CN115111020B - Stepless variable lift valve rocker mechanism - Google Patents
Stepless variable lift valve rocker mechanism Download PDFInfo
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- CN115111020B CN115111020B CN202210765966.9A CN202210765966A CN115111020B CN 115111020 B CN115111020 B CN 115111020B CN 202210765966 A CN202210765966 A CN 202210765966A CN 115111020 B CN115111020 B CN 115111020B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 36
- 230000009471 action Effects 0.000 claims description 15
- 230000008859 change Effects 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a stepless variable lift valve rocker mechanism, which belongs to the technical field of engine valve timing mechanisms and comprises a rocker, a rocker support and a limiting member; the rocker arm comprises an abutting end and a hinging end, a driving cam positioned between the abutting end and the hinging end is abutted above the rocker arm, the abutting end abuts against a valve rod with a valve return spring and drives the valve rod to axially move, and the hinging 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 reset member for enabling the rocker arm support to rotate and reset, and the elastic reset member is compressed before the valve reset 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. The mode and the geometric principle of the valve lift adjusting device are different from the prior art, and the valve lift can be changed without affecting the working precision of the driving cam and the rocker arm by changing the rotation end point of the rocker arm support and changing the swing amplitude of the rocker arm so as to change the maximum axial displacement distance of the valve rod.
Description
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 valve actuating mechanism of the engine is an actuating mechanism which is responsible for providing air required by fuel oil combustion for a cylinder and exhausting 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, wherein the valve seat is provided with a valve channel communicated with a side wall and a bottom end, the upper part of the valve seat is provided with a spring groove, the lower end of the spring groove is provided with a valve rod through hole communicated with the valve channel, the valve rod extends into the valve channel through the valve rod through hole, the end head of the valve rod is provided with a plug capable of closing the opening of the lower end of the valve channel, the spring groove is internally provided with a valve return spring capable of resetting the valve rod, and the rocker mechanism drives the valve rod to reciprocate, so that the air inlet and exhaust processes of the valve channel can be realized. In terms of working principle, the main function of the valve mechanism is to open and close the inlet valve and the exhaust valve of the cylinder according to a certain time limit, so that the whole process of ventilation and replenishment of the engine cylinder is realized. The set of actions of air intake and air exhaust can be regarded as the process of human body inhalation and exhalation, the valve channel of the engine is better than the lips, and the opening size and the opening time of the lips determine the flow of air in and out. The greater the angle at which the lips open, the longer the time to open, the greater the flow in and out, and vice versa. The same rationale is used on engines, creating the concept of valve lift and timing. Valve lift is just like the angle at which the lips are open, and valve timing is just like the time at which the lips are open. In terms of three-dimensional thinking, the angle plus time is the size of a space, and it also determines the amount of air intake and exhaust in a unit time. The variable valve timing technology almost becomes the standard configuration of the current engine, and in order to further explore the potential of the traditional internal combustion engine, engineering personnel develop the variable valve lift technology on the basis of the variable valve timing technology, and when the variable valve timing 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. And the fuel consumption level is reduced while the power is improved.
The variable valve lift technique can be matched with proper valve lift at different engine speeds, so that torque is full at low speeds and horsepower is high at high speeds. The system uses smaller valve lift at low rotation speed, which is beneficial to increasing turbulence in a cylinder to improve combustion speed and low-speed torque of an engine, and uses larger valve lift at high rotation speed to obviously improve air inflow and further improve power output at high rotation speed. The current methods for achieving variable valve lift mainly include the following typical application modes: honda i-VTEC technology, BMW Valvetronic technology, and Japanese VVEL technology. But the Honda i-VTEC technique is a two-stage variable valve lift system that is not continuously adjustable. The Valvetronic technology of BMW has complex mechanism and large occupied space. The VVEL technology of daily products is a continuously adjustable variable valve lift system, but the added mechanism occupies larger space, and more friction pairs consume more power.
