Crankcase cover and engine

Abstract

The utility model relates to the technical field of engines, and discloses a crankcase cover which comprises a cover body, a crankshaft hole is formed in the cover body, an installation boss used for being fixedly connected with a silencer is arranged at the top of the cover body, a bolt connecting hole is formed in the installation boss, and a connecting groove matched with the upper portion of a fan cover in a clamped mode is formed in the upper portion of the outer side face of the cover body. A positioning groove matched with the lower portion of the fan cover in a clamped mode is formed in the cover body, the engine comprises a crankcase, a magnetor, a fan and the fan cover, the crankcase cover is installed on the right side of a crankcase body, the fan cover is installed on the right side of the crankcase, and the magnetor and the fan cover are arranged in an inner cavity of the fan cover; according to the utility model, the deformation of the fan cover with a cylindrical thin-wall structure when the fan cover is mounted on the crankcase cover can be effectively avoided, the cooling effect of the fan on the crankcase is ensured, the structural strength of the crankcase cover is enhanced, and the squeal abnormal sound of a magneto is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a crankcase cover and an engine. Background Art

[0002] In a forced-air-cooled pedal motorcycle engine, a cooling fan is arranged on the right side of the crankcase. To ensure its cooling effect, a fan cover capable of guiding air is installed on the crankcase (crankcase cover). However, since the material of the fan cover is usually PP material and the fan cover is a cylindrical thin-wall structure, it is easy for the fan cover to deform when installed on the crankcase, affecting its cooling effect. At the same time, since a magneto needs to be installed on the outer side surface of the crankcase cover and the weight of the magneto is relatively large, the magneto is likely to cause deformation of the crankcase cover. When the crankshaft rotates at a high speed, due to the influence of the crankshaft deflection and the deformation of the crankcase cover, the magneto rotor is prone to generate high-frequency whistling sounds. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a crankcase cover and an engine, which can effectively avoid the deformation of the fan cover with a cylindrical thin-wall structure when installed on the crankcase cover, ensure the cooling effect of the fan on the crankcase, enhance the structural strength of the crankcase cover, and reduce the abnormal whistling sound of the magneto.

[0004] To achieve the above purpose, one aspect of the utility model provides a crankcase cover, including a cover body. A crankshaft hole is provided on the cover body. It is characterized in that an installation boss for connecting and fixing with a muffler is provided on the top of the cover body. Bolt connection holes are provided on the installation boss. An upper part of the outer side surface of the cover body is provided with a connection groove for clamping and cooperating with an upper part of the fan cover. A plurality of fixing holes for fixing the cover body on the box body of the crankcase are provided on the outer periphery of the cover body. A plurality of first reinforcing ribs divergently distributed on the outer periphery of the crankshaft hole are provided on the outer side surface of the cover body. A positioning groove for clamping and cooperating with a lower part of the fan cover is provided on the first reinforcing rib extending from the crankshaft hole to the bottom fixing hole in the cover body. A first reinforcing ring rib coaxially arranged with the crankshaft hole is provided on the outer side surface of the cover body. The first reinforcing ring rib is connected to all the first reinforcing ribs respectively.

[0005] As a preferred scheme of the utility model, a rubber sleeve installation groove for clamping a magneto wire harness rubber sleeve is provided on the vertical wall. A vertical wall protruding outwards is provided on the outer side surface of the cover body. The connection groove is provided on the top of the vertical wall. A second reinforcing rib is provided between the installation boss and the vertical wall. The second reinforcing rib extends towards one side of the rubber sleeve installation groove. A first installation hole position for fastening the fan cover is provided on the second reinforcing rib. The first installation hole position is arranged at one end of the second reinforcing rib close to the vertical wall. A second installation hole position for fastening the fan cover is provided at the lower part of the cover body.

[0006] As a preferred solution of the present utility model, reinforcing arc ribs are provided on the outer side surface of the cover body, and the reinforcing arc ribs form the side wall of the positioning groove on the side close to the crankshaft hole.

