Engine with multiple ignition devices and motorcycle with engine

Abstract

The utility model relates to an engine with a plurality of ignition devices and a motorcycle with the engine. The engine with the plurality of ignition devices comprises a cylinder, a cylinder head assembly, a first spark plug and a cylinder head cover. The cylinder head assembly comprises a cylinder head, an air inlet rocker arm, an air exhaust rocker arm, an air inlet valve, an air exhaust valve and a cam shaft, the air inlet rocker arm, the air exhaust rocker arm, the air inlet valve, the air exhaust valve and the cam shaft are contained in the cylinder head, the cylinder head is provided with a combination seat face, a combustion chamber, an outer wall portion and a chain chamber, and the outer wall portion is provided with a first installation hole penetrating from the cylinder head to the combustion chamber. The first spark plug is installed in the first installation hole, and the cylinder head cover is locked and attached to the combination seat face. The cylinder head further comprises a second installation hole penetrating from the cylinder head to the combustion chamber and a sleeve communicated with the second installation hole, the second installation hole is located between the air inlet valve and the chain chamber or located between the exhaust valve and the chain chamber, the cylinder head cover further comprises a through hole, and a first end of the sleeve penetrates through the through hole. A second end of the sleeve is assembled on the cylinder head, the engine further comprises a second spark plug, and the second spark plug is assembled in the sleeve and installed in the second installation hole.

Description

Technical Field

[0001] The utility model relates to an engine with multiple ignition devices and a motorcycle with the engine, in particular to an engine with multiple ignition devices suitable for power vehicles and a motorcycle with the engine. Background Art

[0002] In recent years, due to the strict environmental protection regulations of countries around the world and the energy crisis, motorcycle manufacturers have actively developed low-pollution, low-fuel consumption and high-performance engines, and in Taiwan, China, scooters are the largest.

[0003] In the past, the cylinder head of the engine used a spark plug for ignition, but it is no longer able to cope with the increasingly stringent regulations in the future under various operations and loads, so that fuel consumption, pollution and performance cannot be taken into account at the same time. Therefore, in order to further reduce the fuel consumption and pollution of scooters, in addition to optimizing the combustion chamber and other means, a second spark plug can also be configured on the engine (such as Taiwan's new patent No. M607042) to improve the combustion efficiency of the engine during the combustion stroke. The configuration of the dual spark plugs is specifically to solve the problem that when the motorcycle starts and accelerates, the engine mixture is richer and needs to be burned more efficiently to avoid serious exhaust pollution, thereby reducing the use of precious metals in the catalytic converter for exhaust aftertreatment, which can reduce engine fuel consumption and pollution. However, for the sake of environmental protection and energy conservation, the pursuit of reducing pollution and reducing fuel consumption must be continuous, so there is still room for improvement in existing technologies.

[0004] In addition, in the above-mentioned prior art, when the scooter with a front pedal is equipped with a second spark plug, due to the configuration of the engine cylinder head parts, when viewed from the top of the motorcycle, the first and second spark plugs are respectively arranged on opposite sides of the cylinder head air inlet, and when viewed from the left side of the motorcycle, the second spark plug is located above the front section auxiliary pipe and below the rear section auxiliary pipe. When repairing, many appearance parts need to be disassembled, which is more troublesome and less convenient. The engine of the prior art is an air-cooled engine. If it is a water-cooled engine, the position of the second spark plug is likely to cause a poor water jacket flow channel and affect the cooling effect.

[0005] The inventor has therefore been eager to devise an engine with multiple ignition devices and a motorcycle with the engine that can solve the above 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 multiple ignition devices and a motorcycle with the engine. By adjusting the configuration positions of the first spark plug and the second spark plug and optimizing the configuration structure of the second spark plug, the cylinder head further includes a second mounting hole penetrating from the cylinder head to the combustion chamber and a sleeve connected to the second mounting hole, and the cylinder head cover further includes a through hole, the first end of the sleeve is inserted into the through hole, and the second end of the sleeve is assembled on the cylinder head. Therefore, compared with the prior art, it has better assembly and maintainability, which is actually an optimized design.

