JP6597044B2 - Spare tire storage structure - Google Patents

Description

  The present invention relates to a spare tire storage unit structure.

  The following Patent Document 1 discloses an invention related to a spare tire storage unit structure. In this spare tire storage portion structure, convex beads are formed in a spare tire house provided on the floor panel. The convex bead has a curved wall portion along the surface of the spare tire, and the spare tire is in a continuous surface contact state with the convex bead from the sidewall portion to the tread portion in the stored state. . For this reason, it is possible to increase the resonance frequency of the vibration system including the floor panel and the spare tire, and to reduce the noise caused by the vibration of the floor panel.

JP 2008-230354 A

  However, in the case of the prior art described in Patent Document 1, since it is necessary to set the shape of the convex bead according to the type of tire used for the spare tire, there is room for improvement in terms of versatility and cost. is there.

  In view of the above facts, the present invention has an object to obtain a spare tire storage portion structure capable of reducing the noise caused by vibration of a floor panel while achieving both versatility and cost reduction.

The spare tire storage structure according to the first aspect of the present invention includes a floor cross member that is provided on a floor panel constituting the vehicle body and extends in the vehicle width direction, the floor cross member on the floor panel, and the front and rear of the vehicle. A restricting means for restricting relative movement of the spare tire placed with a gap in the direction with respect to the floor panel, and disposed in a gap between the floor cross member and the spare tire and along a tread surface of the spare tire comprising a contact surface portion, it has a, a space reducing member which is detachably attached to the floor cross member, the contact surface is in contact with the tread surface in a state in which the space reducing member is disposed in the gap It is .

  According to the first aspect of the present invention, the floor cross member that extends in the vehicle width direction is provided on the floor panel that constitutes the vehicle body, and the floor panel includes the floor cross member and the vehicle front-rear direction. Spare tires are placed at intervals. The spare tire is restricted from relative movement with respect to the floor panel by the restricting means. For this reason, when the floor panel is vibrated by a vehicle drive system or the like, the wheel portion of the spare tire, the tire portion of the spare tire, and the floor panel function as a one-degree-of-freedom vibration system. Specifically, a one-degree-of-freedom vibration system is configured in which the wheel portion of the spare tire is a mass and the tire portion of the spare tire and the floor panel are springs arranged in series.

  By the way, when the resonance frequency of the vibration system configured as described above exists in a low frequency band, it is considered that the sound generated by the vibration of the floor panel becomes a muffled sound. As a method of reducing this booming noise, increasing the resonance frequency of the vibration system can be mentioned. Since the resonance frequency of the vibration system is proportional to the half power of the spring constant of the spring constituting the vibration system, the resonance frequency is increased by increasing the spring constant of the spring constituting the vibration system. It is possible to increase.

  For example, it is conceivable to provide a convex bead having a contact surface portion along the tread surface of the tire portion on the floor panel. According to such a configuration, the contact portion between the tread portion and the contact surface portion constituting the tire portion functions as a spring arranged in parallel with the spring of the vibration system, and the spring of the spring constituting the vibration system The constant can be increased.

  However, when such a configuration is adopted, it is necessary to set the shape of the convex bead according to the type of tire adopted for the spare tire.

  Here, in this invention, it has the gap filling member provided with the contact surface part along the tread surface of a spare tire, and the said gap filling member is arrange | positioned in the clearance gap between a floor cross member and a spare tire. For this reason, the contact part with the contact surface part in the tread part of a spare tire can be functioned as a spring arrange | positioned in parallel with respect to the spring of the vibration system comprised with the spare tire and the floor panel. As a result, it is possible to increase the spring constant of the spring constituting the vibration system including the floor panel, and consequently increase the resonance frequency of the vibration system.

