CN103046978B

CN103046978B - To the pendulum full VVT gear of Swing-Rod

Info

Publication number: CN103046978B
Application number: CN201110312644.0A
Authority: CN
Inventors: 朱譞晟
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-10-14
Filing date: 2011-10-14
Publication date: 2016-06-08
Anticipated expiration: 2031-10-14
Also published as: CN103046978A

Abstract

Disclosure, to the pendulum full VVT gear of Swing-Rod, is valve actuation and the controlling organization of a kind of stroke piston combustion engine, can be used for gasoline engine or diesel engine. Having the technology that can realize valve duration opening time consecutive variations and keep valve stroke constant in prior art, volume ratio is huger, restricted in some applications. Present invention employs the technology to pendulum fork, the fork that cam pushes directly on contains two rollers, one with the shallower curved face contact of ledge of control cam, another and cam contact. This fork promotes the fork that another one end is fixing. When controlling cam rotation, two end swaying directions of fork can be contrary for the former, and when reverse rate difference is more big, the valve duration opening time is short, on the contrary then the time longer. Whole mechanism is compacter compared with prior art, and in-house component stress is smaller, is more suitable for the application of internal combustion engine.

Description

To the pendulum full VVT gear of Swing-Rod

Technical field

The present invention relates to a kind of to the pendulum full VVT gear of Swing-Rod, it it is one of mechanism driving valve in stroke piston combustion engine field, the timing control adjustment independent of lift of valve can be made, namely the continuously adjustable valve duration opening time and do not change valve stroke, thus reach optimize valve control purpose.

Background technology

The valve actuation of internal combustion engine adopts continuous variable valve timing can improve the inflation rate of cylinder of internal-combustion engine, improves power and efficiency, reduces cylinder operation temperature, reduces the disposal of pollutants of internal combustion engine. The inlet valve of internal combustion engine drives the intake efficiency adopting continuously variable valve lift technology can improve internal combustion engine, reduces oil consumption, improves the internal combustion engine response speed to throttle.

Simple change camshaft and crank phase relation and the angle of cam can not be changed, the angle making cam is merely able to take a middle fixed value between slow-speed of revolution angle and high tacho-angle, so when the slow-speed of revolution, exhaust valve is opened in advance, high-pressure gas premature leakage, causes power and loss of machine of torque; During high rotating speed, inlet valve continues opening time deficiency, causes the air that should suck to be closed in advance by valve and be blocked in outside cylinder, reduces inflation rate.

In the patent of publication number CN1814992A continuously variable valve timing valve actuating mechanism piston IC engine by name, it is attempted with the phase change of two camshafts to change the lasting opening time of inlet valve, but the driving effect synthesizer of simple rocker-arm is excessively simple, make valve produce a galloping motion, increase unipump gas loss. From mechanical angle, in any case design simple or complicated driving effect synthesizer, the lifting curve of valve motion is undesirable, is unfavorable for improving air inflow, and two-jawed mechanism is inherently complicated.

In the patent of the variable valve actuation of publication number CN101149000A internal combustion engine by name, the timing of valve and lift are to be mutually related, namely the lift that the lasting opening time of valve opens to valve is proportional relation, but the problem thus brought is the advantage that can not take into account VVT and lift range variable these two kinds adjustment very well. If simply amplified the maximum valve duration opening time, then reduce valve stroke when the slow-speed of revolution, cause power and loss of machine of torque.

Publication number CN101858233A is called in the patent of full VVT method and the mechanism comprising speed-changing swing mechanism, although the continuously adjustabe valve duration opening time can be accomplished, but the volume ratio of shown method and mechanism is huger, section components stress is relatively larger, weares and teares also relatively larger.Little technical scheme of wearing and tearing is more complicated comparatively speaking.

It is thus desirable to the relatively small structure of a kind of volume is relatively easy and meet the full VVT gear of function needs, with practical on internal combustion engine and improve the driving of engine valve. All of friction preferably rolling friction contacts friction with lower resistance.

Summary of the invention

This patent is improve above-mentioned deficiency to make new solution, and one, to the pendulum full VVT gear of Swing-Rod, comprises: high angle cam, and angle is more than 250 degree; Control camming, it is possible to rotate and translation; Actively fork, there is roller mid portion and upper end; Driven fork, cylinder head is fixed on and rotatable in one end, and other end promotes the roller rock arm connecting valve; Spring, cylinder head is fixed in one end, and the other end contacts the mid portion of described driven fork.

