JPH0224689Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of the reservoir structure of a tandem master cylinder for a vehicle.

[Prior Art] Conventionally, tandem master cylinders have a reservoir provided above the flange portion at the center of the cylinder body, so the upper part of the communication fluid path formed on the side of the cylinder body is a dead space. However, in recent years, as air conditioner units, turbochargers, etc. have become popular in vehicle engine compartments, space is running out, and it has become necessary to utilize dead space in the master cylinder as well.

[Purpose of the invention] The present invention was developed in view of the above points, and effectively utilizes the dead space above the communicating liquid path formed in the cylinder body to facilitate positioning of the reservoir and locking of the lead wire of the level indicator device. The present invention provides a reservoir structure for a tandem master cylinder.

[Structure of the invention] In order to achieve the above object, in the present invention, a primary piston and a secondary piston are provided in the cylinder hole of the cylinder body so as to be movable in a liquid-tight manner. Independent pressure liquid chambers are defined in front of the Dali piston, a single reservoir communicating with each pressure liquid chamber is provided in the upper part of the cylinder body, and a communicating liquid path connects this reservoir and one of the pressure liquid chambers. In a tandem type master cylinder in which a reservoir body is formed on the side of the cylinder body in the cylinder axial direction, the reservoir body is located above a reservoir chamber that communicates with two auxiliary liquid reservoirs provided on the reservoir mounting flange of the cylinder body and the communicating liquid path. a level indicator storage chamber, a leg portion is extended below the level indicator storage chamber, a lower end of the leg portion is locked to the cylinder body, and a lead wire locking hole is bored in the leg portion. It is characterized by having been established.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

A primary piston 3 and a secondary piston 4 are fitted in a cylinder hole 2 formed in the cylinder body 1 in a fluid-tight and movable manner. Pressure fluid chambers 5 and 6 are defined in the primary piston 3 and secondary piston 4, respectively, and replenishment fluid chambers 7 and 8 are defined in the small diameter portion of the primary piston 3 and the secondary piston 4, respectively. A reservoir mounting flange portion 9 is integrally formed on the upper surface of the cylinder body 1 to protrude, and the inside thereof is surrounded by a partition wall 10 having approximately the same height as the reservoir mounting flange portion 9.
3 and 14 are divided. The auxiliary liquid reservoir 13 is connected to the pressure liquid chamber 5 and the communication passage 1 through a communication liquid passage 12 and a relief port 12a, which are bored in a ridge 11 formed in the cylinder axial direction at the upper part of the cylinder body 1.
2b, the auxiliary liquid reservoir 14 communicates with the replenishment liquid chamber 8 through the supply port 14a, and the pressure chamber 6 communicates with the replenishment liquid chamber 8 through the stem hole 14b. It's communicating.

The reservoir body 15 is molded from synthetic resin, and is attached to the cylinder body 1 by fitting a mounting portion 16 formed at its bottom into the reservoir mounting flange portion 9 and tightening it with a reservoir band 17. This reservoir body 15 has a shallow front 15a and a deep rear 15b, and has a rectangular planar shape as shown in FIG. A reservoir chamber 18 communicating with two auxiliary liquid reservoirs 13 and 14 provided in the reservoir mounting flange portion 9 of the cylinder body 1 and a level indicator storage chamber 19 located in a dead space above the ridge portion 11 are formed in the cylinder body 1. , are partitioned by a substantially arc-shaped partition wall 20 and a substantially circumferential partition wall 21, respectively. The substantially arc-shaped partition wall 2
0 and the rear of the substantially circumferential partition wall 21 (at the right end in the figure), there is a slit 22 that runs longitudinally through the partition wall.
are formed at the top and bottom.