In addition, the gap filling member is detachable from the floor cross member. For this reason, even if the type of tire used for the spare tire is different, it is possible to include the floor panel without changing the configuration of the floor panel by replacing it with a gap filling member having a shape corresponding to the type of each tire. The resonance frequency of the configured vibration system can be increased.
A spare tire storage portion structure according to a second aspect of the present invention is the spare tire storage portion structure according to the first aspect of the present invention, wherein the gap filling member is solid.

  As described above, the spare tire storage unit structure according to the first aspect of the present invention can reduce the noise caused by the vibration of the floor panel while achieving both versatility and cost reduction. Has an excellent effect.

It is an expanded sectional view (sectional view showing the state where it cut along line 1-1 of Drawing 4) which looked at the vehicle body rear part to which the spare tire storage part structure concerning this embodiment was applied from the vehicle width direction. It is an expanded sectional view (sectional view showing the state where it cut along line 2-2 of Drawing 4) which looked at the back of the body to which the spare tire storage part structure concerning this embodiment was applied from the vehicle width direction. FIG. 3 is an enlarged cross-sectional view (a cross-sectional view showing a state cut along a line 3-3 in FIG. 2) of a rear part of a vehicle body to which a spare tire storage unit structure according to the present embodiment is applied, as viewed from above the vehicle. It is the top view seen from the vehicles upper part side which shows the structure of the vehicle body rear part to which the spare tire storage part structure which concerns on this embodiment was applied.

  Hereinafter, an example of an embodiment of a spare tire storage unit structure according to the present invention will be described with reference to FIGS. Note that an arrow FR that is appropriately shown in each drawing indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  First, the basic structure of the vehicle body rear part 14 which comprises the vehicle rear side part in the vehicle body 12 of the vehicle 10 to which the spare tire storage part structure which concerns on embodiment of this invention is applied is demonstrated. As shown in FIG. 4, the vehicle body rear portion 14 includes a rear floor panel 18 as a floor panel that forms a portion on the vehicle rear side of the floor portion 16 of the vehicle 10 and extends in the vehicle front-rear direction and the vehicle width direction. It is configured. The rear floor panel 18 is formed by pressing a steel plate, and a spare tire 32 is attached to the rear floor panel 18 as will be described later. A rear side member 20 extends along the periphery of the rear floor panel 18 on the outer side in the vehicle width direction, and a lower back (not shown) is provided on the periphery of the rear floor panel 18 on the vehicle rear side. A panel is provided.

  The rear side member 20 is configured to include a rear side member upper 22 that constitutes a portion on the upper side of the vehicle and a rear side member lower (not shown) that constitutes a portion on the lower side of the vehicle. Has been placed. The rear side member upper 22 includes a base portion 22A that is a rectangular plate shape in plan view with the plate thickness direction being the vehicle vertical direction, an inner flange portion 22B provided on the inner side in the vehicle width direction of the base portion 22A, and a base portion 22A. And an outer flange portion 22C provided on the outer side in the vehicle width direction.

  The rear side member lower is a plate-shaped bulging portion having a U-shape in which the longitudinal direction is the vehicle front-rear direction, and the cross-sectional shape seen in the vehicle front-rear direction bulges to the vehicle lower side and the vehicle upper side is opened It is comprised including. Further, the inner flange portion having the same configuration as the inner flange portion 22B along the end portion on the inner side in the vehicle width direction of the bulging portion is connected to the outer flange portion 22C along the end portion on the outer side in the vehicle width direction of the bulging portion. The outer flange part of the same structure is each provided.

  The outer flange portion 22C of the rear side member upper 22 and the outer flange portion of the rear side member lower are joined by a joining means such as welding in a state of surface contact. On the other hand, the inner flange portion 22B of the rear side member upper 22 and the inner flange portion of the rear side member lower are joined to each other by a joining means such as welding in a state where the rear floor panel 18 has a peripheral portion on the outer side in the vehicle width direction. The rear side member 20 configured as described above has a rectangular frame shape in a cross-sectional view when viewed in the vehicle front-rear direction and a closed cross-sectional structure extending in the vehicle front-rear direction.

