JP4529663B2 - Opening / closing door cushion - Google Patents

Description

  The present invention relates to an opening / closing door cushion applied to an automobile or the like, and more particularly to an opening / closing door cushion for reducing impact noise and vibration when closing an opening / closing lid.

2. Description of the Related Art Conventionally, an opening / closing door shock absorber for reducing impact sound and vibration when an engine hood is closed is known (see, for example, Patent Document 1). In this technique, a buffer rod and a buffer member are disposed in a hollow portion of a cushion member that is attached to the upper part of the upper member and elastically contacts the hood inner panel, and the buffer member is fixed to the upper part of the upper member from below. It is supported by a buffer member housing.
Japanese Patent Laid-Open No. 10-305782

  In the open / close door cushion of Patent Document 1, when the hood is closed, the buffer member is compressed between the buffer rod of the open / close door buffer device and the buffer member housing. However, in this open / close door cushion, when a colliding body collides with the hood and a closing direction force greater than a predetermined value of the hood acts on the cushioning member, no further cushioning action is possible with the maximum cushioning stroke of the cushioning member. It becomes. For this reason, collision energy cannot be absorbed even if a gap is left between the hood and the upper member.

  In view of the above-described facts, an object of the present invention is to provide an open / close door cushion that can effectively improve the collision energy absorption performance by effectively using the gap between the open / close lid and the mounting member.

According to the first aspect of the present invention, in the opening / closing door cushion which is supported by the mounting member and elastically supports the opening / closing door at the tip of the protruding portion protruding from the mounting member, the opening / closing door is closed more than a predetermined value. A cylindrical portion that is pushed into the mounting member by a directional force to change the projecting height of the projecting portion, and that the end on the projecting portion side is elastically deformed radially outward by a closing direction force of the door; It is supported in a cylinder part, receives the closing direction force in a state where the cylinder part is opened, and is elastically compressed and deformed in the closing direction of the opening / closing door by a closing direction force equal to or greater than a predetermined value of the opening / closing door, thereby further increasing the closing direction force. And a shaft portion at which a support position to the cylindrical portion is changed .

When a closing direction force greater than the predetermined value of the door is applied to the door cushion, the door cushion absorbs collision energy when the door cushion is pushed into the mounting member and the protrusion height of the protrusion decreases. . Further, when a closing direction force of the opening / closing door is applied to the opening / closing door cushion, the end portion on the protruding portion side of the cylindrical portion is elastically deformed radially outward. In addition, when a closing direction force of the opening / closing door is applied in a state where the cylinder portion is open, the shaft portion is elastically compressed and deformed in the closing direction of the opening / closing door. Further, when a closing direction force greater than or equal to a predetermined value of the opening / closing door acts on the opening / closing door cushion, the support position of the shaft portion supported in the cylinder portion changes. Further, the collision energy is absorbed when the support position of the shaft portion changes.

According to a second aspect of the present invention, in the open / close door cushion that is supported by the mounting member and elastically supports the open / close door at the tip of the protruding portion protruding from the mounting member, the open / close door is closed more than a predetermined value. While being pushed into the mounting member by directional force and changing the protruding height of the protruding portion,
A cylindrical portion that elastically compresses and deforms in the closing direction of the opening and closing door with a closing direction force equal to or greater than a predetermined value of the opening and closing door, and breaks with a larger closing direction force;
A shaft portion that is disposed in the tube portion and is fixed at both ends in the axial direction of the tube portion, and elastically deforms in the closing direction of the door by a closing direction force that is equal to or greater than a predetermined value of the door.
It is characterized by having.

When a closing direction force greater than the predetermined value of the door is applied to the door cushion, the door cushion absorbs collision energy when the door cushion is pushed into the mounting member and the protrusion height of the protrusion decreases. . In addition, when a closing direction force greater than a predetermined value of the opening / closing door is applied to the opening / closing door cushion, the shaft portion and the cylindrical portion are elastically compressed and deformed in the closing direction of the opening / closing door, and a larger closing direction force is applied. In the case, the collision energy is absorbed by the tube portion being broken.

According to the first aspect of the present invention, the opening / closing door cushion can effectively improve the collision energy absorption performance by changing the gap between the opening / closing lid and the mounting member, and the shaft support position can be changed. Can further absorb the collision energy.

According to the second aspect of the present invention, it is possible to improve the collision energy absorption performance by effectively utilizing the gap between the opening / closing lid and the mounting member, and to further improve the collision energy by deforming the cylindrical portion and the shaft portion. Can be absorbed.

1st Embodiment as a reference example of the cushion for doors not included in this invention is described according to FIGS.

  In the figure, the arrow UP indicates the vehicle body upward direction, the arrow FR in the figure indicates the vehicle body front direction, and the arrow IN in the figure indicates the vehicle width inside direction.

  As shown in FIG. 4, in this embodiment, an apron upper member 12 as an attachment member is attached to the front portion 10 </ b> A of the body 10 of the automobile along the longitudinal direction of the vehicle body. The front portion 10 </ b> A is attached to both upper ends in the vehicle width direction. Further, a radiator support upper 14 is installed on the front end portion of the apron upper member 12.

  A positioning hood cushion 16 serving as an opening / closing door cushion is attached to the front upper portion of the apron upper member 12. Further, a hood 20 as an opening / closing lid is attached to the upper part of the apron upper member 12 via a hinge disposed at the rear end portion, so that the engine room 22 can be opened and closed.

  As shown in FIG. 1, the hood 20 includes a hood outer panel 24 that constitutes the upper portion of the hood 20 and a hood inner panel 26 that constitutes the lower portion of the hood 20, and an outer peripheral edge 24 </ b> A of the hood outer panel 24 and the hood inner. The outer peripheral edge portion 26A of the panel 26 is coupled to each other by femming.

