JP2022135153A - Intake air control device - Google Patents

Abstract

To reduce weight while reducing assembly man-hours in an intake air control device.SOLUTION: An intake air control device 10 comprises a throttle body 16 comprising an intake air passage 22 thereinside, and an air duct 14 connected to a drum part 32 of the throttle body 16. A fitting concave part 34 recessed inward in a radial direction is formed in the drum part 32. A connection flange 48 into which the drum part 32 is inserted is formed at a downstream end of the air duct 14. When the throttle body 16 and the air duct 14 are connected, the fitting concave part 34 and a fitting convex part 62 are fitted, and thereby a communication groove 66 formed in the connection flange 48 and communicating with an intake passage 46 is arranged so as to face a bypass passage 44 opened in the drum part 32.SELECTED DRAWING: Figure 2

Description

The present invention relates to an intake control device for controlling the amount of intake air supplied to an internal combustion engine.

The present applicant has proposed a straddle-type vehicle equipped with an intake control device capable of controlling the flow rate (intake amount) of air supplied to an internal combustion engine mounted in the vehicle (see Patent Document 1). . This intake control device has a throttle valve for opening and closing a passage through which air flows, and a connecting tube is connected to the upstream side of the passage. The outside air taken in through the air cleaner flows through the connecting tube to the passage, and is supplied to the cylinder chamber of the internal combustion engine on the downstream side at a flow rate corresponding to the opening/closing state of the throttle valve.

JP 2015-183538 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air intake control device that can reduce the number of assembly steps and reduce the weight.

In order to achieve the above object, an aspect of the present invention provides a throttle body that is connected to a combustion chamber of an internal combustion engine and constitutes at least a part of an intake passage through which intake air flowing into the combustion chamber passes; Equipped with a throttle valve that changes the area to adjust the amount of intake air, and a tube that is connected to the upstream side of the intake passage and through which the intake air taken in from the outside flows,
The throttle body has a throttle-body-side end where the upstream end of the intake passage is open, and the intake passage and the tube are connected by fitting a fitting portion of the tube to the outer peripheral surface of the throttle-body-side end. ,
The tube has a tube-side end formed inside the fitting portion and facing the throttle body-side end when the throttle body and the tube are connected and communicating with the intake passage,
The intake passage includes a first main passage portion formed in the center of the throttle body side end portion where the throttle valve is arranged, and a first main passage portion formed outside the first main passage portion on the upstream and downstream sides of the throttle valve. a bypass passage portion that bypasses the throttle valve by communicating with the passage portion;
An intake control device comprising: a second main passage portion having a tube-side end formed in the center thereof;
The inner peripheral portion of the fitting portion is provided with a fitting convex portion projecting toward the second main passage portion, and the outer peripheral portion of the throttle body side end portion is recessed toward the first main passage portion. Equipped with a joint recess,
When connecting the throttle body and the tube, the fitting protrusion and the fitting recess are fitted to communicate the bypass passage and the auxiliary passage.

According to the present invention, the throttle body constituting the intake air control device has the throttle body side end portion where the upstream end of the intake passage is open, and the outer peripheral surface of the throttle body side end portion receives the air taken in from the outside. The fitting portions of the circulating tubes are connected to each other by being fitted, and the fitting protrusion formed on the inner peripheral portion of the fitting portion and the fitting projection formed on the outer peripheral portion of the end on the throttle body side are connected to each other. A mating recess is formed so as to be fittable.

Therefore, when connecting the throttle body side end portion and the tube side end portion, the throttle body side end portion and the tube side end portion are positioned in the circumferential direction by fitting the fitting convex portion and the fitting concave portion. the first main passage formed in the center of the throttle body side end where the throttle valve is disposed and the second main passage formed in the center of the tube side end are connected and communicated, A bypass passage portion formed outside the first main passage portion and a sub passage portion formed by widening a portion of the peripheral surface of the second main passage portion radially outward are arranged so as to face each other and communicate with each other. be able to.

As a result, when connecting the tube to the throttle body by fitting the fitting concave portion and the fitting convex portion, the bypass passage portion and the auxiliary passage portion can be easily positioned in a mutually positioned state without adjusting the positions of the bypass passage portion and the auxiliary passage portion. Since the connection can be reliably made, the man-hours for assembling the intake control device can be reduced. Further, by providing the fitting recess in the throttle body, the volume of the throttle body is reduced compared to the case where the fitting recess is not provided, so that weight reduction can be achieved.

