CN104948249A - Valve clearance adjusting mechanism - Google Patents
Valve clearance adjusting mechanism Download PDFInfo
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- CN104948249A CN104948249A CN201510366569.4A CN201510366569A CN104948249A CN 104948249 A CN104948249 A CN 104948249A CN 201510366569 A CN201510366569 A CN 201510366569A CN 104948249 A CN104948249 A CN 104948249A
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- worm
- wheel shaft
- shaft
- worm gear
- worm wheel
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Abstract
The invention provides a valve clearance adjusting mechanism, and belongs to the technical field of engines. A worm is driven by a drive motor, and the middle of the worm is meshed with a worm wheel. The upper end of a push rod is movably connected with an adjusting screw, the adjusting screw is in threaded connection with a longitudinal hole in the tail of a swing arm, and the lower end of the push rod makes contact with the surface of a camshaft through a tappet. One end of a swing arm shaft is fixedly connected with the worm wheel and a worm wheel shaft I, the other end of the swing arm shaft is fixedly connected with worm wheel shaft outer edges and a worm wheel shaft II, the middle of the swing arm shaft is movably connected with a transverse hole in the middle of the swing arm, the circle centers of the worm wheel, the two worm wheel shafts and the worm wheel shaft outer edges are located on the same axis, the axis is parallel to the longitudinal axis of the swing arm shaft, and the eccentric distance is formed between the two axes. The worm wheel shaft I and a worm wheel shaft sleeve I are movably connected, and the worm wheel shaft II and a worm wheel shaft sleeve II are movably connected. The valve clearance adjusting mechanism can conduct automatic adjustment and allow valve clearances of an engine under various working conditions to be in an optimal state, the valve clearance adjusting mechanism can be applied to a valve mechanism composed of the camshaft, the swing arm and a valve, the original engine structure is slightly changed, and the economical efficiency and dynamic property of the engine can be effectively improved.
Description
Technical field
The invention belongs to engine valve actuating mechanism technical field, be specifically related to a kind of mechanism that automatically can regulate inlet and exhaust valve gap.
Background technique
Valve clearance is one of most important gap of engine reliable stable operation.During engine operation, the rising of Yin Wendu is expanded by valve.If between valve and driving component thereof when cold conditions gapless or gap too small, then under hot, valve and driving mechanism Expansion Potential thereof must cause valve-closing tight, cause valve blow-by, piston hits valve etc., even cannot start.If valve clearance is excessive, inlet and outlet door is opened delayed, and intake and exhaust time shorten, can reduce the actual Lift of valve, change normal port timing, and motor will be made because air inlet is not enough, exhaust is unclean and power drop.In addition, also make the shock of distribution device part increase, wearing and tearing are accelerated, and noise increases.The distribution situation of visible valve clearance to motor has a great impact, and can affect the performance of motor simultaneously.
Although variable valve actuating mechanism can improve the distribution situation of motor well, improve the performance of motor under different operating mode, but due to its structure relative complex, cost is higher, especially on the single cylinder engine that motorcycle is used, consider the pressure of cost and the income of user, make variable valve actuating mechanism this on automobile effective technology cannot promote the use of on motorcycle.Found by research, to the change of valve clearance, also can affect to some extent engine performance, different gaps, make motor completely different in the performance of basic, normal, high rotating speed, there is visibly different impact valve clearance on Engine torque, power and fuel consumption rate.Be exactly, within the engine during the slow-speed of revolution, should valve clearance be strengthened specifically, make power and moment of torsion increase to some extent, during high rotating speed, reduce valve clearance, keep charging efficiency, moment of torsion and power are promoted.And present stage major part motor valve clearance all need manual tune, and under working conditions of different engines, need the performance that different valve clearance guarantee motors had, therefore the mode of manual tune valve clearance can not meet the demands obviously.
Summary of the invention
The object of the present invention is to provide one can overcome prior art existing problems, change the inconvenience of manual tune valve clearance mode, by automatical control system for different operating mode timely adjustment valve clearance.
