Engine with variable valve lift mechanism

Abstract

The utility model relates to an engine with a variable valve lift mechanism. The engine comprises a crankcase, a cylinder body, a cylinder head, a cam shaft, a rocker arm shaft, an air inlet rocker arm set, a torsion spring, an actuator and a control unit. The air inlet rocker arm set comprises a first rocker arm, a second rocker arm and a connecting mechanism, the torsion spring comprises a spiral section, a first extension arm and a second extension arm, and the spiral section is arranged on the rocker arm shaft and is coaxial with the first rocker arm and the second rocker arm. The engine further comprises a pressing plate, the pressing plate comprises an abutting portion with a through hole, a locking portion and an abutting portion, the through hole is assembled on the rocker arm shaft and is coaxial with the first rocker arm and the second rocker arm, the first extension arm abuts against the second rocker arm, the second extension arm abuts against the abutting portion, and the pressing plate is fixed to the cylinder head through the locking portion. Therefore, through the design, the torsion spring can be assembled on the rocker arm shaft by personnel before any prestressing force is applied, the engine which is easier to assemble and simplifies rocker arm processing and manufacturing is provided, and the engine is actually an optimized design.

Description

Technical Field

[0001] The utility model relates to an engine with a variable valve lift mechanism, in particular to an engine with a variable valve lift mechanism suitable for power vehicles. Background Art

[0002] Figures 1 to 3 The figures are respectively a top view of a cylinder head of an engine with a variable valve lift mechanism, a cross-sectional view of a cylinder head and a head cover, and a cross-sectional view of a support arm and a force member. The figure shows an engine with a variable valve lift mechanism of the prior art, such as the patent case of Taiwan Patent Publication No. I582302, wherein a first rocker arm 936 is supported on a rocking shaft 933, a roller 9363 at one end of the first rocker arm 936 abuts against a camshaft 914, an adjustment screw 9367 at the other end abuts against a valve 927 and is configured to actuate the valve 927, and a second rocker arm 937 is supported on the rocking shaft 933 and arranged side by side with the first rocker arm 936 in the direction of the axis C2' of the camshaft 914. The switching pin member 935 can move along the axis C2' direction of the camshaft 914, and is configured to be movable to a connection position of the first rocker arm 936 and the second rocker arm 937, and to a separation position of the first rocker arm 936 and the second rocker arm 937.

[0003] The prior art includes a force member 938, which applies force in the direction of making the second rocker arm 937 abut against the camshaft 914, and the two ends of the force member 938 are respectively supported by the first support member 941 provided on the second rocker arm 937 and the second support member 942 composed of a plate. When assembling, the second support member 942 must be supported on the section 9619 of the second support wall 9613, and the force member 938, the second rocker arm 937, and the first rocker arm 936 are placed at the same time, and the rocking shaft 933 is inserted after overcoming the pre-stress state.

[0004] The above-mentioned prior art is not easy to assemble, and the second rocker arm 937 is provided with a pin-shaped first support member 941, which requires machining a hole in the second rocker arm 937 and pressing the first support member 941 into a tight fit, thus making the rocker arm processing and manufacturing more complicated.

[0005] The inventor, in view of this, based on the spirit of active invention, has been eager to think of an engine with a variable valve lift mechanism that can solve the above-mentioned problems. After several studies and experiments, the present utility model is finally completed. Utility Model Content

[0006] The main purpose of the utility model is to provide an engine with a variable valve lift mechanism. By adding a pressure plate, it is helpful for personnel to assemble the torsion spring on the rocker arm shaft before applying any preload, thereby providing an engine that is easier to assemble and simplifies the processing and manufacturing of the rocker arm, which is actually an optimized design.

