CN214499230U - Air intake device for internal combustion engine - Google Patents

Abstract

The utility model provides a can restrain air inlet unit of internal-combustion engine of rocking of axis of rotation. The intake device 2 of the internal combustion engine includes a 1 st bearing portion 22 and a 2 nd bearing portion 23, the 1 st bearing portion 22 is provided in the intake device main body 2a, and supports the turning shaft 2f so that the turning shaft 2f can turn, and the 2 nd bearing portion 23 supports the turning shaft 2f together with the 1 st bearing portion 22 in a state where the 1 st bearing portion 22 is press-fitted from one side in the axial direction extending from the turning axis of the turning shaft 2 f.

Description

Air intake device for internal combustion engine

Technical Field

The present invention relates to an air intake device for an internal combustion engine, and more particularly to an air intake device for an internal combustion engine having an air intake device main body including a plurality of air intake passages.

Background

Conventionally, there is known an intake device for an internal combustion engine, which includes an intake device main body including a plurality of intake passages (see, for example, patent document 1).

Patent document 1 discloses an intake apparatus (an intake apparatus for an internal combustion engine) including an intake manifold including a plurality of intake passages. The intake device includes a tumble control valve and a bearing portion. The tumble control valve includes a shaft. The shaft is rotatably supported by the bearing portion. The bearing portion includes a fixed bearing half and a movable bearing half. The stationary bearing half is fixed to the intake manifold. The movable bearing half and the fixed bearing half hold and support the shaft together in such a manner that the shaft is rotatable.

In order to eliminate the positional displacement of the fixed bearing half body due to deformation such as warping and skewing of the intake manifold, the movable bearing half body of the above-mentioned patent document 1 is attached to the fixed bearing half body so as to be movable in the radial direction of the shaft.

Patent document

Patent document 1: japanese laid-open patent publication No. 2006-161885

SUMMERY OF THE UTILITY MODEL

However, in the intake device of patent document 1, when a load is applied to the tumble control valve in the intake air flow direction due to a differential pressure between the intake passage and the combustion chamber, the movable half bearing moves in the intake air flow direction (one direction side in the radial direction of the shaft) regardless of whether the positional deviation of the fixed half bearing is eliminated. Therefore, the intake system (intake system for an internal combustion engine) of patent document 1 has the following problems: the backlash on the other side in the radial direction of the shaft is increased in the backlash between the shaft (rotating shaft) and the bearing portion provided by the movable bearing half and the fixed bearing half, and thus the degree of backlash of the shaft (rotating shaft) is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an intake device of an internal combustion engine capable of suppressing the rocking of a rotation shaft.

In order to achieve the above object, an intake device for an internal combustion engine according to an aspect of the present invention includes: an intake device main body including a plurality of intake passages that communicate with a combustion chamber of an internal combustion engine main body and supply intake air to the combustion chamber; the valve core comprises a rotating shaft and is arranged in a plurality of air inlet channels; the 1 st bearing part is provided in the intake device main body and supports the rotating shaft so that the rotating shaft can rotate; the 2 nd bearing portion supports the rotating shaft together with the 1 st bearing portion in a state where the 1 st bearing portion is press-fitted to one side in an axial direction extending from a rotation axis of the rotating shaft.

In the intake device of an internal combustion engine according to an aspect of the present invention, as described above, the 1 st bearing portion is provided, and the intake device main body is provided with the 1 st bearing portion, and supports the rotation axis in such a manner that the rotation axis is rotatable. In addition, in the intake system of the internal combustion engine, a 2 nd bearing unit is provided, and the 2 nd bearing unit supports the rotary shaft together with the 1 st bearing unit in a state where the 1 st bearing unit is press-fitted from one side in the axial direction extending from the rotary axis of the rotary shaft. Thus, since the rotation shaft is held in a state where the 2 nd bearing is press-fitted into the 1 st bearing, a gap can be made less likely to be formed between the 1 st bearing and the 2 nd bearing, and therefore, even if a load is applied to the valve body in the intake air flow direction due to a differential pressure between the intake passage and the combustion chamber, the 2 nd bearing can be suppressed from moving in one direction in the radial direction of the rotation shaft. As a result, the gap (gap) between the rotating shaft and the bearing formed by the 1 st bearing part and the 2 nd bearing part on the other side in the radial direction of the rotating shaft can be suppressed from increasing, and thus the play of the rotating shaft can be suppressed. Further, since the wobbling of the rotating shaft can be suppressed, the sound generated by the wobbling of the rotating shaft can be suppressed. Further, since the rotating shaft is held in a state where the 2 nd bearing portion is press-fitted into the 1 st bearing portion, a gap can be made less likely to be formed between the 1 st bearing portion and the 2 nd bearing portion, and therefore the inner diameter of the bearing formed by the 1 st bearing portion and the 2 nd bearing portion can be kept constant. As a result, the size of the bearing is not easily reduced from the optimum size, and therefore, an increase in the sliding resistance of the bearing against the rotating shaft due to the reduction in the size of the bearing from the optimum size can be suppressed.

In the intake device for an internal combustion engine according to the above-described aspect, it is preferable that the 1 st bearing portion includes the 1 st positioning surface, the 2 nd bearing portion includes the 2 nd positioning surface, and the 1 st positioning surface and the 2 nd positioning surface are brought into contact with each other to position the 1 st bearing portion and the 2 nd bearing portion in the 1 st direction.

With such a configuration, not only is it difficult to form a gap between the 1 st bearing part and the 2 nd bearing part after the 2 nd bearing part is press-fitted into the 1 st bearing part by the 1 st positioning surface and the 2 nd positioning surface, but also the dimension of the inner diameter of the bearing formed by the 1 st bearing part and the 2 nd bearing part can be set to a more appropriate dimension by performing positioning of the 1 st bearing part and the 2 nd bearing part in the 1 st direction. As a result, the gap (clearance) between the rotating shaft and the bearing formed by the 1 st bearing part and the 2 nd bearing part can be further suppressed from increasing, and thus the wobbling of the rotating shaft can be further suppressed.

In this case, it is preferable that the 1 st bearing portion includes a convex portion having a 1 st positioning surface and projecting toward the 2 nd bearing portion, the 2 nd bearing portion includes a concave portion having a 2 nd positioning surface and provided corresponding to the convex portion, and the 1 st bearing portion and the 2 nd bearing portion are positioned in the 1 st direction by press-fitting the concave portion into the convex portion.

With such a configuration, the 1 st bearing portion provided with the 1 st positioning surface and the 2 nd bearing portion provided with the 2 nd positioning surface can be formed with a simple configuration by the convex portion and the concave portion, and therefore, complication of the configuration of the intake device of the internal combustion engine can be suppressed.

In the intake device for an internal combustion engine provided with the convex portion and the concave portion, preferably, the 1 st direction is a direction orthogonal to the axial direction and the 2 nd direction along the protruding direction of the convex portion, the 1 st positioning surface of the convex portion has a pair of outer side surfaces in the 1 st direction, the 2 nd positioning surface of the concave portion has a pair of inner side surfaces in the 1 st direction, at least one of the pair of outer side surfaces has a protruding portion protruding toward an opposite inner side surface of the pair of inner side surfaces, the opposite inner side surface of the pair of inner side surfaces has an insertion concave portion formed corresponding to the protruding portion and inserted by the protruding portion, the 1 st bearing portion and the 2 nd bearing portion perform positioning in the 1 st direction by abutment of the pair of outer side surfaces and the pair of inner side surfaces, and perform positioning in the 2 nd direction by engagement of the protruding portion and the insertion concave portion.

With such a configuration, unlike the case where the positioning in the 2 nd direction is performed by bringing the pair of outer side surfaces into contact with the pair of inner side surfaces in the 2 nd direction, the positioning in the 2 nd direction is performed by engaging the protruding portion with the insertion recess portion, and a gap can be provided between the 1 st bearing portion and the 2 nd bearing portion in the 1 st direction, so that the 2 nd bearing portion can be prevented from receiving a repulsive force (rebound force) from the 1 st bearing portion in the 1 st direction. Therefore, since the deformation of the 2 nd bearing portion due to the repulsive force can be avoided, the shape change of the inner diameter of the bearing formed by the 1 st bearing portion and the 2 nd bearing portion can be suppressed. As a result, since the shape change of the inner diameter of the bearing can be suppressed, the wobbling of the rotating shaft can be suppressed.

In the intake device for an internal combustion engine according to the above-described aspect, the intake device main body preferably further includes an accommodation recess disposed between the plurality of intake passages, and the 2 nd bearing portion is preferably accommodated in a state of being sandwiched between a pair of inner side surfaces of the accommodation recess.

With such a configuration, even if the 2 nd bearing part moves in the axial direction, since the movement of the 2 nd bearing part can be restricted by the pair of inner side surfaces of the accommodating recess, the 2 nd bearing part can be prevented from coming off the 1 st bearing part.

In the intake device for an internal combustion engine according to the above-described aspect, it is preferable that the intake device for an internal combustion engine further includes a positioning portion that positions the 2 nd bearing portion with respect to the 1 st bearing portion in the axial direction in a state where the 2 nd bearing portion is press-fitted into the 1 st bearing portion.

With such a configuration, since the 2 nd bearing part can be disposed at an appropriate position with respect to the 1 st bearing part by positioning the 2 nd bearing part with respect to the 1 st bearing part by the positioning part, it is possible to ensure an appropriate press-fitting margin (length of a press-fitting portion) between the 1 st bearing part and the 2 nd bearing part. As a result, the holding force for the rotating shaft can be ensured appropriately.

In the intake system of the internal combustion engine according to the above-described aspect, the following configuration is also conceivable.

(subsidiary item 1)

That is, in the intake system of the internal combustion engine according to the one aspect, the 2 nd bearing portion is press-fitted into the 1 st bearing portion by sliding movement from one side in the axial direction extending from the rotation axis of the rotation shaft.

