KR20060050617A - Throttle valve apparatus - Google Patents

Abstract

Improves the sealability of the throttle valve body and the throttle body.

The throttle valve device has a throttle valve body 10 and a throttle body 8 for housing the throttle valve body 10. The throttle valve body 10 consists of the shaft part 12 and the valve part 11. The valve part 11 has the elastic part 21 added to the valve part 11 by double shaping | molding. The elastic part 21 extends to the axial part 12, and the circumferential edge of this extension part is formed in wave shape in order to make adhesiveness with the throttle body 8 favorable. The shaft portion 12 has a large diameter portion 13 having a larger dimension than the valve portion 11 and a small diameter portion 14 having a small dimension.

Description

Throttle Valve Device {THROTTLE VALVE APPARATUS}

1 is a cross-sectional view of a throttle valve device according to an embodiment of the present invention,

2 is a cross-sectional view of an intake system including a throttle valve device according to an embodiment of the present invention;

3 is a side view of a throttle valve device according to an embodiment of the present invention;

4 is a perspective view of the throttle valve body 10,

5 is an explanatory diagram showing a molding method of a throttle valve body and an elastic portion;

6 is an explanatory diagram showing a molding method of a throttle valve body and an elastic portion;

7 is an explanatory diagram showing a molding method of a throttle valve body and an elastic portion;

8 is an explanatory diagram showing a molding method of a throttle valve body and an elastic portion;

9 is an explanatory diagram showing a molding method of a throttle valve body and an elastic portion;

10 is an explanatory diagram showing a molding method of a throttle valve body and an elastic portion;

11 is a cross-sectional view showing the engaging portion of the valve portion and the throttle body;

12 is a cross-sectional view showing the engaging portion of the elastic portion and the throttle body;

13 is a perspective view of the valve portion excluding the elastic portion,

14 is a cross-sectional view of a conventional apparatus showing an example of seal incompleteness due to an angular tolerance of a throttle body and a butterfly valve portion;

15 is a cross-sectional view of a conventional apparatus showing an example of seal incompleteness due to axial length tolerances of the throttle body and the throttle valve body.

<Description of Symbols for Main Parts of Drawings>

1: cylinder head 2: intake port

4: intake pipe 7: air cleaner case

8: throttle body 10: throttle body body

11 valve part 12 shaft part

13: large diameter portion 14: small diameter portion

15 sleeve 21 elastic portion

TECHNICAL FIELD The present invention relates to a throttle valve device, and more particularly, to a throttle valve device having a structure suitable for improving seal performance.

A throttle valve device is mounted on the carburettor or electronic fuel injection device to control the output of the internal combustion engine by adjusting the amount of the mixer sucked into the combustion chamber of the internal combustion engine. In the throttle valve device, for example, as described in Japanese Patent Application Laid-Open No. 3-112542, a butterfly-type throttle valve body is axially supported in a throttle chamber or a throttle body, and the valve body is rotated to open the valve. Adjust This throttle valve device comprises the throttle body with resin. Japanese Unexamined Patent Publication No. 4-134643 discloses a throttle valve device in which a resin coating or a resin tape is attached to a valve surface in order to prevent freezing of moisture adhering to the throttle valve.

(Patent Document 1) Japanese Unexamined Patent Publication No. 3-112542

(Patent Document 2) Japanese Unexamined Patent Publication No. 4-134643

The conventional throttle valve body is divided into a butterfly valve part and a shaft part, and these are integrally assembled by a method such as a screw or a caulking. Since the butterfly valve portion and the shaft portion are divided in this way, there is a problem that the number of assembling steps increases. In addition, the seal performance may become uneven due to the deviation of the dimensional tolerance between the throttle valve main body and the throttle body at the time of full closing of the valve, and the air flow rate adjustment may be necessary after assembly.

14 is a cross-sectional view of the prior art showing an example of variation in seal performance due to angular tolerances of the throttle body and the butterfly valve portion. The butterfly valve part 100 is configured to secure the seal in contact with the step 120 of the throttle body 110. However, as can be understood from this figure, the gap 130 is caused by the deviation of the step 120 of the throttle body 110 even though the butterfly valve part 100 is rotated to a predetermined totally closed position. .

15 is a cross-sectional view of the prior art showing an example of variation in seal performance due to axial length tolerances of the throttle body and the throttle valve body. The throttle valve body only shows the shaft portion. As will be understood from this figure, one of the two faces 150, 160 of the throttle valve body 140, which is set such that the throttle valve body 140 and the throttle body 110 are in contact, has a throttle body. Although it is in contact with 110, the other side 160 does not contact the throttle body 110, and the clearance 170 has arisen.

An object of the present invention is to provide a throttle valve device capable of eliminating the imperfections of the seal as described above and reducing the number of assembly steps of the throttle valve body.

