JP2008309088A - Variable intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable intake device capable of easily incorporating a switching valve into an intake passage structure and capable of smoothly operating the switching valve without affected by strain of the intake passage structure. <P>SOLUTION: In the variable intake device, an actuator connected with an end part of a valve stem of the switching valve for switching an intake air quantity is fixed with a side wall of the intake passage structure and the valve stem 33 is rotatably supported by a bearing member 67 in the intake passage structure. The intake passage structure is separated into a plurality of structures and is composed of these separated structures which are welded and adhered with each other. A bearing support part 65 for loading the bearing member 67 is formed for a structure 21 of the separated structures, a bearing holder 75 for holding the bearing member 67 sandwiched between the bearing support part 65 and the bearing holder 75 in the bearing support part 65. A claw part 79 engageably and disengageably fixed to an engaging part 71 of the bearing support part 65 is integrally formed for the bearing holder 75. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a variable intake device provided with a switching valve for switching an intake passage of an intake passage structure.

The variable intake device can change the length of the intake pipe and the like according to the operating state of the engine, and can achieve both low-speed torque and high-speed power.
Among such variable intake devices, there is one in which an intake passage structure is manufactured from a synthetic resin in order to reduce weight and reduce costs. For example, in the variable intake device shown in Patent Document 1, two intake pipes are formed in parallel for each cylinder of an engine, and a switching valve provided on one of the intake pipes is operated to thereby change the intake path. The intake passage structure is divided into a plurality of structures, and each of the divided structures is formed by injection molding and integrally joined by vibration welding or the like. Yes. In this case, a shaft holder is incorporated in order to fix the valve shaft of the switching valve to the intake passage structure, and the shaft holder is formed integrally with one of the divided structures and individually. A plurality of formed ones are provided, and the switching valve is incorporated into the intake passage structure by joining the divided structures while supporting a plurality of locations of the valve shaft by these shaft holders.
JP 20052942 A

  However, the intake passage structure made of synthetic resin is more likely to cause molding distortion and distortion at the time of welding than metal ones, and the switching valve is mounted while attaching a plurality of shaft holders one by one as described in Patent Document 1. If it is a configuration that supports and incorporates a plurality of locations, it is necessary to attach the components separately while adjusting the influence of the distortion of the divided structure, and the assembly work becomes complicated. Further, the mounting accuracy for each shaft holder tends to vary, and there is a possibility that the operation of the switching valve may be hindered.

  The present invention has been proposed in view of the above circumstances, and can easily incorporate a switching valve into an intake passage structure and smoothly operate the switching valve without being affected by distortion of the intake passage structure. It is an object of the present invention to provide a variable intake device that can perform this.

  The variable intake device of the present invention is provided with a switching valve for switching the intake passage of the intake passage structure, and an actuator connected to one end of the valve shaft of the switching valve is a side wall of the intake passage structure. In the variable intake device in which the valve shaft is rotatably supported by a bearing member inside the intake passage structure, the intake passage structure is divided into a plurality of structures and the divided parts. The structures are joined together by welding, and one of the divided structures is formed with a bearing support portion (a raised portion in the embodiment) for mounting the bearing member. A bearing holder that holds the bearing member in a sandwiched state between the bearing member and the bearing support portion, and a leg that is detachably fixed to the locking portion of the bearing support portion on the bearing holder. There, characterized in that it is integrally formed.

With such a configuration, after the bearing member of the valve shaft is held by the bearing holder in one of the plurality of structures, each structure can be joined and assembled in this held state. In other words, since operations such as positioning of the valve shaft are performed in the structure before the structures are joined together, the assembly workability is improved, and the holding work itself also reduces the legs of the bearing holder. A simple thing is sufficient to be engaged with the engaging portion of the bearing support portion of the structure. Of course, since the valve shaft is held before welding, distortion at the time of welding does not affect the holding portion.
In this case, when the actuator is fixed to the side wall of one structure, the bearing support portion may be formed on the structure.

