JP2000103329A - Reservoir for hydraulic booster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reservoir for a hydraulic booster, which is capable of preventing the intrusion of air into a circuit including the hydraulic booster during the acceleration/deceleration of a vehicle, cornering or by the vibration of the vehicle. SOLUTION: In internal space of a reservoir 1, an upper/lower partition plate 12 is provided for dividing the internal space into upper and lower rooms 31 and 32 and having a liquid passage 18 for making the upper and lower rooms 31 and 32 communicate with each other. Fluctuation in a liquid height during the acceleration/deceleration of a vehicle, cornering or by the liquid level inclination of hydraulic fluid in the internal space caused by the vibration of the vehicle is suppressed by the upper/lower partition plate 12 and, thus, the intrusion of air through a liquid supply port 3 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reservoir for a hydraulic booster used in a vehicle brake system.

[0002]

2. Description of the Related Art For example, Japanese Patent Publication No.
-2012. The hydraulic fluid reservoir described in this publication has a configuration in which a hydraulic fluid reservoir for a hydraulic booster and a hydraulic fluid reservoir for a master cylinder are combined, and a hydraulic supply port connected to a hydraulic pump, A liquid return port connected to the outlet side of the booster.

[0003]

In this hydraulic fluid reservoir, the level of the hydraulic fluid stored in the internal space is inclined due to acceleration or deceleration of the vehicle, cornering, or vibration of the vehicle, and the level of the fluid is reduced. It fluctuates easily. Therefore, as in the case where the hydraulic fluid is supplied to the hydraulic pump, for example, when the level of the hydraulic fluid is inclined in a state where the amount of the hydraulic fluid is reduced and becomes lower than the upper end of the opening of the liquid supply port. Then, air in the internal space is sucked in from the liquid supply port side, whereby air may enter the hydraulic booster and hinder the operation of the hydraulic booster.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and can prevent air from being mixed into a brake circuit including a hydraulic booster due to acceleration or deceleration of a vehicle, cornering, or vibration of the vehicle. It is an object to provide a reservoir for a hydraulic booster.

[0005]

SUMMARY OF THE INVENTION The above object is achieved by a main body having an internal space for storing a working fluid therein, a liquid supply port connected to a hydraulic pump and formed below the main body, and a hydraulic pump. A hydraulic booster reservoir having a liquid return port connected to the outlet side of the hydraulic booster that receives a supply of pressurized hydraulic fluid, wherein:
The interior space was partitioned into an upper chamber and a lower chamber, and upper and lower partition plates having a liquid passage communicating between the upper chamber and the lower chamber were provided, and the liquid supply port was formed on the lower chamber side. A reservoir for a hydraulic booster, characterized in that:

That is, according to the present invention, there is provided an upper and lower partition plate in an internal space, which partitions the internal space into an upper chamber and a lower chamber, and has a liquid passage communicating between the upper chamber and the lower chamber. In this way, the inclination of the hydraulic fluid level in the internal space during vehicle acceleration or corner rigging, or due to vehicle vibration, is suppressed by the upper and lower partition plates, thereby suppressing fluctuations in the hydraulic fluid level in the internal space. Suppress. This prevents air from entering through the liquid supply port into the brake circuit including the hydraulic booster.

[0007]

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

FIGS. 1 and 2 show a reservoir for a hydraulic booster according to an embodiment of the present invention. The main body 2 of the hydraulic booster reservoir 1 is formed by phase welding the upper main body 2A and the lower main body 2B. A working fluid inlet 20 is formed in the upper part of the upper main body 2A, and a cap 22 is attached via a disc-shaped sealing member 21. At the bottom of the lower main body 2B, a liquid supply port 3 communicating with a hydraulic pump (not shown) and an outlet side of a hydraulic booster (not shown) for receiving a supply of hydraulic fluid pressurized by the hydraulic pump are connected. A liquid return port 4 is provided. On the side of the lower body, an auxiliary port 5 is provided for communicating with an automatic brake control device disposed between a master cylinder and a wheel cylinder (not shown). Although the brake fluid is returned to 1, the details thereof are omitted.

