JP5369037B2 - Diaphragm - Google Patents

Abstract

Disclosed is a diaphragm having a flexible film portion and an outer peripheral flange portion integrally provided on the peripheral edge of the film portion, said outer peripheral flange portion being provided between and held by a first housing and a second housing, wherein the film portion is prevented from rising upward when the diaphragm is attached to the housings. The outer peripheral flange portion has a first pressed surface which is one surface of the diaphragm in the thickness direction and which is in close contact with the first housing, and a three-dimensional shape composed of a projected portion or a recessed portion, on the first pressed surface. When the outer peripheral flange portion is attached to the first housing and the second housing while being compressed and deformed therebetween, the three-dimensional shape defines voids in the thickness direction between the outer peripheral flange portion and the first housing.

Description

  The present invention relates to a diaphragm, and more particularly to a diaphragm suitable for use in an accumulator or the like of a vehicle hydraulic pressure control device.

  Conventionally, as shown in FIG. 5, a diaphragm 1 made of a rubber-like elastic body having a membrane portion 2 that is flexibly deformed and an outer peripheral flange portion 3 that is integrally provided at the peripheral portion of the membrane portion 2 is known. The diaphragm 1 is used, for example, in an accumulator of a vehicle hydraulic pressure control device and is attached to a pressure chamber 32 in a housing 31. The membrane portion 2 is flexibly deformed by the action of pressure, and the volume of the pressure chamber 32 is increased. And the air vent 33 is opened and closed.

  In the diaphragm 1 having the above outline, as shown in FIG. 6A, a diaphragm of the type in which one surface 2a in the thickness direction of the film portion 2 and one end surface 3a in the thickness direction of the outer peripheral flange portion 3 are arranged on the same plane. As shown in FIG. 6B, the diaphragm 1 is mounted by sandwiching the outer peripheral flange portion 3 between a pair of upper and lower housings 31A and 31B. At this time, the membrane portion 2 is in its initial motion posture. One surface 2a is brought into contact with the flat surface portion 35 of the housing 31A on the upper and lower sides of the figure in which the vent hole 33 is provided.

  However, according to the diaphragm 1 shown in FIGS. 6A and 6B, the outer peripheral flange portion 3 is greatly compressed and deformed when mounted between the pair of housings 31A and 31B. As shown in (C), one surface 2a of the film part 2 may float away from the flat part 35 of the lower housing 31A. In such a case, the film part 2 is prevented from being lifted accurately. It is necessary to secure the initial movement posture.

Japanese Patent Laying-Open No. 2007-269298 (FIG. 18)

  In view of the above, an object of the present invention is to provide a diaphragm capable of suppressing the occurrence of a floating phenomenon in a film portion when the diaphragm is mounted on a housing.

To achieve the above object, a diaphragm according to claim 1 of the present invention is a diaphragm having a film unit for flexible deformation, and an outer peripheral flange portion provided integrally with the periphery of the membrane portion, said membrane At least a portion of one surface in the thickness direction of the portion and at least a portion of one end surface in the thickness direction of the outer peripheral flange portion are disposed on the same plane and have a flat surface, The other end surface in the thickness direction protrudes in the thickness direction from the other surface in the thickness direction of the film portion, and when the diaphragm is mounted between a pair of the first housing and the second housing, the outer peripheral flange portion is A state in which the film portion is compressed in the thickness direction between a pair of the first housing and the second housing, and one side in the thickness direction of the film portion is in contact with the first housing over substantially the entire surface. In the diaphragm is, the outer peripheral flange portion has a first pressed surface is a surface to be pressed against the first housing with an end in the thickness direction while the convex portion on the first pressed surface or provided three-dimensional shape consisting of the concave portion, wherein the three-dimensional shape in a state where the outer peripheral flange portion is compressed in the thickness direction between the pair of first housing and second Haujin grayed between the outer peripheral flange portion and said first Haujin grayed Forming a gap in the thickness direction and absorbing the compressive deformation of the outer peripheral flange portion by the gap in the thickness direction so that the influence of the compressive deformation does not easily reach the film portion, and the film portion is lifted from the first housing. It is characterized by suppressing .

