JPH0925923A - Washer with seal - Google Patents

Abstract

(57) [Abstract] [Problem] Fluid penetrates into the gap between the bolt and washer,
A washer that does not leak when this fluid reaches the contact surface between the surface of one fixed member, the lower surface of the washer's seal, and the lower surface of the bolt head and the seat surface of the main body of the washer The purpose is to do. SOLUTION: The fixed member 3 is a bolt 1 and a nut 2.
In the washer which is interposed between the surface of the fixed member 3 to be fastened and the lower surface of the head 6 of the bolt 1 or between the surface of the fixed member 3 and the lower surface of the nut 2,
The main body portion 8 is formed with a large hole portion 10 through which the shaft portion of the bolt 1 is inserted, and a seal portion 9 fitted into the large hole portion 10 of the main body portion 8 and made of an elastic material is provided. The fixed member 3 has a bolt insertion hole having a larger diameter than the shaft portion of the bolt 1 and one side portion projecting in the axial direction of the bolt 1 from the seat surface of the main body portion 8.
, The lower surface of the head 6 of the bolt 1 or the lower surface of the nut 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer with a seal for preventing fluid from leaking or entering from a contact portion between a bolt and a washer used in hydraulic / pneumatic equipment, pumps, automobiles, motors, control equipment and the like. is there.

[0002]

2. Description of the Related Art Conventionally, when a member to be fixed is fastened with bolts and nuts, the friction of the contact surface increases as it is tightened, and if the surface of the member is not smooth, the member cannot be sufficiently tightened. And a washer was installed between the underside of the head of the bolt and the underside of the nut. Also, when the fixed member fastened with fastening parts such as nuts, bolts and washers is used in an environment where it is exposed to fluid such as liquid or gas, make sure that this fluid does not leak from the contact surface between the bolt and washer. In addition, the main body of the washer is provided with a seal portion.

A conventional washer having this seal portion is, for example, as shown in FIG. As shown in FIG. 3, the fixed member 32 includes a bolt 30 and a nut 3.
1 is fastened, and a washer is interposed between the surface of one fastened member 33 that is fastened and the lower surface of the head 35 of the bolt 30. The washer is configured such that a seal portion 38 made of rubber is fitted into a main body portion 37 made of metal. Hereinafter, this washer is called a washer with a seal. The main body portion 37 and the seal portion 38 are cylindrical, and a hole portion 39 through which the shaft portion of the bolt 30 is inserted is formed in the center portion.

In this state, since the hole formed in the washer 36 with seal is larger than the shaft of the bolt 30, the head of the bolt 30 is located between the washer 36 with seal and the shaft of the bolt 30. A gap 40 is opened in the vertical direction from the lower surface of 35 to the upper surface of the nut 31.

[0005]

According to the above-mentioned conventional structure, the fluid infiltrates from the contact surface between the seat surface of the nut 31 and the lower surface of the other fixed member 34, and this fluid is the washer with a seal. 36 between bolt 36 and shaft of bolt 30
0, and the surface of one of the fixed members 33 and the sealing portion 3
Even if it reaches the contact surface with the lower surface of 8, one of the fixed members 33
Since the seal portion 38 that comes into contact with the surface of is made of rubber, fluid does not leak from this contact surface. However, when the fluid reaches the contact surface between the lower surface of the head portion 35 of the bolt 30 and the seat surface of the body portion 37, the body portion 37 in contact with the lower surface of the head portion 35 of the bolt 30 is made of metal, Since the sealing property is poor, there is a problem that fluid leaks from this contact surface.

The present invention solves the above-mentioned problems, and
Fluid penetrates into the gap between the bolt and washer, and this fluid reaches the contact surface between the surface of one fixed member, the lower surface of the washer seal, and the lower surface of the bolt head and the seat surface of the washer body. The purpose is to provide a washer that does not leak fluid.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for fastening a fixed member with a bolt and a nut between the surface of the fixed member to be fastened and the lower surface of the head of the bolt. , Or a washer interposed between the surface of the fixed member and the lower surface of the nut, the main body having a large hole portion for inserting the shaft portion of the bolt, and the elastic member fitted in the large hole portion of the main body portion. And a seal portion having a larger diameter bolt insertion hole than the shaft portion of the bolt, and one side portion projecting in the axial direction of the bolt from the seat surface of the main body portion is the surface of the fixed member, The configuration is such that it contacts either the lower surface of the head of the bolt or the lower surface of the nut.

Further, an auxiliary washer having a hole portion which is fitted into the large hole portion of the main body portion and through which the shaft portion of the bolt is inserted is provided.
The surfaces of the auxiliary washer and the seal portion, which face each other, are tapered so as to be concentric with the axial center of the bolt.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of a washer with a seal according to a first embodiment of the present invention.

As shown in FIG. 1, 1 is a bolt having a hexagonal head at one end of a screw portion, 2 is a nut, and one fixed member 4 and the other fixed member are fixed by the bolt 1 and the nut 2. The member 5 is fastened. A washer 7 with a seal is interposed between the lower surface of the head 6 of the bolt 1 and the surface of one of the fixed members 4, and the fixed member 3 is sufficiently fastened through the washer 7 with a seal. ing.

The washer 7 with a seal is composed of a body 8 made of metal and a seal 9 made of rubber.
The main body 8 has a cylindrical shape, a large hole 10 is formed in the center, and a step 11 is formed inside the large hole 10.
The seal portion 9 is also cylindrical and has a hole portion 12 formed at the center thereof, and a groove portion 13 is formed at the outer peripheral portion of the hole portion 12. In this state, the seal portion 9 is inserted into the large hole portion 10 of the main body portion 8 and the stepped portion 11 of the main body portion 8 and the groove portion 13 of the seal portion 9 are fitted to each other to form the washer 7 with a seal.

