CN106337702A - Camshaft - Google Patents
Camshaft Download PDFInfo
- Publication number
- CN106337702A CN106337702A CN201510418935.6A CN201510418935A CN106337702A CN 106337702 A CN106337702 A CN 106337702A CN 201510418935 A CN201510418935 A CN 201510418935A CN 106337702 A CN106337702 A CN 106337702A
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- China
- Prior art keywords
- gear
- block
- camshaft
- axis body
- engine
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Abstract
The invention provides a camshaft pressure reduction device, and belongs to the technical field of camshafts. By adoption of the camshaft pressure reduction device, the problems that an existing engine is difficult to start, and a camshaft is heavy are solved. A camshaft comprises a shaft body. An intake cam, an exhaust cam, a gear and the pressure reduction device are arranged on the shaft body. The pressure reduction device comprises a flail block swinging body, a shifting block and a reset mechanism, wherein the flail block swinging body is arranged on the side, facing the exhaust cam, of the gear, and a shifting fork is arranged on the flail block swinging body and rotatably connected to the gear; the shifting block is rotatably arranged on the shaft body and provided with a working end and a driving end, and the driving end is arranged in the shifting fork in a clamped mode; and the shaft body and the gear are fixedly connected and arranged in a separated mode. According to the camshaft, an exhaust valve can be opened to a certain extent when an engine dies, so that the air compression ratio is decreased, the pressure can be low when the engine is started next time, and accordingly the engine can be started conveniently. In addition, after the engine is started, a pressure reduction mechanism stops the pressure reduction function automatically so that an internal combustion engine can operate normally, and using is easy and convenient.
Description
Technical field
The invention belongs to camshaft technical field, it is related to a kind of camshaft.
Background technology
Engine piston can stop, and is because that piston two ends stress reaches one and puts down
Weighing apparatus.After engine misses, due to inertia, crank connecting link piston mechanism also to continue into
Row is reciprocal to move up and down.Cylinder end valve normal switch it is clear that when being in compression stroke,
Due to entering, valve be to close, cylinder pressure can not voluntarily discharge reduction.Piston stops
Now cylinder internal gas pressure is of a relatively high for position, and next circulation needs to start wink when electromotor
Between, need to suck new gas and be compressed, near compression terminal, can produce very big
Resistance to compression pression, if not reduced pressure to cylinder internal gas pressure and directly initiating, will be very
Difficult, particularly foot starts, especially even more so to large-duty engine.
In addition, camshaft enters always under high rotating speed, high temperature, the working condition of high abrasion
Row work, simultaneously cam there is complex-shaped, poor rigidity, the high spy of requirement on machining accuracy
The difficult point that point, always gasoline engine parts manufacture, and manufacturing cost is higher, at present
General purpose petrol engine cam axle assembly more than 99% is all using alloy cast iron, unit manufacturing cost
More than 20 yuan/.
Older engines rotating speed is low, and cam face specific contact pressure is low, so to camshaft
Material is typically hardened using medium carbon steel, just can meet sliding speed and the contact stress of cam
Requirement.Improve constantly with engine speed, the reinforcement of valve spring elasticity, cam
Load changes a lot, so mostly adopting spheroidal graphite cast-iron, production cost mistake at present
Height, and weight weight.
Content of the invention
The purpose of the present invention is above-mentioned to ask for existing during existing engine start
Topic, and propose a kind of decompression exhaust before engine misses, it is easy to start next time and become
This low, lightweight camshaft.
The purpose of the present invention can be realized by following technical proposal:
A kind of camshaft, including axis body, axis body be provided with admission cam, exhaust cam,
Gear and decompressor are it is characterised in that described decompressor includes being arranged on gear
Get rid of block pendular body, shifting block and resetting-mechanism towards this side of exhaust cam, get rid of block and swing
Body is provided with a shift fork and is rotatably connected on described gear, and described shifting block can turn
It is arranged on axis body dynamicly, shifting block has working end and drive end, described drive end
It is fastened in shift fork, described axis body is fixedly connected with gear and both are in that split is arranged.
In a kind of above-mentioned camshaft, described resetting-mechanism includes back-moving spring, multiple
One end of position spring is connected with getting rid of block pendular body, and the other end is connected with gear.
In a kind of above-mentioned camshaft, described get rid of block pendular body and be provided with one be easy to
The hook that back-moving spring is attached.
