JPH1029528A - Liquid reservoir device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the level in a reservoir main body from being detected incorrectly by vibration, inclination, etc., of a vehicle body. SOLUTION: A float guide 11 is provided in a reservoir main body storing operating liquid and a float 14 is stored movably in the vertical direction in the float guide 11. In the reservoir main body 1, a guide wall part 12 is provided in the outer circumferential side of the float guide 11 and a supply path 13 is formed in the reservoir main body 1 by the guide wall part 12. The supply path 13 communicates with the inside of the float guide 11. When the level L1 in the reservoir main body 1 is inclined, the operating liquid in the supply path 13 flows in the float guide 11 so as to hold the level L2 in the float guide 11 at the high position and prevent the level in the reservoir main body 1 from being detected incorrectly by the float 14, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid reservoir device suitably used for supplying a hydraulic fluid to, for example, a master cylinder for a brake, a master cylinder for a clutch, etc. of an automobile, and more particularly to a liquid reservoir device provided with a liquid level detector. The present invention relates to a liquid reservoir device.

[0002]

2. Description of the Related Art Generally, a reservoir body in which a hydraulic fluid is stored, a cylindrical float guide protruding upward from a bottom portion of the reservoir body, and provided in the reservoir body, A liquid reservoir device that includes a float for detecting a liquid level that is housed movably in a direction and floats while being guided by the float guide is used for a brake system of an automobile or the like.

[0003] In this type of conventional liquid reservoir device, a reservoir body containing hydraulic fluid (brake fluid) is connected to a master cylinder for braking, and the hydraulic fluid in this reservoir main body is supplied to the master cylinder in response to a brake operation or the like. By supplying the fluid to the cylinder side, the hydraulic fluid is supplied and discharged from the master cylinder to each brake cylinder and the like of the vehicle.

[0004] A liquid level detector is disposed on the bottom side of the float accommodated in the float guide.
The float floats up and down following the liquid level in the float guide together with the liquid level detector, whereby the liquid level detector detects the liquid level in the reservoir body.

On the other hand, the float guide is formed with a cut-out liquid passage for communicating the inside and the outside thereof, and the working fluid in the reservoir body flows into and out of the float guide through the liquid passage. Thereby, the liquid level in the float guide and the liquid level in the reservoir body are made equal, and the float follows the liquid level in the reservoir body and floats.

[0006] The liquid level detector informs that when the liquid level in the reservoir body decreases and the float drops to a specified height, the remaining amount of the working fluid in the reservoir body decreases. For example, an alarm lamp or the like provided in a driver's cab of a vehicle is turned on.

Here, the specified height is set in advance based on a minimum required fluid level in the reservoir body for stably operating the brake (hereinafter referred to as a minimum fluid level). ing.

[0008]

By the way, in the above-mentioned prior art, when a large inertial force is generated in the vehicle due to sudden acceleration / deceleration during driving, or when the vehicle rolls largely due to unevenness of the road surface, etc. In response to this, the liquid level of the working fluid in the reservoir body is inclined, and the liquid level may be instantaneously reduced from the actual liquid level at the position of the float guide.

For this reason, in the prior art, even when the hydraulic fluid is sufficiently contained in the reservoir body, if the liquid level is tilted due to the action of the tilt or inertia of the vehicle, the float is set to the above-described specification. There is a problem that the vehicle may instantaneously descend to the height, which causes an alarm lamp or the like in the driver's cab to flash unnecessarily, giving a driver of the vehicle an uncomfortable feeling.

Therefore, the applicant of the present application sets a design standard to be satisfied by the liquid reservoir device so that the liquid level is not erroneously detected, and designs the liquid reservoir device based on the design standard, thereby providing the above-described alarm lamp. And so on to avoid malfunctions.

