11 results about "Automatic transmission" patented technology

A vehicle includes a front-wheel drive (FWD) transmission having a case, a selectable one-way clutch (SOWC) indexed to the case, pressurized fluid, and a valve body assembly (VBA). The VBA has a piston in communication with the fluid, a return spring, and an actuator plate in continuous contact with or connected to each of the piston and a shift lever of the SOWC. Fluid moving the piston and plate in one direction locks the SOWC to enable a reverse mode, and the spring moves the piston and the plate in another direction to unlock the SOWC in a forward mode. A method prevents spin losses in the FWD transmission by positioning a two-mode SOWC within a case, positioning a VBA adjacently and externally to the case, and admitting pressurized fluid into the VBA to engage the SOWC only during a reverse operating mode.

In an embodiment of the present invention, a piston apparatus of an automatic transmission includes a piston member capable of moving in the axial direction of the rotation shaft, and a hydraulic chamber, and has been configured so that the piston member moves in the axial direction due to pressure in the hydraulic chamber. The piston member includes a cylinder part that extends in the axial direction and to which pressure in the hydraulic chamber is transmitted, a pressing part that extends in the radial direction and presses against a friction engaging element of the automatic transmission, and a connecting part that connects the cylinder part and the pressing part and, with respect to the axial direction, is offset from the pressing part in a direction of separation from the friction engaging element. Also, the axial direction offset amount of the connecting part from the pressing part of the piston member has been set larger than the stroke amount of the piston member.

The invention discloses three clutches. The three clutches comprise clutch input shafts, clutch output shafts and clutch pieces; three annular piston ejector rod sets movably connected and consistingof columnar piston ejector rods are arranged at the back ends of three clutch ring piece sets; and the three piston ejector rod sets penetrate through piston ejector rod through holes formed in secondand third driving tooth sleeve fixed discs, and are fixedly connected with a first clutch piston, a second clutch piston and a third clutch piston in a first clutch oil cylinder, a second clutch oilcylinder and a third clutch oil cylinder arranged on clutch oil cylinder fixed walls. The three clutches have the beneficial effects of capability of eliminating the gear shifting hesitation phenomenon of double-clutch automatic transmissions and capability of relieving high temperature and wear of the clutches; and the clutch piece sets are short in distance from the oil cylinders, and are reasonably stressed, so that the size and the cost of the clutches are reduced.

An automatic transmission (1) is provided. One embodiment of the automatic transmission may include a valve body (42-44) including control valves for hydraulically controlling a friction engaging element provided within said transmission; an electric control unit (25) located on said valve body (44) for controlling gear shifting of said automatic transmission; a peripheral wall (51) surrounding a transmission case (6) of the gear shift mechanism, and an outer wall (52) of the transmission case (6) provided adjacent to said peripheral wall (51), and a containing space (53) formed by the peripheral wall (51), said outer wall (52) and said valve body (44); wherein said electric control unit (25) is located within a containing space (53). Adopting said structure, the electric control unit is provided at the position not easily damaged by high temperature fluid in the transmission case.

An automatic transmission gear-shifting control method used under the working condition of misoperation comprises the steps that whether the working condition of misoperation exists or not is judged under the braking-free working condition in real time, namely the detected frequent accelerator stepping times exceeds a preset accelerator stepping time threshold within a judgment time limit, and it is satisfied that the gear difference before and after an accelerator stepping action occurs each time exceeds a preset gear difference threshold; a transmission can optimize gears under the working condition of misoperation within a locking time to assist driving. By the adoption of the automatic transmission gear-shifting control method, abrasion of a synchronizer and a clutch can be effectively decreased, and too quick temperature rise of the clutch is avoided to reduce the discomfort possibly brought by frequent gear shifting.

The invention relates to an insulation transmission device, in particular to an insulation aerial ladder transmission device adaptive to the ultra high voltage charged environment. The insulation aerial ladder transmission device comprises an insulator assembly, a hoisting unit, a base and a trangle support. One end of the insulator assembly is connected to the base, the trangle support is slidably connected to the insulator assembly, the hoisting unit is arranged at the end of the insulator assembly connected to the base and is connected to the trangle support. The trangle support moves on the insulator assembly through the hoisting unit. By the aid of the insulation aerial ladder transmission device, automatic transmission of a device in strong electromagnetic field environment is realized.

In a control device for an automatic transmission, necessary supply of a lubricant is controlled according to a traveling state of a vehicle to achieve both an improvement in fuel efficiency, and assurance of durability of vehicle-propelling friction engagement elements and other friction engagement elements of the transmission. The control device for an automatic transmission is provided with: alubricating oil supply control unit for controlling the supply of lubricating oil to a vehicle-propelling friction engagement element and an other friction engagement element; and an other friction engagement element temperature detection unit for detecting the temperature of the vehicle-propelling friction engagement element and the temperature of the other friction engagement element. The lubricating oil supply control unit controls the amount of lubricating oil supplied to the vehicle-propelling friction engagement element in accordance with the temperature of the vehicle-propelling friction engagement element and the amount of lubricating oil supplied to the other friction engagement element in accordance with the temperature of the other friction engagement element.