WO2014110969A1 - Appareil d'entraînement avec levée de soupape variable - Google Patents

Appareil d'entraînement avec levée de soupape variable Download PDF

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Publication number
WO2014110969A1
WO2014110969A1 PCT/CN2013/090810 CN2013090810W WO2014110969A1 WO 2014110969 A1 WO2014110969 A1 WO 2014110969A1 CN 2013090810 W CN2013090810 W CN 2013090810W WO 2014110969 A1 WO2014110969 A1 WO 2014110969A1
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WO
WIPO (PCT)
Prior art keywords
valve
gear
swing arm
shaft
rotation center
Prior art date
Application number
PCT/CN2013/090810
Other languages
English (en)
Chinese (zh)
Inventor
尹吉
刘胜强
林文
刘涛
王宁
张帅
陈涛
孙建军
侯振鹏
Original Assignee
长城汽车股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201310016079.2A external-priority patent/CN103925036B/zh
Priority claimed from CN201310014309.1A external-priority patent/CN103925029B/zh
Application filed by 长城汽车股份有限公司 filed Critical 长城汽车股份有限公司
Publication of WO2014110969A1 publication Critical patent/WO2014110969A1/fr

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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
    • 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
    • F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • Variable valve lift drive device The present application is filed on January 15, 201, the Chinese Patent Office, Application No. 201 31 0014309. K The invention is entitled “Variable Valve Lift Drive” and January 15, 2013 Japanese Patent Application No. 201 310016079. The priority of the Chinese patent application entitled “Variable Valve Lifting Device” is incorporated herein by reference.
  • the present invention relates to engine components, and more particularly to a variable valve lift drive.
  • valve lift refers to the height at which the valve moves from just opening to fully opening, that is, the opening height of the valve.
  • the cam profile of the camshaft used in the engine is different, and the valve lift obtained is also different.
  • the valve lift of a conventional engine is fixed, that is, there is only one cam profile of the camshaft, and the lift design is a balance selection of the engine under full working conditions, so the lift is impossible to make the engine Both the high-speed zone and the low-speed zone are well-received. As a result, the engine does not get the best high-speed efficiency, and the optimal low-speed torque is not obtained, but the performance is balanced under all working conditions.
  • variable valve lift technology (VVL, va ri ab le va l ve lift ) can change the valve lift according to different operating conditions of the engine, so that the engine can get good response in both the high speed zone and the low speed zone, thereby improving the engine.
  • High speed power and low speed torque The specific performance is as follows: Matching the appropriate valve lift at different engine speeds, the system uses a smaller valve lift at low speed, which is beneficial to increase the intensity of the airflow in the cylinder, increase the combustion speed, reduce the inflation time, and thus improve the low speed of the engine. Torque, reducing fuel consumption, and using a larger valve lift at high speeds can significantly increase the charge factor, which in turn increases the power output at high speeds.
  • the existing variable valve lift technology can be divided into a segmented variable valve lift and a continuously variable valve lift according to its control effect. Compared with the segmented variable valve lift, the continuously variable valve lift can better match the combustion system of the engine and has certain advantages.
  • different valve lifts are obtained by changing the cam profile of the camshaft.
  • the specific method is to use a combined camshaft, wherein the combined camshaft is provided with a plurality of cams having different profiles, and the different cam profiles on the combined camshaft drive the valve links to reciprocate, thereby The valve lift is variable.
  • the camshaft, the valve connecting rod and the like are subjected to different degrees of impact loads, thereby reducing the service life of the components.
  • the combined camshaft is more complex and of higher quality than the conventional camshaft, which increases the machining cost and fuel consumption of the engine.
  • Embodiments of the present invention provide a variable valve lift driving device to improve the service life of components and reduce the processing cost and fuel consumption of the engine.
  • the variable valve lift driving device provided by the present invention includes a valve, a valve connecting valve connected to the valve, a valve rocker arm connected to the valve connecting rod, and a driving device.
  • a cam shaft that opens or closes a valve, a swing arm and an adjustment gear are disposed between the valve rocker arm and the cam shaft;
  • the swing arm is provided with a first rotation center and a second rotation center, and the adjustment gear is provided with a drive
  • the camshaft rotates
  • the swing arm is swung around the first rotation center to drive the valve link to linearly reciprocate to realize the opening or closing of the valve.
