JP2536124Y2 - Plug mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for mounting a plug in a hole of a housing using a C-shaped retaining ring.

[0002]

2. Description of the Related Art As a structure having a plug mounted in a hole of a housing, for example, there is a reservoir device incorporated in an antilock brake device. This reservoir device constitutes a storage chamber for temporarily storing brake fluid, and the storage chamber is defined in a hole of a housing by a piston, and a plug attached to an opening of the hole of the housing. The spring is compressed between the piston and the piston to urge the piston in the direction of decreasing the storage chamber volume.

[0003] Such a reservoir device is described in Japanese Patent Application No. 2-52638, which was an earlier application filed by the present applicant.

In such a reservoir device, a plug is fitted into an opening of a large-diameter hole provided in a housing, and then a lid for preventing the plug from being removed is fixed to the housing by bolts, thereby mounting the plug. It has a structure.

[0005]

However, in the above-described plug mounting structure in the reservoir device, the lid must be fixed with bolts while the plug is held in the large-diameter hole of the housing. There is a possibility that the workability of mounting the plug and, eventually, the workability of assembling the reservoir device may be deteriorated.

As a solution to such a problem, a method using a C-shaped retaining ring (generally called a "C-ring") can be considered. In this case, an annular groove is formed in the inner periphery of the hole of the housing, and after inserting the plug into the hole, the C-shaped retaining ring is inserted into the hole with the diameter reduced forcibly. By releasing the diameter reducing force of the retaining ring and fitting it into the annular groove, the plug can be prevented from coming off.

However, in such a mounting structure using a retaining ring, a special jig is used to forcibly reduce the diameter of the retaining ring while maintaining the posture of the retaining ring. , The workability is poor, and there is still a problem to be improved.

[0008] An object of the present invention is to provide a plug mounting structure in which a plug can be mounted with good workability using a C-shaped retaining ring.

[0009]

The plug mounting structure according to the present invention comprises a first annular groove formed on an outer peripheral portion of a cylindrical plug and an inner peripheral portion of a hole of a housing in which the plug is fitted. In a mounting structure for mounting the plug with a C-shaped retaining ring interposed between the formed second annular groove,
An annular inclined groove that is inclined with respect to the axis of the plug, is continuous with the first annular groove, is deeper than the first annular groove, and can be fitted with the retaining ring, at an outer peripheral portion of the plug. And a protrusion for preventing rotation of the retaining ring is provided inside the inclined groove.

[0010]

According to the plug mounting structure of the present invention, an annular inclined groove which is inclined with respect to the axis of the plug is formed in the outer peripheral portion of the plug, and a C-shaped retaining ring fitted in the inclined groove is inserted into the plug. By allowing the plug to move into an annular groove formed in the fitting portion between the plug and the housing, a simple operation of inserting the plug into the hole of the housing and rotating the plug while holding the retaining ring on the plug can be performed. The workability is improved as the mounting work.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

This embodiment is an example of application as a plug mounting structure of a reservoir device incorporated in an antilock brake device.

In FIG. 1, reference numeral 1 denotes a housing of a reservoir device. The housing 1 is provided with a small-diameter hole 1A and a large-diameter hole 1B continuously along an axis O. In the small-diameter hole 1A, a storage chamber R for brake fluid is defined by the piston 2, and the storage chamber R is
A communication hole (not shown) formed therein communicates with each component of the anti-lock brake device, so that the brake fluid flows in and out under the control of the anti-lock brake device. Note that seal members 3A and 3B are fitted around the outer periphery of the piston 2.

In the large-diameter hole 1B, a double cylindrical plug 4 with a bottom is attached by a C-shaped retaining ring 20, which will be described later. A guide rod portion 2A of the piston 2 is slidably guided, and a spring 6 is compressed and interposed between the outer cylinder of the plug 4 and the piston 2. A cap 7 is fitted in the center of the plug 4.

