JPH11229908A - Resin air volume control device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent sticking of a frozen throttle valve in a cold region or the like, so-called sticking phenomenon. To achieve the above object, a throttle body constituting an intake passage of an internal combustion engine, a throttle shaft rotatably supported by the throttle body, and a flow passage area of the intake passage attached to the throttle shaft are reduced. A resin air amount control device provided with a throttle valve for changing, wherein at least one of a throttle body and a throttle valve is formed of a thermoplastic resin and a silicone resin powder, and the content of the silicone resin powder is controlled by the silicone resin powder. 0.1 to 7 per 100 parts by weight of thermoplastic resin
0 parts by weight, and the silicone resin powder is 0.5 μm
It has an average particle diameter of １２12 μm, and the distribution coefficient of the silicone resin powder is in the range of 1-10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine (hereinafter referred to as "internal combustion engine").
The present invention relates to a device for controlling the amount of intake air by a throttle valve installed in an intake passage of an internal combustion engine. More specifically, at least one of a throttle body and a throttle valve is made of a thermoplastic material for the purpose of weight reduction or the like. The present invention relates to an air amount control device formed of resin.

[0002]

2. Description of the Related Art Conventionally, an engine provided with a fuel injection system usually takes in outside air without heating intake air. Therefore, when traveling in cold regions, cold outside air enters the intake passage as it is, so that icing occurs near the throttle valve, and this phenomenon occurs remarkably especially when traveling on a water road or a snowy road. . It is also known that even in an engine employing an EGR (exhaust gas reburning) system, moisture adhering to the throttle valve may freeze due to moisture in the exhaust gas guided near the throttle valve. If the throttle valve sticks due to icing, so-called "sticking phenomenon", the smooth operation of the throttle valve is hindered, and the driving performance of the vehicle may be impaired, such as an increase in accelerator pedal effort.

[0003] Conventionally, the engine cooling water is circulated around the throttle body (hereinafter, referred to as hot water heating), and in the case of a carburetor (carburetor), a heater is embedded around the throttle valve (hereinafter, referred to as a carburetor). , Heater heating) to heat the throttle body to prevent icing in the intake passage. However, when the throttle body and throttle valve for the purpose of weight reduction are made of synthetic resin, compared with the throttle body and throttle valve using metal such as aluminum alloy and brass which are currently mainstream, the synthetic resin is Due to the low thermal conductivity, even when heating with hot water or heating, the temperature rise of the bore wall of the throttle body was not sufficient, and there was no problem that it took a long time to raise the temperature. . As a means for solving such a problem, the following invention or device has been disclosed as a structure for preventing a sticking phenomenon of a throttle valve caused by freezing of a resin air amount control device.

(1) A metal cylinder is integrally provided on an inner wall surrounding a throttle valve of a resin throttle body, and a hot water pipe for heating the cylinder is buried in the resin throttle body, so that icing is performed. To prevent Such or similar inventions or devices include:
JP-A-2-91431, JP-A-3-17241, JP-A-4-119338, JP-A-4-11
No. 9352 and JP-A-7-77108.

(2) A heater is buried in the inner wall of the bore of the resin throttle body to prevent icing due to the heat generated by the heater (Japanese Utility Model Laid-Open No. 3-17242). (1)
Similarly to the above, a device in which a metal cylindrical body having high thermal conductivity is integrally provided on an inner wall surrounding a throttle valve of a resin throttle body (Japanese Utility Model Laid-Open No. 4-1193).
No. 37).

(3) An insert bush made of a metal material is integrally incorporated into the inside of the body, and icing is prevented by forming the downstream end of the insert bush on a flange abutting on the engine side ( Hikaru 4-
No. 49651).

(5) A resin film having a low thermal conductivity and a low friction coefficient is formed on the surface of the throttle valve by applying a resin coating or a resin tape to prevent icing (Japanese Utility Model Laid-Open No. 4-134463).

