WO2017150546A1

WO2017150546A1 - Engine

Info

Publication number: WO2017150546A1
Application number: PCT/JP2017/007843
Authority: WO
Inventors: 延広渡辺; 山口　直樹
Original assignee: ヤンマー株式会社
Priority date: 2016-03-03
Filing date: 2017-02-28
Publication date: 2017-09-08
Also published as: JP2017155701A; JP6397840B2

Abstract

Provided is an engine wherein the engine bay is prevented from becoming wet, by having a configuration wherein coolant that has leaked from a reserve tank is sprayed to the exterior by a cooling fan. This engine (1) comprises: a fan case (13) that is provided on the side surface of a radiator (9) and has an in-built cooling fan (12) that intakes air from the radiator (9) side and discharges air to the opposite side from the radiator (9), a reserve tank (22) that stores coolant that has overflowed from the radiator (9), an overflow pipe (23) that connects the radiator (9) and the reserve tank (22), an insertion port (22D) provided to the reserve tank (22) and into which the overflow pipe (23) is inserted, and a passage (13G) that is provided to the fan case (13) beneath the insertion hole (22D) and that draws coolant that has overflowed from the gap between the insertion hole (22D) and the overflow pipe (23) to the cooling fan (12) or the air discharge side of the cooling fan (12).

Description

engine

The present invention relates to an engine, and more particularly to an engine having a reserve tank for storing cooling water overflowing from a radiator.

Conventionally, an engine in which a fuel tank and a radiator are arranged adjacent to each other on a cylinder block is known (see Patent Document 1). Such an engine is provided with a reserve tank for storing cooling water overflowing from the radiator. Normally, the cooling water overflows from the radiator when it reaches a high temperature during operation, and is stored in a reserve tank through an overflow pipe. And if the temperature of a radiator falls, cooling water will return to a radiator from a reserve tank through an overflow pipe. When the engine is inclined during operation, the cooling water in the reserve tank may overflow from the clearance of the overflow pipe insertion port of the reserve tank.

As a countermeasure when the cooling water in the reserve tank overflows, for example, in Patent Document 2, the reserve tank is an engine installed on the upper part of a cylindrical fan case that covers the cooling fan, and overflows from the reserve tank. A configuration is disclosed in which cooling water is guided along the outer periphery of the fan case and discharged to the lower side of the engine.

JP 2013-151913 A Japanese Patent No. 5510666

However, according to the configuration in which cooling water overflowing from the reserve tank is discharged to the lower side of the engine as in Patent Document 2, when the engine is installed in a place where the lower side is not opened, the discharged cooling water is installed in the engine. It will wet the place and is not convenient.

An object of the present invention is to provide an engine that does not wet the installation location of the engine by scattering cooling water overflowing from the reserve tank to the outside by a cooling fan.

An engine according to the present invention is provided on a radiator, a fan case provided on a side surface of the radiator, a cooling fan that takes in air from the radiator side and exhausts the air to the opposite side of the radiator, and an upper side of the fan case. A reserve tank for storing cooling water overflowing from the radiator; an overflow pipe for communicating the radiator and the reserve tank; an insertion port provided in the reserve tank into which the overflow pipe is inserted; and the fan case And a passage for guiding cooling water overflowing from a gap between the insertion port and the overflow pipe to the cooling fan or the exhaust side of the cooling fan. .

In the engine of the present invention, it is preferable that the passage is constituted by a groove and / or a through hole.

According to the above engine, the cooling water overflowing outside from the reserve tank is guided along the passage, and is scattered into the atmosphere by the cooling fan to diffuse and evaporate. Easy to use without getting wet.

Further, according to the engine, the passage can be easily formed by a groove and / or a through hole.