[0007] As a preferred solution of the present utility model, the shape of the reinforcing arc ribs matches that of the lower inner cavity wall of the fan cover.

[0008] As a preferred solution of the present utility model, trigger mounting holes are provided on the inner side surface of the cover body. A third reinforcing rib extending from the crankshaft hole to the trigger mounting hole, a fourth reinforcing rib extending from the crankshaft hole to the idler wheel mounting hole, and a plurality of fifth reinforcing ribs divergently distributed on the outer periphery of the crankshaft hole are provided on the inner side surface of the cover body. One end of the fifth reinforcing rib is connected to the crankshaft hole, and the other end of the fifth reinforcing rib is connected to one of the fixing holes.

[0009] As a preferred solution of the present utility model, a second reinforcing ring rib coaxial with the crankshaft hole is provided on the inner side surface of the cover body, and the second reinforcing ring rib penetrates through the middle parts of the third reinforcing rib, the fourth reinforcing rib, and all the fifth reinforcing ribs.

[0010] As a preferred solution of the present utility model, a sixth reinforcing rib is provided on the inner side surface of the cover body, and the sixth reinforcing rib is connected between the two fixing holes on the left and right sides of the lower part of the cover body.

[0011] As a preferred solution of the present utility model, a reinforcing rib is connected between the idler wheel mounting hole and the mounting boss on the inner side surface of the cover body.

[0012] In addition, another aspect of the present utility model further provides an engine, including a crankcase, a magneto, a fan, and a fan cover. The crankcase includes a box body and the crankcase cover as described above. The crankcase cover is installed on the right side of the box body. The magneto is installed on the crankcase cover. The fan is arranged on the magneto. The fan cover is installed on the right side of the crankcase and houses the magneto and the fan in the inner cavity of the fan cover.

[0013] Compared with the prior art, the crankcase cover and the engine of the embodiment of the present utility model have the beneficial effects that:

[0014] The utility model designs a connecting groove that mates with the upper part of the fan cover and a positioning groove that mates with the lower part of the fan cover. The fan cover is clamped on the connecting groove and the positioning groove. The connecting groove can prevent the upper part of the fan cover from deforming inwards, and the positioning groove can prevent the lower part of the fan cover from deforming inwards and outwards, effectively avoiding the deformation of the fan cover with a cylindrical thin-walled structure when it is installed on the crankcase cover, ensuring the cooling effect of the fan on the crankcase; moreover, the organic combination of the first reinforcing rib and the first reinforcing ring rib can enhance the structural strength of the crankcase cover, avoid the deformation of the crankcase cover caused by the excessive weight of the magneto, improve the support for the crankshaft at the same time, reduce the deflection deformation, and reduce the abnormal noise of the magneto. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below.

[0016] Figure 1 It is a schematic diagram of the outer side structure of a crankcase cover provided by the present utility model;

[0017] Figure 2 It is a schematic diagram of the inner side structure of a crankcase cover provided by the present utility model;

[0018] Figure 3 It is a schematic diagram of the connection structure between the crankcase and the magneto provided by the present utility model;

[0019] Figure 4 For Figure 3 the sectional view taken along the line A-A in

[0020] Figure 5 It is a schematic diagram of the structure of an engine provided by the present utility model;

[0021] Figure 6 For Figure 5 the sectional view taken along the line B-B in

[0022] Figure 7 It is a schematic diagram of the connection structure between the crankcase and the rear wheel fender provided by the present utility model;

[0023] Figure 8 It is a schematic diagram of the connection structure between the crankcase, the muffler and the rear wheel fender provided by the present utility model;

