JP-2026074593-A - Method for manufacturing a sealing device

Abstract

[Problem] To provide a method for manufacturing a sealing device that can roughen the inner surface of the slinger, which is in sliding contact with the lip piece, over a wide area, and can ensure uniform roughening of the slinger. [Solution] The slinger 20A comprises a first cylindrical portion 22 and a disc portion 21 which are responsible for fitting into one of the two members, and has a recessed space 24 opposite to the core material portion 30A, with the first cylindrical portion 22 and the disc portion 21 forming the outer frame. In the surface treatment step, the projection material 41 is projected onto the surface of the slinger 20A on the recessed space 24 side at different projection angles. [Selection Diagram] Figure 1

Inventors

• 大松 佑汰

Assignees

• 内山工業株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (4)

1. A method for manufacturing an annular sealing device comprising a core portion fitted and fixed to one of two members that rotate concentrically relative to each other, and a slinger fitted and fixed to the other member, The manufacturing method includes at least a surface treatment step involving the impact of a projectile onto the slinger, The sealing device is configured such that the core material portion comprises a seal lip portion made of an elastic material that rotates relative to the slinger, either in contact with or without contact with the slinger, and the slinger comprises a first cylindrical portion and a disc portion that are responsible for fitting into either of the two members, and the first cylindrical portion and the disc portion form an outer frame, with a recessed space opposite to the core material portion. A method for manufacturing a sealing device, characterized in that, in the surface treatment step, the projection material is projected onto the surface of the slinger on the recessed space side at different projection angles.
2. In claim 1, The surface treatment step includes: A first projection step involves projecting the projection material from a position on the recessed space side of the second surface toward the inner corner and vicinity of the first surface, which is adjacent to the first surface and is adjacent to the first surface and is corresponding to the first cylindrical portion of the slinger, at an angle of 10 degrees or more and 40 degrees or less with respect to the radial direction of the first surface, from the position of the second surface facing the recessed space. The method includes a second projection step of projecting the projection material toward the first surface at an angle of 80 degrees or more and 100 degrees or less with respect to the radial direction of the first surface, A method for manufacturing a sealing device, characterized in that one of the first and second projection steps is performed first, and the other step is performed thereafter.
3. In claim 1, The slinger further comprises a second cylindrical portion, and the second cylindrical portion, the disc portion, and the first cylindrical portion form a U-shape in cross-section. A method for manufacturing a sealing device, characterized in that the protrusion dimension of the second cylindrical portion from the disc portion is smaller than the protrusion dimension of the first cylindrical portion from the disc portion.
4. In claim 1, The surface treatment step includes a plurality of projection steps in which the projection material is projected onto the surface of the slinger on the recessed space side at different projection angles. A method for manufacturing a sealing device, characterized by performing these multiple types of projection steps sequentially or simultaneously.

Description

This invention relates to a method for manufacturing a sealing device having a core material and a slinger. Conventionally, in sealing devices where the lip portion of the seal lip attached to the core material elastically contacts (slids against) the L-shaped inner surface of the slinger, various techniques have been proposed to roughen the L-shaped inner surface (formed by the disc portion and cylindrical portion) that the lip portion may elastically contact, in order to reduce torque (see, for example, Patent Documents 1 and 2). Patent Documents 1 and 2 describe a surface treatment method involving impact of a projectile onto the target surface. Japanese Patent Publication No. 2010-78140Japanese Patent Application Publication No. 6-55449 This is a schematic longitudinal cross-sectional view of a bearing device including a sealing device according to an embodiment of the present invention.Figure 1 is an enlarged view of section X, where (a) and (b) are schematic cross-sectional end views of sealing devices relating to two different usage modes in which slingers of the same shape are used.(a) and (b) are schematic partial longitudinal cross-sectional views showing two aspects of the projection step of the projection material onto the slinger body.The figures and tables show the test results of one embodiment of the sealing device of the present invention, where (a) is a schematic cross-section end view of the slinger body, and (b), (c), and (d) are tables showing the test results.(a) to (c) are schematic cross-sectional end views of a slinger body used in a sealing device according to another embodiment of the present invention.(a) and (b) are schematic end views of a slinger body used in a sealing device according to another embodiment of the present invention. The manufacturing method of a sealing device according to an embodiment of the present invention will be described below with reference to Figures 1 to 6 of the attached drawings. First, the basic configuration of the bearing device 1 to which the sealing devices 10 and 11 are mounted will be described based on Figure 1. In this specification, as shown in Figure 1, the side facing the wheel (not shown) along the rotation axis L direction (hereinafter abbreviated as the axial direction) (the side facing left in Figure 1) is referred to as the wheel side, and the side facing the vehicle body (not shown) (the side facing right in Figure 1) is referred to as the vehicle body side. In the bearing device 1 shown in Figure 1, an outer ring member 2 is fixed to the vehicle body (not shown), with two rows of rolling elements 7 arranged inside it. Further inside these, a hub ring 3b and an inner ring 3a are supported so as to be rotatable around the axis. The hub ring 3b has a hub flange 3c, and a drive wheel (not shown) is attached to the hub flange 3c by bolts 3d and nuts (not shown). Furthermore, the drive shaft 4 is coaxially spline-fitted to the hub wheel 3b, and the drive shaft 4 is connected to a drive source (not shown) via a constant velocity joint 5. The drive shaft 4 is integrated with the hub wheel 3b by a nut 4a, preventing the hub wheel 3b from detaching from the drive shaft 4. The inner ring member 3 is composed of a hub ring 3b and an inner ring 3a. This inner ring member 3 is capable of relative rotation to the outer ring member 2 around the rotation axis L. Rolling elements 7 are interposed between the inner ring member 3 and the outer ring member 2, held in place by a retainer 7a. Thus, the outer ring member 2 and the inner ring member 3 form two members that rotate relative to each other, and an annular space is formed between these two members, which includes the interposed portion of the rolling element 7. This annular space is the bearing space and is designated as the sealed space 6. A sealing device 10 is installed at the vehicle body-side end of the sealed space 6 in the axial direction. Another sealing device 11 is installed at the wheel-side end of the sealed space 6. By installing sealing devices 10 and 11 at both ends in this way, the sealed space 6 is sealed. The sealed space 6 is filled with a lubricant such as grease (not shown), which ensures smooth rolling of the rolling elements 7. The sealing devices 10 and 11 prevent the lubricant from leaking out, prevent the intrusion of muddy water and dust into the sealed space 6 from the outside, and have the function of discharging any muddy water that has entered. Furthermore, an annular magnetic encoder (annular magnet 27) is positioned on the vehicle-side surface of the slinger 20A of the sealing device 10, which is attached to the vehicle body. A magnetic sensor 15 is installed on the vehicle body opposite the annular magnet 27 (see Figure 2). Note that the slinger 20A does not necessarily have to have the annular magnet 27. The annular magnet 27 is an elastic member made by kneading magnetic powder into rubber material, integrally molded with the slinger 20A (slinger body 20),