CN102235193A

CN102235193A - Crossed same wheel driven fully-variable valve timing gear

Info

Publication number: CN102235193A
Application number: CN2010101689441A
Authority: CN
Inventors: 朱譞晟
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-07
Filing date: 2010-05-07
Publication date: 2011-11-09

Abstract

The invention discloses a crossed same wheel driven fully-variable valve timing gear, which comprises camshafts, a roller rock arm, a driving link and a rocking arm, wherein the camshafts drive a valve to move so that the valve can be opened or closed; the roller rock arm is driven by the camshafts to move and drives the valve to open; the driving link is driven by the roller rock arm to drive the valve to open; and the rocking arm is driven by the driving link to rotate around a fixed shaft and drive the valve to open. A timing method specifically comprises the following steps that: the same cam on the same camshaft drives two valves on the same side in inlet valves and exhaust valves respectively at different moment, and the other cam on the other camshaft control the inlet valves and exhaust valves on the other side. The crankshaft angle phase relation changes of the two camshafts can generate fully-variable valve timing.

Description

Intersection is with the full Variable Valve Time gear of wheel drive

Technical field

The present invention relates to the full Variable Valve Time gear of a kind of intersection with wheel drive, it comprises two camshaft and valve driving mechanisms.

Background technique

Existing Variable Valve Time gear meaning with the overlapping angle that changes intake valve and exhaust valve, and the endurance of valve opening is fixed.But this kind valve timing mechanism is when improving the overlapping angle, and exhaust valve postpones to open, intake valve is closed too early, all caused the extra exhaust loss of motor, and caused air inflow to reduce, these all make output power and moment of torsion best on the internal combustion engine theory incur loss.The method that the timing of valve can be adjusted to theoretical optimal value is called full Variable Valve Time, comprises the timing and the inlet and exhaust valve overlapping angle of single valve.

Continously variable valve timing valve actuating mechanism piston IC engine shown in the publication number CN1831304, show and a kind ofly attempt to adopt two valves of intake valve or exhaust valve to take the method for differential On/Off to prolong the overall unlatching endurance of valve, but the inlet and exhaust valve of such mechanism is a separate configuration, all to be configured into tracheae and outlet pipe in the cylinder both sides, excessive to existing internal combustion (IC) Engine Design change, do not meet cost benefit.

Summary of the invention

This patent is made new solution at above-mentioned defective, designs a kind of new mechanism, the current design form of internal-combustion engine that can be better compatible existing, and keep original timing effect.

The mechanism that invention is provided comprises: internal-combustion engine uses the form of four valves of every cylinder, two intake valves of two exhaust valves; And use two camshafts, but the cam of each cylinder of driving has only one on the camshaft; Utilize valve actuating mechanism to accomplish that a cam on the camshaft drives an intake valve and a homonymy exhaust valve respectively in the different moment, and a cam of another one camshaft drive another intake valve and another homonymy exhaust valve respectively in the different moment; By regulating the crankshaft angles phase relationship of two camshafts, can realize the continuously comprehensive regulating action of valve timing for bent axle.

Description of drawings

Fig. 1 is a schematic representation.The method that shows the camshaft actuated valve is that timesharing drives intake valve and exhaust valve, and different intake valves and exhaust valve are to being by different cam drive.

Fig. 2 is the timing design sketch.Show the timing effect of described mechanism valve when the internal-combustion engine slow-speed of revolution.

Fig. 3 is the timing design sketch.Show the timing effect of described mechanism valve when the high rotating speed of internal-combustion engine.

Embodiment

Narrate an exemplary embodiments below with reference to the accompanying drawings.

Fig. 1 is the easy schematic representation of described mechanism.Wherein two cams 12 and 14 are to be arranged in exhaust valve 2 and 4 one sides, and intake valve 1 and 3 one sides.The angle of all cams is 220 degree angles, satisfies general internal-combustion engine and turns left right valve timing 600.Two cams all clockwise rotate.Cam 12 can promote roller rock arm 13 earlier and then promote exhaust valve 2, then close the back and promote roller 9 at exhaust valve 2, make roller rock arm 10 swings, promote kinematic link 8, and make rocking arm 7 around stationary axle 6 rotations, thereby promote intake valve 1. in like manner, cam 14 also is to differ 90 degree with the angle that similar situation successively promotes exhaust valve 4 and camshaft shown in intake valve 3. figure, i.e. crank shaft angle 180 degree.This mechanism has realized two functions: a cam timesharing drives intake valve and exhaust valve; Four valves of twin cam shaft cross-drive, differential the complete continuously of valve timing that form of the phase place of two camshafts regulated.

