Air inlet control valve

Abstract

The utility model relates to an air inlet control valve. The present invention suppresses displacement of a throttle valve member with respect to a throttle shaft after being fastened by a fastening member. An intake control valve (10) is provided with a throttle shaft (20) having a slit hole (21), a throttle valve member (30) inserted into the slit hole, and a screw (40) for fastening the throttle valve member to the throttle shaft. The slit hole has two wall surfaces (21a) in surface contact with two plate surfaces (31) of the throttle valve member. The two plate surfaces of the throttle valve member have a contact surface portion (31a) in surface contact with the two wall surfaces and a non-contact surface portion (31b) not in surface contact with the two wall surfaces. The two wall surfaces are provided with shaft-side rough surface parts, and the surface roughness of the shaft-side rough surface parts is rougher than that of the outer peripheral surface (20b) of the throttle shaft. The two contact surface portions have a valve-side rough surface portion having a surface roughness that is rougher than that of the non-contact surface portion.

Description

Technical Field

[0001] The technology disclosed in this specification relates to intake control valves. Background Technology

[0002] Conventionally, for example, there is a valve device described in Patent Document 1. This valve device includes: a shaft having a radially penetrating slit hole; a flat valve member inserted into the slit hole; and a fastening member that fastens the valve member to the shaft.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-172544 Utility Model Content

[0006] Problems to be solved by utility models

[0007] In the valve device of Patent Document 1, to ensure a secure connection between the shaft and the valve component and to prevent displacement of the valve component due to stress caused by changes in the operating environment, a convex-concave unit (protrusion, recess, etc.) is formed in the overlapping area where the shaft and valve component face each other, which is engaged with the other by tightening screws. However, the formation of the convex-concave unit (protrusion, recess, etc.) is relatively difficult, making it hard to achieve low cost. In addition, the deviation of the protrusion (protrusion) engaging with the other is relatively large, resulting in inconsistent effectiveness in preventing valve component displacement. Furthermore, the assemblability is also reduced due to the protrusion.

[0008] The problem to be solved by the technology disclosed in this specification is to suppress the offset of the throttle valve component relative to the throttle shaft by using a structure different from that described in Patent Document 1.

[0009] Solution for solving the problem

[0010] To solve the above problems, the technology disclosed in this specification adopts the following technical solution.

[0011] The first technical solution is an intake control valve, comprising: a throttle shaft having a radially penetrating slit hole; a flat throttle valve member inserted into the slit hole; and a fastening member fastening the throttle valve member to the throttle shaft. The intake control valve is characterized in that, in the fastened state of the throttle shaft and the throttle valve member, the slit hole of the throttle shaft has two wall surfaces that make surface contact with two plate surfaces of the throttle valve member. The plate surface has a contact surface that makes surface contact with the two wall surfaces and a non-contact surface that does not make surface contact with the two wall surfaces. At least one of the two wall surfaces of the slit hole has an axially roughened surface that has a surface roughness that is rougher than the outer peripheral surface of the throttle shaft. And / or, the contact surface of at least one of the two plate surfaces of the throttle valve member has a valve-side roughened surface that has a surface roughness that is rougher than the non-contact surface of the plate surface.

[0012] According to the first technical solution, by utilizing the roughened surface on the shaft side and / or the roughened surface on the valve side, the coefficient of friction between the contact surfaces of the throttle shaft and the throttle valve component is increased, thereby increasing the offset load (holding force) of the throttle valve component. This suppresses the offset of the throttle valve component relative to the throttle shaft after it has been secured by the fastening member.

[0013] Effects of the utility model

[0014] According to the technology disclosed in this specification, it is possible to suppress the offset of the throttle valve component relative to the throttle shaft by using a structure different from that described in Patent Document 1. Attached Figure Description

[0015] Figure 1 This is a top view showing an intake control valve according to one embodiment.

[0016] Figure 2 yes Figure 1 Sectional view along line II-II.

[0017] Figure 3 yes Figure 2 Sectional view along line III-III.

[0018] Explanation of reference numerals in the attached figures

[0019] 10. Intake control valve; 20. Throttle valve shaft; 20b. Outer peripheral surface; 21. Slit orifice; 21a. Wall surface (rough surface on the axial side); 30. Throttle valve component; 31. Plate surface; 31a. Contact surface (rough surface on the valve side); 31b. Non-contact surface; 40. Screw (fastening component). Detailed Implementation

[0020] Hereinafter, an embodiment for implementing the technology disclosed in this specification will be described using the accompanying drawings. In this embodiment, an intake control valve for controlling the amount of intake air drawn into an internal combustion engine (engine) is illustrated. Figure 1 This is a top view showing the intake control valve. Figure 2 yes Figure 1 Sectional view along line II-II, Figure 3 yes Figure 2 A sectional view along line III-III. For ease of explanation, based on... Figure 1 The top view defines the orientation of front, back, left, and right, but does not limit the configuration direction of the intake control valve.

