CN109083762B - Engine and piston device thereof - Google Patents
Engine and piston device thereof Download PDFInfo
- Publication number
- CN109083762B CN109083762B CN201810989730.7A CN201810989730A CN109083762B CN 109083762 B CN109083762 B CN 109083762B CN 201810989730 A CN201810989730 A CN 201810989730A CN 109083762 B CN109083762 B CN 109083762B
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- piston
- oil
- engine
- cavity
- oil outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length
Abstract
The invention discloses an engine and a piston device thereof, comprising a piston upper part and a piston lower part, wherein the piston upper part and the piston lower part are in sliding fit along the motion direction of the piston, the piston upper part faces the direction of a cylinder cover, and the piston lower part is used for being connected with a connecting rod crank component; and a displacement output assembly is arranged between the upper part and the lower part of the piston and is used for adjusting the relative distance between the upper part and the lower part of the piston. The piston device is of a split structure, two parts of a main body of the piston device can relatively slide along the motion direction of the piston, the sliding is controlled through a displacement output assembly, the distance between the upper part of the piston and the lower part of the piston is adjusted, and the length of the piston in the stroke direction of the piston is changed.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine piston device and an engine.
Background
After the engine is designed and manufactured, many parameters are fixed, the compression ratio is one of the parameters, and the parameters are only a compromise after the best state under various working conditions is synthesized, so that the engine can not fully exert the performance of the engine.
The compression ratio is one of important parameters for measuring the performance of the engine, and refers to the ratio of the total volume of the cylinder to the volume of a combustion chamber, and represents the compression degree of gas in the cylinder when the piston moves from the bottom dead center to the top dead center. The performance of the engine generally becomes stronger with the increase of the compression ratio, but when the engine is under the working condition of large load and high rotating speed, the too high compression ratio can cause the engine to generate knocking, and the service life of the engine is reduced.
Therefore, the variable compression ratio technology is adopted, the reasonable compression ratio is adopted in real time according to the working condition of the engine, the performance of the engine is fully exerted, and when the engine is in low load and low rotating speed, the high compression ratio is adopted, so that the heat efficiency and the fuel economy of the engine are improved; when the engine is in a working condition of large load and high rotating speed, the low compression ratio is adopted, so that the engine is prevented from knocking, a large thermal load and a large mechanical load are brought in a short time, and the service life of the engine is prolonged.
The existing design of the engine with variable compression ratio is mainly realized by moving a cylinder cover above a combustion chamber to generate displacement, or by changing the structure of a cylinder body where the combustion chamber is located and changing a crankshaft connecting rod mechanism. However, these designs have some problems, mainly manifested in: the engine is difficult to change greatly; the overall dimension of the engine is enlarged and the mass is increased by transformation; the mass of the movable part is increased and the energy loss is increased; the control part has large volume and mass, and cannot respond to the engine in time to adjust the compression ratio, so that the effect is reduced. The problems restrict the application of the advantageous technology of variable compression ratio in mass production of engine products.
In summary, how to effectively solve the technical problems that the existing variable compression ratio engine is complex in design structure, high in cost, difficult to adapt to the normal technical requirements of the engine, difficult to put into wide use of products and the like is a problem which needs to be solved urgently by a person skilled in the art at present.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide an engine piston device, which can effectively solve the technical problems that the existing engine with variable compression ratio has a complicated structure, high cost, and is difficult to adapt to the normal technical requirements of the engine, so that the product is difficult to be widely used, and a second object of the present invention is to provide an engine including the above engine piston device.
In order to achieve the first object, the invention provides the following technical scheme:
an engine piston device comprises a piston upper part and a piston lower part, wherein the piston upper part and the piston lower part are in sliding fit with each other along the motion direction of a piston and are in sealing fit with the inner wall of a cylinder body, the piston upper part faces the direction of a cylinder cover, and the piston lower part is used for being connected with a connecting rod crank assembly; and a displacement output assembly is arranged between the upper part and the lower part of the piston and is used for adjusting the relative distance between the upper part and the lower part of the piston.
Preferably, in the engine piston device, the displacement output assembly includes an oil chamber disposed between the upper portion and the lower portion of the piston, and an oil passage and an output control mechanism communicated with the oil chamber, and configured to control hydraulic oil to enter and exit the oil chamber to drive the upper portion and the lower portion of the piston to approach or move away from each other.
Preferably, in the engine piston device, the piston lower portion includes a piston bottom cavity and a piston lower cover body that are connected by a thread, and the output control mechanism is disposed in a cavity between the piston bottom cavity and the piston lower cover body.
