JP2018184967A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure which can inhibit damage caused to a seal lip of a sealing device while reducing the number of components of the sealing device.SOLUTION: A sealing device body part 200 includes: a cylindrical member side seal lip 220 which adheres to an outer peripheral surface of a brake drum cylinder so as to enclose a periphery of an opening of a through hole and in which diameters at the outer peripheral surface 221 side and the inner periphery surface 222 side are reduced toward the outer peripheral surface of the brake drum cylinder; and a passage formation member side seal lip 230 which adheres to a valve body so as to enclose a periphery of an opening of a passage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing structure including a cylindrical sealing device in which a cylinder serves as a fluid passage.

  In the automatic transmission, in order to prevent leakage of ATF (automatic transmission fluid) supplied to the brake drum cylinder, a cylindrical sealing device (drum seal) in which the inside of the cylinder serves as an ATF passage is provided. With reference to FIG.4 and FIG.5, the sealing device and sealing structure which concern on a prior art example are demonstrated. FIG. 4 is a partially broken sectional view of a conventional sealing device. FIG. 5 is a schematic cross-sectional view of a conventional sealing structure.

  The automatic transmission is provided with a valve body 500 in which a fluid (ATF) flow path 510 is formed, and a cylindrical brake drum cylinder 600 having a through hole 610 penetrating from the outer peripheral surface side toward the inner peripheral surface side. It has been. A transmission case 700 is provided between the valve body 500 and the brake drum cylinder 600. An attachment hole 750 is provided in the transmission case 700. A cylindrical sealing device (drum seal) 800 is attached to the attachment hole 750.

  The sealing device 800 includes a reinforcing ring 810 made of metal, resin, or the like, and a sealing device body 820 made of a rubber-like elastic body provided integrally with the reinforcing ring 810. The sealing device main body 820 is provided with a seal lip 821 extending toward the side opposite to the reinforcing ring 810 side. The sealing device 800 configured as described above is attached to the attachment hole 750 provided in the transmission case 700, and the seal lip 821 extends around the opening portion of the through hole 610 with respect to the outer peripheral surface of the brake drum cylinder 600. Adhere closely. In addition, a seal ring 900 made of a rubber-like elastic body is attached to the rear end side of the reinforcing ring 810. The seal ring 900 seals the gap between the valve body 500 and the transmission case 700.

  With the above configuration, a flow path is formed from the flow path 510 provided in the valve body 500 through the inside of the cylinder of the sealing device 800 to the inside of the brake drum cylinder 600 from the through hole 610. The sealing device 800 and the seal ring 900 can prevent fluid from leaking from the flow path.

  Here, the inner peripheral surface of the seal lip 821 according to the conventional example has a multistage structure in which the diameter is gradually increased toward the tip. As a result, the seal lip 821 is deformed so as to increase in diameter when it comes into close contact with the surface of the brake drum cylinder 600, and is in close contact at a plurality of locations, so that it has excellent adhesion.

  However, there is a gap S between the brake drum cylinder 600 and the transmission case 700 due to the structure. Therefore, the tip of the seal lip 821 may protrude into the gap S. As a result, the tip of the seal lip 821 may be damaged and the sealing performance may be reduced. Further, in the sealing structure according to the conventional example, two types of sealing devices, that is, the sealing device 800 and the seal ring 900 are required to prevent fluid leakage.

JP-A-9-32927

  The objective of this invention is providing the sealing structure which can suppress that a seal | sticker lip of a sealing device is damaged, reducing the number of parts of a sealing device.

  The present invention employs the following means in order to solve the above problems.

A flow path forming member in which a fluid flow path is formed;
A cylindrical member having a through-hole penetrating from the outer peripheral surface side toward the inner peripheral surface side;
A cylindrical sealing device that forms a cooperative passage that connects the flow path and the through hole inside the cylinder,
A to-be-attached member provided between the flow path forming member and the cylindrical member and having an attachment hole to which the sealing device is attached;
A sealing structure comprising:
The sealing device includes:
A reinforcement ring,
A sealing device body made of a rubber-like elastic body provided integrally with the reinforcing ring;
With
The sealing device body is
A cylinder that is in close contact with the outer peripheral surface of the cylindrical member so as to surround the periphery of the opening of the through-hole, and that both the outer peripheral surface side and the inner peripheral surface side decrease in diameter toward the outer peripheral surface of the cylindrical member. A member-side seal lip;
A flow path forming member-side seal lip that is in close contact with the flow path forming member so as to surround the periphery of the opening of the flow path,
It is characterized by providing.