  As shown in FIG. 3, a hole 30 is formed in the upper wall portion 12 </ b> A of the apron upper member 12 by press molding, and a notch 32 extending along the radial direction of the hole 30 is formed in the peripheral portion of the hole 30. Is formed in one place.

  Further, the peripheral edge portion of the hole 30 is inclined so as to gradually become lower from one peripheral edge portion 32A facing the notch 32 to the other peripheral edge portion 32B. Thus, one round of the female screw is formed at the peripheral portion of the hole 30. Therefore, the hood cushion 16 can be screwed into the hole 30 through the notch 32.

  Further, the hood cushion 16 is made of an elastic member such as a columnar rubber or resin, and the outer circumferential portion 16A has screw grooves 34 at a predetermined pitch around the axis of the hood cushion 16 over the entire length of the hood cushion 16. A screw thread 36 is formed between the screw grooves 34.

  As shown in FIG. 1, the screw groove 36 of the hood cushion 16 is screwed into the hole 30 of the apron upper member 12, and the screw groove of the hood cushion 16 is larger than the plate thickness M1 of the hole 30 of the apron upper member 12. The groove width W1 of 36 (distance between adjacent screw threads 36 in the axial direction of the hood cushion 16) is slightly smaller. For this reason, strong tension is generated between the peripheral edge of the hole 30 of the apron upper member 12 and the screw thread 36 of the hood cushion 16, the hood cushion 16 does not loosen during normal use, and the load during screwing work is large. It's just a relationship. Further, the plate thickness M1 that can be screwed by the groove width W1 can have a predetermined allowable range. That is, the hood cushion 16 can be screwed even when the plate thickness M1 is slightly different.

  The hood cushion 16 is attached to the apron upper member 12 by screwing the screw groove 34 and the screw thread 36 into the hole 30 of the apron upper member 12. The upper end portion 16C of the hood cushion 16 abuts on the lower surface 26B of the hood inner panel 26 when the hood 20 is in the closed state, and the hood cushion 16 is elastically deformed in the axial direction.

  The height H1 of the protrusion of the hood cushion 16 from the apron upper member 12 can be adjusted by the amount of screwing of the lower end portion 16B of the hood cushion 16 into the apron upper member 12.

  Further, the screw thread 36 is formed by a square screw having a square cross section, and a concave portion 40 is continuously formed in the circumferential direction along the screw thread 36 in the root portion 36A of the screw thread 36. The depth direction of the recess 40 is parallel to the axis of the hood cushion 16 from the lower end side to the upper end side of the screw thread 36, and the recess 40 has a cross-sectional area of the root portion 36 </ b> A of the screw thread 36. By making it small, the root portion 36A is easily broken as compared with other portions of the screw thread 36, and is a weak portion that undergoes plastic deformation such as fracture.

  For this reason, the screw thread 36 does not plastically deform until the closing direction force of the hood 20 acting on the hood cushion 16 from the upper side to the lower side of the vehicle body reaches a predetermined value. The plastic deformation starts at 40.

  As shown in FIG. 1, a gap 35 is formed between the bottom 34 </ b> A of the screw groove 34 of the hood cushion 16 and the inner peripheral portion 30 </ b> A of the hole 30, and a screw thread 36 that is plastically deformed in the gap 35. Can pass through.

  Accordingly, as shown in FIG. 2, the collision body collides with the hood 20 from the upper side to the lower side of the vehicle body, and the closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 16 from the upper side to the lower side of the vehicle body. In this case, the screw thread 36 on the upper side of the vehicle body that contacts the peripheral edge of the hole 30 of the apron upper member 12 is plastically deformed upward starting from the recess 40, and the hood is formed with respect to the hole 30 of the apron upper member 12. The cushion 16 moves downward (arrow A in FIG. 2).

  That is, when a closing direction force K greater than a predetermined value of the hood 20 is applied to the hood cushion 16, by changing the screwing position between the hole 30 of the apron upper member 12 and the screw thread 36, the apron upper member 12 is moved. The support position of the hood cushion 16 changes, and the height H1 of the protruding portion gradually decreases. Further, the screw thread 36 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20.

  Next, the operation of this embodiment will be described.

  In the present embodiment, when the hood 20 is closed, a protruding portion (a portion having a height H1) protruding from the apron upper member 12 of the hood cushion 16 is elastically deformed by the closing direction force of the hood 20. As a result, as shown in FIG. 5, the relationship between the stroke S of the hood 20 and the force F received by the hood 20 from the hood cushion 16 is an increase in the stroke S as shown in (0 to S1, 0 to F1). On the other hand, the force F increases gradually. For this reason, since the force F is small with respect to the stroke S when the hood 20 is normally closed, the hood 20 can be easily closed.

  Further, when the hood 20 is strongly closed, the protruding portion of the hood cushion 16 is greatly elastically deformed. As a result, as shown in FIG. 5 (0 to S2, 0 to F2), the force F rises gently with respect to the increase of the stroke S and then rises rapidly. For this reason, since the stroke S becomes small with respect to the force F when the hood 20 is strongly closed, the hood 20 can be prevented from interfering with other parts attached below the hood 20.

  Further, when the collision body contacts the hood 20 from the upper direction of the vehicle body toward the lower side of the vehicle body, the protruding portion of the hood cushion 16 is further elastically deformed by the closing direction force of the hood 20. As a result, as shown in FIG. 5 (0 to S3, 0 to F3), the force F rises gently with respect to the increase of the stroke S, and then suddenly rises. The amount of energy absorbed by the hood cushion 16 when the body comes into contact can be increased.

