JP6172707B2 - Anti-vibration device manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a vibration isolator which can prevent the relates to a method of manufacturing a vibration isolator, decreases especially work efficiency roughed.

  In suspension devices for automobiles and the like, vibration isolators (anti-vibration rubber bushes) in which an inner cylinder and an outer cylinder arranged concentrically are connected by an anti-vibration base composed of a rubber-like elastic body are widely used. This vibration isolator is usually assembled with the shaft body of the fastening device inserted through the inner cylinder and fixed to the mating member, so that the axial end surface of the inner cylinder is in pressure contact with the mating member. Fixed. The vibration isolator is assembled and fixed, absorbs vibration based on elastic deformation of the vibration isolator base, and suppresses vibration transmission between the inner cylinder (the counterpart member side) and the outer cylinder.

  However, if some external force acts to cause the end surface of the inner cylinder of the vibration isolator to slip relative to the mating member, a sliding noise is generated or the vibration damping effect becomes insufficient. Then, in order to prevent relative slip of the inner cylinder with respect to the mating member, a roughing process is performed on the end surface in the axial direction of the inner cylinder (Patent Document 1). In the technique disclosed in Patent Document 1, a jig (pressing tool) having a plurality of protrusions formed on the surface thereof is pressed against the end surface of the inner cylinder, and is plastically deformed by the protrusions of the jig to form the end surface of the inner cylinder. Indentation (indentation) is made, and processing for setting the end surface of the inner cylinder to a predetermined surface roughness is performed.

JP 2004-44657 A

  However, in the conventional technique described above, there is a problem that during roughing, protrusions bite into the end surface of the inner cylinder and the vibration isolator is difficult to come off from the pressing tool. If the vibration isolator bites into the protrusion of the pressing tool and is difficult to come off, an additional work is required to separate the vibration isolating apparatus and the pressing tool, and the work efficiency of the roughing process is reduced by the additional work.

The present invention has been made to solve the above problem, and its object is to provide a method of manufacturing a vibration isolator which can prevent the decrease in work efficiency roughed.

Means for Solving the Problems and Effects of the Invention

According to the manufacturing method of the vibration isolator according to claim 1, the vibration isolating base composed of a rubber-like elastic body is interposed between the outer cylinder and the inner cylinder arranged on the inner peripheral side thereof, and the inner cylinder In the manufacturing method of the vibration isolator in which the mating member is pressed against the axial end surface of the shaft, the pressing tool having a plurality of protrusions with a rounded tip is provided on the end surface. Faced. Next, in the pressing step, the inner cylinder and the pressing tool are relatively moved in the axial direction, and the end face of the pressing tool is pressed against the end face of the inner cylinder. When the protrusion is pressed against the end surface of the inner cylinder, a protruding impression (dent) is formed on the end surface of the inner cylinder. Since the protrusion has a rounded tip, the curvature of the bottom of the recess can be reduced as compared with the case where the tip of the protrusion is formed in a conical shape. The smaller the curvature of the bottom of the dent, the smaller the axial component of the frictional force acting between the dent formed on the inner cylinder and the protrusion. Therefore, it is possible to prevent the protrusion from biting into the axial end surface of the inner cylinder after the pressing step and becoming difficult to be separated by the frictional force. As a result, it is possible to prevent the work efficiency of the roughing process from being lowered.

Press applying member is included angle in a cross section perpendicular to the through end face the tip of the protrusion is set to 9 5 ° ~120 °. By setting the lower limit of included angle between 9 5 °, after the pressing step, difficult away from the convex outs tube by the axial component of the frictional force acting between the recess and protrusion to be formed in the inner cylinder There is an effect that can be prevented. In addition, by setting the upper limit value of the depression angle to 120 °, there is an effect that the effect of preventing the relative slip between the axial end surface of the inner cylinder of the vibration isolator and the mating member can be prevented. Therefore, it is possible to prevent that hardly separated bites are the projections on the end face in the axial direction of the inner cylinder after about push repressurization step can prevent relative slippage between the axial end surface and the mating member of the inner cylinder of the vibration damping device effective.