With this configuration, even if a load is applied to the valve body in the intake air flow direction due to a differential pressure between the intake passage and the combustion chamber by sliding the 2 nd bearing part from one side in the axial direction in which the rotation axis of the rotating shaft extends, the 2 nd bearing part can be restricted from moving in the direction along the intake air flow direction by the 1 st bearing part and the 2 nd bearing part sliding when the 2 nd bearing part is slid and pressed into the 1 st bearing part. As a result, the increase in the clearance of the rotating shaft can be more reliably suppressed, and thus the wobbling of the rotating shaft can be further suppressed.

(subsidiary item 2)

In the intake device for an internal combustion engine provided with the convex portion and the concave portion, the convex portion of the 1 st bearing portion is divided into a plurality of portions in the axial direction.

With such a configuration, when the 2 nd bearing part is press-fitted into the 1 st bearing part, the sliding portions of the 1 st bearing part and the 2 nd bearing part can be dispersed, and therefore, the frictional resistance can be reduced. As a result, the 2 nd bearing can be easily press-fitted into the 1 st bearing.

(subsidiary item 3)

In the intake device for an internal combustion engine having the receiving recess, the 2 nd bearing portion further has a sealing convex portion provided on an outer surface facing the receiving recess, and the receiving recess has a sealing contact surface with which the sealing convex portion is in contact.

With such a configuration, air leakage between adjacent ones of the plurality of intake passages can be prevented, and therefore, turbulence of intake air in the intake passages can be avoided.

(subsidiary item 4)

In the intake device for an internal combustion engine having the receiving recess, the 2 nd bearing portion further has a protrusion portion provided on an outer surface facing the receiving recess, the receiving recess is formed at a position corresponding to the protrusion portion, and has an insertion recess into which a part of the protrusion portion is inserted, and a bypass diameter portion is provided between the plurality of intake passages by inserting a part of the protrusion portion into the insertion recess.

With such a configuration, air is less likely to leak between adjacent ones of the plurality of intake passages, and therefore, turbulence of intake air in the intake passages can be avoided.

(subsidiary item 5)

In the intake device for an internal combustion engine according to the above-described aspect, the rotary shaft has a rotary shaft-side protrusion, the 1 st bearing portion has a receiving-side recess formed at a position corresponding to the rotary shaft-side protrusion, and the valve element is positioned in the axial direction by engaging the rotary shaft-side protrusion with the receiving-side recess in a state where the 2 nd bearing portion is press-fitted into the 1 st bearing portion.

With such a configuration, since the rotational shaft can be prevented from wobbling in the axial direction, abnormal noise caused by wobbling of the rotational shaft can be prevented.

(subsidiary item 6)

In the intake device for an internal combustion engine according to the above-described aspect, the rotary shaft has a rotary shaft-side protrusion, the 1 st bearing portion has a receiving-side recess formed at a position corresponding to the rotary shaft-side protrusion, and the rotary shaft-side protrusion engages with the receiving-side recess in a state where the 2 nd bearing portion is press-fitted into the 1 st bearing portion, thereby restricting the valve body from rotating in the circumferential direction in the axial direction.

With such a configuration, the valve body can be prevented from completely closing the intake passage, and therefore, air can be reliably taken into the combustion chamber.

(subsidiary item 7)

In the intake device for an internal combustion engine provided with the convex portion and the concave portion, the 1 st direction is a direction orthogonal to the axial direction and the 2 nd direction along the protruding direction of the convex portion, the 1 st positioning surface of the convex portion has a pair of outer side surfaces in the 1 st direction, the 2 nd positioning surface of the concave portion has a pair of inner side surfaces in the 1 st direction, the 1 st positioning surface of the convex portion has a tip surface on the 2 nd direction side, the 2 nd positioning surface of the concave portion has a bottom surface opposite to the tip surface, the 1 st bearing portion and the 2 nd bearing portion perform positioning in the 1 st direction by abutment of the pair of outer side surfaces and the pair of inner side surfaces, and perform positioning in the 2 nd direction by abutment of the tip surface and the bottom surface.

With this configuration, the positioning in the 1 st direction is performed by the contact between the pair of outer side surfaces and the pair of inner side surfaces, and the positioning in the 2 nd direction is performed by the contact between the distal end surface and the bottom surface, whereby the positioning of the 2 nd bearing part with respect to the 1 st bearing part is not required to be performed using a dedicated jig. As a result, the 2 nd bearing can be easily positioned with respect to the 1 st bearing.

(subsidiary item 8)

The present invention according to another aspect provides a method of manufacturing an intake device for an internal combustion engine, including: the method includes the steps of forming an intake device body including a plurality of intake passages for supplying intake air to a combustion chamber, integrally forming a 1 st bearing portion and a 2 nd bearing portion, the 1 st bearing portion supporting a rotary shaft so that the rotary shaft of a valve body provided in the intake device body is rotatable, and the 2 nd bearing portion supporting the rotary shaft together with the 1 st bearing portion, and pressing the 2 nd bearing portion into the 1 st bearing portion from one side in an axial direction extending from a rotation axis of the rotary shaft.

In the method of manufacturing the intake apparatus for an internal combustion engine according to the present invention, as described above, the step of press-fitting the 2 nd bearing portion into the 1 st bearing portion from the side in the axial direction in which the rotation axis of the rotation shaft extends is provided. Thus, since the rotation shaft is held in the state where the 2 nd bearing is press-fitted into the 1 st bearing, a gap can be made less likely to be formed between the 1 st bearing and the 2 nd bearing, and therefore, even if a load is applied to the valve body in the intake air flow direction due to a differential pressure between the intake passage and the combustion chamber, the 2 nd bearing can be suppressed from moving in one direction in the radial direction of the rotation shaft. As a result, the increase of the gap (clearance) on the other side in the radial direction of the rotating shaft in the gap (clearance) between the rotating shaft and the bearing formed by the 1 st bearing portion and the 2 nd bearing portion can be suppressed, and therefore, the method of manufacturing the intake device for the internal combustion engine can be obtained in which the rattling of the rotating shaft can be suppressed. Further, since the 1 st bearing part and the 2 nd bearing part can be formed in the same environment by integrally forming the 1 st bearing part and the 2 nd bearing part, variation in the size of the 1 st bearing part and the 2 nd bearing part can be suppressed. Further, compared to the case where the 1 st bearing portion and the 2 nd bearing portion are formed separately, the number of manufacturing steps can be reduced by integrally forming the 1 st bearing portion and the 2 nd bearing portion.

Drawings

Fig. 1 is a cross-sectional view showing an engine including an intake manifold according to a first embodiment.

Fig. 2 is an exploded perspective view of the intake manifold of the first embodiment.

Fig. 3 is a perspective view illustrating the 1 st bearing portion and the 2 nd bearing portion of the intake manifold according to the first embodiment.

Fig. 4 is a plan view showing the 1 st bearing portion and the 2 nd bearing portion of the intake manifold according to the first embodiment.

Fig. 5 is an exploded perspective view illustrating the 1 st bearing portion and the 2 nd bearing portion of the intake manifold according to the first embodiment.

Fig. 6 is a side view of portion E of fig. 4.

Fig. 7 is an exploded perspective view illustrating a 1 st bearing portion and a 2 nd bearing portion of an intake manifold according to a second embodiment.

Fig. 8 is a cross-sectional view illustrating the 1 st and 2 nd bearing portions of the intake manifold according to the second embodiment.

Fig. 9 is a cross-sectional view showing an engine including an intake manifold according to a third embodiment.

Fig. 10 is a cross-sectional view taken along line 101-101 of fig. 9.

Fig. 11 is a cross-sectional view showing a state in which the 2 nd bearing portion is offset from the 1 st bearing portion of the intake manifold according to the third embodiment.

Fig. 12 is a sectional view of an engine including an intake manifold according to the fourth embodiment.

Fig. 13 is a sectional view taken along line 102 of fig. 12.

Fig. 14 is an exploded perspective view illustrating a 1 st bearing portion and a 2 nd bearing portion of an intake manifold according to a first modification of the fourth embodiment.

Fig. 15 is a sectional view taken along line 103-103 of fig. 14.

Fig. 16 is an exploded perspective view illustrating a 1 st bearing portion and a 2 nd bearing portion of an intake manifold according to a second modification of the fourth embodiment.

Fig. 17 is a cross-sectional view taken along line 104 of fig. 16.

Fig. 18 is a cross-sectional view illustrating a 1 st bearing portion and a 2 nd bearing portion of an intake manifold according to a fifth embodiment.

Fig. 19 is a sectional view taken along line 105-105 of fig. 18.

Fig. 20 is an exploded perspective view illustrating a 1 st bearing portion and a 2 nd bearing portion of an intake manifold according to a fifth embodiment.

Fig. 21 is a plan view showing a 1 st bearing portion and a 2 nd bearing portion of an intake manifold according to a sixth embodiment.

Fig. 22 is a cross-sectional view taken along line 106-106 of fig. 21.

Fig. 23 is an enlarged view of a portion F of fig. 22.

Fig. 24 is a plan view showing the 1 st and 2 nd bearing portions of the intake manifold of the seventh embodiment.

Fig. 25 is a cross-sectional view taken along line 107-107 of fig. 24.

Fig. 26 is a cross-sectional view taken along line 108-108 of fig. 25.

Fig. 27 is a sectional view of an engine including an intake manifold according to the eighth embodiment.

Fig. 28 is a sectional view taken along line 109-109 of fig. 27.

Fig. 29 is a sectional view taken along line 110-110 of fig. 28.

Fig. 30 is a sectional view showing an intake manifold according to a modification of the eighth embodiment.

Fig. 31 is a cross-sectional view showing an engine including an intake manifold according to the ninth embodiment.

Fig. 32 is a sectional view taken along line 111-111 of fig. 31.

Fig. 33 is a sectional view taken along line 112-112 of fig. 32.

Fig. 34 is a plan view showing a molded body of the 1 st bearing portion and a molded body of the 2 nd bearing portion in the tenth embodiment.

Fig. 35 is a side view showing a molded body of the 1 st bearing portion and a molded body of the 2 nd bearing portion in the tenth embodiment.