The present invention carries out improving original widely used to be driven again on the basis of the engine valve actuating mechanism of valve by camshaft actuated rocking arm, rocking arm.
The present invention is by rocking arm 1, bearing shell 2, pitman arm shaft 3, adjustment screw 4, locking nut 5, connecting groove 6, bearing 7, push rod 8, tappet 9, camshaft 10, worm screw 11, worm gear 12, supporting base 13, coupling 14, valve 15, drive motor 16, valve clearance 17, cylinder head 18, pin 19, worm-wheel shaft I 20, worm gear axle sleeve I 21, strut I 22, strut II 23, worm gear shaft sleeve II 24, worm-wheel shaft II 25, snap ring 26, key 27, worm-wheel shaft outer rim 28, oil leab II 29, oil leab I 30 forms, wherein worm screw 11 one end is affixed with the output shaft of drive motor 16 through coupling 14, worm screw 11 the other end is flexibly connected with supporting base 13 through bearing 7, engage with worm gear 12 in the middle part of worm screw 11.
Drive motor 16 is fixed in the boss of cylinder head 18; Supporting base 13 is fixed on the pitman arm shaft base in original cylinder head.
Push rod 8 upper end is flexibly connected through the lower end of connecting groove 6 with adjustment screw 4, and adjustment screw 4 is indulged hole 31 with the afterbody of rocking arm 1 and is threaded, and the afterbody of adjustment screw 4 head and rocking arm 1 is indulged between hole 31 and is equipped with locking nut 5; Push rod 8 lower end is through tappet 9 and camshaft 10 surface contact.
Worm-wheel shaft I 20 is affixed through locating stud 19 and pitman arm shaft 3 one end, worm-wheel shaft I 20 is simultaneously affixed with worm gear 12, worm-wheel shaft outer rim 28 is affixed through key 27 and pitman arm shaft 3 the other end, and worm-wheel shaft outer rim 28 is simultaneously affixed with worm-wheel shaft II 25, spacing by snap ring 26 outside worm-wheel shaft outer rim 28.
Rocking arm 1 is flexibly connected with the middle part cross-drilled hole 32 of pitman arm shaft 3 through bearing shell 2.
Strut I 22 upper end and worm gear axle sleeve I 21 lower end affixed, strut I 22 lower end and supporting base 13 affixed.
Worm-wheel shaft I 20 outer ring is flexibly connected with worm gear axle sleeve I 21 inner ring, and worm gear axle sleeve I 21 upper end is provided with oil leab I 30.
Strut II 23 upper end and worm gear shaft sleeve II 24 lower end affixed, strut II 23 lower end and supporting base 13 another side affixed.
Worm-wheel shaft II 25 outer ring is flexibly connected with worm gear shaft sleeve II 24 inner ring, and worm gear shaft sleeve II 24 upper end is provided with oil leab II 29.
The center of circle of worm gear 12, worm-wheel shaft I 20, worm-wheel shaft II 25 and worm-wheel shaft outer rim 28 is on same axis, and this axis and pitman arm shaft 3 longitudinal axes parallel, be provided with throw of eccentric d between two axis, and its value is 2-3mm.
Described rocking arm 1 afterbody is provided with vertical hole 31, is provided with cross-drilled hole 32 in the middle part of rocking arm 1, and rocking arm 1 head is provided with rocker head 33.
The performance of size on motor of valve clearance 17 has very large impact, and optimal valve gap 17 is different under different operating mode, the method of traditional manual tune valve clearance 17, according to different operating mode timely adjustment valve clearance 17, can not carry out research of the present invention to address this problem.
In mechanism, pitman arm shaft 3 is connected with rocking arm 1 by bearing shell 2, and rocking arm 1 can be rotated around pitman arm shaft 3; Pitman arm shaft 3 one end is affixed by locating stud 19 and worm-wheel shaft I 20, worm-wheel shaft outer rim 28 is affixed through key 27 and pitman arm shaft 3 the other end, spacing by snap ring 26 outside worm-wheel shaft outer rim 28, so just make pitman arm shaft 3 can not relative to worm gear 12 rotation, also can not relative to worm gear about 12 play.By this Placement, while pitman arm shaft 3 eccentric rotary, rotation being driven when worm gear 12 rotates, just make valve clearance 17 in change.Meanwhile worm-wheel shaft I 20, worm-wheel shaft II 25, rotation in worm gear axle sleeve I 21, worm gear shaft sleeve II 24, and have lubricant oil to be lubricated by oil leab I 30, oil leab II 29.
Motor 16 rotates and worm screw 11 can be driven to rotate, and worm screw 11 engages with worm gear 12, drives worm gear 12 to rotate when just enabling drive motor 16 rotate.
The present invention can valve gap adjustment automatically, and make motor all be in the optimum state in the valve clearance of each operating mode, the present invention can be applicable to the distribution device be made up of camshaft, rocking arm and valve, changes little, effectively can improve Economy and the power character of motor to original machine mechanism.
Accompanying drawing explanation
Fig. 1 is the plan view of valve clearance controlling mechanism
Fig. 2 is the side view of valve clearance controlling mechanism
Fig. 3 is the schematic diagram in A-A cross section in Fig. 2
Fig. 4 is the plan view of valve clearance controlling mechanism
Fig. 5 is rocker structure schematic diagram
Wherein: 1. rocking arm 2. bearing shell 3. pitman arm shaft 4. adjusts screw 5. locking nut 6. connecting groove 7. bearing 8. push rod 9. tappet 10. camshaft 11. worm screw 12. worm gear 13. supporting base 14. coupling 15. valve 16. drive motor 17. valve clearance 18. cylinder head 19. locating stud 20. worm-wheel shaft I 21. worm gear axle sleeve I 22. strut I 23. strut II 24. worm gear shaft sleeve II 25. worm-wheel shaft II 26. snap ring 27. key 28. worm-wheel shaft outer rim 29. oil leab II 30. oil leab I 31. vertical hole 32. cross-drilled hole 33. rocker head
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in more detail:
In the present invention, worm screw 11 one end is affixed with the output shaft of drive motor 16 through coupling 14, and worm screw 11 the other end is flexibly connected with supporting base 13 through bearing 7, engages in the middle part of worm screw 11 with worm gear 12.
Drive motor 16 is fixed in the boss of cylinder head 18; Supporting base 13 is fixed on the pitman arm shaft base in original cylinder head.
Push rod 8 upper end is flexibly connected through the lower end of connecting groove 6 with adjustment screw 4, and adjustment screw 4 is indulged hole 31 with the afterbody of rocking arm 1 and is threaded, and the afterbody of adjustment screw 4 head and rocking arm 1 is indulged between hole 31 and is equipped with locking nut 5; Push rod 8 lower end is through tappet 9 and camshaft 10 surface contact.
Worm-wheel shaft I 20 is affixed through locating stud 19 and pitman arm shaft 3 one end, and worm-wheel shaft I 20 is simultaneously affixed with worm gear 12.
Worm-wheel shaft outer rim 28 is affixed through key 27 and pitman arm shaft 3 the other end, and worm-wheel shaft outer rim 28 is simultaneously affixed with worm-wheel shaft II 25, spacing by snap ring 26 outside worm-wheel shaft outer rim 28.
Rocking arm 1 is flexibly connected with the middle part cross-drilled hole 32 of pitman arm shaft 3 through bearing shell 2.
Strut I 22 upper end and worm gear axle sleeve I 21 lower end affixed, strut I 22 lower end and supporting base 13 affixed.
Worm-wheel shaft I 20 outer ring is flexibly connected with worm gear axle sleeve I 21 inner ring, and worm gear axle sleeve I 21 upper end is provided with oil leab I 30.
Strut II 23 upper end and worm gear shaft sleeve II 24 lower end affixed, strut II 23 lower end and supporting base 13 another side affixed.
Worm-wheel shaft II 25 outer ring is flexibly connected with worm gear shaft sleeve II 24 inner ring, and worm gear shaft sleeve II 24 upper end is provided with oil leab II 29.
The center of circle of worm gear 12, worm-wheel shaft I 20, worm-wheel shaft II 25 and worm-wheel shaft outer rim 28 is on same axis, and this axis and pitman arm shaft 3 longitudinal axes parallel, be provided with throw of eccentric d between two axis, and its value is 2-3mm.
Described rocking arm 1 afterbody is provided with vertical hole 31, is provided with cross-drilled hole 32 in the middle part of rocking arm 1, and rocking arm 1 head is provided with rocker head 33.
Pitman arm shaft 3 is connected with rocking arm 1 by bearing shell 2 in the present invention, and rocking arm 1 can be rotated around pitman arm shaft 3; Pitman arm shaft 3 one end is affixed by locating stud 19 and worm-wheel shaft I 20, worm-wheel shaft outer rim 28 is affixed through key 27 and pitman arm shaft 3 the other end, spacing by snap ring 26 outside worm-wheel shaft outer rim 28, so just make pitman arm shaft 3 can not relative to worm gear 12 rotation, also can not relative to worm gear about 12 play.By this Placement, while pitman arm shaft 3 eccentric rotary, rotation being driven when worm gear 12 rotates, just make valve clearance 17 in change.Meanwhile worm-wheel shaft I 20, worm-wheel shaft II 25, rotation in worm gear axle sleeve I 21, worm gear shaft sleeve II 24, and have lubricant oil to be lubricated by oil leab I 30, oil leab II 29.
Motor 16 rotates and worm screw 11 can be driven to rotate, and worm screw 11 engages with worm gear 12, drives worm gear 12 to rotate when just enabling drive motor 16 rotate.
As shown in Figure 1, when the engine runs, camshaft 10 rotation forces push rod 8, drives rocking arm 1 to-and-fro motion to control the opening and closing of valve 15 through driving mechanism to overall structure of the present invention.But optimal valve gap 17 is different when different operating mode, therefore need to regulate, concrete regulative mode is as follows in good time.
Pitman arm shaft 3 is connected with rocking arm 1 by bearing shell 2 through rocking arm 1, and rocking arm 1 can rotate around pitman arm shaft 3; Pitman arm shaft 3 one end is affixed through locating stud 19 and worm-wheel shaft I 20, and is interference fit.Pitman arm shaft 3 the other end is affixed with worm-wheel shaft II 25 through snap ring 26, key 27.Worm gear 12 and worm-wheel shaft I 20 are one and are concentric, and worm-wheel shaft II 25 and worm-wheel shaft outer rim 28 are one and are concentric.So just make pitman arm shaft 3 can not relative to worm gear 12 rotation, also can not relative to worm gear about 12 play.The longitudinal axis of worm-wheel shaft I 20, worm-wheel shaft II 25, worm-wheel shaft outer rim 28 is same lines, throw of eccentric is provided with between the longitudinal axis of the longitudinal axis of worm gear 12 pitman arm shaft 3 and worm-wheel shaft I 20, worm-wheel shaft II 25, worm gear 12, thus can drive pitman arm shaft 3 eccentric rotary time worm gear 12 rotates, while rotation, just make valve clearance 17 in change.Meanwhile worm-wheel shaft I 20 and worm-wheel shaft II 25 rotation in worm gear axle sleeve I 21 and worm gear shaft sleeve II 24 respectively, and have lubricant oil to lubricate respectively by oil leab I 30 and oil leab II 29.Drive motor 16 is fixed on the boss of cylinder head 18.Drive motor 16 output terminal is connected by coupling 14 with worm screw 11, and drive motor 16 rotates and worm screw 11 can be driven to rotate, and engages, drive worm gear 12 to rotate when just enabling drive motor 16 rotate in the middle part of worm screw 11 with worm gear 12.
