JP2005132226A - Reserver for master cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reserver for a master cylinder hardly to generate an air suck-in phenomenon even if a variation in the level of working liquid occurs and capable of supplying the working liquid stably to the master cylinder. <P>SOLUTION: The reserver R to supply the working liquid to the master cylinder MA mounted on a dash panel which partitions a cabin from a space under a hood in front of a wind shield is equipped with a reserver body 1 to store the working liquid, formed separately from the master cylinder MA, and installed in a position in the space under a hood and above the master cylinder MA and supply ports 6a and 6b leading to the master cylinder MA, wherein the supply ports 6a and 6b have communication paths 8 in a straight line viewing at the side and are extended into the reserver body 1, while their openings 7a and 7b are opened at the center of the direction fore and aft of the vehicle body in the reserver body 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a master cylinder reservoir (brake master cylinder or clutch master cylinder), and more particularly to a master cylinder reservoir that reliably prevents air from being sucked into the master cylinder.

  Conventionally, the reservoir for the master cylinder is provided integrally with the master cylinder, or is provided separately from the master cylinder, and is provided separately from the master cylinder and connected by piping such as a hose. The thing of a structure is known (for example, refer patent document 1).

By the way, as a design trend in recent automobiles, there is a demand for a wide compartment and engine room, and in order to achieve the demand, the hood hood and the windshield may be gently inclined. In order to meet such a design requirement, it is convenient that the master cylinder and the master cylinder reservoir have a separate structure.
In other words, in order to widen the passenger compartment, it is desirable that the position of the lower end portion of the windshield be formed long toward the front of the vehicle body, and in consideration of maintainability and impact resistance at the time of collision, the master It can be said that the cylinder reservoir is preferably installed at a position close to the hood hood near the upper part of the engine room.

On the other hand, considering the installation space of the negative pressure booster connected to the master cylinder, it is desirable that the master cylinder is attached using the space around the dash panel that partitions the vehicle compartment and the space under the hood in front of the windshield.
In such an arrangement structure, as shown in FIG. 4A, the master cylinder reservoir R1 is provided at the lower rear end of the reservoir main body 30 where the hydraulic fluid output port 31 is located close to the master cylinder. . The master cylinder reservoir R1 is disposed at a position close to the bonnet hood as described above. This position is also a space where an engine or the like is disposed immediately below. Cannot take a lot of space. Therefore, the master cylinder reservoir R1 tends to be flat.
Japanese Patent Laying-Open No. 2003-40098 (paragraph 0009, FIG. 1, etc.)

  In the conventional master cylinder reservoir R1, as shown in FIG. 4A, the hydraulic fluid output port 31 is provided at the lower portion of the rear end of the reservoir main body 30, so that in the normal state, the hydraulic fluid 15 The internal opening 31a of the output port 31 is disposed under the surface 15b, and the internal opening 31a is hidden under the liquid surface 15b. However, for example, when driving on a steep downhill or during high G braking where a large load is input, the liquid level 15b fluctuates and the internal opening 31a of the output port 31 is exposed as shown in FIG. In some cases, air Ai is sucked into the master cylinder side through the hose H from the internal opening 31a, and the operation of the master cylinder may be defective. Such a phenomenon of air Ai suction due to the fluctuation of the liquid level 15b is likely to occur remarkably in the master cylinder reservoir R1 formed in a flat shape.

  Therefore, the present invention provides a master cylinder reservoir that is unlikely to cause air suction even when the fluid level of the hydraulic fluid changes, and that can stably supply the hydraulic fluid to the master cylinder. And

  A reservoir for a master cylinder according to claim 1 of the present invention that has solved the above problems is a master for supplying hydraulic fluid to a master cylinder that is attached to a dash panel that partitions a vehicle compartment and a space under the hood in front of the windshield. A cylinder reservoir that stores hydraulic fluid to be supplied to the master cylinder, is configured separately from the master cylinder, and is located in the space under the hood at a position in front of the windshield and the vehicle body of the master cylinder. A reservoir body disposed at a position above the master cylinder, and a hose joint provided on the rear side of the vehicle body of the reservoir body and connected to a hydraulic fluid supply hose connected to a replenishment port of the master cylinder. A supply port having a portion, and the supply port is linear in a side view With a communication path is extended into the inside of the reservoir body, characterized in that the opening is open to the central portion of the vehicle body front-rear direction of the reservoir body. Here, the central portion includes a central portion of the reservoir main body in the longitudinal direction of the vehicle body and a portion near the central portion.