Fig. 36 is a flowchart showing a method of manufacturing an intake manifold according to the tenth embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

[ first embodiment ]

Referring to fig. 1 to 6, a configuration of an intake manifold 2 (an example of an "intake apparatus for an internal combustion engine" according to an embodiment of the present invention) provided in an engine 100 (an example of an "internal combustion engine" according to an embodiment of the present invention) will be described.

As shown in fig. 1 and 2, an engine 100 for a vehicle (automobile) is configured to rotate a crankshaft by successively repeating one cycle of intake, compression, expansion (combustion), and exhaust by reciprocating pistons in a plurality of (4) cylinders 12 extending in the vertical direction, respectively, as shown in fig. 1.

Here, in engine 100, a direction in which a plurality of cylinders 12 are arranged is referred to as an X direction, and a direction orthogonal to the X direction in a horizontal direction is referred to as a Y direction. In engine 100, a direction (extending direction of cylinder 12) orthogonal to the X direction and the Y direction is defined as a Z direction (vertical direction).

Specifically, the engine 100 includes an engine main body 1 (an example of "an internal combustion engine main body" according to an embodiment of the present invention) and an intake manifold 2. The engine body 1 includes a cylinder block 3, a cylinder head 4, and a head cover 5. The cylinder head 4 is fastened to the upper surface (Z1 side) of the cylinder block 3. The head cover 5 covers and is fastened to an upper portion of the cylinder head 4.

An intake valve 7 and an exhaust valve 8 that are periodically opened and closed in accordance with rotation of the camshaft 6, and an ignition plug are assembled in the cylinder head 4. The cylinder head 4 has a combustion chamber 9, an intake port 10 that sends intake air (intake air) into the combustion chamber 9, and an exhaust port 11 that discharges combustion exhaust gas. Fig. 1 shows a cross-sectional view of one cylinder 12 of the plurality of (4) cylinders 12, and the other cylinders 12 have the same configuration.

The intake manifold 2 is connected to a cylinder head 4. The intake manifold 2 includes an intake device main body 2a, a tumble flow control valve 2b (an example of a "valve element" in the present embodiment), and a bearing 2 c.

The intake device main body 2a is configured to supply air into the combustion chamber 9. Specifically, the intake device main body 2a includes a surge tank (not shown) and a plurality of (4) intake pipe portions 2 d. The surge tank and the plurality of intake pipe portions 2d are integrally formed of a resin material. The buffer tank is configured to temporarily store air. The plurality of intake pipe portions 2d are disposed downstream of the surge tank. An intake passage 2e for communicating an internal space (not shown) of the surge tank with the combustion chamber 9 is formed in the plurality of intake pipe portions 2 d. The intake passage 2e communicates with the intake port 10.

The tumble flow control valve 2b is configured to control the flow of intake air in the intake passage 2 e. The tumble flow control valve 2b is provided so as to be rotatable in a closing direction that closes the intake passage 2e and in an opening direction that opens the intake passage 2 e. The tumble flow control valve 2b is disposed on the upstream side inside the intake pipe portion 2 d. That is, the tumble flow control valve 2b is provided in the intake device main body 2 a.

The tumble flow control valve 2b includes a rotating shaft 2f and a plurality of (4) valve portions 2 g. The rotation shaft 2f extends in the X direction. The rotating shaft 2f is formed of a resin material. The rotary shaft 2f connects the valve portions 2g adjacent in the X direction to each other. The rotating shaft 2f is rotatably mounted with respect to the bearing 2 c. An actuator 2h and a sensor 2i are attached to one end and the other end of the rotating shaft 2 f. The actuator 2h adjusts the opening degree of the tumble flow control valve 2b by rotating the rotating shaft 2 f. The sensor 2i is configured to detect the rotation state of the tumble control valve 2 b. Then, the rotation angle (rotation state) of the tumble control valve 2b is changed according to the output of the sensor 2i, the operating condition of the engine 100, and the like.

Since the plurality of valve portions 2g have the same structure, only the structure of one valve portion 2g will be described. The valve portion 2g has a valve main body 2j and a pair of connecting portions 2 k. The valve body 2j has a so-called airfoil sectional shape on the Y-Z plane. The pair of connecting portions 2k are disposed at both ends of the valve main body 2j in the X direction. The pair of connecting portions 2k connect the valve main body 2j and the rotating shaft 2 f.

(Bearings)

The bearing 2c is configured to rotatably support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 2c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 22, and a plurality of (3) 2 nd bearing portions 23.

The plurality of insertion pipe portions 21 are inserted into the end portions of the plurality of intake pipe portions 2d on the downstream side in the intake air flow direction. The plurality of insertion pipe portions 21 are provided corresponding to the plurality of intake pipe portions 2 d. The plurality of insertion pipe portions 21 are inserted into the plurality of intake pipe portions 2d, and form an intake passage 2e at the downstream end in the intake air flow direction together with the plurality of intake pipe portions 2 d.

As shown in fig. 3 and 4, the 1 st bearing portion 22 rotatably supports the rotating shaft 2 f. The 2 nd bearing portion 23 rotatably supports the rotating shaft 2f so that the rotating shaft 2f can rotate. The plurality of 1 st bearing portions 22 and the plurality of 2 nd bearing portions 23 are disposed at the partition portion 24 (see fig. 2). The partition portion 24 is a portion between the plurality of intake passages 2e, and is a portion of the intake device main body 2a at the end portion on the downstream side in the intake air flow direction. A pair of the 1 st bearing part 22 and the 2 nd bearing part 23 is disposed in the partition part 24. The plurality of 1 st bearing portions 22 are provided integrally with the plurality of insertion tube portions 21. Thereby, the plurality of 1 st bearing parts 22 are attached to the plurality of intake pipe parts 2d via the plurality of insertion pipe parts 21. The plurality of 2 nd bearing portions 23 are attached to the plurality of 1 st bearing portions 22. The plurality of 1 st bearing portions 22 are disposed downstream (Y2 direction side) of the plurality of 2 nd bearing portions 23 in the intake flow direction.

The plurality of 1 st bearing portions 22 are formed by resin molding. Further, the plurality of 2 nd bearing portions 23 are formed by resin molding.

Since the plurality of 1 st bearing portions 22 have the same structure and the plurality of 2 nd bearing portions 23 have the same structure, only one set of the 1 st bearing portions 22 and the 2 nd bearing portions 23 arranged in the portion E of fig. 4 will be described below.

(1 st bearing part and 2 nd bearing part)

As shown in fig. 5 and 6, the 2 nd bearing portion 23 of the first embodiment is configured such that: in a state where the turning shaft 2f is rotatably supported by the turning shaft 2f, the relative movement thereof in the Y direction (intake air flow direction) with respect to the 1 st bearing portion 22 is restricted. That is, the 2 nd bearing part 23 supports the rotating shaft 2 together with the 1 st bearing part 22 in a state where the 1 st bearing part 22 is press-fitted from the X2 direction side (an example of "one direction side of the axial direction in which the rotation axis of the rotating shaft extends"). Here, the 2 nd bearing portion 23 is pushed into the 1 st bearing portion 22 by sliding movement from the X2 direction side. Thus, the 2 nd bearing 23 engages with the 1 st bearing 22 in the Y direction. Furthermore, the method is simple. The 2 nd bearing portion 23 is engaged with the 1 st bearing portion 22 so as to be movable in the X direction.

Specifically, the 1 st bearing portion 22 has a convex portion 22 a. The convex portion 22a protrudes toward the 2 nd bearing portion 23 side. Specifically, the 1 st bearing portion 22 is provided with the 1 st convex portion 22b as the convex portion 22a protruding in the Z1 direction. The 1 st bearing portion 22 is provided with a 2 nd convex portion 22c as a convex portion 22a protruding in the Z2 direction. The 2 nd bearing portion 23 has a concave portion 23a provided to correspond to the convex portion 22a of the 1 st bearing portion 22. Specifically, the 2 nd bearing portion 23 is provided with a 1 st recessed portion 23b which is a recessed portion 23a recessed in the Z1 direction and is provided corresponding to the 1 st raised portion 22 b. The 2 nd bearing portion 23 is provided with a 2 nd recessed portion 23c as a recessed portion 23a recessed in the Z2 direction, which is provided corresponding to the 2 nd raised portion 22 c.

Here, the concave portion 23a is press-fitted into the convex portion 22a, and thereby the 1 st bearing portion 22 and the 2 nd bearing portion 23 are positioned in the Y direction (an example of the "1 st direction" in the present invention). Specifically, the 1 st convex portion 22b and the 1 st concave portion 23b are dimensional tolerances of interference fit in the Y direction. The 2 nd convex portion 22c and the 2 nd concave portion 23c are dimensional tolerances of interference fit in the Y direction.

That is, the 1 st bearing portion 22 has the 1 st positioning surface 31. The 1 st positioning surface 31 is provided on the 1 st projection 22b and the 2 nd projection 22 c. Specifically, the 1 st positioning surface 31 is a pair of 1 st outer surfaces 31a (an example of "a pair of outer surfaces" in the present embodiment) in the Y direction of the 1 st projecting portion 22 b. The 1 st positioning surface 31 is a pair of 2 nd outer side surfaces 31b (an example of "a pair of outer side surfaces" in the present embodiment) in the Y direction of the 2 nd convex portion 22 c. The 2 nd positioning surface 32 is provided in the 1 st recess 23b and the 2 nd recess 23 c. Specifically, the 2 nd positioning surface 32 is a pair of 1 st inner side surfaces 32a (an example of "a pair of inner side surfaces" in the present embodiment) in the Y direction of the 1 st concave portion 23 b. The 2 nd positioning surface 32 is a pair of 2 nd inner side surfaces 32b (an example of "a pair of inner side surfaces" in the embodiment of the present invention) in the Y direction of the 2 nd recessed portion 23 c.

