Front loader with swing link member

摘要

A front loader includes a mechanical posture maintaining mechanism for maintaining the posture of an implement, regardless of swing displacement of a boom. The boom is formed in a curved shape in which a longitudinal central side thereof is located above. The posture maintaining mechanism includes a swing link member having an inner free-end part and an outer free-end part and disposed at a longitudinal center location of the boom so as to be swingable about a third horizontal pivot as a fulcrum. A base-end link member extends between a fixed bracket and the inner free-end part and a free-end link member links the outer free-end part to the implement.

主权项

1. A front loader, comprising:
a fixed bracket mountable to a vehicle body; a boom mounted to the fixed bracket so as to be vertically swingable about a first horizontal pivot; an implement mounted to a free-end part of the boom so as to be swingable about a second horizontal pivot; and a mechanical posture maintaining mechanism for substantially maintaining a posture of the implement one of:
regardless of swing displacement of the boom; and/orbetween different swing displacement positions of the boom, wherein: the boom has a curved shape in which a longitudinal central side of the boom is located above a center-to-center straight line extending between a center of the first pivot and a center of the second pivot; the posture maintaining mechanism includes:
a swing link member having two free-end parts and disposed in an area of a longitudinal center location of the boom so as to be swingable about a third horizontal pivot;a base-end link member extending between the fixed bracket and one of the free-end parts of the swing link member; anda free-end link member that links the other free-end part of the swing link member to the implement, the swing link member is configured so that one of the free-end parts serves as an inner free-end part located inward in a boom bending direction from an upper surface of the boom, and the other free-end part serves as an outer free-end part located outward in the boom bending direction from the upper surface of the boom, and the boom includes:
a base-end boom part located on the first pivot side from a peak that is furthest from the center-to-center straight line; anda free-end boom part located on the second pivot side from the peak, and the free-end boom part being provided with the third pivot;a boom cylinder connected to the fixed bracket and to a point located behind the swing link member; andthe swing link member is configured so that a triangular shape area is formed by:
the third horizontal pivot;a first coupling shaft coupling the free-end part to the base-end link member; anda second coupling shaft coupling the other free-end part to the free-end link member.