JPH0225731Y2 - - Google Patents

Description

[Detailed description of the invention] [Subject of the invention] The invention relates to the improvement of a master cylinder made of a resin material. Specifically, in order to increase the degree of freedom in the direction of piping, a union is attached to the outlet boss part. This invention relates to an improvement in the seal structure of a master cylinder.

[Application field of this invention]

The present invention is used as a master cylinder that generates hydraulic pressure in response to pedal force and operates a brake device or a clutch release device in automobiles, industrial vehicles, etc.

[Prior art]

The master cylinder, which was conventionally made of a metal material, is now made of a resin material in order to reduce its weight, as disclosed in U.S. Pat. There are things that can be done. As shown in FIGS. 1 and 2, this cylinder has a main cylinder body 10 made of a resin material, a reservoir part 12 whose opening is covered with a rubber cap 11, and a cylinder part 13. It integrally has a mounting flange portion 14. 15 is an actuation rod, and this rod 15 is connected to cylinder 1.
The hydraulic piston in 3 and the pedal are mechanically connected. 16 is an outlet boss portion of the hydraulic master cylinder, and an outlet port 17 is provided within this boss portion. A metal insert 18 is integrally buried in the entrance portion of the outlet port 17. This insert 18 has a female thread 18a into which a male thread 21a of a metal nut 21 at the end of the metal pipe 19 threadably engages. A metal union sheet 25 is provided at the back of the port 17 via a seal ring 27, and the flared end 19a of the pipe 19 is pressed against this sheet 25 by tightening the nut 21.

[Problems with the prior art and their technical analysis] This conventional master cylinder has an insert 18
Since the direction of the pipe 19 whose flared end 19a is pressed against the seat 25 by the nut 21 screwed into the seat 25 is constant, the pipe 19 may interfere with other equipment within the limited space of the vehicle. Alternatively, there is a problem that piping becomes difficult. Therefore, in order to solve this problem, the outlet boss portion 16
It is conceivable to arrange a union that can be attached freely in any direction between the end face of the nut 21 and the head of the nut 21, and to connect the pipe to the union. One way to do this is to hold the union by pressing it against the end surface of the outlet boss 16 by tightening the nut 21 screwed into the insert 18. It is necessary to form a through fluid passageway to the union.
Therefore, since the fluid is communicated with the inside of the union held between the end face of the outlet boss part and the head of the nut through the through fluid passage formed in the nut, the end face of the outlet boss part and Requires a sealing member to seal between the union and a sealing member to seal between the union and the nut head,
Furthermore, since a seal is required between the outlet boss portion and the insert, a total of three sealing members are required.

[Technical issues]

Therefore, the present invention aims to reduce the number of sealing members by using a single sealing member to perform the sealing function between the resin body and the insert and the sealing function between the end face of the outlet boss and the union. Take it as a challenge.

[Technical means]

The technical means taken to solve the above technical problem includes a union disposed adjacent to the outer end surface of each of the outlet boss part and the metal insert embedded integrally inside the boss part; A union bolt, which penetrates the union to hold the union and whose tip end is screwed into the insert and forms a fluid passage, is disposed between the end face of the outlet boss part and the union, and is connected to the outlet boss part. A first elastic seal member that seals between the inserts and between the outlet boss end face and the union, and a second seal that is arranged between the bolt and the union in close proximity to the bolt head and seals between the union and the bolt head. It has a member.

[Effect of technical means]

The above technical means works as follows.

Since the first elastic seal member is disposed between the union and the outlet boss end face having the insert embedded integrally therein,
It has a sealing function between the outlet boss end face and the union, and can also achieve a sealing function between the outlet boss and the insert.

[Special effects produced by the present invention]

In the above-mentioned present invention, a union is disposed adjacent to each end face of an outlet boss portion and a metal insert embedded integrally inside the boss portion, and a first elastic member is provided with a union. Since the elastic sealing member is arranged between the end face of the outlet boss and the union, when the union is held on the end face of the outlet boss by tightening the union bolt, the union comes into contact with the end face of the insert. Since the sealing function can be ensured by the tightness of the first elastic seal member, it is substantially separated from the end face of the outlet boss made of resin (the gap between the union and the end face of the outlet boss is zero or extremely small). Therefore, when holding the union with the union bolt, there is no need to apply excessive tightening torque to the end face of the resin outlet part, and there is no risk of the resin part being destroyed. There is.

