Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2007-05-29
2007-05-29
Winner, Tony (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C137S625210
Reexamination Certificate
active
11212727
ABSTRACT:
The present invention provides a hydraulic control valve and a power steering apparatus using the same in which chamfer portions are provided only on throttle portions between oil supply chambers and first oil feed chambers and between the oil supply chambers and second oil feed chambers, or only throttle portions between oil discharge chambers11and the first oil feed chambers and between the oil discharge chambers11and the second oil feed chambers. With this design, even if six or more oil grooves of each of a valve body and a valve spool are disposed at equal distances from one another, when the minimum flow rate to be controlled is reduced as small as possible, a distribution amount for one portion where the flow rate is controlled can be doubled as compared with a conventional structure, it is possible to stabilize the hydraulic characteristics in a region where the flow rate to be controlled is minimum, and to eliminate the discontinuity of the hydraulic characteristics.
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KoYo Seiko Co., Ltd
Winner Tony
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