JPH09209852A - Intake-device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve atomization performance of fuel and enhance idle performance by forming a hot water passage in a part of an intake system to which an idle regulating valve is attached, and communicating this hot water passage with the cooling system of an engine. SOLUTION: Bypass passages 111, 122 are formed between a connecting intake pipe 110 and a throttle body 120 attached thereto, and also an idle adjusting valve 140 is arranged therebetween. An idle passage 141 arranged to the idle regulating valve 140 is communicated with the bypass passages 111, 122, and an intake air amount is adjusted by the regulating valve element 142 of the idle passage 141 during an idling period when a throttle is fully closed. In this case, grooves 112, 123 are formed to a joint opening of the connecting intake pipe 110 and the throttle body 120, and a how water passage 150 is formed in a part of an intake system by mutually connecting these grooves 112, 123. Hot water is introduced from an engine side cooling system to a hot water introducing opening, and discharged from a hot water discharging opening 124 through a hot water discharging pipe 125.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an engine provided with an idle adjustment valve in an intake system.

[0002]

2. Description of the Related Art For example, an engine mounted on a vehicle includes an idle adjusting valve in an intake system, which adjusts an intake air amount when the throttle is fully closed to improve idle performance.

As described above, in the case where the idle adjusting valve is provided, a spacer provided with a hot water passage is inserted, or the idle adjusting valve is warmed by a heater or the like to make intake air at a predetermined temperature and improve atomization of fuel. .

[0004]

By the way, it is not easy to secure a space for inserting the spacer in the case of inserting the spacer having the hot water passage. Further, it is expensive to heat the idle adjusting valve with a heater or the like. Moreover,
It is necessary to add an electronic control device to control the heater and the like.

As described above, in the intake system, the surge tank and the throttle body are connected to the downstream side of the idle adjusting valve. The structure is such that they can be easily attached and detached during maintenance of these and vehicle parts, and the intake efficiency is improved. There is a demand for a structure that improves

The present invention has been made in view of the above points, and improves idle performance by setting a predetermined intake temperature.
Further, it is an object of the present invention to provide an intake device for an engine that is easy to maintain and improves intake efficiency.

[0007]

In order to solve the above-mentioned problems and to achieve the object, the invention according to claim 1 is an intake system for an engine having an idle adjusting valve in an intake system. A feature is that a hot water passage is formed in a part of the attached intake system, and the hot water passage is communicated with a cooling system of the engine. By forming a hot water passage in a part of the intake system to which the idle adjusting valve is attached and flowing hot water that has cooled the engine, a predetermined intake temperature can be achieved, fuel atomization is good, and idle performance is improved.
In addition, the hot water passage is formed by using part of the intake system, so there is no need for a spacer that has a conventional hot water passage or a heater to warm the idle adjustment valve, so it is easy to secure a space for installation and is inexpensive. Is.

According to another aspect of the engine intake system of the present invention, the throttle body provided with the idle adjustment valve is
It is characterized in that it is attached to a surge tank on the downstream side via a separable connection intake pipe. For example, during maintenance of vehicle parts such as the spark plug, the surge tank located at the upper part is integrally removed, so that the vehicle parts such as the spark plug can be easily attached and detached. Further, the throttle body remains on the engine side, foreign matter can be prevented from entering the cylinder head, and removal of vehicle parts such as the throttle link becomes unnecessary.

An intake system for an engine according to a third aspect of the present invention is characterized in that the intake system inlet of the evaporation purge gas is opposed to the air flow in the intake system. By making the intake system inlet of the evaporative purge gas face the air flow, the evaporative purge gas is uniformly mixed with the intake air, and the variation in A / F among a plurality of cylinders is reduced and the intake performance is improved.