In the present invention, the expansion helix angle of worm screw 11 is less than the friction angle of worm and gear contact, this just makes this Worm and worm-wheel gearing have auto-lock function, namely can only by worm screw 11 rotary actuation worm gear 12, worm screw 11 can not be driven when worm gear 12 rotates, when drive motor 16 does not work, worm gear 12 would not rotate because of the interference of the ambient conditionss such as vibrations.Control for drive motor 16 is Pulse Width Control, can control the angle of drive motor 16 rotation by applying pulse.And in the present invention, worm gear 12 only have part range to have tooth, by structure, we can find out, the change degree of the larger then valve clearance 17 of angle that worm gear 12 rotates is large, excessive in order to prevent from making when drive motor 16 runs shakiness worm gear 12 angle of swing too much to cause valve clearance 17 to change, thus while guarantee meets valve clearance 17 regulation range worm gear 12 on setting unit tooth.When installing pitman arm shaft 3 and worm gear 12, because pitman arm shaft 3 and worm-wheel shaft II 25 are fixed by locating stud 19, so their relative position is determined, a locating point drawn by worm gear 12, supporting base 13 is also drawn a locating point, make two locating point alignment during installation, at this moment valve clearance 17 is maximum, the initial position of this Ye Shi mechanism.When each engine restart, all allow drive motor 16 angle of swing get back to initial position, then ECU is again according to engine operating condition parameter, controls the angle of swing of drive motor 16, implements closed loop control, and then reaches the object of valve gap adjustment 17.When worm gear 12 rotates, pitman arm shaft 3 can be driven to carry out circular movement around the center of circle of worm gear 12, now, pitman arm shaft 3 drive rocking arm 1 above-below direction motion, when moving upward, rocker head 33 is away from valve, just increases valve clearance 17; When moving downward, rocker head 33 is close to valve, just reduces valve clearance 17.During pitman arm shaft 3 eccentric rotary, rocking arm 1 is except moving up and down, also have side-to-side movement by a small margin, because screw thread is fixed in the adjustment screw 4 that hole 31 is indulged in rocking arm 1 rear end, its lower end is spherical, embed in the connecting groove 6 of push rod 8 upper end, this kind of Placement just allows adjustment screw 4 to be unlikely to moving among a small circle to depart from push rod 8.Meanwhile, rocker head 33 also can at left and right directions experiencing small oscillating movements, and because amplitude is less, it still effectively can drive valve after left and right directions position changes.By the demarcation to valve clearance under Under Different Work Condition of Engine 17, specify the numerical values recited of valve clearance 17 during different operating mode, and then know that worm gear 12 should rotate much angles and valve clearance 17 just can be made to reach this numerical value, thus just know how drive motor 16 is controlled, worm screw 11, worm gear 12 is driven again by drive motor 16, worm gear 12 turns an angle and drives pitman arm shaft 3 circular movement, and then particular value has been adjusted in valve clearance, so just achieve the object controlling valve clearance 17 in real time.In Fig. 1, pitman arm shaft 3 is the valve clearancies 17 when being in peak, is valve clearance 17 maximum value; When worm screw 11 rotarily drive worm gear 12 turn clockwise time, valve clearance 17 can reduce, and when reaching the edge of the tooth on worm gear 12, valve clearance 17 is minimum.By controlling the angle of swing of drive motor 16, can valve clearance 17 value be adjusted to minimum arrive maximum between.
