US 4,990,071 AGranted

Scroll type fluid apparatus having two orbiting end plates linked together

AssigneeSanden Corporation

InventorKazuo Sugimoto

Life of this patent

Estimating the term…

Loading patent…

Abstract

A scroll type supercharger including first and second orbital spiral elements is disclosed. The supercharger includes a first orbiting scroll having a first orbiting end plate from which a first spiral element extends, and a second oribting end plate fixedly attached to said first orbiting end plate, and from which a second spiral element extends. A hollow portion is formed between the first and second orbiting end plates. The housing includes a first casing further including a first fixed scroll having a first fixed spiral element extending therefrom. The housing also includes a second casing from which a second fixed scroll extends. The first and second casings are fixedly attached to form an operating chamber therein. The orbiting scroll is disposed in the operating chamber such that the orbiting scroll is disposed at an angular and radial offset with said fixed scrolls to form at least one pair of sealed off fluid pockets between interfitting pairs of fixed and orbiting spiral elements. The apparatus further includes a drive shaft having a crank pin disposed about its exterior surface. A longitudinal and radial bore extend through the crank pin, linking central fluid pockets on either side of the orbiting scroll with the hollow portion formed between the first and second orbiting end plates such that the pressure on either side of each orbiting end plate is equalized with the pressure within the outer fluid cavities to prevent bending and warping of the end plates.

Claims15

Dependent claims

In a scroll type fluid apparatus including first and second casings disposed adjacent to each other to form an operating chamber therebetween, said first casing including a first fixed scroll having a first fixed end plate from which a first fixed spiral element extends within said operating chamber, said second casing including a second fixed scroll having a second fixed end plate from which a second fixed spiral element extends within said operating chamber, an orbiting scroll disposed within said operating chamber and having first and second orbiting spiral elements extending from opposite surfaces thereof, said orbiting scroll disposed within said chamber at an angular and radial offset with respect to said first fixed scroll and at an angular and radial offset with respect to said second fixed scroll such that said first fixed spiral element and said first orbiting spiral element interfit to form at least one pair of fluid pockets therebetween, and said second fixed spiral element and said second orbital spiral element interfit to form at least one pair of fluid pockets therebetween, respectively, a drive mechanism including a drive shaft operatively connected to said orbiting scroll to effect orbital motion of said orbiting scroll within said operating chamber, said drive shaft having a balance weight fixedly disposed thereon, and rotation preventing means for preventing rotational motion of said orbiting scroll during orbital motion of said orbiting scroll, the improvement comprising:

said orbiting scroll including first and second orbiting end plate members linked together to enclose a hollow portion therebetween,
said first and said second orbiting spiral elements extending from said first and second orbiting end plate members,
said balance weight disposed in said hollow portion, said balance weight rotating about the longitudinal axis of said drive shaft and within said hollow porition.

In a scroll type fluid apparatus including first and second casings disposed adjacent to each other to form an operating chamber therebetween, said first casing including a first fixed scroll having a first fixed end plate from which a first fixed spiral element extends within said operating chamber, said second casing including a second fixed scroll having a second fixed end plate from which a second fixed spiral element extends within said operating chamber, an orbiting scroll disposed within said operating chamber and having first and second orbiting spiral elements extending from opposite surfaces thereof, said orbiting scroll disposed within said chamber at an angular and radial offset with respect to said first fixed scroll and at an angular and radial offset with respect to said second fixed scroll such that said first fixed spiral element and said first orbiting spiral element interfit to form at least one pair of fluid pockets therebetween, and said second fixed spiral element and said second orbital spiral element interfit to form at least one pair of fluid pockets therebetween, respectively, a drive mechanism including a drive shaft operatively connected to said orbiting scroll to effect orbital motion of said orbiting scroll within said operating chamber, said drive shaft having a crank pin disposed about and fixed thereto, and rotation preventing means for preventing rotational motion of said orbiting scroll during orbital motion of said orbiting scroll, the improvement comprising:

said orbiting scroll including first and second orbiting end plate members linked together to enclose a hollow portion therebetween,
said first and said second orbiting spiral elements extending from said first and second orbiting end plate members, both of said at least one pair of fluid pockets including a central fluid pocket disposed about said drive shaft on opposite sides of said orbiting scroll, said crank pin including a longitudinal conduit extending therethrough and linking said central fluid pockets.

Dependencies are inferred from the claim text.