Uncooled oilless internal combustion engine having uniform gas squeeze film lubrication
Patent 4846051 Issued on July 11, 1989. Estimated Expiration Date: 
February 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 23, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2857220 Cylinder liner for an internal combustion engine Crank guide assembly for internal combustion engines, in particular two-stroke internal combustion engines with facing cylinders Ceramic turbocharger Piston of refractory materials, particularly for compression-ignition engines Metal-ceramic composite article and a process for manufacturing the same Patent #: 4719075 InventorsAssigneeApplicationNo. 07/159614 filed on 02/23/1988US Classes:92/127, Fluid pressure type123/193.4, Having detail to guiding structure cooperating with cylinder92/153, WITH LUBRICATING MEANS92/154, Lubricant entrained by working fluid92/162R, SPACED CYLINDER AND PISTON WALLS DEFINE PASSAGE BETWEEN OPPOSED PISTON SIDE WALL ENDS92/170.1, Nonmetallic piston contacting portion92/248, Nonmetallic portion92/261MISCELLANEOUS (E.G., CRANKCASE)ExaminersPrimary: Garrett, Robert E.Assistant: Williamson, Michael A. Attorney, Agent or FirmInternational ClassesF01M 9/00 (20060101)F02F 7/00 (20060101) F02B 41/00 (20060101) AbstractAn apparatus for providing a gas phase film lubrication between a reciprocal piston and a cylinder of an uncooled oilless internal combustion engine; the piston is effective to drive a rotary crankshaft in response to an expanding gas charge. The apparatus comprises: (a) means connecting the crankshaft to said piston for transferring reciprocal thrust into rotary thrust, such means aligning the piston concentrically within the cylinder wall to limit the imposition of side loads on said piston (i.e., less than 80 psi); (b) interfacing walls on the piston and cylinder (i) sized to provide a predetermined annular gap therebetween at ambient conditions that has a radial dimension in the range of 0.001&#b1;0.0005 inches, (ii) consisting of matched materials that prevent closure of the gap due to thermal expansion under the maximum temperature differential to be experienced between the piston and cylinder wall, and (iii) are preshaped to anticipate any thermal growth of the interfacing walls for maintaining the annular gap substantially constant at elevated temperatures.Other References
Field of SearchWITH DIFFERENTIAL RADIAL THRUST PRODUCING MEANS FOR WORKING MEMBERFluid pressure type WITH LUBRICATING MEANS Lubricant entrained by working fluid Piston has lubricant retaining or conducting means Pocket or chamber SPACED CYLINDER AND PISTON WALLS DEFINE PASSAGE BETWEEN OPPOSED PISTON SIDE WALL ENDS With separable means for pivotally mounting connecting rod to piston Frusto conical skirt With nonmetallic portion Nonmetallic portion | |
