JP4130558B2 - Shock absorber for motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorber for a two-wheeled vehicle that absorbs a shock at the time of a frontal collision of the two-wheeled vehicle and protects an occupant.
[0002]
[Prior art]
In general, in a four-wheeled vehicle such as a passenger car, an impact absorber is used for the purpose of protecting an occupant during a collision. For example, a shock absorber is provided inside the pillar garnish to protect the occupant's head during a side collision, or a shock absorber is provided inside the door trim to protect the occupant's waist and chest. Have been. As the shock absorber, resin ribs that can be manufactured at a relatively low cost are widely used, as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-164810 and Japanese Patent No. 2978083.
[0003]
[Problems to be solved by the invention]
However, effective studies have not been made on the energy absorption at the time of collision in the case of motorcycles.
[0004]
In addition, a shock absorber for a two-wheeled vehicle needs to absorb much larger energy than a shock absorber for a four-wheeled vehicle. That is, in the case of a four-wheeled vehicle, the kinetic energy Ek = 1/2 mv2 to be absorbed is based on the energy with which a dummy head having a mass of 4.54 kg collides at a speed of 15 mile / h (= 6.71 m / s). 102.1 (J) is set. On the other hand, in the case of a two-wheeled vehicle, assuming that the vehicle mass is 100 kg and the traveling speed is 50 km / h (= 13.89 m / s), the kinetic energy Ek to be absorbed is 9646 (J), It was necessary to absorb a large amount of energy.
[0005]
In addition, when the above-described resin rib for a four-wheeled vehicle is applied to a two-wheeled vehicle, the height of the rib is about 60 mm and the energy absorption stroke is small, so it is necessary to secure a wide mounting area as a whole of the shock absorber. There is. However, since the shock absorber is attached to the front part of the vehicle in a two-wheeled vehicle, it is impossible to increase the attachment area. Furthermore, although a method of forming the resin rib with a large height is also conceivable, the thickness of the rib gradually increases toward the base end side because the resin rib needs to be tapered at the time of molding. For this reason, when the height of the resin rib is made large, the base end side becomes too thick, and there is a problem that the buckling deformation generation load becomes large.
[0006]
This invention is made paying attention to the subject which exists in such a prior art. The purpose is to provide a shock absorber for a motorcycle that can be easily attached to the front part of a motorcycle with a small mounting area, and that can receive a large impact evenly at the time of collision and absorb the impact efficiently. It is in.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, the invention according to claim 1 includes a plurality of shock absorbing ribs made of synthetic resin formed with a plurality of shock absorbing ribs, and the shock absorbing ribs are provided at the base ends of the shock absorbing ribs. It is a shock absorber for two-wheeled vehicles that are stacked so that the direction from the front to the front is the front-rear direction of the two-wheeled vehicle, and is attached to the front part of the two-wheeled vehicle. , Provided with restraining means for restraining the shock absorbing ribs from being crushed unevenlyThe restraining means is formed on one of the stacking joint surfaces of the adjacent buffer members, and has a convex structure protruding in the stacking direction and a concave structure formed on the other and recessed in the stacking direction.It is characterized by this.
[0008]
  Therefore, according to the first aspect of the present invention, the shock absorbing stroke can be increased with respect to the frontal collision of the two-wheeled vehicle by providing the plurality of buffer members in a stacked configuration. Therefore, it is not necessary to secure a large mounting area, and it can be easily mounted on the front portion of the two-wheeled vehicle with a small mounting area, and a large impact at the time of collision can be absorbed efficiently. Further, since a plurality of buffer members are stacked, the height of the shock absorbing rib in one buffer member can be reduced (for example, about 60 mm), and the shock absorbing rib can be provided even if a taper is formed during resin molding. Therefore, the buckling deformation load can be prevented from becoming large in the second half of the deformation (process). Furthermore, since the suppression means is provided in each buffer member, the plurality of shock absorbing ribs are not crushed unevenly when receiving a load or impact load at the time of collision. Therefore, it is possible to prevent the possibility of unbalanced stacking of the plurality of buffer members due to uneven crushing of the shock absorbing ribs, and an excellent shock absorbing effect can be exhibited. Here, the fact that the plurality of shock absorbing ribs are not crushed unevenly means that the plurality of shock absorbing ribs are crushed almost uniformly.
In addition, the engagement configuration between the convex surface and the concave surface can reliably prevent the occurrence of displacement in the direction perpendicular to the stacking direction in the plurality of buffer members in the stacked state.
[0009]
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the shock absorbing ribs are formed in a lattice shape.
Therefore, in the second aspect of the invention, the entire shock absorbing rib can effectively absorb the shock, and the passenger and the vehicle can be effectively protected.
[0010]
The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the shock absorbing rib is formed so that the thickness gradually decreases from the base end to the tip. It is what.
[0011]
Therefore, in the invention described in claim 3, the impact absorbing ribs can be crushed from the distal end side toward the proximal end side, and the impact absorption can be effectively performed.
[0012]
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, each of the buffer members is constituted by a substrate and a shock absorbing rib integrally formed at the base end thereof. It is characterized by that.
[0013]
Therefore, according to the invention described in claim 4, when a load or impact load at the time of collision is applied to each buffer member in a stacked state, the load or impact load at the time of collision is first received by the entire substrate, It is transmitted to each shock absorbing rib and the shock absorbing ribs are continuously crushed. Therefore, the load or impact load at the time of collision can be absorbed more effectively.
[0014]
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects of the present invention, the restraining means is configured such that the arrangement density of the shock absorbing ribs is coarser in the central area of the buffer member than in the outer peripheral area. It is characterized by having the structure made to become.
[0015]
Therefore, according to the fifth aspect of the present invention, the shock absorbing ribs disposed in the central region are arranged in the central region because the arrangement density of the shock absorbing ribs is coarse in the central region of the shock absorbing member where the shock absorbing ribs are difficult to deform. The occurrence of a crushing delay in the rib can be suppressed. Therefore, the plurality of shock absorbing ribs can be uniformly and stably crushed.
[0016]
According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects of the present invention, the suppressing means is arranged such that the shock absorbing rib is not present on the outer peripheral edge of the buffer member. The structure is such that the outer peripheral side of the buffer member is opened.
