CN117418961A - Engine case and motorcycle - Google Patents

Abstract

The application relates to an engine case and a motorcycle. The engine case comprises a case body and a cantilever, wherein the case body comprises a first wall surface and a second wall surface which are arranged in a back-to-back mode, one end of the cantilever is connected with the case body, the other end of the cantilever extends towards a direction away from the case body and forms a connecting end for connecting a frame, the cantilever comprises a first side face, a connecting face and a top face, the first side face faces to the same side, the first side face is parallel to the first wall surface and is arranged at intervals, the connecting face is connected with the first side face and the first wall surface, a reinforcing rib is arranged between the connecting face and the first wall surface, and the reinforcing rib extends towards the case body along the connecting end. The top surface is connected first side and junction surface, and the top surface is protruding to be equipped with protruding muscle with the junction of junction surface, and protruding muscle extends to first wall from first side. The engine case reinforces the joint of the cantilever and the case body through the reinforcing ribs and the convex ribs, reduces the phenomena of cracking or breaking of the cantilever and the case body, and ensures the safety of a driver.

Description

Engine case and motorcycle

Technical Field

The application relates to the technical field of motorcycles, in particular to an engine case and a motorcycle

Background

Motorcycles are used as convenient vehicles and are widely visible in daily life of people. The engine is a power source for the running of the motorcycle, and the stable installation of the engine is a key point for the safe running of the motorcycle. The general mounting structure of the engine case of a motorcycle is generally: the front end of the machine box body is provided with the cantilever, and the machine box body is connected to the rocker arm of the frame through the cantilever, and is influenced by factors such as arrangement space, engine movement posture and the like, and the connection point of the cantilever and the cradle is usually away from the machine box body, and meanwhile, the cantilever is a main stress point of the engine, so that the cantilever needs to have enough strength.

However, in the related art, the structural strength of the cantilever is poor, and when the motorcycle runs through a wavy road section with pits or steps and the like, stress concentration is easy to occur at the root of the cantilever, so that cracking or breaking of the cantilever or a case body is easy to occur, and further, the bad phenomenon of oil leakage and the like of an engine case is caused, so that the driving safety of a user is endangered.

Disclosure of Invention

Accordingly, it is necessary to provide an engine case and a motorcycle, which solve the problem of how to increase the strength of the engine case

An engine case, comprising:

the box body comprises a first wall surface and a second wall surface which are oppositely arranged

The cantilever, one end of the cantilever is connected with the box body, the other end extends towards the direction away from the box body and forms a connecting end for connecting a frame, the cantilever comprises a first side face, a connecting face and a top face, the first side face faces to the same side with the first wall face, the first side face is parallel to the first wall face and is arranged at intervals, the connecting face is connected with the first side face and the first wall face, a reinforcing rib is arranged between the connecting face and the first wall face, and the reinforcing rib extends along the direction from the connecting end to the box body; the top surface is connected with the first side surface and the connecting surface, a convex rib is convexly arranged at the joint of the top surface and the connecting surface, and the convex rib extends from the first side surface to the first wall surface.

According to the engine case, the reinforcing ribs are arranged between the connecting surface of the cantilever and the first wall surface, the reinforcing ribs extend towards the direction of the case body along the connecting end of the cantilever, the first side surface and the first wall surface are connected through the reinforcing ribs, so that the connecting position of the connecting surface and the first wall surface, which are weak in original structure, is structurally reinforced, when the cantilever bears acting force, the reinforcing ribs can effectively resist and disperse the acting force, stress concentration of the connecting position of the connecting surface and the first wall surface is reduced, and cracking or fracture phenomenon of the connecting position of the connecting surface and the first wall surface is further reduced. Similarly, through set up protruding muscle between the top surface of cantilever and the junction to make the strengthening rib extend to first wall from first side, thereby carry out the structural reinforcement to the junction of originally structurally weak top surface and first wall, when the cantilever bears effort, the effort can be transmitted to the box along protruding muscle on, has reduced the stress concentration of the junction of top surface and junction, and then has reduced the junction of junction and first wall and has appeared fracture or fracture phenomenon. Through strengthening rib and protruding muscle cooperation, realized carrying out dual reinforcement to the junction of cantilever and box, reduced the phenomenon such as fracture or fracture appear in cantilever and box, and then reduced engine case and appear leaking oily bad problem, guaranteed driver's safety.

The technical scheme is further described as follows:

in one embodiment, a thickened portion is disposed at a position of the second wall surface corresponding to the protruding rib, and the thickened portion protrudes out of the second wall surface towards a direction away from the first wall surface.

