CN201858005U - Cam decompression structure of motorcycle engine - Google Patents
Cam decompression structure of motorcycle engine Download PDFInfo
- Publication number
- CN201858005U CN201858005U CN2010205791603U CN201020579160U CN201858005U CN 201858005 U CN201858005 U CN 201858005U CN 2010205791603 U CN2010205791603 U CN 2010205791603U CN 201020579160 U CN201020579160 U CN 201020579160U CN 201858005 U CN201858005 U CN 201858005U
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- China
- Prior art keywords
- cam
- eccentric shoe
- axle journal
- motorcycle engine
- eccentric
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- Expired - Fee Related
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Abstract
The utility model relates to a cam decompression structure of a motorcycle engine. The structure comprises a camshaft. The camshaft comprises a cam and a shaft neck which axially extends along one side of the cam. An eccentric slider is movably sleeved on the shaft neck. The diameter of a shaft hole of the eccentric slider is greater than the external diameter of the shaft neck. A flange is arranged on the outer edge surface of the eccentric slider. The flange is adjacent to an inner dwell end of the cam, and the gravity center of the eccentric slider is close to an outer dwell end of the cam. A guide pin is arranged on the side surface of the cam and is close to the outer dwell end of the cam. A guide slot is radially formed on the inner edge surface of the eccentric slider. The guide slot is matched with the guide pin on the side surface of the cam. A spring, which is used for radially pushing the eccentric slider and ensuring the flange of the eccentric slider to be raised at the inner dwell end of the cam, is arranged on the shaft neck. The cam decompression structure of the motorcycle engine has a simple structure, is reliable in operating and can automatically realize the decompression function of the engine in starting stage.
Description
Technical field
The utility model relates to motorcycle engine, relates in particular to the cam pressure reduction structure of motorcycle engine.
Background technique
When motorcycle engine starts, 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 needs to adopt the mechanism of decompressor to reduce pressure, to guarantee that motor starts smoothly, then require the mechanism of decompressor to shed pressure-reducing function automatically behind the engine start, so that the motor proper functioning.The mechanism of decompressor of existing lower positioned camshaft type engine is arranged as and flies piece extension spring and eccentric cam, and structure is comparatively complicated, loses efficacy easily and produces the problem of noise, and the resistance of start is excessive, causes motor short working life, have a rebound when the starting problem of dozen tooth of pin.
The model utility content
The technical problem that the utility model solves is: a kind of cam pressure reduction structure of motorcycle engine is provided, has simple in structure, reliable operation, realize the advantage of the pressure-reducing function in engine start stage automatically.
The technical solution of the utility model is: a kind of cam pressure reduction structure of motorcycle engine, comprise camshaft, this camshaft comprises cam and along the axially extended axle journal of cam one side, it is characterized in that, activity is with an eccentric shoe on the described axle journal, and the shaft hole diameter of this eccentric shoe is greater than the outer diameter of axle journal, and the outer edge surface of eccentric shoe is provided with a flange, the contiguous cam of this flange closely stop Cheng Duan, the center of gravity of eccentric shoe is far stopped Cheng Duan near cam; Described flank of cam is provided with a guide finger, and this guide finger far stops Cheng Duan near cam, and the inner edge surface of eccentric shoe has guiding groove radially, and this guiding groove matches with the guide finger of flank of cam; Described axle journal is provided with and is used for radially passing, make the flange of eccentric shoe to protrude in the spring that cam closely stops Cheng Duan eccentric shoe.
The external cylindrical surface of described axle journal is provided with a boss, and this boss closely stops Cheng Duan near cam, and the inner edge of described eccentric shoe has the groove that matches with described boss.
The A/F of eccentric shoe groove leaves clearance distance greater than the width of axle journal boss between the two side of eccentric shoe guiding groove and the cam guide finger.
Described axle journal outer surface is provided with mounting hole, and this mounting hole closely stops Cheng Duan near cam, and an end of described spring drops in the described mounting hole, and the other end withstands on the inner edge surface of eccentric shoe.
There is angle α between the radial direction of the axial direction of spring with boss, 5 °≤α≤45 °.
Described guide finger is perpendicular to the side of cam.
