Control Valve Spring Retention Structure for Accurate Assembly
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Solution Overview
Problem
Conventional control valves experience installation failures due to the bias member being movable in its radial direction, leading to incorrect sandwiching between the seal member and the cap, and potential damage from interference with the seal member during insertion.
Innovation Solution
The control valve design includes a second inner peripheral section with a depression in the radial direction, occupying a partial circumferential region, to guide and retain the bias member, preventing radial movement and ensuring correct installation, and features a tapered connection between the first and second inner peripheral sections to facilitate smooth passage of the seal member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bias member is contained in the inner circumferential part of the cap with a gap for insertion, then the cap can be inserted into the first communication passage, but the bias member becomes movable in its radial direction causing installation failure
Solution Approach 1:
The depression is formed in the second inner peripheral section before assembly, creating a predetermined retention position for the bias member. This preliminary structural preparation ensures that when the bias member is inserted, it is automatically retained at the correct position and cannot move radially, thus preventing installation failure while still allowing the cap to be inserted properly.
2Ease of operation
If the second inner peripheral section has a large gap for cap insertion, then the cap can be easily inserted, but the bias member may interfere with the seal member during insertion
Solution Approach 1:
The depression creates a localized retention zone within the second inner peripheral section. The cap can still be inserted through the outer opening with sufficient clearance, but the bias member is locally constrained within the depression, preventing it from moving outward to interfere with the seal member during insertion. This local quality change resolves the contradiction between ease of insertion and prevention of harmful interference.
Data Source
AI summary
A control valve includes: a second inner circumferential portion capable of holding a first spring, in a first communication passage provided at a first discharge opening of a housing; and a recessed portion recessed in a radial direction, at a position that is a part of a region in a circumferential direction of the second circumferential portion and overlaps a second communication passage opening in a biasing direction of the first spring. Therefore, when inserting the first spring into the first communication passage, it is possible to hold the first spring with the inner circumferential surface of the second inner circumferential portion. Consequently, the first spring is appropriately mounted in the second circumferential portion, thereby preventing a mounting defect of the first spring.