In a kind of above-mentioned camshaft, the described block pendular body that gets rid of is in " c " shape, one
End is connected with pinion rotation.
In a kind of above-mentioned camshaft, described back-moving spring and get rid of block pendular body with
The rotation junction point of gear is located at the same side of axis body.
In a kind of above-mentioned camshaft, described axis body, admission cam and exhaust cam
It is integral structure.
Compared with prior art, this camshaft can be in engine dies exhaust valve
Open a bit, reduce air compression ratio, pressure can be made lighter when starting next time, just
In starting.And, after engine start, the mechanism of decompressor sheds decompression automatically, with
Just internal combustion engine normal work, simple and convenient.Achieve the split design of axis body and gear,
Carry out that general assembly is integrated to be changed existing camshaft manufacturing and integrally adopt after polish
Cast iron cast-in-block process, low cost, lightweight, not only increase processing effect
Rate, passes through to change material simultaneously and mechanical mechanism improves cam performance.
Brief description
Fig. 1 is structural representation provided by the present invention.
Fig. 2 is overlooking the structure diagram provided by the present invention.
Fig. 3 is the structural representation of axis body.
In figure, 1, axis body；2nd, admission cam；3rd, exhaust cam；4th, gear；5、
Get rid of block pendular body；51st, shift fork；6th, back-moving spring；62nd, link up with；7th, shifting block；71、
Working end；72nd, drive end；8th, shifting block rivet；9th, get rid of block rivet；10th, spring riveting
Nail；11st, exhaust valve tappet.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, the technical side to the present invention
Case is further described, but the present invention is not limited to these embodiments.
As shown in figure 1, this camshaft includes axis body 1, axis body 1 be provided with admission cam 2,
Exhaust cam 3, gear 4 and decompressor, gear 4 towards exhaust cam 3 this
Side is additionally provided with gets rid of block pendular body 5 and back-moving spring 6, gets rid of block pendular body 5 and is provided with one group
Fork 51.One shifting block 7 is additionally provided with the axis body 1 between gear 4 and exhaust cam 3, dials
Block 7 is passed through a shifting block rivet 8 and is connected with axis body 1 rotation, and described shifting block 7 has work
Make end 71 and drive end 72, drive end 72 is fastened on the above-mentioned shift fork getting rid of block pendular body 5
In 51.Axis body 1 is fixedly connected with gear 4 and both are in that split is arranged,
As shown in Fig. 2 getting rid of block pendular body 5 is in " c " shape, its one end gets rid of block by one
Rivet 9 and gear 4 activity riveting；A spring rivet is passed through in one end of back-moving spring 6
10 are fixedly connected with gear 4, and the other end is buckled in a hook 62 getting rid of on block pendular body 5
On, get rid of block rivet 9 and back-moving spring 6 is located at the same side of axis body 1.As shown in figure 3,
Gear 4 is made using polyamide fiber material, is provided between axis body 1 and gear 4
Clamping mechanism, this clamping mechanism is the bayonet socket being opened in axis body 1 surface, said gear 4
Adopt Shooting Technique one-shot forming in the bayonet socket position of axis body 1, bayonet socket includes annular slot
1a and hole clipping 1b being arranged on draw-in groove 1a bottom.Axis body 1, admission cam 2 and aerofluxuss
Cam 3 is integral structure, is formed using cast iron materials casting.
Before engine start, shifting block 7 is in state as shown in Figure 1, now shifting block 7
Working end 71 is higher than cam base circle, is stuck between exhaust cam 3 and exhaust valve tappet 11,
Exhaust valve tappet 11 can not return completely, allow exhaust valve to be in when electromotor is static with this
Open mode.
After engine start, axis body 1 and gear 4 quickly rotate, when reaching certain rotating speed
When, get rid of block pendular body 5 and rotate around getting rid of block rivet 9 under the action of the centrifugal force, and by dialling
Shifting block 7 stirred by fork 51, so that shifting block 7 is rotated counterclockwise as shown in Figure 1, shifting block 7
Working end 71 do circular motion, away from exhaust valve tappet 11, make exhaust valve tappet 11
Can return completely, when therefore engine start is to normal work, this decompressor is not
Disturb state during engine work, now back-moving spring 6 is stretched.
