JPS608150Y2 - Diaphragm pressure response device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a diaphragm pressure responsive device.

Traditionally, diaphragm-type pressure-responsive devices with a single diaphragm have been widely used, but recently devices with two diaphragms have come into use as ignition timing control devices for automobile gasoline engines. It's here.

The known diaphragm pressure-responsive device shown in Fig. 1 was also developed for use as an ignition timing control device for gasoline engines, but this diaphragm-type pressure-responsive device has the following problems, so it was difficult to improve it. It needed to be resolved.

The structure and problems of a known diaphragm pressure response device will be explained below with reference to FIGS. 1 and 2.

In FIG. 1, two annular diaphragms 2 and 3 are provided within a cylindrical casing 1, with their outer peripheral edges fixed to the casing 1 and separated from each other.

Negative pressure introduction pipes (not shown) are opened in the chamber 4 between the diaphragms 2 and 3 and the chamber 5 between the diaphragm 3 and the end plate of the casing 1, and the pressure introduced into these chambers 4 and 5 is opened. Depending on the size of the diaphragm 2, 3, each diaphragm 2, 3 can be displaced parallel to the axis of the casing 1.

A non-flexible annular plate 6 is attached to the center of the diaphragm 2, and this plate 6 has a hole that corresponds to the center hole of the diaphragm 2.

In the center of the diaphragm 3 are non-flexible annular plates 7, 8.
is attached, and a stepped cylindrical boss portion 9 is inserted through the center holes of the plates 7 and 8 and the center hole of the diaphragm 3, and the boss portion 9 is attached to the plate 7 by bolts or the like at its own flange 91. , 8 and the diaphragm 3.

This boss portion 9 constitutes the central member of the diaphragm 3 and also serves as a spring seat, and also serves as an engaging portion with a connecting member to be described later.

An annular counterbore is provided on the inner peripheral side of the flange 91 of the boss portion 9, and an annular stop plate 92 is fastened to the counterbore by bolts or the like.

This stop plate 92 is for engaging with the end of a connecting member to be described later to maintain engagement between the connecting member and the boss portion 9, and has a center portion larger than the shaft portion of the connecting member. It has a hole of the same diameter.

The connecting member 10 connects the center portions of the diaphragms 2 and 3, is arranged in the chamber 4, and has a cylindrical portion 101 with a screw hole at one end and a disc-shaped portion 102 at the other end.
It further has a shaft portion 103 that connects the cylindrical portion 101 and the disc-shaped portion 102.

The screw hole in the cylindrical portion 101 is for screwing in the male screw of the operating rod, which will be explained later.

Further, the disk-shaped portion 102 has an outer diameter smaller than the inner diameter of the boss portion 9, and one end surface of the disk-shaped portion 102 is adapted to be surface-engaged with the stop plate 92.

The outer diameter of the shaft portion 103 is smaller than the diameter of the center hole of the stop plate 92, so the disk-shaped portion 102 is inserted into the boss portion 9 and the connecting member 10 is closed by the stop plate 92 as shown in FIG.
In a state where the engagement between the boss portion 9 and the boss portion 9 is maintained, the connecting member 10 is connected to the boss portion 9 with a slight degree of freedom in the radial direction.

A hole is provided in the center of the left end plate of the casing 1, and a cylindrical member 11 is fitted into this hole.
An operating rod 12 is inserted into the casing 1 through the inside of the casing 1.

A male threaded portion 121 is provided at the tip of the operating rod 12, and a presser flange 122 is provided adjacent to the male threaded portion 121.

The male threaded portion 121 is fitted into the cylindrical portion 101 of the connecting member 10 through the center hole of the diaphragm 2 and the hole of the plate 6,
The holding flange 122 pinches the diaphragm 2 and the plate 6 between it and the end surface of the cylindrical portion 101 of the connecting member 10.

Therefore, the diaphragm 2 and the connecting member 10 are connected with no relative degrees of freedom in the radial and axial directions.

A coil spring 13 is provided in the chamber 4 surrounding the connecting member 10, one end of the coil spring 13 is pressed against the plate 6, and the other end is pressed against a stop plate 92 integral with the boss portion 9.

On the other hand, a coil spring 14 is also provided in the chamber 5, one end of the coil spring 14 is supported by a cylindrical spring receiver 15 attached to a part of the casing 1, and the other end is pressed against the boss portion 9.

In the known diaphragm pressure response device having the above structure, when frequent and rapid pressure fluctuations occur in the chambers 4 and 5, the axis O perpendicular to the casing axis X as shown in FIG. There was a tendency for the diaphragms 2, 3 and the members fixed thereto to undergo rocking S around the diaphragms 2, 3, or for lateral vibration Y in the radial direction with respect to the casing axis X to occur.

For this reason, the operating rod 12 may oscillate laterally, and the operating rod 12 may not be able to move in the axial direction accurately in response to pressure fluctuations, and further, the diaphragm 3 and the plate members 7, 8 may move due to the rocking S and lateral vibration Y. A problem has arisen in that the diaphragm 3 is worn away by the plate members 7 and 8 due to relative movement between the two.

As a result of investigating the causes of the above-mentioned problem, the inventors of the present invention found that it is necessary to provide a device to prevent lateral vibration of the diaphragm 3, to provide a degree of freedom in the radial direction to the connecting portion between the diaphragm 2 and the connecting member 10, and to use a coil spring. It has been found that the above problem can be solved by various means such as removing 13.

FIG. 3 is a longitudinal cross-sectional view of the diaphragm type pressure response device of the present invention constructed based on the above-mentioned idea.

