Sealing means

Abstract

Provided is a sealing device configured so as to prevent deterioration in the lubricating properties of a seal lip caused by the squeeze-out of a lubricant, thereby improving the durability of the sealing device. This sealing device is provided with: an oil-facing seal lip (13) extending toward a sealed space (A); and a dust seal lip (14) extending from the root (13a) of the oil-facing seal lip (13) toward a space (B) on the side opposite the sealed space and brought into close contact, in a slidable manner, with the outer peripheral surface of a rotating shaft (3). A lubricant is applied to an inner peripheral surface between the oil-facing seal lip (13) and the dust seal lip (14). The oil-facing seal lip (13) has formed thereon: a primary lip (131) brought into close contact, in a slidable manner, with the outer peripheral surface of the rotating shaft (3); and a secondary lip (132) located closer to the root (13a) of the oil-facing seal lip than the primary lip (131) and brought into close contact, in a slidable manner, with the outer peripheral surface of the rotating shaft (3). The secondary lip (132) is divided at a plurality of circumferential locations by slits (133) axially extending through the secondary lip (132).

Description

technical field [0001] The present invention relates to a sealing device for sealing the periphery of a shaft through a sealing lip, for example, for automobile power steering and the like. Background technique [0002] As a sealing device that uses a sealing lip to seal the annular gap between the casing of the hydraulic control valve in, for example, the power steering of an automobile and the shaft freely inserted through the casing, such as Figure 5 and Figure 6 Sealing device shown in . [0003] That is, this sealing device 100 has the following structure: the fixed sealing part 102, the oil-proof sealing lip 103 and the dust-proof sealing lip 104 are integrally molded on the reinforcing ring 101 through a rubbery elastic body, and the fixed sealing part 102 is tightly fitted to such as Figure 6 On the inner peripheral surface of the housing 200 shown, the oil-proof sealing lip 103 is slidably attached to the outer peripheral surface of the shaft 300, and the shaft ...

AI Technical Summary

Problems solved by technology

[0008] However, according to the existing sealing device 100, the deformation of the oil-proof sealing lip 103 caused by the swinging of the shaft 300 causes the grease between the main lip 103a and the auxiliary lip 103b of the oil-proof sealing lip 103 and the shaft 300 to be squeezed. If the pressure is discharged (extrusion), it may cause abnormal noise due to lack of lubrication, and there is also a possibility of insufficient lubrication due to damage to the grease retention function due to abrasion of the blasted surface 103c.

Images