CN115111020A

CN115111020A - Stepless variable lift valve rocker mechanism

Info

Publication number: CN115111020A
Application number: CN202210765966.9A
Authority: CN
Inventors: 苏立群; 苏质文
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-09-27
Anticipated expiration: 2042-06-30
Also published as: CN115111020B

Abstract

The invention discloses an electrodeless variable lift valve rocker mechanism, which belongs to the technical field of engine valve timing mechanism and comprises a rocker, a rocker support and a limiting component; the rocker arm comprises an abutting end and a hinged end, a driving cam positioned between the abutting end and the hinged end is abutted to the upper portion of the rocker arm, the abutting end is abutted to a valve rod with a valve return spring and drives the valve rod to move axially, and the hinged end is hinged to the rocker support and drives the rocker support to rotate; the rocker arm support is provided with an elastic resetting component which enables the rocker arm support to return in a convolution way, and the elastic resetting component is compressed before the valve resetting spring when the rocker arm is stressed; the limiting component is positioned on the rotation path of the rocker arm support and used for changing the rotation terminal point of the rocker arm support. The mode and the geometric principle of the invention for adjusting the valve lift are different from the prior art, the swing amplitude of the rocker arm is changed by changing the autorotation end point of the rocker arm support so as to change the maximum axial displacement distance of the valve rod, and the valve lift can be changed without influencing the working precision of the driving cam and the rocker arm.

Description

Stepless variable lift valve rocker mechanism

Technical Field

The invention relates to the technical field of engine valve timing mechanisms, in particular to a stepless variable lift valve rocker mechanism.

Background

The air distribution mechanism of the engine is an actuating mechanism which is responsible for providing air required by fuel oil combustion for the cylinder and discharging waste gas generated by combustion, and mainly comprises an engine valve seat, a valve rod and a rocker mechanism for driving the valve rod to reciprocate, a valve channel communicated with the side wall and the bottom end is arranged on the valve seat, a spring groove is formed in the upper portion of the valve seat, a valve rod through hole communicated with the valve channel is formed in the lower end of the spring groove, the valve rod extends into the valve channel through the valve rod through hole, an end cap capable of sealing an opening in the lower end of the valve channel is arranged at the end of the valve rod, a valve reset spring capable of enabling the valve rod to reset is arranged in the spring groove, the rocker mechanism drives the valve rod to reciprocate, and the air inlet and exhaust processes of the valve channel can be realized. In terms of working principle, the main function of the valve actuating mechanism is to open and close the intake and exhaust valves of the cylinder according to a certain time limit, thereby realizing the whole process of air change and supply of the engine cylinder. The set of actions of air intake and air exhaust can be regarded as the process of human body inspiration and expiration, and the size and the time for opening a valve channel of an engine, compared with lips, determine the flow rate of the air intake and the air exhaust. The greater the angle at which the lips are opened, the longer the opening time, the greater the flow in and out, and vice versa. The same reasoning applies to engines, which results in the concept of valve lift and timing. The valve lift is as the angle at which the lips open and the valve timing is as the time at which the lips open. In a three-dimensional view, the angle plus time is the size of a space, and the angle plus time also determines the air intake and exhaust amount in unit time. In order to further develop the potential of the traditional internal combustion engine, engineers develop a variable valve lift technology on the basis of the standard configuration of the current engine, and when the variable valve lift technology and the variable valve lift technology are effectively combined, higher air intake and exhaust efficiency is provided for the engine under various working conditions and rotating speeds. The oil consumption level is also reduced while the power is improved.

