CN212272335U - Valve lift switching actuating mechanism and engine with variable valve lift - Google Patents
Valve lift switching actuating mechanism and engine with variable valve lift Download PDFInfo
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- CN212272335U CN212272335U CN202020202063.6U CN202020202063U CN212272335U CN 212272335 U CN212272335 U CN 212272335U CN 202020202063 U CN202020202063 U CN 202020202063U CN 212272335 U CN212272335 U CN 212272335U
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Abstract
The utility model provides an engine with a valve lift switching actuating mechanism and a variable valve lift, which comprises an actuator unit and a reversing unit, wherein the actuator unit comprises a shell, a pin arranged in the shell, an electromagnetic assembly driving the pin to extend out of the shell, a sampling module sampling the current of a winding coil in the electromagnetic assembly, and a connecting port for electrically connecting the winding coil and the sampling module with an external controller; the reversing unit comprises a reversing base and a reversing assembly hinged to the reversing base, and the reversing assembly is configured to be pushed by an extended pin to pivot so as to output an actuating force for switching the valve lift. The utility model discloses a to the sampling of winding coil current, can acquire the resistance of winding coil in real time to confirm the duty cycle of the driving voltage that external control ware should export based on this resistance, can improve actuating mechanism's control accuracy from this.
Description
Technical Field
The utility model relates to the technical field of engines, in particular to actuating mechanism is switched in valve lift, simultaneously, the utility model discloses also relate to the engine of the variable valve lift that has above actuating mechanism.
Background
The valve operating parameters of the valve train of the traditional engine are fixed and the parameters are determined according to the designed working condition point. The variable valve mechanism is used for changing the operating parameters of the valve along with the change of the working condition of the engine, so that the dynamic property, the economical efficiency and the idling stability of the engine are improved to a certain extent, and the emission of HC and NOx is reduced.
With the continuous development of the variable valve lift technology, the adjusting structure of the variable valve lift is more and more diverse, taking the currently applied adjusting structure with two valve lift positions as an example, the adjusting structure can realize the adjustment of the valve lift by controlling an actuator for switching the lift according to the change of the load working condition of an engine. Specifically, when the lift needs to be switched based on the engine load condition, the actuator is controlled to act to switch the lift, and the variable valve mechanism is kept in the switched lift state through continuous control of the actuator. When the load working condition of the engine changes and the original valve lift needs to be switched back, the controller cuts off the control of the actuator, and the variable valve mechanism automatically returns to the original lift.
In the valve lift adjusting structure, the lift switching actuator plays an extremely important role, and in order to ensure the reliability of the mechanism when the valve lift adjusting structure is maintained in a switched lift state, the actuator needs to generate enough thrust, and at the moment, a continuous large current is generated in a winding coil of the actuator, and the large current also causes a large amount of heat to be generated in the winding coil of the actuator. The resistance value of the winding coil changes along with the temperature rise of the actuator, and the change of the resistance value of the winding coil causes the current in the circuit to change constantly due to the fact that the power supply voltage of the whole vehicle is generally stable, so that the control precision of the actuator can be seriously influenced, the actuator is difficult to control stably, and the adjustment function of the actuator is further reduced.
Therefore, in order to ensure the control accuracy of the actuator, the resistance of the actuator winding coil is required not to change greatly during operation, but this makes it difficult to select the material of the actuator winding coil, which increases the cost.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to a valve lift switching actuator, which can at least improve the control accuracy of the actuator.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a valve lift switching actuator comprising an actuator unit and a reversing unit, wherein:
the actuator unit comprises a shell, a pin arranged in the shell, an electromagnetic assembly driving the pin to axially slide and enabling the pin to extend out of the shell, a sampling module sampling current of a winding coil in the electromagnetic assembly, and a connecting port for electrically connecting the winding coil and the sampling module with an external controller;
the reversing unit comprises a reversing base fixedly connected with the shell and a reversing assembly hinged on the reversing base, and the reversing assembly is configured to be pushed by the extending pin to pivot so as to output an actuating force for switching the valve lift;
wherein the sampling module outputs a sampling signal to the external controller, and the external controller is responsive to the sampling signal of the sampling module to adjust a duty ratio of the driving voltage output to the winding coil.
Furthermore, the sampling module comprises a sampling resistor connected in series with the winding coil, and the sampling module samples the current of the winding coil for outputting a voltage signal of the sampling resistor.
