JP6296438B2 - Dust cover, engine unit - Google Patents

Description

  The present invention relates to a dustproof cover and an engine unit including the dustproof cover.

Agricultural working machines are often equipped with so-called general-purpose engines. This general-purpose engine is generally a vertical engine having a ground and a horizontal output shaft. However, in a working machine such as a tea mower or a cultivator, it is preferable to use a horizontal engine having a vertical output shaft perpendicular to the ground because of the direction of the drive shaft.
Patent Document 1 describes a horizontal engine having a vertical output shaft. In the case of a horizontal engine having a vertical output shaft in this way, a recoil starter is disposed above the engine. Moreover, the said engine has arrange | positioned the cooling fan above an engine, and is suppressing the exhaust_gas | exhaustion direction of cooling air from facing down, and suppresses that a dust penetrate | invades from an exhaust port.

Japanese Utility Model Publication No. 6-058122

  However, the engine described in Patent Document 1 described above requires a design change for arranging the recoil starter and the cooling fan on the upper side of the engine. On the other hand, in the case of a general-purpose engine with a recoil starter on one side of the engine and a cooling fan on the other side in the output shaft direction, discharge the cooling air sent from the cooling fan to the cylinder block from the recoil starter side. It becomes. In other words, if a general-purpose engine designed for vertical installation is placed horizontally, the cooling air outlet will face upward, making it easier for dust such as leaves and soil to enter from the outlet, and these dust will enter the cylinder block. There is a possibility that clogging between fins may cause cooling failure. Although it is conceivable to attach a dustproof cover so as to cover the discharge port, there are problems such as an increase in fixing parts and an increase in man-hours due to fixing work.

  The present invention has been made in view of the above circumstances, and can be easily mounted / removed while suppressing an increase in the number of parts, and prevents dust from entering the cooling system without changing the design of the engine. It is an object of the present invention to provide a dustproof cover and an engine unit that can prevent cooling failure.

In order to solve the above problems, the following configuration is adopted.
The dust-proof cover according to the present invention is an engine in which at least one of a cooling air discharge unit that discharges cooling air, a cooling air intake unit that intakes cooling air, and a recoil starter that is a starting device are arranged on the upper side. A dust cover for the unit, comprising a cover body having a plurality of holes for restricting the passage of dust while allowing the passage of air, the cover body having an opening through which the recoil starter is inserted, A first fixing portion fixed to the recoil starter by inserting the recoil starter through the opening, and the first fixing portion wraps around the side of the engine unit and the lower side of the engine unit. The engine unit is sandwiched from above and below to fix the engine unit to a second fixing portion, the cooling air discharge unit, and the cooling air suction. A cover portion for covering the upper side at least one of the parts, wherein the engine unit, and the recoil starter across the engine body on the opposite side, Ru provided with a cooling fan for blowing cooling air.
The cover body can be fixed to the recoil starter by inserting the recoil starter through the first fixing portion. Further, the second fixing portion can be fixed to the engine by sandwiching the engine with the second fixing portion. As a result, for example, it can be easily mounted on a general-purpose engine. Moreover, since it fixes by the 1st fixing | fixed part and the 2nd fixing | fixed part, it can prevent falling off during the operation | work using an engine, and can improve reliability. Furthermore, since it is possible to prevent dust from entering from the cooling air discharge part and the cooling air intake part by the cover part, it is possible to prevent poor cooling.

Further, dust cover according to the invention, in the dust cover, the front Symbol cover portion, wherein the cooling air discharging portion discharging cover portion covering the upper, open upward said threaded cooling fan and communicating the A cooling air intake cover portion that covers a gap as the cooling air intake portion.
With this configuration, it is possible to prevent dust from entering from the cooling air discharge unit, and it is possible to prevent dust from entering from a gap communicating with the cooling fan and obstructing intake air by the cooling fan. As a result, the occurrence of poor cooling can be further suppressed.

