CN117167112A - Engine variable valve device capable of simultaneously changing lift of intake valve and exhaust valve - Google Patents
Engine variable valve device capable of simultaneously changing lift of intake valve and exhaust valve Download PDFInfo
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- CN117167112A CN117167112A CN202310931765.6A CN202310931765A CN117167112A CN 117167112 A CN117167112 A CN 117167112A CN 202310931765 A CN202310931765 A CN 202310931765A CN 117167112 A CN117167112 A CN 117167112A
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- rocker arm
- roller
- intake
- clamping groove
- exhaust
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- 238000009434 installation Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The engine variable valve device capable of changing the lift of the intake valve and the exhaust valve comprises an intake rocker arm, an exhaust rocker arm, a cam shaft and a driving cylinder, wherein the intake rocker arm is provided with a rocker arm roller, the rocker arm roller can slide on a roller shaft and is switched from one cam to the other cam, an intake rocker arm roller clamping groove and an exhaust rocker arm roller clamping groove are arranged on a piston rod of the driving cylinder, and the driving cylinder utilizes compressed air to simultaneously change the working position of the intake rocker arm roller and the exhaust rocker arm roller, so that the switching of the lift of two valves is realized. The invention has more compact structure, small space, low number of parts and low cost, and can be applied to small-displacement engines.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine variable valve device capable of simultaneously changing lift of an intake valve and an exhaust valve.
Background
The currently known variable valve technology of an engine is various, and various variable valve technologies realize the variation of valve lift or valve timing through different structural designs and control methods so as to enable the engine to obtain better performance or realize special functions, wherein one type of known variable valve technology adopts a structure of a sliding rocker roller, and the rocker roller is driven by a driving device to switch between two different cams so as to enable the engine to obtain two different valve lifts, thereby improving the engine performance or realizing a special function such as an engine braking function.
Chinese patent CN110080849A discloses a camshaft and valve driving device for an engine, according to the specification of the published application, two adjacent cams are provided on the camshaft of the device for a rocker arm, an actuator pushes a rocker arm roller to switch from one cam to another cam through a clamping groove, so as to realize a variable valve.
However, in practical applications, the space in the valve chamber of the engine is very limited, the distance between the cylinder centers of the two cylinders is small, and the arrangement of the roller driving cylinders is difficult, and in the disclosed technology, the structure of the driving cylinders is still not compact enough, especially for small and medium-sized engines, the driving cylinders for the intake and exhaust rocker arms cannot be arranged at the same time, so that the application of the variable valve device is limited.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the engine variable valve device capable of simultaneously changing the lift of the intake valve and the exhaust valve.
The engine variable valve device capable of changing lift of intake and exhaust valves comprises intake and exhaust rocker arms, a cam shaft and a driving cylinder, wherein the intake and exhaust rocker arms of the engine are provided with rocker arm rollers, the rocker arm rollers are rotatably arranged on roller shafts, the intake and exhaust rocker arms are provided with widened roller installation spaces, the rocker arm rollers can slide left and right on the roller shafts so that the rocker arm rollers are provided with first and second working positions, each cam shaft is provided with a first cam and a second cam adjacent to each rocker arm, the positions of the first cams correspond to the first working positions of the rocker arm rollers, the positions of the second cams correspond to the second working positions of the rocker arm rollers, the intake and exhaust rocker arms are driven by the first cams or the second cams respectively according to the different working positions of the rocker arm rollers, the driving cylinder comprises a cylinder body, a driving piston, a roller clamping groove, a reset spring and a spring holder, the driving piston is arranged in a cylinder hole of the driving cylinder, the driving piston is simultaneously provided with a rocker arm roller clamping groove and an exhaust clamping groove, the clamping groove is formed in the cylinder clamping groove and is connected with the piston clamping groove, and the piston is provided with the piston clamping seat.
Further, a guide structure is arranged on the air inlet roller clamping groove or the air outlet roller clamping groove, the guide structure is arranged on two sides of the clamping groove, guide grooves are arranged on the left side and the right side of the spring clamping seat, and the guide structure of the roller clamping groove is positioned in the guide groove of the spring clamping seat.
