JP2012180873A - Strut mount and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strut mount capable of preventing a damping base from coming off from a case member, and preventing idle rotation of an inner member in the case member during fastening of a piston rod, and to provide a method of manufacturing the strut mount.SOLUTION: When a body part 21 of a damping base 20 is fitted into a cylindrical wall 31 of a case member 30, a lower wall 32 is held between the body part 21 and a stopper part 22. Accordingly, the damping base 20 is prevented from coming off from the cylindrical wall 31 of the case member 30 during conveyance until a strut mount single body is assembled to a vehicle body. When the piston rod is fastened and fixed to an inner member 10, the idle rotation of the damping base 20 relative to the case member 30 is prevented by the engagement of an outer circumferential shape of a connection 23 with an inner circumferential shape of an insertion through-hole 32a. As a result, the workability of the fastening work is improved.

Description

  The present invention relates to a strut mount and a method for manufacturing the strut mount, and in particular, it is possible to prevent the vibration-proof base from dropping from the case member and to prevent the inner member from idling in the case member when the piston rod is fastened and fixed. The present invention relates to a strut mount and a method for manufacturing the strut mount.

  In a suspension system for an automobile, transmission of vibration from the wheel side to the vehicle body side is suppressed by interposing a strut mount between the vehicle body and the piston rod of the shock absorber. For example, as disclosed in Patent Document 1, the strut mount includes an inner ring 2 (inner member) to which an upper end portion of a piston rod 4 of a shock absorber 5 is fastened and fixed, and an outer ring 6 surrounding the inner ring 2. The outer ring 6 is press-fitted into a cylindrical portion A of a flange member 19 (case member) attached to the vehicle body 3 (vehicle body). .

  In this way, in the configuration in which the inner ring 2 and the outer ring 6 are connected by the elastic body 8, after the vulcanization molding of the elastic body 8, the outer ring 6 is drawn to reduce the diameter. Is called. Thereby, the internal stress which generate | occur | produces by the thermal contraction of the elastic body 8 can be reduced, and durability can be improved.

JP 2001-82530 A (FIG. 1, paragraphs 0014, 0018, etc.)

  Here, like the conventional strut mount described above, the inner ring 2 (inner member) and the outer ring 6 are connected by the elastic body 8 and the outer ring 6 is press-fitted into the flange member 19 (case member). In the configuration, not only the drawing of the outer ring 6 is required, but also the dimensional inspection after the drawing is indispensable, which increases the man-hours and the product cost.

  For this reason, it is desirable that the strut mount can be configured without using the outer ring 6, but simply omitting the outer ring 6 has the following problems. That is, in the case of a structure in which one side of the flange member 19 (case member) is opened and the one side is sealed by a member on the vehicle body 3 (vehicle body) side as in the conventional strut mount described above. It is necessary to prevent the elastic body 8 from falling out of the flange member 19 in a transport process until the strut mount is assembled to the vehicle body.

  However, in this case, even if the elastic body 8 is press-fitted into the flange member 19, a sufficient press-fitting strength cannot be ensured only by the elastic force of the elastic body 8, so that it is difficult to reliably prevent the drop-out. There is. Similarly, since sufficient press-fit strength cannot be secured, when the upper end portion of the piston rod 4 is fastened and fixed to the inner ring 2 (inner member), the inner ring 2 and the elastic body 8 are caused by the fastening torque. There was a problem that the flange member 19 was idled and the fastening operation was hindered.

  The present invention has been made in view of the above-described circumstances, and can prevent the vibration-proof base from falling off the case member and prevent the inner member from idling in the case member when the piston rod is fastened and fixed. An object of the present invention is to provide a strut mount and a method for manufacturing the strut mount.

Means for Solving the Problems and Effects of the Invention

  According to the strut mount of the first aspect, the vibration isolating base is formed in an annular shape in which the inner member is vulcanized and bonded to the inner peripheral side, and the main body is fitted into the cylindrical wall portion of the case member, and the main body A stopper portion formed on the opposite side of the case member with the lower wall portion sandwiched therebetween and having an outer diameter larger than the inner diameter of the insertion hole of the lower wall portion, and the stopper portion and the main body And an annular connecting part that connects the stopper part and the main body part through the insertion hole in the lower side wall part, so that the main body part of the vibration isolating base is inserted into the cylindrical wall part of the case member. (In other words, the stopper portion of the vibration isolating base is passed through the insertion hole in the lower wall portion from the cylindrical wall portion side of the case member and is positioned on the lower surface side of the lower wall portion, or is prevented so as to be in that state. The vibration base is vulcanized together with the case member using a vulcanization mold. ), It is possible to sandwiched the lower wall of the case member between the body portion and the stopper portion of the vibration-isolating base.

  As a result, the main body portion of the vibration isolating base fitted inside the cylindrical wall portion of the case member is displaced to one side in the axial direction (opening side on the fastening wall portion side). It can regulate by engaging the stopper part. As a result, there is an effect that it is possible to prevent the vibration-proof base (main body part) from falling off the case member (cylinder wall part).

  Thus, according to the first aspect, the outer ring (hereinafter referred to as “outer cylinder fitting”) required in the conventional product can be omitted. Therefore, according to the first aspect, it is not necessary to perform drawing processing on the outer tube metal fitting, and as a result, dimensional inspection after drawing processing is not required, and accordingly, the number of manufacturing steps can be reduced and the product cost can be reduced. There is an effect that can be achieved. Further, since the outer cylindrical fitting can be omitted, there is an effect that not only the cost of the parts accompanying the reduction of the number of parts but also the weight of the product can be reduced.

  In addition, if the outer cylindrical fitting can be omitted in this way, a space for the inner member and the main body portion of the vibration isolating base can be secured in a limited space within the cylindrical wall portion of the case member. Accordingly, the degree of freedom of the shape of the inner member and the main body portion of the vibration-proof base is increased, and there is an effect that the design can be improved and the static and dynamic characteristics and durability can be improved.

  Furthermore, according to the first aspect, there is an effect that the amount of deflection of the vibration-proof base at the time of bounce-side input can be suppressed and durability can be improved. That is, at the time of bound side input, the portion of the vibration isolating base located in the region between the inner member and the vehicle body side member mainly functions (compresses and deforms), but the vibration isolation is applied to the lower side wall portion of the case member. By engaging the stopper portion of the base, the other part of the vibration-proof base (the part located in the region between the inner member and the lower side wall of the case member) can also function (tensile deformation). Therefore, if the input load is the same, the amount of deflection can be suppressed by effectively using the entire vibration-proofing substrate as much as other parts of the vibration-proofing substrate function.

