CN115217640A - Compression ratio switching device, variable compression ratio engine and automobile - Google Patents
Compression ratio switching device, variable compression ratio engine and automobile Download PDFInfo
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- CN115217640A CN115217640A CN202210197062.0A CN202210197062A CN115217640A CN 115217640 A CN115217640 A CN 115217640A CN 202210197062 A CN202210197062 A CN 202210197062A CN 115217640 A CN115217640 A CN 115217640A
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- China
- Prior art keywords
- compression ratio
- rod
- actuating rod
- ratio switching
- variable compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
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- 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
Abstract
The application belongs to the technical field of engines, concretely relates to compression ratio auto-change over device, variable compression ratio engine and car, compression ratio auto-change over device includes: the variable compression ratio engine comprises an execution rod, a mounting seat and a driver, wherein a shifting fork is arranged on the execution rod, the opening of the shifting fork faces to a change-over switch, the mounting seat is used for being connected with a cylinder body of the variable compression ratio engine in an assembling mode, the execution rod is slidably mounted on the mounting seat, the driver is in transmission connection with the execution rod and drives the execution rod to slide axially, so that the shifting fork can shift the change-over switch to adjust the working length of a driving connecting rod. The driver toggles the change-over switch through the shifting fork of the execution rod, the resistance of the change-over switch is small, the driver does not need to continuously work after switching to maintain the axial position of the execution rod, the requirement on the driver is low, and therefore the manufacturing cost of the driver can be reduced.
Description
Technical Field
The application belongs to the technical field of engines, and particularly relates to a compression ratio switching device, a variable compression ratio engine and an automobile.
Background
The compression ratio of the engine is the ratio of the working volume of the cylinder to the volume of the combustion chamber, and can be changed by changing the piston stroke or the volume of the compression space. Fig. 1 is a schematic structural view of a conventional compression ratio switching device for changing a piston stroke, and as shown in fig. 1, the compression ratio switching device includes a lower link 24 rotatably attached to a crank pin 23, an upper link 25 connecting the lower link 24 and a piston 3, a control shaft 27 provided with an eccentric shaft portion 28, and a control link 26 connecting the eccentric shaft portion 28 and the lower link 24. One end of the upper link 25 is rotatably connected to the piston 3 via a piston pin 30, and the other end of the upper link 25 is rotatably connected to the lower link 24 via a first connecting pin 31; one end of the control link 26 is rotatably connected to the lower link 24 via a second connecting pin 32, and the other end of the control link 26 is rotatably attached to the eccentric shaft portion 28. The rotational position of the control shaft 27 is changed by a motor, and the posture of the lower link 24 by the control link 26 is changed, so that the top dead center position and the bottom dead center position of the piston 3 are changed in accordance with the piston motion of the piston 3. Maintaining the rotational position of the control shaft 27, the motor needs to be continuously operated and is subjected to a large force, resulting in high manufacturing costs of the motor.
Disclosure of Invention
The application aims to provide a compression ratio switching device, a variable compression ratio engine and an automobile, so that the working state of a motor is improved, the manufacturing cost of the motor is reduced, and the manufacturing cost is high.
In order to achieve the above object, the present application provides a compression ratio switching apparatus for a variable compression ratio engine including a drive link on which a switch for adjusting a working length of the drive link is provided, the compression ratio switching apparatus comprising:
the actuating rod is provided with a shifting fork, and an opening of the shifting fork faces to the selector switch;
the mounting seat is used for being assembled and connected with a cylinder body of the variable compression ratio engine, and the actuating rod is slidably mounted on the mounting seat;
and the driver is in transmission connection with the execution rod and drives the execution rod to slide along the axial direction of the execution rod, so that the shifting fork can shift the change-over switch and adjust the working length of the driving connecting rod.
Optionally, the driver includes a motor and a driving actuator, and the motor drives the actuating rod to slide along the axial direction of the actuating rod through the driving actuator.
