JPH0131810Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an oil seal, and in particular, to an oil seal formed by adhesively fixing the outer periphery of a metal ring and a resin base material with a rubber elastic body.

[Prior art]

As shown in FIGS. 5 and 6, a conventional oil seal of this type has an inner horizontal portion 25 of a metal ring 21 having an approximately L-shaped cross section, and an outer horizontal portion of a resin base material 22 having an approximately L-shaped cross section. 26 are overlapped, and the outer periphery of the metal ring 21 and the resin base material 22 is covered with a rubber elastic body 23.
It is constructed by adhesive molding.

[Problem that the invention attempts to solve]

However, in the conventional device as described above, the outer horizontal portion 26 of the resin base material 22 is formed in a sheet shape that covers the entire overlapped portion with the inner horizontal portion 25 of the metal ring 21. , rubber elastic body 2
3, the rubber elastic body 23 and the resin base material 22 and the rubber elastic body 23 and the metal ring 21 are bonded, respectively, but the outer horizontal portion 26 of the resin base material 22 and the inside of the metal ring 21 are bonded. It is not bonded to the horizontal portion 25, and therefore, when the shaft member is installed or reciprocated, a gap is created between the bent waist portion 30 of the resin base material 22 and the inner end portion 29 of the metal ring 21, making the seal lip portion 31 unstable. As a result, there is a problem in that the ability of the seal lip portion 31 to follow the movement of the shaft member is insufficient, and oil leakage may occur.

This invention solves the problems of the conventional products as described above, increases the adhesion strength between the bent waist of the resin base material and the inner end of the metal ring, and reliably prevents oil leakage. The purpose is to provide oil seals.

[Means for solving problems]

This idea aims to achieve the above objectives.
The outer horizontal part of the resin base material having an approximately J-shaped cross section is superimposed on the inner horizontal part of the metal ring having an approximately L-shaped cross section, and the outer periphery of the metal ring and the resin base material is bonded with a rubber elastic material. In the molded oil seal, the outer horizontal portion of the resin base material and the inner horizontal portion of the metal ring can be bonded to the outer horizontal portion of the resin base material during adhesion molding with the rubber elastic body. It has a configuration in which a through portion is formed.

[Effect]

By adopting the above-mentioned means, this invention increases the adhesion strength between the bending waist part of the resin base material and the inner end of the metal ring, so that the resin base material remains stable even when the shaft member is attached or reciprocated. No gap is created between the bent waist portion and the inner end of the metal ring, and the seal lip portion accurately follows the movement of the shaft member.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

An embodiment of the oil seal according to this invention is shown in FIG. 1 and FIGS. 2a and 2b, and this oil seal includes a metal ring 1 having a substantially L-shaped cross section,
It is composed of a resin base material 2 having a substantially J-shaped cross section and a rubber elastic body 3.

The metal ring 1 has an outer rising portion 4 and an inner horizontal portion 5.
Further, the resin base material 2 includes an outer horizontal part 6 and an inner rising part 7, and the outer horizontal part 6 has a plurality of resin parts disposed along the circumferential direction as shown in FIGS. 2a and 2b. A large number of holes 8, 8, . . . are formed penetrating both the front and back surfaces.

The rubber elastic body 3 connects the inner horizontal part 5 of the metal ring 1 and the outer horizontal part 6 of the resin base material 2 to the inner end 9 of the metal ring 1 and the bent waist part 1 of the resin base material 2.
0 so that they correspond to each other, and then overlap them, and in this state, the metal ring 1 and the resin base material 2
The seal lip part 11 is formed at the same height as the tip of the inner rising part 7 of the resin base material 2, and the seal lip part 11 is formed below the inner end part 9 of the metal ring 1. It is equipped with a dust strip 12.

Note that 13 is a garter spring fitted into the groove of the seal lip portion 11.

Next, the operation of the above will be explained.

As described above, the inner horizontal part 5 of the metal ring 1 and the outer horizontal part 6 of the resin base material 2 are arranged so that the inner end 9 of the metal ring 1 and the bent waist part 10 of the resin base material 2 correspond to each other. After positioning and overlapping them, in this state, the outer peripheries of the metal ring 1 and the resin base material 2 are adhesively molded with the rubber elastic body 3, so that the outer surface of the inner rising part 7 of the resin base material 2 and the outer horizontal part 6 are formed. The upper surface, the inner and outer surfaces of the outer rising portion 4 of the metal ring 1, and the lower surface of the inner horizontal portion 5 are all bonded to the rubber elastic body 3, and the inner horizontal portion 5 of the metal ring 1 is bonded to the rubber elastic body 3 through the holes 8, 8, . Since the upper surface is also bonded to the rubber elastic body 3, the outer horizontal portion 6 of the resin base material 2 and the inner horizontal portion 5 of the metal ring 1 are not only overlapped, but also have holes 8, 8,... ... are bonded to each other via the rubber elastic body 3 inside, so that the bent waist portion 10 of the resin base material 2 and the inner end portion 9 of the metal ring 1
This increases the adhesion strength with the material.

