CN108952868B - Variable camshaft and engine adopting same - Google Patents
Variable camshaft and engine adopting same Download PDFInfo
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- CN108952868B CN108952868B CN201810626856.8A CN201810626856A CN108952868B CN 108952868 B CN108952868 B CN 108952868B CN 201810626856 A CN201810626856 A CN 201810626856A CN 108952868 B CN108952868 B CN 108952868B
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- main shaft
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- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 25
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 2
- 239000000446 fuel Substances 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000007789 sealing Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0475—Hollow camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention aims to provide a variable camshaft with simple structure and easy processing and an engine adopting the camshaft, wherein the engine can utilize the camshaft to adjust the valve lift so as to achieve the aim of improving the fuel economy and the dynamic property. The variable camshaft comprises hollow shafts on two sides and a main shaft in the middle, wherein two sides of the main shaft extend into the hollow shaft on the corresponding side and are movably connected with the hollow shaft on the corresponding side through spline matching; the shaft body of the main shaft is provided with at least two cams corresponding to different lift curves; the main shaft and the hollow shaft on at least one side are provided with self-locking mechanisms which are matched with each other so as to fix the position of the main shaft at a preset position; the hollow shaft is equipped with the blanking cover in the one end of keeping away from the main shaft, the blanking cover is equipped with and is used for the fluid pore that links to each other with hydraulic pressure oil pipe. The variable camshaft has the advantages of simple structure, convenient and reliable control, and capability of ensuring good matching of different cams and tappets, and is very suitable for adjusting the lift of the engine valve.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to a camshaft and an engine.
Background
In 2012, the state department has issued a very definite expenditure in "notification of state department about development planning of energy-saving and new energy automobile industry (2012-2020)", and by 2015, the average fuel consumption of the passenger cars produced in the same year is reduced to 6.9 liters/hundred kilometers, and the fuel consumption of the energy-saving passenger cars is reduced to below 5.9 liters/hundred kilometers. In 2020, the average fuel consumption of the passenger cars produced in the same year is reduced to 5.0L/hundred kilometers, and the fuel consumption of the energy-saving passenger cars is reduced to below 4.5L/hundred kilometers. Under such an urgent regulatory environment, a valve control technique, which is one of important means for reducing fuel consumption, is receiving more and more attention from technicians.
The variable valve timing technology and the variable valve lift technology are one of the control means of the valve, wherein the variable valve timing system is widely applied at present, but the application of the variable valve timing system is limited. The variable valve timing system can only control the valve opening to be earlier or later, and the variable valve lift system can realize the valve opening to be larger or smaller according to different structures, can also realize the valve opening to be longer or shorter, and can be matched with the opening of the throttle valve in the small lift, thereby greatly reducing the pumping loss, and reducing the output and the air intake of the engine when the engine is in low load, and further reducing the oil consumption.
A plurality of variable valve lift technologies exist at present, but the common defects are that the structure is complex and the control is inconvenient.
Disclosure of Invention
The invention aims to provide a variable camshaft with simple structure and easy processing and an engine adopting the camshaft, wherein the engine can utilize the camshaft to adjust the valve lift so as to achieve the aim of improving the fuel economy and the dynamic property.
The variable camshaft comprises hollow shafts on two sides and a main shaft in the middle, wherein two sides of the main shaft extend into the hollow shaft on the corresponding side and are movably connected with the hollow shaft on the corresponding side through spline matching; the shaft body of the main shaft is provided with at least two cams corresponding to different lift curves; the main shaft and the hollow shaft on at least one side are provided with self-locking mechanisms which are matched with each other so as to fix the position of the main shaft at a preset position; the hollow shaft is equipped with the blanking cover in the one end of keeping away from the main shaft, the blanking cover is equipped with and is used for the fluid pore that links to each other with hydraulic pressure oil pipe.
