CN114060148B - Variable length connecting rod, engine and connecting rod length control method - Google Patents

Variable length connecting rod, engine and connecting rod length control method Download PDF

Info

Publication number
CN114060148B
CN114060148B CN202010773896.2A CN202010773896A CN114060148B CN 114060148 B CN114060148 B CN 114060148B CN 202010773896 A CN202010773896 A CN 202010773896A CN 114060148 B CN114060148 B CN 114060148B
Authority
CN
China
Prior art keywords
connecting rod
rod body
engine
push
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010773896.2A
Other languages
Chinese (zh)
Other versions
CN114060148A (en
Inventor
马卫平
曹永伟
胡洪涛
魏云腾
李艳利
王红丹
任亚南
李鹏飞
王�琦
王子川
张安鑫
冯贝贝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Great Wall Motor Co Ltd
Original Assignee
Great Wall Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Great Wall Motor Co Ltd filed Critical Great Wall Motor Co Ltd
Priority to CN202010773896.2A priority Critical patent/CN114060148B/en
Publication of CN114060148A publication Critical patent/CN114060148A/en
Application granted granted Critical
Publication of CN114060148B publication Critical patent/CN114060148B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/06—Adjustable connecting-rods

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention has provided a length variable tie rod and engine and tie rod length control method with this tie rod, the tie rod of the invention includes the first tie rod body, second tie rod body and locking mechanism, one end of the first tie rod body and one end of the second tie rod body are inserted and connected slidably, and is restrained in the second tie rod body, and slide relatively between second tie rod body and the first tie rod body, can form the flexible change of the tie rod length, and because the second tie rod body is to the spacing of the inserted end of the first tie rod body, the first tie rod body has the extension bit in the state of stretching out relative to the second tie rod body, and is in the contraction bit of the state of contracting relative to the second tie rod body; the locking mechanism is arranged on the second connecting rod body, is provided with a locking end, responds to an external control signal, and acts to lock the first connecting rod body at the extending position or the contracting position through the locking end. The connecting rod of the invention can realize the change of the length of the connecting rod, and the realization form of the connecting rod is simple in structure, thereby having good practicability.

