Combined crankshaft

Abstract

The invention discloses a combined crankshaft. The combined crankshaft comprises a driving end, a non-driving end and a crank. The driving end comprises a driving end main journal and a driving end crank pin. The axes of the driving end main journal and the driving end crank pin are parallel but not in the same line, and the non-driving end comprises a non-driving end main journal and a non-driving end crank pin. The axes of the non-driving end main journal and the non-driving end crank pin are parallel but not in the same line. Two through holes are formed in the crank in parallel and at intervals. The two through holes are a first through hole and a second through hole. The extension section of the driving end crank pin of the driving end is installed in the first through hole, and the extension section of the non-driving end crank pin of the non-driving end is installed in the second through hole. The structure of the combined crankshaft has the characteristics of high bearing capacity and high geometric precision, and solves the problems existing in an existing cantilever beam crankshaft and large-diameter crankshaft.

Description

technical field [0001] The invention belongs to the technical field of compressors, in particular to a combined crankshaft structure for traditional miniature and small reciprocating compressors. Background technique [0002] In today's world, requiring mechanical power equipment not to produce environmental pollution and atmospheric smog has become one of the most important evaluation indicators, and it has also become an inevitable trend of new development. Most of the traditional miniature and small air compressors with an annual output of millions of units in my country are oil splashed to lubricate the piston and cylinder. It enters the cylinder through the sliding gap between the cylinder and the piston, and is discharged together with the compressed air, and the discharged compressed air is released into the atmospheric environment after being decompressed, so that the atmospheric environment is polluted by lubricating oil mist, that is, smog. The waste oil is also an ...

AI Technical Summary

Problems solved by technology

Because dry friction bearings are not feasible for connecting rod big end bearings that bear heavy loads, generally only grease-lubricated sealed rolling bearings can be used. In the existing oil-free air compressors, in order to apply sealed rolling bearings, the crankshaft can only be made into a cantilever The crankshaft of the beam, such as figure 1 As shown, so that the bearing fits on the crank pin, the crank pin of this kind of crankshaft is affected by the bearing clearance and shaft deflection, so that the connecting rod shaft cannot be perpendicular to the crank pin, which is very easy to cause damage to the bearing

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