CN209800045U - variable valve mechanism - Google Patents
variable valve mechanism Download PDFInfo
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- CN209800045U CN209800045U CN201920418393.6U CN201920418393U CN209800045U CN 209800045 U CN209800045 U CN 209800045U CN 201920418393 U CN201920418393 U CN 201920418393U CN 209800045 U CN209800045 U CN 209800045U
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Abstract
The utility model belongs to the technical field of the internal-combustion engine, concretely relates to variable valve mechanism. The variable valve mechanism comprises a driving wheel and a driven wheel, wherein the driving wheel is connected to a crankshaft of the internal combustion engine, the driven wheel is connected to a camshaft of the internal combustion engine, the driving wheel and the driven wheel are driven through a flexible transmission assembly, a phase adjusting wheel and a tensioning wheel are arranged between the driving wheel and the driven wheel, the phase adjusting wheel is driven through a motor, and the tensioning wheel is driven through an elastic adjusting device. The beneficial effects are as follows: the crankshaft and the camshaft are driven by the flexible driving assembly, and compared with the traditional gear train driving, the gear train driving device is low in processing cost, simple in structure and convenient to assemble; the opening time and the closing time of the valve can be adjusted according to the requirements of different working conditions of the internal combustion engine, so that the dynamic property of the internal combustion engine at low rotating speed can be met, and the fuel economy of the internal combustion engine at high rotating speed can be met.
Description
Technical Field
The utility model belongs to the technical field of the internal-combustion engine, concretely relates to variable valve mechanism.
Background
In the internal combustion engine, power is generated and output by mixed combustion of fuel and air in a combustion chamber, and in operation, when air is sucked, an intake cam on a camshaft drives an intake valve to move, the intake valve is opened, and the air enters the combustion chamber. When air is to be discharged, an exhaust cam on the camshaft drives an exhaust valve to move, the exhaust valve opens, and the combusted mixture is discharged from the combustion chamber.
In the traditional internal combustion engine, a crankshaft drives a camshaft to rotate through gear train transmission, but the gear train transmission distance is short, and the gear train design is complex and the cost is high for the internal combustion engine with the overhead camshaft.
In an internal combustion engine, the opening and closing of a valve are greatly determined by a cam profile of a camshaft, the design of a cam motion profile is mainly determined by the rotating speed of each working condition of the engine and a balance value meeting comprehensive indexes, the performance of the cam motion profile can only meet the requirements of partial working conditions of the engine, such as low-load dynamic property or high-load fuel economy, and the opening and closing time of the valve cannot be adjusted according to the requirements of different working conditions.
SUMMERY OF THE UTILITY MODEL
the utility model discloses a remedy prior art's defect provides a simple structure, convenient assembling's variable valve mechanism.
The utility model discloses a realize through following technical scheme:
a variable valve mechanism comprises a driving wheel and a driven wheel, wherein the driving wheel is connected to a crankshaft of an internal combustion engine, the driven wheel is connected to a camshaft of the internal combustion engine, the driving wheel and the driven wheel are driven through a flexible transmission assembly, a phase adjusting wheel and a tension wheel are arranged between the driving wheel and the driven wheel, the phase adjusting wheel is driven through a motor, and the tension wheel is driven through an elastic adjusting device.
Furthermore, the driven wheel comprises an air inlet driven wheel and an air outlet driven wheel, the air inlet driven wheel, the air outlet driven wheel and the driving wheel are driven through flexible transmission assemblies, and a phase adjusting wheel and a tension wheel are arranged between the air inlet driven wheel and the driving wheel and between the air outlet driven wheel and the driving wheel and corresponding to the flexible transmission assemblies.
Further, the flexible transmission assembly is a synchronous belt or a chain.
Further, the tensioning wheel is arranged on the inner side or the outer side of the flexible transmission assembly through an elastic adjusting device.
Further, the phase adjusting wheel is positioned on the inner side or the outer side of the flexible transmission assembly.
Furthermore, a spring structure is arranged in the elastic adjusting device, and the spring structure is a compression spring or an extension spring.
Further, the phase adjustment wheel is driven by a hydraulic pump.
The utility model has the advantages that: the crankshaft and the camshaft are driven by the flexible driving assembly, and compared with the traditional gear train driving, the gear train driving device is low in processing cost, simple in structure and convenient to assemble; the opening time and the closing time of the valve can be adjusted according to the requirements of different working conditions of the internal combustion engine, so that the dynamic property of the internal combustion engine at low rotating speed can be met, and the fuel economy of the internal combustion engine at high rotating speed can be met.
