CN1530566A - IC engine structure for preventing cam chain drop - Google Patents
IC engine structure for preventing cam chain drop Download PDFInfo
- Publication number
- CN1530566A CN1530566A CNA2004100283007A CN200410028300A CN1530566A CN 1530566 A CN1530566 A CN 1530566A CN A2004100283007 A CNA2004100283007 A CN A2004100283007A CN 200410028300 A CN200410028300 A CN 200410028300A CN 1530566 A CN1530566 A CN 1530566A
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- Prior art keywords
- cam chain
- chain
- rolling bearing
- cam
- base end
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Abstract
To reduce the number of part items, to reduce assembling work, and to improve productivity in a cam chain falling-off preventing structure of an internal combustion engine for rotatably journaling a crankshaft to a crankcase via a rolling bearing, and arranging a cam chain falling-off preventing plate extended to this part in the peripheral part of a driving sprocket of a valve system fitted to the crankshaft.One member is constituted for also serving as the cam chain falling-off preventing plate, a chain guide base end part presser member of a cam tensioner, and a crankshaft rolling bearing shaft directional movement regulating member. These respective parts are integrally formed. (C)2005,JPO&NCIPI.
Description
Technical field
The present invention relates to prevent the structure that the cam chain of the valve driving system of Otto (cycle) engine comes off.
Background technique
In Otto (cycle) engine,, use cam chain as the parts that transmit the rotating drive power of bent axle to the camshaft of valve drive mechanism in order periodically to drive the suction and discharge valve that is arranged in the cylinder head.Cam chain hangs on driving sprocket wheel and the driven sprocket, and driving sprocket wheel is inlaid on the bent axle, driven sprocket is inlaid on the camshaft.
Draw in side at cam chain by driving sprocket wheel fixed chain guide apparatus is set; At opposite side, promptly cam chain is sent side from driving sprocket wheel cam chain tension means is set, and it is made up of stretcher and rotary type chain guide apparatus.Cam chain tension means by stretcher chain guide apparatus by pressing to chain, prevent that like this cam chain of valve driving system is lax.The structure of this cam chain tension means chain guide apparatus is to support and rotatable with the base end part pivot, and the chain guide apparatus cardinal extremity pressing component by the donut shape, keeps and being threaded of pivot end with nut, prevents disengagement.(for example, with reference to patent documentation 1).
In addition, chain releasing in order to prevent to assemble internal-combustion engine is provided with on the driving sprocket wheel that the cam chain volume is hung and prevents the cam chain plate that comes off.Prevent that the cam chain plate that comes off from being another parts (for example, with reference to patent document 2) that the base end part pressing component with the chain guide apparatus of above-mentioned cam chain tension means separates.
In addition, the plate that moves along the axis of bent axle of the restriction rolling bearing of the supporting bent axle side of being close to the overcoat of above-mentioned rolling bearing is fixed in the crankcase.The plate that above-mentioned restriction rolling bearing moves along crankshaft center line is and the chain guide apparatus base end part pressing component of above-mentioned cam chain tension means and above-mentioned another parts (for example, with reference to patent documentation 3) that prevent cam chain to come off plate separates.
[patent documentation 1] real clear 60-32501 communique (Fig. 1) of opening;
[patent documentation 2] spy opens 2000-303906 communique (Fig. 6, Figure 18, Figure 22);
[patent documentation 3] spy opens flat 10-238600 communique (Fig. 7)
Summary of the invention
The present invention forms with a parts double as and prevents the cam chain chain guide apparatus base end part pressing component of plate and cam chain tension means and the restriction bent axle rolling bearing structure along the axis moving member that comes off, seek to cut down the part number, reduce the assembling operation amount, thereby enhance productivity.
The invention solves above-mentioned problem, the present invention is that a kind of internal-combustion engine prevents the cam chain dropping structure, in this structure, bent axle rotates by rolling bearing and is supported on freely in the crankcase, is provided with around the driving sprocket wheel that is inlaid in the valve driving system on this bent axle and prevents to hang over the plate that the cam chain on the driving sprocket wheel comes off; Above-mentioned prevent cam chain come off plate and the base end part of the chain guide apparatus of the cam chain tension means of pushing above-mentioned cam chain pressing component and limit the parts that above-mentioned rolling bearing crankshaft center line moves and form one.
Because the present invention so constitutes, so finished three functions with parts, has realized minimizing number of spare parts and assembling operation amount, therefore improved manufacturing efficiency.