An intake system for an engine according to a fourth aspect of the present invention is characterized in that the intake system inlet for EGR gas is opposed to the air flow in the intake system. By making the intake system inlet of EGR gas face the air flow,
The gas is uniformly mixed with the intake air, the variation in the EGR rate between the plurality of cylinders is reduced, and the intake performance is improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an engine intake system of the present invention will be described below with reference to the drawings. 1 is a side view of a multi-cylinder engine provided with an intake device, FIG. 2 is a plan view of a multi-cylinder engine provided with an intake device, and FIG. 3 is III-III of FIG.
4 is a sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along the line VV of FIG. 3, FIG. 6 is a plan view showing a mounting portion of the surge tank and the idle adjusting valve, and FIG. 7 is FIG.
Right side view, FIG. 8 is a cross-sectional view of the idle adjusting valve, FIG. 9 is a front view of the surge tank, FIG. 10 is a plan view of the surge tank,
11 is a right side view of FIG. 10, FIG. 12 is a sectional view taken along line XII-XII of FIG. 9, FIG. 13 is a sectional view taken along line XIII-XIII of FIG. 9, and FIG. 14 is a line XIV-XIV of FIG. FIG.

A multi-cylinder engine 1 equipped with an intake device has eight
It is a cylinder V-type engine and uses a double overhead camshaft type. The engine 1 has a crankcase 2, an oil pan 3 at the bottom of the crankcase 2, and a cylinder block 4 at the top.
The cylinder block 4 has a set of cylinder banks 5 and 6 that branch at an angle. The cylinder banks 5 and 6 of each cylinder have four cylinders 5a,
6a are formed. In the figure, the cylinder 5a of the cylinder cylinder 5 of the left cylinder and the cylinder 6a of the cylinder bank 6 of the right cylinder are arranged at an angle, and in the illustrated embodiment, this angle is approximately 60 degrees. .

A V-type engine, such as engine 1, has a central valley between which is formed by cylinder banks 5 and 6 branching outward.
The inner side surface of each cylinder bank 5 or cylinder bank 6 is the side surface adjacent to the valley, while the outer side surface is the side surface not facing the valley. However,
Certain aspects listed herein are also useful for engines having other arrangements and engines having other numbers of cylinders in each cylinder bank than the 60 degree angle between the cylinder banks.

The engine 1 is generally arranged in an engine compartment 7 of a vehicle and below an inclined engine hood 8 with a crankshaft 9 transverse to the longitudinal axis of the vehicle. The radiator 10 is located at the front end of the vehicle to which the engine 1 is attached.

The cylinders 5a. 6a
11 is connected to the crankshaft 9 via a connecting rod 12, and the crankshaft 9 is connected to the piston 11.
Is rotated by. A flywheel 13 is fixed to one end of the crankshaft 9, and a drive pulley 14 is fixed to the other end.

The crankshaft 9 is rotatably supported in the crankcase 2 arranged below the cylinder block 4. The belt 15 extends around the drive pulley 14 and around a plurality of coplanar engine system drive pulleys. In particular, the belt 15 drives the air condition compressor or the drive pulley 17 of the power steering pump 16, the drive pulley 19 of the fuel pump 18, and the drive pulley 21 of the AC generator 20. In addition, a plurality of idle pulleys 22 are disposed between the drive pulleys of the aforementioned device to maintain belt 15 tension and belt 15 desired path tension.

The right cylinder head 26 is mounted above the right cylinder bank 6, while the left cylinder head 24 is mounted above the left cylinder bank 5. Each cylinder bank 5 and 6 comprises a respective row of cylinders 5a and 6a in which a piston 11 is supported for reciprocating movement. Each cylinder head 24 and cylinder head 26
Has a hollow cavity 25 formed facing each cylinder 5a, 6a. The cylinders 5 a and 6 a, the piston 11 and the recess cavity 25 form a combustion chamber 27 of the engine 1.

