CN111472868B - Internal combustion engine for vehicle - Google Patents

Internal combustion engine for vehicle Download PDF

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Publication number
CN111472868B
CN111472868B CN202010052871.3A CN202010052871A CN111472868B CN 111472868 B CN111472868 B CN 111472868B CN 202010052871 A CN202010052871 A CN 202010052871A CN 111472868 B CN111472868 B CN 111472868B
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China
Prior art keywords
cylinder head
engine
catalyst
cover
main body
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CN202010052871.3A
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Chinese (zh)
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CN111472868A (en
Inventor
金井拓也
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Suzuki Motor Corp
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Suzuki Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/02—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the distance of the apparatus to the engine, or the distance between two exhaust treating apparatuses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/04—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of an exhaust pipe, manifold or apparatus in relation to vehicle frame or particular vehicle parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/04—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using kinetic energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Supercharger (AREA)
  • Exhaust Silencers (AREA)

Abstract

Provided is a vehicle internal combustion engine capable of protecting components disposed in the upper part of the engine from the hot air flowing out of a catalyst housing cover. The engine (4) is provided with a catalyst housing cover (40), and the catalyst housing cover (40) is formed into a shape that is open to the engine main body (4A) side and covers the catalyst housing (25) from the side opposite to the engine main body (4A). The upper end of the catalyst housing cover (40) is disposed on the side of the cylinder head cover (13), and a plate-shaped heat shield plate (41) extending in the vertical direction is disposed between the catalyst housing cover (40) and the engine body (4A). The upper end (41a) of the heat shield plate (41) protrudes upward beyond the upper end of the catalyst housing cover (40).