Description of drawings
Fig. 1 be vehicle-mounted state from above see the drawing in side sectional elevation of the main portion of the motorcycle-use Otto (cycle) engine that relates to one embodiment of the invention;
Fig. 2 is a sectional arrangement drawing of seeing the main portion of the cam chain chamber by above-mentioned internal-combustion engine at vehicle-mounted state from left;
Fig. 3 is the figure of the base end part of arm;
Fig. 4 is the figure of the base end part of chute;
Fig. 5 is the figure of base end part of the chain guide apparatus of arm and chute combination;
Fig. 6 prevents the come off figure of plate of cam chain, and Fig. 6 (a) is a plan view, and Fig. 6 (b) is the B-B sectional drawing of Fig. 6 (a), and Fig. 6 (c) is the C-C sectional drawing of Fig. 6 (a);
Fig. 7 is near the amplification sectional arrangement drawing of cam chain driving sprocket wheel of above-mentioned internal-combustion engine;
Fig. 8 is the VIII-VIII sectional drawing of Fig. 7;
Fig. 9 is the IX-IX sectional drawing of Fig. 7.
The unit number explanation
1～left crankcase, 2～right crankcase, 3～left crankcase lid, 4～right crankcase cover, 5～cylinder block, 6～cylinder head, 7～cylinder head cover, 8～bent axle, 9～crankpin, 10～rolling bearing, the overcoat of 10a～rolling bearing 10,11～rolling bearing, 12～connecting rod, 13～piston, 14～firing chamber, 16～camshaft, 17～cam chain chamber, 18～driving sprocket wheel, 19～driven sprocket, 20～cam chain, 21～chain guide apparatus, 22～chain tensioning device, 23～stretcher, 24～chain guide apparatus, 24a～chain guide apparatus base end part, 25～arm, 25a～arm base end part, 26～chute, 26a～chute base end part, 27～pivot reach through hole, 28～pivot, 30～prevent the cam chain plate that comes off, 30a～main part, 30b～bolt hole, 30c～bolt hole, 30d～chain guide apparatus cardinal extremity press part, 30e～pivot reach through hole, 30f～bent axle rolling bearing movement limiting portion, 30g～the prevent cam chain portion that comes off, 31～bolt, 32～bolt, 35～alternator, 36～starting clutch, 37～speed change switch clutch, 38～transmission gear group, 39～water pump, 40～actuating motor, 41～gear, 42～gear, 43～overrunning clutch
Embodiment
Fig. 1 be vehicle-mounted state from above see the drawing in side sectional elevation of the main portion of the motorcycle-use Otto (cycle) engine that relates to one embodiment of the invention.Among the figure, the shell of this internal-combustion engine is made of left crankcase 1, right crankcase 2, left crankcase lid 3, right crankcase cover 4, cylinder block 5, cylinder head 6, cylinder head cover 7.Bent axle 8 is made up of left and right sides two-part and is fused by crankpin 9.Bent axle 8 can supported by rolling bearing 10,11 respectively in left crankcase 1 and right crankcase 2 rotationally.Piston 13 is connected with crankpin 9 by connecting rod 12.This piston 13 moves back and forth along the cylinder axis direction in cylinder block 5.Formation firing chamber 14 below cylinder head 6.Install on cylinder head 6 and do not make illustrated spark plug, it is most advanced and sophisticated facing to above-mentioned firing chamber 14.The camshaft 16 of valve actuating gear can be supported in the cylinder head 6 rotationally.
Left side at the internal-combustion engine of assembling as described above is provided with cam chain chamber 17, and its space, left part from camshaft 16 connects the inside up to left crankcase 1.Setting-in driving sprocket wheel 18 on the left side of bent axle 8, the fixing driven sprocket 19 in the left part of camshaft 16, cam chain 20 hangs on these two sprocket wheels.Like this, to the rotating drive power of camshaft 16 transmission bent axles 8, just can be at the suction and discharge valve of scheduled time driving device in cylinder head 6.In addition, 35 alternators, 36 that are arranged on a square end portion of bent axle 8 are provided in a side of the starting clutch, the 37th of the other end of bent axle 8, the switch clutch of speed changer, the 38th, transmission gear group, the 39th, water pump.
Fig. 2 is the figure of longitudinal plane of the cam chain chamber 17 of the above-mentioned internal-combustion engine of perforation seen from vehicle-mounted state left side.Bent axle 8 and driving sprocket wheel 18 rotate to the direction of the arrow A of figure; The driven sprocket 19 and the camshaft 16 that drive by cam chain 20 rotate to the direction of arrow B.
Along the cam chain 20 by driving sprocket wheel 18 drawing sides fixed resinous chain guide apparatus 21 is set, it guides this cam chain 20, and is fixed on the fixing part on every side of cam chain chamber 17.The section of the cam chain slip side of chain guide apparatus 21 becomes the groove shape that equates with the width of cam chain 20 substantially, and cam chain 20 slides at this bottom land.