[0017]
Therefore, according to the sixth aspect of the present invention, since the shock absorbing ribs are not extended and arranged on the outer peripheral edge of the shock absorbing member where the shock absorbing ribs easily escape to the outside, It is possible to reliably prevent the occurrence of unbalance in the plurality of buffer members.
[0018]
The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the suppressing means is an engaging portion formed on one of the stacked joint surfaces of the adjacent buffer members. And a locking structure with a locking claw formed on the other side.
[0019]
Therefore, according to the seventh aspect of the present invention, due to the locking configuration of the engaging portion and the locking claw, positional shift in the direction perpendicular to the stacking direction occurs in the plurality of stacked buffer members. It is possible to reliably prevent such a risk.
[0020]
According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the suppressing means is formed on each of the stacked joint surfaces of the adjacent buffer members and corresponds to each other. It is characterized by comprising insertion holes to be inserted and pins inserted through the corresponding insertion holes.
[0021]
Therefore, according to the eighth aspect of the present invention, it is possible to reliably prevent the displacement of the plurality of stacked buffer members in the direction perpendicular to the stacking direction due to the insertion of the pins into the both insertion holes. Can be prevented.
[0024]
  Claim9According to the invention described in claimAny one of Claims 1-8.In the invention described in (1), the convex surface and the concave surface are formed in a central portion of the stacking joint surface.
  Therefore, the claims9According to the invention described in (4), a plurality of buffer members can be stacked in an aligned state, and shock absorption can be reliably performed.
[0025]
  Claim 10According to the invention described in claimAny one of Claims 1-8.In the invention described in (1), the convex surface and the concave surface are formed on the entire stacked joint surface.
  Accordingly, claim 10According to the invention described in the above, a plurality of buffer members can be stacked in an aligned state, shock absorption can be performed reliably, and shock absorption can be performed on the entire surface of the buffer member, which is extremely effective. Can perform shock absorption.
[0026]
  Claim 11The invention according to claim 1 is a first to a first aspect.0In the invention according to any one of the above, the suppressing means is a flexible sheet that is joined and arranged on the outer periphery of the plurality of buffer members in a stacked state so that the buffer members are not displaced. It is the position control member which becomes.
[0027]
  Therefore, this claim 11According to the invention described in (1), the arrangement of the position regulating member can surely prevent the occurrence of positional deviation in the direction perpendicular to the stacking direction in the plurality of stacked buffer members.
[0028]
  Claim 12According to the invention described in claim 1,1In the invention described in (1), the position restricting member has a cylindrical shape.
  Accordingly, claim 12According to the invention described in (1), a plurality of buffer members can be integrally held by the position restricting member, and displacement of the buffer member can be prevented and effective shock absorption can be performed.
[0029]
  Claim 13In the invention described in claim 1,1Or 12In the invention described in item 1, the position regulating member is substantially in close contact with the outer peripheral surface of the buffer member.
[0030]
  Accordingly, claim 13In the invention described in (1), the shock-absorbing member can be prevented from being displaced by the close contact of the position-regulating member, and effective shock absorption can be performed.
  Claim 14In the invention described in claim 1,1Or claim 12In the invention described in (1), the position regulating member is characterized in that an adhesive is applied to the inner surface thereof.
[0031]
  Accordingly, claim 14In the invention described in (1), the buffer member can be maintained in an aligned state by the action of the adhesive, and effective shock absorption can be performed.
  Claim 15In the invention described in claim 1,1-Claim 14In the invention according to any one of the above, the position restricting member is made of a heat shrinkable film.
[0032]
  Accordingly, claim 15In the invention described in (1), the impact regulating member can be tightly held and aligned and held by the position regulating member, and the impact absorbing function can be effectively exhibited.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Below, 1st Embodiment of this invention is described based on FIGS.
[0034]
As shown in FIGS. 1 and 2, the shock absorber 41 for a motorcycle according to this embodiment is attached and fixed to the front portion of the motorcycle 43 while being covered with a cover 42 made of a hard synthetic resin. It absorbs the impact at the time of collision and protects the occupant and the vehicle body. The shock absorber 41 is formed by stacking a plurality of (in the embodiment, six) buffer members 44, and each buffer member 44 is made of PP (polypropylene), PPF (polypropylene + inorganic), ABS, PC / ABS (polycarbonate). And an alloy of ABS and the like). Each buffer member 44 is joined to each other at an appropriate position.
[0035]
As shown in FIGS. 3 to 5, each of the buffer members 44 includes a plurality of vertical rib portions 45 c and horizontal rib portions 45 d that extend in parallel in the vertical direction and the horizontal direction at intervals. A shock absorbing rib 45 having a shape and a substrate 46 integrally formed on the base end 45a side of the shock absorbing rib 45 are formed. The outermost vertical rib portion 45 c and the horizontal rib portion 45 d located on the outer peripheral edge of the substrate 46 constitute an outer peripheral wall of the buffer member 44. The shock absorbing rib 45 is formed so that the thickness gradually decreases from the base end 45a toward the tip 45b, and the direction from the base end 45a to the tip 45b of the shock absorbing rib 45 is the vehicle longitudinal direction of the two-wheeled vehicle 43. As described above, a plurality of buffer members 44 are stacked.
[0036]
In the stacked state of the buffer members 44, as shown by an arrow in FIG. 3, when the impact load or the impact load toward the rear of the two-wheeled vehicle 43 is applied to the shock absorber 41, the entire board 46 is in a collision state. Or an impact load is received and transmitted to the lattice-like shock absorbing rib 45. As a result, the shock absorbing rib 45 is buckled and crushed, and the load at the time of collision or the shock load is effectively absorbed. That is, when a shock in the front-rear direction is applied to the buffer member 44, buckling proceeds while the shock absorbing rib 45 absorbs the shock from its weak tip side.
