CN102226417A - Engine camshaft assembly and motorcycle - Google Patents
Engine camshaft assembly and motorcycle Download PDFInfo
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- CN102226417A CN102226417A CN 201110135466 CN201110135466A CN102226417A CN 102226417 A CN102226417 A CN 102226417A CN 201110135466 CN201110135466 CN 201110135466 CN 201110135466 A CN201110135466 A CN 201110135466A CN 102226417 A CN102226417 A CN 102226417A
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- valve body
- camshaft
- reducing valve
- pressure relief
- assembly
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Abstract
The invention relates to an engine camshaft assembly and a motorcycle. The assembly comprises a camshaft and a pressure relief assembly; a timing component and the pressure relief assembly are respectively positioned at two ends of the camshaft; the pressure relief assembly comprises a pressure relief valve body, a centrifugal block and a fastening bolt. The engine camshaft assembly provided by the invention has the following advantages: the pressure relief valve body is pressed tightly and fixed through a bolt, a compression base plate, a flange on the pressure relief valve body and a shaft shoulder on the camshaft, the compression contact area of the flange can be increased, the reliability of fastening is ensured, the axial degree of freedom of the pressure relief valve body is restricted, and simultaneously the circumferential degree of freedom of the pressure relief valve body also can be limited to a certain extent; by virtue of the circumferential direction limit structure of the pressure relief valve body, the operation reliability of the pressure relief assembly is ensured; the mounting structure has high integration, the positioning effect is also good, and the mounting errors can be avoided better; and simultaneously the pressure relief valve body can bear, transmit and counteract the rotary inertia force and impact loading generated by the high-speed rotation of an engine, the fatigue and crack phenomena do not occur, and the service life is ensured.
Description
Technical field
The present invention relates to a kind of engine accessory parts that are used for, particularly a kind of camshaft parts and motorcycle thereof that is used for the switch motor valve.
Background technique
The engine cam axle assembly is the part of distribution device outbalance, comprises camshaft and the intake and exhaust cam, timing parts and the reduction valve assembly that are arranged on the camshaft.The reduction valve assembly mainly is to be used for reducing the engine cylinder internal pressure when starting, and reduces and starts external force, avoids occurring the too high or manually-operable handle of the load of starting electrical machinery and phenomenon occurs rebounding strongly.
The centrifugal block structure of the general employing of the reduction valve assembly of widespread usage, centrifugal is provided with in the mode that can move along the camshaft radial plane, when motor does not start, make exhaust valve have suitable aperture, thereby when starting, reduce in-cylinder pressure with the centrifugal fast decompression valve rod that is connected; After starting, the camshaft high speed rotating, centrifugal produces centrifugal motion, drives the decompression valve rod and rotates, and decompression valve rod respective face sinks to camshaft, guarantees the sealing of exhaust valve.Thereby the low pressure when realizing starting.
In the prior art, be respectively in the camshaft assembly structure at camshaft two ends for reduction valve and timing parts, must be provided with coaxial and at the reducing valve body of circumferencial direction secure fit with camshaft, the installation of reducing valve body then is a technical barrier, owing to only need to guarantee the reliability of its circular movement, and guarantee centrifugal flexibility; The general jump ring that adopts is arranged at camshaft with the mode of its axial limiting.And this structure has produced bigger rotating inertia force and impulsive load under high engine speeds rotation or rotating speed change over condition, thereby causes the decompression body of laws fatigue fracture to occur, increases frequency of maintenance.
Therefore, need improve, make reducing valve body can bear rotating inertia force and impulsive load that the high engine speeds rotation produces, the fatigue fracture phenomenon not occur, guarantee its working life, save user cost existing engine cam axle assembly.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of engine cam axle assembly and motorcycle thereof, camshaft assembly makes reducing valve body can bear rotating inertia force and impulsive load that the high engine speeds rotation produces, the fatigue fracture phenomenon do not occur, guarantee its working life, save user cost.
Engine cam axle assembly of the present invention, comprise camshaft and reduction valve assembly, described camshaft is provided with the timing parts, intake cam and exhaust cam, described timing parts and reduction valve assembly lay respectively at the two ends of camshaft, described reduction valve assembly comprises reducing valve body, centrifugal and clamping bolt, described camshaft is provided with the shaft shoulder that reducing valve body is spacing, described reducing valve body is provided with center hole and is coated at camshaft by center hole, described reducing valve body center hole edge outwards is provided with axial ledge vertically, and described hold-down bolt compresses backing plate by one and presses in the axial ledge end face of reducing valve body and make reducing valve body be close proximity to the shaft shoulder; Described centrifugal is at the semicircular structure that compresses between backing plate and the reducing valve body, and an end be articulated in reducing valve body in the mode that can rotate along the camshaft radial plane, and the other end is connected in the decompression valve rod that passes reducing valve body vertically by a connecting pin.