  Further, when a closing direction force K greater than a predetermined value of the hood 20 is applied to the hood cushion 16 due to the collision of the collision body, the upper side of the hood cushion 16 that contacts the peripheral edge of the hole 30 of the apron upper member 12 The screw thread 36 is plastically deformed upward from the concave portion 40 in order from the lower side to the upper side, and passes through the hole 30. As a result, the hood cushion 16 moves downward (arrow A in FIG. 2) one after another with respect to the hole 30 of the apron upper member 12.

  As a result, as shown in FIG. 5 (S3 to S4), the force F repeats a slight vertical movement with respect to the increase of the stroke S, but does not increase greatly. For this reason, since the force F when the collision body contacts the hood 20 is substantially constant and the stroke S increases, the amount of energy absorbed when the collision body collides can be increased.

  That is, as shown by a two-dot chain line in FIG. 5, the bottom of the hood cushion 16 (limit of elastic deformation) can prevent the stroke S5 from being shortened and the force F5 received by the collision body from being increased. For this reason, the clearance H1 between the hood 20 and the apron upper member 12 can be effectively used to improve the collision energy absorption performance.

  Further, in the present embodiment, since the concave portion 40 is formed in the root portion 36A of the screw thread 36 to form a fragile portion, the screw thread 36 is applied when a closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 16. Since the root portion 36A of the wing is reliably deformed starting from the recess 40, the collision energy can be reliably absorbed.

  In the present embodiment, the hood cushion 16 can be easily attached to the apron upper member 12 by screwing the screw groove 34 and the screw thread 36 of the hood cushion 16 into the hole 30 of the apron upper member 12.

Next, 2nd Embodiment as a reference example of the cushion for doors not included in this invention is described according to FIGS.

  In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 6, in the present embodiment, the gap H2 between the hood 20 and the apron upper member 12 is larger than that in the first embodiment.

  The hood cushion 16 is composed of two materials having different longitudinal elastic coefficients. That is, the longitudinal elastic modulus of the material constituting the shaft portion 50 of the hood cushion 16 is higher than the longitudinal elastic modulus of the material constituting the screw portion 52 of the hood cushion 16 and is difficult to deform.

  The shaft portion 50 of the hood cushion 16 has a cylindrical shape, and the screw portion 52 is fixed to the outer periphery of the central portion of the shaft portion 50 in the vertical direction by integral molding, adhesion, or the like. Similarly to the first embodiment, a screw groove 34 and a screw thread 36 are formed on the outer peripheral portion 52A of the screw portion 52, and the screw groove 34 of the hood cushion 16 is screwed into the hole 30 of the apron upper member 12. Match.

  The lower end 50A of the shaft portion 50 has a conical shape, and a plurality of grooves 54 formed in an annular shape around the shaft are spaced apart from each other at predetermined intervals in the axial direction in the outer peripheral portion near the lower end 50A (in this embodiment). 2) are formed. Further, the depth direction of the groove 54 is inclined from the upper side to the lower side from the outer peripheral side of the shaft portion 50 toward the shaft center side of the shaft portion 50, and thereby the shaft portion 50 between the adjacent grooves 54. Has wings 56.

  A receiving bracket 60 is attached to the lower surface 12 </ b> B of the apron upper member 12. The receiving portion bracket 60 has an inverted conical shape with a gradually decreasing diameter on the lower side, and a circular hole 62 is formed at the lower end portion. A flange 60 </ b> A is formed outward at the upper end of the receiving bracket 60, and the flange 60 </ b> A is welded to the lower surface 12 </ b> B of the apron upper member 12.

  Note that the size of the hole 62 is smaller than the diameter of the wing portion 56 of the shaft portion 50 in the hood cushion 16, and when the hood cushion 16 moves downward, the hood cushion is formed in the peripheral portion 60 </ b> B of the hole 62. The wing portions 56 of the sixteen shaft portions 50 come into contact with each other.

  As shown in FIG. 7, when a collision body abuts on the hood 20 and a closing direction force K equal to or greater than a predetermined value of the hood 20 acts on the hood cushion 16 from the upper side to the lower side of the vehicle body, the first embodiment is performed. Similarly, since the outer diameter of the screw portion 52 is reduced by plastic deformation of the screw thread 36, the screw portion 52 passes through the hole 30 of the apron upper member 12, and the hole 30 of the apron upper member 12 and the hood cushion 16 The position of engagement with the screw groove 36 is shifted. Further, the screw thread 36 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20.

  Further, when the engagement between the hole 30 of the apron upper member 12 and the screw groove 36 of the hood cushion 16 is released, the wing portion 56 of the shaft portion 50 of the hood cushion 16 is formed on the peripheral edge portion 60B of the hole 62 of the receiving portion bracket 60. When a larger closing direction force K is applied, the wing portion 56 of the shaft portion 50 of the hood cushion 16 is plastically deformed or elastically deformed sequentially from below, and passes through the hole 62 of the receiving portion bracket 60. To do. Further, the wing portion 56 is plastically deformed or elastically deformed to absorb the collision energy when the colliding body collides with the hood 20.

  That is, when a collision body collides with the hood 20 and a closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 16, the screw thread 36 is plastically deformed, and then the shaft portion 50 of the hood cushion 16 is deformed. The wing portion 56 hits the hole 62 of the receiving portion bracket 60 and is deformed, so that a lot of collision energy can be absorbed.

  Next, the operation of this embodiment will be described.

  In the present embodiment, the gap H2 between the hood 20 and the apron upper member 12 is larger than that in the first embodiment. Therefore, if the longitudinal elastic modulus of the hood cushion 16 is the same as that of the first embodiment, the stroke S of the hood 20 and the force F received by the hood 20 from the hood cushion 16 as shown by a two-dot chain line in FIG. The relationship is that the rising of the force F with respect to the stroke S is delayed, and the amount of energy absorption is reduced.

