Engine with variable valve lift
By adding a speed detector and a reading disc to the engine with variable valve head, combined with a temperature detector, a two-stage process driving connection mechanism is realized, which solves the problem of abnormal sound caused by plunger impact, and significantly improves the engine's Silence performance.
Patent Information
- Application Number
- CN202421222122.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-31
AI Technical Summary
When the existing variable valve head engine connects or separates the first rocker arm and the second rocker arm, it produces a strange sound due to the plunger hitting the limit member or stop member, which affects the user experience.
A speed detector and a reading disc are added to the engine, and the connecting mechanism is driven by a two-stage process to move the connecting pins in segments. The driving signal time point is adjusted in combination with the temperature detector to avoid collision and produce strange sounds.
It effectively reduces the impact sound inside the actuator and improves the silent effect of the engine.
Smart Images
Figure CN222315200U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an engine with a variable valve lift, in particular to an engine with a variable valve lift suitable for a power vehicle. Background Art
[0002] See also Figures 1 to 4 , which are respectively a stereoscopic view, an exploded view, and a cross-sectional view of a cylinder head of a first rocker arm and a second rocker arm in a connected state and a separated state. The figure shows a prior art engine 9 with a variable valve lift as shown in Taiwan Patent Application No. 111209371, which includes: a crankcase 2, a cylinder block 3, a cylinder head 4, a cylinder head cover 41, a camshaft 441, a rocker arm shaft 47, an intake rocker arm assembly 45, an actuator 95, and a control unit (not shown).
[0003] The crankcase 2 includes a crankshaft (not shown) inside, and the cylinder block 3 is disposed on the crankcase 2. The cylinder head 4 includes an upper joint surface 42 and a lower joint surface 43. The lower joint surface 43 of the cylinder head 4 is connected to the cylinder block 3, and the cylinder head cover 41 is connected to the upper joint surface 42. The camshaft 441 is pivoted to the cylinder head 4 and rotated by the crankshaft. The rocker arm shaft 47 is supported by the cylinder head 4. The intake rocker arm assembly 45 includes a first rocker arm 452, a second rocker arm 453 and a connecting mechanism 454. The first rocker arm 452 and the second rocker arm 453 are pivotally mounted on the rocker arm shaft 47 and are driven to rotate by the camshaft 441. The connecting mechanism 454 can slide along the axial direction of the rocker arm shaft 47 to connect or separate the first rocker arm 452 and the second rocker arm 453. The connecting mechanism 454 includes a push rod 4541, a connecting pin 4542 and a return spring 4543. The actuator 95 provides a driving force to push the connecting mechanism 454, including a limiter 51, a stopper 52, a coil 53, a spindle 54 and a plunger 55. The plunger 55 is accommodated in an accommodation space 50 formed by the limiter 51 and the stopper 52. The actuator 95 is fixed to the cylinder head cover 41 with the limiter 51, and the plunger 55 is fixed to the spindle 54 to form a linkage relationship. The spindle 54 and the plunger 55 are inserted into the coil 53. The control unit is electrically connected to the actuator 95 to provide a signal to control the actuator 95, so that the plunger 55 can slide in the accommodation space 50, and the spindle 54 is linked to the connecting mechanism 454, so as to connect or separate the first rocker arm 452 and the second rocker arm 453.
[0004] like Figure 3As shown, when the control unit provides a connection signal to the actuator 95, it will generate a driving force to resist the return spring 4543 so that the connection pin 4542 slides along the axis direction of the rocker shaft 47, thereby connecting the first rocker arm 452 and the second rocker arm 453. When the final connection position is reached, the plunger 55 inside the actuator 95 hits the stopper 51 and generates an abnormal sound. Figure 4 As shown, when the control unit provides a separation signal to the actuator 95, the driving force of the actuator 95 disappears, and the elastic force of the return spring 4543 pushes the connecting pin 4542 to slide along the axial direction of the rocker arm shaft 47, thereby separating the first rocker arm 452 and the second rocker arm 453. When the final separation position is reached, the plunger 55 inside the actuator 95 produces an abnormal sound due to hitting the stopper 52.
[0005] When the mechanism is connected or separated from the first rocker arm 452 and the second rocker arm 453, the plunger 55 hits the limiter 51 or the stopper 52, which generates a strange sound that is disturbing. It is necessary to improve or reduce the volume of the strange sound. For this reason, the inventor, in the spirit of active invention, has been eager to think of an engine with a variable valve lift that can solve the above problems. After several studies and experiments, the present utility model is finally completed. Summary of the invention
[0006] The main purpose of the utility model is to provide an engine with a variable valve lift. A speed detector and a reading disk are added to the existing engine with a variable valve lift to obtain the speed and angle of the camshaft, so that the actuator drives the connecting mechanism to operate in a two-stage process, so that the connecting pin is operated in stages for a first movement amount and a second movement amount, and then the first rocker arm is connected with the second rocker arm to avoid the generation of collision noise inside the actuator, thereby effectively improving or reducing the volume of the noise.
[0007] To achieve the above objectives, the variable valve lift engine of the utility model includes a crankcase, a cylinder block, a cylinder head, a cylinder head cover, a camshaft assembly, a rocker shaft, an intake rocker arm group, a speed detector, an actuator and a control unit.