According to the present invention, the following effects are obtained.

That is, a fitting concave portion is provided on the outer peripheral portion of the throttle body side end portion of the throttle body, and a fitting convex portion protruding toward the second main passage portion side is provided on the inner peripheral portion of the fitting portion. When connecting the tube-side end portion, the throttle-body-side end portion and the tube-side end portion are positioned in the circumferential direction by fitting the fitting convex portion and the fitting recessed portion, thereby forming the first main passage portion. A bypass passage portion formed on the outside and a sub-passage portion formed by widening a portion of the peripheral surface of the second main passage portion radially outward can be arranged so as to face each other and communicate with each other.

As a result, when the tube is connected to the throttle body, the bypass passage portion and the auxiliary passage portion are positioned relative to each other without adjusting the positions of the bypass passage portion and the auxiliary passage portion under the fitting action of the fitting concave portion and the fitting convex portion. Since the connection can be easily and reliably made, the man-hours for assembling the intake control device can be reduced. Further, by providing the fitting recess in the throttle body, it is possible to reduce the weight of the intake control device.

1 is an external perspective view showing a throttle body of an intake control device according to an embodiment of the present invention; FIG. FIG. 2 is an exploded perspective view showing a state in which an air duct is removed from a throttle body in the intake control device shown in FIG. 1; FIG. 2 is a front view showing a state in which an air duct is connected to the intake control device of FIG. 1; 4 is a cross-sectional view taken along line IV-IV of FIG. 3; FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an intake control device according to the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, this intake control device 10 is provided between an inlet pipe 12 of an internal combustion engine and an air duct (tube) 14 into which outside air is introduced. and a valve (throttle valve) 20 connected to the shaft 18 and rotatably provided inside the throttle body 16 . The intake control device 10 is mounted on a vehicle (not shown) so that the shaft 18 is substantially horizontal (see FIG. 3).

The throttle body 16 is made of, for example, a metal material, and an intake passage (first main passage portion) 22 having a circular cross section penetrates through the center thereof. A flange 24 is formed and connected to the upstream end of inlet pipe 12 (see FIG. 4).

The intake passage 22 extends in a straight line along the horizontal direction (directions of arrows A and B). A valve 20 is connected via a screw 26 to freely open and close the intake passage 22 . The valve 20 is inclined by a predetermined angle so that the upper end thereof faces the downstream side (direction of arrow B) and the lower end thereof faces the upstream side (direction of arrow A). The intake passage 22 is opened by rotating in the direction of the arrow B so that the lower end side faces the upstream side (the direction of the arrow A).

The shaft 18 extends substantially horizontally (in the direction of arrow C) as shown in FIG. 1, and both ends of the shaft 18 are inserted into shaft holes 28 (see FIG. 4) of the throttle body 16 and rotatably supported. At the same time, one end thereof protrudes outside the throttle body 16 and a rotation detection sensor (not shown) is mounted thereon. On the other hand, the other end of the shaft 18 protrudes outward from the opposite side of the throttle body 16 and is connected to the throttle drum 30 .

An accelerator wire (not shown) connected to the throttle drum 30 is pulled by the accelerator operation of the driver in the vehicle, so that the throttle drum 30 rotates by a predetermined amount against the elastic force of a spring (not shown). Accordingly, the shaft 18 and the valve 20 are rotated by a predetermined angle.

The throttle body 16 also has a cylindrical body portion 32 extending toward the other end on the upstream side (in the direction of arrow A) of the intake passage 22 . The intake passage 22 penetrates and opens at the end, and a fitting recess 34 is formed at the end of the cylindrical portion 32 (the end on the side of the throttle body) that is recessed radially inward from the outer peripheral surface.

The fitting recess 34 is partially formed in the circumferential direction (direction of arrow D) of the cylindrical portion 32, and is recessed to a predetermined depth radially inward of the outer peripheral surface, that is, toward the intake passage 22 side. 3 is formed in an arcuate cross-section having a predetermined length in the radial direction when viewed from the axial direction of the intake passage 22 shown in FIG. Specifically, as shown in FIG. 3, the fitting recess 34 extends vertically (in the direction of arrow E) through the center of the intake passage 22 when the intake control device 10 is mounted on the vehicle. It is formed in a range of a predetermined angle toward the throttle drum 30 side along the circumferential direction (arrow D direction) with respect to the imaginary line L, and is formed in an arcuate cross section with a long radial outer side and a short radial inner side. ing.