According to the vibration isolator manufacturing method of the second aspect, the protrusions are arranged in a lattice pattern on the end face of the pressing tool, and have a flat surface on at least a part of the slope extending from the end face of the pressing tool. Such protrusions can be formed relatively easily using an NC machine tool or the like. As a result, in addition to the effect of the first aspect , there is an effect that the workability of creating a protrusion for forming a recess can be improved.
According to the vibration isolator manufacturing method of the third aspect, the curvature radius of the tip of the protrusion is set to 0.3 mm or more. Thereby, in addition to the effect of Claim 1 or 2, there exists an effect which can make it difficult to produce the malfunction which a protrusion protrudes into the axial end surface of an inner cylinder after a press process, and becomes difficult to leave | separate.

It is sectional drawing of the vibration isolator which shows the state which assembled and fixed the vibration isolator in 1st Embodiment of this invention to the other member. It is sectional drawing of the axial direction of the vibration isolator in which the roughening process of the end surface of an inner cylinder is performed. (A) is a front view of the pressing tool viewed from the axial direction, (b) is a partial enlarged view of an end surface in the axial direction of the pressing tool, and (c) is taken along arrows IIIc-IIIc in FIG. 3 (b). It is sectional drawing of a pressing tool. (A) is a front view of the vibration isolator as viewed from the axial direction, (b) is a partially enlarged view of the end surface of the inner cylinder in the axial direction, and (c) is an arrow IVc-IVc in FIG. 4 (b). It is sectional drawing of the inner cylinder in. (A) is the front view which looked at the roughening pressing tool of the vibration isolator in 2nd Embodiment from the axial direction, (b) is the elements on larger scale of the end surface of the axial direction of a pressing tool, (C) is sectional drawing of the pressing tool in the arrow Vc-Vc of FIG.5 (b). (A) is the front view which looked at the pressing tool for roughening of the vibration isolator in 3rd Embodiment from the axial direction, (b) is the elements on larger scale of the end surface of the axial direction of a pressing tool, (C) is sectional drawing of the pressing tool in arrow VIc-VIc of FIG.6 (b). (A) is the front view which looked at the roughening pressing tool of the vibration isolator in 4th Embodiment from the axial direction, (b) is a pressing tool in arrow VIIb-VIIb of FIG. 7 (a). It is sectional drawing. (A) is the front view which looked at the pressing tool for roughening of the vibration isolator in a comparative example from the axial direction, (b) is the elements on larger scale of the end surface of the axial direction of a pressing tool, (c) These are sectional drawings of the pressing tool in the arrow VIIIc-VIIIc of FIG.8 (b).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the vibration isolator 1 showing a state in which the vibration isolator 1 according to the first embodiment of the present invention is assembled and fixed to a counterpart member (body frame 102). As shown in FIG. 1, a vibration isolator 1 (vibration isolation rubber bush) is formed in a cylindrical inner metal tube 2 formed in a cylindrical shape and in a cylindrical shape concentrically disposed on the outer peripheral side of the inner tube 2. The metallic outer cylinder 3, the inner cylinder 2 and the outer cylinder 3, vulcanized and bonded, interposed between the inner cylinder 2 and the outer cylinder 3, and made of a rubber-like elastic body 4. In the present embodiment, in the vibration isolator 1, the outer cylinder 3 is press-fitted into the mounting hole 101 provided in the front member 100 of the suspension device of the automobile. A shaft body 5 (bolt) of the fastening device is inserted into an insertion hole 2 b formed in the axial direction of the inner cylinder 2 and fastened and fixed by a nut 6. As a result, the vibration isolator 1 is assembled and fixed so that the end surface 2a of the inner cylinder 2 is in pressure contact with the lower surface of the body frame 102 (the mating member) above the front member 100.

  The vibration isolator 1 that is assembled and fixed as described above reduces the displacement input to the vehicle body and attenuates the vibration. However, if the end surface 2a of the inner cylinder 2 causes a relative slip with respect to the vehicle body frame 102 due to vibration while the automobile is running, a sliding noise is generated or the vibration damping effect becomes insufficient. Therefore, the end surface 2a in the axial direction of the inner cylinder 2 is roughened so that the end surface 2a of the inner cylinder 2 is less likely to slide with respect to the body frame 102.

