JP2022143952A - engine - Google Patents

Abstract

To provide an engine which can inhibit a discharge pipe for discharging a blow-by gas from contacting with other components.SOLUTION: An engine 1 includes: an engine body 2; a head cover 5; a discharge pipe 40; and a fixing member 50. The engine body 2 includes a combustion chamber. The head cover 5 is disposed above the engine body 2. The discharge pipe 40 is connected to the head cover 5. The discharge pipe 40 discharges a blow-by gas, a gas leaking from the combustion chamber, into atmospheric air. The fixing member 50 fixes the discharge pipe 40 to the engine body 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to engines.

Conventionally, an engine is known in which blow-by gas, which is gas leaking from a combustion chamber, is returned to an intake pipe and sent to the combustion chamber again (see, for example, Patent Document 1). Patent Document 1 describes an engine in which an upstream end of a blow-by gas return pipe is connected to a blow-by gas outlet of a blow-by gas reducing device, and a downstream end of the blow-by gas return pipe is connected to an intake pipe.

JP 2017-198123 A

By the way, depending on the region where the engine is used, it is possible to discharge the blow-by gas into the atmosphere without returning it to the intake system. In this case, the upstream end of the blow-by gas discharge pipe for discharging blow-by gas is connected to the blow-by gas discharge port, while the downstream end of the blow-by gas discharge pipe is not connected to the intake system. That is, the blow-by gas discharge pipe is fixed only at the upstream end. Therefore, since the blow-by gas discharge pipe vibrates due to engine vibration, the blow-by gas discharge pipe may come into contact with other parts of the engine.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an engine capable of suppressing contact of a discharge pipe for discharging blow-by gas with other parts.

An engine according to one aspect of the present invention includes an engine body, a head cover, an exhaust pipe, and a fixing member. The engine body includes a combustion chamber. The head cover is arranged above the engine body. The discharge pipe is connected to the head cover. The discharge pipe discharges blow-by gas, which is gas leaked from the combustion chamber, into the atmosphere. The fixing member fixes the exhaust pipe to the engine body.

ADVANTAGE OF THE INVENTION According to this invention, the engine which can suppress that the exhaust pipe which exhausts blow-by gas contacts other components can be provided.

1 is a perspective view showing the structure of an engine according to one embodiment of the present invention; FIG. 1 is a perspective view showing a structure around a fixing member of an engine according to one embodiment of the present invention; FIG. 1 is an exploded perspective view showing a structure around an exhaust pipe of an engine according to one embodiment of the present invention; FIG. 1 is a perspective view showing a structure around an exhaust pipe and an exhaust manifold of an engine according to one embodiment of the present invention; FIG. FIG. 4 is an enlarged side view showing the structure around the downstream end of the discharge pipe of one embodiment of the present invention;

An embodiment of an engine according to the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. In this specification, the first direction X, the second direction Y, and the third direction Z that intersect with each other are appropriately described for easy understanding. The first direction X and the second direction Y are substantially parallel to the horizontal direction, and the third direction Z is substantially parallel to the vertical direction. Although the first direction X, the second direction Y and the third direction Z are orthogonal to each other in this specification, they do not have to be orthogonal. Hereinafter, one side X1 in the first direction X indicates the left side of the engine, and the other side X2 in the first direction X indicates the right side of the engine. One side Y1 in the second direction Y indicates the front side (front side) of the engine, and the other side Y2 in the second direction Y indicates the rear side (rear side) of the engine. One side Z1 in the third direction Z indicates the upper side, and the other side Z2 in the third direction Z indicates the lower side. However, the left-right direction, the front-rear direction, and the up-down direction are merely defined for convenience of explanation, and the directions during use and assembly of the engine according to the present invention are not limited.

An engine 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. FIG. 1 is a perspective view showing the structure of an engine 1 according to one embodiment of the invention. The engine 1 is mounted, for example, on working machines such as agricultural machines, construction machines, and civil engineering machines.

As shown in FIG. 1, the engine 1 includes an engine body 2, a head cover 5, an oil pan 6, a cooling fan 7, and a crankshaft 10. Engine body 2 includes a combustion chamber (not shown). Moreover, the engine body 2 further includes at least a cylinder block 3 .

