JP4593538B2 - Valve device, butterfly valve assembly method, and throttle body manufacturing method - Google Patents

Description

The present invention relates to a valve device , a method for assembling a butterfly valve, and a method for manufacturing a throttle body.

A conventional example will be described. In addition, FIG. 12 is explanatory drawing which shows a throttle body.
As shown in FIG. 12, the body 311 of the throttle body 310 is formed with a hollow cylindrical bore 312. A round rod-like throttle shaft 320 that traverses the bore 312 in the radial direction (left-right direction in FIG. 12) is rotatably supported by the body 311. The throttle shaft 320 has a valve insertion hole 321 penetrating in the radial direction. The valve insertion hole 321 is aligned with the flow direction of the intake air flowing through the bore 312 (for example, the flow direction from the upper side to the lower side in FIG. 12 is referred to as the flow direction of the intake air). In this state, a perfect circular throttle valve 330 is inserted into the valve insertion hole 321 of the throttle shaft 320 from the upstream side of the bore 312. The throttle valve 330 is fixed to the throttle shaft 320 by fastening a screw (not shown). In general, the throttle valve 330 is formed with an outer diameter 330d that is slightly smaller than the bore 312d of the bore 312 in response to a request to reduce the amount of intake air leakage when the throttle valve 330 is fully closed. ing. Such a throttle valve 330 is described in Patent Document 1, for example.

JP 2002-235562 A

According to the conventional example, when the throttle valve 330 is inserted into the valve insertion hole 321 of the throttle shaft 320, the throttle valve 330 is easily brought into contact with the inner wall surface 313 of the bore 312. Therefore, it is necessary to carefully insert the throttle valve 330 into the valve insertion hole 321 so as not to damage both end faces (left and right end faces in FIG. 12) of the throttle valve 330 and the inner wall surface 313 of the bore 312. There is a problem that the workability of assembling the throttle valve 330 to the throttle shaft 320 is deteriorated.
Moreover, in the thing of the said patent document 1, the assembly work property of the butterfly valve with respect to a valve shaft is made easy by providing a ditch | groove in the inner wall face of a flow path. However, the concave groove is not preferable because it provides resistance to the flow of fluid when the butterfly valve is opened and affects the flow rate characteristics.

The problem to be solved by the present invention is to provide a valve device including a butterfly valve, an assembling method of the butterfly valve, and a manufacturing method of a throttle body that can improve the assembling workability with respect to the valve shaft.

The above-described problems can be solved by a valve device, a butterfly valve assembly method, and a throttle body manufacturing method that have the structure described in the claims.
That is, according to the valve apparatus according to claim 1 of the appended claims, the butterfly valve is formed by essentially circular slightly smaller outer shape than the flow path of the flow path forming member, butterfly valve relative to the valve shaft By cutting both end portions of the mounting portion in a direction perpendicular to the rotation axis , planar end surface portions extending in a straight line are formed at both ends of the mounting portion. Therefore, the width in the rotation axis direction of the butterfly valve is shorter than the width in the rotation axis direction of the assumed shape. Thereby, the contact of the butterfly valve with the inner wall surface of the flow path of the flow path forming member when the butterfly valve is inserted into the valve insertion hole of the valve shaft supported by the flow path forming member can be prevented or reduced. As a result, the butterfly valve can be easily inserted into the valve insertion hole of the valve shaft, and the assembling workability of the butterfly valve with respect to the valve shaft supported by the flow path forming member can be improved. Furthermore, the influence on the flow rate characteristics when the butterfly valve is opened can be reduced as compared with a structure in which a concave groove is provided on the inner wall surface of the flow path (see, for example, Patent Document 1).

Further , the length of the planar end surface portion of the butterfly valve is set shorter than the shaft diameter of the valve shaft. Thereby, the amount of fluid leakage when the butterfly valve is fully closed can be reduced.

According to the butterfly valve assembling method of claim 2 , the valve insertion hole of the valve shaft supported by the flow path forming member is aligned with the flow direction of the flow path of the flow path forming member. A step of inserting a butterfly valve into the valve insertion hole from the upstream side or the downstream side in the flow direction of the flow path. Accordingly, the butterfly valve can be easily inserted into the valve insertion hole of the valve shaft supported by the flow path forming member, and the assembling workability of the butterfly valve with respect to the valve shaft can be improved.