Preferably, in the engine piston device, the oil chamber is respectively communicated with an oil inlet path and an oil outlet path, and the oil inlet path and the oil outlet path both penetrate through the piston bottom cavity and the piston lower cover body and are communicated with the control oil path in the piston bottom cavity.
Preferably, in the engine piston device, the oil inlet path is communicated with the oil chamber through an oil inlet hole formed in the upper surface of the piston lower cover body, and an oil inlet check valve is arranged in the oil inlet path; the oil outlet path is communicated with the oil cavity through an oil outlet hole arranged at a preset position of the piston lower cover body, and an oil outlet one-way valve is arranged in the oil outlet path; the output control mechanism comprises a cam used for blocking or exposing the oil outlet through rotation, and the cam is connected with a rotation output mechanism.
Preferably, in the engine piston device, the rotary output mechanism is specifically a motor, the motor is installed and positioned with the piston bottom cavity through a base plate, a stator of the motor is installed in a cylindrical cavity fixed on the base plate, and the stator of the motor is circumferentially installed and positioned with the cam.
Preferably, in the engine piston device, the cam includes a threaded sleeve and an upper cover plate which are integrally connected, the threaded sleeve and the stator of the motor are coaxially installed and positioned, the upper cover plate is cylindrical, two half-hole structures penetrating through the upper cover plate in the thickness direction are arranged at intervals of 180 degrees on the edge of the upper cover plate, and the half-hole structures are used for penetrating through the oil cavity and the oil outlet.
Preferably, in the engine piston device, a tension spring is connected between the piston upper portion and the piston lower cover, and is configured to draw the distance between the piston upper portion and the piston lower portion to a predetermined value when the oil chamber is drained with oil.
Preferably, in the engine piston device, an annular guide protrusion is disposed on an outer edge of a top surface of the piston lower cover, an annular guide groove is disposed at a corresponding position on an upper portion of the piston, and the annular guide protrusion is in concave-convex fit with the annular guide groove.
The invention provides an engine piston device, which comprises a piston upper part and a piston lower part, wherein the piston upper part and the piston lower part are in mutual sliding fit along the motion direction of a piston and are in sealing fit with the inner wall of a cylinder body; and a displacement output assembly is arranged between the upper part and the lower part of the piston and is used for adjusting the relative distance between the upper part and the lower part of the piston. The piston device is of a split structure, two parts of a main body of the piston device can relatively slide along the movement direction of the piston, the sliding is controlled through the displacement output assembly, the distance between the upper part of the piston and the lower part of the piston is adjusted, and the length of the piston in the stroke direction of the piston is changed, so that under the condition that the structures of a crank connecting rod mechanism and a cylinder body are not changed, the actual running distance of the piston moving from a lower dead point to an upper dead point is changed equivalently, the purpose of changing the compression ratio is achieved, the displacement output of the displacement output assembly is adjusted adaptively according to the actual working condition of the operation of an engine, the thermal efficiency of the engine can be improved by ensuring the compression ratio, and the effect of reducing the mechanical load is achieved. This design principle utilizes the theory of operation of piston self, and its stroke characteristic of make full use of avoids carrying out excessive complication to cylinder body and crank connecting rod structure, avoids engine quality too big or manufacturing cost too high, provides an effective scheme that will just compress the technical input volume of ratio.
In order to achieve the second object, the invention also provides an engine comprising any one of the engine piston devices described above. Due to the technical effects of the piston device of the engine, the engine with the piston device of the engine also has corresponding technical effects.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic side sectional view of a piston assembly of an engine according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a piston lower cover of an engine piston assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a top view of a cam of a piston assembly of an engine according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a piston bottom cavity of an engine piston device according to an embodiment of the present invention.
The drawings are numbered as follows:
the piston comprises a piston upper part 1, an annular guide groove 2, an annular guide bulge 3, an oil inlet check valve 4, an oil inlet pipe 5, a clamping ring 6, a base plate 7, an oil inlet path 8, a piston bottom cavity 9, a stator 10, a boss 11, an oil outlet path 13, an oil outlet pipe 14, an oil outlet check valve 15, a piston lower cover body 16, an oil cavity 17, a tension spring 18, an oil outlet hole 19, a rotor 20, a cam 21, an oil inlet hole 22, a motor 23, a cylindrical sinking groove 24, a half-hole structure 25 and an upper cover plate 26.
