CN108798890B - Variable connecting rod for adjusting compression ratio of engine by rotary valve - Google Patents
Variable connecting rod for adjusting compression ratio of engine by rotary valve Download PDFInfo
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- CN108798890B CN108798890B CN201810151739.0A CN201810151739A CN108798890B CN 108798890 B CN108798890 B CN 108798890B CN 201810151739 A CN201810151739 A CN 201810151739A CN 108798890 B CN108798890 B CN 108798890B
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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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- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, belonging to the field of engine equipment. The rotary valve body of the variable connecting rod is arranged at the bottom end of the valve sleeve; the upper end of the valve sleeve is connected with a connecting rod; the top end of the connecting rod is provided with a connecting rod body; an eccentric part is arranged in the connecting rod body; an oil duct which is communicated with each other is arranged between the connecting rod and the valve sleeve; the oil port of the rotary valve body is communicated with the oil duct in the valve sleeve; the rotary valve body rotates in the connecting rod body; the rotating valve body drives the oil to rotate through the oil duct driving eccentric part. The variable connecting rod for adjusting the compression ratio of the engine by using the rotary valve provided by the invention can realize controllable and variable effective length of the connecting rod by using the mutual operation of the rotary valve and the oil duct connected with the eccentric part, thereby changing the compression ratio of the gasoline engine, improving the partial load thermal efficiency of the gasoline engine, avoiding knocking in full load and effectively improving the reliability and the economical efficiency of the engine. The invention has simple and reliable structure, small volume, low cost and good applicability to the existing mass production machine type.
Description
Technical Field
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, belonging to the field of engine equipment.
Background
An engine is a machine capable of converting other forms of energy into mechanical energy, including, for example, internal combustion engines, gasoline engines, and the like; internal combustion engines typically convert chemical energy into mechanical energy. The engine is applicable to both the power generation device and the whole machine including the power device. The connecting rod in the engine is connected with the piston and the crankshaft, transmits acting force borne by the piston to the crankshaft, and converts reciprocating motion of the piston into rotary motion of the crankshaft.
The length of the connecting rod in the prior art is not adjustable, the compression ratio of the combustion chamber of the engine is invariable, and the contradiction between oil consumption and knocking cannot be solved. The combustion chamber of the engine with variable compression ratio has complex structure, high cost and poor reliability.
Disclosure of Invention
The present invention addresses the above deficiencies by providing a variable connecting rod for adjusting the compression ratio of an engine using a rotary valve.
The invention adopts the following technical scheme:
the variable connecting rod for adjusting the compression ratio of the engine by utilizing the rotary valve comprises a rotary valve body, a valve sleeve and a connecting rod, wherein the rotary valve body is arranged at the bottom end of the valve sleeve; the upper end of the valve sleeve is connected with a connecting rod; the top end of the connecting rod is provided with a connecting rod body; an eccentric part is arranged in the connecting rod body; an oil duct which is communicated with each other is arranged between the connecting rod and the valve sleeve; the oil port of the rotary valve body is communicated with the oil duct in the valve sleeve; the rotary valve body rotates in the connecting rod body; the rotating valve body drives the oil to rotate through the oil duct driving eccentric part.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve.A rotary valve body comprises a valve core, a gear, a first one-way valve, a second one-way valve, an annular oil duct, a first straight oil duct, a second straight oil duct, a third straight oil duct and a fourth straight oil duct; the valve core is cylindrical; a gear is arranged on one axial end face of the cylindrical valve core; a one-way valve I and a one-way valve II are arranged in the cylindrical valve core; the cylindrical valve core sealing circumferential surface is provided with an annular oil duct; two sides of the annular oil duct are respectively provided with a one-way valve I and a one-way valve II; the first check valve and the second check valve radially penetrate through the valve core; the cylindrical valve core sealing circumferential surface is respectively provided with an oil inlet end and an oil outlet end of a one-way valve I and a one-way valve II; one end of the straight oil duct I is communicated with the annular oil duct, and the other end of the straight oil duct I extends to the one-way valve along the axial direction of the valve core in a straight line mode and is flush with the outlet end of the one-way valve I; one end of the straight oil duct II is communicated with the annular oil duct, and one end of the straight oil duct II linearly extends to the check valve II along the axial direction of the valve core and is flush with the outlet end of the check valve II; one end of the straight oil duct III is communicated with the annular oil duct, and the other end of the straight oil duct III is communicated with the inlet end of the check valve II; one end of the straight oil duct IV is communicated with the annular oil duct, and the other end of the straight oil duct IV is communicated with the inlet end of the one-way valve I.