The operation of the above configuration will be described below.
When the washer 7 with a seal is attached, the bolt 1 is arranged by inserting the hole 12 of the seal portion 9 and the fixed member 3 that are overlapped with each other, and the nut 2 screwed to the bolt 1 is tightened and fastened.

In this state, the hole formed in the washer 7 with a seal is larger than the shaft of the bolt 1 as in the conventional case. Therefore, the bolt between the washer 7 with a seal and the shaft of the bolt 1 is not provided. A gap 14 is opened in the up-down direction from the lower surface of the head 6 of No. 1 to the upper surface of the nut 1.

However, the seal portion 9 fitted in the main body portion 8
Is projected from the seating surface and the lower surface of the main body portion 8 toward the shaft portion of the bolt 1, and the protruding portions are in contact with the lower surface of the head portion 6 of the bolt 1 or the surface of one fixed member 4, respectively. Exhibits sealing properties. For this reason, the fluid enters from the contact surface between the seat surface of the nut 2 and the lower surface of the other fixed member 5, and the gap 1 between the shaft portion of the bolt 1 and the washer 7 with a seal is formed.
Even if the fluid passes through the contact hole 4 and reaches the contact surface between the lower surface of the seal portion 9 and the surface of the one fixed member 4, the seat surface of the seal portion 9 and the lower surface of the bolt 1, the fluid does not leak.

FIG. 2 is a partial sectional view of a washer with a seal according to a second embodiment of the present invention. Members having the same operations as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 2, the washer 15 with a seal is composed of a body portion 16, a seal portion 17 and an auxiliary washer 18. The main body 16 has a cylindrical shape, and an intermediate hole 19 is formed in the center of the seat surface and a large hole 20 is formed in the center of the lower surface. Similarly, the seal portion 17 is also cylindrical and has a hole 21 formed in the center thereof, and the lower surface of the seal portion 17 is formed in a tapered shape. The auxiliary washer 18 is also cylindrical and has a hole 22 formed in the center thereof, and the seat surface of the auxiliary washer 18 is also tapered. In this state, the seal portion 17
And the auxiliary washer 18 is fitted into the large hole portion 20 to form the washer 15 with a seal.

The operation of the above configuration will be described below.
When mounting the washer 15 with a seal configured as described above, the bolt 1 is inserted into the hole portion 21 of the seal portion 17, the middle hole portion 19 and the large hole portion 20 of the main body portion 16, and the hole portion 22 of the auxiliary washer 18. At the same time, the superimposed fixed members 3 are inserted and arranged. At this time, the tapered lower surface of the seal portion 17 fitted in the main body portion 16 and the tapered seat surface of the auxiliary washer 18 face each other, and the tapered shape of the seal portion 17 is accompanied by the tightening of the bolt 1 and the nut 2. Is pressed against the tapered seat surface of the auxiliary washer 18, and by this pressure contact, the seal portion 17 is displaced toward the axial portion of the bolt 1, and the seal portion 17 and the surface of the bolt 1 facing each other are in close contact with each other. To be done. Since the outer diameter of the auxiliary washer 18 is larger than the outer diameter of the seal portion 17, the peripheral edge portion of the auxiliary washer 18 does not sink into the seal portion 17 and is not damaged. The tip of the auxiliary washer 18 is cut off or formed in an arc shape in order to eliminate the sharpness.

As the tapered lower surface of the seal portion 17 and the tapered seat surface of the auxiliary washer 18 come into close contact with each other in this manner, fluid is transferred from the contact surface between the seat surface of the nut 2 and the lower surface of the other fixed member 5. Leaks into the shaft 1 of the bolt 1 and the gap 14 of the washer 15 with a seal, and even if this fluid reaches the contact surface between the lower surface of the seal portion 17 and the surface of one of the fixed members 4, the fluid leaks. There is no such thing.

[0019]

As described above, according to the present invention, the seal portion is provided on the surface of the fixed member and the lower surface of the head portion of the bolt at the one side portion projecting in the axial direction of the bolt from the seat surface of the main body portion. Since it contacts with either the lower surface of the nut or the lower surface of the nut, even if the fluid enters from the contact surface between the nut and the fixed member, the fluid does not leak to the outside. Furthermore, since the surfaces of the auxiliary washer and the seal portion that face each other come into close contact with each other as the bolt and the nut are tightened, and the seal portion is pressed against the bolt, the sealability is further improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a washer with a seal according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view of a washer with a seal according to a second embodiment.

FIG. 3 is a partial cross-sectional view of a conventional washer with a seal.

[Explanation of symbols]

 1 Bolt 2 Nut 3 Fixed member 6 Head 7 Seal washer 8 Body 9 Seal part 10 Large hole 12 Hole 15 Seal washer 16 Body 17 Seal part 18 Auxiliary washer 20 Large hole

Claims (2)

[Claims] 1. When fastening a fixed member with a bolt and a nut, it is interposed between the surface of the fixed member to be fastened and the lower surface of the head of the bolt or between the surface of the fixed member and the lower surface of the nut. The washer includes a main body portion having a large hole portion for inserting the shaft portion of the bolt, and a seal portion made of an elastic material, which is fitted in the large hole portion of the main body portion, and the seal portion is the shaft portion of the bolt. One side part that has a larger diameter bolt insertion hole and projects in the axial direction of the bolt from the seating surface of the main body contacts either the surface of the fixed member, the lower surface of the bolt head or the lower surface of the nut. A washer with a seal characterized in that 2. An auxiliary washer having a hole that is inserted into the large hole of the main body and inserts the shaft of the bolt is provided, and the surfaces of the auxiliary washer and the seal that face each other are the axial center of the bolt. A concentric tapered shape is formed.
Washer with seal as described.