JPH0743506U - Idle speed control valve - Google Patents

Abstract

(57) [Summary] [Purpose] To properly control the flow rate of auxiliary air according to the idling operation state so that a stable idling operation state can always be obtained. [Structure] By providing a valve element urging member 34 in the upstream side opening portion 32A of the tubular valve body 32, when the auxiliary air passes through the upstream side opening portion 32A, the tubular valve body 32 is provided with a tubular valve. A torque is applied in a direction to increase the opening degree θ between the downstream opening 32B of the body 32 and each ventilation hole 11C of the inner housing 9. Thereby, the tubular valve body 32
The torque acting in the direction of decreasing the opening θ and the torque acting in the direction of increasing the opening θ cancel each other out, and the proper opening θ corresponding to the control of the electromagnetic actuator is obtained.
Therefore, the flow rate of the auxiliary air can be controlled with high accuracy.

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]

 4 to 7 show a conventional idle speed control valve.

In the figure, 1 indicates an intake passage whose one end side is connected to an intake port of the engine 2, and air supplied from the other end side of the intake passage 1 is introduced into a cylinder of the engine 2 and the intake air The amount is increased or decreased according to the valve opening degree of the throttle valve 3 arranged in the intake passage 1.

Reference numeral 4 denotes a bypass passage for introducing the air introduced into the intake passage 1 into the cylinder of the engine 2 by bypassing the throttle valve 3. One end side of the bypass passage 4 is a throttle in the intake passage 1. Inflow side bypass passage 4A opening to the upstream side of the valve 3, outflow side bypass passage 4B having one end opening to the downstream side of the throttle valve 3 in the intake passage 1, inflow side bypass passage 4A and outflow side bypass passage 4B. And a housing 6 which will be described later and is open at the other end side thereof.

Reference numeral 5 denotes an idle speed control valve. The idle speed control valve 5 is provided in the cylinder of the engine 2 via the bypass passage 4 and the housing 6 when the throttle valve 3 fully closes the intake passage 1. It controls the flow rate of the air (auxiliary air) introduced into the engine and operates to keep the engine 2 in a stable idling operation state.

In FIG. 5, reference numeral 6 denotes a housing which constitutes the main body of the idle speed control valve 5. The housing 6 has a stepped cylindrical outer housing 8 to which a conduit 7 is connected to one end side, and one end side to the outside housing 8. A stepped cylindrical inner housing 9 that is fitted and fixed in the outer housing 8 and has the other end protruding outside the outer housing 8 and an electromagnetic housing that is located at the other end of the inner housing 9 and will be described later. It is generally constituted by a resin molding portion 10 integrally molded with the inner housing 9 so as to surround the actuator 18.

Here, an air passage 11 is formed in the housing 6 to allow the auxiliary air flowing in from the inflow side bypass passage 4A through the conduit 7 to flow in the direction of arrow A toward the outflow side bypass passage 4B. ing. The ventilation passage 11 is formed in the outer housing 8, and an auxiliary air inlet 11A communicating with the inflow side bypass passage 4A via the conduit 7 and an inner housing fitted in the outer housing 8 as shown in FIG. Introducing port 11B formed on one end surface of the inner housing 9, ventilation holes 11C and 11C formed on one end of the inner housing 9 in the radial direction to face each other, and an outer peripheral surface of the outer housing 8 as shown in FIG. An annular passage 11D formed between the inner housing 9 and the inner peripheral surface and communicating with the ventilation holes 11C and 11C, and an outer housing 8 formed with an annular passage 11D opening to the outflow bypass passage 4B. And an outflow port 11E.

Reference numeral 12 denotes a cylindrical valve body disposed on the inner peripheral side of one end of the inner housing 9, and the cylindrical valve body 12 is provided on the side of the inlet 11B formed in the inner housing 9 as shown in FIG. An upstream side opening 12A is provided in the upper side of the upper housing 12 and a pair of substantially rectangular downstream side openings 12B are formed at positions corresponding to the ventilation holes 11C formed in the inner housing 9 in the axial direction as shown in FIG. , 12B are formed. Then, the cylindrical valve body 12 is rotated in a direction shown by arrows B and C in FIG. 7 by a valve body rotation shaft 13 described later, and the downstream side opening portion 12B and the ventilation hole 11C of the inner housing 9 are connected. The flow rate of the auxiliary air flowing through the ventilation path 11 is variably adjusted by changing the opening degree θ (hereinafter referred to as the opening degree θ) between them.