  For this reason, in this embodiment, the hood cushion 16 is composed of two materials having different longitudinal elastic modulus, and the longitudinal elastic modulus of the material constituting the shaft portion 50 of the hood cushion 16 constitutes the screw portion 52 of the hood cushion 16. It is higher than the longitudinal elastic modulus of the material. That is, the longitudinal elastic modulus of the material constituting the shaft portion 50 of the hood cushion 16 is higher than the longitudinal elastic modulus of the hood cushion 16 in the first embodiment. As a result, as shown by a solid line in FIG. 8, the rising of the force F with respect to the stroke S is accelerated, and even if the gap H2 between the hood 20 and the apron upper member 12 is larger than that in the first embodiment, the energy absorption is performed. The amount increases.

  When the hood cushion 16 moves downward (arrow A in FIG. 7) and the engagement between the holes 30 of the apron upper member 12 and the screw grooves 36 of all the hood cushions 16 is released, the holes 62 of the receiving bracket 60 are disengaged. The wing portion 56 of the shaft portion 50 of the hood cushion 16 hits the peripheral edge portion 60B of the hood cushion 16, and the wing portion 56 of the shaft portion 50 of the hood cushion 16 is sequentially deformed from below and passes through the hole 62 of the receiving portion bracket 60. . At this time, the wing portion 56 is deformed to absorb the collision energy when the collision body collides with the hood 20.

  As a result, as shown in FIG. 8 (S4 to S5), even when the stroke S becomes equal to or greater than the stroke S4, the force F does not decrease rapidly, and the amount of energy absorbed when the collision object collides further increases. can do. For this reason, the amount of energy absorption can be further increased by effectively using the gap H2 between the hood 20 and the apron upper member 12.

Next, 3rd Embodiment as a reference example of the cushion for doors not included in this invention is described according to FIG.9 and FIG.10.

  In addition, the same member as 2nd Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 9, in this embodiment, the lower part 50A of the shaft part 50 of the cushion 16 has a cylindrical shape, and a groove 64 that is annular around the axis is formed in the vertical direction on the outer peripheral part of the lower part 50A. A plurality are formed at predetermined intervals. In addition, the depth direction of the groove 64 is perpendicular to the axial direction of the shaft portion 50, whereby the wing portion 66 is formed between the adjacent grooves 64.

  A receiving bracket 70 is attached to the lower surface 12 </ b> B of the apron upper member 12. The receiving bracket 70 has a bottomed cylindrical shape, and a circular hole 72 is formed at the center of the bottom 70A. A flange 70 </ b> A is formed outward at the upper end of the receiving bracket 70, and the flange 70 </ b> A is welded to the lower surface 12 </ b> B of the apron upper member 12.

  Note that the size of the hole 72 is smaller than the diameter of the wing portion 66 of the shaft portion 50 in the hood cushion 16, and when the hood cushion 16 moves downward, the hood cushion is formed in the peripheral portion 70 </ b> B of the hole 72. The wing portions 66 of the sixteen shaft portions 50 are in contact with each other.

  As shown in FIG. 10, when the collision body abuts on the hood 20 and a closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 16 from the upper side to the lower side of the vehicle body, the second embodiment. Similarly, since the outer diameter of the screw portion 52 is reduced by plastic deformation of the screw thread 36, the screw portion 52 passes through the hole 30 of the apron upper member 12, and the hole 30 of the apron upper member 12 and the hood cushion 16 The position of engagement with the screw groove 36 is shifted. Further, the screw thread 36 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20.

  Further, when the engagement between the hole 30 of the apron upper member 12 and the screw groove 36 of the hood cushion 16 is released, the wing portion 66 of the shaft portion 50 of the hood cushion 16 is formed on the peripheral edge portion 70B of the hole 72 of the receiving portion bracket 70. It has come to hit. Further, the wing portion 66 of the shaft portion 50 of the hood cushion 16 is plastically deformed or elastically deformed in order from below, and passes through the hole 72 of the receiving portion bracket 70. Further, the wing portion 66 is plastically deformed or elastically deformed, so that the collision energy when the colliding body collides with the hood 20 is absorbed.

  Since the depth direction of the groove 64 is perpendicular to the axial direction of the shaft portion 50, the wing portion 66 of the shaft portion 50 passes through the hole 72 of the receiving portion bracket 70 as compared with the second embodiment. Therefore, the amount of energy absorbed can be increased as compared with the second embodiment.

  Other structural effects are the same as those of the second embodiment.

Next, 4th Embodiment which is a cushion for doors in this invention is described according to FIGS.

  In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 11, in the present embodiment, the hood cushion 76 includes a cylindrical tube portion 78 and a shaft portion 80 inserted into the tube portion 78. Further, the longitudinal elastic modulus of the material constituting the shaft portion 80 is higher than the longitudinal elastic modulus of the material constituting the cylindrical portion 78, and it is difficult for the material to be elastically compressed and deformed.

  The shaft portion 80 has a cylindrical shape with the upper end portion 80A having an enlarged diameter, and a ring-shaped groove 82 is formed on the outer peripheral portion of the lower end portion 80B.

  A screw groove 84 is carved at a predetermined pitch in the axial direction in the lower part 78 </ b> A on the outer periphery of the cylindrical portion 78, and a screw thread 86 is formed between the screw grooves 84.

  The hood cushion 76 is attached to the apron upper member 12 by screwing the screw groove 84 and the screw thread 86 into the hole 30 of the apron upper member 12.

  Further, the screw thread 86 is formed of a square screw having a square cross section, and a concave part 87 is continuously formed in the circumferential direction along the screw thread 86 at the root part 86A of the screw thread 86. The depth direction of the recess 87 is parallel to the axis of the hood cushion 76 from the lower end side to the upper end side of the screw thread 86, and the recess 87 has a cross-sectional area of the root part 86 </ b> A of the screw thread 86. By making it small, the root portion 86A is easily broken as compared with other portions of the screw thread 86, and is a weak portion that undergoes plastic deformation such as fracture.

