Cylindrical vibration isolator for vehicle auxiliary machine

Abstract

To provide a cylindrical vibration isolator for a vehicle auxiliary machine having a novel structure which can employ a main body rubber elastic body having a low spring characteristic adapted to the vehicle auxiliary machine.SOLUTION: A cylindrical vibration isolator 10 for a vehicle auxiliary machine is provided with an inner shaft member 16 and an outer bracket 14 which are attached to the vehicle auxiliary machine 32 and a vehicle body side support member 34, respectively, and is provided with a cylindrical part 44 which is externally fit to the inner shaft member 16 at the outer bracket 14, wherein the inner member 16 and the cylindrical part 44 are connected to each other by a main body rubber elastic body 20, the inner shaft member 16 comprises a stopper protrusion 24 protruding to an external peripheral side at a position protruding from the main body rubber elastic body 20 in an axial direction, and the outer bracket 14 comprises: a first stopper part 46 having an axis perpendicular abutment face 48 which opposes the stopper protrusion 24 in an axis perpendicular angle in a position protruding from the main body rubber elastic body 20 in the axial direction; and a second stopper part 50 having an axial-direction abutment face 52 which opposes the stopper protrusion 24 in the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cylindrical vibration isolation device for vehicle accessories that supports vehicle accessories such as an electric compressor in a vibration-isolating manner. [Background technology]

[0002] Conventionally, cylindrical vibration-isolating devices for vehicle accessories that support vehicle accessories such as electric compressors on a vehicle body in a vibration-isolating manner have been known. For example, as shown in the main bush 130 of U.S. Patent No. 11,078,985 (Patent Document 1), cylindrical vibration-isolating devices for vehicle accessories have a structure in which an inner shaft member and an outer bracket having a cylindrical portion are connected by a main rubber elastic body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Pat. No. 11,078,985 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since vehicle accessories such as electric compressors are relatively lightweight and the input load to the vibration isolation device is small, cylindrical vibration isolation devices for vehicle accessories are required to have softer spring characteristics than cylindrical vibration isolation devices used in engine mounts and suspension bushings.

[0005] However, if an attempt is made to realize soft spring characteristics by reducing the spring constant of the main rubber elastomer, the deformation amount of the main rubber elastomer increases, and there is a risk that the main rubber elastomer may break due to a large load during a vehicle collision or due to deterioration of the main rubber elastomer over time. Furthermore, it is also conceivable that the large deformation or breakage of the main rubber elastomer may cause the vehicle accessories to collide with other surrounding components or the ground, resulting in damage. In recent years, awareness of environmental issues has been increasing significantly, and there are concerns about the burden on the environment if, for example, an electric compressor, which is a vehicle accessory, is damaged or the piping of the electric compressor becomes loose, resulting in the leakage of refrigerant.

[0006] An object of the present invention is to provide a cylindrical vibration-isolating device for vehicle accessories having a novel structure, which makes it possible to employ a main rubber elastic body having the low spring characteristics required for vehicle accessories. [Means for solving the problem]

[0007] The following describes preferred embodiments for understanding the present invention, but the embodiments described below are merely illustrative and may be combined with one another as appropriate, and the multiple components described in each embodiment may be recognized and used independently as far as possible, and may also be combined with any of the components described in another embodiment as appropriate. As a result, the present invention is not limited to the embodiments described below, and various other embodiments may be realized.

[0008] The first aspect is a cylindrical vibration-damping device for a vehicle accessory that supports a vehicle accessory on a support member on the vehicle body side in a vibration-damping manner, and comprises an inner axial member attached to one of the vehicle accessory and the support member, an outer bracket having a tubular portion arranged at a distance from the outer periphery of the inner axial member and attached to the other of the vehicle accessory and the support member, and a main rubber elastic body that connects the inner axial member and the tubular portion of the outer bracket, and the inner axial member is provided with a stopper protrusion that protrudes outwardly at a position protruding axially from the main rubber elastic body, and the outer bracket is provided with a first stopper portion at a position protruding axially from the main rubber elastic body, the first stopper portion having an axial abutment surface that faces the stopper protrusion at a distance perpendicular to the axis, and a second stopper portion having an axial abutment surface that faces the stopper protrusion at a distance from the axis in the axial direction.

[0009] A cylindrical vibration-damping device for vehicle accessories, which supports and damps vehicle accessories that are lighter than the vehicle main engine, is required to have softer spring characteristics (low spring characteristics) than a cylindrical vibration-damping device for a vehicle main engine. However, if the spring characteristics for normal vibration input are set low enough for vehicle accessories, the relative displacement between the vehicle accessories and the support member on the vehicle body side becomes excessively large when a large load is input, causing problems such as contact between the vehicle accessories and other surrounding members or the ground. Therefore, in a cylindrical vibration-damping device for vehicle accessories constructed according to this embodiment, the relative displacement between the inner shaft member and the outer bracket is limited by the abutment between the stopper protrusion of the inner shaft member and the first and second stopper portions of the outer bracket. This makes it possible to set the low spring characteristics required for a cylindrical vibration-damping device for vehicle accessories, while limiting the relative displacement between the vehicle accessories and the support member on the vehicle body side, thereby preventing contact between the vehicle accessories and other members or the ground.