Three ribs 24 are provided on the left side of the opening 23 communicating with the auxiliary liquid reservoirs 13 and 14 of the reservoir chamber 18, and serve as reinforcement and a brake fluid filling jig insertion guide. On the other hand, in the center of the level indicator storage chamber 19, a cylindrical case 25 extends from the lower part of the reservoir body 15 in a cylindrical shape and has a sealed upper part. Magnet 27 on the outside and inside of the
A cylindrical float 28 fitted with a cylindrical float 28 is loosely fitted, and the switch is configured to close when the brake fluid level reaches a low level.

A leg portion 29 is provided at the lower part of the level indicator storage chamber 19 of the reservoir body 15 and extends toward the ridge portion 11 of the cylinder body 1. It straddles it and holds both sides of it. Furthermore, a locking hole 31 for a lead wire 30 connected to the reed switch 26 of the level indicator is provided at the base of the forked part of the leg part 29, and the lead wire 30 is locked through a groove 31a from the base of the forked part. It is becoming possible to do so.

Note that 32 is a filter, and 33 is a lid having an atmospheric pressure chamber.

When the leg portion 29 is configured in this way, the leg portion 29 extending to the reservoir body 15 clamps the side surface of the ridge portion 11 of the cylinder body 1, so that the reservoir body 1
5 can be positioned and prevented from rotating.
In addition, since a hole is drilled in the leg portion 29 to lock the level indicator lead wire 30, in the event that the level indicator lead wire 30 is connected from the master cylinder to the warning lamp in the driver's cabin when inspecting the engine room of the vehicle. Even if there is interference, the load is received by the locking hole 31 provided in the leg portion 29, thereby preventing breakage of the lead wire 30 at the connection portion of the reed switch 26.

In this example, the lower end of the leg is formed into a bifurcated shape, which straddles the ridge of the cylinder body and clamps and locks both sides of the leg. Fitting holes may be drilled and legs may be inserted, or other suitable locking means may be used.

[Effects of the invention] As explained above, in the present invention, the reservoir main body is formed by the reservoir chamber and the level indicator storage chamber located in the dead space above the communicating liquid path,
Since the leg portion is extended to the lower part of the level indicator storage chamber and the lower end of the leg portion is locked to the cylinder body, the reservoir body can be positioned and prevented from rotating. Further, since holes are formed in the leg portions to lock the lead wires, even if the lead wires are interfered with during inspection, breakage of the reed switch connection portion can be prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional front view of a tandem-type master cylinder, and FIG.
The figure is a plan view showing the internal structure of the reservoir, and FIG. 3 is a cross-sectional view taken from FIG. 1. 1... Cylinder body, 2... Cylinder hole, 3...
...Primary piston, 4...Secondary piston, 5, 6...Pressure liquid chamber, 9...Reservoir mounting flange portion, 10...Partition wall, 11...Rug portion, 12
...Communication liquid path, 13, 14...Auxiliary liquid reservoir, 15...
...Reservoir body, 18...Reservoir chamber, 19...
Level indicator storage chamber, 25...Tubular case, 26...Reed switch, 29...Legs, 3
0... Lead wire, 31... Locking hole.

Claims (1)

[Scope of utility model registration request] A primary piston and a secondary piston are provided in the cylinder hole of the cylinder body so as to be movable in a fluid-tight manner, and independent pressure fluid chambers are defined between the primary piston and the secondary piston and in front of the secondary piston, and the cylinder Equipped with a single reservoir at the top of the main body leading to each pressure liquid chamber,
In a tandem type master cylinder in which a communication fluid path connecting this reservoir and one of the pressure fluid chambers is formed on the side of the cylinder body in the cylinder axial direction, the reservoir body is connected to two auxiliary fluids provided on the reservoir mounting flange of the cylinder body. It is formed by a reservoir chamber communicating with the reservoir and a level indicator storage chamber located above the communicating liquid path, and a leg portion is extended below the level indicator storage chamber, and a lower end of the leg portion is engaged with the cylinder body. 1. A reservoir structure for a tandem master cylinder, characterized in that a lead wire locking hole is formed in the leg portion.