[0037]
Here, as shown in FIGS. 2 and 5, in consideration of conditions such as the mounting space of the motorcycle 43, the longitudinal length L1 of the cushioning member 44 is about 140 mm, the lateral length L2 is about 200 mm, It is preferable to set the arrangement pitch P of the directional rib portions 45c and the lateral rib portions 45d within a range of 20 to 30 mm. In consideration of the impact absorbing effect, the height H of the impact absorbing rib 45 is in the range of 30 to 60 mm, the thickness T1 of the base end 45a is in the range of 1.0 to 2.5 mm, and the thickness of the distal end 45b. It is preferable to set T2 within a range of 0.5 to 2.0 mm. The thickness of the shock absorbing rib 45 can be set so that, for example, the longitudinal rib portion 45c and the lateral rib portion 45d are different from each other, but those values are the same for both the rib portions 45c and 45d. It is preferable to be within the numerical value.
[0038]
Further, with respect to the substrate 46, when the shock absorber 41 receives a load or impact load at the time of collision, the substrate 46 first receives the load or impact load at the time of collision, and then the lattice-shaped shock absorbing rib 45. It is necessary to ensure a certain degree of rigidity in order to disperse and transmit the load. For this reason, as shown in FIG. 5, the thickness T3 of the substrate 46 is preferably set to about 2 mm.
[0039]
As shown in FIG. 4, each buffer member 44 is provided to prevent the shock absorbing ribs 45 from being crushed unevenly when the shock absorber 41 receives a load at the time of collision or an impact load. A suppression structure 47 as a suppression means is provided. In other words, the shock absorbing ribs 45 are provided in the central region of the buffer member 44 so that the arrangement density of the shock absorbing ribs 45 becomes coarse in the central region of the buffer member 44. The cutout portion 48 suppresses the occurrence of a crushing delay in the shock absorbing rib 45 in the central region that is less likely to bend and deform due to a small escape area in the outer circumferential direction, and the shock absorbing rib 45 is evenly and stably throughout. It is going to be crushed.
[0040]
That is, the shock absorbing ribs 45 located outside the buffer member 44 can escape to the outside when deformed, but there are cases where there is no escape space near the center of the buffer member 44. For this reason, under such circumstances, the central portion of the buffer member 44 is apparently hard and the outside is soft. When the buffer member 44 is crushed by compression from the front surface, there is no problem when the first-stage buffer member 44 is crushed, but the central portion of the buffer member 44 located after the second stage is not sufficiently crushed. Sometimes. In such a case, as shown in FIGS. 6A to 6C, when the shock absorbing rib 45 of the buffer member 44 is first crushed at some part on the outside, the buffer member 44 is moved outward from the stacked portion. The shock absorbing rib 45 extruded and pushed out is not crushed so that the energy of the shock cannot be absorbed. Therefore, the entire buffer member 44 is stably crushed by roughening the arrangement density of the shock absorbing ribs 45 at the central portion of the buffer member 44 to create a clearance and intentionally weakening the central portion. .
[0041]
Therefore, a prototype of the shock absorber 41 in which the cutout portion 48 is not formed in the central region of the buffer member 44, and the shock absorber 41 of the embodiment in which the cutout portion 48 is formed in the central region of the buffer member 44, Prepared. And about these prototypes, as shown to Fig.6 (a)-(c), the load or impact load at the time of a collision is made in the state which contact-disposed the impact receiving plate 49 on the buffer member 44 of the stacked state. In addition, when a performance comparison test was performed, the following results were obtained.
[0042]
First, in the prototype of the shock absorber 41 without the cutout portion 48 in the central region, as shown in FIG. 6 (b), the shock absorbing rib 45 in the central region has a crushing delay, and the buffer that has caused the crushing delay. The member 44 becomes an unbalanced shape, and the position shift to the outside occurs. Due to this displacement, the load at the time of collision or the impact load was not sufficiently absorbed. That is, in the prototype without the cutout portion 48, as shown in FIG. 7A, the shock absorber rib 45 of the buffer member 44 is displaced to the buffer member 44 as described above at the intermediate point S1 where the shock absorbing rib 45 is crushed to some extent. As a result, buckling deformation generation load indicating shock absorption was reduced. In addition, since the shock absorbing member 44 that has been displaced does not absorb much of the load or impact load at the time of collision, the buckling deformation generation load becomes high at the second half point S2.
[0043]
On the other hand, in the shock absorber 41 of the embodiment having the cutout portion 48 in the central area, there is no crushing delay in the shock absorbing rib 45 in the central area, so that the buffer member 44 in the stacked state is displaced. Never do. As a result, the shock absorbing ribs 45 of the respective buffer members 44 were uniformly and stably crushed, and the load at the time of collision or the shock load was effectively absorbed. That is, in the shock absorber 41 of this embodiment, as shown in FIG. 7 (b), the characteristics of the buckling deformation generated load with respect to the displacement of the buffer member 44 are stable and the load at the time of collision is not changed. Or the result that the impact load could be absorbed effectively was obtained.
[0044]
The shock absorber 41 as a result shown in FIG. 6B or FIG. 7A also has a sufficient function as a shock absorber, but the shock absorption as a result shown in FIG. 6C or FIG. 7B. The body 41 performs more effective functions.
[0045]
Therefore, according to this embodiment, the following effects can be obtained.
(1) In the two-wheeled vehicle shock absorber 41, a plurality of synthetic resin buffer members 44 provided with a plurality of shock absorbing ribs 45 are attached to the front portion of the two-wheeled vehicle 43 in a stacked state. . For this reason, it is possible to secure a large shock absorbing stroke with respect to the frontal collision of the two-wheeled vehicle 43, and to attach to the front portion of the two-wheeled vehicle 43 with a small mounting area without securing a large mounting area (front projection area). In addition to being able to absorb a large impact at the time of collision efficiently. Further, since the plurality of buffer members 44 are stacked, the height of the shock absorbing rib 45 in one buffer member 44 can be suppressed to a predetermined height of about 60 mm. Therefore, even if a taper at the time of resin molding is provided, the thickness on the base end 45a side of the shock absorbing rib 45 can be reduced without increasing, thereby preventing an increase in buckling deformation load. Can do. In addition, the shock absorber 41 can be formed by stacking the buffer members 44 having the same size and the same configuration, which contributes to cost reduction.
