CN2916142Y - Engine camshaft pressure relief mechanism - Google Patents
Engine camshaft pressure relief mechanism Download PDFInfo
- Publication number
- CN2916142Y CN2916142Y CN 200620110512 CN200620110512U CN2916142Y CN 2916142 Y CN2916142 Y CN 2916142Y CN 200620110512 CN200620110512 CN 200620110512 CN 200620110512 U CN200620110512 U CN 200620110512U CN 2916142 Y CN2916142 Y CN 2916142Y
- Authority
- CN
- China
- Prior art keywords
- centrifugal
- exhaust cam
- rotating shaft
- camshaft
- limiting board
- 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.)
- Expired - Fee Related
Links
- 230000006837 decompression Effects 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000009499 grossing Methods 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Valve Device For Special Equipments (AREA)
Abstract
The utility model discloses a camshaft decompressor mechanism for engine, which is characterized in that; the camshaft is provided with a stop plate opened with a gap; a bulging with its axial through hole matched with a rotating shaft connected to a centrifugal block is positioned between the stop plate and an exhaust cam; one end of the rotating shaft is inserted into an arc groove positioned on a base circle of the exhaust cam, which is provided with a semi-circular section with its plane on the axial lead lower than the base circle circumferential surface of the exhaust cam, while the rotating shaft circumferential surface is higher than that of the exhaust cam base circle; the other end of the rotating shaft is fixed and connected with a fixed point end of the centrifugal block, vertical line of a driving point end of the centrifugal block positioned inside the gap of the stop plate is vertical to the plane of the upper semi-circular section. The utility model, with simple structure, fewer parts and components and convenient installation, is capable of propping up the exhaust valve automatically when the engine extinct to exhaust the compressed air in the firebox and smoothing the engine's start-up next time.
Description
Technical field
The utility model relates to a kind of decompressor of motor, particularly a kind of camshaft decompression mechanism of motor.
Background technique
Motor is when starting, and is more smooth in order to make engine start, generally adopts the device that cylinder pressure when reducing engine start is set on motor, to guarantee the smooth startup of motor.The device of cylinder pressure when being used to reduce engine start at present mainly is to adopt the reduction valve that is communicated with the firing chamber is set on cylinder head, regulates the gas compression pressure of controlling in the cylinder by opening reduction valve, reduces air pressure, makes and starts function to start smoothly.But need be when engine ignition the starts other individual operation of this reduction valve is opened, and causes with ignition trigger asynchronously easily, influences the smooth startup of motor, and then influences the working life of starting electrical machinery.
Summary of the invention
The purpose of this utility model provides a kind of camshaft decompression mechanism of motor, and it can back down exhaust valve automatically when engine misses, release the pressurized gas in the firing chamber, and motor startup next time is carried out smoothly.
The purpose of this utility model is achieved in that and comprises and being provided with into, the camshaft of exhaust cam and centrifugal, camshaft is provided with a notched limiting board, shaft part between this limiting board and the exhaust cam is provided with a projection that axial hole is arranged, this protruding through hole and the rotating shaft Spielpassung that is connected centrifugal, the Cheng Jiyuan that closely stops that one end of this rotating shaft is inserted in exhaust cam goes up in the arc groove that is provided with, shaft part in the insertion arc groove is provided with semicircle and cuts off, the plane that is positioned at shaft axis that semicircle cuts off is lower than the basic circle circumferential surface of exhaust cam, the shaft circumference face is higher than the basic circle circumferential surface of exhaust cam, the other end of rotating shaft is circumferentially fixedlyed connected with centrifugal fixed point end, the plane that is positioned at shaft axis that the vertical line of centrifugal moving some end cuts off perpendicular to the axle upper semi-circle, centrifugal breach that is arranged in limiting board.