[0024] In the figure, there are cover body 1; crankshaft hole 2; mounting boss 3; bolt connection hole 4; vertical wall 5; connection groove 6; positioning groove 7; rubber sleeve mounting groove 8; second reinforcing rib 9; first mounting hole position 10; second mounting hole position 11; fixing hole 12; first reinforcing rib 13; first reinforcing rib 14 of the fixing hole extending from the crankshaft hole to the bottom of the cover body; reinforcing arc rib 15; first reinforcing ring rib 16; trigger mounting hole 17; third reinforcing rib 18; idler wheel mounting hole 19; fourth reinforcing rib 20; fifth reinforcing rib 21; second reinforcing ring rib 22; sixth reinforcing rib 23; box body 24; seventh reinforcing rib 25; eighth reinforcing rib 26; rear wheel mudguard 27; connection ear 28; ninth reinforcing rib 29; tenth reinforcing rib 30; eleventh reinforcing rib 31; connection reinforcing rib 32; reinforcing rib 33; muffler 34; magneto 35; fan 36; fan cover 37; mounting hole position 38; starting idler wheel 39. Detailed implementation manners

[0025] The following combines the accompanying drawings and embodiments to further describe in detail the specific implementation manners of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0027] As Figures 1 to 6As shown in the figure, a crankcase cover of a preferred embodiment of the present utility model includes a cover body 1. A crankshaft hole 2 is provided on the cover body 1. An installation boss 3 for connecting and fixing with a muffler 34 extends upward from the top of the cover body 1. A bolt connection hole 4 is provided on the installation boss 3. An upright wall 5 protruding outward is provided on the upper part of the outer side surface of the cover body 1. A connection groove 6 for snap-fitting with the upper part of a fan cover 37 is provided at the top of the upright wall 5. A plurality of fixing holes 12 for fixing the cover body 1 on a crankcase body 24 are provided on the outer periphery of the cover body 1. A plurality of first reinforcing ribs 13 distributed in a divergent shape are provided on the outer side surface of the cover body 1 around the crankshaft hole 2. A positioning groove 7 for snap-fitting with the lower part of the fan cover 37 is provided on a first reinforcing rib 14 extending from the crankshaft hole 2 to the fixing hole 12 at the bottom in the cover body 1. The first reinforcing ribs 13 can strengthen the structural strength of the cover body 1. Since the first reinforcing ribs 13 are convex structures themselves, it is convenient to arrange the positioning groove 7 on the first reinforcing rib 14 extending from the crankshaft hole to the fixing hole at the bottom of the cover body, optimizing the layout of the structures on the cover body 1. A plurality of first reinforcing ribs 14 distributed in a divergent shape are provided on the outer side surface of the cover body 1 around the crankshaft hole 2. One end of the first reinforcing rib 14 is connected to the crankshaft hole 2, and the other end of the first reinforcing rib 14 is connected to one of the fixing holes 12. A first reinforcing ring rib 16 arranged coaxially with the crankshaft hole 2 is provided on the outer side surface of the cover body 1. The first reinforcing ring rib 16 is respectively connected to the middle parts of the first reinforcing ribs 14.

[0028] It can be seen that by designing the connection groove 6 for cooperating with the upper part of the fan cover 37 and the positioning groove 7 for cooperating with the lower part of the fan cover 37, the fan cover 37 is snap-fitted on the connection groove 6 and the positioning groove 7. The connection groove 6 can prevent the upper part of the fan cover 37 from deforming inward, and the positioning groove 7 can prevent the lower part of the fan cover 37 from deforming inward and outward, effectively avoiding the deformation of the fan cover 37 with a cylindrical thin-wall structure when it is installed on the crankcase cover, ensuring the cooling effect of the fan 36 on the crankcase. Moreover, the organic combination of the first reinforcing ribs 14 and the first reinforcing ring rib 16 can enhance the structural strength of the crankcase cover, avoid the deformation of the crankcase cover caused by the excessive weight of the magneto 35, improve the support for the crankshaft at the same time, reduce the deflection deformation, and reduce the whistling abnormal sound of the magneto 35.

