CN101498231A - Pressure reducing apparatus of engine - Google Patents
Pressure reducing apparatus of engine Download PDFInfo
- Publication number
- CN101498231A CN101498231A CNA2009100097167A CN200910009716A CN101498231A CN 101498231 A CN101498231 A CN 101498231A CN A2009100097167 A CNA2009100097167 A CN A2009100097167A CN 200910009716 A CN200910009716 A CN 200910009716A CN 101498231 A CN101498231 A CN 101498231A
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- mentioned
- camshaft
- decompression
- cam
- exhaust cam
- Prior art date
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Classifications
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- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
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- 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
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- 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
- F01L2001/0535—Single overhead camshafts [SOHC]
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- 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
- F01L2305/00—Valve arrangements comprising rollers
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention relates to a decompression device for an engine. An exhaust cam is arranged on a camshaft supported by a cylinder head rotated freely. A decompression cam capable of protruding from a base circle portion of the exhaust cam is connected on a decompression weight rotatably supported on the camshaft through a decompression pin having an axle parallel to the camshaft so as to compact the decompression device in a manner of minimizing the cylinder head. The decompression pin (55) is configured inside compared to the outer periphery of a high-position part (40b) of the exhaust cam (40) from the axle direction of the camshaft (30).
Description
Technical field
[0001] the present invention relates to a kind of decompressor of motor, the decompressor of this motor, on the camshaft that rotation is freely supported by cylinder head, drive in order to drive valve to outlet valve by above-mentioned high-order portion, be provided with that to have with the axis of this camshaft be the circular-arc basic circle portion at center, with the exhaust cam of comparing the high-order portion that outside side links to each other with the Zhou Fangxiang two ends of above-mentioned basic circle portion highlightedly with above-mentioned basic circle portion, on the decompression counterweight on the above-mentioned camshaft, linking can be from the outstanding relief cam of above-mentioned basic circle portion at the decompression pin rotatably support through having the axis parallel with above-mentioned camshaft.
Background technique
[0002] such decompressor for example passes through patent documentation 1 by known.
Patent documentation 1: No. 3435951 communique of Japan's special permission
[0003] still, in by above-mentioned patent documentation 1 disclosed decompressor, though with the decompression retainer of the fastening binding of camshaft on the decompression counterweight through decompression pin rotatably support, but from the axial direction of camshaft, the part of above-mentioned decompression pin is compared with the high-order portion of exhaust cam and is configured in foreign side, radial direction at camshaft, decompressor maximizes, and therefore, causes the maximization of cylinder head.
[0004] the present invention uses for reference above-mentioned situation and invents out, with provide a kind of in order to make the cylinder head miniaturization compactness the decompressor of motor be purpose.
Summary of the invention
[0005] to achieve these goals, technological scheme 1 described invention is a kind of decompressor of motor, the decompressor of described motor is on the camshaft that rotation is freely supported by cylinder head, drive in order to drive valve to outlet valve by high-order portion, be provided with that to have with the axis of this camshaft be the circular-arc basic circle portion at center, with the exhaust cam of comparing the above-mentioned high-order portion that outside side links to each other with the Zhou Fangxiang two ends of above-mentioned basic circle portion highlightedly with above-mentioned basic circle portion, at decompression pin rotatably support through having the axis parallel with above-mentioned camshaft on the decompression counterweight on the above-mentioned camshaft, linking can be from the outstanding relief cam of above-mentioned basic circle portion, it is characterized in that above-mentioned decompression pin is seen to compare with the periphery of above-mentioned high-order portion from the axial direction of above-mentioned camshaft and is configured in interior side.
[0006] in addition, technological scheme 2 described inventions are on the architecture basics of technological scheme 1 described invention, it is characterized in that, one end of above-mentioned camshaft is freely supported by the said cylinder head through the block bearing rotation, the above-mentioned decompression counterweight that folder has been established packing ring between itself and above-mentioned block bearing is configured between above-mentioned block bearing and the above-mentioned exhaust cam, by this exhaust cam cantilever support.
[0007] and then, technological scheme 3 described inventions are on the architecture basics of technological scheme 2 described inventions, it is characterized in that, on the face relative of above-mentioned decompression counterweight with above-mentioned packing ring, the outstanding a plurality of teats that contact with this packing ring that are provided with.
