CN115324729B - Vehicle engine compression ratio adjusting device and vehicle - Google Patents
Vehicle engine compression ratio adjusting device and vehicle Download PDFInfo
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- CN115324729B CN115324729B CN202211073575.7A CN202211073575A CN115324729B CN 115324729 B CN115324729 B CN 115324729B CN 202211073575 A CN202211073575 A CN 202211073575A CN 115324729 B CN115324729 B CN 115324729B
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- 230000006835 compression Effects 0.000 title claims abstract description 71
- 238000007906 compression Methods 0.000 title claims abstract description 71
- 238000004891 communication Methods 0.000 claims description 18
- 230000004308 accommodation Effects 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 271
- 238000010586 diagram Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to the technical field of vehicles, and particularly discloses a vehicle engine compression ratio adjusting device and a vehicle. The compression ratio adjusting device of the vehicle engine adopts a split type connecting rod structure, and the upper part of the connecting rod is controlled to rotate along a spiral line relative to the lower part of the connecting rod by virtue of hydraulic pressure, so that the length and the compression ratio of the whole connecting rod are adjusted, and the response speed is high; the plurality of sliding blocks and the accommodating grooves corresponding to the sliding blocks are arranged, so that the stability and the reliability of the rotation of the upper part of the connecting rod are improved; the vehicle engine compression ratio adjusting device provided by the invention has the advantages that the structures of the small head end at the upper part of the connecting rod and the large head end at the lower part of the connecting rod are not changed, the interchangeability with the original machine is strong, and the local structural strength and the durability reliability of the connecting rod are high; in addition, the vehicle engine compression ratio adjusting device provided by the invention can change the size of the sliding block and the accommodating groove, adjust the variation range of the compression ratio such as the spiral curve of the accommodating groove and the like, and has strong use flexibility.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle engine compression ratio adjusting device and a vehicle.
Background
The compression ratio of the engine is the ratio of the cylinder volume when the piston moves to the bottom dead center to the cylinder volume when the piston moves to the top dead center, and the increase of the compression ratio can effectively improve the thermal efficiency of the engine. In general, the higher the compression ratio of the engine, the longer the piston working stroke, the more work is done, and the greater the output power. However, excessive compression ratio in gasoline engines can lead to uncontrolled combustion, damaging the engine and being prone to knocking when the load is relatively large; the excessive compression ratio in the diesel engine leads to the excessive high pressure of the cylinder of the diesel engine, so that the vibration noise is aggravated, and the impact load born by the moving parts is increased, thereby influencing the working reliability and the service life of the diesel engine. In order to avoid the above situation, a variable compression ratio technology is introduced, and this technology is considered as one of the most effective means for improving the thermal efficiency of the engine and improving the fuel economy, and can increase the compression ratio at the time of low rotation, thereby improving the thermal efficiency of the engine; the compression ratio is reduced during high rotation, and the knocking of the gasoline engine and the rough operation of the diesel engine are reduced.
However, in the prior art, the response speed of the compression ratio adjusting device of the engine is slower, and the compression ratio adjusting device is only suitable for the condition that the working conditions of high and low rotation speeds are not frequently switched in the running process of the engine. Or the compression ratio adjusting device of the engine has difficulty in space arrangement in the diesel engine, meanwhile, the explosion pressure of the diesel engine is high, and two sets of hydraulic piston rocker arm systems are arranged in a limited space on the small end of the connecting rod, so that the local structural strength and the durability and the reliability of the connecting rod can be weakened.
Accordingly, there is a need to provide a vehicle engine compression ratio adjusting device to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims to provide a vehicle engine compression ratio adjusting device and a vehicle, which are simple in adjusting structure, high in corresponding speed, free of occupying small head space of a connecting rod and high in interchangeability with an original machine.
To achieve the purpose, the invention adopts the following technical scheme:
a vehicle engine compression ratio adjustment device comprising:
the first end of the upper part of the connecting rod is a small head end, and the second end of the upper part of the connecting rod is provided with at least two sliding blocks at intervals along the circumferential direction;
the connecting rod lower part, the first end of connecting rod lower part is big head end, the second end of connecting rod lower part is equipped with the holding chamber of holding connecting rod upper portion second end, the holding chamber lateral wall is followed the axial spiral of connecting rod lower part is equipped with the holding tank, the holding tank with the slider one-to-one, just the slider slip set up in the holding tank, the slider will the holding tank separates into two isolated control chamber, every the control chamber is connected with the oil circuit unit respectively, the oil circuit unit be configured to control intracavity fuel feeding or make the control chamber oil return, so as to drive the slider is in the holding tank removes and makes connecting rod upper portion relatively the connecting rod lower part rotates.
