US3766453A - Starter drive for combustion engines - Google Patents

Starter drive for combustion engines Download PDF

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Publication number
US3766453A
US3766453A US00240642A US3766453DA US3766453A US 3766453 A US3766453 A US 3766453A US 00240642 A US00240642 A US 00240642A US 3766453D A US3766453D A US 3766453DA US 3766453 A US3766453 A US 3766453A
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US
United States
Prior art keywords
output shaft
housing
opening
starter drive
housing means
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
US00240642A
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English (en)
Inventor
J Schenk
Ehrenstein C Von
L Moreira
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3766453A publication Critical patent/US3766453A/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
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors

Definitions

  • a gear unit cooperating with the output shaft,- and located in the opening to protect the interior of the housing against the entry of contaminants is a cupped insert a flange of which is connected with the housing and a transverse wall of which has an opening through which the motor output shaft extends and which is sealed by a sealing ring in sealing engagement with the transverse wall and with the output shaft which the sealing ring surrounds.
  • the present invention relates generally to a starter drive for combustion engines, and more particularly to an improved starter drive in which the entry of contaminantsinto the motor of the drive is prevented.
  • Starter drives for combustion engines serve to turn over the engine until the latter reaches a point where its operation is possible without external aid, that is until the engine is started.
  • Such starter drives use an electromotor which cooperates with a gear unit via which ittransmits starting torque to the engine.
  • the motor is accommodated in a housing which of course must be protected against the entry of contaminants, especially when one considers that the ambient conditions in which such starter drives are required to operate are particularly likely to produce such contaminants in form of dust, dirt, water and the like.
  • Another prior-art construction provides a rubber. sealing ring which is inserted into the housing of the gear unit, surrounding the latter and being pressed in the non-operated condition of the gear unit (that is when the latter is not in use for starting the engine) against a planar annular member which is provided for this purpose.
  • a rubber. sealing ring which is inserted into the housing of the gear unit, surrounding the latter and being pressed in the non-operated condition of the gear unit (that is when the latter is not in use for starting the engine) against a planar annular member which is provided for this purpose.
  • Still another prior-art construction covers the open side oropening of the motor housing with a bearing plate having a bearing sleeve for the motor output shaft.
  • This does protect the interior of the housing against entry of contaminants, but it brings with it a different disadvantage, namely the requirement that the components needed for journalling of the motor output shaft must be produced with veryconsiderable accuracy because in' this instance themotor shaft is usually journalled at three locations and, if even a small dimensional variation in the journalling components is permitted'to exist, a binding of themotor shaft will very likely occur at the journalling locations.
  • Another object of the invention is to provide such an improved starter drive in which tolerance variations in the manufacture, and journalling tolerances of the motor output shaft, are largely without adverse consequences.
  • a concomitant object of the invention is to provide such an improved starter drive which will provide complete protection against the entry of contaminants in all conditions of operation or rest of the starter drive, and which does not adversely affect the drive or any of its components, including the gear unit.
  • a starter drive for combustion engines which, briefly stated, comprises housing means having an opening, and electric starter motor means in the housing means and having an output shaft extending outside through the opening.
  • Gear unit means is connected with the housing means at the open side.
  • Closure means is provided for protecting the interior of the housing means against entry of contaminants via the opening and, in accordance with the invention, comprises a cupped insert received in the opening and having a flange connected with the housing means, a peripheralwall and a bottom wall provided with an aperture through which the output shaft extends. At least one sealing ring is centered about the aperture and surrounds the output shaft in sealing engagement therewith.
  • the cupped insert can be held in place in a simple manner by being retained between the housing means of the electric starter motor and the housing of the gear unit, or it can be suitably connected to one of the housings or to both of them, and when the drive is assembled, the sealing ring will inherently contact and seal with respect to the output shaft.
  • the small braking moment exerted by the sealing ring on themotor output shaft has no influence on the gear unit itself and in any case is so low that the energy loss resulting from it is negligible.
  • the cupped insert is particularly well and simply retained if the sealing ring is compressed between the bottom wall and a pressure washer, with both the sealing ring and the pressure washer being centered at the inner surface of the peripheral wall of the cupped insert, and the cupped washer being retained by at least one radial projection extending inwardly from the inner surface.
  • the cupped washer can advantageously be made of sheet metal, for instance by drawing or stamping, and the projection can be produced by impressing the outer side of the circumferential wall of the cupped insert with a depression which will produce a corresponding radially extending projection at the inner surface of the peripheral wall.
  • the starter drive which has been illustrated by way of example has an electric starter motor which is accommodated in a housing 11.
  • Four field coils 12 and a turnable armature 13 are provided in the housing 11 one axial end of which is provided with a bearing shield 14 surrounding the collector of the armature.