The 1 st positioning surface 31 and the 2 nd positioning surface 32 are brought into contact with each other, whereby the 1 st bearing 22 and the 2 nd bearing 23 are positioned in the Y direction. Specifically, the pair of 1 st outer surfaces 31a of the 1 st convex portion 22b and the pair of 1 st inner surfaces 32a of the 1 st concave portion 23b abut. The pair of 2 nd outer surfaces 31b of the 2 nd convex portion 22c and the pair of 2 nd inner surfaces 32b of the 2 nd concave portion 23c abut. That is, the 1 st bearing part 22 and the 2 nd bearing part 23 are positioned in the Y direction by the contact between the pair of 1 st outer surfaces 31a and the pair of 1 st inner surfaces 32 a. The 1 st bearing part 22 and the 2 nd bearing part 23 are positioned in the Y direction by the contact between the pair of 2 nd outer surfaces 31b and the pair of 2 nd inner surfaces 32 b.

Further, the 1 st bearing portion 22 and the 2 nd bearing portion 23 are also positioned in the Z direction. Here, the 1 st convex portion 22b and the 1 st concave portion 23b are dimensional tolerances of clearance fit in the Z1 direction. The 2 nd convex portion 22c and the 2 nd concave portion 23c are dimensional tolerances of clearance fit in the Z2 direction. That is, the 1 st bearing 22 and the 2 nd bearing 23 are press-fitted in the Y direction but are not press-fitted in the Z direction.

That is, the 1 st outer surface 31a on the Y1 direction side of the pair of 1 st outer surfaces 31a has the 1 st projecting portion 122a (an example of the "projecting portion" in the embodiment of the present invention). The 1 st protruding portion 122a protrudes toward the 1 st inner side surface 32a on the Y1 direction side (an example of the "protruding direction" in the embodiment of the present invention) opposite to the pair of 1 st inner side surfaces 32 a. The 2 nd outer surface 31b on the Y1 direction side of the pair of 2 nd outer surfaces 31b has the 2 nd projecting portion 122b (an example of the "projecting portion" in the embodiment of the present invention). The 2 nd projecting portion 122b projects toward the 2 nd inner surface 32b on the opposite Y1 direction side of the pair of 2 nd inner surfaces 32 b. The 1 st projection 122a and the 2 nd projection 122b extend in the X direction.

The 1 st insertion recess 123a (an example of the "insertion recess" in the present embodiment) is formed in the 1 st inner surface 32a on the Y1 direction side of the pair of 1 st inner surfaces 32 a. The 1 st insertion recess 123a is formed corresponding to the 1 st protrusion 122a, and is configured to be inserted by the 1 st protrusion 122 a. Specifically, the 1 st insertion recess 123a is formed by recessing the 1 st inner surface 32a on the Y1 direction side in the Y1 direction. The 2 nd insertion recess 123b (an example of the "insertion recess" in the present embodiment) is formed in the 2 nd inner surface 32b on the Y1 direction side of the pair of 2 nd inner surfaces 32 b. The 2 nd insertion recess 123b is formed corresponding to the 2 nd protrusion 122b, and is configured to be inserted by the 2 nd protrusion 122 b. Specifically, the 2 nd insertion recess 123b is formed by recessing the 2 nd inner surface 32b on the Y1 direction side in the Y1 direction. The 1 st insertion recess 123a and the 2 nd insertion recess 123b extend in the X direction.

(Effect of the first embodiment)

In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the intake manifold 2 is provided with the 1 st bearing portion 22, and the 1 st bearing portion 22 is provided in the intake device main body 2a and supports the rotary shaft 2f so that the rotary shaft 2f can rotate. The intake manifold 2 is provided with a 2 nd bearing portion 23, and the 2 nd bearing portion 23 supports the rotating shaft 2f together with the 1 st bearing portion 22 in a state where the 1 st bearing portion 22 is press-fitted from the X2 direction side. Thus, since the gap is not easily formed between the 1 st bearing part 22 and the 2 nd bearing part 23 by holding the rotating shaft 2f in a state where the 2 nd bearing part 23 is press-fitted into the 1 st bearing part 22, even if a load is applied to the valve body in the intake air flow direction due to a differential pressure between the intake passage 2e and the combustion chamber 9, the 2 nd bearing part 23 can be suppressed from moving in one direction side in the radial direction of the rotating shaft 2 f. As a result, the gap (gap) between the rotating shaft 2f and the bearing portion formed by the 1 st bearing portion 22 and the 2 nd bearing portion 23 on the other radial direction side of the rotating shaft 2f can be suppressed from increasing, and thus, the wobbling of the rotating shaft 2f can be suppressed. Further, since the wobbling of the rotating shaft 2f can be suppressed, the sound generated by the wobbling of the rotating shaft 2f can be suppressed. Further, since the rotating shaft 2f is held in a state where the 2 nd bearing part 23 is press-fitted into the 1 st bearing part 22, a gap is not easily formed between the 1 st bearing part 22 and the 2 nd bearing part 23, and therefore, the inner diameter of the bearing 2c formed by the 1 st bearing part 22 and the 2 nd bearing part 23 can be kept constant. As a result, it is not easy to reduce the size of the bearing 2c from the optimum size, and therefore, it is possible to suppress an increase in the sliding resistance of the bearing 2c against the rotating shaft 2f due to the reduction in the size of the bearing 2c from the optimum size.

In the first embodiment, as described above, the 1 st positioning surface 31 is provided on the 1 st bearing portion 22. The 2 nd bearing portion 23 is provided with a 2 nd positioning surface 32. The 1 st positioning surface 31 and the 2 nd positioning surface 32 are brought into contact with each other, whereby the 1 st bearing 22 and the 2 nd bearing 23 are positioned in the Y direction. Accordingly, when the 1 st bearing part 23 is press-fitted into the 1 st bearing part 22, the 1 st positioning surface 31 and the 2 nd positioning surface 32 not only make it difficult to form a gap between the 1 st bearing part 22 and the 2 nd bearing part 23, but also make it possible to set the inner diameter of the bearing 2c formed by the 1 st bearing part 22 and the 2 nd bearing part 23 to a more appropriate size by positioning the 1 st bearing part 22 and the 2 nd bearing part 23 in the 1 st direction. As a result, the gap (clearance) between the rotating shaft 2f and the bearing formed by the 1 st bearing 22 and the 2 nd bearing 23 can be further suppressed from increasing, and thus the play of the rotating shaft 2f can be further suppressed.

In the first embodiment, as described above, the convex portion 22a is provided in the 1 st bearing portion 22, and the 1 st positioning surface 31 is provided on the convex portion 22a so as to protrude toward the 2 nd bearing portion 23. A recessed portion 23a is provided in the 2 nd bearing portion 23, and the recessed portion 23a is provided with a 2 nd positioning surface 32 and is provided corresponding to the convex portion 22 a. The positioning of the 1 st bearing 22 and the 2 nd bearing 23 in the Y direction is performed by press-fitting the concave portion 23a into the convex portion 22 a. Thus, the 1 st bearing part 22 provided with the 1 st positioning surface 31 and the 2 nd bearing part 23 provided with the 2 nd positioning surface 32 can be formed with a simple structure by the convex portion 22a and the concave portion 23a, and therefore, complication of the structure of the intake manifold 2 can be suppressed.

In the first embodiment, as described above, the pair of 1 st outer side surfaces 31a and the pair of 1 st inner side surfaces 32a are brought into contact with each other, and the pair of 2 nd outer side surfaces 31b and the pair of 2 nd inner side surfaces 32b are brought into contact with each other, whereby the 1 st bearing 22 and the 2 nd bearing 23 are positioned in the Y direction, and the 1 st protruding portion 122a and the 1 st insertion recess 123a are engaged with each other, and the 2 nd protruding portion 122b and the 2 nd insertion recess 123b are engaged with each other, whereby the 1 st bearing 22 and the 2 nd bearing 23 are positioned in the Z direction. Thus, unlike the case where positioning in the Z direction is performed by bringing the pair of outer side surfaces into contact with the pair of inner side surfaces in the Z direction, positioning in the Z direction is performed by engaging the 1 st protruding portion 122a with the 1 st insertion recess portion 123a and engaging the 2 nd protruding portion 122b with the 2 nd insertion recess portion 123b, and a gap can be provided between the 1 st bearing portion 22 and the 2 nd bearing portion 23 in the Z direction, and therefore, the 2 nd bearing portion 23 can be prevented from receiving the repulsive force from the 1 st bearing portion 22 in the Z direction. Therefore, the deformation of the 2 nd bearing part 23 due to the repulsive force can be avoided, and thus the change in the shape of the inner diameter of the bearing 2c formed by the 1 st bearing part 22 and the 2 nd bearing part 23 can be suppressed. As a result, since the shape of the inner diameter of the bearing 2c can be prevented from changing, the wobbling of the rotating shaft 2f can be prevented.

[ second embodiment ]

Next, the structure of the intake manifold 202 according to the second embodiment of the present invention will be described with reference to fig. 7 and 8. Unlike the intake manifold 2 of the first embodiment which includes the bearing 2c in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are press-fitted in the Y direction but are not press-fitted in the Z direction, the second embodiment describes an example of the intake manifold 202 which includes the bearing 202c in which the 1 st bearing portion 222 and the 2 nd bearing portion 223 are press-fitted in the Y direction and are also press-fitted in the Z direction. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 7 and 8, an intake manifold 202 (an example of the "intake device for an internal combustion engine" according to the present invention) of the second embodiment includes an intake device main body 2a, a tumble flow control valve 2b (an example of the "valve body" according to the present invention), and a bearing 202 c.

(Bearings)

The bearing 202c is configured to support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 202c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 222, and a plurality of (3) 2 nd bearing portions 223.

Since each of the plurality of 1 st bearing portions 222 has the same structure and each of the plurality of 2 nd bearing portions 223 has the same structure, only one set of the 1 st bearing portions 222 and the 2 nd bearing portions 223 will be described below.

(1 st bearing part and 2 nd bearing part)

The second bearing portion 2 223 of the second embodiment is configured to be restricted from moving relative to the first bearing portion 1 222 in the Y direction in a state where the rotating shaft 2f is rotatably supported by the rotating shaft 2 f.