Drawings
The present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a layout diagram of a variable valve train of an internal combustion engine;
FIG. 2 is a schematic diagram of the operation of a variable valve mechanism of an internal combustion engine;
FIG. 3 is a schematic diagram of a dual overhead camshaft dual synchronous belt variable valve mechanism of an internal combustion engine;
FIG. 4 is a schematic diagram of a dual overhead camshaft single synchronous belt variable valve mechanism of an internal combustion engine;
FIG. 5 is a schematic diagram of a modified design of a variable valve mechanism of an internal combustion engine;
FIG. 6 is a schematic view of a motor-driven phase adjustment wheel according to the principle;
FIG. 7 is a schematic diagram of a structural principle in which a phase adjustment wheel is driven in the form of a hydraulic pump;
Fig. 8 is a schematic structural diagram of the elastic adjusting device.
In the figure, a driving wheel 1, a driven wheel 2, a flexible transmission assembly 3, a phase adjustment wheel 4, a motor 5, a tension wheel 6, an elastic adjustment device 7, an air inlet driven wheel 8, an air outlet driven wheel 9, a telescopic sleeve 10, a gear 11 and a rack 12 are arranged.
Detailed Description
fig. 1-8 show an embodiment of the present invention. The utility model discloses a variable valve mechanism, include action wheel 1 and follow driving wheel 2, action wheel 1 connects at the bent axle of internal-combustion engine, connects at the camshaft of internal-combustion engine from driving wheel 2, and action wheel 1 and follow driving wheel carry out the transmission through flexible drive assembly 3 between 2, action wheel 1 and follow driving wheel are equipped with phase adjustment wheel 4 and take-up pulley 6 between 2, and phase adjustment wheel 4 passes through the drive of motor 5, and take-up pulley 6 drives through elasticity adjusting device 7.
Further, the driven wheel 2 comprises an air inlet driven wheel 8 and an air outlet driven wheel 9, the air inlet driven wheel 8, the air outlet driven wheel 9 and the driving wheel 1 are driven through the flexible transmission assembly 3, and the air inlet driven wheel 8, the air outlet driven wheel 9 and the driving wheel 1 are respectively provided with a phase adjustment wheel 4 and a tension wheel 6 corresponding to the flexible transmission assembly 3.
Further, the flexible transmission assembly 3 is a synchronous belt or a chain.
Further, the tension wheel 6 is arranged inside or outside the flexible transmission assembly 3 through an elastic adjusting device 7.
Further, the phase adjustment wheel 4 is located inside or outside the flexible transmission assembly 3.
Further, a spring structure is arranged inside the elastic adjusting device 7, and the spring structure is a compression spring or an extension spring.
Further, the phase adjustment wheel 4 is driven by a hydraulic pump.
The utility model relates to a variable valve mechanism, for the convenience of narration, flexible transmission assembly 3 is expressed in the form of adopting the hold-in range, phase place adjusting wheel 4 is installed on motor 5, motor 5 can drive phase place adjusting wheel 4 to move back and forth; the tensioning wheel 6 is arranged on the elastic adjusting device 7, a spring is arranged in the elastic adjusting device 7, and the elastic adjusting device 7 can drive the tensioning wheel 6 to move back and forth under the action of external force; the timing mark and the mounting and fixing position are respectively marked on the driving wheel 1 and the driven wheel 2, when the internal combustion engine is assembled, the timing mark of the driving wheel 1 is aligned with the mounting and fixing position, and the timing mark of the driven wheel 2 is aligned with the mounting and fixing position, so that the integral timing is accurate when the internal combustion engine is assembled; the phase adjusting wheel 4 arranged on the motor 5 is arranged at a preset position of the internal combustion engine, the tension wheel 6 arranged on the elastic adjusting device 7 is arranged at the preset position of the internal combustion engine, the spring force on the elastic adjusting device 7 and the tension force of the synchronous belt reach a balanced state, and at the moment, the tension force of the synchronous belt needs to be detected to be within a designed range.