Optionally, driver actuating actuator includes the connecting axle and dials the round pin, connecting axle one end is provided with stirs the groove, the connecting axle other end with motor be connected, dial round pin one end with actuating lever be connected, dial round pin one end setting and be in stir the inslot, dial the round pin with the connecting axle is parallel and the interval sets up, the motor drives the connecting axle rotates, the connecting axle passes through stir the groove and stir the round pin drives the actuating lever is followed the endwise slip of actuating lever.
Optionally, the compression ratio switching device further includes a limiting block, the limiting block is assembled with the actuating rod, the limiting block has limiting teeth arranged at intervals, and part of the structure of the variable compression ratio engine is located between the two limiting teeth.
Optionally, the limiting block and the actuating rod are positioned by a positioning pin and connected by a threaded fastener.
Optionally, the mounting seat includes an upper support and a lower support that are connected, a mounting cavity is formed between the upper support and the lower support, the actuating rod is located in the mounting cavity, and the upper support is assembled and connected with the cylinder body.
Optionally, the compression ratio switching device further includes a rotation stopping pin, a sliding groove extending axially along the actuating rod is disposed on the upper support, one end of the rotation stopping pin is assembled and connected with the actuating rod, and the other end of the rotation stopping pin is located in the sliding groove.
Optionally, a plurality of shifting forks are arranged at intervals along the axial direction of the actuating rod.
The present application further provides a variable compression ratio engine comprising:
a cylinder body;
the compression ratio switching device is assembled and connected with the cylinder body;
the driving connecting rod is arranged on the cylinder body through a crankshaft, a change-over switch used for adjusting the working length of the driving connecting rod is arranged on the driving connecting rod, the change-over switch is close to the compression ratio change-over device in the rotation process of the crankshaft, and the compression ratio change-over device is shifted through a shifting fork.
The present application further provides an automobile comprising:
a variable compression ratio engine;
a wheel;
and a transmission mechanism connecting the wheels and the variable compression ratio engine.
The application discloses compression ratio auto-change over device, variable compression ratio engine and car have following beneficial effect:
in the application, the actuating rod is installed on a cylinder body of the variable compression ratio engine through the installation seat, the driver drives the actuating rod to slide along the axial direction of the actuating rod, the shifting fork can shift the change-over switch, the working length of the driving connecting rod is adjusted, namely the distance from the piston to the crankshaft is adjusted, and therefore the compression ratio of the variable compression ratio engine can be adjusted. The driver toggles the change-over switch through the shifting fork of the execution rod, the resistance of the change-over switch is small, the driver does not need to continuously work after switching to maintain the axial position of the execution rod, the requirement on the driver is low, and therefore the manufacturing cost of the driver can be reduced.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural view of a conventional compression ratio switching device that changes a piston stroke.
Fig. 2 is a schematic structural diagram of a compression ratio switching device in the embodiment of the present application.
Fig. 3 is a schematic structural view of the variable compression ratio engine in the embodiment of the present application.
Fig. 4 is a schematic structural diagram of a driver in the embodiment of the present application.
Fig. 5 is a three-dimensional schematic view of the compression ratio switching apparatus in the embodiment of the present application.
FIG. 6 is a schematic view of a connection structure of a limiting block and an actuating rod in the embodiment of the present application.
FIG. 7 is a schematic cross-sectional view of an actuator rod in the position of a mounting block in an embodiment of the present application.
Fig. 8 is a schematic structural view of a drive link in the embodiment of the present application.
Description of reference numerals:
100. a compression ratio switching device;
110. an actuating lever; 111. a shifting fork;
120. a mounting seat; 121. an upper support; 122. a lower support; 123. a second screw;
130. a driver; 131. a motor; 132. a connecting shaft; 1321. a poking groove; 133. a toggle pin;
140. a limiting block; 141. a limit tooth; 142. a first screw; 143. positioning pins;
150. a rotation stopping pin;
200. a cylinder body;
300. a crankshaft;
400. a drive link; 401. a changeover switch; 402. a connecting rod body; 403. a crankshaft bore; 404. a first piston rod; 405. a second piston rod; 406. an eccentric bushing; 407. a rocker arm stand; 408. a first piston chamber; 409. a second piston chamber; 410. an oil inlet groove; 411. a first oil passage; 412. a second oil passage;
500. a piston.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the embodiments of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The present application will be described in further detail with reference to the following drawings and specific examples. It should be noted that the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
Fig. 2 is a schematic structural view of a compression ratio switching apparatus in the embodiment of the present application, fig. 3 is a schematic structural view of a variable compression ratio engine in the embodiment of the present application, and referring to fig. 2 and 3, a compression ratio switching apparatus 100 is used for the variable compression ratio engine. The variable compression ratio engine includes a driving link 400, and a change-over switch 401 for adjusting the working length of the driving link 400 is provided on the driving link 400. The driving connecting rod 400 is mounted to the cylinder block 200 through the crankshaft 300, the piston 500 is further mounted to the driving connecting rod 400, and the distance from the piston 500 to the crankshaft 300, that is, the working length of the driving connecting rod 400, is adjusted by toggling the switch 401, so that the compression ratio of the variable compression ratio engine can be adjusted.