[0008] The crankcase includes a crankshaft inside, and the cylinder block is arranged on the crankcase. The cylinder head includes an upper joint surface and a lower joint surface, and the lower joint surface of the cylinder head is combined with the cylinder body. The cylinder head cover is combined with the upper joint surface. The camshaft assembly is pivoted on the cylinder head, including a camshaft, a sprocket and a reading disk with at least one protrusion. The camshaft assembly is driven by the crankshaft to rotate through a chain. The camshaft includes a first intake cam and a second intake cam. The first intake cam has a cam base circle part and a cam lift part. In the axial direction of the camshaft, the reading disk and the first intake cam are respectively arranged on both sides of the sprocket. The rocker arm shaft is supported on the cylinder head. The intake rocker arm assembly includes a first rocker arm, a second rocker arm and a connecting mechanism. The first rocker arm and the second rocker arm are pivoted on the rocker arm shaft and rotated by the camshaft. The connecting mechanism can slide along the axis of the rocker arm shaft to connect or separate the first rocker arm and the second rocker arm. The connecting mechanism includes a connecting pin and a return spring. The speed detector assembly is arranged on the cylinder head cover or the cylinder head to detect the rotation signal of at least one bump to obtain the speed and angle of the camshaft.
[0009] The actuator provides a driving force to push the connecting mechanism, so that the first rocker arm and the second rocker arm are connected or separated. The actuator includes a limiter, a stopper, a coil, a spindle and a plunger. The plunger is accommodated in a receiving space formed by the limiter and the stopper. The spindle is fixed to the plunger to form a linkage relationship. The connecting pin is pushed against the spindle by the push of the return spring, and is pushed and moved synchronously by the driving force of the actuator. When the plunger is close to the limiter, the plunger is located at a first position, and when the plunger is close to the stopper, the plunger is located at a second position. The control unit is electrically connected to the actuator and the speed detector to provide a signal to control the actuator so that the plunger can slide in the receiving space, and the spindle is linked to the connecting mechanism to connect or separate the first rocker arm and the second rocker arm.
[0010] Among them, the control unit sends a connection signal to the actuator when the camshaft speed reaches above a specific speed and at a specific angle, and the actuator drives the connection mechanism to operate in a two-stage process, so that the main shaft pushes the connecting pin in a first angle range to complete a first movement amount, and prompts the main shaft to push the connecting pin in a second angle range to complete a second movement amount, thereby connecting the first rocker arm with the second rocker arm, and the plunger reaches the first position when the second movement amount is completed.
[0011] The above-mentioned first angle range may be located within the angle range of the cam base circle of the camshaft's first rotation, and the second angle range may be located within the angle range of the cam base circle of the camshaft's second rotation. The starting angle position of the first angle range is delayed by a delayed angle range than the starting angle position of the cam base circle of the camshaft's first rotation.
[0012] The control unit can send a separation signal to the actuator when the rotation speed of the camshaft reaches below a set rotation speed and at a set angle, so as to cause the first rocker arm to separate from the second rocker arm and the plunger to reach the second position.
[0013] Another object of the utility model is to provide an engine with variable valve lift, by adding a speed detector and a reading disk to the existing engine with variable valve lift to obtain the speed and angle of the camshaft, so that the actuator drives the connecting mechanism to operate in a two-stage process, so that the connecting pin is operated in stages for the first movement amount and the second movement amount, and then the first rocker arm is connected to the second rocker arm. In addition, a temperature detector is added to the existing engine with variable valve lift, because the actuator is affected by the temperature rise and the driving force changes, the sending time of the connection signal of the control unit can be adjusted according to the different detection temperatures provided by the temperature detector, so as to avoid the impact noise inside the actuator, and effectively improve or reduce the volume of the abnormal noise.
[0014] To achieve the above objectives, the variable valve lift engine of the utility model includes a crankcase, a cylinder block, a cylinder head, a cylinder head cover, a camshaft assembly, a rocker shaft, an intake rocker arm group, a speed detector, an actuator, a temperature detector and a control unit.
[0015] The crankcase includes a crankshaft inside, and the cylinder block is arranged on the crankcase. The cylinder head includes an upper joint surface and a lower joint surface, and the lower joint surface of the cylinder head is combined with the cylinder body. The cylinder head cover is combined with the upper joint surface. The camshaft assembly is pivoted on the cylinder head, including a camshaft, a sprocket and a reading disk with at least one protrusion. The camshaft assembly is driven by the crankshaft to rotate through a chain. The camshaft includes a first intake cam and a second intake cam. The first intake cam has a cam base circle part and a cam lift part. In the axial direction of the camshaft, the reading disk and the first intake cam are respectively arranged on both sides of the sprocket. The rocker arm shaft is supported on the cylinder head. The intake rocker arm assembly includes a first rocker arm, a second rocker arm and a connecting mechanism. The first rocker arm and the second rocker arm are pivoted on the rocker arm shaft and rotated by the camshaft. The connecting mechanism can slide along the axis of the rocker arm shaft to connect or separate the first rocker arm and the second rocker arm. The connecting mechanism includes a connecting pin and a return spring. The speed detector assembly is arranged on the cylinder head cover or the cylinder head to detect the rotation signal of at least one bump to obtain the speed and angle of the camshaft.
