CN109026461B - Internal combustion engine air port height adjusting device - Google Patents
Internal combustion engine air port height adjusting device Download PDFInfo
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- CN109026461B CN109026461B CN201810366078.3A CN201810366078A CN109026461B CN 109026461 B CN109026461 B CN 109026461B CN 201810366078 A CN201810366078 A CN 201810366078A CN 109026461 B CN109026461 B CN 109026461B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
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- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
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Abstract
The invention discloses a height adjusting device for an air port of an internal combustion engine, wherein the air port is arranged on the side wall of an air cylinder, and the height adjusting device comprises: a drive section; the output end of the driving part is connected with the input end of the speed reducing component, and the output end of the speed reducing component is a turbine; the height adjusting part comprises an adjusting rod and a sleeve, one end of the adjusting rod is connected with the center of the turbine, the other end of the adjusting rod is connected with an adjusting part, and the adjusting part is arranged at a position deviating from the central axis of the adjusting rod; the sleeve is sleeved on the outer side wall of the cylinder close to the air port and is in sliding connection with the outer side wall of the cylinder, a connecting piece is arranged on the outer side wall of the sleeve, and the adjusting part is in sliding connection with the connecting piece; the controller is electrically connected with the driving part; the position sensor is arranged at the shaft end of the turbine and used for acquiring the position of the sleeve and transmitting the position information to the controller; the controller utilizes the eccentric rotation of adjusting the pole to convert telescopic rectilinear motion into, and then realizes the regulation of gas port height.
Description
Technical Field
The invention relates to a height adjusting device for an air port of an internal combustion engine, in particular to a height adjusting device for the air port of the internal combustion engine adopting a two-stroke air port type ventilation mechanism, and belongs to the technical field of internal combustion engines.
Background
The height of the air port is the length of the air port along the central axis direction of the air cylinder, and the width of the air port is the length which is vertical to the central axis direction of the air cylinder and arranged along the circumferential direction of the air cylinder; the two-stroke air port type air exchange mechanism internal combustion engine controls the opening area of air inlet and outlet ports by the position of piston. Research shows that the height of the air port can influence the opening area of the air port, the opening and closing time of an air inlet and an air outlet, the effective compression ratio of an engine and the like, and the height ratio width of the air port has more obvious influence on the internal combustion engine, so that the invention is mainly developed aiming at the height adjusting mode of the air port.
The effective compression ratio of an internal combustion engine adopting an air port type air exchange system is the ratio of the volume enclosed by the top surface of an opposed piston and a cylinder when the opposed piston reaches the inner edge of an air inlet or an air outlet to the volume of a combustion chamber when the opposed piston reaches a top dead center, and is an important factor influencing the power and torque output of an engine. In the mature VCR scheme at home and abroad, the SVC engine of the Shenbao automobile adopts the mode of moving a crankshaft, changing the volume of a combustion chamber and further changing the compression ratio; ford corporation changes the shape and structure of the cylinder head, changes the volume of the combustion chamber by means of the slave piston or valve in the cylinder head, and then changes the compression ratio; the british institute of internal combustion engine and Daimler-Benz company both employ a variable piston height technique; the French MCE-5 variable compression ratio engine uses a roller guide piston technology; while the japanese nippon VCR engine uses a multi-link system, it can be seen that the typical variable compression ratio engine that is mature today is basically realized by changing the design of the piston and crank-link mechanism. However, the above technologies are relatively complex in structural design, generally require a great change to the engine structure, are difficult to process, are all designed in an integral manner, and have a great influence on the integrity of the system.
Disclosure of Invention
In view of the above, the present invention provides a new idea for optimizing the above problems by using the particularity of the port type ventilation mechanism of the two-stroke internal combustion engine and changing the height of the port to change the opening area of the port, the opening and closing time of the port, and the effective compression ratio.
