CN201110202Y - Automatic decompression cam for minitype single cylinder air-cooled diesel engine - Google Patents
Automatic decompression cam for minitype single cylinder air-cooled diesel engine Download PDFInfo
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- CN201110202Y CN201110202Y CNU2007201885737U CN200720188573U CN201110202Y CN 201110202 Y CN201110202 Y CN 201110202Y CN U2007201885737 U CNU2007201885737 U CN U2007201885737U CN 200720188573 U CN200720188573 U CN 200720188573U CN 201110202 Y CN201110202 Y CN 201110202Y
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- flies
- cam
- decompression
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Abstract
The utility model discloses an automatic relief cam which is used in a small-sized single cylinder air-cooled diesel engine, a starting pressure reducing shaft is arranged on one side of an air exhaust cam, a chamfered edge semicircle part of the starting pressure reducing shaft is higher than a generating circle of the air exhaust cam before starting, an air exhaust valve is opened, and the chamfered edge semicircle part of the starting pressure reducing shaft is lower than the generating circle of the air exhaust cam after starting. An anti-reverse flyweight is arranged on one side of an air inlet cam, when in natural rotation, the anti-reverse flyweight is lower than the generating circle of the air inlet cam, when in reverse rotation, the anti-reverse flyweight is higher than the generating circle of the air inlet cam, and an air inlet valve is opened. The cam of the utility model has the function of automatic decompression when in starting and simultaneously has the anti-reverse function, the problem that two hands must be highly coordinated when in manual decompression is avoided, the external structure is simplified and compact, the operation is simplified, and the requirement for the operation stuff is lowered.
Description
Technical field
The utility model relates to a kind of small-sized single cylinder air-cooled diesel engine cam, and this cam has the mechanism of decompressor, thereby is beneficial to hand pull starting-up in startup automatic decompression of moment.
Background technique
The small-sized single cylinder air-cooled diesel engine is generally hand pull starting-up, by pulling boot disk is rotated and acceleration, and bent axle reaches diesel engine compression ignite rotating speed with boot disk rotation synchronously and starts.To start moment and pull easily in order to make, need open exhaust valve and necessarily reduce pressure.Existing small-sized single cylinder air-cooled diesel engine is provided with external decompressor, and this decompressor is a decompression handle, and decompression handle is installed on the cylinder head cover, and the one end is fixed with a decompression shaft, and decompression shaft places in the cylinder head cover and is positioned at the exhaust valve rocker arm top.During startup, a hand pull starting-up handle, the another hand is pressed decompression handle simultaneously, and decompression shaft is to the lower compression exhaust valve rocker arm, and exhaust valve is opened thus, thus the cylinder internal air pressure reduces to make hand pull starting-up to become light.Existing external decompression handle has following deficiency: two hands all will move when 1, starting, and task is separately arranged, very inconvenience; 2, hand pull starting-up and decompression operation need cooperatively interact, reduced pressure before, all be unfavorable for smooth startup operator's dexterity being had requirement later.Simultaneously, prior art is in start-up course, and may there be the risk of counter-rotating in bent axle, operator can be drawn forward, may not bring injury if do not note.
The model utility content
At the prior art above shortcomings, the purpose of this utility model provides the automatic relief cam of a kind of small-sized single cylinder air-cooled diesel engine.
The purpose of this utility model is achieved in that the automatic relief cam of a kind of small-sized single cylinder air-cooled diesel engine, comprise camshaft, on camshaft, be provided with driving gear, intake cam and exhaust cam, it is characterized in that: be provided with the startup decompression shaft in exhaust cam one side, start decompression shaft and have chamfered edge pin semi-circular structure, before the startup, the chamfered edge semi-circular portions that starts decompression shaft is higher than the exhaust cam basic circle and tappet is up pushed up exhaust valve is opened; After the startup, the chamfered edge semi-circular portions of startup decompression shaft turns an angle under action of centrifugal force and is lower than the exhaust cam basic circle, and diesel engine begins proper functioning.
Further, described driving gear deviates from exhaust cam and simultaneously is provided with and starts decompression and fly piece, and the chamfered edge semi-circular portions that starts decompression shaft is passed from driving gear and is positioned at exhaust cam one side, and the other end is started the decompression shift fork that decompression flies the piece front end and stirs rotatable.