A cylindrical float housing 6 in which a float 8 for detecting the amount of hydraulic fluid is disposed is formed inside the bottom of the lower body 2B, and a guide piece 6a protruding inward is formed. Engage with the float 8 to guide the vertical movement of the float 8. A permanent magnet 7 is attached to a lower portion of the float 8, and when the float 8 descends due to a decrease in the amount of hydraulic fluid, the float 8 is magnetized by the permanent magnet 7 in a known manner.
Then, the reed switch 9 disposed on the same axis as the outer side of the bottom of the lower body 2B is operated.

The lower main body 2B is provided with an upper and lower partitioning plate 12 which divides an internal space into two upper and lower portions immediately above the float accommodating portion 6, and an inlet 20 is formed with the upper and lower partitioning plate 12 as a boundary. The upper internal space is
1. The lower internal space in which the liquid supply port 3 is formed is a lower chamber 32. The upper and lower partition plates 12 are arranged near the minimum liquid level of the working fluid stored in the internal space, and the lower end position thereof is brought into contact with a protrusion 6 b protruding upward from the upper end of the float accommodating portion 6 so that the lower end position is set. I can decide. As will be described later, the upper and lower partitioning plates 12 have a liquid passage 18 for communicating between the upper chamber 31 and the lower chamber 32.

FIGS. 3 to 5 show the upper and lower partition plates 12 described above.
The details are shown. A plurality (three in this embodiment) of reinforcing projections 13 are provided on the upper surface of the upper and lower partitioning plates 12, that is, the surface on the upper chamber 31 side, extending upward and in contact with the inner side wall of the lower main body 2B. ing. These reinforcing projections 13 are provided with projecting pieces 14 projecting inward of the internal space. Furthermore, upper and lower partition plates 1
A contact wall portion 15 that contacts the inner side wall of the lower main body 2B is formed on the entire side of the side surface of the lower body 2B. On the other hand, on the lower surface of the upper and lower partition plate 12, that is, on the surface on the lower chamber 32 side, a restricting portion 16 is provided at a position in contact with a substantially central portion of the upper surface of the float 8 in order to restrict the upward movement of the float 8 described above. The projection is formed.

The liquid passage 18 of the upper and lower partition plate 12 is
1 and the opening 18b for the lower chamber 32
Are formed in directions different from each other. That is, the opening 18 formed in the liquid passage 18 with respect to the lower chamber 32.
A cover 17 covering the through hole b is formed to project toward the upper chamber 31, and an opening 18 a for the upper chamber 31 is formed on the cover 17 on a plane intersecting the upper and lower partition plates 12. Accordingly, the two openings 18a and 18b are formed so as to be in different directions from each other.

The lower surface of the upper and lower partition plate 12 is formed as an inclined surface inclined at a predetermined angle with respect to the horizontal direction. In addition to the above-described liquid passage 18, the upper chamber 31 and the lower chamber are formed above the inclined surface. There is provided a breathing hole 19 which communicates with the air outlet 32. That is, when the working fluid is injected into the main body 2 after the upper and lower partition plates 12 are assembled, the working fluid is mainly introduced from the upper chamber 31 to the lower chamber 32 through the liquid passage 18. From 19, the air in the lower chamber 32 side is evacuated to the upper chamber 31 side. At this time, the above-mentioned air release is facilitated by the configuration in which the lower surface of the partition plate 12 is an inclined surface and the breathing hole 19 is provided in an upper portion thereof.

Referring to FIG. 1, the lower chamber 32 is provided with a filter section 11 for removing foreign matter in the working fluid flowing out of the fluid supply port 3 to a hydraulic pump (not shown). The filter portion 11 is housed in a filter receiving portion 10 formed at the bottom of the lower main body 2B, and the lower surface of the upper and lower partition plate 12 (the lower surface of the cover portion 17 in the present embodiment) is provided at the upper end of the shaft portion 11a. By contact, the filter unit 1
At the same time, the lower end position of the upper and lower partition plate 12 is determined.

