Patent Number: 6,305,762

Title: Valve assembly for controlling actuation of an actuator of a track tensioning system

Abstract: A valve assembly for controlling actuation of an actuator of a track tensioning system for adjusting tension on a drive track chain includes a valve housing defining (i) a master chamber, (ii) a slave chamber, (iii) a fluid passage which fluidly couples the master chamber to the slave chamber, and (iv) a fluid outlet which fluidly couples the slave chamber to the actuator. The valve assembly also includes a master valve member positioned within the master chamber. The master valve member (i) isolates the master chamber from the slave chamber when the master valve member is positioned in a first master position, and (ii) places the master chamber in fluid communication with the slave chamber when the master valve member is positioned in a second master position. The valve assembly further includes a slave piston positioned within the slave chamber, the slave piston (i) isolates the fluid outlet from the slave chamber when the slave piston is positioned in a first slave position, and (ii) places the fluid outlet in fluid communication with the slave chamber when the slave piston is positioned in a second slave position. Movement of the master valve member from the first master position to the second master position causes movement of the slave piston from the first slave position to the second slave position. Movement of the slave piston from the first slave position to the second slave position causes actuation of the actuator, whereby tension on the drive track chain is adjusted by the actuator.

Inventors: Oertley; Thomas E. (Dunlap, IL)

Assignee: Caterpillar Inc.

International Classification: B62D 55/30 (20060101); B62D 55/06 (20060101); B62D 55/08 (20060101); B62D 55/104 (20060101); B62D 55/00 (20060101); B62D 055/104 ()

Expiration Date: 10/23/2018