It is a front side perspective view of an engine. It is a rear surface side perspective view of an engine. FIG. 4 is an enlarged right side view of the periphery of the radiator, the reserve tank, and the fan case with the radiator cover and the side cover removed. FIG. 5 is an enlarged plan view of the periphery of the radiator, the reserve tank, and the fan case with the radiator cover and the side cover removed. It is an enlarged plan view of a reserve tank and a fan case periphery of the state which removed the radiator cover of the other form. It is an enlarged plan view of a reserve tank and a fan case periphery of the state which removed the radiator cover of the other form. FIG. 7 is an enlarged right side view of the periphery of a radiator, a reserve tank, and a fan case in a state where a radiator cover and a side cover of another form are removed.

<Overall engine configuration>
FIG. 1 is a front perspective view of the engine, and FIG. 2 is a rear perspective view of the engine. In the drawing, the front-rear direction, the left-right direction, and the up-down direction of the engine are shown.

Engine 1 is a horizontal water-cooled diesel engine. In the engine 1, a cylinder head 3 is provided in front of the cylinder block 2. Above the cylinder head 3, an air cleaner 4 and a muffler 5 are provided side by side. A gear case 6 is provided on the left surface of the cylinder block 2. A flywheel 7 is provided on the right surface of the cylinder block 2. Two support legs 8 that support the cylinder block 2 are attached to the lower surface of the cylinder block 2.

The radiator 9 and the fuel tank 10 are provided side by side on the upper surface of the cylinder block 2. A lifting tool 11 that can lift the entire engine 1 is provided on the upper surface of the cylinder block 2. A fan case 13 in which a cooling fan 12 (see FIG. 3) is provided is provided on the right surface of the radiator 9. A cooling air outlet screen 14 is provided on the right surface of the fan case 13. A cooling air inlet screen 15 is provided on the left surface of the radiator 9. The upper surfaces of the radiator 9, the fan case 13, the cooling air outlet screen 14 and the cooling air inlet screen 15 are covered with a radiator cover 93.

Also, on the rear surface of the fuel tank 10, there are provided a light 16 for illumination, reflectors 17 disposed on the left and right of the light 16, and a light cover 18 surrounding the light 16 and the reflector 17. A left side cover 19 A and a right side cover 19 B connected to the light cover 18 are provided on the left side surface and the right side surface of the fuel tank 10.

In the cylinder block 2, a crankshaft 20 is installed in the left-right direction. The crankshaft 20 is rotatably supported by the cylinder block 2 via a bearing (not shown). The right end portion of the crankshaft 20 protrudes from the right surface of the cylinder block 2. A flywheel 7 is attached to the right end portion of the crankshaft 20.

Also, a liner (not shown) is provided in the front and rear horizontal direction at the front of the cylinder block 2. In the cylinder block 2, a water jacket (not shown) through which cooling water flows is formed around the liner. The water jacket opens at the upper surface of the cylinder block 2. The water jacket communicates with a cooling water passage (not shown) formed in the cylinder head 3.

Also, a piston (not shown) is provided in the liner so as to be able to reciprocate (slide) in the horizontal direction. The piston is connected to the crankshaft 20 via a connecting rod (not shown). The reciprocating motion of the piston is converted into the rotational motion of the crankshaft 20 through the connecting rod. A combustion chamber (not shown) is formed between the liner, the piston, and the cylinder head 3.

<Cooling fan>
3 is an enlarged right side view around the radiator 9, the reserve tank 22 and the fan case 13 with the radiator cover 93 and the side covers 19A and 19B removed, and FIG. 4 is a state with the radiator cover 93 and the side covers 19A and 19B removed. FIG. 2 is an enlarged plan view of the periphery of the radiator 9, reserve tank 22, and fan case 13. The cooling fan 12 has a fan shaft 12 A at the center of rotation, is covered with a fan case 13, and is provided on the right surface of the radiator 9. 12 A of fan shafts are arrange | positioned in the left-right direction in the fan case 13, and are rotatably supported by the fan case 13 via a bearing (not shown). A fan pulley 121 is provided on the fan shaft 12A. A fan belt 21 is wound around the fan pulley 121. The fan belt 21 is wound on a crank pulley (not shown) provided on the crankshaft 20 and inside the flywheel 7, and transmits the power of the crankshaft 20 to the cooling fan 12.