A crankshaft 10 is arranged inside the cylinder block 3 . Crankshaft 10 is an output shaft. The crankshaft 10 is arranged along the front-rear direction. Both ends of the crankshaft 10 protrude from the cylinder block 3 to the outside.

The cylinder block 3 includes a right side (not shown), a left side 3a, and a mounting portion 3b. The mounting portions 3b are arranged on the front side portion and the rear side portion on each of the right side surface and the left side surface 3a of the cylinder block 3 . The mounting portion 3b is fixed to a chassis (not shown) of the working machine using a bolt via a vibration isolating member such as rubber. The left side surface 3a of the cylinder block 3 is an example of "one side surface of the cylinder block" of the present invention.

Engine 1 further comprises an intake manifold (not shown) and an exhaust manifold 11 . Moreover, the engine body 2 further includes a cylinder head 4 . The cylinder head 4 is arranged above the cylinder block 3 . An intake manifold is arranged on the right side (not shown) of the cylinder head 4 . The intake manifold supplies air to each cylinder (not shown) of the engine body 2 . The exhaust manifold 11 is arranged on the left side surface 4 a of the cylinder head 4 . The exhaust manifold 11 is connected to the cylinder head 4 . Exhaust gas is discharged from the cylinder head 4 to the exhaust manifold 11 .

The head cover 5 is arranged above the engine body 2 . That is, the head cover 5 is arranged above the cylinder head 4 .

The oil pan 6 is arranged below the engine body 2 . That is, the oil pan 6 is arranged below the cylinder block 3 . The oil pan 6 stores lubricating oil. Lubricating oil in the oil pan 6 returns to the oil pan 6 after being supplied to each part of the engine 1 .

The cooling fan 7 is arranged in front of the engine body 2 . The engine 1 further includes a belt 12 arranged in front of the engine body 2 . A rotational driving force is transmitted to the cooling fan 7 from the front end of the crankshaft 10 via the belt 12 .

The engine 1 further comprises a flywheel (not shown) and a flywheel housing 13 . The flywheel housing 13 is arranged behind the engine body 2 . The flywheel housing 13 accommodates the flywheel. A flywheel is attached to the rear end of the crankshaft 10 . The rotational driving force of the crankshaft 10 is transmitted to the operating portion of the work machine via the flywheel.

Continuing to refer to FIG. 1, the structure around the engine body 2 will be described. The engine 1 further includes a supercharger 20 , an intake pipe 23 , a supercharging pipe (not shown), and an exhaust communication pipe 25 . The supercharger 20 increases the pressure of air supplied to the engine body 2 . The supercharger 20 is arranged on the left side of the head cover 5 . Turbocharger 20 includes a compressor case 21 and a turbine case 22 . Compressor case 21 incorporates a blower wheel (not shown). Turbine case 22 incorporates a turbine wheel (not shown).

The intake pipe 23 is connected to the intake inlet of the compressor case 21 . The supercharging pipe is connected to the intake outlet of the compressor case 21 . Also, the supercharging pipe is connected to an intake manifold (not shown) via an EGR device (exhaust gas recirculation device) not shown.

The exhaust manifold 11 extends rearward from the front portion of the left side surface 4 a of the cylinder head 4 . The exhaust manifold 11 is connected to an exhaust inlet of the turbine case 22 . An exhaust communication pipe 25 is connected to an exhaust outlet of the turbine case 22 . The exhaust communication pipe 25 is connected to a tail pipe (not shown) via an exhaust gas purification device (not shown). Therefore, the exhaust gas discharged from each cylinder (not shown) of the engine body 2 to the exhaust manifold 11 passes through the turbine case 22 of the turbocharger 20, the exhaust communication pipe 25, the exhaust gas purification device, the tail pipe, and the like. It is discharged outside. Exhaust gas purifiers collect particulate matter and the like in exhaust gas.

