CN1495342A - OHC overhead camshaft internal combustion enjine - Google Patents

OHC overhead camshaft internal combustion enjine Download PDF

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Publication number
CN1495342A
CN1495342A CNA031588549A CN03158854A CN1495342A CN 1495342 A CN1495342 A CN 1495342A CN A031588549 A CNA031588549 A CN A031588549A CN 03158854 A CN03158854 A CN 03158854A CN 1495342 A CN1495342 A CN 1495342A
Authority
CN
China
Prior art keywords
camshaft
cylinder head
holder
camshaft holder
combustion engine
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
CNA031588549A
Other languages
Chinese (zh)
Other versions
CN1291136C (en
Inventor
神户敬司
一
俵田雄一
康
佐藤智康
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor 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
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Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of CN1495342A publication Critical patent/CN1495342A/en
Application granted granted Critical
Publication of CN1291136C publication Critical patent/CN1291136C/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F01L1/02—Valve drive
    • 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
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L1/06—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like the cams, or the like, rotating at a higher speed than that corresponding to the valve cycle, e.g. operating fourstroke engine valves directly from crankshaft
    • 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
    • F01L5/00—Slide valve-gear or valve-arrangements
    • F01L5/14—Slide valve-gear or valve-arrangements characterised by the provision of valves with reciprocating and other movements
    • F01L5/18—Slide valve-gear or valve-arrangements characterised by the provision of valves with reciprocating and other movements with reciprocatory valve and other slide valve
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads

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  • 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

To improve conventional structure that takes a lot of man-hours in manufacture since halved camshaft bearing holding parts are formed by using joint faces of separately produced members such as a cylinder head cover and a cylinder head to facilitate production of a bearing holding part and installation work of a camshaft, in an OHC type internal combustion engine whose rotating camshaft interlocked with a crankshaft is disposed on a cylinder head. A camshaft holder for holding the camshaft to be rotatable is produced separately from the cylinder head or cylinder head cover, and the camshaft holder is tightened together by stud bolts passing through a cylinder.

