JP2552064Y2 - Reservoir for hydraulic booster - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reservoir for storing hydraulic oil of a hydraulic booster comprising a combination of a hydraulic booster and a master cylinder, and more particularly, to a delivery pipe connected to an inlet of a hydraulic booster via a hydraulic pump. A filter that forms a return pipe connected to the outlet of the hydraulic booster and a flow path communicating between the delivery pipe and the return pipe in the reservoir body, and filters hydraulic oil from the return pipe to the delivery pipe in the flow path.ゝ Improvements

[0002]

2. Description of the Related Art Such a reservoir is disclosed, for example, in Japanese Utility Model Application Laid-open No. Hei 3-3.
It is already known as disclosed in Japanese Patent No. 7071.

[0003]

As disclosed in the above-mentioned publication, the conventional reservoir has a filter mounted on the opening of the delivery pipe to the flow path, so that the operation of returning from the hydraulic booster to the reservoir is performed. Oil that can be filtered by the above filter. Dust that has been prevented from entering the flow path by the above filter can be used for the condition of the hose connecting the outlet of the hydraulic booster and the return pipe, and the pressure generated in the hose. There is a possibility that the fluid may flow backward to the hydraulic booster side due to the pulsation of the fluid.

The present invention has been made in view of the above circumstances, and filters the hydraulic oil refluxed from the hydraulic booster in the flow passage, and holds separated dust in the flow passage to the hydraulic booster side. It is an object of the present invention to provide the above-mentioned reservoir which is prevented from flowing backward.

[0005]

In order to achieve the above object, according to the present invention, a plate-like filter traversing the flow path is provided upstream of the flow path so as to define a filtration chamber. The first feature is that a return pipe whose upper end discharge port opens to the filtration chamber at a position above the bottom wall is connected to the bottom wall.

According to the present invention, in addition to the above features, the filter is constituted by a frame having a grid and a net stretched on a side of the frame facing the filtration chamber. Features.

[0007] In addition to the first feature, the present invention further comprises a synthetic resin upper half having an upper half of the flow path and a synthetic resin having a lower half of the flow path. And a lower half made of stainless steel are welded to each other, and the filter is fitted into a pair of opposing guide grooves formed on the inner surface of the flow path over the upper and lower halves. 3.

Further, in the present invention, in addition to the first feature, the reservoir body is made of a synthetic resin upper half having an upper half of the flow path and a synthetic resin upper half having a lower half of the flow path. A resin lower half is welded to each other, and the filter is integrally formed on one of the upper and lower halves. The free end of this filter is formed on the other of the upper and lower halves. The third feature is that the guide groove is fitted into the guide groove.

Further, in the present invention, in addition to the first feature, the reservoir main body is made of a synthetic resin upper half having an upper half of the flow path and a synthetic resin upper half having a lower half of the flow path. A resin lower half is welded to each other, and the filter is formed of a synthetic resin upper filter supported by the upper half and a synthetic resin lower filter supported by the lower half. The fifth feature is that the upper and lower filters are welded to each other.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

First, a first embodiment shown in FIGS. 1 to 7 will be described. In FIG. 1, a hydraulic booster B operated by a brake pedal 1 is mounted via a stud bolt 2 on a front surface of a dashboard in an engine room of an automobile, and has a front end for a brake operated by an output of the hydraulic booster B at a front end thereof. A tandem type master cylinder M is connected. These hydraulic booster B and master cylinder M
Is arranged forward and upward in order to shorten the horizontal projection length to the engine room and to improve the maintainability.

Above the master cylinder M, a reservoir R for storing hydraulic oil common to the master cylinder M and the hydraulic booster B is provided.

A delivery pipe 4 and a return pipe 5 project from the lower surface of the reservoir R. The delivery pipe 4 is connected to a suction port of a hydraulic pump 7 driven by an electric motor or other driving means 6 through a first hose 8 _1. The discharge port of the hydraulic pump 7 is connected to an inlet 9 connected to an inlet valve of the hydraulic booster B.
The second through the hose 8 ₂ is connected to, the second hose 8
_The accumulator 10 is connected to an intermediate portion of the _second . The return pipe 5 has a third outlet at the outlet 11 connected to the outlet valve of the hydraulic booster B.
It is connected via a hose 8 _3.

2 and 3, the reservoir R has a single synthetic resin reservoir body 12 having a substantially rectangular box shape in a plan view, and this reservoir body 12 is divided on a horizontal plane for convenience in molding. Upper and lower halves 13, 14
Consists of At opposite ends of the upper and lower halves 13, 14, flanges 13a, 14a are formed.
The two halves 13 and 14 are joined by welding the two flanges 13a and 14a to each other.

