JP2008232001A - Throttle body and resin throttle valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the excellent operation of a resin throttle valve by preventing it from being molten by backfire. <P>SOLUTION: This throttle body 2 comprises a resin body 7 including a bore 6 and a resin throttle valve 9 for opening and closing the bore 6. A heat resistant layer 21 is formed on the outer peripheral surface of the resin throttle valve 9. The heat resistant layer 21 is formed of a DLC film by vapor deposition. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a throttle body used for an automobile engine, and more particularly to a throttle body including a resin throttle valve and a resin throttle valve used for the throttle body.

  Conventionally, for example, an automobile engine is provided with a throttle body including a throttle valve in order to adjust the amount of air flowing through the intake passage. The throttle body is configured such that its bore is opened and closed by a throttle valve. As a throttle body, a metal body such as an aluminum die-cast is well known, but recently, a resin throttle body formed by resin molding has been proposed for cost reduction and weight reduction. Patent Document 1 below discloses an example of this type of resin throttle body. The resin throttle body includes a resin body and a resin shaft valve (throttle valve and throttle shaft formed integrally).

Japanese Patent Laid-Open No. 2001-212846

  However, in the resin throttle body described in Patent Document 1, if a backfire occurs during engine start-up or idle operation with the throttle body mounted in the intake passage of the engine, high-temperature and high-pressure combustion gas or flame is generated. There was a possibility of instantaneous backflow from the combustion chamber to the intake passage, which could cause the resin shaft valve to melt. In particular, when the engine is started or idling, the shaft valve is slightly opened, and a slight gap may be formed between the outer periphery of the shaft valve and the inner wall of the bore. For this reason, the high-temperature and high-pressure combustion gas or flame caused by the backfire may instantaneously concentrate in the gap using the gap as a escape path, and the outer peripheral portion of the shaft valve may be melted. Further, if the backfire is intense, the entire surface of the shaft valve may be melted.

  Here, high-temperature and high-pressure combustion gas and flame are also in contact with the bore inner wall, but the bore inner wall is a part of the throttle body, so it has a larger heat capacity than the shaft valve, and it is more susceptible to erosion than the shaft valve. It's small. If the outer periphery of the shaft valve is melted, there is a concern that even if the shaft valve is fully closed, an unexpected gap is created between the valve and the inner wall of the bore, resulting in an increase in the air flow rate and malfunction of the idle operation. . Further, when the melted portion of the shaft valve is deformed into a protrusion shape, the protrusion interferes with the inner wall of the bore, which may cause malfunction of the stick such as a stick or a failure of full closure. Such a problem of the shaft valve (throttle valve) due to the backfire is a problem that has been newly recognized for the shaft valve (throttle valve) made of resin, and countermeasures are desired.

  Further, as a throttle body, a throttle shaft that rotatably supports a resin throttle valve with respect to the body, and a seal member that is provided on the throttle shaft and seals between the throttle shaft, the resin throttle valve, and the body, There is something with. In this type of throttle body, as described above, when a backfire occurs during engine start-up or idle operation, high-temperature and high-pressure combustion gas or flame instantaneously flows backward from the combustion chamber to the intake passage, and the seal member melts. There was a risk of damage. If the seal member melts, even if the throttle valve is fully closed, an unexpected gap is created between the valve, the throttle shaft, and the body. There was concern to become.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a resin throttle valve from being melted by a backfire and to ensure a good operation of the resin throttle valve. To provide a body. Another object of the present invention is to provide a throttle body capable of preventing the sealing member from being melted by the backfire and ensuring good operation of the resin throttle valve. Still another object of the present invention is to provide a resin throttle valve that can be used in a throttle body to prevent melting damage caused by a backfire.

  In order to achieve the above object, the invention according to claim 1 is a throttle body comprising a body including a bore and a resin throttle valve for opening and closing the bore, and at least the outer peripheral surface of the resin throttle valve is heat resistant. The purpose is to provide materials.