Furthermore, the dust cover according to the present invention is the dust cover described above, wherein the engine unit is disposed on one side of the cylinder orthogonal to the crankshaft, and a fuel tank disposed on the opposite side of the cylinder with the crankshaft interposed therebetween. An exhaust device that is disposed, and a carburetor disposed on the other side of the cylinder opposite to the exhaust device, wherein the opening cover portion is a gap between the recoil starter and the fuel tank At least a first cover portion that covers a gap, a second cover portion that covers a gap between the fuel tank and the carburetor, and a third cover portion that covers a gap between the fuel tank and the exhaust device. One may be provided.
With this configuration, the fuel tank is disposed on the opposite side of the cylinder across the crankshaft, the exhaust device is disposed on one side of the cylinder orthogonal to the crankshaft, and the carburetor is disposed on the opposite side of the exhaust device. When installing on the other side of the cylinder, a gap between the recoil starter and the fuel tank, a gap between the fuel tank and the carburetor, and a gap between the fuel tank and the exhaust device are required. Accordingly, the first cover part, the second cover part, and the third cover part can be covered. As a result, it is possible to suppress the entry of dust that inhibits the intake of the cooling fan from the gaps that open upward.

Furthermore, in the dustproof cover according to the present invention, the first fixing portion in the dustproof cover may include a guide portion that extends outward in the axial direction of the crankshaft from the inner peripheral edge of the opening.
By comprising in this way, the direction of the edge of the cover main body in an opening part and the insertion direction of a recoil starter can be made to correspond. Therefore, it can prevent that the edge of a cover part main body is caught on the surface of a recoil starter, and a recoil starter is damaged. Further, the recoil starter can be smoothly inserted into the first fixing portion of the cover body.

An engine unit according to the present invention includes the dust cover.
With this configuration, it is possible to prevent dust from entering the cooling system when the crankshaft is oriented in the vertical direction without changing the design such as changing the arrangement of the cooling fans.

  According to the dustproof cover and the engine unit of the present invention, it is possible to easily attach and detach while suppressing an increase in the number of parts, and it is possible to prevent dust from entering the cooling system without changing the design of the engine unit. It is possible to prevent cooling failure.

It is a top view of the engine unit in one embodiment of this invention. It is a bottom view of the engine unit. It is a horizontal sectional view of the engine unit. It is a front view of the engine unit. It is a rear view of the engine unit. It is a vertical sectional view of the engine unit. It is a left view of the said engine unit. It is a top view of the dustproof cover in this embodiment. It is a front view of the dustproof cover. It is a rear view of the dustproof cover. It is a right view of the said dustproof cover.

  Hereinafter, an engine unit and a dustproof cover according to an embodiment of the present invention will be described with reference to the drawings. The engine unit in this embodiment is used as a drive source for a work machine such as a tea mower. This engine unit is a so-called two-cycle single-cylinder reciprocating engine, and a crankshaft is directed in the vertical direction. In the drawings used below, the arrow FR indicates the front of the engine unit, the arrow UP indicates the upper side of the engine unit, and the arrow RH indicates the right side of the engine unit. In the description of this embodiment, the intake side of the engine unit is described as the front and the exhaust side as the rear. However, the direction of use of the engine unit is not limited to these directions.

FIG. 1 is a plan view of an engine unit 1 according to an embodiment of the present invention. FIG. 2 is a bottom view of the engine unit 1. FIG. 3 is a horizontal sectional view of the engine unit 1 as viewed from above. FIG. 4 is a front view of the engine unit 1. FIG. 5 is a rear view of the engine unit 1. FIG. 6 is a vertical sectional view of the engine unit 1 as seen from the back side. FIG. 7 is a left side view of the engine unit 1.
As shown in FIGS. 1 to 6, the engine unit 1 includes an engine body 2, a carburetor 3 (vaporizer), an air cleaner 4, an exhaust device 5, a fuel tank 6, a clutch unit 39, and a recoil starter. 8, a resin cover 9, and a dust cover 10 are mainly provided.

  As shown in FIGS. 3 and 6, the engine body 2 includes a crankcase 11 and a cylinder 12. The crankcase 11 houses a crankshaft 13 whose axis O is directed in the vertical direction. The cylinder 12 is attached to the left side of the crankcase 11. The cylinder 12 accommodates a piston 14 therein. The piston 14 reciprocates in the left-right direction and is connected to the crankshaft 13 via the connecting rod 15. A spark plug 17 is detachably attached to the end 16 of the cylinder 12. The air-fuel mixture in the combustion chamber is ignited by the spark plug 17. A plurality of fins 18 for air cooling are formed on the outer surface of the cylinder 12.

