WO2010011163A1 - Dispositif de lubrification dans un moteur à quatre temps - Google Patents

Dispositif de lubrification dans un moteur à quatre temps Download PDF

Info

Publication number
WO2010011163A1
WO2010011163A1 PCT/SE2008/050884 SE2008050884W WO2010011163A1 WO 2010011163 A1 WO2010011163 A1 WO 2010011163A1 SE 2008050884 W SE2008050884 W SE 2008050884W WO 2010011163 A1 WO2010011163 A1 WO 2010011163A1
Authority
WO
WIPO (PCT)
Prior art keywords
room
pipe
engine
lubricant
lubrication device
Prior art date
Application number
PCT/SE2008/050884
Other languages
English (en)
Inventor
Lars Andersson
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
Priority to PCT/SE2008/050884 priority Critical patent/WO2010011163A1/fr
Publication of WO2010011163A1 publication Critical patent/WO2010011163A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/06—Means for keeping lubricant level constant or for accommodating movement or position of machines or engines
    • F01M11/062—Accommodating movement or position of machines or engines, e.g. dry sumps
    • F01M11/065—Position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/04—Pressure lubrication using pressure in working cylinder or crankcase to operate lubricant feeding devices
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication

Definitions

  • the present invention relates to a lubrication device in a four-stroke engine having an engine body including a crank room and a cam room, said lubrication device comprising an lubricant room, which is provided in the engine body, and in which a lubricating oil to be supplied to the crank room and the cam room is intended to be stored up to a predetermined operational level, said cam room and said lubricant room being in communication with each other through an oil return path for returning the lubricating oil from said cam room to said lubricant room, said oil return path having a discharge opening, which is so disposed, that in a normal working position of the engine, said discharge opening is located above the oil level of the lubricating oil within said lubricant room.
  • Lubrication devices of the kind referred to above are disclosed in EP 0 835 987 and US 7 114 483, for example.
  • an oil mist is created by rotary oil slingers that are driven by the engine crankshaft and dip down below the level of the lubricating oil to create the oil mist upon rotation, while in the US '483, air is sucked from the oil reservoir through a pipe having a plurality of small holes, through which oil can seep into the pipe and moisture the air stream in the pipe with oil.
  • the movement of the piston in the engine creates pressure differences that are used to circulate the oil mist to locations that are to be lubricated and return the lubricating oil to the oil reservoir.
  • An expensive oil pump is not required.
  • the object of the present invention is to provide a lubrication device of a simplified but yet reliable design.
  • Fig. 1 is a schematic vertical cross- sectional view of a trimmer engine provided with a preferred embodiment of a lubrication device - shown in detail in Fig. 3 and 4 - in accordance with the present invention
  • Fig. 2 is a vertical cross sectional view of the cam room
  • Fig. 3 is an enlarged view of the bottom portion of Fig. 1;
  • Fig. 4 is a view similar to that in Fig. 3, but illustrating a slightly different embodiment
  • Fig. 5 is an enlarged cross-sectional view similar to that in Fig. 4, but showing the lubrication device when the engine is tilted about 135 degrees;
  • Fig. 6 is an enlarged cross-sectional view similar to that in Fig. 4, but showing the lubrication device when the engine is completely upside down.
  • Fig. 7 is an enlarged cross-sectional view similar to that in Fig. 6, but showing a different embodiment.
  • the four- stroke engine shown in Fig. 1 has an engine body including a crank room 1 and a cam room 2.
  • the crank room 1 is defined by an upper casing 11 having a cylinder body 10 and a lower casing 12.
  • the lower casing 12 is fixed to the cylinder body 10 by bolts so as to form a enclosed a crank room 1, in which a crankshaft 13 is provided.
  • Bearings and seals, not shown, are mounted to two ends of the crankshaft 13 such that the crankshaft 13 is rotatable in the crank room 1.
  • the cylinder body 10 has a top defining a combustion camber 16, in which a piston 17 is mounted to reciprocate, connected to the crankshaft 13 by a connecting rod 18.
  • the cam room 2 houses a cam device 21 and a swing arm mechanism 22 as shown in Fig. 2.
  • the cam device 21 has a camshaft 211 and a cam gear 212, which engages a crankshaft gear 132 on the shaft end 131 of the crankshaft 13, so as to make the camshaft 211 rotate at half the speed of the crankshaft 13.
  • the swing arm mechanism 221 is connected with the camshaft 211. The cooperation between the camshaft 211 and the movement of the piston 17 controls the timely opening and closing of an intake valve and an exhaust valve.
  • the engine also has a lubrication device including a lubricant room 3, which is an enclosed space and is composed of a lubricant tank 30 on the lower casing 12, a bottom casing 31 and a bottom board 32.
  • the lubricating oil 7 is stored up to a pre- determined operational level 70 in the space, and the lubricant tank 30 can be integrally formed with the lower casing 12 of the crank room 1.
