Cylinder head assembly structure and engine comprising same and provided with variable valve lift mechanism

Abstract

The utility model relates to a cylinder head assembly structure and an engine comprising the same and provided with a variable valve lift mechanism. The cylinder head assembly structure comprises a cylinder head, a cam shaft assembly, a cylinder head cover and a cooling water pump. The cylinder head comprises a first outer wall portion, a second outer wall portion, an upper combination face and a lower combination face, the upper combination face and the lower combination face are not parallel and form an included angle, and the lower combination face of the cylinder head is combined with a cylinder body. The first outer wall portion is adjacent to the sprocket, the first outer wall portion and the second outer wall portion are respectively located on opposite sides of the camshaft assembly in an axial direction of the camshaft, the upper junction surface overlaps the camshaft when viewed from a direction perpendicular to an axis of the camshaft and an axis of the cylinder block simultaneously, and the first outer wall portion is lower than the second outer wall portion. And the first outer wall part is lower than the cam shaft. Therefore, the cylinder head assembly structure provided by the utility model is lower in cost, smaller in size and more favorable for assembly.

Description

Technical Field

[0001] This utility model relates to a cylinder head assembly structure and an engine with a variable valve lift mechanism including the structure, and more particularly to a cylinder head assembly structure suitable for power vehicles and an engine with a variable valve lift mechanism including the structure. Background Technology

[0002] Please see Figure 1 and Figure 2 These are cross-sectional and top views of an existing engine with a variable valve lift mechanism, respectively. As shown in the figure, the cylinder head 90 of the engine 9 with a variable valve lift mechanism disclosed in the prior art, such as the Taiwan Patent Publication No. M650959, is configured such that the connecting mechanism 91 includes a push rod 911, a connecting pin 912, and a return spring 913. The push rod 911 is assembled on the cylinder head 90, and the connecting pin 912 and the return spring 913 are assembled on the first rocker arm 901. The return spring 913 provides a preload to cause the connecting pin 912 to abut against the push rod 911, and the push rod 911 and the connecting pin 912 can slide along the axial direction of the rocker arm shaft 903. The push rod 911 abuts against the actuator 97 and the connecting pin 912. The actuator 97 may or may not provide a driving force, causing the push rod 911 to push or not push the connecting pin 912, thereby connecting or separating the first rocker arm 901 and the second rocker arm 902. Since the actuator 97 is assembled on the cylinder head cover 92, an inspection window 94 facing the inspection notch 93 and an inspection window cover 95 are provided on the cylinder head cover 92 to observe the position of the end face of the connecting pin 912 relative to the inspection notch 93. This allows personnel to directly determine whether the component configuration is correct through the inspection window 94, improving the convenience of assembly or maintenance. However, since the inspection window 94 requires machining a mating surface 96 and the inspection window cover 95, the cost is relatively high. Furthermore, the support wall 98 of the push rod 911 is separated from the wall 99 of the mounting hole 971 of the cylinder head cover 92 by a certain distance, which is not conducive to the miniaturization of the cylinder head 90.

[0003] Please see Figure 3The figure shows a cross-sectional view of another existing engine with a variable valve lift mechanism. As shown, the prior art, such as the cylinder head 90' of the engine 9' with a variable valve lift mechanism disclosed in Taiwan Patent Application No. 113200197, includes a connecting mechanism 91' comprising a push rod 911', a connecting pin 912', and a return spring 913'. The operating principle of the connecting mechanism 91' can be found in the description of the aforementioned patent application M650959, and will not be repeated here. Furthermore, the camshaft assembly 93' is pivotally mounted on the cylinder head 90', including a camshaft 931', a sprocket 932', a decompression mechanism 94', and a readout disk 933'. A speed sensor 95' is mounted on the cylinder head cover 92'. The camshaft assembly 93' is rotated by the crankshaft via a chain (not shown). The decompression mechanism 94' has a centrifugal block 941' pivotally mounted on the sprocket 932'. Viewed perpendicular to the axis of the camshaft 931', the centrifugal block 941' and the readout disk 933' are located on the same side of the sprocket 932', and the centrifugal block 941' is located between the readout disk 933' and the sprocket 932'. Figure 3 As shown, because the cooling water pump 98' is located on the cylinder head 90', the upper mating surface 96' of the cylinder head 90' is higher than the camshaft 931', causing the parts and chain of the camshaft assembly 93' to be affected by the wall 97' of the cylinder head 90', resulting in poor assembly workability.

