Motor Vehicle Transmission Nested Brake Clutch Axial Space Reduction
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Solution Overview
Problem
There is a constant demand for reducing the structural space requirement of motor vehicle transmissions, particularly in electrically driveable vehicles, where existing designs are inefficient in minimizing axial and radial space usage.
Innovation Solution
The motor vehicle transmission design incorporates a planetary transmission with a brake and clutch that overlap in a radial or axial direction, allowing for a compact arrangement that saves structural space by positioning the brake and clutch nested within each other, enabling the electric machine's power to be introduced and outputted on the same axial side with reduced radial and axial space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the brake and clutch are arranged in nested fashion one inside the other, then axial structural space is reduced, but the device complexity increases
Solution Approach 1:
The brake and clutch are arranged in nested fashion one inside the other, with the brake positioned radially outward and the clutch positioned radially inward. This nesting arrangement allows both components to occupy the same axial space, significantly reducing the axial structural space requirement of the motor vehicle transmission while maintaining the functional independence of each component.
Solution Approach 2:
The patent transitions from a conventional axial arrangement of brake and clutch to a radial arrangement where the brake is positioned radially outward and the clutch radially inward. This dimensional change from axial stacking to radial nesting reduces axial space occupation while distributing components in the radial dimension, thereby resolving the space-complexity contradiction.
2Area of moving object
If the brake and clutch and actuator arrangement are concentrated at one axial side, then radial structural space is reduced, but the device complexity increases
Solution Approach 1:
The brake, clutch, and their respective actuator arrangements are merged and concentrated at one axial side of the transmission, specifically at the axial side opposite to where power is introduced. This consolidation allows all these components to share a common space, reducing the radial structural space footprint while the nested radial arrangement further compacts the overall device.
Solution Approach 2:
The common axial side location serves multiple functions: it houses the brake, the clutch, and both actuator arrangements, making this region a multi-functional zone. This universal positioning optimizes space utilization by eliminating the need for separate distributed locations for each component, thereby reducing radial structural space while managing complexity through functional integration.
3Adaptability or versatility
If the sun gear is immobilized by the brake with the static housing, then transmission ratio variation is enabled, but the reliability risk increases due to potential inadvertent propulsion
Solution Approach 1:
The brake acts as an intermediary component between the sun gear and the static housing, providing selective immobilization of the sun gear to enable transmission ratio variation. The clutch serves as another intermediary that can rotationally conjointly connect the sun gear to the internal gear. These intermediary components allow controlled engagement and disengagement, enabling transmission ratio changes while providing mechanical pathways to prevent inadvertent propulsion through proper design of the engagement mechanisms.
Data Source
AI summary
A motor vehicle transmission for coupling an electric machine to a drivetrain of an electrically driveable motor vehicle. The motor vehicle transmission includes a planetary transmission for converting a torque that is introducible by the electric machine. An internal gear of the planetary transmission has an input toothed gear for forming a spur gear stage with a drive shaft of the electric machine. A brake immobilizes a sun gear of the planetary transmission with a static housing. A clutch rotationally conjointly connects the sun gear to the internal gear. The brake and the clutch at least partially overlap as viewed in a radial or axial direction. By virtue of the overlap, it is possible for axial and radial structural space, respectively, to be saved, such that a motor vehicle transmission with a small structural space requirement is made possible.