JP5919974B2 - Shock absorber - Google Patents

Description

  The present invention relates to a shock absorber, and more particularly, to a shock absorber suitable for a knee bolster, a bumper absorber, and the like.

  For vehicles such as automobiles, it constitutes a part of the body that is positioned on the opposite side (back side) of the interior part to the passenger compartment side of the interior part that is likely to come into contact with the passengers in the event of a collision accident A shock absorber for absorbing a shock is installed in an installation space between body components such as various panels. With this shock absorber, when an occupant comes into contact with these interior parts in a collision accident or the like, the impact applied to the occupant is mitigated to protect the occupant. An example of this type of shock absorber is a knee bolster.

  In recent years, a bumper structure has also been designed that can reduce the pedestrian's damage value by reducing the load on the pedestrian's legs in an interpersonal accident. Examples of the shock absorber to be used include a bumper absorber. The bumper absorber is usually installed in an installation space between the bumper fascia and the bumper reinforcement.

  For example, as a technical document filed prior to the present invention, Patent Document 1 (Japanese Patent Publication No. 2002-522286) discloses an inflatable knee support member.

  Patent Document 2 (Japanese Patent Laid-Open No. 2006-130936) discloses an impact absorber suitable for a vehicle door, roof, bonnet, and the like.

  Japanese Patent Application Laid-Open No. 2008-213577 discloses a bumper absorber disposed in a bumper system of an automobile.

Special Table 2002-522286 JP 2006-130936 A JP 2008-213577 A

  By the way, many of the above-described shock absorbers are designed in a shape corresponding to the installation space and disposed in the installation space. However, depending on the mounting condition with the mounting object to which the shock absorber is mounted, when the shock absorber receives an impact, the shock absorber falls down and the shock cannot be effectively absorbed. .

  This invention is made | formed in view of the said situation, and it aims at providing the shock absorber which is hard to fall down when it receives an impact.

  In order to achieve this object, the present invention has the following features.

The shock absorber according to the present invention is
A mounting wall to be mounted on the mounting object; and a front wall facing the mounting wall;
A parting line is formed extending to the mounting wall and the front wall ,
The said mounting wall, at a position different from that of the parting line, have a projected portion that projects toward the attachment object,
The convex portions are formed on both sides across the parting line,
The length in the short direction of the mounting wall is shorter than the maximum distance from the mounting wall to the front wall ,
It is characterized by that.

  According to the present invention, it is possible to make it difficult to fall down when subjected to an impact.

1 is a view showing a state in which an impact absorber 10 of the present embodiment is attached to an automobile 100 as an impact absorber of a knee support member 106. FIG. 1 is a diagram illustrating an example of the overall configuration of an impact absorber 10 of the present embodiment and an attachment object 20 to which the impact absorber 10 is attached. It is a figure which shows the cross-sectional structural example of the 3X-3X 'line | wire of the shock absorber 10 shown in FIG. FIG. 4 is a diagram illustrating a cross-sectional configuration example taken along line 4X-4X ′ of the shock absorber 10 illustrated in FIG. 2. FIG. 5 is a diagram illustrating a cross-sectional configuration example taken along line 5X-5X ′ of the shock absorber 10 illustrated in FIG. 2. It is a figure which shows the structural example by the side of the 1st side wall 4 of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of the 2nd side wall 5 of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of A (back wall 3A side) of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of B (upper wall 3B side) of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of C (lower wall 3C side) of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of D (front wall 3D side) of the shock absorber 10 shown in FIG. 4 is a view showing a state in which the shaft portion 11 and the drop prevention portions 12, 13 of the main body 3 are inserted into the shaft hole 21 and the mounting holes 22, 23 provided in the attachment object 20. FIG. FIG. 3 is a view showing a state in which a main body 3 is rotated with a shaft portion 11 as a rotation shaft, and a part of restricting portions 12b and 13b provided at the tips of drop prevention portions 12 and 13 are overlapped with an attachment object 20. It is a figure which shows the structural example by the side of the 1st side wall 4 of the shock absorber 10 attached to the attachment target object 20. FIG. 4 is a diagram illustrating a configuration example on the front wall 3D side of the shock absorber 10 attached to the attachment object 20. FIG. It is a figure which shows the cross-sectional structural example of the 16X-16X 'line shown in FIG. It is a figure which shows the structural example of 3 A of back walls. FIG. 3 is a diagram showing a configuration example of a split mold 200 that forms a rear wall 3A. FIG. 6 is a view showing an example of a bent configuration of groove-like ribs 6 and 7; It is a figure which shows the other structural example of front wall 3D. It is a 1st figure which shows the structural example which provided the latching | locking parts 14 and 15. FIG. It is a 2nd figure which shows the structural example which provided the latching | locking parts 14 and 15. FIG. 3 is a perspective view seen from the rear wall 3A side of the shock absorber 10. FIG. 3 is a perspective view of the shock absorber 10 as seen from the front wall 3D side. FIG. It is a figure which shows the measurement result of impact absorption performance. It is a figure which shows the structural example of the shock absorber used for the measurement test of shock absorption performance. It is a figure which shows the example of whole structure of the impact absorber 10 of 2nd Embodiment, and the attachment target object 20 to which the impact absorber 10 is attached. It is a figure which shows the cross-sectional structural example of the 28X-28X 'line | wire of the shock absorber 10 shown in FIG. It is a figure which shows the cross-sectional structure example of the 29X-29X 'line | wire of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of the upper wall 3B of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of the lower wall 3C of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of A (rear wall 3A side) of the shock absorber 10 shown in FIG. It is a figure which shows the structural example by the side of D (front wall 3D side) of the shock absorber 10 shown in FIG. 3 is a view showing a state of the shock absorber 10 attached to the attachment object 20 as seen from the front wall 3D side. FIG. FIG. 35 is a diagram showing a cross-sectional configuration example taken along line 35X-35X ′ shown in FIG. 34.

(Outline of the shock absorber 10 of the present embodiment)
First, an outline of the shock absorber 10 of the present embodiment will be described with reference to FIGS. 2 and 16. FIG. 2 is a diagram illustrating an overall configuration example of the shock absorber 10 of the present embodiment and the attachment object 20 to which the shock absorber 10 is attached. FIG. 16 is a diagram illustrating a configuration example of the shock absorber 10 attached to the attachment object 20.

  As shown in FIG. 2, the shock absorber 10 of the present embodiment has one end (corresponding to the upper wall 3B side) and the other end (lower wall 3C side) of the mounting wall (corresponding to the rear wall 3A) to be attached to the mounting object 20. The parting line PL is formed to extend to the mounting wall 3A and protrudes toward the mounting object 20 at a position different from the parting line PL as shown in FIG. It has the convex part 30 which was made.

  Further, the shock absorber 10 of the present embodiment is characterized in that the surfaces of the mounting walls 3A on both sides of the parting line PL are located on the same plane.

  The shock absorber 10 of the present embodiment has a convex portion 30 that protrudes toward the mounting object 20 on the mounting wall 3A, so that when the shock absorber 10 receives a shock, the convex portion Since 30 abuts on the attachment object 20, the shock absorber 10 can be made difficult to fall. Further, the shock absorber 10 of this embodiment is configured such that the surfaces of the mounting walls 3A on both sides are located on the same plane across the parting line PL, so that the shock absorber 10 receives a shock. In this case, since the surfaces of the attachment walls 3A on both sides abut against the attachment object 20 across the parting line PL, the shock absorber 10 can be made difficult to fall. Hereinafter, the shock absorber 10 of the present embodiment will be described in detail with reference to the accompanying drawings.

(First embodiment)
<Installation example of shock absorber 10>
First, an example of mounting the shock absorber 10 of this embodiment will be described with reference to FIG. FIG. 1 shows a state where the shock absorber 10 shown in FIGS. 2 to 11 is attached to the automobile 100 as a shock absorber of the knee support member 106.

  An automobile 100 shown in FIG. 1 includes an occupant compartment 103 including a front seat 102 for an occupant including a driver 101, and a meter 104 is located on a side wall of the handle 105. The steering wheel 105 is connected to a steering column (not shown), and a steering support member that supports the steering column is supported on the inner wall surface of the vehicle body and provided in the vehicle width direction.

  The shock absorber 10 (see FIGS. 2 to 11) of the present embodiment is attached as a knee support member 106 on the driver's seat side with the steering column sandwiched on both sides of the steering column. However, the space on both sides of the steering column is vertically long in relation to the installation space of other vehicle components (meter 104, navigation device, air conditioner, etc.). A knee support member 106 is attached so as to be adjacent to the knee 107. Thus, when the automobile 100 receives an impact, the knee 107 of the driver 101 comes into contact with each of the knee support members 106, absorbs the impact by the knee support member 106, and reduces the impact applied to the knee 107. Yes. Although FIG. 1 shows the knee support member 106 on the driver's seat side, the knee support member is also adjacent to the passenger's knee on the passenger seat side on the passenger seat side, similarly to the driver seat side. Will be attached.

<Configuration example of shock absorber 10>
Next, a configuration example of the shock absorber 10 of the present embodiment will be described with reference to FIGS. FIG. 2 is a diagram illustrating an example of the overall configuration of the shock absorber 10 of the present embodiment and an attachment object 20 to which the shock absorber 10 is attached. FIG. 3 is a diagram of the shock absorber 10 shown in FIG. 4 shows a cross-sectional configuration example taken along line 3X-3X ′, FIG. 4 shows a cross-sectional configuration example taken along line 4X-4X ′ of the shock absorber 10 shown in FIG. 2, and FIG. 5 shows the shock absorber 10 shown in FIG. It is a figure which shows the cross-sectional structural example of a 5X-5X 'line. 6 shows a configuration example on the first side wall 4 side of the shock absorber 10 shown in FIG. 2, and FIG. 7 shows a configuration example on the second side wall 5 side of the shock absorber 10 shown in FIG. . 8 shows an example of the configuration on the A side (rear wall 3A side) of the shock absorber 10 shown in FIG. 2, and FIG. 9 shows the configuration on the B side (upper wall 3B side) of the shock absorber 10 shown in FIG. It is a figure which shows an example. 10 shows a configuration example of the shock absorber 10 shown in FIG. 2 on the C side (lower wall 3C side), and FIG. 11 shows a configuration of the shock absorber 10 shown in FIG. 2 on the D side (front wall 3D side). It is a figure which shows an example. In the present embodiment, a case where a sheet metal is used as the attachment object 20 will be described. However, the attachment object 20 is not limited to a sheet metal, and any member can be applied.