The invention provides a device for adjusting the height of an air port of an internal combustion engine, which mainly aims at a two-stroke air port type air exchange mechanism, aiming at changing the height of the air port, wherein the air port of the device is arranged on the side wall of an air cylinder, and the device comprises:
a driving part, which may preferably be a motor;
the output end of the motor is connected with the input end of the speed reducing assembly, and the output end of the speed reducing assembly is a worm wheel;
the height adjusting part comprises an adjusting rod and a sleeve, one end of the adjusting rod is connected with the center of the worm wheel, the other end of the adjusting rod is connected with an adjusting part, and the adjusting part is arranged at a position deviating from the central axis of the adjusting rod; the sleeve is sleeved on the outer side wall of the cylinder close to the air port and is in sliding connection with the outer side wall of the cylinder, a connecting piece is arranged on the outer side wall of the sleeve, and the adjusting part is in sliding connection with the connecting piece;
a controller electrically connected to the driving part;
and the position sensor is arranged at the worm wheel shaft end and used for acquiring the position information of the sleeve and transmitting the position information to the controller.
The beneficial effect of adopting above-mentioned technical scheme is: the position sensor obtains the position information of the sleeve and transmits the position information to the controller, the controller sends an instruction to the motor, the motor drives the speed reduction assembly to drive the adjusting rod, the end part of the adjusting rod is provided with an adjusting part eccentrically arranged with the adjusting rod, the eccentric rotation of the adjusting part relative to the adjusting rod is converted into the linear motion of the sleeve, so that the adjustment of the height of the air port is realized, the motion amplitude of the adjusting rod is very small, compared with the prior art that the adjustment of the compression ratio is realized by changing the design of a piston and a crank connecting rod mechanism, the air port adjusting mechanism realizes the modularized design, and the adjustment and the structural modification of the whole engine system are smaller; the whole adjusting mechanism is simple in structure and clear in principle, corresponding control strategies can be formulated according to different engine types and operation conditions, and the adjusting mechanism is high in realizability and universality; through the adjustment of the opening area of the air inlet and outlet and the adjustment of the air distribution timing, the optimization of parameters such as air supply ratio, capture rate, scavenging efficiency and the like in the air exchange process is facilitated; the adjustment of the effective compression ratio of the internal combustion engine is beneficial to improving the output torque and power of the internal combustion engine and reducing the fuel consumption rate of the internal combustion engine to a certain extent.
The position sensor can be an angle sensor, the angle sensor is used for acquiring data of the rotation angle of the worm wheel shaft end to obtain the position of the sleeve and transmitting the position of the adjusting sleeve to the controller, and the controller controls the motor to operate.
Preferably, the controller is closed-loop control. The position sensor at the worm wheel shaft end feeds back a position signal to the controller, the controller sends an instruction to the motor, and the motor drives the speed reducing assembly and the speed reducing assembly to drive the connecting sleeve so as to achieve accurate adjustment of the height of the air port.
Preferably, the connecting piece is provided with a long strip-shaped groove, the adjusting part is positioned in the groove and is in relative sliding connection along the length direction of the long strip-shaped groove, namely the adjusting part slides to the other end of the groove along with the rotation of the adjusting rod.
When the adjusting rod is started to adjust the height of the air port, the adjusting part moves in an arc mode by taking the adjusting rod as the center and slides relative to the elongated groove, and the connecting piece fixedly installed on the outer side wall of the sleeve is driven to move in a translation mode along the direction of the central axis of the cylinder wall, so that the height of the air port is adjusted.
Preferably, the speed reduction assembly comprises a first-stage speed reduction mechanism and a second-stage speed reduction mechanism, the output end of the second-stage speed reduction mechanism is a worm wheel, the input end of the first-stage speed reduction mechanism is connected with the output shaft of the motor, and the first-stage speed reduction mechanism is in transmission connection with the second-stage speed reduction mechanism.
Preferably, the second-level speed reducing mechanism comprises a worm and a worm wheel, one end of the worm is in transmission connection with the first-level speed reducing mechanism, and the other end of the worm is in threaded section and is in transmission connection with the worm wheel.
Preferably, the primary speed reducing mechanism comprises a first gear and a second gear, the radius of the second gear is larger than that of the first gear and is meshed with the first gear, the first gear is connected with an output shaft of the motor, and the second gear is in coaxial transmission connection with one end of the worm. The tooth pitches of the first gear and the second gear can be approximately same, and the rotating speed of the gears is reduced by increasing the gear radius in the process of transmitting power from the first gear to the second gear.
