JP2668295B2 - Intake temperature reduction structure of engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reducing the intake air temperature of an engine intake system, and more particularly, to a radiator fan for discharging outside air introduced through an intake opening into an engine room of an automobile.
An intake air temperature reduction structure for an engine intake system that is supplied to an air cleaner through an intake duct provided with a silencer located near the shroud .

[0002]

2. Description of the Related Art In an engine room of an automobile, high-temperature members such as an exhaust manifold and a turbocharger are provided. In order to prevent the heat from these high-temperature members from damaging an intake duct of an intake system, the intake air is removed. It is known that the duct is covered with a heat shield to block heat from the high temperature member (see Japanese Utility Model Publication No. 1-39894).

[0003]

By the way, the temperature of the outside air introduced into the intake system of the engine through the intake duct is
It is desirable that the temperature be low from the viewpoint of improving the fresh air charging efficiency. However, even if the temperature of the intake duct itself is prevented from rising as in the above-described conventional case, if the temperature of the outside air introduced from the intake port is high, the engine is Performance may not be fully exhibited.

In order to avoid such a problem, it is considered that the intake port of the intake duct is opened inside the fender or in the vicinity of the front grill. In the former case, the intake sound is generated inside the fender. In the latter case, there is a possibility that water lock may occur when the weather is strong.

The present invention has been made in view of the above circumstances, and when the intake port of the intake duct is opened inside the engine room, the temperature of the outside air introduced into the air cleaner from the intake port is controlled as much as possible. It is an object of the present invention to provide a structure for reducing the intake air temperature of an engine intake system which can be kept at a low temperature.

[0006]

In order to achieve the above object, an intake air temperature reducing structure for an engine intake system according to the present invention comprises a fan shroud provided at a rear portion of a radiator disposed at a front portion in a vehicle traveling direction of an engine room of an automobile. In addition, the external air introduced from the inlet opening in the engine room is located near the fan shroud to provide a sound deadening means.
In an engine intake system for supplying air to the air cleaner through an intake duct provided, an outer shape of the fan shroud is provided between the fan shroud of the radiator and the muffling means.
Partly extending along the rear of the shroud with a cross-sectional shape
It is interposed building shaped shielding member Rutotomoni, toward the intake port of the intake duct in the opposite direction relative to the shielding member, before
The shielding member is independent of the intake duct,
It is fixedly supported via a plurality of different support surfaces , and its shielding portion
The rear end of the material is located forward of the rear end of the suction port . According to this feature, the radiator backwind
Prevents damage to the air intake duct and the silencing means due to the heat of the air
Not only that, the high-temperature radiator
And it is difficult to turn around to the suction port side, and the radiator
Avoids introduction from duct to air cleaner
You.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view of a front part of a vehicle body of an automobile, and FIG.
2 is a sectional view taken along line 2, FIG. 3 is a view in the direction of arrow 3 in FIG. 2, and FIG.
4 is a sectional view taken along line 4-4, FIG. 5 is a sectional view taken along line 5-5 in FIG.
FIG. 6 is a sectional view taken along line 6-6 of FIG.

As shown in FIG. 1, an engine E is mounted horizontally on the front of the vehicle body of the automobile, and a radiator R and an intake system I are arranged in a space on the right front of the engine E.

As will be apparent from referring to FIGS. 2 and 3 together, the radiator R has a structure in which an upper tank 1 and a lower tank 2 are connected by a rectangular core 3, and a rear portion thereof has a generally annular fan shroud. 4 are provided.
A motor 7 is supported at the center of a support member 6 attached to the rear surfaces of the upper tank 1 and the lower tank 2 via two brackets 5 each provided above and below, and a radiator fan 8 fixed to the output shaft of the motor 7 is internally provided in the fan shroud 4. Is driven to rotate.

An intake system I of the engine E includes an intake duct 9,
The air cleaner 10, the air cleaner hose 11, the throttle valve 12, the intake manifold 13, and the first and second resonator chambers 14 and 15 as a sound deadening means provided in the air intake duct 9 and a sound deadening device 16.

A wheel apron 19 is attached to a wheel house 19 which connects the fender 17 and the side frame 18.
₁ and the damper housing 19 ₂ is formed integrally, the air cleaner 10 is supported straddling its wheel apron 19 ₁ to the upper surface of the side frame 18. The air cleaner 10 includes an upper case 20 and a lower case 21, and an element (not shown) is housed inside the air cleaner 10.

The intake duct 9 for introducing outside air into the air cleaner 10 is provided with an intake port 22 ₁ opening toward the right side of the vehicle body, that is, the side opposite to the engine E. An L-shaped first intake duct 22 that is bent at a right angle to, and a downstream end of the first intake duct 22 that bypasses the lower portion of the side frame 18 and penetrates the wheel apron 19 ₁ upwards. and a second intake duct 23 of the U-shape is connected to the inlet 21 ₁ of the lower case 21.

