mount
The mount design with a sleeve and elastic body configuration addresses durability issues by controlling deformation and stress through a specific annular portion arrangement, maintaining reliability for lightweight devices.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NOK CORP
- Filing Date
- 2022-03-07
- Publication Date
- 2026-05-29
Smart Images
Figure 0007867348000001 
Figure 0007867348000002 
Figure 0007867348000003
Abstract
Description
Technical Field
[0001] The present invention relates to a mount, and more particularly to a mount for supporting an object.
Background Art
[0002] Conventionally, mounts have been used as devices for supporting objects. Some mounts have a function of absorbing or buffering vibrations and forces from the supporting device or the supported device. Among such mounts, mounts for supporting automotive accessories or small devices are formed only of an elastic body or are formed of an elastic body and a sleeve attached to the elastic body because the objects to be supported are lightweight (see, for example, Patent Document 1).
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] In recent years, due to the trend of e-Mobility, the devices mounted on vehicles and the like have become lighter. In order to enhance the vibration isolation effect of the mounts used to support these devices, it is required to lower the elastic modulus of the spring portion, which is the part that exhibits the vibration isolation effect. When the elastic modulus of the spring portion is lowered, the spring portion becomes more likely to deform. Therefore, the deformation of the spring portion due to the load from the supported object becomes larger. When the deformation of the spring portion becomes larger, stress concentration may occur locally in the mount along with this deformation, and cracks may occur in the mount. In addition, when the deformation of the spring portion becomes larger, creep may occur in the spring portion. For this reason, there is a need for a configuration that can suppress a decrease in durability even when the elastic modulus of the spring portion is lowered for conventional mounts of this type.
[0005] The object of the present invention is to provide a mount that can suppress a decrease in durability even if the elastic modulus of the spring portion is low. [Means for solving the problem]
[0006] The mount according to the present invention comprises a sleeve which is a cylindrical member extending along an axis, and an elastic body portion formed from an elastic body attached to the sleeve, wherein the elastic body portion has a mounting portion which is an annular portion around the axis, a stopper portion which is an annular portion around the axis, a spring portion which is an annular portion around the axis, and a sleeve holding portion which is a portion that holds the sleeve, wherein the stopper portion is located on one side in the axial direction from the mounting portion, the sleeve holding portion is located on the inner circumference side of the mounting portion and the stopper portion, the spring portion extends between the stopper portion and the sleeve holding portion and has a bent portion which is a portion that curves convexly to the one side in the axial direction, the spring portion on the outer circumference side forms an annular space between itself and the stopper portion that opens to the one side in the axial direction, and on the inner circumference side forms an annular space between itself and the sleeve holding portion that opens to the one side in the axial direction.
[0007] In a mount according to one aspect of the present invention, one end of the bent portion of the spring portion is located on the one side in the axial direction, relative to the one end of the stopper portion.
[0008] In a mount according to one aspect of the present invention, one end of the sleeve holding portion is located on the one side in the axial direction relative to the one end of the bent portion of the spring portion.
[0009] In a mount according to one aspect of the present invention, when the one end of the sleeve holding portion and the one end of the stopper portion are at the same position in the axial direction, the one end of the spring portion does not protrude further in the axial direction than the one end of the stopper portion.
[0010] In a mount according to one aspect of the present invention, distance a is the distance in the axial direction between the other end in the axial direction of the space that opens to one side between the spring portion and the stopper portion and the end on one side of the stopper portion; distance b is the distance in the axial direction between the other end in the axial direction of the space that opens to one side between the spring portion and the stopper portion and the end on one side of the bent portion of the spring portion; and distance S is the distance in the axial direction between the end on one side of the stopper portion and the end on one side of the sleeve holding portion, where b
[0011] In a mount according to one aspect of the present invention, an annular groove recessed on the inner circumference is formed between the mounting portion and the stopper portion. [Effects of the Invention]
[0012] According to the mount of the present invention, even if the elastic modulus of the spring portion is low, a decrease in durability can be suppressed. [Brief explanation of the drawing]
[0013] [Figure 1] This is a perspective view of a mount according to an embodiment of the present invention, cut along the axis. [Figure 2] This is a cross-sectional view along the axis of the mount shown in Figure 1. [Figure 3] This is a partially enlarged cross-sectional view showing the vicinity of the spring portion of the mount shown in Figure 1. [Figure 4] This figure shows the usage status of the mount shown in Figure 1. [Figure 5] Figure 4 is a cross-sectional view showing the mount in its bottomed-out state during use. [Modes for carrying out the invention]
[0014] Embodiments of the present invention will be described below with reference to the drawings.
[0015] Figure 1 is a perspective view of a mount 1 according to an embodiment of the present invention, cut in a cross-section along axis x, and Figure 2 is a cross-sectional view of the mount 1 according to an embodiment of the present invention in a cross-section along axis x. The mount according to the present invention is used, for example, to support auxiliary equipment of a vehicle when supported by a vehicle. The application of the mount according to the present invention is not limited to vehicles.