The variable connecting rod for adjusting the compression ratio of the engine by using the rotary valve has the advantages that the included angle between the first check valve and the second check valve is 45-135 degrees.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, wherein a valve sleeve comprises a valve sleeve shell, and an inner arc-shaped structure is arranged in the valve sleeve shell; the lower end of the inner arc structure is provided with a valve sleeve inner hole for placing the rotary valve body; a main oil duct is arranged in the inner arc-shaped structure, and a first inclined oil duct and a second inclined oil duct are respectively arranged on two sides of the main oil duct; a positioning hole matched with the positioning device in the valve core is arranged in the inner hole of the valve sleeve; the main oil duct is communicated with an annular oil duct in the valve core; the first inclined oil duct is communicated with the outlet end of the first check valve; and the second inclined oil duct is communicated with the outlet end of the second one-way valve.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, which also comprises a deflector rod; a through hole is formed in the inner hole of the valve sleeve, a blocking piece is arranged at the position, located on the valve core, in the inner hole of the valve sleeve, and the gear is embedded into the blocking piece; a thin baffle is arranged on the inner wall of the inner hole of the valve sleeve opposite to the other end of the gear; the deflector rod extends from the through hole to the inner hole of the valve sleeve to be meshed with the gear of the valve core.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, which comprises a connecting rod body, wherein an eccentric part is arranged in the connecting rod body, and an inwards concave oil cavity is arranged on the circumference of the eccentric part; a limiting piece is arranged in the oil cavity and divides the oil cavity into a first hydraulic cavity and a second hydraulic cavity; one end of a first oil duct in the connecting rod is communicated with the first hydraulic cavity, and the other end of the first oil duct is communicated with a second inclined oil duct; one end of the second oil duct is communicated with the second hydraulic cavity, and the other end of the second oil duct is communicated with the first inclined oil duct; the limiting piece is consistent with the eccentric part in the radial direction.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, wherein an annular groove is arranged on the sealing circumferential surface of a valve core; the valve sleeve shell relative to the annular groove is provided with a screw hole, and a screw is screwed in the screw hole.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, wherein a limiting piece is in a convex shape; the convex surface of the limiting piece is in contact with the inner wall of the oil cavity; a plug is arranged in the connecting rod body; a spring is arranged between the plug and the limiting piece; the spring presses and keeps the convex surface of the limiting piece in close contact with the inner wall of the oil cavity.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, wherein a positioning device comprises a long hole arranged in a valve core along the radial direction; a compression spring is arranged in the long hole; a steel ball is arranged at the hole of the long hole; the compression spring presses the steel ball outwards.
The invention relates to a variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve, wherein an angle groove is formed in the other axial end surface of a valve core arrangement gear.
Advantageous effects
The variable connecting rod for adjusting the compression ratio of the engine by using the rotary valve provided by the invention can realize controllable and variable effective length of the connecting rod by using the mutual operation of the rotary valve and the oil duct connected with the eccentric part, thereby changing the compression ratio of the gasoline engine, improving the partial load thermal efficiency of the gasoline engine, avoiding knocking in full load and effectively improving the reliability and the economical efficiency of the engine. The invention has simple and reliable structure, small volume, low cost and good applicability to the existing mass production machine type.
