EP2079919A1 - Carter et moteur à combustion interne - Google Patents

Carter et moteur à combustion interne

Info

Publication number
EP2079919A1
EP2079919A1 EP06812996A EP06812996A EP2079919A1 EP 2079919 A1 EP2079919 A1 EP 2079919A1 EP 06812996 A EP06812996 A EP 06812996A EP 06812996 A EP06812996 A EP 06812996A EP 2079919 A1 EP2079919 A1 EP 2079919A1
Authority
EP
European Patent Office
Prior art keywords
crankcase
fan
cooling
wall
air
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
EP06812996A
Other languages
German (de)
English (en)
Other versions
EP2079919A4 (fr
EP2079919B1 (fr
Inventor
Peter Johansson
Peter Gunnarsson
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.)
Husqvarna AB
Original Assignee
Husqvarna AB
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 Husqvarna AB filed Critical Husqvarna AB
Publication of EP2079919A1 publication Critical patent/EP2079919A1/fr
Publication of EP2079919A4 publication Critical patent/EP2079919A4/fr
Application granted granted Critical
Publication of EP2079919B1 publication Critical patent/EP2079919B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/007—Adaptations for cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • 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

Definitions

  • the invention relates to a crankcase for an air-cooled combustion engine for a handheld working machine, for example a brushcutter or a trimmer, with a crankcase chamber, a fan wheel side with a fan scroll and a fan wheel, arranged in the fan scroll, with fan blades, a clutch side with a clutch housing opposite the fan wheel side, and, between the fan wheel side and the clutch side, a number of sides with crankcase walls, among them a first side constituting the fan wheel side, with a wall comprising at least one opening for a connecting rod.
  • the invention also relates to a combustion engine unit comprising at least an engine cylinder, a crankcase, a carburettor and a muffler.
  • the invention also relates to a handheld working machine, for example a brushcutter or a trimmer, with a rotating working tool, for example a saw blade, for clearing of smaller trees, bushes, brush or grass.
  • crankcase chamber and the crankcase walls of conventionally designed crankcases for combustion engines are significantly heated during engine operation.
  • This can imply problems.
  • the main bearings i.e. the crankshaft bearings that are arranged inside the crankcase chamber
  • can overheat particularly the main bearing on the clutch side runs the risk of overheating
  • partly the carburettor can overheat through heat radiation from the crankcase side that is facing the carburettor. Heating of the carburettor from the crankcase can become particularly troublesome during a break, e.g. due to refuelling or any other reason, when the engine's fan wheel is at a standstill and therefore no cooling-air circulation takes place.
  • the crankcase is characterised in that, through a crankcase wall on at least one side between the fan wheel side and the clutch side, one or more cooling ducts extend between one or more inlet openings for cooling air in the fan scroll and one or more outlet openings for the cooling air, exiting into the clutch housing, for cooling of the wall on said at least one side between the fan wheel side and the clutch side.
  • the fan wheel can, but needs necessarily not, be integrated in a flywheel.
  • a separate flywheel can for instance be arranged on the clutch side.
  • the combustion engine unit is characterised in that the carburettor is arranged on the side of the crankcase where the said crankcase wall is provided with one or more cooling ducts, such that both the outer side, exposed towards the carburettor, and the inner side, exposed towards the crankcase chamber, are cooled by cooling air flowing through the duct or ducts, when the engine is operating.
  • Fig. 1 partly schematically, shows a combustion engine unit according to the invention, comprising a crankcase, viewed towards the fan wheel side, and a symbolically illustrated carburettor, engine cylinder and muffler,
  • Fig. 2 shows a perspective view of the crankcase as well as the fan wheel in a view from the rear/below
  • Fig. 3 shows a detail in Fig. 2 in larger scale
  • Fig. 4 shows a frontal view of the crankcase, i.e. towards the clutch side
  • Fig. 5 shows the crankcase towards the side that is directed towards the carburettor
  • Fig. 6 shows a cross sectional view of the crankcase and the fan wheel along the line
  • a crankcase according to the preferred embodiment of the invention is generally designated 1 in the drawing figures.
  • the fan wheel 3 is in a conventional way provided with fan blades 5 and forms together with the fan scroll a centrifugal fan, that is driving cooling air out through an outlet section 6 in the fan scroll 4 for cooling of primarily an engine cylinder 8 (schematically shown in Fig. 1), that is an integral part of a combustion engine.
  • the fan wheel 3 is, when the engine is running, rotated by a crankshaft 10, that extends through the crankcase 1.
  • clutch side 11, Fig. 5, that is located opposite the fan wheel side 2 there is a not shown centrifugal clutch for the crankshaft's 10 driving of a working tool, for example a rotating saw blade on a brushcutter via a transmission.
  • the not shown centrifugal clutch is, when assembled, arranged in a clutch housing 12, that, when assembled, normally is covered by a not shown clutch cover.