  Further, the peripheral portion on the vehicle front side of the rear floor panel 18 is joined to the peripheral portion on the vehicle rear side of the center floor panel 24 constituting the center portion of the floor portion 16 in the vehicle front-rear direction by joining means such as welding. As shown in FIG. 1, a floor cross member 26 is disposed on the rear side of the vehicle with respect to the rear floor panel 18 from the joint portion between the rear floor panel 18 and the center floor panel 24.

  The floor cross member 26 includes an upper cross member 28 and a lower cross member 30 that are arranged to face each other in the vehicle vertical direction with the rear floor panel 18 interposed therebetween, and constitutes a part of the skeleton of the vehicle body rear portion 14. is doing.

  The upper cross member 28 is disposed with the vehicle width direction as a longitudinal direction, and includes a bulging portion 28A, a front flange portion 28B, and a rear flange portion 28C. It is made into the substantially hat shape by which the side was open | released. More specifically, the bulging portion 28A includes an upper wall portion 28A1 that constitutes the vehicle upper side, a front wall portion 28A2 that constitutes the vehicle front side, and a rear wall portion 28A3 that constitutes the vehicle rear side. ing. A front flange portion 28B extends from the peripheral portion on the vehicle lower side of the front wall portion 28A2 to the vehicle front side, and a rear flange portion 28C extends from the peripheral portion on the vehicle lower side of the rear wall portion 28A3 to the vehicle rear side. It has been extended. The upper cross member 28 configured as described above extends in the vehicle width direction from the rear floor panel 18 by joining the front flange portion 28B and the rear flange portion 28C to the rear floor panel 18 by joining means such as welding. The closed cross-sectional structure is configured. A gap filling member 54 is attached to the rear wall portion 28A3 of the upper cross member 28 as will be described later.

  On the other hand, the lower cross member 30 is basically symmetric with respect to the upper cross member 28 and the rear floor panel 18, and includes a bulging portion 30A, a front flange portion 30B, and a rear flange portion 30C. It is a hat shape with the vehicle upper side opened. The dimension of the bulging portion 30A of the lower cross member 30 in the vehicle vertical direction is set to be larger than the dimension of the bulging portion 28A of the upper cross member 28 in the vehicle vertical direction. The lower cross member 30 configured as described above extends in the vehicle width direction with the front floor portion 30B and the rear flange portion 30C joined to the rear floor panel 18 by joining means such as welding. A closed cross-sectional structure is configured. Further, as described above, since the lower cross member 30 is disposed so as to face the upper cross member 28 in the vehicle vertical direction, the upper cross member 28 and the lower cross member 30 form a closed cross-sectional structure. You can also think that

  Here, in this embodiment, a space on the vehicle rear side of the floor cross member 26 and on the vehicle upper side of the rear floor panel 18 is a storage space for the spare tire 32. In this embodiment, the gap filling member 54 used for supporting the spare tire 32 is characterized. Hereinafter, an example of the structure of the spare tire storage unit will be described in detail with a focus on the configuration of the gap filling member 54 constituting the main part of the present embodiment.

  As shown in FIG. 1, the spare tire 32 is placed on the vehicle upper side of the rear floor panel 18 and is stored in a state of being fixed by a clamp bolt 34 and a clamp bracket 36. As shown in FIG. 4, the clamp bracket 36 is disposed at a substantially central portion of the rear floor panel 18. The clamp bracket 36 is made of a steel material and includes a bracket portion 38 and a weld nut 40 attached to the rear floor panel 18 by a joining means such as welding. The weld nut 40 is provided on the surface of the upper wall portion 38A constituting the vehicle upper side portion of the bracket portion 38 on the vehicle lower side, and the axial direction thereof is disposed in the vehicle vertical direction.

