JPS638524Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tandem master cylinder used in a brake device of a vehicle or the like.

This type of master cylinder includes a cylinder body that has two liquid connections, and a synthetic resin reservoir that is attached to the cylinder body and communicates with each of the two liquid connections, and has at least one liquid connection. Liquid communication with the reservoir is performed through a cylindrical communication part extending from the main body of the reservoir, and the communication part is provided with a communication hole passing through the communication part,
Some have a blind plug inserted into the open end of the communicating hole.

However, in conventional devices, even if a blind stopper is inserted to prevent the plug from coming off, there is a problem in that the stopper is not stable over a long period of time. In other words, since the connecting part itself is molded integrally with the reservoir and is made of synthetic resin material, if the retainer is secured by a screw member screwed onto the connecting part, the part on which the tightening force of the screw member is applied will be exposed to heat. Due to influences, the screw deforms in a relatively short period of time, almost loses its tightening force, and the screw member loosens, making it impossible to prevent it from coming out completely, or the screw member itself can be used as a seal retainer, etc. If so, seal failure will occur. In addition, when fixing the connecting part to the cylinder body, if the connecting part is fixed by pressing from the upper side with a screw member that passes through the connecting part vertically, the tightening force of the screw member will be applied to the connecting part in the vertical direction. However, in such a situation, if the pressure applied during the air bleeding operation is applied to the connecting part, this pressure will also act from the lower side of the connecting part upwards, deforming the connecting part and causing damage to the connecting part itself. If the wall thickness is made thin, the total force exerted by these forces will cause a large stress to be applied to the entire structure, leading to problems such as damage.

The present invention has been made in view of the above problems, and aims to provide a tandem master cylinder that can sufficiently prevent the blind plug from being removed without any trouble. A support part that prevents movement toward the hole side, and a fixing part that is fixed to the cylinder body adjacent to the communication part, the fixation part being engaged with the lower part of the opening end side of the communication part to fix the communication part to the cylinder body. It is equipped with a presser foot that can be pressed against the main body.

The present invention, configured as described above, has the following effects.

By fixing the presser foot to the cylinder body,
It is possible to prevent the blind stopper from coming out and to fix the connecting part to the cylinder body, compared to when doing it separately.
This improves work efficiency and reduces the number of parts.

The presser foot is fixed to the cylinder body adjacent to the connecting part, and the lower part of the connecting part is pressed against the cylinder body, so it is possible to prevent deformation caused by pressing the connecting part from above, and also to prevent deformation during air bleeding work. By receiving the acting force due to the pumping pressure at the lower part of the connecting part and preventing it from being transmitted to the upper part of the connecting part, deformation of the connecting part can be prevented.

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

FIG. 1 is a side sectional view of essential parts of a tandem master cylinder that is an embodiment of the present invention.

In Fig. 1, the tandem master cylinder is
The master cylinder 1, which is indicated as a whole by 1, has a cylinder body 3 in which a cylinder hole 2 is bored, and liquid connections 4 and 5 are provided at necessary intervals on this cylinder body 3. . Recesses 6 and 7 are provided in each of the liquid connection portions 4 and 5, and these recesses 6 and 7 are connected to the inside of the cylinder hole 2 to connect supply holes 8 and 9 and loosening hole 10. , 11 are provided respectively.

A reservoir 14 provided with liquid supply parts 12 and 13 facing the liquid connection parts 4 and 5 of the cylinder body 3.
is attached to the cylinder body 3.

The reservoir 14 has a main part 16 which has a substantially cylindrical shape and has a cap 15 screwed onto it so as to cover the upper opening.
and a communication part 17 formed extending from the main part 16 along the cylinder body 3, the liquid supply part 12 is in the lower part of the main part 16, and the liquid supply part 13 is in the lower part of the end side of the communication part 17. are provided in each. Reservoir 14
Each of the liquid supply parts 12 and 13 has a cylindrical shape with inner holes 18 and 19, and is fitted into the recesses 6 and 7 of each liquid connection part 4 and 5, respectively, with sealing members 20 and 21 interposed therebetween, The reservoir 14 is fixed to the cylinder body 3 by a bolt 23 with a passage 22 screwed into the bottom of the recess 6. Note that the sealing member 21
Referring to FIG. 2, the inner circumferential portion 24 and the outer circumferential portion 2
It has a multiple ring-like shape with 5,
Further, 26 is a plate with an elongated hole 27 arranged between the bolt 23 and the bottom wall of the main portion 16.

On the other hand, the main part 1 is connected to the communication part 17 of the reservoir 14.
A through hole 28 is provided to communicate the inside of the 6 and the inner hole 19, and a blind plug 29 is fitted into the through hole 28.

This blind plug 29 is located at the third
To explain this with reference to the drawings, the main portion 31 fits into the through hole 28 with the sealing member 30 interposed therebetween, and the main portion 3
A flanged portion 32 provided at the left end of the connecting portion 17 and abutting against the left end of the connecting portion 17;
A plurality of (3 in the example) are formed extending along the outer surface of the
The blind plug 29 has legs 33 of a cylinder), and the legs 33 of the blind stopper 29 are provided with claws 34 that protrude radially inward.

Stepped portion 3 that allows the claw 34 of this blind plug 29 to engage
5 is provided on the outer periphery of the end portion of the connecting portion 17, and the left side of this stepped portion 35 is formed into a tapered portion 36 so as to decrease toward the open end side.