The beneficial effect of adopting above-mentioned technical scheme is: the secondary speed reduction subsystem adopts the meshing transmission of a worm gear and a worm, the worm gear and the worm transmission are used for transmitting motion and power between staggered shafts, and in the system, an included angle between the two shafts is 90 degrees. The worm gear has large transmission ratio, compact structure, small volume and light weight; the worm teeth are continuously meshed with the worm gear teeth, and the worm gear teeth do not enter and exit the meshing process, so the working is stable and the impact noise is low; more importantly, the transmission has self-locking performance, the worm can only drive the worm wheel for transmission, and the worm wheel cannot drive the worm for transmission, so that the reverse rotation is prevented, and a good positioning effect is realized on the adjusting sleeve.
Preferably, a disc is coaxially arranged at the other end of the adjusting rod, the upper surface of the disc is fixedly connected with the other end of the adjusting rod, the lower surface of the disc is fixedly connected with the adjusting part, and the diameter of the disc is larger than that of the adjusting rod
Preferably, the sliding connection end is a cylindrical boss extending in a direction away from the disc with the lower surface of the disc as a reference surface. The eccentric rotation of the boss relative to the adjusting rod is converted into the linear motion of the sleeve, and then the height of the air port is adjusted.
The invention also provides an internal combustion engine, which comprises the internal combustion engine air port height adjusting device and an engine body, wherein the internal combustion engine air port height adjusting device is arranged in the engine body.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a top view of the structure of the present invention;
FIG. 3 is a schematic illustration of the speed reduction assembly of the present invention;
FIG. 4 is a schematic view of an adjusting lever structure of the present invention;
FIG. 5 is a schematic illustration of an internal combustion engine having a port height adjustment arrangement;
FIG. 6 is a schematic view of the process of adjusting the height of the air port.
The fuel injection device comprises a machine body 1, an air inlet piston 2, a fuel injector A3, a gas port adjusting mechanism 4, an exhaust piston 5, a crankshaft 6, an exhaust port 7, a fuel injector B8, a heat radiating fin 9, a gas inlet 10, an adjusting rod 11, a worm wheel 12, a gear A13, a motor 14, a machine shell 15, a fixed rod 16, a gear B17, a worm 18, a cylinder outer side wall 19, an adjusting sleeve 20, a gear A21, a gear A 'shaft 22, a gear B' shaft 22, a boss 23, a connecting piece 24 and a groove 25.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, an embodiment of the present invention discloses an internal combustion engine port height adjusting device, which is used for a two-stroke internal combustion engine adopting a port type ventilation structure, and comprises:
a drive section, which may be a motor 14;
the output shaft of the motor 14 is connected with the input end of the speed reducing component, and the output end of the speed reducing component is a worm wheel 12;
the height adjusting part 4 comprises an adjusting rod 11 and a sleeve 20, one end of the adjusting rod 11 is connected with the center of the worm wheel 12, the other end of the adjusting rod is connected with an adjusting part, and the adjusting part is arranged at a position deviating from the central axis of the adjusting rod 11; the sleeve 20 is sleeved on the outer side wall 19 of the cylinder close to the air port and is in sliding connection with the outer side wall 19 of the cylinder, a connecting piece 24 is arranged on the outer side wall of the sleeve 20, and the adjusting part is in sliding connection with the connecting piece 24;
the two sleeves 20 are respectively sleeved on the outer side walls of the two cylinders which are arranged in parallel, are respectively correspondingly provided with the air inlet 10 and the air outlet 7 and are in sliding connection with the outer side wall 19 of each cylinder, the two sleeves 20 are connected through a connecting piece 24, the connecting piece can be a connecting plate, and the adjusting part is in sliding connection with the connecting piece;
the controller is electrically connected with the driving part;
the position sensor is arranged at the shaft end of the worm wheel, can be an angle sensor, and acquires the data of the rotation angle of the shaft end of the worm wheel through the angle sensor and transmits the data to the controller; the controller controls the driving part to operate, and then drives the connecting sleeve of the speed reduction assembly to move along the height direction of the air port.