  Next, with reference to FIG. 2, the roughening process performed to the end surface 2a of the inner cylinder 2 is demonstrated. FIG. 2 is a cross-sectional view in the axial direction of the vibration isolator 1 where the end surface 2a of the inner cylinder 2 is roughened. As shown in FIG. 2, the roughening of the end surface 2 a of the inner cylinder 2 is performed by the pressing tools 10 and 20 on the vibration isolator 1 in which the inner cylinder 2 and the outer cylinder 3 are connected by the vibration isolating base 4. . As for the pressing tools 10 and 20, the protrusion parts 11 and 21 are each protrudingly provided in the center of the end surfaces 12 and 22 (top | upper surface) of the member formed in the substantially cylindrical shape. The protrusions 11 and 21 are formed in a columnar shape, and the outer diameter of the protrusions 11 and 21 is set to a value slightly smaller than the inner diameter of the insertion hole 2 b of the inner cylinder 2 of the vibration isolator 1.

  In the roughing process, the pressing tool 10 is fixed to the lower table (not shown) of the hydraulic press, while the pressing tool 20 is fixed to the upper table (not shown). First, the protruding portion 11 of the pressing tool 10 is prevented. It inserts in the axial direction one end side of the inner cylinder 2 of the vibration apparatus 1, and fixes the vibration isolator 1 to a lower table (facing process). Next, the lower table and the upper table of the hydraulic press are relatively moved in the axial direction, and the pressing tools 10, 20 are inserted while the protruding portion 21 of the pressing tool 20 is inserted into the other axial end side of the inner cylinder 2 of the vibration isolator 1. The inner cylinder 2 is clamped in the axial direction by the end faces 12 and 22 (pressing step). As a result, the end surface 22 of the pressing tool 20 is pressed against the end surface 2 a of the inner cylinder 2.

  Next, the pressing tool 20 will be described with reference to FIG. 3A is a front view seen from the axial direction of the pressing tool 20 used for roughing, and FIG. 3B is a partially enlarged view of the end face 22 of the pressing tool 20 in the axial direction. (C) is sectional drawing of the pressing tool 20 in arrow IIIc-IIIc of FIG.3 (b). As shown in FIGS. 3A and 3B, the pressing tool 20 has a plurality of protrusions 23 erected on the end surface 22.

  In the present embodiment, the protrusions 23 are formed in a regular quadrangular pyramid shape, and are regularly arranged in a grid pattern on the end face 22 with an equal interval therebetween. Each protrusion 23 has four inclined surfaces 23b formed in an isosceles triangle shape, and the adjacent inclined surfaces 23b intersect at an oblique ridge 23c that obliquely intersects the end surface 22. The tip 23a where the four oblique ridges 23c intersect is rounded. As shown in FIGS. 3B and 3C, the included angle θ at the cut surface passing through the tip 23a of the protrusion 23 and orthogonal to the end surface 22 coincides with the facing angle of the inclined surface 23b. The depression angle θ is set to 90 ° to 120 °, preferably 95 ° to 100 °.

  Next, with reference to FIG. 4, the vibration isolator 1 subjected to roughening will be described. 4A is a front view of the vibration isolator as viewed from the axial direction, FIG. 4B is a partially enlarged view of the end surface 2a in the axial direction of the inner cylinder 2, and FIG. 4C is FIG. It is sectional drawing of the inner cylinder 2 in arrow IVc-IVc of (b). In the vibration isolator 1 shown in FIG. 4A, the end surface 22 of the inner cylinder 2 is plastically deformed by the pressing load of the protrusion 23 when the end surface 22 of the pressing tool 20 is pressed against the end surface 2 a of the inner cylinder 2. . Thereby, as shown in FIG.4 (b) and FIG.4 (c), the some dent 7 is formed in the end surface 2a.