Description

OHC overhead camshaft type internal-combustion engine
Technical field
The present invention relates to camshaft is provided with OHC overhead camshaft type internal-combustion engine on the cylinder head, particularly relate to can the free rotary ground supporting camshaft structure.
Background technique
Present camshaft supporting structure is to form the bearing support of two halves shape up and down between the junction plane of valve mechanism cover and cylinder head, can rotate freely (for example with reference to patent documentation 1) by rolling bearing supporting camshaft.
As other camshaft supporting structure, the camshaft upper support body that separates with valve mechanism cover is set, between the junction plane of this camshaft upper support body and cylinder head, form the bearing support of two halves shape up and down, can rotate freely by rolling bearing supporting camshaft.Valve mechanism cover is installed on the cylinder head to cover their (for example with reference to patent documentations 2) after the valve driving mechanism that comprises camshaft is installed.
Patent documentation 1
Real fair 2-16002 communique (first figure)
Patent documentation 2
Real public clear 57-45387 communique (first figure).
Present technology is to form the bearing support of two halves shape up and down between the junction plane of valve mechanism cover and cylinder head or between the junction plane of camshaft upper support body and cylinder head.In order on the junction plane of this parts of making respectively, to form bearing support, need once the involutory assembling of junction plane to be worn the machining bearing support to it, again the operation that it is separately bothered like this.Need be installed in camshaft the operation of assembling the opposite side parts again behind the recess of a side component that has formed the two halves shapes by bearing during assembling.
Summary of the invention
The present invention is for eliminating the above-mentioned shortcoming of present technology, do not need now such bearing support that on the junction plane of the member of making respectively, forms the two halves shape, and by valve mechanism cover and with valve mechanism cover camshaft holder block bearing independently, make the fitting operation of the making of bearing support and camshaft easy.
For solving above-mentioned problem, in the OHC type internal-combustion engine of first aspect present invention the camshaft with the rotation of bent axle interlock is arranged on the cylinder head, separate making with described cylinder head, it is fastening fixing with the stud bolt that connects cylinder to support the camshaft holder that described camshaft rotates freely.
In sum, the present invention separates with cylinder head and makes camshaft holder, thus do not need the bearing support of the shape of two halves up and down that such formation now makes trouble, and can form the bearing support of the easy shape of making.In addition, fastening fixing with the stud bolt that connects cylinder camshaft holder, so can firmly fix.
Second aspect present invention is in the described OHC type of first aspect present invention internal-combustion engine the pitman arm shaft support to be integrally formed on the described camshaft holder, and the restraint location of described camshaft holder is on described pitman arm shaft support.
Like this, owing to integrally formed pitman arm shaft support on camshaft holder, so can simply carry out the installation of camshaft and the installation of pitman arm shaft with series-operation.In addition, because the camshaft holder thermal expansion of making of aluminum alloy is big, so below the pitman arm shaft support fixedly the time, interval variation by thermal expansion camshaft and pitman arm shaft; the position of rocking arm is inaccurate; produce the tappet clearance and become the big fault that waits, but the restraint location of camshaft holder fix on the pitman arm shaft support above, so do not produce this fault.
Description of drawings
Fig. 1 is the figure that sees the automobile-used OHC type of one embodiment of the invention two-wheel single-cylinder engine critical piece cross section from behind;
Fig. 2 is the figure that sees the longitudinal section of the suction air valve that is located at described internal-combustion engine top and valve driving mechanism from the right side;
Fig. 3 is a horizontal sectional drawing of seeing described internal combustion engine valve chamber interior from above;
Fig. 4 is the planimetric map of camshaft holder;
Fig. 5 is the V-V sectional drawing of Fig. 4;
Fig. 6 is the VI-VI sectional drawing of Fig. 4;
Fig. 7 is the VII-VII sectional drawing of Fig. 4;
Fig. 8 is the figure that sees camshaft holder assembly department longitudinal section from the right side.
Embodiment
Fig. 1 is the figure that sees the automobile-used OHC type of one embodiment of the invention two-wheel single-cylinder engine critical piece cross section from behind.The shell of this internal-combustion engine is made of left crankcase 1, right crankcase 2, left crankcase cover 3, right crankcase cover 4, cylinder block 5, cylinder head 6, valve mechanism cover 7 among the figure.Bent axle 8 by about part constitute with crankpin 9 and constitute one.Bent axle 8 can be rotated to support on respectively on left crankcase 1 and the right crankcase 2 by rolling bearing 10,11.Be connected on the crankpin 9 by connecting rod 12 pistons 13, this piston moves up and down in cylinder block 5.Below cylinder head 6, be formed with firing chamber 14.Ignition spark plug 15 is installed on the cylinder head 6, and its front-end face is facing to described firing chamber 14.
The camshaft 22 of valve driving mechanism can be rotated to support on the camshaft holder 21 in the valve chamber be located between cylinder head 6 and the valve mechanism cover 7 20.Be provided with the cam chain chamber 23 that penetrates into the inside of left crankcase 1 from the space, left part of camshaft 22 in the left side of internal-combustion engine.Driving sprocket wheel 24 is inlaid in the left part of bent axle 8, and driven sprocket 25 is fixed on the left part of camshaft 22, and cam chain 26 is around hanging on these two sprocket wheels.Like this, the rotating power of bent axle 8 is passed to camshaft 22, the described later suction air valve of time driving device on cylinder head 6 that can be in accordance with regulations.
