JP6610344B2 - Shock absorber - Google Patents

Description

  The present invention relates to a shock absorber.

  The shock absorber according to the present invention has a function of absorbing a shock to a vehicle occupant at the time of a collision or the like by being installed in a vehicle constituent member. In Patent Document 1, a concave rib with open side surfaces formed on an impact absorber is crushed in a direction perpendicular to the stress caused by the impact, and a desired reaction force is generated so as not to be bent into a square shape. Further, a vehicle shock absorber is disclosed in which a desired shock absorption amount can be obtained without a decrease in compression load when the compression strain is in the range of 20 to 80%.

JP 2006-96308 A

  The present invention provides a shock absorber that exhibits fracture behavior in line with design intent.

  According to the present invention, there is provided a shock absorber comprising a hollow molded body having a hollow portion, a load input surface to which a load is input, a facing surface that is spaced apart from the load input surface, and the load input surface. And a connecting surface that connects the opposing surfaces, and the connecting surface includes first and second opposing surface groove ribs formed by recessing the opposing surface toward the load input surface, and the load. First and second load input surface groove ribs are formed so that the input surface is recessed toward the facing surface, and the distal ends of the first facing surface groove rib and the first load input surface groove rib are welded together. A first welded portion, a second welded portion in which the tip portions of the second opposed surface groove rib and the second load input surface groove rib are welded to each other, and the thickness of the thinnest portion of the second welded portion is provided. An impact absorber is provided that is thinner than the thickness of the thinnest portion of the first weld.

  The shock absorber according to the present invention is configured so that the thicknesses of the welded portions provided in the two groove ribs are different. As a result, when a load is input to the shock absorber, the thinner welded portion is first destroyed, and the portion absorbs the shock by being deformed in a “<" shape. Then, the groove rib provided with the thicker welded portion absorbs the impact by the “jabala” deformation, so that it is possible to suitably protect the occupant. In other words, the thinner welded portion is for inducing fracture of the groove rib, and the thicker welded portion is for improving the rigidity. With such a configuration, it is possible to provide an impact absorber that exhibits the fracture behavior in accordance with the design intention by coexisting the "K" shape deformation and the "Jabara" deformation. Note that the “character shape” deformation and the “jabala” deformation will be described later.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the first and second welded portions are provided on the same plane included in the connection surface.
Preferably, the depths of the first facing surface groove rib and the first load input surface groove rib are deeper than the depths of the second facing surface groove rib and the second load input surface groove rib.
Preferably, the ratio of the thickness of the thinnest part of the first welded part to the thickness of the thinnest part of the second welded part is 1.5 or more.
Preferably, the hollow forming body is a blow molded body having a parting line, and the first and second welded portions are formed on the parting line.
Preferably, a rib is formed on the opposed surface or the load input surface, and the first opposed surface groove rib or the first load input surface groove rib communicates with the rib.

It is the front perspective view seen from the right side 2m side of shock absorber 1 concerning the present invention. It is the back perspective view of the shock absorber 1 which concerns on this invention, (a) is the back perspective view seen from the right side 2m side, (b) is the back perspective view seen from the left side 21 side. (A) is a rear view of the shock absorber 1 according to the present invention, and (b) is an enlarged view of a region X indicated by a broken line in (a). (A) is a front view of the shock absorber 1 according to the present invention, and (b) is a right side view. It is an end elevation in various directions of shock absorber 1 concerning the present invention, (a) is an AA line cutting section end view of Drawing 4 (a), and (b) is BB of Drawing 4 (a). FIG. 4C is an end view of the line cut portion, and FIG. 4C is an end view of the CC line cut portion of FIG. It is a conceptual diagram for demonstrating "Jabara" deformation | transformation and "Kugi-shaped" deformation | transformation, (a) is before a deformation | transformation, (b) is a "Jabara" deformation | transformation, (c) is a figure in a "Kugi-shaped" transformation. 4 (b) is a schematic diagram of the region Y, (d) is before the deformation, (e) is the “Jabara” deformation, (f) is the second in the region Y of FIG. It is a schematic diagram of the cut part end view in the vertical direction of the drawing passing through the welded part. FIG. 6B is an enlarged schematic diagram of a region Z in FIG. 5B, illustrating how the angle θ of the bottom BP with respect to the load input surface changes due to the input of the load F. FIG. ) Is a diagram showing a state in which the load F is being input. It is an enlarged view (refer to Drawing 3) of field X in the modification of shock absorber 1 concerning the present invention, (a) is a figure shown in modification 1 and (b) about modification 2. FIG. 6 is an enlarged view (see FIG. 3) of a region X in a modified example of the shock absorber 1 according to the present invention, and is a diagram showing the modified example 3. It is a conceptual diagram explaining coexistence of "Jabara" deformation and "Kugi" deformation.

