CN2755289Y

CN2755289Y - Stepless variable lifting mechanism of valve for IC engine

Info

Publication number: CN2755289Y
Application number: CN 200420077901
Authority: CN
Inventors: 余坚
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-14
Filing date: 2004-07-14
Publication date: 2006-02-01
Anticipated expiration: 2014-07-14

Abstract

The utility model relates to a stepless variable lifting mechanism of a valve for an IC engine, which is arranged between a first rocking arm (3) of an opening or closing valve and a valve (1). The utility model comprises a second rocking arm (2) which is arranged on the end head of the valve, a sliding component (6) which is arranged between the first rocking arm and the second rocking arm and can slide between the two arms, and the movement can be realized by an eccentric wheel (9) through push of a traversing device (A). The sliding component extends into a groove hole of a groove (5) of the sliding component and slides in the groove hole of a groove along moving direction of the valve; the traversing device (A) is composed of moving rods (4, 7), a third rocking arm (8) which rotates around a third pivot shaft (81), and a spring (11), and the eccentric wheel (9) is driven by a control motor (10). The stepless variable lifting mechanism of a valve for an IC engine can provide an optimal valve lift within ranges of full rotary speed of the IC engine. Since elimination of a throttle valve, pumping loss can be omitted; gas inlet resistance can be reduced; gas inlet efficiency can be increased; discharge can be reduced; oil consumption can be reduced, and output power can be increased.

Description

The internal-combustion engine stepless variable valve lift mechanism

Technical field

The utility model relates to a kind of variable air valve lift range mechanism of internal combustion engine, particularly a kind of internal-combustion engine stepless variable valve lift mechanism.

Background technique

At present, on the gas distribution system of internal-combustion engine, the lift of valve generally is fixing immutable, but internal-combustion engine is also different to the requirement of gas distribution system when different operating modes, different rotating speeds running.When low-speed running, the flow velocity of gas is slower, and inertial flow is less, and excessive valve lift is unfavorable for producing intake swirl, and fuel oil and air mixing are inhomogeneous, is unfavorable for burning.And because the pumping action of closure has caused pumping loss, consumed interior energy, made internal-combustion engine sub load work limitation rate very low.When running up, the flow velocity of gas is very fast, and inertial flow is bigger, needs the resistance of bigger valve lift minimizing air inlet, so that many air inlets.

Summary of the invention

The technical problems to be solved in the utility model is to overcome the immutable shortcoming of valve lift, the variable air valve lift range mechanism of continuous stepless from low speed to high speed is provided, make the valve lift that in the full speed range of internal-combustion engine, provides best, thereby the intake efficiency of internal-combustion engine is improved.

The technical solution of the utility model is: the internal-combustion engine stepless variable valve lift mechanism, be located between valve switching motion mechanism and the valve 1, and it is characterized in that: the action output terminal of described valve switching motion mechanism is around first pivot, 3 rotating first rocking arms 3; Establish second arm 2 on the termination of valve 1, establish slider 6 between described first rocking arm 3 and described second arm 2, it can be along slippage between described two arms that contacted; Described slider 6 resists the elastic force promotion of springs by an eccentric wheel 9 and moves, and makes described slider 6 along slippage between two arms that it contacted; Described eccentric wheel 9 is driven by control motor 10.

Another technological scheme of the present utility model is: establish mobile transfer unit A between described slider 6 and the described eccentric wheel 9, its formation is a movement rod device or a rocker arrangement, or this two combination; Described mobile transfer unit A is promoted by two rightabout active forces, and one of them is produced by spring 11, and another is produced by eccentric wheel 9.

Mechanism of the present utility model can change valve lift by continuous stepless by the control Electric Machine Control, makes the valve lift that provides best in the full speed range of internal-combustion engine, thereby the intake efficiency of internal-combustion engine is improved.Power with less valve lift controlling combustion engine when sub load is worked is exported, thereby can cancel closure, thereby reduce the pumping loss of closure, when the high speed full-load operation with bigger valve lift work, reduce the resistance of air inlet, improve intake efficiency, reduce discharging to reach, reduce oil consumption, increase output power.

Description of drawings

Fig. 1 is internal-combustion engine stepless variable valve lift mechanism working drawing when full load operation of the utility model embodiment.

Fig. 2 is internal-combustion engine stepless variable valve lift mechanism working drawing when sub load turns round of the utility model embodiment.

The explanation of mark in the accompanying drawing:

1 valve, 2 second arms, second rocking arm, 3 first rocking arms, V-arrangement rocking arm

4 sliding arms, 5 slide slot, 6 sliders

7 sliding arm guide rails, 8 eccentric wheel rocking arms, 9 eccentric wheels

10 control motors, 11 sliding arm springs, 21 second pivots

Control cam 81 the 3rd pivot when 31

first pivot

32A, 32B

A moves transfer unit

Embodiment

Describe the utility model embodiment in detail below in conjunction with accompanying drawing.

