Transmission equipped with planetary gear mechanism and planetary gear mechanism

A planetary gear mechanism to be built into a transmission, comprising:

• that first element of a planetary gear mechanism which is made up of a sun gear;
• that second element of said planetary gear mechanism which is made up of one of a ring gear and a carrier,
• said first element and said second element being coupled respectively to a first power transmission member which is disposed on one axial side of said planetary gear mechanism and to a second power transmission member which is disposed on an axially opposite side of said planetary gear mechanism,
• wherein said second element has formed therein a cylindrical portion which is inserted into an inner circumference of said first element with a diametrical clearance therebetween;
• wherein said first element is axially positioned relative to said cylindrical portion through an annular projection which is formed on an inner circumference of said first member, and
• wherein said first element is coupled to said first power transmission member with an axial play.

A planetary gear mechanism to be built into a transmission in which a cylindrical power transmission member which is disposed on one axial side of a planetary gear mechanism is coupled to that carrier of said planetary gear mechanism which rotatably supports a planetary pinion through a pinion shaft, said planetary gear mechanism comprising:

• a supporting portion which is formed in a side plate portion on one axial side of said carrier, said supporting portion being fitted into said power transmission member;
• a first engaging portion which is made up of one of a non-circular projection and recess formed in an end surface of said pinion shaft which protrudes through a shaft hole formed in said side plate;
• and
• a second engaging portion which is made up of one of a non-circular recess and projection formed in that end surface of said power transmission member which is on a side of said side plate portion, said second engaging portion being engaged with said first engaging portion when said pinion shaft is in a predetermined phase.