Vibration control device

Abstract

To provide a vibration control device having an improved vibration control function.SOLUTION: A vibration control device 10 includes a fixed member 20 to be fixed to one of a first member and a second member, and a vibration control member for developing a vibration control function, the fixed member having a pedestal part on which the vibration control member is placed, and a wall part erected from the pedestal part, the vibration control member having a viscoelastic body to be deformed in a vibration direction by receiving a load from the other of the first member and the second member during vibration, to damp the vibration, and a sliding member having a sliding surface for sliding on the wall part. The sliding member is moved in the vibration direction while being pushed against the wall part by the deformation of the viscoelastic body in the vibration direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration damping device that damps vibrations. [Background technology]

[0002] For example, automobiles such as hatchbacks, wagons, and vans are equipped with back doors for opening and closing the rear luggage compartment. The edge of the back door abuts against the periphery of the luggage compartment opening via a rubber stopper or the like, thereby closing the luggage compartment opening. However, vibrations during driving or idling can cause the back door to resonate with the vehicle body, resulting in unpleasant noise.

[0003] Patent document 1 discloses a vibration damping device that includes a fixed part having a base part with an insertion hole and a wall part erected on the base part, a piston that is inserted into the insertion hole and is arranged to be able to move back and forth, and a sliding ring that surrounds the piston and slides on the wall part in response to the piston's movement back and forth. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021-075311 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the sliding ring slides against the wall portion to exert a vibration damping function, but it is desired to further improve the vibration damping effect.

[0006] An object of the present invention is to provide a vibration damping device with improved vibration damping function. [Means for solving the problem]

[0007] To solve the above-mentioned problems, one aspect of the present invention provides a vibration damping device interposed between a first member and a second member to suppress vibration of the second member relative to the first member, the device comprising: a fixing member fixed to one of the first member and the second member; and a vibration damping member that exhibits a vibration damping function. The fixing member has a base portion on which the vibration damping member is placed and a wall portion extending from the base portion. The vibration damping member has a viscoelastic body that receives a load from the other of the first member and the second member during vibration and deforms in the vibration direction to attenuate the vibration, and a sliding member having a sliding surface that slides against the wall portion. The sliding member moves in the vibration direction while being pressed against the wall portion by the deformation of the viscoelastic body in the vibration direction. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a vibration damping device with improved vibration damping function. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a vibration damping device according to a first embodiment. [Figure 2] FIG. 2 is an exploded view of the vibration damping device of the first embodiment. [Figure 3] 1 is a cross-sectional view of a vibration damping device according to a first embodiment. [Figure 4] FIG. 2 is a perspective view of a sliding member according to the first embodiment. [Figure 5] FIG. 10 is an exploded view of the vibration damping device of the second embodiment. [Figure 6] FIG. 4 is a cross-sectional view of a vibration damping device according to a second embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a vibration damping device according to a third embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a vibration damping device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] FIG. 1 is a perspective view of a vibration damping device 10 of a first embodiment. FIG. 1(a) shows the vibration damping device 10 as seen from diagonally above, and FIG. 1(b) shows the vibration damping device 10 as seen from diagonally below. The vibration damping device 10 is fixed to an opening / closing body such as a vehicle door or back door, and abuts against a panel on the vehicle body side when the opening / closing body is closed. The vibration damping device 10 absorbs the impact when the opening / closing body is closed, suppresses vibration of the opening / closing body when it is closed, and prevents unpleasant noise from being generated by resonance of the opening / closing body.

[0011] The vibration damping device 10 may be fixed to a fixed body such as a panel on the vehicle body side and abut against the opening / closing body. In other words, the vibration damping device 10 is fixed to one of the opening / closing body and the fixed body, and can abut against the other of the opening / closing body and the fixed body. The vibration damping device 10 is not limited to being fixed to the opening / closing body, and may be provided on a fixed body. In either case, the vibration damping device 10 is interposed between the first member and the second member to suppress vibration of the second member relative to the first member. One of the first member and the second member is the opening / closing body, and the other is the fixed body.

[0012] The vibration damping device 10 includes a fixing member 20 that is fixed to one of the first member and the second member, and a cover 22 that can come into contact with the other of the first member and the second member. The fixing member 20 is fixed, for example, by being inserted into a mounting hole provided in a vehicle door.

[0013] Fig. 2 is an exploded view of the vibration damping device 10. Fig. 3 is a cross-sectional view of the vibration damping device 10. The vibration damping device 10 comprises a fixing member 20, a cover 22, and a vibration damping member 23. The vibration damping member 23 has a viscoelastic body 24 and a sliding member 26, and exhibits a vibration damping function.