  On the other hand, the clamp bolt 34 includes a cylindrical bolt portion 42 made of metal and provided with a thread groove on the surface, and a resin grip portion 44 provided at one end of the bolt portion 42. It is configured. The clamp bolt 34 is inserted from the upper side of the vehicle into the welded portion 40 formed in the center of the disk portion 48 of which the bolt portion 42 forms the wheel portion 46 of the spare tire 32, and is connected to the weld nut 40 of the clamp bracket 36. It is screwed. Then, the clamp tire 34 is rotated until the grip 44 presses the peripheral wall portion of the recess 52 provided at the center of the disk portion 48, so that the spare tire 32 is pressed against the rear floor panel 18. It can be fixed. That is, the clamp bolt 34 and the clamp bracket 36 function as a restricting unit that restricts relative movement of the spare tire 32 with respect to the rear floor panel 18. The displacement of the spare tire 32 in the vertical direction of the vehicle is mainly restricted by the clamp bolt 34 and the clamp bracket 36, and a convex portion (bead portion) is provided on the rear floor panel 18 as appropriate, so that the spare tire mainly has the vehicle longitudinal direction and the vehicle width. It is also possible to adopt a configuration that regulates the displacement in the direction.

  Further, the spare tire 32 is disposed at a distance from the floor cross member 26 on the vehicle rear side in a state of being fixed to the rear floor panel 18 as described above. A gap filling member 54 is disposed in the gap between the floor cross member 26 and the spare tire 32.

  As shown in FIGS. 2 and 4, the gap filling member 54 is basically formed in a rectangular parallelepiped shape whose longitudinal direction is the vehicle width direction and is made of hard urethane. Further, as shown in FIG. 3, the gap filling member 54 has two recesses 56 opened in the upper surface portion 54 </ b> A facing the vehicle upper side, spaced in the longitudinal direction of the gap filling member 54. Open and formed. Specifically, the recess 56 has a rectangular shape in plan view and is formed in a trapezoidal shape that is widened toward the vehicle upper side in a cross-sectional view in the longitudinal direction of the gap filling member 54. Further, the gap filling member 54 is formed with an insertion portion 58 penetrating from the front circumferential wall portion 56A constituting the inner circumferential wall of the concave portion 56 on the vehicle front side to the front surface portion 54B facing the vehicle front side of the gap filling member 54. Has been. On the other hand, a weld nut 60 is provided on the surface on the vehicle front side of the rear wall portion 28A3 of the upper cross member 28 so as to correspond to the inserted portion 58. Then, the bolt 62 (fastening member) is inserted into the inserted portion 58 from the front peripheral wall portion 56 </ b> A side of the recess 56 and screwed into the weld nut 60, so that the gap filling member 54 is attached to the floor cross member 26. Yes. That is, the gap filling member 54 is supported at a plurality of locations with respect to the floor cross member 26.

  Further, the gap filling member 54 is configured such that the lower surface portion 54 </ b> C facing the vehicle lower side thereof is in surface contact with the rear floor panel 18 in a state where the gap filling member 54 is attached to the floor cross member 26. On the other hand, the front surface portion 54B of the gap filling member 54 and the front peripheral wall portion 56A of the recess 56 are parallel to the rear wall portion 28A3 of the upper cross member 28 in a state where the gap filling member 54 is attached to the floor cross member 26. It is formed to be arranged. The inserted portion 58 provided in the gap filling member 54 has an axial direction of the weld nut 60 provided in the floor cross member 26 in a state where the gap filling member 54 is attached to the floor cross member 26. Is formed to match. Further, in this embodiment, the recess 56 is provided as a space for attaching the bolt 62, but instead of providing the recess 56, the inserted portion 58 is formed through the gap filling member 54, and the bolt is inserted from the inserted portion 58. A configuration of attaching 62 is also possible.

