Engine timing system, methanol engine and vehicle

Abstract

The utility model discloses an engine timing system, a methanol engine and a vehicle. The engine timing system comprises a timing gear, a first timing gear and a second timing gear, the idle gear set is in meshing transmission with the timing gear and comprises a transition gear; the air inlet cam shaft gear and the air outlet cam shaft gear are both in meshing transmission with the transition gear. A first gear shaft is fixed to the air cylinder cover, the transition gear is rotationally connected to the first gear shaft, and a compensation cushion block is arranged in a gap between the transition gear and the air cylinder cover. An existing cylinder cover is not improved in order to adapt to the structural size of the transition gear, the compensation cushion block is arranged in the gap between the transition gear and the cylinder cover, on the premise that the structure of the cylinder cover is simplified, the assembly error between the cylinder cover and the transition gear can be accurately compensated through the compensation cushion block, and the assembly efficiency is improved. Reliable and stable installation of the transition gear is ensured; a sealing oil film is formed between the compensation cushion block and the transition gear, and it is guaranteed that a lubricating oil film formed between the transition gear and the first gear shaft cannot leak.

Description

Technical Field

[0001] The present application relates to the technical field of timing systems, and more specifically to an engine timing system, a methanol engine including the engine timing system, and a vehicle including the methanol engine. Background Art

[0002] The spark-ignition methanol engine uses a dual overhead camshaft and a roof-type cylinder head combustion chamber structure. Due to the large valve angle, the structural size requirements of the transition gear are larger to achieve the requirement of simultaneously driving the intake camshaft and the exhaust camshaft; therefore, the structural requirements for the transition gear assembly at the cylinder head also become more complex. Utility Model Content

[0003] In view of this, the present application provides an engine timing system, a methanol engine including the above-mentioned engine timing system, and a vehicle including the above-mentioned methanol engine, which solves the problem of relatively complex structural requirements at the cylinder head assembly transition gear.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] An engine timing system comprising:

[0006] Timing gear;

[0007] an idler gear set meshing with the timing gear for transmission, comprising a transition gear;

[0008] The intake camshaft gear and the exhaust camshaft gear are both meshed with the transition gear for transmission;

[0009] Wherein, a first gear shaft is fixed to the cylinder head, the transition gear is rotatably connected to the first gear shaft, and a compensation pad is provided in the gap between the transition gear and the cylinder head.

[0010] Optionally, in the above engine timing system, the transition gear is rotatably connected to the first gear shaft via a gear bushing;

[0011] Wherein, the compensation pad is sleeved on the first gear shaft, and the outer diameter of the compensation pad is larger than the outer diameter of the gear bushing.

[0012] Optionally, in the above engine timing system,

[0013] The difference between the outer diameter of the compensation pad and the outer diameter of the gear bushing is 6mm-10mm;

[0014] and / or,

[0015] The thickness of the compensation pad is 3mm-5mm.

[0016] Optionally, in the above engine timing system, the idler gear set includes a first idler gear provided on the cylinder head and a second idler gear provided on the cylinder block;

[0017] The first idle gear can be position-adjusted on the cylinder head, and / or the second idle gear can be position-adjusted on the cylinder block, so as to adjust the assembly clearance between the first idle gear and the second idle gear;

[0018] The first idle gear is meshed with the transition gear for transmission, and the second idle gear is meshed with the timing gear or with the timing gear through a transmission gear for transmission.

[0019] Optionally, in the above engine timing system, the idler gear set further includes:

[0020] A second gear shaft, used for mounting the first idler gear, and having an eccentric hole;

[0021] a positioning pin, passing through the eccentric hole and connected to the cylinder head;

[0022] The second gear shaft is capable of rotating around the positioning pin to adjust the assembly gap between the first idle gear and the second idle gear.

