JP2017226268A - Fiber-reinforced resin-made center pillar structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin-made center pillar structure which can obtain a desired impact absorption load by properly axially collapsing an energy absorption member which is arranged in a center pillar at a side face collision.SOLUTION: A center pillar structure comprises: an energy absorption member for absorbing a collision load by being axially collapsed at a side face collision; a reinforcing member arranged at an inner face of an outer member; and a transmission member having a fixed part fixed to the reinforcing member, and a pressing part which is arranged at an upper part than the fixed part while separating from the inner face of the outer member and the reinforcing member, and transmits the collision load to the energy absorption member, and having at least higher rigidity than those of the outer member and an inner member. The fixed part of the transmission member is located at a position opposing an opening part of the inner member, and the energy absorption member is supported while separating from the inner member or the pressing part before the side face collision, and at the side face collision, sandwiched by an inner face of the inner member and the pressing part in an upper part of the opening part, and collapsed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a center pillar structure made of fiber reinforced resin constituting a vehicle body structure.

  As a structure of a side part of a vehicle body such as a passenger car, a structure including a side sill located at a lower part of the side part of the vehicle body and a center pillar having a lower end connected to the side sill and extending in the vertical direction is known. The structure of the conventional vehicle body side part is comprised with metal materials, such as a steel plate. The integrated structure of the metal side sill and the center pillar has an outer member located on the outer side of the vehicle body and an inner member located on the inner side of the vehicle body, and these outer members and inner member are joined together. ing.

  On the other hand, in recent years, for the purpose of reducing the weight of the vehicle body, it has been studied to configure the vehicle body structure using a carbon fiber reinforced resin. For example, Patent Document 1 discloses a center pillar composed of a center pillar upper made of carbon fiber reinforced resin and an aluminum center pillar lower, provided with a hinge inside the center pillar, and an impact absorbing member outside the center pillar. By providing the center pillar, there is disclosed a center pillar that increases the strength against side impact collision load while minimizing an increase in weight.

Japanese Patent Laying-Open No. 2015-047895

  However, since the center pillar structure of Patent Document 1 uses an aluminum center pillar lower, the strength becomes insufficient and a hinge needs to be provided. Moreover, since the center pillar structure of patent document 1 equips the exterior with an impact-absorbing member, a big design change is required with respect to the structure of the conventional center pillar.

  On the other hand, by forming the entire center pillar using carbon fiber reinforced resin, although weight reduction and strength improvement are expected, the destruction of the structural member made of carbon fiber reinforced resin is brittle, The shock absorbing load may be insufficient. By providing an energy absorbing member such as a crash box inside a center pillar made of carbon fiber reinforced resin, brittle fracture of the center pillar can be axially collapsed. A belt retractor for winding the belt may be provided. In this case, it is not easy to support the energy absorbing member in the horizontal direction.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to appropriately collapse the energy absorbing member disposed inside the center pillar at the time of a side collision to obtain a desired It is an object of the present invention to provide a new and improved center-pillar structure made of fiber reinforced resin capable of realizing a shock absorbing load.

  In order to solve the above problems, according to an aspect of the present invention, an outer member made of fiber reinforced resin disposed on the outer side in the vehicle width direction and an outer member disposed on the inner side in the vehicle width direction are joined. And an inner member made of fiber reinforced resin having an opening where the belt retractor is disposed, an energy absorbing member that axially collapses and absorbs a collision load at the time of a side collision, and a reinforcing member provided on the inner surface of the outer member And a fixing portion that is fixed to the reinforcing member, and a pressing portion that is spaced apart from the inner surface of the outer member and the reinforcing member and that is disposed above the fixing portion and transmits a collision load to the energy absorbing member. And a transmission member having a strength higher than that of the inner member and the inner member, the fixing portion of the transmission member is in a position facing the opening of the inner member, and the energy absorbing member is the inner portion before the side collision. Or it is supported spaced apart from the pressing unit, at the time of side collision is sandwiched by the inner surface of the pressing portion of the inner member above the opening are crushed, the center pillar structure made of fiber reinforced resin is provided.