  In the present embodiment, the recesses 7 are formed in an inverted regular quadrangular pyramid shape, and are regularly arranged in a grid pattern on the end surface 2a with a predetermined interval. Each recess 7 has four inclined surfaces 7b formed in an isosceles triangle shape, and the adjacent inclined surfaces 7b intersect at an oblique ridge 7c that obliquely intersects the end surface 2a. The bottom surface 7a where the four oblique ridges 7c intersect is a curved surface smoothly connected to the inclined surface 7b. The depression angle θ of the recess 7 in the cut surface passing through the deepest portion of the recess 7 (the deepest portion of the bottom surface 7a) and orthogonal to the end surface 2a coincides with the facing angle of the inclined surface 7b. The depression angle θ is set to 90 ° to 120 °, preferably 95 ° to 100 °.

  The dent 7 is generated by the indentation load of the protrusion 23. However, when the protrusion 23 is unloaded, the dent 7 (particularly the bottom surface 7a) is slightly restored to generate a reaction force. If the anti-vibration device 1 bites into the protrusion 23 of the pressing tool 20 and becomes difficult to come off due to the reaction force, an additional work of separating the anti-vibration device 1 and the pressing tool 20 is required. If it does so, the work efficiency of roughing will fall by the amount of the additional work.

  On the other hand, according to the present embodiment, since the protrusion 23 is rounded at the tip 23a, compared to the case where the tip 23a of the protrusion 23 is formed in a conical shape (not rounded). The curvature of the bottom surface 7a of the recess 7 can be reduced. The smaller the curvature of the bottom surface 7 a of the recess 7, the smaller the axial component of the frictional force acting between the bottom surface 7 a of the recess 7 and the protrusion 23 due to the reaction force of the recess 7. Accordingly, it is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 during roughing and becoming difficult to separate due to frictional force. As a result, it is possible to prevent the roughing work efficiency from being lowered.

  Further, since the bottom surface 7a of the recess 7 is a curved surface connected to the slope 7b extending from the axial end surface 2a of the inner cylinder 2, the bottom surface 7a of the recess 7 is compared with the case where the bottom of the recess 7 is not rounded. The curvature can be reduced. Therefore, as described above, it is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 during roughing and becoming difficult to be separated by frictional force. As a result, it is possible to prevent the roughing work efficiency from being lowered.

  In addition, the curvature radius of the front-end | tip 23a of the protrusion 23 is set to 0.3 mm or more, and the curvature radius of the bottom face 7a of the dent 7 formed when the protrusion 23 is pushed in is also set to 0.3 mm or more. By setting the curvature radius of the tip 23a of the projection 23 and the curvature radius of the bottom surface 7a of the recess 7 to be 0.3 mm or more, the projection 23 bites into the axial end surface 2a of the inner cylinder 2 during roughing. It is possible to make it difficult to cause a problem that makes it difficult to leave. On the other hand, as the radius of curvature of the tip 23a of the protrusion 23 and the radius of curvature of the bottom surface 7a of the recess 7 become smaller than 0.3 mm, depending on the depression angle θ, There is a tendency that a problem that the protrusion 23 bites into the end face 2a in the direction and becomes difficult to be separated easily occurs.

  The inner cylinder 2 passes through the deepest part of the recess 7 and has a depression angle θ of 90 ° to 120 °, preferably 95 ° to a cut surface (see FIG. 4C) orthogonal to the axial end surface 2a of the inner cylinder 2. Set to 100 °. By setting the lower limit value of the depression angle θ to 90 °, the projection 23 is difficult to separate from the inner cylinder 2 due to the axial component of the frictional force acting between the recess 7 and the projection 23 during roughing. Can be prevented. Further, by setting the upper limit value of the depression angle θ to 120 °, the effect of preventing relative slip between the axial end surface 2a of the inner cylinder 2 of the vibration isolator 1 and the mating member (body frame 102) is prevented. it can.

  In particular, by setting the depression angle θ to 95 ° to 100 °, it is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 during roughing and making it difficult to separate. The effect of preventing relative slip between the axial end surface 2a and the counterpart member (body frame 102) can be improved. Therefore, by setting the depression angle θ to 90 ° to 120 °, preferably 95 ° to 100 °, the protrusion 23 bites into the end surface 2a in the axial direction of the inner cylinder 2 during the roughing process so that it is difficult to separate. It is possible to achieve both prevention and relative sliding between the axial end surface 2a of the inner cylinder 2 and the mating member (body frame 102).