According to the throttle body manufacturing method of the third aspect of the present invention, in the state in which the valve insertion hole of the throttle shaft supported by the body body is aligned with the flow direction of the intake passage of the body body, A step of inserting the throttle valve into the valve insertion hole from the upstream side or the downstream side in the flow direction of the passage. As a result, the throttle valve can be easily inserted into the valve insertion hole of the throttle shaft supported by the body body, and the workability of assembling the throttle valve to the throttle shaft can be improved.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

[Example 1]
A first embodiment of the present invention will be described with reference to the drawings. In this embodiment, a throttle body as a valve device including a butterfly valve is illustrated. First, the throttle body will be described. 1 is a plan view showing the throttle body, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, FIG. 3 is a cross-sectional view taken along line III in FIG. 1, and FIG. FIG.
As shown in FIGS. 1 and 2, the throttle body 10 includes a body 11 made of resin or metal. In the body 11, a hollow cylindrical bore 12 that extends straight in the vertical direction in FIG. 2 is formed. An air cleaner (not shown) is connected to the upstream side of the body 11, and an intake manifold (not shown) is connected to the downstream of the body 11. As a result, the intake air from the air cleaner flows through the bore 12 to the intake manifold. The throttle body 10 corresponds to a “valve device” in this specification. The body 11 corresponds to a “flow path forming member” in this specification. The bore 12 corresponds to “intake passage” and “flow passage” in the present specification. The intake air corresponds to “fluid” in the present specification.

  As shown in FIG. 2, a metal round bar-like throttle shaft 20 that crosses the bore 12 in the radial direction (left-right direction in FIG. 2) is rotatably supported by the body main body 11. A central portion of a circular throttle valve 30 is fastened to the throttle shaft 20 by a screw 40 composed of a headed screw (see FIGS. 1 and 4). Thereby, the throttle valve 30 is fixed to the throttle shaft 20. The throttle valve 30 rotates integrally with the throttle shaft 20 to open and close the bore 12 and control the amount of intake air flowing through the bore 12. The throttle valve 30 is in the closed state shown in FIGS. 1 and 2, and the bore 12 is opened by being rotated from this state. A structure for attaching the throttle valve 30 to the throttle shaft 20 will be described later. The throttle shaft 20 is rotated based on the driving of a motor (not shown) or the operation of an interlocking member such as a wire or a link mechanism that interlocks with an accelerator operation. The throttle shaft 20 corresponds to a “valve shaft” in the present specification. The throttle valve 30 corresponds to a “butterfly valve” in the present specification. The screw 40 corresponds to “attachment means” in this specification.

Next, a structure for attaching the throttle valve 30 to the throttle shaft 20 will be described. FIG. 5 is an exploded perspective view showing the throttle body.
As shown in FIG. 5, the throttle shaft 20 is formed with a slit-like valve insertion hole 21 penetrating in the radial direction. The valve insertion hole 21 is formed by a processing method such as drilling with a press, cutting with a broach, laser processing, electric discharge processing, or grinding. The throttle shaft 20 is formed with a pair of screw mounting holes 22 orthogonal to the valve insertion hole 21. As shown in FIG. 4, the screw mounting hole 22 includes a screw insertion hole 22 a formed on a wall portion on one side of the valve insertion hole 21 (upper side in FIG. 4) and the other side of the valve insertion hole 21 (FIG. 4). And the screw hole portion 22b is provided on the same axis.

  As shown in FIG. 5, the throttle valve 30 is basically formed into a perfect circle by punching a metal plate-like material with a press. In the throttle valve 30, a pair of screws that substantially correspond to the screw mounting holes 22 are inserted on a center line (hereinafter also referred to as a rotation axis) 30 </ b> L located on the same axis as the rotation axis 20 </ b> L of the throttle shaft 20. Each hole 32 is formed. The configuration of the throttle valve 30 will be described later.

