JPH042838Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid reservoir containing brake fluid to be supplied to, for example, a vehicle brake system.

In general, a fluid reservoir has a reservoir body filled with brake fluid, and by attaching the reservoir body to the master cylinder, brake fluid is supplied from the reservoir body into the master cylinder when the vehicle's brakes are applied, and when the brake is released. Sometimes it is configured to circulate brake fluid from the master cylinder into the reservoir body. and,
An oil fluid inlet is provided in the reservoir body for replenishing brake fluid, and the oil fluid inlet is normally covered by fitting a reservoir cap. If there is a gap in the fitting part between the reservoir cap and the oil inlet, brake fluid will leak out from the reservoir body while the vehicle is running, so a gap will be created in the fitting part. In order to prevent this from happening, a sealing member is interposed between the reservoir cap and the oil inlet.

Conventionally, this sealing member is formed of a circular sheet-shaped elastic member, and the reservoir cap is attached with the sealing member attached to the oil inlet. In order to prevent the reservoir cap from easily coming off from the oil inlet while the vehicle is running, the reservoir cap is connected with a bayonet that rotates and locks after being fitted into the oil inlet. It is becoming more and more like this.

However, in the conventional liquid reservoir configured as described above, when the reservoir cap is rotated when the reservoir cap is attached, the sealing member interposed between it and the oil inlet is subjected to frictional force. Therefore, it was deformed into an elliptical shape, resulting in a non-sealing member.

The present invention has been developed in view of the above points, and an object of the present invention is to provide a liquid reservoir that can prevent the sealing member from deforming when a reservoir cap is attached.

In order to achieve the above-mentioned object, the present invention includes a reservoir body filled with oil, an oil inlet protruding from the reservoir body, and an oil inlet that fits into the oil inlet and rotates. a reservoir cap that closes the oil inlet by closing the oil inlet; a sealing member having a breathing hole and provided between the reservoir cap and the upper end surface of the oil inlet; In a liquid reservoir having a breathing passage formed between a sealing member and an inner surface of the reservoir cap to communicate the inside of the reservoir cap with the outside, a tapered surface is formed on the inner circumferential surface of the upper end of the oil inlet. death,
The sealing member is formed of a circular elastic material,
On the outer circumferential side of the sealing member, an annular and plate-shaped pressed part that is pressed by the reservoir cap is formed on the upper end surface of the oil inlet, and a plurality of rows of pressed parts are formed on the upper surface of the pressed part. In addition to providing an annular protrusion, the pressed portion is provided with an annular radial positioning protrusion located on the lower surface radially inner than the outer circumferential edge of the pressed portion and abutting the tapered surface. A plurality of protruding walls for retaining the shape of the seal member are vertically provided on the inner surface of the portion at positions that are radially inward than the radial positioning protrusions of the seal member when the reservoir cap is closed. The member is characterized in that an engaging recess is formed in the member, with which each of the protruding walls engages.

With this configuration, the plate-shaped pressed portion of the sealing member made of an elastic material is pressed and held between the reservoir cap and the upper end surface of the oil inlet, and at this time, the radial positioning protrusion is The sealing member comes into contact with the tapered surface formed on the inner peripheral surface of the upper end of the liquid inlet to ensure sealing all around, and even when the reservoir cap is rotated, the sealing member is secured in the radial direction by the positioning protrusion. This prevents deformation. Furthermore, since the annular protrusion is provided on the upper surface of the pressed portion of the seal member, the pressed portion is prevented from being pressed so as to escape radially outward when the reservoir cap is rotated. do. Further, a plurality of protruding walls for retaining the shape of the seal member are vertically provided on the inner surface of the canopy portion of the reservoir cap, and each of the protruding walls engages with an engagement recess formed in the seal member, so that the seal member is retained. Ensures shape and prevents deformation of the seal member.

Embodiments of the present invention will be described below based on the drawings.

First, in FIGS. 1 and 2, reference numeral 1 indicates a reservoir body, and the inside of the reservoir body 1 is filled with brake fluid. An oil fluid inlet 2 for replenishing brake fluid is protruded from the upper end surface of the reservoir body 1. A flange portion 2A projecting outward is formed at the tip of the oil inlet 2, and a pair of bayonet grooves 3, 3 are formed on the outer peripheral surface of the flange portion 2A. 3 is formed to be inclined downward toward the groove end 3A, and a locking recess 4 is formed near the groove end 3A.

