JPH061775U - Idle speed control valve - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents carbon etc. in blow-by gas from adhering to the vent hole of the inner housing of the idle speed control valve and the valve element that opens and closes the vent hole, resulting in malfunction. . [Structure] The inner housing 21 has a vent hole 2 which is open in the circumferential direction with respect to the outflow hole 6B of the outer housing 3.
1A and 21A are provided, and short tubular rib-like projections 22 and 22 projecting into the annular passage 6C along the outer periphery of each vent hole 21A are provided around each vent hole 21A. The carbon E in the blow-by gas adheres to the outer peripheral surface of the inner housing 21 and the outside of each rib-like projection 22 and is removed.
Can be prevented from invading and adhering between the cylindrical valve body 10 and the inner housing 21 or into each vent hole 21A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an idle speed control valve that is preferably used for controlling an idle speed of an automobile engine or the like.

[0002]

[Prior art]

 2 and 3 show a conventional idle speed control valve.

In the figure, reference numeral 1 denotes a housing which constitutes a main body of an idle speed control valve. The housing 1 has a stepped cylindrical outer housing 3 to which a conduit 2 is connected to one end side (the left side in FIG. 2). And one end side is fitted and fixed in the outer housing 3 and the other end side is located at the other end side of the stepped tubular inner housing 4 protruding outside the outer housing 3, and the other end side of the inner housing 4. , And a resin mold portion 5 integrally molded with the inner housing 4 so as to surround an electromagnetic actuator 13 described later.

Here, a throttle valve (not shown) of an automobile engine is bypassed to the housing 1 via a conduit 2, and an upstream side of the throttle valve enters a cylinder (not shown) of the engine. A ventilation passage 6 is formed to allow the auxiliary air to flow in the direction of arrow A toward the arrow A. The ventilation passage 6 is formed in the outer housing 3 and communicates with the inlet 6A of the auxiliary air communicating with the conduit 2 and the cylinder side. An outlet 6B, an annular passage 6C located between the inflow port 6A and the outflow port 6B and formed between the outer housing 3 and the inner housing 4, and the annular passage 6C are connected to a cylindrical valve body 10 described later. In order to communicate with the inflow port 6A through the inner housing 4, the inner housing 4 is formed with ventilation holes 6D, 6D which are formed to face each other in the radial direction as shown in FIG.

Reference numeral 7 denotes a valve body rotation shaft rotatably provided in the inner housing 4 via bearings 8 and 9. One end of the valve body rotation shaft 7 has a tip end side of the ventilation path 6 A cylindrical valve body 10 that is open to the inflow port 6A and is closed on the base end side is integrally provided. The cylindrical valve body 10 has a pair of openings 10A and 10A in the radial direction as shown in FIG. Is formed in a substantially rectangular shape.

The tubular valve body 10 is rotated together with the valve body rotation shaft 7 in the directions of arrows B and C in FIG. 3, so that the space between the openings 10 A and the ventilation holes 6 D of the ventilation path 6 is increased. The flow passage area of the ventilation passage 6 is variably adjusted by changing the opening degree θ of. The other end of the valve body rotating shaft 7 projects outside the inner housing 4 and extends axially in the yoke 14 that constitutes an electromagnetic actuator 13 described later.

Reference numeral 11 denotes a cylindrical permanent magnet fitted to the other end side of the valve body rotating shaft 7 and fixed to the valve body rotating shaft 7 by a retaining ring 12 or the like. The valve body rotating shaft 7 is rotated by the action of the magnetic force generated from the cylindrical valve body 10 in the directions of arrows B and C in FIG. Change according to the change of.

Reference numeral 13 denotes an electromagnetic actuator which is located at the other axial end of the valve body rotating shaft 7 and is provided in the resin mold portion 5. The electromagnetic actuator 13 is provided with the permanent magnet 11 and the permanent magnet 11. A yoke 14 which is formed into a hollow annular shape by abutting two yoke halves 14A and 14B in the axial direction, and is inserted into the outer side of the permanent magnet 11 with a minute gap, and the inside of the yoke 14. It is roughly composed of a first electromagnetic coil 15 and a second electromagnetic coil 16 which are wound around. The electromagnetic actuator 13 is connected to a control unit (not shown) via a connector 17 formed on the outside of the resin mold portion 5 so that a control signal having a predetermined pulse duty is transmitted from the control unit. By being applied, the cylindrical valve body 10 is rotated in the directions of arrows B and C via the valve body rotation shaft 7.

The idle speed control valve according to the prior art has the above-described structure. For example, the idle speed control valve bypasses a throttle valve in an automobile engine, and the front and rear of the throttle valve are supplemented with auxiliary air. It is arranged so as to be connected via a passage.

Then, the control unit energizes the first electromagnetic coil 15 through the connector 17 to excite the electromagnetic coil 15 to generate a magnetic flux from the yoke 14 toward the permanent magnet 11, and A rotating torque is generated on the valve body rotating shaft 7 by the interaction of the magnetic fields of, for example, the cylindrical valve body 10 is rotated in the direction of the arrow B in FIG. 3, and each opening portion of the cylindrical valve body 10 is rotated. The opening degree θ between 10A and each ventilation hole 6D of the ventilation path 6 is adjusted. As a result, the flow passage area of the ventilation passage 6 is adjusted, so that the throttle valve is bypassed from the upstream side of the throttle valve of the engine, and the amount of auxiliary air flowing in the direction of arrow A through the conduit 2 is changed to the cylindrical valve. It can be controlled according to the opening degree θ of the body 10, and this auxiliary air amount is adjusted according to the operating state of the engine body to control the idle speed.

Next, when operating an air conditioner or the like which is an external load of the engine, a voltage of an energization amount corresponding to this load is applied to the second electromagnetic coil 16 to excite the electromagnetic coil 16 together with the electromagnetic coil 15. The rotation torque applied to the valve body rotation shaft 7 between the yoke 14 and the permanent magnet 11 is increased. As a result, the tubular valve body 10 is further rotated in the direction of arrow B in FIG. 3, and the auxiliary air amount is increased by increasing the opening degree θ, so that the idle speed of the engine becomes a load of the air conditioner or the like. It is variably controlled accordingly.

Thus, the idle speed control valve increases the amount of auxiliary air supplied to the cylinder of the engine when the engine load is increased by operating the air conditioner or the like when the engine is idle, thereby increasing the idle speed of the engine. The number is increased according to the load to prevent engine stall during idling.

[0013]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional idle speed control valve, the cylindrical valve body 10 provided on the valve body rotating shaft 7 is rotated by the electromagnetic actuator 13, and each opening 10A of the cylindrical valve body 10 and the inner side thereof are rotated. By adjusting the opening degree θ between each ventilation hole 6 D of the ventilation passage 6 provided in the housing 4, the flow passage area of the ventilation passage 6 is adjusted, and the amount of auxiliary air flowing through the conduit 2 is controlled. is doing.

However, since the vent hole 6D of the inner housing 4 and the outlet 6B of the outer housing 3 face each other as shown in FIG. 3, the intake valve (neither is shown) is opened from the combustion chamber of the engine. When the blow-by gas initially flows backward through the intake pipe into the outlet 6B in the direction of the arrow D shown by the alternate long and short dash line, carbon E contained in the blow-by gas is discharged into the vent hole 6D and the tubular valve body 10. It is easy to adhere to the openings 10A, etc., and the carbon E adhered reduces the opening area of the ventilation passage 6, and the carbon E gradually accumulates and adheres to the peripheral portion of the ventilation hole 6D, so that the tubular valve There is a problem that the sliding resistance when the body 10 rotates greatly increases.

Therefore, in the prior art, the adhesion of carbon E makes it impossible to adjust the flow passage area of the ventilation passage 6 in accordance with the opening degree θ of the tubular valve body 10, and the auxiliary air amount cannot be accurately controlled. Then, the tubular valve body 10 and the inner housing 4 are eventually fixed to each other, causing a malfunction of the tubular valve body 10 and making it impossible to control the idle speed of the engine.

The present invention has been made in view of the above-mentioned problems of the prior art. In the present invention, carbon or the like in blow-by gas adheres to a vent hole of an inner housing or a valve body that opens or closes the vent hole. In addition, it is possible to prevent the flow passage area of the ventilation passage from decreasing and the sliding resistance at the time of opening and closing the valve body to increase, so that the idle speed can be stably controlled for a long period of time. The purpose is to provide an idle speed control valve that has

[0017]

[Means for Solving the Problems]

 The feature of the configuration adopted by the present invention to solve the above-mentioned problems is that the ventilation hole of the inner housing is circumferentially separated from the outlet of the outer housing, and the outlet of the outer housing is surrounded by the ventilation hole. The rib-shaped projections that restrict the reverse flow of gas toward the inside of the ventilation hole are provided.

[0018]

[Action]

 With the above configuration, even if the blow-by gas flows backward from the outlet side, the blow-by gas is blocked from flowing into the ventilation hole by the outer peripheral surface of the inner housing or the rib-shaped protrusions, so that carbon and the like in the blow-by gas is blocked in the inner housing. It only adheres to the outer peripheral surface of the valve and the outer surface of the rib-shaped projection, and does not adhere between the valve body and the inner housing or in the ventilation hole.

[0019]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. In the embodiment, the same components as those of the above-described conventional technique are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 21 denotes an inner housing having one end side fitted and fixed in the outer housing 3. The inner housing 21 is substantially the same as the inner housing 4 described in the prior art, and one end side thereof has a radial direction. Although the vent holes 21A, 21A are formed opposite to each other to form a stepped tubular shape, in the inner housing 21 according to the present embodiment, each vent hole 21A is, for example, in the circumferential direction with respect to the outlet 6B of the outer housing 3. They are arranged 90 degrees apart.

Reference numerals 22 and 22 denote rib-shaped projections provided around the respective ventilation holes 21A and projecting radially from the inner housing 21, and the rib-shaped projections 22 surround the periphery of the respective ventilation holes 21A. Thus, for example, it is formed in a short tubular shape of, for example, a rectangle or an oval, and projects into the annular passage 6C while ensuring a sufficient gap between the inner circumference of the outer housing 3 and the ventilation passage 6. .

Each vent hole 21 A of the inner housing 21 constitutes the vent passage 6 together with the inlet 6 A and the outlet 6 B of the outer housing 3 and the annular passage 6 C, and the auxiliary air guided from the conduit 2 is supplied to the inner housing 21. From the opening portion 10A of the cylindrical valve body 10 rotatably provided inside, through the ventilation hole 21A of the inner housing 21 to the annular passage 6C and the outlet port 6B, flow in the direction of arrow A.

The idle speed control valve according to the present embodiment has the configuration described above, and its basic operation is not particularly different from that according to the prior art.

However, in the present embodiment, a pair of ventilation holes 21A, which are open in the radial direction at a distance of, for example, about 90 degrees in the circumferential direction from the outlet 6B of the outer housing 3, are formed at one end of the inner housing 21. 21A is provided, and short tubular rib-like projections 22, 22 projecting in the radial direction of the inner housing 21 are provided around the respective vent holes 21A so as to surround the respective vent holes 21A. Even if blow-by gas flows backward from the outlet 6B side of the housing in the direction of the arrow D, the blow-by gas is first blown to the outer peripheral surface of the inner housing 21, and further, the rib-like projections 22 cause it to enter the inside of each vent hole 21A. Controlled to enter.

Therefore, the carbon E contained in the blow-by gas only adheres to the outer peripheral surface of the inner housing 21 and the outer surface of each rib-shaped projection 22, and the carbon E is attached to the tubular valve body 10 and the inner housing. It is possible to reliably prevent the particles from adhering to the vent holes 21 and the inside of each vent hole 21A.

Therefore, according to the present embodiment, it is possible to prevent the flow passage area of the ventilation passage 6 from being narrowed due to the adhesion of the carbon E to the opening portion 10A of the cylindrical valve body 10 and the ventilation hole 21A. The tubular valve body 10 can be smoothly opened and closed for a long period of time, and the reliability and life of the idle speed control valve can be greatly improved.

In the above embodiment, the inner housing 21 is formed with two ventilation holes 21A, 21A in the radial direction, and the inner housing 21 has two openings 10A in a cylindrical shape. Although the present invention is not limited to this, the present invention is not limited to this, and for example, one vent hole is provided in the inner housing 21, and the vent hole is formed at one end of the valve turning shaft 7. You may provide the valve body which consists of a closed bow-shaped or fan-shaped slider.

Although the rib-shaped projections 22 have been described by taking the case of being formed in a tubular shape as an example, the rib-shaped projections 22 are not limited to this. For example, the sides of the vent hole 21A facing the outlet 6B of the outer housing 3 (see FIG. It is also possible to provide only on the lower side of 1) and omit the rib-shaped projection 22 on the upper side.

[0029]

[Effect of device]

 As described in detail above, according to the present invention, the ventilation hole of the inner housing is circumferentially separated from the outlet of the outer housing, and the periphery of the ventilation hole is directed from the outlet of the outer housing into the ventilation hole. Since the rib-shaped protrusions that restrict the reverse flow of gas are provided, even if blow-by gas from the engine body flows back into the outlet, this blow-by gas will not flow into the vent holes, and the outer surface of the inner housing and rib It can be blocked by the protrusions, and carbon etc. in the blow-by gas only adheres to the outer peripheral surface of the inner housing and the outer surface of the rib-like protrusions and adheres between the valve body and the inner housing and in the ventilation hole. Can be effectively prevented. Therefore, it is possible to prevent carbon from adhering to the vent hole of the valve body or the inner housing for a long period of time, and to greatly improve the reliability and life of the idle speed control valve.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an enlarged main part of an idle speed control valve according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an idle speed control valve according to a conventional technique.

FIG. 3 is an enlarged cross-sectional view taken along the arrow III-III direction in FIG.

[Explanation of symbols]

 3 Outer housing 6 Vent path 6A Inlet 6B Outlet 7 Valve body rotating shaft 10 Cylindrical valve body (valve body) 13 Electromagnetic actuator 21 Inner housing 21A Vent hole 22 Rib-like protrusion

Claims (1)

[Scope of utility model registration request] 1. An outer housing having an auxiliary air inlet and an auxiliary air outlet formed therein, and provided in the outer housing.
An inner housing having a vent hole for communicating the inlet and the outlet of the outer housing in a radial direction, and an inner housing rotatably provided with one end opening and closing the vent hole of the inner housing. A valve body rotation axis that has become a valve body that
In an idle speed control valve which is located on the other end side of the valve body rotating shaft and is provided between the inner housing and the electromagnetic actuator for rotating the valve body rotating shaft,
A rib shape that separates the vent hole of the inner housing from the outlet of the outer housing in the circumferential direction, and restricts the backflow of gas from the outlet of the outer housing toward the inside of the vent around the vent hole. An idle speed control valve characterized by having a protrusion.