JPH082011Y2 - Reservoir tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a reservoir tank provided in a vehicle master cylinder.

"Prior Art" A master tank of a vehicle brake is equipped with a reservoir tank for storing brake fluid. This reservoir tank is constructed as shown in FIGS. 6 to 8 as an example. That is, partition walls 2 and 3 are provided on the bottom portion 1a of the reservoir body 1 so as to be separated from each other and parallel to each other. Notches 4 and 5 are formed in the partition walls 2 and 3, respectively.

A cylindrical float guide 6 located between the partition walls 2 and 3 is provided on the bottom portion 1a of the reservoir body 1. The float guide 6 has protrusions 6a, 6 protruding inward in the radial direction.
a is provided. Reference numerals 1d and 1e denote attachment parts to the master cylinder, which have passages that connect the inside of the master cylinder and the inside of the reservoir body 1.

On the other hand, a cylindrical opening 1c having a flange 1b is formed in the upper portion of the reservoir body 1.

On the upper part of the reservoir body 1, partition walls 7 and 8 are provided in a pendant shape so as to face the partition walls 2 and 3 in the same manner as the partition walls 2 and 3. Partition 2
Gaps are provided between the partition wall 7 and the partition wall 7, and between the partition wall 3 and the partition wall 8.

Further, a cylindrical filter assembly accommodating portion (cylindrical portion) 9 having a bottom portion 9a located between the partition walls 7 and 8 is provided on the upper part of the reservoir body 1, and a partition wall is provided at the bottom portion 9a of the filter assembly accommodating portion 9.
A cylindrical float guide 10 provided between 7 and 8 is provided in a pendant shape. The float guide 10 is provided with projections 10a, 10a protruding inward in the radial direction. A gap is provided between the float guides 6 and 10.

On the inner peripheral surface of the side wall of the filter assembly accommodating portion 9, a plurality of ribs 9b protruding inwardly and extending in the vertical direction and a plurality of slits 9c penetrating the side wall of the filter assembly accommodating portion 9 are alternately arranged in the circumferential direction. It is provided in.

A filter assembly 11 is housed in the filter assembly housing portion 9. In the filter assembly 11, a flange 11c is formed on the top of a cylindrical side wall 11b having a bottom 11a, and the bottom 11
A filter 12 having a mesh is provided in two half-moon shaped holes formed in a and a plurality of holes formed in the side wall 11b, and is a cup-shaped as a whole.

The filter assembly 11 is accommodated in the filter assembly accommodating portion 9 by the bottom portion 11a being placed on the bottom portion 9a of the filter assembly accommodating portion 9 and seated.

A float chamber 13 is formed in each of the float guides 6 and 10, and the float chamber 13 is filled with a liquid. A float 14 is provided in the float chamber 13 so as to be vertically movable by being guided by float guides 6 and 10. The float 14 is provided with a magnet so that the float 14 descends and the reservoir body 1
When approaching the reed switch 15 provided on the bottom 1a of the reed switch 15, the reed switch 15 is turned on, and a liquid level alarm device (not shown) connected to the reed switch 15 gives an alarm.

In the float guides 6 and 10, since the reservoir tank is used in the vehicle, the liquid level fluctuation of the hydraulic fluid in the reservoir tank due to the vehicle deceleration or shaking during braking of the vehicle acts on the float provided in the reservoir tank ( The effect of the fluctuation of the hydraulic fluid level on the float tends to become more severe above the float.)
In order to prevent the floating of the float as much as possible, in particular, the float guide 10 is formed in a cylindrical shape as described above and surrounds the float 14 all around.

A cap 16 for closing the opening 1c is attached to the opening 1c of the reservoir body 1. The cap 16 has
A recess 16b is formed in the center of the back surface of the top plate portion 16a, and a plurality of ventilation grooves (atmosphere communicating portions) 16d are formed from the inner surface of the top plate portion 16a to the inner surface of the skirt portion 16c.

