JPH1178853A - Hydraulic fluid reservoir for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fluid level detector from erroneous being activated by sudden start and braking, etc., of the vehicle although the hydraulic fluid is properly reserved. SOLUTION: A wall part 32 which regulates moving of the hydraulic fluid between a secondary side fluid chamber 24 of the front side of the vehicle and a primary side fluid chamber 25 of the rear side of the vehicle is provided in a float chamber 26 partitioned in this reservoir body. The wall part 32 forms an approximately L-shape composed of the first wall part 32a and the second wall part 32b, and regulates the hydraulic fluid of the quantity which does not let down the float until a reed switch activates in the time of sudden acceleration of the vehicle even when the level of the hydraulic fluid is near the minimum line. Thus, the erroneous activation of the reed switch is prevented under the condition that the hydraulic fluid is properly reserved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic fluid reservoir for a vehicle, and more particularly to a hydraulic fluid reservoir optimally used for an external operating device such as a brake master cylinder.

[0002]

2. Description of the Related Art As a prior art of this kind, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 3-243454. 4 and 5 show a conventional hydraulic fluid reservoir, which will be described below.

[0003] A conventional hydraulic fluid reservoir is generally designated by 1. A pair of partition walls 4a and 4b are formed in an inner space of the main body 2 having an opening 3 for injecting a hydraulic fluid at an upper portion, and thereby a connecting wall 10 is connected to a secondary hydraulic chamber of a master cylinder (not shown) through a connection hole 10. A secondary liquid chamber 5 to communicate with, a primary liquid chamber 6 to communicate with the primary hydraulic chamber of the master cylinder via the connection hole 11, and a float chamber 7 are defined. A cylindrical guide portion 8 is formed in the float chamber 7 and guides a vertical movement of a float (not shown) disposed inside the guide wall 8. The float is configured in a known manner, and when a permanent magnet integrally provided with the float is lowered to a predetermined position, a reed switch as a liquid level detector (not shown) housed in a switch housing portion 14 at the bottom of the main body 2. Activates to warn of insufficient liquid level.

[0004]

In the conventional hydraulic fluid reservoir 1, a partition 9 is formed in a float chamber 7 thereof.
Thus, the float chamber 7 is partitioned on the secondary liquid chamber 5 side and the primary liquid chamber 6 side, so that the minimum required liquid amount in each of the chambers 5 and 6 is ensured. However, when the fluid level of the hydraulic fluid is near the minimum line (minimum line) of the appropriate storage range, the hydraulic fluid is stored inside the main body 2 due to sudden acceleration, sudden braking, sudden turning, or the like. When the liquid level of the first liquid chamber 6 is temporarily inclined,
The hydraulic fluid moves over the partition wall 9 from the side or the primary side liquid chamber 6 to the secondary side liquid chamber 5 side, and the hydraulic fluid in the float chamber 7 also moves to the secondary side liquid chamber 5 side or the primary side liquid chamber 6 side It is possible to move to. At this time, when the hydraulic fluid in the float chamber 7 moves to the secondary liquid chamber 5 side or the primary liquid chamber 6 side, the float chamber 7
Since the amount of liquid in the inside is reduced, the float is lowered, and the reed switch is operated even though the operating fluid is in a state where the reed switch is not operated. That is, there is a problem that the reed switch malfunctions while the working fluid is properly stored.

The present invention has been made in view of the above-described problems, and prevents a reed switch from being erroneously operated due to sudden acceleration or sudden braking of a vehicle, even though hydraulic fluid is properly stored. An object of the present invention is to provide a hydraulic fluid reservoir for a vehicle that can perform the operation.

[0006]

An object of the present invention is to provide a main body having an opening for injecting a working fluid as a medium of an external working device and an internal space for storing the working fluid, and a pair of partitions in the internal space. A float chamber defined by walls, a first chamber formed on the vehicle front side of the float chamber, and a second chamber formed on the vehicle rear side of the float chamber; It has a float that moves up and down in accordance with the amount of hydraulic fluid and is equipped with a permanent magnet, and a guide part that extends upward from the bottom of the float chamber by a predetermined height to guide the float to the upper limit position of movement. A switch that is disposed on the bottom side of the float chamber and that is activated when the permanent magnet approaches a predetermined position; Liquid When it is above, in the vehicle hydraulic fluid reservoir in which the hydraulic fluid in the first chamber and the second chamber can communicate through the float chamber, the level of the hydraulic fluid is inclined due to acceleration and deceleration acting on the vehicle. This problem is also solved by a vehicle hydraulic fluid reservoir, wherein a wall for restricting movement of the hydraulic fluid between the first chamber and the second chamber is provided in the float chamber.