Furthermore, the resistance value of the sampling resistor is 10-20m omega.
Furthermore, the sampling module further comprises a differential amplification circuit for amplifying the collected voltage signal of the sampling resistor.
Further, the sampling module further comprises a level shift circuit for outputting the sampling signal of the sampling module to the external controller.
Furthermore, an elastic piece is arranged in the shell, and when the extended pin retracts, the elastic piece can apply elastic jacking force to the pin.
Further, be equipped with the PCB board in the casing, the sampling module is located on the PCB board, connection port locates on the casing.
Furthermore, the housing comprises a lower housing with an accommodating cavity and an upper housing covering the accommodating cavity, the pin, the electromagnetic assembly and the PCB are disposed in the accommodating cavity, and the connection port is located on the upper housing.
Furthermore, the reversing base is fixedly connected to the lower shell, and the reversing assembly is a reversing block hinged to the reversing base.
Compared with the prior art, the utility model discloses following advantage has:
the utility model discloses an actuating mechanism is switched in valve lift, through the sampling to winding coil current, can acquire the resistance of winding coil in real time, and confirm the drive voltage's that external control ware should export duty cycle based on this resistance, can utilize the real-time adjustment to drive voltage duty cycle from this, make the electric current of winding coil keep switching drive current threshold value in the lift that sets up, therefore can improve actuating mechanism's control accuracy, in order to guarantee that variable valve lift mechanism accurately realizes the switching of valve lift.
Furthermore, the utility model discloses a sampling resistor is and through the collection to sampling resistor voltage to indirectly obtain the electric current of winding coil, its simple structure easily realizes, and further setting through differential amplifier circuit can effectively amplify the voltage signal of gathering, and level shift circuit's adoption can carry out the differentiation to circuit short land or short circuit fault, can do benefit to and realize the circuit diagnosis.
Another object of the present invention is to provide an engine with variable valve lift, wherein the valve lift switching actuator is disposed in the engine.
The utility model discloses an engine can improve actuating mechanism's control accuracy through adopting aforementioned valve lift to switch actuating mechanism, can guarantee that variable valve lift mechanism accurately realizes the switching of valve lift, and has fine practicality.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a schematic structural diagram of an actuator according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an actuator unit according to a first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a sampling module according to a first embodiment of the present invention;
fig. 4 is a schematic diagram illustrating the presetting of the operating current of the actuator according to the first embodiment of the present invention;
description of reference numerals:
1-an actuator unit and 2-a reversing unit;
101-lower shell, 102-upper shell, 103-pin, 104-winding coil, 105-winding mandrel, 106-PCB, 107-connection port, 108-sampling resistor, 109-differential amplification circuit, 1010-level shift circuit, 1011-external controller and 1012-relay;
201-reversing base, 202-reversing block, 203-hinging shaft.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments 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 embodiment relates to a valve lift switching actuating mechanism, wherein an engine applying the valve lift switching actuating mechanism is in a valve lift adjusting mode with two valve lift positions, and the valve lift can be adjusted by controlling the valve lift switching actuating mechanism according to the change of the load working condition of the engine in the running process of the engine.
Specifically, when the lift needs to be switched based on the engine load condition during the operation of the engine, the actuator is controlled to operate to switch the lift, and the variable valve mechanism is kept in the switched lift state through continuous control of the actuator. When the load working condition of the engine changes and the original valve lift needs to be switched back, the control on the actuating mechanism is cut off, and the variable valve mechanism can automatically return to the original lift.
In detail, as shown in fig. 1 to 3 in conjunction, the valve lift switching mechanism of the present embodiment integrally includes an actuator unit 1 and a direction switching unit 2. The actuator unit 1 includes a housing, a pin 103 disposed in the housing, an electromagnetic assembly for driving the pin 103 to axially slide and extend out of the housing, a sampling module for sampling a current of a winding coil 104 in the electromagnetic assembly, and a connection port 107 for electrically connecting the winding coil 104 and the sampling module with an external controller.
