CN108798822B - Continuous variable valve lift device of piston type internal combustion engine - Google Patents
Continuous variable valve lift device of piston type internal combustion engine Download PDFInfo
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- CN108798822B CN108798822B CN201810657422.4A CN201810657422A CN108798822B CN 108798822 B CN108798822 B CN 108798822B CN 201810657422 A CN201810657422 A CN 201810657422A CN 108798822 B CN108798822 B CN 108798822B
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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
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
A continuous variable valve lift device of a piston type internal combustion engine comprises a cylinder cover, a cam shaft, a cam, a hydraulic tappet and a valve, wherein the cam shaft is rotatably supported on the cylinder cover; one side surface of the lever is provided with a large arc surface; one end of the adjusting rod is in sliding contact with the large arc surface of the lever, and the other end of the adjusting rod is connected with the adjusting shaft; the adjusting shaft is rotatably supported on the cylinder cover and can rotate and drive the adjusting rod to swing, so that one end of the adjusting rod moves along the circumferential direction of the large arc surface; one end of the lever is in contact or indirect contact with the valve, the other end of the lever is in contact or indirect contact with the cam, and the valve and the cam are both positioned on one side of the lever, which is opposite to the large arc surface. The invention can not only realize the continuous change of the valve lift, but also realize the change of the valve lift to zero.
Description
Technical Field
The present invention relates to a valve lift apparatus of a piston type internal combustion engine, and more particularly, to a continuously variable valve lift apparatus of a piston type internal combustion engine.
Background
The lift of the opening of the intake valve and the exhaust valve of the traditional piston type internal combustion engine is fixed, so that the engine can be in the optimal valve distribution state only under a certain specific working condition, and when the working condition of the piston type internal combustion engine deviates from the specific working condition, the valve distribution of the piston type internal combustion engine is in an undesirable state.
The invention with the patent application number of CN200810218188.1 discloses a continuously variable valve lift device, and the technical scheme of the invention is as follows: the rocker arm mechanism comprises a threaded rod, a motor for driving the threaded rod to rotate, a tappet in threaded connection with the threaded rod, a rocker arm shaft movably connected with the tappet, a cam positioned above the rocker arm shaft, a rocker arm roller which interacts with the cam and is hinged with the rocker arm shaft, a valve driven by the rocker arm shaft, and a telescopic arm connected with the rocker arm roller, wherein a sliding groove movably connected with the top end of the tappet is formed in the rocker arm shaft, and the tappet moves in the sliding groove.
The working principle of the invention is as follows: the threaded rod is driven by the motor to rotate so as to drive the tappet in threaded connection with the threaded rod to transversely move, so that the position of a fulcrum of the lever is continuously changed, namely the lever ratio is continuously changed, and the lift of the valve is continuously changed.
It can be seen that although the invention can realize continuous change of the valve lift, the invention can not realize that the valve lift becomes zero, namely, the cylinder closing function can not be realized (when a multi-cylinder internal combustion engine works, the valve of one cylinder is in a closed state without circulating opening and closing, namely, the valve lift becomes zero, so that the cylinder does not participate in combustion work), thereby the displacement of the piston type internal combustion engine can not be changed according to the load.
Disclosure of Invention
The invention aims to provide a continuous variable valve lift device of a piston type internal combustion engine, which not only can realize the continuous change of the valve lift, but also can realize the change of the valve lift to zero.
The continuous variable valve lift device of the piston type internal combustion engine is realized by the following steps:
a continuous variable valve lift device of a piston type internal combustion engine comprises a cylinder cover, a cam shaft, a cam, a hydraulic tappet and a valve, wherein the cam shaft is rotatably supported on the cylinder cover;
one side surface of the lever is provided with a large arc surface;
one end of the adjusting rod is in sliding contact with the large arc surface of the lever, and the other end of the adjusting rod is connected with the adjusting shaft;
the adjusting shaft is rotatably supported on the cylinder cover and can rotate and drive the adjusting rod to swing, so that one end of the adjusting rod moves along the circumferential direction of the large arc surface;
one end of the lever is in contact or indirect contact with the valve, the other end of the lever is in contact or indirect contact with the cam, and the valve and the cam are both positioned on one side of the lever, which is opposite to the large arc surface;
when the convex part of the cam is not contacted with the lever, the axis of the large arc surface is superposed with the axis of the adjusting shaft;
the cross section of the guide shaft is circular, and the guide shaft penetrates through the lever along the parallel direction of the axis of the large arc surface;
the lever is also provided with a surface vertical to the axis of the large arc surface; the guide frame is arranged on the cylinder cover, a surface which is vertical to the axis of the adjusting shaft is arranged on the guide frame, and the surface is in contact with a surface which is vertical to the axis of the large arc surface on the lever and can slide relatively; the guide frame is also provided with a guide groove, one part of the guide shaft is arranged in the guide groove, the cylindrical surface of the guide shaft is contacted with two opposite side surfaces of the guide groove, and the guide shaft can move along the guide groove;
the homing spring is a tension spring, one end of the homing spring is connected with the lever, and the other end of the homing spring is connected with the cylinder cover.