  Hereinafter, embodiments of the present invention will be described. Various characteristic items shown in the following embodiments can be combined with each other.

  A shock absorber 1 according to an embodiment will be described with reference to FIGS. The shock absorber 1 is formed of a hollow formed body that is deformed by an input of a load F from the vicinity of the occupant's waist and absorbs an impact to the vicinity of the waist. The hollow formed body has a hollow portion, and is a blow molded body formed by blow molding, for example.

<Configuration of shock absorber 1>
The shock absorber 1 according to the present embodiment includes a load input surface to which a load is input, an opposing surface that is spaced apart from the load input surface, and a connecting surface that connects the load input surface and the opposing surface. Specifically, as shown in FIG. 1, the shock absorber 1 includes a front surface 2f and a back surface 2r that are spaced apart from each other, and a right side surface 2m and a left side surface 21 that connect the front surface 2f and the back surface 2r and face each other. Is provided. The right side surface 2m is a surface facing the indoor side of a vehicle or the like, and is a surface on which a crew member collides in the event of an accident. Moreover, the front surface 2f and the back surface 2r are connected, and the upper surface 2u and the bottom surface 2b which oppose each other are provided. A parting line PL is formed through the front surface 2f, the upper surface 2u, the back surface 2r, and the bottom surface 2b. Here, in the present embodiment, it is assumed that the occupant collides with the shock absorber 1 at the time of the collision of the vehicle, and the right side surface 2m corresponds to the load input surface. Further, the left side surface 21 corresponds to the facing surface. In addition, the front surface 2f, the back surface 2r, the top surface 2u, and the bottom surface 2b correspond to a connection surface. And in this embodiment, the three attaching parts 13 for attaching the shock absorber 1 to a vehicle structural member are provided. In the present specification, the top, bottom, left and right, front and back are expressed from the viewpoint when the right side 2m is right and the left side 21 is left.

  As shown in FIG. 1, the shock absorber 1 is formed with recessed ribs 10 so as to straddle the right side surface 2m and the front surface 2f. In the present embodiment, the two recessed ribs 10 are formed so as to extend substantially in parallel with each other. The recessed rib 10 is a form of groove rib. As shown in FIGS. 1 and 5, the recessed rib 10 includes a bottom BP provided along a direction in which the recessed rib 10 extends, and a load input surface at a portion where the bottom BP and the load input surface (right side surface 2 m) are in contact with each other. It is provided so that the angle between the extension line EL of (right side surface 2m) is 10 to 85 degrees. Further, the recessed rib 10 is configured not to reach the parting line PL formed on the front surface 2 f of the shock absorber 1.

  As shown in FIG. 2, the shock absorber 1 includes a first right groove rib 5m, a first left groove rib 51, a second right groove rib 6m, a second left groove rib 61, and a third right groove rib on the back surface 2r. 7m and third left groove rib 7l. Here, m at the end of each component indicates that the right side surface 2m is a groove rib formed by being recessed toward the left side surface 21. Further, l at the end of each component indicates that the left side surface 21 is a groove rib formed by being recessed toward the right side surface 2m. The same applies to m and l at the end of other components in the following description. Hereinafter, the first right groove rib 5m and the first left groove rib 5l are combined, and the first groove rib 5, the second right groove rib 6m and the second left groove rib 6l are combined, the second groove rib 6, and the third right groove. The rib 7m and the third left groove rib 7l are collectively referred to as a third groove rib 7. Then, as shown in FIG. 3B, a first welded portion 8 is formed in which at least a part of the tip portions of the first right groove rib 5m and the first left groove rib 5l are welded. Further, a second welded portion 9 is formed by welding at least a part of the tip of the second right groove rib 6m and the second left groove rib 6l. In this embodiment, the 1st welding part 8 and the 2nd welding part 9 are provided in the same plane (back surface 2r) contained in a connection surface. Here, as FIG.2 and FIG.3 shows, the 1st welding part 8 and the 2nd welding part 9 are formed on the parting line PL. In the present embodiment, the first left groove rib 5l and the second left groove rib 61 correspond to "first and second facing surface groove ribs formed with the facing surfaces recessed toward the load input surface". The first right groove rib 5m and the second right groove rib 6m correspond to “the first and second load input surface groove ribs formed with the load input surface recessed toward the opposing surface”.

