Engine structure and diesel engine

Abstract

The utility model provides an engine structure and a diesel engine, and relates to the technical field of engines, the engine structure comprises an engine body, and a crankshaft gear, a camshaft gear, a fuel injection pump gear and a plurality of idle gears which are arranged on the engine body, and the camshaft gear and the fuel injection pump gear are respectively engaged with the crankshaft gear through the plurality of idle gears. A first mark is arranged on one of the machine body and the crankshaft gear, and a second mark is arranged on the other one. A third mark is arranged on one of the machine body and the cam shaft gear, and a fourth mark is arranged on the other one. A fifth mark is arranged on one of the machine body and the fuel injection pump gear, and a sixth mark is arranged on the other one. The first mark is used for being aligned with the second mark, the third mark is used for being aligned with the fourth mark, and the fifth mark is used for being aligned with the sixth mark. According to the engine structure, after the crankshaft gear, the camshaft gear and the fuel injection pump gear are positioned on the engine body, the idle gear is assembled, the assembling difficulty can be reduced, and the assembling efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine structure and a diesel engine. Background Art

[0002] In the engine transmission system, the timing gear system is used to ensure the valve timing when the engine is running, so that the opening and closing of the intake and exhaust valves are consistent with the piston movement. At present, the timing gear system of a diesel engine generally consists of a crankshaft gear, a camshaft gear, an injection pump gear, and multiple idler gears. The camshaft gear and the injection pump gear are respectively meshed with the crankshaft gear through the idler gear.

[0003] In order to ensure the transmission ratio between the crankshaft gear, camshaft gear and injection pump gear, in the related art, the alignment position is marked between each gear and the idler gear so as to ensure the timing of valve distribution and injection during assembly.

[0004] However, each gear rotates relative to the machine body, so that the marks between adjacent gears and the idler gear cannot be guaranteed to be completely aligned, the adjustment time is long, the assembly difficulty is increased, and the assembly efficiency is affected. Utility Model Content

[0005] In view of the above problems, an embodiment of the present application provides an engine structure and a diesel engine to solve the problem that in the assembly of the existing engine timing gear system, the marks between adjacent gears and the idler gear cannot be guaranteed to be completely aligned, the adjustment time is long, the assembly difficulty is increased, and the assembly efficiency is affected.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides an engine structure, including an engine body, and a crankshaft gear, a camshaft gear, a fuel injection pump gear, and a plurality of idler gears arranged on the same side of the engine body, wherein the camshaft gear and the fuel injection pump gear are respectively meshed with the crankshaft gear through the plurality of idler gears.

[0008] A first mark is provided on one of the engine body and the crankshaft gear, and a second mark is provided on the other;

[0009] A third mark is provided on one of the engine body and the camshaft gear, and a fourth mark is provided on the other;

[0010] A fifth mark is provided on one of the engine body and the fuel injection pump gear, and a sixth mark is provided on the other;

[0011] The first mark is used to align with the second mark, and the third mark is used to align with the fourth mark, and the fifth mark is used to align with the sixth mark.

[0012] In a possible implementation manner, at least one of the first mark, the second mark, the third mark, the fourth mark, the fifth mark, and the sixth mark is a scribe line.

[0013] In a possible implementation, the scoring lines include printed scoring lines, protrusions, grooves or stickers.

[0014] In a possible implementation, the engraved line on at least one of the crankshaft gear, the camshaft gear and the fuel injection pump gear is located on a side thereof facing away from the engine body.

[0015] In a possible implementation, at least one limit member is further included. When the first mark is aligned with the second mark, the third mark is aligned with the fourth mark, and the fifth mark is aligned with the sixth mark, at least one of the crankshaft gear, camshaft gear and injection pump gear is connected to the body through the limit member to limit the rotation of the crankshaft gear, the camshaft gear or the injection pump gear.

