Angle Drive Pinion Positioning in Power Wrenches
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Solution Overview
Problem
Angle type power wrenches experience variations in output torque due to incorrect gear teeth engagement between the drive pinion and output shaft bevel gear, caused by an inaccurate axial position of the drive pinion and a less rigid drive pinion bearing support, leading to mechanical wear and strain.
Innovation Solution
An angle type power wrench with an improved drive pinion bearing arrangement, featuring a bearing support sleeve with annular guide surfaces and a thread connection for precise radial and axial positioning of the drive pinion, utilizing an angle contact ball bearing to counteract forces during torque transfer, and a lock mechanism for setting the pinion's axial position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the drive pinion axial position is not accurately controlled, then the bearing support structure can be simpler, but the gear teeth engagement becomes incorrect causing torque variations
Solution Approach 1:
The bearing support sleeve is made adjustable rather than fixed, allowing dynamic positioning of the drive pinion along the axial direction. The thread connection enables the sleeve to be moved to different axial positions, and the lock mechanism secures it at the desired position, thus achieving accurate axial positioning while maintaining structural simplicity.
Solution Approach 2:
The axial position parameter of the drive pinion is made variable through the adjustable bearing support sleeve. By changing the axial position parameter via the thread connection mechanism, optimal gear engagement can be achieved without requiring complex pre-positioning or tolerance stacking.
2Stability of the object's composition
If the drive pinion bearing support is less rigid, then the structure can be simpler, but the drive pinion experiences tilting and axial displacement causing incorrect gear engagement
Solution Approach 1:
The bearing support function is segmented into two independent components: the bearing support sleeve that provides radial support and positioning, and the lock mechanism that provides axial stabilization. This segmentation allows each component to perform its specific function effectively without requiring an overly complex integrated structure.
Solution Approach 2:
The bearing support sleeve acts as an intermediary element between the drive pinion and the housing. It provides the necessary radial support and positional accuracy, while the lock mechanism mediates the axial positioning. This intermediary structure achieves stable pinion positioning without directly complicating the overall system.
3Reliability
If the drive pinion axial position varies, then the structure can be simpler without adjustment mechanisms, but the output torque variations increase
Solution Approach 1:
The bearing support sleeve is designed to be adjustable rather than fixed, allowing the axial position of the drive pinion to be dynamically optimized. The thread connection enables precise axial positioning, and the lock mechanism maintains this position during operation, ensuring consistent output torque while adding minimal structural complexity.
4Ease of manufacture
If the gear teeth engagement is incorrect, then the assembly can be faster, but the mechanical wear of the angle drive increases
Solution Approach 1:
The bearing support sleeve with its adjustment and lock mechanisms enables preliminary positioning and securing of the drive pinion before final assembly. This preliminary action ensures correct gear engagement is established during assembly, preventing premature wear and extending the service life of the angle drive while maintaining efficient assembly through the straightforward adjustment-lock sequence.
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 ensures accurate axial positioning of the drive pinion, reducing torque variations, minimizing mechanical strain, and extending the service life of the angle drive by maintaining optimal gear engagement and reducing wear.
Implementation Method 1
a bearing support sleeve supporting a forward drive pinion bearing and a rear drive pinion bearing
Implementation Method 2
forward drive pinion bearing is an angle contact ball bearing
Implementation Method 3
said threaded rear end portion of the bearing support sleeve is elastically expandable to form a friction lock against rotation
Implementation Method 4
form a friction lock against rotation
Data Source
AI summary
An angle type power wrench includes a housing, a motor, an output shaft and an angle drive connecting the motor to the output shaft. The angle drive includes a drive pinion provided with a forward gear head, and a bevel gear provided on the output shaft and engaged by the drive pinion gear head. The drive pinion is surrounded by a bearing support sleeve supporting a forward drive pinion bearing and a rear drive pinion bearing axially spaced from the forward drive pinion bearing. The forward drive pinion bearing includes an inner ball race at a forward end of the drive pinion at or very close to the gear head, and an outer ball race at a forward end of the bearing support sleeve wherein the bearing support sleeve is connected to the housing via an adjustment connection adapted to enabling adjustment of an axial position of the drive pinion.