JPH04254073A - Flow regulating device - Google Patents

Abstract

PURPOSE:To prevent the fluctuation of a flow regulating position caused by factors such as vibration in a flow regulating device used for the fluid flow regulation of intake air quantity or the like in an internal combustion engine for an automobile. CONSTITUTION:A locking part 9 formed of constant pitch protrusions-recessions is formed on the outer peripheral side face of a guide 1. Locking protrusions 10 to be engaged with the locking part 9 are formed on the inner wall surface of a guide holding part 3d. Air is led in from a first fluid passage 3a and discharged from a second fluid passage 3b through a third fluid passage 3c. A fluid regulating part 1a is rotated in association with the rotation of the guide 1 so as to change the opening area of the third fluid passage 3c. Air flow is regulated by the opening area of the third fluid passage 3c. The rotational position of the air regulating part having regulated the air flow is positioned by the elastic locking between the locking part 9 of the guide 1 and the locking protrusion 10 of the guide holding part 3d.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate adjustment device used for adjusting the flow rate of fluid such as the amount of intake air in, for example, an internal combustion engine of an automobile.

0002

2. Description of the Related Art FIG. 6 is a sectional view showing a conventional flow rate regulating device. In the figure, 1 is a guide having a flow rate adjustment part 1a at one end, 2 is an O-ring that maintains the airtightness of the fluid air, 3 is a first fluid passage 3a for introducing air, and a second passage for discharging air. A nipple having a fluid passage 3b, a third circulation passage 3c connecting the first and second fluid passages 3a and 3b, and a guide holding part 3d for inserting and holding the guide 1; 4 is a core; 5 is a nipple on the outer circumference of the core 4; A wound coil, 6 is a plunger, 7 is a spring disposed between the core 4 and the plunger 6, and biases the plunger 6 to cause the plunger 6 to close the second fluid passage 3b. This is a terminal that supplies current to the coil 5.

Next, the operation of the conventional flow regulating device shown in FIG. 6 will be explained. The guide 1 has a guide holding part 3d
After being inserted into the guide holding part 3d, the end edge of the guide holding part 3d is heat-swaged, and the O-ring 2 maintains airtightness, and the heat-swaged part 3
e prevents it from coming off and is rotatably attached to the nipple 3. First, air flows through the first fluid passage 3
a and reaches the third fluid passage 3c. Here, current is supplied to the coil 5 through the terminal 8. When current flows through the coil 5, the core 4 is excited, and the plunger 6 is drawn toward the core 4 against the biasing force of the spring 7. By attracting the plunger 6 to the core 4, the second fluid passage 3b becomes open, and air flows into the second fluid passage 3b.
is discharged through the fluid passage 3b.

[0004] At this time, by rotating the guide 1, the flow rate adjustment part 1a is rotated to change the opening area of the third flow path 3c, thereby adjusting the flow rate of air. Here, the rotational position of the guide 1 with the adjusted air flow rate is fixed by the frictional force of the O-ring 2. Further, when the current supplied to the coil 5 by the terminal 8 is cut off, the plunger 6 is pushed back by the restoring force of the spring 7, and the second fluid passage 3b is closed. The opening and closing of the fluid passage is controlled by turning on and off the current by this terminal 8.

[0005]

[Problems to be Solved by the Invention] As described above, the conventional flow rate adjusting device maintains and fixes the rotational position of the guide 1, which adjusts the air flow rate, by the frictional force of the O-ring. There was a problem that the rotational position of the guide 1 changed. The first and second aspects of the present invention have been made to solve the above-mentioned problems, and their purpose is to obtain a flow rate adjusting device that can prevent fluctuations in the rotational position of the guide due to factors such as vibration. do.

[0006]

[Means for Solving the Problems] A flow rate regulating device according to a first aspect of the present invention is provided with a locking portion made of unevenness at a constant pitch on the outer circumferential side of a guide, and the locking portion is provided in a guide holding portion. It is provided with a locking protrusion that engages with the unevenness of the part. Moreover, the flow rate adjustment device according to the second invention of the present invention includes:
The inner circumferential surface of the guide holding part is provided with a locking part made of unevenness at a constant pitch, and the guide is provided with a locking protrusion that engages with the unevenness of the locking part.

[0007]

[Operation] In the first and second inventions of this invention,
When adjusting the flow rate of the fluid to a desired flow rate by changing the opening area of the third fluid passage by rotating the flow rate adjustment part, the flow rate adjustment rotational position of the flow rate adjustment part is adjusted between the unevenness of the locking part and the locking protrusion. Positioning can be done by elastic locking.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the flow rate adjustment device of the first invention, FIG. 2 is a plan view of the flow rate adjustment device shown in FIG. 1, and FIG. It is an enlarged perspective view of the main part for explaining the installation state of the guide in the flow rate adjustment device of the invention, and in the figure, the same or corresponding parts as the conventional flow rate adjustment device shown in FIG. Omitted. Reference numeral 9 denotes a locking portion formed of irregularities at a constant pitch provided on the outer circumferential side of the guide 1, and reference numeral 10 denotes a locking portion inside the guide holding portion 3d that faces the locking portion 9 when the guide 1 is inserted into the guide holding portion 3d. A locking projection 11 is provided on the wall surface and engages with the locking portion 9 to lock the guide 1. The locking projection 11 is provided at the upper end of the guide holding portion 3d and is connected to the small piece portion 12 on which the locking projection 10 is formed. This is a notch that separates the small piece 13 for caulking.