  Further, as shown in FIGS. 1 and 2, the shock absorber 1 is provided with one right round rib 4m and two oblique groove ribs 11 on the right side surface 2m. On the other hand, one left round rib 4l and three oblique groove ribs 11 are provided on the left side surface 21. Then, one meniscus rib 12 is provided on the upper surface 2u, and two meniscus ribs 12 are provided on the bottom surface 2b. In the present embodiment, the first right groove rib 5m communicates with the right round rib 4m formed on the right side surface 2m. The location, shape, size, orientation, and number of these ribs are arbitrary and are appropriately formed according to desired characteristics.

<First Welding Portion 8 and Second Welding Portion 9>
Next, the 1st welding part 8 and the 2nd welding part 9 are demonstrated using FIG. 3 (a) is a rear view of the shock absorber 1 according to the present invention, and FIG. 3 (b) is an enlarged view of a region X indicated by a broken line in FIG. 3 (a).

  As shown in FIG. 3B, a first welded portion 8 is formed by welding at least a part of the tip portions of the first right groove rib 5m and the first left groove rib 5l. Further, a second welded portion 9 is formed by welding at least a part of the tip of the second right groove rib 6m and the second left groove rib 6l. The first welded portion 8 has a minimum thickness at the central portion 8a in the width direction of the ribs 5m and 5l, and the thickness increases as the distance from the center increases. On the other hand, the second welded portion 9 has a substantially constant thickness in the entire width direction of the ribs 6m and 6l. However, the second welded portion 9 is provided with a thin-walled portion 9a extending in the depth direction of the ribs 6m and 6l. It has been. For this reason, in the present embodiment, the central portion 8 a in the width direction of the ribs 5 m and 5 l is the thinnest portion of the first welded portion 8, and the thin-walled portion 9 a is the thinnest portion of the second welded portion 9. The thickness d1 (not shown) of the thinnest part (thinned part 9a) of the second welded part 9 is smaller than the thickness D of the thinnest part (center part 8a) of the first welded part 8. Further, the thickness d of the second welded portion 9 other than the thin-walled portion 9a is also thinner than the thickness D of the thinnest portion (center portion 8a) of the first welded portion 8. When the load F is input to the load input surface (right side surface 2m), the thin-walled portion 9a is destroyed, and the “abstract” deformation of the shock absorber 1 is induced.

  The value of the ratio of the thickness D to the thickness d is, for example, 1.5 or more. Preferably, the ratio value is 1.7 or more. More preferably, the value of this ratio is 2 or more. Such ratio values are specifically 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 10, and may be a value in the range between any two of the numerical values exemplified here or a value larger than 10.

  The thickness D is, for example, 1 mm to 10 mm. Preferably, it is 1.5 mm-8 mm. More preferably, it is 2 mm-5 mm. The thickness D is specifically 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 2, 2.05, 2.1, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, It is 10 mm, and may be a value in the range between any two of the numerical values exemplified here or a value larger than 10.

  The thickness d is, for example, 0.1 mm to 6 mm. Preferably, it is 0.3-5 mm. More preferably, it is 0.5-3 mm. Specifically, the thickness d is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.5, 2, 2.5, 3, 3.5, It is 4, 4.5, 5, 5.5, 6 mm, and may be a value in the range between any two of the numerical values exemplified here or larger than 6. Moreover, the thickness d1 of the thin part 9a is 0.01 mm-3 mm, for example. Preferably, it is 0.03 to 2 mm. More preferably, it is 0.05-1 mm. Specifically, the thickness is 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0. 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35 0.4, 0.45, 0.5, 0.55, 0.6, 0.7, 0.8, 0.85, 0.9, 0.95, 1, 1.5, 2, 2 .5, 3 mm, and may be a value in the range between any two of the numerical values exemplified here or a value larger than 3.