  • the adjustment gear rotates around its gear shaft
  • the driving portion is rotated around the gear shaft to make the first The center of rotation rotates about the second center of rotation.
  • the driving portion is a through hole provided on the adjusting gear and a rotating shaft disposed in the through hole, the first rotating center is a first through hole, and the rotating shaft is disposed at the first pass Inside the hole.
  • the second rotation center is a second through hole
  • the second through hole is provided with a pin shaft
  • the pin shaft is coaxially disposed with the gear shaft of the adjustment gear
  • the pin is mounted with the cam cooperative Swing arm roller.
  • the adjusting gear is a helical gear
  • the helical gear is meshed with a transmission gear
  • the transmission gear is connected with a driving source.
  • the camshaft is supported on the bearing housing, and the bearing seat is further provided with a mounting hole, and the gear shaft is disposed in the mounting hole.
  • a pin is arranged between the gear shaft and the mounting hole, and the pin is sealed by a screw plug, and the screw plug is provided with a drain hole.
  • the rotating shaft is provided with a return spring, one end of the return spring is connected with the adjusting gear, and the other end is connected with the swing arm.
  • the valve includes a first valve and a second valve
  • the valve link includes a first valve link connected to the first valve and a second valve link connected to the second valve
  • the valve rocker arm includes a first valve rocker arm coupled to the first valve link and a second valve rocker arm coupled to the second valve link, the camshaft driving the first valve and the first a two-valve opening or closing
  • the swing arm includes a first swing arm and a second swing arm
  • the adjustment gear includes a first adjustment gear and a second adjustment gear
  • the first swing arm and the first adjustment a gear is disposed between the first valve rocker arm and a camshaft
  • the second swing arm and a second adjustment gear are disposed between the second valve rocker arm and the camshaft
  • the second swing arm has the first rotation center and the second rotation center
  • the first adjustment gear is provided with a first driving portion
  • the second adjustment gear is provided with a second driving portion
  • the second rotation center on the first swing arm is coaxial with the first gear shaft
  • the second center of rotation on the second swing arm and the second gear shaft are coaxially disposed.
  • the first gear shaft and the second gear shaft are coaxially disposed.
  • the first adjustment gear is meshed with a first transmission gear
  • the second adjustment gear is meshed with a second transmission gear
  • the first transmission gear is rigidly coupled to the first transmission shaft
  • the second The transmission gear is rigidly coupled to the second transmission shaft
  • the second transmission shaft drives the first transmission shaft to rotate.
  • the first transmission shaft is sleeved on the second transmission shaft and connected by a radially extending positioning pin, and the first transmission shaft is provided with a sliding slot for sliding the positioning pin in the circumferential direction. Further, the second transmission gear and the second transmission shaft are connected by the positioning pin.
  • the first driving portion is a first rotating shaft rigidly connected to the first adjusting gear
  • the first rotating center is a third through hole
  • the first rotating shaft is disposed in the third through hole
  • the second driving portion is a second rotating shaft rigidly connected to the second adjusting gear
  • the third rotating center is a fourth through hole
  • the second rotating shaft is disposed in the fourth through hole.
  • the second center of rotation is a fifth through hole, and the first through hole is disposed in the fifth through hole, and the first pin shaft is mounted with a first swing arm roller that cooperates with a cam of the cam shaft;
  • the fourth rotating center is a sixth through hole, the sixth through hole is provided with a second pin, and the second pin is mounted with a second swing arm roller that cooperates with the cam of the cam shaft.
  • the circumferential position of the first center of rotation relative to the second center of rotation changes, thereby achieving a varying valve lift, achieving a different valve lift drive depending on the engine Use the operating conditions to change the valve lift.
  • the method of realizing the variable valve lift is different, and the camshaft, the valve connecting rod and the like are not impacted by changing the cam with different profiles to drive the valve linkage, and the cam is extended.
  • the service life of the shaft, the valve linkage and the like are related; and since a plurality of cams having different profiles are not disposed on the camshaft, the camshaft used in conjunction with the swing arm in the embodiment of the present invention has a simple structure and quality. Small, reducing engine processing costs and fuel consumption.
  • FIG. 1 is a schematic structural view of a variable valve lift driving device according to Embodiment 1 of the variable valve lift driving device of the present invention
  • FIG. 2 is a schematic exploded view of FIG. 1
  • FIG. 3 is a structural structure of the adjusting gear shown in FIG.