Further, the air inlet roller clamping groove and the air outlet roller clamping groove are provided with positioning holes, and the air inlet roller clamping groove and the air outlet roller clamping groove are fixed together through riveting or welding.
Preferably, a guide hole is formed in the air inlet roller clamping groove or the air outlet roller clamping groove, a guide rod is mounted on the driving cylinder, and the guide rod passes through the guide hole and is mounted on the cylinder body.
The beneficial effects of the invention are as follows: compared with the prior art, the engine variable valve device capable of simultaneously changing the lift of the intake valve and the exhaust valve provided by the invention adopts a single driving cylinder to simultaneously change the working positions of the intake rocker arm roller and the exhaust rocker arm roller, the driving cylinder has a more compact structure, the number of parts is less, the engine variable valve device is more suitable for a small-displacement engine, and the cost is lower.
Drawings
The drawings are included to provide a better understanding of the invention, and are used in conjunction with the following detailed description to describe and explain, but are not to be construed as limiting the invention. In the drawings of different embodiments or designs of the present specification, some parts have the same reference numerals, which merely denote parts that perform the same or similar functions, and do not necessarily mean the same parts or have the same structures, and the description of the drawings and the specification shall be taken to control. In the accompanying drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of a rocker arm of the present invention;
fig. 3 is a schematic view of the structure of the driving cylinder of the present invention;
FIG. 4 is a cross-sectional view of the drive cylinder of the present invention taken along the center of the cylinder bore;
FIG. 5 is a schematic view of the spring holder of the present invention;
FIG. 6 is a schematic view of the structure of the intake rocker roller card slot of the present invention;
FIG. 7 is a schematic view of an exhaust rocker roller card slot of the present invention;
FIG. 8 is a schematic view of the structure of the intake rocker roller card slot and exhaust rocker roller card slot of the present invention when they are secured together;
FIG. 9 is a schematic structural view of another design of the roller card slot guide of the present invention;
FIG. 10 is a schematic view of a roller card slot using guide rods for guiding in the present invention;
Detailed Description
In the description of the present invention, unless otherwise indicated, the terms "upper", "lower", "front", "rear", "left", "right", and the like are used for convenience in describing and explaining the present invention based on the orientation or positional relationship shown in the drawings, and are not to be construed as necessarily limiting the present invention, but rather as specific orientations or positional relationships of the device or elements in question.
For convenience of description, the term "intake and exhaust rocker arms" as used herein refers to intake and exhaust rocker arms of an engine.
Fig. 1 shows a schematic structure of an engine variable valve device for simultaneously changing lift of an intake valve and an exhaust valve, each cylinder of the engine is provided with an intake rocker arm and an exhaust rocker arm, the engine variable valve device for simultaneously changing lift of an intake valve and an exhaust valve comprises an intake rocker arm 1, an exhaust rocker arm 2, a cam shaft 3 and a driving cylinder 4, fig. 2 shows a structure of the intake rocker arm 1, the intake rocker arm 1 is provided with a rocker arm roller 11, the rocker arm roller 11 is rotatably arranged on a roller shaft 12, the intake rocker arm 1 is provided with a widened roller installation space, the rocker arm roller 11 can slide left and right on the roller shaft so that the rocker arm roller has a first working position and a second working position, and the exhaust rocker arm 2 has a similar structure to the intake rocker arm 1. The camshaft 3 is provided with a first cam 31 and a second cam 32 adjacent to each rocker arm, the position of the first cam 31 corresponds to the first working position of the rocker arm roller 11 and 21, the position of the second cam 32 corresponds to the second working position of the rocker arm roller 11 and 21, and the intake rocker arm and the exhaust rocker arm are respectively driven by the first cam 31 or the second cam 32 according to the different working positions of the rocker arm roller, so that the engine has two valve lifts and a variable valve is realized.
