CN101187319A - Pressure reducing mechanism of lower camshaft type engine - Google Patents
Pressure reducing mechanism of lower camshaft type engine Download PDFInfo
- Publication number
- CN101187319A CN101187319A CNA2007100931944A CN200710093194A CN101187319A CN 101187319 A CN101187319 A CN 101187319A CN A2007100931944 A CNA2007100931944 A CN A2007100931944A CN 200710093194 A CN200710093194 A CN 200710093194A CN 101187319 A CN101187319 A CN 101187319A
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- wheel shaft
- centrifugal
- arc
- timing gear
- reduce pressure
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- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 241001484259 Lacuna Species 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000006837 decompression Effects 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a decompression mechanism of a lower camshaft type engine, wherein a timing gear is hinged with a centrifugal block, a return spring is connected with the centrifugal block and the timing gear, the axial clearance of the timing gear is matched with a wheel shaft for decompression, one end of the wheel shaft is inserted into a notch groove arranged at the initial position of an exhaust cam and can rotate, the cross section of one end of the wheel shaft inserted into the notch groove of the exhaust cam is arc-shaped, the diameter of the end is larger than the height of the notch groove, the distance between the chord edge of the arc and the arc top is smaller than the height of the notch groove, the other end of the wheel shaft is provided with a radial poking pin, the axial lead of the poking pin and the chord plane of the arc form an included angle of 30-60 degrees, and the radial poking pin is inserted into a shifting fork at. The engine is effectively decompressed when being started through a simple structure, the decompression power transmission is stable and reliable, and the production cost can be reduced.
Description
Technical field
The present invention relates to a kind of mechanism of decompressor of motor, particularly a kind of mechanism of decompressor of lower positioned camshaft type engine of motorcycle.
Background technique
The motorcycle engine that recoil starts increases in discharge capacity, and after transmitted power, moment of torsion strengthen, motor can form bigger impact force when start-up course, devices such as the electric startup of damage easily, pin startup, particularly be easy to operator are damaged in the pin start-up course, therefore, more smooth for making engine start, generally adopt the device that cylinder pressure when reducing engine start is set on motor, to guarantee the smooth startup of motor.The device of cylinder pressure when being used to reduce engine start at present, mainly be adopt be to install on the timing driven gear that camshaft connects one can slide displacement slide block, slide block is provided with two bar holes and is slidingly matched with two rivets that are arranged on the timing driven gear diameter, being provided with one between two bar holes makes camshaft be positioned at wherein opening, the shift fork of installing on the slide block is connected with the crank throw that is connected on the camshaft by bearing pin, the working surface track of crank throw is a curve, and this working surface is facing to the fore-set lower end of distribution device.During this device work, make shift fork stir crank throw by slider displacement and rotate, make the curve working surface of crank throw contact the position of limiting fore-set with fore-set, reduce the pressure of cylinder, motor is started smoothly around bearing pin.This decompressor is by a plurality of parts combinations such as slide block, shift fork, bearing pin, crank throw, complex structure not only, and the transmission of power link that is used to reduce pressure is many, thereby it is also many to influence the link of its proper functioning, many because of parts simultaneously, the production and processing cost is also higher relatively.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of mechanism of decompressor of lower positioned camshaft type engine is provided, it makes by simple structure starts effectively to be reduced pressure when starting, and its decompression transmission of power is reliable and stable, and it is low to reduce production costs.
The object of the present invention is achieved like this: timing gear circumferentially are fixed on the lower arranging cam axle adjacent with exhaust cam, centrifugal axial end that is positioned at timing gear of one arc, centrifugal fixed point end and timing gear are hinged, free end of centrifugal block is walked around lower arranging cam axle, one return spring is connected on centrifugal and the timing gear, the axial clearance of described timing gear cooperates a wheel shaft that is used to reduce pressure, the initial position of the corresponding exhaust cam of the described wheel shaft that is used to reduce pressure, the initial position of exhaust cam is provided with a gap slot, wheel shaft one end that is used for reducing pressure inserts the gap slot of exhaust cam and can rotate in gap slot, the cross section of one end of the gap slot of the wheel shaft insertion exhaust cam that is used for reducing pressure is arc, the diameter of this end is greater than the height of gap slot, the distance on arc string back gauge arc top is less than the height of gap slot, the other end of the wheel shaft that is used to reduce pressure is provided with radially finger, the shaft axis of this finger and arc 30 °～60 ° angles of string plane formation, described free end of centrifugal block is provided with shift fork, and the radially finger on the wheel shaft that is used for reducing pressure inserts centrifugal free-ended shift fork.
