JPS5969571A - Fluid-seal structure - Google Patents

Abstract

PURPOSE:To prevent a seal member from slipping off from a rotary shaft which is inserted through a through-hole formed in a sidewall member defining a fluid chamber and the outer peripheral wall of which is fitted with a seal member thereonto, by providing a radial projection to the seal member. CONSTITUTION:A sidewall member 2 defining a fluid chamber 1 is formed therein with a through-hole 3 communicating between the fluid chamber 1 and the outside. A rotry shaft 4 is inserted through the through-hole 3 with an annular seal member 5 being disposed therebetween. Further, the annular seal member 5 is composed of an outer peripheral section 5a and an inner peripheral section 5b fitted, onto the outer periphery of its end part 5ba, with an O-ring 7, and provided, at its outer opening end, with a lip part 5bb. As mentioned above, the end part of the outer peripheral section 5a, on the side of the fluid chamber 1, is formed with a radial projection 5aa. Thereby, the holding force of the projection 5aa surely prevents the seal member 5 from slipping off from the through- hole 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid seal structure that forms a fluid seal between the outer circumferential surface of a rotating shaft that passes through a 1Φ shaft through a through hole provided in a side wall member forming a fluid chamber and the through hole. .

The sealing structure includes a sealing member that is mounted and held in the through-hole, and a suitable holding structure is employed to hold the sealing member in the through-hole. As the holding structure, for example, the side wall member forming the through hole is divided into two, a seal member is inserted into the through hole, and the side wall member is tightened with an appropriate fastening means to sandwich the seal member. There is something to be done in a way that absorbs. Also,
There is also a device that holds the seal member lυ by press-fitting the seal member into the through hole by taking advantage of the elasticity of the seal member. In such a conventional seal member holding structure, when the pressure difference between the outside and the outside of the fluid chamber becomes large, there is a high possibility that the seal member may fall out of the through hole. In particular, there was a great fear of this in the latter holding structure.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fluid seal structure that can firmly hold a seal member without the problems described above in the conventional example.

In the seal structure according to the present invention, a protrusion protruding in the radial direction is provided on the periphery or outer periphery of the annular seal member to be inserted into the through hole on the fluid chamber side, so as to prevent the seal part H from falling off. structure etc. (,7).

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a seal structure according to a first embodiment of the present invention. In this seal structure, a through hole 3 is formed in a side wall member 2 forming a fluid chamber 1 to communicate the fluid chamber 1 with the outside. ing. A rotary shaft 4 that is supported by a bearing (not shown) is inserted into the through hole 3 . An annular sealing member 5 is press-fitted into the through-hole 3 in the direction of arrow A f)s + to form a fluid seal between the rotary shaft 4 and the through-hole. The sealing member 5 is composed of an outer circumferential wall portion 5a and an inner circumferential wall portion 51) forming a substantially U-shaped cross section, and is fitted into the annular reinforcing member 5 having a substantially U-shaped cross section. End portion 51)a of the inner circumferential wall portion 5b of the annular seal member 5
The rotary shaft 4 is closely inserted into the center hole formed by J while maintaining a fluid seal. In order to further ensure the fluid seal between the rotating shirt 1 to 4 and the end 5ha, an O-ring 7 is fitted on the outer periphery of the end 51)a to press the end 5ha to the rotating shirt 1 to 4. There is. Also,
A tongue portion 5bb is provided at the outer open end of the inner circumferential wall to further ensure a fluid seal between the rotary shaft 4 and the sealing member. Although the above configuration is similar to that of the conventional example, the seal member 5 according to the present invention further has a protrusion 5aa projecting in the radial direction at the fluid chamber side end of the outer peripheral wall portion 5a. The protrusion 5a may be continuous over the entire outer periphery of the sealing member 5, or may be provided partially on the outer periphery of the sealing member 5.

Due to the provision of such a protrusion 5, the sealing member 5 according to the present invention, after being press-fitted into the through-hole 3, will remain stable due to the holding force of the protrusion 5aa even if the internal and external pressure difference becomes considerably large. The puller will not fall out of the through hole 3 and will fit securely into the through hole 3.
It is maintained in

FIG. 2 shows another embodiment of the present invention, in which the protrusion 5aa is provided with a recess 8 extending in the circumferential direction. The projection 5aa is bent when the seal member 5 is inserted, thereby facilitating the insertion of the seal member 5 into the through hole 3. The other configurations described above are similar to the embodiment shown in FIG.