In the variable intake device of the present invention, the bearing holder may be made of an elastically deformable material and elastically contacted with the bearing member.
With this configuration, the bearing holder elastically holds the bearing member, and it is possible to reduce the influence of molding distortion of the split structure on the valve shaft.
In addition, a cushion member may be sandwiched between the outer peripheral surface of the bearing member and the bearing member support portion and the bearing holder, and it is possible to reliably prevent rattling and to make the bearing more accurately. The member can be held.

In the variable intake device of the present invention, the leg portion is a claw portion formed integrally with the bearing holder, and the locking portion is a through-hole portion formed in the bearing support portion into which the claw portion can be inserted. In this case, the bearing holder can be attached to the bearing support portion by an operation of inserting the claw portion into the through hole portion.
The leg portion may be a screw provided in a bearing holder, and the locking portion may be a screw hole formed in the bearing support portion. In this case, the bearing holder is attached by screwing.

  Further, the tip end portion of the valve shaft may be formed in a hemispherical surface, and a ball joint portion that rotatably fits the tip end portion of the valve shaft may be provided on the side portion of the one structure. With this configuration, the tip end of the valve shaft is fitted to the ball joint portion, and the middle position of the valve shaft is placed on the bearing support portion. Since the valve shaft is sandwiched, the valve shaft is supported at least at two locations and can be held more stably.

  According to the variable intake device of the present invention, the valve shaft and its bearing member can be attached by the bearing holder in the structure before joining, so that the assembling workability is improved and the holding work itself is also the bearing holder. The simple leg portion can be engaged with the engaging portion of the bearing support portion of the structure. In addition, since the valve shaft is held before the structure is welded, distortion at the time of welding does not affect the holding portion.

Hereinafter, embodiments of the variable intake device of the present invention will be described with reference to the drawings.
The intake passage structure 2 of the variable intake device 1 corresponds to a four-cylinder engine, and is divided into a plurality of structures made of synthetic resin and integrated by welding the divided structures. It has been configured. In this embodiment, the intake passage structure 2 is largely divided into an upper divided structure 3 and a lower divided structure 4 as shown in FIG.

  As shown in cross section in FIG. 4, the upper divided structure 3 includes a main structure portion 7 constituting the upper half 6 </ b> A of the surge tank portion 6 surrounding the intake chamber 5 and an upper side surface of the main structure portion 7. Each intake passage rear-stage cover portion 9 forming the rear-stage portion 8A of the four intake passages 8 between them, and each intake air formed by joining the intake-passage rear-stage cover portion 9 and the main structure portion 7 A funnel portion 10 is attached across the joint portion of the passage 8, and a PCV (Positive Crankcase Ventilation) portion 11 for taking blow-by gas from an engine (not shown) into the intake passage 8 is further attached. The main structure 7 has a flange 12 that can connect the intake chamber 5 to a duct (not shown) of the throttle body, and a flange 13 that connects each intake passage 8 to each cylinder (not shown) of the engine. And are integrally molded.

  On the other hand, the lower divided structure 4 includes the front stage portion 8B of the four intake passages 8 between the central structure portion 21 constituting the lower half 6B of the surge tank portion 6 and the lower surface of the central structure portion 21. The main component is an intake passage upstream cover portion 22 to be formed and a ball joint portion 23 fixed to the side wall of the central structure portion 21. One end of the front stage portion 8B of the intake passage 8 opens into the intake chamber 5, and an opening 24 at the other end also faces the intake chamber 5.

  The details of the joint portion between the upper divided structure 3 and the lower divided structure 4 will be described. The main structure portion 7 in the upper divided structure 3 constitutes the upper half 6A of the surge tank portion 6 as described above. The lower half of the upper half 6A is open. On the other hand, the central structure portion 21 in the lower divided structure 4 constitutes the lower half 6B of the surge tank portion 6, and the upper portion of the lower half 6B is open. The downward peripheral edge 7a of the main structure 7 in the upper divided structure 3 and the upward peripheral edge 21a of the central structure 21 in the lower divided structure 4 are the upper divided structure 3 and the lower divided part. This is a joint portion with the structure 4, and the suction chamber 5 surrounded by the surge tank portion 6 is formed by joining the peripheral portions 7 a and 21 a.

