PH12014000366A1 - Decompression device of internal combustion engine - Google Patents
Decompression device of internal combustion engine Download PDFInfo
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- PH12014000366A1 PH12014000366A1 PH12014000366A PH12014000366A PH12014000366A1 PH 12014000366 A1 PH12014000366 A1 PH 12014000366A1 PH 12014000366 A PH12014000366 A PH 12014000366A PH 12014000366 A PH12014000366 A PH 12014000366A PH 12014000366 A1 PH12014000366 A1 PH 12014000366A1
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- camshaft
- hole
- section
- decompression device
- decompression
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- 230000006837 decompression Effects 0.000 title claims abstract description 91
- 238000002485 combustion reaction Methods 0.000 title claims description 33
- 230000014759 maintenance of location Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
A decompression device is mounted to a camshaft. The decompression device includes a base disk, a counterweight rocking arm, an elastic element, a decompression camshaft, and an axle. The base disk is mounted to the camshaft and adjacent to an exhaust cam. The counterweight rocking arm includes a channel formed therein. The counterweight rocking arm includes a constraint block that is formed at an end thereof and has an end slidably receivable in a constraint hole of the base disk. The elastic element is connected between the base disk and the counterweight rocking arm. The decompression camshaft is received in a receiving groove of the camshaft and includes a base section and a cam section extending from the base section and having a circular curved face and a flat planar face and including a rotary shaft hole of the exhaust cam.
Description
DECOMPRESSION DEVICE OF INTERNAL COMBUSTION ENGINE
The present invention generally relates to a decompression device of an intemal combustion engine, and more particularly to a decompression device that improves universality of the decompression device of the intemal combustion engine.
As shown in FIG 1, when an intemal combustion engine 1 is just about to start, to prevent an excessively large resistance for a piston 11 arranged inside the engine 1 to move upward from the bottom dead center, a decompression device 14 is ] mounted to a camshaft 13 of a cylinder head 12. ]
The decompression device 14 is arranged beside an exhaust cam 131 of the camshaft 13 so that at the time when the intemal combustion engine 1 is about to start, the decompression device 14 is operable to push away an exhaust rocker am 15, whereby after the exhaust rocker arm 15 is pushed away by the decompression device 14, an exhaust valve (not shown) is caused to open by a small extent of opening. As such, when the intemal combustion engine 1 starts and the piston 11 is moved upward from the bottom dead center to induce an air pressure inside a combustion chamber 16, the air pressure induced by the upward movement of the piston 11 can be released through the small opening of the exhaust valve so as to reduce the resistance against the upward movement of the piston 11 from the bottom dead center and thus facilitating the starting of the internal combustion engine 1.
Although the decompression device 16 arranged at one side of the camshaft 13 helps the intemal combustion engine 1 to reduce the resistance against the upward movement of the piston 11 from the bottom dead center, it is still an issue of the intemal combustion engine industry to ensure the operability of the decompression device 14 and to improve the universality of the decompression device 14 in intemal combustion engines 1 of various engine displacements.
The primary object of the present invention is to provide a decompression device of an intemal combustion engine, which overcomes the issue of insufficiency of universality of the conventional decompression devices for intemal combustion engines.
To achieve the above object, the primary technical solution adopted in the present invention is to provide a decompression device of an intemal combustion engine. The decompression device is mounted to the camshaft. The camshaft comprises an intake cam and an exhaust cam. The camshaft comprises a receiving groove formed in an exhaust cam end thereof. The exhaust cam comprises a shaft hole formed in a side of the receiving groove. The decompression device comprises a base disk, a counterweight rocking am, an elastic element, a decompression camshaft, and an axle. The base disk is mounted to the camshaft and adjacent to the exhaust cam. The base disk comprises an axle hole and a constraint hole formed in a portion thereof opposite to the axle hole and also comprises a through hole and a fitting slot respectively formed in portions thereof between the axle hole and the constraint hole. The counterweight rocking am has an end in which a rotary axle hole is formed. The rotary axle hole comesponds to the axle hole of the base disk. The counterweight rocking arm comprises a retention hole formed therein at a location adjacent to the rotary axle hole. The counterweight rocking arm comprises a channel formed therein. The counterweight rocking arm comprises a constraint block that is formed at an end thereof opposite to the rotary axie hole and projects outwards. An end of the constraint block is slidably receivable in the constraint hole of the base disk. The elastic element has an end attached to the fitting slot of the base disk and an opposite end attached to the retention hole of the counterweight rockingam. The decompression camshaft is received in the receiving groove of the camshaft and extends through the through hole of the base disk. The decompression camshaft comprises a base section. A cam section extends from the base section in a direction toward the exhaust cam. The cam section has a surface forming a circular curved face and an opposite surface forming a flat planar face.