  • the movement of the piston 17 in the engine creates pressure differences that are used to circulate the lubricating oil 7 to locations that are to be lubricated, from where the lubricating oil is returned by gravity to the lubricant tank 30.
  • a suction path assembly 9 is located in the lubricant room 3 and has an air inlet 911 located above the level 70 of the lubricating oil 7.
  • the suction path assembly 9 has a plurality of holes 94 defined in a wall of the suction path assembly 9, and irrespective of the temporary tilt of the engine, at least one of the holes 94 is located beneath the level 70 of the lubricating oil 7.
  • the suction path assembly 9 includes a rotary pipe 91, a conduit 92 defined by the bottom casing 31 and the bottom board 32, and a moisture pipe 93.
  • the rotary pipe 91 is pivotal around a central axis of the cylinder body 10 and can rotate 360 degrees due to gravity, when the engine is inclined at various angles.
  • the rotary pipe 91 has a hook portion 912 extending from a side thereof and having a free end with a suction inlet 911 for air, and a plurality of tiny suction holes 94 are defined in the hook portion 912, so that at least one of the suction holes 94 is located beneath the level 70 when at least part of the hook portion 912 is dipped down below the level 70 of the lubricating oil 7. This ensures that the lubrication function is maintained at whichever position the engine takes.
  • the free end of the hook portion 912 where the suction inlet 911 of the rotary pipe 91 is located, extends to a short distance ahead of the rotational axis of the rotary pipe 91, in the alternative embodiment illustrated in Fig. 4, it extends to a short distance past the rotational axis of the rotary pipe 91. Both positions are possible as well as intermediate positions. In a sideways tilted position, i.e. approximately 90 degrees tilt, the fig 3 solution will be closer to the oil level 70 resulting in more oil splashing directly into the suction inlet 911.
  • Figs. 3 and 4 also show that the lubricating oil return path 6 includes a return conduit 952 in the bottom of the lower casing 12 of the crank room 1, and downstream thereof a return pipe 95, so that the lubricating oil enters the lubricant room 3 via the return pipe 95.
  • the return pipe 95 and the rotatable pipe 91 are rotatable on a common rotational axis, and preferably are integral with each other and have a flow blocking member 954, e.g. an internal plug, provided in one of the pipes for preventing flow communication between the return pipe 95 and the rotary pipe 91.
  • a discharge pipe 953 having an oil discharge opening 951 is located at a middle portion of the return pipe 95 and extends outward therefrom toward the hook portion 912 of the rotary pipe 91.
  • a bend of the discharge pipe 953 is such that in the views shown in Figs. 3 and 4, the pipe bends upwards towards the lower casing 12 of the crank room 1.
  • the shape and location of the discharge pipe 953 on the return pipe 95 is such that the discharge opening 951 is located above the oil level 70 in the lubricant room 3 when the engine is in its ordinary working position, but, in accordance with the present invention, below the oil level 70 when the engine is heavily tilted and even turned upside down.
  • the discharge opening 951 is so disposed, that also in a position halfway between the normal working position and the inverted position of the engine, i.e. at appr. 90 degrees tilt, the discharge opening 951 is located below the oil level 70 of the lubricating oil 7 within said lubricant room 3.
  • a preferred distance between the oil discharge opening 951 and the oil level 70 is in the order of 3 mm. When comparing fig 5 and 6 the distance is approximately 6 mm in fig 5 and approximately 1 mm in fig 6.
  • Fig. 7 shows an embodiment with a straight discharge pipe 953 fixed to the return pipe 95 in a position much closer to the lower casing 12.
  • the pipes 912 and 953 can be fixed to each other to provide extra stability, as the free end of 912 can be fixed to 95.
  • An other option would be to raise the oil level when the engine is inverted by having bodies fixed high up to the sides of the lower casing 12, i.e. reducing the marked shoulders in the oil room 3. These bodies could preferably be fixed by the bolts holding the lower casing. More preferably the lubricant tank 30 should be shaped with reduced shoulders from the start.
  • the first and the second way of adapting the position of the discharge opening 951 and the oil level 70 could be combined.
  • the oil return path 6, 95, 953 suitably includes a check valve 955.
  • the oil return path 6, 952, 95, 953 preferably includes a check valve 955.
  • the lubrication device of the present application is applicable primarily to four- stroke engines for hand held products like garden trimmers, hedgetrimmers, blowers, chain saws and the like that are sometimes used in heavily tilted positions. However it could also be used for moderate tilt applications like mowers, scooters, ATVs etc, where it is also desirable to reduce the fuel consumption and pollution as compared to two-stroke engines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