[0007] To achieve the above-mentioned purpose, the engine with a variable valve lift mechanism of the utility model includes a crankcase, a cylinder block, a cylinder head, a camshaft, a rocker shaft, an intake rocker arm group, a torsion spring, an actuator and a control unit. 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 connected to the cylinder block. The camshaft is pivoted on the cylinder head, and the rocker shaft is supported on the cylinder head. The intake rocker arm group includes a first rocker arm, a second rocker arm with a positioning portion and a connecting mechanism. The first rocker arm and the second rocker arm are pivoted on the rocker arm shaft and rotated by the drive of the camshaft. The connecting mechanism can slide along the axial direction of the rocker arm shaft to connect or separate the first rocker arm and the second rocker arm. The torsion spring includes a spiral section, a first extension arm and a second extension arm. The spiral section group is arranged on the rocker arm shaft and is coaxially arranged with the first rocker arm and the second rocker arm. The actuator provides a driving force to push the connecting mechanism, so as to connect or separate the first rocker arm and the second rocker arm. The control unit is electrically connected to the actuator and provides a signal to control the actuator.

[0008] The engine further includes a pressure plate, which includes an adjacent portion with a through hole, a locking portion and a pressing portion. The through hole is arranged on the rocker arm shaft and is coaxially arranged with the first rocker arm and the second rocker arm. The first extension arm abuts against the positioning portion of the second rocker arm, and the second extension arm abuts against the pressing portion. The pressure plate is fixed to the cylinder head by the locking portion. When viewed from the direction of the intersecting axis that is perpendicular to the axis of the camshaft and the axis of the cylinder body, the pressing portion and the second extension arm are located above the rocker arm shaft.

[0009] After the rocker arm shaft passes through the first rocker arm, the second rocker arm, the torsion spring and the pressure plate, the pressure plate can be rotated within a specific angle range to be fixed to the cylinder head with the locking portion, so that the torsion spring provides a specific preload to push the second rocker arm against the camshaft. Therefore, when the first rocker arm, the second rocker arm, the torsion spring and the pressure plate are assembled on the rocker arm shaft, the torsion spring can be in a free state without providing a preload; after the rocker arm shaft is assembled, the pressure plate is rotated within a specific angle range to provide a preload, so it can be assembled more easily than the prior art.

[0010] The second rocker arm may further include an axial extension portion having an inner hole and a rocker arm body, wherein the axial extension portion passes through the spiral section and the through hole, and the rocker arm shaft passes through the inner hole.

[0011] In the above engine, when viewed from a direction perpendicular to the axis of the rocker arm shaft, the spiral section may be located between the adjacent portion and the rocker arm body.

[0012] In the above engine, when viewed from a direction perpendicular to the axis of the rocker arm shaft, the first rocker arm and the second rocker arm may be located between the spiral section and the actuator.

[0013] In the above engine, when viewed from an axial direction perpendicular to the rocker arm shaft, the first rocker arm and the rocker arm body may be located between the spiral section and the actuator.

[0014] The locking portion may further include at least one locking hole, and a locking bolt is respectively passed through the at least one locking hole to fix the pressure plate to the cylinder head.

[0015] In the above engine, when viewed from the axial direction of the cylinder body, the pressing portion and the second extension arm may partially overlap.

[0016] The positioning portion and the second rocker arm can be integrally formed, thereby simplifying the processing and manufacturing of the rocker arm compared to the prior art.

[0017] The above-mentioned connecting mechanism may further include a push rod, a connecting pin and a return spring. The push rod is assembled on the cylinder head, and the connecting pin is assembled on the first rocker arm or the second rocker arm. The return spring presses against the connecting pin and the first rocker arm. The push rod and the connecting pin can slide along the axial direction of the rocker arm shaft. The connecting pin is used to connect or separate the first rocker arm and the second rocker arm.

[0018] The engine may further include a cylinder head cover with a mounting seat surface, the cylinder head cover is locked to the upper joint surface, and the actuator assembly is arranged on the mounting seat surface.

[0019] 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

[0020] Figure 1 The figure is a top view of a cylinder head of an engine with a conventional variable valve lift mechanism.

[0021] Figure 2 The present invention is a cross-sectional view of a cylinder head and a head cover of an engine with a conventional variable valve lift mechanism.