  The width and depth of the second right groove rib 6 in plan view are, for example, 1 mm to 20 mm. Preferably, it is 1.5 mm-15 mm. More preferably, it is 2 mm-10 mm. Specifically, the width and depth are 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, It is 20 mm, and may be a value in the range between any two of the numerical values exemplified here or larger than 20.

  In the present embodiment, the depth of the first groove rib 5 (depth toward the inside of the hollow formed body) is deeper than the depth of the second groove rib 6. The value of the ratio of the depth of the first groove rib 5 to the depth of the second groove rib 6 is, for example, 1.01 or more. Preferably, it is 1.03 or more. More preferably, it is 1.05 or more. Specifically, the ratio values are 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1. 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2 and the range between any two of the numerical values illustrated here It may be a value within or greater than 2. By comprising in this way, the rigidity of the 1st groove rib 5 improves and it becomes possible to absorb an impact suitably.

  Further, as shown in FIG. 2, the first right groove rib 5m communicates with the right round rib 4m formed on the right side surface 2m. With this configuration, the rigidity of the first right groove rib 5m can be further improved. Instead of the first right groove rib 5m, the first left groove rib 5l may communicate with the left round rib 4l formed on the left side surface 21. Further, the first right groove rib 5m may communicate with the right round rib 4m, and the first left groove rib 5l may communicate with the left round rib 4l.

  With this configuration, when the load F is input to the right side surface 2m that is the load input surface, the second welded portion 9 (and the thin-walled portion) of the second groove rib 6 before the first groove rib 5 is obtained. 9a) is destroyed, and it becomes possible to absorb the impact by deforming it into a “shape”. Further, even after the second welded portion 9 (and the thin-walled portion 9a) is broken, the first groove rib 5 is deformed in a “jably” manner until the first welded portion 8 of the first groove rib 5 is broken. Thus, the load F can be absorbed appropriately. Here, the “Jabara” deformation and the “Kugi” deformation will be described.

  FIG. 6 is a conceptual diagram for explaining the “Jabara” deformation and the “Kugi” deformation. Here, FIGS. 6A to 6C are schematic views of the region Y in FIG. 4B, and the load F is input from the front of the drawing toward the back. Moreover, FIG.6 (e)-FIG.6 (g) are the schematic diagrams of the cut part end elevation in the vertical direction of drawing which passes along the 2nd welding part 9 in the area | region Y of FIG.4 (b), and the load F is drawing. It is input in the downward direction.

  As shown in FIGS. 6A and 6E, when a load F is input to the right side surface 2m, as shown in FIGS. 6B and 6F, the shock absorber 1 is deformed into a “Jabara” shape. The load F is absorbed. After that, when the load F is further input and the thin portion 9a constituting a part of the second welded portion 9 is broken, the periphery of the thin portion 9a is deformed into a “shape” in FIG. The remaining portion of the second welded portion 9 is deformed “jabala”. In other words, the load F can be appropriately absorbed by coexistence of the “shape” deformation caused by the destruction of the thin-walled portion 9 a and the “jabala” deformation caused by the remaining portion of the second welded portion 9. . Here, for the convenience of explanation, the coexistence of the “shape” deformation and the “jabala” deformation around the second welded portion 9 has been described, but the present invention is not limited to this. When the second welded portion 9 of the second groove rib 6 is broken, a “shape” deformation occurs around the second welded portion 9 until the first welded portion 8 of the first groove rib 5 is broken. “Jabara” deformation occurs around the first weld 8. FIG. 10 schematically shows such a state. Here, the vector B1 represents the relationship between the “displacement” and the “load F” when only the “Jabara” deformation continues, and the vector B2 represents the “displacement” and the “load” when only the “<shape” deformation occurs. F ". In the present embodiment, the “figure” deformation caused by the second welded portion 9 and the “jabala” deformation caused by the first welded portion 8 coexist, whereby the load F is applied in the direction in which the vectors B1 and B2 are combined. It can be made substantially constant. And if the 1st welding part 8 and the 2nd welding part 9 are destroyed, the load F will increase. In addition, the absorption rate of the load F is larger in the “shape” deformation than in the “jabala” deformation.