As an alternative technical solution of the compression ratio adjusting device for a vehicle engine, two control chambers in each accommodating groove are respectively defined as a first control chamber and a second control chamber, when oil is injected into the first control chamber, the upper part of the connecting rod rotates anticlockwise relative to the lower part of the connecting rod, when oil is injected into the second control chamber, the upper part of the connecting rod rotates clockwise relative to the lower part of the connecting rod, a plurality of first control chambers are connected with one oil path unit, and a plurality of second control chambers are connected with one oil path unit.
As an alternative aspect of the above-mentioned vehicle engine compression ratio adjusting device, the oil path unit includes:
the control device comprises a plurality of control cavities, wherein each control cavity is correspondingly communicated with a cavity oil circuit;
the communication oil way is communicated with a plurality of cavity oil ways;
an oil inlet oil path communicated with the communication oil path;
and the oil return oil way is communicated with the communication oil way.
As an alternative aspect of the vehicle engine compression ratio adjusting device described above, the vehicle engine compression ratio adjusting device further includes a reversing valve unit configured to control oil injection into one of the first control chamber and the second control chamber and return oil into the other of the first control chamber and the second control chamber.
As an alternative aspect of the above-described vehicle engine compression ratio adjusting device, the reversing valve unit includes:
the valve core is arranged in an inner cavity formed in the lower portion of the connecting rod in a sliding mode, the inner cavity is divided into a first cavity and a second cavity by the valve core, a reset piece which enables the valve core to compress the second cavity is arranged in the first cavity, a first oil inlet groove, a second oil inlet groove, a first oil return groove and a second oil return groove are formed in the valve core, the first oil inlet groove and the second oil return groove are corresponding and are arranged at intervals along the circumferential direction of the valve core, and the second oil inlet groove and the first oil return groove are corresponding and are arranged at intervals along the circumferential direction of the valve core;
a spool control assembly configured to control movement of the spool along the interior cavity,
the valve core moves to enable the first oil inlet groove or the second oil inlet groove to be communicated with the reversing valve oil inlet cavity and the oil filling port of the first control cavity or the oil filling port of the second control cavity;
the reversing valve oil inlet path is communicated with the reversing valve oil inlet cavity;
the first reversing valve oil return channel is used for communicating the first end of the first reversing valve oil return channel with the oil return port of the second control cavity when the reversing valve oil inlet cavity is communicated with the first oil inlet groove;
and when the reversing valve oil inlet cavity is communicated with the second oil inlet groove, the first oil return groove is communicated with the first end of the second reversing valve oil return channel and the oil return port of the first control cavity.
As an optional technical scheme of the vehicle engine compression ratio adjusting device, the valve core control assembly comprises a control oil circuit, one end of the control oil circuit is communicated with the second cavity, the other end of the control oil circuit is connected with an oil supply device, and a control valve is arranged on the control oil circuit.
As an optional technical scheme of the vehicle engine compression ratio adjusting device, the reversing valve unit further comprises a reversing valve main oil return channel, and the reversing valve main oil return channel is respectively communicated with the second end of the first reversing valve oil return channel and the second end of the second reversing valve oil return channel.
As an optional technical scheme of the vehicle engine compression ratio adjusting device, the second end of the upper part of the connecting rod and the accommodating cavity are arranged at intervals to form an oil return cavity, and the oil return cavity is communicated with an oil return cavity oil way.
As an optional technical scheme of the vehicle engine compression ratio adjusting device, the second end of the lower part of the connecting rod is provided with a first arc-shaped part, the second end of the lower part of the connecting rod is detachably connected with a second arc-shaped part, and the second arc-shaped part and the first arc-shaped part enclose to form the accommodating cavity.
A vehicle comprising the vehicle engine compression ratio adjustment device of any one of the above.
The invention has the beneficial effects that:
the compression ratio adjusting device of the vehicle engine adopts a split type connecting rod structure, and the upper part of the connecting rod is controlled to rotate along a spiral line relative to the lower part of the connecting rod by virtue of hydraulic pressure, so that the length and the compression ratio of the whole connecting rod are adjusted, and the response speed is high; the plurality of sliding blocks and the accommodating grooves corresponding to the sliding blocks are arranged, so that the stability and the reliability of the rotation of the upper part of the connecting rod are improved; the vehicle engine compression ratio adjusting device provided by the invention has the advantages that the structures of the small head end at the upper part of the connecting rod and the large head end at the lower part of the connecting rod are not changed, the interchangeability with the original machine is strong, and the local structural strength and the durability reliability of the connecting rod are high; in addition, the vehicle engine compression ratio adjusting device provided by the invention can change the size of the sliding block and the accommodating groove, adjust the variation range of the compression ratio such as the spiral curve of the accommodating groove and the like, and has strong use flexibility.
