JP7013536B2 - engine - Google Patents

Description

The present invention relates to an engine in which a fuel tank is arranged on the upper surface of the engine body and a protective member is arranged to cover the side surface of the fuel tank.

Conventionally, in consideration of engine miniaturization and convenience, a configuration has been known in which a fuel tank for storing fuel, a radiator for cooling the cooling water of the engine, and the like are arranged adjacent to each other on the upper surface of the engine. Specifically, for example, a horizontal water-cooled diesel engine in which an engine body composed of a cylinder head, a cylinder block, and a crankcase is arranged in the lateral direction is known (see, for example, Patent Document 1). A fuel tank is arranged in front of the upper surface of the engine body, and a radiator for cooling the cooling water of the engine is arranged on the rear side adjacent to the fuel tank. Since such a small engine is compact and easy to use, it is used for various purposes.

In a small engine as described above, it is assumed that it will be used in various situations, and a protective member that protects the fuel tank and radiator arranged on the upper surface of the engine body from the side may be arranged ( For example, see Patent Document 2). In recent years, when arranging such a protective member, it has come to be considered to improve the design and appearance.

Japanese Unexamined Patent Publication No. 2006-083780 Japanese Patent No. 5049923

In the above-mentioned small engine, since the fuel tank, radiator, etc., which are large parts, are arranged on the upper surface of the engine body, the space in the upper part of the engine body is limited, and the protective member covering the sides is limited. When arranging the fuel tank, for example, it is fixed via a stay welded to a flange surface formed on the side surface of the fuel tank. However, since the fuel tank is made of a thin sheet metal steel plate, there is a problem that the strength of the flange is relatively weak and the mounting accuracy is low.

Further, on the side of the radiator, a large duct for introducing cooling air into the space where the cooling water passage is arranged is arranged. When covering the duct and attaching a protective member (screen) having a ventilation function to the side, the protective member is directly attached to this duct. Since this duct is for guiding air, it is made of a thin steel plate. Therefore, even when the protective member is attached to the duct, it is difficult to secure the attachment strength as in the case of attaching the protective member to the fuel tank described above. Further, even if the protective member is attached to each of the fuel tank and the radiator, there is a problem that it becomes difficult to secure the attachment accuracy due to the distortion of each component due to the heat generated from the engine or the like.

The present invention has been made in view of the above facts, and its main technical problem is to secure mounting strength and mounting accuracy in a mounting structure of a protective member that covers components arranged on the upper part of the engine body from the side. Is to provide the engine.

In order to solve the above-mentioned main technical problem, according to the present invention, a fuel tank and a radiator are provided above the engine body, the radiator is arranged behind the fuel tank, and a protective member is provided on the side of the radiator. An engine is provided in which a support for mounting is placed.

The support can be configured to be attached to the radiator.

A fuel tank bracket for fixing the fuel tank may be provided, and the fuel tank bracket may support the protective member.

The support portion includes a protective member mounting surface on which the protective member is mounted and a radiator mounting surface on which the radiator is mounted, and is configured such that the protective member mounting surface and the radiator mounting surface are provided in parallel. Is preferable.

The engine of the present invention can secure the mounting strength of the protective member, is less susceptible to distortion due to heat from the engine body, maintains the mounting position accuracy of the protective member, and does not impair the appearance.

It is a perspective view of the 1st Embodiment of the horizontal type engine configured based on this invention. It is a perspective view for demonstrating the mounting structure to which the protection member (side cover, screen) of the horizontal engine shown in FIG. 1 is attached. It is a perspective view seen from the right diagonal rear with the radiator removed in order to explain the state which attached the side cover of the horizontal engine shown in FIG. It is a partial perspective view of a horizontal engine seen from diagonally right rear to explain the state where the screen is attached to the radiator. It is a perspective view for demonstrating the 2nd Embodiment of the mounting structure which mounts a screen with respect to the horizontal engine of this invention. It is a schematic diagram explaining the structure of the 4th stay of the 2nd Embodiment shown in FIG. 5, and the duct.

Hereinafter, the first embodiment of the mounting structure of the protective member configured based on the present invention will be described with reference to the accompanying drawings.