The working principle of the continuous variable valve lift device of the piston type internal combustion engine is as follows: the camshaft is driven by a crankshaft of the piston type internal combustion engine to rotate through a transmission system and drives the cam to rotate, the cam pushes the lever to enable the lever to swing by taking the end part of the adjusting rod, which is contacted with the large arc surface, as a fulcrum, and the lever directly pushes the valve or pushes the valve through the hydraulic tappet to do reciprocating linear motion, so that the valve is circularly opened and closed;
the adjusting rod is driven to swing through the adjusting shaft, one end of the adjusting rod moves along the large arc surface, and the position of a fulcrum of the lever is changed accordingly, so that the lengths of a power arm and a resistance arm of the lever are changed, and the lift of the valve is changed accordingly;
when one end of the adjusting rod moves anticlockwise along the large arc surface, the power arm of the lever is continuously shortened, and the resistance arm of the lever is continuously lengthened, so that the lift of the valve is continuously increased; conversely, when one end of the adjusting rod moves clockwise along the large arc surface, the lift of the valve is continuously shortened;
when one end of the adjusting rod moves out of the large arc surface clockwise (namely, one end of the adjusting rod is separated from the lever), the cam still pushes the lever to continuously swing, but the lever cannot push the valve to do reciprocating linear motion due to the fact that the lever loses a fulcrum, namely, the valve lift is changed into zero, and therefore the cylinder closing function of the piston type internal combustion engine is achieved. Since the adjusting lever is separated from the lever when the cylinder is closed and a gap is generated between the adjusting lever and the lever, the lever continuously shaken may collide with the adjusting lever.
Furthermore, the adjusting rod is provided with a groove along the radial direction of the adjusting shaft, so that the adjusting rod is n-shaped;
the lever is provided with a groove along the length direction, the notch is positioned at one end of the lever contacted or indirectly contacted with the valve, and two opposite side surfaces of the groove are vertical to the axis of the large arc surface, contacted with the surface of the guide frame vertical to the axis of the adjusting shaft and can slide relatively. The lever in such a structure can simultaneously push two intake valves (or exhaust valves) on the same cylinder to do reciprocating linear motion.
Further, the continuous variable valve lift device of the piston type internal combustion engine further comprises a roller shaft and a roller, wherein the roller shaft is arranged at one end of the lever, which is close to the cam;
the roller is supported on the roller shaft and is coaxial with the roller shaft, the roller can rotate relative to the lever, and the roller is in rolling contact with the cam so as to reduce the friction force from the cam to the lever for transmission.
Furthermore, the homing spring is made of an elastic wire and is provided with two parallel elastic deformation units, one end of each elastic deformation unit is provided with a hanging rod, the other end of each elastic deformation unit is provided with a hook foot of an L-shaped structure, each hook foot comprises a transverse part and a vertical part which are vertically connected, and the whole homing spring is in a door shape.
Further, the continuous variable valve lift device of the piston type internal combustion engine further comprises a pin, and the pin is provided with an external thread;
the lever is also provided with a pin hole and a hook, the pin hole is arranged on the lever along the direction parallel to the axis of the large arc surface, the pin hole is provided with an internal thread matched with the external thread of the pin, and the pin is in threaded connection with the pin hole;
the hook is fixedly connected to the lever and suitable for hanging the hanging rod of the return spring, and the hanging rod hung in the hook is parallel to the axis of the pin hole.
The homing spring is connected with the hook of the lever through the hanging rod of the homing spring, and the pin can prevent the hanging rod from jumping out of the hook, so that the connection reliability of the homing spring and the lever is improved.
Furthermore, the continuous variable valve lift device of the piston type internal combustion engine further comprises a pressing plate, the pressing plate is provided with a bottom groove and two side grooves, the bottom groove is positioned on the bottom surface of the pressing plate, the two side grooves are respectively positioned on two opposite side surfaces of the pressing plate, and the bottom groove is respectively communicated with the two side grooves to jointly form a structure "
Shape; the pressing plate is also provided with a plurality of screw holes for installation;
the transverse part of the homing spring hook leg is arranged in the bottom groove of the pressing plate, and the vertical part of the hook leg is arranged in the side groove of the pressing plate;
the cylinder cover is provided with a groove suitable for embedding a pressing plate; the pressure plate is fixed in the groove by a screw.
