JPH0143341Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a master cylinder in a two-stage hydraulic brake system for automobiles.

[Conventional technology]

Some oil pumps are equipped with a valve device consisting of a check valve and a differential pressure valve between the oil passage connecting the reserve tank and the master cylinder. This valve device has a concave cylindrical socket provided on the upper surface of the master cylinder, into which the valve device is fitted, and then a downwardly convex portion of the reserve tank is attached to the upper socket.

Figures 5 and 6 show the conventional device structure, with the socket 2
The valve device 5 is fitted into the coil spring 8, a cover 26 is placed over the coil spring 8, and a C ring 27 made of a spring material is used to prevent it from coming off upward. (Refer to Japanese Patent Application Laid-Open No. 1983-63562).

[Problem that the invention attempts to solve]

This is an attempt to reduce the structure consisting of two parts, the cover and the spring material, to one part. Further, since conventionally the valve device has not been fixed in the downward direction within the socket, it is also attempted to fix the position in the downward direction.

[Means for solving problems]

This will be explained with reference to FIGS. 1 to 4.

A hydraulic outlet tube 12 is provided on the lower surface of the reserve tank 11, and the hydraulic outlet tube 12 is configured to be inserted into the master cylinder 1 and the cylindrical socket 2 provided on the upper surface, and the check valve 9 is connected by a coil spring 8. In a two-stage actuation type master cylinder in which a valve device having a structure in which a valve is pressed against the upper surface of a valve seat 6 is arranged in a socket 2 directly below a hydraulic outlet pipe 12, a substantially cross-shaped spring member 25 is used. The coil spring guide part 15 is formed by bending the coil spring 8 in the same direction leaving the center part intact, and the two opposing arm pieces 16 and 17 are further bent outward and an enlarged wing is formed in the bent part. The enlarged wing pieces 18, 19 are inserted into the annular groove 22 of the peripheral wall of the socket 2, and the other two opposing arm pieces 20,
21 is bent outward, and the arm pieces 20, 21 are
It is inserted into a through hole 23 of a protrusion 24 protruding from the periphery of the valve seat 6.

〔Example〕

This will be explained based on FIGS. 1 to 4.

Reference numeral 11 designates a reserve tank, which has a hydraulic pressure outlet tube 12 provided on its lower surface, and the hydraulic pressure outlet tube 12 is inserted into a cylindrical socket 2 provided on the upper surface of the master cylinder 1 via a rubber bush 13.

5 is a valve device, 6 is a valve seat of the valve device 5, and a check valve 9 is provided on the upper surface side of the valve seat 6 by a coil spring 8, and a differential pressure valve 7 is provided on the lower surface side. The valve device 5 is arranged with a seal ring 10 and the hydraulic outlet pipe 1
It is arranged in the socket 2 directly below the socket 2.

Reference numeral 25 denotes a substantially cross-shaped spring member, which is bent in the same direction leaving the center part 14 so as to surround the coil spring 8 to form a coil spring guide part 15. The enlarged wing pieces 18, 19 are bent outward and have enlarged wing pieces 18, 19 having small holes 18a, 19a in the bent parts.
19 is reduced in diameter by a jig inserted into the small holes 18a and 19a, and inserted into the annular groove 22 in the peripheral wall of the socket 2. The other two opposing arm pieces are bent outward, and the arm pieces 20 and 21 are inserted into the through hole 23 of a protruding piece 24 protruding from the periphery of the valve seat 6.
Note that 3 is a relief port and 4 is a supply port.

[Effect]

The spring material 25 serves as a spring seat for the coil spring 8 that presses down the differential pressure valve 9, and also fixes the valve device 5 to the socket 2.

[Effect of idea]

The spring seat and the valve device are fixed using the same part. Therefore, the number of parts can be reduced.

In addition, arm pieces 16, 17 and arm pieces 20, 21
Since the vertical position of the valve device is fixed by this, there is no relative movement of the valve device 5 with respect to the socket 2, and troubles with the valve device 5 can be reduced.

[Brief explanation of drawings]

Figures 1 to 4 show this invention. Figure 1 is a schematic side view cut vertically, Figure 2 is a plan view of the main part, Figure 3 is a cross-sectional view taken along the - line in Figure 2, and Figure 4 is a perspective view of the same as above. Figures 5 and 6 show the conventional example, with Figure 5 being a vertically cut side view of the main part, and Figure 6 being
The figure is a plan view of the same as above. 1 master cylinder, 2 cylindrical socket, 3
Relief port, 4 Supply port, 5 Valve device, 6 Valve seat (of the valve device), 7 Check valve (of the valve device), 8 Coil spring, 9 Differential pressure valve, 1
0 Seal ring, 11 Reserve tank, 12
Hydraulic outlet tube, 13 Rubber bush, 14 Center part, 15 Coil spring guide part, 16, 17 Arm piece, 18, 19 Expanded wing piece, 18a, 19a
Small hole, 20, 21 Arm piece, 22 Annular groove, 23
Through hole, 24 Projection piece, 25 Approximately cross-shaped spring material, 2
6 cover, 27 C ring.

Claims (1)

[Scope of utility model registration request] A hydraulic outlet pipe is provided on the bottom surface of the reserve tank, and the hydraulic pressure outlet pipe is inserted into the master cylinder and a cylindrical socket provided on the top surface, and the check valve is pressed against the top surface of the valve seat by a coil spring. In a two-stage master cylinder in which a valve device having a structure is arranged in a socket directly below a hydraulic outlet cylinder, a substantially cross-shaped spring material is arranged in the same direction so as to surround a coil spring, leaving the central part. The arm pieces are bent to form a coil spring guide part, and the two opposing arm pieces are further bent outward, and an enlarged wing piece is provided on the bent part, and the enlarged wing piece is inserted into an annular groove in the peripheral wall of the enlarged wing socket. , a two-stage operating type master cylinder formed by bending the other two opposing arm pieces outward and inserting the arm pieces into a through hole of a protrusion protruding from the periphery of the valve seat.