Crankshaft, compressor using crankshaft, and method for assembling a compressor including installing crankshaft
AssigneeBristol Compressors, Inc.
InventorsGordon T. Boyd, Robert D. Douglas, Joseph T. Hill
Life of this patent
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Abstract
A crankshaft having at least two eccentric members of different diameter and a method of assembling a reciprocating compressor using a crankshaft having at least two eccentric members of different diameter are provided. A crankshaft having two eccentric members of different diameter is provided for more easily assembling a four-cylinder reciprocating compressor. The eccentric member having a smaller diameter is more easily inserted through apertures of connecting rods having a larger diameter than the eccentric member.
Claims21
A crankshaft for a reciprocating compressor including at least two connecting rods, each having a connecting rod aperture, the crankshaft comprising:
- an elongated shaft defining a longitudinal axis;
- a first eccentric member having a first diameter and a first center offset from the longitudinal axis;
- a second eccentric member having a second diameter and a second center offset from the first center and the longitudinal axis, the second diameter being larger than the first diameter;
- and
- a transfer section connecting the first eccentric member to the second eccentric member,
- wherein the first and second diameters of the first and second eccentric members respectively define peripheral portions of the first and second eccentric members, and
- wherein the transfer section includes first and second ramp portions respectively extending substantially to the peripheral portions of the first and second eccentric members, thereby providing a substantially smooth transition surface for being inserted through the connecting rod apertures.
A compressor comprising:
- a block defining an internal cavity, at least one aperture in communication with the internal cavity, and at least two cylinders;
- a crankshaft received within the internal cavity, the crankshaft comprising:
- an elongated shaft defining a longitudinal axis;
- a first eccentric member having a first diameter and a first center offset from the longitudinal axis;
- a second eccentric member having a second diameter and a second center offset from the first center and the longitudinal axis,
- wherein the first diameter is smaller than the second diameter;
- a first connecting rod having an aperture defining a diameter substantially equal to the first diameter, the first eccentric member rotatably supporting the first connecting rod;
- and
- a second connecting rod having an aperture defining a diameter substantially equal to the second diameter, the second eccentric member rotatably supporting the second connecting rod.
A method for assembling a compressor having a block defining an internal cavity, at least one aperture in communication with the internal cavity, and a first cylinder and a second cylinder, the method comprising:
- inserting a first connecting rod into the first cylinder of the block;
- inserting a second connecting rod into the second cylinder of the block;
- inserting a crankshaft through the aperture in the block, the crankshaft having a first eccentric member defining a first diameter and a second eccentric member defining a second diameter larger than the first diameter;
- inserting the crankshaft further into the block such that the first eccentric member is passed through an aperture in the second connecting rod having a diameter substantially equal to the second diameter of the second eccentric member;
- and
- inserting the crankshaft further into the block such that the first eccentric member is received within an aperture in the first connecting rod having a diameter substantially equal to the first diameter of the first eccentric member, and the second eccentric member is received in the aperture in the second connecting rod,
- wherein the first eccentric member rotatably supports the first connecting rod and the second eccentric member rotatably supports the second connecting rod.
Dependencies are inferred from the claim text.