US3924586A - Vacuum control assembly - Google Patents

Vacuum control assembly Download PDF

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Publication number
US3924586A
US3924586A US356724A US35672473A US3924586A US 3924586 A US3924586 A US 3924586A US 356724 A US356724 A US 356724A US 35672473 A US35672473 A US 35672473A US 3924586 A US3924586 A US 3924586A
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United States
Prior art keywords
vacuum
operating
diaphragm
end portion
operating rod
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
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US356724A
Inventor
Clarence L Julian
Robert E Young
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Motors Liquidation Co
Original Assignee
Motors Liquidation 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 Motors Liquidation Co filed Critical Motors Liquidation Co
Priority to US356724A priority Critical patent/US3924586A/en
Priority to CA191,551A priority patent/CA1003286A/en
Priority to GB1815474A priority patent/GB1432915A/en
Priority to FR7415400A priority patent/FR2228161B1/fr
Publication of USB356724I5 publication Critical patent/USB356724I5/en
Application granted granted Critical
Publication of US3924586A publication Critical patent/US3924586A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • ABSTRACT A vacuum control assembly for operating the breaker plate of an automotive type ignition distributor through an operating rod to provide ignition spark vacuum advance for an associated internal combustion engine.
  • a range bracket member having an elongated slot of a length determined by the desired range of degrees of ignition spark advance is rigidly secured to the assembly mounting bracket in a location at which the slot accommodates the end portion of the operating rod which engages the distributor breaker plate and is so positioned that one end wall of the slot engages the operating end portion at the point at which the operating end portion is located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
  • This invention is directed to a vacuum control assembly for operating the breaker plate of an automotive type ignition distributor through an operating rod to provide ignition spark vacuum advance for an associated internal combustion engine and, more specifically, to a vacuum control assembly of this type having a range bracket member which positions the operating rod at the location at which it should be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
  • the breaker plate of an automotive type ignition distributor is operated by a vacuum control assembly which is usually mounted upon or close to the ignition distributor.
  • the vacuum control assembly includes a diaphragm which is coupled to the breaker plate of the ignition distributor through an operating rod having an elongated portion secured to the diaphragm and an operating end portion extending substantially normal to the elongated portion for operatively engaging the breaker plate. Therefore, the vacuum control assembly changes the angular position of the breaker plate in response to a change of engine vacuum to which one side of the diaphragm is exposed.
  • the diaphragm forms a seal at one side of a vacuum chamber which is in communication with the intake manifold of the associated internal combustion engine and the vacuum chamber accommodates a compression spring which opposes the pressure of ambient air against the exposed opposite side of the diaphragm.
  • a compression spring which opposes the pressure of ambient air against the exposed opposite side of the diaphragm.
  • the point at which ignition spark advance is to be inititiated may vary within the range of plus or minus one inch of mercury or plus or minus 3 of crankshaft rotation. It has been found that it is much more desirable to initiate spark vacuum advance at the precise magnitude of engine vacuum at which ignition spark advance should be initiated.
  • a vacuum control assembly for operating the breaker plate of an automotive type ignition distributor is provided wherein a range bracket member is so positioned that the operating rod which revolves the ignition distributor breaker plate is precisely located at the point at which it is to be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
  • FIG. 1 is a top view of a vacuum control assembly of this invention.
  • FIG. 2 is a sectional view of FIG. 1 taken along line 22 and looking in the direction of the arrows.
  • the vacuum control assem' bly of this invention includes a casing consisting of a chamber member 11 and a cover member 14, a diaphragm 12 enclosed within casing 10 and a compression spring 15 interposed between diaphragm 12 and casing 10 for urging diaphragm 12 in a first direction toward the left as looking at the drawing.
  • Diaphragm 12 is hermetically sealed to chamber member 11 of casing 10 about the periphery thereof to provide a vacuum chamber 16.
  • a vacuum port 18 is in communication with the inside of casing member 10.
  • the side of diaphragm 12 opposite compression spring 15 is exposed to atmosphere, as is well known in the art.
  • An operating rod having an elongated portion 20 secured to the diaphragm member 12 as at 21 and an operating end por tion 22 extending substantially normal to the elongated portion 20 for operatively engaging the breaker plate is oscillated linearly by diaphragm member 12.
  • a mounting bracket 25 is rigidly secured to the cover member 14 of casing member 10 and extends in a direction along operating rod 20 for mounting the vacuum control assembly upon or near the ignition distributor in a position at which the operating end portion 22 operatively engages the distributor breaker plate.
  • a range bracket member having an elongated slot 31 of a length determined by the desired range of degrees of ignition spark vacuum advance from zero to maximum is rigidly secured to mounting bracket 25 in a location at which slot 31 accommodates the operating end portion 22 of the operating rod and is so positioned that one end wall 31a of slot 31 engages the operating end portion 22 at the point at which the operating end portion 22 is located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
  • vacuum port 18 is exposed to a constant vacuum of a magnitude equal to the magnitude of engine vacuum at which ignition spark vacuum advance is to be initiated in the associated engine with which the vacuum control assembly is to be used, for example 4" of mercury. This vacuum is maintained until the range bracket member 30 is rigidly secured to mounting bracket 25, as by spot welds 34 and 35 for example, at a location at which end wall 31a of slot 31 thereof is in engagement with the operating end portion 22. Consequently, when vacuum is removed from port 18 and the unit assumes its relaxed position, the operating end portion 22 of the operating rod is precisely located for every one of the vacuum control assemblies at the point at which it should be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
  • slot 31 of range bracket member 30 is designed to be of a length which will provide ignition spark vacuum ad vance only between 0 and the maximum number of degrees.
  • a vacuum control assembly for operating the breaker plate of an automotive type ignition distributor to provide ignition spark vacuum advance for an associated internal combustion engine comprising, a vacuum unit including at least a casing, a diaphragm enclosed within said casing in such a manner as to provide a vacuum chamber, a spring interposed between said diaphragm and said casing for urging said diaphragm in a first direction, a vacuum port communicating with said vacuum chamber and an operating rod oscillated 1 4 linearly by said diaphragm having an elongated portion secured to said diaphragm and an operating end portion extending substantially normal to said elongated portion for operatively engaging said breaker plate, a mounting bracket rigidly secured to said casing and extending in a direction along said operating rod, and a range bracket member having an elongated slot of a length determined by the desired range of degrees of ignition spark vacuum advance from zero to maximum which accommodates said operating end portion of said operating rod, said range bracket member, with a predetermined vacuum applied to said vacuum port,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