The reset spring is connected with the cylinder cover through the pressure plate, the transverse part of a hook foot of the reset spring is firstly arranged in a bottom groove of the pressure plate, the vertical part of the hook foot is arranged in a side groove of the pressure plate, then the pressure plate and the hook foot of the reset spring are embedded into a groove of the cylinder cover together, and finally the pressure plate and the hook foot of the reset spring are fastened by a bolt fastener. The structure can improve the reliability of the connection between the return spring and the cylinder cover.
Further, two side surfaces of the guide groove, which are in contact with the guide shaft, are parallel and symmetrical to a plane containing the valve axis and parallel to the axis of the adjusting shaft;
a flange, a small arc surface and a large cylindrical surface are also arranged at one end of the lever, which is in contact with or indirect contact with the valve;
the guide shaft is arranged on the flange of the lever in a penetrating way;
the small arc surface is connected with the large arc surface in a tangent mode and is coaxial with the guide shaft;
the large cylindrical surface is coaxial with the guide shaft and is in contact with or indirectly contacts with the valve.
Furthermore, one end of the adjusting rod, which is in sliding contact with the large arc surface, is a small cylindrical surface, and the radius of the small cylindrical surface is equal to that of the small arc surface.
The working principle of the improved piston type internal combustion engine continuous variable valve lift device is as follows: when the small cylindrical surface of the adjusting rod moves clockwise along the large arc surface to a position coincident with the small arc surface (namely the axis of the small cylindrical surface is collinear with the axis of the small arc surface), the length of the resistance arm of the lever is equal to zero, at the moment, although the cam still pushes the lever to continuously shake, the lever cannot push the valve to do reciprocating linear motion, namely the valve lift is changed into zero, and therefore the cylinder closing function of the piston type internal combustion engine is achieved. Obviously, the adjusting rod does not disengage from the lever when the cylinder is closed, i.e. there is no gap between the adjusting rod and the lever, so that the lever, which is continuously rocking, does not collide with the adjusting rod.
The invention has the beneficial effects that: the device can not only realize the continuous change of the valve lift, but also realize the change of the valve lift to zero, thereby realizing the cylinder closing function of the piston type internal combustion engine. In addition, this device is not affected by the valve opening and closing operation when continuously changing the valve lift, that is, the valve opening and closing transmission does not interfere with the transmission for continuously changing the valve lift. The valve lift may be continuously changed, or even changed to zero, whether the valve is in a closed state, an open state, while open, or while closed.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a front view of a continuously variable valve lift apparatus of a reciprocating internal combustion engine of the present invention;
FIG. 2 is an isometric view of the present invention with the cylinder head, hydraulic lifter, valve spring, and homing spring omitted for clarity;
FIG. 3 is an isometric view of the present invention showing the structure of the adjustment lever with a slot along the radial direction of the adjustment shaft and the lever with a slot along its length, with the cylinder head, hydraulic lifter, valve spring and return spring omitted for clarity;
FIG. 4 is an isometric view of the present invention showing the construction of the present invention further including roller shafts, rollers, and cylinder heads, hydraulic lifters, valves, valve springs, and return springs omitted for clarity;
FIG. 5 shows the structure of the return spring;
FIG. 6 shows the structure of the platen;
fig. 7 shows a structure in which the return spring is connected to the lever and the cylinder head, showing that the lever is provided with a small arc surface, a large cylindrical surface, a flange, and a guide shaft provided on the flange, showing the position of the guide groove, and omitting the adjustment lever and the adjustment shaft for the sake of simplicity;
FIG. 8 isbase:Sub>A cross-sectional view A-A of FIG. 7 showing the attachment of the return spring to the lever and cylinder head;
fig. 9 shows that the radius of the small cylindrical surface of the adjustment lever is equal to the radius of the small arc surface. The two-dot chain line in the figure expresses that the small cylindrical surface of the adjusting rod slides to the position which is coincident with the small arc surface;
fig. 10 is a sectional view taken along line B-B of fig. 9, showing a structure in which a guide shaft is provided on a flange of a lever, and showing a structure in which the lever simultaneously pushes two intake valves (or exhaust valves) on the same cylinder, and an adjustment lever and an adjustment shaft are omitted for clarity.
