Helical Spur Gear Thrust Collar for Axial Load Compensation
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Solution Overview
Problem
Helical gears in gear transmissions induce additional axial loads, leading to mechanical weaknesses and efficiency losses due to the need for larger and more costly bearing systems, and existing rotation prevention mechanisms in spur gear drives mechanically weaken the thrust collar.
Innovation Solution
A toothing arrangement with a helical-cut spur gear and a thrust collar featuring internal gearing and a rotation prevention mechanism that moves radially from the inner to the outer region, providing a form-locking interlock position to secure the thrust collar and minimize axial play, thus preventing rotation without mechanical weakening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin is guided radially through the thrust collar to prevent rotation, then the thrust collar is secured against rotation, but the thrust collar is mechanically weakened
Solution Approach 1:
The invention extracts the pin from the thrust collar and relocates it to the gearwheel, thereby preventing rotation of the thrust collar without mechanically weakening the thrust collar itself. The pin is now guided in the gearwheel and engages with the thrust collar's groove, transferring the rotation prevention function to the gearwheel structure.
Solution Approach 2:
The invention introduces the groove in the thrust collar as an intermediary element that mediates between the pin (in the gearwheel) and the thrust collar. The groove receives the pin and prevents rotation through this intermediate engagement, rather than requiring the pin to pass directly through the thrust collar material.
2Reliability
If the pin is dimensioned to absorb torsional forces, then rotation prevention is effective, but the structural complexity and cost increase
Solution Approach 1:
The gearwheel serves itself by providing the structural support for the pin that prevents thrust collar rotation. The gearwheel's existing structure and material properties are utilized to absorb torsional forces, rather than requiring the thrust collar to be specially dimensioned or reinforced for this purpose.
3Object-affected harmful factors
If helical gears are used to reduce acoustic noise, then acoustic performance improves, but axial loads increase requiring larger bearings
Solution Approach 1:
The invention extracts the axial load support function from the bearing system and relocates it to the thrust collar. The thrust collar with its two races is positioned in the circumferential groove of the gearwheel, directly supporting axial loads at the meshing toothing location, thereby eliminating the need for oversized bearings.
Solution Approach 2:
The thrust collar acts as an intermediary element between the meshing toothing and the gearwheel shaft, directly supporting axial loads at the source rather than transmitting them through the bearing system. This intermediate support structure reduces the axial load burden on the bearings.
Data Source
AI summary
A toothing arrangement (1) includes at least one first helical-cut spur gear (3) and a second helical-cut spur gear (4), which form a common meshing toothing, and as least one thrust collar (7) with two races (8, 9) for axial load compensation on both sides in the region of the meshing toothing. The annular thrust collar (7) includes an internal gearing (10), which, in the mounted state, is supported in a circumferential groove (11) interrupting the tooth system (5) of the first spur gear (3). At least one rotation prevention means is associated with the thrust collar (7). The rotation prevention means is movable from a radially inner region to a radially outer region of the first spur gear (3) into an interlock position. A transmission may include the toothing arrangement.