[0046]
Further, since the shock absorbing ribs 45 are formed in a lattice shape by the vertical rib portions 45c and the horizontal rib portions 45d, the shock absorbing ribs 45 are arranged substantially uniformly over the entire area of the buffer member 44. For this reason, shock absorption can be efficiently performed in the entire region of the buffer member 44.
[0047]
Furthermore, each buffer member 44 is provided with a restraining structure 47 for restraining the shock absorbing ribs 45 from being crushed unevenly when receiving a load or impact load at the time of collision. Therefore, the shock absorbing ribs 45 can be uniformly buckled and crushed over the entire surface, and the shock absorbing ribs 45 are crushed unevenly, so that the plurality of buffer members 44 are unbalanced in a stacked state. The possibility of being generated can be prevented, and an excellent impact absorbing effect can be exhibited.
[0048]
(2) In the shock absorber 41 for a two-wheeled vehicle, a substrate 46 is integrally formed at the base end 45 a of each shock absorbing rib 45. Therefore, when a collision load or impact load is applied to each buffer member 44 in the stacked state, the collision load or impact load is first received by the entire substrate 46 and then transmitted to each shock absorbing rib 45. Thus, the shock absorbing ribs 45 are continuously crushed throughout the entire area. Therefore, the load or impact load at the time of collision can be absorbed more effectively.
[0049]
(3) In the two-wheeled vehicle shock absorber 41, the restraining structure 47 is formed such that the arrangement density of the shock absorbing ribs 45 becomes coarser in the central region of the buffer member 44. In other words, the shock absorbing ribs 45 are formed so as to intersect with each other in a lattice shape, and the cutout portions 48 of the shock absorbing ribs 45 are provided in the central region of the buffer member 44. For this reason, it is possible to suppress the occurrence of a crushing delay in the shock absorbing rib 45 in the central region of the buffer member 44, and the shock absorbing rib 45 can be uniformly and stably crushed throughout. Therefore, the load or impact load at the time of collision can be absorbed effectively. Moreover, as a configuration that exhibits such an effect, a dedicated component is not provided, so the number of components does not increase and the configuration is simple.
[0050]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment. In the description of each embodiment after the second embodiment, a description will be given focusing on a configuration different from the embodiment described before.
[0051]
In the second embodiment, as shown in FIG. 8, the longitudinal ribs of the shock absorbing ribs 45 are used as the restraining structures 47 for suppressing the grid-like shock absorbing ribs 45 from being crushed unevenly. The arrangement pitch P of the portions 45 c and the lateral rib portions 45 d is formed so as to gradually become wider in the central region of the buffer member 44. As a result, the arrangement density of the shock absorbing ribs 45 is configured so as to become coarser in the central region of the buffer member 44, and a load or a shock load at the time of collision is applied to the shock absorber 41 as in the case of the first embodiment. The shock absorbing ribs 45 of the respective buffer members 44 are crushed uniformly and stably.
[0052]
Therefore, according to the second embodiment, in addition to the effects described in (1) and (2) in the first embodiment, the following effects can be obtained.
(4) In the shock absorber 41 for a two-wheeled vehicle, the arrangement pitch P of the lattice-like shock absorbing ribs 45 is formed so as to be wider toward the center region of the buffer member 44. For this reason, the arrangement density of the shock absorbing ribs 45 in the central region of the buffer member 44 becomes coarse, the apparent hardness of the central region becomes soft, and the occurrence of a crushing delay in the shock absorbing ribs 45 is suppressed. Thus, the shock absorbing rib 45 can be uniformly and stably crushed throughout.
[0053]
(Third embodiment)
Next, in the third embodiment, as shown in FIGS. 9 to 16, as the suppression structure 47 for suppressing the non-uniform crushing of the shock absorbing rib 45, a buffer member as in the first embodiment. In the central region of 44, a cutout portion 48 of the shock absorbing rib 45 is formed. In addition, as shown in FIGS. 9 to 13, as the restraining structure 47, an open portion 50 where the shock absorbing rib 45 does not extend is formed on the outer peripheral edge of the buffer member 44. That is, in the configuration of the buffer member 44 of the first embodiment, the longitudinal rib portion 45c and the lateral rib portion 45d extending along the outer peripheral edge, and a part of the outer end portion of the shock absorbing rib 45 orthogonal to them. Are removed, and an open portion 50 opened outward is formed in the removed portions. Due to the configuration of the open portion 50, when a shock load or impact load is applied to the shock absorber 41, the shock absorbing rib 45 extending along the outer peripheral edge of the shock absorbing member 44 is caused to escape to the outside. Thus, it is possible to prevent a possibility that unbalance occurs in the buffer members 44 in the stacked state.
[0054]
That is, as shown in FIGS. 16A to 16C, the opening portion 50 is formed so that the substrate 46 protrudes outward from the outermost lattice opening So. It has become. The outermost lattice opening So refers to a portion where dots are displayed in the lattice opening So in FIG. Since the substrate 46 projects outward from the outermost lattice opening So, when the shock absorber 41 receives a load at the time of collision or an impact load, the substrate 46 as a whole first receives the load, and then The load can be dispersed on the shock absorbing rib 45.
[0055]
That is, the buffer members 44 are fixed to each other by bonding or the like, but when a large impact force is applied, the outermost shock absorbing ribs 45 constituting the outer peripheral wall in FIG. It moves to the outside of the door and easily falls off. When a part of the outer peripheral wall falls off, the strength balance is lost and the wall is crushed while tilting, and the buckling deformation occurrence load becomes unstable. Further, the inclined plate-shaped rib may be flipped off. By removing the outer peripheral wall, it is possible to absorb such an impact efficiently by breaking the balance even if a large impact is applied.
[0056]
As shown in FIG. 16A, even if the outer peripheral edge of the substrate 46 and the tip of the shock absorbing rib 45 substantially coincide with each other, or as shown in FIGS. May protrude beyond the tip of the shock absorbing rib 45. In order to ensure the rigidity of the substrate 46, the substrate 46 may be reinforced by appropriately providing a flange on the outer periphery of the substrate 46.
[0057]
Further, the protruding rib portions 45e do not need to extend from all the outermost lattice openings So, and there are several places where the protruding rib portions 45e are not formed from the intersections that form the outermost lattice openings So. There may be.
