WO2008098433A1 - Moteur à arbre à cames auxiliaire - Google Patents

Moteur à arbre à cames auxiliaire Download PDF

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Publication number
WO2008098433A1
WO2008098433A1 PCT/CN2007/001846 CN2007001846W WO2008098433A1 WO 2008098433 A1 WO2008098433 A1 WO 2008098433A1 CN 2007001846 W CN2007001846 W CN 2007001846W WO 2008098433 A1 WO2008098433 A1 WO 2008098433A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
camshaft
exhaust
valve
intake
Prior art date
Application number
PCT/CN2007/001846
Other languages
English (en)
Chinese (zh)
Inventor
Donggao Qian
Original Assignee
Wuxi Southeast Vehicle Technology Co., Ltd
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 Wuxi Southeast Vehicle Technology Co., Ltd filed Critical Wuxi Southeast Vehicle Technology Co., Ltd
Publication of WO2008098433A1 publication Critical patent/WO2008098433A1/fr

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Classifications

    • 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
    • F01L1/053—Camshafts overhead type
    • 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
    • F01L1/185—Overhead end-pivot rocking arms

Definitions

  • This invention relates to cam-type gasoline engines, and more particularly to cam-type gasoline engines in which cams are placed on top of the engine. Background technique
  • the existing overhead cam engine includes a cylinder block, and a lower portion of the cylinder block is connected to the crankcase.
  • the crankshaft is connected to the piston through a connecting rod device; an integrated cylinder head and a cylinder are connected at an upper portion of the cylinder block.
  • the space between the bottom surface of the head and the piston is a combustion chamber, and a valve actuation control device for opening and closing the intake valve, the exhaust valve and both of them is disposed above the combustion chamber at a position of the cylinder head.
  • the valve actuation control device is a cam control device.
  • the camshaft and the cam are mounted on the cylinder head portion. The crankshaft drives the cam to rotate through the transmission device.
  • the cam contacts one end of the rocker arm, and the other end of the rocker arm and the intake valve or
  • the exhaust valve control lever is connected to control the opening or closing of the intake or exhaust valve.
  • the cam control device described above is mounted on the cylinder head and is referred to as an overhead cam engine.
  • U.S. Patent No. 5,706,769 discloses a single cam structure overhead cam engine that shares a single cam mounted to the cylinder head to control the opening and closing of the intake and exhaust valves, a single cam
  • the axis of the cylinder intersects the axis of the cylinder vertically; the center lines of the intake valve and the exhaust valve are parallel to each other, symmetrically and vertically distributed on both sides of the axis of the single cam; the cam faces of the single cam pass through the two rocker arms are respectively Control of opening and closing of intake and exhaust valves.
  • This single-cam cam structure overhead cam engine allows the engine to have a smaller head and also reduces some manufacturing costs.
  • the cam engine of the single cam structure uses a cam to separately control the opening and closing of the intake valve and the exhaust valve, and the single cam has a large working load and a short service life; meanwhile, a cam is used to separately control The opening and closing of the gas valve and the exhaust valve make it difficult to achieve a reasonable valve phase for opening and closing between the intake valve and the exhaust valve, and it is difficult to accurately and timely cooperate with the opening and closing.
  • the cam engine for a single cam structure has a large single working load and is difficult to meet the intake air.
  • the problem of reasonable valve timing requirements for opening and closing of valves and exhaust valves has been improved by the applicant, providing another overhead cam engine with a small cam load and easy access to the intake and exhaust valves. It has a reasonable valve timing when closed, and the head of the engine also has a small lateral dimension.
  • the overhead cam engine includes a cylinder block, the cylinder block is connected to the crankcase, and the crankshaft is connected to the piston through the connecting rod device in the crankcase and the cylinder block; an integrated cylinder head is connected to the upper part of the cylinder block, and the combustion chamber is in the cylinder block
  • An intake valve and an exhaust valve whose center lines are parallel to each other are vertically installed at a position above the cylinder head; a first cam shaft parallel to the crankshaft is mounted between the intake valve and the exhaust valve, the first camshaft
  • the axis of the cylinder is perpendicularly intersected with the central axis of the cylinder block, the upper end of the cylinder head is connected to the bracket body, and the second cam shaft parallel to the crankshaft is mounted on the bracket body, and the first cam and the second cam are respectively mounted on the two cam shafts;
  • the cam faces of the cam and the second cam are respectively in contact with one ends of the two rocker arms, and the other ends of the two rocker arms are respectively in
