JP2007078045A - Damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping device in which the settable range of spring constant is increased, while surely positioning the swollen part. <P>SOLUTION: Since The projected parts 6c of inner molds 6 are fitted to positioning grooves 5c to fix an inner tube 1 in the circumferential direction, the inner molds 6 will not need to be brought into contact with a large-diameter part 5b. Namely, clearances W can be formed between the inner molds 6 and the large-diameter parts 5b of the swollen part 5. Since not only the thickness of a recessed part 4 but also the peripheral length of a recessed part 4 can be set freely by the amount corresponding to the clearances W, the settable range of the spring constant can be increased by the amount of freely settable length of the recessed part 4 in the circumferential direction, while surely performing relative positioning of the inner tube 1 to the outer tube 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-vibration device, and more particularly to an anti-vibration device that can widen a settable range of a spring constant while reliably positioning a bulging portion.

  An anti-vibration device in which an inner cylinder and an outer cylinder are connected by an anti-vibration base made of a rubber-like elastic body is used in a vehicle such as an automobile. In the vibration isolator having such a configuration, the irregular shape of the inner cylinder is set so that the spring constants such as the twisting direction, the twisting direction, the central axis direction, or the direction perpendicular to the central axis are set to predetermined values. And providing a straight portion on the vibration-proof base.

  For example, in Japanese Patent Application Laid-Open No. 2001-241490, a pair of bulging portions are formed in an inner cylinder, and the pair of bulging portions are opposed to each other with the central axis of the inner cylinder interposed therebetween, thereby causing the opposed directions to face each other. A technique for increasing the value of the spring constant is described.

  On the other hand, in Japanese Patent Application Laid-Open No. 2003-166575, a pair of straight portions extending along the central axis of the inner cylinder and opposed to each other with the central axis of the inner cylinder interposed therebetween are provided in the rubber-like elastic body so that the opposite directions are provided. A technique for reducing the value of the spring constant is described. As described above, the spring constant can be set for each direction by forming the bulging portion on the inner cylinder or forming the curled portion on the rubber-like elastic body.

  There is also an anti-vibration device formed by combining both the bulging portion and the straight portion. According to this vibration isolator, the two-way spring ratio can be set to a larger value. Such a vibration isolator will be described with reference to FIGS. 11 is a view showing a conventional vibration isolator 200, FIG. 11 (a) is a top view of the vibration isolator 200, and FIG. 11 (b) is a XIb-XIb line in FIG. 11 (a). It is sectional drawing of the vibration isolator 200 in FIG.

  12 is a schematic diagram for explaining a method of manufacturing the vibration isolator 200, FIG. 12 (a) is a top view of the inner cylinder 101 and the like, and FIG. 12 (b) is a plan view of FIG. It is sectional drawing of the inner cylinder 101 grade | etc., in the XIIb-XIIb line | wire of a). FIG. 12 is a schematic view showing a state in which the inner cylinder 101 and the like are installed in a vulcanization mold. However, in FIG. 12, the upper mold and the lower mold are not shown, and only the middle mold 106 that forms the straight portion 104 is illustrated.

  As shown in FIG. 11, the conventional vibration isolator 200 includes a cylindrical inner cylinder 101, a bulging portion 105 formed in an annular shape on a part of the outer surface of the inner cylinder 101, and an interval outside the inner cylinder 101. And a rubber-like elastic body 103 that is interposed between the inner cylinder 101 and the outer cylinder 102 and has a straight portion 104 that extends along the central axis of the inner cylinder 101. It is prepared for.

  Further, as shown in FIG. 11, the bulging portion 105 includes two small diameter portions 105a that are positioned to face the straight portion 104, and two large diameter portions 105b that are formed to have a larger diameter than the small diameter portion 105a. In addition, the small-diameter portions 105 a and the large-diameter portions 105 b are alternately arranged in the circumferential direction of the inner cylinder 101.

