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JP-2026074592-A - sealing device

JP2026074592AJP 2026074592 AJP2026074592 AJP 2026074592AJP-2026074592-A

Abstract

[Problem] To provide a sealing device that uses a U-shaped slinger and can achieve both torque reduction and improved sealing performance. [Solution] The core material portion 30A of the sealing device 10 is equipped with a seal lip portion 35 made of an elastic material that rotates relative to the slinger 20A while in contact with it. The slinger 20A is equipped with a first cylindrical portion 22, a disc portion 21, and a second cylindrical portion 23, and has a recessed space 24 with the first cylindrical portion 22, the disc portion 21, and the second cylindrical portion 23 forming the outer frame. At least two continuous surfaces facing the recessed space 24, namely a first surface 25a corresponding to the disc portion and a second surface 25b adjacent to the first surface 25a, are roughened. [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 (7)

  1. 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, configured to seal the space between the two members, The core material portion includes a seal lip portion made of an elastic material that rotates relative to the slinger while in contact with it. The slinger comprises a first cylindrical portion for fitting, a disc portion, and a second cylindrical portion, and has a recessed space with the first cylindrical portion, the disc portion, and the second cylindrical portion forming an outer frame. A sealing device characterized in that at least two continuous surfaces, a first surface corresponding to the disc portion facing the recessed space and a second surface adjacent to the first surface, are roughened.
  2. In claim 1, A sealing device characterized in that substantially the entire surface of the two continuous surfaces is continuously roughened, including the inner corners of both surfaces.
  3. In claim 1, The second surface is the surface corresponding to the first cylindrical portion. The seal lip portion comprises a first lip piece corresponding to the first surface and a second lip piece corresponding to the second surface. A sealing device characterized in that, during the relative rotational movement, at least one of the first lip piece and the second lip piece elastically contacts the target surface.
  4. In claim 1, A sealing device characterized in that the arithmetic mean roughness of the first surface and the second surface, respectively, is 0.4 or more and 0.9 or less.
  5. In claim 1, The first surface consists of three regions: an inner portion, a central portion, and an outer portion, which are virtually divided along the radial direction into approximately equal radial lengths. A sealing device characterized in that the ratio of the arithmetic mean roughness of the outer portion to the arithmetic mean roughness of the central portion is greater than the ratio of the arithmetic mean roughness of the inner portion to the arithmetic mean roughness of the central portion, and the difference is 0.25 or less.
  6. In claim 1, The first surface consists of three regions: an inner portion, a central portion, and an outer portion, which are virtually divided along the radial direction into approximately equal radial lengths. A sealing device characterized in that the ratio of the arithmetic mean roughness of the second surface to the arithmetic mean roughness of the central portion is greater than the ratio of the arithmetic mean roughness of the inner portion to the arithmetic mean roughness of the central portion.
  7. In claim 1, A sealing device characterized in that the inner corner between the first surface and the third surface corresponding to the second cylindrical portion is roughened.

Description

This invention relates to a sealing device having a seal lip portion made of an elastic material that rotates relative to a slinger while in contact with it. Conventionally, in systems where the lip portion of the seal lip elastically (sliding) against an L-shaped slinger, various techniques have been proposed to roughen the inner surface of the L-shaped slinger that may come into contact with the lip portion, in order to reduce torque (see, for example, Patent Document 1). Japanese Patent Publication No. 2010-78140 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 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, both ends of the sealed space 6 along the axial direction are 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) (see Figure 2) is positioned on the vehicle body-side surface of the slinger 20A of the sealing device 10, which is mounted on the vehicle body. A magnetic sensor 15 is installed on the vehicle body opposite the annular magnet 27. 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), which will be described later. It has numerous alternating north and south poles magnetized along its circumferential direction. The magnetic sensor 15 detects the magnetic change accompanying the rotation of t