CN201908739U - Engine cylinder head with decompression device - Google Patents
Engine cylinder head with decompression device Download PDFInfo
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- CN201908739U CN201908739U CN201020701251XU CN201020701251U CN201908739U CN 201908739 U CN201908739 U CN 201908739U CN 201020701251X U CN201020701251X U CN 201020701251XU CN 201020701251 U CN201020701251 U CN 201020701251U CN 201908739 U CN201908739 U CN 201908739U
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- decompression
- pressure relief
- camshaft
- relief mechanism
- cylinder head
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Abstract
The utility model relates to an engine cylinder head with a decompression device, which comprises a camshaft, a camshaft driving piece fixed at the camshaft, a centrifugal block pivoted at the camshaft driving piece, and a plurality of decompression components arranged in the camshaft. The camshaft comprises at least two valve motion cams and a plurality of decompression groove holes. The centrifugal block comprises a plurality of driving parts. Every decompression component comprises a driven part correspondingly propped against one driving part, and a decompression action part correspondingly accommodated in one decompression groove hole. The centrifugal block is pivoted in a rotary way between a first position and a second position, so as to enable the driving part to drive the driven part to prevent the decompression action part from protruding out of the valve motion cams or enable the decompression action part to protrude out of the valve motion cams. As a result, the engine cylinder head with the decompression device is applicable to a multi-cylinder engine, and is not difficult to assemble.
Description
Technical field
The utility model relates to a kind of engine decompressor, refers to a kind of engine cylinder head decompressor that is applicable to the tool decompressor of multi-cylinder engine especially.
Background technique
After the crankshaft of general four-journey engine stops in cutting the engine, if just be stopped at compression stroke, then next engine restarts because piston carries out the event of compression stroke, piston need bear the gas pressure of firing chamber, that is the torsion that starting motor must provide is bigger, to overcome the startup impedance, this often causes the specification of starting motor and battery to maximize.Again, the rider need impose to trample than big foot legpower amount when starting the engine and start bar, thereby brings inconvenience.For improving above-mentioned shortcoming, existing variously let out the decompressor design that removes, reduces engine start pressure and be suggested, for example bring into play the design of decompression with centrifugal principle.
Japanese patent application publication No. spy opens 2006-70831 and discloses a kind of engine decompressor, it comprises and is positioned at the multistage connecting rod that camshaft is connected in series mutually, the corresponding decompression post that drives of each connecting rod, determine one centrifugal rotation according to the rotating speed of camshaft, and then whether the post that determines simultaneously respectively to reduce pressure is driven and is exposed to camshaft with the performance effect of easing stress by respective link.Therefore this device design can be applied on the multi-cylinder engine.
Yet above-mentioned known decompressor has its shortcoming, and not only Element Design is comparatively complicated with processing, and is also quite difficult in assembling, carries out multiple contraposition in the camshaft because connecting rod need be inserted.
The model utility content
The purpose of this utility model provides a kind of engine cylinder head of tool decompressor, makes component more simple and convenient in assembling.
The purpose of this utility model is that the engine cylinder head of the tool decompressor of realization like this comprises a camshaft, a camshaft actuated part, one centrifugal and plural pressure relief mechanism.Above-mentioned camshaft includes at least two valve actuation cams, reaches plural number decompression slotted eye, and the camshaft actuated part is to be fixed in camshaft and rotation synchronously.
Above-mentioned centrifugal is hubbed at the camshaft actuated part, can be pivoted between a primary importance and the second place.Centrifugal includes plural drive portion.The plural number pressure relief mechanism is to be located in the camshaft, and each pressure relief mechanism includes one and driven portion, an and decompression portion, the corresponding respectively drive portion that is resisted against centrifugal of the portion of being driven, and decompression portion is then corresponding respectively to be contained in the decompression slotted eye of camshaft.
When being positioned at primary importance for centrifugal, the drive portion drive is driven portion and is made decompression portion not protrude from the valve actuation cam gabarit of correspondence separately; When being positioned at the second place for centrifugal, the drive portion drive is driven portion and is made decompression portion protrude from each self-corresponding valve actuation cam gabarit.