Next, a procedure for attaching the throttle valve 30 to the throttle shaft 20 will be described. 6 is a sectional view for explaining the assembly of the throttle valve to the throttle shaft, FIG. 7 is a plan view of the same, and FIG. 8 is a sectional view showing a state in which the throttle valve is inserted into the valve insertion hole of the throttle shaft.
Prior to the installation of the throttle valve 30, the throttle shaft 20 is rotatably supported by the body body 11. A state in which the valve insertion hole 21 of the throttle shaft 20 is aligned with the flow direction of the intake air flowing through the bore 12 (for example, the flow direction from the top to the bottom in FIG. 6 is referred to as the flow direction of the intake air); That is, the valve insertion hole 21 is aligned with the axis 12 </ b> L of the bore 12. In this state, the throttle valve 30 is inserted into the valve insertion hole 21 along the axis 12L of the bore 12 from the upstream side of the bore 12 (see arrow in FIG. 6). Then, the rotation axis 30L of the throttle valve 30 is aligned with the same axis as the rotation axis 20L of the throttle shaft 20, and the screw insertion holes 32 are aligned with the screw mounting holes 22 (see FIG. 8). In this state, as shown in FIG. 4, the screw shaft portion 41 of the screw 40 is inserted from the screw insertion hole portion 22a of the screw mounting hole 22 of the throttle shaft 20 into the screw insertion hole 32 of the throttle valve 30, and further the screw mounting hole. Fastened to the female screw hole 22b. Thereby, the throttle valve 30 is fixed to the throttle shaft 20 by fastening the screw 40 (see FIGS. 1 and 2). A portion where the throttle valve 30 is attached to the throttle shaft 20 is referred to as an “attachment portion 33” (see FIGS. 4 and 5).

Next, the throttle valve 30 will be described. As shown in FIG. 6, the throttle valve 30 is a perfect circle having a constant thickness 30t (see FIG. 7) over the entire surface and basically having an outer diameter 30d slightly smaller than the diameter 12d of the bore 12. It is formed into a shape. Further, the outer diameter 30d with respect to the diameter 12d is set so as not to impair the operability for opening and closing the throttle valve 30 while reducing the amount of intake air leakage when the throttle valve 30 is fully closed.

  Thus, both end portions (left and right end portions in FIG. 6) of the mounting portion 33 of the throttle valve 30 are cut in a direction (vertical direction in FIG. 6) perpendicular to the rotation axis 30L, so that both ends of the mounting portion 33 are formed. A planar end surface portion 35 is formed (see FIG. 5). As shown in FIG. 3, the planar end surface portion 35 is formed in line symmetry (vertically symmetrical in FIG. 3) around the rotation axis 30 </ b> L of the throttle valve 30. In FIG. 3, the outer shape of a perfect circle before the throttle valve 30 is cut off is indicated by a two-dot chain line 34, and the cut portion is indicated by reference numeral 36.

As shown in FIG. 3, the length 35 </ b> S of the planar end surface portion 35 is set to be shorter than the shaft diameter 20 d of the throttle shaft 20. For example, the length 35S is set to about 3/5 to 4/5 of the shaft diameter 20d. Therefore, the width 30W of the throttle valve 30 in the direction of the rotation axis 30L (see FIG. 6) is the width in the direction of the rotation axis 30L in the shape of a perfect circle including the cut-out portion 36 (see FIG. 3) that is the premise. It is shorter than the diameter 30d.
As shown in FIG. 6, the throttle valve 30 is arranged from the upstream side in the flow direction of the bore 12 in a state where the valve insertion hole 21 of the throttle shaft 20 is aligned with the flow direction of the bore 12 of the body body 11. It is inserted into the insertion hole 21 (see FIG. 8). Thereafter, the throttle valve 30 is fixed to the throttle shaft 20 by fastening the screw 40 (see FIGS. 1 and 2).

According to the throttle body 10 described above, the throttle valve 30 is basically formed in a perfect circle shape slightly smaller than the bore 12 of the body main body 11, and both ends of the attachment portion 33 of the butterfly valve 30 with respect to the throttle shaft 20. By cutting the portion in a direction perpendicular to the rotation axis 30L, planar end surface portions 35 extending in a straight line are formed at both ends of the mounting portion 33 (see FIGS. 3 and 6). Therefore, the width 30W of the throttle valve 30 in the direction of the rotation axis 30L is shorter than the perfect circular outer diameter 30d. Thus, the throttle valve 30 (specifically, the plane of the mounting portion 33) with respect to the inner wall surface 13 of the bore 12 of the body main body 11 when the throttle valve 30 is inserted into the valve insertion hole 21 of the throttle shaft 20 supported by the body main body 11. Can be prevented or reduced. As a result, the throttle valve 30 can be easily inserted into the valve insertion hole 21 of the throttle shaft 20, and the workability of assembling the throttle valve 30 to the throttle shaft 20 supported by the body main body 11 can be improved. Furthermore, the influence on the flow rate characteristics when the throttle valve 30 is opened can be reduced as compared with a structure in which a concave groove is provided on the inner wall surface of the flow path (see, for example, Patent Document 1).