Detailed Description
The embodiment of the invention discloses an engine piston device, which aims to effectively solve the technical problems that the existing engine with variable compression ratio has a complex design structure and high cost, is difficult to adapt to the normal technical requirements of the engine, and is difficult to put into wide use.
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.
Referring to fig. 1-4, fig. 1 is a schematic side sectional view of a piston device of an engine according to an embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of a piston lower cover of an engine piston assembly according to an embodiment of the present invention; FIG. 3 is a schematic diagram illustrating a top view of a cam of a piston assembly of an engine according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of a piston bottom cavity of an engine piston device according to an embodiment of the present invention.
The piston device of the engine provided by the embodiment of the invention comprises an upper piston part 1 and a lower piston part, wherein the upper piston part 1 and the lower piston part are in sliding fit with each other along the movement direction of the piston and are in sealing fit with the inner wall of a cylinder body, namely, the piston can have a certain expansion amount through relative sliding between the upper piston part 1 and the lower piston part, so that the piston has a structural foundation capable of changing the actual length, the upper piston part 1 faces the direction of a cylinder cover, and the lower piston part is used for being connected with a connecting rod crank assembly, wherein the upper piston part 1 or the lower piston part is in a relatively broad concept, and more other detachable structures can.
The displacement output assembly is arranged between the upper piston part 1 and the lower piston part and used for adjusting the relative distance between the upper piston part 1 and the lower piston part, and the displacement output assembly can be in various forms such as a gear, a lever and other mechanical transmission types, or a hydraulic driving type and a pneumatic driving type and the like.
The piston device is of a split structure, two parts of a main body of the piston device can relatively slide along the movement direction of the piston, the sliding is controlled through a displacement output assembly, the distance between the upper part 1 of the piston and the lower part of the piston is adjusted, and therefore the length of the piston in the stroke direction is changed, so that under the condition that the structures of a crank connecting rod mechanism and a cylinder body are unchanged, the actual running distance of the piston moving from a lower dead point to an upper dead point is changed equivalently, and the purpose of changing the compression ratio is achieved.
The displacement output of the displacement output component is adaptively adjusted according to the actual working condition of the engine operation, so that the heat efficiency of the engine can be improved by ensuring the compression ratio, and the mechanical load is reduced. This design principle utilizes the theory of operation of piston self, and its stroke characteristic of make full use of avoids carrying out excessive complication to cylinder body and crank connecting rod structure, avoids engine quality too big or manufacturing cost too high, provides an effective scheme that will just compress the technical input volume of ratio.
The displacement output assembly comprises an oil cavity 17 arranged between the upper part 1 of the piston and the lower part of the piston, and an oil path and an output control mechanism communicated with the oil cavity 17, the lower part of the piston comprises a piston bottom cavity 9 and a piston lower cover body 16 which are in threaded connection, the output control mechanism is arranged in a cavity between the piston bottom cavity 9 and the piston lower cover body 16, the oil cavity 17 is respectively communicated with an oil inlet path 8 and an oil outlet path 13, and the oil inlet path 8 and the oil outlet path 13 both penetrate through the piston bottom cavity 9 and the piston lower cover body 16 and are communicated with the control oil path in the piston bottom cavity 9.
The oil chamber 17 is a cylindrical cavity structure, a cylindrical groove facing the piston upper part 1 is arranged on the piston lower cover body 16, and a cylindrical convex structure is arranged at a corresponding position of the piston upper part 1 and can form sealing fit with the cylindrical groove, so that the oil chamber 17 is formed in the space. A step surface structure is arranged between the piston bottom cavity 9 and the piston lower cover body 16 for matching, threads are arranged on the matched circumferential step surface, and the piston bottom cavity 9 and the piston lower cover body are connected and fixed through the threads.
The structure of the oil chamber 17 in this embodiment can be analogized to a cylinder body in a hydraulic cylinder assembly, and has the characteristics of containing hydraulic oil and being variable in volume, and the oil chamber is communicated with an oil inlet path 8 and an oil outlet path 13, so as to realize the input or discharge of hydraulic oil into or out of the cylinder; the structure of further refining the lower part of the piston comprises a piston bottom cavity 9 and a piston lower cover body 16 which are in threaded connection with each other, wherein the piston bottom cavity 9 in the piston bottom cavity is one end facing a crank connecting rod, the upper structure of the lower body of the piston is separated, so that the problem that the upper structure of the same component is too complex to cause high production and processing cost is solved, a cavity is arranged between the piston bottom cavity and the piston lower cover body, an output control mechanism can be fully accommodated, the condition of two oil ways is controlled through the design, the oil amount in the oil cavity 17 is changed, and the size of.