The cooling fan 12 takes in air from the radiator 9 side and exhausts it to the opposite side of the radiator 9. That is, when the cooling fan 12 rotates, the cooling air flows into the internal passage in the radiator 9 from the cooling air inlet screen 15 and is discharged from the cooling air outlet screen 14 to the outside of the engine 1. Thereby, the radiator 9 is cooled by the cooling air of the cooling fan 12.

<Fan case>
The fan case 13 is an integrally molded product such as resin, and has a substantially cylindrical fan accommodating portion 13A that accommodates the cooling fan 12, and a substantially square shape that is formed substantially along the left circular surface of the fan accommodating portion 13A. And an attachment frame 13B. Two mounting holes (not shown) are formed in the mounting frame 13B, and bolts 131 are inserted into the mounting holes and fastened to the radiator frame 92. Two attachment holes (not shown) are formed in the lower portion of the fan accommodating portion 13A, and a bolt 132 is inserted into each attachment hole and fastened to the right surface of the cylinder block 2.

Two mounting

holes

13C and 13D are formed at the right end of the fan accommodating portion 13A. A cooling air outlet screen 14 is fixed to each mounting

hole

13C, 13D with a bolt 141 (see FIG. 1). The fan housing portion 13A has an attachment hole 13E formed so as to penetrate the protrusion protruding from the front upper portion in the vertical direction, and an attachment formed so as to penetrate the protrusion protruding from the upper portion in the vertical direction. A hole 13F is provided. A radiator cover 93 is fixed to the mounting

holes

13E and 13F with bolts 931 (see FIGS. 1 and 2).

<Radiator>
As shown in FIG. 3, the radiator 9 includes a radiator core (not shown), an upper tank 91, a radiator frame 92, a radiator cover 93 (see FIGS. 1 and 2), and a radiator cover stay 94. .

The radiator core is accommodated in the radiator frame 92. In the radiator core, a plurality of cooling water tubes through which cooling water flows are arranged in the vertical direction. A plurality of radiating fins are arranged between the cooling water tubes.

The upper tank 91 is arranged on the upper side of the radiator core and is supported by the radiator frame 92. An upper end portion of the cooling water tube is inserted into the upper tank 91 so that the upper tank 91 and the cooling water tube communicate with each other. A replenishing port 91 A for replenishing cooling water is provided on the upper surface of the upper tank 91. A radiator cap 911 is attached to the supply port 91A.

The radiator frame 92 is erected on the upper surface of the cylinder block 2 and supports the radiator core and the upper tank 91.

The radiator cover stay 94 is a U-shaped plate member that supports the radiator cover 93. The radiator cover stay 94 is disposed so as to straddle the upper surface of the upper tank 91 on the left side of the supply port 91A in the front-rear direction. Then, both end portions of the radiator cover stay 94 are joined to the radiator frame 92 by brazing or the like. Further, the central portion of the radiator cover stay 94 is joined to the upper surface of the upper tank 91 by brazing or the like.

Mounting

holes

94A and 94B are formed in positions near the front and rear ends of the upper surface of the radiator cover stay 94 and offset leftward from the upper tank 91. A radiator cover 93 is fixed to the mounting

holes

94A and 94B with bolts 932 (see FIGS. 1 and 2).

<Reserve tank and passage>
A reserve tank 22 is provided above the fan case 13. The reserve tank 22 is a tank that stores cooling water overflowing from the radiator 9. The reserve tank 22 and the radiator 9 are communicated by being connected by an overflow pipe 23.

