JP2017155702A - engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine, which is not extremely reduced in the suction of cooling air even in the case where dust accumulated to some extent on a cooling air entrance screen, so that it can suppress an output reduction.SOLUTION: An engine 1 comprises: a radiator 9 having a cooling air inlet port 921; a cooing air inlet duct 12 disposed on the entrance side of the cooling air inlet port 921; and a cooling air entrance screen 15 disposed on the entrance side of the cooling air inlet duct 12. The cooling air inlet duct 12 has a cylinder part 122 and a flange part 123. The cooling air entrance screen 15 is constituted to include: an outer frame 152 arranged to protrude along the flange part 123 to the side opposite to the cylinder part 122; an opening 155 formed of the end portion of the outer frame 152 on the side opposite to the cylinder part 122 and made larger than the opening area of the cylinder part 122 on the side of the cooling air entrance screen 15; and an air filter 154 so arranged through a clearance from the flange part 123 as to cover the opening 155.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an engine, and more particularly to a structure for cooling 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). The radiator cooling device is configured in the order of a cooling air inlet screen, a cooling air inlet duct, a radiator case, a cooling fan covered with a fan cover, and a cooling air outlet screen.

  The cooling air inlet screen and the cooling air inlet duct are for preventing inflow of dust and hot air. The cooling air inlet duct has a cylindrical shape, and a cooling air inlet screen is attached so as to cover one opening. Further, a net for preventing the inflow of dust is attached to the cooling air inlet duct side of the cooling air inlet screen.

JP2013-68100A

  As shown in Patent Document 1, a cooling air inlet screen is usually attached along the periphery of the opening of the cooling air inlet duct. That is, the area of the opening of the cooling air inlet duct and the area of the cooling air inlet screen substantially coincide. According to this configuration, dust is uniformly deposited on the entire net by taking in the cooling air.

  If cleaning is not performed for a long time, dust accumulates on the entire cooling air inlet screen and becomes clogged, and the intake amount of cooling air is extremely reduced. In this state, the radiator is insufficiently cooled, and the engine output decreases.

  The present invention is configured so that dust does not easily accumulate near the edge of the cooling air inlet screen, so that even when dust accumulates to some extent on the cooling air inlet screen, the intake amount of cooling air is not extremely reduced, and the output It aims at providing the engine which can suppress a fall.

  The engine includes a radiator having a cooling air intake for taking in the cooling air, a cooling air inlet duct that is provided on an inlet side of the cooling air intake and guides the cooling air to the cooling air intake, and the cooling air inlet duct A cooling air inlet screen that captures dust contained in the cooling air taken in, and the cooling air inlet duct extends from the cooling air inlet toward the cooling air inlet screen; And a flange portion provided at an end portion of the cylindrical portion on the cooling air inlet screen side, and the cooling air inlet screen is disposed so as to protrude to the opposite side of the cylindrical portion along the flange portion. An outer frame, an opening formed on an end of the outer frame opposite to the cylindrical portion, and having an opening larger than an opening area of the cylindrical portion on the cooling air inlet screen side, and the flange so as to cover the opening With a gap A structure having an air filter to be.

  In the engine described above, the cooling air inlet duct may include a screen mounting portion that attaches the cooling air inlet screen to the flange portion.

  In the above-mentioned engine, the cooling air inlet duct may have a duct mounting portion that is attached to the cooling air inlet inside the cylindrical portion.

  In the engine, a length in a direction along the flange from the inner surface of the cylindrical portion in the vicinity of the screen mounting portion to an end portion of the outer frame on the opening portion side may be the flange and the air filter. It is preferable that it is more than the length of the clearance gap.

  According to the above engine, the portion that overlaps the cylindrical portion of the air filter by taking in the cooling air by arranging the air filter with a gap and a gap so as to cover the opening larger than the opening area of the cylindrical portion. Dust is biased toward the surface, and almost no dust is deposited around it. If the air filter is neglected for a long period of time and the air filter begins to become clogged with dust, the suction resistance of the clogged portion increases, so that the suction from the portion of the air filter that is not clogged increases. As a result, even when the air filter is clogged, the cooling air can be taken in from the clogged portion around the clogged portion, so that the amount of cooling air taken in is not extremely reduced. Therefore, it is possible to suppress a decrease in the cooling performance of the radiator and suppress a decrease in the engine output.

  Moreover, according to said engine, a cooling wind inlet screen can be attached using a collar part by providing a screen attachment part in a collar part.