Here, as shown in FIG. 7, the opening degree θ is a tubular shape when it becomes + θ with the neutral position where the downstream opening 12B of the tubular valve body 12 opens the vent hole 11C as 0 degree. The valve body 12 is rotated in the direction of arrow B (hereinafter referred to as the opening direction), and when the angle is −θ, the cylindrical valve body 12 is rotated in the direction of the arrow C (hereinafter referred to as the closing direction).

Reference numeral 13 denotes a valve body rotating shaft, and the valve body rotating shaft 13 is rotatably provided in the inner housing 9 via bearings 14 and 15, and has a cylindrical valve body 12 on one end side. Are integrally formed. The other end of the valve body rotating shaft 13 projects outside the inner housing 9 and extends into a yoke 19 that constitutes an electromagnetic actuator 18, which will be described later. The tubular valve body 12 and the valve body rotating shaft 13 may be formed as separate members and integrally fixed.

Reference numeral 16 denotes a cylindrical permanent magnet fitted to the other end of the valve body rotating shaft 13 and fixed to the valve body rotating shaft 13 by a retaining ring 17 or the like. The valve body rotation shaft 13 is rotated by the action of the magnetic force generated from the cylinder valve body 12 and the tubular valve body 12 is rotated in the opening direction and the closing direction, and the opening degree θ is changed according to the change of the magnetic flux from the yoke 19. Change.

Reference numeral 18 denotes an electromagnetic actuator which is located at the other axial end of the valve body rotating shaft 13 and is provided in the resin mold portion 10. The electromagnetic actuator 18 is a permanent magnet 16 and a permanent magnet 16. The yoke halves 19A and 19B are abutted in the axial direction to form a hollow annular shape, and the yoke 19 is inserted into the outer side of the permanent magnet 16 with a minute gap, and the yoke 19 is coaxial with the yoke 19. The electromagnetic coil 20 is composed of an open side coil 20A and a close side coil 20B, which are wound around each other, and an auxiliary coil 21 wound outside the open side coil 20A and the close side coil 20B. . The electromagnetic actuator 18 is connected to a control unit (not shown), and a control current, which is a pulse signal having a predetermined duty ratio, is applied to the electromagnetic coil 20 from the control unit to rotate the valve disc. The tubular valve body 12 is rotated in the opening direction and the closing direction via the moving shaft 13. The auxiliary coil 21 is connected to a DC power supply (not shown), and when adjusting the idle speed of the engine 2 in accordance with the operation of an external load (for example, an air conditioner), the auxiliary coil 2 is connected to the auxiliary coil 2 from the DC power supply. Power is supplied to 1.

The idle speed control valve according to the prior art has the above-described configuration, and a control current, which is an inverted pulse signal, is applied from the control unit to the open side coil 20A and the close side coil 20B of the electromagnetic coil 18. Then, by exciting the electromagnetic coil 20, magnetic fluxes corresponding to the pulse duty ratio are generated from the yoke 19 toward the permanent magnet 16. Then, the turning position of the valve body turning shaft 13 is regulated by the interaction of the magnetic field of the yoke 19 and the permanent magnet 16.

As described above, in the idle speed control valve, the flow passage area of the ventilation passage 11 is adjusted by restricting the turning direction and the opening degree θ of the tubular valve body 12 to adjust the bypass passage 4 Also, the flow rate of auxiliary air introduced into the cylinder of the engine 2 through the housing 6 is adjusted, and the idle speed of the engine 2 is controlled so as to maintain a stable idling operation state.

Next, when the idle speed decreases by operating an air conditioner or the like that is an external load of the engine 2, a direct current of an energizing amount corresponding to this load is applied to the auxiliary coil 21. The auxiliary coil 21 is excited together with the electromagnetic coil 20 to increase the turning torque applied to the valve body turning shaft 13 between the yoke 19 and the permanent magnet 16. As a result, the opening degree θ increases to the + θ side and the tubular valve body 12 further rotates in the opening direction. As a result, the flow rate of the auxiliary air introduced into the cylinder of the engine 2 increases, and it is possible to prevent the idle speed of the engine 2 from decreasing due to the operation of the external load such as the air conditioner.

Thus, when the engine 2 is in the idling operation state, it is possible to prevent the engine stall from occurring by operating the external load such as the air conditioner.

