CN116537937A - Variable length connecting rod, engine and vehicle - Google Patents

Abstract

The invention discloses a variable-length connecting rod, an engine and a vehicle, which belong to the technical field of engines, and are used for connecting a piston and a crankshaft of the engine, and comprise a connecting rod body and an eccentric shaft sleeve: one end of the connecting rod body is configured to be connected with the piston and provided with a first connecting hole, and the other end of the connecting rod body is provided with a second connecting hole; the eccentric shaft sleeve is rotatably arranged in the second connecting hole, the eccentric shaft sleeve can rotate around the central axis of the second connecting hole so that the central point of the eccentric shaft sleeve changes, the eccentric shaft sleeve is configured to be connected with the crankshaft, the distance between the central point of the eccentric shaft sleeve and the central point of the first connecting hole is the center distance of the variable-length connecting rod, and the center distance of the variable-length connecting rod can change along with the rotation of the eccentric shaft sleeve. The invention can make the compression ratio of the engine variable, and improve the thermal efficiency of the engine under different working conditions.

Description

Variable length connecting rods, engines and vehicles

technical field

The invention relates to the technical field of engines, in particular to a variable-length connecting rod, an engine and a vehicle.

Background technique

The engine compression ratio is the technical parameter of the engine, which refers to the degree to which the mixed gas of the engine is compressed. The engine compression ratio is the ratio of the total volume of the cylinder before compression to the volume of the cylinder after compression (that is, the volume of the combustion chamber).

Generally speaking, because the volume of the combustion chamber and the working volume of the cylinder are fixed parameters, they have been determined in the design. Therefore, the compression ratio of the engine cannot be changed, so that the engine cannot adopt different compression ratios according to different working conditions, which leads to poor thermal efficiency of the engine power.

Therefore, there is an urgent need for a variable-length connecting rod, engine and vehicle to solve the above-mentioned needs.

Contents of the invention

The purpose of the present invention is to provide a variable-length connecting rod, engine and vehicle to solve the problem that the compression ratio of the engine in the prior art cannot be changed, so that the engine cannot adopt different compression ratios according to different working conditions. This further leads to a technical problem that the thermal efficiency of the engine power is poor.

As above design, the technical solution adopted in the present invention is:

Variable-length connecting rods, used to connect the engine's pistons and crankshaft, include:

A connecting rod body, one end of the connecting rod body is provided with a first connecting hole and the first connecting hole is configured to be connected to the piston, and the other end of the connecting rod body is provided with a second connecting hole;

The eccentric bushing is rotatably arranged in the second connecting hole, the eccentric bushing can rotate around the central axis of the second connecting hole so that the position of the center point of the eccentric bushing changes, and the eccentric bushing The bushing is configured to be connected to the crankshaft, the distance between the center point of the eccentric bushing and the center point of the first connecting hole is the center distance of the variable-length connecting rod, and the variable-length The center distance of the connecting rod can change with the rotation of the eccentric bushing.

As a preferred mode of the above-mentioned variable-length connecting rod, when the inertial force of the engine acts on the variable-length connecting rod, the eccentric bushing can rotate in the first clockwise direction, and can rotate to make the The position where the center distance of the variable length connecting rod is the largest;

When the explosion pressure of the engine acts on the variable length connecting rod, the eccentric sleeve can rotate in the second clockwise direction, and can rotate to a position where the center distance of the variable length connecting rod is the smallest;

The first clockwise direction is opposite to the second clockwise direction.

As a preferred mode of the above-mentioned variable-length connecting rod, the variable-length connecting rod further includes an eccentric bushing rotation limiting mechanism, and the eccentric bushing rotation limiting mechanism includes:

The limiter is movably arranged on the connecting rod body and can move within a set range relative to the connecting rod body;

A limiting connector, one end is hinged to the limiting member, and the other end is hinged to the eccentric bushing, when the eccentric bushing rotates relative to the second connection hole, the limiting connector can drive the limiting connector Bits move.

As a preferred mode of the above-mentioned variable-length connecting rod, an oil chamber with an opening at one end is arranged in the connecting rod body, the stopper is telescopically arranged at the opening end of the oil chamber, and the oil chamber The opening end is provided with a first oil hole, and the end of the oil chamber far away from the first oil hole is provided with a second oil hole. The engine oil inside can enter the oil chamber through the second oil hole so that the limiting member is stable at the extreme extension position; the limiting member is retracted to the limit retraction relative to the oil chamber position, the engine oil in the engine can enter the oil chamber through the first oil hole so that the limiting member is stable at the limit retracted position.

As a preferred mode of the above-mentioned variable-length connecting rod, the connecting rod body is provided with a limiting cavity communicating with the oil cavity, and the limiting member protrudes relative to the oil cavity to the limit. position, the limiting member abuts against the inner wall of the limiting cavity away from the oil cavity.

As a preferred mode of the above-mentioned variable-length connecting rod, a flange is provided at one end of the limiter close to the second oil hole, and the engine oil entering from the first oil hole can exert a direction toward the flange. With the force of the second oil hole, the engine oil entering from the second oil hole can exert a force on the flange toward the first oil hole.

As a preferred mode of the above-mentioned variable-length connecting rod, a protrusion is provided on the bottom surface of the end of the oil chamber away from the first oil hole, and the limiting member is retracted to the limit relative to the oil chamber When in the retracted position, there is a gap between the limiting member and the protrusion, and the second oil hole communicates with the gap.

As a preferred mode of the variable-length connecting rod, the connecting rod body is provided with a first oil passage and a second oil passage, the outlet of the first oil passage communicates with the first oil hole, the The outlet of the second oil passage communicates with the second oil hole, and the engine oil in the engine can selectively enter the first oil passage or the second oil passage.

As a preferred form of the variable-length connecting rod, a reversing valve installation hole is provided in the connecting rod body, and a reversing valve is installed in the reversing valve installation hole, and the engine oil in the engine can pass through the The reversing valve selectively enters the first oil passage or the second oil passage, and the reversing valve enables the oil in the first oil passage and the second oil passage to flow in only one direction;

Under the action of the inertial force, the machine oil in the engine can enter the second oil passage, and the first oil passage is in a cut-off state; under the action of the explosion pressure, the machine oil in the engine can enter the first oil passage Road, the second oil passage is cut off.

As a preferred mode of the above-mentioned variable-length connecting rod, the inner ring surface of the eccentric bushing is provided with an inner ring oil groove, the outer ring surface of the eccentric bushing is provided with an outer ring oil groove, and the inner ring of the eccentric bushing is provided with There is a communication oil groove connecting the inner ring oil groove and the outer ring oil groove, and the engine oil can enter the reversing valve through the inner ring oil groove, the communication oil groove and the outer ring oil groove in sequence.

The engine includes a piston and a crankshaft, the engine also includes the above-mentioned variable-length connecting rod, the piston is connected to the first connecting hole of the variable-length connecting rod, and the crankshaft is fixedly sleeved on the eccentric bushing .

A vehicle, the vehicle including the above-mentioned engine.

Beneficial effects of the present invention:

The variable-length connecting rod proposed by the present invention, because the center distance of the variable-length connecting rod can change with the rotation of the eccentric bushing, that is, the center distance of the variable-length connecting rod can be changed, so that the compression ratio of the engine can be changed . The engine can exert better efficiency in various changing working conditions. In the actual working process, it is necessary to choose the most suitable compression ratio according to the different working conditions of the engine, so that the engine can obtain good thermal efficiency and make the engine economical. and dynamic.