Between the flange 1b of the opening 1c and the cap 16, an air chamber 18 is formed on one side and a reservoir chamber 19 is formed on the other side with the liquid surface of the working fluid in the reservoir body 1. A unique gasket 20 is provided. At the center of this gasket 20, there is a slit (atmosphere communicating part) 20.
a is provided in a penetrating state, and reservoir chamber 19 and atmosphere chamber 1
When the pressure with 8 is balanced, the slit 20a is kept closed to seal the reservoir chamber 19, while the liquid level of the working fluid in the reservoir body 1 fluctuates.
When the pressure fluctuates, the gasket 20 is bent by the pressure difference with the atmospheric chamber 18 to open the slit 20a, so that the reservoir chamber 19 can be communicated with the atmosphere and the internal pressure can be maintained at about atmospheric pressure. With such a valve function, the pressure in the reservoir chamber 19 is stabilized.

When the pressures in the atmosphere chamber 18 and the reservoir chamber 19 are balanced, the gasket 20 returns to its original neutral position due to its restoring force,
As described above, the slit 20a is designed to be hermetically sealed.

[Problems to be Solved by the Invention] In such a conventional reservoir tank, the filter assembly is downsized from the viewpoint of vehicle mountability and the like, and the filter assembly 11 is downsized so that the filter 12 The liquid attached to the mesh may form a film.

In addition, as described above, the fact that the guide wall of the float guide 10 is formed in a cylindrical shape and surrounds the float 14 all around, and that the liquid adhering to the mesh portion of the filter 12 forms a film is considered. As a result, air accumulates in the float chamber 13 in the guide wall of the float guide 10. The air in the float chamber 13 is used for replenishing the hydraulic fluid when the filter assembly housing 9
And the filter assembly 11, the filter 12, the atmosphere communication part 16
Since it cannot flow out of the reservoir body via d and 20a, it becomes difficult to replace the air inside and outside the reservoir body 1, and it takes time to replenish the working fluid when replenishing the working fluid, or the replenishment of the working fluid is delayed. Therefore, the hydraulic fluid may overflow from the reservoir tank. Further, the float 14 does not float up even though the hydraulic fluid is sufficiently supplied to the reservoir tank, and the float 14 continues to turn on the reed switch 15. Therefore, the liquid level alarm device connected to the reed switch 15 May continue to give an alarm, and it may be mistaken for a failure.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reservoir tank capable of promptly replenishing hydraulic fluid and preventing an abnormal occurrence of a liquid level alarm.

"Means for Solving the Problem" The present invention has the following configuration in order to achieve the above object. That is, an atmosphere communicating portion that communicates with the atmosphere is provided in the upper portion, and a reservoir body that can store a working fluid therein, a cylindrical portion that extends vertically in the reservoir body, a bottom portion and a side wall are provided. A filter assembly that has a filter portion and is placed on the tubular portion, and is formed below the placement position of the filter assembly of the tubular portion, and in the vicinity of the tubular portion, a guide wall is formed on the entire circumference thereof. In a reservoir tank including a formed float guide and a float that is vertically movably guided by the float guide, in the contact surface portion between the filter assembly and the tubular portion, the inside of the float guide and the reservoir body are It is characterized in that a communication passage communicating with the atmosphere communication portion is formed.

[Operation] According to the above configuration, even if the viscosity of the hydraulic fluid increases to form a film in the filter portion at low temperature, or the hydraulic fluid forms a film in the filter portion when replenishing the hydraulic fluid, A place where the atmosphere can flow into and out of the reservoir body, especially the guide wall of the float guide through the communication passage provided in the contact surface between the assembly and the cylinder, and the atmosphere communication portion of the reservoir body, and a sealed chamber state is formed in the reservoir tank. Therefore, the liquid replenishment can be quickly performed, the followability of the float in the float guide to the change of the liquid level can be improved, and the abnormal occurrence of the liquid level alarm can be prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In this embodiment, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 21 in FIG. 1 denotes a filter assembly housed in the filter assembly housing portion 9. The filter assembly 21 has a cylindrical side wall 21b having a bottom portion 21a, as shown in FIGS. 2 and 3.
A flange 21c is formed on the upper part of the filter, and a filter having a mesh with two half-moon shaped holes 21d formed on the bottom 21a as shown in FIG. 2 and a plurality of side wall holes 21e formed on the side walls 21b.
It is cup-shaped as a whole provided with 2. A groove (communication passage) 21g for communicating air is formed on the outer bottom surface 21f of the filter assembly 21 as described later.

The filter assembly 21 is accommodated in the filter assembly accommodating portion 9 by placing the bottom portion 21a on the bottom portion 9a of the filter assembly accommodating portion 9 and seating it.