The fitting recess 34 extends from the tip of the cylindrical portion 32 to which the air duct 14 is connected in the axial direction (the direction of arrow B) with the same cross-sectional shape and a predetermined length, and along the extending direction. A stepped portion 36 projecting radially outward with respect to the peripheral surface of the fitting recess 34 is formed on the base end side (in the direction of arrow B). As with the fitting recess 34, the stepped portion 36 is formed in an arcuate cross section that protrudes radially outward when viewed from the axial direction of the intake passage 22 shown in FIG.

3 and 4, a connection flange (fitting portion) 48 provided at the downstream end of the air duct 14, which will be described later, is connected to the outer peripheral surface of the cylindrical portion 32, thereby The air supplied through the air duct 14 is supplied to the intake passage 22 of the throttle body 16 and circulates.

Furthermore, as shown in FIGS. 1 to 3, a boss portion 38 protruding upward is formed on the upper portion of the cylindrical portion 32, and an insertion hole (not shown) opening at the upper end of the boss portion 38 is formed. ) is screwed with an idle control valve 40 so as to move forward and backward along the vertical direction (direction of arrow E). The tip of the idle adjustment valve 40 is inserted into a bypass passage (bypass passage portion) 44 to be described later, and is provided so as to be able to adjust the opening area in the bypass passage 44 by moving it forward and backward with respect to the boss portion 38 .

Furthermore, in the throttle body 16, a mounting flange 42 is formed at a position outside the cylindrical portion 32 for fixing the throttle body 16 to an internal combustion engine (not shown).

A bypass passage 44 is formed in the throttle body 16 to bypass the upstream side and the downstream side of the valve 20 provided in the intake passage 22 . The bypass passage 44 is formed substantially parallel to the radially outer side of the intake passage 22, and its upstream end 44a extends radially outwardly of the intake passage 22 from the distal end surface of the cylindrical portion 32. The openings are spaced apart by a distance. On the other hand, the downstream end of the bypass passage 44 is connected to the intake passage 22 downstream of the valve 20 .

When the valve 20 is fully closed as shown in FIG. 4, intake air from the air duct 14 flows downstream of the valve 20 through the bypass passage 44 so as to bypass the valve 20 and is supplied to the internal combustion engine. The bypass passage 44 communicates with the insertion hole of the boss portion 38 near the center in the extending direction thereof, and the idling intake air flowing through the bypass passage 44 is controlled by the idle adjustment valve 40 screwed to the boss portion 38 . quantity is adjusted.

As shown in FIGS. 2 to 4, the air duct 14 is formed of, for example, a resin material in a tubular shape having a circular cross section, and an intake passage (second main passage portion) 46 through which air flows is formed therein. Its upstream end is connected to an air cleaner (not shown), and its downstream end is connected to the cylindrical portion 32 of the throttle body 16 via a connection flange 48 .

The connection flange 48 is formed with a substantially circular cross-section that expands radially outward and has a predetermined width in the axial direction (directions of arrows A and B). An annular groove 52 is formed to The annular groove 52 is recessed radially inward with respect to the outer peripheral surface of the connection flange 48 and is formed with a predetermined width in the axial direction (directions of arrows A and B).

The fastening band 50 includes, for example, a band portion 54 made of an elastic thin metal plate, a pair of fasteners 56a and 56b provided at both longitudinal ends of the band portion 54, and one fastener 56a. and a fastening bolt 58 for fastening the other fastener 56b.

An insertion recess 60 is formed inside the connection flange 48 so as to be recessed toward the upstream end of the air duct 14 and into which the tip of the cylindrical portion 32 is inserted. The insertion recess 60 is formed in a shape corresponding to the shape of the tip of the cylindrical portion 32 when viewed from the axial direction, and is fitted in the fitting recess 34 . It has a fitting protrusion 62 .

As shown in FIG. 3, when the air duct 14 is connected by inserting the tip of the cylindrical portion 32 into the insertion recess 60 of the connection flange 48, the fitting convex portion 62 fits into the fitting recess 34. By being inserted, positioning is performed in the circumferential direction (direction of arrow D) with respect to the cylindrical portion 32, and the axial end portion of the fitting convex portion 62 comes into contact with the stepped portion 36, thereby Positioning in the direction (direction of arrow B) is also performed at the same time.