The engine 1 further includes an EGR (Exhaust Gas Recirculation) cooler 30 , a cooling water outlet pipe 31 and an EGR pipe 33 . The exhaust manifold 11 extends to the rear end of the left side surface 4a of the cylinder head 4. As shown in FIG. A rear end portion 11 a of the exhaust manifold 11 is connected to the EGR cooler 30 . A portion of the exhaust gas within exhaust manifold 11 is sent to EGR cooler 30 . The coolant outlet pipe 31 is connected to the left side surface 3 a of the cylinder block 3 . Cooling water that has cooled the cylinder block 3 is discharged to the cooling water outlet pipe 31 . Also, the cooling water outlet pipe 31 is connected to the EGR cooler 30 . The exhaust gas inside the EGR cooler 30 is cooled by the coolant passing through the coolant outlet pipe 31 . EGR cooler 30 is connected to an EGR device (not shown) via EGR pipe 33 . The EGR device returns part of the exhaust gas to the intake system as EGR gas. Note that the exhaust manifold 11 and the EGR pipe 33 may be integrally molded.

In the engine 1, a part of the exhaust gas from the exhaust manifold 11 and the air in the intake pipe 23 are mixed, and then pass through the EGR device (not shown) and the intake manifold (not shown) to the engine body 2. supplied to each cylinder. A part of the exhaust gas is recirculated to each cylinder via an EGR device or the like, thereby lowering the combustion temperature in the engine 1 . Therefore, the amount of nitrogen oxides (NOx) discharged from the engine 1 is reduced, and the fuel efficiency of the engine 1 is improved.

Next, the exhaust pipe 40 of the engine 1 of this embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 2 is a perspective view showing the structure around the fixing member 50 of the engine 1 of this embodiment.

As shown in FIG. 1 , engine 1 further includes an exhaust pipe 40 . The discharge pipe 40 is connected to the head cover 5 . The exhaust pipe 40 is a pipe for discharging blow-by gas generated in the engine body 2 into the atmosphere. Blow-by gas is gas that escapes from the combustion chamber. Specifically, the head cover 5 includes a left side surface 5a and an outlet 5b arranged on the left side surface 5a. The discharge port 5 b discharges the blow-by gas to the outside of the head cover 5 . An upstream end 40a of the discharge pipe 40 is connected to the discharge port 5b. That is, the blow-by gas is discharged into the atmosphere from the discharge port 5b through the discharge pipe 40. As shown in FIG. The discharge pipe 40 extends downward along the left side surface of the engine body 2 from the discharge port 5b.

Engine 1 further includes a fixing member 50 . The fixing member 50 fixes the exhaust pipe 40 to the engine body 2 . Therefore, it is possible to secure a clearance between the exhaust pipe 40 and other parts of the engine 1 and to suppress the vibration of the exhaust pipe 40 due to the vibration of the engine 1 . As a result, it is possible to prevent the discharge pipe 40 from coming into contact with other parts of the engine 1 .

Specifically, the exhaust pipe 40 is fixed to the engine body 2 at least at one location other than the upstream end portion 40a. The fixing member 50 includes, but is not limited to, a holding metal plate 51 and a bolt 52 as shown in FIG. 2, for example. The holding sheet metal 51 includes a holding portion 51a that holds the discharge pipe 40 (see FIG. 1). The holding portion 51 a curves along the outer peripheral surface of the discharge pipe 40 . The discharge pipe 40 is fixed to the holding portion 51a by, for example, welding. The holding sheet metal 51 is fastened to the engine body 2 with bolts 52 .

In this embodiment, the engine 1 includes a plurality of fixing members 50, as shown in FIG. The discharge pipe 40 is fixed at a plurality of locations on the cylinder block 3 by a plurality of fixing members 50 . Therefore, compared to the case where the discharge pipe 40 is fixed to separate parts such as to be fixed to the cylinder head 4 and the cylinder block 3, the discharge pipe 40 may be deformed or the discharge pipe 40 may not be assembled due to assembly errors. You can prevent it from disappearing.