[0007] To achieve the above-mentioned purpose, the engine with multiple ignition devices of the utility model includes a cylinder, a cylinder head assembly, a first spark plug and a cylinder head cover. The cylinder head assembly is fixedly mounted in the cylinder, including a cylinder head and an intake rocker arm, an exhaust rocker arm, an intake valve, an exhaust valve and a camshaft accommodated in the cylinder head. The cylinder head has a coupling seat surface, a combustion chamber, an outer wall portion and a chain chamber. The outer wall portion and the chain chamber are respectively located at opposite ends of the camshaft. The outer wall portion has a first mounting hole that passes through the cylinder head to the combustion chamber. The first spark plug is mounted in the first mounting hole. When viewed from the axial direction of the cylinder, the top end of the first spark plug is located on the outside of the coupling seat surface. The cylinder head cover is locked to the coupling seat surface. The cylinder head further includes a second mounting hole extending from the cylinder head to the combustion chamber and a sleeve connected to the second mounting hole. When viewed from the axial direction of the cylinder, the second mounting hole is located between the intake valve and the chain chamber or between the exhaust valve and the chain chamber, and the second mounting hole is located on the inner side of the coupling seat surface. The cylinder head cover further includes a through hole, a first end of the sleeve is passed through the through hole, and a second end of the sleeve is assembled in the cylinder head. The engine further includes a second spark plug, which is assembled in the sleeve and installed in the second mounting hole.

[0008] In one embodiment, the combination seat surface may be an annular structure.

[0009] In one embodiment, when viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder, the first spark plug may not overlap with the camshaft, and the second spark plug may overlap with the camshaft.

[0010] In one embodiment, when viewed from the axial direction of the camshaft, the sleeve may overlap with the coupling seat surface.

[0011] In one embodiment, when viewed from the axial direction of the cylinder, the through hole may overlap with the coupling seat surface.

[0012] In one embodiment, a sealing member may be assembled between the cylinder head cover and the sleeve to seal the through hole.

[0013] In one embodiment, the second end of the sleeve can be tightly fitted and fixed to the cylinder head, or can be loosely fitted and assembled to the cylinder head.

[0014] In one embodiment, when viewed from the combustion chamber toward the axial direction of the cylinder, the axis of the intake valve and the axis of the second spark plug, or the axis of the exhaust valve and the axis of the second spark plug, are respectively disposed on both sides of the first center line of the combustion chamber.

[0015] In one embodiment, when viewed from the combustion chamber toward the axis of the cylinder, the axis of the intake valve and the axis of the second spark plug, or the axis of the exhaust valve and the axis of the second spark plug are respectively disposed on both sides of the second center line of the combustion chamber.

[0016] In one embodiment, the engine may be a water-cooled engine, and the cylinder head may further include a water jacket surrounding the first mounting hole and the second mounting hole for cooling the first spark plug and the second spark plug. Alternatively, the engine may also be an air-cooled engine.

[0017] Secondly, the motorcycle of the utility model comprises a frame, a fuel tank, a storage box and an engine with multiple ignition devices. The frame comprises a head pipe, a main pipe, a bottom pipe and a tail pipe connected in sequence. The fuel tank is locked to the frame, and the storage box is locked to the frame. The engine group is arranged on the frame, and comprises a cylinder, a cylinder head assembly, a first spark plug and a cylinder head cover. The cylinder head assembly is fixed to the cylinder, and comprises a cylinder head and an intake rocker arm, an exhaust rocker arm, an intake valve, an exhaust valve and a camshaft accommodated in the cylinder head. The cylinder head has a coupling seat surface, a combustion chamber, an outer wall portion and a chain chamber. The outer wall portion and the chain chamber are respectively located at opposite ends of the camshaft. The outer wall portion has a first mounting hole that passes through the cylinder head to the combustion chamber. The first spark plug is installed in the first mounting hole. When viewed from the axial direction of the cylinder, the top end of the first spark plug is located on the outer side of the coupling seat surface. The cylinder head cover is locked to the coupling seat surface. The cylinder head further includes a second mounting hole extending from the cylinder head to the combustion chamber and a sleeve connected to the second mounting hole. When viewed from the axial direction of the cylinder, the second mounting hole is located between the intake valve and the chain chamber or between the exhaust valve and the chain chamber, and the second mounting hole is located on the inner side of the coupling seat surface. The cylinder head cover further includes a through hole, a first end of the sleeve is inserted into the through hole, and a second end of the sleeve is assembled in the cylinder head. The engine further includes a second spark plug, which is assembled in the sleeve and installed in the second mounting hole. When viewed from the side of the motorcycle, the first spark plug and the second spark plug are both arranged behind the fuel tank, below a bottom surface of the storage box, and above an extension line of the bottom pipe.