A vacuum control assembly for operating the breaker plate of an automotive type ignition distributor through an operating rod to provide ignition spark vacuum advance for an associated internal combustion engine. A range bracket member having an elongated slot of a length determined by the desired range of degrees of ignition spark advance is rigidly secured to the assembly mounting bracket in a location at which the slot accommodates the end portion of the operating rod which engages the distributor breaker plate and is so positioned that one end wall of the slot engages the operating end portion at the point at which the operating end portion is located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.

Description

Julian et a1.
[ Dec. 9, 1975 VACUUM CONTROL ASSEMBLY [75] Inventors: Clarence L. Julian, Daleville; Robert E. Young, Anderson, both of Ind.
[73] Assignee: General Motors Corporation,
Detroit, Mich.
22 Filed: May3, 1973 21 Appl. No.: 356,724
[44] Published under the Trial Voluntary Protest Program on January 28, 1975 as document no.
[52] US. Cl. 123/117 A; 123/1465 A [51] Int. Cl. F021 5/04 [58] Field of Search 123/117 A, 146.5 A; 92/13, 92/13.2, 99, 100
Primary ExaminerManuel A. Antonakas Assistant ExaminerW. Rutledge, Jr. Attorney, Agent, or Firm-Richard G. Stahr [5 7] ABSTRACT A vacuum control assembly for operating the breaker plate of an automotive type ignition distributor through an operating rod to provide ignition spark vacuum advance for an associated internal combustion engine. A range bracket member having an elongated slot of a length determined by the desired range of degrees of ignition spark advance is rigidly secured to the assembly mounting bracket in a location at which the slot accommodates the end portion of the operating rod which engages the distributor breaker plate and is so positioned that one end wall of the slot engages the operating end portion at the point at which the operating end portion is located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
1 Claim, 2 Drawing Figures VACUUM CONTROL ASSEMBLY This invention is directed to a vacuum control assembly for operating the breaker plate of an automotive type ignition distributor through an operating rod to provide ignition spark vacuum advance for an associated internal combustion engine and, more specifically, to a vacuum control assembly of this type having a range bracket member which positions the operating rod at the location at which it should be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
As is well known in the automotive art, the breaker plate of an automotive type ignition distributor is operated by a vacuum control assembly which is usually mounted upon or close to the ignition distributor. The vacuum control assembly includes a diaphragm which is coupled to the breaker plate of the ignition distributor through an operating rod having an elongated portion secured to the diaphragm and an operating end portion extending substantially normal to the elongated portion for operatively engaging the breaker plate. Therefore, the vacuum control assembly changes the angular position of the breaker plate in response to a change of engine vacuum to which one side of the diaphragm is exposed. The diaphragm forms a seal at one side of a vacuum chamber which is in communication with the intake manifold of the associated internal combustion engine and the vacuum chamber accommodates a compression spring which opposes the pressure of ambient air against the exposed opposite side of the diaphragm. When manifold vacuum increases, the pressure of ambient air flexes the diaphragm against the bias of the compression spring and transmits motion to the breaker plate through the operating rod which is thereby revolved in a direction to produce ignition spark vacuum advance. With most, if not all, internal combustion engines, the ignition spark vacuum advance is to be initiated at a specific engine vacuum. However, due to manufacturing tolerances and the resulting differences in length of the operating rod between the several units, the point at which ignition spark advance is to be inititiated may vary within the range of plus or minus one inch of mercury or plus or minus 3 of crankshaft rotation. It has been found that it is much more desirable to initiate spark vacuum advance at the precise magnitude of engine vacuum at which ignition spark advance should be initiated.
It is, therefore, an object of this invention to provide an improved vacuum control assembly for operating the breaker plate of an automotive type ignition distributor.
It is an additional object of this invention to provide an improved vacuum control assembly for operating the breaker plate of an automotive type ignition distrib' utor wherein a range bracket member is so positioned that the operating rod which operates the breaker plate is maintained at the specific location at which it is to be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
In accordance with this invention, a vacuum control assembly for operating the breaker plate of an automotive type ignition distributor is provided wherein a range bracket member is so positioned that the operating rod which revolves the ignition distributor breaker plate is precisely located at the point at which it is to be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