[0016] For the sake of explanation, in the following, the side in the direction of arrow a (see Figure 2) in the x-axis direction (one side in the axial direction) will be referred to as the supported side, and the side in the direction of arrow b (see Figure 2) in the x-axis direction (the other side in the axial direction) will be referred to as the supporting side. More specifically, the supported side is the side of the supported object, such as an accessory, that is supported by Mount 1, and the supporting side is the side of the support that supports Mount 1, such as an engine or vehicle frame. Furthermore, in the direction perpendicular to the x-axis (hereinafter also referred to as the "radial direction"), the side moving away from the x-axis (direction of arrow c in Figure 2) will be referred to as the outer circumference side, and the side moving towards the x-axis (direction of arrow d in Figure 2) will be referred to as the inner circumference side. Note that the x-axis is a hypothetical line.
[0017] As shown in Figures 1 and 2, the mount 1 comprises a sleeve 2, which is a cylindrical member extending along the axis x, and an elastic body portion 3 formed from an elastic body attached to the sleeve 2. The elastic body portion 3 has a mounting portion 10, which is an annular portion around the axis x, a stopper portion 20, which is an annular portion around the axis x, a spring portion 30, which is an annular portion around the axis x, and a sleeve holding portion 40, which is a portion that holds the sleeve 2. The stopper portion 20 is located on the supported side (one side in the direction of the axis x) (the side in the direction of arrow a in Figure 2) of the mounting portion 10, and the sleeve holding portion 40 is located on the inner circumference side of the mounting portion 10 and the stopper portion 20. The spring portion 30 extends between the stopper portion 20 and the sleeve holding portion 40 and has a bent portion 31, which is a portion that bends convexly toward the supported side. The spring portion 30 forms an annular space G1 on its outer circumference side (in the direction of arrow c in Figure 2) between itself and the stopper portion 20, which is open to the supported side. On its inner circumference side, it forms an annular space G2 between itself and the sleeve holding portion 40, which is open to the supported side. The mount 1 will be described in detail below.
[0018] Sleeve 2 is a cylindrical member extending along axis x, and is made of, for example, metal. As shown in Figures 1 and 2, Sleeve 2 is a cylindrical or substantially cylindrical member with axis x as its central axis or substantially its central axis. As will be described later, a fixing mechanism for fixing the support to Mount 1 is installed inside Sleeve 2. The fixing mechanism is, for example, a bolt and a nut, where the bolt penetrates the support and is passed through Sleeve 2, the nut is screwed onto the bolt, the bolt and nut are fixed to Sleeve 2, and the support is fixed to Sleeve 2.
[0019] The mounting portion 10 is, for example, as shown in FIGS. 1 and 2, an annular portion having the axis x as the central axis or substantially the central axis, and extends, for example, along a virtual line that draws a circle centered on the axis x. The mounting portion 10 has, for example, a tapered surface 11 on the outer peripheral side of the end on the support side. The tapered surface 11 is a surface that decreases in diameter toward the support side, and is, for example, a conical surface or a substantially conical surface having the axis x as the central axis or substantially the central axis. The mounting portion 10 has an outer peripheral surface 12 that is a cylindrical surface extending from the end on the supported side of the tapered surface 11 toward the supported side, and also has a clamping surface 13 that is a surface extending from the end on the supported side of the outer peripheral surface 12 toward the inner peripheral side. The clamping surface 13 is an annular surface and is, for example, parallel or substantially parallel to a virtual plane orthogonal to the axis x.
[0020] Further, as shown in FIGS. 1 and 2, the mounting portion 10 has a groove bottom surface 14 that is a cylindrical surface extending from the end on the inner peripheral side of the clamping surface 13 toward the supported side. The groove bottom surface 14 is, for example, as shown in FIG. 2, a cylindrical surface or a substantially cylindrical surface having the axis x as the central axis or substantially the central axis. The mounting portion 10 also has an inner peripheral surface 15 that is a surface facing the inner peripheral side. The inner peripheral surface 15 is a cylindrical surface extending along the axis x as shown in FIG. 2. The inner peripheral surface 15 is, for example, a cylindrical surface or a substantially cylindrical surface having the axis x as the central axis or substantially the central axis. Further, the inner peripheral surface 15 is, for example, a surface that decreases in diameter as it goes toward the supported side, and is, for example, a conical surface or a substantially conical surface having the axis x as the central axis or substantially the central axis. An annular end face 16 extends at the end on the support side of the mounting portion 10.
[0021] As shown in FIGS. 1 and 2 for example, the stopper portion 20 is an annular portion having the axis x as its central axis or substantially central axis, and extends along a virtual line that draws a circle centered on the axis x. The stopper portion 20 has, for example, a grounding surface 21 which is an annular surface extending from the supported-side end of the groove bottom surface 14 of the mounting portion 10 to the outer peripheral side. The grounding surface 21 is an annular surface and is parallel or substantially parallel to a virtual plane orthogonal to the axis x, for example. The grounding surface 21 faces the clamping surface 13 of the mounting portion 10 at the inner peripheral side portion, and the grounding surface 21 extends to the outer peripheral side of the clamping surface 13 of the mounting portion 10. Further, the stopper portion 20 has an outer peripheral surface 22 which is a cylindrical surface extending from the outer peripheral side end of the grounding surface 21 to the supported side, and a stopper surface 23 which is a surface extending from the supported-side end of the outer peripheral surface 22 to the inner peripheral side. The stopper surface 23 is an annular surface and is parallel or substantially parallel to a virtual plane orthogonal to the axis x, for example.
