Intake control device

Abstract

Provided is an intake control device that can be downsized while maintaining control accuracy of bypass intake amount. A valve opening (24) of an intake control device (1) is formed as a slit hole that gradually increases in opening width in a direction orthogonal to the axial direction from one side of a valve hole (8) in which a metering port (20) is disposed toward the other side of an upstream opening in which an upstream passage (6) is formed in the valve hole (8), and at least a portion of a valve closing portion (22) is disposed so as to be able to block the upstream opening when the bypass valve (10) is actuated in the axial direction. Assuming a reference center line (L1) that passes through the center (C1) of the area of the valve hole (8) and the midpoint (C2) of the opening width of the metering port (20) when viewed in the axial direction, the upstream opening extends beyond the reference center line (L1) from one side to the other side divided by the reference center line (L1) when viewed in the axial direction.

Description

Technical Field

[0001] The present invention relates to an intake control device having a bypass valve for adjusting the intake volume of a bypass passage, the bypass valve bypassing a portion of a valve core that adjusts the intake volume in the intake passage of a throttle body. Background Technology

[0002] Previously, there were intake control devices that opened and closed the intake passage of the throttle body by means of a valve core, and adjusted the intake volume of the bypass passage by means of a bypass valve, which bypasses the portion of the intake passage in which the valve core is disposed and connects the upstream side and the downstream side of the intake passage (for example, see Patent Document 1).

[0003] The intake control device shown in Patent Document 1 includes a bypass passage that bypasses the intake passage and is connected to the intake passage, and a bypass valve that controls the opening of the bypass passage. The bypass valve includes: a cylindrical valve chamber that opens to the upstream side of the bypass passage and has an inner surface with a metering orifice opening to the downstream side of the bypass passage; and a valve core that is slidably but non-rotatably fitted into the valve chamber to open and close the metering orifice.

[0004] The bypass valve operates within the valve orifice, adjusting the amount of bypass air flowing into the bypass passage by adjusting the amount of metering port blocked by the bypass valve within the valve orifice.

[0005] In order to finely adjust the amount of bypass air intake, the fewer the changing factors, the better the function. Therefore, in Patent Document 1, the bypass valve is configured such that when it operates in a manner that blocks the metering port, the bypass valve does not block the opening in the valve port of the upstream passage of the bypass passage.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2007-064170 Summary of the Invention

[0007] However, in the structure of Patent Document 1, the opening on the upstream side and the metering port must be separated by a large distance within the valve hole, which hinders the miniaturization of the valve mechanism.

[0008] In view of the above problems, the objective of this invention is to provide an intake control device that can achieve miniaturization while maintaining the control accuracy of bypass intake volume.

[0009] An intake control device comprising: a throttle body having an intake passage inside; A valve core is disposed inside the intake passage, and the amount of air flowing into the intake passage is adjusted by adjusting the cross-sectional area of ​​the intake passage. A bypass passage that connects the portion of the intake passage upstream of the valve core to the portion downstream of the valve core; An upstream passage that forms part of the bypass passage and is connected to the portion of the intake passage that is upstream of the valve core. A downstream passage that forms part of the bypass passage and is connected to a portion of the intake passage that is further downstream of the valve core. A valve orifice, which serves as a space connecting the upstream passage and the downstream passage, constitutes part of the bypass passage; and A bypass valve, disposed within the valve orifice, adjusts the amount of intake air flowing within the bypass passage by adjusting the cross-sectional area of ​​the bypass passage, characterized in that... The bypass valve includes: an opening / closing portion that blocks an opening, i.e., a metering port, connecting the downstream passage to the valve orifice; and a valve opening located in the opening / closing portion such that the area of ​​the metering port blocked by the opening / closing portion changes by axial movement along the direction extending from the valve orifice. The valve opening is formed as a slit orifice, which continues to the end of the bypass valve on the other side of the upstream opening configured within the valve orifice. At least a portion of the opening / closing portion is configured to block the upstream opening when the bypass valve moves along the axial direction. When viewed from a direction orthogonal to the axis and with the largest opening area of ​​the metering port, the slit orifice is configured to overlap with the upstream opening when the bypass valve is activated.

[0010] According to the present invention, the valve opening is formed as a slit orifice that continues to the end of the bypass valve that is configured to have an upstream opening in the valve orifice. When viewed from a direction orthogonal to the axial direction and in the direction with the largest opening area of ​​the metering port, the slit orifice is configured to overlap with the upstream opening when the bypass valve is actuated.