[0058]
In this embodiment, as shown in FIGS. 12 and 13, as the restraining structure 47, crossing portions on the base end 45 a side of the vertical and horizontal rib portions 45 c and 45 d of the shock absorbing rib 45 in each buffer member 44, and A plurality of meat stealing recesses 51 are formed in the corresponding portion of the substrate 46. That is, the meat stealing recess 51 has a shape in which the shock absorbing rib 45 is sandwiched from the back side of the substrate 46 at the intersection of the vertical and horizontal rib portions 45c and 45d. The formation of the meat stealing recess 51 facilitates the crushing of the crossing portion that is difficult to crush on the base end 45a side of the shock absorbing rib 45 when a collision load or impact load is received. An increase in buckling deformation generation load at the stage is suppressed.
[0059]
Furthermore, in this embodiment, as shown in FIGS. 12 to 14, as the restraining structure 47, a protrusion integrally formed on the outer peripheral portion of the back surface of the substrate 46 that is one of the stacked joint surfaces of the adjacent buffer members 44. The engagement structure of the piece 52 and the notch recessed part 53 formed in the front-end | tip of the shock absorption rib 45 which is the other is added. That is, a plurality of projecting pieces 52 are formed to protrude along the outer peripheral edge of the back surface of the substrate 46 of each buffer member 44. In addition, a plurality of notch recesses 53 are formed at the tip 45 b of the shock absorbing rib 45 of each buffer member 44 so as to correspond to the protruding piece 52. Then, in a state where the plurality of buffer members 44 are stacked, the notch recess 53 is externally fitted to the projecting piece 52, and the projecting piece 52 and the notch recess 53 are engaged with each other. Misalignment in the orthogonal direction is prevented.
[0060]
In addition, in this 3rd Embodiment, although the hollow part 48, the open part 50, the meat stealing recessed part 51, the protrusion 52, and the notch recessed part 53 were provided as the suppression structure 47, at least 1 structure of these is provided. If it is provided, an impact absorbing function can be obtained. Moreover, you may combine two or more suitable things arbitrarily among these structures.
[0061]
Therefore, according to the third embodiment, in addition to the effects described in (1) to (3) in the respective embodiments, the following effects can be obtained.
(5) In the shock absorber 41 for a motorcycle, as the restraining structure 47, an open portion 50 where the shock absorbing rib 45 does not extend is formed on the outer peripheral edge of the buffer member 44. For this reason, since the shock absorbing ribs 45 are not extended on the outer peripheral edge of the shock absorbing member 44 where the shock absorbing ribs 45 are likely to escape to the outside, the shock absorbing ribs 45 are unbalanced in a stacked state. It is possible to reliably prevent the occurrence of the collision and to effectively absorb the collision energy.
[0062]
(6) In this shock absorber 41 for a motorcycle, as the restraining structure 47, engagement between a projecting piece 52 formed on one side of the stacking joint surface of the buffer member 44 and a notch recess 53 formed on the other side. Configuration is added. For this reason, with the engagement configuration of the protruding piece 52 and the notch recess 53, it is possible to reliably prevent the occurrence of positional deviation in the direction perpendicular to the stacking direction in the plurality of buffer members 44 in the stacked state. Thus, the shock absorbing ribs 45 can be uniformly and stably crushed throughout, and the collision energy can be effectively absorbed as described above.
[0063]
Further, in this shock absorber 41 for a motorcycle, since the meat stealing concave portion 51 is provided as the restraining structure 47, it is possible to reliably crush the intersecting portion of the longitudinal and lateral rib portions 45c and 45d that are inherently difficult to crush. And shock absorption can be performed reliably.
[0064]
(Fourth embodiment)
Next, in the fourth embodiment, as shown in FIGS. 17 and 18, the restraining structure 47 has the following configuration instead of the engagement configuration of the projecting piece 52 and the notch recess 53 of the third embodiment. Is provided. That is, in the fourth embodiment, the engagement portion 54 formed on one of the stacking joint surfaces that is the back surface of the substrate 46 of the buffer member 44 and the engagement formed on the tip of the shock absorbing rib 45 that is the other. A locking structure with the pawl 55 is provided. That is, a plurality of engaging portions 54 having engaging holes 54 a are formed on the surface of the substrate 46 of each buffer member 44 along the outer peripheral edge thereof. In addition, a plurality of locking claws 55 are formed at the tip 45 b of the shock absorbing rib 45 of each buffer member 44 so as to correspond to the engaging portion 54. Then, in a state in which the plurality of buffer members 44 are stacked, the engaging holes 54 a and the locking claws 55 of the engaging portions 54 are engaged with each other at the opposing stacked joint surfaces, and the buffer members 44 Misalignment in the direction perpendicular to the stacking direction is prevented.
[0065]
Therefore, according to this 4th Embodiment, in addition to the effect as described in (1)-(3) and (5) in each said embodiment, the following effects can be acquired.
(7) In this shock absorber 41 for a two-wheeled vehicle, the position of the plurality of buffer members 44 in the stacked state in a direction orthogonal to the stacking direction is achieved by the locking configuration of the engaging portion 54 and the locking claw 55. It is possible to reliably prevent the possibility of deviation. Therefore, the shock absorbing rib 45 can be uniformly and stably crushed throughout.
[0066]
(Fifth embodiment)
Next, in the fifth embodiment, as shown in FIGS. 19 and 20, as the restraining structure 47, instead of the engagement configuration of the projecting piece 52 and the notch recess 53 of the third embodiment, the insertion hole 57. , 58 and a pin 59 are added. That is, a plurality of protruding pieces 56 are formed along the outer peripheral edge of the outer peripheral portion of the back surface of the substrate 46 in each buffer member 44, and insertion holes 57 are formed in these protruding pieces 56. A plurality of insertion holes 58 are also formed at the tip 45 b of the shock absorbing rib 45 of each buffer member 44 so as to correspond to the insertion hole 57. Then, in a state where the plurality of buffer members 44 are stacked, the pin 59 is inserted into both the insertion holes 57 and 58 in a press-fitted state, so that the displacement of the buffer members 44 in the direction perpendicular to the stacking direction is shifted. It is to be prevented.