Referring to fig. 2, the compression ratio switching apparatus 100 includes an actuating lever 110, a mount 120, and a driver 130. The actuating rod 110 comprises a rod body and a shifting fork 111 arranged on the rod body, the shifting fork 111 is of a U-shaped structure, and the shifting fork 111 is used for shifting the switch 401 along the axial direction of the actuating rod 110, so that the opening of the shifting fork 111 faces the switch 401. The mount 120 is used for fitting connection with a cylinder block 200 of a variable compression ratio engine, and the actuator rod 110 is slidably mounted on the mount 120. The driver 130 is in transmission connection with the actuating rod 110 and drives the actuating rod 110 to slide along the axial direction of the actuating rod 110, so that the shifting fork 111 can shift the selector switch 401 to adjust the working length of the driving link 400.
It should be noted that the shift fork 111 is used for shifting the switch 401, and the specific shape and structure thereof can be configured according to the shape and structure of the switch 401. The fork 111 and the body of the actuating rod 110 may be coupled by fitting, but not limited thereto, and the fork 111 and the body of the actuating rod 110 may be integrally formed. The driver 130 is used to be in transmission connection with the actuating rod 110, and the transmission connection between the two can be direct connection or indirect connection. The actuator 130 is used for driving the actuator rod 110 to slide along the axial direction of the actuator rod 110, and the actuator 130 may be mounted on the cylinder 200 or the like, as the case may be.
In the present application, the actuating rod 110 is mounted to the cylinder 200 of the variable compression ratio engine through the mounting seat 120, and the actuator 130 drives the actuating rod 110 to slide along the axial direction of the actuating rod 110, so that the shift fork 111 can shift the switch 401, and the working length of the driving connecting rod 400, that is, the distance from the piston 500 to the crankshaft 300, is adjusted, thereby adjusting the compression ratio of the variable compression ratio engine. The driver 130 pushes the switch 401 through the shifting fork 111 of the actuator rod 110, the switch 401 has small switch resistance, the driver 130 does not need to work continuously after switching to maintain the axial position of the actuator rod 110, the requirement on the driver 130 is low, and therefore the manufacturing cost of the driver 130 can be reduced.
Referring to fig. 2, in some embodiments, a plurality of shift forks 111 are provided at intervals in the axial direction of the actuating rod 110, that is, the variable compression ratio engine is a multi-cylinder engine. A crankshaft 300 of the variable compression ratio engine is provided with a plurality of driving connecting rods 400, and each driving connecting rod 400 is provided with a corresponding piston 500.
It should be noted that, a plurality of compression ratio switching devices 100 may be installed in the variable compression ratio engine, the number of the shift forks 111 and the number of the driving links 400 in a single compression ratio switching device 100 do not need to correspond one to one, and in the variable compression ratio engine, the total number of the shift forks 111 and the total number of the driving links 400 may correspond one to one.
A plurality of spaced-apart forks 111 are provided along the axial direction of the actuating rod 110, that is, the forks 111 may be provided according to the number of the driving links 400 of the variable compression ratio engine, which may be a single-cylinder engine or a multi-cylinder engine, and the application range of the compression ratio switching apparatus 100 is wider.
