EP0407694A1 - Moteur monocylindre avec console multifonctionnelle - Google Patents

Moteur monocylindre avec console multifonctionnelle Download PDF

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Publication number
EP0407694A1
EP0407694A1 EP90106916A EP90106916A EP0407694A1 EP 0407694 A1 EP0407694 A1 EP 0407694A1 EP 90106916 A EP90106916 A EP 90106916A EP 90106916 A EP90106916 A EP 90106916A EP 0407694 A1 EP0407694 A1 EP 0407694A1
Authority
EP
European Patent Office
Prior art keywords
bracket
engine
flywheel
crankcase
crankshaft
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.)
Granted
Application number
EP90106916A
Other languages
German (de)
English (en)
Other versions
EP0407694B1 (fr
Inventor
Kevin G. Bonde
Mark T. Holschuh
Lee E. Roller
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.)
Tecumseh Products Co
Original Assignee
Tecumseh Products 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 Tecumseh Products Co filed Critical Tecumseh Products Co
Publication of EP0407694A1 publication Critical patent/EP0407694A1/fr
Application granted granted Critical
Publication of EP0407694B1 publication Critical patent/EP0407694B1/fr
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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/007—Other engines having vertical crankshafts

Definitions

  • the present invention relates generally to a single cylinder internal combustion engine and more particularly to such an engine having a plurality of accessory systems mounted thereto.
  • the present invention involves, according to one embodiment thereof, an internal combustion engine having a bracket encircling the crankshaft at the top of the crankcase and attached thereto at a few discrete points, with the bracket having assembled thereto as a subassembly a plurality of accessories including at least some of the following: a safety brake, a throttle control lever, an electric starter, and an alternator, with cooling air baffles and finger guards integrated into the bracket.
  • the present invention overcomes the problems discussed above in that a common bracket is provided which encircles the crankshaft proximate the flywheel, and a variety of individual components which are usually mounted in that area directly to the engine block or crankcase are pre-mounted as a subassembly to the bracket, which sub-assembly is then mounted to the crankcase. This allows for automated assembly of the sub-assembly and reduces the number of fasteners involved in final assembly.
  • the bracket to which the various accessories are mounted is generally flat and encircles the drive shaft between the flywheel and the crankcase. Upturned perimetric edges provide for stiffening of the bracket, and several pivot pins upon which the accessories pivot are fixed to the bracket and stand upright therefrom.
  • the invention in one form thereof, involves a single cylinder air-cooled internal combustion engine having a crankcase, a crankshaft and a flywheel mounted thereto, and a bracket encircling the crankshaft and attached to the crankcase.
  • a safety brake means selectively engageable with the flywheel for stopping rotation of the engine is provided, and the safety brake means is mounted to the bracket.
  • the invention in accordance with another aspect thereof, involves a method of assembling a single cylinder air-cooled internal combustion engine having a crankcase, a crankshaft and a flywheel mounted thereto, safety brake means selectively engageable with the flywheel for stopping rotation of the engine, and a throttle control lever.
  • the method includes the steps of providing a bracket configured to mount to the engine encircling the crankshaft, mounting the safety brake means to the bracket, mounting the throttle control lever to the bracket, and mounting the bracket with safety brake means and throttle control lever to the engine so as to encircle the crankshaft.
  • crankshaft 14 is disposed in crankcase 12 and has a reduced diameter portion 16 rotatably journalled in upper bearing 18 formed in sleeve 20 which is cast integrally with top wall 22 of crankcase 12.
  • Crankshaft 14 has a further reduced diameter portion 28 extending upwardly out of sleeve 20 and includes a tapered section 30 and a threaded section 32 thereabove.
  • crankshaft 14 Received on portion 28 of crankshaft 14 is a cast flywheel 34 having a tapered bore 36 which is complementary to tapered section 30 and frictionally engaged therewith and retained by a zinc key (not shown). Flywheel 34 is retained on tapered section 30 by a threaded nut 36 threadedly received on threaded section 32 and bearing on washer 38.
  • cup shaped member 40 Disposed between washer 38 and flywheel 34 is a cup shaped member 40 which is linked via pull starter means (not shown) within cover 42 to a pull starter rope 44. Nut 36 and washer 38 clamp cup shaped member 40 to the top of flywheel 34 for rotation therewith. Attached to cup shaped member 40 radially outwardly thereof is an annular member 46 having a plurality of generally radially extending blades 48 forming a centrifugal air blower. Attached to the peripheral rim 50 of flywheel 34 is an annular ring gear 52 whose teeth 54 extend substantially radially outwardly for drive engagement with the pinion gear 56 of an electric starter motor, which is described further below.
  • Bracket 60 Engaging the top wall 22 of crankcase 12 at boss 58 for instance is a generally horizontally disposed bracket 60 which encircles crankshaft 14, sleeve 20 and other structure on the top end of crankcase 12.
  • Bracket 60 is preferably constructed of stamped sheet steel with a generally flat bottom wall 62 substantially perpendicular to crankshaft 14 and an upturned inner perimetric edge portion 64 and an upturned outer peripheral edge portion 66.
  • Inner and outer edge portions 64 and 66 stand upwardly generally perpendicular to bottom wall 62 and serve to add rigidity against flexure to bracket 60 as well as providing structure to which blower housing 68 is attached.
  • Bottom wall 62 in addition to serving structural support functions as described further below, also serves as a finger guard to keep an operator's fingers from coming into contact with the flywheel during operation of the engine.