  As shown in FIGS. 1 and 3, the carburetor 3 is disposed on the front side of the cylinder 12 via an insulator 3a and a carburetor gasket 3b. The carburetor 3 is fixed to the front side portion 19 of the cylinder 12. The carburetor 3 generates an air-fuel mixture in which fuel and air are mixed, and supplies the air-fuel mixture into the combustion chamber 21 via the reed valve 20 and the like. The carburetor 3 is further provided with a choke lever 22 on the air cleaner 4 side. Further, a pump operation unit P that sucks fuel from the fuel tank 6 into the carburetor 3 is attached to the right side surface of the carburetor 3.

  The air cleaner 4 is disposed on the front side of the carburetor 3 and is fixed to the front side portion 24 of the carburetor 3. Inside the air cleaner 4 is provided an intake filter 25 for removing dust and the like from the outside air. The air introduced through the intake filter 25 is supplied to the carburetor 3 for mixing with fuel.

  As shown in FIG. 3, the exhaust device 5 is disposed on the rear side of the cylinder 12. The exhaust device 5 has both functions of an expansion chamber and a silencer. The exhaust device 5 includes a concave inner case 27 and a concave outer case 28. The outer case 28 has a back surface 29 that is inclined so as to be separated from the cylinder 12 toward the right side. The exhaust device 5 includes an exhaust port portion 30 protruding rearward on the back surface 29 of the outer case 28. The exhaust port 30 is provided with an opening 31 facing upward so as to exhaust the exhaust gas upward. The opening 31 may face rearward or downward.

  The fuel tank 6 supplies fuel via the fuel tube 32 to the carburetor 3 described above. The fuel tank 6 is disposed on the right side of the crankcase 11. More specifically, the fuel tank 6 is formed so as to extend from the right side of the carburetor 3 to the right side of the exhaust device. Further, as shown in FIG. 3, the fuel tank 6 includes a recess 33 on the cross-sectional arc for securing a predetermined gap S <b> 1 between the fuel tank 6 and the crankcase 11. The fuel tank 6 includes a fuel supply unit 36 on the front side surface of which a cap 35 is detachably attached. The fuel supply unit 36 extends in the diagonally forward left direction. The fuel tube 32 extends to the inside of the fuel tank 6 through a seal member 37, and a strainer 38 is connected to the end thereof. The fuel tank 6 includes an overflow tube 32 a that returns surplus fuel returned from the carburetor 3 through the seal member 37 into the fuel tank 6.

  As shown in FIGS. 2, 4, and 6, a flywheel F is disposed in the space between the crankcase 11 and the fan case 7. The flywheel F includes a cooling fan 40. A clutch unit 39 is disposed near the end surface of the fan case 7. The clutch unit 39 constitutes a centrifugal clutch. The clutch unit 39 is disposed inside a clutch drum (not shown) provided at the upper end of a vertical output shaft (not shown). The clutch unit 39 is connected to the crankshaft 13 via the flywheel F provided with the cooling fan 40 and rotates together with the crankshaft 13. The clutch unit 39 includes a plurality of clutch shoes and a lining 42. The clutch shoe and lining 42 are displaced outward in the radial direction where the clutch drum is arranged as the centrifugal force increases, while being returned to the initial position by the elastic body 43 (see FIG. 2) when the centrifugal force decreases. It has become.

The flywheel F provided with the cooling fan 40 is connected to the crankshaft 13 of the engine body 2. The cooling fan 40 is a centrifugal fan, and discharges outside air sucked from the radially inner side to the radially outer side. The flywheel F is formed integrally with the clutch unit 39 described above, and is driven to rotate by the crankshaft 13.
The cooling air passage 41 is formed on the radially outer side of the cooling fan 40 by the crankcase 11 and the fan case 7. The cooling air passage 41 reaches a position below the cylinder 12 through the resin cover 9 and opens upward. That is, the cooling air sent from the cooling fan 40 through the cooling air passage 41 is blown to the fins 18 of the cylinder 12.

