Abstract: A protocol conversion device includes a converter and a communicator. The converter makes a protocol conversion of vehicle data acquired from a vehicle by communication based on a first protocol, into vehicle data in a format of HTTP or HTTPS as a second protocol. The vehicle data is directed to diagnosis of the vehicle. The communicator transmits the vehicle data protocol-converted by the converter, to a communication terminal that is able to execute, by communication based on the second protocol, a vehicle diagnosis program held by a web server. The converter makes a protocol conversion of data transmitted from the communication terminal by the communication based on the second protocol, into data in a first protocol format. The communicator transmits, to the vehicle by the communication based on the first protocol, the data in the first protocol format that is protocol-converted by the converter.

Abstract: A protocol conversion device includes a converter and a communicator. The converter makes a protocol conversion of vehicle data acquired from a vehicle by communication based on a first protocol, into vehicle data in a format of HTTP or HTTPS as a second protocol. The vehicle data is directed to diagnosis of the vehicle. The communicator transmits the vehicle data protocol-converted by the converter, to a communication terminal that is able to execute, by communication based on the second protocol, a vehicle diagnosis program held by a web server. The converter makes a protocol conversion of data transmitted from the communication terminal by the communication based on the second protocol, into data in a first protocol format. The communicator transmits, to the vehicle by the communication based on the first protocol, the data in the first protocol format that is protocol-converted by the converter.

Abstract: An orthogonal axis gear, a planetary gear reduction mechanism portion, and a differential gear mechanism portion are arranged along an axial center direction of left and right output shafts. The planetary gear reduction mechanism portion is constituted such that a sun gear thereof is provided as a continuation of a crown gear of the orthogonal axis gear, a ring gear thereof is fixed to a differential case, and a planetary carrier thereof serves as an output. Further, the differential gear mechanism portion employs a planetary gear mechanism and is constituted such that a ring gear of the planetary gear mechanism is provided as a continuation of the planetary carrier of the planetary gear reduction mechanism portion, a planetary carrier thereof is provided as a continuation of the left side output shaft, and a sun gear thereof is provided as a continuation of the right side output shaft.

Abstract: A final reduction gear device including an orthogonal axis gear and a speed reduction mechanism portion employing a planetary gear is provided. A radial bearing, more specifically a cylindrical roller bearing, having a large radial load capacity is disposed between a bevel ring gear of the orthogonal axis gear and a differential case. A thrust bearing, more specifically a thrust ball bearing or a thrust roller bearing, having a large axial load capacity is disposed between an axial end portion of a sun gear, and an inner race side of the radial bearing and the side of a fitting portion of the differential case, to which the inner race is fitted. A thrust bearing, more specifically a thrust ball bearing or a thrust roller bearing, having a large axial load capacity is disposed between the bevel ring gear and a planetary carrier of the speed reduction mechanism portion.

Abstract: A final reduction gear device including an orthogonal axis gear and a speed reduction mechanism portion employing a planetary gear is provided. A radial bearing, more specifically a cylindrical roller bearing, having a large radial load capacity is disposed between a bevel ring gear of the orthogonal axis gear and a differential case. A thrust bearing, more specifically a thrust ball bearing or a thrust roller bearing, having a large axial load capacity is disposed between an axial end portion of a sun gear, and an inner race side of the radial bearing and the side of a fitting portion of the differential case, to which the inner race is fitted. A thrust bearing, more specifically a thrust ball bearing or a thrust roller bearing, having a large axial load capacity is disposed between the bevel ring gear and a planetary carrier of the speed reduction mechanism portion.

Abstract: An orthogonal axis gear, a planetary gear reduction mechanism portion, and a differential gear mechanism portion are arranged along an axial center direction of left and right output shafts. The planetary gear reduction mechanism portion is constituted such that a sun gear thereof is provided as a continuation of a crown gear of the orthogonal axis gear, a ring gear thereof is fixed to a differential case, and a planetary carrier thereof serves as an output. Further, the differential gear mechanism portion employs a planetary gear mechanism and is constituted such that a ring gear of the planetary gear mechanism is provided as a continuation of the planetary carrier of the planetary gear reduction mechanism portion, a planetary carrier thereof is provided as a continuation of the left side output shaft, and a sun gear thereof is provided as a continuation of the right side output shaft.

Abstract: A power transfer system for four-wheel drive vehicles is provided which allows the power transmission system to be compact and the front differential to be located near the lateral center of the vehicle body even when an unmodified FR vehicle transmission is used. The amount of offset by which a pinion shaft of the front differential is offset from the lateral center of the vehicle body toward a drive pinion shaft is defined such that right and left drive shafts coupled to the front differential can be considered generally equal in length to each other. Furthermore, a differential case near the pinion shaft is extended toward the drive pinion shaft where the outer diameter thereof is maintained, and a hypoid drive gear is attached to the extended portion.

Abstract: A central differential has first and second output members for distributing power of an engine through a transmission to front and rear wheels respectively, and has a third output member for controlling distribution of the power. A first friction clutch is operatively connected to the second and third output members for restricting differential operation of the central differential and for controlling distribution of the power to the front and rear wheels. A second friction clutch is operatively connected to the second output member and either of the front or rear wheels. The first friction clutch is disposed at the innermost position and the second friction clutch is disposed around the first friction clutch so as to effectively transmit and distribute power to each wheel in compact and simple structure.