[0008] in addition, embodiment's first ball bearing 37 is corresponding with block bearing of the present invention.
The invention effect
[0009] according to technological scheme 1 described invention, because decompression pin is compared with the periphery of the high-order portion of exhaust cam on the axial direction of camshaft and is configured in interior side, so can make decompressor more near the axis ground of camshaft compactness more, thus, also can make the cylinder head miniaturization.
[0010] in addition, according to technological scheme 2 described inventions, because the decompression counterweight is by the exhaust cam cantilever support, so can make the decompressor compactness in direction along the axis of camshaft, make further miniaturization of cylinder head, simultaneously, make the decompression counterweight be clipped between exhaust cam and the packing ring, can prevent to rock, can make the action of decompressor good by the decompression counterweight of cantilever support.
[0011] and then, according to technological scheme 3 described inventions, since be arranged on a plurality of teats of decompression on the counterweight only with the packing ring butt, the butt area of counterweight and packing ring so can reduce to reduce pressure, reduce the frictional force that between decompression counterweight and packing ring, produces, the action that further improves the decompression counterweight.
Description of drawings
[0036]
Fig. 1 is the main position longitudinal section of motor.
Fig. 2 is the 2-2 line sectional view of Fig. 1.
Fig. 3 is the 3-3 line amplification view of the Fig. 2 under the decompression closed condition.
Fig. 4 is the 4-4 line amplification view of the Fig. 2 under the decompression closed condition.
Fig. 5 is the exploded perspective view of decompressor.
Fig. 6 is the sectional view corresponding with Fig. 4 under the decompression opening state.
Symbol description
[0037]
13: cylinder head
30: camshaft
37: as first ball bearing of block bearing
40: exhaust cam
40a: basic circle portion
40b: high-order portion
54: decompressor
55: the decompression pin
56: the decompression counterweight
57: relief cam
73: packing ring
74,75: teat
Embodiment
[0012] below,, embodiments of the present invention is described based on one embodiment of the present of invention shown in the drawings.
[0013] Fig. 1～Fig. 6 is the figure of expression one embodiment of the present of invention, Fig. 1 is the main position longitudinal section of motor, Fig. 2 is the 2-2 line sectional view of Fig. 1, Fig. 3 is the 3-3 line amplification view of the Fig. 2 under the decompression closed condition, Fig. 4 is the 4-4 line amplification view of the Fig. 2 under the decompression closed condition, Fig. 5 is the exploded perspective view of decompressor, and Fig. 6 is the sectional view corresponding with Fig. 4 under the decompression opening state.
[0014] at first, in Fig. 1, the engine main body 11 of this motor for example is the engine main body that is equipped on the two-wheeled motor vehicle, and above-mentioned engine main body 11 possesses: have the cylinder block 12 that makes the chimeric cylinder bore 16 in piston 15 free sliding ground; The firing chamber 17 that will face the top of above-mentioned piston 15 be formed on said cylinder body 12 between and the cylinder head 13 that combines with cylinder block 12; From being attached to the cylinder-head cover 14 of this cylinder head 13 with said cylinder body 12 opposite sides; From with the crankcase (not shown) of said cylinder 13 opposite side and 12 combinations of said cylinder body.
[0015] on said cylinder 13, be provided with at the intakeport 18 of one lateral opening with at the relief opening 19 of the another side of cylinder head 13 opening, form with the sucking pipe 21 of the air suction way 20 of above-mentioned intakeport 18 connections and said cylinder 13 and be connected, on this sucking pipe 12, set up Fuelinjection nozzle 22.
[0016] in addition, on said cylinder 13, set Aspirating valves 24 that the connection between above-mentioned intakeport 18 and the above-mentioned firing chamber 17 is switched with can carrying out on-off action, to the outlet valve 25 that the connection between above-mentioned relief opening 19 and the above-mentioned firing chamber 17 is switched, Aspirating valves 24 and outlet valve 25 are loaded to closing the valve direction by valve spring 26,27.
