JPH08216866A - Reservoir - Google Patents

Abstract

PURPOSE: To prevent a splash due to a collision of spraying hydraulic fluid out of an oil guide pipe with a ceiling wall from going beyond a partition wall by installing a projecting wall projecting downward from the ceiling wall in an upper half body extending over an interval between both sides of an oil sump part at an intermediate position between the oil guide pipe and the partition wall. CONSTITUTION: When a piston rod 18 is pushed frontward by a brake operation, a longitudinal piston 3 advances forward as compressing two return springs 10 and 11, generating hydraulic pressure in two front and rear hydraulic chambers 4 and 5, and each wheel brake is operated for braking. Incidentally, in the case where a brake hydraulic circuit ranging to the front hydraulic chamber 4 is broken down, a leakage of hydraulic fluid occurs, and thereby this hydraulic fluid is stored in a rear oil sump chamber 43 alone, an excessive portion of the hydraulic fluid out of the rear hydraulic chamber 5 is sprayed into this rear oil sump chamber 43 from a rear oil guide pipe at the initial stage of braking operation of a master cylinder M, etc. However, since a projecting wall 57 projecting downward from a ceiling wall 29a in space between the rear oil guide pipe 36 and a partition wall 44 is installed in an upper half body 25, any splash attending on a collision with the ceiling wall 29a can be restrained from scattering to the side of the partition wall 44.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reservoir body made of synthetic resin, which comprises an upper half body and a lower half body welded to each other and is joined to a cylinder body of a tandem master cylinder. An oil reservoir having a portion as a ceiling wall is formed, and the inner ends of a pair of oil guide pipes provided in the lower half through the pair of front and rear relief ports provided in the cylinder body are at least one of the inner ends thereof. Is opened at the bottom of the oil reservoir so as to face the ceiling wall, and the inside of the oil reservoir is
The present invention relates to a reservoir partitioned by a partition wall provided in the lower half body into a pair of oil reservoirs that individually communicate with both oil guide pipes.

[0002]

2. Description of the Related Art Conventionally, such a reservoir is already known, for example, from Japanese Patent Application Laid-Open No. 5-270389.

[0003]

The partition wall of such a reservoir is provided on the other side of the braking hydraulic circuit when the hydraulic oil leaks out of one of the pair of braking hydraulic circuits connected to the tandem type master cylinder independently of each other. In order to secure the braking fluid, the inside of the oil reservoir is divided into a pair of oil reservoirs. On the other hand, in the master cylinder, an excessive amount of hydraulic oil in the hydraulic chamber is vigorously returned from the relief port to the oil reservoir of the reservoir when starting and retracting the piston whose front end faces the hydraulic chamber. In the state where hydraulic oil is leaking in one of the braking hydraulic circuits, the inner end of the oil guide pipe connected to the relief port on the side of the oil reservoir that secures the hydraulic oil opens facing the ceiling wall. In this case, the hydraulic oil ejected from the relief port through the oil guide pipe into the oil reservoir chamber collides with the ceiling wall and is scattered, and the droplets move over the partition wall to the other oil reservoir chamber, and the one oil The amount of hydraulic fluid stored in the reservoir may decrease.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reservoir in which reflected splash of hydraulic oil from the ceiling wall is prevented from moving between the oil reservoirs.

[0005]

In order to achieve the above object, the invention according to claim 1 is such that an upper half body and a lower half body are welded to each other and are connected to a cylinder body of a tandem type master cylinder. An oil reservoir with a ceiling wall partially formed in the upper half of the reservoir body made of synthetic resin
Inner ends of a pair of oil guiding pipes provided in the lower half body respectively communicating with a pair of front and rear relief ports provided in the cylinder body, and at least one of the inner ends is opposed to the ceiling wall, and the bottom portion of the oil sump is formed. In the reservoir that is divided into a pair of oil reservoirs that are opened to the inside of the oil reservoir and communicate with both oil guide pipes individually by the partition wall provided in the lower half, the oil guide pipe with the inner end opening facing the ceiling wall The upper half body is provided with a projecting wall projecting downward from the ceiling wall over the both sides of the oil sump portion at an intermediate position between the partition wall and the partition wall.