For example, fig. 4 is a schematic structural diagram of a driver in an embodiment of the present application, and referring to fig. 4, the driver 130 may include a motor 131 and a driving actuator, and the motor 131 drives the actuator 110 to slide along an axial direction of the actuator 110 through the driving actuator.
It should be noted that the driver 130 may include a motor 131 and a driving actuator, but is not limited thereto, and the driver 130 may further include an electromagnet, a return spring, and the like, and the electromagnet magnetically attracts the actuating rod 110, so that the actuating rod 110 can slide along the axial direction of the actuating rod 110, and the return spring can return the actuating rod 110 to its initial position, and the specific structure of the driver 130 may be determined as the case may be.
The driver 130 can comprise a motor 131 and a driving actuator, the motor 131 is used as a power source to drive the actuating rod 110 to slide along the axial direction of the actuating rod 110, the motor 131 can be a low-power stepping motor, the low-power stepping motor is small in size and low in manufacturing cost, and the manufacturing cost of the engine can be reduced when the motor is used for a variable compression ratio engine.
Specifically, as shown in fig. 4, the driving actuator includes a connecting shaft 132 and a toggle pin 133, one end of the connecting shaft 132 is provided with a toggle slot 1321, and the other end of the connecting shaft 132 is connected to the motor 131 in an assembling manner; one end of the toggle pin 133 is assembled with the actuating bar 110, and the other end of the toggle pin 133 is disposed in the toggle slot 1321. The toggle slot 1321 may be a straight slot, and the toggle slot 1321 passes through the axial direction of the connecting shaft 132. The toggle pin 133 and the connecting shaft 132 are parallel and spaced, that is, the toggle pin 133 and the toggle pin 133 are located in the toggle slot 1321 at a position offset from the axis of the connecting shaft 132. The motor 131 drives the connecting shaft 132 to rotate, the connecting shaft 132 drives the toggle pin 133 through the toggle slot 1321, and then the actuating rod 110 is driven to slide along the axial direction of the actuating rod 110, and finally the shift fork 111 is used for toggling the change-over switch 401, so as to adjust the compression ratio of the variable compression ratio engine.
It should be noted that the toggle pin 133 can be assembled and connected with the actuating rod 110, but is not limited thereto, and the toggle pin 133 can also be integrally formed with the actuating rod 110, as the case may be. The toggle slot 1321 may be disposed on the connecting shaft 132, and the connecting shaft 132 is connected to the output shaft of the motor 131, but is not limited thereto, and the toggle slot 1321 may also be directly disposed on the output shaft of the motor 131 as the case may be.
The output shaft of connecting axle 132 and motor 131 is connected, stir groove 1321 sets up the one end at the connecting axle 132, stir round pin 133 sets up in stirring groove 1321, the connecting axle 132 stirs stir round pin 133 through stirring groove 1321, and then drive actuating lever 110 along the axial slip of actuating lever 110, thereby convert the rotation of motor 131 into the axial slip of actuating lever 110, the axially sliding stroke accessible of actuating lever 110 stirs round pin 133 and the distance of connecting axle 132 and adjusts, thereby can guarantee that the position of shift fork 111 is suitable, shift fork 111 can dial change over switch 401 in place and do not interfere with drive connecting rod 400.
Fig. 5 is a three-dimensional schematic view of the compression ratio switching device in the embodiment of the present application, and referring to fig. 5, the compression ratio switching device 100 further includes a limiting block 140, and the limiting block 140 is assembled and connected with the actuating rod 110. The limiting block 140 has two limiting teeth 141 spaced apart from each other, and a part of the variable compression ratio engine is located between the two limiting teeth 141, for example, a rib of the cylinder block 200 is located between the two limiting teeth 141.
It should be noted that the limiting block 140 may include two limiting teeth 141, but is not limited thereto, and the limiting block 140 may also have only one limiting tooth 141, and the limiting tooth 141 is inserted into the recessed structure of the cylinder body 200, which may be determined as the case may be.
The limiting block 140 has two limiting teeth 141 arranged at intervals, a part of the structure of the variable compression ratio engine is located between the two limiting teeth 141, and the limiting block 140 can limit the stroke of the execution rod 110 sliding along the axial direction of the execution rod 110, so that the proper position of the shifting fork 111 can be ensured, that is, the shifting fork 111 can shift the change-over switch 401 in place and does not interfere with the driving connecting rod 400.
