Left cover of motorcycle engine

Abstract

The utility model discloses a motorcycle engine left cover which comprises a first shell and a second shell, the first shell is provided with a first concave cavity used for containing a crankshaft assembly, and a through crankshaft installation hole is formed in the middle of the first shell. The second shell is connected to one side of the first shell, the second shell and the first shell are integrally formed, the second shell is provided with a second concave cavity, the opening direction of the second concave cavity is opposite to the opening direction of the first concave cavity, and the second concave cavity is used for containing a linkage gear assembly; a plurality of steps with different depths are arranged in the second concave cavity so as to form a first mounting cavity, a second mounting cavity and a third mounting cavity of which the hole diameters are gradually reduced, the second shell is further provided with a mounting groove for mounting a starting motor, and the mounting groove and the first mounting cavity are arranged in a staggered manner; and the distance between the axis of the second concave cavity and the axis of the mounting groove is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycles, in particular to a left cover of a motorcycle engine. Background Art

[0002] Motorcycles are two-wheeled or three-wheeled vehicles driven by gasoline engines and steered by handlebars. They are light, flexible, and fast, and are widely used for patrols, passenger and cargo transportation, etc. The engine is an important part of a motorcycle. In related technologies, in order to reduce the size of the engine and facilitate disassembly and assembly, the left cover of the engine is used as the main frame for fixing the crankshaft and gearbox. How to make the overall structure more compact is an urgent problem to be solved. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a left cover of a motorcycle engine, which can reduce the overall volume of the engine, make the structure more compact, and be more convenient to disassemble and assemble.

[0004] According to the first aspect of the present utility model, the left cover of the motorcycle engine comprises a first shell and a second shell, wherein the first shell has a first concave cavity for accommodating a crankshaft assembly, and a through crankshaft mounting hole is arranged in the middle of the first shell. The second shell is connected to one side of the first shell, and the second shell is integrally formed with the first shell, and the second shell is provided with a second concave cavity, the opening direction of the second concave cavity is opposite to the opening direction of the first concave cavity, and is used to accommodate the linkage gear assembly, and a plurality of steps of different depths are arranged in the second concave cavity to form a first mounting cavity, a second mounting cavity and a third mounting cavity with gradually decreasing apertures, and the second shell is also provided with a mounting groove for mounting a starter motor, and the mounting groove is staggered with the first mounting cavity to reduce the distance between the axis of the second concave cavity and the axis of the mounting groove.

[0005] The left cover of the motorcycle engine according to the embodiment of the utility model has at least the following beneficial effects: the first shell and the second shell are integrally formed, which not only simplifies the manufacturing process, but also significantly reduces the overall volume of the engine. The first concave cavity of the first shell is designed to accommodate the crankshaft assembly, while the second concave cavity of the second shell is used to accommodate the linkage gear assembly. This layout optimizes the space utilization inside the engine, arranges the various components more closely together, and further realizes the miniaturization of the engine. Multiple steps of different depths arranged in the second concave cavity form a first installation cavity, a second installation cavity, and a third installation cavity with gradually decreasing apertures. This design not only adapts to the installation requirements of linkage gear assemblies of different sizes and types, but also ensures the stability and accuracy of component installation by precisely controlling the size and depth of each installation cavity.

[0006] The installation grooves provided on the second housing are arranged alternately with the first installation cavity. This layout effectively reduces the distance between the axis of the second cavity and the axis of the installation groove, so that the starter motor can be installed closer to the linkage gear assembly, thereby reducing unnecessary space occupation and improving the integration of the engine. In summary, the motorcycle engine left cover proposed by the utility model realizes the reduction of the engine volume and the compactness of the structure. At the same time, the compact structure also facilitates the disassembly, assembly, repair and maintenance of the engine, reducing the maintenance cost.

[0007] According to some embodiments of the utility model, a mounting hole is further provided in the second concave cavity for mounting a driving gear, the driving gear is meshed with the linkage gear assembly, and the mounting hole is communicated with the first mounting cavity.

[0008] According to some embodiments of the present invention, the projection of the first cavity partially overlaps with the projection of the first mounting cavity, so as to reduce the distance between the axis of the first cavity and the axis of the second cavity.

[0009] According to some embodiments of the present invention, part of the first cavity is communicated with the second installation cavity.

[0010] According to some embodiments of the present invention, a positioning boss is disposed in the first cavity, the positioning boss is disposed around the crankshaft mounting hole, and the axis of the positioning boss is colinear with the axis of the crankshaft mounting hole.

[0011] According to some embodiments of the present utility model, the positioning boss is provided with a stator mounting screw hole, and the stator mounting screw hole is adjacent to the crankshaft mounting hole.

[0012] According to some embodiments of the present invention, the first shell is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs are located in the first concave cavity, and the plurality of reinforcing ribs are evenly radially arranged from the peripheral side wall of the positioning boss toward the outside.