The variable valve lift technology can match a proper valve lift at different rotating speeds of an engine, so that the torque is abundant at a low rotating speed, and the horsepower is strong at a high rotating speed. The system uses less valve lift during low rotating speed, thus being beneficial to increasing turbulence in a cylinder and improving combustion speed and increasing low-speed torque of an engine, and the system uses larger valve lift during high rotating speed to obviously improve air inflow so as to improve power output during high rotating speed. At present, the methods for realizing the variable valve lift mainly have the following typical application modes: honda i-VTEC technology, BMW's Valvetonic technology, and daily VVEL technology. However, the Honda i-VTEC technology is a two-section variable valve lift system and cannot be continuously adjusted. The Valvetonic technology of BMW has complex mechanism and larger occupied space of the mechanism. Although the daily VVEL technology is a continuously adjustable variable valve lift system, the added mechanism occupies larger space, and the friction pair has more power loss.

In order to solve the problems, the patent number 201610373993.6 entitled "stepless variable lift valve rocker mechanism and corresponding valve device" discloses a valve rocker mechanism which has a simple structure and can realize stepless adjustment of the valve lift, and comprises a crank connecting rod assembly, a crank shaft position adjusting assembly, a rocker arm and a rocker arm driving assembly; the crank connecting rod assembly comprises a crank, a crank shaft, a connecting rod and a connecting rod resetting tension spring, the crank is an eccentric wheel, a first eccentric hole is formed in the eccentric wheel, the eccentric wheel is connected to the crank shaft through the first eccentric hole, and the connecting rod is an eccentric sleeve and is sleeved outside the eccentric wheel; one end of the connecting rod resetting tension spring is connected with the connecting rod, and the other end of the connecting rod resetting tension spring is connected with a fixed point; the rocker arm is a lever taking the eccentric part of the connecting rod as a middle fulcrum, the left end of the rocker arm is hinged with the upper end of the valve rod, and the right end of the rocker arm is in driving fit with the rocker arm driving component; the crankshaft position adjusting assembly comprises a worm wheel and a worm, the worm wheel is arranged on a fixed rotating shaft on the right side of the valve rod, and the worm is in driving fit with external teeth of the worm wheel. The turbine is provided with a second eccentric hole, and the first eccentric hole and the second eccentric hole are connected with the crank shaft. The positions of the first eccentric hole and the second eccentric hole can be changed by changing the rotation angle of the worm, so that the expansion length of the crank connecting rod, namely the variation amplitude of the middle fulcrum of the rocker arm, is controlled, the swing amplitude of the rocker arm around the middle fulcrum under the pushing of the cam is changed, and the variation of the valve lift is realized. However, the above patent has a great problem that the driving precision of the rocker arm is affected when the rocker arm is adjusted steplessly during the operation process. The specific reasons are as follows: at this time, it is assumed that the rocker arm is in a non-operating state, when the worm changes the rotation angle of the worm wheel, the positions of the first eccentric hole and the second eccentric hole are changed accordingly, and the whole body moves upwards or downwards, so it is not difficult to think that if the connecting rod is not fixed at a certain position, the connecting rod is influenced by the position change of the first eccentric hole and the second eccentric hole in the adjusting process and also moves upwards or downwards, but in the above patent, only the connecting rod reset tension spring is arranged to pull the connecting rod, so as to ensure that the connecting rod is stable at a certain position in the adjusting process, but actually, the connecting rod is difficult to be completely unmoved only by the connecting rod reset tension spring, so that the connecting rod can shake repeatedly, and finally, the rocker arm is present on the rocker arm and shakes along with the connecting rod, therefore, the arrangement mode of the above patent has no problem when the rocker arm is not in an operating state, once the rocker arm is in a working state, the driving precision of the rocker arm can be seriously influenced by the rocking problem of the rocker arm caused by stepless adjustment, and finally the precision of the valve lift is influenced.

Disclosure of Invention

The invention aims to solve the technical problems and provides an electrodeless variable lift valve rocker mechanism, the valve rocker mechanism adopts different adjustment modes and geometric principles when adjusting the valve lift, the valve rocker mechanism changes the maximum rotation angle of a rocker support, changes the swing amplitude of a rocker, especially the swing amplitude of a butt end, and finally changes the maximum axial displacement distance of a valve rod by changing the autorotation end point of the rocker support, so that the valve lift can be changed on the premise of not influencing the normal work of a driving cam and the rocker, the change of the rotating speed of an engine is responded in time, and the practicability is stronger.