The outer peripheral portion of the plug 4 and the inner peripheral portion of the large-diameter hole 1B are formed with first and second annular grooves 4A and 1C facing each other, and between these annular grooves 4A and 1C. With the C-shaped retaining ring 20 interposed, the plug 4 is mounted in the large-diameter hole 1B. First
The depth D ₁ of the annular groove 4A in is a slightly larger value than the radius of the circle is a cross-sectional shape of the retaining ring 20, and the second
Has a similar depth or a slightly smaller depth.

The housing 1 has a second annular groove 1C.
A hole 1D communicating with the inside is formed.

An inclined groove 4B inclined with respect to the axis of the plug 4 (coincident with the axis O) is formed on the outer periphery of the plug 4.
Are formed. This inclined groove 4B intersects with the first annular groove 4A at a lower portion in FIG.
₂ is a value slightly larger than the diameter (wire diameter) of the circle which is the cross-sectional shape of the retaining ring 20. Also, this inclined groove 4B
2, a projection 4C as shown in FIG. 3 is provided at a position slightly shifted in the circumferential direction from the lower position in FIG.

In the reservoir device constructed as described above, the piston 2 urged leftward in FIG. 1 by the spring 6 slides in accordance with the amount of brake fluid stored in the storage chamber R. Thus, the antilock brake device functions as expected.

By the way, when attaching the plug 4,
The inclined groove 4B is used.

That is, first, as shown in FIGS. 2 and 3, the retaining ring 20 is fitted into the inclined groove 4B, and the projection 4C is located between both ends 20A and 20B. As a result, one end 20A of the retaining ring 20 is located at the intersection of the first annular groove 4A and the inclined groove 4B.

Thereafter, the plug 4 is moved to the left in FIG. 2 while the retaining ring 20 is fitted in the inclined groove 4B. In this case, the retaining ring 20 may be restrained in the radially inward direction by using a jig 30 as shown in FIG.

Then, the plug 4 is moved until the first and second annular grooves 4A and 1C face each other, and
The one end 20A of the “0” faces the second annular groove 1C.

Thereafter, the plug 4 is rotated about the axis O. Thereby, the retaining ring 20 is moved to the other end 20.
B is pushed in the circumferential direction by the protrusion 4C of the plug 4, and the first and second annular grooves 4A
And 1C.

When the retaining ring 20 has completely moved into the first and second annular grooves 4A and 1C, the mounting of the plug 4 is completed.

On the other hand, when removing the plug 4, a tool is inserted into the hole 1D of the housing 1, and the tool is used to push the retaining ring 20 in the direction of the inclined groove 4B and turn the plug 4 to tilt the retaining ring 20. It is moved into the groove 4.

The plug mounting structure of the present invention can be applied to a wide range of plug mounting structures for housings of various devices in addition to the above-described reservoir device.

[0027]

As described above, according to the plug mounting structure of the present invention, an annular inclined groove which is inclined with respect to the axis of the plug is formed in the outer peripheral portion of the plug, and fitted into the inclined groove. Since the C-shaped retaining ring is configured to be movable into an annular groove formed in a fitting portion between the plug and the housing,
By inserting the plug into the hole of the housing and rotating it while holding the retaining ring on the plug, the plug can be attached very easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state during the work of attaching the plug shown in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1A Small diameter hole 1B Large diameter hole 1C 2nd annular groove 4 Plug 4A 1st annular groove 4B Inclined groove 20 Retaining ring

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location F16J 13/02 F15B 1/06

Claims (1)

(57) [Scope of request for utility model registration] A first annular groove formed on an outer peripheral portion of a cylindrical plug and a second annular groove formed on an inner peripheral portion of a hole of a housing into which the plug fits. In the mounting structure for mounting the plug with a C-shaped retaining ring interposed therebetween, the outer peripheral portion of the plug is inclined with respect to the axis of the plug and is continuous with the first annular groove and the first annular groove. A plug mounting structure, wherein an annular inclined groove is formed which is deeper than the retaining ring so that the retaining ring can be fitted therein, and a projection for stopping the rotation of the retaining ring is provided inside the inclined groove.