Drawings
FIG. 1a is a schematic view of a one-way valve according to the present invention;
FIG. 1b is another schematic view of the check valve of the present invention;
FIG. 2 is an axial cross-sectional view of a rotary valve of the present invention;
FIG. 3 is a schematic view of the engagement structure of the valve core and the rack of the present invention;
FIG. 4 is a schematic view of the connection between the valve core and the shift lever according to the present invention;
FIG. 5 is a schematic view of the cross-sectional structure of N-N in FIG. 2;
fig. 6 is a schematic view of the valve housing of the present invention;
FIG. 7 is a schematic view of a valve core and a valve sleeve of the present invention;
FIG. 8 is a schematic view of the valve sleeve inner core mounting structure of the present invention;
FIG. 9 is a schematic view of the cross-sectional structure M-M of FIG. 7;
FIG. 10 is a schematic view of the overall structure of the connecting rod of the present invention;
FIG. 11 is a schematic cross-sectional view of the structure of section Q-Q of FIG. 10;
FIG. 12 is a schematic view of a link length ratio;
FIG. 13 is a flow diagram of hydraulic oil within the high compression ratio oil gallery of the present invention;
FIG. 14 is a flow diagram of hydraulic oil within the low compression ratio oil gallery of the present invention;
FIG. 15 is a comparison of the effective length of the connecting rod of the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention:
as shown in fig. 1-3: the variable connecting rod for adjusting the compression ratio of the engine by using the rotary valve comprises a rotary valve body 100, a valve sleeve 200 and a connecting rod 300, wherein the rotary valve body 100 is arranged at the bottom end of the valve sleeve 200; the upper end of the valve housing 200 is connected with a connecting rod 300; the top end of the connecting rod 300 is provided with a connecting rod body 301; an eccentric part 302 is arranged in the connecting rod body 301; an oil passage which is communicated with each other is arranged between the connecting rod 300 and the valve sleeve 200; an oil port of the rotary valve body 100 is communicated with an oil passage in the valve housing 200; the rotary valve body 100 rotates within the link body 301; rotating the valve body 100 rotates the eccentric portion 302 by oil through the oil passage.
The first check valve 102 and the second check valve 103 are pressed into the check valve hole in an interference mode, and can also be screwed into the check valve hole in a threaded connection mode; the first check valve 102 and the second check valve 103 are not on the same axial plane, and the included angle between the first check valve 102 and the second check valve 103 is preferably 45-135 degrees; the first check valve 102 and the second check valve 103 are not on the same radial plane, the larger the distance between them, the better, due to the structural limitation, the limitless is impossible, but at least one annular oil passage 104 surrounding the valve core axis should be accommodated between them and have enough sealing length with the edge of the annular oil passage 104.
The annular oil duct 104 is communicated with the first straight oil duct 105, the second straight oil duct 106 and the third straight oil duct 107, and the fourth straight oil duct 108 is located on the outer circular surface of the valve core, is cut inwards and is communicated with each other, so that two-way flow of hydraulic oil is achieved. The first oil passage 105 and the fourth straight oil passage 108 are located on an axial plane where the first check valve 102 is located, and extend in opposite directions to be flush with the edge of the orifice of the check valve from the annular oil passage 104 serving as a starting point on the plane.
The second oil passage 106 and the third oil passage 107 are located on an axial plane where the second check valve 103 is located, and extend in opposite directions on the plane to be flush with the edge of the check valve hole from the annular oil passage 104.
As shown in fig. 3: one side of the first check valve 102 is provided with a gear 101 which can be meshed with other gears or racks 112 so as to rotate the check valve according to the designed angle and direction,
as shown in fig. 4: the rotation of the valve core can also be realized by a deflector rod.
As shown in fig. 5, the first check valve 102 and the second check valve 103 should ensure good sealing of the sealing surface, and open in time when the hydraulic oil pressure reaches the opening set value, so as to ensure the one-way flow and reverse sealing functions of the hydraulic oil.
As shown in fig. 6, the valve sleeve includes a sleeve body 201, a baffle plate 202, a thin baffle plate 205, a through hole 203, a positioning hole 204, a main oil passage 206, a first inclined oil passage 207, and a second inclined oil passage 208. The inner hole 209 of the valve sleeve is matched with the sealing circumferential surface 109 of the valve core, the surface of the valve core is subjected to quenching treatment to ensure the wear resistance, the matching clearance is preferably selected to be between 0.005mm and 0.015mm, the valve core and the valve sleeve are easy to be seized due to too small matching clearance, and the leakage rate of hydraulic oil exceeds a set value due to too large matching clearance.
As shown in fig. 7: in the valve core and valve sleeve assembly, a valve core 100 is inserted from the right axis of a valve sleeve hole 209, a gear end 101 of the valve core is just embedded into an inner hole of a baffle plate 202, in the scheme, the outer diameter of the gear 101 is smaller than the outer diameter of the valve core, the part of the valve core larger than the gear can be blocked by the baffle plate 202 for preventing the valve core from axially falling out from the left side of the valve sleeve, the baffle plate 202 is wider relative to a thin baffle plate 205, and the lower end of the baffle plate is provided with a through hole 203 for placing a rack 111 for. The thin blocking piece 205 is narrow, and an elastic check ring for the hole is preferably selected, and after the valve core is inserted, the valve core is placed into the check ring hole from the right side to prevent the valve core from axially dropping out from the right side of the valve sleeve.