The oil inlet path 8 is communicated with the oil cavity 17 through an oil inlet hole 22 arranged on the upper surface of the piston lower cover body 16, and an oil inlet one-way valve 4 is arranged in the oil inlet path 8; the oil outlet path 13 is communicated with the oil cavity 17 through an oil outlet hole 19 arranged at a preset position of the piston lower cover body 16, and an oil outlet one-way valve 15 is arranged in the oil outlet path 13;
in order to provide the oil outlet passage 13 and the oil inlet passage 8 with the structure of the check valve and to process the hollow oil passage inside the member at a high cost, it is preferable to use the structure of the oil inlet pipe 5 and the oil outlet pipe 14 when the oil passage passes through the space between the piston bottom cavity 9 and the piston lower cover 16, to communicate the piston bottom cavity 9 with the oil passage in the piston lower cover 16 by the structure of the pipes, and to provide the corresponding check valve on the oil pipe.
The output control mechanism includes a cam 21 for blocking or exposing the oil outlet 19 by a rotational action, and the cam 21 is connected with a rotational output mechanism. The rotary output mechanism is specifically a motor 23, the motor 23 is installed and positioned with the piston bottom cavity 9 through the base plate 7, a stator 10 of the motor 23 is installed in a cylindrical cavity fixed on the base plate 7, and the stator 10 of the motor 23 and the cam 21 are circumferentially positioned and installed.
Wherein the motor 23 preferably adopts step motor 23, so that carry out comparatively accurate rotatory output control and guarantee to advance the accuracy of going out oil through cam 21 structural control, motor 23 passes through the structure of bed plate 7 and piston bottom cavity 9 installation is fixed, the structure that has the step face in the piston bottom cavity 9, be used for supporting bed plate 7, the ascending one side of step face is provided with the boss 11 that is used for the location, be provided with corresponding recess on the bed plate 7, firm in order to ensure the installation of bed plate 7, ensure that its circumference obtains good location, set up the structure of snap ring 6 in the other one side of bed plate 7, the top position of bed plate 7 sets up annular groove on the inner peripheral face of step face, be used for packing into snap ring 6, in order to realize the location to bed plate 7.
Adapt to the design of above-mentioned oil outlet 19 and inlet port 22, set up the cam 21 that can block the oilhole under the piston on lid 16, through motor 23 drive cam 21's rotation to utilize cam 21 to pound self structure and shelter from blocking or letting out the oilhole, thereby reach the oil mass control to business turn over oil pocket 17, it is specific:
when the engine is in a working condition of medium and low load and low rotating speed, a high compression ratio is needed, an engine ECU control system sends an instruction, the motor 23 is driven finally through the distribution and amplification of a matched driver, the motor 23 is driven to rotate, a rotor 20 of the motor 23 drives a cam 21 to rotate, the cam 21 seals an oil outlet 19, oil passes through an oil inlet path 8 and an oil inlet check valve 4 in the lower part of the piston body through an external oil supply system and finally enters an oil cavity 17 from an oil inlet 22, the oil cavity 17 is changed into a high-pressure state due to the fact that the oil enters and the oil outlet 19 is sealed, high pressure generates relatively upward pressure on the upper part of the piston body, the upper part 1 of the piston is pushed to move upward relative to a lower piston cover body 16, the whole piston is lengthened.
When the engine is in a working condition of large load and high rotating speed, a low compression ratio is needed, at the moment, the motor 23 controls the motor 23 to rotate according to an instruction sent by an engine ECU (electronic control Unit), the cam 21 leaves the oil outlet 19 through rotating, the oil outlet 19 is opened, the oil inlet channel 8 stops supplying oil into the oil cavity 17 under the ECU control instruction, oil in the oil cavity 17 flows out of an external oil outlet system through the oil outlet channel 13, therefore, the pressure of the oil cavity 17 is reduced, and under the action of other external forces, such as a reset spring and the like, the upper part 1 of the piston relatively moves downwards to the lower cover body 16 of the piston, so that the whole piston is shortened, and at the moment, the compression ratio of.