[0016] The actuator provides a driving force to push the connecting mechanism to connect or separate the first rocker arm and the second rocker arm. The actuator includes a limiter, a stopper, a coil, a spindle and a plunger. The plunger is accommodated in a receiving space formed by the limiter and the stopper. The spindle is fixed to the plunger to form a linkage relationship. The connecting pin is pushed against the spindle by the push of the return spring and is pushed and moved synchronously by the driving force of the actuator. When the plunger is close to the limiter, the plunger is located at a first position. When the plunger is close to the stopper, the plunger is located at a second position. The temperature detector is fixed to the crankcase, cylinder head, cylinder head cover or actuator to detect the temperature of the engine. The control unit is electrically connected to the actuator, the rotation speed detector and reads the temperature of the temperature detector to provide a signal to control the actuator so that the plunger can slide in the accommodating space and the spindle is linked to the connecting mechanism to connect or separate the first rocker arm and the second rocker arm.
[0017] Among them, the control unit sends a connection signal to the actuator when the rotation speed of the camshaft reaches above a specific rotation speed and at a specific angle, and the actuator drives the connection mechanism to operate in a two-stage process, so that the spindle pushes the connecting pin in a first angle range to complete a first movement amount, and prompts the spindle to push the connecting pin in a second angle range to complete a second movement amount, thereby connecting the first rocker arm with the second rocker arm. When the second movement amount is completed, the plunger arrives at the first position. The specific angle and the first angle range vary according to the detection temperature of the temperature detector.
[0018] The first angle range may be within the angle range of the cam base circle of the camshaft during the first rotation, and the second angle range may be within the angle range of the cam base circle of the camshaft during the second rotation. The starting angle position of the first angle range is delayed by a delayed angle range than the starting angle position of the cam base circle of the camshaft during the first rotation. The delayed angle range may vary depending on the detected temperature of the temperature detector.
[0019] The control unit can send a separation signal to the actuator when the camshaft speed reaches below a set speed and at a set angle, causing the first rocker arm to separate from the second rocker arm and the plunger to reach the second position. The set angle can vary depending on the detected temperature of the temperature detector.
[0020] The specific angle may be within an angle range of a cam lift portion of a first rotation of the camshaft.
[0021] The first movement amount may be greater than the second movement amount.
[0022] The actuator may be fixedly mounted on the cylinder head or the cylinder head cover.
[0023] The above summary and the following detailed description are exemplary in nature and are intended to further illustrate the scope of the patent application of the present utility model. Other purposes and advantages of the present utility model will be described in the subsequent specific implementation methods and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 The figure is a perspective view of a conventional variable valve lift engine.
[0025] Figure 2 The figure is an exploded view of an existing variable valve lift engine.
[0026] Figure 3 The present invention is a cross-sectional view of a cylinder head of a conventional variable valve lift engine with a first rocker arm and a second rocker arm in a connected state.
[0027] Figure 4 The invention is a cross-sectional view of a cylinder head of a conventional variable valve lift engine with a first rocker arm and a second rocker arm in a separated state.
[0028] Figure 5 It is a three-dimensional diagram of an engine with variable valve lift according to the first embodiment of the utility model.
[0029] Figure 6 This is an exploded view of an engine with variable valve lift according to the first embodiment of the utility model.
[0030] Figure 7 It is a top view of a cylinder head cut through a cylinder head cover according to a first embodiment of the present invention.
[0031] Figure 8 It is a cross-sectional view of a cylinder head according to the first embodiment of the present invention.
[0032] Fig. 9 It is a three-dimensional diagram of the intake rocker arm group and the camshaft assembly of the first embodiment of the utility model.
[0033] Fig.10 for Fig. 9 Side view of.
[0034] Fig.11A This is a cross-sectional view of a cylinder head after the connecting pin of the first embodiment of the utility model completes a first movement amount.
[0035] Fig. 11B for Fig.11A A partial enlarged view of .
[0036] Fig. 12A This is a cross-sectional view of the cylinder head when the connecting pin of the first embodiment of the utility model completes the second movement and the plunger reaches the first position.
[0037] Fig. 12B for Fig. 12A A partial enlarged view of .
[0038] Fig.13 This is a relationship diagram of the valve lift, the connection signal and the connection pin movement amount corresponding to the camshaft angle of the first embodiment of the utility model.
[0039] Fig.14 This is a relationship diagram of the actuator driving force corresponding to the plunger displacement of the first embodiment of the utility model.
[0040] Fig.15A This is a cross-sectional view of the cylinder head when the plunger of the first embodiment of the utility model reaches the second position.
[0041] Fig. 15B for Fig.15A A partial enlarged view of .
[0042] Fig.16A This is a cross-sectional view of a cylinder head after the connecting pin of the second embodiment of the utility model completes a first movement amount.
[0043] Fig. 16B for Fig.16A A partial enlarged view of .
[0044] Fig.17A This is a cross-sectional view of a cylinder head when the connecting pin of the second embodiment of the present invention completes the second movement and the plunger reaches the first position.
[0045] Fig. 17B for Fig.17A A partial enlarged view of .
[0046] Fig.18A This is a cross-sectional view of a cylinder head when the plunger of the second embodiment of the present invention reaches the second position.
[0047] Fig.18B for Fig.18A A partial enlarged view of .