In the communication part between the communication part 17 and the liquid supply part 13,
A semicircular protrusion 37 is provided, and this protrusion 3
7 is pressed toward the cylinder body 3 by a presser 39 attached to the cylinder body 3 with a bolt 38.

Referring to the plan view shown in FIG. 4, the presser foot 39 has a substantially U-shape, and includes a flat plate portion 41 provided with a reinforcing rim 40 and a liquid supply portion of the cylinder body 3 provided along the outer peripheral edge of the flat plate portion 41. 5 and a support portion 43 that can come into contact with the end surface of the blind stopper 29.

In the master cylinder 1 described above, each member is assembled as follows.

That is, first, the blind plug 29 is inserted into the open end of the through hole 28 of the communication portion 17 . At this time, the leg 33 of the blind plug 29 is elastically deformed while the claw 34 slides on the tapered part 36, and when the blind plug 29 is inserted to a sufficient position, the restoring force of the leg 33 causes the leg 33 to deform. The pawl 34 engages the step 35, whereby the blind plug 29 becomes integral with the reservoir 14.

Next, each liquid supply section 12, 13 of the reservoir 14
are fitted into the recesses 6 and 7 with a sealing member interposed between them, and in this state, the bolt 23 is screwed into the bottom of the recess 6, and the presser foot 39 is placed at a predetermined position, and the bolt 38 is inserted into the cylinder body 3. to be screwed together. Then,
The reservoir 14 is substantially fixed to the cylinder body 3 by a bolt 23, and a bolt 38
As it is screwed in, the presser foot 39
The flat plate part 41 of the presser foot 39 is in contact with the protrusion 37, so that the end of the communication part 17 deforms the sealing member 21 and rotates like a lever member. When it is pressed toward the main body 3 and the lower end of the strip part 42 of the presser foot 39 comes into contact with the upper end surface of the liquid connection part 5 as a whole, the end of the communication part 17 is fixed to the cylinder main body 3 and the reservoir is closed. 14 to the cylinder body 3 is completed.

Thereafter, assembly of the master cylinder 1 is completed by assembling other necessary parts.

In the above-described embodiment, since the presser foot 39 is provided with the support portion 43 that prevents the blind plug 29 from moving in the direction of coming out of the through hole 28, the blind plug 29
The blind plug 29 can be reliably prevented from coming off, and since the blind plug 29 only needs to be inserted into the through hole 28, the work is easy.Furthermore, since the blind plug 29 is provided with legs 33 having claws 34, the master cylinder 1 can be easily removed. It can be prevented from easily coming off until the assembly is completed.

Further, the presser foot 39 forms a fixed part fixed to the cylinder body 3 by a part of the flat plate part 41 and a part of the band-shaped part 42;
Not only is it formed integrally with the support part 43, but the flat plate part 41 is U-shaped and also serves to press the communication part 17 against the cylinder body 3, so it is reliable even when installing the entire reservoir 14. sex·
This improves reliability, and allows air bleeding to be carried out reliably without any hindrance even when air is removed by pressure feeding the brake fluid, and the sealing member 21
It is also possible to reliably prevent liquid leakage.

FIG. 5 is a sectional view of a main part showing another embodiment of the present invention, but in this example, the blind stopper 29' is not provided with a leg with a claw, and the support part 43' of the presser foot 39' is
A semi-cylindrical auxiliary part 44 is provided to press the communication part 17' toward the cylinder body 3. In this example, although the shape of the presser foot 39' is slightly complicated, the end shape of the connecting portion 17' and the blind plug 2
The shape of 9' can be greatly simplified.

FIG. 6 shows still another embodiment, in which a flange 4 is attached to the outer periphery of the lower end of the liquid supply section 46 provided in the communication section 45.
7 is provided, and the reduced diameter part 49 and the collar part 47 of the liquid connection part 48 are provided.
and can be engaged with each other through a grommet seal 50, and a fixed part 52 is integrally formed in the blind plug 51, and this fixed part 52 is attached to the cylinder body 54 with a bolt 53. This is what I did. According to this example, by integrating the presser foot with the blind stopper 51, the number of parts can be reduced, and
This is a simpler version of the part shape.

Note that the present invention is not limited to the above-mentioned embodiments and can be modified, and the shape and arrangement of the presser foot are not limited to the illustrated examples, but can be modified in accordance with the shape of the master cylinder, the shape of the reservoir, etc. Can be changed.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the main parts of a tandem master cylinder that is an embodiment of the present invention, FIG. 2 is an explanatory diagram of the parts shown in FIG. 1, and FIG. FIG. 4 is an explanatory view of the parts shown in FIG. 1, and FIGS. 5 and 6 are sectional views of essential parts showing other embodiments. 1... Tandem master cylinder, 29, 29',
51... Blind plug, 41, 41'... Flat plate part, 42,
42'...Striped part, 43, 43'...Support part, 52
...Fixed part.

Claims (1)

[Scope of utility model registration request] a cylinder body forming two liquid connections;
a reservoir attached to the cylinder body and in liquid communication with each of the two liquid connection parts, and liquid communication between at least one liquid connection part and the reservoir is provided through a cylindrical communication part extending from the main body of the reservoir. and do it,
In the tandem master cylinder, the communication hole is provided with a communication hole passing through the communication hole, and a blind plug is inserted into the open end of the communication hole, and a support portion for preventing the blind plug from moving toward the open hole side. , a fixed part adjacent to the communication part and fixed to the cylinder body, and a presser foot that can engage with the lower part of the opening end of the communication part and press the communication part toward the cylinder body. Tandem master cylinder.