[0011] According to this structure, even when the bypass valve is in the fully closed position (maximally blocking the metering port), the portion with the widest opening of the slit orifice is located in the part of the opening / closing section facing the upstream opening. Therefore, the closed area of ​​the upstream opening is reduced, minimizing the impact on airflow control at the metering port. Furthermore, the axial distance between the upstream opening and the metering port can be set relatively small, thus contributing to the miniaturization of the valve structure. Therefore, an intake control device that achieves miniaturization while maintaining the control accuracy of the bypass intake volume can be provided.

[0012] In this invention, the slit orifice may also be formed such that the valve opening gradually increases in width along the axial direction from the side of the valve orifice in which the metering port is disposed, toward the other side of the upstream opening in the valve orifice in which the upstream passage is disposed.

[0013] According to the present invention, the side of the slit hole closest to the upstream opening is the part with the largest opening width, so the area where the upstream opening is blocked is reduced, which can further reduce the impact on the airflow control at the metering port.

[0014] In this invention, if it is assumed that there is a reference center line passing through the center of the area of ​​the valve hole and the midpoint of the opening width of the metering port when viewed from the axial direction, then when viewed from the axial direction, the upstream opening extends from one side divided by the reference center line toward the other side beyond the reference center line.

[0015] According to the present invention, the upstream opening is configured on the side that is more likely to overlap with the slit orifice, so the area of ​​the upstream opening blocked by the bypass valve is reduced, which can further reduce the impact on the airflow control at the metering port.

[0016] Invention Effects

[0017] According to the present invention, an intake control device that can be miniaturized while maintaining the control accuracy of bypass intake volume can be provided. Attached Figure Description

[0018] Figure 1 (A) is a perspective view of an intake control device according to an embodiment of the present invention. Figure 1 (B) is a perspective view of the connection, motor (motor unit) and bypass valve. Figure 1 (C) is a perspective view of the main part of the intake control device with the connection removed.

[0019] Figure 2 (A) is a three-dimensional sectional view of the intake control device. Figure 2 (B) is a cross-sectional view of the main part of the intake control device.

[0020] Figure 3 (A) is a cross-sectional view of the main part of the bypass passage. Figure 3 (B) is an explanatory diagram of the measuring port. Figure 3 (C) is a cross-sectional view of the valve orifice and the bypass valve.

[0021] Figure 4 (A) is a cross-sectional view of the upstream passage of the intake control device viewed from the direction extending from the valve orifice, i.e., axially. Figure 4 (B) is Figure 4Enlarged view of the main part of (A).

[0022] Figure 5 (A) is a three-dimensional sectional view of the main part of the bypass valve when it is nearly fully open. Figure 5 (B) is a three-dimensional sectional view of the main part of the bypass valve when it is close to the middle opening. Figure 5 (C) is a three-dimensional sectional view of the main part of the bypass valve when it is close to full closure.

[0023] Label Explanation: 1: Intake control device; 2: Intake passage; 3: Throttle body; 4: Valve core (butterfly valve); 5: Bypass passage; 6: Upstream side passage; 7: Downstream side passage; 8: Valve orifice; 10: Bypass valve; 11: Motor; 12: Sliding element; 13: First threaded part (inner diameter of sliding element, internal thread); 14: Second threaded part (outer diameter of rotary output shaft, external thread); 15: Rotary output shaft; 16: Anti-rotation part; 17: Valve side engaging part (rotation limiting part); 20: Metering port; 21: Divider part; 22: Opening and closing part; 23: Extended bottom; 24: Valve opening; C1: Center of valve orifice area; C2: Midpoint of metering port opening width; L1: Reference center line; P1: Upstream opening. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] like Figures 1-5 As shown, the intake control device 1 of the embodiment includes: a throttle body 3, which has an intake passage 2 inside; a valve core (butterfly valve) 4, which is disposed inside the intake passage 2 and adjusts the amount of intake air flowing into the intake passage 2 by adjusting the cross-sectional area of ​​the intake passage 2; and a valve shaft (not shown), which has the valve core 4 fixed thereon and is rotatably supported by the throttle body 3.

[0026] A bypass passage 5 connects the portion of the intake passage 2 upstream of the valve core 4 and the portion downstream of the valve core 4. The bypass passage 5 includes: an upstream passage 6, which forms part of the bypass passage 5 and connects to the upstream portion of the intake passage 2; a downstream passage 7, which forms part of the bypass passage 5 and connects to the downstream portion of the intake passage 2; and a valve port 8, which forms part of the bypass passage 5 as a space connecting the upstream passage 6 and the downstream passage 7.

[0027] A bypass valve 10 is provided in the valve orifice 8. The bypass valve 10 adjusts the amount of intake air flowing in the bypass passage 5 by adjusting the cross-sectional area of ​​the bypass passage 5.

