JP2010089558A - Tire cushion material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire cushion material whose outer peripheral corner parts can hardly be chipped at the time of dropping and/or hooking. <P>SOLUTION: The cushion material 1 of a spare tire 4 has a body 10 made of a foamed synthetic resin comprising a center part 11, which supports the wheel part 40 of the tire, and retaining parts 12, which receive the tire part 41. At least a part of the peripheral edges of the body 10 is formed in a step shape comprising a first face 2, whose upper face is flat and whose peripheral edge is round, and second faces 20, which are roughly flat being positioned outside from the first face 2 and at the lower position. A plurality of retaining parts 12, 12 are provided and a plurality of the first faces 2, 2 are provided on the second faces 20 of the retaining parts 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tire cushion material that is supported by a storage portion at the bottom of a trunk of a vehicle in a posture in which a tire, in particular, a spare tire for a vehicle is placed sideways.

Conventionally, it has been known that a spare tire for emergency driving is stored in a storage portion provided by denting the bottom of the rear trunk of the passenger compartment, and the spare tire is attached to the lower surface of the storage portion. Supported by cushion material. FIG. 10 is a plan view of the support structure of the spare tire (4), and FIG. 11 is a cross-sectional view of the spare tire (4) support structure of FIG. 10 cut along a vertical plane including line AA. 10 and 11, the left-right direction corresponds to the front-rear direction of the vehicle. For convenience of illustration, in FIG. 10, the spare tire (4) is indicated by an alternate long and short dash line.
The upper portion of the storage portion (5) is closed by the lid (50), and the lid (50) is in a closed state and is positioned in substantially the same plane as the carpet (6) covering the floor of the passenger compartment floor. To do. As is well known, the spare tire (4) is composed of a metal wheel part (40) penetrating a through hole (42) in the center and a rubber tire part (41) surrounding the wheel part (40). The lower surface of the tire portion (41) is placed on the cushion material (1). The wheel portion (40) is made of iron or aluminum, but the material is not limited to these.
The cushion material (1) has a through hole (15) in the center, and the screw (52) that passes through the through hole (42) and the through hole (15) of the wheel part (40) is provided in the storage part (5). The spare tire (4) is fixed onto the cushion material (1) by screwing into the protrusion (51) located at the bottom of the cushion. The cushion member (1) protects the tire portion (41) even if the storage portion (5) is shaken during traveling of the vehicle.
In FIG. 11, the spare tire (4) is tilted and attached to the cushion material (1) so that the rear part is lifted with respect to the lower surface of the storage part (5). This is because the front and rear width of the storage part (5) is limited. Therefore, if there is a margin in the front-rear width of the storage section (5), the spare tire (4) may be attached flatly to the cushion material (1).

  FIG. 12 is a perspective view of a conventional cushion material (1). The cushion material (1) is formed of a synthetic resin such as foamed resin, and includes a main body (10) in which holding portions (12), (12), and (12) are radially extended from a center portion (11) in three directions. As shown in FIG. 13, each holding portion (12) has a rectangular shape whose lateral cross section decreases downward, and is angular so that the side corners form an acute angle. The main body (10) is generally manufactured by injection molding using the molds (3) and (30), and in view of the draft angle of the molds (3) and (30), the cross section is downward. It has a shape that is much smaller. Further, the outer peripheral corner of the central portion (11) is also angular.

JP 2007-91072 A

If the conventional cushioning material (1) is accidentally dropped during production using a mold and / or during transportation to a factory that manufactures a vehicle, it may collide with the ground and cause chipping at the outer corner. Further, when the cushion material (1) is transported, the outer peripheral corner portion is accidentally hooked on the surrounding objects, which may cause chipping, and the cushion material (1) itself may be defective. That is, since the outer periphery of the cushion material (1) is chipped and the appearance is impaired, there is a possibility that acceptance is rejected as an appearance defect at the time of delivery to a factory for manufacturing a vehicle.
An object of the present invention is to provide a cushion material that is less likely to cause chipping of the outer peripheral corners when dropped and / or hooked.

It has a foamed synthetic resin main body (10) having a central part (11) for supporting the wheel part (40) of the tire and a holding part (12) for receiving the tire part (41). At least a part of the peripheral portion includes a first surface portion (2) having a flat upper surface and a rounded peripheral edge, and a substantially flat second surface located outside and at a lower position than the first surface portion (2). It is formed in a step shape including the surface portion (20).
The main body (10) includes a plurality of holding portions (12), and a plurality of first surface portions (2) are provided on the second surface portion (20) of the holding portions (12).