For a better understanding of the present invention, together with additional objects, advantages and features thereof, reference is made to the following description and accompanying drawing in which:
FIG. 1 is a top view of a vacuum control assembly of this invention, and
FIG. 2 is a sectional view of FIG. 1 taken along line 22 and looking in the direction of the arrows.
Referring to the drawing, the vacuum control assem' bly of this invention includes a casing consisting of a chamber member 11 and a cover member 14, a diaphragm 12 enclosed within casing 10 and a compression spring 15 interposed between diaphragm 12 and casing 10 for urging diaphragm 12 in a first direction toward the left as looking at the drawing. Diaphragm 12 is hermetically sealed to chamber member 11 of casing 10 about the periphery thereof to provide a vacuum chamber 16. A vacuum port 18 is in communication with the inside of casing member 10. The side of diaphragm 12 opposite compression spring 15 is exposed to atmosphere, as is well known in the art. An operating rod having an elongated portion 20 secured to the diaphragm member 12 as at 21 and an operating end por tion 22 extending substantially normal to the elongated portion 20 for operatively engaging the breaker plate is oscillated linearly by diaphragm member 12. A mounting bracket 25 is rigidly secured to the cover member 14 of casing member 10 and extends in a direction along operating rod 20 for mounting the vacuum control assembly upon or near the ignition distributor in a position at which the operating end portion 22 operatively engages the distributor breaker plate.
A range bracket member having an elongated slot 31 of a length determined by the desired range of degrees of ignition spark vacuum advance from zero to maximum is rigidly secured to mounting bracket 25 in a location at which slot 31 accommodates the operating end portion 22 of the operating rod and is so positioned that one end wall 31a of slot 31 engages the operating end portion 22 at the point at which the operating end portion 22 is located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
During the manufacturing process, vacuum port 18 is exposed to a constant vacuum of a magnitude equal to the magnitude of engine vacuum at which ignition spark vacuum advance is to be initiated in the associated engine with which the vacuum control assembly is to be used, for example 4" of mercury. This vacuum is maintained until the range bracket member 30 is rigidly secured to mounting bracket 25, as by spot welds 34 and 35 for example, at a location at which end wall 31a of slot 31 thereof is in engagement with the operating end portion 22. Consequently, when vacuum is removed from port 18 and the unit assumes its relaxed position, the operating end portion 22 of the operating rod is precisely located for every one of the vacuum control assemblies at the point at which it should be located with engine vacuum of a magnitude at which ignition spark vacuum advance is to be initiated.
With most internal combustion engines, there is a predetermined maximum number of degrees of ignition spark vacuum advance required. Consequently, slot 31 of range bracket member 30 is designed to be of a length which will provide ignition spark vacuum ad vance only between 0 and the maximum number of degrees. When the operating end portion 22 of the operating rod engages end wall 31b of slot 31, no more ignition spark vacuum advance is provided.
While a preferred embodiment of the present invention has been shown and described, it will be obvious to those skilled in the art that various modifications and substitutions may be made without departing from the spirit of the invention which is to be limited only within the scope of the appended claims.
What is claimed is:
l. A vacuum control assembly for operating the breaker plate of an automotive type ignition distributor to provide ignition spark vacuum advance for an associated internal combustion engine comprising, a vacuum unit including at least a casing, a diaphragm enclosed within said casing in such a manner as to provide a vacuum chamber, a spring interposed between said diaphragm and said casing for urging said diaphragm in a first direction, a vacuum port communicating with said vacuum chamber and an operating rod oscillated 1 4 linearly by said diaphragm having an elongated portion secured to said diaphragm and an operating end portion extending substantially normal to said elongated portion for operatively engaging said breaker plate, a mounting bracket rigidly secured to said casing and extending in a direction along said operating rod, and a range bracket member having an elongated slot of a length determined by the desired range of degrees of ignition spark vacuum advance from zero to maximum which accommodates said operating end portion of said operating rod, said range bracket member, with a predetermined vacuum applied to said vacuum port, being positioned with one end wall thereof in engagement with said operating end portion of said operating rod and rigidly secured to said mounting bracket member whereby an initial compression is set in said spring.