  Therefore, when the load F is input to the load input surface (right side surface 2m), the second groove rib 6 is deformed “jaggedly” until the second welded portion 9 (and the thin portion 9a) is broken, and the second After the welded portion 9 (and the thin-walled portion 9a) is broken, the load F can be suitably absorbed by the second groove rib 6 being deformed in a “shape”. In addition, even after the second welded portion 9 (and the thin-walled portion 9a) of the second groove rib 6 is broken, the first groove rib 5 is deformed until the first welded portion 8 is broken. Thus, the load F can be absorbed more suitably.

  As described above, the second groove rib 6 having the second welded portion 9 for inducing breakage and the first groove rib 5 having the first welded portion 8 for improving rigidity are disposed adjacent to each other. Thus, it is possible to provide the shock absorber 1 that exhibits the fracture behavior according to the design intention. In other words, the shock absorber 1 according to the present embodiment suitably absorbs the load by combining the “shape” deformation caused by the second welded portion 9 and the “jabala” deformation caused by the first welded portion 8. It becomes possible to do. Note that the shape and size of the shock absorber 1 described in the present embodiment are merely examples, and the present invention is not limited to these. For example, the second welded portion 9 may be formed thicker than the first welded portion 8. Alternatively, the second welded portion 9 may be formed on the second groove rib 6, and the welded portion thinner than the second welded portion 9 may be formed on the first groove rib 5 and the third groove rib 7.

<Recessed rib 10>
Next, the recessed rib 10 is demonstrated using FIG.4 and FIG.5. As shown in FIG. 4A, in the present embodiment, the two recessed ribs 10 are provided so as to extend substantially parallel to each other across the front surface 2f and the right side surface 2m. The recessed rib 10 serves to weaken the rigidity against the load F. This is because if the rigidity of the right side 2m, which is the load input surface, is too large, the burden on the crew member's body that has collided with the right side 2m will increase. It is for protecting.

  4 and 5, the recessed rib 10 has a bottom BP, a bottom BP, and a load input surface (right side surface 2m) at an end surface that passes through the bottom BP provided along the direction in which the recessed rib 10 extends. ) And the extension line EL of the load input surface (right side surface 2m) at the portion in contact with each other. Here, FIG. 5 (a) is an end view taken along line AA in FIG. 4 (a), and FIG. 5 (b) is an end view taken along line BB in FIG. 4 (a). FIG. 5C is an end view taken along the line C-C in FIG. 4A corresponds to an end surface that passes through the bottom BP provided along the direction in which the recessed rib 10 extends. The angle θ between the extension line EL and the bottom BP is, for example, 10 ° to 80 °. Preferably, it is 20 ° to 70 °. More preferably, the angle is 30 ° to 60 °. The angle θ is specifically 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80 °, and any of the numerical values exemplified here Or within a range between the two. In the present embodiment, the angle θ is 45 °.

  Further, the recessed rib 10 is configured not to reach the parting line PL formed on the front surface 2 f of the shock absorber 1. This is because the parting line PL has high rigidity, so that when the recessed rib 10 reaches the parting line PL, deformation of the recessed rib 10 described later is difficult to occur, which is contrary to the purpose of weakening the rigidity of the right side surface 2m. It is to become.

  Further, as shown in FIGS. 4, 5 (a), and 5 (c), the recessed rib 10 is configured to have a width that decreases from the edge of the recessed rib 10 toward the bottom BP. Moreover, the recessed rib 10 is comprised so that the width | variety in the edge of the recessed rib 10 may become narrow toward the end of the length direction. The recessed rib 10 has a substantially V-shaped cross section perpendicular to the direction in which the recessed rib 10 extends. As shown in FIG. 5A, the recessed rib 10 has a substantially V-shaped cross section in the end view taken along the line AA. Further, as shown in FIG. 5C, the recessed rib 10 has a substantially V-shaped cross section in the end view of the CC line cut portion. The two recessed ribs 10 are provided so as to extend substantially in parallel with each other. With such a configuration, as shown in FIG. 7, when a load F is input to the load input surface (right side surface 2m), the concave rib 10 is deformed so as to be bent with the bottom BP as an axis, and the extension line EL is deformed. The bottom portion BP can be deformed in a direction in which the angle θ decreases, and the rigidity of the right side surface 2m is weakened. Further, by providing the two recessed ribs 10 so as to extend in parallel with each other, the deformation of one recessed rib 10 and the deformation of the other recessed rib 10 interfere with each other, and the rigidity of the right side surface 2m can be further reduced. Become.