  The diaphragm of the present invention has a membrane portion that is flexibly deformed, and an outer peripheral flange portion that is integrally provided on a peripheral portion of the membrane portion, and the outer peripheral flange portion is between the pair of first housing and second housing. For example, when used in an accumulator of a hydraulic control device for a vehicle, the state in which the membrane portion is seated on the first housing is the initial motion posture, and the space between the first housing and the diaphragm When a differential pressure is generated between the space and the space between the diaphragm and the second housing, the membrane portion operates so as to be separated from the first housing. The thickness direction gap can be easily formed between the outer peripheral flange portion and the first housing simply by giving the pressed surface a three-dimensional shape, and the first housing and the second half of the outer peripheral flange portion are formed by the thickness direction gap. By absorbing deformation due to compression from the ging, in a state in which the diaphragm is mounted between the first housing and the second housing, that is, in an initial motion posture in which the above-described differential pressure is not generated, the film portion due to the influence of the deformation The floating from the first housing can be suppressed.

  The diaphragm according to claim 2 of the present invention is the diaphragm according to claim 1, wherein the three-dimensional shape is an annular protrusion provided at a radially central portion of the first pressed surface, and the outer periphery. The thickness direction gap is formed radially outward from the annular protrusion of the first pressed surface in a state where the flange portion is compressed and deformed between the first housing and the second housing. And

  According to the configuration of the second aspect, by forming the thickness direction gap radially outside the annular protrusion of the first pressed surface by the annular protrusion, the volume of the thickness direction gap can be sufficiently secured, and the outer periphery The deformation due to compression of the flange portion from the first housing and the second housing can be absorbed more easily.

  The diaphragm according to claim 3 of the present invention is the diaphragm according to claim 1 or 2, wherein the outer peripheral flange portion is mounted between the first housing and the second housing. The outer diameter dimension is set so that a radial gap can be formed in the radial direction of the diaphragm between the outer peripheral surface of the outer peripheral flange portion and at least one of the first and second housings.

  According to the configuration of the third aspect, the radial gap makes it easier to absorb deformation due to compression of the outer peripheral flange portion from the first housing and the second housing.

  A diaphragm according to a fourth aspect of the present invention is the diaphragm according to any one of the first to third aspects, wherein the outer peripheral flange portion is the other surface in the thickness direction of the diaphragm, and the second housing. It has the 2nd to-be-pressed surface pressed, and the solid shape which consists of a convex part or a recessed part in this 2nd to-be-pressed surface.

  According to the configuration of claim 4, it is possible to easily form a thickness direction gap between the outer peripheral flange portion and the second housing simply by giving the second pressed surface a three-dimensional shape. Absorption of deformation due to compression from the first and second housings of the flange portion becomes easier.

  Furthermore, the diaphragm support structure according to claim 5 of the present invention is a diaphragm support structure in which a diaphragm is sandwiched between a first housing and a second housing, and the diaphragm is any one of claims 1 to 4. It is characterized by having a diaphragm.

  According to the configuration of the fifth aspect, in the diaphragm support structure, the diaphragm according to any one of the first to fourth aspects can suppress the rising of the film portion from the first housing.

  The present invention has the following effects.

  That is, in the present invention, as described above, since a gap in the thickness direction and the radial direction is set around the outer peripheral flange portion to secure a clearance for the rubber-like elastic body when the flange is deformed, the outer peripheral flange portion is not deformed. It is absorbed by this escape place, and the influence of deformation does not easily reach the inner peripheral side film portion. Therefore, it is possible to suppress the occurrence of the floating phenomenon in the film portion and to ensure the accurate initial movement posture.