The beneficial effects of the utility model are: on the one hand, because activity is with an eccentric shoe on the axle journal, the shaft hole diameter of this eccentric shoe is greater than the outer diameter of axle journal, flank of cam is provided with a guide finger, this guide finger far stops Cheng Duan near cam, the inner edge surface of eccentric shoe has guiding groove radially, this guiding groove matches with the guide finger of flank of cam, the eccentric shoe that is enclosed within on the axle journal can move along the radially-directed groove, and because the outer edge surface of eccentric shoe is provided with a flange, the contiguous cam of this flange closely stop Cheng Duan, axle journal is provided with and is used for eccentric shoe is radially passed, make the flange of eccentric shoe protrude in the spring that cam closely stops Cheng Duan, therefore the static or startup during starting stage when motor, the elastic force of spring promotes eccentric shoe and moves along guiding groove, and the flange of eccentric shoe protruded in cam and closely stopped Cheng Duan this moment, closely stopped Cheng Duanshi when camshaft turns to, engine exhaust port is not closed fully, thereby realizes pressure-reducing function; On the other hand, the center of gravity of eccentric shoe is far stopped Cheng Duan near cam, when engine speed reaches one regularly, rely on the centrifugal force of eccentric shoe to overcome spring force, under the guiding of guide finger, the flange of eccentric shoe closely stops the Cheng Duan withdrawal from cam, makes and closely stops Cheng Duanshi when camshaft turns to, engine exhaust port is in normal buttoned-up status, realizes the proper functioning of cam.The utility model is simple in structure, and reliable operation realizes the pressure-reducing function in engine start stage automatically.
Description of drawings
Structural representation of the present utility model when Fig. 1 is engine start;
Fig. 2 is the M place enlarged view of Fig. 1;
Structural representation of the present utility model when Fig. 3 normally moves for motor;
Fig. 4 is the N place enlarged view of Fig. 3;
Fig. 5 is the A-A schematic representation of Fig. 3;
Fig. 6 is the structural representation of axle journal and cam in the utility model;
Fig. 7 is the eccentric shoe structural representation;
Fig. 8 is the utility model and gear assembled construction schematic representation mutually.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Referring to Fig. 1～Fig. 7, a kind of cam pressure reduction structure of motorcycle engine, comprise camshaft, this camshaft comprises cam 2 and along the axially extended axle journal 1 of cam one side, axle journal 1 is one-body molded with cam 2, and activity is with an eccentric shoe 3 on axle journal 1, and the shaft hole diameter of this eccentric shoe 3 is greater than the outer diameter of axle journal 1, the outer margin contour shape of eccentric shoe 3 is similar to the outer margin contour shape of cam 2, and the outer rim girth of eccentric shoe 3 is less than the outer rim girth of cam 2.The outer edge surface of eccentric shoe 3 is provided with a flange 3a, the contiguous cam 2 of the flange 3a of eccentric shoe closely stop Cheng Duan, the center of gravity of eccentric shoe 3 is far stopped Cheng Duan near cam 2; The lateral vertical of cam 2 is provided with a guide finger 4, guide finger 4 far stops Cheng Duan near cams 2, guide finger 4 is parallel to the medial axis of axle journal 1, the inner edge surface of eccentric shoe 3 has guiding groove 3b radially, guiding groove 3b far stops Cheng Duan near cam 2, the guide finger 4 of flank of cam is inserted among the guiding groove 3b, and guiding groove 3b matches with the guide finger 4 of flank of cam.Axle journal 1 outer surface is provided with mounting hole 1b, this mounting hole 1b closely stops Cheng Duan near cam, in the mounting hole 1b of axle journal 1, be provided with and be used for radially passing, make the flange 3a of eccentric shoe to protrude in the spring 5 that cam closely stops Cheng Duan eccentric shoe 3, one end of spring 5 drops in the mounting hole 1b, and the other end of spring 5 withstands on the inner edge surface of eccentric shoe 3.The external cylindrical surface of axle journal 1 is provided with a boss 1a, and this boss 1a closely stops Cheng Duan near cam, and the inner edge of eccentric shoe 3 has the groove 3c that matches with boss 1a.Can drop into smoothly among the slide block groove 3c for ease of the boss 1a on the axle journal, the A/F of eccentric shoe groove 3c is greater than the width of boss 1a.There is angle α between the radial direction of the axial direction of spring 5 with boss 1a, angle α=5 ° in the present embodiment, the value of angle α can also be: α=25 ° or α=45 °.The opening of slide block groove 3c has an angle of inclination, the width of notch that is slide block groove 3c is greater than the width of the bottom land of slide block groove 3c, leave clearance distance between the two side of eccentric shoe guiding groove 3b and the cam guide finger 4, referring to Fig. 8, eccentric shoe 3 is enclosed within on the axle journal section between cam 2 and the gear 6.
The utility model is an automatic pressure-reducing function of realizing motor like this:
At first referring to Fig. 1, Fig. 2, when motorcycle engine is in halted state or motor and is in the start-up course, the elastic force of spring 5 is radially passed eccentric shoe 3, and eccentric shoe is parked on the axle journal boss 1a, and the flange 3a of eccentric shoe protrudes in cam and closely stops Cheng Duan.In the engine starting process, motor closely stops Cheng Duanshi for slowly running when camshaft turns to, and engine exhaust port is not closed fully, thereby realizes pressure-reducing function.
