JPH04122895U - gasket - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce assembly man-hours and improve sealing performance. [Structure] A disc-shaped base with a central hole, a sealing surface facing the surface of the mating member, a pressed surface facing the presser plate on the back side of the sealing surface, and a center axis of the base as it moves toward the mating member. a ring-shaped lip part that extends along the entire circumference along the outer peripheral edge of the base, and a ring-shaped lip part that extends along the entire circumference along the outer peripheral edge of the base; When the holding plate presses the base toward the opposing member and the lip portion elastically deforms and comes into elastic contact with the opposing member, the stepped portion comes into contact with the side peripheral surface of the holding plate, thereby forming a lip. A gasket characterized by having a structure that maintains the rigidity of the parts.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a gasket used in fluid couplings and the like.

0002

[Conventional technology]

A fuel tank is used to transport fuel from a car's fuel tank to the engine through a tube. For example, the structure shown in Fig. 4 is known as a joint structure for connecting a link and a tube. There is. This joint structure includes a fuel tank 100, a joint 200, and a gasket 300. The gasket 300 is sandwiched between the fuel tank 100 and the joint 200. has been done.

0003 The joint 200 has a base body 201 that has an eyepiece 202 built therein, and a base body 201 that is concentrically connected to the base body 201. A petri dish-shaped holding plate 203 provided and a tube connected to the eyeball part 202 204, and is fixed to the fuel tank 100 with a hole bolt 205. Ru. In addition, between the base body 201 and the fuel tank 100, and between the base body 201 and the hole bolt Copper packings 206 and 207 are interposed between the head 205 and the head. stop The fuel tank 100, hole bolt 205, centerpiece 202 and tube 204 are A flow path is formed by communicating with each other.

0004 The copper packings 206 and 207 function as primary seals, and the gasket 30 0 is used as a secondary seal. This gasket 300 is as shown in FIG. It has a flat disk shape and a ring shape on the side of the sealing surface 301 that comes into contact with the fuel tank 100. A ring-shaped groove 303 is formed on the opposite surface. Furthermore, a ring-shaped notch 304 is formed at the peripheral edge on the sealing surface 301 side. Ru. Then, the end of the presser plate 203 is engaged with the ring-shaped groove 303 and the fuel tank is closed. 100, and the seal protrusion 302 comes into elastic contact with the surface of the fuel tank 100. It is sealed. Further, a sealing tape 305 is placed in the notch 304. , is attached to both sides of the gasket 300 and the fuel tank 100, and the seal is attached to that part as well. has been recorded.

[0005] In this way, the gasket 300 prevents dust and water from entering the flow path. ing.

[0006]

[Problem that the idea aims to solve]

To assemble the above joint structure, first, cut out the notch 3 on the peripheral edge of the gasket 300. At this time, the seal tape 305 is pasted on 04. Wrinkles may appear on the skin. If this happens, the sealing performance will deteriorate and rust etc. Since defects may occur, inspection after applying the seal tape is required, which requires a large amount of man-hours. ing.

[0007] This invention was made in view of these circumstances, and it does not use sealing tape. The purpose is to create a structure that can be stably sealed with both.

[0008]

[Means to solve the problem]

The gasket of the present invention that solves the above problems is made of a disk-shaped material with a central hole, rather than a soft material. A gasket that is formed and sandwiched between a mating member and a holding plate for sealing. , The sealing surface facing the mating member surface and the covering facing the presser plate on the back side of the sealing surface. A disc-shaped base with a pressing surface and a center hole, and a base that has a pressing surface and a center hole. Along the outer periphery of the protruding base, the distance from the central axis increases. A ring-shaped lip part that extends around the entire circumference, and is continuous with the lip part and from the pressed surface. Consisting of a ring-shaped step protruding approximately in the axial direction, The presser plate presses the base toward the mating member, and the lip portion elastically deforms and presses against the mating member. When the step part comes into elastic contact with the side circumferential surface of the holding plate, the stiffness of the lip part is increased. It is characterized by a structure that maintains its gender.