[0018] In one embodiment, when viewed from the side of the motorcycle, the sleeve and the tail pipe may partially overlap.

[0019] In one embodiment, the bottom tube may be an approximately straight line segment.

[0020] In one embodiment, the tail pipe may be an ascending curved section.

[0021] In one embodiment, the engine can swing and rotate relative to the frame.

[0022] In one embodiment, the motorcycle may be a scooter.

[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 It is a three-dimensional diagram of the engine according to the first embodiment of the utility model.

[0025] Figure 2 It is a top view of the cylinder head assembly and the cylinder head cover of the first embodiment of the utility model.

[0026] Figure 3 It is a top view of the cylinder head assembly of the first embodiment of the utility model.

[0027] Figure 4 It is a partially cutaway perspective view of a cylinder head assembly according to the first embodiment of the present invention.

[0028] Figure 5 It is a bottom view of the cylinder head assembly of the first embodiment of the utility model.

[0029] Figure 6 It is a cross-sectional view of a cylinder head assembly according to the first embodiment of the present utility model.

[0030] Figure 7 It is a cross-sectional view of the cylinder head assembly of the first embodiment of the utility model from another perspective.

[0031] Fig. 8A and Figure 8B This is a configuration diagram of the water jacket of the first embodiment of the utility model.

[0032] Fig. 9 It is a top view of a cylinder head assembly and a cylinder head cover according to a second embodiment of the present invention.

[0033] Fig.10 It is a top view of a cylinder head assembly according to a second embodiment of the present utility model.

[0034] Fig.11 It is a partially cutaway perspective view of a cylinder head assembly according to a second embodiment of the present invention.

[0035] Fig.12 It is a bottom view of a cylinder head assembly according to a second embodiment of the present utility model.

[0036] Fig.13 It is a cross-sectional view of a cylinder head assembly according to a second embodiment of the present invention.

[0037] Fig.14 It is a cross-sectional view from another perspective of the cylinder head assembly of the second embodiment of the present invention.

[0038] Fig.15A and Fig. 15B This is a configuration diagram of the water jacket of the second embodiment of the utility model.

[0039] Fig.16 It is a side view of a motorcycle according to a third embodiment of the present utility model.

[0040] Fig.17 It is a partial front view of a motorcycle according to a third embodiment of the present utility model.

[0041] Fig.18 It is a side view of a motorcycle according to a fourth embodiment of the present utility model.

[0042] Fig.19 It is a partial front view of a motorcycle according to a fourth embodiment of the present utility model.

[0043] Description of main component symbols:

[0044] 1,1' Engine

[0045] 10,10' Motorcycle

[0046] 11 Frame

[0047] 111 Head pipe

[0048] 112 Supervisor

[0049] 113 bottom tube

[0050] 114 Tail pipe

[0051] 12 Fuel tank

[0052] 13 Storage Box

[0053] 130 Bottom

[0054] 2 Cylinders

[0055] 3,3' cylinder head assembly

[0056] 30 Sleeve

[0057] 301 First End

[0058] 302 Second End

[0059] 31 Cylinder head

[0060] 311 Combined seat surface

[0061] 312 Combustion Chamber

[0062] 313 Outer wall

[0063] 314 Chain Room

[0064] 32 Intake rocker arm

[0065] 33 Exhaust rocker arm

[0066] 34 Inlet valve

[0067] 340 Axis

[0068] 35 Exhaust valve

[0069] 350 Axis

[0070] 36 Camshaft

[0071] 37 Water Jacket

[0072] 4 The First Spark Plug

[0073] 5,5' cylinder head cover

[0074] 51 Seals

[0075] 6 Second Spark Plug

[0076] 60 Axis

[0077] C1 First center line

[0078] C2 Second center line

[0079] C3 extension line

[0080] h1 First mounting hole

[0081] h2 Second mounting hole

[0082] h3 through hole

[0083] L1, L2 axis DETAILED DESCRIPTION

[0084] Figures 1 to 4 The figures are respectively a perspective view of an engine of the first embodiment of the utility model, a top view of a cylinder head assembly and a cylinder head cover, a top view of a cylinder head assembly, and a partially cutaway perspective view of a cylinder head assembly. The figure shows an engine 1 with multiple ignition devices. In this embodiment, the multiple ignition devices are two spark plugs, mainly including a cylinder 2, a cylinder head assembly 3, a first spark plug 4, a cylinder head cover 5, and a second spark plug 6.