Drawings
Fig. 1 is a first schematic structural diagram of an oil path unit according to an embodiment of the present invention;
fig. 2 is a second schematic structural view of an oil path unit according to an embodiment of the present invention;
fig. 3 is a schematic view of a first structure of a reversing valve unit according to an embodiment of the present invention;
fig. 4 is a second schematic structural view of a reversing valve unit according to an embodiment of the present invention;
FIG. 5 is a schematic view of a first view of a valve element according to an embodiment of the present invention
FIG. 6 is a schematic view of a second view of a valve element according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a valve element according to a third aspect of the present invention;
fig. 8 is a schematic structural diagram of a first oil inlet groove in communication with an oil inlet path of a first control chamber according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of communication between a second oil return groove and an oil return path of a second control chamber according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a first structure of oil return of the reversing valve according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a second structure of the reversing valve for oil return according to an embodiment of the present invention;
FIG. 12 is a schematic view of a partial structure of a lower portion of a connecting rod according to an embodiment of the present invention;
FIG. 13 is a schematic view of a second arcuate component provided in accordance with an embodiment of the present invention;
fig. 14 is a schematic view of the structure of the upper part of the connecting rod according to the embodiment of the present invention.
In the figure:
1. the upper part of the connecting rod; 2. tightening the cap; 3. the lower part of the connecting rod; 4. a housing; 5. a valve core; 6. an inner cavity; 7. a seal ring; 8. controlling an oil path; 9. a control valve; 10. an oil inlet path of the reversing valve; 11. a one-way valve; 12. a reversing valve plug; 13. a reset member; 14. a second arcuate member; 15. an oil return cavity; 16. an oil return cavity oil way; 17. an oil inlet cavity of the reversing valve; 18. the oil return cavity is provided with a main oil return channel; 19. a buffer cavity; 20. buffer cavity plugs; 21. an oil return cavity plug; 22. a slide block; 23. a cavity oil path; 24. a first arcuate member; 25. a communication oil path; 26. an oil inlet oil path; 27. an oil return path; 28. a communicating oil way plug; 30. a cavity oil way plug; 31. a receiving groove; 32. a receiving chamber; 33. a first control chamber; 34. a second control chamber; 40. a first oil inlet groove; 41. a second oil inlet groove; 43. a second oil return groove; 44. a first oil return groove; 45. the first reversing valve returns oil; 46. the second reversing valve returns oil; 47. reversing valve oil return cavity; 48. the reversing valve is provided with a main oil return channel.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
As shown in fig. 1 to 4 and 12, the present embodiment provides a vehicle engine compression ratio adjusting device including a link upper portion 1 and a link lower portion 3. The first end of the upper connecting rod part 1 is a small head end, and the second end of the upper connecting rod part 1 is provided with at least two sliding blocks 22 at intervals along the circumferential direction. The first end of connecting rod lower part 3 is big head end, the second end of connecting rod lower part 3 is equipped with the accommodation chamber 32 that holds connecting rod upper portion 1 second end, the axial spiral of accommodation chamber 32 lateral wall along the connecting rod lower part is equipped with accommodation groove 31, accommodation groove 31 and slider 22 one-to-one, and slider 22 slides and set up in accommodation groove 31, slider 22 separates accommodation groove 31 into two isolated control chamber, every control chamber is connected with the oil circuit unit respectively, the oil circuit unit is configured to the oil supply of control intracavity or make the control chamber return oil, in order to drive slider 22 remove in accommodation groove 31 and make connecting rod upper portion 1 rotate relative connecting rod lower part 3.
