Planetary Gearwheel Recess Layout for Compact Spring Ring Torque
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Solution Overview
Problem
Existing gearwheels for planetary gear systems in roll stabilizers have a large axial thickness due to ridges on the spur gears, requiring extra axial space and substantial material machining, which complicates production and increases size.
Innovation Solution
The gearwheel design incorporates recesses on the spur gears to accommodate the spring ring, reducing the axial size by allowing partial or complete accommodation of the spring ring, thereby reducing the gearwheel's axial extension and increasing the useful tooth flank width for high torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ridges are formed on the spur gears to support the spring ring, then the spring ring can be properly positioned and exert restoring torque, but the axial thickness of the gearwheel increases and substantial material machining is required
Solution Approach 1:
The spring ring is nested within the recess formed in the spur gear, allowing the spring ring to be positioned and supported without increasing the axial thickness of the gearwheel. The recess accommodates the spring ring in a space that would otherwise be occupied by gear material, eliminating the need for protruding ridges.
Solution Approach 2:
Instead of supporting the spring ring axially through protruding ridges, the invention supports the spring ring radially through a circumferential ridge that extends into the recess. This dimensional change from axial to radial support reduces the axial thickness while maintaining proper spring ring positioning and torque transmission capability.
2Reliability
If ridges are formed on the spur gears, then the spring ring can be supported, but substantial material must be machined away which complicates production
Solution Approach 1:
The recess is formed by removing material only from the radial face of the spur gear, creating a cavity that nests the spring ring. This requires significantly less material removal compared to forming axial ridges, simplifying the manufacturing process while maintaining spring ring support functionality.
Solution Approach 2:
The spur gear is segmented into functional zones: the tooth portion for torque transmission and the radial face portion containing the recess for spring ring accommodation. This segmentation allows each zone to be optimized independently, with the recess being a simple radial cut that does not interfere with tooth formation.
3Reliability
If the spring ring is arranged axially between the two spur gears, then it can exert restoring torque, but the axial extension of the gearwheel increases
Solution Approach 1:
The spring ring is repositioned from an axial arrangement between the spur gears to a radial arrangement within a recess in one of the spur gears. This dimensional change allows the spring ring to maintain its restoring torque function while eliminating the additional axial extension that would result from placing it between the gears.
Solution Approach 2:
The spring ring is merged with the spur gear structure by positioning it within the recess of the spur gear. This integration allows the spring ring to be supported by the spur gear itself rather than requiring separate axial spacing, thereby maintaining the restoring torque function while reducing overall axial extension.
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
The reduced axial size and increased tooth flank width enhance the gearwheel's ability to transmit high torques while minimizing production complexity and material usage, resulting in a more compact and efficient design.
Implementation Method 1
the spring ring can be stressed so that it exerts a restoring torque on the spur gears
Data Source
AI summary
A gearwheel for a gear system for a planetary gear system of a chassis assistance system. The gearwheel is divided into at least a first spur gear and a second spur gear which are spaced apart from one another along a common rotational axis. The gearwheel has, in addition, an open spring ring with a first end, which is supported in a circumferential direction against the first spur gear, and a second end, which is supported in the direction opposite to the circumferential direction against the second spur gear in such manner that by rotating the spur gears, relative to one another about the common rotational axis, the spring ring can be stressed in order to exert a restoring torque on the spur gears. A recess is formed on at least one of the spur gears for holding part of the spring ring.