  The recesses 7 are arranged in a lattice pattern on the end surface 2 a of the inner cylinder 2, and the inclined surface 7 b extending from the end surface 2 a in the axial direction of the inner cylinder 2 has a flat surface at least partially. Specifically, each of the recesses 7 is formed in an inverted regular quadrangular pyramid shape, and the end surface 2a side of each inclined surface 7b is a flat surface, and the bottom surface 7a side is a curved surface. Thereby, the protrusions 23 of the pressing tool 20 for providing the recesses 7 (indentations) are arranged in a lattice shape, and a flat surface is formed on at least a part of the slope 23 b of the protrusions 23.

  Specifically, each of the protrusions 23 is formed in a regular quadrangular pyramid shape, the end surface side of each inclined surface 23b is a flat surface, and the tip 23a side is a curved surface. Since the protrusions 23 are regularly arranged in a grid pattern in the vertical and horizontal directions and formed by the four inclined surfaces 23b, a cutting tool (not shown) is linearly moved in the vertical and horizontal directions using an NC machine tool or the like. It can be formed relatively easily. Therefore, the pressing tool 20 can be formed at low cost. As a result, the protrusion 23 can be easily formed and the pressing tool 20 can be manufactured at a low cost.

  Further, the protrusions 23 can be arranged on the end surface 22 with a high density by regularly providing the protrusions 23 on the end surface 22 of the pressing tool 20 in a grid pattern. As a result, the surface roughness (specified in JIS B0601 and JIS B0031) of the end surface 2a of the inner cylinder 2 where the pressing tool 20 is pressed to form the recess 7 is determined at the sampling portion of the reference length for measurement. Regardless of the position, it can be set without variation.

  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where the protrusions 23 of the pressing tool 20 are arranged in a lattice shape and each of the protrusions 23 is formed in a regular quadrangular pyramid shape has been described. On the other hand, 2nd Embodiment demonstrates the case where the protrusion 33 of the pressing tool 30 is arranged in a grid | lattice form, and each of the protrusion 33 is formed in a cone shape. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

  FIG. 5A is a front view of the roughening pressing tool 30 of the vibration isolator according to the second embodiment viewed from the axial direction, and FIG. 5B is an axial end face 32 of the pressing tool 30. FIG. 5C is a cross-sectional view of the pressing tool 30 taken along arrow Vc-Vc in FIG.

  As shown in FIG. 5A and FIG. 5B, the pressing tool 30 is provided with a protruding portion 31 formed in a columnar shape substantially at the center of the end surface 32, and a plurality of protrusions 33 stand on the end surface 32. It is installed. The protrusions 33 are formed in a conical shape, and are regularly arranged in a grid pattern on the end surface 32 with a predetermined interval. The tip 33a of the protrusion 33 is rounded. As shown in FIG. 5C, the depression angle θ at the cut surface passing through the tip 33a of the protrusion 33 and orthogonal to the end surface 32 is set to 90 ° to 120 °, preferably 95 ° to 100 °. According to 2nd Embodiment comprised as mentioned above, the effect similar to 1st Embodiment is realizable by pressing the press tool 30 to the end surface 2a of the inner cylinder 2. FIG.

  Next, a third embodiment will be described with reference to FIG. 1st Embodiment and 2nd Embodiment demonstrated the case where the protrusions 23 and 33 of the pressing tools 20 and 30 were arranged in a grid | lattice form. On the other hand, 3rd Embodiment demonstrates the case where the protrusion 43 of the pressing tool 40 is arranged radially centering on the protrusion part 41. FIG. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

  FIG. 6A is a front view of the roughening pressing tool 40 of the vibration isolator according to the third embodiment viewed from the axial direction, and FIG. 6B is an axial end face 42 of the pressing tool 40. 6 (c) is a cross-sectional view of the pressing tool 40 taken along arrows VIc-VIc in FIG. 6 (b).