[0022] Figure 3 The invention is a cross-sectional view of a support arm and a force applying member of an engine with a conventional variable valve lift mechanism.

[0023] Figure 4 It is a three-dimensional diagram of an engine with a variable valve lift mechanism according to a preferred embodiment of the utility model.

[0024] Figure 5 This is an exploded view of an engine with a variable valve lift mechanism according to a preferred embodiment of the utility model.

[0025] Figure 6 The top view of a cylinder head according to a preferred embodiment of the utility model is shown in FIG.

[0026] Figure 7It is a cross-sectional view of a cylinder head according to a preferred embodiment of the utility model.

[0027] Figure 8 This is a three-dimensional exploded view of an intake rocker arm assembly, a torsion spring and a pressure plate according to a preferred embodiment of the utility model.

[0028] Fig. 9 This is a three-dimensional diagram of a preferred embodiment of the present invention, showing a pressing plate before positioning.

[0029] Fig.10 This is a three-dimensional diagram of a preferred embodiment of the utility model showing a pressing plate in a positioned state.

[0030] Description of main component symbols:

[0031] 1 Engine

[0032] 2 Crankcase

[0033] 3 Cylinder Block

[0034] 4 Cylinder head

[0035] 42 Upper joint surface

[0036] 43 Lower joint surface

[0037] 44 Camshaft

[0038] 45 Intake rocker arm assembly

[0039] 452 First rocker arm

[0040] 453 Second rocker arm

[0041] 4530 inner hole

[0042] 4531 Axial extension

[0043] 4532 rocker arm body

[0044] 4533 Positioning Department

[0045] 454 Linking mechanism

[0046] 4541 Ejector

[0047] 4542 Connecting pin

[0048] 4543 Return Spring

[0049] 47 Rocker shaft

[0050] 5 Torsion spring

[0051] 51 Helical segment

[0052] 52 First extension arm

[0053] 53 Second extension arm

[0054] 6 Pressure plate

[0055] 60 Through hole

[0056] 61 Adjacent part

[0057] 62 Locking part

[0058] 620 Locking Bolt

[0059] 621 Locking hole

[0060] 63 Pressing part

[0061] 7 Actuator

[0062] 70 Control unit

[0063] 8 Cylinder head cover

[0064] 80 Mounting seat

[0065] 914 Camshaft

[0066] 927 Valve

[0067] 933 Swing Axis

[0068] 935 Switch pin assembly

[0069] 936 First rocker arm

[0070] 9363 Roller

[0071] 9367 Adjusting screw

[0072] 937 Second rocker arm

[0073] 938 Force-applying member

[0074] 941 first supporting member

[0075] 942 second supporting member

[0076] 9613 Second support wall

[0077] 9619 Section

[0078] C1, C2, C2', C3 axis DETAILED DESCRIPTION

[0079] Figures 4 to 8The figures are respectively a stereoscopic view, an exploded view, a top view of a cylinder head, a cross-sectional view of a cylinder head, and a stereoscopic exploded view of an intake rocker arm assembly, a torsion spring, and a pressure plate of an engine with a variable valve lift mechanism according to a preferred embodiment of the utility model. The figure shows an engine 1 with a variable valve lift mechanism, which mainly includes a crankcase 2, a cylinder block 3, a cylinder head 4, a camshaft 44, a rocker arm shaft 47, an intake rocker arm assembly 45, a torsion spring 5, a pressure plate 6, an actuator 7, a control unit 70, and a cylinder head cover 8. The cylinder block 3 is arranged on the crankcase 2, and the cylinder head 4 includes an upper joint surface 42 and a lower joint surface 43, and the lower joint surface 43 of the cylinder head 4 is combined with the cylinder block 3. The camshaft 44 is pivotally arranged on the cylinder head 4, and the rocker arm shaft 47 is supported on the cylinder head 4.