The present invention for achieving the above object is a throttle valve device for an internal combustion engine having a throttle valve body and a throttle body accommodating the throttle valve body, wherein the throttle valve body opens and closes an intake passage portion in the throttle body. A butterfly valve portion and a shaft portion for supporting the butterfly valve portion with respect to the throttle body, wherein the butterfly valve portion is covered with an elastic portion made of an elastic material preferably added by double molding. There is a first feature.

Moreover, this invention has a 2nd characteristic in that the said throttle valve main body is provided with the recessed part and / or the hole which the said elastic material can penetrate.

In the present invention, the elastic portion extends from the valve portion to the shaft portion, and the extension portion includes a corrugated circumferential edge, and the throttle body is provided with a wall surface on which the circumferential edge side portion contacts. There is a 3rd characteristic in that it is made.

Moreover, this invention is the said butterfly valve part and the said shaft part integral structure by resin, The said shaft part has a diameter larger than the largest dimension of the said butterfly valve part on one side of the said butterfly valve part, and the other The fourth feature is that the side has a diameter smaller than the maximum dimension.

Moreover, this invention has the 5th characteristic that the said throttle valve main body is positioned with respect to the said throttle body in the direction along the said axis line in the state which was loaded to one side along the axis line of the said shaft part.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described with reference to drawings. 2 is a sectional view of principal parts of an internal combustion engine including a throttle valve device according to an embodiment of the present invention. In the figure, an intake valve 3 is arranged in the intake port 2 formed in the cylinder head 1 of the internal combustion engine. The intake pipe 4 which introduces the mixer into the intake port 2 includes a cage 5 coupled to the cylinder head 1, a heat insulator 6 formed of a heat insulating material, and an air cleaner case 7. And the throttle body 8. In the portion of the intake pipe 4 formed at the lower portion of the air cleaner case 7, a fuel injection valve 9 is disposed with the injection hole directed into the intake pipe 4. The heat insulator 6 prevents heat from the engine to be directly transferred to the air cleaner 7 and the throttle body 8, and the air cleaner case 7 and the throttle body 8 are made of a resin having a relatively low heat resistance. It is possible to form with a material.

The throttle body 8 is attached to the inside of the air cleaner case 7, and the air cleaned by the air cleaner main body (air filter) which is not shown in figure is the upper part of the throttle body 8 in the intake stroke of an internal combustion engine. It is introduced into the intake pipe 4 from the expanded suction port 81. The throttle valve body 10 is axially supported by the throttle body 8 so as to be able to swing. The throttle valve body 10 includes a butterfly valve portion (hereinafter simply referred to as a "valve portion") 11 and a shaft portion 12 supporting the valve portion 11 to the throttle body 8.

1 is a sectional view of a throttle valve device, and FIG. 3 is a side view of the same. In FIG. 1 and FIG. 3, the shaft part 12 consists of the large diameter part 13 located in the upper part of FIG. 1, and the small diameter part 14 located in the lower part. The cross-sectional shape of the intake pipe at the position where the valve part 11 and the valve part 11 are arrange | positioned is rectangular, and the valve part 11 is formed in the surface of the step | step formed in the throttle body 8 in the throttle closed state. Contact. This step is formed by shifting the axis of the intake pipe 4 on the upstream side and the downstream side of the valve portion 11 (see cross-sectional shape of the throttle body 8 in FIG. 2).

In short, the diameter of the large diameter part 13 is larger than the rectangular side of the valve part 11 (in other words, the largest dimension in the direction orthogonal to the axial part 12 of the valve part), and the diameter of the small diameter part 14 is It is set smaller than one side of the rectangle of the valve part 11. The valve portion 11 is coupled to both ends of the large diameter portion 13 and the small diameter portion 14 and is positioned at the middle of the large diameter portion 13 and the small diameter portion 14. The large diameter part 13 is inserted in the sleeve 15 which protrudes from the throttle body 8, and the small diameter part 14 has the inner wall (of the double sleeve 16 which protruded to the opposite side of the sleeve 15) ( 17 is inserted through the collar 18. The end of the small diameter portion 14 protrudes from the inner wall 17. The washer 19 passes through the protrusion, and the stop ring 20 is fitted to prevent the throttle valve body 10 from escaping from the throttle body 8.

The valve portion 11 is provided with an elastic portion 21 covering the valve portion 11. The elastic portion 21 includes annular portions 22, 23 extending from the valve portion 11 to the large diameter portion 13 and the small diameter portion 14, respectively. The circumferential edges of the annular portions 22 and 23 are formed in a wave shape in order to bend easily at the portion in contact with the throttle body 8 to improve adhesion. The elastic portion 21 is preferably formed of an elastic polymer. Elastomers are materials with excellent chemical resistance. The action of the elastic portion 21 will also be described later.