The cam section has an end from which a rotary shaft section extends. The rotary shaft section has an end received in the shaft hole of the exhaust cam. The base section of the decompression camshaft has a surface opposite to the cam section and comprising a push peg section extending therefrom. The push peg section has an end that is slidably received in the channel of the counterweight rocking am. The axie has an end received in the axle hole of the base disk. The axie has an opposite end received in the rotary axle hole of the counterweight rocking am.
The efficacy that the present invention can achieve with the above described technical solution is that the counterweight rocking arm, when driven by a centrifugal force induced by the rotation of the camshaft to oscillate, drives the decompression camshaft to rotate in the receiving groove of the camshaft and to be applicable to an intemal combustion engine of a different engine displacement, the decompression device is directly usable by simply changing the location of the receiving groove in a radial direction of the camshaft so that there is no need to make a new design of the decompression device and the universality of the decompression device is enhanced to thereby improve the effectiveness of use of the decompression device.
The foregoing objectives and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. ‘
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
FIG. 1 is a perspective view showing a conventional decompression device of anintemal combustion engine.
FIG 2 is a schematic view showing a decompression device of an intemal combustion engine according to the present invention.
FIG 3 is an exploded view showing the decompression device of the intemal combustion engine according to the present invention.
FIG. 4 is a perspective view showing the decompression device according to the present invention in an assembled condition.
FIG § is a schematic view showing the decompression device of the internal combustion engine according to the present invention in a decompression condition.
FIG 6 is a schematic view showing the decompression device of the intemal combustion engine according to the present invention in a non-decompression condition.
The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way.
Rather, the following description provides a convenient illustration for implementing J exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
Referring first to FIGS. 2 and 3, the present invention provides a decompression device of an intemal combustion engine. The decompression device 2 is mounted to a camshaft 3 and is adjacent to an exhaust cam 31 of the camshaft 3.
The decompression device 2 comprises a base disk 21, a counterweight rocking am 22, an elastic element 23, a decompression camshaft 24, and an axie 25.
The base disk 21 is integrally formed with the camshaft 3, or can altematively be a separate component that is mounted to the camshaft 3 through interference fitting, in such a way that the base disk 21 is adjacent to the exhaust cam 31. More specifically, the base disk 21 is mounted at a location that is distant from an intake cam 32 and beside the exhaust cam 31. In other words, the intake cam 32, the exhaust cam 31, and the base disk 21 are arranged on the camshaft 3 in such an order. The base disk 21 comprises, formed therein, an axle hole 211, an elongate curved constraint hole 212 that is formed at a portion opposite to the axle hole 211, and a through hole 213 and a fitting slot 214 that has an outward-facing opening respectively formed in portions between the axle hole 211 and the constraint hole 212. It is noted that in case that the base disk 21 is formed as a separate component mounted to the camshaft 3 through interference fitting, the through hole 213 is composed of a cutoff 21a formed by partly recessing the base disk 21 and a receiving groove 33 formed by partly recessing the camshaft 3.
The counterweight rocking am 22 comprises a curved body. The counterweight rocking arm 22 has one end in which a rotary axle hole 221 is formed in such a way that the rotary axle hole 221 corresponds to the axle hole 211 of the base disk 21. The counterweight rocking am 22 comprises a retention hole 222 formed therein at a location adjacent to the rotary axle hole 221 and the counterweight rocking am 22 also comprises, at an end thereof opposite to the retention hole 222, a channel 223 formed in a surface thereof that faces the base disk 21 and having an opening facing outward. The channel 223 is delimited by two substantially parallel surfaces. An extension section 224 extends from an outside of the channel 223 and the extension section 224 has an end from which a constraint block 225 projects sideways. In other words, the counterweight rocking am 22 comprises an outward-projecting constraint block 225 formed in an end thereof that is opposite to the rotary axle hole 221.
The elastic element 23 has an end attached to the fitting slot 214 of the base disk 21. The elastic element 23 has an opposite end that is attached to the retention hole 222 of the counterweight rocking am 22.