  The shock absorber 10 of this embodiment is formed by blow-molding a thermoplastic resin into a hollow shape. As shown in FIG. A plurality of groove-like ribs 6 and 7 formed by recessing the second side wall 5 toward the other are provided. As shown in FIG. 2, the groove-like ribs 6 and 7 formed on the first side wall 4 and the second side wall 5 extend from the front wall 3D toward the rear wall 3A, and the extending direction is the same as the impact direction. The direction is preferred. Thereby, the rigidity with respect to the impact from an impact direction can be improved.

  The shock absorber 10 of the present embodiment receives an impact on the front wall 3D shown in FIG. 11, and the impact received on the front wall 3D is attached via the rear wall 3A shown in FIG. 8 facing the front wall 3D. I try to tell things 20. In the shock absorber 10 of this embodiment, the parting line PL extends to the upper wall 3B, the front wall 3D, the lower wall 3C, and the rear wall 3A, and the rigidity of the shock absorber 10 is enhanced. Thereby, when an impact is received at the front wall 3D, the shock absorber 10 can be made difficult to break.

  When the shock absorber 10 of the present embodiment is used as the knee support member 106 described above, the shape of the shock absorber 10 is small, so that the location of the load point that receives the impact (the hitting point position) is the vertical direction from the ideal position. Or the left and right direction, and the approach angle of the impact entering the front wall 3D is likely to deviate from the ideal approach angle in the up and down direction and the left and right direction. Note that the above-described deviation occurs more significantly in the vertical direction than in the horizontal direction. For this reason, in the shock absorber 10 of the present embodiment, the parting line PL extends from the upper wall 3B, the front wall 3D, the lower wall 3C, and the rear wall 3A. As a result, the shock absorber 10 can be made difficult to break even when an impact is received at the front wall 3D in a state where the above-described deviation occurs.

  Further, as shown in FIG. 11, the front wall 3D has a parting line PL extending from the upper end (upper wall 3B side) and the lower end (lower wall 3C side) to increase the rigidity of the front wall 3D. Yes. Thereby, when the front wall 3D receives an impact, the front wall 3D can be made difficult to break.

  Further, in the front wall 3D, the groove-like ribs 6 and 7 are provided so that the distances from the bottoms of the groove-like ribs 6 and 7 to the parting line PL are equal (a1 = a2, b1 = b2, c1). = c2). The distance from the bottom of the groove-like ribs 6 and 7 to the parting line PL is a value measured in a state where the line connecting the bottom of the groove-like ribs 6 and 7 and the parting line PL is orthogonal to the parting line PL. It is. In the front wall 3D, the distance (a1, b1, c1) from the bottom of the groove-like rib 6 provided on the first side wall 4 to the parting line PL, and the bottom of the groove-like rib 7 provided on the second side wall 5 By making the distances (a2, b2, c2) from to the parting line PL equal, the thickness of the groove-like ribs 6, 7 can be made constant. For this reason, even if the load point location (striking point position) that receives an impact on the front wall 3D deviates from the ideal position, or the impact angle of the impact that enters the front wall 3D deviates from the ideal entry angle, the desired point can be obtained. The load can be stably maintained and a desired amount of shock absorption can be ensured.

  The shape of the parting line PL is not particularly limited as long as it satisfies the above-described conditions and extends continuously from the upper end (upper wall 3B side) and the lower end (lower wall 3C side). It can comprise in arbitrary shapes, such as. However, the shock absorber 10 of the present embodiment receives an impact on the front wall 3D side and attaches the rear wall 3A side to the attachment object 20, so that the parting line PL that passes through the front wall 3D and the rear wall 3A is used. It is preferable that the surface is formed flat without leaving the compression portion CP, and the compression portion CP is left in the parting line PL passing through the upper wall 3B and the lower wall 3C. The compression portion CP can be formed by sandwiching and welding a thermoplastic resin with a split mold when the shock absorber 10 is molded. As a result, it is possible to prevent occurrence of cracks from the parting line PL and realize stable shock absorption.

  Further, as shown in FIGS. 6 and 7, the first side wall 4 and the second side wall 5, which are peripheral walls connecting the front wall 3D and the rear wall 3A, are directed from the front wall 3D toward the rear wall 3A. Groove-like ribs 6 and 7 are formed. The groove-like ribs 6 and 7 are formed so that the extending direction α of the groove-like ribs 6 and 7 and the vertical direction β perpendicular to the surface of the rear wall 3A form a predetermined angle θ and It is formed on the second side wall 5. The predetermined angle θ is an angle at which the extending direction α of the groove-like ribs 6 and 7 is the same as the impact direction when the rear wall 3A is attached to the attachment object 20. Thereby, when an impact is received at the front wall 3D, the impact can be effectively absorbed by the groove-like ribs 6 and 7 while increasing the rigidity against the impact.

  In this embodiment, as shown in FIGS. 6 and 7, the elongated groove-like ribs 6, 7 are formed continuously in the extending direction α, but are limited to the elongated groove-like ribs 6, 7. Instead, it is also possible to form ribs having any shape extending in the direction α. For example, triangular or trapezoidal groove-like ribs 6 and 7 can be formed extending in the direction α. In this case, it is preferable that the groove-like rib 6 formed on the first side wall 4 side and the groove-like rib 7 formed on the second side wall 5 side have the same shape. Thereby, the impact can be absorbed evenly by both groove-like ribs 6 and 7.

  In the present embodiment, the elongated groove-like ribs 6 and 7 are continuously formed extending in the direction α. However, it is also possible to form the groove-like ribs 6 and 7 intermittently (partially) in the extending direction α without forming the groove-like ribs 6 and 7 in a part of the extending direction α. Also in this case, since the extending direction α of the groove ribs 6 and 7 is the same direction as the impact direction, the groove ribs 6 and 7 can effectively absorb the shock. However, it is preferable to form the groove-like ribs 6 and 7 continuously connected in the extending direction α as in the present embodiment. Thereby, the groove-like ribs 6 and 7 formed continuously in the extending direction α are made to approach the first side wall 4 and the second side wall 5 facing each other, or the first side wall 4 and the second side wall facing each other. Can be bent so that it protrudes away from 5. As a result, a further impact absorbing effect can be exhibited.

  As the thermoplastic resin constituting the shock absorber 10 of the present embodiment, a known resin can be applied. For example, it may be composed of a resin having a high mechanical highness such as a polyolefin resin such as polyethylene or polypropylene, a styrene resin such as polystyrene or ABS resin, a polyester resin such as polyethylene terephthalate, polyamide or a mixture thereof. it can.

  In addition, in a range not impairing mechanical strength (impact resistance), for example, fillers such as silica, pigments, dyes, heat stabilizers, light stabilizers, plasticizers, antistatic agents, flame retardants, flame retardants, One type or two or more types of additives used in this field such as anti-aging agent, ultraviolet absorber, antioxidant, anti-fogging agent and lubricant can also be contained.

  As shown in FIG. 2, the shock absorber 10 of this embodiment includes a shaft portion 11 protruding from the rear wall 3 </ b> A of the main body 3 and drop prevention portions 12 and 13. The shaft portion 11 and the drop prevention portions 12 and 13 constitute an attachment portion for attaching the shock absorber 10 to the attachment object 20. The main body 3 is composed of six walls, an upper wall 3B, a rear wall 3A, a lower wall 3C, a front wall 3D, a first side wall 4 and a second side wall 5, and an upper wall 3B, a first side wall 4, a lower wall 3C, The second side wall 5 constitutes the peripheral wall of the main body 3. As shown in FIG. 2, the shock absorber 10 of this embodiment has a shape in which the distance between the upper wall 3B and the lower wall 3C is longer than the distance between the first side wall 4 and the second side wall 5. It consists of.

  The shaft portion 11 is formed in a truncated cone shape, and as shown in FIG. 12, the shaft portion 11 is inserted into the shaft hole 21 corresponding to the shaft portion 11 provided in the attachment object 20, and the shaft portion 11 is rotated. As shown in FIG. 13, the main body 3 is configured to rotate with respect to the attachment object 20 as an axis. The shaft portion 11 is not limited to the truncated cone shape, and can be configured in an arbitrary shape such as a cylindrical shape as long as the main body 3 can be rotated around the shaft portion 11 as an axis. It is.

  Further, the drop prevention portions 12 and 13 are formed in a key shape with bent tip portions, and as shown in FIG. 12, mounting holes 22 and 23 corresponding to the drop prevention portions 12 and 13 provided in the attachment object 20. When the main body 3 is rotated with respect to the mounting object 20 with the shaft portion 11 as a rotation shaft, the slip prevention portions 12 and 13 are provided at the tips of the slip prevention portions 12 and 13 as shown in FIG. Of the restriction portions 12b, 13b provided on the tips of the removal prevention portions 12, 13 and moved so as to sandwich the object 20 between the bottom surface of the restriction portions 12b, 13b and the surface of the main body 3. A part is overlapped with the attachment object 20, and the removal preventing portions 12 and 13 are restricted so as not to be removed from the attachment holes 22 and 23. Thereby, the shock absorber 10 can be attached to the automobile. However, when the shock absorber 10 of the present embodiment is attached to an automobile, it is necessary to attach the attachment object 20 to the automobile parts in advance. Thereby, the shock absorber 10 of the present embodiment can be easily attached to the automobile without using a fixture such as a screw or a screw.