[0023] Optionally, in the above engine timing system,

[0024] The positioning pin is located on the center line connecting the first idle gear and the transition gear;

[0025] and / or,

[0026] The idler gear set further includes a first locking member and a pressure plate, wherein the pressure plate covers at least a portion of the positioning pin; the first locking member passes through the pressure plate and the second gear shaft in sequence to fix the two to the cylinder head.

[0027] Optionally, in the above engine timing system, the transmission gear is a double-row idler gear, and the double-row idler gear includes a coaxial large gear and a small gear; the large gear is meshed with the timing gear for transmission, and the small gear is meshed with the second idler gear for transmission;

[0028] Wherein, the engine timing system includes a lubricating oil pump gear, which is meshed with the large gear to provide power for the lubricating oil pump.

[0029] Optionally, in the above engine timing system, the engine timing system includes:

[0030] A methanol pump idler gear meshing with the timing gear for transmission;

[0031] The methanol pump gear is meshed with the methanol pump idler gear to provide power to the methanol pump.

[0032] A methanol engine comprises the engine timing system as described above.

[0033] A vehicle comprises the methanol engine as described above.

[0034] In the engine timing system, methanol engine and vehicle provided by the present application, the intake camshaft and the exhaust camshaft are driven simultaneously by a transition gear with a larger structural size; on this basis, the present application does not improve the existing cylinder head in order to adapt to the structural size of the transition gear, but sets a compensation pad in the gap between the transition gear and the cylinder head. On the premise of simplifying the cylinder head structure, the compensation pad can accurately compensate for the assembly error between the cylinder head and the transition gear, ensuring the reliable and stable installation of the transition gear; moreover, there is no need to improve the lubrication oil channel of the cylinder head. During the operation of the transition gear, lubrication and pressure are built up, and a sealing oil film is formed between the compensation pad and the transition gear, ensuring that the lubricating oil film formed between the transition gear and the first gear shaft will not leak; at the same time, due to the simplification of the cylinder head structure, the upper end face of the cylinder head where the transition gear is installed is ensured to be in the same plane as other positions, which reduces the machining difficulty of the upper end face of the cylinder head and ensures the sealing requirements between the upper end face of the cylinder head and the valve cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0036] Figure 1 This is a schematic structural diagram of the engine timing system of this application;

[0037] Figure 2 This is a cross-sectional view of the transition gear of this application.

[0038] Figure 1-Figure 2 middle:

[0039] 1. Timing gear; 2. Idle gear set; 3. Intake camshaft gear; 4. Exhaust camshaft gear; 5. Cylinder head; 6. Cylinder block; 7. Lubricating oil pump gear; 8. Methanol pump idler gear; 9. Methanol pump gear;

[0040] 211, transition gear; 212, first gear shaft; 213, compensation pad; 214, gear bushing; 215, second locking member;

[0041] 221, first idler gear; 222, second gear shaft; 223, positioning pin; 224, first locking member; 225, pressure plate;

[0042] 231, second idler gear;

[0043] 241. Double row idler gears. DETAILED DESCRIPTION

[0044] The present application provides an engine timing system, a methanol engine including the engine timing system, and a vehicle including the methanol engine.

[0045] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] like Figure 1-2 As shown, an engine timing system includes a timing gear 1, an idler gear set 2, an intake camshaft gear 3, and an exhaust camshaft gear 4. The idler gear set 2 meshes with the timing gear 1 and includes a transition gear 211. Both the intake camshaft gear 3 and the exhaust camshaft gear 4 mesh with the transition gear 211. The idler gear set 2 also includes a first gear shaft 212, which is fixed to the cylinder head 5. The transition gear 211 is sleeved on the first gear shaft 212 and is rotatably connected to the first gear shaft 212. A compensation pad 213 is provided in the gap between the transition gear 211 and the cylinder head 5.

[0047] It should be noted that the timing gear 1 is drivingly connected to the cylinder crankshaft, providing driving force for the engine timing system. The intake camshaft gear 3 is drivingly connected to the intake camshaft, and the exhaust camshaft gear 4 is drivingly connected to the exhaust camshaft. The intake and exhaust camshafts are dual overhead camshafts, located above the roof-type cylinder head, respectively controlling the cylinder's intake and exhaust valves. The transition gear 211 is located on the front face of the cylinder head 5.