It is a figure which shows the diaphragm which concerns on the Example of this invention, (A) is a half-cut sectional view in the state before the mounting | wearing, (B) is a principal part enlarged view of (A). It is a figure which shows the same diaphragm, (A) is a half cut sectional view in the mounting state, (B) is a principal part enlarged view of (A). It is a figure which shows the diaphragm which concerns on the other Example of this invention, (A) is a half-cut sectional view in the state before the mounting | wearing, (B) is a principal part enlarged view of (A). It is a figure which shows the same diaphragm, (A) is a half cut sectional view in the mounting state, (B) is a principal part enlarged view of (A). Sectional drawing which shows the mounting state of the diaphragm which concerns on a prior art example It is a figure which shows the diaphragm which concerns on a comparative example, (A) is a half cut sectional view in the state before the mounting | wearing, (B) is a half cut sectional view in the mounting state, (C) is a half cut sectional view in the malfunction occurrence state

  Next, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the diaphragm 1 according to this embodiment is formed into a disk shape by a predetermined rubber-like elastic body, and is flexibly deformable with a film part 2 and a peripheral part of the film part 2. An annular outer peripheral flange portion (outer peripheral attachment portion) 3 is integrally provided. The diaphragm 1 according to this embodiment is used for an accumulator of a vehicle hydraulic pressure control device that performs ABS control, ESC control, etc., and an outer peripheral flange portion 3 is located between a pair of upper and lower housings 31A and 31B in the figure. By being sandwiched, the pressure chambers 32 (see FIG. 2) in the housings 31A and 31B are mounted. The lower housing 31A in FIG. 1 is provided with a vent hole 33, and the upper housing 31B is provided with a communication hole 39 that communicates with, for example, a hydraulic fluid passage of the vehicle hydraulic device.

  As a detailed structure of the diaphragm 1, the film part 2 is formed into a flat plate shape having a uniform thickness over the entire surface (except for the case where a thick part 4 described later is provided), and provided with a vent hole 33. It has one surface 2a facing one housing (first housing) 31A and the other surface 2b on the opposite side. The outer peripheral flange portion 3 is set to have a thickness larger than that of the membrane portion 2 and is formed in a substantially rectangular cross section. One end surface in the thickness direction is a pressed surface (first surface) with respect to one housing 31A provided with the vent hole 33. 1 pressed surface) 3a, and the other end surface is a pressed surface (second pressed surface) 3b pressed by the other housing (second housing) 31B. The first pressed surface 3a and the one surface 2a of the film part 2 are arranged on the same plane to form a flat surface. The second pressed surface 3b protrudes in the thickness direction from the other surface 2b of the film part 2.

  In order to prevent the membrane portion 2 from interfering with the vent hole 33 when the diaphragm 1 is operated (the membrane portion 2 bites into the vent hole 33), a dent 5 is formed in the distal end surface 4a at the center of the plane of the membrane portion 2. The thick portion 4 provided is integrally molded, and a recess 34 into which the thick portion 4 is fitted is provided on the peripheral edge portion of the vent hole 33 in one housing 31A. Since the thick part 4 and the recessed part 34 are not essential structures, they do not need to be provided.

  One housing 31A provided with the vent hole 33 is provided with a flat portion 35 on which one surface 2a of the membrane portion 2 is in contact with substantially the entire surface. An annular mounting portion 36 (see FIG. 2) for mounting the outer peripheral flange portion 3 of the diaphragm 1 is provided between the pair of housings 31A and 31B. For this reason, one housing 31A has an annular stepped portion 37. Is provided to form an outer peripheral wall 36a of the mounting portion 36, and the other housing 31B is provided with an annular stopper portion 38 having a protruding shape to form an inner peripheral wall 36b of the mounting portion 36.