Specifically, the 1 st bearing portion 222 includes the 1 st convex portion 22b and the 2 nd convex portion 22 c. The 2 nd bearing portion 223 has a 1 st recess 23b and a 2 nd recess 23 c.

The 1 st bearing portion 222 has a 1 st positioning surface 31. The 1 st positioning surface 31 is provided on the 1 st projection 22b and the 2 nd projection 22 c. Specifically, the 1 st positioning surface 31 is a pair of 1 st outer surfaces 31a (an example of "a pair of outer surfaces" in the present embodiment) in the Y direction of the 1 st projecting portion 22 b. The 1 st positioning surface 31 is a 1 st leading end surface 222a on the Z1 direction side of the 1 st projection 22 b. The 1 st positioning surface 31 is a pair of 2 nd outer side surfaces 31b (an example of "a pair of outer side surfaces" in the embodiment of the present invention) in the Y direction of the 2 nd convex portion 22 c. The 1 st positioning surface 31 is a 2 nd leading end surface 222b on the Z2 direction side of the 2 nd projection 22 c.

The 2 nd positioning surface 32 is provided in the 1 st recess 23b and the 2 nd recess 23 c. Specifically, the 2 nd positioning surface 32 is a pair of 1 st inner side surfaces 32a (an example of "a pair of inner side surfaces" in the present embodiment) in the Y direction of the 1 st concave portion 23 b. The 2 nd positioning surface 32 is a 1 st bottom surface 223a opposed to the 1 st leading end surface 222 a. The 2 nd positioning surface 32 is a pair of 2 nd inner side surfaces 32b (an example of "a pair of inner side surfaces" in the embodiment of the present invention) in the Y direction of the 2 nd recessed portion 23 c. The 2 nd positioning surface 32 is a 2 nd bottom surface 223b opposed to the 2 nd leading end surface 222 b.

Here, the 1 st convex portion 22b and the 1 st concave portion 23b are dimensional tolerances of interference fit in the Y direction and the Z direction. The 2 nd convex portion 22c and the 2 nd concave portion 23c are dimensional tolerances of interference fit in the Y direction and the Z direction. Thus, the 1 st bearing portion 222 and the 2 nd bearing portion 223 are positioned in the Y direction (an example of the "1 st direction" in the embodiment of the present invention) and the Z direction (an example of the "2 nd direction" in the embodiment of the present invention) by press-fitting the concave portion 23a into the convex portion 22 a.

Specifically, the pair of 1 st outer side surfaces 31a and the pair of 1 st inner side surfaces 32a are brought into contact with each other, and the pair of 2 nd outer side surfaces 31b and the pair of 2 nd inner side surfaces 32b are brought into contact with each other, whereby the 1 st bearing portion 222 and the 2 nd bearing portion 223 are positioned in the Y direction. Further, the 1 st distal end surface 222a is brought into contact with the 1 st bottom surface 223a, and the 2 nd distal end surface 222b is brought into contact with the 2 nd bottom surface 223b, whereby the 1 st bearing portion 222 and the 2 nd bearing portion 223 are positioned in the Z direction. The other structure of the intake manifold 202 of the second embodiment is the same as that of the intake manifold 2 of the first embodiment, and therefore, the description thereof is omitted.

(Effect of the second embodiment)

The effect of the second embodiment will be explained.

In the second embodiment, as described above, the 1 st bearing portion 222 and the 2 nd bearing portion 223 are provided in the intake manifold 202. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing formed by the 1 st bearing portion 222 and the 2 nd bearing portion 223, and thus can suppress rattling of the rotating shaft 2 f.

In the second embodiment, as described above, the pair of 1 st outer side surfaces 31a and the pair of 1 st inner side surfaces 32a are brought into contact with each other, and the pair of 2 nd outer side surfaces 31b and the pair of 2 nd inner side surfaces 32b are brought into contact with each other, whereby the 1 st bearing portion 222 and the 2 nd bearing portion 223 are positioned in the Y direction, and the 1 st tip end surface 222a and the 1 st bottom surface 223a are brought into contact with each other, and the 2 nd tip end surface 222b and the 2 nd bottom surface 223b are brought into contact with each other, whereby the 1 st bearing portion 222 and the 2 nd bearing portion 223 are positioned in the Z direction. This eliminates the need to use a dedicated jig for positioning the 2 nd bearing part 223 with respect to the 1 st bearing part 222. As a result, the 2 nd bearing portion 223 can be easily positioned with respect to the 1 st bearing portion 222. Other effects of the second embodiment are the same as those of the first embodiment.

[ third embodiment ]

Next, the structure of the intake manifold 302 according to the third embodiment of the present invention will be described with reference to fig. 9 to 11. In contrast to intake manifold 2 of the first embodiment in which 1 st bearing 22 and 2 nd bearing 23 are housed in partition 24, in the third embodiment, an example of intake manifold 302 in which a retaining mechanism for 1 st bearing 22 and 2 nd bearing 23 is provided in partition 24 will be described. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 9 and 10, an intake manifold 302 (an example of the "intake device for an internal combustion engine" according to the present invention) of the third embodiment includes an intake device main body 302a, a tumble flow control valve 2b (an example of the "valve body" according to the present invention), and a bearing 2 c. The intake device main body 302a includes an accommodation recess 325 disposed between the plurality of intake passages 2 e. The accommodation recess 325 is configured to accommodate the 2 nd bearing portion 23. In the housing recess 325, the partition portion 24 is recessed on the side opposite to the intake air flow direction with respect to the intake air flow direction.

(Bearings)

The bearing 2c is configured to rotatably support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 2c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 22, and a plurality of (3) 2 nd bearing portions 23.

Since each of the plurality of 1 st bearing portions 22 has the same structure as the 1 st bearing portion 22 and each of the plurality of 2 nd bearing portions 23 has the same structure as the 2 nd bearing portion 23, only one set of the 1 st bearing portion 22 and the 2 nd bearing portion 23 will be described below.

(1 st bearing part and 2 nd bearing part)

The 2 nd bearing portion 23 of the third embodiment is housed in the housing recess 325 in a state in which the movement thereof in the X direction is restricted. That is, the 2 nd bearing 23 is held between the pair of inner side surfaces 325a of the holding recess 325. Specifically, in the X direction, the gap between the 2 nd bearing portion 23 and the accommodating recess 325 has a dimension smaller than the interference between the 1 st bearing portion 22 and the 2 nd bearing portion 23. Therefore, as shown in fig. 11, even if the 2 nd bearing 23 moves in the X2 direction, the movement of the 2 nd bearing 23 in the X2 direction is restricted by the inner side surface 325a on the X2 direction side of the housing recess 325. The other structure of the intake manifold 302 according to the third embodiment is the same as that of the intake manifold 2 according to the first embodiment, and therefore, the description thereof is omitted.

(Effect of the third embodiment)

The effect of the third embodiment will be described.

In the third embodiment, as described above, the 1 st bearing portion 22 and the 2 nd bearing portion 23 are provided in the intake manifold 302. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing formed by the 1 st bearing portion 22 and the 2 nd bearing portion 23, and thus can suppress rattling of the rotating shaft 2 f.

In the third embodiment, as described above, the housing recess 325 disposed between the plurality of intake passages 2e is provided in the intake device main body 302 a. The accommodation recess 325 accommodates the 2 nd bearing 23 with the 2 nd bearing 23 sandwiched between the pair of inner side surfaces 325a of the accommodation recess 325. Accordingly, even if the 2 nd bearing 23 moves in the X direction, the movement of the 2 nd bearing 23 can be restricted by the pair of inner side surfaces 325a of the accommodating recess 325, and therefore, the 2 nd bearing 23 can be prevented from coming off the 1 st bearing 22. Other effects of the third embodiment are the same as those of the first embodiment.

[ fourth embodiment ]

Next, the structure of an intake manifold 402 according to a fourth embodiment of the present invention will be described with reference to fig. 12 and 13. Unlike the intake manifold 2 of the first embodiment in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are housed in the partition portion 24, in the fourth embodiment, an example of the intake manifold 402 in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are positioned in the housing recess portion 425 will be described. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 12 and 13, an intake manifold 402 (an example of the "intake device for an internal combustion engine" according to the present invention) of the fourth embodiment includes an intake device main body 402a, a tumble flow control valve 2b (an example of the "valve body" according to the present invention), a bearing 2c, and a positioning portion 420. The intake device main body 402a includes a housing recess 425 disposed between the plurality of intake passages 2 e. The accommodating recess 425 is configured to accommodate the 2 nd bearing 23. In the housing recess 425, the partition portion 24 is recessed on the side opposite to the intake air flow direction with respect to the intake air flow direction.

(Bearings)

The bearing 2c is configured to rotatably support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 2c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 22, and a plurality of (3) 2 nd bearing portions 23.

(positioning part)

The positioning portion 420 is configured to position the 2 nd bearing portion 23 with respect to the 1 st bearing portion 22 in the X direction in a state where the 2 nd bearing portion 23 is press-fitted into the 1 st bearing portion 22. Here, the positioning portion 420 is a housing recess 425. Specifically, the size of the accommodating recess 425 is substantially the same as the size of the 2 nd bearing 23 in the X direction. Further, in the X direction, the housing recess 425 is formed to correspond to a desired arrangement position of the 2 nd bearing portion 23. Further, in order to guide the 2 nd bearing portion 23 to a desired arrangement position, a pair of edge portions on the intake air flow direction side of the housing concave portion 425 have a tapered shape.

(Effect of the fourth embodiment)

The effect of the fourth embodiment will be described.

In the fourth embodiment, as described above, the 1 st bearing portion 22 and the 2 nd bearing portion 23 are provided in the intake manifold 402. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing formed by the 1 st bearing portion 22 and the 2 nd bearing portion 23, and thus can suppress rattling of the rotating shaft 2 f.