  The transmission member may have a bent shape or a curved shape projecting toward the inner member side.

  A reinforcing member may be provided in the side collision assumption part corresponding to the height of the bumper of a passenger car.

  The reinforcing member may have a fragile portion that is formed along the vehicle length direction and that defines a bending position at the time of a side collision.

  The fixing portion of the transmission member may be positioned below the fragile portion of the reinforcing member.

  Before the side collision, the energy absorbing member may be held on either the pressing portion or the inner surface of the inner member above the opening.

  Before the side collision, the inner member side surface of the pressing portion of the transmission member may face obliquely upward.

  As described above, according to the present invention, at the time of a side collision, the center made of fiber reinforced resin can realize a desired shock absorbing load by appropriately crushing the energy absorbing member arranged inside the center pillar. A pillar structure can be provided.

It is a schematic diagram which shows the vehicle body structure which concerns on embodiment of this invention. It is a schematic diagram which shows the center pillar of the vehicle body structure which concerns on the same embodiment. It is explanatory drawing which shows the opening part provided in the inner member of the center pillar. It is a schematic diagram which shows the mode of the center pillar at the time of a side collision. It is explanatory drawing which shows the center pillar structure which concerns on the same embodiment. It is explanatory drawing which shows the weak part of a reinforcement member. It is a schematic diagram which shows a mode that a center pillar deform | transforms at the time of a side collision. It is a schematic diagram which shows a mode that an energy absorption member is crushed at the time of a side collision. It is explanatory drawing which shows the mode of the crushing initial stage of the energy absorption member of the vehicle body structure which concerns on the same embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, the duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol. In the present specification and drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral. However, when it is not necessary to particularly distinguish each of a plurality of constituent elements having substantially the same functional configuration, only the same reference numerals are given.

  FIG. 1 is a schematic diagram showing an external appearance of a vehicle body side structure 1 to which a center pillar structure according to an embodiment of the present invention can be applied. The vehicle body side structure 1 shown in FIG. 1 schematically shows a part of the structure on the left side toward the front of the passenger car. As shown in FIG. 1, in this specification, the longitudinal direction of the vehicle (vehicle length direction) is also referred to as the vehicle body X-axis direction, the vehicle width direction is also referred to as the vehicle body Y-axis direction, and the vehicle height direction is referred to as the vehicle body Z. Also called axial direction.

  The vehicle body side structure 1 includes a roof pillar 5, a rear pillar 4, a front pillar 2, a center pillar 3, a side sill 6, and the like. The roof pillar 5 extends along the vehicle body X-axis direction in the upper part of the vehicle compartment space of the vehicle, and forms a side portion of the vehicle roof. The side sill 6 extends along the vehicle body X-axis direction at the lower part of the side portion of the vehicle.

  The front pillar 2 has a lower end connected to the front end of the side sill 6 and an upper end connected to the front end of the roof pillar 5. The front pillar 2 forms a front part that constitutes a vehicle compartment space of the vehicle, and is arranged so as to support the side of the windshield. The rear pillar 4 has a lower end connected to the rear end of the side sill 6 and an upper end connected to the rear end of the roof pillar 5. The center pillar 3 has a lower end connected to the center portion of the side sill 6 in the vehicle body X-axis direction and an upper end connected to the center portion of the roof pillar 5 in the vehicle body X-axis direction.

  An opening for a front door is formed between the side sill 6, the roof pillar 5, the front pillar 2, and the center pillar 3. An opening for a rear door is formed between the side sill 6, the roof pillar 5, the rear pillar 4, and the center pillar 3. Each member constituting the vehicle body side structure 1 is further configured by a plurality of members. For example, each member may be configured by joining an outer member on the outer side in the vehicle width direction and an inner member on the inner side in the vehicle width direction.

  In the vehicle body side part structure 1, at least the center pillar 3, at least the center part of the roof pillar 5 to which the center pillar 3 is connected, and at least the center part of the side sill 6 to which the center pillar 3 is connected are made of fiber reinforced resin. It consists of the structural member 10 formed integrally. The structural member 10 includes a center pillar portion 12 constituting the center pillar 3, a roof pillar portion 16 connected to the upper end of the center pillar portion 12, and a side sill portion 14 connected to the lower end of the center pillar portion 12. The structural member 10 made of fiber reinforced resin is also configured by joining an outer member and an inner member.