According to the second aspect of the invention, in addition to the structure of the first aspect of the invention, the projecting wall is provided with an opening having the ceiling wall as an upper edge.

[0007]

According to the structure of the first aspect of the present invention, the projecting wall prevents reflection splashes from the ceiling wall from crossing the partition wall.

Further, according to the configuration of the invention described in claim 2, it is possible to avoid the occurrence of air accumulation by the projecting wall by allowing the air to flow through the opening.

[0009]

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

1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view of a reservoir and a master cylinder, which is a view taken in the direction of arrow 1 in FIG. 2, and FIG. FIG. 3 is a sectional view taken along line 2-3, and FIG.

First, in FIGS. 1 and 2, a master cylinder M is of a tandem type for a two-system hydraulic brake of an automobile, and a cylinder hole 1a provided in a cylinder body 1 thereof has a front end. The piston 2 and the rear piston 3 are slidably fitted in series, a front hydraulic chamber 4 is formed between the front end wall of the cylinder hole 1a and the front piston 2, and a rear hydraulic chamber 5 is provided between the pistons 2 and 3. Is formed.

A front output port 6 leading to the front hydraulic chamber 4,
A rear output port 7 communicating with the rear hydraulic chamber 5 is opened on the side surface of the cylinder body 1, and both output ports 6,
A hydraulic conduit (not shown) is connected to each of 7.

A rear piston 3 is provided at the rear end of the cylinder body 1.
A stop ring 8 for restricting the backward limit of the above is fixed, and a maximum interval restricting means 9 for restricting the maximum interval between the pistons 2, 3 is provided between the front piston 2 and the rear piston 3. A front return spring 10 that biases the front piston 2 in the backward direction is stored in the front hydraulic chamber 4, and a rear return spring 11 that biases the rear piston 3 in the backward direction is stored in the rear hydraulic chamber 5. It

The front piston 2 comprises a pair of front and rear piston portions 2a and 2b integrally connected via a rod portion 2c, and the front piston portion 2a is provided with the front piston portion 2a in front and rear directions. A plurality of through-holes 12 ... Penetrating therethrough are bored, and a cup seal 13 that covers these through-holes 12 ... Further, a cup seal 14 which is in sliding contact with the inner surface of the cylinder hole 1a is attached to the rear piston portion 2b.

A replenishment oil chamber 15 is formed in an annular shape between the pair of front and rear piston portions 2a and 2b.
Is provided in the upper wall of the cylinder body 1 and a relief port 17 that communicates with the front hydraulic chamber 4 immediately before the cup seal 13 when the front piston 2 is in the retracted limit.

The rear piston 3 integrally has a piston rod 18 which receives a boosting force from a negative pressure booster (not shown), and the piston rod 18 penetrates the stop ring 8 in an axially movable and liquid-tight manner. It is extended to the rear. Thus, the rear piston 3 is formed with a plurality of communication holes 19 ... Penetrating the rear piston 3 in the front-rear direction, and the communication holes 19 ... Are covered from the front side to form the cylinder hole 1a.
A cup seal 20 that is in sliding contact with the inner surface of the rear piston 3 is attached to the rear piston 3.

A replenishment oil chamber 21 is formed in an annular shape around the piston rod 18 between the rear piston 3 and the stop ring 8, and the supply port 22 which is always in communication with the replenishment oil chamber 21 and the rear piston 3 are set at the backward limit. A relief port 23, which communicates with the rear hydraulic chamber 5 immediately before the cup seal 20 when present, is provided on the upper wall of the cylinder body 1.

In the reservoir body 24 of the reservoir R, an upper half 25 made of synthetic resin having an open lower portion and a lower half body 26 made of synthetic resin having an open upper portion are provided at the lower open end and the lower portion of the upper half 25. The flanges 27 and 28 provided at the upper end opening of the half body 26 are integrally welded to each other.