[0048] The engine utilizes a dual overhead camshaft and a roof-shaped cylinder head combustion chamber structure. Due to the large valve angle, the transition gear 211 requires a larger structural dimension. This allows the transition gear 211 to simultaneously drive the intake camshaft gear 3 and the exhaust camshaft gear 4 to rotate synchronously, thereby achieving the requirement of driving the intake and exhaust camshafts to rotate synchronously. Based on this, the present application does not modify the structure of the cylinder head 5 in which the transition gear 211 is assembled to accommodate the structural dimensions of the transition gear 211. Instead, a compensating block 213 is provided within the gap between the transition gear 211 and the cylinder head 5. While simplifying the cylinder head structure, the compensating block 213 accurately compensates for any assembly errors between the cylinder head 5 and the transition gear 211, ensuring reliable and stable installation of the transition gear 211. Furthermore, there's no need to modify the lubricating oil passages of cylinder head 5. During the operation of transition gear 211, lubrication and pressure buildup occur, forming a sealing oil film between compensation pad 213 and transition gear 211, ensuring that the lubricating oil film formed between transition gear 211 and first gear shaft 212 doesn't leak. Furthermore, the simplified structure of cylinder head 5 ensures that the upper end surface of cylinder head 5 where transition gear 211 is mounted is flush with other locations, reducing the difficulty of machining the upper end surface of cylinder head 5 and ensuring the required seal between the upper end surface of cylinder head 5 and the valve cover.

[0049] Please see the attached Figure 2 In some embodiments of the present application, the transition gear 211 is rotatably connected to the first gear shaft 212 via the gear bushing 214 . The compensation pad 213 is sleeved on the first gear shaft 212 , and the outer diameter of the compensation pad 213 is larger than the outer diameter of the gear bushing 214 .

[0050] The gear bushing 214 avoids friction damage caused by the transition gear 211 rotating relative to the first gear shaft 212, thereby extending the service life of the transition gear 211. The gear bushing 214 is a replaceable component, which is easy to maintain and replace, and improves the cost-effectiveness of component repair.

[0051] The outer diameter of the compensation pad 213 is larger than the outer diameter of the gear bushing 214, so that the compensation pad 213 has a sufficiently large size to seal the gap between the transition gear 211 and the first gear shaft 212, thereby preventing the lubricating oil film formed between the transition gear 211 and the first gear shaft 212 from leaking.

[0052] In certain embodiments of the present application, the difference between the outer diameter of the compensation pad 213 and the outer diameter of the gear bushing 214 is 6mm-10mm; for example, the difference between the two can be any one of 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm.

[0053] Furthermore, the compensation pad 213 is a steel disc-shaped structure. The outer diameter of the compensation pad 213 is the outer diameter of the compensation pad 213 ; the outer diameter of the gear bushing 214 is the outer diameter of the gear bushing 214 .

[0054] In some embodiments, the thickness of the compensation block 213 is 3 mm-5 mm; for example, the thickness of the compensation block 213 is any one of 3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm.

[0055] As described above, the size of the compensation pad 213 can be limited, ensuring that the compensation pad 213 can prevent the lubricating oil film formed between the transition gear 211 and the first gear shaft 212 from leaking, while avoiding the waste of consumables and processing difficulty caused by the size and thickness of the compensation pad 213 being too large.

[0056] In some embodiments, a first mounting hole is defined on the first gear shaft 212, a second mounting hole is defined on the compensating block 213 at a position opposite the first mounting hole, and a third mounting hole is defined on the front face of the cylinder head 5, opposite the first mounting hole. A second locking member 215 is sequentially inserted through the first, second, and third mounting holes to secure the first gear shaft 212 and the compensating block 213 to the front face of the cylinder head 5.