  • Figure 4 is a schematic view of the structure of the swing arm shown in Figure 2
  • Figure 5 is a front view of the adjustment gear shown in Figure 2
  • Figure 6 is a schematic view of the structure of the bearing block shown in Figure 2
  • FIG. 8 is a graph showing the relationship between different valve lifts and crank angles
  • FIG. 9 is a variable valve lift provided by Embodiment 2 of the variable valve lift driving device of the present invention.
  • FIG. 10 is a schematic structural view of the driving device;
  • FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention.
  • the variable valve lift driving device comprises a valve, a valve connecting rod connected to the valve, a valve rocker arm connected to the valve connecting rod, and a cam shaft driving the valve to open or close, in the valve rocker arm and a swing arm and an adjustment gear are arranged between the camshafts; a rotating center and a second rotating center, wherein the adjusting gear is provided with a driving portion, and when the cam shaft rotates, the swing arm is swung around the first rotating center to drive the valve link to linearly reciprocate to realize opening or closing of the valve, and adjusting the gear winding When the gear shaft of the own shaft rotates, the driving portion is rotated around the gear shaft to rotate the first center of rotation about the second center of rotation.
  • the adjustment gear rotates about its own gear shaft
  • the drive portion is rotated about the gear shaft to rotate the first center of rotation about the second center of rotation.
  • the circumferential position of the first center of rotation relative to the second center of rotation changes, thereby achieving a varying valve lift, achieving a different valve lift drive depending on the engine Use the operating conditions to change the valve lift.
  • the manner of the door lift is different, and the camshaft, the valve connecting rod and the like are not impacted by changing the cam with different profiles to drive the valve linkage, and the camshaft and the valve linkage are extended.
  • the camshaft used in conjunction with the swing arm in the embodiment of the present invention has a simple structure and a small mass, and reduces the engine. Processing costs and fuel consumption.
  • variable valve lift driving device 1 Embodiment of variable valve lift driving device 1
  • variable valve lift driving device includes a valve 1, a valve link 2 connected to the valve 1, a valve rocker arm 3 connected to the valve link 2, and a driving valve 1 opened or closed.
  • a camshaft ⁇ between the valve rocker arm 3 and the camshaft 7 is provided with a swing arm 4 and an adjustment gear 5;
  • the swing arm 4 is provided with a first rotation center 42 and a second rotation center 41, and the adjustment gear 5 is provided
  • the driving portion 52 when the cam shaft 7 rotates, drives the swing arm 4 to swing around the first rotation center 42 to drive the valve rod 2 to linearly reciprocate to realize opening or closing of the valve 1, and the adjusting gear 5 is driven around the gear shaft 5 1 of the gear shaft 5
  • the driving portion 52 is rotated about the gear shaft 51 to rotate the first rotation center 42 around the second rotation center 41.
  • variable valve lift driving device when the first rotating center is located at one position, a valve lift can be realized, and when the adjusting gear rotates around its own gear shaft, the driving portion is driven around the gear shaft.
  • Rotating to rotate the first center of rotation about the second center of rotation As the first center of rotation rotates about the second center of rotation, the circumferential position of the first center of rotation relative to the second center of rotation changes, thereby achieving a varying valve lift, achieving a different valve lift drive depending on the engine Use the operating conditions to change the valve lift.
  • variable valve lift is implemented in the embodiment of the present invention
  • the combined camshaft is used to realize the variable valve lift, and the valve link motion is not driven by changing the cams having different profiles. Impact on camshafts, valve linkages, etc., prolonging the service life of camshafts, valve linkages, etc.; and because there are no cams with different profiles on the camshaft,
  • the camshaft used in the swing arm of the embodiment of the invention has a simple structure and small mass, and reduces the processing cost and fuel consumption of the engine.
  • variable valve lift drive integrates both the drive center and the adjustment center on the swing arm, simplifying the structure and reducing the number of components compared to the structure in which the drive center and adjustment center are placed on two components. The number of uses.
  • the adjustment of the position of the first rotation center is achieved by the rotation of the first rotation center around the second rotation center, we can keep the position of the second rotation center unchanged during the adjustment process only to make the first rotation center plane.