[0014] The cover 22 is made of a rubber material and has a cup shape, and covers the vibration damping member 23. The cover 22 is attached to the fixing member 20.

[0015] The viscoelastic body 24 of the vibration-damping member 23 is preferably formed in a cylindrical shape and is made of, for example, ethylene propylene diene rubber and 4-methyl-1-pentene-α-olefin copolymer. Of course, the viscoelastic body 24 may be made of another viscoelastic material. Furthermore, the viscoelastic body 24 is not limited to a cylindrical shape and may be formed in a columnar shape.

[0016] A pressing surface 35 and an annular recess 36 are formed on the outer peripheral surface of the viscoelastic body 24. The annular recess 36 is formed as a cylindrical surface recessed approximately at the center of the outer peripheral surface of the viscoelastic body 24, and is fitted with the sliding member 26. The pressing surfaces 35 are formed at inclined upper and lower axial ends of the annular recess 36. The viscoelastic body 24 has a communicating hole 37 penetrating in the axial direction. The axial direction is parallel to the central axes of the viscoelastic body 24 and the sliding member 26, and the radial direction is perpendicular to the axial direction.

[0017] The sliding member 26 is formed of a material harder than the viscoelastic body 24, and may have the same hardness as the fixed member 20. The sliding member 26 will be described with reference to FIG.

[0018] 4 is a perspective view of the sliding member 26. The sliding member 26 has a sliding surface 30, a slit 32, a tapered surface 33, and a recess 34. The sliding member 26 is a C-shaped ring that surrounds the viscoelastic body 24. The slit 32 allows the sliding member 26 to expand, making it easy to attach to the viscoelastic body 24.

[0019] The sliding surfaces 30 are formed in a pair around the outer periphery of the sliding member 26 in the circumferential direction, spaced apart from each other in the axial direction. In other words, a recess is formed between the pair of sliding surfaces 30. The pair of sliding surfaces 30 stabilize the state of contact with the wall portion 44.

[0020] The tapered surface 33 is inclined in the axial and radial directions and engages with the pressing surface 35 of the viscoelastic body 24. The tapered surface 33 can receive forces from the viscoelastic body 24 in the axial and radial directions.

[0021] The recess 34 is formed by cutting out the sliding surface 30 at a position opposite to the slit 32 . This makes it easier for the recess 34 to bend at its position, making it easier for the sliding member 26 to expand, and thus making it easier to attach the sliding member 26 to the viscoelastic body 24 .

[0022] Returning to Figures 2 and 3, the fixing member 20 has a mounting portion 38, a base portion 42, a wall portion 44, a flange portion 46, and a through-hole 48. The mounting portion 38 is located at the bottom of the fixing member 20 and is cylindrical with an elliptical cross section. The mounting portion 38 has a pair of elastic claws 40 on its side. The elastic claws 40 are flexible and, for example, engage with the edges of a mounting hole provided in the vehicle door. Note that the method of fixing to the door is not limited to the shape of the elastic claws 40, and other shapes may be used as long as they can be fixed to the panel. For example, the underside of the base portion 42 may be glued or welded to the panel.

[0023] The base portion 42 is formed in a disk shape, and the vibration damping member 23 is placed on the base portion 42. The wall portion 44 is formed in a cylindrical shape and stands upright from the base portion 42. Note that the wall portion 44 is not limited to a cylindrical shape, and may have a shape in which multiple walls are arranged in an annular shape and spaced apart from each other in the circumferential direction.

[0024] The flange portion 46 is formed on the outer peripheral edge of the base portion 42 and protrudes radially outward beyond the mounting portion 38 and the wall portion 44. The flange portion 46 can fasten the cover 22. A through-hole 48 is formed through the center of the base portion 42.

[0025] 3, the cover 22 has a retaining portion 50 and an engaging portion 52. The engaging portion 52 is formed in an annular shape and engages with the flange portion 46 of the fixing member 20 to connect the cover 22 to the fixing member 20.

[0026] The retaining portion 50 is formed in a columnar shape at the center of the inside of the cover 22, with a bulging tip. The retaining portion 50 catches in the through-hole 48 of the fixing member 20 and functions to prevent the fixing member 20 from coming off. Note that the cover 22 does not have to have the retaining portion 50, and may be attached to the fixing member 20 by only the engaging portion 52.

[0027] The sliding member 26 surrounds the annular recess 36 of the viscoelastic body 24 so as to fit within the recess 36, with the sliding surface 30 projecting radially outward. The vibration-damping member 23, consisting of the viscoelastic body 24 and the sliding member 26, is inserted inside the wall portion 44, with the pair of sliding surfaces 30 abutting against the inner circumferential surface of the wall portion 44. The vibration-damping member 23 is mounted on the base portion 42. The pair of sliding surfaces 30 are spaced apart in the axial direction, stabilizing the abutment of the sliding surfaces 30 when the sliding member 26 slides against the wall portion 44. Furthermore, because the sliding surfaces 30 are formed circumferentially, they abut against the wall portion 44 circumferentially, maintaining abutment even when axial wobble occurs. A portion of the upper sliding surface 30 shown in FIG. 3 protrudes upward from the wall portion 44. When the vehicle door is closed, the viscoelastic body 24 contracts, and the entire sliding surface 30 enters the interior of the wall portion 44.

[0028] 3, the communication holes 37 of the viscoelastic body 24 communicate with the through holes 48 of the fixing member 20. This allows air in the communication holes 37 to pass through the through holes 48 when the viscoelastic body 24 expands or contracts. In other words, the communication holes 37 and the through holes 48 function as air vents. The communication holes 37 function as an internal escape space when the viscoelastic body 24 bends, making the viscoelastic body 24 more likely to bend.

[0029] The operation of the vibration damping device 10 will now be described. When the fixing member 20 is fixed to the vehicle door and the vehicle door is closed, the viscoelastic body 24 receives an axial force from the vehicle body via the cover 22 and contracts. The viscoelastic body 24 expands and contracts in the axial direction due to vibrations of the vehicle door and the vehicle body when the vehicle is traveling. That is, the viscoelastic body 24 receives a load from the other of the first and second members during vibration and deforms in the vibration direction. The viscoelastic body 24 can attenuate vibration by expanding and contracting in the axial direction due to vibration. Note that the vibration direction is parallel to the axial direction as the retaining portion 50 is guided by the through-hole 48, and the direction perpendicular to the vibration direction is parallel to the radial direction.

[0030] The viscoelastic body 24 deforms in the axial direction, thereby displacing the sliding member 26 in the axial direction. Furthermore, when the viscoelastic body 24 contracts, it expands, and the pressing surface 35 of the sliding member 26 presses the tapered surface 33 of the sliding member 26 in a direction intersecting the axial and radial directions (the direction of the arrow in the figure). As a result, the sliding member 26 moves in the axial direction while being pressed against the wall portion 44 by the axial deformation of the viscoelastic body 24. Therefore, the sliding surface 30 slides against the wall portion 44, and vibrations can be damped by friction. Pressing the sliding member 26 against the wall portion 44 by the deformation of the viscoelastic body 24 increases the frictional force, thereby improving the vibration damping effect. Furthermore, even if the sliding member 26 wears over time, the pressing force of the viscoelastic body 24 stabilizes the sliding.

[0031] 3, the sliding surface 30 and the tapered surface 33 are provided at overlapping positions when viewed in the radial direction. This makes it easier for the tapered surface 33 to transmit the load received from the viscoelastic body 24 to the sliding surface 30.

[0032] Fig. 5 is an exploded view of the vibration damping device of the second embodiment. Fig. 6 is a cross-sectional view of the vibration damping device 100 of the second embodiment. The vibration damping device 100 of the second embodiment differs from the vibration damping device 10 shown in Fig. 3 mainly in that the sliding member 126 is pressed against the wall portion 44 by a spring member 60. The fixing member 20 is the same as that of the vibration damping device 10 of the first embodiment.

[0033] The vibration damping device 100 includes a fixing member 20, a cover 22, a viscoelastic body 124, a sliding member 126, a spring member 60, and a housing member 62. The viscoelastic body 124, the sliding member 126, the spring member 60, and the housing member 62 function as a vibration damping member 123. The spring member 60 is a coil spring, and is housed in a cylindrical housing member 62. The housing member 62 has a pair of notches 62a at each end.

[0034] The viscoelastic body 124 has a housing hole 136, a pressing surface 135, and a retaining portion 150. The housing hole 136 penetrates laterally, and the spring member 60 and the housing member 62 can be inserted therein. The pressing surface 135 is formed at an incline on the opening edge of the housing hole 136, and a pair of pressing surfaces 135 are formed spaced apart in the axial direction. The retaining portion 150 bulges out from the lower end of the viscoelastic body 124, and is caught in the through-hole 48 of the fixing member 20.

