Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Toyota Gosei Co., Ltd.

Motoki Tabuchi

Takaho Kawakami

Hirotsugu Yoshino

Atsushi Honda

Naoyuki Kishimoto

Isamu Shiotsu

Seiji Kuwahara

Fusahiro Tsukano

Masami Sugaya

Daisuke Okamoto

Hironori Asaoka

Tomoe Osada

Shinya Sakai

Katsuhisa Ota

Junko Ichikawa

Tatsuya Hirano

Yoshito Arihata

An automatic transmission includes a main transmission and an auxiliary transmission. The auxiliary transmission includes an auxiliary-transmission-side planetary gear mechanism, a first clutch, and a second clutch. The auxiliary-transmission-side planetary gear mechanism is provided between a pair of main-transmission-side planetary gear mechanisms, and a part of the auxiliary-transmission-side planetary gear mechanism is located within the main transmission. The first clutch fixes rotation of a sun gear of the auxiliary-transmission-side planetary gear mechanism. The second clutch connects a ring gear of the auxiliary-transmission-side planetary gear mechanism with the sun gear.

Automatic transmission

A transmission includes: a plurality of annular first engagement members; a fitting member having outer teeth spline-fitted to inner teeth of the first engagement members, the fitting member being configured to be rotatable around a predetermined rotation axis; a plurality of annular second engagement members configured to be engaged with the first engagement members; a lubricating oil supply portion configured to supply a lubricating oil to the fitting member; and a transmission case configured to accommodate the first engagement members, the fitting member, the second engagement members, and the lubricating oil supply portion. The lubricating oil supply portion is provided on an inner wall of the transmission case, and a discharge portion of the lubricating oil supply portion which ejects the lubricating oil is configured to eject the lubricating oil toward a portion where the first engagement members and the fitting member are spline-fitted to each other.

Transmission

A first valve is disposed in an oil passage through which the engaging pressure generated by a linear solenoid valve is supplied to A second brake. The first valve is closed when the second brake is released, so as to close the oil passage, and is opened when the second brake is engaged, so as to open the oil passage. A second valve is disposed in a lubricating oil passage through which lubricating oil is supplied to the second brake, and communicates with the linear solenoid valve. The second valve is opened when the engaging pressure is supplied from the linear solenoid valve, so as to open the lubricating oil passage, and is closed when no engaging pressure is generated by the linear solenoid valve.

Lubricating system for engagement mechanism

A clutch apparatus includes a clutch drum and a band. The clutch drum includes spline large-diameter portions protruding outward in a radial direction of the clutch drum and spline small-diameter portions protruding inward in the radial direction. The spline large-diameter portions and the spline small-diameter portions are arranged alternately in a circumferential direction of the clutch drum. The band is wound around an outer peripheral portion of the clutch drum, and is made of carbon fiber reinforced plastic. The spline large-diameter portions are provided with a protrusion protruding outward in the radial direction. The band includes a recessed portion with which the protrusion is engaged. The recessed portion is provided at a position at which the recessed portion faces the protrusion.

Clutch apparatus of transmission for vehicle

In an attachment structure for an oil guide plate including an oil guide plate and a seal member, the seal member is disposed at an edge part of the oil guide plate along an outer peripheral end portion, the seal member is an elastic body element protruding from both sides of the oil guide plate in a plate thickness direction, a pair of facing surfaces facing each other and pinching the edge part from both sides of the edge part in the plate thickness direction is disposed in a fixing portion in the case where the oil guide plate is attached, and the fixing portion pinches and compressively deforms the seal member with the pair of facing surfaces and supports the oil guide plate via the seal member.

Attachment structure for oil guide plate

In an oil passage structure for a power transmission device including a case provided to accommodate a power transmission device, a baffle plate attached to an inner wall of the case, and an oil pump, the oil passage structure includes a supply oil passage through which oil is pumped from the oil pump to an oil supply destination via the baffle plate. A plate oil passage, which constitutes a portion of the supply oil passage, a supply port, which allows the oil discharged from the oil pump to flow into the plate oil passage through the supply port, and a first discharge port, which allows the oil supplied to the oil supply destination to be discharged through the first discharge port, are formed in the baffle plate.

Oil passage structure for power transmission device

In an oil passage structure for a power transmission device including a case provided to accommodate a power transmission device, a baffle plate attached to an inner wall of the case, and an oil pump, the oil passage structure includes a supply oil passage through which oil is pumped from the oil pump to an oil supply destination via the baffle plate. The baffle plate has a structure in which two members of a plate body and a plate-shaped auxiliary member are superposed and integrated with each other. The baffle plate is provided with a plate oil passage that constitutes a portion of the supply oil passage and passes through the inside of the baffle plate. The plate oil passage is formed by a recess provided in at least one of a surface of the plate body and a surface of the auxiliary member which face to each other such that the auxiliary member is interposed on the plate body.

A meshing-type engagement device includes a first member, a second member, a pressing mechanism, and a reaction force mechanism. The first member is provided with a plurality of first dog teeth. The second member is provided with a plurality of second dog teeth. The pressing mechanism is configured to press the first member to the second member side. The reaction force mechanism is configured to generate a reaction force with respect to a pressing force pressing the first member for the first dog teeth and the second dog teeth to mesh with each other such that the amount of increase in the reaction force with respect to a movement of the first member is larger at a position further on the second member side than a predetermined position compared to the amount of increase to the predetermined position when the first member is pressed.

Meshing-type engagement device

A translational force Fh to one side in a rotational axis direction is caused to act from a hydraulic piston to a sleeve when an engaged stage between an engagement tooth and an engaged tooth is maintained, so that translation of the sleeve to the other side in the rotational axis direction and consequent disengagement of the engagement tooth and the engaged tooth can be prevented. Therefore, the engaged state between the engagement member and the engaged member can be stably maintained regardless of the condition of the torque acting from the drive source to the engagement member.

Engagement device and automatic transmission

A control system for a meshing type engagement mechanism includes a meshing type engagement mechanism and an electronic control unit. The electronic control unit is configured to allow a fluid chamber to be filled with a fluid by putting a switching valve into a cut-off state after respective dog teeth mesh with each other by a second member reaching a predetermined position determined in advance in response to a fluid pressure of the fluid chamber such that the second member is pressed in the direction in which the second member is separated from a first member by a release force depending on the torque transmitted between a surface of a first tooth and a surface of a second tooth, the fluid pressure of the fluid chamber is increased, and an engagement state between the first member and the second member is maintained by the fluid pressure which is increased.

Control system for meshing type engagement mechanism

A toroidal continuously variable transmission includes: an input disk; an output disk; a plurality of power rollers; a plurality of trunnions; an oil pump; a pressing hydraulic mechanism that moves and brings the input disk and output disk closer to each other; a shifting hydraulic mechanism that moves the trunnions forward and rearward; and a hydraulic control device that controls the pressing hydraulic mechanism and the shifting hydraulic mechanism by oil pressure. The hydraulic control device has an oil pressure regulation unit that sets an oil pressure in a shifting hydraulic line that is a hydraulic source of the shifting hydraulic mechanism to an oil pressure at which shifting control can be performed by the shifting hydraulic mechanism till the transmission of power between the input disk and output disk is interrupted when the operation of the oil pump is stopped.

Growing community of inventors

Mishima, Japan

Motoki Tabuchi