JP3540135B2 - Hydraulic fluid reservoir for vehicles - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle hydraulic fluid reservoir that stores a hydraulic fluid serving as a working medium of a plurality of external operating devices.
[0002]
[Prior art]
For example, Japanese Utility Model Laid-Open No. 4-124577 discloses this type of conventional technology. Hereinafter, description will be made with reference to FIG.
[0003]
The hydraulic fluid reservoir is generally indicated by 1 and is connected to a tandem master cylinder 20 equipped with a hydro booster 30. The internal space of the main body 2 of the hydraulic fluid reservoir 1 includes a primary fluid chamber 9 that can communicate with a primary hydraulic chamber 24 of a tandem master cylinder 20 and a secondary fluid chamber that can communicate with a secondary hydraulic chamber 25 of the tandem master cylinder 20. It comprises a chamber 10, a float chamber 8 in which a float 11 that can move up and down in accordance with the amount of hydraulic fluid is arranged, and a booster-side liquid chamber 14 that is a reservoir for the hydro booster 30. The tandem master cylinder 20 is configured in a known manner, and a primary piston 22 and a secondary piston 23 are slidably inserted into a cylinder hole 21, and when the brake is operated, these two pistons 22, 23 are moved leftward in the drawing. , Brake hydraulic pressure is generated in each of the primary hydraulic chamber 24 and the secondary hydraulic chamber 25.
[0004]
The float chamber 8 and the primary liquid chamber 9 are defined by cylindrical guides 4 and 5 for guiding the float 11 up and down, and the float chamber 8 and the secondary liquid chamber 10 are separated from each other by walls 6 and 7. , Which can communicate with each other. Further, the primary-side liquid chamber 9 and the booster-side liquid chamber 14 are partitioned by the wall 13, and these can be communicated with each other. A permanent magnet 12 is provided below the float 11, and this and a reed switch 15 attached to the bottom of the main body 2 constitute a known liquid level detecting means. The hydraulic fluid stored in the booster side liquid chamber 14 is supplied to the hydro booster 30 via the supply port 16 by a suction action of a pump device (not shown), and the booster is supplied from the hydro booster 30 via the return port 17 when the brake is released. It is returned to the side liquid chamber 14.
[0005]
[Problems to be solved by the invention]
However, in the conventional hydraulic fluid reservoir 1 described above, the capacity of the booster-side liquid chamber 14 is larger than that of the other liquid chambers, and the supply port 16 extends outward from a part 2 a of the lower side wall of the booster-side liquid chamber 14. When the vehicle suddenly accelerates, suddenly brakes, or turns sharply when the amount of the hydraulic fluid stored in the booster side liquid chamber 14 is small, the booster fluid level is tilted. The working fluid in the side liquid chamber 14 moves, and the state of storage of the working fluid easily changes greatly. Then, there is a possibility that the liquid surface of the working fluid is located at a position lower than the upper end of the opening 16a of the supply port 16 on the side of the liquid chamber 14, so that not only the working fluid but also the air ( There is also a possibility that the air (air) will be sucked to generate air bubbles in the piping path, and the hydro booster 30 will not function properly. That is, since the amount of the working fluid sucked by the pump device is considerably large, a sufficient working fluid must be stored in the vicinity of the opening 16a of the supply port 16, but in the conventional working fluid reservoir 1, the working fluid is Storage conditions cannot be stabilized.
[0006]
Further, as an external operating device that replaces the hydro booster 30, referring to FIG. 4, a hydraulic device in the liquid chamber 14 is sucked by a pump device (not shown) and the discharge pressure is changed to the primary hydraulic pressure chamber of the tandem master cylinder 20. Similarly, in a case where the hydraulic fluid is supplied to the hydraulic fluid supplied to the primary hydraulic pressure chamber 24 when the hydraulic fluid sucked by the pump device contains air, the air is also applied to the primary hydraulic chamber 24. Intrusion would thus interfere with the operation of the brake system.
[0007]
The present invention has been made in view of the above-described problems, and prevents air from entering a piping route to an external operating device even when the amount of stored hydraulic fluid is small and its storage state changes due to a level inclination of the hydraulic fluid. An object of the present invention is to provide a working fluid reservoir for a vehicle that can be used.
[0008]
[Means for Solving the Problems]
The above problems are solved by a main body having an opening for injecting a working fluid serving as a medium of a plurality of external working devices and an internal space for storing the working fluid, and a pair of partition walls in the internal space, A float chamber provided with a float for liquid level detection that moves up and down in accordance with the amount of the hydraulic fluid, and one of the plurality of external operating devices partitioned on one side of the internal space with the float chamber as a boundary. A first chamber that can communicate with the primary hydraulic chamber of the tandem master cylinder, and a second chamber that is partitioned on the opposite side of the first chamber from the float chamber and can communicate with the secondary hydraulic chamber of the tandem master cylinder. such a second chamber, in the vehicle hydraulic fluid reservoir having a port for supplying the hydraulic fluid to an external operation device of the residual of the plurality of external actuation device, the bottom of the float chamber, the float chamber Also formed the small volume supply chamber, said port, the hydraulic fluid reservoir, a vehicle, characterized in that in communication with the supply chamber through a communication hole formed in the bottom of the feed chamber Will be resolved.
