JPH05172020A - Rotary solenoid type actuator - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an abnormal sound in a gap between the external surface of a valve plate and the internal surface of a housing, regarding a rotary solenoid type actuator used as a valve for controlling the flow rate of fluid via the turning of the valve plate. CONSTITUTION:A housing 11b having an air inlet 11a and an air outlet 11b is provided therein with a drive shaft 12 and a valve plate 15 turned thereby for opening and closing the outlet 11b. The valve plate 15 has a valve plate body 15a formed by cutting out a cylindrical member along an axial direction, and the divisional member 11c of the housing 11 is so formed as to have internal surface 11d faced to the external surface 15c of the body 15a. The internal surface 11d is fitted with a seal member 40 and the end thereof is in pressed contact with the external surface 15c of the valve plate 15. According to this construction, an air flow in a gap 30 between the internal surface 11d and the external surface 15c is completely interrupted, thereby preventing the occurrence of an abnormal sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary solenoid type actuator, and more particularly to a rotary solenoid type actuator used as a valve for controlling a flow rate of a fluid by rotating a valve body.

[0002]

2. Description of the Related Art A conventional rotary solenoid type actuator is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-92541. The rotary solenoid actuator disclosed in this publication is provided in a bypass passage that bypasses a throttle valve in an intake system of an internal combustion engine, and adjusts an amount of air passing through the bypass passage to control an idle rotation speed of the internal combustion engine. It is a thing (idle speed control valve). The structure generally has a housing having an air inlet and an air outlet, and a portion along the axial direction of the circumferential surface of the cylinder on the outer peripheral surface, and is rotatable about the axis of the cylinder. A valve body provided in the housing, a drive shaft for rotating the valve body,
The rotary solenoid drive unit drives the drive shaft, that is, the valve element in the rotational direction in response to the pulse signal at a predetermined duty ratio.

The valve body has a rotational position in which the outer peripheral surface of the valve body covers the outlet of the housing to fully close the outlet, and a rotational position in which the outer peripheral surface enters the housing to fully open the outlet. And the opening area of the outflow port is variable in correspondence with the rotational position of the valve element in the meantime. The air passing through the bypass passage enters the housing through the inflow port, flows through the housing toward the outflow port,
It is discharged from the outflow port whose opening area is determined by the rotating position of the valve body.

[0004]

In the above conventional structure, the outer peripheral surface of the circumferential surface forming the valve body and the inner surface of the housing facing the outer peripheral surface are opposed to each other when the valve opening is changed. Since it is displaced in the circumferential direction, a slight gap is provided between the outer peripheral surface and the inner surface of the housing in order to smoothly displace both members. Therefore, a part of the air that has entered the housing from the inflow port flows toward the outflow port through the gap without passing through the original flow passage in the housing, and at this time, abnormal noise due to air vibration is generated. Occur. Particularly, in the above-described conventional example in which the rotary solenoid type actuator is applied to the intake system of the internal combustion engine, the abnormal noise may resonate in the intake pipe and the surge tank to become a loud noise.

Therefore, the present invention has been made in view of the above problems, and prevents the generation of abnormal noise in the gap by blocking the flow of air in the gap between the outer peripheral surface of the valve body and the inner surface of the housing. It is an object to provide a rotary solenoid type actuator.

[0006]

In order to achieve the above object, the present invention has a housing having a fluid inlet and a fluid outlet, and a portion of an outer circumferential surface of a cylindrical circumferential surface along the axial direction. A valve element that is rotatably provided in the housing about the axis of the cylinder and that can change the opening area of the outflow port or the inflow port according to the rotational position of the outer peripheral surface; In a rotary solenoid type actuator consisting of a drive unit for driving the valve element to the required turning position,
The seal functional component is provided between the outer peripheral surface of the valve body and the inner surface of the housing facing the outer peripheral surface.

[0007]

In the present invention, since the seal function component is provided between the outer peripheral surface of the valve body and the inner surface of the housing where the outer peripheral surfaces face each other, the gap between the outer peripheral surface of the valve body and the inner surface of the housing is reduced. The flow of the fluid is blocked, and the generation of abnormal noise when the fluid flows through the gap can be prevented.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the construction of an embodiment in which the rotary solenoid type actuator according to the present invention is applied to an idle speed control valve (ISCV) of an internal combustion engine, and FIG. 2 is a sectional view taken along the line II--II in FIG. And IS
FIG. 3 shows the valve open state of the CV, and FIG. 3 shows the valve closed state of the ISCV in the same cross section as in FIG.

In each figure, 11 is a housing made of a non-magnetic material such as synthetic resin or aluminum, and is provided with an air inlet 11a and an air outlet 11b. A drive shaft 12 is rotatably supported by bearings 13 and 14 in the housing 11, and a valve body 15 is integrally attached to the drive shaft 12.

