Change speed transmission in range-type design for motor vehicles

Claim 2

Change-speed transmission for motor vehicles, in particular for use in agricultural and industrial types of tractors having an engine, a gear-shift transmission unit, an intermediate drive transmission unit, and a range-shift transmission unit having at least two forward speed ranges and one reverse speed, characterized by: the intermediate drive unit having a planetary drive arrangement whereby the planetary gear ring is driven externally by means selectively connectable to a power source, and the sun gear of the planetary drive is connected to a first countershaft forming a part of the gear-shift transmission unit and is driven thereby, and the planetary gear carrier of the planetary drive is connected to and drives a second countershaft forming a part of the range-shift transmission unit; and, the selectively connectable means comprising a sliding tubular gear means sleeved over a power output shaft of the range-shift transmission unit, and an external gear ring portion around the circumference of the planetary gear ring, the gear means and the output shaft each having mating splined portions in one axial moved position of the gear means along the output shaft and the gear means meshing with the gear ring portion in the one axial position for transferring power from the range-shift transmission to the planetary gear ring in a selected one of the two forward speed ranges.

Claim 3

Change-speed transmission according to claim 1, further characterized by: a splined portion on a power shaft of the change speed transmission unit mating with the splined portion of the gear means in a second axial moved position of the gear means along the output shaft and the gear means meshing with the gear ring portion, a non-splined portion in the gear means disengaging the gear means from the splined portion of the output shaft in the second axial position for transferring power from the change-speed transmission unit to the planetary gear ring at the speed of the power shaft.

Claim 4

Change-speed transmission according to claim 2, further characterized by: the gear means having a third axial moved position along the output shaft into a neutral position unmeshing the gear means from the gear ring portion.

Claim 5

Change-speed transmission according to claim 3, further characterized by: a brake band means adjacent the gear ring portion on the planetary gear ring for braking the planetary gear ring in the third axial position of the gear means for transferring power from the change-speed transmission unit to the range-shift transmission unit at a differential speed between the speed of the sun gear and the speed of the planetary carrier.

Claim 6

Change-speed transmission according to claim 3, further characterized by: a dog clutch means between the second countershaft and the planetary gear ring connecting the planetary gear ring in the third axial position of the gear means to the second countershaft for directly transferring power from the change-speed transmission unit to the range-shift transmission unit at a selected speed ratio of the change-speed transmission unit.

Claim 7

Change-speed transmission according to claim 3, further characterized by: an auxiliary power shaft geared for driving to the engine, and the selectively connectable means further includes a ratchet gear wheel mounted on the auxiliary power shaft, and drive means connecting the ratchet gear wheel to the gear portion in the third axial moved position of the gear means for transferring power from the engine to the planetary gear ring at the speed of the auxiliary power shaft.

Claim 8

Change-speed transmission for motor vehicles, in particular for use in agricultural and industrial types of tractors having an engine, a gear-shift transmission unit, an intermediate drive transmission unit, and a range-shift transmission unit having at least two forward speed ranges and one reverse speed, characterized by: the intermediate drive unit having a planetary drive arrangement whereby the planetary gear ring is driven externally by means selectively connectable to a power source, and the sun gear of the planetary drive is connected to a first countershaft forming a part of the gear-shift transmission unit and is driven thereby, and the planetary gear carrier of the planetary drive is connected to and drives a second countershaft forming a part of the range-shift transmission unit; and, the selectively connectable means comprising a sliding tubular gear means sleeved over a power output shaft of the range-shift transmission unit, an external gear portion around the circumference of the planetary gear ring, and a splined portion on a power shaft of the change-speed transmission unit mating with a splined portion in the gear means in an axial moved position of the gear means along the output shaft and the gear means meshing with the gear portion in the axial moved position for transferring power from the change-speed transmission unit to the planetary gear ring at the speed of the power shaft.

Claim 9

Change-speed transmission for motor vehicles, in particular for use in agricultural and industrial types of tractors having an engine, a gear-shift transmission unit, an intermediate drive transmission unit, and a range-shift transmission unit having at least two forward speed ranges and one reverse speed, characterized by: the intermediate drive unit having a planetary drive arrangement whereby the planetary gear ring is driven externally by means selectively connectable to a power source, and the sun gear of the planetary drive is connected to a first countershaft forming a part of the gear-shift transmission unit and is driven thereby, and the planetary gear carrier of the planetary drive is connected to and drives a second countershaft forming a part of the range-shift transmission unit; and, the selectively connectable means comprising a sliding tubular gear means sleeved over a power output shaft of the range-shift transmission unit, an external gear portion around the circumference of the planetary gear ring, and a splined portion on a power shaft of the change-speed transmission unit mating with a splined portion in the gear means in an axial moved position of the gear means along the output shaft and the gear means meshing with the gear portion in the axial moved position for transferring power from the change-speed transmission unit to the planetary gear ring at the speed of the power shaft.