  Further, according to the engine described above, by providing the duct attachment portion inside the cylinder portion, the cylinder portion can be expanded as compared with the case where it is provided outside the cylinder portion, and the flow passage area of the cooling air can be increased.

  Further, according to the above engine, the length in the direction along the flange from the inner surface of the cylindrical portion in the vicinity of the screen mounting portion to the end on the opening side of the outer frame is the length of the gap between the flange and the air filter. With the above configuration, when the air filter is not clogged, almost no air is sucked from the vicinity of the edge of the air filter, and when the air filter starts to be clogged, the cooling air can be taken in well from the vicinity of the edge of the air filter. . Therefore, it is preferable to arrange a larger air filter close to the buttock.

It is a front side perspective view of an engine. It is a rear surface side perspective view of an engine. It is a disassembled perspective view around a radiator. It is a left view of a radiator frame, a cooling air inlet duct, and a cooling air inlet screen. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG.

<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 vertical direction of the engine are shown.

  The 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.

  On the upper surface of the cylinder block 2, a radiator 9 and a fuel tank 10 are provided side by side. 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 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 duct 12 is provided on the left surface of the radiator 9. A cooling air inlet screen 15 is provided on the left surface of the cooling air inlet duct 12. Upper surfaces of the radiator 9, the fan case 13, the cooling air outlet screen 14, the cooling air inlet duct 12, and the cooling air inlet screen 15 are covered with a radiator cover 93.

  The cooling fan takes air from the radiator 9 side and exhausts it to the opposite side of the radiator 9. That is, when the cooling fan 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. Thus, the radiator 9 is cooled by the cooling air from the cooling fan.

  Further, 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 </ b> A and a right side cover 19 </ b> B connected to the light cover 18 are provided on the left side surface and the right side surface of the fuel tank 10.

  A crankshaft 20 is installed in the left and right direction in the cylinder block 2. 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.

  Further, a liner (not shown) is provided in the front-rear horizontal direction at the front portion 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.

  Further, 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.

<Radiator>
FIG. 3 is an exploded perspective view around the radiator. The radiator 9 includes a radiator core 90, 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 90 is accommodated in the radiator frame 92. In the radiator core 90, 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 disposed on the upper side of the radiator core 90 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. In addition, a replenishing port 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.

  The radiator frame 92 is erected on the upper surface of the cylinder block 2 and supports the radiator core 90 and the upper tank 91. A cooling air intake 921 for taking cooling air into the radiator core 90 is formed on the left surface of the radiator frame 92. The periphery of the front and rear portions and the upper portion of the cooling air inlet 921 is bent outward to form a flange portion 922 having left and right surfaces parallel to the front and rear direction. Two mounting holes 92a penetrating in the left-right direction are formed in the front and rear flanges 922, respectively. The cooling air inlet duct 12 is fixed to the mounting hole 92a with a bolt 121 and a nut.

  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 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 94 a and 94 b are formed at 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).

<Cooling air inlet duct>
4 is a left side view of the radiator frame 92, the cooling air inlet duct 12, and the cooling air inlet screen 15. FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG. 6 is a sectional view taken along line BB in FIG. 7 is a cross-sectional view taken along the line CC of FIG. In order to make the drawing easier to see, the air filter 154 is omitted in FIG.

  The cooling air inlet duct 12 is attached to the inlet side of the cooling air inlet 921. The cooling air inlet duct 12 is a member that guides the cooling air to the cooling air inlet 921. The cooling air inlet duct 12 includes a cylindrical portion 122, a flange portion 123, and a throttle portion 124. The cooling air inlet duct 12 is produced, for example, by drawing a sheet metal member.

  The cylindrical portion 122 is a cylindrical body having a substantially rectangular cross section extending in the left-right direction from the cooling air inlet 921 toward the cooling air inlet screen 15. Two concave portions 125 extending in the left-right direction are formed inside the front and rear portions of the cylindrical portion 122, respectively. The recess 125 serves as a passage for passing the bolt 121 when the cooling air inlet duct 12 is assembled. The recess 125 also serves as a cooling air flow path.

  The collar portion 123 is formed over the entire circumference at the left end portion, which is the end portion of the cylindrical portion 122 on the cooling air inlet screen 15 side. The collar portion 123 is bent outward from the left end portion of the cylindrical portion 122 and has left and right surfaces parallel to the front-rear direction. Attachment holes 12a penetrating in the left-right direction are respectively formed in the middle part in the up-down direction of the front and rear flanges 123. A cooling air inlet screen 15 is fixed to the mounting hole 12a with a knob bolt 151 and a nut. The attachment hole 12 a is an example of a screen attachment portion for attaching the cooling air inlet screen 15 to the flange portion 123. There is no limitation in particular in the form and position of a screen attachment part.