A set of intake valves 30 and a set of exhaust valves 31 are located in each recess cavity 25 to control the flow of combustion gases to and from the combustion chamber 27. An exhaust passage 32 is formed in each cylinder head 24 or cylinder head 26, and the exhaust passage 32 extends from an opening to the combustion chamber 27 and communicates with each exhaust pipe 33. The exhaust valve 31 is used for the cylinder head
And the cylinder heads 26 are mutually supported to control communication between the exhaust passage 32 and the combustion chamber 27. Each exhaust valve 31 is operated in any suitable way, for example by an exhaust camshaft 35 mounted above via a thimble tappet 34. There are usually two exhaust valves 31 in one cylinder, but the number can be varied. The opening of the exhaust passage 32 to the combustion chamber 27 is located on the outer side surface of the combustion chamber 27.
A pair of intake passages 41 communicating with the intake device 40 are formed in each of the cylinder heads 24 and 26 on the inner side surface of the combustion chamber 27 passing through 1. Exhaust passage 32
The intake passage 41 is selectively opened and closed by the intake valve 30 and extends to the combustion chamber 27 in the same manner as.
The intake valve 30 is supported by each of the cylinder head 24 and the cylinder head 26, and controls communication between the intake passage 41 and the combustion chamber 27. Each intake valve 30 may be installed in any suitable manner, i.e., overhead mounted intake camshaft 42.
Operated by The intake camshaft 42 moves the intake valve 30 in a known manner, for example via a thimble tappet 43.

There are four valves and two camshafts per cylinder bank 5 and cylinder bank 6. The intake camshaft 42 is arranged on the inner side surface of the cylinder heads 24 and 26 adjacent to the valley between the cylinder banks 4 and 6, while the exhaust camshaft 35 is arranged outside the cylinder heads 24 and 26. Placed on the side of.

This engine 1 incorporates an intake device 40, but the intake device 40 allows a compact engine layout,
It also makes it possible to adjust two different intake passages 41 in each cylinder for different engine speed ranges. The intake device 40 includes a fuel injection device 54 in a single surge tank 50 mounted on a cylinder head cover 44 on the cylinder head 24, intake pipes 51, 52 generally formed by a plurality of runners, and a control body 53. Including a fuel injection system having. The central position of the intake device 40 and the fuel injection system is the intake passage 41.
Therefore, the intake cam shaft 42 is located inside and the exhaust cam shaft 35 is located outside. Fuel passage 5
5 supplies the fuel to the fuel injection device 54.

The engine 1 utilizes an eccentric balance shaft 60, such as a shaft, to balance the disproportionate pressure created by the crankshaft 9, piston 11 and associated components. The balance shaft 60 is rotatably supported in a valley between the cylinder banks 5 and 6 of the engine 1. Balance axis 6
0 is rotatably supported by a set of bearings 61 provided in the cylinder block 4. The balance shaft 60 extends into a space 62 in front of the front bearing 61, in which space the drive sprocket 6 is
3 is attached. The drive sprocket 63 is connected to the drive sprocket 69 of the crankshaft 9 by a deflection transmitter 64 such as a timing chain,
The balance shaft 60 is driven at the same speed as the crank shaft 9 and in the opposite direction. The central portion of the balance shaft 61 rotates in the space 65 in the valley of the cylinder block 4 between the crankcase 2 and the intake device 40.

The blow-by gas coming out of the cylinder can circulate through the crankcase 2 and pass through the balance shaft 60. The oil separator 66 is the cylinder bank 5
It is arranged below the intake device 40 in the valley between the cylinder bank 6 and the cylinder bank 6. The oil separator 66 is supplied with gas by a new arrangement for recovering vaporized hydrocarbons generated by ventilating the crankcase 2, and the oil can be separated inside the oil separator 66.

The lower wall 66a of the oil separator 66 causes all the oil condensed therein to flow back to the space 65 of the balance shaft 60 through the opening 66b, and from the space 65 to the crankcase 2 to the upper wall 67. To flow back through the opening (not shown). The ventilation gas of the crankcase 2 is
It is again guided to the combustion chamber 27 via a conduit 68 extending from the rear of the oil separator 66. The space 65 of the balance shaft 60 thus communicates with the intake device 40. The released vaporized hydrocarbons can be recycled and reburned in the intake system 40 through space 65 and conduit 68.