  • crankcase 1 forms a part of a combustion engine unit, generally designated 14 in Fig. 1. Included in unit 14 are, apart from crankcase 1 and cylinder 8, also a carburettor 15 or other arrangement for supply of air/fuel mixture to the cylinder 8 and a muffler 16. Cylinder 8 is connected to crankcase 1 on one of the sides of the crankcase between the fan wheel side 2 and the clutch side 11, here designated cylinder connection side 17. Two other sides are designated; carburettor side 18, on which the carburettor 15 is connected and muffler side 19, on which side the muffler 16 is arranged at a short distance from the crankcase.
  • a crankcase chamber is designated 20.
  • the crankshaft 10 is suspended in the crankcase chamber 20 by means of two main bearings, namely a first main bearing 23 fitted in a crankcase gable 25 on the clutch side 11 and a second main bearing 24 fitted in an opposite crankcase gable 26 on the fan wheel side 2.
  • the main bearings 23 and 24, and in particular the first main bearing 23, constitute critical elements in the crankcase design due to the risk of overheating.
  • Crankcase 1 consists of two halves IA and IB, Fig. 6. Both halves IA and IB, that are separately cast, are joined together to one unit by means of a screw fasteners and are in contact with each other in a contact plane 1C.
  • crankcase 1 has double walls in the area of the crankcase chamber 20 on the carburettor side 18, Fig. 6.
  • An inner wall is designated 30 and an outer wall is designated 31.
  • a cooling air duct 32 that extends outside the crankcase chamber 20 within the area of at least essentially the entire part of the carburettor side 18 that is exposed towards the carburettor 15, i.e. that corresponds to the extent of the carburettor.
  • this area has been indicated by broken lines and designated 33.
  • the inner and outer walls of the antechamber 36 are designated 37 and 38 respectively.
  • the inner wall 37 forms an extension of the inner wall 30 of channel 32.
  • An inlet opening 41 in the cover 40 is directed against the direction of air flow in the outlet section 6.
  • the plane of the inlet opening 41, Fig 3 can be, but need not be, essentially perpendicular to the bottom wall of fan scroll 4 in the area of outlet section 6.
  • a couple of side walls extend backwards, curved so that one side 42 connects to the fan wheel's 3 circular curvature and so that the opposite side 43 connects to the widening curvature of the outlet section.
  • the roof 44 of the air inlet cover 40 is initially almost plane and is then curving down towards the bottom wall of outlet section 6.
  • On the roof of the air inlet cover 40 there is a flange 46, that continuously extends in a curvature backwards in the outlet section 6 behind the cover.
  • the cover 40 is bolted in the bottom wall of the outlet section 6.
  • a screw hole in the wall and a seat 45 for the screw head is shown in Fig. 3.
  • the cooling air duct 32 is provided with an outlet opening 50 in the crankcase gable 25 on the clutch side, Fig. 4 and Fig. 6.
  • an evacuation opening 51 is arranged for guiding the cooling air away from the housing 12 on the clutch side, that is covered by the not shown centrifugal clutch, within which area 12 also the outlet opening 50 of the cooling air duct 32 is located.
  • the arc-shaped flange 46 on the roof of the cover and behind the cover 40 is thus contributing to direct the airflow and create desired fan operation in the outlet section for cooling of the cylinder 8.
  • the diverted cooling air flows out through opening 50 in the clutch housing 12 and contributes to cool the centrifugal clutch under the not shown clutch cover and finally leaves the clutch housing 12 through the evacuation opening 51 to be spread into the ambient air.
  • the cooling of the inner wall 30 on the carburettor side contributes to keep the temperature of the crankcase chamber 20 at a moderately high level, with the intent to prevent the main bearings 23 and 24 from overheating.
  • the outer wall 31 in the area of the crankcase chamber 20 has however been continuously cooled by means of cooling air that flows through the cooling air duct 32, which prevents or at least strongly counteracts the heating of the carburettor due to the after-heat from the crankcase while the engine and consequently the fan wheel and its fan blades are at a standstill.
  • the inner wall 30 in the area of the cooling air duct 32 has also been cooled during the operation of the machine, which also counteracts damage particularly to the main bearings 23, 24 due to after-heating during short operational interruptions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un carter (1) pour un moteur à combustion à refroidissement par air pour une machine de travail portative, par exemple une débroussailleuse ou un taille-bordures, qui comprend une chambre de carter (20), un côté volant moteur (2) avec une volute (4) et une roue de ventilateur (3) disposée dans la volute, un côté embrayage (11) opposé au côté volant moteur et un certain nombre de parois de carter entre le côté roue de ventilateur et le côté embrayage. À travers une paroi de carter, au moins sur un côté entre le côté roue de ventilateur et le côté embrayage, un ou plusieurs conduits de refroidissement (32) s'étendent entre une ou plusieurs ouvertures d'entrée (35) pour refroidir l'air dans la volute et une ou plusieurs ouvertures de sortie (50) pour l'air de refroidissement, qui sort dans le boîtier d'embrayage (12), pour le refroidissement de la paroi sur ledit ou lesdits côtés entre le côté roue de ventilateur et le côté embrayage.
EP06812996.4A 2006-11-08 2006-11-08 Carter et moteur à combustion interne Active EP2079919B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2006/001273 WO2008057015A1 (fr) 2006-11-08 2006-11-08 Carter et moteur à combustion interne