  • the first camshaft is coupled to the crankshaft by a pulley drive and the second camshaft is coupled to the first camshaft by a sprocket drive.
  • the tensioning device of the transmission chain is a leaf spring, one end of the leaf spring is fastened to the bracket body at the upper end of the cylinder head, and the other end of the leaf spring is elastically bowed on the transmission chain.
  • the opening and closing of the intake valve and the exhaust valve are respectively controlled by the intake cam and the exhaust cam through the rocker arm, that is, controlled by the double cam, effectively reducing the working load of the control cam and improving the control.
  • the working life of the cam Secondly, the two cams respectively control the opening and closing of the intake valve and the exhaust valve, and are easy to adjust and achieve a reasonable valve timing when the intake valve and the exhaust wide open and close.
  • the intake valve and the exhaust valve are parallel to each other and vertically mounted to the cylinder head, and the exhaust camshaft and the exhaust cam are installed between the intake valve and the exhaust valve, and the intake camshaft and the intake cam are mounted on the cylinder
  • the bracket body on the upper part of the head effectively reduces the lateral dimension of the cylinder head.
  • Figure 1 is a cross-sectional view showing the structure of the present invention, taken along the line A-A of Figure 2;
  • Figure 2 is a cross-sectional view taken along line B- B of Figure 1;
  • Figure 3 is a cross-sectional view taken along line C-C of Figure 1;
  • the present invention includes a cylinder block 1.
  • the lower portion of the cylinder block 1 is connected to a crankcase.
  • the crankshaft 3 is connected to the piston 5 through a connecting rod device;
  • the cylinder block 1 includes a cylinder outer wall 1-1.
  • the cylinder sleeve 1-5 integrally molded with the same, the bearing bush 1-3 is pressed on the outer wall 1-1 of the cylinder, and the inclined surface 1-4 of the cylinder block 1 is combined with the inclined surface 2-2 of the oil base 2 to form a crankcase.
  • a screw 15 connected to the upper part of the cylinder block 1 with a cylinder head 1-2;
  • the two shaft diameters 3-1 and 3-2 of the crankshaft 3 are respectively supported on the bearing pads 1-3 of the cylinder block 1 and the bearing pads 2-1 of the oil base 2; the flywheel 16 is fixed to one end of the crankshaft 3 in a conventional manner;
  • piston 5 can reciprocate in the cylinder liner 1-5; the combustion chamber 16 is defined as the portion between the piston 5 and the bottom surface of the cylinder head 1-2.
  • a large number of fins are distributed on the outer wall 1-1 of the cylinder.
  • the intake valve 7 is in contact with the intake valve seat 9 to control the opening and closing of the intake port, and the intake port extends from the intake valve seat 9 to a side of the cylinder head 17
  • the side surface 17 is connected to the heat shield 22 of the carburetor, the heat shield 22 is connected to the carburetor 20, and the carburetor 20 is connected to the air cleaner 21 to form a fuel mixture formation and supply system; 8 is in contact with the exhaust wide seat 10 to control the opening and closing of the exhaust passage.
  • the exhaust passage extends from the exhaust valve seat ring 10 to the other side 18 of the cylinder head, and the side surface 18 is connected to the muffler 19 to constitute Exhaust gas removal and shutdown system.
  • the intake valve 7 and the exhaust valve 8 are vertically mounted to the cylinder head 1-2 above the combustion chamber 16 in the cylinder block, and the center lines of the two are parallel to each other and distributed in the center of the cylinder.
  • valve control rod of the intake valve 7 reciprocates up and down along the intake valve guide sleeve 23
  • valve control rod of the exhaust valve 8 reciprocates up and down along the exhaust valve guide sleeve 24
  • the intake valve 7 A valve spring 25 and a spring retainer 26 are attached to the upper portions of the valve control lever of the valve control lever and the exhaust valve 8, respectively.
  • One end of the valve spring 25 is mounted on the cylinder head 1-2, and the other end is fitted into the spring seat 26.
  • the spring seat 26 is seated in the slot of the valve control lever, and the valve spring 25 biases the spring seat 26 away from the closing direction.
  • the screw port of the spark plug 27 is mounted on the cylinder block above the combustion chamber 16, on the side of the intake valve 7 and the exhaust valve 8.
  • the exhaust camshaft 28 is a first camshaft mounted on the cylinder head 1-2 between the intake air and the exhaust air, and the axis of the exhaust camshaft 28 is parallel to the axis of the crankshaft 3. And intersect perpendicular to the cylinder center axis.
  • An exhaust cam assembly 29 is mounted on the exhaust camshaft 28, and the driven pulley 29-1, the exhaust cam 29-2 as the first cam, and the drive sprocket 29-3 are fastened together on a sleeve to form a row.
  • An air cam assembly 29, the sleeve sleeve is mounted on the exhaust camshaft 28,
  • the exhaust cam assembly 29 is rotatable about the exhaust camshaft 28 by a bushing that is stationary.
  • the exhaust cam assembly 29 is composed of different materials.