The valve body 15 is, as shown in FIGS. 1 and 3, a valve body 15 for closing the outlet 11b of the housing 11.
and an arm portion 15b extending vertically from both ends of the valve body 15a and fixing the valve body 15a to the drive shaft 12. The valve body 15a has a shape in which a cylindrical member is partially cut out along the axial direction, and has a size that covers the entire outlet 11b. The valve body 15a is fixed to the drive shaft 12 by an arm 15b so as to be coaxial with the drive shaft 12. Therefore, the outer peripheral surface 15c of the valve body 15a is
It has a circumferential surface shape concentric with the drive shaft 12.

On the other hand, a partition member 11c is formed between the inflow port 11a and the outflow port 11b of the housing 11 as shown in FIGS. At the end of the partition member 11c on the valve body 15 side, an inner peripheral surface 11d having a circumferential surface shape concentric with the drive shaft 12 is formed similarly to the outer peripheral surface 15c. Therefore, as shown in FIG.
Is rotated clockwise to the maximum extent and the outflow port 11b is opened, the outer peripheral surface 15c of the valve body 15 and the inner peripheral surface 11d of the housing 11 face each other, and between the respective surfaces. A slight gap 30 having a constant gap size is formed in the. As described above, the gap 30 is provided in the valve body 15
This is for smoothing the rotational movement of the.

Further, a groove along the axial direction of the drive shaft 12 is formed at the center of the outer peripheral surface 11d formed on the end surface of the partition member 11c, and this groove is made of synthetic rubber. The seal member 40 having a shape of a ring is fitted and fixed. The tip of the seal member 40 is in pressure contact with the outer peripheral surface 15c by the elastic compression force of the rubber material over the entire length of the valve body 15a in the longitudinal direction.
Therefore, the gap 30 is in a state where the inlet 11a side and the outlet 11b side of the housing 11 are completely blocked by the seal member 40.

A permanent magnet 16 is provided at one end of the drive shaft 12.
Are fitted and fixed, and are rotated integrally with the drive shaft 12. An electromagnetic coil device 17 is provided corresponding to the magnet 16 portion. In this electromagnetic coil device 17, the first and second coils that generate magnetic fluxes in mutually opposite directions are wound by, for example, bifarar winding so that they are wound at the same time. A pulsed exciting current with open duty set and a pulsed exciting current with closed duty set are supplied to the first and second coils, respectively. However, since the motion of the valve body 15 in the rotation direction cannot actually follow the cycle of the pulsed excitation current of the open and close, the valve body 15 is at the rotation position balanced by the duty ratio of the open and close. It operates to stop, and the opening area of the outlet 11b, that is, the opening degree of the ISCV 10 is determined by this.

A guard arm 18 is attached to the opposite end of the drive shaft 12, and the guard arm 18 is engaged with one end of a bimetal 19 wound in a coil shape. Further, around the bimetal 19, a cooling water passage (not shown) through which the cooling water of the engine flows is provided, and the bimetal 19 is deformed by the temperature of the cooling water so that the rotation range of the drive shaft 12 is within a predetermined range. It is regulated to. Therefore, the bimetal 19 mechanically restrains the opening degree of the outlet 11b by the valve body 15, that is, the flow rate of air according to the warm-up state of the engine.

The ISCV 10 having the above structure is attached to an intake pipe 21 of an internal combustion engine (not shown) as shown in FIG. 1, and an inflow port 11a of the housing 11 has a throttle valve 22.
Is connected to the upstream side of the throttle valve 22 on the pipeline, and the outlet 11b is connected to the downstream side of the throttle valve 22. Therefore, the throttle valve 2
In the idle state in which 2 is in the fully closed state, the opening position of the ISCV 10 is controlled by appropriately determining the rotational position of the valve body 15 by the duty ratio, and as shown by the thick arrows in FIGS. The air on the upstream side of the throttle valve 22 enters the housing 11 through the inflow port 11a, flows from the inside of the housing 11 through the outflow port 11b to the bypass passage 23, and finally flows to the downstream side of the throttle valve 22. Thus, when the internal combustion engine is idle, the intake air amount to the internal combustion engine that bypasses the throttle valve 22 is adjusted by the opening degree of the ISCV 10 to adjust the idle speed of the internal combustion engine.

In the above-described air flow, when the air flows from the inflow port 11a of the housing 11 toward the outflow port 11b, in the conventional case, the air flows as described above.
5 flows through the gap 30 between the outer peripheral surface 15c of No. 5 and the inner peripheral surface 11d of the partitioning member 11c from the inflow port 11a toward the outflow port 11b. Was there. However, in the structure of the present embodiment, the seal member 40 having the above structure is provided in the gap 30.
Is provided, and the air flow in the gap 30 is completely cut off. Therefore, in the conventional ISCV 10, the abnormal noise generated in the gap 30 is
The occurrence is completely prevented. In this embodiment, since the seal member 40 is provided, the entire amount of the air that has passed through the flow port 11a passes through the drive shaft 12 side of the valve body 15a and flows toward the outflow port 11b.

