REAR VEHICLE BODY CONNECTION STRUCTURE

Abstract

Rear vehicle body connecting structure (10) comprising: a rear transverse extension (40) which connects a pillar member (20) arranged in a vertical direction of the vehicle body to a transverse member (30) arranged in a width direction of the vehicle body at a rear of the vehicle body and from which a seat belt mounting portion (42) is formed, and a reinforcing cross extension (60) mounted on one side of the rear cross extension (40) and a lower portion of which is connected to a floor panel (130).

Description

BACKGROUND OF THE INVENTIONField of the InventionThe present invention relates to a rear vehicle body connection structure (e.g., a rear vehicle body connection structure). More particularly, the present invention relates to a rear vehicle body connecting structure configured to reinforce the strength (e.g., rigidity) of the vehicle body connecting portion and to function to mount the seatbelt.Description of Related ArtIn general, the seatbelt mounted at the rear of the vehicle body is a structure protruding into the interior, and the protruding seatbelt reduces the luggage compartment and deteriorates the commercial characteristics.The configuration connecting the pillar member at the rear of the vehicle body and the cross member disposed in the width direction of the vehicle body has insufficient connection with the floor, so that additional reinforcement is required to improve durability performance.The information contained in this Background of the Invention section is merely for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.JP 2019-182016 A discloses a structure of a rear vehicle body part including rear pillars forming left and right side parts of a rear doorway, and side windows each provided at the vehicle rear side of a side body. The rear pillar includes a rear pillar inner panel and a rear pillar outer panel and a rear end part of the side body. The rear pillar inner panel is disposed at the vehicle rear side relative to a rear end of the side window. A front wall part is provided with an opening for a retractor attachment. A retractor attachment part is provided around the retractor attachment opening on a front surface of the front wall part. A seat belt retractor attached to the retractor attachment part is accommodated in a space surrounded by the inner panel and the outer panel.EXPLANATION OF THE INVENTIONThe present invention has an object to provide a rear vehicle body connecting structure (e.g., a rear vehicle body connecting structure) for securing (e.g., securing) a luggage compartment by moving (e.g., displacing) the seat belt mounting position to the intersection position (e.g., to the connection position, e.g., to the connection location) of the pillar member (e.g., the C pillar, e.g., the D pillar) and the cross member, and for improving connection (e.g., connectivity) to the floor (e.g., to the floor panel).A rear vehicle body connection structure (e.g., a rear vehicle body connection structure) according to the present invention includes: a rear cross extension that connects a pillar member (e.g., a C pillar, e.g., a D pillar) disposed in a vertical direction of the vehicle body to a cross member disposed in a width direction of the vehicle body at a rear of the vehicle body and of which (e.g., in which) a seatbelt mounting portion (is formed); and a reinforcing cross extension that is mounted on (e.g., at) one side of the rear cross extension and of which a lower portion is connected to a floor panel.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include: a combination lamp panel connected to the pillar member, wherein an upper portion of the reinforcement cross extension is connected to the combination lamp panel.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include: a side outer member connected to the combination lamp panel, wherein a portion of the reinforcement cross extension is connected to the side outer member.The seatbelt mounting portion may include a seatbelt mounting hole formed in the rear cross extension (configured), wherein a retractor (e.g., retractor) of a seatbelt is provided within the seatbelt mounting hole.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include: a rear bulkhead piece (e.g., a rear bulkhead, e.g., a rear bulkhead, e.g., a rear bulkhead) mounted on an inner side (e.g., inside) of the rear bulkhead opposite (e.g., opposite) to the reinforcing bulkhead.The rear cross extension may include: a front cross portion connected to the floor panel; and an upper curve formed by being bent (e.g., curved) from the front cross portion and being curved (e.g., curved) to connect the pillar member and the cross member (to each other).The rear bulkhead piece may include a front transverse flange connected to the front transverse portion and an upper transverse flange connected to the upper bend.The upper transverse flange may include a first transverse flange connected to a lower portion of the upper bend and a second transverse flange spaced from the first transverse flange and connected to an upper portion of the upper bend.