Pressure-adjusting reservoir for ABS and vehicle brake...

Details Pressure-adjusting reservoir for ABS and vehicle brake... Pressure-adjusting reservoir for ABS and vehicle brake...

1999-09-03

2001-10-16

Oberleitner, Robert J. (Department: 3613)

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

C303S115100

Reexamination Certificate

active

06302498

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application is based upon Japanese Patent Application Nos. Hei. 10-252814 filed on Sep. 7, 1998 and Hei. 11-209588 filed on Jul. 23, 1999, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a pressure-adjusting reservoir and especially to a pressure-adjusting reservoir for ABS (Antilock Brake System) suitable for vehicle ABS control, and a vehicle brake device using the same.
2. Related Art
Conventional vehicle brake device for performing an ABS control using a pressure-adjusting reservoir (switch reservoir) is disclosed in Japanese patent application Laid-open No. Hei. 6-8810.
FIG. 11
shows the pressure-adjusting reservoir
200
according to a related art. The vehicle brake device using the pressure-adjusting reservoir
200
is capable of adjusting a high master cylinder pressure by a pressure-adjusting valve
201
provided to the pressure-adjusting reservoir
200
. That is, the pressure-reservoir is constructed so as to prevent the high master cylinder pressure from being applied to a sucking port of a pump even if an amount of brake fluid becomes full in the pressure-adjusting reservoir, when the brake fluid in the pressure-adjusting reservoir
200
is sucked by the pump.
FIG. 12
is an enlarged partial view of the pressure-adjusting valve
201
of the pressure-adjusting reservoir
200
.
FIG. 12
shows a condition that the pump is operated when a brake pedal is depressed. The pressure-adjusting valve
201
will be concretely explained with reference to this figure.
The pressure-adjusting valve
201
is constructed by a ball valve
202
, a valve seat
203
, and a pin
205
interlocked with a reservoir piston
204
(see FIG.
11
). When the pressure-adjusting reservoir
200
has an enough space into which the brake fluid flows and the ball valve
202
is separated from the valve seat
203
by the pin
205
, the pressure-adjusting valve
201
allows the brake fluid to flow to the pressure-adjusting reservoir
200
through a gap between the ball valve
202
and the valve seat
203
. On the contrary, when the pressure-adjusting reservoir
200
has not enough space into which the brake fluid flows, the ball valve
202
contacts with the valve seat
203
so that the pressure-adjusting valve
201
stops the brake fluid flowing to the pressure-adjusting reservoir
200
.
However, as shown in this figure, the pin
205
of the conventional pressure-adjusting reservoir
200
is formed so that a seat face
205
a
contacting with the ball valve
202
is perpendicular to an axis of the pin
205
. Therefore, the ball valve
202
may unstably move and this movement may cause a pulse of the brake fluid pressure or the like.
Especially, when the ball valve
202
is pushed up toward the pin
205
by a spring
206
, the unstable movement of the ball valve
202
becomes remarkable by an action of a spring force and a fluid force applied to the ball valve
202
.
SUMMARY OF THE INVENTION
This invention has been conceived in view of the background thus far described and its first object is to reduce an unstable movement of a ball valve.
According to the present invention, a pin has a tip portion having a slant portion substantially slanted with respect to a slide direction of the pin. In this case, a ball valve can be contacted at plural portions including the slant portion of the pin and another portion (e.g., an inside wall of a housing in which the ball valve is to be arranged), and can be stable without unstable movement.


REFERENCES:
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patent: 4290152 (1981-09-01), Kesselman
patent: 4431026 (1984-02-01), Fehrenbach et al.
patent: 4703979 (1987-11-01), Nakanishi et al.
patent: 4825903 (1989-05-01), Ochs et al.
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patent: 5036960 (1991-08-01), Schenk et al.
patent: 5215359 (1993-06-01), Burgdorf et al.
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patent: 5405191 (1995-04-01), Nishiyama et al.
patent: 5556175 (1996-09-01), Hayakawa et al.
patent: 6142394 (2000-11-01), Hefler et al.
patent: 4202388 A1 (1993-08-01), None
patent: 5-262218 (1993-10-01), None
patent: 6-8810 (1994-01-01), None
patent: 2670340 (1997-07-01), None

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