Chassis Actuator Preloading for Self-Locking Rear Axle Steering
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Solution Overview
Problem
Existing chassis actuators for rear axle steering systems in motor vehicles face challenges in achieving efficient self-locking operation while minimizing friction losses, particularly in multi-stage transmission assemblies.
Innovation Solution
The chassis actuator incorporates a rotational-linear transmission with an adjustable preloading device that loads the axial bearing with an axial force, achieving self-locking and efficiency between 35% and 45% through a combination of a continuously variable transmission and a planetary roller gear system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission assembly is designed to be self-locking with high axial preloading force, then the reliability of the locked condition is improved, but the friction losses increase and efficiency decreases
Solution Approach 1:
The patent applies parameter changes by making the axial preloading force adjustable rather than fixed. The preloading device allows the axial force on the input-side element to be optimized to achieve the desired efficiency range (35-45%) while maintaining reliable self-locking operation. This resolves the contradiction by finding the optimal parameter value that balances reliability and energy loss.
2Stability of the object's composition
If the axial preloading force is increased to ensure self-locking, then the locked condition stability is improved, but the friction losses in the transmission increase
Solution Approach 1:
The patent applies dynamics by making the preloading force adjustable rather than static. The adjustable preloading device allows the system to adapt the axial force on the input-side element to achieve optimal performance, balancing the stability of the locked condition with acceptable friction losses and efficiency (35-45% range).
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 ensures reliable self-locking operation with controlled efficiency, reducing friction losses and maintaining the actuator in a locked condition, thereby enhancing the overall performance of the rear axle steering system.
Implementation Method 1
The rotational-linear transmission, possibly in combination with a further upstream transmission, is self-lockingly set by the axial force
Implementation Method 2
an adjustable preloading device is provided, which loads the axial bearing with an axial force
Implementation Method 3
a planetary roller gear system
Implementation Method 4
The chassis actuator comprises an electric motor and a transmission assembly acted upon by the electric motor, wherein the transmission assembly comprises a continuously variable transmission and a rotational-linear transmission connected downstream of the continuously variable transmission
Data Source
AI summary
A chassis actuator (1), in particular for a rear axle steering system, includes a rotational-linear transmission (5) which is provided for coupling, on the output side, to a chassis element, wherein a rotatable, input-side element (9) of the transmission (5) is mounted in a housing (13) by means of at least one axial bearing (16, 17). The transmission (5) is self-lockingly set by means of an adjustable preloading device (21), which loads the axial bearing (16, 17) with an axial force.