Abstract: A suspension arm A-shaped in a plan view includes legs receiving therebetween front and rear surfaces of a vertical member arranged in a travel direction of a working vehicle. The legs of the suspension arm and the surfaces of the vertical member each have a hole. An attaching structure includes: a cantilevered pin inserted into the hole of each of the legs and the corresponding hole of the vertical member to hold the leg of the suspension arm such that the suspension arm is pivotable; and a retaining mechanism provided to a frame to prevent the pin from coming off the vertical member. The pin includes a projection extending radially outward at a base end in an insertion direction. The retaining mechanism includes: a holding portion holding the projection in a rotation direction of the pin; and a cover portion covering the projection in the insertion direction of the pin.

Abstract: A suspension arm A-shaped in a plan view includes legs receiving therebetween front and rear surfaces of a vertical member arranged in a travel direction of a working vehicle. The legs of the suspension arm and the surfaces of the vertical member each have a hole. An attaching structure includes: a cantilevered pin inserted into the hole of each of the legs and the corresponding hole of the vertical member to hold the leg of the suspension arm such that the suspension arm is pivotable; and a retaining mechanism provided to a frame to prevent the pin from coming off the vertical member. The pin includes a projection extending radially outward at a base end in an insertion direction. The retaining mechanism includes: a holding portion holding the projection in a rotation direction of the pin; and a cover portion covering the projection in the insertion direction of the pin.

Abstract: A dump truck includes a suspension and a steering mechanism. The suspension includes: a suspension arm in a form of an upper arm having an up-and-down movable proximal end supported on a vehicle body frame; and a tire support in a form of a casing rotatably attached to a distal end of the upper arm. The steering mechanism includes a steering cylinder having a proximal end attached to the upper arm and a distal end attached to a knuckle arm provided to the tire support.

Abstract: A dump truck includes: a vehicle body frame; a body supported by the vehicle body frame and configured to be raised or lowered; a plurality of tires provided to the vehicle body frame via a suspension; and a driving unit in a form of an electric motor configured to drive the tires, in which the vehicle body frame includes: supports respectively supporting an upper arm and a lower arm of a suspension arm of the suspension; and a hollow part at least partially in the vicinity of the supports, and the electric motor is fixed to the vehicle body frame while being housed in the hollow part of the vehicle body frame and supported by an inner surface of the hollow part.

Abstract: A suspension of a dump truck includes: an upper arm and a lower arm each having a proximal end supported on a vehicle body frame and configured to be up-and-down pivotally movable; a tire support in a form of a casing having an upper portion rotatably connected to a distal end of the upper arm and a lower portion rotatably connected to a distal end of the lower arm; and a suspension cylinder having an upper end rotatably connected to the vehicle body frame and a lower end rotatably connected to the upper arm, in which a king pin shaft connecting a rotation center of the upper arm and the casing with a rotation center of the lower arm and the casing intersects with an axial line of the suspension cylinder in the vicinity of a connecting portion of the upper arm and the casing.

Abstract: A suspension of a dump truck includes: an upper arm and a lower arm each having a proximal end supported on a vehicle body frame and configured to be up-and-down pivotally movable; a tire support in a form of a casing having an upper portion rotatably connected to a distal end of the upper arm and a lower portion rotatably connected to a distal end of the lower arm; and a suspension cylinder having an upper end rotatably connected to the vehicle body frame and a lower end rotatably connected to the upper arm, in which a king pin shaft connecting a rotation center of the upper arm and the casing with a rotation center of the lower arm and the casing intersects with an axial line of the suspension cylinder in the vicinity of a connecting portion of the upper arm and the casing.

Abstract: A dump truck includes: a vehicle body frame; a body supported by the vehicle body frame and configured to be raised or lowered; a plurality of tires provided to the vehicle body frame via a suspension; and a driving unit in a form of an electric motor configured to drive the tires, in which the vehicle body frame includes: supports respectively supporting an upper arm and a lower arm of a suspension arm of the suspension; and a hollow part at least partially in the vicinity of the supports, and the electric motor is fixed to the vehicle body frame while being housed in the hollow part of the vehicle body frame and supported by an inner surface of the hollow part.

Abstract: A dump truck includes a suspension and a steering mechanism. The suspension includes: a suspension arm in a form of an upper arm having an up-and-down movable proximal end supported on a vehicle body frame; and a tire support in a form of a casing rotatably attached to a distal end of the upper arm. The steering mechanism includes a steering cylinder having a proximal end attached to the upper arm and a distal end attached to a knuckle arm provided to the tire support.