[0004] Driven by this, and with a spirit of active creation, the inventor sought a cylinder head assembly structure that could solve the above problems, as well as an engine with a variable valve lift mechanism including the cylinder head assembly. After several research and experiments, the inventor finally completed this utility model. Utility Model Content

[0005] The main objective of this invention is to provide a cylinder head assembly structure that effectively improves upon the problems encountered in the prior art described above, and provides a cylinder head assembly structure that is lower in cost, smaller in size, and easier to assemble.

[0006] To achieve the above objectives, the cylinder head assembly structure of this utility model includes a cylinder head, a camshaft assembly, a cylinder head cover, and a cooling water pump.

[0007] The cylinder head includes a first outer wall portion, a second outer wall portion, an upper mating surface, and a lower mating surface. The upper and lower mating surfaces are not parallel and form an angle. The lower mating surface of the cylinder head is engaged with a cylinder block. A camshaft assembly is pivotally mounted on the cylinder head and includes a camshaft and a sprocket. The camshaft assembly is connected to a crankshaft via a chain. The first outer wall portion is adjacent to the sprocket. In the axial direction of the camshaft, the first and second outer wall portions are located on opposite sides of the camshaft assembly. Viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder block, the upper mating surface overlaps with the camshaft. The first outer wall portion is lower than the second outer wall portion, and the first outer wall portion is even lower than the camshaft. The cylinder head cover includes a cover mounting surface and a side wall. The cover mounting surface is locked to the upper mating surface, and the side wall corresponds to the first outer wall portion. A cooling water pump assembly has a water pump mounting hole opened in the side wall and has a rotating spindle that rotates synchronously with the camshaft assembly.

[0008] Another objective of this invention is to provide an engine with a variable valve lift mechanism. By using the above-mentioned cylinder head assembly structural design and applying it to an engine with a variable valve lift mechanism, the problems encountered in the prior art can be effectively improved, and a lower-cost, smaller, and more assembleable engine with a variable valve lift mechanism can be provided.

[0009] To achieve the above objectives, the engine with a variable valve lift mechanism of this utility model includes a crankcase, a cylinder block, a cylinder head assembly, a rocker arm shaft, an intake rocker arm assembly, a first locking bolt, a second locking bolt, an actuator, and a control unit. A crankshaft is pivotally mounted inside the crankcase. The cylinder block is mounted on the crankcase. The cylinder head assembly includes a cylinder head, a camshaft assembly, a cylinder head cover, and a cooling water pump. The cylinder head includes a first outer wall portion, a second outer wall portion, an upper mating surface, and a lower mating surface. The upper and lower mating surfaces are not parallel and form an angle. The lower mating surface of the cylinder head is engaged with the cylinder block. A camshaft assembly is pivotally mounted on the cylinder head and includes a camshaft and a sprocket. The camshaft assembly is connected to the crankshaft via a chain. A first outer wall portion is adjacent to the sprocket. In the axial direction of the camshaft, the first outer wall portion and the second outer wall portion are located on opposite sides of the camshaft assembly. Viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder block, the upper mating surface overlaps with the camshaft. The first outer wall portion is lower than the second outer wall portion, and the first outer wall portion is even lower than the camshaft. A first locking bolt is adjacent to the sprocket and secures the cylinder head, cylinder block, and crankcase. A second locking bolt is away from the sprocket and secures the cylinder head, cylinder block, and crankcase. The cylinder head cover includes a cover mating surface and a side wall. The cover mating surface is locked to the upper mating surface, and the side wall corresponds to the first outer wall portion. A water pump assembly is provided in a water pump mounting hole opened in the side wall and has a rotating spindle that rotates synchronously with the camshaft assembly.

[0010] 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 and second rocker arms are pivotally mounted on the rocker arm shaft and rotated by the camshaft. The connecting mechanism can slide along the axial direction of the rocker arm shaft to separate or connect the first and second rocker arms. A water pump assembly has a water pump mounting hole in the side wall. The water pump has a rotating spindle that rotates synchronously with the camshaft assembly. The actuator includes a base plate, a push spindle, a flange, and a solenoid valve body. The actuator's flange passes through a mounting hole in the second outer wall, and the base plate is engaged with a mounting surface on the second outer wall. The control unit is electrically connected to the actuator to provide a signal to control the actuator, causing the connecting mechanism to selectively separate or connect the first and second rocker arms.

