Diaphragm

Abstract

The utility model provides a diaphragm which can restrain occurrence of breakage. A diaphragm (1) formed from an elastic material is provided with: an inner peripheral section (10) having a disc shape about an axis (x); an outer peripheral part (20) which is annular around the axis (x); and a groove portion (30) connecting the inner peripheral portion (10) and the outer peripheral portion (20), an annular groove (34) recessed along the axis (x) is formed between the inner peripheral portion (10) and the outer peripheral portion (20), and a ratio of a thickness (t) of the diaphragm (1) in a direction along the axis (x) to a height (h) of the diaphragm (1) is 0.12 to 0.16.

Description

Technical Field

[0001] The utility model relates to a diaphragm. Background Art

[0002] In a vehicle transmission, a hydraulic damper is assembled, for example. The hydraulic damper has a diaphragm formed of an elastic material, for example. One surface of the diaphragm faces the gas side, and the other surface opposite to the one surface faces the oil side. The diaphragm is formed in a disc shape around an axis, for example. Summary of the Utility Model

[0003] Problems to be Solved by the Utility Model

[0004] When the hydraulic damper operates, the volume of the oil changes based on temperature. This volume change is absorbed by the central portion of the diaphragm reciprocating along the axis. In a hydraulic damper, a diaphragm is required that can suppress the occurrence of rupture even due to repeated reciprocating movement.

[0005] The present utility model has been completed in view of the above problems, and an object thereof is to provide a diaphragm capable of suppressing the occurrence of rupture.

[0006] Means for Solving the Problems

[0007] To achieve the above object, the present utility model relates to a diaphragm formed of an elastic material, including: an inner peripheral portion formed in a disc shape around an axis; an outer peripheral portion formed in a ring shape around the axis; and a groove portion connecting the inner peripheral portion and the outer peripheral portion, forming an annular groove recessed along the axis between the inner peripheral portion and the outer peripheral portion, and the ratio of the thickness t of the diaphragm in the direction along the axis to the height h of the diaphragm is 0.12 to 0.16.

[0008] The ratio of the maximum diameter d2 of the groove portion defined in the direction orthogonal to the axis to the maximum diameter d1 of the outer peripheral portion is 0.4 to 0.6.

[0009] The diaphragm includes an annular flange portion protruding from the outer peripheral portion along the axis.

[0010] The diaphragm has a first surface on the side where the groove is formed and a second surface opposite to the first surface, the first surface facing the gas side and the second surface facing the oil side.

[0011] In addition, the present utility model relates to a diaphragm formed of an elastic material, comprising: an inner peripheral portion, which is disc-shaped around an axis; an outer peripheral portion, which is annular around the axis; and a groove portion, which connects the inner peripheral portion and the outer peripheral portion and forms an annular groove recessed along the axis between the inner peripheral portion and the outer peripheral portion, and a ratio of a maximum diameter d2 of the groove portion defined in a direction orthogonal to the axis to a maximum diameter d1 of the outer peripheral portion is 0.4 to 0.6.

[0012] Effects of the utility model

[0013] According to the present utility model, a diaphragm can be provided that can suppress the occurrence of rupture. Description of the drawings

[0014] Figure 1 is a perspective view schematically showing a structure of a diaphragm 1 according to an embodiment of the present utility model.

[0015] Figure 2 is along Figure 1 sectional view taken along line 2-2 of.

[0016] Figure 3 is a sectional view for explaining a usage mode of the diaphragm 1 according to an embodiment of the present utility model. Detailed implementation manners

[0017] Hereinafter, embodiments of the present utility model will be described with reference to the drawings. Figure 1 is a perspective view schematically showing a structure of a diaphragm 1 according to an embodiment of the present utility model. Figure 2 is along Figure 1 sectional view taken along line 2-2 of. As described later, the diaphragm 1 is applicable to, for example, a hydraulic damper assembled in a transmission of a vehicle.

[0018] Refer to Figure 1 and Figure 2 collectively, the diaphragm 1 is integrally formed in a disc shape centered on the axis x as a whole. The diaphragm 1 is integrally formed of an elastic material such as rubber, for example. The rubber includes, for example, synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), ethylene propylene rubber (EPDM), acrylic rubber (ACM), and fluororubber (FKM).

