JP2015175303A - bypass valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bypass valve device which prevents harmful effects from being exerted on adjustment of an amount of intake air passing through a bypass by inclination of a bypass valve.SOLUTION: A bypass valve device 1 includes: a box shaped bypass valve 10 which opens and closes a measuring hole 13 opened in a valve guide hole 9; and a slide piece 19 which is housed in the bypass valve 10 and driven by a motor 12. A coil spring 20 disposed between a motor 12-side first end wall 17 of the bypass valve 10 and the slide piece 19 presses a second end wall 18 of the bypass valve 10, which is located at the opposite side of the motor 12, to a tip part of the slide piece 19. The measuring hole 13 is located in a portion of the bypass valve 10 which is located at the opposite side of the motor 12.

Description

  The present invention relates to a bypass valve device that adjusts the amount of intake air that passes through a bypass in an engine intake control device that includes an intake passage provided in a throttle body and a bypass that bypasses a throttle valve of the intake passage.

  2. Description of the Related Art Conventionally, an intake control device for an engine provided with a bypass valve device includes an intake passage that is provided in a throttle body and is opened and closed by the throttle valve, an inlet hole that opens on the upstream side and the downstream side of the throttle valve of the intake passage, and And a bypass having outlet holes at both ends.

  In order to adjust the intake air amount in the bypass, the bypass valve device includes a valve guide hole having a valve seat surface in which a measurement hole leading to the outlet hole is opened and constituting a part of the bypass, and a valve guide hole A bypass valve that is slidably and non-rotatably fitted to open and close the measuring hole, and a motor that drives the bypass valve via a screw mechanism in an opening and closing direction that opens and closes the measuring hole (for example, a patent) Reference 1).

  The bypass valve includes a bottom wall, both side walls erected on both side edges parallel to the opening and closing direction of the bottom wall, a first end wall erected on the edge of the bottom wall opposite to the motor, It is comprised with the 2nd end wall standingly arranged by the edge of the motor side of a wall. In the bypass valve, the second end wall is pressed against the end of the slide piece on the motor side, interposed between the slide piece driven by the motor through the screw mechanism and the first end wall and the slide piece. An elastic member is accommodated.

  The end of the slide piece on the motor side is provided with a piece side engaging portion for preventing rotation of the slide piece around an axis parallel to the opening and closing direction. A valve side engaging portion that contacts and prevents rotation of the slide piece is provided. The metering hole is located on the opposite side of the bypass valve from the motor.

WO2013 / 058271 gazette

  However, according to the conventional bypass valve device, in order to fix the bypass valve to the slide piece by the biasing force of the coil spring, the second end wall located on the motor side of the bypass valve is connected to the motor side end of the slide piece. It is trying to press against the part. For this reason, the bypass valve on the metering hole side moves upward due to the negative pressure or the like in the metering hole, and the bypass valve tilts, which may affect the adjustment of the intake amount during idling through the bypass.

  An object of the present invention is to provide a bypass valve device that does not adversely affect the adjustment of the intake air amount passing through the bypass due to the inclination of the bypass valve in view of the problems of the prior art.

  The bypass valve device of the present invention includes an intake passage that is provided in a throttle body and is opened and closed by a throttle valve, an inlet hole that opens to the upstream side of the throttle valve of the intake passage, and a downstream side of the throttle valve of the intake passage A bypass valve device for adjusting an intake air amount in the bypass in an intake control device for an engine provided with a bypass having outlet holes opened at both ends thereof, and a valve seat surface on which a measurement hole leading to the outlet hole is opened A valve guide hole that forms a part of the bypass, a bypass valve that is slidably and non-rotatably fitted to the valve guide hole to open and close the measurement hole, and opens and closes the measurement hole A motor that drives the bypass valve via a screw mechanism in an opening and closing direction, and the bypass valve includes a bottom wall and a front wall of the bottom wall. Both side walls erected on both side edges parallel to the opening and closing direction, a first end wall erected on the motor side edge of the bottom wall, and an edge of the bottom wall opposite to the motor The bypass valve includes a slide piece that is driven by the motor through the screw mechanism, and is interposed between the first end wall and the slide piece. And an elastic member that presses the second end wall against the tip of the slide piece opposite to the motor, and the slide piece has a center axis of the screw mechanism at the tip of the slide piece. A piece side engaging portion for preventing rotation around is provided, and the bypass valve is provided with a valve side engaging portion for contacting the piece side engaging portion to prevent rotation of the slide piece. The metering hole is in front of the bypass valve. Characterized in that located on the motor side opposite.