In one embodiment, the height of the thickened portion protruding from the second wall surface is 2cm-6cm.

In one embodiment, the cantilever further comprises a second side surface opposite to the first side surface, wherein ribs are protruding from the second side surface, and the ribs extend from the connecting end to the box body.

In one embodiment, the connection surface is perpendicular to the first wall surface, and the reinforcing rib comprises an inclined surface connecting the connection surface with the first wall surface, and an included angle between the inclined surface and the first wall surface and an included angle between the inclined surface and the connection surface are all acute angles.

In one embodiment, an included angle between the inclined surface and the first wall surface is 20-70 degrees; and/or the included angle between the inclined surface and the connecting surface is 20-70 degrees.

In one embodiment, the number of the reinforcing ribs is a plurality, and the plurality of the reinforcing ribs are arranged at intervals along the connecting surface.

In one embodiment, a cambered surface is formed on one side of the convex rib away from the top surface.

In one embodiment, the first wall surface is convexly provided with a cover surface for connecting with the case cover, and the cover surface and the reinforcing rib are provided with a first interval; the joint surface and the convex ribs are provided with a second interval; and/or, the cantilever further comprises a second side surface which is arranged opposite to the first side surface, the connecting end is provided with a connecting hole penetrating through the first side surface and the second side surface, and the connecting hole is used for being in butt joint with the frame.

The application also provides a motorcycle, including frame and foretell engine case, the frame includes the support body and with the rocking arm that the support body is connected, the rocking arm is kept away from the one end of support body with the link connection of cantilever.

According to the engine case of the motorcycle, the reinforcing ribs are arranged between the connecting surface of the cantilever and the first wall surface, and extend towards the direction of the case body along the connecting end of the cantilever, and the first side surface and the first wall surface are connected by the reinforcing ribs, so that the connecting part of the connecting surface with the original weak structure and the first wall surface is structurally reinforced. Similarly, through set up protruding muscle between the top surface of cantilever and the junction to make the strengthening rib extend to first wall from first side, thereby carry out the structural reinforcement to the junction of originally structurally weak top surface and first wall, when the cantilever bears effort, the effort can be transmitted to the box along protruding muscle on, has reduced the stress concentration of the junction of top surface and junction, and then has reduced the junction of junction and first wall and has appeared fracture or fracture phenomenon. Through strengthening rib and protruding muscle cooperation, realized carrying out dual reinforcement to the junction of cantilever and box, reduced the phenomenon such as fracture or fracture appear in cantilever and box, and then reduced engine case and appear leaking oily bad problem, guaranteed driver's safety.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Moreover, the figures are not drawn to a 1:1 scale, and the relative sizes of various elements are merely exemplary in the figures, and are not necessarily drawn to true scale. In the drawings:

fig. 1 is a schematic diagram of a connection structure between an engine case and a frame of an embodiment.

Fig. 2 is a schematic structural diagram of an engine case according to an embodiment.

Fig. 3 is a partial enlarged view of a portion a shown in fig. 2.

Fig. 4 is a front view of the engine case shown in fig. 2.

Fig. 5 is a partial cross-sectional view of the engine case shown in fig. 4 at section B-B.

Fig. 6 is a rear view of the engine case shown in fig. 2.

Fig. 7 is a partial enlarged view of a portion C shown in fig. 6.

Description of the reference numerals

10. An engine case; 11. a case; 111. a first wall surface; 112. a second wall surface; 113. closing the cover surface; 12. a cantilever; 121. a first side; 122. a connection surface; 123. a top surface; 124. a connection end; 125. a connection hole; 126. a second side; 127. ribs; 13. reinforcing ribs; 131. an inclined surface; 14. convex ribs; 141. a cambered surface; 15. a thickening part.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

As described above, in the conventional engine case, when the motorcycle travels through a rough road with a pit or a step, etc., the jolt force can be transmitted to the frame through the wheels, and then transmitted from the frame to the case body of the engine along the suspension arm. The connection point of the cantilever and the cradle is usually separated from the box body under the influence of factors such as arrangement space, engine movement posture and the like. Therefore, when the jolt acting force is transmitted to the chassis body from the frame through the cantilever, the stress concentration is most easily generated at the joint of the cantilever and the chassis body, but the structural strength of the traditional cantilever is poor, and especially the joint of the cantilever and the chassis body is weakest. Therefore, the connection part of the cantilever and the case body is easy to have the problems of opening, breakage and the like, and further the case of the engine has the bad phenomenon of oil leakage and the like, so that the driving safety of a user is seriously endangered.