[0008]

However, among the above-mentioned known techniques (1) to (4), (1) to (3) are for use as a heat source for engine cooling water or an engine or engine peripheral parts, or a heater. Since it is difficult to instantaneously raise the temperature of the throttle body by heating, there remains a problem that it is difficult to completely prevent icing that occurs when the engine is started (when the engine is cold) in the early morning of a cold region. Further, in the known technique (4), there is a problem that the resin film is peeled off by the heat source of the engine when used for a long time. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems, and provides a resin air amount control device capable of freely rotating a throttle valve even in a low-temperature environment.

[0009]

In order to achieve the above object, a resin air control device according to the present invention comprises a throttle body forming an intake passage of an internal combustion engine, and a throttle rotatably supported by the throttle body. A throttle and a resin air amount control device attached to the throttle shaft, the throttle valve changing a flow area of the intake passage, wherein at least one of the throttle body and the throttle valve is made of a thermoplastic resin. It is formed from a silicone resin powder, the content of the silicone resin powder is 0.1 to 70 parts by weight based on 100 parts by weight of the thermoplastic resin, and the silicone resin powder is
It has an average particle size of 0.5 μm to 12 μm, and the distribution coefficient of the silicone resin powder is in the range of 1 to 10.

In a preferred embodiment of the resin-made air flow control device of the present invention, the thermoplastic resin is a crystalline resin such as polyphenylene sulfide resin (PPS), polyamide resin (PA), or aromatic polyamide resin (PPA). And polycarbonate resin (PC).

In a preferred embodiment of the resin-made air flow control device of the present invention, the thermoplastic resin is a non-crystalline resin such as polyethersulfone (PES), polyetherimide resin (PEI), and polyamideimide resin ( PAI)
And polyester resin (PBT).

In the resin air amount control device of the present invention,
The content of the silicone resin powder is a thermoplastic resin 10
0.1 to 70 parts by weight with respect to 0 parts by weight. When the content of the silicone resin powder is less than 0.1 part by weight, it is inconvenient because the water repellency effect of the thermoplastic resin surface does not appear and sticking due to icing is not improved. This is inconvenient because the flowability of the thermoplastic resin is reduced, which causes poor running of the melt during molding.

[0013] In the resin air amount control device of the present invention,
The silicone resin powder has an average particle size of 0.5m to 12m. Preferably, the particle shape of the silicone resin powder is a true sphere. When the average particle diameter of the powder is less than 0.5 μm, the ratio of the particles dispersed on the surface of the thermoplastic resin is reduced, so that the sticking due to icing is not improved. If it exceeds 12 μm, the distance between the particles dispersed on the surface of the thermoplastic resin increases, and the area of icing of water on the resin surface increases, so that sticking due to icing is not improved, which is inconvenient.

[0014] In the resin air amount control device of the present invention,
The distribution coefficient (Di) of the silicone resin powder is 1 to 1
It is characterized by being in the range of 0. When the distribution coefficient exceeds 10, the occupied volume of the powder having a large particle diameter increases,
This is inconvenient because the concentration of particles dispersed on the resin surface is reduced, and sticking due to freezing is not improved. The distribution coefficient is a value obtained by dividing the number average particle diameter (Ln) and the length-weighted average particle diameter (Lw) as shown below.

(Equation 1)

In a preferred embodiment of the resin-made air flow control device of the present invention, the silicone resin powder is a siloxane compound, and the compound is a polymethylsiloxane (PM) having a silsesquioxane structure having a methyl group as a substituent.
S).

In addition, glass fibers, carbon fibers, inorganic fibers such as ceramic fibers and mineral fibers, or organic fibers such as aramid, or flame retardants, antioxidants, ultraviolet absorbers, etc. used as reinforcing materials for thermoplastic resins. Various stabilizers such as a lubricant, a colorant, and a heat stabilizer and a filler may be added within a range that does not impair moldability, mechanical characteristics, and the like. Further, as a molding method of the throttle body and the throttle valve, after kneading the silicone resin powder into a thermoplastic resin, an injection molding method, a press molding method, or a method of increasing the concentration of the silicone resin powder near the surface layer of the throttle body and the throttle valve is used. The molding can be performed by appropriately employing a two-color molding method, a decorative molding method, or the like, and is not particularly limited to any of the above-described molding methods.