  • the movement of the swing arm is simple, and the assembly relationship between the swing arm and other related components is relatively simple, thereby reducing the requirements for machining accuracy and assembly precision.
  • the gear shaft can be referred to as the rotating portion of the adjusting gear, and the adjusting gear of the present invention adjusts the position of the first rotating center, so that the rotating portion and the driving portion can be integrated on the adjusting gear.
  • the rotating portion and the driving portion are disposed on the two components, the structure is simplified, and the number of components used is reduced.
  • FIG. 3 is a schematic structural view of an adjustment gear according to an embodiment of the present invention
  • FIG. 4 is a schematic structural view of a swing arm according to an embodiment of the present invention. As shown in FIG. 3 and FIG.
  • the driving portion on the adjusting gear 5 in this embodiment is a through hole provided on the adjusting gear 5 and a rotating shaft 521 provided in the through hole
  • the swing arm 4 is A center of rotation 42 is a first through hole
  • a rotating shaft 521 is disposed in the first through hole. That is, the rotating shaft simultaneously passes through the through hole on the adjusting gear and the first through hole on the swing arm to realize the connection of the adjusting gear and the swing arm, that is, the first rotating center 42 and the rotating shaft 521 are coaxially disposed.
  • the rotation shaft 522 directly drives the drive center 42 of the swing arm 4 to rotate by a certain angle with respect to the adjustment center 41 of the swing arm 4, so that the angular displacement of the connection between the drive center 42 and the adjustment center 41 can be easily controlled, simplifying The structure and control process.
  • the rotating shaft 521 is preferably formed integrally with the adjusting gear 5, on the one hand simplifying the machining and assembly process and on the other hand avoiding the rotation of the rotating shaft itself.
  • a bearing 21 is disposed between the rotating shaft and the first through hole.
  • the swing arm 4 is rotated about the rotating shaft 122 to open and close the valve.
  • the present invention provides a return spring 522 on the rotating shaft 521, one end of the return spring 522 and the adjusting gear. 5 Connect and connect the other end to the swing arm 4.
  • the return spring 522 drives the swing arm 4 back.
  • the specific implementation of the return spring may be a torsion spring. One end of the torsion spring is inserted into the groove 45 of the swing arm as shown in Fig.
  • the large end of the cam on the camshaft drives the swing arm to rotate in one direction.
  • the small end of the cam contacts the swing arm, and the torsion spring drives the swing arm to rotate in the opposite direction around the drive center. , to achieve the return of the swing arm.
  • the groove 45 makes the return spring 522 easier to fix on the swing arm 4, which is convenient and quick to install, and improves the working stability of the swing arm.
  • the embodiment also provides an annular boss 523 on the rotating shaft 521 and at both ends of the return spring 522 to ensure the stability of the work.
  • the embodiment is provided with an arc deduplication structure 53 and a drain groove 54 on the adjustment gear 5.
  • the heavy structure can reduce the quality while ensuring the strength.
  • the oil drain groove can prevent oil from being stored during the work, increase the weight, and affect the stability of the system work.
  • the second rotation center 41 is a second through hole, and the second through hole is provided with a pin shaft, and the pin shaft is coaxially disposed with the gear shaft of the adjustment gear, and the pin shaft is mounted with Cam-fitted swing arm roller 43.
  • the cam shaft 7 drives the swing arm roller 43 to swing the swing arm 4 around the rotating shaft 521 to realize the opening or closing of the valve 1, and the adjustment gear rotates to rotate the swing arm about the gear shaft 51 to adjust the position of the first rotating center 42.
  • the adjustment gear 5 is a helical gear, the helical gear is meshed with a transmission gear 6, and the transmission gear 6 is connected to a drive source (not shown).
  • the drive source can be a motor or can be a motor and a shifting mechanism connected to the motor, such as a speed reducer.
  • the driving source drives the transmission gear to rotate, and the transmission gear drives the adjustment gear that meshes with the rotation to realize the adjustment of the first rotation center position of the swing arm.
  • the adjustment gear can also be a spur gear that is simpler and more convenient to machine.
  • the cam shaft 7 is supported on the bearing housing 8, and the bearing housing 8 is further provided with a mounting hole 82 through which the gear shaft 51 is bored. In this way, the bearing seat simultaneously functions as a fixed support camshaft and an adjustment gear, which simplifies the structure of the system.