As shown in FIG. 11A, the straight portion 104 is formed up to a position in contact with the large diameter portion 105 b of the bulging portion 105. Thereby, at the time of manufacture, as shown in FIG. 12, when the middle mold 106 for forming the straight portion 104 is in contact with the large diameter portion 105b, the bulging portion 105 can be fixed in the circumferential direction without rotating. . As a result, it is possible to prevent the spring constant set to a predetermined value from changing in each direction (for example, the vertical direction and the horizontal direction in FIG. 11A).
JP 2001-241490 A JP 2003-166575 A

  However, as in the conventional vibration isolator 200 described above, when the middle mold 106 is sized so as to be in contact with the large-diameter portion 105b, the bulging portion 105 is positioned in the circumferential direction. There is a problem that it is impossible to freely set the length in the circumferential direction. As a result, the spring constant cannot be set to a desired value other than adjusting the thickness dimension of the straight portion 104 (thickness in the direction perpendicular to the central axis of the inner cylinder 101), and accordingly, the spring constant is set accordingly. There was a problem that the possible range narrowed.

  The present invention has been made to solve the above-described problems, and provides a vibration isolator capable of widening a settable range of a spring constant while reliably positioning a bulge portion. It is an object.

  In order to achieve this object, a vibration isolator according to claim 1 includes a cylindrical inner cylinder, a bulging portion formed in an annular shape on a part of the outer surface of the inner cylinder, and an outer side of the inner cylinder. A rubber-like elastic body having a cylindrical outer cylinder arranged at intervals, and a straight portion interposed between the inner cylinder and the outer cylinder and extending along the central axis of the inner cylinder An anti-vibration base composed of the following: the bulging portion includes two small-diameter portions positioned opposite to the straight portion, and two large-diameter portions formed to have a larger diameter than the small-diameter portion. In addition, the small-diameter portion and the large-diameter portion are alternately arranged in the circumferential direction of the inner cylinder, and the small-diameter portion of the bulging portion is recessedly provided on a surface facing the straight portion. A positioning groove extending along the central axis and protruding from a vulcanization mold for forming a straight portion of the vibration-proof base. They are projections and fittably configurations.

  The vibration isolator according to claim 2 is the vibration isolator according to claim 1, wherein a gap is provided between the straight portion and the large diameter portion of the bulge portion.

  The vibration isolator according to claim 3 is the vibration isolator according to claim 1 or 2, wherein the inner cylinder includes at least a plurality of groove portions recessed in a portion to which the bulging portion adheres, The groove portions are arranged in a lattice shape, and the cross-sectional shape of each groove portion is formed in a V shape.

  The vibration isolator according to claim 4 is the vibration isolator according to any one of claims 1 to 3, wherein the two straight portions are provided at positions facing each other across the inner cylinder, and the bulging portion And the straight portion are configured to be axisymmetric with respect to the central axis of the inner cylinder.

  According to the vibration isolator of claim 1, the small-diameter portion of the bulging portion includes the positioning groove that is recessed in the surface facing the straight portion, and the positioning groove extends along the central axis of the inner cylinder. At the same time, since it is configured to be able to be fitted with a convex portion provided on the vulcanization mold for forming the straight portion of the vibration isolating base, the bulging portion is rotated in the circumferential direction by such fitting. There is an effect that it can be prevented. As a result, there is an effect that the bulging portion can be reliably positioned in the circumferential direction.

  Further, if the bulging portion can be positioned by the positioning groove in this way, it is not necessary to make the tick portion contactable with the large diameter portion as in the conventional product, and the circumferential length of the tick portion is not required. Since the spring constant can be set freely, the settable range of the spring constant can be further widened.

  According to the vibration isolator of claim 2, the same effect as the vibration isolator of claim 1 is obtained, and a gap is provided between the straight portion and the large diameter portion of the bulge portion. There is an effect that the spring constant can be set in a wider range. That is, in the conventional product, there is no gap between the straight part and the large diameter part, so the spring constant is not limited to adjusting the thickness of the straight part (thickness in the direction perpendicular to the central axis of the inner cylinder). There was no way to set. On the other hand, according to the vibration isolator of the present invention, since the gap is provided between the straight portion and the large diameter portion, not only the thickness dimension of the straight portion but also the circumferential length can be freely set. can do. As a result, the spring constant can be easily changed and the spring constant can be set in a wider range by simply changing the shape of the vulcanization mold for forming the straight portion.