The reserve tank 22 is surrounded by the upper portion of the fan accommodating portion 13A, the front portion of the seam welded portion 10A of the fuel tank 10, the front surface of the fuel tank 10, the right side surface of the upper tank 91, and the inner surface of the radiator cover 93. Arranged in space. The upper portion of the fan housing portion 13A refers to the upper half portion of the cylindrical shape. By arranging the reserve tank 22 in this space, there is no need to provide a space for arranging the reserve tank 22 between the radiator 9 and the fuel tank 10 or between the radiator 9 and the muffler 5.

The lower surface of the reserve tank 22 includes an arc-shaped surface along the outer shape of the upper portion of the fan housing portion 13A and a flat surface 22A along the upper surface of the seam welded portion 10A. Two projections 22B projecting obliquely downward are formed on the flat surface 22A. A mounting hole 10B is formed in the seam welded portion 10A so as to face the protruding portion 22B. And the lower part of the reserve tank 22 is fixed to the front-back, left-right, and an up-down direction by inserting the protrusion part 22B in the attachment hole 10B. The protrusion 22B may be fixed to an attachment stay (not shown) such as the fuel tank 10. Thus, by using the protrusion 22B, it is possible to reduce the number of mounting steps and the number of parts of the reserve tank 22.

A band or a buffer material (not shown) can be used for fixing the upper portion of the reserve tank 22. For example, a band that winds the upper and left and right side surfaces of the reserve tank 22 and the inside of the upper portion of the fan accommodating portion 13A can be used. Further, for example, a cushioning material filled between the upper surface of the reserve tank 22 and the inner surface of the radiator cover 93 can be used.

An insertion port 22D into which the overflow pipe 23 is inserted is formed on the front surface 22C inclined obliquely upward of the reserve tank 22. The overflow pipe 23 extends straight rearward and downward from the insertion port 22 D to the vicinity of the lowest bottom of the reserve tank 22 in the reserve tank 22, and bends leftward from the insertion port 22 D outside the reserve tank 22. 91A is connected to the side surface.

Thus, since the overflow pipe 23 in the reserve tank 22 can reach the bottom in a straight line shape, the overflow pipe 23 can have a simple shape. Further, since the reserve tank 22 is narrowed toward the lower part, the cooling water in the reserve tank 22 can be reliably returned to the radiator 9 by the overflow pipe 23 when returning the cooling water to the radiator 9.

A notch 22E that connects the inside and the outside of the reserve tank 22 is formed at the upper end of the inner peripheral surface of the insertion port 22D. In the present embodiment, the notch 22E is a groove having a semicircular end surface. The notch 22E functions to keep the inside of the reserve tank 22 at the external pressure at normal times. However, if the engine 1 is inclined, the cooling water in the reserve tank 22 may overflow from the notch 22E to the outside. Instead of providing the notch 22E, the insertion opening 22D and the overflow pipe 23 may be loosely fitted. Also in this case, when the engine 1 is inclined, the cooling water overflows from the gap between the insertion port 22D and the overflow pipe 23 to the outside.

A passage 13G is formed in a lower portion of the insertion port 22D in the fan case 13, more specifically, in a portion including the outer peripheral surface of the upper portion of the fan accommodating portion 13A and immediately below the lower end portion of the insertion port 22D. The passage 13G is a groove extending in the left-right direction that guides the cooling water overflowing from the notch 22E to the exhaust side of the cooling fan 12. The left end portion of the passage 13G is located on the left side of the lower end portion of the insertion port 22D, and the right end portion is located on the right end portion of the fan accommodating portion 13A and is opened to the right. The shape of the groove is not particularly limited, and may be a curved shape in addition to a linear shape. The cross-sectional shape of the groove is not particularly limited, and may be an arc shape or a polygonal shape in addition to the curved shape.

With this configuration, the cooling water overflowing from the notch 22E flows to the lower end along the insertion port 22D, falls from the lower end of the insertion port 22D to the passage 13G, flows to the right through the passage 13G, and the right end of the passage 13G. To the exhaust side of the cooling fan 12. The dropped cooling water is blown to the right side of the engine 1 by the air blown by the cooling fan 12 and diffused and evaporated.