The throttle body and / or throttle valve for the resin air control device of the present invention obtained by molding in this manner always shows good sticking characteristics.
Incidentally, the reason why the sticking property is improved is that, due to the preferable addition amount of the silicone resin powder having a siloxane bond dispersed in the thermoplastic resin, the distance between the particles of the silicone resin powder having the siloxane bond is in a dew condensation state. It is thought that the above-mentioned sticking characteristics can be improved because the contact area between the thermoplastic resin and the water particles becomes smaller.

[0018]

According to the present invention, at least one of the throttle body and the throttle valve in the air amount control device is formed of a thermoplastic resin and a silicone resin, so that the moisture in the intake passage of the internal combustion engine is formed of the resin. Even if it freezes on the throttle body or the surface of the throttle valve, the sticking torque of the throttle valve during freezing can be reduced to a level at which there is no practical problem.

Hereinafter, the present invention will be further described with reference to examples, but it is needless to say that the present invention is not limited to these examples.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a method of measuring sticking force due to freezing of a throttle body and / or a throttle shaft according to the present invention will be described with reference to FIG. As shown in FIG. 1 (a), a flat plate (100 mm × 100 mm × 3 mm: hereafter referred to as a molded object) was prepared by compounding a silicone resin powder with a thermoplastic resin based on the following examples, kneading the mixture, and molding by a press method. 11) is degreased with an organic solvent (acetone and toluene) to form a degreased surface 12. Next, as shown in FIG. 1 (b), the molded body 11 is fixed to a fixed base 13 which is kept horizontal, and 1 cc of water is sprayed.
4 is applied to the surface for measuring the freezing force of the formed body 11 from a distance of 30 cm in a substantially uniform mist state. Next, as shown in FIG. 1C, a cylindrical bush (material: PPS: 770F1X2, outer diameter 26 m) is formed at the center of the frozen measurement surface of the molded body 11 to which the atomized water 15 adheres.
m, inner diameter 20 mm, height 15 mm) 16. Next, as shown in FIG. 3D, the cylindrical bush 16 left on the molded object 11 is left in a windless environment of -35 ° C. to -40 ° C. for 30 minutes, and the molded object 11 and the cylindrical bush are set. After icing, the bush pull gauge (push-pull scale FB10K manufactured by Imada Co., Ltd.) 18 is pressed against the cylindrical bush 16 in a direction parallel to the icing surface in a windless environment at -35 ° C to -40 ° C. Then, the load until the cylindrical bush 16 peels off is measured. In FIG. 1D, reference numeral 17 denotes the formed ice. The load value measured in this way is
Of the throttle body and / or the throttling valve according to the present invention. Normally, the torque at which the throttle body and the throttle valve start to open is set to about 0.4 Nm. Therefore, the sticking force of the present embodiment was measured as 0.2 N · m, which is difficult for the driver to detect as the increase in the pedaling force of the accelerator pedal and does not hinder practical use. .1 Mpa. In addition, since the return torque of the throttle valve is set to about 0.3 Nm, if the sticking force can be suppressed to a sticking force of 0.1 MPa level, the sticking phenomenon due to icing causes the throttle valve to reach the fully closed position. There is no problem that cannot return.

Next, the molded body used in the examples was prepared by melting thermoplastic resin pellets in a Labo Plastomill Kneader (manufactured by Toyo Seiki Seisaku-sho, Ltd.), and the silicone resin powder was described in the following examples. After mixing and kneading as described above, a flat plate molded product was obtained by a press method.

