CN101806233A - Camshaft pressure reducing mechanism of internal-combustion engine - Google Patents
Camshaft pressure reducing mechanism of internal-combustion engine Download PDFInfo
- Publication number
- CN101806233A CN101806233A CN201010171800A CN201010171800A CN101806233A CN 101806233 A CN101806233 A CN 101806233A CN 201010171800 A CN201010171800 A CN 201010171800A CN 201010171800 A CN201010171800 A CN 201010171800A CN 101806233 A CN101806233 A CN 101806233A
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- CN
- China
- Prior art keywords
- camshaft
- decompressor
- pressure reducing
- exhaust cam
- gear
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
- F01L13/085—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio the valve-gear having an auxiliary cam protruding from the main cam profile
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention relates to a camshaft pressure reducing mechanism of an internal-combustion engine, which comprises a camshaft and an admission cam, an exhaust cam and a gear which are arranged on the camshaft. The pressure reducing mechanism is characterized in that a shaft section of the camshaft, positioned between the gear and the exhaust cam, is provided with a tangential plane; the shaft section is provided with a transverse pin hole; the base circle of the exhaust cam, close to a stop end, is provided with a notch; the tangential plane of the camshaft is connected with the notch of the exhaust cam; a U-shaped pressure reducing device is hinged on the camshaft through a pin shaft; the upper end of the pressure reducing device is provided with a transverse extended pressure reducing limit part; the pressure reducing limit part is provided with a flange; the distance between the vertex of the flange and the center of the camshaft is greater than the radius of the base circle of the exhaust cam close to a stop end; the lower end parts of two support arms of the pressure reducing device are provided with weight blocks; and a return torsion spring is sleeved on the pin shaft, one end of the return torsion spring is positioned at one end of the weight block of the pressure reducing device, and the other end of the return torsion spring is positioned on the gear. The pressure reducing mechanism has the advantages of simple structure and reliable work, and is suitable for a small-sized universal internal-combustion engine.
Description
Technical field
The present invention relates to the Small Universal internal-combustion engine, be specifically related to a kind of camshaft pressure reducing mechanism of internal-combustion engine.
Background technique
During the internal combustion engine start of Small Universal machine, needing to suck new gas compresses, near the compression terminal point, can produce very big resistance to compression pression, if do not reduce pressure this moment, starting force is increased, starting is difficulty very, therefore need to adopt the mechanism of decompressor to reduce pressure, to guarantee that internal-combustion engine starts smoothly.Then require the mechanism of decompressor to shed pressure-reducing function automatically behind the internal combustion engine start, so that the internal-combustion engine proper functioning.
Usually, the mechanism of decompressor is provided with on the camshaft, and the mechanism of decompressor gets rid of piece, axle, return spring and decompression ejector pin by decompression to be formed, and to get rid of piece be two independent parts to the decompression ejector pin with decompression, between connect by pin-chute.For ease of the installation of return spring, must get rid of perforate on the piece in decompression, perforate or mount pin on gear.Complex structure.
Summary of the invention
Purpose of the present invention provides a kind of camshaft decompression mechanism, this mechanism of decompressor simple in structure, and reliable operation is suitable for the Small Universal internal-combustion engine.
The object of the present invention is achieved like this: camshaft pressure reducing mechanism of internal-combustion engine, comprise camshaft, camshaft is provided with into, exhaust cam and gear, camshaft has a tangent plane on the shaft part between gear and the exhaust cam, this shaft part has the pin-and-hole of cross setting, the basic circle that exhaust cam closely stops Cheng Duan is provided with breach, the camshaft tangent plane is connected with the breach of exhaust cam, the decompressor of U type is hinged on the camshaft by bearing pin, the decompressor upper end has the decompression limited part of horizontal expansion, has flange on the decompression limited part, the summit of flange is to the distance at the camshaft center radius greater than the basic circle that closely stops Cheng Duan of exhaust cam, and two support arm underparts of decompressor are provided with balancing weight; One return torsion spring set is on bearing pin, and an end of return torsion spring is positioned at balancing weight one end of decompressor, and the other end is positioned on the gear.
