Patent ID: 6688419
Filing Date: 2004-02-10
Classification: B60K,E02F,F16H

Abstract:
Hydraulic driving device for a vehicle, having a pressure source (7) generating a predetermined pressure for maintaining the operating pressure of a hydraulic motor (5), a braking cylinder (18) with a spring chamber (20) comprising a spring arrangement (19) for operating a braking arrangement (17) and a release chamber (21) that can be acted upon by pressurised fluid from the pressure source (7) against the force of the spring arrangement (19) with the purpose of retaining the braking device (17) in its release position, and having a braking control valve (22) that, in a release position, releases a flow from the pressure source (7) to the release chamber (21), characterised in that a leakage fluid outlet opening of the hydraulic motor (5) and a valve arrangement (25) are connected with the release chamber (21), the valve arrangement maintaining, in the release position of the braking control valve (22), a pressure in the release chamber (21) corresponding at least to the release pressure of the braking device (17).