  As shown in FIG. 6A, the pressing tool 40 has a projecting portion 41 formed in a columnar shape substantially at the center of the end surface 42, and a plurality of protrusions 43 are erected on the end surface 42. The protrusions 43 are arranged radially about the protrusion 41. As shown in FIG. 6 (b), the protrusions 43 are formed in a regular quadrangular pyramid shape, and are arranged radially around the protrusions 41 at predetermined intervals in the radial direction of the end face 42 with the protrusions 41 as the center. Is done. Each protrusion 43 has four inclined surfaces 43b formed in an isosceles triangle shape, and the adjacent inclined surfaces 43b intersect at an oblique ridge 43c that obliquely intersects the end surface. The tip 43a where the four oblique ridges 43c intersect is rounded.

  As shown in FIG. 6C, the depression angle θ at the cut surface passing through the tip 43a of the protrusion 43 and orthogonal to the end surface 42 coincides with the facing angle of the inclined surface 43b. The depression angle θ is set to 90 ° to 120 °, preferably 95 ° to 100 °. According to 3rd Embodiment comprised as mentioned above, the effect similar to 1st Embodiment is realizable by pressing the press tool 40 to the end surface 2a of the inner cylinder 2. FIG. Moreover, the dent 7 formed in the end surface 2a of the inner cylinder 2 pressed by the pressing tool 40 can be set so that the pitch in the circumferential direction gradually increases from the radially inner side toward the radially outer side.

  Next, a fourth embodiment will be described with reference to FIG. In the third embodiment, the case where the protrusions 43 of the pressing tool 40 are arranged radially and each of the protrusions 43 is formed in a regular quadrangular pyramid shape has been described. On the other hand, in 4th Embodiment, while the protrusion 53 of the pressing tool 50 is arranged radially centering on the protrusion part 51, the case where each of the protrusion 53 is formed in fan shape in front view is demonstrated. To do. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 7 (a) is a front view of the roughening pressing tool 50 of the vibration isolator according to the fourth embodiment as viewed from the axial direction, and FIG. 7 (b) is an arrow VIIb− in FIG. 7 (a). It is sectional drawing of the pressing tool 50 in VIIb.

  As shown in FIG. 7A, the pressing tool 50 has a protruding portion 51 formed in a columnar shape substantially at the center of the end surface 52, and a plurality of protrusions 53 are erected on the end surface 52. The protrusions 53 are arranged radially around the protrusion 51. The protrusions 53 are formed in a fan shape when viewed from the front, and are arranged radially around the protrusions 51 at predetermined intervals in the radial direction of the end face 52 with the protrusions 51 as the center. The protrusion 53 is formed so as to become longer in the circumferential direction as the protrusion 53 is separated from the protrusion 51 in the radial direction.

  As shown in FIG. 7B, the tip 53a of the protrusion 53 is rounded, and the depression angle θ by the inclined surface 53b in the cut surface passing through the tip 53a of the protrusion 53 and orthogonal to the end surface 52 is 90 ° to 120 °. Preferably, it is set to 95 ° to 100 °. According to 4th Embodiment comprised as mentioned above, the effect similar to 1st Embodiment is realizable by pressing the press tool 50 to the end surface 2a of the inner cylinder 2. FIG. Moreover, the dent 7 formed in the end surface 2a of the inner cylinder 2 to which the pressing tool 50 is pressed can be set such that the length in the circumferential direction gradually increases from the radially inner side toward the radially outer side.

  Hereinafter, the present invention will be described specifically by way of examples. The present invention is not limited to these examples.

Example 1
The vibration isolator 1 was created using the pressing tool 20 (made of alloy tool steel) described in the first embodiment. In the pressing tool 20, the shape of the protrusion 23 was a regular square pyramid, and the tip 23a of the protrusion 23 was rounded. Specifically, the radius of curvature of the tip 23a of the protrusion 23 was 0.3 mm, and the depression angle θ was 90 °. The vibration isolator in Example 1 was obtained by pressing the pressing tool 20 against the end face 2a in the axial direction of the metal inner cylinder 2.

(Example 2)
A vibration isolator in Example 2 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was set to 95 °.

(Example 3)
A vibration isolator in Example 3 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was set to 100 °.

Example 4
A vibration isolator in Example 4 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was 110 °.

