JP2005282429A - Throttle body and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent nonsmooth rotation of a valve element caused by mold shrinkage to provide a good close-contact state between a predetermined outer face part surface of the valve element and an inner wall face or a bearing face of a main body. <P>SOLUTION: A throttle body 1 comprises: the main body 10 where a cylindrical intake passage 14 is formed; and the disc valve element 20 rotatably supported by a bearing part 12 to open/close the intake passage 14. A solid lubricant is coated on an outer face part surface of the valve element 20 of a clearance corresponding to a portion between the valve element 20 and the main body 10 or a bearing part 12 to form a solid lubrication layer 25. The valve element 20 is resin-molded while the valve element 20 is inserted into the main body 10, the solid lubrication layer 25 of the valve element 20 is stuck to the main body 10 or the main body 10 and bearing part 12 to be delaminated, the valve element 20 is brought into close-contact with the main body 10 or bearing part 12 and is rotated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a throttle body and a manufacturing method thereof. In particular, the present invention relates to a throttle body that forms part of an intake passage of an internal combustion engine and controls the amount of intake air, and a method of manufacturing the same.

  2. Description of the Related Art Conventionally, a throttle body (also referred to as an air flow control device or a throttle chamber) is provided with a body body in which a cylindrical intake passage is formed and a valve body that is rotatably provided in the body body and opens and closes the intake passage. )It has been known.

  A conventional throttle body is shown in FIGS. 10 is a cross-sectional view of the vicinity of a valve body of a conventional throttle body, FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10, FIG. 12 is a cross-sectional view taken along the line XII-XII in FIG. It is sectional drawing equivalent to FIG. 11 which shows the mode of FIG.

The throttle body 1 has a body main body 10 and a valve body 20. The resin body 10 has a hollow cylindrical shape and forms an intake passage 14 (see FIG. 11). The resin valve body 20 has a disk shape, is integrally formed by casting a metal shaft 30, and resin reinforcing ribs 22 are appropriately provided on both front and back surfaces of the valve body 20. . The valve body 20 rotates with the rotation of the shaft 30 supported by the bearing portion 12, thereby creating a gap between the outer peripheral surface 21 of the valve body 20 and the inner wall surface 11 of the body main body 10. The amount of intake air passing through the intake passage 14 is controlled.
When the valve body 20 is fully closed, the outer peripheral surface 21 of the valve body 20 can be brought into close contact with the inner wall surface 11 of the body body 10 as shown in FIGS. 10 and 11. Thereby, the controllability of the intake air amount in the intake passage 14 is improved.
As shown in FIG. 11, the valve body 20 is close to the opening direction (counterclockwise direction) of the valve body 20 with respect to a plane (cross section) whose disk plane is orthogonal to the axis of the intake passage 14. Are arranged so as to be fully closed at a predetermined angle. By this angle, the valve body 20 can be easily rotated in the opening direction.

Here, for the purpose of improving the close contact state of the intake passage 14 when the valve body 20 is fully closed, a method in which the outer peripheral surface 21 of the valve body 20 and the inner wall surface 11 of the body main body 10 are in close contact during resin molding is conventionally used. However, the resin molding has a problem in that molding shrinkage occurs due to subsequent resin curing.
In Patent Document 1, as a countermeasure for this, molding is performed by separating the molding space of the body body 10 and the molding space of the valve body 20 by a predetermined interval in anticipation of subsequent molding shrinkage during resin molding. The method of performing, or the method of making the molding shrinkage rate of the resin material used for shaping | molding of the body 10 smaller than the molding shrinkage rate of the resin material used for shaping | molding of the valve body 20 is taken.
JP 2000-210983 A

However, it is practically difficult to manage molding shrinkage such that the outer peripheral surface 21 of the valve body 20 is in close contact with the inner wall surface 11 of the body body 10 after molding shrinkage. There is a problem in that variation occurs and the intended close contact state cannot be obtained.
In particular, it is difficult to manage conditions under severe conditions for the purpose of bringing the outer peripheral surface 21 of the valve body 20 into close contact with the inner wall surface 11 of the body body 10 after molding shrinkage. For this reason, immediately after molding, even in a good close contact state as shown in FIG. 11, molding shrinkage (see arrow 40) as shown in FIG. There is a case where the inner wall 11 of the main body 10 is bitten.
Further, since the bearing portion 12 is integrated with the body body 10, the bearing portion 12 also moves in the direction of the arrow 40 shown in FIG. 12 due to molding shrinkage of the body body 10, and the bearing end surface 13 of the bearing portion 12. May press the bearing facing surface 24 of the valve body 20.
In any of the above cases, the valve body 20 cannot rotate smoothly and the throttle body 1 cannot perform its function.

