Work vehicle

Patent metadata

Field	Value
Publication number	US-12010936-B2
Application number	US-202217825072-A
Country	US
Kind code	B2
Filing date	May 26, 2022
Priority date	Jun 1, 2021
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

A tractor includes a link mechanism and a power extractor. The link mechanism includes a top link, a right lower link, and a left lower link. A work apparatus is connectable to the link mechanism to move the work apparatus upward and downward. The power extractor is connectable to a power input of the work apparatus to take power from a power source and supply the power to the work apparatus. The power extractor is located at a position lower than a lowest position of the right lower link and a lowest position of the left lower link.

First claim

What is claimed is:

1. A tractor connectable to and disconnectable from a work apparatus, the tractor comprising:
a link mechanism including a top link, a right lower link, and a left lower link, the link mechanism being connectable to and disconnectable from the work apparatus and being configured to move the work apparatus upward and downward when the work apparatus is connected thereto; and
a power extractor that includes a power extraction shaft to engage with and disengage from a power input of the work apparatus to take power from a power source and supply the power to the work apparatus when the power extraction shaft and the power input are engaged with each other; wherein
the power extractor is located at a position lower than a lowest position of the right lower link and a lowest position of the left lower link.

2. The tractor according to claim 1 , wherein the power extractor is located at a rear side of a rear end of the right lower link located at its lowest position and a rear end of the left lower link located at its lowest position.

3. The tractor according to claim 1 , further comprising a frame body connected to the top link, the left lower link, and the right lower link; wherein
the frame body is connectable to the work apparatus; and
the power extractor is supported and surrounded by the frame body.

4. The tractor according to claim 3 , further comprising:
a transmission apparatus to change a speed of the power from the power source, the transmission apparatus including a work power output shaft located at a position higher than the lowest position of the right lower link and the lowest position of the left lower link to output the power at the changed speed; and
a power transfer apparatus connecting the work power output shaft and the power extractor to each other such that the power is transferable between the work power output shaft and the power extractor; wherein
the frame body surrounds the power transfer apparatus.

5. A tractor comprising:
a link mechanism including a top link, a right lower link, and a left lower link, the link mechanism being connectable to a work apparatus to move the work apparatus upward and downward;
a power extractor that is connectable to a power input of the work apparatus to take power from a power source and supply the power to the work apparatus;
a frame body connected to the top link, the left lower link, and the right lower link;
a transmission apparatus to change a speed of the power from the power source, the transmission apparatus including a work power output shaft located at a position higher than a lowest position of the right lower link and a lowest position of the left lower link to output the power at the changed speed; and
a power transfer apparatus connecting the work power output shaft and the power extractor to each other such that the power is transferable between the work power output shaft and the power extractor; wherein
the power extractor is located at a position lower than the lowest position of the right lower link and the lowest position of the left lower link;
the frame body is connectable to the work apparatus;
the power extractor is supported and surrounded by the frame body;
the frame body surrounds the power transfer apparatus; and
the power transfer apparatus is an attachable and detachable power transfer apparatus.

6. A tractor comprising:
a link mechanism including a top link, a right lower link, and a left lower link, the link mechanism being connectable to a work apparatus to move the work apparatus upward and downward;
a power extractor that is connectable to a power input of the work apparatus to take power from a power source and supply the power to the work apparatus; and
a frame body connected to the top link, the left lower link, and the right lower link; wherein
the power extractor is located at a position lower than a lowest position of the right lower link and a lowest position of the left lower link;
the frame body is connectable to the work apparatus;
the power extractor is supported and surrounded by the frame body;
the frame body is connectable to the work apparatus based on an upward movement of the link mechanism and is disconnectable from the work apparatus based on a downward movement of the link mechanism; and
the power extractor is supported by the frame body such that the power extractor is swingable about an axis extending in a left-right direction of the tractor.

7. The tractor according to claim 6 , further comprising:
a sprocket located at the power extractor to input the power into the power extractor; and
a power transfer apparatus to transfer the power to the power extractor; wherein
the power transfer apparatus includes a chain wound around the sprocket.

8. A tractor comprising:
a link mechanism including a top link, a right lower link, and a left lower link, the link mechanism being connectable to a work apparatus to move the work apparatus upward and downward;
a power extractor that is connectable to a power input of the work apparatus to take power from a power source and supply the power to the work apparatus; and
a frame body connected to the top link, the left lower link, and the right lower link; wherein
the power extractor is located at a position lower than a lowest position of the right lower link and a lowest position of the left lower link;
the frame body is connectable to the work apparatus;
the power extractor is supported and surrounded by the frame body; and
the frame body is attachable to and detachable from the link mechanism.

9. A tractor comprising:
a link mechanism including a top link, a right lower link, and a left lower link, the link mechanism being connectable to a work apparatus to move the work apparatus upward and downward; and
a power extractor that is connectable to a power input of the work apparatus to take power from a power source and supply the power to the work apparatus; wherein
a transmission apparatus to change a speed of the power from the power source, the transmission apparatus including a work power output shaft located at a position higher than a lowest position of the right lower link and a lowest position of the left lower link to output the power at the changed speed; and
a power transfer apparatus connecting the work power output shaft and the power extractor to each other such that the power is transferable between the work power output shaft and the power extractor; wherein
the power extractor is located at a position lower than the lowest position of the right lower link and the lowest position of the left lower link;
the power transfer apparatus includes:
a lateral shaft connected to the work power output shaft and extending through a position higher than the position of the power extractor to a rear end portion of the right lower link and a rear end portion of the left lower link; and
a vertical connector connecting a rear end portion of the lateral shaft and the power extractor to each other to transfer the power along a vertical direction of the tractor.

10. The tractor according to claim 9 , wherein the power transfer apparatus is an attachable and detachable power transfer apparatus.

11. The tractor according to claim 9 , wherein
the vertical connector includes:
an input to which the lateral shaft is connected; and
a vertical transfer connector to extend in an up-down direction of the tractor when the link mechanism is located at a lowest position so as to connect the input and the power extractor to each other; and

the input of the vertical connector overlaps with the power extractor in a front-rear direction of the tractor.

12. The t

Assignees

• Kubota Kk

Inventors

• Kobayashi Kumiko
• Ushiro Kenzo
• Yamanaka Sadao

Classifications

• B62D49/06

  adapted for multi-purpose use · CPC title

• B60K25/06

  from the transmission power take-off · CPC title

• A01B59/067

  the lower arms being lifted or lowered by power actuator means internally incorporated in the tractor · CPC title

• A01B71/00 Primary

  Construction or arrangement of setting or adjusting mechanisms, of implement or tool drive or of power take-off; Means for protecting parts against dust, or the like; Adapting machine elements to or for agricultural purposes · CPC title

• A01B71/06 Primary

  Special adaptations of coupling means between power take-off and transmission shaft to the implement or machine · CPC title