JP2011106626A - Manufacturing method of elastic part for mounting sub-frame of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent burr generation in molding an elastic part while simplifying a die for molding the elastic part, in a manufacturing method of the elastic part for mounting a sub-frame of a vehicle. <P>SOLUTION: In the manufacturing method of the elastic part for mounting a sub-frame of a vehicle, an elastic body 53 is molded integrally with first and second mounting members 51 and 52, and a collar 61 by using a molding die 112 which can be divided only into the upper and lower parts of the elastic part. The elastic part is then mounted by press-fitting a locking member into the upper end of the collar. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an elastic portion for attaching a sub-frame disposed below a vehicle body to the vehicle body.

  In general, the subframe disposed below the vehicle body is attached to the vehicle body by an elastic portion for vibration isolation. For example, a technique is known in which a front end portion, an intermediate portion, and a rear end portion of a subframe disposed below the vehicle body are attached to the vehicle body via elastic portions (see, for example, Patent Document 1).

  According to Patent Document 1, the elastic portion of the intermediate portion (hereinafter referred to as the intermediate elastic portion) is integrally formed between an upper metal fitting and a lower metal fitting made of a pair of upper and lower horizontal plates, and the upper metal fitting and the lower metal fitting. And an anti-vibration elastic body that is molded. The elastic body is made of rubber (rubber). The upper metal fitting is attached to the lower surface of the vehicle body with one bolt via a cylindrical collar extending upward from the upper surface. The lower metal fitting is attached to the side surface of the subframe with a plurality of bolts via a bracket extending downward from the side end.

  For the convenience of assembly work, the intermediate elastic portion is often attached to the vehicle body before being attached to the subframe. The intermediate elastic portion is attached to the vehicle body by screwing one bolt that penetrates through the cylindrical collar into the vehicle body. During the screwing operation of the bolt, there is a possibility that so-called co-rotation occurs in which the collar rotates in the same direction as the bolt. When the intermediate elastic portion rotates together, the mounting direction with respect to the subframe varies.

  On the other hand, generally, an anti-rotation member is fixed to the upper end of the collar by welding or the like. By locking the rotation preventing member on the vehicle body, the collar does not rotate together during the operation of fastening the bolt.

  By the way, in order to manufacture the intermediate elastic part, an upper metal fitting, a lower metal fitting, and a collar are set in a molding die, and a rubber composition is injected into a cavity formed inside the die and cured. An elastic body will be formed. However, since the anti-rotation member is fixed to the collar, the mold must be complicated. That is, the mold needs to be configured so as not to interfere with the rotation preventing member when opening and closing. For example, in addition to a mold that can be opened and closed up and down, it is conceivable to provide a slide mold that can be opened and closed left and right. In this case, the mold has a complicated configuration. Moreover, if the slide mold is simply provided, burrs caused by the mating surfaces (parting lines) between the slide molds may occur on the outer peripheral surface of the elastic body. Such burrs are not preferable for enhancing the durability of the elastic body.

JP 2004-98799 A

  The present invention provides a method for manufacturing an elastic part for mounting a sub-frame of a vehicle, and can simplify the mold for molding the elastic part and prevent the occurrence of burrs when the elastic part is molded. It is an issue to provide technology that can be used.

In the invention according to claim 1, an elastic part for attaching the subframe disposed below the vehicle body to the vehicle body is located below the vehicle body and above the subframe, A first mounting member to be mounted; a second mounting member mounted on the sub-frame, spaced apart from the first mounting member; and extending upward from an upper surface of the first mounting member; 2 A cylindrical collar that penetrates through the mounting member and has an upper end surface superimposed on the lower surface of the vehicle body, and vertically penetrates the first mounting member, and passes through the interior of the collar to be screwed to the vehicle body. As a result, a bolt for attaching the first mounting member to the vehicle body, and when the bolt is screwed to the vehicle body, the collar can be prevented from being hung on the vehicle body. A stopping member attached to the upper end of the collar consists of a resilient member which is molded integrally with the first and second mounting members and said collar,
First, the elastic body is formed integrally with the first and second mounting members and the collar using a mold that can be divided only above and below the elastic portion, and thereafter, with respect to the upper end of the collar. A method for manufacturing an elastic part for mounting a subframe of a vehicle, wherein the rotation preventing member is attached by press-fitting.

