WO2007145311A1

WO2007145311A1 - Valve device and device for controlling idle air amount

Info

Publication number: WO2007145311A1
Application number: PCT/JP2007/062094
Authority: WO
Inventors: Yoshihiro Fujita; Osamu Miura; Satoshi Ando
Original assignee: Mikuni Corporation
Priority date: 2006-06-16
Filing date: 2007-06-15
Publication date: 2007-12-21
Also published as: JP2007332904A

Abstract

A valve device that has a simple structure, is small in size, low in cost, and light in weight, and can reliably perform opening and closing operation. The valve device has a valve body (20) having a predetermined outer peripheral surface (22a) and a female screw thread (25c') in the direction of the axis (L) of the valve body; a rotation member (32) having a male screw thread (32a) screwed to the female screw thread (25c') of the valve body (20), and a drive source (30) for driving the rotation member (32). A path (13) is opened and closed by the outer peripheral surface (22a) of the valve body (20). The valve body (20) further has a circular tube-shaped valve member (21) having the outer peripheral surface (22a) and a screw member (25) connected to the valve member (21) so as to be movable by a predetermined amount relative to the valve member in the direction of the axis (L). The valve body (20) can reliably perform opening and closing operation without being locked by biting or sticking. Also, highly accurate dimension management is not required, and this reduces production costs and facilitates forming of the valve body from resin.

Description

Specification

Valve device and idle air amount control device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a valve device that opens and closes a passage through which a fluid passes, and an engine idle air amount control device using the valve device.

Background art

[0002] As an idle air amount control device equipped with a conventional valve device, an air inflow hole through which air guided from an intake passage on the upstream side of the throttle valve passes, and an axial direction perpendicular to the axial direction of the air inflow hole A cylindrical control hole member that defines an axial line and air inflow hole force and stores two control holes on its side surface, and the air that flows out from the control hole of the control hole member more than the throttle valve A passage member that leads to the intake passage on the downstream side and a control hole member are provided with a valve device that is reciprocally moved in the axial direction thereof to open and close the control hole, and throttles disposed in the respective intake passages when idling. It is known to bypass the valve and guide air from the upstream side to the downstream side of the intake passage (see, for example, Patent Document 1).

[0003] Here, the valve device is a valve that is formed integrally on the inner side of the outer cylindrical portion and the outer cylindrical portion that slide on the inner peripheral surface of the control hole member and coaxially, and has an inner cylindrical force. Body, a lead screw with a male screw that engages with the female thread of the valve body (inner cylindrical part), a stepping motor that rotates the lead screw, and a coil spring that urges the valve body in the axial direction.

Then, by starting the stepping motor and rotating the lead screw, the valve body is reciprocated to open and close the control hole.

[0004] However, in this valve device, when the valve element moves to the moving end in the axial direction and the end surface of the outer cylindrical portion is seated, the female screw is excessively pressed against the male screw by the reaction force. There is a risk that the screw may become squeezed and the valve body may lock and become inoperable.

Further, the outer cylindrical portion and the inner cylindrical portion are formed in an integral double cylindrical shape having the same axis (concentric), and the outer cylindrical portion slides on the inner peripheral surface of the control hole member to control hole. Open and close Therefore, if the axial centers of the outer cylindrical surface of the outer cylindrical portion, the inner peripheral surface of the control hole member, the female screw of the inner cylindrical portion, and the lead screw are not aligned with high accuracy, the sliding surface will be There is a risk that it may become inoperable due to a phenomenon such as sticking. Therefore, in order to avoid this, it is necessary to manage the coaxiality with high accuracy, which causes an increase in cost.

Furthermore, when a load or the like is applied to the valve body from the outside, stress is generated at the threaded portion of the female screw and the male screw, and the valve body may become inoperable as well.

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-37916

Disclosure of the invention

Problems to be solved by the invention

[0006] The present invention has been made in view of the circumstances of the above-described conventional apparatus. The purpose of the present invention is to achieve high-precision management of manufacturing dimensions and the like while reducing costs and downsizing. An object of the present invention is to provide a valve device that can prevent unnecessary load or stress from being applied, reliably guarantee the opening / closing operation of the valve body, and has excellent durability, and an idle air amount control device using the valve device. Means to solve

[0007] A valve device according to the present invention includes a valve body that defines one of a female screw and a male screw in a predetermined outer peripheral surface and an axial direction thereof, a female screw that is screwed into one of the female screw and the male screw of the valve body, and A valve device that includes a rotating member that defines the other of the male threads and a drive source that drives the rotating member, and that opens and closes the passage by the outer peripheral surface of the valve body, the valve body being a cylinder that defines the outer peripheral surface And a screw member that is movably connected by a predetermined amount relative to the valve member in the axial direction and defines one of a female screw and a male screw.

According to this configuration, when the rotary member is rotationally driven by the drive source, the screw member moves in the axial direction by the feed screw mechanism by screwing of the male screw and the female screw, and the valve member moves in conjunction with the screw member. Moving. Here, the screw member and the valve member are formed as separate members and are connected so as to be interlocked with a certain amount of play! Therefore, there is a load (load) received on one side, stress etc. on the other side In addition, since the mutual coaxiality is not required so much, the screw member can be reliably screwed with the rotating member, and the valve member reliably opens and closes the passage. be able to. As a result, the valve body can be reliably opened and closed without being locked due to stagnation or biting. In addition, since it is not necessary to manage the dimensional accuracy with high accuracy, the manufacturing cost can be reduced, and the valve body can be easily greased.

[0008] In the valve device configured as described above, the valve member has a cylindrical portion that defines an outer peripheral surface, a bottom portion that defines an opening opened in the axial direction, and a screw member is inserted into the opening from the inside of the valve member. A configuration may be employed having a threaded portion that is threaded through and engaged with the outer end face of the bottom portion, the thread portion defining the other of the female screw and the male screw.

According to this configuration, the screw member is arranged in the state where the screw portion is disposed in the cylindrical portion by engaging the flange portion of the screw member with the outer end surface of the bottom portion through the opening provided in the bottom portion of the valve member. Can be connected to the valve member and can be easily assembled.

[0009] In the valve device having the above-described configuration, the bottom of the valve member employs a configuration in which a recess for receiving a predetermined amount in the axial direction is defined on the outer end surface of the valve member. be able to.

According to this configuration, in a state where the screw member is coupled to the valve member, the amount of protrusion in the axial direction can be reduced by fitting the collar portion into the concave portion of the bottom portion, and the valve body can be reduced in size. it can. Also, by matching the shape of the recess to the shape of the collar, relative rotation of both around the axis can be prevented.

[0010] In the valve device having the above-described configuration, the bottom of the valve member may employ a configuration in which a protruding piece that guides the flange that moves in the axial direction is defined on the outer end surface thereof.

According to this configuration, when the screw member moves relative to the valve member in the protruding direction, the flange portion is guided by the protruding piece, so that the screw member and the valve member are not in the axial direction. The positional relationship is maintained. In addition, when the fluid flows so as to oppose (collision) from the axial direction to the bottom, this projecting piece stirs the flow of the fluid and mixes the flow, the flow and the flow, thereby preventing the separation of the flow. The pressure resistance can be reduced.

[0011] In the valve device configured as described above, a configuration including a spring that biases the valve member in one direction with respect to the rotating member can be employed. According to this configuration, the screw member can be brought into contact with the valve member by the biasing force of the spring to prevent rattling, and backlash between the female screw and the male screw can be prevented in the screwed relationship between the screw member and the rotating member. It can be removed and there is an impact! /, There is no rattling noise, etc., and a smooth screw feeding action can be obtained.

[0012] In the valve device configured as described above, the screw member has an enlarged diameter portion at a position spaced apart from the bottom by a predetermined amount in the axial direction inside the valve member. A configuration in which an elastically deformable buffer member is interposed between the diameter portions can be employed.

According to this configuration, when a buffer member (for example, an o-ring or a spring) is interposed between the bottom portion and the enlarged diameter portion, the valve member moves in the axial direction and the end surface thereof is seated. It is possible to prevent the shock absorbing member from absorbing the impact force and transmitting it to the screw member. If an o-ring is used as the buffer member, the connection region between the valve member and the screw member can be sealed.

[0013] In the valve device having the above-described configuration, it is possible to adopt a configuration in which a female screw is formed on the screw portion of the valve member and a male screw is formed on the rotating member.

According to this configuration, by forming the female screw on the valve body and the male screw on the rotating member, the valve body and the rotating member can be formed compactly, and as a result, the valve device can be downsized.

[0014] The idle air amount control device of the present invention has a plurality of communication passages on its inner peripheral surface so as to connect the suction passage for sucking air, the plurality of discharge passages for discharging air, and the suction passage and the plurality of discharge passages. A housing that defines a communication passage having a port, a valve body that defines one of a female screw and a male screw in an axial direction of the outer peripheral surface that opens and closes the communication port, and a female screw and a male screw of the valve member. An idle air amount that controls the amount of air that flows by bypassing the throttle valve in the engine intake system, including a female member to be screwed and a rotating member that defines the other of the male screw and a drive source that drives the rotating member The valve body includes a cylindrical valve member that defines an outer peripheral surface, and a valve member that is movably connected to the valve member by a predetermined amount in the axial direction, and is one of a female screw and a male screw. A screw member defining a configuration, and There is.

According to this configuration, the intake pipe and the throttle valve communicated with each cylinder of the multi-cylinder engine. In the intake system formed by a single surge tank (or air cleaner, outside air introduction duct) that connects each intake pipe and the intake pipe, the intake passage, communication passage, and discharge passage of this device should bypass the throttle valve. In addition, a common surge tank force air upstream of each throttle valve is introduced and led to each intake pipe downstream of each throttle valve. During idling, the valve element opens, and the air guided to the suction passage flows into the discharge passage from the communication passage, and is then guided to each intake pipe. In such an air passage, when the rotary member is driven to rotate by the drive source, the screw member moves in the axial direction by a feed screw mechanism by screwing of the male screw and the female screw, and the valve is interlocked with the screw member. The member moves in the communication path to open and close the communication port.

Here, since the screw member and the valve member are formed as separate members and are connected so as to be linked with a certain amount of play, the load (load) or stress received by one is transmitted to the other. In addition, since the mutual coaxiality is not so required, the screw member can be reliably screwed with the rotating member, and the valve member can reliably open and close the passage. As a result, the valve body can be reliably opened and closed without causing locking and biting or the like to lock. In addition, since it is not necessary to manage the dimensional accuracy with high accuracy, the manufacturing cost can be reduced, and the valve body can be easily oiled.

In the idle air amount control device having the above-described configuration, the valve member has a cylindrical portion that defines an outer peripheral surface, a bottom portion that defines an opening opened in the axial direction, and the screw member is a valve member. It is possible to adopt a configuration having a threaded portion that is inserted into the opening from the inside and engaged with the outer end surface of the bottom portion, and that defines the other of the female screw and the male screw.

According to this configuration, the threaded portion of the screw member is provided in the bottom portion of the valve member or is passed through the opening and engaged with the outer end surface of the bottom portion. It can be connected to the member and can be assembled easily.

[0016] In the idle air amount control device configured as described above, a configuration is adopted in which the bottom portion of the valve member defines a recess that receives a predetermined amount of the flange portion in the axial direction on the outer end surface thereof. be able to.

According to this configuration, in a state where the screw member is connected to the valve member, the amount of protrusion in the axial direction can be reduced by fitting the collar portion into the concave portion of the bottom portion, and the valve body can be reduced. It can be downsized. Also, by matching the shape of the recess to the shape of the collar, relative rotation of both around the axis can be prevented.

[0017] In the idle air amount control device having the above-described configuration, the bottom portion of the valve member adopts a configuration in which a protruding piece that guides the flange portion moving in the axial direction is defined on the outer end surface thereof. can do.

[0018] In the idle air amount control device configured as described above, a configuration including a spring that urges the valve member in the negative direction with respect to the rotating member can be employed.

According to this configuration, the screw member can be brought into contact with the valve member by the biasing force of the spring to prevent rattling, and backlash between the female screw and the male screw can be prevented in the screwed relationship between the screw member and the rotating member. It can be removed and there is an impact! /, There is no rattling noise, etc., and a smooth screw feeding action can be obtained.

In the idle air amount control device having the above-described configuration, the screw member has an enlarged diameter portion at a position spaced apart from the bottom in the axial direction on the inner side of the valve member, and expands from the bottom. A configuration in which an elastically deformable buffer member is interposed between the diameter portions can be adopted.

[0020] In the idle air amount control device having the above-described configuration, it is possible to employ a configuration in which a female screw is formed on the screw portion of the valve member and a male screw is formed on the rotating member. it can According to this configuration, by forming the female screw on the valve body and the male screw on the rotating member, the valve body and the rotating member can be formed compactly, and as a result, the idle air amount control device can be downsized. it can.

The invention's effect

[0021] According to the valve device and the idle air amount control device configured as described above, high-precision management such as manufacturing dimensions is unnecessary and a load or stress is applied while achieving cost reduction and downsizing. Therefore, it is possible to reliably guarantee the opening / closing operation of the valve body, and to obtain a valve device excellent in durability and an idle air amount control device using the valve device.

Brief Description of Drawings

FIG. 1 is a system diagram showing an embodiment in which an idle air amount control device including a valve device according to the present invention is applied to a four-cylinder engine.

FIG. 2 is an external perspective view showing an embodiment of an idle air amount control device including a valve device according to the present invention.

3 is a longitudinal sectional view of the idle air amount control device shown in FIG.

4 is a cross-sectional view of the idle air amount control device shown in FIG.

FIG. 5 shows a valve body incorporated in the idle air amount control device shown in FIG.

) Is a longitudinal sectional view, and (b) is an end view thereof.

[Fig. 6] This shows a valve member that forms part of the valve body. (A) is a side view, (b) is an end view, and (c) is a longitudinal section at El-E1 in (a). FIG.

[Fig. 7] A screw member forming a part of the valve body, (a) is a plan view thereof, (b) is a side view thereof, (c) is an end view thereof, and (d) is (b) 2 is a longitudinal sectional view taken along line E2-E2.

Explanation of symbols

[0023] L axis

10 Housing

11 Suction passage

11a Mating passage

l ib Reduced diameter passage

l ib 'Stepped part (seat surface) Discharge passage

Communication path

a Communication port

Disc

Valve member (valve element)

Cylindrical part

a Outer surface

bottom

a Annular end face

b Opening

c Recess

d Protruding piece

Screw member (valve)

a buttock

b neck

c Screw part

c 'female thread

c "width across flats

d Expanded part

O-ring (buffer member, valve body) Stepping motor (drive source) Case

Rotor screw part (rotating member) a Male thread

Guide section

cover

a Connector

coil spring 40 Suction side connector pipe

50 Discharge side connector pipe

60 Retaining member

BEST MODE FOR CARRYING OUT THE INVENTION

FIGS. 1 to 7 show an embodiment of an idle air amount control device M provided with a valve device according to the present invention. FIG. 1 shows this device M as an intake system of a four-cylinder engine. Fig. 2 is an external perspective view of the device M, Fig. 3 is a longitudinal sectional view of the device M, Fig. 4 is a cross-sectional view of the device M (with the valve element omitted), and Fig. 5 is included in the device M. 6 is a side view, an end view, and a longitudinal sectional view of a valve member that forms a part of the valve body, and FIG. 7 is a plan view of a screw member that forms a part of the valve body. It is a figure, a side view, an end view, and a longitudinal sectional view.

[0025] As shown in Fig. 1, the intake system of the engine E includes four intake pipes 1 communicating with each cylinder, and one surge tank (or air cleaner) 2 connecting the upstream ends of the four intake pipes 1. , An outside air introduction duct 3 connected to the upstream side of the surge tank 2, a throttle valve 4 that can be opened and closed in each intake pipe 1, and a throttle shaft 5 that supports four throttle valves 4 that can be opened and closed coaxially , Actuator 6 that drives the throttle shaft 5, Idle air amount control device M suction side connector pipe (suction passage) 40 and one pipe that connects the surge tank 2 7, Idle air amount control device M 4 discharge side connectors It has four pipes 8 etc. that connect the pipe (discharge passage) 50 and each intake pipe 1 downstream of the throttle valve 4.

As shown in FIGS. 2 to 4, the idle air amount control device M includes an intake passage 11 for sucking air, four discharge passages 12 for discharging air, an intake passage 11 and four discharge passages 12. A housing 10 that defines a communication path 13 and the like that communicates, a valve body 20 that can be reciprocated in a housing 10 to open and close the communication path 13, a stepping motor 30 as a drive source that drives the valve body 20, and a suction The suction side connector pipe 40 fitted in the passage 11, the four discharge side connector pipes 50 fitted in the discharge passage 12, the two retaining members 60 that regulate the withdrawal of the discharge side connector noise 50, etc. RU

[0027] The housing 10 is formed of an aluminum material or a resin material, and as shown in FIGS. 2 to 4, the suction passage 11, the four discharge passages 12, and the communication passage formed coaxially with the suction passage 11. The passage 13, the recess 14 formed coaxially adjacent to the communication passage 13 and having an enlarged diameter, the two screw holes 15 for fastening the retaining member 60 with the screw B, and the cover 35 of the stepping motor 30 to be described later are screwed. It has a flange 16 with two screw holes 16a for fastening at B, a mounting flange 17 with a through hole 17a, a reinforcing rib 18 and the like.

As shown in FIGS. 3 and 4, the suction passage 11 has a fitting passage 11a into which the suction-side connector pipe 40 is fitted, and a reduced diameter passage l ib formed with a smaller diameter than the fitting passage 11a. It is formed by. The step portion l lb that defines the reduced diameter passage l ib also serves as a seat surface on which a valve member 21 of the valve body 20 described later is seated.

As shown in FIG. 3 and FIG. 4, the communication passage 13 is formed in a cylindrical shape with the same axis as the reduced-diameter passage 12b of the suction passage 12 and with an enlarged diameter. And four communication ports 13a formed so as to communicate with the respective discharge passages 12 by being radially opened in a plane perpendicular to the vertical axis. The communication passage 13 guides the cylindrical valve body 20 by slidingly fitting it in the direction of the axis L so as to open and close the communication port 13a formed on the inner peripheral surface thereof. RU

That is, the air sucked into the suction passage 11 is guided from the communication passage 13 through the communication port 13a to the four discharge passages 12, and the valve body 20 opens or closes or opens the communication port 13a. The amount of air flowing from the suction passage 11 to the discharge passage 12 is controlled by adjusting the amount.

The recess 14 accommodates the stepping motor 30 and is formed so as to position the stepping motor 30 at a predetermined position in the axis L direction.

[0029] As shown in Figs. 3 and 5, the valve body 20 includes a cylindrical valve member 21 and a screw member 25 which is disposed inside the valve member 21 and connected with a gap in the axis L direction. In addition, an O-ring 28 or the like as a buffer member incorporated so as to be interposed between the valve member 21 and the screw member 25 is provided.

As shown in FIGS. 3 and 5, the valve member 21 includes a cylindrical portion 22 that defines a cylindrical outer peripheral surface 22a, a bottom portion 23 formed integrally with the lower end of the cylindrical portion 22, and the like. Yes.

As shown in FIG. 3, the outer peripheral surface 22a of the cylindrical portion 22 slides on the inner peripheral surface of the communication path 13 to open and close the communication port 13a. As shown in FIG. 6, the bottom portion 23 defines an annular end surface 23a, an opening 23b, two concave portions 23c, and two projecting pieces 23d on the outer end surface thereof.

As shown in FIGS. 3 and 5, the annular end surface 23 a is seated on the step portion 11 that defines the reduced diameter passage l ib of the suction passage 11.

As shown in FIG. 6 (c), the opening 23b is opened so as to penetrate the bottom 23 in the direction of the axis L so as to have a shape in which a circle is superimposed on the center of a substantially rectangular shape.

As shown in FIG. 6 (b), the recess 23c is formed so as to sandwich the opening 23b in the Y direction perpendicular to the longitudinal direction X of the opening 23b, and is formed so as to receive a flange portion 25a of the screw member 25 described later. Has been.

The two protruding pieces 23d are formed so that the outer end surface force of the bottom 23 protrudes outward (downward in the direction of the axis L in FIG. 6) by a predetermined amount, and a flange 25a described later is formed in the direction of the axis L. Come to guide! /

As shown in FIGS. 5 and 7, the screw member 25 includes a flange portion 25a positioned outside the valve member 22, a neck portion 25b positioned at the opening 23b of the valve member 21, and a screw portion positioned inside the valve member 21. 25c, and an enlarged diameter portion 25d formed so as to protrude in the radial direction above the neck portion 22b.

As shown in FIG. 5 and FIG. 6, the flange portion 25a is passed through the opening 23b of the valve portion 21 and rotated approximately 90 degrees to be received by the recess 23c in a predetermined amount in the direction of the axis L (ie, That is, it is formed to engage with the outer end surface of the bottom 23.

As shown in FIG. 5 (a), the neck portion 25b is formed in such a size that a gap is formed between the neck portion 25b and the opening 23b while being passed through the opening 23b.

As shown in FIG. 7, the screw portion 25c is formed so as to demarcate the female screw 25 in the axis L direction and the two-surface width portions 25c˜ on the outer peripheral surface thereof. Then, the screw portion 25c is inserted into a guide portion 34 of the stepping motor 30 described later, and is guided so as to be movable in the direction of the axis L while its rotation is restricted!

As shown in FIG. 5 and FIG. 7, the enlarged diameter portion 25d has a conical shape at a position separated from the bottom 23 (the inner surface) in the axis L direction by a predetermined amount with the screw member 25 connected to the valve member 21. It is formed in a trapezoidal shape. The enlarged diameter portion 25d cooperates with the bottom portion 23 to It is getting stuck.

[0032] Assembling of the valve body 20 having the above-described configuration is performed by inserting the flange 25a of the screw member 25 into the opening 23b from the inside of the valve member 21 with the O-ring 28 fitted into the neck 25b of the screw member 25. The ring 28 is inserted while being compressed, and then the screw member 25 is rotated approximately 90 degrees so that the flange 25a enters the recess 23c, that is, engages with the outer end surface of the bottom 23.

As a result, as shown in FIG. 5, the screw member 25 is not separated from the valve member 21 and is a predetermined amount in the direction of the axis L (within a range in which the O-ring 28 can be compressed and deformed). Movably connected. In this way, the valve member 21 and the screw member 25 can be easily assembled, and there is a certain amount of play by combining the other members including the valve member 21, the screw member 25, and the O-ring 28. Formed to work together!

Therefore, when the screw member 25 receives an impact force (or pressing force) downward in FIG. 5 (a) in the direction of the axis L, the O-ring 28 has an impact force (or pressing force). ) So that the flange 25a can be slightly separated from the bottom 23 of the valve member 21 along the protruding piece 23d. Thereby, it is possible to prevent unnecessary impact force from being transmitted to the valve member 21, and the valve member 21 can reliably open and close the communication port 13a.

When the valve member 21 is seated on the step portion l lb of the housing 10 and receives an upward impact force (or pressing force) in FIG. 5A in the axis L direction, the O-ring 28 By elastically deforming so as to absorb (or pressing force), the flange 25a can be slightly separated from the bottom 23 of the valve member 21 along the protruding piece 23d. Thereby, unnecessary impact force and the like can be prevented from being transmitted to the screw member 25, and the screw member 25 can normally maintain the screwing relationship with the rotor screw portion 32 described later.

As described above, the load (load) or stress received by one of the valve member 21 and the screw member 25 is not transmitted to the other, and the mutual coaxiality is not required so much, so the screw member 25 will be described later. The rotor member 32 can be reliably screwed together, and the valve member 21 can reliably open and close the communication path 13 (communication port 13a).

As a result, the valve body 20 can reliably perform the opening / closing operation of the communication port 13a without being locked due to stagnation or biting. In addition, since it is not necessary to manage the dimensional accuracy with high accuracy, the manufacturing cost can be reduced, and the valve body 20 can be easily reduced in size. I can.

[0035] Here, the amount of protrusion in the axis L direction is reduced by providing the bottom 23 (outer end surface) of the valve member 21 with the recess 23c that receives the flange 25a by a predetermined amount in the axis L direction. Therefore, the valve body 20 can be reduced in size, and the relative rotation of the two around the axis L can be prevented.

In addition, at the bottom 23 of the valve member 21, by providing a protruding piece 23d that guides the flange 25a that moves in the axis L direction, the screw member 25 moves relative to the valve member 21 in a protruding direction. At this time, since the flange 25a is guided by the protruding piece 23d, the relative positional relationship between the screw member 25 and the valve member 21 other than the direction of the axis L (around the axis L) is maintained.

Further, when the projecting piece 23d is provided, when the fluid flows so that the axial force also opposes (impacts) the bottom 23, the projecting piece 23d stirs the flow of the fluid and slows the flow. By mixing, flow separation can be prevented and the flow pressure resistance can be reduced.

[0036] It should be noted that here, a force using only the O-ring 28 as a buffer member is used, and if a size that completely closes the opening 23b is used, a sealing device that can be used as a seal member and blocks the opening 23b is obtained. Chisaru

As shown in FIG. 3, the stepping motor 30 includes a case 31, a rotor (not shown) that is rotatably supported around the axis L in the case 31, and around the rotor in the direction of the axis L. Two stacked stators (not shown), a guide part 34 for guiding the threaded part 22 of the valve body 20 in the direction of the axis L, a cover 35 which is joined to the housing 10 and defines an electrical connection connector 35a, a guide part A coil spring 36 or the like fitted in a compressed state is provided between the valve portion 34 and the valve portion 21.

[0038] The rotor is integrally provided with a cylindrical magnetized portion magnetized in multiple poles on the outer peripheral surface thereof and a rotor screw portion 32 as a rotating member formed with a male screw 32a.

The rotor screw portion 32 has a male screw 32a screwed into a female screw 25 of the valve body 20 (screw member 25). When the rotor (the magnetized portion and the rotor screw portion 32) rotates, the valve body 20 moves in the direction of the axis L.

Each of the two stators has an exciting coil, a bobbin for winding the coil, It is formed by a yoke consisting of a pair of components that are held and joined.

The guide portion 34 has a substantially frustoconical appearance, and is formed so that the screw member 25 (screw portion 25c) of the valve body 20 is slidably received therein. It is designed to reciprocate in the axis L direction while restricting rotation.

The cover 35 covers a substantially half of the case 31 and defines a connection connector 35 a for energizing the coil. The cover 35 is fastened to the flange 16 of the housing 10 with screws B.

[0039] The coil spring 36 is in contact with the root region of the guide portion 34 and the valve member 21 (the bottom 23), and attaches the valve member ₂₁ in one direction (downward in FIG. 3) with respect to the rotor screw portion ₃₂ . It is assembled in a compressed state so as to exert a predetermined biasing force.

As a result, the coil spring 36 prevents backlash between the female screw 25 of the screw member 25 and the male screw 32a of the rotor screw portion 32 as well as preventing backlash between the valve member 21 and the screw portion 22. /!

[0040] The operation of the idle air amount control device having the above configuration will be described. When the engine E is in an idling state, the stepping motor 30 is driven, and the valve body 20 (valve member 21) opens the communication port 13a. To do. That is, due to the feed screw action of the rotor screw portion 32 and the screw member 25 of the rotor, the screw member 25 starts to move upward in the direction of the axis L in FIG. 3, and interlocks with the screw member 25 (substantially simultaneously with the screw member 25). ) The valve member 21 starts to move upward, and its outer peripheral surface 22a opens the plurality of communication ports 13a. At this time, even if the axial centers of the screw member 25 and the valve member 21 are slightly shifted, the screwing relationship between the screw member 25 and the rotor screw portion 32 is maintained correctly, and the valve member 21 smoothly passes through the communication path 13. The valve can be opened by sliding.

[0041] The air guided from the surge tank 2 upstream of the throttle valve 4 via the pipe 7 to the suction passage 11 is directed to the end face of the valve body 20 sliding in the communication passage 13 in the direction of the axis L. Then, it collides and bends in a substantially vertical direction and is guided radially, and flows into the corresponding discharge passages 12 from the four communication holes 13a.

[0042] The air flowing into the four discharge passages 12 is supplied into the four intake pipes 1 located downstream of the throttle valve 4 via the pipes 8. This allows each In the cylinder, stable combustion with no variation is obtained, and the engine E can be idling stably.

On the other hand, when an operating state other than idling is entered, the stepping motor 30 is driven, and the valve body 20 (valve member 21) closes the communication port 13a. That is, due to the reverse feed screw action of the rotor screw portion 32 and the screw member 25 of the rotor, the screw member 25 starts to move downward in the axis L direction in FIG. At substantially the same time, the valve member 21 begins to move downward, and its outer peripheral surface 22a closes the plurality of communication ports 13a. At this time, even if the shaft centers of the screw member 25 and the valve member 21 are slightly shifted, the screwing relationship between the screw member 25 and the rotor screw portion 32 is maintained normally, and the valve member 21 smoothly passes through the communication path 13. The valve can be closed by sliding.

[0044] Here, even if the annular end surface 23a of the valve member 21 comes into contact with the stepped portion llb of the housing 10, the impact force is absorbed by the O-ring 28, and the screw member 25 and the rotor screw portion 32 are screwed. The relationship is maintained normally.

The valve body 20 is normally positioned at the stepping motor 30 because the annular end surface 23a comes into contact with the stepped portion 1 lb ′ (seat surface) after the valve member 21 closes the communication port 13a. Learning is performed, and the drive control is performed so that the valve body 20 stops before the step portion l lb comes into contact.

[0045] In the above embodiment, the valve body 20 is configured by the valve member 21, the screw member 25, and the O-ring 28. However, the valve member 21 and the screw member are not limited thereto. If the relative movement of 25 is limited to a predetermined amount, a configuration in which the O-ring 28 is omitted may be adopted.

In the above-described embodiment, the case where the O-ring 28 is employed as the buffer member has been described, but a coil spring or the like that is not limited thereto may be employed.

In the above embodiment, the valve device is applied to an engine idle air amount control device. However, the present invention is not limited to this, and other fluids may be used as long as it is necessary to open and close a passage. Some fluid control devices pass through! /, And may be applied to passage structures that require other piping elements.

Industrial applicability As described above, the valve device and the idle air amount control device of the present invention achieve cost reduction and downsizing, and do not require high-precision management such as manufacturing dimensions and are subject to load or stress. This can be applied to control the air volume of engines mounted on motorcycles, automobiles, etc., as well as open and close the passage through the fluid. It is also useful in other fields if necessary.

Claims

The scope of the claims

[1] A valve body defining one of a female screw and a male screw in a predetermined outer peripheral surface and its axial direction, and defining the other of the female screw and the male screw engaged with one of the female screw and the male screw of the valve body A valve device comprising: a rotating member; and a drive source for driving the rotating member, wherein the passage is opened and closed by an outer peripheral surface of the valve body,

The valve body is connected to a cylindrical valve member that defines the outer peripheral surface, and is movable relative to the valve member by a predetermined amount in the axial direction, and defines one of the female screw and the male screw. Including screw members

A valve device characterized by that.

[2] The valve member has a cylindrical portion that defines the outer peripheral surface, a bottom portion that defines an opening opened in the axial direction,

The screw member has a threaded portion that is inserted into the opening from the inside of the valve member and engages with an outer end surface of the bottom portion, and defines the other of the female screw and the male screw. The valve device according to claim 1.

[3] The bottom of the valve member defines a recess on the outer end face thereof for receiving the flange by a predetermined amount in the axial direction.

The valve device according to claim 2, wherein:

[4] The bottom portion of the valve member defines, on the outer end surface thereof, a protruding piece that guides the flange portion that moves in the axial direction.

The valve device according to claim 1 or 2, wherein

[5] including a spring that biases the valve member in one direction with respect to the rotating member;

The valve device according to claim 1 or 2, wherein

[6] The screw member has an enlarged diameter portion at a position spaced apart from the bottom portion in the axial direction inside the valve member,

The valve device according to claim 1 or 2, wherein an elastically deformable buffer member is interposed between the bottom portion and the enlarged diameter portion.

[7] A female thread is formed on the threaded portion of the valve member, The rotating member is formed with a male screw.

The valve device according to claim 1 or 2, wherein

[8] Define a suction passage for sucking air, a plurality of discharge passages for discharging air, and a communication passage having a plurality of communication ports on an inner peripheral surface thereof so as to communicate with the suction passage and the plurality of discharge passages. A housing, an outer peripheral surface that opens and closes the communication port, a valve body that defines one of a female screw and a male screw in an axial direction thereof, and a female screw and a male screw that are screwed into one of the female screw and the male screw of the valve body An idle air amount control device that controls the amount of air that flows through the throttle valve in the engine intake system, the rotating member that defines the other of the above, and a drive source that drives the rotating member.

An idle air amount control device characterized by that.

[9] The valve member has a cylindrical portion that defines the outer peripheral surface, and a bottom portion that defines an opening opened in the axial direction,

The screw member has a threaded portion that is inserted into the opening from the inside of the valve member and engages with an outer end surface of the bottom portion, and defines the other of the female screw and the male screw. The idle air amount control device according to claim 8.

[10] The bottom portion of the valve member defines a recess on the outer end face thereof for receiving the flange portion by a predetermined amount in the axial direction.

The idle air amount control device according to claim 9.

[11] The bottom of the valve member defines a protruding piece that guides the flange that moves in the axial direction on the outer end surface thereof.

The idle air amount control device according to claim 8 or 9, wherein

[12] including a spring that biases the valve member in one direction with respect to the rotating member;

The idle air amount control device according to claim 8 or 9, wherein

[13] The screw member has an enlarged diameter portion at a position spaced apart from the bottom portion in the axial direction inside the valve member, 10. The idle air amount control device according to claim 8, wherein an elastically deformable buffer member is interposed between the bottom portion and the diameter-expanded portion.

A female thread is formed on the threaded portion of the valve member,

The rotating member is formed with a male screw.

The idle air amount control device according to claim 8 or 9, wherein