In the engine and the vehicle proposed by the present invention, the piston and the crankshaft of the engine are connected by a variable-length connecting rod, so that the compression ratio of the engine is variable, and the thermal efficiency of the engine is improved under different working conditions. When the engine load is low, a high compression ratio is used to save fuel; when the engine load is heavy, a low compression ratio is used to make the engine take into account both economy and power.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to the content of the embodiment of the present invention and these drawings without any creative effort.

Fig. 1 is a schematic diagram when the center distance of the variable-length connecting rod provided by Embodiment 1 of the present invention is the largest;

Fig. 2 is a schematic diagram when the center distance of the variable-length connecting rod provided by Embodiment 1 of the present invention is minimum;

Fig. 3 is a schematic diagram of another perspective after the valve body is hidden in Fig. 1;

Fig. 4 is a schematic cross-sectional view when the center distance of the variable-length connecting rod provided by Embodiment 1 of the present invention is the largest;

Fig. 5 is the enlarged view of place A in Fig. 4;

Fig. 6 is a schematic diagram when the center distance of the variable-length connecting rod provided by Embodiment 1 of the present invention is the smallest and the limiter is at the limit retracted position;

Fig. 7 is a schematic diagram of another perspective of Fig. 3;

Figure 8 is an enlarged view at B in Figure 7;

Fig. 9 is a schematic diagram of a half-ring structure provided by Embodiment 1 of the present invention;

Fig. 10 is a schematic structural view of the main connecting rod provided by Embodiment 1 of the present invention.

Fig. 11 is a schematic structural view of the eccentric bushing provided by Embodiment 1 of the present invention;

Fig. 12 is a schematic structural view of the reversing valve when the valve shaft is in the first state according to Embodiment 1 of the present invention;

Fig. 13 is a schematic diagram of another perspective of Fig. 12;

Fig. 14 is a schematic diagram of the valve shaft after the valve body is hidden in Fig. 13;

Fig. 15 is a schematic diagram of another viewing angle of the valve shaft in Fig. 14;

Fig. 16 is a schematic cross-sectional view of a certain section of the reversing valve in Fig. 12;

Fig. 17 is a structural schematic diagram of another viewing angle of the valve shaft provided by Embodiment 1 of the present invention

Fig. 18 is a schematic structural view of the reversing valve when the valve shaft is in the second state according to Embodiment 1 of the present invention;

Fig. 19 is a schematic sectional structure diagram one of the reversing valve in Fig. 18;

Fig. 20 is a schematic diagram of the cross-sectional structure of the reversing valve in Fig. 18;

Fig. 21 is a schematic structural view of the valve body provided by Embodiment 1 of the present invention.

In the picture:

1. Connecting rod body; 11. Oil chamber; 111. First oil hole; 112. Second oil hole; 113. Protrusion; 115. Oil chamber seal blockage; 12. Second connecting hole; 13. First oil passage ; 131, the first hollow chamber; 132, the second hollow chamber; 14, the second oil passage; 141, the third hollow chamber; 142, the fourth hollow chamber; 143, the communication hole; 15, the reversing valve installation hole; 16 , the first connecting hole; 17, the main connecting rod; 18, the semi-ring structure; 181, the connecting groove; 19, the limiting cavity;

2. Eccentric shaft sleeve; 21. Inner ring oil groove; 22. Outer ring oil groove; 23. Connected oil groove;

31. Limiting piece; 311. Flange; 312. Rotating pin; 32. Limiting connector;

4. Reversing valve;

41. Valve body; 411. First flow channel; 412. Second flow channel; 4121. Inlet of second flow channel; 4122. Outlet of second flow channel; 4123. First valve ball; 413. Third flow channel; 4131, the third flow channel inlet; 4132, the third flow channel outlet; 4133, the second valve ball; 414, the perforation of the moving limiter; 415, the valve shaft installation cavity; 416, the first groove structure;

42, valve shaft; 421, valve shaft flow channel; 4211, first section; 4212, second section; 4213, third section; 422, movement limit groove; 43, movement limit piece.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all of them.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. Wherein, the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Embodiment one

This embodiment provides a variable-length connecting rod for connecting the piston and the crankshaft of the engine. The center distance of the variable-length connecting rod can be changed. When it is applied to an engine, the piston of the engine, the variable-length connecting rod and the crankshaft of the engine form a crank-connecting rod mechanism, and the piston drives one end of the variable-length connecting rod to act as a crankshaft. Reciprocating motion, the other end of the variable length connecting rod rotates around the rotation center of the crankshaft.

Specifically, referring to FIG. 1 and FIG. 2 , in this embodiment, the variable-length connecting rod includes a connecting rod body 1 and an eccentric bushing 2 .

One end of the connecting rod body 1 is provided with a first connecting hole 16 configured to be connected with the piston, and the other end of the connecting rod body 1 is provided with a second connecting hole 12 .

Specifically, in this embodiment, the diameter of the second connection hole 12 is larger than the diameter of the first connection hole 16 .

The eccentric bushing 2 is rotatably disposed in the second connecting hole 12 , and the eccentric bushing 2 can rotate relatively around the central axis of the second connecting hole 12 so that the position of the center point O2 of the eccentric bushing 2 changes. The distance between the center point O2 of the eccentric bushing 2 and the center point of the first connecting hole 16 is the center distance of the variable length connecting rod.

The center distance of the variable-length connecting rod can change with the rotation of the eccentric bushing 2 .

In this embodiment, since the center distance of the variable-length connecting rod can change with the rotation of the eccentric bushing 2 , that is, the center distance of the variable-length connecting rod is variable, so that the compression ratio of the engine is variable. The engine can exert better efficiency in various changing working conditions. In the actual working process, it is necessary to choose the most suitable compression ratio according to the different working conditions of the engine, so that the engine can obtain good thermal efficiency and make the engine economical. and dynamic.

Specifically, in this embodiment, when the inertial force of the engine acts on the variable length connecting rod, the eccentric bushing 2 can rotate in the first clockwise direction, and can rotate to the position where the center distance of the variable length connecting rod is the largest ;

When the explosion pressure of the engine acts on the variable-length connecting rod, the eccentric bushing 2 can rotate in the second clockwise direction to a position where the center distance of the variable-length connecting rod is the smallest.

The first clockwise direction is opposite to the second clockwise direction.

Specifically, referring to FIG. 1 , point O2 in FIG. 1 represents the center point of the eccentric bushing 2 , and O3 represents the center point of the second connecting hole 12 .

During the actual working process of the engine, the gas in the cylinder of the engine will generate explosive pressure, and the moving parts in the engine will generate inertial force. The action point of the engine's explosion pressure and inertial force on the variable-length connecting rod is the central point O3 of the second connecting hole 12 . The crankshaft is coaxially fixed in the eccentric bushing 2. Under the action of explosive pressure and inertial force, the action point of the crankshaft force on the variable-length connecting rod is the center point O2 of the eccentric bushing 2. The central point O2 of the eccentric bushing 2 changes with the rotation of the eccentric bushing 2, so that the action point of the crankshaft of the engine on the variable-length connecting rod also changes.

In Fig. 1, under the action of the explosion pressure, the force exerted by the variable-length connecting rod on the eccentric bushing 2 is F1, and the acting point is O3; the corresponding force exerted by the crankshaft on the eccentric bushing 2 is F11, and the acting point is O2. Under the joint action of F1 and F11, the eccentric bushing 2 will rotate in the second clockwise direction.