[0057] Furthermore, the second locking member 215 is a fastening bolt or a fastening screw.

[0058] As described above, the detachable connection between the first gear shaft 212 and the compensation pad 213 at the front end surface of the cylinder head 5 is achieved, and the disassembly, replacement and maintenance of the first gear shaft 212 and the compensation pad 213 are more convenient and quick.

[0059] Furthermore, a blocking edge is formed on the outer periphery of the end surface of the first gear shaft 212 away from the cylinder head 5 to axially limit the transition gear 211 to the first gear shaft 212 .

[0060] Please see the attached Figure 1 In certain embodiments of the present application, the idler gear set 2 further includes a first idler gear 221 and a second idler gear 231. The first idler gear 221 is disposed on the front end face of the cylinder head 5, and the second idler gear 231 is disposed on the front end face of the cylinder block 6. The first idler gear 221 can be positioned at the front end face of the cylinder head 5, and / or the second idler gear 231 can be positioned at the front end face of the cylinder block 6; as described above, the assembly clearance between the first idler gear 221 and the second idler gear 231 can be adjusted.

[0061] It should be noted that when the idler gear set 2 includes the transition gear 211, the first idler gear 221, and the second idler gear 231, the timing gear 1 meshes with the second idler gear 231, the second idler gear 231 meshes with the first idler gear 221, and the first idler gear 221 meshes with the transition gear 211. When the idler gear set 2 includes the transition gear 211, the first idler gear 221, the second idler gear 231, and a transmission gear, the timing gear 1 meshes with the transmission gear, the transmission gear meshes with the second idler gear 231, the second idler gear 231 meshes with the first idler gear 221, and the first idler gear 221 meshes with the transition gear 211; the transmission gear includes a single gear, or includes multiple gears that mesh and / or coaxially drive.

[0062] The engine timing system of the present application adopts a gear transmission, which transmits the driving force of the timing gear 1 to the intake camshaft gear 3 and the exhaust camshaft gear 4 simultaneously through the idler gear set 2. The first idler gear 221 in the idler gear set 2 is assembled on the cylinder head 5, and the second idler gear 231 is assembled on the cylinder block 6. At least one of the first idler gear 221 and the second idler gear 231 is configured to be position-adjustable. As described above, the assembly gap between the first idler gear 221 and the second idler gear 231 can be flexibly adjusted to avoid large assembly errors caused by the two being respectively arranged on the cylinder head 5 and the cylinder block 6, thereby improving the meshing accuracy of the first idler gear 221 and the second idler gear 231 and reducing the noise generated during the operation of the gears.

[0063] In certain embodiments of the present application, the position of the first idler gear 221 can be adjusted on the cylinder head 5. Specifically, the idler gear assembly 2 includes a second gear shaft 222 and a locating pin 223. The second gear shaft 222 is used to mount the first idler gear 221 and has an eccentric hole. The locating pin 223 extends through the eccentric hole and connects to the cylinder head 5. The second gear shaft 222 can rotate about the locating pin 223 to adjust the assembly clearance between the first idler gear 221 and the second idler gear 231.

[0064] It should be noted that a positioning hole is provided on the front end surface of the cylinder head 5 , which is opposite to the eccentric hole. The positioning pin 223 passes through the eccentric hole and the positioning hole in sequence to rotatably connect the second gear shaft 222 to the cylinder head 5 .

[0065] As described above, the position adjustment of the second gear shaft 222 together with the first idle gear 221 on the cylinder head 5 is realized, thereby realizing the adjustment of the assembly gap between the first idle gear 221 and the second idle gear 231. The structure is simple, easy to produce and process, and the adjustment is very convenient and fast.

[0066] In certain embodiments of the present application, the positioning pin 223 is located on a center line connecting the first idle gear 221 and the transition gear 211 .