In order to achieve the purpose, the invention provides the following scheme: the invention discloses an electrodeless variable lift valve rocker mechanism, which comprises a rocker, a rocker support and a limiting component, wherein the rocker support is arranged on the rocker support; the rocker arm comprises a butt joint end and a hinged end, a driving cam positioned between the butt joint end and the hinged end is in butt joint with the upper portion of the rocker arm, the butt joint end is in butt joint with a valve rod with a valve return spring and drives the valve rod to move axially, and the hinged end is hinged with the rocker arm support and drives the rocker arm support to rotate; the rocker arm support is provided with an elastic resetting component which enables the rocker arm support to return in a rotary mode, and the elastic resetting component is compressed before the valve resetting spring when the rocker arm is stressed; the limiting component is positioned on the rotation path of the rocker arm support and used for changing the rotation terminal point of the rocker arm support.

Preferably, the rocker arm support comprises a rotating shaft, the rocker arm support is sleeved on the rotating shaft, and axial limiting blocks attached to two sides of the rocker arm support are fixed on the rotating shaft.

Preferably, the axial limiting block is provided with a rotating shaft mounting hole, and the rotating shaft is fixed in the rotating shaft mounting hole through a fixed key.

Preferably, the limiting component comprises a limiting pin shaft arranged between the axial limiting blocks on two sides of the rocker arm support, and the rotating shaft rotates through an angle adjusting device.

Preferably, the hinged end is hinged to the rocker arm support through a support pin shaft.

Preferably, the elastic reset component comprises a support reset spring, one end of the support reset spring is fixed at a preset position, and the other end of the support reset spring is connected with one end, far away from the support pin shaft, of the rocker arm support.

Preferably, the rocker arm is a bent rod with a convex middle part.

Preferably, a cam action roller for abutting against the driving cam is arranged at the convex part in the middle of the bent rod.

Preferably, the abutment end abuts against the valve stem via a valve actuation roller.

Preferably, the end of the valve rod is provided with an abutting platform which is convenient for the valve action roller to abut against.

Compared with the prior art, the invention has the following technical effects:

1. the invention provides a stepless variable lift valve rocker mechanism, which is completely different from the traditional valve distribution structure for realizing the continuous adjustment of the valve lift in the adjusting mode and the geometric principle, can ensure that the lift and the shape of a driving cam are unchanged, the phase relation between the valve opening and closing time and the valve rocker mechanism is unchanged, and can realize the stepless adjustment of the valve lift through the adjustment of the stepless variable lift valve rocker mechanism; when the valve lift is adjusted, the initial instantaneous positions of the rocker arm, the driving cam and the rocker arm support cannot be influenced, the maximum rotation angle (the rotation end point position of the rocker arm support) of the rocker arm support is changed, namely the change of the hinge point of the rocker arm and the hinge point of the rocker arm support and the center distance of the cam is changed, the swing amplitude of the rocker arm is changed, and the change of the lift of the valve is realized.

2. According to the invention, the rotating shaft and the axial limiting block exist, so that the rocker arm support can rotate more stably.

3. According to the invention, the limiting pin shaft which is used for limiting the rotation of the rocker arm support is fixed on the axial limiting block, and the initial position of the limiting pin shaft on the autorotation path of the rocker arm support can be changed only by changing the initial angle of the rotating shaft, so that the autorotation end point of the rocker arm support, namely the maximum rotation angle of the rocker arm support, is changed, the adjustment of the valve lift is realized, and the adjustment mode is simpler and more reliable.

4. According to the invention, the rocker arm is abutted with the driving cam through the cam action roller, so that the friction resistance between the driving cam and the rocker arm can be effectively reduced, and the driving cam can drive the rocker arm more smoothly.