[0085] The cylinder head assembly 3 is fixed to the cylinder 2, and includes a cylinder head 31 and an intake rocker arm 32, an exhaust rocker arm 33, an intake valve 34, an exhaust valve 35 and a camshaft 36 accommodated in the cylinder head 31. The cylinder head 31 has a combination seat surface 311, a combustion chamber 312, an outer wall portion 313, a chain chamber 314, a first mounting hole h1, a second mounting hole h2 and a sleeve 30. The combination seat surface 311 is an annular structure formed along the top edge of the cylinder head 31, and the cylinder head cover 5 is locked on the combination seat surface 311. The combustion chamber 312 is located in the accommodating space below the cylinder head 31, and the outer wall portion 313 and the chain chamber 314 are respectively located on the opposite end sides of the camshaft 36. The outer wall portion 313 has a first mounting hole h1 that passes through the cylinder head 31 to the combustion chamber 312. The cylinder head 31 further includes a second mounting hole h2 that passes through the cylinder head 31 to the combustion chamber 312. The second mounting hole h2 is connected to the sleeve 30. In this embodiment, when viewed from the axis L1 direction of the cylinder 2, the second mounting hole h2 is located between the exhaust valve 35 and the chain chamber 314, and the second mounting hole h2 is located on the inner side of the coupling seat surface 311.

[0086] The first spark plug 4 is installed in the first mounting hole h1. When viewed from the axis L1 of the cylinder 2, the top of the first spark plug 4 is located outside the coupling seat surface 311. The second spark plug 6 is assembled in the sleeve 30 and installed in the second mounting hole h2. The cylinder head cover 5 further includes a through hole h3. When viewed from the axis L1 of the cylinder 2, the through hole h3 overlaps with the coupling seat surface 311. A first end 301 of the sleeve 30 is inserted into the through hole h3. A second end 302 of the sleeve 30 can be tightly fitted and fixed to the cylinder head, or can be loosely fitted and assembled to the cylinder head. In this embodiment, it is tightly fitted and fixed to the cylinder head 31, so that the sleeve 30 and the second mounting hole h2 form a connected through hole for the second spark plug 6 to be inserted. In addition, a sealing member 51 is assembled between the cylinder head cover 5 and the sleeve 30 of this embodiment, so that the sealing member 51 is sleeved on the sleeve 30 to seal the through hole h3.

[0087] Figure 5 This is a bottom view of the cylinder head assembly of the first embodiment of the utility model. As shown in the figure, when viewed from the combustion chamber 312 toward the axis L1 of the cylinder 2, in this embodiment, the axis 340 of the intake valve 34 and the axis 60 of the second spark plug 6 are respectively arranged on both sides of the first center line C1 of the combustion chamber 312. The axis 350 of the exhaust valve 35 and the axis 60 of the second spark plug 6 are respectively arranged on both sides of the second center line C2 of the combustion chamber 312.

[0088] Figure 6As shown in the figure, when viewed from a direction perpendicular to both the axis L2 of the camshaft 36 and the axis L1 of the cylinder 2, the first spark plug 4 does not overlap with the camshaft 36, while the second spark plug 6 overlaps with the camshaft 36.

[0089] Figure 7 This is a cross-sectional view of the cylinder head assembly of the first embodiment of the utility model from another perspective. As shown in the figure, when viewed from the axis L2 of the camshaft 36, the sleeve 30 overlaps with the seat surface 311.

[0090] Fig. 8A and Figure 8B This is a configuration diagram of the water jacket of the first embodiment of the utility model. As shown in the figure, the engine 1 of this embodiment is a water-cooled engine, and the cylinder head 31 further includes a water jacket 37 surrounding the first mounting hole h1 and the second mounting hole h2, which helps to cool the vicinity of the first mounting hole h1 and the second mounting hole h2, thereby achieving a cooling effect on the first spark plug 4 and the second spark plug 6. However, the configuration structure of the multiple ignition devices of this embodiment is not limited to a water-cooled engine, and can also be an air-cooled engine.

