CN102678215A

CN102678215A - Simplifying mechanism of fully variable valve timing gear

Info

Publication number: CN102678215A
Application number: CN2011100541973A
Authority: CN
Inventors: 朱譞晟
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-08
Filing date: 2011-03-08
Publication date: 2012-09-19

Abstract

The invention discloses a simplifying mechanism of a fully variable valve timing gear, belonging to the technique in the field of valve control of a combustion motor. The technique can be used for controlling stroke of reciprocating motion and also can be applied to technical field of other machines of which reciprocating motion strokes need to be controlled. The cost rises, the reliability drops and the application of the fully variable valve timing gear in the field of valve control of the combustion motor is restricted caused by the complexity of the fully variable valve timing gear; and meanwhile the lift range can be adjusted by an intake valve, so that the invention provides a mechanism for driving four valves by drive combination of the fully variable valve timing gear; two sets of the fully variable valve timing gears are utilized; two valves are driven by each fully variable valve timing gear through a middle body, and the two sets of fully variable valve timing gears share a control mechanism and a cam shaft. According to the simplifying mechanism of the fully variable valve timing gear disclosed by the invention, the condition that the lasting opening time of the intake valve can be adjusted is achieved, no harmful effect is generated between the intake valve and an exhaust valve, and the mechanism is relatively simple.

Description

Simplifying the internal structure of an organization of full VVT gear

Technical field

The invention of this reality relates to simplifying the internal structure of an organization of a kind of full VVT gear; The technology that belongs to engine valve control field; This technology makes this technology also can be applicable to the field of mechanical technique that other need control the to-and-fro motion stroke for reciprocating Stroke Control.

Background technique

Full VVT gear; For example publication number is the full VVT gear of burn engine within CN101858233 comprises shown in complete variable gas method in correct time and the mechanism of speed-changing swing mechanism; The lasting opening time of valve changed continuously when the purpose of design was; Keep valve lift constant simultaneously, when fully satisfying the high rotating speed of internal-combustion engine to the needs of valve timing.But the characteristic of this type of mechanism is more complicated more than common cam shaft system, because in order to reduce manufacture cost, simplified structure improves reliability, need carry out suitable simplification to it.

In addition; The beneficial effect that the intake valve lift is adjustable is the pumping loss that can reduce internal-combustion engine; Application number is for independently adjustable continuous variable valve correct time and lift mechanisms can be accomplished the approximate independent regulation in lift and correct time; Therefore but have various structure with above-mentioned full VVT gear, if desired high simplified the time, how the two is comprehensively driven the method that intake valve and exhaust valve do not have solution as yet respectively in a driving mechanism.

Summary of the invention

To above problem; The present invention provides a kind of like this method for simplifying of full VVT gear; On the basis of existing full VVT gear, use the full VVT gear of two covers, the position is in the same side of cylinder; Drive two valves through an intermediate separately, and two cover shared control mechanism of full VVT gear and camshafts.The valve that one of them mechanism drives offside is the driving mechanism of simplifying through transmission system drives.The geometric properties of said cam and control mechanism can be different, and its concrete characteristic is the timing events that adapts to two valves of a side of being controlled, and promptly adheres to the cam and the control mechanism nonjoinder of the full VVT gear of two covers separately.

Description of drawings

Fig. 1 is the schematic representation of driving mechanism.Show the structure that constitutes the mechanism that drives four valves according to existing full VVT gear.

Fig. 2 is the schematic representation of driving mechanism, shows the mechanism's common cam shaft and the control mechanism that drive intake valve and exhaust valve.

Fig. 3 is the schematic representation of driving mechanism, shows speed change fork that drives exhaust valve and the shared stationary axle of speed change fork that drives intake valve.

Embodiment

The present invention is further specified through exemplary embodiments below in conjunction with accompanying drawing.According to the full VVT gear described in the patent CN101858233, realize driving the mechanism of four valves based on this.

