Patent ID: 9714667
Date: 2017-07-25
CPC Classifications: B60K,F02N,F15B,Y02T,Y10S

Claim:
1. A hydrostatic hybrid drive device for a hybrid drive train of a vehicle, comprising: a drive motor; a consumer driven by the drive motor; and a hybrid drive device comprising only one hydrostatic displacement machine operated in an open circuit and operable as a pump and a motor in the same direction of rotation and the same direction of flow of a hydraulic fluid; a delivery line connected to an outlet-side delivery side of the hydrostatic displacement machine and connected to a high pressure accumulator device, wherein the hydrostatic displacement machine, when operated as a pump, delivers exclusively into the high pressure accumulator device defining the only consumer supplied by the hydrostatic displacement machine; a first shutoff valve located in the delivery line and operable to permit flow to the high pressure accumulator device; a branch line branching off from the delivery line between the delivery side of the hydrostatic displacement machine and the first shutoff valve and connected with a low pressure accumulator device; an intake line connected to an inlet-side intake side of the hydrostatic displacement machine and connected with the low pressure accumulator device; a second shutoff valve located in the intake line and configured to shutoff the flow to the low pressure accumulator device; a discharge line from the high pressure accumulator device to the intake line and connected between the intake side of the displacement machine and the second shutoff valve; and a valve device configured to actuate the discharge line and the branch line, wherein, when the hydrostatic displacement machine is operated as a pump, the valve device shuts off the discharge line and the branch line and, when the hydrostatic displacement machine is operated as a motor, actuates the discharge line and the branch line to allow a through flow.