Description

Variable length connecting rod, engine and connecting rod length control method
Technical Field
The invention relates to the technical field of engine compression ratio adjustment, in particular to a connecting rod with adjustable length. The invention also relates to an engine with the connecting rod and a control method of the length of the connecting rod.
Background
The compression ratio of an automobile engine is a main parameter influencing the oil consumption, power and heat efficiency of the engine, generally, under the same regulation, the higher the heat efficiency of the engine, the lower the oil consumption and the stronger the power performance, however, the high compression ratio also brings the disadvantage of engine knocking. Meanwhile, under different engine speeds, the corresponding detonation critical compression ratio values are different, and generally the higher the engine speed is, the lower the corresponding critical value is, and the existing engine compression ratio is generally fixed, so that the lowest value can be obtained only in the engine working speed range, which undoubtedly greatly affects the performance of the engine.
In order to overcome the defect that the compression ratio of an engine is fixed and not changed, a variable compression ratio technology is developed, and one of the current ways of changing the compression ratio of the engine is to change the center distance of a connecting rod of the engine, namely, change the length of the connecting rod. However, the existing link length changing modes mostly adjust the structural length of the link through a hydraulic device or increase an operating mechanism to adjust the length of the link, and the length adjusting modes have the defects of complex structure, low reliability and the like.
Disclosure of Invention
In view of the above, the present invention is directed to a length-variable connecting rod, so as to adjust the length of the connecting rod and simplify the length adjustment structure.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a variable length connecting rod comprising:
the first connecting rod body is provided with an extending position which is in an extending state relative to the second connecting rod body and a contracting position which is in a contracting state relative to the second connecting rod body;
and the locking mechanism is arranged on the second connecting rod body, is provided with a locking end, responds to an external control signal, and acts to lock the first connecting rod body at the extending position or the contracting position through the locking end.
Furthermore, relative to the end connected with each other in an inserting manner, hinge holes are respectively formed in the other ends of the first connecting rod body and the second connecting rod body.
Furthermore, an insertion cavity is arranged on the second connecting rod body, the insertion end of the first connecting rod body is located in the insertion cavity, one end of the insertion cavity penetrates through the end portion of the second connecting rod body to form the sliding arrangement of the first connecting rod body in the second connecting rod body, an opening penetrating through the first connecting rod body to the outside of the second connecting rod body is arranged on one side of the insertion cavity, a boss extending into the opening is arranged on one side of the insertion end of the first connecting rod body, and the boss follows the first connecting rod body and can slide in the opening.
Furthermore, a sunk groove is formed in the second connecting rod body, one end of the sunk groove penetrates through the end part of the second connecting rod body, one side of the sunk groove is provided with the opening, a cover plate for sealing the sunk groove is fixedly connected to the second connecting rod body, and the inserting cavity is formed by the covered sunk groove.
Furthermore, the locking mechanism comprises a push-pull electromagnetic valve which is fixedly arranged on the second connecting rod body corresponding to the opening, the locking end is formed by a telescopic valve rod of the push-pull electromagnetic valve, and the first connecting rod body is locked due to the clamping of the extended valve rod on the insertion end of the first connecting rod body.
Furthermore, the two push-pull electromagnetic valves are arranged at intervals and comprise an extending position push-pull electromagnetic valve and a contracting position push-pull electromagnetic valve which are respectively arranged corresponding to the extending position and the contracting position of the first connecting rod body, the valve rod of the extending position push-pull electromagnetic valve is longer than that of the contracting position push-pull electromagnetic valve, the first connecting rod body is locked at the extending position due to the fact that the valve rod of the extending position push-pull electromagnetic valve is clamped at the end part of the inserting end, and the first connecting rod body is locked at the contracting position due to the fact that the valve rod of the contracting position push-pull electromagnetic valve is clamped at one side of the boss.
Furthermore, the end part of the insertion end of the first connecting rod body is provided with a convex extension section, and the valve rod of the extension position push-pull electromagnetic valve is clamped at the end part of the extension section to lock the first connecting rod body at the extension position.
Compared with the prior art, the invention has the following advantages:
the connecting rod of the invention can realize the extension and contraction of the first connecting rod body relative to the second connecting rod body through the locking mechanism for respectively locking the first connecting rod body at the extension position and the contraction position, thereby realizing the length change of the whole connecting rod.
The invention also provides an engine, a connecting rod with variable length is arranged between a piston and a crankshaft of the engine, and the external control signal is from a controller of the engine.