  For this reason, the screw thread 86 does not plastically deform until the closing direction force of the hood 20 acting on the hood cushion 76 from the upper side to the lower side of the vehicle body reaches a predetermined value. It is designed to be plastically deformed starting at 87.

  Further, a gap 35 is formed between the bottom 84A of the screw groove 84 of the hood cushion 16 and the inner peripheral portion 30A of the hole 30, and the screw thread 36 that is plastically deformed can pass through the gap 35. ing.

  As shown in FIG. 14, when a closing direction force K greater than a predetermined value of the hood 20 is applied to the hood cushion 16 due to the collision of the collision body with the hood 20, the peripheral edge of the hole 30 of the apron upper member 12 is applied. The screw thread 86 on the upper side of the vehicle body that abuts is plastically deformed upward from the recess 87, and the hood cushion 76 moves downward (arrow A in FIG. 14) with respect to the hole 30 of the apron upper member 12. Further, the screw thread 86 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20.

  Moreover, the upper part 78B of the cylinder part 78 in the hood cushion 76 is increased in diameter one after another from the lower side to the upper side, and is greatly expanded in the upper end part 78C.

  As shown in FIG. 12, a plurality of (four in FIG. 12) slits 88 are radially formed in the upper portion 78B of the cylindrical portion 78 of the hood cushion 76 at equal intervals along the circumferential direction. Is divided into a plurality of slits 88.

  Accordingly, when the hood 20 comes into contact with the hood cushion 76, the upper portion 78B of the cylindrical portion 78 of the hood cushion 76 divided by the slit 88 is elastic in the radial direction (arrow B direction in FIG. 12) in which the diameter increases. It is designed to deform.

  As shown in FIG. 11, a ring-shaped convex portion 90 is formed on the inner periphery of the upper end of the lower portion 78 </ b> A of the cylindrical portion 78 in the hood cushion 76. Is engaged with the groove 82 of the lower end 80B. The upper end portion 80A of the shaft portion 80 is below the upper end portion 78C of the cylindrical portion 78 and is in contact with or close to the vicinity of the upper end portion 78C.

  On the inner peripheral surface of the lower portion 78A of the cylindrical portion 78 of the hood cushion 76, a convex portion 92 whose tip is directed inward and downward is formed in an annular shape along the circumferential direction. In addition, a plurality of convex portions 92 are formed at predetermined intervals along the vertical direction, and a concave portion 94 for making the root portion of the convex portion 92 a fragile portion is located above the base portion of the convex portion 92. It is formed downward from.

  Therefore, as shown in FIG. 13, when a closing direction force acts on the hood 20 from the upper side to the lower side of the vehicle body, the hood 20 expands in the diameter of the upper portion 78 </ b> B of the cylindrical portion 78 (the arrow in FIG. 12). After the elastic deformation in the B direction), the hood 20 comes into contact with the shaft portion 80, and the shaft portion 80 is elastically deformed in the axial compression direction.

  Further, when a closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 16 due to the collision of the collision body, as shown in FIGS. 14 and 15, the convex portion 90 and the lower end portion of the shaft portion 80. The engagement with the groove 82 of 80B is released, and the shaft portion 80 moves downward (in the direction of arrow A in FIG. 14). At this time, the projecting portion 90 is deformed to absorb the collision energy when the colliding body collides with the hood 20.

  When a larger closing direction K acts, the periphery of the lower end portion 80B of the shaft portion 80 abuts on the convex portion 92, and the convex portion 92 starts from the concave portion 94 in order from the upper convex portion 92. The shaft portion 80 is further plastically deformed downward, and the shaft portion 80 further moves downward relative to the cylindrical portion 78 of the hood cushion 76. Further, the projecting portion 92 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20.

  As shown in FIG. 15, the shaft portion 80 stops when the upper end portion 80 </ b> A hits the inner peripheral lower portion 78 </ b> D of the cylindrical portion upper portion 78 </ b> B that is elastically deformed in the radial direction (the arrow B direction in FIG. 15).

  Next, the operation of this embodiment will be described.

  When the hood 20 is closed, in the radial direction (in the direction of arrow B in FIG. 12) in which the upper portion 78B of the cylindrical portion 78 expands due to the closing direction force of the hood 20 that acts on the hood cushion 76 downward from the upper side of the vehicle body. Elastically deforms.

  As a result, as shown in FIG. 16, the relationship between the stroke S of the hood 20 and the force F received by the hood 20 from the hood cushion 16 increases to the stroke S as shown in (0 to S1, 0 to F1). On the other hand, the force F rises gently. For this reason, since the force F is small with respect to the stroke S when the hood 20 is normally closed, the hood 20 can be easily closed.

  The stroke S1 can be increased by increasing the gap L between the upper end portion 80A of the shaft portion 80 and the hood inner panel 26.

  When the hood 20 is tightly closed, as shown in FIG. 13, the upper portion 78B of the cylindrical portion 78 of the hood cushion 76 is elastically deformed in the radial direction (in the direction of arrow B in FIG. 13) and the hood 20 is elastically deformed. Since 20 contacts the upper end portion 80A of the shaft portion 80, the shaft portion 80 is elastically deformed in the axial compression direction. As a result, as shown in FIG. 16 (0 to S2, 0 to F2), the force F rises gently with respect to the increase of the stroke S and then rises rapidly. For this reason, since the stroke S becomes small with respect to the force F when the hood 20 is strongly closed, the hood 20 can be prevented from interfering with other parts attached below the hood 20.