[0011] In the engine with the variable valve lift mechanism described above, viewed from the axial direction of the cylinder block, the first locking bolt and the second locking bolt can be located on opposite sides of the intake rocker arm assembly in the axial direction of the camshaft, and the second outer wall portion can be located between the first locking bolt and the second locking bolt, and the second outer wall portion can be located between the intake rocker arm assembly and the second locking bolt.

[0012] The aforementioned second locking bolt can be located on the outer side of the cylinder head cover and the second outer wall.

[0013] The aforementioned camshaft assembly may also include a reading disk with at least one protrusion and a first cam. The reading disk rotates synchronously with the camshaft. In the axial direction of the camshaft, the reading disk and the first cam are respectively disposed on both sides of the sprocket. The engine may also include a speed detector to detect the reading disk to obtain a rotation signal of the camshaft and electrically connect it to the control unit. The control unit provides a control signal to the actuator based on the rotation signal.

[0014] In the aforementioned engine with a variable valve lift mechanism, the readout disc can be located between the sprocket and the cooling water pump along the camshaft axis.

[0015] The aforementioned speed detector can be installed on the cylinder head cover or cylinder head.

[0016] When viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder block, the top of the first locking bolt in the aforementioned engine with a variable valve lift mechanism can be higher than the top of the second locking bolt, and the top of the first locking bolt is higher than the upper mating surface, while the top of the second locking bolt is lower than the upper mating surface.

[0017] The engine with the variable valve lift mechanism described above, when viewed from the axial direction of the camshaft, the projection of the upper mating surface can be approximately U-shaped, and the mounting hole can be located within the approximately U-shaped area.

[0018] In the engine with the variable valve lift mechanism described above, when viewed from the axial direction of the cylinder block, the mounting hole may not overlap with the second locking bolt, and the solenoid valve body may overlap with the second locking bolt.

[0019] The above overview and the following detailed description are illustrative in nature and are intended to further illustrate the scope of the present invention. Other objects and advantages of the present invention will be described in the subsequent detailed embodiments and accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of an existing engine with a variable valve lift mechanism.

[0021] Figure 2 This is a top view of an existing engine with a variable valve lift mechanism.

[0022] Figure 3 This is a cross-sectional view of an existing engine with a variable valve lift mechanism.

[0023] Figure 4 This is a perspective view of an engine with a variable valve lift mechanism according to a preferred embodiment of the present invention.

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

[0025] Figure 6 This is a partial cross-sectional view of an engine with a variable valve lift mechanism according to a preferred embodiment of the present invention.

[0026] Figure 7 This is a view of the cylinder head and cylinder head cover of a preferred embodiment of the present invention, viewed from a direction that is perpendicular to both the axis of the camshaft and the axis of the cylinder block.

[0027] Figure 8 This is a partial cross-sectional view of the cylinder head of a preferred embodiment of the present invention.

[0028] Figure 9 This is a side view of a camshaft assembly according to a preferred embodiment of the present invention.

[0029] Figure 10 This is a view of the cylinder head of a preferred embodiment of the present invention, viewed from the axis of the camshaft.

[0030] Figure 11 This is another view of the cylinder head of a preferred embodiment of the present invention, viewed from the axis of the camshaft.

[0031] Figure 12 This is a top view of the cylinder head of a preferred embodiment of the present invention.

[0032] Explanation of key component symbols:

[0033] 1 Engine

[0034] 2. Crankcase

[0035] 21 Crankshaft

[0036] 3. Cylinder block

[0037] 4. Cylinder head assembly structure

[0038] 41 Cylinder head

[0039] 411 First outer wall section

[0040] 412 Second outer wall portion

[0041] 412a Mounting Hole

[0042] 412b mounting base

[0043] 413 Upper mating surface

[0044] 414 Lower mating surface

[0045] 42 Camshaft Assembly

[0046] 421 Camshaft

[0047] 422 sprocket

[0048] 423 Read disk

[0049] 4231 Bump

[0050] 424 First Cam

[0051] 425 chain

[0052] 43 First locking bolt

[0053] 44 Second locking bolt

[0054] 45 Cylinder head cover

[0055] 451 Cover mating seat surface

[0056] 452 sidewall

[0057] 46 Rocker arm shaft

[0058] 47 Intake rocker arm assembly

[0059] 471 First rocker arm

[0060] 472 Second rocker arm

[0061] 473 Connecting Mechanism

[0062] 5. Cooling water pump

[0063] 51 Water pump mounting hole

[0064] 52 Rotating mandrel

[0065] 6 Actuators

[0066] 61 Seats

[0067] 62 Push Mandrel

[0068] 63 Flange

[0069] 64 Solenoid valve body

[0070] 7 Control Unit

[0071] 8. Speed ​​Detector

[0072] 9, 9' engine

[0073] 90, 90' cylinder head

[0074] 901 First Rocker Arm

[0075] 902 Second rocker arm

[0076] 903 Rocker Arm Shaft

[0077] 91, 91' connecting mechanism

[0078] 911, 911' putter

[0079] 912, 912' Connecting Pin

[0080] 913, 913' Returning spring

[0081] 92, 92' Cylinder Head Cover

[0082] 93. Examining the Gap

[0083] 93' Camshaft Assembly

[0084] 931' Camshaft

[0085] 932' sprocket

[0086] 933' Read disk

[0087] 94 View Window

[0088] 94' Pressure Relief Mechanism

[0089] 941' centrifuge block

[0090] 95 Inspection window cover

[0091] 95' Rotational Speed ​​Detector

[0092] 96 Combined seat surface

[0093] 96' upper mating surface

[0094] 97 Actuator

[0095] 97' wall section

[0096] 971 mounting holes

[0097] 98 Supporting Wall

[0098] 98' Cooling water pump

[0099] 99 Wall section

[0100] θ (angle)

[0101] C1 axis

[0102] C2 axis

[0103] C3 axis Detailed Implementation

[0104] Please see Figures 4 to 9 The figures show a perspective view, an exploded view, a partial sectional view, a view of the cylinder head and cylinder head cover viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder block, a partial sectional view of the cylinder head, and a side view of the camshaft assembly, respectively, of an engine with a variable valve lift mechanism according to a preferred embodiment of the present invention. The figures illustrate an engine 1 with a variable valve lift mechanism, comprising a crankcase 2, a cylinder block 3, a cylinder head assembly structure 4, a rocker arm shaft 46, an intake rocker arm assembly 47, a first locking bolt 43, a second locking bolt 44, an actuator 6, a control unit 7, and a speed detector 8.

[0105] In this embodiment, a crankshaft 21 is pivotally mounted inside the crankcase 2. The cylinder block 3 is mounted on the crankcase 2. The cylinder head assembly structure 4 includes a cylinder head 41, a camshaft assembly 42, a cylinder head cover 45, and a cooling water pump 5. The cylinder head 41 includes a first outer wall portion 411, a second outer wall portion 412, an upper mating surface 413, and a lower mating surface 414, wherein the upper mating surface 413 and the lower mating surface 414 are not parallel and form an included angle θ (e.g., ...). Figure 7 As shown), the cylinder head 41 and the cylinder block 3 are joined by the mating surface 414 below the cylinder head 41. The second outer wall portion 412 is provided with a mounting surface 412b and a mounting hole 412a (as shown). Figure 8 (As shown). The camshaft assembly 42 is pivotally mounted on the cylinder head 41 and includes a camshaft 421, a sprocket 422, and a camshaft with at least one protrusion 4231 (as shown). Figure 9The reading disk 423 and a first cam 424 (shown) are connected to the crankshaft 21 via a chain 425. A first outer wall portion 411 is adjacent to the sprocket 422. Along the axial direction of the camshaft 421, the first outer wall portion 411 and the second outer wall portion 412 are located on opposite sides of the camshaft assembly 422. The reading disk 423 rotates synchronously with the camshaft 421. Along the axial direction of the camshaft 421, the reading disk 423 and the first cam 424 are respectively disposed on both sides of the sprocket 422. Furthermore, as shown... Figure 7 As shown, viewed from a direction perpendicular to both the axis C2 of the camshaft 421 and the axis C3 of the cylinder block 3, the upper mating surface 413 overlaps with the camshaft 421, the first outer wall portion 411 is lower than the second outer wall portion 412, and the first outer wall portion 411 is even lower than the camshaft 421. Furthermore, the first locking bolt 43 is adjacent to the sprocket 422, securing the cylinder head 41, the cylinder block 3, and the crankcase 2, while the second locking bolt 44 is away from the sprocket 422, securing the cylinder head 41, the cylinder block 3, and the crankcase 2. In this embodiment, viewed from the axis C3 of the cylinder block 3, in the direction of the axis C2 of the camshaft 421, the first locking bolt 43 and the second locking bolt 44 are located on opposite sides of the intake rocker arm assembly 47, and the second outer wall portion 412 is located between the first locking bolt 43 and the second locking bolt 44, and the second outer wall portion 412 is located between the intake rocker arm assembly 47 and the second locking bolt 44. The cylinder head cover 45 includes a cover mating surface 451 and a side wall 452, the side wall 452 corresponding to the first outer wall portion 411, and having a water pump mounting hole 51 (e.g. Figure 6 and Figure 8 As shown), the cover mating surface 451 is locked to the upper mating surface 413, and in this embodiment, the second locking bolt 44 is provided on the outside of the cylinder head cover 45 and the second outer wall portion 412.