  In addition, as described above, the state where the lower side wall portion of the case member is sandwiched between the main body portion and the stopper portion of the vibration-proof base is placed in a rubber-like mold in the vulcanization mold in which the case member is installed in the cavity. When it is obtained by filling an elastic body and performing vulcanization molding, it is not necessary to apply an adhesive to the case member. Therefore, in this case, there is an effect that it is possible to reduce the material cost and the manufacturing cost without using the adhesive and the coating process.

  According to the strut mount of the second aspect, in addition to the effect produced by the strut mount of the first aspect, the lower side wall portion of the case member has a non-circular cross-sectional shape of the insertion hole in the direction perpendicular to the axis of the cylindrical wall portion. Since the cross-sectional shape of the connecting portion in the direction perpendicular to the axis of the cylindrical wall portion is formed in a non-circular shape similar to the cross-sectional shape of the insertion hole, the anti-vibration base is formed on the cylindrical wall portion of the case member as described above. By fitting the main body portion of the vibration isolating base, the connecting portion of the vibration isolating base and the lower side wall portion (insertion hole) of the case member can be engaged.

  Thus, the displacement (rotation) of the vibration isolating base in the circumferential direction with respect to the case member can be restricted by the engagement between the connection portion of the vibration isolating base and the lower side wall of the case member. As a result, when the piston rod is fastened and fixed to the inner member, the inner member can be prevented from idling in the case member (cylinder wall portion). Therefore, the workability of the fastening work can be improved.

  Further, since the cross-sectional shape of the connecting portion of the vibration isolating base is formed to be similar to the cross-sectional shape of the insertion hole in the lower wall portion of the case member, the connecting portion of the vibration isolating base is partially deformed. It can be made to engage with the insertion hole in the lower side wall part of the case member while suppressing the above. As a result, it is possible to regulate the displacement (rotation) of the vibration isolating substrate in the circumferential direction with respect to the case member while suppressing the burden on the connecting portion of the vibration isolating substrate, thereby improving the durability. There is an effect that can be.

  According to the strut mount of the third aspect, in addition to the effect achieved by the strut mount of the first aspect, the lower side wall portion of the case member is formed to penetrate the lower side wall portion and is distributed around the insertion hole. A plurality of dispersion holes are provided, and the connection portion of the vibration isolating base connects the stopper portion and the main body portion through the insertion hole and the dispersion hole of the lower side wall portion. By engaging with the dispersion hole in the portion, there is an effect that it is possible to more surely regulate the displacement (rotation) of the vibration isolation base body in the circumferential direction with respect to the case member.

  That is, the state in which the main body portion of the vibration isolating base is fitted into the cylindrical wall portion of the case member and the lower wall portion of the case member is sandwiched between the main body portion and the stopper portion of the vibration isolating base as described above. In the case where the case member is obtained by filling a rubber-like elastic body in a vulcanization mold provided in the cavity and vulcanization molding, the connection portion of the vibration isolating base is connected to the lower side wall portion of the case member. While being disposed in the dispersion hole, the main body portion and the stopper portion can be connected via the portion disposed in the dispersion hole. As a result, it is possible to reliably achieve regulation of displacement (rotation) in the circumferential direction with respect to the case member of the vibration-proof base.

  According to the strut mount manufacturing method of claim 4, in the vulcanization molding step, the vibration isolation substrate is vulcanized without applying the adhesive to the case member. There is an effect that the material cost and the manufacturing cost can be reduced as unnecessary.

  In this case, the anti-vibration base vulcanized and formed by the vulcanization step is formed in an annular shape in which the inner member is vulcanized and bonded to the inner peripheral side, and the main body portion fitted into the cylindrical wall portion of the case member, A stopper part that is disposed on the opposite side of the main body part across the lower wall part of the case member and has an outer diameter larger than the inner diameter of the insertion hole of the lower wall part, and these stopper parts, Since it is formed integrally with the main body part and has an annular connecting part that connects the stopper part and the main body part through the insertion hole of the lower side wall part, the lower side wall part of the case member is connected to the main body part of the anti-vibration base. It can be sandwiched between the stopper portion.

  As a result, the main body portion of the vibration isolating base fitted inside the cylindrical wall portion of the case member is displaced to one side in the axial direction (opening side on the fastening wall portion side). It can regulate by engaging the stopper part. As a result, there is an effect that it is possible to prevent the vibration-proof base (main body part) from falling off the case member (cylinder wall part).

  Thus, in claim 4, the outer ring (hereinafter referred to as “outer tube fitting”) required in the conventional product can be omitted. Therefore, according to the fourth aspect, it is not necessary to perform drawing processing on the outer tube metal fitting, and as a result, dimensional inspection after drawing processing is not required, thereby reducing the number of manufacturing steps and reducing the product cost. There is an effect that can be achieved. Further, since the outer cylindrical fitting can be omitted, there is an effect that not only the cost of the parts accompanying the reduction of the number of parts but also the weight of the product can be reduced.

  In addition, if the outer cylindrical fitting can be omitted in this way, a space for the inner member and the main body portion of the vibration isolating base can be secured in a limited space within the cylindrical wall portion of the case member. Accordingly, the degree of freedom of the shape of the inner member and the main body portion of the vibration-proof base is increased, and there is an effect that the design can be improved and the static and dynamic characteristics and durability can be improved.

  Furthermore, according to the fourth aspect, there is an effect that it is possible to improve the durability by suppressing the amount of deflection of the vibration-proof base at the time of bound side input. That is, at the time of bound side input, the portion of the vibration isolating base located in the region between the inner member and the vehicle body side member mainly functions (compresses and deforms), but the vibration isolation is applied to the lower side wall portion of the case member. By engaging the stopper portion of the base, the other part of the vibration-proof base (the part located in the region between the inner member and the lower side wall of the case member) can also function (tensile deformation). Therefore, if the input load is the same, the amount of deflection can be suppressed by effectively using the entire vibration-proofing substrate as much as other parts of the vibration-proofing substrate function.

  In addition, as described above, the state where the lower side wall portion of the case member is sandwiched between the main body portion and the stopper portion of the vibration-proof base is placed in a rubber-like mold in the vulcanization mold in which the case member is installed in the cavity. When it is obtained by filling an elastic body and performing vulcanization molding, it is not necessary to apply an adhesive to the case member. Therefore, in this case, there is an effect that it is possible to reduce the material cost and the manufacturing cost without using the adhesive and the coating process.