Under the action of inertial force, the force exerted by the variable-length connecting rod on the eccentric bushing 2 is F2, and the action point is O3; the corresponding force exerted by the crankshaft on the eccentric bushing 2 is F21, and the acting point is O2. Under the joint action of F2 and F21, the eccentric bushing 2 will rotate in the first clockwise direction.

In this embodiment, the change of the center distance of the variable-length connecting rod is a passive change. The explosion pressure and inertial force of the engine act on the center point O3 of the outer ring of the eccentric shaft sleeve 2 (the center point of the outer ring of the eccentric shaft sleeve 2 coincides with the center point of the second connecting hole 12), and the The supporting force acts on the center point O2 of the inner hole of the eccentric bushing 2. Since the point O3 and the point O2 are not in the same position, the eccentric bushing will rotate under the action of explosive pressure and inertial force. Under the action of inertial force, the eccentric bushing 2 will rotate clockwise until the center point of the eccentric bushing 2 is at the first position, at this time the center distance of the variable-length connecting rod is the largest; under the action of the burst pressure, the eccentric bushing 2 will rotate clockwise until the center point of the eccentric bushing 2 is at the second position, and the center distance of the variable-length connecting rod is the smallest at this moment.

Specifically, in this embodiment, the first clockwise direction is the counterclockwise direction shown in FIG. 2 . The second clockwise direction is the clockwise direction shown in FIG. 1 .

Preferably, in this embodiment, the maximum eccentricity of the eccentric shaft sleeve 2 is 2 mm, and the maximum difference in wall thickness of the eccentric shaft sleeve 2 is 4 mm.

When the variable-length connecting rod is applied to the engine, the piston and the crankshaft of the engine are connected through the variable-length connecting rod, so that the compression ratio of the engine is variable. When the engine load is low, a high compression ratio is used to save fuel; when the engine load is heavy, a low compression ratio is used to make the engine take into account both economy and power.

Specifically, as shown in Figure 1, the center distance of the variable length connecting rod is the largest at this time, which is L1; point O1 represents the center point of the first connecting hole 16; point O2 represents the eccentricity when the center distance of the variable length connecting rod is maximum Center point of bushing 2.

As shown in Figure 2, the center distance of the variable-length connecting rod is the smallest at this time, which is L2. The O1 point represents the center point of the first connecting hole 16; the O2' point represents the center point of the eccentric bushing 2 when the center distance of the variable length connecting rod is maximum.

Further, in order to limit the rotation angle of the eccentric bushing 2 relative to the second connection hole 12 , referring to FIG. 3 , in this embodiment, the variable-length connecting rod further includes a rotation limiting mechanism of the eccentric bushing.

Specifically, the rotation limiting mechanism of the eccentric bushing includes a limiting member 31 and a limiting connecting member 32 .

The limiter 31 is movably disposed on the connecting rod body 1 , and the limiter 31 can move relative to the connecting rod body 1 within a set range.

One end of the limiting connector 32 is hinged to the limiting member 31 , and the other end is hinged to the eccentric bushing 2 . When the eccentric bushing 2 rotates relative to the second connection hole 12 , the limiting connector 32 can drive the limiting member 31 to move. Due to the limited movement range of the limiting member 31 relative to the connecting rod body 1 , the rotation range of the eccentric bushing 2 relative to the second connecting hole 12 is limited.

Optionally, in this embodiment, the rotation angle of the eccentric shaft sleeve 2 relative to the second connecting hole 12 is 90°-150°; such as 90°, 96°, 135° or 150°. Of course, in other embodiments, the rotation angle of the eccentric bushing 2 relative to the second connection hole 12 can be set according to needs, and there is no excessive limitation here.

One end of the limit connecting piece 32 is hinged with the limit piece 31, and the other end is hinged with the eccentric bushing 2. When the eccentric bushing 2 rotates relative to the second connection hole 12, the limit connecting piece 32 drives the limit piece 31 relative to the connecting rod. The body 1 moves back and forth. Since the moving range of the limiting member 31 relative to the connecting rod body 1 is limited, the central point of the eccentric bushing 2 can be limited to the first position or the second position.

In the first position, the center-to-center distance of the variable-length links is the largest; in the second position, the center-to-center distance of the variable-length links is the smallest.

Specifically, as shown in FIG. 1 , the center point of the eccentric bushing 2 is at the first position, and the center distance of the variable-length connecting rod is the largest. At this time, the limiting member 31 moves to the first limit position relative to the connecting rod body 1; as shown in FIG. As shown in 2, in the second position, the center distance of the variable-length connecting rod is the smallest, and at this time, the limiting member 31 moves to the second extreme position relative to the connecting rod body 1 .

Further, referring to Fig. 4 and Fig. 5, in this embodiment, the connecting rod body 1 is provided with an oil chamber 11 with an opening at one end, and the stopper 31 is telescopically arranged at the opening end of the oil chamber 11, and the opening of the oil chamber 11 A first oil hole 111 is provided at one end of the oil chamber 11 , and a second oil hole 112 is provided at the end of the oil chamber 11 away from the first oil hole 111 .

Further preferably, in this embodiment, referring to FIG. 2 and FIG. 6 , in order to limit the stretching stroke of the limiting member 31 relative to the oil chamber 11 , in this embodiment, the connecting rod body 1 is further provided with a limiting cavity 19 .

Specifically, the connecting rod body 1 is provided with a limiting chamber 19 communicating with the oil chamber 11. When the limiting member 31 extends relative to the oil chamber 11 to the limit extension position, the distance between the limiting member 31 and the limiting chamber 19 is far from the oil. The inner wall surface of the cavity 11 is in contact with each other, so as to limit the extreme extension position of the limiting member 31 .

Referring to FIG. 5 , when the limiting member 31 is extended to the extreme extension position relative to the oil chamber 11 , the engine oil in the engine can enter the oil chamber 11 through the second oil hole 112 so that the limiting member 31 is stable at the extreme extension position. .

The extreme extended position is the first extreme position of the limiting member 31 . When the limiting member 31 is stabilized at the extreme extension position, the center point of the eccentric bushing 2 can be stabilized at the first position, so that the center distance of the variable-length connecting rod is stabilized at the maximum.

Referring to FIG. 6 , when the limiting member 31 is retracted to the limit retraction position relative to the oil chamber 11 , the engine oil in the engine can enter the oil chamber 11 through the first oil hole 111 so that the limiting member 31 is stable at the limit retracting position .

The limit retracted position is the second limit position of the limiting member 31 . When the limiting member 31 is stabilized at the extreme retracted position, the center point of the eccentric bushing 2 can be stabilized at the second position, so that the center distance of the variable-length connecting rod is stabilized at a minimum.

Further, a flange 311 is provided at the end of the limiting member 31 close to the second oil hole 112, and the engine oil entering from the first oil hole 111 can exert a force on the flange 311 toward the second oil hole 112. The engine oil entering the hole 112 can exert a force on the flange 311 toward the first oil hole 111 .

The setting of the flange 311 further ensures that the limiting member 31 can be stabilized at the extreme extension position or the extreme retraction position, thereby ensuring that the center distance of the variable-length connecting rod is kept at a maximum or a minimum.