The reservoir body 24 includes an upper half 25.
The oil sump 29 having the ceiling wall 29a as a part of the upper half 25
The ceiling wall 29a is formed between the lower half body 26 and the lower half body 26, and is substantially flat so as to be substantially parallel to the axis of the master cylinder M. Further, in the upper half 25, an oil supply cylinder portion 30 that is connected to the oil sump portion 29 at an angle with the ceiling wall 29a and extends upward, and a reinforcing rib provided between the oil supply cylinder portion 30 and the ceiling wall 29a. And 31 are formed.

By the way, in the upper part of the cylinder body 1, a front oil guide hole 33 in which the supply port 16 and the relief port 17 are commonly communicated, and a rear oil guide hole in which the supply port 22 and the relief port 23 are commonly communicated. A hole 34 and a front oil guide pipe 35 and a rear oil guide pipe 36 projecting from the lower half 26 of the reservoir body 24.
Are fitted into the front oil guide hole 33 and the rear oil guide hole 34 via the seal members 37 and 38, respectively, and both oil guide pipes 35 and 3 are
The inner end of 6 is opened at the bottom of the oil reservoir 29. Moreover, the reservoir body 24 and the cylinder body 1 are connected to each other by connecting the connecting arms 39 and 40 projecting from their opposing surfaces with the bolt 41.

Further, a partition wall 44 for partitioning the lower part of the oil reservoir 29 into a front oil reservoir chamber 42 and a rear oil reservoir chamber 43 is integrally provided on the inner surface of the lower half body 26. Supply port 16 and relief port 17 are provided in reservoir chamber 42.
The inner end of the front oil guide pipe 35 that communicates with the fuel tank is opened, and the supply port 22 and the relief port 2 are provided in the rear oil reservoir chamber 43.
The inner end of the rear oil guide pipe 36 leading to 3 is opened so as to face the ceiling wall 29a.

Referring also to FIG. 3, in the rear oil sump chamber 43, between the inner end opening of the rear oil guide pipe 36 and the partition wall 44, close to the rear oil guide pipe 36 side, the lower part of the lower half body 26. A baffle plate 55 is provided so as to protrude from each side, and both side ends of the baffle plate 55 are connected to both side portions of the lower half body 26. Thus, a relatively narrow channel 56 is formed in the center of the baffle plate 55. In this baffle plate 55, the oil level in the reservoir R is the partition wall 44.
When the pressure drops to the upper end of the rear oil pipe 3, the movement of the hydraulic oil due to vibration and tilting is suppressed as much as possible.
The flow passage 56 ensures the inflow of the hydraulic oil into the nozzle 6.

Further, at an intermediate position between the rear oil pipe 36 and the partition wall 44, the inner end opening of which faces the ceiling wall 29a, in this embodiment, at a position between the baffle plate 55 and the partition wall 44 and close to the baffle plate 55. In the upper half 25,
A projecting wall 57 projecting downward from the ceiling wall 29a is provided over both sides of the oil reservoir 29 so as to extend substantially along the axis of the above. Moreover, slit-shaped openings 58, 58 are provided at two positions spaced apart in the width direction of the projecting wall 57, extending vertically with the ceiling wall 29a as the upper end edge and opening at the lower end.

When the reservoir R is connected to the master cylinder M, as shown in FIG. 2, the axis of the refueling cylinder portion 30 is substantially vertical, and the upper end opening of the refueling cylinder portion 30. The part is closed by a cap 45 so that it can be opened and closed.

An outer end of a substantially cross-shaped support portion 46 is integrally fixed to the inner surface of the connecting portion of the oil supply cylinder portion 30 to the oil reservoir portion 29. Further, a plurality of guide protrusions 47 ... Extending in the axial direction of the fuel supply tubular portion 30 are provided on the inner surface of the fuel supply tubular portion 30 at intervals in the circumferential direction, and these guide projections 47 ... The float 48, which is guided to move up and down along the axis of the portion 30, is housed in the oil supply cylinder portion 30, and the float 48 has a magnet 48a built therein. Further, the reed switch 4 for detecting the oil level in the reservoir main body 24 by changing the switching mode when the float 48 descends to a predetermined level is provided on the support portion 46.
9 is provided, and a pair of lead wires 50 and 51 connected to the reed switch 49 are drawn out from the reservoir body 24 to the outside.