[0029] Further, a rubber sleeve installation groove 8 for clamping the wiring harness rubber sleeve of the magneto 35 is formed in the vertical wall 5. A second reinforcing rib 9 is provided between the mounting boss 3 and the vertical wall 5. The second reinforcing rib 9 extends towards the side of the rubber sleeve installation groove 8. A first mounting hole position 10 for fastening the fan cover 37 is provided on the second reinforcing rib 9. The first mounting hole position 10 is arranged at one end of the second reinforcing rib 9 close to the vertical wall 5. A second mounting hole position 11 for fastening the fan cover 37 is provided at the lower part of the cover body 1. The second reinforcing rib 9 can enhance the structural strength between the mounting boss 3 and the vertical wall 5. At the same time, the first mounting hole position 10 is arranged close to the rubber sleeve installation groove 8, so that the bolt fastening point of the fan cover 37 is as close as possible to the rubber sleeve installation groove 8, which can increase the pressing force of the fan cover 37 on the wiring harness rubber sleeve of the magneto 35, ensure good fastening effect of the wiring harness rubber sleeve of the magneto 35, and prevent the wiring harness rubber sleeve of the magneto 35 from bulging or being displaced during actual use.

[0030] Exemplarily, a reinforcing connecting rib 32 is connected between the second reinforcing rib 9 and the vertical wall 5. The reinforcing connecting rib 32 is perpendicular to the second reinforcing rib 9, which can improve the structural rigidity between the second reinforcing rib 9 and the vertical wall 5.

[0031] Further, a reinforcing arc rib 15 is provided on the outer side surface of the cover body 1. The reinforcing arc rib 15 forms the side wall of the positioning groove 7 close to the crankshaft hole 2. Further, the shape of the reinforcing arc rib 15 matches the shape of the lower inner cavity wall of the fan cover 37. The reinforcing arc rib 15 can effectively support the lower inner cavity wall of the reinforcing arc rib 15 and the fan cover 37, and effectively prevent the fan cover 37 from deforming and affecting the cooling effect of the fan 36.

[0032] To further strengthen the structural strength of the crankcase cover, a trigger mounting hole 17 is provided on the inner side surface of the cover body 1. A third reinforcing rib 18 extending from the crankshaft hole 2 to the trigger mounting hole 17 is provided on the inner side surface of the cover body 1. A fourth reinforcing rib 20 extending from the crankshaft hole 2 to the idler wheel mounting hole 19 is provided on the inner and outer side surfaces of the cover body 1. A plurality of fifth reinforcing ribs 21 distributed in a divergent shape are provided on the inner side surface of the cover body 1 around the periphery of the crankshaft hole 2. One end of the fifth reinforcing rib 21 is connected to the crankshaft hole 2, and the other end of the fifth reinforcing rib 21 is connected to one of the fixing holes 12. Specifically, a second reinforcing ring rib 22 coaxial with the crankshaft hole 2 is provided on the inner side surface of the cover body 1. The second reinforcing ring rib 22 penetrates through the middle parts of the third reinforcing rib 18, the fourth reinforcing rib 20 and all the fifth reinforcing ribs 21. Reinforcing structures are provided on both the inner and outer side surfaces of the crankcase cover, so as to reduce the deformation of the crankcase cover caused by the magneto 35 with too large weight as much as possible, and ensure the normal operation of the magneto 35.

[0033] To enhance the structural strength of the lower part of the cover body 1, a sixth reinforcing rib 23 is provided on the inner side surface of the cover body 1, and the sixth reinforcing rib 23 is connected between two fixing holes 12 on the left and right sides of the lower part of the cover body 1.

[0034] A reinforcing rib 33 is provided between the idler wheel mounting hole 19 and the mounting boss 3 on the inner side surface of the cover body 1 to enhance the structural strength of the mounting boss 3.