[0080] The intake rocker arm group 45 includes a first rocker arm 452, a second rocker arm 453 and a connecting mechanism 454. The first rocker arm 452 is pivoted on the rocker arm shaft 47 and is rotated by the drive of the camshaft 44. In the present embodiment, the second rocker arm 453 includes an axial extension portion 4531 having an inner hole 4530 and a rocker arm body 4532 having a positioning portion 4533. The rocker arm shaft 47 passes through the inner hole 4530, so that the second rocker arm 453 is pivoted on the rocker arm shaft 47 and is rotated by the drive of the camshaft 44. The connecting mechanism 454 includes a push rod 4541, a connecting pin 4542 and a return spring 4543. The push rod 4541 is assembled on the cylinder head 4, the connecting pin 4542 is assembled on the first rocker arm 452 or the second rocker arm 453, the return spring 4543 abuts against the connecting pin 4542 and the first rocker arm 452, the push rod 4541 and the connecting pin 4542 can slide along the axis C1 direction of the rocker arm shaft 47, and the connecting pin 4542 is used to connect or separate the first rocker arm 452 and the second rocker arm 453. The torsion spring 5 includes a coil section 51, a first extension arm 52 and a second extension arm 53. The coil section 51 is sleeved on the axial extension portion 4531 of the second rocker arm 453 and then assembled on the rocker arm shaft 47 and is coaxially arranged with the first rocker arm 452 and the second rocker arm 453. The pressure plate 6 includes an adjacent portion 61 having a through hole 60, a locking portion 62 and a pressing portion 63. The through hole 60 is sleeved on the axial extension portion 4531 of the second rocker arm 453 and then assembled on the rocker arm shaft 47 and coaxially arranged with the first rocker arm 452 and the second rocker arm 453. The first extension arm 52 abuts against the positioning portion 4533 of the second rocker arm 453, and the second extension arm 53 abuts against the pressing portion 63. The pressure plate 6 is fixed to the cylinder head 4 by the locking portion 62. The positioning portion 4533 of the second rocker arm 453 is integrally formed with the rocker arm body 4532. The cylinder head cover 8 is locked to the upper joint surface 42 of the cylinder head 4 and has a mounting seat surface 80. The actuator 7 is assembled on the mounting seat surface 80, providing a driving force to push the connecting mechanism 454 to connect or separate the first rocker arm 452 and the second rocker arm 453, but the present invention is not limited thereto, and the actuator 7 can also be assembled on the cylinder head 4. The control unit 70 is electrically connected to the actuator 7, and provides a signal to control the actuator 7.

[0081] like Figure 6 and Figure 7 As shown, when viewed from the axis C3 of the cylinder block 3 , that is, from the Z direction of the drawing, the pressing portion 63 partially overlaps with the second extending arm 53 .

[0082] like Figure 7 As shown, when viewed from the intersecting axis direction which is perpendicular to both the axis C2 of the camshaft 44 and the axis C3 of the cylinder block 3 , that is, when viewed from the Y direction of the drawing, the pressing portion 63 and the second extension arm 53 are located above the rocker arm shaft 47 .

[0083] like Figure 6 and Figure 7 As shown, when observed from a direction perpendicular to the axis C1 of the rocker shaft 47, that is, from the Y direction or Z direction of the drawing, the spiral section 51 is located between the adjacent portion 61 and the rocker body 4532; when observed from a direction perpendicular to the axis C1 of the rocker shaft 47, the first rocker arm 452 and the second rocker arm 453 are located between the spiral section 51 and the actuator 7; when observed from a direction perpendicular to the axis C1 of the rocker shaft 47, the first rocker arm 452 and the rocker body 4532 are located between the spiral section 51 and the actuator 7.

[0084] Fig. 9 This is a stereoscopic diagram of a preferred embodiment of the present invention before the pressure plate is positioned. As shown in the figure, when the first rocker arm 452, the second rocker arm 453, the torsion spring 5 and the pressure plate 6 are to be assembled on the rocker arm shaft 47, the torsion spring 5 can be in a free state without providing a pre-force. At this time, since there is no interference from the spring pre-force, personnel can easily assemble, thereby improving the convenience of assembly.

