JPH10331666A - Throttle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent hot water leakage while hardly lowering an icing preventive effect by hot water. SOLUTION: This valve is furnished with a main body 1 forming an air intake passage, a throttle shaft provided on the main body 1 free to rotate and a throttle valve installed on the throttle shaft and free to open and close the air intake passage. The main body 1 is made of a resin by insert-molding a metallic core 5 forming the air intake passage in the neighbourhood of the throttle valve, and it is furnished with a hot water passage 10 in which hot water to heat the core 5 flows. A hot water reservoir 12 is continuously provided with the core 5 and is formed of a metallic bulkhead 11 to partition it from the main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a throttle body for an engine.

[0002]

2. Description of the Related Art An example of a conventional throttle body will be described with reference to a sectional view of FIG. The throttle body includes a body main body 101 forming an intake passage 102, a throttle shaft 103 rotatably provided on the body main body 101, a throttle valve 104 attached to the throttle shaft 103 and capable of opening and closing the intake passage 102. It has. The body 101 is
A metal core 105 that forms the intake passage 102 near the throttle valve 104 is made of insert-molded resin. A warm water reservoir 112 through which warm water flows is formed in the body main body 101, and a protrusion 105 a provided on an outer peripheral surface of the core 105 is exposed to the warm water reservoir 112.

[0003] In the throttle body, by forming an intake passage 102 near the throttle valve 104 with a metal core 105, thermal contraction of the resin body 101 is suppressed, and smooth operation of the throttle valve 104 is ensured. The core 10 is heated by the hot water flowing through the hot water reservoir 112.
By heating No. 5, icing is prevented.
Such a throttle body is disclosed in, for example, JP-A-7-51902 and JP-A-4-119338.

[0004]

In the conventional throttle body, since the interface between the body main body 101 and the core 105 (indicated by the symbol X) continues to the hot water reservoir 112,
The hot water in the hot water reservoir 112 is supplied to the body 101 and the core 105.
Leakage from the gap at the interface X to the intake passage 102 (also referred to as hot water leakage) poses a problem. For example, body 1
01, and the linear expansion coefficient of the core 105 is μ.
When μ1> μ2, the interface X between the body body 101 and the core 105 is tightly adhered without any gap at room temperature and there is no leakage of hot water. Since the gap at the interface X with the core 105 is large, there is a problem that hot water leakage is likely to occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent hot water leakage without substantially reducing the icing prevention effect of the hot water. It is to provide a throttle body that can be used.

[0006]

According to a first aspect of the present invention, there is provided a body for forming an intake passage, a throttle shaft rotatably provided on the body.
A throttle valve attached to the throttle shaft and capable of opening and closing the intake passage; the body is made of a resin obtained by insert molding a metal core forming an intake passage near the throttle valve; Wherein a hot water reservoir forming the hot water passage is provided in the body main body, and the hot water reservoir is formed by a metal partition wall connected to the core and partitioned from the body main body. It is a throttle body characterized by doing. Claim 1
According to the throttle body described above, the heat of the hot water flowing through the hot water reservoir formed by the metal partition is transmitted through the partition to heat the core, so that an icing prevention effect can be obtained. In addition, a metal partition wall separates the resin body body and the hot water reservoir, and since the interface between the resin body body and the metal core does not follow the hot water reservoir, hot water leakage is prevented regardless of a temperature change. Can be.

According to a second aspect of the present invention, there is provided a body body forming an intake passage, a throttle shaft rotatably provided in the body body, and a throttle valve attached to the throttle shaft and capable of opening and closing the intake passage. The body body is made of a resin obtained by insert molding a metal core forming an intake passage near a throttle valve, and is a throttle body provided with a hot water passage through which hot water for heating the core flows. The passage wall forming the hot water passage is formed of metal, a space penetrating between the core and the passage wall is formed in the body main body, and the space is filled with a filler having excellent thermal conductivity. A throttle body characterized by the following. According to the throttle body of the second aspect, the heat of the hot water flowing in the hot water passage is transmitted from the passage wall of the hot water passage to the filler having excellent thermal conductivity to heat the core, so that an icing prevention effect can be obtained. Further, since the interface between the resin body and the metal core does not follow the hot water passage, hot water leakage can be prevented regardless of a temperature change.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 to 3 of the present invention will be described. Embodiment 1 Embodiment 1 will be described with reference to FIGS. FIG. 1 is a front sectional view of a throttle body.
FIG. 2 is a cross-sectional view showing a main part in a cross section taken along line AA of FIG.
FIG. 3 is a sectional view taken along line BB of FIG. As shown in FIG. 1, the throttle body includes a body main body 1 forming an intake passage 2, a throttle shaft 3 rotatably provided in the body main body 1, and a throttle body 3 attached to the throttle shaft 3 to form the intake passage 2. And a throttle valve 4 that can be opened and closed. The body body 1 is made of a resin such as glass fiber reinforced polyamide resin (PA) or glass fiber reinforced polybutylene terephthalate resin (PBT) manufactured by, for example, an injection molding method, and an intake passage 2 near the throttle valve 4. Is formed integrally by insert molding with a substantially ring-shaped metal core 5 made of, for example, aluminum or magnesium.