  The present invention was devised in view of these points, and the problem to be solved by the present invention is to smoothly rotate the valve body by molding shrinkage without imposing severe molding conditions for countermeasures against resin molding shrinkage. The object is to prevent the failure and obtain a good tight contact state between a predetermined outer surface portion surface of the valve body and the inner wall surface or the bearing surface of the body body.

In order to solve the above problems, the present invention takes the following means.
The throttle body according to the first invention takes the following means. That is, a body body formed with a cylindrical intake passage, and a shaft is rotatably supported on a bearing portion provided in the body body, and is integrally attached to the shaft. A throttle body comprising a disc-shaped valve body that opens and closes, wherein the valve body is resin-molded and corresponds to a gap between the body body or a member integral with the body body in a fully closed state A solid lubricant is applied and fixed to a predetermined outer surface portion of the valve body to form a solid lubricant layer, and the body body is resin-molded by inserting the valve body, and the solid lubricant of the valve body is The fixed part is fixed to the body body or a member having an integral relationship with the body body, and the delamination is performed so that the valve body can be rotated at the solid lubricant part. Surface is formed, characterized in that the contact surface between the member with the delaminated release surface of the solid lubricant to the valve body and the main body or main body integrally related.
According to the first aspect of the present invention, even if the body shrinkage occurs by inserting the valve body and resin-molding the body body, the valve body side and the body body, or the member side that is in an integral relationship with the body body With the solid lubricant layer formed in (3), the valve body and the body main body or the member having an integral relationship with the body main body can be smoothly slid while being in close contact with each other.

The throttle body according to the second invention takes the following means. That is, in the throttle body according to the first aspect described above, the position where the solid lubricant is applied and fixed to the valve body is the outer peripheral surface of the valve body.
According to the second aspect of the invention, even if molding shrinkage of the body body occurs, the depth of the valve body biting into the inner wall surface of the body body is compensated by the thickness of the solid lubricating layer formed on the outer peripheral surface of the valve body. can do. Further, adhesion and lubricity at the contact portion between the outer peripheral surface of the valve body and the inner wall surface of the body body can be achieved.

The throttle body according to the third invention takes the following means. That is, in the throttle body according to the first aspect of the present invention, the position where the solid lubricant is applied and fixed to the valve body is a surface facing the bearing portion provided in the body body around the shaft of the valve body. It is a region.
According to the third aspect of the present invention, even when the valve body is sandwiched and pressed by the two bearing portions provided in the body body as the body body is molded and contracted, the bearing portion and the shaft around the shaft of the valve body Adhesiveness and lubricity can be achieved at the contact portion with the surface portion facing the bearing portion.

The method for manufacturing a throttle body according to the fourth invention takes the following means. That is, a manufacturing method for manufacturing a throttle body according to the first aspect of the present invention includes a step of resin-molding a valve body to make it integral with a shaft, and solid lubrication on a predetermined outer surface portion surface of the resin-molded valve body The step of applying and fixing the agent and the valve body to which the solid lubricant is applied and fixed are inserted, and the portion of the valve body to which the solid lubricant is fixed is fixed to the body body or a member having an integral relationship with the body body. And a step of resin-molding the throttle body in a state in which the valve body is made, and a step of delamination of the solid lubricant portions to form a peeled surface and turn the valve body into a rotatable state.
According to the fourth aspect of the invention, it is possible to manufacture a throttle body that smoothly slides while the valve body and the body main body or a member that is integral with the body main body are in close contact with each other.