Another scheme for preventing the valve core from being removed from the valve sleeve is shown in fig. 8, an annular groove 210 is formed in the valve core, a screw 211 is screwed into the bottom end of the valve sleeve in a threaded manner, and the front end of the screw 211 is an unthreaded slide rod without threads and is inserted into the annular groove 210, so that the valve core can be prevented from being removed from two sides along the axial direction.
As shown in the cross-sectional views of fig. 9M-M, the positioning device 111 in the valve core presses the positioning steel ball into the positioning hole 204 in the valve sleeve at the two extreme positions of the valve core rotation, thereby stabilizing the valve core at the corresponding positions. When the valve core needs to be switched from one position to another position, the gear rack or the shifting rod pushes the valve core to rotate, the steel ball is compressed inwards by external force to separate from the positioning position, and when the valve core rotates to another position, the spring pushes the steel ball to be pressed into the positioning hole to complete positioning.
As shown in fig. 10, the connecting rod 300 includes a connecting rod body 301, an eccentric portion 302 is disposed in the connecting rod body 301, and an inwardly concave oil cavity is disposed on the circumference of the eccentric portion 302; a limiting piece 303 is arranged in the oil cavity, and the limiting piece 303 divides the oil cavity into a first hydraulic cavity 304 and a second hydraulic cavity 305; one end of a first oil passage 305 in the connecting rod 300 is communicated with a first hydraulic cavity 304, and the other end of the first oil passage 305 is communicated with a second inclined oil passage 208; the other end of the second hydraulic cavity 306 is communicated with the first inclined oil channel 207; the stopper 303 radially coincides with the eccentric portion 302.
The connecting rod 300 is fixedly connected with the valve housing 200 through a bolt 308.
The connecting rod 300 comprises two independent and non-communicated oil ducts which are communicated with the valve core and a round hole at the upper end of the connecting rod, the round hole at the upper end of the connecting rod is provided with a groove for placing a limiting part, and outlets of the two oil ducts at the round hole at the upper end of the connecting rod are respectively positioned at two sides of the groove.
The eccentric part can rotate around the central axis of the excircle in the round hole at the upper end of the connecting rod, the inner hole and the excircle are eccentric, a hydraulic cavity is arranged on the excircle, and oil grooves respectively communicated with two oil ducts in the connecting rod are arranged on two sides of the hydraulic cavity.
The lower part of the limiting part is placed in a groove of a round hole at the upper end of the connecting rod and is in clearance fit with the side wall of the groove; the upper part of the limiting component is placed in a hydraulic cavity of the eccentric component, and the sealing and limiting effects are achieved at the same time; the round hole at the upper end of the connecting rod, the hydraulic cavity of the eccentric part and the limiting part form a first hydraulic cavity 304 and a second hydraulic cavity 305 which are mutually independent, and oil is filled in one hydraulic cavity while oil is drained in the other hydraulic cavity
The eccentric member 302 is rotatable around the center of the outer circle by an external force, and the rotation limit position thereof is determined by the hydraulic pressure chamber in the eccentric member and the stopper member 303. The two independent hydraulic chambers, namely the first hydraulic chamber 304 and the second hydraulic chamber 305, should always maintain good sealing performance.
As shown in section Q-Q of fig. 11: in the working process, the hydraulic cavity of the eccentric component is always in contact with the three planes 311 of the limiting component and generates friction, so that a wear gap can be generated after long-time working, in order to reduce the influence of the wear gap on the sealing performance, the limiting component 303 is always pressed on the eccentric component 302 by adopting two springs 310, in order to ensure uniform pressure, the two springs are distributed on two sides of the first oil passage 306, and the plug 309 with threads is screwed into the hole for placing the spring, so that sufficient pretightening force and support are provided for the spring.
As shown in fig. 12: the invention can realize the controllable change of the effective length of the connecting rod, the original driving force is the resultant force F of the explosion pressure in the cylinder of the engine and the reciprocating inertia force in the cylinder, the resultant force is a vector force, the F always acts on the center of the inner hole of the eccentric component, the direction is positive when the F is downward, the direction is negative when the F is upward, and the F; the effective length h of the connecting rod is the distance from the center of the inner hole of the eccentric part to the center of the circular hole at the lower end of the connecting rod.