The compression ratio adjusting device of the vehicle engine provided by the embodiment adopts a split type connecting rod structure, and the upper part 1 of the connecting rod is controlled to rotate along a spiral line relative to the lower part 3 of the connecting rod by virtue of hydraulic pressure, so that the adjustment of the length and the compression ratio of the whole connecting rod is realized, and the response speed is high; the plurality of sliding blocks 22 and the accommodating grooves 31 corresponding to the sliding blocks 22 are arranged, so that the stability and the reliability of the rotation of the upper part 1 of the connecting rod are improved; the vehicle engine compression ratio adjusting device provided by the embodiment does not change the structures of the small head end of the upper part 1 of the connecting rod and the large head end of the lower part 3 of the connecting rod, has strong interchangeability with the original machine, and has high local structural strength and durability reliability of the connecting rod; in addition, the vehicle engine compression ratio adjusting device provided in this embodiment can change the size of the slider 22 and the accommodating groove 31, and adjust the variation range of the compression ratio such as the spiral curve of the accommodating groove 31, and has strong flexibility in use.
In the present embodiment, since the plurality of accommodating grooves 31 are provided, each accommodating groove 31 corresponds to two control chambers, respectively, the two control chambers of each accommodating groove 31 are defined as the first control chamber 33 and the second control chamber 34, respectively. When the first control chambers 33 are filled with oil, the upper link portion 1 is rotated counterclockwise relative to the lower link portion 3, and the first control chambers 33 are filled with oil simultaneously, and the second control chambers 34 are filled with oil simultaneously. The injection of oil into the second control chambers 34 rotates the link upper portion 1 clockwise with respect to the link lower portion 3, and simultaneously injects oil into the plurality of second control chambers 34 and returns oil into the plurality of first control chambers 33. The plurality of first control cavities 33 are connected with an oil way unit, the plurality of second control cavities 34 are connected with an oil way unit, synchronous oiling or oil return to the plurality of first control cavities 33 or the plurality of second control cavities 34 is realized, and the rotating stability of the upper part 1 of the connecting rod is improved. And the plurality of first control chambers 33 share one oil path unit and the plurality of second control chambers 34 share one oil path unit, the structure is simplified.
Illustratively, in this embodiment, the side wall of the accommodating cavity 32 is provided with two accommodating grooves 31, two sliders 22 with the same size are provided on the corresponding upper portion 1 of the connecting rod, and the two sliders 22 are symmetrically arranged relative to the axis of the upper portion 1 of the connecting rod, the two accommodating grooves 31 are the same in size, the two accommodating grooves 31 are oppositely arranged, and the directions of the spirals of the two accommodating grooves 31 are the same. The two sliding blocks 22 and the two accommodating grooves 31 are arranged, so that the stability and the reliability of the rotation of the upper connecting rod part 1 can be ensured, and the connecting structure of the upper connecting rod part 1 and the lower connecting rod part 3 can not be complicated. Each of the receiving grooves 31 is provided with a first control chamber 33 and a second control chamber 34, respectively.
In the present embodiment, as shown in fig. 1 and 2, the oil passage unit includes a cavity oil passage 23, a communication oil passage 25, an oil intake oil passage 26, and an oil return oil passage 27. The cavity oil way 23 is provided with a plurality of control cavities, each control cavity is correspondingly communicated with the cavity oil way 23, and oil or return oil is injected into the corresponding control cavity through the cavity oil way 23. The communication oil passage 25 communicates with the plurality of cavity oil passages 23, and the oil intake oil passage 26 and the oil return oil passage 27 communicate with the communication oil passage 25, respectively. When the oil is injected into the control cavity, the oil enters the cavity oil paths 23 through the oil inlet oil path 26 and the communication oil path 25, and then enters the corresponding control cavity. When the control chamber is returned, the oil in the control chamber is discharged through the chamber oil passage 23, the communication oil passage 25, and the return oil passage 27. The structure of the oil path unit provided in this embodiment achieves synchronization of oil injection or oil return into the plurality of first control chambers 33 or the plurality of second control chambers 34.
For ease of processing, one end of the cavity oil path 23 is communicated with the outside environment, and the end is sealed off by using a cavity oil path plug 30. During processing, one end of the communication oil passage 25 communicates with the external environment, and the end is sealed off by using the communication oil passage plug 28.
In order to achieve real-time switching of the high and low compression ratios of the engine, in the present embodiment, as shown in fig. 3 and 4, the vehicle engine compression ratio adjusting device further includes a reversing valve unit configured to control oil injection to one of the first control chamber 33 and the second control chamber 34, return oil to the other of the first control chamber 33 and the second control chamber 34, and enable real-time switching to adjust the compression ratio, with a high response speed.