  Further, the shock absorber 10 of the present embodiment can attach the shock absorber 10 to the attachment object 20 with the shaft portion 11 and the drop prevention portions 12 and 13 provided on the rear wall 3A. The installation space for attaching 10 to the attachment object 20 can be reduced. For example, when the mounting portion is provided on the peripheral walls 3B, 4, 3C, and 5 other than the rear wall 3A as in the prior art, an extra space is required for the mounting portion, and the installation space also increases. On the other hand, the shock absorber 10 of the present embodiment is provided with mounting portions (shaft portion 11, drop prevention portions 12 and 13) on the rear wall 3A, and the shock absorber 10 is mounted by the mounting portions 11, 12, and 13 Since it is attached to the object 20, the installation space can be reduced and the limited installation space can be used effectively. Moreover, since the shock absorber 10 of this embodiment attaches the shock absorber 10 to the attachment object 20 by the shaft part 11 and the slip-off preventing parts 12 and 13 provided on the rear wall 3A, as shown in FIG. The recessed portion 40 can be formed by indenting a part of the first side wall 4 which is a peripheral wall inward. As a result, the area of the surrounding wall can be reduced, and when the shock absorber 10 is installed in the installation space, it can be prevented from interfering with other vehicle components. There are no particular limitations on the location or shape of the depression 40, and the depression 40 can be arbitrarily formed based on the installation relationship with the installation space and other vehicle components.

  As shown in FIG. 4, the shaft portion 11 of the present embodiment is formed into a hollow shape by blow molding to increase rigidity. The hollow portion 8 formed inside the shaft portion 11 is integrated with the hollow portion 2 formed inside the main body 3, and the hollow portion 2 of the main body 3 and the hollow portion 8 of the shaft portion 11 are integrated. It is configured to allow air to flow in between.

  Further, the shaft hole 21 corresponding to the shaft portion 11 is formed in a shape having the same size as the outer shape of the shaft portion 11, and the shaft portion 11 is rotated by the shaft hole 21. For example, when the shaft portion 11 is configured in a truncated cone shape, the shaft hole 21 is configured in a circular shape.

  In addition, as shown in FIG. 5, the slip-out preventing portions 12 and 13 of the present embodiment are formed in a hollow shape by blow molding to increase rigidity. FIG. 5 shows an example of the configuration of one of the drop prevention portions 13, but the other drop prevention portion 12 is configured in substantially the same manner as the configuration shown in FIG. Further, the hollow part 9 formed inside the drop prevention part 12, 13 is integrated with the hollow part 2 formed inside the main body 3, and the hollow part 2 of the main body 3 and the drop prevention part 12, 13 are integrated. It is configured to allow air to flow into and out of the hollow portion 9.

Further, as shown in FIG. 6, the drop-off prevention portions 12 and 13 include joint portions 12 a and 13 a that are joined to the rear wall 3 </ b> A of the main body 3, and restricting portions 12 b and 13 b that protrude from the tip portions of the joint portions 12 a and 13 a 12 and 13, as shown in FIGS. 12 and 13, when the main body 3 is rotated about the shaft portion 11 as a rotation axis, the main body 3 is positioned on one surface of the attachment object 20, and The parts 12b and 13b are located on the other surface of the attachment object 20, and the joint parts 12a and 13a are located in the attachment holes 22 and 23. As a result, when the main body 3 is rotated about the shaft 11 as a rotating shaft, a part of the restricting portions 12b and 13b overlaps with the attachment object 20, and the removal preventing portions 12 and 13 cannot be removed from the attachment holes 22 and 23. Can be regulated.

  Further, the drop prevention portions 12 and 13 of this embodiment are formed with thin portions (burrs) 12c and 13c between the restricting portions 12b and 13b and the main body 3, and the main body 3 is used with the shaft portion 11 as a rotation shaft. When rotating, the thin parts (burrs) 12c, 13c are deformed by the mounting object 20, and between the regulating parts 12b, 13b and the surface of the mounting object 20, and the back surface of the mounting object 20 and the main body 3 The thin-walled parts (burrs) 12c and 13c are in close contact with each other. Thereby, the attachment target object 20 can be fixed in a state where a part of the restricting portions 12b and 13b overlaps the attachment target object 20.

  Further, when the shock absorber 10 of the present embodiment is molded by blow molding, a thin portion (burr) 12c, between the restriction portions 12b, 13b provided at the tips of the drop prevention portions 12, 13 and the main body 3 is provided. 13c is inevitably formed, but when the main body 3 is rotated about the shaft 11 as the rotation axis, the thin parts (burrs) 12c and 13c can be deformed by the mounting object 20, so that after blow molding The thin portions (burrs) 12c and 13c do not need to be cut off, and post-processing steps after blow molding (finishing steps such as deburring) can be simplified.

  In the shock absorber 10 of the present embodiment, the above-described shaft portion 11 and drop prevention portions 12 and 13 are provided on the parting line PL. Thereby, the strength of the parting line PL of the rear wall 3A can be improved. As a result, when the shock absorber 10 receives an impact, the parting line PL of the rear wall 3A can be prevented from breaking, and the shock absorbing performance can be ensured.

  Further, as shown in FIGS. 4 and 5, the rear wall 3 </ b> A of the present embodiment has a convex portion 30 that protrudes toward an attachment object (not shown). The convex part 30 is on both sides (the first side wall 4 side and the second side wall 5 side) across the parting line PL (where the shaft part 11 and the drop prevention parts 12, 13 are provided) formed on the rear wall 3A. Preferably it is formed. As a result, when the rear wall 3A is attached to an attachment object, both sides (first side walls) of the rear wall 3A rather than the part of the parting line PL (the part where the shaft part 11 and the drop prevention parts 12, 13 are provided). The convex part 30 formed on the 4th side and the second side wall 5 side abuts against the object to be mounted and supports the main body 3, so that the shock absorber 10 is difficult to fall down, and the shock absorber 10 is used as the object to be mounted. On the other hand, it can be stably fixed. Even when the front wall 3D receives an impact, the protrusions 30 formed on both sides (the first side wall 4 side and the second side wall 5 side) of the rear wall 3A facing the front wall 3D are attached to the object to be attached. Due to the contact, the shock absorber 10 can be prevented from falling over or rotating.

  Further, as shown in FIGS. 4 and 5, the shock absorber 10 of the present embodiment has thin portions 31 at the corners connecting the front wall 3D and the side walls (first side wall 4 and second side wall 5). ing. The thickness of the thin wall portion 31 is configured in the range of 30 to 70% of the average wall thickness of the wall portion of the shock absorber 10. The thin portion 31 can be formed by adjusting the curved shape of the corner portion connecting the front wall 3D and the side walls (the first side wall 4 and the second side wall 5). That is, the corner can be thinned by reducing the radius of curvature of the mold for forming the corner.

  Further, as shown in FIG. 3, the shock absorber 10 of the present embodiment has a thin portion 31 at the groove ribs 6 and 7 formed on the first side wall 4 and the second side wall 5. . In this case, the thin-walled portion 31 can be formed by increasing the amount of resin stretch in the portion where the groove-like ribs 6 and 7 are formed. That is, the thin portion 31 can be formed by making the curved shape of the mold for forming the groove-like ribs 6 and 7 abrupt (by reducing the curvature radius).

  As shown in FIGS. 4 and 5, the shock absorber 10 of the present embodiment includes a corner portion that connects the front wall 3D and the side walls (the first side wall 4 and the second side wall 5), and as shown in FIG. Since the thin-walled portion 31 is provided in the groove-shaped ribs 6 and 7 formed on the side walls (the first side wall 4 and the second side wall 5), the thin-walled portion 31 when the shock absorber 10 receives an impact. Will be buckled preferentially. As a result, when receiving an impact, the impact absorber 10 does not rebound, but can start buckling and effectively absorb the impact. Further, even when the load point location (striking point position) that receives an impact on the front wall 3D is deviated from the ideal position, or when the approach angle of the impact entering the front wall 3D is deviated from the ideal approach angle, the thin portion 31 Therefore, the shock absorber 10 can be prevented from falling over and rotating.

  The wall thickness constituting the shock absorber 10 of the present embodiment is configured in the range of 0.7 to 5.0 mm, and the above-described thin wall portion 31 is configured in the range of 30 to 70% of the average wall thickness. It is preferable. Thereby, an impact can be absorbed effectively.

The average wall thickness can be calculated as follows.
For example, the side walls (the first side wall 4 and the second side wall 5) shown in FIG. 3 have three locations (however, groove-like ribs 6 and 7) on the upper end side (upper wall 3B side), the center, and the lower end side (lower wall 3C side). The vertical direction of the straight line connecting the two mold dividing points in the cross section of the section where the front wall 3D and the side wall (the first side wall 4 and the second side wall 5) are not connected to each other) The thickness of the portions (6 places in total) intersecting with the bisector is measured with a caliper, and the average value of the 6 measured values is calculated as the average thickness. Thereby, the average wall thickness of the wall portion constituting the shock absorber 10 can be calculated.

  When attaching the shock absorber 10 of the present embodiment to the attachment object 20, as shown in FIG. 12, the shaft portion 11 is inserted into the shaft hole 21, and the removal preventing portions 12, 13 are attached to the attachment holes 22, 23. insert. Next, as shown in FIG. 13, the main body 3 is rotated by a predetermined angle (for example, 30 °) with respect to the attachment object 20 and provided at the tips of the slip-off prevention portions 12 and 13. A part of the regulated portions 12b and 13b thus overlapped with the attachment object 20. As a result, the shaft 11 and the removal preventing portions 12 and 13 are prevented from coming out of the shaft hole 21 and the mounting holes 22 and 23, and the shock absorber 10 is attached to the attachment object 20 as shown in FIGS. Can be attached. 14-16 has shown the state which attached the shock absorber 10 to the attachment target 20, and FIG. 14 shows the state seen from the 1st side wall 4 side which is a surrounding wall of the shock absorber 10. FIG. 15 shows a state seen from the front wall 3D side, and FIG. 16 is a diagram showing a cross-sectional configuration example taken along the line 16X-16X ′ shown in FIG.