The valve portion 11 and the shaft portion 12 are integrally formed by resin molding. In addition, the elastic portion 21 is added to the resin molded valve portion 11 and the shaft portion 12 by molding.

The outer circumference of the sleeve 15 is provided with a torsion spring 24 for pressing the shaft portion 12 in the throttle closing direction. One end of the torsion spring 24 is fixed to the base portion of the sleeve 15, and the other end is fixed to the flange portion 25 protruding upward of the coarse diameter portion 13. An annular groove 26 is formed in the flange portion 25 along the outer circumference, and the throttle cable 27 is attached to the flange portion 25 by being guided to the groove 26. One end of the throttle cable 27 is coupled to the flange portion 25 by a pin 28, while the other end is coupled to an accelerator operation portion (not shown in the motorcycle) and a steering bar grip.

The torsion spring 24 is provided in the shaft part 12 so that the valve part 11 may be pressurized in the throttle totally closed direction, and when the throttle cable 27 pulls this throttle cable 27, the torsion spring 24 is carried out. Is attached to the flange portion 25 so that the shaft portion 12 rotates in the opposite direction to the pressing direction by the cross section.

When attaching the throttle valve main body 10 to the throttle body 8, the throttle valve main body 10 is inserted with respect to the sleeve 15 from the small diameter part 14 side. The small diameter portion 14 penetrates through the inner wall 17 of the sleeve 16 and protrudes its end portion from the inner wall 17, and then the washer 19 and the stop ring 20 are removed from the small diameter portion ( 14) to the outer periphery of the end. Since the throttle valve body 10 consists of the large diameter part 13 and the small diameter part 14, attachment from the one direction with respect to the throttle body 8 is easy.

The throttle valve body 10 is mounted to the throttle body 8 such that the circumferential edge of the elastic portion 21, in particular the side surface, is pressed against the throttle body 8 to obtain reliable sealing performance. In short, the stop ring 20 is fitted to the shaft portion 12 in a state where a thrust load is applied to the torsion spring 24 in a direction (direction B described later) directed from the large diameter portion 13 side to the small diameter portion 14 side. Lose.

The small diameter portion 14 is coupled with a connecting shaft 29 for connecting the throttle sensor 28 to the small diameter portion 14. The throttle sensor 28 is, for example, a variable resistor and can detect the throttle opening degree based on a resistance value corresponding to the rotational position of the connecting shaft 29 coupled to the small diameter portion 14.

4 is a perspective view of the completed throttle valve body 10, and the same reference numerals as those in FIGS. 1 and 3 indicate the same parts.

5-10 is explanatory drawing of the shaping | molding method of the throttle valve main body 10 and the elastic part 21. FIG. In molding, first, as shown in FIG. 5, a mold 30 for molding (injection molding) the throttle valve body 10 except for the elastic portion 21 is prepared. The mold 30 consists of a part 301 and a part 302. The resin 31 is injected into the mold 30 from the resin injection port 303. In the state of FIG. 6 in which sufficient resin 31 was injected into the mold 30, the injection is finished, and the mold 30 is waited for cooling of the resin 31 to be removed (in the direction of the arrow in FIG. 7). ).

In this way, the elastic portion 21 is integrally added to the core portion (ie, the throttle valve body 10 without the elastic portion 21 added) 32 of the completed throttle valve body 10. A frame 33 is prepared (FIG. 8). The frame 33 consists of a portion 331 and a portion 332. When the part 32 of the shim of the throttle valve main body 10 is inserted in this mold 33, the space 34 for the elastic part 21 will be made as shown in FIG. From there, the elastomer 36 is injected from the elastomer injection port 35. 10 shows a state where the elastomer 34 is filled in the space 34. When the frame 33 is removed after cooling, the throttle valve body 10 in which the elastomer 36 is integrally added to the shim portion 32 of the throttle valve body 10 as the elastic portion 21 (see FIG. 4). ) Is completed.

FIG. 11: is sectional drawing which shows the engagement part of the valve part 11 and the throttle body 8. FIG. In the figure, the valve portion 11 is pressed in the direction of the arrow A by the force of the torsion spring 24 when the throttle is fully closed. Therefore, the edge 211 of the elastic portion 21 covering the circumference of the valve portion 11 is pressed against the steps 81 and 82 of the throttle body 8. The elastic part 21 is crimped | bonded and deform | transformed by the step | steps 81 and 82, and is reliably contacted by both surfaces of the step | steps 81 and 82. As shown in FIG.

