Method for assembling a hybrid electro-mechanical transmission
View Patent ↗A hybrid transmission including two electric motors and a plurality of planetary gear sets operatively connectable to the motors and to an engine is provided. Novel motor features are provided including structure adapted to improve reliability and to facilitate assembly. More precisely, a method is provided for locating and installing the components of a motor, including a rotor and a stator, within a covered housing to form a motor module. A plurality of rotor bearings and a position/speed sensor are also preferably added to the motor module. After the motor module is assembled, the motor may be tested and thereafter the motor module can be installed into a hybrid transmission as a single component utilizing conventional transmission assembly methods.
1. A method for assembling a hybrid transmission, said hybrid transmission having a transmission housing, the method comprising:
assembling a motor module including:
inserting a motor assembly into a module housing;
axially locating the motor assembly relative to the module housing;
radially positioning the motor assembly relative to the module housing;
mounting a housing cover to the module housing;
testing the motor module; and
attaching the motor module to an inside portion of the transmission housing between a transmission input member and a transmission output member after the motor module has been assembled and tested.
2. The method of claim 1 wherein said inserting the motor assembly within the module housing includes interference fitting the motor assembly into the module housing.
3. The method of claim 2 , wherein said interference fitting the motor assembly into the module housing includes heating the module housing and cooling the motor assembly.
4. The method of claim 1 wherein said attaching the motor module to the transmission housing includes slip fining the motor module into the transmission housing.
5. The method of claim 1 wherein said mounting the housing cover to the module housing includes bolting the housing cover to the module housing.
6. The method of claim 1 wherein said assembling the motor module includes attaching a first rotor bearing to said module housing.
7. The method of claim 6 wherein said assembling the motor module further includes attaching a second rotor bearing to said module housing cover.
8. The method of claim 7 wherein said assembling the motor module includes attaching a spring washer between said second rotor bearing and said module housing cover.
9. The method of claim 8 wherein said assembling the motor module includes attaching a sensor to said module housing.
10. The method of claim 1 , wherein said radially positioning the motor assembly relative to the module housing includes engaging an internal spline of said module housing with a spline feature of said motor assembly.
11. The method of claim 1 , wherein said axially locating the motor assembly relative to the module housing includes butting the motor assembly against an internal locating shoulder of said module housing.