  In the configuration of the present invention, when adjusting the intake amount of the bypass, the bypass valve is driven in the opening / closing direction by the motor, and the metering hole of the valve guide hole is opened / closed so as to have an appropriate opening degree. During this time, the second end wall of the bypass valve is pressed against the tip of the slide piece by the elastic member, so that the bypass valve is driven in the open / close direction integrally with the slide piece without rattling.

  At this time, since there is a slight gap between the bypass valve and the valve guide hole, the bypass valve may be inclined. However, the metering hole opened in the valve seat surface is located on the side opposite to the motor of the bypass valve, that is, on the second end wall side of the bypass valve pressed against the tip of the slide piece. That is, the lightweight hole is located on the side that serves as a fulcrum for tilting. For this reason, it is difficult to produce a gap between the valve seat surface and the bypass valve in the vicinity of the measuring hole. For this reason, even when the engine negative pressure or the like from the measuring hole affects the bypass valve, the bypass valve is difficult to tilt, so that the measuring hole is accurately opened and closed by the bypass valve. Therefore, the intake air amount of the bypass can be adjusted appropriately, and the engine idle control can be performed with high accuracy.

  In the present invention, the bypass valve is installed such that the bottom wall side is positioned below the gravitational direction, and the first surface of the tip end against which the second end wall is pressed against the tip end portion of the slide piece And a second surface recessed on the opposite side to the second end wall on the lower side in the gravitational direction with respect to the first surface, the second end wall is raised on the first surface side, and the second surface is raised. The bypass valve includes a raised portion having an abutting surface pressed against one surface, and the side surface of the raised portion does not have a horizontal surface portion at the uppermost portion in the gravitational direction, and both sides of the uppermost portion correspond to each other. It may incline toward the side wall and further extend in the direction of the bottom wall.

  According to this, even when a foreign object arrives between the first surface and the second end wall of the slide piece, the foreign object immediately drops along the side surface of the raised portion of the second end wall. The foreign matter can be prevented from entering between the first surface and the contact surface of the raised portion. Even if foreign matter enters between the second surface of the slide piece and the second end wall, the second surface is recessed from the first surface to the opposite side of the second end wall, so that the foreign matter is removed from there. It is possible to prevent intrusion between the first surface of the slide piece and the contact surface of the raised portion.

  Furthermore, in this case, the ridges are provided at two locations separated in the horizontal direction, and are defined by the side walls of the ridges and the first surface of the slide piece between the ridges, A passage extending in the direction to the second surface may be formed.

  According to this, since the bypass valve is pressed against the slide piece via the contact surfaces of the two raised portions, the position of the bypass valve relative to the slide piece can be stably maintained. In addition, it becomes even easier to remove foreign matter to the bottom wall side of the bypass valve through a passage defined by the side wall of the two-part raised portion and the first surface of the slide piece.

It is sectional drawing which shows the part of especially the bypass valve apparatus of the intake control apparatus which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 2 is a plan view of the front end side of a bypass valve and a slide piece in the intake control device of FIG. 1. The figure on the left is a cross-sectional view showing the second end wall of the bypass valve in FIG. 3 as seen from the inside, and the figure on the right is a figure showing the slide piece in FIG. 3 as seen from the tip side. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the bypass valve device 1 according to the embodiment is provided in an intake control device 2 for an engine. The intake control device 2 includes an intake passage 5 provided in the throttle body 3 and opened and closed by a throttle valve 4, and a bypass 6 that bypasses the throttle valve 4 portion of the intake passage 5.

  The bypass 6 has an inlet hole 7 and an outlet hole 8 at both ends that open on the upstream side and the downstream side of the throttle valve 4 of the intake passage 5 respectively. The bypass valve device 1 adjusts the amount of intake air that passes through the bypass 6 when the engine is idle.

