Patent ID: 7296982

Claim:
An air supply device comprising: a compression mechanism section having a stationary scroll and an orbital scroll held in engagement with each other; a drive section for driving said compression mechanism section, said compression mechanism section and said drive section having a common shaft for causing said orbital scroll to undergo an orbiting motion with respect to said stationary scroll and thereby compress air sucked into said compression mechanism section; rotation constraint members for preventing rotation of said orbital scroll about its own axis, while allowing said orbital scroll to orbit relative to said stationary scroll; first grease-filled bearings for rotatably supporting said common shaft; second grease-filled bearings for rotatably supporting said orbital scroll, each of said second grease-filled bearings having (i) an outer ring, (ii) an inner ring, (iii) rolling elements interposed between said outer ring and said inner ring, and (iv) two sealing materials disposed on respective sides of said rolling elements, each of said two sealing materials having (a) an inner portion held in contact with said inner ring, said inner portion being been bent towards a low-pressure side from a high-pressure side, and (b) an outer end held in contact with said outer ring; and third grease-filled bearings for rotatably supporting each of said rotation constraint members.