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GB2372781A - Balancing of rocking piston reciprocating machines - Google Patents

Balancing of rocking piston reciprocating machines Download PDF

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Publication number
GB2372781A
GB2372781A GB0026885A GB0026885A GB2372781A GB 2372781 A GB2372781 A GB 2372781A GB 0026885 A GB0026885 A GB 0026885A GB 0026885 A GB0026885 A GB 0026885A GB 2372781 A GB2372781 A GB 2372781A
Authority
GB
United Kingdom
Prior art keywords
cylinder
piston
head portion
machine
crankpin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0026885A
Other versions
GB0026885D0 (en
Inventor
Bryan Nigel Victor Parsons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0026885A priority Critical patent/GB2372781A/en
Publication of GB0026885D0 publication Critical patent/GB0026885D0/en
Publication of GB2372781A publication Critical patent/GB2372781A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00
    • F01B9/02—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with crankshaft
    • F01B9/026—Rigid connections between piston and rod; Oscillating pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/20—Suppression of vibrations of rotating systems by favourable grouping or relative arrangements of the moving members of the system or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
    • F01B11/004—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type in which the movement in the two directions is obtained by two single acting piston motors, each acting in one direction
    • F01B2011/005—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type in which the movement in the two directions is obtained by two single acting piston motors, each acting in one direction with oscillating pistons, i.e. the pistons are arranged in ring like cylinder sections and oscillate with respect to the center of the ring

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

A single cylinder reciprocating machine comprising a closed plane cylinder, valve or port means being provided for the admission and removal of the working media, a piston assembly, characterized in that said piston has a head portion which is slidingly sealed in the cylinder and a connecting rod portion which extends axially from the head portion, the end of the connecting rod portion remote from the head portion being rotationally connected to a crankpin on a crankshaft, so that the centre of gravity of the piston assembly substantially coincides with the axis of the pivotal connection to the crankpin. The machine might be used as an internal combustion engine, an air compressor or hydraulic machine. Multi-cylinder arrangements might comprise a plurality of such single cylinder machines.

Description

Balancing of Rocking Piston Reciprocating Machines The present invention relates to single cylinder reciprocating machines of the crank slider type and in particular to the construction and balance of the reciprocating parts.
Traditionally the balance of such machines is achieved approximately by providing a counterweight to neutralize the rotating mass of the conrod assembly and half of the effective mass of the piston. Other more complicated arrangements are sometimes used such as providing a dummy piston and conrod assembly moving anti-phase, or by utilizing balancer shafts. Such a machine might be used as an internal combustion engine or as a pump.
According to one aspect of the current invention a single cylinder reciprocating machine comprises a closed plane cylinder, valve or port means being provided for the admission and removal of the working media, a piston assembly, characterized in that said piston has a head portion which is slidingly sealed in the cylinder and a connecting rod portion which extends axially from the head portion, the end of the connecting rod portion remote from the head portion being rotationally connected to a crankpin on a crankshaft, so that the centre of gravity of the piston assembly substantially coincides with the axis of the pivotal connection to the crankpin.
When the crankshaft is rotated at constant speed, the resultant radial out of balance force is of constant magnitude and can be completely balanced by the attachment of counterweights to the crankshaft.
The centre of gravity condition can be achieved by providing an extension to the piston assembly diametrically opposite to the piston head portion to provide the necessary weight.
A number of piston machines might be advantageously joined to cooperate to form a multi-cylinder machine so that the whole machine might be completely balanced. In
particular a two cylinder four stroke internal combustion engine could be made in which the two pistons are attached to the same crank and move in phase and parallel to each other. Such an arrangement would provide even ignition intervals and could be wholly balanced in accordance this invention.
Various embodiments of the invention are now described, by way of example only, with reference to the accompanying drawings, in which; Figure 1 illustrates a single cylinder two stroke engine in accordance with the present invention, in which inlet port 11 and exhaust port 12 control the gas flow in the engine; Figure 2 illustrates a three dimensional view of the piston assembly attached to crankshaft of figure 1; As illustrated in Figure 1, a single cylinder reciprocating machine comprises a closed cylinder 10. A piston 16 is slidingly located in the cylinder 10, and the piston 16 is sealed with respect to the walls of the cylinder 10 by means of a piston ring 15. The piston has attached a plate 25 to control the opening of the exhaust port. The piston head 14 has a a surface 21 that cooperates with the cylinder 10, the surface 10 having a spherical shape with a radius nominally equal to the radius of the cylinder 10. The piston 16 is pivotally connected by crankpin 18 to crankshaft 17 which is rotatively mounted with respect to a crankcase 19. The piston 16 includes a weight 9 attached in a direction diametrically opposite the piston head 14 to position the centre of gravity of piston 16. The piston head 14 is thereby constrained by the crankshaft 17 crankpin 18 and cylinder 10 to move in reciprocating motion within the cylinder 10. The combined centre of gravity of the piston 16 and the piston ring 15 and port control plate 25 coincides with the centre of crankpin 18 In operation at constant speed of crankshaft 19, the rotating and reciprocating components of the piston 16 and the piston ring 15 and the plate 25 and weight 9 produce a force that is a rotating vector of constant magnitude rotating at the speed of crankshaft 19 which when balanced by suitable counterweights (not shown) attached to crankshaft 19 results in the elimination of all shaking forces and moments except the moment associated with the inertia and motion of the piston 16 which is in a plane perpendicular to the crankshaft and is additive to the torque pulses produced by the operation of the machine against pressure within the cylinder.

