US3469106A - Control circuits for electric starting mechanism - Google Patents

Control circuits for electric starting mechanism Download PDF

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Publication number
US3469106A
US3469106A US576133A US3469106DA US3469106A US 3469106 A US3469106 A US 3469106A US 576133 A US576133 A US 576133A US 3469106D A US3469106D A US 3469106DA US 3469106 A US3469106 A US 3469106A
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United States
Prior art keywords
motor
solenoid
current
switch
pinion
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
US576133A
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English (en)
Inventor
Alec Harry Seilly
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.)
CAV Ltd
Original Assignee
CAV Ltd
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Publication date
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Publication of US3469106A publication Critical patent/US3469106A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0851—Circuits or control means specially adapted for starting of engines characterised by means for controlling the engagement or disengagement between engine and starter, e.g. meshing of pinion and engine gear

Definitions

  • a control circuit for an electrical starting mechanism in which a pinion driven by a motor is, via a first solenoid moved into engagement with a toothed wheel and the circuit includes a current sensitive relay through the coil of which current passes to the motor and normally open contacts operable by the magnetic field produced by the coil control the current flow to the solenoid.
  • the current flowing to the solenoid passes through a manually operable switch and a second solenoid operates a motor controlling switch in series with the motor with the second solenoid being energized by operation of the manually operable switch so that with the latter switch closed, the first solenoid is de-energised when the current flowing through the motor falls below a predetermined value.
  • This invention relates to control circuits for controlling the operation of electric starting mechanism of the kind including an electric motor, a pinion arranged to be driven by the motor and movable into engagement with a toothed wheel and a solenoid for effecting said movement.
  • the object of this invention is to provide a control circuit for such a mechanism in a simple and convenient form.
  • FIGURE 1 is a circuit diagram showing one example of a control circuit in accordance with the invention and FIGURE 2 is a circuit diagram showing a modification of the control circuit of FIGURE 1.
  • One example of a starting mechanism with which the control circuit of the invention may be used comprises an electric motor having an extended armature shaft upon the projecting end of which is formed a quick pitch screw thread.
  • an electric motor having an extended armature shaft upon the projecting end of which is formed a quick pitch screw thread.
  • Mounted on the shaft is an axially movable sleeve having a thread complementary to the thread on the shaft with which it is engaged.
  • a pinion which is engageable with a toothed wheel of the engine and also provided is a solenoid having an armature engageable with the sleeve.
  • the arrangement is such that when the solenoid is energised axial movement will be imparted to the pinion thereby to cause same to be engaged with the toothed wheel of the engine.
  • resilient means is provided so that when the solenoid is de-energised the pinion will be moved out of engagement with the toothed wheel.
  • a mechanism of this general type is described in US. Patent No. 3,124,694 but this mechanism includes in addition its own motor controlling switch which is operable by the armature of the solenoid. This switch is omitted in the present case.
  • FIGURE 1 the field coils of .the motor and its armature 11 are shown connected in series with each other.
  • One terminal of the armature 11 is connected to terminal 8 of a source of DC. supply 12.
  • the other terminal of the field coils is connected to the other terminal 9 of the source of supply by way of the coil of a current relay 13 and a pair of normally open contacts of a motor controlling switch 14.
  • One terminal of the solenoid 15 of the mechanism is connected to terminal 8 and "ice the other terminal is connected through a pair of normally open contacts of the current relay and a normally open manually operable switch 16, to terminal 9 of the source of supply.
  • a solenoid 17 which when energised effects closure of the normally open contacts 14, one terminal of the solenoid is connected to terminal 8 and the other terminal to a point intermediate the manually operable switch 16 and the contacts of the current relay 13.
  • the solenoid 17 of the motor controlling switch is energised and the contacts 14 associated therewith close thereby energising the motor.
  • the initial flow of current to the motor is sufiicient to cause the contacts of the current sensitive relay 13 to be closed with the result that the solenoid 15 of the motor is energised and the pinion is moved into engagement with the toothed wheel thereby to effect cranking of the engine.
  • the operator will normally release the manually operable switch 16 and the supply of current to the motor and the solenoid 15 will cease so that the pinion will be moved out of engagement with the toothed wheel of the engine.
  • the current flow to the motor will gradually fall as the speed of the motor increases.
  • the contacts of the current sensitive relay 13 will open and the flow of current to the solenoid 15 will cease thereby allowing the pinion to be moved out of engagement with the toothed wheel partly by the action of the resilient means and partly by the action of the quick screw thread.
  • the motor will however continue to rotate at its light running speed, this speed not being harmful to the rotary parts of the motor.
  • a normally open switch 19 is provided intermediate the field coils 10 and the coil of the current relay.
  • the contacts of the switch are arranged to be closed only when the pinion of the starting mechanism is fully engaged with the toothed wheel of the engine and are positioned within the starter mechanism.
  • a resistor 20 through which current flows to the motor when the motor controlling switch 16 is first operated.
  • a control circuit for controlling the operation of an electric starting mechanism of the kind including an electric motor, a pinion arranged to be driven by the motor and movable into engagement with a toothed wheel, and a solenoid for effecting said movement, the control circuit including a current sensitive relay through the coil of which current passes to the motor, a pair of normally open contacts operable by the magnetic field produced by said coil, said contacts serving to control the flow of current to said solenoid, a manually operable switch through which the current flowing to said solenoid flows, a motor controlling switch in series with said motor and a further solenoid for operating the motor controlling switch, said further solenoid being energised by operation of said manually operable switch the arrangement being such that with the manually operable switch held closed the solenoid controlling the pinion will be de-energised when the current flowing through the motor falls below a predetermined value.
  • a control circuit as claimed in claim 1 including a further normally open switch connected in series with 3 Y 4 said motor and which is arranged to be closed when the 2,542,712 2/1951 Schneider et a1.
  • 290-38 pinion has engaged with the toothed wheel and a resistor 3,177,368 4/ 1965 Seilly 290-38 in parallel with said further switch whereby energisation 3,223,863 12/ 1965 Preece et a1 29038 XR of the motor at full power does not occur until the pinion 3,264,483 8/ 1966 Alexander 290-38 has engaged with the toothed wheel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Direct Current Motors (AREA)
US576133A 1965-09-23 1966-08-30 Control circuits for electric starting mechanism Expired - Lifetime US3469106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB40535/65A GB1138188A (en) 1965-09-23 1965-09-23 Control circuits for electric starting mechanism