The valve train drive assembly includes a flex transmitter 64, which not only drives the balance shaft 60, but also a set of camshafts 35, 42 in each cylinder bank 5 and cylinder bank 6.
Among them, one cam shaft is driven by the cam shaft driving device. The camshaft drive device includes a drive sprocket 69 rotatably mounted on the crankshaft 9, and a deflection transmitter 6
It includes a set of driven sprockets 70 fixed to the front ends of two of the four or four cam shafts and a drive sprocket 63 of the balance shaft 60.

Single surge tank 50 of intake system 40
Is arranged above the cylinder on the rear side of the vehicle, and the surge tank 5
0 has an inlet opening 50a at the upstream end, and the inlet opening 50a
Intake air from a. This single surge tank 50
As shown in FIG. 3, the cross section has a triangular cross section, and one side facing the seating surface is arranged along the cylinder head cover 44 of the cylinder. Thus, the single surge tank 50 has a substantially triangular cross-sectional shape, and one side surface is arranged along the cylinder head cover 44 of the cylinder on the rear side of the vehicle, thereby suppressing the engine width and height. However, the capacity of the surge tank 50 can be secured, and satisfactory intake performance can be obtained.

The surge tank 50 is provided with a first air horn 80 and a second air horn 81 which are connected to intake pipes 51 and 52 for sucking air into the cylinders of the respective cylinders. The first air horn 80 and the second air horn 81 are of a divided structure. The divided first air horn 80 and second air horn 81 are separately attached to a single surge tank 50.

The intake pipes 51 and 52 connected to the cylinder bank 5 and the cylinder bank 6 are divided into two parts, a surge tank side and a cylinder side, and mounting parts 51a1 and 51a2 are provided on both sides of the surge tank side intake pipe 51a. On both sides of the surge tank side intake pipe 52a.
52a2 is formed, and mounting portions 51b1 and 51b2 are provided on both sides of the cylinder side intake pipe 51b.
Mounting portions 51b1 and 52b2 are formed on both sides of b and 52b.

The mounting portion 51a2 and the mounting portion 51b1 of the surge tank side intake pipe 51a and the cylinder side intake pipe 51b are connected by a rubber band which is an elastic member 91. Similarly, the surge tank side intake pipe 52a and the cylinder side intake pipe 52b are connected by a rubber band having an elastic member 93 at the mounting portion 52a2 and the mounting portion 52b1.

The intake pipes 51 and 52 are attached by first attaching the intake pipe 52 at the lower position and then attaching the intake pipe 51 at the upper position. As for the intake pipe 52, the mounting portion 52b2 of the cylinder side intake pipe 52b is screwed to the control body 53 to attach the mounting portion 52a of the surge tank side intake pipe 52a.
No. 1 is fixed to the second air horn 81 by screwing a bolt (not shown) to the surge tank 50.

For the intake pipe 51, the mounting portion 51b2 of the cylinder side intake pipe 51b is screwed to the control body 53,
The mounting portion 51a1 of the surge tank side intake pipe 51a is the first
A bolt (not shown) which is applied to the air horn 80 is screwed to the surge tank 50 and is fixed by tightening.

As described above, the control body 53 is attached to the downstream side of the surge tank 50 via the divided intake pipes 51 and 52. That is, each intake pipe 5
1, 52 are separately mounted on the surge tank side and the cylinder head side, and the respective mounting portions are elastic members 91, 9
When the spark plugs provided in the cylinders are inspected or replaced by connecting them with 3, the surge tank sides 51a, 52a of the intake pipes 51, 52 can be removed from the elastic members 91, 93, and the entire intake system can be removed. There is no need to remove it, the work is simple and can be performed in a short time, and the attachment and detachment of vehicle parts such as the spark plug is facilitated. Further, since the control body 53 remains on the engine side, it is possible to prevent foreign matter from entering the cylinder head 26, and it becomes unnecessary to remove vehicle parts such as the throttle link.