  According to the vibration isolator of claim 3, the same effect as the vibration isolator according to claim 1 or 2 is obtained, and the inner cylinder has a plurality of groove portions at least at a portion where the bulging portion adheres. Since the groove portions are arranged in a lattice shape, the following effects are obtained.

  That is, when the resin material enters the groove, even if stress is applied in the twisting direction, the twisting direction, the central axis direction, or the direction perpendicular to the central axis, the positional deviation of the bulging portion with respect to the inner cylinder is prevented. There is an effect that can be done. As a result, there is an effect that the relative position of the inner cylinder and the bulging portion can be maintained and the function as the vibration isolator can be surely exhibited.

  Moreover, since the cross-sectional shape of each groove part is formed in V shape, the cross-sectional shape of the tool which forms a groove part can also be made into a V-shaped convex part. Thereby, as compared with a tool whose cross-sectional shape is a semicircle, a square, or the like, the groove portion can be processed with a smaller load, which has an effect of reducing the processing cost. Furthermore, there is an effect that high-precision processing can be performed and productivity can be improved.

  According to the vibration isolator of claim 5, in addition to having the same effect as the vibration isolator according to any of claims 1 to 3, the two straight portions are opposed to each other across the inner cylinder. Since the bulging part and the straight part are configured to be axially symmetric with respect to the central axis of the inner cylinder, when installing the inner cylinder at a predetermined position in the vulcanization mold, Combinations of directions (rotation directions) can be increased. Therefore, the workability of installing the inner cylinder in the vulcanization mold is improved, and the productivity is increased correspondingly.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1A is a top view of a vibration isolator 100 according to an embodiment of the present invention, and FIG. 1B is a front view of the vibration isolator 100. 2A is a cross-sectional view of the vibration isolator 100 taken along the line IIa-IIa in FIG. 1A, and FIG. 2B is a bottom view of the vibration isolator 100.

  As shown in FIGS. 1 and 2, the vibration isolator 100 according to the present embodiment includes a cylindrical inner cylinder 1, a bulging portion 5 formed in an annular shape on a part of the outer surface of the inner cylinder 1, A cylindrical outer cylinder 2 disposed at an interval on the outer side of the cylinder 1, and a straight portion 4 interposed between the inner cylinder 1 and the outer cylinder 2 and extending along the central axis of the inner cylinder 1. And a vibration-proof substrate 3.

  As shown in FIG. 1A, the bulging portion 5 includes two small-diameter portions 5a and two large-diameter portions 5b formed to have a larger diameter than the small-diameter portion 5a. The diameter portions 5 b are alternately arranged in the circumferential direction of the inner cylinder 1. A positioning groove 5 c extending along the central axis of the inner cylinder 1 is formed in the small diameter portion 5 a of the bulging portion 5 on the surface facing the straight portion 4.

  Thus, the convex portion 6a of the vulcanization mold (medium die 6) for forming the straight portion 4 is fitted into the positioning groove 5c, thereby preventing the inner cylinder 1 from rotating in the circumferential direction and The positioning of the protruding portion 5 in the circumferential direction can be performed. The straight portion 4 includes a recess 4a formed corresponding to the positioning groove 5c. Further, the cross sections of the concave portion 4a and the positioning groove 5c of the straight portion 4 are formed to be curved in an arc shape.

  Next, the inner cylinder 1 will be described with reference to FIGS. 3 and 4. FIG. 3A is a front view of the inner cylinder 1, and FIG. 3B is a bottom view of the inner cylinder 1. 4A is a cross-sectional view of the inner cylinder 1 taken along the line IVa-IVa in FIG. 3B, and FIG. 4B is an enlarged view of the portion indicated by A in FIG. 4A. It is the partial expanded sectional view shown.