On the bottom wall of the reservoir R, a short connection tube 15 protruding from a substantially central portion of the lower surface is integrally formed, and a mounting plate 16 is embedded in the connection tube 15.

On the other hand, the cylinder body 1 of the master cylinder M
On the upper side, a cylindrical oil sump 18 and a partition wall 19 for partitioning the inside thereof into first and second oil sump chambers 18a and 18b are protruded, and a cylinder is provided from the first and second oil sump chambers 18a and 18b. Hydraulic oil is supplied to a pair of front and rear hydraulic chambers in the main body 17.

The connection cylinder 15 is fitted to the oil reservoir 18 in an oil-tight manner via a seal member 20 such as an O-ring, and the mounting plate 16 is fixed to the partition wall 19 by screws 21. The mounting plate 16 has a through hole 22 and does not hinder the flow of hydraulic oil.

On the upper wall of the upper half 13, there is provided the connecting tube 15.
A fuel supply port 24 is provided coaxially with the
Is applied.

On the bottom wall of the lower half 14, a guide tube 2 erected from the upper surface and surrounding the upper opening of the connection tube 15 is provided.
3 is formed integrally, and the upper end thereof is opened immediately below the oil supply port 24. A plurality of vertical slits 26 communicating the inside and outside of the guide cylinder 23 are cut at intervals in the circumferential direction.

In the guide cylinder 23, the upper end is provided with the oil supply port 24.
A cylindrical filter 27 that fits into the filter 27 is provided. In the filter 27, a level sensor 28 attached to the cap 25 is provided. The level sensor 28 is of a known float type which outputs an electric signal to an alarm (not shown) when the oil level in the reservoir R falls below a specified level. The filter 27 includes a plurality of leg pieces 27a supported on the mounting plate 16 of the connection tube 15.

The reservoir body 12 has a rectangular cylindrical partition wall 2 connecting the upper wall and the bottom wall and surrounding the guide cylinder 23.
9 are integrally formed. The partition wall 29 defines a central chamber 30 inside thereof, and defines an outer chamber 31 as a flow path surrounding the central chamber 30 between the central chamber 30 and the peripheral wall of the reservoir body 12.

Further, the outer chamber 31 is divided into three chambers of a delivery chamber 32, a filtration chamber 33 and a defoaming chamber 34 along the circumferential direction.

That is, first, the delivery chamber 32 is defined at one corner of the outer chamber 31 by the partition wall 35 and the weir plate 36, and the cut-out communication part 37 (see FIG. 6) provided at one corner of the partition wall 29. To communicate with the central room 30.

The partition wall 35 is formed integrally with the reservoir body 12 so as to cross the outer chamber 31. Further, the weir plate 36 extends over the upper and lower halves 13 and 14 to form the outer chamber 31.
Opposing guide grooves 38, 3 formed on the inner surface of
8 At this time, as clearly shown in FIG. 2, a ventilation path 39 and an oil path 40 communicating between the delivery chamber 32 and the defoaming chamber 34 remain above and below the weir plate 36.

As shown in FIG. 5, on the bottom wall of the delivery chamber 32, a mounting cylinder 41 protruding from the upper surface thereof and the delivery pipe 4 projecting from the lower surface thereof and connected to the mounting cylinder 41 are integrally formed. A cylindrical filter 42 is fitted in the mounting cylinder 41.

3 and 5, the filtration chamber 33 is defined by the partition wall 35 and a plate-shaped filter facing the partition wall 35, that is, a filter plate 43. The return pipe 5 is formed integrally with the bottom wall of the filtration chamber 33 and extends vertically therethrough.
A discharge port 5a that opens toward the partition wall 35 at a position higher than the bottom wall is provided. Also, on the upper surface of the bottom wall of the filtration chamber 33,
The annular refuse pool 51 surrounding the return pipe 5 is
3 is recessed below the lower end.

As shown in FIGS. 5 and 7, the filter plate 43 has a pair of opposing guide grooves 44, 44 formed on the inner surface of the outer chamber 31 over the upper and lower halves 13, 14.
Is inserted into. At this time, a ventilation path 47 communicating between the filtration chamber 33 and the defoaming chamber 34 remains above the filter plate 43.