  According to the first aspect of the present invention, the reservoir body that stores the hydraulic fluid supplied to the master cylinder is configured separately from the master cylinder, and is disposed in the space under the hood at the front position of the vehicle body of the windshield and the master cylinder. Is done. The reservoir body is disposed at a position above the master cylinder, and has a hose joint portion to which a hydraulic fluid supply hose connected to the replenishment port of the master cylinder is coupled to the rear body side of the reservoir body. Since the supply port is provided, the hydraulic fluid is supplied from the reservoir body to the master cylinder via the hose.

The supply port has a linear communication path in a side view and is extended into the interior of the reservoir body, and its opening is opened at the central portion of the reservoir body in the longitudinal direction of the vehicle body. Such effects can be obtained.
In other words, the level of the hydraulic fluid in the reservoir body may fluctuate (tilt) when driving on a steep downhill or during high G braking when a large load is input. For example, the central portion of the reservoir body in the front-rear direction of the vehicle body is smaller than the rear body side of the reservoir body, for example. That is, if the opening is opened on the rear side of the vehicle body of the reservoir body, the opening may be exposed due to a change in the liquid level, and air may be sucked from the opening. On the other hand, in the reservoir for a master cylinder according to claim 1, the supply port has a linear communication path in a side view and extends into the reservoir body, and its opening is in the reservoir body. Since the opening is provided at the central portion in the longitudinal direction of the vehicle body, even if the liquid level of the hydraulic fluid changes as described above, the opening is easily disposed below the liquid level and is not easily exposed.
Therefore, there is no possibility that air is sucked from the opening, and the working fluid can be supplied to the master cylinder in a stable state.

  In addition, since the supply port has a linear communication path in a side view, an advantage is obtained in that it is difficult for air to accumulate in the communication path and that air is not easily sucked into the master cylinder.

  According to a second aspect of the present invention, in the master cylinder reservoir according to the first aspect, the hose joint portion of the supply port has a hose retaining portion whose end is expanded, and a connection angle of the hose. The center axis of the communication path is inclined with respect to the center axis of the outer diameter so that the center axis of the communication path approaches the horizontal.

According to invention of Claim 2, since the said hose joint part of a supply port has the hose extraction prevention part by which the edge part was expanded, it becomes difficult for a hose to fall out, and also an edge part is expanded. Therefore, there is an advantage that air is hardly generated in this portion.
Furthermore, since the central axis of the communication path is inclined with respect to the central axis of the outer diameter so that the central axis of the communication path is closer to the horizontal than the connection angle of the hose, the hose joint portion supplies hydraulic oil. A feasible hose connection angle can be ensured and the horizontality of the communication path can be obtained. As a result, the opening of the communication path can be disposed at a low position inside the reservoir body, and the opening of the communication path is more difficult to be exposed even when the liquid level of the working fluid varies. Accordingly, it is possible to realize a more stable supply state of the hydraulic fluid.
In addition, since the opening of the communication path can be disposed at a low position inside the reservoir body, it is effective when the reservoir body has a flat shape.

  According to the present invention, even if the liquid level of the hydraulic fluid fluctuates, the air suction phenomenon hardly occurs, and the hydraulic fluid can be stably supplied to the master cylinder.

  Hereinafter, details of a reservoir for a master cylinder according to an embodiment of the present invention will be described with reference to the drawings. In the following description, “front and rear”, “left and right”, and “up and down” are based on the state in which the reservoir for the master cylinder is attached to the vehicle body of the automobile.

  In the drawings to be referred to, FIG. 1 is a schematic layout diagram (partial cross section) of a front part of a vehicle body for explaining a master cylinder reservoir according to an embodiment of the present invention, and FIG. FIG. 2B is a partial cross-sectional explanatory view showing the master cylinder reservoir and the master cylinder. The cross section of the master cylinder reservoir in FIG. 2 (b) is based on the line bb in FIG. 2 (a).