According to the present invention, even if the level of the hydraulic fluid is near the minimum line, and even if the level of the hydraulic fluid is inclined by acceleration / deceleration acting on the vehicle, the level of the hydraulic fluid between the first chamber and the second chamber is reduced. Since the wall for restricting the movement is provided in the float chamber, it is possible to suppress a decrease in the amount of the hydraulic fluid in the float chamber and prevent the float from lowering to the position where the reed switch is operated. The malfunction of the reed switch in a state where the liquid is properly stored in the main body can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The hydraulic fluid reservoir for a vehicle according to the present embodiment is indicated as a whole by 21 and is connected to two bosses 45 and 46 of a master cylinder. The interior space of the main body 22 formed by heat-welding the upper main body 22a and the lower main body 22b is defined by three chambers by a pair of partition walls 23a and 23b. That is, the secondary-side liquid chamber 2 communicating with the secondary hydraulic chamber of the master cylinder through the connection hole 34
4, a primary side liquid chamber 25 communicating with the primary hydraulic chamber of the master cylinder via the connection hole 35, and a float chamber 26 between the two chambers 24, 25. Here, the secondary side liquid chamber 24 and the primary side liquid chamber 25
Respectively correspond to the first chamber and the second chamber in the present invention, the secondary side liquid chamber 24 is on the vehicle front side, and the primary side liquid chamber 25 is on the vehicle rear side. The capacity of the secondary-side liquid chamber 24 that can store the hydraulic fluid is set smaller than that of the primary-side liquid chamber 25. further,
A pump-side liquid chamber 40 is formed behind the primary-side liquid chamber 25 (to the right in FIG. 1) as a third chamber described later.

The float chamber 26 is provided with a float 28 which can be moved up and down in the figure according to the amount of hydraulic fluid stored in the main body 22 and extends upward from the bottom of the main body 22 by a predetermined height. The inner peripheral wall surface of the substantially cylindrical guide portion 27 receives a guiding action. A permanent magnet 29 is provided at the bottom of the float 28, and a reed switch 30 that is operated by approaching (falling) to a predetermined position is housed in a switch housing 31 formed at the bottom of the main body 22. . Reed switch 30
When is operated, it is configured to warn that the amount of hydraulic fluid is insufficient.

An opening 37 for injecting a working fluid is formed in the upper body 22a, and a disc-shaped sealing member 39 is formed in the opening 37.
The cap 38 is attached via. A cylindrical support portion 36 is integrally formed below the opening 37, and supports the filter member 33 at the bottom.

FIG. 2 is a top view of the lower body 22b. As shown, a substantially L-shaped wall 32 according to the present invention is formed in the float chamber 26. The wall portion 32 is formed from a bottom surface of the main body 22a with a mating surface M of the upper main body 22a and the lower main body 22b.
(See FIG. 1), a first wall portion 32a extending in the float chamber 26 by a predetermined distance in the left-right direction (vertical direction in FIG. 2), and an end portion of the first wall portion 32 And a second wall 32b extending at a predetermined distance in a direction perpendicular to the secondary liquid chamber 24 side. Further, the partition wall 47 is for ensuring the minimum required liquid amount of each of the chambers 24 and 25, and corresponds to the partition wall 9 of the conventional hydraulic fluid reservoir 1 described with reference to FIGS. Therefore, when the liquid level of the hydraulic fluid is below the wall portion 32 and above the partition wall 47, the secondary side liquid chamber 24
The liquid movement between the liquid chamber 25 side and the primary liquid chamber 25 side
Is possible only through the upper part.

Accordingly, when the liquid level of the hydraulic fluid stored in the main body 22 is located near the minimum line L but the permanent magnet 29 of the float 28 is located above the predetermined position for operating the reed switch 30, the vehicle When the hydraulic fluid level is tilted due to acceleration and deceleration acting on the
The movement of the hydraulic fluid between the secondary-side liquid chamber 24 and the primary-side liquid chamber 25 is restricted by the wall portion 32, and at the same time, the hydraulic fluid is allowed to move only through the region where the partition wall 47 is formed. Will be done. Therefore, the movement amount of the working fluid is greatly limited as compared with the conventional case, and it is possible to prevent the amount of the working fluid in the float chamber 26 from being greatly reduced.