Both lead wires 5 are provided outside the reservoir body 24.
0 and 51 are covered with the covering tube 52, and the middle portion of the covering tube 52, that is, the middle portion of the lead wires 50 and 51 is elastically locked by the reinforcing rib 31. That is, the reinforcing ribs 31 are integrally provided with thick-walled locking portions 53 formed in a substantially U shape so as to project slightly on both sides of the reinforcing ribs 31, and are locked by the locking portions 53. A concave portion 54 is formed, and the intermediate portion of the covering tube 52 can be inserted into and removed from the locking concave portion 54 to temporarily elastically lock. That is, when transporting the reservoir R, when assembling the reservoir R to the master cylinder M, when mounting the reservoir R on the vehicle in a state where the reservoir R is assembled to the master cylinder M, and the like, relatively long lead wires 50 and 51 are provided. The intermediate portion of the lead wires 50 and 51 can be temporarily locked to the reinforcing rib 31 in order to prevent the lead wires from interfering with each other.

Moreover, since the locking ribs 54 for locking the lead wires 50, 51 are provided in the reinforcing ribs 31, the outer shape of the reservoir body 24 is not complicated, and the upper half of the reservoir body 24 does not become complicated. It is possible to simplify the outer shape of the body 25 and simplify the shape of the molding die for the upper half body 25 to facilitate the die manufacturing. Further, the strength reduction of the reinforcing rib 31 in the vicinity of the locking recess 54 is compensated by the thick thickness of the locking portion 53, and the lead wires 50, 51 are reliably held without being damaged.

The operation of this embodiment will now be described. When the piston rod 18 is pushed forward by a brake operation, the front piston 2 and the rear piston 3 move forward while compressing the return springs 10 and 11, and move forward. Also, hydraulic pressures are generated in the rear hydraulic chambers 4 and 5, and these hydraulic pressures are transmitted to the corresponding brake hydraulic circuits so that the wheel brakes are braked. Thus, at the initial stage of starting the braking operation of both pistons 2 and 3, a part of the hydraulic oil in both hydraulic chambers 4 and 5 is relieved due to pressurization until both pistons 2 and 3 pass through relief ports 17 and 23. It is vigorously returned from the ports 17 and 23 to the corresponding oil sump chambers 42 and 43.

When the forward pushing force to the piston rod 18 is released, both pistons 2 and 3 return springs 10,
The spring force of 11 causes it to retreat, and the pressure in both hydraulic chambers 4 and 5 is reduced. At this time, the hydraulic oil in the reservoir R is the supply port 1
6, 22, replenishment oil chambers 15, 21, communication holes 12 ..., 19 ...
The hydraulic oil is supplied to the hydraulic chambers 4 and 5 through the cup seals 13 and 20, and the excessive supply of the hydraulic oil is vigorously sent to the oil reservoirs 42 and 43 when the relief ports 17 and 23 are opened. Will be returned.

By the way, the brake hydraulic circuit connected to the front hydraulic chamber 4 is damaged, and the hydraulic oil leaks out.
Assume that hydraulic oil is stored only in No. 3. In this case, in the initial braking operation of the master cylinder M and when the rear piston 3 is retracted, the excess amount of hydraulic oil from the rear hydraulic chamber 5 is transferred from the rear oil guide pipe 36 to the rear oil reservoir 4 as described above.
Even if the jetted working oil collides with the ceiling wall 29a facing the inner end opening of the rear oil guide pipe 36 and scatters, the ceiling wall 2 between the rear oil pipe 36 and the partition wall 44 is ejected.
A projecting wall 57 projecting downward from 9a is provided in the upper half body 25, and droplets caused by a collision with the ceiling wall 29a are separated from the partition wall 4.
Since the projection wall 57 prevents the droplets from splashing to the fourth side, the splashes are prevented from splashing over the partition wall 44 toward the front oil sump chamber 42 side, and a predetermined amount of operation is performed in the rear oil sump chamber 43. Can secure oil.

