CN201953429U - Engine with pressure-reducing device - Google Patents
Engine with pressure-reducing device Download PDFInfo
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- CN201953429U CN201953429U CN2011200944965U CN201120094496U CN201953429U CN 201953429 U CN201953429 U CN 201953429U CN 2011200944965 U CN2011200944965 U CN 2011200944965U CN 201120094496 U CN201120094496 U CN 201120094496U CN 201953429 U CN201953429 U CN 201953429U
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- engine
- decompressor
- cam
- pressure
- tool
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Abstract
The utility model relates to an engine with a pressure-reducing device, which comprises a camshaft, a centrifugal balance weight block, a slide rod, an elastic piece and a pressure-reducing rod, wherein the cam shaft is provided with a radial through hole; the centrifugal balance weight block is provided with a first gear part; the slide rod outwards extends from the centrifugal balance weight block and then passes through the radial through hole; the elastic piece is abutted against the slide rod; and the pressure-reducing rod is provided with a cam part and a second gear part. The outer circumference of the camshaft is fixedly provided with a valve-actuated cam. The second gear part of the pressure-reducing rod is meshed with the first gear part of the centrifugal balance weight block, and the cam part rotates along with the slide of the centrifugal balance weight block to be higher or lower than the outer border of the valve-actuated cam. Therefore, the centrifugal balance weight block slides in a gear rack transmission mode to drive the pressure-reducing rod to selectively exert the function of pressure reduction. The engine with the pressure-reducing device has the advantages that the engine can shorten the required length of a shaft piece to effectively reduce the integral size of a mechanism, has simple structure and less used part than that of the conventional device, and therefore, assembling steps are also reduced.
Description
Technical field
The utility model relates to a kind of engine, refers to that especially a kind of tool driven in translation relief cam characteristic has the engine of decompressor.
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 engine will restart, piston in the cylinder moves to the firing chamber, at this moment, and 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 artificial application of force startup with electric motor, all must provide is enough to overcome the indoor gas pressure of previous combustion.If start with electric motor, then must to be designed to torsion big and can't miniaturization for electric motor; If start with the artificial application of force again, for example the occasion that starts the engine in the mode of trampling at need then can cause trampling difficult and the burden increase user.
For at above-mentioned stress problems, some engine can be installed so-called decompressor at present, and it can reduce the compression pressure of engine when starting, 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 centrifugal 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 is with many link design person mostly, 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, and because of being arranged at the camshaft end, need to use long shaft component, be unfavorable for that overall dimensions miniaturization and cost are higher.
The model utility content
The purpose of this utility model provides a kind of engine of tool decompressor, to dwindle mechanism's overall dimensions and device space; Its profile is simple, makes easily.
The purpose of this utility model is achieved in that the engine of tool decompressor comprises a camshaft, a governor weight piece, a sliding bar, an elastic component and a decompression lever.Above-mentioned camshaft is installed with a valve actuation cam in periphery, and includes a perforation radially; Above-mentioned governor weight piece includes one first tooth portion.
Above-mentioned sliding bar stretches out from the governor weight piece and passes radially perforation and with governor weight piece slip.Above-mentioned elastic component is resisted against sliding bar, bestows a pre-power.
Above-mentioned decompression lever includes a cam part and one second tooth portion, wherein the second tooth portion is engaged in the first tooth portion of governor weight piece, follow the rotation of the slip drive decompression lever of governor weight piece, make the decompression lever cam part turn to the gabarit that is higher or lower than the valve actuation cam.
Above-mentioned governor weight piece can be concaved with a jack, and sliding bar is removably to be plugged on jack, and so design is convenient to the assembling of organ.Above-mentioned camshaft can more be installed with a location flange in periphery, is adjacent to the governor weight piece, in order to the rotation of restriction governor weight piece.Locating flange more can be provided with a flange hole, and the valve actuation cam also can include a containing groove, makes decompression lever pass flange hole, and cam part is placed in containing groove.
More include one first axle journal and second axle journal on the above-mentioned camshaft, and above-mentioned decompressor is between first axle journal and second axle journal.Above-mentioned elastic component can be a spring.
The utility model designs by said mechanism, the governor weight piece 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.Governor weight piece profile particularly of the present utility model is simple, makes easily, and is difficult for because of rotating the situation of load generation material damage.
Description of drawings
Fig. 1 is the engine sectional view of the utility model first preferred embodiment.
Fig. 2 is the decompressor exploded view of the utility model first preferred embodiment.