Specifically, in some embodiments, the reversing valve unit includes a valve core 5, the lower portion 3 of the connecting rod is provided with an inner cavity 6, the valve core 5 is slidably disposed in the inner cavity 6, the valve core 5 divides the inner cavity 6 into a first cavity and a second cavity, and a reset member 13 for compressing the valve core 5 in the second cavity is disposed in the first cavity. In order to facilitate the installation of the valve core 5, the inner cavity 6 is a cavity communicated with the external environment, namely, the surface of the shell 4 of the lower part 3 of the connecting rod is provided with the inner cavity 6. One side of the inner cavity 6 communicated with the external environment is a first cavity, and the other side of the valve core 5 is a second cavity. In order to be convenient for fix the reset piece 13 and realize the leakproofness of second cavity, be equipped with switching-over valve end cap 12 in the opening part of inner chamber 6, the one end of reset piece 13 supports on case 5, and the other end supports on switching-over valve end cap 12, and reset piece 13 has the trend of making case 5 compress the second cavity. In this embodiment, the return member 13 is a spring.
As shown in fig. 3 to 11, the valve element 5 is provided with a first oil inlet groove 40, a second oil inlet groove 41, a first oil return groove 42 and a second oil return groove 43. The first oil inlet groove 40 and the second oil return groove 43 correspond to each other and are arranged at intervals along the circumferential direction of the valve core 5, and the second oil inlet groove 41 and the first oil return groove 42 correspond to each other and are arranged at intervals along the circumferential direction of the valve core 5. The reversing valve unit further comprises a valve core control assembly, a reversing valve oil inlet cavity 17, a reversing valve oil inlet path 10, a first reversing valve oil return path 45 and a second reversing valve oil return path 46, wherein the reversing valve oil inlet path 10 is communicated with the reversing valve oil inlet cavity 17. The spool control assembly is configured to control movement of the spool 5 along the interior cavity 6. The valve core 5 moves to enable the first oil inlet groove 40 to be communicated with oil filling ports of the reversing valve oil inlet cavity 17 and the first control cavity 33, or enable the second oil inlet groove 41 to be communicated with oil filling ports of the reversing valve oil inlet cavity 17 and the second control cavity 34. When the reversing valve oil feed chamber 17 communicates with the first oil feed groove 40, the second oil return groove 43 communicates with the first end of the first reversing valve oil return path 45 and the oil return port of the second control chamber 34 to rotate the link upper portion 1 counterclockwise with respect to the link lower portion 3. When the reversing valve oil feed chamber 17 communicates with the second oil feed groove 41, the first oil return groove 44 communicates the first end of the second reversing valve oil return path 46 with the oil return port of the first control chamber 33 to rotate the link upper portion 1 clockwise with respect to the link lower portion 3.
In this embodiment, one reversing valve unit is used to control oil injection and oil return of the plurality of first control chambers 33 and the plurality of second control chambers 34, so that the structure of the compression ratio adjusting device of the vehicle engine is simplified.
A sealing ring 7 is arranged on one side, close to the inner cavity 6, of the reversing valve oil inlet cavity 17, and the sealing ring 7 can ensure that effective sealing is realized when the reversing valve oil inlet cavity 17 is selectively communicated with the first oil inlet groove 40 and the second oil inlet groove 41 on the valve core 5.
In this embodiment, when the upper link portion 1 rotates counterclockwise relative to the lower link portion 3, the upper link portion 1 rises spirally relative to the lower link portion 3 until the slider 22 abuts against the side wall of the second control chamber 34, at which time the overall link is longest, the distance between the piston surface and the large head end of the lower link portion 3 is maximized, the compression ratio of the engine reaches a set maximum value, and the engine operates stably at the compression ratio by the incompressible hydraulic oil. When the upper link part 1 rotates clockwise relative to the lower link part 3, the upper link part 1 descends spirally relative to the lower link part 3 until the slide 22 is attached to the side wall of the first control chamber 33, at this time, the whole link is shortest, the distance between the piston surface and the large head end of the lower link part 3 is smallest, the compression ratio of the engine reaches a set minimum value, and the engine stably operates at the compression ratio under the action of incompressible hydraulic oil.
It should be noted that, as shown in fig. 3, 8 and 9, the reversing valve oil inlet chamber 17 always maintains an oil inlet state during the compression ratio change. And further, a one-way valve 11 is arranged on the reversing valve oil inlet path 10, the one-way valve 11 enables oil to flow into the reversing valve oil inlet cavity 17, oil pressure in the reversing valve oil inlet cavity 17 is ensured to be stable, and then the compression ratio of the engine is in a stable state.