[0009]
According to the present invention, by forming a port for supplying the working fluid to the remaining external operating device through a communication hole formed in the bottom of the supply chamber so as to be able to communicate with the bottom of the float chamber, the remaining external operating device can be connected to the remaining external operating device. The air is prevented from entering. The float chamber in which the float serving as the liquid level detecting means is disposed has a minimum movement of the hydraulic fluid even when the liquid level of the hydraulic fluid is tilted due to acceleration or deceleration acting on the vehicle, and the state of storing the hydraulic fluid even in the internal space. Is the most stable area. Therefore, by forming the port so as to be able to communicate with the bottom of the float chamber, it is possible to stably supply the hydraulic fluid even when the storage amount of the hydraulic fluid is small, and in particular, the hydraulic fluid is smaller in volume than the float chamber. Since the port communicates with the supply chamber through the communication hole at the bottom of the supply chamber, it is possible to reliably prevent air from entering the piping path to the remaining external operation device.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a hydraulic fluid reservoir for a vehicle according to an embodiment of the present invention will be described with reference to FIGS.
[0011]
The hydraulic fluid reservoir according to the present embodiment is indicated as a whole by 31 and is connected to two bosses 51 and 52 of a tandem master cylinder, which is one of the external operating devices. The internal space of the main body 32 is mainly divided into three chambers by a pair of partition walls 37a and 37b. That is, a connection hole 49 is formed between the float chamber 38 defined between the pair of partition walls 37a and 37b, and the primary hydraulic chamber of the tandem master cylinder defined on one side of the internal space with the float chamber 38 as a boundary. A primary-side liquid chamber 39 as a first chamber that can be communicated via the first chamber, and a second hydraulic chamber of the tandem master cylinder which is partitioned on the opposite side of the internal space with the float chamber 38 as a boundary and can be connected via a connection hole 50. A secondary-side liquid chamber 40 as a second chamber is formed. Reference numeral 41 denotes one of the walls formed in the primary liquid chamber 39 (see FIG. 3).
[0012]
A float 42 that can move up and down in accordance with the amount of the hydraulic fluid is arranged in the float chamber 38, and its movement is guided by a guide portion 45 extending upward from the bottom of the float chamber 38. A permanent magnet 43 is provided at a lower portion of the float 42, and a reed switch 44 is mounted on a switch mounting portion 54 on the outside of the bottom of the main body 32 so as to face the permanent magnet 43. The liquid level detecting means is constituted. That is, when the permanent magnet 43 approaches the reed switch 44 to a predetermined position, the reed switch 44 is activated by the magnetic force from the permanent magnet 43, and a warning is issued to the outside that the liquid amount is insufficient. Note that the upper limit position of the float 42 is regulated by the bottom of the filter 36 disposed below the opening 33 of the main body 32, and the opening 33 is attached with a cap 35 via a disc-shaped sealing member 34. Is covered by
[0013]
At the bottom of the float chamber 38, a supply chamber 48 having a smaller volume than the float chamber 38 is formed adjacent to the switch mounting portion 54. The bottom of the supply chamber 48 is located at substantially the same height as the bottom 39 a of the primary liquid chamber 39 and the bottom 40 a of the secondary liquid chamber 40. Therefore, in the present embodiment, an external operating device different from the tandem master cylinder is used as a pump device in a brake system for automatic brake control, and a port 46 for supplying hydraulic fluid to the pump device is provided at the bottom of the supply chamber 46. ing. The pump device pressurizes and sends the hydraulic fluid sucked through the port 46 toward the primary hydraulic chamber of the tandem master cylinder, and drives the secondary piston with the pressurized hydraulic fluid, thereby moving the secondary piston to a predetermined wheel. A brake system is provided for applying a braking force and returning the hydraulic fluid to the internal space of the main body 32, that is, the primary side liquid chamber 39 via the primary hydraulic pressure chamber.
[0014]
As shown in FIG. 3, the port 46 is formed so as to be offset with respect to the installation portion of the switch mounting portion 54, and protrudes from the switch mounting portion 54 on the side opposite to the reed switch insertion opening 52a. The inside of the port 46 communicates with the supply chamber 48 via the communication hole 47 (see FIG. 2).
[0015]
With the above configuration, according to the present embodiment, the movement of the hydraulic fluid due to acceleration or deceleration acting on the vehicle is minimized, and the state of storing the hydraulic fluid is the most stable in the internal space of the main body 32. The port 46 for supplying the hydraulic fluid to the pump device in the automatic brake control brake system is provided so as to be able to communicate with the bottom of the float chamber 38. Therefore, when the amount of the hydraulic fluid stored is small, the vehicle is rapidly accelerated, suddenly braked or suddenly braked. Even if the liquid level is instantaneously greatly inclined due to turning or the like, the liquid level does not reach a position lower than the opening of the port 46, that is, the communication hole 47. Therefore, it is possible to stably supply the hydraulic fluid without allowing air to enter the piping path, and to allow the automatic brake control brake system to always function normally.
