Mazda Motor Corporation

Exedy Corporation

Tokimori Saka

Norio Iwashita

Takamichi Teraoka

Naohiro Sakaue

Shinya Kamada

Tatsuhiko Iwasaki

Tatsutoshi Mizobe

Junichi Doi

Takashi Ishiyama

Yoshihiko Fujita

Hidetoshi Maeta

Kazuhiko Ueda

Hideo Toyota

Seiji Esaki

Satoshi Komori

Takeshi Kawamoto

Kensuke Ueda

Shinya Yamamoto

Takashi Takino

Esaki Seiji

A fluid transmission device is provided. The device comprises a rotatable case having a rotational axis, coupled to a drive source, and provided therein with a pump shell for integrally rotating with the case and a turbine shell facing the drive source side of the pump shell, a drive force being transmitted between the pump shell and the turbine shell via fluid, and a dynamic vibration absorber having a swing body and for reducing vibration caused by the drive source. The dynamic vibration absorber overlaps with at least one of the pump shell and the turbine shell in an axial direction of the case.

Fluid transmission device for vehicle

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.

An automatic transmission has first, second and third gear sets, first and second clutches, and first, second and third brakes. First, second and third sun gears, and a first carrier are interconnected with a second sun gear, a second carrier, a third carrier, an input shaft and an output gear, respectively. The first clutch selectively connects the first sun gear and the second sun gear to the input shaft, and the second clutch selectively connects the first ring gear and the second carrier to the input shaft. The first brake selectively connects the first ring gear and the second carrier to a casing. The second brake selectively connects the second ring gear and the third carrier to the casing, and the third brake selectively connects the third ring gear to the casing.

Automatic transmission

A torque converter includes at least two thrust bearings disposed on respective axially-opposite sides of a radially-inward portion of a stator. The stator includes a non-rotatable member, a rotatable member, and a one-way clutch. The rotatable member has a cylindrical portion having an inner peripheral surface interlocked with the one-way clutch, and an extension portion which extends from an approximately axially-central region of the cylindrical portion in a radially-outward direction relative to the cylindrical portion, and has an axial thickness less than that of the cylindrical portion. The thrust bearings are disposed to clamp the extension portion from respective axially-opposite sides of the extension portion at respective positions located radially outwardly relative to the cylindrical portion, so as to facilitate reduction in axial dimension of the torque converter.

There is provided an automatic transmission comprising a first shaft capable of receiving torque from an engine, and four planetary gear sets arranged coaxially on the first shaft and in series in an axial direction of the first shaft. Each of the four planetary gear sets has a single sun gear and a single ring gear. Further, the automatic transmission comprises an output wheel arranged coaxially on the first shaft, and capable of outputting torque transmitted from the engine through some of the four planetary gear sets. The output wheel is arranged between two of the four planetary gear sets. Accordingly, the noise or vibration from the planetary gear sets in the automatic transmission may be reduced, while the overall length of the first shaft may be made shorter, and the overall size of the automatic transmission may be made smaller.

Automatic transmission for automotive vehicles

There is provided a power coupling device comprising first and second coupling members, at least one of which is capable of rotating about a common axis and relative to each other. The first coupling member has a pocket, and the second coupling member has notches. The power coupling member also comprises first and second struts arranged at least partly in the pocket. Each of the first and second struts is urged to emerge from the pocket and capable of engaging with one of the notches. The first strut is capable of transmitting torque between the first and second coupling members only in a first direction, and the second strut is capable of transmitting torque between the first and second coupling members only in a second direction that is opposite to the first direction. The power coupling device further comprises first and second retainer plates arranged between the first and second coupling members capable of moving in a plane perpendicular to the common axis, for example, of rotating about the common axis, and independently from each other. The first retainer plate has a first hole which the first or second strut can pass through. The second retainer plates has a second hole which the first or second strut can pass through when the second hole is aligned with the first hole and the first or second strut. By moving the first and second retainer plates, this power coupling device can achieve the neutral state and the bidirectional lock state in addition to forward and reverse lock states.

Power coupling device

On an input shaft are provided in order from a side of an engine a torque converter with a lock-up clutch, a first planetary gear set as a multiplying mechanism, a counter drive gear outputting a rotational drive force to a countershaft, a second planetary gear set as a speed-change element, a third planetary gear set as a speed-change element. Accordingly, there can be provided an automatic transmission for six forward speeds with plural planetary gear sets, clutches and brakes that can properly reduce a clutch capacity and restrain gear noises with its compact and light-weighted structure.

An automatic transmission is provided comprising a transmission case, a first shaft housed in and rotationally supported by said transmission case, and capable of receiving torque from an engine, a first shifting gear mechanism arranged coaxially with the first shaft, and a second shifting gear mechanism including a second planetary gear set. The second planetary gear set is housed within the transmission case and arranged coaxially with the first shaft, one of its sun and ring gears is capable of rotating together with the input shaft, and the other of the sun and ring gears is fixed to the transmission case. The automatic transmission further comprises first and second frictional elements arranged at least partly overlapped with the second planetary gear set in the axial direction between the planetary gear set and the transmission case in the radial direction. Accordingly, the plurality of frictional elements may be arranged on a shorter shaft without excessively increasing the radial size of the automatic transmission.

In an automatic transmission (AT) in which an input shaft (Input) and an output gear (Output) are disposed on the same axis and three clutches (C-C) and two brakes (B, B) are selectively operated to provide six forward speeds, first and second planetary gear sets (GS, GS) are configured to consistently reduce the speed of input rotation and output the speed-reduced rotation, thereby enabling downsizing of them. The first and second planetary gear sets (GS, GS) are arranged in a transmission case at both the axial ends thereof. Third and fourth planetary gear sets (GS, GS) are connected to each other to have four rotation elements in combination, thereby constituting a Simpson planetary gear train. One of the four rotation elements (a fourth carrier (PC) in an illustrated example) is connected to the output gear (Output). Rotations input and reduced in speed by the first and second planetary gear sets (GS, GS) are input to sun gears (S, S) of the third and fourth planetary gear sets (GS, GS), respectively. First to third clutches (C-C) and a first brake (B) are arranged to surround the first and second planetary gear sets (GS, GS).

A torque converter is provided for transmitting torque from an engine output shaft to an input shaft of a transmission. The torque converter includes a pump, connected with the engine output shaft, which includes a shell portion disposed at an outer portion thereof, a core portion disposed at an inner portion thereof and a plurality of blades disposed between the shell portion and the core portion. A turbine is disposed facing the pump and is driven by the pump through hydraulic fluid. The turbine includes a shell portion disposed at an outer portion thereof, a core portion disposed at an inner portion thereof and a plurality of blades disposed between the shell portion and the core portion. A stator is disposed between the pump and the turbine for torque amplification. The core portion and blades of the turbine include respective radial outer edges, the core portion and blades of the pump include respective radial outer edges, and the radial outer edges of the blades of at least one of the pump and the turbine project beyond the radial outer edge of the core portion thereof toward the facing blades of the other.

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Hiroshima, Japan

Tokimori Saka