The working principle of the invention is as follows: when the compression ratio needs to be increased, namely the engine is switched from a low compression ratio state to a high compression ratio state, the valve core is rotated to the position shown in fig. 13, at the moment, the one-way valve in the valve core is communicated with the first oil passage inclined oil passage 207 of the valve sleeve through 102, and both sides of the second one-way valve 103 are blocked by the valve sleeve and do not work temporarily. Under the action of negative force (-F), the eccentric part tends to rotate clockwise, hydraulic oil enters a straight oil channel four 108 in the valve core from the valve sleeve main oil channel 206 through the annular oil channel on the valve core, the hydraulic oil pushes the one-way valve one 102 to be opened, the hydraulic oil enters a hydraulic cavity two 305 through the inclined oil channel 207 on the valve sleeve and the oil channel two 307 on the connecting rod, and the hydraulic oil flows in a one-way mode and is sealed reversely. Meanwhile, the hydraulic oil in the first hydraulic chamber 304 is squeezed, flows downwards through the first oil passage 306 and the second inclined oil passage 208, flows through the first straight oil passage 105 and the annular oil passage 104 on the valve core, and is collected in the fourth oil passage 108, and pushes the check valve into the second hydraulic chamber 305 together with the hydraulic oil from the main oil passage 206, and at the moment, the internal flow of the hydraulic oil is realized, and the internal flow of the hydraulic oil has the advantage that the internal flow of the hydraulic oil consumes shorter time than the internal flow of the hydraulic chamber filled with the hydraulic oil supplied from the main oil passage alone.
Based on the principle that hydraulic oil can only fill the second hydraulic cavity 305 but cannot flow in the reverse direction in the valve core in the position shown in the figure due to the action of the first check valve 102, under the condition that the oil cavity of the second hydraulic cavity 305 is not filled and the first hydraulic cavity 304 is not emptied in one cycle, negative force (-F) is converted into positive force (+ F), at the moment, the eccentric component has a tendency of rotating counterclockwise, but due to the incompressibility of the liquid and the action of the check valve, the hydraulic oil in the second hydraulic cavity 305 is kept in the hydraulic cavity and bears the pressure caused by the positive force (+ F), so that the eccentric component is stabilized at the current position; during the next working cycle, the positive force (+ F) is converted into the negative force (-F) again, the second hydraulic cavity 305 continues to be filled with oil until the second hydraulic cavity is full, the first hydraulic cavity 304 continues to drain oil until the first hydraulic cavity is completely drained, the limiting component limits the first hydraulic cavity, at the moment, the effective length of the connecting rod is longest, the compression ratio is highest, and the connecting rod assembly can be kept at the position to work stably.
When the compression ratio needs to be reduced, namely the engine is switched from a high compression ratio state to a low compression ratio state, the valve core is rotated to the position shown in fig. 14, at the moment, the second check valve 103 in the valve core is communicated with the inclined oil passage 208 in the valve sleeve, and both sides of the first check valve 102 are blocked by the valve sleeve and do not work temporarily.
Under the action of a positive force (+ F), the eccentric part tends to rotate anticlockwise, hydraulic oil enters a straight oil channel III 106 in the valve core from the valve sleeve main oil channel 206 through the annular oil channel on the valve core, the hydraulic oil pushes the one-way valve III 103 to be opened, the hydraulic oil enters a hydraulic cavity I304 through an inclined oil channel II 208 on the valve sleeve and an oil channel I306 on the connecting rod, and the hydraulic oil flows in a one-way mode and is sealed reversely. Meanwhile, the hydraulic oil in the second hydraulic cavity 305 is squeezed, flows downwards through the third straight oil passage 107 and the annular oil passage 104 on the valve core through the second oil passage 307 and the first inclined oil passage 207, is collected in the first straight oil passage 106, and pushes the check valve into the first hydraulic cavity 304 together with the hydraulic oil from the main oil passage 206, so that the internal bidirectional flow of the hydraulic oil is realized in the two conversion processes.
