Seals are one of three main components where Delta motors offer improved reliability; drives and bearings are the others. Drive life is extended through a combination of advanced technology and a simplified design. Delta motors feature a two-zone design, where oil enters one zone and exits from another. While other hydraulic motors include a case drain port as a third zone, the Delta motor architecture makes the third zone unnecessary. With fewer components and potential failure points, the Delta design improves reliability at the outset and offers more trouble-free operation throughout its life.
A proprietary drive design reduces wear, preventing drive chip fragments from flowing into pump. The drive design improves drive angles by mimicking the eccentric motion of the star-shaped rotor, as the star rotates and oscillates. This helps translate the torque to the pure rotation of the output shaft.
The Delta architecture also locates the valve in the middle portion of the motor, as shown in Figure 1. This more optimally balances the length of the motor with life of the drive. By having the valve in the middle of the motor instead of the end, the motor’s overall length is reduced without compromising the strength of the drive. Competing designs, with the valve in the rear of the motor, have a shorter drive which increases stress at high torques, and route flow through a hole in the middle of the drive. The Delta’s solid drive design also allows for higher strength and more uniform heat treatment during manufacturing.