[0067] As mentioned above, when the second gear shaft 222 rotates together with the first idle gear 221 around the positioning pin 223, since the rotation angle is very small and the rotation point is located on the center line between the first idle gear 221 and the transition gear 211, the impact on the center distance between the first idle gear 221 and the transition gear 211 during the above rotation process is small enough to be negligible, while the impact on the center distance between the first idle gear 221 and the second idle gear 231 is very large. Therefore, under the premise of ensuring that the assembly clearance between the first idle gear 221 and the transition gear 211 is not affected, the assembly clearance between the first idle gear 221 and the second idle gear 231 can be adjusted to a large extent.

[0068] In some embodiments, the idler gear assembly 2 includes a first locking member 224. A locking hole is defined in the second gear shaft 222, and a fixing hole is defined in the cylinder head 5. The first locking member 224 is passed through the locking hole and the fixing hole in sequence to secure the second gear shaft 222 to the cylinder head 5.

[0069] The first locking member 224 is a fastening bolt or a fastening screw.

[0070] It should be noted that there is a gap between the first locking member 224 and the fixing hole of the cylinder head 5; since the rotation angle of the second gear shaft 222 relative to the positioning pin 223 is very small, the gap between the first locking member 224 and the fixing hole provides freedom for the rotation of the second gear shaft 222.

[0071] When it is necessary to adjust the assembly clearance between the first idle gear 221 and the second idle gear 231, loosen the first locking piece 224; then rotate the second gear shaft 222 around the positioning pin 223, and the rotation of the second gear shaft 222 drives the synchronous rotation of the first idle gear 221; after rotating into place, the positioning is completed with the assistance of the matching tooling; finally, tighten the first locking piece 224 to fix the second gear shaft 222 on the cylinder head 5.

[0072] In some embodiments, the idler gear assembly 2 includes a pressure plate 225 that covers at least a portion of the locating pin 223. A pressure plate hole is defined in the pressure plate 225. A first locking member 224 passes through the pressure plate hole of the pressure plate 225, the locking hole of the second gear shaft 222, and the fixing hole of the cylinder head 5 in sequence to secure the pressure plate 225 and the second gear shaft 222 to the cylinder head 5. Simultaneously, the pressure plate 225 axially limits the locating pin 223, preventing it from disengaging from the locating hole of the cylinder head 5 and the eccentric hole of the second gear shaft 222.

[0073] In certain embodiments of the present application, the transmission gear is a dual-row idler gear 241, which includes a coaxial large gear and a small gear. The large gear meshes with the timing gear 1, and the small gear meshes with the second idler gear 231. The engine timing system includes a lubricating oil pump gear 7, which meshes with the large gear to provide power to the lubricating oil pump.

[0074] By setting up the double-row idler gear 241, when the timing gear 1 rotates, the large gear and the small gear of the double-row idler gear 241 are synchronously driven, thereby realizing the synchronous driving of the lubricating oil pump gear 7, and the intake camshaft gear 3 and the exhaust camshaft gear 4.

[0075] The lubricating oil pump transports lubricating oil from the lubricating oil tank to the lubricating oil circuit of the engine to lubricate and build pressure during the rotation of each gear, forming a lubricating oil film and reducing friction between each gear and each gear shaft.

[0076] In certain embodiments of the present application, the engine timing system includes a methanol pump idler gear 8 and a methanol pump gear 9. The methanol pump idler gear 8 is meshed with the timing gear 1. The methanol pump gear 9 is meshed with the methanol pump idler gear 8 to provide power to the methanol pump.

[0077] A methanol pump delivers methanol fuel from the methanol fuel tank to the engine's fuel injection system. The methanol fuel is burned in the cylinders, propelling the vehicle. Methanol fuel combustion produces relatively low exhaust emissions, particularly carbon dioxide emissions, far lower than those of conventional gasoline engines. Methanol fuel can be produced from a variety of feedstocks, including natural gas and biomass, helping to reduce dependence on oil. Furthermore, methanol fuel has a higher octane rating, which reduces knock and improves engine performance.

[0078] In summary, the present application also provides a methanol engine, which includes the engine timing system as described above.

