Komatsu Corporation

Toshihiro Yone

Kota Yamaguchi

Yuji Asai

Naoto Ikeda

Hirohito Hagiwara

A work vehicle includes an operation apparatus, a transmission having a plurality of gear positions, and a controller configured to control shift of a gear position of the transmission to a gear position equal to or lower than a shift upper limit position based on a vehicle speed of the work vehicle. The controller makes setting to raise the shift upper limit position by one position based on a first operation having been performed onto the operation apparatus. The controller changes the shift upper limit position from a first shift upper limit position immediately before a second operation different from the first operation to a second shift upper limit position based on the second operation having been performed onto the operation apparatus. The second shift upper limit position is higher than the first shift upper limit position by at least two positions.

Work vehicle and control method

The work equipment for the motor grader includes: a drawbar having a drawbar plate; a bearing having an outer ring and inner ring, the outer ring being fixed to a lower surface of the drawbar plate and the inner ring, disposed inside the outer ring ring; a circle having a circle plate that is fixed to a lower end of the inner ring over the peripheral direction; a blade supported by the circle; a peripheral-direction pipe extending in the peripheral direction of the outer ring along a peripheral surface of the outer ring and connected to an end portion of an outer peripheral side of the plurality of lubricant supply holes; and the lubricant inlet port connected to the peripheral-direction pipe and capable of introducing a lubricant oil from an outside.

Work equipment for motor grader

A work equipment includes: a drawbar having a drawbar plate; a bearing having an outer ring which is fixed to a lower surface of the drawbar plate, and an inner ring which is disposed inside the outer ring and is connected to the outer ring so as to be rotatable in a peripheral direction with respect to the outer ring; and a circle having a circle plate that is fixed to a lower end of the inner ring over the peripheral direction, an outer peripheral-side wall portion that is connected to an outer peripheral side of the circle plate and has a cylindrical shape surrounding the bearing from an outer peripheral side, and an inner circumferential-side wall portion protruding from the upper surface of the circle plate between the bearing and the outer peripheral-side wall portion, extends in the peripheral direction, and faces the outer ring in the radial direction.

The work equipment for a motor grader includes: a rotary machine main body for rotating an outer gear engaging with an inner gear provided on an inner peripheral surface of an inner ring of a bearing; and a rotary machine lubrication unit provided on a gear cover in a circle rotary machine and for supplying a lubricant to a space, wherein the gear cover is provided in the rotary machine main body, covers the outer gear from the outer peripheral side thereof, forms the space between the outer gear and the gear cover, and is fixed to a drawbar plate.

A work equipment for a motor grader comprising: a drawbar including: a drawbar plate and an outer peripheral-side rib that is integrally fixed to the drawbar plate so as to protrude from a lower surface of the drawbar plate; and a circle including a circle plate that protrudes outside of the outer peripheral-side rib in the radial direction and forms a lower-side gap between a lower end of the outer peripheral-side rib and the circle plate; and an outer peripheral-side wall portion that is connected to the outer peripheral side of the circle plate, has a cylindrical shape surrounding the outer peripheral-side rib from an outer peripheral side of the outer peripheral-side rib, and forms a clearance between the lower surface of the drawbar plate and the outer peripheral-side wall portion.

Growing community of inventors

Tokyo, Japan

Toshihiro Yone