Based on the principle that hydraulic oil can only fill the first hydraulic cavity 304 with oil and cannot flow in the opposite direction when the first hydraulic cavity 304 is not filled and the second hydraulic cavity 305 is not emptied in one cycle, positive force (+ F) is converted into negative force (-F), the eccentric component has a clockwise rotation trend, but hydraulic oil in the first hydraulic cavity 304 is kept in the hydraulic cavity due to incompressibility of the liquid and the action of the one-way valve and bears pressure caused by the negative force (-F), so that the eccentric component is stabilized at the current position; during the next working cycle, the negative force (-F) is converted into the positive force (+ F) again, the first hydraulic cavity 304 continues to be filled with oil until the first hydraulic cavity is full, the second hydraulic cavity 305 continues to drain oil until the second hydraulic cavity is completely drained, the limiting component limits the first hydraulic cavity, at the moment, the effective length of the connecting rod is shortest, the compression ratio is lowest, and the connecting rod assembly can be kept at the position to work stably.
As shown in fig. 15: the difference value of the effective length of the connecting rod in comparison with the length of the connecting rod in the two states of high compression ratio and low compression ratio is delta h.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A variable connecting rod for adjusting the compression ratio of an engine by using a rotary valve comprises a rotary valve body (100), a valve sleeve (200) and a connecting rod (300), wherein the rotary valve body (100) is arranged at the bottom end of the valve sleeve (200); the upper end of the valve sleeve (200) is connected with a connecting rod (300); the top end of the connecting rod (300) is provided with a connecting rod body (301); an eccentric part (302) is arranged in the connecting rod body (301); an oil passage which is communicated with each other is arranged between the connecting rod (300) and the valve sleeve (200); an oil port of the rotary valve body (100) is communicated with an oil passage in the valve sleeve (200); the rotating valve body (100) drives the oil to rotate through the oil channel driving eccentric part (302); the method is characterized in that: the rotary valve body (100) comprises a valve core, a gear (101), a first check valve (102), a second check valve (103), an annular oil duct (104), a first straight oil duct (105), a second straight oil duct (106), a third straight oil duct (107) and a fourth straight oil duct (108); the valve core is cylindrical; a gear (101) is arranged on one axial end face of the cylindrical valve core; a one-way valve I (102) and a one-way valve II (103) are arranged in the cylindrical valve core; an annular oil duct (104) is arranged on the cylindrical valve core sealing circumferential surface (109); two sides of the annular oil duct (104) are respectively provided with a one-way valve I (102) and a one-way valve II (103); the first check valve (102) and the second check valve (103) radially penetrate through the valve core; the cylindrical valve core sealing circumferential surface (109) is respectively provided with an oil inlet end and an oil outlet end of a one-way valve I (102) and a one-way valve II (103); one end of the straight oil channel I (105) is communicated with the annular oil channel (104), and the other end of the straight oil channel I (105) extends to the check valve I (102) along the axial direction of the valve core in a straight line mode and is flush with the outlet end of the check valve I (102); one end of the straight oil duct II (106) is communicated with the annular oil duct (104), and one end of the straight oil duct II (106) extends to the check valve II (103) along the axial direction of the valve core in a straight line mode and is flush with the outlet end of the check valve II (103); one end of the straight oil duct III (107) is communicated with the annular oil duct (104), and the other end of the straight oil duct III (107) is communicated with the inlet end of the one-way valve II (103); one end of the straight oil passage four (108) is communicated with the annular oil passage (104), and the other end of the straight oil passage four (108) is communicated with the inlet end of the one-way valve one (102).
2. The variable link for adjusting a compression ratio of an engine using a rotary valve according to claim 1, wherein: and an included angle between the first check valve (102) and the second check valve (103) is 45-135 degrees.
3. The variable link for adjusting a compression ratio of an engine using a rotary valve according to claim 1, wherein: the valve sleeve (200) comprises a valve sleeve shell (201), and an inner arc structure is arranged in the valve sleeve shell (201); the lower end of the inner arc structure is provided with a valve sleeve inner hole (209) for placing the rotary valve body (100); a main oil passage (206) is arranged in the inner arc-shaped structure, and a first inclined oil passage (207) and a second inclined oil passage (208) are respectively arranged on two sides of the main oil passage (206); a positioning hole (204) matched with the positioning device (111) in the valve core is arranged in the valve sleeve inner hole (209); the main oil passage (206) is communicated with the annular oil passage (104) in the valve core; the first inclined oil channel (207) is communicated with the outlet end of the first check valve (102); and the second inclined oil passage (208) is communicated with the outlet end of the second check valve (103).
