CN202039914U - Engine decompression mechanism - Google Patents
Engine decompression mechanism Download PDFInfo
- Publication number
- CN202039914U CN202039914U CN2011201367908U CN201120136790U CN202039914U CN 202039914 U CN202039914 U CN 202039914U CN 2011201367908 U CN2011201367908 U CN 2011201367908U CN 201120136790 U CN201120136790 U CN 201120136790U CN 202039914 U CN202039914 U CN 202039914U
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- China
- Prior art keywords
- decompressor
- weight piece
- governor weight
- engine
- decompression
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- Expired - Fee Related
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Abstract
The utility model relates to an engine decompression mechanism, which is characterized by comprising a cam shaft, a body fixedly arranged on the cam shaft, a centrifugal weight block slidingly arranged on the body, an elastic part and a decompression rod, wherein a valve actuation cam is fixedly arranged on the cam shaft; and one end of the elastic part butts against the centrifugal weight block and exerts a prestress along the direction parallel to the sliding direction of the centrifugal weight block. The decompression rod comprises a cam part and a second tooth part, wherein the second tooth part meshes with a first tooth part, and the cam part rotates along with the sliding of the centrifugal weight block. In the engine decompression mechanism, the weight block slides and drives the decompression rod to selectively play a decompression role in a gear rack transmission manner; the entire size of the mechanism is reduced; and the number of parts is reduced.
Description
Technical field
The utility model relates to a kind of engine mechanism of decompressor, refers to a kind of engine mechanism of decompressor that utilizes the gear rack motion principle to activate especially.
Background technique
When cutting the engine,,, stop at last there being many impedance meetings to cause rotating under the gradual slow among this process because the effect of inertia that bent axle is rotatablely moved makes engine can continue to rotate some revolutions.Wherein Zui Da impedance is the compression pressure of compression stroke, therefore often makes engine be subjected to the effect of this compression pressure and counter-rotating after causing normal rotation to stop, and stops then.
When internal-combustion engine will restart, piston in the cylinder is to move to the firing chamber, at this moment, because of the suction valve of air intake valve connecting rod and the outlet valve of drain tap connecting rod all are in closed condition, so piston is when mobile, must overcome extruded gas pressure to finish the mobile of remainder the firing chamber in.That is no matter be to start or the artificial application of force starts with electric motor, all must provide is enough to overcome the indoor gas pressure of previous combustion, if otherwise start with electric motor, then must to be designed to horsepower big and can't miniaturization for electric motor; If start with the artificial application of force again, for example trample to start the occasion of locomotive engine at need, then can cause trampling difficult and the burden increase user.
For at above-mentioned stress problems, some internal-combustion engine can be installed so-called decompressor at present, and it can reduce internal-combustion engine in the pressure that starts, to avoid the generation of the problems referred to above.
As everyone knows, in order to reduce above-mentioned compression pressure problem, some engine can be installed the clutch type decompressor, the centrifugal force size that the governor weight piece is produced when rotating by camshaft specific rotation speeds more than then loses effect of easing stress for decompression is arranged at this with time control decompressor in specific rotation speeds.
Known decompressor mostly is many link design greatly, and it is to adopt linkage mechanism to drive relief cam to reach engine decompression purpose that known techniques is for example arranged.Above-mentioned known decompressor is found in a day disclosure special permission communique spy and drives disclosed decompressor 2006-144627 number, this decompressor mechanism complexity, transmission fulcrum are too much so polarization is not good, and because of being arranged at the camshaft end, need to use long shaft component, be unfavorable for the overall dimensions miniaturization.
The model utility content
The purpose of this utility model provides a kind of engine mechanism of decompressor, and it slides balancing weight with the gear rack kind of drive and drives decompression lever selecting type performance pressure-reducing function, can reduce mechanism's overall dimensions.
The purpose of this utility model is achieved in that the engine mechanism of decompressor comprises a camshaft, a body, a governor weight piece, the living part of a bullet and a decompression lever.Above-mentioned camshaft is installed with a valve actuation cam, and body is to be fixedly arranged on camshaft.
Above-mentioned governor weight piece is slidedly arranged on body, includes one first tooth portion.Elastic component one end is resisted against the governor weight piece and bestows a pre-power along the direction that is parallel to the slip of governor weight piece.
