Drive Unit Brake Layout for Stall Torque and Rotational Testing
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Solution Overview
Problem
Existing drive train test benches require time-consuming reconfiguration for Stall Torque tests or have narrow air gaps that interfere with rotational measurements.
Innovation Solution
A drive unit with a brake system featuring a radially positioned brake pad as the second friction partner, allowing for torque measurements without rotation and maintaining measurement accuracy during rotation by ensuring a stable, non-co-rotating brake frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a brake system with a radially positioned brake pad is used for torque measurements, then Stall Torque tests can be performed efficiently without rotation, but the brake system may interfere with rotational measurements due to its positioning
Solution Approach 1:
The brake system is designed with a non-co-rotating brake frame that remains stationary while the clutch and drive train components rotate. This dynamic configuration allows the brake pads to engage with the radially outside portion of the clutch for Stall Torque measurements without interfering with rotational measurements, as the brake frame itself does not rotate with the drivetrain components.
2Adaptability or versatility
If the brake frame co-rotates with the clutch, then the brake system can apply torque during rotation, but vibration interference increases and measurement accuracy decreases
Solution Approach 1:
The brake frame is explicitly designed to remain non-co-rotating while the clutch and drive train components rotate. This creates a stationary reference frame for the brake system, eliminating vibration interference that would occur if the brake frame rotated with the drivetrain. The system achieves versatility by allowing both Stall Torque tests (with brake engagement) and rotational measurements (with brake disengaged) without compromise.
3Adaptability or versatility
If existing test benches are reconfigured for Stall Torque tests, then torque measurements without rotation can be performed, but the reconfiguration process is time-consuming
Solution Approach 1:
The drive unit is designed with a universal brake system that can perform both Stall Torque tests and rotational measurements without requiring reconfiguration. The radially positioned brake pads on a non-co-rotating frame create a multi-functional system that accommodates different test types through control system adjustments rather than physical reconfiguration, eliminating time losses associated with changing test setups.
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
Enables efficient torque measurements without rotation and minimizes vibration interference, enhancing test bench flexibility and accuracy.
Implementation Method 1
a brake whose first friction partner is a radially outside portion of the clutch and whose second friction partner is at least one brake pad
Data Source
AI summary
A drive unit is provided for a drive train test bench for testing a drive train of a motor vehicle. The drive unit has a frame, an electric motor with a motor shaft, a clutch, and a drive output shaft, where the electric motor is arranged on the frame and the drive output shaft is mounted to rotate in a bearing of the frame. The motor shaft can be connected rotationally fixed to the drive output shaft by means of the clutch. The drive unit also has a brake having a first friction partner that is a radial outside of the clutch and having a second friction partner that is at least one brake pad. The invention also relates to a corresponding drive train test bench.