[0048] Description of main component symbols:
[0049] 1, 9 Engines
[0050] 2 Crankcase
[0051] 3 Cylinder Block
[0052] 4 Cylinder head
[0053] 41 Cylinder head cover
[0054] 42 Upper joint surface
[0055] 43 Lower joint surface
[0056] 44 Camshaft assembly
[0057] 441 Camshaft
[0058] 441a First intake cam
[0059] 441b Second intake cam
[0060] 4411 Cam base circle
[0061] 4412 Cam lift unit
[0062] 442 Sprocket
[0063] 443 Read disk
[0064] 4431 Bump
[0065] 45 Intake rocker arm assembly
[0066] 452 First rocker arm
[0067] 453 Second rocker arm
[0068] 454 Linking mechanism
[0069] 4541 Putter
[0070] 4542 Connecting pin
[0071] 4543 Return Spring
[0072] 47 Rocker shaft
[0073] 5, 5', 95 Actuator
[0074] 50 Storage Space
[0075] 51 Limiting parts
[0076] 52 Stopper
[0077] 53 Coil
[0078] 54 Spindle
[0079] 55 Plunger
[0080] 6 First sound-reducing member
[0081] 7 Second sound-reducing element
[0082] 81 Speed detector
[0083] 82 Temperature Detector
[0084] 83 Pressure relief mechanism
[0085] 831 Centrifugal Block
[0086] 84 Control Unit
[0087] a The first positioning part
[0088] b Second positioning part
[0089] c The third positioning part
[0090] d Fourth positioning portion
[0091] D1 First movement amount
[0092] D2 Second movement amount
[0093] M1, M2 connecting pin movement curve
[0094] S1, S2 Link signal
[0095] Tc, Th Actuator driving force curve
[0096] P1 First intake valve lift curve
[0097] P2 Second intake valve lift curve
[0098] θ1, θ1', θc Starting angle position
[0099] θs, θs' specific angles
[0100] Δθ1, Δθ1' First angle range
[0101] Δθ2, Δθ2' Second angle range
[0102] Δθa, Δθa' Delay angle range
[0103] Δθc, Δθn angle range. DETAILED DESCRIPTION
[0104] See also Figures 5 to 10 , which are respectively a three-dimensional view of an engine with a variable valve lift according to the first embodiment of the utility model, an exploded view of an engine with a variable valve lift, a top view of a cylinder head cut through a cylinder head cover, a cross-sectional view of a cylinder head, a three-dimensional view of an intake rocker arm assembly and a camshaft assembly, and Fig. 9 The figure shows a variable valve lift engine 1, including: a crankcase 2, a cylinder block 3, a cylinder head 4, a cylinder head cover 41, a camshaft assembly 44, a rocker arm shaft 47, an intake rocker arm group 45, an actuator 5, a speed detector 81, a temperature detector 82, a pressure reducing mechanism 83 and a control unit 84.
[0105] The crankcase 2 includes a crankshaft (not shown). The cylinder block 3 is arranged on the crankcase 2. The cylinder head 4 includes an upper joint surface 42 and a lower joint surface 43. The lower joint surface 43 of the cylinder head 4 is connected to the cylinder block 3. The cylinder head cover 41 is connected to the upper joint surface 42. The camshaft assembly 44 is pivoted on the cylinder head 4, including a camshaft 441, a sprocket 442 and a reading disk 443 with at least one protrusion 4431. The camshaft assembly 44 is driven by the crankshaft to rotate through a chain (not shown). The camshaft 441 includes a first intake cam 441a and a second intake cam 441b. The first intake cam 441a has a cam base circle portion 4411 and a cam lift portion 4412. In the axial direction of the camshaft 441, the reading disk 443 and the first intake cam 441a are respectively arranged on both sides of the sprocket 442. The rocker shaft 47 is supported on the cylinder head 4. The intake rocker arm assembly 45 includes a first rocker arm 452, a second rocker arm 453 and a connecting mechanism 454. The first rocker arm 452 and the second rocker arm 453 are pivotally mounted on the rocker shaft 47 and driven to rotate by the camshaft 441. The connecting mechanism 454 can slide along the axial direction of the rocker shaft 47 to connect or disconnect the first rocker arm 452 and the second rocker arm 453. In this embodiment, the connecting mechanism 454 includes a push rod 4541, a connecting pin 4542 and a return spring 4543, but the present invention is not limited thereto. The connecting mechanism 454 may also include only the connecting pin 4542 and the return spring 4543.
