Variable scroll tip hardness
AssigneeTecumseh Products Company
InventorHubert Richardson, Jr.
Life of this patent
Estimating the term…
Abstract
A process of casting a scroll member for a scroll compressor including forming the scroll wrap member portions of equal height. Unequal cooling of the scroll wrap when formed causes the hardness of the wrap to vary from radially outside to radially inside. The radially outside portions of the scroll wrap are formed harder therefore reducing wear-out of the scroll member while the radially inside portions are formed softer, thereby permitting quicker run-in of the scroll set during initial startup of the scroll compressor.
Claims9
A process for manufacturing a scroll member with a radially inner wrap portion and a radially outer wrap portion, said process comprising the steps of:
- providing a mold to cast the scroll member;
- casting the scroll wrap so that said radially inner wrap portion is even in height with said radially outer wrap portion;
- and
- unequally cooling said radially inner wrap portions and said radially outer wrap portions whereby said unequal cooling causes said radially outer wrap portions to become harder than said radially inner wrap portions.
A scroll member for a scroll compressor, said scroll member comprising:
- a base plate;
- and
- an upstanding involute wrap cast with said base plate, said wrap having a radially inner wrap portion and a radially outer wrap portion, said radially inner wrap portion formed from a softer material than said radially outer wrap portion.
A scroll member for a scroll compressor, said scroll member comprising:
- a base plate of cast iron;
- and
- an upstanding involute wrap having radially inner wrap portions and radially outer wrap portions formed on said base plate by casting and unevenly cooling said base plate and said wrap, whereby said radially inner wrap portions are softer than said radially outer wrap portions.
Dependencies are inferred from the claim text.