cylindrical support

Abstract

Provided is a cylindrical support of a novel structure that can achieve an improvement in durability against a large load input to an axially separated side of an inner member and an outer cylinder member, and further achieve an improvement in a degree of freedom in tuning characteristics against a load input to an axially close side. In a cylindrical support (10) in which an inner member (12) and an outer cylinder member (14) are connected by a cylindrical main body rubber elastic body (16), the inner member is provided with a cup-shaped member (44) that is open toward the main body rubber elastic body, an end portion of the main body rubber elastic body on one axial side is inserted and fitted into the cup-shaped member, a bottom wall (46) of the cup-shaped member overlaps an end surface of the main body rubber elastic body on one axial side in a non-bonding manner, a peripheral wall (48) of the cup-shaped member is flared toward the open side, and the peripheral wall has, at least in an open portion, a deformation limiting portion (56) that is externally inserted with a gap (58) in a state of being separated from the outer periphery of the main body rubber elastic body.

Description

Technical Field

[0001] This invention relates to cylindrical brackets suitable for engine room brackets, power unit brackets, and the like in motor vehicles. Background Technology

[0002] Cylindrical supports, in which the internal components and the outer cylindrical components are connected by a cylindrical main body rubber elastomer, have been known for a long time. For example, Japanese Patent Application Publication No. 2018-071768 (Patent Document 1) has the following structure: a plate-shaped first mounting member constituting the internal component is fixedly mounted on one end face of the cylindrical main body rubber elastomer along its axial direction, and a second mounting member (outer cylindrical component) is fixedly mounted on the outer peripheral surface of the main body rubber elastomer.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-071768 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in the construction of Patent Document 1, when a large load is applied to the first mounting member in the axial direction separating from the second mounting member, tensile stress is sometimes generated in the main rubber elastomer. Therefore, for example, in cases where a large load is assumed to be applied in the separation direction between the first and second mounting members, it is preferable to further improve durability.

[0008] Furthermore, even when loads are input between the first and second mounting members in a direction approaching each other axially, it is sometimes necessary to achieve good vibration damping performance, for example, through the low elasticity characteristics in the initial stage when the input load is relatively small, and to limit the compression of the main rubber elastomer (including a stopping effect), through high dynamic elasticity when the input load is large. Therefore, for load inputs to the first and second mounting members in the approach direction, it is preferable to further improve the tuning freedom of the characteristics corresponding to the input load.

[0009] The problem solved by the present invention is to provide a novel cylindrical support structure that can improve durability against large load inputs to the axially separated side of the inner and outer cylindrical components, and further improve the tuning freedom of the characteristics against load inputs to the axially approaching side.

[0010] means for solving problems

[0011] Hereinafter, preferred embodiments for mastering the present invention will be described. However, the embodiments described below are merely illustrative and can be appropriately combined with each other. Furthermore, the various constituent elements described in each embodiment can be identified and used as independently as possible, and can also be appropriately combined with any constituent elements described in other embodiments. Therefore, the present invention is not limited to the embodiments described below, and various other embodiments can be implemented.

[0012] In the first embodiment, in a cylindrical support consisting of an inner component and an outer component connected by a cylindrical main body rubber elastomer, the inner component has a cup-shaped component that opens toward the main body rubber elastomer. An axial end of the main body rubber elastomer is inserted into the cup-shaped component. The bottom wall of the cup-shaped component overlaps with the axial end face of the main body rubber elastomer in a non-adhesive manner. The peripheral wall of the cup-shaped component expands toward the opening side. The peripheral wall, at least at the opening portion, becomes a deformation-limiting portion that is gapped outward relative to the main body rubber elastomer in a state of separation toward the outer periphery.

[0013] By constructing a cylindrical support using this method, and by making the bottom wall of the cup-shaped member non-adhesive to the main rubber elastomer, the durability of the main rubber elastomer can be improved by axial input (tensile input) relative to the side where the inner member and the outer cylinder member are separated.

[0014] By making the peripheral wall of the cup-shaped member open, the gap between the bottom side of the peripheral wall and the main rubber elastomer is small. The deformation of the main rubber elastomer is constrained by the bottom side of the peripheral wall, thereby ensuring appropriate initial elasticity. In addition, on the open side of the peripheral wall, deformation of the main rubber elastomer is allowed to a certain extent to obtain an initial low elasticity characteristic. Furthermore, the deformation of the main rubber elastomer is limited by the abutment of the deformation limiting part. Therefore, two-stage elasticity characteristics (inputting initial low elasticity and inputting later high elasticity) can be achieved, or the durability of the main rubber elastomer can be improved by the stopping action.