  According to the configuration of the invention, the heat resistance of at least the outer peripheral surface of the resin throttle valve is improved by the heat resistant material.

  In order to achieve the above object, a second aspect of the present invention provides a throttle body including a body including a bore and a resin throttle valve that opens and closes the bore, and a heat resistant layer is provided on the surface of the resin throttle valve. The purpose is.

  According to the configuration of the invention, the heat resistance of the surface of the resin throttle valve is improved by the heat resistant layer.

  In order to achieve the above object, a third aspect of the present invention is the invention according to the second aspect, wherein a heat resistant layer is provided on the entire surface of the resin throttle valve.

  According to the configuration of the invention, the heat resistance of the entire surface of the resin throttle valve is improved by the heat-resistant layer.

  In order to achieve the above object, the invention described in claim 4 is that, in the invention described in claim 2, a heat-resistant layer is provided on the outer peripheral surface of the resin throttle valve.

  According to the structure of the said invention, the heat resistance of the outer peripheral part surface of a resin-made throttle valve improves with a heat-resistant layer.

  In order to achieve the above object, the invention according to claim 5 is the invention according to any one of claims 2 to 4, wherein the heat-resistant layer is vapor phase plating.

  According to the structure of the said invention, in addition to the effect | action of the invention in any one of Claim 2 thru | or 4, it becomes possible to form a thin film | membrane by vapor phase plating about a heat-resistant layer.

  In order to achieve the above object, the invention according to claim 6 is the invention according to any one of claims 2 to 4, wherein the heat-resistant layer is electroless plating.

  According to the structure of the said invention, in addition to the effect | action of the invention in any one of Claim 2 thru | or 4, it becomes possible to form a thin film | membrane by electroless plating about a heat resistant layer.

  In order to achieve the above object, the invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein a throttle shaft that rotatably supports the resin throttle valve with respect to the body; A seal member provided on the throttle shaft for sealing between the throttle shaft, the resin throttle valve, and the body is further provided, and a heat-resistant layer is provided on the surface of the seal member.

  According to the structure of the said invention, in addition to the effect | action of the invention in any one of Claims 1 thru | or 6, the heat resistance of the surface of a sealing member improves with a heat resistant layer.

  In order to achieve the above object, an invention according to claim 8 includes a body including a bore, a resin throttle valve that opens and closes the bore, and a throttle shaft that rotatably supports the resin throttle valve with respect to the body. In addition, in the throttle body including the seal member provided on the throttle shaft and sealing between the throttle shaft, the resin throttle valve, and the body, the heat resistant layer is provided on the surface of the seal member.

  According to the structure of the said invention, the heat resistance of the surface of a sealing member improves with a heat resistant layer.

  In order to achieve the above object, the invention according to claim 9 is the invention according to claim 7 or 8, wherein the heat-resistant layer of the seal member is vapor phase plating.

  According to the structure of the said invention, in addition to the effect | action of the invention of Claim 7 or 8, it becomes possible to form a thin film | membrane by vapor phase plating about the heat resistant layer of a sealing member.

  In order to achieve the above object, the invention described in claim 10 is a resin throttle valve used to open and close the bore of the throttle body, and is provided with a heat-resistant material on at least the outer peripheral surface. And

  According to the configuration of the invention, the heat resistance of at least the outer peripheral surface of the resin throttle valve is improved by the heat resistant material.

  In order to achieve the above object, the invention according to claim 11 is the invention according to claim 10, wherein the heat-resistant material is a heat-resistant layer made of plating.

  According to the structure of the said invention, in addition to the effect | action of the invention of Claim 10, thin film formation is attained by plating about a heat resistant layer.

  According to the first aspect of the present invention, it is possible to prevent the resin throttle valve from being melted by a backfire or the like, and to ensure good operation of the resin throttle valve.