Publications (3)

Publication Number Publication Date
EP2079919A1 true EP2079919A1 (fr) 2009-07-22
EP2079919A4 EP2079919A4 (fr) 2010-05-12
EP2079919B1 EP2079919B1 (fr) 2019-01-16

Family

ID=39364750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06812996.4A Active EP2079919B1 (fr) 2006-11-08 2006-11-08 Carter et moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP2079919B1 (fr)
WO (1) WO2008057015A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008003781U1 (de) 2008-03-18 2009-08-13 Dolmar Gmbh Vorrichtung zur Reinigung von Ansaugluft
FR3016396A1 (fr) * 2014-01-13 2015-07-17 Rdmo Corps de pompe integree dans le carter d'un moteur a refroidissement liquide

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE317842C (fr) *
US3747649A (en) * 1971-02-08 1973-07-24 Outboard Marine Corp Crankshaft magneto system
DE19618669A1 (de) * 1996-05-09 1997-11-13 Stihl Maschf Andreas Handgeführtes Arbeitsgerät, insbesondere Freischneider, Motorkettensäge, Trennschleifer oder dergleichen
JPH1077835A (ja) * 1996-08-30 1998-03-24 Fuji Heavy Ind Ltd 空冷エンジンの冷却装置
US6314922B1 (en) * 1998-07-23 2001-11-13 Andreas Stihl Ag & Co. Hand-held working tool
JP3803526B2 (ja) * 2000-03-16 2006-08-02 本田技研工業株式会社 側弁型エンジン
DE10021705B4 (de) * 2000-05-04 2018-01-11 Andreas Stihl Ag & Co. Handgeführtes Arbeitsgerät
JP2002371846A (ja) * 2001-06-15 2002-12-26 Mitsubishi Heavy Ind Ltd 空冷エンジンの冷却装置
JP2004324420A (ja) 2003-04-21 2004-11-18 Kioritz Corp 空冷式４サイクルエンジン

Also Published As

Publication number Publication date
EP2079919A4 (fr) 2010-05-12
WO2008057015A1 (fr) 2008-05-15
EP2079919B1 (fr) 2019-01-16

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