The cam 21 comprises a threaded sleeve and an upper cover plate 26 which are integrally connected, the threaded sleeve and the stator 10 of the motor 23 are coaxially installed and positioned, the upper cover plate 26 is cylindrical, two half-hole structures 25 penetrating through the upper cover plate in the thickness direction are arranged at intervals of 180 degrees at the edge of the upper cover plate 26, and the half-hole structures 25 are used for penetrating through the oil cavity 17 and the oil outlet 19. In order to adapt the structure of the upper cover plate 26 and ensure the sealing performance of the upper cover plate to the blocking of the oil outlet 19, an inner cylindrical sinking groove 24 matched with the shape of the upper cover plate 26 is preferably arranged on the upper surface of the piston lower cover body 16, the opening of the oil outlet 19 is arranged on the bottom surface of the sinking groove, and the upper cover plate 26 is sunk into the sinking groove to ensure the better effect of blocking the oil outlet 19.
The technical scheme provided by the embodiment further optimizes the design of the cam 21, and in order to facilitate the installation and positioning of the cam and the rotor 20 of the motor 23, a threaded sleeve with internal threads is adopted to be matched and positioned with the external threads at one end of the rotor 20, wherein the screwing direction of the motor 23 is preferably consistent with the screwing direction of the threads;
the other end of the threaded sleeve is provided with an upper cover plate 26, the outer edge of the upper cover plate 26 is provided with a half-hole structure 25, so that the oil outlet 19 can be communicated with the oil chamber 17 through the structure, and the purpose of arranging two half-hole structures 25 at an interval of 180 degrees is as follows:
the opening and closing state of the oil cavity 17 can be changed by rotating the rotor 20 of the motor 23 by 90 degrees, stepless change of the compression ratio within a certain range can be realized, the motor 23 is directly controlled by an engine ECU, the opening and closing state time of the oil cavity 17 can be accurately controlled, the switching is fast carried out according to different working conditions of the engine, the compression ratio adjusting speed of the engine is effectively improved, and the comprehensive performance of the engine is improved.
An extension spring 18 is connected between the piston upper part 1 and the piston lower cover 16, and is used for positioning the distance between the piston upper part 1 and the piston lower part under the condition that oil is discharged from the oil chamber 17. The outer edge of the top surface of the piston lower cover body 16 is provided with an annular guide bulge 3, the corresponding position of the piston upper part 1 is provided with an annular guide groove 2, and the annular guide bulge 3 is in concave-convex fit with the annular guide groove 2.
The design mainly provides a means for the oil chamber 17 to reset immediately when the internal pressure is reduced, and meanwhile, the upper part 1 of the piston and the lower part of the piston can be effectively connected at the other end to prevent the two parts from being separated directly, so that a structure of an extension spring 18 is arranged, the direction of the extension spring is the stroke direction of the piston, the extension spring is connected between the upper part 1 of the piston and a lower cover body 16 of the piston, and two ends of the extension spring are respectively connected and fixed with corresponding positions of the piston through a clamp spring/clamp ring structure;
on the basis, a guiding structural part is arranged, namely, an annular bulge is arranged on the piston lower cover body 16, a guide groove is arranged at a corresponding position near the outer edge of the upper part 1 of the piston, the piston body is well matched through concave-convex matching of the piston body and the annular bulge, and meanwhile, the structure such as the extension spring 18 can be sealed in the whole structure of the piston through the structure, so that impurities are prevented from entering the piston.
Based on the engine piston device provided in the above embodiment, the invention further provides an engine, which comprises the engine piston device in any one of the above embodiments. Because the engine adopts the engine piston device in the above embodiment, please refer to the above embodiment for the beneficial effect of the engine.
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 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 (6)
1. The piston device of the engine is characterized by comprising a piston upper part and a piston lower part, wherein the piston upper part and the piston lower part are in mutual sliding fit along the motion direction of the piston and are in sealing fit with the inner wall of a cylinder body; a displacement output assembly is arranged between the upper part and the lower part of the piston and is used for adjusting the relative distance between the upper part and the lower part of the piston;
the displacement output assembly comprises an oil cavity arranged between the upper part and the lower part of the piston, an oil way communicated with the oil cavity and an output control mechanism, and is used for controlling hydraulic oil to enter and exit the oil cavity so as to drive the upper part and the lower part of the piston to approach or move away; the lower part of the piston comprises a piston bottom cavity and a piston lower cover body which are connected through threads, and the output control mechanism is arranged in a cavity between the piston bottom cavity and the piston lower cover body; the oil cavity is respectively communicated with an oil inlet path and an oil outlet path, and the oil inlet path and the oil outlet path penetrate through the piston bottom cavity and the piston lower cover body and are communicated with a control oil path in the piston bottom cavity; the oil inlet path is communicated with the oil cavity through an oil inlet hole formed in the upper surface of the lower piston cover body, and an oil inlet one-way valve is arranged in the oil inlet path; the oil outlet path is communicated with the oil cavity through an oil outlet hole arranged at a preset position of the piston lower cover body, and an oil outlet one-way valve is arranged in the oil outlet path; the output control mechanism comprises a cam used for blocking or exposing the oil outlet through rotation, and the cam is connected with a rotation output mechanism.