The throttle body according to the fifth aspect of the invention takes the following means. That is, a body body formed with a cylindrical intake passage, and a shaft is rotatably supported on a bearing portion provided in the body body, and is integrally attached to the shaft. A disc-shaped valve body that opens and closes, wherein the valve body is resin-molded, and a solid lubricant is applied to an end surface on the valve body side of a bearing portion that is integrally fixed to the body body. A solid lubricating layer is formed by being fixed, and the body body is inserted and resin-molded in a state in which the valve body and a bearing portion having a solid lubricating layer formed on the end surface are assembled, and is formed on the end surface of the bearing portion. The formed solid lubricating layer is fixed to a part surface of the opposing valve body, and a delaminated surface is formed so that the valve body can be rotated at the solid lubricating layer part. The delaminated release surface of the lubricant valve body is characterized in that the sliding contact surface at the time of turning.
According to the fifth aspect of the present invention, even when the solid lubricant is applied and fixed to the end face of the bearing portion to form the solid lubricant layer, the sliding contact surface when the valve body rotates can be formed. it can.

The present invention can obtain the following effects by taking the above-mentioned means.
According to the first aspect of the present invention, it is possible to obtain a throttle body that can smoothly rotate while the valve body is in close contact with the inside of the intake passage without performing resin molding shrinkage management that strictly defines the mold and the resin material. it can.
Further, according to the second invention, even if molding shrinkage of the body occurs during resin molding, the valve body itself does not bite into the body.
According to the third invention, even if the molding shrinkage occurs, the smooth rotation of the valve body is not hindered.
Further, according to the fourth aspect of the invention, it is possible to easily manufacture a throttle body that can be smoothly rotated while the valve body is in close contact with the intake passage.
Further, according to the fifth aspect, even when the solid lubricant is applied and fixed to the end face of the bearing portion, the same effect as that of the third aspect can be obtained.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  Example 1 is shown in FIGS. 1 is a cross-sectional view of the throttle body according to the present embodiment in the vicinity of the valve body, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. 7 and FIG. 8 are views conceptually showing a state of delamination of the solid lubricant layer applied and fixed to the outer peripheral surface of the valve body and rotation of the valve body in the process of manufacturing the throttle body. In the said process, it is a figure which shows notionally the state until the solid lubrication layer apply | coated and fixed to the bearing opposing surface of the valve body is delaminated, and a valve body is rotated. In the present embodiment, members corresponding to those of the conventional structure shown in FIGS. 10 to 13 described above are denoted by the same reference numerals.

First, the structure of the throttle body according to this embodiment will be described with reference to FIGS.
The throttle body 1 has a resin body body 10 and a resin valve body 20, and FIGS. 1 to 3 show a case where the valve body 20 is in a fully closed position.
As shown in FIG. 2, the body body 10 has an inner wall surface 11 that forms a cylindrical intake passage 14 inside thereof. A solid lubricating layer 25 is formed on a predetermined portion in the circumferential direction of the inner wall surface 11 and on the outer peripheral surface 21 of the disc-shaped valve body 20. This solid lubricating layer 25 is formed by delamination, and is fixedly formed so as to be embedded in the valve body-side solid lubricating layer 25 a fixedly formed on the outer peripheral surface 21 of the valve body 20 and the inner wall surface 11 of the body body 10. The body main body side solid lubricating layer 25b is formed. The delamination surfaces 21 and 11 of the valve body side solid lubricating layer 25a and the body main body side solid lubricating layer 25b are in close contact to form a fully closed position.

  Further, as shown in FIG. 3, metal parts for rotatably disposing the valve body 20 in the intake passage 14 are disposed at opposite portions of the intake passage 14 in the diameter direction of the cross section. A bearing portion 12 is provided. A solid lubricating layer 25 is formed between the bearing portion 12 and an axial end portion 23 provided around the shaft 30 of the valve body 20. The solid lubricating layer 25 is formed by delamination, and the valve body side solid lubricating layer 25a fixed to the axial end portion 23 of the shaft 30 of the valve body 20 and the bearing side fixed to the bearing portion 12 are formed. It consists of a solid lubricating layer 25c. The delamination surfaces 24 and 13 of the valve body-side solid lubricant layer 25a and the bearing-side solid lubricant layer 25c serve as sliding surfaces to enable the valve body 20 to rotate smoothly.

  On the other hand, the disc-shaped valve body 20 is integrally formed by casting around the shaft 30 and is rotatably supported by a bearing portion 12 provided integrally with the body main body 10. At the time of the rotation, as shown in FIG. 3, the axial ends 23 corresponding to both ends in the rotation central axis direction of the valve body 20 are bearing facing surfaces having a valve body side solid lubricating layer 25a on the surface. 24 slides with the bearing end surface 13 provided on the bearing portion 12 of the body body 10. 2, when the valve body 20 is fully closed, the outer peripheral surface 21 having the valve body-side solid lubricant layer 25a on the surface is the body body 10 having the body body-side solid lubricant layer 25b on the surface. It contacts with the inner wall surface 11.

