JPH05332471A - Flow rate controller - Google Patents

Abstract

PURPOSE:To reduce the quantity of parts, simplify the assembly manhour, and reduce cost by integrally forming a valve itself and a bearing, by applying the bearing function to the valve itself, as for a flow rate metering valve for measuring the flow rate by varying the opening area through the shift in the axial direction. CONSTITUTION:When the control valve seat 11 of a plunger part is separated from the control valve 8 of a diaphragm mechanism. The pressure in a diaphragm chamber 18 formed between a solenoid 14 and the diaphragm 3 lowers, and the diaphragm mechanism shifts leftward. When the control valve seat 11 closes the control valve 8, the atmospheric pressure is introduced from a leak orifice 7, and the pressure in the diaphragm chamber 18 rises, and the diaphragm mechanism is shifted rightward by the differential pressure between before and behind the valve 2. In this case, the plate shaped part 2a set along the air stream direction is integrally formed on the valve 2, and the outside diameter is made smaller than the inside diameter of the control valve seat 11, and is made longer in the axial direction. The plate shaped part 2a is allowed to act as a bearing for restraining the shift in the radial direction of the valve 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling an idle speed of an automobile engine.

[0002]

2. Description of the Related Art A conventional apparatus is Japanese Patent Application No. 61-88009 (U.S. Pat.
It had the structure described in SA Patent 4823750).

[0003]

In the conventional idle rotation control device, the flow rate measuring valve and the bearing are separate components, which increases the number of parts and complicates the assembly process, resulting in high cost.

[0004]

In order to solve the above-mentioned problems, a bearing portion is provided in a part of an air flow rate measuring valve provided in a part of a diaphragm mechanism member, and functions are integrated to solve the problems. .

[0005]

By providing the valve element with a bearing function, the conventional bearing can be eliminated. Therefore, it is possible to reduce the number of parts and the number of assembly steps.

[0006]

EXAMPLES Examples of the present invention will be shown below.

The diaphragm mechanism 1 is a valve 2, a hollow shaft 3, a diaphragm 4, a leak orifice 7 provided in two plates 5, 6 sandwiching the inner circumference of the diaphragm 4, and a control provided in the shaft 3. It consists of valve 8. The plunger part includes a plunger 9, a plunger shaft 10, a control valve seat 11, a valve stopper 12 that stops the control valve seat, and a spring 1 that presses the control valve seat.
It consists of three. The plunger portion moves in the solenoid 14 and has a function of uniquely determining the position of the plunger portion with respect to the electric input by the balance between the magnetic attraction force generated in response to the electric input of the solenoid 14 and the force of the springs 15 and 19. Have The diaphragm mechanism 1 is placed in the body 16, and the outer periphery of the diaphragm 4 is connected to the solenoid 14 and the body 16.
It is sandwiched and fixed, and can be moved left and right in the drawing by being supported by a bearing provided in the valve 2 within a range allowed by the diaphragm. The seat 17 provided in the inner diameter of the body 16 and the valve The relative amount of 2 controls the amount of ventilation of the passage that bypasses the upstream and downstream of the engine throttle valve.

The operation is performed by the control valve seat 11 of the plunger section.
Is separated from the control valve 8, the pressure in the diaphragm chamber 18 formed between the solenoid 14 and the diaphragm 4 is reduced, a force on the left side in the figure is generated in the diaphragm 4, and the diaphragm mechanism moves to the left side in the figure. When the control valve seat 11 closes the control valve 8, the atmospheric pressure is introduced from the leak orifice 7, the pressure in the diaphragm chamber 18 rises, the differential pressure across the diaphragm 4 disappears, and the differential pressure across the valve 2 causes the diaphragm mechanism to operate. Move to the right in the figure. The position of the diaphragm mechanism 1 follows the position of the control valve seat 11 by balancing these opposing forces. FIG. 1 shows an embodiment of the idle rotation control device of this structure in which the valve 2 has a bearing function.

An enlarged view of an example in which the valve 2 is provided with a bearing function is shown in FIG. The outer diameter of the plate-shaped portion 2a formed integrally with the valve 2 along the air flow direction is slightly smaller than the inner diameter of the control valve seat 11, and is provided axially longer than the movable range of the valve 2. It functions as a bearing that can always restrain the radial movement of the valve 2 with respect to the movement of 2.

[0010]

According to the present invention, the number of parts can be reduced,
Therefore, the product can be supplied at low cost.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

1 ... Diaphragm mechanism, 2 ... Valve, 3 ... Shaft, 4
... diaphragm, 5, 6 ... plate, 7 ... leak orifice, 8 ... control valve, 9 ... plunger, 10 ... plunger shaft, 11 ... control valve seat, 12 ... valve stopper, 13, 15, 19 ... spring, 14 ... solenoid , 16 ... Body, 17 ... Seat, 18 ... Diaphragm chamber.

Claims (6)

[Claims] 1. A flow rate control valve, wherein a flow rate control valve itself has a bearing function in a flow rate control valve which changes an opening area by axial movement to measure a flow rate. 2. The flow control device according to claim 1, wherein the flow metering valve is operated by a solenoid mechanism driven by an electric input. 3. A flow rate control device according to claim 2, wherein the flow rate control device is used for flow rate control through a bypass passage connecting the upstream and downstream of a throttle valve of an internal combustion engine. 4. A flow rate control device according to claim 2, wherein the flow rate control device is used in a passage connecting an intake pipe of an internal combustion engine and a fuel vapor collection device. 5. An idle rotation control device provided with a servo mechanism which combines a diaphragm mechanism and a solenoid mechanism and causes the operation of the diaphragm mechanism to follow the movement of the plunger of the solenoid mechanism driven by an electric input. An idle rotation control device, wherein an air flow metering valve provided in a part of the mechanism has a bearing function. 6. An idle rotation control device, wherein the air flow metering valve according to claim 5 is made of resin.