The decompression camshaft 24 comprises a base section 241. The decompression camshaft 24 also comprises a cam section 242 extending from the base section 241 in a direction toward the exhaust cam 31. The cam section 242 has a surface that forms a circular curved face 2421 and an opposite surface that forms a flat planar face 2422. The cam section 242 comprises a rotary shaft section 243 extending from an end thereof. The base section 241 of the decompression camshaft 24 comprises a push peg section 244 extending from a surface that is opposite to the cam section 242.
The axie 25 has an end received in the axie hole 211 of the base disk 21.
The axle 25 has an opposite end received in the rotary axle hole 221 of the counterweight rocking arm 22.
Referring to FIGS. 2, 3, and 4, assembly of the decompression device 2 of the present invention is carried out as follows. A receiving groove 33, which has an upperend that is open, is formed in the camshaft 3 at one side of the exhaust cam 31.
A shaft hole 311 is formed in the end of the camshaft 3 that is distant from the intake cam 32 is also formed in the portion of the exhaust cam 31 in which the receiving groove 33 is formed. The base disk 21 of the decompression device 2 is mounted to the camshaft 3 at a location adjacent to the exhaust cam 31. The decompression camshaft 24 of the decompression device 2 is inserted into the through hole 213 in such a way that the rotary shaft section 243 of the decompression camshaft 24 is received in the shaft hole 311 of the camshaft 3. And, then, an end of the axle 25 is inserted into the axle hole 211 of the base disk 21. Finally, the counterweight rocking am 22 is fit to the axle 25 with the rotary axle hole 221 thereof in such a way that the constraint block 225 of the counterweight rocking arm 22 is slidably received in the constraint hole 212 of the base disk 21 and an end of the elastic element 23 is attached to the fitting slot 214 of the base disk 21 and an opposite end of the elastic element 23 is attached to the retention hole 222 of the counterweight rocking arm 22.
Meanwhile, the push peg section 244 of the decompression camshaft 24 is slidably positioned in the channel 223 of the counterweight rocking am 22. As such, the counterweight rocking am 22 is allow to oscillate about an oscillation center defined by the axle 25 and the decompression camshaft 24 is driven by the counterweight rocking am 22 to rotate in the receiving groove 33, about a center defined by the rotary shaft section 243 for an angular range of around 90 degrees. Also, the circular curved face 2421 of the cam section 242 of the decompression camshaft 24 is allowed to partly project outside the receiving groove 33 of the camshaft 3 to be slightly beyond a basic circle of the exhaust cam 31. As such, the assembly of the decompression device 2 is completed.
For the operation of the decompression device 2 according to the present invention, as shown in FIGS. 2 and 5, at the moment when the internal combustion engine A is not started, since the circular curved face 2421 of the cam section 242 of the decompression camshaft 24 of the decompression device 2 is partly projecting beyond the basic circle of the exhaust cam 31, it pushes away an exhaust rocker am (not shown in the drawings) to set an exhaust valve is a condition of being slightly opened.
As shown in FIGS. 2, 3, and 6, at the moment when the intemal combustion engine A is just started, the counterweight rocking am 22 of the decompression device 2 is driven by a centrifugal force generated by the rotation of the camshaft 3 to oscillate about the oscillation center defined by the axle 25, whereby when the counterweight rocking arm 22 oscillates, the counterweight rocking am 22 forces the push peg section 244 of the decompression camshaft 24 to move with the channel 223 so as to make the decompression camshaft 24 rotating in the receiving groove 33 of the camshaft 3 about a rotation center defined by the rotary shaft section
243. In other words, the circular curved face 2421 of the cam section 242 of the decompression camshaft 24 is rotated to move into the receiving groove 33, while the flat planar face 2422 of the cam section 242 of the decompression camshaft 24 is rotated to move out of the receiving groove 33, whereby the cam section 242 of the decompression camshaft 24 no longer projects beyond the basic circle of the exhaust cam 31 and thus, the decompression camshaft 24 no longer pushes the exhaust rocker arm away.
Since the constraint block 225 of the counterweight rocking am
22 is received in the constraint hole 212 of the base disk 21, the interaction between the constraint block 225 of the counterweight rocking acm 22 and the constraint hole 212 of the base disk 21 provides a limitation to the angular range of the rotation of the decompression camshaft 24.
