JPH0541100Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an inlet union for a master cylinder, such as a tandem master cylinder, used in a vehicle brake system.

B. Prior Art Conventional master cylinders of this type, such as tandem master cylinders, include those in which a reservoir is directly attached, as well as those in which a reservoir is attached to a vehicle body and connected via a hose. The latter tandem master cylinder was equipped with an inlet union having two independent conduits for supplying working fluid from a reservoir to each pressure chamber of the master cylinder via a hose.

In this inlet union, the two pipes are integrally molded by a connecting portion, and a connecting portion is formed approximately at the center of the connecting portion to protrude toward the cylinder for connecting to the cylinder, It was screwed onto the master cylinder side with a stepped mounting screw through a mounting hole provided in this coupling portion.

Since the inlet union is usually molded from a resin material such as nylon, the large diameter side shaft diameter of the stepped mounting screw is smaller than the mounting hole;
The length used was longer than the thickness of the joint of the inlet union. (Jitsukai 58-
No. 152452) c Problems to be solved by the invention However, after the inlet union is connected based on the gaps between the mounting hole and the stepped mounting screw in the connection part of the inlet union and between the connection part and the master cylinder. There is a large amount of play, and as a result, vibrations are likely to occur while the vehicle is running, which poses a problem in that the stepped mounting screws may fall off, which may impede the vibration resistance and durability of the master cylinder.

Further, in addition to manufacturing the stepped mounting screw and machining the screws on the master cylinder side, the assembly work of the inlet union and the master cylinder becomes complicated, resulting in an increase in manufacturing cost.

The present invention was devised in view of these points, and its purpose is to solve the above problems, eliminate play after the inlet union is connected to the master cylinder, simplify the processing for the connection, and An object of the present invention is to provide an inlet union for a master cylinder that facilitates the overall assembly work.

d Means for Solving the Problems The configuration of the present invention for achieving the above object is such that a plurality of sets of pistons and pressure chambers are connected to a master cylinder arranged vertically, and each pressure chamber is actuated from a reservoir. In an inlet union having a plurality of independent pipes for supplying fluid, the plurality of pipes are integrally molded by a connecting part, and a part of the coupling pin described below is fixed to the side thereof. When a union member is formed with an engaging portion and a connecting portion having an insertion hole for connecting to the master cylinder from approximately the center of the connecting portion, and the master cylinder is connected, one pin portion of the union member is formed. However, by fitting the insertion hole of the joint part in the front union member and the insertion hole provided on the cylinder side,
The union member is characterized by comprising a substantially L-shaped coupling pin, the other pin portion of which is fixed to the coupling portion of the union member.

e Effect Since the present invention is configured as described above, the union member is configured such that each of the plurality of pipes integrally formed by the connecting portion is fitted into the working fluid supply port of the master cylinder, and the union member is connected to the working fluid supply port of the master cylinder. The parts are connected to the master cylinder without a gap by one pin part of a substantially L-shaped connecting pin that is inserted into the insertion hole provided in both parts.

After the coupling, the other pin portion of the coupling pin is engaged with an engagement portion of a retaining structure formed on a side of the coupling portion of the union member. Due to this engaging portion, the coupling pin can be easily removed from the engaging portion and will not fall off. Moreover, the structure allows the coupling pin to be engaged with the engagement portion extremely easily.

f. Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

Fig. 1 is a plan view of an inlet union for a master cylinder showing one embodiment of the present invention, and Fig. 2 is a plan view of an inlet union for a master cylinder showing an embodiment of the present invention.
FIG. 3 is a partial cross-sectional view taken along the line - in the figure, and FIG. 3 is a perspective view of the main part.

In the figure, reference numeral 1 denotes a tandem master cylinder in which two sets of pistons and pressure chambers are arranged vertically (in the cylinder axis direction). Hydraulic fluid supply ports 3 and 4 for supplying hydraulic fluid are formed.

The union part 10 is molded from a resin material such as nylon, and the two pipe lines 11 and 12 for supplying the hydraulic fluid are connected to the connecting part 1.
It is integrally molded by 3. At the same time, fitting portions 11a and 12a at one ends of the pipes 11 and 12 are fitted into the hydraulic fluid supply ports 3 and 4 of the master cylinder 1 via annular seal members 5 and 6, respectively.
(12a: not shown) and two coupling parts 14a and 14b for coupling the union part 10 to the master cylinder 1 are integrally molded together with the coupling part 13 (more specifically, the coupling parts 13a and 13b). ing. The other ends 11b, 1 of the pipe lines 11, 12
Reference numeral 2b denotes a hose connection portion, which is connected to a reservoir (not shown) attached to the vehicle body via a connection hose (not shown).