[0067]
Therefore, according to the fifth embodiment, the following effects can be obtained in addition to the effects described in (1) to (3) and (5) in the respective embodiments.
(8) In this shock absorber 41 for a motorcycle, due to the coupling structure composed of the insertion holes 57 and 58 and the pin 59, the plurality of buffer members 44 in the stacked state are displaced in the direction perpendicular to the stacking direction. The possibility of occurrence can be prevented more reliably. Therefore, the shock absorbing rib 45 can be uniformly and stably crushed throughout.
[0068]
(Sixth embodiment)
Next, in the sixth embodiment, as shown in FIGS. 21 to 23, as the suppression structure 47, as in the second embodiment, the arrangement pitch P of the shock absorbing ribs 45 is closer to the central region of the buffer member 44. It is formed to be wide. In addition, similarly to the third embodiment, an open portion 50 where the shock absorbing rib 45 does not extend is formed on the outer peripheral edge of the buffer member 44.
[0069]
Further, in addition to these structures, a convex surface 60 is formed at the center of the substrate 46 constituting one of the stacked joint surfaces of the buffer member 44 as the suppression structure 47. Moreover, the concave surface 61 is formed in the center of the front-end edge of the impact-absorbing rib 45 which comprises the other of the stacking joint surfaces as the suppression structure 47. The convex surface 60 and the concave surface 61 have a low quadrangular frustum shape, and have a male-female engagement relationship. Then, in a state where the plurality of buffer members 44 are stacked, the displacement of the buffer members 44 in the direction perpendicular to the stacking direction, that is, the lateral shift is prevented by the engagement between the convex surface 60 and the concave surface 61. It has become.
[0070]
Therefore, according to the sixth embodiment, in addition to the effects described in (1) to (5) in each of the embodiments, the following effects can be obtained.
(9) In the shock absorber 41 for a motorcycle, due to the engagement configuration of the convex surface 60 and the concave surface 61, the plurality of buffer members 44 in the stacked state are displaced in the direction orthogonal to the stacking direction. The fear can be surely prevented. Therefore, the shock absorbing rib 45 can be uniformly and stably crushed over the whole, and collision energy can be effectively absorbed.
[0071]
(Seventh embodiment)
Next, in the seventh embodiment, as shown in FIGS. 24 and 25, the shapes of the convex surface 60 and the concave surface 61 as the suppression structure 47 are different from those in the sixth embodiment. That is, a low square columnar concave surface 61 is formed at the center of the substrate 46 of each buffer member 44, and a low square columnar convex surface 60 that forms a sex with the concave surface 61 is formed at the center on the tip 45b side of the shock absorbing rib 45. Has been.
[0072]
Therefore, also in the seventh embodiment, the same effects as the effects described in (1) to (5) and (9) in each of the embodiments can be obtained.
(Eighth embodiment)
Next, in the eighth embodiment, as shown in FIGS. 26 and 27, the shapes of the convex surface 60 and the concave surface 61 as the suppression structure 47 are different from those in the sixth embodiment. That is, a low quadrangular pyramid-shaped convex surface 60 is formed on the entire substrate 46 of each buffer member 44, and a low quadrangular pyramid-shaped concave surface 61 that forms a sex with the convex surface 60 on the entire tip 45b side of the shock absorbing rib 45. Is formed. The apexes of these quadrangular pyramids are located at the center of the substrate 46 and the shock absorbing rib 45.
[0073]
Therefore, also in the eighth embodiment, the same effects as those described in (1) to (5) and (9) in each of the above embodiments can be obtained.
(Ninth embodiment)
Next, in the ninth embodiment, as shown in FIG. 28, the shapes of the convex surface 60 and the concave surface 61 as the suppression structure 47 are different from those in the sixth embodiment. That is, a spherical convex surface 60 is formed on the entire substrate 46 of each buffer member 44, and a spherical concave surface 61 that forms a sex with the convex surface 60 is formed on the entire tip 45 b side of the shock absorbing rib 45. .
[0074]
Therefore, also in the ninth embodiment, the same effects as those described in (1) to (5) and (9) in each of the above embodiments can be obtained.
(10th Embodiment)
Next, in the tenth embodiment, as shown in FIG. 29 and FIG. 30, the restraining structure 47 is replaced with a plurality of engagements instead of the engagement configuration of the projecting piece 52 and the notch recess 53 of the third embodiment. An engagement configuration between the protrusion 62 and the engagement hole 63 is provided. That is, a plurality of engagement protrusions 62 are formed at the intersections on the front end 45 b side of the shock absorbing rib 45 in each buffer member 44. Further, a plurality of engagement holes 63 that can be engaged with the engagement protrusions 62 are formed in the intersecting portion of the shock absorbing rib 45 on the base end 45a side and the substrate 46 corresponding thereto. Then, in a state where the plurality of buffer members 44 are stacked, the plurality of engagement protrusions 62 are engaged with the engagement holes 63, thereby preventing displacement of the buffer members 44 in the direction perpendicular to the stacking direction. It has become so.
[0075]
Accordingly, also in the tenth embodiment, substantially the same effects as those described in (1) to (6) in each of the above embodiments can be obtained.
(Eleventh embodiment)
Next, in the eleventh embodiment, as shown in FIG. 31 and FIG. 32 and FIG. 6C, as the restraining structure 47, a thin film-like flexible sheet is provided on the outer periphery of the buffer member 44 in a stacked state. A position restricting member 64 is wound in a tension state. Then, by overlapping the end edges of the position restricting member 64 and thermally welding the overlapped end edges 44a, the position restricting member 64 is joined and fixed to the buffer member 44 with almost no gap in a wound and wrapped state. ing. The position restricting member 64 is, for example, a synthetic resin film such as PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), etc., having a thickness of 5 to 500 μm, a tensile strength of 3 N (Newton) / mm or more, and an elongation of 100. It is preferable to use a thing more than%.