  Since the width of the flange 123 is determined by the substantially rectangular shape that is the outer shape of the flange 123 and the shape of the left end of the cylindrical portion 122 that is the inner shape of the flange 123, the width varies. In this embodiment, the width of the part which crosses the attachment hole 12a of the collar part 123 and its vicinity in the front-back direction is the widest.

  As shown in FIG. 3, the throttle portion 124 is formed over the entire circumference at the right end portion, which is the end portion of the cylindrical portion 122 on the cooling air inlet 921 side. The narrowing portion 124 is bent inward from the right end portion of the cylindrical portion 122 and has left and right surfaces parallel to the front-rear direction. The opening 126 on the outlet side of the cooling air inlet duct 12 formed by the throttle 124 is approximately the same size as the cooling air inlet 921.

  Attachment holes 12b penetrating in the left-right direction are formed in portions of the front and rear narrowing portions 124 that overlap with the recesses 125, respectively. Bolts 121 are inserted through the mounting holes 12 b, and the cooling air inlet duct 12 is fixed to the radiator frame 92. The attachment hole 12 b is an example of a duct attachment portion that attaches the cooling air inlet duct 12 to the cooling air intake 921. The position of the duct mounting portion is not particularly limited as long as it is inside the cylindrical portion 122, and the form thereof is not particularly limited.

  Thus, by arranging the bolt 121 inside the cooling air inlet duct 12, the concave portion 125 is provided, and the inside of the cylindrical portion 122 expands, so that the flow area of the cooling air can be expanded. Therefore, more cooling air can be taken in.

<Cooling air inlet screen>
A cooling air inlet screen 15 is attached to the inlet side of the cooling air inlet duct 12. The cooling air inlet screen 15 is a member that captures dust contained in the cooling air taken in. The cooling air inlet screen 15 includes an outer frame 152, a crosspiece 153, and an air filter 154.

  The outer frame 152 is a frame body that has a portion that protrudes to the left side that is opposite to the cylindrical portion 122 along the flange portion 123, and has a portion that contacts the outer edge of the left surface of the flange portion 123. The outer frame 152 includes a front contact portion 152a, a rear contact portion 152b, an upper contact portion 152c, and a lower contact portion 152d that contact the outer edge of the left surface of the flange portion 123, and leftward from the contact portions 152a to 152d. And a projecting portion 152e having an end portion bent inward. An opening 155 formed by the end of the protrusion 152 e serves as an inlet for the cooling air of the cooling air inlet screen 15. The opening 155 is larger than the opening area on the inlet side of the cylindrical portion 122.

  Mounting holes 152f penetrating in the left-right direction are formed in the front contact portion 152a and the rear contact portion 152b, respectively. A knob bolt 151 is inserted into the mounting hole 152f, and the cooling air inlet screen 15 is fixed to the cooling air inlet duct 12. The thickness of the protrusion 152e around the mounting hole 152f in the left-right direction is thinner than the other portions of the protrusion 152e. Thereby, when the knob bolt 151 is assembled, the protruding amount of the knob bolt 151 to the left is reduced, and the engine 1 can be downsized. The mounting hole 152 e is an example of a mounting portion for mounting the cooling air inlet screen 15 to the cooling air inlet duct 12. There is no limitation in particular in the form and position of an attachment part.

  The crosspiece 153 supports the air filter 154, and is formed in a honeycomb shape so as to cover the opening 155 inside the protruding portion 152e. The shape of the crosspiece 153 is not particularly limited, and may be a lattice shape or the like.

  The air filter 154 is a member that is disposed with a gap from the flange 123 so as to cover the opening 155. In this embodiment, the cooling air inlet screen 15 is produced by using a stainless mesh material as the air filter 154 and resin-molding the outer frame 152 with the air filter 154 inserted. Therefore, the air filter 154 is embedded between the crosspieces 153.

<Flow path of cooling air>
A flow path for taking cooling air into the radiator 9 will be described. First, the vertical width of the flow path will be described. As shown in FIG. 5, the vertical width W1 of the cooling air inlet 921 of the radiator frame 92, the vertical width W2 of the opening 126 on the outlet side of the cooling air inlet duct 12, and the cooling air inlet duct 12 The vertical width W3 of the opening on the inlet side, the vertical width W4 of the opening on the outlet side of the cooling air inlet screen 15, and the vertical width W5 of the opening 155 on the inlet side of the cooling air inlet screen 15 Are approximately the same length.