When to stall, engine speed slowly reduces, and gets rid of suffered by block pendular body 5
Centrifugal force reduces.Now due to the reset response of back-moving spring 6, when rotating speed drops to necessarily
During degree, get rid of block pendular body 5 and reset, now shifting block 7 turning clockwise shown in along Fig. 1
Dynamic reset exceeds cam base circle position so as to working end 71 is located at again, is stuck in exhaust valve
Between tappet 11 and exhaust cam 3, so that exhaust valve is opened, release air, reduce air
Compression ratio reaches the purpose being easy to start then.
Specific embodiment described herein is only theory for example to present invention spirit
Bright.Those skilled in the art can be to described specific embodiment
Make various modifications or supplement or substituted using similar mode, but without departing from
The spirit of the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of camshaft, including axis body (1), axis body (1) is provided with admission cam
(2), exhaust cam (3), gear (4) and decompressor are it is characterised in that described
Decompressor include being arranged on gear (4) getting rid of towards exhaust cam (3) this side
Block pendular body (5), shifting block (7) and resetting-mechanism, get rid of block pendular body (5) and are provided with
One shift fork (51) and being rotatably connected on described gear (4), described shifting block (7)
Be rotatably arranged on axis body (1), shifting block (7) has working end (71) and
Drive end (72), described drive end (72) is fastened in shift fork (51), described
Axis body (1) is fixedly connected with gear (4) and both are in that split is arranged.
2. a kind of camshaft according to claim 1 is it is characterised in that described
Resetting-mechanism includes back-moving spring (6), one end of back-moving spring (6) with get rid of block pendular body
(5) connect, the other end is connected with gear (4).
3. a kind of camshaft according to claim 2 is it is characterised in that described
Get rid of block pendular body (5) and be provided with one and be easy to the hook that back-moving spring (6) is attached
(62).
4. a kind of camshaft according to claim 1 or 2 or 3 it is characterised in that
The described block pendular body (5) that gets rid of is in " c " shape, and its one end is rotated with gear (4) and is connected.
5. a kind of camshaft according to claim 2 is it is characterised in that described
Back-moving spring (6) and the rotation junction point position getting rid of block pendular body (5) and gear (4)
The same side in axis body (1).
6. a kind of camshaft according to claim 1 or 2 or 3 it is characterised in that
Described axis body (1), admission cam (2) and exhaust cam (3) are integral type knot
Structure.
7. a kind of camshaft according to claim 1 is it is characterised in that described
Gear (4) is made using polyamide fiber material.
8. a kind of camshaft according to claim 1 and 2 is it is characterised in that institute
It is provided with clamping mechanism, this clamping mechanism is to open between the axis body (1) stated and gear (4)
It is located at the bayonet socket on axis body (1) surface, said gear (4) is in the bayonet socket position of axis body (1)
Put using Shooting Technique one-shot forming.
9. a kind of camshaft according to claim 8 is it is characterised in that described
Bayonet socket includes annular slot (1a) and the hole clipping (1b) being arranged on draw-in groove (1a) bottom.
10. a kind of camshaft according to claim 1 or 7 it is characterised in that
Described axis body (1), admission cam (2) and exhaust cam (3) are integral type knot
Structure, is formed using cast iron materials casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510418935.6A CN106337702A (en) | 2015-07-16 | 2015-07-16 | Camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510418935.6A CN106337702A (en) | 2015-07-16 | 2015-07-16 | Camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106337702A true CN106337702A (en) | 2017-01-18 |
Family
ID=57826624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510418935.6A Pending CN106337702A (en) | 2015-07-16 | 2015-07-16 | Camshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106337702A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578572A (en) * | 2019-09-04 | 2019-12-17 | 天津内燃机研究所（天津摩托车技术中心） | Camshaft starting pressure reducing mechanism |
| CN113153480A (en) * | 2021-06-08 | 2021-07-23 | 含山县大颉机械有限公司 | Engine camshaft pressure reducing mechanism |
-
2015
- 2015-07-16 CN CN201510418935.6A patent/CN106337702A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578572A (en) * | 2019-09-04 | 2019-12-17 | 天津内燃机研究所（天津摩托车技术中心） | Camshaft starting pressure reducing mechanism |
| CN113153480A (en) * | 2021-06-08 | 2021-07-23 | 含山县大颉机械有限公司 | Engine camshaft pressure reducing mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170118 |