Fig. 2 is the figure that sees the longitudinal section of the suction air valve that is located at described internal-combustion engine top and valve driving mechanism from the right side, arrow F directed forward.The relief opening 27 and the intakeport 29 that link to each other with firing chamber 14 among the figure are formed on the cylinder head 6.Medial extremity at relief opening 27 is provided with the outlet valve 28 that opens and closes this path.Diagram abridged outlet pipe is connected the outboard end of relief opening 27.Medial extremity at intakeport 29 is provided with the Aspirating valves 30 that opens and closes this path.Diagram abridged vaporizer is connected the outboard end of intakeport 29.
Outlet valve 28 is arranged to its axial region 28a and is leaned forward at the forward place of cylinder head 6, is equipped with outlet valve 28 to the pressured valve spring 31 of closing direction at the top of axial region 28a protuberance.Aspirating valves 30 is arranged to its axial region 30a and is located hypsokinesis in the back of leaning on of cylinder head 6, is equipped with Aspirating valves 30 to the pressured valve spring 32 of closing direction at the top of axial region 30a protuberance.
Fig. 3 is a horizontal sectional drawing of seeing valve chamber 20 inside from above, arrow F directed forward.Following explanation is with reference to Fig. 2 and Fig. 3 narration.Form valve chambers 20 with cylinder head 6 and valve mechanism cover 7, camshaft 22 and the valve driving mechanism that opens and closes described outlet valve 28 and Aspirating valves 30 by folding and unfolding at this.Can be rotated to support on the camshaft holder 21 at camshaft 22 by relative internal-combustion engine fore-and-aft direction quadrature in outlet valve 28 and the V figure space that Aspirating valves 30 forms.Camshaft holder 21 is the integral member that possess left part 21a, right side part 21b, anterior connecting part 21c, rear portion connecting part 21d as described later.Fig. 3 can see the left part 21a and the right side part 21b of camshaft holder 21.Being formed with the exhaust that drives outlet valve 28 switchings on the camshaft 22 that is supported by camshaft holder 21 uses cam 34 and drives the air-breathing cam 35 of using that Aspirating valves 30 opens and closes.
Exhaust is deflated with pitman arm shaft 37 and can joltily supports with rocking arm 36 above outlet valve 28, the one end contacts with the upper end 28b of outlet valve axial region 28a by tappet 38, and the other end contacts with cam 34 with exhaust with roller 40 by the exhaust that is bearing on the roller shaft 39.Air-breathingly above Aspirating valves 30 can joltily be supported with pitman arm shaft 42 by air-breathing with Rocker arm 41, the one end contacts with the upper end 30b of Aspirating valves axial region 30a by tappet 43, and the other end contacts with cam 35 with air-breathing by the air-breathing roller 45 of using that is bearing on the roller shaft 44.Because valve driving mechanism is above-mentioned this structure, so can open and close the suction air valve with scheduled time according to the rotation of camshaft 22.Only illustrate pitman arm shaft 37, roller shaft 39, air-breathing center line among Fig. 3 with pitman arm shaft 42, roller shaft 44, attached with symbol on center line.
Fig. 4 is the planimetric map of camshaft holder 21, and Fig. 5 is the V-V sectional drawing of Fig. 4, and Fig. 6 is the VI-VI sectional drawing of Fig. 4, and Fig. 7 is the VII-VII sectional drawing of Fig. 4.Camshaft holder 21 is the integral member that are made of left part 21a, right side part 21b, anterior connecting part 21c and rear portion connecting part 21d.Be respectively equipped with camshaft supporting hole 46, exhaust that they are connected pitman arm shaft bearing hole 47 and air-breathing on left part 21a and the right side part 21b point-blank with pitman arm shaft bearing hole 48.The symbol of indication window position is attached on the center line in hole.Support each by them.Camshaft 22 is supported in the described camshaft supporting hole 46 by rolling bearing.Pitman arm shaft the 37, the 42nd, stationary axle, rocking arm 36,41 shake around this stationary axle.Because the structure of the not now this two halves of axle bearing hole of this camshaft holder 21, so insert vehicle body frame from the next door of camshaft holder one side.Be provided with long size shape nut insertion hole 49 in four places in this member bight.
Fig. 8 is the figure that sees the internal-combustion engine longitudinal section of expression camshaft holder 21 mounting constructions from the right side, and camshaft holder 21 has been represented the section of left part 21a.Arrow F directed forward.Camshaft supporting hole 46, exhaust pitman arm shaft bearing hole 47, air-breathing on the left part 21a of described camshaft holder, have been represented with pitman arm shaft bearing hole 48.
Embed two stud bolts 50 on left crankcase 1, the stud bolt patchhole 53 of cylinder block sidepiece and the stud bolt patchhole 54 of cylinder head sidepiece are inserted in the top of stud bolt 50.Same with Fig. 8, (omitting among the figure) also embeds two stud bolts 50 on the right crankcase on internal-combustion engine right side, inserts the stud bolt patchhole on cylinder block 5 and cylinder head 6 right sides.
Camshaft holder 21 is placed on the cylinder head with above-mentioned state, screws respectively on the outside thread that is fastened on described four stud bolt 50 heads being inserted in four long size cover shape nuts 51 in the local long size cover shape nut insertion hole 49.Fastening face is the top promptly at the upside of pitman arm shaft support of camshaft holder.Between the head of the top and long size cover shape nut 51 of camshaft holder 21 packing ring 52 is housed.Again valve mechanism cover 7 is installed on the cylinder head 6 after the installation of these valve driving mechanisms.
In sum, in the air-cooled internal combustion engine of present embodiment relatively cylinder head use camshaft holder separately, do not adopt the two halves structure, by the camshaft supporting mode of simple circular hole, so the making of axle support easily and also the fitting operation of axle also easy.
Integrally formed pitman arm shaft support on camshaft holder is so can simply carry out the installation of camshaft and the installation of pitman arm shaft with series-operation.
Since the restraint location of camshaft holder at the pitman arm shaft support at upside, so do not produce the fault of rocking arm position push rod clearance variation inaccurate and that therefore cause that thermal expansion causes etc.