The engine 1 shown in FIGS. 1 and 2 is a single-cylinder water-cooled horizontal diesel engine (hereinafter referred to as “horizontal engine”). In the description of this horizontal engine, the longitudinal direction of the engine indicated by the arrow X in FIG. 1 is the front-rear direction, the width direction of the engine indicated by the arrow Y is the left-right direction, and the height direction of the engine indicated by the arrow Z is the up-down direction. do.

As shown in FIGS. 1 and 2, the horizontal engine 1 includes an engine main body 4 in which a cylinder head 3 is arranged behind a cylinder block 2. A fuel tank 20 for supplying fuel to the horizontal engine 1 is arranged in the upper front portion of the cylinder block 2. The upper part of the fuel tank 20 is composed of a tank cover 21. As shown in FIG. 2, a radiator 5 whose upper surface is covered with a radiator cover 8 is disposed on the upper surface of the cylinder block 2 on the rear side of the fuel tank 20. Note that FIG. 2 shows a state in which the right side of the radiator cover 8 is partially cut out for convenience of explanation.

Headlamps 30 are arranged on the front side of the fuel tank 20, and first protective members (side covers) 7 are arranged on the left and right sides of the fuel tank 20. Further, a top cover 40 that covers the mounting structure on the front side of the fuel tank 20 is arranged between the front end of the tank cover 21 of the fuel tank 20 and the upper end of the headlamp 30.

As shown in FIG. 2, the radiator 5 is continuously arranged at the rear end of the tank cover 21 of the fuel tank 20 and continuously at the rear end of the left and right side covers 7. The mesh-shaped vent 13 is formed and covered with the left and right second protective members (screens) 9.

A fuel cap 10 is provided in the center of the upper surface of the fuel tank 20, and is arranged in the center of the tank cover 21. A radiator cap 11 is arranged at the center of the radiator cover 8, and a suspension bolt 12 for lifting the horizontal engine 1 at the position of the center of gravity is projected in front of the radiator cap 11.

Behind the engine body 4, an air cleaner 15 that supplies intake air to a combustion chamber (not shown) formed in the cylinder head 3 of the horizontal engine 1 and exhaust gas discharged from the combustion chamber are discharged to the outside. The muffler 16 is arranged on the left and right. In FIG. 2, the air cleaner 15 and the muffler 16 are omitted.

A crank shaft (not shown) is rotatably arranged inside the cylinder block 2 in a posture along the left-right direction, and a flywheel 19 is attached to the left end of the crank shaft as shown in FIG. There is. The flywheel 19 is rotated at the time of starting to facilitate the engine start, and acts to suppress the rotation fluctuation of the crank shaft after the horizontal engine 1 is started.

The mounting structure of the protective member (first protective member (side cover 7), second protective member (screen 9)) configured based on the present invention with reference to FIGS. 2 and 3 will be described. do. Note that FIG. 3 is a view seen from diagonally right rear of the fuel tank 20, and for convenience of explanation, shows a view in which the radiator 5, the radiator cover 8, the screen 9, and the like are omitted.

As shown in FIG. 2, a headlamp 30, a top cover 40, and a lamp bracket 50 formed of aluminum die cast for attaching the left and right side covers 7 are arranged at the front portion of the fuel tank 20 (. In the figure, only the mounting portion 50a for fixing the tip portion of the side cover 7, which is a part of the lamp bracket 50, is visible). The lamp bracket 50 is arranged and fixed at the front upper end corner of the cylinder block 2 (not shown). The upper surface and the front side surface of the cylinder block 2 are formed as surfaces with high processing accuracy, and ensure high mounting accuracy of the lamp bracket 50 fixed to the upper end corner portion of the cylinder block 2.

