US3854461A - Vacuum units - Google Patents

Vacuum units Download PDF

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Publication number
US3854461A
US3854461A US00323362A US32336273A US3854461A US 3854461 A US3854461 A US 3854461A US 00323362 A US00323362 A US 00323362A US 32336273 A US32336273 A US 32336273A US 3854461 A US3854461 A US 3854461A
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US
United States
Prior art keywords
distributor
bracket
casing
cap
unit
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
US00323362A
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English (en)
Inventor
N Jukes
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Application granted granted Critical
Publication of US3854461A publication Critical patent/US3854461A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • 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
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/05—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means
    • F02P5/10—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means dependent on fluid pressure in engine, e.g. combustion-air pressure
    • F02P5/103—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using mechanical means dependent on fluid pressure in engine, e.g. combustion-air pressure dependent on the combustion-air pressure in engine

Definitions

  • a vacuum unit for an ignition distributor includes a housing which is divided internally into first and second chambers by a diaphragm.
  • a connecting link for attachment at one end to the timing plate of the ignition distributor is connected at its other end to the diaphragm so as to move therewith.
  • Secured to the housing of the unit is a bracket whereby the unit can be secured in position on the casing of the ignition distributor and the bracket is provided with a locating member.
  • the locating member In use the locating member is engaged by the detachable insulating cap of the distributor, and so serves to locate the cap angularly in the desired position relative to the distributor casing.
  • the connecting link is provided at said one end with means whereby the connecting link is coupled to the timing plate.
  • Said connecting means is provided on the link by a shaping operation, and the position of said means is determined using the location member of the bracket as a reference point.
  • This invention relates to vacuum units for internal combustion engine spark; ignition system ignition; distributors and to a method of manufacturing such units.
  • a vacuum unit includes a housing divided internally into first and second chambers by a diaphragm, a connecting link secured at one end to the diaphragm and extending from the first chamber for connection, in use, to the timing plate of an ignition distributor, and a bracket secured to the housing and whereby the unit can be secured in position on the casing of an ignition distributor, the bracket being provided with a locating member engageable, in use, by the detachable insulating cap of the distributor, so as to locate the cap angularly in the desired position on the distributor casing.
  • the bracket is so shaped as to permit two alternative positions of the unit relative to the casing of the distributor, one position providing clockwise rotation of the timing plate of the distributor as the connecting link is withdrawnby the unitin use, and the second position. providing anti-clockwise rotation of the timing plate as the connecting link is withdrawn in use, the bracket being provided with a 'pair of location members for the distributor cap one of the pair being operative in said one'position of the bracket and the other of the pair being operative in the second position of the bracket.
  • bracket is detachably secured to the distriburor casing by means of screws.
  • the invention further resides in a method of manufacturing a vacuum unit including a housing divided internally into first andsecond chambers by a diaphragm,
  • FIG. 1 is a perspective view of an ignition distributor with parts thereof omitted for clarity
  • FIG. 2 is a sectional view of the vacuum unit shown in FIG. 1, and
  • HO. 3 is a view in the direction of arrow A in FIG. 2.
  • the ignition distributor includes a hollow metal casing 11 within which is journalled a 'cam shaft (not shown). Supported within the casing is a contact breaker assembly (not shown) part of which is angularly movable about the axis of the cam shaft in the usual manner to effect alteration in the ignition timing of the distributor.
  • a contact breaker assembly (not shown) part of which is angularly movable about the axis of the cam shaft in the usual manner to effect alteration in the ignition timing of the distributor.
  • Engageable with the casing 11 of the distributor is an insulating cap 12 which when in position closes the casing 11, and which carries a centrally disposed high tension input terminal 13 and a plurality of generally equi-angularly spaced high tension output terminals 14.
  • the cam shaft carries at its upper end a rotor arm which is permanently electrically connected to the input high tension terminal 13, and which rotates with the cam shaft of the distributor todistribute high tension sparking pulses to the output terminals 14