  • the brushessliding on the collector are carried by the shield 14 and the latter also has a journalling sleeve for the output shaft 15.
  • the opposite axial end of the housing 11 is'open, having secured thereto a housing 16 of a gear unit, and the armature shaft or output shaft 15 extends through the open end of the housing 11 and through the housing 16 to extend beyond the latter (to the left in FIG. 1)
  • Theportion17 of the shaft 15 which is located within the housing 16 has a steep-pitch external screwthread on'which a sleeve18 is rotatably and axially displaceably engaged, having a corresponding internal screwthread.
  • a free wheeling unit 19 connects the sleeve 18 in a manner known per se with a pinion 20. In the illustrated embodiment the latter is located outside the housing 16.
  • the end portion-21 of the shaft 15 which extends outside the housing 16 is provided with an annular shoulder 22 serving as an abutment for the pinion when the same moves towards the left in FIG. 1. It further is provided with ajournalling portion 23 which when the drive isinstalled will be joumalled in a sleeve of the gear'housing of the combustion engine, which sleeve will thus' serve as a second journal for'the shaft 15.
  • a removable protective cap 24 is between the free wheeling device 19 and a bore through which the gear unit in the gearjunit housing 16 can be inserted, and this cap prevents damage of the components, particularly the shaft 15 as well as the components mounted on it, and also centers the shaft 15 and these components with respect to the housing during transport.
  • the cap 24 is removed and thereupon the portion 23.is inserted into the non-illustrated journalling sleeve at the gear housing of the combustion engine.
  • a lateral-arm portion 25of the housing 16 has secured ther'eto the housing of an electromagnet 26 whose non-illustrated armature acts in conventional manner (which is not believed to require detailed illustra'tion) via a double-armed lever 27a shown in broken lines and pivotably joumalled at 27 in the arm portion 25, upon the hollow shaft 18. It isknown that with such an arrangement'the energization of the electromagnet results in a displacement of the sleeve 18 together with the device 19 and the pinion 20 towards the left in FIG. 1, that is towards the engaging gear of the combustion engine (not shown) until the pinion 20 is fully in mesh with such gear, at which point it will be in abutment with the shoulder 22.
  • the armature of the electromagnet 26 also operates two electrical contacts 28 and 29 of which one is connected with a starter switch and the other via a conductor 30 with the motor 10. This means that the motor 10 receives current via the contacts 28 and 29 and thus turns the pinion 20, rotating the combustion engine until the latter can start and operate by itself.
  • the open, side of the housing 11 isprotected against the entry of contaminants by a cupped insert 32 of circular outline and advantageously consisting of sheet material, such as drawn sheet metal.
  • the drawing shows, particularly in FIG. 2, that the insert 32 has a transverse or bottom wall 33, a circumferential wall 34 and a flange 35 which latter in the illustrated embodiment is connected with the housing 16 via a circlet or spring ring.
  • An aperture or bore 36 is provided in the transverse wall 33 and the shaft 15 extends with play through this aperture 36.
  • the outer diameter of the ring 37 corresponds to the inner diameter of the peripheral wall 34, so that the ring 37 is centered by the wall 34.
  • a metallic retaining and pressure washer 38 is also placed about the shaft 15, pressing the sealing ring 37 against the transverse wall 33 and having also such a diameter that it is centered by the inner circumferential surface of the wall34.
  • plurality of projections 39 are provided, circumferen-;
  • the present invention provides for a highly effective but equally simple construction,-utilizing simple and inexpensive components which assure a reliable sealing of the interior of the housing ll against' the entry of any kinds of contaminants, including dust, dirt and moisture.
  • the entry of such contaminants in the gap between the device 19 and the bore in thehousing 16, and from there into the-housing ll', is thus precluded.
  • the rubber or other elastomeric material of the ring 37 could be replaced by dif-" ferent material, for instance by a ring made of felt or a ring made of a suitable composition material such as" is used for gaskets or other sealing purposes.
  • dif-" ferent material for instance by a ring made of felt or a ring made of a suitable composition material such as" is used for gaskets or other sealing purposes.
  • the insert 32 can also be connected with the housing 11 rather than the housing 16, or it can bepressed and:
  • a starter drive for combustion engines in combination, housing means having an opening; electric starter motor means in said housing means and having an output shaft extending with clearance outside through said opening; gear unit means connectedwith said housing means adjacentsaid opening; and closure means for protecting the interior of said housing means against entry of contaminants via said opening, comprising a cupped insert received in said opening and having a flange connected with said housing means, a peripheral wall and a bottom wall provided with an aperture whose diameter is only slightly larger than that of said output shaft and through which said output shaft extends, at least one sealing washer located inwardly of said bottom wall in abutment therewith and surrounding said output shaft in sealing engagement with the latter, said sealing washer having an outer periphery in engagement with an inner circumferential surface of said peripheral wall so that said sealing washer is centered by the letter with reference to said aperture, and said closure means further including an annular retaining washer surrounding said shaft with clearance inwardly of and in abutment with said sealing
  • said gear unit means comprising an additional housing connected with said housing means.
  • said output shaft having a portion extending beyond said gear unit means on a side thereof remote from said housing means; and further comprising a gear member carried by said portion of said output shaft.