Fig. 6 is a schematic view of a connection structure of a limiting block and an actuating rod in the embodiment of the present application, and referring to fig. 6, the limiting block 140 and the actuating rod 110 are connected by a fastener, and the fastener includes a first screw 142. In addition, two positioning pins 143 are disposed between the limiting block 140 and the actuating rod 110, and the limiting block 140 and the actuating rod 110 are precisely positioned by the positioning pins 143.
It should be noted that the position between the limiting block 140 and the actuating rod 110 can be fixed by two positioning pins 143, but is not limited thereto, and the limiting block 140 and the actuating rod 110 can also be integrally connected, as the case may be.
The limit block 140 is connected with the actuating rod 110 through a fastener, the fastener cannot be accurately positioned when being connected, the limit block 140 is positioned with the actuating rod 110 through two positioning pins 143, and when the limit block 140 is assembled on the actuating rod 110, the installation position is more accurate, and the stroke of the actuating rod 110 sliding along the axial direction of the actuating rod 110 is also more accurate.
Referring to fig. 5, in some embodiments, the mounting base 120 includes an upper support 121 and a lower support 122, and the upper support 121 and the lower support 122 are connected by a fastener, and the fastener includes a second screw 123. The upper support 121 and the lower support 122 form a mounting cavity therebetween, and the actuating rod 110 is located in the mounting cavity.
It should be noted that the mounting seat 120 includes an upper seat 121 and a lower seat 122, a mounting cavity is formed between the upper seat 121 and the lower seat 122, and the actuating rod 110 is located in the mounting cavity, but the invention is not limited thereto, and the mounting seat 120 may also be an integral body and be sleeved on the actuating rod 110, as the case may be.
The mounting seat 120 is divided into an upper seat 121 and a lower seat 122, so that the actuating rod 110 is more conveniently mounted, and the rod body of the actuating rod 110 and the shifting fork 111 can be designed as a whole.
The upper support 121 is assembled with the cylinder 200, and may be connected by a fastener. In addition, a positioning pin 143 may be provided between the upper seat 121 and the cylinder 200, so that the mounting position of the mounting seat 120 to the cylinder 200 is more accurate. The plurality of shifting forks 111 are arranged on the actuating rod 110 at intervals, the mounting seat 120 is positioned between two adjacent shifting forks 111, so that the mounting position of the mounting seat 120 on the cylinder body 200 is ensured to be more accurate, and the mounting seat 120 not only can support the actuating rod 110, but also can play a role in limiting the stroke of the actuating rod 110 sliding along the axial direction of the actuating rod.
When a plurality of forks 111 are spaced apart from each other on the actuating rod 110, that is, when the actuating rod 110 has a large length, a plurality of mounting seats 120 may be provided to support the actuating rod 110, so that the actuating rod 110 is more stable.
Fig. 7 is a schematic sectional view of the actuating rod at the position of the mounting seat in the embodiment of the present application, and referring to fig. 7, the portion of the actuating rod 110 clamped to the mounting seat 120 is a cylindrical portion. The compression ratio switching device 100 further comprises a rotation stopping pin 150, a sliding groove extending along the axial direction of the actuating rod 110 is formed in the upper support 121, one end of the rotation stopping pin 150 is assembled and connected with the actuating rod 110, and the other end of the rotation stopping pin 150 is located in the sliding groove.
It should be noted that the rotation stopping pin 150 may be disposed on the actuating rod 110, but is not limited thereto, and the rotation stopping pin 150 may also be disposed on the upper support 121 or the lower support 122, as the case may be. In addition, the portion of the actuating rod 110 clamped to the mounting seat 120 may also be square, and the mounting cavity of the mounting seat 120 may also be square accordingly, so that the rotation stop pin 150 and the sliding groove may be omitted, as the case may be.
The rotation stop pin 150 is provided between the mounting seat 120 and the actuating rod 110 to prevent the actuating rod 110 from rotating in the circumferential direction thereof, which causes the opening of the shift fork 111 to deviate from the direction of the switch 401.
