초록 ▼

A multiple countershaft transmission including a housing containing at least two countershafts having parallel axes of rotation and being fixed against all movement except rotative with respect to the housing. The housing mounts an input shaft and a mainshaft having a common axis of rotation. The in

A multiple countershaft transmission including a housing containing at least two countershafts having parallel axes of rotation and being fixed against all movement except rotative with respect to the housing. The housing mounts an input shaft and a mainshaft having a common axis of rotation. The input shaft is free to rotate relative to the mainshaft. The input shaft and mainshaft are fixed against all movement except rotative with respect to the housing. The input shaft mounts an input gear for rotative movement therewith. The mainshaft extends through and mounts a plurality of mainshaft gears which are free to rotate with respect to the mainshaft. The rotational axes of the countershafts are parallel to, equidistant from, and preferably symmetrically spaced about the common input shaft, mainshaft rotational axis. Each mainshaft gear and the input gear meshes with an axially aligned gear on each countershaft. The gear tooth count within each set of axially aligned countershaft gears is identical. The mainshaft is selectively clutchable to the mainshaft gears and the input gear one at a time for rotative movement therewith. An appropriate level of spline lash is used to accommodate inevitable gear timing variations in the assembled transmission due to part manufacturing tolerances without gear tooth mesh interference. The input countershaft gears are coupled to the remainder of the countershaft assemblies by torsionally resilient shafts to ensure substantially balanced distribution of torque on each countershaft as each countershaft assembly drives a clutched mainshaft gear. Adjustment is provided to rotationally index the input countershaft gears to the remainder of the countershaft assemblies. Synchromesh clutches can be employed to facilitate smooth gear engagement.

대표청구항 ▼

[ What is claimed is:] [1.] A change-gear system comprising:(a) a housing;(b) at least two spaced countershafts having parallel axes and mounted for rotation within said housing, said countershafts each having a fixed axis of rotation with respect to said housing;(c) a plurality of groups of gears o

[ What is claimed is:] [1.] A change-gear system comprising:(a) a housing;(b) at least two spaced countershafts having parallel axes and mounted for rotation within said housing, said countershafts each having a fixed axis of rotation with respect to said housing;(c) a plurality of groups of gears on said countershafts, each group being comprised of countershaft gears of identical gear tooth count;(d) rotationally interlocked means for providing input power for each of said countershafts;(e) torsionally resilient means to transmit rotational energy from said rotationally interlocked means to each of said countershafts;(f) a driven gear driveable from each group of said countershaft gears;(g) output means having a fixed axis of rotation with respect to said housing;(h) each said driven gear rotatably mounted on said output means;(i) gear tooth backlash being provided within assembled said change-gear system;(j) means for selectively clutching said output means to one of said driven gears at a time for selectively establishing a driving relationship from said countershafts through one group of said countershaft gears at a time, thence to and through said driven gear driveable from said one group for effecting driving of said output means.