[0035] The sliding members 126 are provided on both ends of the spring member 60. The sliding members 126 have a sliding surface 130, a spring support portion 132, and a tapered surface 133. The sliding surface 130 is formed in a spherical shape. The spring support portion 132 is formed in a protruding shape on the back side of the sliding surface 130. The spring support portion 132 fits into the end of the spring member 60. The tapered surfaces 133 are formed as a pair separated in the axial direction and are inclined with respect to the axial and radial directions.

[0036] 6, the pressing surface 135 of the viscoelastic body 124 abuts against the tapered surface 133 of the sliding member 126. When the viscoelastic body 124 expands and contracts in the axial direction and deforms, the pair of sliding members 126 are pushed in opposite directions against the wall portion 44, and move in the axial direction. This causes the sliding surface 130 to slide against the wall portion 44. Furthermore, because the sliding member 126 is pressed against the wall portion 44 by the spring member 60, the sliding against the wall portion 44 becomes stable over time.

[0037] Fig. 7 is a cross-sectional view of a vibration damping device 200 of the third embodiment. The vibration damping device 200 of the third embodiment differs from the vibration damping device 100 of the second embodiment shown in Fig. 6 mainly in that a pair of viscoelastic bodies are provided spaced apart in the axial direction.

[0038] The vibration damping device 200 includes a fixing member 20, a cover 22, a first viscoelastic body 224a, a second viscoelastic body 224b, a sliding member 226, and a spring member 60. The first viscoelastic body 224a, the second viscoelastic body 224b, the sliding member 226, and the spring member 60 function as a vibration damping member 223.

[0039] The first viscoelastic body 224a is formed in a cylindrical shape with a bottom. The first viscoelastic body 224a has a pressing surface 235a and a retaining portion 250. The pressing surface 235a is located on the outer edge of the upper end of the first viscoelastic body 224a and is inclined with respect to the axial and radial directions. The retaining portion 250 is formed on the lower end of the first viscoelastic body 224a and catches on the edge of the through-hole 48, connecting the first viscoelastic body 224a to the fixing member 20.

[0040] The second viscoelastic body 224b is formed in a cylindrical shape. The second viscoelastic body 224b has a pressing surface 235b that is inclined with respect to the axial and radial directions. The pressing surface 235b is located on the outer edge of the lower end of the second viscoelastic body 224b.

[0041] The sliding member 226 is formed in a semi-columnar shape, and the pair of sliding members 226 is configured so that the half-columns are combined to form a cylindrical shape. The pair of sliding members 226 are arranged to receive both ends of the spring member 60 and are biased radially by the spring member 60. The sliding member 226 has a sliding surface 230, an accommodating hole 232, and a tapered surface 233. The accommodating hole 232 is formed in a cylindrical shape and receives one end of the spring member 60. The sliding surface 230 is located on the outer circumferential surface of the sliding member 226 and is pressed against the wall portion 44 by the spring member 60. A pair of tapered surfaces 233 are formed above and below the sliding member 226, are formed circumferentially, and are inclined with respect to the axial and radial directions.

[0042] During vibration, first viscoelastic body 224a and second viscoelastic body 224b receive a load from the other of the first member and the second member and are deformed in the axial direction, so that pressing surfaces 235a and 235b press tapered surface 233, and sliding surface 230 slides on wall portion 44 while being pressed against wall portion 44.

[0043] Figure 8 is a cross-sectional view of a vibration damping device 300 of the fourth embodiment. The vibration damping device 300 of the fourth embodiment differs from the vibration damping device 200 of the third embodiment shown in Figure 7 mainly in the position of the tapered surface 333. The vibration damping device 300 includes a fixing member 20, a cover 22, a first viscoelastic body 324a, a second viscoelastic body 324b, a sliding member 326, and a spring member 60. The first viscoelastic body 324a, the second viscoelastic body 324b, the sliding member 326, and the spring member 60 function as a vibration damping member 323.

[0044] The first viscoelastic body 324a is formed in a cylindrical shape with a bottom. The first viscoelastic body 324a has a pressing surface 335a and a retaining portion 350. The pressing surfaces 335a are formed as a pair so as to protrude upward from the center of the first viscoelastic body 324a and are inclined relative to the axial and radial directions. The retaining portion 350 is formed at the lower end of the first viscoelastic body 324a and catches on the edge of the through-hole 48, connecting the first viscoelastic body 324a to the fixing member 20.

[0045] The second viscoelastic body 324b is formed in a cylindrical shape. The second viscoelastic body 324b has pressing surfaces 335b that are inclined with respect to the axial and radial directions. The pressing surfaces 335b are formed as a pair and protrude downward from the center of the second viscoelastic body 324b.