The present application also provides a variable compression ratio engine, as shown in fig. 2, which includes a compression ratio switching device 100, a cylinder block 200, a crankshaft 300, a driving connecting rod 400, and a piston 500. Compression ratio switching device 100 is attached to cylinder block 200, drive link 400 is attached to cylinder block 200 via crankshaft 300, and drive link 400 is further attached to piston 500. During the rotation of the crankshaft 300, the switch 401 on the driving connecting rod 400 is close to the compression ratio switching device 100, and the compression ratio switching device 100 toggles the switch 401 through the shifting fork 111 to adjust the working length of the driving connecting rod 400, i.e. to adjust the distance from the piston 500 to the crankshaft 300, so that the compression ratio of the variable compression ratio engine can be adjusted.
For example, fig. 8 is a schematic structural diagram of a driving link in an embodiment of the present application, and referring to fig. 8, the driving link 400 includes a switch 401, a link body 402, a rocker arm, a first piston rod 404, and a second piston rod 405. The rocker arm comprises an eccentric bushing 406 and a rocker arm bracket 407, the eccentric bushing 406 is rotatably connected to one end of the connecting rod body 402 where the piston 500 is installed, the rocker arm bracket 407 is fixedly connected to the outer wall of the eccentric bushing 406, the rocker arm bracket 407 has a first side and a second side opposite to each other, the connecting rod body 402 has a first piston cavity 408 and a second piston cavity 409, one end of a first piston rod 404 is hinged to the first side of the rocker arm bracket 407, the other end of the first piston rod 404 is arranged in the first piston cavity 408, one end of a second piston rod 405 is hinged to the second side of the rocker arm bracket 407, and the other end of the second piston rod 405 is arranged in the second piston cavity 409.
The connecting rod body 402 has an oil inlet groove 410 inside a crankshaft hole 403 for mounting the crankshaft 300, and the oil inlet groove 410 is communicated with a mounting hole of the change-over switch 401. The connecting rod body 402 is further internally provided with a first oil passage 411 and a second oil passage 412, the shifting fork 111 axially shifts the change-over switch 401 along the actuating rod 110 to a first position, the oil inlet groove 410, the mounting hole of the change-over switch 401 and the first oil passage 411 are communicated, the shifting fork 111 axially shifts the change-over switch 401 along the actuating rod 110 to a second position, and the oil inlet groove 410, the mounting hole of the change-over switch 401 and the second oil passage 412 are communicated. Since the inner hole of the eccentric bush 406 is an eccentric structure, when the oil pressure ejects the first piston rod 404 and the second piston rod 405, the distance between the inner hole of the eccentric bush 406 and the crank hole 403 is different. That is, adjusting the distance between the inner bore of the eccentric bushing 406 and the crank hole 403 can adjust the distance of the piston 500 from the crankshaft 300, thereby making the compression ratio of the variable compression ratio engine adjustable.
Too high a compression ratio may result in too high an in-cylinder mixture pressure at high load of the engine, producing knocking, which may cause serious damage to the engine. In order to prevent knocking, the engine with the turbocharger has a compression ratio lower than that of a naturally aspirated engine and is fixed, and when the supercharging pressure is low, the compression ratio is lower, engine combustion is insufficient, and accordingly thermal efficiency and fuel economy are reduced. These characteristics determine the compression ratio of a general engine as a compromise considering various influencing factors, and thus the potential of the engine cannot be fully exerted. The compression ratio of the variable compression ratio engine can be adjusted, so that the engine can keep a proper compression ratio in each working condition, and the reliability and the performance of the engine are greatly improved.
In the present application, the variable compression ratio engine toggles the switch 401 of the driving connecting rod 400 through the compression ratio switching device 100, and adjusts the distance from the piston 500 to the crankshaft 300, so that the compression ratio of the variable compression ratio engine can be adjusted. The actuator 130 in the compression ratio switching device 100 pushes the switch 401 through the shifting fork 111 of the actuating rod 110, the switch 401 has small switch resistance, the actuator 130 does not need to work continuously after switching to maintain the axial position of the actuating rod 110, the requirement on the actuator 130 is low, and therefore the manufacturing cost of the actuator 130 can be reduced.
