CN104612777B

CN104612777B - Consecutive variable valve timing device

Info

Publication number: CN104612777B
Application number: CN201510063644.XA
Authority: CN
Inventors: 潘锁柱; 韩伟强; 田维; 韩志强; 吴学舜
Original assignee: Xihua University
Current assignee: Xihua University
Priority date: 2015-02-06
Filing date: 2015-02-06
Publication date: 2017-01-25
Anticipated expiration: 2035-02-06
Also published as: CN104612777A

Abstract

The invention discloses a consecutive variable valve timing device, and belongs to the field of internal combustion engine valve timing. The consecutive variable valve timing device is characterized in that a valve cam, a roller, a guide rail and a rocker roller are connected with each other in sequence from top to bottom; the guide rail is provided with an upper arc surface and a lower arc surface, and the left end face and the right end face of the guide rail are parallel to each other and are arranged in fixed sliding sleeves which can make the guide rail move up and down in a straight line respectively; the rocker roller is movably arranged in the middle of a rocker, the left end of the rocker is connected with a hydraulic tappet, the right end of the rocker is connected with a valve, and the valve and the hydraulic tappet are arranged on the lower portion of the rocker; the roller is connected with one end of a push rod, the other end of the push rod is connected with one end of the rocker through a hinge, the other end of the rocker is provided with a worm wheel, the worm wheel is provided with a worm which is matched with the worm wheel, the worm is connected to a stepping motor through a transmission shaft, and the middle of the rocker is provided with a rocker pivot point. According to the consecutive variable valve timing device, the consecutive variable regulation of timing can be conducted through using mechanical structure, the regulation precision is high, and the transmission efficiency is high.

Description

A kind of continuous variable valve timing apparatus

Technical field

The present invention relates to valve timing field is and in particular to a kind of continuous variable valve timing apparatus.

Background technology

Internal combustion engine intake valve and the optimal opening and closing moment of exhaust valve, i.e. valve timing, affected by factors, Load of the rotating speed of such as engine and engine etc..Research shows, a rational valve timing is for raising engine Performance there is positive role.

Existing valve timing apparatus be mostly based on fluid power by between camshaft and travelling gear produce relative displacement, by This changes the time change that camshaft is with respect to gear, and then changes timing.In order to keep the constant of timing, it is desirable to provide continue Fluid power, result in the waste of the energy.The characteristic of liquid also determines the precise control being difficult to timing simultaneously.Therefore, open Send out after one kind is capable of adjustment and get final product self-locking, the valve timing apparatus being capable of precise control being simultaneously based on machinery seem particularly Important.

Content of the invention

The technical problem to be solved is to provide a kind of valve timing apparatus being capable of continuous variable, this device energy Enough more precisely regulation and control valve timings.

For solving above-mentioned technical problem, the technical solution adopted in the present invention is:

A kind of continuous variable valve timing apparatus, have valve cam, roller, guide rail and rocking arm roller phase successively from top to bottom Connect；Described guide rail has upper arc surface and lower arc surface, and arc surface is coaxial with valve cam thereon, the radius of lower arc surface with upper The radius of arc surface is identical, and the left and right both ends of the surface of guide rail are parallel to each other, and with by the upper circular arc radius surface at upper arc surface center Line is symmetrical axial symmetry, and the left and right both ends of the surface of described guide rail are respectively placed in can be made in the fixing sliding sleeve that it moves along a straight line up and down；Institute State rocking arm roller and be movably arranged in the middle part of rocking arm, described rocking arm left end is connected with hydraulic tappet, and described hydraulic tappet is fixing not Dynamic, rocking arm right-hand member is connected with valve, and described valve and hydraulic tappet are with below rocking arm；Described roller connects push rod one end, institute State the push rod other end to be connected through the hinge swing arm one end, described swing arm other end is provided with worm gear, described worm gear is provided with The worm screw matching, described worm screw links stepper motor by power transmission shaft, and described middle part of swing arm is provided with swing arm fulcrum.

Specifically, model 42byg-5.18 of described stepper motor.

Specifically, the gearratio of described worm and gear is 16.