Two support arms of described decompressor are provided with pin-and-hole, and it is hinged with decompressor and camshaft that bearing pin passes pin-and-hole.
The position of corresponding configuration block is provided with the hole that the balancing weight that is used to decompressor is stepped down on the described gear.
Be provided with between described camshaft tangent plane and the gear and be used for spacing step.
Owing to adopt technique scheme, on camshaft, connect decompressor by bearing pin, decompressor is provided with a flange, and the Base radius of the distance at camshaft center greater than exhaust cam arrived on the summit of flange.When camshaft stops or with than the slow-speed of revolution campaign time, decompressor makes decompressor be close to exhaust cam under the effect of return torsion spring, flange jack-up tappet is opened valve, makes that pressure is reduced in the cylinder, and internal-combustion engine can start easily smoothly.When camshaft moves with high rotational speed, under action of centrifugal force, balancing weight drives flange away from exhaust cam, and flange leaves the tappet below, and tappet can be moved down on the exhaust cam, cancellation decompression restriction, motor proper functioning.This mechanism of decompressor simple in structure, reliable operation is suitable for the Small Universal internal-combustion engine.
Described gear is provided with the hole that the balancing weight that is used to decompressor is stepped down, and to avoid balancing weight, makes decompressor oppositely centrifugal, and the mechanism of decompressor loses decompression, the internal-combustion engine proper functioning.
Have between described camshaft tangent plane and the gear and be used for the centrifugal spacing step of decompressor, decompression limited part one side contacts of step and decompressor, restriction decompressor centrifugal motion is excessive, avoids causing decompressor and gear to interfere.
Description of drawings
Fig. 1 is a mechanism of decompressor working state schematic representation of the present invention;
Fig. 2 is the right elevation of the mechanism of decompressor of the present invention;
Fig. 3 is the schematic representation of decompressor;
Fig. 4 is that the A-A of Fig. 1 is to sectional view;
Fig. 5 is the idle schematic representation of the mechanism of decompressor;
Fig. 6 is Fig. 1 partial schematic diagram.
In the accompanying drawing, 1 is decompressor, and 2 is bearing pin, and 3 is camshaft, and 4 is the return torsion spring, and 5 is exhaust cam, and 6 is tappet, and 7 is balancing weight, and 8 is flange, 9 gears, and 10 is step, and 11 is the hole, and 12 are the decompression limited part, and 13,15 is pin-and-hole, 14 is breach, H
1Be the summit of flange distance, H to the camshaft center
2Radius for the basic circle that closely stops Cheng Duan of exhaust cam.
Embodiment
Referring to figs. 1 through Fig. 6, camshaft pressure reducing mechanism of internal-combustion engine, comprise that camshaft 3, camshaft 3 are provided with intake cam (not marking out among the figure) and exhaust cam 5 and gear 9, exhaust cam 5 is corresponding with the tappet 6 of distribution device, when internal-combustion engine quit work, tappet 6 was corresponding with the basic circle that closely stops Cheng Duan of exhaust cam 5.Camshaft 3 has a tangent plane on the shaft part between gear and the exhaust cam, this shaft part has the pin-and-hole 15 of cross setting, the basic circle that exhaust cam closely stops Cheng Duan is provided with breach 14, the camshaft tangent plane is connected with the breach 14 of exhaust cam, be provided with between camshaft tangent plane and the gear and be used for spacing step 10, step 10 next-door neighbour's gears 9, step 10 is used for the spacing of decompressor centrifugal motion, the excessive and gear tooth interference of the centrifugal skew of restriction decompressor 1.The decompressor 1 of U type is hinged on the camshaft 3 by bearing pin 2, and decompressor 1 is a U type frame structure, and 1 pair of camshaft of decompressor 3 forms semi-surrounding.Decompressor 1 upper end has the decompression limited part 12 of horizontal expansion, has flange 8 on the decompression limited part 12, and flange adopts impact briquetting, and the summit of flange 8 is to the distance H at camshaft center
1Radius H greater than the basic circle that closely stops Cheng Duan of exhaust cam 5
2, decompression limited part 12 and flange 8 are movable to be supported between camshaft 3 and the tappet 6 to tappet 6 times, and exhaust valve can not cut out fully.Two support arms of decompressor 1 are provided with pin-and-hole 13, and it is hinged with decompressor 1 and camshaft 3 that bearing pin 2 passes pin-and-hole 13.Two support arm underparts of decompressor 1 are provided with balancing weight 7, and balancing weight 7 is one-body molded with support arm, and balancing weight 7 can swing decompressor.One return torsion spring 4 is enclosed within on the bearing pin 2, and an end of return torsion spring 4 is positioned at balancing weight one end of decompressor 1, and the other end of return torsion spring 4 is against on the axial end of gear 9 and locatees, and forms precompression.The position of corresponding configuration block is provided with the hole 11 that the balancing weight that is used to decompressor is stepped down on the described gear 9.Under the twisting force of return torsion spring 4, when decompressor 1 remained static, the balancing weight 7 of decompressor 1 put in the hole 11 on the gear 9.