Next, the operation and effect of this embodiment will be described.

The upper and lower partitioning plates 12 provided in the internal space of the reservoir 1 are arranged near the minimum liquid level of the working fluid, so that they operate when the vehicle is accelerated or decelerated, when cornering, or when the vehicle is vibrated. Even if the liquid surface of the liquid is inclined, the upper and lower partition plates 12 suppress the inclination of the liquid surface,
Thus, the fluctuation of the hydraulic fluid level in the internal space is suppressed. Accordingly, even if the amount of the hydraulic fluid is reduced, such as when the hydraulic fluid is supplied to the hydraulic pump, the liquid supply port 3
The bottom of the lower chamber 32 communicating with the opening 3a can always be filled with the working fluid, and the intrusion of air into the liquid supply port 3 is prevented.

At this time, the movement of the hydraulic fluid along the upper surface of the upper and lower partition plates 12 is largely prevented by the projecting pieces 14, and the fluid passage 18 is opened by the cover 17 on the upper chamber 31 side and the lower chamber 32 side. The movement of the hydraulic fluid between the upper chamber 31 and the lower chamber 32 via the liquid passage 18 is greatly restricted because the directions 18a and 18b are formed so as to be different from each other. Therefore, prevention of air from entering the liquid supply port 3 can be further ensured.

Further, the contact wall portion 15 of the upper and lower partition plates 12
The abutment member holds the horizontal posture of the upper and lower partition plates 12 by abutting against the side wall surface of the lower main body 2B, and also has a function of restricting liquid communication between the upper and lower partition plates 12 and the side wall surface of the lower main body 2B. The reinforcing projections 13 are for strengthening the posture of the upper and lower partitioning plates 12 and are slightly warped toward the side wall of the lower main body 2B along the extending direction thereof. The inner wall of the lower main body 2B is pressed to reinforce the horizontal posture holding of the upper and lower partition plates 12. The upper end portion 13a of the reinforcing projection 13 extends to a welded portion between the upper body 2A and the lower body 2B, and is formed on the inner wall of the upper body 2A when forming the upper body and the lower body 2B by fusion welding. The upper and lower partition plates 12 are integrated with the main body 2 by welding so as to match the lower ends of the projected ridges 23.

Although the embodiment of the present invention has been described above, the present invention is, of course, not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, a dedicated reservoir has been described as a reservoir for a hydraulic booster. However, the present invention is not limited to this. Good.

In the above embodiment, the liquid supply port 3 is formed at the bottom of the lower body 2B.
Even when the lower main body 2B is formed on the lower side wall portion on the lower chamber 32 side, the same effect as described above can be obtained.

[0022]

As described above, according to the reservoir for the hydraulic booster of the present invention, the inclination of the hydraulic fluid level in the internal space at the time of acceleration of the vehicle, corner rig, or due to the vibration of the vehicle. Therefore, it is possible to prevent fluctuations in the liquid level of the hydraulic fluid due to the above, thereby preventing air from being mixed into the brake circuit including the hydraulic booster through the liquid supply port.

[0023] According to the second aspect, the above-mentioned liquid level inclination suppressing action can be reliably performed.
According to the configuration of the eighth aspect, the movement of the hydraulic fluid on the upper surfaces of the upper and lower partition plates and the movement of the hydraulic fluid between the upper chamber and the lower chamber can be restricted.

Further, claim 4, claim 5, and claim 12 are provided.
According to the configuration of (1), the positioning and fixing of the upper and lower partition plates with respect to the main body can be reliably performed, and according to the configuration of (9) and (10), the inconvenience associated with the arrangement of the upper and lower partition plates can be easily eliminated. be able to. In addition, according to the configuration of claim 6 and claim 11, there is no need to separately provide a float movement restricting member and a filter positioning member.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire reservoir for a hydraulic booster according to an embodiment of the present invention.