  As shown in FIGS. 3 and 4, the inner cylinder 1 is formed of a steel material into a cylindrical cylindrical body having a central axis O, and a plurality of groove portions 10 are provided on the outer surface of the inner cylinder 1 over the entire circumference. ing. Each groove part 10 is a groove part for receiving the resin material which comprises the bulging part 5, and holding the bulging part 5 to the inner cylinder 1 firmly, and is formed by knurling.

  As shown in FIGS. 3 and 4, the grooves 10 are arranged in a lattice pattern at intervals Z on the outer surface of the inner cylinder 1, and are formed in a V-shaped cross section having a depth X and an opening width Y. In this embodiment, the pitch Z is set to 1.5 mm, the depth X is set to 0.5 mm, and the opening width Y is set to 0.5 mm.

  Thus, since the groove part 10 is provided in the outer surface of the inner cylinder 1 and is arranged in a lattice shape, when the resin material enters the groove part 10, the twisting direction, the twisting direction, and the central axis O direction. Alternatively, even when a stress is applied in a direction perpendicular to the central axis O, it is possible to prevent the displacement of the bulging portion 5 with respect to the inner cylinder 1. As a result, the relative positions of the inner cylinder 1 and the bulging portion 5 can be maintained, and the function as the vibration isolator 100 can be reliably exhibited.

  Moreover, since the cross-sectional shape of each groove part 10 is formed in V shape, as shown in FIG. 4, the cross-sectional shape of the tool for forming the groove part 10 can also be made into a V-shaped convex part. . Thereby, compared with a tool whose cross-sectional shape is a semicircle, a square, or the like, the processing of the groove 10 can be performed with a smaller load, so that the processing cost can be suppressed. Furthermore, high-precision processing is possible and productivity can be improved.

  Here, as described above, the grooves 10 are arranged in a grid pattern with a pitch Z of 1.5 mm intervals, and are formed in a V shape having a depth X = 0.5 mm and an opening width Y = 0.5 mm. Therefore, the bulging portion can be firmly fixed to the inner cylinder while reducing the processing cost.

  That is, when the opening width Y of the groove portion 10 is smaller than 0.5 mm, it is difficult for the resin material to enter the groove portion 10. On the other hand, when the opening width Y is larger than 0.5 mm, the depth X of the groove portion 10 is considered to be fixed. Then, since the cross-sectional angle at the top of the convex portion of the tool becomes large, a large processing force is required for forming the groove portion 10, which causes an increase in processing cost.

  Further, when the depth X of the groove 10 is smaller than 0.5 mm, when the opening width Y of the groove 10 is considered to be fixed, the cross-sectional angle at the top of the convex portion of the tool becomes large. Therefore, a large processing force is required, resulting in an increase in processing cost. On the other hand, when the depth of the groove portion 10 is larger than 0.5 mm, the deeper groove portion 10 is formed as compared with the case where the height of the convex portion of the tool is 0.5 mm. Processing power is required, which increases processing costs.

  Further, when the pitch Z of the groove portions 10 is set to an interval of less than 1.5 mm, the number of grooves 10 formed per unit area is smaller than when the pitch Z of the groove portions 10 is set to an interval of 1.5 mm. Since the processing force increases and a larger processing force is required, the processing cost increases accordingly. On the other hand, when the pitch Z of the groove portion 10 is set to an interval larger than 1.5 mm, the number of the groove portions 10 per unit area is reduced as compared with the case where the pitch Z of the groove portion 10 is set to an interval of 1.5 mm. The effect of holding and fixing the bulging portion 5 to the inner cylinder 1 cannot be exhibited to the maximum extent.

  On the other hand, according to the vibration isolator 100 of the present invention, the cross-sectional shape of the groove 10 is set to a V shape having a depth X = 0.5 mm and an opening width Y = 0.5 mm, and the pitch of the groove 10 is set. Since Z is set at an interval of 1.5 mm, the above-described problems can be solved and the bulging portion can be firmly fixed to the inner cylinder while reducing the processing cost.