[0015] The second method is based on the cylindrical support described in the first method, wherein the peripheral wall of the cup-shaped member becomes a stepped cylindrical shape with a step in the middle, the portion of the peripheral wall closer to the opening side than the step becomes the deformation limiting portion, and the portion of the peripheral wall closer to the bottom side than the step becomes the approach portion closer to the outer peripheral surface of the main rubber elastomer than the deformation limiting portion.

[0016] According to the cylindrical support structure described herein, the initial elastic force can be tuned at the approach portion using the peripheral wall of the stepped cylindrical cup-shaped member, while the deformation limiting portion restricts the deformation of the main rubber elastomer. Furthermore, depending on the size of the step provided on the peripheral wall of the cup-shaped member, the aforementioned elastic force can be tuned easily and with high precision.

[0017] The third approach is based on the cylindrical support described in the first or second approach, wherein the deformation limiting portion of the cup-shaped member becomes a tapered shape with a larger diameter from the bottom side toward the opening side.

[0018] According to the cylindrical support constructed in this way, the deformation-limiting portion of the peripheral wall of the cup-shaped member becomes conical, thereby facilitating the installation of the cup-shaped member onto the main rubber elastomer. Furthermore, the distance between the deformation-limiting portion and the outer peripheral surface of the main rubber elastomer can be adjusted according to the conical angle of the deformation-limiting portion.

[0019] The fourth method is based on the cylindrical support described in any of the first to third methods, wherein a flange-shaped stop portion protruding outward is provided at the open end of the cup-shaped member, and the stop portion is axially opposed to the mounting plate portion provided on the outer cylindrical member.

[0020] The cylindrical support constructed using this method not only provides a stopping function for the deformation limiting part, but also provides a stopping function based on the contact between the stopping part and the mounting plate part, thus achieving a multi-stage stopping function (elastic characteristics).

[0021] The fifth method is based on the cylindrical support described in any of the first to fourth methods, wherein a groove is formed in the main rubber elastomer, the groove opening at one end face of the axial direction that overlaps with the bottom wall of the cup-shaped member, and the end of the groove opening on the outer peripheral surface of the main rubber elastomer.

[0022] According to the cylindrical support constructed in this way, abnormal noise can be prevented when the cup-shaped component and the main rubber elastomer separate from each other due to axial input or come into contact from the separated state.

[0023] The sixth method is based on the cylindrical bracket described in the fifth method, wherein the bottom end of the peripheral wall becomes an assembly part that overlaps with the outer peripheral surface of the main rubber elastomer, and the groove depth dimension of the end of the groove that opens on the outer peripheral surface of the main rubber elastomer is greater than the axial height dimension of the assembly part.

[0024] The cylindrical bracket constructed in this manner can prevent the outer peripheral opening of the groove from being blocked by the assembly part, thereby achieving a stable effect of preventing abnormal noise.

[0025] The seventh method involves fixing a shaft member to the inner circumferential surface of the main rubber elastomer on the basis of the cylindrical support described in any of the first to sixth methods, and forming the internal component by fixing the cup-shaped component to the shaft member.

[0026] According to the cylindrical support constructed in this way, by fixing the cup-shaped member to the shaft member that is fixedly installed on the main rubber elastomer, even if the cup-shaped member is installed on the main rubber elastomer in a non-adhesive manner, it is possible to prevent, for example, the cup-shaped member from falling off the main rubber elastomer or shifting in position during transportation or storage.

[0027] The eighth method is based on the cylindrical support described in the seventh method, wherein the cup-shaped member is fixed to the shaft member, and the main rubber elastomer is pre-compressed between the cup-shaped member and the outer cylindrical member.

[0028] According to the cylindrical support constructed using this method, by fixing the cup-shaped member to the shaft member, the cup-shaped member, which is installed on the main rubber elastomer in a non-adhesive manner, pre-compresses the main rubber elastomer. Furthermore, by pre-compressing the main rubber elastomer, for example, separation between the main rubber elastomer and the bottom wall of the cup-shaped member is less likely to occur during tensile input, thus preventing abnormal noise.

[0029] The ninth embodiment is based on the cylindrical support described in the seventh or eighth embodiment, in which a groove is formed in the main rubber elastomer, the groove opening at one end face of the axial direction overlapping the bottom wall of the cup-shaped member, the groove being configured to include: an annular groove extending annularly around the shaft member; and an outer peripheral groove extending from the annular groove toward the outer periphery and opening on the outer peripheral surface of the main rubber elastomer.