In the tire cushion material according to claim 1, when the main body (10) is accidentally dropped, the main body (10) is either the peripheral portion of the first surface portion (2) or the peripheral portion of the second surface portion (20). Collides with the ground. Since the peripheral portion of the first surface portion (2) is rounded, it is difficult to chip even if it collides with the ground. That is, since the chipping occurs only when the peripheral edge of the second surface portion (20) collides with the ground, the ratio of chipping can be reduced as compared with the conventional case. Similarly, when the outer peripheral corner of the main body (10) is accidentally caught by a surrounding object, the rate of occurrence of chipping can be reduced as compared with the conventional case.
In the tire cushion material according to claim 2, since the plurality of first surface portions (2) whose peripheral portions are rounded are formed, the ratio of occurrence of chipping is larger than in the case where there is one first surface portion (2). Can be reduced.

FIG. 1 is a perspective view of a cushion material (1) according to this example, and FIG. 2 is a plan view of the cushion material (1). The wearing state of the cushion material (1) is the same as the state shown in FIG.
The main body (10) of the cushion material (1) is formed of a synthetic resin such as foamed resin, and extends the holding portions (12), (12), and (12) radially from the center portion (11) in three directions. The center portion (11) supports the wheel portion (40) (see FIG. 11) of the tire, and the holding portion (12) receives the tire portion (41). A recess (14) is formed between the center portion (11) and the holding portion (12) corresponding to the wheel portion (40), and the cushion material (1) supports the spare tire. Indicates. In FIG. 2, the tire portion (41) (see FIG. 11) of the spare tire (4) is in contact with a portion D indicated by a one-dot chain line on the holding portion (12). A stepped portion (13) is formed on the periphery of the central portion (11) and the holding portion (12).

3 is a cross-sectional view of the holding portion (12) of FIG. 1 taken along the vertical plane including the line CC and viewed from the direction of the arrow. Specifically, the step portion (13) has a flat upper surface positioned substantially in the same plane as the upper surface of the main body (10), a rounded first surface portion (2), and the first surface portion. A substantially flat second surface portion (20) located outside and at a lower position than (2). The roundness of the periphery of the first surface portion (2) directs the bulge outward.
The width W of the second surface portion (20) is set to 1-10 mm, and is actually about 3 mm. The height H of the first surface portion (2) and the second surface portion (20) is set to 1-5 mm, and is actually about 3 mm.
When the main body (10) is accidentally dropped, the main body (10) collides with the ground at either the peripheral portion of the first surface portion (2) or the peripheral portion of the second surface portion (20). Since the peripheral portion of the first surface portion (2) is rounded, it is difficult to chip even if it collides with the ground. That is, since the chipping occurs only when the peripheral edge of the second surface portion (20) collides with the ground, the ratio of chipping can be reduced as compared with the conventional case. Similarly, when the outer peripheral corner of the main body (10) is accidentally caught by a surrounding object, the rate of occurrence of chipping can be reduced as compared with the conventional case.

FIG. 4 is a cross-sectional view of the molds (3) and (30) for molding the main body (10), and shows a cavity for molding the holding portion (12). The cavity (31) between the molds (3) and (30) is filled with foamed resin, and the holding part (12) of the main body (10) is molded, and one mold (3) is the other mold ( 30) and the lateral displacement is restricted. In the molds (3) and (30) shown in FIG. 4, there is no portion forming an acute angle in the portion where the holding part (12) is molded, and the molds (3) and (30) can be made to last longer.
Accordingly, as shown in FIG. 5, the main body (10) having the second surface portion (20) having a rounded peripheral edge portion is not preferable because the outer peripheral edge of the mold is sharp. If the peripheral portion of the second surface portion (20) is also rounded, the rate of chipping can be further reduced when the main body (10) is dropped. However, this is not preferable for the following reasons.
6 is a cross-sectional view of a mold that forms the holding portion of FIG. If the main body (10) having the shape shown in FIG. 5 is to be provided by resin molding, as shown in FIG. 6 B1) is provided, and the mold (3) is easily damaged. In this case, as shown by the alternate long and short dash line in FIG. 6, this problem can be solved by increasing the width of the mold (3), but this leads to an increase in the size of the mold (3), which is not preferable. Therefore, in the molds (3) and (30) shown in FIG. 3, the second surface portion (20) forms a substantially flat main body (10).