The valve core control assembly controls the valve core 5 to move in the inner cavity 6, specifically, in some embodiments, the valve core control assembly comprises a control oil circuit 8, one end of the control oil circuit 8 is communicated with the second cavity, the other end of the control oil circuit 8 is connected with an oil supply device, and a control valve 9 is arranged on the control oil circuit 8. The control valve 9 is opened, oil is filled into the first cavity through the control oil way 8, the valve core 5 is pushed to compress the first cavity, the reset piece 13 is compressed, the first oil inlet groove 40 is communicated with the reversing valve oil inlet cavity 17 and the oil filling port of the first control cavity 33, and the second oil return groove 44 is communicated with the first end of the first reversing valve oil return way 45 and the oil return port of the second control cavity 34. When the control valve 9 is opened, and oil is not injected into the first cavity, the reset piece 13 resets and pushes the valve core 5 to compress the first cavity, so that oil in the first cavity is discharged through the control oil way 8, the second oil inlet groove 41 is communicated with the oil injection ports of the reversing valve oil inlet cavity 17 and the second control cavity 34, and the first oil return groove 44 is communicated with the first end of the second reversing valve oil return way 46 and the oil return port of the first control cavity 33.
To further simplify the structure, as shown in fig. 10 and 11, the reversing valve unit further includes a reversing valve main oil return 48, the reversing valve main oil return 48 being provided on the link lower portion 3, the reversing valve main oil return 48 being in communication with the second end of the first reversing valve oil return 45 and the second end of the second reversing valve oil return 46, respectively. The oil discharged through the first direction valve oil return path 45 and the second direction valve oil return path 46 is discharged through the direction valve main oil return path 48.
The lower part 3 of the connecting rod is also provided with a reversing valve oil return cavity 47, and the reversing valve oil return cavity 47 is respectively communicated with the first reversing valve oil return channel 45, the second reversing valve oil return channel 46 and the reversing valve main oil return channel 48 and is used for temporarily storing oil so as to avoid the influence on the response speed of the compression ratio adjustment caused by the fact that the reversing valve main oil return channel 48 cannot timely discharge oil.
In this embodiment, as shown in fig. 4, the second end of the upper portion 1 of the connecting rod is spaced from the accommodating cavity 32 to form an oil return cavity 15, and the oil return cavity 15 is communicated with an oil return cavity oil path 16, so as to drain the leaked oil and not to affect the normal adjustment of the compression ratio of the engine. The exuded oil enters the oil return chamber 15 and is discharged through the oil return chamber oil passage 16. The oil return chamber oil passage 16 is provided on the link lower portion 3.
The lower part 3 of the connecting rod is also provided with a buffer cavity 19 and an oil return cavity main oil return channel 18, the oil return cavity main oil return channel 18 is communicated with the oil return cavity oil channel 16, the buffer cavity 19 is communicated with the oil return cavity main oil return channel 18, the buffer cavity 19 achieves the purpose of temporarily storing oil, and the problem that the response speed of compression ratio adjustment is affected because the oil return cavity main oil return channel 18 cannot timely discharge oil is avoided.
In order to facilitate processing of the buffer cavity, one end of the processed buffer cavity 19 is communicated with the external environment, the other end of the processed buffer cavity is communicated with the main oil return channel 18 of the oil return cavity, and one end of the buffer cavity 19 communicated with the external environment is sealed and plugged through the buffer cavity plug 20.
In order to facilitate processing of the oil return cavity oil way 16, one end of the oil return cavity oil way 16 is communicated with the oil return cavity 15, the other end is communicated with the external environment, and the end is sealed and blocked by an oil return cavity plug 21.
As shown in fig. 12-14, in order to facilitate the installation of the upper link portion 1 on the lower link portion 3, the slider 22 is inserted into the accommodating groove 31, in this embodiment, the second end of the lower link portion 3 is provided with the first arc-shaped member 24, and the second end of the lower link portion 3 is detachably connected with the second arc-shaped member 14, and the accommodating cavity 32 is defined by the second arc-shaped member 14 and the first arc-shaped member 24.
In this embodiment, two accommodating grooves 31 are formed on the side wall of the accommodating cavity 32, one accommodating groove 31 is formed on the first arc-shaped component 24, the other accommodating groove 31 is formed on the second arc-shaped component 14, when the upper portion 1 of the connecting rod is installed on the lower portion 3 of the connecting rod, one of the sliding blocks 22 is embedded into the accommodating groove 31 on the first arc-shaped component 24, the second arc-shaped component 14 is installed, and the other sliding block 22 is embedded into the accommodating groove 31 of the second arc-shaped component 14.
Further, after the second arcuate member 14 is coupled to the first arcuate member 24, it is compressed by the tightening cap 2 to seal the receiving cavity 32 therein (tightening cap 2 is shown in FIG. 3).