Fig. 2 is the described timing of mechanism when idling for internal combustion engine, traditional valve timing system adjustable camshaft is corresponding to the angle of bent axle, adjustment cam shaft angle degree makes the cam of two diverse locations be in the mutual alignment that angle differs 90 degree (corresponding crank shaft angle 180 degree) during low speed, such two camshafts just promote exhaust valve 2 and 4 at synchronization, then promote intake valve 1 and 3 after exhaust valve closing.Form timing effect as figure.Because intake valve and exhaust valve all are to open simultaneously separately, so intake valve overlaps and the exhaust valve overlapping overlaps fully, intake valve lift and exhaust valve lift are overlapping fully separately, and this moment, the timing of valve was exactly the formed timing of cam face, i.e. 220 crank angle degrees.For cylinder, two intake valves and exhaust valve are opened separately simultaneously, the valve lift of equivalence is exactly the stack of two valve lifts, i.e. exhaust valve equivalence lift is the lift that is twice in an exhaust valve, and intake valve equivalence lift is the lift that is twice in an intake valve.

Fig. 3 is the crankshaft angles of the valve timing of described mechanism when the internal-combustion engine maximum speed and the relation of valve lift.When the phase place of traditional valve timing system adjustment cam axle 12 is regulated to retarding direction, the phase place of camshaft 14 is regulated to direction in advance, and exhaust valve 2 and the intake valve 1 controlled of camshaft 12 just postpones to open late release so; Exhaust valve 4 that camshaft 14 is controlled and intake valve 3 are just opened in advance, close in advance.Intake valve 1 and 3 formed intake valve overlapping angles make intake valve equivalence lift as shown in the figure, and it begins the ascent stage with the intake valve of opening in advance 3, the descending branch of the intake valve 1 of end and late release; Exhaust valve 2 and 4 formed exhaust valve overlapping angles make exhaust valve equivalence lift as shown in the figure, it begins the ascent stage with the exhaust valve of opening in advance 4, the descending branch of the exhaust valve 2 of end and late release. the maximum overlapping angle of inlet and exhaust valve is formed by exhaust valve 2 and intake valve 3, no matter be intake valve and exhaust valve, two formed equivalent valve lifts of valve are equivalent to the effect of a single valve separately.

In a word, the present invention has adopted single cam timesharing to drive the mechanism of inlet and exhaust valve and twin cam shaft cross-drive, and utilize traditional valve timing mechanism to regulate the crankshaft angles phase relationship of two camshafts continuously, make four valves of each cylinder form continuously complete adjustable full Variable Valve Time.

Though this exemplary embodiments has been used two camshafts, does not get rid of the form that use unites two into one two camshafts, the variable technology of crankshaft angles of the different cams on same camshaft can reach the timing effect that goes out shown in the present equally.

Above-mentioned narration is only used for explaining exemplary embodiments of the present invention, and 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 in other modes beyond specific explanations and the mode of illustrating.

Claims

1. an intersection is with the full Variable Valve Time gear of wheel drive, and this mechanism comprises:

Camshaft promotes valve motion and makes it to open or close;

Roller rock arm is subjected to described camshaft and promotes and move, and promotes valve and open;

Kinematic link is subjected to the promotion of described roller rock arm, promotes valve and opens;

Rocking arm is subjected to the promotion of described kinematic link, rotates around stationary axle, promotes valve and opens.

2. intersection as claimed in claim 1 is characterized in that the numerical value of the pairing crankshaft angles of described camshaft with the full Variable Valve Time method of wheel drive, satisfies the angle requirement that valve is opened ahead of time under the internal-combustion engine minimum speed.

3. intersection as claimed in claim 1 is with the full Variable Valve Time method of wheel drive, it is characterized in that certain cam on the described camshaft constantly drives of the same side in the intake valve and the exhaust valve respectively in difference, and a camshaft only drives a pair of inlet and exhaust valve, and an other camshaft actuated another to inlet and exhaust valve.

4. intersection as claimed in claim 1 is characterized in that with the full Variable Valve Time method of wheel drive described camshaft is to rely on roller rock arm, kinematic link and rocking arm at the exhaust valve that can drive of intake valve one side, otherwise also like this.

5. intersection as claimed in claim 1 is with the full Variable Valve Time method of wheel drive, it is characterized in that described camshaft is two cams, the angle of their pairing bent axle is continuously adjustable, and continuously adjustable result is the lasting opening time that changes inlet and exhaust valve simultaneously.