[0035] As Figures 1 to 8 shown, a seventh reinforcing rib 25 and an eighth reinforcing rib 26 are further provided between the mounting boss 3 and the vertical wall 5. The seventh reinforcing rib 25, the eighth reinforcing rib 26 and the second reinforcing rib 9 are distributed in a divergent manner on the outer periphery of the mounting boss 3. The eighth reinforcing rib 26 is clamped between the seventh reinforcing rib 25 and the second reinforcing rib 9. The seventh reinforcing rib 25 is located on the side close to the rear fender 27. A connecting ear 28 for connecting and fastening the rear fender 27 is provided on the upper end surface of the seventh reinforcing rib 25 extending towards the side of the rear fender 27; arranging the seventh reinforcing rib 25, the eighth reinforcing rib 26 and the second reinforcing rib 9 in a divergent manner between the mounting boss 3 and the vertical wall 5 can effectively improve the structural strength of the mounting boss 3 in the cover body 1, greatly reduce the deformation of the crankcase cover caused by the suspension of the muffler 34 on the crankcase cover, and further improve the sealing performance of the crankcase cover on the crankcase body 24 to prevent the leakage of crankcase oil; at the same time, a connecting ear 28 for connecting and fastening the rear fender 27 is provided by extending the seventh reinforcing rib 25, so that the manufacturing process of the connecting ear 28 is simpler, and the layout of the crankcase cover is more compact, which is beneficial to the miniaturization and lightweight of the crankcase. Moreover, the connecting ear 28 is provided on the seventh reinforcing rib 25, effectively improving the structural strength between the connecting ear 28 and the main body of the crankcase cover.

[0036] To further improve the supporting effect of the mounting boss 3 on the muffler 34, the extension line of the eighth reinforcing rib 26 passes through the center point of the bolt connection hole 4, and the eighth reinforcing rib 26 is perpendicular to the vertical wall 5, which can effectively increase the tensile strength of the mounting boss 3.

[0037] A ninth reinforcing rib 29 extending from the trigger mounting hole 17 to the vertical wall 5 is provided on the outer side surface of the cover body 1. The ninth reinforcing rib 29 is perpendicular to the vertical wall 5, which can enhance the structural strength of the trigger mounting hole 17.

[0038] A tenth reinforcing rib 30 is provided between the fixing hole 12 on the upper right side of the outer side surface of the cover body 1 and the vertical wall 5. Further, the tenth reinforcing rib 30 is perpendicular to the vertical wall 5, which improves the strength of the fixing hole 12 at the edge of the cover body 1. At the same time, the eighth reinforcing rib 26, the ninth reinforcing rib 29 and the tenth reinforcing rib 30 are all connected to the vertical wall 5 and are all perpendicular to the vertical wall 5, which plays a supporting role for the vertical wall 5 and effectively strengthens the structural strength of the vertical wall 5.

[0039] An eleventh reinforcing rib 31 is provided on the inner side surface of the cover body 1 and is connected between the bolt connection hole 4 and the fixing hole 12 on the right side of the mounting boss 3 and close to the vertical wall 5. The eleventh reinforcing rib 31 can strengthen the structural strength of the top of the cover body 1, and at the same time increase the structural strength of the mounting boss 3, avoiding deformation of the mounting boss 3 caused by the installation and connection of the muffler 34.

[0040] In addition, the present utility model also provides an engine, including a crankcase, a magneto 35, a fan 36 and a fan cover 37. The crankcase includes a box body 24 and the above-mentioned crankcase cover. The crankcase cover is installed on the right side of the box body 24. The magneto 35 is installed on the crankcase cover. The fan 36 is arranged on the magneto 35. The fan cover 37 is installed on the right side of the crankcase and houses the magneto 35 and the fan 36 in the inner cavity of the fan cover 37. At least one mounting hole position 38 for fastening the fan cover 37 is provided on the box body 24 to ensure good fastening effect of the fan cover 37 on the crankcase. The engine is preferably a forced-air-cooled pedal-type motorcycle engine. The engine is provided with the above-mentioned crankcase cover, and thus has all the beneficial effects of the above-mentioned crankcase cover, which will not be described one by one here.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A crankcase cover, comprising a cover body, wherein the cover body is provided with a crankshaft hole, characterized in that: The top of the cover body is provided with a mounting boss for connecting and fixing to the muffler, and the mounting boss is provided with a bolt connection hole, the upper part of the outer side surface of the cover body is provided with a connecting groove that is snap-fitted with the upper part of the fan cover, the outer periphery of the cover body is provided with a plurality of fixing holes for fixing the cover body to the case body of the crankcase, the outer side surface of the cover body is provided with a plurality of first reinforcing ribs distributed in a divergent manner on the outer periphery of the crankshaft hole, the first reinforcing rib extending from the crankshaft hole to the fixing hole at the bottom of the cover body is provided with a positioning groove that is snap-fitted with the lower part of the fan cover, the outer side surface of the cover body is provided with a first reinforcing ring rib coaxially arranged with the crankshaft hole, and the first reinforcing ring rib is respectively connected to all the first reinforcing ribs.