The first intake duct 22 communicates with the first resonator chamber 14 via a branch pipe 22 ₂ , and the second intake duct 23 communicates with the second resonator chamber 15 via a branch pipe 23 ₁ . The intake noise in the intake duct 9 is reduced by the resonance of the air inside the resonator chambers 14 and 15.

[0015] Figures 4 and 5 as referring evident also to, the elliptical bulged portion 22 ₃ of which is formed at the downstream end of the first intake duct 22, the sound absorbing material 24 of the muffler 16
Is attached. Sound absorbing material 24 is obtained by forming a urethane or fibrous material in an annular, said mounted to fit inside the bulging portion 22 _3, the inner peripheral forms part of the inner wall of the first intake duct 22 It is supported by an elliptical cylindrical plate 25. Number of openings 25 ₁ to the plate 25 is bored, internal of the bulging portion 22 ₃ which houses the internal and sound absorbing material 24 of the first intake duct 22 through the opening 25 ₁ to communicate with each other. Thus, the pair of resonator chambers 14, 15
In addition to the above, reduction of the intake noise in the intake duct 9 is also achieved by the silencer 16.

The throttle valve 12 provided in the intake manifold 13 of the outlet 20 ₁ and the engine E which is formed on the upper case 20 of the air cleaner 10 is connected by an air cleaner hose 11 having flexibility.

As shown in FIGS. 1 to 3 and 6, between the radiator R and the intake system I, more specifically, the right side of the fan shroud 4 of the radiator R and the left side of the intake duct 9 near the same. An air guide plate 26 for guiding the back wind of the radiator R rearward is provided between them. The air guide plate 26 made of a curved resin plate-like member has an outer shape of the fan shroud 4.
A rear part of the shroud 4 having a cross-sectional shape partially along
Is arranged so as to extend (specifically, the outlet end of the right side surface of the fan shroud 4 is extended rearward ), and has a function of shielding the back wind of the radiator R from directly hitting the intake duct 9. . As apparent from FIG. 6, the air guide plate 26 and the bolt holes 26 ₁ formed at its rear end, through the bolt holes 27 ₁ formed in the bracket 27 which projects from the baffle plate 26 in the vehicle body right directions The second intake duct 23 of the intake duct 9 is formed by the two bolts 28 and 29.
Bosses 23 formed on the left and front walls near the upstream end of the
_2, 23 _3, the distal end surface of the different support surfaces directional
Fixedly supported by f ₁ and f ₂ . In this way, the air guide plate 26 is provided only on the second intake duct 23, and a plurality of support surfaces having different directions are provided.
By supporting them with f ₁ and f ₂ , not only can they be easily attached and detached, but also the baffle plate 26 can be supported.
It can be stabilized, and the air guide plate 26
The intake duct 9 (second intake duct) to be closely related
23), supporting them at multiple locations
The precision control of the holding part is also easy, and the air guide plate 26 is
Can be accurately fixed to the desired proper function position for
In addition, the air guide plate 26 is connected to the intake duct 9 (the second intake duct).
If you make a small assembly in advance in 23), the engine room
The air guide plate 26 can be set simultaneously with the setting of the duct.

Further, the air guide plate 26 is provided with the fan shroud 4.
The shroud 4 has a cross-sectional shape partially along the outer shape.
It extends rearward, and the rear end e of the baffle plate 26
Due to the position in front of the rear end of the inlet 22 _1, absorbent
Effect towards the opposite direction the inlet 22 ₁ relative to the baffle plate 26
Can both phase俟the conductor-like plate 26 itself as much as possible in miniaturization before and after me
In addition, this can be installed in a small space in the engine room,
Easily without significant changes in the layout of functional parts
Be able to incorporate.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

Radiator fan 8 driven by motor 7
The outside air introduced from the front of the vehicle body passes through the core 3 of the radiator R to cool the engine cooling water, and the back wind of the radiator R heated by passing through the core 3 is guided to the fan shroud 4 to be in the engine room. And is used for cooling high-temperature members such as an exhaust manifold. On the other hand, the outside air taken in through the intake port 22 ₁ is supplied to the air cleaner 10 through the intake duct 9 composed of the first intake duct 22 and the second intake duct 23, and from there, the air cleaner hose 11, the throttle valve 12, and the intake air. The power is supplied to the engine E via the manifold 13. that time,
The intake noise of the engine E is generated by the first resonator chamber 14 and the silencer 16 provided in the first intake duct 22 and the second resonator chamber 15 provided in the second intake duct 23.
Is muted at