The invention has the beneficial effects as follows: 1, the present invention carries out the regulation of timing using frame for movement, and degree of regulation is high, transmission Efficiency high；2nd, worm-and-wheel gear has auto-lock function, and timing is adjusted after realizing does not need other measures to maintain timing, adjusts Keep constant, reduce energy consumption；3rd, the lift of valve will not be changed while adjusting timing, joining with other lift adjustment mechanism Close will not produce when using and influence each other.

Brief description

The present invention will be further described in detail with reference to the accompanying drawings and detailed description, wherein:

Fig. 1 is the original state schematic diagram of this continuous variable valve timing apparatus.

Fig. 2 is the advanced condition schematic diagram of this continuous variable valve timing apparatus.

Fig. 3 is the postponement view of this continuous variable valve timing apparatus.

In figure: 1- hydraulic tappet；2- rocking arm；3- fixes sliding sleeve；4- guide rail；5- roller；6- valve cam；7- stepping electricity Machine；8- power transmission shaft；9- worm screw；10- worm gear；11- swing arm fulcrum；12- swing arm；13- push rod；14- hinge；15- rocking arm roller； 16- valve.

Specific embodiment

It is an object of the invention to provide a kind of device being capable of continuous variable valve timing regulation, its concrete structure As shown in Figure 1: to have valve cam 6, roller 5, guide rail 4 and rocking arm roller 15 to be sequentially connected and connect from top to bottom；Guide rail 4 has upper circular arc Face and lower arc surface, arc surface is coaxial with valve cam 6 thereon, and the radius of lower arc surface is identical with the radius of upper arc surface, leads The left and right both ends of the surface of rail 4 are parallel to each other, and with by the upper arc surface radius at upper arc surface center for symmetrical axial symmetry, on The angle of arc surface determines that maximum can shift to an earlier date and maximum can postpone timing crank angle, radius of upper arc surface of guide rail 4 etc. In valve cam 6 base radius add roller 5 diameter, the left and right both ends of the surface of guide rail 4 are respectively placed in can make its upper and lower straight line In the fixing sliding sleeve 3 of motion；Rocking arm roller 15 is directly contacted with the lower arc surface of guide rail 4, and rocking arm roller 15 is movably arranged on In the middle part of rocking arm 2, rocking arm 2 left end is connected with hydraulic tappet 1, and hydraulic tappet 1 maintains static, and rocking arm 2 right-hand member is connected with valve 16, Valve 16 and hydraulic tappet 1 are with below rocking arm 2；Roller 5 connects push rod 13 one end, and push rod 13 other end is connected by hinge 14 Swing arm 12 one end, swing arm 12 other end is provided with worm gear 10, and worm gear 10 is provided with the worm screw 9 matching therewith, and worm screw 9 passes through to pass Moving axis 8 links stepper motor 7, is provided with swing arm fulcrum 11 in the middle part of swing arm 12.

Stepper motor 7 be can forward and backward stepper motor, the stepper motor of such as model 42byg-5.18, it is maximum Statical moment is 3nm.The worm gear of 16 teeth, the worm screw of single head may be selected, its gearratio is 16 in worm-and-wheel gear.

The course of work of this continuous variable advance/retard mechanism is: valve cam 6 rotates according to the set characteristics of motion, at this It is set as in bright rotating clockwise, when stepper motor 7 no any action, roller 5 is located at the center of the upper arc surface of guide rail 4. Because hydraulic tappet 1 is arranged on engine body, rocking arm 2 one end is placed on hydraulic tappet 1, and the other end is provided with valve 16, the centre of rocking arm 2 is provided with rocking arm roller 15, and now, hydraulic tappet 1 is valve 16 upwards to the force direction of rocking arm 2 Force direction to rocking arm 2 is also upwards, and guide rail 4 applies a downward power, three power to rocking arm 2 by rocking arm roller 15 It is in balance in an initial condition, valve 16 will not produce any motion.When valve cam 6 begins with lift, valve cam 6 Roller 5 is promoted to move, due to roller 5 and guide rail 4 directly contact, therefore roller 5 can push directly on guide rail 4 and move.Guide rail 4 can only Do in fixing sliding sleeve 3 and move along a straight line up and down, and the lower arc surface of guide rail 4 can push directly on rocking arm roller 15 and move.Rocking arm Roller 15 is arranged on rocking arm 2, and therefore rocking arm 2 can rotate around hydraulic tappet 1 and promote the valve 16 of the other end to move along a straight line, It is achieved in the unlatching of valve 16.After valve cam 6 reaches maximum lift, under the reaction force of valve 16, rocking arm 2 can be anti- To rotation, thus carry motion rocker arm roller 15 push rail 4 counter motion, and then promote roller 5 to move, so that roller 5 is kept and join Gas cam 6 contacts.