  As shown in FIG. 1, the master cylinder reservoir R is disposed in a space S (recessed portion) below the hood hood BH in front of the windshield FG provided in the vehicle body T of the automobile, and the vehicle body T is mounted by a fixture (not shown). Is attached. A master cylinder MA is provided at an obliquely lower position behind the master cylinder reservoir R, and the master cylinder reservoir R and the master cylinder MA are connected by a hose H. That is, the master cylinder reservoir R is disposed above the master cylinder MA in the space S below the hood hood BH, and the hose H is inclined downward from the master cylinder reservoir R toward the master cylinder MA. Is provided. In the figure, reference numerals P1 and P2 indicate the replenishment port of the master cylinder MA.

  The master cylinder MA is attached to a negative pressure booster BA, and this negative pressure booster BA is attached to a dash panel PA that partitions the vehicle compartment C and the space S in front of the windshield FG. An operating force from a brake operating member such as a brake pedal (not shown) is input to the negative pressure booster BA, and the master cylinder MA is illustrated based on the operating force input to the negative pressure booster BA. The wheel brake is not activated.

  As shown in FIG. 2 (b), the master cylinder reservoir R is composed of an upper body 1a and a lower body 1b, and is made of a resin reservoir body 1 that constitutes a storage chamber for storing brake fluid (working fluid) 15. And a cap 1c for closing the brake fluid inlet 2 provided on the upper portion of the upper body 1a. The upper main body 1a and the lower main body 1b are integrally connected by welding or the like, as shown in FIG. 2 (a), are substantially L-shaped in plan view, and as shown in FIG. 2 (b), It is formed in a flat shape when viewed from the side (only the lower main body 1b is shown in FIG. 2A). Below the master cylinder reservoir R, as shown in FIG. 1, an engine E, a transmission (not shown) or the like, peripheral devices thereof, an electric motor in place of the engine E, or the like is provided.

  As shown in FIG. 2A, the lower main body 1b is provided with a partition wall 3 having a circular shape in plan view and a partition plate 4 for partitioning the left and right into two rooms A and B. The partition wall 3 is provided with a plurality of communication grooves 3 a so that the brake fluid 15 can flow between the rooms A and B. In the present embodiment, the room A is formed larger than the room B, and the amount of storage of the brake fluid 15 is increased. A float, a filter, etc. (not shown) are arranged in a circular space in plan view partitioned by the partition 3.

  Tubular supply ports 6a and 6b having hose joint portions 5a and 5b to which the hoses H and H can be connected are provided on the rear body side of the lower body 1b. As shown in FIG. 2A, the supply ports 6a and 6b are respectively extended inside the rooms A and B of the lower main body 1b, and the openings 7a and 7b are formed in the lower main body 1b (reservoir main body). It is opened in the central part (the central part vicinity part) of the vehicle body front-back direction in 1).

Here, since each supply port 6a, 6b is made into the same structure, the one supply port 6a is demonstrated with reference to FIG.2 (b).
The supply port 6a has a linear communication passage 8 in a side view, and in this embodiment, the central axis O1 is inclined so as to be closer to the horizontal than the connection angle of the hose H. That is, the communication path 8 of the supply port 6a has a horizontal inclination angle of the central axis O1 that is more horizontal than the inclination angle of the central axis O2 of the outer diameter D1 (see FIGS. 3A and 3B) of the hose joint portion 5a. And the central axis O1 and the central axis O2 are different from each other. In other words, the central axis O1 of the outer diameter D1 of the hose joint portion 5a is eccentrically inclined with respect to the central axis O2 of the communication path 8. Specifically, the hose H is connected to the hose joint part 5a at an inclination angle of 10 degrees with respect to the horizontal, and the communication path 8 has an inclination angle of 5 degrees with respect to the horizontal. Is set to In the present embodiment, the supply ports 6a and 6b are provided integrally with the lower body 1b, and partially form the bottom surface of the lower body 1b. The supply ports 6a and 6b may be formed separately from the lower body 1b and fixed to the lower body 1b.

