JPS5851652Y2 - Reservoir for tandem master cylinder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reservoir installed in a so-called tandem master cylinder that independently supplies pressure oil to two systems of brake devices.

When this type of reservoir is installed in the tandem master cylinder, it is long along the axial direction and has a nearly rectangular horizontal cross section, so when it is installed in the tandem master cylinder and mounted on the vehicle, Sudden starts and stops can cause the oil to become uneven inside the reservoir, and the tilt of the vehicle can cause the oil level to become slanted, causing malfunctions in the fluid level warning device, which is located biased to one side of the reservoir.

An object of the present invention is to provide a reservoir for a tandem master cylinder that prevents the above-mentioned situation as much as possible.

According to the present invention, the object is to form a chamber in the reservoir body that is divided into two in the longitudinal direction of the vehicle when the reservoir body is attached to the tandem master cylinder, and to form a chamber in the reservoir body that is divided into two in the longitudinal direction of the vehicle. A separation wall is provided in the reservoir body to form a relatively narrow interconnected corridor in the body, and the flow of oil between the two divided chambers via the corridor is conducted from the bottom wall of the reservoir body. A liquid level warning device storage chamber separated from the bisected chamber and the corridor is provided between a wall portion integrally formed with the separation wall and the bisected chamber in order to prevent the liquid level warning device from reaching a predetermined height. A wall for forming a storage chamber integrally extended from the separation chamber to be formed together with the separation chamber, and a wall for communicating between one of the two divided chambers and the liquid level alarm device storage chamber, A narrow communication hole is formed in the wall for forming the storage chamber so as to extend vertically and be inclined, and a narrow communication hole is formed in the wall for forming the storage chamber, and a narrow communication hole is formed in the wall for forming the storage chamber. This is accomplished by a tandem master cylinder reservoir consisting of a buffer located near the open end of a corridor opening into the chamber.

This will be explained below based on a specific example.

The reservoir body 1 has two spigots 2, 2 in the longitudinal direction of its lower wall 1b, which are attached to the tandem master cylinder 3 and supply oil to the tandem master cylinder 3.

There are various structures for attaching the reservoir to the tandem master cylinder, and any of these structures may be used.

The upper wall 1a of the reservoir body 1 is provided with an oil supply port 4 and a liquid level warning device mounting port 5, the former of which is always covered with a cap 6.

A liquid level warning device 10 consisting of a float 8 containing a magnet 7 and a reed switch 9 is attached to the latter.

Inside the reservoir body 1, when the reservoir 1 is attached to the tandem master cylinder 3, a separation wall 11 is formed which defines the front and rear chambers A and B along the axial direction. A.

B communicate with each other through an opening 12.

As is clear from FIG. 1, this opening 12 is located above the lower wall 1b by a distance H and forms a mutual chamber A.

When the height of the oil contained in the reservoir body 1 does not reach H from the lower wall 1b surface, the oil in each chamber A and B flows to the other chamber. do not.

If this height H is set as the minimum allowable height of the oil stored in the reservoir body 1, when the oil drops to this height,
The liquid level alarm device 10 is activated to issue an alarm and provide a guideline for replenishing the reservoir body 1 with oil.

At the same time, this wall portion 12a of height H serves as a weir for both chambers A and B, and the problem is that the oil liquid is biased toward one chamber, and two independent systems are connected from each chamber to the tandem master cylinder. This enables the supply of oil and liquid.

As shown in FIG. 2, the separation wall 11 partially extends to the rear of the room B side, and forms a narrow corridor 13 between it and the reservoir wall 1C.
They are arranged so as to form a

When formed in this way, the flow resistance of the oil liquid in the corridor 13 becomes large, and sudden fluctuations in the oil liquid level at the time of a sudden start or sudden stop can be prevented as much as possible.

In addition, in order to deal with sudden changes in the oil level, as will be explained later,
The liquid level alarm device is installed in storage chamber 1, which is independent from the two chambers A and B.
This can also be done by housing it in 4.

In addition, as shown in phantom lines in FIG.
It may be provided as an extension of the straight portion 11a of the first straight portion 11a.

Reference numeral 15 denotes a buffer that further increases the resistance of the oil flowing through the corridor 13, and the buffer 15 is provided upright from the lower wall 1b of the reservoir body 1 near the opening end of the corridor 13 that opens to the chamber A. .

An arc-shaped wall 16 connected to the linear portion 11a of the separation wall 11 extends from the upper wall 1a to each surface of the lower wall 1b, and the storage chamber 14 is formed inside the arc-shaped wall 16.

Both are formed so that the above-mentioned liquid level warning device attachment port 5 is located approximately in the center of this storage chamber 14, and the liquid level warning device 10 is accommodated in this storage chamber 14.

A plurality of narrow communication holes 17 are bored in the wall 16, and the communication holes 1
The chambers A and B are communicated with the storage chamber 14 via the chamber 7.

The communication hole 17 is provided at least below the wall 16, and extends vertically and has an inclined direction.

