Crane and work machine

Patent metadata

Field	Value
Publication number	US-11390499-B2
Application number	US-201916456316-A
Country	US
Kind code	B2
Filing date	Jun 28, 2019
Priority date	Dec 30, 2016
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A crane arrangement includes a base, a pillar boom, a lifting boom, a folding boom, a lifting cylinder, and a folding cylinder. The lifting boom includes a first pivot point for connecting the pillar boom to the lifting boom, a second pivot point for connecting the lifting cylinder to the lifting boom, and a third pivot point for connecting the folding cylinder to the lifting boom. The lifting boom further includes a hollow cast connecting piece arranged at the first end of the lifting boom, in which connecting piece at least the first pivot point and second pivot point are arranged. The invention also relates to a corresponding work machine.

First claim

The invention claimed is:

1. A crane arrangement, comprising:
a crane; and
a base for attaching the crane to a work machine;
the crane comprising:
a pillar boom attached rotatably to the base,
a lifting boom comprising a first end and a second end, a hollow cast connecting piece arranged at the first end of the lifting boom, and a welded hollow box structure connected to the hollow cast connecting piece and including the second end of the lifting boom, wherein both the hollow cast connecting piece and the welded hollow box structure include connector surfaces joining each to the other, the lifting boom being pivoted at the first end to the pillar boom;
a folding boom comprising two ends, the folding boom being pivoted at the second end of the lifting boom to suspend a tool from the crane;
a lifting cylinder comprising a third end and a fourth end, the lifting cylinder being pivoted at the third end in connection with the pillar boom and at the fourth end to the lifting boom to operate the lifting boom,
a folding cylinder comprising a fifth end and a sixth end, the folding cylinder being pivoted at the fifth end to the lifting boom and at the sixth end pivoted to the folding boom to operate the folding boom,
wherein the hollow cast connecting piece comprises a first pivot point connecting the pillar boom to the lifting boom and receiving moments acting on the lifting boom, a second pivot point connecting the lifting cylinder to the lifting boom, and a third pivot point connecting the folding cylinder to the first end of the lifting boom and wherein at least the first pivot point, the second pivot point and the third pivot point are arranged at the hollow cast connecting piece and the hollow cast connecting piece includes an opening for routing conductors through the hollow cast connecting piece into the welded hollow box structure of the lifting boom, wherein the opening in the hollow cast connecting piece is arranged in a surface of the hollow cast connecting piece between the first pivot point and the third pivot point and a plane of the surface surrounding the opening is parallel to axes of rotation of the fisrt, second and third pivot points to provide open access to the welded hollow box structure at the first end of the lifting boom; and
wherein the pillar boom comprises a fork attaching the pillar point to the first pivot point around the connecting piece.

2. The crane arrangement according to claim 1 , wherein the second pivot point and third pivot point are arranged relative to a line between the first pivot point and a pivot point of the folding boom belonging to the second end of the lifting boom in such a way that a distance between a first intersection point of the line with a line segment perpendicular to the line and running through the second pivot point and a second intersection point of the line with a line segment perpendicular to the line and running through the third pivot point is 0-20% of a length of the line between the first pivot point and the pivot point of the folding boom.

3. The crane arrangement according to claim 2 , wherein the first intersection point is between the second intersection point and the first pivot point.

4. The crane arrangement according to claim 2 , wherein the second and third pivot points are located on opposite sides of the line.

5. The crane arrangement according to claim 1 , wherein the second pivot point and third pivot point are arranged relative to a line between the first pivot point and a pivot point of the folding boom belonging to the second end of the lifting boom in such a way a distance between a first intersection point of the line with a line segment running through the second pivot point and perpendicular to the line and a second intersection point of the line with a line segment running through the third pivot point and perpendicular to the line is 8-15% of a length of the line between the first pivot point and the pivot point of the folding boom.

6. The crane arrangement according to claim 5 , wherein a distance between the first and second intersection points is 5-15% of the length of the line.

7. The crane arrangement according to claim 1 wherein the hollow cast connecting piece comprises side walls, each of which have at least two support structures between the first pivot point, the second pivot point and the third pivot point, each of which support structures connects the first pivot point, the second pivot point and the third pivot point to each other on same side wall.

8. The crane arrangement according to claim 1 wherein the hollow cast connecting piece is a unified cast piece.

9. The crane arrangement according to claim 1 wherein the hollow cast connecting piece is formed by combining at least two cast pieces.

10. The crane arrangement according to claim 1 wherein the hollow cast connecting piece includes opposing side walls, each side wall having an opening to provide access for handling and connecting connectors of the conductors to lines contained in the lifting boom.

11. The crane arrangement according to claim 1 , wherein the hollow cast connecting piece is made of steel by casting, which steel has a yield strength of 1650-2000 N/mm 2 .

12. The crane arrangement according to claim 1 wherein the lifting cylinder includes a jacket and a piston rod and the third end of the lifting cylinder is formed in the piston rod and the fourth end in the jacket and the folding cylinder includes a second jacket and a second piston rod and the fifth end of the folding cylinder is formed in the second jacket and the sixth end in the second piston rod.

13. The crane arrangement according to claim 1 , wherein the first pivot point is farther from the second end of the lifting boom than the second pivot point and third pivot point.

14. The crane arrangement according to claim 1 , wherein the folding cylinder includes an extension for connecting the folding cylinder to the third pivot point of the hollow cast connecting piece.

15. The crane according to claim 1 , comprising a third opening arranged in a surface of the hollow cast connecting piece between the first pivot point and the second pivot point, a plane of the surface surrounding the third opening being parallel to axes of rotation of the first pivot point, the second pivot point and the third pivot point, wherein the fourth end of the lifting cylinder is attach through the third opening to the second pivot point of the hollow cast connecting piece of the lifting boom.

16. The crane according to claim 1 , wherein the opening is round and has rounded edges.

17. A work machine, comprising:
the crane arrangement according to claim 1 ;
a tool attached to the crane; and
conductors routed through the opening of the hollow cast connecting piece and into the lifting boom.

18. The work machine according to claim 17 , wherein the conductors are hydraulic conductors.

Assignees

• Ponsse Oyj

Inventors

• Auvinen Toni
• Halonen Marko

Classifications

• B66C23/42 Primary

  with jibs of adjustable configuration, e.g. foldable · CPC title

• A01G23/00

  Forestry · CPC title

• B60P1/5433

  and having the first pivot on a vertical axis · CPC title

• A01D75/002

  Carriers for the transport of harvesters or mowers · CPC title

• B66C23/44

  Jib-cranes adapted for attachment to standard vehicles, e.g. agricultural tractors · CPC title