Scroll type compressor having curved surface portions between the shaft and bearing means
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsFumiaki Sano, Masahiko Oide, Toshiyuki Nakamura, Hiroshi Ogawa, Norihide Kobayashi, Yoshinori Shirafuji, Takashi Yamamoto, Keiji Sakaino
Life of this patent
Estimating the term…
Abstract
A scroll type compressor comprising: a crankshaft having an eccentric shaft portion formed thereon; an orbiting scroll which is given torque by the crankshaft through the eccentric shaft portion; and bearing means for rotatably supporting the crankshaft; wherein at least one of the eccentric shaft portion and the bearing means is constituted by a rotatably engaged bushing and a curved surface portion.
Claims6
A scroll type compressor comprising:
- a rotatable crankshaft having an eccentric shaft portion formed thereon;
- a fixed scroll;
- an orbiting scroll cooperable with said fixed scroll to compress gas;
- and
- bearing means rotatably connecting said orbiting scroll to said eccentric shaft portion so as to orbitally drive said orbiting scroll, wherein said bearing means comprises:
- a) a bushing having an outer periphery fitted in said orbiting scroll, and
- b) a non-rotatable connection between said bushing and said eccentric shaft portion, said non-rotatable connection including a portion curved in the direction of the axis of rotation of the crankshaft.
A scroll type compressor comprising:
- a main frame;
- a sub frame
- a crankshaft rotatably mounted in said main frame and said sub frame via bushings, said crankshaft having an eccentric shaft portion formed thereon, wherein the main frame and sub frame are mutually spaced along the axis of the crankshaft;
- a fixed scroll;
- an orbiting scroll cooperable with the fixed scroll to compress gas, said orbiting scroll being drivingly mounted on said eccentric shaft portion;
- a electric motor mounted between said main frame and said sub frame and having a rotor coupled to said crankshaft for driving said crankshaft;
- upper and lower balance weights placed at opposite ends of said rotor for balancing orbiting movement of said orbiting scroll;
- a pin rotatably coupling at least one of the bushings to a respective one of the main frame and the sub frame;
- and
- a circumferentially continuous barrel shaped band portion presenting a convex surface and formed on said crankshaft to engage at least one of the bushings through a minute gap.
A scroll type compressor comprising:
- a main frame;
- a sub frame;
- a crankshaft rotatably mounted in said main frame and said sub frame via bushings, said crankshaft having an eccentric shaft portion formed thereon, wherein the main frame and sub frame are spaced along the axis of the crankshaft;
- a fixed scroll;
- an orbiting scroll operable with the fixed scroll to compress gas, said orbiting scroll being drivingly mounted on said eccentric shaft portion;
- a electric motor mounted between said main frame and said sub frame and having a rotor coupled to said crankshaft for driving said crankshaft;
- upper and lower balance weights placed at opposite ends of said rotor for balancing orbiting movement of said orbiting scroll;
- and
- two couples formed between said crankshaft and the bushing of said main frame, each of said couples comprising a flat surface on one of said crankshaft and said bushing, and a surface curved in the direction of the axis of rotation of the crankshaft and engaged with said flat surface.
Dependencies are inferred from the claim text.