After stepper motor 7 turns an angle, worm screw 9 will drive worm gear 10 to rotate, and that is to say that swing arm 12 is propped up around swing arm Point 11 rotates certain angle, and swing arm 12 can promote push rod 13 to move by hinge 14 while rotating, and therefore also just makes rolling Post 5 creates motion.Because guide rail 4 is coaxial with valve cam 6, and radius is equal to valve cam base radius and roller diameter The motion of sum, therefore roller 5 actually circles around the axle center of valve cam 6, and roller 5 is during motion Also remain and contact with arc surface on valve cam 6 and guide rail 4.Further, since guide rail 4 can only be made in fixing sliding sleeve 3 Linear reciprocating motion, after therefore roller 5 moves change, the characteristics of motion of valve 16 and roller 5 are protected before moving Hold consistent.

When the direction of motion of roller 5 is consistent with the direction of rotation of valve cam 6, it is eventually exhibited as pushing away of valve timing Late, as shown in Figure 3；When the direction of motion of roller 5 is contrary with the direction of rotation of valve cam 6, it is eventually exhibited as valve timing In advance, as shown in Figure 2.

Generally speaking, when stepper motor 7 is clockwise or rotates counterclockwise, worm screw 9 enters directly driving worm gear 10 Row is clockwise or counter-clockwise swing.When swing arm 12 rotates counterclockwise, roller 5 will be dragged by push rod 13 and move right, The direction of motion is contrary with the rotation direction of valve cam 6, and valve timing will shift to an earlier date, as shown in Figure 2.When swing arm 12 rotates clockwise When, roller 5 will be dragged to left movement by push rod 13, the direction of motion is identical with the rotation direction of valve cam 6, valve timing will Postpone, as shown in Figure 3.Because worm-and-wheel gear has auto-lock function, if therefore stepper motor 7 is not operated, whole control Mechanism processed will remain stationary state, and timing state will not change, and still to postpone state unrelated with being currently at advanced condition.

Claims

1. a kind of continuous variable valve timing apparatus it is characterised in that: have valve cam (6), roller (5), guide rail from top to bottom (4) it is sequentially connected and connects with rocking arm roller (15)；Described guide rail (4) has upper arc surface and lower arc surface, arc surface and distribution thereon Cam (6) is coaxial, and the radius of lower arc surface is identical with the radius of upper arc surface, and the left and right both ends of the surface of guide rail (4) are parallel to each other, And so that by the upper arc surface radius at upper arc surface center, for symmetrical axial symmetry, the left and right both ends of the surface of described guide rail (4) are respectively It is placed in and can make in the fixing sliding sleeve (3) that it moves along a straight line up and down；Described rocking arm roller (15) is movably arranged in the middle part of rocking arm (2), Described rocking arm (2) left end is connected with hydraulic tappet (1), and described hydraulic tappet (1) maintains static, rocking arm (2) right-hand member and valve (16) it is connected, described valve (16) and hydraulic tappet (1) are with below rocking arm (2)；Described roller (5) connects push rod (13) End, described push rod (13) other end connects swing arm (12) one end by hinge (14), and described swing arm (12) other end is provided with snail Wheel (10), described worm gear (10) is provided with the worm screw (9) matching therewith, described worm screw (9) links stepping by power transmission shaft (8) Motor (7), is provided with swing arm fulcrum (11) in the middle part of described swing arm (12).

2. as claimed in claim 1 a kind of continuous variable valve timing apparatus it is characterised in that: described stepper motor (7) Model 42byg-5.18.

3. as claimed in claim 1 or 2 a kind of continuous variable valve timing apparatus it is characterised in that: described worm gear (10) snail The gearratio of bar (9) is 16.