  Further, as shown in FIGS. 2 and 3, the front surface portion 54B of the gap filling member 54 is provided with a convex portion 64 that is continuous along the peripheral edge portion of the front surface portion 54B. It is formed in a rectangular frame shape when viewed from the front surface portion 54B side. The convex portion 64 has a rectangular shape in which the cross-sectional shape viewed in the direction along the peripheral edge of the front surface portion 54B has a circular arc shape on the tip side opposite to the front surface portion 54B. In the state where the gap filling member 54 is attached to the floor cross member 26, the tip end portion of the convex portion 64 is in contact with the rear wall portion 28 </ b> A <b> 3 of the upper cross member 28. In other words, in a state where the gap filling member 54 is attached to the floor cross member 26, a predetermined gap is provided between the rear wall portion 28 </ b> A <b> 3 of the upper cross member 28 and the front surface portion 54 </ b> B of the gap filling member 54. It is in a state. For this reason, when the bolts 62 are tightened, the pressing force applied to the gap filling member 54 can be dispersed and applied to the gap filling member 54. As a result, the gap filling member 54 is stabilized in the floor cloth. The member 26 can be fixed. In addition, the convex part 64 may be provided intermittently.

  On the other hand, the rear surface portion 54 </ b> D facing the vehicle rear side of the gap filling member 54 functions as a contact surface portion that comes into contact with the tire portion 66 constituting the spare tire 32. Specifically, the rear surface portion 54 </ b> D of the gap filling member 54 is formed along an arc having substantially the same radius as the tire radius when the spare tire 32 is unloaded in plan view. In other words, the rear surface portion 54 </ b> D of the gap filling member 54 is formed along the tread surface 68 </ b> A of the tread portion 68 in the tire portion 66. Further, the gap filling member 54 is disposed at a position where the distance between the rear surface portion 54D and the clamp bracket 36 used for fixing the spare tire 32 is shorter than the tire radius when the spare tire 32 is not loaded in plan view. ing. Therefore, in a state where the spare tire 32 is fixed, the gap filling member 54 is compressed and deformed, and the tire portion 66 of the spare tire 32 is elastically deformed, and the rear surface portion 54D of the gap filling member 54 is the tread of the tire portion 66. The surface is in close contact along the surface 68A. That is, the vehicle front side portion of the spare tire 32 is supported while being pressed by the gap filling member 54.

  Further, the peripheral portion 54D1 on the vehicle upper side in the rear surface portion 54D of the gap filling member 54 has a conical surface shape whose diameter is reduced toward the vehicle lower side, and the spare tire 32 is pushed in from the upper side of the gap filling member 54. When the resistance is small, it is configured. Note that the resistance when the spare tire 32 is fixed can also be reduced by chamfering the peripheral edge portion 54D1 of the rear surface portion 54D or by configuring the peripheral edge portion 54D1 in a shape conforming thereto. Moreover, the structure which the cross-sectional shape which looked at the peripheral part 54D1 in the direction along the said peripheral part 54D1 becomes a circular arc shape which protrudes in the vehicle rear side can also be taken.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  In the present embodiment, as shown in FIG. 1, a floor cross member 26 extending in the vehicle width direction is provided on the rear floor panel 18 constituting the vehicle body 12. A spare tire 32 is placed on the rear floor panel 18 at a distance from the floor cross member 26 in the longitudinal direction of the vehicle. Further, relative movement of the spare tire 32 with respect to the rear floor panel 18 is restricted by the clamp bolt 34 and the clamp bracket 36. For this reason, when the rear floor panel 18 is vibrated by the drive system of the vehicle 10 or the like, the wheel portion 46, the tire portion 66, and the rear floor panel 18 of the spare tire 32 become a vibration system with one degree of freedom in the vehicle vertical vibration. Function. Specifically, a one-degree-of-freedom vibration system is configured in which the wheel portion 46 is a mass, and the tire portion 66 and the rear floor panel 18 are expanded and contracted in the vehicle vertical direction and springs are arranged in series.

  By the way, when the resonance frequency of the vibration system configured as described above exists in a low frequency band, it is considered that the sound generated by the vibration of the rear floor panel 18 becomes a muffled sound. As a method of reducing this booming noise, increasing the resonance frequency of the vibration system can be mentioned. The resonance frequency of the vibration system is inversely proportional to the half power of the mass constituting the vibration system, and proportional to the half power of the spring constant of the spring constituting the vibration system. The resonance frequency can be increased by increasing the spring constant of the spring constituting the system.