Therefore, in the present embodiment, the amount of the working fluid regulated when the level of the working fluid is inclined is set to the value of the permanent magnet 2.
9 so as not to be lowered to the predetermined position.
, The malfunction of the reed switch 30 during acceleration and deceleration of the vehicle in the state described above can be reliably prevented. In particular, the inclination of the liquid surface during acceleration of the vehicle is generally larger than that during deceleration. However, the operation from the secondary liquid chamber 24 to the primary liquid chamber 25 is performed by the second wall 32a of the wall 32. The movement of the liquid can be regulated efficiently, and therefore, even if the storage capacity of the hydraulic fluid in the secondary fluid chamber 24 is made smaller than that in the primary fluid chamber 25 as in the hydraulic fluid reservoir 21 in the present embodiment. In addition, it is possible to prevent air from entering the secondary hydraulic chamber of the master cylinder.

Next, a description will be given of the pump-side liquid chamber 40 as a third chamber formed inside the main body 22 behind the primary-side liquid chamber 25, that is, on the right side in FIG. 1 or FIG.

Referring to FIG. 3, pump-side liquid chamber 40 includes:
A supply port 43 for supplying hydraulic fluid to a pump device (not shown) as an external operating device separate from the master cylinder; And a return port 42 for returning the hydraulic fluid to the control port. A filter portion 41 that covers an opening of the return port 42 on the liquid chamber 40 side is engaged with a step portion 51 formed near the return port 42, so that even if foreign matter is present in the system piping, the filter portion 41 The mesh portion prevents the foreign matter from entering the pump-side liquid chamber 40. Therefore, in the present embodiment, a pair of claw portions 52a and 52b formed on the step portion 51 and a pair of protrusion portions 53a and 53b protruding upward to a position higher than the claw portions 52a and 52b are formed. Plate 54 that fits into the gap
The positioning of the filter unit 41 is performed (see FIG. 2).
This prevents the filter section 41 from falling off. Further, in the present embodiment, by forming this plate 54 as a heat shielding plate made of a heat insulating material, the filter portion 41 is formed.
The heat transmission between the upper body 22a and the lower body 22b through the other members generated when the upper body 22a and the lower body 22b are thermally welded to the mesh portion is prevented, and the mesh portion is protected.

According to the hydraulic fluid reservoir 21 for a vehicle according to the present embodiment configured as described above, the float chamber 26 between the secondary liquid chamber 24 and the primary liquid chamber 25 is provided.
Wall 3 that regulates the movement of hydraulic fluid between the two chambers 24 and 25
2, the liquid movement to the secondary-side liquid chamber 24 or the primary-side liquid chamber 25 can be effectively restricted even when the liquid level of the hydraulic fluid is inclined during acceleration or deceleration of the vehicle,
Therefore, even when the liquid level of the hydraulic fluid is located near the minimum line, the liquid level in the float chamber 26 is prevented from lowering due to the movement of the hydraulic fluid when the liquid level is tilted, and the reed switch 30 is prevented from operating. can do. That is, malfunction of the reed switch 30 in a state where the liquid amount is appropriate inside the main body 22 can be prevented.

Further, according to the present embodiment, since the pump-side liquid chamber 40 is integrally provided behind the primary-side liquid chamber 25, it is not necessary to separately provide a dedicated reservoir. Therefore, only by injecting the hydraulic fluid from the opening 37, the hydraulic fluid can be injected into the pump-side liquid chamber 40, and the limited installation space of the vehicle can be effectively utilized.

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 embodiment, the second wall 32b of the wall 32 provided in the float chamber 26 is replaced with the first wall 32.
The entire wall 32 is formed in an L-shape in the front-rear direction toward the secondary liquid chamber 24 from the end of the second wall 3.
2b may be formed on the opposite side with respect to the guide portion 27 so as to have a U-shape as a whole. In addition, if the second wall portion 32 is extended to the primary liquid chamber 25 side to form a T-shape as a whole, liquid movement from the primary liquid chamber 25 to the secondary liquid chamber 24 during deceleration of the vehicle is also effectively performed. Can be regulated. Similarly, the first wall portion 32a and the second wall portion 32b may be orthogonal to each other to form a cross shape as a whole.

In the above-described embodiment, the third chamber is described as the pump-side liquid chamber 40 for the pump device in the operation control system of the vehicle. However, instead of this, the third chamber for the hydraulic brake booster is used. It may be a reservoir.

Further, in the above embodiment, the float 2
Although the guide portion 27 for guiding the up and down movement of 8 has a substantially cylindrical shape, the guide portion of the float 28 may be formed by engaging the guide portion with the float 28 in a rod shape.

[0023]

As described above, according to the vehicle hydraulic fluid reservoir of the present invention, the hydraulic fluid level is near the minimum line, and the hydraulic fluid level is inclined by acceleration / deceleration acting on the vehicle. However, since the float chamber is provided with a wall for restricting the movement of the hydraulic fluid between the first chamber and the second chamber, a reduction in the amount of the hydraulic fluid in the float chamber due to the liquid movement is suppressed, and the float is reduced. It is possible to prevent the reed switch from being lowered to the position where the reed switch operates, and thus, it is possible to prevent the reed switch from malfunctioning in a state where the working fluid is properly stored in the main body.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a vehicle hydraulic fluid reservoir according to an embodiment of the present invention.