Owing to adopted such scheme, cooperate a wheel shaft that is used to reduce pressure in the axial clearance of timing gear, wheel shaft one end that is used in decompression inserts in the gap slot of initial position setting of exhaust cam and can rotate.Because it is arc that the wheel shaft that is used for reducing pressure inserts the cross section of an end of gap slot, the diameter of this end is greater than the height of gap slot, the distance on arc string back gauge arc top is less than the height of gap slot, the wheel shaft that is used for reducing pressure gap slot rotate 90 ° will with rotate before form two kinds of just different situations: wherein a kind of situation is that the string limit intersects with the exhaust cam side face, the side face of the wheel shaft that is used to reduce pressure just exceeds gap slot, the exhaust rocker arm that contacts with the exhaust cam side face can be pushed up from the exhaust cam side face, make between exhaust rocker arm and the exhaust cam and form the gap, this clearance distance just becomes exhaust rocker arm and drives the gap that exhaust valve is opened, for reducing inner cylinder pressure, help the startup of motor thus; Another kind of situation is that the string limit is corresponding with the exhaust cam side face, the string plane of the wheel shaft that is used to reduce pressure is lower than the exhaust cam side face, exhaust rocker arm contacts with the exhaust cam side face, exhaust rocker arm moves along the exhaust cam side face, drive unlatching that exhaust valve goes round and begins again, close, make the motor can proper functioning.The rotation of the wheel shaft that is used to reduce pressure is by centrifugal drive.Because the other end of the wheel shaft that is used to reduce pressure is provided with radially finger, this radially finger insert in the centrifugal free-ended shift fork, a return spring is connected on centrifugal and the timing gear, the rotation of the described wheel shaft that is used to reduce pressure is just controlled by centrifugal motion.When motor is in out-of-work state, under the effect of return spring, draw close lower arranging cam axle for centrifugal, remain static, the wheel shaft that is used to reduce pressure is stirred by centrifugal free-ended shift fork and is formed the string limit and intersect with the exhaust cam side face, exhaust rocker arm is pushed up from the exhaust cam side face, open exhaust valve, reduce inner cylinder pressure; Behind engine start, the timing gear rotation makes centrifugal to produce centrifugal motion, centrifugal free-ended shift fork stirred the wheel shaft that is used to reduce pressure and rotated, it is corresponding with the exhaust cam side face to form the string limit, the string plane that is used in the wheel shaft of decompression is lower than the exhaust cam side face, exhaust rocker arm contacts with the exhaust cam side face, exhaust rocker arm drives exhauxt valve opens, closes under the rotation of exhaust cam, form proper functioning, because the string plane of the wheel shaft that is used to reduce pressure is lower than the exhaust cam side face, can not interfere the proper functioning of exhaust rocker arm.The shaft axis of finger and the string plane on the arc shaft part form 30 °～60 ° angles on the described wheel shaft that is used to reduce pressure, can make centrifugal being that hinge is when doing centrifugal motion with fixed point end like this, its free end moves little corner, the wheel shaft that just can be used in decompression rotates into the state that the string plane is lower than the exhaust cam side face, allows exhaust rocker arm enter normal working state very soon.
The present invention makes by simple structure and starts effectively to be reduced pressure when starting, and its decompression transmission of power is reliable and stable, and because compared with prior art, its part reduces, and processing and fabricating is easy, and it is low to reduce production costs.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a timing gear of the present invention and centrifugal assembling schematic representation;
Fig. 3 is centrifugal schematic representation that remains static;
Fig. 4 is the structural representation of the wheel shaft that is used to reduce pressure of the present invention;
Fig. 5 is that the B of Fig. 4 is to view;
Fig. 6 is centrifugal schematic representation that is in centrifugal motion.