  The dimension c in the thickness direction of the mounting portion 36 (see FIG. 2) is set smaller than the dimension d in the thickness direction in the free state of the outer peripheral flange portion 3 (see FIG. 1) (c <d). A dimension φe (see FIG. 2) in the width direction (radial direction) of the mounting portion 36 is set to be larger than a dimension φf (see FIG. 1) in the width direction in the free state of the outer peripheral flange portion 3 (φe> φf). . The distance g (see FIG. 2) between the flat surface portion 35 of one housing 31A and the stopper portion 38 of the other housing 31B is the same as the thickness dimension h (see FIG. 1) of the membrane portion 2, or It is set slightly larger than the thickness dimension h (g ≧ h).

  When the diaphragm 1 is mounted between the pair of housings 31A and 31B on the assumption of the above matters, the membrane portion 2 is in contact with the flat portion 35 of one housing 31A with its one surface 2a as shown in FIG. Becomes the initial motion posture, and when the pressure is applied to the diaphragm 1 in the initial motion posture, the membrane portion 2 is separated from the flat portion 35 of the housing 31A. As shown in FIGS. 1 to 2, the outer peripheral flange portion 3 is compressed and deformed when mounted between the housings 31A and 31B. Even if the outer peripheral flange portion 3 is compressed and deformed in this way, the film portion 2 is compressed. Is supposed to be in a state where it should be kept in contact with the flat portion 35 of the housing 31A. However, as described above, depending on the cross-sectional shape of the diaphragm 1, as shown in FIG. 6C, the membrane portion 2 is already in the housing 31A in the initial motion posture in which only the outer peripheral flange portion 3 is attached to the housings 31A and 31B. In some cases, it may be necessary to take measures against this situation.

  Therefore, the inventors of the present application have come to make the present invention, and accordingly, the following embodiments are proposed.

  That is, as shown in FIG. 1, in the diaphragm 1 according to this embodiment, a part of the solid shape 7 on the plane is provided on the first pressed surface 3a of the outer peripheral flange portion 3, and this solid shape 7 is shown in FIG. As shown in the drawing, when the outer peripheral flange portion 3 is mounted between the housings 31A and 31B and is compressed and deformed, the outer peripheral flange portion is prevented from being lifted up in the film portion 2 due to the deformation of the outer peripheral flange portion 3. A thickness direction gap 8 (shown in FIG. 2) is set between 3 and one housing 31A as a clearance space when the flange is deformed.

  Specifically, the three-dimensional shape 7 is provided as a protrusion 9 provided in the central portion in the radial direction of the first pressed surface 3a. By providing such a protrusion 9, the three-dimensional shape 7 is provided on the outer peripheral side of the protrusion 9 in the mounted state. Thus, a thickness direction gap 8 is set between the first pressed surface 3 a of the outer peripheral flange portion 3 and the bottom surface 36 c of the housing mounting portion 36. The protrusion 9 is formed in an arc shape in a cross section taken along a plane including the central axis of the diaphragm 1 shown in FIG. 1, and extends over the entire circumference of the first pressed surface 3a in a plan view seen from below in FIG. However, the shape in plan view is not limited to an annular shape, and if there is no problem in sealing performance, a plurality of protrusions are not annular but a plurality of protrusions are arranged in the circumferential direction on the first pressed surface 3a. It may be arranged side by side.

  The outer peripheral flange portion 3 has a radial gap between the outer peripheral surface 3c of the outer peripheral flange portion 3 and the outer peripheral wall 36a of the housing mounting portion 36 when the outer peripheral flange portion 3 is mounted between the housings 31A and 31B. 10 (shown in FIG. 2) is set to an outer diameter dimension capable of forming. A protrusion (not shown) may be provided on a part of the outer peripheral surface 3 c of the outer peripheral flange portion 3, and the protrusion may be in contact with the outer peripheral wall 36 a of the housing mounting portion 36.