  Next, with reference to FIG.5 and FIG.6, the inner cylinder 1 and the bulging part 5 are demonstrated. FIG. 5A is a front view of the inner cylinder 1 and the bulging portion 5, and FIG. 5B is a bottom view of the inner cylinder 1 and the bulging portion 5. 6A is a cross-sectional view of the inner cylinder 1 and the bulging portion 5 taken along the line VIa-VIa in FIG. 5B, and FIG. 6B is indicated by B in FIG. 6A. It is the elements on larger scale which expanded and showed the part which expanded.

  The bulging portion 5 is a portion made of a resin material, and is formed in an annular shape at a position corresponding to the groove portion 10 recessed in the inner cylinder 1 as shown in FIGS. 5 and 6. The bulging portion 5 is a portion formed by injection molding. As described above, the small diameter portions 5a and the large diameter portions 5b are alternately arranged, and the positioning groove 5c is recessed on the surface of the small diameter portion 5a. It is installed.

  Examples of the resin material forming the bulging portion 5 include polyamides such as nylon 6 and nylon 6, resin materials called polyethylene terephthalate, polybutylene terephthalate, and polyphenylene sulfide.

  These exemplified resin materials and the like enter the groove portion 10 of the inner cylinder 1 and adhere to the inner cylinder 1 when the bulging portion 5 is formed by injection molding. Thus, by forming the bulging portion 5 with a resin material, the positioning groove 5c can be easily processed and the processing cost can be reduced as compared with the case where the bulging portion 5 is made of a metal material. Further, since the resin material is lighter than the metal, the weight of the vibration isolator 100 as a whole can be reduced.

  Next, the outer cylinder 2 will be described with reference to FIG. FIG. 7A is a top view of the outer cylinder 2, FIG. 7B is a front view of the outer cylinder 2, and FIG. 7C is a bottom view of the outer cylinder 2.

  As shown in FIG. 7, the outer cylinder 2 is made of a steel material and is formed into a cylindrical cylindrical body having a central axis O, and at the lower end (downward in FIG. 7B), the flange portion 2 a is radially outward. Overhang is formed. The outer cylinder 2 is set to have a smaller length in the direction of the central axis O than the inner cylinder 1 (see FIG. 1 or FIG. 2) and is concentrically disposed outside the inner cylinder 1.

  Next, a method for manufacturing the vibration isolator 100 will be described with reference to FIG.

  FIG. 8 is a schematic view showing a state in which the inner cylinder 1 or the like is installed in a vulcanization mold, FIG. 8 (a) is a top view of the inner cylinder 1 or the like, and FIG. It is sectional drawing of the inner cylinder 1 grade | etc., In the VIIIb-VIIIb line | wire of (a). The vulcanization mold is composed of an upper mold, a lower mold, and a middle mold 6 for forming the straight portion 4, and in FIG. 8, in order to simplify the drawing and facilitate understanding, The upper mold and the lower mold are not shown, and only the middle mold 6 is illustrated.

  When manufacturing the vibration isolator 100, first, the bulging part 5 is formed on the outer surface of the inner cylinder 1, and then, as shown in FIG. 8, the inner cylinder 1 and the outer cylinder in which the bulging part 5 is already formed. 2 is installed on the lower mold, the middle mold 6 is installed between the inner cylinder 1 and the outer cylinder 2, and the upper mold is fastened to the lower mold. As a result, a sealed vulcanization space is formed between the upper and lower molds and the inner and outer cylinders 1 and 2, so that unvulcanized rubber-like elastic material is injected and the vulcanization mold is pressurized. Heat. As a result, the anti-vibration base 3 having a shape corresponding to the vulcanization space, that is, the straight hole 4 corresponding to the middle die 6 is vulcanized and the manufacture of the anti-vibration device 100 is completed.