Further, described decompression valve rod is sunken in the valve rod groove that the camshaft surface is provided with vertically and extends to the camming surface that exhaust cam is used to make exhaust valve closing vertically, described decompression valve rod radially protrudes in this camming surface along camshaft, and described decompression valve rod is provided with the depression that is lower than or flushes in this camming surface when it goes to the phase place corresponding with this camming surface; Adopt hinging structure centrifugal, rubbing surface is little, motion flexibly, safety action sensitive reliable.
Further, adopt flanged structure, can guarantee that not only centrifugal has comparatively abundant exercise space, can also guarantee the integrity and the compactedness of reducing valve body, further improve the load ability of reducing valve body, strengthen the ability that the body antifatigue is impacted, prolong its working life.
Further, described centrifugal is provided with and makes it be back to the return spring of position of rest; Utilize the spring return, sensitive reliable.
Further, fixedly install the limiting stopper that is useful on centrifugal return position of restriction on the described reducing valve body; Guarantee that valve body is not impacted by centrifugal return, further improve the working life of reducing valve body.
Further, described clamping bolt is one and cooperates with the camshaft coaxial threaded and to screw in the camshaft end face, presses axial ledge end face in reducing valve body with compressing backing plate; Simple in structure, easy accessibility.
Further, the axial ledge internal surface of described reducing valve body radially outwards is provided with radially cotter way, is provided with in the described radially cotter way and radially inserts the locating stud that camshaft is used for along the circumferential direction locating; Adopt locating stud to carry out being in transmission connection of circumferencial direction, simplify linkage structure, make the manufacture difficulty of reducing valve body and camshaft reduce, reduce to mount and dismount difficulty simultaneously, and the circumferencial direction location arranged preferably, the axially locating that cooperates fixing bolt reaches the purpose that limits the reducing valve body degrees of freedom.
The invention also discloses a kind of motorcycle of application engine camshaft assembly, described engine cam axle assembly is installed on motor, and this motor is used for motorcycle.
The invention has the beneficial effects as follows: engine cam axle assembly of the present invention and motorcycle thereof, in the reduction valve assembly of engine cam axle assembly, reducing valve body passes through bolt, compress backing plate, the shaft shoulder set on flange on the reducing valve body and the camshaft is fixed reducing valve body, can increase the area of contact that compresses of flange, guarantee the reliability that it is fastening, when having limited the axial freedom of reducing valve body, and to the degrees of freedom of circumferencial direction restriction also plays a role, circumferencial direction limit structure in conjunction with reducing valve body, guarantee the operational reliability of pressure relief assembly, mounting structure is simply compact, integrity is strong, and good positioning effect avoids taking place alignment error as far as possible; Simultaneously, make reducing valve body bear and to transmit and offset rotating inertia force and the impulsive load that the high engine speeds rotation produces, the fatigue fracture phenomenon do not occur, guarantee its working life, save user cost; Integrated flange can guarantee that not only centrifugal has comparatively abundant exercise space, can also guarantee the integrity and the compactedness of reducing valve body, further improves the load ability of reducing valve body, strengthens the ability that the body antifatigue is impacted, and prolongs its working life; Engine cam axle assembly of the present invention is used for motor and is used for motorcycle, reduces frequency of maintenance greatly, thereby reduces maintenance and maintenance cost.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a structural representation of the present invention;
Fig. 2 be this Fig. 1 along A-A to sectional view.
