JPH0594576U - Sealing device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent damage to the seal lip and improve the sealing performance. [Structure] The flange 1 that reaches the fitting portion 6 up to the position of the support ring 13 and the lip tip 15 of the radial seal lip 8.
4A and a peripheral wall 14B that extends from the tip of the flange 14A to the position of at least the lip tip 15 of the axial seal lip 8 and is a flexible seal lip protector 1
It is characterized by wearing 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device such as an oil seal used in a shaft sealing portion of various devices, and more particularly to a sealing device provided with a means for protecting a seal lip.

[0002]

[Prior Art]

 As a conventional sealing device of this type, there is one as shown in FIGS. The sealing device 100 seals a ring-shaped gap between two members which are concentrically and relatively movable to each other.

The sealing device 100 shown in FIG. 4 is formed by integrally molding a rubber-like elastic seal body 101 and a metal ring 102. The seal main body 101 has a cylindrical fitting portion 103 provided with an inward flange 104, and an inner peripheral wall provided with a seal lip 105 and a dust lip 106 extending in the axial direction. A groove 107 is provided, and a spring 108 is mounted in the groove 107. In FIG. 5, protrusions 109 are provided at both open ends of the groove 107, which is a spring holder, so as to enclose the spring 108.

[0004]

[Problems to be solved by the device]

 However, the protrusions 109 provided at both open ends of the groove 107, which is the spring holder portion, do not enclose the entire spring 108, so that a sufficient effect cannot be obtained against the spring 108 coming off.

Therefore, it has a spline part 110 as shown in FIG. 6, and the spline part 110 is mounted on a shaft 112 provided with a stop ring groove 111 for mounting a stop ring (not shown). After removing the shaft 112, if the shaft 112 is eccentric, the seal lip 105 interferes with the spline portion 110 of the shaft 112 and the stop ring groove 111, so-called contact, and the stop ring groove 111 seals. 105 is caught, which causes the seal lip 105 to deform and the spring 108 to come off.

Further, the seal lip 105 is damaged.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sealing device capable of preventing damage to a seal lip and improving sealing performance. To do.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention seals an annular gap between two members which are concentrically and relatively movable to each other, and is a cylinder fitted to one member. In a sealing device having a ring-shaped fitting portion and a seal lip that comes into sealing contact with the other member, the fitting portion includes a support ring and a flange that has reached the position of the lip tip of the radial seal lip. , A peripheral wall that reaches from the tip of the flange to at least the lip tip of the axial seal lip, and a flexible seal lip protector for protecting the seal lip is attached, and the seal lip protector bends. Thus, the end face of the peripheral wall comes into contact with the end face of the other of the above-mentioned two members, so that the seal lip is in sealing contact with the other member.

[0009]

[Action]

 In the sealing device having the above-mentioned configuration, since the flexible seal lip protector for protecting the seal lip which is in sealing contact with the other member of the two members concentrically and relatively movable is installed, The seal lip is protected from damage by the peripheral wall of the seal lip protector before the insertion between the two members and when the other member is removed after mounting the sealing device.

Further, at the time of mounting, since the end surface of the peripheral wall comes into contact with the end surface of the other member due to the bending of the seal lip protector, the seal lip comes into sealing contact with the other member and is sealed. There is no problem due to the provision of the seal lip protector.

[0011]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 and 2 showing a sealing device according to an embodiment of the present invention, the sealing device 1 is an annular member between a housing 2 and a spline shaft 3 which are two members that are concentrically movable relative to each other. It seals the gap.

The sealing device 1 is formed by integrally molding a rubber-like elastic seal body 4 and a metal ring 5, and the seal body 4 is a cylindrical fitting portion 6 that fits on the inner peripheral surface of the housing 2. Since the inward flange 7 is continuously connected to the inner side of the inner peripheral end thereof, the seal lip 8 extending toward the fluid O to be sealed in the axial direction and the dust lip 9 extending radially inward toward the atmosphere A are provided. A groove 10 is provided on the outer circumference of the seal lip 8, and a spring 11 is attached to the groove 10. A flexible seal lip protector 12 for protecting the seal lip 8 is fitted and assembled on the inner periphery of the fitting portion 6.

The seal lip protector 12 includes a metal support ring 13 and a rubber-like elastic member 14 having an L-shaped cross section, and the rubber-like elastic member 14 is baked on the support ring. .. The support ring 13 has substantially the same length as the cylindrical portion 51 of the metal ring 5 and is thinner than the metal ring 5, and a step is provided on the support ring cylindrical portion 13A of the support ring 13 near the fluid to be sealed side O. On the radially inner side slightly, a support ring inward inward in the radial direction 13B is continuously provided at the tip thereof to cover the support ring inward flange 13B and to seal the fluid to be sealed in the support ring cylindrical portion 13A. A support ring rubber-like elastic member 13C is baked on the outer peripheral surface near the side O.

