JP2007278398A - Vibration control implement for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control implement without exposing an elastic body between a shaft and an outer ring to eliminate or reduce inconvenience of snow, water, stone, dust, salt, or the like reaching a rubber layer even under severe use conditions of a cold district, a coast area, or the like, thereby preventing the degradation of quality and performance to attain an excellent product life. <P>SOLUTION: The vibration control implement for a rolling stock truck is formed by integrally sticking the annular elastic body 15 between the shaft 13 and the outer ring 14. The elastic body 15 of laminated rubber structure is formed by alternately providing intermediate rings 16, 17 and rubber layers 18-20, and a protective cover 21 for covering the elastic body 15 not to be exposed to the outside is equipped in a sealing state fittingly supported on each of the shaft 13 and outer ring 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator for a vehicle that is often used mainly as a shaft spring in a railcar bogie.

  A so-called “conical shaft spring” is often used for a bolsterless bogie in the railway vehicle field. This type of vibration isolator (conical shaft spring) adds an annular elastic body in which one or more intermediate rings and two or more rubber layers are alternately arranged between a vertical shaft and an outer ring. This is a vibration isolator (see FIG. 2) integrally formed by sulfur bonding, and has a known structure disclosed in Patent Document 1 and the like. Such a vibration isolator is used, for example, as a component part of an air spring that supports a vehicle in a railway vehicle carriage, or as a part for supporting an axle of a railway vehicle carriage on a carriage frame.

  As an example of the latter use, as disclosed in Patent Document 2 (see in particular FIG. 2), in a bogie disposed below one end of a railway vehicle, an axle having wheels (not indicated) is used as a bogie frame. (Numeral 6) includes those provided before and after the axle so as to support vibration isolation. In the case of this Patent Document 2, the front and rear arms (not marked) of an axle box (not marked) for rotatably supporting the axle and the cart frame (reference numeral 6) positioned thereon are vertically oriented. Among the various mechanical devices deployed under the floor of the vehicle, it is disposed at a position relatively close to the rail (ground).

Therefore, when a railway vehicle is used in a cold region, the vibration isolator is likely to be exposed to steam for melting snow or a snow melting agent, and the bonded portion between the shaft, the outer ring, or the intermediate ring and the rubber layer is attached. There is a difficulty in that it becomes an obstructive factor and the surface of the rubber layer is easily damaged. When rail vehicles are used along the coast, salt damage is likely to occur in the vibration isolator. Furthermore, since the equipment position is close to the ground, it is easy to be damaged by a stepping stone or the like, and there is a possibility that the rubber may be adversely affected by ozone or sunlight.
Japanese Utility Model Publication No. 6-8837 JP 2006-1501 A

  Therefore, in order to ensure the expected life (durability) of the product as much as possible without deteriorating the quality and performance, the anti-vibration device, particularly the shaft, from various external attacks caused by the above-mentioned snow melting agent and salt damage. There is a strong desire to be able to avoid adverse effects and damage to the elastic body interposed between the outer ring and the actual situation is that it is an urgent need to take some measures.

  The object of the present invention is to realize a vibration isolator having a structure in which the elastic body between the shaft and the outer ring is not exposed in view of the above circumstances, and even under severe use conditions such as in cold regions and coastal areas. The above-mentioned various disadvantages are eliminated or alleviated, and the quality and performance are prevented from being deteriorated to provide an improved product having a good product life.

The invention according to claim 1 is the vehicle vibration isolator in which the annular elastic body 15 is bonded and integrated between the shaft 13 and the outer ring 14.
A protective cover 21 that covers or prevents the elastic body 15 from being exposed to the outside is provided.

  According to a second aspect of the present invention, in the vehicle vibration isolator according to the first aspect, the elastic body 15 includes one or more intermediate wheels 16 and 17 and two or more rubber layers 18 to 20 alternately in the radial direction. The rubber layers 18 to 20 are integrated with the corresponding ones of the intermediate wheels 16, 17, the shaft 13, and the outer ring 14 by vulcanization adhesion. It is a feature.

  According to a third aspect of the present invention, in the vehicle vibration isolator according to the first or second aspect, the protective cover 21 is attached to the outer end portion 21G and the shaft 13 that are externally supported by the end portion of the outer ring 14. It is characterized by being formed of a cylindrical and flexible material having an inner end portion 21N that is externally supported.