For example, when the engine compression ratio adjusting device provided in this embodiment is used, oil is injected into the first cavity, so that the valve core 5 compresses the second cavity, the valve core 5 moves to enable the first oil inlet groove 40 to communicate the oil inlet opening of the reversing valve oil inlet cavity 17 and the oil inlet opening of the first control cavity 33, and the second oil return groove 43 communicates the first end of the first reversing valve oil return channel 45 and the oil return opening of the second control cavity 34, so that the upper connecting rod 1 rotates anticlockwise relative to the lower connecting rod 3, the upper connecting rod 1 rises spirally relative to the lower connecting rod 3 until the sliding block 22 is attached to the side wall of the second control cavity 34, at this time, the whole connecting rod is longest, and the distance between the piston surface and the large end of the lower connecting rod 3 is the largest, so that the compression ratio of the engine reaches the set maximum value.
The oil is not injected into the first cavity, the reset piece 13 resets and pushes the valve core 5 to compress the second cavity, the valve core 5 moves to enable the second oil inlet groove 41 to be communicated with the oil inlet of the reversing valve oil inlet cavity 17 and the oil inlet of the second control cavity 34, the first oil return groove 44 is communicated with the first end of the second reversing valve oil return channel 46 and the oil return opening of the first control cavity 33, so that the upper connecting rod 1 rotates clockwise relative to the lower connecting rod 3, the upper connecting rod 1 descends spirally relative to the lower connecting rod 3 until the sliding block 22 is attached to the side wall of the first control cavity 33, at the moment, the whole connecting rod is shortest, the distance between the piston surface and the big end of the lower connecting rod 3 is minimum, and the compression ratio of the engine reaches a set minimum value.
The embodiment also provides a vehicle, which comprises the vehicle engine compression ratio adjusting device.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A vehicle engine compression ratio adjusting apparatus characterized by comprising:
the connecting rod comprises a connecting rod upper part (1), wherein a first end of the connecting rod upper part (1) is a small head end, and a second end of the connecting rod upper part (1) is provided with at least two sliding blocks (22) at intervals along the circumferential direction;
connecting rod lower part (3), the first end of connecting rod lower part (3) is big head end, the second end of connecting rod lower part (3) is equipped with holds chamber (32) of connecting rod upper portion (1) second end, hold chamber (32) lateral wall along the axial spiral of connecting rod lower part (3) is equipped with holding tank (31), holding tank (31) with slider (22) one-to-one, just slider (22) slide set up in holding tank (31), slider (22) will holding tank (31) separate into two isolated control chamber, every control chamber is connected with the oil circuit unit respectively, the oil circuit unit be configured to control intracavity fuel feeding or make control chamber oil return, so as to drive slider (22) are in the holding tank removes and makes connecting rod upper portion (1) are relative connecting rod lower part (3) rotate.
2. The vehicle engine compression ratio adjusting device according to claim 1, wherein two control chambers in each of the accommodation grooves (31) are defined as a first control chamber (33) and a second control chamber (34), respectively, the upper link portion (1) is rotated counterclockwise with respect to the lower link portion (3) when the oil is injected into the first control chamber (33), the upper link portion (1) is rotated clockwise with respect to the lower link portion (3) when the oil is injected into the second control chamber (34), and one of the oil path units is connected to a plurality of the first control chambers (33), and one of the oil path units is connected to a plurality of the second control chambers (34).
3. The vehicle engine compression ratio adjusting device according to claim 2, characterized in that the oil passage unit includes:
the cavity oil ways (23) are provided with a plurality of control cavities, and each control cavity is correspondingly communicated with the cavity oil way (23);
a communication oil path (25) for communicating a plurality of the cavity oil paths (23);
an oil inlet passage (26) which communicates with the communication passage (25);
and an oil return passage (27) which is communicated with the communication passage (25).
4. The vehicle engine compression ratio adjusting device according to claim 2, further comprising a reversing valve unit configured to control oil injection to one of the first control chamber (33) and the second control chamber (34) and return oil to the other of the first control chamber (33) and the second control chamber (34).