5. According to the invention, the abutting end of the rocker arm abuts against the valve rod through the valve action roller, so that the friction resistance between the valve rod and the rocker arm can be effectively reduced, and the rocker arm can drive the valve rod more smoothly.

6. According to the invention, the abutting platform is arranged at the end of the valve rod, has enough area, and can cover the moving range of the valve action roller, so that the valve action roller can be prevented from being separated from the valve rod when moving in the horizontal direction due to the swinging of the rocker arm, and the rocker arm can be ensured to drive the valve rod at any time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic diagram showing the construction of an infinitely variable lift valve rocker mechanism;

FIG. 2 is a partial side view of an infinitely variable lift valve rocker mechanism;

FIG. 3 is a top perspective view at the rocker arm stand;

FIG. 4 is a schematic diagram of the effect of an infinitely variable lift valve rocker mechanism on valve lift variation;

fig. 5 is a schematic diagram of a valve opening numerical curve of the operation of the stepless variable lift valve rocker mechanism.

Description of reference numerals: 1. a rocker arm; 2. a rocker arm support; 3. a drive cam; 4. a rotating shaft; 5. an axial stop block; 6. a fixed key; 7. a limiting pin shaft; 8. a support pin shaft; 9. a support return spring; 10. a cam action roller; 11. a valve actuating roller; 12. a valve seat; 13. a valve passage; 14. a spring mounting groove; 15. a valve return spring; 16. a valve stem; 17. abutting against the platform; 18. and (7) a plug.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment discloses an electrodeless variable lift valve rocker mechanism, which comprises a rocker arm 1, a rocker arm support 2 and a limiting component, as shown in fig. 1 to 5; rocker arm 1 includes hinged end and butt end, the hinged end is articulated with

rocker support

2, 16 butts of valve stem on butt end and the valve seat 12, be equipped with the valve passage 13 of its lateral wall of intercommunication and bottom on the valve seat 12, spring mounting groove 14 has been seted up on the upper portion of

valve seat

12, 14 lower extremes of spring mounting groove are equipped with a valve stem via hole that communicates with valve passage 13, valve stem 16 stretches into in the valve passage 13 through the valve stem via hole, the end of valve stem 16 is equipped with and can seals valve passage 13 lower extreme open-ended end cap 18, be equipped with a valve reset spring 15 that can make valve stem 16 reset in the spring mounting groove 14. The butt has drive cam 3 above rocking arm 1, and drive cam 3 is located between the butt end and the hinged end of rocking arm 1, and drive cam 3 can keep carrying out the rotation in the normal position to the contact promotes the motion of rocking arm 1, and during the motion of rocking arm 1, the hinged end of rocking arm 1 can drive rocking arm support 2 and keep carrying out the rotation of normal position, and the butt end of rocking arm 1 then can drive valve stem 16 and carry out the motion along its axial. The rocker arm support 2 is provided with an elastic reset component, the elastic reset component can enable the rocker arm support 2 after rotation to return, the elasticity of the elastic reset component is smaller than that of the valve reset spring 15, so that when the rocker arm 1 is driven by the driving cam 3, the elastic reset component is compressed before the valve reset spring 15, the hinged end of the rocker arm 1 moves firstly, the rocker arm support 2 is driven to rotate, at the moment, the valve reset spring 15 is not compressed, the abutting end of the rocker arm 1 cannot press the valve rod 16, and the valve rod 16 is kept still; the stop member is located rocker arm support 2's rotation route, and when rocker arm support 2 was the rotation motion under the hinged end drive of rocker arm 1, can receive stop member's the blockking and unable continuation motion when rocker arm support 2 rotated to a certain position in rotation route, then the valve reset spring 15 that does not have the compressed originally begins to be compressed, the valve stem 16 that originally keeps motionless begins to move. The position of the limiting member on the rotation path of the rocker arm support 2 can be changed, so that the rotation end point of the rocker arm support 2 is changed, the maximum rotation angle of the rocker arm support 2 is changed, the swing amplitude of the hinged end of the rocker arm 1 is changed, the swing amplitude of the rocker arm 1 is changed, and finally the motion amplitude of the abutting end of the rocker arm 1 is changed, the maximum motion distance of the valve rod 16 in the axial direction is changed, and the lift range of the valve rod 16 is changed. The specific corresponding relationship is as follows: the maximum rotation angle of the rocker arm support 2 is increased, the swing amplitude of the hinged end is increased, and the swing amplitude of the corresponding abutting end is reduced, so that the maximum movement distance of the valve rod 16 is reduced, and the valve lift is reduced; the maximum rotation angle of the rocker arm support 2 is reduced, the swing amplitude of the hinged end is reduced, and the swing amplitude of the corresponding abutting end is increased, so that the maximum movement distance of the valve rod 16 is increased, and the valve lift is increased.