  • an oil passage is arranged around the mounting hole on the bearing seat, and the oil passage is connected to the oil inlet 831 and the oil outlet 832, and an independent oil passage is arranged on the bearing seat to lubricate better result.
  • a pin 81 is provided between the gear shaft 51 and the mounting hole 82, and the pin 81 is sealed by the screw plug 84, and the screw plug 84 is provided with a drain hole.
  • the pin ⁇ can further fix the gear shaft, and the oil drain hole on the screw plug can drain the lubricating oil of the gear shaft.
  • variable valve lift driving device of the present invention includes a valve 1, a valve link 2 connected to the valve 1, a valve rocker arm 3 connected to the valve link 2, and a drive valve opened or closed.
  • Figure 7 shows a total of four rotation centers A, B, C, the contact point of the swing arm 4 with the valve rocker arm 3 is E, the connection line AB of the rotation center A, B and the connection line BC of the rotation center B, C The angle is ⁇ .
  • Case 1 Engine high speed full load operation
  • the ECU (electric control unit) electronic control unit determines the position where the rotation center C should be located, and then calculates the position at which the adjustment gear 5 should be located and infers the angle at which the stepping motor needs to be rotated, and then The signal of the angle is transmitted to the stepping motor. Finally, the stepping motor rotates according to the signal to drive the transmission gear 6.
  • the transmission gear 6 drives the adjustment gear 5 to rotate, so that the rotation center c rotates around the rotation center B until the rotation center reaches the predetermined position.
  • the angle ⁇ is a small angle, such as 125°.
  • the contact point of the swing arm 4 with the valve rocker arm 3 is at the left end position of the swing arm, so that the larger valve lift 1 shown in Fig. 8 can be obtained.
  • the engine can achieve high torque at high speeds.
  • Case 2 The engine is working at low speed and full load
  • the ECU controls the stepping motor in the same way to turn the adjustment gear 3 to another predetermined position.
  • the angle ⁇ between the line AB and the line BC increases, for example, ⁇ is 130°, and the contact point is ⁇ to the right. Therefore, the valve lift 2 obtained is lowered relative to the valve lift 1, but the valve opening and closing timings are constant, so that the engine can obtain a large torque at a low speed in cooperation with the variable valve timing system.
  • Case 3 Partial load operation of the engine
  • the ECU controls the stepping motor in the same way to turn the adjustment gear 3 to another predetermined position.
  • the angle ⁇ between the line AB and the line BC continues to increase, for example, ⁇ is 130° - 160°, and is continuously variable within the angle range.
  • Contact point ⁇ Continue to move to the right. Therefore, the valve lift 3 obtained continues to decrease relative to the valve lift 2, but the valve opening and closing timings are unchanged, so that in conjunction with the variable valve timing system, the pumping loss can be reduced and the engine fuel consumption can be reduced.
  • the ECU controls the stepping motor in the same way to turn the adjustment gear 3 to another predetermined position.
  • the angle ⁇ between the line AB and the line BC continues to increase, for example, ⁇ is 160°.
  • Contact point ⁇ Continue to move to the right.
  • the valve lift 4 thus obtained continues to decrease relative to the valve lift 3, but the valve opening and closing timings are constant, so that the engine idle speed stability is best achieved in conjunction with the variable valve timing system.
  • FIG. 9 is a schematic structural diagram of Embodiment 2 of a variable valve lift driving device according to an embodiment of the present invention
  • FIG. 10 is a schematic exploded view of FIG.
  • the variable valve lift driving device includes a first valve 1a and a second valve 1b, a first valve link 2a connected to the first valve 1a, and a second valve lb connected to the second valve lb.
  • a two-valve link 2b a first valve rocker arm 3a connected to the first valve link 2a, and a second valve rocker arm 3b connected to the second valve link 2b, and driving the first valve 1a and the second valve 1b to open Or a closed camshaft 7, wherein a first swing arm 4a and a first adjustment gear 5a are provided between the first valve rocker arm 3a and the camshaft 7, and between the second valve rocker arm 5b and the camshaft 7
  • the first swing arm 4a is provided with a first rotation center 41a and a second rotation center 42a
  • the second swing arm 4b is provided with a first rotation center 41b and a second The rotation center 42b
  • the first adjustment gear 5a is provided with a first driving portion 51a
  • the second adjustment gear 5b is provided with a second driving portion (blocked, not shown), and the first swing arm is driven when the cam shaft 7 rotates 4a swings around the first rotation
  • variable valve lift driving device when the first rotating center 41 a is located at one position, the first valve can realize a valve lift, when the first adjusting gear is wound around the first
  • the gear shaft rotates
  • the first driving portion is rotated about the first gear shaft to rotate the first rotation center 41 a around the second rotation center 42a.