  • the driven pulley 29-1 is made of phenolic plastic, the exhaust cam 29-2 is made of metal, and the drive sprocket 29-3 is also made of metal.
  • the exhaust camshaft 28 is connected to the crankshaft 3 via a pulley transmission, and the pulley transmission is simultaneously used as a governor, which is composed of a timing belt 30, a drive pulley 31 and a driven pulley 29-1.
  • the driving pulley 31 cooperates with the crankshaft, and the crankshaft drives the driving pulley 31 to rotate.
  • the timing belt 30 drives the exhaust cam assembly 29 to rotate.
  • the speed of the exhaust cam assembly 29 is 1/2 of the crankshaft 3 rotation speed, and the rotation direction is the same.
  • the upper end of the cylinder head 1-2 is connected to the bracket body 32, and the intake camshaft 33 as the second camshaft is mounted on the bracket body 32, and the axes of the intake camshaft 33 are parallel to the crankshaft 3 and the row, respectively.
  • the axis of the air camshaft 28, see Fig. 2, the axis of the intake camshaft 33 is offset from the central axis of the cylinder block.
  • an intake cam combination 34 is mounted on the intake camshaft 33.
  • the intake cam assembly 34 includes an intake cam 34-1 and a driven sprocket 34-2.
  • the driving sprocket 29-3 is connected to the driven sprocket 34-2 via the chain 35.
  • the speed ratio of the driven sprocket 34-2 to the driving sprocket 29-3 is 1:1, and the intake camshaft 33 is transmitted through the sprocket.
  • the device is coupled to an exhaust camshaft 28 that is rotatable on the intake camshaft 33.
  • the intake valve rocker arm 11 and the exhaust valve rocker arm 12 are mounted on the cylinder head 1-2 through the intake valve rocker arm shaft 36 and the exhaust valve rocker arm shaft 37, respectively.
  • the hub is distributed on both sides of the exhaust camshaft 28, and the intake valve rocker arm 11 and the exhaust valve rocker arm 12 are rotatable on the intake valve rocker arm shaft 36 and the exhaust valve rocker arm shaft 37, respectively.
  • the intake valve rocker arm 11 and the exhaust valve rocker arm 12 each have two crank arms, and one end of the two crank arms is respectively provided with a valve adjusting screw 13 and a lock nut 14 thereof.
  • the arc surface of the lower end portion of the adjusting screw 13 is in contact with the upper end portions of the valve control rods of the intake valve 7 and the exhaust valve 8, respectively; the curved surface of the end of the other crank arm of the exhausting rocker arm 12 and the exhaust cam
  • the cam surface of 29-2 is in contact; the curved surface of the other crank arm end of the intake valve rocker arm 11 is in contact with the cam surface of the intake cam 34-1.
  • the rotation of the intake cam 34-1 and the exhaust cam 29-2 respectively drives the intake valve rocker arm 11 and the exhaust valve rocker arm 12 by the crank arm, thereby being controlled by the adjusting screw 13 thereon.
  • the gas valve 7 and the exhaust valve 8 are opened or closed.
  • the tensioning device of the transmission chain 35 is a leaf spring 38, and one end of the leaf spring 38 is fastened to the bracket body 32 at the upper end of the cylinder head, the leaf spring 38 The other end is arcuate, and the elastic bow is placed on the drive chain 35.
  • the above is the preferred embodiment of the invention.
  • the present invention can be applied to an air-cooled single-cylinder engine. Of course, it can also be used for an air-cooled multi-cylinder, a water-cooled single-cylinder, and a multi-cylinder engine. Further, in the above embodiment, the cylinder head and the cylinder block are integrally formed, but they may be independently formed. As a further embodiment, the present invention is also applicable to mounting an intake camshaft and an intake cam on a cylinder head 1-2, and an exhaust camshaft and an exhaust cam are mounted on the bracket body 32.
  • the invention is applicable to an engine for a lawn mower and to other engines for related purposes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un moteur à arbre à cames auxiliaire comprenant un corps de cylindre (1), une tête de cylindre (1-2) et un carter, une bielle (4) raccordant une manivelle (3) à un piston (5); une soupape d'admission (7) et une soupape d'échappement (8) étant montées perpendiculairement sur la tête de cylindre, la soupape d'admission étant parallèle à la soupape d'échappement, un arbre à cames d'échappement (28) et une came d'échappement (29-2) sont montés entre la soupape d'admission et la soupape d'échappement, un corps de boîtier (32) est raccordé à l'extrémité supérieure de la tête de cylindre, un arbre à cames d'admission et une came d'échappement sont montés sur le corps du boîtier, l'arbre à cames d'échappement et la surface de l'arbre de l'arbre à cames d'admission commandent séparément l'ouverture et la fermeture de la soupape d'admission et de la soupape d'échappement par le biais d'un culbuteur (30,42), l'arbre à cames d'échappement est raccordé à la manivelle par le biais d'une transmission (30) et l'arbre à came d'admission est raccordé à l'arbre à cames d'échappement par le biais d'une transmission.
PCT/CN2007/001846 2007-02-14 2007-06-11 Moteur à arbre à cames auxiliaire WO2008098433A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710020334.5 2007-02-14
CNA2007100203345A CN101012760A (zh) 2007-02-14 2007-02-14 顶置式凸轮发动机