[0016] In a possible implementation, at least one of the crankshaft gear, the camshaft gear and the fuel injection pump gear is provided with a through hole matching the limiter;

[0017] The limiting member is provided with a first plug-in portion, the body is provided with a second plug-in portion matching the first plug-in portion, and the second plug-in portion corresponds to the crankshaft gear, the camshaft gear or the injection pump gear;

[0018] When the first mark is aligned with the second mark, the third mark is aligned with the fourth mark, and the fifth mark is aligned with the sixth mark, the limit member is inserted through the through hole on the crankshaft gear, the camshaft gear or the injection pump gear, and the first plug-in part is plugged into the corresponding second plug-in part.

[0019] In a possible implementation, one of the first plug-in portion and the second plug-in portion is a plug, and the other is a socket matching the plug;

[0020] When the first mark is aligned with the second mark, the third mark is aligned with the fourth mark, and the fifth mark is aligned with the sixth mark, the through hole is aligned with the second plug-in portion, and the plug is plugged into the socket.

[0021] In a possible implementation, the machine body includes a cylinder body, and the first mark or the second mark is located on the cylinder body.

[0022] In a possible implementation, the engine body further includes a cylinder head connected to the cylinder block, a side of the cylinder head facing the camshaft gear has a camshaft mounting seat, and the third mark or the fourth mark is located on the camshaft mounting seat.

[0023] In a possible implementation, the engine body further includes a fuel injection pump body connected to the cylinder body, the fuel injection pump body has a flange on one side facing the fuel injection pump gear, and the fifth mark or the sixth mark is located on the flange.

[0024] In a second aspect, an embodiment of the present application further provides a diesel engine, comprising any engine structure provided in the first aspect above.

[0025] The engine structure and diesel engine provided by the embodiment of the present application include a body and a crankshaft gear, a camshaft gear, a fuel injection pump gear and a plurality of idler gears arranged on the same side of the body, and the camshaft gear and the fuel injection pump gear are respectively meshed with the crankshaft gear through a plurality of idler gears. A first mark is provided on one of the body and the crankshaft gear, and a second mark is provided on the other, and the first mark is aligned with the second mark to determine the orientation of the crankshaft gear relative to the body. A third mark is provided on one of the body and the camshaft gear, and a fourth mark is provided on the other, and the third mark is aligned with the fourth mark to determine the orientation of the camshaft gear relative to the body. A fifth mark is provided on one of the body and the fuel injection pump gear, and a sixth mark is provided on the other, and the fifth mark is aligned with the sixth mark to determine the orientation of the fuel injection pump gear relative to the body. By aligning the first mark with the second mark, the third mark with the fourth mark, and the fifth mark with the sixth mark, and positioning the crankshaft gear, camshaft gear and injection pump gear on the engine body, and then assembling each idler gear, the adjustment time is shortened while ensuring the timing of valve timing and injection, and the difficulty of assembly is reduced, and the number of marking and alignment times is reduced, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A partial structural schematic diagram of an engine structure provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA section.

[0029] Description of reference numerals:

[0030] 10-body;

[0031] 11- cylinder body;

[0032] 12-cylinder head;

[0033] 13- fuel injection pump body;

[0034] 14-Camshaft mounting seat;

[0035] 15-flange;

[0036] 20-crankshaft gear;

[0037] 30-camshaft gear;

[0038] 40-injection pump gear;

[0039] 50-Idler;

[0040] 100 - first mark;

[0041] 200 - second mark;

[0042] 300 - third mark;

[0043] 400 - fourth mark;

[0044] 500 - fifth mark;

[0045] 600 - sixth mark;

[0046] 700-limiting parts;

[0047] 710-first plug-in portion;

[0048] 800-Through hole;

[0049] 900-second plug-in portion. DETAILED DESCRIPTION

[0050] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of methods and devices consistent with some aspects of the utility model as detailed in the attached claims.