Described to the pendulum full VVT gear of Swing-Rod, it is further characterized in that described control camming is made up of cam body and camshaft.

Described the pendulum full VVT gear of Swing-Rod being further characterized in that, the lower end of described active fork is connected with axle with the wobble segment of described driven fork, the axle place of connecing can rotate.

Described to the pendulum full VVT gear of Swing-Rod, it is further characterized in that the roller of upper end of described active fork is in close contact with the cambered surface of described cam body; Middle roller and the close contact of described high angle cam.

Described to the pendulum full VVT gear of Swing-Rod, it is further characterized in that the axle of described control camming is the fixing axle of described driven fork.

Accompanying drawing explanation

Fig. 1 is schematic diagram, it is shown that to the position between the pendulum Swing-Rod each parts of full VVT gear and annexation.

Fig. 2 is fork and controls camming schematic diagram, it is shown that the actively connection of fork and driven fork, controls camming and is made up of cam body and camshaft.

Tu3Shi mechanism keeps valve stroke principle schematic, it is shown that the angular motion of the cam body in mechanism controls the rotation of fork.

Fig. 4 is the adjustment schematic diagram of phase converter, it is shown that the complicated rotation of the camshaft of mechanism's convexity wheel body drives the motor pattern controlling cam.

Tu5Shi mechanism drives the timing schematic diagram of valve, it is shown that described mechanism can individually change the timing of valve and keep valve stroke.

Detailed description of the invention

Describe an exemplary embodiment below with reference to the accompanying drawings. Eliminating part peripheral components such as chain and fluid pressure line in this embodiment, these are known parts, omit the narration of its effect.

With reference to accompanying drawing 1, being the right rear corner pictorial view of mechanism, the axle 2 of cam 1 is fixed on cylinder of internal-combustion engine lid. Roller 14 in the middle of cam 1 and actively fork 7 is in close contact. Actively the roller 13 of fork 7 upper end is in close contact with the cambered surface of cam body 8. Actively fork 7 lower end is connected with the lower end of driven fork 6 by two axles, and the circular groove of the upper end of driven fork 6 and axle 5 are in close contact, and axle 5 is fixed in cylinder head. On the fixing device 4 that 3 one sections of spring is fixed in cylinder head, the other end contacts the side of driven fork 6. The roller of the end face and valve roller rock arm 9 that swing one end of driven fork 6 is in close contact, roller rock arm 9 end thereof contacts roof jack 11, and the other end coordinates driving valve 10 with valve spring 12. This illustrates out cam 1 and drives the structure of two valves, and the driving structure of opposite side is identical with the mechanism shown in piece mark in figure.

With reference to accompanying drawing 2, it is active fork 7, driven fork 6 and control schematic diagram within camming.Control camming to be made up of cam body 8, eccentric 22 and eccentric axle 5. Actively the hole 16 of fork 7 lower end is connected with axle 17, and hole 18 is connected with axle 19. Actively there is roller 14 fork 7 middle part, and roller 13 is arranged at top. What roller 13 contacted is the curvature portion of cam body 8. Spline tooth 23 is had in cam body 8, the spline tooth on eccentric 22 in respective shaft 5, spline tooth on eccentric 22 and the spline tooth 23 on cam body 8 prolong angle direction with there being rotation, make axle 5 that the spiral rotated can be relied on to make cam body 8 rotate when rotationally and axially moving. Spline tooth 22 on axle 5 is to process on eccentric simultaneously, so when axle 5 rotates, cam body 8 can have translation in the cross sectional planes of axle 5. The axial length of eccentric 22 is less than cam body 8, eccentric 22 is made can axially to have bigger displacement relative to cam body 8, this displacement is determined by the pitch of oblique spline tooth 23, and when making eccentric 22 move axially, cam body 8 has the rotational angle that design intentionally gets. Axle 5 is fixed on cylinder of internal-combustion engine lid and is in close contact with the arcuate groove 20 on driven fork 6, the arcuate groove 21 on driven fork 15, projection 24 and 25 is not closed so that driven fork 6 is semifixed on cylinder of internal-combustion engine lid by axle 5, in like manner driven fork 15 is also such, because there being the support of valve roller rock arm and valve spring during normal operation, therefore fork has and retrains completely. Distance between projection 24 and 25 is just can allow for axle 5 by being advisable. The angular motion of axle 5 and move axially and can control respectively, does not interfere with each other, can be completed by hydraulic system or electric system. Driven fork 6 and 15 is irremovable in the constraint being axially also affected by cylinder head of axle 5, is thus in the cam body 8 between two forks also irremovable axially suffering restraints of axle 5, and therefore axle 5 can do axially adjustable motion.