Based thereon, referring to fig. 1-3, an embodiment of the present application provides an engine case 10. Specifically, the engine case 10 of an embodiment includes a case 11 and a cantilever 12, where the case 11 includes a first wall 111 and a second wall 112 disposed opposite to each other, and the first wall 111 faces the case cover of the engine, and the second wall 112 faces the crankcase of the engine. One end of the cantilever 12 is connected with the box 11, the other end extends away from the box 11 and forms a connecting end 124 for connecting with a vehicle frame, the cantilever 12 comprises a first side surface 121, a connecting surface 122 and a top surface 123, the first side surface 121 faces to the same side as the first wall surface 111, the first side surface 121 is parallel to and spaced from the first wall surface 111, and specifically, the first side surface 121 is spaced from the first wall surface 111 in the normal direction of the first wall surface 111. The connection surface 122 connects the first side surface 121 and the first wall surface 111, and preferably, the connection surface 122 is disposed perpendicular to both the first side surface 121 and the first wall surface 111. A reinforcing rib 13 is arranged between the connecting surface 122 and the first wall surface 111, and the reinforcing rib 13 extends towards the box 11 along the connecting end 124; the rib 13 connects the first side 121 and the first wall 111 to reinforce the junction of the connecting surface 122 and the first wall 111. The top surface 123 connects the first side surface 121 and the connecting surface 122, and the connection between the top surface 123 and the connecting surface 122 is convexly provided with a convex rib 14, and the convex rib 14 extends from the first side surface 121 to the first wall surface 111, so as to reinforce the connection between the top surface 123 and the connecting surface 122.

The engine case 10 is provided with the reinforcing rib 13 between the connecting surface 122 of the cantilever 12 and the first wall surface 111 of the case 11, and the reinforcing rib 13 extends along the connecting end 124 of the cantilever 12 towards the direction of the case 11, and the first side surface 121 and the first wall surface 111 are connected by the reinforcing rib 13, so that the connecting part of the connecting surface 122 and the first wall surface 111 which are originally structurally weak is structurally reinforced, when the cantilever 12 bears acting force, the reinforcing rib 13 can effectively resist and disperse the acting force, so that the stress concentration of the connecting part of the connecting surface 122 and the first wall surface 111 is reduced, and further, the cracking or fracture phenomenon at the connecting part of the connecting surface 122 and the first wall surface 111 is reduced. In the same way, by arranging the convex rib 14 between the top surface 123 of the cantilever 12 and the connecting surface 122 and enabling the reinforcing rib 13 to extend from the first side surface 121 to the first wall surface 111, the joint of the top surface 123 and the first wall surface 111 which are originally structurally weak is structurally reinforced, when the cantilever 12 bears acting force, the acting force can be transmitted to the box 11 along the convex rib 14, so that stress concentration at the joint of the top surface 123 and the connecting surface 122 is reduced, and further cracking or fracture phenomenon at the joint of the connecting surface 122 and the first wall surface 111 is reduced. Through the cooperation of strengthening rib 13 and protruding muscle 14, realized carrying out dual reinforcement to the junction of cantilever 12 and box 11, reduced that cantilever 12 and box 11 appear cracking or fracture scheduling phenomenon, and then reduced engine case 10 and appear leaking the oily bad problem, guaranteed driver's safety.

Referring to fig. 6 and 7, optionally, in an embodiment, a thickened portion 15 is disposed at a position of the second wall 112 of the case 11 corresponding to the rib 14, and the thickened portion 15 protrudes from the second wall 112 in a direction away from the first wall 111. Specifically, the thickened portion 15 is arranged at the position, corresponding to the protruding rib 14, of the second wall surface 112 of the box 11, and the wall thickness of the position, corresponding to the protruding rib 14, of the box 11 is increased by the thickened portion 15, so that the connection position of the protruding rib 14 and the box 11 is structurally reinforced, stress concentration at the connection position of the protruding rib 14 and the box 11 is reduced, and the cracking problem at the connection position of the protruding rib 14 and the box 11 is further reduced. Simultaneously, the thickened part 15 is matched with the reinforcing ribs and the convex ribs 14, and triple reinforcement can be carried out on the joint of the cantilever 12 and the box body 11 from two sides of the cantilever 12, so that the structural strength of the engine case 10 is greatly enhanced.