[0022] Further, the stopper portion 20 has an inner inner peripheral surface 24 which is a surface facing the inner peripheral side and extending from the inner peripheral surface 15 of the mounting portion 10. The inner inner peripheral surface 24 is smoothly connected to the inner peripheral surface 15. As shown in FIG. 2, the inner inner peripheral surface 24 is a cylindrical surface extending along the axis x. The inner inner peripheral surface 24 is, for example, a surface whose diameter decreases as it goes toward the supported side, and is, for example, a conical surface or a substantially conical surface having the axis x as its central axis or substantially central axis. Further, the inner inner peripheral surface 24 is, for example, a cylindrical surface or a substantially cylindrical surface having the axis x as its central axis or substantially central axis. As shown in FIG. 2, in the stopper portion 20, the inner inner peripheral surface 24 is a portion that radially faces away from the supported-side portion of the outer peripheral surface 22.
[0023] Furthermore, the stopper portion 20 has an outer inner circumferential surface 25 that extends from the inner circumferential end of the stopper surface 23 toward the support side and faces the inner circumferential side. As shown in Figure 2, the outer inner circumferential surface 25 is a cylindrical surface that extends along the axis x. The outer inner circumferential surface 25 is, for example, a surface that decreases in diameter toward the support side, and is, for example, a conical surface or a substantially conical surface with axis x as its central axis or substantially central axis. Alternatively, the outer inner circumferential surface 25 is, for example, a cylindrical surface or a substantially cylindrical surface with axis x as its central axis or substantially central axis. As shown in Figure 2, in the stopper portion 20, the outer inner circumferential surface 25 is the portion that faces radially backward from the supported side portion of the outer circumferential surface 22.
[0024] As described above, the mounting portion 10 and the stopper portion 20 are connected, and the boundary line L1 shown by the dashed line in Figure 2 is the boundary between the mounting portion 10 and the stopper portion 20 in cross-section. Note that the boundary line L1 is a hypothetical line. In other words, the mounting portion 10 and the stopper portion 20 are integrally connected by the portion between the supported end of the groove bottom surface 14 of the mounting portion 10 and the supported end of the inner circumferential surface 15, and the portion between the inner circumferential end of the contact surface 21 of the stopper portion 20 and the supporting end of the inner inner circumferential surface 24.
[0025] The sleeve holding portion 40 is the part that holds the sleeve 2 on its outer circumference, and is attached to the entire outer surface 2a of the sleeve 2, for example, as shown in Figure 2. The sleeve holding portion 40 may also be attached to a part of the outer surface 2a of the sleeve 2. The sleeve holding portion 40 is attached to the sleeve 2, for example, by adhesive. The sleeve 2 may be press-fitted into the sleeve holding portion 40. Furthermore, the thickness of the sleeve holding portion 40 increases towards the support side, for example, as shown in Figure 2. Note that thickness refers to the thickness in the radial direction.
[0026] As described above, the spring portion 30 has a bent portion 31 that bends convexly toward the supported side, and is an annular, membrane-like portion that bends to protrude toward the supported side. The spring portion 30 has, for example, as shown in Figures 1 and 2, an outer circumference cylindrical portion 32 which is located on the outer circumference side, and an inner circumference cylindrical portion 33 which is located on the inner circumference side of the outer circumference cylindrical portion 32. The outer circumference cylindrical portion 32 is integrally connected to the outer circumference end of the bent portion 31 at the end on the supported side, and the inner circumference cylindrical portion 33 is integrally connected to the inner circumference end of the bent portion 31 at the end on the supported side. Furthermore, the outer circumference cylindrical portion 32 is integrally connected to the stopper portion 20 at the end on the supporting side, and the inner circumference cylindrical portion 33 is integrally connected to the sleeve holding portion 40 at the end on the supporting side.
[0027] In Figure 2, the boundary line L2, shown by a dashed line, represents the boundary between the stopper portion 20 and the spring portion 30 in cross-section. In other words, the portion between the supported end of the inner circumferential surface 24 of the stopper portion 20 and the supporting end of the outer circumferential surface 25 of the stopper portion 20, and the supporting end of the outer circumferential cylindrical portion 32 of the spring portion 30, are integrally connected to the stopper portion 20 and the spring portion 30. Also, the boundary line L3, shown by a dashed line in Figure 2, represents the boundary between the sleeve holding portion 40 and the spring portion 30 in cross-section. For example, the supporting end of the inner circumferential cylindrical portion 33 of the spring portion 30 is integrally connected to the portion of the outer circumferential surface 41 of the sleeve holding portion 40, on the supporting side of the center in the axial x direction of the sleeve holding portion 40. Furthermore, as shown in Figure 2, for example, the boundary line L2 between the stopper portion 20 and the spring portion 30 and the boundary line L3 between the sleeve holding portion 40 and the spring portion 30 are opposite each other in the radial direction, and their positions in the axial x direction are the same or close to each other. Note that boundary lines L2 and L3 are virtual lines.