[0028] In addition, the intake control device 1 includes: a motor 11 that generates a force to actuate the bypass valve 10; and a slider 12 that is separately configured from the bypass valve 10 and engages with the bypass valve 10 to transmit the force generated by the motor 11 to the bypass valve 10, causing the bypass valve 10 to actuate in the direction extending along the valve port 8.

[0029] A cylindrical internal space 31 for mounting a motor 11 is formed on the throttle body 3, and an annular opening 32 with a diameter larger than the diameter of the internal space 31 is formed at the end of the internal space 31. The motor 11 is included in a motor unit 35, which has a large-diameter resin portion surrounding the motor 11 and a connection portion 34 for connecting wiring.

[0030] A sealing plate 36 is provided between the front end of the motor 11 and the bottom of the internal space for sealing. An elastic sealing member (O-ring) 37 is provided on the opening 32 to seal the interface with the large-diameter portion of the motor unit 35. A spring 38 is provided in the motor unit 35 to push the sliding member 12 to the other side. The motor unit 35 is fixed to the throttle body 3 via a retaining plate 40 and a fixing member (screw) 41. The large-diameter portion has an abutment surface 42 that abuts against the throttle body 3 and an enlarged extension 43 extending from a portion of the abutment surface 42.

[0031] A sensor unit 44 with a built-in intake pressure sensor, opening sensor and intake temperature sensor is provided on the throttle body 3.

[0032] The slider 12 has a first threaded portion 13 extending in the extending direction of the valve hole 8. The motor 11 has a second threaded portion 14 extending in the extending direction of the valve hole 8 as a rotary output shaft 15. The first threaded portion 13 engages with the second threaded portion 14 to rotate the rotary output shaft 15, thereby causing the slider 12 to move in the extending direction of the valve hole 8.

[0033] An anti-rotation portion 16 is provided on the bypass valve 10 to prevent the bypass valve 10 from rotating relative to the throttle body 3 around the rotation axis of the motor 11. The bypass valve 10 also has a valve-side engagement portion (rotation restriction portion) 17 that engages with the sliding member 12 to restrict the rotation of the bypass valve 10 and the sliding member 12 relative to each other around the rotation axis of the motor 11. The sliding member 12 also has a member-side engagement portion (rotation restriction portion) that engages with the valve-side engagement portion 17.

[0034] The metering port 20 of the bypass valve 10 and the downstream passage 7 on the valve port 8 is located on the side of the valve port 8 that is further in the extension direction of the valve port 8 than the portion of the upstream passage 6 in the valve port 8.

[0035] The bypass valve 10 has at least a partition 21 and an opening / closing part 22. The partition 21 divides the valve orifice 8 into one side and the opposite side. The opening / closing part 22 adjusts the cross-sectional area of ​​the bypass passage 5 by blocking the metering port 20. The opening / closing part 22 is located on the opposite side more than the partition 21.

[0036] Furthermore, the valve-side engaging portion 17 extends integrally to one side from the partition wall portion 21. Viewed from the direction extending from the valve hole 8, an extended bottom 23 is formed on the partition wall portion 21, which is formed as a recess that is more recessed to one side than the other surface of the partition wall portion 21 on the other side within the range where the valve-side engaging portion 17 is disposed.

[0037] Furthermore, viewed from the extending direction of the valve orifice 8, the extending bottom 23 extends radially outward toward the direction where the opening / closing portion 22 is disposed, beyond the center C of the rotating output shaft 15. On the other side (forward side) of the opening / closing portion 22 of the bypass valve 10, a slit-shaped valve opening (slit hole) 24 is formed that gradually expands from one side to the other side (from the backward side to the forward side), the valve opening 24 extends to the end of the bypass valve 10 and opens to the other side (forward side).

[0038] Next, the location of the upstream passage will be described in detail.

[0039] like Figure 4 , Figure 5 As shown, the valve opening 24 is formed as a slit orifice that extends to the end on the other side where the upstream opening is located within the valve hole 8. More specifically, the valve opening 24 is formed as a slit orifice that gradually increases in width in the axial direction of the valve hole 8, from the side where the metering port 20 is located within the valve hole 8 toward the other side where the upstream passage 6 is located within the valve hole 8.

[0040] At least a portion of the opening / closing section 22 is configured to block the upstream opening when the bypass valve 10 is operated axially (in the direction in which the valve hole 8 extends).

[0041] Furthermore, when viewed from a direction orthogonal to the axial direction and with the largest opening area of ​​the metering port 20, the valve opening (slit orifice) 24 is configured to overlap with the upstream opening when the bypass valve 10 is actuated. More specifically, assuming a reference center line L1 passing through the center of the area C1 of the valve orifice 8 and the midpoint C2 of the opening width of the metering port 20 when viewed from the axial direction, the upstream opening P1 extends beyond the reference center line L1 from one side to the other side when viewed from the axial direction.