  Here, as described above, the positioning groove 5c is recessed in the small diameter portion 5a of the bulging portion 5, and the protrusion 6a of the middle mold 6 can be fitted into the positioning groove 5c. Thereby, the inner cylinder 1 can be prevented from rotating in the circumferential direction, and the bulging portion 5 can be positioned.

  Further, since the bulging portion 5 is configured in a shape that is axially symmetric with respect to the central axis O of the inner cylinder 1, a middle mold is formed between the inner cylinder 1 and the outer cylinder 2 in which the bulging portion 5 is formed. When 6 is installed (or when the inner cylinder 1 is installed in a vulcanization mold in which the middle mold 6 is already installed), the combinations of orientations that can be installed can be increased. Thereby, the workability | operativity at the time of installing the inner cylinder 1 in which the bulging part 5 was formed in a vulcanization metal mold | die improves, and it can raise productivity correspondingly.

  Furthermore, since the inner cylinder 1 can be fixed in the circumferential direction by fitting the projection 6c of the middle die 6 and the positioning groove 5c, the middle die 6 is brought into contact with the large diameter portion 5b as in the conventional product. There is no need. That is, a gap W can be formed between the middle mold 6 and the large diameter portion 5 b of the bulging portion 5.

  Therefore, according to the vibration isolator 100 in the present embodiment, not only the thickness of the straightening portion 4 but also the circumferential length of the straightening portion 4 can be freely set by the gap W. As long as the length in the circumferential direction of the portion 4 can be freely set, the settable range of the spring constant can be made wider while the relative positioning of the inner cylinder 1 and the outer cylinder 2 is reliably performed.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  For example, in the above embodiment, the case where the positioning groove 5c is formed in each of the two small diameter portions 5a has been described. However, the present invention is not necessarily limited to this, and the positioning groove is formed in only one of the two small diameter portions 5a. The structure which forms 5c may be sufficient. Further, the number of positioning grooves 5c formed in each small diameter portion 5a may be one, or may be two or more.

  Here, with reference to FIG. 9, the modification of the bulging part 5 formed in the inner cylinder 1 is demonstrated. In addition, about the part same as the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. FIG. 9A is a top view of the bulging portion 15 in the first modification, and FIG. 9B is a front view of the bulging portion 15. FIG. 9C is a top view of the bulging portion 25 in the second modified example, and FIG. 9D is a front view of the bulging portion 25.

  In the bulging portion 15 in the first modified example, a positioning groove 15 c is extended to the middle of the bulging portion 15 as shown in FIGS. 9 (a) and 9 (b). As described above, the positioning groove 15c formed in the bulging portion 15 is formed only halfway in the direction along the axis O direction of the bulging portion 15 as long as it can be inserted into the middle mold 6 (see FIG. 8). May be. That is, it is not necessary to extend the entire bulging portion 15 along the central axis O.

  On the other hand, as shown in FIGS. 9 (c) and 9 (d), two positioning grooves 5c are formed in each small diameter portion 5a of the bulging portion 25 in the bulging portion 25 in the second modification. Has been. In this case, the positioning groove 5c may be arranged at a position that is axially symmetric with respect to the central axis O of the inner cylinder.

  In the above embodiment, the case where the positioning groove 5c is formed in a circular arc shape has been described. However, the shape is not necessarily limited to this shape, and other shapes can naturally be adopted. Examples of other shapes include a V-shaped cross section and a W-shaped cross section.

  Here, with reference to FIG. 10, the other modification of the bulging part 5 is demonstrated. FIG. 10A is a top view of the bulging portion 35 in the third modification, and FIG. 10B is a front view of the bulging portion 35. FIG. 10C is a top view of the bulging portion 45 in the fourth modification, and FIG. 10D is a front view of the bulging portion 45. As shown in FIG. 10, the bulging portions 35 and 45 are formed with positioning grooves 35c and 45c having a V-shaped cross section and a W-shaped cross section.

  You may comprise the vibration isolator 100 combining 1 or 2 or more of each said modification.