The reversing unit 2 of the present embodiment includes a reversing base 201 fixedly connected to the housing, and a reversing assembly hingedly disposed on the reversing base 201, and the reversing assembly is configured to receive the pushing force of the protruding pin 103 and pivot to output the actuating force for performing the valve lift switching. In this embodiment, the sampling module outputs a sampling signal to the external controller 1011, and the external controller 1011 responds to the sampling signal of the sampling module to adjust the duty ratio of the driving voltage output to the winding coil 104, thereby achieving the regulation and control of the real-time current in the winding coil 104.
Based on the above-described overall structural configuration, still referring to fig. 2, as a preferred embodiment, in the actuator unit of the present embodiment, as for a housing that is a basis for the arrangement of the entire actuator unit, it is configured of a lower housing 101 configured with a housing chamber, and an upper housing 102 for covering the housing chamber. The pin 103 and the electromagnetic component are located in the receiving cavity, and meanwhile, the PCB 106 is also disposed in the receiving cavity of the lower housing 101, and the sampling module of this embodiment is located on the PCB 106. The connection port 107 is disposed on the upper housing 102.
Generally, in this embodiment, the lower casing 101 may be formed by casting or machining, the upper casing 102 may be formed by injection molding using plastic, and the upper casing 102 is mounted at the open top of the receiving cavity of the lower casing 101. Meanwhile, the winding coil 104 and the winding mandrel 105 of the electromagnetic assembly in this embodiment are made of conventional materials, and they can be pressed and positioned by the upper housing 102 in the accommodating cavity.
In the present embodiment, when the winding coil 104 is energized, the pin 103 is pushed by the electromagnetic force to extend from the bottom of the lower housing 101, so as to actuate the reversing component in the reversing unit 2, thereby performing the adjustment of the engine valve lift. When the lift of the engine valve needs to return, the winding coil 104 is powered off, and at the moment, the pin 103 can automatically retract into the shell under the action of the engine valve mechanism. In order to avoid damage to the components due to hard contact when the pin 103 retracts, in this embodiment, as a preferred embodiment, as shown in fig. 2, an elastic member capable of applying an elastic pushing force to the pin 103 when the pin 103 retracts is also provided in the housing chamber of the lower case 101.
The elastic element can be, for example, a spring arranged at one end of the pin 103, and the spring can be positioned by a positioning block structure located in the accommodating cavity, a protrusion is formed on the positioning block structure and corresponds to the protrusion, a concave hole is formed at the end of the pin 103, and therefore the elastic element is popped up and sleeved on the protrusion and inserted into the concave hole, and the smoothness of the spring can be well guaranteed in the sliding process of the pin 103.
In this embodiment, as an exemplary setting manner, the sampling module specifically includes a sampling resistor 108 connected in series with the winding coil 104, and at this time, the external controller 1011 is also configured to collect a voltage signal of the sampling resistor 108, so as to indirectly sample the current of the winding coil 104. The value of the sampling resistor 108 can be selected to be 10-20m Ω, and preferably 15m Ω, for example, and in order to improve the accuracy of current sampling, the sampling resistor should also be selected to be a resistor element whose resistance is less affected by temperature change.
When sampling is performed by using the sampling resistors 108 connected in series, in order to ensure that the voltage signal of the sampling resistor 108 can be accurately fed back to the external controller 1011, the sampling module further includes a differential amplifier circuit 109 for amplifying the signal of the voltage signal of the sampling resistor 108. Meanwhile, in addition to the differential amplifier circuit 109, the sampling module of the present embodiment may also be provided with a level shift circuit 1010 for transmitting the amplified voltage signal to the external controller 1011. Here, the differential amplifier circuit 109 and the level shifter circuit 1010 are both common circuit structures used in current/voltage signal transmission processing, and both of them can be implemented by using the conventional circuit structure, and thus the description thereof is omitted.
In the present embodiment, the differential amplifier circuit 109 is used to amplify the collected voltage signal to the range detectable by the external controller 1011 in an equal ratio, and in the configuration of the level shift circuit 109, the general level shift circuit 109 can shift the initial voltage signal in the circuit by 0.5v, when the circuit is short-circuited, a voltage of 0.5v can be output due to the shift, and when the circuit is short-circuited to ground, the output voltage is 0v, so that the differential amplifier circuit can be used to distinguish the short-circuit or short-circuit fault, and implement circuit diagnosis.