FIG. 3 shows still another embodiment of the present invention, in which the sealing member 5 and the annular reinforcing member 6 are
One or more split grooves 9 are provided at the end on the fluid chamber side. The other configurations described above are similar to the embodiment shown in FIG. In the seal structure 43 having such a configuration, when the seal member 50 is inserted into the through hole 3, the end of the seal member 5 on the fluid chamber side becomes appropriately narrowed due to the split groove 9, making it easier to insert the seal member 5. It is. Further, after insertion, the elastic action of the reinforcing member works effectively to firmly secure the sealing member 5 to the through hole 3.
It is held within.

FIG. 4 shows still another embodiment of the present invention, in which a groove 10 extending in the circumferential direction is provided on the inner wall surface of the through hole 3. As shown in FIG. Further, when the seal member 5 is inserted into the through hole 3, a protrusion 11 is provided on a portion of the circumferential surface of the seal member 5 that is opposite to the outer circumferential surface of the seal member 5. A groove 12 is provided on the outside of the protrusion 11, so that the protrusion 11 is bent when the reseal member 5 is inserted into the through hole 3, so that the seal member 5 can be easily inserted. The other configurations described above are similar to the embodiment shown in FIG. When the sealing member 5 configured as described above is inserted into the through hole, the protrusion 1
1 engages with a groove 10 provided on the inner wall of the through hole 3, and the seal member 5 is firmly held.

FIG. 6 shows still another embodiment of the present invention, in which an annular locking member 13 is provided at the end of the through hole 3 on the fluid chamber side. The annular locking member 13 has a hook portion 13a provided toward the outside. On the other hand, a hook-shaped cross section that can be engaged with the hook portion 13a of the locking member 13 is formed at the fluid chamber side end of the seal member 5. Other than the above, the structure is similar to that of the embodiment shown in FIG. In the seal structure having such a configuration, when the seal member 5 is inserted into the through hole 3, the hook 6- portion of the locking member 13 and the seal member 5 engages in phase η, and the seal member 5 is firmly inserted into the through hole 3. It is retained. The locking portion 13- may be formed into an annular shape having a notch as shown in FIG. 6, or may be a complete annular body as shown in FIG.

As is clear from the above, according to the seal structure according to the present invention, even if the pressure difference between the inside and outside of the fluid chamber becomes severe, the seal member is firmly held and will not fall. In addition, the structure is simple and there is no significant difference in cost compared to the conventional example, and furthermore, the sealing member can be easily attached to the through hole.

[Brief explanation of the drawing]

FIG. 1 to FIG. 5 are cross-sectional views showing embodiments of the present invention;
FIGS. 6 and 7 are plan views of some parts H of the embodiment shown in FIG. ...Side wall member 3...Through hole 4...Rotating shaft 5...Seal member 5aa, 11...Protrusion 6...Annular reinforcement Member 7... O-ring 13... Locking member Applicant: Honda Motor Co., Ltd. Agent, Patent Attorney: Motohiko Fujimura Proceedings: Masanaka Hoho I (Volunteer) December 19, 1982, Incident Indication of 1980 Patent Application No. 180629 2 Name of the invention Fluid seal structure 3 Relationship with the case of the person making the amendment Patent applicant Address 6-27-8 Jingumae, Shibuya-ku, Tokyo Name
Name (532) Kida Giken Kogyo Co., Ltd. 4, Agent 104 Address: 3-10-9-6, Ginza, Chuo-ku, Tokyo, ``Detailed description of the invention'' and ``Brief description of the drawings'' of the specification to be amended ” Contents of correction in each column 7 (1) In the 5th line of page 4 of the specification box, “O-ring 7” is corrected to “coil spring 7”. (2) Similarly, on page 8, line 4 of the specification, "0 ring" is corrected to "coil spring." 2-

Claims (2)

[Claims] (1) An annular fluid that is press-fitted into the through hole to form a fluid seal between the outer peripheral surface of the rotating shaft inserted into the through hole installed in the side wall member forming the fluid chamber and the through hole. A seal structure comprising a sealing member, wherein the sealing member has a protrusion protruding in a radial direction at a peripheral edge or outer circumference on the fluid chamber side, and the protrusion engages with the side wall member. . (2) The protrusion is formed by a locking member provided at the fluid chamber side end of the through hole and engaged with the sealing member. Seal structure as described.