  According to the second aspect of the present invention, it is possible to prevent the resin throttle valve from being melted by a backfire or the like, and to ensure a good operation of the resin throttle valve.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, it is possible to prevent melting damage on the entire surface of the resin throttle valve, further improving the reliability of the resin throttle valve. Can be made.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 2, since it takes only a small area to provide the heat-resistant layer, it is possible to reduce manufacturing effort and cost.

  According to the invention described in claim 5, in addition to the effects of the invention described in any one of claims 2 to 4, bulkiness and weight increase due to the heat-resistant layer can be prevented.

  According to the invention described in claim 6, in addition to the effects of the invention described in any one of claims 2 to 4, bulkiness and weight increase due to the heat-resistant layer can be prevented.

  According to the invention described in claim 7, in addition to the effects of the invention described in any one of claims 1 to 6, the sealing member can be prevented from being melted by a backfire or the like, and the resin throttle valve is good. Safe operation can be further ensured.

  According to the invention described in claim 8, it is possible to prevent the sealing member from being melted by a backfire or the like, and to ensure a good operation of the resin throttle valve.

  According to the invention described in claim 9, in addition to the effects of the invention described in claim 7 or 8, bulkiness and weight increase due to the heat-resistant layer of the seal member can be prevented.

  According to the tenth aspect of the present invention, it is possible to prevent melting damage due to the backfire while being used in the throttle body, and it is possible to ensure good operation as a resin throttle valve.

  According to the eleventh aspect, in addition to the effect of the tenth aspect, bulkiness and weight increase due to the heat-resistant layer can be prevented.

[First Embodiment]
Hereinafter, a first embodiment in which a throttle body and a resin throttle valve of the present invention are embodied will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view showing an electronically controlled throttle device 1 including a throttle body according to the present embodiment. The throttle device 1 includes a throttle body 2, a DC motor 3, a speed reduction mechanism 4, and an opener mechanism 7 as main components. The throttle body 2 includes a resin body 7 including a bore 6, a metal throttle shaft 8, and a resin throttle valve 9.

  In this embodiment, the throttle device 1 is mounted in an intake passage (not shown) of the engine, and the bore 6 of the body 7 communicates with the intake passage in the mounted state. One side (right side in FIG. 1) of the body 7 is opened, and the opening is closed by a resin end frame 10. The throttle shaft 8 and the throttle valve 9 are accommodated in and supported by the body 7. That is, the throttle shaft 8 is disposed through the bore 6, and both ends thereof are rotatably supported by the body 7 via the bearings 11 and 12. The throttle valve 9 is integrally formed on the throttle shaft 8 and is disposed in the bore 6. That is, the throttle valve 9 is provided to be rotatable with respect to the body 7 via the throttle shaft 8 in order to open and close the bore 6. The throttle shaft 8 is insert-molded with respect to the valve 9 when the throttle valve 9 is molded with resin.

  A throttle gear 13 is fixed to one end of the throttle shaft 8. A return spring 14 for biasing the throttle valve 9 in the closing direction is provided between the throttle gear 13 and the body 7. The return spring 14 is one element constituting the opener mechanism 5.

  In this embodiment, the DC motor 3 is housed and fixed in the body 7. The DC motor 3 is drivingly connected to the throttle shaft 8 via the speed reduction mechanism 4 in order to drive the throttle valve 9 in the opening direction. That is, the motor gear 15 is fixed on the output shaft 3 a of the DC motor 3. A motor gear 15 is connected to the throttle gear 13 via an intermediate gear 16. The intermediate gear 16 is a two-stage gear in which a large-diameter gear 16 a and a small-diameter gear 16 b are integrated, and is rotatably supported by the body 7 via a pin shaft 17. The motor gear 15 is connected to the large diameter gear 16a, and the throttle gear 13 is connected to the small diameter gear 16b.