In the present embodiment, the external controller 1011 described above may be an ECU of the engine. In addition, for the aforementioned reversing unit 2, the reversing base 201 therein is directly fixedly connected to the bottom of the lower casing 101, and the reversing component in the reversing unit 2 may be specifically a reversing block 202 hinged to the reversing base 201 through a hinge shaft 203. Based on the direction shown in fig. 1, under the driving of the sliding of the pin 103 in the vertical direction, the hinged reversing block 202 receives the driving of the pin 103, and can rotate to form a displacement in the horizontal direction, thereby further converting the vertical driving force of the actuator into the horizontal driving force.
According to the structure of the actuator of the embodiment described above, during the operation of the engine, the control method of the corresponding valve lift switching actuator specifically comprises the following strategy steps:
step a, when an engine runs in a preset valve lift range, an external controller 1011 detects the load working condition of the engine, and when the lift switching condition is reached, the external controller 1011 is triggered to start lift switching;
step b, when switching is initial, the external controller 1011 outputs an initial driving signal with a preset duty ratio to the winding coil 104 to control the operation of the actuating mechanism;
c, sampling the current of the 104 winding coil working under the initial driving signal through a sampling module, and sending the sampling signal to an external controller 1011 so as to obtain the current resistance value of the winding coil 104 through calculation of the external controller 1011;
step d, the external controller 1011 calculates and obtains the duty ratio of the driving signal output to the winding coil 104 currently according to the current resistance value obtained in the step c and the preset lift switching driving current threshold value in the external controller 1011, and outputs the driving signal of the duty ratio to the winding coil 104;
step e, continuing to sample the current of the winding coil 104 working under the current driving signal through the sampling module, and sending the sampling signal to the external controller 1011 to obtain the current resistance value of the winding coil 104 of the actuator through calculation of the external controller 1011;
step f, the external controller 1011 calculates and obtains the duty ratio of the driving signal output to the winding coil 104 at present through the current resistance value obtained in step e and the lift switching driving current threshold preset in the external controller 1011, and outputs the driving signal of the duty ratio to the actuating mechanism;
step g, repeating the steps e and f, and circulating preset lift switching time to enable the actuating mechanism to complete the switching of the valve lift, and after the valve lift switching is completed, keeping outputting a driving signal to the actuating mechanism;
and h, continuously detecting the load working condition of the engine by the external controller 1011, if the load working condition of the engine does not reach the lift switching condition, maintaining the driving signal output to the actuating mechanism in the step g, and if the load working condition of the engine reaches the lift switching condition, stopping outputting the driving signal to the actuating mechanism by the external controller 1011, and automatically returning the valve lift and the actuating mechanism.
The control method based on the above steps is that at the initial switching, the external controller 1011 first outputs an initial driving signal with a preset duty ratio to the actuator, so as to obtain the current resistance value of the winding coil 104 through the current sampling of the sampling module. Meanwhile, in the subsequent lift switching process, based on the resistance value of the winding coil 104 obtained in the initial state, the drive current threshold value can be switched through a preset lift and the current of the winding coil 104 is sampled, the resistance value of the winding coil 104 can be obtained in real time, and the duty ratio of the drive signal to be output in the next period of the external controller 1011 is determined based on the real-time resistance value, so that the closed-loop control process of the external controller 1011 is realized by utilizing the real-time adjustment of the duty ratio of the drive signal, and further, the current of the winding 104 can be kept at the set lift switching drive current threshold value, so that the control precision of the actuating mechanism is improved.
It should be noted that, after the actuator completes the valve lift switching, the external controller 1011 keeps outputting the driving signal to the actuator so that the actuator can maintain the valve lift at the lift position after the valve lift switching, at this time, the duty ratio of the driving signal output by the external controller 1011 for maintaining the state of the actuator may be set to still keep the current of the winding coil of the actuator at the lift switching driving current threshold, and of course, the working current of the winding coil 104 of the actuator is also kept at the lift switching driving current threshold through the closed-loop control cycle of current sampling.
However, since the lift switching driving current threshold is generally large, if the current of the winding coil 104 is still kept at this current value after the valve lift switching is completed, waste of energy consumption is undoubtedly caused. Thus, as a preferred embodiment, the present embodiment can select, in terms of control, the drive signal that is kept output in the foregoing step g so that the current of the winding coil 104 is smaller than the lift switching drive current threshold.