Further, referring to Fig. 5 and Fig. 6, a protrusion 113 is provided on the bottom surface of the end of the oil chamber 11 away from the first oil hole 111, and when the stopper 31 is retracted to the limit retraction position relative to the oil chamber 11, the stopper There is a gap between 31 and the protrusion 113, and the second oil hole 112 communicates with the gap.

The presence of the gap enables the engine oil entering from the second oil hole 112 to exert a force on the flange 311 toward the first oil hole 111 .

Specifically, the end of the oil chamber 11 away from the first oil hole 111 is provided with an oil chamber sealing plug 115 , and the protrusion 113 is disposed on the oil chamber sealing plug 115 .

Further, referring to Fig. 4-Fig. 6, the connecting rod body 1 is provided with a first oil passage 13 and a second oil passage 14, the outlet of the first oil passage 13 communicates with the first oil hole 111, and the outlet of the second oil passage 14 The outlet communicates with the second oil hole 112 , and the oil in the engine can selectively enter the first oil passage 13 or the second oil passage 14 .

Referring to FIG. 5 , when the stopper 31 is stretched out to the extreme extension position relative to the oil chamber 11 , the engine oil in the engine enters the oil chamber 11 through the second oil passage 14 and the second oil hole 112 sequentially so that the stopper 31 Stabilized in the extreme extended position. That is to say, in the orientation shown in FIG. 5 , the engine oil in the oil chamber 11 exerts an upward force on the limiting member 31 along the axial direction of the limiting member 31 to ensure that the limiting member 31 is stably maintained at the extreme extension position.

Referring to Fig. 6, when the limiting member 31 is retracted to the extreme retraction position relative to the oil chamber 11, the engine oil in the engine enters into the oil chamber 11 through the first oil passage 13 and the first oil hole 111 in sequence so that the limiting member 31 Stabilize in the extreme retracted position. That is, in the orientation shown in FIG. 6 , the engine oil in the oil chamber 11 exerts a downward force on the limiting member 31 along the axial direction of the limiting member 31 to ensure that the limiting member 31 is stably maintained at the limit retracted position. .

Specifically, there is a gap between the outer sidewall of the limiting member 31 and the inner sidewall of the oil chamber 11 , so that when the limiting member 31 is at the limit retracted position, the oil chamber 11 can accommodate oil. The flange 311 is in clearance fit with the oil chamber 11 to guide the movement of the limiting member 31 to ensure that the limiting member 31 can only reciprocate along its own axis. More specifically, in this embodiment, the limiting member 31 is a cylindrical structure.

Specifically, both the first oil passage 13 and the second oil passage 14 are hollow structures disposed in the connecting rod body 1 .

Specifically, when the center distance of the variable-length connecting rod needs to be controlled to be minimum, after the oil in the engine is controlled to enter the first oil passage 13, the oil enters the oil chamber 11 from the first oil hole 111 through the first oil passage 13, The engine oil exerts a force on the flange 311 toward the second oil hole 112 , so that the limiting member 31 is stabilized at a limit retracted position relative to the oil chamber 11 , thereby ensuring that the center point of the eccentric bushing 2 is stably maintained at the second position.

When it is necessary to control the maximum center distance of the variable-length connecting rod, after controlling the oil in the engine to enter the second oil passage 14, the oil enters into the oil chamber 11 from the second oil hole 112 through the second oil passage 14, and the engine oil The edge 311 exerts a force towards the first oil hole 111 , so that the limiting member 31 is stabilized at a limit extension position relative to the oil chamber 11 , so that the center point of the eccentric bushing 2 is stably maintained at the first position.

Preferably, in this embodiment, there are two limiting connectors 32 . One end of the limiting member 31 located outside the oil chamber 11 is rotatably provided with a rotating pin 312. The two ends of the rotating pin 312 are respectively located on both sides of the connecting rod body 1, and the two limiting connectors 32 are also respectively located on the connecting rod body 1. on both sides. One end of the limit connecting piece 32 on the same side is fixedly connected with the end of the rotating pin 312 on this side, and the other end of the limit connecting piece 32 is rotatably connected with the eccentric shaft sleeve 2 . When the eccentric shaft sleeve 2 rotates, the two limit connecting pieces 32 drive the limit piece 31 to move stably.

Specifically, in this embodiment, the connecting rod body 1 includes a main connecting rod 17 and a half-ring structure 18 connected to each other. The first connecting hole 16 is disposed at the end of the main connecting rod 17 away from the half-ring structure 18 ; the second connecting hole 12 is formed at the connection between the main connecting rod 17 and the half-ring structure 18 .

Further, referring to Fig. 1, Fig. 7 and Fig. 8, in this embodiment, a reversing valve installation hole 15 is provided in the connecting rod body 1, and a reversing valve 4 is installed in the reversing valve installation hole 15, and the engine oil in the engine The reversing valve 4 can selectively enter the first oil passage 13 or the second oil passage 14 , and the reversing valve 4 enables the oil in the first oil passage 13 and the second oil passage 14 to flow in only one direction.

Specifically, referring to FIG. 9 and FIG. 10 , the first oil passage 13 includes a first hollow cavity 131 and a second hollow cavity 132 . The first hollow cavity 131 is arranged in the semi-ring structure 18, and one end thereof communicates with the reversing valve installation hole 15; the second hollow cavity 132 is arranged in the main connecting rod 17, and one end thereof communicates with the other end of the first hollow cavity 131, The opening at the other end is the first oil hole 111 .

The second oil passage 14 includes a third hollow cavity 141 and a fourth hollow cavity 142. The third hollow cavity 141 is arranged in the semi-ring structure 18, and one end thereof communicates with the reversing valve installation hole 15; the fourth hollow cavity 142 is arranged in the main In the connecting rod 17 , one end thereof communicates with the other end of the third hollow cavity 141 , and the opening of the other end is the second oil hole 112 .

Specifically, referring to Fig. 4 and Fig. 11, in this embodiment, the inner ring surface of the eccentric bushing 2 is provided with an inner ring oil groove 21, and the outer ring surface of the eccentric bushing 2 is provided with an outer ring oil groove 22. A communicating oil tank 23 connecting the inner ring oil tank 21 and the outer ring oil tank 22 is provided, and engine oil can enter the reversing valve 4 via the inner ring oil tank 21 , the communicating oil tank 23 and the outer ring oil tank 22 in sequence.

The inner ring oil groove 21 and the outer ring oil groove 22 can store engine oil to ensure that the engine oil can continuously enter the reversing valve 4 .

Preferably, several communicating oil grooves 23 are arranged at intervals along the circumference of the eccentric bushing 2 . Exemplarily, in this embodiment, four communicating oil grooves 23 are arranged at intervals along the circumference of the eccentric bushing 2 .

Under the action of inertial force, the engine oil in the engine can enter the second oil passage 14, and the first oil passage 13 is in a cut-off state. Under the action of the explosion pressure, the machine oil in the engine can enter the first oil passage 13, and the second oil passage 14 is in a cut-off state.

It can be understood that in the actual working process, the variable-length connecting rod will be subjected to both inertial force and explosive pressure during the working process. In order to ensure that the eccentric bushing 2 can only rotate under the action of one force and not be affected by another force, in this embodiment, a reversing valve 4 is provided to control the eccentric bushing 2 to be able to rotate only under the force of inertia. Or turn under the action of explosive pressure.

