Mobile machine with an electric traction motor of a traction drive, an electric pump motor of a hydraulic work system, and fluid cooling

Abstract

A mobile machine, such as an industrial truck, has heat-emitting drive components (K) of a traction drive and a hydraulic work system. The traction drive includes at least one electric traction motor (3) and a traction motor control system (7). The hydraulic work system includes at least one electric pump motor (5) and a pump motor control system (6). At least some of the drive components (K) are located in a cooling circuit. The cooling circuit has a cooling device (1), to which, on the output side, the traction motor (3), the pump motor (5), the traction motor control (7), and the pump motor control system (6) are connected, and which can be connected on the input side, depending on the fluid temperature in a reservoir (9) of the hydraulic work system, to the reservoir (9) or to a return line of the heat-emitting drive components (K).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Additional advantages and details of the invention are explained in greater detail below on the basis of the exemplary embodiment illustrated in the accompanying schematic figures, in which like reference numbers identify like parts throughout.

FIG. 1 is a circuit for a first operating condition of a mobile machine of the invention; and

FIG. 2 is a circuit for a second operating condition of a mobile machine of the invention.

Claims

1. A mobile machine, comprising: heat-emitting drive components of a traction drive and a hydraulic work system, wherein the traction drive comprises at least one electric traction motor and a traction motor control system, wherein the hydraulic work system comprises at least one electric pump motor and a pump motor control system, and wherein at least some of the drive components are located in a cooling circuit that is connected to the hydraulic work system and can be cooled by fluid from the hydraulic work system,wherein the cooling circuit includes a cooling device connected on an output side with the traction motor, the pump motor, the traction motor control, and the pump motor control system, andwherein the cooling device can be selectively connected on an input side, depending on fluid temperature in a reservoir of the hydraulic work system, to the reservoir or to a return line from the heat-emitting drive components.

2. The mobile machine as claimed in claim 1, wherein the control systems of the electric motors are located upstream of the electric motors in a direction of coolant flow.

3. The mobile machine as claimed in claim 1, wherein the pump motor control is located upstream of the traction motor control system in the direction of coolant flow.

4. The mobile machine as claimed in claim 1, wherein the pump motor is located upstream of the traction motor in a direction of coolant flow.

5. The mobile machine as claimed in claim 2, wherein the pump motor is located upstream of the traction motor in a direction of coolant flow.

6. The mobile machine as claimed in claim 1, wherein the traction motor and the pump motor are both located in a drive axle, to which the traction motor control system and the pump motor control system are fastened, with cooling channels machined into the drive axle.

7. The mobile machine as claimed in claim 2, wherein the traction motor and the pump motor are both located in a drive axle, to which the traction motor control system and the pump motor control system are fastened, with cooling channels machined into the drive axle.

8. The mobile machine as claimed in claim 3, wherein the traction motor and the pump motor are both located in a drive axle, to which the traction motor control system and the pump motor control system are fastened, with cooling channels machined into the drive axle.

9. The mobile machine as claimed in claim 4, wherein the traction motor and the pump motor are both located in a drive axle, to which the traction motor control system and the pump motor control system are fastened, with cooling channels machined into the drive axle.

10. The mobile machine as claimed in claim 5, wherein the traction motor and the pump motor are both located in a drive axle, to which the traction motor control system and the pump motor control system are fastened, with cooling channels machined into the drive axle.