(Example 5)
A vibration isolator in Example 5 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was set to 120 °.

(Comparative Example 1)
A pressing tool 60 for roughing a vibration isolator in Comparative Example 1 will be described with reference to FIG. FIG. 8A is a front view of the roughening pressing tool 60 of the vibration isolator in Comparative Example 1 viewed from the axial direction, and FIG. 8B is a partial enlarged view of the axial end surface of the pressing tool 60. FIG. 8C is a cross-sectional view of the pressing tool 60 taken along arrows VIIIc-VIIIc in FIG. 8B.

  The pressing tool 60 has a protruding portion 61 formed in a columnar shape at the approximate center of the end surface 62, and a plurality of protrusions 63 are erected on the end surface 62. The protrusions 63 are arranged in a lattice shape, and as shown in FIG. 8B, each protrusion 63 is formed in a regular quadrangular pyramid shape. The protrusion 63 has four inclined surfaces 63 b formed in an isosceles triangle shape, and the adjacent inclined surfaces 63 b intersect with an oblique ridge 63 c that obliquely intersects the end surface 62. The tip 63a where the four oblique ridges 63c intersect at one point is formed in a weight shape (the radius of curvature is about 0.1 mm). As shown in FIG. 8C, the depression angle θ at the cut surface passing through the tip 63a of the protrusion 63 and orthogonal to the end surface 62 is set to 60 °. By pressing the pressing tool 60 against the axial end surface 2 a of the inner cylinder 2, the vibration isolator in Comparative Example 1 was obtained.

(Comparative Example 2)
A vibration isolator in Comparative Example 2 was obtained in the same manner as in Comparative Example 1 except that the depression angle θ of the protrusion 63 formed on the pressing tool 60 was set to 130 °.

(Results and evaluation)
In the vibration isolator in the second to fifth embodiments, the protrusion 23 of the pressing tool 20 does not bite into the end surface 2a of the inner cylinder 2 during roughing, and the vibration isolating apparatus is removed from the pressing tool 20 during unloading. It was not difficult to come off. In the vibration isolator in the first embodiment, the protrusion 23 of the pressing tool 20 bites into the end surface 2a of the inner cylinder 2 during roughing, and the vibration isolating apparatus is unlikely to come off the pressing tool 60 during unloading. It was rare.

  On the other hand, in the vibration isolator in Comparative Example 1, the protrusion 63 of the pressing tool 60 bites into the end surface 2a of the inner cylinder 2 during the roughing process, and the vibration isolating apparatus comes off the pressing tool 60 during unloading. It was often difficult. As a result, the working efficiency of the roughing process of the end surface of the inner cylinder was lowered.

  Moreover, in the vibration isolator in the comparative example 2, the protrusion 63 of the pressing tool 60 did not bite into the end surface 2a of the inner cylinder 2 at the time of roughing, but the vibration isolator was used as a counterpart member. When assembled, relative sliding between the end surface of the inner cylinder and the mating member may occur.

  From the above, by rounding the tip of the protrusion 23 of the pressing tool 20 and setting the depression angle θ in the cutting plane passing through the tip 23a of the protrusion 23 and orthogonal to the end surface 22 to 90 ° to 120 °, It is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 after the pressing step and making it difficult to separate, and the relative slip between the axial end surface 2a of the inner cylinder 2 of the vibration isolator 1 and the counterpart member. It became clear that this can be prevented. In particular, it has been clarified that by setting the depression angle θ of the protrusion 23 to 95 ° to 100 °, it is possible to reliably prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 and becoming difficult to separate.

  In addition, although description is abbreviate | omitted, also when using the pressing tool 30,40,50 for the roughening process of the vibration isolator in 2nd Embodiment-4th Embodiment, it is the same tendency as a present Example. It was confirmed that was seen.

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

  Although each said embodiment demonstrated the case where roughening was given to the end surface 2a of the one side of the axial direction of the inner cylinder 2 of the vibration isolator 1 by the pressing tools 20, 30, 40, 50, it does not necessarily restrict to this. It is not a thing. In accordance with the manner in which the vibration isolator 1 is assembled to the mating member, not only one end surface 2a in the axial direction of the inner cylinder 2 but also both end surfaces in the axial direction of the inner cylinder 2 are roughened. Of course it is possible to do.

  In each of the embodiments described above, the vibration isolator 1 that is mounted on the front member 100 of the suspension device of the automobile has been described. However, the present invention is not limited to this, and members other than the front member, automobile parts other than the member, Needless to say, the present invention can be applied to a vibration isolator that is mounted on an automobile part other than the suspension device.

  In each of the above-described embodiments, the case where the vibration isolator 1 is mounted on the vehicle body so that the axis is in the vertical direction is described. However, the present invention is not limited to this, and the axis is along the front-rear direction. Of course, it is possible to mount the vibration isolator 1 so as to be in the posture or the posture along the left-right direction.

  In each of the above-described embodiments, the pressing tool 20, 30, 40, 50 has been described with respect to the case where the protruding portions 21, 31, 41, 51 are provided at the center. However, the present invention is not necessarily limited to this, and the protruding portions 21, 31, 41 and 51 are not necessarily required. Even if the protrusions 21, 31, 41, 51 are not provided, the pressing members 23, 33, 43, 53 are pressed on the end surface 2a of the inner cylinder 2 by pressing the pressing tool formed on the end surface in the axial direction. This is because the depression 7 (indentation) can be formed in the end surface 2 a of the inner cylinder 2 by the pushing load of the protrusion 23.

  In each of the above embodiments, the heights of the protrusions 23, 33, 43, 53 provided on the pressing tools 20, 30, 40, 50 (the end surfaces 22, 32, 42, 52 and the protrusions 23, 33, 43, A case has been described in which the distances 53 of the distal ends 23a, 33a, 43a, 53a of the 53 are set to be substantially the same over the entire end faces 22, 32, 42, 52. However, it is not necessarily limited to this, and the heights of the protrusions 23, 33, 43, 53 can be set arbitrarily. Moreover, it is also possible to make the pitch of the protrusions 23, 33, 43, 53 provided on the pressing tools 20, 30, 40, 50 partially different.

  For example, the height of the protrusions 23, 33, 43, 53 pushed into the radially outer side of the end surface 2 a of the inner cylinder 2 is the height of the protrusion 23, 33, 43, 53 pushed into the radially inner side of the end surface 2 a. Of course, it is possible to set the value so as to be lower. Thereby, since the pushing load inside the end surface 2a of the inner cylinder 2 in the radial direction can be increased, it is possible to prevent the load for pressing the inner cylinder 2 in the axial direction from being increased more than necessary. As a result, the inner cylinder 2 can be prevented from buckling during roughing.

1 anti-vibration device 2 inner cylinder 2a end face 3 the outer tube 4 explosion foot member 20, 30, 40, 50 pressing tool 22, 32, 42, 52 end surface 23,33,43,53 protrusion 23a, 33a, 43a, 53a Tip 23b Slope 102 Body frame (mating member)
θ

Claims (3)

An outer cylinder, an inner cylinder disposed on the inner peripheral side of the outer cylinder, and an antivibration base interposed between the inner cylinder and the outer cylinder and configured by a rubber-like elastic body. In the manufacturing method of the vibration isolator in which the mating member is pressed against the axial end surface of the inner cylinder,
A facing step of facing a pressing tool having a plurality of raised protrusions with rounded ends on the end surface facing the end surface in the axial direction of the inner cylinder;
A pressing step of relatively moving the inner cylinder and the pressing tool in the axial direction to press the end face of the pressing tool to the end face of the inner cylinder to form the protruding indentations on the end face of the inner cylinder ;
The method of manufacturing a vibration isolator, wherein the pressing tool has a depression angle of 95 ° to 120 ° at a cutting plane that passes through the tip of the protrusion and is orthogonal to the end surface . The protrusion is formed in a lattice pattern on the end surface of the pressing member, the vibration isolating apparatus according to claim 1, characterized in that it has at least a portion in the plane of the inclined surface extending from the end surface of the pressing tool Production method. The method of manufacturing a vibration isolator according to claim 1 or 2, wherein a radius of curvature of the tip of the protrusion is set to 0.3 mm or more.

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