Embodiment
Fig. 1 is a structural representation of the present invention, Fig. 2 be this Fig. 1 along A-A to sectional view, as shown in the figure: the engine cam axle assembly of present embodiment, comprise camshaft 1 and reduction valve assembly, described camshaft 1 is provided with intake cam 1a and exhaust cam 1b, described reduction valve assembly comprises reducing valve body 2, centrifugal 6 and clamping bolt 4, described reducing valve body 2 and camshaft 1 are in the concentric secure fit of circumferencial direction, and described clamping bolt 4 screw-thread fit are threaded onto camshaft 1 and reducing valve body 2 is anchored on camshaft 1 vertically;
Described camshaft 1 is provided with the shaft shoulder that reducing valve body is spacing, and described reducing valve body 2 is provided with center hole and is coated at camshaft 1 back being compressed by clamping bolt 4 by center hole and is against the shaft shoulder; The structure that adopts the shaft shoulder to push against makes mounting structure of the present invention simply compact, and integrity is strong, and good positioning effect, avoids taking place alignment error as far as possible; Described centrifugal 6 is semicircular structure, one end is articulated in reducing valve body 2 in the mode that can rotate along camshaft 1 radial plane, the other end drives by a connecting pin 9 and is connected in the decompression valve rod 10 that passes reducing valve body 2 vertically, as shown in the figure, connecting pin 9 radially is connected in decompression valve rod 10 along decompression valve rods 10, conveniently drives it around self rotational; Described reducing valve body 2 center hole edges outwards are provided with axial ledge 1d vertically, and described hold-down bolt 4 presses the end face in the axial ledge 1d of reducing valve body 2 by compressing backing plate 3, outwards are that extend in the outside, end of pointing to camshaft 1; Described centrifugal 6 compressing around the mode that its hinging shaft freely rotates between backing plate 3 and the reducing valve body 2; In order to guarantee centrifugal 6 flexibility, the length that flange extends is greater than centrifugal thickness; Adopt flanged structure, can guarantee that not only centrifugal has comparatively abundant exercise space, can also guarantee the integrity and the compactedness of reducing valve body, further improve the load ability of reducing valve body, strengthen the ability that the body antifatigue is impacted, prolong its working life.
In the present embodiment, described decompression valve rod 10 is sunken in the valve rod groove 1c that camshaft 1 surface is provided with vertically and extends to the camming surface that exhaust cam 1b is used to make exhaust valve closing vertically, described decompression valve rod 10 radially protrudes in this camming surface along camshaft 1, and described decompression valve rod 10 is provided with the depression that is lower than or flushes in this camming surface when it goes to the phase place corresponding with this camming surface; When camshaft runs up under the driving of motor, driving decompression valve rod 10 by connecting pin 9 for centrifugal 6 rotates, decompression valve rod 10 makes its depression go to the camming surface that makes exhaust valve closing under centrifugal 6 driving, because depression is lower than or concordant this camming surface, does not then disturb closing of exhaust valve; Thereby the keying to exhaust valve does not cause interference, makes motor keep running well; Adopt hinging structure centrifugal, rubbing surface is little, motion flexibly, safety action sensitive reliable.
In the present embodiment, described centrifugal 6 is provided with and makes its return spring that is back to position of rest 5; As shown in the figure, return spring is the column spring, and an end connects centrifugal 6, and the other end connects reducing valve body 2, and has pretightening force, utilizes the spring return, and is sensitive reliable.
In the present embodiment, fixedly install the limiting stopper 8 that is useful on centrifugal 6 return position of restriction on the described reducing valve body 2; Guarantee that valve body is not impacted by centrifugal return, further improve the working life of reducing valve body.
In the present embodiment, described clamping bolt 4 is one and cooperates with camshaft 1 coaxial threaded and to screw in camshaft 1 end face, presses axial ledge end face in reducing valve body 2 with compressing backing plate 3.
In the present embodiment, the axial ledge 1d internal surface of described reducing valve body 2 radially outwards is provided with radially cotter way, is provided with in the described radially cotter way and radially inserts the locating stud 7 that camshaft is used for along the circumferential direction locating; Adopt locating stud 7 to carry out being in transmission connection of circumferencial direction, simplify linkage structure, make the manufacture difficulty of reducing valve body and camshaft reduce, reduce to mount and dismount difficulty simultaneously, and the circumferencial direction location arranged preferably, the axially locating that cooperates fixing bolt reaches the purpose that limits the reducing valve body degrees of freedom.
Present embodiment also discloses a kind of motorcycle of application engine camshaft assembly, and described engine cam axle assembly is installed on motor, and this motor is used for motorcycle.