[0106] In this embodiment, the speed detector 81 is assembled on the cylinder head cover 41 to detect the rotation signal of at least one bump 4431 to obtain the speed and angle of the camshaft 441, but the invention is not limited thereto. The speed detector 81 can also be assembled on the cylinder head 4. The actuator 5 provides a driving force to push the connecting mechanism 454 to connect or separate the first rocker arm 452 and the second rocker arm 453. In this embodiment, the actuator 5 is fixedly mounted on the cylinder head cover 41, but the invention is not limited thereto. The actuator 5 can also be fixedly mounted on the cylinder head 4. The actuator 5 includes a limit member 51, a stop member 52, a coil 53, a spindle 54 and a plunger 55. The plunger 55 is accommodated in an accommodating space 50 formed by the limit member 51 and the stop member 52. The spindle 54 is fixedly connected to the plunger 55 so that they are in a linked relationship. The push rod 4541 is arranged between the connecting pin 4542 and the spindle 54. The connecting pin 4542 is pushed against the spindle 54 by the thrust of the return spring 4543, and the spindle 54, the push rod 4541 and the connecting pin 4542 are pushed synchronously by the driving force of the actuator 5 and the thrust of the return spring 4543. When the plunger 55 is close to the limit member 51, the plunger 55 is located at a first position, and when the plunger 55 is close to the stop member 52, the plunger 55 is located at a second position. In this embodiment, the temperature detector 82 is fixedly mounted on the cylinder head 4 to detect the temperature of the engine 1, but the invention is not limited thereto and may also be fixedly mounted on the crankcase 2, the cylinder head cover 41, the actuator 5 or other locations. The decompression mechanism 83 has a centrifugal block 831 pivotally mounted on the sprocket 442. When viewed in the direction perpendicular to the axis of the camshaft 441, the centrifugal block 831 and the reading plate 443 are located on the same side of the sprocket 442, and the centrifugal block 831 is located between the reading plate 443 and the sprocket 442 (e.g. Fig.11A As shown in FIG. 4 , the space occupied by the reading disk 443 on the cam side of the sprocket 442 can be reduced, so as to facilitate the arrangement of the first intake cam 441a, the second intake cam 441b and the intake rocker arm group 45. The control unit 84 is electrically connected to the actuator 5, the speed detector 81 and the temperature of the temperature detector 82 to provide a signal to control the actuator 5 so that the plunger 55 can slide in the accommodating space 50, and the spindle 54 is linked to the connecting mechanism 454 to connect or separate the first rocker arm 452 and the second rocker arm 453.
[0107] See also Fig.11A , Fig. 11B , Fig. 12A , Fig. 12B , Fig.13 and Fig.14 , which are respectively a cross-sectional view of a cylinder head after the connecting pin of the first embodiment of the utility model completes the first movement amount, Fig.11A A partial enlarged view of the cylinder head of the first embodiment of the utility model, in which the connecting pin completes the second movement and the plunger reaches the first position, Fig. 12AA partial enlarged diagram of the valve lift, the connection signal and the connection pin movement amount of the first embodiment of the utility model corresponding to the camshaft angle, and a diagram of the actuator driving force corresponding to the plunger displacement of the first embodiment of the utility model. Fig.11A and Fig. 11B As shown, the side wall of the limiter 51 corresponding to the plunger 55 is a first positioning portion a, the side wall of the plunger 55 corresponding to the limiter 51 is a second positioning portion b, the side wall of the plunger 55 corresponding to the stopper 52 is a third positioning portion c, and the side wall of the stopper 52 corresponding to the plunger 55 is a fourth positioning portion d. Among them, the first sound-reducing member 6 of the utility model is a product including elastic members such as rubber products, reeds or springs, etc., and is arranged on at least one of the first positioning portion a and the second positioning portion b. In this embodiment, the first sound-reducing member 6 is arranged on the first positioning portion a and does not move synchronously with the plunger 55; the second sound-reducing member 7 of the utility model is a product including elastic members such as rubber products, reeds or springs, etc., and is arranged on at least one of the third positioning portion c and the fourth positioning portion d. In this embodiment, the second sound-reducing member 7 is arranged on the third positioning portion c and moves synchronously with the plunger 55. Thus, the first sound-reducing member 6 and the second sound-reducing member 7 are respectively disposed on opposite sides of the plunger 55 in the axial direction, so that when the plunger 55 reaches the first position and the second position, the impact can be buffered to achieve a sound-reducing effect.
[0108] Please also read Fig.13 , which consists of a relationship diagram of valve lift-camshaft angle, a relationship diagram of connection signal-camshaft angle, and a relationship diagram of connection pin movement amount-camshaft angle. The ordinates are valve lift, connection signal, and connection pin movement amount, respectively, and the abscissas are all camshaft angles. The camshaft angles include the camshaft angles during the first rotation of the camshaft and the second rotation of the camshaft, and each rotation of the camshaft includes an angle range Δθn of a cam lift portion 4412 and an angle range Δθc of a cam base circle portion 4411. In the relationship diagram of valve lift-camshaft angle, there is a first intake valve lift curve P1 and a second intake valve lift curve P2. When the first rocker arm 452 and the second rocker arm 453 are in a separated state, they correspond to the first intake valve lift curve P1, and when the first rocker arm 452 and the second rocker arm 453 are in a connected state, they correspond to the second intake valve lift curve P2; in the relationship diagram of connection signal-camshaft angle, there is a connection signal S1 (low temperature) and a connection signal S2 (high temperature); in the relationship diagram of connection pin movement amount-camshaft angle, there is a connection pin movement amount curve M1 (low temperature) and a connection pin movement amount curve M2 (high temperature).
[0109] Please also read Fig.14In the relationship diagram of the actuator driving force corresponding to the plunger displacement, there is an actuator driving force curve Tc (low temperature) and an actuator driving force curve Th (high temperature), which is Fig.14 It can be seen that the actuator 5 is affected by temperature and thus changes the driving force. Generally speaking, the driving force generated by the actuator 5 at a low temperature is greater than the driving force generated by the actuator 5 at a high temperature. Therefore, at different temperatures, the control unit 84 (such as Figure 5 The time point for sending the connection signals S1, S2 and the angular range of displacement of the connection pin 4542 during the first rotation of the camshaft and the second rotation of the camshaft are also different.