[0051] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here, for example, can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] As mentioned in the background technology, in the process of assembling the timing gear system of a diesel engine with a single overhead camshaft and full gear drive, it is only necessary to ensure the timing of the crankshaft, camshaft and injection pump. In the related technology, there are generally multiple gear alignment marks from the crankshaft timing gear to the camshaft timing and injection pump timing gears. During assembly, since the position of each gear relative to the engine body is not completely fixed, there is an angular error in the actual alignment position of the gear relative to the engine body, so that the marks between adjacent gears and idler gears cannot be guaranteed to be completely aligned. It is necessary to rotate and adjust the position of the parts to be driven by each gear, and each mark needs to be aligned. Therefore, the adjustment time is long, which increases the difficulty of assembly and affects the assembly efficiency.

[0053] Based on the above problems, an embodiment of the present application provides an engine structure and a diesel engine, comprising an engine body and a crankshaft gear, a camshaft gear, a fuel injection pump gear and a plurality of idler gears arranged on the same side of the engine body, wherein the camshaft gear and the fuel injection pump gear are respectively meshed with the crankshaft gear through a plurality of idler gears. A first mark is provided on one of the engine body and the crankshaft gear, and a second mark is provided on the other, and the first mark is aligned with the second mark to determine the orientation of the crankshaft gear relative to the engine body. A third mark is provided on one of the engine body and the camshaft gear, and a fourth mark is provided on the other, and the third mark is aligned with the fourth mark to determine the orientation of the camshaft gear relative to the engine body. A fifth mark is provided on one of the engine body and the fuel injection pump gear, and a sixth mark is provided on the other, and the fifth mark is aligned with the sixth mark to determine the orientation of the fuel injection pump gear relative to the engine body. By aligning the first mark with the second mark, the third mark with the fourth mark, and the fifth mark with the sixth mark, and positioning the crankshaft gear, camshaft gear and injection pump gear on the engine body, and then assembling each idler gear, while ensuring the timing of valve timing and injection, the adjustment time is short, the difficulty of assembly can be reduced, and the number of marking and alignment times is reduced, thereby improving assembly efficiency.

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] The following combination Figure 1-Figure 2 The engine structure provided in the embodiment of the present application is described in detail.

[0056] First, please refer to Figure 1 As shown, an embodiment of the present application provides an engine structure, including a body 10 and a crankshaft gear 20, a camshaft gear 30, an injection pump gear 40 and a plurality of idle gears 50 arranged on the same side of the body 10, and the camshaft gear 30 and the injection pump gear 40 are respectively meshed with the crankshaft gear 20 through the plurality of idle gears 50.

[0057] A first mark 100 is provided on one of the engine body 10 and the crankshaft gear 20, and a second mark 200 is provided on the other. A third mark 300 is provided on one of the engine body 10 and the camshaft gear 30, and a fourth mark 400 is provided on the other. A fifth mark 500 is provided on one of the engine body 10 and the injection pump gear 40, and a sixth mark 600 is provided on the other.

[0058] The first mark 100 is used to align with the second mark 200 , the third mark 300 is used to align with the fourth mark 400 , and the fifth mark 500 is used to align with the sixth mark 600 .

[0059] In the present application, the engine body 10 is the main part of the engine. A diesel engine with a single overhead camshaft and full gear transmission is used as an example for explanation. At least a crankshaft, a camshaft, and an injection pump are arranged on the engine body 10. A crankshaft gear 20, a camshaft gear 30, an injection pump gear 40 and a plurality of idler gears 50 are installed on the same side of the engine body 10.

[0060] The crankshaft gear 20 is coaxially connected to the crankshaft, the camshaft gear 30 is coaxially connected to the camshaft, and the fuel injection pump gear 40 is coaxially connected to the fuel injection pump. Specifically, the idler gear 50 includes a double idler gear and a plurality of single idler gears, the double idler gear is formed by coaxially pressing a large gear and a small gear, the crankshaft gear 20 is meshed with the large gear on the double idler gear, the number of teeth on the large gear on the double idler gear is twice the number of teeth on the crankshaft gear 20, the small gear on the double idler gear is meshed with the camshaft gear 30 in turn through two single idler gears, and the small gear on the double idler gear is also meshed with the fuel injection pump gear 40 through a single idler gear.