  Further, the second pressed surface 3b of the outer peripheral flange portion 3 may be a flat surface, but in this embodiment, the second pressed surface 3b is also provided with a part of the three-dimensional shape 11 on the plane. Specifically, the three-dimensional shape 11 is provided as a projection 12 at the radial center of the second pressed surface 3b, and by providing such a projection 12, as shown in FIG. The thickness direction gap 13 is set between the second pressed surface 3 b of the outer peripheral flange portion 3 and the bottom surface 36 d on the opposite side of the housing mounting portion 36. The protrusion 12 is formed in an arc shape in a cross section cut by a plane including the central axis of the diaphragm 1 shown in FIG. 1 like the protrusion 9, and the second pressed surface 3b in a plan view seen from above and below in FIG. The shape in plan view is not limited to an annular shape, and a plurality of protrusions are arranged on the circumference instead of being annular if there is no problem in sealing performance. It may be a structure.

  According to the diaphragm 1 having the above-described configuration, a part of the three-dimensional shape 7 on the plane, that is, the protrusion 9 is provided on the first pressed surface 3 a of the outer peripheral flange portion 3, whereby the outer peripheral flange portion 3 is on the outer peripheral side of the protrusion 9. A thickness direction gap 8 is formed between the first pressed surface 3 a and the bottom surface 36 c of the housing mounting portion 36. The thickness direction gap 8 has a size that absorbs elastic deformation of the outer peripheral flange portion 3 due to compression in the vertical direction shown in FIGS. 1 and 2 when the diaphragm 1 is mounted between the first housing 31A and the second housing 31B. It has become. Therefore, even if the outer peripheral flange portion 3 is compressed and deformed, the influence of the outer peripheral flange portion 3 does not easily reach the film portion 2, so that the floating phenomenon as shown in FIG. The thickness direction gap 8 may be provided not only on the outer peripheral side of the protrusion 9 but also on the inner peripheral side.

  In the embodiment, the radial gap 10 is formed between the outer peripheral surface 3 c of the outer peripheral flange portion 3 and the outer peripheral wall 36 a of the housing mounting portion 36. The radial gap 10 absorbs part of the elastic deformation of the outer peripheral flange portion 3 due to the vertical compression shown in FIGS. 1 and 2 when the diaphragm 1 is mounted between the first housing 31A and the second housing 31B. doing. When combined with the thickness direction gap 8, the gap that absorbs elastic deformation of the outer peripheral flange portion 3 can be further expanded, and the occurrence of lifting of the film portion 2 can be more easily suppressed.

  Furthermore, in this embodiment, the second pressed surface 3b of the outer peripheral flange portion 3 is also provided with the three-dimensional shape 11, that is, the protrusion 12, so that the second pressed surface 3b and the housing mounting portion are provided on the outer peripheral side of the protrusion 12. A gap 13 in the thickness direction is formed between the bottom surface 36 d of 36. The gap 13 in the thickness direction also absorbs a part of the elastic deformation of the outer peripheral flange portion 3 due to the vertical compression shown in FIGS. 1 and 2 when the diaphragm 1 is mounted between the first housing 31A and the second housing 31B. doing. Together with the thickness direction gap 8 and the radial direction gap 10, the gap that absorbs elastic deformation of the outer peripheral flange portion 3 can be further expanded, and the occurrence of the lifting of the film portion 2 can be further easily suppressed. The thickness direction gap 13 may be formed not only on the outer peripheral side of the protrusion 12 but also on the inner peripheral side.

  Further, a plurality of convex portions such as the projections 9 and 12 that are the three-dimensional shapes 7 and 11 may be provided in parallel on the first pressed surface 3a or the second pressed surface 3b of the outer peripheral flange portion 3, respectively. In this case, gaps 8 and 13 in the thickness direction are set between the protrusions 9 and 12 to serve as a refuge for the rubber-like elastic body.

