Title:
METHOD FOR MANUFACTURING HYDRAULIC PRESSURE CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/2021/125130
Kind Code:
A1
Abstract:
A method for manufacturing a hydraulic pressure control valve in which a spool slides along the inner wall of a sleeve, the method including a pressure adjustment step in which output hydraulic pressure in a prescribed drive condition of a drive unit is adjusted to a target hydraulic pressure (P2) by rotating an adjustment screw and adjusting the set load of a spring. In a preparatory stage of the pressure adjustment step, a tool is brought into contact with the inner wall of a rotation-transmitting section so that there is no gap between the tool and the rotation-transmitting section at least in the rotation direction of the tool. After the preparatory stage, in an adjusted rotation amount calculation stage: a pre-adjustment hydraulic pressure (P1), which is the output hydraulic pressure at a pre-adjustment rotation position of the adjustment screw in the prescribed drive condition, is detected; and an adjustment rotation amount (θ) from the pre-adjustment rotation position to a target rotation position corresponding to the target hydraulic pressure (P2) is calculated on the basis of a differential pressure (ΔP) between the pre-adjustment hydraulic pressure (P1) and the target hydraulic pressure (P2), and a correction amount (θc) that corresponds to a product characteristic. In a rotation stage, the adjustment screw is rotated by the adjustment rotation amount (θ).
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Inventors:
HIRANO AKINORI (JP)
Application Number:
PCT/JP2020/046504
Publication Date:
June 24, 2021
Filing Date:
December 14, 2020
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
F16K31/06; F16F1/12
Foreign References:
| JP2015165147A | 2015-09-17 | |||
| JP2015110954A | 2015-06-18 |
Attorney, Agent or Firm:
HATTORI & PARTNERS (JP)
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