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Publication numberUS3786792 A
Publication typeGrant
Publication dateJan 22, 1974
Filing dateMay 28, 1971
Priority dateMay 28, 1971
Publication numberUS 3786792 A, US 3786792A, US-A-3786792, US3786792 A, US3786792A
InventorsR Gibson, J Greathouse, F Pekar, W Pelizzoni
Original AssigneeMack Trucks
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Variable valve timing system
US 3786792 A
Abstract
A system for varying the valve timing of an internal combustion engine to increase the retarding effect of the engine for braking purposes, to increase the compression ratio of a relatively low compression ratio engine to enhance starting, and to optimize breathing to improve the engine performance over the useful operating speed range. The valve timing is varied by changing the total valve train length so as to shift the points on the cam profile at which the valve opening and closing events are determined.
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United States Patent [1 1 Pelizzoni et al.

[ .Ian. 22, 1974 VARIABLE VALVE TIMING SYSTEM [75] Inventors: Winton J. Pelizzoni; Jack F.

. Greathouse; Frank J. Pekar, Jr.;

Richard B. Gibson, all of Hagerstown, Md.

[52] US. Cl. 123/97 B, 123/9016, 123/9017 [51] Int. Cl. F02d 13/04 [58] Field of Search 123/9016, 90.15, 97 B [56] References Cited UNITED STATES PATENTS 3,361,122 l/l968 Wagner 123/9016 3,304,925 2/1967 Rhoads 123/9016 3,385,274 5/1968 Shunta l23/90.l6 3,490,423 l/l970 Shunta 123/9016 3,641,988 2/1972 Torazza 123/9016 3,367,312 2/1968 Jonsson 123/9016 3,234,923 2/1966 Fleck 123/97' B 3,572,300 2/1969 Stager.... 123/97 B 3,426,523 2/1969 Straub 123/97 B SERVICE BRAKE FULL ON 5g; AIR T0 BRAKES AIR VALVE AIR FROM 3 nessnvom FUEL mazcnou PUMP BRAKE PEDAL SERVICE BRAKE START 3,547,087 12 1970 Siegler 123 97 B 3,439,661 4/1969 Weiler 123 97 B OTHER PUBLICATIONS Fuel Injection and Controls for Internal Combustion Engines, by Burman & DeLuca, 1962, pages 176177 Primary Examiner-Laurence M. Goodridge Assistant Examiner-Ronald B. Cox

Attorney, Agent, or Firm-Brumbaugh, Graves, Donohue & Raymond [57] ABSTRACT A system for varying the valve timing of an internal combustion engine to increase the retarding effect of the engine for braking purposes, to increase the compression ratio of a relatively low compression ratio engine to enhance starting, and to optimize breathing to improve the engine performance over the useful operating speed range. The valve timing is varied by changing the total valve train length so as to shift the points on the cam profile at which the valve opening and closing events are determined.

36 Claims, 36 Drawing Figures FATENTED JAN 2 2 I974 3.786.792 SHEET 010F 21 MOTORING COMPRESSION AND EXPANSION uJ O: 3 (0 LL] Lt 3! INTAKE VOLUME l l I x3 MOTORING F/G Ir ENG'INE BRAKING EXHAUST VALVE OPENED COMPRESSION I; EXPANSION INTO THE g EXHAUST MANIFOLD M E 0: CL,

INTAKE INVENTORS. VOLUME WINTON J. PELIZZONI,

JACK F. GREATHOUSE, BY FRANK J. PEKAR,JR. BI

RICHARD B. GIBSON I h e I r A TTORNEYS.

