US3691641A - Tool for establishing ignition timing of a reciprocating internal combustion engine - Google Patents

Tool for establishing ignition timing of a reciprocating internal combustion engine Download PDF

Info

Publication number
US3691641A
US3691641A US124082A US3691641DA US3691641A US 3691641 A US3691641 A US 3691641A US 124082 A US124082 A US 124082A US 3691641D A US3691641D A US 3691641DA US 3691641 A US3691641 A US 3691641A
Authority
US
United States
Prior art keywords
crankshaft
engine
frame member
tool
piston
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.)
Expired - Lifetime
Application number
US124082A
Other languages
English (en)
Inventor
John M Bell
Robert A Mooney
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.)
Ford Motor Co
Original Assignee
Ford Motor Co
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 Ford Motor Co filed Critical Ford Motor Co
Application granted granted Critical
Publication of US3691641A publication Critical patent/US3691641A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/02—Checking or adjusting ignition timing
    • F02P17/04—Checking or adjusting ignition timing dynamically

Definitions

  • ABSTRACT An elongated bar that engages the engine crankshaft for rotation therewith has a pad for contacting a pan rail of the engine block when the number one piston of the engine is at its top dead center position. A pin slidable in the bar then is extended to position a timing plate on the engine block. Tightening the timing plate in this position establishes accurately the location of the plate relative to the number one piston.
  • Ignition timing of reciprocating internal combustion engines has a considerable effect on vehicle emission levels and extensive research and development has been conducted in recent years to determine optimum timing for all phases of engine operation.
  • the effectiveness of optimum timing of course depends on initial timing settings,jhowever, and prior art techniques of setting initial timing have been found to introduce variations that have a significant effect on emissions.
  • a crankshaft damper or pulley mounted on the projecting portion of the engine crankshaft has at least one scribed mark on its exterior surface that coincides with a timing pointer mounted on the engine block when the number one piston is at its top dead center (TDC) position.
  • Ignition timing is set dynamically at a predetermined engine speed with a strobe light synchronized with the ignition pulse for the number one cylinder.
  • the strobe light is aimed at the timingpointer and its impulses provide a visual indication of the relationship between the pointer and the scribed mark on the crankshaft damper or pulley.
  • Rotating the ignition distributor sets the timing to the desired value.
  • This invention provides a tool for use in timing a reciprocating internal combustion engine that accurately establishes the position of a timing plate relative to a reference position of an engine piston.
  • the tool can be manufactured economically and used efficiently.
  • the tool comprises a frame member having an engaging device for engaging theframe member with the engine crankshaft. When so engaged, the frame member is rotatable relative to the engine block along with the crankshaft. A pad included on the frame member contacts a surface of the engine block when the frame member and crankshaft have rotated to the point where the reference piston is in a reference position, usually the top dead center position of the number one piston. With the frame member in this position, a locating member is moved into contact with the timing plate which then is fastened tightly to the engine block to establish accurately the relationship between the timing plate and the reference position of the piston.
  • the frame member typically is an elongated bar that has attached thereto a cylindrical member capable of sliding into and out of engagement with the portion of the engine crankshaft projecting from the front of the engine block.
  • a locking key integral with the cylindrical member slides into a keyway on the crankshaft to connect nonrotatably the frame member to the crankshaft.
  • the frame member When so engaged with the crankshaft, the frame member extends laterally across the front of the engine block.
  • the pad usually is attached to the frame member at a location laterally removed from the cylindrical member where the pad contacts the machined surface forming a portion of the pan rail of the block.
  • a handle can be attached to the other lateral end of the frame member to permit easy, manual rotation of the frame member and engine crankshaft.
  • the frame member can be attached to a pneumatic, hydraulic, or electrical machine that automatically rotates the pad into contact with the pan rail.
  • retractable pin is included in the frame member at a location where extending the pin slides it into contact with a socket in the timing plate when the reference pad contacts the pan rail.
  • FIG. 1 is a front elevation of a partially assembled V- 8 type reciprocating internal combustion engine showing the relationship thereto of the timing plate and the frame member, pad, and locating pin of a tool of this invention.
  • FIG. 2 is a top view of a tool showing the cylindrical member that engages the frame member with the engine crankshaft.
  • FIG. 3 is a partial sectional view taken through the locating pin and engaging member of the tool.