The process and the principle of adjusting the lift of the engine valve by the stepless variable lift valve rocker mechanism are as follows:

when the driving cam 3 rotates (the rotation direction of the driving cam 3 needs to be opposite to the rotation direction of the rocker arm support 2, and is shown in fig. 4), the height of the driving cam 3 is increased continuously, so that the rocker arm 1 is pushed to move, because the elasticity of the valve return spring 15 is greater than that of the return member, the valve rod 16 does not move, the rocker arm support 2 starts to rotate under the driving of the hinged end of the rocker arm 1, namely the hinged end of the rocker arm 1 and the rocker arm support 2 move together, and the center distance between the hinged end of the rocker arm 1 and the hinged point of the rocker arm support 2 and the driving cam 3 is increased continuously;

when the rocker arm support 2 rotates to the position of the limiting component, the rocker arm support 2 stops rotating due to the blocking of the limiting component, the position of the hinged end of the rocker arm 1 is fixed, the distance between the hinged end of the rocker arm 1 and the cam 1 cannot be increased, and the distance between the centers reaches the maximum value. After the point is over, the residual height of the cam 1 pushes the butt joint end of the rocker arm 1 to drive the valve rod 16 to compress the valve return spring 15, and the valve rod 16 moves downwards along the axial direction and opens the opening at the lower end of the valve channel 13 to open the valve; it can be seen that the valve opening amplitude, i.e. the maximum distance that the valve stem 16 moves axially downwards, depends on the maximum distance that can be achieved by the center distance between the hinged end of the rocker arm 1 and the drive cam 3, and how much the maximum center distance that can be achieved between the hinged end of the rocker arm 1 and the drive cam 3 depends on the maximum angle that the rocker arm support 2 can rotate, i.e. the smaller the maximum rotation angle of the rocker arm support 2, the smaller the maximum distance that can be achieved by the center distance between the hinged end of the rocker arm 1 and the drive cam 3, and the larger the maximum distance that the valve stem 16 moves axially downwards, the larger the valve opening amplitude, the larger the valve lift, and vice versa the smaller the valve lift. Therefore, the maximum rotation angle of the rocker arm support 2 can be adjusted by only adjusting the position of the limiting component on the rotation path of the rocker arm support 2, the opening amplitude of the valve can be adjusted in an electrodeless manner, and the valve lift can be changed. Fig. 5 shows the curve of the valve opening variation of the valve rocker mechanism at different maximum rotation angles set by the rocker arm support 2;

when the driving cam 3 rotates over an extreme point of elevation, the elevation is continuously reduced, the valve rod 16 rebounds gradually under the action of the valve return spring 15 to drive the rocker arm 1 to swing reversely, at the moment, the power for swinging the rocker arm 1 is provided by the valve return spring 15 and the elastic return component which starts to pull the rocker arm support 2 out of a dead point position (namely, is far away from the limiting component) and the rocker arm 1 returns to an initial position along with the continuous reduction of the elevation of the driving cam 3 until the elevation returns to zero.