  Further, when the collision body abuts the hood 20 from the upper direction of the vehicle body to the lower side of the vehicle body and the closing direction force K of the hood 20 or more acts on the hood cushion 76 from the upper side of the vehicle body to the lower side, As shown in FIG. 14, the hood 20 hits the shaft portion 80, and the engagement between the convex portion 90 and the groove 82 is released. For this reason, the shaft portion 80 moves downward, the lower end portion 80B of the shaft portion 80 comes into contact with the convex portion 92, and the convex portion 92 plastically deforms downward from the concave portion 94, so that the collision body is placed on the hood 20. Absorbs collision energy when a collision occurs. Further, as shown in FIG. 15, the screw thread 86 is plastically deformed upward from the recess 87, and the hood cushion 76 moves downward (arrow A in FIG. 15) with respect to the hole 30 of the apron upper member 12. To do. Further, the screw thread 86 is plastically deformed, so that the collision energy when the collision body collides with the hood 20 is absorbed.

  As a result, as shown in FIG. 16 (0-S3), the force F increases gently with respect to the increase of the stroke S, then increases rapidly, and even if the stroke S becomes greater than or equal to the stroke S2. F does not drop rapidly, and the amount of energy absorbed when the collision object collides can be increased. For this reason, the gap H3 between the hood 20 and the apron upper member 12 can be effectively used to improve the collision energy absorption performance.

  In the above embodiment, the screw thread 86 is deformed following the convex part 92. However, the convex part 92 is deformed following the screw thread 86 depending on the selection of elasticity of each member and the required absorption load pattern. It is also good.

Next, 5th Embodiment which is a cushion for doors in this invention is described according to FIGS.

  In addition, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 17, the hood cushion 100 of the present embodiment is composed of an elastic member such as a columnar rubber or resin. A screw groove 102 is carved at a predetermined pitch in a lower portion 100A of the outer periphery of the hood cushion 100, and a screw thread 104 is formed between the screw grooves 102. Further, the screw groove 102 of the hood cushion 100 is screwed into the hole 30 of the apron upper member 12.

  The hood cushion 100 is attached to the apron upper member 12 by screwing the screw groove 102 and the screw thread 104 into the hole 30 of the apron upper member 12. The upper surface 100B of the hood cushion 100 abuts on the lower surface 26B of the hood inner panel 26 when the hood 20 is in a closed state, and the hood cushion 100 is elastically deformed in the axial direction.

  The protrusion height H4 of the hood cushion 100 from the apron upper member 12 can be adjusted by the amount of screwing of the lower portion 100A of the hood cushion 100 into the apron upper member 12.

  Further, the screw thread 104 is formed of a square screw having a square cross section, and a concave portion 105 is continuously formed in the circumferential direction along the screw thread 104 at the base portion 104A of the screw thread 104. The depth direction of the recess 105 is parallel to the axis of the hood cushion 100 from the lower end side to the upper end side of the screw thread 104, and the recess 105 has a cross-sectional area of the root part 104 </ b> A of the screw thread 104. By making it small, the base portion 104A is easily broken as compared with other portions of the screw thread 104, and is a weak portion that undergoes plastic deformation such as fracture.

  For this reason, the screw thread 104 does not plastically deform until the closing direction force of the hood 20 acting on the hood cushion 100 from above to below the vehicle body reaches a predetermined value. The plastic deformation starts at 105.

  In addition, a gap 103 is formed between the bottom 102A of the screw groove 102 of the hood cushion 100 and the inner peripheral portion 30A of the hole 30, and a screw thread 104 that is plastically deformed can pass through the gap 103. ing.

  Accordingly, as shown in FIG. 21, the collision body collides with the hood 20 from the upper side to the lower side of the vehicle body, and the closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 100 from the upper side to the lower side of the vehicle body. In this case, the screw thread 104 on the vehicle body upper side contacting the peripheral edge of the hole 30 of the apron upper member 12 is plastically deformed upward from the recess 105 as a starting point. In addition, with this deformation, the hood cushion 100 moves downward (arrow A in FIG. 21) with respect to the hole 30 of the apron upper member 12. Further, the screw thread 104 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20.

  That is, when a closing direction force K greater than a predetermined value of the hood 20 is applied to the hood cushion 100, the screwing position between the hole 30 of the apron upper member 12 and the screw thread 104 is changed, so that the apron of the hood cushion 100 is changed. The support position to the upper member 12 changes, and thereby the height H4 of the protrusion of the hood cushion 100 changes.

  As shown in FIGS. 19 and 20, the hood cushion 100 is elastically compressed and deformed in the axial direction that is the closing direction of the hood 20 with a closing direction force that is equal to or greater than a predetermined value of the hood 20, and breaks with a larger closing direction force. A cylindrical portion 100F, and a shaft portion 100E disposed in the cylindrical portion 100F and fixed at both ends in the axial direction of the cylindrical portion 100F. The central portion 100D in the axial direction of the hood cushion 100 has a double structure. It has become. The shaft portion 100E is also elastically compressed and deformed in the closing direction of the hood 20 with a closing direction force equal to or greater than a predetermined value of the hood 20.

  As shown in FIG. 19, a plurality of slits 108 extending in the vertical direction are formed in the cylindrical portion 100F at predetermined intervals along the circumferential direction.

  As shown in FIG. 17, slit-shaped cuts 108 </ b> A are formed from the central portion in the vertical direction of the slit 108 to partially expand the width dimension of the slit 108 toward both sides in the circumferential direction.

  Further, a receiving bracket 110 is attached to the lower surface 12B of the apron upper member 12. The receiving bracket 110 has a dish shape, and the bottom 110 </ b> A faces the lower surface 100 </ b> G of the hood cushion 100. A flange 110 </ b> B is formed on the upper end portion of the receiving bracket 110, and the flange 110 </ b> B is welded to the lower surface 12 </ b> B of the apron upper member 12.

