US3714781A - Device for examining the piston rings in free-floating piston engines - Google Patents

Device for examining the piston rings in free-floating piston engines Download PDF

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Publication number
US3714781A
US3714781A US00205905A US3714781DA US3714781A US 3714781 A US3714781 A US 3714781A US 00205905 A US00205905 A US 00205905A US 3714781D A US3714781D A US 3714781DA US 3714781 A US3714781 A US 3714781A
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United States
Prior art keywords
piston
shaft
output
signal
producing
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Expired - Lifetime
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US00205905A
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English (en)
Inventor
W Raetiger
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Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Priority claimed from DE19712105114 external-priority patent/DE2105114C/de
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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    • 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
    • F01B11/08—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type with direct fluid transmission link
    • 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
    • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft

Definitions

  • a device for use in examining the piston rings of free-floating piston engines wherein power from the pistons is transmitted to the engines power output shaft through a hydrostatic motion converter system.
  • the device includes piston detector means associated with each of the pistons in the engine for respectively producing a continuous output signal corresponding to the momentary or instantaneous position of their associated piston.
  • a shaft detector is located adjacent the engines output shaft and is adapted to produce an output signal corresponding to the momentary or instantaneous angular position of the shaft.
  • Independent comparator means are operatively connected between each of the piston detectors and the shaft detector for comparing the signals produced thereby and generating separate synchronization error signals for each of the pistons.
  • Fluid control means is operatively connected to the comparator means for selectively adding liquid to or removing liquid from the hydrostatic converter system in response to the synchronizing signal so that the synchronization error between the pistons and the shaft is reduced.
  • An adjustable signal generator for selectively producing output signals corresponding to predetermined output shaft positions, is selectively connected to the comparator means by a switch so that when the signal generator is connected to the comparators, the latter generate predetermined synchronization error signals to operate the fluid control means and thereby move the pistons to predetermined positions independently of the actual position of the engines output shaft.
  • the present invention relates to apparatus for use in examining piston engines and in particular to a device for examining the piston rings of a free-floating piston engine.
  • the piston rings In large diesel engines, particularly those engines which are utilized to power ships or ocean-going vessels, the piston rings must be examined for wear or looseness in mounting after approximately every 1,000 hours of operation.
  • the engine typically is turned over slowly, by means of a highly geared down motor connected to the engine drive shaft, until a piston ring of one of the pistons appears before the intake .or exhaust slot adjacent the piston. After the piston ring has been checked, the engine must again be turned over until the next ring appears. Accordingly, only one ring can be examined at a time and the maneuver must be repeated until all of the piston rings of all of the pistons have been examined.
  • Another object of the present invention is to examine the piston rings of free-floating piston engines by'a method which is relatively rapid and inexpensive.
  • Yetanother object of the present invention is to examine the piston rings of free-floating piston engines by a method and apparatus which is relatively simpleand accurate in operation.
  • the piston rings of a free-floating piston engine wherein power from the piston is transmitted to the en'- gines power output shaft through a hydrostatic motion converter, are examined by a device which avoids the above-mentioned drawbacks of conventional examining systems and substantially shortens the examination period.
  • a piston detector is associated with each of the pistons in the engine for producing a continuous output signal corresponding to the momentary or instantaneous position of its associatedpiston as it passes through its cycle.
  • a single shaft detector is located adjacent the engines output shaft to detect the instantaneous angular position of the shaft and produce an output signal representative of that position.
  • Independent comparator means are'operatively connected between each of the piston detectors and the shaft detector for comparing the output signals produced thereby and generating a synchronizing error signal for each of the pistons, which signals are supplied to independent fluid control means.
  • the latter are adapted to selectively add liquid to or remove liquid from the hydrostatic converter system between its associated piston and the output shaft in response to the synchronizing signals, so that the synchronization errors between the respectivepistons and the shaft are reduced.
  • an adjustable signal generator which is adapted to selectively produce output signals corresponding to predetermined output shaft positions is selectively connected to the comparator means, through a switch, to cause the comparator means to generate predetermined synchronization error signals.
  • These signals activate the fluid control means in a predetermined manner and thereby cause the pistons to move to predetermined positions in accordance with the selected output signals of the signal generator.
  • liquid can be supplied or removed from the hydrostatic system in order to raise or lower the'pistons independently of the position of the engines output shaft, in order to present the piston rings adjacent the examining port.
  • the examination of the piston rings can be performed without regard to the angular position of the output shaft of the engine. Rather, the examination is conducted by the application of predetermined signals to the system which signals can be preselected on the signal generator to correspond to those positions of the output shaft when the desired piston rings are in position for examination.
  • a single signal generator is utilized and connected to all of the comparator means associated with the various pistons in the engine, so that all ofthe pistons will move simultaneously and in parallel relationship into their examining positions.