Preferably, the height of the thickened portion 15 protruding from the second wall surface 112 is 2mm-6mm, specifically, the purpose of structural reinforcement of the connection part of the protruding rib 14 and the box 11 cannot be achieved if the height of the thickened portion 15 protruding from the second wall surface 112 is too small, and the thickened portion 15 is easy to interfere with other parts in the engine if the height of the thickened portion 15 protruding from the second wall surface 112 is too large, and the purpose of reinforcing the connection part of the protruding rib 14 and the box 11 is satisfied and interference between the thickened portion 15 and other parts in the engine is avoided by configuring the height of the thickened portion 15 protruding from the second wall surface 112 to be 2mm-6 mm.

With continued reference to fig. 6, the cantilever 12 further includes a second side 126 opposite the first side 121, and the second side 126 is provided with ribs 127, where the ribs 127 extend from the connection end 124 to the housing 11. Through protruding the rib 127 that is equipped with at the second side 126 to make rib 127 extend to box 11 direction along link 124, further strengthened the overall structure of cantilever 12, when link 124 of cantilever 12 receives the effort, the effort can be followed protruding muscle 14 and transmitted on the box 11, reduced stress concentration on cantilever 12, and then avoided cantilever 12 to appear splitting or fracture phenomenon. Preferably, the number of the ribs 14 may be plural, and the plural ribs 14 are arranged on the cantilever 12 at intervals, so as to enhance the reinforcing effect on the cantilever 12.

Referring to fig. 4 and 5, optionally, in an embodiment, the connection surface 122 is disposed perpendicular to the first wall surface 111, the reinforcing rib 13 includes an inclined surface 131 connecting the first wall surface 111 and the connection surface 122, and an included angle between the inclined surface 131 and the first wall surface 111 and an included angle between the inclined surface 131 and the connection surface 122 are disposed at an acute angle. In this way, a stable triangle structure can be formed between the inclined surface 131, the connecting surface 122 and the first wall surface 111, and the connection stability between the cantilever 12 and the box 11 is further improved. Preferably, the included angle between the inclined surface 131 and the first wall surface 111 ranges from 20 ° to 70 °, and the included angle between the inclined surface 131 and the connecting surface 122 ranges from 20 ° to 70 °, wherein the included angle between the inclined surface 131 and the first wall surface 111 and the included angle between the inclined surface 131 and the connecting surface 122 are complementary angles.

Alternatively, in one embodiment, the number of the reinforcing ribs 13 is plural, and the plural reinforcing ribs 13 are arranged at intervals along the connection surface 122. For example, in the present embodiment, two reinforcing ribs 13 are provided between the connection surface 122 and the first wall surface 111, and the two reinforcing ribs 13 are provided at intervals along the connection surface 122. It should be noted that, in other embodiments, the number of the reinforcing ribs 13 may be three, four or more, which is not limited herein. By disposing the plurality of reinforcing ribs 13 between the connection surface 122 and the first wall surface 111, the reinforcing effect on the connection portion of the connection surface 122 and the first wall surface 111 is improved.

Referring to fig. 3, alternatively, in one embodiment, the side of bead 14 facing away from top surface 123 is formed with a curved surface 141. By forming the cambered surface 141 on one side of the convex rib 14 away from the top surface 123, the sharp angle at the joint of the top surface 123 and the connecting surface 122 is avoided, so that the possibility of stress concentration at the joint of the top surface 123 and the connecting surface 122 is reduced, and the structural strength of the joint of the top surface 123 and the connecting surface 122 is further improved.

Referring to fig. 3, optionally, in an embodiment, the first wall 111 is provided with a cover surface 113 for connecting to the case cover, and the cover surface 113 has a first interval from the rib 13; the joint surface 113 and the rib 14 have a second interval. Specifically, in order to ensure the connection sealing effect between the case 11 and the case cover, it is generally necessary to finish the joint cover 113, and by providing a first space between the joint cover 113 and the reinforcing rib 13 and a second space between the joint cover 113 and the rib 14, damage to the reinforcing rib 13 and the rib 14 during processing the joint cover 113 is avoided. Preferably, the first interval is 1 mm-3 mm; the second interval is 1 mm-3 mm.

Referring to fig. 1 and 2, optionally, in an embodiment, the connection end 124 of the suspension arm 12 is provided with a connection hole 125 penetrating the first side 121 and the second side 126, the connection hole 125 being for interfacing with the vehicle frame. Specifically, the frame includes a frame body and a swing arm, and a bolt is disposed on the swing arm and is inserted into the connection hole 125, so as to connect the cantilever 12 with the swing arm.

With continued reference to fig. 1, an embodiment of the present application further provides a motorcycle, specifically, a motorcycle of an embodiment includes a frame and an engine case 10 of any of the above embodiments, the frame includes a frame body and a rocker arm connected to the frame body, and an end of the rocker arm away from the frame body is connected to a connection end 124 of the cantilever 12. Preferably, a bolt is arranged on the rocker arm, a connecting hole 125 is formed in a connecting end 124 of the rocker arm, and the bolt penetrates through the connecting hole 125, so that the cantilever 12 is connected with the rocker arm.