  As shown in FIG. 2, the valve body 20 has an inner wall surface 11 of the body 10 at a position rotated around the shaft 30 so as to form a predetermined angle in the opening direction (counterclockwise direction). It is arrange | positioned so that it may contact | abut and may be fully closed. Thereby, the valve body 20 can be easily rotated in the opening direction without being fixed to the inner wall surface 11 of the body main body 10. Further, in order to cause the rotation of the valve body 20 to be accompanied by the rotation of the shaft 30, in this embodiment, the shaft 30 has an oval cross section. Further, as shown in FIG. 1, a plurality of reinforcing ribs 22 are provided on the front and back surfaces of the valve body 20 so as to withstand the stress of the intake air flow passing through the intake passage 14. Are provided in parallel in a direction substantially parallel to the direction from the rotation central axis toward the outer peripheral surface 21.

  As described above, the solid lubricant layers 25a to 25c are formed on the outer peripheral surface 21 and the bearing facing surface 24 of the valve body 20, the inner wall surface 11 and the bearing end surface 13 of the body body 10, and the outer peripheral surface 21 of the valve body 20 is The abutting surface 24 of the valve body 20 abuts against the inner wall surface 11 of the body body 10 and slides with the bearing end surface 13 of the body body 10, and the abutment and sliding are each solid lubricant formed on each surface. It is through the layers 25a to 25c.

Here, the part in which each solid lubricating layer 25a-25c is formed is further explained in full detail based on FIGS.
First, as shown well in FIG. 1, the outer peripheral surface of the valve body 20, that is, the circumferential outer circumferential surface 21 and the axial end portion 23 having a substantially semicircular arc shape, have a substantially uniform predetermined thickness. A valve body-side solid lubricating layer 25a is provided.
Next, as well shown in FIG. 2, on the inner wall surface 11 of the body main body 10, the body main body-side solid lubricant layer 25 b is formed at a portion in the circumferential direction in contact with the outer peripheral surface 21 of the valve body 20. It is provided so as to be embedded in the inner wall surface 11. That is, in the inner wall surface 11 of the body 10, the contact part surface with the outer peripheral surface 21 of the valve body 20 and the other part surface are in substantially the same surface (inner wall surface 11). As well shown in FIG. 3, the bearing end surface 13 of the bearing portion 12 that is integral with the body body 10 has a ring around the shaft 30 that slides against the bearing facing surface 24 of the valve body 20. A similar bearing-side solid lubricating layer 25c is provided in the shape portion.
In this embodiment, molybdenum disulfide, which is well known and used as a molybdenum coat dry film lubricant, is used as the solid lubricant. This is a mixture of molybdenum disulfide particles in a paint-like solvent.

Next, a method for forming the solid lubricant layers 25a to 25c according to the present embodiment will be described together with the manufacturing process of the throttle body 1 with reference to FIGS.
The manufacturing process of the throttle body 1 consists of the following four processes.
The first step is a step of resin molding the valve body 20. That is, the metal shaft 30 is inserted into a predetermined valve mold (mold), and a resin material is injected into the mold to mold the valve body 20.

  The second step is a step of applying and fixing a fixed lubricant to the outer surface portion of the resin-molded valve body 20. That is, a paint-like solid lubricant is applied to the outer peripheral surface 21 and the axial end 23 of the valve body 20 to form a film-like solid lubricant layer 25. The application method is specifically brush or spray. At this time, the application surface may protrude from the outer surface portion of the valve body 20.

The third step is a step of inserting the valve body 20 on which the solid lubricating layer 25 is formed in the second step and molding the body main body 10 with a resin. That is, the valve body 20 is inserted into a body mold (mold) with the bearing portion 12 fitted to the shaft 30 integrated with the valve body 20, and a resin material is injected into the mold. Then, the body body 10 in which the bearing portion 12 is integrated is molded.
At this time, the outer peripheral surface 21 of the valve body 20 on which the solid lubricating layer 25 is formed in the second step bites into the inner wall surface 11 of the body main body 10 due to molding shrinkage that occurs as the curing of the body main body 10 proceeds (see FIG. 4). ). At the same time, the bearing end facing surface 24 of the valve body 20 is pressed by the bearing end surface 13 (see FIG. 5).