At this time, the intake port 2 of the first intake duct 22
2 ₁ is opened on the right side of the vehicle body, that is, in the direction away from the baffle plate 26, and the back wind of the radiator R is directed to the intake port 22 ₁ side by the baffle plate 26 arranged on the rear right side of the fan shroud 4. Since it is prevented from sneaking around, it is possible to effectively prevent the high-temperature back wind from being introduced into the intake system I and reducing the efficiency of charging fresh air.
Further, the wind guide plate 26 prevents the back wind of the radiator R from directly acting on the intake duct 9 itself or both of the resonator chambers 14 and 15 and the silencer 16 provided in the intake duct 9 to reduce the intake noise. A drop is avoided. That is, the resonance frequency of the resonator chambers 14 and 15 depends on the speed of sound, that is, the intake air temperature, but by preventing the rise of the intake air temperature, the resonance frequency shift is prevented and the performance of the resonator chambers 14 and 15 is sufficiently improved. Can be demonstrated. In addition, the influence of heat on the sound absorbing material 24 of the intake duct 9 itself and the sound deadening device 16 is reduced, thereby preventing heat damage and maintaining sound deadening performance.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above-described embodiments, and various small designs may be made without departing from the present invention described in the appended claims. Ru der possible to make changes.

[0023]

As described above , according to the present invention , the fan shroud of the radiator and the position near the shroud are located.
With interposing the shield member between the muffler intake duct, since the intake port of the intake duct toward the <br/> opposite directions with respect to the shielding member, the air intake duct and muffler due to the heat radiator back style Not only is it prevented from being damaged, but also the hot radiator back wind is blocked by the shielding member, making it difficult for the radiator back wind to enter the duct suction port side. As a result, the radiator backwind is prevented from being introduced into the air cleaner from the intake duct, the efficiency of charging fresh air is improved, and the output of the engine is increased.
And the thermal shadow of the silencing means
Hibiki improved maintenance and durability silencing performance are relaxed is achieved
You.

In particular, the shielding member is a fan shroud.
After the shroud, having a cross-sectional shape partially along the outer shape
And the rear end of the shielding member is
Because it is located on the front side of the rear end of the inlet,
In combination with the effect of turning the shielding member in the opposite direction, the shielding
The shielding member itself can be miniaturized back and forth as much as possible,
Other functions for shielding members in a small space in the engine room
Easy assembly without significant changes in component layout
Can increase the degree of freedom in design.
You.

Further, the shielding member is provided solely in the intake duct.
It is fixedly supported via multiple support surfaces with different directions
Therefore, the support for the shielding member can be stabilized.
The shielding member is also subject to vibration and noise due to complicated vibration of the vehicle body.
To reduce the risk of
And the shielding member is functionally closely associated with it.
Only at the common intake duct that can be supported at multiple locations
This makes it easier to control the accuracy of those supports ,
Accuracy of the shielding member at the intended function position with respect to the intake duct
It can be fixed accurately and accurately, and the shielding member is suctioned.
If it is pre-assembled in the duct,
The setting of the shielding member can be completed at the same time as the setting of the duct,
As a whole, it can greatly contribute to the improvement of assembly workability.
Wear.

[Brief description of the drawings]

FIG. 1 is a plan view of a front portion of a vehicle body of an automobile.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a view in the direction of arrows in FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3;

[Explanation of symbols]

4 ... Fan shroud 9 ... Intake duct 10 ... Air cleaner 14 ... Resonator chamber (silencer) 15 ... Resonator chamber (silencer) 16 ... Silencer (silencer) 22 ₁ ··· Suction port 26 ··· Blower plate (shielding member) R ··· Radiator e ··· Far end f ₁ , f ₂ ··· Front end face as support surface

 ───────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-195021 (JP, A) JP-A-63-149220 (JP, A) Fully open 1987-95940 (JP, U) Really open 1980 35368 (JP, U) Fully open sho 60-3117 (JP, U) Fully open Hei 4-59364 (JP, U) Fully open 1979-151026 (JP, U) Fully open, 49-57727 (JP, U) Shokai 59-88263 (JP, U)

Claims (1)

(57) [Claims] Provided with a fan shroud (4) in the rear part of claim 1. A radiator is disposed in the vehicle traveling direction front of the engine room of an automobile (R), introduced from the opening to the inlet port (22 ₁₎ in the engine room the outdoor air, the full
Located near the shroud (4)
In an engine intake system for supplying to an air cleaner (10) through an intake duct (9) provided with an air duct (4, 15, 16), a fan shroud (4) of the radiator (R) and a muffler are provided.
Between the means (14, 15, 16), the fan Shura
The shell has a cross-sectional shape partially along the outer shape of the wood (4).
Plate-shaped shielding member (26) extending rearward of the louds (4 )
Is interposed Rutotomoni, the directed inlet of the intake duct (9) to (22 ₁₎ in the opposite direction the relative shield member (26), said shielding member (26) alone into the intake duct (9)
And a plurality of support surfaces (f ₁ , f ₂ ) having different directions
And the rear end of the shielding member (26)
Located in front of the rear end of (e) said suction port (22 ₁₎
The structure that reduces the intake air temperature of the engine intake system.