In the figure: the hydraulic tappet comprises a cylinder cover 1, a camshaft 2, a cam 3, a hydraulic tappet 4, a valve 5, a lever 6, a large arc surface 61, a hook 62, a pin hole 63, a small arc surface 64, a large cylindrical surface 65, a flange 66, an adjusting rod 7, a small cylindrical surface 71, an adjusting shaft 8, a guide shaft 9, a guide frame 10, a guide groove 101, a homing spring 11, an elastic deformation unit 111, a hanging rod 112, a hook foot 113, a roller shaft 12, a roller 13, a pin 14, a pressure plate 15, a bottom groove 151, a side groove 152, a screw hole 153, a valve spring 16 and a screw 17.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1, as shown in fig. 1 and 2:
a continuous variable valve lift device of a piston type internal combustion engine comprises a cylinder cover 1, a camshaft 2, a cam 3, a hydraulic tappet 4, a valve 5, a valve spring 16, a lever 6, an adjusting rod 7, an adjusting shaft 8, a guide shaft 9, a guide frame 10 and a return spring 11;
a large arc surface 61 is arranged on one side surface of the lever 6;
one end part of the adjusting rod 7 is in sliding contact with the large arc surface 61 of the lever 6, and the other end of the adjusting rod 7 is connected with the adjusting shaft 8;
the adjusting shaft 8 is rotatably supported on the cylinder head 1, and the adjusting shaft 8 is driven by a motor or a hydraulic system to rotate and drive the adjusting rod 7 to swing, so that one end part of the adjusting rod 7 moves along the circumferential direction of the large arc surface 61;
one end of the lever 6 is in contact with or indirect contact with the valve 5 (fig. 1 only shows a structure that the lever 6 pushes the valve 5 through the hydraulic tappet 4, that is, the lever 6 is in indirect contact with the valve 5 through the hydraulic tappet 4, the lever 6 can directly push the valve 5, that is, the lever 6 is in direct contact with the valve 5, both structures do not hinder the implementation of the present invention and belong to the protection scope of the present patent), the other end of the lever 6 is in contact with or indirect contact with the cam 3 (that is, the lever 6 is in indirect contact with the cam 3 through the roller 13), and the valve 5 and the cam 3 are both located on the side of the lever 6 opposite to the large arc surface 61; the cam 3 is axially fixed to the camshaft 2, and the camshaft 2 is rotatably supported by the cylinder head 1;
when the convex part of the cam 3 is not in contact with the lever 6 (i.e. the cam 3 does not push the lever 6, and the lever 6 does not push the valve 5 to open), the axis of the large arc surface 61 coincides with the axis of the adjusting shaft 8;
the cross section of the guide shaft 9 is circular, and the guide shaft 9 penetrates through the lever 6 along the parallel direction of the axis of the large arc surface 61;
the lever 6 is also provided with a surface vertical to the axis of the large arc surface 61; the guide frame 10 is arranged on the cylinder cover 1, the guide frame 10 is provided with a surface vertical to the axis of the adjusting shaft 8, the surface is in contact with a surface vertical to the axis of the large arc surface 61 on the lever 6 and can slide relatively, and the lever 6 is positioned in the axis direction of the large arc surface 61; the guide frame 10 is further provided with a guide groove 101, a part of the guide shaft 9 is arranged in the guide groove 101, the cylindrical surface of the guide shaft 9 is contacted with two opposite side surfaces of the guide groove 101, and the guide shaft 9 can move along the guide groove 101; the lever 6 is limited to a specified position by the restraint of the guide frame 10 and the guide groove 101 on the lever 6, so that the lever 6 can only swing in a plane perpendicular to the axis of the large arc surface 61;
the homing spring 11 is a tension spring, one end of the homing spring 11 is connected with the lever 6, and the other end of the homing spring 11 is connected with the cylinder cover 1; when the cam 3 is rotated to the projection not contacting the lever 6, the lever 6 can also be kept in contact with the cam 3, the hydraulic lifter 4 or the valve 5 by the tension of the return spring 11.