[0013] According to some embodiments of the present utility model, a fixing rib is arranged around the periphery of the first shell and the second shell, and a plurality of fixing holes are evenly and equidistantly arranged on the fixing rib.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0016] Figure 1 It is a side cross-sectional schematic diagram of the left cover of a motorcycle engine according to an embodiment of the utility model;

[0017] Figure 2 It is a front view schematic diagram of the left cover of a motorcycle engine according to an embodiment of the utility model;

[0018] Figure 3 The figure is a schematic diagram of the inner side of the left cover of a motorcycle engine according to an embodiment of the utility model.

[0019] Figure numerals: first shell 100; first concave cavity 110; crankshaft mounting hole 120; positioning boss 130; stator mounting screw hole 131; reinforcing rib 140; fixing rib 150; fixing hole 151; second shell 200; second concave cavity 210; first mounting cavity 211; second mounting cavity 212; third mounting cavity 213; mounting groove 220; mounting hole 230. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the utility model, unless otherwise clearly defined, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meaning of the above words in the utility model in combination with the specific content of the technical solution. In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0024] Motorcycles are two-wheeled or three-wheeled vehicles driven by gasoline engines and steered by handlebars. They are light, flexible, and fast, and are widely used for patrols, passenger and cargo transportation, etc. The engine is an important part of a motorcycle. In related technologies, in order to reduce the size of the engine and facilitate disassembly and assembly, the left cover of the engine is used as the main frame for fixing the crankshaft and gearbox. How to make the overall structure more compact is an urgent problem to be solved.

[0025] For this purpose, refer to Figure 1 , Figure 2 and Figure 3, is a motorcycle engine left cover proposed by the utility model, comprising a first housing 100 and a second housing 200, the first housing 100 having a first concave cavity 110 for accommodating a crankshaft assembly, and a through crankshaft mounting hole 120 is provided in the middle of the first housing 100. The second housing 200 is connected to one side of the first housing 100, and the second housing 200 and the first housing 100 are integrally formed, and the second housing 200 is provided with a second concave cavity 210, the opening direction of the second concave cavity 210 is opposite to the opening direction of the first concave cavity 110, and is used to accommodate a linkage gear assembly, and a plurality of steps of different depths are provided in the second concave cavity 210 to form a first mounting cavity 211, a second mounting cavity 212 and a third mounting cavity 213 with gradually decreasing apertures, and the second housing 200 is also provided with a mounting groove 220 for mounting a starter motor, and the mounting groove 220 is staggered with the first mounting cavity 211 to reduce the distance between the axis of the second concave cavity 210 and the axis of the mounting groove 220. It is understandable that the integral molding of the first housing 100 and the second housing 200 not only simplifies the manufacturing process, but also significantly reduces the overall volume of the engine. The first concave cavity 110 of the first housing 100 is designed to accommodate the crankshaft assembly, while the second concave cavity 210 of the second housing 200 is used to accommodate the linkage gear assembly. This layout optimizes the space utilization inside the engine, arranges the various components more closely together, and further realizes the miniaturization of the engine. Multiple steps of different depths arranged in the second concave cavity 210 form a first installation cavity 211, a second installation cavity 212, and a third installation cavity 213 with gradually decreasing apertures. This design not only adapts to the installation requirements of linkage gear assemblies of different sizes and types, but also ensures the stability and accuracy of component installation by precisely controlling the size and depth of each installation cavity.

[0026] Reference, Figure 1 It should be noted that the installation groove 220 and the first installation cavity 211 provided on the second housing 200 are arranged in an interlaced manner. This layout effectively reduces the distance between the axis of the second cavity 210 and the axis of the installation groove 220, so that the starter motor can be installed closer to the linkage gear assembly, thereby reducing unnecessary space occupation and improving the integration of the engine. In summary, the motorcycle engine left cover proposed by the utility model realizes the reduction of the engine volume and the compactness of the structure. At the same time, the compact structure also facilitates the disassembly, assembly, repair and maintenance of the engine, reducing the maintenance cost.

[0027] Furthermore, the openings of the first cavity 110 and the second cavity 210 face oppositely, which allows the first housing 100 and the second housing 200 to form a more compact overall structure when combined. This design reduces the extra space or gap that may be required during assembly, thereby reducing the overall size of the engine.

[0028] Furthermore, the staggered layout of the first cavity 110 and the second cavity 210 also helps to reduce the height of the engine in the vertical direction. In traditional engine design, the components are usually arranged linearly, which causes the engine to occupy a large space in the vertical direction. With this staggered layout, the components can be stacked together more compactly, thereby reducing the overall height of the engine.

[0029] Furthermore, the opening direction of the mounting groove 220 is opposite to the opening direction of the second cavity 210, so that the linkage gear assembly and the starter motor can be partially staggered in layout, which not only optimizes the space utilization inside the engine, but also reduces unnecessary space waste.

[0030] Finally, this design can also help simplify the manufacturing and assembly process of the engine. Due to the more compact structure, the number of parts required may be reduced and the assembly steps may be simplified. This not only improves production efficiency but also reduces manufacturing costs.