  Here, as shown in FIG. 2B, a predetermined amount of brake fluid 15 is stored in the reservoir main body 1, and in the normal state shown in FIG. The liquid portion 15a (in the liquid) and the air portion 16 (in the air) where the air exists are divided. In addition, the code | symbol 15b in the figure has shown the liquid level of the brake fluid 15. FIG. That is, the openings 7a and 7b of the supply ports 6a and 6b are arranged in the brake fluid portion 15a.

  By the way, since the positions of the hose joint portions 5a and 5b are provided at the rear end of the reservoir body 1, the inclination angles of the supply ports 6a and 6b need to be as close to a horizontal state as possible. On the other hand, the hose joint portions 5a and 5b have a limit in making the angle close to horizontal in order to prevent air (bubbles) from accumulating at the boundary portion between the hoses H and H. Thus, by providing the hose joint portions 5a and 5b with an inclination as described above, air accumulation is prevented and a smooth flow of the brake fluid 15 can be realized.

The supply ports 6a and 6b may be provided on the bottom surface side of the reservoir body 1 so that a part or almost the whole protrudes. With this configuration, the openings 7a and 7b of the supply ports 6a and 6b can be brought closer to the bottom surface of the reservoir body 1, and the openings 7a and 7b are more reliably connected to the brake fluid portion 15a. Will be placed.
In this case, the supply ports 6a and 6b and the hoses H and H are provided so as not to interfere with the engine E and the like provided below the reservoir body 1.

  At the end portion of the hose joint portion 5a, a hose retaining portion 9 that is expanded in a flare shape is provided. The hose H is attached to the hose joint part 5a by the band member 10 so as not to be engaged and disengaged.

Next, the operation in the embodiment of the present invention will be described.
As shown in FIG. 3A, in the normal state, the liquid level 15b of the brake fluid 15 is substantially horizontal, and the openings 7a and 7b of the supply ports 6a and 6b are below the liquid level 15b. (Brake fluid portion 15a (see FIG. 2B)). Accordingly, the openings 7a and 7b are not exposed from the liquid surface 15b, and air is not sucked into the hoses H and H via the supply ports 6a and 6b.

Here, for example, when a large load close to 1G is input to the vehicle body T (see FIG. 1), for example, during a steep downhill run or high G brake, the reservoir as shown in FIG. The liquid level 15b of the brake fluid 15 in the main body 1 fluctuates (in the drawing, a steep downhill time is schematically shown. In addition, at the time of high G braking, the liquid level 15b fluctuates in an upward slope toward the front of the vehicle body. To do). However, even in this case, the openings 7a and 7b are located below the liquid level 15b where the brake fluid 15 fluctuates, and are not exposed from the liquid level 15b.
Therefore, air is not sucked from the openings 7a and 7b, and the brake fluid 15 can be supplied to the master cylinder MA in a stable state.

According to the master cylinder reservoir R described above, the supply ports 6a and 6b have linear communication passages 8 and 8 in a side view and extend into the interior of the reservoir body 1, and the openings thereof. Since the openings 7a and 7b are opened at a substantially central portion of the reservoir body 1 in the longitudinal direction of the vehicle body, the following advantages can be obtained.
In other words, the level 15b of the brake fluid 15 in the reservoir body 1 may fluctuate (see FIG. 3 (b)) when driving on a steep downhill or during high G braking where a large load is input. The amount of variation is not uniform inside the reservoir body 1, and is smaller, for example, in the central portion of the reservoir body 1 in the longitudinal direction of the vehicle body than in the vehicle body rear side of the reservoir body 1. In other words, if the opening is configured to open to the rear side (rear end) of the reservoir body 1, the opening is exposed due to fluctuations in the liquid level 15b, and air is sucked in. There is a fear.
On the other hand, in the master cylinder reservoir R of the present embodiment, the supply ports 6a and 6b have linear communication passages 8 and 8 extending in the reservoir body 1 in a side view, Since the openings 7a and 7b are opened at a substantially central portion of the reservoir body 1 in the longitudinal direction of the vehicle body, even if the liquid level 15b of the brake fluid 15 is changed as described above, the openings 7a and 7b There is no risk of exposure due to the state of being placed below the liquid surface 15b.
Accordingly, air is not sucked from the openings 7a and 7b, and as a result, the brake fluid 15 can be stably supplied to the master cylinder MA.