  • a vacuumunit 15 Secured to the casing 11 is a vacuumunit 15 which controls adjustment of the angular position of the contact breaker assembly of the distributor in the usual ing link means whereby the link can be coupled to the distributor timing plate in use, the shaping operation being performed after assembly of the unit and the position, on the link, at which said means is provided being determined utilizing the location member of the bracket as'a reference point.
  • said means is a hole in the link through which in use a pin extends to connect the link to the distributor timing plate.
  • the invention resides in an ignition distributor for use in the spark ignition system of an internal combustion engine, the distributor including, a hollow casing, a contact breaker assembly mounted for angular adjustment within the casing, a vacuum unit secured to the casing, through the intermediary of a bracket, the unit including a connecting link connecting a diaphragm of the unit to said contact breaker assembly, and an insulating cap closing said casing and carrying high tension terminals of the distributor, the bracket of the vacuum unit being provided with a location member which mates with the insulating cap to locate the cap angularly with respect to the casing.
  • the periphery of the casing which engages the cap is unbroken as permitted by the provision of the cap location on the bracket.
  • a flexible diaphragm 17 which divides the housing internally into first and second chambers.
  • a connecting link 18 Secured to the diaphragm l7, and extending through the wall of the first chamber is a connecting link 18, and positioned within the second chamber and also secured to the diaphragm is a plunger 19.
  • a spring 21 Acting between the diaphragm l7 and the wall of the second chamber is a spring 21 which urges the diaphragm 17 to move in a direction to reduce the volume of the first chamber.
  • a connecting union 22 is provided on the wall of the second chamber whereby the second chamber can be placed in communication with a source of vacuum.
  • the first chamber is open to atmosphere, and so as the pressure within the second chamber is reduced then the diaphragm 17 and accordingly the plunger 19 and connecting link 18 are moved against the action of the spring 21.
  • the mounting bracket 23 is also formed as a metal pressing, and is shaped to engage the cylindrical outer surface of the casing 11 of the distributor.
  • the casing of the distributor is provided with an aperture through which the connecting link 18 extends, and at its ends the bracket 23 is provided with holes 24 for the reception of fixing screws.
  • the con-- necting link 18 is provided adjacent its free end with a pierced hole 25 through which, in use, extends a pin carried by the movable part of the contact breaker assembly.
  • the connecting link 18 couples the diaphragm 17 of the vacuum unit to the movable part of the contact breaker assembly, so that as the diaphragm l7 moves in accordance with fluctuations in pressure in the second chamber of the unit.l5 then the contact breaker assembly is moved angularly to adjust the ignition timing of the distributor in accordance with the pressure fluctuations.
  • the conventional manner the
  • second chamber of the vacuum unit communicates with the inlet manifold of the internal combustion engine utilising the ignition distributor.
  • the bracket 23 is shaped to engage the cylindrical outer surface of the casing 11.
  • the axis of the vacuum unit is not radially disposed with respect to the curvature of the bracket 23, and so the connecting link l8 extends within the casing 11 of the distributor adjacent the inner wall of the casing.
  • the vacuum unit can be engaged in two alternative positions with the casing 11. Considering the distributor in plan view, the vacuum unit 15 can be engaged in a first position so that withdrawal of the connecting link moves the contact breaker assembly clockwise (FIG. 1) and alternatively, by rotating for.
  • the bracket 23 is provided with an upstanding locating member 26 which projects upwardly, and which is received in a corresponding recess 27 in the inner wall of the cap 12.
  • the casing 11 is provided with a circumferential shoulder 11a and an upstanding wall 11b having an external diameter substantially equal to the internal diameter of the cap 12. Since the locating member 26 is provided on the bracket 23 then the shoulder 11a and the wall 11b can be unbroken, so enhancing the resistance of the junction between the cap and the casing, to ingress of contaminants.
  • bracket 23 Since the bracket 23 is arranged, as described above to provide two alternative mounting arrangements, then the bracket 23 is formed with a second locating member 28 which is not in use, in the arrangement shown in FIG. 1. However, it is to be appreciated that in an anti-clockwise distributor the location member 28 it would engage the cap 12 and the location member 26 would not be in use.
  • the free end of the connecting link 18 is left plain.
  • the hole 25 is pierced in the end of the connecting link 18.
  • the piercing operation is the last operation which is performed on the vacuum unit. and the position of the hole 25 in the link 18 is determined using the location member 26 as a fixed reference point.
  • the hole 25 is pierced in the connecting link 18 at a predetermined distance from the locating member 26 with the diaphragm 17 in its rest position, and so tolerances involved in the manufacture of the vacuum unit are not incorporated in the positioning of the hole 25 in relation to the locating member 26.