In addition, the connecting portion 13 includes two
The remaining portions forming the connecting portion 13 are formed by connecting the union portion 10 to the master cylinder 1 and supporting each load applied when the vehicle is equipped with the union portion 10. On the other hand,
It is designed to have sufficient durability and to ensure uniform cooling of each part during molding of the union part 10. Note that the coupling portions 14a, 1
4b is integrally molded with the connecting portions 13a, 13b formed across the two long holes 13c, 13d, and the insertion holes 15a, 15b for connection with the master cylinder 1 are formed in the cylinder. It is provided in a direction perpendicular to the cylinder axis of the main body 2.

On the other hand, a connecting pin 1 is provided on the side of the connecting portion 13.
In order to engage the pin 16a of No. 6, the engagement part 1 has a hook part 17a with a retaining structure at one end.
Form 7.

The cylinder body 2 of the master cylinder 1 includes:
In order to couple with the union part 10, a mounting part 2a disposed between the coupling parts 14a, 14b of the union part 10 has the insertion holes 15a, 15b provided in the coupling parts 14a, 14b; Insertion holes 2b are provided so that they are on the same axis when coupled.

Next, in order to couple the union part 10 to the master cylinder 1, one longitudinal pin 16b of the coupling pins 16 formed in a substantially L-shape is used to connect the union part 10 to the master cylinder 1 through the insertion holes of the coupling parts 14a and 14b. 15
a, 15b and the insertion hole 2b of the mounting portion 2a in the cylinder body 2 are fitted on the same axis to couple them together.

After coupling, the pin 16a of the coupling pin 16 is rotated in the direction shown by the arrow in FIG. In this case, the pin 16a
What is necessary is to press it against the elastic force of the hook part 17a of the engaging part 17. In addition, the pin 1
6a from the hooking portion 17, by pressing the pin 16a against the elastic force of the hooking portion 17a, the hooking portion 17a is pushed away and removed.

As described above, the attachment and detachment of the pin 16a to and from the engaging portion 17 can be achieved by a simple operation, but once the pin 16a is engaged, the hooking portion 17a of the engaging portion 17 is attached to the pin 16a. Because it has a structure that prevents it from coming off, it will not come off even with the vibrations that occur when the vehicle is running.

Note that the technology of the present invention is not limited to the technology in the above-mentioned embodiments, and may be implemented by means of other modes having similar functions. Changes and additions are possible.

g. Effects of the invention As is clear from the above explanation, according to the invention, the inlet union for the master cylinder has a connection part formed integrally with a plurality of pipes for supplying working fluid, and a connecting pin for engaging the coupling pin. It consists of a union member having an engaging part formed therein, a coupling part for coupling to the master cylinder, and an approximately L-shaped coupling pin, and when coupling with the master cylinder, one of the coupling pins is The coupling part of the union member is coupled to the master cylinder by fitting the parts, and the other pin part of the coupling pin is engaged with the engagement part of the union member. The let union is fixed to the master cylinder side without any gaps, and the assembly work for connection is extremely easy. Furthermore, there is no need for stepped mounting screws or thread machining for coupling as in conventional products, and the machining process as a whole is simplified.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an inlet union for a master cylinder showing one embodiment of the present invention, and Fig. 2 is a plan view of an inlet union for a master cylinder showing an embodiment of the present invention.
FIG. 3 is a partial cross-sectional view taken along the line - in the figure, and FIG. 3 is a perspective view of the main part. 1... Master cylinder, 2b... Insertion hole, 10
... Union section, 11, 12 ... Pipe line, 13 ...
Connection part, 14a, 14b... Connection part, 15a, 1
5b...insertion hole, 16...coupling pin, 17...engaging portion.

Claims (1)

[Claims for Utility Model Registration] A master cylinder is connected to a master cylinder in which a plurality of sets of pistons and pressure chambers are arranged vertically, and has a plurality of independent pipe lines for supplying working fluid from a reservoir to each of the pressure chambers. In the inlet union, the plurality of pipes are integrally molded by a connecting part, and an engaging part for engaging a part of the connecting pin described later is formed on the side thereof, and the connecting part has an approximate shape. A union member is formed with a connecting part having an insertion hole for connecting to the master cylinder from the center, and when the union member is connected to the master cylinder, one pin part of the union member is connected to the insertion hole of the connecting part in the front union member. , a master cylinder comprising a substantially L-shaped coupling pin which is inserted into an insertion hole provided on the cylinder side to fix both, and the other pin part is engaged with the engagement part of the union member. Inlet union for use.