG. 2, the seal portion 12 has an annular main body portion 12a integrally fixed to a ring-shaped core 16 having an L-shaped cross section, and the cover portion 11 has an outer periphery around the main body portion 12a. An annular lip portion 12b extending conically in the direction opposite to the insertion direction (the right side in FIG. 2) and slidingly contacting the inner periphery of the step portion of the through hole 23 is integrally formed of hard rubber (vulcanite). In this embodiment, the outer peripheral side of the annular lip portion 12b is formed thicker in the radial direction to ensure sufficient wear resistance and elasticity. Further, the diameter of the annular lip portion 12b is set slightly larger than the step portion of the through hole 23 in the free state by the amount of interference.

According to the above configuration, when the cover portion 11 is fitted to the step portion of the through hole 23 by grasping the handle 15, the seal portion 12 moves inward by the above-mentioned interference in the radial direction of the through hole 23. The through-hole 23 is closed while being kept liquid-tight together with the cover part 11 by being pressed and elastically bent.
Further, when the user grips the handle 15 and pulls out the cover portion 11 from the step of the through hole 23, the through hole sealing device 10 is easily separated from the through hole 23.

As described above, according to the present embodiment, the through-hole 23 can be easily closed and opened simply by grasping the handle 15 and inserting and removing the through-hole sealing device 10 from the step of the through-hole 23. Therefore, the attachment and detachment of the device is easy and quick, and the efficiency of the greasing operation can be improved. 4 and 5
In another embodiment shown in FIG. 7, a through-hole sealing device 30 integrally formed of a soft resin such as vinyl chloride is shown. The through-hole sealing device 30 includes an annular peripheral wall 31 and an end wall 32 that closes one end of the peripheral wall 31.
Reference numeral 1 designates a seal portion, and the end wall 32 constitutes a cover portion. A number of slits 33 are formed on the other end of the peripheral wall 31 so as to extend in the direction of the center line, so that the other end of the peripheral wall 31 can be bent in the radial direction. On the other hand, the step portion of the through hole 23 is formed in a tapered shape in which the outlet side is narrower than the diameter of the peripheral wall 31 by the interference. In FIG. 4, reference numeral 34 denotes an air vent hole formed in the end wall 32, and reference numeral 35 denotes a handle fixed to the end wall 32 by screws 36.

According to the configuration shown in FIGS.
When the through hole sealing device 30 is fitted into the step portion of the through hole 23 by grasping the other end, the other end side of the peripheral wall 31 as a seal portion is pressed inward by the radially-tightening margin of the through hole 23. End wall 3 as a cover part by elastically bending.
The through hole 23 is closed while maintaining the liquid tightness together with 2. Further, when the cover portion 11 is pulled out from the step portion of the through hole 23 by grasping the handle 35, the sealing device 30 is easily separated from the through hole 23. 4 and 5, the through-hole 23 can be easily closed and opened simply by grasping the handle 35 and inserting and removing the through-hole sealing device 30 from the step of the through-hole 23. . Therefore, the attachment and detachment of the device is easy and quick, and the efficiency of the greasing operation can be improved.

The above-described embodiment is merely a preferred specific example. For example, the cover portion described with reference to FIGS. 1 and 2 may be formed of resin, or the through-hole sealing device 30 shown in FIGS. It goes without saying that various design changes are permitted within the scope of the utility model registration claim, such as attachment to and detachment from a through hole that is not present.

[0015]

As described above, according to the cross-hole universal joint sealing device of the present invention, the inner peripheral surface of the through-hole
Occurs between the seal part that is pressed into the inner peripheral surface of the through hole
Cover part with handle can be attached and detached by frictional force
Can be held in the through hole at the same time.
Simply by grasping the hand and inserting and removing the through-hole sealing device into and from the through-hole, the through-hole can be easily closed and opened. Therefore, the attachment and detachment of the device is easy and quick, and the efficiency of the greasing operation can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is an enlarged partial view of a main part of FIG.

3 is a partial cross-sectional side view of a cross shaft universal joint showing an example of use of the through-hole sealing device in the embodiment of FIG. 1;

FIG. 4 is a sectional view of a main part showing another embodiment of the present invention.

5 is a partial cross-sectional side view of a cross shaft universal joint showing an example of use of the through hole sealing device in the embodiment of FIG. 4;

FIG. 6 is a sectional view of a main part showing a conventional through-hole sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Through-hole sealing device 11 Cover part 12 Seal part 21 Yoke 23 Through-hole 30 Through-hole sealing device 31 Peripheral wall (component of seal part) 32 End wall (component of cover part)

Claims (1)

(57) [Scope of request for utility model registration] 1. A through-hole sealing device for a cross-shaft universal joint having a cover for closing a through-hole in a direction of a rotation axis formed in a coupling yoke in a state facing a greasing nipple of a cross-shaft, Being pressed into the inner peripheral surface of the through hole
Rutotomoni provided a seal portion which is removably fitted in the state of holding the liquid tightness integrally with the cover portion by, the mosquito
A through hole sealing device for a cross shaft universal joint, wherein a handle for insertion and removal is provided on a bar portion .