[0028] Figure 3 is a partially enlarged cross-sectional view showing the vicinity of the spring portion 30 of the mount 1. As shown in Figure 3, the outer cylindrical portion 32 of the spring portion 30 is tapered in diameter towards the supported side, and, for example, except for the transition portion 32a which connects to the stopper portion 20, it is a conical or approximately conical cylindrical shape with axis x as the central axis or approximately the central axis. This conical or approximately conical cylindrical portion (rising portion 32b) has a constant or approximately constant thickness throughout the entire extension direction. The thickness of the rising portion 32b is the width of the rising portion 32b in the direction perpendicular to the extension direction of the rising portion 32b in the cross-section shown in Figure 3. As shown in Figures 2 and 3, in the cross-section, the rising portion 32b is inclined toward axis x (inner circumference side) toward the supported portion side. The shape of the rising portion 32b is not limited to the shape described above and may be other shapes. For example, the rising portion 32b may be parallel or substantially parallel to the axis x in cross-section, and may be inclined toward the outer circumference toward the supported portion. Also, the rising portion 32b may extend along a curve in cross-section.
[0029] As shown in Figure 3, the inner circumferential cylindrical portion 33 of the spring portion 30 expands in diameter towards the supported side, and, for example, except for the transition portion 33a which connects to the sleeve holding portion 40, it is a conical or substantially conical cylindrical shape with axis x as the central axis or substantially the central axis. This conical or substantially conical cylindrical portion (rising portion 33b) has a constant or substantially constant thickness over the entire extension direction. The thickness of the rising portion 33b is the width of the rising portion 33b in the direction perpendicular to the extension direction of the rising portion 33b in the cross-section shown in Figure 3. As shown in Figures 2 and 3, in the cross-section, the rising portion 33b is inclined outward toward the supported side. The shape of the rising portion 33b is not limited to the shape described above and may be other shapes. For example, the rising portion 33b may be parallel or substantially parallel to axis x in the cross-section, and may be inclined inward toward the supported portion. Furthermore, the rising portion 33b may extend along a curve in cross-section.
[0030] As shown in Figure 3, the transition portion 32a of the outer circumferential cylindrical portion 32 of the spring portion 30 is smoothly connected to the stopper portion 20. For example, the inner circumferential surface of the transition portion 32a is flush with the inner circumferential surface 24 of the stopper portion 20. Also, for example, the outer circumferential side surface 32c, which is the surface facing the outer circumferential side of the transition portion 32a, is a curved surface that curves inward toward the support side in cross-section, as shown in Figure 3, and the curvature in cross-section increases from the rising portion 32b side. For example, the curve drawn by the outer circumferential side surface 32c of the transition portion 32a in the cross-section shown in Figure 3 is made up of multiple curves, each with a different curvature, and the curvature of the curve increases from the rising portion 32b side. For example, the curve drawn by the outer circumferential side surface 32c of the transition portion 32a in the cross-section shown in Figure 3 consists of two curves, each with a different curvature, and the curvature of the curve on the rising portion 32b side is smaller than the curvature of the curve on the outer circumferential surface 25 side of the stopper portion 20. The transition surface 25a, which is the part of the outer inner circumferential surface 25 of the stopper portion 20 that connects to the outer cylindrical portion 32, is a curved surface that forms a curve that is recessed toward the support side in cross-section, as shown in Figure 3, for example.
[0031] As shown in Figure 3, the transition portion 33a of the inner circumferential cylindrical portion 33 of the spring portion 30 smoothly connects to the outer circumferential surface 41 of the sleeve holding portion 40. For example, the outer circumferential surface of the transition portion 33a is a curved surface that curves inward toward the supported side in cross-section, as shown in Figure 3, and smoothly connects to the outer circumferential surface 41 of the sleeve holding portion 40. Also, for example, the inner circumferential side surface 33c, which is the surface facing the inner circumferential side of the transition portion 33a, is a curved surface that curves inward toward the supported side in cross-section, as shown in Figure 3, and the curvature in cross-section is constant. The transition surface 41a, which is the part of the outer circumferential surface 41 of the sleeve holding portion 40 that connects to the inner circumferential cylindrical portion 33, is a curved surface that curves inward toward the supported side in cross-section, as shown in Figure 3.
[0032] In the spring portion 30, as described above, the bent portion 31 is connected to the rising portion 32b of the outer peripheral cylindrical portion 32 on the outer peripheral side, and to the rising portion 33b of the inner peripheral cylindrical portion 33 on the inner peripheral side. Furthermore, the thickness of the rising portion 32b on the outer peripheral side is greater than the thickness of the rising portion 33b on the inner peripheral side. Therefore, the thickness of the outer peripheral end of the bent portion 31 is greater than the thickness of the inner peripheral end of the bent portion 31. For example, the thickness of the bent portion 31 gradually increases from the inner peripheral end to the outer peripheral end. Specifically, for example, the inner surface 31a, which is the surface of the bent portion 31 facing the support side, is a curved surface that draws a curve with a constant curvature in cross-section, as shown in Figure 3. Similarly, the outer surface 31b, which is the surface of the bent portion 31 facing the supported side, is a curved surface that draws a curve with a constant curvature in cross-section, as shown in Figure 3. Furthermore, the curvature of the inner surface 31a in cross-section is greater than the curvature of the outer surface 31b in cross-section.