An effect of the present invention is that the counterweight rocking am 22 has an end in which a rotary axle hole 221 is formed in such a way that the rotary axle hole 221 corresponds to an axle hole 211 of the base disk 21; the counterweight rocking am 22 comprises a retention hole 222 formed therein at a location adjacent to the rotary axle hole 221 and a channel 223 is formed in an end of the counterweight rocking am 22 that is opposite to the retention hole 222 and has an opening facing outward; the counterweight rocking am 22 comprises a constraint block 225 formed in the end thereof that is opposite to the rotary axie hole 221 and projecting outward in such a way that the constraint block 225 is received in the constraint hole 212 of the base disk 21; the decompression camshaft 24 comprises a base section 241 and the decompression camshaft 24 comprises a cam section 242 extending from the base section 241 in a direction toward the exhaust cam 31 and having a diameter less than that of the base section 241; the cam section 242 has a surface forming a circular curved face 2421 and an opposite surface forming a flat planar face 2422; the cam section 242 has an end that from which a rotary shaft section 243 extends; and the base section 241 of the decompression camshaft 24 comprises a push peg section 244 extending therefrom to be opposite to the cam section 242 in such a way that the push peg section 244 is insertable into the channel 223 of the counterweight rocking am 22. As such, the counterweight rocking am 22, when driven by a centrifugal force induced by the rotation of the camshaft 3 to oscillate, drives the decompression camshaft 24 to rotate in the receiving groove 33 of the camshaft 3, so that to be applicable to an internal combustion engine A of a different engine displacement (namely having a camshaft 3 having a different outside diameter), the decompression device 2 is directly usable by simply changing the location of the receiving groove 33 in a radial direction of the camshaft 3 whereby there is no need to make a new design of the decompression device 2 and the universality of the decompression device 2 is enhanced to thereby improve the effectiveness of use of the decompression device 2.
Another effect of the present invention is that with the arrangement of the cam section 242 of the decompression camshaft 24, the rotary shaft section 243 and the push peg section 244 can be arranged axially so as to effectively reduce the size of the decompression device 2 in a radial direction.
A further effect of the present invention is that with the arrangement that the constraint block 225 of the counterweight rocking atm 22 is received in the constraint hole 212 of the base disk 21, the maximum range of oscillation of the counterweight rocking arm 22 can be determined so that through interaction between the constraint block 225 of the counterweight rocking arm 22 and the constraint hole 212 of the base disk 21, the angular range of rotation of the decompression camshaft 24 is limited by which, on the one hand, the weight of the base disk 21 can be reduced and, on the other hand, breaking of the push peg section 244 of the decompression camshaft 24 can be prevented.
Yet a further effect of the present invention is that with the arrangement that the counterweight rocking am 22 comprises a curved body and the counterweight rocking arm 22 comprises an extension section 224 that extends from the outside of the channel 22 with a constraint block 225 projecting sideways from an end of the extension section 224, the moment of inertia and the operability of the counterweight rocking arm 22 are improved.
Yet a further effect of the present invention is that with the amangement that the channel 223 is delimited by two substantially parallel surfaces, the machining of the channel 223 is eased.
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the f present invention.
Claims (8)
1. A decompression device of an intemal combustion engine, the decompression device being mounted to a camshaft, the camshaft comprising an intake cam and an exhaust cam, the camshaft comprising a receiving groove formed in an exhaust cam end thereof, the exhaust cam comprising a shaft hole formed in a side of the receiving groove; the decompression device comprising a base disk, a counterweight rocking arm, an elastic element, a decompression camshaft, and an axle; the base disk being mounted to the camshaft and adjacent to the exhaust cam, the base disk comprising an axle hole and a constraint hole formed in a portion thereof opposite to the axle hole and also comprising a through hole and a fitting slot respectively formed in portions thereof between the axle hole and the constraint hole; the counterweight rocking am having an end in which a rotary axle hole is formed, the rotary axle hole corresponding to the axle hole of the base disk, the counterweight rocking arm comprising a retention hole formed therein at a location adjacent to the rotary axle hole, the counterweight rocking arm comprising a channel formed therein, the counterweight rocking arm comprising a constraint block that is formed at an end thereof opposite to the rotary axle hole and projects outwards, an end of the constraint block being slidably receivable in the constraint hole of the base disk;
the elastic element having an end attached to the fitting slot of the base disk and an opposite end attached to the retention hole of the counterweight rocking am; the decompression camshaft being received in the receiving groove of the camshaft and extending through the through hole of the base disk, the decompression camshaft comprising a base section, a cam section extending from the base section in a direction toward the exhaust cam, the cam section having a surface forming a circular curved face and an opposite surface forming a flat planar face, the cam section having an end from which a rotary shaft section extends, the rotary shaft section having an end received in the shaft hole of the exhaust cam, the base section of the decompression camshaft having a surface opposite to the cam section and comprising a push peg section extending therefrom, the push peg section having an end that is slidably received in the channel of the counterweight rocking am; the axle having an end received in the axle hole of the base disk, the axie having an opposite end received in the rotary axle hole of the counterweight rocking am.