[0030] The cylindrical bracket constructed using this method can more effectively prevent abnormal noises through the groove having an annular groove and an outer peripheral groove. Furthermore, when the main rubber elastomer is vulcanized and bonded to the shaft member, by overlapping the molding die for the main rubber elastomer with the shaft member within the annular groove, the mold can be used to define the fixed installation range of the main rubber elastomer relative to the shaft member.

[0031] Invention Effects

[0032] According to the present invention, in the cylindrical support, it is possible to improve the durability against large load inputs to the axially separated side of the inner member and the outer cylinder member, and to further improve the tuning freedom of the characteristics against load inputs to the axially approaching side. Attached Figure Description

[0033] Figure 1This is a cross-sectional view showing the control room support as a first embodiment of the present invention, which is equivalent to... Figure 2 Diagram of section II.

[0034] Figure 2 yes Figure 1 The top view of the operator's cab support shown.

[0035] Figure 3 yes Figure 1 The diagram shows an exploded perspective view of the control room support structure.

[0036] Figure 4 It means to Figure 1 The diagram shows a longitudinal sectional view of the control room support under axial compressive load.

[0037] Explanation of reference numerals in the attached figures

[0038] 10: Control room support frame (cylindrical support frame);

[0039] 12: Internal components;

[0040] 14: Outer cylinder components;

[0041] 16: Main body rubber elastomer;

[0042] 18: Shaft components;

[0043] 20: Tubular part;

[0044] 22: Mounting plate section;

[0045] 24: Inner convex flange-like part;

[0046] 26: lower part;

[0047] 28: One-piece vulcanized molded product;

[0048] 30: upper part;

[0049] 32: Inclined outer circumferential surface;

[0050] 34: Cushioning rubber;

[0051] 36: Groove;

[0052] 38: Annular groove;

[0053] 40: Peripheral groove;

[0054] 42: Upper protrusion;

[0055] 44: Cup-shaped component;

[0056] 46: Bottom wall;

[0057] 48: Zhou Bi;

[0058] 50: Connecting cylinder section;

[0059] 52: Steps;

[0060] 54: Approach section (assembly section);

[0061] 56: Deformation restriction part;

[0062] 58: Gap;

[0063] 60: Stop section;

[0064] 62: Control room;

[0065] 64: Framework. Detailed Implementation

[0066] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0067] exist Figure 1 , Figure 2 In this paper, a first embodiment of a cylindrical bracket constructed according to the present invention is shown: a cab bracket 10 for a motor vehicle. The cab bracket 10 has a structure in which a main rubber elastomer 16 is disposed between an inner member 12 and an outer cylindrical member 14. In the following description, in principle, the vertical direction refers to the axial direction of the bracket, i.e. Figure 1 The up and down directions in the middle.

[0068] The internal component 12 includes a shaft member 18. The shaft member 18 is a generally cylindrical shape with a small diameter and extends linearly in the vertical direction. The shaft member 18 is formed, for example, from a metal such as iron or aluminum alloy, or from a fiber-reinforced synthetic resin.

[0069] An outer cylindrical member 14 is arranged to surround the outer periphery of the shaft member 18. The outer cylindrical member 14 integrally includes a generally cylindrical cylindrical portion 20 and a mounting plate portion 22 protruding outward from the upper end of the cylindrical portion 20. The cylindrical portion 20 is generally cylindrical in shape with an inner diameter larger than the outer diameter of the shaft member 18, and an inner flange portion 24 protruding inward is integrally formed at its lower end. In this embodiment, the mounting plate portion 22 is generally circular in shape and has a generally constant structure around its circumference, but it may, for example, have mounting structures facing the vehicle body, such as double-ended bolts or bolt holes, at multiple locations in the circumferential direction. With such a mounting structure, the mounting plate portion 22 can protrude more significantly outward in the circumferential direction at the location where the mounting structure is provided. In short, the mounting plate portion 22 in this embodiment is merely an example and can be appropriately modified depending on the mounting structure facing the vehicle body, etc. Furthermore, the outer cylindrical member 14 can, for example, be obtained as a stamped part in which the cylindrical portion 20 and the mounting plate portion 22 are integrally formed.

[0070] Shaft members 18 are inserted into outer cylinder members 14, and a main rubber elastomer 16 is disposed between the shaft members 18 and the outer cylinder members 14. The main rubber elastomer 16 is cylindrical in shape, with its inner circumferential surface vulcanized and bonded to the shaft members 18, and its lower outer circumferential surface vulcanized and bonded to the cylindrical portion 20 of the outer cylinder members 14. Figure 3 As shown, the main rubber elastomer 16 is an integrally vulcanized molded product 28 having a shaft member 18 and an outer cylinder member 14.

