Hydraulic Machine Direction-Changing Drawer for Easier Manufacture
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Solution Overview
Problem
The manufacture of hydraulic machines with direction changing slide valves is complex and costly due to the need for compact slide valves that minimize internal leakage, leading to constraints on bulk and material usage.
Innovation Solution
The hydraulic machine design includes a displacement selection slide valve coaxial with the distributor and a direction changing slide valve positioned away from the axis of rotation, either in the distributor or distribution cover, reducing bulk constraints and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the direction changing slide valve is miniaturized to reduce bulk, then the machine size is reduced, but manufacture becomes more costly and reaches dimensional limits due to increased leakage risks
Solution Approach 1:
The direction changing slide valve is repositioned from a coaxial arrangement (along the rotation axis) to an eccentric arrangement (at a distance from the rotation axis). This spatial reconfiguration in another dimension allows the valve to function effectively without requiring miniaturization, thereby avoiding the manufacturing complexity and leakage issues associated with small-scale components.
2Device complexity
If the direction changing slide valve is positioned coaxially with the rotation axis, then compactness is achieved, but manufacture becomes more complex due to space constraints and leakage prevention requirements
Solution Approach 1:
The direction changing slide valve is extracted from the coaxial arrangement and repositioned to an eccentric location at a distance from the rotation axis. This separation removes the valve from the constrained central space, allowing for easier manufacturing without compromising the compact overall structure of the hydraulic machine.
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 configuration facilitates the production of high-performance two-displacement hydraulic machines with minimized leakage and reduced manufacturing complexity, while maintaining operational efficiency.
Implementation Method 1
The slide valve is controlled by the pressure difference at the terminals of the machine
Implementation Method 2
Known from document FR-3 024 503 is a hydraulic machine comprising a casing, radial pistons, a multilobe cam and a distributor
Data Source
AI summary
The invention relates to a hydraulic machine (100) comprising:—a distribution cover (2.3);—a distributor (16);—a displacement selection drawer (35) mounted so as to slide between a first position in which the machine is configured to operate with a first displacement and a second position in which the machine is configured to operate with a second displacement different from the first displacement; and—a direction changing drawer (26) mounted so as to slide between a first position in which the machine is configured to exert a torque in a first direction about an axis of rotation (10) and a second position in which the machine is configured to exert a torque in a second direction, the direction changing drawer (26) being mounted so as to slide along an axis (42) at a distance from the axis of rotation (10), the direction changing drawer extending:—in a wall of the distributor (16); or—in a wall of the distribution cover and outside the displacement selection drawer (35).