  As shown in FIG. 14, the shock absorber 10 of the present embodiment has a groove-like rib 6 extending from the front wall 3 </ b> D toward the rear wall 3 </ b> A on the first side wall 4, and the groove-like rib 6 extends. The direction α and the vertical direction β perpendicular to the rear wall 3A form a predetermined angle θ. Therefore, the groove-like rib 6 extends in a direction inclined with respect to the vertical direction β perpendicular to the rear wall 3A. Thereby, as shown in FIG. 14, when the rear wall 3A is attached to the attachment object 20, the extending direction α of the groove-like rib 6 can be made the same direction as the impact direction. As a result, when an impact is received at the front wall 3D, the impact can be effectively absorbed by the groove-like ribs 6 while increasing the rigidity against the impact. FIG. 14 shows the extending direction α of the groove-like rib 6 on the first side wall 4 side, but the extending direction α of the groove-like rib 7 on the second side wall 5 side is also the groove shape on the first side wall 4 side. The same as rib 6. FIG. 14 shows a state as viewed from the direction orthogonal to the first side wall 4, and the extending direction α of the groove-like rib 6 is inclined with respect to the vertical direction β perpendicular to the rear wall 3A.

  Further, as shown in FIG. 15, the front wall 3D of the shock absorber 10 of the present embodiment has a parting line PL extending from an upper end (upper wall 3B side) and a lower end (lower wall 3C side). The rigidity of the front wall 3D is increased. For this reason, it is possible to make the front wall 3D difficult to break when an impact is applied to the front wall 3D. Further, in the front wall 3D, the groove-like ribs 6 and 7 are provided so that the distances from the bottoms of the groove-like ribs 6 and 7 to the parting line PL are equal (a1 = a2, b1 = b2, c1). = c2). For this reason, even if the load point location (striking point position) that receives an impact on the front wall 3D deviates from the ideal position, or the impact angle of the impact that enters the front wall 3D deviates from the ideal entry angle, the desired point can be obtained. The load can be stably maintained and a desired amount of shock absorption can be ensured.

  Further, as shown in FIG. 2, the shock absorber 10 of the present embodiment is integrally formed on the rear wall 3A so that the shaft portion 11 and the slip-off preventing portions 12, 13 are in a straight line. Thereby, as shown in FIG. 13, the location which attaches the shock absorber 10 to the attachment target object 20 can be made on a straight line.

  Further, as shown in FIG. 16, the rear wall 3A of the shock absorber 10 of the present embodiment has a convex portion 30 protruding toward the attachment object 20, and the convex portion 30 is formed on the rear wall 3A. Are formed on both sides (the first side wall 4 side and the second side wall 5 side) across the parting line PL (where the shaft portion 11 and the drop prevention portions 12, 13 are provided). As a result, when the rear wall 3A is attached to the attachment object 20, the convex portions 30 formed on both sides (the first side wall 4 side and the second side wall 5 side) of the rear wall 3A abut against the attachment object 20. Since the main body 3 is supported, it is difficult for the shock absorber 10 to fall down, and the shock absorber 10 can be stably fixed to the attachment object 20. Even when the front wall 3D receives an impact, the protrusions 30 formed on both sides (the first side wall 4 side and the second side wall 5 side) of the rear wall 3A come into contact with the mounting object 20, so that the impact is absorbed. The body 10 can be prevented from falling over or rotating.

  In addition, as shown in FIG. 16, the protrusions 30 formed on both sides of the rear wall 3A of this embodiment have both ends (from the parting line PL (where the shaft portion 11 and the drop prevention portions 12, 13 are provided) The protrusion amount is continuously increased as the distance from the first side wall 4 side and the second side wall 5 side increases. However, it is also possible to configure such that the protruding amount partially increases. Note that the amount of protrusion is formed on the shock absorber 10 by the line L1 connecting the part PL (O) where the parting line PL is formed on the rear wall 3A and the vertex H of the part where the convex part 30 is formed. It is preferable that the angle θ4 formed by the mold release direction L2 of the split mold to be in the range of 0 ° to 4 °. When the angle θ4 is 0 °, the protrusion amount is zero. When the protruding amounts at both ends (the first side wall 4 side and the second side wall 5 side) are all 0 across the parting line PL, the convex portions 30 formed on both sides of the rear wall 3A become flat, and the party The surfaces of the rear walls 3A on both sides of the grip line PL are located on the same plane. Also in this case, the rear wall 3A on both sides (the first side wall 4 side and the second side wall 5 side) across the parting line PL abuts on the mounting object 20, thus preventing the shock absorber 10 from falling over and rotating. can do.

  The convex portion 30 formed on the rear wall 3A of the present embodiment can be formed, for example, with the configuration example shown in FIG. FIG. 17A shows a configuration example on the rear wall 3A side, and shows a configuration example in which the convex portion 30 is formed in a partial region of the rear wall 3A. The belt-like convex portion 30 on the 17A-17A ′ line and the belt-like convex portion 30 on the 17C-17C ′ line shown in FIG. It can be configured such that the protruding amount continuously increases as the distance from the first side wall 4 side and the second side wall 5 side increases. Further, the protruding amount from the parting line PL to both ends (the first side wall 4 side and the second side wall 5 side) can be configured to be zero. Further, the projecting amount may be discontinuously changed between the parting line PL and both ends (the first side wall 4 side and the second side wall 5 side). In addition, since the region other than the convex portion 30 is configured so that the protruding amount decreases as it moves away from the parting line PL to both ends (the first side wall 4 side and the second side wall 5 side), as in the past. Even when the protruding amount of the convex part 30 is 0, as a result, it is possible to configure a state in which the convex part 30 at both ends protrudes across the parting line PL.

  Further, the quadrangular convex portions 30 on the line 17B-17B ′ shown in FIG. 17A are formed in a part of the section from the parting line PL to both ends (the first side wall 4 side and the second side wall 5 side). The protruding portion 30 formed in a part of the section has a protruding amount continuously from the parting line PL side toward both ends (the first side wall 4 side and the second side wall 5 side). It can be configured to increase, or can be configured such that the protruding amount is 0 (flat shape) from the parting line PL side to both end sides. The cross-sectional shape of the rear wall 3A on the line 17B-17B ′ shown in FIG. 17 (a) is, for example, as shown in FIG. 17 (b). Can be formed. The convex portion 30 shown in FIG. 17 (b) is a case where the protruding amount is continuously increased from the parting line PL side toward both ends (the first side wall 4 side and the second side wall 5 side). A configuration example is shown.

  In addition, although the convex part 30 shown to Fig.17 (a) decided to form in the one part area | region of 3 A of back walls, it is also possible to form in the all areas | domains of 3 A of back walls. In this case, it is configured such that the protruding amount increases continuously as it moves away from the parting line PL to both ends (the first side wall 4 side and the second side wall 5 side). (The first side wall 4 side and the second side wall 5 side) may be configured such that the protruding amount becomes zero.

  In the case of forming the rear wall 3A having the convex portion 30 for preventing the above-described lateral collapse and rotation, a split mold 200 having a cavity surface 202 as shown in FIG. 18 is used. In the split mold 200 shown in FIG. 18, the cavity surface 202 that forms the rear wall 3A having the convex portion 30 described above has a concave portion 202A2 that is recessed in the orthogonal direction Y perpendicular to the mold drawing direction of the split mold 200. Configure. Thereby, the rear wall 3A having the convex portions 30 shown in FIGS. 16 and 17 can be formed. The recess 202A2 is formed so that the recess amount in the orthogonal direction Y orthogonal to the die-cutting direction of the split mold 200 increases continuously as the distance from the cut-off portion 202A1 forming the parting line PL increases. Even if the surface 202 has the recess 202A2, the shock absorber 10 that is a molded product can be easily removed from the split mold 200.

  In addition, as shown in FIG. 16, the groove-like ribs 6 and 7 of the present embodiment are bent so as to protrude in the direction away from the opposing side walls (first side wall 4 and second side wall 5). Even when the approach angle of the impact entering the wall 3D is different from the ideal approach angle, the impact can be absorbed. The groove-like ribs 6 and 7 shown in FIG. 16 are configured to be bent so as to protrude in the direction away from the opposing first side wall 4 and second side wall 5 (outward direction). The bending angle θ3 of 7 is preferably in the range of 1 to 10 °. When the bending angle θ3 of the groove-like ribs 6 and 7 is less than 1 °, the shock absorber 10 is likely to fall down when the impact angle of the impact entering the front wall 3D is different from the ideal approach angle. If it is more than °, the rigidity will be weak. For this reason, the bending angle θ3 of the groove-like ribs 6 and 7 is preferably in the range of 1 to 10 °. The groove-like ribs 6 and 7 shown in FIG. 16 indicate the first side wall 4 and the second side wall 5 that constitute the bottom of the groove-like ribs 6 and 7.

  The bending angle θ3 of the groove-like ribs 6 and 7 is an angle at which the groove-like ribs 6 and 7 themselves are bent. For example, the bending angle θ3 of the groove-like rib 6 provided on the first side wall 4 side is the groove-like shape. The sum of the angles (θ1, θ2) formed by the first side wall 4 of the portion constituting the bottom of the rib 6 and the first side wall 4 of the portion constituting the flat surface where the groove-like rib 6 is not formed ( θ3 = θ1 + θ2).

