A bulldozer includes a steering clutch, a steering brake, a hydraulic pump that discharges a lubricating oil, a first lubricating oil supply path, a second lubricating oil supply path, a third lubricating oil supply path, and a flow amount switching valve disposed on the second lubricating oil supply path. The first lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering clutch The second lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering brake. The third lubricating oil supply path supplies, to the steering brake, a portion of the lubricating oil that has passed through the steering clutch. The flow amount switching valve switches an amount of the lubricating oil supplied to the steering brake.

The invention relates to a modification system for modifying the steering ratio for a vehicle having steered wheels (11), a steering wheel (10), and a steering transmission device (20) serving to transmit steering movement between the steering wheel (10) and the steered wheels (11) with a steering ratio R=Alpha/Beta, where Alpha is the turning angle of the steering wheel, and Beta is the steering angle of the wheels; said system comprising a device for determining the angular speed of the steering wheel. Said system comprises a module (102) for controlling the steering ratio R configured to calculate the steering ratio as a function of the angular speed of the steering wheel (10). The invention also relates to a wheeled vehicle fitted with such a steering ratio modification system.

A utility vehicle comprises a plurality of ground engaging members and a frame supported by the plurality of ground engaging members. The frame includes a front frame portion, a mid-frame portion, and a rear frame portion. The utility vehicle further comprises an attachment supported at the front frame portion. Additionally, the utility vehicle includes an operator area supported by the frame and including an operator seat and an adjacent passenger seat spaced apart from the operator seat. The operator seat and the passenger seat are in a side-by-side arrangement. The utility vehicle also comprises an auxiliary power assembly having an attachment shaft configured to be operably coupled to the attachment. The attachment shaft extends in a generally longitudinal direction of the utility vehicle and projects outwardly from the front frame portion.

A blade positioning system for a work machine. The system may have a blade control which has a blade position sensor, and the blade control may adjust a blade of the work machine to a fixed position relative to a wheel. The system may also have a steering control that has a wheel position sensor, and the steering control may steer the work machine. The controller may monitor the blade position sensor and the wheel position sensor to determine a present position of the blade and the wheel prior to the repositioning of the wheel, and adjust the blade position as the wheel is repositioned to maintain the fixed position of the blade relative to the wheel.

A method of controlling a transmission includes providing an input, an output, a controller, a control system, a hydrostatic unit, and a geartrain. The geartrain includes a direct drive pivot clutch and a steer drive geartrain. The method also includes receiving a pivot command by the controller from a shift selector, where the command indicates the shift selector is in a pivot position. The method further includes engaging the direct drive pivot clutch, decoupling the hydrostatic unit from a torque path defined between the input and the output, and coupling the input and the output to one another via a second torque path. The second torque path is defined through the direct drive pivot clutch and the steer drive geartrain. The transmission is controllable in a direct drive steer operation.

A new and combined grader with high efficiency and low cost is introduced.

A virtual guidance apparatus assists movement of a loader for connection of a tool carrier with an implement. A vision sensor device generates implement image data representative of an image of an implement adjacent to the tractor. Based on the implement image data relative difference data is generated representative of a relative position between an implement attachment feature that is mutually coupleable with a corresponding carrier attachment feature for coupling the tool carrier with the implement. Based on the relative difference data, alignment guidance data is generated representative of an incremental movement for moving the loader relative to the implement. A visual movement instruction is displayed based on the implement image data and the alignment guidance data superimposed on a viewable image of the implement. The visual movement instruction provides instructions to the operator for moving the loader relative to the implement for coupling the tool carrier with the implement.

In a work machine, when on a travel plane S of crawler belts, a straight line passing through a predicted travel point P1 a given distance from the crawler belts and having a maximum climbing angle is assumed to be a first line L1, and a line connecting an installation position of a distance sensor and the predicted travel point P1 is assumed to be a second line L2. The distance sensor measures a distance to a ground surface on the second straight line L2. A controller calculates a height H1 of a predicted travel region T based on a result of the distance sensor and a detection result of a turning angle sensor, and determines whether a height difference H3 between a height H1 of the predicted travel region T and a height H2 of the travel plane S is equal to or greater than a threshold.

A system may comprise a plurality of sensors configured to transmit sensor information regarding a speed of a machine, a position of an implement of the machine, a payload of the machine, a grade of a surface on which the machine is traveling. The system may further comprise an electronic control module configured to receive steering command information regarding a steering command of the machine; determine, based on the steering command information, one or more articulation parameters associated with the steering command, determine the speed, the position of the implement, the payload, and the grade based on the sensor information. The electronic control module may be configured to determine one or more articulation parameters thresholds based on the speed, the position of the implement, and the payload of the machine; and modify the steering command when the one or more articulation parameters exceeds the one or more articulation parameters thresholds.

A system and method for limiting articulation between a front frame and a rear frame of an articulated machine are disclosed. The system and method receive steering signals and determine impending contact between the front frame and the rear frame based on the received steering signals. Additionally, an amount by which to reduce torque at a hitch coupled between the front and rear frames so as to limit an articulation characteristic of the front frame relative to the rear frame to a predetermined value is determined, responsive to determination of impending contact. Prior to contact, rimpull of the articulated machine is reduced based on the determined amount of torque.