[0091] Figures 9 to 11 The figures are respectively a top view of a cylinder head assembly and a cylinder head cover of a second embodiment of the present invention, a top view of a cylinder head assembly, and a partially cutaway perspective view of a cylinder head assembly. The figure shows an engine with multiple ignition devices, and its basic structure is roughly the same as that of the first embodiment, which can be referred to together. Figure 1 The engine structure, in this embodiment, the plurality of ignition devices are two spark plugs, mainly including a cylinder 2, a cylinder head assembly 3', a first spark plug 4, a cylinder head cover 5' and a second spark plug 6, which is only adjusted in the structural configuration of the cylinder head assembly 3' and the cylinder head cover 5', so the cylinder 2 can refer to Figure 1 Marking.

[0092] The cylinder head assembly 3' is fixed to the cylinder 2, and includes a cylinder head 31 and an intake rocker arm 32, an exhaust rocker arm 33, an intake valve 34, an exhaust valve 35 and a camshaft 36 accommodated in the cylinder head 31. The cylinder head 31 has a combination seat surface 311, a combustion chamber 312, an outer wall portion 313, a chain chamber 314, a first mounting hole h1, a second mounting hole h2 and a sleeve 30. The combination seat surface 311 is an annular structure formed along the top edge of the cylinder head 31, and the cylinder head cover 5' is locked on the combination seat surface 311. The combustion chamber 312 is located in the accommodating space below the cylinder head 31, and the outer wall portion 313 and the chain chamber 314 are respectively located on the opposite end sides of the camshaft 36. The outer wall portion 313 has a first mounting hole h1 that passes through the cylinder head 31 to the combustion chamber 312. The cylinder head 31 further includes a second mounting hole h2 that passes through the cylinder head 31 to the combustion chamber 312. The second mounting hole h2 is connected to the sleeve 30. In this embodiment, when viewed from the axis L1 direction of the cylinder 2, the second mounting hole h2 is located between the intake valve 34 and the chain chamber 314, and the second mounting hole h2 is located on the inner side of the coupling seat surface 311.

[0093] The first spark plug 4 is installed in the first mounting hole h1. When viewed from the axis L1 of the cylinder 2, the top of the first spark plug 4 is located outside the coupling seat surface 311. The second spark plug 6 is assembled in the sleeve 30 and installed in the second mounting hole h2. The cylinder head cover 5' further includes a through hole h3. When viewed from the axis L1 of the cylinder 2, the through hole h3 overlaps with the coupling seat surface 311. A first end 301 of the sleeve 30 is inserted into the through hole h3. A second end 302 of the sleeve 30 can be tightly fitted and fixed to the cylinder head, or can be loosely fitted and assembled to the cylinder head. In this embodiment, it is tightly fitted and fixed to the cylinder head 31, so that the sleeve 30 and the second mounting hole h2 form a connected through hole for the second spark plug 6 to be inserted. In addition, a sealing member 51 is assembled between the cylinder head cover 5' and the sleeve 30 of this embodiment, so that the sealing member 51 is sleeved on the sleeve 30 to seal the through hole h3.

[0094] Fig.12 This is a bottom view of the cylinder head assembly of the second embodiment of the utility model. As shown in the figure, when viewed from the combustion chamber 312 toward the axis L1 of the cylinder 2, in this embodiment, the axis 350 of the exhaust valve 35 and the axis 60 of the second spark plug 6 are respectively arranged on both sides of the first center line C1 of the combustion chamber 312. The axis 340 of the intake valve 34 and the axis 60 of the second spark plug 6 are respectively arranged on both sides of the second center line C2 of the combustion chamber 312.

[0095] Fig.13As shown in the figure, when viewed from a direction perpendicular to both the axis L2 of the camshaft 36 and the axis L1 of the cylinder 2, the first spark plug 4 does not overlap with the camshaft 36, while the second spark plug 6 overlaps with the camshaft 36.

[0096] Fig.14 This is a cross-sectional view of the cylinder head assembly of the second embodiment of the present invention from another perspective. As shown in the figure, when viewed from the axis L2 of the camshaft 36, the sleeve 30 overlaps with the coupling seat surface 311.