Fig. 3 and fig. 4 show a schematic structural diagram of a driving cylinder 4 according to the present invention, the driving cylinder includes a cylinder body 41, a driving piston 42, an intake rocker arm roller clamping groove 43, an exhaust rocker arm roller clamping groove 44, a return spring 45 and a spring holder 46, the driving piston 42 is installed in a cylinder hole of the cylinder body 41, the intake rocker arm roller clamping groove 43 and the exhaust rocker arm roller clamping groove 44 are installed on a piston rod of the driving piston 42 at the same time, a notch is provided at the lower ends of the intake rocker arm roller clamping groove 43 and the exhaust rocker arm roller clamping groove 44, the notches of the intake rocker arm roller clamping groove 43 and the exhaust rocker arm roller clamping groove 44 are respectively clamped on the intake rocker arm roller 11 and the exhaust rocker arm roller 21, the spring holder 46 is installed on the driving cylinder, as shown in fig. 5, the spring holder 46 is an elastic steel sheet with a U-shaped structure, two ends of the spring holder 46 are clamped in a fixing groove of the driving cylinder, two ends of the spring holder can be designed to be in a T-shaped structure, the fixing groove of the driving cylinder is also in a T-shaped structure, the fixing of the spring holder can be ensured to be fixed on the fixing seat, and the spring holder is firmly installed between the reset spring holder 45 and the spring holder 46.
Fig. 6 and fig. 7 show structures of an air intake rocker arm roller clamping groove 43 and an air exhaust rocker arm roller clamping groove 44, the air intake rocker arm roller clamping groove 43 and the air exhaust rocker arm roller clamping groove 44 can adopt stamping structural parts, guide structures 431 are arranged on the air intake roller clamping groove 43, the guide structures 431 are arranged on two sides of the clamping groove, guide grooves 461 are arranged on the left side and the right side of the spring clamping seat 46, as shown in fig. 5, the guide structures 431 of the roller clamping groove are positioned in the guide grooves 461 of the spring clamping seat, and the guide structures provide guidance for the roller clamping groove during the action of the roller clamping groove, so that the rotation of the roller clamping groove is avoided. Of course, the guiding structure of the roller clamping groove can also be arranged on the exhaust rocker arm roller clamping groove 44, and after the two roller clamping grooves are fixed on the piston rod, the guiding structure of any part can simultaneously provide guiding for the two roller clamping grooves.
In addition, in order to ensure that the two roller clamping grooves have correct relative positions during assembly, positioning holes 432 and 442 are formed in the air inlet roller clamping groove 43 and the air outlet roller clamping groove 44, and the air inlet roller clamping groove 43 and the air outlet roller clamping groove 44 are fixed together through riveting or welding, and fig. 8 shows a structure when the two roller clamping grooves are fixed together.
Fig. 9 and 10 show another embodiment of the invention for guiding the roller clamping groove, wherein a guiding hole 431 is arranged on the air inlet roller clamping groove or the air outlet roller clamping groove, a guiding rod 47 is arranged on the driving cylinder, and the guiding rod 47 is arranged on the cylinder body through the guiding hole 431.
The driving cylinder is provided with an air inlet 411, as shown in fig. 3, the air inlet of the cylinder is connected with the compressed air of the vehicle through a pipeline, and a switch (the pipeline and the electromagnetic valve are not shown) for controlling the compressed air by an electromagnetic valve is also arranged on the pipeline. The working process of the invention is as follows: when the electromagnetic valve is not electrified, the compressed air is closed, the driving cylinder does not work, the air inlet and outlet rocker arm roller is in the first working position and driven by the first cam 31 to operate, when the rocker arm roller needs to be switched to the second working position, the electromagnetic valve is electrified, the compressed air enters the driving cylinder to push the driving piston to extend, the air inlet rocker arm roller clamping groove 43 and the air outlet rocker arm roller clamping groove 44 simultaneously drive the air inlet and outlet rocker arm rollers 11 and 21 to be switched to the second working position, and the rocker arm roller is driven by the second cam 32 to operate, so that switching of two valve lifts is realized. When the rocker arm roller needs to return to the first working position, the electromagnetic valve is powered off, compressed air in the driving cylinder is released, and the air inlet and outlet rocker arm roller returns to the first working position under the driving of the reset spring 45. When the rocker arm roller is driven by the cam (the rocker arm roller is positioned at the cam lift part), the rocker arm roller can not be pushed by the driving cylinder at this moment due to the fact that the cam has larger acting force on the rocker arm roller, and only when the air inlet and outlet rocker arm roller 11 and 21 are positioned at the part where the first cam 31 and the second cam 32 are both base circles, no acting force exists between the cam and the rocker arm roller, the air inlet and outlet rocker arm roller 11 and 21 can be freely switched between two working positions, in practical application, the moment of powering on or powering off the electromagnetic valve can be determined according to the cam phase sensor signal, and the air inlet and outlet rocker arm roller starts to be switched when the air inlet and outlet rocker arm roller just enters the part where the first cam and the second cam are both base circles, so that the working reliability of the device is ensured.
