CN203847191U - Engine variable valve driving mechanism - Google Patents
Engine variable valve driving mechanism Download PDFInfo
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- CN203847191U CN203847191U CN201420181696.8U CN201420181696U CN203847191U CN 203847191 U CN203847191 U CN 203847191U CN 201420181696 U CN201420181696 U CN 201420181696U CN 203847191 U CN203847191 U CN 203847191U
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- valve
- driven plunger
- casing
- driving mechanism
- hole
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Abstract
A engine variable air valve driving mechanism comprises a box body, wherein a driving piston hole is formed in the box body, a driving piston is arranged in the driving piston hole, an air valve rod positioning hole is formed in the box wall on one side of the box body, the axial direction of the air valve rod positioning hole is intersected with the axial direction of the driving piston hole, and a gap is formed in the side of the piston and faces the air valve rod positioning hole. The engine variable valve driving mechanism utilizes a valve rod of an air valve to position the box body, utilizes the gap in the side of the driving piston in the box body to eliminate or establish solid connection of a cam and the air valve and is simple in structure, an auxiliary air valve motion device is simplified, the engine weight and height are decreased, the running reliability and durability of an engine are improved, and the problems of complicated system, heavy mechanism, large occupied space, difficult manufacture and high cost in the prior art are solved. Due to the fact that the cam and the air valve are in solid connection, the shortcomings including hydraulic connection deformation, leakage, overloading, poor reliability and the like are overcome.
Description
Technical field:
The utility model relates to mechanical field, relates in particular to the valve actuation field of vehicle motor, particularly a kind of engine variable-valve driving mechanism.
Background technique:
The effect of engine variable-valve driving mechanism is a lot, and one of them is on the basis of normal engine valve movement, produces auxiliary valve motion.The auxiliary valve motion of motor can be for the discarded recirculation of motor, opening and closing and the auxiliary valve motion etc. of motor.In prior art, the structure of engine variable-valve driving mechanism is comparatively complicated, and weight is large, takes up room many, and manufacture difficulty is high.
Summary of the invention:
The purpose of this utility model is to provide a kind of engine variable-valve driving mechanism, and described this engine variable-valve driving mechanism will solve engine variable-valve driving mechanism structure complexity in prior art, weight is large, the technical problem many, manufacture difficulty is high takes up room.
This engine variable-valve driving mechanism of the present utility model comprises a casing, wherein, in described casing, be provided with a driven plunger hole, in described driven plunger hole, be provided with a driven plunger, in one side box wall of casing, be provided with a valve stem positioning hole, described valve stem positioning hole axially and driven plunger hole axial crossing, in the side of described driven plunger, be provided with a breach, described breach is towards valve stem positioning hole.
Further, described casing is arranged in the valve actuation chain of motor, described valve actuation chain comprises cam and valve, casing is between described cam and valve, valve contains valve rod, casing is socketed on described valve rod by described valve stem positioning hole, between casing and valve rod, be provided with along stem shaft to sliding pair, the moving direction of driven plunger in driven plunger hole is vertical or approaching vertical with the moving direction of valve rod, relative position between position control driving piston and the valve rod of driven plunger in driven plunger hole, in the time that the space between driven plunger and valve rod is zero, cam passes through casing, driven plunger and valve rod and valve form rigid solid link structure, the described rigid solid link structure that moves through of cam passes to valve.
Further, described valve actuation chain also comprises rocking arm, and the middle part of described rocking arm is placed on a pitman arm shaft; one end of rocking arm contacts with cam; the other end of rocking arm is connected with casing, and rocking arm contains oil supply gallery, and described oil supply gallery is communicated with the driven plunger hole in casing.
Further, the one end in driven plunger hole is provided with spring seat, between described spring seat and driven plunger, is provided with return spring.
Further, described breach is made up of to the bathtub construction of the axis direction incision of driven plunger a side from driven plunger, described bathtub construction includes at least one bottom surface, described bottom surface is crossing with the central axis of driven plunger, and crossing angle is less than or equal to the friction self-locking angle of driven plunger and casing.
Or described breach is made up of to the annular groove of the axis direction incision of brake piston a side from driven plunger, described annular groove includes at least one bottom surface, and at least one described bottom surface is parallel with the central axis of driven plunger.
Further, in described bottom surface, include two step type plane or cylinders that are parallel to each other.
Further, on described cam, contain conventional boss and at least one auxiliary boss of an increasing, the conventional valve of the increasing that the conventional boss of described increasing generates rises curve and is made up of bottom and top, the Auxiliary valves that described bottom and described auxiliary boss generate rises curve and approaches with high, and described top is basic identical with the conventional valve liter that the conventional engine boss that there is no auxiliary valve motion generates.
Further, between valve and casing, be provided with a preloading spring.
Further, the central authorities of described preloading spring are provided with a through hole, include the flat spring of more than two number radially extending in preloading spring, and described through hole is enclosed within on valve rod, and described flat spring is all placed on the spring seat of valve.
Working principle of the present utility model is: in the time of needs auxiliary valve motion, control mechanism is opened to driven plunger hole fuel feeding, oil pressure overcomes the active force of return spring, driven plunger is moved on to operating position from off position in driven plunger hole, eliminate the space between driven plunger and valve, cam links by the solid forming between variable valve actuation and valve, will on cam, the motion of auxiliary boss pass to valve, produces auxiliary valve motion.In the time not needing auxiliary valve motion, control mechanism cuts out emptying, return spring back into off position by driven plunger from operating position, between driven plunger and valve, form space, by the motion skip of auxiliary boss on cam (motion is lost), eliminate and produce auxiliary valve motion, motor is got back to the conventional valve motion of fired state.
The utility model is compared with prior art, and its effect is actively with obvious.The utility model utilizes the valve rod location casing of valve, utilize the gap position elimination of driven plunger side in casing or set up cam and link with the solid between valve, compact structure, simplify auxiliary valve motion device, weight and the height of motor are reduced, increase reliability and the durability of engine operation, solved the system complex, the mechanism's heaviness that exist in prior art, take large quantity space and manufactured the technical problem difficult, cost is high.In addition, what variable valve actuation of the present utility model adopted is solid link, has eliminated the shortcoming such as distortion, leakage, overload and poor reliability of hydraulic connecting.
Brief description of the drawings:
Fig. 1 be first embodiment of engine variable-valve driving mechanism of the present utility model in auxiliary valve motion the schematic diagram in " pass " (not operation) position.
Fig. 2 be first embodiment of engine variable-valve driving mechanism of the present utility model in auxiliary valve motion the schematic diagram in " opening " (operation) position.
Fig. 3 be second embodiment of engine variable-valve driving mechanism of the present utility model in auxiliary valve motion the schematic diagram in " pass " (not operation) position.
Fig. 4 be second embodiment of engine variable-valve driving mechanism of the present utility model in auxiliary valve motion the schematic diagram in " opening " (operation) position.
Fig. 5 be the 3rd embodiment of engine variable-valve driving mechanism of the present utility model in auxiliary valve motion the schematic diagram in " pass " (not operation) position.
Fig. 6 be the 3rd embodiment of engine variable-valve driving mechanism of the present utility model in auxiliary valve motion the schematic diagram in " opening " (operation) position.
Embodiment:
Embodiment 1:
As depicted in figs. 1 and 2, first embodiment of engine variable-valve driving mechanism of the present utility model is respectively in its " pass " (not operation) and " opening " (operation) position.In Fig. 1 and Fig. 2, comprise respectively three chief components: valve actuator 200, valve mechanism 300 and engine variable-valve driving mechanism 100.Valve actuator 200 and valve mechanism 300 are two assemblies of valve actuation chain.
The valve actuator 200 of the present embodiment only includes a cam 230, and cam 230 has an increasing boss 220 that is mainly used in the conventional running of motor on interior basic circle 225, strengthens boss 220 larger than conventional boss (not being with auxiliary valve motion).The reason strengthening is that operation of cam and conventional cam integrate, and the cam 230 after integrated is also with the small boss 232 and 233 that is useful on auxiliary valve motion.In the time that engine ignition operates, in order to skip auxiliary small boss 232 and 233, the bottom of strengthening boss 220 must increase the transition portion approximately contour with small boss 232 and 233, and its top is equivalent to conventional boss.Auxiliary small boss 232 can be used for EGR, and auxiliary 233 of small boss can be used for compressing releasing brake.
The valve mechanism 300 of the present embodiment only includes a valve 3001.Valve 3001 on the valve seat 320 in engine cylinder-body 500, stops gas flowing between engine cylinder (under valve, not showing) and gas exhaust manifold 600 by valve spring 3101 overheads by spring seat 302.For the conventional engine that there is no auxiliary valve motion, the mechanical motion of conventional cam (not auxiliary boss) will be directly passed to valve 3001, and it is is periodically opened and closed.Here shown is a cylinder of motor, but in actual use, motor also can have plural cylinder.
Variable valve actuation 100 is between cam 230 and valve 3001.Variable valve actuation 100 comprises that the positioning hole 191 on the casing 125(casing 125 of being located by valve stem 301 is directly enclosed within above valve stem 301), in casing 125, be provided with a driven plunger hole 190, be provided with a driven plunger 160 driven plunger hole 190 inner sliding types, driven plunger 160 is positioned at the top of valve stem 301 and along (be here level) direction motion vertical with valve motion direction, controls the space 134(Fig. 1 between driven plunger 160 and valve stem 301).In the time that the space between driven plunger 160 and valve stem 301 is zero (Fig. 2), cam 230 links by the solid that forms rigidity between described variable valve actuation 100 and valve 3001, and the motion of cam 230 is passed to valve 3001.In the driven plunger 160 here, have two step cylndrical surface: small cylindrical surface 140(Fig. 2) and the great circle cylinder that coordinates with driven plunger hole 190.Distance between large and small two cylndrical surface is more than or equal to space 134(Fig. 1).Certainly, driven plunger 160 also can replace step cylndrical surface with step plane, and step plane can be the bottom surface (valve stem 301 is positioned at this guiding groove) of the guiding groove on driven plunger 160.In addition, the step surface in driven plunger 160 can be more than two.
Between casing 125 and cotter seat 302, be provided with preloading spring 198.Preloading spring 198 is upwards biased in whole variable valve actuation 100 on cam 230, and the driven plunger 160 in piston hole 190 is not subject to the effect of preloading spring 198 like this.The preloading spring 198 is here a centrosymmetric compressing tablet spring, (such as six of more than two flat springs that there is a through hole in its central authorities contains radially arrangement, be the radial of sun formula), center through hole is enclosed within on valve stem 301, and described plural flat spring is placed on the spring seat 302 of valve.Preloading spring 198 can be also the spring of other form, but its effect is all to eliminate not following and impacting of the valve actuation chain inside of causing due to space 134.
In the time of needs auxiliary valve motion, control mechanism 50 is opened fuel feeding ("+" mark of Fig. 2), and the machine oil of motor, by fluid passage (comprising the fluid passage 410 in casing), enters in driven plunger hole 190.Oil pressure overcomes the active force of return spring 156, pushes driven plunger 160 to operating position from off position, makes the space 134(Fig. 1 between driven plunger 160 and valve stem 310) be eliminated (Fig. 2).Cam 230 links by the solid that forms rigidity between variable valve actuation 100 and valve 3001, and cam 230(is comprised and strengthens boss 220, auxiliary small boss 232 and 233) motion pass to valve 3001, produce auxiliary valve motion.
In the time not needing auxiliary valve motion, control mechanism 50 cuts out emptying (the "-" mark of Fig. 1), driven plunger 160 is got back to off position from operating position under the effect of return spring 156, the space 134 of valve actuation chain inside forms (Fig. 1) again, the motion of auxiliary small boss 232 and 233 is skipped, can not be delivered to valve 3001(and only have the motion of casing 125, apneustic 3001 motion), the auxiliary valve motion of motor is disengaged.Only have the motion that strengthens boss 220 tops to be delivered to valve 3001, produce the conventional valve motion of engine ignition running.
Embodiment 2:
As shown in Figure 3 and Figure 4, second of engine variable-valve driving mechanism of the present utility model embodiment is respectively in its " pass " (not operation) and " opening " (operation) position.Compared with first embodiment, the valve actuator 200 of the present embodiment also comprises rocking arm 210, that is to say that the valve actuation chain of the present embodiment has increased rocking arm 210 these assemblies.The centre of rocking arm 210 is placed on pitman arm shaft 205, and one end of rocking arm contacts with cam 230 by roller 235, and the other end of rocking arm 210 is positioned on casing 125 by valve clearance controlling mechanism.Valve clearance controlling mechanism comprises by nut 105 and is fixed tightly in and resembles foot pad 114 below adjusting screw 110 on rocking arm 210 and adjusting screw pressure ball.So the engine variable-valve driving mechanism 100 of the present embodiment is between rocking arm 210 and valve mechanism 300.
Variable valve actuation 100 and first embodiment of the present embodiment are also different, wherein the driven plunger hole 190 in casing 125 tilts (tilt angle is less than or equal to friction self-locking angle) a little with substantially horizontal, so the moving direction of the driven plunger 160 in driven plunger hole 190 is not completely vertical with valve motion direction.In driven plunger 160, there is a plane 147 tilting with its axis, be positioned on valve stem 301.Driven plunger 160 tilt driven plunger hole 190 in motion control plane 147 and the space 134(Fig. 3 between valve stem 301).Preloading spring 198 is setovered casing 125 upwards, pads 114 near the foot that resembles on rocking arm 210.
In the time of needs auxiliary valve motion, control mechanism 50 is opened fuel feeding ("+" mark in Fig. 4 oil supply gallery 211), the machine oil of motor is by the oil supply gallery 211,212,213,214 in pitman arm shaft 205 and rocking arm 210 and the oil supply gallery 115 in adjusting screw, oil supply gallery 410 in casing 125, and oil groove 137 and oil supply gallery 152 in driven plunger 160, enter in driven plunger hole 190.Oil pressure overcomes the active force of return spring 156, pushes driven plunger 160 to operating position from off position, makes the space 134(Fig. 3 between driven plunger 160 and valve stem 310) be eliminated (Fig. 4).Cam 230 link by the rigid solid forming between variable valve actuation 100 and valve 3001, cam 230(is comprised strengthen boss 220, assist boss 232 and 233) motion pass to valve 3001, generation auxiliary valve motion.
In the time not needing auxiliary valve motion, control mechanism 50 cuts out and emptying (the "-" mark in Fig. 3 oil supply gallery 211), driven plunger 160 is got back to off position from operating position under the effect of return spring 156, the space 134 of valve actuation chain inside forms (Fig. 3) again, the motion of auxiliary boss 232 and 233 is skipped, can not be delivered to valve 3001(and only have the motion of casing 125, apneustic 3001 motion), the operation running of motor is disengaged.Only have the motion that strengthens boss 220 tops to be delivered to valve 3001, produce the conventional valve motion of engine ignition running.
Embodiment 3:
As shown in Figure 5 and Figure 6, the 3rd of engine variable-valve driving mechanism of the present utility model the embodiment is respectively in its " pass " (not operation) and " opening " (operation) position.Unique difference of the present embodiment and second embodiment is in driven plunger 160, to have two planes 140 and 141 that tilt with its axis.Because plane 140 and 141 is formed with the step of a discrepancy in elevation, driven plunger 160 moves to space 134(that off position (Fig. 5) forms with reference to figure 3 and Fig. 4 from operating position (Fig. 6)) will be the discrepancy in elevation of two step surfaces 140 and 141 and the summation of driven plunger 160 banking motions.That is to say, the 3rd embodiment is the comprehensive of first embodiment and second embodiment substantially.Certainly, the step plane 140 and 141 here can be also the bottom surface (valve stem 301 is positioned at this guiding groove) of the guiding groove on driven plunger 160, and can be plural step surface.
Above-mentioned many embodiments, should not be regarded as the restriction to the utility model scope, but as representing concrete illustrations more of the present utility model, many other develop all and likely therefrom produce.For instance, the auxiliary valve motion apparatus and method that the utility model proposes, not only can, for overhead camshaft type engine, also be applicable to push rod engine; Not only can produce compression-release auxiliary valve motion (comprise band and be not with exhaust gas recirculatioon), also can produce the type auxiliary valve motion of losing heart (comprise partial periodicity and complete period lose heart type auxiliary valve motion).
In addition, the form of return spring and preloading spring and arrangement can be also varied.
Further, the form of driven plunger also can be different, and the step surface above piston, quantity and the shape etc. on inclined-plane also can be different.