  • This feature is of particular importance in that it minimises the build up of tolerance errors within the ignition distributor. Since the hole 25 and the locating member 26 are accurately positioned with respect to one another, then the cap 12 and of course the terminals 14 of the cap 12, will be accurately positioned relative to the hole 25. The hole, as previously described, receives a pin whereby the connecting link 18 is coupled to the contact breaker assembly of the distributor and so the cam follower of the contact breaker assembly will accurately be positioned relative to the terminals 14.
  • the cam shaft of the distributor engages the cam follower and at certain points known conveniently as break points the cam causes the contacts of the contact breaker assembly to open thereby causing generation of a sparking pulse which is supplied by way of the terminal 13 of the cap 12 to the movable high tension electrode of a rotor arm carried by the cam shaft.
  • the path of rotation of the electrode as the cam shaft rotates takes the electrode close to the terminals 14 in turn.
  • a sparking pulse is generated it is conducted by the electrode to the nearest terminal at that instant and it will be appreciated that conventional distributorshave sufficient accuracy to ensure that the terminals 14 receive sparking pulses in the desired sequence.
  • the electrode of the rotor arm requires to have a relatively large arcuate length and also to avoid the possibility of distribution of the pulse to the wrong terminal 14, the angular spacing between the terminals 14 is relatively large thus necessitating a cap of large diameter.
  • the heel of the contact breaker assembly is positioned relative to the terminals 14 with minimal inaccuracy owing to tolerances, and since the rotor arm is carried by the cam shaft, the electrode thereof is positioned accurately relative to the break point of the cam shaft.
  • the overall accuracy of the distributor is increased in such a manner that the necessary arcuate length of the rotor electrode is reduced and the spacing needed between the terminals 14 is also reduced, the reduction in terminal spacing leading to a reduction in the necessary diameter of the cap 12.
  • the housing 16 and bracket23 of the vacuum unit described above are formed from metal pressings. However, it is to be appreciated that these components can be formed also by die-casting techniques. Moreover, the arrangement has been described as being secured to the casing of the distributor by a pair of screws. It is to be appreciated that other securing means can be provided, and in an arrangement where it is not desired to provide the facility of replacing the vacuum unit then the bracket 23 could be welded or otherwise permanently secured to the casing.
  • Onescrew will provide the plate location in an anticlockwise distributor and the other screw will provide the location in a clockwise distributor.
  • a vacuum unit (as claimed in claim 1 wherein), for an ignition distributor, including a housing divided internally into first and second-chambers by a diaphragm, a connecting link secured at one end to the diaphragm and extending from the first chamber for connection, in use, to the timing plate of an ignition distributor, and a bracket secured to the housing and whereby the unit can be secured in position on the casing of an ignition distributor, the bracket (is) being so shaped as to permit two alternative positions of the unit relative to the casing of the distributor, one position providing clockwise rotation of the timing plate of the distributor as the connecting link is withdrawn by the unit in use, and the second position providng anti-clockwise rotation of the timing plate as the connecting link is withdrawn in use, the bracket being provided with a pair of location members one or other of which is engageable, in use, by the detachable insulating cap of the distributor so as to locate the cap angularly in the desired position on the distributor casing, (for the distributor cap) oneof the pair being
  • An ignition distributor including a hollow casing, a contact breaker assembly mounted for angular movement within the casing, a vacuum unit secured to the casing through the intermediary of a bracket the unit including a connecting link connecting a diaphragm of the unit to said contact breaker assembly, and an insu' lating cap closing said casing and carrying high tension terminals of the distributor, the bracket of the vacuum unit being (provided with a location member which mates with the insulating cap to locate the cap angularly with respect to the casing.) so shaped as to permit two alternative positions of the unit relative to the casing of the distributor, one position providing clockwise rotation of the timing plate of the distributor as the connecting link is withdrawn by the unit in use, and the second position providing anti-clockwise rotation of the timing plate as the connecting link is withdrawn in use, the bracket including a pair of location members one or other of which is engaged with said insulating cap of the distributor so as to locate the cap angularly in the desired position on the distributor casing, one of said pair of location