[0031] Reference Figure 1 , Figure 2 and Figure 3 A mounting hole 230 is also provided in the second concave cavity 210 for mounting a driving gear, the driving gear is meshed with the linkage gear assembly, and the mounting hole 230 is communicated with the first mounting cavity 211 .

[0032] Reference Figure 1 , Figure 2 and Figure 3 The projection of the first concave cavity 110 partially overlaps with the projection of the first installation cavity 211 to reduce the distance between the axis of the first concave cavity 110 and the axis of the second concave cavity 210 .

[0033] Reference Figure 1 , Figure 2 and Figure 3 , part of the first concave cavity 110 is connected to the second installation cavity 212 .

[0034] Reference Figure 1 , Figure 2 and Figure 3 A positioning boss 130 is disposed in the first cavity 110. The positioning boss 130 is disposed around the crankshaft mounting hole 120, and the axis of the positioning boss 130 is colinear with the axis of the crankshaft mounting hole 120. By disposing the positioning boss 130 and surrounding the crankshaft mounting hole 120, it is possible to ensure that the crankshaft assembly can be accurately positioned during assembly. This design avoids position deviation during assembly, improves assembly accuracy, and thus ensures the stability and reliability of the engine.

[0035] Reference Figure 1 , Figure 2 and Figure 3The positioning boss 130 is provided with a stator mounting screw hole 131, and the stator mounting screw hole 131 is adjacent to the crankshaft mounting hole 120. The stator mounting screw hole 131 is provided on the positioning boss 130, so that the stator can be conveniently installed on the left cover. This design reduces the number of additional installation steps and parts, and simplifies the overall structure of the engine. The layout of the stator mounting screw hole 131 adjacent to the crankshaft mounting hole 120 further optimizes the space utilization inside the engine. Further reduce the volume of the engine.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The first housing 100 is provided with a plurality of reinforcing ribs 140, which are located in the first concave cavity 110, and the plurality of reinforcing ribs 140 are evenly radially arranged from the peripheral side wall of the positioning boss 130 toward the outside. The radial arrangement of the reinforcing ribs 140 can reasonably disperse and transfer stress, so that the left cover can distribute stress more evenly when subjected to external force, reducing the phenomenon of stress concentration. This helps to extend the service life of the left cover and reduce the risk of failure caused by stress concentration.

[0037] Reference Figure 1 , Figure 2 and Figure 3 A fixing rib 150 is arranged around the periphery of the first housing 100 and the second housing 200, and a plurality of fixing holes 151 are evenly and evenly arranged on the fixing rib 150. The arrangement of the fixing rib 150 and the fixing holes 151 simplifies the installation and fixing process of the left cover of the engine. By fixing the left cover to the engine with bolts or other fasteners, a tight connection and stable fixation between the left cover and the engine can be ensured. This not only improves the assembly efficiency, but also enhances the connection strength between the left cover and the engine.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A motorcycle engine left cover, characterized in that: include: A first housing has a first concave cavity for accommodating a crankshaft assembly, and a through crankshaft mounting hole is provided in the middle of the first housing; The second shell is connected to one side of the first shell. The second shell is integrally formed with the first shell. The second shell is provided with a second concave cavity. The opening direction of the second concave cavity is opposite to the opening direction of the first concave cavity, and is used to accommodate the linkage gear assembly. The second concave cavity is provided with a plurality of steps of different depths to form a first mounting cavity, a second mounting cavity and a third mounting cavity with gradually decreasing apertures. The second shell is also provided with a mounting groove for installing a starter motor. The mounting groove is staggered with the first mounting cavity to reduce the distance between the axis of the second concave cavity and the axis of the mounting groove.

2. The motorcycle engine left cover according to claim 1, characterized in that: The second concave cavity is also provided with a mounting hole for mounting a driving gear, the driving gear is meshed with the linkage gear assembly, and the mounting hole is communicated with the first mounting cavity.

3. The motorcycle engine left cover according to claim 1, characterized in that: The projection of the first cavity partially overlaps with the projection of the first mounting cavity to reduce the distance between the axis of the first cavity and the axis of the second cavity.

4. The motorcycle engine left cover according to claim 3, characterized in that: A portion of the first concave cavity is communicated with the second mounting cavity.

5. The motorcycle engine left cover according to claim 1, characterized in that: A positioning boss is arranged in the first cavity, the positioning boss is arranged around the crankshaft mounting hole, and the axis of the positioning boss is colinear with the axis of the crankshaft mounting hole.

6. The motorcycle engine left cover according to claim 5, characterized in that: The positioning boss is provided with a stator mounting screw hole, and the stator mounting screw hole is adjacent to the crankshaft mounting hole.

7. The motorcycle engine left cover according to claim 5, characterized in that: The first shell is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs are located in the first concave cavity, and the plurality of reinforcing ribs are evenly radially arranged from the peripheral side wall of the positioning boss toward the outside.

8. The motorcycle engine left cover according to claim 1, characterized in that: A fixing rib is arranged around the periphery of the first shell and the second shell, and a plurality of fixing holes are evenly and equidistantly arranged on the fixing rib.

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