In this case, to reduce the current of the winding coil 104, specifically, in step g, after the valve lift switching is completed, the following steps may be performed:
step g1. causes the external controller 1011 to change the duty cycle of the output driving signal and to attenuate the current of the winding coil 104 to a preset holding current threshold by sampling the current of the winding coil 104;
step g2., sampling the current of the winding coil 104 working under the current driving signal, sending the sampling signal to the external controller 1011, and calculating by the external controller 1011 to obtain the current resistance value of the winding coil 104;
step g3., the external controller 1011 obtains the duty ratio of the driving signal output to the actuator at present through the current resistance value obtained in step g2 and the preset holding current threshold value calculation, and outputs the driving signal of the duty ratio to the actuator;
step g4. repeats steps g2 and g3, keeping the drive signal output to the winding coil 104 of the actuator.
Through the above steps g1-g4, the duty ratio of the driving signal output by the external controller 1011 can attenuate the operating current held by the winding coil 104 to the holding current threshold, which is smaller than the above-mentioned lift switching driving current threshold. Thus, the effect of reducing energy consumption can be achieved by using the actuator to maintain the reduction of the state current.
In the present embodiment, in the above step g1, the external controller 1011 changes the duty ratio of the output driving signal, and by sampling the current of the winding coil 104 of the actuator, it may be generally set to make the current of the winding coil 104 decay to the preset holding current threshold within the preset current decay time. At this time, based on the preset of the current decay time, the decay rate of the drive current threshold from the lift switching to the holding current threshold for the operating current of the winding coil 104 is determined, that is, the decay rate of the duty cycle of the drive signal periodically output by the external controller 1011 during the current decay is also determined. This can reduce the current of the winding coil 104.
It should be noted, of course, that the duty cycle of the driving signal is changed to decrease the operating current of the winding coil 104 of the actuator to the preset holding current threshold, for this current decay process, it is generally difficult to achieve, in practical implementations, a value that is just such that the operating current of winding coil 104 is reduced to the holding current threshold, and thus, often, it may be set that when the winding coil 104 current is reduced to within an interval including the holding current threshold, the attenuation is considered to reach the position of the holding current threshold, and then the duty ratio of the driving signal output by the controller is continuously adjusted based on the current of the winding coil 104 sampled and obtained by calculation according to the current resistance value of the winding coil 104 and the preset holding current threshold, so that the current of the winding coil 104 is maintained at the holding current threshold.
The protection includes the holding current threshold interval, which may be, for example, a range of ± 0.5A of the holding current threshold, although it may be selected according to specific engine control requirements. Of course, the above-described determination method may be adopted for the arrival of the numerical position such as the lift switching drive current threshold.
For better illustration of the control process of the actuator in the present embodiment, taking fig. 4 as an example, for example, during the actual control process, the preset lift switching driving current threshold in the external controller 1011 is 3A, and the 3A driving current lasts for 67ms to complete the valve lift switching, that is, the preset lift switching time is 67 ms. After the valve lift switching is completed, the current of the winding coil 104 may be decreased to 1A and maintained at a holding current of 1A, that is, the holding current threshold is 1A, and at this time, the decay from 3A to 1A may be completed in a period of 67ms to 85ms, that is, the decay time of the current is 85-67 — 18 ms.
The decreasing current of the winding coil 104 in the interval of 67ms to 85ms is the damping current. After the current of the winding coil 104 is attenuated to 1A, the working current of the actuating mechanism can be kept at the lower current value through a closed-loop control process based on current sampling, so that the energy consumption of the mechanism can be reduced while the position after the valve lift is switched is ensured.
After the valve lift is switched from the preset valve lift, the external controller 1011 still continues to detect the engine load working condition, once the engine load working condition is detected to change, and the valve lift should return to the preset lift, the external controller 1011 cuts off the output of a driving signal of the actuating mechanism, the actuating mechanism does not have an energy source for keeping the valve lift position, at the moment, under the driving of the engine valve mechanism, the valve lift and the pin 103 in the actuating mechanism can return, and then the actuating mechanism enters the preset valve lift to work.
Of course, if the engine load condition detected by the external controller 1011 is still insufficient to return the valve lift to the original position, the external controller 1011 will continue to output the driving signal to the actuator to keep the lift position after switching unchanged. In addition, after the valve lift returns to the preset lift position, the external controller 1011 will, of course, continuously detect the engine load condition, and when the lift switching condition is met, switch the valve lift again, and the control process of the switch again is the same as that described above.