Exemplarily, the initial state of the variable-length connecting rod is shown in FIG. 2 , and at this moment, the center distance of the variable-length connecting rod is the smallest. When it is necessary to control the center distance of the variable-length connecting rod from small to large to the maximum state, the eccentric bushing 2 rotates counterclockwise as shown in Figure 2 under the action of inertial force, and as the eccentric bushing 2 rotates counterclockwise Rotating, the limiting member 31 gradually protrudes relative to the oil chamber 11 .

At this time, the oil in the engine can only enter the second oil passage 14 through the reversing valve 4, and the oil in the engine enters the oil chamber 11 through the second oil passage 14 and the second oil hole 112 in turn, finally making the limit The member 31 is stabilized in the extreme extended position. At this moment, the state of the variable-length connecting rod is shown in Fig. 1 and Fig. 4 .

In the process of controlling the center distance of the variable-length connecting rod from small to large to the maximum state, the eccentric bushing 2 will also be affected by the explosion pressure, but due to the reversing valve 4, the oil in the engine can only enter the first In the second oil passage 14, the first oil passage 13 cannot be entered. That is to say, the first oil passage 13 is in a cut-off state at this time, and the machine oil in the first oil passage 13 can flow out at this moment, but the machine oil from the outside cannot flow into the first oil passage 13 . The engine oil in the oil chamber 11 exerts a force on the stopper 31 extending out of the oil chamber 11, so that the stopper 31 cannot be retracted relative to the oil chamber 11, and finally restricts the reverse rotation of the eccentric bushing 2 under the burst pressure , that is, the rotation of the eccentric shaft sleeve 2 will not be affected by the burst pressure.

At the same time, in the process of controlling the center distance of the variable-length connecting rod from small to large to the maximum state, the oil in the second oil passage 14 can only flow in one direction, thereby avoiding the backflow of the oil in the oil chamber 11, and finally To realize the stable maintenance of the center distance of the variable length connecting rod at the maximum state.

Exemplarily, the initial state of the variable-length connecting rod is shown in FIG. 1 . At this time, the center distance of the variable length connecting rod is the largest. When it is necessary to control the center distance of the variable-length connecting rod from large to small to the minimum state, the eccentric bushing 2 rotates clockwise as shown in FIG. 1 under the action of the burst pressure. As the eccentric shaft sleeve 2 rotates clockwise, the limiting member 31 gradually retracts relative to the oil chamber 11 .

At this time, the oil in the engine can only enter the first oil passage 13 through the reversing valve 4, and the oil in the engine enters the oil chamber 11 through the first oil passage 13 and the first oil hole 111 in turn, finally making the limit Member 31 is stabilized in the extreme retracted position. At this time, the state of the variable-length connecting rod is shown in FIG. 2 , and the state of the limiting member 31 is shown in FIG. 6 .

In the process of controlling the center distance of the variable-length connecting rod from large to small to the minimum state, the eccentric bushing 2 will also be affected by the inertial force, but due to the reversing valve 4, the oil in the engine can only enter the first The first oil passage 13 cannot enter the second oil passage 14, that is, the second oil passage 14 is in a cut-off state. At this time, the oil in the second oil passage 14 can flow out, but the external machine oil cannot flow into the second oil passage 14. Second oil passage 14. The engine oil in the oil chamber 11 exerts a force on the stopper 31 to retract the oil chamber 11, so that the stopper 31 cannot protrude relative to the oil chamber 11, and finally restricts the reverse rotation of the eccentric bushing 2 under the action of inertial force , that is, the rotation of the eccentric bushing 2 will not be affected by the inertial force.

At the same time, in the process of controlling the center distance of the variable-length connecting rod from large to small to minimum, the oil in the first oil passage 13 can only flow in one direction, thereby avoiding the backflow of the oil in the first oil passage 13 , to ensure that the limiting member 31 is stable at the limit retracted position, and finally ensure that the eccentric bushing 2 is stable at the minimum state of the center distance of the variable-length connecting rod.

Further, referring to FIG. 4 , in the actual manufacturing process, in order to realize the communication between the second oil passage 14 and the oil chamber 11 , a communication hole 143 is drilled in the connecting rod body 1 , and one end of the communication hole 143 communicates with the oil chamber 11 . The other end penetrates to the connecting rod body 1 and is sealed by a steel ball, and the communication hole 143 is a part of the second oil passage 14 .

That is to say, taking the perspective shown in FIG. 4 as an example, the left end of the communication hole 143 is blocked by a steel ball, and the right end communicates with the oil chamber 11 .

Specifically, a communication groove 181 communicating with the reversing valve installation hole 15 and the outer ring oil groove 22 is provided in the semi-ring structure 18 .

12-21, in this embodiment, the reversing valve 4 can control the oil of the engine to selectively enter the first oil passage 13 or the second oil passage 14, and the first oil passage 13 and the second oil passage 14 The oil inside can only flow in one direction.

Specifically, referring to FIG. 12 and FIG. 13 , in this embodiment, the reversing valve 4 includes a valve body 41 and a valve shaft 42 .

The valve body 41 is provided with a valve shaft installation cavity 415 , and the outer peripheral surface of the valve body 41 is provided with a first flow channel 411 , a second flow channel 412 and a third flow channel 413 . The first flow channel 411 is used to connect with the input pipeline, the second flow channel 412 is used to connect with the first oil channel 13, the third flow channel 413 is used to connect with the second oil channel 14, the first flow channel 411, the second flow channel The passage 412 and the third flow passage 413 both pass through the side wall of the valve body 41 and extend to the valve shaft installation chamber 415, the second flow passage 412 is provided with a first valve ball 4123, the first valve ball 4123 makes the second flow passage 412 The fluid in the third flow channel 413 can only flow in one direction, and the second valve ball 4133 is arranged in the third flow channel 413, and the second valve ball 4133 makes the fluid in the third flow channel 413 only flow in one direction.

In this embodiment, the first channel 411 is used to communicate with the communication groove 181 . The second flow channel 412 is used to communicate with the first oil channel 13 , and the third flow channel 413 is used to communicate with the second oil channel 14 .

The valve shaft 42 is movably arranged in the valve shaft installation cavity 415 along its own axis, the outer peripheral surface of the valve shaft 42 is provided with a valve shaft flow channel 421, the first flow channel 411 communicates with the valve shaft flow channel 421, and the valve shaft 42 can move along its own axis to switch between the first state and the second state.

In the first state, the valve shaft channel 421 communicates with the first channel 411 and the third channel 413 at the same time, and the fluid passing through the reversing valve 4 can only flow out from the third channel 413 .

In the second state, the valve shaft channel 421 communicates with the first channel 411 and the second channel 412 at the same time, and the fluid passing through the reversing valve 4 can only flow out from the second channel 412 .

When the reversing valve 4 provided in this embodiment is actually used, the reversing valve 4 is installed at the junction of three pipelines, and the three pipelines include the input pipeline and the first outlet connected to the outlet of the input pipeline. an output line and a second output line.

Specifically, in this embodiment, the first output pipeline is the first oil passage 13 . The second output pipeline is the second oil passage 14 . The input pipeline is the communication groove 181 .

Connect the first flow channel 411 with the input pipeline, connect the first oil channel 13 with the second flow channel 412 , and connect the second oil channel 14 with the third flow channel 413 . By controlling the valve shaft 42 to switch between the first state and the second state, the fluid entering the reversing valve 4 can be controlled to flow out from the second flow channel 412 or flow out from the third flow channel 413 . When the fluid flows out from the second flow channel 412 , it can only flow in one direction in the second flow channel 412 . When the fluid flows out from the third flow channel 413 , it can only flow in one direction in the third flow channel 413 .