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include a rear panel disposed rearward of the cross member, the rear cross wall piece further including a rear cross flange connected to the rear panel.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include a rear floor reinforcement that is connected to the floor panel and that is coupled to the front cross flange of the rear cross panel.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include a rear lower side bulkhead piece (e.g., a rear lower side bulkhead reinforcement, e.g., a rear lower side bulkhead, e.g., a rear lower side bulkhead) mounted to a lower portion of the seatbelt mounting hole inside the rear bulkhead extension.The rear lower side bulkhead piece may connect (together) the reinforcement bulkhead extension, the rear bulkhead extension, and the rear bulkhead piece.The rear lower side bulkhead piece may include a lower outer flange connected to the reinforcement bulkhead piece, a lower front flange connected to the rear bulkhead piece, and a lower inner flange connected to the rear bulkhead piece.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include a mounting bracket that engages with the rear cross extension to mount the seatbelt.The rear vehicle body connection structure according to various exemplary embodiments of the present invention may further include a rear upper side bulkhead piece (e.g., a rear upper side bulkhead reinforcement, e.g., a rear upper side bulkhead, e.g., a rear upper side bulkhead) mounted to an upper portion of the seatbelt mounting hole inside the rear bulkhead extension.The rear upper side bulkhead may include an upper outer flange connected to the reinforcement bulkhead, an upper front flange connected to the rear bulkhead, and an upper inner flange formed (formed) on an opposite side (e.g., on an opposite surface) of the upper outer flange (e.g., on a side / surface of the rear upper side bulkhead that is opposite to the side / surface of the rear upper side bulkhead, on / on which the upper outer flange (formed)) is formed and connected to the rear bulkhead.The pillar member may further include an inner lower side panel (e.g., an inner lower fender) connected to the rear cross extension, wherein the upper front flange and the upper inner flange are connected to the rear cross extension and the inner lower side panel.A rear vehicle body connection structure (e.g., a rear vehicle body connection structure) according to various exemplary embodiments of the present invention may include: a rear cross extension connecting a pillar member and a cross member at a rear of a vehicle body and (which) has a seatbelt mounting hole; and a plurality of reinforcing portions mounted adjacent to (e.g., adjacent to) the seatbelt mounting hole and forming a mounting space surrounding a retractor of a seatbelt inserted into the seatbelt mounting hole.The plurality of reinforcing portions may include a reinforcing cross extension mounted on a side of the rear cross extension and a lower portion of which is connected to a floor panel, a rear cross panel piece (e.g., a rear cross reinforcement, e.g., a rear cross wall, e.g., a rear cross partition wall) mounted on an inner side (e.g., inside) of the rear cross extension opposite to the reinforcing cross extension, a rear lower side cross panel piece (e.g., a rear lower side cross reinforcement, e.g., a rear lower side cross wall, e.g., a rear lower side cross partition wall) mounted on a lower portion of the seatbelt mounting hole inside the rear cross extension, and a rear upper side bulkhead piece (e.g., a rear upper side bulkhead reinforcement, e.g., a rear upper side bulkhead, e.g., a rear upper side bulkhead) mounted to an upper portion of the seat belt mounting hole inside the rear bulkhead extension.According to the rear vehicle body connection structure according to various exemplary embodiments of the present invention, it is possible to ensure (e.g., ensure) a luggage compartment by moving (e.g., displacing) the position for mounting the seatbelt to the crossing position (e.g., the connection position, e.g., the connection location) of the pillar member (e.g., the C pillar, e.g., the D pillar) and the cross member.Moreover, according to the rear vehicle body connection structure according to various exemplary embodiments of the present invention, it is possible to improve the structural strength (e.g., the structural rigidity) of the pillar member and the cross member and improve the connection (e.g., the connectivity) to the floor.Moreover, for the effects that may be achieved or predicted based on various exemplary embodiments of the present invention, these are to be disclosed directly or implicitly in the detailed description of various exemplary embodiments of the present invention. That is, various effects predicted according to various exemplary embodiments of the present invention will be disclosed within a detailed description to be described later.The methods and apparatuses of the present invention have other features / characteristics and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention.Brief Description of the DrawingsFIG. 