[0017] in the lump with reference to Fig. 2, above-mentioned Aspirating valves 24 and above-mentioned outlet valve 25 are to carry out the parts of driven for opening and closing by being contained in the valve device 29 that is formed on the valve cage 28 between said cylinder 13 and the said cylinder skull 14, and this valve device 29 possesses the camshaft 30 that is configured between above-mentioned Aspirating valves 24 and the outlet valve 25; Correspondingly swing with the rotation of this camshaft 30 and Aspirating valves 24 is carried out the suction side rocking arm 31 of driven for opening and closing; Correspondingly swing with the rotation of above-mentioned camshaft 30 and outlet valve 25 is carried out the exhaust side rocking arm 32 of driven for opening and closing.
[0018] first support 33 with clutch shaft bearing hole 35 and second support 34 with second bearing hole 36 coaxial with clutch shaft bearing hole 35 are set integratedly on said cylinder 13.One end of above-mentioned camshaft 30, and interior week in clutch shaft bearing hole 35 between folder establish first ball bearing 37 as block bearing, rotatably mounted by first support 33, partial rotation near the other end of above-mentioned camshaft 30 freely connects second bearing hole 36, has clamped second ball bearing 38 between interior week of second bearing hole 36 and camshaft 30.And camshaft 30 is pressed on the interior ring of first and second ball bearing 37,38.
[0019] between first and second support 33,34, be provided with air inlet cam 39 integratedly at the position near second support 34 of above-mentioned camshaft 30, be provided with exhaust cam 40 integratedly at the position near first support 33 of above-mentioned camshaft 30.Air inlet cam 39 and exhaust cam 40 are to be the circular-arc 39a of basic circle portion, the 40a at center to have respectively with the axis of camshaft 30, form with the mode of comparing the high-order 39b of portion, 40b that outside side links to each other with the Zhou Fangxiang two ends of the above-mentioned basic circle 39a of portion, 40a highlightedly with the 39a of basic circle portion, 40a.
[0020] suction side rocking arm 31 is by having the axis parallel with above-mentioned camshaft 30 and being supported swingably by the suction side pitman arm shafts 41 of said cylinder 13 supporting, be bearing in roller 43 on the end of this suction side rocking arm 31 by axle and roll with air inlet cam 39 and contact, can regulate screws the tappet screw 45 on the other end of suction side rocking arm 31 and the valve rod end 24a butt of Aspirating valves 24 with advancing and retreat the position.In addition, exhaust side rocking arm 32 is by having the axis parallel with above-mentioned camshaft 30 and above-mentioned suction side pitman arm shaft 41 and being supported swingably by the exhaust side pitman arm shaft 42 of cylinder head 13 supportings, be bearing in roller 44 on the end of this exhaust side rocking arm 32 by axle and roll with above-mentioned exhaust cam 40 and contact, can regulate screws the tappet screw 46 on the other end of exhaust side rocking arm 32 and the valve rod end 25a butt of outlet valve 25 with advancing and retreat the position.
[0021] fixing by movable sprocket 47 in the other end of the above-mentioned camshaft of giving prominence to from second support 34 30.This by movable sprocket 47 be constitute the timing driving mechanism 48 that the rotating power will come from the bent axle (not shown) that is freely being supported by the crankcase rotation transmits to camshaft 30 a part by movable sprocket, the cam chain 49 that transmits the power that comes from bent axle is wrapped in above-mentioned by on the movable sprocket 47.And, on the cylinder block 12 and cylinder head 13 of engine main body 11, form the chain walking path 50 that makes above-mentioned cam chain 49 walkings.
[0022] by the way, the above-mentioned camshaft 30 that first and second ball bearing 37,38 is installed is that the tip side that promptly is provided with a side of exhaust cam 40 from the one end is interted in second bearing hole 36, is assembled into the parts in the cylinder head 13, and second bearing hole 36 of second support 34 is formed diameter than being used to allow that to intert the clutch shaft bearing hole 35 that is set at air inlet cam 39 on the camshaft 30 and exhaust cam 40 big.In addition, cylinder head 13 and cylinder-head cover 14 are to press from both sides the parts of the mode combination of establishing liner 51 each other with the roughly corresponding position of the axis of above-mentioned camshaft 30, on the part relative of the sidewall of cylinder head 13 with above-mentioned second support 34, in order to allow above-mentioned camshaft 30 is interted in second bearing hole 36, be provided with the recess 52 of depression in the mode of leaving from cylinder-head cover 14, the cap 51a and the above-mentioned liner 51 that are used to close this recess 52 are formed one.