Along the cam chain 20 of releasing side by driving sprocket wheel 18 cam chain tension means 22 is set, it is made of stretcher 23 and rotary type chain guide apparatus 24; This chain guide apparatus 24 is made of arm 25 and chute 26.Chain guide apparatus 24 is that the center can be supported rotationally with the support part of its underpart.Connect cylinder block 5 stretcher 23 is set, its tip is to the cam chain chamber 17 inner outstanding chain guide apparatus 24 that can rotate of pushing, and the chain guide apparatus 24 that is pressed is pushed cam chain 20 and prevented that cam chain 20 is lax.
The chain guide apparatus 24 of cam chain tension means 22 is made of arm 25 and chute 26, and the whippy steel series metal of arm 25 usefulness is made, and chute 26 usefulness vulcanites are based resin molded and be installed in the chain slip side of arm 25.The cam chain slide part brake forming of chute 26 is the curved shape of cam chain, and the section of its cam chain slip side becomes the groove that equates with the width of cam chain substantially, and cam chain 20 slides at this bottom land.
Fig. 3～Fig. 5 is the base end part figure as center of rotation of the chain guide apparatus 24 that device 23 pushing of being tensioned.Fig. 3 is that figure, Fig. 3 (a) of the base end part 25a of arm 25 is side view, Fig. 3 (b) expression B-B section; The base end part 25a of arm 25 is the end bent formation annulus with metal.Fig. 4 is the figure of the base end part 26a of chute 26, (a) is side view, (b) expression B-B section; The base end part 26a of chute 26 forms aperture portion in the end.Fig. 5 is the profile of the base end part 24a of the chain guide apparatus 24 that constitutes of arm 25 and chute 26, is formed centrally pivot reach through hole 27 in base end part.
Fig. 6 prevents the come off figure of plate 30 of cam chain, and Fig. 6 (a) is a planimetric map, and Fig. 6 (b) is the B-B sectional drawing of Fig. 6 (a), and Fig. 6 (c) is the C-C sectional drawing of Fig. 6 (a).As shown in Figure 2, this prevents that the cam chain plate 30 that comes off is installed on the left crankcase 1 by two bolts 31,32, round the peripheral part of driving sprocket wheel 18.Prevent that the cam chain plate 30 that comes off from being the parts of sheet metal processing,, on flat main part 30a, screw 30b, 30c are set for the above-mentioned bolt 31,32 of break-through.Bending and be the press part 30d that pushes the base end part 24a of chain guide apparatus shown in Figure 5 24 to the outstanding sideling end of foreign side is established pivot reach through hole 30e in the central authorities of this press part 30d.Adjoin mutually with above-mentioned cardinal extremity press part 30d and crooked to the inside curved edges portion is the movement limiting portion 30f that the rolling bearing 10 of bent axle is supported in restriction, it is the part that the overcoat 10a (Fig. 7) with above-mentioned rolling bearing 10 touches.From the inwardly outstanding part of above-mentioned curved edges portion bending is to prevent the cam chain 30g of portion that comes off, its end with hang over driving sprocket wheel 18 on the part of the periphery of rotating cam chain 20 and the side small gap that is separated by relative, be the part that prevents that chain from coming off.
Fig. 7 is the enlarged view of the periphery of cam chain driving sprocket wheel 18 shown in Figure 2.As described below, prevent the come off installation of plate 30 of cam chain: at first, at pivot reach through hole 27 (Fig. 5) from the chain guide apparatus cardinal extremity 24a of outstanding pivot 28 (Fig. 8) the installation cam chain tension means 22 of left crankcase 1; Install again and prevent the come off pivot reach through hole 30e (Fig. 6 (a)) of end of plate 30 of cam chain.At this moment, will prevent that the come off curved edges portion of plate 30 of cam chain from being on the side of the bent axle rolling bearing movement limiting portion 30f overcoat 10a that abuts against rolling bearing 10.To prevent that the cam chain 30g of portion that comes off from moving near the periphery of cam chain 20 and the position of sidepiece.To prevent that at this state the cam chain plate 30 usefulness bolts 31,32 that come off are fixed on the left crankcase 1.Cardinal extremity press part 30d, the bent axle rolling bearing movement limiting portion 30f of the chain guide apparatus by fixedly making cam chain tension means with bolt 31,32 and prevent that the cam chain 30g of portion that comes off from can bring into play its function respectively.That is, chain guide apparatus 24 can be held rotationally at its base end part, and the overcoat 10a of the rolling bearing 10 of bent axle is pressed and limits mobilely, and cam chain 20 is thrown off to prevent just in case from sprocket wheel by protection and also can not come off.
