CN109219691B

CN109219691B - Engine device

Info

Publication number: CN109219691B
Application number: CN201780033534.6A
Authority: CN
Inventors: 石桥孝夫
Original assignee: Isuzu Motors Ltd
Current assignee: Isuzu Motors Ltd
Priority date: 2016-06-03
Filing date: 2017-06-02
Publication date: 2021-01-29
Anticipated expiration: 2037-06-02
Also published as: MY191644A; WO2017209278A1; JP6707997B2; JP2017218906A; CN109219691A; PH12018502517A1

Abstract

The engine device includes: blow-by gas pipes (32, 33) through which blow-by gas generated by the engine (10) flows; a recirculated exhaust gas pipe (21) which connects an exhaust system (18) and an intake system (17) of the engine (10) and through which recirculated exhaust gas flows; and a 1 st cooler (22) that is inserted into the recirculated exhaust gas pipe (21), is provided at a vehicle body rear side portion of the engine (10), and cools the recirculated exhaust gas. At least a part of the blow-by gas pipes (32, 33) is disposed adjacent to the 1 st cooler (22).

Description

Engine device

Technical Field

The present disclosure relates to an engine device, and more particularly, to a PCV (Positive Crankcase Ventilation) device that discharges blow-by gas generated by an engine to the atmosphere or returns it to an intake system.

Background

Conventionally, PCV devices have been put into practical use, which discharge blow-by gas, which leaks into a crankcase from a clearance between a cylinder and a piston, to the atmosphere or return the blow-by gas to an intake system.

In a low-temperature environment such as a cold district, after the blow-by gas pipe is cooled by outside air, moisture contained in the blow-by gas freezes to become ice, and collides with a turbocharger or the like, thereby damaging parts or the like in some cases. Further, if the blowby gas pipe is clogged due to freezing, a failure such as oil leakage may occur due to an increase in the pressure in the crankcase, and it is necessary to effectively suppress freezing of the blowby gas.

For example, patent document 1 discloses a technique for preventing blowby gas from freezing by causing engine cooling water to flow through a heat-retaining pipe covering a blowby gas pipe to exchange heat.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese laid-open patent publication No. H07-166835

Disclosure of Invention

[ problems to be solved by the invention ]

In addition, as the vehicle travels, traveling wind may be injected into the engine compartment from the front. Therefore, the front and side surfaces of the engine are exposed to the traveling wind and are liable to be lowered in temperature, and if the blow-by gas pipe or the oil separator is disposed in such a place, the freezing of the blow-by gas may not be sufficiently prevented merely by heat exchange with the engine cooling water.

The disclosed technology aims to effectively suppress a drop in blow-by gas temperature due to the influence of traveling wind.

[ means for solving the problems ]

The disclosed technique is characterized by comprising: a blow-by gas pipe through which blow-by gas generated by the engine flows; a recirculated exhaust gas pipe which connects an exhaust system and an intake system of the engine and through which recirculated exhaust gas flows; and a 1 st cooler that is inserted into the recirculated exhaust gas pipe, is provided at a vehicle body rear side portion of the engine, and cools recirculated exhaust gas, wherein at least a part of the blowby gas pipe is disposed adjacent to the 1 st cooler.

Further, the blow-by gas pipe may further include an oil separator inserted into the blow-by gas pipe to separate oil from blow-by gas, and the oil separator may be disposed adjacent to the 1 st cooler.

Further, the exhaust gas treatment apparatus may further include a 2 nd cooler that is inserted into the recirculated exhaust gas pipe on the downstream side of the 1 st cooler and is disposed above the 1 st cooler so as to face the recirculated exhaust gas pipe with a predetermined interval therebetween, and that cools the recirculated exhaust gas, wherein the oil separator is disposed between the 1 st cooler and the 2 nd cooler.

Further, the oil separator may be fixed to at least one of the 1 st cooler and the 2 nd cooler via a bracket.

Further, one end side of the holder may be fixed to a housing of at least one of the 1 st cooler and the 2 nd cooler.

The 1 st cooler and the 2 nd cooler may be provided at a vehicle body rear side portion of the engine so as to extend in a vehicle body width direction.

[ Effect of the invention ]

According to the technique of the present disclosure, a drop in the temperature of the blow-by gas due to the influence of the traveling wind can be effectively suppressed.

Drawings

Fig. 1 is a schematic view showing an engine device according to an embodiment of the present disclosure as viewed from the rear of a vehicle body.

Fig. 2 is a schematic perspective view illustrating an engine device according to an embodiment of the present disclosure.

Fig. 3 is a schematic perspective view showing an engine device according to another embodiment.

Fig. 4 is a schematic view showing an engine device according to another embodiment as viewed from the rear of the vehicle body.

Detailed Description

Next, an engine device according to an embodiment of the present disclosure will be described with reference to the drawings. The same components are denoted by the same reference numerals, and their names and functions are also the same. Therefore, a detailed description thereof will not be repeated.