(A) is a top view of the vibration isolator in one embodiment of the present invention, and (b) is a front view of the vibration isolator. (A) is sectional drawing of the vibration isolator in the IIa-IIa line | wire of Fig.1 (a), (b) is a bottom view of a vibration isolator. (A) is a front view of an inner cylinder, (b) is a bottom view of an inner cylinder. (A) is sectional drawing of the inner cylinder in the IVa-IVa line of FIG.3 (b), (b) is the partial expanded cross section which expanded and showed the part shown by A of Fig.4 (a). FIG. (A) is a front view of an inner cylinder and a bulging part, (b) is a bottom view of an inner cylinder and a bulging part. (A) is sectional drawing of the inner cylinder and bulging part in the VIa-VIa line | wire of FIG.5 (b), (b) further expands and shows the part shown by B of Fig.6 (a). FIG. (A) is a top view of an outer cylinder, (b) is a front view of an outer cylinder, (c) is a bottom view of an outer cylinder. It is a schematic diagram which shows the state which installed the inner cylinder etc. in the vulcanization mold, (a) is a top view of an inner cylinder etc., (b) is sectional drawing in the VIIIb-VIIIb line | wire of Fig.8 (a) It is. (A) is a top view of the bulging part in a 1st modification, (b) is a front view of a bulging part. Moreover, (c) is a top view of the bulging part in the second modification, and (d) is a front view of the bulging part. (A) is a top view of the bulging part in a 3rd modification, (b) is a front view of a bulging part. Moreover, (c) is a top view of the bulging part in the fourth modification, and (d) is a front view of the bulging part. (A) is a top view of a conventional vibration isolator, and (b) is a cross-sectional view of the vibration isolator taken along line XIb-XIb in FIG. It is a figure which shows the state which installed the inner cylinder etc. in the vulcanization metal mold | die in the conventional vibration isolator, (a) is a top view of an inner cylinder etc., (b) is XIIb- of FIG. It is sectional drawing in a XIIb line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Anti-vibration base | substrate 4 Straight part 5,15,25,35,45 Swelling part 5a Small diameter part 5b Large diameter part 5c, 15c, 35c, 45c Positioning groove 6 Middle type (To form a straight part) Vulcanization mold)
6a Convex part 10 Groove part
X depth
Y opening width
Z pitch (interval)
W Clearance between the bulging part and the straight part O Center axis

Claims (4)

A cylindrical inner cylinder, a bulging portion formed in an annular shape on a part of the outer surface of the inner cylinder, a cylindrical outer cylinder arranged at intervals on the outer side of the inner cylinder, the inner cylinder, and An anti-vibration base that is interposed between the outer cylinders and has a straight portion extending along the central axis of the inner cylinder and is made of a rubber-like elastic body;
The bulging portion includes two small diameter portions positioned opposite to the straight portion, and two large diameter portions formed larger in diameter than the small diameter portion, and the small diameter portion and the large diameter portion In the vibration isolator arranged alternately in the circumferential direction of the inner cylinder,
The small-diameter portion of the bulging portion includes a positioning groove that is recessed in a surface facing the straight portion,
The positioning groove extends along the central axis, and is configured to be able to fit with a convex portion provided on a vulcanization mold for forming a straight portion of the vibration-proof base. The vibration isolator characterized by carrying out.   The vibration isolator according to claim 1, wherein a gap is provided between the straight portion and the large diameter portion of the bulging portion.   The inner cylinder includes a plurality of grooves recessed at least in a portion to which the bulging portion adheres, and each groove is arranged in a lattice shape on the outer peripheral surface of the inner cylinder, and the cross-sectional shape of each groove is The vibration isolator according to claim 1 or 2, wherein the vibration isolator is formed in a V shape.   Two of the straight portions are provided at positions facing each other with the inner cylinder interposed therebetween, and the bulging portion and the straight portion are configured to be axisymmetric with respect to the central axis of the inner cylinder. The vibration isolator according to any one of claims 1 to 3.

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