According to this design standard, when the minimum required hydraulic fluid remains in the reservoir body, that is, when the liquid level of the hydraulic fluid is equal to the aforementioned minimum liquid level, 35 ° which is the maximum tilt angle during normal operation
The condition is that the float does not drop down to the specified height and the warning lamp or the like does not light even when inclined at an inclination angle of about 45 °.

However, due to design restrictions on the shape, mounting position on the master cylinder side, etc. of the reservoir body, the float guide must be arranged offset from the center in the reservoir body to the vicinity of the side wall. In this position, when the liquid level is tilted at this position, the liquid level is greatly reduced as compared with the central part in the reservoir body, so that the float easily descends to the specified height, and the reservoir body is designed as described above. There is an unsolved problem of not meeting the standards.

The present invention has been made in view of the above-mentioned problems of the prior art. In the present invention, when the liquid level in the reservoir main body is inclined, the liquid level in the reservoir main body is erroneously detected by a float or the like. It is an object of the present invention to provide a liquid reservoir device capable of accurately detecting the liquid level in the reservoir main body even when the float guide is arranged offset from the central part in the reservoir main body. .

[0014]

According to a first aspect of the present invention, there is provided a reservoir body in which a working fluid is contained, and a reservoir body protruding upward from a bottom surface of the reservoir body. A cylindrical float guide provided in the reservoir body for guiding a float for liquid level detection in a vertical direction, and provided in the reservoir body so as to extend radially outward from the float guide; And a guide wall for allowing the hydraulic fluid to flow into and out of the float guide.

According to the above configuration, even when the position of the float guide is offset from the central portion of the reservoir body by a predetermined dimension, the guide wall portion is extended in the same direction as the offset direction, so that the operation inside the reservoir body is performed. The liquid flows into the float guide while guiding the liquid along the guide wall.
Can be put out. Even when the liquid level in the reservoir body is greatly inclined due to, for example, vibration of the vehicle, the hydraulic fluid in the reservoir body can be guided into the float guide by the guide wall, and the liquid level in the float guide can be increased. Can be maintained at a higher liquid level than in the reservoir body.

According to a second aspect of the present invention, there is provided a reservoir body in which a working fluid is contained, and the reservoir body is provided on the reservoir body so as to protrude upward from a bottom surface of the reservoir body.
A cylindrical float guide for guiding a float for detecting a liquid surface in a vertical direction; and a fixed height provided on the reservoir body so as to extend radially outward from the float guide. A guide wall for allowing a liquid to flow into and out of the float guide, and a height smaller than the guide wall, the guide wall being provided on the distal end side of the guide wall and spaced from the float guide. A configuration is adopted which comprises a partition part that divides the interior of the reservoir body into an inner chamber and an outer chamber on the float guide side with dimensions.

In this case as well, the hydraulic fluid in the reservoir main body can be guided into the float guide by the guide wall, and the reservoir main body is provided at the tip end side of the guide wall. Since the partition is provided to partition the inside into the inner chamber and the outer chamber on the float guide side, for example, in a state where the remaining amount of the hydraulic fluid is relatively small, even when the liquid level in the reservoir body is greatly inclined, The hydraulic fluid can be secured in the inner chamber on the float guide side by the guide wall portion and the partition portion, and the liquid level in the float guide can be maintained at a higher liquid level than in the reservoir body.

According to a third aspect of the present invention, there is provided a reservoir body in which a working fluid is contained, and the reservoir body is provided in the reservoir body so as to protrude upward from a bottom portion of the reservoir body.
A cylindrical float guide for guiding a float for detecting a liquid surface in a vertical direction, and provided in the reservoir main body so as to extend radially outward from the float guide, and the hydraulic guide in the reservoir main body is provided with the float guide. A guide wall portion that flows into and out of the float guide; a liquid storage chamber that is formed in the reservoir body by the guide wall portion and stores a working fluid for replenishing the inside of the float guide; A throttle section is provided on the tip side of the guide wall section and provides a throttle resistance when the hydraulic fluid flows into and out of the liquid storage chamber.