  Therefore, as shown in FIG. 1, from the fully closed state of the throttle valve 4, the DC motor 3 is actuated by energization, the output shaft 3a rotates in the forward direction, and the motor gear 15 rotates. The speed is reduced by 16 and transmitted to the throttle gear 13. As a result, the throttle shaft 8 and the throttle valve 9 are rotated against the urging force of the return spring 14, and the bore 6 is opened. That is, the throttle valve 9 is opened. Further, in order to maintain the throttle valve 9 at a certain opening, a rotational force is generated by energizing the DC motor 3 so that the rotational force is retained as a holding force via the motor gear 15, the intermediate gear 16 and the throttle gear 13. 8 and the throttle valve 9. When this holding force is balanced with the urging force of the return spring 14, the throttle valve 9 is held at a certain opening.

  Here, the resin throttle valve 9 will be described in detail. FIG. 2 is a front view of the throttle shaft 8 and the throttle valve 9. FIG. 3 is a plan view showing the throttle shaft 8 and the throttle valve 9. FIG. 4 shows a right side view of FIG. FIG. 5 is a sectional view taken along line AA in FIG.

  In this embodiment, as shown by meshes in FIGS. 1 to 3, a heat resistant layer 21 as a heat resistant material of the present invention is provided on the outer peripheral surface of the throttle valve 9. In this embodiment, the heat-resistant layer 21 is vapor phase plating, and a DLC film is employed as the vapor phase plating. “DLC” is “diamond-like carbon”, which is an amorphous hydrocarbon or one of allotropes of carbon. The DLC is usually generated as a film having a thickness of several microns (μm) on the metal surface. In this embodiment, the DLC is generated on the surface of the throttle valve 9 made of resin. This film is very smooth and very hard. The DLC is generally used in a field where low friction and low wear are required. In this embodiment, the surface of the throttle valve 9 made of resin is protected from high-temperature and high-pressure combustion gas and flame caused by the backfire. Therefore, it is used as the heat-resistant layer 21. In this embodiment, the thickness of the heat-resistant layer 21 is set to “2 to 3 μm”. The DLC constituting the heat resistant layer 21 is mixed with silicon or tungsten in order to further improve the heat resistance. In this embodiment, in order to generate a DLC film on the outer peripheral surface of the throttle valve 9 by vapor phase plating, sputtering, an ion beam plasma process, or the like is employed. In this embodiment, in order to make it easy to generate a DLC film on the outer peripheral surface of the throttle valve 9, the outer peripheral portion of the valve 9 is formed of a conductive resin.

  As shown in FIGS. 4 and 5, the throttle valve 9 has a tapered cross section that gradually decreases in thickness from the shaft 8 toward the outer end in a direction orthogonal to the throttle shaft 8. That is, the throttle valve 9 has a cross section in which both side surfaces are inclined symmetrically from the throttle shaft 8 toward the outer end. The reason why the throttle valve 9 has such a cross-sectional shape is to make the air flow smooth when the valve 9 is opened. Therefore, in the throttle valve 9 of this embodiment, the outer peripheral portion has the smallest thickness and the heat capacity is smaller than the other portions. The heat-resistant layer 21 is provided on the outer peripheral surface.

  According to the throttle body 2 of this embodiment described above, since the heat resistant layer 21 is provided on the outer peripheral surface of the resin throttle valve 9, the heat resistance of the outer peripheral surface of the valve 9 is improved by the heat resistant layer 21. . Here, the thickness of the heat-resistant layer 21 is “2 to 3 μm”, which is extremely thin. However, the high-temperature and high-pressure combustion gas or flame caused by the backfire only hits the outer periphery of the throttle valve 9 instantaneously, so that the thin heat-resistant layer 21 Even if it is 21, sufficient heat resistance can be ensured. In this embodiment, for example, heat resistance of about “300 to 600 ° C.” can be obtained. As a result, it is possible to prevent the resin throttle valve 9 from being melted by a backfire or the like, to improve the durability of the resin throttle valve 9, and to ensure good operation in the throttle body 2. Can do.