[0010] Furthermore, if the deformation of the main rubber elastomer becomes large when a large load is input, it is possible that the main rubber elastomer may break; however, since the deformation of the main rubber elastomer is limited by the abutment of the stopper projection with the first and second stopper portions, excessive deformation of the main rubber elastomer is avoided, and breakage of the main rubber elastomer can be prevented.

[0011] Even if the main rubber elastic body breaks, the inner shaft member and the outer bracket are prevented from separating from each other by the abutment between the stopper projection of the inner shaft member and the second stopper portion of the outer bracket. This makes it possible to prevent the vehicle accessories from separating from the vehicle body and falling off, and to prevent damage to the vehicle accessories due to hitting the ground. Moreover, since the amount of relative displacement between the inner shaft member and the outer bracket in the axis-perpendicular direction is limited by the abutment between the stopper projection and the first stopper portion, it becomes difficult for the stopper projection and the second stopper portion to be released from their axial opposing state, and thus the vehicle accessories are reliably prevented from falling off the support member.

[0012] In a second aspect, in the cylindrical vibration-damping device for vehicle accessories described in the first aspect, the stopper protrusion is a flange portion that protrudes toward the outer periphery around the entire circumference of the inner shaft member, the outer bracket is provided with a cylindrical peripheral wall portion that extends cylindrically outward in the axial direction from the cylindrical portion, the first stopper portion is formed by the cylindrical peripheral wall portion, and the second stopper portion is formed by an inner flange portion that protrudes annularly from the cylindrical peripheral wall portion toward the inner circumference.

[0013] In the cylindrical vibration isolation device for vehicle accessories constructed according to this aspect, the amount of relative axial displacement between the vehicle accessory and the support member is limited by the abutment between the flange portion that is continuous around the entire circumference and the annular inner flange portion, so that a large abutment area is ensured and the stopper load is dispersed. In addition, the amount of displacement in the prying direction in which the inner shaft member and the outer bracket tilt relative to each other is also limited by the abutment between the flange portion and the inner flange portion.

[0014] In addition, since the amount of relative displacement between the vehicle accessory and the support member in the axis-perpendicular direction is limited by the abutment between the flange portion and the cylindrical peripheral wall portion, the amount of relative displacement between the inner shaft member and the outer bracket can be limited in all axis-perpendicular directions.

[0015] The third aspect is a cylindrical vibration isolation device for vehicle accessories described in the first or second aspect, in which a stopper rubber is provided between the stopper protrusion and the outer bracket, and the stopper rubber is configured to include an axial cushioning rubber arranged between the opposing surfaces of the stopper protrusion and the first stopper portion, and an axial cushioning rubber arranged between the opposing surfaces of the stopper protrusion and the second stopper portion.

[0016] In a cylindrical vibration-damping device for vehicle accessories constructed in accordance with this embodiment, the stopper rubber arranged between the stopper protrusion and the outer bracket comprises axial cushioning rubber and axial cushioning rubber, so that when the stopper protrusion abuts against the first stopper portion and when the stopper protrusion abuts against the second stopper portion, the cushioning properties of the stopper rubber reduce impact noise and shock.

[0017] A fourth aspect is a cylindrical vibration isolation device for vehicle accessories described in the third aspect, wherein the stopper rubber is formed integrally with the main rubber elastic body and fixed to the stopper protrusion of the inner shaft member.

[0018] In a cylindrical vibration isolation device for vehicle accessories constructed in accordance with the present embodiment, the stopper rubber, which includes the axial cushioning rubber and the axial cushioning rubber, is formed integrally with the main rubber elastic body and fixed to the stopper protrusion, thereby eliminating the need for a process of forming the stopper rubber separately from the main rubber elastic body, making manufacturing easier and reducing the number of parts.

[0019] A fifth aspect is the cylindrical vibration isolation device for a vehicle auxiliary machine according to any one of the first to fourth aspects, in which the vehicle auxiliary machine is an electric compressor.

[0020] According to the cylindrical vibration-damping device for vehicle accessories constructed in accordance with this embodiment, even if the vehicle accessory is an electric compressor that generates vibrations when in operation, the accessory is vibration-damping supported on a support member on the vehicle body side, thereby suppressing the transmission of vibrations to the support member.

