Musashi Seimitsu Industry Co., Ltd.

Ryosuke Asai

Shinya Matsuoka

Kazuma Oyaizu

Naofumi Butta

Takahisa Tanaka

Hoa Binh Nguyen

Shiryu Kato

A transmission device includes a transmission unit housed inside a transmission case with an oil storing part at a bottom part of the transmission case. As viewed in a projection plane orthogonal to a rotation axis of the transmission unit, an oil capturing part is arranged in a semicircle part of an outer circumferential wall of the transmission case. The semicircle part starts at a deepest part of the oil storing part and is positioned on a front side in a normal direction of a carrier.

Transmission device

Provided is a transmission device including a differential case. The differential case includes at least a part of a contamination pouch. The contamination pouch includes an inlet facing into a body part of the differential case and capable of collecting a contamination in an oil inside the body part. In an inner surface of the differential case, the inlet is arranged in a largest inner diameter part on which a largest centrifugal force acts during rotation of the differential case, or arranged closer to an oil discharging port with respect to the largest inner diameter part in an axial direction.

Provided is a transmission device including a differential case. The differential case is configured to be divided into first and second cases defining therebetween a mechanism chamber housing a differential mechanism therein and capable of storing an oil at a bottom part of the mechanism chamber. Two or more planetary gears are pivotally supported by a carrier of a gear reducer in the vicinity of large-diameter gear parts and pivotally supported by the differential case in the vicinity of small-diameter gear parts. The second case is held between the first case and the carrier coupled to the first case, whereby the second case is fixed to the first case.

Provided is a transmission device including a transmission unit, in which a differential device is arranged on one side in an axial direction and a gear reducer is arranged on the other side in the axial direction. The transmission unit is housed inside a transmission case with an oil storing part at a bottom part of the transmission case. A differential case () includes a body part (); an oil introducing port () open to the one side in the axial direction thereof; and an oil discharging port () open to the other side in the axial direction. A large-diameter gear part (P), which revolves in the same direction as a carrier (C) rotates, is arranged such that a bottom part thereof in a revolution trajectory is dipped below an oil storing surface (f) of an oil storing part (O) at the bottom part of the transmission case (). In the transmission case (), a first oil guide (G) is provided so as to extend toward the one side in the axial direction from a position radially outward of the revolution trajectory for capturing an oil lifted up from the oil storing part (O) by the large-diameter gear part (P) revolving and for guiding the same to the oil introducing port (). Consequently, even when an oil surface of the oil storing part is set to a low level, the oil lifted up by the large-diameter gear part of the planetary gear can be efficiently supplied into the differential case, which suppresses a churning resistance of the oil and improves transmission efficiency.

A transmission device includes a planetary reduction gear and a differential device, wherein a carrier of the reduction gear is dividedly formed from a first carrier portion that supports one end side of a pivot shaft and a second carrier portion that supports the other end side of the pivot shaft, and has a power-transmission case that is supported on a transmission case and includes a power-transmission case main body in which the differential case and the second carrier portion are integrated and the first carrier portion, which is joined to one end wall of the power-transmission case main body, a bearing boss portion is integrally and projectingly provided on a side face, on the sun gear side, of the one end wall, the bearing boss portion extending toward the sun gear side and having an outer peripheral part of one of output shafts rotatably fitted into and supported thereby, the bearing boss portion is present at a position where it overlaps the sun gear at least partially in an axial direction, and an outer peripheral part of the bearing boss portion is relatively rotatably fitted into a center hole of the sun gear.

A transmission device includes a power-transmission case having a carrier of a reduction gear and a differential case joined to the carrier is supported in a transmission case via case support bearings, a specific planetary gear portion of a planetary gear is disposed on one side of a differential mechanism in an axial direction, and the specific case support bearing is disposed on the other side thereof An oil passage-forming body is provided on an inner wall of the transmission case, the oil passage-forming body comprising an oil collection part that opens upward and can collect lubricating oil splashed up in an area around the specific planetary gear portion within the transmission case accompanying rotation of the power-transmission case, and an oil reservoir part that is continuous from the oil collection part, stores lubricating oil collected by the oil collection part, and supplies the lubricating oil to the specific case support bearing.

A transmission device is formed by combining a planetary gear-type reduction gear and a differential device, wherein at least one of first and second planetary gear portions in a two-stage planetary gear has gear teeth that receive a thrust load due to meshing with opposing gear, a power-transmission case formed by joining a carrier to a differential case is rotatably supported on a transmission case. A pivot shaft of the planetary gear has one end thereof on the first planetary gear portion side supported on the power-transmission case via a first bearing and the other end on the second planetary gear portion side supported on the power-transmission case via a second bearing, and the thrust loads on one side and on the other side in an axial direction are supported only by the first bearing among the first and second bearings. Thus, a wall portion of the power-transmission case pivotably supporting the second planetary gear portion is reduced in size in the radial direction, contributing to a reduction in size of the transmission case in the radial direction.

An engagement-type clutch mechanism is provided in which due to the movement of a first power transmission member, which is movably supported on a rotating shaft, toward a second power transmission member, a first and second projecting parts provided on opposing faces of a first and second power transmission members are engaged to each other, and the rotation of the second power transmission member is synchronized with the rotation of the first power transmission member, and due to the movement of a sleeve toward the synchronized second power transmission member, a first spline of the first power transmission member is linked to a second spline of the second power transmission member via a to-be-engaged spline of the sleeve, and the rotation of one of the rotating shaft and the second power transmission member is transmitted to the other of the rotating shaft and the second power transmission member.

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Toyohashi, Japan

Ryosuke Asai