In the fourth embodiment, as described above, the positioning portion 420 is provided in the intake manifold 402, and the 2 nd bearing portion 23 is positioned with respect to the 1 st bearing portion 22 in the X direction of the positioning portion 420 in a state where the 2 nd bearing portion 23 is press-fitted into the 1 st bearing portion 22. Thus, by positioning the 2 nd bearing 23 with respect to the 1 st bearing 22 by the positioning portion 420, the 2 nd bearing 23 can be disposed at an appropriate position with respect to the 1 st bearing 22, and thus an appropriate press-fitting margin (length of a press-fitting portion) between the 1 st bearing 22 and the 2 nd bearing 23 can be secured. As a result, the holding force for the rotating shaft 2f can be ensured appropriately. Other effects of the fourth embodiment are the same as those of the first embodiment.

(modification example)

The positioning portion 420 may be formed not only in the accommodation recess 425 but also in the 1 st bearing portion 22 and the 2 nd bearing portion 23 in the manner described below.

As in the first modification of the fourth embodiment shown in fig. 14 and 15, the 1 st concave portion 523a of the 2 nd bearing portion 523 has the 1 st abutment surface 523c on the X2 direction side. The 1 st abutment surface 523c is an inner surface of the 1 st concave portion 523 a. The 2 nd recessed portion 523b of the 2 nd bearing portion 523 has a 2 nd abutment surface 523d on the X2 direction side. The 2 nd abutment surface 523d is an inner surface of the 2 nd recessed portion 523 b. When the 1 st convex portion 22b is inserted into the 1 st concave portion 523a, the 1 st abutment surface 523c abuts against the outer side surface of the 1 st convex portion 22b on the X2 direction side from the X2 direction side. When the 2 nd convex portion 22c is inserted into the 2 nd concave portion 523b, the 2 nd abutment surface 523d abuts against the outer surface of the 2 nd convex portion 22c on the X2 direction side from the X2 direction side. Thereby, the 2 nd bearing portion 523 is positioned at a desired arrangement position in the X direction. That is, the 1 st convex portion 22b and the 2 nd convex portion 22c of the 1 st bearing portion 522 and the 1 st contact surface 523c and the 2 nd contact surface 523d of the 2 nd bearing portion 523 constitute positioning portions.

In addition, as in the second modification of the fourth embodiment shown in fig. 16 and 17, the 1 st convex portion 622a of the 1 st bearing portion 622 has the 1 st engaging portion 622b on the X1 direction side. The 2 nd convex portion 622c of the 1 st bearing portion 622 has a 2 nd engaging portion 622d on the X1 direction side. The 1 st recessed portion 623a of the 2 nd bearing portion 623 has a 1 st engaged portion 623b on the X1 direction side. The 1 st engaging portion 622b engages with the 1 st engaged portion 623 b. The 2 nd recess 623c of the 2 nd bearing portion 623 has a 2 nd engaged portion 623d on the X1 direction side. The 2 nd engaging portion 622d engages with the 2 nd engaged portion 623 d.

Specifically, when the 1 st convex portion 622a is inserted into the 1 st concave portion 623a, the 1 st engaging portion 622b engages with the 1 st engaged portion 623b of the 1 st concave portion 623a from the X2 direction side. When the 2 nd convex portion 622c is inserted into the 2 nd concave portion 623c, the 2 nd engaging portion 622d engages with the 2 nd engaged portion 623d of the 2 nd concave portion 623c from the X2 direction side. Thereby, the 2 nd bearing portion 623 is positioned at a desired arrangement position in the X direction. That is, the 1 st engaging portion 622b, the 1 st engaged portion 623b, the 2 nd engaging portion 622d, and the 2 nd engaged portion 623d constitute positioning portions.

[ fifth embodiment ]

Next, the structure of an intake manifold 702 according to a fifth embodiment of the present invention will be described with reference to fig. 18 to 20. Unlike the intake manifold 2 of the first embodiment in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are pressed into contact with each other over the entire X-direction upper surface, the fifth embodiment describes an example of the intake manifold 702 in which the 1 st bearing portion 722 and the 2 nd bearing portion 23 are intermittently in contact with each other in the X-direction. In the fifth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

An intake manifold 702 (an example of the "intake device of an internal combustion engine" according to the present invention) of the fifth embodiment includes an intake device main body 2a (see fig. 1), a tumble flow control valve 2b (an example of the "valve body" according to the present invention), and a bearing 702 c.

(Bearings)

As shown in fig. 18, the bearing 702c is configured to support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 702c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 722, and a plurality of (3) 2 nd bearing portions 23.

Since each of the 1 st bearing portions 722 has the same structure and each of the 2 nd bearing portions 23 has the same structure, only one set of the 1 st bearing portions 722 and the 2 nd bearing portions 23 will be described below.

(1 st bearing part and 2 nd bearing part)

As shown in fig. 19 and 20, the 1 st and 2 nd convex portions 722a and 722b of the 1 st bearing portion 722 are provided intermittently in the X direction, not throughout the X direction. That is, the 1 st protruding portion 722a and the 2 nd protruding portion 722b of the 1 st bearing portion 722 are divided into a plurality (2) in the X direction. Specifically, the 1 st and 2 nd convex portions 722a and 722b of the 1 st bearing portion 722 are divided into an X1 direction end portion and an X2 direction end portion. Here, the 1 st protruding portion 722a and the 2 nd protruding portion 722b of the 1 st bearing portion 722 may be divided into 3 or more, instead of 2. The other structure of the intake manifold 702 of the fifth embodiment is the same as that of the intake manifold 2 of the first embodiment, and therefore, the description thereof is omitted.

(Effect of the fifth embodiment)

The effect of the fifth embodiment will be described.

In the fifth embodiment, as described above, the 1 st bearing portion 722 and the 2 nd bearing portion 23 are provided in the intake manifold 702. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing portion formed by the 1 st bearing portion 722 and the 2 nd bearing portion 23, and thus can suppress rattling of the rotating shaft 2 f.

In the fifth embodiment, as described above, the 1 st protruding portion 722a and the 2 nd protruding portion 722b of the 1 st bearing portion 722 are provided so as to be divided into a plurality (2) in the X direction. Accordingly, when the 2 nd bearing part 23 is press-fitted into the 1 st bearing part 722, the sliding portions of the 1 st bearing part 722 and the 2 nd bearing part 23 can be dispersed, and therefore, the frictional resistance can be reduced. As a result, the 2 nd bearing part 23 can be easily press-fitted into the 1 st bearing part 722. Other effects of the fifth embodiment are the same as those of the first embodiment.

[ sixth embodiment ]

Next, the structure of an intake manifold 802 according to a sixth embodiment of the present invention will be described with reference to fig. 21 to 23. Unlike the intake manifold 2 of the first embodiment in which the rotating shaft 2f of the tumble control valve 2b is rotatably supported by the 1 st bearing part 22 and the 2 nd bearing part 23, the sixth embodiment describes an example in which the rotating shaft 821 of the tumble control valve 802b is rotatably supported by the intake manifold 802 of the 1 st bearing part 822 and the 2 nd bearing part 23 in a positioned state. In the sixth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 21 and 22, an intake manifold 802 (an example of the "intake device for an internal combustion engine" according to the present invention) according to the sixth embodiment includes an intake device main body 2a, a tumble flow control valve 802b (an example of the "valve body" according to the present invention), and a bearing 802 c.

As shown in fig. 22 and 23, the tumble flow control valve 802b of the sixth embodiment includes a rotating shaft 821 and a plurality of (4) valve portions 2 g. Rotating shaft 821 has rotating shaft side projection 821 a. Rotating shaft-side projection 821a projects from the outer surface of rotating shaft 821 in the radial direction of rotating shaft 821.

(Bearings)

Bearing 802c is configured to rotatably support rotating shaft 821. Specifically, the bearing 802c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 822, and a plurality of (3) 2 nd bearing portions 23.

Since each of the 1 st bearing portions 822 has the same structure and each of the 2 nd bearing portions 23 has the same structure, only one set of the 1 st bearing portions 822 and the 2 nd bearing portions 23 will be described below.

(1 st bearing part)

The 1 st bearing part 822 of the sixth embodiment has a receiving side concave part 822 a. Receiving recess 822a is formed at a position corresponding to rotating shaft side projection 821 a. Receiving-side concave portion 822a is recessed from the surface of rotation shaft 821 side of 1 st bearing portion 822 along the radial direction of rotation shaft 821. Here, in a state where the tumble flow control valve 802b is mounted on the bearing 802c, the rotating shaft-side protrusion 821a and the receiving-side recess 822a are engaged in the X direction (the axial direction of the rotating shaft 821). Thus, in a state where the 2 nd bearing 23 is press-fitted into the 1 st bearing 822, the rotation shaft side projection 821a is engaged with the receiving side recess 822a, whereby the tumble flow control valve 802b is positioned in the X direction. The other structure of the intake manifold 802 according to the sixth embodiment is the same as that of the intake manifold 2 according to the first embodiment, and therefore, the description thereof is omitted.

(Effect of the sixth embodiment)

The effect of the sixth embodiment will be described.

In the sixth embodiment, as described above, the 1 st bearing portion 822 and the 2 nd bearing portion 23 are provided in the intake manifold 802. This can suppress an increase in the gap (clearance) between the rotating shaft 821 and the bearing portion formed by the 1 st bearing portion 822 and the 2 nd bearing portion 23, and thus can suppress rattling of the rotating shaft 821.

In the sixth embodiment, as described above, in the state where the 2 nd bearing portion 23 is press-fitted into the 1 st bearing portion 822, the rotation shaft side protrusion 821a is engaged with the receiving side concave portion 822a, and the tumble flow control valve 802b is positioned in the X direction. This can suppress the fluctuation in the X direction, and therefore, can suppress the abnormal noise generated by the fluctuation of the rotating shaft 821. Other effects of the sixth embodiment are the same as those of the first embodiment.