The utility model has the advantages that, by said structure, utilize single centrifugal can drive a plurality of pressure relief mechanism effects simultaneously, therefore the utility model can be applicable on the multi-cylinder engine, and more simple and convenient compared to known person in the component assembling, because need not be connected in series the contraposition connecting step of connecting rod.
Above-mentioned pressure relief mechanism can be cammingly pressure relief mechanism or post rod type pressure relief mechanism.The cammingly pressure relief mechanism can include an axis body portion, axis body portion one end forms the portion of being driven of the cammingly pressure relief mechanism of eccentric projection kenel, the other end forms the decompression portion with non-circular cross-section, and makes decompression portion selecting type protrude or not protrude from the valve actuation cam gabarit of correspondence according to the rotation of axis body portion.The pairing drive portion of the portion of being driven of cammingly pressure relief mechanism is a groove.
The post rod type pressure relief mechanism can include a rotating shaft and a push rod.Rotating shaft one end forms the portion of being driven of the post rod type pressure relief mechanism of groove kenel, and the rotating shaft the other end forms an axial projection that is set for the eccentric.Be concaved with a pushing tow groove on the anchor ring of push rod, an end of push rod forms decompression portion, and axial projection is arranged in the pushing tow groove and according to the rotation pushing tow push rod of rotating shaft, decompression portion selecting type is protruded or does not protrude from corresponding valve actuation cam gabarit.The pairing drive portion of the portion of being driven of post rod type pressure relief mechanism is a projection.
The engine cylinder head can more include a position-limit mechanism, makes centrifugal to be limited between the primary importance and the second place.Position-limit mechanism can comprise a limit sliding chutes, with a position limit pin, limit sliding chutes is arranged with in centrifugal, position limit pin is fixed in the camshaft actuated part and is arranged in limit sliding chutes.
The engine cylinder head can more include a reset components, and the one end is resisted against centrifugal, and the other end is resisted against the camshaft actuated part.Reset components can be a torsion spring.Above-mentioned camshaft actuated part can be a sprocket wheel.
Description of drawings
Fig. 1 is the engine cylinder head stereogram of the tool decompressor of the utility model first preferred embodiment.
Fig. 2 is a decompressor exploded view among Fig. 1.
Fig. 3 is the part broken away view after the decompressor assembling.
Fig. 4 is the stereogram of centrifugal decompressor when primary importance.
Fig. 5 is the stereogram of centrifugal decompressor when the second place.
Fig. 6 is that decompressor is made the time spent sectional view.
Fig. 7 is the decompressor planimetric map of second preferred embodiment.
Fig. 8 is the decompressor stereogram of the 3rd preferred embodiment.
The primary component symbol description
Decompressor 8 cylinder head bodies 9
Camshaft 10 first axial chambers 101
The second axial chamber 102 first decompression slotted eyes 103
The second decompression slotted eye, 104 valve actuation cams 11,12
Gabarit 11a, the 12a flange 13 that locks
Camshaft actuated part 14 first pressure relief mechanism 15
152,322 rotating shafts 16 of the first decompression portion
Second is driven portion's 161,331 axial projection 162
172,332 centrifugal 18,31 in the second decompression portion
First drive portion, 181,28 second drive portions 182
Lock part 22,23 spring bearings 24
Valve 26
Embodiment
With reference to figure 1 and Fig. 2, Fig. 1 is the engine cylinder head stereogram of tool decompressor, and Fig. 2 is the decompressor exploded view.Fig. 1 illustrates the cylinder head of a twin-tub engine, has a decompressor 8 to be installed on the cylinder head body 9.As shown in Figure 2, decompressor 8 comprises a camshaft 10,14, one centrifugal 18 of a camshaft actuated part, a reset components 20, one first pressure relief mechanism 15, one second pressure relief mechanism and a position-limit mechanism.