  According to a fourth aspect of the present invention, in the vehicle vibration isolator according to the first or second aspect, the protective cover 21 is provided on the outer end portion 41 and the shaft 13 that are externally supported by the end portion of the outer ring 14. A predetermined interference avoidance outer gap at the inner end 42 surrounded by a predetermined interference avoidance inner gap sk, or the inner end 52 and the end of the outer ring 14 that are externally supported by the shaft 13. It has a cylindrical shape having an outer end 51 surrounded by dk.

  According to a fifth aspect of the present invention, in the vehicle vibration isolator according to any one of the first to fourth aspects, a portion between the outer end portion 21G and the inner end portion 21N of the protective cover 21 is provided. It is characterized by being formed in a bellows shape.

  According to a sixth aspect of the present invention, in the vehicle vibration isolator according to any one of the first to fifth aspects, the protective cover 21 has a substantially C-shape when viewed from the axis Y direction of the shaft 13. Thus, the opening 21K is opened, and the outer ring 14 and the shaft 13 are formed from a single molding material that can be fitted from the lateral side.

  According to a seventh aspect of the present invention, in the vehicle vibration isolator according to any one of the first to fifth aspects, the protective cover 21 can be attached to the outer ring 14 and the shaft 13 from a lateral side. As described above, the first and second cover portions 31 and 32 having a substantially semicircular arc shape when viewed in the direction of the axis Y of the shaft 13 are configured.

  The invention according to claim 8 is the vehicle vibration isolator according to any one of claims 1 to 7, wherein a drain hole 25 is formed in a lower end portion of the protective cover 21. Is.

  According to the first aspect of the present invention, since the elastic body in the vibration isolator is suppressed or avoided from being exposed to the outside by the protective cover, the snow melts even under severe use conditions such as in a cold region or a coastal region. Various inconveniences such as peeling or surface damage to the elastic body due to steam and snow melting agent, damage caused by stepping stones, adverse effects on rubber due to ozone and sunlight, or salt damage are eliminated or reduced. It is possible to provide an improved vibration isolator that prevents deterioration and has a good product life.

  In this case, as in claim 2, the elastic body can be of a laminated rubber structure in which one or more intermediate rings and two or more rubber layers are alternately provided in the radial direction. In addition, if a drain hole is formed at the lower end of the protective cover as in claim 8, moisture that has entered or is generated inside the protective cover during manufacture, transportation, or storage is transferred to the vibration isolator. There is an advantage that it is possible to discharge by gravity after assembling.

  According to the third aspect of the present invention, the elastic body can be hermetically covered and shielded from the outside by the protective cover that is externally supported by both the shaft and the outer ring. There is an advantage that the above-described effect according to the first and second aspects of the invention can be enhanced.

  According to the invention of claim 4, since the protective cover is configured to be fitted and supported only on one of the shaft and the outer ring and the other is surrounded by the interference avoidance gap, Although there remains a risk of receiving a slight external attack from the avoidance gap, it is possible to use a non-flexible material such as metal or hard synthetic resin while simplifying mounting on the shaft and outer ring. There is an advantage that simplification of the structure of the vibration isolator and cost reduction are promoted.

  According to invention of Claim 5, the part between the outer end part and inner end part in a protective cover becomes a structure equivalent to the material which has flexibility because it is formed in the shape of a bellows, and both ends are In the case of being externally supported, it is possible to use a material that does not have flexibility such as metal or hard plastic or poor flexibility, and only one of the ends is externally supported. In the case where the gap between the end of the unsupported side and the shaft or outer ring is reduced (the bellows-shaped part can easily be deformed even if abutted, and snow, steam, There is an advantage that the risk of entering foreign matter such as garbage can be further reduced.

  According to the sixth and seventh aspects of the present invention, the protective cover can be attached after the assembly as a vibration isolator is completed, i.e., can be retrofitted, for example, before or after the assembly as the carriage. It can be mounted freely, and it has the convenience that it can be mounted on the current railcar bogie, or it can be used for assembling procedures during manufacture as a vibration isolator. In this case, the protective cover according to claim 6 made of a single part has the advantage of being easy to assemble and being economical, and the protective cover of claim 7 made up of two parts is compact in size as a part. And has the advantage of being easily stocked and portable.