Referring to FIGS. 1-4 , in this embodiment, the reversing valve 4 is installed in the reversing valve installation hole 15 of the semi-ring structure 18 . The second oil passage 14 communicates with the third flow passage 413 . The first oil passage 13 communicates with the second flow passage 412 .

Engine oil can enter into the reversing valve mounting hole 15 via the inner ring oil groove 21 , the communicating oil groove 23 , the outer ring oil groove 22 and the communicating groove 181 in sequence, and enter the first flow channel 411 .

When the variable-length connecting rod needs to be switched to the state with the largest center distance, the valve shaft 42 is switched to the first state, and the second flow passage 412 is in the cut-off state, so that the first oil passage 13 is also in the cut-off state and enters the reversing valve. 4 oil can enter the oil chamber 11 through the third flow passage 413, the second oil passage 14 and the second oil hole 112, and at the same time, the eccentric bushing 2 rotates to the position of the eccentric bushing 2 under the action of inertia force. The center point is at the first position. During the rotation of the eccentric shaft sleeve 2, the engine oil in the oil chamber 11 limits the stopper 31 to be stably maintained at the extreme extension position, so as to prevent the eccentric shaft sleeve 2 from rotating under the burst pressure.

When the variable-length connecting rod needs to be switched to the minimum center distance state, the valve shaft 42 is switched to the second state, and the third flow passage 413 is in the cut-off state, so that the second oil passage 14 is also in the cut-off state and enters the reversing valve. 4 oil can enter the oil chamber 11 through the second flow channel 412, the first oil channel 13 and the first oil hole 111, and at the same time, the eccentric shaft sleeve 2 rotates to the center of the eccentric shaft sleeve 2 under the action of the explosion pressure. The point is in the second position. During the rotation process of the eccentric shaft sleeve 2, the engine oil in the oil chamber 11 limits the stopper 31 to be stably kept at the limit retracted position, so as to prevent the eccentric shaft sleeve 2 from rotating under the action of inertial force.

Referring to Fig. 4, Fig. 8, Fig. 17 and Fig. 21, in this embodiment, in order to limit the moving distance of the valve shaft 42, the reversing valve 4 further includes a moving limiter 43, and the moving limiter 43 is configured to be fixedly installed at one end In the installation of the reversing valve 4.

The valve shaft 42 is provided with a movement limiting groove 422 , and the valve body 41 is provided with a movement limitation member perforation 414 , and the other end of the movement limitation member 43 passes through the movement limitation member perforation 414 and extends into the movement limitation groove 422 .

In the first state, the movement limiting member 43 abuts against a side wall of the movement limiting groove 422 perpendicular to the axial direction of the valve shaft 42; The other side wall in the axial direction of the valve shaft 42 abuts against it. In this way, the movement limiting groove 422 realizes the limitation of the moving distance on the valve shaft 42 .

Specifically, referring to FIG. 12 and FIG. 13, the inlet of the first flow channel 411 is located on the outer wall of the valve body 41, the outlet of the first flow channel 411 is located on the inner wall of the valve body 41, and the outlet of the first flow channel 411 is always connected with the third flow channel. 413 connected.

Specifically, the two ends of the second flow channel 412 are respectively provided with a second flow channel outlet 4121 and a second flow channel inlet 4122 penetrating to the inner wall of the valve body 41, and the second flow channel inlet 4122 is provided with a second flow channel inlet 4122. A valve ball 4123 , the first valve ball 4123 enables the fluid passing through the second flow channel 412 to only flow from the second flow channel inlet 4122 to the second flow channel outlet 4121 .

Specifically, the cross-sectional area of the second flow channel inlet 4122 increases gradually along the fluid flow direction, so that when the fluid flows forward, there is a gap between the first valve ball 4123 and the second flow channel inlet 4122, ensuring normal flow of fluid. If the fluid tends to flow backwards, the fluid flowing in the reverse direction exerts pressure on the first valve ball 4123 , so that the first valve ball 4123 blocks the second channel inlet 4122 . In this way, the fluid realizing the second flow channel 412 can only flow in the direction from the second flow channel inlet 4122 to the second flow channel outlet 4121 .

Specifically, in the first state, the outlet of the first flow channel 411 communicates with the third flow channel 413 and communicates with the valve shaft flow channel 421 at the same time, the second flow channel outlet 4121 communicates with the valve shaft flow channel 421, and the valve shaft flow channel 421 communicates with the third channel 413 .

In the second state, the outlet of the first flow channel 411 communicates with the third flow channel 413 and simultaneously shuts off the valve shaft flow channel 421, the second flow channel outlet 4121 is blocked by the outer peripheral surface of the valve shaft 42, and the second flow channel flows The inlet 4122 communicates with the valve shaft channel 421 .

Both ends of the third flow channel 413 are provided with a third flow channel inlet 4131 and a third flow channel outlet 4132 penetrating to the inner wall of the valve body 41 , and a second valve ball 4133 is provided at the third flow channel outlet 4132 , the second valve ball 4133 makes the fluid passing through the third flow channel 413 only flow in the direction from the third flow channel inlet 4131 to the third flow channel outlet 4132 .

Specifically, the cross-sectional area of the third flow channel inlet 4132 gradually increases along the fluid flow direction, so that when the fluid flows forward, there is a gap between the second valve ball 4133 and the third flow channel inlet 4132, ensuring normal flow of fluid. If the fluid tends to flow backwards, the fluid flowing in the reverse direction exerts pressure on the second valve ball 4133 , so that the second valve ball 4133 blocks the third channel inlet 4132 . In this way, the fluid realizing the third flow channel 413 can only flow in the direction from the third flow channel inlet 4131 to the third flow channel outlet 4132 .

Specifically, in the first state, the outlet of the first channel 411 communicates with the third channel inlet 4131 and simultaneously communicates with the valve shaft channel 421 , and the third channel outlet 4132 is blocked by the outer peripheral surface of the valve shaft 42 .

In the second state, the outlet of the first flow channel 411 communicates with the third flow channel inlet 4131 and simultaneously blocks the valve shaft flow channel 421 , and the third flow channel outlet 4132 communicates with the valve shaft flow channel 421 .

Specifically, referring to Fig. 12-Fig. 16, in the first state, the fluid entering the first flow channel 411 is divided into two paths; one of them directly enters the third flow path 413 from the third flow path inlet 4131, at this time the first flow path The three-channel outlet 4132 is blocked by the outer peripheral surface of the valve shaft 42, and the third channel 413 can stably supply fluid to the second oil channel 14; the other channel enters the valve shaft channel 421 through the first channel 411, and then passes through the The second flow channel inlet 4122, the second flow channel 412 and the second flow channel outlet 4121 return to the valve shaft flow channel 421 for a reciprocating cycle.

At the same time, in the first state, the fluid flowing back from the first oil passage 13 to the second flow passage 412 can only flow to the valve shaft flow passage 421 through the second flow passage outlet 4121 due to the restriction of the first valve ball 4123 Participate in the fluid supply from the valve shaft flow passage 421 to the third flow passage 413 , so as to participate in the fluid supply to the second oil passage 14 .

In the first state, due to the setting of the second valve ball 4133 in the third flow channel 413, the fluid in the third flow channel 413 can only flow from the third flow channel inlet 4131 to the third flow channel outlet 4132. flow, the outlet 4132 of the third flow passage is blocked by the outer peripheral surface of the valve shaft 42, so as to ensure that the fluid in the second oil passage 14 can only flow in one direction.