  2-5 is a figure for demonstrating the structural example of the structural member 10 containing the center pillar structure which concerns on this embodiment. FIG. 2 shows the structural member 10 as viewed from the front side of the vehicle. FIG. 3 is a view of the lower region C of the structural member 10 provided with the opening 27 indicated by a dotted line in FIG. 2 as viewed from the inner member 20 side. FIG. 4 is an explanatory diagram showing a state in which the center pillar 12 is deformed at the time of a side collision. FIG. 5 is an explanatory diagram showing the internal structure of the lower region C of the structural member 10 indicated by the dotted line in FIG.

  In the vehicle body side structure 1 according to the present embodiment, the center pillar portion 12 of the structural member 10 has a hollow cylindrical shape whose axial direction is arranged along the vehicle body Z-axis direction. Further, the side sill portion 14 has a hollow cylindrical shape whose axial direction is arranged along the vehicle body X-axis direction. The structural member 10 includes an outer member 30 and an inner member 20, and the outer member 30 and the inner member 20 are joined to each other.

  For example, the inner member 20 may have a U-shaped or hat-shaped open cross-sectional shape opened to the outer member 30 side. Further, the outer member 30 may have a U-shaped or hat-shaped open cross-sectional shape opened to the inner member 20 side. For example, the inner member 20 and the outer member 30 having a hat-shaped open cross-sectional shape each have a flange portion provided along the end portion, and can be joined to each other via the flange portion. However, the cross-sectional shapes of the inner member 20 and the outer member 30 are not limited to the above example, and the inner pillar 20 and the outer member 30 can be joined to form the center pillar portion 12 having a closed cross-sectional shape. Good.

  The inner member 20 and the outer member 30 are a multi-layer composite material formed using a fiber reinforced resin using a thermoplastic resin or a thermosetting resin and a reinforced fiber, and realizes high strength and light weight. It is possible. The inner member 20 and the outer member 30 are formed by laminating fiber reinforced resin sheets including continuous fibers, for example. The fiber reinforced resin sheet containing continuous fibers can be formed by impregnating continuous fibers with a matrix resin. Examples of continuous fibers that can be used include carbon fibers, but other fibers may be used, and a plurality of fibers may be used in combination. However, since carbon fibers are excellent in mechanical properties, it is preferable that the reinforcing fibers include carbon fibers.

  As the matrix resin of the fiber reinforced resin, a thermoplastic resin or a thermosetting resin is used. Examples of the thermoplastic resin include polyethylene resin, polypropylene resin, polyvinyl chloride resin, ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), polystyrene resin, AS resin (acrylonitrile-styrene copolymer synthetic resin), polyamide resin. And polyacetal resin, polycarbonate resin, polyester resin, PPS (polyphenylene sulfide) resin, fluorine resin, polyetherimide resin, polyetherketone resin, or polyimide resin.

  As the matrix resin, one or a mixture of two or more of these thermoplastic resins can be used. Alternatively, the matrix resin may be a copolymer of these thermoplastic resins. When the thermoplastic resin is a mixture, a compatibilizer may be used in combination. Furthermore, a brominated flame retardant, a silicon flame retardant, red phosphorus, or the like may be added to the thermoplastic resin as a flame retardant.

  When the inner member 20 or the outer member 30 is molded from a fiber reinforced resin sheet using a thermoplastic resin and continuous fibers, for example, a press molding method may be employed. When the inner member 20 or the outer member 30 is press-molded, for example, a plurality of fiber reinforced resin sheets are laminated to form a prepreg having a predetermined thickness, and then the prepreg is heated to a temperature equal to or higher than the melting point of the thermoplastic resin. The inner member 20 or the outer member 30 is formed by putting it into the mold and further cooling the prepreg below the melting point of the thermoplastic resin. The orientation direction of the continuous fibers of the plurality of fiber reinforced resin sheets to be laminated may be aligned in one direction or may be different. In addition, the molding method of the inner member 20 or the outer member 30 when using a thermoplastic resin is not limited to the press molding method.

