JP4061883B2 - gasket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gasket used for sealing between pipe connecting elements in a pipe connecting portion, particularly an eye union type pipe connecting apparatus.
[0002]
[Prior art]
In the eye union type pipe connecting apparatus shown in FIG. 3, the gasket 4 is inserted between the head 1a of the bolt 1 and the eye union 2 and between the eye union 2 and the housing 3, and the bolt 1 is tightened to leak hydraulic oil. The pipe 5 is fixed while being sealed.
[0003]
[Problems to be solved by the invention]
As shown in FIG. 4, the conventional gasket 4 has a pair of ring-shaped portions 4a and 4b connected by a connecting arm 4c with the same outer dimensions, so that the bolt 1 is tightened when assembled. Then, the eye union 2 is swung around by the friction, and as a result, the direction of the pipe 5 is deviated.
[0004]
[Means for Solving the Problems]
The present invention has been invented to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that a bolt is screwed into a housing of a hydraulic device or a union attached to the housing, so that the housing or A gasket used in an eye union type pipe connecting device for fixing an eye union to the union, and is in contact with the pipe connecting element composed of the housing or the union, the eye union and the bolt, and between these pipe connecting elements. a plurality of ring-shaped portion that seals, as well as connecting the plurality of ring-shaped portion position in the connecting arm, than the outer diameter of the other ring-shaped portion the outer diameter of the ring-shaped portion positioned on the bolt side by setting a small, contact the contact area between the pipe connection element of the ring-like portion located at the bolt side of the other ring-shaped part Characterized by being smaller than the area.
[0005]
In the invention according to claim 1 configured as described above, since the frictional force at the ring-shaped portion located on the housing side is increased, the frictional force at the ring-shaped portion located on the bolt side acts by tightening the bolt. Even so, another ring-like portion connected to this by the connecting arm restrains the surroundings. Therefore, the rotation of the eye union accompanying the tightening of the bolt can be prevented, and the direction of the pipe integrated with the eye union can always be maintained in a constant direction .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an eye union type pipe connecting device using a gasket according to the present invention. A port 16 communicating with an oil passage (not shown) is formed in a housing 16 of a hydraulic device, and the union 14 is screwed to the port 17. Has been. Bolts 12 are screwed onto the union 14 via an eye union 13, and one end of a pipe 15 is fixed to the eye union 13. An internal space 23 is formed in the eye union 13, and the internal space 23 communicates with an oil passage in the housing 16 through a horizontal hole 24 and a vertical hole 25 formed in the eye union 12. The gasket 18 of the present invention is inserted between the head of the bolt 12 and the eye union 13 and between the eye union 13 and the union 14, and between the head of the bolt 12 and the eye union 13 and between the eye union 13 and the union 14. Sealed to prevent hydraulic fluid from leaking.
[0007]
As shown in FIG. 2, the gasket 18 includes a connecting arm 18 c and two ring-shaped portions 18 a and 18 b connected by the connecting arm 18 c, and contact between the one ring-shaped portion 18 b and the union 14. The shapes of the ring-shaped portions 18a and 18b are set so that the contact area between the other ring-shaped portion 18a and the eye union 13 is smaller than the area. Specifically, the outer diameter of the ring-shaped part 18a located on the bolt 12 side is finished to be smaller than the outer diameter of the ring-shaped part 18b located on the union 14 side. The gasket 14 is assembled such that a ring-shaped portion 18a having a small contact area is interposed between the bolt 12 and the eye union 12 and a ring-shaped portion 18b having a large contact area is interposed between the eye union 13 and the union 14. It is attached.
[0008]
When the gasket 18 having such a configuration is used in an eye union type pipe connecting device, when the bolt 12 is tightened, the ring-shaped portion 18b positioned on the union 14 side rather than the frictional force on the ring-shaped portion 18a positioned on the bolt 12 side. Therefore, even if one of the ring-shaped portions 18a tries to move around due to the tightening of the bolt 12, the other ring-shaped portion 18b connected to the ring-shaped portion 18b by the connecting arm 18c. Acts to restrain it. Therefore, the rotation of the eye union 13 accompanying the tightening of the bolt 12 can be reliably prevented, and the direction of the pipe 15 integrated with the eye union 13 can always be maintained in a constant direction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a pipe connecting device equipped with a gasket according to the present invention.
FIG. 2 is a view showing an embodiment of a gasket according to the present invention.
FIG. 3 is a cross-sectional view of a conventional pipe connection device.
FIG. 4 is a view showing a conventional gasket.
[Explanation of symbols]
12 Bolt 13 Eye union 14 Union 15 Piping 16 Housing 18 Gasket 18a Ring-shaped part 18b Ring-shaped part 18c Connecting arm

Claims (1)

A gasket for use in an eye union type pipe connection device for fixing an eye union to the housing or the union by screwing a bolt into a housing of a hydraulic device or a union attached to the housing. or union, eye union, in contact with the pipe connection element consists of a bolt having a plurality of ring-shaped portion for sealing between these pipes connecting elements, as well as connecting the plurality of ring-shaped portion position in the coupling arm By setting the outer diameter of the ring-shaped part located on the bolt side to be smaller than the outer diameter of the other ring-shaped part, the contact area between the ring-shaped part located on the bolt side and the pipe connection element can be changed. A gasket characterized by being set smaller than the contact area of the ring-shaped part.

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