It is sectional drawing of the strut mount in 1st Embodiment of this invention. (A) is a top view of a vibration-proof substrate, and (b) is a cross-sectional view of the vibration-proof substrate taken along line IIb-IIb in FIG. 2 (a). (A) is sectional drawing of the anti-vibration base | substrate in the III-III line | wire of FIG.2 (b). (A) is a top view of a case member, (b) is sectional drawing of the case member in the IVb-IVb line | wire of Fig.4 (a). (A) is an exploded sectional view of a strut mount, (b) is an assembly sectional view of a strut mount. (A) is sectional drawing of the vibration proof base in 2nd Embodiment, (b) is a top view of the case member in 2nd Embodiment. It is sectional drawing of the strut mount in 3rd Embodiment. (A) is a top view of a case member, (b) is sectional drawing of the case member in the VIIIb-VIIIb line | wire of Fig.8 (a). It is sectional drawing of the vulcanization metal mold | die which the inner side member and the case member were installed and clamped. It is sectional drawing of the strut mount in 3rd Embodiment. (A) is a top view of the case member in 4th Embodiment, (b) is sectional drawing of the case member in the XIb-XIb line | wire of Fig.11 (a).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the strut mount 1 will be described with reference to FIG. FIG. 1 is a cross-sectional view of the strut mount 1 according to the first embodiment of the present invention, and shows a state where the strut mount 1 is mounted on a vehicle body. In FIG. 1, the piston rod R and the nut N are not shown in cross-section, and the bolts that fasten and fix the case member 30 and the vehicle body panel BP are omitted.

  As shown in FIG. 1, a strut mount 1 is a vibration isolator that supports the tip of a piston rod R of a shock absorber on the vehicle body side, an inner member 10 to which the tip of the piston rod R is fastened and fixed, and its inner member. 10 mainly includes a vibration isolating base 20 to which the inner peripheral side is vulcanized and bonded, and a case member 30 in which a part of the vibration isolating base 20 is fitted and fixed to the vehicle body panel BP. The

  The inner member 10 is formed from a steel material, an aluminum alloy, or the like into a circular disk shape when viewed from above, and an insertion hole 10a for inserting the tip of the piston rod R of the shock absorber is formed at the center thereof. The tip of the rod R is inserted into the insertion hole 10 a and the nut N is fastened, whereby the shock absorber is attached to the inner member 10.

  The anti-vibration base 20 is formed in a cylindrical shape as a whole from a rubber-like elastic body, and the inner member 10 is vulcanized and bonded to the inner peripheral side of the main body portion 21 located on the upper end side in a state where the outer edge portion is embedded. The The anti-vibration base 20 includes a main body portion 21 fitted in the case member 30 (cylinder wall portion 31), a stopper portion 22 disposed on the lower surface side of the case member 30 (lower wall portion 32), and those And a connecting portion 23 that connects the main body portion 21 and the stopper portion 22.

  The case member 30 is formed into a container shape by pressing from a steel material, and includes a cylindrical wall portion 31 and a lower side wall portion 32 that serve as a receiving portion for receiving the main body portion 21 of the vibration isolating base 20, and a vehicle body panel BP. A fastening wall portion 33 serving as an attachment portion is provided. The fastening wall portion 33 is formed with a fastening hole 33a in which a female screw is threaded on the inner peripheral surface. In addition, a part that bulges toward the lower surface side (lower side in FIG. 1) is formed in a part of the fastening wall portion 33, and a fastening hole 33a is formed in the bulged part. Thereby, the fastening possible length of the to-be-fastened hole 33a is ensured.

  A bolt inserted into the insertion hole h of the vehicle body panel BP is fastened to the tightened hole 33a. Thereby, the fastening wall part 33 is joined and fixed to the vehicle body panel BP, and the case member 30 is attached to the vehicle body. When the case member 30 is attached to the vehicle body panel BP, the main body portion 21 of the vibration isolation base 20 is sandwiched (compressed) in the axial direction (up and down direction in FIG. 1) between the case member 30 and the vehicle body panel BP. The

  An opening m is formed in the vehicle body panel BP at a position corresponding to the tip of the piston rod R of the shock absorber, and a work space for fastening the nut N to the tip of the piston rod R through the opening. Is secured.

  Next, with reference to FIGS. 2 and 3, the detailed configuration of the vibration isolation base 20 will be described. FIG. 2A is a top view of the vibration isolation base 20, and FIG. 2B is a cross-sectional view of the vibration isolation base 20 taken along the line IIb-IIb in FIG. 2A. FIG. 3A is a cross-sectional view of the vibration-proof substrate 20 taken along the line III-III in FIG.

  As shown in FIGS. 2 and 3, the anti-vibration base 20 includes a main body portion 21 located on the upper side in the axial direction (upper side in FIG. 2B), a stopper portion 22 located on the lower side in the axial direction, and the main body portions. 21 and a stopper portion 22, and a connecting portion 23 that connects the two, and these portions 21 to 23 are integrally vulcanized to form a cylindrical shape into which the piston rod R can be inserted. .

  The main body 21 is formed in an annular shape (doughnut shape), and the inner member 10 is vulcanized and bonded to a position substantially in the axial direction (vertical direction in FIG. 2B). The upper surface (upper side surface in FIG. 2B) of the main body portion 21 is formed as a plane perpendicular to the axis, and a plurality (six in this embodiment) of recessed portions 25 are recessed on the upper surface. Established. Each hollow part 25 is the same shape, and is arrange | positioned at the circumferential direction equal intervals.

  The outer peripheral surface of the main body 21 has an area Sa positioned on the lower side in the axial direction (lower side in FIG. 2B) formed in parallel with the axis, while the upper surface side of the main body 21 (axial direction) from the area Sa. A region Sb on the upper side is formed to be inclined in the direction of diameter reduction with respect to the axis. The inner member 10 is disposed at an axial position that is a boundary between the region Sa and the region Sb.

  The main body 21 has an outer diameter in the region Sa set to be approximately the same as an inner diameter of the cylindrical wall portion 31 of the case member 30. Further, the height dimension of the main body portion 21 before being fitted into the cylindrical wall portion 31 of the case member 30 (between the lower surface supported by the lower wall portion 32 of the case member 30 and the upper surface facing the lower surface) 2B (vertical dimension in FIG. 2 (b)) is a relationship between the upper surface of the lower wall portion 32 of the case member 30 and the lower surface of the vehicle body panel BP in a state where the fastening wall portion 33 of the case member 30 is fastened and fixed to the vehicle body panel BP. The dimension is set to be larger than the distance between the facing surfaces (the vertical dimension in FIG. 1).