Fig. 1 is internal-combustion engine stepless variable valve lift mechanism working drawing when full load operation of an embodiment of the utility model.Fig. 2 is internal-combustion engine stepless variable valve lift mechanism working drawing when sub load turns round of Fig. 1 embodiment.1 is valve among the figure, and it is arranged on the cylinder, and function is the air supply openings of opening and closing to cylinder confession inflammable gas and air mixing body, and it moves down and displacement distance represents to open air supply opening and lift, and the latter is the sign that air supply opening is opened big or smallly.3 is first rocking arm, is that Zhong Xin rotation changes with first pivot 31, is promoted by cam 32, and its effect is to open cylinder valve air inlet work on time, is the action output terminal of valve switching motion mechanism.First rocking arm of representing in this example 3 is V-arrangement rocking arms, there are two arms to constitute V-arrangement, two arms promote the V-arrangement rocking arm and remove to open valve with for example illustrated Shun Shi pin Fang Xiang the rotation commentaries on classics respectively by the elastic force of

cam

32A, 32B opposing V-arrangement priming lever spring (not shown) under their actings in conjunction.The protruding point of

cam

32A, 32B contacts simultaneously or is taken up in order of priority the moment of contact V-arrangement rocking arm two arms to be controlled by car-mounted computer (ECU), with the moment and the unlatching duration of acquisition corresponding to the asynchronous best unlatching valve of internal combustion engine load (rotating speed), become a kind of timing mechanism that can regulate the valve keying moment with the internal combustion engine load automatically, this timing mechanism proposes another patent application by the applicant, just under examination and approval, and the theme that relates to because of its non-the utility model, no longer carefully state herein.In this first embodiment, will the application's basic scheme be described, it is the brief form of the structure of Fig. 1,2 expressions.It is: be provided with stepless variable valve lift mechanism between first rocking arm 3 and the valve 1, comprise: be arranged on second arm 2 on the valve 1, establish slider 6 between described first rocking arm 3 and described second arm 2, they can be along described first rocking arm 3 that is contacted and 2 slippages of described second arm.Under the most general situation, this slider 6 is positioned a limit position by the elastic force of a spring when normality, makes it do above-mentioned slippage by the described elastic force of an eccentric wheel 9 antagonism.

Slider 6 and first rocking arm, 3 point of contact determine the stroke length of valve 1 apart from the big young pathbreaker of distance of first pivot 31, therefore, move the lift that the point of contact of slider 6 contacts first rocking arm 3 can be regulated valve 1 along first rocking arm 3.Produce to move in this example this slider action be that eccentric wheel 9 promotes sliders 6 and reaches, the eccentric size of eccentric wheel 9 can directly be converted to and promote moving of slider 6.

The concrete scheme in this example below will described is as second embodiment.In this second embodiment scheme, eccentric wheel 9 is communicated to its eccentric moving on the slider 6 through a mobile transfer unit A, described mobile transfer unit A can be varied, one of them is to establish a slide slot 5, described slider 6 stretches in the slotted eye of a slide slot 5, and slippage within it, the setting of described slide slot 5 slotted eyes makes slider 6 direction of slip direction for moving along described valve within it.Described slide slot 5 is promoted by described eccentric wheel 9 and moves, makes to stretch into described slider 6 in this groove 5 along slippage between two arms that it contacted, and described eccentric wheel 9 is by 10 drivings of control motor.

In this second embodiment, slider 6 is shaft-type part spares, and correspondingly, slide slot 5 is parts of the circular slotted eye of a belt length, and so-called long-round-shape slotted eye is that two ends are the circular arc corresponding to slider 6 diameters of axle, and the centre is connected with the straight section that both sides are parallel limit.But this is also nonessential like this, and for example slider 6 can be the square part of one section circular arc of two ends band, and the two ends of slide slot 5 slotted eyes also are corresponding circular arcs.

Described mobile transfer unit A can also be a kind of movement rod device, it is the bar that moves at assigned direction, this bar one end is directly replaced by eccentric wheel 9, and the other end is fixed described slide slot 5 or directly promoted slider 6, and this movement rod slides in a sliding arm guide rail 7.Perhaps, for example in order to increase action sensitivity, mobile transfer unit A can also be the formation that another kind is referred to as rocker arrangement: replace a rocking arm by eccentric wheel 9, utilize leverage to move slide slot 5 by this rocking arm ejection, perhaps directly promote slider 6.Perhaps, described mobile transfer unit A is with the combination of described assigned direction movement rod device and rocker arrangement.Following as the 3rd embodiment, will utilize figure `1,2 to specifically describe the formation of the mobile transfer unit A of top two kinds of scheme combinations.