FIG. 12: is sectional drawing which shows the engagement part of the elastic part 21 and the throttle body 8. FIG. In the figure, the throttle valve body 10 is attached to the throttle body 8 in a state in which a thrust weight is applied in the direction of arrow B. In FIG. Therefore, the annular portions 22 and 23 of the elastic portion 21 are pressed against the surfaces of the steps 83 and 84 of the throttle body 8 and bent by the thrust weighting, respectively. The amount of warpage depends on the deviation of the tolerances of the throttle valve body 10 and the throttle body 8, but in the example of FIG. 2, the side of the annular portion 23 is larger than the annular portion 22.

In addition, in FIG. 12, the resin portion 21 penetrates through the holes 37 and 38 formed in the large diameter portion 13 and the small diameter portion 14 and protrudes into the large diameter portion 13 and the small diameter portion 14. Have portions 39, 40. Since the large diameter portion 13 and the small diameter portion 14 are fitted by the protruding portions 39 and 40 and the annular portions 22 and 23, the portion of the shim of the elastic portion 21 and the throttle valve body 10 is provided. (28) is combined more reliably.

In order to improve the coupling between the valve portion 11 and the elastic portion 21, the valve portion 11 can also be provided with holes or recesses into which the elastomer can flow during molding. FIG. 13: is a perspective view of the valve part 11 except the elastic part 21, and the some recessed part 41 is formed in the surface of the valve part 11. As shown in FIG. The concave portion 41 may be provided on the surface of the shaft portion 12 in which the annular portions 22 and 23 of the elastic portion 21 are in close contact with each other. In addition, instead of the recessed part 41, you may provide the hole which penetrates the valve part 11, The number is not limited. Moreover, the hole and the recessed part may be mixed.

Thus, according to this embodiment, the seal of the throttle valve main body 10 and the throttle body 8 is reliably performed by the elastic body 21 provided in the valve part 11.

In addition, the shaft part 12 may be made into a fixed shaft diameter, and may reduce the shaft diameter of the flange 181 side, without providing the large diameter part which enlarged the shaft diameter of the flange 181 side. In this case, in order to enable insertion of the throttle valve body 10 from one side of the throttle body 8, a bearing (bush) supporting the shaft (large diameter portion in FIG. 1) on the flange 181 side is provided. Two-segment structure In short, the thing divided into the dividing surface along the longitudinal direction of the axial part 12 is used.

According to the first aspect, since the butterfly valve portion is covered with the elastic portion, even when the tolerance deviation of the rotation angle of the valve and the tolerance deviation of the shape of the intake passage in the throttle body that the butterfly valve portion contacts at the time of throttle closing are large. These variations can be absorbed by the deformation of the elastic portion. Therefore, the sealing property in the throttle closed state can be improved. Moreover, an elastic part can be easily added by double molding.

According to the second aspect, since the elastic material penetrates into the recesses and / or holes during molding, the coupling between the elastic parts and the throttle valve body is further ensured.

According to the third feature, the circumferential edge portion of the waveform contacts the wall surface formed in the throttle body. At this time, the circumferential edge portion is a waveform that tends to bend, so that it can be in close contact with the wall surface in the throttle body and add high sealing property.

According to a 4th characteristic, since the throttle valve main body can be inserted into the throttle body from the small diameter part, assembly is easy.

According to the fifth aspect, since a load is applied to the throttle valve body in the direction of the axis extension, the circumferential edge portion of the extension portion of the elastic portion can be pressed to the wall surface of the throttle body to improve the sealing property.

Claims (6)

A throttle valve device for an internal combustion engine having a throttle valve body and a throttle body accommodating the throttle valve body, The throttle valve body includes a butterfly valve portion for opening and closing an intake passage portion in the throttle body, and a shaft portion for supporting the butterfly valve portion with respect to the throttle body, A throttle valve device, characterized in that the butterfly valve portion is covered with an elastic portion. The throttle valve device according to claim 1, wherein the elastic part is fixed to the throttle valve body by a double molding method in which the elastic material is added to the molded throttle valve body by molding. The throttle valve device according to claim 2, wherein the throttle valve body is provided with a recess and / or a hole through which the elastic material can enter. The said elastic part is extended from the said valve part to the axial part, The extended part is a wave-shaped peripheral edge in any one of Claims 1-3, The said throttle body is provided with the wall surface which the said peripheral-edge side part contacts, The throttle valve apparatus characterized by the above-mentioned. The said butterfly valve part and the said axial part are integral structures of resin in any one of Claims 1-3, The shaft portion has a diameter larger than the maximum dimension of the butterfly valve portion on one side of the butterfly valve portion, and a diameter smaller than the maximum dimension on the other side. The throttle valve device according to claim 4, wherein the throttle valve body is positioned with respect to the throttle body in the direction along the axis in a state where the throttle valve body is loaded to one side along the axis line of the shaft part.

Images