[0019] In the diaphragm 1, one direction in the direction along the axis x (hereinafter, simply referred to as "axial direction") is defined as the first direction D1, and the other direction opposite to the first direction D1 is defined as the second direction D2. In addition, the direction orthogonal to the axis x is defined as the radial direction. In this radial direction, the direction approaching the axis x is defined as the inner peripheral side IS, and the direction away from the axis x is defined as the outer peripheral side OS. In addition, a circumferential direction is defined around the axis x.

[0020] The separator 1 has an inner peripheral portion 10, an outer peripheral portion 20, a groove portion 30, and a flange portion 40. The inner peripheral portion 10 is formed, for example, in a disc shape around the axis x. On the other hand, the outer peripheral portion 20 is formed, for example, in an annular shape around the axis x. The outer peripheral portion 20 is disposed on the outer peripheral side OS of the inner peripheral portion 10. That is, the outer peripheral portion 20 surrounds the inner peripheral portion 10 from the outer peripheral side OS. The inner peripheral portion 10 and the outer peripheral portion 20 are defined to be coaxial with each other.

[0021] The inner peripheral portion 10 and the outer peripheral portion 20 are formed of flat plates extending along a hypothetical plane intersecting the axis x. In this example, the inner peripheral portion 10 and the outer peripheral portion 20 extend along a hypothetical plane orthogonal to the axis x. In addition, the inner peripheral portion 10 and the outer peripheral portion 20 are disposed offset from each other in the axial direction. Specifically, the inner peripheral portion 10 is disposed at a position closer to the first direction D1 than the outer peripheral portion 20.

[0022] The inner peripheral portion 10 and the outer peripheral portion 20 are interconnected by an annular groove portion 30 around the axis x. The groove portion 30 has an annular inner wall portion 31 connected to the outer peripheral edge of the inner peripheral portion 10, an annular outer wall portion 32 connected to the inner peripheral edge of the outer peripheral portion 20, and an annular bottom portion 33 connecting the inner wall portion 31 and the outer wall portion 32 to each other. An annular groove 34 is formed by these inner wall portion 31, outer wall portion 32, and bottom portion 33. The groove 34 is recessed from the inner peripheral portion 10 and the outer peripheral portion 20 toward the second direction D2 in the axial direction.

[0023] The outer peripheral surface of the inner wall portion 31 and the inner peripheral surface of the outer wall portion 32 face each other in the radial direction. Specifically, a part of the outer peripheral surface of the inner wall portion 31 faces the entire inner peripheral surface of the outer wall portion 32. In addition, in this example, the inner wall portion 31 is formed of a frustum-shaped wall portion approaching the outer wall portion 32 as it faces the second direction D2. On the other hand, the outer wall portion 32 is formed of a cylindrical wall portion having the axis x as its central axis. The bottom portion 33 is formed of a curved wall portion convex toward the second direction D2.

[0024] The flange portion 40 projects annularly from the outer peripheral portion 20 toward the second direction D2. In this example, the flange portion 40 is formed along the outer peripheral edge of the outer peripheral portion 20. The groove portion 30 is disposed on the inner peripheral side IS of the flange portion 40. The flange portion 40 faces the outer peripheral surface of the outer wall portion 32 of the groove portion 30 from the outer peripheral side OS in the radial direction. The end portion of the flange portion 40 in the second direction D2 is formed in a semi-circular shape convex toward the second direction D2 in a cross-section along a hypothetical plane including the axis x.

[0025] The diaphragm 1 has a first surface S1 facing a first direction D1 and a second surface S2 facing a second direction D2 and facing away from the first surface S1. The first surface S1 and the second surface S2 are defined by an inner peripheral portion 10, an outer peripheral portion 20, and a groove portion 30. A groove 34 is formed in the first surface S1. A flange portion 40 is formed in the second surface S2. That is, the flange portion 40 projects annularly from the second surface S2 toward the second direction D2.