  Therefore, when a closing direction force K of a predetermined value or more of the hood 20 acts on the hood cushion 100 from the upper side to the lower side of the hood cushion 100 due to the collision of the collision body, the hood cushion 100 has the screw groove 102 and the apron upper member. The positions of the twelve holes 30 are shifted and moved downward (in the direction of arrow A in FIG. 21) one after another. Further, the screw thread 104 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20. Further, when a larger closing direction force K is applied, the hood cushion 100 is disengaged from the screw groove 102 and the hole 30 of the apron upper member 12 as shown in FIG. 100G contacts the receiving bracket 110.

  As shown in FIG. 18, the upper portion 100C of the hood cushion 100 is gradually reduced in diameter, and the diameter D1 of the upper surface 100B is smaller than the diameter D2 of other portions (D1 <D2). Therefore, a downward load acting on the hood cushion 100 from the hood 20 is easily transmitted without waste to the shaft portion 100E which is a columnar portion for transmitting the load.

  As shown in FIG. 22, when a larger closing direction force K acts on the hood cushion 100, the shaft portion 100E and the tube portion 100F are elastically compressed and deformed in the closing direction of the hood 20, and the tube portion 100F is seated. By bending or bending, the slit 108 breaks starting from the cut 108A, so that the collision energy when the collision object collides with the hood 20 is absorbed.

  Next, the operation of this embodiment will be described.

  In the present embodiment, when the hood 20 is closed, the protruding portion (H4) protruding from the apron upper member 12 in the hood cushion 100 is elastically deformed. As a result, as shown in FIG. 23, the relationship between the stroke S of the hood 20 and the force F received by the hood 20 from the hood cushion 100 gradually increases as indicated by (0 to S1, 0 to F1). . For this reason, since the force F is small with respect to the stroke S when the hood 20 is normally closed, the hood 20 can be easily closed.

  Further, when the hood 20 is strongly closed, the protruding portion of the hood cushion 100 is greatly elastically deformed. As a result, as shown in FIG. 23 (0 to S2, 0 to F2), the force F rises gently with respect to the increase of the stroke S, and then rises rapidly. Since the stroke S is reduced with respect to the force F, the hood 20 can be prevented from interfering with other parts attached below the hood 20.

  Further, when the collision body comes into contact with the hood 20, the protruding portion of the hood cushion 100 is further elastically deformed. As a result, as shown in (0 to S3, 0 to F3) in FIG. 23, the force F gradually rises after the stroke S increases, and then suddenly rises. The amount of energy absorbed by the hood cushion 100 can be increased.

  Further, when the collision body abuts the hood 20 from the upper side of the vehicle body toward the lower side of the vehicle body and a closing direction force K greater than a predetermined value of the hood 20 acts on the hood cushion 100 from the upper side of the vehicle body to the lower side, the apron upper member The screw thread 104 on the vehicle body upper side of the hood cushion 100 that abuts the peripheral portion of the 12 holes 30 is plastically deformed upward from the concave portion 105 in the order from the lower side to the upper side. As a result, the hood cushion 100 moves downward (arrow A in FIG. 21) with respect to the hole 30 of the apron upper member 12. At this time, the screw thread 104 is plastically deformed to absorb the collision energy when the collision body collides with the hood 20. For this reason, as shown in (S3 to S4) of FIG. 23, the force F repeats a slight vertical movement with respect to the increase of the stroke S but does not increase.

  Further, as shown in FIG. 21, when the screw engagement between the screw groove 102 and the hole 30 of the apron upper member 12 is completely removed, the lower surface 100 </ b> G comes into contact with the receiving bracket 110. When a larger closing direction force K acts, as shown in FIG. 22, the shaft portion 100E and the tube portion 100F of the hood cushion 100 are elastically compressed and deformed in the closing direction of the hood 20, and the tube portion 100F is buckled or bent. Thus, the energy of collision when the collision object collides with the hood 20 is absorbed by breaking the slit 108A as a starting point. Therefore, as shown in (S4 to S5) in FIG. 23, the force F hardly increases and the stroke S further increases.

  Accordingly, the bottom of the hood cushion 100 (limit of elastic deformation) can prevent the hood 20 and the collision body from being increased in force, and can increase the amount of energy absorbed when the collision body collides. For this reason, the gap H4 between the hood 20 and the apron upper member 12 can be effectively used to improve the collision energy absorption performance.

Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the fourth and fifth embodiments, and various other embodiments are within the scope of the present invention. It will be apparent to those skilled in the art that the form is possible .

  In addition, the configuration in which the root portions 36A, 86A, 104A of the screw threads 36, 86, 104 are made weakly deformable more easily than the other parts of the screw threads 36, 86, 104 is the concave portions 40, 87, 105. Other configurations such as formation of holes, arrangement of low-strength members, etc., as long as the force in the closing direction of the hood 20 is a plastic deformation when the force in the closing direction of the hood 20 is equal to or greater than a predetermined value without plastic deformation. It is also good.

  Further, the amount of collision energy absorbed can be adjusted by changing the plastic deformation strength of the root portions 36A, 86A, 104A of the screw threads 36, 86, 104 by changing the depth of the recesses 40, 87, 105, or the like.

  Further, by changing the plastic deformation strength of the root portions 36A, 86A, 104A along the axial direction of the hood cushions 16, 76, 100, the force that the hood receives from the hood cushion as the hood cushion moves in the axial direction. F can be adjusted, and the force received by the collision body from the hood can be adjusted.

  Further, as shown in FIG. 4, the opening / closing door cushion of the present invention can also be applied to a tightly closed hood cushion 18 attached to the upper portion of both ends of the radiator support upper 14 in the vehicle width direction.

  In addition, the opening / closing door cushion of the present invention is not limited to the hood 20 and can be applied to other opening / closing lids such as luggage doors, back doors, sliding doors, etc. It is also applicable to.