[0110] When the temperature detected by the temperature detector 82 is low, the control unit 84 (such as Figure 5 As shown in FIG. 1 , when the rotation speed of the camshaft 441 reaches a specific rotation speed or above, and at a specific angle θs, a connection signal S1 (low temperature) is sent to the actuator 5, and the actuator 5 is in a driving state to drive the connection mechanism 454 to operate in a two-stage process, so that the spindle 54 pushes the connection pin 4542 to complete a first movement amount D1 in a first angle range Δθ1. Among them, the specific angle θs is located in the angle range Δθn of the cam lift portion 4412 of the first rotation of the camshaft, the first angle range Δθ1 is located in the angle range Δθc of the cam base circle portion 4411 of the first rotation of the camshaft, and the starting angle position θ1 of the first angle range Δθ1 is delayed by a delay angle range Δθa than the starting angle position θc of the cam base circle portion 4411 of the first rotation of the camshaft. Therefore, under the drive of the first stage process, the actuator 5 prompts the spindle 54 to push the connecting pin 4542 to complete the first movement amount D1, so that the first rocker arm 452 and the second rocker arm 453 are initially connected. After the initial connection, the second intake cam 441b can press against the second rocker arm 453 to drive the first rocker arm 452 to rotate and open the second intake valve lift curve P2.
[0111] When the temperature detected by the temperature detector 82 is high, the control unit 84 (such as Figure 5(shown in the figure) when the rotation speed of the camshaft 441 reaches a specific rotation speed or above, and at a specific angle θs', a connection signal S2 (high temperature) is sent to the actuator 5, and the actuator 5 is in a driving state to drive the connection mechanism 454 to operate in a two-stage process, so that the spindle 54 pushes the connection pin 4542 to complete a first movement amount D1 in a first angle range Δθ1'. Among them, the specific angle θs' is located in the angle range Δθn of the cam lift portion 4412 of the first rotation of the camshaft, the first angle range Δθ1' is located in the angle range Δθc of the cam base circle portion 4411 of the first rotation of the camshaft, and the starting angle position θ1' of the first angle range Δθ1' is delayed by a delay angle range Δθa' than the starting angle position θc of the cam base circle portion 4411 of the first rotation of the camshaft. Therefore, under the drive of the first stage process, the actuator 5 prompts the spindle 54 to push the connecting pin 4542 to complete the first movement amount D1, so that the first rocker arm 452 and the second rocker arm 453 are initially connected. After the initial connection, the second intake cam 441b can press against the second rocker arm 453 to drive the first rocker arm 452 to rotate and open the second intake valve lift curve P2.
[0112] like Fig. 12A , Fig. 12B , Fig.13 and Fig.14 As shown, when the temperature detected by the temperature detector 82 is low temperature and the camshaft rotates for the second time, the control unit 84 (such as Figure 5 The actuator 5 is driven by the second process to push the connecting pin 4542 to complete the second movement amount D2, so that the first rocker arm 452 and the second rocker arm 453 are connected. When the second movement amount D2 is completed, the plunger 55 reaches the first position, and the first sound-reducing member 6 abuts between the plunger 55 and the stopper 51. The second angle range Δθ2 is located within the angle range Δθc of the cam base circle 4411 of the second rotation of the camshaft, and the first movement amount D1 is greater than the second movement amount D2. Therefore, the actuator 5 is driven by the second process to push the connecting pin 4542 to complete the second movement amount D2, so that the first rocker arm 452 and the second rocker arm 453 are connected, and the second intake cam 441b abuts the second rocker arm 453 to rotate the first rocker arm 452 to open the second intake valve lift curve P2.
[0113] When the temperature detected by the temperature detector 82 is high, and when the camshaft rotates for the second time, the control unit 84 (such as Figure 5The actuator 5 will cause the spindle 54 to push the connecting pin 4542 to complete a second movement amount D2 in a second angle range Δθ2', thereby connecting the first rocker arm 452 and the second rocker arm 453. When the second movement amount D2 is completed, the plunger 55 reaches the first position, and the first sound-reducing member 6 abuts between the plunger 55 and the stopper 51. The second angle range Δθ2' is located within the angle range Δθc of the cam base circle 4411 of the second rotation of the camshaft, and the first movement amount D1 is greater than the second movement amount D2. Therefore, the actuator 5 is driven by the second process to cause the spindle 54 to push the connecting pin 4542 to complete the second movement amount D2, so that the first rocker arm 452 and the second rocker arm 453 are actually connected, and the second intake cam 441b abuts the second rocker arm 453 to link the first rocker arm 452 to rotate and open the second intake valve lift curve P2.
[0114] See also Fig.15A and Fig. 15B , which are respectively a cross-sectional view of the cylinder head when the plunger of the first embodiment of the utility model reaches the second position and Fig.15A As shown in the figure, the control unit 84 (such as Figure 5 As shown in FIG. 1 , when the rotation speed of the camshaft 441 reaches a set rotation speed or less, a separation signal is sent to the actuator 5 at a set angle, causing the first rocker arm 452 to separate from the second rocker arm 453, and the plunger 55 to reach the second position. At this time, the second sound-reducing member 7 abuts between the plunger 55 and the stopper 52. The set angle varies according to the detected temperature of the temperature detector 82. Thus, the control unit 84 (as shown in FIG. 1 ) Figure 5 As shown in the figure, when the separation signal is sent to the actuator 5, the actuator 5 is in a non-driven state. At this time, the elastic restoring force of the return spring 4543 acts to prompt the connecting pin 4542 to push the spindle 54 and allow the plunger 55 to return to the second position, so that the first rocker arm 452 is separated from the second rocker arm 453, and the first intake cam 441a pushes against the first rocker arm 452 to rotate and open the first intake valve lift curve P1.