Referring to Fig. 5 and Fig. 2, behind the internal combustion engine start, camshaft 3 rotates, decompressor 1 rotates with camshaft, the balancing weight 7 of decompressor 1 produces centrifugal force simultaneously, and overcome the active force of return torsion spring 4, make the eccentric position shifting movement and withdraw from hole 11 on the gear 9, the decompression limited part 12 that drives decompressor 1 is thus made rightabout displacement movement, releasing allows tappet 6 contact with the profile of exhaust cam 5, under the driving of exhaust cam to the restriction of tappet 6, the drive exhaust valve finishes normally and opens, cuts out work, makes the motor proper functioning.During this period, the decompression limited part 12 of decompressor 1 contacts with step 10 circumferential surfacies of camshaft 3, the over-travel of restriction decompressor 1.When motor quits work, decompressor stops centrifugal motion, and under the effect of return torsion spring 4 return, decompression limited part 12 and flange 8 are supported between camshaft 3 and the tappet 6 once more, make exhaust valve be in incomplete closed condition and form decompression, for ato unit is once more prepared.
Claims (4)
1. camshaft pressure reducing mechanism of internal-combustion engine, comprise camshaft, camshaft is provided with into, exhaust cam and gear, it is characterized in that: camshaft has a tangent plane on the shaft part between gear and the exhaust cam, this shaft part has the pin-and-hole of cross setting, the basic circle that exhaust cam closely stops Cheng Duan is provided with breach, the camshaft tangent plane is connected with the breach of exhaust cam, the decompressor of U type is hinged on the camshaft by bearing pin, the decompressor upper end has the decompression limited part of horizontal expansion, has flange on the decompression limited part, the summit of flange is to the distance at the camshaft center radius greater than the basic circle that closely stops Cheng Duan of exhaust cam, and two support arm underparts of decompressor are provided with balancing weight; One return torsion spring set is on bearing pin, and an end of return torsion spring is positioned at balancing weight one end of decompressor, and the other end is positioned on the gear.
2. camshaft pressure reducing mechanism of internal-combustion engine according to claim 1 is characterized in that: two support arms of described decompressor are provided with pin-and-hole, and it is hinged with decompressor and camshaft that bearing pin passes pin-and-hole.
3. camshaft pressure reducing mechanism of internal-combustion engine according to claim 1 is characterized in that: the position of corresponding configuration block is provided with the hole that the balancing weight that is used to decompressor is stepped down on the described gear.