[0021] (Overview of intake control valve)

[0022] like Figure 1 As shown, the intake control valve 10 includes a throttle body 11. A vertically oriented (in the vertical direction) portion is formed in the throttle body 11. Figure 1 A hollow cylindrical hole 12 extends in a straight line along the paper (face to back direction). Intake air flowing from the air purifier side flows through the hole 12 toward the intake manifold side. The throttle body 11 is made of resin or metal.

[0023] like Figure 2 As shown, a cylindrical throttle shaft 20, which passes through the hole 12 in the left-right direction (radial direction), is rotatably supported on the throttle body 11. The throttle shaft 20 has a radial direction (in the left-right direction) Figure 2 A slit hole 21 extends through the paper (face to back direction). A flat throttle valve component 30 is inserted into the slit hole 21. The throttle valve component 30 has a circular or approximately circular front and back (two plate surfaces). The throttle valve component 30 is fastened and fixed to the throttle shaft 20 by screws 40. The throttle valve component 30 controls the amount of intake air flowing within the hole 12 by rotating integrally with the throttle shaft 20. The throttle shaft 20, the throttle valve component 30, and the screws 40 are made of metal.

[0024] (Mounting structure of throttle valve component 30 relative to throttle valve shaft 20)

[0025] like Figure 2 As shown, the length of the slit hole 21 in the longitudinal direction of the throttle shaft 20 is larger than the diameter 30d of the throttle valve component 30. The width of the slit hole 21 in the lateral direction is slightly larger than the plate thickness 30t of the throttle valve component 30. The slit hole 21 has two wall surfaces 21a formed by planes that are parallel to each other in the lateral direction. A pair of left and right screw mounting holes 22 orthogonal to the slit hole 21 are formed on the throttle shaft 20.

[0026] like Figure 3As shown, the throttle valve component 30 has two plate surfaces 31 formed by mutually parallel planes. When the throttle valve component 30 is inserted relative to the slit hole 21, the two plate surfaces 31 are almost flush with the two wall surfaces 21a of the slit hole 21. A pair of threaded through holes 32 are formed in the throttle valve component 30, corresponding to the two screw mounting holes 22 of the throttle valve shaft 20 (see reference). Figure 2 ).

[0027] The screw 40 is composed of a round-headed, small-threaded part with a cross-shaped hole. The screw 40 has a head 41 and a threaded shank 42. The screw 40 corresponds to the "fastening member" described in this specification. The screw mounting hole 22 of the throttle shaft 20 is located on one side of the slit hole 21 (in... Figure 3 The threaded through hole 22a is formed on the wall portion 20a (on the upper side) and the internally threaded hole 22b is formed on the wall portion 20a on the other side of the slit hole 21. The threaded through hole 22a has a hole diameter slightly larger than the diameter of the threaded shank portion 42 of the screw 40. At the outer end of the threaded through hole 22a (on the upper side), the threaded through hole 22a is formed. Figure 3 The upper end of the screw 40 has a countersunk hole 22c corresponding to the head 41 of the screw 40. The internal threaded hole 22b can thread and fasten the threaded shank 42 of the screw 40. In addition, the threaded through hole 32 of the throttle valve component 30 has a diameter larger than the shank diameter of the threaded shank 42 of the screw 40.

[0028] (Installation steps of throttle valve component 30 relative to throttle valve shaft 20)

[0029] After the throttle body 11 is rotatably supported on the throttle shaft 20, the throttle valve component 30 is inserted into the slit hole 21 of the throttle shaft 20. Next, the threaded shank 42 of the screw 40 is inserted with a gap into the threaded through hole 22a of the throttle shaft 20 and the threaded through hole 32 of the throttle valve component 30, and then tightened into the internal threaded hole 22b. Thus, the throttle valve component 30 is tightened and fixed to the throttle shaft 20. In this tightened state, the two wall surfaces 21a of the slit hole 21 make surface contact with the two plate surfaces 31 of the throttle valve component 30 through the deformation of the two wall portions 20a and / or one wall portion 20a. Furthermore, since there is a radial gap between the threaded through hole 32 of the throttle valve component 30 and the threaded shank 42 of the screw 40, there is a possibility that the throttle valve component 30 may shift due to stress caused by changes in the operating environment. This embodiment suppresses the offset of the throttle valve component 30 through the following structural features.

[0030] (Features of this embodiment)

[0031] like Figure 3As shown, with the throttle shaft 20 and the throttle valve component 30 fastened, the two wall surfaces 21a of the slit hole 21 of the throttle shaft 20 have axially roughened surfaces, which have a surface roughness (arithmetic mean roughness Ra) that is rougher than the outer peripheral surface 20b of the throttle shaft 20. In this embodiment, since the wall surface 21a is an axially roughened surface across the entire surface, the wall surface 21a is also referred to as the axially roughened surface 21a.