  Further, since the supply ports 6a and 6b have linear communication passages 8 and 8 when viewed from the side, air accumulation is less likely to occur inside the communication passages 8 and 8, and air is sucked into the master cylinder MA. The advantage is that this is unlikely to happen.

Furthermore, since the hose joint portions 5a and 5b of the supply ports 6a and 6b have hose retaining portions 9 and 9 whose ends are expanded, the hoses H and H are difficult to come off, and the end portions are Since it is expanded, there is an advantage that air is not easily accumulated in this portion.
Further, the hose joint portions 5a and 5b are connected to the communication passages 8 and 8 with respect to the central axis O2 of the outer diameter D1 so that the central axis O1 of the communication passages 8 and 8 becomes closer to the horizontal than the connection angle of the hoses H and H. Since the central axis O1 is inclined, a connection angle between the hoses H and H that can supply the brake fluid 15 can be secured, and the horizontality of the communication passages 8 and 8 can be obtained. As a result, the openings 7a and 7b of the communication passages 8 and 8 can be disposed at a low position inside the reservoir body 1, and the communication passages 8 and 8 can be provided even when the liquid level 15b of the brake fluid 15 varies. The openings 7a and 7b are more difficult to be exposed. As a result, a more stable supply state of the brake fluid 15 can be realized.
Further, since the openings 7a and 7b of the communication passages 8 and 8 can be disposed at a low position inside the reservoir body 1, in the reservoir R for master cylinder in which the shape of the reservoir body 1 is flat. It is particularly effective to provide such an inclination.

  As mentioned above, although embodiment which concerns on this invention was described, it cannot be overemphasized that this invention is not limited to these, and can change suitably according to the main point of invention. For example, the shape of the reservoir body is not limited to that described in the above embodiment, and various shapes such as a vertically long shape and an elliptical shape can be adopted. Further, the number of supply ports may be one, or three or more. Furthermore, in the present embodiment, the brake master cylinder has been described, but a clutch master cylinder may be employed.

FIG. 3 is a schematic layout diagram of the front portion of the vehicle body for explaining the master cylinder reservoir according to the embodiment of the present invention. (A) is the top view which represented the principal part which shows the reservoir | reserver for master cylinders, and a master cylinder by the cross section, (b) is a partial cross section explanatory drawing which shows the reservoir | reserver for master cylinders, and a master cylinder. (A) (b) is an operation explanatory view. (A) (b) is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reservoir main body 1a Upper main body 1b Lower main body 5a, 5b Hose joint part 6a, 6b Supply port 7a, 7b Opening part 8 Communication path 9 Hose retaining part 15 Brake fluid 15b Liquid surface A Room B Room BA Negative pressure booster D1 Outer diameter E Engine BH Bonnet hood FG Windshield H Hose C Car compartment MA Master cylinder O1 Center axis O2 Center axis PA Dash panel R Master cylinder reservoir S Space T Car body

Claims (2)

A master cylinder reservoir for supplying hydraulic fluid to a master cylinder attached to a dash panel that partitions a compartment and a space under the hood in front of the windshield,
The hydraulic fluid to be supplied to the master cylinder is stored, and is configured separately from the master cylinder, and is located in the space under the hood at the front position of the vehicle body of the windshield and the master cylinder and above the master cylinder. A reservoir body disposed in a position;
A supply port having a hose joint portion, which is provided on the vehicle body rear side of the reservoir body and to which a hydraulic fluid supply hose connected to the replenishment port of the master cylinder is coupled;
The supply port has a straight communication path in a side view and extends into the reservoir body, and an opening of the supply port opens at a central portion of the reservoir body in the longitudinal direction of the vehicle body. A master cylinder reservoir.   The hose joint portion of the supply port has a hose retaining portion whose end portion is widened, and has a central axis with an outer diameter so that the central axis of the communication path is closer to the horizontal than the connection angle of the hose. 2. The master cylinder reservoir according to claim 1, wherein the central axis of the communication path is inclined.

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