  • the circumferential position of the first center of rotation 41a relative to the second center of rotation 42a changes, achieving a valve lift of the first valve change.
  • the second valve when the first rotating center 41b is at a position, the second valve can realize a valve lift, and when the second adjusting gear rotates around its second gear shaft, the second driving portion is rotated around the second gear shaft so that First A center of rotation 41b rotates about the second center of rotation 42b.
  • the valve lift driving device provided by the present invention can change the valve lift according to different operating conditions of the engine.
  • variable valve lift is implemented in the embodiment of the present invention
  • the combined camshaft is used to realize the variable valve lift, and the valve link motion is not driven by changing the cams having different profiles. Impact on camshafts, valve linkages, etc., prolonging the service life of camshafts, valve linkages, etc.; and because there are no cams with different profiles on the camshaft,
  • the camshaft used in the swing arm of the embodiment of the invention has a simple structure and small mass, and reduces the processing cost and fuel consumption of the engine.
  • the adjustment process of the valve lift is similar to the adjustment process of the valve lift of the first valve and the second valve described above, and the present invention will not be described herein.
  • the first rotation center 41a can be referred to as the drive center of the valve lift of the first valve
  • the second rotation center 42a can be called It is the adjustment center of the valve lift of the first valve
  • the first rotation center 41b can be referred to as the drive center of the valve lift of the second valve
  • the second rotation center 42b can be referred to as the adjustment center of the valve lift of the second valve.
  • variable valve lift driving device integrateds the driving center and the adjusting center on the swing arm, and is simplified compared to the structure in which the driving center and the adjusting center are disposed on the two components.
  • the structure reduces the number of parts used. Further, since the adjustment of the position of the first rotation center 41a is achieved by the rotation of the first rotation center 41a around the second rotation center 42a, the adjustment of the position of the first rotation center 41b is to surround the second rotation center 42b through the first rotation center 41b.
  • the rotation is realized, so that we can keep the positions of the second rotation center 42a and the second rotation center 42b unchanged during this adjustment process only to make the first rotation center 41a and the first rotation center 41b move in a plane, so that the swing arm
  • the movement form is simple, and the assembly relationship between the swing arm and other related components is relatively simple, thereby reducing the requirements for machining accuracy and assembly precision.
  • the first gear shaft can be referred to as the rotating portion of the first adjustment gear
  • the second gear can be
  • the gear shaft is referred to as a rotating portion of the second adjusting gear
  • the first adjusting gear is used to adjust the position of the first rotating center 41 a
  • the second adjusting gear is used to adjust the position of the first rotating center 41 b.
  • first valve is driven by the first swing arm
  • second valve is driven by the second swing arm
  • first rotation center 41 a of the first swing arm is adjusted by the first adjustment gear
  • first rotation center 41b is adjusted by the second adjustment gear, so that when the working faces of the first swing arm and the second swing arm are the same, we can realize the first change by driving the first adjustment gear and the second adjustment gear.
  • the valve lift of the same or different valve and the second valve will now be described by taking different valve lifts as an example. Only the differences are described in the preferred embodiment, and the commonalities with the above-described embodiment 2 are not repeated.
  • the second rotation center 42a is coaxially disposed with the first gear shaft, and the second rotation center 42b and the second gear shaft are coaxially disposed.
  • the driving force causes the first swing arm to also rotate around the first gear shaft, thereby realizing the first swing arm.
  • the beneficial effect achieved by the coaxial arrangement of the second center of rotation 42b and the second gear shaft is based on the beneficial effect of the coaxial arrangement of the second center of rotation 42a and the first gear shaft.
  • the first gear shaft and the second gear shaft are coaxially disposed. That is, the first gear shaft and the second gear shaft shown in FIG. 10 are both shafts 52a.
