CN202360171U - Pressure relief start mechanism of camshaft - Google Patents
Pressure relief start mechanism of camshaft Download PDFInfo
- Publication number
- CN202360171U CN202360171U CN2011204932670U CN201120493267U CN202360171U CN 202360171 U CN202360171 U CN 202360171U CN 2011204932670 U CN2011204932670 U CN 2011204932670U CN 201120493267 U CN201120493267 U CN 201120493267U CN 202360171 U CN202360171 U CN 202360171U
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- camshaft
- hole
- spindle
- connecting pin
- gear
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Abstract
The utility model provides a pressure relief start mechanism of a camshaft, belonging to the technical field of camshafts and solving the problem that the traditional engine starts difficultly. The pressure relief start mechanism of the camshaft comprises the camshaft, an air inlet cam, an air outlet cam, gears, a centrifugal swing device and a connecting pin, wherein the inside of the camshaft is provided with a cavity; a spindle is arranged in the cavity; the camshaft and the side wall of the spindle are provided with a through hole and a gap matched with the through hole respectively; and a ball is arranged at the through hole; and one end of the connecting pin is connected with the camshaft, and the other end of the connecting pin is connected with the centrifugal swing device after passing through a chute arranged on the side wall of the camshaft. According to the pressure relief start mechanism, a misplaced structure is formed by using the gap on the spindle and the through hole on the camshaft when the engine is low in rotating speed or stops, the ball ejects outwards slightly to prevent an exhaust valve lifter from returning completely, an exhaust valve can be opened slightly when the engine dies and, therefore, the air compression ratio is reduced, and the next start is facilitated.
Description
Technical field
The utility model belongs to the camshaft technical field, relates to a kind of release starting mechanism of camshaft.
Background technique
Engine piston can stop, and is to reach a balance because the piston two ends are stressed.Behind engine misses, because inertia, the crank-connecting rod piston mechanism also will be proceeded back and forth to move up and down.Cylinder head valve normal switch, obviously when be in compression stroke, owing to advance, valve closes, cylinder pressure can not discharge reduction voluntarily.Position cylinder internal air pressure this moment that piston stops is higher relatively, and next circulation needs to suck new gas and compresses when motor need start moment; Near the compression terminal point; Can produce very big resistance to compression pression, directly start if the cylinder internal air pressure is not reduced pressure, will be very difficult; Particularly pin starts, and is especially all the more so to large-duty engine.
Summary of the invention
The purpose of the utility model is existing the problems referred to above during to existing engine start, and proposed a kind of before engine misses decompression exhaust, the release starting mechanism of the camshaft of being convenient to start next time.
The purpose of the utility model can realize through following technical proposal: a kind of release starting mechanism of camshaft; Comprise camshaft, camshaft is provided with intake cam, exhaust cam and gear, it is characterized in that; Described release starting mechanism also comprises and is arranged on centrifugal swing device and the connecting pin of face of gear to this side of exhaust cam; Camshaft inside has cavity, is provided with a spindle in the cavity, and described spindle also can freely rotate with respect to camshaft with the coaxial setting of camshaft; Offer respectively on the sidewall of camshaft and spindle through hole and can with through hole over against last breach; The through hole is provided with spheroid, and an end of connecting pin is connected with camshaft, and the other end passes a chute that is opened on the camshaft sidewall and is connected with the centrifugal swing device.
In the release starting mechanism of above-mentioned camshaft; Described centrifugal swing device comprises and gets rid of piece swing member and Returnning spring, get rid of piece swing member and gear rotation and be dynamically connected, above-mentioned connecting pin with get rid of the piece swing member and be connected; One end of Returnning spring is connected with gear, the other end with get rid of the piece swing member and be connected.
Under the centrifugal action, get rid of the piece swing member and relatively rotate, drive spindle through connecting pin simultaneously and together rotate, make breach and the through hole on the camshaft on the spindle, fall into for spheroid over against last with respect to gear and camshaft.
In the release starting mechanism of above-mentioned camshaft, described through hole also is provided with a separation sleeve, and the outer end thickness of separation sleeve is than inner thicker.
In the release starting mechanism of above-mentioned camshaft, the described piece swing member that gets rid of is " C " shape, and one of which end and gear rotation are dynamically connected.
Compared with prior art; The release starting mechanism of this camshaft utilizes breach and the through hole on the camshaft on the spindle lower or form the structure of dislocation when stopping in engine speed, and spheroid is slightly outwards ejected, and stops the complete return of exhaust valve tappet; Can when engine dies, open exhaust valve a bit; Reduce the air compression ratio, can when start next time, make pressure lighter, be convenient to starting.And behind the engine start, the mechanism of decompressor sheds pressure-reducing function automatically, so that the internal-combustion engine proper functioning is simple and convenient.
Description of drawings
Fig. 1 is the structural representation that the utility model provides.
Fig. 2 is the plan structure schematic representation that the utility model provides.
Fig. 3 is the structural representation of spindle.
Among the figure, 1, camshaft; 1a, through hole; 1b, chute; 2, intake cam; 3, exhaust cam; 4, gear; 5, get rid of the piece swing member; 6, Returnning spring; 7, spindle; 71, breach; 72, connecting pin; 8, separation sleeve; 9, get rid of the piece rivet; 10, spring rivet; 11, exhaust valve tappet; 12, spheroid.
Embodiment
Below be the specific embodiment of the utility model and combine accompanying drawing, the technological scheme of the utility model is done further to describe, but the utility model is not limited to these embodiments.
