Hydraulic Pressure Adjustment Valve With Spring Travel Restriction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure adjustment valves in hydraulic systems, such as those used in rotary tillers connected to tractors, face challenges in maintaining consistent pressure adjustments due to repeated spring compression, leading to inappropriate pressure control and increased costs from complex structures.
Innovation Solution
A valve unit with a pressure adjustment valve body, a compression coil spring, and a restriction member that keeps the valve closed at lower pressures and opens at higher pressures, using a concentric arrangement to prevent excessive spring compression and maintain consistent pressure adjustments without a complex structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple relief valve with spring is used for pressure adjustment, then cost is reduced, but the spring's urging force decreases due to repeated compression leading to inappropriate pressure adjustment
Solution Approach 1:
A restriction member is introduced as an intermediary component between the valve body and the spring. This restriction member limits the compression distance of the spring, preventing excessive compression that would reduce the spring's urging force. The restriction member acts as a mechanical stop that maintains the spring within its optimal compression range, thereby preserving pressure adjustment reliability while keeping the overall structure simple and cost-effective.
2Reliability
If a complex relief valve structure is used to maintain consistent pressure adjustment, then pressure control reliability is improved, but manufacturing cost increases
Solution Approach 1:
The valve structure is segmented into distinct functional components: the valve body, the spring, and the restriction member. This segmentation allows each component to perform its specific function independently. The restriction member is a simple separate component that can be easily manufactured and assembled, avoiding the need for complex integrated structures while maintaining pressure adjustment consistency.
3Speed
If the spring is allowed to compress freely to open the valve, then the valve opens at the required pressure, but excessive spring compression occurs leading to force degradation
Solution Approach 1:
The restriction member is pre-positioned to define the maximum compression distance of the spring before the valve opening operation occurs. This preliminary positioning ensures that the spring is compressed only to the extent necessary to open the valve at the required pressure, preventing any excessive compression that would degrade the spring's urging force while maintaining timely valve response.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for continuous and appropriate pressure adjustment in hydraulic systems, reducing the risk of spring deformation and maintaining consistent urging force, thereby enhancing system performance without increasing costs.
Implementation Method 1
a compression coil spring applying, to the pressure adjustment valve body, an urging force that keeps the pressure adjustment valve body at a closed position when the pressure of the supply oil passage is smaller than a set value and that allows the pressure adjustment valve body to open when the pressure of the supply oil passage is not smaller than the set value
Implementation Method 2
a restriction member configured to, when the pressure adjustment valve body becomes open against the urging force of the spring in response to a pressure of the operating oil, abut against the pressure adjustment valve body in such a manner as to restrict movement of the pressure adjustment valve body
Data Source
AI summary
A valve unit (V) has a valve housing (50) that includes a supply oil passage (55) configured to receive operating oil from a hydraulic pump, and a pressure adjustment valve (Va) configured to adjust the pressure of the supply oil passage (55). The pressure adjustment valve (Va) includes a pressure adjustment valve body (61) configured to open and close the supply oil passage (55), a compression coil spring (62) that keeps the pressure adjustment valve body (61) at a closed position when the pressure of the supply oil passage (55) is smaller than a set value and allows the pressure adjustment valve body (61) to open when the pressure of the supply oil passage (55) is not smaller than the set value, and a restriction member (63) configured to, when the pressure adjustment valve body (61) becomes open against the urging force of the spring (62) in response to a pressure of the operating oil, abut against the pressure adjustment valve body (61) to restrict movement of the pressure adjustment valve body (61).