Above-mentioned camshaft 10 includes two valve actuation cams 11 in outer circumferential face, 12, a locking flange 13, and be concaved with two axial chambers 101 in the axial end place, 102, also be concaved with two decompression slotted eyes 103 in outer circumferential face, 104, wherein the first axial chamber 101 is communicated with the first decompression slotted eye, 103, the second axial chambers 102 and is communicated with the second decompression slotted eye 104.Two valve actuation cams 11,12 are corresponding different cylinders respectively, and the first decompression slotted eye 103 is opened on wide 11a surface outside the valve actuation cam 11, the second decompression slotted eye 104 then is in abutting connection with valve actuation cam 12, also can be designed to be opened on the gabarit 12a surface of valve actuation cam 12 certainly.
In 14 examples of camshaft actuated part is a sprocket wheel, is to be locked in locking flange 13 and to be synchronous rotation with camshaft 10 through locking part 22,23, uses driving camshaft 10 rotations.
Passed by a pivot post 19 for centrifugal 18 and be hubbed at camshaft actuated part 14, it includes two drive portions 181,182.Can be pivoted on for centrifugal 18 between a primary importance and the second place, the primary importance and a second place are respectively decompressor and do not act on and do time spent centrifugal 18 position.Aforementioned reset components 20 is a torsion spring, passed by pivot post 19 equally, and an end is resisted against centrifugal 18, and the other end is resisted against camshaft actuated part 14, imposes a pre-power to centrifugal 18 by this, and centrifugal 18 tendency rotated toward the second place.
First pressure relief mechanism 15 is a cammingly pressure relief mechanism, includes an axis body portion 150, one first is driven portion 151 and one first decompression portion 152 from what axis body portion 150 opposite end were extended respectively.The first axial chamber 101, the first that axis body portion 150 is arranged in camshaft 10 is driven portion 151 and is an eccentric projection structure, and the first decompression portion 152 has non-circular cross-section.Centrifugal 18 first drive portion 181 is a groove structure, and above-mentioned first is driven portion 151 promptly is arranged in this groove and stirred by it.
Second pressure relief mechanism is a post rod type pressure relief mechanism, includes a rotating shaft 16 and a push rod 17.Rotating shaft 16 is located in the second axial chamber 102 of camshaft 10, and rotating shaft 16 two ends are respectively and one second are driven portion 161, to be driven portion 161 be an elongate recesses with an axial projection 162, the second, and 162 of axial projection are set for the eccentric.Be concaved with a pushing tow groove 171 on push rod 17 anchor rings, push rod 17 1 ends also form one second decompression portion 172.
Above-mentioned axial projection 162 stretches in the pushing tow groove 171, according to the rotation pushing tow push rod 17 of rotating shaft 16.And also having determined push rod 17 whether to slide in the different parts pushing tow of pushing tow groove 171, axial projection 162 protrudes from the gabarit 12a of valve actuation cam 12.Centrifugal 18 second drive portion 182 is a projection cube structure, is inserted into second of above-mentioned groove kenel and is driven portion 161 it is stirred.
Position-limit mechanism comprise a limit sliding chutes 183, with a position limit pin 21, limit sliding chutes 183 is arranged with in centrifugal 18, position limit pin 21 passes limit sliding chutes 183 and is fixed on the camshaft actuated part 14, and centrifugal 18 rotation is restricted between the primary importance and the second place.
Fig. 3 is the part broken away view (not containing the camshaft actuated part) after the decompressor assembling.Find out that by knowing among the figure decompressor mainly is to drive two pressure relief mechanism simultaneously by single centrifugal 18, separately decompression portion 152,172 is protruded or do not protrude from the camshaft 10 wide 11a outside the corresponding valve actuation cam 11,12,12a.Decompressor effect and mechanism's running of not doing the time spent below will be described respectively.