With reference to accompanying drawing 1, accompanying drawing 1 is the schematic representation of whole driving mechanism, is on the basis of existing full VVT gear, to make up.The cam 1 of full VVT gear contact with roller 12 closely, and roller passes through spools 11 and links to each other with speed-changing swing 7.Speed-changing swing 7 links to each other with the boss of speed-changing swing 6 through axle 10, and an end of speed-changing swing 6 is fixed on and rotates freely on the axle 5, rotates freely axle 5 and is fixed on the cylinder head (omissions), the 6 generation oscillating motions of speed-changing swing 7 promotion speed-changing swings.Control cam 8 is fixed on the cylinder head (omissions), can not translation, thereby push speed-changing swing 7 itself and cam 1 are kept in touch, and maintenance speed-changing swing 6 has a correct initial position.Speed-changing swing 6 contacts with torsion spring 3, and an end of torsion spring 3 is fixed on the fixed base 4 on the cylinder head, makes it can promote speed-changing swing 6 and produces return motion.The slip surface of speed-changing swing 6 contacts with roller 13 closely, and roller 13 is fixed in rocking arm 15 with axle 14.Rocking arm 15 can promote two valves simultaneously, i.e. valve 19 and valve 219, and hydraulic tappet 20 is used for regulating the valve clearance.Have the cam 1 and cam 201 at two phase phase difference 90 degree angles on the camshaft, cam 1 is used for promoting

valve

19 and 219, and cam 201 is used for promoting valve 319 and 419.Suppose that

valve

19 and 219 is intake valves,

valve

319 and 419 is exactly an exhaust valve so.

Obvious cam

1 and 201, control cam 8 are all in this side of intake valve, and

exhaust valve

319 and 419 1 sides are to rely on a long drive link 21 to promote.Speed change fork 206 receives the promotion of drive link 21, drives rocking arm 215, and then promotes

hydraulic tappet

320 and 420, thereby promotes valve 319 and 419.Torque spring 303 is fixed on the fixed base 4 on the cylinder head, and speed change fork 206 is produced impetus, makes it to spring back to initial position at valve-closing speed change fork in season 206.Speed change fork 206 is full VVT gears of simplifying with rocking arm 215, corresponding to the speed change fork 6 in the full VVT gear, and an actuator that just moves for drive link 21.

Speed change fork 6 and stationary axle 205 thereof, spring 303, fixedly do 204 and constitute a drive system of simplifying most, this drive system is the part of full VVT gear, is the part of direct driving rolls rocking arm 215.Through a promotion that plays the drive link 21 of transmission system effect, the full VVT gear that is positioned at cylinder one side can drive two valves of opposite side.

Rocking

arm

15 and 215 rotating shaft are fixed on the cylinder head, and the position that roller is installed is all arranged on the position of two valves, are that roller is installed but have only one of them position, and another is vacant.The vacant position of inlet valve rocker 15 and exhaust valve rocker arm 215 is just in time opposite, and this is by the situation decision arranged side by side of the full VVT gear of intake valve one side, two covers.

With reference to accompanying drawing 2, accompanying drawing 2 is views of the whole driving mechanism of another angle.Cam 1 drives speed change fork 7, and cam 201 promotes speed change fork 207, control cam 8 control speed change forks 7, control cam 208 control speed change forks 207.On rocking arm 15, corresponding to that part of speed change fork 6 roller is arranged, and do not have roller corresponding to the part of speed change fork 306.Speed change fork 306 connects the speed change fork 206 of offside through drive link 21.

Control cam

8 and 208 controls for

speed change fork

7 and 207 are simultaneously, the difference on having no time.But the crank shaft angle phase place of cam 1 and cam 201 is different; Therefore in this angle, if the hypothesis cam is when rotating according to the clockwise angle direction, obvious cam 201 is exactly the cam that drives exhaust valve; Because exhaust valve is than the first unlatching of intake valve; The crank shaft angle phase difference of the two is 180 degree, and the direction angular difference of corresponding cam is exactly 90 degree, so cam 1 is vertical on direction with cam 201.

The speed change fork 206 that drives exhaust valve only is the part of the full VVT gear of this side of intake valve; And also keep the parts speed change fork 306 that dwindles of parts equivalence therewith in the main body of the driving mechanism of offside; Speed fork 306 comprises fast fork 206 and holds the axis hole of stationary axle 5, and the projection that connects fast fork 207.Speed fork 306 passes through drive link 21 fast forks 206, thereby forms the speed-changing swing system of a complete full VVT gear.

Control cam

8 and 208 is coaxial, is driven by common driving mechanism, and the shape of controlling

cam

8 and 208 can be the same or different, and they have replaced the control cam in the independent full VVT gear.

With reference to accompanying drawing 3, accompanying drawing 3 is the views from the whole driving mechanism of the 3rd angle.Speed change fork 207 connects speed change fork 306, and speed change fork 306 is limited on the cylinder head by stationary axle 5, and the speed change fork can rotate around stationary axle 5.When cam 201 promotes speed change fork 207, just can change the angle of speed change fork 306.If setting cam 201 is exhaust valve cams, cam 1 is exactly an intake valve so, and this moment, camshaft clockwise rotated.If camshaft rotates counterclockwise, then cam 201 is inlet valve cams, and cam 1 is exactly an exhaust valve cam.