As described above, FIG. 2 shows the fully opened state of the ISCV 10. In this state, the tip of the seal member 40 is pressed against the substantially central portion of the outer peripheral surface 15c of the valve body 15a to form the gap 30. Completely shut off. Therefore, the effect of preventing the generation of abnormal noise can be sufficiently obtained. When the valve body 15 rotates counterclockwise to bring the ISCV 10 into a fully closed state, as shown in FIG.
About half of 5c faces the inner peripheral surface 11d of the partition member 11c, and the sealing member 40 is in pressure contact with the end of the outer peripheral surface 15c. Therefore, even in this case, the gap 30
The air flow is blocked by the seal member 40, and the same effect as described above can be obtained. As described above, in the ISCV 10 of the present embodiment, the flow of air is completely cut off by the seal member 40 in the gap 30 at any rotating position of the valve body 15 from the fully open state to the fully closed state of the outlet 11b. It is possible to prevent the abnormal noise generated in the above.

In this embodiment, as described above, the ISCV is used.
Since the abnormal noise in 10 can be cut off at the generation source, the fear that the abnormal noise in ISCV 10 resonates in the intake pipe 21 or the surge tank (not shown) to become a loud noise is completely eliminated. Therefore, in the conventional internal combustion engine, in order to prevent the abnormal noise in the ISCV from resonating in the intake pipe or the surge tank and becoming a loud noise, a resonator (silencer) designed to maximize the silencing effect in advance. However, in the present embodiment, the resonator is not necessary, the cost for optimal design of the resonator is not necessary, and the space for arranging the resonator is not necessary. Can also be obtained.

A system such as a positive crankcase ventilation (PCV) for forcibly ventilating the inside of the crankcase by using the negative pressure of the intake pipe is provided by the ISC.
The air passing through V10 contains unburned gas, combustion products, oil mist, and the like. Therefore, in the conventional configuration, when air flows through the gap for a long time, carbon components may adhere and grow in the gap, hindering smoothness of rotation of the valve body or sticking of the valve body. there were. However, according to the configuration of the present embodiment, the air does not flow in the gap 30, so that the carbon component does not adhere and grow in the gap 30. As a result, the sticking of the valve body 15 can be prevented, and the smoothness of the operation of the valve body 15 can be favorably maintained, so that the reliability of the ISCV 10 can be improved as compared with the conventional case.

Although the seal member 40 is provided on the partition member 11c side of the housing 11 in the above embodiment, the present invention is not limited to the above embodiment, and any rotation of the valve body 15 is possible. A seal member may be fixed to the valve body 15 as long as the gap 30 is blocked even at the position.

[0022]

As described above, according to the present invention, the flow of the fluid in the gap between the outer peripheral surface of the valve body and the inner surface of the housing facing the outer peripheral surface of the valve body is blocked, so that the above-mentioned gap is provided. It is possible to prevent an abnormal noise generated when the fluid flows through. Further, since the flow of the fluid in the gap is blocked, the components contained in the fluid are prevented from adhering to and growing in the gap, the smoothness of the rotation of the valve body is maintained well, and the valve body is fixed. There is no possibility. As a result, the reliability of the rotary solenoid actuator can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of the configuration of an embodiment in which a rotary solenoid type actuator according to the present invention is applied to an idle speed control valve (ISCV) of an internal combustion engine.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
The valve opening state of V is shown.

FIG. 3 is a sectional view taken along line II-II in FIG.
The valve closed state of V is shown.

[Explanation of symbols]

10 Idle speed control valve (ISC
V) 11 housing 11a inflow port 11b outflow port 11c partition member 11d inner peripheral surface 12 drive shaft 15 valve body 15a valve body main body 15b arm portion 15c outer peripheral surface 16 magnet 17 electromagnetic coil device 21 intake pipe 22 throttle valve 30 gap 40 sealing member

Claims (1)

[Claims] 1. A housing having a fluid inflow port and a fluid outflow port, and a portion on the outer peripheral surface along the axial direction of the circumferential surface of the cylinder, wherein the housing is rotatable about the axis of the cylinder. The valve body is provided in the housing and has a variable opening area of the outlet or the inlet corresponding to the rotational position of the outer peripheral surface, and a drive unit for driving the valve element to the required rotational position. A rotary solenoid type actuator, wherein a seal functional component is provided between an outer peripheral surface of the valve body and an inner surface of the housing facing the outer peripheral surface.