Hydraulic Pump Motor Variable Valve Fluid Path Control
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Solution Overview
Problem
In fluid pressure pump motors used in assist regeneration devices, the hydraulic fluid supply to the assist pump is hindered by the simultaneous flow of hydraulic fluid discharged from the regenerative motor, leading to insufficient fluid supply when both assistance and regeneration are performed simultaneously.
Innovation Solution
Incorporating a variable valve in the supply/discharge passage that reduces the fluid path area when both the fluid pressure pump and motor are simultaneously actuated, ensuring a stable hydraulic fluid supply by controlling the fluid path area, which is larger when only one component is active.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common supply/discharge passage is used for both the assist pump and regenerative motor, then device complexity is reduced, but hydraulic fluid supply to the assist pump becomes insufficient when both components operate simultaneously
Solution Approach 1:
A variable valve is introduced to dynamically adjust the fluid path area of the supply/discharge passage based on operational conditions. When both the assist pump and regenerative motor operate simultaneously, the valve reduces the fluid path area to prioritize hydraulic fluid supply to the assist pump, ensuring sufficient flow while maintaining a simplified common passage structure.
2Reliability
If the fluid path area is reduced when both pump and motor operate simultaneously, then hydraulic fluid supply stability is improved, but pressure loss increases
Solution Approach 1:
The variable valve dynamically adjusts the fluid path area based on operational mode. When only one component (assist pump or regenerative motor) operates, the valve maintains a larger fluid path area to minimize pressure loss. When both components operate simultaneously, the valve reduces the fluid path area to ensure stable hydraulic fluid supply to the assist pump, accepting increased pressure loss only when necessary for system 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
This solution stabilizes the hydraulic fluid supply to the fluid pressure pump even during simultaneous operation, preventing hydraulic fluid discharge from reducing pump-in capacity and enhancing efficiency by minimizing pressure loss in the supply/discharge passage.
Implementation Method 1
a variable valve provided in the supply/discharge passage and capable of controlling a fluid path area of the supply/discharge passage
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A fluid pressure pump motor (100, 200, 300, 400) includes a supply/discharge passage (4) where both a hydraulic fluid pumped in to a fluid pressure pump (10) and a hydraulic fluid discharged from the fluid pressure motor (20) flow, and a variable valve (7, 207, 307, 407) provided in the supply/discharge passage (4) to control the fluid path area of the supply/ discharge passage (4). The variable valve (7, 207, 307, 407) reduces the fluid path area of the supply/discharge passage (4) for simultaneously actuating the fluid pressure pump (10) and the fluid pressure motor (20) to be smaller than the fluid path area for actuating only one of the fluid pressure pump (10) and the fluid pressure motor (20).