In the above example, one first surface portion (2) is formed on the second surface portion (20) of each holding portion (12). However, the following shape may be used instead. 7, FIG. 8, and FIG. 9 are enlarged plan views of the holding portion (12) of another embodiment, and correspond to the E portion of the holding portion (12) of FIG. For convenience of illustration, the first surface portion (2) is indicated by hatching. In the holding part (12) of FIG. 7, four first surface parts (2) are arranged on the second surface part (20) so as to protrude away from each other, and two are provided along the longitudinal direction of the holding part (12). Two second surface portions (20) are respectively provided along the width direction of the holding portion (12).
In the holding portion (12) of FIG. 8, a plurality of narrow first surface portions (2) and (2) extending in the width direction of the holding portion (12) are arranged in parallel along the longitudinal direction of the holding portion (12). And disposed on the second surface portion (20). In the holding part (12) of FIG. 9, the first surface part (2) is formed only at the place (corresponding to the D part of FIG. 2) where the tire part (41) of the spare tire (4) contacts. That is, in the holding part (12) of FIG. 9, the step part (13) is formed in a part of the peripheral part.

  In addition, the foaming resin used by this example can use the foamable particle used for the conventional foaming resin shaping | molding. The expandable particles are obtained by impregnating a synthetic resin with a physical foaming agent, and are foamed by heating, and include pre-expanded particles. In the production method of the present invention, pre-expanded so-called pre-expanded particles are mainly used. Examples of the synthetic resin constituting the expandable particles include polystyrene resins such as polystyrene, high impact polystyrene, styrene-ethylene copolymer, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, polyethylene, Examples thereof include polyolefin resins such as polypropylene and ethylene-vinyl acetate copolymer, polyester resins such as polyethylene terephthalate, polylactic acid resins, and a composite resin of polystyrene and polyolefin.

Examples of the physical foaming agent include aliphatic hydrocarbons such as propane, butane, pentane and hexane; aliphatic cyclized hydrogens such as cyclopentane and cyclobutane; trichlorofluoromethane, dichlorodifluoromethane, dichlorotetrafluoro And halogenated hydrocarbons such as methane, trichlorotrifluoroethane, methyl chloride, methylene chloride, and ethyl chloride. The foam molding conditions may be the same as the conventional one.

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

It is a perspective view of the cushion material concerning this example. It is a top view of the cushion material concerning this example. It is sectional drawing which fractured | ruptured the holding | maintenance part of FIG. It is sectional drawing of the metal mold | die which shape | molds a main body, and shows the cavity which shape | molds a holding | maintenance part. It is sectional drawing which shows an unpreferable holding | maintenance part. It is sectional drawing of the metal mold | die which forms the holding | maintenance part of FIG. It is an enlarged plan view of the holding part of another embodiment. It is an enlarged plan view of the holding part of another embodiment. It is an enlarged plan view of the holding part of another embodiment. It is a top view of the support structure of a spare tire. It is sectional drawing which fractured | ruptured the support structure of the spare tire of FIG. It is a perspective view of the conventional cushion material. It is sectional drawing which fractured | ruptured the cushion material of FIG. 12 in the vertical surface containing a BB line, and was seen by the arrow.

Explanation of symbols

(1) Cushion material
(2) First face
(4) Spare tire
(10) Main unit
(12) Holding part
(20) Second side

Claims (4)

It has a foamed synthetic resin main body having a central portion for supporting the wheel portion of the tire and a holding portion for receiving the tire portion, and at least a part of the peripheral portion of the main body has a flat upper surface and a rounded periphery. A tire cushion material, comprising: a first surface portion having a shape; and a substantially flat second surface portion located outside and at a lower position than the first surface portion. The tire cushion material according to claim 1, wherein the main body includes a plurality of holding portions, and a plurality of first surface portions are provided on a second surface portion of the holding portions. The tire cushion material according to claim 2, wherein a plurality of first surface portions are arranged in the width and / or longitudinal direction of the holding portion. The tire cushion material according to claim 2, wherein the first surface portion extends in the width direction of the holding portion and is arranged in a plurality along the longitudinal direction.

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