In the embodiment of the present invention, a disc may be coaxially disposed at the other end of the adjusting rod 11, an upper surface of the disc is fixedly connected to the other end of the adjusting rod 11, a lower surface of the disc is fixedly connected to the adjusting portion, and a diameter of the disc is greater than a diameter of the adjusting rod 11;
in an embodiment of the present invention, the regulating portion may be a cylindrical boss 23; the axle line B-B 'shaft 22 of the boss deviates from the axle line A-A' shaft 21 of the adjusting rod; the connecting piece 24 is provided with a groove 25, and the lug boss 23 is connected with the groove 25 in a sliding way.
In embodiments of the present invention, the controller may employ closed loop control. The position sensor at sleeve 20 feeds back a position signal to the controller, which commands motor 14, and motor 14 drives the height adjustment system for further adjustment to achieve precise adjustment of the port height.
As shown in fig. 2, the air port height adjusting means 4 is compactly arranged in the casing 15 with little modification to the original structure and has a negligible influence on the machine body 1.
The speed reducing assembly comprises a first-stage speed reducing mechanism and a second-stage speed reducing mechanism, the output end of the second-stage speed reducing mechanism is a worm wheel 12, the input end of the first-stage speed reducing mechanism is connected with the output shaft of a motor 14, and the first-stage speed reducing mechanism is in transmission connection with the second-stage speed reducing mechanism.
The secondary speed reducing mechanism comprises a worm 18 and the worm wheel 12, one end of the worm 18 is in transmission connection with the primary speed reducing mechanism, and the other end of the worm 18 is a threaded section and is in transmission connection with the worm wheel 12;
the first-stage speed reducing mechanism comprises a first gear 13 and a second gear 17, the radius of the second gear 17 is larger than that of the first gear 13 and is in meshed connection with the first gear 13, the first gear 13 is connected with an output shaft of the motor 14, and the second gear 17 is in coaxial transmission connection with one end of the worm 18. The first speed reduction function is realized by changing the transmission ratio through a primary speed reduction mechanism formed by the second gear 17 and the first gear 13;
the secondary reduction system uses meshing transmission of the worm wheel 12 and the worm 18, the worm wheel 12 and the worm 18 are used for transmitting motion and power between staggered shafts, and in the system, an included angle between the two shafts is 90 degrees. The worm wheel 12 and the worm 18 have large transmission ratio and compact structure, and have the advantages of small volume and light weight; the meshing of the worm 18 and the worm wheel 12 is continuous, and the meshing process of the worm wheel 12 does not occur, so that the working is stable and the impact noise is low; more importantly, the transmission has self-locking property, the worm 18 only can drive the worm wheel 12 to transmit, and the worm wheel 12 cannot drive the worm 18 to transmit, so that the reverse rotation is prevented, and the adjusting sleeve 20 is well positioned.
As shown in fig. 5, the present invention further provides an internal combustion engine, which includes an internal combustion engine air port height adjusting device and a machine body 1, wherein an air inlet piston 2, an air inlet 10, an air outlet 7, an air outlet piston 5 and a crankshaft 6 are sequentially arranged in the machine body 1 from left to right, an oil injector a3 and an oil injector B8 with cooling fins 9 are respectively and correspondingly arranged on the upper side and the lower side between the air inlet 10 and the air outlet 7, and the air port height adjusting device 4 is sleeved outside the air inlet 10 and the air outlet 7 and is slidably connected with the cylinder outer side wall 19.
The specific working process is as follows:
according to the specific working condition requirement, the controller sends an instruction to enable the motor 14 to operate, the first gear 13 is driven to rotate so as to drive the second gear 17 meshed with the first gear, meanwhile, the worm 18 coaxial with the second gear 17 rotates, the worm wheel 12 rotates through torque transmission of the worm 18, the adjusting rod 11 is driven to rotate, the boss 23 rotates around the A-A' shaft 21, the sleeve 20 is driven to move along the central axis of the outer side wall 19 of the cylinder, and the rotating track and the moving track of the sleeve 20 are shown as dotted lines in FIG. 6; position signals are fed back to the controller through the position sensor arranged on the end of the worm wheel shaft, the controller sends instructions to the motor 14, and the motor 14 drives the height adjusting system to further adjust, so that the height of the air port is accurately adjusted.