A throttle body 120 is attached to the inlet opening 50a at the upstream end of the surge tank 50 via a connecting intake pipe 110.
Is equipped with a throttle valve 121. On the upstream side of the throttle body 120, the heat insulating pipe 1 made of rubber
The air cleaner 102 is connected via 01. The connection intake pipe 110 is connected to the inlet opening 50 of the surge tank 50.
It is connected to a by a rubber member 130, and this connecting portion is insulated by the rubber member 130. In this way, by insulating part of the intake system, it is possible to achieve a predetermined intake temperature, good atomization of fuel, and improved idle performance.

Connecting intake pipe 110 and throttle body 12
0 is joined and integrated, and the bypass passages 111 and 12 are provided between the connection intake pipe 110 and the throttle body 120.
2 are formed. An idle adjusting valve 140 is arranged between the connecting intake pipe 110 and the throttle body 120, and an idle passage 141 provided in the idle adjusting valve 140 is provided.
Communicate with the bypass passages 111 and 122, and an adjusting valve body 142 is arranged in the idle passage 141. The adjusting valve body 142 adjusts the intake air amount at the time of idling when the throttle is fully closed to improve the idle performance. Improve. In this way, by insulating part of the intake system to which the idle adjusting valve 140 is attached, it is possible to achieve a predetermined intake temperature, good atomization of fuel, and improved idle performance.

Connected intake pipe 110 and throttle body 12
Grooves 112 and 123 are formed in the joint opening 0, respectively, and the joint of the grooves 112 and 123 forms the hot water passage 150 in a part of the intake system. The connection intake pipe 110 is provided with a hot water inlet port 113, and the hot water inlet port 113 is connected to a hot water inlet pipe 114 for guiding hot water from a cooling system 180 formed of a water jacket or the like on the engine side. Also, the throttle body 120 has
A hot water outlet section 124 is provided, and the hot water outlet section 12 is provided.
4, a hot water discharge pipe 125 for returning hot water to the engine side cooling system 180 is connected. As described above, the hot water passage 150 is provided in a part of the intake system to which the idle adjusting valve 140 is attached.
By forming hot water which has cooled the engine, the intake air temperature can be set to a predetermined value, the atomization of the fuel is good, and the idle performance is improved. Further, since the hot water passage 150 is formed by utilizing a part of the intake system, a spacer provided with the conventional hot water passage, a heater for warming the idle adjusting valve, etc. are unnecessary, and it is easy to secure a space for arrangement and It is cheap.

Further, since the throttle body 120 having the idle adjusting valve 140 is attached to the surge tank 50 on the downstream side via the separable connection intake pipe 110, for example, at the time of maintenance of vehicle parts such as a spark plug,
By integrally removing the surge tank 50 located at the upper part from the connection intake pipe 110, it is easy to attach and detach vehicle parts such as a spark plug. Further, the throttle body 120 remains on the engine side, foreign matter can be prevented from entering the cylinder head 26, and removal of vehicle parts such as the throttle link becomes unnecessary.

Further, the inlet opening 50 of the surge tank 50
As shown in FIGS. 2, 9 and 14, an intake system inlet 160a of the evaporative purge gas introducing section 160 is formed at a, and the evaporative purge gas pipe 161 is formed in the evaporative purge gas introducing section 160. It is connected. The evaporation purge gas pipe 161 is connected to the fuel tank 18
1, the evaporative purge gas generated in the fuel tank 181 is guided to the evaporative purge gas introducing section 160, and the evaporative purge gas is supplied from the intake system inlet 160a of the evaporative purge gas introducing section 160 so as to face the air flow. In this way, by making the intake system inlet 160a of the evaporative purge gas face the flow of air, the evaporative purge gas is uniformly mixed with the intake air, and the A / F between a plurality of cylinders is increased.
Variation is reduced and intake performance is improved.