[0061] Among them, a first mark 100 may be set on the crankshaft gear 20, and a second mark 200 may be set on the body 10 near the crankshaft gear 20. Correspondingly, a third mark 300 may be set on the camshaft gear 30, and a fourth mark 400 may be set on the body 10 near the camshaft gear 30. Correspondingly, a fifth mark 500 may be set on the fuel injection pump gear 40, and a sixth mark 600 may be set on the body 10 near the fuel injection pump gear 40. The above-mentioned marks may be engraved lines, letters, convex dots, convex strips, etc., which can be easily identified by naked eyes.

[0062] Specifically, when the engine is assembled, the first mark 100 is aligned with the second mark 200 to determine the orientation of the crankshaft gear 20 relative to the engine body 10. The third mark 300 is aligned with the fourth mark 400 to determine the orientation of the camshaft gear 30 relative to the engine body 10. The fifth mark 500 is aligned with the sixth mark 600 to determine the orientation of the fuel injection pump gear 40 relative to the engine body 10. When assembling each idler gear 50, it is only necessary to keep the orientation of the crankshaft gear 20, the camshaft gear 30 and the fuel injection pump gear 40 unchanged and align the teeth of each idler gear 50, thereby completing the assembly of the engine timing gear system.

[0063] It should be noted that when the marks are aligned, the orientation of the components they drive can be determined during the component assembly process. For example, when the first mark 100 is aligned with the second mark 200, it means that the first cylinder piston is at the top dead center position. Correspondingly, the rotation orientation of the camshaft and the injection pump is also determined.

[0064] It can be understood that compared with the operation of marking and aligning adjacent gears in the related art, the engine structure provided by the present application, by positioning the crankshaft gear 20, camshaft gear 30 and injection pump gear 40 on the engine body 10, and then assembling each idler gear 50, while ensuring the timing of valve timing and injection, shortens the adjustment time, can reduce the difficulty of assembly, reduces the number of marking and alignment times, and thus improves assembly efficiency.

[0065] In some possible designs, at least one of the first mark 100 , the second mark 200 , the third mark 300 , the fourth mark 400 , the fifth mark 500 , and the sixth mark 600 is a scribe line.

[0066] Specifically, Figure 1 As shown, the first mark 100, the second mark 200, the third mark 300, the fourth mark 400, the fifth mark 500 and the sixth mark 600 are all engraved lines, which are arranged along the radial direction of each corresponding gear, which is concise and clear. Of course, each mark can also be replaced by other types of identifications, such as letters, symbols, etc., which are not too limited in this embodiment.

[0067] Furthermore, in this embodiment, the engraved lines include printed engraved lines, protrusions, grooves or stickers, etc. For example, the engraved lines can be generated by laser printing, spray printing, etc., or by drawing lines, and the protrusions and grooves can be formed in one piece or by stickers. In this regard, there are no excessive restrictions in this embodiment.

[0068] Furthermore, in this embodiment, the engraved line on at least one of the crankshaft gear 20 , the camshaft gear 30 and the fuel injection pump gear 40 is located on a side thereof facing away from the engine body 10 .

[0069] This arrangement makes it easy for the operator to face the gears and adjust the alignment of the gears. It should be noted that since the engraved lines on the body 10 are already facing the operator, the engraved lines on the body 10 should extend in the radial direction of the crankshaft gear 20 or the camshaft gear 30 or the injection pump gear 40 beyond the outer diameter of each gear to avoid the gears blocking the engraved lines on the body 10.