Here, the depth of biting will be described in detail below.
Although the above bite is mainly due to molding shrinkage of the body 10, it is necessary to accurately consider the thermal expansion of the valve body 20. That is, when the body 10 is molded by injecting the resin material, the valve body 20 molded in advance in the first step is inserted, but the valve body 20 expands due to molding heat during the body body 10 molding. . At this time, since the outer peripheral surface 20 of the valve body 20 in the expanded state is in contact with the inner wall surface 11 of the body body 10, when the body body 10 is cured and the body body 10 contracts, At the same time, the cooling of the valve body 20 proceeds and the valve body 20 returns from the expanded state to the original state. Therefore, in the radial direction in the cross section of the intake passage 14 (the direction of the arrow 40 in FIG. 13), the depth of the biting is substantially equal to the amount obtained by subtracting the expansion amount of the valve body 20 from the contraction amount of the body body 10.

Quantitatively, in the present embodiment in which the cross-sectional diameter of the intake passage 14 is 45 mm and the body body 10 and the valve body 20 are made of PPS (polyphenylene sulfide) resin, the shrinkage of the body body 10 is approximately 0.135 mm. The expansion amount of the outer peripheral surface 21 of the valve body 20 is approximately 0.1 mm. That is, the depth of biting into the inner wall surface 11 of the body main body 10 is approximately 0.035 mm. Therefore, if the thickness of the solid lubricant layer 25 is larger than 0.035 mm, the position of the outer peripheral surface 21 of the valve body 20 is located closer to the center axis of the intake passage 14 than the inner wall surface 11 of the body body 10 in FIG. . For this reason, the outer peripheral surface 21 of the valve body 20 does not directly bite into the inner wall surface 11 of the body main body 10.
Although the thickness of the solid lubricating layer 25 of this level can be achieved by applying a brush or a spray, if a larger thickness is required, it can be dealt with by applying twice.

  After the body body 10 is finally cured, the solid lubricant layer 25 is fixedly integrated with the valve body 20, the body body 10, and the bearing portion 12 of the body body 10 by the above biting and pressing. That is, the valve body 20 is in a state in which it cannot rotate. The state at this time is shown in FIGS.

A 4th process is a process which makes the valve body 20 which became non-rotatable the state which can be rotated.
That is, the solid lubricant layer 25 is delaminated to form the solid lubricant layers 25a to 25c as release surfaces. The solid lubricant in this example is a paint-like solvent in which molybdenum disulfide fine particles are mixed. However, since the molybdenum disulfide particles have delamination properties, even if the solvent is dried and solidified. When a light impact is applied, a release surface can be easily formed.

The situation at this time will be described with reference to FIGS. Here, FIG. 5A is a conceptual diagram showing how the outer peripheral surface 21 of the valve body 20 is formed as a peeling surface, FIG. 5B is an enlarged view thereof, and FIG. 8A is a bearing of the valve body 20. The conceptual diagram which shows a mode that the opposing surface 24 is formed as a peeling surface, FIG.8 (b) is the enlarged view.
As shown in FIG. 5 and FIG. 8, delamination occurs in the solid lubricant layer 25 that has been dried and solidified when an impact is applied, for example, by tapping the outer peripheral surface 21 of the valve body 20. In the valve body 20, the outer peripheral surface 21a (see FIG. 5B) before the solid lubricant 25 is applied (hereinafter referred to as “before application”) and the bearing facing surface 24a before application (see FIG. 8B). Then, the valve body-side solid lubricant layer 25a is formed, and the outer peripheral surface 21 (see FIG. 5B) and the bearing facing surface 24 (see FIG. 8B) appear as peeling surfaces. Further, in the body 10, the body main body-side solid lubricant layer 25 b is formed on the inner wall surface 11 a (see FIG. 5B) where the solid lubricant layer 25 applied to the outer peripheral surface 21 of the valve body 20 bites. As a result, the inner wall surface 11 newly appears as a peeling surface, and in the bearing portion 12 of the body body 10, a bearing-side solid lubricating layer 25c is formed on the original bearing end surface 13a (see FIG. 8B), and a new bearing end surface 13 ( FIG. 8B) appears as a peeled surface.