Aiming at different working conditions, the regulation rule of the height of the air inlet and outlet 7 is approximately as follows:
when the engine speed increases, the height of the exhaust port 7 needs to be increased to a certain extent, the exhaust volume is increased under the condition that the exhaust duration is shortened, the in-cylinder pressure is reduced, and the intake pressure difference is increased; for the intake port 10, in the case where the intake duration is short, the height of the intake port 10 needs to be increased to increase the intake air amount, but at the same time, the compression ratio is also decreased, so that a specific adjustment needs to be made after a tradeoff. When the load of the engine is increased, the oil supply amount is increased, the cylinder pressure is increased, and to a certain extent, the height of the exhaust port 7 needs to be increased to increase the exhaust amount, reduce the pressure in the cylinder and increase the air inlet pressure difference; while increasing the height of the intake port 10 to increase the amount of intake air to meet the air-fuel ratio demand required for operation.
The engine system adopts tandem type composite supercharging, when the height of the exhaust port 7 is increased, the exhaust volume per unit time is increased, the energy obtained by the worm gear 12 supercharger is increased, the energy utilization rate of waste gas is increased, and the efficiency of the whole engine system is improved; when the height of the air inlet 10 is increased, the air inlet amount per unit time is increased, and under the same working condition, the required power of the mechanical supercharging system is reduced, so that the effective power output by the crankshaft 6 is increased.
The invention provides a gas port height adjusting device of an internal combustion engine, which utilizes the eccentric rotation of an adjusting rod to be converted into the linear motion of a sleeve so as to further realize the adjustment of the height of a gas port, the motion amplitude of the adjusting rod is very small, compared with the prior art that the adjustment of a compression ratio is realized by changing the design of a piston and a crank connecting rod mechanism, the gas port adjusting mechanism realizes the modularized design, and the adjustment and the structural modification of the whole engine system are smaller; the whole adjusting mechanism is simple in structure and clear in principle, corresponding control strategies can be formulated according to different engine types and operation conditions, and the adjusting mechanism is high in realizability and universality; through the adjustment of the opening area of the air inlet and outlet and the adjustment of the air distribution timing, the optimization of parameters such as air supply ratio, capture rate, scavenging efficiency and the like in the air exchange process is facilitated; the adjustment of the effective compression ratio of the internal combustion engine is beneficial to improving the output torque and power of the internal combustion engine and reducing the fuel consumption rate of the internal combustion engine to a certain extent.
The secondary speed reduction subsystem adopts the meshing transmission of a worm gear and a worm, the worm gear and the worm transmission are used for transmitting motion and power between staggered shafts, and in the system, an included angle between the two shafts is 90 degrees. The worm gear has large transmission ratio, compact structure, small volume and light weight; the worm teeth are continuously meshed with the worm gear teeth, and the worm gear teeth do not enter and exit the meshing process, so the working is stable and the impact noise is low; more importantly, the transmission has self-locking performance, the worm can only drive the worm wheel for transmission, and the worm wheel cannot drive the worm for transmission, so that the reverse rotation is prevented, and a good positioning effect is realized on the adjusting sleeve.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides an internal-combustion engine gas port height adjusting device, the gas port is seted up on the lateral wall of cylinder, its characterized in that includes:
a drive section;
the output end of the driving part is connected with the input end of the speed reducing component, and the output end of the speed reducing component is a worm wheel (12);
the height adjusting part (4) comprises an adjusting rod (11) and a sleeve (20), one end of the adjusting rod (11) is connected with the center of the worm wheel (12), the other end of the adjusting rod is connected with an adjusting part, and the adjusting part is arranged at a position deviating from the central axis of the adjusting rod (11); the sleeve (20) is sleeved on the outer side wall (19) of the cylinder close to the air port and is in sliding connection with the outer side wall (19) of the cylinder, a connecting piece (24) is arranged on the outer side wall of the sleeve (20), and the adjusting portion is in sliding connection with the connecting piece (24); the connecting piece (24) is provided with a strip-shaped groove (25), and the adjusting part is positioned in the groove (25) and is in relative sliding connection along the length direction of the groove (25);
a controller electrically connected to the driving part;
and the position sensor is arranged at the worm wheel shaft end and used for acquiring the position information of the sleeve and transmitting the position information to the controller.