Claims (2)
1. a valve clearance controlling mechanism, by rocking arm (1), bearing shell (2), pitman arm shaft (3), adjustment screw (4), locking nut (5), connecting groove (6), bearing (7), push rod (8), tappet (9), camshaft (10), worm screw (11), worm gear (12), supporting base (13), coupling (14), valve (15), drive motor (16), valve clearance (17), cylinder head (18), locating stud (19), worm-wheel shaft I (20), worm gear axle sleeve I (21), strut I (22), strut II (23), worm gear shaft sleeve II (24), worm-wheel shaft II (25), snap ring (26), key (27), worm-wheel shaft outer rim (28), oil leab II (29), oil leab I (30) forms, it is characterized in that wherein worm screw (11) one end is affixed with the output shaft of drive motor (16) through coupling (14), worm screw (11) the other end is flexibly connected with supporting base (13) through bearing (7), and worm screw (11) middle part is engaged with worm gear (12), drive motor (16) is fixed in the boss of cylinder head (18), push rod (8) upper end is flexibly connected through the lower end of connecting groove (6) with adjustment screw (4), adjustment screw (4) is indulged hole (31) with the afterbody of rocking arm (1) and is threaded, and the afterbody of adjustment screw (4) head and rocking arm (1) is indulged between hole (31) and is equipped with locking nut (5), push rod (8) lower end is through tappet (9) and camshaft (10) surface contact, worm-wheel shaft I (20) is affixed through locating stud (19) and pitman arm shaft (3) one end, worm-wheel shaft I (20) is simultaneously affixed with worm gear (12), worm-wheel shaft outer rim (28) is affixed through key (27) and pitman arm shaft (3) the other end, worm-wheel shaft outer rim (28) is simultaneously affixed with worm-wheel shaft II (25), and worm-wheel shaft outer rim (28) outside is spacing by snap ring (26), rocking arm (1) is flexibly connected with the middle part cross-drilled hole (32) of pitman arm shaft (3) through bearing shell (2), strut I (22) upper end and worm gear axle sleeve I (21) lower end affixed, strut I (22) lower end and supporting base (13) affixed, worm-wheel shaft I (20) outer ring is flexibly connected with worm gear axle sleeve I (21) inner ring, and worm gear axle sleeve I (21) upper end is provided with oil leab I (30), strut II (23) upper end and worm gear shaft sleeve II (24) lower end affixed, strut II (23) lower end and supporting base (13) another side affixed, worm-wheel shaft II (25) outer ring is flexibly connected with worm gear shaft sleeve II (24) inner ring, and worm gear shaft sleeve II (24) upper end is provided with oil leab II (29), the center of circle of worm gear (12), worm-wheel shaft I (20), worm-wheel shaft II (25) and worm-wheel shaft outer rim (28) is on same axis, this axis and pitman arm shaft (3) longitudinal axes parallel, be provided with throw of eccentric d between two axis, its value is 2-3mm.
2. by valve clearance according to claim 1 controlling mechanism, it is characterized in that described rocking arm (1) afterbody is provided with vertical hole (31); rocking arm (1) middle part is provided with cross-drilled hole (32), and rocking arm (1) head is provided with rocker head (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510366569.4A CN104948249B (en) | 2015-06-27 | 2015-06-27 | Valve clearance governor motion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510366569.4A CN104948249B (en) | 2015-06-27 | 2015-06-27 | Valve clearance governor motion |
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| Publication Number | Publication Date |
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| CN104948249A true CN104948249A (en) | 2015-09-30 |
| CN104948249B CN104948249B (en) | 2017-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510366569.4A Active CN104948249B (en) | 2015-06-27 | 2015-06-27 | Valve clearance governor motion |
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| Country | Link |
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| CN (1) | CN104948249B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545401A (en) * | 2015-12-14 | 2016-05-04 | 中国北方发动机研究所(天津) | Valve timing adjusting device for double overhead camshaft of high-speed diesel engine |
| CN109319156A (en) * | 2018-10-30 | 2019-02-12 | 西安爱生技术集团公司 | A kind of Contactless controlling device of unmanned vehicle engine breather valve |
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| CN109319156A (en) * | 2018-10-30 | 2019-02-12 | 西安爱生技术集团公司 | A kind of Contactless controlling device of unmanned vehicle engine breather valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104948249B (en) | 2017-11-21 |
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