  For example, it is conceivable to provide a convex bead having a contact surface portion along the tread surface 68A of the tire portion 66 on the rear floor panel 18. According to such a configuration, the contact portion between the tread portion 68 and the contact surface portion constituting the tire portion 66 functions as a spring arranged in parallel with the spring of the vibration system, and the spring constituting the vibration system The spring constant of can be increased.

  However, when such a configuration is adopted, it is necessary to set the shape of the convex bead according to the type of tire adopted for the spare tire 32.

  In this embodiment, the spare tire 32 includes a gap filling member 54 provided with a rear surface portion 54D along the tread surface 68A. The gap filling member 54 is formed between the floor cross member 26 and the spare tire 32. It is arranged in the gap. For this reason, the contact portion of the tread portion 68 of the spare tire 32 with the rear surface portion 54D can function as a spring arranged in parallel to the vibration system spring constituted by the spare tire 32 and the rear floor panel 18. .

  More specifically, when the spare tire 32 is attached to the rear floor panel 18, the rear surface portion 54 </ b> D of the gap filling member 54 is in close contact with the tread surface 68 </ b> A of the tire portion 66 of the spare tire 32. ing. For this reason, when the spare tire 32 is vibrated and the spare tire tries to move relative to the gap filling member 54 in the vehicle vertical direction, the rear surface portion 54D of the gap filling member 54 and the tread surface 68A of the spare tire 32 are formed. A frictional force in the vertical direction of the vehicle acts between them. By receiving this frictional force, the tire portion 66 elastically deforms the peripheral portion of the tread surface 68A that is in contact with the rear surface portion 54D, and the peripheral portion operates like a spring that expands and contracts in the vehicle vertical direction. Further, when the peripheral portion of the tread surface 68A in contact with the rear surface portion 54D is viewed as a spring, the spring has a configuration in which one end portion is connected to the tire portion 66 and the other end portion is connected to the gap filling member 54. Become. That is, the spring formed in the peripheral portion of the tread surface 68A in contact with the rear surface portion 54D can be regarded as being connected in parallel to the spring formed of the tire portion 66 and the rear floor panel 18. Therefore, in the present embodiment, the spring constant of the spring constituting the vibration system including the rear floor panel 18 can be increased, and consequently the resonance frequency of the vibration system can be increased.

  In addition, the gap filling member 54 is attached to the floor cross member 26 because it is attached with the bolts 62. For this reason, even if the type of tire employed in the spare tire 32 is different, the vibration system can be replaced without changing the configuration of the rear floor panel 18 by replacing the gap filling member with a shape corresponding to the type of each tire. The resonance frequency can be increased. As described above, in the spare tire storage unit structure according to the present embodiment, it is possible to reduce the booming noise accompanying the vibration of the rear floor panel 18 while achieving both versatility and cost reduction.

10 vehicle 12 vehicle body 18 rear floor panel (floor panel)
26 Floor cross member 32 Spare tire 34 Clamp bolt (regulation means)
36 Clamp bracket (regulation means)
54 Gap filling member 54D Rear surface portion (contact surface portion)

Claims (2)

A floor cross member provided on the floor panel constituting the vehicle body and extending in the vehicle width direction;
Restricting means for restricting relative movement of the spare tire placed on the floor panel with an interval in the vehicle longitudinal direction with respect to the floor cross member;
A gap filling member that is disposed in a gap between the floor cross member and the spare tire and includes a contact surface portion along a tread surface of the spare tire, and is detachable from the floor cross member;
I have a,
The contact surface portion is in contact with the tread surface in a state where the gap filling member is disposed in the gap.
Spare tire storage structure. The gap filling member is solid,
The spare tire storage structure according to claim 1.

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