In addition, in FIG. 3, parts that are substantially the same as those shown in FIG. 1 are indicated by the same reference numerals as those in FIG. do.

In the diaphragm pressure-responsive device of the present invention shown in FIG. 3, the inner diameter of the diaphragm 3 is larger than that of the device shown in FIG. 6. 7. Central member 16.17 different from 8.
are attached, and a connecting member 18, which is different from the connecting member 10 in FIG. 1, is connected to these central members 16, 17.

Further, a cylindrical guide portion 19 is provided integrally with the casing 1 to prevent the central member 17 from wobbling laterally, and a protrusion 11 is provided on the inner peripheral surface of the cylindrical member 11 to prevent the operating rod 12 from wobbling laterally. ' is provided.

The structural features, functions, purposes, etc. of each of the above-mentioned parts will be explained below.

A central member 16 attached to the central portion of the diaphragm 2
has a cylindrical portion 161 protruding toward the diaphragm 3,
A hole 163 is provided in the end surface portion 162 of the cylindrical portion 161 .

On the other hand, the center member 17 attached to the center part of the diaphragm 3 has a cylindrical part 171 concentric with the casing 1, and has presser flanges 172, 173 provided along the outer periphery of the cylindrical part 171. The inner peripheral edge of the diaphragm 3 is held between the flanges 172 and 173.

Further, a gripping portion 174 for gripping one end of the connecting member 18 is provided at the center of the cylindrical portion 171.
A boss portion 175 connected to 74 is formed.

The peripheral edge of the boss portion 175 serves as a seat for the coil spring 14 housed in the chamber 5, and the other end of the coil spring 14 is pressed against the outer peripheral edge of the boss 20 formed on the inner end surface of the casing 1. ing.

A part of the casing 1 is bent in the radial direction into the casing 1 and then further bent toward the inside of the cylindrical part 171, forming a cylindrical guide part 19 concentric with the cylindrical part 171. are doing.

This guide portion 19 is for preventing the radial movement of the cylindrical portion 171, thereby suppressing the radial movement of the diaphragm 3 and the central member 17.

The connecting member 18 has a shaft portion 181 having a smaller diameter than the hole 163 of the cylindrical portion 161, and is provided with disk-shaped connecting portions 182 and 183 at both ends of the shaft portion 181.

The connecting portion 182 has an outer diameter considerably smaller than the inner diameter of the cylindrical portion 161 and is housed within the cylindrical portion 161, and the connecting portion 183 is held by the gripping portion 174 of the central member 17. .

Therefore, the connecting portion 182 has a degree of freedom of relative movement in the axial direction and the radial direction within the cylindrical portion 161, but the connecting portion 183 has no degree of freedom of relative movement with respect to the central member 17. As a result, even if radial movement, rocking, or axial vibration occurs in the diaphragm 3, this is not transmitted to the diaphragm 2 and the operating rod 12.

Moreover, the radial movement and axial vibration generated in the diaphragm 3 do not adversely affect the diaphragm 3.

(Note that 21 and 22 are pressure introduction pipes for introducing pressure into the chambers 4 and 5.

) In the pressure-responsive device of the present invention having the structure as described above, as described above, (1) a device (guiding portion 19) for preventing lateral vibration of the diaphragm 3 is provided; (11) the diaphragm 2 The coupling part between the connecting member 18 and the coupling member 18 is provided with a degree of freedom for relative movement in the radial and axial directions (■ Elimination of the coil spring 13, which tends to cause resonance (■ Prevents lateral vibration of the operating rod 12) By providing various measures such as providing a protrusion 11' inside the cylindrical member, the diaphragm is prevented from lateral vibration, rocking, and minute vibrations in the axial direction. Directional movement can be imparted to the operation and diaphragm wear can also be prevented.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional diaphragm pressure-responsive device, Fig. 2 is an explanatory diagram for explaining the problems that occur in the device shown in Fig. 1, and Fig. 3 is a diagram of a diaphragm-type pressure-responsive device according to the present invention. FIG. 1... Casing, 2, 3... Diaphragm, 11... Cylindrical member, 12...
Operating rod, 14... Coil spring, 16.17...
...Central member, 18...Connection member.

Claims (1)

[Claims for Utility Model Registration] A cylindrical casing 1, annular first and second diaphragms 2, 3 spaced apart within the casing 1 and having their outer peripheral edges fixed to the casing 1, A first center member 16 attached to the center of the first diaphragm 2, a second center member 17 attached to the center of the second diaphragm 3, and a space between the first and second diaphragms. a connecting member 18 that extends and has one end connected to the first central member 16 and the other end connected to the second central member 17; and a connecting member 18 that is inserted into the casing 1 from one end of the casing 1. an operating rod 12 connected to the first central member 16 and the first diaphragm 2;
The operating rod 12 is attached to one end surface of the casing 1.
a cylindrical member 11 having a hole through which the cylindrical member 11 is inserted; a coil spring 14 housed in the casing 1 and biasing the second center member 17 toward the first center member 16; The second central member 17 has a portion 17 parallel to the axis of the casing and the central axis of the second diaphragm 3.
1, a part of the casing 1 is close to the part 171 and constitutes a guide part 19 parallel to the axis of the casing, and the first central member 16 and the connecting member 18 are connected to the first part 171. A diaphragm-type pressure response device in which a diaphragm type pressure response device is connected by a connection structure that allows relative movement in the radial direction of one diaphragm 2 and relative movement in the axial direction of the casing.