La présente invention concerne un dispositif de lubrification dans un moteur à quatre temps comprenant une chambre à lubrifiant (3), qui est prévue dans le corps du moteur, et dans laquelle une huile de lubrification (7) est destinée à être stockée jusqu'à un niveau opérationnel prédéterminé (70). Une chambre à came (2) et la chambre à lubrifiant (3) sont en communication l'une avec l'autre à travers un trajet de retour d'huile (6) destiné à ramener l'huile de lubrification à la chambre à lubrifiant (3). Le trajet de retour d'huile (6) présente une ouverture d'évacuation (951), qui est disposée de sorte que, dans une position de fonctionnement normal du moteur, elle est située au-dessus du niveau d'huile (70) dans la chambre à lubrifiant (3). Pour fournir un dispositif de lubrification de conception simplifiée mais toujours fiable, l'ouverture d'évacuation (951) est disposée de telle sorte que, dans une position inversée ainsi que dans une position inclinée sur le côté du moteur, dans laquelle la chambre à came (2) est située en dessous de la chambre à lubrifiant (3), l'ouverture d'évacuation (951) est située en dessous du niveau d'huile (70) dans la chambre à lubrifiant (3).
PCT/SE2008/050884 2008-07-22 2008-07-22 Dispositif de lubrification dans un moteur à quatre temps WO2010011163A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2008/050884 WO2010011163A1 (fr) 2008-07-22 2008-07-22 Dispositif de lubrification dans un moteur à quatre temps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2008/050884 WO2010011163A1 (fr) 2008-07-22 2008-07-22 Dispositif de lubrification dans un moteur à quatre temps

Publications (1)

Publication Number Publication Date
WO2010011163A1 true WO2010011163A1 (fr) 2010-01-28

Family

ID=41570483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050884 WO2010011163A1 (fr) 2008-07-22 2008-07-22 Dispositif de lubrification dans un moteur à quatre temps

Country Status (1)