With this, the hydraulic fluid in the reservoir main body can be stored in the liquid storage chamber in order to replenish the hydraulic fluid in the reservoir main body into the float guide. However, the working fluid in the storage chamber can be supplied into the float guide, and the liquid level in the float guide can be maintained at a higher level than in the reservoir body. Also, even in the case where the liquid level in the reservoir body is sharply inclined, the hydraulic fluid in the float guide is stored by giving the throttle resistance to the hydraulic fluid that is going to flow out of the storage chamber at the throttle section. Outflow from the chamber to the outside can be suppressed by the restricting portion, and the inside of the float guide can be maintained at a relatively high liquid level.

[0020]

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

FIGS. 1 and 2 show a first embodiment according to the present invention. In this embodiment, a liquid reservoir device for a master cylinder used in a brake system of an automobile or the like is taken as an example of a liquid reservoir device. A description is given below.

In the drawing, reference numeral 1 denotes a reservoir body for containing a hydraulic fluid such as a brake fluid therein. The reservoir body 1 is formed as a bottle-like container made of, for example, a resin material and includes a master cylinder (not shown). Are provided separately.

The reservoir body 1 comprises an upper case 2 and a lower case 3, and an upper surface 4 provided on the upper case 2, which is opposed to the upper surface 4 in a vertical direction, and provided on the lower case 3. Left and right extending upward and downward between the upper case 2 and the lower case 3 so as to integrally connect the bottom surface portion 5 and the upper surface portion 4 and the bottom surface portion 5 on the outer peripheral side. Side wall 6
A, 6B and front and rear side walls 6C, 6C.

A step 5A is integrally formed on the bottom 5 at the left side in FIGS. 1 and 2. On the outer surface (lower surface) of the bottom 5, a mounting portion 5B for mounting a liquid level sensor 16 described later is provided. Are integrally formed. Further, as shown in FIG. 1, mounting brackets 7, 7,... For mounting the reservoir body 1 on the vehicle body side are integrally formed on the outer surface side of the upper surface portion 4 and the side walls 6A, 6B.

Numeral 8 denotes a liquid supply port for supplying a working fluid to the inside of the reservoir main body 1, and the liquid supply port 8 is provided on the upper surface 4 of the reservoir main body 1.
And is always closed by a cap 9. In addition, the cap 9 is provided with a ventilation path 9 </ b> A that allows the inside and outside of the reservoir body 1 to communicate with each other via the liquid supply port 8.

Reference numerals 10A and 10B denote fluid passages through which the hydraulic fluid in the reservoir body 1 flows into and out of the master cylinder.
The liquid passages 10A and 10B are formed in a step 5A of the reservoir body 1.
And connected to respective brake systems (not shown) of, for example, a two-system brake installed in the vehicle, and replenishes these brake systems with the hydraulic fluid in the reservoir body 1.

Reference numeral 11 denotes a cylindrical float guide provided in the reservoir main body 1. The float guide 11 is offset (separated) from the center of the reservoir main body 1 toward the side wall 6A. Are set up from the bottom surface 5 toward the upper surface 4. In addition, as shown in FIG.
Narrow slit 11 which is located on the side wall 6A side (offset direction side of the float guide 11) and extends vertically.
A is formed.

The inside and outside of the float guide 11 are communicated with each other through a slit 11A and a supply passage 13 described later, and the working fluid in the reservoir body 1 flows into and out of the float guide 11 through these. Accordingly, the liquid level in the float guide 11 and the liquid level in the reservoir body 1 are made equal at the normal time when the liquid level is not inclined. The float guide 11 guides the float 14 in the vertical direction, and detects the liquid level in the reservoir body 1 by the float 14.