[0021] In addition, because electric compressors are significantly lighter than main vehicle machinery such as engines, the main rubber elastic body is required to have softer spring characteristics. If an attempt was made to set the spring constant of the main rubber elastic body smaller, the main rubber elastic body would deform more when a large load was input, making it more susceptible to breakage, but because the relative displacement between the inner shaft member and the outer bracket is limited in the direction perpendicular to the axis and in the axial direction, excessive deformation of the main rubber elastic body is avoided, and interference with other components due to displacement of the electric compressor or contact with the ground due to falling off is prevented.

[0022] In addition, for example, if the electric compressor comes into contact with other members or the ground, etc. and is damaged, or if the piping of the electric compressor becomes loose, there is a risk that the refrigerant, which has a detrimental effect on the environment, will leak from the electric compressor. Therefore, by using a stopper mechanism in which the stopper protrusion of the inner shaft member abuts against the first and second stopper portions of the outer bracket, the electric compressor is prevented from coming into contact with other members or the ground, thereby preventing refrigerant leakage due to damage to the electric compressor and also preventing environmental pollution, etc.

[0023] A sixth aspect is a cylindrical vibration-damping device for vehicle accessories described in any one of the first to fifth aspects, in which an outer cylindrical member is arranged at a distance from the outer circumferential side of the inner shaft member and fixed to the main rubber elastic body, and the outer cylindrical member is press-fitted and fixed into the cylindrical portion of the outer bracket.

[0024] In the cylindrical vibration isolation device for vehicle accessories constructed according to this embodiment, the outer tubular member, which is a separate member from the outer bracket attached to the vehicle accessory or a support member on the vehicle body side, is fixed to the main rubber elastic body, so that the outer tubular member fixed to the main rubber elastic body does not need to be provided with a mounting structure for the support member on the vehicle body side. Therefore, the vulcanization molded product of the main rubber elastic body before the outer bracket is attached can be made smaller, improving production efficiency.

[0025] A seventh aspect is a cylindrical vibration-damping device for vehicle accessories described in any one of the first to sixth aspects, wherein the central axis of the inner shaft member extends in the vertical direction of the vehicle, the vehicle accessory is attached to the lower side of the inner shaft member, and the outer bracket is attached to the support member above the vehicle accessory.

[0026] According to the cylindrical vibration-damping device for vehicle accessories constructed in accordance with the present embodiment, the vehicle accessory is supported in a suspended state, and therefore, when the main rubber elastic body breaks, gravity will cause the vehicle accessory to displace downward relative to the vehicle body. However, the abutment between the stopper protrusion and the second stopper portion prevents the vehicle accessory from separating from the vehicle body and falling off.

[0027] An eighth aspect is a cylindrical vibration-damping device for a vehicle auxiliary machine according to any one of the first to seventh aspects, wherein the stopper projection is integrally formed with the inner shaft member.

[0028] According to the cylindrical vibration-damping device for vehicle accessories having the structure according to this aspect, the number of parts can be reduced compared to a case in which the stopper projection is formed as a separate part from the inner shaft member. Effect of the Invention

[0029] According to the present invention, in a cylindrical vibration isolation device for vehicle accessories, it is possible to employ a main rubber elastic body having low spring characteristics required for vehicle accessories. [Brief description of the drawings]

[0030] [Figure 1] FIG. 5 is a vertical cross-sectional view showing a vibration-proof mount according to a first embodiment of the present invention in a state where the mount is mounted on a vehicle, the view corresponding to cross-section II of FIG. [Diagram 2] A vertical cross-sectional view of the mount body that constitutes the vibration-proof mount shown in Figure 1. [Diagram 3] FIG. 2 is a perspective view of the vibration isolation mount shown in FIG. 1 mounted on a vehicle. [Figure 4] A front view of the anti-vibration mount shown in Figure 3 when installed on a vehicle. [Diagram 5] A plan view of the vibration isolation mount shown in Figure 3 mounted on a vehicle. [Figure 6] Right side view of the anti-vibration mount shown in Figure 3 when installed on the vehicle [Figure 7] FIG. 2 is a vertical cross-sectional view of the vibration-proof mount shown in FIG. 1 when mounted on a vehicle, showing a state in which the electric compressor is displaced downward; [Figure 8] FIG. 2 is a vertical cross-sectional view of the vibration-proof mount shown in FIG. 1 when mounted on a vehicle, showing a state in which the electric compressor is displaced upward. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0032] 1 shows an anti-vibration mount 10 for an electric compressor as a first embodiment of a cylindrical anti-vibration device for vehicle accessories according to the present invention. The anti-vibration mount 10 has a structure in which an outer bracket 14 is attached to a mount body 12. In the following description, the up-down direction basically refers to the vertical up-down direction, which is the direction of the mount's central axis, as viewed in FIG.

[0033] As shown in Figure 2, the mount body 12 has an inner shaft member 16 inserted into an outer cylindrical member 18, and the inner shaft member 16 and the outer cylindrical member 18 are elastically connected radially between them by a cylindrical main rubber elastic body 20.