The working principle of the continuous variable valve lift device of the piston type internal combustion engine is as follows: as shown in fig. 1 and fig. 2, the camshaft 2 is driven by a crankshaft of a piston internal combustion engine through a transmission system to rotate, and drives the cam 3 to rotate, the cam 3 pushes the lever 6, so that the lever 6 swings with an end of the adjusting rod 7 contacting with the large arc surface 61 as a fulcrum, and the lever 6 pushes the valve 5 to perform a reciprocating linear motion through the hydraulic tappet 4 (the lever 6 can also directly push the valve 5 to perform a reciprocating linear motion), thereby realizing the cyclic opening and closing of the valve 5; the adjusting shaft 8 drives the adjusting rod 7 to swing, so that one end of the adjusting rod 7 moves along the large arc surface 61, the position of a fulcrum of the lever 6 is changed, the lengths of a power arm and a resistance arm of the lever 6 are changed, and the lift range of the valve 5 is changed; when one end of the adjusting rod 7 moves along the large arc surface 61 anticlockwise, the power arm of the lever 6 is continuously shortened, the resistance arm is continuously lengthened, and therefore the lift of the valve 5 is continuously increased; conversely, when one end of the adjusting rod 7 moves clockwise along the large arc surface 61, the lift of the valve 5 is continuously shortened; when one end of the adjusting rod 7 moves out of the large arc surface 61 clockwise (i.e. one end of the adjusting rod 7 is separated from the lever 6), the cam 3 still pushes the lever 6 to continuously swing, but the lever 6 loses the fulcrum, so the valve 5 cannot be pushed by the lever 6 to do reciprocating linear motion, i.e. the lift of the valve 5 becomes zero, thereby realizing the cylinder closing function of the piston type internal combustion engine. Since the adjusting lever 7 is separated from the lever 6 when the cylinder is closed and a gap is generated between the adjusting lever 7 and the lever 6, the lever 6 which is continuously rotated may collide with the adjusting lever 7.
Example 2, as shown in fig. 3:
the adjusting rod 7 is provided with a groove along the radial direction of the adjusting shaft 8, so that the adjusting rod 7 is n-shaped;
the lever 6 is grooved along its length, with a notch at the end of the lever 6 in contact or indirect contact with the valve 5, so that the lever 6 is "U" shaped, with opposite sides perpendicular to the axis of the major arc surface 61, and in contact with and slidable relative to the surface of the guide 10 perpendicular to the axis of the adjustment shaft 8.
The lever 6 thus constructed can simultaneously push two intake valves (or exhaust valves) on the same cylinder to perform reciprocating linear motion (see fig. 10).
Example 3, as shown in fig. 4:
the continuous variable valve lift device of the piston type internal combustion engine further comprises a roller shaft 12 and a roller 13, wherein the roller shaft 12 is arranged at one end of the lever 6 close to the cam 3, and the axis of the roller shaft 12 is parallel to the axis of the camshaft 2;
the roller 13 is supported on the roller shaft 12, the roller 13 is coaxial with the roller shaft 12, the roller 13 can rotate relative to the lever 6, and the roller 13 is in rolling contact with the cam 3 to reduce the friction force transmitted from the cam 3 to the lever 6.
Example 4, as shown in fig. 5:
the homing spring 11 is made of an elastic steel wire and is provided with two parallel elastic deformation units 111, one end of each elastic deformation unit 111 is provided with a hanging rod 112, the other end of each elastic deformation unit 111 is provided with an L-shaped hook leg 113, each hook leg 113 comprises a transverse part and a vertical part which are vertically connected, and the whole homing spring 11 is in a door shape.
Example 5, as shown in fig. 7 and 8:
the continuous variable valve lift device of the piston type internal combustion engine further comprises a pin 14, wherein the pin 14 is provided with external threads;
the lever 6 is further provided with a pin hole 63 and a hook 62, the pin hole 63 is formed in the lever 6 along the direction parallel to the axis of the large arc surface 61, the pin hole 63 is provided with an internal thread matched with the external thread of the pin 14, and the pin 14 is in threaded connection with the pin hole 63;
the hook 62 is fixedly connected to the lever 6, the hook 62 is suitable for hanging the hanging rod 112 of the return spring 11, and the hanging rod 112 hung in the hook 62 is parallel to the axis of the pin hole 63.
The homing spring 11 and the lever 6 are connected by hanging the hanging rod 112 of the homing spring 11 into the hook 62 of the lever 6, and the pin 14 can prevent the hanging rod 112 of the homing spring 11 from jumping out of the hook 62 of the lever 6, so that the reliability of the connection between the homing spring 11 and the lever 6 is improved.
As shown in fig. 6, the continuous variable valve lift apparatus of the piston internal combustion engine further includes a pressure plate 15, the pressure plate 15 is provided with a bottom groove 151 and two side grooves 152, the bottom groove 151 is located on the bottom surface of the pressure plate 15, the two side grooves 152 are respectively located on two opposite side surfaces of the pressure plate 15, the bottom groove 151 is respectively communicated with the two side grooves 152 to form a structure "
Shape; the pressing plate 15 is also provided with a plurality of screw holes 153 for installation;
as shown in fig. 8, the horizontal portion of the hooking leg 113 of the homing spring 11 is disposed in the bottom groove 151 of the pressing plate 15 and the vertical portion of the hooking leg 113 is disposed in the side groove 152 of the pressing plate 15;
as shown in fig. 7 and 8, the cylinder head 1 is provided with a groove adapted to be fitted with a pressure plate 15; the pressure plate 15 is secured in the recess by screws 17 or other threaded fasteners.
