Drive mechanism for a scroll type fluid displacement apparatus
AssigneeSanden Corporation
InventorMasaharu Hiraga
Life of this patent
Estimating the term…
Abstract
A scroll type fluid displacement apparatus is disclosed. The apparatus includes a housing having a front end plate and a scroll housing. A fixed wrap extends into an operative interior area of the housing from an inner end surface of an end plate portion of the scroll housing. An orbiting scroll member has an end plate from which an orbiting wrap extends, and a tubular member axially projecting from the end surface of end plate into the operative interior area of the housing. The tubular member has a hollow interior. A drive shaft is rotatably supported by the front end plate and a crank pin extends from its inner end surface. The crank pin is rotatably carried within the hollow interior of the tubular member through a bearing assembly to thereby rotatably support the orbiting scroll.
Claims17
A scroll type fluid displacement apparatus comprising:
- a housing having a fluid inlet port and fluid outlet port;
- a fixed scroll joined with said housing and having a first end plate from which a first wrap extends into an operative interior area of said housing;
- an orbiting scroll having second end plate from which a second wrap extends, and a tubular member axially projecting from a generally central radial area of said second end plate into said operative interior area to at least adjacent the axial center of said first wrap, said first and second wraps interfitting at an angular and radial offset to make a plurality of line contacts to define at least one pair of fluid pockets;
- rotation preventing means disposed in said housing for preventing the rotation of said orbiting scroll;
- a driving mechanism including a drive shaft rotatably supported by said housing to drive said orbiting scroll in an orbital motion to thereby change the volume of said fluid pockets;
- a crank pin axially projecting from an inner end of said drive shaft at a location radially offset from the center of said drive shaft, and said crank pin being rotatably carried in a hollow interior of said tubular member through a bearing assembly, at least a portion of said bearing assembly being carried in a recess in said hollow interior;
- and
- a snap ring attached to a distal end of said crank pin, and a spring washer placed between and in contact with said snap ring and said at least a portion of said bearing assembly.
In a scroll type fluid displacement apparatus including a housing having an inlet port and an outlet port, a fixed scroll joined with said housing and having first end plate from which a first wrap extends into an operative interior area of said housing, an orbiting scroll having a second end plate from which a second wrap extends, said first and second wraps interfitting at an angular and radial offset to make a plurality of line contacts to define at least one pair of fluid pockets within said operative interior area, a driving mechanism connected to said orbiting scroll to drive said orbiting scroll in an orbital motion, and rotation preventing means for preventing the rotation of said orbiting scroll so that the volume of the fluid pockets changes during the orbital motion of said orbiting scroll, said driving mechanism including a drive shaft rotatably supported by said housing and a crank pin axially projecting from an inner end of said drive shaft, said orbiting scroll including a tubular member projecting axially from said second end plate and extending axially into said operative interior area a distance so that its distal end is located at least adjacent the axial center of said first wrap, said tubular member having a hollow interior, and said crank pin extending through and being rotatably carried in said hollow interior by a bearing assembly, said bearing assembly including a first bearing adjacent the distal end of said tubular member, said first bearing being carried in a recess in said hollow interior of said tubular member, a snap ring being attached to a distal end of said crank pin, and a spring washer being placed between and in contact with said snap ring and said first bearing.
Dependencies are inferred from the claim text.