Claims (7)

Claims
1. A single cylinder reciprocating machine comprising a closed plane cylinder, valve or port means being provided for the admission and removal of the working media, a piston assembly, characterized in that said piston has a head portion which is slidingly sealed in the cylinder and a connecting rod portion which extends axially from the head portion, the end of the connecting rod portion remote from the head portion being rotationally connected to a crankpin on a crankshaft, so that the centre of gravity of the piston assembly substantially coincides with the axis of the pivotal connection to the crankpin.
2. A plurality of single cylinder reciprocating machines according to claim 1 joined to cooperate to form a multi-cylinder machine so that the whole machine might be completely balanced.
3. A four stroke internal combustion engine balanced according to any one of the preceding claims
4. A two stroke internal combustion engine balanced according to any one of claims loir 2.
5. A Hydraulic piston pump balanced according to any one of claims 1 or 2.
6. An air compressor piston pump balanced according to any one of claims 1 or 2..
7. A four stroke internal combustion engine according to claim 2 in which two pistons are attached to the same crank and move in phase and parallel to each other.
GB0026885A 2000-11-03 2000-11-03 Balancing of rocking piston reciprocating machines Withdrawn GB2372781A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0026885A GB2372781A (en) 2000-11-03 2000-11-03 Balancing of rocking piston reciprocating machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0026885A GB2372781A (en) 2000-11-03 2000-11-03 Balancing of rocking piston reciprocating machines

Publications (2)

Publication Number Publication Date
GB0026885D0 GB0026885D0 (en) 2000-12-20
GB2372781A true GB2372781A (en) 2002-09-04

Family

ID=9902492

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0026885A Withdrawn GB2372781A (en) 2000-11-03 2000-11-03 Balancing of rocking piston reciprocating machines

Country Status (1)

Country Link
GB (1) GB2372781A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008045580B3 (en) * 2008-01-10 2009-05-07 Manfred Wanzke Connecting-rod piston compressor for use as two stroke diesel engine, has connecting-rod piston closing exhaust ports and opening inlet ports or opening exhaust ports and closing inlet ports or closing exhaust and inlet ports
CN101655152B (en) * 2009-06-10 2011-09-28 北京中清能发动机技术有限公司 Single action piston for crank round sliding block mechanism as well as internal-combustion engine and compressor thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848954A (en) * 1955-10-28 1958-08-26 Budzich Tadeusz Wobbler type multiple piston pump
GB1388904A (en) * 1971-03-11 1975-03-26 Salzmann W E Machines having reciprocating pistons
US3961868A (en) * 1974-02-21 1976-06-08 Thomas Industries, Inc. Air compressor
GB1555066A (en) * 1976-02-13 1979-11-07 Salzmann W E Rockingpiston machine
US4275999A (en) * 1979-08-27 1981-06-30 Thomas Industries, Inc. Air compressor with ramped intake valve
US5186137A (en) * 1987-02-27 1993-02-16 Salzmann Willy E Rocking-piston machine
EP0588466A1 (en) * 1992-09-14 1994-03-23 DeVILBISS AIR POWER COMPANY Wobble piston

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848954A (en) * 1955-10-28 1958-08-26 Budzich Tadeusz Wobbler type multiple piston pump
GB1388904A (en) * 1971-03-11 1975-03-26 Salzmann W E Machines having reciprocating pistons
US3961868A (en) * 1974-02-21 1976-06-08 Thomas Industries, Inc. Air compressor
GB1555066A (en) * 1976-02-13 1979-11-07 Salzmann W E Rockingpiston machine
US4275999A (en) * 1979-08-27 1981-06-30 Thomas Industries, Inc. Air compressor with ramped intake valve
US5186137A (en) * 1987-02-27 1993-02-16 Salzmann Willy E Rocking-piston machine
EP0588466A1 (en) * 1992-09-14 1994-03-23 DeVILBISS AIR POWER COMPANY Wobble piston

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008045580B3 (en) * 2008-01-10 2009-05-07 Manfred Wanzke Connecting-rod piston compressor for use as two stroke diesel engine, has connecting-rod piston closing exhaust ports and opening inlet ports or opening exhaust ports and closing inlet ports or closing exhaust and inlet ports
CN101655152B (en) * 2009-06-10 2011-09-28 北京中清能发动机技术有限公司 Single action piston for crank round sliding block mechanism as well as internal-combustion engine and compressor thereof

Also Published As

Publication number Publication date
GB0026885D0 (en) 2000-12-20

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)