Claims
- 1. A fluid motor comprising: a body member; an elongated piston axially reciprocally movable within said body member; said body member including motive fluid conducting means cooperable with a source of motive fluid flow for conducting motive fluid to said piston to reciprocally drive said piston; elongated fluid conveying means extending within said body member and said piston; a sealed containment means defined within said motor and adapted to contain therein a quantity of heat transfer medium in isolation from said motive fluid conducting means; said containment means including a pair of variable volume chambers and passageway means communicating between said pair of variable volume chambers; said passageway means including a passage portion extending within said piston such that the heat transfer medium contained in said passage portion is maintained in heat exchange relation with said fluid conveying means; and said piston including means effective to induce a flow of such heat transfer medium within said passage portion during the reciprocal movement of said piston by increasing the volume of one of said variable volume chambers while decreasing the volume of the other of said variable volume chambers.
- 2. A fluid motor as claimed in claim 1 wherein said fluid conveying means includes an elongated tube extending within an axial through bore in said piston.
- 3. A fluid motor as claimed in claim 2 wherein said portion passage includes a peripheral clearance between said bore and said tube.
- 4. A fluid motor as claimed in claim 1 wherein said chambers are located adjacent axially opposed end portions of said piston.
- 5. A fluid motor as claimed in claim 4 wherein the volume of each of said chambers is variable by the movement of said opposed end portions into and out of the respective chamber adjacent thereto during the reciprocal movement of said piston.
- 6. A fluid motor as claimed in claim 1 wherein said heat transfer medium is a gas.
- 7. A fluid motor as claimed in claim 6 wherein said gas is pressurized.
- 8. A fluid motor as claimed in claim 1 wherein said motor is the motor of a fluid operable rock drill and said piston is a hammer piston reciprocal for repetitive impacting on an impact member of said drill.
- 9. A fluid motor as claimed in claim 1 wherein said containment means is adapted to contain a predetermined fixed quantity of such heat transfer medium.
- 10. A fluid motor as claimed in claim 1 wherein said containment means is a constant volume containment means.
- 11. A fluid motor as claimed in claim 1 wherein said containment means is isolated from said motive fluid conducting means in a manner to preclude fluid flow therebetween.
- 12. A fluid motor as claimed in claim 11 wherein said containment means additionally is isolated from the environment exterior to said body member.
Parent Case Info
This is a continuation of application Ser. No. 625,540, filed 10-24-75 now abandoned.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
Country |
Parent |
625540 |
Oct 1975 |
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