In order to solve the problems, the patent number is 201610373993.6, and the patent name is 'stepless variable lift valve rocker mechanism and corresponding valve device', and the valve rocker mechanism which has a simple structure and can realize stepless adjustment of the valve lift 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 reset 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 reset tension spring is connected with the connecting rod, and the other end 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 assembly; 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 the external teeth of the worm wheel. The turbine is provided with a second eccentric hole, and the first eccentric hole and the second eccentric Kong Jun are connected with the crankshaft. 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 unfolding length of the crank connecting rod, namely the fluctuation range of the middle pivot of the rocker arm, is controlled, and further the fluctuation of the valve lift is realized by changing the fluctuation range of the rocker arm around the middle pivot under the pushing of the cam. However, the above patent has a great problem that the driving precision of the rocker arm is affected when stepless adjustment is performed during the working process of the rocker arm. The specific reasons are as follows: at this time I or me firstly assumes that the rocker arm is in an inactive state, when the worm changes the rotation angle of the turbine, the positions of the first eccentric hole and the second eccentric hole are changed, and the whole rocker arm moves upwards or downwards, so that it is not difficult to think that if the connecting rod is not fixed in a certain position and is not moved, the connecting rod is influenced by the change of the first eccentric hole and the second eccentric hole in the adjusting process, and also moves upwards or downwards, but only the connecting rod reset tension spring is arranged in the above patent to pull the connecting rod, so that the connecting rod is ensured to be stable in a certain position in the adjusting process, but in fact, the connecting rod reset tension spring only is difficult to ensure that the connecting rod does not move at all, and the connecting rod can shake repeatedly, and finally the rocker arm shakes along with the connecting rod, so that the setting mode of the above patent has no problem, and once the rocker arm is in an active state, the shaking problem caused by stepless adjustment of the rocker arm is seriously influenced, and the driving precision of the rocker arm is finally influenced, and the precision of the valve lift is influenced.
Disclosure of Invention
The invention aims to solve the technical problems and provide the stepless variable lift valve rocker mechanism, when the valve lift is regulated, the regulating mode and the geometric principle adopted by the valve rocker mechanism are different from those of the traditional regulating mode, the maximum rotation angle of the rocker arm support is changed by changing the rotation end point of the rocker arm support, the swing amplitude of the rocker arm, particularly the swing amplitude of the abutting end, and finally the maximum distance of the axial displacement of the valve stem is changed, so that the valve lift can be changed on the premise of not influencing the normal operation of a driving cam and the rocker arm, the change of the rotation speed of an engine is responded timely, and the practicability is higher.
In order to achieve the above object, the present invention provides the following solutions: the invention discloses a stepless variable lift valve rocker mechanism, which comprises a rocker arm, a rocker arm support and a limiting member, wherein the rocker arm support is provided with a rocker arm support seat; the rocker arm comprises an abutting end and a hinging end, a driving cam positioned between the abutting end and the hinging end is abutted above the rocker arm, the abutting end abuts against a valve rod with a valve return spring and drives the valve rod to axially move, and the hinging end is hinged with the rocker arm support and drives the rocker arm support to rotate; an elastic reset member for enabling the rocker arm support to rotate and reset is arranged on the rocker arm support, and the elastic reset member is compressed before the valve reset spring when the rocker arm is stressed; the limiting member is located on the rotation path of the rocker arm support and used for changing the rotation end 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 member 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 the angle adjusting device.
Preferably, the hinged end is hinged with the rocker arm support through a support pin shaft.
Preferably, the elastic reset member 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 outer convex part of the middle part of the bent rod.
Preferably, the abutment end abuts against the valve stem through a valve action roller.
Preferably, the end head of the valve rod is provided with an abutting platform which is convenient for the valve action roller to abut.
Compared with the prior art, the invention has the following technical effects:
1. The invention provides a stepless variable lift valve rocker mechanism, which has an adjusting mode and a geometric principle which are completely different from those of a traditional valve structure for realizing continuous adjustment of valve lift, can ensure that the lift and shape of a driving cam are unchanged, the opening and closing time of a valve is unchanged from the phase relation of the valve rocker mechanism, and can realize stepless adjustment of the valve lift by adjusting the stepless variable lift valve rocker mechanism; when the valve lift is regulated, the valve lift can be regulated no matter what motion state the rocker arm, the driving cam and the rocker arm support are in, namely the valve lift can be regulated, the valve lift can be changed in the motion process of the rocker arm driving valve rod, the driving precision of the rocker arm is not influenced, the rotating speed of the engine can be responded and matched timely, and the valve lift can be changed according to the different rotating speeds of the engine.