Numerals 12 and 12 denote guide walls integrally formed on the bottom 5 of the reservoir body 1 according to the present embodiment. Each of the guide walls 12 is separated from the bottom 5 of the reservoir 1 as shown in FIG. It protrudes upward with a certain height H toward the upper surface portion 4. Also, each guide wall 12 is shown in FIG.
As shown in FIG. 3, the float is formed toward the side wall 6A of the reservoir body 1 such that the base end is integrally formed on the outer peripheral side of the float guide 11 on both sides of the slit 11A and the distal end 12A extends from the float guide 11 in the radial direction. The guides 11 extend in the offset direction and face each other with a small interval of the width dimension W1.

Reference numeral 13 denotes a supply passage formed between the guide wall portions 12. The supply passage 13 is formed as a passage having a width W1 extending in the offset direction of the float guide 11, and is provided through the slit 11A. Communicates within. The supply passage 13 guides the hydraulic fluid in the reservoir body 1 into the float guide 11 and gives a throttle resistance to the hydraulic fluid flowing into and out of the float guide 11, so that the liquid level in the float guide 11 is sharply increased. It is designed to suppress fluctuations.

When the liquid level L1 in the reservoir body 1 is inclined as shown by a two-dot chain line in FIG. The liquid is supplied into the float guide 11 and the liquid level L2 (indicated by a dashed line in FIG. 1) in the float guide 11 is supplied to the reservoir body 1.
The liquid level L1 can be maintained at a level higher than the liquid level L1.

Reference numeral 14 denotes a float for detecting the liquid level inserted into the float guide 11, and the float 14 is formed in a substantially cylindrical shape from a material such as a synthetic resin, and a magnet 15 is attached to a lower end surface thereof. I have. And float 1
4 is a reservoir body 1 guided by a float guide 11
Floats up and down following the liquid level inside.

Reference numeral 16 denotes a liquid level sensor which constitutes a liquid level detecting means together with the magnet 15. The liquid level sensor 16 is composed of, for example, a reed switch or the like, and is located on the bottom side of the float guide 11 and has a mounting portion 5B Mounted on Then, the liquid level sensor 16 is normally opened, and when the magnet 15 approaches the float 14 together with the float 14, the liquid level sensor 16 detects this and enters the closed state.

Reference numeral 17 denotes a partition wall disposed between the liquid passages 10A and 10B. The partition wall 17 is provided integrally with the front and rear side walls 6C at both ends as shown in FIG. A liquid chamber on the side of the liquid passage 10A and a liquid chamber on the side of the liquid passage 10B are defined. Then, even when the liquid level in the reservoir main body 1 is greatly inclined, the partition wall 17 can ensure the minimum required amount of the working fluid in each of these liquid chambers.

Reference numeral 18 denotes a plate-like stopper integrally formed with the upper case 2. The stopper 18 extends downward from the upper surface 4 of the reservoir body 1 toward the vicinity of the upper end side of the float guide 11, and is provided inside the reservoir body 1. When the liquid level of the float guide 11 becomes higher than that of the float guide 11, the float 14 is prevented from separating from the inside of the float guide 11.

The liquid reservoir device according to the present embodiment has the above-described configuration, and its operation will be described next.

First, when the working fluid is supplied into the reservoir body 1, the cap 9 is inserted through the liquid supply port 8 of the reservoir body 1.
Is removed and working fluid is injected into the reservoir body 1 from the liquid supply port 8. When a vehicle brake is operated, a brake pedal or the like is operated to supply hydraulic fluid in the reservoir body 1 to the master cylinder via the fluid passages 10A and 10B, and the brake fluid is supplied from the master cylinder to the brake cylinder. The hydraulic fluid is supplied and discharged to a cylinder (provided on each wheel side of the vehicle) and the like.

At this time, the hydraulic fluid in the reservoir body 1 flows into and out of the float guide 11 while being stored in the supply passage 13 between the guide walls 12, so that the working fluid in the reservoir body 1 is Liquid level and float guide 1
The liquid level is equal to the liquid level in 1 when there is no fluctuation in the liquid level, and when the remaining amount of the hydraulic liquid gradually decreases and the liquid level drops, the float 14 follows the liquid level of the hydraulic liquid. It descends in the float guide 11.