  The bypass valve device 1 includes a valve guide hole 9 that constitutes a part of the bypass 6 and a bypass that is slidably and non-rotatably fitted to the valve guide hole 9 in order to adjust the intake air amount of the bypass 6. A valve 10 and a motor 12 that drives the bypass valve 10 via a screw mechanism 11 are provided.

  The valve guide hole 9 has a valve seat surface 14 in which a measuring hole 13 communicating with the outlet hole 8 of the bypass 6 is opened. The motor 12 drives the bypass valve 10 in the opening / closing direction A within the valve guide hole 9 to open and close the measuring hole 13 with the bypass valve 10 so as to open with an appropriate opening area.

  The bypass valve 10 includes a bottom wall 15, both side walls 16 erected on both side edges parallel to the opening / closing direction A of the bottom wall 15, and a first end erected on an end edge of the bottom wall 15 on the motor 12 side. The wall 17 and the second end wall 18 erected on the edge of the bottom wall 15 opposite to the motor 12 are configured in a box shape. The upper side of the bypass valve 10 is open.

  In the bypass valve 10, a second end wall 18 is interposed between the slide piece 19 driven by the motor 12 via the screw mechanism 11 and the first end wall 17 and the slide piece 19 of the bypass valve 10. A coil spring 20 is accommodated as an elastic member that presses against the tip of the slide piece 19 opposite to the motor 12.

  The screw mechanism 11 includes a male screw 21 provided on the drive shaft of the motor 12 and a female screw 22 provided on the slide piece 19. A through-hole 23 for allowing air to enter and exit between the space where the female screw 22 is provided and the outside thereof is provided at the tip of the slide piece 19 according to the state of the screw mechanism 11.

  As shown in FIG. 2, a piece-side engagement portion 25 for preventing the slide piece 19 from rotating around the central axis 24 of the screw mechanism 11 is provided at the distal end portion of the slide piece 19. The piece-side engagement portion 25 has two engagement surfaces 26 and 27 parallel to the opening / closing direction A (the direction of the central axis 24). The engagement surfaces 26 and 27 intersect slightly above the central axis 24 and form an angle slightly larger than 90 ° on the central axis 24 side.

  The bypass valve 10 is provided with a valve side engaging portion 28 that contacts the piece side engaging portion 25 and prevents the slide piece 19 from rotating. The valve side engagement portion 28 has a concave shape in which a cross section perpendicular to the opening / closing direction A forms a groove.

  One of the two end edges parallel to the opening / closing direction A of the convex portion at the center of the valve side engaging portion 28 is in contact with the engaging surface 26, so that one direction of the slide piece 19 as shown in the upper part of FIG. Rotation to is prevented. Further, when the other of the two end edges comes into contact with the engagement surface 27, rotation to the other is prevented as in the lower stage of FIG.

  The metering hole 13 is located on the opposite side of the bypass valve 10 from the motor 12, that is, in the vicinity of the second end wall 18 of the bypass valve 10. Therefore, the opening area of the metering hole 13 is increased when the bypass valve 10 is moved to the motor 12 side along the opening / closing direction A, and the opening area is decreased when the bypass valve 10 is moved to the opposite side of the motor 12. Opened and closed.

  As shown in the plan view of FIG. 3, the bypass valve 10 is installed so that the bottom wall 15 side is positioned below the gravitational direction. At the tip of the slide piece 19, a first surface 29a at the tip to which the second end wall 18 of the bypass valve 10 is pressed, and on the opposite side to the second end wall 18 on the lower side in the gravity direction with respect to the first surface 29a. A recessed second surface 29b is provided. The step surfaces forming the recesses constitute the engagement surfaces 26 and 27 described above. The second end wall 18 includes a raised portion 31 having a contact surface 30 that protrudes toward the first surface 29a and is pressed against the first surface 29a.

  As shown in FIG. 4, the side surface 32 of the raised portion 31 does not have a horizontal surface portion at the uppermost portion in the direction of gravity, and both sides of the uppermost portion are inclined toward the side wall 16 of the corresponding bypass valve 10. Furthermore, it extends in the direction of the bottom wall 15.