[0026] As Figure 2 shown, the height h of the diaphragm 1 is defined in the axial direction. The height h is the overall height of the diaphragm 1. Specifically, in the axial direction, it is defined by the distance from the first surface S1 of the inner peripheral portion 10, which is the end portion of the diaphragm 1 closest to the first direction D1 side, to the second surface S2 of the bottom 33 of the groove portion 30, which is the end portion of the diaphragm 1 closest to the second direction D2 side.

[0027] In addition, the maximum diameter d1 of the outer peripheral portion 20 is defined in the radial direction. The maximum diameter d1 corresponds to the maximum value of the outer diameter defined by the outer peripheral edge of the outer peripheral portion 20 in the radial direction. Similarly, the maximum diameter d2 of the inner peripheral portion 10 is defined in the radial direction. The maximum diameter d2 corresponds to the maximum value of the inner diameter defined by the second surface S2 of the inner wall portion 31 of the inner peripheral portion 10 in the radial direction. Specifically, the maximum diameter d2 is defined by the end portion of the inner wall portion 31 on the second direction D2 side.

[0028] Furthermore, the thickness t of the diaphragm 1 is defined. Specifically, the thickness t is defined by the distance between the first surface S1 and the second surface S2. In this example, the diaphragm 1 has a constant thickness t from the inner peripheral portion 10 via the groove portion 30 to the outer peripheral portion 20. In Figure 2 this case, as an example, the thickness t is represented by the thickness of the portion of the inner peripheral portion 10 defined along the axis x.

[0029] In the diaphragm 1 related to the present utility model, the ratio of the thickness t to the height h is set to be 0.12 to 0.16. In the previous diaphragms of the present applicant, the ratio of the thickness t to the height h set in the same way was approximately about 0.2. Therefore, in the diaphragm 1, compared with the past, the thickness t of the diaphragm 1 relative to the overall height is set to be smaller. That is, compared with the past, the thickness t of the diaphragm 1 is thinned.

[0030] Similarly, in the diaphragm 1 related to the present utility model, the ratio of the maximum diameter d2 to the maximum diameter d1 is set to be 0.4 to 0.6. In the previous diaphragms of the present applicant, the ratio of the maximum diameter d2 to the maximum diameter d1 set in the same way was approximately about 0.3. Therefore, in the diaphragm 1, compared with the past, the maximum diameter d2 relative to the maximum diameter d1 is set to be larger. That is, compared with the past, the diameter of the inner peripheral portion 10 becomes larger.

[0031] Figure 3This is a cross-sectional view showing the usage mode of the diaphragm 1 involved in an embodiment of the present utility model. As Figure 3 shown, the diaphragm 1 is installed in the cylinder block 51 of the hydraulic damper 50. In this example, the cylinder block 51 has an upper side portion 52 and a lower side portion 53 that defines a space between the upper side portion 52. The diaphragm 1 is sandwiched between the upper side portion 52 and the lower side portion 53 at the flange portion 40.

[0032] The space inside the cylinder block 51 is separated by the diaphragm 1 into a gas chamber 54 filled with gas and an oil chamber 55 filled with oil. That is, the first surface S1 of the diaphragm 1 faces the gas side, and on the other hand, the second surface S2 faces the oil side. In Figure 3 not shown, but a piston that reciprocates inside the cylinder block 51 is accommodated inside the cylinder block 51.

[0033] In the hydraulic damper 50, during use, oil flows through the reciprocating motion of the piston. The oil passes through the throttle holes formed in the piston, thereby generating a damping force. At this time, the volume of the oil changes according to the temperature. This volume change is absorbed by the axial reciprocating movement of the inner peripheral portion 10 caused by the elastic deformation of the groove portion 30 of the diaphragm 1. In this way, the hydraulic damper 50 operates.

[0034] In the hydraulic damper 50 as described above, the ratio of the thickness t of the diaphragm 1 to the height h is set to 0.12 to 0.16, and the ratio of the maximum diameter d2 of the inner peripheral portion 10 to the maximum diameter d1 of the diaphragm 1 is set to 0.4 to 0.6. According to such a design, compared with the prior art, the thickness t of the diaphragm 1 can be reduced, and the maximum diameter d2 of the inner peripheral portion 10 can be increased.