  Therefore, when the strut mount 1 is attached to the vehicle body, the main body portion 21 is pressed (compressed) in the axial direction between the vehicle body panel BP and the lower side wall portion 32 of the case member 30, and the case member 30 The cylindrical wall 31 is pressed (compressed) in the direction of diameter reduction (see FIG. 1).

  The stopper portion 22 is formed in a cylindrical shape and is arranged concentrically with the main body portion 21, and the outer peripheral surface and the inner peripheral surface thereof have a plurality of circumferentially continuous ones (one in the outer peripheral surface in the present embodiment, Two grooves are provided in the inner peripheral surface. In addition, the outer peripheral surface of the stopper portion 22 has a region Sc located on the lower side in the axial direction (lower side in FIG. 2B) formed in parallel with the shaft, while the body portion 21 sandwiches the groove portion from the region Sc. The region Sd located on the side (the upper side in the axial direction) is formed so as to be inclined in the diameter increasing direction with respect to the axis as it goes from the region Sc side to the main body 21 side.

  In addition, the region Se connected to the lower end (the side opposite to the region Sd) of the region Sc is formed so as to be inclined in the diameter-reducing direction with respect to the axis as the distance from the region Sc increases. The outer diameter in a predetermined range on the lower end side of the region Se is set in the hexagonal shape of the insertion hole 32a with respect to the insertion hole 32a (see FIG. 4A) formed in the lower side wall portion 32 of the case member 30. The dimension is set to be smaller than the diameter of the inscribed circle to be in contact. Therefore, when mounting the vibration isolator base 20 on the case member 30 (see FIG. 5), the stopper portion 22 can be easily inserted into the insertion hole 32a, and the mounting work can be made more efficient.

  Here, the stopper portion 22 is a portion that functions as a bound stopper for receiving a shock absorber tube (not shown) at the time of bound side input and restricting the displacement thereof, and the vibration-proof base 20 is attached to the case member 30. In this state, the casing member 30 is disposed on the opposite side of the main body portion 21 with the lower wall portion 32 interposed therebetween (see FIG. 5B).

  That is, the stopper portion 22 has an insertion hole in which the outer diameter (maximum outer diameter) on the main body portion 21 side (the upper side in the axial direction, the upper side in FIG. 2B) in the region Sd is opened in the lower side wall portion 32 of the case member 30. It is made larger than the inner diameter of 32a. Therefore, since the upper surface side of the stopper part 22 is supported by the lower side wall part 32 of the case member 30, it is possible to restrict the displacement of the shock absorber tube while buffering the impact by deformation of the stopper part 22 at the time of bound side input. it can.

  The connecting portion 23 is formed in an annular shape, is disposed concentrically between the lower surface side of the main body portion 21 and the upper surface side of the stopper portion 22, and connects both the portions 21 and 22. The inner peripheral surfaces of the main body 21, the stopper 22, and the connecting member 23 are formed substantially parallel to the shaft (however, having a slight draft considering the demolding property from the vulcanization mold), The inner diameter of the inner peripheral surface is set to be approximately the same as the inner diameter of the main body 21 on the lower side in the axial direction than the inner member 10 and the inner diameter of the stopper 22.

  The thickness of the connecting portion 23 in the axial direction (the vertical direction in FIG. 2B) is set to be substantially the same as or slightly smaller than the plate thickness size (the vertical dimension in FIG. 4) of the lower side wall portion 32 of the case member 30. In addition, the outer diameter is formed to be substantially the same as or slightly smaller than the inner diameter of the insertion hole 32a formed in the lower wall portion 32. Therefore, in a state where the vibration isolating base 20 is attached to the case member 30 (see FIG. 5B), the connecting portion 23 is disposed in the insertion hole 32a, and the main body portion 21 is connected to the insertion portion 32a through the insertion hole 32a. The stopper part 22 is connected.

  Here, as shown in FIG. 3, the connecting portion 23 is formed in a regular hexagonal cross-sectional shape. The cross-sectional shape is the same as or slightly smaller than the cross-sectional shape of the insertion hole 32 a formed in the lower side wall portion 32 of the case member 30. Therefore, when the vibration isolating base 20 is mounted on the case member 30 (see FIG. 5B), the outer peripheral surface of the connecting portion 23 is engaged with the inner peripheral surface of the insertion hole 32a, and the case of the vibration isolating base 20 is obtained. The rotation with respect to the member 30 is restricted.

  Next, the case member 30 will be described with reference to FIG. 4A is a top view of the case member 30, and FIG. 4B is a cross-sectional view of the case member 30 taken along the line IVb-IVb in FIG. 4A.

  As shown in FIG. 4, the case member 30 includes a cylindrical cylindrical wall portion 31 in which the main body portion 21 of the vibration isolation base 20 is fitted (see FIG. 5B), and an axial direction of the cylindrical wall portion 31. (FIG. 4 (b) vertical direction) A lower wall portion 32 extending from the lower end inward in the direction perpendicular to the axis, and a cylindrical wall portion 31 on the opposite side across the lower wall portion 32 and the cylindrical wall portion 31 And a fastening wall portion 33 that extends from the upper end in the axial direction outward in the direction perpendicular to the axial direction and is fastened and fixed to the vehicle body panel BP, and is formed in a deep dish shape as a whole.

  An insertion hole 32a, which is an opening having a regular hexagonal shape when viewed from the front, is formed in the center of the lower wall portion 32, and the piston rod R of the shock absorber can be inserted. The insertion hole 32 a is disposed at a position that is concentric with the cylindrical wall portion 31 (that is, a position at which the center of gravity of the hexagonal shape coincides with the axis of the cylindrical wall portion 31). Further, the upper surface of the lower wall portion 32 is formed as a plane substantially orthogonal to the axis of the cylindrical wall portion 31 and supports the lower surface of the vibration isolating base 20.

  The case member 30 is formed by punching a flat material into a predetermined outer shape, and pressing the punched material. In the step of punching the flat material, the insertion hole 32a is simultaneously formed. It can be formed by punching. That is, it is not necessary to provide a separate process for forming the insertion hole 32a, and the process can be combined with the process of forming the outer shape. Therefore, even when the insertion hole 32a is formed in a complicated shape such as a regular hexagon when viewed from the front as in the present embodiment, the manufacturing cost of the case member 30 can be reduced.

  The fastening wall portion 33 is formed in a substantially triangular shape when viewed from above, and is disposed at a position where the center of gravity of the triangle coincides with the axis of the cylindrical wall portion 31 and radially outward from the outer peripheral surface of the cylindrical wall portion 31. It forms in the shape of an umbrella which inclines and descends as it moves away. Further, the fastening wall 33 is formed with a fastening hole 33a at a position corresponding to each apex of the triangle. That is, the fastening holes 33a are arranged at intervals of 120 degrees in the circumferential direction with the axis of the cylindrical wall portion 31 as the center.