  Moreover, as a thermosetting resin, an epoxy resin, unsaturated polyester resin, vinyl ester resin, a phenol resin, a polyurethane resin, a silicon resin etc. are illustrated, for example. As the matrix resin, one type of these thermosetting resins or a mixture of two or more types can be used. When these thermosetting resins are used, an appropriate curing agent or reaction accelerator may be added to the thermosetting resin.

  When the inner member 20 or the outer member 30 is molded from a fiber reinforced resin sheet using a thermosetting resin and continuous fibers, for example, an autoclave molding method may be employed. When autoclave molding the inner member 20 or the outer member 30, for example, after a plurality of fiber reinforced resin sheets are laminated to form a prepreg having a predetermined thickness, the prepreg is placed on a molding die and bagging is performed. The inner member 20 or the outer member 30 is formed by heating and curing the prepreg while keeping the inside of the bag in a vacuum state in the autoclave apparatus. The orientation direction of the continuous fibers of the plurality of fiber reinforced resin sheets to be laminated may be aligned in one direction or may be different. In addition, the molding method of the inner member 20 or the outer member 30 when using the thermosetting resin is not limited to the autoclave molding method.

  In the center pillar portion 12 of the structural member 10 according to the present embodiment, an opening portion 27 in which a belt retractor for winding up the seat belt is disposed is provided below the inner member 20. The position where the opening 27 is provided is included in the side collision assumed site. As shown in FIG. 4, the assumed side collision portion is at a height at which a bumper 80 of a vehicle such as a passenger car can collide, and can be defined as a region whose height from the road surface is within a range of 300 to 600 mm, for example. By disposing the energy absorbing member inside the center pillar portion 12 located at the side collision assumed site, brittle fracture of the fiber-reinforced resin center pillar portion 12 is prevented, and the collision load at the time of the side collision is efficiently Can be absorbed. However, since the opening 27 is provided in the inner member 20 located at the side collision assumed site, the energy absorbing member cannot be arranged along the horizontal direction that is the load input direction at the time of the side collision.

  FIG. 5 is a schematic diagram showing the inside of the lower region C of the structural member 10 shown in FIG. The inner member 20 has an opening 27. A reinforcing member 50 is provided on the inner surface of the outer member 30 facing the opening 27. The reinforcing member 50 is made of, for example, a thin metal plate, has at least higher strength than the outer member 30, and can be bonded to the inner surface of the outer member 30 with an adhesive or the like. The reinforcing member 50 has a function of reinforcing the outer member 30 so that the outer member 30 is not brittlely broken at the time of a side collision. The reinforcing member 50 has a fragile portion 51 for defining a bending position of the reinforcing member 50 at the time of a side collision. Since the reinforcing member 50 includes the fragile portion 51, the reinforcing member 50 can be bent along a planned bending line extending in the vehicle body X-axis direction at the time of a side collision.

  FIG. 6 is a plan view illustrating a configuration example of the fragile portion 51. The reinforcing member 50 illustrated in FIG. 6 has a substantially rectangular planar shape, and has fragile portions 51 made of notches at both ends in the vehicle body X-axis direction. The fragile portion 51 defines the bending position of the reinforcing member 50 at the time of a side collision. That is, at the time of a side collision, the reinforcing member 50 is bent along the planned bending line L that passes through the weakened portions 51 at both ends. The fragile portion 51 is not limited to a fragile portion made of notches. For example, the weak part which consists of an opening part provided in the reinforcement member 50 or a slit may be sufficient, and the weak part which consists of a thin part thinned compared with the other part may be sufficient.