Next, in FIGS. 3 to 5, reference numeral 5 indicates a reservoir cap that covers the oil inlet 2. The reservoir cap 5 is composed of a circumferential body portion 5A and a canopy portion 5B, and a bayonet is attached to the inner wall of the circumferential body portion 5A. A projection 6 is provided. Then, with the bayonet protrusion 6 positioned in the bayonet groove 3, the reservoir cap 5 is fitted into the oil inlet 2, and the reservoir cap 5 is rotated to form a convex portion 7 provided on the bayonet protrusion 6. By locking the reservoir cap 5 into the locking recess 4, the reservoir cap 5 is attached to the oil inlet 2. In order to prevent a gap from being formed between the reservoir cap 5 and the flange portion 2A, a sealing member 8 made of a circular elastic member is interposed therebetween.

Here, the seal member 8 is an annular and plate-shaped cover whose outer peripheral side is pressed and held between the upper end surface of the flange portion 2A of the oil liquid inlet 2 and the inner surface of the canopy portion 5B of the reservoir cap 5. It becomes the pressing part 8A,
A plurality of stages of annular protrusions 9, 9, . An annular radial positioning projection 10 is formed. The radial positioning protrusion 10 is positioned so as to prevent the seal member 8 from moving radially outward by abutting against a tapered surface 2B formed on the inner wall at the upper end of the oil inlet 2. .
The sealing member 8 also has a radial positioning protrusion 1.
An annular groove 11 serving as an engagement recess is formed by folding back the intermediate portion, which is on the inner side of 0, downward, that is, toward the reservoir body 1. A plurality of protruding walls 12, 12... are vertically provided on the inner wall of the canopy part 5B of the reservoir cap 5, and the tip of each protruding wall 12 is inserted and engaged in the groove 11 when the reservoir cap 5 is attached. This prevents the seal member 8 from moving radially inward.

Further, in the figure, reference numeral 13 indicates a breathing hole provided in the seal member 8, and reference numerals 14 and 14 indicate breathing passages provided in the reservoir cap 5, so that the brake fluid in the reservoir body 1 may flow out from the master cylinder (not shown). , when the brake hydraulic fluid flows into the reservoir body 1 from the master cylinder, the outside air flows into the breathing hole 1.
3. The air is supplied and discharged through the breathing passage 14, so that the pressure within the reservoir body 1 is kept approximately constant.

The liquid reservoir of this embodiment configured as described above is attached to the master cylinder, and the reservoir body 1 is filled with brake hydraulic fluid, and when the brake is applied, this brake fluid is supplied to the brake system and the brake is released. Sometimes it is possible to recirculate brake fluid from the brake system.

When filling or replenishing the brake fluid into the reservoir body 1, the sealing member 8 and the reservoir cap 5 are removed from the oil fluid inlet 2 to open the lid, and the brake fluid is injected from the oil fluid inlet 2. inject. When this work is completed, the seal member 8 is attached to the oil inlet 2. In this case, the seal member 8 has a radial positioning protrusion 10 formed on the lower surface side of the pressed portion 8A on the tapered surface 2B. Position them so that they touch each other. After that, the reservoir cap 5 has its bayonet protrusion 6 connected to the oil inlet 2.
It is fitted into the bayonet groove 3 formed on the outer peripheral surface of the flange portion 2A. As a result, the inner wall of the canopy portion 5B of the reservoir cap 5 is brought into contact with the annular protrusion 9 of the sealing member 8, and the tip of each protruding wall 12 is inserted into the groove 11 of the sealing member 8. In this state, the reservoir cap 5 is rotated by a predetermined angle to fit the protrusion 7 into the locking recess 4, thereby completing the installation of the reservoir cap 5.

Here, when the reservoir cap 5 is rotated when it is installed, a force in the rotation direction is applied to the sealing member 8 held between the reservoir cap 5 and the flange portion 2A of the oil inlet 2. , attempts to deform the seal member 8. However, since the protruding wall 12 provided on the canopy 5B of the reservoir cap 5 is inserted into the groove 11 formed in the sealing member 8, the sealing member 8 is restricted by the protruding wall 12 and moves radially inward. Deformation is prevented. Also,
By compressing and deforming the plurality of rows of protrusions 9 provided on the upper surface of the pressed portion 8A of the seal member 8, the pressed portion 8A is prevented from being pressed so as to escape radially outward. Since the annular positioning protrusion 10 provided on the lower surface of the pressed portion 8A is in contact with the tapered surface, outward deformation of the seal member 8 in the radial direction is also prevented. In this way, the deformation of the seal member 8 inward and outward in the radial direction is reliably restricted, and the entire circumference of the pressed portion 8A is connected to the inner wall of the canopy portion 5B of the reservoir cap 5 and the flange portion of the oil inlet 2. It is maintained in a state where it is sandwiched between the upper surface of 2A and can exhibit good sealing performance.

In the above-mentioned embodiment, the reservoir cap 5 is attached to the oil inlet 2 by bayonet connection, but if the reservoir cap 5 is attached by rotating, for example, the reservoir cap 5 can be attached by screwing. It may be attached by other means such as.

As described above in detail, the liquid reservoir according to the present invention has a tapered surface formed on the inner circumferential surface of the upper end of the oil inlet, and a sealing member made of a circular elastic material. An annular and plate-shaped pressed portion is formed on the upper end surface of the oil inlet on the outer peripheral side, and is pressed by a reservoir cap, and a plurality of rows of annular protrusions are formed on the upper surface of the pressed portion. In addition, the pressed portion is provided with an annular radial positioning protrusion located on the lower surface radially inner than the outer circumferential edge and in contact with the tapered surface, and the inner surface of the canopy portion of the reservoir cap is provided with , a plurality of protruding walls for retaining the shape of the seal member are vertically provided at positions radially inward of the radial positioning protrusions of the seal member when the reservoir cap is closed; Since the structure forms an engagement recess with which the projecting wall engages, when the reservoir cap is mounted so as to sandwich the pressed portion of the seal member, the annular positioning protrusion comes into contact with the tapered surface of the oil inlet, The seal is reliably sealed all around, and
Even if a force is applied in the direction of deforming the elastic sealing member by rotating the reservoir cap when it is installed, the sealing member will not move in the radial direction because its positioning protrusion comes into contact with the tapered surface. The movement is regulated, and the multiple rows of annular protrusions provided on the upper surface of the pressed part prevent the pressed part from deforming outward in the radial direction, and the canopy of the reservoir cap By engaging the plurality of seal member shape-retaining projecting walls hanging from the inner surface of the seal member with the engagement recesses of the seal member, unnecessary deformation of the seal member is regulated and the seal member is always kept in a stable state. It is possible to maintain the shape, improve shape retention, and further improve sealing performance.

[Brief explanation of the drawing]

Figures 1 and 2 are a front view and a plan view of the main parts of the liquid reservoir, respectively, showing a state in which the reservoir cap is not installed. Fig. 3 is a cross-sectional view of the main parts of the liquid reservoir, showing a state in which the reservoir cap is installed, and Fig. 4. is a bottom view of the reservoir cap, and Figure 5 is the V in Figure 4.
- It is a sectional view in the direction of the arrow. 1...Reservoir body, 2...Oil liquid inlet, 2A
... Flange part, 2B ... Tapered surface, 5 ... Reservoir cap, 8 ... Seal member, 8A ... Pressed part, 10 ... Positioning projection, 11 ... Concave groove (engaging recess), 12 ... ...Protruding wall for sealing member shape retention, 1
3... Breathing hole, 14... Breathing passage.

Claims (1)

[Scope of utility model registration request] A reservoir body whose inside is filled with oil, an oil inlet protruding from the reservoir body, and an oil inlet that is fitted into and rotated to perform the oil inlet. a reservoir cap to be covered; a sealing member sandwiched between the reservoir cap and the upper end surface of the oil inlet and having a breathing hole; and a sealing member provided between the sealing member and the inner surface of the reservoir cap; In a liquid reservoir provided with a breathing passage formed to communicate between the inside and the outside, a tapered surface is formed on the inner peripheral surface of the upper end of the oil inlet, and the sealing member is formed of a circular elastic material. An annular and plate-shaped pressed portion that is pressed by the reservoir cap is formed on the upper end surface of the oil inlet on the outer peripheral side of the sealing member, and on the upper surface side of the pressed portion. A plurality of rows of annular protrusions are provided, and the pressed portion is provided with an annular radial positioning protrusion located on the lower surface radially inner than the outer peripheral edge of the pressed portion and abuts the tapered surface. A plurality of protruding walls for retaining the shape of the seal member are vertically provided on the inner surface of the canopy portion of the cap at positions that are radially inner than the radial positioning projections of the seal member when the reservoir cap is closed; A liquid reservoir characterized in that the sealing member is formed with an engagement recess into which each of the projecting walls engages.