In the first aspect of the invention, first, the elastic body is formed integrally with the first and second mounting members and the collar using a mold that can be divided only above and below the elastic portion, and then the upper end of the collar. On the other hand, the detent member is attached by press-fitting.
For this reason, the shaping | molding die used when shape | molding an elastic body may be what can be divided | segmented only to the upper and lower sides of an elastic part. That is, it is not necessary to use a slide mold that can be separated in the lateral direction of the elastic portion. Therefore, the mold for molding the elastic portion can be configured simply, and the mechanism for clamping and opening the mold can be configured simply.
In addition, since a slide mold that can be separated in the lateral direction of the elastic portion is not used, it is possible to prevent the occurrence of vertical burrs during the formation of the elastic portion. For this reason, durability of an elastic body can be improved.
In addition, since the anti-rotation member is attached to the upper end of the collar simply by press-fitting, the attachment operation of the anti-rotation member to the collar can be easily performed.

It is a perspective view of the attachment structure of the vehicle body and sub-frame which concerns on this invention. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 2 is a perspective view of a subframe shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 4 is a detailed view of part 5 of FIG. 3. FIG. 6 is a detailed view of the intermediate elastic portion shown in FIG. 5. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. It is a perspective view which shows the relationship between the elastic part shown by FIG. FIG. 9 is a view taken in the direction of arrow 9 in FIG. 8. It is explanatory drawing of the process of setting a 1st, 2nd attachment member and a color | collar to a shaping | molding die in the manufacturing method of the intermediate | middle elastic part which concerns on this invention. It is explanatory drawing of the process of inject | pouring a rubber composition into the cavity of the shaping | molding die shown by FIG. It is explanatory drawing of the process of opening the shaping | molding die shown by FIG.

  EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated below based on an accompanying drawing.

First, the attachment structure of the vehicle subframe 11 according to the embodiment will be described.
As shown in FIGS. 1 and 2, the subframe 11 is attached to the front portion of the vehicle body 21 in the vehicle. The front portion of the vehicle body 21 is a monocoque body mainly composed of left and right front side frames 26 and 27. The left and right front side frames 26 and 27 extend in the longitudinal direction of the vehicle body on both sides of the front portion of the vehicle body.

  The subframe 11 is disposed below the vehicle body 21, that is, below the left and right front side frames 26 and 27, and mounts an engine and a transmission (not shown) and has left and right front suspensions attached to the left and right sides. is there.

  As shown in FIGS. 1 to 3, the sub-frame 11 is formed of a substantially rectangular frame in plan view, and has a front frame portion 36 that is elongated in the vehicle width direction, and a left frame portion that extends rearward from both ends of the front frame portion 36. 38 and a right frame portion 39, and a cross member 37 spanned between the left and right frame portions 38, 39.

  The attachment structure of the subframe 11 employs a so-called floating attachment structure in which the subframe 11 is attached to the vehicle body 21 via the six elastic portions 41, 41, 42, 42, 43, 43. . The details are as follows.

  The left and right front end portions 44 and 45 of the sub frame 11 are attached to the front support portions 31 and 31 of the left and right front side frames 26 and 27 via front elastic portions 41 and 41, respectively.

  The left and right rear end portions 46 and 47 of the subframe 11 are attached to the left and right front side frames 26 and 27 and the rear support portions 33 and 33 via the rear elastic portions 42 and 42, respectively.

  The left and right intermediate portions 48 and 49 of the sub frame 11 are attached to the central support portions 32 and 32 of the left and right front side frames 26 and 27 via intermediate elastic portions 43 and 43, respectively.

  Next, the left intermediate elastic portion 43 will be described in detail with reference to FIGS. Note that the right intermediate elastic portion 43 has the same configuration as the left intermediate elastic portion 43, and thus the description thereof is omitted.

  As shown in FIG. 4, the intermediate elastic portion 43 includes a first attachment member 51, a second attachment member 52, an elastic body 53, a collar 61, and a detent member 71.