[ seventh embodiment ]

Next, the structure of an intake manifold 902 according to a seventh embodiment of the present invention will be described with reference to fig. 24 to 26. Unlike the intake manifold 2 of the first embodiment in which the rotation shaft 2f of the tumble control valve 2b is rotatably supported by the 1 st bearing portion 22 and the 2 nd bearing portion 23, in the seventh embodiment, an example of the intake manifold 902 in which the rotation shaft 921 of the tumble control valve 902b is rotatably supported by the 1 st bearing portion 922 and the 2 nd bearing portion 23 in a state in which the rotation shaft is positioned and the range of rotation is restricted is described. In the seventh embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 24 and 25, an intake manifold 902 (an example of the "intake device for an internal combustion engine" according to the present invention) of the seventh embodiment includes an intake device main body 2a, a tumble flow control valve 902b (an example of the "valve body" according to the present invention), and a bearing 902 c.

As shown in fig. 25 and 26, the tumble flow control valve 902b of the seventh embodiment includes a rotation shaft 921 and a plurality of (4) valve portions 2 g. The rotation shaft 921 has a rotation shaft side projection 921 a. The rotation shaft side protrusion 921a protrudes from the outer surface of the rotation shaft 921 in the radial direction of the rotation shaft 921. The rotation shaft-side projection 921a is provided on a part of the rotation shaft 921 in the R direction.

(Bearings)

The bearing 902c is configured to support the rotating shaft 921 so as to rotate the rotating shaft 921. Specifically, the bearing 902c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 922, and a plurality of (3) 2 nd bearing portions 23.

Since each of the plurality of 1 st bearing portions 922 has the same structure and each of the plurality of 2 nd bearing portions 23 has the same structure, only one set of the 1 st bearing portion 922 and the 2 nd bearing portion 23 will be described below.

(1 st bearing part and 2 nd bearing part)

The 1 st bearing portion 922 of the seventh embodiment has a receiving side recessed portion 922 a. The receiving-side concave portion 922a is formed at a position corresponding to the rotation shaft-side convex portion 921 a. The receiving-side concave portion 922a is recessed from the surface of the 1 st bearing portion 922 on the rotation shaft 921 side in the radial direction of the rotation shaft 921.

Here, in a state where the tumble flow control valve 902b is attached to the bearing 902c, the rotation shaft-side protrusion 921a and the 2 nd bearing portion 23 abut in the R1 direction in the R direction (circumferential direction) of the rotation shaft 921. In a state where the tumble flow control valve 902b is attached to the bearing 902c, the rotation shaft-side protrusion 921a and the receiving-side recess 922a abut in the R2 direction out of the R direction of the rotation shaft 921. Thereby, the rotation of the tumble flow control valve 902b is limited to a specified range. Note that the specified range is preferably about 90 degrees.

In this way, in the state where the 2 nd bearing 23 is press-fitted into the 1 st bearing 922, the rotation shaft side projection 921a is engaged with the receiving side recess 922a, whereby the rotation of the tumble control valve 902b in the R direction is restricted. In a state where the 2 nd bearing 23 is press-fitted into the 1 st bearing 922, the rolling flow control valve 902b is positioned in the X direction by engaging the rotation shaft side protrusion 921a with the receiving side recessed portion 922 a. The other structure of the intake manifold 902 of the seventh embodiment is the same as that of the intake manifold 2 of the first embodiment, and therefore, the description thereof is omitted.

(Effect of the seventh embodiment)

The effect of the seventh embodiment will be described.

In the seventh embodiment, as described above, the 1 st bearing portion 922 and the 2 nd bearing portion 23 are provided in the intake manifold 902. This can suppress an increase in the gap (clearance) between the rotating shaft 921 and the bearing formed by the 1 st bearing portion 922 and the 2 nd bearing portion 23, and thus can suppress rattling of the rotating shaft 921.

In the seventh embodiment, as described above, in the state where the 2 nd bearing portion 23 is press-fitted into the 1 st bearing portion 922, the rotation shaft side protrusion 921a is engaged with the receiving side recessed portion 922a, whereby the rotation of the tumble flow control valve 902b in the R direction is restricted. This can prevent the tumble control valve 902b from completely closing the intake passage 2e, and thus the intake into the combustion chamber 9 can be reliably performed. Other effects of the seventh embodiment are the same as those of the first embodiment.

[ eighth embodiment ]

Next, the structure of an intake manifold 1002 according to an eighth embodiment of the present invention will be described with reference to fig. 27 to 30. Unlike the intake manifold 2 of the first embodiment in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are housed in the partition portion 24, in the eighth embodiment, an example of the intake manifold 1002 in which the 1 st bearing portion 22 and the 2 nd bearing portion 1023 suppress the mutual flow of air in the adjacent intake passages 2e in the partition portion 24 will be described. In the eighth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 27 and 28, an intake manifold 1002 (an example of an "intake device for an internal combustion engine" according to an embodiment of the present invention) according to an eighth embodiment includes an intake device main body 1002a, a tumble flow control valve 2b (an example of a "valve body" according to an embodiment of the present invention), a bearing 1002c, and a bypass path portion 1002 d. The intake device main body 1002a includes an accommodation recess 1021 arranged between the plurality of intake passages 2 e. The receiving recess 1021 is configured to receive the 2 nd bearing 1023. In the housing recess 1021, the partition portion 24 is recessed on the side facing in the intake air flow direction, on the side opposite to the intake air flow direction.

As shown in fig. 28 and 29, the housing recess 1021 has an insertion recess 1022. In the insertion recess 1022, an inner surface of the housing recess 1021 facing the 2 nd bearing portion 1023 is recessed in the radial direction of the rotation shaft 2 f. The insertion recess 1022 is formed at a position corresponding to a protrusion 1023a described later. A part of the protrusion 1023a is inserted into the insertion recess 1022.

(Bearings)

The bearing 1002c is configured to support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 1002c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 22, and a plurality of (3) 2 nd bearing portions 1023.

(2 nd bearing part)

The 2 nd bearing portion 1023 has a projection 1023a provided on an outer surface facing the accommodation recess 1021. The protrusion 1023a protrudes from the outer surface facing the housing recess 1021 in the radial direction of the rotation shaft 2 f. The protrusion 1023a is a part of the 2 nd bearing 1023.

(circuitous path)

The detour path portion 1002d is a path formed by providing a curved portion in a path formed between adjacent intake passages 2 e. Specifically, the bypass diameter portion 1002d is provided between the plurality of intake passages 2e by inserting a part of the protrusion portion 1023a into the insertion recess 1022. Here, in a state where a part of the protrusion 1023a is inserted into the insertion recess 1022, a part of the protrusion 1023a does not abut against the inner surface of the insertion recess 1022. The other structure of the intake manifold 1002 according to the eighth embodiment is the same as that of the intake manifold 2 according to the first embodiment, and therefore, the description thereof is omitted.

(Effect of the eighth embodiment)

The effect of the eighth embodiment will be described.

In the eighth embodiment, as described above, the 1 st bearing portion 22 and the 2 nd bearing portion 1023 are provided in the intake manifold 1002. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing formed by the 1 st bearing portion 22 and the 2 nd bearing portion 1023, and thus can suppress rattling of the rotating shaft 2 f.

In the eighth embodiment, as described above, the projection 1023a is partially inserted into the insertion recess 1022, so that the bypass diameter portion 1002d is provided between the plurality of intake passages 2 e. This makes it possible to prevent air from leaking between adjacent intake passages 2e of the plurality of intake passages 2e, and thus to avoid disturbance of intake air in the intake passages 2 e. Other effects of the eighth embodiment are the same as those of the first embodiment.

(modification example)

The detour path portion 1002d may be formed of an accommodation recess 2021 and a protrusion 1023a in which no insertion recess is provided, as in the detour path portion 2002d of the eighth embodiment shown in fig. 30.

[ ninth embodiment ]

Next, the structure of the intake manifold 3002 according to a ninth embodiment of the present invention will be described with reference to fig. 31 to 33. Unlike the intake manifold 2 of the first embodiment in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are housed in the partition portion 24, in the ninth embodiment, an example of the intake manifold 3002 in which the 1 st bearing portion 22 and the 2 nd bearing portion 3023 are sealed by a sealing member in the partition portion 24 will be described. In the ninth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in fig. 31 and 32, an intake manifold 3002 (an example of the "intake device for an internal combustion engine" according to the present invention) of the ninth embodiment includes an intake device main body 3002a, a tumble control valve 2b (an example of the "valve body" according to the present invention), and a bearing 3002 c. The intake device main body 3002a includes a housing recess 3021 disposed between the plurality of intake passages 2 e. The housing recess 3021 is configured to house the 2 nd bearing portion 3023. In the housing recess 3021, the partition portion 24 is recessed on the side facing in the intake air flow direction, on the side opposite to the intake air flow direction.

As shown in fig. 32 and 33, the housing recess 3021 has a sealing abutment surface 3021 a. The sealing abutment surface 3021a is an inner surface facing the accommodation recess 3021 of the 2 nd bearing portion 3023. The sealing abutment surface 3021a is formed at a position corresponding to a sealing convex portion 3023a described later. The sealing convex portion 3023a abuts against the sealing abutment surface 3021 a.

(Bearings)

The bearing 3002c is configured to support the rotating shaft 2f so that the rotating shaft 2f can rotate. Specifically, the bearing 3002c includes a plurality of (4) insertion tube portions 21, a plurality of (3) 1 st bearing portions 22, and a plurality of (3) 2 nd bearing portions 3023.

(2 nd bearing part)

The 2 nd bearing portion 3023 has a sealing convex portion 3023a provided on an outer surface facing the housing concave portion 3021. The sealing convex portion 3023a is a sealing member having elasticity. The sealing convex portion 3023a protrudes from the outer surface of the 2 nd bearing portion 3023 facing the receiving concave portion 3021 in the radial direction of the rotating shaft 2 f. The sealing convex portion 3023a is compressed by coming into contact with the sealing contact surface 3021 a. The other structure of the intake manifold 3002 according to the ninth embodiment is the same as that of the intake manifold 2 according to the first embodiment, and therefore, the description thereof is omitted.

