Abstract: A function for authenticating an operator to control whether to permit them to operate a vehicle (20) can be added to the vehicle by simple modification. An operation permission control device (22) is installed on the vehicle (20). The operation permission control device (22) incorporates a relay inserted in the middle of a start signal line (47) connecting a key switch (46) and vehicle start circuit (48) (starter relay of an engine-powered vehicle or main controller of a battery-powered vehicle) and can open and close the start signal line (47). The operation permission control device (22) reads data of a authentication card (34) carried by the operator, collates the read data with preprogrammed data in a removable set memory a (32). If the data match, the device connects the start signal line (47) to enable start of the vehicle.

Abstract: A wheel loader includes a rear frame having left and right plate-shaped main beams. A reinforcing bracket is provided at an upper position substantially in a middle of a front-and-rear direction of the rear frame, and the reinforcing bracket bridges between the main beams. A substantially middle position of the rear frame exhibits a closed-section structure that includes the reinforcing bracket. The closed-section structure at the main beams specifically includes an axle support, a reinforcing plate, a reinforcing rib and the reinforcing bracket in the order from a lower side to an upper side.

Abstract: A cooling structure for a working vehicle in which a shroud is attached to a radiator provided to a vehicle body, and an air-cooling fan is made face to an airflow opening of the shroud, wherein the shroud comprises a shroud body attached to the radiator, and an opening member having the airflow opening, and further comprises securing means capable of fixing the opening member to the shroud body, and of freely adjusting a fixing position of the opening member with respect to the shroud body, and a relative position between the air-cooling fan and the airflow opening of the shroud is made freely adjustable. With the configuration above, the sufficient amount of heat radiated by the radiator can be obtained without causing the disadvantages such as increased noise.

Abstract: In a working vehicle having a tilt floor, a torsion bar has one end mounted on the tilt floor and the other end thereof mounted on a base frame, and is disposed on the tilt floor which is tilted up and down relative to the base frame. In a maximally opened position where the tilt floor is tilted up and a closed position where the tilt floor is tilted down, a position of a barycenter (G) of the tilt floor on which the driving room (C) is disposed is opposite from each other relative to a turning center of the tilt floor across the top dead center.

Abstract: A wheel loader includes a bucket boom including a pair of left and right side members; a front frame to which the base ends of the pair of side members are coupled; and a boom cylinder of which a base end is coupled to the front frame and a distal end is coupled to the side members. A base-end interval between the pair of side members is smaller than a distal-end interval between the side members. A face section that inclines towards a middle as extending in an upwards direction is provided on the left and right extremities of the front frame. A mounting boss to which the base end of the boom cylinder is attached is provided on a lower side of the face section while a mounting boss to which the base ends of the side members are attached is provided on an upper side of the face section.

Abstract: The present invention provides a center frame designed so that a center member, legs, and a lower plate can be formed by bending metal sheets, and to provide a manufacturing method for the center frame. A pair of front legs 13 and a pair of rear legs 14 are formed by bending metal sheets so as to have substantially reverse U-shaped cross-sections. The center member 10 is formed by bending a metal sheet so as to have a substantially square U-shaped cross-section. The front legs 13, the rear legs 14, the center member 10, a center front plate 22, and a center rear plate 23 are placed on and securely weld to the lower plate 18, which has an approximate X shape, in a plan view, and an isosceles trapezoidal shape in a lateral cross-section. This eliminates the need for expensive molds and makes it possible to easily manufacture the center frame from the center member, legs, and lower plate formed by bending metal sheets.

Abstract: A fluid tank includes a tank main body that contains a fluid and a bubble removing device that is provided inside the main body and removes bubbles in the fluid. The main body includes a partition and a delivery port through which the fluid is fed to outside. The bubble removing device has an outflow port through which the fluid from which the bubbles have been removed flows to the inside of the main body and a bubble exhaust port through which the bubbles which have been removed are discharged to the inside of the main body. The delivery port is provided adjacent to the outflow port relative to the partition. The partition partitions the inside of the main body into a side in which the outflow port and the delivery port are provided and a side of the bubble exhaust port.

Abstract: The invention is aimed at providing a battery forklift drive unit which makes a large space unnecessary for disposing brakes in the vicinities of drive units, thereby to achieve making the vicinities of drive units compact in a battery forklift. To this end, a second gear disposed in a drive case of the drive unit is formed inside with a space in which a wet type brake section is disposed and the wet type brake section comprises an inner disk whose entire inner periphery is attached to the second gear, an outer disk which lies opposite to the inner disk and whose entire outer periphery is attached to a side of the drive case, and a pressure plate for pressing together the inner and outer disks lying opposite to each other.

Abstract: A first engaging hole and a second engaging hole are formed in a fan-shaped standing portion which is fixed to a vehicle body frame and concentrically constructed with respect to a tilt direction of a the driver's cabin with a hinge shaft as a center of tilting. The first and second engaging holes respectively correspond to a tilt down position and a tilt up position of the driver's cabin. The standing portion is inserted into an actuating member fixed to a driver's cabin frame, and a locking pin urged by a spring is slidably disposed to the actuating member. Since the locking pin slides on a surface of the standing portion, the locking pin can be automatically engaged with the first or second engaging hole.