The corresponding relation between the engine load working condition and the valve lift switching condition is set according to specific engine design requirements by referring to the existing engine VVL design experience. The actuator lift switching driving current threshold, the actuator lift switching time, the actuator holding current threshold, the current decay time, etc. may also be selected according to the actual engine design requirements, and the foregoing description of the present embodiment is only an example and is not intended to limit the present invention.
Example two
The present embodiment relates to a variable valve lift engine, and the structural form of the variable valve lift of the engine can be referred to in the related description of the first embodiment, and the engine of the present embodiment is also provided with the valve lift switching execution mechanism as in the first embodiment.
The engine of the embodiment can improve the control precision of the actuating mechanism by adopting the valve lift switching actuating mechanism in the first embodiment, can ensure that the variable valve lift mechanism can accurately realize the switching of the valve lift, and has good practicability.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A valve lift switching actuator comprising an actuator unit (1) and a reversing unit (2), characterized in that:
the actuator unit (1) comprises a shell, a pin (103) arranged in the shell, an electromagnetic assembly driving the pin (103) to axially slide and enabling the pin (103) to extend out of the shell, a sampling module for sampling the current of a winding coil (104) in the electromagnetic assembly, and a connection port (107) for electrically connecting the winding coil and the sampling module with an external controller (1011);
the reversing unit (2) comprises a reversing base (201) fixedly connected with the shell, and a reversing assembly hinged on the reversing base (201) and configured to be pushed by the protruding pin (103) to pivot so as to output an executing force for valve lift switching;
wherein the sampling module outputs a sampling signal to the external controller (1011), and the external controller (1011) is responsive to the sampling signal of the sampling module to adjust a duty cycle of a driving voltage output to the winding coil (104).
2. The valve lift switching actuator of claim 1, wherein: the sampling module comprises a sampling resistor (108) which is connected with the winding coil (104) in series, and the sampling module samples the current of the winding coil (104) for outputting a voltage signal of the sampling resistor (108).
3. The valve lift switching actuator of claim 2, wherein: the resistance value of the sampling resistor (108) is 10-20m omega.
4. The valve lift switching actuator of claim 2, wherein: the sampling module further comprises a differential amplification circuit (109) for performing signal amplification on the acquired voltage signal of the sampling resistor (108).
5. The valve lift switching actuator according to any one of claims 1 to 4, characterized in that: the sampling module further includes a level shift circuit (1010) that outputs a sampling signal of the sampling module to the external controller (1011).
6. The valve lift switching actuator of claim 1, wherein: an elastic piece is arranged in the shell, and when the extended pin (103) retracts, the elastic piece can apply elastic jacking force to the pin (103).
7. The valve lift switching actuator of claim 1, wherein: a PCB (106) is arranged in the shell, the sampling module is positioned on the PCB (106), and the connecting port (107) is arranged on the shell.
8. The valve lift switching actuator of claim 7, wherein: the shell comprises a lower shell (101) with a containing cavity and an upper shell (102) covering the containing cavity, the pin (103), the electromagnetic assembly and the PCB (106) are arranged in the containing cavity, and the connecting port (107) is located on the upper shell (102).
9. The valve lift switching actuator of claim 8, wherein: the reversing base (201) is fixedly connected to the lower shell (101), and the reversing assembly is a reversing block (202) hinged to the reversing base (201).
10. An engine with variable valve lift, characterized in that: the engine is provided with a valve lift switching actuator according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020202063.6U CN212272335U (en) | 2020-02-24 | 2020-02-24 | Valve lift switching actuating mechanism and engine with variable valve lift |
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| CN202020202063.6U CN212272335U (en) | 2020-02-24 | 2020-02-24 | Valve lift switching actuating mechanism and engine with variable valve lift |
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| CN212272335U true CN212272335U (en) | 2021-01-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113587801A (en) * | 2021-07-14 | 2021-11-02 | 潍柴动力股份有限公司 | Valve clearance early warning device, method and equipment and engine |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113587801A (en) * | 2021-07-14 | 2021-11-02 | 潍柴动力股份有限公司 | Valve clearance early warning device, method and equipment and engine |
| CN113587801B (en) * | 2021-07-14 | 2023-05-23 | 潍柴动力股份有限公司 | Valve clearance early warning device, method, equipment and engine |
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