[0071] The upper part 30 of the main body rubber elastomer 16, located above the cylindrical portion 20 of the outer cylinder member 14, is cylindrical with a diameter larger than that of the cylindrical portion 20. The outer peripheral surface of the upper part 30 is an inclined outer peripheral surface 32 with a large diameter facing downward. In this embodiment, the inclined outer peripheral surface 32 is inclined linearly at a substantially constant inclination angle, but the inclination angle of the inclined outer peripheral surface 32 can also gradually or stepwise change in the vertical direction. A ring-shaped buffer rubber 34 protruding outward is provided at the lower end of the upper part 30. By fixing the buffer rubber 34 to the upper surface of the mounting plate portion 22, a large fixed mounting area for the outer cylinder member 14 is ensured.

[0072] like Figure 1 , Figure 3 As shown, a groove 36 with an opening on the upper surface is provided at the upper end of the main rubber elastomer 16. The groove 36 opens on the outer peripheral surface of the main rubber elastomer 16. The groove 36 is composed of an annular groove portion 38 extending circumferentially at the inner peripheral end of the main rubber elastomer 16 and four outer peripheral groove portions 40, 40, 40, 40 extending radially outward from four circumferential locations of the annular groove portion 38.

[0073] The annular groove 38 extends circumferentially around the shaft member 18 disposed on the inner periphery of the main rubber elastomer 16. By providing the annular groove 38 in the main rubber elastomer 16, the upper end of the shaft member 18 is exposed from the main rubber elastomer 16.

[0074] The outer peripheral groove 40 extends linearly in the radial direction of the main body rubber elastomer 16, its inner peripheral side communicates with the annular groove 38, and its outer peripheral end opens on the outer peripheral surface of the main body rubber elastomer 16. The depth dimension of the inner peripheral portion of the outer peripheral groove 40 is approximately the same as that of the annular groove 38, and the depth dimension increases at the outer peripheral end. In this embodiment, in the stand-alone state of the cab bracket 10 before assembly into the vehicle, the depth dimension of the outer peripheral end of the outer peripheral groove 40 is larger than the axial distance between the bottom wall 46 and the step 52, and the bottom of the groove at the outer peripheral end of the outer peripheral groove 40 is located axially lower than the step 52 of the peripheral wall 48 (on the opening side of the peripheral wall 48). Preferably, even when the cab bracket 10 is assembled into the vehicle with a supporting load, the bottom of the groove at the outer peripheral end of the outer peripheral groove 40 is located axially lower than the step 52. The width dimension of the outer peripheral groove 40 is smaller than the width dimension of the annular groove 38.

[0075] like Figure 3 As shown, the upper end of the main rubber elastomer 16 is located on the outer periphery of the annular groove 38, and has four upper protrusions 42, 42, 42, 42 that are separated circumferentially by four outer peripheral grooves 40, 40, 40, 40.

[0076] like Figure 1 , Figure 3 As shown, one axial end, i.e., the upper end, of the main rubber elastomer 16 is inserted into the cup-shaped member 44 constituting the internal member 12. The cup-shaped member 44 is a rotating body with a concave cross-section opening downward toward the main rubber elastomer 16, and integrally possesses an annular plate-shaped bottom wall 46 and a cylindrical peripheral wall 48 protruding downward from the outer peripheral end of the bottom wall 46. Furthermore, the cup-shaped member 44 can be obtained, for example, by stamping a metal blank.

[0077] The bottom wall 46 of the cup-shaped member 44 has a connecting cylindrical portion 50 protruding downward from its inner periphery. The outer diameter of the connecting cylindrical portion 50 is slightly larger than the inner diameter of the shaft member 18, such as... Figure 2 As shown, the cup-shaped member 44 is fixed to the shaft member 18 by embedding into the upper opening of the shaft member 18. Thus, the cup-shaped member 44 is fixed to the shaft member 18, and the shaft member 18 and the cup-shaped member 44 constitute the inner member 12. Furthermore, by fixing the cup-shaped member 44 to the shaft member 18, the bottom wall 46 of the cup-shaped member 44 abuts against the upper surface of the main rubber elastomer 16 in a non-adhesive manner, and the main rubber elastomer 16 is pre-compressed axially between the outer cylinder member 14 and the cup-shaped member 44. The elastic characteristics of the main rubber elastomer 16 are tuned by the pre-compression of the main rubber elastomer 16. In addition, a chamfer is provided on at least one of the inner peripheral edge of the upper opening of the shaft member 18 and the outer peripheral edge of the protruding front end of the connecting cylinder portion 50 for embedding into the shaft member 18 of the connecting cylinder portion 50.

[0078] The peripheral wall 48 of the cup-shaped member 44 is a stepped cylindrical shape with a step 52 midway in the vertical direction, and is an expanding shape with a larger diameter toward the opening side. The peripheral wall 48 is an approach portion 54 with a smaller diameter than the bottom wall 46 side compared to the step 52, and is a deformation limiting portion 56 with a larger diameter than the opening side compared to the step 52. In this embodiment, the step 52 is inclined downward toward the outer periphery, but it may also extend in a substantially axially perpendicular direction, for example. Furthermore, the position of the step 52 in the depth direction of the cup-shaped member 44 can be adjusted according to the required characteristics, but in this embodiment, the step 52 is provided in the depth direction of the cup-shaped member 44 at a position closer to the bottom wall 46 than the center. By ensuring a larger volume of the gap 58, excessive deformation of the upper part 30 in the main rubber elastomer 16 can be suppressed, and a non-linear compression deformation region in the axial direction can be ensured.

[0079] The approach portion 54 forms the end of the bottom wall 46 side of the peripheral wall 48. The inner diameter of the approach portion 54 is approximately the same as the outer diameter of the upper end of the main body rubber elastomer 16, and the upper end protrusions 42, 42, 42, 42 forming the upper end of the main body rubber elastomer 16 are inserted into the approach portion 54. In this embodiment, the approach portion 54 is a conical shape corresponding to the outer peripheral surface of the upper portion 30 of the main body rubber elastomer 16, and the outer peripheral surfaces of the upper end protrusions 42, 42, 42, 42 overlap with the inner peripheral surface of the approach portion 54 with approximately zero contact, and the approach portion 54 becomes the assembly portion of this embodiment. However, the outer peripheral surfaces of the upper end protrusions 42, 42, 42, 42 can either be pressed and pressed tightly against the inner peripheral surface of the approach portion 54, or they can be separated with a gap. The groove depth dimension of the outer peripheral end of the outer peripheral groove 40 is larger than the axial height dimension of the approach portion 54. When the cup-shaped member 44 is installed on the main body rubber elastomer 16, the opening of the outer peripheral groove 40 on the outer peripheral surface of the main body rubber elastomer 16 opens into the inner periphery of the deformation limiting portion 56 at a position lower than the approach portion 54.

[0080] The deformation limiting portion 56 forms the end of the opening side of the peripheral wall 48. The inner diameter of the deformation limiting portion 56 is larger than the outer diameter of the upper part 30 of the main body rubber elastomer 16. The deformation limiting portion 56 is arranged in an externally inserted state separated from the upper part 30 of the main body rubber elastomer 16, and a gap 58 is formed between it and the main body rubber elastomer 16. The approach portion 54 is arranged closer to the outer peripheral surface of the upper part 30 of the main body rubber elastomer 16 than the deformation limiting portion 56. The deformation limiting portion 56 extends integrally downward from the outer peripheral end of the step 52. The deformation limiting portion 56 is a tapered cylinder shape with a larger diameter from the bottom wall 46 side toward the downward opening side. A flange-shaped stop portion 60 protruding outward is integrally formed at the lower end of the deformation limiting portion 56 that forms the opening end of the cup-shaped member 44. The stop portion 60 extends in a substantially axially perpendicular direction and is arranged facing upward opposite to the mounting plate portion 22 of the outer cylinder member 14. The stop portion 60 is arranged upwards relative to the cushioning rubber 34 fixed on the mounting plate portion 22.

[0081] The cab support 10 has a structure in which a cup-shaped member 44 is mounted on an integrally vulcanized molded part 28. For example, its internal member 12 is mounted to the cab 62 of a motor vehicle, which overlaps with the upper surface of the bottom wall 46 of the cup-shaped member 44, by means of mounting bolts (not shown) inserted into the internal member 12. In addition, the mounting plate portion 22 of the outer cylinder member 14 is mounted to the frame 64 of the motor vehicle by means of the above-described mounting structure (not shown). Thus, the cab support 10 is clamped between the cab 62 of the motor vehicle and the frame 64, and the cab 62 is vibration-damped relative to the frame 64.

[0082] When a tensile load (in the direction separating the control cab 62 from the frame 64) is applied to the control cab support 10, the cup-shaped member 44 of the inner member 12 of the control cab support 10 and the outer cylinder member 14 are axially separated and displaced. The cup-shaped member 44 covers the main rubber elastomer 16 in a non-fixed manner, thus allowing for upward relative displacement relative to the main rubber elastomer 16. Therefore, by not applying an axial tensile load to the main rubber elastomer 16, the durability of the main rubber elastomer 16 can be improved.

[0083] In this embodiment, the main rubber elastomer 16 is pre-compressed axially by the cup-shaped member 44 fixed to the shaft member 18. Therefore, when a tensile load is applied, the bottom wall 46 of the cup-shaped member 44 is unlikely to detach from the upper surface of the main rubber elastomer 16. Thus, even if a compressive load is applied after the tensile load, the bottom wall 46 of the cup-shaped member 44 will not impact the upper surface of the main rubber elastomer 16 from the separated state, preventing the generation of impact noise.

[0084] When a load in the direction in which the control room 62 and the frame 64 approach each other is input into the control room support 10, the cup-shaped member 44 of the inner member 12 and the outer cylinder member 14 of the control room support 10 move closer to each other in the axial direction. As a result, the main rubber elastomer 16 is compressed in the axial direction, and vibration damping effect such as vibration attenuation based on the internal friction of the main rubber elastomer 16 is achieved.

[0085] When the input load in the compression direction is large, the compression deformation of the main rubber elastomer 16 is limited by the stop mechanism. The control room bracket 10 has a first stop mechanism and a second stop mechanism, which play a phased stopping role.

[0086] The first stop mechanism is formed by the abutment between the outer peripheral surface of the upper part 30 of the main rubber elastomer 16 and the deformation limiting part 56 of the peripheral wall 48 of the cup-shaped member 44. That is, if the main rubber elastomer 16 is compressed in the axial direction, it produces a bulging deformation in the axially perpendicular direction based on Poisson's ratio, but since the inner peripheral surface is constrained by the shaft member 18, the outer peripheral surface of the upper part 30, which is set as a free surface, deforms in a way that bulges outwards through the gap 58. Figure 4 As shown, the outer peripheral surface of the upper portion 30 of the main rubber elastomer 16, which bulges outward through the filling gap 58, abuts against the deformation limiting portion 56 of the cup-shaped member 44 and is constrained, thereby limiting the amount of bulging deformation to the outer peripheral side. As a result, the axial compressive elasticity of the main rubber elastomer 16 hardens, exerting a stopping effect that limits the amount of axial compressive deformation of the main rubber elastomer 16. Furthermore, as the amount of bulging deformation to the outer peripheral side increases, the contact area between the upper portion 30 of the main rubber elastomer 16 and the deformation limiting portion 56 increases, and the axial compressive elasticity of the main rubber elastomer 16 hardens, thus exerting a stronger stopping effect of the first stopping mechanism that limits the axial compressive deformation of the main rubber elastomer 16.

[0087] The peripheral wall 48 of the cup-shaped member 44 is shaped to open towards the opening side, and the deformation limiting portion 56 constituting the opening portion of the peripheral wall 48 is arranged with a gap 58 between it and the main body rubber elastomer 16. Therefore, in the initial stage of deformation when the amount of compressive deformation of the main body rubber elastomer 16 is small, the outer peripheral surface of the upper part 30 of the main body rubber elastomer 16 becomes a free surface that separates from the peripheral wall 48 of the cup-shaped member 44 towards the inner periphery on the lower side of the upper end protrusion 42, thus exerting a vibration damping effect based on the low elasticity characteristics of the main body rubber elastomer 16. On the other hand, when the amount of compressive deformation of the main body rubber elastomer 16 increases, the outer peripheral surface of the upper part 30 of the main body rubber elastomer 16 also abuts against the peripheral wall 48 of the cup-shaped member 44 on the lower side of the upper end protrusion 42 and is constrained, thus exerting a stopping effect. In this way, by adjusting the elasticity characteristics of the main body rubber elastomer 16 according to the magnitude of the input compressive load, the desired vibration damping performance and durability performance can be achieved simultaneously.

[0088] The second stop mechanism is formed by the contact between the mounting plate portion 22 of the outer cylinder member 14 and the stop portion 60 of the cup-shaped member 44. That is, when the main body rubber elastomer 16 is compressed and deformed axially, the cup-shaped member 44 approaches the outer cylinder member 14 axially. Therefore, if the amount of compression deformation of the main body rubber elastomer 16 increases, the mounting plate portion 22 of the outer cylinder member 14 and the stop portion 60 of the cup-shaped member 44 abut against each other via the buffer rubber 34. Thus, the approach displacement between the outer cylinder member 14 and the cup-shaped member 44 is restricted, thereby providing a stop function that limits the amount of axial compression deformation of the main body rubber elastomer 16.