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. The limiting pin shaft 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 rotation path of the rocker arm support can be changed only by changing the initial angle of the rotating shaft, so that the rotation 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 is abutted with the valve stem through the valve action roller, so that the friction resistance between the valve stem and the rocker arm can be effectively reduced, and the rocker arm can drive the valve stem more smoothly.
6. According to the invention, the abutting platform is arranged at the end of the valve rod, and has a sufficient area, so that the moving range of the valve action roller can be covered, and then the valve action roller can be prevented from being separated from the valve rod when moving in the horizontal direction due to 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 of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a configuration of a stepless variable lift valve rocker mechanism;
FIG. 2 is a partial side view of a stepless variable lift valve rocker mechanism;
FIG. 3 is a top perspective view of the rocker arm mount;
FIG. 4 is a schematic illustration of the effect of a stepless variable lift valve rocker mechanism on valve lift variation;
FIG. 5 is a schematic illustration of a valve opening magnitude curve for operation of a stepless variable lift valve rocker mechanism.
Reference numerals illustrate: 1. a rocker arm; 2. a rocker arm support; 3. a driving cam; 4. a rotating shaft; 5. an axial limiting block; 6. a fixed key; 7. limiting pin shafts; 8. the support pin shaft; 9. a support return spring; 10. cam action rollers; 11. a valve action 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 (5) plugging.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment discloses a stepless variable lift valve rocker mechanism, which is shown in fig. 1 to 5, and comprises a rocker arm 1, a rocker arm support 2 and a limiting member; the rocker arm 1 comprises a hinged end and an abutting end, the hinged end is hinged with the rocker arm support 2, the abutting end is abutted with a valve rod 16 on a valve seat 12, a valve channel 13 which is communicated with the side wall and the bottom end of the valve rod is arranged on the valve seat 12, a spring mounting groove 14 is formed in the upper portion of the valve seat 12, a valve rod through hole which is communicated with the valve channel 13 is formed in the lower end of the spring mounting groove 14, the valve rod 16 stretches into the valve channel 13 through the valve rod through hole, a plug 18 which can seal the opening of the lower end of the valve channel 13 is arranged at the end head of the valve rod 16, and a valve return spring 15 which can enable the valve rod 16 to return is arranged in the spring mounting groove 14. The driving cam 3 is abutted above the rocker arm 1, the driving cam 3 is located between the abutting end and the hinging end of the rocker arm 1, the driving cam 3 can keep rotating in situ, so that the rocker arm 1 is pushed to move in a contact mode, when the rocker arm 1 moves, the hinging end of the rocker arm 1 can drive the rocker arm support 2 to keep rotating in situ, and the abutting end of the rocker arm 1 can drive the valve rod 16 to move along the axial direction of the valve rod. The rocker arm support 2 is provided with an elastic reset member, the elastic reset member can enable the rocker arm support 2 after rotation to rotate and reset, the elasticity of the elastic reset member is smaller than that of the valve reset spring 15, so when the rocker arm 1 is driven by the driving cam 3, the elastic reset member is compressed before the valve reset spring 15, the hinged end of the rocker arm 1 moves first and drives the rocker arm support 2 to rotate, and at the moment, the abutting end of the rocker arm 1 cannot press the valve rod 16 because the valve reset spring 15 is not compressed, and the valve rod 16 is kept motionless; the limiting component is located on the autorotation path of the rocker arm support 2, when the rocker arm support 2 is driven by the hinged end of the rocker arm 1 to conduct autorotation motion, the rocker arm support 2 can be blocked by the limiting component when rotating to a certain position of the autorotation path and cannot continue to move, then the valve return spring 15 which is not compressed originally starts to be compressed, and the valve rod 16 which is kept motionless originally starts 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, then 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 movement amplitude of the abutting end of the rocker arm 1 is changed, so that the maximum movement distance of the valve rod 16 in the axial direction is changed, and the lift of the valve rod 16 is changed. Specific correspondence relation: 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 stem 16 is increased, and the valve lift is increased.