when the internal combustion engine works, the opening and closing time of the valve can be adjusted according to the requirements of different working conditions, when the motor 5 drives the phase adjusting wheel 4 to move towards the arrow direction in the attached drawing 2, the tension force of the synchronous belt is increased, the tension force on the tension wheel 6 is larger than the spring force on the elastic adjusting device 7, the tension wheel 6 moves towards the arrow direction in the attached drawing 2, when the phase adjusting wheel 4 moves the distance of d1, the tension wheel 6 moves the distance of d2, at the moment, the length L1 of the synchronous belt on the side of the phase adjusting wheel 4 is lengthened, and the length L2 of the synchronous belt on the side of the tension wheel 6 is. The length of the synchronous belt on the side of the phase adjusting wheel 4 is increased, and the phase change angle of the driven wheel 2 is changed, so that the variable valve is adjusted:
According to the requirement of the working condition, when the motor 5 drives the phase adjusting wheel 4 to move towards the direction of the arrow in the attached drawing 2, the tension of the synchronous belt is reduced, the tension on the tension pulley 6 is smaller than the spring force on the elastic adjusting device 7, and the tension pulley 6 moves towards the direction of the arrow in the attached drawing 2. If the length of the timing belt on the side of the phase adjustment wheel 4 is reduced, the phase of the driven wheel 2 is changed by an angle, thereby realizing the adjustment of the variable valve.
Referring to fig. 6 and 7, the motor 5 may be an electric motor or a step motor, or other product structure that generates rotational motion, when the motor 5 drives the phase adjustment wheel 4 to perform front-back linear motion, the motor may be designed to be a rack-and-pinion structure, the motor drives the gear to perform rotational motion, the gear drives the rack to perform linear motion, the motor may also be designed to be a worm-and-gear structure, the motor drives the worm gear to perform rotational motion, and the worm gear drives the worm to perform linear motion.
The utility model discloses in, motor drive form also can be the variant and be the hydraulic pump drive form, through hydraulic pump piston both ends hydraulic pressure force's change, realizes the linear motion of piston to the piston drives linear motion around the phase adjustment wheel is done.
Referring to fig. 8, the tensioning wheel 6 is stretched or returned by a corresponding spring inside the elastic adjustment device 7 to the telescopic sleeve 10 connected to the tensioning wheel 6, the spring being located inside the telescopic sleeve 10.
The present invention is not limited to the above embodiments, and any person should learn to make under the teaching of the present invention and the present invention has the same or similar technical solution, and all fall into the protection scope of the present invention.
The technology, shape and construction parts which are not described in detail in the present invention are all known technology.
Claims (5)
1. The variable valve mechanism comprises a driving wheel and a driven wheel, and is characterized in that the driving wheel is connected to a crankshaft of an internal combustion engine, the driven wheel is connected to a camshaft of the internal combustion engine, the driving wheel and the driven wheel are driven through a flexible transmission assembly, a phase adjusting wheel and a tension wheel are arranged between the driving wheel and the driven wheel, the phase adjusting wheel is driven through a motor, and the tension wheel is driven through an elastic adjusting device.
2. The variable valve mechanism according to claim 1, characterized in that: the driven wheel comprises an air inlet driven wheel and an air outlet driven wheel, the air inlet driven wheel, the air outlet driven wheel and the driving wheel are driven through flexible transmission assemblies, and a phase adjusting wheel and a tension wheel are arranged between the air inlet driven wheel and the driving wheel and between the air outlet driven wheel and the driving wheel corresponding to the flexible transmission assemblies respectively.
3. A variable valve mechanism according to claim 1 or 2, characterized in that: the flexible transmission assembly is a synchronous belt or a chain.
4. The variable valve mechanism according to claim 1, characterized in that: the tensioning wheel is arranged on the inner side or the outer side of the flexible transmission assembly through an elastic adjusting device.
5. The variable valve mechanism according to claim 1, characterized in that: the phase adjusting wheel is positioned on the inner side or the outer side of the flexible transmission assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920418393.6U CN209800045U (en) | 2019-03-29 | 2019-03-29 | variable valve mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920418393.6U CN209800045U (en) | 2019-03-29 | 2019-03-29 | variable valve mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209800045U true CN209800045U (en) | 2019-12-17 |
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ID=68827115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920418393.6U Active CN209800045U (en) | 2019-03-29 | 2019-03-29 | variable valve mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209800045U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973169A (en) * | 2019-03-29 | 2019-07-05 | 英嘉动力科技无锡有限公司 | A kind of variable valve actuator for air |
-
2019
- 2019-03-29 CN CN201920418393.6U patent/CN209800045U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973169A (en) * | 2019-03-29 | 2019-07-05 | 英嘉动力科技无锡有限公司 | A kind of variable valve actuator for air |
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