The liquid level in the reservoir body 1 is
When the float becomes lower than the minimum liquid level for stably operating the brake described in the prior art and the float 14 descends to a prescribed height at which the shortage of the hydraulic fluid is to be notified, the magnet 15 approaches the liquid level sensor 16. , The liquid level sensor 16
This switch detects this and turns on. As a result, for example, an alarm lamp or the like provided in the driver's cab of the vehicle is turned on to notify the driver or the like that the remaining amount of the working fluid is low.

On the other hand, when the liquid level L1 in the reservoir body 1 is inclined in a direction opposite to the offset direction of the float guide 11 as shown in FIG. Similarly, the fluid level L2 in the supply passage 13 and the float guide 11 is also inclined, so that the hydraulic fluid in the supply passage 13 is supplied toward the float guide 11.

As a result, the liquid level L in the float guide 11
2 is higher than the liquid level L1 in the reservoir body 1, the liquid level is maintained at a level higher than the minimum liquid level, and the float 14 is at a position higher than the specified height, and an alarm lamp or the like is provided. Float without lighting.

Further, even if the hydraulic fluid in the float guide 11 tries to flow out to the supply passage 13 side through the slit 11A instantaneously due to the liquid level fluctuation at this time, the supply passage 1
3 is formed with a small passage area (width W1) between the pair of guide walls 12 and 12 so that the hydraulic fluid in the supply passage 13 can be provided with throttling resistance, and the hydraulic fluid in the float guide 11 can be provided. Can be reliably prevented from flowing out of the supply passage 13.

Thus, in the present embodiment, a pair of guide wall portions 1 extending in the offset direction of the float guide 11 are provided.
2 and 12 are provided in the reservoir body 1, and the hydraulic fluid in the reservoir body 1 is caused to flow into and out of the float guide 11 through the respective guide walls 12, so that replenishment between the respective guide walls 12 is provided. The working fluid can be stored in the passage 13. Accordingly, even when the liquid level in the reservoir body 1 is inclined in a direction opposite to the offset direction of the float guide 11, the hydraulic fluid in the supply passage 13 can be supplied into the float guide 11,
The liquid level in the float guide 11 can be suppressed from abruptly changing, and the liquid level L2 in the float guide 11 can be reduced as shown in FIG.
Higher liquid level can be maintained.

Therefore, according to the present embodiment, despite the fact that the required amount of hydraulic fluid is contained in the reservoir body 1, the influence of the acceleration or deceleration of the vehicle, or the inclination of the vehicle due to the unevenness of the road surface, etc. It is possible to reliably prevent a shortage of the remaining amount of the working fluid from being erroneously notified, and it is possible to solve a problem such as giving an unpleasant feeling to a driver by blinking an alarm lamp.

Further, even when the float guide 11 is disposed so as to be offset from the central portion in the reservoir main body 1 toward the side wall 6A, the liquid level in the reservoir main body 1 can be accurately detected via the float 14, and the float can be detected. The arrangement position of the guide 11 can be freely selected in the reservoir body 1, and
The degree of freedom in designing can be increased.

In addition, the reservoir body 1 according to the present embodiment
Can be easily dealt with simply by adding each guide wall portion 12 to the conventional reservoir body.
The reservoir main body 1 can be easily formed only by forming a concave groove or the like for each guide wall portion 12 in a mold for molding the liquid, without making a major design change or the like with respect to the liquid reservoir device of the prior art. The liquid reservoir device can be easily manufactured.

Next, FIGS. 3 and 4 show a second embodiment according to the present invention.
In this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and description thereof will be omitted. However, the reservoir body 21 according to the present embodiment
Is characterized in that a partition portion 22 is provided between each guide wall portion 12 of the reservoir body 1 used in the first embodiment.