[0023] in the lump with reference to Fig. 3～Fig. 5, in above-mentioned valve device 29, exhaust pressure when reducing engine start, make starting easily, having set up in engine speed is the decompressor 54 that under the lower state of the rotating ratio of camshaft 30 outlet valve 25 is opened slightly in the moment of closing originally, this decompressor 54 possesses: when the decompression pin 55 through having the axis parallel with camshaft 30 is rotationally by camshaft 30 supportings, be configured in the decompression counterweight 56 between the exhaust cam 40 and first ball bearing 37; Under the low state of engine speed from the 40a of basic circle portion of exhaust cam 40 outstanding and with exhaust side rocking arm 32 butts, but owing to being accompanied by camshaft 30 to the action of centrifugal force that produces by the direction shown in the arrow 53 of Fig. 3 and Fig. 4 rotation, when decompression counterweight 56 is rotated, the relief cam 57 that can the above-mentioned exhaust side rocking arm of butt 32 ground link with decompression counterweight 56.
[0024] decompression counterweight 56 covers camshaft 30 from the side, be formed circular-arc, on the face of first ball bearing, 37 sides of the high-order 40b of portion in the exhaust cam 40 of above-mentioned camshaft 30, the outstanding integratedly supporting teat 58 that extends along the radial direction of camshaft 30 that is provided with.And, the face of second ball bearing, 38 sides of above-mentioned decompression counterweight 56, except its part, be to be formed flatly along plane with the orthogonal axe of above-mentioned camshaft 30, one distolateral in decompression counterweight 56 promptly along the downstream side of the sense of rotation 53 of camshaft 30, cutting away its exhaust cam 40 rear flank, thinner wall section 56a is set, and decompression counterweight 56 another is distolateral, cutting away its exhaust cam 40 rear flank, be provided with to what exhaust cam 40 sides were opened wide and accommodate recess 59, the face that above-mentioned thinner wall section 56a and above-mentioned exhaust cam that accommodate recess 59 and above-mentioned 40 are relative is to be formed flatly along the same plane with the orthogonal axe of camshaft 30.
[0025] on above-mentioned thinner wall section 56a, be provided with bearing hole 60, simultaneously, with the above-mentioned supporting teat 58 sliding contacts ground of above-mentioned camshaft 30 outstanding integratedly be provided with intert the distolateral outer end that is pressed into above-mentioned supporting teat 58 of another of above-mentioned decompression pin 55 in above-mentioned bearing hole 60 around butt teat 61, one ends of the ring-type of this bearing hole 60 in.Thus, the decompression counterweight 56 that is disposed between first ball bearing 37 and above-mentioned exhaust cam 40 through having the decompression pin 55 of the axis parallel with camshaft 30, is supported on the exhaust cam 40 in the mode of cantilever.And the outer end of above-mentioned supporting teat 58 sees it is the high-order 40b of portion that is positioned at exhaust cam 40 from the axial direction of camshaft 30, and decompression pin 55, from the axial direction of above-mentioned camshaft 30, compares with the periphery of the above-mentioned high-order 40b of portion and to be configured in interior side.
[0026] in addition, be provided with the compression zone 56b of semicircle shape at an end of above-mentioned decompression counterweight 56, with the corresponding position of this compression zone 56b, on the sliding eye that the end is arranged 62 that is arranged on the above-mentioned camshaft 30, the chimeric slidably valve tappet that the round-ended cylinder shape is arranged (lifter) 63 that at one end has with the end wall 63a of above-mentioned compression zone 56b butt is provided with to compression spiral helicine spring 64 between the above-mentioned end wall 63a of the dead end of sliding eye 62 and above-mentioned valve tappet 63.The elastic force of this spring 64 acts on above-mentioned compression zone 56b through above-mentioned valve tappet 63, and decompression counterweight 56 is loaded to the approaching side of the outer circumferential face of intermediate portion that makes this decompression counterweight 56 and camshaft 30 by the elastic force of above-mentioned spring 64.And, on the above-mentioned end wall 63a of valve tappet 63, be provided with the pressurization that is used to avoid being formed on the space between this valve tappet 63 and the camshaft 30 and reduce pressure to guarantee the air hole 65 of action smoothly of valve tappet 63.
