Abstract: A fluid type power transmission system includes a fluid type power transmission device and a control part. The fluid type power transmission device includes an inlet part and an outlet part for a working fluid. The fluid type power transmission device is configured to transmit power in response to circulation of the working fluid in the interior thereof. The control part is configured to control a pressure of the working fluid in the inlet part by regulating a pressure of the working fluid in the outlet part of the fluid type power transmission device.

Abstract: A lubricating oil supply control device controls a lubricating oil supply amount to a transmission in a construction machine including a torque converter with a lock-up clutch. The lubricating oil supply control device includes a clutch state determining section, a lubricating oil amount detecting section and a lock-up clutch controlling section. The clutch state determining section determines whether or not the lock-up clutch is being coupled. The lubricating oil amount detecting section detects whether or not the lubricating oil supply amount to the transmission is short of a preliminarily set supply amount. The lock-up clutch controlling section decouples the lock-up clutch when the lock-up clutch is being coupled and the lubricating oil supply amount is short of the preliminarily set supply amount.

Abstract: A transmission for an industrial vehicle has an input shaft; first and second transmission mechanisms each having a plurality of speed-change steps; a second transmission mechanism; a clutch mechanism; a rotation direction switching mechanism; and an output shaft. The clutch mechanism is disposed on the input side of the first and second transmission mechanisms and is provided with a forward clutch and a reverse clutch for switching between forward and reverse travel, and is further provided with first and second snap clutches for selecting which of the first and second transmission mechanisms will receive rotational input from the engine. The rotation direction switching mechanism is a mechanism for switching the direction of rotation inputted to the first transmission mechanism or the second transmission mechanism to the direction of rotation for forward travel or the direction of rotation for reverse travel in accordance with the switching of forward and reverse travel.

Abstract: Provided is a device for performing speed change not leading to engine stall in a working vehicle such as a wheel loader while sustaining a required tractive force and reducing fuel consumption. When a speed (“forward”, “second speed”) suitable for a work is selected by a speed change operator, control means makes a modulation clutch engaged in response to the vehicle speed drop and makes a lock-up state where a lock-up clutch is engaged transit to a lock-up and modulation clutch slip state where the lock-up clutch is engaged while the modulation clutch slips. Subsequently, the control means performs a clutch control for causing a transition to both clutch slip state where the lock-up clutch and the modulation clutch slip in response to the vehicle speed drop, hence causing the transition to a torque converter operation state where the modulation clutch is engaged and the lock-up clutch is released.

Abstract: A construction vehicle includes a control unit configured to shift gear after performing pre-shifting to couple a target speed-change gear that corresponds to a target speed with a target speed-change shaft in non-transmitting state of rotation of the input shaft when the gear shift is performed from a current speed to the target speed, in a state in which the current speed gear that corresponds to the current speed step and the current speed-change shaft that corresponds to the current speed gear are coupled. When the vehicle speed detected by the vehicle speed detecting section is zero, the control unit is configured to perform pre-shift auxiliary control prior to the pre-shifting control to input the rotation of the input shaft to the target speed-change shaft in a state in which the target speed-change shaft is not coupled to the plurality of speed-change gears.

Abstract: A lubricating oil supply control device controls a lubricating oil supply amount to a transmission in a construction machine including a torque converter with a lock-up clutch. The lubricating oil supply control device includes a clutch state determining section, a lubricating oil amount detecting section and a lock-up clutch controlling section. The clutch state determining section determines whether or not the lock-up clutch is being coupled. The lubricating oil amount detecting section detects whether or not the lubricating oil supply amount to the transmission is short of a preliminarily set supply amount. The lock-up clutch controlling section decouples the lock-up clutch when the lock-up clutch is being coupled and the lubricating oil supply amount is short of the preliminarily set supply amount.

Abstract: A fluid type power transmission system includes a fluid type power transmission device and a control part. The fluid type power transmission device includes an inlet part and an outlet part for a working fluid. The fluid type power transmission device is configured to transmit power in response to circulation of the working fluid in the interior thereof. The control part is configured to control a pressure of the working fluid in the inlet part by regulating a pressure of the working fluid in the outlet part of the fluid type power transmission device.

Abstract: Provided is a device for performing speed change not leading to engine stall in a working vehicle such as a wheel loader while sustaining a required tractive force and reducing fuel consumption. When a speed (“forward”, “second speed”) suitable for a work is selected by a speed change operator, control means makes a modulation clutch engaged in response to the vehicle speed drop and makes a lock-up state where a lock-up clutch is engaged transit to a lock-up and modulation clutch slip state where the lock-up clutch is engaged while the modulation clutch slips. Subsequently, the control means performs a clutch control for causing a transition to both clutch slip state where the lock-up clutch and the modulation clutch slip in response to the vehicle speed drop, thence causing the transition to a torque converter operation state where the modulation clutch is engaged and the lock-up clutch is released.

Abstract: A construction vehicle includes a control unit configured to shift gear after performing pre-shifting to couple a target speed-change gear that corresponds to a target speed with a target speed-change shaft in non-transmitting state of rotation of the input shaft when the gear shift is performed from a current speed to the target speed, in a state in which the current speed gear that corresponds to the current speed step and the current speed-change shaft that corresponds to the current speed gear are coupled. When the vehicle speed detected by the vehicle speed detecting section is zero, the control unit is configured to perform pre-shift auxiliary control prior to the pre-shifting control to input the rotation of the input shaft to the target speed-change shaft in a state in which the target speed-change shaft is not coupled to the plurality of speed-change gears.

Abstract: A transmission for an industrial vehicle has an input shaft; first and second transmission mechanisms, each having a plurality of speed-change steps; a second transmission mechanism; a clutch mechanism; a rotation direction switching mechanism; and an output shaft. The clutch mechanism is disposed on the input side of the first and second transmission mechanisms and is provided with a forward clutch and a reverse clutch for switching between forward and reverse travel, and is further provided with first and second snap clutches for selecting which of the first and second transmission mechanisms will receive rotational input from the engine. The rotation direction switching mechanism is a mechanism for switching the direction of rotation inputted to the first transmission mechanism or the second transmission mechanism to the direction of rotation for forward travel or the direction of rotation for reverse travel in accordance with the switching of forward and reverse travel.

Abstract: A variable displacement oil hydraulic motor designed to have its axial size minimized is disclosed, which comprises: a cylinder block receiving a plurality of pistons in pressure contact with a slanting surface of a swash plate variable in its angle of inclination, a motor housing accommodating the cylinder block therein; and at least one swash plate inclination changing piston which is disposed at a given circumferential position in an annular space defined between an outer periphery of the cylinder block and an inner periphery of the motor housing and which is movable bidirectionally in a direction parallel to the abovementioned pistons to alter the angle of inclination of the swash plate.

Abstract: A detector switch of the present invention is capable of confirming that an electrical signal from a controller to an electromagnetic valve has been transformed into the operation of a control valve spool when the speed of a transmission of automobiles or construction machines is changed. To achieve this, in a transmission having control valves having a spool (3) for changing the hydraulic pressure of a transmission clutch, a controller (5) for turning ON and OFF electromagnetic valves (2.sub.1, 2.sub.2, 2.sub.3,) the control valves (1.sub.1, 1.sub.2, 1.sub.3) are provided with a detector switch (7) which is capable of transmitting a signal to the controller (5) when the spool (3) abuts against the switch (7).