[0042] Next, the function of the intake control device 1 will be explained.

[0043] like Figure 5As shown in (A), the bypass valve 10 is located in the retracted end (one side) position (fully open). In this case, the valve opening (slit orifice) 24 of the bypass valve 10 is located at the metering port 20. The upstream passage 6 of the bypass passage 5 is connected to the downstream passage 7.

[0044] like Figure 5 As shown in (B), the motor 11 is activated, causing the bypass valve 10 to move to the middle position (middle opening position) on the forward side (the other side). In this way, the opening and closing part 22 of the bypass valve 10 partially blocks the metering port 20 opened in the downstream passage 7.

[0045] like Figure 5 As shown in (C), the motor 11 is activated, causing the bypass valve 10 to move to the forward end (the other end) position (fully closed position). This blocks the metering port 20 of the downstream passage 7 from the opening / closing portion 22 of the bypass valve 10. At this time, the front end of the bypass valve 10 partially blocks the upstream passage 6, but assuming there is an area center C1 through the valve orifice 8 (refer to...). Figure 4 The reference center line L1, which is the midpoint of the opening width of the valve opening 24 and the metering port 20, extends beyond the reference center line L1 from one side to the other when viewed from the axial direction. Therefore, the valve opening 24 faces the opening portion of the upstream passage 6, minimizing the reduction of the opening area of ​​the upstream passage 6, so as to maintain a larger opening area.

[0046] The effects of the intake control device 1 described above will be described below.

[0047] Even when the bypass valve 10 is in the fully closed position (maximally blocking the metering port 20), the portion of the slit orifice with the widest opening is located in the portion of the opening / closing section 22 facing the upstream opening. Therefore, the closed area of ​​the upstream opening is reduced, minimizing the impact on airflow control at the metering port 20. Furthermore, the axial distance between the upstream opening and the metering port 20 can be set relatively small, thus contributing to the miniaturization of the valve structure. Therefore, an intake control device 1 can be provided that achieves miniaturization while maintaining the control accuracy of the bypass intake volume.

[0048] Furthermore, embodiments of the present invention have been described, but the present invention is not limited thereto. For example, the intake control device 1 can be applied even if the bypass passage 5 of the intake control device 1 is a labyrinth structure. Further, it is also possible to view the intake control device 1 in the direction extending from the valve orifice, i.e., axially. Figure 4 The upstream passage 6 is configured such that the lower edge of the upstream passage becomes the tangent of the arc on the lower side of the valve hole 8. That is, the present invention is not limited to the embodiments as long as it achieves the functions and effects of the present invention.

[0049] Industrial utilization potential

[0050] The intake control device 1 of the present invention is applicable to motorcycles.

Claims

1. An intake control device, comprising: Throttle body, which has an intake passage inside; A valve core is disposed inside the intake passage, and the amount of air flowing into the intake passage is adjusted by adjusting the cross-sectional area of ​​the intake passage. A bypass passage that connects the portion of the intake passage upstream of the valve core to the portion downstream of the valve core; An upstream passage that forms part of the bypass passage and is connected to the portion of the intake passage that is upstream of the valve core. A downstream passage that forms part of the bypass passage and is connected to a portion of the intake passage that is further downstream of the valve core. A valve orifice, which serves as a space connecting the upstream passage and the downstream passage, constitutes part of the bypass passage; and A bypass valve, disposed within the valve orifice, adjusts the amount of intake air flowing within the bypass passage by adjusting the cross-sectional area of ​​the bypass passage, characterized in that... The bypass valve includes: an opening / closing portion that blocks an opening, i.e., a metering port, connecting the downstream passage to the valve orifice; and a valve opening located in the opening / closing portion such that the area of ​​the metering port blocked by the opening / closing portion changes by axial movement along the direction extending from the valve orifice. The valve opening is formed as a slit orifice, which continues to the end of the bypass valve on the other side of the upstream opening configured within the valve orifice. At least a portion of the opening / closing portion is configured to block the upstream opening when the bypass valve moves along the axial direction. When viewed from a direction orthogonal to the axis and with the largest opening area of ​​the metering port, the slit orifice is configured to overlap with the upstream opening when the bypass valve is activated. The valve opening, which serves as the slit orifice, gradually increases in width along the axial direction from the side of the valve orifice where the metering port is located to the other side of the upstream opening in the valve orifice where the upstream passage is located.

2. The intake control device according to claim 1, characterized in that, If we assume there is a reference center line that passes through the center of the area of ​​the valve orifice and the midpoint of the opening width of the metering port when viewed from the axial direction, then when viewed from the axial direction, the upstream opening extends beyond the reference center line from one side to the other.

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