  • bracket 60 includes an elongated air baffle portion 70 extending alongside and generally parallel to the engine cylinder 72 which serves to block air flow generated by the rotation of air blades 48 from exiting downwardly out of blower housing 68 beside cylinder 72. Instead, air baffle portion 70 causes the air flow to be directed downwardly over cylinder 72, the cooling fins 74 of which help to dissipate heat generated by combustion. Bracket 60 also includes an extended portion 76 which supports a variety of engine accessories, as described in greater detail below. Strengthening ribs are provided in bottom wall 62 for greater rigidity by means of elongated stamped channels 78, 80, 82, 84 and 86.
  • Three circumferentially spaced holes 88, 90 and 92 through bottom wall 62 provide attachment points at which bracket 60 is attached to crankcase 12 by bolts received therethrough.
  • Each threaded bolt (not shown) is threadedly received in a vertical threaded hole in a boss (not shown) on the top of crankcase 12.
  • a stud 94 which serves as the pivot pin for the safety brake, as described further below, is received in a bore in boss 58 for accurate location of the entire assembly and the brake especially.
  • bracket 60 is illustrated as part of a subassembly which is preferably assembled separately and apart from the assembly of engine 10 per se.
  • the subassembly of FIG. 3 includes in the embodiment illustrated herein a safety brake 96 and control lever 98, an electric starter 100, throttle control levers 102, and an alternator 104.
  • safety brake 96 includes pivot stud 94 having a lower portion 106 which extends through a hole in bottom wall 62 of bracket 60 and is received in a corresponding controlled diameter hole in boss 58 of crankcase 12.
  • a shoulder 108 on stud 94 is disposed above bottom wall 62 and supports brake lever 110 which is pivoted on stud 94.
  • a snap ring 112 engaging an annular groove at the top of pivot stud 94 retains brake lever 110 thereon.
  • a coil spring 114 is attached at a first end thereof to brake lever 110 at hole 116 and at a second end thereof to a hole 118 in bracket 60.
  • Spring 114 is so positioned as to generate a moment in brake lever 110 about pivot stud 94 in a clockwise direction as viewed in FIGS. 2 and 3, which causes brake friction pad 120 to be urged against annular inner peripheral surface 122 of flywheel 34.
  • the geometry of brake lever 110, pivot 94, spring 114 and flywheel surface 122 is such that upon actuation of the brake, the rotation of flywheel 34 in a clockwise direction as viewed in FIGS. 2 and 3 causes the braking action to become self-energizing.
  • Brake lever 110 is retracted from the braking position by intermediate control link 124 which is attached at one end to hole 126 of brake lever 110 and at the other end to hole 128 of control lever 98.
  • Such pivoting applies tension to control link 124 in opposition to tension from spring 114 and generates a moment in brake lever 110 counterclockwise about pivot stud 94, thereby pivoting brake lever 110 and brake friction pad 120 away from flywheel wall 122, disengaging the brake.
  • Electric starter 100 includes an electric starter motor 134 oriented vertically and located below bottom wall 62 of bracket 60 and attached thereto by nuts 136 received on threaded mounting studs connected with motor 134.
  • the shaft 140 of motor 134 extends upwardly through a hole in bottom wall 62 and has retained thereon for rotation therewith a pinion gear 142 which engages teeth 54 of ring gear 52 on flywheel 34.
  • Bracket 60 in this regard provides a fixed attachment point relative to engine 10 upon which starter motor 134 is attached with precise spacing relative to ring gear 52, which permits an accurate mesh between pinion gear 142 and ring gear 52.
  • Throttle control lever 102 is pivoted on a stud attached to bottom wall 62 of bracket 60 and extending substantially perpendicular thereto.
  • Lever 102 serves to transmit motion from a bowden cable operated by the operator to the conventional throttle lever of the carburetor (not shown).
  • Bracket 60 and lever 102 in this regard provide a fixed point relative to the engine and carburetor for support of the carburetor control linkage.
  • Alternator 104 includes a core 144 and windings 146 and is attached to bottom wall 62 by bolts 148 and nuts 150 with spacer sleeves 152 received about bolts 148 between core 144 and bottom wall 62.
  • Core 144 is thereby spaced from bottom wall 62 at a level at which it is properly aligned with flywheel 34 such that electricity is generated therein by the rotation therepast of the permanent magnet 154 of flywheel 34.
  • each of the above described accessories namely safety brake 96 and control lever 98, electric starter 100, throttle control lever 102, and alternator 104 is first assembled and attached to bracket 60 one at a time until as many of the accessories as are desired for a particular engine have been so attached. Then the entire subassembly consisting of bracket 60 and attached accessories is attached to engine 10 as described above by means of bolts received through mounting holes 88, 90 and 92.
  • the pivot stud 94 of the safety brake 96 is somewhat of a special case in that because of the large forces which it must transmit from flywheel 34 to crankcase 12 during braking, stud 94 is piloted directly in crankcase 12 in addition to first being attached to bracket 60 during prior assembly of the subassembly.
  • bracket 60 This also provides for accurate location of the bracket 60 and especially the brake mechanism.
  • the remaining accessories are attached only indirectly to crankcase 12 via intermediate bracket 60. It should also be noted that the advantages to be gained from prior subassembly of the various accessories to a common bracket before final assembly of the engine do not prevent any of the accessories from being designated optional. It is a simple matter to leave off one or more accessories from the bracket during subassembly if it is desired to omit certain accessories from particular engine models.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP19900106916 1989-07-13 1990-04-11 Moteur monocylindre avec console multifonctionnelle Expired - Lifetime EP0407694B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37948589A 1989-07-13 1989-07-13
US379485 1989-07-13