[0033] As described above, the inner surface 31a of the bent portion 31 of the spring portion 30 is recessed toward the supported side, and the spring portion 30 forms a spring portion space G3, which is an annular space that opens toward the supported side. In addition, the inner circumferential surface 24 of the stopper portion 20 faces the outer circumferential surface 41 of the sleeve holding portion 40 and forms an annular space G4 between it and the outer circumferential surface 41, and the inner circumferential surface 15 of the mounting portion 10 faces the outer circumferential surface 41 of the sleeve holding portion 40 and forms an annular space G5 between it and the outer circumferential surface 41. The spring portion space G3 is in communication with space G4, and space 4 is in communication with space G5, and the spring portion space G3, space G4, and space G5 form an annular space that opens toward the supported side.
[0034] Furthermore, as shown in Figure 3, the end of the outer surface 31b of the bent portion 31 of the spring portion 30 that is supported in the axial x direction (tip 31c) is located on the supported side in the axial x direction more than the stopper surface 23, which is the supported end of the stopper portion 20. Also, as shown in Figure 2, the end of the sleeve 2 that is supported in the axial x direction (tip 2b) is located on the supported side in the axial x direction more than the tip 31c of the outer surface 31b of the bent portion 31 of the spring portion 30. In this way, the spring portion 30 is surrounded by the stopper portion 20 and the sleeve holding portion 40, and an annular outer peripheral space G1 that opens to the supported side is formed between the stopper portion 40 and the spring portion 30, and an annular inner peripheral space G2 that opens to the supported side is formed between the spring portion 30 and the sleeve holding portion 40.
[0035] As shown in Figures 1-3, in the free state of mount 1 where no external force is applied, the rear end 2c, which is the support-side end of sleeve 2, does not protrude beyond the end face 16 of the mounting portion 10, for example, and is located within the space G5. However, in the free state of mount 1, the rear end 2c, which is the support-side end of sleeve 2, may protrude beyond the end face 16 of the mounting portion 10.
[0036] As described above, the mounting portion 10 has a clamping surface 13 and a groove bottom surface 14, and the stopper portion 20 has a contact surface 21. The contact surface 21 is connected to the supported end of the groove bottom surface 14 at its inner circumference end. In this way, the clamping surface 13, the groove bottom surface 14, and the contact surface 21 form a mounting groove 4, which is an annular groove that is recessed inward, and the mount 1 has a mounting groove 4 between the mounting portion 10 and the stopper portion 20. As will be described later, the mounting groove 4 is designed so that a member of the support body on which the mount 1 is supported fits into the mounting groove 4, thereby fixing the mount 1 to the support body.
[0037] As described above, in the free state of mount 1, as shown in Figure 2, the tip 2b of sleeve 2 is located on the supported side in the axial x direction more than the tip 31c of spring portion 30, and the tip 31c of spring portion 30 is located on the supported side in the axial x direction more than the stopper surface 23 of stopper portion 20. In the usage state of mount 1 described later, in the bottom state where the supported object supported by mount 1 is in contact with the stopper surface 23 of stopper portion 20, the end of spring portion 30 on the supported side in the axial x direction does not come into contact with the supported object. For example, as shown in Figure 2, in the free-state mount 1, if distance a is the distance in the axial x direction between the end g1 of the outer peripheral space G1 between the spring portion 30 and the stopper portion 20 and the stopper surface 23 of the stopper 20, distance b is the distance in the axial x direction between the tip 31c of the spring portion 30 and the end g1 of the outer peripheral space G1, and distance S is the distance in the axial x direction between the tip 2b of the sleeve 2 and the stopper surface 23 of the stopper portion 20, then distances a, b, and S are set to satisfy the following equation (1). Note that end g1 is the support-side end of the outer peripheral space G1 in the axial x direction, and is, for example, the part where the outer peripheral side surface 32c of the transition portion 32a of the outer peripheral cylindrical portion 32 connects to the transition surface 25a of the outer inner peripheral surface 25.
[0038] (Math 1) b
[0039] When the sleeve 2 and the sleeve holding portion 40 move to the support side due to the load from the supported body in the usage state of the mount 1, the transition portion 33a of the spring portion 30 is pulled to the support side, the spring portion 30 is deformed, and an elastic force is generated. The elastic force generated by the deformation of the spring portion 30 acts against the load from the supported body, the buffering function is exerted, and the displacement of the supported body is suppressed. The spring portion 30 has the shape as described above. That is, it continues from the sleeve holding portion 40 side with a cylindrical inner peripheral side cylinder portion 33, a bent portion 31 bent convexly toward the supported side, and a cylindrical outer peripheral side cylinder portion 32. When the transition portion 33a is pulled, the bent portion 31 is first deformed so as to be further bent. As a result, for example, the curvature in the cross section shown in FIG. 3 of the inner surface 31a of the bent portion 31 increases, and the tip in the axial direction x of the bent portion 31 is displaced outward in the radial direction from the position of the tip 31c in the free state and is displaced to the support side in the axial direction x.