[0079] Since the methanol engine includes the engine timing system described above, the beneficial effects of the methanol engine brought about by the engine timing system can be found above and will not be repeated here.

[0080] In summary, the present application also provides a vehicle, which includes the methanol engine as described above.

[0081] Since the vehicle includes the methanol engine described above, and the methanol engine includes the engine timing system described above, the beneficial effects of the vehicle brought about by the engine timing system can be found above and will not be repeated here.

[0082] The components and devices involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0083] It should also be noted that in the device of the present application, each component can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as equivalent solutions of the present application.

[0084] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0085] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0086] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An engine timing system, characterized in that: include: Timing gear (1); An idler gear set (2) meshing with the timing gear (1) for transmission, comprising a transition gear (211); The intake camshaft gear (3) and the exhaust camshaft gear (4) are both meshed with the transition gear (211) for transmission; A first gear shaft (212) is fixed to the cylinder head (5), the transition gear (211) is rotatably connected to the first gear shaft (212), and a compensation pad (213) is provided in a gap between the transition gear (211) and the cylinder head (5).

2. The engine timing system according to claim 1, characterized in that: The transition gear (211) is rotatably connected to the first gear shaft (212) via a gear bushing (214); The compensation pad (213) is sleeved on the first gear shaft (212), and the outer diameter of the compensation pad (213) is greater than the outer diameter of the gear bushing (214).

3. The engine timing system according to claim 2, characterized in that: The difference between the outer diameter of the compensation pad (213) and the outer diameter of the gear bushing (214) is 6 mm to 10 mm; and / or, The thickness of the compensation pad (213) is 3mm-5mm.

4. The engine timing system according to claim 1, characterized in that The idle gear set (2) comprises a first idle gear (221) provided on the cylinder head (5) and a second idle gear (231) provided on the cylinder body (6); The first idle gear (221) can be position-adjusted on the cylinder head (5), and / or the second idle gear (231) can be position-adjusted on the cylinder body (6) to adjust an assembly gap between the first idle gear (221) and the second idle gear (231); The first idle gear (221) is meshed with the transition gear (211) for transmission, and the second idle gear (231) is meshed with the timing gear (1) or with the timing gear (1) through a transmission gear for transmission.

5. The engine timing system according to claim 4, characterized in that: The idler gear set (2) further comprises: A second gear shaft (222), used for mounting the first idler gear (221), and having an eccentric hole; A positioning pin (223) is inserted into the eccentric hole and connected to the cylinder head (5); The second gear shaft (222) is capable of rotating around the positioning pin (223) to adjust the assembly gap between the first idle gear (221) and the second idle gear (231).

6. The engine timing system according to claim 5, characterized in that: The positioning pin (223) is located on a center line connecting the first idle gear (221) and the transition gear (211); and / or, The idler gear set (2) further includes a first locking member (224) and a pressure plate (225), wherein the pressure plate (225) covers at least a portion of the positioning pin (223); the first locking member (224) passes through the pressure plate (225) and the second gear shaft (222) in sequence, thereby fixing the two to the cylinder head (5).

7. The engine timing system according to claim 4, characterized in that The transmission gear is a double-row idler gear (241), and the double-row idler gear (241) includes a coaxial large gear and a small gear; the large gear is meshed with the timing gear (1) for transmission, and the small gear is meshed with the second idler gear (231) for transmission; The engine timing system includes a lubricating oil pump gear (7), which is meshed with the large gear to provide power for the lubricating oil pump.

8. The engine timing system according to claim 1, characterized in that The engine timing system includes: A methanol pump idler gear (8) meshes with the timing gear (1) for transmission; The methanol pump gear (9) is meshed with the methanol pump idler gear (8) to provide power for the methanol pump.

9. A methanol engine, characterized in that: Comprising the engine timing system according to any one of claims 1-8.

10. A vehicle, characterized in that: Comprising a methanol engine as claimed in claim 9.

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