  The three-dimensional shapes 7 and 11 may be concave portions instead of the convex portions such as the protrusions 9 and 12, and in this case, the first pressed surface 3a or the second pressed surface 3b of the outer peripheral flange portion 3 is provided. There are gaps 8 and 13 between the outer peripheral flange portion 3 and the bottom surfaces 36c and 36d of the housing mounting portion 36 as a refuge for the rubber-like elastic body in a state in which the bottom surfaces 36c and 36d of the housing mounting portion 36 are in direct contact and pressure contact. Is set. A plurality of recesses may also be provided in parallel. In FIG. 3 and FIG. 4 shown as another embodiment, the upper three-dimensional shape 11 provided on the second pressed surface 3 b of the upper and lower three-dimensional shapes 7, 11 is formed by the groove-shaped recess 14.

  Each of the gaps 8, 10, and 13 functions as a refuge for the rubber-like elastic body when the outer peripheral flange portion 3 is sandwiched between the housings 31 </ b> A and 31 </ b> B and is compressed and deformed. In a state where the compression deformation is completed (a state where the mounting operation is completed), a part or all of it may disappear (filled with a rubber-like elastic body and no longer exist as a space).

DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Film | membrane part 2a One surface 2b The other surface 3 Outer peripheral flange part 3a 1st pressed surface 3b 2nd pressed surface 3c Outer peripheral surface 4 Thick part 4a Front end surface 5 Depression 7,11 Three-dimensional shape 8,13 Thickness Directional gap 9, 12 Protrusion 10 Radial gap 14, 34 Recess 31, 31A, 31B Housing 32 Pressure chamber 33 Vent hole 35 Planar portion 36 Mounting portion 36a Outer peripheral wall 36b Inner peripheral wall 36c, 36d Bottom surface 37 Stepped portion 38 Stopper portion 39 Communication Hole

Claims (5)

A diaphragm having a membrane portion that is flexibly deformed and an outer peripheral flange portion that is integrally provided on a peripheral portion of the membrane portion ,
At least a part of one surface in the thickness direction of the film part and at least a part of one end surface in the thickness direction of the outer peripheral flange part are arranged on the same plane and have a flush plane.
The other end surface in the thickness direction of the outer peripheral flange portion protrudes in the thickness direction from the other surface in the thickness direction of the film portion,
When the diaphragm is mounted between a pair of first housing and second housing, the outer peripheral flange portion is compressed between the pair of first housing and second housing in the thickness direction, and the membrane portion Is a diaphragm in which one surface in the thickness direction is in contact with the first housing over substantially the entire surface ,
The outer peripheral flange portion has a first pressed surface that is one end surface in the thickness direction and is pressed by the first housing, and the first pressed surface is a three-dimensional shape including a convex portion or a concave portion. Is provided,
The three-dimensional shape in a state in which the outer peripheral flange portion is compressed in the thickness direction between the pair of first housing and the second Haujin grayed has a thickness direction gap formed between the outer peripheral flange portion and said first Haujin grayed,
The compressive deformation of the outer peripheral flange portion is absorbed by the gap in the thickness direction so that the influence of the compressive deformation does not easily reach the film portion, and the film portion is prevented from being lifted from the first housing. Diaphragm.   The three-dimensional shape is an annular protrusion provided at a radial center portion of the first pressed surface, and the outer peripheral flange portion is mounted by being compressed and deformed between the first housing and the second housing. The diaphragm according to claim 1, wherein the gap in the thickness direction is formed radially outward from the annular protrusion of the first pressed surface.   The outer peripheral flange portion is mounted between the first housing and the second housing, and the diameter of the diaphragm is between the outer peripheral surface of the outer peripheral flange portion and at least one of the first and second housings. The diaphragm according to claim 1, wherein the diaphragm is set to an outer diameter dimension capable of forming a radial gap in a direction.   The outer peripheral flange portion has a second pressed surface that is the other surface in the thickness direction of the diaphragm and is pressed by the second housing, and a three-dimensional shape including a convex portion or a concave portion on the second pressed surface. The diaphragm according to any one of claims 1 to 3, wherein   A diaphragm support structure comprising a diaphragm sandwiched between a first housing and a second housing, wherein the diaphragm according to any one of claims 1 to 4 is provided as the diaphragm.

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