[0085] Fig.10 This is a three-dimensional diagram of a preferred embodiment of the present invention after the pressure plate is positioned. As shown in the figure, after the rocker shaft 47 passes through the first rocker arm 452, the second rocker arm 453, the torsion spring 5 and the pressure plate 6, the pressure plate 6 is rotated within a specific angle range to be fixed to the cylinder head 4 with the locking portion 62, so that the torsion spring 5 provides a specific preload to push the second rocker arm 453 against the camshaft 44. In this embodiment, the locking portion 62 includes two locking holes 621, and each of the locking holes 621 is respectively penetrated with a locking bolt 620 to fix the pressure plate 6 to the cylinder head 4.

[0086] 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 a variable valve lift mechanism, comprising: a crankcase; 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 camshaft pivotally mounted on the cylinder head; a rocker shaft supported on the cylinder head; An intake rocker arm assembly, comprising a first rocker arm, a second rocker arm having a positioning portion, 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 axial direction of the rocker arm shaft to connect or separate the first rocker arm and the second rocker arm; A torsion spring, comprising a coil section, a first extension arm and a second extension arm, wherein the coil section is assembled on the rocker arm shaft and is coaxially arranged with the first rocker arm and the second rocker arm; an actuator, providing a driving force to push the connecting mechanism, causing the first rocker arm to connect or separate with the second rocker arm; and a control unit, electrically connected to the actuator, and providing a signal to control the actuator; Features: The engine further includes a pressure plate, which includes an adjacent portion with a through hole, a locking portion and a pressing portion. The through hole is arranged on the rocker arm shaft and is coaxially arranged with the first rocker arm and the second rocker arm. The first extension arm abuts against the positioning portion, and the second extension arm abuts against the pressing portion. The pressure plate is fixed to the cylinder head by the locking portion. When observed from the direction of the intersecting axis that is perpendicular to the axis of the camshaft and the axis of the cylinder body, the pressing portion and the second extension arm are located above the rocker arm shaft.

2. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: After the rocker arm shaft passes through the first rocker arm, the second rocker arm, the torsion spring and the pressure plate, the pressure plate will rotate within a specific angle range to be fixed to the cylinder head with the locking portion, so that the torsion spring provides a specific preload to push the second rocker arm against the camshaft.

3. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: The second rocker arm further includes an axial extension portion having an inner hole and a rocker arm body. The axial extension portion passes through the spiral section and the through hole, and the rocker arm shaft passes through the inner hole.

4. The engine with a variable valve lift mechanism as claimed in claim 3, characterized in that: Observed from a direction perpendicular to the axis of the rocker arm shaft, the spiral section is located between the adjacent portion and the rocker arm body.

5. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: When viewed from a direction perpendicular to the axis of the rocker arm shaft, the first rocker arm and the second rocker arm are located between the spiral section and the actuator.

6. The engine with a variable valve lift mechanism as claimed in claim 3, characterized in that: When viewed from an axial direction perpendicular to the rocker arm shaft, the first rocker arm and the rocker arm body are located between the spiral section and the actuator.

7. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: The locking portion further includes at least one locking hole, and a locking bolt is respectively passed through the at least one locking hole to fix the pressing plate to the cylinder head.

8. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: When viewed from the axial direction of the cylinder body, the pressing portion overlaps with a portion of the second extending arm.

9. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: The positioning portion and the second rocker arm are integrally formed.

10. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: The connecting mechanism further includes a push rod, a connecting pin and a return spring. The push rod is assembled on the cylinder head, the connecting pin is assembled on the first rocker arm or the second rocker arm, the return spring presses against the connecting pin and the first rocker arm, the push rod and the connecting pin can slide along the axial direction of the rocker arm shaft, and the connecting pin is used to connect or separate the first rocker arm and the second rocker arm.

11. The engine with a variable valve lift mechanism as claimed in claim 1, characterized in that: The engine further includes a cylinder head cover having a mounting seat surface, the cylinder head cover being locked to the upper joint surface, The actuator assembly is arranged on the mounting seat surface.

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