Specifically, referring to FIGS. 18-21 , in the second state, the fluid entering the first flow channel 411 directly enters the third flow channel 413 from the third flow channel inlet 4131 , and then passes through the third flow channel outlet 4132 in turn. , the valve shaft flow channel 421 , the second flow channel inlet 4122 , and the second flow channel 412 flows to the position of the second flow channel outlet 4121 , thereby stably providing fluid to the first oil channel 13 .

At the same time, in the second state, the fluid flowing back from the second oil passage 14 to the third flow passage 413 can only flow from the third flow passage outlet 4132 to the valve shaft flow passage 421 due to the setting of the second valve ball 4133 Inside, it participates in the fluid supply from the valve shaft flow passage 421 to the second flow passage 412 , thereby participating in the fluid supply to the first oil passage 13 .

In the second state, due to the setting of the first valve ball 4123 in the second flow channel 412, the fluid in the second flow channel 412 can only flow in the direction from the second flow channel inlet 4122 to the second flow channel outlet 4121 , the outlet 4121 of the second flow passage is blocked by the outer peripheral surface of the valve shaft 42 , so as to ensure that the fluid in the first oil passage 13 can only flow in one direction.

In this embodiment, the valve shaft 42 can move along its own axis so that one of the second flow channel outlet 4121 and the third flow channel outlet 4131 communicates with the valve shaft flow channel 421 , and the other is connected by the outer peripheral surface of the valve shaft 42 . blockage. The flow channel corresponding to the blocked flow channel outlet can stably supply fluid to its corresponding output pipeline.

Specifically, in the present embodiment, the first flow channel 411 is a through structure penetrating through the valve body 41 , and one end of the first flow channel 411 located in the valve shaft installation cavity 415 communicates directly with the third flow channel inlet 4132 .

Specifically, in this embodiment, the second flow channel 412 is an arc-shaped flow channel extending along the circumferential direction of the valve body 41 , and the corresponding central angle of the arc-shaped flow channel is less than 180°. The second flow channel outlet 4121 and the second flow channel inlet 4122 are respectively located at two ends of the arc-shaped flow channel. The first oil passage 13 communicates roughly with the middle of the arc-shaped flow passage.

The third flow channel 413 is arranged on the side of the second flow channel 412 and close to the second flow channel inlet 4122, the third flow channel 413 generally extends along the axis direction of the valve body 41, and the third flow channel inlet 4132 is close to the second flow channel inlet 4122. One end of the third flow channel 413 is provided, the third flow channel outlet 4131 is located approximately in the middle of the third flow channel 413 , and the other end of the third flow channel 413 communicates with the first oil channel 13 .

Specifically, in this embodiment, the valve shaft channel 421 is a groove structure provided on the outer peripheral surface of the valve shaft 42 , including a first segment 4211 , a second segment 4212 and a third segment 4213 which are connected in sequence. The third section 4213 is set corresponding to the outlet 4131 of the third flow channel, and the first section 4211 is set corresponding to the outlet 4121 of the second flow channel.

When the valve shaft 42 is in the first state, the valve shaft 42 moves to the third channel outlet 4131 and the third segment 4213 are misaligned. At this time, the third channel outlet 4131 is blocked by the outer peripheral surface of the valve shaft 42, and A section 4211 communicates with the outlet 4121 of the second channel correspondingly. When the valve shaft 42 is in the second state, the valve shaft 42 moves to the outlet 4131 of the third channel and communicates with the third segment 4213 correspondingly, and the first segment 4211 and the outlet 4121 of the second channel are misaligned. The channel outlet 4121 is closed by the outer peripheral surface of the valve shaft 42 .

Specifically, the inner wall of the valve body 41 is recessed and provided with two groove structures, and the two groove structures are respectively a first groove structure 416 and a second groove structure, and the first groove structure 416 is connected to the second channel inlet. 4122 communicates with the valve shaft channel 421 , and the second groove structure communicates with the first channel 411 and the third channel inlet 4132 .

In the first state and the second state, the first groove structure 416 makes the second flow channel inlet 4122 and the valve shaft flow channel 421 in a communication state, and the second groove structure makes the first flow channel 411 and the third flow channel flow Inlet 4132 is connected.

Referring to Figures 12-16, when the valve shaft 42 is in the first state, the oil flow path in the reversing valve 4 is:

Part of the engine oil that enters the reversing valve 4 through the input pipeline enters between the valve body 41 and the valve shaft 42 through the first flow channel 411 and flows into the valve shaft flow channel 421; the engine oil in the first oil channel 13 also flows back to the second flow channel 412 , the engine oil in the second flow passage 412 flows between the valve body 41 and the valve shaft 42 through the second flow passage outlet 4121 and flows into the valve shaft flow passage 421 . The engine oil flowing into the valve shaft flow channel 421 flows into the third flow channel 413 through the third flow channel inlet 4132 ; the engine oil flowing into the third flow channel 413 flows out through the second oil channel 14 .

Specifically, referring to Fig. 12-Fig. 16, in the first state, the oil flow path of the second channel 412 in the reversing valve 4 is: P10→P11→P12→P13→P14→P15→P16→P17. The oil finally flows from P17 to the second oil gallery 14 .

For example, referring to FIGS. 18-21 , when the valve shaft 42 is in the second state, the oil flow path in the reversing valve 4 is:

Part of the engine oil entering the reversing valve 4 through the input pipeline enters the space between the valve body 41 and the valve shaft 42 through the first flow passage 411 (the space is a second groove structure), and then flows through the third flow passage inlet 4132 to the third flow passage 413, the oil in the second oil passage 14 also flows back to the third flow passage 413, and the oil in the third flow passage 413 flows to the valve body 41 and the valve shaft 42 through the third flow passage outlet 4131 and flow into the valve shaft flow channel 421, the engine oil flowing into the valve shaft flow channel 421 flows from the second flow channel inlet 4122 to the second flow channel 412 through the first groove structure 416, and flows to the second flow channel 412 The engine oil is output through the first oil passage 13 .

Specifically, referring to Fig. 18-Fig. 21, when the valve shaft 42 is in the second state, the oil flow path in the reversing valve 4 is: P21→P22→P23→P24→P25→P26→P27. The oil finally flows from P27 to the first oil gallery 13 .

Embodiment two

This embodiment provides an engine.

The engine includes a piston and a crankshaft, and also includes the variable-length connecting rod of Embodiment 1, the piston is connected with the first connecting hole 16 of the variable-length connecting rod, and the crankshaft is fixedly sleeved on the piston of the eccentric bushing 2 engines, and the variable-length connecting rod. The rod and the crankshaft of the engine form a crank-connecting rod mechanism. One end of the variable-length connecting rod reciprocates under the drive of the piston, and the other end of the variable-length connecting rod rotates around the rotation center of the crankshaft.

The center distance of the variable length connecting rod is variable, so that the compression ratio of the engine is variable. The engine can exert better efficiency in various changing working conditions. In the actual working process, it is necessary to choose the most suitable compression ratio according to the different working conditions of the engine, so that the engine can obtain good thermal efficiency and make the engine economical. and dynamic.

The central point of the eccentric bushing 2 is the action point of the crankshaft of the engine on the variable length connecting rod.