PATENTED AIIZB m4 3. 786, 792 SHEET 02 [If 21 CYLINDER PRESSURE I EXHAUST VALVE; 3'9

I ENGINE BRAKE ON I E INLET T VALVE .3 LLI I EXHAUST VALVE -ENGINE\\ BRAKE OFF I I I I I l I I I I I I INTAKE COMPRESSION POWER EXHAUST INVENTORS. WINTON' J. PELIZZONI, JACK F. 'GREATHOUSE, BY FRANK J. PEKAR'JRBI RICHARD a. GIBSON SCHEMATIC OE 4 STROKE CYCLE EVENTS WITH COMPRESSION BRAKING VALVE ACTION PATENTEDJAN 22 m4 SHEEI UH 0F 21 CAB SWITCH SERVICE BRAKE START SERVICE BRAKE FULL em AIR TO BRAKES AIR VALVE RESERVOIR INVENTORS. I WINTON J. mauzzom JACK F. GREATHOUSE,

y FRANK .1. PEKAR, JR. 8 RICHARD B. meson A from/5Y5.

PATENTEUJAN 22 m4 HORSEPOWER mm user 211 BRAKE 8 FR/GT/O/V HORSEPOWER v BRAKE HORSEPOWER TORQUE LBS TWO CYL. HEADS (4 CYLS.) OPERATING THREE CYL. HEADS (6 CYLS.) I26 ENGINE BRAKE (FULL) (8 CYLS.)

I i I l 1 ENGINE FRICTION I000 I200 I400 I600 I800 2000 2200 2400 2600 ENGINE RPM WINTON JACK F. GREATHOUSE BY FRANK .1.

RICHARD A r TOR/VE rs.

their I N VEN TORS.

J PELIZ 2 ON I,

PE KAR, JR. 5. GIBSON snzit PATENTEHmzz m4 PATENTEDJAfi 2 2 1974 mm mar 21 I NVEN TORS WINTON J. PELIZZONI, JACK F. GREATHOUSE BY FRANK J. PEKAR, JR. 8|

RICHARD B. GIBSON 'bcmur 49 4" inr u r ymnl their ATTORNEYS.

PATENTEU JAN 2 2 I974 I 3.786.792 sIIEIII osur 2'I i CAB SWITCH I INJECTION BATTERY r PUMP U SWITCH ENGINE I00 BRAKE ON '86 I T 37 sERvICE BRAKE sTART%:: SOLENOIDSI SERVICE BRAKE FULL ON 85' as F/G. HA

C B SWITCH 37 NJECTIoN BATTERY 4r PUMP SOLENOIDS V SWITCH 85 I I00 L 38 F l6. //5

I04 SHIFT LEVER I02 87 CAB SWITCH wn- I INJECTIoN I I BATTERY PUMP SOLENOIDS SWITCH CAB SWITCH W E 87 A INJECTION- I BATTERY -1 PUMP SOLENOIDS V V SWITCH I00 264 i J85 88 F/G. l/D INVENTORS. WINTON J. PELIZZONI, JACK F. GREATHOUSE, Y FRAN J. PEKAR, JR.&

RICH D B. GIBSON. BM 4&-,M*

their ATTORNEYS.

PATENTEDJMIZZISN 3,786,792

' sum 10 P T1 I04 BRAKE PEDAL 272 94 SERVICE BRAKE 50 I48 274 START SERVICE BRAKE II FULL ON -k AIR TO BRAKES fi 5 "Ki- 3 L 72 CAB SWITCH V I n 11" A I "A H 78 I v I02 ELISE ,F--\. r v

' ma I 6 l I M:

1 W. 58 "*60 l ill T 59 l/ 42 I I A K A! 56\ 161- F/GJ I INVENTORS. WINTON J. PELIZZONI JACK F. GREATHOUSE,

BY FRANK J. PEKAR, JR. 8-

RICHARD B. GIBSON BQUMJM M vW their ATTORNEYS.

Pmmmmzelw 3.786.792 mm 1m 2w 7 INVENTO WINT J. PELIZZ I,

JACK GREATHOUSE, BY FRANK J. PEKAR, JR.&

RICHARD B. GIBSON their ATTORNEYS.