Here, the reservoir main body 21 has substantially the same configuration as the reservoir main body 1 according to the first embodiment. And the partition part 22 is a tip part 12A of each guide wall part 12.
Between the front end portions 12A and the guide wall portions 12 from the bottom surface portion 5 toward the upper surface portion 4.
Projecting upward with a height dimension h (h <H) smaller than the height dimension H.

The height h of the partition 22 is smaller than the above-described minimum liquid level, and the height h of the
When the liquid level in 1 is lower than the minimum liquid level, the liquid level in the float guide 11 can follow this. Then, the partitioning portion 22 divides the inside of the reservoir main body 21 into a supply passage 23 serving as an inner chamber on the float guide 11 side, and the supply passage 23 and the float guide 1.
1 and an outer chamber 24 in the reservoir main body 21 which is located outside.

Thus, in the present embodiment having such a configuration, substantially the same operation and effect as those of the first embodiment can be obtained. In the present embodiment, particularly, in the present embodiment, the distal end portion 12A of each guide wall portion 12 is formed. By providing the partition portion 22 on the side, the supply passage 23 between each guide wall portion 12 is formed on the bottom portion 5 side by the outer chamber 2.
4, the hydraulic fluid can be secured in the float guide 11 through the supply passage 23 and the partition 22 even when the remaining amount of the hydraulic fluid in the reservoir body 21 becomes relatively small. .

Therefore, even when the liquid level in the reservoir body 21 is inclined, for example, as indicated by a two-dot chain line in FIG.
The amount of hydraulic fluid supplied into the float guide 11 can be increased by the amount secured by the partition portion 22, and the liquid level L4 in the float guide 11 is indicated by a dashed line, as shown in FIG.
It can be held at a position higher than the liquid level L3.

Next, FIG. 5 shows a third embodiment according to the present invention. The feature of this embodiment is that a large-volume liquid storage chamber is formed in the reservoir body by the guide wall, and the guide wall has That is, a throttle passage for the liquid storage chamber is provided. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a reservoir main body according to the present embodiment. The reservoir main body 31 has substantially the same structure as the reservoir main body 1 according to the first embodiment. The portions 32 face each other with a larger gap than in the first embodiment.

Reference numerals 32, 32 denote guide walls provided on the reservoir body 31. Each of the guide walls 32 is formed integrally with the bottom surface 5 of the reservoir body 31 in the same manner as in the first embodiment. The portion 5 is erected upward from the portion 5 toward the upper surface portion 4.

However, in the present embodiment, each guide wall 32
Is the float guide 11 with the base end side sandwiching the slit 11A.
The distal end 32A extends in the offset direction of the float guide 11 described above toward the side wall 6A of the reservoir main body 31. The guide walls 32 substantially correspond to the outer diameter of the float guide 11, and are opposed to each other with a width W2 (W1 <W2) larger than the width W1 of the first embodiment. The 32A sides are bent in an L-shape toward each other, and a narrowed portion 34 described later is provided between the distal end portions 32A of the guide wall portions 32.

Reference numeral 33 denotes each guide wall 3 having a width W2.
2 shows a liquid storage chamber formed between the two, and the liquid storage chamber 33 has a certain volume larger than the supply passage 13 according to the first embodiment, and communicates with the inside of the float guide 11 through the slit 11A. ing. And the liquid storage chamber 33 is the reservoir body 3
1 is stored therein, and when the liquid level in the reservoir body 31 is inclined in a direction opposite to the offset direction of the float guide 11 described above, the hydraulic fluid is directed into the float guide 11. Replenish.

Reference numeral 34 denotes a throttle portion provided between the distal end portions 32A of the guide wall portions 32. The throttle portion 34 is formed by a slit having a width equal to or smaller than the width W1 described above. The inside and outside of the chamber 33 are communicated with each other, and at the same time, a throttle resistance is given to the hydraulic fluid flowing into and out of the liquid storage chamber 33 from the inside of the reservoir body 31.

