Method of manufacturing a transmission
AssigneeBorg-Warner Corporation
InventorMerle Dalton Coy
Life of this patent
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Abstract
A method of manufacturing a manual transmission wherein a one-piece, live countershaft having three bearing journals is used as an alignment reference to position the housing sections supporting the third mating bearing, so that the three bearings will be in alignment with no preloads. The reverse idler shaft is used as the other alignment reference.
Claims4
A method of assembling a transmission having a case supporting first mainshaft and countershaft bearings, a center support supporting second mainshaft and countershaft bearings, and an extension housing supporting a third countershaft bearing and defining a bore, the method comprising the steps of mounting a mainshaft assembly on the center support with its mainshaft journalled in the second mainshaft bearing, mounting a cluster gear assembly having a one-piece countershaft on the center support with its countershaft journalled in the second countershaft bearing, mounting a reverse idler gear assembly on the center support with its reverse idler gear shaft press fit in the center support, slipping the case over the mainshaft and cluster gear assemblies to abut one side of the center support with the input shaft of the mainshaft assembly and the countershaft journalled respectively in the first mainshaft and countershaft bearings, slipping the extension housing over the mainshaft, countershaft, and reverse idler gear assemblies to abut the other side of the center support with the countershaft journalled in the third countershaft bearing and the reverse idler gear shaft slip fit in the bore, adjusting the extension housing relative to the center support to eliminate preloads on the bearings, and securing the case, center support and extension housing together.
A method of assembling a transmission having a case supporting a front countershaft bearing, a center support supporting a center countershaft bearing, and an extension housing supporting a rear countershaft bearing, the method comprising the steps of mounting the mainshaft, cluster gear and reverse idler gear assemblies in the center support with a one-piece countershaft journalled in the center bearing, mounting the case over the mainshaft and cluster gear assemblies with the countershaft journalled in the front bearing in alignment with the center bearing, mounting the extension housing over the mainshaft, cluster gear and reverse idler gear assemblies with the countershaft journalled in the rear bearing and the reverse idler gear shaft loosely supported by the extension housing, positioning the extension housing relative to the countershaft and reverse idler gear shaft to align the rear bearing with the front and center bearings, and securing the case, center support and extension housing together.
A method of assembling a device having a first housing section supporting first and second bearings therein, a second housing section supporting a third bearing therein, a live shaft defining a first gear, and a dead shaft having a second gear journalled thereon, the method comprising journalling the live shaft in the first and second bearings, fixedly securing the dead shaft to said first housing section, placing the second housing section over the shafts such that the live shaft is journalled in the third bearing and the dead shaft is loosely supported by the second housing section with the gears in mesh, adjusting the second housing section relative to the first housing section such that the third bearing is in alignment with the first and second bearings to reduce preloads thereon, and securing the housing sections together.
Dependencies are inferred from the claim text.