Fig. 8 is the VIII-VIII sectional drawing of Fig. 7.In the drawings, at the base end part 24a that chain guide apparatus 24 are installed from the outstanding pivot that is provided with 28 of left crankcase 1, prevent to prevent that the come off chain guide apparatus base end part press part 30d of plate 30 of cam chain from throwing off above-mentioned base end part 24a in the side of base end part 24a; Rolling bearing movement limiting portion 30f abuts against the side of the overcoat 10a of rolling bearing 10, and the axial of restriction rolling bearing 10 moved.
In addition, the 40th, actuating motor, the rotation of this actuating motor 40 is delivered to bent axle 8 by gear 41,42.The 43rd, overrunning clutch, by the effect of overrunning clutch 43, can be when the internal-combustion engine entry into service to actuating motor 40 transferring power.
Fig. 9 is the IX-IX sectional drawing of Fig. 7.Prevent cam chain to come off the 30g of portion is oppositely arranged and, prevent that cam chain from coming off near the periphery of the volume extension portion of cam chain 20 and the side of cam chain 20; Prevent that the come off rolling bearing movement limiting portion 30f of plate 30 of cam chain from touching on the overcoat 10a of rolling bearing 10, the axial of restriction rolling bearing 10 moved.
Up to now, the base end part pressing component of the chain guide apparatus of cam chain tension means, the parts that prevent cam chain to come off plate and restriction bent axle rolling bearing move are respectively independent parts, and being integrated to form at this enforcement parts that these are variant prevents the cam chain plate that comes off.That is: will prevent that the come off end of plate of cam chain from prolonging chain guide apparatus base end part press part 30d as cam chain tension means; Utilization prevents that cam chain from coming off the curved edges portion of plate as the movement limiting portion 30f of rolling bearing; Setting from curved edges portion inwardly the protuberance of side as preventing the cam chain 30g of portion that comes off.Like this, can realize three functions, can reduce number of components and assemble man-hour, enhance productivity with parts.
Claims (1)
1. an internal-combustion engine prevents the cam chain dropping structure, in this structure, bent axle rotates by rolling bearing and is supported in the crankcase freely, around the driving sprocket wheel that is inlaid in the valve driving system on this bent axle, be provided with and prevent to hang over the plate that the cam chain on the driving sprocket wheel comes off, it is characterized in that, above-mentioned prevent cam chain come off plate and the base end part of the chain guide apparatus of the cam chain tension means of pushing above-mentioned cam chain the press part and limit above-mentioned rolling bearing and form one along the crankshaft center line moving member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP068294/2003 | 2003-03-13 | ||
| JP2003068294A JP4230255B2 (en) | 2003-03-13 | 2003-03-13 | Internal combustion engine cam chain fall-off prevention structure |
| JP068294/03 | 2003-03-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1530566A true CN1530566A (en) | 2004-09-22 |
| CN1312417C CN1312417C (en) | 2007-04-25 |
Family
ID=33285680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100283007A Expired - Fee Related CN1312417C (en) | 2003-03-13 | 2004-03-09 | IC engine structure for preventing cam chain drop |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4230255B2 (en) |
| CN (1) | CN1312417C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102604A (en) * | 2011-03-10 | 2011-06-22 | 重庆长安汽车股份有限公司 | Engine air cylinder head cover capable of preventing timing chain from skipping |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5074369B2 (en) * | 2008-09-25 | 2012-11-14 | 本田技研工業株式会社 | Cam chain tensioner pivot mounting structure for internal combustion engine |
| JP5554638B2 (en) * | 2010-06-11 | 2014-07-23 | 本田技研工業株式会社 | Internal combustion engine |
| JP6539244B2 (en) | 2016-09-30 | 2019-07-03 | 本田技研工業株式会社 | Internal combustion engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2093798U (en) * | 1991-07-06 | 1992-01-22 | 西安益民三轮车厂 | Chain guard of tricycles |
| JPH10238600A (en) * | 1997-02-28 | 1998-09-08 | Shibaura Eng Works Co Ltd | Transmission |
| CN2328577Y (en) * | 1998-05-18 | 1999-07-14 | 王长利 | Anti-drop chain wheel disc |
| JP4245224B2 (en) * | 1999-04-23 | 2009-03-25 | 本田技研工業株式会社 | Valve drive device |
-
2003
- 2003-03-13 JP JP2003068294A patent/JP4230255B2/en not_active Expired - Fee Related
-
2004
- 2004-03-09 CN CNB2004100283007A patent/CN1312417C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102604A (en) * | 2011-03-10 | 2011-06-22 | 重庆长安汽车股份有限公司 | Engine air cylinder head cover capable of preventing timing chain from skipping |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004278354A (en) | 2004-10-07 |
| CN1312417C (en) | 2007-04-25 |
| JP4230255B2 (en) | 2009-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070425 Termination date: 20130309 |