Furthermore, as shown in FIGS. 2 and 4, the insertion recess 60 has an end wall (tube-side end) 64 perpendicular to the extending direction of the suction passage 46 at the boundary with the suction passage 46. A communicating groove (secondary passage portion) 66 extending toward the suction passage 46 is formed in the end wall portion 64 . The communication groove 66 is formed in an inclined shape inclined at a predetermined angle with respect to the extending direction of the suction passage 46 (directions of arrows A and B), and extends from the upstream side of the suction passage 46 toward the downstream end side (direction of arrow B). It is formed so as to incline radially outward from the inner peripheral surface of the suction passage 46 . In other words, the communication groove 66 is formed by cutting out a part of the end wall portion 64 so that the insertion recess 60 and the suction passage 46 can communicate with each other.

3 and 4, when the connection flange 48 of the air duct 14 is connected to the cylindrical portion 32 of the throttle body 16, the fitting action between the fitting convex portion 62 and the fitting concave portion 34 By being positioned below each other in the circumferential direction (arrow D direction) and axial direction (arrows A and B directions), the communication groove 66 is located at a position facing the upstream end 44a of the bypass passage 44, and the communication groove 66 is positioned. The bypass passage 44 and the suction passage 46 are communicated with each other through the passage. That is, the communication groove 66 functions as communication means that allows the suction passage 46 and the bypass passage 44 to communicate with each other.

The intake control device 10 according to the embodiment of the present invention is basically configured as described above. Next, a case where the air duct 14 is connected to the throttle body 16 will be described.

First, as shown in FIG. 2, the cylindrical portion 32 of the throttle body 16 constituting the intake control device 10 and the connecting flange 48, which is the downstream end of the air duct 14, are arranged to face each other. The cylindrical portion 32 is inserted into the insertion recess 60 of the connection flange 48 with the fitting recess 34 aligned with the fitting protrusion 62 of the connection flange 48 in the connection direction. That is, the cylindrical portion 32 is inserted into the insertion recess of the connection flange 48 while the position of the fitting recess 34 along the circumferential direction (the direction of arrow D) and the position of the fitting protrusion 62 along the circumferential direction are aligned. Insert into 60.

3 and 4, by inserting the fitting projection 62 into the fitting recess 34, the connection flange 48 relative to the cylindrical portion 32 in the circumferential direction (arrow D direction) The communication groove 66 is positioned so as to face the upstream end 44a of the bypass passage 44 opened at the front end surface of the cylindrical portion 32. As shown in FIG. In addition, since the end portion of the fitting projection 62 abuts against the stepped portion 36 in the fitting recess 34, the connection flange 48 including the fitting projection 62 moves toward the throttle body 16 (in the direction of the arrow B). Further movement is restricted, and the air duct 14 is positioned with respect to the throttle body 16 in the axial direction (directions of arrows A and B).

As a result, as shown in FIG. 4, the end surface of the cylindrical portion 32 contacts the end wall portion 64 of the connection flange 48, and the intake passage 46 and the intake passage 22 are arranged substantially coaxially and communicate with each other. At the same time, the suction passage 46 and the bypass passage 44 communicate with each other through the communication groove 66 .

As described above, the downstream end (connection flange 48 ) of the air duct 14 is moved in the circumferential direction (direction of arrow D) with respect to the cylindrical portion 32 of the throttle body 16 under the fitting action of the fitting convex portion 62 and the fitting concave portion 34 . And in a state of being positioned in the axial direction (directions of arrows A and B), the band portion 54 is reduced in diameter by screwing the fastening bolt 58 of the fastening band 50 and bringing the pair of fasteners 56a and 56b closer to each other. As a result, the connection flange 48 is tightened inward in the radial direction so that it comes into close contact with the outer peripheral surface of the cylindrical portion 32 .

As a result, the cylindrical portion 32 and the connection flange 48 are positioned and firmly connected by the fastening band 50, and the throttle body 16 and the air duct 14 are connected.

Next, the operation of the intake control device 10 to which the air duct 14 is connected as described above will be described.

First, in an idling state in which the internal combustion engine is started and the accelerator operation unit (not shown) of the vehicle is not operated, the intake passage 22 is fully closed by the valve 20 in the intake passage 22, and the air is taken in by an air cleaner (not shown). The intake air supplied through the intake passage 46 of the air duct 14 flows through the communication groove 66 to the bypass passage 44, flows downstream of the valve 20, and flows through the inlet pipe 12 to the cylinder chamber (combustion chamber) of the internal combustion engine. and supplied. At this time, the intake air flowing through the bypass passage 44 is adjusted to a desired intake air amount under the adjustment action of the idle adjustment valve 40 and then supplied downstream. This idling intake air is smoothly guided from the intake passage 46 to the bypass passage 44 by the communication groove 66 extending obliquely with respect to the extending direction of the intake passage 22 .