[0027] above-mentioned relief cam 57 is to be configured between another distolateral and above-mentioned exhaust cam 40 of above-mentioned decompression counterweight 56 in the position corresponding with the 40a of basic circle portion of exhaust cam 40, simultaneously, its part is housed in the above-mentioned parts of accommodating in the recess 59 of above-mentioned decompression counterweight 56, and the continuous integratedly relief cam axle 66 that is provided with of relief cam 57 is entrenched in the axis hole 67 that is arranged on the above-mentioned exhaust cam 40 rotationally therewith.And relief cam axle 66 and axis hole 67 have the axis with the parallel axes of camshaft 30, relief cam 57 can around with the rotational of the parallel axes of camshaft 30, be supported on the camshaft 30.
[0028] above-mentioned relief cam 57, though be to be formed basically and coaxial columned of above-mentioned relief cam axle 66, but the part of above-mentioned exhaust cam 40 sides of this relief cam 57 is for the planar surface portion 68 that can form with the parallel axes of relief cam 57 is cut off.Promptly, the periphery of exhaust cam 49 sides of relief cam 57 is being the circular arc part 69 at center by the axis with relief cam axle 66, and be attached at that mode that the above-mentioned planar surface portion 68 between the Zhou Fangxiang two ends of this circular arc part 69 constitutes is formed, this relief cam 57, can face the decompression closed condition of foreign side in the above-mentioned planar surface portion 68 of comparing the side of being positioned at the 40a of basic circle portion of above-mentioned exhaust cam 40 that makes as shown in Figures 3 and 4, and a part that makes above-mentioned circular arc part 69 is as shown in Figure 6 compared with the 40a of basic circle portion of above-mentioned exhaust cam 40 between the outstanding decompression opening state of foreign side and is rotated.
[0029] on the other hand, end at exhaust side rocking arm 32, with above-mentioned rollers 44 in abutting connection be provided with can with the abutting part 70 of above-mentioned circular arc part 69 butts of above-mentioned relief cam 57, even under the 40a of the basic circle portion state of contact of roller 44 and exhaust cam 40, the circular arc part 69 of relief cam 57 from the above-mentioned basic circle 40a of portion when foreign side is outstanding, by abutting part 70 contact circular arc part 69, exhaust side rocking arm 32 is also incited somebody to action so that the mode that outlet valve 25 is opened is slightly rotated.
[0030] accommodating in the corresponding part of recess 59 in above-mentioned decompression counterweight 56 with above-mentioned, be pressed into connection pin 72 with axis parallel with camshaft 30, make this pressure pin 72 from the outstanding chimeric guide groove 71 of protuberance of decompression counterweight 56, extend along the radial direction of relief cam 57, be set on the part of decompression counterweight 56 sides of this relief cam 57.And, because the rotating ratio of camshaft 30 is bigger, the centrifugal force that acts on decompression counterweight 56 is big, resist the loading force of above-mentioned spring 64 and make this decompression counterweight 56 in decompression counterweight 56 so that under the decompression closed condition that the mode that the intermediate portion of this decompression counterweight 56 leaves from the periphery of camshaft 30 is rotated, as shown in Figures 3 and 4, with guide groove 71 chimeric connection pin 72 and decompression counterweight 56 rotate, under this state, relief cam 57 be positioned at make its planar surface portion 68 compare with the 40a of basic circle portion of above-mentioned exhaust cam 40 aspect face the pivotal position of foreign side, the abutting part 70 and relief cam 57 butts of exhaust side rocking arm 32, exhaust side rocking arm 32 is being followed the cam profile swing of exhaust cam 40, and outlet valve 25 also carries out on-off action in the moment of the cam profile of following exhaust cam 40.In addition, because the rotating ratio of camshaft 30 is less, so it is little to act on the centrifugal force of decompression counterweight 56, rely under intermediate portion that the loading force of above-mentioned spring 64 makes this decompression counterweight 56 the state in decompression counterweight 56 with the decompression unlatching that is rotated with the approaching mode of the periphery of camshaft 30, as shown in Figure 6, with guide groove 71 chimeric connection pin 72 and relief cam 56 rotate, under this state, relief cam 57 be positioned at the part that makes its circular arc part 69 from the 40a of basic circle portion of above-mentioned exhaust cam 40 to the outstanding pivotal position of foreign side, the abutting part 70 of exhaust side rocking arm 32 and circular arc part 69 butts of relief cam 57, therefore exhaust side rocking arm 32 will slightly be swung by above-mentioned relief cam 57 in roller 44 and the moment that the 40a of basic circle portion of exhaust cam 40 contacts, and outlet valve 25 also will irrespectively slightly be opened closing the valve moment with the cam profile of exhaust cam 40.