[0106] The rocker arm shaft 46 is supported on the cylinder head 41. The intake rocker arm assembly 47 includes a first rocker arm 471, a second rocker arm 472, and a connecting mechanism 473. The first rocker arm 471 and the second rocker arm 472 are pivotally mounted on the rocker arm shaft 46 and rotated by the camshaft 421. The connecting mechanism 473 can slide along the axis C1 of the rocker arm shaft 46 to separate or connect the first rocker arm 471 and the second rocker arm 472. The cooling water pump 5 is provided in the water pump mounting hole 51 opened in the side wall 452. The cooling water pump 5 has a rotating spindle 52 that rotates synchronously with the camshaft 421. The reading disk 423 is located between the sprocket 422 and the cooling water pump 5 in the axis C2 direction of the camshaft 421. The actuator 6 includes a base plate 61, a pusher spindle 62, a flange 63, and a solenoid valve body 64. The actuator 6 inserts its flange 63 into a mounting hole 412a in the second outer wall portion 412, and its base plate 61 is attached to a mounting surface 412b on the second outer wall portion 412. The control unit 7 is electrically connected to the actuator 6 and provides a signal to control the actuator 6, causing the connecting mechanism 473 to selectively separate or connect the first rocker arm 471 and the second rocker arm 472. The speed detector 8 is mounted on the cylinder head cover 45 in this embodiment, but is not limited thereto and can also be mounted on the cylinder head 41. It is used to detect the reading disk 423 to obtain a rotation signal of the camshaft 421 and is electrically connected to the control unit 7. The control unit 7 provides a control signal to the actuator 6 based on the rotation signal.

[0107] Please see Figure 10 This is a view of the cylinder head of a preferred embodiment of the present invention, viewed from the axis of the camshaft. As shown in the figure, when viewed from the axis C2 of the camshaft 421, the projection of the upper mating surface 413 is approximately U-shaped, and the mounting hole 412a is located within the approximately U-shaped area.

[0108] Please see Figure 11 This is another view of the cylinder head of a preferred embodiment of the present invention, viewed from the axis of the camshaft. Figure 7 and Figure 11 As shown, when viewed from the direction that is perpendicular to both the axis C2 of the camshaft 421 and the axis C3 of the cylinder block 3, the top of the first locking bolt 43 is higher than the top of the second locking bolt 44, and the top of the first locking bolt 43 is higher than the upper mating surface 413, while the top of the second locking bolt 44 is lower than the upper mating surface 413.

[0109] Please see Figure 12 This is a top view of the cylinder head according to a preferred embodiment of the present invention. As shown in the figure, when viewed from the axis C3 direction of the cylinder body 3, the mounting hole 412a does not overlap with the second locking bolt 44, and the solenoid valve body 64 overlaps with the second locking bolt 44.