  Hereinafter, embodiments of a vibration isolator for a vehicle according to the present invention will be described with reference to the drawings when applied to a bogie for a railway vehicle. FIG. 1 is a side view showing a railway vehicle carriage, and FIGS. 4 is a perspective view showing a protective cover according to the third embodiment, FIG. 5 is a (a) plan view showing the protective cover according to the fourth embodiment, (b) a side view in an exploded state, and FIG. 8 is an unevenness between the protective cover and the outer ring. It is sectional drawing of the principal part which shows a fitting structure.

  FIG. 1 shows a lower portion at one end in the longitudinal direction of the railway vehicle. In FIG. 1, a bogie 2 that is rotatable about a vertical axis P is provided below a railway vehicle 1, and this bogie 2 includes a pair of front and rear axles 4, 4 having a pair of left and right wheels 3, 3. A shaft box 5 that rotatably supports the axle 4, a carriage frame 6, a pillow spring 7 including an air spring for supporting the carriage frame 6 on the vehicle 1 in a suspended state, and the like are configured. In addition, 8 is a coupler equipped with the vehicle 1 so that rocking is possible at the fulcrum Z, and 9 is a rail.

  A vibration isolator disposed between each of the first arm 5A and the second arm 5B extending in the front-rear direction of the axle box 5 between the carriage frame 6 and the axle box 5 supported so as to be movable up and down. A (shaft spring) 10 is interposed, whereby the carriage frame 6 is suspended from the shaft box 5 in a vibration-proof manner. The vibration isolator 10 is configured as a conical shaft spring, and is installed in a vertically oriented posture across the bearing tool 11 of each arm 5A, 5B and the outer ring receiver 12 of the carriage frame 6. Next, the structure and function of the vibration isolator 10 will be described.

[Example 1]
A vibration isolator 10 according to Example 1 is shown in FIG. The vibration isolator 10 is formed by affixing and integrating an annular elastic body 15 between a vertical axis (an example of a shaft) 13 and an outer ring 14, and the elastic body 15 includes two large and small intermediate rings 16 and 17. The three rubber layers 18 to 20 are alternately provided in the radial direction. The rubber layers 18 to 20 are vulcanized and bonded to corresponding ones of the large and small intermediate wheels 16 and 17, the vertical axis 13, and the outer ring 14, thereby having a shape in plan view having an axis Y. Is formed in the vibration isolator 10 as a single part.

  The vertical axis 13 includes an upper conical shaft portion 13 </ b> A, an upper and lower flange portion 13 </ b> B, and a lower support column portion 13 that is fitted and supported by the bearing tool 11. The outer ring 14 is formed in an upper constricted cylinder having a substantially C-shaped cross section, and the upper end portion of the outer peripheral surface 14 a is fitted and supported by the outer ring receiver 12. Then, the annular rubber layers 18 to 20 and the intermediate rings 16 and 17 having a cross-sectional shape are stacked across the conical outer peripheral surface 13a of the conical shaft portion 13A and the inclined inner peripheral surface 14b of the outer ring 14. Has been deployed. Therefore, most of the vertical axis 13 is configured to protrude downward with respect to the outer ring 14 in the direction of the vertical axis P.

  As shown in FIG. 2, the vibration isolator 10 is equipped with a protective cover 21 that covers the elastic body 15 so that the lower end side thereof is exposed to the outside. The protective cover 21 has an outer end portion 21G that is externally supported by a vertical outer peripheral surface 14c formed at the lower end portion of the outer ring 14, and an inner end that is externally supported by the lower end portion of the conical shaft portion 13A of the vertical axis 13. Stepped substantially comprising a portion 21N, an annular vertical wall 21A following the outer end portion 21G, and a circular horizontal wall 21B continuing smoothly from the lower end of the annular vertical wall 21A and bending to the inner end portion 21N It is made of a cylindrical and flexible material. Examples of the material include rubber and sheet material made of synthetic resin. Each of the outer and inner end portions 21G and 21N is fixed to the outer ring 14 and the longitudinal axis 13 using a plate ring 22 made of metal or synthetic resin and a fastener (tension band) 24 made of a bolt / nut 23.