In this embodiment, for example, the engine 1 has two fixing members 50 . The discharge pipe 40 is fixed at two locations on the cylinder block 3 by two fixing members 50 . Specifically, the discharge pipe 40 is fixed to a portion of the cylinder block 3 on the oil pan 6 side by a fixing member 50 . A portion of the cylinder block 3 on the oil pan 6 side is a portion of the cylinder block 3 below the center in the vertical direction. Therefore, the downstream end 40b of the discharge pipe 40 or a portion close to the downstream end 40b can be fixed. That is, the discharge pipe 40 is fixed at a portion far from the upstream end portion 40a connected to the discharge port 5b. As a result, vibration of the exhaust pipe 40 due to vibration of the engine 1 can be effectively suppressed. In this embodiment, the downstream end portion 40b of the discharge pipe 40 is fixed to the lower end portion 3c of the left side surface 3a of the cylinder block 3 by the fixing member 50. As shown in FIG.

Further, the discharge pipe 40 is fixed by a fixing member 50 to a portion of the left side surface 3 a of the cylinder block 3 on the side of the exhaust manifold 11 . A portion of the cylinder block 3 on the side of the exhaust manifold 11 is a portion of the cylinder block 3 above the center in the vertical direction. A left side surface 3 a of the cylinder block 3 is arranged below the exhaust manifold 11 . Since the left side surface 3a of the cylinder block 3 is on the exhaust side, the temperature of the left side surface 3a of the cylinder block 3 tends to be high. The exhaust pipe 40 is arranged in a portion of the left side surface 3a on the side of the exhaust manifold 11 where the temperature is particularly high. Therefore, it is possible to prevent the moisture inside the discharge pipe 40 from freezing even in a low-temperature environment. In this embodiment, the discharge pipe 40 is fixed to the upper end portion 3d of the left side surface 3a of the cylinder block 3 by a fixing member 50. As shown in FIG. Further, the exhaust pipe 40 is fixed below the exhaust manifold 11 at the upper end portion 3d of the left side surface 3a.

Next, the structure of the discharge pipe 40 will be further described with reference to FIGS. 1 and 3 to 5. FIG. FIG. 3 is an exploded perspective view showing the structure around the exhaust pipe 40 of the engine 1 of this embodiment. FIG. 4 is a perspective view showing the structure around the exhaust pipe 40 and the exhaust manifold 11 of the engine 1 of this embodiment. FIG. 5 is an enlarged side view showing the structure around the downstream end 40b of the discharge pipe 40 of this embodiment.

The discharge pipe 40 is arranged so as to pass through the side of the exhaust manifold 11 from above downward. Therefore, compared with the case where the exhaust pipe 40 curves so as to pass through the front or rear of the exhaust manifold 11, it is possible to suppress the length of the exhaust pipe 40 from increasing. Furthermore, since heat is transferred from the exhaust manifold 11, which becomes particularly hot, to the exhaust pipe 40, freezing of moisture inside the exhaust pipe 40 can be further suppressed.

Specifically, as shown in FIG. 3, the discharge pipe 40 includes an upstream end portion 40a, a downstream end portion 40b, an attachment portion 40c, a detour portion 40d, a vertical portion 40e, an inclined portion 40f, and a vertical portion 40d. and part 40g.

Attachment portion 40c includes an upstream end portion 40a. As shown in FIG. 4, the mounting portion 40c is arranged above the exhaust manifold 11. As shown in FIG. The attachment portion 40 c is attached to the head cover 5 . The attachment portion 40 c is connected to the outlet 5 b of the head cover 5 . Moreover, the attachment portion 40c is connected to the detour portion 40d. The detour portion 40d is arranged so as to avoid the exhaust manifold 11. As shown in FIG. That is, the detour portion 40 d moves away from the left side surface 5 a of the head cover 5 , passes substantially vertically downward along the side of the exhaust manifold 11 , and then curves to approach the left side surface 3 a of the cylinder block 3 . In other words, the detour portion 40d is arranged to straddle the exhaust manifold 11 vertically. Also, the detour portion 40 d is arranged so as to pass between the exhaust manifold 11 and the intake pipe 23 . The detour portion 40d is connected to the vertical portion 40e. The vertical portion 40 e is arranged below the exhaust manifold 11 . The vertical portion 40 e extends vertically downward along the left side surface 3 a of the cylinder block 3 . The vertical portion 40e is connected to the inclined portion 40f (see FIG. 3).