In this way, the cooling water overflowing from the reserve tank 22 is scattered into the atmosphere by the cooling fan 12 and diffused and evaporated, so that the overflowing cooling water does not wet the installation location of the engine 1 and is easy to use. Is good.

The above-described passage 13G may have another form, for example, a form as shown in FIG. 5 or FIG. The passage 13H shown in FIG. 5 is an elliptical through hole. The passage 13H is formed so as to vertically penetrate the upper portion of the fan housing portion 13A located immediately below the lower end portion of the insertion port 22D. The shape of the through hole is not particularly limited, and may be circular or polygonal.

With this configuration, the cooling water overflowing from the notch 22E flows to the lower end along the insertion port 22D, falls from the lower end of the insertion port 22D to the passage 13H, and falls onto the cooling fan 12 through the passage 13H. The dropped cooling water is blown to the right side of the engine 1 by the air blown by the cooling fan 12 and diffused and evaporated.

6 is formed by a groove 13J and a through hole 13K. The groove 13J is formed on the outer peripheral surface of the upper portion of the fan accommodating portion 13A and including a portion directly below the lower end portion of the insertion port 22D. The left end portion of the groove 13J is located on the left side of the lower end portion of the insertion port 22D, and the right end portion is located near the right end portion of the fan accommodating portion 13A. A through hole 13K is formed at the right end of the groove 13J. The through hole 13K penetrates the upper portion of the fan accommodating portion 13A in the vertical direction.

With this configuration, the cooling water overflowing from the notch 22E flows to the lower end along the insertion port 22D, falls from the lower end of the insertion port 22D to the groove 13J, flows rightward through the groove 13J, and passes through the through hole 13K. Falls on the cooling fan 12. The dropped cooling water is blown to the right side of the engine 1 by the air blown by the cooling fan 12 and diffused and evaporated.

As described above, the passage that guides the cooling water overflowing from the gap between the insertion port 22D and the overflow pipe 23 to the cooling fan 12 or the exhaust side of the cooling fan 12 is constituted by a groove and / or a through hole provided in the fan case 13. can do.

Further, the reserve tank 22 may have another form, for example, a form as shown in FIG. The reserve tank 22 shown in FIG. 3 is arranged on the rear side of the upper portion of the fan accommodating portion 13A, whereas the reserve tank 24 shown in FIG. 7 is symmetrical with the reserve tank 22 in the front-rear direction and is located in the upper portion of the fan accommodating portion 13A. Arranged on the front side. The reserve tank 24 is formed with an insertion port 24D in which a notch 24E is formed. A band (not shown) can be used for fixing the reserve tank 24. The overflow pipe 25 and the passage 13M are also arranged symmetrically.

The operation and effect similar to the above can be obtained also by the configuration of the reserve tank 24 and the passage 13M.

The present invention can be used for an engine.

1 Engine 9 Radiator 12 Cooling fan 13 Fan case 13G Passage (groove)
13H passage (through hole)
13I passage (groove and through hole)
13M passage (groove)
13J Groove 13K Through-hole 22 Reserve tank 22D Insertion port 23 Overflow pipe 24 Reserve tank 24D Insertion port

Claims

With radiator,
A fan case that is provided on a side surface of the radiator and includes a cooling fan that sucks air from the radiator side and exhausts the air to the opposite side of the radiator;
A reserve tank that is provided on the upper side of the fan case and stores cooling water overflowing from the radiator;
An overflow pipe for communicating the radiator and the reserve tank;
An insertion port provided in the reserve tank and into which the overflow pipe is inserted;
An engine provided in a lower portion of the fan case at the insertion port, and a passage for guiding cooling water overflowing from a gap between the insertion port and the overflow pipe to the cooling fan or an exhaust side of the cooling fan.
The engine according to claim 1, wherein the passage is a groove and / or a through hole.