Landscapes

  • 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 Or Generator Frames (AREA)
US00240642A 1971-04-02 1972-04-03 Starter drive for combustion engines Expired - Lifetime US3766453A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712116052 DE2116052A1 (de) 1971-04-02 1971-04-02 Andrehvorrichtung fur Brennkraft maschinen

Publications (1)

Publication Number Publication Date
US3766453A true US3766453A (en) 1973-10-16

Family

ID=5803636

Family Applications (1)

Application Number Title Priority Date Filing Date
US00240642A Expired - Lifetime US3766453A (en) 1971-04-02 1972-04-03 Starter drive for combustion engines

Country Status (8)

Country Link
US (1) US3766453A (de)
JP (1) JPS4735433A (de)
BR (1) BR7201880D0 (de)
DE (1) DE2116052A1 (de)
ES (1) ES401307A1 (de)
FR (1) FR2133421A5 (de)
GB (1) GB1363378A (de)
IT (1) IT950339B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855489A (en) * 1973-05-14 1974-12-17 Gen Electric Dynamoelectric machine having improved lint guard means
US4336473A (en) * 1979-11-05 1982-06-22 Franklin Electric Co., Inc. Electric motor
US4525632A (en) * 1982-02-02 1985-06-25 Mitsubishi Denki Kabushiki Kaisha Starter motor for an internal combustion engine
US5619082A (en) * 1994-09-16 1997-04-08 Samsung Electronics Co., Ltd. Electric motor with sealing structure resisting the entry of sand and dust
US6563240B2 (en) 2001-04-24 2003-05-13 A. O. Smith Corporation Electric motor having a rain baffle
US20100082218A1 (en) * 2008-09-29 2010-04-01 John Andrew Layer Starter drive assembly and method of starting an engine
US20100077769A1 (en) * 2008-09-29 2010-04-01 John Andrew Layer Starter drive assembly and method of starting a gas turbine engine
US20140096986A1 (en) * 2012-10-05 2014-04-10 Makita Corporation Power tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378954A1 (fr) * 1976-12-22 1978-08-25 Paris & Du Rhone Demarreur perfectionne a faux palier intermediaire
ZA783651B (en) * 1977-07-01 1979-06-27 Lucas Industries Ltd Starter motor
DE3131149A1 (de) * 1981-08-06 1983-02-24 Robert Bosch Gmbh, 7000 Stuttgart Andrehvorrichtung fuer brennkraftmaschinen
DE102007061115B4 (de) * 2007-12-19 2016-07-21 Robert Bosch Gmbh Starter für eine Brennkraftmaschine mit Schmutzabweiser zwischen Startermotor und Getriebe