As shown in FIG. 3, on the upper surface 2a of the cylinder block 2 of the engine body 4, immediately after the fuel tank 20, that is, at a position between the fuel tank 20 and the radiator 5, it extends in the left-right direction and forms a substantially plate shape. A fuel tank bracket 90 made of aluminum die-cast is attached. The fuel tank bracket 90 has a plate-shaped base 92 fixed to the upper surface 2a of the cylinder block 2 with a plurality of bolts 91 (only a part thereof is shown in the figure), and a plate-shaped leg extending upward from the plate-shaped base 92. A tank mounting plate portion 94 having a horizontal mounting support surface for mounting and supporting the flange portion 23 of the fuel tank 20 at the upper end position of the plate-shaped leg portion 93, and the right side of the plate-shaped leg portion 93. It is integrally formed with a plate-shaped protective member mounting plate portion 95 extending to the above.

Thick first mounting portions 96 for fixing the flange 23 of the fuel tank 20 are formed on both left and right sides of the tank mounting plate portion 94, and the tank mounting plates correspond to substantially the center positions in the width direction of the horizontal engine 1. A second mounting portion 97 for mounting the suspension bolt 12 is formed at the central portion in the left-right direction of the portion 94.

The flange 23 of the fuel tank 20 is mounted on the mounting support surface of the tank mounting plate portion 94 via the plate-shaped anti-vibration rubber 100, and the radiator cover 8 is mounted on the upper surface of the flange 23 of the fuel tank 20. Bracket 110 is placed via the anti-vibration rubber 101. In this mounted state, the flange 23 of the fuel tank 20 and the bracket 110 are fastened together and fixed to the first mounting portion 96 of the tank mounting plate portion 94 by bolts 102 from above. By fixing in this way, the rear side of the fuel tank 20 can be attached with less vibration.

Thick stay mounting portions 98 are formed on the upper and lower ends on the right end side of the protective member mounting plate portion 95 of the fuel tank bracket 90, and the side covers 7 and the screen 9 are mounted on both stay mounting portions 98. The first stay 120 is fixed with a bolt 123.

As can be understood from FIGS. 2 and 3, the first stay 120 includes a metal stay body 121 formed by bending in a substantially U shape open to the right in the front-rear direction, and the stay body 121 is provided. Mounting pieces 122 for fixing the upper and lower ends of the cover connecting portion 71 of the side cover 7 are formed by bending upward at both tip portions of the above. Bolts 124 are erected on the mounting piece 122 by welding so as to project outward.

Further, as shown in FIG. 2, a second stay 130 having a substantially shape formed for mounting the front end portion of the screen 9 is arranged on the mounting piece 122 of the first stay 120. The second stay 130 has an opening 131 having a diameter that allows the bolt 124 erected in the mounting piece 122 to pass through at both ends in the vertical direction, and the front end portion of the screen 9 is formed at a substantially central portion in the vertical direction. A mounting portion 132 for mounting the above is formed. As shown in FIG. 3, the mounting portion 132 is welded with a nut 134 to which a bolt with a knob 133 used for fixing the screen 9 is screwed on the back surface side. The mounting portion 132 is arranged so as to be offset to the rear side with respect to the straight line connecting the bolts 124 formed above and below the first stay 120.

When attaching the side cover 7 to the horizontal engine 1, first, the bolt 124 is held by penetrating the openings 72 formed above and below the cover connecting portion 71 of the side cover 7, and the tip portion of the side cover 7 is held. It is fixed to the mounting portion 50a of the lamp bracket 50 by using the bolt 87. Then, the cover connecting portion 71 is fixed to the first stay 120 with the second stay 130 in between by the nut 125 screwed to the bolt 124. In this way, the front end side of the side cover 7 is fixed to the lamp bracket 50, and the rear end side is fixed to the fuel tank bracket 90 for positioning. Further, in the present embodiment, by fixing the upper center portion of the side cover 7 to the stay 25 arranged on the flange 23 of the fuel tank 20 with bolts 87, it is possible to further prevent fluttering when vibration occurs. A recess 72 opened rearward is formed in the center of the cover connecting portion 71 in the vertical direction, and the mounting portion 132 of the second stay 130 is exposed from the recess 73.

Next, the mounting structure of the second protective member (screen) 9 continuously arranged behind the side cover 7 will be described. As can be seen from FIG. 2, the screen 9 is attached to the horizontal engine 1 via a second stay 130 and a third stay 140 fixed to the radiator 5 adjacent to the rear of the duct 150.

