Front loader and work car
A front loader is attached to a car body and includes: a boom; a mainframe fixed to the car body; and a subframe that is detachably attached to the mainframe and supports the boom. The subframe includes: a first engaging portion that engages with the mainframe, and a second engaging portion that engages with the mainframe at a different position from the first engaging portion. Both the first engaging portion and the second engaging portion are formed in an attachment member that is integrally formed and that constitutes at least a portion of the subframe.
1. A front loader attached to a car body, comprising:
a boom;
a mainframe that is fixed to the car body and comprises a hook and a mainframe insertion hole; and
a subframe that is detachably attached to the mainframe and supports the boom, wherein
the subframe comprises:
a pair of supporting plates that supports the boom; and
an attaching part that is integrally formed with the subframe, is disposed between the supporting plates, and attaches the subframe to the mainframe,
the attaching part includes:
a first subframe insertion hole that engages with the hook of the mainframe, and
a second subframe insertion hole that engages with the mainframe insertion hole of the mainframe at a different position from the first subframe insertion hole,
each of the supporting plates has a through hole or a cutout portion that fits the attaching part, and
the first subframe insertion hole and the second subframe insertion hole are exposed from the through hole or the cutout portion in a state where the attaching part is fitted to the through hole or the cutout portion.
2. The front loader according to claim 1 , wherein
a fixing pin fixing the mainframe and the subframe is inserted into the second subframe insertion hole.
3. The front loader according to claim 1 , further comprising:
a guide that:
comprises a convex portion and a concave portion, and
guides, when the subframe is attached to the mainframe, the subframe to a predetermined position at which the second subframe insertion hole engages with the mainframe insertion hole of the mainframe while the first subframe insertion hole engages with the hook of the mainframe.
4. The front loader according to claim 3 , wherein
the convex portion is disposed in the subframe and protrudes in a first direction, and
the concave portion is disposed in the mainframe, is recessed in the same direction as the first direction, and contacts the convex portion.
5. The front loader according to claim 4 , wherein
the attaching part has a pair of lateral-face portions disposed at an interval from each other,
at least a portion of the mainframe is housed between the lateral-face portions, and
the convex portion protrudes in the one direction from each of the lateral-face portions.
6. The front loader according to claim 3 , wherein
the guide comprises:
a subframe-side flat portion that is disposed in the subframe, and
a mainframe-side flat portion that is disposed in the mainframe and contacts the subframe-side flat portion.
7. The front loader according to claim 1 , wherein
the attaching part is fixed to the supporting plates while being fitted to the through hole or the output portion.
8. The front loader according to claim 1 , wherein
the attaching part is molded by casting or forging.
9. A work car comprising:
a car body; and
a front loader attached to the car body, wherein
the front loader comprises:
a boom;
a mainframe that is fixed to the car body and comprises a hook and a mainframe insertion hole; and
a subframe that is detachably attached to the mainframe and supports the boom,
the subframe comprises:
a pair of supporting plates that supports the boom; and
an attaching part that is integrally formed with the subframe, is disposed between the supporting plates, and attaches the subframe to the mainframe,
the attaching part includes:
a first subframe insertion hole that engages with the hook of the mainframe, and
a second subframe insertion hole that engages with the mainframe insertion hole of the mainframe at a different position from the first subframe insertion hole,
each of the supporting plates has a through hole or a cutout portion that fits the attaching part, and
the first subframe insertion hole and the second subframe insertion hole are exposed from the through hole or the cutout portion in a state where the attaching part is fitted to the through hole or the cutout portion.