Claims (1)

1. A vacuum control assembly for operating the breaker plate of an automotive type ignition distributor to provide ignition spark vacuum advance for an associated internal combustion engine comprising, a vacuum unit including at least a casing, a diaphragm enclosed within said casing in such a manner as to provide a vacuum chamber, a spring interposed between said diaphragm and said casing for urging said diaphragm in a first direction, a vacuum port communicating with said vacuum chamber and an operating rod oscillated linearly by said diaphragm having an elongated portion secured to said diaphragm and an operating end portion extending substantially normal to said elongated portion for operatively engaging said breaker plate, a mounting bracket rigidly secured to said casing and extending in a direction along said operating rod, and a range bracket member having an elongated slot of a length determined by the desired range of degrees of ignition spark vacuum advance from zero to maximum which accommodates said operating end portion of said operating rod, said range bracket member, with a predetermined vacuum applied to said vacuum port, being positioned with one end wall thereof in engagement with said operating end portion of said operating rod and rigidly secured to said mounting bracket member whereby an initial compression is set in said spring.
US356724A 1973-05-03 1973-05-03 Vacuum control assembly Expired - Lifetime US3924586A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US356724A US3924586A (en) 1973-05-03 1973-05-03 Vacuum control assembly
CA191,551A CA1003286A (en) 1973-05-03 1974-02-01 Distributor vacuum control assembly
GB1815474A GB1432915A (en) 1973-05-03 1974-04-25 Vacuum control assemblies
FR7415400A FR2228161B1 (en) 1973-05-03 1974-05-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US356724A US3924586A (en) 1973-05-03 1973-05-03 Vacuum control assembly

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USB356724I5 USB356724I5 (en) 1975-01-28
US3924586A true US3924586A (en) 1975-12-09

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CA (1) CA1003286A (en)
FR (1) FR2228161B1 (en)
GB (1) GB1432915A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5287833U (en) * 1975-12-25 1977-06-30
JPS53230U (en) * 1976-06-23 1978-01-05

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131020A (en) * 1936-02-24 1938-09-27 Gen Motors Corp Vacuum control of spark advance
US2651316A (en) * 1949-04-12 1953-09-08 R D Fageol Company Speed responsive governor for internal-combustion engines
US3487819A (en) * 1966-07-29 1970-01-06 Mitsubishi Electric Corp Apparatus for controlling the ignition of an automobile engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131020A (en) * 1936-02-24 1938-09-27 Gen Motors Corp Vacuum control of spark advance
US2651316A (en) * 1949-04-12 1953-09-08 R D Fageol Company Speed responsive governor for internal-combustion engines
US3487819A (en) * 1966-07-29 1970-01-06 Mitsubishi Electric Corp Apparatus for controlling the ignition of an automobile engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5287833U (en) * 1975-12-25 1977-06-30
JPS5717087Y2 (en) * 1975-12-25 1982-04-09
JPS53230U (en) * 1976-06-23 1978-01-05

Also Published As

Publication number Publication date
GB1432915A (en) 1976-04-22
USB356724I5 (en) 1975-01-28
FR2228161A1 (en) 1974-11-29
CA1003286A (en) 1977-01-11
FR2228161B1 (en) 1976-12-17

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