Owing to adopted such scheme, camshaft to be provided with a notched limiting board, centrifugal breach that is arranged in limiting board makes the breach angle both sides restriction of centrifugal block of limited plate when static or centrifugal motion.Shaft part between limiting board and the exhaust cam is provided with a projection that axial hole is arranged, and this protruding through hole and the rotating shaft Spielpassung that is connected centrifugal can be done centrifugal motion for centrifugal when making the camshaft rotation.An end that connects centrifugal rotating shaft is inserted in closely stopping in the arc groove on the Cheng Jiyuan of exhaust cam, the plane that is positioned at shaft axis that the rotating shaft upper semi-circle cuts off is lower than the basic circle circumferential surface of exhaust cam, and the circumferential surface of rotating shaft is higher than the circumferential surface that exhaust cam closely stops Cheng Jiyuan; The other end of rotating shaft is circumferentially fixedlyed connected with centrifugal fixed point end, the plane that is positioned at shaft axis that the vertical line of centrifugal moving some end cuts off perpendicular to the axle upper semi-circle, and the counterweight centre-of gravity shift of moving some end is at the opposite direction of centrifugal motion.When engine misses, centrifugal because of counterweight centre-of gravity shift, freely drop to the ground and on the horizontal edge of the breach angle of limiting board, be state of rest, the rotating shaft semicircle that closely stops in the last arc groove of Cheng Jiyuan that is inserted in exhaust cam cuts off with circumference jack-up exhaust valve rocker arm, exhaust valve can not cut out fully, air pressure in the cylinder is reduced, and the startup of motor can be carried out smoothly; When behind the engine start centrifugal when being the centrifugal motion state, the semicircle of rotating shaft cuts off with the plane that is positioned at shaft axis facing to exhaust valve rocker arm, and exhaust valve rocker arm contacts with exhaust cam, and exhaust cam promotion exhaust valve normally opens, cuts out, the motor proper functioning.
Because the startup of motor can be carried out smoothly, the load of starting electrical machinery is reduced, prolong the starting electrical machinery life-span.
The utility model is simple in structure, and component are few, and is easy for installation.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Structural representation when Fig. 1 remains static for the utility model;
Fig. 2 is that the A-A of Fig. 1 is to view;
Structural representation when Fig. 3 is in apocarpy for the utility model;
Fig. 4 is that the B-B of Fig. 3 is to view.
Embodiment
Referring to Fig. 1, Fig. 2, this camshaft decompression mechanism comprises the camshaft 7 that is provided with the inlet and outlet cam and centrifugal 1, and camshaft is provided with a notched limiting board 3, and limiting board 3 is formed in one with camshaft.The breach angle of described limiting stopper 3 is 90 degree, one side angle is horizontal edge.Consider the counterweight problem of limiting board 3 with camshaft 7 rotations, the breach on the limiting board 3 is taked to be symmetrical arranged, and also can realize spacing to centrifugal if only be provided with one.Shaft part between described limiting board 3 and the exhaust cam 4 is provided with a projection 6 that axial hole is arranged, the through hole of this projection 6 and rotating shaft 2 Spielpassung that are connected centrifugal 1.The Cheng Jiyuan that closely stops that one end of described rotating shaft 2 is inserted in exhaust cam 4 goes up in the arc groove that is provided with, shaft part in the insertion arc groove of rotating shaft 2 is provided with semicircle and cuts off, the plane that is positioned at shaft axis that semicircle cuts off is lower than the basic circle circumferential surface of exhaust cam 4, and rotating shaft 2 circumferential surfacies are higher than the basic circle circumferential surface of exhaust cam 4; The other end of rotating shaft 2 is circumferentially fixedlyed connected with centrifugal 1 fixed point end employing pin, perhaps adopts key or spline to connect and also can reach effect same.Be arranged in the breach on 6 sides of the projection on camshaft of limiting board 3 for centrifugal 1.The plane that is positioned at shaft axis that the vertical line of centrifugal moving some end cuts off perpendicular to rotating shaft 2 upper semi-circles, the counterweight of centrifugal 1 moving some end is greater than the fixed point end, the centre-of gravity shift of counterweight is at the opposite direction of centrifugal motion, making centrifugal 1 can be when doing centrifugal motion, rely on the center of gravity of skew freely to fall down, be limited in the horizontal edge of limiting board 3 breach, driving rotating shaft 2 thus turns to the circumferential surface that semicircle with rotating shaft cuts off portion and withstands exhaust valve rocker arm 5, exhaust valve can not cut out fully, leave certain interval and be used for discharging the firing chamber pressurized gas, reduce compression gas-pressure in the cylinder, engine start can be carried out smoothly, the load of starting electrical machinery is reduced, prolong the starting electrical machinery life-span.