[0009] One feature of the present invention is the lip portion. In other words, the lip part and the sealing surface It has a dish shape and protrudes diagonally toward the mating member from the periphery of the sealing surface. Ru. Therefore, when pressed by the mating member, the lip part is flush with the sealing surface. It deforms elastically so that it comes into contact with the mating member due to its elastic force, generating a sealing force. do.

0010 Another feature of the present invention is that the lip part is continuous with the lip part and is approximately parallel to the pressed surface. It has a ring-shaped step that protrudes in the axial direction and comes into contact with the side surface of the holding plate. . This step comes into contact with the side circumferential surface of the holding plate, preventing excessive deformation of the lip. It is prevented and rigidity is added, and it is pressed against the mating member with a large force, resulting in an even higher seal. You can get the same flexibility.

[0011]

[Function and effect of the idea]

In the gasket of this invention, the holding plate presses the pressed surface and the sealing surface touches the mating member. When approached, the tip of the lip portion first comes into contact with the mating member. and even more pressure The lip part elastically deforms in the direction of diameter expansion, and the tip of the lip part Comes into elastic contact with the member.

0012 On the other hand, as the lip portion deforms, the step portion tends to deform in a direction that reduces its diameter. vinegar Then, the stepped portion is in contact with the side circumferential surface of the presser plate, and further deformation is restricted. Therefore, in that state, the lip part is given rigidity, and the elastic force is further increased by the step part. A reaction force is also applied to maintain the state of pressure contact with the mating member. This makes the lip larger. It is pressed against the mating member with a strong force, creating a high sealing force.

[0013] Therefore, according to the gasket of the present invention, high sealing performance can be stably and reliably obtained. This eliminates the need for sealing tape and avoids problems caused by sealing tape. Ru. In other words, there is no deterioration in sealing performance due to defects when applying the seal tape, so inspection is possible. This eliminates the need for man-hours.

[0014]

【Example】 Hereinafter, this will be explained in detail using examples. FIG. 1 shows a gasket according to an embodiment of the present invention. This gasket has a base 1 and It is composed of a lip part 2 and a step part 3, and is integrally formed from NBR rubber. .

[0015] The base 1 is formed into a disk shape with a center hole 10, and one surface is a cylinder facing the mating member. The sealing surface 11 has a pressed surface 12 opposite to the pressing plate on the opposite surface of the sealing surface 11. It is formed. The sealing surface 11 has an axially protruding part that is concentric with the center hole 10. A ring-shaped seal protrusion 13 is formed. At the outer peripheral edge of the base 1, as it goes from the sealing surface 11 toward the mating member side, the base 1 protrudes at an incline such that the distance from the central axis increases, and the entire circumference extends along the outer periphery. A ring-shaped lip portion 2 is formed extending into the ring. That is, the base part 1 and the lip part 2 It is approximately dish-shaped.

[0016] The outer peripheral edge on the side of the pressed surface 12 is continuous with the lip portion 2 and has a pressed surface. A ring-shaped step portion 3 is formed that protrudes from the surface 12 in a substantially axial direction. Lip part 2 The side circumferential surface of the stepped portion 3 has a continuous truncated conical side circumferential surface shape. The gasket of this embodiment configured as described above is connected to the joint 4 as shown in FIG. It is interposed between the fuel tank 5. The joint 4 includes a base body 40 having a built-in eyepiece portion 41; A plate-shaped pressing plate 42 is provided concentrically on the base body 40 and is connected to the eyeball part 41. It consists of a tube 43 and is fixed to the fuel tank 5 with a hole bolt 44. Ru. Note that between the base body 40 and the fuel tank 5, and between the base body 40 and the head of the hole bolt 44, Copper packings 45 and 46 are interposed between the parts. and fuel tank 5 , the hole bolt 44, the eyepiece 41, and the tube 43 communicate with each other to form a flow path. There is. The holding plate 42 has a relatively thick brim shape and is flat and concentric with the outer peripheral surface of the base body 40. It has a side circumferential surface 47 with a straight line. Note that the outer diameter of the side circumferential surface 47 is slightly smaller than the inner diameter of the stepped portion 3. It is configured.