  As shown in FIGS. 2 and 4, the first mounting member 51 is a member located below the vehicle body 21, that is, the left front side frame 26 and above the subframe 11. The first frame 75 is attached to the side frame 26). Thus, the first attachment member 51 is located between the vehicle body 21 and the subframe 11.

  As shown in FIGS. 4, 7, and 9, the first attachment member 51 is a horizontal flat plate formed in a square shape in plan view, and is configured by a metal plate such as a steel plate. The peripheral edge of the first attachment member 51 is edged by being folded back toward the subframe 11 (downward). That is, at the periphery of the first mounting member 51, there are a rounded portion 74a (bent portion 74a) bent downward in a circular arc shape with a predetermined bending radius, and a rib portion 74 extending downward from the lower end of the rounded portion 74a. Is formed. The rib portion 74 is at a right angle with respect to the first mounting member 51. Further, the first mounting member 51 has a bolt insertion hole 76 that penetrates vertically in the center.

As shown in FIGS. 4, 7, and 9, the second mounting member 52 is located immediately above the first mounting member 51, and is further away from the first mounting member 51 by a predetermined distance. It is a member and is attached to the subframe 11. Here, about the predetermined distance which the 2nd attachment member 52 is separated with respect to the 1st attachment member 51, it sets to the magnitude | size which the elastic body 53 can fully exhibit vibration proof performance.
If it demonstrates in detail, the 2nd attachment member 52 consists of a horizontal flat plate formed in the planar view square shape, and is comprised by metal plates, such as a steel plate. The second mounting member 52 is parallel to the first mounting member 51.

  The second mounting member 52 has an opening 63 penetrating vertically in the center. The opening 63 is concentric with the bolt insertion hole 76 of the first mounting member 51. The diameter of the opening 63 is larger than the diameter of the bolt insertion hole 76. The edge of the opening 63 is edged by folding back (upward) toward the lower surface of the vehicle body 21 (the lower surface 26a of the left front side frame 26). That is, an anchor portion 92 that is bent upward in a circular arc shape with a predetermined bending radius and extends upward from its upper end is formed at the edge of the opening 63. The anchor portion 92 is perpendicular to the second mounting member 52.

  Further, as shown in FIGS. 4 to 9, the second mounting member 52 includes a bracket portion 91 that extends downward from one end of the outer peripheral edge (toward the subframe 11). For example, the bracket portion 91 is formed by bending the end of the flat plate-like second attachment member 52. The overall shape of the second mounting member 52 having the bracket portion 91 is generally L-shaped in an upside down direction when viewed from the side.

  The bracket portion 91 is formed with a long and narrow elongated hole 93 which is opened at the lower edge so that the second bolts 87 and 87 can be passed therethrough. For this reason, the bracket portion 91 is attached to the support portion 47 </ b> A extending upward from the subframe 11 by the second bolts 87 and 87, for example. As a result, the second attachment member 52 is attached to the left intermediate portion 48 of the subframe 11 as described above.

  Thus, the first mounting member 51, the second mounting member 52, and the front side frame 26 are positioned higher than the subframe 11 in this order.

  As shown in FIGS. 4 and 7, the collar 61 is a cylindrical member made of a metal material such as a steel pipe, and is positioned perpendicular to the upper surface 73 of the first mounting member 51. It is placed on the upper surface 73. However, fixing the collar 61 to the first mounting member 51 is optional.

  The collar 61 extends upward from the upper surface 73 of the first mounting member 51, passes through the opening 63 of the second mounting member 52, and the upper end surface 62 is the lower surface of the vehicle body 21 (the lower surface 26 a of the left front side frame 26). ) Is a member for positioning the first mounting member 51 in the vertical direction with respect to the vehicle body 21.

  As shown in FIGS. 4 and 7, the first attachment member 51 is attached to the vehicle body 21 with a first bolt 75. More specifically, a nut 85 is fixed inside the left front side frame 26. The first bolt 75 is a fastening member that is screwed into the nut 85.