As shown in FIG. 6, the recoil starter 8 includes a spring S, a reel 44, a lever 45, a housing 46, and a rope 48.
A reel 48 around which a handle 47 (see FIGS. 4 and 5) is attached is wound around the reel 44. The reel 44 rotates by pulling a handle 47 attached to the rope 48. The reel 44 is connected to the upper end portion of the crankshaft 13 of the engine body 2 via a lever 45 and a pulley 49.
The lever 45 transmits the rotational power of the reel 44 to the crankshaft 13 only when the rope 48 wound around the reel 44 is pulled and the reel 44 rotates. The pulley 49 fixed to the crankshaft 13 includes a recoil pawl 50 that allows relative rotation of the reel 44 and the pulley 49 only in one direction.

  The housing 46 covers the reel 44 and the lever 45 from the outside. The housing 46 is formed so as to protrude above the cylinder 12. The housing 46 in this embodiment is formed in a columnar shape whose axis is directed in the vertical direction. Further, the housing 46 includes a tubular rope insertion port 51 (see FIG. 4) for pulling out the rope 48. Here, the recoil starter 8 is not limited to the one having the above-described internal structure, and recoil starters having various types of internal structures can be applied.

  As shown in FIG. 1, the housing 46 of the recoil starter 8 is fixed to the housing support 52. A flange portion 53 formed at the top and bottom of the fuel tank 6 is also fixed to the housing support portion 52. Further, a gap S <b> 2 leading to the cooling fan 40 is formed between the fuel tank 6 and the housing support portion 52.

As shown in FIGS. 1 to 3, 5, and 7, the resin cover 9 is a resin member that covers the engine body 2 and the like from the outside. The resin cover 9 includes an upper cover portion 54, an exhaust device cover portion 55, and a left cover portion 56.
As shown in FIG. 1, the upper cover portion 54 covers the entire cylinder 12 and a part of the carburetor 3 from above. The upper cover portion 54 includes a cooling air exhaust port 57 above the cylinder 12. The cooling air exhaust port 57 is a through hole for exhausting the cooling air that has cooled the cylinder 12 upward. The cooling air exhaust port 57 includes a plurality of partitioning portions 58 that partition the through holes. These partition portions 58 are elongated in the front-rear direction and are arranged side by side with a predetermined interval in the left-right direction.

  As shown in FIGS. 1 to 3, 5, and 7, the exhaust device cover portion 55 covers the upper surface side, the lower surface side, the rear surface side, and the left side surface side of the exhaust device 5 described above. The right edge 59 of the exhaust device cover portion 55 is disposed slightly closer to the fuel tank 6 than the center of the recoil starter 8 in the left-right direction (that is, the axis O). Further, the right edge 59 of the exhaust device cover portion 55 is disposed at a position where a predetermined gap S3 is formed between the right edge 59 and the left edge 60 of the fuel tank 6. The gap S3 communicates with the outside air intake 61 of the cooling fan 40.

  Each of the exhaust device cover portions 55 includes a heat radiation opening 62 for releasing the heat of the exhaust device 5 to the outside. The exhaust device cover portion 55 further includes an exhaust opening 63 for discharging the exhaust gas and radiating heat. The exhaust opening 63 is arranged on the right side of the heat dissipation opening 62. The heat radiating opening 62 and the exhaust opening 63 are formed over the upper surface side, the lower surface side, and the back surface side of the exhaust device cover portion 55, respectively. The heat radiation opening 62 and the exhaust opening 63 are formed in a lattice shape by front and rear partition portions 64 and left and right partition portions 65, respectively.

The left cover portion 56 covers the cylinder 12 and a part of the carburetor 3 from the left side. A through hole for inserting the ignition plug 17 (see FIG. 3) is formed in the left cover portion 56, and a plug cap 66 can be attached to and detached from the through hole.
Here, a gap S4 (see FIG. 1) larger than the gap S3 between the exhaust device cover 55 and the fuel tank 6 described above is formed between the carburetor 3 and the fuel tank 6 described above. The gap S4 also communicates with the outside air inlet 61 of the cooling fan 40.

FIG. 8 is a plan view of the dustproof cover 10. FIG. 9 is a front view of the dust cover 10. FIG. 10 is a rear view of the dust cover 10. FIG. 11 is a right side view of the dust cover 10.
The dustproof cover covers each cooling air exhaust port and the gaps leading to the cooling fan from above, allowing dust such as leaves, branches, and grass to enter the engine cooling system while allowing airflow in the vertical direction. Suppresses entering. For convenience of illustration, the dust cover 10 is not shown in FIGS. 2, 3, and 6.