4. camshaft pressure reducing mechanism of internal-combustion engine according to claim 1 is characterized in that: be provided with between described camshaft tangent plane and the gear and be used for spacing step.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010171800A CN101806233A (en) | 2010-05-14 | 2010-05-14 | Camshaft pressure reducing mechanism of internal-combustion engine |
| PCT/CN2011/074064 WO2011141003A1 (en) | 2010-05-14 | 2011-05-13 | Camshaft decompression mechanism of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010171800A CN101806233A (en) | 2010-05-14 | 2010-05-14 | Camshaft pressure reducing mechanism of internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101806233A true CN101806233A (en) | 2010-08-18 |
Family
ID=42608165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010171800A Pending CN101806233A (en) | 2010-05-14 | 2010-05-14 | Camshaft pressure reducing mechanism of internal-combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101806233A (en) |
| WO (1) | WO2011141003A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011141003A1 (en) * | 2010-05-14 | 2011-11-17 | 隆鑫通用动力股份有限公司 | Camshaft decompression mechanism of internal combustion engine |
| CN105569761A (en) * | 2016-02-29 | 2016-05-11 | 重庆高金实业有限公司 | Engine start pressure-reducing valve mechanism |
| CN109630226A (en) * | 2019-01-30 | 2019-04-16 | 福州普索工程技术有限公司 | A kind of camshaft |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669129B (en) * | 2021-09-10 | 2022-10-04 | 五羊—本田摩托（广州）有限公司 | Engine pressure reducing device and engine thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5904124A (en) * | 1997-05-08 | 1999-05-18 | Briggs & Stratton Corporation | Enrichment apparatus for internal combustion engines |
| CN2572009Y (en) * | 2002-09-26 | 2003-09-10 | 重庆宗申技术开发研究有限公司 | Automatic pressure reducing device for gasoline engine |
| CN2821169Y (en) * | 2005-06-15 | 2006-09-27 | 重庆市祥陵汽车配件有限公司 | General gasoline engine start pressure unloading device |
| CN2861496Y (en) * | 2005-08-05 | 2007-01-24 | 重庆宗申技术开发研究有限公司 | Shaft for internal combustion engine with mechanism of reduced-pressure decompressor |
| CN201250676Y (en) * | 2008-09-08 | 2009-06-03 | 重庆凯驰汽车部件制造有限公司 | Engine camshaft decompressing mechanism |
| CN201751542U (en) * | 2010-05-14 | 2011-02-23 | 隆鑫通用动力股份有限公司 | Pressure reducing mechanism of camshaft of internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806233A (en) * | 2010-05-14 | 2010-08-18 | 隆鑫工业有限公司 | Camshaft pressure reducing mechanism of internal-combustion engine |
-
2010
- 2010-05-14 CN CN201010171800A patent/CN101806233A/en active Pending
-
2011
- 2011-05-13 WO PCT/CN2011/074064 patent/WO2011141003A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5904124A (en) * | 1997-05-08 | 1999-05-18 | Briggs & Stratton Corporation | Enrichment apparatus for internal combustion engines |
| CN2572009Y (en) * | 2002-09-26 | 2003-09-10 | 重庆宗申技术开发研究有限公司 | Automatic pressure reducing device for gasoline engine |
| CN2821169Y (en) * | 2005-06-15 | 2006-09-27 | 重庆市祥陵汽车配件有限公司 | General gasoline engine start pressure unloading device |
| CN2861496Y (en) * | 2005-08-05 | 2007-01-24 | 重庆宗申技术开发研究有限公司 | Shaft for internal combustion engine with mechanism of reduced-pressure decompressor |
| CN201250676Y (en) * | 2008-09-08 | 2009-06-03 | 重庆凯驰汽车部件制造有限公司 | Engine camshaft decompressing mechanism |
| CN201751542U (en) * | 2010-05-14 | 2011-02-23 | 隆鑫通用动力股份有限公司 | Pressure reducing mechanism of camshaft of internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011141003A1 (en) * | 2010-05-14 | 2011-11-17 | 隆鑫通用动力股份有限公司 | Camshaft decompression mechanism of internal combustion engine |
| CN105569761A (en) * | 2016-02-29 | 2016-05-11 | 重庆高金实业有限公司 | Engine start pressure-reducing valve mechanism |
| CN109630226A (en) * | 2019-01-30 | 2019-04-16 | 福州普索工程技术有限公司 | A kind of camshaft |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011141003A1 (en) | 2011-11-17 |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100818 |