In the engine case 10 of the motorcycle, the reinforcing rib 13 is disposed between the connection surface 122 of the cantilever 12 and the first wall surface 111, and the reinforcing rib 13 extends along the connection end 124 of the cantilever 12 toward the direction of the case 11, and the first side surface 121 and the first wall surface 111 are connected by the reinforcing rib 13, so that the connection part of the connection surface 122 and the first wall surface 111, which are originally structurally weak, is structurally reinforced, when the cantilever 12 bears acting force, the reinforcing rib 13 can effectively resist and disperse the acting force, so that stress concentration at the connection part of the connection surface 122 and the first wall surface 111 is reduced, and further, cracking or fracture phenomenon at the connection part of the connection surface 122 and the first wall surface 111 is reduced. In the same way, by arranging the convex rib 14 between the top surface 123 of the cantilever 12 and the connecting surface 122 and enabling the reinforcing rib 13 to extend from the first side surface 121 to the first wall surface 111, the joint of the top surface 123 and the first wall surface 111 which are originally structurally weak is structurally reinforced, when the cantilever 12 bears acting force, the acting force can be transmitted to the box 11 along the convex rib 14, so that stress concentration at the joint of the top surface 123 and the connecting surface 122 is reduced, and further cracking or fracture phenomenon at the joint of the connecting surface 122 and the first wall surface 111 is reduced. Through the cooperation of strengthening rib 13 and protruding muscle 14, realized carrying out dual reinforcement to the junction of cantilever 12 and box 11, reduced that cantilever 12 and box 11 appear cracking or fracture scheduling phenomenon, and then reduced engine case 10 and appear leaking the oily bad problem, guaranteed driver's safety.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. An engine case, comprising:

the box body comprises a first wall surface and a second wall surface which are arranged in opposite directions; the method comprises the steps of,

the cantilever, one end of the cantilever is connected with the box body, the other end extends towards the direction away from the box body and forms a connecting end for connecting a frame, the cantilever comprises a first side face, a connecting face and a top face, the first side face faces to the same side with the first wall face, the first side face is parallel to the first wall face and is arranged at intervals, the connecting face is connected with the first side face and the first wall face, a reinforcing rib is arranged between the connecting face and the first wall face, and the reinforcing rib extends along the direction from the connecting end to the box body; the top surface is connected with the first side surface and the connecting surface, a convex rib is convexly arranged at the joint of the top surface and the connecting surface, and the convex rib extends from the first side surface to the first wall surface.

2. The engine case according to claim 1, wherein a thickened portion is provided at a position of the second wall surface corresponding to the bead, and the thickened portion protrudes from the second wall surface in a direction away from the first wall surface.

3. The engine case of claim 2, wherein the height of the thickened portion protruding from the second wall surface is 2cm to 6cm.

4. The engine compartment of claim 1, wherein the cantilever further comprises a second side disposed opposite the first side, the second side being provided with ribs protruding therefrom, the ribs extending in a direction from the connection end to the compartment.

5. The engine case of claim 1, wherein the connection surface is perpendicular to the first wall surface, and the reinforcing rib includes an inclined surface connecting the connection surface and the first wall surface, and an included angle between the inclined surface and the first wall surface and an included angle between the inclined surface and the connection surface are both acute.

6. The engine case of claim 5, wherein an included angle between the inclined surface and the first wall surface is 20 ° to 70 °; and/or the included angle between the inclined surface and the connecting surface is 20-70 degrees.

7. The engine compartment of claim 1, wherein the number of ribs is a plurality of the ribs spaced along the connection face.

8. The engine case of claim 1, wherein a cambered surface is formed on a side of the bead facing away from the top surface.

9. The engine case of claim 1, wherein the first wall surface is provided with a cover surface for connecting with a case cover, and the cover surface and the reinforcing rib have a first interval; the joint surface and the convex ribs are provided with a second interval; and/or, the cantilever further comprises a second side surface which is arranged opposite to the first side surface, the connecting end is provided with a connecting hole penetrating through the first side surface and the second side surface, and the connecting hole is used for being in butt joint with the frame.

10. A motorcycle comprising a frame and the engine case of any one of claims 1 to 9, the frame comprising a frame body and a swing arm connected to the frame body, one end of the swing arm remote from the frame body being connected to a connection end of the cantilever.