[0046] The sliding member 326 is formed in a semi-columnar shape, and the pair of sliding members 326 is configured so that the half-columns are combined to form a cylindrical shape. The pair of sliding members 326 are arranged to accommodate both ends of the spring member 60, and are biased radially by the spring member 60. The sliding member 326 has a sliding surface 330, an accommodating hole 332, and a tapered surface 333. The sliding surface 330 is located on the outer circumferential surface of the sliding member 326, and is pressed against the wall portion 44 by the spring member 60. The accommodating hole 332 is formed in a cylindrical shape and accommodates one end of the spring member 60. The tapered surface 333 is inclined in the axial and radial directions.

[0047] The tapered surfaces 333 are formed linearly on the inner edges of the opposing sliding members 326. A pair of tapered surfaces 333 are formed on the top and bottom of the sliding members 326, and are inclined relative to the axial and radial directions.

[0048] A pair of sliding members 326 are provided to sandwich the first viscoelastic body 324a and the second viscoelastic body 324b in the radial direction, and are pressed against the wall portion 44 by axial deformation of the first viscoelastic body 324a and the second viscoelastic body 324b. That is, the pair of sliding members 326 is placed on the first viscoelastic body 324a, and the second viscoelastic body 324b is placed on the pair of sliding members 326.

[0049] The pair of pressing surfaces 335a and the pair of pressing surfaces 335b enter between the pair of sliding members 326 and engage with the tapered surfaces 333. As a result, the sliding member 326 moves in the axial direction while being pressed against the wall portion 44 due to the axial deformation of the first viscoelastic body 324a and the second viscoelastic body 324b, and the sliding surface 330 slides against the wall portion 44. Since the pressing surfaces 335a and 335b act to push the pair of sliding members 326 into each other during vibration, the pair of sliding members 326 are pressed in directions separating them (radial directions), and the sliding members 326 are pressed strongly against the wall portion 44.

[0050] The present invention is not limited to the above-described embodiments, and various modifications such as design changes may be made to the embodiments based on the knowledge of those skilled in the art, and such modified embodiments may also be included within the scope of the present invention. [Explanation of symbols]

[0051] 10 vibration damping device, 20 fixing member, 22 cover, 23 vibration damping member, 24 viscoelastic body, 26 sliding member, 30 sliding surface, 32 slit, 33 tapered surface, 34 recess, 35 pressing surface, 36 annular recessed portion, 37 communicating hole, 38 mounting portion, 40 elastic claw portion, 42 base portion, 44 wall portion, 46 flange portion, 48 through hole, 50 retaining portion, 52 engaging portion.

Claims

1. A vibration damping device interposed between a first member and a second member to suppress vibration of the second member relative to the first member, a fixing member fixed to one of the first member and the second member; a vibration-damping member that exhibits a vibration-damping function, The fixing member is a base portion on which the vibration damping member is placed; a wall portion erected from the base portion, The vibration damping member is a viscoelastic body that receives a load from the other of the first member and the second member during vibration and deforms in the vibration direction to damp the vibration; a sliding member having a sliding surface that slides on the wall portion, The vibration damping device is characterized in that the sliding member moves in the vibration direction while being pressed against the wall portion by deformation of the viscoelastic body in the vibration direction.

2. 2. The vibration damping device according to claim 1, wherein the sliding member has a tapered surface that engages with the viscoelastic body at an angle relative to the vibration direction and a direction perpendicular to the vibration direction.

3. 3. The vibration damping device according to claim 2, wherein the sliding surface and the tapered surface are provided at overlapping positions when viewed in a direction perpendicular to the vibration direction.

4. The wall portion is formed in a cylindrical shape, the viscoelastic body is formed in a columnar or cylindrical shape and inserted into the wall portion, 4. The vibration damping device according to claim 1, wherein the sliding member is a C-shaped ring having a slit and surrounds the viscoelastic body.

5. 5. The vibration damping device according to claim 4, wherein the sliding member has a recess formed so as to cut out the sliding surface at a position opposite to the slit.

6. The base portion has a through hole in the center, 6. The vibration damping device according to claim 1, wherein the viscoelastic body has a communication hole communicating with the through hole.

7. 7. The vibration damping device according to claim 1, wherein the sliding surfaces are formed as a pair spaced apart in the vibration direction.

8. 3. The vibration damping device according to claim 1, wherein the sliding members are provided as a pair to sandwich the viscoelastic body in a direction perpendicular to the vibration direction, and are pressed against the wall portion by deformation of the viscoelastic body in the vibration direction.

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