1 is a rear view of a rear vehicle body connection structure (e.g., a rear vehicle body connection structure) according to various exemplary embodiments of the present invention. FIG. 2 is a perspective view of the rear vehicle body connection structure according to various exemplary embodiments of the present invention. FIG. 3 is a perspective view except for a seatbelt in the rear vehicle body connection structure according to various exemplary embodiments of the present invention. FIG. 4 is a perspective view except for a rear cross extension in the rear vehicle body connection structure according to various exemplary embodiments of the present invention. FIG. 5 is a front view except for a seatbelt and a rear cross extension in the rear vehicle body connection structure according to various exemplary embodiments of the present invention. FIG. 6 is a perspective view except for a seatbelt and a rear cross extension in the rear vehicle body connection structure according to various exemplary embodiments of the present invention. FIG. 7 is a rear perspective view of a rear vehicle body connection structure according to various exemplary embodiments of the present invention. FIG. 8 is a partial rear view of a rear vehicle body connection structure according to various exemplary embodiments of the present invention.It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features / characteristics illustrative of the basic principles of the invention. The specific design / design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment.In the figures, reference numerals refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.DETAILED DESCRIPTIONReference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below. Although the invention will be described in connection with exemplary embodiments of the present invention, it is to be understood that the present description is not intended to limit the present invention to these exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments of the present invention, but also various alternatives, modifications, and other embodiments, which may be included within the scope of the invention as defined by the appended claims.Exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As one skilled in the art will recognize, the described embodiments may be changed in various ways without departing from the spirit or scope of the present invention.In order to clearly explain various exemplary embodiments of the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the description.Since the size and thickness of each component shown in the drawings are arbitrarily given for convenience of description, the present invention is not necessarily limited to that shown in the drawings, and the thickness is enlarged (illustrated) to clearly express various parts and ranges.Moreover, in the detailed description below, the reason why the names of components are divided into "first / first / first", "second / second / second", etc. is to be classified into the same relationship, and are not necessarily limited to the order in the following description.Throughout the specification, when it is stated that a certain portion includes a certain constituent element (then), it means that other constituent elements may be further included instead of excluding other constituent elements unless otherwise stated.Moreover, terms such as "... part", "... means" described in the specification mean / denote a unit of a comprehensive configuration that performs at least one function or operation.When a part such as a layer, a film, a region, a plate, etc. is "on / on" another part (then), this includes the case where it is directly on / on the other part as well as the case where another part is interposed (disposed) therebetween.In contrast (to), when an element is referred to as being "directly on / on" another element, there are no (da) intermediate elements (then).Various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.FIG. 1 is a rear view of a rear vehicle body connection structure according to various exemplary embodiments of the present invention.Referring to FIG. 1, a rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention is configured to connect a pillar member (e.g., a C pillar, e.g., a D pillar) 20 disposed in a vertical direction of the vehicle body to the rear (e.g., the rear end) of the vehicle body and a cross member 30 disposed in the width direction of the vehicle body (e.g., to connect a pillar member 20 disposed in a vertical direction of the vehicle body to a cross member 30 disposed in the