JPH0547502U - Liquid container - Google Patents

Abstract

(57) [Summary] [Structure] An annular seal 28 is attached to the filler port 20 of the liquid container body.
The cap 22 is attached via. Its annular seal 2
8 is formed with an annular projection 35 that abuts at least one surface to be sealed. The protrusion 35 meanders in the circumferential direction. [Effect] The contact pressure between the annular seal and the surface to be sealed can be increased to improve the sealing performance, and the sealing performance is deteriorated even if the surface to be sealed has uneven surface roughness or distortion. Can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid container having a seal structure adopted at an opening closed by a cap.

[0002]

[Prior Art]

 For example, in an oil tank for a hydraulic power steering device, when the oil injection opening is closed by a cap, the inner surface of the cap and the upper surface of the outer periphery of the opening are the sealed surfaces, and both the sealed surfaces are sealed. Sealing is performed by interposing an annular seal between them. However, in such a seal structure, since the annular seal and the surface to be sealed are in surface contact with each other, the contact pressure is small and a sufficient sealing function cannot be achieved, so that the inside of the tank can be prevented. There was a risk that oil would leak from the corrugated seal due to vehicle vibration and the like. In particular, when the oil tank is made of synthetic resin, the contact pressure between the surface to be sealed and the annular seal becomes small due to molding distortion, and the sealing performance deteriorates.

Therefore, as shown in FIG. 8, an annular protrusion 101 is formed along the circumferential direction on the annular seal 100 to increase the contact pressure between the annular seal 100 and the surface to be sealed to improve the sealing performance. It has been proposed to improve it (see Japanese Utility Model Publication No. 60-34597).

[0004]

[Problems to be solved by the device]

 By forming an annular protrusion on the annular seal, the contact pressure between the annular seal and the surface to be sealed can be increased, but the contact area is smaller and the contact surface is along the circumferential direction. However, there is a problem in that the unevenness of surface roughness and distortion over the entire area cannot be sufficiently absorbed and the sealing performance is degraded.

An object of the present invention is to provide a liquid container capable of solving the above-mentioned problems of the conventional art.

[0006]

[Means for Solving the Problems]

 A feature of the present invention is that in a liquid container in which a cap is attached to the oil supply port of the liquid container main body via an annular seal, the annular seal has an annular protrusion that abuts at least one seal surface. It is formed, and the protrusion is at a point meandering in the circumferential direction.

[0007]

[Action]

 According to the configuration of the present invention, the contact pressure between the annular seal and the sealed surface is increased by forming the annular protrusion on at least one of the sealed surface and the annular seal. In addition, since the protrusion meanders in the circumferential direction, the contact area between the annular seal and the sealed surface becomes larger than that of the conventional one that follows the circumferential direction. The unevenness of surface roughness and the degree of strain absorption are increased.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

The oil tank 1 shown in FIGS. 1 and 2 is provided, for example, in a hydraulic circuit of a hydraulic power steering device, and includes a tank main body 2 for storing oil, and an oil tank 1 for storing oil in the tank main body 2. A pipe 5 forming an inflow port 3 and a pipe 6 forming an outflow port 4 for oil from the tank body 2 are provided. The tank body 2 is made of synthetic resin, and is formed by welding an upper member 7 and a lower member 8. The lower member 8 is integrally formed with the pipes 5 and 6. A peripheral wall 10 is integrally formed with the tank main body 2 on the bottom wall of the tank main body 2, and an oil outflow chamber 11 surrounded by the peripheral wall 10 is formed. The upper opening of the oil outflow chamber 11 is covered with a planar oil filter 12. The inflow port 3 opens to the side wall of the tank body 2 outside the oil outflow chamber 11, and the outflow port communicates with the oil outflow chamber 11.

A fuel filler port 20 is formed at the upper end of the tank body 2, and the fuel filler port 20 is opened and closed by a cap 22 having a level gauge 21. The cap 22 is made of synthetic resin formed by connecting the outer peripheral member 23 and the inner peripheral member 24, and the level gauge 21 is integrated with the inner peripheral member 24.

An upper portion of the inner peripheral member 24 has a large diameter portion 25 having a diameter larger than that of the fuel filling port 20, and a lower portion thereof has a small diameter portion 26 having a diameter smaller than that of the fuel filling port 20. Further, an inward flange 27 is formed on the outer periphery of the fuel filler port 20 so as to project inward in the radial direction. As a result, the lower surface of the large-diameter portion 25 and the upper surface of the inward flange 27 become the sealed surfaces 25a, 27a, and the rubber annular seal 28 is interposed between the sealed surfaces 25a, 27a. There is.