In the accompanying drawing, 1 is camshaft, and 2 is timing gear, and 3 is exhaust cam, and 3a is a gap slot, 4 is centrifugal, and 5 is straight pin, and 6 is return spring, and 7 is the wheel shaft that is used to reduce pressure, and 7a is the string plane, 8 are finger radially, and 9 is position limit pin, and 10 is exhaust rocker arm, and 11 is stiffening rib, and 12 is breach.
Embodiment
Referring to figs. 1 through Fig. 6, the timing gear 2 of lower positioned camshaft type engine circumferentially are fixed on the lower arranging cam axle 1 adjacent with exhaust cam 3.Centrifugal 4 axial end that is positioned at timing gear 2 of one arc, centrifugal 4 fixed point end and timing gear 2 are hinged, form on the riveted fixing timing gear 2 for centrifugal 4 hingedly rotationally by straight pin 5, centrifugal 4 free end is walked around lower arranging cam axle 1 and is held relative with fixed point.One return spring 6 is connected on centrifugal 4 and the timing gear 2, and this return spring 6 is extension spring, and the one end is connected centrifugal 4 cranking arm near fixed point end place, and the other end is connected the opposite direction that is positioned at centrifugal motion on the timing gear 2.The axial end of timing gear 2 is provided with many stiffening ribs 11, and stiffening rib 11 is one-body molded with timing gear 2.Wherein have a stiffening rib corresponding with centrifugal 4 fixed point end, centrifugal 4 hinge is positioned on this stiffening rib, and the intensity of hinged place is strengthened; Other has two V-shaped free ends of arranging corresponding centrifugal 4 of stiffening rib, and the limit in opposite directions of two stiffening ribs of V-shaped layout is respectively equipped with the breach 12 to centrifugal 4 sports limiting, limits by 12 pairs centrifugal 4 distance of rotating of two breach.The axial clearance of timing gear 2 cooperates a wheel shaft that is used to reduce pressure 7, the initial position of the wheel shaft 7 corresponding exhaust cams 3 that are used to reduce pressure, and in the hole that is provided with between two stiffening ribs 11 of V-shaped layout, its two ends are overhanging respectively.The initial position of exhaust cam 3 is provided with a gap slot 3a, and promptly this gap slot 3a is positioned at the basic circle of exhaust cam 3 and the intersection of cam profile, and the bottom surface of gap slot 3a is an arc surface.Wheel shaft 7 one ends that are used for reducing pressure insert the gap slot 3a of exhaust cam and can rotate in gap slot, the cross section of the end of the gap slot 3a of the wheel shaft 7 insertion exhaust cams that are used for reducing pressure is arc, the diameter of this end is greater than the height of gap slot 3a, and the distance on arc string back gauge arc top is less than the height of gap slot.Wheel shaft 7 cross sections that are used to reduce pressure arc for major arc arc or semi-circle is arc, wheel shaft 7 cross sections that are used to reduce pressure be major arc when arc, its through the diameter in the center of circle greater than string limit and parallel with the string limit; Wheel shaft 7 cross sections that are used to reduce pressure be semi-circle when arc, its string limit is the diameter through the center of circle.The other end of the wheel shaft 7 that is used to reduce pressure is provided with radially finger 8, and radially finger 8 adopts interference fit to fix or be threaded and is fixed on the wheel shaft 7 that is used to reduce pressure, and perhaps radially finger 8 and the wheel shaft 7 one machine shapings that are used to reduce pressure all can reach effect same.The shaft axis of this finger 8 and arc string plane 7a form 30 °～60 ° angle α, and the angle α of present embodiment is 45 °, its best results.The wheel shaft 7 that is used to reduce pressure is multidiameter shaft, and wherein the big footpath section of multidiameter shaft cooperates with the interporal lacuna that timing gear 2 are provided with, and the sponson of big footpath section is provided with radially finger 8, and the path section cross section of multidiameter shaft is arc, among the gap slot 3a of overhanging insertion exhaust cam.Centrifugal 4 free end is provided with shift fork, and the radially finger 8 on the wheel shaft that is used for reducing pressure inserts centrifugal 4 free-ended shift fork.Described shift fork is for being fixedly connected on 9, two position limit pins of centrifugal 4 free-ended two position limit pins 9 and centrifugal 4 one machine shaping, and means of fixation commonly used is fixed on centrifugal perhaps to adopt welding, interference fit, be threaded etc.Two position limit pins 9 are coaxial with the wheel shaft 7 that is used to reduce pressure, and extend to the timing gear direction by centrifugal 4.Has the space of inserting between two position limit pins 9 for the radially finger on the wheel shaft 7 that is used to reduce pressure 8.Because two position limit pins 9 are to extend to the timing gear direction by centrifugal 4, after radially finger 8 on the wheel shaft 7 that is used to reduce pressure inserts between two position limit pins 9, radially finger 8 is located between centrifugal 4 and the timing gear 2, form axial limiting thus, the wheel shaft that is used to reduce pressure 7 with timing gear 2 Spielpassung can not come off from axially withdrawing from the wheel shaft 7 that is used to reduce pressure.