  On the other hand, the opening 24 at the other end of the intake passage 8 formed in the central structure 21 of the lower divided structure 4 is provided at a position drawn inward from the peripheral edge 21 a of the central structure 21. When the upper divided structure 3 is joined to the lower divided structure 4, the front portion 8B of the intake passage 8 in the lower divided structure 4 and the rear portion 8A of the intake passage 8 in the upper divided structure 3 4 with a relatively large gap G between them, that is, the openings 24 in the lower divided structure 4 and the funnel part 10 in the upper divided structure 3 are formed. It comes to oppose. And the cylinder 34 mentioned later of the switching valve 31 is arrange | positioned between this opposition.

  In this embodiment, the switching valve 31 is a slide valve, and as shown in FIG. 3, the valve shaft 33 that is rotated by the actuator 32 is located at the middle of the opening 24 in the lower divided structure 4. The upper divided structure 3 is bent so as to avoid a space between the funnel portion 10 and the opening 24 in the lower divided structure 4 is formed in the opening 24 and the upper divided structure 3 in the upper divided structure 3. Fork portions that are slidably covered with cylinders 34 having lengths that can be connected to the funnel part 10 and that engage the projections 35 provided on the outer side of each cylinder 34 on the valve shaft 33. 36 is provided, and the fork portion 36 is swung by the rotation of the valve shaft 33, and the cylindrical body 34 is reciprocally slid as shown by the arrows in FIG. In the example shown in FIG. 3, the valve shaft 33 is formed to be bent in a U-shape between the distal end portion 33a and the base end portion 33b and the central portion 33c, and the cylindrical body 34 is formed in these bent portions 33d. Are arranged two by two, and the cylinders 34 are connected to each other.

Then, by rotating the valve shaft 33, the cylindrical body 34 is brought close to the funnel portion 10 in the upper divided structure 3, and the opening in the funnel portion 10 and the lower divided structure 4 as shown in FIG. When the cylinder 24 is connected to the portion 24, the front portion 8B of the intake passage 8 in the lower divided structure 4 and the rear portion 8A of the intake passage 8 in the upper divided structure 3 are in communication with each other. The long intake passage length from the intake chamber 5 to the engine via the entire length of the intake passage 8 is set.
On the other hand, the cylindrical body 34 of the switching valve 31 is separated from the funnel portion 10 in the upper divided structure 3, and the gap between the opening 24 in the lower divided structure 4 and the funnel portion 10 in the upper divided structure 3. When G is opened, the rear portion 8A of the intake passage 8 in the upper divided structure 3 is directly opened in the intake chamber 5, and the short intake passage length from the intake chamber 5 via the rear portion 8B of the intake passage 8 is short. Is set to

  As shown in FIG. 3, the actuator 32 is attached to the outer side of the central structure 21 in the lower divided structure 4, and has a relatively large hole formed in the side wall of the central structure 21. The bearing mechanism part 42 attached to the part 41 and rotatably supporting the base end part 33b of the valve shaft 33, and the drive part 43 connected to the outside of the bearing mechanism part 42 and rotating the valve shaft 33 are configured. Yes.

  As shown in FIG. 3, the valve shaft 33 has a hemispherical tip 33 a and is rotated by a ball joint 23 fixed to the central structure 21 of the lower divided structure 4. Fits freely. That is, the ball joint portion 23 has a shape in which a flange 62 is integrally formed around the bearing portion 61 in the shape of a hemispherical shell, and the outer side so as to fit into a through hole 63 formed in the side wall of the central structure portion 21. By fixing the flange 62 from above, the bearing portion 61 is directed to the inside of the central structure portion 21 through the through hole 63. And the front-end | tip part 33a of the said valve shaft 33 is fitted by the bearing part 61 of this ball joint part 23 so that rotation is possible.