Further, the length 35S of the planar end surface portion 35 of the throttle valve 30 is set to be shorter than the shaft diameter 20d of the throttle shaft 20 (see FIG. 3). This reduces the amount of fluid leakage when the throttle valve 30 is fully closed, compared to the case where the length 35S of the planar end surface portion 35 of the throttle valve 30 is set longer than the shaft diameter 20d of the throttle shaft 20. be able to.

  Further, according to the method of assembling the throttle valve 30 described above, the throttle shaft 20 is throttled from the upstream side in the flow direction of the bore 12 with the valve insertion hole 21 of the throttle shaft 20 aligned with the flow direction of the bore 12 of the body body 11. A step of inserting the valve 30 into the valve insertion hole 21 is provided (see FIGS. 6 and 7). As a result, the throttle valve 30 can be easily inserted into the valve insertion hole 21 of the throttle shaft 20 supported by the body 11, and the workability of assembling the throttle valve 30 to the throttle shaft 20 can be improved. .

  In addition, according to the method for manufacturing the throttle body 10 described above, the throttle valve 20 from the upstream side of the flow direction of the bore 12 can be obtained with the valve insertion hole 21 of the throttle shaft 20 aligned with the flow direction of the bore 12 of the body body 11. 30 is inserted into the valve insertion hole 21 (see FIGS. 6 and 7). As a result, the throttle valve 30 can be easily inserted into the valve insertion hole 21 of the throttle shaft 20 supported by the body 11, and the workability of assembling the throttle valve 30 to the throttle shaft 20 can be improved. .

[Example 2]
A second embodiment of the present invention will be described. Since the present embodiment is obtained by changing a part of the first embodiment, the changed portion will be described, and redundant description will be omitted. Also, in the following embodiments, the changed parts will be described, and redundant description will be omitted. FIG. 9 is a plan view showing the throttle body according to the second embodiment.
In this embodiment, as shown in FIG. 9, a hollow elliptical cylindrical bore 112 is formed in the body main body 11 of the throttle body 10. An elliptical throttle valve 130 that can be opened and closed by rotating the bore 112 is fixed to the throttle shaft 20 by fastening with a screw 40. The throttle valve 130 basically has an elliptical shape slightly smaller than the bore 112. Thus, a semicircular portion having a radius of 130 d is formed on both sides of the throttle valve 130. Then, in the throttle valve 130, both end portions of the mounting portion (reference numeral omitted) with respect to the throttle shaft 20 are cut or cut away in a direction perpendicular to the rotation axis 130L of the throttle valve 130, so that the mounting portion has the first embodiment. A planar end surface portion 135 similar to the planar end surface portion 35 is formed. In addition, it can be considered that the throttle valve 30 in the first embodiment also has semicircular portions formed with a radius of 30d on both sides.
Therefore, also according to the present embodiment, the same operation and effect as those of the first embodiment can be obtained.

[Example 3]
A third embodiment of the present invention will be described. In the present embodiment, a part of the first embodiment is modified. FIG. 10 is a cross-sectional view showing the throttle body.
In this embodiment, as shown in FIG. 10, the throttle shaft 20 is rotatably supported via a bearing 50 with respect to the body main body 11. The bearing 50 forms a circular wall surface portion 15 orthogonal to the rotation axis 20L of the throttle shaft 20 on the inner wall surface 13 of the bore 12. As the bearing 50, a sliding bearing or a rolling bearing can be used. In the case of a sliding bearing, it is fixed to the body 11 and a circular wall surface 15 is formed by the end face on the bore 12 side. In the case of a rolling bearing, a circular wall surface portion 15 is formed by the end surface on the bore 12 side of the outer ring fixed to the body main body 11. The circular wall surface 15 is formed with an outer diameter 15d that is larger than the shaft diameter 20d of the throttle shaft 20.
The length 35S of the planar end surface portion 235 of the throttle valve 30 is set to be shorter than the shaft diameter 20d of the throttle shaft 20.
Therefore, also according to the present embodiment, the same operation and effect as those of the first embodiment can be obtained.