When motor quits work, exhaust rocker arm 10 is in the initial position of exhaust cam, corresponding with gap slot on the exhaust cam, this is centrifugal and remains static, the breach that a position limit pin of centrifugal free end shift fork is arranged in a stiffening rib is subjected to spacing, make centrifugal can not contact with camshaft generation bump, be used to the wheel shaft that reduces pressure simultaneously and dial to the state that string limit and exhaust cam side face intersect by shift fork, be used in the gap slot above exhaust cam of the wheel shaft of decompression, the wheel shaft that is used to reduce pressure pushes up exhaust rocker arm 10 from the exhaust cam side face, make exhaust valve open certain interval, the pressure in the engine cylinder reduces, and motor can be started smoothly.Behind engine start, the timing gear rotation makes centrifugal to produce centrifugal motion, centrifugal free end shift fork stirred the wheel shaft that is used to reduce pressure, and to turn to the string limit corresponding with the exhaust cam side face, the string plane that is used in the wheel shaft of decompression is lower than the exhaust cam side face in gap slot, can't contact exhaust rocker arm, exhaust rocker arm by the side face controlled motion of exhaust cam exhaust valve can normally be opened, be cut out and carry out work.
The present invention's working procedure that reduces pressure is narrated in summary of the invention, does not repeat them here.Though the present invention discloses as above with preferred embodiment; right its is not that any person of ordinary skill in the field is in the spirit and scope that do not break away from invention in order to qualification the present invention; when can doing a little change and improvement, therefore the protection domain of invention when with claim the person of being defined be as the criterion.
Claims (8)
1. the mechanism of decompressor of a lower positioned camshaft type engine, timing gear circumferentially are fixed on the lower arranging cam axle adjacent with exhaust cam, centrifugal axial end that is positioned at timing gear of one arc, centrifugal fixed point end and timing gear are hinged, free end of centrifugal block is walked around lower arranging cam axle, one return spring is connected on centrifugal and the timing gear, it is characterized in that: the axial clearance of described timing gear cooperates a wheel shaft that is used to reduce pressure, the initial position of the corresponding exhaust cam of the described wheel shaft that is used to reduce pressure, the initial position of exhaust cam is provided with a gap slot, wheel shaft one end that is used for reducing pressure inserts the gap slot of exhaust cam and can rotate in gap slot, the cross section of one end of the gap slot of the wheel shaft insertion exhaust cam that is used for reducing pressure is arc, the diameter of this end is greater than the height of gap slot, the distance on arc string back gauge arc top is less than the height of gap slot, the other end of the wheel shaft that is used to reduce pressure is provided with radially finger, the shaft axis of this finger and arc 30 °～60 ° angles of string plane formation, described free end of centrifugal block is provided with shift fork, and the radially finger on the wheel shaft that is used for reducing pressure inserts centrifugal free-ended shift fork.
2. the mechanism of decompressor of lower positioned camshaft type engine according to claim 1, it is characterized in that: the described wheel shaft that is used to reduce pressure is a multidiameter shaft, the cross section of the path section of multidiameter shaft is arc, the big footpath section of multidiameter shaft cooperates with the interporal lacuna that timing gear are provided with, and the sponson of big footpath section is provided with radially finger.
3. the mechanism of decompressor of lower positioned camshaft type engine according to claim 1 and 2 is characterized in that: the described wheel shaft cross section that is used to reduce pressure arc is arc or semi-circle is arc for major arc.
4. the mechanism of decompressor of lower positioned camshaft type engine according to claim 1, it is characterized in that: described shift fork is for being fixedly connected on centrifugal free-ended two position limit pins, two position limit pins are coaxial with the wheel shaft that is used to reduce pressure, and have the space of inserting for the finger on the wheel shaft that is used to reduce pressure between two position limit pins.