With reference to figure 2 and Fig. 4.When engine running, the rotating power of crankshaft (figure does not show) is delivered to camshaft actuated part 14 (sprocket wheel), reaches camshaft 10, and centrifugal 18 also is switched to primary importance because of the pre-power of centrifugal action opposing torsion spring.This moment two drive portions 181 on centrifugal 18,182 portions of being driven 151 that do not drive two pressure relief mechanism, 161, that is first pressure relief mechanism 15 can be driven to rotate and make its first decompression portion, 152 retractions in the first decompression slotted eye 103, does not protrude from the gabarit 11a of valve actuation cam 11; With regard to second pressure relief mechanism, its rotating shaft 16 rotation that is struck earlier, therefore eccentric axial projection 162 that is provided with also produces displacement on it, change the position of pushing tow push rod 17, make the slippage and do not protrude from the gabarit 12a of valve actuation cam 12 in the second decompression slotted eye 104 of the second decompression portion 172 of push rod 17, two pressure relief mechanism all can't be passed corresponding valve (scheming not show).So decompressor just can't be brought into play the decompression function.
With reference to figure 2 and Fig. 5.When engine was lower than specific rotation speeds or shuts down, because camshaft actuated part 14 (sprocket wheel), and camshaft 10 rotating speeds are low or no longer rotate, centrifugal 18 centrifugal action reduced, so can be tried hard to recommend the second place in advance by torsion spring.This moment two drive portions 181 on centrifugal 18,182 with the portions of being driven 151 in contrast to the indivedual driving of above-mentioned direction two pressure relief mechanism, 161, that is first pressure relief mechanism 15 can be driven to rotate and make its first decompression portion 152 protrude from the gabarit 11a of valve actuation cam 11; With regard to second pressure relief mechanism, axial projection 162 produces displacement once more and changes the position of pushing tow push rod 17, make the second decompression portion 172 of push rod 17 protrude from the gabarit 12a surface of valve actuation cam 12, so two pressure relief mechanism all can be passed corresponding valve, decompressor performance decompression function.
Fig. 6 shows that the decompression portion 152,172 of two pressure relief mechanism protrudes in the valve actuation cam gabarit of camshaft 10 respectively, and can find out the situation that its corresponding valve 26 is passed by decompression portion 152.
Among Fig. 2, more can suitably set an equilibrate counterweight (figure do not show) on the camshaft actuated part 14, by this with the mutual balance of amount of unbalance of centrifugal 18 and valve actuation cam.In addition, the diameter of a spring bearing 24 of first axial chamber 101 camshaft that wore is not equal to other spring bearing diameter of camshaft.
The double-action mechanism of projection/groove combination in the previous embodiment, who knows that but it is reciprocity that this skill person should understand its kenel, for example first driven portion 27 and can be changed to a groove kenel, the first corresponding drive portion 28 then can be changed to the projection kenel, second embodiment as shown in Figure 7.
With reference to figure 8, be the utility model the 3rd embodiment.The main characteristic of this example is that two pressure relief mechanism have same configuration, just all adopts the structure of the wheeled pressure relief mechanism of first embodiment's convexity.Similarly, rely on single centrifugal 31 rotation to drive two and driven portion 321,331, make two decompression portions, 322,332 protrusions or do not protrude from the gabarit of valve actuation cam separately.
Claims (9)
1. the engine cylinder head of a tool decompressor is characterized in that comprising:
One camshaft includes at least two valve actuation cams, reaches plural number decompression slotted eye;
One camshaft actuated part is fixed in this camshaft and rotation synchronously;
One centrifugal, be hubbed at this camshaft actuated part, include plural drive portion, this centrifugal can be pivoted between a primary importance and the second place; And
The plural number pressure relief mechanism is located in this camshaft, and each pressure relief mechanism includes one and driven portion, an and decompression portion, and these portions of being driven correspondence respectively are resisted against these drive portions, and these decompression portions correspondence respectively are contained in these decompression slotted eyes;
Wherein, when being positioned at this primary importance for this centrifugal, these drive portions drive these and are driven portion and make these decompression portions not protrude from the gabarit of these valve actuation cams; When being positioned at this second place for this centrifugal, these drive portions drive these and are driven portion and make these decompression portions protrude from the gabarit of these valve actuation cams.