  According to the present invention, the sealing device body is provided with the cylindrical member side seal lip and the flow path forming member side seal lip. Therefore, the leak of the fluid which flows through the flow path from the flow path of the flow path forming member to the through hole of the cylindrical member can be suppressed by one sealing device. The cylindrical member-side seal lip is configured so that the outer peripheral surface side and the inner peripheral surface side are reduced in diameter toward the outer peripheral surface of the cylindrical member. Thereby, the front-end | tip of a cylindrical member side seal lip deform | transforms so that it may bend toward radial inside. Therefore, it can suppress that the front-end | tip of the cylindrical member side seal lip protrudes in the clearance gap between a to-be-attached member and a cylindrical member.

  As described above, according to the present invention, it is possible to prevent the sealing lip of the sealing device from being damaged while reducing the number of parts of the sealing device.

FIG. 1 is a partially broken cross-sectional view of a sealing device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a sealing structure according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a sealing structure according to an embodiment of the present invention. FIG. 4 is a partially broken sectional view of a conventional sealing device. FIG. 5 is a schematic cross-sectional view of a conventional sealing structure.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. . In this embodiment, a sealing structure including a sealing device (drum seal) for preventing leakage of ATF (automatic transmission fluid) supplied to a brake drum cylinder will be described as an example in an automatic transmission.

(Example)
With reference to FIGS. 1-3, the sealing structure which concerns on the Example of this invention is demonstrated. FIG. 1 is a partially broken cross-sectional view of a sealing device according to an embodiment of the present invention. In addition, the sealing device according to the present embodiment has a rotationally symmetric shape, and FIG. 1 shows a diagram in which a part of the sealing device is cut along a plane including the central axis of the sealing device. 2 and 3 are schematic cross-sectional views of the sealing structure according to the embodiment of the present invention. In the sealing structure according to the present embodiment, a cylindrical member (brake drum cylinder 600) is provided. FIG. 2 shows a part of a sectional view of the sealing structure cut along a plane perpendicular to the central axis of the cylindrical member and including the central axis of the sealing device. FIG. 3 shows a part of a cross-sectional view of the sealing structure cut along the plane including the central axis of the cylindrical member and the plane including the central axis of the sealing device.

<Sealing structure>
The sealing structure according to the present embodiment will be described. The sealing structure according to this embodiment includes a valve body 500 as a flow path forming member in which a fluid (ATF) flow path 510 is formed, and a through hole 610 penetrating from the outer peripheral surface side toward the inner peripheral surface side. A brake drum cylinder 600 as a cylindrical member is provided. In addition, the sealing structure according to the present embodiment also includes a cylindrical sealing device 10 serving as a cooperative passage that connects the flow path 510 and the through hole 610 in the cylinder. Furthermore, the sealing structure according to the present embodiment also includes a transmission case 700 as an attached member that is provided between the valve body 500 and the brake drum cylinder 600 and has an attachment hole to which the sealing device 10 is attached. . The transmission case 700 according to the present embodiment includes a first case 710 on the brake drum cylinder 600 side and a second case 720 on the valve body 500 side. Both the first case 710 and the second case 720 are provided with mounting holes 711 and 721 of the sealing device 10. The inner diameter of the mounting hole 721 is slightly larger than the inner diameter of the mounting hole 711.

  With the above configuration, a flow path from the flow path 510 of the valve body 500 through the cylinder of the sealing device 10 to the through hole 610 of the brake drum cylinder 600 is formed. As a result, fluid (ATF) is supplied from the valve body 500 side to the inside of the brake drum cylinder 600 (see arrow A in FIGS. 1 and 2).

<Sealing device>
In particular, the sealing device 10 according to the present embodiment will be described with reference to FIG. The sealing device 10 according to the present embodiment includes a reinforcing ring 100 made of a highly rigid material such as metal or resin, and a sealing device main body 200 made of a rubber-like elastic body provided integrally with the reinforcing ring 100. Composed. For example, the sealing device 10 can be obtained by molding the sealing device main body 200 by insert molding using the reinforcing ring 100 as an insert molding component. The inside of the inner peripheral surface 210 of the sealing device main body 200 is a fluid passage (cooperative passage).