  Returning to FIG. 5, the transmission member 60 is fixed to a portion of the reinforcing member 50 below the planned bending line L defined by the fragile portion 51. The transmission member 60 includes a fixing portion 61 fixed to the reinforcing member 50 and a pressing portion 63 provided above the fixing portion 61 and spaced from the outer member 30 and the reinforcing member 50. The transmission member 60 has a bent shape projecting toward the inner member 20 side. The transmission member 60 may have a curved shape that protrudes toward the inner member 20 instead of a bent shape. The surface of the pressing portion 63 on the inner member 20 side is directed obliquely upward. The planar shape of the transmission member 60 viewed in the vehicle body Y-axis direction is not particularly limited. Any rigidity or strength capable of transmitting a collision load from the outer member 30 to the energy absorbing member 70 at the time of a side collision may be used.

  In FIG. 5, the fixing portion 61 is provided at the lower end portion of the transmission member 60, and the pressing portion 63 is provided at the upper end portion of the transmission member 60, but below or above the bent portion that projects to the inner member 20 side. If it is a position on the side, the arrangement position is not limited. Further, in FIG. 5, the fixing portion 61 of the transmission member 60 is provided at a position facing the opening 27 provided in the inner member 20, but the planned bent line defined by the fragile portion 51 of the reinforcing member 50. If it is below L, the fixing position of the reinforcing member 50 and the fixing portion 61 is not limited.

  An energy absorbing member 70 made of fiber reinforced resin is supported on the inner member 20 side surface of the pressing portion of the transmission member 60. The energy absorbing member 70 receives and collides with a collision load at the time of a side collision, and absorbs the collision load. Further, the energy absorbing member 70 also plays a role of efficiently transmitting the collision load to the inner member 20 when the collision load is large. For example, the energy absorbing member 70 is a multi-layer composite material formed using a thermosetting resin or a carbon fiber reinforced resin using a thermoplastic resin and carbon fiber, and realizes high strength and light weight. It is possible.

  For example, the energy absorbing member 70 has a cylindrical shape. The energy absorbing member 70 made of fiber reinforced resin absorbs the collision load by being crushed while sequentially breaking from the tip side when the collision load is input. Since the energy absorbing member 70 made of fiber reinforced resin sequentially breaks at a small interval as compared with a crash box made of steel plate, it is possible to realize a stable load absorbing characteristic with little load fluctuation. Further, the energy absorbing member 70 made of fiber reinforced resin has a characteristic that the remaining amount of crushing is relatively small and the impact load absorption amount per unit weight is large. As the fiber reinforced resin and the matrix resin constituting the energy absorbing member 70, the same material as the fiber reinforced resin constituting the inner member 20 and the outer member 30 can be used.

  In the energy absorbing member 70 having a cylindrical shape, the distal end side is fixed to the pressing portion 63 of the transmission member 60 with an adhesive or the like. Although the rear end side of the energy absorbing member 70 is directed to the inner member 20 side, it is supported away from the inner member 20. As described above, since the surface on the inner member 20 side of the pressing portion 63 of the transmission member 60 faces obliquely upward, the rear end surface of the cylindrical energy absorbing member 70 fixed to the pressing portion 63 also faces obliquely upward. Therefore, the rear end surface of the energy absorbing member 70 and the inner surface of the inner member 20 are not parallel.

  The dimensions of the energy absorbing member 70 can be appropriately designed in consideration of the size of the center pillar portion 12, the load absorption characteristics to be obtained, the weight of the energy absorbing member 70, and the like. For example, the axial length of the energy absorbing member 70 may be 50 to 100 mm, and the thickness may be 3 to 5 mm. Moreover, the energy absorption member 70 may have a taper part which diameter-reduces toward an edge part in the front end side. Due to such a tapered portion, when a collision load is transmitted to the front end side of the energy absorbing member 70 via the transmission member 60, peeling easily occurs between a plurality of layers constituting the energy absorbing member 70. Thereby, the trigger of the destruction of the front end side of the energy absorption member 70 is given, and the energy absorption member 70 can be easily destroyed sequentially. In addition, the structure of the energy absorption member 70 is not restricted to a cylindrical shape, A various structure is employable.