As shown in fig. 7 and 8, the return spring 11 is connected to the cylinder head 1 through the pressure plate 15, the horizontal portion of the hooking leg 113 of the return spring 11 is first placed in the bottom groove 151 of the pressure plate 15, the vertical portion of the hooking leg 113 is placed in the side groove 152 of the pressure plate 15, the pressure plate 15 with the hooking leg 113 of the return spring 11 is then embedded into the groove of the cylinder head 1, and finally the cylinder head 1 is fastened by the bolt fastener. Such a structure can improve the reliability of the connection of the return spring 11 to the cylinder head 1.
Example 6, as shown in fig. 7, 9 and 10:
two side surfaces of the guide groove 101, which are in contact with the guide shaft 9, are parallel and symmetrical to a plane containing the axis of the valve 5 and parallel to the axis of the adjusting shaft 8;
a flange 66, a small arc surface 64 and a large cylindrical surface 65 are also arranged at one end of the lever 6, which is in contact with or indirect contact with the valve 5;
the guide shaft 9 is arranged on the flange 66 of the lever 6 in a penetrating way;
the small arc surface 64 is tangentially connected with the large arc surface 61 and is coaxial with the guide shaft 9;
the large cylindrical surface 65 is coaxial with the guide shaft 9 and is in contact or indirect contact with the valve 5.
As shown in fig. 9, one end of the adjusting rod 7 in sliding contact with the large arc surface 61 is a small cylindrical surface 71, and the radius of the small cylindrical surface 71 is equal to the radius of the small arc surface 64.
The working principle of the improved piston type internal combustion engine continuous variable valve lift device is as follows: as shown in fig. 9, when the small cylindrical surface 71 of the adjusting rod 7 moves clockwise along the large arc surface 61 to a position coinciding with the small arc surface 64 (i.e. the axis of the small cylindrical surface 71 is collinear with the axis of the small arc surface 64), the length of the resistance arm of the lever 6 is equal to zero, at this time, although the cam 3 still pushes the lever 6 to continuously swing, the lever 6 cannot push the valve 5 to make a reciprocating linear motion, i.e. the lift of the valve 5 becomes zero, thereby implementing the cylinder closing function of the piston internal combustion engine. Obviously, the adjusting rod 7 is not disengaged from the lever 6 when the cylinder is closed, i.e. there is no gap between the adjusting rod 7 and the lever 6, so that the lever 6, which is continuously rocking, does not collide with the adjusting rod 7.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, "cylinder head 1" should be understood broadly, and may have a concept including a head, a casing, a frame, a body, and the like.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature may be over, above or on the second feature including the first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (8)
1. The utility model provides a piston type internal-combustion engine continuous variable valve lift device, includes cylinder head (1), rotation support in camshaft (2) of cylinder head (1), axial link firmly in cam (3) of camshaft (2), hydraulic tappet (4), valve (5), its characterized in that: the device also comprises a lever (6), an adjusting rod (7), an adjusting shaft (8), a guide shaft (9), a guide frame (10) and a return spring (11);
a large arc surface (61) is arranged on one side surface of the lever (6);
one end of the adjusting rod (7) is in sliding contact with the large arc surface (61) of the lever (6), and the other end of the adjusting rod (7) is connected with the adjusting shaft (8);
the adjusting shaft (8) is rotatably supported on the cylinder cover (1), the adjusting shaft (8) can rotate and drive the adjusting rod (7) to swing, and one end of the adjusting rod (7) moves along the circumferential direction of the large arc surface (61);
one end of the lever (6) is in contact or indirect contact with the valve (5), the other end of the lever (6) is in contact or indirect contact with the cam (3), and the valve (5) and the cam (3) are both positioned on one side of the lever (6) opposite to the large arc surface (61);
when the convex part of the cam (3) is not contacted with the lever (6), the axis of the large arc surface (61) is superposed with the axis of the adjusting shaft (8);
the cross section of the guide shaft (9) is circular, and the guide shaft (9) penetrates through the lever (6) along the parallel direction of the axis of the large arc surface (61);
the lever (6) is also provided with a surface vertical to the axis of the large arc surface (61); the guide frame (10) is arranged on the cylinder cover (1), the guide frame (10) is provided with a surface vertical to the axis of the adjusting shaft (8), and the surface is in contact with a surface vertical to the axis of the large arc surface (61) on the lever (6) and can slide relatively; the guide frame (10) is further provided with a guide groove (101), one part of the guide shaft (9) is arranged in the guide groove (101), the cylindrical surface of the guide shaft (9) is in contact with two opposite side surfaces of the guide groove (101), and the guide shaft (9) can move along the guide groove (101);
the homing spring (11) is a tension spring, one end of the homing spring (11) is connected with the lever (6) and the other end is connected with the cylinder cover (1).