[0070] In some embodiments, at least one limit member 700 is further included. When the first mark 100 is aligned with the second mark 200, the third mark 300 is aligned with the fourth mark 400, and the fifth mark 500 is aligned with the sixth mark 600, at least one of the crankshaft gear 20, the camshaft gear 30 and the fuel injection pump gear 40 is connected to the body 10 through the limit member 700 to limit the rotation of the crankshaft gear 20, the camshaft gear 30 or the fuel injection pump gear 40.

[0071] In this way, after aligning the marks on the crankshaft gear 20, the camshaft gear 30, or the fuel injection pump gear 40, the crankshaft gear 20, the camshaft gear 30, or the fuel injection pump gear 40 is fixed at the current position on the engine body 10 by the stopper 700. The stopper 700 may be a stopper rod, a stopper block, or the like.

[0072] For example, in this embodiment, at least one of the crankshaft gear 20, the camshaft gear 30 and the fuel injection pump gear 40 is provided with a through hole 800 that matches the stopper 700. The stopper 700 has a first plug-in portion 710, and the body 10 has a second plug-in portion 900 that matches the first plug-in portion 710, and the second plug-in portion 900 corresponds to the crankshaft gear 20, the camshaft gear 30 or the fuel injection pump gear 40. When the first mark 100 is aligned with the second mark 200, the third mark 300 is aligned with the fourth mark 400, and the fifth mark 500 is aligned with the sixth mark 600, the stopper 700 is inserted into the crankshaft gear 20, the camshaft gear 30 or the fuel injection pump gear 40 through the through hole 800, and the first plug-in portion 710 is plugged into the corresponding second plug-in portion 900.

[0073] The camshaft gear 30 is now used for description. Figure 1 , Figure 2As shown, a through hole 800 is provided on the camshaft gear 30, the axis of the through hole 800 is parallel to the axis of the camshaft gear 30, and the stopper 700 can be rod-shaped or strip-shaped. At least a portion of the stopper 700 matches the through hole 800 and can be inserted into the through hole 800.

[0074] The matching end of the stopper 700 has a first plug-in portion 710, and the side of the engine body 10 facing the camshaft gear 30 is provided with a second plug-in portion 900. In this way, when the engine is assembled, after the third mark 300 is aligned with the fourth mark 400, the stopper 700 is inserted into the through hole 800, and the first plug-in portion 710 is plugged with the second plug-in portion 900, so that the relative rotation of the camshaft gear 30 can be limited. After the assembly is completed, the stopper 700 can be pulled out of the through hole 800.

[0075] Correspondingly, the crankshaft gear 20 or the injection pump gear 40 and the engine body 10 can also be limited by the above method. Among them, the first plug-in portion 710 and the second plug-in portion 900 are used for plug-in limiting, which can be a matching structure of a protrusion and a concave hole.

[0076] For example, in this embodiment, one of the first plug-in portion 710 and the second plug-in portion 900 is a plug, and the other is a socket that matches the plug. When the first mark 100 is aligned with the second mark 200, the third mark 300 is aligned with the fourth mark 400, and the fifth mark 500 is aligned with the sixth mark 600, the through hole 800 is aligned with the second plug-in portion 900, and the plug is plugged into the socket.

[0077] Specifically, in one example, Figure 2 In another example, not shown in the figure, the first plug part 710 is a plug, the second plug part 900 is a jack, and the plug matches the jack, which is also convenient for plugging and unplugging.

[0078] It should be noted that when the second plug-in portion 900 is a plug, it should not interfere with the normal rotation of the crankshaft gear 20, the camshaft gear 30, or the fuel injection pump gear 40, that is, there is a sufficient gap between the crankshaft gear 20, the camshaft gear 30, or the fuel injection pump gear 40 and the engine body 10 to prevent the plug from interfering with the crankshaft gear 20, the camshaft gear 30, or the fuel injection pump gear 40. Of course, the limiting structure of the limiting member 700 between the crankshaft gear 20, the camshaft gear 30, or the fuel injection pump gear 40 and the engine body 10 can also be replaced by other types of limiting structures, as long as it is easy to disassemble and assemble without affecting the normal use of the engine. In this regard, there is no excessive restriction in this embodiment.