  Each of the surfaces 21, 24, 11, and 13 newly appearing as peeling surfaces is a surface having a minute undulation as shown in FIGS. 5B and 8B immediately after peeling. However, as shown in FIG. 6, the valve body 20 is rotated several times and the sliding surfaces 21, 24, 11, 13 are slid to each other, whereby each surface 21, 24, 11, 13 is slid. The minute undulations in the form of powder rub off and become a smooth contact surface. As a result, the outer peripheral surface 21 of the valve body 20 is in close contact with the inner wall surface 11 of the body main body 10 when fully closed, and the bearing facing surface 24 of the valve body 20 is in contact with the bearing end surface 13 of the bearing portion 12 of the body main body 10. It can be smoothly slid and rotated while in close contact with.

Example 2 is shown in FIG. FIG. 9 is a cross-sectional view corresponding to FIG. 5 of the throttle body according to the present embodiment. Since the present embodiment shows a modification example of the contact portion between the body body 10 and the valve body 20 according to the first embodiment, a duplicate description is omitted.
In the present embodiment, a portion that abuts on the outer peripheral surface 21 of the valve body 20 in the circumferential direction of the inner wall surface 11 of the body body 10 is slightly protruded toward the intake passage 14. Thus, even when the outer peripheral surface 21 of the valve body 20 bites into the inner wall surface 11 of the body main body 10 during molding shrinkage of the body main body 10 (corresponding to the third step in Example 1), FIG. As shown in b), the inner wall surface 11 a of the biting portion is in the same plane as the inner wall surface 11 of the other portion in the intake passage 14 or slightly in the plane near the valve body 20.

For example, in the first embodiment, when the molding shrinkage varies on the side where the molding shrinkage increases or the application of the solid lubricant varies on the side where the coating becomes thinner, the outer peripheral surface 21 of the valve body 20 shown in FIG. However, according to the present embodiment, the increase can be compensated not only by the solid lubricating layer 25 but also by the protrusion. Therefore, the possibility that the valve body 20 bites into the inner wall surface 11 of the body body 10 can be reduced, and the product failure rate can be reduced.

Example 3 is an example in which the location where the solid lubricant is applied in Example 1 is changed from the bearing facing surface 24 side of the valve body 20 to the bearing end surface 13 side of the bearing portion 12 that is in an integral relationship with the body body 10. is there. Therefore, the overlapping description and drawings are omitted.
Also in the present embodiment, the solid lubricant layer 25 is fixedly integrated with the valve body 20 and the bearing portion 12 of the body main body 10 caused by the hardening of the body main body 10 in the same manner as in the first embodiment. The same effect can be obtained. That is, the bearing facing surface 24 of the valve body 20 can slide and rotate smoothly while in close contact with the bearing end surface 13 of the bearing portion 12 of the body body 10.

Although the embodiments of the throttle body according to the present invention have been described above, the present invention can be implemented in various other forms.
For example, in the first embodiment, the case where the position where the solid lubricant is applied to the valve body 20 is both the outer peripheral surface 21 and the bearing facing surface 24 of the valve body 20 has been described. Application may be sufficient. Of course, when the present invention is applied to both positions as in the first embodiment, the intake air amount control is performed better.
In the present invention, tungsten disulfide, graphite, or a mixture thereof can be used as the solid lubricant in addition to molybdenum disulfide.
The bearing portion 12 and the shaft 30 are generally made of metal, but the present invention can be implemented even if they are made of resin.