  The groove-like rib 6 has a first groove-like rib 6a and a second groove-like rib 6b, and a second connecting groove 6c between the first groove-like rib 6a and the second groove-like rib 6b. A bent portion is formed so as to be convex in a direction away from the side wall 5. The bend angle θ3 of the groove-like rib 6 is the first side wall 4 of the portion constituting the bottom of the first groove-like rib 6a and the first portion of the portion constituting the flat surface where the groove-like rib 6 is not formed. The angle θ1 formed by the side wall 4 and the first side wall 4 of the part constituting the bottom of the second grooved rib 6b and the first part of the part constituting the flat surface where the grooved rib 6 is not formed. An angle θ2 formed by one side wall 4 is formed (θ3 = θ1 + θ2).

  Further, the bending angle θ3 of the grooved rib 7 provided on the second side wall 5 side is the same as the bending angle θ3 of the grooved rib 6 described above, and the second side wall 5 of the portion constituting the bottom of the grooved rib 7; This is the sum (θ3 = θ1 + θ2) of the angles (θ1, θ2) formed by the second side wall 5 of the portion constituting the flat surface where the groove-like rib 7 is not formed.

  The groove-like rib 7 has a first groove-like rib 7a and a second groove-like rib 7b, and is a connecting portion 7c between the first groove-like rib 7a and the second groove-like rib 7b. A bent portion is formed so as to be convex in a direction away from the side wall 4. The bending angle θ3 of the groove-like rib 7 is the second side wall 5 of the portion constituting the bottom of the first groove-like rib 7a and the second angle of the portion constituting the flat surface where the groove-like rib 7 is not formed. The angle θ1 formed by the side wall 5 and the second side wall 5 of the part constituting the bottom of the second grooved rib 7b and the part of the part constituting the flat surface where the grooved rib 7 is not formed. An angle θ2 formed by two side walls 5 (θ3 = θ1 + θ2).

  Note that the first groove-like rib 6a and the second groove-like rib 6b constituting the groove-like rib 6 of this embodiment are plane-symmetric with respect to the surface constituted by the connecting portion 6c. Similarly, the first groove-like rib 7a and the second groove-like rib 7b constituting the groove-like rib 7 are plane-symmetric with respect to the surface constituted by the connecting portion 7c. Therefore, θ1 and θ2 shown in FIG. 16 have the same angle (θ1 = θ2).

  Further, the groove-like rib 6 and the groove-like rib 7 are planes (first side wall 4 and second side wall) formed by a region at the midpoint between the bottom of the groove-like rib 6 and the bottom of the groove-like rib 7. The plane is parallel to 5). For this reason, when an impact is received at the front wall 3D, the groove-like ribs 6 and 7 are uniformly buckled, and the impact can be absorbed uniformly.

  In addition, although the groove-like ribs 6 and 7 shown in FIG. 16 are configured to be bent so as to protrude in the direction away from the opposing first side wall 4 and second side wall 5 (outward direction), they face each other. It is also possible to configure the first side wall 4 and the second side wall 5 to be bent so as to protrude in the direction (inward direction). Further, the groove-like ribs 6 and 7 shown in FIG. 16 have a depth h2 of the groove-like ribs 6 and 7 on the rear wall 3A side and a front wall 3D side rather than the depth h1 of the groove-like ribs 6 and 7 near the center. The groove-shaped ribs 6 and 7 are configured to have a deep depth h3 (h1 <h2 and h1 <h3). However, as shown in FIG. 19, the depth of the groove-like ribs 6 and 7 from the front wall 3D to the vicinity of the center is set to the same depth h1, and the depth h2 of the groove-like ribs 6 and 7 on the rear wall 3A side is deepened. It is also possible to configure in such a shape (h1 <h2). Note that the bending angle θ3 of the groove-like ribs 6 and 7 shown in FIG. 19 is such that the side walls 4 and 5 constituting the bottom of the first groove-like ribs 6a and 7a and the groove-like ribs 6 and 7 are formed. However, the angle θ1 is formed by the side walls 4 and 5 of the portion constituting the flat surface.

  In this way, if the groove-like ribs 6 and 7 provided on the first side wall 4 and the second side wall 5 that are the peripheral walls connecting the front wall 3D and the rear wall 3A are bent, at the bent portion. The shock can be effectively absorbed. In addition, although the groove-like ribs 6 and 7 shown in FIGS. 16 and 19 show the configuration example bent near the center of the rear wall 3A and the front wall 3D, the bent portion is limited to the vicinity of the center. It is also possible to have a configuration example that is bent at an arbitrary location.

  Further, in the shock absorber 10 of the present embodiment, the shaft portion 11 is provided in the center of the rear wall 3A, and the drop prevention portions 12 and 13 are provided on both sides of the shaft portion 11. By providing the shaft portion 11 at the center of the rear wall 3A, the radius of rotation of the main body 3 can be reduced, and the space required for the mounting operation of the shock absorber 10 can be reduced. For example, when the shaft portion 11 is provided in the vicinity of one end portion of the rear wall 3A and at least one slip-off preventing portion 12 is provided in the vicinity of the other end portion of the rear wall 3A, the main body 3 with the shaft portion 11 as a rotation shaft. , And the removal preventing portion 12 is fitted into the attachment hole 22 corresponding to the removal preventing portion 12, so that the turning radius of the main body 3 is increased. On the other hand, when the shaft portion 11 is provided near the center of the rear wall 3A and the slip prevention portions 12 and 13 are provided near both ends of the rear wall 3A, the main body 3 is rotated around the shaft portion 11 as a rotating shaft, Since the prevention portions 12 and 13 are fitted into the mounting holes 22 and 23 corresponding to the removal prevention portions 12 and 13, the turning radius of the main body 3 can be reduced. Therefore, the rotation radius of the main body 3 can be reduced by providing the shaft portion 11 in the center of the rear wall 3A and providing the drop prevention portions 12 and 13 on both sides of the shaft portion 11. Further, by providing the drop prevention parts 12 and 13 on both sides of the shaft part 11, the rotation of the main body 3 can be easily regulated.

  Moreover, as shown in FIGS. 12 and 13, the shock absorber 10 of the present embodiment has two drop prevention portions 12 and 13, and the distance between the first drop prevention portion 12 and the shaft portion 11. The distance r1 is different from the distance r2 between the second drop prevention part 13 and the shaft part 11. Note that the mounting holes 22 and 23 provided in the mounting object 20 are also configured in accordance with the removal preventing portions 12 and 13. As a result, it is possible to prevent erroneous insertion of the removal preventing portions 12 and 13. In the present embodiment, since the two drop prevention parts 12 and 13 are configured in the same shape, the distances r1 and r2 between the shaft part 11 are made different. However, it is also possible to configure the two drop prevention portions 12 and 13 with different shapes to prevent erroneous insertion of the drop prevention portions 12 and 13.

  As shown in FIG. 11, the shock absorber 10 described above is configured so that the grooved rib 6 provided on the first side wall 4 side and the grooved rib 7 provided on the second side wall 5 side face each other at the same position. It is composed. However, as shown in FIG. 20, the groove-like ribs 6 provided on the first side wall 4 side and the groove-like ribs 7 provided on the second side wall 5 side may be alternately opposed. Even in this configuration, the groove-like ribs 6 and 7 are preferably provided so that the distances from the bottoms of the groove-like ribs 6 and 7 to the parting line PL are equal (a1 = a2, b1 = b2). , c1 = c2). This makes it possible to stabilize the desired load even when the impact location (spot location) on the front wall 3D deviates from the ideal position, or the impact angle of impact entering the front wall 3D differs from the ideal approach angle. Therefore, a desired shock absorption amount can be ensured. The distance from the bottom of the groove-like ribs 6 and 7 to the parting line PL is a value measured in a state where the line connecting the bottom of the groove-like ribs 6 and 7 and the parting line PL is orthogonal to the parting line PL. It is.

  Further, as shown in FIG. 2, the shock absorber 10 described above has a shaft portion 11 and slip-off preventing portions 12 and 13 on the rear wall 3A, and the shaft portion 11 is formed in the shaft hole 21 as shown in FIG. At the same time of insertion, the drop prevention parts 12 and 13 are inserted into the mounting holes 22 and 23, respectively. Then, as shown in FIG. 13, the main body 3 is rotated with respect to the attachment object 20 with the shaft portion 11 as the rotation axis, and a part of the restriction portions 12b and 13b of the drop prevention portions 12 and 13 is attached to the attachment object 20. The shock absorber 10 is attached to the attachment object 20 by overlapping with the attachment object 20. However, at least one drop prevention part 12, 13 is sufficient, and the shock absorber 10 can be attached to the attachment object 20 even with the configuration of the shaft part 11 and one drop prevention part 12.

  Further, in the shock absorber 10 described above, the shaft portion 11 is inserted into the shaft hole 21 that penetrates. However, the shaft hole 21 does not need to penetrate, and any shape of the shaft hole 21 can be provided as long as the shaft portion 11 can rotate stably. Further, it is also possible to rotate the shaft portion 11 by bringing the shaft portion 11 into contact with the mounting object 20 without providing the shaft hole 21 in the mounting object 20. In addition, without providing the shaft portion 11 on the rear wall 3A, only the two drop prevention portions 12 and 13 are provided on the rear wall 3A, and the two drop prevention portions 12 and 13 are inserted into the mounting holes 22 and 23, and are removed. By moving the prevention parts 12 and 13 within the region of the mounting holes 22 and 23, the main body 3 is rotated, and part of the restriction parts 12b and 13b of the removal prevention parts 12 and 13 overlaps the attachment object 20. It is also possible to attach the shock absorber 10 to the attachment object 20.

  Further, in the shock absorber 10 described above, the shaft portion 11 is provided on the rear wall 3A side, and the shaft hole 21 is provided on the attachment object 20 side. However, it is also possible to provide the shaft hole 21 on the rear wall 3A side and the shaft portion 11 on the attachment object 20 side.