FIG. 4A shows a view of the right side of the horizontal engine 1 as viewed from the rear in the front-rear direction, and for convenience of explanation, the radiator cover 8 and the screen 9 are vertically arranged at the lateral position of the third stay 140. It is shown in a cross section cut in the direction.

The third stay 140 is formed by bending a cold-rolled steel plate (SPCC) having a thickness of about 3 mm, and has a substantially triangular shape having a top on the right side. An opening is formed in the mounting portion 141 formed at the top of the third stay 140, and as shown in FIG. 4B, a bolt with a knob of the screen 9 described later is screwed on the back surface side of the mounting portion 141. The nut 142 to be fitted is welded. Further, a mounting piece 143 bent for mounting on the radiator 5 is formed at both upper and lower ends of the third stay 140, and an opening through which the bolt 87 penetrates is formed in each mounting piece 143 (not shown). ) Is formed.

As shown in FIG. 4B, a cover plate 5a having an opening in the center is arranged on the right side surface of the radiator 5 so that the cooling air passes through the cooling passage of the radiator 5. The third stay 140 is fixed by bolts 87 at a position adjacent to the rear side of the duct 150 of the cover plate 5a with the flange 151 of the duct 150 interposed therebetween.

When attaching the screen 9, as shown in FIG. 2, the front end side of the screen 9 is overlapped with the cover connecting portion 71 of the side cover 7, and the second stay 130 and the second stay 130 are provided by the front and rear knob bolts 133 of the screen 9. It is fixed to the mounting portions 132 and 141 of the third stay 140.

As described above, the side cover 7 is fixed to the fuel tank bracket 90 that fixes the fuel tank 20 to the upper surface of the engine body 4 via the first stay 120. The fuel tank bracket 90 has sufficient strength to support the heavy fuel tank 20, and is fixed in a state where the mounting strength is higher than when the side cover 7 is fixed to the flange 23 or the like of the fuel tank 20. The mounting accuracy is high, and the appearance is not impaired. Further, the screen 9 is fixed to a second stay 130 attached to the fuel tank bracket 90 via the first stay 120 on the front end side, and thicker than the duct 150 attached to the radiator 5 on the rear end side. It is fixed via the third stay 140 of the above. The duct 150 that introduces cooling air into the radiator 5 is made of a thin steel plate of about 1 mm, and the strength of the duct 150 itself is low. When the screen 9 is attached to the duct 150, the mounting strength and mounting accuracy of the screen 9 are ensured. Is difficult. On the other hand, in the present embodiment, the screen 9 is fixed to the fuel tank bracket 90 by the second stay 130 and to the radiator 5 by the third stay 140. As a result, the mounting strength and mounting accuracy of the screen 9 can be ensured.

The present invention is not limited to the above-mentioned first embodiment, and various modifications can be assumed as long as it is included in the technical scope of the present invention. The second embodiment will be described below with reference to FIGS. 5 and 6.

The second embodiment is different from the first embodiment in the mounting structure on the rear end side of the screen 9, and the other structures are the same as those in the first embodiment. Therefore, the mounting structure on the rear end side of the screen 9 will be described, and the description of other configurations will be omitted.

In the first embodiment, the third stay 140 is configured separately from the duct 150, and the screen 9 is attached to the radiator 5 via the third stay 140. Instead of this, in this second embodiment, the fourth stay 145 is formed in the shape of a rectangular plate, and the fourth stay 145 further constitutes one side surface on the rear side of the duct 155. Specifically, as shown in FIGS. 5 and 6, the fourth stay 145 is formed of a rectangular plate material with, for example, a 3 mm thick SPCC, and the rear side of the screen 9 is fixed by a bolt with a knob 133. The mounting portion 146 of the above is formed by bending. An opening through which the bolt with knob 133 penetrates and a nut into which the bolt with knob 133 is screwed are welded and fixed to the mounting portion 146 on the back surface side thereof. The duct 155 is composed of the fourth stay 145 and the U-shaped frame body 156 constituting the other three side surfaces. This frame 156 is made by bending a thin SPCC plate having a thickness of 1 mm, and is composed of an upper side surface 156a, a front side surface 156b, and a lower side surface 156c when attached to the radiator 5, and is a U-shaped frame body 156. A mounting piece 158 bent to weld a fourth stay 145 is formed at both ends of the open space. A flange 157 for mounting the duct 155 on the radiator 5 is formed on the side surface 156b, and an opening 157a through which a mounting bolt (not shown) penetrates is formed. Further, the fourth stay 145 is also formed with a flange 147 for mounting the duct 155 to the radiator 5, and the flange 147 is formed with an opening 147a for passing a mounting bolt (not shown). As shown in the figure, a stepped portion 159 with which the horizontal end portion of the flange 147 engages is formed at the corner portion of the side surface 156a and the side surface 156c.