Actively fork 7, driven fork 6 and 15 form a movable entirety, this entirety has and retrains completely, when maintaining static, there is fixing shape and position at cam and control camming, the constraint of its left-hand is made up of cam, dextrad and upwards retraining is made up of axle 5, constraint downwards is made up of roller rock arm 9 and the valve spring 12 of valve, and rotational restraint is made up of spring 3 and fixing device 4.

Actively fork 7 is containing two rollers, is respectively used to actively fork 7 and contacts with cam body 8 and cam 1, reduces friction when having arrived mutual motion between parts, reduce loss. Driven fork 6 and 15 and the way of contact of axle 5 make lubrication relatively convenient, lubricant sprayer or axle 5 hollow cavity can be used to provide the mode of lubricating oil to lubricate. Same lubricating system can also be used for the oblique spline tooth lubrication between eccentric 22 and cam body 8.

With reference to accompanying drawing 3, it it is the principle schematic of mechanism's adjustment valve timing. The rotation of cam body 8 promotes actively fork 7 to rotate, and therefore driven fork 6 rotates an angle, and mechanism is from solid line position to dotted line position. When cam 1 promotes actively fork 7, driven fork 6 is ability pushing rolling wheels rocking arm 9 after one angle of idle running, and during cam 1 release actively fork 7, driven fork 6 just returns to initial position after faster discharging roller rock arm 9 angle that dallies. Therefore, after this adjustment action, the lasting opening time of valve shortens. Because the rotation adjustment action of cam body 8 is that continuous stepless is not adjustable, therefore valve timing is also continuously adjustable.

With reference to accompanying drawing 2 and 4, it is that mechanism regulates the principle of maintenance valve stroke during valve timing. When cam 1 is in maximum rise be valve stroke maximum time, actively no matter constant under any adjustment state the position of fork 7 and driven fork 6 is, therefore it is required that cam body 8 has individual compound motion, namely rotate from solid line position and move to dotted line position, rotational action is by the surge motion control of axle 5, and translational motion is then realized by the rotational motion of axle 5. The rotation of eccentric 22 makes the lower rightward translational motion of cam body 8, and result is reconciled in the rotational motion of cam body 8 and the synthesis of translational motion, and cam body 8 produces the movement effects of the axis rotation around roller 13, so that valve stroke is constant.

The compound motion of cam body 8 is in the cross-wise direction of axle 5, with axially unrelated, because cam body 8 is irremovable in axial constraint by driven fork 6 and 15. The driving of this compound motion is to be driven by the compound motion of axle 5, and the compound motion of axle 5 is axial and angular motion, and therefore driven fork 6 and 15 will not produce transport motion when axle 5 moves, and is equivalent to driven fork 6 and 15 and is fixed on axle 5.

With reference to accompanying drawing 2,3,4, the principle keeping valve stroke constant is in that to promote in active fork 7 process at cam 1, actively the roller 13 of fork 7 can produce moving up and down relative to cam body 8, during valve opening, roller 13 position is top, during valve-closing, roller 13 position is on the lower, therefore can regulate the lateral attitude of actively fork 7 and roller 13 and angle without final change valve stroke. Simultaneously, cam body 8 rotates an angle, makes the general direction of the curved surface contacted with roller 13 change, and therefore for actively fork 7, the direction of motion of this one end of roller 13 can produce fundamental change, slow-speed of revolution adjustment state from the right to the left side, and completely contrary during high speed adjustment state. If regarding active fork 7 as lever, and regard the position closest to zero of the movement rate on lever as fulcrum, it can be seen that actively the fulcrum of fork 7 is inside lever in slow-speed of revolution adjustment state, in high rotational speed regulation state it is then outside lever, namely the method regulating balance pivot position is not directly regulate position of the fulcrum, but continuously adjusting on lever the motor pattern of any thus being equivalent to the fulcrum of lever at continuous moving, such mode can be called the virtual pivot technology of lever. The advantage of this technology is need not to have a complete lever in form, it is thus only necessary to a part for lever is just passable, therefore reduces lever entire length; The excursion of balance pivot can be changed on a large scale without extending lever length simultaneously.