  Further, as shown in FIG. 21, the shock absorber 10 of the present embodiment includes at least one of a locking portion 14 protruding from the rear wall 3 </ b> A and a locking portion 15 protruding from the removal preventing portions 12 and 13. As shown in FIG. 22, the locking portions 14 and 15 have locking portions 14 and 15 provided on the attachment object 20 by rotating the main body 3. It is also possible to configure so that the rotation of the main body 3 in the reverse direction is restricted by locking in the holes 24 and 25. The locking hole 24 is a hole corresponding to the locking portion 14 protruding from the rear wall 3A, and the locking hole 25 is a hole corresponding to the locking portion 15 protruding from the drop prevention portions 12 and 13.

  The locking portions 14 and 15 are formed in a hollow shape by blow molding so as to increase the rigidity. Further, the hollow portion formed inside the locking portion 14 protruding from the rear wall 3A is integrated with the hollow portion 2 formed inside the main body 3, and the hollow portion 2 and the locking portion of the main body 3 are integrated. It is configured so that air can flow in between the 14 hollow portions. Further, the hollow part formed inside the locking part 15 protruding from the drop prevention part 12, 13 is integrated with the hollow part 9 formed inside the drop prevention part 12, 13. Air is allowed to flow in between the hollow portions 9 of 12 and 13 and the hollow portion of the locking portion 15.

  The shapes of the locking portions 14 and 15 and the locking holes 24 and 25 are such that the locking portions 14 and 15 are inserted into the locking holes 24 and 25 and the locking portions 14 and 15 are inserted into the locking holes 24 and 25. Any configuration example can be applied as long as it can be locked and the rotation of the main body 3 in the reverse direction can be restricted. For example, a triangular shape or an arc shape can be used. However, in consideration of restricting the rotation of the main body 3 in the reverse direction, the portions where the locking portions 14 and 15 abut on the locking holes 24 and 25 are configured to contact the locking holes 24 and 25 on the surface. It is preferable.

  Further, as shown in FIGS. 23 and 24, the shock absorber 10 of the present embodiment leaves the compression portion CP in the part of the parting line PL passing through the upper wall 3B and the lower wall 3C, and the upper wall 3B. Improve the welding strength with the lower wall 3C. In addition, it is preferable that the part of the parting line PL that passes through the front wall 3D that receives the impact and the rear wall 3A that is attached to the attachment object 20 is flat. As a result, it is possible to prevent cracking from the parting line PL and perform stable shock absorption. FIG. 23 is a perspective view of the shock absorber 10 viewed from the rear wall 3A side, and FIG. 24 is a perspective view of the shock absorber 10 viewed from the front wall 3D side.

  In addition, as shown in FIG. 24, the shock absorber 10 of the present embodiment can form a recess 40 by recessing a part of the first side wall 4 that is a peripheral wall inward. As a result, the area of the surrounding wall can be reduced, and when the shock absorber 10 is installed in the installation space, it can be prevented from interfering with other vehicle components.

  FIG. 25 is a graph showing test results obtained by applying the blow-molded shock absorbers of the example and comparative example shown in FIG. 26 to a collision tester. The test results in FIG. 25 show that the shock absorbers of the example and the comparative example were shocked from an ideal position (α1, β1) and were shocked from a position shifted from the ideal position ( The test results for (α2, β2) and when impacted at an approach angle different from the ideal approach angle (α3, β3) are shown.

  The dimensions of the shock absorber of the comparative example shown in FIG. 26 (a) are 120 mm × 50 mm for the front wall 3D, 80 mm × 50 mm for the upper wall 3B, 90 mm × 50 mm for the rear wall 3A, and 70 mm × 50 mm for the lower wall 3C. . For this reason, the first side wall 4 and the second side wall 5 are 80 mm on the upper wall 3B side, 70 mm on the lower wall 3C side, 90 mm on the rear wall 3A side, and 120 mm on the front wall 3D side. Moreover, the average thickness of the wall portion of the shock absorber is 1.30 mm, and the thickness of the thin portion 31 formed at the corner portion connecting the front wall 3D and the surrounding walls 4, 5, 3B, 3C is 0.96 mm. It was. In addition, the groove-like ribs 6 and 7 are linear. Further, the rear wall 3A is configured such that the position of the parting line PL protrudes closer to the attachment object 20 than the positions of both side ends (the first side wall 4 side and the second side wall 5 side).

  The dimensions of the shock absorber of the example shown in FIG. 26 (b) are the same as those of the comparative example, the average wall thickness of the shock absorber is 1.48 mm, the front wall 3D and the surrounding walls 4, 5, The thickness of the thin portion 31 formed at the corner connecting 3B and 3C was 0.48 mm. The groove-like ribs 6 and 7 are bent. Further, the rear wall 3A is configured such that the positions of both side ends (the first side wall 4 side and the second side wall 5 side) protrude toward the attachment object 20 side with respect to the position of the parting line PL.

  The shock absorber of the embodiment shown in FIG. 26 (b) has the shock absorbing performance obtained when receiving an impact from an ideal position (β1), and the shock absorber of the comparative example shown in FIG. 26 (a). In order to be the same, the shape of the rear wall 3A, the shape of the groove-like ribs 6 and 7, and the thickness of the thin portion 31 were made different.

The material constituting the shock absorber was polypropylene “AD571” (flexural modulus 1050 MPa) manufactured by Sumitomo Mitsui Chemicals.
The collision tester was a collision tester manufactured by Hodogaya Giken Co., Ltd. A columnar collider having a mass of 20 kg, a tip shape of φ75 mm, and a length of 160 mm was collided at a speed of 19 km / hour.

  As is clear from the test results shown in FIG. 25, when the target load is 5 KN from the viewpoint of preventing the passenger from being damaged, in the case of the shock absorber of the comparative example, the impact is shifted from the position shifted from the ideal position. It was found that the amount of shock absorption was small when receiving (α2) and when receiving an impact at an approach angle different from the ideal approach angle (α3).

  On the other hand, in the case of the shock absorber of the embodiment, when receiving an impact from a position deviating from the ideal position (β2), and when receiving an impact at an approach angle different from the ideal approach angle (β3) ), The shock absorption amount did not change, and it was found that a stable shock absorption amount could be secured. The shock absorption amount is the area of the portion surrounded by the curve below the curve and the horizontal axis (however, excluding the range exceeding the target load).

  Therefore, like the shock absorber of the embodiment shown in FIG. 26 (b), the thin wall portion 31 is formed at the corner portion connecting the front wall 3D and the surrounding walls 4, 5, 3B, 3C, and the groove-like ribs 6, 7 is bent, and the rear wall 3A is configured such that the positions of both side ends (the first side wall 4 side and the second side wall 5 side) protrude toward the attachment object 20 side rather than the position of the parting line PL. Therefore, even when an impact is received from a position that deviates from the ideal position, or even when an impact is received at an approach angle different from the ideal approach angle, a stable impact absorption amount is ensured and the desired impact is achieved. Absorption performance can be demonstrated.

<Operation / Effect of Shock Absorber 10 of this Embodiment>
Thus, as shown in FIG. 2, the shock absorber 10 of this embodiment is connected to one end (upper wall 3B side) and the other end (lower wall 3C side) of the rear wall 3A attached to the attachment object 20. The parting line PL is formed to extend, and as shown in FIG. 16, the rear wall 3 </ b> A has a protrusion 30 protruding toward the attachment object 20. As a result, the shock absorber 10 of the present embodiment makes it difficult for the shock absorber 10 to fall down because the convex portion 30 abuts against the attachment object 20 when the shock absorber 10 receives an impact.

  Further, the shock absorber 10 of the present embodiment is configured such that the surfaces of the rear walls 3A on both sides of the parting line PL are located on the same plane. Thereby, when the shock absorber 10 receives an impact, the surfaces of the rear walls 3A on both sides abut against the attachment object 20 across the parting line PL, so that the shock absorber 10 can be prevented from falling down. .

  In the embodiment described above, the drop prevention portions 12 and 13 of the shock absorber 10 are inserted into the attachment holes 22 and 23 provided in the attachment object 20. However, it is also possible to form the configuration of the mounting object 20 in advance with respect to the parts of the automobile and to directly attach the shock absorber 10 to the parts (attachment object) of the automobile. For example, the attachment holes 22 and 23 may be formed in advance for the parts of the automobile, and the drop prevention portions 12 and 13 of the shock absorber 10 may be directly attached to the automobile parts (attachment objects).

(Second Embodiment)
Next, a second embodiment will be described.

  The first embodiment has described the shock absorber 10 suitable for a knee bolster.

  In the second embodiment, a shock absorber 10 suitable for a bumper absorber will be described.

<Configuration example of shock absorber 10>
First, a configuration example of the shock absorber 10 of the present embodiment will be described with reference to FIGS. FIG. 27 is a diagram illustrating an example of the overall configuration of the shock absorber 10 of the present embodiment and the attachment object 20 to which the shock absorber 10 is attached. FIG. 28 is a diagram of the shock absorber 10 shown in FIG. An example of a cross-sectional configuration taken along line 28X-28X ′ is shown, and FIG. 29 shows an example of a cross-sectional configuration taken along line 29X-29X ′ of the shock absorber 10 shown in FIG. 30 shows a configuration example on the upper wall 3B side of the shock absorber 10 shown in FIG. 27, and FIG. 31 shows a configuration example on the lower wall 3C side of the shock absorber 10 shown in FIG. FIG. 32 shows a configuration example on the A side (rear wall 3A side) of the shock absorber 10 shown in FIG. 27, and FIG. 33 shows a configuration on the D side (front wall 3D side) of the shock absorber 10 shown in FIG. It is a figure which shows an example.

  The shock absorber 10 of the present embodiment is formed by blow molding a thermoplastic resin into a hollow shape. As shown in FIG. 28, the upper wall 3B and the lower wall 3B of the main body 3 having the hollow portion 2 are opposed to each other. A plurality of groove-like ribs 6 and 7 formed by recessing the wall 3C toward the other are provided. As shown in FIG. 27, the groove-like ribs 6 and 7 formed on the upper wall 3B and the lower wall 3C extend from the front wall 3D toward the rear wall 3A, and the extending direction thereof is the same direction as the impact direction. Preferably there is. Thereby, the rigidity with respect to the impact from an impact direction can be improved.