[0035] According to such a dimensional design, when the inner peripheral portion 10 reciprocates axially, the inner peripheral portion 10 can move axially more greatly compared with the prior art. That is, the diaphragm 1 can allow a larger volume change amount compared with the prior art. In this way, it is possible to avoid stress concentration on the inner peripheral portion 10 and the groove portion 30. As a result, the occurrence of rupture of the diaphragm 1 can be suppressed. The product life of the diaphragm 1 can be extended. In addition, by reducing the thickness t, the manufacturing cost of the diaphragm 1 can be suppressed.

[0036] In the above-described diaphragm 1, the ratio of the thickness t of the diaphragm 1 to the height h is set to 0.12 to 0.16, and the ratio of the maximum diameter d2 of the inner peripheral portion 10 to the maximum diameter d1 of the diaphragm 1 is set to 0.4 to 0.6, but the function of the present utility model can also be achieved by setting either one of the dimensions.

[0037] As described above, the present utility model has been described by the above embodiments, but the technical scope of the present utility model is not limited to the scope described in the above embodiments. For those skilled in the art, it is obvious that various changes or improvements can be made to the above embodiments. According to the description in the claims, the embodiments with such changes or improvements can also be included in the technical scope of the present utility model.

[0038] The embodiments described above are for easy understanding of the present utility model and are not used to limit or interpret the present utility model. In addition, the above embodiments do not limit the objects to which the present utility model is applied, and the present utility model can include all objects as its application objects. The respective components, their configurations, materials, conditions, shapes, dimensions, etc. of the above embodiments are not limited to the illustrated content and can be appropriately changed. For example, the present utility model includes the differences generated in the implementation of manufacturing tolerances, etc. In addition, within the scope of no technical contradiction, the components shown in different embodiments can be partially replaced or combined with each other. In addition, the respective structures can be selectively combined appropriately to achieve at least part of the above problems and effects.

[0039] Description of Reference Numerals

[0040] 1 diaphragm, 10 inner peripheral portion, 20 outer peripheral portion, 30 groove portion, 31 inner wall portion, 32 outer wall portion, 33 bottom portion, 34 groove, 40 flange portion, 50 hydraulic damper, 51 cylinder block, 52 upper side portion, 53 lower side portion, 54 gas chamber, 55 oil chamber, D1 first direction, D2 second direction, d1 maximum diameter, d2 maximum diameter, IS inner peripheral side, OS outer peripheral side, h height, S1 first surface, S2 second surface, t thickness, x axis.

Claims

1. A diaphragm formed of an elastic material, characterized in that: include: The inner circumference is disc-shaped around the axis; An outer peripheral portion, which is annular around the axis; as well as a groove portion connecting the inner peripheral portion and the outer peripheral portion, and forming an annular groove recessed along the axis between the inner peripheral portion and the outer peripheral portion, A ratio of a thickness (t) of the diaphragm in a direction along the axis relative to a height (h) of the diaphragm is 0.12 to 0.

16.

2. The diaphragm according to claim 1, characterized in that A ratio of a maximum diameter (d2) of the groove portion defined in a direction orthogonal to the axis to a maximum diameter (d1) of the outer peripheral portion is 0.4 to 0.

6.

3. The diaphragm according to claim 1, characterized in that The diaphragm includes an annular flange portion protruding from the outer peripheral portion along the axis.

4. The diaphragm according to claim 1 or 2, characterized in that: The diaphragm includes a first surface on which the groove is formed and a second surface facing away from the first surface. The first surface faces the gas side, and the second surface faces the oil side.

5. A diaphragm formed of an elastic material, characterized in that: include: The inner circumference is disc-shaped around the axis; An outer peripheral portion, which is annular around the axis; as well as a groove portion connecting the inner peripheral portion and the outer peripheral portion, and forming an annular groove recessed along the axis between the inner peripheral portion and the outer peripheral portion, A ratio of a maximum diameter (d2) of the groove portion defined in a direction orthogonal to the axis to a maximum diameter (d1) of the outer peripheral portion is 0.4 to 0.6.

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