[0034] The inner shaft member 16 is a small-diameter cylindrical member made of metal, fiber-reinforced synthetic resin, or the like, and extends linearly in the vertical direction. The inner hole of the inner shaft member 16 is a bolt hole 22 that has a circular cross section and passes through in the axial direction.

[0035] A stopper projection 24 is formed in the axial middle portion of the inner shaft member 16, projecting outward in the axially perpendicular direction. The stopper projection 24 is an annular plate-shaped flange portion, and is provided continuously around the entire circumference with a substantially constant cross-sectional shape. The stopper projection 24 is provided below the axial center of the inner shaft member 16. In this embodiment, the stopper projection 24 is formed integrally with the inner shaft member 16, but for example, a circular plate-shaped stopper projection may be provided as a separate part from the inner shaft member, and the stopper projection may be provided by fitting externally onto the outer circumferential surface of the inner shaft member.

[0036] The outer cylindrical member 18 is formed from metal, fiber-reinforced synthetic resin, or the like, and has a generally cylindrical shape that is thin-walled and large in diameter compared to the inner shaft member 16. The outer cylindrical member 18 of this embodiment extends straight in the axial direction with generally constant inner and outer diameters. The axial length of the outer cylindrical member 18 is smaller than the axial length of the inner shaft member 16, and is preferably less than half, and more preferably less than 1 / 3, of the inner shaft member 16.

[0037] The inner shaft member 16 is inserted into the inner periphery of the outer cylindrical member 18. The upper and lower ends of the inner shaft member 16 protrude outward from the outer cylindrical member 18, and the inner shaft member 16 is disposed so as to protrude downward from the outer cylindrical member 18 more than upward. The stopper projection 24 of the inner shaft member 16 is positioned downwardly and spaced apart from the outer cylindrical member 18.

[0038] The inner shaft member 16 and the outer tubular member 18, which are disposed in an internally and externally inserted state as described above, are connected to each other by a main rubber elastic body 20. The main rubber elastic body 20 is shaped as an upside-down truncated cone whose diameter decreases downward as a whole, and its inner peripheral end is vulcanization bonded to the inner shaft member 16, while its outer peripheral end is vulcanization bonded to the outer tubular member 18.

[0039] The stopper protrusion 24 of the inner shaft member 16 is provided at a position protruding downward from the main rubber elastic body 20, and the lower end of the main rubber elastic body 20 is fixed to the upper surface of the stopper protrusion 24. The stopper protrusion 24 is covered by a first stopper rubber 26 as a stopper rubber. The first stopper rubber 26 includes an axial buffer rubber 28 that covers the outer peripheral surface of the stopper protrusion 24, which is the surface facing the axial abutment surface 48 described later, and an axial buffer rubber 30 that covers the lower surface of the stopper protrusion 24, which is the surface facing the axial abutment surface 52 described later. The first stopper rubber 26 of this embodiment is integrally formed with the main rubber elastic body 20, and is vulcanization bonded to the inner shaft member 16 together with the main rubber elastic body 20. In this embodiment, the axial buffer rubber 28 is thicker than the axial buffer rubber 30. The first stopper rubber 26 is integrally continuous with the main rubber elastic body 20 at the upper end of the axial buffer rubber 28. The first stopper rubber 26 protrudes slightly downward from the inner peripheral end of the axial buffer rubber 30 and is fixed to the outer peripheral surface of the inner shaft member 16 below the stopper projection 24 .

[0040] The mount body 12 thus constructed is interposed between an electric compressor 32, which serves as a vehicle accessory, and an outer bracket 14 fixed to a support member 34 on the vehicle body side, as shown in Fig. 1. That is, the mount body 12 is mounted on the vehicle by attaching the inner shaft member 16 to the electric compressor 32 and attaching the outer cylindrical member 18 to the outer bracket 14 fixed to the support member 34. When the mount body 12 is mounted on the vehicle, the electric compressor 32 is vibration-isolated connected to the support member 34 on the vehicle body side via the vibration-isolation mount 10, as shown in Figs. 3 to 6.

[0041] In this embodiment, as shown in Figures 3 and 5, the electric compressor 32 is connected in a vibration-proof manner to a support member 34 on the vehicle body side by three mount bodies 12, 12, 12, but in the following explanation, only the vehicle-mounted state of one mount body 12 will be explained, and the explanation of the other two will be omitted since they are similar. Note that in this embodiment, the three mount bodies 12, 12, 12 are attached to one outer bracket 14, but each mount body 12 and outer bracket 14 in combination constitutes an anti-vibration mount 10, so that the electric compressor 32 is supported in a vibration-proof manner by three anti-vibration mounts 10, 10, 10, as shown in Figure 5.