[0031] between the interior ring of the above-mentioned decompression counterweight 56 and first ball bearing 37, clamped the packing ring 73 (with reference to Fig. 2) of ring-type, on the face relative with above-mentioned packing ring 73 of decompression counterweight 56, butt a plurality of for example a pair of teat 74,75 with above-mentioned packing ring 73 butts integratedly.First ball bearing, the 37 side opening ends that one side's of two teats 74,75 teat 74 surrounds above-mentioned bearing hole 60 also are formed ring-type, and that the opposing party's teat 75 is formed is discoideus, and outstanding the other end that is arranged on decompression counterweight 56.
[0032] then, the effect of present embodiment is described, because the decompression pin 55 of the decompression counterweight 56 of decompressor 54 through having the axis parallel with camshaft 30 supported by above-mentioned camshaft 30 rotationally, above-mentioned decompression pin 55 is seen to compare with the periphery of the high-order 40b of portion the exhaust cam 40 from the axial direction of above-mentioned camshaft 30 and is configured in interior side, so can make decompressor 54 more near the axis ground of camshaft 30 compactness more, thus, also can make cylinder head 13 miniaturizations.
[0033] in addition, because an end first ball bearing 37 of camshaft 30 is by first support, the 33 rotations supporting freely of cylinder head 13, packing ring 73 is located in and the interior ring of first ball bearing 37 between decompression counterweight 56, be configured between first ball bearing 37 and the exhaust cam 40, by these exhaust cam 40 cantilever support, so can make decompressor 54 compactnesss in direction along the axis of camshaft 30, make further miniaturization of cylinder head 13, simultaneously, make decompression counterweight 56 be clipped between exhaust cam 40 and the packing ring 73, can prevent that the decompression counterweight of by cantilever support 56 from rocking, can make the action of decompressor 54 good.
[0034] and then, because on the face relative of decompression counterweight 56 with above-mentioned packing ring 73, the outstanding a plurality of for example a pair of teat 74,75 that contacts with this packing ring 73 that is provided with, the butt area of counterweight 56 and packing ring 73 so can reduce to reduce pressure, reduce the frictional force of generation between decompression counterweight 56 and packing ring 73, further improve the action of decompression counterweight 56.
[0035] above, embodiments of the invention have been described, but the present invention is not defined to the foregoing description, in the scope of the present invention that does not break away from the record in claims, can carries out various design alterations.
Claims (3)
1. the decompressor of a motor, on the camshaft (30) that rotation is freely supported by cylinder head (13), drive in order to drive valve to outlet valve (25) by high-order portion (40b), be provided with that to have with the axis of this camshaft (30) be the circular-arc basic circle portion (40a) at center, with the exhaust cam (40) of comparing the above-mentioned high-order portion (40b) that outside side links to each other with the Zhou Fangxiang two ends of above-mentioned basic circle portion (40a) highlightedly with above-mentioned basic circle portion (40a), at decompression pin (55) rotatably support through having the axis parallel with above-mentioned camshaft (30) on the decompression counterweight (56) on the above-mentioned camshaft (30), linking can be from the outstanding relief cam (57) of above-mentioned basic circle portion (40a), it is characterized in that above-mentioned decompression pin (55) is seen to compare with the periphery of above-mentioned high-order portion (40b) from the axial direction of above-mentioned camshaft (30) and is configured in interior side.
2. the decompressor of motor as claimed in claim 1, it is characterized in that, one end of above-mentioned camshaft (30) is freely supported by said cylinder head (13) through block bearing (37) rotation, the above-mentioned decompression counterweight (56) that folder has been established packing ring (73) between itself and above-mentioned block bearing (37) is configured between above-mentioned block bearing (37) and the above-mentioned exhaust cam (40), by this exhaust cam (40) cantilever support.