Stereogram when Fig. 3 A is the decompressor performance decompression of the utility model first preferred embodiment.
Fig. 3 B is the decompressor of the utility model first preferred embodiment stereogram when not bringing into play decompression.
Sectional view when Fig. 4 A is the decompressor performance decompression of the utility model first preferred embodiment.
Fig. 4 B is the decompressor of the utility model first preferred embodiment sectional view when not bringing into play decompression.
The schematic representation of decompression lever jacking rocking arm when Fig. 5 A is the decompressor performance decompression of the utility model first preferred embodiment.
Fig. 5 B is the schematic representation of the decompressor of the utility model first preferred embodiment not jacking of decompression lever rocking arm when not bringing into play decompression.
Fig. 6 is the utility model second embodiment's a decompressor exploded view.
The primary component symbol description
Crankcase 13 cylinder head loam cakes 14
Cylinder head side cover 15 piston rod groups 16
Camshaft 21 is perforation 211 radially
Stop surface 212 axle journals 213,214
Jack 242 positioning parts 243
Decompression lever 25 cam part 251
The second tooth portion, 252 sliding bars 26
Pass through portion's 263,51 elastic components 27
Locating flange 28 flange holes 281
Driving wheel 31 rocking arms 32,33
Second bearing, 36 fixed bases 37
Embodiment
With reference to figure 1, Fig. 2, Fig. 3 A, be respectively an embodiment engine sectional view, decompressor exploded view, and decompressor stereogram.Fig. 1 illustrates an engine structure, and engine mainly comprises a cylinder head 11, a cylinder block 12 and a crankcase 13 that links in regular turn.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 camshaft 21 comprises decompressor and is arranged at cylinder head 11 inside, and a piston rod group 16 is arranged at cylinder block 12 inside, and a 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.
Decompressor is arranged at above-mentioned camshaft 21, includes a governor weight piece 24, a decompression lever 25, a sliding bar 26 and an elastic component 27.Camshaft 21 has formed the rocking arm 32,33 of two valve actuation cams 22,23 and a location flange 28, two valve actuation cams 22,23 responsible pushing tow correspondences in periphery, and then makes drain tap and air intake valve (figure does not show) produce displacement.
Other has a clutch shaft bearing 35 and one second bearing 36 is the boundary with valve actuation cam 22,23 respectively, is mounted on two axle journals 213,214 of camshaft 21.Camshaft 21 also is installed with a driving wheel 31 (fixing with respect to camshaft 21 through a fixed base 37) in end.Driving wheel 31 is to see through a driving component 34 as the power of chain reception from crank mechanism 17, makes camshaft 21 rotate synchronously.
Need that the portion of passing through 263 of sliding bar 26 passed elastic component 27 and pass the jack 242 that perforation 211 radially is plugged on governor weight piece 24 at last from the outside, elastic component 27 (this example is a spring) then is resisted against stop surface 212 and head 261 respectively.27 pairs of sliding bars 26 of elastic component are bestowed an outside pre-power.
Locating flange 28 is adjacent to governor weight piece 24, can bring into play the function that restriction governor weight piece 24 rotates.Locating flange 28 is axially arranged with a flange hole 281, and decompression lever 25 passes flange hole 281 makes cam part 251 be placed in the containing groove 221 of valve actuation cam 22.
When the second tooth portion 252 of decompression lever 25 was engaged in the first tooth portion 241, the first tooth portion can bring into play backstop action in 241 other positioning parts 243 when decompression lever 25 moves axially tendency, reach decompression lever 25 axially locating purposes.
With reference to figure 3A, Fig. 4 A, Fig. 5 A, be respectively the schematic representation of stereogram, sectional view and the decompression lever jacking rocking arm of decompressor when the performance decompression.When engine is lower than specific rotation speeds or shuts down, sliding bar 26 is inclined to because of the application of force of elastic component 27 and skids off radially perforation 211, certainly simultaneously also drive governor weight piece 24 and do identical sliding motion, the slippage limit is the position of governor weight piece 24 when being resisted against camshaft 21.Decompression lever 25 produced and pivoted, and makes cam part 251 be exposed to containing groove 221, also is equivalent to be higher than the gabarit of valve actuation cam 22 by the bidentate portion 241,252 that is meshed this moment.Thus, cam part 251 also can touch rocking arm 32 certainly and with it jacking, bring into play decompression.