[0089] In this embodiment, compared to the stopping effect of the second stopping mechanism, the stopping effect of the first stopping mechanism is exerted during the stage when the compression deformation of the main rubber elastomer 16 is small. Thus, by exerting the stopping effects based on the first stopping mechanism and the second stopping mechanism in stages, it is possible to prevent impact sensations caused by abrupt changes in elasticity characteristics, thereby achieving good riding comfort, and effectively limiting the compression deformation of the main rubber elastomer 16, ensuring the durability of the main rubber elastomer 16.

[0090] Since the cup-shaped member 44 is installed on the main rubber elastomer 16 in a non-fixed manner, when an axial compression load is applied, the bottom wall 46 of the cup-shaped member 44 may press against the upper surface of the main rubber elastomer 16, potentially causing abnormal noise due to the tight contact between the bottom wall 46 and the upper surface of the main rubber elastomer 16. Therefore, in this embodiment, an annular groove 38 and an outer peripheral groove 40 are formed with openings on the upper surface of the main rubber elastomer 16, dividing the upper surface of the main rubber elastomer 16 into four parts to prevent the bottom wall 46 from continuously contacting the upper surface of the main rubber elastomer 16 over a wide range. This prevents abnormal noise when the bottom wall 46 of the cup-shaped member 44 is in tight contact with the upper surface of the main rubber elastomer 16.

[0091] In addition, in a structure where the cup-shaped member 44 and the main rubber elastomer 16 are not fixedly installed, abnormal noise may also occur when the bottom wall 46 of the cup-shaped member 44 and the upper surface of the main rubber elastomer 16 separate from the tightly attached state. However, by forming a groove 36 with an opening on the upper surface of the main rubber elastomer 16 through an opening on the outer peripheral surface of the main rubber elastomer 16, abnormal noise during separation can also be prevented.

[0092] The embodiments of the present invention have been described in detail above, but the present invention is not limited to its specific description. For example, in the above embodiments, the peripheral wall 48 of the cup-shaped member 44 has a diameter larger than the portion of the step 52 near the opening than the portion near the bottom wall 46, and is a tapered cylindrical shape that expands towards the opening. However, as long as the peripheral wall of the cup-shaped member is an expanding shape with a larger diameter at the opening, it is not necessary to have both the step 52 and the tapered shape. In short, the peripheral wall of the cup-shaped member can, for example, have a step and the deformation limiting portion can extend axially with a substantially constant diameter, or it can be a structure in which the deformation limiting portion is a tapered cylindrical shape that expands towards the opening without a step. Considering the required nonlinear characteristics, for example, steps 52 with a larger inclination angle than other portions of the peripheral wall can be provided at multiple locations along the axial direction of the peripheral wall.

[0093] The internal components may not have the shaft member 18, or may consist only of the cup-shaped member 44. In this case, the mounting bolts, etc., inserted into the inner circumference of the main rubber elastomer 16 may also have at least a part of the function of the shaft member 18, such as limiting the bulging deformation towards the inner circumference of the main rubber elastomer 16.

[0094] There are no particular limitations on the connection structure between the shaft member 18 and the cup-shaped member 44. For example, the shaft member 18 can be pressed into the central hole of the bottom wall 46 of the cup-shaped member 44, or the inner peripheral edge of the bottom wall 46 can be riveted to the axial end of the shaft member 18.

[0095] The upper portion of the main rubber elastomer 16 can be pressed into the approach portion 54 of the cup-shaped member 44, or it can be in contact without being pressed in. Alternatively, it can separate towards the inner periphery of the approach portion 54. In this case, a gap is provided not only between the upper portion 30 of the main rubber elastomer 16 and the deformation-limiting portion 56 of the peripheral wall 48 of the cup-shaped member 44, but also between the upper portion 30 and the approach portion 54. In this case, the radial dimension of the inner periphery of the approach portion 54 is smaller than the radial dimension of the inner periphery of the deformation-limiting portion 56. Furthermore, for example, when the vehicle is installed, a support load such as that of the cab 62 can be input to the cylindrical bracket 10, causing the upper portion 30 of the main rubber elastomer 16 to elastically deform, thereby bringing the upper portion 30 of the main rubber elastomer 16 into contact with the approach portion 54. Thus, even when the peripheral wall 48 is separated from the main rubber elastomer 16 to the outer periphery, since the separation distance between the peripheral wall 48 and the main rubber elastomer 16 is different on the bottom wall 46 side and the opening side, it is possible to simultaneously achieve a soft elasticity characteristic relative to a small input load and a hard elasticity characteristic relative to a large input load.