  As a result, because the cooling fan is operated, the air is sucked in with the width W1 in the vertical direction of the cooling air inlet 921, so that the width W1 is substantially the same in the vertical direction of the opening 155 on the inlet side of the cooling air inlet screen 15. Intake with a width W5. Therefore, dust is uniformly deposited on the entire width W5 of the opening 155 in the air filter 154 by taking in the cooling air.

  Next, the width in the front-rear direction of the flow path in the vicinity of the knob bolt 151 will be described. As shown in FIG. 6, the width W 6 in the front-rear direction of the cooling air inlet 921 of the radiator frame 92, the width W 7 in the front-rear direction of the opening 126 on the outlet side of the cooling air inlet duct 12, and the cooling air inlet duct 12 The width W8 in the front-rear direction of the opening on the inlet side is substantially the same length. The width W9 in the front-rear direction of the opening on the outlet side of the cooling air inlet screen 15 and the width W10 in the front-rear direction of the opening 155 on the inlet side of the cooling air inlet screen 15 are substantially the same length and width. Longer than W6 to W8.

  As a result, the cooling fan is operated to suck in the width W6 in the front-rear direction of the cooling air inlet 921, so that the width W6 shorter than the width W10 in the front-rear direction of the opening 155 on the inlet side of the cooling air inlet screen 15 is also obtained. Is inhaled. Therefore, by taking in the cooling air, dust is accumulated on the air filter 154 in a portion overlapping the width W6, and dust hardly accumulates on both sides of the portion overlapping the width W6. That is, almost no dust accumulates on the portion of the flange 123 visible in FIG.

  If the air filter 154 is neglected for a long period of time and the air filter 154 begins to become clogged with dust, the suction resistance of the clogged portion increases, so that the air filter 154 overlaps the unclogged width W6. Increased inhalation from both sides. As a result, even if the air filter 154 is clogged, the cooling air can be taken in from the clogged portions on both sides of the clogged portion, so that the amount of cooling air taken in is not extremely reduced. .

  Thus, by adopting a configuration in which dust does not easily accumulate in the vicinity of the edge of the air filter 154, even when dust accumulates to some extent on the air filter 154, the intake amount of cooling air is not extremely reduced, and the radiator 9 A decrease in cooling performance can be suppressed, and a decrease in output of the engine 1 can be suppressed.

  In the above configuration, in order to make it more difficult for dust to accumulate near the edge of the air filter 154, the front-rear direction along the flange 123 from the inner surface of the cylindrical portion 122 to the opening 155 of the outer frame 152 in the vicinity of the knob bolt 151. May be designed to be equal to or greater than the length W12 of the gap between the flange 123 and the air filter 154. This is because when the air filter 154 is not clogged by placing a larger air filter 154 close to the flange 123, the air filter 154 is hardly inhaled from the vicinity of the edge and starts to clog. This is because the cooling air can be taken in well from the vicinity of the edge of the air filter 154.

DESCRIPTION OF SYMBOLS 1 Engine 9 Radiator 12 Cooling air inlet duct 15 Cooling air inlet screen 122 Cylinder part 123 Gutter part 152 Outer frame 154 Air filter 155 Opening part 921 Cooling air inlet

Claims (4)

A radiator having a cooling air intake port for taking in cooling air;
A cooling air inlet duct that is provided on the inlet side of the cooling air inlet and guides the cooling air to the cooling air inlet;
A cooling air inlet screen provided on the inlet side of the cooling air inlet duct and capturing dust contained in the cooling air taken in;
The cooling air inlet duct has a cylindrical portion extending from the cooling air intake toward the cooling air inlet screen, and a flange provided at an end portion of the cylindrical portion on the cooling air inlet screen side,
The cooling air inlet screen is formed by an outer frame disposed so as to protrude on the opposite side of the cylindrical portion along the flange portion, and an end portion of the outer frame opposite to the cylindrical portion, An engine comprising: an opening larger than an opening area on the cooling air inlet screen side; and an air filter disposed with a gap and a gap so as to cover the opening.   2. The engine according to claim 1, wherein the cooling air inlet duct has a screen mounting portion for attaching the cooling air inlet screen to the flange portion.   3. The engine according to claim 1, wherein the cooling air inlet duct has a duct mounting portion that is attached to the cooling air inlet inside the cylindrical portion. 4.   The length in the direction along the flange from the inner surface of the cylindrical portion in the vicinity of the screen mounting portion to the end of the outer frame on the opening portion side is the length of the gap between the flange and the air filter. It is the above, The engine as described in any one of Claims 1-3 characterized by the above-mentioned.

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