Honda Giken Kogyo Kabushiki Kaisha

Shigeo Ozawa

Takashi Aoki

Takamichi Shimada

Satoshi Terayama

Hiroshi Nakayama

Yoshihisa Iwaki

Noboru Sekine

Kouji Fukuda

Toshitaka Imai

Yasuyuki Suzuki

Eiji Kitsutaka

A plate member ( ) is mounted on a supporting frame ( ). The periphery of the plate member ( ) is firmly secured by a clamp ( ) and a concave die-shaped lower pushing member ( ) is caused to rise from below. The lower pushing member ( ) is provided with a forming concave area ( ) and a forming convex area ( ). Disposed above the plate member ( ) is a bar-shaped upper pushing member ( ) which is lowered to push against the plate member ( ). In such a condition, the plate member ( ) is caused to rise together with the lower pushing member ( ) and move in the directions of X and Y to form convex areas ( ) and ( ) within the forming concave area ( ) and the forming convex area ( ). The upper pushing member ( ) is provided with a main body ( ) of high rigidity and a flexible member ( ). The flexible member ( ) is formed in a hemispherical shape and made of material more elastic than the main body ( ) which is made of hard polyurethane or the like, thereby making spherical contact with the plate member ( ).

Sequential forming device

A hydraulic clutch (40) for u se in an automotive automatic transmission includes a clutch drum (41) having a hydraulic pressure chamber (43), a piston (42) movably fitted in the clutch drum (41) in covering relation to the hydraulic pressure chamber (43), a pressure plate (45) disposed in confronting relation to a surface of the piston (42) remotely from the hydraulic pressure chamber (43), and interleaved drive and driven plates (46, 47) disposed in confronting relation to a surface of the pressure plate (45) remotely from the piston (42). The drive and driven plates (46, 47) are engageable with each other by the pressure plate (45) pressed by the piston (42) moved in response to a hydraulic pressure supplied to the hydraulic pressure chamber (43). An assisting member (44) is disposed between the piston (42) and the pressure plate (45) and comprises an annular array of rigid assisting levers (44a) and a retaining plate (44b) holding the assisting levers (44a) together. The assisting member (44) has a radially inner and pressable by the piston (42), a radially outer end held in engagement with the clutch drum (41), and a radially intermediate region engageable with a projection (45a) of the pressure plate (45). The assisting lever serves (44a) as a lever with the radially outer end as a fulcrum for boosting the force applied from the piston (42) and transmitting the boosted force to the pressure plate (45).

Hydraulic clutch construction

If the accelerator pedal condition is a power-on condition and the gearshift type is an upshift, or the accelerator pedal condition is a power-off condition and the gearshift type is a downshift, then a torque for engaging the next-gear-position gearshift means is established based on the engine torque to be transmitted from the engine to the next-gear-position gearshift means, and an inertia torque required to make the rotational speed of the input member of the next-gear-position gearshift means vary as desired with respect to the gearshift. If the accelerator pedal condition is a power-on condition and the gearshift type is a downshift, or the accelerator pedal condition is a power-off condition and the gearshift is an upshift, then the ratio between the rotational speeds of the input and output members of the next-gear-position gearshift means is detected. The torque for engaging the next-gear-position gearshift means is lowered after the gearshift is started until the detected rotational speed ratio reaches a predetermined value. After the detected rotational speed ratio has reached the predetermined value, the engaging torque is set to a vaslue large enough to engage the gearshift means.

Apparatus for controlling gearshifts in automatic transmission using

When a gearshift command for a power-on/downshift or power-off/upshift mode is issued, the magnitude of a change in the engine rotational speed due to the gearshift is calculated from the vehicle speed or the engine rotational speed when the gearshift starts to be effected and the gear ratio of a gear position to be reached by the gearshift. If the magnitude of the engine speed change is large, then a hydraulic control pressure is lowered for a certain period of time to advance the timing of operating of a hydraulic pressure release valve to quickly disengage a previous-gear-position clutch. If the magnitude of the engine speed change is small, then the control pressure is increased to delay the timing of operation of the hydraulic pressure release valve to allow the previous-gear-position clutch to be disengaged after a next-gear-position clutch starts to be engaged.

Apparatus for controlling gearshifts in automatic transmission

An automatic transmission shift controlling method for preventing both excessive delays in speed ratio shifts and multiple shifts in close succession in response to two different shift commands in a short time period. When a first shift command is issued, the input and output rotational speed ratio of a shift device associated with a first target speed range for selecting a power transmission path associated with the first target speed range and determined by the first shift command is detected, and the start of operation of the shift device associated with the first target speed range is detected by checking whether the input and output rotational speed ratio has started to vary or not. When a second gear-shift command is issued after the first shift command has been issued but before the start of operation of the shift device is detected, the second shift command is accepted.

Growing community of inventors

Saitama, Japan

Shigeo Ozawa