As shown in FIG. 1, the inclined portion 40f (see FIG. 3) is arranged below the exhaust manifold 11. As shown in FIG. The inclined portion 40 f is arranged along the left side surface 3 a of the cylinder block 3 . The inclined portion 40f is inclined rearward and downward from the vertical portion 40e (see FIG. 3). That is, the inclined portion 40f extends downward while avoiding the attachment portion 3b. The inclined portion 40f is connected to the vertical portion 40g (see FIG. 3). The vertical portion 40g includes a downstream end portion 40b (see FIG. 3). The vertical portion 40g extends vertically downward along the left side surface 3a of the cylinder block 3 . As shown in FIG. 5, the vertical portion 40g extends below the cylinder block 3. As shown in FIG.

Subsequently, the structure of the discharge pipe 40 will be further described with reference to FIGS. 3 and 5. FIG. As shown in FIG. 3 , the exhaust pipe 40 includes an elastic elastic pipe 41 connected to the head cover 5 and a metal pipe 42 connected to the elastic pipe 41 . By including the metal pipe 42 in the exhaust pipe 40 , the metal pipe 42 can be brought closer to the engine body 2 . As a result, the flexibility of the piping layout of the discharge pipe 40 can be improved. Furthermore, by connecting the head cover 5 and the metal tube 42 with the elastic tube 41, transmission of vibration from the head cover 5 to the metal tube 42 can be suppressed.

Specifically, the elastic tube 41 has heat resistance. Although the material of the elastic tube 41 is not particularly limited, the elastic tube 41 is made of acrylic rubber, for example. The elastic tube 41 corresponds to the mounting portion 40c. The elastic tube 41 is connected to the outlet 5 b of the head cover 5 . The elastic tube 41 is fixed to the outlet 5b using a fastener 45. As shown in FIG. Elastic tube 41 is connected to metal tube 42 . Elastic tube 41 is secured to metal tube 42 using fasteners 46 .

The metal pipe 42 corresponds to the detour portion 40d, the vertical portion 40e, the inclined portion 40f and the vertical portion 40g. The metal tube 42 is made of metal. The metal tube 42 is composed of a single member. That is, the detour portion 40d, the vertical portion 40e, the inclined portion 40f, and the vertical portion 40g are composed of a single member.

At least a portion of the exhaust pipe 40 (a detour portion 40d) disposed on the side of the exhaust manifold 11 is made of metal. Therefore, deterioration of the exhaust pipe 40 due to heat from the exhaust manifold 11 can be suppressed.

The metal tube 42 has a bulging portion (also referred to as a bulge portion) 42b having a larger diameter than the rest of the metal tube 42 at the upstream end portion 42a. The elastic tube 41 is connected so as to cover the bulging portion 42b of the metal tube 42 . Also, the metal tube 42 has a bulging portion 42d having a larger diameter than the other portions of the metal tube 42 at the downstream end portion 42c. Therefore, a rubber hose, for example, can be connected to the downstream end 42c of the metal pipe 42. As shown in FIG. Therefore, the blow-by gas discharge position can be appropriately changed according to the structure of the working machine in which the engine 1 is mounted. The downstream end portion 42c is an example of the "lower end portion" of the present invention.

A downstream end 42 c of the metal pipe 42 corresponds to the downstream end 40 b of the discharge pipe 40 . As shown in FIG. 5, the bulging portion 42d is arranged below the cylinder block 3. As shown in FIG.

Moreover, in this embodiment, the engine 1 further includes a pipe 43 . The tube 43 has elasticity, for example. The tube 43 is made of, for example, a rubber hose. The tube 43 may not have heat resistance. Tube 43 is connected to downstream end 42 c of metal tube 42 . The tube 43 is connected so as to cover the bulging portion 42d of the metal tube 42 . Tube 43 is secured to metal tube 42 using fasteners 47 .

