JP6634176B1 - Fluid valve structure used for intake control device - Google Patents

Abstract

An object of the present invention is to more reliably prevent a spring from falling off while improving the assemblability of a spring for urging a rotational force in a fluid valve structure used in an intake control device. In an intake control device, a spring is interposed between a throttle plate connected to a shaft and a throttle body, and a spring is formed at a second end in the axial direction. An arm portion 54 extending from the end winding portion 48, a hook portion 56 bent to the arm portion 54, and further bent to the hook portion 56 to extend substantially parallel to the arm portion 54; A second hook 52 having an extension hook portion 58 is provided. On the other hand, the throttle plate 18 is provided with a locking portion 72 protruding from the outer edge of the throttle plate 18 toward the throttle body 12, and the locking portion 72 includes A connection piece 76 is formed at a small second height H2 with respect to the fall-off prevention piece 74 and is connected to the second main body 62. Then, the second hook 52 of the spring 38 is engaged so as to surround three sides of the connection piece 76 in the locking portion 72. [Selection diagram] FIG.

Description

  The present invention relates to a fluid valve structure used for an intake control device for controlling an intake amount supplied to an internal combustion engine.

  BACKGROUND ART Conventionally, an intake control device that controls a flow rate (intake amount) of air supplied to an internal combustion engine mounted on a vehicle has been used. For example, an intake control device disclosed in Patent Document 1 includes a throttle body, and a throttle valve rotatably provided in an intake passage of the throttle body, and an end of a valve shaft connected to the throttle valve. A throttle lever protruding outside the throttle body, a throttle lever is provided, and a return spring is provided between the throttle lever and the throttle body to apply a rotational force about the axis of the valve shaft. ing.

  Then, a rotational force is applied to the valve shaft and the throttle valve via the throttle lever under the elasticity of the return spring, so that the throttle valve rotates in the intake path to be fully closed.

JP 2015-172365A

  The return spring of the fluid valve structure used in the intake control device as described above is configured so that it cannot be removed after being assembled to the throttle body and the throttle lever. There is a problem that the performance is reduced.

  The present invention has been made in consideration of the above-described problems, and an intake control device capable of more reliably preventing falling off while improving assemblability of a spring for biasing a rotational force. It is an object to provide a fluid valve structure to be used.

In order to achieve the above object, an aspect of the present invention provides a valve body having a passage through which a fluid passes, a valve body that adjusts a flow rate of the fluid by adjusting a cross-sectional area of the passage, and a valve body. A valve shaft that is rotatably supported and has a valve body fixed thereto, and a spring that is engaged with both the valve body and the valve shaft and urges the valve shaft to rotate,
The valve body includes a support portion that rotatably supports the valve shaft, and a cylindrical portion formed outside the support portion and provided substantially coaxially with a rotation axis that is a rotation center of the valve shaft,
On the valve shaft, a rotating plate provided so as to extend in a direction substantially orthogonal to the rotation axis and restricting movement of the spring in the direction of the rotation axis is fixed,
The spring is a torsion spring having a winding portion in which the element wire is wound a plurality of times around the reference axis, and is wound between the rotary plate and the valve body in a state of being compressed in the direction of the reference axis. At least a part of the turning portion is arranged on the outer peripheral side of the cylindrical portion,
In a fluid valve structure in which the rotating plate includes an inner diameter guide that rises in the direction of the rotation axis, and the inner diameter guide restricts movement of at least a part of the winding part to the rotation axis side.
At the end of the spring, which is the direction of the reference axis and is on the rotating plate side, an end winding portion formed by bending a wire in a substantially circular shape, an arm portion extending in a tangential direction of the end winding portion, and an arm portion A hook portion that bends and extends with respect to the hook portion, and an extension hook that further bends with respect to the hook portion and extends substantially in parallel with the extending direction of the arm portion and in a direction opposite to the extending direction of the arm portion. Department and
The rotating plate includes a rotation locking portion that engages with the hook portion and regulates relative rotation of the hook portion and the valve shaft around the rotation axis,
The rotation locking portion includes a fall-off prevention piece having a first height in a direction orthogonal to the direction of the rotation axis when viewed from the direction of the arm axis, which is the center axis of the arm, and a rotation plate with respect to the fall-off prevention piece. A locking piece disposed on the side and having a second height smaller than the first height,
The first height is set to be larger than the shortest distance between the arm and the extension hook, and the second height is set to be smaller than the shortest distance.

  According to the present invention, the fluid valve structure used in the intake control device includes a spring that is engaged with both the valve shaft and the valve body to which the valve body is connected and urges the valve shaft to rotate. The spring is compressed in the direction of the axis of rotation of the valve shaft between the rotary plate and the valve body, which is formed of a torsion spring and connected to the valve shaft, and has at least a winding portion on the outer peripheral side of the cylindrical portion supported by the valve shaft. A part is arranged, and the movement to the rotation axis side is regulated by an inner diameter guide that rises in the direction of the rotation axis with respect to the rotation plate.

Further, the spring has an arm extending in the tangential direction of the end winding portion, a hook extending from the arm, and a hook at an end on the rotating plate side in the direction of the reference axis. And an extended hook portion extending substantially parallel to the extending direction of the arm portion and extending in the opposite direction to the arm portion. On the other hand, the rotation plate is provided with a rotation locking portion that is engaged with the hook portion and regulates relative rotation, and has a first height in a direction orthogonal to the direction of the rotation axis when viewed from the direction of the arm axis of the arm portion. And a locking piece having a second height smaller than the first height and disposed on the rotating plate side with respect to the falling prevention piece. The first height is set to be larger than the shortest distance between the arm and the extension hook, and the second height is set to be smaller than the shortest distance.

  Therefore, the spring that urges the rotational force to the valve shaft is provided with the rotation locking portion of the rotation locking portion with respect to the locking piece formed with the second height lower than the falling-off preventing piece having the first height. With the hook portion engaged, the spring was compressed in the axial direction and the inner diameter guide restricted movement to the rotation axis side, so that the hook portion was engaged with the rotation locking portion and was prevented from falling off. In this state, it can be assembled between the valve body and the rotating plate.

  As a result, the spring can be engaged with both the valve body and the valve shaft and assembled without deteriorating the assemblability of the spring, and the arm, hook, and extension can be extended with respect to the rotation locking portion. By engaging the hook portion, the movement of the valve shaft in the direction of the rotation axis of the valve shaft is regulated by the falling-off preventing piece formed higher with respect to the locking portion, and the spring is reliably prevented from falling off.

  According to the present invention, the following effects can be obtained.

That is, when the spring is engaged with both the valve shaft and the valve body to which the valve element is connected and assembled, the first height of the drop-preventing piece of the rotation locking portion provided on the rotary plate is set to the spring height. In this case, the length is greater than the shortest distance between the arm portion and the extension hook portion provided substantially in parallel with each other, and is greater than the second height of the locking piece formed on the rotary plate side with respect to the falling-off prevention piece. . Therefore, the arm, hook, and extension hook of the spring are engaged with the locking pieces, and the spring is compressed in the direction of the rotation axis of the valve shaft to move the spring toward the rotation axis by the inner diameter guide of the rotary plate. Can be assembled between the valve body and the rotating plate in a state where is regulated.

  As a result, in the fluid valve structure used in the intake control device, it becomes possible to engage and assemble both the valve body and the valve shaft without lowering the assemblability of the spring. By engaging the arm, the hook and the extension hook, the drop-off prevention piece that is formed high with respect to the locking part regulates the movement of the hook in the direction of the rotation axis, thereby ensuring that the spring comes off. Can be prevented.

1 is an overall front view of an intake control device to which a fluid valve structure according to an embodiment of the present invention is applied. FIG. 2 is an enlarged front view of the vicinity of a locking portion of a throttle plate of the intake control device shown in FIG. 1 as viewed from an axial direction of an arm portion of a spring. FIG. 3A is an external perspective view of a spring in a state where the spring is assembled to the intake control device, and FIG. 3B is a front view of a throttle plate of the intake control device as viewed from a throttle body side. 4A is an external perspective view of a shaft to which a throttle plate is connected, and FIG. 4B is a front view showing a state in which the spring shown in FIG. 3B is being assembled to the throttle plate.

  Preferred embodiments of the fluid valve structure used in the intake control device according to the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 denotes an intake control device using a fluid valve structure according to an embodiment of the present invention.

  As shown in FIG. 1, the intake control device 10 includes, for example, a throttle body (valve body) 12, a shaft (valve shaft) 14 rotatably supported inside the throttle body 12, and a shaft 14 A valve (valve element) 16 connected to the throttle body 12 and rotatably provided inside the throttle body 12, and a throttle plate (rotary plate) 18 connected to one end of the shaft 14 and rotating in conjunction with an accelerator operation unit of the vehicle. And FIG. 1 is a front view of the intake control device 10 as viewed from the upstream side.

  The throttle body 12 is formed of, for example, a metal material, and an intake passage (passage) 20 having a circular cross section penetrates the center thereof, and an inlet pipe (not shown) is provided at one end downstream of the intake passage 20. An air duct (not shown) is connected to the other end on the upstream side of the intake passage 20 to introduce outside air.

  A shaft 14 is inserted into the intake passage 20 so as to be orthogonal to the direction in which the intake passage 20 extends, and a disc-shaped valve 16 is connected to the axial center of the shaft 14 via a screw 22. The flow rate of air (fluid) flowing in the intake passage 20 is controlled by opening and closing the valve 16 in the intake passage 20. The intake passage 20 communicates with a bypass passage 26 that bypasses the upstream side and the downstream side of the valve 16, and a valve passage 30 to which air is supplied under a driving action of a solenoid valve 28.

  In the throttle body 12, shaft holes (supporting portions) 32 extending outward in a substantially horizontal direction (arrows A and B directions) perpendicular to the intake passage 20 are formed, respectively. The shaft 32 is rotatably supported by inserting both ends of the shaft 14 therethrough.

  Further, on one side surface of the throttle body 12 along the axial direction of the shaft 14, a cylindrical portion 34 protruding cylindrically in a direction (direction of an arrow A) orthogonal to the extending direction of the intake passage 20, And an engagement portion 36 formed to be separated upward (in the direction of arrow C1). A shaft hole 32 is formed inside the cylindrical portion 34, and one end side of the shaft 14 (in the direction of arrow A) is inserted therethrough. At the same time, a spring 38 is inserted outside the cylindrical portion 34.

  One end and the other end of the shaft 14 respectively protrude to the outside of the throttle body 12 through the shaft hole 32, and the one end protruding outside from the cylindrical portion 34 is connected to the throttle plate 18 at the other end. A detection sensor 40 capable of detecting the amount of rotation of the shaft 14 is connected to the end. The opening of the valve 16 connected to the shaft 14 is detected by detecting the amount of rotation of the shaft 14 by the detection sensor 40.

  As shown in FIGS. 1 to 3B, the spring 38 is, for example, a torsion spring formed by winding the element wire 42 in the same diameter around the axis (reference axis) D1 a plurality of times in a coil shape. .

  The spring 38 includes a winding part 44 formed by winding the wire 42 a plurality of times, a first end winding part 46 formed at one end side in the axial direction (arrow B direction) of the winding part 44, The turning part 44 includes a second end winding part 48 formed on the other end side in the axial direction (the direction of arrow A). At the end of the first end winding portion 46, a first hook 50 is formed, which is engaged with the engaging portion 36 of the throttle body 12, and at the end of the second end winding portion 48, the throttle plate 18 is provided. A second hook 52 to be locked is formed, and the first end winding portion 46 and the second end winding portion 48 have an elastic force in a direction away from each other about the axis D1 of the spring 38. .

  As shown in FIGS. 2 to 3B, the first hook 50 linearly extends from the first end winding portion 46 toward the tangential direction of the winding portion 44 (the direction of the arrow E1), and then extends outward (arrow C1). Direction).

  The second hook 52 is provided at a position radially opposite (in the direction of arrow A) from the first hook 50 with respect to the axis D1 of the spring 38, and is opposite to the direction in which the first hook 50 is folded back. It is formed in a substantially U-shape folded outward (in the direction of arrow C2).

  The second hook 52 is linearly formed at a predetermined length in a tangential direction (arrow E1 direction) from a second end winding portion 48 formed on the other end side in the axial direction (arrow B direction) of the winding portion 44. An extended arm 54, a hook 56 bent outward with respect to the tip of the arm 54, and folded back from the lower end of the hook 56 so as to be parallel to the arm 54; And an extension hook 58 extending in the opposite direction (direction of arrow E2).

  That is, the spring 38 is bent such that the first hook 50 and the second hook 52 are in opposite directions to the axis D1 about the winding portion 44 as viewed from the axial direction of the shaft 14 shown in FIG. 3B. It is formed.

  The first and second hooks 50 and 52 are engaged with the throttle body 12 and the throttle plate 18, respectively, with the spring 38 being inserted through the outer peripheral side of the cylindrical portion 34 of the throttle body 12. The throttle plate 18 is provided so as to be able to apply a rotational force.

  As shown in FIGS. 1, 2, and 3B to 4B, the throttle plate 18 includes first and second body portions 60 and 62 formed in a substantially disc shape in an axial direction (directions of arrows A and B). The second main body 62 is on the throttle body 12 side (arrow B direction), and the first main body 60 is separated from the throttle body 12 with respect to the second main body 62 (arrow B). A direction).

  The first main body 60 is coaxially connected to the center of the second main body 62 by fitting the center of the first main body 60 with the center of the second main body 62. The first inner diameter guides 64a and 64b and the second inner diameter guide 66 that protrude in the axial direction toward the main body 62 side (the direction of arrow B) are formed.

  The first inner diameter guides 64a, 64b and the second inner diameter guide 66 are provided on the same circumference with respect to the axial center of the first main body 60 and at equal intervals from each other along the circumferential direction. The first inner diameter guides 64a and 64b are two, and the second inner diameter guide 66 is one. That is, the first inner diameter guides 64a and 64b and the second inner diameter guide 66 are arranged on a circumference that is concentric with the shaft center of the shaft 14, the first and second main body parts 60 and 62.

  Further, the first inner diameter guides 64a and 64b pass through the axis (rotation axis) D3 of the shaft 14 when viewed from the axis direction of the shaft 14 shown in FIG. When a plane parallel to (axis line) D2 is defined as a first reference plane S1, it is disposed above (in the direction of arrow C1) orthogonal to the first reference plane S1.

  The second main body 62 is provided between the first main body 60 and the throttle body 12, one end of the shaft 14 is connected to the center of the second main body 62, and is provided between the first main body 60 and the first main body 60. For example, a cable 68 (see FIGS. 1 and 2) connected to an accelerator operation unit of the vehicle is connected to the groove recessed inward in the radial direction. When the driver (not shown) operates the accelerator operation section, the cable 68 is pulled, and the throttle plate 18 including the first and second main body sections 60 and 62 is rotated, whereby the shaft 14 is integrally formed. Rotate.

  Further, the second main body 62 is formed with three holes 70 on the same circumference with respect to the axis center thereof and at regular intervals from each other. The first inner diameter guides 64a, 64b and the second inner diameter guide 66 are inserted through the first inner diameter guides 64a, 64b and the second inner diameter guide 66, respectively. Direction).

  At this time, the protruding height of the second inner diameter guide 66 is higher than the protruding height of the pair of first inner diameter guides 64a, 64b, as shown in FIG. 4A, and the axis of the first inner diameter guides 64a, 64b. The protruding height (protruding amount) along the direction is set to be smaller than twice the wire diameter (thickness) of the strand 42 constituting the spring 38.

  Then, as shown in FIG. 3B, when the spring 38 is disposed between the throttle plate 18 and the throttle body 12, the first inner diameter guides 64a and 64b and the second inner diameter guide The inner peripheral surface of the two end winding portion 48) is arranged outside the first inner diameter guides 64a and 64b and the second inner diameter guide 66.

  The inner peripheral surface of the spring 38 comes into contact with the first inner diameter guides 64 a and 64 b and the second inner diameter guide 66, so that movement in the radial direction (rotational axis side) is restricted. The spring 38 is held substantially coaxially.

  Further, as shown in FIGS. 1, 2, 3 </ b> B and 4 </ b> B, a locking portion (rotation locking) protruding toward the throttle body 12 side (arrow B direction) is provided on an outer edge portion of the second main body portion 62. Section) 72 is formed. The locking portion 72 is formed of a substantially rectangular plate protruding perpendicular to the second main body portion 62, and viewed from the axial direction of the arm portion 54 of the spring 38 shown in FIG. And a fall prevention piece 74 having a first height H1 in a direction (arrows C1 and C2 directions) perpendicular to the axis D3 of the second main body 62. The fall prevention piece 74 is bent from the outer edge of the second main body 62 and stands upright. A connection piece (locking piece) 76 for connecting to the second main body 62.

  The connecting piece 76 has a second height H2 that is narrow in a direction (arrows C1 and C2 directions) orthogonal to the axis D3 of the shaft 14 when viewed from the axial direction of the arm 54 shown in FIG. The second height H2 is formed to be smaller than the first height H1 of the fall prevention piece 74 (H2 <H1). That is, the connection piece 76 is formed to be lower (upward in the direction of the arrow C1) and lower (upward in the direction of the arrow C2) of the drop-off prevention piece 74, respectively.

  Further, the first height H1 of the falling-off preventing piece 74 is set to be larger than the shortest distance L1 between the arm portion 54 and the extension hook portion 58 of the spring 38 shown in FIG. 3A (H1> L1), while the connecting piece is formed. The second height H2 of 76 is set smaller than the shortest distance L1 (H2 <L1).

  Further, the locking portion 72 includes a locking edge portion 78 which is an edge of the connection piece 76 which is orthogonal to the axis D3 of the shaft 14 when viewed from the axial direction of the arm portion 54 of the spring 38 shown in FIG. And a connecting edge 82 for connecting the falling-off prevention piece 74 to the falling-off prevention edge 80 which is an edge in the orthogonal direction. The connection edge portion 82 is formed in a stepped shape including an arc portion and a straight portion in the vertical direction (the directions of arrows C1 and C2) of the locking portion 72, respectively.

  Furthermore, when viewed from the axial direction of the arm portion 54 shown in FIG. 2, the locking portion 72 is a virtual circle having a radius R equal to the shortest distance L1 between the arm portion 54 and the extension hook portion 58 (see FIG. 3A). When F is drawn with the connection edge 82 as a center, the virtual circle F is formed so as to always intersect with the falling-off preventing piece 74.

  Also, when viewed from the axial direction of the shaft 14 shown in FIG. 3B, when the regions vertically divided by the axis D2 of the arm portion 54 of the spring 38 are the first region T1 and the second region T2, respectively, The shaft 14 is arranged in a first region T1 which is in the direction of the arrow C1 (first direction), and the second hook 52 is arranged in a second region T2 which is in the downward direction (in the direction of arrow C2, second direction).

  Further, when viewed from the axial direction of the shaft 14, a plane passing through the axis D <b> 3 (axial center) of the shaft 14 and orthogonal to the axis D <b> 2 of the arm 54 of the spring 38 is defined as a second reference plane S <b> 2. Above the first reference surface S1 (in the direction of the arrow C1) parallel to the axis D2 of the arm portion 54 of the spring 38 and passing through the axis D3 of the spring 38, the inner peripheral surface of the first end winding portion 46 and the second The distance from the end winding intersection point P1 where the reference surface S2 intersects to the hook end 84 which is the tip of the extension hook portion 58 is defined as a hook distance L2, and the second reference surface S2 is larger than the first reference surface S1. The distance from the shaft intersection P2 where the outer peripheral surface of the shaft 14 intersects with the second reference plane S2 on the upper side (in the direction of the arrow C1) to the point P3 farthest from the shaft intersection P2 in the connection piece 76 at the locking distance. When the L3, toward the locking distance L3 to the hook distance L2 is formed to be smaller (L2> L3).

  The intake control device 10 using the fluid valve structure according to the embodiment of the present invention is basically configured as described above. Next, a spring 38 is provided to the throttle body 12 and the throttle plate 18. The case of assembling will be described.

  First, the outer peripheral side of the shaft 14 to which the throttle plate 18 is connected as shown in FIG. 4A is set on the spring 38 so that the second hook 52 (the second end winding portion 48) is on the throttle plate 18 side (the direction of arrow A). After that, the second hook 52 is engaged with the locking portion 72 of the throttle plate 18.

  Specifically, the arm portion 54 of the second hook 52 is arranged so as to be on the upper side of the connection piece 76 of the locking portion 72, and the spring 38 contacts the outer peripheral surface of the shaft 14 as shown in FIG. 4B. It is eccentric in the radial direction toward the locking portion 72 to the position, and the second hook 52 is inclined by a predetermined angle with respect to the locking portion 72. As a result, the distance (shortest distance L1) between the arm portion 54 and the extension hook portion 58 of the second hook 52 in the vertical direction (the direction of the arrows C1 and C2) is smaller than the second height H2 of the connection piece 76. However, a large clearance between the arm portion 54 and the connection piece 76 and a clearance between the extension hook portion 58 and the connection piece 76 can be ensured.

  The arm 54 extends along the locking edge 78 of the connecting piece 76, and the extension hook 58 extends along the lower locking edge 78, so that the arm 54 and the extension hook 58 When the connection piece 76 is inserted therebetween, the hook portion 56 is arranged so as to go around the outside of the connection piece 76, and the second hook 52 is engaged with the connection piece 76.

  That is, as shown in FIG. 3B, in the axial direction of the throttle plate 18 (in the directions of arrows A and B), the second hook 52 is provided with the first hook 52 with respect to the falling-off preventing piece 74 formed higher than the connecting piece 76. And the connection piece 76 on the side of the second main body parts 60 and 62 (the direction of the arrow A) is arranged so as to go around three sides.

  Next, the shaft 14 is inserted into the shaft hole 32 of the cylindrical portion 34 of the throttle body 12 from the other end, and the cylindrical portion 34 is inserted into the spring 38 so as to cover the outer peripheral side of the cylindrical portion 34. Then, the first hook 50 is engaged with the engaging portion 36 of the throttle body 12.

  Accordingly, when viewed from the throttle body 12 side shown in FIG. 3B, the rotation of the spring 38 in the clockwise direction (the direction of the arrow G1) with respect to the axis D2 (axial center) of the shaft 14 is restricted. At this point, the spring 38 is not yet compressed in the axial direction (the directions of arrows A and B).

  Then, after rotating the shaft 14 together with the throttle plate 18 in the opening direction of the valve 16 (clockwise direction, arrow G1 direction) against the resilience of the spring 38, the shaft 14 is shown in FIGS. The shaft 14 and the throttle plate 18 are moved toward the throttle body 12 (in the direction of arrow B) so that the first end winding portion 46 is in contact with the throttle body 12 and the spring 38 is moved in the axial direction (in the direction of arrow B). Direction).

  At this time, the second end winding portion 48 of the spring 38 is located radially outward around the shaft 14 with respect to the first inner diameter guides 64a and 64b and the second inner diameter guide 66 of the throttle plate 18. The spring 38 is held so as to be substantially coaxial with the shaft 14 and the cylindrical portion 34 under the guiding action of the first inner diameter guides 64a and 64b and the second inner diameter guide 66, and the movement in the radial direction is restricted. In this state, it is compressed in the axial direction (the directions of arrows A and B).

  Finally, in the throttle body 12, an engagement ring (not shown) is attached to an end of the shaft 14 that protrudes toward the detection sensor 40 (in the direction of arrow B) through the intake passage 20, so that the insertion direction of the shaft 14 is After restricting the movement in the axial direction (the direction of arrow A), the valve 16 is fixed to the shaft 14 exposed in the intake passage 20 with the screw 22.

  Thereby, the assembly of the spring 38 to the throttle body 12 and the throttle plate 18 is completed, and the resilience of the spring 38 causes the throttle plate 18 to rotate counterclockwise when viewed from the axial direction of the shaft 14 shown in FIG. 3B. (In the direction of arrow G2), and the valve 16 is fully closed in the intake passage 20 via the shaft 14 connected to the throttle plate 18.

  Next, the operation of the intake control device 10 in which the spring 38 is assembled as described above will be described.

  First, in an idling state in which the internal combustion engine is started and the accelerator operation portion of the vehicle is not operated, the vehicle is in a fully closed state in which the gap between the valve 16 and the inner peripheral surface of the intake passage 20 is minimized in the intake passage 20. Idle intake air supplied through an air duct not shown flows through the gap and at the same time to the downstream side of the valve 16 through the bypass passage 26, and then is supplied to the cylinder chamber of the internal combustion engine via an inlet pipe (not shown). .

  Next, when a driver (not shown) operates the accelerator operation unit of the vehicle, the throttle plate 18 rotates against the elastic force of the spring 38 through a cable 68 connected to the accelerator operation unit, and the throttle plate 18 rotates. By rotating the plate 18 by a predetermined rotation amount (rotation angle), the valve 16 rotates together with the shaft 14 in the intake passage 20. When the valve 16 rotates, the gap increases away from the inner peripheral surface of the intake passage 20.

  Then, the air taken in from the outside of the vehicle flows through the air duct (not shown) to the intake passage 20 of the intake control device 10, and after the flow rate of the air is controlled by the opening degree of the valve 16, the air is connected to the downstream side. A desired intake air amount is supplied from the inlet pipe to the cylinder chamber of the internal combustion engine.

  When the driver's force for operating the accelerator operation unit decreases, the spring force of the spring 38 applies a rotational force to the throttle plate 18, and the shaft 14 and the valve 16 move together with the throttle plate 18 in the opposite direction. By rotating in the direction indicated by the arrow G2 in FIG. 3B, it returns to the fully closed state, which is the initial state.

  As described above, in the present embodiment, the spring 38 is interposed between the throttle body 12 and the shaft 14 to which the valve 16 is connected, which constitutes the intake control device 10. Between the throttle plate 18 and the throttle body 12 connected to the end of the shaft 14, the shaft 14 is compressed in the axial direction (the direction of arrows A and B) of the shaft 14, and is compressed on the outer peripheral side of the cylindrical portion 34 through which the shaft 14 is inserted. At the same time, the second end winding portion 48 on the throttle plate 18 side (in the direction of arrow A) is provided with an arm portion 54 extending in a tangential direction, and is bent and extends with respect to the arm portion 54. A hook portion 56, and an extended hook portion 58 that is further bent with respect to the hook portion 56 and extends substantially parallel to the extending direction of the arm portion 54 and extends substantially parallel to the direction opposite to the arm portion 54. It is provided.

  On the other hand, the first hooks 52 engage with the first inner diameter guides 64 a and 64 b and the second inner diameter guide 66 which stand on the throttle plate 18 in the axial direction of the shaft 14 and restrict the radial movement of the spring 38. And a locking portion 72 for restricting relative rotation with respect to the shaft 14.

  The locking portion 72 includes a falling-off preventing piece 74 having a first height H1 orthogonal to the axis D3 of the shaft 14 when viewed from the axial direction of the arm portion 54, and the throttle plate 74 with respect to the falling-off preventing piece 74. A connecting piece 76 formed on the 18th side (in the direction of arrow A) and having a second height H2 smaller than the first height H1; the first height H1 is The second height H2 is set to be larger than the shortest distance L1 with the extension hook portion 58, and the second height H2 is set to be smaller than the shortest distance L1.

  Accordingly, the spring 38 for urging the shaft 14 to apply a rotational force is inserted through the shaft 14, and the second hook 52 is engaged with the connecting piece 76 having a small height dimension with respect to the falling-off preventing piece 74. In this state, the spring 38 is compressed in the axial direction and the movement in the radial direction is regulated by the first inner diameter guides 64a and 64b and the second inner diameter guide 66. Has been assembled.

  As a result, the intake control device 10 can be engaged with the throttle body 12 and the throttle plate 18 and assembled without reducing the assemblability of the spring 38, and the second hook 52 can be connected to the connecting piece 76. By engaging the second hook 52 with the second hook 52, the second hook 52 can be securely prevented from falling off.

  Further, the second hook 52 is provided on the connecting piece 76 so that the second hook 52 can be prevented from falling off from a locking edge 78 which is an end of the connecting piece 76 in a direction orthogonal to the axis D3 of the shaft 14. A connecting edge 82 extending to a falling-off prevention edge 80, which is an edge in a direction perpendicular to the axis D3, having a radius R equal to the shortest distance L1 between the arm 54 and the extension hook 58; An imaginary circle F centered on the connection edge 82 is formed so as to intersect with the drop-off preventing piece 74.

  As a result, even when a force in the torsional direction about the axis D2 of the arm portion 54 is applied to the second hook 52 due to the force applied to the spring 38, the extension hook portion 58 is prevented from falling off. The second hook 52 is securely held by the locking portion 72 without falling over the second hook 74, thereby preventing the second hook 52 from falling off.

  Further, as viewed from the axial direction of the shaft 14 shown in FIG. 3B, the shaft 14 is disposed in a first region T1 which is divided by the axis D2 of the arm portion 54 of the spring 38 and is located above and is located below the axis D2. When the second hook 52 of the spring 38 is arranged in the second area T2, and a plane that passes through the axis D3 (center of the axis) of the shaft 14 and is parallel to the axis D2 is the first reference plane S1, The amount of projection of the first inner diameter guides 64a and 64b disposed above the first reference surface S1 along the axial direction is set to be smaller than twice the diameter of the wire 42 of the spring 38. .

  Furthermore, when a surface passing through the axis D3 of the shaft 14 perpendicular to the axis D2 of the arm portion 54 of the spring 38 when viewed from the axial direction of the shaft 14 shown in FIG. In one area T1, the distance from the end winding intersection point P1 where the second reference surface S2 intersects the inner peripheral surface of the first end winding portion 46 of the spring 38 to the hook end 84 which is the tip of the extension hook portion 58 is defined as the hook distance. L2, the distance from the shaft intersection P2 where the second reference plane S2 intersects the outer peripheral surface of the shaft 14 in the first area T1 to the point P3 farthest from the shaft intersection P2 in the connection piece 76 in the first area T1 When L3, the locking distance L3 is smaller than the hook distance L2.

  Thus, when the second hook 52 is engaged with the locking portion 72 of the throttle plate 18 with the spring 38 inserted through the shaft 14, as shown in FIG. By moving the hook end portion 84 of the extension hook portion 58 to the connecting piece 76 easily and surely by moving the hook end portion 84 to the locking portion 72 side to a position where it contacts the outer peripheral surface of the connecting portion 76.

  As a result, in the intake control device 10, the assemblability of the spring 38 with respect to the throttle plate 18 can be improved, and at the same time, the second hook 52 can be easily prevented from falling off from the locking portion 72 of the throttle plate 18.

  Note that the fluid valve structure used in the intake control device according to the present invention is not limited to the above-described embodiment, but may adopt various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Intake control device 12 ... Throttle body 14 ... Shaft 16 ... Valve 18 ... Throttle plate 20 ... Intake passage 34 ... Cylindrical part 38 ... Spring 50 ... First hook 52 ... Second hook 54 ... Arm part 56 ... Hook part 58 ... Extension hook portions 64a, 64b First inner diameter guide 66 Second inner diameter guide 72 Locking portion 74 Fall-off prevention piece 76 Connection piece H1 First height H2 Second height S1 First reference surface S2 ... Second reference plane T1. First area T2.

Claims (3)

A valve body having a passage through which a fluid passes, a valve body that adjusts the flow rate of the fluid by adjusting a cross-sectional area of the passage, and a valve body rotatably supported by the valve body and fixed to the valve body. A valve shaft, and a spring that is engaged with both the valve body and the valve shaft and urges the valve shaft to rotate.
The valve body includes a support portion rotatably supporting the valve shaft, and a cylindrical portion formed outside the support portion and provided substantially coaxially with a rotation axis that is a rotation center of the valve shaft.
On the valve shaft, a rotating plate provided so as to extend in a direction substantially orthogonal to the rotation axis and restricting movement of the spring in the direction of the rotation axis is fixed.
The spring is a torsion spring having a winding portion around which a strand is wound a plurality of times around a reference axis, and is compressed in the direction of the reference axis between the rotary plate and the valve body. In the state, at least a part of the winding portion is arranged on the outer peripheral side of the cylindrical portion,
In the fluid valve structure, wherein the rotating plate includes an inner diameter guide that rises in a direction of the rotation axis, and the inner diameter guide restricts movement of at least a part of the winding part toward the rotation axis.
At the end of the spring, which is in the direction of the reference axis and on the side of the rotary plate, an end winding portion formed by bending the element wire into a substantially circular shape, and an arm portion extending in a tangential direction of the end winding portion And a hook portion bent and extended with respect to the arm portion, and further bent with respect to the hook portion and substantially parallel to an extending direction of the arm portion, and a direction in which the arm portion extends. Has an extension hook portion extending in the opposite direction,
The rotary plate includes a rotation locking portion that engages with the hook portion and regulates relative rotation of the hook portion and the valve shaft around the rotation axis.
The rotation locking portion includes a fall-off prevention piece having a first height in a direction perpendicular to the direction of the rotation axis when viewed from a direction of an arm axis that is a center axis of the arm portion, and a fall-off prevention piece. A locking piece disposed on the rotating plate side and having a second height smaller than the first height,
A fluid valve for use in an intake control device, wherein the first height is set to be greater than a shortest distance between the arm and the extension hook, and the second height is set to be smaller than the shortest distance. Construction. The fluid valve structure according to claim 1,
The rotation locking portion is, when viewed from the direction of the arm axis, a direction perpendicular to the rotation axis of the falling-off preventing piece from a locking edge that is an edge of the locking piece in a direction perpendicular to the rotation axis. It has a connection edge that continues to the fall prevention edge that is the edge of
When viewed from the direction of the arm axis, an imaginary circle having a radius equal to the shortest distance between the arm portion and the extension hook portion with the connection edge portion as a base point is formed so as to intersect the falling-off preventing piece. Fluid valve structure used in an intake control device. The fluid valve structure according to claim 1 or 2,
Seen from the direction of the rotation axis, the valve stem is arranged in a first region divided by the arm axis and provided in a first direction orthogonal to the arm axis, The hook portion is disposed in a second region provided in a second direction which is the opposite direction,
When a plane passing through the center of the valve shaft and parallel to the arm axis is defined as a first reference plane when viewed from the direction of the rotation axis, the inner diameter disposed in the first direction with respect to the first reference plane. The amount of protrusion of the guide in the axial direction of the valve shaft is set to be smaller than twice the wire diameter of the strand,
Assuming that a plane orthogonal to the arm axis and passing through the axis of the valve shaft is a second reference plane when viewed from the direction of the rotation axis, the second reference plane is the first reference plane when viewed from the direction of the rotation axis. In the area, a distance from an end winding intersection point intersecting with the end winding part to a hook end which is a tip along the extending direction of the extension hook part is defined as a hook distance, and the second reference plane is the first area in the first area. When the distance from the axis intersection that intersects with the outer peripheral surface of the valve shaft to the farthest point from the axis intersection in the locking piece is the locking distance, the locking distance is smaller than the hook distance. Fluid valve structure used for

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