[0040] Assuming that the bent portion 31 of the spring portion 30 is a bent portion that bends 180°, when the sleeve 2 moves a distance s to the support side in the axial direction x, the tip in the axial direction x of the bent portion 31 moves a distance s / 2 to the support side in the axial direction x. In this assumed case, when the sleeve 2 moves a distance S to the support side in the axial direction x and reaches the bottom state, the tip in the axial direction x of the bent portion 31 is at a position that has moved S / 2 to the support side in the axial direction x. In this assumed case, in order to prevent the spring portion 30 from contacting the supported body in the bottom state, in the mount 1 in the natural state, b - S / 2 < a must hold. That is, it is necessary to satisfy the above formula (1). Based on the condition for preventing the spring portion 30 from contacting the supported body in the bottom state in this assumed case, in this mount 1 as well, in the natural state of the mount 1, it is shaped to satisfy the formula (1). In the mount 1 that satisfies the formula (1) in the natural state, the form of the bent portion 31 such as the curvature of the bent portion 31 is in a form such that the spring portion 30 does not contact the supported body in the bottom state.
[0041] As described above, the spring portion 30 has a bent portion 31, and the spring portion 30 is in contact with the annular outer peripheral space G1 on its outer circumference and with the annular inner peripheral space G2 on its inner circumference. Therefore, the elastic force of the spring portion 30 can be reduced, and the elastic force of the spring portion 30 is low. For example, compared to a mount having a spring portion in which the bent portion 31 extends from the stopper surface 23 of the stopper portion 20 without having an outer peripheral cylindrical portion 32, the mount 1 can have a lower modulus of elasticity. In addition, the thickness of the bent portion 31 is thicker on the outer circumference, and the thickness of the outer peripheral cylindrical portion 32 is also thicker, so in the bottom state, the outer peripheral portion of the spring portion 30, which has a strong elastic force, undergoes elastic deformation, and creep is suppressed from occurring in the inner peripheral portion of the spring portion 30, such as the inner peripheral cylindrical portion 33.
[0042] As described above, the elastic body portion 3 has a mounting portion 10, a stopper portion 20, a spring portion 30, and a sleeve holding portion 40. However, the elastic body portion 3 is integrally formed from the same material, and the mounting portion 10, the stopper portion 20, the spring portion 30, and the sleeve holding portion 40 are each part of the integrally formed elastic body portion 3.
[0043] Next, the operation of the mount 1 having the above-described configuration will be explained. Figure 4 shows the state of use of the mount 1, in which the mount 1 is fixed to the support 60 and the supported object 50 is supported by the mount 1. The supported object 50 is, for example, a device such as a vacuum pump used in a vehicle, and the support 60 is, for example, the frame or other components of the vehicle body. The supported object 50 is not limited to a device such as a vacuum pump used in a vehicle, and the support 60 is not limited to the frame or other components of the vehicle body.
[0044] Mount 1 is fixed to the support 60 by press-fitting its mounting portion 10 into the through-hole 63 of the support 60, which then enters the mounting groove 4 of the mount 1, and the portion of the support 60 near the through-hole 63 is housed in the mounting groove 4. Since a tapered surface 11 is formed on the support side of the mounting portion 10, the tapered surface 11 acts as a guide for press-fitting the mounting portion 10 into the through-hole 63, making press-fitting of the mounting portion 10 into the through-hole 63 easier. As shown in Figure 4, in the usage state in which the mount 1 is fixed to the support 60, the contact surface 21 of the stopper portion 20 of the mount 1 contacts the support surface 61, which is the supported side of the support 60, and the mount 1 is supported by the support 60. In addition, the clamping surface 13 of the mounting portion 10 faces the back surface 62, which is the support side of the support 60. This prevents the mount 1 attached to the support 60 from coming off the support 60. The clamping surface 13 of the mounting groove 4 may press against the back surface 62 of the support 60, or the clamping surface 13 may face the back surface 62 with a gap in between. As described above, the contact surface 21 of the mounting groove 4 extends further outward than the clamping surface 13, and the surface area of the contact surface 21 is larger than the surface area of the clamping surface 13. This stabilizes the support of the mount 1 by the support 60. On the other hand, the smaller surface area of the clamping surface 13 facilitates insertion into the through hole 63 of the mounting portion 10.
[0045] The supported object 50 is fixed to the sleeve 2 by inserting a bolt 70, which is an example of a fixing mechanism, into a through hole 53 of the supported object 50, inserting the bolt 70 into the sleeve 2 from the supported side, and screwing a nut 71, which is an example of a fixing mechanism, onto the bolt 70 on the supporting side, thereby fixing the bolt 70 and nut 71 to the sleeve 2 and fixing the supported object 50 to the sleeve 2. As shown in Figure 4, in the state of use, the supporting side surface 51 of the supported object 50 is in contact with the tip 2b of the sleeve 2, the fastening surface of the bolt 70 is in contact with the supported side surface 52 of the supported object 50, and the supported object 50 is pressed between the bolt 70 and the sleeve 2, thereby fixing the supported object 50 to the mount 1.
