JPS631638Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a master cylinder used in a brake or clutch device of a vehicle or the like.

Conventionally, when attaching a master cylinder to a vehicle body, the master cylinder is provided with a flange, and this flange is attached to a toe board or a fixed portion of the vehicle body using bolts and nuts.

For this reason, the need to form a flange on the master cylinder increases the weight, and since it is usually fixed using two or more sets of bolts and nuts, the efficiency of the fixing work is poor, resulting in a decrease in production efficiency. There's a problem.

The present invention was made in view of these problems, and aims to provide a master cylinder mounting structure that can improve production efficiency. A groove is formed on the other side in the radial direction opposite to the groove, and a hole large enough to allow the end of the master cylinder to pass through is formed in the mounting part provided on the vehicle body, and the inner circumferential portion of this hole is formed. one of the grooves on the one side and the other side forms a support part that fits in the radial direction, and the other of the grooves on the one side and the other side forms a second support part that fits in the radial direction. An auxiliary plate is provided at one end and at the other end with a portion for fixing to the mounting portion of the vehicle body.

That is, according to the present invention, after the end of the master cylinder passes through the hole in the vehicle body, one groove is fitted into the support part of the hole, and the second support part is fitted into the other groove in advance. Or, an auxiliary plate with one groove fitted into the support part of the hole and a second support part fitted into the other groove, can be attached to the vehicle body using the fixed part formed on the auxiliary plate. By fixing it to the mounting part, the entire master cylinder can be mounted on the vehicle body, and the following effects can be obtained.

Since the master cylinder can be fixed by directly fitting one of the grooves formed at the end of the master cylinder into the vehicle body and fitting the other groove to the auxiliary plate, it is possible to install the master cylinder with a large flange-like protrusion. Since there is no need to form a portion and only a groove is formed, the shape of the master cylinder can be made smaller and manufacturing becomes easier.

The mounting plate does not need to be installed around the entire circumference of the master cylinder, but can be installed on one side of the master cylinder, so it is small and lightweight, and it only needs to be fixed to the mounting part of the car body in one place. often,
Improve work efficiency by reducing the number of fixtures. ” The master cylinder has a groove on one side and a groove on the opposite side in the radial direction, and is supported by an auxiliary plate and a support portion that fit into these grooves, so the support is stable and has sufficient It can be attached to the vehicle body with sufficient strength.

Hereinafter, the master cylinder of the present invention will be explained in detail based on illustrated examples.

FIG. 1 is a side sectional view of a center valve type single master cylinder for a clutch which is an embodiment of the present invention, FIG. 2 is a side view of only the second member shown in FIG. 1, and FIG. FIG. 4 is a partial side view of only the cylinder body shown in FIG. 1, and FIG. 4 is a front view, partially in section, showing the relationship between the cylinder body and the auxiliary plate shown in FIG.

In the figure, the master cylinder is 1
The cylinder body 3 has an internal cavity that communicates with the inside of the cylinder hole 2 through a stepped hole 4 provided at the bottom of the cylinder hole 2. A liquid reservoir 6 with a reservoir 5 is integrally provided.

A piston 7 is slidably inserted into the cylinder hole 2, and defines a pressure chamber 8 between the piston 7 and the bottom of the cylinder hole 2. The piston 7 is a joint structure of a first member 9 located on the right side and a second member 10 located on the left side, and the first member 9 is made of a high-strength synthetic resin material. 10 are each made of a synthetic resin material with relatively low strength. The first member 9 includes a shaft portion 12 with a recess 11 formed relatively long in the axial direction, and a disk portion 13 formed integrally with the shaft portion 12 and whose outer periphery slides on the inner peripheral surface of the cylinder hole 2. A push rod 14 can come into contact with the recess at the left end of the disc part 13, and a lip seal 15 for high pressure sealing is supported by the disc part 13 on the outer periphery of the shaft part 12 and is connected to the left end of the push rod 14. It is mounted so that the bottom of the recess 11 lies on two planes in the radial direction. That is, the disc part 1
The first member 9 is formed such that the left end surface of the first member 3 and the lowest part of the recess 11 are on the same plane in the radial direction.
Further, as is clear from FIG. 2, the second member 10 has a substantially cup-like shape, and
An inner hole 16 is formed therein, and a notch 17 is formed over the entire length in the axial direction. The left end of the cutout 17 communicates with the hole 18 formed in the center, and a stepped enlarged portion 19 is formed on the left side. Furthermore,
A flange portion 20 that is slidable on the inner peripheral surface of the cylinder hole 2 is formed on the outer periphery of the intermediate portion of the second member 10 . These first member 9 and second member 10 are integrated by fitting them together and then press-fitting a pin 23 across a hole 21 and a recess 22 formed in both. .

