Transmission

Market demand led Camcon to focus on a couple of initial transmission applications: Park Lock and Drive Line Disconnect.
Through an internally funded program these products have been moved from concept to Production Intent samples, which are now accumulating mileage on vehicle with a reputable OEM.
Camcon is looking for Tier 1 manufacturers to bring these products to market.

Park Lock

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

Park Lock - key features

  • Design scaleable for customer application
  • Compact packaging
  • Modular electronics possible for remote locations
  • Linear actuation
  • Position sensing at each end to relay actuation achieved or supply error code to TCU/VCU
  • Plug and play requires only on/off signal from TCU/VCU 
  • Zero power required to hold each end position
  • Tuneable latching force

Park Lock - scaleable design

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.

Park Lock - design verification

The following design verification tests have been undertaken:
  • Characterisation test - function and engagement speed
  • Durability
  • Water ingress
  • Dust ingress
  • Oil ingress
  • Salt spray
  • Thermal/humidity
  • EMC
  • Vehicle testing
  • Vibration test
Safety considerations
  • DFMEA has been undertaken and reviewed during the development
  • Park brake system using BAT actuator reviewed to functional safety and rated as ASIL B

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