A vehicle speed change arrangement that can perform automatic speed change using a manual transmission, including shift blocks such that a shift block of a reverse-1st speed, a shift block of 4th speed-5th speed, a shift block of 2nd speed-3rd speed, and a shift block of 6th speed are arranged in this sequence in a select operation direction. The arrangement also includes first to fourth shift levers for shifting the shift blocks, select actuators for selecting the first to fourth shift levers, a first shift actuator for shifting the first or second shift lever, a second shift actuator for shifting the third or fourth shift lever, a gear disengagement determination unit for determining whether a gear is disengaged when the gear engagement or disengagement is made using the first and second shift actuators, and a drive unit for driving the gear engaging shift actuator when gear disengagement is determined.

Proposed is a transmission of a working vehicle. The transmission of a working vehicle includes an ultra-low speed gearbox having an ultra-low speed shift rod which moves axially and an ultra-low speed shift fork coupled to the ultra-low speed shift rod, a sub-gearbox which operates by receiving power shifted from the ultra-low speed gearbox and has two sub-shift rods and two sub-shift forks, and a stopper which is disposed between the ultra-low speed gearbox and the sub-gearbox and limits an ultra-low speed shift stage engagement of the ultra-low speed gearbox when the sub-gearbox is engaged in a specific stage (a sub-shift highest stage), thereby preventing damage or breakage to parts of an associated transmission due to the rapid rotation of the sub-gearbox during an ultra-low speed and high load operation.

An actuator device for a gearbox of a motor vehicle includes a plurality of selector shafts displaceable in a first direction between a plurality of selection positions and in a second direction between a plurality of shifting positions and which each have a connecting element that is operatively-connected in at least one of the selection positions with at least one selector rail of the gearbox for transferring a movement of the selector shaft in the second direction onto the selector rail. The selector shafts are mounted relative to each other to be movable relative to one another in the first direction and are fixed to relative to each other in the section direction The selection positions of the selector shafts are independently adjustable by of a plurality of first adjusting elements and wherein the selector shafts can be displaced together between the shifting positions by means of a second adjusting element.

In order to achieve a simple and miniaturized structure, there is provided an interlock mechanism including a shaft disposed to be movable in an axial direction and rotatable in a rotation direction, an interlock member disposed coaxially with an outer peripheral side of the shaft so as to be rotatable integrally with the shaft in the rotation direction and immovable in the axial direction, and configured to include a first main body portion, a second main body portion, and a connection pin, a first fork from which a fork head protrudes, and a second fork from which a fork head protrudes. A first engagement target portion engaging with the fork head is cut out in the first main body portion of the interlock member. A second engagement target portion engaging with the fork head is cut out in the second main body portion of the interlock member.

A gear-shifting device for a vehicle is provided and includes a guide body that has a first end portion connected to a control shaft, installed so that a second end portion is rotated at the first end portion as an axis in a rotational displacement that corresponds to a selecting path to perform a selecting operation, and installed to be moved in a substantially straight displacement that corresponds to a shifting path along an axis direction of the first end portion to perform a shifting operation. A guide unit is disposed to distinguish each shifting path on the selecting path in which the second end portion of the guide body is rotated and is configured to guide the second end portion of the guide body to be movable along the shifting path.

Proposed is a transmission of a working vehicle. The transmission of a working vehicle includes an ultra-low speed gearbox having an ultra-low speed shift rod which moves axially and an ultra-low speed shift fork coupled to the ultra-low speed shift rod, a sub-gearbox which operates by receiving power shifted from the ultra-low speed gearbox and has two sub-shift rods and two sub-shift forks, and a stopper which is disposed between the ultra-low speed gearbox and the sub-gearbox and limits an ultra-low speed shift stage engagement of the ultra-low speed gearbox when the sub-gearbox is engaged in a specific stage (a sub-shift highest stage), thereby preventing damage or breakage to parts of an associated transmission due to the rapid rotation of the sub-gearbox during an ultra-low speed and high load operation.

A shifting apparatus for a manual transmission able to shift two shift stages, of which selection positions are different but shift positions are the same, using a single fork and a single sleeve. Compared to the related art in which a fork and a synchronization sleeve are provided to each of two independent shift stages, the full length of the transmission is reduced, thereby reducing the weight and manufacturing costs.

A manual transmission includes: a shift selection shaft (20); a shift inner lever (32) including an arm portion (32b) provided on an outer side of a tubular portion (32a) so as to project outwardly in a radial direction; an interlock plate (34) including a projection (34b) provided on an outer side of a boss portion (34a) so as to project outwardly in the radial direction; and a reverse shift arm (41) supported by a transmission case (C) via a bracket (42) in a pivoting manner. The bracket is provided with a regulation portion (46) for regulating inclination of the interlock plate at the time of a shift operation.

A gear-shifting device for a vehicle is provided and includes a guide body that has a first end portion connected to a control shaft, installed so that a second end portion is rotated at the first end portion as an axis in a rotational displacement that corresponds to a selecting path to perform a selecting operation, and installed to be moved in a substantially straight displacement that corresponds to a shifting path along an axis direction of the first end portion to perform a shifting operation. A guide unit is disposed to distinguish each shifting path on the selecting path in which the second end portion of the guide body is rotated and is configured to guide the second end portion of the guide body to be movable along the shifting path.

An interlock mechanism includes a shift-and-select shaft a first fork, a second fork, a first inner lever, a second inner lever, an interlock member coaxially arranged around an outer circumference of the shift-and-select shaft while being allowed to rotate together with the shift-and-select shaft in the rotation direction as a unit and not allowed to be displaced in the axial direction, a first engagement portion formed on the first fork, a second engagement portion formed to project from the second fork, a first engaged portion formed to project from the inter lock member and engaged with the first engagement portion while the interlock member is positioned at a second rotation position and a second engaged portion formed on the interlock member and engaged with the second engagement portion while the interlock member is positioned at a first rotation position.