[0017]

[Problems to be solved by the device]

 By the way, when the idle speed control valve according to the prior art described above is operated, the inventor of the present application understands that the auxiliary air introduced into the cylinder of the engine 2 through the bypass passage 4 and the housing 6 causes the cylindrical valve body 12 to receive the auxiliary air. When passing from the upstream side opening 12A to each downstream side opening 12B, a torque in the closing direction acts on the tubular valve body 12 due to a pressure loss or the like generated in the air passage 11, and the torque in the closing direction is It was confirmed that the flow velocity of the auxiliary air flowing through the ventilation passage 11 increases as the flow velocity increases.

As described above, due to the torque acting in the closing direction on the tubular valve body 12, the opening degree θ is always smaller than the value that should be taken in order to obtain a stable idling operation state of the engine 2. Will be taken. As a result, the flow rate of the auxiliary air introduced into the cylinder of the engine 2 may not be properly increased depending on the operation of the external load.

The present invention has been made in view of the above-mentioned problems of the prior art, and always obtains a stable idling operation state by always properly controlling the flow rate of the auxiliary air according to the operation of the external load. The purpose is to provide an idle speed control valve that is capable of doing so.

[0020]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, an idle speed control valve according to the present invention is provided with a housing having a vent hole for auxiliary air, and is rotatably provided in the housing to open and close the vent hole of the housing. A valve body, a valve body rotation shaft that is provided integrally with the valve body and that rotates the valve body, and a valve body rotation shaft that is provided between the valve body rotation shaft and the housing. And an electromagnetic actuator that rotates the valve body together.

The feature of the configuration adopted by the present invention is that the valve element biases the valve element so as to bias the valve element in a direction in which the vent hole opens when receiving auxiliary air flowing through the vent hole. There is a means.

[0022]

[Action]

 With the above structure, the valve element urging means applies a force to the valve element in the direction to open the vent hole, so that the force acting on the valve element in the direction to close the vent hole is applied to the valve element. It is offset by the force in the opening direction generated by the step.

[0023]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Incidentally, in the embodiment, the same components as those of the prior art shown in FIG. 5 and FIG.

In the figure, reference numeral 31 denotes an idle speed control valve according to the present embodiment. The idle speed control valve 31 is similar to the idle speed control valve 5 described as the prior art, and is the outer housing 8 and the inner housing. A housing 6 having a housing 9, a ventilation passage 11 formed in the housing 6, a cylindrical valve body 32 and a valve body rotating shaft 33 rotatably arranged in the inner housing 9, and a cylindrical valve body. 32 and an electromagnetic actuator 18 that applies a torque to the valve body rotation shaft 33.

However, the idle speed control valve 31 according to the present embodiment is different from the idle speed control valve of the related art in that the shape of the tubular valve element 32 and the valve element urging member 34 described later are provided on the tubular valve element 31. It is different from the speed control valve 5.

Reference numeral 32 denotes a tubular valve body of the present embodiment arranged on one end inner peripheral side of the inner housing 9, and the tubular valve body 32 is similar to the tubular valve body 12 of the prior art. An upstream opening 32A is provided on the side of the inlet 11B formed in the inner housing 9, and a pair of substantially rectangular downstream openings 32B are provided at positions corresponding to the ventilation holes 11C formed in the inner housing 9 in the axial direction. , 32B are formed, but a fitting step portion 32C is formed on the inner peripheral side of the peripheral edge portion of the upstream side opening portion 32A over the entire circumference thereof.

Reference numeral 33 denotes a valve body rotating shaft integrally formed with the tubular valve body 32. The valve body rotating shaft 33 is substantially the same as the valve body rotating shaft 13 of the prior art in the inner housing 9. The other end, which is rotatably provided via bearings 14 and 15 and protrudes to the outside of the inner housing 9, extends into a yoke 19 that constitutes the electromagnetic actuator 18.

Reference numeral 34 denotes a valve body urging member provided on the tubular valve body 32, and the valve body urging member 34 is fitted to a fitting step portion 32 C of the tubular valve body 32 as shown in FIG. It is composed of a tubular member 35 to be fixed and a blade member 36 extending in the radial direction of the tubular member 35 and having both ends fixed to the inner peripheral surface of the tubular member 35. Then, the blade member 36 is configured so that the two blades formed in the same blade shape including the arc surface 36A and the flat plate surface 36B are point-symmetrical with respect to each other with the radial center of the tubular member 35 as the center point. It is configured by being connected.

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

However, in the present embodiment, the valve body urging member 34 is provided in the upstream opening 32A of the tubular valve body 32, so that the following operational effects can be obtained.