  • the shaft 52a is fixed in various manners. For example, a mounting hole 82 is provided in the bearing housing 8 for supporting the cam shaft 7, and the shaft 52a is bored in the mounting hole 82. In this way, the bearing seat simultaneously functions as a fixed support camshaft and an adjustment gear, which simplifies the structure of the system.
  • the first adjustment gear 5a is meshed with the first transmission gear 6a, and the second adjustment gear 5b Engaged with a second transmission gear 6b, the first transmission gear 6a is rigidly connected (for example, an interference press) on the first transmission shaft 7a, and the second transmission gear 6b is rigidly coupled to the second transmission shaft 7b, the second transmission shaft 7b
  • the first transmission shaft 7a is driven to rotate. This has the beneficial effect that only the second drive shaft 7b is connected to the drive source, such as a motor, to reduce the number of components.
  • first transmission shaft and the second transmission shaft may also be respectively connected to the driving source, so that it is easier to realize a different valve lift of the first valve and the second valve, so that eddy current is generated during the intake. Improve engine performance.
  • the first transmission shaft 7a is a hollow shaft and is sleeved on the second transmission shaft 7b, and is connected by a radially extending positioning pin 9. Further, a chute 71a for sliding the positioning pin 9 in the circumferential direction is provided on the first transmission shaft 7a.
  • the relative rotation of the first transmission shaft and the second transmission shaft is realized by the sliding of the positioning pin in the sliding groove, so that the first transmission gear and the second transmission gear generate a certain phase difference
  • the angle at which the first rotation center 41a on the first swing arm and the first rotation center 41b on the second swing arm rotate is inconsistent, and the valve lifts of the first valve and the second valve are also inconsistent.
  • the phase difference between the first transmission gear and the second transmission gear can be achieved by setting different lengths of the chute.
  • the invention is not limited thereto, and the first valve can also be realized by changing the shape and size of the working faces of the first swing arm and the second swing arm or the initial positions of the first rotation center 41 a and the first rotation center 41 b. A valve lift different from the second valve.
  • the second transmission gear 6b and the second transmission shaft 7b of the embodiment of the present invention are connected by a positioning pin 9.
  • the axial dimension of the second transmission gear is lengthened, and a section without teeth is designed, and a through hole 61b is opened in the radial direction in the area, and the positioning pin is inserted into the through hole 61b to realize the second transmission gear 6b. It is rigidly connected to the second transmission shaft 7b.
  • the first driving portion 51 a is a first rotating shaft rigidly connected to the first adjusting gear 5 a
  • the first rotating center 41 a is a third through hole
  • the first rotating shaft is disposed in the third through hole
  • the second driving portion is a second rotating shaft rigidly connected to the second adjusting gear 5b.
  • the first rotating center 41b is a fourth through hole
  • the second rotating shaft is disposed in the fourth through hole. That is, the first rotation center 41a is coaxially disposed with the first rotation axis, and the second rotation center 42a and the second rotation axis are coaxially disposed.
  • the first rotating shaft directly drives the first rotating center 41a of the first swing arm 4a with respect to the first swing arm 4a.
  • the second rotation center 42a rotates through a certain angle
  • the second rotation shaft directly drives the first rotation center 41b of the second swing arm 4b to rotate through a certain angle with respect to the second rotation center 42b of the second swing arm 4b, thereby being able to easily Controlling the angular displacement of the line between the drive center and the adjustment center on the swing arm simplifies the structure and control process.
  • the first rotating shaft is preferably integrally formed with the first adjusting gear, and the second rotating shaft and the second adjusting gear are preferably integrally formed to simplify the processing and assembly process. Due to the first
  • the rotating shaft and the driving center of the first swing arm are coaxially disposed, and the driving centers of the second rotating shaft and the second swing arm are coaxially disposed, so that the first swing arm rotates around the first rotating shaft to realize opening of the first valve and When closed, the second swing arm rotates around the second rotating shaft to open and close the second valve.
  • the second rotation center 42a is a fifth through hole, and the first through hole is disposed in the fifth through hole, and the first pin shaft is mounted with a first swing arm roller 43a that cooperates with the cam of the cam shaft;
  • the second rotation center 42b is a sixth through hole, the second through hole is provided with a second pin shaft, and the second pin shaft is mounted with a second swing arm roller 43b that cooperates with the cam of the cam shaft.