Fig. 1 is a schematic view of a diesel engine (hereinafter, simply referred to as an engine) 10 according to the present embodiment as viewed from the rear of a vehicle body. A cylinder head 12 is provided at an upper portion of the cylinder block 11, and a head cover 13 is provided at an upper portion of the cylinder head 12. A crankcase portion 11A that accommodates a crankshaft 14 is provided in the cylinder block 11, and a flywheel 15 is provided at a rear end portion of the crankshaft 14. An oil pan 16 for storing oil is provided in a lower portion of the cylinder block 11.

An intake manifold 17A and an exhaust manifold 18A are provided on the side portions of the cylinder head 12. An intake pipe 17 for introducing fresh air into the combustion chamber is connected to the intake manifold 17A, and an exhaust pipe 18 for discharging exhaust gas from the combustion chamber is connected to the exhaust manifold 18A.

The Exhaust Gas Recirculation (EGR) device 20 includes: an EGR pipe 21 that connects the exhaust pipe 18 and the intake pipe 17 to allow EGR gas to flow therethrough; a front stage EGR cooler 22 that is inserted into the EGR pipe 21 and cools the EGR gas; a rear stage EGR cooler 23 that is inserted into the EGR pipe 21 at a position downstream of the front stage EGR cooler 22 and cools the EGR gas; and an EGR valve 24 capable of adjusting the EGR gas amount.

The PCV device 30 includes: an oil separator 31 that separates oil from blow-by gas; a 1 st blow-by gas pipe 32 connecting a blow-by gas outlet portion of the cylinder head 13 and a blow-by gas inlet portion of the oil separator 31; a 2 nd blowby gas pipe 33 having one end side connected to the blowby gas outlet of the oil separator 31 and discharging the blowby gas to the atmosphere (or returning the blowby gas to the intake pipe 17); and a return pipe 34 that connects the oil outlet portion of the oil separator 31 and the oil inlet portion of the cylinder block 11 and returns the oil separated by the oil separator 31 to the oil pan 16.

Next, the arrangement relationship between the ERG device 20 and the PCV device 30 according to the present embodiment will be described in detail with reference to fig. 2.

As shown in fig. 2, the front-stage EGR cooler 22 is disposed on a vehicle-body rear side portion of the engine 10 (for example, a rear surface of the cylinder block 11 or the cylinder head 12) such that a cylindrical housing 22A accommodating a pipe (not shown) has a cylindrical axis direction substantially aligned with a vehicle-body width direction. The rear EGR cooler 23 is disposed at a vehicle body rear side portion (for example, the back surface of the cylinder head 12 or the cylinder head cover 13) of the engine 10 located above the front EGR cooler 22 at a predetermined interval from the front EGR cooler 22 so that the cylinder axis direction of the square tubular housing 23A accommodating a pipe (not shown) becomes substantially the vehicle body width direction.

That is, the front-stage EGR cooler 22 and the rear-stage EGR cooler 23 are arranged side by side in the vehicle width direction on the vehicle body rear side portion of the engine 10 such that the upper surface of the housing 22A of the front-stage EGR cooler 22 and the lower surface of the housing 23A of the rear-stage EGR cooler 23 face each other with a space therebetween.

The oil separator 31 is disposed between the front-stage EGR cooler 22 and the rear-stage EGR cooler 23, and adjacent to the

housings

22A and 23A. More specifically, the housing 22A of the front-stage EGR cooler is provided with the 1 st bracket 40 formed by bending a heat conductive material such as a metal material into a substantially L shape. The oil separator 31 is fixed to the 1 st bracket 40 by a bolt or the like not shown.

That is, by disposing the oil separator 31 at the vehicle body rear side portion of the engine 10 surrounded by the front-stage EGR cooler 22 and the rear-stage EGR cooler 23, it is possible to effectively prevent the oil separator 31 from being directly exposed to the traveling wind flowing into the engine compartment. Further, by providing the 1 st bracket 40 on the housing 22A of the pre-stage EGR cooler 22 that becomes high in temperature and fixing the oil separator 31 to the 1 st bracket 40, the heat of the oil separator 31 can be retained by the heat conducted from the housing 22A through the 1 st bracket 40.

The connection end sides of the 1 st blow-by pipe 32 and the 2 nd blow-by pipe 33 to the oil separator 31 are disposed between the front-stage EGR cooler 22 and the rear-stage EGR cooler 23. Further, the 1 st blow-by gas pipe 32 and the 2 nd blow-by gas pipe 33 are fixed to the EGR pipe 21 connecting the front-stage EGR cooler 22 and the rear-stage EGR cooler 23 via the 2 nd bracket 41.

That is, by disposing a part of the 1 st blow-by gas pipe 32 and the 2 nd blow-by gas pipe 33 at the vehicle body rear side portion of the engine 10 surrounded by the preceding-stage EGR cooler 22 and the subsequent-stage EGR cooler 23, it is possible to effectively prevent these

pipes

32, 33 from being directly exposed to the traveling wind flowing into the engine compartment. Further, by providing the 2 nd bracket 41 to the EGR pipe 21 that becomes a high temperature and fixing the 1 st blow-by pipe 32 and the 2 nd blow-by pipe 33 to the 2 nd bracket 41, it is possible to keep the

pipes

32, 33 warm by heat conducted from the EGR pipe 21 through the 2 nd bracket 41.

