Transmission arrangement for a travel drive, travel drive with the transmission arrangement and method for controlling the transmission arrangement

Patent metadata

Field	Value
Publication number	US-10634229-B2
Application number	US-201715588633-A
Country	US
Kind code	B2
Filing date	May 6, 2017
Priority date	May 13, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A transmission arrangement for a travel drive includes a transmission input that is configured to be coupled to a working machine and a transmission output that is configured to be coupled to an output drive. The transmission arrangement further includes a hydrostatic transmission and a manual transmission coupled in series for the transmission of power between the transmission input and the transmission output. The manual transmission has changeable transmission stages at least when the transmission output is at a standstill. A control device is configured to change the transmission stages.

First claim

What is claimed is:

1. A transmission arrangement for a travel drive, comprising:
a transmission input configured to be coupled to a drive machine;
a transmission output configured to be coupled to an output drive;
a hydrostatic transmission and a manual transmission coupled in series for the transmission of power between the transmission input and the transmission output, the manual transmission having changeable transmission stages at least when the transmission output is at a standstill; and
a control device configured to control a change in the transmission stages,
wherein the transmission arrangement is configured such that the transmission stages can only be changed in the event of standstill via the control device when the transmission output is directly or indirectly fixed.

2. The transmission arrangement according to claim 1 , wherein a fixing of the transmission output is configured to be one or more of controlled and identified via the control device.

3. The transmission arrangement according to claim 2 , further comprising a brake configured to fix the transmission output.

4. The transmission arrangement according to claim 2 , wherein the fixing is configured to be identified via the control device as a function of a brake signal.

5. The transmission arrangement according claim 1 , further comprising a rotational speed detection unit via which a rotational speed of the transmission output or a rotational speed of a component connected rotationally conjointly thereto is configured to be detected,
wherein the transmission arrangement is configured such that the transmission stages can only be changed in the event of standstill via the control device when the rotational speed is detected to be equal to zero.

6. The transmission arrangement according to claim 1 , wherein the manual transmission has an input shaft and an output shaft that are configured to be brought into rotational connection, in each case with a different transmission ratio, with one another via the changeable transmission stages, and wherein the transmission output of the transmission arrangement is formed by the output shaft of the manual transmission.

7. The transmission arrangement according to claim 6 , wherein the hydrostatic transmission has a first hydraulic machine with adjustable first displacement volume and a second hydraulic machine, arranged with the latter in a hydraulic circuit, with adjustable second displacement volume, and wherein the transmission input of the transmission arrangement is formed by a first driveshaft of the first hydraulic machine.

8. The transmission arrangement according to claim 7 , wherein a second driveshaft of the second hydraulic machine is configured to be connected in a rotationally conjoint manner to the input shaft of the manual transmission.

9. The transmission arrangement according to claim 6 , wherein the transmission arrangement is configured such that the transmission stages can only be changed in the event of standstill via the control device when a torque of the input shaft of the manual transmission is equal to zero.

10. The transmission arrangement according to claim 8 , wherein the transmission arrangement is configured such that the second displacement volume is controlled to zero via the control device so that the torque of the input shaft of the manual transmission is equal to zero.

11. A travel drive, comprising:
a transmission arrangement, including:
a transmission input,
a transmission output,
a hydrostatic transmission and a manual transmission coupled in series for the transmission of power between the transmission input and the transmission output, the manual transmission having changeable transmission stages at least when the transmission output is at a standstill, and
a control device configured to control a change in the transmission stages,
wherein the transmission arrangement is configured such that the transmission stages can only be changed in the event of standstill via the control device when the transmission output is directly or indirectly fixed;

a drive machine coupled to the transmission input of the transmission arrangement; and
an output drive coupled to the transmission output of the transmission arrangement.

12. A method for controlling a transmission arrangement, the transmission arrangement including a transmission input configured to be coupled to a drive machine, a transmission output configured to be coupled to an output drive, a hydrostatic transmission and a manual transmission coupled in series for the transmission of power between the transmission input and the transmission output, the manual transmission having changeable transmission stages at least when the transmission output is at a standstill, and a control device configured to control a change in the transmission stages, the method comprising:
fixing the transmission output; and
changing the transmission stage of the manual transmission in the event of standstill of the transmission output.

13. The method according to claim 12 , wherein fixing the transmission output includes activating a brake of the transmission arrangement.

14. The method according to claim 12 , further comprising one or more of:
controlling the fixing via the control device, and
identifying the fixing via the control device.

15. The method according to claim 14 , wherein identifying the fixing includes identifying a rotational speed of the transmission output.

16. The transmission arrangement according to claim 1 , wherein the transmission arrangement is configured for a mobile working machine, and wherein the output drive is a wheel or a differential.

17. The travel drive according to claim 11 , wherein the travel drive is configured for a mobile working machine, and wherein the output drive is configured as a wheel or a differential.

Assignees

• Bosch Gmbh Robert

Inventors

• Ilk Erich
• Brix Norman

Classifications

• F16H2061/161

  by checking feasibility of shifts, i.e. determine if requested shift can be successfully completed and post shift values are in an acceptable range · CPC title

• F16H59/40

  Output shaft speed · CPC title

• F16H2061/166

  Preventing or initiating shifts for preventing stall or overspeed of engine · CPC title

• F16H47/02 Primary

  the fluid gearing being of the volumetric type · CPC title

• F16H61/16 Primary

  Inhibiting  {or initiating}  shift during unfavourable conditions  {, e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed}   (F16H61/18 takes precedence) · CPC title