In other words, this type of reservoir is generally constructed by separately molding an upper mold and a lower mold with the center surface 18 as a boundary and bonding them together at the center surface 18, so that the communication hole 17 extends vertically. If it is tilted, holes can be made with a drill, and it is also easier to use a combination core during molding.

Further, since the length of the communicating hole 17 becomes large, the flow resistance becomes large and it becomes difficult to be affected by sudden changes in the oil level.

The cross-sectional area of the communication hole 17 is the same as that of the storage chamber 14 when injecting oil.
The size is such that air can be removed smoothly, and the flow of oil can be restricted when the liquid level changes rapidly due to sudden starts or stops.

When the communication hole 17 is provided only below the wall 16, a hole is made above the wall 16 or the separation wall 11 to allow as much air as possible to circulate. It is formed to prevent the inside of the storage chamber from becoming negative pressure when gas and liquid are replaced or oil and liquid flow out into the mask cylinder.

When the reservoir of the present invention configured as described above is assembled into a tandem master cylinder and put into use, the liquid level warning device is housed in the storage chamber that communicates with the outside chamber only through the communication hole, so that the vehicle Even if the oil level in the reservoir fluctuates in a quadratic curve due to a sudden start or sudden stop,
is hardly affected by this, and no malfunctions occur.

Moreover, since the inside of the reservoir has chambers that communicate with each other above a predetermined height, even if the oil level drops below this height, the supply of oil to two independent systems can be ensured. becomes.

That is, in the tandem master cylinder reservoir of the present invention, the chamber is divided into two in the longitudinal direction of the vehicle and the liquid level warning device storage chamber is separated from the corridor. Since it is formed by an integrally extending storage chamber forming wall, it is possible to reduce fluctuations in the liquid level in the liquid level warning device storage chamber when the vehicle is tilted in the longitudinal direction. Malfunctions of the liquid level warning device can be avoided as much as possible.

Moreover, in the reservoir of the present invention, in order to communicate between one of the two divided chambers and the liquid level alarm device storage chamber, the communication path formed in the wall for forming the storage chamber is narrow, extends vertically, and is inclined. In addition, a buffer that provides resistance to the flow of oil between the bisected chamber and the corridor is provided near the open end of the corridor that opens to the bisected chamber. When the vehicle suddenly starts, suddenly stops, or momentarily tilts in the longitudinal direction, on the one hand, it is possible to prevent sudden movement of oil between the liquid level warning device storage chamber and the one chamber, and on the other hand, the chamber is divided into two. As a result, fluctuations in the liquid level in the liquid level warning device housing chamber during sudden starts, sudden stops, and instantaneous inclinations can be reduced, and the liquid level Erroneous activation of alarm devices can be substantially eliminated.

In other words, according to the present invention, the liquid level warning device can be prevented from erroneously in any of the following cases: sudden start or stop of the vehicle, rocking in the longitudinal direction when the vehicle is running, or tilting in the longitudinal direction when the vehicle is stopped. It can almost eliminate the operation.

Moreover, in the reservoir of the present invention in which the narrow communication path formed in the wall for forming the storage chamber extends vertically and is inclined,
Since the length of the communicating path can be made substantially longer, the resistance to the oil liquid can be increased, and the above-mentioned effects can be further ensured, and in order to obtain these effects, the communicating path can be formed in the wall for forming the storage chamber. When drilling, it can be easily done with a drill or the like, and the molding of the reservoir using the combination core can be simplified.

[Brief explanation of drawings]

Figure 1 is a sectional view of the reservoir of the present invention, and Figure 2 is the same as in Figure 1.
It is a sectional view taken along the line -■. DESCRIPTION OF SYMBOLS 1... Reservoir main body, 1a... Upper wall, 1b... Lower wall, 10... Liquid level warning device, 11... Separation wall, 12
...Opening, 14...Accommodation chamber, 17...Communication hole, A
,B...front and rear chambers.

Claims (1)

[Scope of utility model registration request] When attaching the reservoir body to the tandem master cylinder, a chamber divided into two in the longitudinal direction of the vehicle is formed within the reservoir body, and a relatively narrow corridor is formed within the body to communicate the two divided chambers with each other. a separation wall provided in the reservoir body to form a partition, and a separation wall provided in the reservoir body to prevent oil fluid from flowing between the two divided chambers via the corridor up to a predetermined height from the bottom wall of the reservoir body. between the wall portion integrally formed with the partition wall and the bisected chamber, to form a liquid level alarm device housing chamber separated from the bisected chamber and the corridor together with the partition wall. In order to communicate the integrally extended storage chamber forming wall with one of the two divided chambers and the liquid level alarm device storage chamber, a vertical wall is provided on the storage chamber forming wall. a narrow communicating hole that is elongated and formed at an angle; and a corridor opening that opens into the bisected chamber to provide resistance to the flow of oil between the bisected chamber and the corridor. A reservoir for a tandem master cylinder consisting of a tube located near the end.