[0032] The throttle valve component 30 has two plate surfaces 31, each having a contact surface 31a that makes surface contact with the two wall surfaces 21a of the slit orifice 21 and a non-contact surface 31b that does not make surface contact with the two wall surfaces 21a. The contact surface 31a of the two plate surfaces 31 has a valve-side roughened surface, which has a surface roughness (arithmetic mean roughness Ra) that is rougher than the non-contact surface 31b of the plate surface 31. In this embodiment, since the contact surface 31a is a valve-side roughened surface across the entire surface, it is also referred to as the valve-side roughened surface 31a.

[0033] (Advantages of the characteristic structure of this embodiment)

[0034] According to this embodiment, by utilizing the axially roughened surface 21a and the valve-side roughened surface 31a, the coefficient of friction between the contact surfaces of the throttle shaft 20 and the throttle valve member 30 is increased, thereby increasing the offset load (holding force) of the throttle valve member 30. This suppresses the offset of the throttle valve member 30 relative to the throttle shaft 20 after it is tightened by the screw 40. Furthermore, unlike the interlocking convex and concave units (protrusions, recesses, etc.) in Patent Document 1, the axially roughened surface 21a and the valve-side roughened surface 31a are easier to form and can be cost-effective, eliminating undesirable conditions caused by protrusions (protrusions).

[0035] [Other Implementation Methods]

[0036] The technology disclosed in this specification is not limited to the embodiments described above and can be implemented in various other ways. For example, the throttle shaft 20 only needs to have an axially roughened surface on at least one of the two wall surfaces 21a of the slit hole 21. Furthermore, the axially roughened surface 21a is not limited to being provided on the entire surface of the wall surface 21a, but can also be provided partially. Similarly, the throttle valve member 30 only needs to have a valve-side roughened surface on the contact surface 31a of at least one of the two plate surfaces 31. Furthermore, the valve-side roughened surface 31a is not limited to being provided on the entire surface of the plate surface 31, but can also be provided partially. Furthermore, it is sufficient to provide at least one roughened surface, either the axially roughened surface 21a or the valve-side roughened surface 31a. Furthermore, the fastening member is not limited to the screw 40, but can also be a bolt and nut, or a combined threaded member consisting of an externally threaded member and an internally threaded member with a threaded hole, or a riveting member. Furthermore, the screw 40 is not limited to a small-headed round-headed member with a cross-shaped hole, but can also be other threaded members.

Claims

1. An intake control valve, comprising: a throttle shaft having a slit hole through in a radial direction; a flat plate-shaped throttle valve member inserted into the slit hole; and a fastening member that fastens the throttle valve member to the throttle shaft, characterized in that, in a fastened state of the throttle shaft and the throttle valve member, the slit hole of the throttle shaft has two wall surfaces that make surface contact with two plate surfaces of the throttle valve member, the two plate surfaces of the throttle valve member have a contact surface portion that makes surface contact with the two wall surfaces and a non-contact surface portion that does not make surface contact with the two wall surfaces, at least one of the two wall surfaces of the slit hole has a shaft-side rough surface portion having a surface roughness coarser than an outer peripheral surface of the throttle shaft, and / or the contact surface portion of at least one of the two plate surfaces of the throttle valve member has a valve-side rough surface portion having a surface roughness coarser than the non-contact surface portion of the plate surface.

2. The intake control valve according to claim 1, wherein the shaft-side rough surface portion of the at least one of the two wall surfaces of the slit hole has a surface roughness coarser than an outer peripheral surface of the throttle shaft, and the valve-side rough surface portion of the at least one of the two plate surfaces of the throttle valve member has a surface roughness coarser than the non-contact surface portion of the plate surface.

3. The intake control valve according to claim 1 or 2, wherein the shaft-side rough surface portion of the at least one of the two wall surfaces of the slit hole has a surface roughness coarser than an outer peripheral surface of the throttle shaft, and the valve-side rough surface portion of the at least one of the two plate surfaces of the throttle valve member has a surface roughness coarser than the non-contact surface portion of the plate surface.

4. The intake control valve according to any one of claims 1 to 3, wherein the shaft-side rough surface portion of the at least one of the two wall surfaces of the slit hole has a surface roughness coarser than an outer peripheral surface of the throttle shaft, and the valve-side rough surface portion of the at least one of the two plate surfaces of the throttle valve member has a surface roughness coarser than the non-contact surface portion of the plate surface.

5. The intake control valve according to any one of claims 1 to 4, wherein the shaft-side rough surface portion of the at least one of the two wall surfaces of the slit hole has a surface roughness coarser than an outer peripheral surface of the throttle shaft, and the valve-side rough surface portion of the at least one of the two plate surfaces of the throttle valve member has a surface roughness coarser than the non-contact surface portion of the plate surface. ​ ​

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