[0016]
Particularly, in the present embodiment, the supply chamber 48 is provided at a position lower than the bottom of the float chamber 38, and the hydraulic fluid is further communicated with the port 46 through the communication hole 47 formed at the bottom. A sufficient amount of liquid can be ensured from the inside of the port 38 to the inside of the port 46.
[0017]
Further, according to the present embodiment, the port 46 is formed so as to be offset with respect to the installation portion of the switch mounting portion 54, and is formed so as to protrude from the switch mounting portion 54 on the side opposite to the reed switch insertion opening 52a. Therefore, there is no hindrance to the mounting work of the reed switch 44.
[0018]
Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical idea of the present invention.
[0019]
For example, in the above-described embodiment, the pump device in the automatic brake control brake system has been described as an example of the remaining external operating device. However, instead of the pump device, a pump device for supplying a hydraulic fluid to the hydro booster as in the related art. May be applied. In this case, a return port for returning the hydraulic fluid from the hydro booster may be formed, for example, so as to communicate with the float chamber 38.
[0020]
In the above embodiment, the hydraulic fluid reservoir 31 that supplies the hydraulic fluid to the tandem master cylinder and the pump device in the automatic brake control system is described as the external operating device. The pipe may be branched from the end, and the hydraulic fluid may be supplied to a pump device in an automatic brake control system on one side and a pump device for a hydro booster on the other side.
[0021]
As described above, according to the hydraulic fluid reservoir for a vehicle of the present invention, the movement of the hydraulic fluid due to acceleration or deceleration acting on the vehicle is minimized, and the state of storing the hydraulic fluid is the most stable in the internal space of the main body. A supply chamber having a smaller volume than that of the float chamber is formed at the bottom of the float chamber, and a port for supplying hydraulic fluid to the remaining external operating equipment is connected to the supply chamber through a communication hole formed at the bottom of the supply chamber. since communicated to, rapid acceleration of the vehicle when a small amount of stored hydraulic fluid, the liquid level by sudden braking or sudden turning or the like even be momentarily increased inclination, to penetrate the air in the pipe path The working fluid can be supplied stably without the need for the working fluid, and the external working device can always function normally.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an entire vehicle hydraulic fluid reservoir according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line [2]-[2] in FIG.
FIG. 3 is a bottom view of the hydraulic fluid reservoir for the vehicle.
FIG. 4 is a sectional view showing the whole of a conventional hydraulic fluid reservoir for a vehicle.
[Explanation of symbols]
31 Hydraulic fluid reservoir 32 Main body 33 Opening 37a Partition wall 37b Partition wall 38 Float chamber 39 Primary liquid chamber (first chamber)
40 Secondary side liquid chamber (second chamber)
42 float 43 permanent magnet 44 reed switch 46 port
47 Communication hole
48 supply chamber 54 switch mounting part

Claims (5)

A main body having an opening for injecting a working fluid serving as a medium for a plurality of external working devices and an internal space for storing the working fluid, and a compartment partitioned by the pair of partition walls in the internal space, and the inside of the A float chamber provided with a float for liquid level detection that moves up and down in accordance with the amount of liquid; and a tandem master partitioned on one side of the internal space by the float chamber and being one of the plurality of external operating devices. A first chamber communicable with a primary hydraulic chamber of the cylinder, and a second chamber partitioned on the opposite side of the float chamber from the first chamber and communicable with a secondary hydraulic chamber of the tandem master cylinder. A hydraulic fluid reservoir for a vehicle having a port for supplying the hydraulic fluid to the remaining external operating devices of the plurality of external operating devices,
A supply chamber having a smaller volume than the float chamber is formed at the bottom of the float chamber, and the port communicates with the supply chamber through a communication hole formed at the bottom of the supply chamber. A hydraulic fluid reservoir for a vehicle. The hydraulic fluid reservoir for a vehicle according to claim 1, wherein the port is provided at a position lower than bottoms of the first chamber and the second chamber. The remaining external operating device is a pump device that pressurizes and sends out the hydraulic fluid, and the pressurized fluid pressurized by the pump device is supplied to a primary hydraulic chamber of the tandem master cylinder. The hydraulic fluid reservoir for a vehicle according to claim 1 or 2, wherein the hydraulic fluid reservoir is used for a brake system that is returned to the internal space via a primary hydraulic chamber. A permanent magnet is provided at a lower portion of the float, and a switch is provided on the bottom of the float chamber, the switch being opposed to the permanent magnet and being activated by approaching a predetermined position. The hydraulic fluid reservoir for a vehicle according to any one of claims 1 to 3, wherein the reservoir is formed so as to be offset from the hydraulic fluid reservoir. 5. The vehicle according to claim 4 , wherein a switch mounting portion having an insertion port for the switch formed on one end side is provided outside the bottom of the main body, and the port is formed so as to protrude on a side opposite to the insertion port. Hydraulic fluid reservoir.

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