Claims (2)

1, a kind of OHC type internal-combustion engine, its camshaft with the rotation of bent axle interlock is arranged on the cylinder head, it is characterized in that, and the camshaft holder that the described camshaft of supporting is rotated freely separates making with described cylinder head, and is fastening fixing with the stud bolt that connects cylinder.
2, OHC type internal-combustion engine as claimed in claim 1 is characterized in that, the pitman arm shaft support is integrally formed on the described camshaft holder, and the restraint location of described camshaft holder is on described pitman arm shaft support.
CNB031588549A 2002-09-24 2003-09-15 OHC overhead camshaft internal combustion enjine Ceased CN1291136C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002276926A JP4014037B2 (en) 2002-09-24 2002-09-24 OHC internal combustion engine
JP276926/02 2002-09-24
JP276926/2002 2002-09-24

Publications (2)

Publication Number Publication Date
CN1495342A true CN1495342A (en) 2004-05-12
CN1291136C CN1291136C (en) 2006-12-20

Family

ID=32272665

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB031588549A Ceased CN1291136C (en) 2002-09-24 2003-09-15 OHC overhead camshaft internal combustion enjine

Country Status (6)

Country Link
JP (1) JP4014037B2 (en)
KR (2) KR20040026600A (en)
CN (1) CN1291136C (en)
BR (1) BR0304158B1 (en)
MX (1) MXPA03008263A (en)
TW (1) TWI251637B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104061032A (en) * 2013-03-22 2014-09-24 马勒国际有限公司 Bearing Frame Or Cylinder Head Cover Of An Internal Combustion Engine
CN108350763A (en) * 2015-11-09 2018-07-31 五十铃自动车株式会社 The cylinder head structure and internal combustion engine of internal combustion engine
CN110725726A (en) * 2018-07-16 2020-01-24 卡特彼勒公司 Valve train pivot bracket assembly with multi-function cover
CN114856745A (en) * 2017-08-18 2022-08-05 曼卡车和巴士欧洲股份公司 Device for rotatably mounting a camshaft

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007024092A1 (en) 2007-05-22 2008-11-27 Mahle International Gmbh camshaft
JP2009097487A (en) * 2007-10-19 2009-05-07 Honda Motor Co Ltd Valve gear for overhead cam shaft type internal combustion engine
DE102014211638A1 (en) * 2014-06-18 2015-12-24 Schaeffler Technologies AG & Co. KG carrier module

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104061032A (en) * 2013-03-22 2014-09-24 马勒国际有限公司 Bearing Frame Or Cylinder Head Cover Of An Internal Combustion Engine
CN104061032B (en) * 2013-03-22 2017-10-24 马勒国际有限公司 The bearing support or valve mechanism cover of internal combustion engine
CN108350763A (en) * 2015-11-09 2018-07-31 五十铃自动车株式会社 The cylinder head structure and internal combustion engine of internal combustion engine
US10690015B2 (en) 2015-11-09 2020-06-23 Isuzu Motors Limited Cylinder head structure for internal combustion engine and internal combustion engine
CN114856745A (en) * 2017-08-18 2022-08-05 曼卡车和巴士欧洲股份公司 Device for rotatably mounting a camshaft
CN110725726A (en) * 2018-07-16 2020-01-24 卡特彼勒公司 Valve train pivot bracket assembly with multi-function cover
CN110725726B (en) * 2018-07-16 2023-03-14 卡特彼勒公司 Valve train pivot bracket assembly with multi-functional cover

Also Published As

Publication number Publication date
JP4014037B2 (en) 2007-11-28
TWI251637B (en) 2006-03-21
BR0304158B1 (en) 2012-08-07
CN1291136C (en) 2006-12-20
MXPA03008263A (en) 2004-09-03
BR0304158A (en) 2004-09-08
KR20040026600A (en) 2004-03-31
KR20050115217A (en) 2005-12-07
JP2004116297A (en) 2004-04-15
TW200404945A (en) 2004-04-01

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