Description

Internal combustion engine for vehicle
Technical Field
The present invention relates to an internal combustion engine for a vehicle.
Background
Conventionally, as an internal combustion engine mounted on a vehicle, an internal combustion engine described in patent document 1 is known. In the internal combustion engine described in patent document 1, an exhaust manifold having 1 exhaust outlet is integrated with a cylinder head, a turbine of a supercharger and an exhaust purification device are connected to the exhaust outlet, and the turbine is disposed above the exhaust manifold and the exhaust purification device.
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent publication No. 2014-163291
Disclosure of Invention
Problems to be solved by the invention
However, in the internal combustion engine described in patent document 1, when the turbine is disposed above the exhaust manifold, there is a possibility that: the turbine or the exhaust gas purification device, which is at a high temperature, is close to a seal portion between the cylinder head and the cylinder head cover or an engine auxiliary device disposed above the cylinder head cover, and these portions or auxiliary devices are exposed to high heat. In addition, in the case where the catalyst housing of the exhaust gas purification apparatus is covered from the side opposite to the engine main body by the catalyst housing cover formed in a shape in which the engine main body side is opened, the hot gas in the catalyst housing cover easily flows to the auxiliary device side.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicle internal combustion engine capable of protecting components disposed in an upper portion of the engine from hot gas flowing out of a catalyst case cover.
Means for solving the problems
The internal combustion engine for a vehicle of the present invention includes: a cylinder head disposed above the engine body; a cylinder head cover joined to an upper side of the cylinder head by a seal surface; a collective exhaust outlet that is open on one side surface of the cylinder head; a turbocharger having an exhaust passage portion extending upward of the collective exhaust outlet; a catalyst case extending downward from the exhaust passage portion along a side surface of the engine main body; and a catalyst case cover that is formed in a shape that is open toward the engine body side and covers the catalyst case from a side opposite to the engine body, wherein an upper end portion of the catalyst case cover is disposed on a side of the cylinder head cover, a plate-shaped heat shield plate that extends in a vertical direction is disposed between the catalyst case cover and the engine body, and an upper end of the heat shield plate protrudes upward beyond an upper end of the catalyst case cover.
Effects of the invention
Thus, according to the present invention, the components disposed in the upper portion of the engine can be protected from the hot gas flowing out of the catalyst housing cover.
Drawings
Fig. 1 is a front view of a vehicular internal combustion engine according to an embodiment of the present invention.
Fig. 2 is a front view showing a state in which a turbocharger, an exhaust gas purification device, and an air cleaner are removed, in a vehicle internal combustion engine according to an embodiment of the present invention.
Fig. 3 is a right side view of the vehicle internal combustion engine according to the embodiment of the present invention, with an air cleaner hose removed.
Fig. 4 is a left side view of a vehicle internal combustion engine according to an embodiment of the present invention, with an air cleaner hose removed.
Fig. 5 is a plan view showing a state in which an air cleaner is removed in the vehicle internal combustion engine according to the embodiment of the present invention.
Description of the reference numerals
4: engine (internal combustion engine for vehicle), 4A: engine main body, 4B: sealing surface, 12: cylinder head, 12A: flange portion, 13: cylinder head cover, 17: collective exhaust outlet, 21: turbocharger, 22A: exhaust passage portion, 25: catalyst housing, 40: catalyst housing cover, 40B: opening, 41: heat shield plate, 41A: body portion, 41B: upper end portion, 41C: lower extension, 41 a: and (4) the upper end.
Detailed Description
An internal combustion engine for a vehicle according to an embodiment of the present invention includes: a cylinder head disposed above the engine body; a cylinder head cover joined to an upper side of the cylinder head by a seal face; a collective exhaust outlet that opens to one side surface of the cylinder head; a turbocharger having an exhaust passage portion extending upward of the collective exhaust outlet; a catalyst case extending downward from the exhaust passage portion along a side surface of the engine main body; and a catalyst case cover that is formed in a shape that is open toward the engine body side and covers the catalyst case from the side opposite to the engine body, wherein an upper end portion of the catalyst case cover is disposed on the side of the cylinder head cover, a plate-shaped heat shield plate that extends in the vertical direction is disposed between the catalyst case cover and the engine body, and an upper end of the heat shield plate protrudes upward beyond an upper end of the catalyst case cover. Thus, the vehicle internal combustion engine according to the embodiment of the present invention can protect the components disposed in the upper portion of the engine from the hot air flowing out of the catalyst housing cover.
[ examples ]
Hereinafter, a vehicular internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 to 5 are views showing a vehicle internal combustion engine according to an embodiment of the present invention. In fig. 1 to 5, the vertical, front, rear, and left and right directions are the vertical, front, rear, and left and right directions of the vehicle internal combustion engine in a state of being installed in the vehicle, the direction orthogonal to the front and rear directions is the left and right directions, and the height direction of the vehicle internal combustion engine is the vertical direction.
First, the configuration is explained. In fig. 1, an engine 4 as a vehicle internal combustion engine includes an engine main body 4A and auxiliary devices described later. The engine body 4A includes a cylinder block 11, a cylinder head 12, a head cover 13, and an oil pan 14 for storing lubricating oil.
A plurality of cylinders, not shown, are provided in the cylinder block 11. The engine 4 of the present embodiment is constituted by a 4-cylinder engine having 4 cylinders, but is not limited to a 4-cylinder engine.