As described above in detail, according to the present embodiment, the oil separator 31 is disposed at the vehicle body rear side portion of the engine 10 surrounded by the front-stage EGR cooler 22 and the rear-stage EGR cooler 23, so that the traveling wind flowing into the engine compartment can be effectively prevented from directly blowing on the oil separator 31, and the temperature drop of the oil separator 31 can be suppressed.

Further, by disposing a part of the 1 st blowby pipe 32 and the 2 nd blowby pipe 33 at the vehicle body rear side portion of the engine 10 surrounded by the front-stage EGR cooler 22 and the rear-stage EGR cooler 23, it is possible to effectively prevent the blowby gas flowing in these

pipes

32, 33 from being cooled by the influence of the traveling wind.

Further, by fixing the oil separator 31 to the 1 st bracket 40 provided on the housing 22A of the pre-stage EGR cooler 22, heat is conducted from the housing 22A to the oil separator 31 via the 1 st bracket 40, and heat insulation of the oil separator 31 can be effectively achieved.

Further, by fixing the 1 st blow-by pipe 32 and the 2 nd blow-by pipe 33 to the 2 nd bracket 41 provided to the EGR pipe 21, heat is conducted from the EGR pipe 21 to these

pipes

32, 33 via the 2 nd bracket 41, and heat insulation of these

pipes

32, 33 can be effectively achieved.

The present invention is not limited to the above embodiments, and can be implemented by being appropriately modified within a range not departing from the gist of the present invention.

For example, as shown in fig. 3, the oil separator 31 may be fixed to both the housing 22A of the front-stage EGR cooler 22 and the housing 23A of the rear-stage EGR cooler 23 via the substantially U-shaped 3 rd bracket 42. In this case, heat is conducted from the

housings

22A, 23A to the oil separator 31 via the 3 rd bracket 42, and heat insulation of the oil separator 31 can be achieved more effectively.

The EGR cooler of the EGR apparatus 20 is not limited to a plurality of stages, and may include a single-stage EGR cooler 25 as shown in fig. 4. In this case, the oil separator 31 may be disposed adjacent to and below the EGR cooler 25.

The engine 10 is not limited to a diesel engine, and can be widely applied to other engines such as a gasoline engine.

The present application is based on Japanese patent application 2016 (2016-111741), filed on 3/6/2016, the contents of which are incorporated herein by reference.

[ Industrial availability ]

According to the technique of the present disclosure, it is useful to effectively suppress a drop in the temperature of the blow-by gas due to the influence of the traveling wind.

[ description of reference numerals ]

10 Engine

11 cylinder block

12 cylinder head

13 cylinder head cover

14 crankshaft

15 flywheel

16 oil pan

17 air inlet pipe

18 exhaust pipe

20 EGR device

21 EGR piping

22 preceding stage EGR cooler

23 rear stage EGR cooler

30 PCV device

31 machine oil separator

32 st 1 blow-by gas piping

33 nd 2 nd blow-by gas piping

40 st rack

41 nd 2 support

Claims

1. An engine apparatus, comprising:

a blow-by gas pipe through which blow-by gas generated by the engine flows,

a recirculated exhaust gas pipe which connects an exhaust system and an intake system of the engine and circulates recirculated exhaust gas,

a 1 st cooler that is inserted into the recirculated exhaust gas pipe, is provided at a vehicle body rear side portion of the engine, and cools recirculated exhaust gas, and

a 2 nd cooler that is inserted into the recirculated exhaust gas pipe on a downstream side of the 1 st cooler, and is disposed above the 1 st cooler so as to face the first cooler with a predetermined interval therebetween, and cools recirculated exhaust gas;

at least a part of the blow-by gas pipe is disposed between the 1 st cooler and the 2 nd cooler.

2. An engine apparatus, comprising:

a blow-by gas pipe through which blow-by gas generated by the engine flows,

a 1 st cooler inserted into the recirculated exhaust gas pipe, provided at a vehicle body rear side portion of the engine, and cooling recirculated exhaust gas,

a 2 nd cooler that is inserted into the recirculated exhaust gas pipe on a downstream side of the 1 st cooler and is disposed above the 1 st cooler so as to face the 1 st cooler with a predetermined interval therebetween, and cools recirculated exhaust gas, an

An oil separator inserted into the blow-by gas pipe and separating oil from the blow-by gas, the oil separator being disposed adjacent to the 1 st cooler;

the oil separator is disposed between the 1 st cooler and the 2 nd cooler.

3. The engine apparatus of claim 2,

the oil separator is fixed to at least one of the 1 st cooler and the 2 nd cooler via a bracket.

4. The engine apparatus of claim 3,

one end side of the bracket is fixed to a housing of at least one of the 1 st cooler and the 2 nd cooler.

5. The engine apparatus of any of claims 2 to 4,

the 1 st cooler and the 2 nd cooler are provided at a vehicle body rear side portion of the engine so as to extend in a vehicle body width direction.