  The shock absorber 10 of the present embodiment receives an impact on the front wall 3D shown in FIG. 33, and the impact received on the front wall 3D is attached via the rear wall 3A shown in FIG. 32 facing the front wall 3D. I try to tell things 20. In the shock absorber 10 of the present embodiment, a parting line PL extends from the first side wall 4, the front wall 3D, the second side wall 5, and the rear wall 3A, thereby increasing the rigidity of the shock absorber 10. Thereby, when an impact is received at the front wall 3D, the shock absorber 10 can be made difficult to break.

  Further, as shown in FIG. 33, the front wall 3D has a parting line PL extending to both side ends (the first side wall 4 side and the second side wall 5 side), thereby increasing the rigidity of the front wall 3D. . Thereby, when the front wall 3D receives an impact, the front wall 3D can be made difficult to break.

  In the front wall 3D, the groove-like ribs 6 and 7 are provided so that the distances from the bottoms of the groove-like ribs 6 and 7 to the parting line PL are equal. In the front wall 3D, the distance from the bottom of the grooved rib 6 provided on the upper wall 3B to the parting line PL, and the distance from the bottom of the grooved rib 7 provided on the lower wall 3C to the parting line PL , The thickness of the groove-like ribs 6 and 7 can be made constant. For this reason, even if the load point location (striking point position) that receives an impact on the front wall 3D deviates from the ideal position, or the impact angle of the impact that enters the front wall 3D deviates from the ideal entry angle, the desired point can be obtained. The load can be stably maintained and a desired amount of shock absorption can be ensured. The distance from the bottom of the groove-like ribs 6 and 7 to the parting line PL is a value measured in a state where the line connecting the bottom of the groove-like ribs 6 and 7 and the parting line PL is orthogonal to the parting line PL. It is. Further, the shape of the parting line PL is not particularly limited as long as the above-described conditions are satisfied and it extends continuously from both side ends, and can be configured in an arbitrary shape such as a linear shape or a curved shape.

  Further, as shown in FIGS. 30 and 31, groove-like ribs 6 and 7 extending from the front wall 3D toward the rear wall 3A are formed on the upper wall 3B and the lower wall 3C. The groove-like ribs 6 and 7 are configured such that the extending direction α of the groove-like ribs 6 and 7 is the same direction as the impact direction. Thereby, when an impact is received at the front wall 3D, the impact can be effectively absorbed by the groove-like ribs 6 and 7 while increasing the rigidity against the impact. In this embodiment, as shown in FIGS. 30 and 31, the vertically long and horizontally long groove-like ribs 6 and 7 are formed in the extending direction α, but the vertically long and horizontally long groove-like ribs 6 and 7 are formed. However, it is possible to form ribs of any shape in the extending direction α. For example, the circular groove-like ribs 6 and 7 can be formed intermittently in the extending direction α. That is, as long as the rib is formed in the extending direction α, the shape of the rib is not particularly limited, and an arbitrary rib can be formed. However, as shown in FIGS. 30 and 31, it is preferable to form groove-like ribs 6 and 7 continuously connected in the extending direction α. Thus, the groove-like ribs 6 and 7 formed continuously in the extending direction α are moved closer to the upper wall 3B and the lower wall 3C facing each other, or away from the upper wall 3B and the lower wall 3C facing each other. Can be bent so as to be convex.

  As the thermoplastic resin constituting the shock absorber 10 of the present embodiment, a known resin can be applied. For example, it may be composed of a resin having a high mechanical highness such as a polyolefin resin such as polyethylene or polypropylene, a styrene resin such as polystyrene or ABS resin, a polyester resin such as polyethylene terephthalate, polyamide or a mixture thereof. it can.

  In addition, in a range not impairing mechanical strength (impact resistance), for example, fillers such as silica, pigments, dyes, heat stabilizers, light stabilizers, plasticizers, antistatic agents, flame retardants, flame retardants, One type or two or more types of additives used in this field such as anti-aging agent, ultraviolet absorber, antioxidant, anti-fogging agent and lubricant can also be contained.

  As shown in FIG. 32, the shock absorber 10 of this embodiment includes a shaft portion 51 protruding from the rear wall 3A of the main body 3 and an attachment portion 52. The shaft portion 51 and the attachment portion 52 constitute an attachment portion for attaching the shock absorber 10 to the attachment object 20. The main body 3 is composed of six walls, an upper wall 3B, a rear wall 3A, a lower wall 3C, a front wall 3D, a first side wall 4 and a second side wall 5, and an upper wall 3B, a first side wall 4, a lower wall 3C, The second side wall 5 constitutes the peripheral wall of the main body 3.

  As shown in FIG. 27, the shock absorber 10 of the present embodiment has a shape in which the distance between the first side wall 4 and the second side wall 5 is longer than the distance between the upper wall 3B and the lower wall 3C. It consists of.

  The shock absorber 10 of the present embodiment inserts the shaft portion 51 protruding from the rear wall 3A into the shaft hole 61 corresponding to the shaft portion 51 provided on the mounting object 20, and the mounting portion protruding from the rear wall 3A. The main body 3 is attached to the attachment object 20 as shown in FIG. 34 by inserting 52 into an attachment hole 62 corresponding to the attachment portion 52 provided in the attachment object 20. Thereby, the shock absorber 10 can be attached to the automobile. However, when the shock absorber 10 of the present embodiment is attached to an automobile, it is necessary to attach the attachment object 20 to the automobile parts in advance. Thereby, the shock absorber 10 of the present embodiment can be easily attached to the automobile without using a fixture such as a screw or a screw.

  As shown in FIG. 29, the mounting portion 52 of the present embodiment is formed in a hollow shape by blow molding to increase the rigidity. The hollow portion 9 formed inside the mounting portion 52 is integrated with the hollow portion 2 formed inside the main body 3, and the hollow portion 2 of the main body 3 and the hollow portion 9 of the mounting portion 52 are It is configured to allow air to flow in between. The shaft 51 is also formed into a hollow shape by blow molding, similar to the mounting portion 52 described above. The shapes of the attachment portion 52 and the shaft portion 51 of the present embodiment are not particularly limited, and can be configured in an arbitrary shape.

  In the shock absorber 10 of the present embodiment, the above-described shaft portion 51 and mounting portion 52 are provided on the parting line PL. Thereby, the strength of the parting line PL of the rear wall 3A can be improved. As a result, when the shock absorber 10 receives an impact, the parting line PL of the rear wall 3A can be prevented from breaking, and the shock absorbing performance can be ensured.

  In addition, as shown in FIG. 29, the rear wall 3A of the present embodiment has a convex portion 30 protruding toward an attachment object (not shown). The convex portions 30 are preferably formed on both sides with a parting line PL (a portion where the shaft portion 51 and the mounting portion 52 are provided) formed on the rear wall 3A. As a result, when the rear wall 3A is attached to the object to be attached, the upper and lower sides of the rear wall 3A (upper side of the upper wall 3B and lower side) than the part of the parting line PL (the part where the shaft part 51 and the attachment part 52 are provided) Since the convex part 30 formed on the wall 3C side abuts the object to be mounted and supports the main body 3, it is difficult for the shock absorber 10 to fall down, and the shock absorber 10 is stable against the object to be mounted. Can be fixed. Even when the front wall 3D receives an impact, the protrusions 30 formed on the upper and lower sides (the upper wall 3B side and the lower wall 3C side) of the rear wall 3A facing the front wall 3D contact the mounting object 20. Therefore, the shock absorber 10 can be prevented from falling down in the vertical direction.

  In addition, as shown in FIG. 29, the shock absorber 10 of the present embodiment has thin portions 31 at the corners connecting the front wall 3D and the upper and lower walls (upper wall 3B and lower wall 3C). The thickness of the thin wall portion 31 is configured in the range of 30 to 70% of the average wall thickness of the wall portion of the shock absorber 10. The thin portion 31 can be formed by adjusting the curved shape of the corner portion connecting the front wall 3D and the upper and lower walls (upper wall 3B and lower wall 3C). That is, the corner can be thinned by reducing the radius of curvature of the mold for forming the corner.

  In addition, as shown in FIG. 28, the shock absorber 10 of the present embodiment has a thin portion 31 at the groove ribs 6 and 7 formed on the upper wall 3B and the lower wall 3C. In this case, the thin-walled portion 31 can be formed by increasing the amount of resin stretch in the portion where the groove-like ribs 6 and 7 are formed. That is, the thin portion 31 can be formed by making the curved shape of the mold for forming the groove-like ribs 6 and 7 abrupt (by reducing the curvature radius).

  As shown in FIG. 29, the shock absorber 10 of the present embodiment includes corners connecting the front wall 3D and the upper and lower walls (upper wall 3B and lower wall 3C), and upper and lower walls (upper Since the thin-walled portion 31 is formed in the groove-shaped ribs 6 and 7 formed on the wall 3B and the lower wall 3C), the location of the thin-walled portion 31 is preferential when the shock absorber 10 receives an impact. Will be buckled. As a result, when receiving an impact, the impact absorber 10 does not rebound, but can start buckling and effectively absorb the impact. Further, even when the load point location (striking point position) that receives an impact on the front wall 3D is deviated from the ideal position, or when the approach angle of the impact entering the front wall 3D is deviated from the ideal approach angle, the thin portion 31 Therefore, the shock absorber 10 can be prevented from falling down in the vertical direction.

  The average thickness of the wall portion constituting the shock absorber 10 of the present embodiment may be configured in the range of 0.3 to 6.0 mm, and the thin wall portion 31 may be configured in the range of 30 to 70% of the average thickness. preferable. Thereby, an impact can be absorbed effectively.

