Oil Pump Driven Sprocket Support Using Housing Projections
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Solution Overview
Problem
Conventional oil pumps require costly ball bearings and complex assembly steps to radially and axially support driven sprockets, increasing costs and assembly complexity.
Innovation Solution
The oil pump design incorporates a supporting hole in the pump housing to rotatably support the rotation shaft, eliminating the need for ball bearings and snap rings by using case and cover projections to restrict axial movement, thus reducing costs and assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball bearing is used to support the driven sprocket radially, then the reliability of radial support is improved, but the cost increases
Solution Approach 1:
The invention extracts and eliminates the ball bearing component from the driven sprocket support system. Instead of using a ball bearing, the patent employs a simple bushing (22) that is press-fitted into the pump cover (2), significantly reducing component count and manufacturing cost while maintaining adequate radial support functionality for the driven sprocket (13).
Solution Approach 2:
The invention replaces the expensive ball bearing with a simple, inexpensive bushing (22) that can be easily manufactured and installed. This bushing provides sufficient radial support for the driven sprocket without requiring the complex precision engineering of ball bearings, thereby reducing manufacturing cost while maintaining functional reliability.
2Reliability
If a ball bearing and snap ring are used to support the driven sprocket, then the radial and axial support is improved, but the assembly complexity increases
Solution Approach 1:
The invention merges the radial support function and axial positioning function into a single integrated structure. The bushing (22) provides radial support while the pump cover (2) with its flange portion (2a) and the driven sprocket (13) itself work together to provide axial positioning, eliminating the need for separate ball bearings and snap rings, thus simplifying the overall assembly.
Solution Approach 2:
The invention extracts and removes the snap ring component from the assembly. Axial positioning is achieved through the interaction between the pump cover flange portion (2a), the driven sprocket (13), and the bushing (22), eliminating the need for a separate snap ring and reducing assembly complexity.
3Reliability
If a ball bearing is fixed to the rotation shaft, then the radial support function is improved, but the number of assembly steps increases
Solution Approach 1:
The invention extracts the ball bearing from the rotation shaft assembly process. Instead of fixing a ball bearing to the rotation shaft (11), the patent uses a bushing (22) that is press-fitted into the pump cover (2), eliminating the step of attaching ball bearings to the rotation shaft and reducing assembly complexity.
Data Source
AI summary
A driven sprocket of a chain driving mechanism is fixed to a rotation shaft between a front pump cover and a converter housing, and the rotation shaft is supported by a first supporting hole of the front pump cover and a second supporting hole of a rear pump cover. The movement of the driven sprocket in such a direction that it approaches the converter housing is restricted by a case side projection formed on the converter housing, and the movement of the driven sprocket in such a direction that it separates from the converter housing is restricted by a cover side projection formed on a bottom surface of the second supporting hole.