〔Example〕

An example illustrating a specific example of the above technical means will be described below.

FIG. 3 shows an outlet boss portion 16 formed integrally with the resin main body 13 of the master cylinder according to the present invention.
A cylindrical metal insert 18 is integrally embedded in the insert 18, and a through fluid passage 20a is provided in the insert 18.
The tips of the union bolts 20 having a hole therein are screwed together, thereby creating a port 30a connecting the passage 20a between the respective end surfaces of the insert 18 and the outlet boss portion 16 and the head 20b of the union bolt 20. A rotatable metal union 30 is interposed therebetween. A groove 31 is formed between the end surfaces of the outlet boss 16 and the insert 18 and the union 30, and a groove 31 is formed in the edge of the insert 18 and the outlet boss 16. An elastic sealing member 32 made of a ring is provided. Further, a groove 33 is formed in a portion of the union 30 close to the head 20b of the union bolt 20, and a rubber O
A sealing member 34 made of a ring is provided.

When the union bolt 20 is screwed into the insert 18, the seal member 32 has sufficient tightness and elasticity, so the union 30 abuts against the right end surface of the insert 18, but the outlet boss portion 1
A sufficient sealing function can be achieved even when there is no substantial contact with the right end surface of 6 (the gap therebetween is zero or extremely small).

The seal member 32 is attached to the outlet boss portion 1.
6 and insert 18 and passageway 20
The sealing member 34 has the function of sealing both the fluid that is about to leak to the outside from the passage 20a through between the bolt 20 and the union 30, and It has the function of sealing off fluid that tends to leak to the outside.

In the above, the groove 31 in which the seal member 32 is accommodated is located between the outlet boss portion 16 and the insert 1.
8, but may be formed only at the outlet boss portion 16.

Another embodiment of the present invention is shown in FIG. 4, which differs from the embodiment of FIG. 3 in that a groove 35 for a seal member 32 is formed in the union 30. Other than that, the configuration is similar to that of the previous embodiment, so detailed explanation will be omitted.

In the embodiment of the present invention described above, the single sealing member 32 can perform the sealing function between the resin main body 13 and the insert 18 and the sealing function between the end face of the outlet boss portion 16 and the union 30. The number of seal members can be reduced.
Further, in the embodiment of the present invention, the sealing member 34
Since the concave groove 33 is formed in the union 30 instead of the union bolt 20, the shape of the union bolt 20 is simple, and furthermore, the concave grooves 31 and 33 are provided with seal members 32 and 34 made of O-rings. Since the structure is such that the outlet boss portion 16 and the insert 18 are arranged in the respective end faces and the union 30 and the union bolt 20
Compared to the case where a gasket seal is provided between the head 20b of the union bolt 20 and the union 30, the distance from the end face of the outlet boss 16 to the tip of the head 20b of the union bolt 20 is reduced by the thickness of these gaskets. This allows the master cylinder to be made smaller.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the resin master cylinder, Figure 2 is a schematic diagram of the resin master cylinder.
The figure is a sectional view of the conventional outlet boss section taken along the - line in Fig. 1, Fig. 3 is a sectional view of the outlet boss section according to the present invention taken along the - line in Fig. 1, and Fig. 4 is a sectional view of the outlet boss section according to the present invention taken along the - line in Fig. FIG. 3 is a sectional view showing another embodiment of the present invention. 13...Main body, 16...Outlet boss section,
18...insert, 20...union bolt,
20a...passage (fluid passage), 20b...head,
30...Union, 31, 33, 35...Concave groove,
32... Seal member (first elastic seal member), 3
4... Seal member (second seal member).

Claims (1)

[Scope of utility model registration request] An outlet boss portion integrally formed on a main body formed of a resin material, a metal insert integrally buried within the outlet boss portion, and an outer end surface of each of the outlet boss portion and the metal insert. a union disposed adjacent to each other, a union bolt that passes through the union to hold the union and whose tip end is screwed into the insert and forms a fluid passage; an end surface of the outlet boss portion and the union; a first elastic seal member disposed between the outlet boss portion and the insert and sealing between the end face of the outlet boss portion and the union; and a first elastic seal member disposed between the bolt and the union in close proximity to the head of the bolt. a second seal for sealing between the union and the bolt head;
A master cylinder including a seal member.