Then referring to Fig. 3, Fig. 4, move to normal fast state behind the engine start, axle journal 1 also drives eccentric shoe 3 high-speed motions simultaneously, the centrifugal force of dependence eccentric shoe 3 overcomes the elastic force of spring 5, under the guiding of guide finger 4, the flange of eccentric shoe closely stops the Cheng Duan withdrawal from cam, after eccentric shoe 3 withdrawals, boss 1a on the axle journal 1 drops among the groove 3c of eccentric shoe 3, making the flange of eccentric shoe closely stop Cheng Duan from cam withdraws fully and prevents eccentric shoe 3 swing, boss 1a in this example also can substitute with radial peg, as long as it is main with eccentric shoe 3 cards that radial peg can drop among the groove 3c, closely stop Cheng Duanshi when camshaft turns to, engine exhaust port is closed fully, realizes the proper functioning of cam.
Claims (6)
1. the cam pressure reduction structure of a motorcycle engine, comprise camshaft, this camshaft comprises cam (2) and along the axially extended axle journal of cam one side (1), it is characterized in that: described axle journal (1) is gone up activity and is with an eccentric shoe (3), the shaft hole diameter of this eccentric shoe (3) is greater than the outer diameter of axle journal (1), the outer edge surface of eccentric shoe (3) is provided with a flange (3a), the contiguous cam of this flange (3a) (2) closely stop Cheng Duan, the center of gravity of eccentric shoe (3) is far stopped Cheng Duan near cam (2); Described cam (2) side is provided with a guide finger (4), and this guide finger (4) far stops Cheng Duan near cam (2), and the inner edge surface of eccentric shoe (3) has guiding groove (3b) radially, and this guiding groove (3b) matches with the guide finger (4) of flank of cam; Described axle journal (1) is provided with and is used for radially passing, make the flange (3a) of eccentric shoe to protrude in the spring (5) that cam closely stops Cheng Duan eccentric shoe (3).
2. according to the cam pressure reduction structure of the described motorcycle engine of claim 1, it is characterized in that: the external cylindrical surface of described axle journal (1) is provided with a boss (1a), this boss (1a) closely stops Cheng Duan near cam, and the inner edge of described eccentric shoe (3) has the groove (3c) that matches with described boss (1a).
3. according to the cam pressure reduction structure of the described motorcycle engine of claim 2, it is characterized in that: the A/F of eccentric shoe groove (3c) leaves clearance distance greater than the width of axle journal boss (1a) between the two side of eccentric shoe guiding groove (3b) and the cam guide finger (4).
4. according to the cam pressure reduction structure of the described motorcycle engine of claim 2, it is characterized in that: described axle journal (1) outer surface is provided with mounting hole (1b), this mounting hole (1b) closely stops Cheng Duan near cam, one end of described spring (5) drops in the described mounting hole (1b), and the other end withstands on the inner edge surface of eccentric shoe (3).
5. according to the cam pressure reduction structure of the described motorcycle engine of claim 4, it is characterized in that: have angle α between the radial direction of the same boss of axial direction (1a) of spring (5), 5 °≤α≤45 °.
6. according to the cam pressure reduction structure of the described motorcycle engine of claim 1, it is characterized in that: described guide finger (4) is perpendicular to the side of cam (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205791603U CN201858005U (en) | 2010-10-27 | 2010-10-27 | Cam decompression structure of motorcycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205791603U CN201858005U (en) | 2010-10-27 | 2010-10-27 | Cam decompression structure of motorcycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201858005U true CN201858005U (en) | 2011-06-08 |
Family
ID=44103815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205791603U Expired - Fee Related CN201858005U (en) | 2010-10-27 | 2010-10-27 | Cam decompression structure of motorcycle engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201858005U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454073A (en) * | 2014-12-10 | 2015-03-25 | 重庆市银钢一通科技有限公司 | Engine and camshaft decompressor thereof |
| CN109154710A (en) * | 2016-05-27 | 2019-01-04 | 深圳市大疆创新科技有限公司 | System for balancing the center of gravity of zoom lens |
-
2010
- 2010-10-27 CN CN2010205791603U patent/CN201858005U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454073A (en) * | 2014-12-10 | 2015-03-25 | 重庆市银钢一通科技有限公司 | Engine and camshaft decompressor thereof |
| CN109154710A (en) * | 2016-05-27 | 2019-01-04 | 深圳市大疆创新科技有限公司 | System for balancing the center of gravity of zoom lens |
| US10948681B2 (en) | 2016-05-27 | 2021-03-16 | SZ DJI Technology Co., Ltd. | System for balancing center of gravity of a zoom lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110608 Termination date: 20131027 |