  7 and 8 show how the center pillar portion 12 of the structural member 10 according to the present embodiment is deformed at the time of a side collision. As shown in FIG. 4, when a bumper 80 or the like of another vehicle collides with a side collision assumed portion as shown in FIG. 4, first, a collision load is applied to the outer member 30 located outside the vehicle body Y-axis direction. Is entered. The lower parts of the outer member 30 and the inner member 20 are connected to the side sill 6 so that they are not greatly displaced. On the other hand, the center pillar portion 12 is displaced inward in the vehicle body Y-axis direction due to a collision load.

  At this time, since the reinforcing member 50 is provided on the inner surface of the outer member 30 located at the side collision assumed portion, the outer member 30 is not brittlely broken by the collision load. Further, since the reinforcing member 50 has the weakened portion 51 that defines the bending position, the outer member 30 to which the reinforcing member 50 is joined to the inner surface is bent along the planned bending line L as shown in FIG. As a result, the inner member 20 side surface of the reinforcing member 50 below the planned bending line L is directed obliquely downward, and the pressing portion 63 of the transmission member 60 fixed to the portion is the inner member. Extruded to the 20 side. That is, the energy absorbing member 70 fixed to the pressing portion 63 is pressed against the inner member 20 avoiding the opening 27 for installing the belt retractor.

  The surface of the energy absorbing member 70 on the inner member 20 side is preferably in contact with the inner surface of the inner member 20 substantially in parallel. For this purpose, the pressing part 63 and the inner surface of the inner member 20 are substantially in a state where the energy absorbing member 70 is sandwiched between the pressing part 63 and the inner member 20 while considering the deformation of the center pillar part 12 at the time of a side collision. The degree of bending or bending of the transmission member 60 can be appropriately set so as to be parallel.

  After the rear end surface of the energy absorbing member 70 contacts the inner member 20, the energy absorbing member 70 is sandwiched between the pressing portion 63 and the inner member 20, and the transmission member 60 is moved from the outer member 30 as shown in FIG. In response to the collision load transmitted to the energy absorbing member 70, the energy absorbing member 70 is axially collapsed. Since the transmission member 60 has a strength that is at least greater than the strength of the outer member 30 and the inner member 20, the transmission member 60 is not greatly deformed by a collision load. For this reason, even if the assumed side collision portion is at a position facing the opening 27 for installing the belt retractor, the energy absorbing member 70 can be crushed in the axial direction above the opening 27. Thereby, a collision load can be absorbed by the axial collapse of the energy absorbing member 70 while suppressing brittle fracture of the center pillar portion 12.

  FIG. 9 shows a modification of the structure of the center pillar portion 12 according to the present embodiment. FIG. 9 shows the structure of the center pillar 12 before the side collision, and the energy absorbing member 70 is fixed to the inner surface of the inner member 20 instead of the transmission member 60. The inner surface of the inner member 20 to which the rear end surface of the energy absorbing member 70 is fixed is located above the opening 27 for installing the belt retractor. Before the side collision, the energy absorbing member 70 is held with the distal end side separated from the pressing portion 63 of the transmission member 60. Before the side collision, the inner member 20 side surface of the pressing portion 63 of the transmission member 60 faces obliquely upward, and the distal end surface of the energy absorbing member 70 and the pressing portion 63 of the transmission member 60 are not parallel.

  Also in the structure of the center pillar portion 12 according to the modified example, the brittle fracture of the outer member 30 is suppressed by the reinforcing member 50 at the time of a side collision, and the outer member 30 and the reinforcing member 50 are separated by the fragile portion 51 of the reinforcing member 50. It bends along a predetermined bend line L. Thereby, the pressing part 63 of the transmission member 60 is pushed out to the inner member 20 side, and the energy absorbing member 70 is sandwiched between the pressing part 63 of the transmission member 60 and the inner surface of the inner member 20 as shown in FIG. Can be. Thereafter, as shown in FIG. 8, the energy absorbing member 70 undergoes axial collapse due to a collision load transmitted from the outer member 30 to the energy absorbing member 70 via the transmitting member 60. Thereby, even if the side collision assumption part exists in the position which opposes the opening part 27 for belt retractor installation, the energy absorption member 70 axially collapses above the opening part 27, and can absorb a collision load.