width direction of the vehicle body at the rear of the vehicle body). The cross member 30 supports (e.g., holds, e.g., supports) the rear of the vehicle body, and the tailgate, not shown, is closed, and the pillar member 20 is a pillar member disposed at the rearmost portion of the vehicle body, and may be, for example, a C-pillar or a D-pillar.FIG. 2 is a perspective view of the rear vehicle body connection structure according to various exemplary embodiments of the present invention.Referring to FIGS. 1 and 2, the rear vehicle body connection structure 10 may include a rear cross extension (e.g., a rear cross extension member) 40 of which (e.g., in which) a seatbelt mounting portion 42 is (formed), and a reinforcing cross extension (e.g., a reinforcing cross extension member) 60 mounted on the side of (e.g., on the side of, e.g., laterally on) the rear cross extension 40 and the lower portion of which is connected to a floor panel 130.The reinforcement cross extension 60 may be connected to the side (e.g., laterally on) of the rear cross extension 40 and the floor panel 130 to increase the connection strength (e.g., connection strength) of the rear cross extension 40 and the floor panel 130.Moreover, the seatbelt mounting portion 42 may be mounted at the connection position (e.g., at the connection location, e.g., in the connection region) of the pillar member 20 and the cross member 30 to ensure (e.g., ensure) a luggage compartment (e.g., a sufficient size of a luggage compartment).The seatbelt mounting portion 42 includes a seatbelt mounting hole 44 formed in the rear cross extension 40 (configured), and a retractor 152 of a seatbelt 150 may be provided within the mounting hole (e.g., the seatbelt mounting hole) 44. That is, the retractor 152 of the seatbelt 150 is provided within the seatbelt mounting hole 44 to ensure (e.g., ensure) more luggage space.FIG. 3 is a perspective view except for a seat belt in the rear vehicle body connection structure according to various exemplary embodiments of the present invention, and FIG. 4 is a perspective view except for a rear lateral extension in the rear vehicle body connection structure according to various exemplary embodiments of the present invention.FIG. 5 is a front view except for a seatbelt and a rear cross extension in the rear vehicle body connection structure according to various exemplary embodiments of the present invention, and FIG. 6 is a perspective view except for a seatbelt and a rear cross extension in the rear vehicle body connection structure according to various exemplary embodiments of the present invention.FIG. 7 is a rear perspective view of a rear vehicle body connection structure according to various exemplary embodiments of the present invention, and FIG. 8 is a partial rear view of a rear vehicle body connection structure according to various exemplary embodiments of the present invention.Referring to FIGS. 1 to 8, the rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention may further include a rear bulkhead piece (e.g., a rear bulkhead, e.g., a rear bulkhead, e.g., a rear bulkhead) 80 mounted on the opposite side of the reinforcement bulkhead 60 inside the rear bulkhead 40.The rear transverse extension 40 may include a front transverse portion 48 connected to the floor panel 130, and an upper bend 50 bent (e.g., curved) at (e.g., from) the front transverse portion 48 to connect (e.g., together) the pillar member 20 and the transverse member 30.The rear bulkhead piece 80 may include a front transverse flange 82 connected to the front transverse portion 48 and an upper transverse flange 84 connected to the upper bend 50.The upper transverse flange 84 may include a first transverse flange 86 connected to a lower portion of the upper bend 50, and a second transverse flange 88 spaced from the first transverse flange 86 and connected to an upper portion of the upper bend 50.That is, the rear bulkhead piece 80 may be / are joined (e.g., joined) to the front portion (e.g., the front bulkhead portion 48) and the curved portion (e.g., the curved portion, e.g., the upper curve 50) of the rear bulkhead extension 40 to increase the strength (e.g., stiffness) and the connection (e.g., the connectivity) of the rear bulkhead extension 40.The rear bulkhead piece 80 may / may be joined to the rear bulkhead extension 40 by welding, but is not limited thereto.The rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention further includes a rear panel 160 disposed rearward of the cross member 30, and the rear cross wall piece 80 may further include a rear cross flange 90 connected to the rear panel 160.That is, as shown in FIG. 6, the rear cross wall piece 80 has an approximately "U"-shaped cross section (e.g., a cross section having an approximately "U"-shape), and can increase the vehicle body strength (e.g., the vehicle body rigidity) by connecting (together) the rear cross extension 40 disposed in front of the vehicle body (e.g., the