  In addition, in each said embodiment, the closing direction force K more than the predetermined value of the food | hood 20 is not necessarily the same.

FIG. 5 is an enlarged cross-sectional view taken along line 1-1 of FIG. It is sectional drawing corresponding to FIG. 1 which shows the deformation | transformation state of the cushion for doors which concerns on 1st Embodiment as a reference example which is not included in this invention. It is the disassembled perspective view which looked at the cushion for opening / closing doors which concerns on 1st Embodiment as a reference example which is not included in this invention from the vehicle body front diagonally upward. It is the perspective view seen from the vehicle body diagonally front which shows the vehicle body front part to which the cushion for opening and closing doors concerning 1st Embodiment as a reference example which is not included in the present invention was applied. It is a graph which shows the relationship between the stroke S of the hood in the opening / closing door cushion which concerns on 1st Embodiment as a reference example not included in this invention , and the force F which a hood receives from a hood cushion. It is sectional drawing corresponding to FIG. 1 which shows the opening-and-closing door cushion which concerns on 2nd Embodiment as a reference example not included in this invention. It is sectional drawing corresponding to FIG. 6 which shows the deformation | transformation state of the cushion for doors which concerns on 2nd Embodiment as a reference example which is not included in this invention. It is a graph which shows the relationship between the stroke S of the hood in the cushion for doors which concerns on 2nd Embodiment as a reference example which is not included in this invention , and the force F which a hood receives from a hood cushion. It is sectional drawing corresponding to FIG. 1 which shows the cushion for doors which concerns on 3rd Embodiment as a reference example which is not included in this invention. It is sectional drawing corresponding to FIG. 9 which shows the deformation | transformation state of the cushion for doors which concerns on 3rd Embodiment as a reference example which is not included in this invention. It is sectional drawing corresponding to FIG. 1 which shows the cushion for doors which concerns on 4th Embodiment which is this invention. FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. It is sectional drawing corresponding to FIG. 11 which shows the deformation | transformation state of the cushion for doors which concerns on 4th Embodiment which is this invention. It is sectional drawing corresponding to FIG. 11 which shows the deformation | transformation state of the cushion for doors which concerns on 4th Embodiment which is this invention. It is sectional drawing corresponding to FIG. 11 which shows the deformation | transformation state of the cushion for doors which concerns on 4th Embodiment which is this invention. It is a graph which shows the relationship between the stroke S of the hood in the opening / closing door cushion which concerns on 4th Embodiment which is this invention , and the force F which a hood receives from a hood cushion. It is sectional drawing corresponding to FIG. 1 which shows the cushion for doors which concerns on 5th Embodiment which is this invention. It is the perspective view seen from the vehicle body front diagonally upper direction which shows the cushion for doors which concerns on 5th Embodiment which is this invention. FIG. 19 is an enlarged cross-sectional view taken along line 19-19 in FIG. FIG. 20 is a cross-sectional view taken along line 20-20 in FIG. It is sectional drawing corresponding to FIG. 17 which shows the deformation | transformation state of the cushion for doors which concerns on 5th Embodiment which is this invention. It is sectional drawing corresponding to FIG. 17 which shows the deformation | transformation state of the cushion for doors which concerns on 5th Embodiment which is this invention. It is a graph which shows the relationship between the stroke S of the hood in the opening / closing door cushion which concerns on 5th Embodiment which is this invention , and the force F which a hood receives from a hood cushion.

Explanation of symbols

12 Apron upper member (mounting member)
16 Food cushion (Cushion for door)
20 Hood (open / close door)
30 Hole 34 Screw groove 36 Screw thread 36A Screw thread root (fragile part)
40 recessed portion 50 shaft portion 52 screw portion 56 wing portion 60 receiving portion bracket 66 wing portion 70 receiving portion bracket 76 hood cushion (opening / closing door cushion)
78 Cylindrical portion of hood cushion 80 Shaft portion of hood cushion 84 Screw groove 86 Screw thread 86A Screw thread root (fragile part)
87 Recess 88 Slit 100 Hood cushion (Cushion for door)
100D Longitudinal central portion of the hood cushion 100E Hood crush shaft portion 100F Hood crush tube portion 102 Screw groove 104 Screw thread 104A Screw thread root (fragile portion)
105 Recess 108 Slit 108A Slit notch 110 Receiving bracket

Claims (2)

In the opening / closing door cushion supported by the mounting member and elastically supporting the opening / closing door at the tip of the protruding portion protruding from the mounting member, the opening / closing door is pushed into the mounting member with a closing direction force equal to or greater than a predetermined value. And changing the protrusion height of the protrusion ,
A cylindrical portion in which the end portion on the protruding portion side is opened radially outwardly by a closing direction force of the opening and closing door; and
It is supported in the cylinder part, receives the closing direction force in a state where the cylinder part is opened, and is elastically compressed and deformed in the closing direction of the opening / closing door by a closing direction force not less than a predetermined value of the opening / closing door. A shaft portion in which a support position to the cylindrical portion is changed by force;
A cushion for opening and closing doors, characterized by comprising: In the opening / closing door cushion supported by the mounting member and elastically supporting the opening / closing door at the tip of the protruding portion protruding from the mounting member, the opening / closing door is pushed into the mounting member with a closing direction force equal to or greater than a predetermined value. And changing the protrusion height of the protrusion,
A cylindrical portion that elastically compresses and deforms in the closing direction of the opening and closing door with a closing direction force equal to or greater than a predetermined value of the opening and closing door, and breaks with a larger closing direction force;
A shaft portion that is disposed in the tube portion and is fixed at both ends in the axial direction of the tube portion, and elastically deforms in the closing direction of the door by a closing direction force that is equal to or greater than a predetermined value of the door.
A cushion for opening and closing doors , characterized by comprising:

Images