It should be noted that the foregoing embodiments are merely preferred embodiments for illustrating the design and principles of the present invention, and are not to be construed as limiting the invention, and those skilled in the art to which the present invention pertains may still further modify the technical scheme described in the foregoing embodiments or replace and combine some of the technical features without departing from the spirit of the present invention, and these should be regarded as the scope of the present invention.
Claims (4)
1. The variable valve device of the engine capable of changing the lift of the intake valve and the exhaust valve simultaneously comprises an intake rocker arm, an exhaust rocker arm, a cam shaft and a driving cylinder, and is characterized in that: the engine intake and exhaust rocker arm is provided with a rocker arm roller, the rocker arm roller is rotatably arranged on a roller shaft, the intake and exhaust rocker arm is provided with a widened roller installation space, the rocker arm roller can slide left and right on the roller shaft so as to enable the rocker arm roller to be provided with a first working position and a second working position, each rocker arm on a cam shaft is provided with a first cam and a second cam which are adjacent, the position of the first cam corresponds to the first working position of the rocker arm roller, the position of the second cam corresponds to the second working position of the rocker arm roller, the intake and exhaust rocker arm is driven by the first cam or the second cam respectively according to the different working positions of the rocker arm roller, the driving cylinder comprises a cylinder body, a driving piston, a roller clamping groove, a reset spring and a spring clamping seat, a driving piston is arranged in a cylinder hole of the driving cylinder, the air intake rocker arm roller clamping groove and the exhaust rocker arm roller clamping groove are simultaneously arranged on a piston rod of the driving piston, the air intake rocker arm clamping groove and the exhaust rocker arm roller clamping groove is provided with a notch, the air intake spring clamping seat is arranged on the driving cylinder clamping seat is arranged on the two ends of the driving cylinder, and the air clamping seat is in the air cylinder clamping seat is in the compression spring clamping seat.
2. The variable valve device for an engine that simultaneously changes lift of an intake valve and an exhaust valve according to claim 1, characterized in that: the air inlet roller clamping groove or the air outlet roller clamping groove is provided with a guide structure, the guide structure is arranged on two sides of the clamping groove, the left side and the right side of the spring clamping seat are provided with guide grooves, and the guide structure of the roller clamping groove is positioned in the guide groove of the spring clamping seat.
3. The variable valve device for an engine that simultaneously changes lift of an intake valve and an exhaust valve according to claim 1, characterized in that: and positioning holes are formed in the air inlet roller clamping grooves and the air outlet roller clamping grooves, and the air inlet roller clamping grooves and the air outlet roller clamping grooves are fixed together through riveting or welding.
4. The variable valve device for an engine that simultaneously changes lift of an intake valve and an exhaust valve according to claim 1, characterized in that: the air inlet roller clamping groove or the air outlet roller clamping groove is provided with a guide hole, the driving cylinder is provided with a guide rod, and the guide rod passes through the guide hole and is arranged on the cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931765.6A CN117167112A (en) | 2023-07-27 | 2023-07-27 | Engine variable valve device capable of simultaneously changing lift of intake valve and exhaust valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931765.6A CN117167112A (en) | 2023-07-27 | 2023-07-27 | Engine variable valve device capable of simultaneously changing lift of intake valve and exhaust valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117167112A true CN117167112A (en) | 2023-12-05 |
Family
ID=88940232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310931765.6A Pending CN117167112A (en) | 2023-07-27 | 2023-07-27 | Engine variable valve device capable of simultaneously changing lift of intake valve and exhaust valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117167112A (en) |
-
2023
- 2023-07-27 CN CN202310931765.6A patent/CN117167112A/en active Pending
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