  • the cam of the cam shaft 7 drives the first swing arm roller 43a and the second swing arm roller 43b to swing the first swing arm 4a around the first rotating shaft to open or close the first valve, and the second swing arm 4b surrounds.
  • the second rotation axis swings to open or close the second valve. As shown in FIG. 9 and FIG.
  • the first valve rocker arm 3a is further connected with a hydraulic tappet 10a
  • the second valve rocker arm 3b is also connected with a hydraulic tappet 10b
  • the hydraulic tappets 10a, 10b can make the camshaft 7
  • the contact between the upper cam and the swing arm rollers 43a, 43b, and the contact between the valve rocker arms 3a, 3b and the working portions of the swing arms 4a, 4b maintain a zero clearance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

La présente invention concerne un appareil d'entraînement avec une levée de soupape variable. La présente invention concerne une pièce de moteur et est utilisée pour prolonger la durée de vie d'une pièce et réduire le coût de fonctionnement et la consommation en carburant d'un moteur. L'appareil d'entraînement doté de la levée de soupape variable comprend une soupape, une tige de raccordement de soupape raccordée à la soupape, un culbuteur de soupape raccordé à la tige de raccordement de soupape, et un arbre à cames qui entraîne l'ouverture ou la fermeture de la soupape. Un bras oscillant et un engrenage de réglage sont disposés entre le culbuteur de soupape et l'arbre à cames. Un premier centre de rotation et un second centre de rotation sont disposés sur le bras oscillant. Une partie d'entraînement est disposée sur l'engrenage de réglage. Lorsque l'arbre à cames se met en rotation, il entraîne l'oscillation du bras oscillant autour du premier centre de rotation pour entraîner la tige de raccordement de soupape à effectuer un mouvement de va-et-vient droit, de façon à ouvrir ou fermer la soupape. Lorsque l'engrenage de réglage se met en rotation autour d'un arbre de transmission de l'engrenage de réglage, l'engrenage de réglage entraîne la rotation de la partie d'entraînement autour de l'arbre de transmission, de façon à entraîner la rotation du premier centre de rotation autour du second centre de rotation. La présente invention est utilisée pour rendre une levée de soupape variable en continu.
PCT/CN2013/090810 2013-01-15 2013-12-28 Appareil d'entraînement avec levée de soupape variable WO2014110969A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201310014309.1 2013-01-15
CN201310016079.2 2013-01-15
CN201310016079.2A CN103925036B (zh) 2013-01-15 2013-01-15 可变气门升程驱动装置
CN201310014309.1A CN103925029B (zh) 2013-01-15 2013-01-15 可变气门升程驱动装置

Publications (1)

Publication Number Publication Date
WO2014110969A1 true WO2014110969A1 (fr) 2014-07-24

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336623A (ja) * 2005-06-06 2006-12-14 Toyota Motor Corp 動弁装置の調整方法
US20070295292A1 (en) * 2006-06-27 2007-12-27 Otics Corporation Variable valve mechanism
US20090126666A1 (en) * 2005-09-08 2009-05-21 Mitsuru Sugimoto Engine valve operating system
CN101581240A (zh) * 2009-06-30 2009-11-18 奇瑞汽车股份有限公司 一种连续可变气门升程装置及其控制方法
US20100059005A1 (en) * 2008-09-08 2010-03-11 Stone Albert C Method and apparatus for adjusting variable valve lift
CN201554511U (zh) * 2009-10-23 2010-08-18 上海汽车集团股份有限公司 机械式连续可变气门升程驱动装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336623A (ja) * 2005-06-06 2006-12-14 Toyota Motor Corp 動弁装置の調整方法
US20090126666A1 (en) * 2005-09-08 2009-05-21 Mitsuru Sugimoto Engine valve operating system
US20070295292A1 (en) * 2006-06-27 2007-12-27 Otics Corporation Variable valve mechanism
US20100059005A1 (en) * 2008-09-08 2010-03-11 Stone Albert C Method and apparatus for adjusting variable valve lift
CN101581240A (zh) * 2009-06-30 2009-11-18 奇瑞汽车股份有限公司 一种连续可变气门升程装置及其控制方法
CN201554511U (zh) * 2009-10-23 2010-08-18 上海汽车集团股份有限公司 机械式连续可变气门升程驱动装置

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