High efficiency, high output transmission
A transmission includes an input shaft coupled to a prime mover, a countershaft, main shaft, and an output shaft, with gears between the countershaft and the main shaft. A shift actuator selectively couples the input shaft to the main shaft by rotatably coupling gears between the countershaft and the main shaft. The shift actuator is mounted on an exterior wall of a housing including the countershaft and the main shaft. An integrated actuator housing is operationally coupled to the shift actuator and a linear clutch actuator. The linear clutch actuator is a self-adjusting actuator, and the transmission includes a self-adjusting clutch.
1. An automated truck transmission, comprising:
a transmission housing;
an input shaft configured to couple to a prime mover by a drive clutch and having a first plurality of gears coupleable thereto;
a countershaft disposed in the transmission housing and having a second plurality of gears mounted thereon;
a main shaft disposed in the transmission housing and having a third plurality of gears mounted thereon;
an output shaft selectively providing a torque output to a driveline; and
an integrated actuator assembly, the integrated actuator assembly including:
an integrated actuator housing supporting a shift actuator system structured to selectively couple the input shaft to the main shaft by rotatably coupling at least one of the first plurality of gears to the input shaft and by rotatably coupling at least one of the third plurality of gears to the main shaft, wherein the shift actuator system is mounted on an exterior wall of the transmission housing; and
the integrated actuator assembly further comprising a clutch actuator housing mounted directly to the integrated actuator housing, wherein a clutch actuator is positioned at least partially within the clutch actuator housing for activating the drive clutch, wherein the clutch actuator and the shift actuator system are powered by a common air supply connected to a single input port of the integrated actuator assembly.
2. The transmission of claim 1 , further comprising a diaphragm spring clutch.
3. The transmission of claim 1 , further comprising a friction brake configured to engage the countershaft, and wherein the friction brake is powered by the common air supply.
4. The transmission of claim 3 , wherein the transmission does not include any external pneumatic hoses.
5. The transmission of claim 1 , the wherein the clutch actuator is pneumatically activated, wherein the clutch actuator has a first extended position and a second retracted position, and wherein the clutch actuator includes a near zero dead air volume in the second retracted position.
6. The transmission of claim 1 , wherein the transmission housing is made from cast aluminum.
7. An automated truck transmission, comprising:
a transmission housing including a main housing portion and a rear housing portion mounted to the main housing portion;
an input shaft configured to couple to a prime mover and having a first plurality of gears coupleable thereto;
a pair of countershafts having a second plurality of gears mounted thereon;
a main shaft having a third plurality of gears mounted thereon;
an output shaft selectively providing a torque output to a driveline, the output shaft extending through a driveline opening in the rear housing portion coaxial with the input shaft;
a shift actuator system structured to selectively couple the input shaft to the main shaft by rotatably coupling at least one of the first plurality of gears to the input shaft and by rotatably coupling at least one of the third plurality of gears to the main shaft, wherein the shift actuator system is mounted on an exterior wall of the main housing portion of the transmission housing, and wherein the pair of countershafts and the main shaft are at least partially positioned within the transmission housing; and
further comprising a clutch actuator housing, wherein a clutch actuator is positioned at least partially within the clutch actuator housing; and
wherein the transmission housing is made from aluminum and includes a first 8-bolt power take-off (PTO) interface comprising a side access opening to one of the second plurality of gears mounted on one of the pair of countershafts, and a second PTO interface disposed in the rear housing portion laterally offset from the driveline opening for providing access to the other of the pair of countershafts.
8. The transmission of claim 7 , wherein the second plurality of gears mounted on the countershaft comprise helical gears.
9. The transmission of claim 8 , wherein the transmission further comprises a lubrication system having a lubrication pump assembly coupled to the countershaft and having a dry sump wherein rotating portions of the transmission are not positioned within lubricating fluid in the sump.
10. The transmission of claim 9 , wherein the transmission does not include a cooler.
11. An automated truck transmission, comprising:
a transmission housing including a main housing portion and a rear housing portion mounted to the main housing portion;
an input shaft configured to couple to a prime mover and disposed in the transmission housing;
a pair of countershafts having a first plurality of gears mounted thereon and disposed in the transmission housing;
a main shaft having a second plurality of gears mounted thereon and disposed in the transmission housing;
an output shaft selectively providing a torque output to a driveline and disposed in the transmission housing, the output shaft extending through a driveline opening in the rear housing portion coaxial with the input shaft; and
wherein the transmission housing is made from aluminum and includes a first 8-bolt power take-off (PTO) interface comprising a side access opening to one of the first plurality of gears mounted on one of the pair of countershafts, and a second PTO interface disposed in the rear housing portion laterally offset from the driveline opening for providing access to the other of the pair of countershafts.