Above-mentioned decompression lever includes a cam part, and one second tooth portion, and wherein the second tooth portion is engaged in the first tooth portion, and cam part follows the slip of governor weight piece and rotate, with selecting type performance pressure-reducing function.
Design by said mechanism, the governor weight piece of the mechanism of decompressor drives decompression lever except the mode that is different from known rotation with novelty, it is sliding movement, the also more known jointed gear unit of the utilization of gear drive has the advantage of simplicity of design, simultaneously can reach the governor weight piece and move small distance and can make decompression lever rotate needed angle, reach the purpose of dwindling mechanism's overall dimensions and device space easily by the dimensional configurations relation of gear drive.In addition, utilize the utility model more can realize the still less not limited purpose of part number, arrangement of components.
Above-mentioned body can axially provide a perforation, and decompression lever passes perforation to avoid any displacement.Above-mentioned elastic component can be a spring.Body axially projection has a holding base to accommodate elastic component.Above-mentioned holding base can have a L type sidewall, and the governor weight piece can more to include a slide part be against sliding against L type sidewall.Above-mentioned camshaft can include a driving wheel in end, and can more include a clutch shaft bearing on the camshaft is between driving wheel and body.Can more include one second bearing on the camshaft is to be positioned at another end opposite with driving wheel.
The engine mechanism of decompressor can more include cover plate system and body common axle to contained governor weight piece.
The utility model has the advantages that with the gear rack kind of drive balancing weight being slided drives decompression lever selecting type performance pressure-reducing function, the stub member Len req that can contract effectively dwindles mechanism's overall dimensions, and used part is more known less, also therefore number of assembling steps reduces.
Description of drawings
Fig. 1 is the locomotive engine sectional view of the utility model one preferred embodiment.
Fig. 2 is the mechanism of decompressor exploded view of the utility model one preferred embodiment.
Fig. 3 is the mechanism of decompressor sectional view of the utility model one preferred embodiment.
Fig. 4 is a mechanism of decompressor front elevation under the engine decompression.
Fig. 5 is a mechanism of decompressor rear view under the engine decompression.
Fig. 6 is that engine does not have mechanism of decompressor front elevation under the decompression.
Fig. 7 is that engine does not have mechanism of decompressor rear view under the decompression.
The primary component symbol description
Crankcase 13 cylinder head loam cakes 14
Cylinder head side cover 15 piston rod groups 16
Camshaft 21 valve actuation cams 22,23
First butting section, 244 fixed holes 245
The 246 governor weight pieces 25 of boring a hole
The first tooth portion, 251 first slide parts 252
Second slide part, 253 force sides 254
Bullet is given birth to part 26 decompression levers 27
Second bearing, 30 driving wheels 31
Embodiment
With reference to figure 1～3, be respectively an embodiment locomotive engine sectional view, mechanism of decompressor exploded view, and mechanism of decompressor sectional view.Fig. 1 illustrates the engine structure of a locomotive, and locomotive engine mainly comprises in regular turn the cylinder head 11 that links, a cylinder block 12, an and crankcase 13.One cylinder head loam cake 14 is incorporated into cylinder head 11 tops, and a cylinder head side cover 15 is incorporated into by cylinder head 11 sides.One mechanism of decompressor (comprising camshaft 21) is arranged at cylinder head 11 inside, one piston rod group 16 is arranged at cylinder block 12 inside, one crank mechanism 17 is arranged at crankcase 13 inside, and crank mechanism 17 also is linked to a driving mechanism 18 so that rotating power is passed.
The mechanism of decompressor more includes a body 24, a governor weight piece 25, an elastic component 26, a decompression lever 27 and a cover plate 28 except that above-mentioned camshaft 21.Formed two valve actuation cams 22,23 on the camshaft 21, be responsible for the rocking arm 32,33 of pushing tow correspondence, and then made drain tap and air intake valve (figure does not show) produce displacement.Camshaft 21 is installed with a driving wheel 31 in end, sees through a driving component 34 as the power of Chain bar reception from crank mechanism 17, makes camshaft 21 rotate synchronously.
It is other that cover plate 28 is mounted on governor weight piece 25, in the middle of body 24 is sandwiched in governor weight piece 25, has the function that prevents that governor weight piece 25 and elastic component 26 axially break away from.