[0079] In some embodiments, the engine body 10 includes a cylinder block 11 and a cylinder head 12 connected to each other, and the first mark 100 or the second mark 200 is located on the cylinder block 11 and close to the crankshaft gear 20. The cylinder head 12 has a camshaft mounting seat 14 on one side facing the camshaft gear 30, and the third mark 300 or the fourth mark 400 is located on the camshaft mounting seat 14.

[0080] Specifically, if Figure 1 As shown, the first mark 100 or the second mark 200 can be marked on the machine body 10 during processing to facilitate subsequent assembly. The specific position of the first mark 100 or the second mark 200 can be determined according to actual needs and is not specifically limited in this embodiment.

[0081] Continue as Figure 1 As shown, since the outer size of the camshaft mounting seat 14 is larger than the outer diameter of the camshaft gear 30, in order to avoid the third mark 300 and the fourth mark 400 being too far apart and affecting the alignment, the third mark 300 or the fourth mark 400 is now punched on the camshaft mounting seat 14 during the processing of the parts, which is convenient for subsequent assembly. Among them, the specific position of the third mark 300 or the fourth mark 400 can be determined according to actual needs and is not specifically limited in this embodiment.

[0082] Furthermore, in this embodiment, the engine body 10 also includes a fuel injection pump body 13 connected to the cylinder body 11 , and the fuel injection pump body 13 has a flange 15 on one side facing the fuel injection pump gear 40 , and the fifth mark 500 or the sixth mark 600 is located on the flange 15 .

[0083] Combination Figure 1 , Figure 2 As shown, since the flange 15 is closest to the fuel injection pump gear 40, in order to avoid the fifth mark 500 and the sixth mark 600 being too far apart and affecting the alignment, the fifth mark 500 or the sixth mark 600 is now punched on the flange 15 during the parts processing, which is convenient for subsequent assembly. Among them, the specific position of the fifth mark 500 or the sixth mark 600 can be determined according to actual needs and is not specifically limited in this embodiment.

[0084] In a second aspect, an embodiment of the present application further provides a diesel engine, comprising the engine structure provided by any of the above embodiments.

[0085] Among them, the engine structure and principle are described in detail in the above embodiments, and this embodiment will not be repeated here.

[0086] The diesel engine provided in the embodiment of the present application is configured with an engine structure, an engine body 10, and a crankshaft gear 20, a camshaft gear 30, a fuel injection pump gear 40 and a plurality of idler gears 50 arranged on the same side of the engine body 10. The camshaft gear 30 and the fuel injection pump gear 40 are respectively meshed with the crankshaft gear 20 through the plurality of idler gears 50. A first mark 100 is provided on one of the engine body 10 and the crankshaft gear 20, and a second mark 200 is provided on the other. The first mark 100 is aligned with the second mark 200 to determine the orientation of the crankshaft gear 20 relative to the engine body 10. A third mark 300 is provided on one of the engine body 10 and the camshaft gear 30, and a fourth mark 400 is provided on the other. The third mark 300 is aligned with the fourth mark 400 to determine the orientation of the camshaft gear 30 relative to the engine body 10. A fifth mark 500 is provided on one of the engine body 10 and the fuel injection pump gear 40, and a sixth mark 600 is provided on the other. The fifth mark 500 is aligned with the sixth mark 600 to determine the orientation of the fuel injection pump gear 40 relative to the engine body 10. The first mark 100 is aligned with the second mark 200, the third mark 300 is aligned with the fourth mark 400, and the fifth mark 500 is aligned with the sixth mark 600. The orientation of the crankshaft gear 20, the camshaft gear 30 and the fuel injection pump gear 40 is determined, and then each idler gear 50 is assembled, so as to complete the assembly of the engine timing gear system. After the orientation of the crankshaft gear 20, the camshaft gear 30 and the fuel injection pump gear 40 is positioned on the engine body 10, each idler gear 50 is assembled. Under the premise of ensuring the valve timing and fuel injection timing, the adjustment time is shortened, the assembly difficulty can be reduced, and the number of markings and alignments is reduced, thereby improving the assembly efficiency.