The sealing device main body 200 includes a cylindrical member-side seal lip 220 that is in close contact with the brake drum cylinder 600 and a flow path forming member-side seal lip 230 that is in close contact with the valve body 500. The cylindrical member side seal lip 220 is in close contact with the outer peripheral surface of the brake drum cylinder 600 so as to surround the periphery of the opening of the through hole 610. The cylindrical member-side seal lip 220 is configured such that both the outer peripheral surface 221 side and the inner peripheral surface 222 side thereof are reduced in diameter toward the outer peripheral surface of the brake drum cylinder 600. The flow path forming member side seal lip 230 is in close contact with the valve body 500 so as to surround the periphery of the opening of the flow path 510. The inner peripheral surface 231 of the flow path forming member side seal lip 230 is configured to increase in diameter toward the surface of the valve body 500.

  The sealing device 10 configured as described above is attached to the mounting holes (the mounting hole 711 of the first case 710 and the mounting hole 721 of the second case 720) provided in the transmission case 700 as described above. Thereby, a part of the outer peripheral surface of the reinforcing ring 100 in the sealing device 10 and a part of the outer peripheral surface of the sealing device main body 200 are in close contact with the inner peripheral surface of the mounting hole 711 of the first case 710. Further, the cylindrical member side seal lip 220 in the sealing device main body 200 is in close contact with the outer peripheral surface of the brake drum cylinder 600 in a state of being deformed so as to bend radially inward. Further, the flow path forming member side seal lip 230 has its tip closely attached to the valve body 500, and its outer peripheral surface is the inner peripheral surface of the mounting hole 711 of the first case 710 and the mounting hole 721 of the second case 720. It adheres closely to the inner peripheral surface of.

<Excellent point of sealing structure according to this embodiment>
According to the sealing structure according to the present embodiment, the sealing device main body 200 of the sealing device 10 is provided with the cylindrical member side seal lip 220 and the flow path forming member side seal lip 230. Therefore, the leakage of the fluid (ATF) flowing through the flow path from the flow path 510 of the valve body 500 to the through hole 610 of the brake drum cylinder 600 can be suppressed by the single sealing device 10.

  Further, the cylindrical member side seal lip 220 is configured so that the outer peripheral surface 221 side and the inner peripheral surface 222 side are reduced in diameter toward the outer peripheral surface of the brake drum cylinder 600. Thereby, the front-end | tip of the cylindrical member side seal lip 220 deform | transforms so that it may bend toward radial inside. Therefore, it is possible to suppress the tip of the cylindrical member-side seal lip 220 from protruding into the gap between the transmission case 700 and the brake drum cylinder 600.

DESCRIPTION OF SYMBOLS 10 Sealing device 100 Reinforcement ring 200 Sealing device main body part 210 Inner peripheral surface 220 Cylindrical member side seal lip 221 Outer peripheral surface 222 Inner peripheral surface 230 Flow path forming member side seal lip 231 Inner peripheral surface 500 Valve body 510 Flow path 600 Brake drum Cylinder 610 Through hole 700 Transmission case 710 First case 720 Second case 711, 721 Mounting hole

Claims (1)

A flow path forming member in which a fluid flow path is formed;
A cylindrical member having a through-hole penetrating from the outer peripheral surface side toward the inner peripheral surface side;
A cylindrical sealing device that forms a cooperative passage that connects the flow path and the through hole inside the cylinder,
A to-be-attached member provided between the flow path forming member and the cylindrical member and having an attachment hole to which the sealing device is attached;
A sealing structure comprising:
The sealing device includes:
A reinforcement ring,
A sealing device body made of a rubber-like elastic body provided integrally with the reinforcing ring;
With
The sealing device body is
A cylinder that is in close contact with the outer peripheral surface of the cylindrical member so as to surround the periphery of the opening of the through-hole, and that both the outer peripheral surface side and the inner peripheral surface side are reduced in diameter toward the outer peripheral surface of the cylindrical member. A member-side seal lip;
A flow path forming member-side seal lip that is in close contact with the flow path forming member so as to surround the periphery of the opening of the flow path,
A sealing structure comprising:

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