The filter plate 43 comprises a rectangular synthetic resin frame 45 having a lattice 45a, and a synthetic resin net 46 molded on one side of the frame. When the filter plate 43 is fitted into the guide grooves 44, the surface on the net 46 side is arranged to face the filtration chamber 33. According to such an arrangement, when the hydraulic oil in the filtration chamber 33 is filtered by the net 46, the remaining dust can be prevented from being deposited on the grid 45a.

The mesh of the filter 27 in the guide cylinder 23 is set to be equal to or smaller than that of the filter plate 43, and the mesh of the filter 42 in the delivery chamber 32 is smaller than that of the filter plate 43. Coarsely set.

The defoaming chamber 34 is connected from the outer chamber 31 to the delivery chamber 32.
And the remaining portion excluding the filtration chamber 33. That is, it is formed in a long passage shape starting from the filter plate 43 and going around three corners of the partition wall 29 to reach the weir plate 36.

The partition wall 29 and the partition wall 35 are also divided into upper and lower halves 13 and 14 in the same manner as the upper and lower halves 13 and 14 for convenience in molding, and these divided surfaces are used for welding the upper and lower halves 13 and 14. Welded at the same time.

As shown in FIGS. 2 and 4, in order to make the volume of the outer chamber 31 as large as possible, a U-shaped bulging portion 48 surrounding the rear half of the oil reservoir 18 of the master cylinder M is provided with the reservoir main body 12. Formed on the bottom wall. The swelling portion 48 is provided in the oil reservoir 18 because the master cylinder M is arranged at a forward upward inclination.
It is placed in the dead space created around it.

On the outer peripheral surface of the reservoir body 12, upper and lower marks 49 and 50 indicating upper and lower levels of the stored oil level therein are formed in a rib shape. In the illustrated example, the upper limit mark 49 is attached to the flange 1
3a and 14a. Thus, the air passage 3
9 and 47 are provided at a position higher than the upper limit mark 49, and the oil passage 40 is provided at a position lower than the lower limit mark 50.

Next, the operation of this embodiment will be described.

When the hydraulic oil is injected into the reservoir R,
The cap 25 is removed, and the fuel is injected into the filter 27 from the filler port 24. The injected hydraulic oil is filtered by the filter 27 and then passes through the vertical slit 26 of the guide cylinder 23 to form the central chamber 30.
In addition to filling the entirety, the first and second oil reservoirs 18a and 18b are also filled through the through holes 22 and 22. The hydraulic oil in the central chamber 30 sequentially flows into the delivery chamber 32 through the communication portion 37, further flows into the defoaming chamber 34 through the oil passage 40, and further flows into the filtration chamber 33 through the filter plate 43. Fill them well.

[0036] In Thus, if operation of the hydraulic pump 7, after the hydraulic fluid in the delivery chamber 32 is filtered by the filter 42, is sucked into the hydraulic pump 7 through the delivery tube 4 and the first hose 8 _1, pressure the second discharged to the hose ₈₂ becomes oil stored in the accumulator 10.

[0037] Therefore, the actuation and release of the hydraulic booster B is repeated, or the pressure oil in the accumulator 10 is supplied to the boost chamber of the hydraulic booster B, flows out pressurized oil of the boost chamber to the third hose 8 _3, The liquid is discharged from the discharge port 5 a to the filtration chamber 33 through the return pipe 5.

At this time, the discharge port 5a is connected to the filter plate 4
Because it opens toward the partition wall 35 on the opposite side from 3,
The pressure oil discharged vigorously from the discharge port 5a collides with the partition wall 35 and attenuates, so that a large pressure is not applied to the filter plate 43. Further, the pressure oil discharged into the filtration chamber 33 is rapidly decompressed immediately to the atmospheric pressure, so that a relatively large amount of air bubbles are generated. However, most of these air bubbles flow into the defoaming chamber 34 together with the dust by the filter plate 43. Will be blocked. The dust separated from the hydraulic oil accumulates on the bottom wall of the filtration chamber 33, especially in the dust trap 51, and does not flow back to the discharge port 5a at a high place.

However, the undeveloped fine air bubbles flow into the defoaming chamber 34 through the filter plate 43 together with the hydraulic oil. However, since the defoaming chamber 34 is formed longer as it goes around the three corners of the partition 29, The undeveloped gas bubbles float on the oil surface while developing largely while moving through the chamber 34 toward the delivery chamber 32. Therefore, the operating oil in the defoaming chamber 34 is
As the air pressure approaches, air bubbles decrease, especially at the bottom.