  In other words, since the outer periphery of the throttle valve 9 can be prevented from being melted, even when the throttle valve 9 is fully closed, no extra gap is generated between the valve 9 and the inner wall of the bore 6. , Idle driving malfunction can be prevented. In addition, since the outer peripheral portion of the throttle valve 9 does not interfere with the inner wall of the bore 6 due to deformation due to melting damage, the valve 9 does not malfunction such as a stick or does not fully close. Furthermore, since the throttle valve 9 can be prevented from being melted, the throttle valve 9 can be used for a long time without repair and replacement.

  In this embodiment, since the heat resistant layer 21 is vapor phase plating, an extremely thin film can be formed as the heat resistant layer 21. For this reason, the throttle valve 9 can be prevented from being bulky and increased in weight by the heat-resistant layer 21. Further, since the heat-resistant layer 21 itself is a very thin film, it does not affect the air flow on the surface of the throttle valve 9 and does not hinder the weight reduction of the resin throttle valve 9. .

  Further, in this embodiment, since the heat resistant layer 21 is only provided on the outer peripheral portion of the throttle valve 9, the amount of DLC film material constituting the heat resistant layer 21 can be relatively reduced. Further, since the heat-resistant layer 21 can be provided with a relatively small area, it is possible to reduce manufacturing effort and cost.

[Second Embodiment]
Next, a second embodiment in which the throttle body and the resin throttle valve of the present invention are embodied will be described in detail with reference to the drawings.

  FIG. 6 is a front view of the throttle shaft 8 and the throttle valve 9. FIG. 7 is a sectional view taken along line BB in FIG. This embodiment is different from the first embodiment in that the metal wire 22 is embedded in the outer periphery of the resin throttle valve 9. This metal wire 22 is insert-molded with respect to the valve 9 when the throttle valve 9 is resin-molded. The metal wire 22 is provided on the outer peripheral surface of the throttle valve 9 so as to function as an electrode in order to easily generate a DLC film that becomes the heat-resistant layer 21.

  Therefore, in this embodiment as well, since the heat-resistant layer 21 is provided on the outer peripheral surface of the throttle valve 9, the same effect as that of the first embodiment can be obtained.

[Third Embodiment]
Next, a third embodiment in which the throttle body and the resin throttle valve of the present invention are embodied will be described in detail with reference to the drawings.

  FIG. 8 is a front view of the throttle shaft 8 and the throttle valve 9. This embodiment is different from the above embodiments in that the heat-resistant layer 21 is provided on the entire surface of the resin throttle valve 9.

  Therefore, in this embodiment, since the heat resistant layer 21 is provided on the entire surface of the throttle valve 9, the heat resistance of the entire surface of the throttle valve 9 is improved by the heat resistant layer 21. As a result, the resin throttle valve 9 can be prevented from being melted by the backfire and the like, and the durability of the resin throttle valve 9 can be improved. Can be secured. In particular, in this embodiment, since not only the outer peripheral portion of the resin throttle valve 9 but also the entire surface of the valve 9 can be prevented from being melted, the reliability of the resin throttle valve 9 is further improved. be able to.

[Fourth Embodiment]
Next, a fourth embodiment in which the throttle body and the resin throttle valve of the present invention are embodied will be described in detail with reference to the drawings.

  FIG. 9 is a front view of the throttle shaft 8 and the throttle valve 9. FIG. 10 is a cross-sectional view taken along the line CC of FIG. This embodiment is different from the above embodiments in the configuration of the resin throttle valve 9. That is, in this embodiment, the heat-resistant cover 23 made of a metal plate as a heat-resistant material is provided integrally and flush with the surface layer of the outer peripheral portion of the throttle valve 9. The heat-resistant cover 23 has the same outer shape as the outer peripheral portion of the throttle valve 9 and is insert-molded with respect to the valve 9 when the throttle valve 9 is resin-molded.

  Therefore, also in this embodiment, since the heat resistant cover 23 is provided on the outer peripheral surface of the throttle valve 9, the heat resistance of the outer peripheral portion of the throttle valve 9 is improved by the heat resistant cover 23. As a result, the resin throttle valve 9 can be prevented from being melted by the backfire and the like, and the durability of the resin throttle valve 9 can be improved. Can be secured.