As shown in the figure, the duct 155 is formed by welding the fourth stay 145 to the bent portion 158 of the frame body 156. Each x mark shown in the figure indicates a place to be welded. In this embodiment, in order to further secure the strength of the duct 155, a reinforcing member for connecting the central portion of the fourth stay 145, the side surface 156a constituting the frame body 156, and the substantially central portion of the side surface 156c. 160 is arranged. The thickness of the connecting member 160 is formed to be thinner than the thickness of the fourth stay 145 (for example, 3 mm) and thicker than the thickness of the frame body 156 (for example, 1 mm) (for example, 1.6 mm). As a result, while ensuring the mounting strength and accuracy of the fourth stay 145, the weight of the duct 155 does not increase more than necessary, and the strength of the entire tact 155 is ensured.

The duct 155 configured as described above is attached to the radiator 5 as shown in FIG. 5, and the front end side of the screen 9 is attached to the second stay 130 by the knob-attached bolt 133 as in the first embodiment. Further, the rear end side of the screen 9 is fixed to the mounting portion 146 of the fourth stay 145 by the bolt with knob 133. As a result, the same effect as that of the first embodiment described above can be obtained.

In the present invention, the front end side of the screen 9 is fixed to the fuel tank bracket 90 via the second stay 130, and the rear end side of the screen 9 is fixed to the fuel tank bracket 90 via the third stay 140 or the fourth stay 145. The mounting strength and mounting accuracy can be improved not only by fixing to the radiator 5 but also by adopting only one of the mounting structures on the front end side and the rear end side described above.

1: Horizontal engine 2: Cylinder block 3: Cylinder head 4: Engine body 5: Radiator 7: First protective member (side cover)
8: Radiator cover 9: Second protective member (screen)
10: Fuel cap 11: Radiator cap 12: Hanging bolt 13: Vent 15: Air cleaner 16: Muffler 19: Flywheel 20: Fuel tank 21: Tank cover 23: Flange 30: Head lamp 40: Top cover 50: Lamp bracket 71 : Cover connecting part 90: Fuel tank bracket 92: Plate-shaped base 93: Plate-shaped leg 94: Tank mounting plate 95: Protective member mounting plate 96: First mounting 97: Second mounting 98: Stay mounting 120: First stay 130: Second stay 133: Bolt with knob 140: Third stay 145: Fourth stay 150: 155: Duct 160: Reinforcing member

Claims (4)

A fuel tank and radiator are installed above the engine body,
The radiator and the fuel tank are arranged side by side in the first direction orthogonal to the height direction of the engine body .
A support for attaching the protective member is arranged on the side in the second direction orthogonal to both the height direction and the first direction when viewed from the radiator .
The support portion is an engine to which a first protective member covering the side surface of the fuel tank and a second protective member covering the side surface of the radiator can be attached as the protective member . The engine according to claim 1, wherein the support portion is attached to the radiator. A fuel tank bracket for fixing the fuel tank is provided.
The engine according to claim 1, wherein the fuel tank bracket supports the protective member. The support portion includes a protective member mounting surface on which the protective member is mounted and a radiator mounting surface on which the radiator is mounted.
The engine according to any one of claims 1 to 3, wherein the protective member mounting surface and the radiator mounting surface are provided in parallel.

Images