  As shown in FIGS. 8 to 11, the dust cover 10 has a plurality of holes 67 that restrict the passage of dust while allowing the passage of air. The dust cover 10 in this embodiment is formed of a metal mesh. The hole 67 of the dust-proof cover 10 is formed sufficiently smaller than the one through hole partitioned by the cooling air exhaust port 57 described above.

The dust cover 10 includes a first fixing portion 68, a discharge portion cover portion 69, and a cooling air intake cover portion 70.
The first fixing portion 68 is an opening for fixing the dust cover 10 to the recoil starter 8. The first fixed portion 68 includes a plurality of guide portions 71 that are bent upward and rise on the inner periphery thereof. These guide portions 71 are formed by being divided into portions having a relatively large radius of curvature in plan view within the inner peripheral edge of the first fixed portion 68. Further, the first fixing portion 68 is formed with a V-shaped recess 72 that avoids the rope insertion port 51 of the recoil starter 8. Here, although the case where the guide part 71 is formed in the 1st fixing | fixed part 68 was demonstrated, the guide part 71 may be abbreviate | omitted. Moreover, the shape of the inner periphery of the 1st fixing | fixed part 68 in which the guide part 71 is formed is not restricted to the said shape. The inner peripheral edge of the first fixing portion 68 where the guide portion 71 is formed may be formed, for example, straight.

  The discharge part cover part 69 suppresses entry of dust into the cooling air exhaust port 57. The discharge portion cover portion 69 is disposed on the left side of the first fixing portion 68 and covers the cooling air exhaust port 57 from above.

The cooling air intake cover portion 70 opens upward and covers the gaps S <b> 2 to S <b> 4 that communicate with the outside air inlet 61 of the cooling fan 40. The cooling air intake cover part 70 includes a first cover part 73, a second cover part 74, and a third cover part 75.
The first cover portion 73 is disposed on the right side of the first fixing portion 68 and covers the gap S2 between the recoil starter 8 and the fuel tank 6 from above.

  The second cover portion 74 is disposed on the rear side of the first fixing portion 68 and covers the gap S <b> 3 between the resin cover 9 and the fuel tank 6. The second cover portion 74 is formed with a first notch portion 76 that avoids a region where exhaust gas is discharged.

  As shown in FIG. 7, the second cover portion 74 is formed to be bent along the exhaust device cover portion 55 of the resin cover 9. That is, the second cover portion 74 extends from the first fixing portion 68 to the exhaust device 5 side, and wraps around the back side of the engine unit 1 and extends downward. The second cover portion 74 extends to the position of the lower side surface 55a of the exhaust device cover portion 55 and is then bent forward.

  As shown in FIG. 1, the left side edge 77 of the second cover part 74 is disposed so as to cover the right side edge 78 of the resin cover 9 described above from the outside. The second cover portion 74 is fixed to the resin cover 9 by sandwiching the resin cover 9 from the upper and lower sides by the elasticity of the metal mesh. That is, the second cover portion 74 covering the gap S3 described above also serves as the second fixing portion of the present invention fixed to the resin cover 9.

  As shown in FIGS. 8 to 11, the third cover portion 75 is disposed on the front side of the first fixing portion 68 and covers the gap S <b> 4 between the fuel tank 6 and the carburetor 3. The third cover portion 75 is formed with a second notch portion 79 that avoids the engine stop operation portion 23. As shown in FIG. 1, the third cover portion 75 is bent downward slightly on the front side of the front end portion of the cooling fan 40 in the front-rear direction. The third cover portion 75 is formed with a width dimension equivalent to the gap S4 between the carburetor 3 and the fuel tank 6. The third cover part extends downward to the position of the cooling fan 40 in the vertical direction.

  As shown in FIG. 8, the dustproof cover 10 is formed with a hemming portion 81 where the metal mesh is folded back at an appropriate position of the edge portion 80. By these hemming portions 81, the edge portion 80 of the dustproof cover 10 can be formed in a round shape. Therefore, catching of the dustproof cover 10 can be suppressed and design properties can be improved.