4. A variable connecting rod for adjusting a compression ratio of an engine using a rotary valve according to claim 3, wherein: also comprises a deflector rod (112); a through hole (203) is formed in the valve sleeve inner hole (209), a blocking piece (202) is arranged in the valve sleeve inner hole (209) and is positioned at the gear (101) of the valve core, and the gear (101) is embedded into the blocking piece (202); a thin baffle plate (205) is arranged on the inner wall of the valve sleeve inner hole (209) opposite to the other end of the gear (101); the deflector rod (112) extends from the through hole (203) to a valve sleeve inner hole (209) to be meshed with the gear (101) of the valve core.
5. A variable connecting rod for adjusting a compression ratio of an engine using a rotary valve according to claim 1 or 3, wherein: the connecting rod (300) comprises a connecting rod body (301), an eccentric part (302) is arranged in the connecting rod body (301), and an inwards concave oil cavity is formed in the circumference of the eccentric part (302); a limiting piece (303) is arranged in the oil cavity, and the limiting piece (303) divides the oil cavity into a first hydraulic cavity (304) and a second hydraulic cavity (305);
one end of a first oil passage (306) in the connecting rod (300) is communicated with the first hydraulic cavity (304), and the other end of the first oil passage (306) is communicated with a second inclined oil passage (208); one end of the second oil passage (307) is communicated with the second hydraulic cavity (305), and the other end of the second oil passage (307) is communicated with the first inclined oil passage (207); the stopper (303) is radially aligned with the eccentric portion (302).
6. A variable connecting rod for adjusting a compression ratio of an engine using a rotary valve according to claim 1 or 3, wherein: an annular groove (210) is arranged on the valve core sealing circumferential surface (109); a screw hole is arranged on the valve sleeve shell (201) relative to the annular groove (210), and a screw (211) is screwed into the screw hole.
7. The variable link for adjusting a compression ratio of an engine using a rotary valve according to claim 5, wherein: the limiting piece (303) is convex; the convex surface (311) of the limiting piece (303) is in contact with the inner wall of the oil cavity; a plug (309) is arranged in the connecting rod body (301); a spring (310) is arranged between the plug (309) and the limiting piece (303); the spring (310) presses and keeps the convex surface (311) of the limiting piece (303) in close contact with the inner wall of the oil chamber.
8. A variable connecting rod for adjusting a compression ratio of an engine using a rotary valve according to claim 3, wherein: the positioning device (111) comprises a long hole which is arranged in the valve core along the radial direction; a compression spring is arranged in the long hole; a steel ball is arranged at the hole of the long hole; the compression spring presses the steel ball outwards.
9. A variable connecting rod for adjusting a compression ratio of an engine using a rotary valve according to claim 3, wherein: the valve core is arranged on the other axial end face of the gear (101) and is provided with an angle groove (110).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810151739.0A CN108798890B (en) | 2018-02-14 | 2018-02-14 | Variable connecting rod for adjusting compression ratio of engine by rotary valve |
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| CN201810151739.0A CN108798890B (en) | 2018-02-14 | 2018-02-14 | Variable connecting rod for adjusting compression ratio of engine by rotary valve |
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| CN108798890A CN108798890A (en) | 2018-11-13 |
| CN108798890B true CN108798890B (en) | 2020-11-20 |
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| CN113530693B (en) * | 2020-04-15 | 2022-06-21 | 广州汽车集团股份有限公司 | Control valve, control oil way and variable compression ratio engine |
| DE102020002457A1 (en) * | 2020-04-23 | 2020-06-10 | FEV Group GmbH | Connecting rod of an internal combustion engine for changing a compression ratio |
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| DE102014106715B4 (en) * | 2014-05-13 | 2024-05-16 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Changeover valve and combustion engine |
| CN106460658A (en) * | 2014-05-20 | 2017-02-22 | 博格华纳公司 | Variable compression ratio connecting rod system with rotary actuator |
| DE102016107986A1 (en) * | 2015-11-04 | 2017-05-04 | Hilite Germany Gmbh | Hydraulic valve and connecting rod with a hydraulic valve |
| DE102016117875A1 (en) * | 2016-03-16 | 2017-09-21 | Hilite Germany Gmbh | Connecting rod for an internal combustion engine with variable compression with an eccentric adjustment |
| CN107529584B (en) * | 2017-09-30 | 2019-05-31 | 中国第一汽车股份有限公司 | A kind of variable connecting rod of length |
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