2. The decompression device of the internal combustion engine according to claim 1, wherein the base disk is a separate member that is mounted to the camshaft through interference fitting and the through hole is composed of a cutoff formed by partly recessing the base disk and a receiving groove formed by partly recessing the camshaft.
3. The decompression device of the internal combustion engine according to claim 1, wherein the channel of the counterweight rocking am is delimited by substantially parallel surfaces and the channel has an opening facing outward.
4. The decompression device of the internal combustion engine according to claim 1, wherein the counterweight rocking arm comprises an extension section extending from outside of the channel, the extension section having an end from which the constraint block projects sideways.
5. The decompression device of the intemal combustion engine according to claim 3, wherein the counterweight rocking arm comprises an extension section extending from outside of the channel, the extension section having an end from which the constraint block projects sideways.
6. The decompression device of the internal combustion engine according to claim 1, wherein the constraint hole is an elongate curved hole.
7. The decompression device of the intemal combustion engine according to claim 1, wherein the channel is formed in an end of the counterweight rocking arm that is opposite to the retention hole.
8. The decompression device of the intemal combustion engine according to claim 1, wherein the base disk is integrally formed with the camshaft.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103103342A TWI575151B (en) | 2014-01-29 | 2014-01-29 | Decompression device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PH12014000366A1 true PH12014000366A1 (en) | 2016-06-13 |
Family
ID=54342600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PH12014000366A PH12014000366A1 (en) | 2014-01-29 | 2014-12-04 | Decompression device of internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| PH (1) | PH12014000366A1 (en) |
| TW (1) | TWI575151B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6834196B2 (en) * | 2016-07-05 | 2021-02-24 | スズキ株式会社 | Variable valve mechanism, engine and motorcycle |
| TWI655360B (en) * | 2017-06-29 | 2019-04-01 | 三陽工業股份有限公司 | Engine with decompression device |
| TWM580123U (en) * | 2018-11-30 | 2019-07-01 | 光陽工業股份有限公司 | Decompression device of internal combustion engine |
| IT201900016283A1 (en) * | 2019-09-13 | 2021-03-13 | Piaggio & C Spa | COMBUSTION ENGINE WITH DEVICE FOR CHANGING THE PHASE OF THE VALVES OF A CAMSHAFT |
| 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 |
| TWI816430B (en) * | 2022-06-09 | 2023-09-21 | 光陽工業股份有限公司 | Limiting structure of internal combustion engine pressure reducing device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4180447B2 (en) * | 2003-06-04 | 2008-11-12 | 本田技研工業株式会社 | Decompression device for internal combustion engine |
| CN100538023C (en) * | 2006-01-20 | 2009-09-09 | 本田技研工业株式会社 | The decompressor of internal-combustion engine |
| WO2007083386A1 (en) * | 2006-01-20 | 2007-07-26 | Honda Motor Co., Ltd. | Decompression device for internal combustion engine |
| JP4540655B2 (en) * | 2006-11-24 | 2010-09-08 | 本田技研工業株式会社 | Internal combustion engine with decompression device |
| TW200942686A (en) * | 2008-04-03 | 2009-10-16 | Sanyang Industry Co Ltd | A pressure-reducing device for engine |
| TWI451031B (en) * | 2010-05-12 | 2014-09-01 | Sanyang Industry Co Ltd | Engine decompression mechanism |
| TWM418968U (en) * | 2011-06-22 | 2011-12-21 | Sanyang Industry Co Ltd | Pressure-reducing device of engine |
-
2014
- 2014-01-29 TW TW103103342A patent/TWI575151B/en not_active IP Right Cessation
- 2014-12-04 PH PH12014000366A patent/PH12014000366A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TWI575151B (en) | 2017-03-21 |
| TW201529957A (en) | 2015-08-01 |
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