Publications (2)

Publication Number Publication Date
EP0407694A1 true EP0407694A1 (fr) 1991-01-16
EP0407694B1 EP0407694B1 (fr) 1993-09-22

Family

ID=23497459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900106916 Expired - Lifetime EP0407694B1 (fr) 1989-07-13 1990-04-11 Moteur monocylindre avec console multifonctionnelle

Country Status (4)

Country Link
EP (1) EP0407694B1 (fr)
AU (1) AU629368B2 (fr)
CA (1) CA1331150C (fr)
DE (1) DE69003474D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020013825A1 (fr) * 2018-07-12 2020-01-16 Briggs & Stratton Corporation Moteur à combustion interne à système de démarrage électrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1565110A (en) * 1925-12-08 snyder
EP0080255A1 (fr) * 1981-11-16 1983-06-01 Tecumseh Products Company Commande d'un moteur avec un freine à volant auto-stimulant
EP0280199A2 (fr) * 1987-02-27 1988-08-31 Yamaha Motor Co., Ltd. Moteur vertical pour tondeuse à gazon
US4838908A (en) * 1988-07-27 1989-06-13 Kohler Co. Engine air intake screen assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263663A (en) * 1963-09-09 1966-08-02 Crusader Marine Corp Engine
US3730147A (en) * 1971-10-29 1973-05-01 Gen Motors Corp Engine accessory arrangement
US4519347A (en) * 1982-02-22 1985-05-28 Propane Carburetion Company, Inc. Bracket for supporting low pressure gas carburetor and components

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1565110A (en) * 1925-12-08 snyder
EP0080255A1 (fr) * 1981-11-16 1983-06-01 Tecumseh Products Company Commande d'un moteur avec un freine à volant auto-stimulant
EP0280199A2 (fr) * 1987-02-27 1988-08-31 Yamaha Motor Co., Ltd. Moteur vertical pour tondeuse à gazon
US4838908A (en) * 1988-07-27 1989-06-13 Kohler Co. Engine air intake screen assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020013825A1 (fr) * 2018-07-12 2020-01-16 Briggs & Stratton Corporation Moteur à combustion interne à système de démarrage électrique
US11408326B2 (en) 2018-07-12 2022-08-09 Briggs & Stratton, Llc Internal combustion engine with electric starting system
US11639681B2 (en) 2018-07-12 2023-05-02 Briggs & Stratton, Llc Internal combustion engine with electric starting system

Also Published As

Publication number Publication date
DE69003474D1 (de) 1993-10-28
AU5862390A (en) 1991-01-17
AU629368B2 (en) 1992-10-01
EP0407694B1 (fr) 1993-09-22
CA1331150C (fr) 1994-08-02

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