As the thermoplastic resin, a polyphenylene sulfide resin (PPS, trade name: Torelina A670) manufactured by Toray Industries, Ltd., and a polyamide MXD6 resin (PA, trade name: Lenny 6002) manufactured by Mitsubishi Engineering-Plastics Corporation are used. , Teijin Amoco Engineering Plastics Co., Ltd., aromatic polyamide (PPA, trade name: AMODEL A1000), GE Plastics polycarbonate resin (P
C, trade name: LEXAN LS2-111), polyethersulfone resin (PES, trade name: VICTREX4800G) from Sumitomo Chemical Co., Ltd., polyetherimide resin (PEI, trade name: Ultem, manufactured by GE Plastics) 1000), a polyamide-imide resin (PAI, trade name: Torlon 4203L) manufactured by Teijin Amoko Engineering Plastics Co., Ltd.
And GE Plastics polyester resin (PBT (polybutylene terephthalate)), trade name: VAL0X310. The silicone resin powder is a silicone resin fine particle (trade name: Tospearl 105, 145, manufactured by Toshiba Silicone).
3120, 240).

Hereinafter, examples of the present invention will be further described with reference to Tables 1 and 2.

[0023]

[Table 1]

[0024]

[Table 2]

Table 1 shows an embodiment of the present invention, and Table 2 shows an example for comparison with the embodiment. Tables 1 and 2 show the type of thermoplastic resin, the content of the silicone resin powder, the average particle size of the silicone resin powder, the distribution coefficient of the silicone resin powder, and the sticking strength for each of the examples and examples to be compared with the examples. .

(1) Content of Silicone Resin Powder With respect to 100% by weight of polyphenylene sulfide (PPS), 0.1% of a silicone resin powder having an average particle size of 12 μm was added.
The mixture was kneaded and molded at a ratio of not more than 05% by weight to obtain a flat plate. In this case, the content of the silicone resin powder was such that the sticking force was greater than 0.1 MPa as shown in Comparative Example 11, and sticking due to freezing was not improved. In addition, PPS 10
When the content of silicone resin powder having an average particle diameter of 12 μm and an average particle diameter of 0.5 μm is 70% by weight with respect to 0% by weight, as shown in Examples 4 and 7, the average particle diameter of the silicone resin powder is 12 μm and 0 μm. There is no difference from the case where the silicone resin powder content of 0.5 μm is 60% by weight (Examples 3 and 6). This means that even if the silicone resin powder is added in an amount exceeding 70% by weight, the effect of further reducing the sticking force cannot be expected. Also, if the resin type (material) is P
A, PPA, PC, PES, PEI, PAI and PB
When T does not contain the silicone resin powder in each of the resins, the sticking force is greater than 0.1 MPa as shown in Comparative Examples 3 to 10. On the other hand, PA, PPA, PC,
Resin 10 of each of PES, PEI, PAI and PBT
In a case where the content of silicone resin powder having an average particle diameter of 12 μm = 0.1% by weight with respect to 0% by weight, the sticking force ≦ 0.1 MPa as shown in Examples 9 to 17, and Sticking is improved.

(2) Average particle size of silicone resin powder With respect to 100% by weight of PPS, the content of silicone resin powder having an average particle size of 0.5 μm, 4.5 μm and 12 μm is 0.1% by weight. When blended, as shown in Examples 5, 8, and 16, the sticking force ≦ 0.
It becomes 1 MPa, and sticking due to icing is improved. On the other hand, if the silicone resin powder content is 0.1% by weight and the average particle size of the silicone resin powder is 15 μm with respect to 100% by weight of PPS, the sticking force is> 0.1 MPa from the result of Comparative Example 12, and Is not improved.

(3) When the silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 0.1 was blended in an amount of 0.1 wt. As shown, the sticking force = 0.10 MPa, and sticking due to freezing is improved. On the other hand, when 0.1% by weight of a silicone resin powder having a particle distribution coefficient of 13 is blended with 100% by weight of PPS, the sticking force is> 0.10 MPa as shown in Comparative Example 13, and Is not improved.