The engine comprises the variable camshaft, wherein a hollow shaft on at least one side of the variable camshaft is connected with a timing gear; the oil hole of the hollow shaft is connected with a hydraulic supply device, the hydraulic supply device is connected with the ECU, and the hydraulic supply device provides hydraulic pressure with variable directions for the hollow shaft under the control of the ECU so as to drive the main shaft of the variable camshaft to move towards a preset direction.
The working principle of the engine is as follows:
after the ECU receives a command of changing the valve lift, the hydraulic supply device is controlled to work, high-pressure oil is utilized to push the main shaft to move horizontally, a preset cam on the main shaft is matched with the tappet, and different cams correspond to different lift curves, so that the valve opening size can be changed by changing the cam matched with the tappet, and the valve lift change is realized. The self-locking mechanism can enable the main shaft to stay at a preset position (namely the position where the cam is opposite to the rocker shaft), and the damage of the valve caused by the random movement of the main shaft in the working process is avoided. The main shaft and the hollow shaft are connected in a matched manner between isomorphic flowers, so that the coaxial rotation of the main shaft and the hollow shaft can be ensured.
Specifically, the hydraulic supply device is formed by sequentially connecting an oil pump, a one-way valve and an electromagnetic directional valve, wherein the electromagnetic directional valve is respectively connected with oil liquid pore passages of hollow shafts at two sides; and the oil pump and the electromagnetic directional valve are connected with the ECU. The hydraulic direction can be changed by reversing the electromagnetic reversing valve, so that the main shaft is pushed to move towards different directions.
Further, in order to ensure safety, in the hydraulic supply device, a pipeline between the oil pump and the one-way valve is connected with a pressure release valve, and a pipeline between the one-way valve and the electromagnetic directional valve is connected with an energy accumulator.
In the invention, the self-locking mechanism comprises a conical hole arranged on the main shaft body, and a return spring and a ball pin are arranged in the conical hole; the inner wall of the hollow shaft is provided with positioning concave parts with the same number as the cams at intervals, and the distance between the adjacent positioning concave parts is the same as the distance between the central lines of the adjacent cams. The ball pin extends outwards under the elastic force of the return spring and is clamped into the positioning concave part of the hollow shaft, so that the relative position of the main shaft and the hollow shaft is locked. Because the distance between the adjacent positioning concave parts is the same as the distance between the center lines of the adjacent cams, and the number of the positioning concave parts is the same as that of the cams, when the ball pin is clamped into the positioning concave part, the cam corresponding to the positioning concave part is just positioned at the tappet, and the accurate position of the cam is ensured. Only when the hydraulic pressure provided by the hydraulic pressure supply device exceeds the preset hydraulic pressure, the ball pin can be retracted into the conical hole by overcoming the elastic force of the return spring, and at the moment, the main shaft can move relative to the hollow shaft, so that the adjustment of the valve lift is realized. The tapered holes can prevent the ball pins from completely falling out of the tapered holes.
Furthermore, the number of the conical holes is two, the distance between the two conical holes is the same as that between the adjacent positioning concave parts, so that the positioning of each cam is realized by two ball pins, the problem of positioning failure caused by abnormal work of a single ball pin is solved, and the reliability is improved.
Furthermore, sealing rings are arranged on two sides of the main shaft at positions located in the hollow shaft, the sealing rings are arranged in annular grooves in end portions of two sides of the main shaft, the sealing rings are closer to end portions of the main shaft relative to the spline, and hydraulic oil in the hollow shaft can be prevented from leaking along the joint face of the main shaft and the hollow shaft by the sealing rings.
The variable camshaft has the advantages of simple structure, convenient and reliable control, and capability of ensuring good matching of different cams and tappets, and is very suitable for adjusting the lift of the engine valve.
Drawings
Fig. 1 is a schematic view of the overall structure of a variable camshaft of the present invention.
Fig. 2 is a schematic structural view of the rotating shaft in the present invention.
Fig. 3 and 4 are axial sectional views of the variable camshaft corresponding to different valve lifts.
Fig. 5 is a system schematic diagram of the hydraulic pressure supply apparatus.