(Effect of the ninth embodiment)

The effect of the ninth embodiment will be described.

In the ninth embodiment, as described above, the 1 st bearing portion 22 and the 2 nd bearing portion 3023 are provided in the intake manifold 3002. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing formed by the 1 st bearing portion 22 and the 2 nd bearing portion 3023, and thus can suppress rattling of the rotating shaft 2 f.

In the ninth embodiment, as described above, the receiving recess 3021 is provided with the sealing contact surface 3021a against which the sealing convex portion 3023a contacts. This can prevent air from leaking between adjacent intake passages 2e of the plurality of intake passages 2e, and thus can prevent intake air in the intake passages 2e from being disturbed. Other effects of the ninth embodiment are the same as those of the first embodiment.

[ tenth embodiment ]

Next, the structure of the intake manifold 4002 according to the tenth embodiment of the present invention will be described with reference to fig. 34 and 35. Unlike the intake manifold 2 of the first embodiment in which the 1 st bearing portion 22 and the 2 nd bearing portion 23 are formed by resin molding, in the tenth embodiment, an example of the intake manifold 4002 in which the 1 st bearing portion 4022 and the 2 nd bearing portion 4023 are integrally formed by resin molding will be described. In the tenth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

A molded body of an intake manifold 4002 (an example of the "intake apparatus for an internal combustion engine" according to the present invention) of the tenth embodiment is formed by resin molding. The molded body of the intake manifold 4002 includes a molded body of the intake device main body 2a and a molded body of the bearing 4002 c.

(Bearings)

As shown in fig. 34 and 35, the molded body of the bearing 4002c is formed by resin molding. The molded body of the bearing 4002c includes a plurality of (4) molded bodies inserted into the tube portion 4021, a plurality of (3) molded bodies of the 1 st bearing portion 4022, and a plurality of (3) molded bodies of the 2 nd bearing portion 4023. The other structure of intake manifold 4002 of the tenth embodiment is the same as that of intake manifold 2 of the first embodiment, and therefore, description thereof is omitted.

(method of manufacturing intake manifold)

Next, a method for manufacturing intake manifold 4002 will be described with reference to fig. 36. The intake manifold 4002 is formed by this manufacturing method.

In step S1, the air intake device main body 2a is formed by resin molding. That is, the intake device main body 2a including the plurality of intake passages 2e is formed, and the plurality of intake passages 2e communicate with the combustion chamber 9 of the engine main body and supply intake air to the combustion chamber 9. In step S2, the first bearing portion 1 and the second bearing portion 2 are integrally formed by filling a single metal mold with resin. That is, a 1 st bearing portion 4022 and a 2 nd bearing portion 4023 are integrally formed, the 1 st bearing portion 4022 supports a rotary shaft 2f provided in a valve body of the intake device main body 2a so that the rotary shaft 2f is rotatable, and the 2 nd bearing portion 4023 supports the rotary shaft 2f together with the 1 st bearing portion 4022. In step S3, the 2 nd bearing portion 4023 is press-fitted into the 1 st bearing portion. That is, the 2 nd bearing portion 4023 is press-fitted into the 1 st bearing portion 4022 from one side in the axial direction in which the rotation shaft 2f line of the rotation shaft 2f extends. After step S3, the method of manufacturing intake manifold 4002 ends.

(Effect of the tenth embodiment)

The effect of the tenth embodiment will be described.

In the tenth embodiment, as described above, the 1 st bearing portion 4022 and the 2 nd bearing portion 4023 are provided in the intake manifold 4002. This can suppress an increase in the gap (clearance) between the rotating shaft 2f and the bearing portion formed by the 1 st bearing portion 4022 and the 2 nd bearing portion 4023, and thus can provide a method for manufacturing the intake manifold 4002 that can suppress rattling of the rotating shaft 2 f.

In addition, in the tenth embodiment, as described above, the 1 st bearing portion 4022 and the 2 nd bearing portion 4023 are formed integrally, and therefore, the 1 st bearing portion 4022 and the 2 nd bearing portion 4023 can be formed under the same environment, and therefore, variation in the dimensions of the 1 st bearing portion 4022 and the 2 nd bearing portion 4023 can be suppressed.

In addition, in the tenth embodiment, as described above, the number of manufacturing steps can be reduced by integrally forming the 1 st bearing portion 4022 and the 2 nd bearing portion 4023, as compared with the case where the 1 st bearing portion 4022 and the 2 nd bearing portion 4023 are formed separately. Other effects of the tenth embodiment are the same as those of the first embodiment.

[ modified examples ]

The presently disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the claims, rather than the description of the above embodiments, and further includes all modifications (variations) within the meaning and scope equivalent to the claims.

For example, in the first to tenth embodiments, the rotating shaft 2f (821, 921) is formed of a resin material, but the present invention is not limited thereto. In the present invention, the rotation shaft may be formed of metal.

In the first to tenth embodiments, the tumble flow control valve 2b (802b, 902b) is described as an example of the "valve body" according to the present invention, but the present invention is not limited to this. The present invention is directed to a variable intake valve for changing the path length of an intake passage when the engine is at a high rotation speed and at each rotation speed at a low rotation speed, and to an example of the "valve element" according to the present invention.

In the first to tenth embodiments, the 2 nd bearing portion 23(223, 623, 1023, 3023, 4023) is press-fitted into the 1 st bearing portion 22 from the X2 direction side (the side in the axial direction in which the rotation axis 2f line of the rotation axis 2f extends). In the present invention, the 2 nd bearing portion may be pressed into the 1 st bearing portion from the other side in the axial direction in which the rotation axis of the rotation shaft extends.

In addition, in the eighth embodiment, the example in which the part of the protrusion 1023a is not in contact with the inner surface of the insertion recess 1022 in the state in which the part of the protrusion is inserted into the insertion recess 1022 is shown, but the present invention is not limited thereto. In the present invention, a part of the protrusion may abut against an inner surface of the insertion recess in a state where the part of the protrusion is inserted into the insertion recess.

In addition, although the eighth embodiment illustrates an example in which the protrusion 1023a is a part of the 2 nd bearing 1023, the present invention is not limited thereto. In the present invention, the protrusion may be an elastic member separately attached to the 2 nd bearing portion.

Description of the symbols

1 Engine main body (internal combustion engine main body)

2 air intake manifold (air inlet device of internal combustion engine)

2a, 302a, 402a, 1002a, 3002a intake device main body

2b, 802b, 902b tumble control valve (spool)

2e air intake passage

2f, 821, 921 axis of rotation

9 combustion chamber

22. 222, 622, 722, 822, 922, 4022 the 1 st bearing part

22a convex part

23. 223, 623, 1023, 3023, 4023 the 2 nd bearing part

23a recess

31 st positioning surface

31a 1 st lateral surface (a pair of lateral surfaces)

31b 2 nd outer side (a pair of outer sides)

32 nd 2 positioning surface

32a inner side 1 (a pair of inner sides)

32b inner side 2 (a pair of inner sides)

100 engines (internal combustion engine)

122a 1 st projection (projection)

122b 2 nd projection (projection)

123a 1 st insertion recess (insertion recess)

123b 2 nd insertion recess (insertion recess)

325. 425, 1021, 2021, 3021 accommodating recess

420 a positioning section.

Claims (6)

1. An intake device for an internal combustion engine, comprising:

an intake device main body including a plurality of intake passages that communicate with a combustion chamber of an internal combustion engine main body and supply intake air to the combustion chamber;

the valve core comprises a rotating shaft and is arranged in the plurality of air inlet channels;

a 1 st bearing portion provided in the intake device main body and supporting the rotary shaft so that the rotary shaft is rotatable; and

and a 2 nd bearing portion that supports the rotating shaft together with the 1 st bearing portion in a state in which the 2 nd bearing portion is press-fitted into the 1 st bearing portion from one side in an axial direction in which a rotation axis of the rotating shaft extends.

2. The intake apparatus of an internal combustion engine according to claim 1,

the 1 st bearing portion includes a 1 st positioning surface,

the 2 nd bearing portion includes a 2 nd positioning surface,

the 1 st bearing and the 2 nd bearing are positioned in the 1 st direction by abutting the 1 st positioning surface and the 2 nd positioning surface.

3. The intake apparatus of an internal combustion engine according to claim 2,

the 1 st bearing portion includes a convex portion provided with the 1 st positioning surface and protruding toward the 2 nd bearing portion,

the 2 nd bearing portion includes a concave portion having the 2 nd positioning surface and provided corresponding to the convex portion,

the 1 st bearing part and the 2 nd bearing part are positioned in the 1 st direction by press-fitting the concave part into the convex part.

4. The intake apparatus of an internal combustion engine according to claim 3,

the 1 st direction is a direction orthogonal to the axis direction and a 2 nd direction along a protruding direction of the convex portion,

the 1 st positioning surface of the convex portion has a pair of outer side surfaces in the 1 st direction, and the 2 nd positioning surface of the concave portion has a pair of inner side surfaces in the 1 st direction,

at least one of the pair of outer side surfaces has a protruding portion protruding toward the inner side surface opposite to the pair of inner side surfaces,

an insertion recess portion formed corresponding to the protruding portion and inserted by the protruding portion is provided on an opposite inner side surface of the pair of inner side surfaces,

the 1 st bearing portion and the 2 nd bearing portion are positioned in the 1 st direction by abutment of the pair of outer side surfaces and the pair of inner side surfaces, and are positioned in the 2 nd direction by engagement of the protruding portion and the insertion recess.

5. The intake apparatus of an internal combustion engine according to any one of claims 1 to 4,

the intake device main body further includes a housing recess portion disposed between the plurality of intake passages,

the 2 nd bearing part is accommodated while being sandwiched between a pair of inner side surfaces of the accommodating recess.

6. The intake apparatus of an internal combustion engine according to claim 1,

the intake device of the internal combustion engine further includes a positioning portion that positions the 2 nd bearing portion with respect to the 1 st bearing portion in the axial direction in a state where the 2 nd bearing portion is press-fitted into the 1 st bearing portion.

Images