In addition, the present invention also provides a method for controlling the length of the connecting rod, which is used for controlling the length of the connecting rod, and the method comprises:
when the controller detects an engine knock signal, the first connecting rod body is locked at the contraction position, and when the controller detects no engine knock signal, the first connecting rod body is locked at the extension position.
Further, when the controller detects an engine knock signal, firstly, the first link body is unlocked from the extending position in the intake stroke of the engine, and the first link body is locked in the contracting position in the compression, work-doing or exhaust stroke of the engine;
when the controller detects that no engine knocks, firstly, the locking of the first connecting rod body at the contraction position is released in the compression, work or exhaust stroke of the engine, and the first connecting rod body is locked at the extension position in the air inlet stroke of the engine
The connecting rod length control method can shorten the length of the connecting rod when the engine knocks, is beneficial to eliminating the knocks, and can extend the length of the connecting rod when the engine does not knock, so as to be beneficial to improving the running performance of the engine.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a connecting rod according to a first embodiment of the present invention;
FIG. 2 is an exploded view of a linkage structure according to one embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first link according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second link body according to a first embodiment of the invention (without a cover plate);
FIG. 5 is a schematic structural view of an extended position solenoid push-pull valve according to a first embodiment of the present invention;
FIG. 6 is a schematic structural view of a retracted position solenoid valve according to a first embodiment of the present invention;
FIG. 7 is a schematic view illustrating the first link body being locked in the extended position according to the first embodiment of the present invention;
FIG. 8 is a schematic view of the first link body locked in the retracted position according to the first embodiment of the present invention;
description of reference numerals:
1-a first connecting rod body, 2-a second connecting rod body, 3-an extension position push-pull electromagnetic valve, 4-a contraction position push-pull electromagnetic valve and 5-a cover plate;
101-a first link head, 102-a first link rod, 103-a first link hinge hole, 104-an extension, 105-a boss, 106-an end abutment surface, 107-a boss abutment surface;
201-a second connecting rod head part, 202-a second connecting rod part, 203-a second connecting rod hinge hole, 204-a stop block, 205-a sink groove, 2051-a through hole, 2052-an opening, 206-an end limiting surface, 207-a boss limiting surface and 208-a fixing hole;
301-extending a valve stem, 302-extending a valve fixing bolt;
401-shrink valve stem, 402-shrink valve fixing bolt;
501-set screw.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The present embodiment relates to a length-variable connecting rod, which is generally used in an automobile engine and used for a transmission connection between a piston and a crankshaft in the engine, and the connecting rod of the present embodiment can change its length according to an operating condition of the engine, particularly, an engine knocking condition by setting the length thereof to be adjustable, thereby enabling the length of the connecting rod to be shortened when knocking occurs to help eliminate the knocking, and enabling the length of the connecting rod to be lengthened when knocking does not occur to help improve the engine operating performance.
In the overall structure design, the connecting rod of this embodiment includes the first connecting rod body, the second connecting rod body and locking mechanism. One end of the first connecting rod body is connected with one end of the second connecting rod body in a sliding insertion mode, is restrained in the second connecting rod body, and can form telescopic change of the length of the connecting rod along with relative sliding between the first connecting rod body and the second connecting rod body.
Meanwhile, based on the sliding of the first connecting rod body in the second connecting rod body and the fact that the inserting end of the first connecting rod body is constrained in the second connecting rod body, the first connecting rod body is enabled to have an extending position in an extending state relative to the second connecting rod body and a contracting position in a contracting state relative to the second connecting rod body due to the limitation of the second connecting rod body on the inserting end of the first connecting rod body.
In addition, the locking mechanism is disposed on the second link body, and the locking mechanism has a locking end, and in response to an external control signal, the locking mechanism operates to lock the first link body in the extended position or the retracted position by the locking end.
This embodiment utilizes first connecting rod body can be in respectively for the second connecting rod body and stretches out position and shrink position according to above whole setting, finally utilizes locking mechanism to first connecting rod body in stretching out the position and locking respectively of shrink position, alright realize the flexible of the continuous first connecting rod body of pegging graft for the second connecting rod body to can realize the holistic length change of connecting rod.
At this time, based on the above design concept, an exemplary structure of the length-adjustable connecting rod of the present embodiment is as shown in fig. 1 and fig. 2, and wherein the insertion end of the first connecting rod 1, that is, the end indicated by the reference symbol a of the first connecting rod 1 in fig. 2, is inserted into the second connecting rod 2.