[0110] With the above design, the intake rocker arm assembly 47 and the actuator 6 are first assembled on the cylinder head 41, and then the cylinder head cover 45 is assembled. Therefore, compared with the prior art, it is beneficial to control and inspect the production precision of the connecting mechanism 473, and the inspection window 94 and inspection window cover 95 of the cylinder head cover 92 in the prior art are not required. In addition, since (1) the second outer wall portion 412 of the cylinder head 41 is located between the intake rocker arm assembly 47 and the second locking bolt 44; (2) the mounting hole 412a is provided on the second outer wall portion 412 and does not overlap with the second locking bolt 44; (3) the second locking bolt 44 is located outside the cylinder head cover 45 and the second outer wall portion 412. Thus, compared with the prior art, the support wall 98 of the push rod 911 and the wall portion 99 of the mounting hole 971 can be combined into one unit, which allows the actuator 6 of this utility model to be closer to the axis C3 of the cylinder block 3, which is beneficial to the miniaturization of the engine 1. Furthermore, the first outer wall portion 411 is lower than the second outer wall portion 412 and lower than the camshaft 421, which facilitates the assembly of the camshaft assembly 42 and the chain 425.

[0111] The above embodiments are merely illustrative examples for ease of explanation. The scope of the rights claimed by this utility model should be determined by the scope of protection claimed in the patent application documents, and not limited to the above embodiments.

Claims

1. A cylinder head assembly structure characterized by comprising: The application relates to a cylinder head assembly structure. The cylinder head assembly structure comprises a cylinder head, a camshaft assembly, a cylinder head cover and a cooling water pump. The cylinder head comprises a first outer wall part, a second outer wall part, an upper joint surface and a lower joint surface. The upper joint surface and the lower joint surface are not parallel and form an included angle. The cylinder head is combined with a cylinder body through the lower joint surface.

2. An engine having a variable valve lift mechanism, characterized by comprising: The camshaft assembly is pivotally arranged on the cylinder head and comprises a camshaft and a chain wheel. The camshaft assembly is connected with a crankshaft through a chain. The first outer wall part is adjacent to the chain wheel. In the axial direction of the camshaft, the first outer wall part and the second outer wall part are respectively located on the opposite sides of the camshaft assembly. From the direction perpendicular to the axial line of the camshaft and the axial line of the cylinder body, the upper joint surface overlaps the camshaft. The first outer wall part is lower than the second outer wall part. The first outer wall part is lower than the camshaft. The cylinder head cover comprises a cover joint seat surface and a side wall. The cover joint seat surface is locked to the upper joint surface. The side wall corresponds to the first outer wall part. The cooling water pump is arranged in a water pump mounting hole of the side wall. The cooling water pump has a rotating shaft which rotates synchronously with the camshaft assembly. The application relates to a cylinder head assembly structure. The cylinder head assembly structure comprises a cylinder head, a camshaft assembly, a cylinder head cover and a cooling water pump. The cylinder head comprises a first outer wall part, a second outer wall part, an upper joint surface and a lower joint surface. The upper joint surface and the lower joint surface are not parallel and form an included angle. The cylinder head is combined with a cylinder body through the lower joint surface. The camshaft assembly is pivotally arranged on the cylinder head and comprises a camshaft and a chain wheel. The camshaft assembly is connected with a crankshaft through a chain. The first outer wall part is adjacent to the chain wheel. In the axial direction of the camshaft, the first outer wall part and the second outer wall part are respectively located on the opposite sides of the camshaft assembly. From the direction perpendicular to the axial line of the camshaft and the axial line of the cylinder body, the upper joint surface overlaps the camshaft. The first outer wall part is lower than the second outer wall part. The first outer wall part is lower than the camshaft. The cylinder head cover comprises a cover joint seat surface and a side wall. The cover joint seat surface is locked to the upper joint surface. The side wall corresponds to the first outer wall part. The cooling water pump is arranged in a water pump mounting hole of the side wall. The cooling water pump has a rotating shaft which rotates synchronously with the camshaft assembly. The application relates to a cylinder head assembly structure. The cylinder head assembly structure comprises a cylinder head, a camshaft assembly, a cylinder head cover and a cooling water pump. The cylinder head comprises a first outer wall part, a second outer wall part, an upper joint surface and a lower joint surface. The upper joint surface and the lower joint surface are not parallel and form an included angle. The cylinder head is combined with a cylinder body through the lower joint surface. The camshaft assembly is pivotally arranged on the cylinder head and comprises a camshaft and a chain wheel. The camshaft assembly is connected with a crankshaft through a chain. The first outer wall part is adjacent to the chain wheel. In the axial direction of the camshaft, the first outer wall part and the second outer wall part are respectively located on the opposite sides of the camshaft assembly. From the direction perpendicular to the axial line of the camshaft and the axial line of the cylinder body, the upper joint surface overlaps the camshaft. The first outer wall part is lower than the second outer wall part. The first outer wall part is lower than the camshaft. The cylinder head cover comprises a cover joint seat surface and a side wall. The cover joint seat surface is locked to the upper joint surface. The side wall corresponds to the first outer wall part. The cooling water pump is arranged in a water pump mounting hole of the side wall. The cooling water pump has a rotating shaft which rotates synchronously with the camshaft assembly. The application relates to a cylinder head assembly structure. The cylinder head assembly structure comprises a cylinder head, a camshaft assembly, a cylinder head cover and a cooling water pump. The cylinder head comprises a first outer wall part, a second outer wall part, an upper joint surface and a lower joint surface. The upper joint surface and the lower joint surface are not parallel and form an included angle. The cylinder head is combined with a cylinder body through the lower joint surface. The camshaft assembly is pivotally arranged on the cylinder head and comprises a camshaft and a chain wheel. The camshaft assembly is connected with a crankshaft through a chain. The first outer wall part is adjacent to the chain wheel. In the axial direction of the camshaft, the first outer wall part and the second outer wall part are respectively located on the opposite sides of the camshaft assembly. From the direction perpendicular to the axial line of the camshaft and the axial line of the cylinder body, the upper joint surface overlaps the camshaft. The first outer wall part is lower than the second outer wall part. The first outer wall part is lower than the camshaft. The cylinder head cover comprises a cover joint seat surface and a side wall. The cover joint seat surface is locked to the upper joint surface. The side wall corresponds to the first outer wall part. The cooling water pump is arranged in a water pump mounting hole of the side wall. The cooling water pump has a rotating shaft which rotates synchronously with the camshaft assembly. A control unit, electrically connected to the actuator, provides a signal to control the actuator, causing the linkage mechanism to selectively disconnect or connect the first rocker arm and the second rocker arm.