The position change of the limiting component on the autorotation path of the rocker arm support 2 (the maximum rotation angle of the rocker arm support 2) is an independent variable which is manually adjusted according to the design requirement of the valve opening amplitude, and the valve opening amplitude is a dependent variable thereof; no matter how the angle of the rocker arm support 2 rotating by the maximum angle is adjusted, when the valve rocker arm mechanism operates, the lift range of the overhead driving cam 3 is unchanged, and no matter how the angle of the rocker arm support 2 rotating by the maximum angle is adjusted, when the valve rocker arm mechanism operates, the phase relation between the driving cam 3 and the rocker arm 1 is unchanged, so that the angle adjustment of the rocker arm support 2 rotating by the maximum angle, namely the adjustment of the valve lift range, can be carried out no matter whether the rocker arm 1 and the driving cam 3 are in a stop state or a motion state.

In this implementation, as shown in fig. 1 to 5, including pivot 4, rocker arm support 2 cup joints on pivot 4, and pivot 4 is fixed with two axial stopper 5, and two axial stopper 5 divide establish in rocker arm support 2 both sides and with the laminating of rocker arm support 2 lateral wall to limit 2 axial displacement of rocker arm support, avoid rocker arm support 2 to rotate on pivot 4.

Further, in this implementation, as shown in fig. 1 to 5, the axial limiting block 5 is provided with a rotating shaft mounting hole, and the rotating shaft 4 is fixed in the rotating shaft mounting hole through a fixing key 6, so that the axial limiting block 5 and the rotating shaft 4 are fixed. After taking out fixed key 6, also can realize that axial stopper 5 demolishs fast to dismantle rocker arm support 2 from pivot 4, with change new rocker arm support 2, convenient maintenance.

In this implementation, as shown in fig. 1 to 5, the limiting component includes a limiting pin 7, the limiting pin 7 is installed between two axial limiting blocks 5, and when the rocker arm support 2 rotates, the lower edge of the rocker arm support 2 contacts the limiting pin 7, and the rocker arm support 2 can be prevented from continuing to rotate under the blocking of the limiting pin 7. The rotating shaft 4 is driven to rotate by the angle adjusting device so as to realize the angle change of the rotating shaft 4, thereby changing the position of the limiting pin shaft 7 on the autorotation path of the rocker arm support 2. The angle adjusting device can adopt any type of device as long as the rotation angle of the rotating shaft 4 can be changed, such as a driving motor.

In this embodiment, as shown in fig. 1 to 5, a support pin 8 is provided on the rocker arm support 2, and the hinged end of the rocker arm 1 is hinged to the support pin 8. Preferably, in this embodiment, the rocker arm support 2 is in a drop shape with a small end and a large end, the support pin 8 is disposed on the small end of the rocker arm support 2, and the large end of the rocker arm support 2 is sleeved on the rotating shaft 4.

In this embodiment, as shown in fig. 1 to 5, the elastic restoring member includes a support restoring spring 9, one end of the support restoring spring 9 is fixed at a predetermined position, and the other end is connected to one end of the rocker support 2 away from the support pin 8. The rocker arm stand 2 is always pulled by the stand return spring 9, thereby providing a power for the swing return of the rocker arm stand 2.

In this embodiment, as shown in fig. 1 to 5, the rocker arm 1 is a curved lever with a convex middle portion, that is, the rocker arm 1 is a curved lever with a relatively high middle fulcrum and relatively low two end fulcrums, the middle fulcrum abuts against the driving cam 3, one side fulcrum (i.e., the hinged end of the rocker arm 1) is hinged with the support pin 8, and the other side fulcrum (i.e., the abutted end of the rocker arm 1) abuts against the valve stem 16.

Further, in this embodiment, as shown in fig. 1 to 5, a cam action roller 10 is hinged to a convex part (middle pivot) in the middle of the curved bar, and the cam action roller 10 abuts against the driving cam 3, that is, the rocker arm 1 abuts against the driving cam 3 through the cam action roller 10, and compared with the direct abutment of the rocker arm 1 and the driving cam 3, the friction resistance can be effectively reduced, and the driving cam 3 can be ensured to smoothly drive the rocker arm 1.