Further, a leaf spring 29 is attached to the inner peripheral member 24, and the leaf spring 29 is arranged along the radial direction of the fuel filler port 20, and its length is longer than the diameter of the fuel filler port 20. Has been. A notch 30 is formed in the inward flange 27 so that the leaf spring 29 can be inserted into the tank body 2. As a result, the leaf spring 29 is inserted into the tank body 2 through the notch 30 and then the cap 22 is rotated, whereby the leaf spring 29 and the cap 22 move inwardly toward the annular seal member 28 as shown in FIG. The flange 27 is sandwiched and the annular seal member 28 is pressed against the sealed surfaces 25a and 27a.

An annular protrusion 35 is formed on the upper surface of the annular seal 28. In this embodiment, the protrusions 35 have three threads and meander in the circumferential direction as shown in FIG. Further, each projection 35 is formed with a notch 35a for venting air. The notches 35a adjacent to each other are not arranged on the same diameter of the annular seal 28 to prevent oil from flowing out from the notches 35a.

According to the above configuration, the contact pressure between the annular seal 28 and the sealed surface 25a is increased by providing the protrusion 35, and the sealing performance is improved. Further, since the protrusion 35 meanders in the circumferential direction, the contact area between the annular seal 28 and the sealed surface 25a becomes larger than that in the circumferential direction, and the entire sealed surface 25a is covered. It is possible to prevent deterioration of sealing performance due to uneven surface roughness and increased strain absorption.

The present invention is not limited to the above embodiment. For example, although the projection 35 is formed on the upper surface of the annular seal 28 in the above embodiment, it may be formed on the lower surface or the upper and lower surfaces. Further, the number of the protrusions 35 may be less than three or more than three. Further, as shown in (1) of FIG. 5, the protrusions 35 may have two threads, and the meandering directions with respect to the circumferential direction on the same diameter may be opposite to each other. Further, as shown in (2) of FIG. 5, an annular protrusion 36 may be formed along the circumferential direction between the protrusions 35 meandering in the circumferential direction. Further, although the present invention is applied to the seal structure at the oil supply port of the oil tank in the above embodiment, the present invention is applicable to any seal structure in which the annular seal is interposed between the opposed surfaces to be sealed. You can

FIG. 6 shows an annular seal 28 according to a comparative example, and three protrusions 50 are formed on each of the upper and lower surfaces thereof, and each protrusion 50 is discontinuous in the circumferential direction. Further, the continuous portion of the protrusion 50 on the upper surface is a discontinuous portion of the protrusion on the lower surface, and the discontinuous portion of the protrusion 50 on the upper surface is a continuous portion of the protrusion 50 on the lower surface. Further, the discontinuous portions of the adjacent protrusions 50 are not arranged on the same diameter of the annular seal 28. Since the projection 50 is discontinuous in this way, it is not necessary to separately form an air vent passage. However, as in the conventional case, since each protrusion 50 is along the circumferential direction, it is not possible to sufficiently absorb the unevenness of surface roughness and strain of the contacted surface.

Further, the annular seal 28 according to the comparative example shown in (1) of FIG. 7 is composed of an O-ring, and the groove 56 into which the O-ring 28 is fitted has the large diameter portion 25 of the inner peripheral member 24 of the cap 22. Is formed in. Then, when the inner peripheral member 24 of the cap 22 is molded in the mold, the O-ring 28 is inserted into the mold and insert-molded, so that the sealing property between the cap 22 and the O-ring 28 is improved. We are trying to improve Further, as shown in (2) of FIG. 7, the cross-sectional shape of the O-ring 28 is made substantially triangular, and the contact pressure between the O-ring 28 and the sealed surface 27a of the inward flange 27 on the outer periphery of the fuel inlet 20 is increased. To improve the sealing performance. However, in this case, the cap forming process becomes complicated.

[0018]

[Effect of the device]

 According to the liquid container having the seal structure according to the present invention, the contact pressure between the annular seal and the surface to be sealed can be increased to improve the sealing performance, and the surface to be sealed has a non-uniform surface roughness. It is possible to prevent the sealing performance from deteriorating even if there is distortion or distortion.

[Brief description of drawings]

FIG. 1 is a plan view of a liquid container having a seal structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of a liquid container having a seal structure according to an embodiment of the present invention.

FIG. 3 is a partially enlarged view of a container according to an embodiment of the present invention.

FIG. 4 is a partial perspective view of an annular seal according to an embodiment of the present invention.

FIG. 5 is a partial plan view of an annular seal according to a modification.

FIG. 6 is a partial perspective view of an annular seal according to a comparative example.

FIG. 7 is a sectional view of a seal structure according to a comparative example.

FIG. 8 is a partial plan view of an annular seal according to a conventional example.

[Explanation of symbols]

 25a, 27a Sealed surface 28 Annular seal 35 Protrusion

Claims (1)

[Scope of utility model registration request] 1. In a liquid container in which a cap is attached to an oil supply port of a liquid container main body via an annular seal, the annular seal is formed with an annular protrusion that abuts at least one of the sealed surfaces, and the protrusion is circular. A liquid container having a seal structure characterized by meandering in the circumferential direction.