In the reservoir tank of the present embodiment, when the viscosity of the working fluid increases at low temperature and the working fluid becomes a film in the mesh portion of the filter 12, or when the working fluid is replenished, the working fluid forms a film in the mesh portion of the filter 12. In this case, since the groove 21g is provided on the outer bottom surface 21f of the filter assembly 21, the bottom 9a of the filter assembly housing 9 and the filter assembly
The outer bottom surface 21f of 21 does not face seal.

Therefore, since the guide wall of the float guide 10 formed in a cylindrical shape surrounds the float 14 all around, and the liquid adhering to the mesh portion of the filter 12 forms a film, the guide of the float guide 10 is formed. Float room 13 in the wall
Even if the air is abnormally accumulated inside, the air in the float chamber 13 will not allow the air in the float chamber 13 to sit on the bottom 9a of the filter assembly housing 9 in the groove 21g of the filter assembly 21, the filter 12 on the side wall of the filter assembly 21 Between the inner surface of the side wall of the assembly accommodating portion 9 and the outer surface of the side wall of the filter assembly 21, or the filter assembly.
Between the filter 12 on the side wall of 21 and the inner surface of the side wall of the filter assembly accommodating portion 9 and the outer surface of the side wall of the filter assembly 21, the air flows out through the opening 1c of the reservoir body 1 to the atmosphere, and abnormal air enters the float chamber 13. Prevent accumulation. As a result, the float 14 does not float up even though the hydraulic fluid is sufficiently supplied to the reservoir tank, and the float 14 is connected to the reed switch 15 to keep the reed switch 15 ON. It prevents abnormal occurrence of liquid level alarm such that the device keeps giving an alarm, eliminates the trouble of mistakenly thinking that a failure has occurred, and promptly replenishes hydraulic fluid.

As described above, according to the present embodiment, the atmosphere in the float chamber 13 can be easily replaced, so that there is no portion in the reservoir tank that is in the sealed chamber state, and the hydraulic fluid can be quickly replenished. Therefore, when the working fluid is replenished, abnormal air is accumulated in the float chamber 13 or the working fluid replenishment is delayed and the working fluid replenishment is delayed.
Since the float 14 smoothly moves up and down according to the change in the liquid level in the reservoir body 1, the followability to the change in the liquid level of the float 14 is improved, and the alarm device gives an abnormal alarm. It is possible to eliminate the risk of mistakenly recognizing that a failure has occurred.

Further, in the present embodiment, the filter assembly housing portion 9
Since ribs 9b are provided on the inner peripheral surface of the side wall of the filter assembly, when the filter assembly 21 is assembled in an inverted manner, the filter assembly 21 projects from the reservoir body 1, so that the filter assembly 21 is erroneously assembled. Can be prevented.

(The above is the first embodiment).

Although the groove 21g is provided in the bottom portion 21a of the filter assembly 21 in the above-described embodiment, the invention is not limited to this. For example, as shown in FIG.
A plurality of ribs 32 are provided on the inner peripheral surface of the side wall 31b of 31 so as to extend in the vertical direction and are circumferentially spaced from each other, and the flange 11c of the filter assembly 11 is placed on the upper end surface of these ribs 32 to form a filter assembly. The filter assembly 11 is held in the housing portion 31, and a gap (communication passage) 33 is provided between the bottom portion 11a of the filter assembly 11 and the bottom portion 31a of the filter assembly housing portion 31 to provide the bottom portion 11a of the filter assembly 11. It may be possible to prevent the face seal between the filter assembly housing portion 31 and the bottom portion 31a. In this embodiment as well, as in the first embodiment, the filter assembly housing portion
Since the rib 32 is provided on the inner peripheral surface of the side wall of 31, the filter assembly 11 can be prevented from being erroneously assembled (the second embodiment described above).

In addition, in the first embodiment, the filter assembly 21
Although the groove 21g is provided in the bottom portion 21a of the above, the present invention is not limited to this, and for example, as shown in FIG.
A groove-shaped notch (communication passage) 42 is provided over the bottom portion 41a and the side wall 41b of the 41 so that the air in the float chamber 13 can flow out of the reservoir body 1 through the notch 42, and the atmosphere can be stored in the reservoir. It may be allowed to flow into the float chamber 13 of the main body 1 (the above is the third embodiment).