  Further, in this embodiment, since the heat-resistant cover 23 is only provided on the outer peripheral portion of the throttle valve 9, the weight reduction of the resin throttle valve 9 is not hindered. Further, since the heat-resistant cover 23 is provided flush with the surface of the throttle valve 9, the heat-resistant cover 23 does not affect the air flow on the surface of the throttle valve 9.

[Fifth Embodiment]
Next, a fifth embodiment in which the throttle body of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 11 is a sectional view showing an electronically controlled throttle device 31 including the throttle body of the present embodiment. FIG. 12 shows an enlarged view of the inside of the chain line circle S1 in FIG. This embodiment differs from the first embodiment mainly in that a seal member 32 is provided adjacent to the bearings 11 and 12 on the throttle shaft 8. Other configurations are basically the same as those of the first embodiment.

  That is, in this embodiment, the shape of both ends of the throttle shaft 8 and the shapes of the bearings 11 and 12 are slightly different from those of the first embodiment, and the bearings 11 and 12 have a simple annular shape. The seal member 32 is provided on the throttle shaft 8 so as to seal between the bearings 11 and 12, the throttle valve 9, the throttle shaft 8, and the body 7. The seal member 32 is made of an elastic material such as rubber and has a special shape such as a K-shaped cross section. Further, the seal member 32 is compressed between the end face of the throttle valve 9 and the end faces of the bearings 11 and 12 in the thrust direction. In the radial direction, the outer periphery of the seal member 32 is press-fitted into the body 7, and the inner periphery of the seal member 32 is slidable with respect to the throttle shaft 8.

  Here, as indicated by a broken line in FIG. 12, a heat-resistant layer 33 is provided on a part of the surface of the seal member 32 and exposed in the bore 6. In this embodiment, the heat-resistant layer 33 is vapor phase plating, and a DLC film is employed as the vapor phase plating. The DLC is generally used in a field where low friction and low wear are required. In this embodiment, the surface of the sealing member 32 made of an elastic material is protected from high-temperature and high-pressure combustion gas and flame caused by a backfire. Therefore, it is used as the heat-resistant layer 33. In this embodiment, the thickness of the heat-resistant layer 33 is set to “2 to 3 μm”. The DLC constituting the heat-resistant layer 33 is mixed with silicon or tungsten in order to further improve the heat resistance. In this embodiment, in order to generate a DLC film on the surface of the seal member 32 by vapor phase plating, sputtering, an ion beam plasma process, or the like is employed.

  Therefore, in this embodiment, since the heat resistant layer 33 is provided on the surface of the seal member 32, the heat resistance of the surface of the seal member 32 is improved by the heat resistant layer 33. As a result, it is possible to prevent the sealing member 32 from being melted by a backfire or the like, to improve the durability of the sealing member 32, and to secure a good sealing function when used in the throttle body 2. . Further, since the sealing member 32 can be prevented from being melted, even if the throttle valve 9 is fully closed, there is no unexpected gap between the valve 9, the throttle shaft 8, and the body 7. Good operation can be secured, and idling operation failure due to an increase in the air flow rate can be prevented. Other functions and effects are basically the same as those of the first embodiment.

  The present invention is not limited to the embodiments described above, and can be implemented as follows by appropriately changing a part of the configuration without departing from the spirit of the invention.

  (1) For example, in the said 1st-3rd embodiment, although the heat-resistant layer 21 was comprised by the DLC film by vapor phase plating, this heat-resistant layer can also be comprised by electroless plating (Ni-P). . In this case, since the heat-resistant layer is electroless plating, an extremely thin film can be formed. For this reason, the throttle valve can prevent bulkiness and weight increase due to the heat-resistant layer.