  On the other hand, the central portion 33 c of the valve shaft 33 is supported on a raised portion 65 serving as a bearing support portion that protrudes from the central portion of the central structure portion 21 of the lower divided structure 4. As shown in FIG. 5, the raised portion 65 has an arc-shaped concave portion 66 formed on the upper surface, and the arc-shaped concave portion 66 may be referred to as a bearing member (an intermediate portion bearing member for distinguishing from other bearing members). ) 67 is placed. This bearing member 67 has a structure in which a pair of semi-cylindrical members 68 formed by vertically dividing a cylindrical body are joined, and both semi-cylindrical members 68 have flat plate portions 69 along the length direction thereof in the radial direction from both side edges. Are integrally formed. Further, the flat plate portions 69 of both the semi-cylindrical members 68 are formed with through-hole portions 70 penetrating them when they are joined, and the raised portions 65 in the central structure portion 21 are also provided with the arcuate recesses. A through-hole portion 71 is formed at a position corresponding to the through-hole portion 70 when the bearing member 67 is placed on 66. And the bearing holder 75 is attached so that it may latch on these bearing members 67 and the through-hole parts 70 and 71 of the center structure part 21. FIG.

  In this bearing holder 75, flat plate portions 77 are integrally formed on both side edges of a semicircular cover portion 76 covering the upper half of the bearing member 67, and a claw portion 78 extending in a direction perpendicular to the surface is integrated with each flat plate portion 77. It is set as the structure formed in. In the illustrated example, the claw portions 78 are formed integrally with the outward hook portions 80 at the distal ends of the arms 79 parallel to each other, and the outer surfaces of the hook portions 80 are the outer surfaces of the both claw portions 78. The taper surface 80a is tapered so that the dimension between them gradually decreases toward the tip.

  In this case, the bearing holder 75 is made of a synthetic resin material that is easily elastically deformed, and the claw portions 78 can be elastically deformed in a direction of narrowing the mutual interval between the hook portions 80, and by reducing the mutual interval, An outward restoring force is generated in both hook portions 80. And the maximum dimension between the taper surfaces 80a of these claw parts 80 is set larger than the maximum dimension between the outer edge of the bearing member 67 and the through-hole parts 70 and 71 of the central structure part 21, When the claw portion 78 of the bearing holder 75 is inserted into the through-hole portions 70 and 71, when the hook portion 80 at the tip of the claw portion 78 passes through the through-hole portions 70 and 71, the tapered surface 80a of the hook portion 80 becomes the through-hole. By being pushed by the inner edges of the portions 70 and 71, the claw portions 78 are inserted while the mutual interval is reduced, and when the tapered surface 80a passes through the through-hole portions 70 and 71, the claw portions 78 are restored. The hook portion 80 of the claw portion 78 protrudes to the back side of the central structure portion 21 and is locked to the peripheral edge of the through hole portion 71 of the central structure portion 21 so as to be prevented from coming off. That is, in this embodiment, the claw portion 78 of the bearing holder 75 is a leg portion of the present invention, and the through hole portion 71 of the raised portion 65 is a locking portion for the claw portion 78 of the bearing holder 75.

  A groove 81 is formed along the circumferential direction at the center position on the inner peripheral surface of the semicircular cover portion 76 of the bearing holder 75, and an elastic ring 82 such as an O-ring is formed in the groove 81. The elastic ring 82 is in elastic contact with the outer peripheral surface of the bearing member 67. The front and rear of the elastic ring 82 are slightly spaced between the semicircular cover portion 76 and the bearing member 67. A clearance C1 is formed.

Next, a method for assembling the variable intake device 1 configured as described above will be described.
First, the upper divided structure 3 composed of the main structure portion 7, the intake passage rear cover portion 9, the funnel portion 10, and the PCV portion 11, the lower structure composed of the central structure portion 21, the intake passage front cover portion 22, and the ball joint portion 23. The divided structures 4 are assembled separately. At the time of this assembly, each component is joined and pressurized and welded while applying vibration. When the component is a small part or the like, for example, when the funnel part 10 or the ball joint part 23 is welded, vibration is applied by ultrasonic waves. Further, in the case where the rotating body shape is formed as in the case of fixing the flange 62 of the ball joint portion 23, the ball joint portion 23 may be fixed by so-called spin welding in which the ball joint portion 23 is pressed while rotating at high speed.