  There are two raised portions 31 that are separated in the horizontal direction. Between each raised part 31, the channel | path 33 which was demarcated by the side surface 32 of each raised part 31, and the 1st surface 29a of the slide piece 19 and extended to the 2nd surface 29b side in the gravitational direction is formed.

  In this configuration, the intake air that passes through the bypass 6 is introduced from the intake passage 5 into the bypass 6 through the inlet hole 7 that opens to the intake passage 5, through the valve guide hole 9 and the measurement hole 13, and from the outlet hole 8. It is discharged into the intake passage 5. When adjusting the amount of intake air of the bypass 6, the bypass valve 10 is driven in the opening / closing direction A by the motor 12 so that the opening area of the measuring hole 13 opened in the valve seat surface 14 becomes an appropriate value. Be controlled.

  During this time, the second end wall 18 of the bypass valve 10 is pressed against the tip of the slide piece 19 by the coil spring 20, and the contact surface 30 of the second end wall 18 is in close contact with the first surface 29 a of the slide piece 19. . For this reason, the bypass valve 10 is driven in the opening / closing direction A integrally with the slide piece 19 without rattling.

  At this time, since there is a slight gap between the bypass valve 10 and the valve guide hole 9, the bypass valve 10 may be inclined. However, the metering hole 13 opened in the valve seat surface 14 is located on the side opposite to the motor 12 of the bypass valve 10, that is, on the second end wall 18 side of the bypass valve 10 pressed against the tip of the slide piece 19. That is, the measuring hole 13 is located on the side that becomes the fulcrum of the tilt. For this reason, a gap is hardly generated between the valve seat surface 14 and the bypass valve 10 in the vicinity of the measuring hole 13.

  Therefore, even when engine negative pressure or the like from the metering hole 13 affects the bypass valve 10, the bypass valve 10 is difficult to tilt, so that the metering hole 13 is accurately opened and closed by the bypass valve 10. Thereby, the intake air amount of the bypass 6 is appropriately adjusted, and the engine idle control is performed with high accuracy.

  During this time, as shown in FIG. 4, the side surface 32 of the raised portion 31 of the second end wall 18 of the bypass valve 10 has no horizontal surface portion, so that the second end wall 18 and the first surface 29 a of the slide piece 19 are not Even when the foreign matter 34 arrives in between, the foreign matter 34 immediately falls along the side surface 32 of the raised portion 31 of the second end wall 18. Therefore, the foreign matter 34 stays on the side surface 32 of the raised portion 31, and the foreign matter 34 is prevented from entering between the first surface 29 a of the slide piece 19 and the contact surface 30 of the raised portion 31.

  Even when the foreign material 34 enters between the second surface 29 b of the slide piece 19 and the second end wall 18, the second surface 29 b is recessed from the first surface 29 a to the opposite side to the second end wall 18. Therefore, it is avoided that the foreign material 34 penetrates between the first surface 29a and the contact surface 30 of the second end wall 18 from there. Therefore, the position of the bypass valve 10 in the opening / closing direction A with respect to the slide piece 19 is accurately maintained, and the adjustment of the intake air amount by the bypass valve 10 is always performed accurately.

  Further, since the second end wall 18 of the bypass valve 10 is provided with two raised portions 31 that are separated in the horizontal direction, the bypass valve 10 is slid through the contact surface 30 of each raised portion 31. 19 is pressed against the first surface 29a at the tip. For this reason, the position of the bypass valve 10 with respect to the slide piece 19 is stably maintained.

  Further, the foreign matter 34 that has arrived above between the raised portions 31 passes through a passage 33 defined by the side wall 32 of each raised portion 31 and the first surface 29 a of the slide piece 19, and thereby the bottom wall 15 of the bypass valve 10. Easily eliminated on the side. This also effectively prevents the foreign material 34 from entering between the first surface 29a and the contact surface 30 of the second end wall 18.

  As described above, according to the present embodiment, since the second end wall 18 of the bypass valve 10 existing in the vicinity of the measuring hole 13 is pressed against the slide piece 19, the opening area of the measuring hole 13 is accurately set. And the intake air amount of the bypass 6 can be adjusted accurately.