A lower end 43a of the tube 43 has an inclined surface 43b. The inclined surface 43b is inclined with respect to the direction in which the pipe 43 extends. Therefore, the cross-sectional area of the discharge port (not shown) of the pipe 43 becomes larger than when the lower surface of the pipe 43 is formed perpendicular to the extending direction of the pipe 43 . Since the moisture inside the pipe 43 freezes from the edge of the discharge port, it is possible to suppress the blockage of the discharge port of the pipe 43 by ice generated by freezing. Moreover, the water inside the pipe 43 flows downward along the inclined surface 43b. Therefore, it is difficult for water to accumulate in the upper portion of the discharge port of the pipe 43 . Therefore, blocking of the outlet of the pipe 43 with ice caused by freezing can be further suppressed.

Also, the tube 43 is detachable from the metal tube 42 . For example, when changing the blow-by gas discharge position in accordance with the structure of the working machine, the pipe 43 is appropriately changed to another rubber hose.

The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist of the present invention. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be omitted from all components shown in the embodiments. Furthermore, components across different embodiments may be combined as appropriate. In order to make the drawings easier to understand, the drawings mainly show each component schematically. may be different. In addition, the material, shape, dimensions, etc. of each component shown in the above embodiment are examples and are not particularly limited, and various changes are possible without substantially departing from the effects of the present invention. be.

For example, in the above-described embodiment, the fixing member 50 is used to fix the discharge pipe 40 to two locations on the cylinder block 3, but the present invention is not limited to this. For example, the fixing member 50 may be used to fix the discharge pipe 40 to one or more than three positions of the cylinder block 3 .

Further, in the above-described embodiment, an example in which the exhaust pipe 40 is arranged on the exhaust side (left side) of the cylinder block 3 has been described, but the present invention is not limited to this. For example, the exhaust pipe 40 may be arranged on the intake side (right side) of the cylinder block 3 .

Further, in the above-described embodiment, an example in which the discharge pipe 40 is fixed to the cylinder block 3 has been shown, but the present invention is not limited to this. For example, the discharge pipe 40 may be fixed to the cylinder head 4 .

The present invention is useful in the field of engines.

1: Engine 2: Engine body 3: Cylinder block 3a: Left side (one side)
4: Cylinder head 5: Head cover 6: Oil pan 11: Exhaust manifold 40: Exhaust pipe 40d: Detour portion (portion arranged on the side of the exhaust manifold)
41: Elastic tube 42: Metal tube 42c: Downstream end (lower end)
42d: swelling portion 50: fixing member

Claims (8)

an engine body including a combustion chamber;
a head cover arranged above the engine body;
a discharge pipe connected to the head cover for discharging blow-by gas, which is gas leaked from the combustion chamber, into the atmosphere;
and a fixing member that fixes the exhaust pipe to the engine body. A plurality of the fixing members are provided,
The engine body further includes at least a cylinder block,
2. The engine according to claim 1, wherein said exhaust pipe is fixed at a plurality of locations of said cylinder block by said plurality of fixing members. further comprising an oil pan arranged below the cylinder block,
3. The engine according to claim 2, wherein the discharge pipe is fixed to a portion of the cylinder block on the oil pan side by the fixing member. Equipped with an exhaust manifold,
The engine body further includes a cylinder head arranged above the cylinder block,
The exhaust manifold is connected to the cylinder head,
The cylinder block has one side surface arranged below the exhaust manifold,
4. The engine according to claim 2, wherein the exhaust pipe is fixed to a portion of the one side surface of the cylinder block on the exhaust manifold side by the fixing member. 5. The engine according to claim 4, wherein the exhaust pipe is arranged to pass through the side of the exhaust manifold from top to bottom. 6. The engine according to claim 5, wherein at least a portion of said exhaust pipe disposed laterally of said exhaust manifold is made of metal. The engine according to any one of claims 1 to 6, wherein the exhaust pipe includes an elastic pipe connected to the head cover and having elasticity, and a metal pipe connected to the elastic pipe. 8. The engine of claim 7, wherein said metal tube has a bulge at its lower end that has a larger diameter than the rest of said metal tube.

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