The hydraulic oil from which the air bubbles have been removed is supplied to the weir plate 3
6 and return to the delivery chamber 32 through the oil passage 40 below. At this time, if air bubbles enter the delivery chamber 32 from the defoaming chamber 34,
Since the air bubbles are blocked by the filter 42, normal working oil containing almost no air bubbles can be sent from the delivery chamber 32 to the delivery pipe 4. Thereafter, the same circulation is repeated.

Since the hydraulic oil is filtered by the filter plate 43 as described above until it returns to the delivery chamber 32, the filter 42 for filtering the hydraulic oil delivered from the delivery chamber 32 has a larger mesh than the filter plate 43. Suffices, thereby reducing the sending resistance and reducing the load on the hydraulic pump 7.

The upper portions of the delivery chamber 32, the filtration chamber 33, and the defoaming chamber 34 communicate with each other through ventilation paths 39 and 47, communicate with the central chamber 30 through a communication portion 37, and with the center. Since the chamber 30 communicates with the atmosphere via the breather passage of the cap 25, each of the chambers 30, 32, 33,
34 can breathe without hindrance.

In the above embodiment, the present invention is applied to a hydraulic booster in which the hydraulic booster B and the master cylinder M are connected coaxially. However, the hydraulic booster B and the master cylinder M are separately arranged. The present invention is also applicable to a configuration in which the two are connected via a hydraulic conduit.

FIG. 8 shows a second embodiment of the present invention.
The filter plate 43 is fitted into the upper filter 43a made of synthetic resin fitted into the guide grooves 44, 44 on the upper half 13 side of the reservoir body 12, and into the guide grooves 44, 44 on the lower half body 14 side. Divided into a synthetic resin lower filter 43b,
The upper and lower filters 43a and 43b have the same configuration as the previous embodiment except that they are welded simultaneously with the welding of the upper and lower halves 13 and 14. According to this embodiment, the upper and lower filters 43a and 43b are preliminarily provided with the upper and lower halves 1 respectively.
Since it can be mounted on the third and the fourth, the assemblability is good. In addition, when the upper and lower filters 43a and 43b are welded, there is no problem even if there is a slight displacement between them, and therefore, the upper and lower halves 13, 14 are provided at the welded portions.
Mutual manufacturing errors can be absorbed.

FIG. 9 shows a third embodiment of the present invention.
The filter plate 43 is divided into an upper filter 43a integrally formed with the upper half 13 of the reservoir body 12 and a lower filter 43b integrally formed with the lower half 14, and these are separated from each other.
The lower filters 43a, 43b are connected to the upper and lower halves 13, 1
The structure is the same as that of the first embodiment except that it is welded simultaneously with the welding of No. 4.

According to this embodiment, the structure can be simplified by integrating the reservoir body 12 and the filter plate 43. Further, since there is no gap at the periphery of the filter plate 43, a reliable filtering action can be expected.

FIG. 10 shows a fourth embodiment of the present invention, in which a filter plate 43 is attached to the lower half 14 of the reservoir body 12.
Except that the upper half protruding toward the upper half 13 of the filter plate 43 is fitted into a pair of opposing guide grooves 44 formed only in the upper half 13. ,
The configuration is the same as that of the first embodiment. In this case, the filter plate 43 is integrally formed on the upper half 13 and the lower half 1
4 may be formed with guide grooves 44, 44.

According to this embodiment, the number of parts can be reduced and the assembling property can be improved.

[0049]

As described above, according to the first feature of the present invention, a plate-like filter is provided across the flow path to define a filtration chamber on the upstream side of the flow path. A return pipe having a discharge port at the upper end opened to the filtration chamber at a position above the bottom wall is connected to the wall, so that the hydraulic oil returned from the hydraulic booster through the return pipe can be filtered through a part of the flow path. The separated dust can be precipitated at the bottom of the filtration chamber while being filtered by a filter in the chamber. In particular, since the discharge port of the return pipe is opened at a position higher than the bottom wall of the filtration chamber, it is possible to prevent the debris settled as described above from flowing back to the return pipe, and thus to the hydraulic booster.

According to a second feature of the present invention, the filter is composed of a frame having a lattice and a net stretched on a side of the frame facing the filtration chamber, so that the filter has a plate shape. In the filter described above, the deformation of the net can be prevented as much as possible by the frame grid, and the dirt separated by the net can be deposited at the bottom of the filtration chamber without adhering to the grid. Thus, it is possible to avoid such a problem that clogging of the net occurs.