With regard to the present invention; The full VVT gear of two covers is made up of

cam

1 and 201,

control cam

8 and 208,

speed change fork

7 and 207 respectively; Speed change fork 6 and 206 is the part of speed-changing swing, also is the power unit that directly promotes valve, therefore can speed change fork 206 be divided into 206 and 306 2 parts; Speed change fork 306 has been avoided the vacant state of speed change fork 207 by stationary axle 5

suspensions.Rocking arm

15 and 215 has played the effect that drives two valves with the full VVT gear of a cover, has played the effect of intermediate.Drive link 21 is the simplest transmission systems, also can use hydraulic system to drive speed change fork 206, and it is curved that the benefit of hydraulic system can make hydraulic pipe line, does not influence the layout of vitals such as igniter.The full VVT gear of two covers in the above-mentioned exemplary mechanism is shared camshaft and control camshaft; Therefore just can practice thrift a camshaft and one in the valve actuation of opposite side and control camshaft, two torque springs, a speed change fork, two rollers, cost is that each cylinder has increased by two rocking arms.

Intake valve and exhaust valve use full VVT gear to control simultaneously, and the inlet and exhaust valve variation in correct time has separately formed the valve overlap angle of satisfying the internal combustion engine needs naturally, just no longer need extra controlling mechanism adjustment valve overlap angle.Select the different cam of

curved surface

1 and 201 for use, when controlling

cam

8 and 208, can produce different effects in correct time when inlet and exhaust valve, help to optimize the correct time of different effects valve.Therefore, belong to control cam and the cam and the nonjoinder of intake valve and exhaust valve, can be because of excessively merging the forfeiture that mechanism causes the control flexibility.

Above-mentionedly be only used for explaining exemplary embodiments of the present invention.It is not exclusive or with the present invention restriction concrete form disclosed with it.It will be understood by those skilled in the art that in not departing from scope of the present invention, can make various changes and element wherein can be replaced with IF-AND-ONLY-IF element.In addition, can make a lot of modifications so that particular condition or material are applicable to purport of the present invention and do not depart from essential scope.Therefore, the invention is not restricted to realize the disclosed specific embodiment of optimal mode of the present invention, but the present invention includes all mode of executions that belong to the scope of the invention as design.Without departing from the spirit and scope of the present invention, the present invention can implement with specific explanations and other modes beyond the mode of illustrating.

Claims

1. simplifying the internal structure of an organization of a full VVT gear on the basis of existing full VVT gear, used the full VVT gear of two covers, and a cover mechanism drives intake valve, and another set of mechanism drives exhaust valve; Said two cover mechanism position are in the same side of cylinder; Two cover mechanisms replace original separately Control Shaft with shared control mechanism, promptly shared control mechanism and camshaft, and control mechanism is controlled total Control Shaft.

2. simplifying the internal structure of an organization of full VVT gear as claimed in claim 1 is characterized in that the valve that one of them mechanism drives offside is to realize through the full VVT gear that transmission system drives is simplified.

3. full VVT gear as claimed in claim 1 simplifies the internal structure of an organization; The shape that its characteristic also is said shared camshaft has difference according to the difference of the valve that is driven, and the position of inlet valve cam is than exhaust valve cam quadrature lagging on the camshaft sense of rotation.

4. full VVT gear as claimed in claim 1 simplifies the internal structure of an organization; Its characteristic is that also said intermediate is around its axle center rotation; The fixed-site of the axle center of intermediate on cylinder head, driving mechanism promotes the roller of a side of intermediate, makes the intermediate unitary rotation.

5. simplifying the internal structure of an organization of full VVT gear as claimed in claim 1, its characteristic also is normally drive link of said transmission system, also can be hydraulic system.

6. full VVT gear as claimed in claim 1 simplifies the internal structure of an organization; Its characteristic is that also the driving mechanism of said simplification is the part of existing full VVT gear mechanism; Normally directly drive the parts of valve opening, these parts rotate around stationary axle.Also keep the parts that dwindle of parts equivalence therewith in the main body of the driving mechanism of offside, and connect these parts and equivalent unit through described transmission system.

7. simplifying the internal structure of an organization of full VVT gear as claimed in claim 1, its characteristic are that also said shared Control Shaft replaces original separately Control Shaft.