This 3rd embodiment's mobile transfer unit A comprises: the sliding arm 4 of sliding arm guide rail 7, slippage in this guide rail 7, sliding arm spring 11, the eccentric wheel rocking arm 8 that changes around one the 3rd pivot 81 rotation.By eccentric wheel 9 ejection eccentric wheel rocking arms 8, control motor 10 drives eccentric wheel 9.Described sliding arm guide rail 7 makes sliding arm 4 do to move toward polyslip along the direction of slider 6 slips within it.One end of described sliding arm 4 is fixed aforementioned slide slot 5, and is replaced the other end of sliding arm 4 by eccentric wheel rocking arm 8.Described sliding arm spring 11 is provided with to such an extent that its elastic force is added in and makes described sliding arm 4 be positioned at a limit position on the sliding arm 4, leftward position as shown, when eccentric wheel 9 ejection eccentric wheel rocking arms 8, this rocking arm 8 is with the elastic force of antagonistic spring 11, ejection sliding arm 4, final mobile slider 6, thereby the lift of change valve 1.The corner of described control motor 10 control eccentrics 9 is exactly the throw of eccentric of control eccentric, controls valve lift exactly.The control motor is controlled by ECU (car-mounted computer), makes the required corner of best lift (throw of eccentric).

This embodiment can also have a kind of distortion, as the 4th embodiment, will describe this deformation program.Cancelled slide slot 5 in this example, slider 6 is connected on the pivot (not shown), this pivot is arranged on the described sliding arm 4, the characteristics of this scheme are that slider 6 does not hinder its rotation transhipment moving when moving with sliding arm 4, as allow the moving words of Ci rotation transhipment, when first rocking arm 3 and sliding arm 4 had action to be added to slider 6 simultaneously, the action of valve was more accurate, when particularly the shape of cross section of slider 6 is not circle.This routine structure is understood easily, does not illustrate again.Annotatedly be: this 4th embodiment's malformation part is also applicable among second embodiment, promptly be applicable to occasion that described mobile transfer unit A is made of the movement rod device or the occasion that constitutes by rocker arrangement, to the former, the narration here is similar, and promptly the pivot of slider 6 is located on the sliding arm 4.To the latter, this pivot will be located on the eccentric wheel rocking arm 8.

Be that example illustrates this working process of mechanism below with second embodiment:

When driver's bend the throttle (throttle), the internal-combustion engine full-load operation, the aperture that accelerator pedal (throttle) sensor detects accelerator pedal (throttle) becomes big, according to the prior data of importing the optimal valve lift of ECU (car-mounted computer), calculate best valve lift, signal is passed to control motor 10, control motor 10 drives eccentric wheel 9 and rotates, eccentric wheel 9 drives eccentric wheel rocking arm 8 and shakes to the diagram clockwise direction, thereby drive sliding arm 4, slide slot 5 and slider 6 slide to the right, make the valve lift of internal-combustion engine become big, reduce the resistance of air inlet, and utilize gas flow rate faster and bigger inertial flow to produce the effect of inertia supercharging, improve intake efficiency, reduce discharging to reach, reduce oil consumption, increase output power.

When accelerator pedal (throttle) aperture hour, internal-combustion engine is in the sub load working state, it is less that accelerator pedal (throttle) sensor detects the aperture of accelerator pedal (throttle), according to the prior data of importing the optimal valve lift of ECU (car-mounted computer), calculate best valve lift, signal is passed to control motor 10, control motor 10 drives eccentric wheel 9 and rotates round about, sliding arm 4 slides to the diagram left under the elastic force effect of sliding arm spring 11, driving slide slot 5 and slider 6 slides left, the valve lift of internal-combustion engine is diminished, with the power output of less valve lift controlling combustion engine.Because this can cancel traditional closure, has avoided the throttling pumping action of closure, reduced pumping loss, can consume thereby reduced the interior of internal-combustion engine, and less valve lift has helped producing intake swirl, make fuel oil and air mixing more even, it is more thorough to burn.

More than one second arm 2 that is arranged on the valve 1 has been described among each embodiment, this arm is replaceable to be second rocking arm that changes around second pivot, 21 rotation, its arm end is pressed described valve 1, if described first pivot 31 and second pivot 21 are in the words of the both sides of slider 6 respectively, the remolding sensitivity of regulating valve lift is bigger, this point is understood easily, does not do detailed explanation.

Claims

1, internal-combustion engine stepless variable valve lift mechanism is located between valve switching motion mechanism and the valve (1), it is characterized in that: the action output terminal of described valve switching motion mechanism is around rotating first rocking arm of first pivot (31) (3); On the termination of valve (1), establish second arm (2), between described first rocking arm (3) and described second arm (2), be provided with and this two arm (3,2) contact and can be along the slider (6) of the two arm slippages that contacted; Described slider (6) is in transmission connection with the eccentric wheel (9) that can drive its slippage; Slider is connected with the spring that can resist eccentric wheel thrust, and described eccentric wheel (9) is in transmission connection with control motor (10).