Described startup decompression flies piece and flies piece I and start decompression to fly piece II and form by starting decompression, the startup decompression located therein of decompression shift fork flies the piece front end, two start decompression flies piece and is installed on the driving gear by rivet and can rotates around rivet, two startup decompressions fly each comfortable rivet both sides formation of piece and fly the block length section and fly short section of piece, two start the short section of piece that flies that flies piece that reduces pressure meshes in the gear mode, and the block length section that flies that two startup decompressions fly piece connects by spring.
Further, described intake cam one side is provided with the anti-reverse piece that flies, and the anti-reverse piece that flies has cam structure, and when just changeing, the anti-reverse piece that flies is lower than the intake cam basic circle; During counter-rotating, the anti-reverse piece that flies is higher than the intake cam basic circle and tappet is up pushed up intake valve is opened.
Described camshaft circumference is provided with groove, and pin passes the piece from anti-reverse flying, and groove two walls are inserted at the pin two ends, flies to be provided with on the piece anti-reverse torsion spring and centrifugal reinforced block anti-reverse, and centrifugal reinforced block and the anti-reverse piece that flies are one-body molded.
The utility model has additional and starts decompression and the anti-reverse piece that flies, under action of centrifugal force, be in different working staties respectively, can guarantee normally carrying out of work, exhaust valve can be opened decompression so that startup is carried out smoothly again automatically in the shift fork position that starting reduces pressure flies piece when starting, and the anti-reverse piece that flies can be opened intake valve again when counter-rotating, thereby prevents the appearance of reversal phenomenon.
Compared to existing technology, the utlity model has following beneficial effect:
Can reduce pressure automatically during 1, owing to startup, two hands must hight coordinate when avoiding manually reducing pressure.
2, the mechanism of decompressor is arranged on the camshaft of engine interior, thereby external structure is simplified and compactness;
3, owing to do not relate to artificial decompression operation, there is not the matching problem of hand pull starting-up and decompression operation naturally, simplified operation, reduced requirement operator.
The utility model is simple in structure, is skillfully constructed, and is practical, has a good application prospect.
Description of drawings
Fig. 1-the utility model starts the pre-structure schematic representation;
The B of Fig. 2-Fig. 1 is to structural representation;
The A of Fig. 3-Fig. 1 is to structural representation;
Fig. 4-the utility model starts the back structural representation;
The B of Fig. 5-Fig. 4 is to structural representation;
The A of Fig. 6-Fig. 4 is to structural representation.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Referring to Fig. 1, from the figure as can be seen, the automatic relief cam of small-sized single cylinder air-cooled diesel engine of the present utility model, comprise camshaft 1, on camshaft 1, be provided with driving gear 2, intake cam 3 and exhaust cam 4, be provided with startup decompression shaft 5 in exhaust cam 4 one sides, start decompression shaft 5 and have chamfered edge pin semi-circular structure.Before the startup, the chamfered edge semi-circular portions that starts decompression shaft 5 is higher than exhaust cam basic circle 4 up push up tappet 6 and push rod 12 exhaust valve is opened, thereby the air pressure reduction is beneficial to startup; After the startup, the chamfered edge semi-circular portions of startup decompression shaft 5 turns an angle under action of centrifugal force and is lower than exhaust cam basic circle 4, and diesel engine begins proper functioning.