Then, the switching valve 31 is incorporated in the lower divided structure 3 out of the two divided structures 3 and 4 integrated in this way. At this time, as shown in FIG. One semi-cylindrical member 68 of the intermediate bearing member 67 is placed on the arc-shaped concave portion 66 in the raised portion 65 of the central structure portion 21 of the lower divided structure 4. Then, as shown by the arrow in FIG. 8B, while the tip 33a of the valve shaft 33 is fitted into the bearing 61 of the ball joint 23, the valve shaft 33 is shown in FIG. The central portion 33c is placed on the semi-cylindrical member 68 of the intermediate portion bearing member 67 that has been previously arranged. Next, after the other semi-cylindrical member 68 of the intermediate portion bearing member 67 is put on the central portion 33c of the valve shaft 33, a bearing holder 75 is further attached thereon, and the claw portion 78 of the bearing holder 75 is attached. It is inserted into the bearing member 67 and the through hole portions 70 and 71 of the central structure portion 21 to prevent it from coming off.
On the other hand, the base end portion 33b of the valve shaft 33 of the switching valve 31 faces the hole 41 in the side portion of the central structure portion 21 of the lower divided structure 4, and as shown in FIG. The bearing mechanism portion 42 of the actuator 32 is attached so as to be connected to the base end portion 33 b of the valve shaft 33, and is fixed to the outer portion of the central structure portion 21 with the drive portion 43 connected to the bearing mechanism portion 42.

When the switching valve 31 is held in the central structure portion 21 of the lower divided structure 4 in this way, the base end portion 33b of the valve shaft 33 of the switching valve 31 is connected to the actuator 32, and the actuator 32 is firmly fixed to the lower divided structure 4 by screwing or the like. On the other hand, the tip 33a of the valve shaft 33 is supported by the ball joint portion 23 of the lower divided structure 4, and the valve shaft 33 The central portion 33c is held on the raised portion 65 of the lower divided structure 4 by a bearing holder 75 with the intermediate bearing member 67 attached.
With the switching valve 31 installed, the lower divided structure 4 is covered with the upper divided structure 3, and the joint portions of the two (the peripheral portions 7a and 21a of the main structure portion 7 and the central structure portion 21) are combined. The whole is assembled by vibration welding.

That is, in assembling the variable intake device 1, the upper divided structure 3 and the lower divided structure 4 are assembled separately, the switching valve 31 is installed in the lower divided structure 4, and the valve shaft 33 is fixed to the lower divided structure 4 together with the actuator 32, and the central portion 33 c of the valve shaft 33 in which the distal end portion 33 a is supported by the ball joint portion 23 is temporarily fixed by the bearing holder 75. Thus, the two divided structures 3 and 4 are welded and joined together.
As a work for incorporating the switching valve 31 in this way, except that the actuator 32 is fixed to the lower divided structure 4, the tip 33 a of the valve shaft 33 is fitted to the ball joint 23 and the central portion 33 c is a bearing. It is possible to assemble by simply temporarily fixing with the holder 75 and welding the upper divided structure 3 to the lower divided structure 4, and the intake passage structure 2 incorporating the switching valve 31 can be manufactured very simply. It can be done.

In addition, this invention is not restricted to the structure of the said embodiment, Various deformation | transformation are possible.
10 and 11 show a modification of the support structure for the central portion 33c of the valve shaft 33. FIG.
FIG. 10 shows the first modification. In FIG. 10, the intermediate bearing member 67 is the same as that in the above embodiment, but the bearing holder 111 is formed with the through-hole portions 112 in the flat plate portions 77 on both side edges of the semicircular cover portion 76. A screw hole portion 113 is formed in the raised portion 65 of the central structure portion 21, and the bearing holder 111 is fixed to the raised portion 65 by a screw 114. In this example, the screw 114 of the bearing holder 111 is a leg, and the screw hole 113 of the raised portion 65 is a locking portion.
In addition, even when the claw portion 78 is provided in the bearing holder as in the embodiment of FIG. 5, the locking portion is not limited to the through-hole portion 71 of the raised portion 65, but may be a shape such as a concave portion or a hook-like portion. Good.
FIG. 11 shows a second modification of the support structure for the central portion 33 c of the valve shaft 33. In FIG. 11, a ring-shaped collar 119 is provided so as to span between a groove 115 formed in the circumferential direction of the valve shaft 33 and a groove 118 formed in the inner peripheral portion of the semi-cylindrical member 117 of the bearing member 116. The collar 119 can support a thrust load acting on the valve shaft 33.