  The first bolt 75 is inserted into the bolt insertion hole 76 from below the first mounting member 51, and vertically penetrates the bolt insertion hole 76 of the first mounting member 51 and penetrates the inside of the collar 61 (through hole 61 a). Then, it is screwed to the nut 85 of the vehicle body 21. The first mounting member 51 and the collar 61 are fastened to the vehicle body 21 by the head of the first bolt 75 in contact with the lower surface 78 of the first mounting member 51 and the nut 85, whereby the first mounting member 51 is attached to the vehicle body 21. A member 51 is attached.

  As shown in FIGS. 4 and 8, the rotation preventing member 71 can prevent the collar 61 from being rotated by being hooked on the vehicle body 21 when the first bolt 75 is screwed to the vehicle body 21. It is attached to the upper end of 61. More specifically, a fitting hole 81 is formed in the upper end portion of the collar 61. The fitting hole 81 is concentric with the through hole 61a and has a larger diameter than the through hole 61a.

  The anti-rotation member 71 is a metal integrally formed product including the fitting ring portion 82 and the latching claw 83. The fitting ring portion 82 is a short cylindrical member having a flange 84 at one end, and is fitted into the fitting hole portion 81 by press fitting. In this case, the fitting ring portion 82 is inserted until the flange 84 hits the upper end surface 62 of the collar 61. The degree of “fitting” of the fitting ring portion 82 with respect to the fitting hole portion 81 is set such that the relative rotation of the rotation preventing member 71 with respect to the collar 61 is restricted. For this reason, the fitting ring portion 82 is integrally coupled to the fitting hole portion 81 so as not to rotate relatively. The upper end surface 62 of the collar 61 is superimposed on the lower surface of the vehicle body 21 (the lower surface 26a of the left front side frame 26) via the flange 84.

  The latching claw 83 is a substantially L-shaped member that extends radially outward from the outer peripheral surface of the flange 84 and further extends toward the vehicle body 21 from the tip. The latching claw 83 can be fitted into a latching recess 26b formed on the lower surface of the vehicle body 21 (the lower surface 26a of the left front side frame 26). The rotation of the collar 61 with respect to the vehicle body 21 is restricted by inserting the latching claw 83 into the latching recess 26b and latching in a state where the rotation preventing member 71 is attached to the collar 61. As a result, the rotation of the intermediate elastic portion 43 relative to the vehicle body 21 is restricted. In addition, the presence or absence of the flange 84 is arbitrary.

  As shown in FIGS. 4 and 7, the elastic body 53 is a vibration isolating member interposed between the first mounting member 51 and the second mounting member 52 and is made of rubber (rubber). The elastic body 53 is formed integrally with the first and second mounting members 51 and 52 and the collar 61 so as to wrap the collar 61 together with the first and second mounting members 51 and 52. The outer peripheral surface of the collar 61 is surrounded by the elastic body 53 up to a portion higher than the second mounting member 52. That is, the lower half portion of the collar 61 is wrapped by the elastic body 53. For this reason, the first and second mounting members 51 and 52, the collar 61 to which the anti-rotation member 71 is coupled, and the elastic body 53 are integrally coupled to each other to form one intermediate elastic portion 43. is doing.

  As described above, as shown in FIGS. 4 and 7, a rib portion 74 is formed on the periphery of the first mounting member 51 and extends downward via an arc-shaped round portion 74 a. The elastic body 53 coupled between the first and second attachment members 51 and 52 further extends downward so as to wrap around the outer peripheral surface of the rib portion 74, and is integrally coupled to the rib portion 74. That is, the elastic body 53 is coupled to the outer peripheral surfaces of the rounded portion 74 a and the rib portion 74 in addition to the upper surface 73 of the first mounting member 51. For this reason, the joint surface between the 1st attachment member 51 and the elastic body 53 spreads. Since the bonding area is increased, the stress when a load is applied can be dispersed. In addition, since the arcuate round portion 74a is provided on the periphery of the first mounting member 51, the concentration of stress generated at the periphery can be suppressed. Therefore, the durability of the portion where the elastic body 53 is coupled to the first mounting member 51 can be enhanced.