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Measuring Fluid Pressure (AREA)
US00323362A 1972-01-15 1973-01-15 Vacuum units Expired - Lifetime US3854461A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB204572*[A GB1409919A (en) 1972-01-15 1972-01-15 Vacuum units for ignition distributors

Publications (1)

Publication Number Publication Date
US3854461A true US3854461A (en) 1974-12-17

Family

ID=9732648

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323362A Expired - Lifetime US3854461A (en) 1972-01-15 1973-01-15 Vacuum units

Country Status (18)

Country Link
US (1) US3854461A (enrdf_load_stackoverflow)
JP (1) JPS5136402B2 (enrdf_load_stackoverflow)
AR (1) AR210236A1 (enrdf_load_stackoverflow)
AU (1) AU468539B2 (enrdf_load_stackoverflow)
BR (1) BR7300330D0 (enrdf_load_stackoverflow)
CS (1) CS168621B2 (enrdf_load_stackoverflow)
DD (1) DD103693A5 (enrdf_load_stackoverflow)
DE (1) DE2301677C3 (enrdf_load_stackoverflow)
ES (2) ES410639A1 (enrdf_load_stackoverflow)
FR (1) FR2168780A5 (enrdf_load_stackoverflow)
GB (1) GB1409919A (enrdf_load_stackoverflow)
HU (1) HU166122B (enrdf_load_stackoverflow)
IN (1) IN137516B (enrdf_load_stackoverflow)
IT (1) IT976850B (enrdf_load_stackoverflow)
PL (1) PL84936B1 (enrdf_load_stackoverflow)
SU (1) SU502612A3 (enrdf_load_stackoverflow)
YU (1) YU35799B (enrdf_load_stackoverflow)
ZA (1) ZA73247B (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341622Y2 (enrdf_load_stackoverflow) * 1975-06-05 1978-10-06
FR2358563A1 (fr) * 1976-07-15 1978-02-10 Ducellier & Cie Perfectionnements aux capsules a depression pour distributeur d'allumage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508851A (en) * 1946-08-31 1950-05-23 California Machinery And Suppl Auxiliary venturi vacuum adapter for vacuum controlled spark advance
US3162184A (en) * 1962-07-20 1964-12-22 Walker Brooks Spark timing control
US3306272A (en) * 1965-04-01 1967-02-28 Motorola Inc Vacuum servo advance mechanism
US3399657A (en) * 1966-01-14 1968-09-03 Sev Marchal Combustion engine ignition
US3575150A (en) * 1968-07-12 1971-04-20 Ducellier & Cie Ignition distributor for internal combustion engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE679499C (de) * 1937-11-02 1939-08-07 Bosch Gmbh Robert Zuendverteiler
DE684396C (de) * 1938-03-22 1939-11-27 Bosch Gmbh Robert Zuendverteiler
DE1242411B (de) * 1965-01-22 1967-06-15 Bosch Gmbh Robert Verfahren zum Einstellen der Federvorspannung bei Unterdruckzuendverstellern fuer Brennkraftmaschinen
FR1566469A (enrdf_load_stackoverflow) * 1968-03-04 1969-05-09

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508851A (en) * 1946-08-31 1950-05-23 California Machinery And Suppl Auxiliary venturi vacuum adapter for vacuum controlled spark advance
US3162184A (en) * 1962-07-20 1964-12-22 Walker Brooks Spark timing control
US3306272A (en) * 1965-04-01 1967-02-28 Motorola Inc Vacuum servo advance mechanism
US3399657A (en) * 1966-01-14 1968-09-03 Sev Marchal Combustion engine ignition
US3575150A (en) * 1968-07-12 1971-04-20 Ducellier & Cie Ignition distributor for internal combustion engines

Also Published As

Publication number Publication date
JPS4878338A (enrdf_load_stackoverflow) 1973-10-20
YU9973A (en) 1980-09-25
ZA73247B (en) 1973-10-31
DE2301677B2 (de) 1980-07-03
DD103693A5 (enrdf_load_stackoverflow) 1974-02-05
PL84936B1 (enrdf_load_stackoverflow) 1976-04-30
DE2301677C3 (de) 1981-03-26
JPS5136402B2 (enrdf_load_stackoverflow) 1976-10-08
BR7300330D0 (pt) 1973-09-27
CS168621B2 (enrdf_load_stackoverflow) 1976-06-29
DE2301677A1 (de) 1973-07-19
AU5077773A (en) 1974-07-11
GB1409919A (en) 1975-10-15
SU502612A3 (ru) 1976-02-05
ES410639A1 (es) 1976-04-01
ES438038A1 (es) 1977-03-01
IN137516B (enrdf_load_stackoverflow) 1975-08-09
YU35799B (en) 1981-06-30
AR210236A1 (es) 1977-07-15
FR2168780A5 (enrdf_load_stackoverflow) 1973-08-31
IT976850B (it) 1974-09-10
AU468539B2 (en) 1976-01-15
HU166122B (enrdf_load_stackoverflow) 1975-01-28

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