  When the vibration isolator 10 is assembled to the carriage 2, the vertical axis 13 and the outer ring 14 are moved (vibrated) in small increments from side to side, front and rear, and up and down due to traveling vibration and the like. Since the protective cover 21 provided across the longitudinal axis 13 and the outer ring 14 that often move relatively in three dimensions is made of a flexible material, it can follow the three-dimensional movement by being flexibly deformed. Thus, the lower end side of the elastic body 15 can always be covered so as not to be exposed to the outside. In addition, one or more small-diameter drain holes 25 are formed in the circular horizontal wall 21B, and it adheres to dew water due to changes in weather conditions before and after the protective cover 21 is assembled to the vibration isolator 10 or during manufacturing. Even after the assembled moisture is assembled, it can be discharged to the outside of the protective cover 21. The drain hole 25 can also function as an air movement hole (air vent hole) inside and outside the cover when the protective cover 21 is deformed, and may be a small-diameter insertion hole.

  Since the vibration isolator 10 with the protective cover 21 is thus provided, the steam and snow melting agent sprayed to melt the snow on and around the track in a cold region, or salt water and sea breeze due to running along the coast are vibration proof. Even if it reaches the tool 10, it is prevented from reaching the elastic body 15 by the protective cover 21 (so as not to be exposed), and the vertical axis 13, the outer ring 14, or the intermediate rings 16, 17 and the rubber layers 18 to The vulcanization adhesion part (an example of an adhesion part) with 20 peels off, and obstruction of the elastic body 15, such as a crack and material deterioration comes to be eliminated. That is, the attachment of the protective cover 21 prevents the quality and durability of the vibration isolator 10 from being deteriorated early due to various external factors, and the vibration isolator having excellent reliability that functions well over a long period of time. 10 can be realized. In addition, when this protective cover 21 is used in a cold region or a heavy snowfall region, it is often called a “snowproof cover” because it mainly prevents intrusion of snow, a snow melting agent, and snow melting steam.

[Example 2]
As shown in FIG. 3, the vibration isolator 10 according to the second embodiment includes an annular vertical wall 21 </ b> A and a circular horizontal wall 21 </ b> B that are portions between the outer end 21 </ b> G and the inner end 21 </ b> N in the protective cover 21. The other parts are the same as those of the vibration isolator 10 according to the first embodiment. It is a means that can be made into a “flexible material” in the shape of a bellows, and in addition to rubber and synthetic resin, a metal such as a steel plate, a hard plastic, etc. are used as the material of the protective cover 21. Is possible. By making the annular vertical wall 21A and the circular horizontal wall 21B into bellows-like walls 28, 29, the follow-up displacement of the protective cover 21 when the vertical displacement 13 and the outer ring 14 are relatively displaced is smoothed, and the allowable elastic displacement amount is increased. There is also an advantage of increasing. Although not shown, it is desirable to provide a hole for removing water or air at the lower end of the horizontal bellows-like wall 28.

Example 3
The vibration isolator 10 according to the third embodiment is different from that of the first embodiment only in the structure of the protective cover 21, and only the protective cover 21 is shown in FIG. As shown in FIG. 4, the protective cover 21 according to the third embodiment has a substantially C shape when viewed in the direction of the axis Y of the vertical axis 13, and has an opening 21 </ b> K formed between both ends 21 t and 21 </ b> T. It is composed of a single molding material that can be fitted to the outer ring 14 and the longitudinal axis 13 from the lateral side by opening. The one end portion 21t is integrally formed with a plurality of engaging portions 26 including a distal end portion 26a for picking and pulling with a finger, a collar portion 26b, and a shaft portion 26c. In the portion 21T, engaging holes 27 that are closely fitted to the shaft portion 26c are formed at a plurality of corresponding positions.

  That is, it is a molded product having an outer end 21G, an inner end 21N, an annular vertical wall 21A, and a circular horizontal wall 21B and having an opening 21K, and materials such as rubber, elastomer, and soft plastic can be used. is there. The opening width of the opening 21K may be relatively narrow as shown in the figure, or may be set wider (not shown). For example, as shown in FIG. 4, the end 21 t with the engagement portion 26 has a thickness of a predetermined length in the circumferential direction as a half on the inner diameter side, and the end 21 T with the engagement hole 27 has a circumferential direction. It is preferable to set the thickness corresponding to the predetermined length to a half on the outer diameter side so as to have a constant thickness in the assembled state.

