US3626116A - Ignition distributors - Google Patents

Ignition distributors Download PDF

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Publication number
US3626116A
US3626116A US847253A US3626116DA US3626116A US 3626116 A US3626116 A US 3626116A US 847253 A US847253 A US 847253A US 3626116D A US3626116D A US 3626116DA US 3626116 A US3626116 A US 3626116A
Authority
US
United States
Prior art keywords
shaft
cam shaft
driven shaft
driven
distributor
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
US847253A
Other languages
English (en)
Inventor
William Harold Cooksey
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 US3626116A publication Critical patent/US3626116A/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
    • 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
    • F02P5/06—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 engine speed

Definitions

  • This invention relates to ignition distributors of the kind including a casing, a driven shaft rotatably mounted within the casing and adapted to be driven by the engine of a road vehicle, a contact breaker assembly mounted within the casing, and a hollow cam shaft mounted for limited angular movement on said driven shaft, with the cam shaft being rotatable with said driven shaft to operate the contact breaker assembly and said cam shaft being moved angularly relative to said driven shaft by a centrifugal mechanism to vary the ignition timing of the distributor.
  • a resilient strip is interposed between said driven shaft and said cam shaft with the end portions of the strip engaging the inner surface of the cam shaft at generally diametrically spaced points and the midregion of the strip being flexed to engage the circumference of a portion of reduced diameter of the driven shaft, so that the resilient strip moves with the cam shaft and bears against the portion of reduced diameter whereby friction between the portion of reduced diameter and the resilient strip damps angular oscillation of the cam shaft relative to the driven shaft.
  • FIG. 1 is a fragmentary, part sectional view of an ignition distributor
  • FIG. 2 is a sectional view of the shaft assembly of the ignition distributor shown in FIG. I, and
  • FIG. 3 is a sectional view on the line 3-3 in FIG. 2.
  • a distributor, driven shaft 11 which is journaled for rotation in a distributor casing 10.
  • the shaft ll projects from the casing and is provided with a dog coupling through which the shaft I l is rotatably driven in timed relation to the crank shaft of an internal combustion engine with which the distributor is associated.
  • a hollow cam shaft 12 which is held against axial movement relative to the shaft ll by means of a screw (not shown), the head of which engages a peripheral, internal, shoulder at the upper end of the cam shaft, and the shank of which is in screw threaded engagement with the shaft ll.
  • the cam shaft 12 rotates with the shaft I1, and is coupled thereto through a conventional centrifugal advance mechanism, which, as the speed of rotation of the shaft 11 increases, displaces the cam shaft 12 angularly with respect to the shaft 11, while transmitting rotational movement of the shaft 11 to the cam shaft 12.
  • the cam shaft 12 acts on a conventional contact breaker assembly 10a supported within the distributor casing 10, so that the contacts of the contact breaker assembly are opened and closed in timed relation to the rotation of the engine.
  • the centrifugal advance mechanism varying the timing of the operation of the contact breaker assembly 10a as the speed of rotation of the engine varies.
  • the shaft 11 is provided with a portion 13 of reduced diameter intermediate its ends, and resilient means is interposed between the shaft 11 and the cam shaft 12 to damp angular movements of the cam shaft 12 relative to the shaft 11.
  • the resilient means is in the form of a strip 14 of spring steel the ends of which engage the inner surface of the cam shaft 12 at a pair of generally diametrically spaced points, and the midregion of which is flexed to engage the circumference of the portion 13 of the shaft 11.
  • the spring strip 14 moves with the cam shaft 12, and bears against the portion 13 of the shaft 11 so that friction between the portion 13 of the shaft 11, and the spring 14 damps angular oscillation of the cam shaft 12 relative to the shaft 11.
  • the parameters of the arrangement are so chosen that although the cam shaft 12 is effectively damped, the function of the centrifugal mechanism is not materially effected.
  • An ignition distributor comprising a casing, a driven shaft rotatably mounted within the casing and arranged to be driven.
  • a hollow cam shaft mounted for limited angular movement on said driven shaft, said cam shaft being rotatable with said driven shaft to operate a contact breaker assembly of the distributor, and said cam shaft being movable angularly relative to said driven shaft by a centrifugal mechanism housed within the distributor casing, to vary the ignition timing of the distributor, a resilient strip having opposite end portions and a midregion, said driven shaft being provided with a portion of reduced diameter, the opposite end portions of the resilient strip engaging the inner surface of the hollow cam shaft at a pair of generally diametrically spaced points and the midregion of the resilient strip being flexed for engaging the circumference of the portion of reduced diameter of the driven shaft so that the resilient strip moves with the cam shaft and bears against the portion of reduced diameter whereby friction between the portion of reduced diameter and the resilient strip damps angular oscillation of the cam shaft relative to the driven shaft.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US847253A 1968-08-22 1969-08-04 Ignition distributors Expired - Lifetime US3626116A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4017568 1968-08-22

Publications (1)

Publication Number Publication Date
US3626116A true US3626116A (en) 1971-12-07

Family

ID=10413573

Family Applications (1)

Application Number Title Priority Date Filing Date
US847253A Expired - Lifetime US3626116A (en) 1968-08-22 1969-08-04 Ignition distributors

Country Status (6)

Country Link
US (1) US3626116A (es)
BR (1) BR6911654D0 (es)
DE (1) DE1941343B2 (es)
ES (1) ES175152Y (es)
FR (1) FR2016163A1 (es)
GB (1) GB1266690A (es)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473343A (en) * 1942-06-27 1949-06-14 Citroen Sa Andre Centrifugal switch device
US2828374A (en) * 1955-01-21 1958-03-25 Gen Motors Corp Ignition distributor
GB833068A (en) * 1957-07-08 1960-04-21 Lucas Industries Ltd Engine-ignition spark distributors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473343A (en) * 1942-06-27 1949-06-14 Citroen Sa Andre Centrifugal switch device
US2828374A (en) * 1955-01-21 1958-03-25 Gen Motors Corp Ignition distributor
GB833068A (en) * 1957-07-08 1960-04-21 Lucas Industries Ltd Engine-ignition spark distributors

Also Published As

Publication number Publication date
ES175152U (es) 1972-06-01
DE1941343A1 (de) 1970-02-26
GB1266690A (es) 1972-03-15
DE1941343B2 (de) 1972-12-21
BR6911654D0 (pt) 1973-04-19
ES175152Y (es) 1973-02-16
FR2016163A1 (es) 1970-05-08

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