Further, the inlet opening 50 of the surge tank 50
As shown in FIG. 2, FIG. 9, FIG. 10, FIG. 12, and FIG. 13, the intake system inlet 170a of the EGR gas introduction part 170 is formed in a so as to face the intake upstream side. An EGR gas pipe 171 is connected to.
The EGR gas pipe 171 is connected to the EGR 182,
The EGR gas generated in the exhaust system is guided to the EGR gas introducing section 170, and the EGR gas is supplied from the intake system inlet 170a of the EGR gas introducing section 170 so as to face the air flow.
In this way, by making the intake system inlet 170a of EGR gas face the air flow, the EGR gas is uniformly mixed with the intake air, and the variation of the EGR rate among a plurality of cylinders is reduced to improve the intake performance. To be done.

[0038]

As described above, according to the first aspect of the invention, since the hot water passage is formed in a part of the intake system to which the idle adjusting valve is attached, the hot water for cooling the engine is made to flow to a predetermined intake temperature. The fuel atomization is good and the idle performance is improved. Further, since the hot water passage is formed by using a part of the intake system, a spacer provided with the conventional hot water passage and a heater for warming the idle adjusting valve are not required, and it is easy to secure a space for arrangement and inexpensive. is there.

According to the second aspect of the present invention, since the throttle body having the idle adjusting valve is attached to the surge tank on the downstream side via the separable connection intake pipe, for example,
During maintenance of the vehicle parts such as the spark plug, the surge tank located at the upper part is integrally removed, so that the vehicle parts such as the spark plug can be easily attached and detached. Further, the throttle body remains on the engine side, foreign matter can be prevented from entering the cylinder head, and removal of vehicle parts such as the throttle link becomes unnecessary.

According to the third aspect of the present invention, since the intake system inlet of the evaporative purge gas is opposed to the air flow, the evaporative purge gas is uniformly mixed with the intake air, and the variation in A / F among a plurality of cylinders is reduced. The intake performance is improved.

According to the fourth aspect of the invention, since the intake system inlet of the EGR gas is opposed to the air flow, the EGR gas is uniformly mixed with the intake air, and the variation in the EGR rate among a plurality of cylinders is reduced. The intake performance is improved.

[Brief description of drawings]

FIG. 1 is a side view of a multi-cylinder engine including an intake device.

FIG. 2 is a plan view of a multi-cylinder engine including an intake device.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a plan view showing a mounting portion of a surge tank and an idle adjusting valve.

FIG. 7 is a right side view of FIG.

FIG. 8 is a cross-sectional view of an idle adjustment valve.

FIG. 9 is a front view of a surge tank.

FIG. 10 is a plan view of a surge tank.

FIG. 11 is a right side view of FIG.

12 is a sectional view taken along line XII-XII in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

14 is a sectional view taken along line XIV-XIV in FIG.

[Explanation of symbols]

 1 Engine 110 Connection Intake Pipe 120 Throttle Body 140 Idle Adjustment Valve 150 Hot Water Passage 180 Cooling System

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location F02M 35/10 311 F02D 33/00 318J

Claims (4)

[Claims] 1. An intake system for an engine having an idle adjusting valve in an intake system, wherein a hot water passage is formed in a part of the intake system to which the idle adjusting valve is attached, and the hot water passage is communicated with a cooling system of the engine. An engine intake device characterized by the above. 2. The intake system for an engine according to claim 2, wherein the throttle body provided with the idle adjusting valve is attached to a surge tank on the downstream side via a separable connection intake pipe. 3. The engine intake system according to claim 1, wherein an intake system inlet of the evaporation purge gas is opposed to the air flow in the intake system. 4. The intake system for an engine according to claim 1, wherein an intake system inlet of EGR gas is opposed to a flow of air in the intake system.