The permanent latching force at zero power makes BAT ideally suited to a park lock engagement / disengagement actuator.
By utilizing BAT, the park lock can be engaged and disengaged quickly and efficiently. The simple and compact design is harnessed to a park lock mechanism via an actuator rod. This rod acts to engage and disengage a pawl with a geared final drive mounted park brake. Once engaged, no energy is required to hold the brake in place. With careful design of the detailed system geometry, complex dynamic models have been used to simulate the park brake performance. These models contain contact stiffness, damping and friction during contacts. Effects of tolerances are included and can be used for production robustness to ensure function is within desired range even at worst case production tolerances. These tools have been correlated against actual test data from hardware.
The benefits of the optimised system design include:
1. Reduced package size
2. Reduced actuation and pull out forces
3. Improved durability
4. Accurate engagement speeds
5. Small actuator requirements
6. Reduced operating current
7.Simple control interface to TCU
Camcon has developed a typical Park Lock actuator, designed for a heavy passenger vehicle, through to the point of production intent. An outline specification for this actuator is shown below:
The actuator technology is scalable to suit the customers specification. Reducing the force required will result in a smaller, lighter and cheaper actuator. Spring forces can be selected for different force profiles and different stroke length can be specified.