[Example 4]
Embodiment 4 of the present invention will be described. In the present embodiment, a part of the third embodiment is modified. FIG. 11 is a cross-sectional view showing the throttle body.
In the present embodiment, as shown in FIG. 11, the body 17 is integrally formed with a bearing portion 17 that rotatably supports the throttle shaft 20, and the throttle shaft 20 on the inner wall surface 13 of the bore 12 is formed on the bearing portion 17. A circular wall surface 18 perpendicular to the rotation axis 20L is formed. The circular wall surface portion 18 is formed with an outer diameter 18d larger than the shaft diameter 20d of the throttle shaft 20.
The length 35S of the planar end surface portion 35 of the throttle valve 30 is set to be shorter than the shaft diameter 20d of the throttle shaft 20 as in the third embodiment.
Therefore, also according to the present embodiment, the same actions and effects as those of the third embodiment can be obtained.

The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, in addition to the throttle body 10, the present invention can be applied as a valve device for controlling the flow rate of various fluids and a method for assembling a butterfly valve. In addition, the mounting means for fixing the throttle valve to the throttle shaft may employ, for example, rivets, welding, adhesion, or the like instead of the screw 40. The throttle shaft 20 can be made of resin instead of metal. The throttle valve 30 can be made of resin instead of metal. Further, when the throttle valve has a valve insertion hole along the bore flow direction, the throttle valve 30 can be inserted into the valve insertion hole 21 from the downstream side of the bore. In the above-described embodiment, the thickness 30t of the throttle valve 30 is constant. For example, the throttle valve 30 is gradually or gradually thinned from the mounting portion 33 side toward the free end side, or from the central portion in the width direction to the width direction. It can also be made thinner toward both ends.

It is a top view which shows the throttle body concerning Example 1 of this invention. It is the II-II sectional view taken on the line of FIG. It is sectional drawing of the III section of FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. It is a disassembled perspective view which shows a throttle body. It is sectional drawing concerning description of the assembly | attachment of the throttle valve with respect to a throttle shaft. It is a top view concerning explanation of the assembly of the throttle valve to the throttle shaft. It is sectional drawing which shows the state which inserted the throttle valve in the valve insertion hole of the throttle shaft. It is a top view which shows the throttle body concerning Example 2 of this invention. It is explanatory drawing which shows the bearing part of the throttle shaft concerning Example 3 of this invention. It is explanatory drawing which shows the bearing part of the throttle shaft concerning Example 4 of this invention. It is explanatory drawing which shows the throttle body concerning a prior art example.

Explanation of symbols

10 Throttle body (valve device)
11 Body body (channel forming member)
12 bore (intake passage, flow path)
14 Circular wall surface 20 Throttle shaft (valve shaft)
21 Valve insertion hole 30 Throttle valve (butterfly valve)
33 Mounting part 35 Planar end face part

Claims (3)

A flow path forming member that forms a hollow cylindrical flow path,
A valve shaft rotatably supported by the flow path forming member and crossing the flow path in the radial direction ;
It is attached to the valve shaft in a state of being inserted into a valve insertion hole penetrating in the radial direction of the valve shaft supported by the flow path forming member, and opens and closes the flow path by rotating integrally with the valve shaft. and a butterfly valve to
A valve device comprising :
The butterfly valve is basically formed in a circular shape with an outer shape slightly smaller than the flow path,
By cutting both end portions of the butterfly valve mounting portion with respect to the valve shaft in a direction perpendicular to the rotation axis, a planar end surface portion extending linearly at both ends of the mounting portion is formed ,
The valve device characterized in that the length of the planar end surface portion of the butterfly valve is set shorter than the shaft diameter of the valve shaft . A butterfly valve assembly method for assembling the butterfly valve of the valve device according to claim 1 to a valve shaft,
With the valve insertion hole of the valve shaft supported by the flow path forming member aligned with the flow direction of the flow path of the flow path forming member, the butterfly from the upstream or downstream side of the flow direction of the flow path A method for assembling a butterfly valve, comprising the step of inserting a valve into the valve insertion hole. A body body that is a flow path forming member that forms an intake passage as a flow path;
A throttle shaft that is a valve shaft rotatably supported by the body body;
A throttle body as a valve device according to claim 1 , comprising a throttle valve that is a butterfly valve attached in a state of being inserted into a valve insertion hole that penetrates the throttle shaft in a radial direction thereof,
With the valve insertion hole of the throttle shaft supported by the body body aligned with the flow direction of the intake passage of the body body, the throttle valve is moved from the upstream side or the downstream side in the flow direction of the intake passage. A method of manufacturing a throttle body, comprising a step of inserting into an insertion hole.

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