[0076]
Due to the winding arrangement of the position restricting member 64, the displacement of the buffer member 44 in the direction orthogonal to the stacking direction is prevented. That is, the position restricting member 64 integrally covers all the buffer members 44 to prevent the position of each buffer member 44 from being displaced, but the position restricting member 64 has flexibility and flexibility. The crushing of the buffer member 44 can be followed. Therefore, as shown in FIG. 6C, the position regulating member 64 allows the buffer member 44 to be crushed while preventing the buffer member 44 from being displaced. Therefore, the shock absorbing rib 45 can be uniformly and stably crushed throughout, and shock absorption can be effectively performed. In addition, since each buffer member 44 is wrapped by the position regulating member 64 in a stacked state and maintained in that state, adhesion between the buffer members 44 is unnecessary.
[0077]
Therefore, according to the eleventh embodiment, the following effects can be obtained in addition to the effects described in (1) to (5) in the respective embodiments.
(10) In this shock absorber 41 for a motorcycle, the restraining structure 47 is a position restricting member made of a thin film-like flexible sheet that is wound around the outer periphery of a plurality of stacked cushioning members 44 and joined. 64. For this reason, the arrangement of the position restricting member 64 can reliably prevent the positional shift in the direction orthogonal to the stacking direction from occurring in the plurality of buffer members 44 in the stacked state. Can be uniformly and stably crushed throughout.
[0078]
In the eleventh embodiment, an adhesive may be applied to the entire inner surface or a part of the position regulating member 64. By doing so, the position restricting member 64 can be brought into close contact with the buffer member 44 without any gap, which is further advantageous for the above-described stable crushing.
[0079]
(Twelfth embodiment)
Next, in the twelfth embodiment, as shown in FIG. 33, the position regulating member 64 is formed in a cylindrical shape by a heat shrink film. The position restricting member 64 is heated and shrunk in a state where the position restricting member 64 is fitted around the outer periphery of all the stacked buffer members 44, and is joined and fixed to the outer periphery of the buffer member 44 in a tension state. Therefore, in the second embodiment, the buffer member 44 is securely held by the position restricting member 64.
[0080]
Therefore, also in the twelfth embodiment, the same effects as those described in (1) to (5) and (10) in each of the above embodiments can be obtained.
(13th Embodiment)
Next, in the thirteenth embodiment, as shown in FIGS. 34 and 35, a plurality of shock absorbing ribs 45 in each buffer member 44 are formed in an independent cylindrical shape without intersecting, and the thickness thereof is the base end 45a. It is formed so as to become gradually thinner from the tip toward the tip 45b. In addition, on the surface of the substrate 46 of each buffer member 44, an engagement recess 66 as a suppression structure 47 is formed corresponding to each cylindrical shock absorbing rib 45. Then, in a state where the plurality of buffer members 44 are stacked, the tip 45b of each shock absorbing rib 45 is engaged with the engagement recess 66, so that the position shift of the buffer member 44 is prevented.
[0081]
Therefore, also in the thirteenth embodiment, it is possible to obtain substantially the same effects as the effects described in (1) to (6) in each of the embodiments.
(14th Embodiment)
Next, in the fourteenth embodiment, as shown in FIG. 36, the shock absorbing ribs 45 of the respective buffer members 44 are formed so as to intersect with a hexagonal shape so as to form a honeycomb shape without intersecting with a lattice shape. Has been.
[0082]
Therefore, also in the fourteenth embodiment, it is possible to obtain substantially the same effects as in the above embodiments.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
[0083]
In each of the above embodiments, the shock absorbing ribs 45 of the buffer member 44 are formed so as to intersect with different polygonal shapes such as a triangular shape in addition to the lattice shape and the hexagonal shape.
[0084]
In the thirteenth embodiment shown in FIG. 35 and FIG. 36, the shock absorbing rib 45 having an independent configuration is formed in a polygonal cross section such as a square tube.
In each of the embodiments, the shape, size, thickness, etc. of the shock absorbing rib 45 and the substrate 46 of the buffer member 44 are arbitrarily changed according to the assumed load at the time of collision or the magnitude of the impact load. .
[0085]
In each of the above embodiments, the shock absorbing ribs 45 are formed in a lattice shape by the vertical and horizontal rib portions 45c and 45d.
[0086]
A synthetic resin such as urethane is applied to the outer peripheral surface of the buffer member 44 in a stacked state by spraying or the like, and the position regulating member having substantially the same function as that of the eleventh and twelfth embodiments is configured by the synthetic resin. thing.
[0087]
In the eleventh and twelfth embodiments, the position regulating member 64 or 65 is provided in a plurality of layers with respect to the buffer member 44.
-The shock absorber 44 should be configured so as to have a stepped shape as the entire shock absorber 41 as the shock absorbing member 44 is smaller in size toward the front side of the motorcycle.
[0088]
A combination of the suppression structure 47 using the position restriction member of the 11th to 12th embodiments and at least one suppression structure 47 of the other embodiments.
-In 6th, 7th embodiment, the convex surface 60 and the concave surface 61 which comprise the suppression structure 47 are each provided in multiple numbers on one stacking junction surface.
[0089]
【The invention's effect】
As described above in detail, the present invention exhibits an excellent effect that it can be easily attached to the front part of a motorcycle with a small attachment area and can absorb and efficiently absorb a large impact at the time of collision. To do.
[Brief description of the drawings]
FIG. 1 is a front view showing a motorcycle equipped with a shock absorber according to a first embodiment.
2 is an enlarged schematic perspective view of the shock absorber shown in FIG. 1. FIG.
FIG. 3 is an enlarged cross-sectional view of the shock absorber shown in FIG.
4 is an exploded perspective view of a main part of the shock absorber shown in FIG.
FIG. 5 is a partial cross-sectional view showing a part of FIG. 3 in an enlarged manner.
FIGS. 6A, 6B, and 6C are explanatory views showing the state of an impact test of an impact absorber, respectively.
FIGS. 7A and 7B are graphs showing the relationship between the buckling deformation occurrence load and the displacement of the shock absorber, respectively.
FIG. 8 is a side view showing a shock absorber according to a second embodiment.
FIG. 9 is a perspective view showing a shock absorber according to a third embodiment.
10 is a cross-sectional view of the shock absorber shown in FIG.
11 is a side view of the shock absorber shown in FIG. 9. FIG.