  As described above, the structural member 10 including the center pillar portion 12 made of fiber reinforced resin according to the present embodiment causes brittle fracture of the outer member 30 to the inner surface of the outer member 30 located at the side collision assumed site. The reinforcing member 50 to be suppressed is provided. For this reason, at the time of a side collision, the outer member 30 is deformed so that the upper side is displaced to the inner member 20 without being brittlely broken. Thereby, the pressing part 63 above the transmission member 60 fixed to the reinforcing member 50 is pushed out to the inner member 20 side.

  For this reason, even if the opening 27 for installing the belt retractor is formed at a position corresponding to the side collision assumed site in the inner member 20, the inner surface of the inner member 20 above the opening 27 is The energy absorbing member 70 can be axially crushed by the pressing portion 63 of the transmission member 60. As a result, the fracture mode of the center pillar portion 12 is not a brittle fracture but an axial crush, and the collision load generated by the side collision can be efficiently absorbed by the energy absorbing member 70.

  Moreover, in the structure of the center pillar part 12 which concerns on this embodiment, the reinforcement member 50 has the weak part 51 which prescribes | regulates a bending position. For this reason, at the time of a side collision, the reinforcing member 50 becomes easy to bend along the predetermined bending line L. Therefore, the pressing portion 63 above the transmission member 60 fixed to the reinforcing member 50 below the planned bending line L is reliably pushed out to the inner member 20 side.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention. Moreover, the aspect which mutually combined said embodiment and each modification naturally belongs to the technical scope of this invention.

  For example, in the structure of the center pillar portion 12 according to the above embodiment, the opening 27 formed in the inner member 20 is the opening 27 for installing the belt retractor, but the present invention is not limited to such an example. The present invention can be applied to any center pillar portion in which an opening is provided at a position corresponding to a side collision assumed site in the inner member 20.

DESCRIPTION OF SYMBOLS 1 Vehicle body side part structure 10 Structural member 12 Center pillar part 14 Side sill part 20 Inner member 30 Outer member 50 Reinforcement member 51 Fragile part 60 Transmission member 61 Fixing part 63 Press part 70 Energy absorption member

Claims (7)

An outer member made of fiber reinforced resin disposed on the outer side in the vehicle width direction;
An inner member made of fiber reinforced resin, disposed on the inner side in the vehicle width direction, joined to the outer member, and having an opening in which a belt retractor is disposed;
An energy absorbing member that absorbs a collision load by axial crushing at the time of a side collision;
A reinforcing member provided on the inner surface of the outer member;
A fixing portion that is fixed to the reinforcing member; and a pressing portion that is spaced apart from the inner surface of the outer member and the reinforcing member and disposed above the fixing portion to transmit the collision load to the energy absorbing member. And a transmission member having at least higher strength than the outer member and the inner member,
The energy absorbing member is supported separately from the inner member or the pressing portion before a side collision, and is crushed by being sandwiched between the inner surface of the inner member and the pressing portion above the opening during a side collision. Center pillar structure made of fiber reinforced resin.   The center pillar structure made of fiber reinforced resin according to claim 1, wherein the transmission member has a bent shape or a curved shape projecting toward the inner member side.   The center pillar structure made of fiber reinforced resin according to claim 1 or 2, wherein the reinforcing member is provided at a side collision assumed portion corresponding to a height of a bumper of a passenger car.   The center pillar structure made of fiber reinforced resin according to any one of claims 1 to 3, wherein the reinforcing member has a fragile portion that is formed along a vehicle length direction and defines a bending position at the time of a side collision.   The center pillar structure made of fiber reinforced resin according to claim 4, wherein the fixing portion of the transmission member is positioned below the fragile portion of the reinforcing member.   The fiber reinforcement according to any one of claims 1 to 5, wherein the energy absorbing member is held on either the inner surface of the inner member above the pressing portion or the opening before the side collision. Center pillar structure made of resin. The center pillar structure made of fiber-reinforced resin according to any one of claims 1 to 6, wherein a surface of the pressing portion of the transmission member on the inner member side faces obliquely upward before a side collision.

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