2. The crankcase cover according to claim 1, characterized in that: The outer side surface of the cover body is provided with a vertical wall protruding outward, and a rubber sleeve mounting groove for clamping the magnetic motor wiring harness rubber sleeve is opened on the vertical wall, and the connecting groove is arranged at the top of the vertical wall. A second reinforcing rib is provided between the mounting boss and the vertical wall, and the second reinforcing rib extends toward one side of the rubber sleeve mounting groove. A first mounting hole position for fastening the fan cover is provided on the second reinforcing rib, and the first mounting hole position is arranged at one end of the second reinforcing rib close to the vertical wall. The lower part of the cover body is provided with a second mounting hole position for fastening the fan cover.

3. The crankcase cover according to claim 2, characterized in that: A reinforcing connecting rib is connected between the second reinforcing rib and the vertical wall, and the reinforcing connecting rib is perpendicular to the second reinforcing rib.

4. The crankcase cover according to claim 1, characterized in that: A reinforcing arc rib is provided on the outer side surface of the cover body, and the reinforcing arc rib forms a side wall of the positioning groove on a side close to the crankshaft hole.

5. The crankcase cover according to claim 4, characterized in that: The reinforcing arc ribs match the shape of the lower inner cavity wall of the fan cover.

6. The crankcase cover according to claim 1, characterized in that: The inner side surface of the cover body is provided with a trigger mounting hole, the inner side surface of the cover body is provided with a third reinforcing rib extending from the crankshaft hole to the trigger mounting hole, the inner side surface of the cover body is provided with a fourth reinforcing rib extending from the crankshaft hole to the idler mounting hole, and the inner side surface of the cover body is provided with a plurality of fifth reinforcing ribs distributed in a divergent manner around the crankshaft hole, one end of the fifth reinforcing rib is connected to the crankshaft hole, and the other end of the fifth reinforcing rib is connected to one of the fixing holes.

7. The crankcase cover according to claim 6, characterized in that A second reinforcing ring rib coaxially arranged with the crankshaft hole is provided on the inner side surface of the cover body, and the second reinforcing ring rib passes through the middle portion of the third reinforcing rib, the middle portion of the fourth reinforcing rib and the middle portions of all the fifth reinforcing ribs.

8. The crankcase cover according to claim 1, characterized in that: A sixth reinforcing rib is disposed on the inner side surface of the cover body, and the sixth reinforcing rib is connected between the two fixing holes on the left and right sides of the lower portion of the cover body.

9. The crankcase cover according to claim 1, characterized in that: An idler wheel mounting hole is provided on the inner side surface of the cover body, and a reinforcing rib is connected between the mounting boss.

10. An engine, characterized in that: The invention comprises a crankcase, a magnetic motor, a fan and a fan cover, wherein the crankcase comprises a case body and a crankcase cover as claimed in any one of claims 1 to 9, the crankcase cover is mounted on the right side of the case body, the magnetic motor is mounted on the crankcase cover, the fan is arranged on the magnetic motor, the fan cover is mounted on the right side of the crankcase and the magnetic motor and the fan cover are arranged in the inner cavity of the fan cover.

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