In addition, the quantity of cam convex platform and shape also can change as required.
Therefore, scope of the present utility model should not decided by above-mentioned concrete illustration, but is decided by claim.
Claims (10)
1. an engine variable-valve driving mechanism, comprise a casing, it is characterized in that: in described casing, be provided with a driven plunger hole, in described driven plunger hole, be provided with a driven plunger, in one side box wall of casing, be provided with a valve stem positioning hole, described valve stem positioning hole axially and driven plunger hole axial crossing, in the side of described driven plunger, be provided with a breach, described breach is towards valve stem positioning hole.
2. engine variable-valve driving mechanism as claimed in claim 1, it is characterized in that: described casing is arranged in the valve actuation chain of motor, described valve actuation chain comprises cam and valve, casing is between described cam and valve, valve contains valve rod, casing is socketed on described valve rod by described valve stem positioning hole, between casing and valve rod, be provided with along stem shaft to sliding pair, the moving direction of driven plunger in driven plunger hole is vertical or approaching vertical with the moving direction of valve rod, relative position between position control driving piston and the valve rod of driven plunger in driven plunger hole, in the time that the space between driven plunger and valve rod is zero, cam passes through casing, driven plunger and valve rod and valve form rigid solid link structure, the described rigid solid link structure that moves through of cam passes to valve.
3. engine variable-valve driving mechanism as claimed in claim 2, it is characterized in that: described valve actuation chain also comprises rocking arm, the middle part of described rocking arm is placed on a pitman arm shaft; one end of rocking arm contacts with cam; the other end of rocking arm is connected with casing; rocking arm contains oil supply gallery, and described oil supply gallery is communicated with the driven plunger hole in casing.
4. engine variable-valve driving mechanism as claimed in claim 2, is characterized in that: the one end in driven plunger hole is provided with spring seat, between described spring seat and driven plunger, is provided with return spring.
5. engine variable-valve driving mechanism as claimed in claim 1, it is characterized in that: described breach is made up of to the bathtub construction of the axis direction incision of driven plunger a side from driven plunger, described bathtub construction includes at least one bottom surface, described bottom surface is crossing with the central axis of driven plunger, and crossing angle is less than or equal to the friction self-locking angle of driven plunger and casing.
6. engine variable-valve driving mechanism as claimed in claim 1, it is characterized in that: described breach is made up of to the annular groove of the axis direction incision of brake piston a side from driven plunger, described annular groove includes at least one bottom surface, and at least one described bottom surface is parallel with the central axis of driven plunger.
7. the engine variable-valve driving mechanism as described in claim 5 or 6, is characterized in that: in described bottom surface, include two step type plane or cylinders that are parallel to each other.
8. engine variable-valve driving mechanism as claimed in claim 2, it is characterized in that: conventional boss and at least one auxiliary boss of on described cam, containing an increasing, the conventional valve of the increasing that the conventional boss of described increasing generates rises curve and is made up of bottom and top, the Auxiliary valves that described bottom and described auxiliary boss generate rises curve and approaches with high, and described top is basic identical with the conventional valve liter that the conventional engine boss that there is no auxiliary valve motion generates.
9. engine variable-valve driving mechanism as claimed in claim 2, is characterized in that: between valve and casing, be provided with a preloading spring.
10. engine variable-valve driving mechanism as claimed in claim 9, it is characterized in that: the central authorities of described preloading spring are provided with a through hole, in preloading spring, include the flat spring of more than two number radially extending, described through hole is enclosed within on valve rod, and described flat spring is all placed on the spring seat of valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181696.8U CN203847191U (en) | 2014-04-15 | 2014-04-15 | Engine variable valve driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181696.8U CN203847191U (en) | 2014-04-15 | 2014-04-15 | Engine variable valve driving mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203847191U true CN203847191U (en) | 2014-09-24 |
Family
ID=51560223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420181696.8U Expired - Fee Related CN203847191U (en) | 2014-04-15 | 2014-04-15 | Engine variable valve driving mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203847191U (en) |
-
2014
- 2014-04-15 CN CN201420181696.8U patent/CN203847191U/en not_active Expired - Fee Related
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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: 20140924 Termination date: 20210415 |
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| CF01 | Termination of patent right due to non-payment of annual fee |