  • the block 10 of a reciprocating V-8 type internal combustion engine has an engine crankshaft 12 mounted rotatably therein. Eight pistons are attached in the conventional manner to crankshaft 12 for reciprocating movement in block 10 and the number one piston is represented in the drawing by numeral 14.
  • the lower side of block 10 contains a pair of longitudinal pan rails 16 and 18 that extend along the lower edges of the block. Pan rails 16 and 18 are machined to receive the engine pan (not shown) that is subsequently attached to the block.
  • An ignition timing plate 20 is attached by two threaded fasteners 22 and 24 to the front of engine block Ill). Plate 20 has a portion .26 that projects outwardly from the engine block and portion 26 has a boss 28 attached thereto to define a locating socket 30.
  • the tool of this invention comprises a frame member 32 that is in the shape of an elongated bar.
  • a projecting handle 34 is attached to one end of the frame member and an engaging member 36 is attached to its central portion.
  • Engaging member 36 includes a plate 38 having a hollow cylindrical member 40 projecting inwardly therefrom (FIG. 2).
  • the opening in cylindrical member 40 fits on the projecting end of crankshaft 12 and has an integral key 42 that slides into a corresponding keyway 44 on the crankshaft to nonrotatably attach the frame member to the crankshaft (FIG. 3).
  • the bar includes a portion 46 that projects radially from cylindrical member 40 and terminates just short of timing plate 20 when cylindrical member 40 engages the engine crankshaft.
  • a pin 48 is located slidably in projecting portion 46 and is spring loaded by a spring 50 to an extended position.
  • the axially outer face of projecting portion 46 contains an L-shaped groove 51 having one leg 52 extending parallel to the axis of pin 48 and the other leg 53 extending at right angles thereto.
  • a stud 54 attached to the inner end of pin 48 slides in leg 52 when the pin is extended. Moving stud 54 into leg 53 locks pin 48 in its retracted position.
  • a pad member 56 is attached to the lower end of frame member 32.
  • Pad member 56 projects inwardly from the frame member and has a machined pad 58 on the upper side of its innermost corner.
  • the tool is used in establishing the ignition timing of a reciprocating internal combustion engine in the following manner.
  • Plate 20 is attached loosely to the front of the engine block and an operator slides cylindrical member 40 onto the exposed end of the engine crankshaft so that key 42 slides into crankshaft keyway 44, thereby locking the tool nonrotatably to the crankshaft.
  • pin 48 With pin 48 in a retracted position, the frame member 32 is rotated in a clockwise direction in FIG. 1 until pad 58 contacts engine block pan rail 16.
  • the dimensions of frame member 32 and pad member 56 are determined so that when pad 58 contacts the pan rail 16, the number one piston 14 of the engine is at its top dead center position.
  • Pin 48 is extended to slide into socket 30 of timing plate 20 and the timing plate then is fastened tightly to the engine block. Pin 48 then is retracted and locked in its retracted position by sliding stud 54 up into the leg 53 of slot 52. Frame member 32 is withdrawn fromthe engine which continues along the assembly line.
  • a vibration damper having at least one mark on its cylindrical surface is installed on the front of the crankshaft so the movement of the mark past the timing plate relative to the moment an ignition pulse is supplied to the number one cylinder can be sensed during subsequent dynamic engine timing.
  • this invention provides a tool that accurately and efliciently establishes the relationship of a timing plate to the piston position of reciprocating engines.
  • the timing plate subsequently can be used to determine dynamic ignition timing by a variety of techniques including the use of the conventional strobe light. Once the dimensions of the tool are established, it can be used to set timing plate position at any point on the assembly line after crankshaft installation.
  • abutment means on said frame member for contacting said engine block when said frame members and crankshaft rotation has moved said piston to a reference position
  • said engaging means comprises a cylindrical member fitting on an end of said engine crankshaft
  • a pin means on said frame member for positioning a timing plate on said engine block when said piston is in said reference position.
  • abutment means comprises a pad member for contacting a machined surface of said engine block when said piston is in said reference position.
  • the tool of claim 1 comprising spring means for spring loading said pin means toward an extended position where said pin means engages the timing plate and latch means for maintaining said pin means in a retracted position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US124082A 1971-03-15 1971-03-15 Tool for establishing ignition timing of a reciprocating internal combustion engine Expired - Lifetime US3691641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12408271A 1971-03-15 1971-03-15

Publications (1)

Publication Number Publication Date
US3691641A true US3691641A (en) 1972-09-19

Family

ID=22412656

Family Applications (1)

Application Number Title Priority Date Filing Date
US124082A Expired - Lifetime US3691641A (en) 1971-03-15 1971-03-15 Tool for establishing ignition timing of a reciprocating internal combustion engine

Country Status (7)