The stepless variable lift valve rocker mechanism adjusts the lift process of an engine valve and the principle is as follows:
when the driving cam 3 rotates (the rotation direction of the driving cam 3 is opposite to the rotation direction of the rocker arm support 2, as shown in fig. 4), the elevation 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 larger than that of the return member, the valve rod 16 does not move, and at the moment, the lower rocker arm support 2 is driven by the hinged end of the rocker arm 1 to start rotating, namely the hinged end of the rocker arm 1 and the rocker arm support 2 move together, and the center distance between the hinged point of the hinged end of the rocker arm 1 and 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 member, the position of the hinged end of the rocker arm 1 is fixed at the moment because the stop rocker arm support 2 of the limiting member stops rotating, and then the center distance between the hinged end of the rocker arm 1 and the cam 1 can not be increased any more, and the center distance reaches the maximum value. After the point, the rest elevation of the cam 1 pushes the abutting end of the rocker arm 1 to drive the valve rod 16 to compress the valve return spring 15, the valve rod 16 moves downwards along the axial direction and opens the opening at the lower end of the valve channel 13, so that the valve is opened; it can be seen that the amplitude of the valve opening, i.e. the maximum distance of the axial downward movement of the valve stem 16, depends on the maximum distance that can be reached between the hinged end of the rocker arm 1 and the driving cam 3, and how much the maximum centre distance that can be reached between the hinged end of the rocker arm 1 and the driving cam 3 depends on how much the maximum angle that the rocker arm holder 2 can rotate, i.e. the smaller the maximum angle of rotation of the rocker arm holder 2, the smaller the maximum distance that can be reached between the hinged end of the rocker arm 1 and the driving cam 3, and the greater the maximum distance of the axial downward movement of the valve stem 16, the greater the amplitude of the valve opening, and vice versa the smaller the valve lift. Therefore, the maximum rotation angle of the rocker arm support 2 can be adjusted by adjusting the position of the limiting member on the rotation path of the rocker arm support 2, the opening amplitude of the valve can be adjusted steplessly, and the valve lift is changed. Referring to fig. 5, a curve of the valve opening variation of the valve rocker mechanism at different maximum angles of rotation set by the rocker arm holders 2 is shown;
When the driving cam 3 rotates at the extreme point of the elevation, the elevation is continuously reduced, the valve rod 16 gradually rebounds under the action of the valve return spring 15 to drive the rocker arm 1 to swing reversely, at this time, the swinging power of the rocker arm 1 is converted into the valve return spring 15 and an elastic return member by the driving cam 3, the elastic return member starts to pull the rocker arm support 2 out of the dead point position (namely away from the limit member), and the rocker arm 1 returns to the initial position along with the continuous reduction of the elevation of the driving cam 3.
The position change of the limiting member on the rotation 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; the lift of the overhead driving cam 3 is unchanged when the valve rocker mechanism operates no matter how the angle of the maximum rotation angle of the rocker arm support 2 is adjusted, and the phase relation between the driving cam 3 and the rocker arm 1 is unchanged when the valve rocker mechanism operates no matter how the angle of the maximum rotation angle of the rocker arm support 2 is adjusted, so that the angle adjustment of the maximum rotation angle of the rocker arm support 2, namely the adjustment of the valve lift, can be performed no matter whether the rocker arm 1 and the driving cam 3 are in a stop state or in a motion state.
In this embodiment, as shown in fig. 1 to 5, the rocker arm support 2 is sleeved on the rotating shaft 4, two axial limiting blocks 5 are fixed on the rotating shaft 4, and the two axial limiting blocks 5 are respectively arranged on two sides of the rocker arm support 2 and are attached to the side wall of the rocker arm support 2 so as to limit the axial displacement of the rocker arm support 2 and prevent the rocker arm support 2 from rotating on the rotating shaft 4.