Examples 1, 2, 3, 4 In Example 1, polyphenylene sulfide (PPS)
100% by weight, the content of silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 1.01 was 0.1% by weight. In Example 2, 100% by weight of PPS was used.
The content of the silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 1.01 was 0.5% by weight.
With respect to 100% by weight of PPS, the content of silicon resin powder having an average particle diameter of 12 μm and a distribution coefficient of particles of 1.01 was 60% by weight, and in Example 4, the average particle diameter of 12 μm and particles was 100% by weight of PPS. Distribution coefficient of 1.01
With the silicone resin powder content of 70% by weight, the two were kneaded with a Labo Plast mill to obtain a flat plate for press molding evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 1 shows the results. Next, the throttle body and the throttle valve of the present invention were formed by the same operation as described above.

Examples 5, 6, 7 In Example 5, the content of silicone resin powder having an average particle diameter of 0.5 μm and a particle distribution coefficient of 1.02 was 0.1% by weight, based on 100% by weight of PPS. In the sixth embodiment, the PPS
With respect to 100% by weight, the content of the silicone resin powder having an average particle diameter of 0.5 μm and a particle distribution coefficient of 1.02 was 6
In Example 7, the average particle diameter was 0.5 μm and the particle diameter distribution coefficient was 1.02 with respect to 100% by weight of PPS.
With the silicone resin powder content of 70% by weight, the two were kneaded in a lab plast mill and press-molded to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 1 shows the results. Next, the throttle body and the throttle valve of the present invention were formed by the same operation as described above.

Example 8 In this example, with respect to 100% by weight of PPS, the content of silicone resin powder having an average particle size of 4.5 μm and a particle distribution coefficient of 1.01 was set to 0.1% by weight, and both were used as laboplasts. The mixture was kneaded in a mill and press-formed to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 1 shows the results. Next, the throttle body and the throttle valve of the present invention were formed by the same operation as described above.

Embodiments 9, 10, 11, 12, 13, 1
In Example 9, the content of silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 1.01 was 0.1% by weight with respect to 100% by weight of PA.
With respect to 100% by weight, the content of the silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 1.01 was set at 0.1%.
In Example 11, the average particle diameter was 12 μm and the particle distribution coefficient was 1.01 with respect to 100% by weight of PC.
0.1% by weight of silicone resin powder in Example 1,
In the case of No. 2, the average particle size is
0.1% by weight of a silicone resin powder having a particle size distribution coefficient of 1.01 μm and a particle distribution coefficient of 1.01.
With respect to 100% by weight, the content of the silicone resin powder having an average particle size of 12 μm and a particle distribution coefficient of 1.01 was 0.1%.
In Example 14, the content of silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 1.01 was 0.1% by weight with respect to 100% by weight of PAI, and in Example 15, PBT was 100% by weight. %, The thermoplastic resin and the silicone resin powder were both kneaded with a Labo Plast mill, with the content of the silicone resin powder having an average particle size of 12 μm and a particle distribution coefficient of 1.01 being 0.1% by weight. Then, press molding was performed to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 1 shows the results. Next, the throttle body and the throttle valve of the present invention were formed by the same operation as described above.

Examples 16 and 17 In Example 16, the content of silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 5.6 was 0.1% by weight with respect to 100% by weight of PPS. , 12
Assuming that the content of the silicone resin powder having a particle size of 10 μm and the distribution coefficient of the particles is 0.1% by weight, both the thermoplastic resin and the silicone resin powder are kneaded with a lab plast mill and press-molded to obtain a plate for evaluation. Was. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 1 shows the results. Next, the throttle body and the throttle valve of the present invention were formed by the same operation as described above.

Comparative Examples 1 and 2 In Comparative Example 1, an aluminum flat plate (ADC12) was used.
Then, a flat plate for evaluation was obtained using a brass flat plate (C2600). The obtained flat plate was subjected to the sticking force measurement test as described above. Table 2 shows the results.

