Abstract: A track tension system including a hydraulic cylinder coupled between a drive frame and idler of a track system, an accumulator and a hydraulic valve that controls flow between the cylinder and accumulator. The cylinder extends and retracts to change the distance between the drive frame and idler which increases and decreases, respectively, tension on the track system. The hydraulic valve can be opened to allow flow between the cylinder and accumulator, and closed to block flow between the cylinder and accumulator. Control factors can be monitored to control valve position. An overload pressure relief can allow flow between the cylinder and accumulator when the hydraulic valve is closed and pressure in the cylinder reaches overload pressure. An orifice can allow constricted flow between the cylinder and accumulator when the hydraulic valve is closed. A check valve can connect the track tension system to a vehicle hydraulic system.

Abstract: A cover assembly for a vehicle airbag containing decorative material. The cover assembly includes a resilient polymeric cover and an insert is located on the upper surface of the cover. The outer peripheral portion of the insert is imbedded in the cover while the central portion of the insert which bears the decorative material is exposed. The peripheral portion of the insert includes at least one opening and the polymeric material of the cover is disposed in the opening to mechanically interlock the insert to the cover. The cover is designed to split along a line of weakness on the deployment of the airbag and the line is located so that the insert is positioned wholly within one of the split cover sections.