Scroll type fluid machinery having a tilt regulating member

• US 5,145,346 A
• Filed: 06/10/1991
• Issued: 09/08/1992
• Est. Priority Date: 12/06/1990
• Status: Expired due to Term

• Current Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
• Original Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
• Inventors: Tanigaki, Ryuhei, Iio, Takayuki
• Primary Examiner(s): Vrablik, John J.
• Application Number:
  US07/713,057
• Time in Patent Office: 456 Days
• Field of Search: 418/55.5, 418/57, 418/151
• US Class Current: 418/55.5
• CPC Class Codes: F01C 1/0215 where only one member is moving
• CPC Class Codes: F01C 21/003 Systems for the equilibration of forces acting on the elements of the machine interstice adjustment other than by fluid pressure F01C21/102
• CPC Class Codes: F04C 2230/60 Assembly methods
• CPC Class Codes: F04C 2240/807 Balance weight, counterweight
• CPC Class Codes: F05B 2230/60 Assembly methods

Abstract

A scroll type fluid machinery provided with a slide type radius of revolution variable mechanism prevents unilateral working of a rotating bearing 23 due to tilted rotation of a drive bushing 21 and a balance weight 27 fixed thereto. A bolt 41 for regulating tilted rotation is projected at an inner end of a rotary shaft 7, a shaft portion 41a therefor penetrates through a hole 42 bored in the balance weight 27, and a bearing surface 41c of a head 41b thereof is brought into slidable contact with the inner end surface of the balance weight 27. When the radius of revolution is varied at the time of revolution in a solar motion of a revolving scroll 14, an eccentric driving pin 25 slides in a slide groove 24 and the shaft portion 41a of the bolt 41 slides in hole 42 at the same time. In the interim, the bearing surface 41c of the head into slidable contact with the inner end surface of the balance weight 27, thereby to suppress tilted rotation of the balance weight 27.

Claims

1. A scroll type fluid machinery comprising a stationary scroll and a revolving scroll both having end plates with inner and outer surfaces, spiral wraps being provided on the inner surfaces of the end plates of both the stationary scroll and the revolving scroll, the spiral wraps being engaged with each other, a boss of said end plate on said revolving scroll, a drive bushing being inserted rotatably into said boss which is projected at a central part of the outer surface of the end plate of said revolving scroll, an eccentric driving pin projected at an end of a rotary shaft being fitted slidably into a slide groove which is bored in said drive bushing, and a balance weight for balancing dynamic unbalance caused by revolution in a solar motion of said revolving scroll being provided on said drive bushing, a tilted rotation regulating member projecting from the end of said rotary shaft penetrates through a hole which is bored in said balance weight, the hole having a size which allows sliding of said drive bushing, and a regulating surface being in slidable contact with an end surface of said balance weight being provided at a tip of said tilted rotation regulating member.

2. The scroll type fluid machinery according to claim 1, wherein said tilted rotation regulating member is constructed of a bolt provided with a head which forms said regulating surface.

3. The scroll type fluid machinery according to claim 1, wherein a shim is interposed between said regulating surface and the end surface of said balance weight.

4. The scroll type fluid machinery according to claim 1, wherein a snap ring which forms said regulating surface is installed at a tip of a pin forming said titled rotation regulating member.