[0009] As shown in FIG.
An ISC valve housing (not shown) made of a metal such as aluminum, magnesium, or the like of an idle speed control device (hereinafter, referred to as an ISC valve) (FIG. 2 shows a part of a mounting portion to the body body 1). 7
Are attached by the attachment screws 6. As is well known, the ISC valve controls the amount of intake air that bypasses the throttle valve 4. The body body 1 is provided with an outward passage and an inward passage air passage (FIG. 2 shows only the outward passage air passage) 8 through which the intake air flowing through the ISC valve passes. As shown in FIG. 3, the ISC valve housing mounting surface of the body 1 is provided with an air outlet 8a of the outward air passage 8 and an air passage 8 of the backward air passage.
Is opened.

The ISC valve housing 7 is provided with hot water passages 10 on the outward and return routes through which engine cooling water as hot water circulates (FIG. 2 shows only the outward hot water passages). The hot water outlet 10 of the hot water passage 10 on the outward path is provided on the body mounting surface of the ISC valve housing 7.
a and a hot water inlet 10b (see a two-dot chain line in FIG. 3) of the hot water passage 10 on the return path.

As shown in FIG. 2 and FIG.
A hot water inlet 10b and a hot water outlet 1 of the hot water passage 10 at the mating surface with the ISC valve housing 7;
A hot water reservoir 12 communicating with Oa is provided. Thus, the hot water reservoir 12 is formed by a concave metal partition 11 which is separated from the body 1. The partition 11 is
The protruding portion 5 a protruding from the outer peripheral surface of the core 5 is integrally and continuously provided. The partition 11 has a communication hole 16 communicating with the air outlet 8a and the air inlet 8b of the air passage 8.
A flange portion 15 having a and 16b is formed.
The periphery of the partition 11 having the flange portion 15 is
Together with the protruding portion 5a. A screw hole 14 for the mounting screw 6 is provided in a peripheral portion of the partition 11.

The end face of the partition 11 having the flange portion 15 of the core 5 is flush with the mounting surface of the ISC valve housing of the body 1.
It faces the body body mounting surface of the C valve housing 7. As shown in FIG. 3, the end face of the partition 11 surrounds the hot water reservoir 12 and has an air outlet 8 of an air passage 8.
a and a mounting groove 17 surrounding the air inlet 8b. An elastic seal member 18 that seals with the ISC valve housing 7 is fitted in the mounting groove 17.

The engine cooling water supplied from the water jacket of the engine by the water pump is I
After passing through the hot water passage 10 on the outward path side of the SC valve housing 7, the hot water outlet 1a of the throttle body 1
2 through the hot water inlet 10b of the ISC valve housing 7
Circulates through the hot water passage 10 on the return path side and returns to the water jacket of the engine.

According to the throttle body, the heat of the hot water flowing through the hot water reservoir 12 formed by the metal partition 11 is transmitted from the partition 11 to the protruding portion 5a to heat the core 5, thereby providing an icing prevention effect. . In addition, a resin body 1 and a hot water reservoir 1 are formed by a metal partition 11.
2 and the interface between the resin body 1 and the metal core 5 does not continue to the hot water reservoir 12, so that hot water leakage can be prevented regardless of a temperature change. This embodiment corresponds to the first aspect of the present invention.

According to the throttle body, since the flange 15 is formed on the partition wall 11 of the metal core 5, the resin end faces of the air outlet 8a and the air inlet 8b of the air passage 8 of the body 1 are made of metal. Unlike the case of facing the mating surface (mounting surface) of the ISC valve housing 7, air is generated due to a gap between the mating surfaces of the metal ISC valve housing 7 and the resin body 1 due to a difference in linear expansion coefficient between the two. Leakage can be prevented.

