A sleeve in the shift control device includes a sleeve main body and a first convex section. The first convex section is annular in shape and protruded radially outward from the outer circumferential surface of the sleeve main body. The shift fork includes a fork main body, a second convex section, a ring, and a joining member. The fork main body is annular in shape and disposed radially outside the sleeve main body. The second convex section is annular in shape, axially disposed side by side with the first convex section, and protruded radially inward from the inner circumferential surface of the fork main body. The first convex section is axially sandwiched between the ring and the second convex section. The joining member is disposed in a space that is formed by a first groove formed in the ring and a second groove formed in the fork main body.

A sleeve in the shift control device includes a sleeve main body and a first convex section. The first convex section is annular in shape and protruded radially outward from the outer circumferential surface of the sleeve main body. The shift fork includes a fork main body, a second convex section, a ring, and a joining member. The fork main body is annular in shape and disposed radially outside the sleeve main body. The second convex section is annular in shape, axially disposed side by side with the first convex section, and protruded radially inward from the inner circumferential surface of the fork main body. The first convex section is axially sandwiched between the ring and the second convex section. The joining member is disposed in a space that is formed by a first groove formed in the ring and a second groove formed in the fork main body.

A shifting mechanism in which an inclination of a sleeve with respect to a shift fork is reduced while maintaining a clearance between the shift fork and the sleeve. In the shifting mechanism, an engagement groove is formed entirely around a shift sleeve, and a cutout is formed on the engagement groove. A first diameter of the shift sleeve between predetermined sites of the bottom of the engagement groove within the cutouts is shorter than a second diameter of the shift sleeve between predetermined sites of the bottom of the engagement groove. A straight-line distance between the engagement ridges formed on both ends of the shift fork is longer than the first diameter but shorter than the second diameter.

A transmission includes a shifting fork. The transmission has a first gear state and a second gear state being selectable by means of the shifting fork. The shifting fork is displaceable in an axial direction between a first predetermined position and a second predetermined position. The first gear state is provided when the shifting fork is placed in the first predetermined position and the second gear state is provided when the shifting fork is placed in the second predetermined position. The first predetermined position and the second predetermined position are arranged one after the other without any further predetermined position providing a further selectable gear state arranged between the first predetermined position and the second predetermined position. The first gear state provides a first gear of the transmission and the second gear state provides a second gear or a park lock state of the transmission.

A shifting mechanism in which an inclination of a sleeve with respect to a shift fork is reduced while maintaining a clearance between the shift fork and the sleeve. In the shifting mechanism, an engagement groove is formed entirely around a shift sleeve, and a cutout is formed on the engagement groove. A first diameter of the shift sleeve between predetermined sites of the bottom of the engagement groove within the cutouts is shorter than a second diameter of the shift sleeve between predetermined sites of the bottom of the engagement groove. A straight-line distance between the engagement ridges formed on both ends of the shift fork is longer than the first diameter but shorter than the second diameter.

The transmission includes a rotation shaft, a shift gear, and a gear switching part. The shift gear is rotatably supported by the rotation shaft. The gear switching part is relatively unrotatably supported by the rotation shaft in a movable manner in an axial direction. The gear switching part is configured to be moved in the axial direction by a shift fork, to switch connection and disconnection between the rotation shaft and the shift gear. The gear switching part and the shift fork have a bearing therebetween. The bearing is brought into contact with the gear switching part and the shift fork, thereby reducing friction between the gear switching part and the shift fork, resulting in improvement of durability of the sliding surfaces of the gear switching part and the shift fork.

Provided herein is a coating method for a vehicle shift fork and the methods includes: preparing a Fe—Cr—Mo-based composition such as a powder; pretreating the shift fork by washing a pad part of the shift fork to remove impurities; forming a coating layer on the pad part using the Fe—Cr—Mo-based powder by high velocity oxygen fuel spraying (HVOF) method; and cooling the coating layer at a rate of about 10.sup.6 to about 10.sup.8 K/s to form an amorphous coating layer. Further provided are an amorphous coating formed by high velocity oxygen fuel spraying (HVOF) method and a shift fork including the amorphous coating.

The present disclosure generally relates to an article used in the manual transmission gearbox in automobiles. More particularly, it relates to an article used in manual transmission gearbox, namely the shifter dog, composition used for manufacturing the shifter dog and a method of manufacturing the shifter dog.

The transmission includes a rotation shaft, a shift gear, and a gear switching part. The shift gear is rotatably supported by the rotation shaft. The gear switching part is relatively unrotatably supported by the rotation shaft in a movable manner in an axial direction. The gear switching part is configured to be moved in the axial direction by a shift fork, to switch connection and disconnection between the rotation shaft and the shift gear. The gear switching part and the shift fork have a bearing therebetween. The bearing is brought into contact with the gear switching part and the shift fork, thereby reducing friction between the gear switching part and the shift fork, resulting in improvement of durability of the sliding surfaces of the gear switching part and the shift fork.

A vehicle manual transmission includes: shift fork shafts; shift forks; sleeves; and gear pieces. Each of the shift forks is coupled with the shift fork shaft so as to be moved together. Each of the sleeves has an annular shape. The sleeve includes an annular sliding groove to be fitted to the shift fork on an outer peripheral surface of the sleeve. The sleeve includes peripheral edges forming annular planes as viewed in the longitudinal direction of the shift fork shaft. Each of the gear pieces includes outer peripheral teeth to be meshed with inner peripheral teeth formed on an inner peripheral surface of the sleeve when the sleeve is moved in accordance with the gear shift operation. The shift fork shaft or the shift fork includes a restricting member that abuts to the peripheral edge so as to restrict a movement of the sleeve in a longitudinal direction.