Country Link
US (1) US3691641A (esLanguage)
JP (1) JPS5245854B1 (esLanguage)
CA (1) CA950301A (esLanguage)
DE (1) DE2207592C2 (esLanguage)
FR (1) FR2129403A5 (esLanguage)
GB (1) GB1333192A (esLanguage)
IT (1) IT945035B (esLanguage)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858289A (en) * 1973-11-12 1975-01-07 Cross Co Method and means for automatically marking timing indicia on vehicle engines
US3889528A (en) * 1972-05-12 1975-06-17 Scans Associates Inc Method and apparatus for determining top dead center in internal combustion engines
US5533274A (en) * 1995-05-11 1996-07-09 Westling; John Gauge to measure proper positioning of starter motors on engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1410432A (en) * 1920-06-08 1922-03-21 Wallin Harry Walfred Gauging wrench
US1545458A (en) * 1922-12-15 1925-07-07 Teagle Company Ignition generator
US2426991A (en) * 1945-07-04 1947-09-09 Albert F Emrich Drafting-machine aligning tool
US3131484A (en) * 1962-01-23 1964-05-05 Federal Screw Works Gauging fixture for wheel bearings and the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1410432A (en) * 1920-06-08 1922-03-21 Wallin Harry Walfred Gauging wrench
US1545458A (en) * 1922-12-15 1925-07-07 Teagle Company Ignition generator
US2426991A (en) * 1945-07-04 1947-09-09 Albert F Emrich Drafting-machine aligning tool
US3131484A (en) * 1962-01-23 1964-05-05 Federal Screw Works Gauging fixture for wheel bearings and the like

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889528A (en) * 1972-05-12 1975-06-17 Scans Associates Inc Method and apparatus for determining top dead center in internal combustion engines
US3858289A (en) * 1973-11-12 1975-01-07 Cross Co Method and means for automatically marking timing indicia on vehicle engines
US5533274A (en) * 1995-05-11 1996-07-09 Westling; John Gauge to measure proper positioning of starter motors on engines

Also Published As

Publication number Publication date
GB1333192A (en) 1973-10-10
FR2129403A5 (esLanguage) 1972-10-27
CA950301A (en) 1974-07-02
DE2207592C2 (de) 1982-09-16
JPS5245854B1 (esLanguage) 1977-11-18
DE2207592A1 (de) 1973-08-02
IT945035B (it) 1973-05-10
AU3519471A (en) 1973-05-10

Similar Documents

Publication Publication Date Title
ES2115770T3 (es) Un metodo y un dispositivo para cambiar la relacion de compresion en un motor de combustion interna.
SE386957B (sv) Anordning for forbettring av blandningsbildningen i en forbrenningsmotors spec en dieselmotors cylindrar
US5459940A (en) Apparatus and process for determining top dead center of a piston and crank shaft in an internal combustion engine
FR2216476B1 (esLanguage)
US3691641A (en) Tool for establishing ignition timing of a reciprocating internal combustion engine
ATA715375A (de) Brennkraftmaschine, insbesondere dieselmaschine
FR2327407A1 (fr) Piston pour moteur a combustion interne, particulierement moteur diesel
DD127727A1 (de) Zylinderkopf fuer brennkraftmaschinen,insbesondere dieselmotoren
US3765098A (en) Apparatus for measuring piston position
SE7707941L (sv) Motortest
US3857086A (en) Process for establishing ignition timing of a reciprocating internal combustion engine
FR2328109A1 (fr) Soupape, notamment pour moteurs a combustion interne a pistons, tels que les moteurs diesel
BR7605105A (pt) Motor de combustao interna com um dispositivo para compensacao de pressao no carter do eixo manivela
IT941832B (it) Trasduttore di segnali per la libe razione di segnali elettrici in dipendenza dalla posizione di una parte mobile in particolare di un pistone in un cilindro di una mac china a combustione interna
ES454001A1 (es) Aparato de bombeo de combustible para suministrar combusti- ble a los motores de combustion interna.
CN210650363U (zh) 一种基于带喷油嘴的铝活塞加工防错夹具
US2730066A (en) Timing and tappet setting indicator having a remote dial
US2920602A (en) Ignition timing method and apparatus for aircraft internal combustion engines
GB538837A (en) Improvements in and relating to holders and tools for assembling and dismantling thefuel pumps of diesel engines and the like
GB744821A (en) Improvements relating to variable throw cranks
US1442102A (en) Aligner for engine pistons
US2541318A (en) Piston aligning mechanism
JPS5335811A (en) Cylinder head for reciprocating piston internal combustion engine
JPS53147121A (en) Device of preventing vibration of cylinder liner in internal combustion engine
GB1413925A (en) Clamping-lever fastening