Country Link
WO (1) WO2010011163A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103047043A (zh) * 2013-01-22 2013-04-17 苏州科瓴精密机械科技有限公司 四冲程发动机的凸轮室
WO2013185473A1 (fr) * 2012-06-15 2013-12-19 苏州科瓴精密机械科技有限公司 Système d'alimentation en huile de moteur
US10434677B2 (en) 2017-09-15 2019-10-08 Pilot Pastoral Co. Pty. Ltd. Portable sawmill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5960764A (en) * 1997-03-03 1999-10-05 Kioritz Corporation Four-stroke internal combustion engine
EP0962630A2 (fr) * 1998-06-03 1999-12-08 Fuji Robin Kabushiki Kaisha Dispositif de lubrification d'un moteur à 4 temps
US6863043B2 (en) * 1996-03-08 2005-03-08 Mtd Southwest, Inc. Multi-position, operator-carried, four-cycle engine
US7114483B2 (en) * 2004-06-11 2006-10-03 Shin-Chang Lee Lubrication device for four-stroke engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6863043B2 (en) * 1996-03-08 2005-03-08 Mtd Southwest, Inc. Multi-position, operator-carried, four-cycle engine
US5960764A (en) * 1997-03-03 1999-10-05 Kioritz Corporation Four-stroke internal combustion engine
EP0962630A2 (fr) * 1998-06-03 1999-12-08 Fuji Robin Kabushiki Kaisha Dispositif de lubrification d'un moteur à 4 temps
US7114483B2 (en) * 2004-06-11 2006-10-03 Shin-Chang Lee Lubrication device for four-stroke engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185473A1 (fr) * 2012-06-15 2013-12-19 苏州科瓴精密机械科技有限公司 Système d'alimentation en huile de moteur
CN103511019A (zh) * 2012-06-15 2014-01-15 苏州科瓴精密机械科技有限公司 发动机供油系统
CN103047043A (zh) * 2013-01-22 2013-04-17 苏州科瓴精密机械科技有限公司 四冲程发动机的凸轮室
US10434677B2 (en) 2017-09-15 2019-10-08 Pilot Pastoral Co. Pty. Ltd. Portable sawmill
US10751904B2 (en) 2017-09-15 2020-08-25 Pilot Pastoral Co. Pty. Ltd. Portable sawmill

Similar Documents

Publication Publication Date Title
EP2153030B1 (fr) Système de lubrification pour moteur à quatre temps
EP0835987B1 (fr) Système de lubrification pour un moteur à combustion interne à quatre temps
KR100216246B1 (ko) 4 사이클 엔진의 윤활장치
EP1310638A2 (fr) Système reniflard de carter pour moteur
CN108915816B (zh) 航空用水平对置活塞式发动机的干式润滑系统
JP3462771B2 (ja) エンジンの吸気装置
US7114483B2 (en) Lubrication device for four-stroke engine
WO2010011163A1 (fr) Dispositif de lubrification dans un moteur à quatre temps
US20140096738A1 (en) Engine Lubrication Method
US6167990B1 (en) Lubricating device for four-stroke engine
CN101586488B (zh) 发动机的气缸盖润滑结构
US7080620B2 (en) Crankcase scavenged internal combustion engine
CN103850747B (zh) 四冲程发动机
JPH10288019A (ja) ４サイクルエンジンの潤滑装置
US20150020760A1 (en) Four-cycle Internal Combustion Engine
EP2103786A2 (fr) Appareil de lubrification pour moteurs
JP3402568B2 (ja) ４サイクルエンジン
WO2008150222A1 (fr) Système de lubrification pour moteur à quatre temps
CN201354658Y (zh) 引擎润滑装置
JP2004251231A (ja) ４サイクルエンジンの潤滑装置
CN102434243A (zh) 四冲程发动机的润滑构造
CN211648326U (zh) 一种发动机箱体
TWI388715B (zh) Engine lubrication device
JPH09228816A (ja) ４サイクルエンジンの潤滑装置
CN201176887Y (zh) 引擎润滑装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08876630

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08876630

Country of ref document: EP

Kind code of ref document: A1