Axle Drive Brake Disk Radial Layout and Speed Reduction
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Solution Overview
Problem
The challenge is to design an axle drive for vehicles that incorporates a brake, particularly a parking brake, while maintaining a compact form factor and minimizing installation space, especially in vehicles with limited space, and addressing the issue of high rotational speeds from electric motors causing brake disk vibrations and noise.
Innovation Solution
The axle drive features a parallel configuration of drive and driven shafts with a brake disk positioned at the end of the driven shaft, allowing for a compact design and reduced rotational speed of the brake disk, utilizing a spur gear set for speed reduction and a dry brake configuration to minimize noise and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake with a large diameter brake disk is configured to provide sufficient braking effect, then the braking performance is improved, but the installation space occupied by the axle drive increases
Solution Approach 1:
The brake disk is arranged in the radial direction relative to the driven shaft rather than extending axially, transforming the spatial dimension from axial to radial. This allows the brake disk to have a large diameter for sufficient braking effect while maintaining a compact axial length that fits within limited installation space beneath the vehicle.
2Reliability
If a large diameter brake disk is used to ensure sufficient braking effect, then the braking performance is improved, but vibrations and noise generation increase due to high rotational speeds
Solution Approach 1:
A speed reduction mechanism (gear stage) is introduced as an intermediary between the electric motor and the brake disk. This mediator reduces the rotational speed transmitted to the brake disk while maintaining the torque required for sufficient braking effect, thereby preventing vibrations and noise that would occur at high rotational speeds.
3Area of stationary object
If the number of components is limited to achieve compact design, then the installation space is reduced, but the brake function may be compromised
Solution Approach 1:
The brake system is integrated with the driven shaft and gear stage, merging multiple functions into a compact arrangement. The brake disk is rotationally fixedly connected to the driven shaft, and the brake caliper is mounted on the housing, creating a unified structure that provides complete brake functionality within minimal installation space.
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 enables a compact, space-efficient axle drive with improved acoustic behavior and reduced vibrations, allowing for reliable braking and secure vehicle parking without increasing the axial length, and supports the use of fast-rotating electric motors without noise or instability issues.
Implementation Method 1
the output section of the drive shaft and the input section of the driven shaft are coupled drive-wise to one another via a spur gear set
Implementation Method 2
The brake has a brake caliper that is fastened to an outer side of the housing and that is configured to be able to act on the brake disk in order to be able to reduce a rotational speed of the vehicle axle
Data Source
AI summary
An axle drive for a vehicle includes at least one drivable vehicle axle oriented transversely to a longitudinal direction of the vehicle. A drive shaft extends parallel with the longitudinal direction and receives drive power from an electric motor at an input section and outputs said drive power at an output section. A driven shaft extends parallel with the drive shaft and receives drive power from the output section of the drive shaft at an input section and outputs said drive power to the vehicle axle via a bevel gear arranged at a first end of the driven shaft. A brake, in particular a parking brake, includes a brake disk arranged at a second end of the driven shaft and between the input section of the drive shaft and the input section of the driven shaft with respect to the longitudinal direction.