In addition, be provided with a clutch shaft bearing 29, be provided with one second bearing, 30, the second bearings 30 in outermost valve actuation cam 23 other groups and lay respectively at two opposite ends of camshaft with driving wheel 31 in cover plate 28 other groups again.
With reference to figure 4 and Fig. 5.When locomotive engine was lower than specific rotation speeds or shuts down, governor weight piece 25 caused force side 254 towards groove 242 outside moving because of the application of force of elastic component 26.This moment, decompression lever 27 was switched to a primary importance by the bidentate portion 251,272 that is meshed, that is cam part 271 is higher than the state of valve actuation cam 22 basic circles, as the height difference H that indicates among the figure, therefore can be on the rocking arm 32 top, performance engine decompression.On the other hand, governor weight piece 25 is fastened in body 24 in this stage, must not worry the situation of radially deviating from through suitable body design.Arrow is depicted as the movement direction of governor weight piece 25 among the figure.
With reference to figure 6 and Fig. 7.When the locomotive engine running was above to a specific rotation speeds, governor weight piece 25 suffered centrifugal force made it be enough to resist the application of force of elastic component 26 and cause force side 254 towards groove 242 inner moving.This moment, decompression lever 27 was switched to a second place by the bidentate portion 251,272 that is meshed, that is cam part 271 is lower than the state of valve actuation cam 22 basic circles, will be on the rocking arm 32 top, no engine decompression.Similarly, governor weight piece 25 also is designed to fasten in body 24 in this stage and can radially deviate from.Arrow is depicted as the movement direction of governor weight piece 25 among the figure.
From the above, mechanism design of the present utility model make the governor weight piece with its slide part against the butting section that slides against body, and then the principle control decompression lever that sees through the gear rack motion rotates, with selecting type performance engine decompression.
Claims (9)
1. engine mechanism of decompressor is characterized in that comprising:
One camshaft is installed with a valve actuation cam on it;
One body is fixedly arranged on this camshaft;
One governor weight piece is slidedly arranged on this body, includes one first tooth portion;
One elastic component, an end are resisted against this governor weight piece and bestow a pre-power along the direction that is parallel to this governor weight piece slip; And
One decompression lever includes a cam part, reaches one second tooth portion, and this second tooth portion is engaged in this first tooth portion, and this cam part is followed the slip of this governor weight piece and rotated.
2. the engine mechanism of decompressor as claimed in claim 1 is characterized in that this body shaft to having provided a perforation, and this decompression lever passes this perforation.
3. the engine mechanism of decompressor as claimed in claim 1 is characterized in that this camshaft includes a driving wheel in an end.
4. the engine mechanism of decompressor as claimed in claim 3, it is characterized in that including on this camshaft a clutch shaft bearing is between this driving wheel and this body.
5. the engine mechanism of decompressor as claimed in claim 4, it is characterized in that including on this camshaft one second bearing is to be positioned at another end opposite with this driving wheel.
6. the engine mechanism of decompressor as claimed in claim 1 is characterized in that this elastic component is a spring.
7. the engine mechanism of decompressor as claimed in claim 1, it is characterized in that more including a cover plate and be with this body common axle to contained this governor weight piece.
8. the engine mechanism of decompressor as claimed in claim 1 is characterized in that this body shaft has a holding base to accommodate this elastic component to projection.
9. the engine mechanism of decompressor as claimed in claim 8 is characterized in that this holding base has a L type sidewall, and it is against sliding against this L type sidewall that this governor weight piece includes a slide part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201367908U CN202039914U (en) | 2011-04-29 | 2011-04-29 | Engine decompression mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201367908U CN202039914U (en) | 2011-04-29 | 2011-04-29 | Engine decompression mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202039914U true CN202039914U (en) | 2011-11-16 |
Family
ID=44967363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201367908U Expired - Fee Related CN202039914U (en) | 2011-04-29 | 2011-04-29 | Engine decompression mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202039914U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914963A (en) * | 2021-11-03 | 2022-01-11 | 江门市大长江集团有限公司 | Engine and pressure reducing rocker arm |
-
2011
- 2011-04-29 CN CN2011201367908U patent/CN202039914U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914963A (en) * | 2021-11-03 | 2022-01-11 | 江门市大长江集团有限公司 | Engine and pressure reducing rocker arm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20180429 |