3. the decompressor of motor as claimed in claim 2 is characterized in that, on the face relative of above-mentioned decompression counterweight (56) with above-mentioned packing ring (73), and the outstanding a plurality of teats (74,75) that contact with this packing ring (73) that are provided with.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008018071A JP5014181B2 (en) | 2008-01-29 | 2008-01-29 | Engine decompression device |
| JP2008018071 | 2008-01-29 | ||
| JP2008-018071 | 2008-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101498231A true CN101498231A (en) | 2009-08-05 |
| CN101498231B CN101498231B (en) | 2012-01-11 |
Family
ID=40945482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100097167A Active CN101498231B (en) | 2008-01-29 | 2009-01-23 | Pressure reducing apparatus of engine |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5014181B2 (en) |
| KR (1) | KR101036533B1 (en) |
| CN (1) | CN101498231B (en) |
| BR (1) | BRPI0901740B1 (en) |
| MY (1) | MY149289A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775162A (en) * | 2012-10-18 | 2014-05-07 | 铃木株式会社 | Pressure reducing part of pressure reducing device |
| CN105370338A (en) * | 2014-08-22 | 2016-03-02 | 牛刚学 | Executing mechanism for decompressor of internal combustion engine |
| CN109026258A (en) * | 2018-08-16 | 2018-12-18 | 广州大运机车有限公司 | A kind of decompressor of engine |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5446919B2 (en) * | 2010-01-22 | 2014-03-19 | スズキ株式会社 | 4 cycle engine decompression device |
| JP2011202625A (en) * | 2010-03-26 | 2011-10-13 | Honda Motor Co Ltd | Decompression device arrangement structure for engine |
| CN102877910A (en) * | 2012-10-17 | 2013-01-16 | 四川银钢一通凸轮轴股份有限公司 | Decompression mechanism of engine and engine |
| JP2015224580A (en) | 2014-05-27 | 2015-12-14 | ヤマハ発動機株式会社 | Engine and vehicle |
| CN104696039B (en) * | 2015-03-11 | 2017-08-01 | 重庆交通大学 | Engine decompression starting formula air distributing device |
| JP6673986B2 (en) * | 2018-07-18 | 2020-04-01 | 本田技研工業株式会社 | Internal combustion engine |
| JP7225667B2 (en) * | 2018-10-19 | 2023-02-21 | スズキ株式会社 | Decompression device |
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| JP4208329B2 (en) * | 1999-03-09 | 2009-01-14 | 本田技研工業株式会社 | Decompression device for 4-cycle internal combustion engine |
| JP2002115518A (en) | 2000-10-10 | 2002-04-19 | Suzuki Motor Corp | Decompression structure of engine |
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| JP4180447B2 (en) * | 2003-06-04 | 2008-11-12 | 本田技研工業株式会社 | Decompression device for internal combustion engine |
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- 2008-01-29 JP JP2008018071A patent/JP5014181B2/en active Active
- 2008-11-19 KR KR1020080115142A patent/KR101036533B1/en active IP Right Grant
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2009
- 2009-01-23 MY MYPI20090328A patent/MY149289A/en unknown
- 2009-01-23 CN CN2009100097167A patent/CN101498231B/en active Active
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775162A (en) * | 2012-10-18 | 2014-05-07 | 铃木株式会社 | Pressure reducing part of pressure reducing device |
| CN103775162B (en) * | 2012-10-18 | 2016-05-18 | 铃木株式会社 | The relief portion of decompressor |
| CN105370338A (en) * | 2014-08-22 | 2016-03-02 | 牛刚学 | Executing mechanism for decompressor of internal combustion engine |
| CN105370338B (en) * | 2014-08-22 | 2018-09-25 | 牛刚学 | The executing agency of internal-combustion engine reliever |
| CN109026258A (en) * | 2018-08-16 | 2018-12-18 | 广州大运机车有限公司 | A kind of decompressor of engine |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20090083270A (en) | 2009-08-03 |
| CN101498231B (en) | 2012-01-11 |
| JP2009180104A (en) | 2009-08-13 |
| JP5014181B2 (en) | 2012-08-29 |
| BRPI0901740A2 (en) | 2010-04-13 |
| BRPI0901740B1 (en) | 2021-01-12 |
| MY149289A (en) | 2013-08-15 |
| KR101036533B1 (en) | 2011-05-24 |
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