If the brake hydraulic circuit connected to the rear hydraulic chamber 5 is damaged and the hydraulic oil leaks out, and the hydraulic oil is stored only in the front oil reservoir 42, the master cylinder M
At the beginning of braking operation and when the rear piston 3 moves backward,
Excessive amount of hydraulic oil from the front hydraulic chamber 4 is jetted from the front oil guide pipe 35 into the front oil reservoir chamber 42, but the oil supply cylinder 30 is arranged above the front oil reservoir chamber 42 and the partition wall is provided. 44 is arranged below the continuous portion of the ceiling wall 29a of the oil supply cylinder 30, and the hydraulic oil jetted upward from the front oil pipe 35 does not collide with the ceiling wall 29a and falls directly to the front oil reservoir. Since it returns to the chamber 42, the hydraulic oil does not move to the rear oil reservoir chamber 43 side.

Further, the projecting wall 57 is provided with openings 58, 58 having the ceiling wall 29a as an upper edge, and air is allowed to flow through these openings 58, 58 so that the projecting wall 57 collects air. Can be prevented.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.

For example, in the case where the inner end opening of the front oil guide pipe is exposed to face the ceiling wall, a projecting wall may be provided in the upper half between the inner end opening of the front oil guide pipe and the partition wall. When the inner end openings of the front oil guide pipe and the rear oil guide pipe face the ceiling wall, projecting walls located between the inner end openings of both oil guide pipes and the partition walls are provided in the upper half body. It should be done.

[0035]

As described above, according to the first aspect of the present invention, the upper half body is located at the intermediate position between the oil guide pipe having the inner end opening facing the ceiling wall and the partition wall, and Since the protruding wall protruding downward is provided between both sides of the oil reservoir,
It is possible to prevent splashes of the hydraulic oil jetted from the oil guide pipe from colliding with the ceiling wall from passing over the partition wall.

According to the invention of claim 2, in addition to the structure of the invention of claim 1, since the projecting wall is provided with an opening having the ceiling wall as an upper end edge, the air generated by the projecting wall is provided. It is possible to prevent the accumulation.

[Brief description of drawings]

FIG. 1 is a plan view of a reservoir and a master cylinder and is a view taken in the direction of arrow 1 in FIG.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylinder body 17,23 ... Relief port 24 ... Reservoir main body 25 ... Upper half body 26 ... Lower half body 29 ... Oil reservoir 29a ... Ceiling wall 35, 36 ... Oil guide pipes 42, 43 ... Oil reservoir 44 ... Partition wall 57 ... Projection wall 58 ... Opening M ... Master cylinder R ... Reservoir

Claims (2)

[Claims] 1. An upper half (25) and a lower half (2).
6) is welded to each other, and a reservoir body (24) made of synthetic resin, which is joined to the cylinder body (1) of the tandem master cylinder (M), is provided with a part of the upper half body (25) on the ceiling wall. (29a) is formed in the oil reservoir (29), and a pair of guides are provided in the lower half (26) through the pair of front and rear relief ports (17, 23) provided in the cylinder body (1). The inner ends of the oil pipes (35, 36) have at least one of the inner ends thereof the ceiling wall (2
9a) and is opened at the bottom of the oil sump (29),
The inside of the oil reservoir (29) is divided into a pair of oil reservoirs (42, 43) that individually communicate with both oil guide pipes (35, 36) by a partition wall (44) provided in the lower half body (26). In the reservoir, the upper half body (25) is located below the ceiling wall (29a) at an intermediate position between the oil guide pipe (36) and the partition wall (44) whose inner end opening faces the ceiling wall (29a). A reservoir characterized in that a projecting wall (57) projecting to the inside is provided between both sides of the oil sump (29). 2. The ceiling wall (29) is attached to the projecting wall (57).
2. Reservoir according to claim 1, characterized in that it is provided with an opening (58) whose upper edge is a).