The figures are numbered: 1. a hollow shaft; 2. a main shaft; 3. a spline; 4. a cam; 5. a tapered bore; 6. a return spring; 7. a ball pin; 8. a positioning recess; 9. a seal ring; 10. an oil pump; 11. a one-way valve; 12. an electromagnetic directional valve; 13. a pressure relief valve; 14. an accumulator.
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Example 1:
the embodiment provides a variable camshaft with simple structure and easy processing and an engine adopting the camshaft, and the engine can utilize the camshaft to adjust the valve lift so as to achieve the aim of improving the fuel economy and the dynamic property.
As shown in fig. 1 and 2, the variable camshaft of the present embodiment is composed of hollow shafts 1 at two sides and a main shaft 2 at the middle part, wherein two sides of the main shaft 2 extend into the hollow shaft 1 at the corresponding side and are movably connected with the hollow shaft 1 at the corresponding side through spline fit, wherein an external spline 3 is arranged on the shaft body of the main shaft 2, and an internal spline is arranged on the inner wall of the hollow shaft 1; two cams 4 corresponding to different lift curves are arranged in the middle of the shaft body of the main shaft 2 at intervals; the main shaft 2 and the hollow shaft 1 on the left side are provided with self-locking mechanisms which are matched with each other so as to fix the position of the main shaft 2 at a preset position; the hollow shaft 1 of both sides utilizes screw-thread fit to install the blanking cap (the blanking cap is not drawn in the figure) at the one end of keeping away from main shaft 2, the blanking cap is equipped with the fluid pore that is used for linking to each other with hydraulic pressure oil pipe.
In this embodiment, the self-locking mechanism includes two conical holes 5 arranged on the shaft body of the main shaft 2 at intervals, and a return spring 6 and a ball pin 7 are installed in the conical holes 5; two positioning concave parts 8 are arranged on the inner wall of the hollow shaft 1 at intervals, and the distance between the two conical holes 5, the distance between the two positioning concave parts 8 and the distance between the middle lines of the two cams 4 are the same. The ball pins 7 project outward under the spring force of the return spring 6 and snap into the positioning recesses 8 of the hollow shaft 1, thereby locking the relative position of the main shaft 2 and the hollow shaft 1. Because the distance between the adjacent positioning concave parts 8 is the same as the distance between the middle lines of the adjacent cams 4, and the number of the positioning concave parts 8 is the same as that of the cams 4, when the ball pin 7 is clamped into the positioning concave part 8, the cam 4 corresponding to the positioning concave part 8 is just positioned at the tappet, and the accurate position of the cam 4 is ensured. Only when the hydraulic pressure provided by the hydraulic pressure supply device exceeds the preset hydraulic pressure, the ball pin 7 can be retracted into the conical hole 5 against the elastic force of the return spring 6, and the main shaft 2 can move relative to the hollow shaft 1, so that the adjustment of the valve lift is realized. The tapered bore 5 prevents the ball pin 7 from being completely removed from the tapered bore 5.
The sealing rings 9 are arranged at the positions, located in the hollow shaft 1, of the two sides of the main shaft 2, the sealing rings 9 are arranged in annular grooves at the end parts of the two sides of the main shaft 2, the sealing rings 9 are closer to the end parts of the main shaft 2 relative to the spline 3, and the sealing rings 9 can prevent hydraulic oil in the hollow shaft 1 from leaking along the joint surface of the main shaft 2 and the hollow shaft 1.
The engine provided by the embodiment comprises the variable camshaft, wherein at least one side of the hollow shaft 1 of the variable camshaft is connected with a timing gear; the oil hole of the hollow shaft 1 is connected with a hydraulic supply device, the hydraulic supply device is connected with an ECU, and the hydraulic supply device provides hydraulic pressure with variable directions for the hollow shaft 1 under the control of the ECU so as to drive the main shaft 2 of the variable camshaft to move towards a preset direction.
