Crane superstructure drive device

Abstract

The invention relates to a drive device for supplying power to multiple engine pumps (4, 5), provided in the superstructure (3) of a mobile crane for superstructure functions, by way of a drive motor (2) arranged in the undercarriage (1) of the mobile crane, comprising a hydraulic motor (7) which is arranged in the superstructure (3) and hydraulically driven by the drive motor (2) and which comprises a first mechanical output which couples at least one first engine pump (4) to the hydraulic motor (7) and a second mechanical output which couples at least one second engine pump (5) to the hydraulic motor (7). The invention also relates to a mobile crane comprising this drive device.

Claims

1. A drive device for supplying power to multiple engine pumps, provided in a superstructure of a mobile crane for superstructure functions, by way of a drive motor arranged in the undercarriage of the mobile crane, the drive device comprising: a hydraulic motor which is arranged in the superstructure and hydraulically driven by the drive motor and which comprises a first mechanical output which couples at least one first engine pump to the hydraulic motor and a second mechanical output which couples at least one second engine pump to the hydraulic motor.

2. The drive device according to claim 1, hydraulic motor is driven via an open or closed hydraulic circuit.

3. The drive device according to claim 1, wherein one or more hydraulic pumps are provided for driving the hydraulic motor.

4. The drive device according to claim 1, wherein an engine pump is coupled directly to the hydraulic motor via a transmission member at the first output and/or at the second output.

5. The drive device according to claim 1, wherein a transfer gearbox is coupled directly to the hydraulic motor via a transmission member at the first output and/or at the second output, and in turn comprises at least two outputs.

6. The drive device according to claim 5, wherein the at least two outputs of the transfer gearbox are arranged coaxially with each other.

7. The drive device according to claim 1, comprising at least one engine pump group which is coupled to the hydraulic motor via a common output of the hydraulic motor or transfer gearbox and comprises at least two engine pumps.

8. The drive device according to claim 7, wherein the engine pump within a group which is respectively arranged nearer the output provides a drive shaft for driving the engine pump following it.

9. The drive device according to claim 7, wherein the engine pumps within a group are coupled to each other such that said engine pumps coupled to the hydraulic motor are operated at the same rotary speed.

10. The drive device according to claim 7, wherein the engine pump within a group which is respectively arranged nearer the output exhibits a higher power uptake than the engine pump following it.

11. The drive device according to claim 7, wherein all of the engine pumps within a group supply the respective units performing superstructure functions with power either via an open hydraulic circuit or via a closed hydraulic circuit.

12. The drive device according to claim 8, wherein the at least one engine pump group comprises two engine pump groups, wherein the drive shafts of the engine pumps within a group which are respectively arranged nearest the output are arranged coaxially.

13. The drive device according to claim 1, wherein the first and second output are arranged coaxially on opposite sides of the hydraulic motor.

14. The drive device according to claim 1, further comprising a device which detects the rotary speed of an output.

15. A mobile crane which comprises: an undercarriage featuring a drive motor; a superstructure featuring multiple engine pumps provided for the superstructure functions; and a drive device in accordance with claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, preferred embodiments of the present invention are described in more detail by referring to the enclosed figures. The invention can comprise the features described here, individually and in any expedient combination. Specifically, there is shown:

(2) FIG. 1 a first linear arrangement of engine pumps;

(3) FIG. 2 a second linear arrangement of engine pumps;

(4) FIG. 3 a first embodiment of the drive device in accordance with the invention;

(5) FIG. 4 a second embodiment of the drive device in accordance with the invention.

DESCRIPTION

(6) FIG. 1 shows a first linear arrangement of multiple engine pumps 4A to 4D, 5A and 5B which are coupled, substantially coaxially, to two outputs on each of the two sides of the hydraulic motor 7, wherein the pumps 5A and 5B form an engine pump group and the pump 5B is not driven directly by the hydraulic motor 7 but rather indirectly via the pump 5A which provides an output for the pump 5B and is in turn driven directly by the hydraulic motor 7. A very similar arrangement is to be found at the other, coaxially opposite output of the hydraulic motor 7 shown on the left-hand side in FIG. 1, in which the pump 4A is directly coupled to the hydraulic motor 7, and the pumps 4B to 4D are driven via outputs of the pumps connected respectively upstream of them.

(7) A very similar arrangement to the arrangement from FIG. 1 is shown schematically in FIG. 2. A hydraulic motor 7, which is again provided centrally, drives groups of coaxially arranged pumps 4A to 4C and 5A to 5D on each of its two sides, wherein the individual pumps perform various functions for supplying power to the crane superstructure. In one specific case, the pump 4A is for example an open-circuit pump for the telescoping and derricking mechanism, the pump 4B is an open-circuit pump for the telescoping and derricking mechanism, the pump 4C is an open-circuit pump for the auxiliary engines, the pump 5A is a closed-circuit pump for the main lifting mechanism, the pump 5B is a closed-circuit pump for the auxiliary lifting mechanism, the pump 5C is a closed-circuit pump for the slewing mechanism, and the pump 5D is a toothed wheel pump for the control pressure. A device 14 for detecting the rotary speed is additionally arranged between the hydraulic motor 7 and the pump 4A.

(8) FIG. 3 shows a first embodiment of the drive device in accordance with the invention. A combustion engine 2, which is arranged in the undercarriage 1 of the crane, drives two hydraulic pumps 8 and 9 via a gearbox 16, wherein the hydraulic pumps 8 and 9 drive the hydraulic motor 7 via a closed hydraulic circuit 6 of the drive device which extends from the undercarriage 1 into the superstructure 3 via the rotary union 15. Engine pump groups 11 and 12, each comprising multiple engine pumps 4 and 5, respectively, are again arranged on each of the two sides of the hydraulic motor 7.

(9) FIG. 4 shows another embodiment of the drive device in accordance with the invention, which differs from the embodiment shown in FIG. 3 solely by a pump transfer gearbox 10 which is directly coupled to the hydraulic motor 7 (on its left-hand side in FIG. 4) and in turn comprises two outputs for two engine pump groups 11 and 13 running at different rotary speeds.