A piston, not shown, is housed in the cylinder, and the piston reciprocates in the vertical direction with respect to the cylinder. The piston is coupled to the crankshaft 11S (see fig. 4) by a connecting rod (not shown), and the reciprocating motion of the piston is converted into rotational motion of the crankshaft 11S by the connecting rod.
In fig. 1, 3, the chain case 7 is fastened to a right end portion of the cylinder block 11 in the cylinder row direction.
Here, the bank direction of the engine 4 is the left-right direction, i.e., the vehicle width direction. Therefore, the engine 4 is disposed in a so-called lateral arrangement in a vehicle not shown.
In fig. 1, the cylinder head 12 is provided with a plurality of intake ports, a plurality of intake valves that open and close the intake ports, a plurality of exhaust valves that open and close the exhaust ports, and the like, all of which are not shown.
An intake manifold, not shown, is provided on the rear surface of the cylinder head 12, and introduces intake air into the cylinder through an intake port.
An exhaust manifold 16 (see fig. 2) is formed inside the cylinder head 12.
The exhaust manifold 16 has a plurality of exhaust ports (not shown) communicating with the cylinders, and collects exhaust gas discharged from the cylinders (also referred to as exhaust gas or exhaust gas). That is, an exhaust manifold 16 integrated with an exhaust port is formed inside the cylinder head 12. Fig. 2 shows a collected portion of the exhaust manifold 16.
In fig. 2, the exhaust manifold 16 has a collective exhaust outlet 17. The collective exhaust gas outlet 17 is open in the front surface 12a of the cylinder head 12 in the center portion in the cylinder row direction.
The exhaust gas discharged from the cylinders is collected by the exhaust manifold 16, and then discharged to the outside of the cylinder head 12 through the collected exhaust gas outlet 17.
Around the collective exhaust outlet 17, a flange portion 12A forming a mounting surface on which the turbocharger 21 is mounted is provided on the front surface 12A of the cylinder head 12.
In fig. 1, a turbocharger 21 is provided on the front surface 11a side of the cylinder block 11, and includes a turbine housing 22 and a compressor housing 23. The turbine housing 22 includes an exhaust passage portion 22A, and the exhaust passage portion 22A is fastened and assembled to the flange portion 12A. The exhaust gas is introduced from the collective exhaust outlet 17 to the exhaust passage portion 22A. The exhaust passage portion 22A extends upward of the collective exhaust outlet 17.
The turbine housing 22 is provided with a turbine wheel, not shown, which is rotatably driven by exhaust gas introduced from the collective exhaust outlet 17 into the turbine housing 22 through the exhaust passage portion 22A.
The compressor housing 23 is provided with an intake air introduction portion 23A and an intake air discharge portion 23B. The intake air introduction portion 23A is connected to an air cleaner 28 via a turbine inlet pipe and an air cleaner hose 23C, and the intake air discharge portion 23B is connected to an intake manifold via an intercooler, not shown.
The compressor housing 23 is provided with a compressor impeller, not shown, which is rotatable, and the compressor impeller and the turbine impeller rotate integrally.
In the turbocharger 21, when the turbine wheel is rotated by the exhaust gas flow, the compressor wheel is rotated at high speed integrally with the turbine wheel. When the compressor impeller rotates, air purified by the air cleaner 28 is introduced into the compressor casing 23 through the air cleaner hose 23C and the turbine inlet pipe. The air introduced into the compressor housing 23 is supercharged and introduced into the intake manifold through an intercooler, not shown.
The turbine housing 22 is provided with an exhaust gas discharge portion, not shown, to which an exhaust gas purification device 24 disposed on the right side thereof is connected.
In fig. 2, the exhaust gas purification device 24 has a catalyst case 25. The catalyst case 25 extends downward from the exhaust passage portion 22A along the side surface of the engine main body 4A. The catalyst housing 25 includes: a main body portion 25C; an upstream pipe portion 25A provided on the upstream side of the body portion 25C; and a downstream pipe portion 25B provided downstream of the main body portion 25C. The upstream pipe portion 25A connects the turbine housing 22 and the body portion 25C of the turbocharger 21. Here, upstream and downstream refer to upstream and downstream with respect to the flow direction of the exhaust gas.
A three-way catalyst and a particulate filter, not shown, are housed in the main body portion 25C of the catalyst case 25. The three-way catalyst simultaneously performs purification treatment of HC, CO, and NOx contained in exhaust gas by oxidation-reduction reaction.
The particulate filter is disposed downstream of the three-way catalyst, and traps PM (particulate matter) that is particulate matter in the exhaust gas, such as graphite, combustion ash (SOF: combustible organic component) of fuel, and combustion ash (putty) of engine oil.
The upstream end of the upstream pipe portion 25A is open on the turbine housing 22 side of the turbocharger 21, and is connected to the turbine housing 22. Thus, the exhaust gas discharged from the collective exhaust gas outlet 17 to the turbine casing 22 is introduced from the turbine casing 22 to the main body 25C through the upstream pipe portion 25A, and is purified by the three-way catalyst and the particulate filter while passing through the inside of the main body 25C.
The downstream pipe portion 25B is connected to an exhaust pipe, not shown, and the exhaust gas flowing in the main body portion 25C of the catalyst case 25 is discharged from the downstream pipe portion 25B to the outside through the exhaust pipe. A head cover 13 hermetically joined by a seal surface 4B is disposed above the cylinder head 12. The collective exhaust outlet 17 opens at one side surface (front side surface) of the cylinder head 12. A gasket or a liquid gasket, not shown, is provided on the sealing surface 4B.
In fig. 1, the engine 4 includes a catalyst case cover 40, and the catalyst case cover 40 is formed in a shape that is open to the engine main body 4A side and covers the catalyst case 25 from the side opposite to the engine main body 4A. The upper end portion of the catalyst housing cover 40 is disposed on the side of the cylinder head cover 13.
