Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
1999-10-25
2001-06-12
Bulter, Douglas C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303SDIG001, C137S884000
Reexamination Certificate
active
06244671
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a hydraulic actuator used for a brake system, and in particular a hydraulic actuator that controls the brake pressure of an automotive wheel in order to prevent wheel locking or to apply an optimal traction to driven wheels. Many different types of hydraulic actuator for a brake system have been proposed. One such hydraulic actuator includes a housing having a hydraulic circuit through which a brake oil flows, a plurality of solenoid valves placed in respective bores formed in the housing, a motor attached on one side of the housing, and a control unit attached on the other side thereof. The control unit controls the solenoid valves and the motor so as to apply an optimized brake pressure to the wheels in accordance with the condition of the wheels. As an example, in U.S. Pat. No. 5,449,226, the hydraulic actuator includes a housing, which is made of aluminum and has an opening or a hole through which a lead line is extended. A control unit and a motor are attached to one side and opposite side of the housing, respectively. A negative terminal of the motor is connected to the housing so as to establish a connection ground. One end of the lead line is connected to a positive terminal of the motor by welding. The other end of the lead line is connected to an end portion of the control unit so that the control unit can control the motor.
In this case, welding is required to connect the positive terminal of the motor with the end of the lead line, so that it increases the ease of assembly. Moreover, when the hydraulic actuator is exposed to a severe oscillation condition, the connection of the lead between the motor and the control unit might become poor or entirely broken. Furthermore, the positive lead disposed in the opening or the hole may contact with an internal surface of the opening or hole due to the oscillation, and short-circuit.
SUMMARY OF THE INVENTION
It is, therefore, an object to the present invention to provide an improved a hydraulic actuator for a brake system which achieves high efficiency for assembly and high electrical reliability.
In order to achieve the object, there is provided a hydraulic actuator for a brake system which includes a housing having a hydraulic circuit in which brake oil flows, a control unit being attached on one side of the housing, and similarly, a motor being attached on the other side thereof. A first terminal connected to the motor extends through a hole formed in the housing. A connector for the motor, having an outside portion that is made of an electrical insulating material is fitted into the hole. The inside portion is adapted to retain the first terminal that is electrically connected to the motor. A connector for the control unit, which has an inside portion for retaining a second terminal that is electrically connected to the control unit, also has an external portion that can be plugged into the connector for the motor. When the motor connector and the control unit connector are mated, the first terminal and the second terminal will establish an electrical connection between the motor and the control unit.
REFERENCES:
patent: 5449226 (1995-09-01), Fujita et al.
patent: 5452948 (1995-09-01), Cooper et al.
Bulter Douglas C.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Unisia Jecs Corporation
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