Simultaneously as can be seen in conjunction with Fig. 1 and Fig. 2, deviate from exhaust cam 4 one sides at driving gear 2 and be provided with circular pit 13, be provided with in the pit 13 and start decompression and fly piece, described startup decompression flies piece and flies piece I 8 (its front end is provided with the decompression shift fork) and start to reduce pressure to fly piece II 9 and form by starting decompression.Two start decompression flies piece and is installed on the driving gear 2 by rivet 10 and can rotates around rivet 10, two startup decompressions fly each comfortable rivet 10 both sides formation of piece and fly the block length section and fly short section of piece, two start the piece weak point section that flies that flies piece that reduces pressure meshes in the gear mode, and two startup decompressions fly the block length section that flies of piece and pass through the connection of spring 11 elasticity.Start a end that decompression shaft 5 has the chamfered edge semi-circular portions and from the through hole 7 of driving gear, pass and be positioned at exhaust cam 4 one sides, the other end with start the decompression shift fork that flies piece I 8 front ends that reduces pressure and contact.As can be seen, decompression shaft 5 is started the decompression shift fork that decompression flies piece I 8 front ends and is stirred from the figure.Before startup, owing to connect the pulling function of spring 11, start decompression and fly piece I 8 owing to there is not action of centrifugal force, start decompression shaft 5 and be in original state, its chamfered edge semi-circular portions is higher than exhaust cam basic circle 4 up pushes up tappet 6, sees Fig. 1, Fig. 2.After the startup, under action of centrifugal force, the decompression shift fork that starting reduces pressure flies piece I 8 front ends is stirred startup decompression shaft 5 and is clockwise rotated, see Fig. 4 Fig. 5, the result who rotates is exactly that the chamfered edge semi-circular portions that starts decompression shaft 5 is lower than exhaust cam basic circle 4, tappet 6 directly contacts with exhaust cam 4, and diesel engine is in proper functioning.
Start effect that decompression flies piece II 9 and be to cooperate and start decompression and fly piece I 8 and make whole rotation keep balance, both connect by spring 11 and gear engagement can the while entad, the while is centrifugal.As can be seen from Figure 2, the startup decompression flies to be fixed with on the piece II 9 the startup decompression that keeps balance and flies piece III14.
Further, described intake cam 3 one sides are provided with the anti-reverse piece 15 that flies, and see Fig. 1 and Fig. 3, and the anti-reverse piece 15 that flies has cam structure, and when just changeing, the anti-reverse piece 15 that flies is lower than intake cam basic circle 3; During counter-rotating, the anti-reverse piece 15 that flies is higher than intake cam basic circle 3 and tappet is up pushed up intake valve is opened.Described camshaft 1 circumference is provided with groove 16, pin 17 passes the piece 15 from anti-reverse flying, 16 liang of walls of groove are inserted at pin 17 two ends, fly to be provided with on the piece 15 anti-reverse torsion spring 18 and centrifugal reinforced block 19 anti-reverse, and centrifugal reinforced block 19 and the anti-reverse piece 15 that flies are one-body molded.
Working principle of the present utility model:
One, the principle that reduces pressure automatically: before the startup, owing to there is not centrifugal force, start decompression fly piece under the effect of spring in the raw, as Fig. 1 and Fig. 2, at this moment, the chamfered edge semi-circular portions that starts decompression shaft 5 is higher than the exhaust cam basic circle and replaces exhaust cam upwards to promote tappet, the push rod of exhaust valve successively, see Fig. 1, make valve rocker one end lifting, the valve rocker the other end presses down opens exhaust valve, the cylinder internal air pressure is reduced, thereby makes things convenient for hand pull starting-up;
In a single day motor starts up, under action of centrifugal force, the decompression shift fork that starting reduces pressure flies piece I 8 front ends overcomes the active force of spring, stir the startup decompression shaft and clockwise rotate several angle, see Fig. 2, the chamfered edge semi-circular portions that starts decompression shaft is lower than the exhaust cam basic circle, sees Fig. 4, at this moment, tappet is directly got back to normal working by cam action.
Two, anti-reverse principle: owing to be provided with the anti-reverse piece that flies in intake cam one side, under the action of centrifugal force of proper functioning, the anti-reverse piece that flies is lower than the intake cam basic circle, tappet directly by cam action to guarantee the motor proper functioning, see Fig. 4 and Fig. 6.When counter-rotating occurring, under reverse action of centrifugal force, the anti-reverse piece that flies is higher than the intake cam basic circle and directly will pushes up on the air inlet tappet, and the effect by push rod and rocking arm is opened intake valve, thereby Fig. 1 and Fig. 3 are seen in the appearance of reversal phenomenon when preventing to start.
No matter starting decompression shaft is semi-circular structure or other structures, its purpose is exactly to make it have different lifts on shaft axis when rotating, its essence is the cam principle, therefore, in the utility model, starting decompression shaft is chamfered edge semi-circular structure formula cams in exhaust cam one side, and the anti-reverse cams that flies piece also can be replaced by the chamfered edge semi-circular structure.