  (2) Instead of forming the heat-resistant layer 21 on the surface of the throttle valve 9 by vapor phase plating or electroless plating, a heat-resistant material is applied, a heat-resistant material is deposited, or the heat-resistant material is sprayed. Thus, a heat-resistant layer can be formed on the surface of the throttle valve.

  (3) In each of the embodiments, the heat-resistant layer 21 and the heat-resistant cover 23 are provided only on the resin throttle valve 9, but a heat-resistant layer or a heat-resistant cover may be provided on the bore inner wall of the body as a precaution.

  (4) In each of the embodiments described above, the resin body 7 is used, but a metal (for example, aluminum) body can also be used.

  (5) In the fifth embodiment, the heat-resistant layer 33 is provided on a part of the surface of the seal member 32 and exposed in the bore 6, but the heat-resistant layer may be provided on the entire surface of the seal member.

  (6) In the fifth embodiment, the seal member 32 provided with the heat-resistant layer 33 is provided on the throttle shaft 8 with respect to the basic configuration of the first embodiment, but the basic configuration of the second to fourth embodiments. On the other hand, a seal member provided with a heat-resistant layer may be provided on the throttle shaft, or for a throttle device that does not provide a heat-resistant layer on the surface of the resin throttle valve, a seal member provided with a heat-resistant layer is provided on the throttle shaft. It can also be provided.

Sectional drawing which shows the electronically controlled throttle apparatus containing a throttle body. The front view which shows a throttle shaft and a throttle valve. The top view which shows a throttle shaft and a throttle valve. The right view of FIG. FIG. 3 is a sectional view taken along line AA in FIG. 2. The front view which shows a throttle shaft and a throttle valve. BB sectional drawing of FIG. The front view which shows a throttle shaft and a throttle valve. The front view which shows a throttle shaft and a throttle valve. CC sectional view taken on the line of FIG. Sectional drawing which shows the electronically controlled throttle apparatus containing a throttle body. The enlarged view which shows the inside of the chain line circle | round | yen of FIG.

Explanation of symbols

2 Throttle body 6 Bore 7 Body 9 Throttle valve 21 Heat resistant layer (heat resistant material)
23 Heat-resistant cover (heat-resistant material)
32 Seal member 33 Heat-resistant layer

Claims (11)

In a throttle body comprising a body including a bore and a resin throttle valve that opens and closes the bore,
A throttle body characterized in that a heat-resistant material is provided on at least the outer peripheral surface of the resin throttle valve. In a throttle body comprising a body including a bore and a resin throttle valve that opens and closes the bore,
A throttle body, wherein a heat-resistant layer is provided on a surface of the resin throttle valve. The throttle body according to claim 2, wherein the heat-resistant layer is provided on the entire surface of the resin throttle valve. The throttle body according to claim 2, wherein the heat-resistant layer is provided on the outer peripheral surface of the resin throttle valve. The throttle body according to any one of claims 2 to 4, wherein the heat-resistant layer is vapor-phase plating. The throttle body according to any one of claims 2 to 4, wherein the heat-resistant layer is electroless plating. A throttle shaft that rotatably supports the resin throttle valve with respect to the body; and a seal member that is provided on the throttle shaft and seals between the throttle shaft, the resin throttle valve, and the body; The throttle body according to claim 1, further comprising a heat-resistant layer provided on a surface of the seal member. A body including a bore; a resin throttle valve that opens and closes the bore; a throttle shaft that rotatably supports the resin throttle valve with respect to the body; and the throttle shaft provided on the throttle shaft; In a throttle body comprising a sealing member that seals between the resin throttle valve and the body,
A throttle body, wherein a heat-resistant layer is provided on a surface of the seal member. The throttle body according to claim 7 or 8, wherein the heat-resistant layer of the seal member is vapor phase plating. A resin throttle valve used for opening and closing a bore of a throttle body, wherein a heat resistant material is provided at least on the outer peripheral surface. The resin-made throttle valve according to claim 10, wherein the heat-resistant material is a heat-resistant layer made of plating.

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