Mazda Motor Corporation

Exedy Corporation

Takashi Ishiyama

Norio Iwashita

Tokimori Saka

Tomokazu Kinoshita

Hiroyuki Okayama

Fumitoshi Sato

Masuhiro Kawakami

Hidetoshi Maeta

Takeshi Kawamoto

Shotaro Nagai

Keitaro Kageyama

Takuya Sugisawa

A hydraulically actuated transmission includes a reducing valve provided at a lubricant oil supplying circuit and configured to reduce a pressure of a lubricant oil having a predetermined pressure and output the lubricant oil with a reduced pressure; and a switching device (switching valve) configured to selectively switch between a first path and a second path as the path for supplying the lubricant oil from the reducing valve to a to-be-lubricated portion. The reducing valve is configured such that an output pressure of the lubricant oil from the reducing valve is higher when the second path is selected by the switching device, than when the first path is selected by the switching device.

Hydraulically actuated transmission

A power train device for a vehicle is provided with a selector valve that is switched between a first state in which oil discharged from an electric oil pump is able to be supplied as a hydraulic fluid to an engagement hydraulic chamber of a vehicle-starting frictional engagement element, and a second state in which the oil is able to be supplied as a lubricating oil to the vehicle-starting frictional engagement element through a first lubricating oil supply circuit, depending on a magnitude of a discharge pressure of a mechanical oil pump.

Power train device for vehicles

A hydraulically operated transmission includes: a pressure regulator which regulates pressure of a hydraulic oil supplied to a coupling hydraulic chamber of a frictional coupling element for starting a vehicle; and a lubrication control valve provided at a lubricant oil supplying circuit for supplying the lubricant oil to the frictional coupling element. The lubrication control valve operates, in coupling the frictional coupling element at start of the vehicle, such that the lubricant oil is supplied to the frictional coupling element at a greater flow rate when a regulated pressure regulated by the pressure regulator is lower than a second predetermined pressure, than when the regulated pressure is higher than or equal to the second predetermined pressure. The second predetermined pressure is set to be higher than or equal to a first predetermined pressure, at which the frictional coupling element is completely coupled, and to be lower than a high pressure.

Hydraulically operated transmission

A hydraulically actuated transmission includes a selecting switching valve configured to selectively switch between a first switching valve and a second switching valve as a valve to be connected with an outlet port of a solenoid valve. The selecting switching valve is configured to operate in response to a hydraulic pressure applied to a specific frictional coupling element (second brake) in accordance with coupling and releasing of the specific frictional coupling element, and is configured to connect the outlet port with the first switching valve while the hydraulically actuated transmission is in high gear which is higher than or equal to a predetermined gear, and connect the outlet port with the second switching valve while the hydraulically actuated transmission is in the low gear which is lower than the predetermined gear.

Provided is a torque converter () which comprises: a casing () coupled to an output shaft of an engine; a torus (T) defined by a pump (), a turbine () and a stator () each disposed within the casing (); a multi-plate lockup clutch () adapted to directly couple the turbine () and the casing (); and a lockup damper () adapted to absorb shock during engagement of the lockup clutch (). The lockup clutch () and the lockup damper () are arranged within a space between the torus (T) and a surface of the casing () on the side of the engine, in an axially overlapping relation. The lockup clutch () is disposed on a radially inner side with respect to a widest region (T) of the torus (T), and the lockup damper () is disposed on a radially outer side with respect to the widest region (T). This makes it possible to engage the lockup clutch () with excellent response while suppressing shock, and shorten an overall length of an automatic transmission.

Torque converter

A torque converter includes, in a case coupled to an output shaft of an engine, a torus formed from a pump, a turbine and a stator having a one-way clutch on the inside thereof, and a lock-up clutch. In addition, in this torque converter, a fluid from a pump is introduced from a space between a stator shaft (F) and a turbine shaft (F), and discharged from a space between a pump sleeve () and the stator shaft (F) through a space where the lock-up clutch is disposed and the torus. Moreover, this torque converter further includes a seal member () which is disposed at a side that is closer to the engine than a spline engagement part (P) of an inner race () and the stator shaft (F), and seals a space between an inner peripheral face of the inner race () and an outer peripheral face of the stator shaft (F).

Disclosed is a torque converter () which comprises: a casing () coupled to an output shaft of an engine; a torus (T) defined by a pump (), a turbine () and a stator () each disposed within the casing (); a lockup clutch () adapted to directly couple the turbine () and the casing (); and a lockup damper () adapted to absorb shock during engagement of the lockup clutch (). The turbine () has an outer peripheral portion () bulging toward the engine to define a part of the torus (T), an inner peripheral portion () located on the side of the engine with respect to a one-way clutch () supporting the stator (), and an intermediate portion () formed to be concaved toward a side opposite to the engine, in a radial position between the outer peripheral portion () and the inner peripheral portion (). A part () of the lockup damper () is disposed on the side of the engine with respect to the intermediate portion () and in a position axially overlapping with the torus (T). This makes it possible to allow a torque converter to be axially downsized.

Growing community of inventors

Higashihiroshima, Japan

Takashi Ishiyama