[0097] Fig.15A and Fig. 15B This is a configuration diagram of the water jacket of the second embodiment of the utility model. As shown in the figure, the engine of this embodiment is a water-cooled engine, and the cylinder head 31 further includes a water jacket 37 surrounding the first mounting hole h1 and the second mounting hole h2, which helps to cool the vicinity of the first mounting hole h1 and the second mounting hole h2, thereby achieving a cooling effect on the first spark plug 4 and the second spark plug 6. However, the configuration structure of the multiple ignition devices of this embodiment is not limited to a water-cooled engine, and can also be an air-cooled engine.

[0098] Fig.16 and Fig.17 The figures are respectively a side view of a motorcycle according to the third embodiment of the utility model and a partial front view of the motorcycle. A motorcycle 10 is shown in the figure. The motorcycle 10 of the present embodiment is a scooter type motorcycle, comprising a frame 11, a fuel tank 12, a storage box 13 and an engine 1. The frame 11 comprises a head pipe 111, a main pipe 112, a bottom pipe 113 and a tail pipe 114 connected in sequence. The bottom pipe 113 is an approximately straight line segment, and the tail pipe 114 is an ascending curved segment. The fuel tank 12 and the storage box 13 are respectively locked on the frame 11. The engine 1 described in the present embodiment is assembled on the frame 11 and can swing and rotate relative to the frame 11. It is the engine 1 of the first embodiment, so the structural features of the engine 1 can refer to the description of the first embodiment, and will not be repeated here.

[0099] When viewed from the side of the motorcycle 10, the first spark plug 4 and the second spark plug 6 are both disposed behind the fuel tank 12, the first spark plug 4 and the second spark plug 6 are both disposed below a bottom surface 130 of the storage box 13, and the first spark plug 4 and the second spark plug 6 are both disposed above the extension line C3 of the bottom pipe 113. In addition, when viewed from the side of the motorcycle 10, the sleeve 30 partially overlaps with the tail pipe 114.

[0100] Fig.18 and Fig.19They are respectively a side view of a motorcycle according to the fourth embodiment of the utility model and a partial front view of the motorcycle. A motorcycle 10' is shown in the figure. The motorcycle 10' of this embodiment is a scooter type motorcycle, including a frame 11, a fuel tank 12, a storage box 13 and an engine 1'. The frame 11 includes a head pipe 111, a main pipe 112, a bottom pipe 113 and a tail pipe 114 connected in sequence. The bottom pipe 113 is an approximately straight line segment, and the tail pipe 114 is an ascending curved segment. The fuel tank 12 and the storage box 13 are respectively locked to the frame 11. The engine 1' described in this embodiment is assembled on the frame 11 and can swing and rotate relative to the frame 11. It is the engine of the second embodiment, so the structural features of the engine 1' can refer to the description of the second embodiment, and will not be repeated here.

[0101] When viewed from the side of the motorcycle 10', the first spark plug 4 and the second spark plug 6 are both disposed behind the fuel tank 12, the first spark plug 4 and the second spark plug 6 are both disposed below a bottom surface 130 of the storage box 13, and the first spark plug 4 and the second spark plug 6 are both disposed above the extension line C3 of the bottom pipe 113. In addition, when viewed from the side of the motorcycle 10', the sleeve 30 partially overlaps with the tail pipe 114.

[0102] 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 multiple ignition devices, comprising: One cylinder; a cylinder head assembly, fixedly mounted on the cylinder, comprising a cylinder head and an intake rocker arm, an exhaust rocker arm, an intake valve, an exhaust valve and a camshaft accommodated in the cylinder head, the cylinder head having a joint seat surface, a combustion chamber, an outer wall portion and a chain chamber, the outer wall portion and the chain chamber being respectively located at opposite ends of the camshaft, the outer wall portion having a first mounting hole penetrating from the cylinder head to the combustion chamber; a first spark plug mounted in the first mounting hole, wherein the top end of the first spark plug is located outside the coupling seat surface when viewed from the axial direction of the cylinder; and A cylinder head cover, locked to the joint seat surface; It is characterized in that: the cylinder head also includes a second mounting hole extending from the cylinder head to the combustion chamber and a sleeve connected to the second mounting hole. When viewed from the axial direction of the cylinder, the second mounting hole is located between the intake valve and the chain chamber or between the exhaust valve and the chain chamber, and the second mounting hole is located on the inner side of the coupling seat surface. The cylinder head cover further includes a through hole, a first end of the sleeve is passed through the through hole, and a second end of the sleeve is assembled in the cylinder head. The engine further includes a second spark plug, which is assembled in the sleeve and installed in the second mounting hole.