2. engine cylinder head as claimed in claim 1, it is characterized in that this plural number pressure relief mechanism includes at least one cammingly pressure relief mechanism, it includes an axis body portion, this axis body portion one end forms the portion of being driven of this cammingly pressure relief mechanism of eccentric projection kenel, the other end forms this decompression portion with non-circular cross-section, and make this decompression portion selecting type protrude or not protrude from the gabarit of corresponding valve actuation cam according to the rotation of this axis body portion, and the pairing drive portion of the portion of being driven of this cammingly pressure relief mechanism is a groove.
3. engine cylinder head as claimed in claim 1, it is characterized in that this plural number pressure relief mechanism includes a post rod type pressure relief mechanism, it includes a rotating shaft, an and push rod, this rotating shaft one end forms the portion of being driven of this post rod type pressure relief mechanism of groove kenel, this rotating shaft the other end forms an axial projection that is set for the eccentric, be concaved with a pushing tow groove on the anchor ring of this push rod, one end of this push rod forms this decompression portion, this axial projection is arranged in this pushing tow groove and according to this push rod of rotation pushing tow of this rotating shaft, make this decompression portion selecting type protrude or not protrude from the gabarit of corresponding valve actuation cam, the pairing drive portion of the portion of being driven of this post rod type pressure relief mechanism is a projection.
4. engine cylinder head as claimed in claim 2 is characterized in that this plural number pressure relief mechanism comprises two cammingly pressure relief mechanism.
5. engine cylinder head as claimed in claim 1 is characterized in that including a position-limit mechanism, makes this centrifugal to be limited between this primary importance and this second place.
6. engine cylinder head as claimed in claim 5, it is characterized in that this position-limit mechanism comprise a limit sliding chutes, with a position limit pin, this limit sliding chutes is arranged with in this centrifugal, this position limit pin is fixed in this camshaft actuated part and is arranged in this limit sliding chutes.
7. engine cylinder head as claimed in claim 1 is characterized in that including a reset components, and the one end is resisted against this centrifugal, and the other end is resisted against this camshaft actuated part.
8. engine cylinder head as claimed in claim 7 is characterized in that this reset components is a torsion spring.
9. engine cylinder head as claimed in claim 1 is characterized in that this camshaft actuated part is a sprocket wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020701251XU CN201908739U (en) | 2010-12-31 | 2010-12-31 | Engine cylinder head with decompression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020701251XU CN201908739U (en) | 2010-12-31 | 2010-12-31 | Engine cylinder head with decompression device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201908739U true CN201908739U (en) | 2011-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020701251XU Expired - Fee Related CN201908739U (en) | 2010-12-31 | 2010-12-31 | Engine cylinder head with decompression device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201908739U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628944A (en) * | 2013-12-09 | 2014-03-12 | 苏州科瓴精密机械科技有限公司 | Start pressure reducing device of gasoline engine |
| CN104454072A (en) * | 2014-12-10 | 2015-03-25 | 重庆市银钢一通科技有限公司 | Engine and decompressor thereof |
| CN114135359A (en) * | 2021-11-30 | 2022-03-04 | 江门市大长江集团有限公司 | Engine and pressure reducing cam catch structure |
-
2010
- 2010-12-31 CN CN201020701251XU patent/CN201908739U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628944A (en) * | 2013-12-09 | 2014-03-12 | 苏州科瓴精密机械科技有限公司 | Start pressure reducing device of gasoline engine |
| CN103628944B (en) * | 2013-12-09 | 2016-08-17 | 苏州科瓴精密机械科技有限公司 | Petrolic startup decompressor |
| CN104454072A (en) * | 2014-12-10 | 2015-03-25 | 重庆市银钢一通科技有限公司 | Engine and decompressor thereof |
| CN114135359A (en) * | 2021-11-30 | 2022-03-04 | 江门市大长江集团有限公司 | Engine and pressure reducing cam catch structure |
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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: 20110727 Termination date: 20171231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |