JPH088933Y2 - Reservoir for master cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a reservoir for a master cylinder of a vehicle brake system or clutch system.

[Conventional technology]

As an example of a conventional master cylinder reservoir
There is one disclosed in Japanese Patent Publication No. 62-127061. This one is
The switch case is provided with an umbrella portion that covers the upper end opening of the strainer to prevent hydraulic fluid from flowing out through the communication passage provided in the central portion of the reservoir cap due to fluctuations in the liquid level in the reservoir body due to vehicle vibration and the like. ing.

[Problems to be solved by the device]

By the way, in the above-mentioned conventional master cylinder reservoir, although the umbrella provided in the switch case can effectively prevent the hydraulic fluid in the strainer from flowing into the communication passage provided in the reservoir cap, The umbrella portion does not function effectively with respect to the hydraulic fluid that flows upward along the annular lip portion of the reservoir cap through the outer periphery of the strainer due to undulations, etc. May be leaked to.

The present invention has been made to address the above-mentioned problems, and accurately prevents, with a simple configuration, the hydraulic fluid that flows upward along the annular lip portion of the reservoir cap through the outer circumference of the strainer due to ripples or the like. The purpose is to completely suppress the outflow of hydraulic fluid due to fluctuations in the liquid level.

[Means for solving the problem]

In order to achieve the above-mentioned object, in the present invention,
The reservoir main body having an opening tubular portion above, an annular engaging portion surrounding the opening tubular portion from the outside, and an annular lip portion liquid-tightly contacting an inner peripheral surface of the opening tubular portion A reservoir cap that is elastically fitted to the tubular portion to close the opening of the reservoir body and has a communication passage in the central portion to communicate the inside of the reservoir body with the atmosphere; and a reservoir cap formed at the lower end of the opening tubular portion. A strainer that has an engaging portion that engages with the stepped portion and that is suspended inside the reservoir body; and a strainer that is assembled at the upper end in the center of the reservoir cap and that is suspended inside the strainer and that has the strainer upper end opening. A switch case having an umbrella portion for covering, and a lead switch built in the switch case by a permanent magnet provided on an inner peripheral portion of the switch case that is fitted to the lower outer periphery of the switch case so as to be vertically movable by a predetermined amount. In a master cylinder reservoir including a float for activating, an annular plate that comes into contact with the upper end of the strainer on the outer peripheral lower surface is provided in the switch case below the umbrella part of the switch case so as to be movable in the vertical direction. The upper surface of the outer periphery of the annular plate can contact the lower end of the annular lip of the reservoir cap.

[Function and effect of device]

In the master cylinder reservoir according to the present invention,
The annular plate of the reservoir cap is pushed upward by the hydraulic fluid itself which flows upward along the annular lip portion of the reservoir cap through the outer periphery of the strainer due to the upward movement of the strainer due to the vibration of the vehicle or the undulation. It abuts on the lower end of the part and adheres thereto. Therefore, the annular plate and the annular lip portion effectively suppress the inflow of hydraulic fluid that flows upward along the annular lip portion of the reservoir cap through the outer periphery of the strainer due to undulations or the like into the communication passage provided in the reservoir cap. be able to. In addition, the inflow of the hydraulic fluid from the inside of the strainer into the communication passage of the reservoir cap can be double suppressed by the annular plate and the umbrella portion of the switch case. Therefore, it is possible to completely prevent the hydraulic fluid contained in the reservoir body (including the strainer) from flowing out to the outside through the communication passage of the reservoir cap due to the liquid level fluctuation.

〔Example〕

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

The master cylinder reservoir 10 shown in FIG. 1 has an opening cylinder portion 11a at the upper side and has a grommet G on the master cylinder MC.
Resin reservoir body that is fixed in a liquid-tight manner via 1, G2
11, an elastic reservoir cap 12 and a resin strainer 13 mounted on the reservoir body 11, a switch case 14 mounted on the reservoir cap 12, a float 15
And so on.

The reservoir cap 12 is an opening tube portion 11 of the reservoir body 11.
A hook that surrounds a from the outside and is provided on the upper end of the open tubular portion 11a.
An annular engaging portion 12a that elastically engages with 11b and an opening tubular portion 11a.
A cylindrical portion 1 for supporting a switch case 14 and a communication hole 12c for communicating the inside of the reservoir body 11 with the atmosphere, which has an annular lip portion 12b that comes into liquid-tight contact with the inner peripheral surface of
Has 2d. An elastic cap cover 16 is attached to the top of the reservoir cap 12.

The strainer 13 is formed in a cup shape and has a net body 13a at the lower end, and a step formed at the lower end of the open tubular portion 11a of the reservoir body 11 by an engaging portion 13b formed by expanding the upper end of the strainer 13. It engages with the portion 11c from above and hangs inside the reservoir body 11. In addition, a notch (not shown) is provided in the engaging portion 13b, and the air in the reservoir body 11 flows through the notch.

The switch case 14 is elastically fitted to the cylindrical portion 12d of the reservoir cap 12 at the upper end, and an inclined recess 14a for forming a communication passage is formed on the outer periphery of the upper portion, and the inclined recess 14a and the reservoir. An umbrella portion 14b for preventing hydraulic fluid from flowing into a communication passage formed by the cylindrical portion 12d of the cap 12 is formed. In addition, the lower part of the switch case 14 has a step
14c and a small diameter portion 14d are formed, and a reed switch 17 is arranged in the small diameter portion 14d. The reed switch 17 is connected to a lead wire 18 that is led out from the reservoir cap 12 in a liquid-tight manner to the outside, and is connected to a liquid level warning display device (not shown).

The float 15 moves a predetermined amount in the vertical direction on the outer circumference of the small diameter portion 14d of the switch case 14 (from the position where it contacts the stepped portion 14c of the switch case 14 to the position where it contacts the clip 19 attached to the lower end of the small diameter portion 14d). The reed switch 17 is fitted to the reed switch 17 at a set position by a permanent magnet 21 provided on the inner periphery thereof.

Thus, in the present embodiment, the resin annular plate 22 is vertically movably assembled to the non-circular portion below the umbrella portion 14b of the switch case 14 through the non-circular mounting hole 22a. . The annular plate 22 is in contact with the upper end of the strainer 13 (the upper surface of the engaging portion 13b) on the lower surface of the outer periphery thereof, and the upper surface of the outer peripheral surface of the annular lip portion 12 of the reservoir cap 12.
It can come into contact with b. In addition, the annular plate 22,
A small protrusion 14e provided on the switch case 14 prevents the reservoir cap 12 from falling when the reservoir cap 12 is attached to or detached from the reservoir body 11.
(Refer to FIG. 2) In the master cylinder reservoir 10 configured as described above, the annular lip portion 12b of the reservoir cap 12 is passed through the outer periphery of the strainer 13 due to the upward movement of the strainer 13 due to the vibration of the vehicle or the undulation. The annular plate 22 is pushed upward by the hydraulic fluid itself flowing upward along the above, and abuts on the lower end of the annular lip portion 12b of the reservoir cap 12 to make close contact therewith. Therefore, the reservoir cap 12 is passed through the outer circumference of the strainer 13 due to waviness or the like.
The inflow of the hydraulic fluid, which flows upward along the annular lip portion 12b, into the communication passage provided in the reservoir cap 12 can be effectively suppressed by the annular plate 22 and the annular lip portion 12b. Further, the inflow of the hydraulic fluid from the inside of the strainer 13 into the communication passage of the reservoir cap 12 can be doubly suppressed by the annular plate 22 and the umbrella portion 14b of the switch case 14. Therefore, the working fluid stored in the reservoir body 11 (including the strainer 13) due to the fluctuation of the liquid level is stored in the reservoir cap.
Outflow to the outside through 12 communication passages can be completely suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged view showing a relationship between a switch case and an annular plate. Explanation of reference numerals 10 ... Reservoir for master cylinder, 11 ... Reservoir body, 11a ... Opening cylinder part, 11c ... Step part, 12 ... Reservoir cap, 12a ... Annular engagement part, 12b ... Annular lip part , 12
c ... communication hole, 12d ... cylindrical part, 13 ... strainer, 13b ...
… Engagement part, 14 …… Switch case, 14a …… Inclined recess, 1
4b ... Umbrella part, 15 ... Float, 17 ... Reed switch,
21 ... Permanent magnet, 22 ... Annular plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Katagiri, Toyota Town, Toyota City, Aichi Prefecture, 1st Toyota Automobile Co., Ltd. 56) References: Actual Development Sho 64-11875 (JP, U) Actual Public Sho 58-19970 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A reservoir main body having an open tubular portion at the top,
An annular engaging portion that surrounds the opening tubular portion from the outside and an annular lip portion that liquid-tightly contacts an inner peripheral surface of the opening tubular portion, and is elastically fitted to the opening tubular portion. A reservoir cap that closes the opening of the reservoir body and has a communication passage in the central portion to communicate the inside of the reservoir body with the atmosphere, and an engaging portion that engages with a step formed at the lower end of the opening tubular portion. And a switch case having a strainer that hangs down inside the reservoir main body, an umbrella part that is assembled at the upper end to the center of the reservoir cap and that hangs down inside the strainer and covers the upper end opening of the strainer, A float which is fitted to the outer periphery of the lower part of the switch case so as to be movable in the vertical direction by a predetermined amount and which operates a reed switch built in the switch case by a permanent magnet provided on the inner periphery thereof. In the star cylinder reservoir, an annular plate that comes into contact with the upper end of the strainer on the lower surface of the outer periphery is provided in the switch case below the umbrella portion of the switch case so as to be movable in the vertical direction. A master cylinder reservoir that can contact the lower end of the annular lip of the reservoir cap.