  • FIG. 1 is a schematic illustration of a synchronizer control system for a free-floating piston'engine with a hydrostatic motion converter in accordance with an embodiment of the present invention
  • FIG. 2 is a schematic block diagram of the control arrangement for a free-floating piston engine having a single piston
  • FIG. 3 is a schematic block diagram of the examining control arrangement for a free-floating piston engine having a plurality of pistons controlled by a single signal generator.
  • a free-floating piston engine E of generally conventional construction has a working cylinder 1 in which a driving piston 2 is received to define a combustion chamber 2. wherein the fuel for driving the engine is combusted with air in the well known manner.
  • Piston 2 is connected by a rod 3 to a lifting piston 3 which constitutes part of the hydrostatic motion converter of the system.
  • Piston 3 is received in liquid tight relation within a conduit or chamber 4' which contains liquid 4 under pressure therein.
  • the opposite end of conduit 4 is in fluid communication with a conventional rotary converter 5 so that as piston 2 is reciprocated upon combustion of fuel within chamber 2', the force of combustion is applied, through piston 3, fluid 4 and rotary converter 5 to rotate the output shaft 6 of the engine.
  • a signal generator or piston detector device 7 is located adjacent work cylinder 1 in order to detect the momentary, i.e., instantaneous position of piston 2 and generate an electrical signal representative of that position, which signal is transmitted through line 7
  • Detector 7 may be an electromagnetic detecting device which is adapted to pick up a recorded signal on piston 2, a photoelectric device or other well known position detecting devices as are used in the art.
  • a second detector and signal generator 8 is located adjacent output shaft 6 of the engine. Detector 8 detects the momentary or instantaneous angular location of the shaft and produces a continuous output signal which is representative of the instantaneous shaft position.:
  • the synchronization signal produced by comparator 9, which is of conventional construction, ' is utilized to control a liquidcontrol member 10, which may be a slide valve or the like, so that liquid under pressure will either flow in the direction of the arrow, from a source 11 thereof, to conduit 4, or will flow out of the conduit 4', .through control member 10, in the direction of arrow 12.
  • the synchronization error signal will add or remove liquid from conduit 4 in order to adjust the position of piston 2 with respect to shaft 6 so that the piston and shaft are in perfect synchronization.
  • the system is adapted to maintain the angular position of the shaft 6 in synchronization with corresponding positions of piston 2.
  • FIG. 2 of the drawings a diagram of the control system of the invention is illustrated, wherein it is seen that a switch 13 is provided between detector or generator 8 and a selectively operative electric signal generator l4.
  • the signal generator is constructed to produce manually selectable signals corresponding to signals generated by detector 8,'but it is adapted to develop only as many in dividual predetermined signals as there are piston rings on the piston. These signals each correspond to the signal generated by detector 8 when shaft 6 is in a synchronized position with the selected piston ring on the piston adjacent the air port or examining hole in the engine.
  • switch 13 is actuated to connect signal generator 14 to the circuit and render detector 8 inoperative.
  • Generator 14 is then adjusted to generate a signal corresponding to the position of the generator 14 is connected to comparing means 9, the
  • shaft 6, and the propeller may be inspected in separate operations while the piston rings are being simultaneously ex- '-amined
  • This is a substantial improvement over the inspection procedures which previously have been proposed in which .inspection was limited only to sequential inspection of piston rings, the propeller shaft and propeller itself.
  • FIG. 3 a schematic diagram of the detecting apparatus and comparators of the present invention are illustrated as they are utilized in a freefloating piston engine having a plurality of n driving pistons with independent piston detectors 7; 7,,, fluid controls 10, 10 and corresponding comparators 9, 9, connected therebetween', for controlling the slides or valves of liquid controls 10, 10,,.
  • the single signal generator 8 associated with driving shaft 6 may be switched over to the single control signal generator 14 so that all of the pistons are brought simultaneously and in parallel into their various positions for examining their piston rings.
  • control apparatus of the present invention holds each piston in the position set on signal generator 14, regardless of the angular position of driving shaft 6,
  • any other desired examination can be made on the propulsion aggregate, i.e., the ships propeller shaft. Accordingly, it is seen that these latter examinations maybe performed quite independently of the examination of the piston rings so that unnecessary time is not lost in the examination procedures. Moreover, the pistons are readily and rapidly moved to the desired piston examination positions so that each of the piston rings can be examined sequentially without the necessity of turning over the engine shaft each time a different ring is to be examined.
  • a device for use in examining the piston rings of free-floating piston engines wherein power from the pistons is transmitted to the power output shaft through a hydrostatic motion converter system comprising, piston detector means associated with each of the pistons in said engine for producing output signals corresponding to the momentary position of its associated piston, shaft detector means for detecting the momentary angular position of said shaft and producing an output signal corresponding to said predetermined angular position; independent comparator means operatively connected to each of said piston detectors and said shaft detector for comparing the signals produced thereby and generating a synchronizing error signal for its associated piston, fluid control means operatively connected to said comparator means for selectively adding liquid to or removing liquid from said hydrostatic converter system in response to said synchronizing signal whereby the synchronization error between said pistons and said shaft is reduced, an adjustable signal generator for selectively producing output signals corresponding to predetermined engine output shaft positions, and switch means for selectively connecting said compara tor means to said signal generator and said shaft detecting means, whereby when switched to said adjustable signal generator

