JPH058134U - Shaft seal device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts, improve workability and assembling, and also remove the dust seal. [Structure] A locking lip inclined outward is provided at the outer end of the dust seal, and this locking lip is engaged with the inner circumference of the housing, and the resistance of the locking lip prevents the dust seal from coming off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shaft sealing device for an actuator such as a hydraulic cylinder.

[0002]

[Prior Art]

 As a shaft sealing device for this type of conventional hydraulic cylinder, which is an actuator, for example, the one shown in FIG. 5 has been developed.

This is because a bearing 2 as a housing is provided in a cylinder 1, a piston rod 3 as a rod is slidably inserted into the cylinder 1 via a piston, and a dust seal 10 provided at an inner circumference of a bearing 2 is provided. The dust lip 11 and the oil lip 12 slidably contact the outer periphery of the piston rod 3 to prevent dust from entering and prevent oil from leaking.

The dust lip 10 has an outer periphery protected by a metal ring 13, and a stopper 14 installed on the inner periphery of the bearing 2 prevents the dust lip 10 from coming off.

[0005]

[Problems to be solved by the device]

 However, in the shaft sealing device described above, since the engaging groove 15 is formed in the inner periphery of the bearing 2 to provide the stopper 14, and the stopper 14 is fitted in the engaging groove 15, the number of parts is large, Grooving is difficult, two assembling operations of the dust seal 10 and the stopper 14 are required, and the economy, workability, and assemblability are poor.

Therefore, an object of the present invention is to provide a shaft sealing device which has a small number of parts, does not require grooving, improves the assembling property, and at the same time prevents the dust seal from coming off.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the structure of the present invention is a shaft sealing device in which a rod is slidably inserted into a housing, and a dust lip of a dust seal provided on the inner circumference of the housing is slidably contacted with the outer circumference of the rod. The feature is that a locking lip inclined outward is provided at the outer end of the dust seal, and the locking lip is engaged with the inner circumference of the housing.

[0008]

[Action]

 When the rod slides on the dust seal, or when internal pressure acts and an outward force is applied to the dust seal, the locking lip pulls against the inner circumference of the housing, causing resistance opposite to the removal direction and causing a dust seal. Prevention of omission is achieved.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a shaft sealing device for a hydraulic cylinder as an actuator according to an embodiment of the present invention.

A piston rod 3 is slidably inserted into a bearing 2 which is a housing in a cylinder 1 through a piston, and a dust seal 10, an oil seal O and a bush B are provided on the inner periphery of the bearing 2 to provide a dust seal. 10, the oil seal O and the bush B are in sliding contact with the outer circumference of the piston rod 3, and the main body 10a of the dust seal 10 is provided with a dust lip 11 for preventing dust from entering and an oil lip 12 for preventing oil from leaking. There is.

The dust seal 10 is fitted in the inner peripheral groove 16 provided in the bearing 2, and the outer periphery thereof is reinforced by the metal ring 13 and is in contact with the inner periphery of the bearing 2 via the metal ring 13.

A locking lip 4 inclined outward is formed on the outer end of the main body 10 a of the dust seal 10, that is, on the same side as the dust lip 11, and the outer peripheral end of the locking lip 4 is inside the bearing 2. It is engaged with the peripheral surface.

The main body 10a of the dust seal 10 is made of rubber, for example, and the locking lip 4 is integrally made of the same material as the main body 10a.

FIG. 2 shows another embodiment of the dust seal of the present invention, in which the locking lip 5 is made of metal and formed into a ring shape, and the inner peripheral portion of the proximal end of the locking lip 5 is spot-welded to the metal ring 13. In addition, the outer peripheral portion of the base end is mold-bonded with the main body 10a of the dust seal 10.

FIG. 3 shows another embodiment, in which the locking lip 6 is made of metal or rubber, and a plurality of projecting pieces 6a are formed on the outer periphery of the annular base end portion of the locking lip 6 and the base end portion of the dust seal 10 is formed. The main body 10a is molded and bonded.

FIG. 4 shows another embodiment, in which the locking pieces 13a and the locking lips 7 are alternately formed on the outer circumference of the metal ring 13, and the locking pieces 13a are bent downward and mold-bonded. The stop lip 7 is bent outward and inclined, and is joined to the outer circumference of the bearing 2. The operation and effect of FIGS. 1, 2 and 3 are the same as those of the embodiment of FIG.

[0018]

[Effect of the device]

 The present invention has the following effects. A locking lip inclined outward is provided at the outer end of the dust seal, and the locking lip engages with the inner circumference of the housing. The stop lip is stretched to create resistance and prevent it from coming off. Since the stopper for holding the dust seal in the housing and the groove processing to fix this stopper are not required, the number of parts is small, the workability is improved, and the assemblability is also improved.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a dust seal according to another embodiment.

FIG. 3 is a cross-sectional view of a dust seal according to another embodiment.

FIG. 4 is a sectional view of a dust seal according to another embodiment.

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

[Explanation of symbols]

 1 Cylinder 2 Housing barrel bearing 3 Rod barrel piston rod 4, 5, 6, 7 Locking lip 10 Dust seal 10a Main body

Claims (1)

Claims for utility model registration: 1. A shaft sealing device in which a rod is slidably inserted into a housing, and a dust lip of a dust seal provided on the inner circumference of the housing is slidably contacted with the outer circumference of the rod. A shaft sealing device, wherein a locking lip inclined outward is provided at an outer end of the dust seal, and the locking lip is engaged with an inner circumference of the housing.