5. the mechanism of decompressor of lower positioned camshaft type engine according to claim 4, it is characterized in that: described two position limit pins extend to the timing gear direction by centrifugal.
6. the mechanism of decompressor of lower positioned camshaft type engine according to claim 1, it is characterized in that: the axial end of described timing gear is provided with many stiffening ribs, wherein there is a stiffening rib corresponding with centrifugal fixed point end, two corresponding free end of centrifugal block of the V-shaped layout of stiffening rib are arranged, and the wheel shaft that is used to reduce pressure is between two stiffening ribs of V-shaped layout.
7. the mechanism of decompressor of lower positioned camshaft type engine according to claim 6, it is characterized in that: the limit in opposite directions of two stiffening ribs of described V-shaped layout is respectively equipped with the breach to centrifugal sports limiting.
8. the mechanism of decompressor of lower positioned camshaft type engine according to claim 1, it is characterized in that: the angle on the shaft axis of the finger of the described wheel shaft that is used to reduce pressure and string plane is 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100931944A CN101187319B (en) | 2007-12-21 | 2007-12-21 | Lower positioned camshaft type engine decompression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100931944A CN101187319B (en) | 2007-12-21 | 2007-12-21 | Lower positioned camshaft type engine decompression device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101187319A true CN101187319A (en) | 2008-05-28 |
| CN101187319B CN101187319B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100931944A Expired - Fee Related CN101187319B (en) | 2007-12-21 | 2007-12-21 | Lower positioned camshaft type engine decompression device |
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| CN (1) | CN101187319B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975099A (en) * | 2010-10-27 | 2011-02-16 | 重庆隆鑫机车有限公司 | Underslung single camshaft engine decompression mechanism of motorcycle |
| TWI451031B (en) * | 2010-05-12 | 2014-09-01 | Sanyang Industry Co Ltd | Engine decompression mechanism |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ285909B6 (en) * | 1996-04-09 | 1999-11-17 | Motor Jikov A. S. | Decompression apparatus of internal combustion engine |
| JP3366198B2 (en) * | 1996-11-29 | 2003-01-14 | 本田技研工業株式会社 | Engine decompression mechanism |
| CN2677622Y (en) * | 2004-01-30 | 2005-02-09 | 重庆力帆实业（集团）有限公司 | Centrifugal decompressor of engine |
| CN2739365Y (en) * | 2004-10-19 | 2005-11-09 | 无锡开普动力有限公司 | Engine decompression device |
| CN2878680Y (en) * | 2006-01-16 | 2007-03-14 | 重庆银钢汽车配件制造有限责任公司 | Universal engine distribution can shaft combination |
| CN2900798Y (en) * | 2006-03-28 | 2007-05-16 | 重庆隆鑫工业（集团）有限公司 | Pressure reducer for starting gasoline engine |
-
2007
- 2007-12-21 CN CN2007100931944A patent/CN101187319B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI451031B (en) * | 2010-05-12 | 2014-09-01 | Sanyang Industry Co Ltd | Engine decompression mechanism |
| CN101975099A (en) * | 2010-10-27 | 2011-02-16 | 重庆隆鑫机车有限公司 | Underslung single camshaft engine decompression mechanism of motorcycle |
| CN101975099B (en) * | 2010-10-27 | 2016-03-16 | 重庆隆鑫机车有限公司 | Underslung single camshaft engine decompression mechanism of motorcycle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101187319B (en) | 2010-06-23 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Chongqing Longxin Engine Ltd. Assignor: Chongqing Longxin Engine Co., Ltd. Contract record no.: 2012500000045 Denomination of invention: Lower positioned camshaft type engine decompression device Granted publication date: 20100623 License type: Exclusive License Open date: 20080528 Record date: 20120508 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20080528 Assignee: Chongqing Longxin Engine Ltd. Assignor: Chongqing Longxin Engine Co., Ltd. Contract record no.: 2012500000045 Denomination of invention: Lower positioned camshaft type engine decompression device Granted publication date: 20100623 License type: Exclusive License Record date: 20120508 |
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Granted publication date: 20100623 Termination date: 20131221 |