2. An internal combustion engine gas port height adjusting device as claimed in claim 1, wherein the driving part is an electric motor (14), and an output shaft of the electric motor (14) is connected with an input end of the speed reducing assembly.
3. The internal combustion engine gas port height adjusting device of claim 2, wherein the speed reduction assembly comprises a primary speed reduction mechanism and a secondary speed reduction mechanism, the output end of the secondary speed reduction mechanism is a worm wheel (12), the input end of the primary speed reduction mechanism is connected with the output shaft of the motor (14), and the primary speed reduction mechanism and the secondary speed reduction mechanism are in transmission connection.
4. The internal combustion engine gas port height adjusting device of claim 3, wherein the secondary speed reducing mechanism comprises a worm (18) and the worm wheel (12), one end of the worm (18) is in transmission connection with the primary speed reducing mechanism, and the other end of the worm (18) is in threaded section and is in transmission connection with the worm wheel (12).
5. An internal combustion engine gas port height adjusting device according to claim 4, characterized in that the primary speed reducing mechanism comprises a first gear (13) and a second gear (17), the second gear (17) has a larger radius than the first gear (13) and is in meshed connection with the first gear, the first gear (13) is connected with an output shaft of the motor (14), and the second gear (17) is in coaxial transmission connection with one end of the worm (18).
6. An internal combustion engine port height adjusting apparatus as set forth in claim 5, wherein one end of said worm (18) is keyed to said second gear (17).
7. An internal combustion engine gas port height adjusting device as claimed in any one of claims 1 to 6, characterized in that the other end of the adjusting rod (11) is coaxially provided with a disc, the upper surface of the disc is fixedly connected with the other end of the adjusting rod (11), the lower surface of the disc is fixedly connected with the adjusting part, and the diameter of the disc is larger than that of the adjusting rod (11).
8. An internal combustion engine port height adjusting apparatus as set forth in claim 7, wherein said adjusting portion is a cylindrical boss (23) extending away from said disc with reference to a lower surface of said disc.
9. An internal combustion engine, characterized by comprising the internal combustion engine port height adjusting apparatus according to any one of claims 1 to 8 and a machine body (1), the internal combustion engine port height adjusting apparatus being installed in the machine body (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810366078.3A CN109026461B (en) | 2018-04-23 | 2018-04-23 | Internal combustion engine air port height adjusting device |
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|---|---|---|---|
| CN201810366078.3A CN109026461B (en) | 2018-04-23 | 2018-04-23 | Internal combustion engine air port height adjusting device |
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| CN109026461A CN109026461A (en) | 2018-12-18 |
| CN109026461B true CN109026461B (en) | 2020-10-27 |
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| CN110566787A (en) * | 2019-09-27 | 2019-12-13 | 哈工大机器人（合肥）国际创新研究院 | Mechanical lifting upright post |
| CN115506871A (en) * | 2021-06-23 | 2022-12-23 | 北汽福田汽车股份有限公司 | Oil pump, lubricating system and vehicle |
| CN114856849B (en) * | 2022-06-02 | 2023-09-29 | 北京理工大学 | Combined cylinder sleeve of opposed piston two-stroke engine |
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| GB2490397A (en) * | 2011-04-25 | 2012-10-31 | Ecomotors Internat Inc | Cylinder having a first plurality of intake ports and a second plurality of intake ports at respective first and second distances from a crankshaft |
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| FR2538031A2 (en) * | 1982-12-16 | 1984-06-22 | Eymas Noel | Two-stroke engine with complementary pistons and separate chambers in the area of top dead centre |
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