[0046] Figure 5 is a cross-sectional view showing the mount 1 in its bottom state, where the supported object 50 is in contact with the stopper surface 23 of the stopper portion 20 during use. As described above, the mount 1 is configured such that the stopper portion 20, the spring portion 30, and the sleeve holding portion 40 satisfy the relationship of equation (1) above. Therefore, even in the bottom state, as shown in Figure 5, the spring portion 30 does not come into contact with the surface 52 of the supported object 50 and is not pushed toward the support side. This prevents large stresses from occurring in the outer cylindrical portion 32 of the spring portion 30 and the connection between the stopper portion 20 and the spring portion 30, prevents large distortions from occurring, and suppresses creep in the outer cylindrical portion 32 of the spring portion 30 and the connection between the stopper portion 20 and the spring portion 30. Furthermore, this prevents large stresses from occurring at the connection points between the spring portion 30 and the outer cylindrical portion 32 of the spring portion 30 or the stopper portion 20, thereby preventing large distortions from occurring and suppressing the occurrence of cracks at the connection points between the spring portion 30 and the outer cylindrical portion 32 of the spring portion 30 or the stopper portion 20.
[0047] Furthermore, as described above, the spring portion 30 has a bent portion 31, and the spring portion 31 has an outer peripheral cylindrical portion 32, and an outer peripheral space G1 is formed between this outer peripheral cylindrical portion 32 and the stopper portion 20. For this reason, the spring portion 30 is easily deformed to bend further at the bent portion 31 as the sleeve 2 moves toward the support side, and the outer peripheral cylindrical portion 32 is also easily deformed to bend as the sleeve 2 moves toward the support side. In this way, the spring portion 30 of the mount 1 has a low modulus of elasticity. For this reason, as the sleeve 2 moves toward the support side, it is possible to prevent large stresses from being generated at the inner peripheral cylindrical portion 33 of the spring portion 30 and at the connection point between the sleeve holding portion 40 and the spring portion 30, thereby preventing large distortions from occurring and suppressing creep at the inner peripheral cylindrical portion 33 of the spring portion 30 and at the connection point between the sleeve holding portion 40 and the spring portion 30. Furthermore, this prevents large stresses from occurring at the connection points between the spring portion 30 and the inner circumferential cylindrical portion 33 of the spring portion 30 or the sleeve holding portion 40, thereby preventing large distortions from occurring and suppressing the occurrence of cracks at the connection points between the spring portion 30 and the inner circumferential cylindrical portion 33 of the spring portion 30 or the sleeve holding portion 40.
[0048] Furthermore, as described above, the transition portion 32a of the outer peripheral cylindrical portion 32 of the spring portion 30 is located on the support side in the axial x direction compared to the stopper surface 23 of the stopper portion 20, and an outer peripheral space G1 exists between the stopper portion 20 and the spring portion 30. This makes it possible to achieve a bottom state in which the supported object 50 contacts the stopper surface 23 but does not contact the spring portion 30. Therefore, it is possible to set a limit on the movement of the supported object 50 toward the support side without the supported object 50 coming into contact with the spring portion 30. As a result, even if the supported object 50 is subjected to a large impact, the movement of the supported object 50 can be restricted without the supported object 50 coming into contact with the spring portion 30, and the stress applied to the spring portion 30 can be limited.
[0049] Furthermore, as described above, as the sleeve 2 moves toward the support side, it is possible to prevent large stresses from being generated at the outer cylindrical portion 32 of the spring portion 30 and the connection portion of the stopper portion 20 with the spring portion 30, thereby preventing large distortions from occurring. As a result, deformation of the stopper portion 20 is suppressed, preventing the edge portion between the support surface 61 and the through hole 63 of the support body 60 from digging into the contact surface 21, and preventing large stresses from being generated at the contact surface 21 of the stopper portion 20 and other parts of the stopper portion 20. Therefore, it is possible to prevent cracks from forming in the stopper portion 20.
[0050] Furthermore, as described above, the spring portion 30 has a bent portion 31, and the bent portion 31 is designed to deform in a way that allows it to bend further. Also, since the spring portion 30 has an outer cylindrical portion 32 and an inner cylindrical portion 33, when the sleeve 2 moves radially, it is possible to suppress contact and wear of the spring portion 30 against the sleeve holding portion 40 and the stopper portion 20. In this way, the mount 1 can suppress contact wear.
[0051] As described above, according to the mount 1 of the embodiment of the present invention, even if the elastic modulus of the spring portion is low, a decrease in durability can be suppressed.