Thus, in the present embodiment having the above-described configuration, substantially the same operation and effect as those of the first embodiment can be obtained. Can be stored in the large liquid storage chamber 33, so that even when the remaining amount of the hydraulic fluid in the reservoir body 31 is relatively small, the hydraulic fluid for replenishing the inside of the float guide 11 is stored in the liquid storage chamber 33. Can be secured. In this state, even when the liquid level in the reservoir main body 31 is inclined, the working fluid can be reliably supplied from the liquid storage chamber 33 into the float guide 11, and the liquid level in the float guide 11 can be changed in the reservoir main body 31. Can be maintained at a liquid level higher than the liquid level.

Further, the restricting portion 34 can provide a throttling resistance to the hydraulic fluid flowing into and out of the reservoir chamber 33 and the inside of the reservoir main body 31, so that the liquid level in the reservoir main body 31 is sharply increased. Even if it fluctuates, float guide 1
The liquid level within 1 can be changed relatively slowly. That is, even when the liquid level in the reservoir main body 31 is sharply inclined, the restricting portion 34 gives the throttling resistance to the hydraulic fluid which is about to flow out of the liquid storage chamber 33, thereby allowing the hydraulic fluid in the float guide 11 to operate. The outflow of the liquid from the liquid storage chamber 33 to the outside can be reliably suppressed by the throttle portion 34, and the liquid level in the float guide 11 can be prevented from being transiently greatly reduced.

Next, FIG. 6 shows a fourth embodiment according to the present invention. In this embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and description thereof will be omitted. And However, the feature of the reservoir body 41 according to the present embodiment is that the partitioning section 42 similar to that of the second embodiment is provided between the guide walls 32 of the reservoir body 31 used in the third embodiment at the position of the throttle section 34. Is formed, and the inside of the reservoir main body 41 is partitioned into the liquid storage chamber 43 and the outer chamber 44 by the partition section 42.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the second and third embodiments can be obtained.

In each of the above embodiments, a pair of guide wall portions 1 extending radially outward from the float guide 11 are provided.
2, 12 (32, 32) are connected to the reservoir body 1 (21, 3).
However, the present invention is not limited to this. For example, one guide wall may be provided in the reservoir body, and the hydraulic fluid may be interposed between the side wall of the reservoir body and the guide wall. May be formed.

Further, in each of the above embodiments, the liquid reservoir device for the master cylinder of the brake has been described as an example. However, the present invention is not limited to this, and is applicable to various master cylinders having a liquid level alarm device. It can be applied to a liquid reservoir device and the like.

[0064]

As described above in detail, according to the first aspect of the present invention, the guide wall is provided on the reservoir body, and the hydraulic fluid in the reservoir body flows into the float guide via the guide wall. The hydraulic fluid in the reservoir body flows into and out of the float guide along the guide wall portion even when the liquid level in the reservoir body is greatly inclined. The liquid can be reliably supplied to the float guide along the portion, and the liquid level in the float guide can be maintained at a liquid level higher than the liquid level in the reservoir body. Also, when the hydraulic fluid is about to flow out of the float guide, a restricting resistance can be given by the guide wall portion, and it is possible to reliably suppress a rapid change in the liquid level in the float guide.
Accordingly, it is possible to reliably prevent the liquid level in the reservoir main body from being erroneously detected due to the inclination of the vehicle, the action of the inertial force, or the like. In addition, even when the float guide is disposed offset from the central portion in the reservoir body, the liquid level in the reservoir body can be accurately detected, and the position of the float guide can be freely selected in the reservoir body. ,
The degree of freedom in the design can be increased.

On the other hand, according to the second aspect of the present invention, the interior of the reservoir body is divided into an inner chamber and an outer chamber on the float guide side by providing a partition on the tip end side of the guide wall. Therefore, even when the liquid level in the reservoir body is inclined in a state where the remaining amount of the hydraulic fluid is relatively small, it is possible to reliably maintain the liquid level in the float guide at a liquid level higher than the liquid level in the reservoir body. it can.