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2670976A (en) * 1950-05-11 1954-03-02 Frank M Owen Flexible joint and sealing element therefor
US3025716A (en) * 1959-09-24 1962-03-20 Gen Motors Corp Lubricant control means
US3143897A (en) * 1962-05-29 1964-08-11 Gen Electric Gear mechanisms and method of making the same
US3178191A (en) * 1964-02-06 1965-04-13 Bendix Corp Sealing structure
US3250541A (en) * 1962-03-08 1966-05-10 Chicago Rawhide Mfg Co Radial lip seals
US3319093A (en) * 1965-11-15 1967-05-09 Leonard M Todd Submersible appliance driver with insulated housing
US3497706A (en) * 1966-02-25 1970-02-24 Mcculloch Corp Electrical starter system for gasoline engines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2670976A (en) * 1950-05-11 1954-03-02 Frank M Owen Flexible joint and sealing element therefor
US3025716A (en) * 1959-09-24 1962-03-20 Gen Motors Corp Lubricant control means
US3250541A (en) * 1962-03-08 1966-05-10 Chicago Rawhide Mfg Co Radial lip seals
US3143897A (en) * 1962-05-29 1964-08-11 Gen Electric Gear mechanisms and method of making the same
US3178191A (en) * 1964-02-06 1965-04-13 Bendix Corp Sealing structure
US3319093A (en) * 1965-11-15 1967-05-09 Leonard M Todd Submersible appliance driver with insulated housing
US3497706A (en) * 1966-02-25 1970-02-24 Mcculloch Corp Electrical starter system for gasoline engines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855489A (en) * 1973-05-14 1974-12-17 Gen Electric Dynamoelectric machine having improved lint guard means
US4336473A (en) * 1979-11-05 1982-06-22 Franklin Electric Co., Inc. Electric motor
US4525632A (en) * 1982-02-02 1985-06-25 Mitsubishi Denki Kabushiki Kaisha Starter motor for an internal combustion engine
US5619082A (en) * 1994-09-16 1997-04-08 Samsung Electronics Co., Ltd. Electric motor with sealing structure resisting the entry of sand and dust
US6563240B2 (en) 2001-04-24 2003-05-13 A. O. Smith Corporation Electric motor having a rain baffle
US20100082218A1 (en) * 2008-09-29 2010-04-01 John Andrew Layer Starter drive assembly and method of starting an engine
US20100077769A1 (en) * 2008-09-29 2010-04-01 John Andrew Layer Starter drive assembly and method of starting a gas turbine engine
US8014934B2 (en) 2008-09-29 2011-09-06 General Electric Company Starter drive assembly and method of starting an engine
US20140096986A1 (en) * 2012-10-05 2014-04-10 Makita Corporation Power tool

Also Published As

Publication number Publication date
BR7201880D0 (pt) 1973-05-24
GB1363378A (en) 1974-08-14
DE2116052A1 (de) 1972-10-26
JPS4735433A (de) 1972-11-25
FR2133421A5 (de) 1972-11-24
IT950339B (it) 1973-06-20
ES401307A1 (es) 1975-02-16

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