[0042] As shown in Fig. 1, the lower end surface of the inner shaft member 16 is placed on the upper surface of a fastening portion 38 protruding from a housing 36 of the electric compressor 32, and the inner shaft member 16 is bolted to the electric compressor 32 by a bolt 40 inserted through a bolt hole 22 of the inner shaft member 16 and a bolt hole 22 passing vertically through the fastening portion 38. In Fig. 5, the inner shaft member 16 and the fastening portion 38 of the electric compressor 32 are fastened to each other by a nut 42 being screwed onto the bolt 40, but for example, the bolt 40 may be screwed into a screw hole formed in the fastening portion 38. The housing 36 of the electric compressor 32 is hollow and cylindrical, and a compressor main body (not shown) is housed therein.

[0043] The outer tubular member 18 is press-fitted and fixed to a tubular portion 44 provided on the outer bracket 14. In this embodiment, the outer tubular member 18, which is bonded by vulcanization to the main rubber elastic body 20, and the outer bracket 14, which is fixed to the support member 34 on the vehicle body side, are separate parts, and by press-fitting the outer tubular member 18 into the outer bracket 14, the tubular portion 44 of the outer bracket 14 is disposed at a distance from the outer periphery of the inner shaft member 16, and the inner shaft member 16 and the tubular portion 44 of the outer bracket 14 are mutually connected by the main rubber elastic body 20. With such a structure in which the outer tubular member 18 and the outer bracket 14 are separate parts, the mount body 12, which is an integrally vulcanized molded product of the main rubber elastic body 20, can be made smaller. Note that the vibration-proof mount 10 of this embodiment has a structure in which the outer bracket 14 is attached to the mount body 12.

[0044] Further, the outer bracket 14 is provided with a cylindrical peripheral wall portion 46 that protrudes downward from the cylindrical portion 44, and the cylindrical peripheral wall portion 46 extends downward further than the stopper projection 24 of the inner shaft member 16. The cylindrical peripheral wall portion 46 as a first stopper portion surrounds the outer periphery of the stopper projection 24, and an inner periphery surface that faces the outer periphery surface of the stopper projection 24 in the radial direction serves as a shaft abutment surface 48.

[0045] The lower end of the cylindrical peripheral wall portion 46 is provided with an inner flange portion 50 as a second stopper portion that protrudes annularly inward around the entire circumference. The inner flange portion 50 is located below the stopper projection 24 of the inner shaft member 16, and the inner peripheral end faces the stopper projection 24 in the up-down direction, and is spaced outward from the lower portion of the inner shaft member 16 below the stopper projection 24. In the vibration-proof mount 10, the axial buffer rubber 30 that covers the lower surface of the stopper projection 24 of the inner shaft member 16 faces the inner flange portion 50 of the outer bracket 14 at a predetermined stopper clearance above. In addition, the axial buffer rubber 28 that covers the outer peripheral surface of the stopper projection 24 faces the inner peripheral surface of the cylindrical peripheral wall portion 46 at a predetermined stopper clearance on the inner circumference. The inner flange portion 50 has an upper surface that faces the lower surface of the stopper projection 24 in the vertical direction and serves as an axial contact surface 52 .

[0046] A second stopper rubber 54 is fixed to the underside of the inner flange-shaped portion 50. The second stopper rubber 54 is annular, and is superimposed on the underside of the inner circumferential end portion of the inner flange-shaped portion 50. When the vibration-proof mount 10 is installed on the vehicle, the underside of the second stopper rubber 54 faces the fastening portion 38 of the electric compressor 32 above and separated by a specified stopper clearance.

[0047] The mount body 12 is attached to the vehicle with the central axis of the inner shaft member 16 oriented in a direction extending in the vehicle up-down direction, the electric compressor 32 is attached to the lower side of the inner shaft member 16, and the outer bracket 14 is attached to a support member 34 above the electric compressor 32. Therefore, the electric compressor 32 is supported in a vibration-proof manner in a suspended state via the vibration-proof mount 10 relative to the support member 34 on the vehicle body side.

[0048] When vibrations due to the operation of the electric compressor 32 or the like are input between the inner shaft member 16 and the outer cylindrical member 18 with the vibration-proof mount 10 thus installed in the vehicle, the intended vibration-proofing effect is achieved by the vibration insulating and vibration damping effects that occur when the main rubber elastic body 20 elastically deforms. During normal vibration input as shown in Fig. 6, the first stopper rubber 26 covering the stopper projection 24 is held in a state spaced apart from the cylindrical peripheral wall portion 46 and the inner flange-like portion 50 of the outer bracket 14. During normal vibration input, the fastening portion 38 of the electric compressor 32 is held in a state spaced apart downward from the second stopper rubber 54 covering the lower surface of the inner flange-like portion 50 of the outer bracket 14.

[0049] As shown in Fig. 7, when the electric compressor 32 is significantly displaced downward relative to the support member 34 on the vehicle body side, the stopper projection 24 of the inner shaft member 16 fixed to the electric compressor 32 comes into contact in the up-down direction with the axial abutment surface 52 of the inner flange-like portion 50 of the outer bracket 14 via the axial buffer rubber 30 of the first stopper rubber 26. This forms a first stopper mechanism 56 that limits the amount of downward relative displacement of the inner shaft member 16 with respect to the outer cylindrical member 18, thereby limiting the downward displacement of the electric compressor 32 with respect to the support member 34. This prevents the electric compressor 32 from hitting the ground or other surrounding members, thereby preventing damage to the electric compressor 32 and other members.

[0050] 7 shows an example in which the first stopper mechanism 56 is configured in a state in which the inner shaft member 16 and the outer cylindrical member 18 are connected by the main rubber elastic body 20, but even if, for example, an impactful large load causes the main rubber elastic body 20 to break and the connection between the inner shaft member 16 and the outer cylindrical member 18 by the main rubber elastic body 20 is released, the electric compressor 32 falls downward, thereby configuring the first stopper mechanism 56. Therefore, even when the main rubber elastic body 20 breaks, the first stopper mechanism 56 prevents the electric compressor 32 from falling downward.

[0051] In addition, when the electric compressor 32 is largely displaced radially relative to the support member 34 on the vehicle body side, the stopper protrusion 24 of the inner shaft member 16 and the axially-directed abutment surface 48 of the cylindrical peripheral wall portion 46 of the outer bracket 14 come into contact with each other in the radial direction via the axially-directed buffer rubber 28. This forms a second stopper mechanism 58 that limits the amount of relative displacement between the inner shaft member 16 and the outer cylindrical member 18 in the radial direction, thereby limiting the radial displacement of the electric compressor 32 relative to the support member 34. This prevents the electric compressor 32 from hitting the outer bracket 14 or other surrounding members, and prevents damage to the electric compressor 32, the outer bracket 14, other surrounding members, etc. In this embodiment, the stopper protrusion 24 and the cylindrical peripheral wall portion 46 are provided continuously around the entire circumference, so that the second stopper mechanism 58 is formed in all radial directions.

[0052] 8, when the electric compressor 32 is displaced significantly upward relative to the support member 34 on the vehicle body side, the fastening portion 38 of the electric compressor 32 comes into contact with the inner flange-like portion 50 of the outer bracket 14 in the vertical direction via the second stopper rubber 54. This forms a third stopper mechanism 60 that limits the amount of upward relative displacement of the inner shaft member 16 with respect to the outer cylindrical member 18, thereby limiting the upward displacement of the electric compressor 32 with respect to the support member 34. This prevents the electric compressor 32 from hitting the outer bracket 14, and prevents damage to the electric compressor 32 and the outer bracket 14.

[0053] In addition, like the first stopper mechanism 56, the second stopper mechanism 58 and the third stopper mechanism 60 limit the amount of relative displacement between the inner shaft member 16 and the outer cylindrical member 18 even when the main rubber elastic body 20 breaks.

[0054] As described above, the anti-vibration mount 10 according to this embodiment limits the amount of relative displacement of the electric compressor 32 with respect to the vehicle body (support member 34) when a large load is input, thereby making it possible to prevent damage to the electric compressor 32, for example, due to hitting other members, the ground, etc. In particular, since the electric compressor 32 used in a vehicle air conditioner or the like has a refrigerant flowing inside, if it hits other members or the ground and is damaged, there is a risk that the refrigerant leaking out will pollute the surrounding environment; however, by employing the anti-vibration mount 10 according to this embodiment, damage to the electric compressor 32 is prevented, making it possible to prevent environmental pollution due to refrigerant leakage.

[0055] Since the electric compressor 32, which is an auxiliary vehicle component, is significantly lighter than the main vehicle engine (engine, etc.), the main rubber elastic body 20 is required to have spring characteristics softer than those of the main rubber elastic body of a cylindrical vibration isolation device for vehicle attachment, such as an engine mount. However, if the spring constant of the main rubber elastic body 20 is set smaller, the main rubber elastic body 20 will deform more when a large load is input, and will be more likely to break. Therefore, by providing the vibration isolation mount 10 with first to third stopper mechanisms 56, 58, 60 that limit the relative displacement between the inner shaft member 16 and the outer bracket 14 in the axial direction and the axial perpendicular direction, respectively, excessive deformation and associated damage of the main rubber elastic body 20 are avoided, and the electric compressor 32 is prevented from hitting other components, the ground, etc.

[0056] In this embodiment, the anti-vibration mount 10 is attached to the vehicle with the central axis of the inner shaft member 16 oriented so as to extend in the vertical direction of the vehicle, the electric compressor 32 is attached to the lower side of the inner shaft member 16, and the outer bracket 14 is attached to the support member 34 above the electric compressor 32. In such a structure in which the electric compressor 32 is supported by the anti-vibration mount 10 in a suspended state, for example, when the main rubber elastic body 20 breaks, the inner shaft member 16 will be displaced axially downward relative to the outer bracket 14 due to gravity, but in such a case, the first stopper mechanism 56 will prevent the electric compressor 32 from falling off.

[0057] In the vibration-proof mount 10, the stopper projection 24 constituting the first and second stopper mechanisms 56, 58 is a flange portion provided continuously over the entire circumference. This allows a large contact area between the stopper projection 24 and the inner flange portion 50 in the first stopper mechanism 56, and reduces the impact sound by dispersing the stopper load and improves the durability of the axial buffer rubber 30. In addition, since the second stopper mechanism 58 can be configured over the entire circumference, the amount of relative displacement between the inner shaft member 16 and the outer tubular member 18 can be limited for any radial input, and there is no need to position the circumferential direction when mounting the mount body 12 on the vehicle, making the mounting work on the vehicle easier. Even when the inner shaft member 16 and the outer tubular member 18 are displaced relative to each other in the twisting direction, the amount of relative displacement can be limited by the contact between the stopper projection 24 and the inner flange portion 50.

[0058] In both the first and second stopper mechanisms 56, 58, the first stopper rubber 26 is interposed between the abutment surfaces of the stopper projection 24 and the outer bracket 14, thereby reducing the impact and sound generated when the stopper projection 24 and the outer bracket 14 come into contact with each other. In this embodiment, the first stopper rubber 26 is integrally formed with the main rubber elastic body 20, thereby reducing the number of parts. In addition, in the third stopper mechanism 60, the second stopper rubber 54 is interposed between the abutment surfaces of the fastening portion 38 of the electric compressor 32 and the outer bracket 14, thereby reducing the impact and sound generated when the fastening portion 38 and the outer bracket 14 come into contact with each other.

[0059] Although the embodiments of the present invention have been described above in detail, the present invention is not limited to the specific description. For example, the stopper projection, the first stopper portion, and the second stopper portion may be provided in any manner as long as they exert the intended function of restricting the deformation amount of the main rubber elastic body by abutting in the axial direction or the axis-perpendicular direction, and may not necessarily be provided continuously around the entire circumference, but may be provided partially in the circumferential direction. When the stopper projection is provided partially in the circumferential direction, it is desirable that the stopper projection is provided to protrude on at least one radial side so that an axis-perpendicular stopper mechanism (second stopper mechanism 58) is formed on at least one radial side.

[0060] In addition, although the specific shape and size of the stopper projection 24 are not limited, in consideration of the influence of the main rubber elastic body 20 on the vibration-proofing characteristics, etc., it is desirable that the tip diameter of the stopper projection 24 is smaller than the outer diameter dimension of the main rubber elastic body 20. Furthermore, in consideration of the support mode and structure of the electric compressor (vehicle accessory) 32, it is also possible to configure the third stopper mechanism 60 using the stopper projection 24. Specifically, for example, a radially inward convex portion that is located at the axial end of the outer cylindrical member 18 and protrudes toward the inner periphery side may be formed, and a third stopper mechanism may be configured that exerts the effect of limiting the axial deformation amount of the main rubber elastic body 20 and preventing the inner shaft member 16 from coming off in the axial direction from the outer cylindrical member 18 when the main rubber elastic body 20 breaks by forming the radially inward convex portion by the abutment action of the stopper projection 24 against the radially inward convex portion.

[0061] In the above embodiment, an example was shown in which the main rubber elastic body 20 is fixed to the outer tubular member 18, and the outer tubular member 18 is pressed into and fixed to the outer bracket 14, thereby elastically connecting the inner shaft member 16 and the outer bracket 14 via the main rubber elastic body 20. However, for example, the main rubber elastic body 20 may be directly fixed to the inner surface of the tubular portion 44 of the outer bracket 14.

[0062] When multiple mount bodies are attached to the outer bracket 14 as in the above embodiment, it is sufficient that at least one mount body constitutes a cylindrical vibration-damping device according to the present invention, and it is not necessary that all mount bodies constitute cylindrical vibration-damping devices according to the present invention. Note that one mount body may be attached to one outer bracket.

[0063] The third stopper mechanism 60 exemplified in the above embodiment is not essential to the cylindrical vibration isolation device according to the present invention and may be omitted, as is apparent from the fact that the electric compressor 32 is a component part of the device. Also, a stopper mechanism that corresponds to the third stopper mechanism 60 and limits the amount of upward displacement of the inner shaft member 16 relative to the outer bracket 14 may be provided in the cylindrical vibration isolation device.

[0064] In the above embodiment, the first stopper rubber 26 is fixed to the surface of the stopper protrusion 24, but the stopper rubber may be disposed between the opposing surfaces of the stopper protrusion 24 and the outer bracket 14. For example, the stopper rubber may be provided unfixed to both the stopper protrusion 24 and the outer bracket 14, or may be fixed to the outer bracket 14. Specifically, for example, the stopper rubber may be fixed to the inner peripheral surface (axial abutment surface 48) of the cylindrical peripheral wall portion 46 of the outer bracket 14 and the upper surface (axial abutment surface 52) of the inner flange-like portion 50. In this case, the stopper rubber is separate from the main rubber elastic body 20, and may be formed integrally with the second stopper rubber 54 fixed to the lower surface of the inner flange-like portion 50, for example.

[0065] The vehicle accessory is not limited to the exemplified electric compressor 32. However, it is desirable that the vehicle accessory be lighter than the main vehicle engine (internal combustion engine or the like) that provides the driving force for the vehicle. [Explanation of symbols]

[0066] 10 Anti-vibration mount (Cylindrical anti-vibration device for vehicle accessories, first embodiment) 12 Mount body 14 Outer bracket 16 Inner shaft member 18 Outer cylindrical member 20 Main rubber elastic body 22 Bolt holes 24 Stopper protrusion 26 First stopper rubber (stopper rubber) 28 Axle straight shock absorber rubber 30 Axial shock absorber rubber 32 Electric Compressor 34 Support member 36 Housing 38 Fastening Part 40 Volts 42 Nut 44 Cylindrical section 46 Cylindrical peripheral wall portion (first stopper portion) 48 Axis direct contact surface 50 Inner flange portion (second stopper portion) 52 Axial contact surface 54 Second stopper rubber 56 First stopper mechanism 58 Second stopper mechanism 60 Third stopper mechanism

Claims

1. A cylindrical vibration isolation device for a vehicle accessory that supports the vehicle accessory on a support member on a vehicle body side in a vibration isolation manner, an inner shaft member attached to one of the vehicle accessory and the support member; an outer bracket including a cylindrical portion disposed on an outer circumferential side of the inner shaft member at a distance therefrom, the outer bracket being attached to the other of the vehicle accessory and the support member; a main rubber elastic body connecting the inner shaft member and the cylindrical portion of the outer bracket; It is equipped with The inner shaft member is provided with a stopper projection that projects outward from the main rubber elastic body in the axial direction, and The outer bracket is provided with a first stopper portion at a position protruding axially from the main rubber elastic body, the first stopper portion having an axial abutment surface that faces the stopper protrusion at a distance perpendicular to the axis, and a second stopper portion having an axial abutment surface that faces the stopper protrusion at a distance in the axial direction.This cylindrical vibration-damping device for vehicle accessories.

2. The stopper projection is a flange portion that projects outwardly from the inner shaft member over the entire circumference thereof, The outer bracket is provided with a cylindrical peripheral wall portion extending axially outward from the cylindrical portion, and the first stopper portion is configured by the cylindrical peripheral wall portion.

2. A cylindrical vibration-isolating device for vehicle accessories according to claim 1, wherein said second stopper portion is constituted by an inner flange-like portion that protrudes annularly from said cylindrical peripheral wall portion toward an inner circumference.

3. A stopper rubber is provided between the stopper protrusion and the outer bracket, 3. A cylindrical vibration-damping device for vehicle accessories as described in claim 1 or 2, wherein the stopper rubber includes an axial cushioning rubber arranged between the opposing surfaces of the stopper protrusion and the first stopper portion, and an axial cushioning rubber arranged between the opposing surfaces of the stopper protrusion and the second stopper portion.

4. 3. The cylindrical vibration-isolating device for vehicle accessories according to claim 1, wherein the stopper rubber is formed integrally with the main rubber elastic body and fixed to the stopper projection of the inner shaft member.

5. 3. The cylindrical vibration isolation device for a vehicle auxiliary machine according to claim 1, wherein the vehicle auxiliary machine is an electric compressor.

6. an outer tubular member is provided which is disposed on an outer peripheral side of the inner shaft member and spaced apart from the inner tubular member and which is fixed to the main rubber elastic body; 3. A cylindrical vibration-isolating device for vehicle accessories according to claim 1, wherein the outer cylindrical member is press-fitted and fixed to the cylindrical portion of the outer bracket.

7. The central axis of the inner shaft member extends in the vehicle vertical direction, The vehicle accessory is attached to a lower side of the inner shaft member, 3. A cylindrical vibration isolation device for vehicle accessories according to claim 1, wherein said outer bracket is attached to said support member above said vehicle accessories.

8. 3. A cylindrical vibration-isolating device for vehicle accessories according to claim 1, wherein the stopper projection is integrally formed with the inner shaft member.

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