Integrated Parking Gear System for Vehicle Drive Axles
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Solution Overview
Problem
Existing vehicle parking systems require multiple components and suffer from inefficiencies, including increased cost, size, and the inability to simultaneously regulate left and right wheel rotations due to phase shifts in parking gears, which can cause vehicle movement during parking.
Innovation Solution
A driving system with a single rotation regulation unit that engages both left and right parking gears, featuring gears with different tooth tip diameters and the same pitch and bottom diameters, disposed adjacent to each other, to reduce component count, size, and backlash, and maintain the vehicle in a stopped state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate parking devices are provided for left and right wheels, then each wheel can be regulated independently, but the number of components increases, cost increases, and size increases
Solution Approach 1:
The patent combines two separate parking devices into a single integrated parking device that can regulate both left and right wheel rotations simultaneously. The single parking device includes a housing, a parking pawl with engagement portions for both parking gears, and actuation mechanisms integrated within one unit, thereby reducing component count while maintaining regulation functionality.
Solution Approach 2:
The single parking device is designed to perform multiple functions: it can engage with both left and right parking gears, regulate both wheels simultaneously, and respond to actuation signals to control parking for both sides. This multi-functional design eliminates the need for separate dedicated parking devices for each wheel.
2Reliability
If separate parking devices are provided for left and right wheels, then each wheel can be regulated independently, but the overall size of the parking system increases
Solution Approach 1:
The patent combines two separate parking devices into a single integrated parking device that can regulate both left and right wheel rotations simultaneously. The single parking device includes a housing, a parking pawl with engagement portions for both parking gears, and actuation mechanisms integrated within one unit, thereby reducing component count while maintaining regulation functionality.
Solution Approach 2:
The parking device employs a nested structure where the left and right parking gears are arranged concentrically or adjacently within a single housing. The parking pawl is positioned to engage with both gears through strategic placement of engagement portions, creating a compact nested arrangement that minimizes spatial footprint.
3Ease of operation
If parking gears have different tooth configurations, then engagement can be achieved, but backlash increases causing vehicle movement during parking
Solution Approach 1:
The patent applies different local qualities to the left and right parking gears by providing different numbers of teeth or different tooth pitch configurations tailored to each wheel's requirements. This allows optimization of engagement characteristics for each side while maintaining appropriate backlash control through the single parking device's dual engagement capability.
Solution Approach 2:
The patent varies parameters such as the number of teeth, tooth pitch, or module dimensions between left and right parking gears to achieve optimal engagement. By adjusting these parameters locally for each gear while using a single parking device with corresponding engagement portions, the system achieves proper fit and minimizes backlash that would cause vehicle movement.
Data Source
AI summary
A driving system includes: a left electric motor which drives a left wheel of a vehicle; a first parking gear which is provided on a left power transmission path between the left electric motor and the left wheel; a right electric motor which drives a right wheel of the vehicle; a second parking gear which is provided on a right power transmission path between the right electric motor and the right wheel; and a rotation regulation unit that engages with both of the first parking gear and the second parking gear. The first parking gear and the second parking gear have different tooth tip diameters.