In addition, as shown in fig. 3, a schematic structural diagram of the first link body 1 of the present embodiment is shown, and a main structure of the first link body is composed of a first link head 101 and a first link rod portion 102 fixedly connected to the first link head 101. A first link hinge hole 103 is formed at the first link head 101, and the first link hinge hole 103 is generally used to be hingedly connected to a piston in an engine to realize connection between the link and the piston.
In this embodiment, a boss 105 is disposed at the insertion end of the first link body 1, the boss 105 protrudes outward toward the first link body 1, and after the connecting rod is assembled, the boss 105 is disposed in an opening 2052 in the second link body 2. In addition to the projection 105, a protruding extension 104 is also formed at the end of the plug end of the first link body 1, and the end of the extension 104 then also forms the end of the plug end of the first link body 1.
As shown in fig. 4, a specific structure of the second connecting rod body 2 of the present embodiment is similar to that of the first connecting rod body 1, and in terms of a main structure, the second connecting rod body 2 is also composed of a second connecting rod head 201 and a second connecting rod portion 202 fixedly connected to the second connecting rod head 201, and a second connecting rod hinge hole 203 is also formed at the second connecting rod head 201 for hinge connection between the integral connecting rod and the crankshaft in the engine.
In this embodiment, in order to realize the insertion of the insertion end of the first connection rod 1 in the second connection rod 2, specifically, an insertion cavity is disposed on the second connection rod 2, and the insertion end of the first connection rod 1 is located in the insertion cavity. At this time, as a molding manner of the above insertion cavity, in this embodiment, the second link body 2 is provided with a sinking groove 205, one end of the sinking groove 205 penetrates through to the end of the second link body 2 to form a through opening 2051 for the first link body 1 to slide in the second link body 2, one side of the sinking groove 205 also has the opening 2052 penetrating through to the outside of the second link body 2, and the opening 2052 is specifically formed by integrally molding the stopper 204 on the second link rod portion 202 and clamping the second link rod portion 202 together.
In addition to the sinking groove 205, the second link body 2 of the present embodiment further has a cover plate 5 attached thereto for covering the sinking groove 205, and the cover plate 5 can be generally fixed to each fixing hole 208 of the second link body 2 by a plurality of fixing screws 501. Thus, the insertion cavity can be formed by the cover of the cover plate 5, i.e. by the covered recess 205.
In this embodiment, the through hole 2051 of the second link body 2 also realizes the sliding setting of the constrained first link body 1 relative to the second link body 2, and the boss 105 of the first link body 1 is located in the opening 2052, so that the boss 105 can follow the first link body 1 and slide in the opening 2052. At this time, along with the sliding of the second link body 1, when the end abutting surface 106 of the insertion end of the first link body 1 contacts the end limiting surface 206 in the second link body 2, the first link body 1 can be limited, and the first link body 1 is located at the contraction position retracted into the second link body 2. When the boss abutting surface 107 on the boss 105 of the first link body 1 contacts the boss limiting surface 207 in the second link body 2, the first link body 1 can be limited, and the first link body 1 is located at the extending position extending from the second link body 2.
In this embodiment, the above sinking groove 205 and the corresponding cover plate 5 for capping are used to jointly realize the molding of the insertion cavity in the second connecting rod body 2, and the embodiment has the characteristics of simpler structure and being beneficial to assembly. It should be noted, however, that besides the inserting cavity formed by the sinking groove 205 and the cover plate 5, other structural forms may be adopted in this embodiment to achieve the constraint arrangement of the inserting end of the first link body 1 in the second link body 2 and also achieve the sliding arrangement between the first link body 1 and the second link body 2.
In other molding forms of the insertion cavity, for example, the second link rod portion 202 may be formed in two halves, and each half structure is provided with a sunken groove 205, and then the insertion end of the first link body 1 is placed in the sunken groove 205 of one half structure, and then the other half structure is fastened and fixed. It should be noted that, since the two half structures are both provided with the sinking grooves 205, the sinking grooves 205 on each half structure need to be provided with a smaller groove depth, and in order to ensure the connection strength of the second connecting rod portion 202 and the second connecting rod head portion 201, after the two half structures are fastened, in addition to the fixed connection between the two half structures, the movable half structure and the second connecting rod head portion 201 can also be fixedly connected.
In this embodiment, as a preferable implementation form, the locking mechanism specifically includes a push-pull electromagnetic valve fixed on the second link body 2 corresponding to the opening 2052. At this time, the locking end is also formed by a telescopic valve rod of the push-pull electromagnetic valve, and the first connecting rod body 1 can be locked due to the clamping of the extended valve rod to the inserting end of the first connecting rod body 1.
When the push-pull solenoid valve is adopted, as a further exemplary arrangement form, as shown in fig. 1 or fig. 2, the push-pull solenoid valve of the present embodiment may be provided as two push-pull solenoid valves arranged at intervals, and specifically includes an extended position push-pull solenoid valve 3 and a retracted position push-pull solenoid valve 4 which are respectively provided corresponding to the extended position and the retracted position of the first link body 1.