[0096] For example, in one embodiment, the gap 58 is formed continuously with a substantially constant size over the entire circumference. However, the size of the gap 58 may vary in the circumferential direction, taking into account the required vibration damping characteristics, load characteristics, etc. For example, if different load-elasticity characteristics are required in the two axially perpendicular directions of the vehicle's front-rear direction and left-right direction, the radial size of the gap 58 may vary in the axially perpendicular direction by making the outer circumferential shape of the upper part 30 elliptical or the peripheral wall 48 elliptical. For example, the gap 58 and step 52 may be substantially absent in the axially perpendicular direction.

[0097] The groove 36 in the above embodiment is composed of an annular groove 38 extending in the circumferential direction and an outer peripheral groove 40 extending radially. However, the groove only needs to be open on the outer peripheral surface of the main rubber elastomer 16. For example, it can also be composed of only a groove extending in the axial vertical direction.

[0098] The cylindrical bracket involved in this invention can be applied not only to the cab bracket, but also to the power unit bracket for connecting the power unit, including the engine, motor, etc., to the vehicle body.

Claims

1. A cylindrical support (10), comprising a cylindrical main body rubber elastomer (16) connecting an internal component (12) and an outer cylindrical component (14), wherein, The internal component (12) has a cup-shaped component (44) that opens toward the main rubber elastomer (16). One axial end of the main rubber elastomer (16) is inserted into the cup-shaped member (44), and the bottom wall (46) of the cup-shaped member (44) overlaps with the axial end face of the main rubber elastomer (16) in a non-adhesive manner. The peripheral wall (48) of the cup-shaped member (44) expands toward the opening side, and the peripheral wall (48) at least at the opening portion becomes a deformation limiting part (56) that is inserted externally with a gap (58) relative to the main body rubber elastomer (16) in a state of separation from the outer periphery. The peripheral wall (48) of the cup-shaped member (44) becomes a stepped cylindrical shape with a step (52) in the middle. The portion of the peripheral wall (48) closer to the opening than the step (52) becomes the deformation limiting part (56). The portion of the peripheral wall (48) that is closer to the bottom than the step (52) becomes an approach portion (54) whose inner diameter is approximately the same as the outer diameter of the end of the main body rubber elastomer (16) and is closer to the outer peripheral surface of the main body rubber elastomer (16) than the deformation limiting portion (56).

2. The cylindrical support (10) according to claim 1, wherein The deformation limiting part (56) of the cup-shaped member (44) becomes a tapered shape with a large diameter from the bottom side toward the opening side.

3. The cylindrical support (10) according to claim 1, wherein A flange-shaped stop (60) protruding outward is provided at the open end of the cup-shaped member (44), and the stop (60) is axially opposed to the mounting plate (22) provided on the outer cylinder member (14).

4. The cylindrical stent (10) of claim 1, wherein, A groove (36) is formed in the main body rubber elastomer (16), the groove (36) opening at one end face of the axial direction that overlaps with the bottom wall (46) of the cup-shaped member (44), and the end of the groove (36) opening on the outer peripheral surface of the main body rubber elastomer (16).

5. The cylindrical support (10) according to claim 4, wherein, The bottom end of the peripheral wall (48) becomes an assembly part that overlaps with the outer peripheral surface of the main rubber elastomer (16). The groove depth at the end of the groove (36) that opens on the outer peripheral surface of the main rubber elastomer (16) is greater than the axial height of the assembly.

6. The cylindrical stent (10) of claim 1, wherein, A shaft member (18) is fixedly installed on the inner circumferential surface of the main rubber elastomer (16), and the internal member (12) is formed by fixing the cup-shaped member (44) to the shaft member (18).

7. The cylindrical support (10) according to claim 6, wherein By fixing the cup-shaped member (44) to the shaft member (18), the main rubber elastomer (16) is pre-compressed between the cup-shaped member (44) and the outer cylinder member (14).

8. The cylindrical support (10) according to claim 6, wherein, In the main body rubber elastic body (16), a recess (36) is formed which is open at an end surface on the axial one side overlapping the bottom wall (46) of the cup-shaped member (44), The recess (36) is configured to include a ring-shaped groove portion (38) extending in a ring shape around the shaft member (18), and an outer peripheral groove portion (40) extending from the ring-shaped groove portion (38) toward the outer periphery and open at an outer peripheral surface of the main body rubber elastic body (16).

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