On the other hand, FIG.12 and FIG.13 has shown the example which changed the support structure of the front-end | tip part of a valve shaft. Also in these drawings, the same reference numerals are given to the same elements as those in the above embodiment to simplify the description.
In this example of the variable intake device, a sliding valve similar to that shown in FIG. 2 is used as the switching valve. However, the tip 33a of the valve shaft 33 has a cylindrical bearing member (which is rotatably supported). (Tip bearing member) 121 is provided, and as shown in FIG. 12, the bearing member 121 is installed in a support recess 122 formed in the central structure portion 21 of the lower divided structure 4, Then, a holding portion 123 formed on the main structure portion 7 of the upper divided structure 3 is covered, and the two divided structures 3 and 4 are joined in this state, so that the bearing member 121 is joined to the both divided structures 3 and 4. Is held between the two.

In this case, as shown in FIG. 12, between the inner surface of the support recess 122 and the outer peripheral surface of the bearing member 121 in the central structure portion 21, and the lower surface of the pressing portion 123 and the outer peripheral surface of the bearing member 121 in the main structure portion 7. Clearances C2 are formed between the two. The clearance C2 is set to such an extent that the bearing member 121 does not rotate together with the rotation of the valve shaft 33 supported by the bearing member 121. For example, a roller bearing is used as the bearing member 121, or even in the case of a sliding bearing, it is preferable that resistance against rotation of the valve shaft 33 on the inner peripheral surface is extremely small as compared with friction on the outer peripheral surface.
Alternatively, as shown in FIG. 13, a cushion member 124 may be provided in the clearance C2. The cushion member 124 is formed of, for example, an O-ring, and the clearance C2 is left behind in the axial direction, so that the bearing member 121 is allowed to be slightly tilted.

In the variable intake device configured as described above, a cylindrical tip end bearing member 121 is attached to the tip end portion 33a of the valve shaft 33 of the switching valve, and this bearing member is connected to the central structure portion 21 of the lower divided structure 4. The bearing member 121 is assembled so as to be sandwiched between the divided structures 3 and 4 when the two divided structures 3 and 4 are joined. It can be incorporated by a simple method. Also in this case, the central portion 33c of the valve shaft 33 is in a state in which the intermediate bearing member 68 is held by the bearing holder 75 before joining (see FIG. 5 and the like), so that the valve shaft 33 is not dropped.
In this case, the tip end bearing member may be any member that supports the valve shaft rotatably at its inner peripheral portion, even if the outer peripheral surface is not a circular cylindrical shape, and a flat surface is formed on the outer peripheral surface. The bearing member may be prevented from rotating when one of the divided structures comes into surface contact with the plane. In addition, the outer peripheral surface may be formed in a square cross section, or a shape in which the distance from the center of the bearing member gradually changes along the circumferential direction, such as an outer shape having an elliptical cross section.

  The variable intake device of the present invention can be changed in a range not departing from the gist of the present invention other than the above-described modified examples. For example, as the switching valve, a rotary valve can be used instead of the slide valve of the above embodiment. A valve, a butterfly valve, or the like can also be applied. In this case as well, as in the above-described embodiment, the tip end portion of the valve shaft is supported by the ball joint portion, and the intermediate bearing member is supported by the bearing holder and the lower divided structure. Can be held in. Further, the shape of the bearing support portion for supporting the intermediate portion bearing member is not limited to the shape of the raised portion 65 of the central structure portion 21 in the above embodiment, and can be changed to an appropriate shape as long as it can support the bearing member. In addition, the bearing holder may be formed of an elastically deformable metal other than the synthetic resin, or may not necessarily be formed of an elastic material when a cushion member is interposed.