FIG. 2 is a plan view of the inside of the lower main body.

FIG. 3 is a side sectional view of an upper and lower partition plate according to the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a rear view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reservoir for hydraulic booster 2 Main body 2A Upper main body 2B Lower main body 3 Liquid supply port 4 Liquid return port 8 Float 11 Filter part 12 Upper and lower partition plate 13 Reinforcement projection part 14 Projection piece 15 Contact wall part 16 Regulation part 17 Cover Part 18 Liquid passage 18a Opening to upper chamber 18b Opening to lower chamber 19 Breathing hole 31 Upper chamber 32 Lower chamber

Claims (12)

[Claims] 1. A main body having an internal space for storing hydraulic fluid therein, a liquid supply port connected to a hydraulic pump and formed below the main body, and a supply of hydraulic fluid pressurized by the hydraulic pump. A hydraulic booster reservoir having a liquid return port connected to the outlet side of the receiving hydraulic booster, wherein, in the internal space, the internal space is partitioned into an upper chamber and a lower chamber; A reservoir for a hydraulic booster, comprising an upper and lower partition plate having a liquid passage communicating between an upper chamber and a lower chamber, wherein the liquid supply port is formed on the lower chamber side. 2. The apparatus according to claim 1, wherein the upper and lower partition plates are arranged near a minimum liquid level of the hydraulic fluid stored in the internal space.
6. The reservoir for a hydraulic booster according to 4. 3. The reservoir for a hydraulic booster according to claim 1, wherein a projecting piece projecting inward of the internal space is provided on an upper surface of the upper and lower partition plates. 4. The hydraulic type according to claim 1, wherein a reinforcing projection extending upward and in contact with a side wall of the main body is provided on an upper surface of the upper and lower partition plates. Reservoir for booster. 5. The reservoir for a hydraulic booster according to claim 1, wherein a contact wall portion is formed on a side surface of the upper and lower partition plate to contact a side wall of the main body. . 6. The lower chamber is provided with a float that moves in accordance with the level of the working fluid stored in the internal space, and a lower surface of the upper and lower partition plates is provided on the lower surface so as to be above the float. The reservoir for a hydraulic booster according to any one of claims 1 to 5, further comprising a regulating portion for regulating movement. 7. The hydraulic booster according to claim 1, wherein the liquid passage has an opening for the upper chamber and an opening for the lower chamber which are formed in directions different from each other. Reservoir. 8. A through-hole, which is an opening to the lower chamber, is formed in the upper and lower partition plates, and a cover portion covering the through-hole is formed so as to protrude toward the upper chamber. 8. The reservoir for a hydraulic booster according to claim 7, wherein an opening for the hydraulic booster is formed on a plane intersecting the upper and lower partition plates. 9. The liquid according to claim 1, wherein the upper and lower partition plates have a breathing hole communicating between the upper chamber and the lower chamber in addition to the liquid passage. Reservoir for pressure booster. 10. The hydraulic doubler according to claim 9, wherein the lower surfaces of the upper and lower partition plates are inclined surfaces inclined at a predetermined angle with respect to the horizontal direction, and the breathing holes are provided above the inclined surfaces. Reservoir for force devices. 11. The lower chamber is provided with a filter section for removing foreign matter in the working fluid flowing out from the liquid supply port to the hydraulic pump, and the filter section is provided on a lower surface of the upper and lower partition plates. The reservoir for a hydraulic booster according to claim 1, wherein the reservoir is positioned by: 12. The main body is formed by mutually welding an upper main body and a lower main body, and the reinforcing protrusion extends to a welded portion between the upper main body and the lower main body, and an upper end portion of the main body is formed of the main body. 5. The reservoir for a hydraulic booster according to claim 4, wherein the reservoir is integrated with the main body by being melted and solidified when forming by welding.