Low density counterweight for eccentric driven pump

a technology of eccentric drive and counterweight, which is applied in the direction of positive displacement liquid engine, piston pump, liquid fuel engine, etc., can solve the problems of relative complexity of balance problem, high cost of manufacturing methods required for these materials, machine tool wear, etc., and achieves low density material, easy to machine, and low cost.

Inactive Publication Date: 2005-12-29
STOCKHAUSEN JOEL A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The invention provides an eccentric of the type described having a counterweight portion of a relatively low density material. The material is relatively inexpensive and easy to machine, and also has the benefit of being able to increase the thickness of the counterweight portion of the eccentric, which reduces a moment that is created by the axial spacing of the piston and eccentric.

Problems solved by technology

The radial offset of the nib 22 from the shaft 16 however creates a relatively complicated balance problem, because as the piston head is reciprocating, the lower portion of the connecting rod is orbiting, with a continuum of imbalance from reciprocation to orbiting in between.
The manufacturing methods required for these materials are relatively high in cost, and the materials themselves are, compared to many other materials, difficult to machine and result in machine tool wear.

Method used

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  • Low density counterweight for eccentric driven pump
  • Low density counterweight for eccentric driven pump
  • Low density counterweight for eccentric driven pump

Examples

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Embodiment Construction

[0014]FIG. 4 illustrates an eccentric 18′ of the invention to replace the eccentric 18 of FIG. 3. In other words, eccentric 18′ is for a pump having a piston of the same mass with the center of gravity of the piston in the same position relative to the shaft as the pump that the eccentric 18 is used with. In shape and features, the eccentric 18′ is similar to the eccentric 18, being made in one integral piece, having a nib 22′, a set screw 20′ and a counterweight portion 30′. However, whereas in the prior art the eccentric 18 would have been made out of highly dense material such as steel, zinc or brass, the eccentric 18′ is made of a material of a lower density than the eccentric 18. The density of the prior eccentric 18 and therefore of its counterweight portion 30 in general was greater than 0.2 lbm / in3. For example, die cast zinc has a density of 0.227 lbm / in3, powder metal steel has a density of 0.247 lbm / in3 and brass has a density of 0.310 lbm / in3. In the eccentric 18′, the d...

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Abstract

An eccentric for balancing the piston of an eccentric driven pump has a counterweight portion with a relatively low density between 0.07 lbm / in3 and 0.2 lbm / in3, preferably less than 0.1 lbm / in3.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This claims the benefit of U.S. Provisional Patent Application No. 60 / 583,346 filed Jun. 28, 2004.STATEMENT CONCERNING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not applicable. FIELD OF THE INVENTION [0003] This invention relates to reciprocating pumps, and specifically to eccentric driven pumps. BACKGROUND OF THE INVENTION [0004] Eccentric driven pumps such as reciprocating wobble piston, articulated piston, diaphragm and nutating pumps are well known. Referring to FIG. 1, a typical double-ended eccentric driven wobble piston pump is illustrated. The pump 10 has a motor 12 and a pump assembly 14 at each end of the motor 12. A drive shaft 16 of the motor extends into each pump assembly 14 and is shown at the right end of the pump 10 in FIG. 1. An eccentric 18 is fixed to the shaft 16, for example with setscrew 20 engaging a flat on the shaft 16. Prior to assembling the eccentric 18 to the shaft 16, however, a nib portion 22 (FIG...

Claims

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Application Information

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IPC IPC(8): F04B39/00F04B53/00F04B53/14
CPCF04B39/0022F04B53/144F04B39/0094
InventorSTOCKHAUSEN, JOEL A.
OwnerSTOCKHAUSEN JOEL A