2. The apparatus for continuously variable valve lift of a reciprocating internal combustion engine according to claim 1, characterized in that the adjusting lever (7) is slotted in the radial direction of the adjusting shaft (8) so that the adjusting lever (7) is n-shaped;
the lever (6) is provided with a groove along the length direction, the notch is positioned at one end of the lever (6) which is in contact or indirect contact with the valve (5), and two opposite side surfaces of the groove are perpendicular to the axis of the large arc surface (61), are in contact with the surface of the guide frame (10) which is perpendicular to the axis of the adjusting shaft (8) and can slide relatively.
3. The reciprocating piston type internal combustion engine continuous variable valve lift apparatus according to claim 1, further comprising a roller shaft (12), a roller (13), the roller shaft (12) being provided at one end of the lever (6) near the cam (3);
the roller (13) is supported on the roller shaft (12) and is coaxial with the roller shaft (12), the roller (13) can rotate relative to the lever (6), and the roller (13) is in rolling contact with the cam (3).
4. The reciprocating piston engine continuous variable valve lift apparatus according to any one of claims 1 to 3, characterized in that the return spring (11) is made of one elastic wire and is provided with two juxtaposed elastic deformation units (111), a hanging rod (112) is provided at one end of the elastic deformation unit (111) and a hook leg (113) of L-shaped structure is provided at the other end, the hook leg (113) comprises a transverse portion and a vertical portion which are vertically connected, and the shape of the entire return spring (11) is in a shape of a 'door'.
5. The reciprocating piston internal combustion engine continuously variable valve lift apparatus as claimed in claim 4, characterized by further comprising a pin (14), the pin (14) being provided with an external thread;
the lever (6) is further provided with a pin hole (63) and a hook (62), the pin hole (63) is formed in the lever (6) in the direction parallel to the axis of the large arc surface (61), the pin hole (63) is provided with an internal thread matched with the external thread of the pin (14), and the pin (14) is in threaded connection with the pin hole (63);
the hook (62) is fixedly connected to the lever (6), the hook (62) is suitable for hanging the hanging rod (112) of the return spring (11), and the hanging rod (112) hung into the hook (62) is parallel to the axis of the pin hole (63).
6. The reciprocating piston internal combustion engine continuously variable valve lift apparatus according to claim 5, further comprising a pressure plate (15), wherein the pressure plate (15) is provided with a bottom groove (151) and two side grooves (152), the bottom groove (151) is located on the bottom surface of the pressure plate (15), and the two side grooves (15) are located on the bottom surface of the pressure plate (15)2) Are respectively positioned on two opposite side surfaces of the pressure plate (15), and the bottom groove (151) is respectively communicated with the two side grooves (152) to jointly form
Shaping; the pressing plate (15) is also provided with a plurality of screw holes (153) for installation;
the transverse part of the hook foot (113) of the homing spring (11) is arranged in the bottom groove (151) of the pressure plate (15) and the vertical part of the hook foot (113) is arranged in the side groove (152) of the pressure plate (15);
the cylinder cover (1) is provided with a groove suitable for embedding a pressure plate (15); the pressure plate (15) is fixed in the groove by a screw (17).
7. The reciprocating piston engine continuously variable valve lift apparatus according to claim 6, characterized in that the two sides of the guide groove (101) in contact with the guide shaft (9) are parallel and symmetrical to a plane containing the valve (5) axis and parallel to the adjustment shaft (8) axis;
a flange (66), a small arc surface (64) and a large cylindrical surface (65) are also arranged at one end of the lever (6) which is in contact with or indirect contact with the valve (5);
the guide shaft (9) is arranged on a flange (66) of the lever (6) in a penetrating way;
the small arc surface (64) is tangentially connected with the large arc surface (61) and is coaxial with the guide shaft (9);
the large cylindrical surface (65) is coaxial with the guide shaft (9) and is in contact with the valve (5) or in indirect contact with the valve.