  In actual mounting, both ends 21t and 21T are pulled away from each other with fingers or the like to displace the opening 21K, and in this state, the protective cover 21 is moved laterally to pass through the outer ring 14 and the vertical axis 13. Then, after bringing both end portions 21t and 21T so that the opening 21K disappears, each engaging portion 26 is inserted into the corresponding engaging hole 27 as shown in the partial action diagram below the plane of FIG. Thus, the protective cover 21 can be provided over the outer ring 14 and the longitudinal axis 13 so that the elastic body 15 is covered and hidden. In this case, as in the first embodiment, a pair of large and small fasteners 24, 24 may be used to be securely fitted and supported.

  In the protective cover 21 according to the third embodiment, since the vibration isolator 10 can be freely assembled and disassembled from the lateral side, the vibration isolator 10 is removed from, for example, the current railcar carriage 2. There is a convenience that the protective cover 21 can be retrofitted without any trouble. Note that the means for connecting the two end portions 21t and 21T may be other than the configuration of the engaging portion 26 and the engaging hole 27, such as a means for sticking or a means for bolting.

Example 4
The vibration isolator 10 according to the fourth embodiment is different from that of the first embodiment only in the structure of the protective cover 21, and only the protective cover 21 is shown in FIG. As shown in FIGS. 5 (a) and 5 (b), the protective cover of the fourth embodiment is viewed in the direction of the axis Y of the vertical axis 13 so that the outer ring 14 and the vertical axis 13 can be mounted from the lateral side. The first and second cover portions 31 and 32 have a substantially semicircular arc shape. Each cover part 31 and 32 is the same component, and is attached to the vibration isolator 10 by the mounting means by the engaging part 26 and the engaging hole 27 mentioned above.

  The first cover portion 31 will be described. The first cover portion 31 includes a large-diameter semicircular portion 31A located on the outer ring 14 and a small-diameter semicircular portion 31B located on the vertical axis 13, and a plurality of engagements on one peripheral end 31t. A plurality of engagement holes 27 are formed in the portion 26 and the other peripheral end 31T. Corresponding numbers are appended to corresponding portions in the second cover portion 32. The protective cover 21 according to the fourth embodiment also has the convenience that the protective cover 21 can be retrofitted to the vibration isolator 10. Note that the means for connecting the both end portions 31t and 31T may be other than the configuration of the engaging portion 26 and the engaging hole 27, such as a means for sticking or a means for bolting.

Example 5
The vibration isolator 10 according to the fifth embodiment is different from that of the first embodiment only in the structure of the protective cover 21, and only the protective cover 21 is shown in FIG. As shown in FIG. 6, the protective cover 21 of the fifth embodiment has an outer end portion 41 that is externally supported by the end portion of the outer ring 14, and a predetermined interference avoidance inner gap sk on the vertical axis 13. It is configured in a stepped cylindrical shape having an enclosed inner end portion 42. The inner gap sk for avoiding interference is set to a value that covers the maximum relative displacement between the outer ring 14 and the vertical axis 13, and as a result, the material of the protective cover 21 can be an elastic or flexible material such as rubber, soft plastic, or elastomer. In addition to a material having flexibility, a material having no elasticity or flexibility (a material having a self-shaping property) such as metal, hard plastic, and hard rubber is also possible.

Example 6
The vibration isolator 10 according to the sixth embodiment is different from that of the first embodiment only in the structure of the protective cover 21, and only the protective cover 21 is shown in FIG. As shown in FIG. 7, the protective cover 21 of the sixth embodiment has an inner end 52 that is externally supported by the vertical axis 13 and a predetermined interference avoiding outer gap dk at the end of the outer ring 14. It has a cylindrical shape having an outer end portion 51 and is provided with self-shaping property. The interference avoidance outer gap dk is set to a value that covers the maximum relative displacement between the outer ring 14 and the longitudinal axis 13, and as a result, the material of the protective cover 21 can be an elastic or flexible material such as rubber, soft plastic, or elastomer. In addition to a material having flexibility, a material having no elasticity or flexibility (a material having a self-shaping property) such as metal, hard plastic, and hard rubber is also possible.