Comparative Examples 3, 4, 5, 6 , 7, 8, 9 , 10 PPS in Comparative Example 3, PA in Comparative Example 4, and Comparative Example 5
Then, PPA, PC in Comparative Example 6, and P in Comparative Example 7.
ES, PEI in Comparative Example 8, PAI in Comparative Example 9,
In Comparative Example 10, PBT was used as the thermoplastic resin, and the silicone resin powder was not used.
The mixture was kneaded with a Labo Plastmill and press-molded to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 2 shows the results.

Comparative Example 11 In this example, the content of silicone resin powder having an average particle diameter of 12 μm and a particle distribution coefficient of 1.01 was set to 0.05% by weight with respect to 100% by weight of PPS, and the thermoplastic resin (PPS) was used. ) And a silicone resin powder were kneaded in a lab plast mill and press-molded to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 2 shows the results.

Comparative Example 12 In this example, the content of silicone resin powder having an average particle size of 15 μm and a particle distribution coefficient of 1.03 was set to 0.1% by weight with respect to 100% by weight of PPS, and the thermoplastic resin (PPS) was used. ) And a silicone resin powder were kneaded in a lab plast mill and press-molded to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 2 shows the results.

Comparative Example 13 In this example, the content of silicone resin powder having an average particle size of 12 μm and a particle distribution coefficient of 13 was set at 0.1% by weight with respect to 100% by weight of PPS, and the thermoplastic resin (PP
Both S) and the silicone resin powder were kneaded with a lab plast mill and press-molded to obtain a flat plate for evaluation. The obtained flat plate was subjected to the sticking force measurement test as described above. Table 2 shows the results.

[0039]

As described above, the present invention provides a throttle body constituting an intake passage of an internal combustion engine, a throttle shaft rotatably supported by the throttle body, and a throttle shaft mounted on the throttle shaft, A resin air amount control device provided with a throttle valve for changing a flow passage area of a passage, wherein at least one of the throttle body and the throttle valve is formed of a thermoplastic resin and silicone resin powder, and the silicone resin The content of the powder is 0.1 to 70 parts by weight based on 100 parts by weight of the thermoplastic resin, the silicone resin powder has an average particle size of 0.5 μm to 12 μm, and the silicone resin The distribution coefficient of the resin powder is 1 to 1
0, the icing (sticking) between the throttle body and the throttle valve, which occurs early in the morning in a cold region or when the engine is started (when the engine is cold), does not hinder practical use. It has become possible to reduce to the level.

[Brief description of the drawings]

1 (a) to 1 (d) are process diagrams illustrating a method for measuring a sticking force due to freezing of a flat plate (molded body) formed from a thermoplastic resin and a silicone resin powder according to the present invention. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Molded body 12 Degreasing surface 13 Fixing stand 14 Atomization 15 Cylindrical bush 16 Ice 17 Push pull gauge

Claims (4)

[Claims] 1. A throttle body constituting an intake passage of an internal combustion engine, a throttle shaft rotatably supported by the throttle body, and a throttle valve attached to the throttle shaft for changing a flow passage area of the intake passage. Wherein at least one of the throttle body and the throttle valve is formed of a thermoplastic resin and a silicone resin powder, and the content of the silicone resin powder is controlled by the thermoplastic resin. 0.1 to 70 parts by weight with respect to 100 parts by weight, and the silicone resin powder is 0.5 μm to 12 μm
Wherein said silicone resin powder has a distribution coefficient in the range of 1 to 10. 2. The method according to claim 1, wherein the thermoplastic resin is one of a polyphenylene sulfide resin (PPS), a polyamide resin (PA), an aromatic polyamide resin (PPA), and a polycarbonate resin (PC), which are crystalline resins. The resin-made air amount control device according to claim 1, characterized in that: 3. The thermoplastic resin is any one of non-crystalline resins such as polyethersulfone (PES), polyetherimide resin (PEI), polyamideimide resin (PAI) and polyester resin (PBT). The resin-made air amount control device according to claim 1, characterized in that: 4. The resin-made air flow control device according to claim 1, wherein the silicone resin is a polymethylsiloxane (PMS) having a silsesquioxane structure having a methyl group as a substituent.