A return spring 25 whose right end is supported by the flange portion 20 and whose left end is supported by the bottom of the cylinder hole 2 via a spring receiver 24 is stretched between the piston 7 and the bottom of the cylinder hole 2. 7
to the cylinder body 3 via the push rod 14.
It is biased to a non-operating position where it comes into contact with a stopper 26 attached to the end.

A valve rod 27 is disposed extending through the spring receiver 24 in the axial direction. A head 28 is formed at the right end of the valve stem 27, and before the first member 9 and the second member 10 are connected, the head 28 is inserted into the second member 10 through the aforementioned enlarged portion 19. The head 28 is inserted into the hole 16 so that the head 28 can engage with the second member 10 via a C-shaped protection plate 29 that is inserted into the inner hole 16 in advance. Further, a center valve 30 is integrally provided at the left end of the valve stem 27, and this center valve 30 is connected to the stepped hole 4 together with the valve stem 27 by a low tension valve spring 31 stretched between the spring receiver 24. It is urged toward a seat 32 formed on the stepped portion.

A bulge 33 is formed on the outer periphery of the right end of the cylinder body 3, and this bulge 33 has third and fourth bulges.
As is clear from the figure, a groove 34 is formed and the groove 3
4, a pair of claws 35, 36 on the left and right in FIG.
is formed.

A substantially C-shaped support part 38 of the auxiliary plate 37 can be fitted into the upper side of the groove 34 with almost no gap, and the claws 39 and 40 formed at the lower end of the support part 38 are connected to the above-mentioned claws 35 and 34. It is now possible to engage with Although the auxiliary plate 37 is made of metal, its lower end can be slightly elastically deformed, and can be fitted into the groove 34 in combination with the elastic deformation of the cylinder body 3. Further, an elongated hole 42 is formed in the upper part of the auxiliary plate 37, through which the shaft portion of the bolt 41 can pass.

On the other hand, the toe board 43 is formed with a hole 44 into which the bulging portion 33 of the cylinder body 3 can be loosely fitted, and the inner peripheral edge of the lower half of the hole 44 is connected to the auxiliary plate 37.
The support portion 45 is fitted into the remaining groove portion of the support portion 38 fitted into the groove 34 with almost no gap.
Further, the upper half of the hole 44 and a part of the toe board 43 following the hole 44 form a second support portion 46 recessed in a shape similar to that of the auxiliary plate 37 . A bolt 41 is welded to the second support portion 46, and the auxiliary plate 37 is attached to the toe board 43 by this bolt 41 and a nut 47 screwed onto the bolt 41.
is fixed to.

In addition, in FIG. 1, reference numeral 48 indicates a groove-shaped notch provided at the upper part of the stepped hole 4, 49 indicates a boot, and the pressure chamber 8 is connected to the pressure of the clutch operating cylinder through a hole (not shown). I am contacting the room.

Regarding the above example, first, the procedure for attaching the master cylinder 1 to the toe board 43 will be described.

First, the master cylinder 1 incorporating members such as the piston 7 is loosely fitted into the hole 44, and then the toe board 43 is inserted into the toe board 43.
The support portion 45 of is fitted into the groove 34. Thereafter, the support portion 38 of the auxiliary plate 37 is fitted into the groove 34 while the shaft portion of the bolt 41 is loosely fitted into the elongated hole 42 of the auxiliary plate 37. At this time, the auxiliary plate 37 is press-fitted while slightly elastically deforming the cylinder body 3 into a downward-sloping state to the right in FIG.

When the press fitting of the auxiliary plate 37 into the groove 34 is completed, the nut 47 is fitted onto the bolt 41, and the fixing work is completed.

The operation of the master cylinder 1 fixed in this manner will be described below.