  And the recessed rib 10 is provided in the location where the rigidity of the shock absorber 1 is large. Specifically, as shown in FIG. 4A, the distance between the parting line PL and the ridge line RL formed by the front surface 2f and the right side surface 2m is small. For example, the recessed rib 10 is provided such that the distance L2 between the lower recessed rib 10 and the parting line PL is smaller than L1 which is the maximum distance between the parting line PL and the ridge line RL. . Further, the concave rib 10 is provided so that the distance L3 between the upper concave rib 10 and the parting line PL is smaller than that of L1. This is because the smaller the distance from the parting line PL is, the smaller the blow ratio is. The larger the distance from the parting line PL is, the larger the blow ratio is. This is because the thickness of the hollow formed body is increased and the rigidity is increased as compared with a portion having a large distance from the line PL. Therefore, it is possible to weaken the rigidity with respect to the load F by providing the recessed rib 10 at a location where such rigidity is large.

  Here, the value of the ratio of L2 to L1 and the value of the ratio of L3 to L1 are values smaller than 0.95, for example. Preferably, the value is less than 0.9. More preferably, the value is smaller than 0.85. Specifically, the ratio values are 0.95, 0.94, 0.93, 0.92, 0.91, 0.9, 0.89, 0.88, 0.87, 0.86. 0.85, 0.84, 0.83, 0.82, 0.81, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0 .1 and may be within a range between any two of the numerical values exemplified herein or less than 0.1.

  Further, the value of the ratio of the blow ratio at the location where the recessed rib 10 is provided relative to the blow ratio at the location corresponding to L1 (the maximum blow ratio of the hollow formed bodies) is a value smaller than 0.95, for example. Preferably, the value is less than 0.9. More preferably, the value is smaller than 0.85. Specifically, the ratio values are 0.95, 0.94, 0.93, 0.92, 0.91, 0.9, 0.89, 0.88, 0.87, 0.86. 0.85, 0.84, 0.83, 0.82, 0.81, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0 .1 and may be within a range between any two of the numerical values exemplified herein or less than 0.1.

<Modification>
Next, various modifications of the shock absorber 1 according to the present invention will be described with reference to FIGS. 8 and 9 are enlarged views (see FIG. 3) of the region X in a modified example of the shock absorber 1 according to the present invention, FIG. 8 (a) is a modified example 1, and FIG. 8 (b) is a modified example. 2 and 9 are diagrams showing a third modification. 3 that are the same as those shown in FIG. 3 are marked with the same symbols and descriptions of them will be omitted.

<Modification 1: Slit>
A slit 9b having a width G may be provided in the second welded part 9 without providing the thin-walled part 9a in the second welded part 9. The slit 9b can be formed, for example, by cutting a part of the second welded portion 9. Since the thickness of the slit 9b is 0, when the slit 9b is provided in the second welded portion 9, the thickness of the thinnest portion of the second welded portion 9 becomes 0. In the present modification, the “9” deformation of the shock absorber 1 is induced by the widening of the slit 9b.

<Modification 2: No thin part>
The second welded portion 9 may have a substantially uniform thickness without providing the thin welded portion 9a in the second welded portion 9. In this case, the thickness d of the second welded portion 9 is the thickness of the thinnest portion of the second welded portion 9. In the present modification, the second welded portion 9 is broken, thereby inducing a “shaped” deformation of the shock absorber 1.

<Modification 3: D <d>
In the present embodiment, the thickness d of the second welded part 9 other than the thin part 9a is thicker than the thickness D of the thinnest part (center part 8a) of the first welded part 8. On the other hand, the thickness d1 (not shown) of the thinnest portion (thin wall portion 9a) of the second welded portion 9 is thinner than the thickness D of the thinnest portion (center portion 8a) of the first welded portion 8. . For this reason, in this embodiment, when the thin-walled portion 9a is broken, the “abstract” deformation of the shock absorber 1 is induced.

