Oil Pump Suction Opening Curved Surface Noise Reduction
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Solution Overview
Problem
The existing oil pump designs generate noise due to the interference between the edge portion of the suction opening portion and the vanes, leading to vane engagement with the housing and cam ring.
Innovation Solution
The oil pump incorporates a termination end portion of the suction opening with a termination end inner circumference, a termination end outer circumference positioned radially outside the cam profile surface, and a curved surface connecting these, ensuring the radial length of the vane confronting the suction opening is shorter than half of its entire length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the suction opening portion has a simple structure, then the manufacturing is easy, but the vanes fall into the suction opening causing noise
Solution Approach 1:
The suction opening portion is designed with a curved surface that extends from the inner circumference toward the outer circumference, creating a smooth transition zone. This curved geometry prevents the vanes from falling into the suction opening by eliminating sharp edges and corners, thereby suppressing noise while maintaining ease of manufacture through a single integrated structure.
2Object-affected harmful factors
If the radial length of the vane confronting the suction opening is reduced, then the noise is suppressed, but the oil supply to the operation chamber may be insufficient
Solution Approach 1:
The suction opening portion is divided into multiple regions: an inner circumference region, an outer circumference region, and a curved surface region connecting them. This segmentation allows the vane to have different functional zones - a shorter radial length in the suction opening region to prevent noise, while maintaining adequate overall length for proper oil supply function.
Solution Approach 2:
The vane is designed with non-uniform properties along its length. The radial length confronting the suction opening is specifically reduced to suppress noise, while other portions of the vane maintain sufficient length to ensure proper oil supply to the operation chamber. This local differentiation resolves the contradiction between noise suppression and productivity.
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 design effectively suppresses noise generated by vane falling into the suction opening by reducing the caught amount of the vane, thereby minimizing abutment noise with the cam ring and housing.
Implementation Method 1
the termination end portion of the suction opening includes a termination end inner circumference portion, a termination end outer circumference portion positioned radially outside the cam profile surface, and a curved surface portion connecting the termination end inner circumference portion and the termination end outer circumference portion
Data Source
AI summary
An oil pump includes: a housing; a pump constituting section; a discharge opening portion; and a suction opening portion which includes a termination end portion including a termination end inner circumference portion, a termination end outer circumference portion provided radially outside the termination end inner circumference portion, and positioned radially outside the cam profile surface, a curved surface portion connecting the termination end inner circumference portion and the termination end outer circumference portion, and a cross portion at which the curved surface portion is crossed with the cam profile surface, and which is positioned at a position at which a radial length of a vane of the plurality of the vanes that confronts the suction opening portion is shorter than a half of an entire length of the vane.