2, internal-combustion engine stepless variable valve lift mechanism according to claim 1 is characterized in that: establish mobile transfer unit (A) between described eccentric wheel (9) and the described slider (6).

3, internal-combustion engine stepless variable valve lift mechanism according to claim 2, it is characterized in that: described mobile transfer unit (A) is a slide slot (5), described slider (6) stretches in the slotted eye of described slide slot (5) with being slidingly matched, and the setting of described slide slot (5) slotted eye makes the direction of slider (6) slip direction within it for moving along described valve; Described slide slot (5) with can promote its eccentric wheel that moves (9) and be in transmission connection, simultaneously slide slot is connected with the spring that can resist eccentric wheel thrust, described slider (6) with can drive its sliding-groove (5) and be in transmission connection along slippage between two arms that it contacted.

4, internal-combustion engine stepless variable valve lift mechanism according to claim 2, it is characterized in that: the formation of set mobile transfer unit (A) is a movement rod device between described eccentric wheel (9) and the described slider (6), an or rocker arrangement, or this two combination; Described mobile transfer unit (A) is in transmission connection with eccentric wheel (9), is connected with the spring that can resist eccentric wheel thrust simultaneously.

5, internal-combustion engine stepless variable valve lift mechanism according to claim 4, it is characterized in that: the formation of described movement rod device is to comprise: sliding arm guide rail (7), can be in this guide rail (7) toward the sliding arm (4) of polyslip; The slip direction of described sliding arm (4) is consistent with the slip direction of described slider (6); One end of described sliding arm (4) is fixed a slide slot (5), and its other end and described eccentric wheel (9) are in transmission connection; Described slider (6) stretches in the slotted eye of described slide slot (5) with being slidingly matched, and the setting of described slide slot (5) slotted eye makes the direction of slider (6) slip direction within it for moving along described valve; Described sliding arm (4) is in transmission connection with described eccentric wheel (9), and is connected with the spring that can resist eccentric wheel thrust (11).

6, internal-combustion engine stepless variable valve lift mechanism according to claim 4 is characterized in that: the structure of described rocker arrangement is around the rotating eccentric wheel rocking arm of one the 3rd pivot (81) (8); Described eccentric wheel rocking arm (8) is in transmission connection with described eccentric wheel (9), and eccentric wheel rocking arm (8) is in transmission connection with slide slot (5) simultaneously; Described slider (6) stretches in the slotted eye of described slide slot (5) with being slidingly matched, and the setting of described slide slot (5) slotted eye makes the direction of slider (6) slip direction within it for moving along described valve; Described eccentric wheel rocking arm (8) is connected with the spring that can resist described eccentric wheel (9) thrust.

7, internal-combustion engine stepless variable valve lift mechanism according to claim 4 is characterized in that: the structure of described movement rod device and rocker arrangement combination is to comprise: sliding arm guide rail (7), can be in this guide rail (7) toward the sliding arm (4) of polyslip, around the rotating eccentric wheel rocking arm of one the 3rd pivot (81) (8); One end of described sliding arm (4) is fixed a slide slot (5), and the other end and described eccentric wheel rocking arm (8) are in transmission connection; Described slider (6) stretches in the slotted eye of described slide slot (5) with being slidingly matched, and the direction that is provided with of described slide slot (5) slotted eye is the direction that moves along described valve for making slider (6) slip direction within it; The slip direction of described sliding arm (4) in the sliding arm guide rail is consistent with the slip direction of slider (6); Described eccentric wheel rocking arm (8) is in transmission connection with eccentric wheel (9); Described sliding arm (4) with can be connected by the spring (11) of eccentric wheel rocking arm (8) opposing eccentric wheel (9) ejection force.

8, according to any described internal-combustion engine stepless variable valve lift mechanism in the claim 3 to 7, it is characterized in that: cancel described slide slot (5), replace following structure: described slider (6) can be around a pivot revolution, and this pivot is arranged on described sliding arm (4) or the described eccentric wheel rocking arm (8).

9, according to any described internal-combustion engine stepless variable valve lift mechanism in the claim 1 to 7, it is characterized in that: described second arm (2) be one around rotating second rocking arm of second pivot (21), its arm end is crimped on the described valve (1), and described first pivot (31) and second pivot (21) lay respectively at the both sides of described slider (6).

10, internal-combustion engine stepless variable valve lift mechanism according to claim 8, it is characterized in that: described second arm (2) be one around rotating second rocking arm of second pivot (21), its arm end is crimped on the described valve (1), and described first pivot (31) and second pivot (21) lay respectively at the both sides of described slider (6).