With reference to accompanying drawing 5, it it is the effect of the continuous variable valve timing that mechanism provides. With reference to accompanying drawing 3, the corresponding relation of visible valve stroke and crankshaft angles on valve lift diagram, the time that valve duration is opened varies continuously to the solid line of higher rotation speed from more slow-revving dotted line, the opening time of valve puies forward previous angle in direction in advance, shut-in time postpones an angle at retarding direction, thus the time continuously adjustable that valve duration is opened, the advantageously gas leakage in time reducing internal combustion engine low speed, reduce pump gas loss during internal combustion engine height rotating speed, increase inflation rate and the hoisting power of cylinder

In general, present invention employs the virtual pivot technology of lever, utilize the swing controlling the changeable motor adjustment of camming actively one end of fork, the swing making this one end is prolonged the component of horizontal direction and is continuously adjusted, it seems that the lever overall from active fork swings, the virtual fulcrum continuous moving that lever is surrounded, thus changing actively fork and the flutter rate of driven fork, can change the time that valve duration is opened continuously.

Above-mentioned narration be only used for explain the present invention exemplary embodiments, it be not exclusive or limit the invention to its disclosed in concrete form.It will be understood by those skilled in the art that not necessarily departing from the scope of the present invention, it is possible to make various change and element therein can be replaced with IF-AND-ONLY-IF element. Furthermore, it is possible to make a lot of amendment so that particular condition or material are applicable to the purport of the present invention without departing from essential scope. Therefore, the invention is not restricted to the specific embodiment realizing disclosed in description of the presently preferred embodiments as design, but the present invention includes all embodiments of belonging to the scope of the invention. Without departing from the spirit and scope of the present invention, the present invention can by specific explanations and in the way of illustrating beyond other modes implement.

Claims

1. pair pendulum full VVT gear of Swing-Rod, comprises: high angle cam, and angle is more than 250 degree; Control camming, it is possible to rotate and translation; Actively fork, there is roller mid portion and upper end; Driven fork, cylinder head is fixed on and rotatable in one end, and the other end promotes the roller rock arm connecting valve; Spring, cylinder head is fixed in one end, and the other end contacts the mid portion of described driven fork;

Described control camming is made up of cam body and camshaft;

The lower end of described active fork is connected with axle with the wobble segment of described driven fork, and the axle place of connecing can rotate;

The roller of the upper end of described active fork is in close contact with the cambered surface of described cam body; Middle roller and the close contact of described high angle cam;

Described camshaft is the fixing axle of described driven fork.

2. as claimed in claim 1 to the pendulum full VVT gear of Swing-Rod, it is characterised in that described active fork is simultaneously connected with two driven forks, and driven fork is respectively in two sides of active fork.

3. as claimed in claim 1 to the pendulum full VVT gear of Swing-Rod, it is characterised in that described driven fork upper end is that semi open model is connected with camshaft contact position.

4. as claimed in claim 1 to the pendulum full VVT gear of Swing-Rod, it is characterised in that the contacts side surfaces of described active fork upper end roller and described cam body, camshaft inserts in cam body and be simultaneously the fixing axle of described driven fork.

5. as claimed in claim 1 to the pendulum full VVT gear of Swing-Rod, it is characterized in that described camshaft has eccentric, having oblique spline tooth on eccentric cylinder, cam body inner hole wall has corresponding tiltedly spline tooth, eccentric axial length is less than the axial length of cam body.

6. as claimed in claim 1 to the pendulum full VVT gear of Swing-Rod, it is characterized in that using the virtual pivot technology of a kind of lever, regulating the method for balance pivot is continuously adjust on lever the motor pattern of any thus being equivalent to the fulcrum of lever at continuous moving, concrete grammar is to regulate the deflection angle of the camshaft in described control camming and axial position, the direction making the cam body in described control camming changes and realizes the rotation of cam body and the compound motion of translation, make the track generation directional change of the axe movement of the roller of described active fork upper end contacted with cam body, the immovable basis of described high angle cam motor pattern changes the motor pattern of described active fork, thus equivalence changes the position of the fulcrum of described active fork.