Assuming that the pedal (not shown) is not depressed now, each member is in the position shown.

That is, the piston 7 comes into contact with the stopper 26 via the push rod 14 due to the biasing force of the return spring 25, and the valve rod 27 engages with the piston 7 and moves against the seat 32.
The pressure chamber 8 communicates with the internal space 5 and is relieved of pressure.

In this state, the pedal is depressed to move the piston 7 to the left against the tension of the return spring 25. Then, the valve stem 27 moves to the left by the tension of the valve spring 31, and the center valve 30 seats on the seat 32, sealing the pressure chamber 8. Next, when the piston 7 moves further to the left, higher pressure is generated within the pressure chamber 8.

In this series of operations, the cylinder body 3 receives a biasing force to the left in FIG. and acts on the second support part 46 via the auxiliary plate 37,
After all, the cylinder body 3 is supported by the toe board 43.

Therefore, according to the above embodiment, the following effects are achieved.

The cylinder body 3 includes a support portion 45 of a toe board 43 and an auxiliary plate 3 fixed to the toe board 43.
7, there is no need to provide a flange, and only the grooved bulge 33 needs to be provided, and the auxiliary plate 37 can also be smaller than the conventional flange. It is possible to reduce the weight from

Since only one set of bolts and nuts is needed to fix the auxiliary plate 37, it is possible to further reduce the weight, and the installation work can be carried out efficiently, improving production efficiency.

Since the mounting plate 37 has a pair of claws 39 and 40 that engage a pair of claws 35 and 36 in the groove 33, the mounting plate 37 can be securely mounted to the cylinder body 3 by being prevented from slipping out and rotating. become.

Since the second support portion 46 is recessed in a similar shape to the auxiliary plate 37, movement of the auxiliary plate 37 in the vertical and horizontal directions in FIG. 4 is prevented, and the mounting state of the master cylinder 1 is stabilized. Also, even if
Even if the auxiliary plate 37 moves upward in FIG. 1, the supporting parts 38 and 45 do not fall out of the grooves 33, so that the attached state is more stable.

As is clear from the above, according to the example,
Although various effects have been achieved, the present invention can be implemented without being limited to the illustrated example.

That is, in order to facilitate press-fitting of the auxiliary plate 37 into the groove 34, a third
As shown by the broken line in the figure, an example in which a tapered portion is formed and the thickness is reduced, an example in which the auxiliary plate 37 is press-fitted into the groove 34 in advance and then the cylinder body 3 is fitted into the hole 44 and assembled, and the cylinder body 3 is made of metal. Examples include applications to tandem master cylinders or other different types of master cylinders, examples in which another boot or a sealing member integral with the boot is provided to seal the hole 44, and examples in which a sealing member is provided that is integral with the boot or other parts of the vehicle body instead of the toe board. An example in which the master cylinder is attached to a mounting plate attached to a part of the toe board 43, an example in which the auxiliary plate 37 is provided on the opposite side of the toe board 43, etc. are cited, but various modifications other than these examples are also possible.

As is clear from the above, according to the present invention, a master cylinder mounting structure with improved production efficiency can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a center valve type single master cylinder for a clutch which is an embodiment of the present invention, FIG. 2 is a side view of only the second member shown in FIG. 1, and FIG. FIG. 4 is a partial side view of only the cylinder body shown in FIG. 1, and FIG. 4 is a front view, partially in section, showing the relationship between the cylinder body and the auxiliary plate shown in FIG. 1... Master cylinder, 3... Cylinder body,
34... Groove, 37... Auxiliary plate, 43... Toe board, 44... Hole, 45... Support part.

Claims (1)

[Scope of utility model registration request] Grooves are formed on one side of the outer periphery of the master cylinder end and on the other side radially opposite to this one side, and the mounting portion provided on the vehicle body has a groove of a size that allows the master cylinder end to pass through. A hole is formed, and a support portion is formed in the inner peripheral portion of the hole into which one of the grooves on the one side and the other side fits in the radial direction, and the other of the grooves on the one side and the other side is formed. A master cylinder mounting structure including an auxiliary plate having a second support portion fitted in the radial direction formed on one end side and a fixing portion to a mounting portion of a vehicle body formed on the other end side.