As shown in figures 1 and 3, the release starting mechanism of this camshaft comprises camshaft 1, and camshaft 1 is provided with intake cam 2, exhaust cam 3 and gear 4, and gear 4 is provided with towards this side of exhaust cam 3 and gets rid of piece swing member 5 and Returnning spring 6.The inside of camshaft 1 has cavity, is provided with a spindle 7 in the cavity, and spindle 7 also can freely rotate with respect to camshaft 1 with camshaft 1 coaxial setting; The outer side surface of spindle 7 is provided with breach 71, camshaft 1 then offer through hole 1a in exhaust cam 3 positions, the height of breach 71 and corresponding through hole 1a is identical and can be with the rotation of spindle 7 over against last or stagger; Through hole 1a place is provided with spheroid 12; It is little that through hole 1a place also is provided with outer end opening, and the separation sleeve 8 that interior end opening is big carries out spacing to spheroid 12.The lower end vertical fixing of spindle 7 is connected with connecting pin 72, the outer end of connecting pin 72 pass on the camshaft 1 chute 1b with get rid of piece swing member 5 and be connected.
As shown in Figure 2, get rid of piece swing member 5 and be " C " shape, the one of which end gets rid of piece rivet 9 and gear 4 movable riveted joints through one, and the other end is connected with Returnning spring 6, and the other end of Returnning spring 6 then is connected with a spring rivet 10 that is fixed on the gear 4.
Before the engine start; Spheroid 12 is in state as shown in Figure 1, and this moment, the working end of spheroid 12 was higher than cam base circle, was stuck between exhaust cam 3 and the exhaust valve tappet 11; Exhaust valve tappet 11 is return fully, lets exhaust valve when motor is static, be in open mode with this.
Behind the engine start, camshaft 1 and gear 4 fast rotational are when reaching certain rotating speed; Getting rid of piece swing member 5 rotates around getting rid of piece rivet 9 under centrifugal action; And drive spindles 7 through connecting pin 72 and together rotate, the through hole 1a that makes breach 71 and exhaust cam 3 places on the spindle 7 over against, fall into for spheroid 12; Exhaust valve tappet 11 is return fully; Therefore during engine start to proper functioning, the state when this release starting mechanism does not disturb the motor proper functioning, this moment, Returnning spring 6 was stretched.
When to stall, engine speed slowly reduces, and gets rid of piece swing member 5 suffered centrifugal force and reduces., when rotating speed drop to a certain degree get rid of piece swing member 5 reset owing to the reset response of Returnning spring 6 this moment; And drive spindles 7 through connecting pin 72 and rotate and reset, breach 71 on the spindle 7 and corresponding through hole 1a dislocation, the outer wall of spindle 7 ejects spheroid 12; The working end of spheroid 12 is positioned at again exceeds the cam base circle position, be stuck between exhaust valve tappet 11 and the exhaust cam 3, exhaust valve is opened; Deflate, reduce air compression than reaching the purpose of being convenient to start then.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.
Claims (4)
1. the release starting mechanism of a camshaft; Comprise camshaft (1), camshaft (1) is provided with intake cam (2), exhaust cam (3) and gear (4), it is characterized in that; Described release starting mechanism also comprises and is arranged on centrifugal swing device and the connecting pin (72) of gear (4) towards this side of exhaust cam (3); Camshaft (1) inside has cavity, is provided with a spindle (7) in the cavity, and described spindle (7) also can freely rotate with respect to camshaft (1) with the coaxial setting of camshaft (1); Offer respectively on the sidewall of camshaft (1) and spindle (7) through hole (1a) and can with through hole (1a) over against last breach (71); Through hole (1a) locates to be provided with spheroid (12), and an end of connecting pin (72) is connected with camshaft (1), and the other end passes a chute (1b) that is opened on camshaft (1) sidewall and is connected with the centrifugal swing device.
2. the release starting mechanism of camshaft according to claim 1; It is characterized in that; Described centrifugal swing device comprises and gets rid of piece swing member (5) and Returnning spring (6), get rid of piece swing member (5) and be rotationally connected with gear (4), above-mentioned connecting pin (72) with get rid of piece swing member (5) and be connected; One end of Returnning spring (6) is connected with gear (4), the other end with get rid of piece swing member (5) and be connected.
3. the release starting mechanism of camshaft according to claim 1 and 2 is characterized in that, described through hole (1a) locates also to be provided with a separation sleeve (8), and the outer end thickness of separation sleeve (8) is than inner thicker.
4. the release starting mechanism of camshaft according to claim 2 is characterized in that, the described piece swing member (5) that gets rid of is " C " shape, and one of which end and gear (4) are rotationally connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204932670U CN202360171U (en) | 2011-12-01 | 2011-12-01 | Pressure relief start mechanism of camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204932670U CN202360171U (en) | 2011-12-01 | 2011-12-01 | Pressure relief start mechanism of camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202360171U true CN202360171U (en) | 2012-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204932670U Expired - Fee Related CN202360171U (en) | 2011-12-01 | 2011-12-01 | Pressure relief start mechanism of camshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202360171U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578572A (en) * | 2019-09-04 | 2019-12-17 | 天津内燃机研究所（天津摩托车技术中心） | Camshaft starting pressure reducing mechanism |
| CN113153480A (en) * | 2021-06-08 | 2021-07-23 | 含山县大颉机械有限公司 | Engine camshaft pressure reducing mechanism |
-
2011
- 2011-12-01 CN CN2011204932670U patent/CN202360171U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578572A (en) * | 2019-09-04 | 2019-12-17 | 天津内燃机研究所（天津摩托车技术中心） | Camshaft starting pressure reducing mechanism |
| CN113153480A (en) * | 2021-06-08 | 2021-07-23 | 含山县大颉机械有限公司 | Engine camshaft pressure reducing mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20151201 |
|
| EXPY | Termination of patent right or utility model |