In the embodiment, the hydraulic supply device is formed by sequentially connecting an oil pump 10, a one-way valve 11 and an electromagnetic directional valve 12, and the electromagnetic directional valve 12 is respectively connected with oil liquid pore passages of the hollow shafts 1 at two sides; the oil pump 10 and the electromagnetic directional valve 12 are both connected with the ECU, a pipeline between the oil pump 10 and the one-way valve 11 is connected with a pressure release valve 13, and a pipeline between the one-way valve 11 and the electromagnetic directional valve 12 is connected with an energy accumulator 14. By reversing the direction of the electromagnetic directional valve 12, the hydraulic direction can be changed, thereby pushing the main shaft 2 to move in different directions.
The working principle of the engine is as follows: after the ECU receives a command of changing the valve lift, the hydraulic supply device is controlled to work, high-pressure oil provided by the oil pump is used for pushing the main shaft 2 to move horizontally, a preset cam 4 on the main shaft 2 is matched with the tappet, and different cams 4 correspond to different lift curves, so that the opening size of the valve can be changed by changing the cam 4 matched with the tappet, and the valve lift change is realized. The self-locking mechanism can enable the main shaft 2 to stay at a preset position (namely the position where the cam 4 is opposite to the rocker shaft), and the damage of the valve caused by the random movement of the main shaft 2 in the working process is avoided. The main shaft 2 and the hollow shaft 1 are in fit connection with each other, so that the coaxial rotation of the main shaft and the hollow shaft can be ensured.
The specific process is as follows:
when the ECU receives a command of moving the cam 4 from the position shown in the figure 3 to the position shown in the figure 4, the hydraulic supply device starts to work, high-pressure oil provided by the hydraulic supply device enters the inner cavity of the hollow shaft 1 on the left side, the main shaft 2 is pushed to move rightwards, the rightwards axial force overcomes the elastic force of the return spring 6, the ball pin 7 enters the conical hollow hole, the main shaft 2 integrally moves rightwards until the main shaft 2 reaches the maximum displacement rightwards, the ball pin 7 pops out under the elastic force of the return spring 6 and partially enters the positioning concave part 8, the locking of the position of the main shaft 2 is completed, at the moment, the hydraulic supply device stops working, the pressure relief process is completed, and the switching process of the whole cam 4.
The process of moving the cam 4 from the position shown in fig. 4 to the position shown in fig. 3 is similar to the above process, except that the high-pressure oil supplied by the hydraulic supply device enters the inner cavity of the hollow shaft 1 on the right side, and the detailed process is not repeated here.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description, as long as the invention is capable of being practiced without modification in any way whatsoever, and is capable of other applications without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A variable camshaft is characterized by comprising hollow shafts on two sides and a main shaft in the middle, wherein two sides of the main shaft extend into the hollow shaft on the corresponding side and are movably connected with the hollow shaft on the corresponding side through spline matching; the shaft body of the main shaft is provided with at least two cams corresponding to different lift curves; the main shaft and the hollow shaft on at least one side are provided with self-locking mechanisms which are matched with each other so as to fix the position of the main shaft at a preset position; the hollow shaft is provided with a blocking cover at one end far away from the main shaft, the blocking cover is provided with an oil hole channel used for being connected with a hydraulic oil pipe, and the oil hole channels of the hollow shafts at two sides are respectively connected with the electromagnetic directional valves; the self-locking mechanism comprises a conical hole arranged on the main shaft body, and a return spring and a ball pin are arranged in the conical hole; the inner wall of the hollow shaft is provided with positioning concave parts with the same number as the cams at intervals, and the distance between every two adjacent positioning concave parts is the same as the distance between the central lines of the adjacent cams; the number of the conical holes is two, and the distance between the two conical holes is the same as the distance between the adjacent positioning concave parts.
2. The variable camshaft according to claim 1, wherein the main shaft is provided at both sides thereof with seal rings at positions within the hollow shaft, the seal rings being disposed in annular grooves at both side end portions of the main shaft, and the seal rings being closer to the end portions of the main shaft with respect to the splines.