PATENIEW 9 3, 7 86, 7' 9 2 sum no; 21

CYLINDER E 1 gi PRESSURE 5:; 3L- E COMPRESSIQN EXPANSION INLET VALVE CLEARANCE 7 0 SET TO PERMIT CLOSING NORMAL INLET VALVE AT BOTTOM CENTER CLEARANCE CLEARANCE VOLUME CLEARANCE VOLUME m9 340 mfg 2 M 55 1 2 {Zen E u 2 0w 3 E m .1 o mu. m? 2 3 ""339 3 I MI ass/I POSITION OF CRANK, CONNECTING ROD POSITION OF CRANK, CONNECTING ROD AND PIETON WHEN INLET VALVE CLOSES AND PISTON WHEN INLET VALVE NOFIMALLY CLOSES AT BOTTOM CENTER INVENTORS. j V F/ WINTON J. PELIZZONI, JACK F. GREATHOUSE,

BY FRANK J. PEKAR, JR. & RICHARD B. GIBSON Iheir ATTORNEYS.

PMEMED M 2 I 7 3 7' 86 f 9 2 sum. 1M! 21 CAB SWITCH THROTTLE LIMITING SOLENOID 76 /85 FUEL 82 INJECTION 383: 373

- m 55 l T 5 q 6 I I62 =i=-*.E

w i INVENTORS, WINTQN J. PELIZZONI,

JACK F. GREATHOUSE, FRANK J. PEKAR, JR. 5

RICHARD B. GIBSON.

their ATTORNEYS.

PATENIEBJAH 22 1974 MN 15 0F 2? I N VENTORS WINTON J. PELIZZONI, JACK F. GREATHOUSE, BY FRANK J. PEKAR, JR. a

RICHARD GIBSON their ATTORNEYS.

BRAKE PEDAL I02 SWITCHES CAB SWITCH INJECTION PUMP SWITCH I -l0fl BATTERY CAB SWITCH THROTTLE LIMITING SOLENOID GINE a VARYING BRAKING COMPRESSION RATIO 3 E LOW SPEED +IIGI-I SPEED g VALVE TIMING I VALVE TIMING I I RPM SPEED AT WHICH p VALVE TIMING INVbNIORS- SHIFTED I wINToN II. PELIZZONI,

JACK F. GREATHOUSE, BY FRANK J. PEKAR, JR. HI RICHARD B. GIBSON their ATTORNEYS.

PATENTEDJANZZ m4 3,786, 7 9 2 MN 17% m EXHAUST 76 INLET ROCKER ARM ROCKER ARM I j If I q AK A 190 34 g]: ist-' m 420 407 11 OTL 405 UNDER 76. IPRESSURE 2 i p M- 1 BRAKE swfigfiis 93 IUZ INJECTION PUMP SWITCH CAB SW'TCH WINTON A THROTTLE BY l m J 1%;??? a BATTERY A LIMITING RICHARD a. GIBSON I V SOLENOID 4 385 392 their ATTORNEYS.

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Reference
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Classifications
U.S. Classification123/321, 123/90.17, 123/90.16
International ClassificationF01L13/04, F01L1/24, F01L1/245, F01L13/08, F01L1/20, F01L13/06, F01L13/00
Cooperative ClassificationF01L13/0031, F01L13/04, F01L1/2422, F01L13/06, F01L1/08, F01L13/08, F01L1/245
European ClassificationF01L1/245, F01L13/06, F01L13/00D4, F01L13/04, F01L13/08, F01L1/24F
Legal Events
DateCodeEventDescription
Jul 10, 1991ASAssignment
Owner name: MACK TRUCKS, INC., A CORP. OF PA, PENNSYLVANIA
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITIBANK, N.A.;REEL/FRAME:005755/0505
Effective date: 19910628
Apr 27, 1990ASAssignment
Owner name: CITIBANK N.A., NEW YORK
Free format text: SECURITY INTEREST;ASSIGNOR:MACK TRUCKS, INC.;REEL/FRAME:005287/0586
Effective date: 19900427
Apr 27, 1990AS06Security interest
Owner name: CITIBANK N.A., 399 PARK AVENUE, NEW YORK, NY 10043
Owner name: MACK TRUCKS, INC.
Effective date: 19900427