Bi-directional Shock Valve for Hydraulic Pressure Protection
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Solution Overview
Problem
Existing hydraulic transmission systems in riding lawn mowers and similar vehicles lack effective protection against shock loads, which can cause damage to components like hydraulic motors and pumps due to the absence of integrated relief or shock valves, and existing solutions either protect only the pump or require complex two-valve systems without adjustable load settings.
Innovation Solution
A bi-directional shock valve assembly is placed in the fluid path between ports in a hydraulic device, capable of blocking or allowing fluid flow based on pressure differentials, temporarily opening to dissipate pressure spikes in either direction, thereby protecting the hydraulic system from shock loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two one-way relief valves are used in the fluid path in the hydraulic motor, then pressure protection is provided in both directions, but the system complexity increases and adjustment of load settings becomes difficult
Solution Approach 1:
The invention merges two separate one-way relief valve functions into a single bi-directional relief valve assembly. This unified structure provides pressure relief in both directions (forward and reverse) through one integrated component rather than requiring two separate valves. The assembly includes a valve body with ports for bidirectional fluid flow, a movable valve member, and a spring mechanism that enables the single assembly to perform the function of two valves while reducing overall system complexity.
Solution Approach 2:
The invention implements an adjustable spring mechanism that allows the relief pressure threshold to be dynamically changed. The spring can be replaced with different stiffness values or pre-loads to adjust the load at which the valve opens, providing flexibility in setting protection levels for different operating conditions. This dynamic adjustment capability eliminates the need for complex electronic controls while maintaining adaptability.
2Device complexity
If no relief valve is integrated into the hydraulic transmission, then the system design is simpler, but the components are vulnerable to damage from shock loads and excessive pressure
Solution Approach 1:
The invention implements a self-protecting hydraulic system where the relief valve assembly is integrated directly into the hydraulic motor housing. The valve automatically activates when pressure exceeds the spring-set threshold, providing self-protection without requiring external control systems or complex monitoring. The simple mechanical spring-valve mechanism self-regulates pressure by opening to relieve excess pressure and closing when pressure returns to normal, maintaining both simplicity and reliability.
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 bi-directional shock valve assembly effectively absorbs pressure shocks in hydraulic systems by allowing fluid flow when pressure differentials exceed a threshold, reducing the risk of damage to components and allowing for adjustable pressure settings, thus providing comprehensive protection against shock loads.
Implementation Method 1
block fluid flow through a passage in a first direction in response to a greater pressure acting on a first side of the valve assembly as compared to a second side of the valve assembly
Implementation Method 2
a spring member configured to urge the valve member toward the valve seat
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A shock valve assembly for a hydraulic system includes a fluid path extending between a first port and a second port with a shock valve disposed in the fluid path to normally block fluid flow through the fluid path between the first and second ports. The shock valve temporarily opens to permit fluid flow between the first port and a second port through the fluid path when a fluid pressure differential between the ports exceeds a predetermined threshold. Fluid flow occurs in a first direction from the first port to the second port through the fluid path when the shock valve is temporarily opened and fluid pressure in the first port is greater than the second port. Fluid flow occurs in a second, reverse direction through the fluid path from the second port to the first port when the shock valve is temporarily opened and fluid pressure in the second port is greater than the first port.