Hydraulic Pump Motor Valve Assembly for Compact Chamber Switching
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Solution Overview
Problem
The existing hydraulic pump device has a complex structure due to separately disposed valve elements, leading to a large size in the up-down direction and mechanical complexity.
Innovation Solution
A compact motor with a supply/discharge valve that includes unitary first and second valve members, synchronized to switch between supplying and discharging pressure fluid to and from both motor chambers, simplifying the structure and reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If valve elements are separately disposed in the housing, then each valve element can be independently controlled, but the device complexity increases and the size in the up-down direction becomes large
Solution Approach 1:
The patent combines multiple valve elements (switching valve element and supply valve element) into a single integrated valve assembly. The switching valve element and supply valve element are positioned at different levels on the same valve body, allowing independent control of both motor chambers through a unified structure. This merging approach reduces the number of separate components while maintaining independent valve control functionality.
2Ease of operation
If valve elements are separately disposed in the housing, then each valve element can be independently controlled, but the size in the up-down direction becomes large
Solution Approach 1:
The patent transitions from a vertical stacking arrangement of valve elements (up-down direction) to a multi-level radial arrangement on a single valve body. The switching valve element and supply valve element are positioned at different heights on the valve body but controlled through a unified actuation mechanism, effectively utilizing the valve body's radial and circumferential dimensions rather than extending the overall device height.
3Reliability
If three valve elements are separately driven, then each valve can respond to pressure conditions, but the structure becomes complicated
Solution Approach 1:
The integrated valve assembly performs multiple functions through a unified structure. The single valve body houses both the switching valve element (responsive to first motor chamber pressure) and the supply valve element (responsive to second motor chamber pressure). The valve mechanism can simultaneously or sequentially respond to pressure conditions in both motor chambers, providing reliable pressure-responsive control without requiring three separate valve assemblies.
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 results in a compact, mechanically simple motor and hydraulic pump device with synchronized valve operation, enhancing efficiency and reducing size constraints.
Implementation Method 1
pressure fluid supplied to the pressure supply chamber 28 pushes and moves the supply/discharge valve 13 to a first position
Implementation Method 2
pressure fluid is supplied to the switching actuation chamber 36 pushes and moves the supply/discharge valve 13 to a second position
Data Source
AI summary
A piston (8) is provided in a motor main body (4). A first motor chamber (9) is provided above the piston (8) and a second motor chamber (10) is provided below the piston (8). A pilot valve element (18) is provided so as to protrude from the piston (8). When a supply/discharge valve (13) is moved to its upper limit position or its lower limit position by the movement of the pilot valve element (18) in an up-down direction, a first valve member (25) of the supply/discharge valve (13) switches between supplying and discharging pressure fluid to and from the first motor chamber (9) and a second valve member (26) of the supply/discharge valve (13) switches between supplying and discharging pressure fluid to and from the second motor chamber (10).