[Advantages of the Invention] According to the present invention, an atmosphere communicating portion that communicates with the atmosphere is provided in the upper portion, and a reservoir body that can store a working fluid therein and a vertically extending inside the reservoir body are provided. A tubular portion, a filter assembly having a filter portion on the bottom and side walls and placed on the tubular portion, and a tubular portion formed below the placement position of the filter assembly of the tubular portion. In a reservoir tank provided with a float guide in which a guide wall is formed on the entire circumference in the vicinity and a float that is vertically movable by the float guide, in a contact surface portion between the filter assembly and the tubular portion, Since the communication passage that connects the inside of the float guide and the atmosphere communication portion of the reservoir body is formed, even if the viscosity of the liquid increases at low temperature and the working liquid becomes a film in the filter portion, or Even if the working fluid becomes a film in the filter portion when replenishing the moving fluid, the air in the guide wall of the float guide can easily flow out of the reservoir main body through the communication passage and the atmosphere communication portion. Since there is no place in a sealed chamber, the hydraulic fluid can be quickly replenished, abnormal air can be created in the guide wall of the float guide when replenishing the hydraulic fluid, and it takes time to replenish the hydraulic fluid. It is possible to prevent the hydraulic fluid from overflowing the reservoir tank due to the delay in replenishment, and the float in the float guide can smoothly follow the liquid level change in the reservoir body to move up and down. The ability to follow surface changes is improved, and it is possible to eliminate the possibility of mistakenly recognizing that a failure has occurred due to the alarm device continuing to issue an abnormal alarm.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
FIG. 1 is a vertical cross-sectional view of an essential part, FIG. 2 is a bottom view of a filter assembly, FIG. 3 is a view taken in the direction of arrow III in FIG. 2, and FIG. 4 is an essential part showing a second embodiment of the present invention. FIG. 5 is a sectional view of the third embodiment of the present invention.
FIGS. 6 to 8 show an example of a conventional reservoir tank, FIG. 6 is a longitudinal sectional view, FIG. 7 is a longitudinal sectional view of a reservoir body, and FIG. The drawing is a sectional view taken along the line VIII-VIII in FIG. 1 ... Reservoir body, 6,10 ... Float guide, 9,31,4
1 ... Filter assembly housing (cylindrical part), 11, 21 ... Filter assembly, 9a, 11a, 21a, 31a, 41a ... Bottom, 12 ... Filter, 14 ... Float, 16d ... Ventilation groove (Atmosphere communication part), 2
0a …… slit (atmosphere communication part), 21f …… outer bottom surface, 21g…
… Grooves (communications), 32 …… ribs, 33 …… gaps (communications),
42 ... Notch (passage).

Claims (4)

[Scope of utility model registration request] 1. An atmosphere communication part (16d, 20) that communicates with the atmosphere at the top.
a) provided with a reservoir body (1) capable of storing a working fluid therein, a cylindrical portion (9, 31, 41) provided in the reservoir body so as to extend in the vertical direction, and a bottom portion (11a). , 2
1a) and the side wall (11b, 21b) has a filter part (12) and is mounted on the tubular part (11, 21), and the mounting position of the filter assembly on the tubular part A reservoir having a float guide (6, 10) formed below and having guide walls formed on the entire circumference in the vicinity of the tubular portion, and a float (14) guided by the float guide to be vertically movable. In the tank, a communication passage (21g, 33, 42) for connecting the inside of the float guide and the atmosphere communication portion of the reservoir body to a contact surface portion between the filter assembly and the cylindrical portion.
A reservoir tank characterized by being formed. 2. The communication passage is a notch (21g) provided in a bottom portion of the filter assembly for communicating a space between the tubular portion and the filter assembly with the inside of the float guide. The reservoir tank according to claim 1. 3. The communication passage is a notch (42) provided on the side of the tubular portion for communicating the space between the tubular portion and the filter assembly with the inside of the float guide. The reservoir tank according to item (1). 4. A rib for supporting the filter assembly on the tubular portion in the vicinity of the float guide so that a gap (33) is formed between the bottom portion of the filter assembly and the tubular portion. 32) The reservoir tank according to claim 1, characterized in that 32) is provided and the gap serves as the communication passage.