As a result, there is no gap between the bent waist portion 10 of the resin base material 2 and the inner end 9 of the metal ring 1 even when the shaft member is attached or reciprocated, and the seal lip portion 11 is stably attached to the shaft. The movement of the member is accurately followed, and as a result, oil leakage is prevented from occurring.

Furthermore, gas generated from the rubber elastic body 3 during molding can easily escape through the inner circumferential groove 14, thereby preventing molding defects in which air remains in the inner circumferential groove 14.

3 and 4a and 4b show other embodiments of the oil seal according to this invention, and this oil seal has an outer horizontal portion 6 of the resin base material 2.
As shown in FIGS. 4a and 4b, a large number of notches 15, 15, . and the point formed by the rubber elastic body 3.
The seal lip portion 11 is formed above the tip of the inner rising portion 7 of the resin base material 2, and the rubber elastic body 3 is formed to extend significantly below the inner end portion 9 of the metal ring 1. Except for this point, the structure is otherwise the same as that of the first embodiment shown in FIG. 1 and FIG.
Components similar to those of the oil seals in FIGS. 1 and 2a and 2b are given the same reference numerals.

Regarding the operation of this embodiment, first, the inner horizontal part 5 of the metal ring 1 and the outer horizontal part 6 of the resin base material 2 are connected to the inner end 9 of the metal ring 1 and the resin base material 2. When the metal ring 1 and the outer circumference of the resin base material 2 are bonded and molded with the rubber elastic body 3 in this state, the inner rising portion of the resin base material 2 is formed. 7 and the upper surface of the outer horizontal portion 6, both the inner and outer surfaces of the outer rising portion 4 of the metal ring 1, and the lower surface of the inner horizontal portion 5 are bonded to the rubber elastic body 3,
Moreover, the metal ring 1 is passed through the notches 15, 15,...
Since the upper surface of the inner horizontal part 5 of the rubber elastic body 3 is also bonded, the outer horizontal part 6 of the resin base material 2 and the metal ring 1
The inner horizontal portion 5 of the resin base material 2 is not simply overlapped, but is also bonded to each other via the rubber elastic body 3 in the notches 15, 15, . The adhesion strength between the waist portion 10 and the inner end portion 9 of the metal ring 1 increases.

As a result, there is no gap between the bent waist portion 10 of the resin base material 2 and the inner end 9 of the metal ring 1 even when the shaft member is attached or reciprocated, and the seal lip portion 11 is stably attached to the shaft. The movement of the member is accurately followed, and as a result, oil leakage is prevented from occurring.

Further, gas generated from the rubber elastic body 3 during molding can easily escape in the inner circumferential groove 14, thereby preventing molding defects that would occur if air remained in the inner circumferential groove 14.

[Effect of idea]

By configuring this idea as described above,
During adhesive molding with a rubber elastic body, the outer horizontal part of the resin base material and the inner horizontal part of the metal ring can be bonded to each other via the rubber elastic body, so that the bent waist part of the resin base material and the inside of the metal ring can be bonded together through the rubber elastic body. It is possible to increase the adhesion strength with the end, and prevent a gap from forming between the bent waist of the resin base material and the inner end of the metal ring even when the shaft member is attached or reciprocated. As a result, the seal lip is stable and accurately follows the rotation, reciprocation, rocking, and all other movements of the shaft member, which has excellent effects such as preventing oil leaks. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main parts showing an embodiment of the oil seal according to this invention, Fig. 2 a and b are a plan view and longitudinal sectional view showing the resin base material of the oil seal of Fig. 1, and Fig. 3 4A and 4B are a plan view and a longitudinal sectional view showing the resin base material of the oil seal of FIG. 3, and FIGS. 1A and 1B are vertical cross-sectional views of main parts showing different embodiments of a conventional oil seal. 1, 21... Metal ring, 2, 22... Resin base material, 3, 23... Rubber elastic body, 4... Outer rising part, 5, 25... Inner horizontal part, 6, 26... Outer horizontal part Part, 7... Inner rising part, 8... Hole, 9, 2
9... Inner end, 10, 30... Bent waist, 1
1, 31...Seal lip portion, 12...Dust lip, 13...Garter spring, 14...Inner peripheral groove, 15...Notch.

Claims (1)

[Claims for Utility Model Registration] (1) In the inner horizontal part of a metal ring having an approximately L-shaped cross section,
In an oil seal formed by overlapping the outer horizontal parts of resin base materials having a substantially J-shaped cross section and adhesively molding the outer periphery of the metal ring and the resin base material with a rubber elastic material, the resin base material At the time of adhesive molding with the rubber elastic body on the outer horizontal part,
An oil seal characterized in that a through portion is formed to enable bonding between an outer horizontal portion of the resin base material and an inner horizontal portion of the metal ring. (2) The oil seal according to claim 1, wherein the penetrating portion includes a large number of holes arranged along the circumferential direction of the outer horizontal portion of the resin base material. (3) A utility model registration claim in which the penetration portions are arranged in large number along the circumferential direction of the outer horizontal portion of the resin base material, and each of the penetration portions is a notch that opens at the outer peripheral end of the outer horizontal portion. The oil seal described in the range 1 above.