According to a third feature of the present invention, the reservoir body is composed of an upper half made of synthetic resin having an upper half of the flow path and a lower half made of synthetic resin having a lower half of the flow path. The filter is fitted into a pair of opposing guide grooves formed on the inner surface of the flow path over the upper and lower halves, so that the reservoir body is formed. At the same time, the filter can be held, so that there is no need to provide a special filter stopper, and the structure is simple.

Further, according to a fourth feature of the present invention,
The reservoir body is formed by mutually welding an upper half made of synthetic resin having an upper half of the flow path and a lower half made of synthetic resin having a lower half of the flow path. The filter is integrally formed on one of the lower halves, and the free end side of the filter is fitted into the guide groove formed on the other of the upper and lower halves, contributing to a reduction in the number of parts and an improvement in assemblability. I can do it.

According to a fifth feature of the present invention,
The reservoir body is configured by mutually welding an upper half made of synthetic resin having an upper half of a flow path and a lower half made of synthetic resin having a lower half of the flow path, and forming the filter. Since the upper filter made of a synthetic resin supported by the upper half and the lower filter made of a synthetic resin supported by the lower half are divided and these upper and lower filters are welded to each other,
The manufacturing error between the upper and lower halves can be absorbed by the junction between the upper and lower filters, which facilitates manufacturing.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic booster according to a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a reservoir part shown in FIG.
2 line cross section)

FIG. 3 is an exploded perspective view of the reservoir.

FIG. 4 is a perspective view of the lower half of the reservoir as viewed from below.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 5;

FIG. 8 is a sectional view showing a second embodiment of the present invention and corresponding to FIG. 7;

FIG. 9 is a sectional view corresponding to FIG. 7, showing a third embodiment of the present invention;

FIG. 10 is a sectional view showing a fourth embodiment of the present invention and corresponding to FIG. 7;

[Explanation of symbols]

 Reference Signs List 4 delivery pipe 5 return pipe 5a discharge pipe 7 hydraulic pump 9 inflow port 11 outflow port 31 outer chamber 33 as flow path 33 filtration chamber 43 filter plate as filter 43a upper filter 43b lower filter 44 guide groove 45 frame 45a grid 46 mesh B Hydraulic booster R Reservoir

Claims (5)

(57) [Scope of request for utility model registration] 1. A delivery pipe (4) connected to an inlet (9) of a hydraulic booster (B) via a hydraulic pump (7), and a return pipe (5) connected to an outlet (11) of the hydraulic booster (B). )
And a flow path (31) communicating between the delivery pipe (4) and the return pipe (5) are formed in the reservoir body (12), and the return pipe (5) is connected to the flow path (31) from the return pipe (5). In a reservoir for a hydraulic booster provided with a filter (43) for filtering hydraulic oil toward (4), the flow path (31) is formed so as to define a filtration chamber (33) upstream of the flow path (31). ) Is provided in the bottom wall of the filtration chamber (33).
(a) a reservoir for a hydraulic booster, characterized in that a return pipe (5) opening to the filtration chamber (33) is provided continuously above the bottom wall. 2. The filter according to claim 1, wherein the filter (43) is provided on a frame (45) having a grid (45a), and on a side of the frame (45) facing the filtration chamber (33). A reservoir for a hydraulic booster, comprising: a stretched net (46). 3. The device according to claim 1, wherein the reservoir body (12) is made of a synthetic resin upper half (13) having an upper half of the flow path (31), and the flow path (31). ) Lower half made of synthetic resin having a lower half (1)
4) and the upper and lower halves (1).
The filter (4) is inserted into a pair of opposing guide grooves (44) formed on the inner surface of the flow path (31) over (3, 14).
3) A reservoir for a hydraulic booster, wherein 3) is fitted. 4. The device according to claim 1, wherein the reservoir body (12) is made of a synthetic resin upper half (13) having an upper half of the flow path (31), and the flow path (31). ) Lower half made of synthetic resin having a lower half (1)
4) and the upper and lower halves (1).
3, 14), the filter (43) is integrally formed, and the free end side of the filter (43) is inserted into a guide groove (44) formed in the other of the upper and lower halves (13, 14). A reservoir for a hydraulic booster, which is fitted. 5. The device according to claim 1, wherein the reservoir body (12) is formed of a synthetic resin upper half (13) having an upper half of the flow path (31), and the flow path (31). ) Lower half made of synthetic resin having a lower half (1)
4) and the filter (43).
Is divided into a synthetic resin upper filter (43a) supported by the upper half (13) and a synthetic resin lower filter (43b) supported by the lower half (14). A reservoir for a hydraulic booster, wherein upper and lower filters (43a, 43b) are welded to each other.