CN-224229239-U - Oil seal

Abstract

An oil seal is provided to improve the retention of a lubricant. The oil seal (1) has a side lip (14) extending in the axial direction and contacting a surface of the rotating body (rotating shaft (2)) in the radial direction, and a plurality of concave portions (16) are provided in the surface of the side lip (14) contacting the rotating body (2) in a state separated from each other in the circumferential direction and the radial direction. Since the plurality of recesses (16) are discontinuous, the lubricant is blocked at the opening edge of each recess (16), and it is difficult for the lubricant to flow out of each recess (16).

Inventors

• TOYAMA RYOTA

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20250513

Priority Date

20240517

Claims (1)

1. 1. An oil seal having a side lip extending in an axial direction and contacting a surface in a radial direction in a rotating body, characterized in that, The side lip has a surface in contact with the rotating body, and a plurality of recesses are provided in the surface separated from each other in the circumferential direction and the radial direction.

Description

Oil seal Technical Field The present utility model relates to oil seals. Background For example, patent document 1 describes a configuration in which a parallel groove is formed in a side surface of a side lip of a sealing device. Prior art literature Patent literature Patent document 1 Japanese patent No. 4280903 (Japanese patent laid-open No. 2004-263797) Disclosure of utility model Problems to be solved by the utility model In patent document 1, since the parallel groove is continuous in the circumferential direction of the side lip, there is a possibility that a lubricant such as grease applied in the parallel groove is pulled in the circumferential direction along with rotation of the shaft, and flows out of the parallel groove. In view of such circumstances, an object of the present utility model is to provide an oil seal having improved retention of lubricant. Means for solving the problems The oil seal of the present utility model has a side lip extending in an axial direction and contacting a surface of a rotating body in a radial direction, and is characterized in that a plurality of concave portions are provided in a state of being separated from each other in a circumferential direction and a radial direction on a surface of the side lip contacting the rotating body. According to this configuration, the lubricant filled in the plurality of recesses is applied to the inner peripheral surface of the side lip, and is pulled along with the rotation of the rotating body, but since the plurality of recesses are separated from each other, the lubricant is blocked at the opening edge of each recess, and it is difficult for the lubricant to flow out of each of the plurality of recesses. Accordingly, since the holding property of the lubricant in each of the plurality of concave portions is improved, the frictional resistance of the surface (also referred to as a sliding surface) of the side lip that slides against the rotating body is reduced, and the wear resistance of the sliding surface is improved. ADVANTAGEOUS EFFECTS OF INVENTION According to the present utility model, an oil seal having improved retention of lubricant can be provided. Drawings Fig. 1 is a sectional view showing an upper side of one embodiment of an oil seal of the present utility model. Fig. 2 is a front view showing an inner peripheral surface of the side lip. Fig. 3 is an enlarged view of a contact portion between the side lip and the rising wall surface of the rotary shaft. Detailed Description Hereinafter, preferred embodiments for carrying out the present utility model will be described in detail with reference to the accompanying drawings. Fig. 1 to 3 show one embodiment of the present utility model. The oil seal 1 illustrated in the drawings is attached in a non-rotating state to a stationary ring body (not shown) disposed in a non-contact manner on the outer periphery of the rotary shaft 2, and is configured such that a main lip 12, a sub lip 13, and a side lip 14 are integrally provided on a main body 11. A large diameter portion 21 extending radially outward is provided at a predetermined position in the axial direction of the rotary shaft 2. The body 11 has a shape in which an annular plate portion 11b that is radially inward is integrally connected from one end side in the axial direction of the cylindrical portion 11 a. Although not shown in detail, the main body 11 is formed by vulcanizing and bonding a rubber-like elastic material to a metal core. The main lip 12, the sub lip 13, and the side lips 14 are formed of a rubber-like elastic material. The main lip 12 is provided so as to extend obliquely inward from the inner diameter side of the annular plate portion 11b of the main body 11, and suppresses or prevents a lubricant (grease or oil, not shown) present in a space sealed by the oil seal 1 (referred to as a sealed space) from flowing out to the side of the sub lip 13 and the side lip 14, and further to the outer space. The main lip 12 has a triangular cross-sectional shape that is sharp toward the inner diameter side, and a spring ring 15 for pressing the distal end portion against the outer peripheral surface of the rotary shaft 2 is attached to the outer peripheral surface thereof. The side lips 14 and the sub-lips 13 are formed so as to incline outward from the inner diameter side of the main body 11, and prevent or reduce the intrusion of foreign matter such as moisture and dust into the main lip 12 side and the sealed space. The main lip 12 and the sub lip 13 are brought into contact with the outer peripheral surface of the rotary shaft 2 in a state where a predetermined pressure is applied, and thus are in a deflected state. The side lip 14 comes into contact with a rising wall surface rising radially outward at the large diameter portion 21 of the rotary shaft 2 in a state where a predetermined pressure is applied, and thus comes into a deflected state. As shown in fig. 2, a plurality of concave portions