As shown in FIG. 4, the guide 1 has a locking portion 9.
After being inserted into the guide holding part 3d of the nipple 3 so that the locking protrusion 10 engages with the recess of the nipple, the edge of the small piece part 13 is heat caulked, and airtightness is maintained by the O-ring 2. The guide 1 is attached to the nipple 3 with the thermally caulked portion 3e preventing it from coming off, and the rotational position of the guide 1 being determined by the locking protrusion 10. Here, the guide 1 and nipple 3 are made of elastic resin such as plastic.

[0010] Here, in the flow rate adjusting device having the above configuration, since the locking protrusion 10 is formed on the small piece portion 12,
The small piece portion 12 can be displaced in the direction of the arrow as shown in FIG. 5 due to its elasticity in the radial direction. When the guide 1 is rotated, the convex portion of the locking portion 9 of the guide 1 pushes out the locking protrusion 10 in the radial direction, and the locking portion 9
In the recessed part, the locking protrusion 10 is held by the elasticity of the small piece 12.
is pushed back so as to engage with the concave portion of the locking portion 9, and the guide 1 can be digitally rotated in pitch units of the unevenness of the locking portion 9. Therefore, the adjusted position of the guide 1 where the air flow rate is adjusted is held by the elastic locking between the locking part 9 of the guide 1 and the locking protrusion 10 of the guide holding part 3d, and the adjustment of the air flow rate is It can be controlled in pitch units of the unevenness of the stop portion 9.

Next, in an embodiment of the first invention,
The description has been made by forming the locking part 9 made of unevenness at a constant pitch on the guide 1, and the locking protrusion 10 formed on the inner wall surface of the guide holding part 3d. A similar effect can be obtained in the second embodiment of the invention in which a locking portion consisting of an unevenness is formed and a locking protrusion that engages with the unevenness of the locking portion is formed on the guide 1.

[0012] In the embodiments according to the first and second inventions described above, a flow regulating device using a solenoid valve was described, but the present invention is not limited to this. Similar effects can be obtained even without a means for opening and closing the fluid passage.

[0013]

As described above, according to the first and second inventions, the rotational position of the guide is determined by the elastic locking between the locking portion and the locking protrusion, which are made of irregularities with a constant pitch. Therefore, it is possible to obtain a flow rate adjusting device that can maintain a predetermined adjusted flow rate without fluctuations in the rotational position of the guide due to factors such as vibration.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a flow rate regulating device according to a first aspect of the present invention.

FIG. 2 is a plan view of the flow rate regulating device of the first invention shown in FIG. 1;

FIG. 3 is a perspective view of a main part of the flow rate adjusting device of the first invention shown in FIG. 1, illustrating a state in which a guide is attached.

FIG. 4 is an enlarged plan view of a main part of the flow rate adjusting device of the first invention shown in FIG. 1, illustrating a state in which a guide is attached.

FIG. 5 is a cross-sectional view for explaining the rotational movement of the guide in the fluid regulating device of the present invention.

FIG. 6 is a sectional view showing an example of a conventional flow rate adjustment device.

[Explanation of symbols]

1 Guide 1a Flow rate adjustment part 3 Nipple 3a First fluid passage 3b Second fluid passage 3c Third fluid passage 3d Guide holding part 9 Locking part 10 Locking protrusion

Claims (2)

[Claims] 1. A first fluid passage for introducing a fluid, a second fluid passage for discharging the fluid, a third fluid passage for connecting the first and second fluid passages, and a third fluid passage for connecting the first and second fluid passages; In the flow rate adjustment device, the guide includes a guide that changes the opening area of the third fluid passage by rotation of a flow rate adjustment unit provided therein, and a guide holding unit that rotatably holds the guide. A locking portion consisting of unevenness at a constant pitch is formed on the side surface, and a locking protrusion that engages with the unevenness of the locking portion is formed on the guide holding portion, and the flow rate adjustment position of the fluid adjustment portion of the guide is formed. The flow rate adjusting device is characterized in that the position is determined by elastic locking between the locking portion and the locking protrusion. 2. A first fluid passage for introducing a fluid, a second fluid passage for discharging the fluid, a third fluid passage for connecting the first and second fluid passages, and a third fluid passage for connecting the first and second fluid passages; A flow rate adjustment device including a guide that changes the opening area of the third fluid passage by rotation of a flow rate adjustment unit provided therein, and a guide holding unit that rotatably holds the guide, the guide holding unit including: A locking part made of unevenness with a constant pitch is formed on the inner circumferential surface thereof, and a locking protrusion that engages with the unevenness of the locking part is formed on the guide, and a flow rate adjustment part of the fluid adjustment part of the guide is formed. A flow rate adjusting device, characterized in that the position is determined by elastic locking between the locking portion and the locking protrusion.