2. The engine with multiple ignition devices as claimed in claim 1, characterized in that: The combined seat surface is an annular structure.

3. The engine with multiple ignition devices as claimed in claim 1, characterized in that: When viewed from a direction perpendicular to both the axis of the camshaft and the axis of the cylinder, the first spark plug does not overlap with the camshaft, and the second spark plug overlaps with the camshaft.

4. The engine with multiple ignition devices as claimed in claim 1, characterized in that: When viewed from the axial direction of the camshaft, the sleeve overlaps with the coupling seat surface.

5. The engine with multiple ignition devices as claimed in claim 1, characterized in that: When viewed from the axial direction of the cylinder, the through hole overlaps with the coupling seat surface.

6. The engine with multiple ignition devices as claimed in claim 1, characterized in that: A sealing member is arranged between the cylinder head cover and the sleeve to seal the through hole.

7. The engine with multiple ignition devices as claimed in claim 1, characterized in that: The second end of the sleeve is fixed to the cylinder head in a tight fit manner.

8. The engine with multiple ignition devices as claimed in claim 1, characterized in that: Observing from the combustion chamber toward the axial direction of the cylinder, the axis of the intake valve and the axis of the second spark plug, or the axis of the exhaust valve and the axis of the second spark plug, are respectively arranged on both sides of the first center line of the combustion chamber.

9. The engine with multiple ignition devices as claimed in claim 1, characterized in that: Observing from the combustion chamber toward the axial direction of the cylinder, the axis of the intake valve and the axis of the second spark plug, or the axis of the exhaust valve and the axis of the second spark plug, are respectively arranged on both sides of the second center line of the combustion chamber.

10. The engine with multiple ignition devices as claimed in claim 1, characterized in that: The engine is a water-cooled engine, and the cylinder head further comprises a water jacket surrounding the first mounting hole and the second mounting hole.

11. The engine with multiple ignition devices as claimed in claim 1, characterized in that: The engine is an air-cooled engine.

12. A motorcycle, comprising: A frame, comprising a head pipe, a main pipe, a bottom pipe and a tail pipe connected in sequence; a fuel tank locked to the frame; a storage box locked to the frame; and An engine, assembled on the vehicle frame, comprising a cylinder, a cylinder head assembly, a first spark plug and a cylinder head cover, the cylinder head assembly is fixedly mounted on the cylinder, comprising a cylinder head and an intake rocker arm, an exhaust rocker arm, an intake valve, an exhaust valve and a camshaft accommodated in the cylinder head, the cylinder head having a coupling seat surface, a combustion chamber, an outer wall portion and a chain chamber, the outer wall portion and the chain chamber are respectively located at opposite ends of the camshaft, the outer wall portion has a first mounting hole penetrating from the cylinder head to the combustion chamber, the first spark plug is mounted on the first mounting hole, the top end of the first spark plug is located on the outer side of the coupling seat surface when viewed from the axial direction of the cylinder, and the cylinder head cover is locked to the coupling seat surface; It is characterized in that: the cylinder head further includes a second mounting hole extending from the cylinder head to the combustion chamber and a sleeve connected to the second mounting hole. When viewed from the axial direction of the cylinder, the second mounting hole is located between the intake valve and the chain chamber or between the exhaust valve and the chain chamber, and the second mounting hole is located on the inner side of the coupling seat surface. The cylinder head cover further includes a through hole, a first end of the sleeve is passed through the through hole, and a second end of the sleeve is assembled in the cylinder head. The engine further includes a second spark plug, which is assembled in the sleeve and installed in the second mounting hole. When viewed from the side of the motorcycle, the first spark plug and the second spark plug are both arranged at the rear of the fuel tank, below a bottom surface of the storage box, and above an extension line of the bottom pipe.

13. The motorcycle according to claim 12, characterized in that: When viewed from the side of the motorcycle, the sleeve partially overlaps with the tail pipe.

14. The motorcycle according to claim 12, characterized in that: The bottom pipe is an approximately straight line segment.

15. The motorcycle according to claim 12, characterized in that: The tail pipe is an ascending curved section.

16. The motorcycle according to claim 12, characterized in that: The engine swings and rotates relative to the frame.

17. The motorcycle according to claim 12, characterized in that: The motorcycle is a scooter type motorcycle.

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