With reference to figure 3B, Fig. 4 B, Fig. 5 B, be respectively the schematic representation of stereogram, sectional view and the decompression lever not jacking rocking arm of decompressor when not bringing into play decompression.When engine running to a specific rotation speeds is above, sliding bar 26 and governor weight piece 24 suffered centrifugal force make its application of force that is enough to resist elastic component 27 and along and above-mentioned opposite direction slippage, the slippage limit be the position of blocked part 262 when being resisted against stop surface 212 as described above.Decompression lever 25 produced and pivoted, and makes cam part 251 be built in containing groove 221, also is equivalent to be lower than the gabarit of valve actuation cam 22 by the bidentate portion 241,252 that is meshed this moment.Thus, cam part 251 is not with top on the rocking arm 32, no decompression.
From the above, the principle control decompression lever that mechanism design of the present utility model makes the sliding motion of governor weight piece see through the gear rack motion rotates, with selecting type performance engine decompression.
Advantage of the present utility model is the stub member Len req that can contract, and effectively dwindles mechanism's overall dimensions, and simple in structure, used part is more known few, and also therefore number of assembling steps reduces.
With reference to figure 6, be second embodiment's decompressor exploded view.This example structurally with the difference of first example be in, sliding bar is to be made of with cap 52 portion of passing through 51 that separates.It is one-body molded with governor weight piece 50 to pass through portion 51, is the radially perforation 211 that the portion of passing through 51 is passed camshaft 21 during assembling, is screwed on the portion's of passing through 51 end thread with cap 52 again.Radially contract in the perforation 211 when moving to a degree when the portion of passing through 51, cap 52 is resisted against stop surface 212 and stops, and constitutes the displacement limits of sliding bar one direction.Certainly, the stop face 212 of cap 52 and camshaft 21 is replaced at elastic component 27 two ends respectively in this situation.
Claims (8)
1. the engine of a tool decompressor is characterized in that comprising:
One camshaft is installed with a valve actuation cam in periphery, and includes a perforation radially;
One governor weight piece includes one first tooth portion;
One sliding bar, this governor weight piece stretches out and passes this radially perforation certainly;
One elastic component is resisted against this sliding bar; And
One decompression lever includes a cam part and 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 turned to the gabarit that is higher or lower than this valve actuation cam.
2. the engine of tool decompressor as claimed in claim 1 is characterized in that this governor weight piece is concaved with a jack, and this sliding bar is to be plugged on this jack.
3. the engine of tool decompressor as claimed in claim 1 is characterized in that this camshaft more is installed with a location flange in periphery, is adjacent to this governor weight piece.
4. the engine of tool decompressor as claimed in claim 3 is characterized in that this locating flange is provided with a flange hole, and this decompression lever passes this flange hole.
5. the engine of tool decompressor as claimed in claim 1 it is characterized in that this valve actuation cam includes a containing groove, and this cam part is placed in this containing groove.
6. the engine of tool decompressor as claimed in claim 1 is characterized in that more including on this camshaft one first axle journal and one second axle journal, and this governor weight piece is between this first axle journal and second axle journal.
7. the engine of tool decompressor as claimed in claim 1 is characterized in that this decompression balancing weight more includes a positioning part to restrain the axial displacement of this decompression lever.
8. the engine of tool decompressor as claimed in claim 1 is characterized in that this elastic component is a spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200944965U CN201953429U (en) | 2011-03-31 | 2011-03-31 | Engine with pressure-reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200944965U CN201953429U (en) | 2011-03-31 | 2011-03-31 | Engine with pressure-reducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201953429U true CN201953429U (en) | 2011-08-31 |
Family
ID=44497546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200944965U Expired - Fee Related CN201953429U (en) | 2011-03-31 | 2011-03-31 | Engine with pressure-reducing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201953429U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564214A (en) * | 2015-01-16 | 2015-04-29 | 重庆大江动力设备制造有限公司 | Novel general gasoline engine camshaft pressure reducing valve |
| TWI655360B (en) * | 2017-06-29 | 2019-04-01 | 三陽工業股份有限公司 | Engine with decompression device |
-
2011
- 2011-03-31 CN CN2011200944965U patent/CN201953429U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104564214A (en) * | 2015-01-16 | 2015-04-29 | 重庆大江动力设备制造有限公司 | Novel general gasoline engine camshaft pressure reducing valve |
| TWI655360B (en) * | 2017-06-29 | 2019-04-01 | 三陽工業股份有限公司 | Engine with decompression device |
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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 |
Granted publication date: 20110831 Termination date: 20190331 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |