JPS - Rotary Actuator
When developing the R5500 sawing unit, JPS have also developed a completely new hydraulic rotary actuator that replaces the traditional saw bar cylinder. The actuator consists of only three parts and therefore offers maximum reliability while the maintenance requirements are minimal. The unique design is the central part of the R5500 concept as it serves as the mount for the saw unit in the harvester head. The motor is located on one side, and the bar mount on the other. This means that they can be dismantled independently. The motor can be left untouched when replacing the bar holder, and vice versa to reduce down time.
The rotary actuator features hydrostatic bearings to enable unhindered operation on a fine oil film, giving it close to infinite bearing life. With integrated dampening at the end of travel in each direction, mechanical stress on the bar and mount has been minimized further.
The JPS rotary actuator features uniform torque throughout the full movement while delivering high power in both directions. The harvester head hydraulics and control system controls the saw bar pressure, speed and return bar speed.
All hose connections are safely protected in the harvester head frame. There are no hoses or cables in the saw box at risk of being damaged by twigs, underbrush or a thrown chain. The JPS rotary actuator has no external moving parts so its unaffected by ice, hardened snow and miscellaneous debris. For the harvester operator, this means increased productivity thanks to fewer interruptions to clear the saw box. Additionally, the absence of a cutting cylinder obviously means there is no cylinder rod can be bent as a result of undue loads or external effects.
The smart design of the JPS rotary actuator and its lack of protruding parts make it easy to mount in different harvester heads. As standard, the actuator has a 90° operating angle, but this can be extended to 135° for special applications. The rotary actuator is completely sealed against water and dust. JPS rotary actuators feature an integrated swivel joint with dedicated lubricant and hydraulic oil channels.
The saw motor is mounted as a separate unit, therefore there is no need of any oil channel or swivel joints, which simplifies and speeds up motor replacements. The JPS rotary actuators have been designed for standard motors to allow quick access to a new replacement in cases of unfortunate motor breakdown.
- Uniform torque
- Integrated damping at end limits of travel
- Hydrostatic bearings
- No external lubrication required
- Unaffected by snow, ice and miscellaneous debris
- Integrated swivel joint feature for saw bar lube
- No external hoses or connections