Further, in this embodiment, as shown in fig. 1 to 5, a shaft mounting hole is provided on the axial stopper 5, and the shaft 4 is fixed in the shaft mounting hole by a fixing key 6, so as to fix the axial stopper 5 and the shaft 4. After the fixed key 6 is taken out, the axial limiting block 5 can be quickly removed, so that the rocker arm support 2 is detached from the rotating shaft 4 to replace the new rocker arm support 2, and the maintenance is convenient.
In this embodiment, as shown in fig. 1 to 5, the limiting member includes a limiting pin 7, the limiting pin 7 is installed between two axial limiting blocks 5, when the rocker arm support 2 rotates, after the lower edge of the rocker arm support 2 contacts with the limiting pin 7, the rocker arm support 2 can be prevented from continuing to rotate under the blocking of the limiting pin 7. The rotating shaft 4 drives the rotating shaft 4 to rotate through an 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 rotating path of the rocker arm support 2. The angle adjusting means may be any type of means as long as the rotation angle of the rotation 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 shape of a drop 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 arm support 2 away from the support pin shaft 8. The rocker arm support 2 is always pulled by the support return spring 9, so that the rocker arm support 2 is provided with power for rotating and returning.
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 is abutted against the driving cam 3, one side fulcrum (that is, the hinged end of the rocker arm 1) is hinged with the support pin 8, and the other side fulcrum (that is, the abutted end of the rocker arm 1) is abutted against the valve stem 16.
Further, in the present embodiment, as shown in fig. 1 to 5, the cam action roller 10 is hinged to the middle outer convex portion (middle fulcrum) of the bent rod, 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, so that friction resistance can be effectively reduced, and smooth driving of the rocker arm 1 by the driving cam 3 can be ensured, compared with direct abutting of the rocker arm 1 against the driving cam 3.
Further, in the present embodiment, as shown in fig. 1 to 5, the valve operating roller 11 is hinged to the abutting end of the rocker arm 1 (i.e., the fulcrum on the abutting side of the bent lever to the valve stem 16), and the valve operating roller 11 abuts against the end of the valve stem 16, i.e., the rocker arm 1 abuts against the valve stem 16 by the valve operating roller 11, so that frictional resistance can be effectively reduced and smooth valve stem 16 of the rocker arm 1 can be ensured, as compared with the case where the rocker arm 1 abuts against the valve stem 16 directly.
Further, in the present embodiment, as shown in fig. 1 to 5, the end of the valve stem 16 is provided with an abutment platform 17 for facilitating the abutment of the valve roller 11, and since the rocker arm 1 moves horizontally as a whole when the rocker arm 1 rotates with the rocker arm holder 2, referring to fig. 4, the abutment end of the rocker arm 1 drives the valve roller 11 to move left and right, in order to avoid the valve roller 11 from moving away from the end of the valve stem 16, the valve stem 16 is provided with the abutment platform 17, and the abutment platform 17 has a sufficient area to cover the movement range of the valve roller 11, thereby preventing the valve roller 11 from moving away from the abutment platform 17.
The principles and embodiments of the present invention have been described with reference to specific examples, which are provided herein to assist in understanding the methods and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. The stepless variable lift valve rocker mechanism is characterized by comprising a rocker, a rocker support, a rotating shaft and a limiting member; the rocker arm comprises an abutting end and a hinging end, a driving cam positioned between the abutting end and the hinging end is abutted above the rocker arm, the abutting end abuts against a valve rod with a valve return spring and drives the valve rod to axially move, and the hinging 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 reset member for enabling the rocker arm support to rotate and reset, the elastic reset member is stretched before the valve reset spring when the rocker arm is stressed, and the limiting member is positioned on the rotation path of the rocker arm support and used for changing the rotation end point of the rocker arm support; 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; 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; the limiting member comprises limiting pin shafts arranged between the axial limiting blocks on two sides of the rocker arm support, and the rotating shaft rotates through an angle adjusting device; the hinged end is hinged with the rocker arm support through a support pin shaft.