Due to the setting of the eccentric bushing 2, under the action of the engine's inertial force and explosion pressure, the action point of the engine's crankshaft on the variable-length connecting rod is not at the same position. Under the action of inertial force or explosion pressure, the eccentric bushing 2 will occur rotate. Specifically, under the action of inertial force, the eccentric bushing 2 will rotate clockwise until the center point of the eccentric bushing 2 is at the first position, and at this time the center distance of the variable-length connecting rod is the largest; under the action of the burst pressure, The eccentric bushing 2 will rotate clockwise until the center point of the eccentric bushing 2 is at the second position, and at this time the center distance of the variable-length connecting rod is the smallest. The first clock direction is opposite to the second clock direction.

The rotation limiting mechanism of the eccentric shaft sleeve limits the rotation angle of the eccentric shaft sleeve 2 . When the valve shaft 42 of the reversing valve 4 is switched to the first state, the eccentric sleeve 2 can rotate to the maximum center distance of the variable-length connecting rod under the action of inertial force. When the valve shaft 42 of the reversing valve 4 is switched to the second state, the eccentric sleeve 2 can rotate to the minimum center distance of the variable-length connecting rod under the action of the explosion pressure.

Optionally, in this embodiment, the engine is a two-liter engine with a bore of 82mm, the maximum adjustment range of the variable-length connecting rod is 3.4mm, and the variation of the engine compression ratio is 3.1-5.1 compression ratio units.

Embodiment three

This embodiment provides a vehicle, which includes the engine of the second embodiment.

In the vehicle provided by this embodiment, the compression ratio of the engine is variable. The engine can exert better efficiency in various changing working conditions. In the actual working process, it is necessary to choose the most suitable compression ratio according to the different working conditions of the engine, so that the engine can obtain good thermal efficiency and make the engine economical. and dynamic.

The above embodiments only set forth the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. On the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and changes. These changes and changes are all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (12)

1. A variable length connecting rod for connecting a piston and a crankshaft of an engine, comprising:

a connecting rod body (1), wherein a first connecting hole (16) is formed in one end of the connecting rod body (1) and the first connecting hole (16) is configured to be connected with the piston, and a second connecting hole (12) is formed in the other end of the connecting rod body (1);

the eccentric shaft sleeve (2) is rotatably arranged in the second connecting hole (12), the eccentric shaft sleeve (2) can rotate around the central axis of the second connecting hole (12) so that the position of the central point of the eccentric shaft sleeve (2) changes, the eccentric shaft sleeve (2) is configured to be connected with the crankshaft, the distance between the central point of the eccentric shaft sleeve (2) and the central point of the first connecting hole (16) is the center distance of the variable-length connecting rod, and the center distance of the variable-length connecting rod can change along with the rotation of the eccentric shaft sleeve (2).

2. The variable length connecting rod according to claim 1, characterized in that the eccentric bushing (2) is rotatable in a first time needle direction and to a position where the centre distance of the variable length connecting rod is maximized when the inertial force of the engine acts on the variable length connecting rod;

When the explosion pressure of the engine acts on the variable-length connecting rod, the eccentric shaft sleeve (2) can rotate along a second clockwise direction and can rotate to a position for minimizing the center distance of the variable-length connecting rod;

the first hour hand direction is opposite to the second hour hand direction.

3. The variable length connecting rod of claim 2, further comprising an eccentric bushing rotation limiting mechanism, the eccentric bushing rotation limiting mechanism comprising:

a limiting member (31) which is movably provided to the link body (1) and is movable within a set range with respect to the link body (1);

and one end of the limiting connecting piece (32) is hinged with the limiting piece (31), the other end of the limiting connecting piece is hinged with the eccentric shaft sleeve (2), and the eccentric shaft sleeve (2) can drive the limiting piece (31) to move through the limiting connecting piece (32) when rotating relative to the second connecting hole (12).

4. A variable length connecting rod according to claim 3, characterized in that an oil chamber (11) with an opening at one end is arranged in the connecting rod body (1), the limiting piece (31) is telescopically arranged at the opening end of the oil chamber (11), a first oil hole (111) is arranged at the opening end of the oil chamber (11), a second oil hole (112) is arranged at one end, far away from the first oil hole (111), of the oil chamber (11), and when the limiting piece (31) extends to a limit extension position relative to the oil chamber (11), engine oil in an engine can enter the oil chamber (11) through the second oil hole (112) so that the limiting piece (31) is stabilized at the limit extension position; when the limiting piece (31) is retracted to a limit retraction position relative to the oil cavity (11), engine oil in the engine can enter the oil cavity (11) through the first oil hole (111) so that the limiting piece (31) is stabilized at the limit retraction position.

5. The variable length connecting rod according to claim 4, characterized in that a limiting cavity (19) communicated with the oil cavity (11) is arranged in the connecting rod body (1), and when the limiting piece (31) extends to the limit extending position relative to the oil cavity (11), the limiting piece (31) is abutted with the inner wall surface, far away from the oil cavity (11), of the limiting cavity (19).

6. The variable length connecting rod according to claim 4, wherein a flange (311) is provided at an end of the stopper (31) near the second oil hole (112), and oil entering from the first oil hole (111) can apply a force to the flange (311) toward the second oil hole (112), and oil entering from the second oil hole (112) can apply a force to the flange (311) toward the first oil hole (111).

7. The variable length connecting rod according to claim 6, wherein a bottom surface of an end of the oil chamber (11) remote from the first oil hole (111) is provided with a protrusion (113), and when the stopper (31) is retracted to the limit retracted position with respect to the oil chamber (11), a gap exists between the stopper (31) and the protrusion (113), and the second oil hole (112) communicates with the gap.

8. The variable length connecting rod according to claim 5, characterized in that a first oil passage (13) and a second oil passage (14) are provided in the connecting rod body (1), an outlet of the first oil passage (13) is communicated with the first oil hole (111), an outlet of the second oil passage (14) is communicated with the second oil hole (112), and engine oil in the engine can selectively enter the first oil passage (13) or the second oil passage (14).

9. The variable length connecting rod according to claim 8, characterized in that a reversing valve mounting hole (15) is provided in the connecting rod body (1), a reversing valve (4) is mounted in the reversing valve mounting hole (15), engine oil in the engine can selectively enter the first oil passage (13) or the second oil passage (14) via the reversing valve (4), and the reversing valve (4) enables engine oil in the first oil passage (13) and the second oil passage (14) to flow only in one direction;

under the action of the inertia force, engine oil in the engine can enter the second oil duct (14), and the first oil duct (13) is in a cut-off state; under the explosion pressure, engine oil in the engine can enter the first oil passage (13), and the second oil passage (14) is in a cut-off state.

10. The variable length connecting rod according to claim 9, characterized in that an inner ring oil groove (21) is provided on the inner ring surface of the eccentric sleeve (2), an outer ring oil groove (22) is provided on the outer ring surface of the eccentric sleeve (2), a communication oil groove (23) which communicates the inner ring oil groove (21) and the outer ring oil groove (22) is provided in the eccentric sleeve (2), and engine oil of the engine can enter the reversing valve (4) sequentially through the inner ring oil groove (21), the communication oil groove (23) and the outer ring oil groove (22).

11. Engine comprising a piston and a crankshaft, characterized in that the engine further comprises a variable length connecting rod according to any one of claims 1-10, the piston being connected to a first connecting hole (16) of the variable length connecting rod, the crankshaft being fixedly journalled in the eccentric sleeve (2).

12. A vehicle, characterized in that it comprises an engine according to claim 11.