That is, when the engine 2 is in the idling operation state and, for example, the tubular valve body 32 is at a position where the opening degree θ is 0 degree as shown in FIG. 7, the ventilation path 11 in the housing 6 is When the introduced auxiliary air escapes from the upstream side opening portion 32A of the tubular valve body 32 to the downstream side opening portion 32B as indicated by an arrow A in the figure, the loss of pressure or the like in the ventilation passage 11 may cause a loss of pressure. A torque in the closing direction indicated by an arrow C'in FIG. 2 is applied to the valve body 32.

On the other hand, when the auxiliary air passes through the upstream opening 32A of the tubular valve element 32, the blade member 36 forming the valve element urging member 34 has a circular arc surface 36A side and a flat plate surface 36B side. A pressure force difference (low pressure on the circular arc surface 36A side and high pressure on the flat plate surface 36B side) is generated, and due to this pressure difference, a lift force is generated from the flat plate surface 36B toward the circular arc surface 36A side. Therefore, the torque in the opening direction indicated by the arrow B ′ in FIG. 2 acts on the tubular valve body 32 provided with the valve body biasing member 34. The lift force from the flat plate surface 36B of the wing member 36 toward the arc surface 36A increases as the flow velocity of the auxiliary air passing through the wing member 36 increases, and in accordance with this, the opening direction acting on the cylindrical valve body 32. The torque to will also increase.

As described above, by providing the valve body biasing member 34 having the blade member 36 in the upstream side opening 32 A of the tubular valve body 32, the auxiliary air flows through the ventilation passage 11 in the housing 6. At this time, the torque in the closing direction and the torque in the opening direction act on the tubular valve body 32 at the same time and cancel each other out. As a result, the opening degree θ appropriately corresponding to the pulse duty ratio of the control current supplied from the control unit to the electromagnetic coil 20 and the amount of direct current supplied from the DC power supply to the auxiliary coil 21 is obtained, The engine 2 can be controlled with high accuracy to obtain a stable idling operation state.

In the above-described embodiment, the blade member 36 provided on the valve element biasing member 34 is described as having the arcuate surface 36A and the flat plate surface 36B, but the present invention is not limited to this. Any member having a shape such as a propeller shape, a fan shape, or the like that receives an airflow from the axial direction to generate torque can be suitably used as the blade member.

Further, in the above-described embodiment, the housing 6 is configured by being divided into the outer housing 8 and the inner housing 9, but an integrally formed housing may be used, or the engine casing. In the case where the outer housing is configured as described above, the housing may be composed of only the inner housing 9.

[0036]

[Effect of device]

 As described above in detail, according to the present invention, the valve body is attached to the opening on the upstream side of the valve body that opens and closes the ventilation hole in the direction in which the ventilation hole opens when receiving the auxiliary air flowing through the ventilation hole. Since the valve element urging means for urging the valve element is provided, when the auxiliary air passes through the upstream side opening of the valve element, the force acting on the valve element in the direction of closing the vent hole is applied. By the means, it can be offset by the biasing force acting on the valve body. As a result, the amount by which the valve body actually opens the ventilation hole properly corresponds to the control by the electromagnetic actuator, and the flow rate of the auxiliary air can be controlled with high accuracy in order to always obtain a stable idling operation state. You can

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an idle speed control valve according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an inner housing, a cylindrical valve body, a valve body biasing member and the like in FIG. 1 in an enlarged manner.

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is an explanatory diagram showing a positional relationship of idle speed control valves according to a conventional technique together with a part of an intake passage of an engine.

FIG. 5 is a vertical sectional view showing an idle speed control valve according to a conventional technique.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

 6 Housing 8 Outer Housing 9 Inner Housing 11A Inlet 11B Inlet 11C Vent Hole 11D Annular Passage 11E Outlet 18 Electromagnetic Actuator 31 Idle Speed Control Valve 32 Cylindrical Valve Body 32A Upstream Side Opening 32B Downstream Opening 33 Valve Body Moving shaft 34 Valve body biasing member 36 Wing member

Claims (1)

[Scope of utility model registration request] 1. A housing having a vent hole for auxiliary air, a valve body rotatably provided in the housing for opening and closing the vent hole of the housing, and a valve body integrally provided with the valve body. A valve body rotating shaft for rotating the valve body, and an electromagnetic actuator provided between the valve body rotating shaft and the housing for rotating the valve body together with the valve body rotating shaft. The idle speed control valve comprising Idle speed control valve.