US 5,199,317 A · Forward and reverse power shift transmission

Abstract

A forward and reverse power shift transmission (10) with an enclosed gear se (38) and a torque converter housing (44) is adapted to be connected to an engine bell housing (12). An input shaft (46), a lay shaft (146) an output shaft 36 and a pump driveshaft (280) are rotatably journaled in the gear case. A clutch cylinder and gear (78) secured to the input shaft is in mesh with a clutch cylinder and gear (178) secured to the lay shaft 146. A clutch gear (100) rotatably mounted on the input shaft (46) and a clutch gear (200) rotatably mounted on the lay shaft (146) are both in mesh with an output gear 240 on the output shaft 36 and in the front portion of the gear case (38). A pump drive gear (248) is journaled on the input shaft (46) and is adapted to be driven by the torque converter housing (262). The pump drive gear (248) is in mesh with a driven pump gear (290) on the pump drive shaft. The pump drive shaft (280) drives a lubrication pump (291) and is also a power take off. The input shaft (46) and the lay shaft (146) carry multiple disk clutches that lock the clutch gears (100 or 200) to the input or lay shafts when engaged. Switches (484) provide a warning when the clutch disk assemblies (112 or 212) and the clutch dics (114 or 214) are worn. A catch basin (334) on the outside of the gear case (38) catches any lubricant that is released while removing the external filter (326). A brake and assembly (336) encircles the output shaft 36; inside the gear case and brakes the output shaft when engaged.

Claims23

Dependent claims

A forward and reverse power shift transmission including a gear case, an input shaft rotatably journalled in the grear case, for rotation about an input shaft axis, a gear fixed to the input shaft, a clutch gear rotatably journalled on the input shaft forward of the gear fixed to the input shaft and a clutch pack carried by the input shaft and operable to lock the clutch gear to the input shaft when engaged;

a lay shaft rotatably journalled in the gear case for rotation about a lay shaft axis that is parallel to and spaced from the input shaft axis, a gear fixed to the lay shaft and in mesh with the gear fixed to the input shaft, a lay clutch gear rotatably journalled on the lay shaft forward of the gear fixed to the lay shaft and a clutch pack carried by the lay shaft and operable to lock the lay clutch gear to the lay shaft when engaged;
an output shaft rotatably journalled in the gear case for rotation about an output shaft axis, an output gear secured to the output shaft and in mesh with the clutch gear on the input shaft and the lay clutch gear on the lay shaft;
a pump drive gear rotatably journalled in the transmission for rotation about the input shaft axis, a pump drive shaft rotatably journalled in the gear case, and a driven pump gear secured to the pump drive shaft and in mesh with the pump drive gear;
and a lubricant pump driven by the pump drive shaft and operable to supply lubricant to lubricate the transmission.

1 more element

A forward and reverse power shift transmission including a gear case, an input shaft rotatably journalled in the gear case, for rotation about an input shaft axis, a gear fixed to the input shaft, a clutch gear rotatably journalled on the input shaft forward of the gear fixed to the input shaft and a clutch pack carried by the input shaft and operable to lock the clutch gear to the input shaft when engaged;

a lay shaft rotatably journalled in the gear case for rotation about a lay shaft axis that is parallel to and spaced from the input shaft axis, a gear fixed to the lay shaft and in mesh with the gear fixed to the input shaft, a lay clutch gear rotatably journalled on the lay shaft forward of the gear fixed to the lay shaft and a clutch pack carried by the lay shaft and operable to lock the lay clutch gear to the lay shaft when engaged;
an output shaft rotatably journalled in the gear case for rotation about an output shaft axis, an output gear secured to the output shaft and in mesh with the clutch gear on the input shaft and the lay clutch gear on the lay shaft;
a pump drive gear rotatably journalled in the transmission for rotation about the input shaft axis, a pump drive shaft rotatably journalled in the gear case, and a driven pump gear secured to the pump drive shaft and in mesh with the pump drive gear;
a lubricant pump driven by the pump drive shaft and operable to supply lubricant to lubricate the transmission;
an opening in the gear case adjacent to the pump drive shaft and a torque transmission connector integral with the pump drive shaft for driving an accessory outside the gear case;
a cylindrical surface on the output shaft, a band wrapped completely around the cylindrical surface, a yoke member attached to both ends of the band and an eccentric cam rotatably journaled in the gear case and in engagement with the yoke member and operable to move the yoke member away from the cylindrical surface to tighten the band and hold the output shaft from turning and operable to move the yoke member toward the cylinder surface to loosen the band and allow the output shaft to rotate;
a sensor associated with one of the clutch packs which is activated when the clutch has worn a predetermined amount;
a lubrication system with passages for conveying lubricant from the lubricant pump to the input shaft and the lay shaft and wherein the lubrication system includes a lubricant filter mounted on an outside surface of the gear case and a catch basin integral with the outside of the gear case and below the lubricant filter operable to catch oil that is released when the lubricant filter is removed.

5 more elements

Dependencies are inferred from the claim text.

Forward and reverse power shift transmission

Life of this patent

Forward and reverse power shift transmission

Life of this patent

Abstract

Claims23