JPH0131823Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow control valve used in an idling speed control device for an internal combustion engine or other fluid control devices.

For example, conventional air flow control valves used in internal combustion engine idling speed control devices control the air flow by driving a step motor to move the valve forward and backward, opening and closing a control port provided on the valve body. (Reference document JP-A-57-97043). An example of the structure of a conventional air flow control valve will be described with reference to FIGS. 1 and 2. A valve body 2 is fixed to a step motor 1, and a through hole 13 is formed in the center of the valve body 2. It is provided so as to communicate with the air inlet 3. A sleeve 5 is inserted into the through hole 13. As shown in FIG. 2, the sleeve 5 has a flange portion 5a, two cutout portions 5b, and a plurality of control ports 4. With the C-shaped member 9 fitted in the notches 5b, 5b in advance, the sleeve 5
is inserted into the through hole 13 of the valve body 2, and the sleeve 5 is fixed to the valve body 2 by pressing the flange portion 5a against the stepped portion 2a provided on the valve body 2. A space provided in the center of the through hole 13 is partitioned by the sleeve 5 to form an annular passage 14.

A nut member 8a is screwed into a drive male screw 7 formed on the drive shaft 6 of the step motor 1, and a valve 8c is screwed into a male screw 8b formed on the outer periphery of the nut member 8a. The outer peripheral surface of the valve 8c is slidably fitted into the inner peripheral surface of the sleeve 5. A notch (flat surface) 8d provided from the center to the end of the valve 8c comes into sliding contact with the inner flat surface 9a of the C-shaped member 9 shown in FIG. 2, thereby preventing rotation of the valve 8c. It is becoming more and more common.

A dustproof cap 20 is screwed into the valve 8c. This cap 20 has a dust-proofing function as well as a function as a locking screw for the nut member 8a.

Then, as shown by the arrow, the inflow air that enters the annular passage 14 from the air inlet 3 passes through a plurality of control ports 4 provided on the circumferential surface of the sleeve 5, and enters the inside of the sleeve 5 (not shown). The flow rate is controlled by driving the pulse motor 1.
That is, when a pulse signal is applied to the step motor 1, the drive shaft 6 rotates by the number of rotations corresponding to the pulse signal, and the drive male screw 7 tightens the nut member 8a.
The valve 8c and the dustproof cap 20, which are screwed together, move forward or backward by a predetermined amount (up and down in the drawings), and the opening area of the control port 4 is increased or increased by the front end surface 8e of the valve 8c. The intake air amount is thereby controlled.

In order to ensure accurate flow characteristics here, it is necessary to align the base points of the valve 8c and the control port 4 in advance. That is, when the valve 8c is at its lowest position in FIG. To make this adjustment, first remove the dustproof cap 20, then tighten the nut member 8a.
By turning the driver groove 8f, the valve 8c is slightly moved forward or backward (moved upward or downward in the drawing) to perform base point alignment.
Next, the dustproof cap 20 is screwed in and fixed. However, this adjustment means has a problem in that when the dustproof cap is screwed in, the nut member 8a also rotates, and the relative position of the valve 8c and the control port 4 changes even though the reference points have been aligned. It was hot.

Further, since threads are provided on the outer periphery of the nut member 8a and the inner periphery of the valve 8c, the sleeve 5
There was also the problem that it was difficult to obtain coaxiality of the valve 8c with respect to the valve 8c.

In addition, the dustproof cap must be removed before base alignment, and after the base alignment is completed, it must be reattached to lock the nut member 8a and valve 8c, which is troublesome and time consuming. There were also some problems.

The present invention was developed by focusing on these conventional problems, and solves the above problems by screwing the sleeve and the valve body together and providing a screwdriver groove on one end surface of the sleeve. The object of the present invention is to provide a flow control valve that can achieve the following.

The embodiment of the present invention will be described in detail below with reference to FIGS. 3 to 5, but the same parts between the structure of this embodiment and the structure shown in the conventional example will be They will be given the same reference numerals and their structural descriptions will be omitted.

First, to explain the configuration, a valve body 2 is fixed to a step motor 1, and a through hole 13 is provided in the center of the valve body 2 so as to communicate with an air inlet 3. A cylindrical sleeve 5 is fitted into the through hole 13, and the sleeve 5 is screwed onto the valve body 2 by a screw 15 provided on the outer periphery of one end of the sleeve. This sleeve 5 is provided with a plurality of control ports 4, and a driver groove 10 is provided at one end edge thereof.