The solenoid push-pull valve of this embodiment may be formed by conventional components, and the structure of the extended position solenoid push-pull valve 3 may be as shown in fig. 5, where the valve rod is specifically an extended valve rod 301, and the extended position solenoid push-pull valve 3 may also be fixed on the second connecting rod 2 by a plurality of extended valve fixing bolts 302. The contracting position push-pull solenoid valve 4 is constructed substantially as shown in fig. 6 in the same structure as the extending position push-pull solenoid valve 3, and also has a contracting valve stem 401, and is fixed by a plurality of contracting valve fixing bolts 402, and the contracting position push-pull solenoid valve 4 is different from the extending position push-pull solenoid valve 3 only in that the stem of the extending position push-pull solenoid valve 3 is longer than the contracting position push-pull solenoid valve 4.
In the embodiment, referring to fig. 7, with the above arrangement of the extending position push-pull solenoid valve 3, when the first link body 1 is located at the extending position due to sliding, the extending valve rod 301 of the extending position push-pull solenoid valve 3 is clamped at the end abutting surface 106 of the end of the first link body 1, so as to lock the first link body 1 at the extending position. Referring to fig. 8 again, when the first link body 1 is located at the contraction position due to sliding, the contraction valve rod 401 of the contraction position push-pull solenoid valve 4 is clamped at the boss abutting surface 107 on one side of the boss 105, so that the first link body 1 can be locked at the contraction position.
Therefore, the valve rods in the extension position push-pull electromagnetic valve 3 and the contraction position push-pull electromagnetic valve 4 are respectively clamped, so that the first connecting rod body 1 can be respectively locked in the extension position and the contraction position, the first connecting rod body 1 is positioned in the extension state or the retraction state relative to the second connecting rod body 2, and the change of the whole length of the connecting rod formed by the two connecting rod bodies is finally realized.
However, two push-pull solenoid valves are provided to lock the first link body 1 in the extended position and the retracted position by respective operations of valve stems of the two push-pull solenoid valves. Of course, it is also feasible to configure the push-pull solenoid valve as one fixed to the second link body 2, but at this time, the plugging end of the first link body 1 needs to be adjusted adaptively. For example, one side of the insertion end of the first link body 1 may be provided with a slot corresponding to the extending position and the contracting position, and the locking of the first link body 1 is also realized by using the locking of the valve rod of only one push-pull solenoid valve in different slots.
The connecting rod of this embodiment passes through locking mechanism to first connecting rod body 1 in the locking respectively of stretching out position and shrink position, can realize the flexible of the first connecting rod body 1 for second connecting rod body 2 that links to each other of pegging graft, can realize the holistic length change of connecting rod from this. And because only link to each other through the grafting of two connecting rod bodies to and make the grafting end of first connecting rod body 1 restrict in the second connecting rod body 2, and utilize locking mechanism to lock first connecting rod body 1, it also makes this connecting rod length adjustment structure compare in current hydraulic pressure regulation or add modes such as operating device, and is simpler structurally, and then can make the length adjustment structure obtain simplifying, and also can improve the reliability of adjusting the structure.
Example two
The present embodiment relates to an engine, in which a variable-length connecting rod in the first embodiment is disposed between a piston and a crankshaft, and the external control signal in the first embodiment is generally from a controller (i.e., an engine ECU) of the engine.
The connecting rod with the variable length is adopted in the embodiment, the length of the connecting rod can be shortened when the engine knocks, so that knocking can be eliminated, and the length of the connecting rod can be extended when the engine does not knock, so that the running performance of the engine can be improved.
At this time, the specific control of the length of the link of the present embodiment to achieve the above-described effects includes the following methods:
a. when the controller detects an engine knock signal, the first connecting rod body 1 is locked at a contraction position;
b. when the controller detects that no engine knock signal exists, the first connecting rod body 1 is locked at the extending position.
When the controller detects an engine knock signal, the embodiment specifically releases the lock of the first link body 1 in the extended position, that is, retracts the extended valve stem 301, when the link rod is not pressed during the intake stroke of the engine under the control of the controller. Then, in the compression, work or exhaust stroke of the engine, the connecting rod is pressed, the contraction valve rod 401 is not stressed, and the contraction valve rod 401 extends out to lock the first connecting rod body 1 at the contraction position.
When the controller detects that there is no engine knock signal, similar to the above when there is a knock signal, the controller also uses the pressure of the connecting rod when the engine is in compression, work or exhaust stroke, the contracting valve rod 401 is not stressed, and the contracting valve rod 401 is retracted, so as to release the locking of the first connecting rod 1 in the contracting position. Then, in the intake stroke of the engine, the connecting rod is pulled to stretch out the valve rod 301 without being stressed, so that the stretched valve rod 301 stretches out, and the first connecting rod body 1 is locked at the stretching position.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. A variable length connecting rod, comprising:
the connecting rod comprises a first connecting rod body (1) and a second connecting rod body (2), wherein one end of the first connecting rod body (1) is connected with one end of the second connecting rod body (2) in a sliding and inserting mode, constrained in the second connecting rod body (2), and capable of forming telescopic change of the length of the connecting rod along with relative sliding between the first connecting rod body (1) and the second connecting rod body (2), and the first connecting rod body (1) is provided with an extending position in an extending state relative to the second connecting rod body (2) and a contracting position in a contracting state relative to the second connecting rod body (2) due to the limitation of the second connecting rod body (2) on the inserting end of the first connecting rod body (1);
the locking mechanism is arranged on the second connecting rod body (2), is provided with a locking end and responds to an external control signal, and the locking mechanism acts to lock the first connecting rod body (1) at the extending position or the contracting position through the locking end;
an inserting cavity is arranged on the second connecting rod body (2), an inserting end of the first connecting rod body (1) is located in the inserting cavity, one end of the inserting cavity penetrates through the end part of the second connecting rod body (2) to form sliding arrangement of the first connecting rod body (1) in the second connecting rod body (2), an opening (2052) penetrating outside the second connecting rod body (2) is formed in one side of the inserting cavity, a boss (105) extending into the opening (2052) is arranged in one side of the inserting end of the first connecting rod body (1), and the boss (105) follows the first connecting rod body (1) and can slide in the opening (2052);
a sunken groove (205) is formed in the second connecting rod body (2), one end of the sunken groove (205) penetrates through the end of the second connecting rod body (2), one side of the sunken groove (205) is provided with the opening (2052), a cover plate (5) for sealing the sunken groove (205) is fixedly connected to the second connecting rod body (2), and the inserting cavity is formed by the sealed sunken groove (205);
the locking mechanism comprises a push-pull electromagnetic valve which is fixedly arranged on the second connecting rod body (2) corresponding to the opening (2052), the locking end is formed by a telescopic valve rod of the push-pull electromagnetic valve, and the first connecting rod body (1) is locked due to the clamping of the extended valve rod on the inserting end of the first connecting rod body (1).
2. A variable length connecting rod according to claim 1, wherein: and relative to the end connected with each other in an inserting way, hinge holes are respectively arranged at the other ends of the first connecting rod body (1) and the second connecting rod body (2).
3. A variable length connecting rod according to claim 1, wherein: the two push-pull electromagnetic valves are arranged at intervals and comprise an extension position push-pull electromagnetic valve (3) and a contraction position push-pull electromagnetic valve (4) which are respectively arranged corresponding to the extension position and the contraction position of the first connecting rod body (1), the valve rod of the extension position push-pull electromagnetic valve (3) is longer than the contraction position push-pull electromagnetic valve (4), the first connecting rod body (1) is locked at the extension position due to the fact that the valve rod of the extension position push-pull electromagnetic valve (3) is clamped at the end part of the insertion end, and the first connecting rod body (1) is locked at the contraction position due to the fact that the valve rod of the contraction position push-pull electromagnetic valve (4) is clamped at one side of the boss (105).
4. A variable length connecting rod according to claim 3, wherein: the end part of the inserting end of the first connecting rod body (1) is provided with a convex extension section (104), and the valve rod of the extension position push-pull electromagnetic valve (3) is clamped at the end part of the extension section (104) to lock the first connecting rod body (1) at the extension position.
5. An engine, characterized in that: a variable length connecting rod according to any one of claims 1 to 4 provided between a piston and a crankshaft of the engine, and the external control signal is from a controller of the engine.
6. A method of controlling the length of a connecting rod according to claim 5, characterized in that: the control method comprises the following steps:
when the controller detects an engine knock signal, the first connecting rod body (1) is locked at the contraction position, and when the controller detects no engine knock signal, the first connecting rod body (1) is locked at the extension position.
7. The method of controlling a length of a connecting rod according to claim 6, characterized in that:
when the controller detects an engine knock signal, firstly, the first connecting rod body (1) is unlocked at the extending position in the air inlet stroke of the engine, and the first connecting rod body (1) is locked at the contracting position in the compression, work doing or exhaust stroke of the engine;
when the controller detects that no engine knock signal exists, firstly, the first connecting rod body (1) is unlocked at the contraction position in the compression, work or exhaust stroke of the engine, and the first connecting rod body (1) is locked at the extension position in the intake stroke of the engine.
CN202010773896.2A 2020-08-04 2020-08-04 Variable length connecting rod, engine and connecting rod length control method Active CN114060148B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010773896.2A CN114060148B (en) 2020-08-04 2020-08-04 Variable length connecting rod, engine and connecting rod length control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010773896.2A CN114060148B (en) 2020-08-04 2020-08-04 Variable length connecting rod, engine and connecting rod length control method