[0052] Although embodiments of the present invention have been described above, the present invention is not limited to Mount 1 according to the above embodiments of the present invention, but includes all embodiments included in the concept and claims of the present invention. Furthermore, each component may be selectively combined as appropriate to achieve at least some of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be appropriately changed depending on the specific use of the present invention. [Explanation of Symbols]
[0053] 1...Mount, 2...Sleeve, 2a...Outer surface, 2b...Tip, 2c...Rear end, 3...Elastic body part, 4...Mounting groove, 10...Mounting part, 11...Tapered surface, 12...Outer surface, 13...Clamping surface, 14...Groove bottom surface, 15...Inner surface, 16...End surface, 20...Stopper part, 21...Contact surface, 22...Outer surface, 23...Stopper surface, 24...Inner surface, 25...Outer surface, 25a...Transition surface, 30...Spring part, 31...Bend part, 31a...Inner surface, 31b...Outer surface, 31c...Tip, 32...Outer cylindrical part, 32a...Transition G1...Rear section, 32b...Rising section, 32c...Outer circumference side, 33...Inner circumference cylindrical section, 33a...Transition section, 33b...Rear section, 33c...Inner circumference side, 40...Sleeve holding section, 41...Outer circumference surface, 41a...Transition surface, 50...Supported object, 51, 52...Surface, 53...Through hole, 60...Support, 61...Support surface, 62...Back surface, 63...Through hole, 70...Bolt, 71...Nut, G1...Outer circumference space, G2...Inner circumference space, G3...Spring section space, G4, G5...Space, g1...End, L1, L2, L3...Boundary line, x...Axis
Claims
1. A sleeve is a cylindrical member that extends along the axis, The sleeve is equipped with an elastic body portion formed from an elastic body, The elastic body portion has a mounting portion which is an annular part around the axis, a stopper portion which is an annular part around the axis, a spring portion which is an annular part around the axis, and a sleeve holding portion which is a portion that holds the sleeve. The stopper portion is located on one side in the axial direction relative to the mounting portion. The sleeve holding portion is located on the inner circumference side of the mounting portion and the stopper portion. The spring portion extends between the stopper portion and the sleeve holding portion and has a bent portion which is a portion that bends convexly to one side in the axial direction. The spring portion forms an annular space on its outer circumference between itself and the stopper portion, opening to one side in the axial direction, and also forms an annular space on its inner circumference between itself and the sleeve holding portion, opening to one side in the axial direction. A mount characterized in that, when one end of the sleeve holding portion and one end of the stopper portion are at the same position in the axial direction, one end of the spring portion does not protrude further in the axial direction than the one end of the stopper portion.
2. A sleeve is a cylindrical member that extends along the axis, The sleeve is equipped with an elastic body portion formed from an elastic body, The elastic body portion has a mounting portion which is an annular part around the axis, a stopper portion which is an annular part around the axis, a spring portion which is an annular part around the axis, and a sleeve holding portion which is a portion that holds the sleeve. The stopper portion is located on one side in the axial direction relative to the mounting portion. The sleeve holding portion is located on the inner circumference side of the mounting portion and the stopper portion. The spring portion extends between the stopper portion and the sleeve holding portion and has a bent portion which is a portion that bends convexly to one side in the axial direction. The spring portion forms an annular space on its outer circumference between itself and the stopper portion, opening to one side in the axial direction, and also forms an annular space on its inner circumference between itself and the sleeve holding portion, opening to one side in the axial direction. The outer peripheral portion of the spring extends from the stopper portion toward one side in the axial direction. The outer circumferential surface of the outer circumferential portion of the spring part is connected at the other end in the axial direction to the outer inner circumferential surface facing the inner circumferential side that extends from one end of the stopper part to the other end in the axial direction. The mount is characterized in that the inner surface of the outer-circumferential portion of the spring is flush with the inner surface of the inner-circumferential portion of the stopper.
3. The mount according to claim 1 or 2, characterized in that one end of the bent portion of the spring portion is located on the one side in the axial direction, more so than the one end of the stopper portion.
4. The mount according to any one of claims 1 to 3, characterized in that one end of the sleeve holding portion is located on the one side in the axial direction of the spring portion than the one end of the bent portion of the spring portion.
5. The mount according to any one of claims 2, claim 3 relating to claim 2, and claim 4 relating to claim 2, characterized in that when the one end of the sleeve holding portion and the one end of the stopper portion are in the same position in the axial direction, the one end of the spring portion does not protrude to the one side in the axial direction more than the one end of the stopper portion.
6. Distance a is the distance in the axial direction between the other end of the space that opens to one side between the spring portion and the stopper portion and the other end of the stopper portion on one side, Distance b is the distance in the axial direction between the other end of the space that opens to one side between the spring portion and the stopper portion, and the one end of the bent portion of the spring portion. The distance S, which is the distance in the axial direction between one end of the stopper portion and one end of the sleeve holding portion, The mount according to any one of claims 1 to 5, characterized in that it satisfies the relationship b < S / 2 + a.
7. The mount according to any one of claims 1 to 6, characterized in that an annular groove recessed on the inner circumference is formed between the mounting portion and the stopper portion.
8. The spring portion has an outer circumferential cylindrical portion which is a cylindrical part connected to the outer circumferential end of the bent portion, and an inner circumferential cylindrical portion which is a cylindrical part connected to the inner circumferential end of the bent portion. The thickness of the outer circumferential cylindrical portion is greater than the thickness of the inner circumferential cylindrical portion. The mount according to any one of claims 1 to 7, characterized in that the thickness of the bent portion increases from the inner end to the outer end.