A space provided in the center of the through hole 13 is partitioned by the sleeve 5 to form an annular passage 14.

A valve 8c is screwed into a drive male thread 7 formed on the drive shaft 6 of the step motor 1. The outer peripheral surface of the valve 8c is slidably fitted into the inner peripheral surface of the sleeve 5. A notch (flat part) 8d provided from the center to the end of the valve 8c
is in sliding contact with the inner flat surface 9a of the C-shaped member 9, thereby preventing the valve 8c from rotating. The C-shaped member 9 has an inner flat surface 9a with a protrusion 1a provided on the step motor base side.
The rotation of the valve 8c and the C-shaped member 9 is prevented by fitting the valve 8c to the C-shaped member 9 (the fourth
(see figure).

Next, the operation of this embodiment with the above configuration will be explained.

The incoming air flows through the air inlet 3 as shown by arrow a.
The liquid enters the annular passage 14 from there, passes through the plurality of control ports 4, enters the inside of the sleeve 5, and is then sucked into a surge tank or the like. Pulse motor 1 controls the flow rate.
This is done by driving the . That is, when a pulse signal is applied to the step motor 1, the drive shaft 6 rotates by the number of rotations corresponding to the pulse signal, and thereby the valve 8c moves forward or backward by a predetermined amount (moves up and down in the drawing), and the front end of the valve 8c moves forward or backward by a predetermined amount. The surface 8e reduces or increases the opening area of the control port 4,
This controls the amount of intake air.

In order to ensure accurate flow characteristics here, it is necessary to align the base points of the valve 8c and the control port 4 in advance. That is, when the valve 8c is at the lowest position in FIG. 3 (opposite position to that shown), the front end surface 8e of the valve 8c needs to be aligned with the lowest end surface 4a of the control port 4. To perform this adjustment, after attaching the valve body 2 to a flow rate tester (not shown), drive the step motor 1 to adjust the valve 8c.
is advanced to the lowest position in FIG. 3, and a driver (not shown) is inserted into the driver groove 10 and turned to determine the base point position. Once this adjustment is complete, pour adhesive into the threads to secure the position. You can also caulk instead of using adhesive. Although the above embodiment has been described as an air flow rate control valve, this flow rate control valve is not limited to air flow control valve, and can also be used to control liquid flow rate.

As described above, the present invention includes a step motor 1, a valve body 2 attached to the step motor 1 and provided with a fluid inlet 3, and a control port 4 facing the fluid inlet 3. A valve 8c is screwed into the sleeve 5 attached to the valve body 2 and the drive male screw 7 formed on the step motor drive shaft 6, and whose outer circumferential surface is slidable on the inner circumferential surface of the sleeve 5.
In the flow control valve, the sleeve 5 and the valve body 2 are screwed together 15 so as to align the base points of the valve 8c and the control port 4, and a driver groove 10 is provided on one end surface of the sleeve 5. According to this flow control valve, the reference points of the valve 8c and the control port 4 can be aligned in a flow rate test, that is, the position of the sleeve 5 can be adjusted accurately, reliably, and quickly. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional air flow control valve.
FIG. 2 is a perspective view of the sleeve and C-shaped member in FIG.
5 is a cross-sectional view taken along line A. FIG. 5 is a view taken along arrow B in FIG. 1...Step motor, 2...Valve body, 3...
Air inlet, 4... Control port, 5... Sleeve, 6
... Drive shaft, 7 ... Drive male screw, 8c ... Valve, 10 ... Groove for driver, 15 ... Screw.

Claims (1)

[Scope of utility model registration request] Step motor 1 and this step motor 1
a valve body 2 attached to the valve body 2 and provided with a fluid inlet 3; a sleeve 5 facing the fluid inlet 3 and provided with a control port 4 and attached to the valve body 2; In a flow control valve equipped with a valve 8c that is screwed into the drive male screw 7 and whose outer circumferential surface is slidable on the inner circumferential surface of the sleeve 5, the sleeve 5 and the valve body 2 are connected to the valve 8c and the control port 4. A flow control valve characterized in that a screw connection 15 is provided to enable base point alignment with the sleeve 5, and a driver groove 10 is provided in one end surface of the sleeve 5.