2. The electrodeless variable lift valve rocker mechanism of claim 1, wherein the elastic return member comprises a support return spring having one end fixed at a predetermined position and the other end connected to an end of the rocker arm support remote from the support pin.
3. The electrodeless variable lift valve rocker mechanism of claim 1, wherein the rocker arm is a curved lever with a convex middle portion.
4. A stepless variable lift valve rocker mechanism according to claim 3, wherein the outer convex part of the middle part of the bent rod is provided with a cam action roller for abutting against the driving cam.
5. A stepless variable lift valve rocker mechanism as claimed in claim 1, wherein the abutment end abuts the valve stem via a valve operating roller.
6. The electrodeless variable lift valve rocker mechanism of claim 5, wherein the end head of the valve stem is provided with an abutment platform for facilitating abutment of the valve actuation roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210765966.9A CN115111020B (en) | 2022-06-30 | 2022-06-30 | Stepless variable lift valve rocker mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN115111020B true CN115111020B (en) | 2024-04-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2024972A1 (en) * | 1970-05-22 | 1971-12-02 | Volkswagenwerk Ag, 3180 Wolfsburg | Valve actuation for internal combustion engines |
| US5003939A (en) * | 1990-02-26 | 1991-04-02 | King Brian T | Valve duration and lift variator for internal combustion engines |
| CN103189604A (en) * | 2010-12-13 | 2013-07-03 | 川崎重工业株式会社 | Drive cam and valve operating device for engine |
| CN103334807A (en) * | 2013-06-03 | 2013-10-02 | 浙江亿日气动科技有限公司 | Electric engine braking actuation device provided with driving shaft |
| CN104105850A (en) * | 2012-02-10 | 2014-10-15 | 爱信精机株式会社 | Engine valve control mechanism |
| CN105683513A (en) * | 2013-10-25 | 2016-06-15 | 洋马株式会社 | Variable valve timing mechanism and engine with variable valve timing mechanism |
| CN105909332A (en) * | 2016-05-30 | 2016-08-31 | 苏立群 | Stepless valve rocker mechanism with variable lift and corresponding valve device |
| CN110374707A (en) * | 2019-06-19 | 2019-10-25 | 浙江吉利控股集团有限公司 | A kind of continuous variable lift device, engine and automobile |
| CN113027560A (en) * | 2021-04-09 | 2021-06-25 | 李雷夫 | Continuous variable valve lift control device and engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030121484A1 (en) * | 2002-01-03 | 2003-07-03 | Yushu Wang | Continuously variable valve timing, lift and duration for internal combustion engine |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2024972A1 (en) * | 1970-05-22 | 1971-12-02 | Volkswagenwerk Ag, 3180 Wolfsburg | Valve actuation for internal combustion engines |
| US5003939A (en) * | 1990-02-26 | 1991-04-02 | King Brian T | Valve duration and lift variator for internal combustion engines |
| CN103189604A (en) * | 2010-12-13 | 2013-07-03 | 川崎重工业株式会社 | Drive cam and valve operating device for engine |
| CN104105850A (en) * | 2012-02-10 | 2014-10-15 | 爱信精机株式会社 | Engine valve control mechanism |
| CN103334807A (en) * | 2013-06-03 | 2013-10-02 | 浙江亿日气动科技有限公司 | Electric engine braking actuation device provided with driving shaft |
| CN105683513A (en) * | 2013-10-25 | 2016-06-15 | 洋马株式会社 | Variable valve timing mechanism and engine with variable valve timing mechanism |
| CN105909332A (en) * | 2016-05-30 | 2016-08-31 | 苏立群 | Stepless valve rocker mechanism with variable lift and corresponding valve device |
| CN110374707A (en) * | 2019-06-19 | 2019-10-25 | 浙江吉利控股集团有限公司 | A kind of continuous variable lift device, engine and automobile |
| CN113027560A (en) * | 2021-04-09 | 2021-06-25 | 李雷夫 | Continuous variable valve lift control device and engine |
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| Publication number | Publication date |
|---|---|
| CN115111020A (en) | 2022-09-27 |
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