[0115] See also Fig.16A and Fig. 16B , which are respectively a cross-sectional view of a cylinder head of a connecting pin of a second embodiment of the utility model after completing a first movement amount and Fig.16AAs shown in the figure, the basic structure and actuation principle of the variable valve lift engine of this embodiment are the same as those of the first embodiment, and will not be described here, except that the actuator 5' of this embodiment does not have the first sound-reducing member 6, and the second sound-reducing member 7 is also arranged at the third positioning portion c and moves synchronously with the plunger 55. The following only describes the actuation state of the actuator 5': the actuator 5' is driven in the first stage to cause the spindle 54 to push the connecting pin 4542 to complete the first movement amount D1, so that the first rocker arm 452 and the second rocker arm 453 are initially connected.
[0116] See also Fig.17A and Fig. 17B , which are respectively a cross-sectional view of the cylinder head when the connecting pin of the second embodiment of the utility model completes the second movement and the plunger reaches the first position and Fig.17A As shown in the figure, the actuator 5' is driven by the second stage process to prompt the spindle 54 to push the connecting pin 4542 to complete the second movement amount D2, so that the first rocker arm 452 and the second rocker arm 453 are actually connected. Since the utility model is actuated in a two-stage process and the first movement amount D1 is greater than the second movement amount D2, when the plunger 55 reaches the first position, the volume of the impact noise is effectively reduced, so there is no need to set a sound reduction component on the first positioning portion a or the second positioning portion b.
[0117] See also Fig.18A and Fig.18B , which are respectively a cross-sectional view of the cylinder head when the plunger of the second embodiment of the utility model reaches the second position and Fig.18A As shown in the figure, when the control unit sends a separation signal to the actuator 5', the actuator 5' is in a non-driven state. At this time, the elastic restoring force of the return spring 4543 acts to prompt the connecting pin 4542 to push the spindle 54 and return the plunger 55 to the second position, so that the first rocker arm 452 is separated from the second rocker arm 453. Among them, the second sound-reducing component 7 abuts between the plunger 55 and the stopper 52, effectively improving or reducing the volume of abnormal sound.
[0118] Through the above two designs, a speed detector and a reading disk are added to the existing variable valve lift engine to obtain the speed and angle of the camshaft, so that the actuator drives the connecting mechanism to operate in a two-stage process, and the connecting pin is caused to operate in stages for the first movement amount and the second movement amount, thereby connecting the first rocker arm and the second rocker arm. In addition, a temperature detector is added to the existing variable valve lift engine. Since the actuator is affected by the temperature rise and the driving force changes, the sending time of the connection signal of the control unit can be adjusted according to the different detection temperatures provided by the temperature detector to avoid the generation of impact noise inside the actuator, and effectively improve or reduce the volume of the noise.
[0119] The above embodiments are merely examples for the convenience of explanation. The scope of rights claimed by the present utility model shall be based on the scope of protection required by the patent application documents, and is not limited to the above embodiments.
Claims
1. An engine with variable valve lift, characterized in that: Included are: A crankcase, which contains a crankshaft; a cylinder block disposed on the crankcase; A cylinder head, comprising an upper joint surface and a lower joint surface, wherein the cylinder head is joined to the cylinder body via the lower joint surface; a cylinder head cover, coupled to the upper coupling surface; A camshaft assembly is pivotally mounted on the cylinder head, comprising a camshaft, a sprocket and a reading plate with at least one protrusion. The camshaft assembly is driven by the crankshaft to rotate through a chain. The camshaft comprises a first intake cam and a second intake cam. The first intake cam has a cam base circle portion and a cam lift portion. In the axial direction of the camshaft, the reading plate and the first intake cam are respectively arranged on both sides of the sprocket; a rocker shaft supported on the cylinder head; An intake rocker arm assembly, comprising a first rocker arm, a second rocker arm and a connecting mechanism, wherein the first rocker arm and the second rocker arm are pivotally mounted on the rocker arm shaft and driven by the camshaft to rotate, and the connecting mechanism can slide along the axis direction of the rocker arm shaft to connect or separate the first rocker arm and the second rocker arm, and the connecting mechanism comprises a connecting pin and a return spring; A rotation speed detector, mounted on the cylinder head cover or the cylinder head, for detecting a rotation signal of the at least one bump to obtain a rotation speed and an angle of the camshaft; An actuator, providing a driving force to push the connecting mechanism, so as to connect or separate the first rocker arm and the second rocker arm, the actuator comprising a limiter, a stopper, a coil, a spindle and a plunger, the plunger is accommodated in a receiving space formed by the limiter and the stopper, the spindle is fixedly connected to the plunger so as to form a linkage relationship, the connecting pin is pushed against the spindle by the pushing force of the return spring, and is pushed and moved synchronously by the driving force of the actuator, when the plunger is close to the limiter, the plunger is located at a first position, and when the plunger is close to the stopper, the plunger is located at a second position; as well as a control unit electrically connected to the actuator and the rotation speed detector for providing a signal to control the actuator so that the plunger can slide in the accommodating space and the spindle is linked to the connecting mechanism to cause the first rocker arm to be connected or separated from the second rocker arm; Among them, the control unit sends a connection signal to the actuator when the rotation speed of the camshaft reaches above a specific rotation speed and at a specific angle, so as to prompt the spindle to push the connecting pin to complete a first movement within a first angle range, and prompt the spindle to push the connecting pin to complete a second movement within a second angle range, thereby connecting the first rocker arm with the second rocker arm, and the plunger reaches the first position when the second movement is completed.