3. An engine characterized by comprising the variable camshaft of claim 1, at least one side of which has a hollow shaft connected to a timing gear; the oil hole of the hollow shaft is connected with a hydraulic supply device through an electromagnetic directional valve, the hydraulic supply device is connected with the ECU, and the hydraulic supply device provides hydraulic pressure with variable directions for the hollow shaft under the control of the ECU so as to drive the main shaft of the variable camshaft to move towards the preset direction.
4. The engine of claim 3, wherein said hydraulic supply means is comprised of an oil pump, a check valve, a connection; the electromagnetic directional valve is connected with the one-way valve, and the oil pump and the electromagnetic directional valve are connected with the ECU.
5. An engine according to claim 3, wherein the hydraulic supply means is such that the conduit between the oil pump and the check valve is connected to a pressure relief valve and the conduit between the check valve and the solenoid operated directional valve is connected to an accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810626856.8A CN108952868B (en) | 2018-06-19 | 2018-06-19 | Variable camshaft and engine adopting same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810626856.8A CN108952868B (en) | 2018-06-19 | 2018-06-19 | Variable camshaft and engine adopting same |
Publications (2)
| Publication Number | Publication Date |
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| CN108952868A CN108952868A (en) | 2018-12-07 |
| CN108952868B true CN108952868B (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810626856.8A Active CN108952868B (en) | 2018-06-19 | 2018-06-19 | Variable camshaft and engine adopting same |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6853839B2 (en) * | 2019-01-08 | 2021-03-31 | 本田技研工業株式会社 | Internal combustion engine auxiliary equipment |
| CN110374705A (en) * | 2019-05-25 | 2019-10-25 | 全椒县全动机械有限公司 | A kind of engine variable camshaft |
| CN111911257A (en) * | 2020-06-30 | 2020-11-10 | 中国北方发动机研究所(天津) | Combined type distribution camshaft |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182529A (en) * | 2011-05-24 | 2011-09-14 | 奇瑞汽车股份有限公司 | Variable lift camshaft |
| CN104271903A (en) * | 2012-04-28 | 2015-01-07 | 奥迪股份公司 | Valve drive of an internal combustion engine |
| DE102014116252A1 (en) * | 2014-11-07 | 2016-05-12 | Thyssenkrupp Presta Teccenter Ag | Camshaft with an axially guided sliding element |
| CN106870056A (en) * | 2017-03-01 | 2017-06-20 | 绵阳深度数控科技有限公司 | Cam pack structure |
| CN107956532A (en) * | 2017-11-22 | 2018-04-24 | 贵阳吉利发动机有限公司 | A kind of engine two-stage adjustable air valve lift device |
| CN108167043A (en) * | 2017-12-20 | 2018-06-15 | 广州汽车集团股份有限公司 | Variable air valve lift apparatus and automobile |
-
2018
- 2018-06-19 CN CN201810626856.8A patent/CN108952868B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182529A (en) * | 2011-05-24 | 2011-09-14 | 奇瑞汽车股份有限公司 | Variable lift camshaft |
| CN104271903A (en) * | 2012-04-28 | 2015-01-07 | 奥迪股份公司 | Valve drive of an internal combustion engine |
| DE102014116252A1 (en) * | 2014-11-07 | 2016-05-12 | Thyssenkrupp Presta Teccenter Ag | Camshaft with an axially guided sliding element |
| CN106870056A (en) * | 2017-03-01 | 2017-06-20 | 绵阳深度数控科技有限公司 | Cam pack structure |
| CN107956532A (en) * | 2017-11-22 | 2018-04-24 | 贵阳吉利发动机有限公司 | A kind of engine two-stage adjustable air valve lift device |
| CN108167043A (en) * | 2017-12-20 | 2018-06-15 | 广州汽车集团股份有限公司 | Variable air valve lift apparatus and automobile |
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| CN108952868A (en) | 2018-12-07 |
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