According to the third aspect of the present invention, the liquid storage chamber communicating with the inside of the float guide is formed by the guide wall portion, and the throttle portion is provided on the tip end side of the guide wall portion. Therefore, even when the remaining amount of the hydraulic fluid in the reservoir main body becomes relatively small, the hydraulic fluid for replenishing the inside of the float guide can be secured in the large volume storage chamber, and in this state, the liquid level in the reservoir main body can be secured. Even if is inclined, the working fluid can be reliably supplied from the liquid storage chamber into the float guide, and the liquid level in the float guide can be reliably maintained at a liquid level higher than the liquid level in the reservoir body. . In addition, the liquid level in the float guide can be changed relatively gently with respect to the liquid level in the reservoir body by the throttle section, and even when the liquid level in the reservoir body is sharply inclined, the float can be floated. It is possible to reliably prevent the hydraulic fluid in the guide from flowing out of the liquid storage chamber to the outside by the throttle portion, and to prevent the liquid level in the float guide from being greatly reduced transiently.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a liquid reservoir device according to a first embodiment, taken along line II in FIG.

FIG. 2 is a cross-sectional view as seen from the direction of arrows II-II in FIG.

FIG. 3 is a longitudinal sectional view similar to FIG. 1, showing a liquid reservoir device according to a second embodiment.

FIG. 4 is a cross-sectional view as viewed from a direction indicated by arrows IV-IV in FIG. 3;

FIG. 5 is a sectional view similar to FIG. 4, showing a liquid reservoir device according to a third embodiment.

FIG. 6 is a sectional view similar to FIG. 4, showing a liquid reservoir device according to a fourth embodiment.

[Explanation of symbols]

 1, 21, 31, 41 Reservoir body 5 Bottom part 6A Side wall 11 Float guide 12, 32 Guide wall part 13 Supply passage 14 Float 22, 42 Partition part 23 Supply passage (inner chamber) 24, 44 Outer chamber 33 Liquid storage chamber 34 Restrictor 43 Liquid storage chamber (inner chamber) H, h Height dimensions L1, L2, L3, L4 Liquid level

Claims (3)

[Claims] 1. A reservoir body in which a hydraulic fluid is contained, and a cylindrical body provided in the reservoir body protruding upward from a bottom portion of the reservoir body and guiding a float for detecting a liquid level in a vertical direction. It comprises a float guide and a guide wall portion provided in the reservoir body so as to extend radially outward from the float guide, and allowing a hydraulic fluid in the reservoir body to flow into and out of the float guide. Liquid reservoir device. 2. A reservoir main body in which a hydraulic fluid is stored, and a cylindrical member provided in the reservoir main body and protruding upward from a bottom portion of the reservoir main body to guide a float for detecting a liquid surface in a vertical direction. A float guide, a guide wall portion provided on the reservoir body at a constant height so as to extend radially outward from the float guide, and allowing a hydraulic fluid in the reservoir body to flow into and out of the float guide. An inner chamber on the float guide side, which is provided on the reservoir body at a tip end side of the guide wall portion separated from the float guide and has a smaller height dimension than the guide wall portion inside the reservoir body. A liquid reservoir device comprising: an outer chamber; 3. A reservoir body in which a hydraulic fluid is contained, and a cylindrical body which is provided in the reservoir body and protrudes upward from a bottom portion of the reservoir body and guides a float for detecting a liquid surface in a vertical direction. A float guide, a guide wall portion provided in the reservoir body so as to extend radially outward from the float guide, and allowing a working fluid in the reservoir body to flow into and out of the float guide; and the guide wall portion. A liquid storage chamber formed in the reservoir main body for storing a hydraulic fluid for replenishing the inside of the float guide, and provided at a tip end side of a guide wall portion away from the float guide, wherein the hydraulic fluid is provided. A liquid reservoir device comprising: a throttle section that provides a throttle resistance when flowing into and out of the liquid storage chamber.