It is a cross-sectional view of the vicinity of the valve body of the throttle body according to the first embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a figure which shows notionally a mode that the solid lubrication layer apply | coated and fixed to the outer peripheral surface of a valve body is biting into the inner wall surface of a body body in the process of manufacturing the throttle body which concerns on Example 1 of this invention. (a) It is a figure which shows notionally a mode that the solid lubricating layer apply | coated and fixed to the outer peripheral surface of a valve body is delaminated in the process of manufacturing the throttle body which concerns on Example 1 of this invention. (b) It is the enlarged view. In the process which manufactures the throttle body which concerns on Example 1 of this invention, it is a figure which shows notionally that a valve body is rotated after delamination of the solid lubrication layer apply | coated and fixed to the outer peripheral surface of a valve body. is there. In the process which manufactures the throttle body which concerns on Example 1 of this invention, a solid lubricating layer apply | coated and fixed to the bearing opposing surface of the valve body is shown notionally by the bearing end surface of the bearing part of a body main body. FIG. (a) It is a figure which shows notionally a mode that the solid lubrication layer apply | coated and fixed to the bearing opposing surface of a valve body is delaminated in the process of manufacturing the throttle body which concerns on Example 1 of this invention. (b) It is the enlarged view. (a) It is a figure which shows notionally a mode that the solid lubricating layer apply | coated and fixed to the outer peripheral surface of a valve body is delaminated in the process of manufacturing the throttle body which concerns on Example 2 of this invention. (b) It is the enlarged view. It is a cross-sectional view near the valve body of a conventional throttle body. It is the XI-XI sectional view taken on the line of FIG. It is the XII-XII sectional view taken on the line of FIG. It is sectional drawing equivalent to FIG. 11 which shows notionally the mode of the shaping | molding shrinkage | contraction of the body main body of the conventional throttle body.

Explanation of symbols

1 Throttle body 10 Body body 11 Inner wall (delamination surface)
11a Inner wall surface before solid lubricant layer formation 12 Bearing part 13 Bearing end surface (delamination surface)
13a Bearing end surface before solid lubricant layer formation 14 Intake passage 20 Valve body 21 Outer peripheral surface (delamination surface)
21a Peripheral surface before solid lubricant layer formation 22 Rib 23 Axial end 24 Bearing facing surface 25 Solid lubricant layer 25a Valve body side solid lubricant layer 25b Body body side solid lubricant layer 25c Bearing side solid lubricant layer 30 Shaft 40 Contraction direction

Claims (5)

A body having a cylindrical intake passage, and a shaft is rotatably supported on a bearing provided in the body, and is integrally attached to the shaft, and the intake passage is opened and closed by the rotation. A throttle body comprising a disc-shaped valve body,
The valve body is resin-molded, and a solid lubricant is applied to a predetermined outer surface portion surface of the valve body by an amount corresponding to a gap between the body body or a member integral with the body body in the fully closed state. Fixed to form a solid lubricant layer,
The body body is resin-molded by inserting the valve body, and the solid lubricant layer forming portion of the valve body is fixed to the body body or a member having an integral relationship with the body body. A peeling surface formed by delamination so as to make the valve body rotatable is formed,
A throttle body characterized in that the delaminated surface of the solid lubricating layer is a close contact surface between a valve body and a body main body or a member having an integral relationship with the body main body. The throttle body according to claim 1,
A throttle body characterized in that the position where the solid lubricant is applied and fixed to the valve body is the outer peripheral surface of the valve body. The throttle body according to claim 1,
A throttle body characterized in that a position where a solid lubricant is applied and fixed to the valve body is a surface portion facing a bearing portion provided in a body body around a shaft of the valve body. A manufacturing method for manufacturing the throttle body according to claim 1,
A step of resin molding the valve body to make it integral with the shaft;
Applying and fixing a solid lubricant to a predetermined outer surface portion of the resin-molded valve body; and
Insert the valve body to which the solid lubricant is applied and fixed, and then mold the throttle body in a state where the part where the solid lubricant of the valve body is fixed is fixed to the body or a member that is integral with the body. And a process of
A method of manufacturing a throttle body, comprising: delamination of the solid lubricant portions to form a peeling surface to make the valve body rotatable. A body having a cylindrical intake passage, and a shaft is rotatably supported on a bearing provided in the body, and is integrally attached to the shaft, and the intake passage is opened and closed by the rotation. A throttle body comprising a disc-shaped valve body,
The valve body is resin-molded, and a solid lubricant is applied and fixed to the end face on the valve body side of the bearing portion integrally fixed to the body body to form a solid lubricant layer,
The body body is inserted and resin-molded in a state where the valve body and a bearing portion having a solid lubricating layer formed on the end face are assembled, and the solid lubricating layer formed on the end face of the bearing portion is opposed to the valve body. A peeled surface is formed that is fixed to the body part surface and is delaminated so that the valve body can be rotated at the solid lubricant layer part,
A throttle body characterized in that the peeling surface of the solid lubricant delaminated is used as a sliding contact surface when the valve body rotates.

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