2. The variable valve lift engine according to claim 1, characterized in that: The first angle range is within the angle range of the cam base circle portion of the camshaft during the first rotation, the second angle range is within the angle range of the cam base circle portion of the camshaft during the second rotation, and the starting angle position of the first angle range is delayed by a delayed angle range than the starting angle position of the cam base circle portion of the camshaft during the first rotation.
3. The variable valve lift engine according to claim 1, characterized in that: The control unit sends a separation signal to the actuator when the rotation speed of the camshaft reaches below a set rotation speed and at a set angle, so as to cause the first rocker arm to separate from the second rocker arm and the plunger to reach the second position.
4. An engine with variable valve lift, characterized in that: Included are: A crankcase, which contains a crankshaft; a cylinder block disposed on the crankcase; A cylinder head, comprising an upper joint surface and a lower joint surface, wherein the cylinder head is joined to the cylinder body via the lower joint surface; a cylinder head cover, coupled to the upper coupling surface; A camshaft assembly is pivotally mounted on the cylinder head, comprising a camshaft, a sprocket and a reading plate with at least one protrusion. The camshaft assembly is driven by the crankshaft to rotate through a chain. The camshaft comprises a first intake cam and a second intake cam. The first intake cam has a cam base circle portion and a cam lift portion. In the axial direction of the camshaft, the reading plate and the first intake cam are respectively arranged on both sides of the sprocket; a rocker shaft supported on the cylinder head; An intake rocker arm assembly, comprising a first rocker arm, a second rocker arm and a connecting mechanism, wherein the first rocker arm and the second rocker arm are pivotally mounted on the rocker arm shaft and driven by the camshaft to rotate, and the connecting mechanism can slide along the axis direction of the rocker arm shaft to connect or separate the first rocker arm and the second rocker arm, and the connecting mechanism comprises a connecting pin and a return spring; A rotation speed detector, mounted on the cylinder head cover or the cylinder head, for detecting a rotation signal of the at least one bump to obtain a rotation speed and an angle of the camshaft; An actuator, providing a driving force to push the connecting mechanism, so as to connect or separate the first rocker arm and the second rocker arm, the actuator comprising a limiter, a stopper, a coil, a spindle and a plunger, the plunger is accommodated in a receiving space formed by the limiter and the stopper, the spindle is fixedly connected to the plunger so as to form a linkage relationship, the connecting pin is pushed against the spindle by the pushing force of the return spring, and is pushed and moved synchronously by the driving force of the actuator, when the plunger is close to the limiter, the plunger is located at a first position, and when the plunger is close to the stopper, the plunger is located at a second position; a temperature detector, fixedly mounted on the crankcase, the cylinder head, the cylinder head cover or the actuator, for detecting the temperature of the engine; as well as a control unit electrically connected to the actuator, the rotation speed detector and reading the temperature of the temperature detector, for providing a signal to control the actuator so that the plunger can slide in the accommodating space and the spindle is linked to the connecting mechanism to cause the first rocker arm to be connected or separated from the second rocker arm; Among them, the control unit sends a connection signal to the actuator when the rotation speed of the camshaft reaches above a specific rotation speed and at a specific angle, so as to prompt the spindle to push the connecting pin to complete a first movement within a first angle range, and prompt the spindle to push the connecting pin to complete a second movement within a second angle range, thereby connecting the first rocker arm with the second rocker arm. When the second movement is completed, the plunger reaches the first position. The specific angle and the first angle range vary according to the detection temperature of the temperature detector.
5. The variable valve lift engine according to claim 4, characterized in that: The first angle range is located within the angle range of the cam base circle portion of the camshaft during the first rotation, and the second angle range is located within the angle range of the cam base circle portion of the camshaft during the second rotation. The starting angle position of the first angle range is delayed by a delayed angle range than the starting angle position of the cam base circle portion of the camshaft during the first rotation, and the delayed angle range varies according to different detected temperatures of the temperature detector.
6. The variable valve lift engine according to claim 4, characterized in that: The control unit sends a separation signal to the actuator when the rotation speed of the camshaft reaches below a set rotation speed and at a set angle, causing the first rocker arm to separate from the second rocker arm and the plunger to reach the second position. The set angle varies according to the detected temperature of the temperature detector.
7. The variable valve lift engine according to claim 1 or claim 4, characterized in that: The specific angle is located within the angular range of the cam lift portion of the camshaft during the first rotation.
8. The variable valve lift engine according to claim 1 or claim 4, characterized in that: The first movement amount is greater than the second movement amount.
9. The variable valve lift engine according to claim 1 or claim 4, characterized in that: The actuator is fixed to the cylinder head or the cylinder head cover.