Claims (5)
1, the automatic relief cam of a kind of small-sized single cylinder air-cooled diesel engine, comprise camshaft (1), on camshaft (1), be provided with driving gear (2), intake cam (3) and exhaust cam (4), it is characterized in that: be provided with startup decompression shaft (5) in exhaust cam (4) one sides, start decompression shaft (5) and have chamfered edge pin semi-circular structure, before the startup, the chamfered edge semi-circular portions that starts decompression shaft (5) is higher than exhaust cam (4) basic circle and tappet (6) is up pushed up exhaust valve is opened; After the startup, the chamfered edge semi-circular portions that starts decompression shaft (5) is lower than exhaust cam (4) basic circle under action of centrifugal force.
2, the automatic relief cam of small-sized single cylinder air-cooled diesel engine according to claim 1, it is characterized in that: described intake cam (3) one sides are provided with the anti-reverse piece (15) that flies, the anti-reverse piece (15) that flies has cam structure, and when just changeing, the anti-reverse piece (15) that flies is lower than intake cam (3) basic circle; During counter-rotating, the anti-reverse piece (15) that flies is higher than intake cam (3) basic circle and tappet (6) is up pushed up intake valve is opened.
3, the automatic relief cam of small-sized single cylinder air-cooled diesel engine according to claim 1 and 2, it is characterized in that: described driving gear (2) deviates from exhaust cam (4) one side and is provided with and starts decompression and fly piece, the chamfered edge semi-circular portions of startup decompression shaft (5) is passed from driving gear (2) and is positioned at exhaust cam (4) one sides, and the other end is started the decompression shift fork that flies the piece front end that reduces pressure and stirs rotatable.
4, the automatic relief cam of small-sized single cylinder air-cooled diesel engine according to claim 3, it is characterized in that: described startup decompression flies piece and flies piece I (8) and start to reduce pressure to fly piece II (9) and form by starting decompression, the startup decompression located therein of decompression shift fork flies the piece front end, two start decompression flies piece (8,9) being installed in driving gear (2) by rivet (10) goes up and can rotate around rivet (10), two start decompression flies piece (8,9) each comfortable rivet (10) both sides forms and flies the block length section and fly the short section of piece, two start the piece weak point section that flies that flies piece that reduces pressure meshes in the gear mode, and two startup decompressions fly the block length section that flies of piece and pass through the connection of spring (11) elasticity.
5, the automatic relief cam of small-sized single cylinder air-cooled diesel engine according to claim 2, it is characterized in that: described camshaft (1) circumference is provided with groove (16), pin (17) passes the piece (15) from anti-reverse flying, groove (16) two walls are inserted at pin (17) two ends, fly to be provided with on the piece (15) anti-reverse torsion spring (18) and centrifugal reinforced block (19) anti-reverse, centrifugal reinforced block (19) and the anti-reverse piece (15) that flies are one-body molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201885737U CN201110202Y (en) | 2007-12-19 | 2007-12-19 | Automatic decompression cam for minitype single cylinder air-cooled diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201885737U CN201110202Y (en) | 2007-12-19 | 2007-12-19 | Automatic decompression cam for minitype single cylinder air-cooled diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201110202Y true CN201110202Y (en) | 2008-09-03 |
Family
ID=39894732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201885737U Expired - Lifetime CN201110202Y (en) | 2007-12-19 | 2007-12-19 | Automatic decompression cam for minitype single cylinder air-cooled diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201110202Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588032A (en) * | 2012-02-17 | 2012-07-18 | 隆鑫通用动力股份有限公司 | Pressure reduction mechanism for air distribution cam shaft of diesel engine |
-
2007
- 2007-12-19 CN CNU2007201885737U patent/CN201110202Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588032A (en) * | 2012-02-17 | 2012-07-18 | 隆鑫通用动力股份有限公司 | Pressure reduction mechanism for air distribution cam shaft of diesel engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: CHONGQING HESHENG INDUSTRY CO., LTD. Assignor: Chen Ken Contract record no.: 2010500000059 Denomination of utility model: Automatic decompression cam for minitype single cylinder air-cooled diesel engine Granted publication date: 20080903 License type: Exclusive License Record date: 20100916 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20080903 |
|
| CX01 | Expiry of patent term |