  Further, since the side surface 32 of the raised portion 31 of the second end wall 18 always inclines downward and does not have a horizontal surface portion, the foreign matter 34 is the first of the contact surface 30 of the raised portion 31 and the tip of the slide piece 19. It is possible to prevent entry between the surface 29a and to always maintain the position of the bypass valve 10 accurately.

  Further, since the second surface 29b of the slide piece 19 is recessed from the first surface 29a to the side opposite to the second end wall 18, the foreign matter 34 is a contact surface between the first surface 29a of the slide piece 19 and the bypass valve 10. It is possible to more effectively prevent the intrusion between 30 and 30.

  Moreover, since it has the two protruding parts 31 separated in the horizontal direction, while maintaining the position with respect to the slide piece 19 of the bypass valve 10 stably, the foreign material 34 is easily excluded to the bottom wall 15 side of the bypass valve 10. Can do.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this. For example, the number of the raised portions 31 may be one. Further, instead of the coil spring 20, another elastic member may be used.

  DESCRIPTION OF SYMBOLS 1 ... Bypass valve apparatus, 2 ... Intake control apparatus, 3 ... Throttle body, 4 ... Throttle valve, 5 ... Intake passage, 6 ... Bypass, 7 ... Inlet hole, 8 ... Outlet hole, 9 ... Valve guide hole, 10 ... Bypass Valve, 11 ... Screw mechanism, 12 ... Motor, 13 ... Metering hole, 14 ... Valve seat surface, 15 ... Bottom wall, 16 ... Side wall, 17 ... First end wall, 18 ... Second end wall, 19 ... Slide piece, DESCRIPTION OF SYMBOLS 20 ... Coil spring (elastic member), 24 ... Center axis line, 25 ... Piece side engaging part, 26 ... Valve side engaging part, 29a ... 1st surface, 29b ... 2nd surface, 30 ... Contact surface, 31 ... Raised part, 32 ... side, 33 ... passage.

Claims (3)

Both ends of an intake passage provided in the throttle body and opened / closed by a throttle valve, an inlet hole opened on the upstream side of the throttle valve in the intake passage, and an outlet hole opened on the downstream side of the throttle valve in the intake passage A bypass valve device for adjusting an intake air amount in the bypass in an intake control device for an engine having a bypass
A valve guide hole having a valve seat surface in which a metering hole leading to the outlet hole opens and constituting a part of the bypass; and
A bypass valve that is slidably and non-rotatably fitted to the valve guide hole to open and close the measuring hole;
A motor that drives the bypass valve via a screw mechanism in an opening and closing direction for opening and closing the measuring hole;
The bypass valve includes a bottom wall, both side walls erected on both side edges parallel to the opening / closing direction of the bottom wall, and a first end wall erected on an end edge of the bottom wall on the motor side A second end wall erected on the edge of the bottom wall opposite to the motor,
In the bypass valve, a slide piece driven by the motor through the screw mechanism, and the second end wall interposed between the first end wall and the slide piece are disposed on the slide piece. An elastic member that presses against the tip of the motor and the opposite side is housed;
A piece-side engagement portion for preventing the slide piece from rotating around the central axis of the screw mechanism is provided at the tip of the slide piece,
The bypass valve is provided with a valve-side engagement portion that contacts the piece-side engagement portion and prevents rotation of the slide piece,
The bypass valve device, wherein the metering hole is located on the opposite side of the bypass valve from the motor. The bypass valve is installed such that the bottom wall side is located on the lower side in the direction of gravity,
The front end of the slide piece has a first surface at the front end against which the second end wall is pressed, and a second surface recessed on the opposite side to the second end wall on the lower side in the gravity direction with respect to the first surface. And
The second end wall is provided with a raised portion having a contact surface that protrudes toward the first surface and is pressed against the first surface;
The side surface of the raised portion does not have a horizontal surface portion at the uppermost portion in the direction of gravity, and both sides of the uppermost portion are inclined toward the corresponding side wall of the bypass valve, and further extend in the direction of the bottom wall. The bypass valve device according to claim 1, wherein the bypass valve device is provided. The protuberances are provided at two locations separated in the horizontal direction,
The passage defined by the side wall of each bulge and the first surface of the slide piece and extending to the second surface in the direction of gravity is formed between the bulges. 2. The bypass valve device according to 2.