Pump Device Axial Relief Valve Mounting
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Solution Overview
Problem
Conventional pump devices face challenges in attachment to transmission cases due to the protrusion of coil springs or tubular portions, which can interfere with internal components and require increased opening diameters, making size reduction and interference avoidance difficult.
Innovation Solution
The pump device design incorporates a second housing member with a relief flow path and a coil spring arrangement where the central axis is parallel to the rotation axis, minimizing protrusion and allowing for compact integration without increasing the opening diameter, thus reducing size and improving mountability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil spring is disposed with its central axis perpendicular to the rotation axis of the electric motor, then the relief valve can open properly to release oil, but the coil spring or adjusting screw projects outward in the radial direction, preventing attachment to the transmission case
Solution Approach 1:
The patent changes the orientation of the coil spring from radial (perpendicular to rotation axis) to axial (parallel to rotation axis). This dimensional reorientation allows the relief valve to function properly while eliminating radial projection that would prevent attachment to the transmission case.
Solution Approach 2:
Instead of having the coil spring extend radially outward from the motor shaft, the patent inverts the arrangement by having the coil spring extend axially along the rotation axis direction, with the valve body positioned at the end of the coil spring in the axial direction.
2Adaptability or versatility
If the coil spring is disposed with its central axis parallel to the rotation axis of the electric motor, then the pump device can be attached to the transmission case without increasing opening diameter, but the tubular portion protrudes significantly in the axial direction, interfering with internal components
Solution Approach 1:
The patent nests the coil spring and valve body assembly within the housing structure. The coil spring is positioned such that it is accommodated within the axial space of the pump device, and the valve body is integrated into the housing, minimizing the overall axial protrusion while maintaining the parallel-to-rotation-axis configuration for attachment compatibility.
3Adaptability or versatility
If the opening diameter of the transmission case is increased to accommodate the protruding coil spring, then the pump device can be attached, but the size of the transmission case opening increases
Solution Approach 1:
The patent resolves this contradiction by changing the coil spring orientation from radial to axial, thereby eliminating the need to increase the opening diameter. The radial dimension is freed from the coil spring projection, allowing attachment through the existing opening size.
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 enables a more compact pump device that can be easily attached to transmission cases without interfering with internal components, ensuring appropriate relief valve operation based on discharge pressure while maintaining efficient oil flow and pressure management.
Implementation Method 1
a valve body (91) that opens when a discharge pressure becomes equal to or higher than a predetermined value, a coil spring (92) that biases the valve body (91) in the valve closing direction
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3B
AI summary
A pump device includes a rotating body, a pump housing (2) including a suction port (83) and a discharge port (84), and a relief valve (9). In the pump device, a fluid is sucked from the suction port (83) and discharged from the discharge port (84) by rotation of the rotating body. The relief valve (9) includes a valve body (91) and a biasing member. The discharge port (84) includes an one end in a direction in which the discharge port (84) extends. The one end is shallower than a middle portion of the discharge port (84). The pump housing includes a relief flow path through which the fluid flows when the relief valve (9) opens. The relief flow path is provided so as to be open to a groove bottom surface of the one end of the discharge port (84).