FIG. 2 is a plan view of a lower main body according to the present invention.

FIG. 3 is a sectional view taken along line [3]-[3] in FIG.

FIG. 4 is a side sectional view showing a conventional hydraulic fluid reservoir.

FIG. 5 is a sectional view taken along line [5]-[5] in FIG.

[Explanation of symbols]

 Reference Signs List 21 hydraulic fluid reservoir 22 main body 22a upper main body 22b lower main body 23a partition wall 23b partition wall 24 secondary-side liquid chamber (first chamber) 25 primary-side liquid chamber (second chamber) 26 float chamber 27 guide section 28 float 29 permanent magnet 30 Reed switch 32 Partition wall 32a First wall portion 32b Second wall portion 37 Opening 40 Pump side liquid chamber (third chamber) 41 Filter section 42 Return port 43 Supply port 51 Step 52a Claw 52b Claw 53a Projection 53b Projection Part 54 plate

Claims (8)

[Claims] 1. A main body having an opening for injecting a working fluid serving as a medium of an external working device and an internal space for storing the working fluid, a float chamber defined in the internal space by a pair of partition walls, A first chamber formed on the vehicle front side of the float chamber; and a second chamber formed on the vehicle rear side of the float chamber, wherein the float chamber is vertically moved according to the amount of the hydraulic fluid. A float that moves in the direction and is equipped with a permanent magnet, and a guide portion that extends a predetermined height upward from the bottom of the float chamber to guide the float to the upper limit position of the movement,
A switch is disposed on the bottom side of the float chamber and operated when the permanent magnet approaches a predetermined position. When it is above the surface, the hydraulic fluid in the first chamber and the second chamber can communicate with each other through the float chamber in the vehicle hydraulic fluid reservoir. A hydraulic fluid reservoir for a vehicle, wherein a wall for restricting movement of the hydraulic fluid between the first chamber and the second chamber even when inclined is provided in the float chamber. 2. When the fluid level of the hydraulic fluid is above the predetermined position of the float and the fluid level of the hydraulic fluid is inclined due to acceleration and deceleration of the vehicle, the first portion is formed by the wall portion.
The hydraulic fluid reservoir according to claim 1, wherein the amount of the fluid restricted from moving the hydraulic fluid between the chamber and the second chamber is an amount that does not cause the permanent magnet to drop to the predetermined position. 3. The wall section restricts movement of the hydraulic fluid in the first chamber to the second chamber side due to acceleration of the vehicle, and the wall section moves left and right by a predetermined distance in the float chamber. A first wall extending in the direction, and a second wall orthogonal to the first wall and extending a predetermined distance toward the first chamber. Both walls are substantially the same as the guide. The hydraulic fluid reservoir for a vehicle according to claim 1 or 2, wherein the hydraulic fluid reservoir extends to the same height. 4. The apparatus according to claim 1, wherein the external operation device includes a plurality of external operation devices.
The chamber communicates with a secondary hydraulic chamber of a master cylinder, which is one of the external operating devices, and the second chamber communicates with a primary hydraulic chamber of the master cylinder,
The hydraulic fluid reservoir for a vehicle according to any one of claims 1 to 3, wherein a capacity of the first chamber for storing the hydraulic fluid is set smaller than that of the second chamber. 5. The main body is formed by heat-welding an upper main body and a lower main body, and the wall extends to a mating surface of the upper main body and the lower main body, and The vehicle operation according to any one of claims 1 to 4, wherein a third chamber that can communicate with an external operation device different from the master cylinder is formed at a rear side of the chamber side. Fluid reservoir. 6. A supply port for supplying the working fluid to the external working device and a return port for the working fluid from the external working device located above the supply port are formed in the third chamber. The hydraulic fluid reservoir for a vehicle according to claim 5, wherein: 7. A filter that covers an opening of the return port on the inner space side and engages with a step formed near the return port, a claw formed on the step, and a claw formed from the filter. 7. The vehicle operation according to claim 6, further comprising: a gap formed between the protrusion protruding to a high position, and a plate that fits into the gap and positions the filter. Fluid reservoir. 8. The heat shield plate according to claim 7, wherein said plate is a heat shielding plate for preventing heat propagation during heat welding of said upper body and said lower body to a mesh portion of said filter portion. Hydraulic fluid reservoir for vehicles.