  As shown in FIGS. 4 and 7, the edge of the opening 63 of the second mounting member 52 is bent upward in an arc shape, and an annular anchor portion 92 extending upward from its upper end is formed. . The inner diameter of the anchor portion 92 is set larger than the outer diameter of the collar 61. The elastic body 53 is also interposed between the outer peripheral surface of the collar 61 and the inner peripheral surface of the anchor portion 92. The thickness Ti (see FIG. 7) of the portion interposed between the outer peripheral surface of the collar 61 and the inner peripheral surface of the anchor portion 92 corresponds to the difference in diameter between the collar 61 and the anchor portion 92. The difference in diameter, that is, the thickness Ti is preferably large in order to improve the durability of the elastic body 53.

  By the way, in order to transmit the load between the first and second mounting members 51 and 52 via the elastic body 53 and to improve the vibration damping performance by the elastic body 53, the space between the second mounting member 52 and the elastic body 53 can be improved. It is conceivable to increase the bonding area. To that end, it is conceivable to make the opening 63 of the second mounting member 52 have a small diameter. When the diameter of the opening 63 is reduced, the gap between the edge of the opening 63 and the outer peripheral surface of the collar 61 is reduced. The thickness Ti of the elastic body 53 interposed in the gap is also reduced. As a result, the amount of deformation in the vertical direction (strain amount) increases in the portion where the thickness Ti is small in the elastic body 53 with respect to the load. In order to increase the durability of the elastic body 53, it is required to increase the thickness Ti.

  On the other hand, as described above, the edge of the opening 63 of the second mounting member 52 of the embodiment is bent upward in an arc shape, and an annular anchor portion 92 extending upward from its upper end is formed. Yes. Accordingly, the coupling area between the second mounting member 52 and the elastic body 53 can be increased. Since the bonding area is increased, the stress when a load is applied can be dispersed. In addition, since the gap between the edge of the opening 63 and the anchor portion 92 is formed in an arc shape, it is possible to suppress the concentration of stress generated in the peripheral portion. Therefore, the strength of the portion where the elastic body 53 is coupled to the second mounting member 52 can be increased.

  Furthermore, as described above, by having the anchor portion 92, the coupling area between the second mounting member 52 and the elastic body 53 is increased. For this reason, it is not necessary to make the opening 63 small in diameter in order to increase the coupling area. At the position of the opening 63, the thickness Ti of the elastic body 53 can be increased, and as a result, the amount of deformation (strain amount) in the vertical direction in the portion where the thickness Ti is increased can be reduced. Therefore, the durability of the elastic body 53 can be enhanced.

  As shown in FIGS. 4, 6, and 7, in the upper surface 52 a of the second mounting member 52, the portion through which the collar 61 passes (the opening 63 and the anchor portion 92) and the periphery thereof are wrapped with an elastic body 53. It is. That is, the elastic body 53 wraps the upper surface 52a and the opening 63 of the second mounting member 52, and further has a bulging portion 67 for wrapping the anchor portion 92. For this reason, the concentration of stress generated in the elastic body 53 can be suppressed in the portion where the collar 61 penetrates and in the periphery thereof. Therefore, the durability of the portion where the elastic body 53 is coupled to the second mounting member 52 can be enhanced.

The mounting structure of the sub-frame 11 having the above configuration has the following operations and effects.
As shown in FIG. 4, in the attachment structure of the subframe 11, the second attachment member 52 is disposed in the intermediate elastic portion 43 directly above the first attachment member 51 attached to the vehicle body 21 via the elastic body 53. The second attachment member 52 is attached to the subframe 11.

  For this reason, the downward load of the subframe 11 is transmitted as a compressive load from the second mounting member 52 onto the elastic body 53, further transmitted from the elastic body 53 onto the first mounting member 51, and from the first mounting member 51. It is transmitted to the vehicle body 21.

  That is, the elastic body 53 is compressed between the first and second attachment members 51 and 52. Therefore, the durability of the elastic body 53 can be enhanced, and the durability of the coupling of the elastic body 53 to the first and second mounting members 51 and 52 can be enhanced.