3. The engine with a variable valve lift mechanism according to claim 2, wherein Viewed from the axial direction of the cylinder block, in the axial direction of the camshaft, the first locking bolt and the second locking bolt are respectively located on opposite sides of the intake rocker arm assembly, and the second outer wall portion is located between the first locking bolt and the second locking bolt, and the second outer wall portion is located between the intake rocker arm assembly and the second locking bolt.

4. The engine with a variable valve lift mechanism according to claim 2, wherein The second locking bolt is located on the outer side of the cylinder head cover and the second outer wall portion.

5. The engine with a variable valve lift mechanism according to claim 2, wherein The camshaft assembly also includes a read disk with at least one protrusion and a first cam. The read disk rotates synchronously with the camshaft. The read disk and the first cam are respectively disposed on both sides of the sprocket in the axial direction of the camshaft. The engine also includes a speed detector for detecting the read disk to obtain a rotation signal of the camshaft and is electrically connected to the control unit. The control unit provides a control signal to the actuator based on the rotation signal.

6. The engine with a variable valve lift mechanism according to claim 5, wherein The reading disk is located between the sprocket and the cooling water pump along the axial direction of the camshaft.

7. The engine with a variable valve lift mechanism according to claim 5, wherein The speed detector assembly is located on the cylinder head cover or the cylinder head.

8. The engine with a variable valve lift mechanism according to claim 2, wherein Viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder block, the top of the first locking bolt is higher than the top of the second locking bolt, and the top of the first locking bolt is higher than the upper mating surface, while the top of the second locking bolt is lower than the upper mating surface.

9. The engine with a variable valve lift mechanism according to claim 2, wherein Viewed from the axial direction of the camshaft, the projection of the upper mating surface is approximately square, and the mounting hole is located within this approximately square shape.

10. The engine with a variable valve lift mechanism according to claim 2, wherein Viewed from the axial direction of the cylinder block, the mounting hole does not overlap with the second locking bolt, and the solenoid valve body overlaps with the second locking bolt.

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