The present application further provides an automobile comprising: the variable compression ratio engine, the wheels and the transmission mechanism, wherein the transmission mechanism is connected with the wheels and the variable compression ratio engine.
The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described, it is understood that the above embodiments are illustrative and should not be construed as limiting the present application and that various changes, modifications, substitutions and alterations can be made therein by those skilled in the art within the scope of the present application, and therefore all changes and modifications that come within the meaning of the claims and the description of the invention are to be embraced therein.
Claims (10)
1. A compression ratio switching apparatus for a variable compression ratio engine including a drive link provided with a switch for adjusting a working length of the drive link, characterized by comprising:
the actuating rod is provided with a shifting fork, and an opening of the shifting fork faces to the change-over switch;
the mounting seat is used for being assembled and connected with a cylinder body of the variable compression ratio engine, and the actuating rod is slidably mounted on the mounting seat;
and the driver is in transmission connection with the execution rod and drives the execution rod to slide along the axial direction of the execution rod, so that the shifting fork can shift the change-over switch and adjust the working length of the driving connecting rod.
2. The compression ratio switching device according to claim 1, wherein the actuator comprises a motor and a driving actuator, and the motor drives the actuator rod to slide along the axial direction of the actuator rod through the driving actuator.
3. The compression ratio switching device according to claim 2, wherein the actuator includes a connecting shaft and a toggle pin, one end of the connecting shaft is provided with a toggle slot, the other end of the connecting shaft is connected to the motor, one end of the toggle pin is connected to the actuating rod, one end of the toggle pin is disposed in the toggle slot, the toggle pin and the connecting shaft are disposed in parallel and spaced apart from each other, the motor drives the connecting shaft to rotate, and the connecting shaft toggles the toggle pin through the toggle slot to drive the actuating rod to slide along the axial direction of the actuating rod.
4. The compression ratio switching device according to claim 1, further comprising a stopper block assembled with the actuating rod, the stopper block having stopper teeth disposed at intervals, and a part of the structure of the variable compression ratio engine being located between the two stopper teeth.
5. The compression ratio switching apparatus according to claim 4, wherein the stopper and the actuating rod are positioned by a positioning pin and connected by a threaded fastener.
6. The compression ratio switching apparatus according to claim 1, wherein the mounting seat comprises an upper seat and a lower seat which are connected, a mounting cavity is formed between the upper seat and the lower seat, the actuating rod is located in the mounting cavity, and the upper seat is assembled and connected with the cylinder body.
7. The compression ratio switching apparatus according to claim 6, further comprising a rotation stopping pin, wherein a sliding groove extending axially along the actuating rod is provided on the upper support, one end of the rotation stopping pin is connected to the actuating rod, and the other end of the rotation stopping pin is located in the sliding groove.
8. The compression ratio switching apparatus according to claim 1, wherein a plurality of said shift forks are provided at intervals in an axial direction of said actuating rod.
9. A variable compression ratio engine characterized by comprising:
a cylinder body;
the driving connecting rod is arranged on the cylinder body through a crankshaft, and a change-over switch for adjusting the working length of the driving connecting rod is arranged on the driving connecting rod;
the piston is arranged at one end of the driving connecting rod, which is far away from the crankshaft;
a compression ratio switching apparatus according to any one of claims 1 to 8, which is assembled with the cylinder block, wherein during the rotation of the crankshaft, the switch is close to the compression ratio switching apparatus, and the shift fork of the compression ratio switching apparatus shifts the switch to adjust the working length of the driving link, thereby adjusting the distance between the piston and the crankshaft.
10. An automobile, comprising:
the variable compression ratio engine according to claim 9;
a wheel;
and a transmission mechanism connecting the wheels and the variable compression ratio engine.
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| CN202210197062.0A CN115217640A (en) | 2022-03-01 | 2022-03-01 | Compression ratio switching device, variable compression ratio engine and automobile |
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| CN202210197062.0A CN115217640A (en) | 2022-03-01 | 2022-03-01 | Compression ratio switching device, variable compression ratio engine and automobile |
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