12 is a perspective view showing the buffer member in FIG. 11;
13 is a perspective view showing the buffer member of FIG. 11 in a state where the substrate is removed. FIG.
14 is a partially enlarged cross-sectional view showing an assembled state of the buffer member of FIG.
15 is an explanatory view showing a state of an impact test related to the shock absorber shown in FIG. 9;
FIGS. 16A, 16B, and 16C are schematic views showing different shapes of the shock absorber shown in FIG. 9 respectively.
FIG. 17 is a perspective view showing a shock absorber of the shock absorber according to the fourth embodiment.
18 is a partially enlarged cross-sectional view showing an assembled state of the buffer member of FIG. 17;
FIG. 19 is a perspective view showing a shock absorbing member of a shock absorber according to a fifth embodiment.
20 is a partially enlarged cross-sectional view showing an assembled state of the buffer member of FIG. 19;
FIG. 21 is a schematic front view showing a shock absorber according to a sixth embodiment.
22 is an enlarged cross-sectional view of a main part of the shock absorber shown in FIG. 21. FIG.
23 is an enlarged side view of the shock absorber shown in FIG. 21. FIG.
FIG. 24 is a schematic front view showing a shock absorber according to a seventh embodiment.
25 is a schematic side view of the shock absorber shown in FIG. 24. FIG.
FIG. 26 is a schematic front view showing a shock absorber according to an eighth embodiment.
27 is a schematic side view of the shock absorber shown in FIG. 26. FIG.
FIG. 28 is a schematic front view showing a shock absorber according to a ninth embodiment.
FIG. 29 is a partial perspective view showing a shock absorber of the shock absorber according to the tenth embodiment.
30 is a partially enlarged cross-sectional view showing the assembled state of the buffer member of FIG. 28. FIG.
FIG. 31 is a schematic sectional view showing an impact absorber according to an eleventh embodiment.
32 is a schematic side view of the shock absorber shown in FIG. 31. FIG.
FIG. 33 is a schematic side view showing a shock absorber according to a twelfth embodiment.
FIG. 34 is a side view showing a shock absorber according to a thirteenth embodiment.
35 is a partially enlarged cross-sectional view of the shock absorber shown in FIG. 34. FIG.
FIG. 36 is a side view showing a shock absorber according to a fourteenth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 41 ... Shock absorber, 43 ... Two-wheeled vehicle, 44 ... Buffering member, 45 ... Shock absorption rib, 45a ... Base end, 45b ... Tip, 46 ... Substrate, 47 ... Suppression structure as suppression means, 48 ... Thinning part ... Open portion, 52 ... Projection piece, 53 ... Notched recess, 54 ... engaging portion, 55 ... locking claw, 57,58 ... insertion hole, 59 ... pin, 60 ... convex surface, 61 ... concave surface, 62 ... engaging projection , 63 ... engagement holes, 64 and 65 ... position regulating members, 66 ... engagement recesses, T1 ... wall thickness at the base end, T2 ... wall thickness at the tip, P ... arrangement pitch of the shock absorbing ribs.

Claims (15)

Provided with a plurality of synthetic resin cushioning members formed with a plurality of shock absorbing ribs, and stacking the buffering members so that the direction from the base end to the tip of the shock absorbing ribs is the vehicle longitudinal direction of the motorcycle. A shock absorber for a motorcycle that is attached to the front of the motorcycle,
When receiving a load at the time of impact or an impact load, a suppression means is provided for suppressing the shock absorbing ribs from being crushed unevenly ,
The suppressing means is formed of a fitting structure formed on one of the stacking joint surfaces of adjacent buffer members and protruding in the stacking direction, and a concave surface formed on the other and recessed in the stacking direction. Shock absorber for motorcycles.   2. The shock absorber for a motorcycle according to claim 1, wherein the shock absorbing ribs are formed in a lattice shape.   The shock absorber for a motorcycle according to claim 1 or 2, wherein the shock absorbing rib is formed so that the thickness gradually decreases from the base end to the tip end.   4. The shock absorber for a motorcycle according to claim 1, wherein each of the buffer members includes a substrate and the shock absorbing rib formed integrally with the substrate. 5.   The said suppressing means consists of the structure which made the arrangement | positioning density of an impact-absorbing rib roughen the center area | region of a buffer member rather than an outer peripheral area, The Claim 1 characterized by the above-mentioned. Shock absorber for motorcycles.   The said suppression means consists of the structure which open | released the outer peripheral side of the buffer member by arrange | positioning an impact-absorbing rib so that it may not exist in the outer periphery of a buffer member, The any one of Claims 1-5 characterized by the above-mentioned. The shock absorber for a motorcycle according to one item.   The said suppression means consists of the latching structure of the engaging part formed in one of the stacking joint surfaces of an adjacent buffer member, and the latching claw formed in the other. The shock absorber for a motorcycle according to any one of Items 6.   The said suppression means is formed in both of the stacking junction surfaces of an adjacent buffer member, respectively, and consists of the insertion hole corresponding to each other, and the pin penetrated by those corresponding insertion holes. The shock absorber for a motorcycle according to any one of claims 7 to 10. The shock absorber for a motorcycle according to any one of claims 1 to 8, wherein the convex surface and the concave surface are formed in a central portion of the stacked joint surface . The shock absorber for a motorcycle according to any one of claims 1 to 8, wherein the convex surface and the concave surface are formed on the entire stacked joint surface. The suppressing means is a position restricting member made of a flexible sheet that is disposed on the outer peripheral surface of the plurality of buffer members in a stacked state, and the position of the buffer member is restricted so as not to be displaced . The shock absorber for a motorcycle according to any one of claims 1 to 10 . Wherein the position regulating member, motorcycle shock absorber according to claim 1 1, wherein the forming a cylindrical shape. The shock absorber for a motorcycle according to claim 11 or 12, wherein the position restricting member is in close contact with the outer peripheral surface of the buffer member . Wherein the position regulating member, motorcycle shock absorber according to claim 1 1 or 1 2 is characterized in that adhesive is applied on the inner surface. Wherein the position regulating member, motorcycle shock absorber according to any one of claims 1 1 to claim 1 4 characterized by consisting of heat-shrinkable film.

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