In fig. 1, 3, and 4, a plate-shaped heat shield plate 41 extending in the vertical direction is disposed between the catalyst housing cover 40 and the engine main body 4A. The upper end 41a of the heat shield plate 41 protrudes upward beyond the upper end of the catalyst housing cover 40. In fig. 4, the heat shield plate 41 is supported by the cylinder head 12 and the cylinder head cover 13.
In fig. 2, the cylinder head 12 has a flange portion 12A, the flange portion 12A protrudes from a front surface 12A, which is one side surface of the cylinder head 12, and a collective exhaust outlet 17 is formed in the flange portion 12A. The catalyst case 25 (see fig. 1) is disposed on the side of the flange portion 12A.
The heat shield plate 41 has: a main body portion 41A extending from the upper side of the flange portion 12A toward the rear side of the catalyst case 25 (see fig. 1); and a lower extension portion 41C extending downward from the main body portion 41A along the rear side of the catalyst case 25.
In fig. 1, the catalyst housing cover 40 has an opening 40B through which outside air is introduced.
The opening 40B is disposed in front of the heat shield plate 41 of the catalyst case cover 40. Specifically, the opening 40B is disposed in front of the lower extension 41C of the heat shield plate 41.
In fig. 1, an air cleaner 28 is provided above the head cover 13 and in the vicinity of the turbocharger 21. A plate-shaped heat shield plate 41 extending in the vertical direction is provided above the collective exhaust outlet 17 and between the turbocharger 21 and the engine body 4A. The heat shield plate 41 extends upward beyond the bottom of the air cleaner 28, passing by the side of the sealing surface 4B joining the cylinder head 12 and the head cover 13.
In fig. 3 and 4, the upper end portion 41B of the heat shield plate 41 is curved and extends in a direction away from the engine main body 4A. Here, the upper end portion 41B of the heat shield plate 41 refers to a portion including the upper end 41a of the heat shield plate 41 and the vicinity thereof.
In fig. 1, the air cleaner 28 includes: an upper air cleaner case 28A; a lower air cleaner case 28B disposed on a lower surface of the upper air cleaner case 28A; and an air cleaner case seal portion 28C that joins the upper air cleaner case 28A and the lower air cleaner case 28B. The upper end 41a of the heat shield plate 41 extends above the air cleaner case seal portion 28C.
A gasket, not shown, is provided in the air cleaner case seal portion 28C, and the upper air cleaner case 28A and the lower air cleaner case 28B are air-tightly joined by the gasket.
In fig. 5, a plurality of ignition coils 43 are provided on the upper surface of the head cover 13. In fig. 4, the cylinder head cover 13 has a bulging portion 13B bulging upward beyond the upper end of the ignition coil 43 in fig. 5 between the ignition coil 43 and the turbocharger 21. The heat shield plate 41 is fitted to the front surface 12a and the bulging portion 13B of the cylinder head 12 by fasteners.
The ignition coil 43 is connected to a wire harness 44, and the wire harness 44 extends in a direction opposite to the heat shield plate 41 with respect to the ignition coil 43. That is, the heat shield plate 41 is disposed in front of the engine body 4A when viewed from the ignition coil 43, and the wire harness 44 extends rearward of the engine body 4A.
In fig. 4 and 5, the heat shield plate 41 is supported by the bulging portion 13B via an L-shaped bracket 42.
As described above, according to the engine 4 of the present embodiment, the engine 4 includes the catalyst case cover 40, and the catalyst case cover 40 is formed in a shape that is open to the engine main body 4A side and covers the catalyst case 25 from the side opposite to the engine main body 4A.
The upper end portion of the catalyst housing cover 40 is disposed on the side of the cylinder head cover 13, and a plate-shaped heat shield plate 41 extending in the vertical direction is disposed between the catalyst housing cover 40 and the engine body 4A. The upper end 41a of the heat shield plate 41 projects upward from the upper end of the catalyst housing cover 40.
This prevents the hot air in the catalyst housing cover 40 from flowing toward the component disposed above the seal surface 4B or the cylinder head cover 13 by the heat shield plate 41, and protects the components such as the seal member used for the seal surface 4B and the ignition coil 43 disposed above the cylinder head cover 13 from the hot air.
As a result, the components arranged in the upper portion of the engine 4 can be protected from the hot gas flowing out of the catalyst housing cover 40.
In addition, according to the engine 4 of the present embodiment, the heat shield plate 41 is supported by the cylinder head 12 and the cylinder head cover 13.
Accordingly, the heat shield plate 41 can not only extend the upper end 41a of the heat shield plate 41 to the side of the cylinder head cover 13 to expand the heat shield range, but also suppress the vibration of the heat shield plate 41.
In the engine 4 of the present embodiment, the cylinder head 12 has a flange portion 12A that protrudes from one side surface of the cylinder head 12 and opens to form the collective exhaust outlet 17, and the catalyst case 25 is disposed on the side of the flange portion 12A.
The heat shield plate 41 also includes: a main body portion 41A extending from the upper side of the flange portion 12A toward the rear side of the catalyst case 25; and a lower extension portion 41C extending downward from the main body portion 41A along the rear side of the catalyst case 25.
Thus, the heat shield plate 41 has: a main body portion 41A extending toward the rear side of the catalyst case 25; since the lower extension portion 41C extends downward from the main body portion 41A along the rear side of the catalyst case 25, the inlet portion of the catalyst case 25 having a temperature higher than that of the other portions can be covered with the main body portion 41A and the lower extension portion 41C of the heat shield plate 41, and the hot air in the catalyst case 25 can be prevented from flowing to the upper portion of the engine main body 4A.
In the engine 4 of the present embodiment, the catalyst housing cover 40 has the opening 40B for introducing the outside air, and the opening 40B is disposed in front of the heat shield plate 41 of the catalyst housing cover 40.
This allows the outside air to be introduced from the opening 40B into the catalyst housing cover 40, thereby cooling the upstream portion of the catalyst housing 25. Further, the heat shield plate 41 can prevent the outside air having cooled the catalyst case 25 from flowing to the upper portion of the engine.
Although embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included within the scope of the appended claims.