Further, in the present embodiment, as shown in fig. 1 to 5, the abutting end (i.e., the fulcrum at the side where the bent lever abuts against the valve stem 16) of the rocker arm 1 is hinged with the valve operating roller 11, and the valve operating roller 11 abuts against the end of the valve stem 16, that is, the rocker arm 1 abuts against the valve stem 16 through the valve operating roller 11, so that friction resistance can be effectively reduced compared with the case where the rocker arm 1 directly abuts against the valve stem 16, and a smooth valve stem 16 of the rocker arm 1 can be ensured.

Further, in this embodiment, as shown in fig. 1 to 5, the end of the valve stem 16 is provided with an abutting platform 17 for facilitating abutting of the valve operating roller 11, because the rocker arm 1 moves in the horizontal direction as a whole when rotating along with the rocker arm support 2, referring to fig. 4, that is, the rocker arm 1 moves left and right, so the abutting end of the rocker arm 1 drives the valve operating roller 11 to move left and right, in order to avoid the valve operating roller 11 from being separated from the end of the valve stem 16 when moving, the abutting platform 17 is provided on the valve stem 16, the abutting platform 17 has enough area to cover the moving range of the valve operating roller 11, thereby preventing the valve operating roller 11 from being separated from the abutting platform 17.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the above embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. An electrodeless variable lift valve rocker mechanism is characterized by comprising a rocker, a rocker support and a limiting component; the rocker arm comprises a butt joint end and a hinged end, a driving cam positioned between the butt joint end and the hinged end is in butt joint with the upper portion of the rocker arm, the butt joint end is in butt joint with a valve rod with a valve return spring and drives the valve rod to move axially, and the hinged end is hinged with the rocker arm support and drives the rocker arm support to rotate; the rocker arm support is provided with an elastic resetting component which enables the rocker arm support to return in a rotary mode, and the elastic resetting component is compressed before the valve resetting spring when the rocker arm is stressed; the limiting component is positioned on the rotation path of the rocker arm support and used for changing the rotation end point of the rocker arm support.

2. The electrodeless variable lift valve rocker mechanism of claim 1, comprising a rotating shaft, wherein the rocker support is sleeved on the rotating shaft, and axial limit blocks attached to two sides of the rocker support are fixed on the rotating shaft.

3. The electrodeless variable lift valve rocker mechanism as defined in claim 2, wherein the axial stopper is provided with a shaft mounting hole, and the shaft is fixed in the shaft mounting hole by a fixing key.

4. The electrodeless variable lift valve rocker mechanism as defined in claim 3, wherein the stop member comprises a stop pin shaft mounted between the axial stop blocks on both sides of the rocker arm support, and the rotating shaft is rotated by an angle adjusting device.

5. The electrodeless variable lift valve rocker mechanism of claim 1 wherein the hinged end is hinged to the rocker arm support by a support pin.

6. The electrodeless variable lift valve rocker mechanism of claim 5 wherein the resilient return member comprises a support return spring, one end of the support return spring is fixed at a predetermined position and the other end is connected to the end of the rocker support remote from the support pin.

7. The electrodeless variable lift valve rocker mechanism of claim 1 wherein the rocker arm is a curved bar with a convex middle portion.

8. The stepless variable lift valve rocker mechanism of claim 7, characterized in that a cam action roller for abutting against the driving cam is arranged at the convex part in the middle of the bent rod.

9. The electrodeless variable lift valve rocker mechanism of claim 1 wherein the abutment end abuts the valve stem via a valve actuation roller.

10. The stepless variable lift valve rocker mechanism of claim 9, characterized in that the end of the valve stem is provided with an abutting platform for facilitating the abutting of the valve action roller.