5. The vehicle engine compression ratio adjusting device according to claim 4, characterized in that the reversing valve unit includes:
the valve core (5) is arranged in an inner cavity (6) formed in the lower portion (3) of the connecting rod in a sliding mode, the inner cavity (6) is divided into a first cavity and a second cavity by the valve core (5), a reset piece (13) which enables the valve core (5) to compress the second cavity is arranged in the first cavity, a first oil inlet groove (40), a second oil inlet groove (41), a first oil return groove (44) and a second oil return groove (43) are formed in the valve core (5), the first oil inlet groove (40) and the second oil return groove (43) correspond to each other and are arranged at intervals along the circumferential direction of the valve core (5), and the second oil inlet groove (41) and the first oil return groove (44) correspond to each other and are arranged at intervals along the circumferential direction of the valve core (5);
a spool control assembly configured to control movement of the spool (5) along the interior cavity (6),
a reversing valve oil inlet cavity (17), wherein the valve core (5) can enable the first oil inlet groove (40) or the second oil inlet groove (41) to be communicated with the reversing valve oil inlet cavity (17) and an oil filling port of the first control cavity (33) or an oil filling port of the second control cavity (34);
the reversing valve oil inlet path (10) is communicated with the reversing valve oil inlet cavity (17);
the first reversing valve oil return channel (45), when the reversing valve oil inlet cavity (17) is communicated with the first oil inlet groove (40), the second oil return groove (43) is communicated with the first end of the first reversing valve oil return channel (45) and the oil return port of the second control cavity (34);
and when the reversing valve oil inlet cavity (17) is communicated with the second oil inlet groove (41), the first oil return groove (44) is communicated with the first end of the second reversing valve oil return channel (46) and the oil return port of the first control cavity (33).
6. The vehicle engine compression ratio adjusting device according to claim 5, characterized in that the valve element control assembly comprises a control oil path (8), one end of the control oil path (8) is communicated with the second cavity, the other end of the control oil path (8) is connected with an oil supply device, and a control valve (9) is arranged on the control oil path (8).
7. The vehicle engine compression ratio adjusting device according to claim 5, characterized in that the reversing valve unit further includes a reversing valve main oil return (48), the reversing valve main oil return (48) being in communication with the second end of the first reversing valve oil return (45) and the second end of the second reversing valve oil return (46), respectively.
8. The vehicle engine compression ratio adjusting device according to claim 1, wherein the second end of the connecting rod upper portion (1) and the accommodating cavity (32) are arranged at intervals to form an oil return cavity (15), and the oil return cavity (15) is communicated with an oil return cavity oil way (16).
9. The vehicle engine compression ratio adjusting device according to claim 1, characterized in that a first arc-shaped part (24) is arranged at the second end of the connecting rod lower part (3), a second arc-shaped part (14) is detachably connected to the second end of the connecting rod lower part (3), and the second arc-shaped part (14) and the first arc-shaped part (24) enclose to form the accommodating cavity (32).
10. A vehicle characterized by comprising the vehicle engine compression ratio adjusting apparatus according to any one of claims 1 to 9.
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| CN202211073575.7A CN115324729B (en) | 2022-09-02 | 2022-09-02 | Vehicle engine compression ratio adjusting device and vehicle |
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| CN202211073575.7A CN115324729B (en) | 2022-09-02 | 2022-09-02 | Vehicle engine compression ratio adjusting device and vehicle |
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| CN115324729A CN115324729A (en) | 2022-11-11 |
| CN115324729B true CN115324729B (en) | 2023-10-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010174761A (en) * | 2009-01-30 | 2010-08-12 | Nissan Motor Co Ltd | Variable compression ratio device for internal combustion engine |
| CN107529584A (en) * | 2017-09-30 | 2018-01-02 | 中国第汽车股份有限公司 | A kind of variable connecting rod of length |
| CN107829819A (en) * | 2017-12-15 | 2018-03-23 | 吉林大学 | Vane hydraulic drives variable compression ratio connecting rod |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060243227A1 (en) * | 2005-04-28 | 2006-11-02 | Greve Christopher G | Variable-compression engine |
| DE102005047203A1 (en) * | 2005-10-01 | 2007-04-19 | Daimlerchrysler Ag | Internal combustion engine with variable compression ratio |
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2022
- 2022-09-02 CN CN202211073575.7A patent/CN115324729B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010174761A (en) * | 2009-01-30 | 2010-08-12 | Nissan Motor Co Ltd | Variable compression ratio device for internal combustion engine |
| CN107529584A (en) * | 2017-09-30 | 2018-01-02 | 中国第汽车股份有限公司 | A kind of variable connecting rod of length |
| CN107829819A (en) * | 2017-12-15 | 2018-03-23 | 吉林大学 | Vane hydraulic drives variable compression ratio connecting rod |
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| CN115324729A (en) | 2022-11-11 |
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