The average wall thickness can be calculated as follows.
For example, the upper and lower walls (upper wall 3B and lower wall 3C) shown in FIG. 28 have three locations (one groove side 6) on one end side (first side wall 4 side), the center, and the other end side (second side wall 5 side). , 7 and a straight line connecting two mold dividing points in the cross section of the front wall 3D and the upper and lower walls (not corners connecting the upper wall 3B and the lower wall 3C) The thickness of the portion (total of 6 locations) that intersects the perpendicular bisector is measured with a caliper, and the average value of the 6 measured values is calculated as the average thickness. Thereby, the average wall thickness of the wall portion constituting the shock absorber 10 can be calculated.

  When attaching the shock absorber 10 of this embodiment to the attachment object 20, the shaft portion 51 is inserted into the attachment shaft hole 61 and the attachment portion 52 is inserted into the attachment hole 62. Thereby, as shown in FIGS. 34 and 35, the shock absorber 10 can be attached to the attachment object 20. 34 and 35 show a state where the shock absorber 10 is attached to the attachment object 20, FIG. 34 shows a state seen from the front wall 3D side, and FIG. 35 is shown in FIG. It is a figure which shows the example of a cross-section structure of a 35X-35X 'line.

  As shown in FIG. 34, the shock absorber 10 of this embodiment has groove-like ribs 6 and 7 extending from the front wall 3D toward the rear wall 3A on the upper and lower walls (upper wall 3B and lower wall 3C). The extending direction α of the groove-like ribs 6 and 7 is the same as the impact direction. As a result, when an impact is received at the front wall 3D, the impact can be effectively absorbed by the groove-like ribs 6 and 7 while increasing the rigidity against the impact. FIG. 34 shows the extending direction α of the groove-like rib 6 on the upper wall 3B side, but the extension direction α of the groove-like rib 7 on the lower wall 3C side is similar to the groove-like rib 6 on the upper wall 3B side. It is the same.

  Further, as shown in FIG. 34, the front wall 3D constituting the shock absorber 10 of the present embodiment has a parting line PL extending from the first side wall 4 side and the second side wall 5 side. The rigidity of wall 3D is increased. For this reason, it is possible to make the front wall 3D difficult to break when an impact is applied to the front wall 3D. In the front wall 3D, the groove-like ribs 6 and 7 are provided so that the distances from the bottoms of the groove-like ribs 6 and 7 to the parting line PL are equal. For this reason, even if the load point location (striking point position) that receives an impact on the front wall 3D deviates from the ideal position, or the impact angle of the impact that enters the front wall 3D deviates from the ideal entry angle, the desired point can be obtained. The load can be stably maintained and a desired amount of shock absorption can be ensured.

  Further, as shown in FIG. 35, the rear wall 3A of the shock absorber 10 of the present embodiment has a convex portion 30 protruding toward the attachment object 20, and the convex portion 30 is formed on the rear wall 3A. Are formed on the upper and lower sides (upper wall 3B side and lower wall 3C side) with a parting line PL (where the shaft portion 51 and the mounting portion 52 are provided) interposed therebetween. Thus, when the rear wall 3A is attached to the attachment object 20, the convex portions 30 formed on the upper and lower sides (the upper wall 3B side and the lower wall 3C side) of the rear wall 3A abut against the attachment object 20, and the main body Therefore, the shock absorber 10 can be prevented from falling down, and the shock absorber 10 can be stably fixed to the attachment object 20. Even when the front wall 3D receives an impact, since the convex portions 30 formed on the upper and lower sides (the upper wall 3B side and the lower wall 3C side) of the rear wall 3A abut against the mounting object 20, the shock absorber 10 Can be prevented from falling down in the vertical direction.

  Note that the convex portions 30 formed above and below the rear wall 3A of the present embodiment are vertically (upper wall 3B) from the parting line PL (where the shaft portion 51 and the mounting portion 52 are provided), as shown in FIG. Side and lower wall 3C side), the amount of protrusion increases continuously. However, it is also possible to configure such that the protruding amount partially increases. Note that the amount of protrusion is formed on the shock absorber 10 by the line L1 connecting the part PL (O) where the parting line PL is formed on the rear wall 3A and the vertex H of the part where the convex part 30 is formed. It is preferable that the angle θ4 formed by the mold release direction L2 of the split mold to be in the range of 0 ° to 4 °. When the angle θ4 is 0 °, the protrusion amount is zero. When the protruding amounts at both ends across the parting line PL are all 0, the protrusions 30 formed above and below the rear wall 3A are flat, and the surface of the upper and lower rear walls 3A across the parting line PL Are located on the same plane. Also in this case, since the upper and lower rear walls 3A are in contact with the attachment object 20 across the parting line PL, the shock absorber 10 can be prevented from falling in the vertical direction.

  Further, as shown in FIG. 35, the groove-like rib 6 of the present embodiment is bent so as to protrude in a direction away from the opposing walls (upper wall 3B, lower wall 3C) and enters the front wall 3D. The impact can be absorbed even when the approach angle of the impact is different from the ideal approach angle. The bending angle θ3 of the groove-like rib 6 is preferably in the range of 1 to 10 °.

  In addition, although the groove-like rib 6 shown in FIG. 35 is configured to be bent in a direction away from the opposing lower wall 3C (outward direction), it is bent in a direction approaching the opposing lower wall 3C (inward direction). It is also possible to configure the shape. Further, the groove-like rib 6 shown in FIG. 35 has a depth h2 of the groove-like rib 6 on the rear wall 3A side and a groove-like rib 6 on the front wall 3D side rather than the depth h1 of the groove-like rib 6 near the center. The depth h3 is configured to be deeper (h1 <h2 and h1 <h3). However, it is also possible to configure the groove rib 6 from the front wall 3D to the center to have the same depth h1, and the groove wall 6 on the rear wall 3A side to have a deeper depth h2. Yes (h1 <h2). As described above, if the groove-like rib 6 provided on the upper wall 3B that is the peripheral wall connecting the front wall 3D and the rear wall 3A is bent, it is possible to effectively absorb an impact at the bent portion. . In addition, although the groove-like rib 6 shown in FIG. 35 shows a configuration example that is bent near the center of the rear wall 3A and the front wall 3D, the bent portion is not limited to the vicinity of the center, and an arbitrary portion. It is also possible to have a configuration example bent at a. The groove-like ribs 7 provided on the lower wall 3C side are also bent and configured in the same manner as the groove-like ribs 6 provided on the upper wall 3B side described above.

  In addition, as shown in FIG. 27, the shock absorber 10 described above is configured such that the groove-like rib 6 provided on the upper wall 3B side and the groove-like rib 7 provided on the lower wall 3C side are at different positions. However, the groove-like rib 6 provided on the upper wall 3B side and the groove-like rib 7 provided on the lower wall 3C side may be configured to face each other at the same position. Even in this configuration, the groove-like ribs 6 and 7 are preferably provided so that the distances from the bottoms of the groove-like ribs 6 and 7 to the parting line PL are equal. This makes it possible to stabilize the desired load even when the impact location (spot location) on the front wall 3D deviates from the ideal position, or the impact angle of impact entering the front wall 3D differs from the ideal approach angle. Therefore, a desired shock absorption amount can be ensured.

<Operation / Effect of Shock Absorber 10 of this Embodiment>
Thus, as shown in FIG. 35, the shock absorber 10 of the present embodiment is formed by extending the parting line PL so as to be connected to one end and the other end of the rear wall 3A attached to the attachment object 20. The rear wall 3A has a convex portion 30 protruding toward the attachment object 20. As a result, the shock absorber 10 of the present embodiment makes it difficult for the shock absorber 10 to fall down because the convex portion 30 abuts against the attachment object 20 when the shock absorber 10 receives an impact.

  Further, the shock absorber 10 of the present embodiment is configured such that the surfaces of the upper and lower rear walls 3A are located on the same plane with the parting line PL interposed therebetween. Thereby, when the shock absorber 10 receives an impact, the surfaces of the upper and lower rear walls 3A abut against the mounting object 20 across the parting line PL, so that the shock absorber 10 can be prevented from falling down. .

  In the embodiment described above, the attachment portion 52 of the shock absorber 10 is inserted into the attachment hole 62 provided in the attachment object 20. However, it is also possible to form the configuration of the mounting object 20 in advance with respect to the parts of the automobile and to directly attach the shock absorber 10 to the parts (attachment object) of the automobile. For example, the mounting hole 62 may be formed in advance for a vehicle part, and the mounting portion 52 of the shock absorber 10 may be directly attached to the vehicle part (attachment target).

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible.

10 Shock absorber 2, 8, 9 Hollow part 3 Body 3A Rear wall 3B Upper wall (surrounding wall)
3C Lower wall (surrounding wall)
3D front wall 4 1st side wall (surrounding wall)
5 Second side wall (surrounding wall)
6, 7 Groove-shaped rib PL Parting line CP Compression part 11, 51 Shaft part 12, 13 Drop prevention part 12a, 13a Joint part 12b, 13b Tip part 12c, 13c Thin part (burr)
14, 15 Locking part 20 Attachment object 21, 61 Shaft hole 22, 23, 62 Mounting hole 24, 25 Locking hole 30 Convex part 31 Thin part 52 Mounting part 100 Automobile

Claims (2)

A mounting wall to be mounted on the mounting object; and a front wall facing the mounting wall;
A parting line is formed extending to the mounting wall and the front wall ,
The said mounting wall, at a position different from that of the parting line, have a projected portion that projects toward the attachment object,
The convex portions are formed on both sides across the parting line,
The shock absorber according to claim 1, wherein a length of the mounting wall in a short direction is shorter than a maximum distance from the mounting wall to the front wall . The convex portion, the parting continuously protruding amount with distance from the line is formed so as to increase the shock absorbing body according to claim 1 Symbol mounting, characterized in that.

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