Next, when an accelerator operation unit (not shown) is operated by a driver (not shown), the throttle drum 30 is rotated by a predetermined rotation amount (rotation angle) through an accelerator wire (not shown) connected to this operation unit, and the valve is opened together with the shaft 18. 20 rotates within the intake passage 22 . As a result, air taken in from the outside of the vehicle through an air cleaner (not shown) flows from the intake passage 46 of the air duct 14 to the intake passage 22 of the intake control device 10, and after the flow rate is controlled by the opening of the valve 20, A desired amount of intake air is supplied to the cylinder chamber of the internal combustion engine through an inlet pipe 12 connected on the downstream side.

As described above, in the present embodiment, the downstream end of the air duct 14 into which outside air is taken is connected to the cylindrical portion 32 of the throttle body 16 that constitutes the intake control device 10, and the outer circumference of the cylindrical portion 32 is connected. The connecting flange 48 of the air duct 14 has a fitting recess 34 that is recessed from the surface toward the intake passage 22 and protrudes radially inward from an insertion recess 60 into which the cylindrical portion 32 is inserted. A joint protrusion 62 is formed. A communication groove 66 extending radially outward from the downstream end of the suction passage 46 is formed inside the insertion recess 60 .

When the connecting flange 48 of the air duct 14 is connected to the cylindrical portion 32 of the throttle body 16 , the fitting concave portion 34 and the fitting convex portion 62 are fitted to each other, so that the connection to the cylindrical portion 32 is performed. The flange 48 is positioned in the circumferential direction (direction of arrow D), and the communicating groove 66 of the air duct 14 can be arranged and assembled so as to face the bypass passage 44 opened at the tip of the cylindrical portion 32 .

As a result, when connecting the air duct 14 to the throttle body 16 by fitting the fitting concave portion 34 and the fitting convex portion 62, the bypass passage 44 and the communicating groove 66 are positioned relative to each other without position adjustment. It is possible to easily and reliably connect the air intake control device 10 in the state, and it is possible to reduce the number of man-hours for assembling the intake control device 10 . Further, by providing the fitting recess 34 in the throttle body 16 made of a metal material, the volume of the throttle body 16 can be reduced compared to the case where the fitting recess 34 is not provided. , the weight of the intake control device 10 can be reduced.

The intake control device according to the present invention is not limited to the above-described embodiment, and can of course adopt various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10... Intake control apparatus 14... Air duct 16... Throttle body 20... Valve 22... Intake passage 32... Cylindrical part 34... Fitting recess 36... Stepped part 44... Bypass passage 46... Intake passage 48... Connection flange 60... Insertion recess 62... Fitting protrusion 66... Communication groove

Claims (1)

A throttle body that is connected to a combustion chamber of an internal combustion engine and constitutes at least a part of an intake passage through which intake air flowing into the combustion chamber passes; a valve, and a tube connected to the upstream side of the intake passage through which the intake air taken in from the outside flows,
The throttle body has a throttle-body-side end where an upstream end of the intake passage is open, and the intake passage is formed by fitting a fitting portion of the tube to an outer peripheral surface of the throttle-body-side end. connected to the tube,
The tube has a tube-side end formed inside the fitting portion, facing the throttle-body-side end when the throttle body and the tube are connected, and communicating with the intake passage,
The intake passage includes a first main passage portion formed in the center of the throttle body side end portion where the throttle valve is disposed, and an intake passage formed outside the first main passage portion upstream and downstream of the throttle valve. a bypass passage portion that bypasses the throttle valve by communicating with the first main passage portion on the side,
An intake control device comprising: a second main passage formed at the center of the tube-side end; in
An inner peripheral portion of the fitting portion is provided with a fitting convex portion projecting toward the second main passage portion, and an outer peripheral portion of the end portion on the throttle body side is provided with a protrusion projecting toward the first main passage portion. with recessed mating recesses,
An intake control device, wherein when the throttle body and the tube are connected, the fitting protrusion and the fitting recess are fitted to communicate the bypass passage and the auxiliary passage.

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