2. The engine piston device of claim 1, wherein the rotary output mechanism is embodied as an electric motor, the electric motor is mounted and positioned with the piston bottom cavity through a base plate, a stator of the electric motor is mounted in a cylindrical cavity fixed on the base plate, and the stator of the electric motor is circumferentially positioned and mounted with the cam.
3. The piston device of claim 2, wherein the cam includes a threaded sleeve and an upper cover plate integrally connected to each other, the threaded sleeve is coaxially mounted and positioned with the stator of the motor, the upper cover plate is cylindrical, and two half-hole structures penetrating the upper cover plate in the thickness direction are provided at 180 ° intervals at the edge of the upper cover plate, and the half-hole structures are used for penetrating the oil chamber and the oil outlet.
4. The engine piston device according to claim 3, wherein a tension spring is connected between said piston upper portion and said piston lower cover for positioning said piston upper portion and said piston lower portion in a state where said oil chamber is drained of oil.
5. The piston device for the engine as claimed in claim 4, wherein the outer edge of the top surface of the piston lower cover body is provided with an annular guide protrusion, the corresponding position of the upper part of the piston is provided with an annular guide groove, and the annular guide protrusion is in concave-convex fit with the annular guide groove.
6. An engine comprising an engine piston arrangement according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989730.7A CN109083762B (en) | 2018-08-28 | 2018-08-28 | Engine and piston device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810989730.7A CN109083762B (en) | 2018-08-28 | 2018-08-28 | Engine and piston device thereof |
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| Publication Number | Publication Date |
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| CN109083762A CN109083762A (en) | 2018-12-25 |
| CN109083762B true CN109083762B (en) | 2020-11-13 |
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| CN201810989730.7A Expired - Fee Related CN109083762B (en) | 2018-08-28 | 2018-08-28 | Engine and piston device thereof |
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| CN112879157B (en) * | 2021-01-22 | 2023-09-26 | 浙江凯吉汽车零部件制造有限公司 | Engine capable of improving compression ratio |
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| CN203009064U (en) * | 2012-08-18 | 2013-06-19 | 唐明龙 | Self-pumping compression ratio adjustable engine piston |
| CN104612962A (en) * | 2015-01-30 | 2015-05-13 | 郑州航空工业管理学院 | Variable-displacement piston oil delivery pump and variable-flow low-pressure oil supplying device |
| DE102013225990A1 (en) * | 2013-12-16 | 2015-06-18 | Schaeffler Technologies AG & Co. KG | Piston for a variable compression ratio having internal combustion engine |
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN105626258A (en) * | 2016-03-16 | 2016-06-01 | 吉林大学 | Hydraulic-drive type variable-compression-ratio piston connection rod assembly |
| CN105927396A (en) * | 2016-06-07 | 2016-09-07 | 吉林大学 | Piston-and-connecting-rod assembly adopting novel compression ratio |
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2018
- 2018-08-28 CN CN201810989730.7A patent/CN109083762B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203009064U (en) * | 2012-08-18 | 2013-06-19 | 唐明龙 | Self-pumping compression ratio adjustable engine piston |
| DE102013225990A1 (en) * | 2013-12-16 | 2015-06-18 | Schaeffler Technologies AG & Co. KG | Piston for a variable compression ratio having internal combustion engine |
| CN104612962A (en) * | 2015-01-30 | 2015-05-13 | 郑州航空工业管理学院 | Variable-displacement piston oil delivery pump and variable-flow low-pressure oil supplying device |
| CN105370417A (en) * | 2015-12-07 | 2016-03-02 | 吉林大学 | Piston with variable lift compression ratio |
| CN105626258A (en) * | 2016-03-16 | 2016-06-01 | 吉林大学 | Hydraulic-drive type variable-compression-ratio piston connection rod assembly |
| CN105927396A (en) * | 2016-06-07 | 2016-09-07 | 吉林大学 | Piston-and-connecting-rod assembly adopting novel compression ratio |
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| CN109083762A (en) | 2018-12-25 |
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