  In addition, the insertion hole 32a of the lower side wall part 32 is formed in a state in which three sides are directed to the fastening hole 33a. That is, the case member 30 has the same shape every 120 degrees around the axis of the cylindrical wall portion 31 in the top view shown in FIG.

  Next, a method for assembling the strut mount 1 and a method for mounting it on the vehicle body will be described with reference to FIG. FIG. 5A is an exploded cross-sectional view of the strut mount 1, and FIG. 5B is an assembled cross-sectional view of the strut mount 1.

  As shown in FIG. 5A, when assembling the strut mount 1, first, the phase of the vibration isolating base 20 with respect to the case member 30 (that is, the hexagonal circumferential position of the insertion hole 32a and the hexagonal shape of the connecting portion 23). And the stopper portion 22 of the vibration isolating base 20 from the opening on the fastening wall portion 33 side of the case member 30 along the axial direction (the vertical direction in FIG. 5A) (the lower surface). 5 (b), the main body portion 21 of the vibration isolating base 20 is connected to the cylindrical wall portion 31 of the case member 30 as shown in FIG. Fit inside.

  Accordingly, the stopper portion 22 is disposed on the lower surface side of the lower wall portion 32, and the connecting portion 23 of the vibration isolation base 20 is disposed in the insertion hole 32a, so that the lower wall portion 32 is the main body portion 21. And the stopper portion 22, and the assembly of the strut mount 1 is completed.

  The lower surface of the inner member 10 is formed as a flat surface perpendicular to the axis, the inner diameter of the inner member 10 (insertion hole 10a) is smaller than the inner diameters of the connecting portion 23 and the stopper portion 22, and the inner member 10 Since the outer diameter is made larger than the inner diameter of the insertion hole 32a, the stopper portion 22 and the connecting portion 23 can be properly pushed into the insertion hole 32a by using the inner member 10, and as a result, the insertion work It is possible to improve the workability in

  As shown in FIG. 5 (b), after the strut mount 1 is assembled, the strut mount 1 is assembled from the assembly process to the vehicle body (for example, a vehicle that manufactures a vehicle from a component manufacturer that manufactures the strut mount 1). To the manufacturer.

  In this conveyance, since the lower wall portion 32 is sandwiched between the main body portion 21 and the stopper portion 22, the main body portion 21 of the vibration isolating base 20 is located on one side in the axial direction from the inside of the cylindrical wall portion 31. Displacement to the opening side on the fastening wall 33 side and the upper side in FIG. 5B can be restricted. As a result, it is possible to prevent the vibration-proof base 20 from dropping from the cylindrical wall portion 31 of the case member 30 during the transport of the strut mount 1.

  In the mounting step, first, the fastening wall portion 33 of the case member 30 is joined to the vehicle body panel BP, and the bolt inserted through the insertion hole h of the vehicle body panel BP is fastened and fixed to the fastening hole 33a of the fastening wall portion 33. Next, the tip of the piston rod R of the shock absorber is passed through the insertion hole 10 a of the inner member 10 through the insertion hole 32 a of the lower wall portion 32, and is fastened and fixed by the nut N. This completes the mounting of the strut mount 1 to the vehicle body (see FIG. 1).

  In this case, the cylinder of the case member 30 is brought into engagement with the coupling portion 23 of the vibration isolating base 20 and the insertion hole 32a of the cylindrical wall portion 31 (the hexagonal internal fitting of the coupling portion 23 to the hexagonal shape of the insertion hole 32a). It is possible to restrict displacement (rotation) of the main body portion 21 of the vibration isolating base body 20 fitted in the wall portion 31 in the circumferential direction. Therefore, when the piston rod R is fastened and fixed to the inner member 10, the inner member 10 can be prevented from idling in the cylindrical wall portion 31 of the case member 30. As a result, workability at the time of fastening the nut N can be improved.

  As described above, the strut mount 1 can omit the outer ring (outer cylinder fitting) required in the conventional product (see FIG. 1). Therefore, it is not necessary to perform drawing processing on the outer cylinder fitting, and as a result, dimensional inspection after drawing processing becomes unnecessary, and accordingly, the number of manufacturing steps can be reduced and the product cost can be reduced. In addition, since the outer cylindrical metal fitting can be omitted, not only the cost of parts accompanying the reduction in the number of parts but also the weight of the product can be reduced.

  In addition, if the outer cylindrical fitting can be omitted in this way, a space for the inner member 10 and the vibration isolation base 20 (main body portion 21) is secured in a limited space in the cylindrical wall portion 31 of the case member 30. Can do. Accordingly, the degree of freedom of the shapes of the inner member 10 and the vibration isolating base body 20 (main body portion 21) is increased, and accordingly, the design properties thereof are improved, and static and dynamic characteristics and durability are improved. be able to.

  Furthermore, according to the strut mount 1, it is possible to suppress the amount of deflection of the main body portion 21 of the vibration isolating base 20 at the time of bound side input, and to improve the durability of the main body portion 21. This point will be described with reference to FIG.

  That is, at the time of bound side input, the inner member 10 relatively moves upward (moves upward in FIG. 1), so that the portion of the main body portion 21 located in the region between the inner member 10 and the vehicle body panel BP is the main part. However, in the conventional product, the portion located in the region closer to the lower wall portion 32 than the inner member 10 is not allowed to function. In the strut mount 1 according to the present embodiment, the stopper portion The upper surface of 22 is locked to the lower surface of the lower wall portion 32, so that the other portion of the main body portion 21 (that is, the portion located in the region closer to the lower wall portion 32 than the inner member 10) The portion in which the displacement is restricted by locking 21 to the lower wall portion 32 can also function (tensile deformation). Therefore, if the input load is the same, the other part of the main body portion 21 functions to effectively use the entire vibration-proof base 20 (main body portion 21) and suppress the amount of deflection in the main body portion 21. Can do.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, although the case where the shape of the connection part 23 and the insertion hole 32a was formed in polygonal shape (specifically hexagonal shape) was demonstrated, the connection part 223 and insertion in 2nd Embodiment were demonstrated. The hole 232a has a shape obtained by cutting a part of a circle. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 6A is a cross-sectional view of the vibration isolation base 220 in the second embodiment, and FIG. 6B is a top view of the case member 230 in the second embodiment. 6A corresponds to a cross-sectional view taken along line III-III in FIG.

  The anti-vibration base 220 in the second embodiment is different from the anti-vibration base 20 in the first embodiment except that the cross-sectional shape of the connecting portion 223 is different from the cross-sectional shape of the connecting portion 23. Are the same. Further, the case member 230 in the second embodiment is different from the case member 30 in the first embodiment in that the shape of the insertion hole 232a viewed in the axial direction (viewed from the top) is different from the shape of the insertion hole 32a viewed in the axial direction. Except for, the other shapes are the same.

  As shown in FIG. 6, the cross-sectional shape of the connecting portion 223 in the second embodiment is a shape obtained by cutting a part of a circular shape with two parallel straight lines (that is, parallel to two locations on the circumference and the same). A shape having two strings of length). In addition, the circular shape of the connection part 223 is concentric with the main-body part 21 and the stopper part 22 (refer FIG. 2). On the other hand, the shape of the insertion hole 232a in the second embodiment viewed in the axial direction (viewed from the top) is formed in the same shape as the cross-sectional shape of the connecting portion 223. In addition, the magnitude | size is the same magnitude | size, or the connection part 223 is formed in the similar shape a little larger than the insertion hole 232a.

  Also in the second embodiment, when the vibration isolation base 220 is mounted on the case member 230 (see FIG. 5B), the outer peripheral surface of the connecting portion 223 is engaged with the inner peripheral surface of the insertion hole 232a. Thereby, rotation with respect to the case member 230 of the anti-vibration base | substrate 220 can be controlled. As a result, it is possible to improve workability when the nut N is fastened to the piston rod R (see FIG. 1).

  Also in the second embodiment, as in the case of the first embodiment, when the case member 230 is formed by press working, the insertion hole 232a is also simultaneously formed in the step of punching the flat plate-like material first. It can be formed by punching. Therefore, even when it is necessary to form the insertion hole 232a in a complicated shape as in the present embodiment, the manufacturing cost of the case member 230 can be reduced.

  Next, a third embodiment will be described with reference to FIGS. In the first embodiment, after the anti-vibration base 20 is vulcanized, the anti-vibration base 20 is attached to the case member 30 (the main body 21 is fitted into the cylindrical wall 31), so that the strut mount 1 is As described above, the strut mount 301 according to the third embodiment vulcanizes the vibration-proof base 220 by filling the rubber-like elastic material into the vulcanization mold in which the case member 330 is installed in the cavity. Manufactured by molding. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 7 is a cross-sectional view of the strut mount 301 according to the third embodiment, and shows a state where the strut mount 301 is attached to the vehicle body. In FIG. 7, the sectional view of the piston rod R and the nut N is omitted, and the illustration of the bolt that fastens and fixes the case member 330 and the vehicle body panel BP is omitted.

  As shown in FIG. 7, in the strut mount 301 according to the third embodiment, the main body portion 321 of the vibration isolation base 220 is fitted into the cylindrical wall portion 31 of the case member 330, and the stopper portion 322 is attached to the case member 330. The lower wall portion 332 is disposed on the lower surface side (the lower side in FIG. 7). On the other hand, a dispersion hole 332b is formed around the insertion hole 332a in the lower side wall portion 332 of the case member 330 in the third embodiment, and the main body portion 321 and the stopper portion 322 of the vibration isolation base 320 are inserted. They are connected by a connecting portion 323 through the holes 332a and the dispersion holes 332b. Thereby, rotation with respect to the case member 330 of the anti-vibration base | substrate 320 can be controlled more reliably.

  Next, a detailed configuration of the case member 330 in the third embodiment will be described with reference to FIG. 8A is a top view of the case member 330, and FIG. 8B is a cross-sectional view of the case member 330 taken along line VIIIb-VIIIb in FIG. 8A.

  As shown in FIG. 8, the case member 330 has a lower wall portion 332 that extends linearly from the lower end in the axial direction (FIG. 8 (b) vertical direction) of the cylindrical wall portion 31 in the direction perpendicular to the axis. An insertion hole 332a that is a circular opening in front view is formed in the center of the lower wall portion 32. A plurality (three in the present embodiment) of dispersion holes 332b are arranged around the insertion hole 332a at equal intervals in the circumferential direction.

  Similar to the insertion hole 332a, the dispersion hole 332b is an opening formed by drilling the lower wall portion 332 in the thickness direction, and the shape of the dispersion hole 332b is viewed in the axial direction shown in FIG. In a top view), an annular shape arranged concentrically with the insertion hole 332a is formed into a curved oval shape formed by dividing the annular shape at three places in the circumferential direction. By forming the dispersion hole 332b in such a shape, the durability of the connecting portion 323 (see FIG. 7) disposed in the dispersion hole 332b is improved while suppressing the strength reduction of the case member 330, It is possible to prevent rotation of the vibration isolation base 320 with respect to the case member 330.

  Here, the insertion hole 332 a is disposed concentrically with the cylindrical wall portion 331. In addition, the center angle of the dispersion hole 332b with the axis of the cylindrical wall portion 331 as the center is approximately 40 degrees in the present embodiment. This central angle is preferably 30 degrees or more and 60 degrees or less. The inner diameter of the insertion hole 332a is preferably 80% or less of the inner diameter of the cylindrical wall portion 331. The support area of the lower side wall part 332 for supporting the main body part 221 and the stopper part 322 is ensured while ensuring the strength of the case member 330, improving the durability of the connecting part 323, and preventing the vibration isolating base body 220 from rotating. This is to ensure.

  In the third embodiment, as in the case of the first embodiment, when the case member 330 is formed by press working, the insertion holes 332a and the dispersion holes are dispersed in the step of punching the flat material first. The holes 332b can also be formed by punching at the same time. Therefore, even when it is necessary to form not only the insertion holes 232a but also a plurality of dispersion holes 332b as in the present embodiment, the manufacturing cost of the case member 330 can be reduced.

  Next, a method for manufacturing the strut mount 301 in the third embodiment will be described with reference to FIGS. FIG. 9 is a cross-sectional view of the vulcanization mold in which the inner member 10 and the case member 330 are installed and clamped, and shows a state before the rubber-like elastic body is injected into the cavity. FIG. 10 is a cross-sectional view of the strut mount 301 in the third embodiment. The cross section shown in FIG. 9 corresponds to the cross section shown in FIG.

  As shown in FIG. 9, the vulcanization mold is a mold for vulcanization molding of the vibration-proof base 320 (see FIG. 10), and an upper mold MD1 that is clamped up and down (vertical direction in FIG. 9) and The anti-vibration base 320 is formed by vulcanizing a rubber-like elastic body that is provided with the lower die MD2 and is filled from a filling hole (not shown) into a cavity formed by clamping.

  That is, in the molding of the vibration-proof base 320 (vulcanization molding process), first, the inner member 10 and the case member 330 are installed on the lower mold MD2 of the vulcanization mold, and then the upper mold MD1 is moved downward to mold the mold. Tighten (installation process). In the present embodiment, the inner member 10 applies an adhesive to a predetermined range (an area embedded in the main body portion 321 of the vibration isolation base 320) (application process), but the adhesive to the case member 330 is applied. Do not apply.

  As a result, a cavity, which is a vulcanization space for vulcanizing the rubber-like elastic body, is formed as shown in FIG. 9, and the rubber-like elastic body is injected into the cavity from an injection hole (not shown). After the rubber-like elastic body is filled in the cavity, the rubber-like elastic body is vulcanized by holding the vulcanization mold under pressure and heating for a predetermined time.

  The shape of the cavity of the vulcanization mold is such that the maximum outer diameter of the stopper portion 322 is larger than the outer diameter size of the stopper portion 22 in the first embodiment with respect to the outer shape of the vibration isolating substrate 20 in the first embodiment. Other than that, the other configurations are the same except that the outer diameter of the lower side wall portion 332 of the stopper portion 322 is large in order to fill the dispersion hole 322b with a rubber-like elastic body. Therefore, the description is omitted.

  As a result, since the vibration-proof base 320 is molded in a state of being integrated with the inner member 10 and the case member 330, the integrated vulcanized molded body is taken out from the vulcanization mold, as shown in FIG. A strut mount 301 can be obtained.

  In this case, according to the manufacturing method in the present embodiment, since the application of the adhesive to the case member 330 is omitted, the material cost can be reduced as much as the adhesive is not required. Since the coating process is unnecessary, the number of work steps can be reduced, and the product cost of the entire strut mount 301 can be reduced.

  As described above, even when the main body portion 321 of the vibration isolation base 320 is integrally vulcanized with the cylindrical wall portion 331 of the case member 330, no adhesive is applied to the case member 330, and the main body portion 321 Since the space between the cylindrical wall portion 331 and the lower wall portion 332 is vulcanized in a non-bonded state, it is possible to avoid the occurrence of internal stress in the main body portion 321 due to shrinkage after vulcanization molding. Therefore, the durability of the main body portion 321 can be improved.

  Further, since the main body portion 321 is set to have a height dimension (the vertical dimension in FIG. 10) with the case member 330 in the same manner as in the first embodiment, The pressure is compressed (compressed) between the BP and the lower side wall portion 332 of the case member 330 in the axial direction, and thereby, the pressure is compressed (compressed) in the reduced diameter direction by the cylindrical wall portion 331 of the case member 330 (see FIG. 7). Therefore, even if the space between the main body part 321 and the cylindrical wall part 331 and the lower wall part 332 is vulcanized in a non-adhered state, the main body part 321 can be compressed and the durability thereof can be improved. .

  As shown in FIG. 10, after manufacturing the strut mount 301, the strut mount 301 is transported from the vulcanization molding process to the mounting process on the vehicle body. In this conveyance, since the lower wall portion 332 is sandwiched between the main body portion 321 and the stopper portion 322, even if the vibration isolation base 320 and the case member 330 are in the non-adhered state, As in the case of the first embodiment, it is possible to prevent the vibration-proof base 20 from dropping from the cylindrical wall portion 31 of the case member 30 during the transport of the strut mount 1.

  Further, according to the strut mount 301, the connection portion 323 of the vibration isolation base 320 is disposed not only in the insertion hole 332a of the lower side wall portion 332 but also in the dispersion hole 332b, and the main body portion 321 and the stopper portion 322 are provided. Since the connection portion 323 is connected through the insertion hole 332a and the dispersion hole 332b, the piston rod R is attached to the inner member 10 with the nut N even when the vibration isolation base 320 and the case member 330 are not bonded. When fastening and fixing, it is possible to more reliably prevent the inner member 10 from idling in the cylindrical wall portion 31 of the case member 330.

  As described above, the strut mount 301 in the third embodiment has the following effects as in the case of the first embodiment. That is, since the outer ring (outer cylinder fitting) required in the conventional product can be omitted (see FIG. 7), the number of manufacturing steps can be reduced, the product cost can be reduced, and the weight of the product can be reduced. Can be achieved. Moreover, the freedom degree of the shape of the inner member 10 and the vibration isolator base 220 (main body part 221) can be increased, and static and dynamic characteristics and durability can be improved. Furthermore, it is possible to suppress the amount of deflection of the main body portion 321 of the vibration isolation base 320 at the time of bound side input, and to improve the durability of the main body portion 321.

  Next, a fourth embodiment will be described with reference to FIG. In 1st Embodiment, although the case member 30 in which the shape of the insertion hole 32a of the lower wall part 32 was formed in polygonal shape (specifically hexagonal shape) was demonstrated, the case member in 4th Embodiment In 430, the shape of the insertion hole 232a is a shape in which a plurality of protrusions are projected from a circular periphery. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 11A is a top view of the case member 430 in the fourth embodiment, and FIG. 11B is a cross-sectional view of the case member 430 along the line XIb-XIb in FIG. 11A.

  The case member 430 according to the fourth embodiment is different from the case member 30 according to the first embodiment in that the shape of the insertion hole 432a in the axial direction (viewed from the top) is different from the shape of the insertion hole 32a in the axial direction. Except for, the other shapes are the same.

  As shown in FIG. 11, the case member 430 of the fourth embodiment has a plurality of insertion holes 232 a that are substantially rectangular in shape when viewed in the axial direction (viewed from the top) from a circular circumference concentric with the cylindrical wall portion 31. In this embodiment, three projections 432b are projected outward in the radial direction. The protrusions 432b have the same shape and are arranged at equal intervals in the circumferential direction.

  As in the case of the first embodiment, the case member 430 in the fourth embodiment is obtained by vulcanizing and molding the vibration-proof base, and then attaching the vibration-proof base to the case member 430 (the main body portion is the cylindrical wall portion). 31) to produce a strut mount, or, as in the case of the third embodiment, a rubber-like elastic material is applied to a vulcanization mold in which a case member 430 is installed in a cavity. The strut mount can also be manufactured by filling and vibration-molding the vibration-proof substrate.

  In the former case, the cross-sectional shape of the connecting portion of the vibration isolating base is set to a similar shape or slightly smaller than the shape of the insertion hole 432a viewed in the axial direction (viewed from the top), and in the latter case, the case member 430 Install in the cavity of the vulcanization mold without applying adhesive. Thereby, the effect similar to the case of 1st Embodiment and 3rd Embodiment can be acquired even if it is a case of the former and the latter.

  In the fourth embodiment, as in the case of the first embodiment, when the case member 430 is formed by press working, the insertion hole 432a is also simultaneously formed in the step of punching the flat plate-like material first. It can be formed by punching. Therefore, even when it is necessary to form the insertion hole 432a in a complicated shape as in the present embodiment, the manufacturing cost of the case member 230 can be reduced.

  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.

  The numerical values given in the above embodiments are merely examples, and other numerical values can naturally be adopted. For example, in the first embodiment, a hexagon is illustrated as an example of the case where the shape of the connecting portion 23 and the insertion hole 32a is configured as a polygonal shape, but the number of vertices may be 5 or less, It may be 7 or more. Moreover, in 2nd Embodiment, although the shape which divides | segments a circle | round | yen by two line segments was illustrated as an example as a shape of the connection part 223 and the insertion hole 232a, the number of the line segments is one. Alternatively, it may be three. The same applies to the number of dispersion holes 332b described in the third embodiment and the number of protrusions 432b described in the fourth embodiment.

  Note that the polygon in the first embodiment does not have to be a regular polygon, and the plurality of line segments in the second embodiment need not have the same length. These can be set as appropriate. The arrangement positions (circumferential intervals, etc.) of the dispersion holes 332b in the third embodiment and the protrusions 432b in the fourth embodiment are also the same.

  When the strut mount is manufactured by the manufacturing method described in the third embodiment, it is naturally possible to use another case member having a shape different from that of the case member 330 described in the third embodiment. Examples of other case members include the case members 30, 230, and 430 described in the first, second, and fourth embodiments. Any case member 30, 230, 430 can prevent the main body 21 from falling off during conveyance and the idling of the main body 21 during piston rod R fastening.

  In the third embodiment, the case where the application of the adhesive to the case member 330 is completely omitted has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to apply the adhesive to a part thereof. It is. For example, an adhesive may be applied only to the inner peripheral surfaces of the insertion hole 332a and the dispersion hole 332b (that is, only the inner peripheral surface is vulcanized and bonded to the vibration-proof base 320 (connecting portion 323)).

1, 201, 301 Strut mount 10 Inner member 20, 220, 320 Anti-vibration base 21, 321 Main body portion 22, 322 Stopper portion 23, 223, 323 Connection portion 30, 230, 330, 430 Case member 31 Cylindrical wall portion 32, 232, 332, 432 Lower side wall portions 32a, 232a, 332a, 432a Insertion hole 332b Dispersion hole 33 Fastening wall portion BP Vehicle body panel (part of vehicle body, vehicle body side member)
MD1 Upper side (part of vulcanization mold)
MD2 Lower side (part of vulcanization mold)
R piston rod

Claims (4)

An inner member to which the upper end portion of the piston rod of the shock absorber is fastened and fixed; a case member that surrounds the outer periphery of the inner member and attached to the vehicle body; and a rubber-like elastic body that is interposed between the inner member and the case member In a strut mount comprising:
The case member includes a cylindrical tube wall portion, a fastening wall portion that extends outward from an axial end of the tube wall portion in a direction perpendicular to the axis and is fastened and fixed to the vehicle body side, and the tube wall portion A lower wall portion extending from the other axial end to the inside in the direction perpendicular to the axis and having an insertion hole through which the piston rod is inserted in the center portion,
The anti-vibration base is formed in an annular shape in which the inner member is vulcanized and bonded to the inner peripheral side, and is fitted into the cylindrical wall portion of the case member, and the fastening wall portion of the case member is fastened to the vehicle body side A main body portion that is clamped in the axial direction of the cylindrical wall portion between the vehicle body side member and the lower wall portion of the case member when fixed, and the lower wall portion of the case member with respect to the main body portion And a stopper portion formed in a cylindrical shape having an outer diameter larger than the inner diameter of the insertion hole of the lower wall portion, and formed integrally with the stopper portion and the main body portion. A strut mount comprising: an annular coupling portion that couples the stopper portion and the main body portion through an insertion hole in the lower side wall portion. The lower side wall portion of the case member is formed in a noncircular cross-sectional shape of the insertion hole in the direction perpendicular to the axis of the cylindrical wall portion,
2. The strut mount according to claim 1, wherein the anti-vibration base is formed in a non-circular shape in which a cross-sectional shape of the connecting portion in a direction perpendicular to the axis of the cylindrical wall portion is similar to a cross-sectional shape of the insertion hole. . The lower wall portion of the case member includes a plurality of dispersion holes that are formed to penetrate the lower wall portion and are distributed around the insertion hole.
2. The strut mount according to claim 1, wherein the connecting portion of the vibration-proof base connects the stopper portion and the main body portion through an insertion hole and a dispersion hole of the lower side wall portion. An inner member to which the upper end portion of the piston rod of the shock absorber is fastened and fixed; a case member that surrounds the outer periphery of the inner member and attached to the vehicle body; and a rubber-like elastic body that is interposed between the inner member and the case member And the case member extends from the one end in the axial direction of the cylindrical wall portion toward the outside in the direction perpendicular to the axial direction. A fastening wall portion to be fastened and fixed, a lower wall portion having an insertion hole extending from the other axial end of the cylindrical wall portion toward the inner side in a direction perpendicular to the axis and through which the piston rod is inserted in the center portion; In a strut mount manufacturing method for manufacturing a strut mount comprising:
An application step of applying an adhesive to the inner member;
An installation step in which the inner member to which the adhesive is applied by the application step and the case member to which the adhesive is not applied are installed in a vulcanization mold and clamped;
A vulcanization molding step of vulcanizing and molding the vibration-proof substrate by filling a rubber-like elastic body into a cavity of a vulcanization mold in which the inner member and the case member are installed by the installation step; With
The anti-vibration substrate vulcanized and formed by the vulcanization step is formed in an annular shape in which the inner member is vulcanized and bonded to the inner peripheral side via the adhesive, and is formed in the cylindrical wall portion of the case member. A body that is fitted and clamped in the axial direction of the cylindrical wall portion between the vehicle body side member and the lower side wall portion of the case member when the fastening wall portion of the case member is fastened and fixed to the vehicle body side And a stopper portion formed in an annular shape having an outer diameter larger than the inner diameter of the insertion hole of the lower wall portion and disposed on the opposite side of the main body portion across the lower wall portion of the case member And an annular connecting part formed integrally with the stopper part and the main body part and connecting the stopper part and the main body part through an insertion hole of the lower side wall part. Manufacturing method.

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