Patent ID: 11970834
Assignee: KOMATSU LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A work machine, comprising:
a vehicle main body;
a boom that has a base end portion supported by the vehicle main body and that extends from the vehicle main body;
a first actuator that connects the boom and the vehicle main body and is configured to rotate the boom with respect to the vehicle main body about a first central axis intersecting with an extending direction of the boom; and
a first electric motor that is connected to the first actuator to operate the first actuator,
wherein the boom comprises:
a pair of boom lateral plates that is disposed to face each other in a direction of the first central axis; and
a boom bottom plate that connects the boom lateral plates to each other,
wherein the first electric motor is disposed in a boom internal space surrounded by the pair of boom lateral plates and the boom bottom plate,
wherein the first electric motor is disposed between the boom bottom plate and the first actuator,
wherein a tip end portion of the boom is provided with a tip end convex portion that protrudes from the boom bottom plate and connects the pair of boom lateral plates,
wherein the base end portion of the boom is provided with a base end convex portion that protrudes from the boom bottom plate and connects the pair of boom lateral plates,
wherein the boom internal space is formed between the tip end convex portion and the base end convex portion,
wherein the tip end convex portion is provided with a first inclination surface and a first upper surface, the first inclination surface being inclined toward a tip end portion of the boom lateral plate while separating away from the boom bottom plate, the first upper surface having a flat shape, being bent or curved from the first inclination surface, and continuously directed to the tip end portion of the boom lateral plate,
wherein the first upper surface of the tip end convex portion is disposed closer to the boom bottom plate than an upper edge portion of the boom lateral plate,
wherein the base end convex portion is provided with a second inclination surface and a second upper surface, the second inclination surface being inclined toward a base end portion of the boom lateral plate while separating away from the boom bottom plate, the second upper surface having a flat shape, being bent or curved from the second inclination surface, and continuously directed to the base end portion of the boom lateral plate, and
wherein the second upper surface of the base end convex portion is disposed closer to the boom bottom plate than an upper edge portion of the boom lateral plate.