Explanation is at last, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment to technological scheme of the present invention or/and be equal to replacement, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. engine cam axle assembly, comprise camshaft and reduction valve assembly, described camshaft is provided with the timing parts, intake cam and exhaust cam, it is characterized in that: described timing parts and reduction valve assembly lay respectively at the two ends of camshaft, described reduction valve assembly comprises reducing valve body, centrifugal and clamping bolt, described camshaft is provided with the shaft shoulder that reducing valve body is spacing, described reducing valve body is provided with center hole and is coated at camshaft by center hole, described reducing valve body center hole edge outwards is provided with axial ledge vertically, and described hold-down bolt compresses backing plate by one and presses in the axial ledge end face of reducing valve body and make reducing valve body be close proximity to the shaft shoulder; Described centrifugal is at the semicircular structure that compresses between backing plate and the reducing valve body, and an end be articulated in reducing valve body in the mode that can rotate along the camshaft radial plane, and the other end is connected in the decompression valve rod that passes reducing valve body vertically by a connecting pin.
2. engine cam axle assembly according to claim 1, it is characterized in that: described decompression valve rod is sunken in the valve rod groove that the camshaft surface is provided with vertically and extends to the camming surface that exhaust cam is used to make exhaust valve closing vertically, described decompression valve rod radially protrudes in this camming surface along camshaft, and described decompression valve rod is provided with the depression that is lower than or flushes in this camming surface when it goes to the phase place corresponding with this camming surface.
3. engine cam axle assembly according to claim 2 is characterized in that: described centrifugal is provided with and makes it be back to the return spring of position of rest.
4. engine cam axle assembly according to claim 3 is characterized in that: fixedly install the limiting stopper that is useful on centrifugal return position of restriction on the described reducing valve body.
5. motor pressure reduction structure assembly according to claim 4 is characterized in that: described clamping bolt is one and cooperates with the camshaft coaxial threaded and to screw in the camshaft end face, presses axial ledge end face in reducing valve body with compressing backing plate.
6. engine cam axle assembly according to claim 5, it is characterized in that: the axial ledge internal surface of described reducing valve body radially outwards is provided with radially cotter way, is provided with in the described radially cotter way and radially inserts the locating stud that camshaft is used for along the circumferential direction locating.
7. an application rights requires the motorcycle of the described engine cam axle assembly of 1 to 6 arbitrary claim, and it is characterized in that: described engine cam axle assembly is installed on motor, and this motor is used for motorcycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110135466 CN102226417A (en) | 2011-05-24 | 2011-05-24 | Engine camshaft assembly and motorcycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110135466 CN102226417A (en) | 2011-05-24 | 2011-05-24 | Engine camshaft assembly and motorcycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102226417A true CN102226417A (en) | 2011-10-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110135466 Pending CN102226417A (en) | 2011-05-24 | 2011-05-24 | Engine camshaft assembly and motorcycle |
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| Country | Link |
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| CN (1) | CN102226417A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102877910A (en) * | 2012-10-17 | 2013-01-16 | 四川银钢一通凸轮轴股份有限公司 | Decompression mechanism of engine and engine |
| JP2020063728A (en) * | 2018-10-19 | 2020-04-23 | スズキ株式会社 | Decompression device and valve mechanism |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5184586A (en) * | 1992-02-10 | 1993-02-09 | Tecumseh Products Company | Mechanical compression release for an internal combustion engine |
| CN1573034A (en) * | 2003-06-04 | 2005-02-02 | 本田技研工业株式会社 | Decompression device for internal combustion engine |
| CN201100151Y (en) * | 2007-11-16 | 2008-08-13 | 杜江 | Engine gas supply protrusion wheel axis combination |
| JP2011058474A (en) * | 2009-09-14 | 2011-03-24 | Suzuki Motor Corp | Four cycle engine |
-
2011
- 2011-05-24 CN CN 201110135466 patent/CN102226417A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5184586A (en) * | 1992-02-10 | 1993-02-09 | Tecumseh Products Company | Mechanical compression release for an internal combustion engine |
| CN1573034A (en) * | 2003-06-04 | 2005-02-02 | 本田技研工业株式会社 | Decompression device for internal combustion engine |
| CN201100151Y (en) * | 2007-11-16 | 2008-08-13 | 杜江 | Engine gas supply protrusion wheel axis combination |
| JP2011058474A (en) * | 2009-09-14 | 2011-03-24 | Suzuki Motor Corp | Four cycle engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102877910A (en) * | 2012-10-17 | 2013-01-16 | 四川银钢一通凸轮轴股份有限公司 | Decompression mechanism of engine and engine |
| JP2020063728A (en) * | 2018-10-19 | 2020-04-23 | スズキ株式会社 | Decompression device and valve mechanism |
| JP7124630B2 (en) | 2018-10-19 | 2022-08-24 | スズキ株式会社 | Valve train with decompression device |
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Application publication date: 20111026 |