8. The piston internal combustion engine continuously variable valve lift apparatus according to claim 7, characterized in that an end of the adjusting rod (7) in sliding contact with the large arc surface (61) is a small cylindrical surface (71), and a radius of the small cylindrical surface (71) is equal to a radius of the small arc surface (64).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810657422.4A CN108798822B (en) | 2018-06-25 | 2018-06-25 | Continuous variable valve lift device of piston type internal combustion engine |
| PCT/CN2018/116928 WO2020000885A1 (en) | 2018-06-25 | 2018-11-22 | Continuously variable valve lift device for piston internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810657422.4A CN108798822B (en) | 2018-06-25 | 2018-06-25 | Continuous variable valve lift device of piston type internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108798822A CN108798822A (en) | 2018-11-13 |
| CN108798822B true CN108798822B (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810657422.4A Active CN108798822B (en) | 2018-06-25 | 2018-06-25 | Continuous variable valve lift device of piston type internal combustion engine |
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| Country | Link |
|---|---|
| CN (1) | CN108798822B (en) |
| WO (1) | WO2020000885A1 (en) |
Families Citing this family (2)
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|---|---|---|---|---|
| CN108798822B (en) * | 2018-06-25 | 2023-04-18 | 常州机电职业技术学院 | Continuous variable valve lift device of piston type internal combustion engine |
| CN117072332B (en) * | 2023-10-13 | 2024-01-16 | 龙口中宇热管理系统科技有限公司 | Engine control method and system with full variable valve function and cylinder closing function |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429882A (en) * | 2008-12-12 | 2009-05-13 | 奇瑞汽车股份有限公司 | Continuous variable air valve lift apparatus |
| CN101900003A (en) * | 2010-07-20 | 2010-12-01 | 奇瑞汽车股份有限公司 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
| CN101968000A (en) * | 2010-09-27 | 2011-02-09 | 奇瑞汽车股份有限公司 | Continuous variable valve lift device and gas distribution mechanism with device |
| CN201874632U (en) * | 2010-04-29 | 2011-06-22 | 朱譞晟 | Fully variable valve timing gear containing variable-speed swing mechanism |
| CN104612777A (en) * | 2015-02-06 | 2015-05-13 | 西华大学 | Consecutive variable valve timing device |
| CN208431041U (en) * | 2018-06-25 | 2019-01-25 | 常州机电职业技术学院 | Internal-combustion piston engine continuous variable air valve lift apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009091943A (en) * | 2007-10-05 | 2009-04-30 | Honda Motor Co Ltd | Valve opening characteristic variable type internal combustion engine |
| JP2010236362A (en) * | 2009-03-30 | 2010-10-21 | Isuzu Motors Ltd | Variable valve train and internal combustion engine using the same |
| CN103161543B (en) * | 2011-12-13 | 2017-09-05 | 常州嵘驰发动机技术有限公司 | Drive device, the internal combustion engine with the drive device and the vehicle using the internal combustion engine |
| CN104775866A (en) * | 2015-03-09 | 2015-07-15 | 常州嵘驰发动机技术有限公司 | Driving device for suction and exhaust valve of internal combustion engine |
| CN108798822B (en) * | 2018-06-25 | 2023-04-18 | 常州机电职业技术学院 | Continuous variable valve lift device of piston type internal combustion engine |
-
2018
- 2018-06-25 CN CN201810657422.4A patent/CN108798822B/en active Active
- 2018-11-22 WO PCT/CN2018/116928 patent/WO2020000885A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429882A (en) * | 2008-12-12 | 2009-05-13 | 奇瑞汽车股份有限公司 | Continuous variable air valve lift apparatus |
| CN201874632U (en) * | 2010-04-29 | 2011-06-22 | 朱譞晟 | Fully variable valve timing gear containing variable-speed swing mechanism |
| CN101900003A (en) * | 2010-07-20 | 2010-12-01 | 奇瑞汽车股份有限公司 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
| CN101968000A (en) * | 2010-09-27 | 2011-02-09 | 奇瑞汽车股份有限公司 | Continuous variable valve lift device and gas distribution mechanism with device |
| CN104612777A (en) * | 2015-02-06 | 2015-05-13 | 西华大学 | Consecutive variable valve timing device |
| CN208431041U (en) * | 2018-06-25 | 2019-01-25 | 常州机电职业技术学院 | Internal-combustion piston engine continuous variable air valve lift apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108798822A (en) | 2018-11-13 |
| WO2020000885A1 (en) | 2020-01-02 |
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