It is a disassembled perspective view of the intake passage structure in the embodiment of the variable intake device of the present invention. It is the perspective view which looked at the state which incorporated the switching valve in the lower side division structure of the intake passage structure of FIG. 1 from diagonally upward. FIG. 3 is a cross-sectional view of the lower divided structure of FIG. 2 with the valve shaft of the switching valve as the center. It is the longitudinal cross-sectional view which made the whole variable intake device of the said embodiment a cross section. It is a longitudinal cross-sectional view which shows the state which hold | maintained the bearing member of the valve-shaft intermediate part of the switching valve in the said embodiment to the lower side division structure. It is sectional drawing which made the part shown in FIG. 5 into the longitudinal cross-section along the valve-axis direction. It is a perspective view which shows the assembly state of the intake passage structure of FIG. It is a perspective view which shows the front | former part of the process of incorporating a switching valve in the lower part division structure of FIG. 2 in order of (a) (b). It is a perspective view which shows the back | latter stage part of the process following FIG. 8 in order of (a) (b). It is a longitudinal cross-sectional view similar to FIG. 5 which shows the 1st modification of the support structure of the valve-shaft center part of a switching valve. It is a longitudinal cross-sectional view similar to FIG. 6 which shows the 2nd modification of the support structure of the valve-shaft center part of a switching valve. It is the perspective view which looked at the lower side division structure which incorporated the switching valve in the example which provides a bearing member in the valve-shaft front-end | tip part of a switching valve, and is clamped by the upper and lower division structures from diagonally upward. It is a longitudinal cross-sectional view which shows the state which clamped the valve-shaft front-end | tip part with the up-and-down division structure in the example of FIG. It is a longitudinal cross-sectional view which shows the example which interposed the cushion member in the clamping structure part of the bearing member shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Variable intake device 2 Intake passage structure 3 Upper part division structure 4 Lower part division structure 7 Main structure part 7a Peripheral part (joint part)
8 Intake passage 10 Funnel part 21 Central structure part 21a Peripheral part (joint part)
23 Ball joint part 24 Opening part 31 Switching valve 32 Actuator 33 Valve shaft 33b Center part 34 Tubular body 65 Raised part (bearing support part)
66 Arc-shaped concave portion 67 Bearing member (intermediate portion bearing member)
68 Semi-cylindrical member 69 Flat plate part 70 Through-hole part 71 Through-hole part (locking part)
75 Bearing holder 76 Semi-circular cover part 77 Flat plate part 78 Claw part (leg part)
79 Arm 80 Hook 80a Tapered surface 81 Groove 82 Elastic ring C1, C2 Clearance G Gap 111 Bearing holder 112 Through-hole 113 Screw hole (locking part)
114 screw (leg)
115 Groove 116 Bearing member 117 Semi-cylindrical member 118 Groove 119 Color

Claims (6)

A switching valve for switching the intake passage of the intake passage structure is provided, and an actuator connected to one end of the valve shaft of the switching valve is fixed to a side wall of the intake passage structure, and the intake passage structure In the variable intake device in which the valve shaft is rotatably supported by a bearing member inside the body,
The intake passage structure is divided into a plurality of structures, and the divided structures are joined together by welding, and the bearing member is attached to one of the divided structures. A bearing support for mounting is formed, and a bearing holder for holding the bearing member in a sandwiched state between the bearing support and the bearing support is provided in the bearing support, and the bearing holder is engaged with the bearing support. A variable intake device, wherein a leg portion that is detachably fixed to the portion is integrally formed.   The variable intake device according to claim 1, wherein the bearing holder is made of an elastically deformable material and is in elastic contact with the bearing member.   The variable intake device according to claim 1, wherein a cushion member is sandwiched between an outer peripheral surface of the bearing member and the bearing member support portion and the bearing holder.   The said leg part is a nail | claw part integrally formed in the bearing holder, The said latching | locking part is a through-hole part which can be formed in a bearing support part and can insert the said nail | claw part. The variable intake device according to any one of the above.   4. The variable according to claim 1, wherein the leg portion is a screw provided in a bearing holder, and the locking portion is a screw hole portion formed in the bearing support portion. 5. Intake device. The tip of the valve shaft is formed in a hemispherical surface, and a ball joint portion that rotatably fits the tip of the valve shaft is provided on a side portion of the one structure. The variable intake device according to any one of 1 to 5.

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