  Therefore, according to the dustproof cover 10 of the above-described embodiment, the dustproof cover 10 can be fixed to the recoil starter 8 by inserting the first fixing portion 68 into the recoil starter 8. Furthermore, the second cover part 74 can be fixed to the engine unit 1 by sandwiching the engine unit 1 with the second cover part 74. As a result, the dust cover 10 can be easily attached to the engine unit 1. Moreover, since it fixes by the 1st fixing | fixed part 68 and the 2nd cover part 74, even if one fixation is cancelled | released, it suppresses that the dust-proof cover 10 falls off during the operation | work using the engine unit 1. Can improve reliability. Furthermore, since it is possible to suppress dust from entering from the cooling air exhaust port 57 by the discharge portion cover portion 69, it is possible to suppress the occurrence of poor cooling in the engine body 2.

  Further, since the dustproof cover 10 includes the cooling air intake cover portion 70, it is possible to suppress the dust from entering through the gap communicating with the cooling fan 40 and inhibiting the intake by the cooling fan 40. As a result, the occurrence of poor cooling in the engine body 2 can be further suppressed.

  Further, the fuel tank 6 is disposed on the opposite side of the cylinder 12 with the crankshaft 13 interposed therebetween, the exhaust device 5 is disposed on one side of the cylinder 12 orthogonal to the crankshaft 13, and the carburetor 3 is opposite to the exhaust device 5. When disposed on the other side of the cylinder 12 on the side, the clearance S2 between the recoil starter 8 and the fuel tank 6, the clearance S4 between the fuel tank 6 and the carburetor 3, and the fuel tank 6 and the exhaust device 5 Can be covered by the first cover portion 73, the second cover portion 74, and the third cover portion 75. As a result, it is possible to suppress the entry of dust that inhibits the intake of the cooling fan 40 from the gaps S2 to S4 that open upward.

  Further, by providing the first fixing portion 68 with the guide portion 71, the direction of the edge of the dustproof cover 10 in the first fixing portion 68 and the insertion direction of the recoil starter 8 can be matched. Therefore, it can suppress that the edge of the dust-proof cover 10 is caught on the surface of the recoil starter 8, and the recoil starter 8 is damaged. Further, the recoil starter 8 can be smoothly inserted into the first fixing portion 68 of the dust cover 10.

  Further, since the engine stop operation unit 23 is exposed upward by the second notch 79, the engine stop operation unit 23 can be operated without removing the dust cover 10. Further, since the choke lever 22 and the pump operation part P are not covered with the dust cover 10, the choke lever 22 and the pump operation part P can be operated without removing the dust cover 10. As a result, it can suppress that operativity falls.

  Further, in the engine unit 1 in which the recoil starter 8 and the cooling air exhaust port 57 are directed in the same direction, when the crankshaft 13 extends in the vertical direction without changing the design such as changing the arrangement of the cooling fan 40, the cooling system is entered. Intrusion of dust can be suppressed. As a result, the existing vertical engine unit 1 in which the crankshaft 13 extends in the horizontal direction can be used in a horizontal state in which the crankshaft 13 extends in the vertical direction.

  The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.

  For example, in the embodiment described above, a tea mower has been described as an example of a work machine to which the engine unit 1 is applied. However, other work machines may be used as long as they have an output shaft in a vertical direction. Moreover, although the case where the dustproof cover 10 mentioned above was formed with a metal mesh was demonstrated, it is not restricted to a mesh. For example, a punching metal having a plurality of through holes may be used. Furthermore, the material of the dust-proof cover 10 is not limited to metal as long as the material is rich in elasticity. For example, a resin dust cover 10 may be used.

  Furthermore, in the embodiment described above, the case where the dustproof cover 10 includes the discharge portion cover portion 69 and the cooling air intake cover portion 70 has been described. However, the dust cover 10 only needs to include at least one of the discharge part cover part 69 and the cooling air intake cover part 70. Furthermore, the case where the cooling air intake cover portion 70 includes the first cover portion 73, the second cover portion 74, and the third cover portion 75 has been described. However, the cooling air intake cover part 70 only needs to include at least one of the first cover part 73, the second cover part 74, and the third cover part 75.

  Further, in the engine unit 1 in the above-described embodiment, when both the cooling air exhaust port 57 that is the cooling air exhaust part and the gaps S2 to S4 that are the cooling air intake parts are arranged on the upper side of the engine unit 1. Explained. However, the engine unit 1 only needs to include at least one of the cooling air exhaust unit and the cooling air intake unit.