Claims (3)

1. An internal combustion engine for a vehicle, comprising:
a cylinder head disposed above the engine body;
a cylinder head cover joined to an upper side of the cylinder head by a seal surface;
an exhaust manifold disposed inside the cylinder head;
a collective exhaust outlet of the exhaust manifold, which is open on one side surface of the cylinder head;
a flange portion that protrudes from the one side surface of the cylinder head, and that opens in the flange portion to form the collective exhaust outlet;
a turbocharger having an exhaust passage portion extending upward of the collective exhaust outlet;
a catalyst case extending downward from the exhaust passage portion along a side surface of the engine main body; and
a catalyst case cover formed in a shape that is open to the engine main body side and covering the catalyst case from a side opposite to the engine main body,
the internal combustion engine for a vehicle described above is characterized in that,
the catalyst case is disposed on the side of the flange portion,
the upper end portion of the catalyst housing cover is disposed on the side of the cylinder head cover,
a plate-like heat shield plate extending in the vertical direction is disposed between the catalyst housing cover and the engine main body,
the upper end of the heat shield plate protrudes upward from the upper end of the catalyst case cover,
the heat shield plate comprises: a main body portion extending from an upper side of the flange portion to a rear side of the catalyst case; and a lower extension portion extending downward from the main body portion along the rear side of the catalyst case.
2. The vehicular internal combustion engine according to claim 1,
the heat shield plate is supported by the cylinder head and the cylinder head cover.
3. The vehicular internal combustion engine according to claim 1,
the catalyst housing cover has an opening for introducing outside air,
the opening is disposed in front of the heat shield plate of the catalyst case cover.
CN202010052871.3A 2019-01-23 2020-01-17 Internal combustion engine for vehicle Active CN111472868B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-009557 2019-01-23
JP2019009557A JP7206945B2 (en) 2019-01-23 2019-01-23 internal combustion engine for vehicle

Publications (2)

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CN111472868A CN111472868A (en) 2020-07-31
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KR20030041230A (en) * 2001-11-19 2003-05-27 기아자동차주식회사 Joint shaft heat sink structure
JP2010065564A (en) * 2008-09-09 2010-03-25 Kobe Steel Ltd Heat ray shielding cover
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