Referring to Fig. 3, Fig. 4, behind the engine start, produce centrifugal motion simultaneously with camshaft 7 rotation for centrifugal 1, its moving some end moves to centrifugal direction, leave the horizontal edge of the breach angle of limiting stopper 3, and be limited in the vertical side of breach angle, rotating shaft 2 forwards under centrifugal drive by the axle upper semi-circle and cuts off the plane that is positioned at shaft axis of portion facing to exhaust valve rocker arm 5, because the plane that is positioned at shaft axis that semicircle cuts off is lower than the basic circle circumferential surface of exhaust cam 4, can not contact with exhaust valve rocker arm 5, cause exhaust valve rocker arm 5 to contact, be deflated cam and promote to move up and down, finish unlatching with the side face of exhaust cam 4, close the work of exhaust valve.
Behind the engine misses, centrifugal 1 centrifugal motion stops, the horizontal edge of the centrifugal 1 spacing breach angle at limiting stopper 3 that freely falls down again, and rotating shaft 2 jack-up exhaust valve rocker arms 5 are opened exhaust valve to leave certain interval, for ato unit is once more prepared.
Claims (3)
1. the camshaft decompression mechanism of a motor, comprise and being provided with into, the camshaft of exhaust cam and centrifugal, it is characterized in that: camshaft is provided with a notched limiting board, shaft part between this limiting board and the exhaust cam is provided with a projection that axial hole is arranged, this protruding through hole and the rotating shaft Spielpassung that is connected centrifugal, the Cheng Jiyuan that closely stops that one end of this rotating shaft is inserted in exhaust cam goes up in the arc groove that is provided with, shaft part in the insertion arc groove is provided with semicircle and cuts off, the plane that is positioned at shaft axis that semicircle cuts off is lower than the basic circle circumferential surface of exhaust cam, the shaft circumference face is higher than the basic circle circumferential surface of exhaust cam, the other end of rotating shaft is circumferentially fixedlyed connected with centrifugal fixed point end, the plane that is positioned at shaft axis that the vertical line of centrifugal moving some end cuts off perpendicular to the axle upper semi-circle, centrifugal breach that is arranged in limiting board.
2. the camshaft decompression mechanism of motor according to claim 1 is characterized in that: the breach angle of described notched limiting board is 90 degree, one side angle is horizontal edge.
3. the camshaft decompression mechanism of motor according to claim 1, it is characterized in that: the counterweight centre-of gravity shift of described centrifugal moving some end is at the opposite direction of centrifugal motion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620110512 CN2916142Y (en) | 2006-04-30 | 2006-04-30 | Engine camshaft pressure relief mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620110512 CN2916142Y (en) | 2006-04-30 | 2006-04-30 | Engine camshaft pressure relief mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2916142Y true CN2916142Y (en) | 2007-06-27 |
Family
ID=38187051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620110512 Expired - Fee Related CN2916142Y (en) | 2006-04-30 | 2006-04-30 | Engine camshaft pressure relief mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2916142Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080583A (en) * | 2010-12-27 | 2011-06-01 | 洛阳北方企业集团有限公司 | Engine exhaust device |
-
2006
- 2006-04-30 CN CN 200620110512 patent/CN2916142Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080583A (en) * | 2010-12-27 | 2011-06-01 | 洛阳北方企业集团有限公司 | Engine exhaust device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20070627 Termination date: 20100430 |