[0087] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model disclosed herein. The present invention is intended to cover any variation, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the claims.

[0088] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An engine structure, comprising a body, and a crankshaft gear, a camshaft gear, a fuel injection pump gear and a plurality of idler gears arranged on the same side of the body, wherein the camshaft gear and the fuel injection pump gear are respectively meshed with the crankshaft gear through the plurality of idler gears, characterized in that: A first mark is provided on one of the engine body and the crankshaft gear, and a second mark is provided on the other; A third mark is provided on one of the engine body and the camshaft gear, and a fourth mark is provided on the other; A fifth mark is provided on one of the engine body and the fuel injection pump gear, and a sixth mark is provided on the other; The first mark is used to align with the second mark, the third mark is used to align with the fourth mark, and the fifth mark is used to align with the sixth mark.

2. The engine structure according to claim 1, characterized in that: At least one of the first mark, the second mark, the third mark, the fourth mark, the fifth mark, and the sixth mark is a score line.

3. The engine structure according to claim 2, characterized in that: The engraved lines include printed engraved lines, protrusions, grooves or stickers.

4. The engine structure according to claim 2, characterized in that: The engraved line on at least one of the crankshaft gear, the camshaft gear and the fuel injection pump gear is located on a side thereof facing away from the engine body.

5. The engine structure according to claim 1, characterized in that: It also includes at least one limiting member. When the first mark is aligned with the second mark, the third mark is aligned with the fourth mark, and the fifth mark is aligned with the sixth mark, at least one of the crankshaft gear, the camshaft gear and the fuel injection pump gear is connected to the body through the limiting member to limit the rotation of the crankshaft gear, the camshaft gear or the fuel injection pump gear.

6. The engine structure according to claim 5, characterized in that: At least one of the crankshaft gear, the camshaft gear and the fuel injection pump gear is provided with a through hole matching the limiting member; The limiting member has a first plug-in portion, the body has a second plug-in portion matching the first plug-in portion, and the second plug-in portion corresponds to the crankshaft gear, the camshaft gear, or the fuel injection pump gear; When the first mark is aligned with the second mark, the third mark is aligned with the fourth mark, and the fifth mark is aligned with the sixth mark, the limit member is inserted through the through hole on the crankshaft gear, the camshaft gear or the injection pump gear and the first plug-in portion is plugged into the corresponding second plug-in portion.

7. The engine structure according to claim 6, characterized in that: One of the first plug-in portion and the second plug-in portion is a plug, and the other is a socket matching the plug; When the first mark is aligned with the second mark, the third mark is aligned with the fourth mark, and the fifth mark is aligned with the sixth mark, the through hole is aligned with the second plug-in portion, and the plug is plugged into the socket.

8. The engine structure according to any one of claims 1 to 7, characterized in that: The machine body comprises a cylinder body and a cylinder head connected to each other, and the first mark or the second mark is located on the cylinder body; A camshaft mounting seat is provided on a side of the cylinder head facing the camshaft gear, and the third mark or the fourth mark is located on the camshaft mounting seat.

9. The engine structure according to claim 8, characterized in that: The engine body further comprises a fuel injection pump body connected to the cylinder body, the fuel injection pump body has a flange on one side facing the fuel injection pump gear, and the fifth mark or the sixth mark is located on the flange.

10. A diesel engine, characterized in that: Comprising the engine structure according to any one of claims 1 to 9.

Images