Power lift for an agricultural tractor

Patent metadata

Field	Value
Publication number	US-11357154-B2
Application number	US-201916665629-A
Country	US
Kind code	B2
Filing date	Oct 28, 2019
Priority date	Oct 26, 2018
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A power lift for an agricultural tractor includes a supporting structure configured to be mounted on the agricultural tractor. A left lower link, a right lower link, and an upper link are coupled in a pivotally movable manner, wherein the left and the right lower links and the upper link include coupling elements for attachment of an agricultural attachment. The left and the right lower links are rotatably coupled to one another via a lifting shaft, the lifting shaft being aligned with a lower link pivot axis. The left and the right lower links are pivotable by an actuating element which runs between at least one of the lower links and a support point of the supporting structure jointly about the lower link pivot axis in relation to the supporting structure.

First claim

The invention claimed is:

1. A power lift for an agricultural tractor, comprising:
a supporting structure configured to be mounted on the agricultural tractor; and
a left lower link, a right lower link, and an upper link coupled in a pivotally movable manner, wherein the left and the right lower links and the upper link include coupling elements for attachment of an agricultural attachment;
wherein the left and the right lower links are rotatably coupled to one another via a lifting shaft, the lifting shaft being aligned with a lower link pivot axis;
wherein the left and the right lower links are pivotable by an actuating element which runs between at least one of the lower links and a support point of the supporting structure jointly about the lower link pivot axis in relation to the supporting structure;
wherein the supporting structure is formed by a differential housing.

2. The power lift of claim 1 , wherein each of the left and right lower links is pivotally articulated at the lifting shaft about a transverse axis defined perpendicular to the lower link pivot axis.

3. The power lift of claim 1 , wherein the actuating element comprises a hydraulic lifting cylinder which is articulated with a lower end at the lower link and with an upper end at the support point of the supporting structure; and
wherein the support point is formed as a boom-shaped retaining leg which is attached on an upper side of the differential housing and on which the actuating element is articulated with the upper end.

4. The power lift of claim 1 , further comprising an adjustment mechanism provided at one of the two lower links for height adjustment of the coupling element independently of a pivoting movement performed by the at least one actuating element.

5. The power lift of claim 4 , wherein the left or the right lower link is divided by length into a first lower link segment assigned to the supporting structure and a second lower link segment which supports the coupling element.

6. The power lift of claim 5 , wherein the second lower link segment is pivoted vertically by the adjustment mechanism with respect to the first lower link segment.

7. The power lift of claim 6 , wherein the second lower link segment is lockable at different pivoting positions.

8. The power lift of claim 7 , wherein the adjustment mechanism for pivoting and locking the two lower link segments comprises a self-locking spindle drive.

9. The power lift of claim 7 , wherein the adjustment means comprises a detachable bolt connection for locking the two lower link segments in one or more fixed pivoting positions.

10. An agricultural tractor, comprising:
a power lift comprising a supporting structure configured to be mounted on the agricultural tractor; and
a first lower link, a second lower link, and an upper link coupled in a pivotally movable manner, wherein both lower links and the upper link comprise coupling elements;
wherein the first and second lower links are rotatably coupled to one another via a lifting shaft, the lifting shaft being aligned with a lower link pivot axis;
wherein the first and second lower links are pivotable by an actuating element which extends between at least one of the lower links and a support point of the supporting structure jointly about the lower link pivot axis in relation to the supporting structure;
wherein the supporting structure is formed by a differential housing.

11. The agricultural tractor of claim 10 , wherein each of the first and second lower links is pivotally articulated at the lifting shaft about a transverse axis defined perpendicular to the lower link pivot axis.

12. The agricultural tractor of claim 10 , wherein the actuating element comprises a hydraulic lifting cylinder which is articulated with a lower end at the lower link and an upper end at the support point of the supporting structure; and
wherein the support point is formed as a boom-shaped retaining leg which is attached on an upper side of the differential housing and on which the hydraulic lifting cylinder is articulated with the upper end.

13. The agricultural tractor of claim 10 , further comprising an adjustment mechanism provided at one of the two lower links for height adjustment of the coupling element independently of a pivoting movement performed by the actuating element.

14. The agricultural tractor of claim 13 , wherein either the first or second lower link is divided by length into a first lower link segment assigned to the supporting structure and a second lower link segment which supports the coupling element, wherein the second lower link segment is pivoted vertically by the adjustment mechanism with respect to the first lower link segment.

15. The agricultural tractor of claim 14 , wherein the second lower link segment is lockable at different pivoting positions.

16. The agricultural tractor of claim 14 , wherein the adjustment mechanism for pivoting and locking the two lower link segments comprises a self-locking spindle drive.

17. The agricultural tractor of claim 14 , wherein the adjustment means comprises a detachable bolt connection for locking the two lower link segments in one or more fixed pivoting positions.

18. A power lift for an agricultural tractor, comprising:
a support structure configured to be mounted on the agricultural tractor; and
a first link, a second link, and a third link coupled in a pivotally movable manner, wherein the first, second and third links include coupling elements for attachment of an agricultural attachment;
wherein the first and the second links are rotatably coupled to one another via a lifting shaft, the lifting shaft being aligned with a lower link pivot axis;
wherein the first and the second links are pivotable by an actuating element which extends between at least one of the first and second links and a support point of the supporting structure;
wherein each of the first and second links is pivotally articulated at the lifting shaft about a transverse axis defined perpendicular to the lower link pivot axis;
wherein the actuating element comprises a hydraulic lifting cylinder which is articulated with a lower end at the first or second link and with an upper end at the support point of the support structure;
wherein the supporting structure is formed by a differential housing.

19. The power lift of claim 18 , wherein:
the first or second link is divided by length into a first lower link segment assigned to the supporting structure and a second lower link segment which supports the coupling element;
the second lower link segment is pivoted vertically by an adjustment mechanism with respect to the first lower link segment;
the second lower link segment is lockable at different pivoting positions.

20. The power lift of claim 18 , wherein the support point is formed as a boom-shaped retaining leg which is attached on an upper side of the differential housing and on which the hydraulic lifting cylinder is articulated with the upper end.

Assignees

• Deere & Co

Inventors

• Patino Mario
• Heitlinger Martin

Classifications

• A01B59/066

  of the type comprising at least two lower arms and one upper arm generally arranged in a triangle, e.g. three-point hitches · CPC title

• A01B63/118 Primary

  Mounting implements on power-lift linkages (preventing or limiting side-play of implements A01B59/041) · CPC title

• A01B59/043 Primary

  supported at three points, e.g. by quick-release couplings (A01B59/06 takes precedence) · CPC title

• A01B63/111

  regulating working depth of implements · CPC title

• A01B59/002 Primary

  Details, component parts · CPC title