Transmission extension oil seal

Claim 2

A combined shipping seal and drive shaft yoke seal assembly for a transmission having a main housing and an extension housing, an output shaft located in the extension housing, a seal surrounding the output shaft, the output shaft extending through a circular opening in the extension housing, said seal being arranged in sealing engagement with the surface of the shaft and having at least one circular seal lip thereon, the margin of said seal lip engaging the inner surface of said opening in the extension housing whereby fluid within the main transmission housing is sealed within the main housing thus preventing leakage of fluid through the extension housing opening, said output shaft having an external spline portion, a slip yoke forming a part of the universal joint and having an internally splined opening, the slip yoke being adapted to be inserted within the opening with its spline teeth and registering with the external splines of the output shaft, the innermost end of the yoke being adapted to engage the seal lip of said seal thereby pushing said seal lip away from engagement with the wall of said opening and effecting sealing contact with the interior of the yoke.

Claim 3

A combined shipping seal and drive shaft yoke seal assembly for a transmission having a main housing and an extension housing, an output shaft located in the extension housing, an inner seal surrounding the output shaft, the output shaft extending through a circular opening in the extension housing, said inner seal being arranged in sealing engagement with the surface of the shaft and having at least one circular seal lip thereon, the margin of said seal lip engaging the inner surface of said opening in the extension housing, whereby fluid within the main transmission housing is sealed within the main housing thus preventing leakage of fluid through the extension housing opening, said output shaft having an external spline portion, a slip yoke forming a part of the universal joint and having an internally splined opening, the slip yoke being adapted to be inserted within the opening with its spline teeth and registering with the external splines of the output shaft, the innermost end of the yoke being adapted to engage the seal lip of said inner seal thereby pushing said seal lip away from enagement with the wall of said opening and effecting sealing contact with the interior of the yoke, a second annular seal located near the outermost end of the extension housing in sealing engagement with the outer surface of said yoke thereby preventing leakage of fluid from the main housing, said inner seal maintaining an effective separation of the fluid within the housing from lubricant in the region of the engaged spline teeth of the output shaft in the yoke.

Claim 4

A combined shipping seal and drive shaft yoke seal assembly for a transmission having a main housing and an extension housing, an output shaft located in the extension housing, an inner seal surrounding the output shaft, the output shaft extending through a circular opening in the extension housing, said inner seal being arranged in sealing engagement with the surface of the shaft and having at least one circular seal lip thereon, the margin of said seal lip engaging the inner surface of said opening in the extension housing, whereby fluid within the main transmission housing is sealed within the main housing thus preventing leakage of fluid through the extension housing opening, said output shaft having an external spline portion, a slip yoke forming a part of the universal joint and having an internally splined opening, the slip yoke being adapted to be inserted within the opening with its spline teeth and registering with the external splines of the output shaft, the innermost end of the yoke being adapted to engage the seal lip of said inner seal thereby pushing said seal lip away from enagement with the wall of said opening and effecting sealing contact with the interior of the yoke, a second annular seal located near the outermost end of the extension housing in sealing engagement with the outer surface of said yoke thereby preventing leakage of fluid from the main housing, said inner seal maintaining an effective separation of the fluid within the housing from lubricant in the region of the engaged spline teeth of the output shaft in the yoke.

Claim 5

The combination as set forth in claim 1 wherein the transmission includes a bearing located inside the extension housing opening surrounding said output shaft and adapted to support said output shaft within said extension housing to accommodate radial loads on the output shaft.

Claim 6

The combination as set forth in claim 2 wherein the transmission includes a bearing located inside the extension housing opening surrounding said output shaft and adapted to support said output shaft within said extension housing to accommodate radial loads on the output shaft.

Claim 7

The combination as set forth in claim 1 wherein said seal comprises a series of real lips adapted to engage the inner surface of the opening in the extension housing, said seal lips being arranged in close proximity and adapted to be displaced by said yoke away from said inner surface when the latter is assembled over the output shaft.

Claim 8

The combination as set forth in claim 2 wherein said inner seal comprises a series of real lips adapted to engage the inner surface of the opening in the extension housing, said seal lips being arranged in close proximity and adapted to be displaced by said yoke away from said inner surface when the latter is assembled over the output shaft.