  In addition, the elastic body 53 includes a first and second mounting members 51 so as to wrap the collar 61 for positioning the first mounting member 51 in the vertical direction with respect to the vehicle body 21 and the first and second mounting members 51 and 52. The mounting members 51 and 52 and the collar 61 are integrally formed. Therefore, the vibration in the vertical direction transmitted from the sub frame 11 to the first mounting member 51 can be sufficiently received and absorbed by the elastic body 53.

  Next, a method for manufacturing the intermediate elastic portion 43 for attaching the subframe 11 according to the embodiment will be described with reference to FIGS. 8 and 10 to 12. The process for manufacturing the intermediate elastic portion 43 is as follows.

  First, the first and second mounting members 51 and 52 and the collar 61 shown in FIG. 12 and the anti-rotation member 71 shown in FIG. 8 are prepared (first step, metal member preparation step). It should be noted that the anti-rotation member 71 may be prepared later.

  Next, an adhesive (not shown) is applied by applying an adhesive to predetermined portions of the first and second mounting members 51 and 52 and the collar 61, that is, at least a surface coupled to the elastic body 53 (see FIG. 7). A layer is formed (second step, adhesive application step). By applying the adhesive, the connection state of the elastic body 53 to the first and second mounting members 51 and 52 and the collar 61 can be made firm.

  Next, as shown in FIG. 10, the first and second mounting members 51 and 52 and the collar 61 are set and clamped in the molding die 112 attached to the molding machine 111 (third step, metal member). Set process). Here, the mold 112 is a two-part mold that can be divided only above and below the elastic body 53 (see FIG. 7). The opening and closing direction of the mold 112 coincides with the longitudinal direction of the collar 61 shown in FIG. That is, the molding die 112 includes an upper die 120 and a lower die 130 that can be opened and closed in the vertical direction. For example, the lower mold 130 is a fixed mold that is fixed, and the upper mold 120 is a movable mold that can move up and down with respect to the lower mold 130.

  The upper mold 120 has a mating surface 121 (divided surface 121) at the lower end, a mold surface 122 formed inward from the mating surface 121, and a color holding portion formed in the center of the mold surface 122. 123. The mating surface 121 is set so as to coincide with or substantially coincide with the upper surface 52a of the second mounting member 52 shown in FIG. The mold surface 122 is a concave portion of a portion for molding the upper half portion of the elastic body 53 shown in FIG. The color holding portion 123 is a recess that holds the upper half portion of the collar 61 shown in FIG.

  The lower mold 130 has a mating surface 131 (divided surface 131) at the upper end, a mold surface 132 formed inward from the mating surface 131, and a first attachment formed in the center of the mold surface 132. A member holding part 133 and a second attachment member holding part 134 are provided. The mating surface 131 is set to coincide with or substantially coincide with the upper surface 52a of the second mounting member 52. The mold surface 132 is a concave portion of a portion for molding the lower half portion of the elastic body 53 shown in FIG. The 1st attachment member holding part 133 is a recessed part which hold | maintains the 1st attachment member 51 shown in FIG. 7 in a fixed position. The second attachment member holding portion 134 is a recess that holds the second attachment member 52 shown in FIG. 7 at a fixed position.

  As a specific setting method in the third step, the collar 61 is set in the collar holding portion 123 as indicated by the arrow b1, the first attachment member 51 is set in the first attachment member holding portion 133 as indicated by the arrow b2, The second attachment member 52 is set on the second attachment member holding portion 134 as shown by an arrow b3. Thereafter, the mold 112 is clamped. At this time, the mating surfaces 121 and 131 coincide with the upper surface 52a of the second mounting member 52 as shown in FIG. A cavity 113 is formed inside the mold 112.

  Next, as shown in FIG. 11, an unvulcanized rubber composition (rubber material) is injected into the cavity 113 of the mold 112 and vulcanized to form a rubber member having a predetermined shape. Is bonded to the first and second mounting members 51 and 52 and the collar 61 to form the elastic body 53 (fourth step; elastic body forming step). As a method of injecting the rubber composition into the cavity 113, a known method such as an injection molding method or a transfer molding method is used.

  As a result, the elastic body 53 is integrally coupled to the first and second mounting members 51 and 52 and the collar 61 and encloses predetermined portions of the first and second mounting members 51 and 52 and the collar 61. The member in which the elastic body 53 is coupled to the first and second mounting members 51 and 52 and the collar 61 in this way is referred to as an elastic portion semi-finished product 43A. Since the parting line 114 of the molding die 112, that is, the mating surfaces 121 and 131 coincide with the upper surface 52 a of the second mounting member 52, no burrs are generated in the molded elastic body 53.

  Next, as shown in FIG. 12, the mold 112 is opened to take out the elastic part semi-finished product 43 </ b> A (fifth step, step of taking out the elastic part semi-finished product).

  Next, as shown in FIG. 8, the intermediate elastic part 43 shown in FIG. 6 is completed by attaching the rotation preventing member 71 to the upper end (upper end surface 62) of the collar 61 by press fitting (sixth step, elasticity). Body molding process).

  Thus, according to the method for manufacturing the intermediate elastic portion 43, when the molding die 112 is opened, the collar 61 can be removed from the upper die 120, and the molding die 112 (upper die 120) holding the collar 61 can be removed. The structure becomes simple.

  That is, according to the method for manufacturing the intermediate elastic portion 43 (hereinafter, referred to as the elastic portion 43), the elastic body 53 is first and first formed using the mold 112 that can be divided only above and below the elastic portion 43. (2) The mounting members 51 and 52 and the collar 61 are integrally molded, and then the rotation preventing member 71 is press-fitted into the upper end (upper end surface 62) of the collar 61.

  For this reason, when the elastic body 53 is molded, the anti-rotation member 71 (see FIG. 7) that protrudes radially outward from the collar 61 is not attached to the collar 61. Since there are no protrusions radially outward, the molding die 112 used when molding the elastic body 53 may be one that can be divided only above and below the elastic portion 43. That is, it is not necessary to use a slide mold that can be separated in the lateral direction of the elastic portion 43. Therefore, the mold 112 for molding the elastic portion 43 can be configured simply, and the mechanism for clamping and opening the mold 112 can be configured simply.

  In addition, since a slide mold that can be separated in the lateral direction of the elastic portion 43 is not used, it is possible to prevent occurrence of vertical burrs when the elastic portion 43 is formed. For this reason, durability of the elastic body 53 can be improved.

  In addition, since the anti-rotation member 71 is attached to the upper end surface 62 of the collar 61 by simply press-fitting, the attaching operation of the anti-rotation member 71 to the collar 61 can be easily performed.

  The manufacturing method of the present invention is suitable for manufacturing an elastic part for attaching a subframe of a vehicle.

  DESCRIPTION OF SYMBOLS 11 ... Subframe, 21 ... Vehicle body, 26a ... Lower surface of vehicle body, 43 ... Elastic part (intermediate elastic part), 51 ... First attachment member, 52 ... Second attachment member, 52a ... Upper surface of second attachment member, 53 ... Elastic body 61... Collar 62. Upper end surface of collar 71 71 anti-rotation member 73 upper surface of first mounting member 75 ... bolt (first bolt) 112 ... molding die 120 ... upper die 130 ... lower mold.

Claims (1)

An elastic portion for attaching the subframe disposed below the vehicle body to the vehicle body,
A first mounting member that is positioned below the vehicle body and above the subframe, and is attached to the vehicle body;
A second mounting member that is positioned directly above the first mounting member and is mounted on the subframe;
A cylindrical collar extending upward from the upper surface of the first mounting member, penetrating the second mounting member, and having an upper end surface superimposed on the lower surface of the vehicle body;
A bolt for attaching the first attachment member to the vehicle body by vertically passing through the first attachment member, passing through the inside of the collar, and screwed to the vehicle body,
When the bolt is screwed to the vehicle body, the rotation preventing member attached to the upper end of the collar so that the collar can be locked by being hung on the vehicle body,
The first and second mounting members and the elastic body formed integrally with the collar,
First, using a mold that can be divided only above and below the elastic portion, the elastic body is integrally formed with the first and second mounting members and the collar,
Thereafter, the anti-rotation member is attached to the upper end of the collar by press-fitting, and the method for manufacturing an elastic part for attaching a sub-frame of a vehicle is provided.

Images