[Second Embodiment] Next, a second embodiment will be described with reference to FIG. Since this embodiment is a modification of the first embodiment, only the modified portions will be described in detail. As shown in FIG. 4, in the present embodiment, the partition 11 having the projecting portion 5 a of the core 5 and the flange portion 15 in the first embodiment is eliminated. In the ISC valve housing 7, a hot water outlet 10a and a hot water inlet 10b of the hot water passage 10 are communicated with each other, and the hot water passage 10 is separated from the core 10. The hot water outlet 10a and the hot water inlet 10 of the hot water passage 10
The passage wall 20 corresponding to the portion communicating with the valve b is made of the same metal as the ISC valve housing 7. Further, the passage wall 20 of the ISC valve housing 7 is flush with the body main body mounting surface, and faces the ISC valve housing mounting surface of the body main body 1.

The body 1 is formed with a space (not shown) by forming a through hole 22 penetrating between the core 5 and the passage wall 20. In the space inside the through hole 22 of the body 1, the space is filled with a filler 23 having excellent heat conductivity. As the filler 23, for example, aluminum having excellent thermal conductivity,
Use elastic materials such as rubber, resin, and semi-fluid mixed with metal powder such as magnesium and brass, metal particles, and metal powder. In addition, the filler 23 is provided between the corresponding portion (reference numeral 5b) of the outer peripheral surface of the core 5 exposed by the formation of the through hole 22 and I.
The surface of the SC valve housing 7 is in surface contact with the portion including the passage wall 20 of the body main body mounting surface (reference numeral 7a is attached).

According to the throttle body of this embodiment, the heat of the hot water flowing through the hot water passage 10 is transferred to the passage wall 20 of the hot water passage 10.
By heating the core 5 by transmitting the filler 23 having excellent thermal conductivity from the core, an icing prevention effect can be obtained. In addition, since the interface between the resin body 1 and the metal core 5 does not continue to the hot water passage 10, hot water leakage can be prevented regardless of a temperature change. This embodiment corresponds to the second aspect of the present invention.

Further, according to the throttle body, since the filler 23 is filled in the through hole 22 of the body 1, for example, compared to a structure in which a rod-shaped heat conducting member is loosely fitted into the through hole 22. As a result, a material having good heat transfer efficiency can be obtained.

Third Embodiment A third embodiment will be described with reference to FIG. 5 which shows a cross-sectional view of a main part. This embodiment is a modification of the second embodiment, and therefore only the modified portions will be described in detail. As shown in FIG. 5, in the present embodiment, a metal block member 24 made of, for example, aluminum, magnesium or the like having excellent heat conductivity is embedded in the filler 23 of the second embodiment. According to the throttle body of this embodiment, the metal block member 24
The heat transfer efficiency can be improved as compared with the case where only the filler 23 is used.

It is possible to use a single solid material having excellent thermal conductivity as the filler 23. However, in the case of the solid material, the core 5 and the ISC valve housing 7 may be used due to variations in dimensional accuracy and assembly accuracy. It is difficult to make the contact surface with the same surface, and heat transfer is expected to be impaired. Therefore, at least the core 5 and the ISC valve housing 7
It is preferable to use an elastic material such as rubber, resin, or a semi-fluid mixed with metal powder, metal particles, or metal powder on the contact surface with the metal powder.

[0022]

According to the present invention, it is possible to prevent hot water leakage without substantially reducing the icing prevention effect of hot water.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a throttle body according to a first embodiment.

FIG. 2 is a cross-sectional view showing a main part in a cross section taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view showing a main part of the second embodiment.

FIG. 5 is a sectional view showing a main part of a third embodiment.

FIG. 6 is a cross-sectional view of a throttle body showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body main body 2 Intake passage 3 Throttle shaft 4 Throttle valve 5 Core 10 Hot water passage 11 Partition wall 12 Hot water reservoir 20 Passage wall 23 Filler

Claims (2)

[Claims] A body that forms an intake passage; a throttle shaft rotatably provided in the body;
A throttle valve attached to the throttle shaft and capable of opening and closing the intake passage; the body is made of a resin obtained by insert molding a metal core forming an intake passage near the throttle valve; Wherein a hot water reservoir forming the hot water passage is provided in the body main body, and the hot water reservoir is formed by a metal partition wall connected to the core and partitioned from the body main body. Throttle body characterized by doing. 2. A body main body forming an intake passage, a throttle shaft rotatably provided in the body main body,
A throttle valve attached to the throttle shaft and capable of opening and closing the intake passage; the body is made of a resin obtained by insert molding a metal core forming an intake passage near the throttle valve; A hot water passage through which a hot water passage is formed, wherein a passage wall forming a hot water passage separated from the core is formed of metal, and a space penetrating between the core and the passage wall is formed in the body main body. A throttle body formed and filled with a filler having excellent thermal conductivity in the space.