A rubber-like elastic member 14 having an L-shaped cross section is baked on the inner peripheral end of the support-ring inward flange 13B via a support-ring rubber-like elastic member 13C. The rubber-like elastic member 14 has a flange 14A which has almost the same thickness as the support ring 13 in the free state and which has reached from the inner peripheral end of the support ring inward flange 13A to the position of the lip tip 15 of the radial seal lip 8. The peripheral wall 14B extends from the tip of the flange 14A to the position of the lip tip 15 of the seal lip 8 on the atmospheric side A in the axial direction, and there is a gap between the end surface of the peripheral wall 14B and the lip tip 15. Further, the peripheral wall 14B has notches 16 which are evenly distributed and reach almost half of the flange 14A.

Further, a groove 17 having a semicircular cross section is provided on the atmosphere side A of the connecting portion of the rubber elastic member 13C of the support ring 13 and the rubber elastic body 14 having an L cross section, and the groove 17 having an L cross section is provided. The rubber-like elastic body 14 is designed to be easily bent.

Next, the work of assembling the sealing device 1 to the spline shaft 3 as shown in FIG. 2 will be described.

The spline shaft 3 is composed of a large-diameter portion corresponding to the seal lip, which is in sealing contact with the seal lip 8, and a small-diameter portion spline portion 3C having a step portion 3B. 3C is provided with a stop ring groove 3D for mounting a stop ring (not shown).

The length of the flange 14A of the seal lip protector 12 is smaller than the diameter of the seal lip corresponding shaft portion 3A and larger than the diameter of the step portion 3B of the spline portion 3C, and the peripheral wall 14B is the lip tip of the seal lip 8. It is located on the inner diameter side from 15.

When the spline shaft 3 is inserted into the sealing device 1 from the atmosphere side A, the end surface of the peripheral wall 14B of the seal lip protection device 12 abuts on the end surface of the seal lip corresponding shaft portion 3A, and further the spline shaft 3 is attached. When the rubber-like elastic body 14 having an L-shaped cross section is inserted so as to be assembled in a regular position, the rubber-like elastic body 14 is bent toward the fluid O to be sealed and separated from the seal lip 8. Therefore, the peripheral wall 14B is hooked on the end surface of the seal lip corresponding shaft portion 3A, and there is no remaining between the seal lip 8 and the seal lip corresponding shaft portion 3A. The sealing device 1 is assembled by sealingly contacting the outer peripheral surface. Further, since the rubber-like elastic member 14 is provided with the notch 16, it is possible to ensure the lubrication of the lip tip 15 of the seal lip 8.

In the sealing device having the above structure, when the spline shaft 3 is pulled out, the spline portion 3 C of the spline shaft 3 is pulled out in such a manner that it interferes with the seal lip 8 due to misalignment. At this time, as shown in FIG. 3, the peripheral wall 14B of the seal lip protector 12 interferes between the seal lip 8 and the spline portion 3C, so that the spline portion 3C of the spline shaft 3 and the stop ring groove 3D are sealed. Since it does not come into direct contact with the seal 8, the seal lip 8 is prevented from being damaged and the sealability can be improved.

Further, since the seal lip 8 does not get caught in the stop ring groove 3D as shown in the prior art, the seal lip 8 does not deform, so that the spring 11 does not come off.

[0022]

[Effect of the device]

 The present invention has the above-described configuration and operation, and is a flexible seal lip protection that protects a seal lip that comes into sealing contact with the other member out of two members that are assembled concentrically relative to each other. Since the tool is provided, the peripheral wall of the seal lip protector protects the seal lip before inserting it between the two members or after removing the other member after mounting the sealing device, so that the seal lip is not damaged. Therefore, the sealing property is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a sealing device according to an embodiment of the present invention.

2 is a longitudinal sectional view showing a state in which the sealing device of FIG. 1 is assembled to a spline shaft.

3 is a vertical cross-sectional view showing a state in which the spline shaft of FIG. 2 is pulled out to the atmosphere side.

FIG. 4 is a vertical sectional view of a conventional sealing device.

FIG. 5 is a vertical cross-sectional view of another conventional sealing device.

6 is a longitudinal sectional view showing a state in which a seal lip of the sealing device of FIG. 4 is caught in a stop ring groove.

[Explanation of symbols]

 1 Sealing Device 2 Housing 3 Spline Shaft 3A Seal Lip Corresponding Shaft Part 3B Step Part 3C Spline Part 3D Stop Ring Groove 4 Seal Main Body 5 Metal Ring 51 Cylindrical Part 6 Fitting Part 7 Inward Flange 8 Seal Lip 9 Dustrip 10, 17 Groove 11 Spring 12 Seal lip protector 13 Support ring 13A Support ring cylindrical portion 13B Support ring inward flange 13C Support ring Rubber-like elastic member 14 Rubber-like elastic member 14A Flange 14B Circumferential wall 15 Lip tip 16 Notch

Claims (1)

[Scope of utility model registration request] 1. A seal for sealing an annular gap between two members which are concentrically and relatively movable to each other.
In a sealing device having a cylindrical fitting portion fitted to one member and a seal lip sealingly contacting the other member, the fitting portion includes a support ring and a lip tip of a radial seal lip. A flexible seal lip protector for protecting the seal lip, which includes a flange reaching the position and a peripheral wall reaching from the tip of the flange to the position of at least the lip tip of the axial seal lip, is mounted. The sealing device is characterized in that the end face of the peripheral wall comes into contact with the end face of the other member of the two members due to the bending of the protector, whereby the seal lip is in sealing contact with the other member.