  In the above-described embodiment, the engine unit 1 including a two-stroke single cylinder engine has been described as an example. However, the present invention is not limited to this. Any engine unit 1 including an engine that performs cooling using a cooling fan may be used. For example, a four-stroke engine may be used.

1 Engine unit 2 Engine body 3 Carburetor 4 Air cleaner 5 Exhaust device 6 Fuel tank 7 Fan case 8 Recoil starter (starting device)
9 Resin cover 10 Dust-proof cover (cover body)
DESCRIPTION OF SYMBOLS 11 Crankcase 12 Cylinder 13 Crankshaft 14 Piston 15 Connecting rod 16 End part 17 Spark plug 18 Fin 19 Front side part 20 Reed valve 21 Combustion chamber 22 Choke lever 23 Engine stop operation part 24 Front side part 25 Intake filter 26 Right end part 27 Inner side Case 28 Outer case 29 Back 30 Exhaust port 31 Opening 32 Fuel tube 32a Overflow tube 33 Concave 34 Front side 35 Cap 36 Fuel supply unit 37 Seal member 38 Strainer 39 Clutch unit 40 Cooling fan 41 Cooling air passage 42 Clutch shoe and lining 43 Elastic body 44 Reel 45 Lever 46 Housing 47 Handle 48 Rope S Spring 49 Pulley 50 Recoil claw 51 Rope insertion port 52 C Managing the support portion 53 the flange portion 54 the upper cover section 55 the exhaust device cover portion 55a lower surface 56 left cover section 57 cooling air outlet (cooling air discharge portion)
58 partition 59 right edge 60 left edge 61 outside air inlet 62 heat release opening 63 exhaust opening 64 front and rear partition section 65 left and right partition section 66 plug cap 67 hole 68 first fixing section 69 discharge section cover section 70 cooling air intake Cover part 71 Guide part 72 Recessed part 73 First cover part 74 Second cover part (second fixing part)
75 Third cover portion 76 First notch portion 77 Left edge portion 78 Right edge portion 79 Second notch portion 80 Edge portion 81 Hemming portion F Flywheel P Pump operation portion S Spring S1 Clearance S2 Clearance S3 Clearance S4 Clearance

Claims (5)

A dust-proof cover for an engine unit in which at least one of a cooling air discharge unit that discharges cooling air and a cooling air intake unit that intakes cooling air and a recoil starter that is a starting device are arranged on the upper side,
A cover body having a plurality of holes for restricting the passage of dust while allowing the passage of air,
The cover body is
A first fixing portion that has an opening through which the recoil starter is inserted, and is fixed to the recoil starter by inserting the recoil starter into the opening;
From the first fixing portion, a second fixing portion that is fixed to the engine unit by wrapping around the engine unit from above and below by wrapping around the side of the engine unit and the lower side of the engine unit;
A cover portion covering at least one of the cooling air discharge portion and the cooling air intake portion from above;
Equipped with a,
The engine unit, dust cover and the recoil starter across the engine body on the opposite side, characterized by Rukoto a cooling fan for blowing cooling air. The cover part is
A discharge portion cover portion covering the cooling air discharge portion from above;
The dust-proof cover according to claim 1, further comprising: a cooling air intake cover portion that communicates with the cooling fan and covers a gap as the cooling air intake portion that opens upward. The engine unit is
A fuel tank arranged on the opposite side of the cylinder across the crankshaft,
An exhaust device disposed on one side of the cylinder perpendicular to the crankshaft;
A carburetor disposed on the other side of the cylinder opposite to the exhaust device,
The cooling air intake cover part is
A first cover portion covering a gap between the recoil starter and the fuel tank;
A second cover portion covering a gap between the fuel tank and the vaporizer;
A third cover portion covering a gap between the fuel tank and the exhaust device;
The dustproof cover according to claim 2, comprising at least one of the following. The first fixing part is
The dust-proof cover according to any one of claims 1 to 3, further comprising a guide portion that extends from an inner peripheral edge of the opening portion to an outer side in an axial direction of the crankshaft.   An engine unit comprising the dust cover according to any one of claims 1 to 4.

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