Abstract: An object of the present invention is to provide a construction machine which precipitates the removal of earth that is churned up onto a vehicle body from the vehicle body, which reduces transfer loads on a blade bracket, which improves the attachability of the blade bracket, and which achieves standardization of the blade bracket. The construction machine according to the present invention is constituted such that a frame of a crawler belt-type traveling body comprises a center frame, a pair of truck frames disposed on the outside of two side portions of the center frame, a connecting member which connects the center frame to the truck frames, and a blade bracket which is joined to the center frame and the connecting member.

Abstract: A line 93 is provided with a line 71 communicating the line 93 and a hydraulic oil tank 51. The line 71 is provided with a throttle 72 to construct a throttle-provided line 7. When air is trapped between the hydraulic oil tank 51 and the hydraulic pump 52, the hydraulic pump 52 is driven to discharge the air from the throttle-provided line 7 to the hydraulic oil tank 51, thereby removing the air in the hydraulic circuit 5. When the air is removed, resistance caused by the throttle 72 is increased, which makes hydraulic oil flow from a pilot pump 522 to a PPC valve. Since the throttle-provided line 7 realizes air removal with a simple structure, a hydraulic cylinder 44 can be supplied with the air-removed hydraulic oil from an initial stage, thereby enhancing responsiveness of the hydraulic cylinder 44.

Abstract: A first engaging hole and a second engaging hole are formed in a fan-shaped standing portion which is fixed to a vehicle body frame and concentrically constructed with respect to a tilt direction of a the driver's cabin with a hinge shaft as a center of tilting. The first and second engaging holes respectively correspond to a tilt down position and a tilt up position of the driver's cabin. The standing portion is inserted into an actuating member fixed to a driver's cabin frame, and a locking pin urged by a spring is slidably disposed to the actuating member. Since the locking pin slides on a surface of the standing portion, the locking pin can be automatically engaged with the first or second engaging hole.

Abstract: The invention is aimed at providing a battery forklift drive unit which makes a large space unnecessary for disposing brakes in the vicinities of drive units, thereby to achieve making the vicinities of drive units compact in a battery forklift. To this end, a second gear disposed in a drive case of the drive unit is formed inside with a space in which a wet type brake section is disposed and the wet type brake section comprises an inner disk whose entire inner periphery is attached to the second gear, an outer disk which lies opposite to the inner disk and whose entire outer periphery is attached to a side of the drive case, and a pressure plate for pressing together the inner and outer disks lying opposite to each other.

Abstract: A first engaging hole and a second engaging hole are formed in a fan-shaped standing portion which is fixed to a vehicle body frame and concentrically constructed with respect to a tilt direction of a the driver's cabin with a hinge shaft as a center of tilting. The first and second engaging holes respectively correspond to a tilt down position and a tilt up position of the driver's cabin. The standing portion is inserted into an actuating member fixed to a driver's cabin frame, and a locking pin urged by a spring is slidably disposed to the actuating member. Since the locking pin slides on a surface of the standing portion, the locking pin can be automatically engaged with the first or second engaging hole.

Abstract: A lift arm for a skid-steel loader, in which a pair of right and left lift arms 6, 6 are divided in two so that they are constituted as first arm portions 21 and second arm portions 22. Each of the first arm portions 21 is constituted as a long member which is constituted from a sheet metal material and a hollow portion is formed from a proximal end to a front end of the first arm portion. Reinforcing plate-shaped bodies 25A, 25B are fixed on both side faces from a central portion to the front end. Each of the second arm portions 22 is constituted from a plate-shaped body and constituted between a front wheel 3A and a loader main body 2 so as to be inserted loosely. With this structure, it is possible to provide the lift arm which enables an entire length of the skid-steer loader to be shortened.

Abstract: The operation control circuit of the present invention reduces the speed of an actuator, such as a rotation motor, according to reduction in the rotational speed of an engine. When the engine rotational speed is at its maximum, a pilot pressure in a pilot conduit is set to a relief pressure of a relief valve. When the engine rotational speed is reduced, the flow rate of pilot pressure hydraulic fluid decreases, and the pressure difference over a throttle section becomes smaller than the relief pressure, so that the pilot pressure is set to the pressure difference. Even if the operator operates an operation lever to a full stroke position the spool valve does not go to the fully opened state, since the pressure is low. As a result, the flow rate of hydraulic fluid supplied to the rotation motor is reduced, so that the speed of rotation is reduced.

Abstract: A function for authenticating an operator to control whether to permit them to operate a vehicle (20) can be added to the vehicle by simple modification. An operation permission control device (22) is installed on the vehicle (20). The operation permission control device (22) incorporates a relay inserted in the middle of a start signal line (47) connecting a key switch (46) and vehicle start circuit (48) (starter relay of an engine-powered vehicle or main controller of a battery-powered vehicle) and can open and close the start signal line (47). The operation permission control device (22) reads data of a authentication card (34) carried by the operator, collates the read data with preprogrammed data in a removable set memory a (32). If the data match, the device connects the start signal line (47) to enable start of the vehicle.