Publications (1)

Publication Number Publication Date
US3469106A true US3469106A (en) 1969-09-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US576133A Expired - Lifetime US3469106A (en) 1965-09-23 1966-08-30 Control circuits for electric starting mechanism

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US (1) US3469106A (de)
DE (1) DE1563105C3 (de)
GB (1) GB1138188A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB415977I5 (de) * 1973-11-15 1975-01-28
CN103182997A (zh) * 2011-12-29 2013-07-03 罗伯特·博世有限公司 线路单元、电压电路及其制造方法、限制电流变化的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2881479B1 (fr) * 2005-02-02 2010-09-10 Valeo Equip Electr Moteur Dispositif de commande d'un demarreur de moteur thermique, notamment de vehicule automobile et demarreur comportant un tel dispositif

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2260742A (en) * 1940-05-15 1941-10-28 Bendix Aviat Corp Two-stage engine starter control
US2443648A (en) * 1947-02-05 1948-06-22 Westinghouse Electric Corp Starting means for gas turbines
US2542712A (en) * 1948-10-28 1951-02-20 Gen Motors Corp Engine starting apparatus
US3177368A (en) * 1963-02-15 1965-04-06 Cav Ltd Engine starting mechanism
US3223863A (en) * 1962-06-25 1965-12-14 Lucas Industries Ltd Electric starting mechanism for internal combustion engines
US3264483A (en) * 1963-09-26 1966-08-02 Gen Motors Corp Control system for electric cranking motors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2260742A (en) * 1940-05-15 1941-10-28 Bendix Aviat Corp Two-stage engine starter control
US2443648A (en) * 1947-02-05 1948-06-22 Westinghouse Electric Corp Starting means for gas turbines
US2542712A (en) * 1948-10-28 1951-02-20 Gen Motors Corp Engine starting apparatus
US3223863A (en) * 1962-06-25 1965-12-14 Lucas Industries Ltd Electric starting mechanism for internal combustion engines
US3177368A (en) * 1963-02-15 1965-04-06 Cav Ltd Engine starting mechanism
US3264483A (en) * 1963-09-26 1966-08-02 Gen Motors Corp Control system for electric cranking motors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB415977I5 (de) * 1973-11-15 1975-01-28
US3927359A (en) * 1973-11-15 1975-12-16 Gen Motors Corp Engine starter motor control for preventing damage during hydraulic lock
CN103182997A (zh) * 2011-12-29 2013-07-03 罗伯特·博世有限公司 线路单元、电压电路及其制造方法、限制电流变化的方法

Also Published As

Publication number Publication date
GB1138188A (en) 1968-12-27
DE1563105C3 (de) 1975-02-06
DE1563105B2 (de) 1974-06-20
DE1563105A1 (de) 1971-07-29

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