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Testing Of Engines (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Servomotors (AREA)
US00205905A 1971-02-04 1971-12-08 Device for examining the piston rings in free-floating piston engines Expired - Lifetime US3714781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712105114 DE2105114C (de) 1971-02-04 Einrichtung zur Überprüfung der Kolbenringe in Freiflugkolben maschinen

Publications (1)

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US3714781A true US3714781A (en) 1973-02-06

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US00205905A Expired - Lifetime US3714781A (en) 1971-02-04 1971-12-08 Device for examining the piston rings in free-floating piston engines

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US (1) US3714781A (da)
JP (1) JPS4948885B1 (da)
DK (1) DK136994C (da)
GB (1) GB1324216A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530317A (en) * 1984-04-20 1985-07-23 Eaton Corporation Variable displacement free piston engine
US20200346535A1 (en) * 2019-04-30 2020-11-05 Blount, Inc. Electric-powered gas engine replacement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157876B (de) * 1961-11-02 1963-11-21 Beteiligungs & Patentverw Gmbh Vorrichtung zur Regelung des Gleichlaufs von Hubverdraenger und Rotationsverdraenger bei Bewegungswandlern
US3335640A (en) * 1965-12-01 1967-08-15 Beteiligungs & Patentverw Gmbh Dead center point controlling device
US3635014A (en) * 1969-01-27 1972-01-18 Herwig Kress Method and device for controlling the piston movement of hydrostatic prime movers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157876B (de) * 1961-11-02 1963-11-21 Beteiligungs & Patentverw Gmbh Vorrichtung zur Regelung des Gleichlaufs von Hubverdraenger und Rotationsverdraenger bei Bewegungswandlern
US3335640A (en) * 1965-12-01 1967-08-15 Beteiligungs & Patentverw Gmbh Dead center point controlling device
US3635014A (en) * 1969-01-27 1972-01-18 Herwig Kress Method and device for controlling the piston movement of hydrostatic prime movers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530317A (en) * 1984-04-20 1985-07-23 Eaton Corporation Variable displacement free piston engine
US20200346535A1 (en) * 2019-04-30 2020-11-05 Blount, Inc. Electric-powered gas engine replacement

Also Published As

Publication number Publication date
JPS4948885B1 (da) 1974-12-24
DK136994B (da) 1977-12-27
DE2105114A1 (da) 1972-08-03
DK136994C (da) 1978-06-05
GB1324216A (en) 1973-07-25

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