[0017] In the gasket of this embodiment configured in this way, the base of the joint 4 is inserted into the center hole 10. 40 is inserted, and the joint 4 and fuel tank 5 are fixed together with the hole bolt 44. be done. At this time, a copper packing 45 and a gasket are placed between the joint 4 and the fuel tank 5. is interposed between the joint 4 and the bolt 44, and a copper packing 46 is interposed between the joint 4 and the bolt 44. At this time, the pressing plate 42 first comes into contact with the pressed surface 12, and the tip of the lip portion 2 It comes into contact with tank 5. Then, by screwing the bolt 44, the holding plate 42 burns the base 1. When pressed toward the material tank 5, the lip portion 2 is elastically deformed so that its tip expands in diameter. do. On the other hand, the stepped portion 3 collapses toward the inner circumferential side as the lip portion 2 deforms. child As a result, the inner circumferential surface of the stepped portion 3 comes into contact with the side circumferential surface 47 of the holding plate 42.

[0018] When the bolt 44 is further screwed on, the inner circumferential surface of the lip portion 2 becomes the sealing surface 11. The seal protrusion 13 comes into elastic contact with the fuel tank 5 to seal it. On the other hand, the stepped portion 3 is pressed against the side circumferential surface 47 of the holding plate 42 and its movement is restricted. Then, the reaction force from the presser plate 42 acts on the lip portion 2 via the stepped portion 3, and the lip portion 2 is strongly pressed against the surface of the fuel tank 5 by its own elastic reaction force and the reaction force of the holding plate 42. This results in high sealing force. In addition, the pressure of the holding plate 42 is applied directly to the seal protrusion 13. Therefore, a high sealing force can be obtained between the seal protrusion 13 and the fuel tank 5. It will be done.

[0019] Therefore, according to the gasket of this embodiment, the lip portion 2 and the seal protrusion 13 A strong double seal ensures that dust and water do not enter. See you again Since seal tape is not required, sealing performance will not deteriorate due to poor adhesion of seal tape. This also reduces the number of steps required for pasting. As shown in FIG. 3, if a ring-shaped groove 30 is formed adjacent to the step 3, A conventional joint 200 shown in FIG. 4 may also be used. In this case, presser plate 2 The tip of the peripheral edge of 03 engages with the groove 30, and the pressing plate 203 presses the bottom of the groove 30. do. Then, due to the elastic deformation of the lip portion 2, the step portion 3 collapses toward the groove portion 30. It is pressed against the end of the pressing plate 203 to seal it.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a gasket according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the gasket of FIG. 1 in use.

FIG. 3 is a sectional view of a gasket according to another embodiment.

FIG. 4 is a sectional view of a conventional gasket in use.

FIG. 5 is a cross-sectional view of a conventional gasket.

[Explanation of symbols]

1: Base 2: Lip 3: Step 4: Joint 5: Fuel tank 10: Center hole 11: Seal surface 12: Pressed surface 13:
seal protrusion

Claims (1)

[Scope of utility model registration request] Claim 1: A gasket formed from a soft material into a disk shape with a central hole and sandwiched between a mating member and a holding plate for sealing, the sealing surface facing the mating member surface and the sealing surface. a disc-shaped base having a central hole and a pressed surface facing the pressing plate on the back side of the disc; It consists of a ring-shaped lip part that protrudes and extends all the way along the outer peripheral edge of the base part, and a ring-shaped step part that is continuous with the lip part and projects from the pressed surface in a substantially axial direction, When the presser plate presses the base toward the mating member and the lip portion is elastically deformed and comes into elastic contact with the mating member, the step portion comes into contact with the side peripheral surface of the presser plate, thereby causing the lip A gasket characterized by having a structure that maintains the rigidity of the parts.