Publications (2)

Publication Number Publication Date
CN114060148A CN114060148A (en) 2022-02-18
CN114060148B true CN114060148B (en) 2023-01-31

Family

ID=80231948

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010773896.2A Active CN114060148B (en) 2020-08-04 2020-08-04 Variable length connecting rod, engine and connecting rod length control method

Country Status (1)

Country Link
CN (1) CN114060148B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203670436U (en) * 2013-11-29 2014-06-25 长城汽车股份有限公司 Variable length connecting rod for engine
WO2018188790A1 (en) * 2017-04-10 2018-10-18 Iwis Motorsysteme Gmbh & Co. Kg Valve mechanism for a longitudinally adjustable connecting rod
CN110645088A (en) * 2018-06-26 2020-01-03 现代自动车株式会社 Variable compression ratio engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203670436U (en) * 2013-11-29 2014-06-25 长城汽车股份有限公司 Variable length connecting rod for engine
WO2018188790A1 (en) * 2017-04-10 2018-10-18 Iwis Motorsysteme Gmbh & Co. Kg Valve mechanism for a longitudinally adjustable connecting rod
CN110645088A (en) * 2018-06-26 2020-01-03 现代自动车株式会社 Variable compression ratio engine

Also Published As

Publication number Publication date
CN114060148A (en) 2022-02-18

Similar Documents

Publication Publication Date Title
EP2975230B1 (en) Lost motion valve actuation systems with locking elements including wedge locking elements
US7028647B2 (en) Variable compression ratio connecting rod for internal combustion engine
US20140326212A1 (en) Lost Motion Valve Actuation Systems with Locking Elements Including Wedge Locking Elements
KR101683446B1 (en) Apparatus and system comprising collapsing and extending mechanisms for actuating engine valves
US11168622B2 (en) Switch valve and piston rod with switch valve
KR20150024936A (en) Length-adjustable con rod
JP2005511940A (en) Method and system for improving engine braking by variable valve drive
CN101787989A (en) Multi-level piston two-way hydraulic cylinder
CN103603975A (en) Check valve with push rod and multi-stage hydraulic cylinder
CN114060148B (en) Variable length connecting rod, engine and connecting rod length control method
US6412453B1 (en) System and method for varying the compression ratio of an internal combustion engine
CN106837592B (en) Double-screw transmission type variable compression ratio piston
CN106051185B (en) A kind of balanced valve built in pooling feature
CN110582625A (en) Length-adjustable connecting rod for piston engine
WO2022048072A1 (en) High-efficiency multi-stage brake mechanism
US10801402B2 (en) Connecting rod for an internal combustion engine with variable compression
US6408804B1 (en) Apparatus for varying the compression ratio of an internal combustion engine
CN111059096A (en) Hydraulic centering locking actuating cylinder structure
CN214788319U (en) Multi-chamber hydraulic cylinder with bidirectional buffering function
CN114876911A (en) Three-stage synchronous telescopic hydraulic oil cylinder
US10443490B1 (en) Variable compression ratio engine
CN208935053U (en) Check valve assembly for Double Acting Telescopic Hydraulic Cylinder
CN210461813U (en) Internal control type control valve structure
GB2443690A (en) Retractable cam system for an 8-stroke and 4-stroke cycle change engine
CN207715456U (en) A kind of high reliability buffering throttling oil cylinder connection valve block assembly

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant