JP2582254Y2 - Idle speed control valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle speed control valve suitably used for controlling an idle speed of an engine for an automobile, for example.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show a conventional idle speed control valve.

In FIG. 1, reference numeral 1 denotes a housing constituting a main body of the idle speed control valve.
Is a stepped cylindrical outer housing 3 to which the conduit 2 is connected at one end (left side in FIG. 2), one end of which is fitted and fixed in the outer housing 3, and the other end of which is the outer housing 3.
A stepped cylindrical inner housing 4 protruding to the outside and a resin mold part 5 located on the other end side of the inner housing 4 and integrally formed with the inner housing 4 so as to surround an electromagnetic actuator 13 described later. It is roughly configured.

Here, the housing 1 bypasses a throttle valve (not shown) of an automobile engine via a conduit 2 and is directed from an upstream side of the throttle valve into an engine cylinder (not shown). A ventilation path 6 for circulating auxiliary air in the direction indicated by arrow A is formed. The ventilation path 6 is formed in the outer housing 3 and has an inlet 6A for auxiliary air communicating with the conduit 2 and an outlet for communicating with the cylinder side. 6B
And 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 is connected through a cylindrical valve body 10 to be described later. As shown in FIG.
As shown in FIG.
6D.

[0005] Reference numeral 7 denotes a valve body rotating shaft rotatably provided in the inner housing 4 via bearings 8 and 9. A cylindrical valve body 10 that is open to the inflow port 6A and whose base end is closed is provided integrally. The cylindrical valve body 10 has a pair of openings 10A, 10A in the radial direction as shown in FIG. Are formed in a substantially rectangular shape.

The cylindrical valve body 10 is rotated together with the valve body rotating shaft 7 in directions indicated by arrows B and C in FIG.
By changing the opening degree θ between the air passage 6 and each ventilation hole 6D, the flow passage area of the air passage 6 is variably adjusted. Also,
The other end of the valve body rotating shaft 7 projects outside the inner housing 4,
Yoke 14 constituting electromagnetic actuator 13 to be described later
Extends in the axial direction.

[0007] 11 is fitted to the other end of the valve body rotating shaft 7,
The permanent magnet 11 is fixed to the valve body rotating shaft 7 by a retaining ring 12 or the like. The permanent magnet 11 rotates the valve body rotating shaft 7 by the action of a magnetic force generated from the yoke 14, The valve body 10 is rotated in directions indicated by arrows B and C in FIG. 3 to change the opening degree θ in accordance with a change in magnetic flux from the yoke 14.

Reference numeral 13 denotes an electromagnetic actuator provided in the resin mold portion 5 at the other end in the axial direction of the valve body rotating shaft 7. The electromagnetic actuator 13 includes the permanent magnets 11 and 2. The yoke halves 14A and 14B are formed in a hollow annular shape by abutting in the axial direction.
A yoke 14 inserted through a small gap outside
It is roughly composed of a first electromagnetic coil 15 and a second electromagnetic coil 16 wound around the yoke 14. The electromagnetic actuator 13 is connected to a control unit (not shown) via a connector 17 protruding out of the resin mold portion 5, and a control signal having a predetermined pulse duty is applied from the control unit. Thus, the cylindrical valve body 10 is rotated in the directions indicated by 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 configuration. For example, the idle speed control valve bypasses a throttle valve in an automobile engine, and an auxiliary air passage is provided before and after the throttle valve. It is arranged to connect via.

Then, a current is supplied from the control unit to the first electromagnetic coil 15 via the connector 17, and a magnetic flux is generated from the yoke 14 toward the permanent magnet 11 by exciting the electromagnetic coil 15. A rotation torque is generated on the valve body rotating shaft 7 by the interaction of, for example, the cylindrical valve body 10 is rotated in the direction of arrow B in FIG. Each ventilation hole 6D of ventilation path 6
Is adjusted between the two. As a result, the flow passage area of the ventilation passage 6 is adjusted, so that the amount of auxiliary air flowing in the direction indicated by the arrow A through the conduit 2 is bypassed from the upstream side of the throttle valve of the engine to the cylindrical valve body. 10 degree of opening θ
The auxiliary air amount is adjusted according to the operating state of the engine body, and the idle speed is controlled.

Next, when an air conditioner or the like, which is an external load of the engine, is operated, a voltage of a current amount corresponding to the load is applied to the second electromagnetic coil 16 so that the electromagnetic coil 1 is turned on.
6 is excited together with the electromagnetic coil 15 to increase the rotation torque applied to the valve body rotation shaft 7 between the yoke 14 and the permanent magnet 11. As a result, the cylindrical valve body 10 is further rotated in the direction of arrow B in FIG. 3, the amount of auxiliary air is increased by increasing the opening degree θ, and the idling speed of the engine is reduced to the load of an air conditioner or the like. It is variably controlled accordingly.

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

[0013]

In the above-mentioned conventional idle speed control valve, the cylindrical valve element 10 provided on the valve element rotating shaft 7 is connected to the electromagnetic actuator 13.
To adjust the opening degree θ between each opening 10A of the cylindrical valve body 10 and each ventilation hole 6D of the ventilation path 6 provided in the inner housing 4 to thereby adjust the flow path of the ventilation path 6. The area is adjusted, and the amount of auxiliary air flowing through the conduit 2 is controlled.

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 (both not shown) is opened from the combustion chamber of the engine. When the blow-by gas initially flows backward in the direction indicated by the dashed line D in the outlet 6B through the intake pipe, the carbon E contained in the blow-by gas is removed.
And the like easily adhere to the ventilation hole 6D and the opening 10A of the cylindrical valve body 10, and the attached carbon E reduces the opening area of the ventilation passage 6, and the carbon E is gradually deposited on the peripheral portion of the ventilation hole 6D. There is a problem that the sliding resistance when the cylindrical valve element 10 rotates is greatly increased due to accumulation and fixation of the cylindrical valve element 10.

For this reason, in the prior art, the adhesion of the 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 it becomes impossible to accurately control the amount of auxiliary air. Eventually, the tubular valve body 10 and the inner housing 4 are fixed, and the tubular valve body 10 malfunctions, so that there is a problem that the idle speed control of the engine cannot be performed.

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 ventilation hole of an inner housing and a valve element for opening and closing the ventilation hole. Can be prevented, the flow path area of the ventilation path can be prevented from decreasing, and the sliding resistance at the time of opening and closing the valve element can be prevented from increasing, so that the idle speed can be controlled stably for a long period of time. It is an object of the present invention to provide an idle speed control valve having the above configuration.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a feature of the present invention is that a ventilation hole of an inner housing is circumferentially separated from an outlet of an outer housing, and a periphery of the ventilation hole is formed. Is provided with a rib-like projection for restricting gas from flowing backward from the outlet of the outer housing toward the inside of the ventilation hole.

[0018]

According to the above construction, even if the blow-by gas flows backward from the outlet, the blow-by gas is prevented from flowing into the ventilation hole by the outer peripheral surface of the inner housing and the rib-like projections. Only adheres to the outer peripheral surface of the inner housing 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]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the embodiments, the same components as those of the above-described conventional technology are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 21 denotes an inner housing whose one end is fitted and fixed in the outer housing 3. The inner housing 21 has a radially extending end at one end similar to the inner housing 4 described in the prior art. Vent holes 21A, 21 facing each other
A is formed and has a stepped cylindrical shape, but in the inner housing 21 according to the present embodiment, each ventilation hole 21A is disposed at a distance of, for example, about 90 degrees in a circumferential direction from the outlet 6B of the outer housing 3. Have been.

Reference numerals 22 and 22 denote rib-shaped projections provided around the respective ventilation holes 21A so as to protrude from the inner housing 21 in the radial direction.
A is formed, for example, in a rectangular or oval short cylindrical shape so as to surround the periphery of A. The annular passage 6C is formed while ensuring a sufficient clearance to form the ventilation path 6 with the inner periphery of the outer housing 3. It protrudes into.

The ventilation holes 2 of the inner housing 21
1A is an inlet 6A and an outlet 6 of the outer housing 3.
B, the ventilation passage 6 is formed together with the annular passage 6C, and the auxiliary air guided from the conduit 2 is opened from the opening 10A of the cylindrical valve body 10 rotatably provided in the inner housing 21 to the ventilation hole of the inner housing 21. The fluid flows in the direction of the arrow A to the annular passage 6C and the outlet 6B via the outlet 21A.

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

However, in this embodiment, the inner housing 2
A pair of ventilation holes 21A, 21A are provided at one end side of the outer housing 3 with an outlet 6B of the outer housing 3 at a distance of, for example, about 90 degrees in the circumferential direction and open in the radial direction.
A short cylindrical rib-like projections 22, 22 projecting in the radial direction of the inner housing 21 are provided around the periphery of each ventilation hole 21A, so that, for example, blow-by from the outlet 6B side of the outer housing. Even if the gas flows backward in the direction indicated by the arrow D, the blow-by gas is first blown to the outer peripheral surface of the inner housing 21, and the rib-shaped projections 22 restrict the intrusion into the ventilation holes 21 </ b> A.

For this reason, 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 protrusion 22, and the carbon E is transferred to the cylindrical valve body 10 and the inner housing 21. It can be reliably prevented from adhering to the gaps and the inside of each ventilation hole 21A.

Therefore, according to this embodiment, the cylindrical valve element 10
It is possible to prevent the flow path area of the ventilation path 6 from being narrowed by the attachment of the carbon E to the opening 10A and the ventilation hole 21A, and to smoothly open and close the tubular valve body 10 for a long period of time. The reliability and life of the idle speed control valve can be greatly improved.

In the above embodiment, the inner housing 2
1, two ventilation holes 21A, 21A are formed in the radial direction,
Although it has been described that the cylindrical tubular valve body 10 having two openings 10A is provided in the inner housing 21,
The present invention is not limited to this. For example, a valve formed of an arc-shaped or fan-shaped slider or the like that has one vent hole in the inner housing 21 and opens and closes the vent hole at one end of the valve body rotating shaft 7. A body may be provided.

Further, although the case where each rib-like projection 22 is formed in a cylindrical shape has been described as an example, the present invention is not limited to this. For example, the side facing the outlet 6B of the outer housing 3 around the ventilation hole 21A (see FIG. 1), and the upper rib-like projection 2
The part 2 may be omitted.

[0029]

As described above in detail, 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 formed from the outlet of the outer housing. Since the rib-shaped projections for restricting the gas from flowing backward into the ventilation hole are provided, even if the blow-by gas from the engine body flows backward into the outlet, the blow-by gas flows into the ventilation hole at the outer periphery of the inner housing. Surface and rib-like projections, so that carbon and the like in the blow-by gas adhere only to the outer peripheral surface of the inner housing and the outer surface of the rib-like projections, and adhere to the gap between the valve element and the inner housing and in the ventilation holes Can be effectively prevented.
Therefore, it is possible to prevent carbon from adhering to the ventilation holes of the valve body and the inner housing for a long period of time, and it is possible to greatly improve the reliability and life of the idle speed control valve.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a conventional idle speed control valve.

FIG. 3 is an enlarged sectional view taken along a direction indicated by arrows III-III in FIG. 2;

[Explanation of symbols]

 Reference Signs List 3 outer housing 6 ventilation path 6A inflow port 6B outflow port 7 valve body rotating shaft 10 cylindrical valve body (valve body) 13 electromagnetic actuator 21 inner housing 21A ventilation hole 22 rib-shaped projection

Claims (1)

(57) [Scope of request for utility model registration] 1. An outer housing having an inlet and an outlet for auxiliary air formed therein, provided in the outer housing,
An inner housing formed with a ventilation hole for radially communicating the inflow port and the outflow port of the outer housing; a rotatably provided inside the inner housing, one end of which opens and closes the ventilation hole of the inner housing; A valve element rotating shaft serving as a valve element
An idle speed control valve, which is provided 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-like shape that circumferentially separates the vent hole of the inner housing from the outlet of the outer housing and that restricts gas from flowing back into the vent hole from the outlet of the outer housing around the vent hole. An idle speed control valve having a projection.