Power take-off transmission and agricultural machine

Patent metadata

Field	Value
Publication number	US-11225139-B2
Application number	US-201916416464-A
Country	US
Kind code	B2
Filing date	May 20, 2019
Priority date	Jun 5, 2018
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A power take-off transmission (1), for a motor vehicle, having a power take-off shaft (5), a transmission housing (3), at least two shiftable gears and at least one actuator for engaging the at least two gears. The at least one actuator has an actuating linkage (6) for mechanical actuation from outside the transmission housing (3). The actuating linkage (6) of the power take-off transmission (1) is coupled to an electric motor (8) located outside the transmission housing (3) and by which the at least one actuator can be actuated mechanically. The power take-off transmission can be installed on an agricultural working machine.

First claim

The invention claimed is:

1. A power take-off transmission for a motor vehicle comprising:
a power take-off shaft;
a transmission housing which houses the power-take off transmission and a drive transmission, the power take-off shaft and at least one drive output shaft extending from the transmission housing;
at least two shiftable gears, each of the at least two shiftable gears being shiftable to an engaged position and a neutral position;
at least one actuator being arranged within the transmission housing for engaging the at least two shiftable gears, the at least one actuator having an actuating linkage;
the actuating linkage extending from inside the transmission housing to an electric motor, the actuating linkage being coupled to the electric motor which is located outside the transmission housing and supported on the transmission housing, the actuating linkage being rotatably driven by rotation of the electric motor and the at least one actuator being mechanically actuatable by rotation of the actuating linkage to selectively shift the at least two shiftable gears to the engaged and the neutral positions;
an electronic control unit being integrated into a transmission control unit of the power take-off transmission;
the electric motor communicating with the electronic control unit, and the electronic control unit being configured to continuously detect rotational positions of the electric motor;
the electronic control unit being configured to determine that one of the at least two shiftable gears is shifted to the engaged position based on a detection that the electric motor is rotated to a first set position, and to determine that the one of the at least two shiftable gears is shifted to the neutral position based on a detection that the electric motor is rotated to a second set position, and the electronic control unit being configured to control shifting of the at least two shiftable gears by controlling rotation of the electric motor based on the rotational positions of the electric motor, and the electronic control unit being configured to automatedly rotate the power take-off shaft by controlling rotation of the electric motor based on a rotational position of the electric motor.

2. The power take-off transmission according to claim 1 , wherein the electric motor is a servomotor.

3. The power take-off transmission according to claim 1 , wherein the transmission control unit is configured to control the electric motor and to control the drive transmission, the transmission control unit being configured to selectively prevent shifting processes based on the engaged position and the neutral position of the at least two shiftable gears.

4. The power take-off transmission according to claim 3 , wherein the transmission control unit is configured to read the rotational positions of the electric motor and to automatedly rotate the power take-off shaft to a coupling orientation of the power take-off shaft.

5. The power take-off transmission according to claim 3 , wherein the transmission control unit is configured to selectively prevent certain shifting processes of the power take-off transmission based on the rotational position of the electric motor.

6. The power take-off transmission according to claim 1 , wherein the actuating linkage is configured to either rotationally actuate or translationally actuate the actuator.

7. The power take-off transmission according to claim 1 , wherein the power take-off transmission has four gears, two actuators, two actuating linkages and two electric motors.

8. The power take-off transmission according to claim 1 , wherein the drive transmission is arranged in the transmission housing together with the power take-off transmission, and the transmission control unit of the power take-off transmission comprises a transmission control unit of the drive transmission.

9. The power take-off transmission according to claim 1 , wherein the power take-off transmission can be used alternatively as either a power take-off and as a trunnion shaft.

10. An agricultural working machine comprising:
a power take-off transmission having a power take-off shaft;
a transmission housing which houses the power-take off transmission and a drive transmission, the power take-off shaft and at least one drive output shaft extending from the transmission housing;
at least two shiftable gears, each of the at least two shiftable gears being shiftable to an engaged position and a neutral position;
at least one actuator for shifting the at least two shiftable gears, the at least one actuator being arranged within the transmission housing;
the at least one actuator having an actuating linkage that is arranged within the transmission housing for mechanical actuation of the at least one actuator from outside the transmission housing;
the actuating linkage extending to an electric motor located outside the transmission housing, the actuating linkage being coupled to the electric motor, the electric motor being supported on the transmission housing, the actuating linkage being rotated by rotation of the electric motor, and rotation of the actuating linkage mechanically actuates the at least one actuator;
the electric motor communicating with an electronic control unit, and the electronic control unit being configured to continuously detect rotational positions of the electric motor, the electronic control unit being integrated into a transmission control unit of the power take-off transmission; and
the electronic control unit being configured to determine that one of the at least two shiftable gears is shifted to the engaged position based on a detection that the electric motor is rotated to a first set position, and to determine that the one of the at least two shiftable gears is shifted to the neutral position based on a detection that the electric motor is rotated to a second set position, and the electronic control unit being configured to control shifting of the at least two shiftable gears and to automatedly rotate the power take-off shaft by controlling rotation of the electric motor based on a detected rotational position of the electric motor.

Assignees

• Zahnradfabrik Friedrichshafen
• Zf Friedrichsafen Ag

Inventors

• Bauer Christoph

Classifications

• F16H2200/0034

  the gear ratios comprising two forward speeds · CPC title

• B60K17/28 Primary

  characterised by arrangement, location, or type of power take-off · CPC title

• B60Y2300/1888

  Control of power take off [PTO] · CPC title

• B60W30/1888

  Control of power take off [PTO] · CPC title

• B60Y2400/795

  Power take off · CPC title