Publications (1)

Publication Number Publication Date
WO2008098433A1 true WO2008098433A1 (fr) 2008-08-21

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ID=38700467

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/001846 WO2008098433A1 (fr) 2007-02-14 2007-06-11 Moteur à arbre à cames auxiliaire

Country Status (2)

Country Link
CN (1) CN101012760A (fr)
WO (1) WO2008098433A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105569755A (zh) * 2016-02-03 2016-05-11 天津内燃机研究所 一种摩托车发动机的配气机构
EP3779163B1 (fr) * 2018-03-30 2023-07-12 Honda Motor Co., Ltd. Moteur
CN109209632A (zh) * 2018-11-16 2019-01-15 凤台县瑞普农业发展有限公司 一种沼气发电机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0598918A (ja) * 1991-10-08 1993-04-20 Yukio Watanabe タイミング可変型バルブ駆動機構
US5427065A (en) * 1992-12-08 1995-06-27 Yamaha Hatsudoki Kabushiki Kaisha Valve operating mechanism for 4-cycle engine
CN1338033A (zh) * 1999-11-24 2002-02-27 本田技研工业株式会社 张紧装置
US6408808B1 (en) * 1999-10-18 2002-06-25 Hyundai Motor Company DOHC diesel engine cylinder head
US6425359B2 (en) * 2000-06-23 2002-07-30 Honda Giken Kogyo Kabushiki Kaisha Valve moving apparatus of an internal combustion engine
US20040237918A1 (en) * 2000-09-29 2004-12-02 Mendler Edward Charles Valve control apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0598918A (ja) * 1991-10-08 1993-04-20 Yukio Watanabe タイミング可変型バルブ駆動機構
US5427065A (en) * 1992-12-08 1995-06-27 Yamaha Hatsudoki Kabushiki Kaisha Valve operating mechanism for 4-cycle engine
US6408808B1 (en) * 1999-10-18 2002-06-25 Hyundai Motor Company DOHC diesel engine cylinder head
CN1338033A (zh) * 1999-11-24 2002-02-27 本田技研工业株式会社 张紧装置
US6425359B2 (en) * 2000-06-23 2002-07-30 Honda Giken Kogyo Kabushiki Kaisha Valve moving apparatus of an internal combustion engine
US20040237918A1 (en) * 2000-09-29 2004-12-02 Mendler Edward Charles Valve control apparatus

Also Published As

Publication number Publication date
CN101012760A (zh) 2007-08-08

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