  Although the shock absorber 1 according to the present invention has been described above, the present invention is not limited to these. For example, the first groove rib 5, the second groove rib 6, and the third groove rib 7 may be provided on the front surface 2f. The first groove rib 5 may be provided on the back surface 2r or the front surface 2f, and the second groove rib 6 may be provided on the upper surface 2u or the lower surface 2b. The first groove rib 5 may be provided on the upper surface 2u or the lower surface 2b, and the second groove rib 6 may be provided on the back surface 2r or the front surface 2f. Further, the shape, size, number, etc. of the first groove rib 5, the second groove rib 6, the third groove rib 7, the right round rib 4m, the left round rib 41, the oblique groove rib 11 and the half moon rib 12 are arbitrary. It is possible to design appropriately. Further, the number of the recessed ribs 10 can be 1, 3, 4, 5, 6, 7, 8, 9, 10 or more. Further, the front surface 2f and the back surface 2r, the right side surface 2m and the left side surface 21, and the top surface 2u and the bottom surface 2b are configured to face each other, but need not be parallel to each other. For example, the opposing surfaces may be substantially parallel. Furthermore, in addition to these surfaces, you may provide the inclined surface which connects surfaces. Further, “an impact absorber made of a hollow molded body having a hollow portion, a load input surface into which a load is input, an opposing surface that is spaced apart from the load input surface, and the load input surface and the opposing surface. A connecting surface for connecting the surfaces, and the connecting surface includes first and second opposing surface groove ribs formed by recessing the opposing surface toward the load input surface, and the load input surface. First and second load input surface groove ribs formed to be recessed toward the facing surface are provided, and first ends of the first facing surface groove rib and the first load input surface groove rib are welded to each other. 1 welded portion, a second welded portion in which the tip portions of the second facing surface groove rib and the second load input surface groove rib are welded to each other, and the thickness of the thinnest portion of the second welded portion is: An impact absorber thinner than the thickness of the thinnest part of the first welded part; A shock-absorbing body comprising a hollow molded body having a load, connecting a load input surface to which a load is input, a facing surface spaced apart from the load input surface, and the load input surface and the facing surface. A connecting surface, a parting line is formed on the connecting surface, a groove-shaped recessed rib extending across the load input surface and the connecting surface is provided, and the recessed rib extends in the extending direction. In the end surface passing through the bottom portion provided along, the angle between the bottom portion and the extension line of the load input surface at a portion where the bottom portion and the load input surface are in contact is 10 to 85 degrees. Recessed ribs are provided, and the recessed ribs are configured so as not to reach the parting line provided on the connecting surface. It provides the unique effect.

1: shock absorber, 2f: front, 2r: back, 2l: left side, 2m: right side, 2u: top, 2b: bottom, 4m: right round rib, 4l: left round rib, 5m: first right groove 5l: 1st left groove rib, 6m: 2nd right groove rib, 6l: 2nd left groove rib, 7m: 3rd right groove rib, 7l: 3rd left groove rib, 8: 1st welding part, 8a : Central part, 9: second welded part, 9a thin-walled part, 9b: slit, 10: recessed groove rib, 11: oblique groove rib, 12: meniscus rib, 13: mounting part

Claims (6)

A shock absorber comprising a hollow molded body having a hollow portion,
A load input surface to which a load is input; an opposing surface that is spaced apart from and opposed to the load input surface; and a connecting surface that connects the load input surface and the opposing surface;
The connecting surface is formed with first and second opposing surface groove ribs formed by recessing the opposing surface toward the load input surface, and the load input surface being recessed toward the opposing surface. First and second load input surface groove ribs are provided,
The first welded portion where the distal ends of the first opposed surface groove rib and the first load input surface groove rib are welded, and the distal ends of the second opposed surface groove rib and the second load input surface groove rib are welded together. A second welded portion is provided,
The thickness of the thinnest part of the second welded part is thinner than the thickness of the thinnest part of the first welded part,
Shock absorber. The first and second welds are provided on the same plane included in the connection surface,
The shock absorber according to claim 1. The depths of the first facing surface groove rib and the first load input surface groove rib are deeper than the depths of the second facing surface groove rib and the second load input surface groove rib,
The shock absorber according to claim 1 or 2. The ratio of the thickness of the thinnest part of the first welded part to the thickness of the thinnest part of the second welded part is 1.5 or more.
The shock absorber according to any one of claims 1 to 3. The hollow molded body is a blow molded body having a parting line,
The first and second welds are formed on the parting line.
The shock absorber according to any one of claims 1 to 4. Ribs are formed on the opposing surface or the load input surface,
The first opposing surface groove rib or the first load input surface groove rib communicates with the rib;
The shock absorber according to any one of claims 1 to 5.