  In the protective cover 21 of the fifth embodiment having the interference avoidance inner gap sk on the lower side as a cover, it is difficult for foreign matters such as snow, water and dust to enter the protective cover 21, and even if it enters, it is discharged by gravity. This is advantageous in comparison with the protective cover 21 of the sixth embodiment. In addition, in the protective cover 21 of the fifth and sixth embodiments, a structure having a C-shape in a plan view as in the third embodiment or a plan view as in the fourth embodiment so that it can be retrofitted to the vibration isolator 10. It is possible to adopt a split structure with a semicircular shape.

[Another Example]
As shown in FIG. 8, the outer cover 14 is provided with an annular circumferential groove 61 and a circumferential ridge 62 that can be fitted into the circumferential groove 61, as shown in FIG. 8. By forming each on the outer end portion 21G, the protective cover 21 can be more firmly attached to the outer ring 14 without being displaced. In this structure, the relationship between the vertical axis 13 and the protective cover 21 can be applied. Further, the protective cover 21 has a shape whose cross section is drawn on the right side of the axis Y in FIG. 2 and is made of a long material having flexibility and elasticity set to an appropriate length. It is also possible to use a structure that is wound around the outer ring 14 and the outer ring 14.

  The vibration isolator 10 with the protective cover 21 according to the present invention is used as a vibration isolator for a vehicle such as a railway vehicle bogie, a construction machine such as a bus, a truck car, a large off-road truck or a dozer work vehicle, or an industrial vehicle. It is possible.

Side view of the main part showing the bogie for railway vehicles Side view of a partially cutout showing a vibration isolator with a protective cover (Example 1) Side view of a partially cutout showing a bellows-shaped vibration isolator with a protective cover (Example 2) The perspective view which shows the protective cover by Example 3 The protection cover by Example 4 is shown, (a) is a top view, (b) is a side view. Side view of vibration isolator with protective cover fitted and supported only on outer ring (Example 5) Side view of a vibration isolator with a protective cover fitted and supported only on the shaft (Example 6) Sectional drawing of the principal part which shows the fitting structure of the groove | channel and convex strip in a protective cover and an outer ring | wheel

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration isolator 13 Shaft 14 Outer ring 15 Elastic body 21 Protective cover 21G Outer end part 21K Opening part 21N Inner end part 25 Drain hole 31 First cover part 32 Second cover part 41 Outer end part 42 Inner end part 51 Outer end Part 52 Inner end part 16, 17 Intermediate wheel 18-20 Rubber layer sk Interference avoidance inner gap dk Interference avoidance outer gap Y-axis (vibration isolator) axis

Claims (8)

An anti-vibration device for a vehicle in which an annular elastic body is bonded and integrated between a shaft and an outer ring,
A vehicle vibration isolator equipped with a protective cover that covers or prevents the elastic body from being exposed to the outside.   The elastic body is configured by alternately providing one or more intermediate rings and two or more rubber layers in the radial direction, and each rubber layer corresponds to the intermediate ring, the shaft, or the outer ring. The vehicular vibration isolator according to claim 1, which is integrated with the object to be cured by vulcanization adhesion.   The said protective cover is comprised by the material which has an outer end part by which external fitting is supported by the edge part of the said outer ring | wheel, and an inner end part by which external fitting is supported by the said shaft, and has flexibility. The vehicle vibration isolator according to 1 or 2.   The protective cover is externally supported by an outer end supported by the end of the outer ring and an inner end surrounded by a predetermined interference avoidance gap on the shaft, or is externally supported by the shaft. 3. The vehicle protection device according to claim 1, wherein the vehicle protection device has a cylindrical shape having an inner end portion and an outer end portion surrounded by a predetermined interference avoidance gap at an end portion of the outer ring. Shaker.   The vehicle vibration isolator according to any one of claims 1 to 4, wherein a portion of the protective cover between the outer end portion and the inner end portion is formed in a bellows shape.   The protective cover is substantially C-shaped when viewed from the axial direction of the shaft, and is formed of a single molding material that can be fitted into the outer ring and the shaft from the lateral side by opening the opening. The vehicle vibration isolator according to any one of claims 1 to 5.   The protective cover includes first and second cover portions that have a substantially semicircular arc shape when viewed in the axial direction of the shaft so that the protective cover can be attached to the outer ring and the shaft from the lateral side. The vehicle vibration isolator according to any one of claims 1 to 5. The vehicle vibration isolator according to any one of claims 1 to 7, wherein a drain hole is formed in a lower end portion of the protective cover.

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