front-front direction of the vehicle body) and the rear panel 160 disposed in rear of the vehicle body (e.g., the rear direction of the vehicle body).The rear vehicle body connection structure 10 may further include a rear floor reinforcement 162 connected to the floor panel 130 and (which) bolted to the front cross flange 82 of the rear cross panel 80.That is, referring to FIGS. 2, 3, and 4, the bolt B may be / are connected to a front cross flange hole 83 formed at the front cross flange 82 (formed) to connect the rear floor reinforcement 162 and the rear cross wall piece 80 (to each other).The rear floor reinforcement 162 may connect the floor panel 130 and the rear bulkhead piece 80 (together) to ensure (e.g., ensure) the vehicle body connection and (to increase) the strength (e.g., the rigidity).Referring to FIGS. 6 and 8, the rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention may further include a rear lower side bulkhead piece (e.g., a rear lower side bulkhead reinforcement, e.g., a rear lower side bulkhead, e.g., a rear lower side bulkhead) 100 mounted to a lower portion of the seatbelt mounting hole 44 inside the rear bulkhead extension 40.The rear lower side bulkhead piece 100 may connect (together) the reinforcement bulkhead extension 60, the rear bulkhead extension 40, and the rear bulkhead piece 80.The rear lower side bulkhead piece 100 may include a lower outer flange 102 connected to the reinforcement bulkhead extension 60, a lower front flange 104 connected to the rear bulkhead extension 40, and a lower inner flange 106 connected to the rear bulkhead piece 80.Referring to FIGS. 2 to 5, the rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention may further include a mounting bracket 164 for coupling with the rear cross extension 40 to fasten the seatbelt 150.The seatbelt 150 may be / are attached to the mounting bracket 164 and the lower inner flange 106 may be / are mounted to the opposite side of the mounting bracket 164 to distribute the load via (e.g., from) the mounting bracket 164.Referring to FIG. 8, the rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention may further include a rear upper side bulkhead piece (e.g., a rear upper side bulkhead reinforcement, e.g., a rear upper side bulkhead, e.g., a rear upper side bulkhead) 120 mounted to an upper portion of the seatbelt mounting hole 44 inside the rear bulkhead extension 40.The rear upper side bulkhead piece 120 may include an upper outer flange 122 connected to the reinforcement cross extension 60, an upper front flange 124 connected to the rear cross extension 40, and an upper inner flange 126 formed (formed) on an opposite side of the upper outer flange 122 and connected to the rear cross extension 40.The pillar member 20 may further include an inner lower side trim (e.g., an inner lower fender) 134 connected to the rear cross extension 40, and the upper front flange 124 and the upper inner flange 126 may be connected to the rear cross extension 40 and the inner lower side trim 134.For example, the rear cross extension 40 and the inner lower side trim 134 may be connected by bolt holes 125 and 127 respectively formed (formed) in the upper front flange 124 and the upper inner flange 126. This can improve the connection (e.g., connectivity) and increase the vehicle body strength (e.g., vehicle body rigidity).Referring to FIGS. 2, 3, and 7, the rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention further includes a combination lamp panel 132 connected to the pillar member 20, and an upper portion of the reinforcement cross extension 60 may be connected to the combination lamp panel 132.The vehicle body connection structure 10 according to various exemplary embodiments of the present invention further includes a side outer member 140 connected to the combination lamp panel 132, and a portion of the reinforcement cross extension 60 may be connected to the side outer member 140.That is, the reinforcement cross extension 60 may be connected to the combination lamp panel 132 and the side outer 140 to increase the vehicle body strength (e.g., the vehicle body rigidity), and the reinforcement cross extension 60 may be further connected to the floor panel 130, whereby the vehicle body strength (e.g., the vehicle body rigidity) may be further increased.As described above, the rear vehicle body connection structure 10 according to various exemplary embodiments of the present invention has the seatbelt mounting hole 44 formed at (e.g., at the location of, e.g., at) the rear cross extension 40 connecting the pillar member 20 and the cross member 30 at the rear of the vehicle body, which are formed to make more use of the luggage compartment (e.g., to provide more luggage compartment).Moreover, a plurality of the above-described reinforcing portions are mounted adjacent to (e.g., adjacent to) the seat belt mounting hole 44 and form a mounting space 46 surrounding the retractor 152 of the seat belt 150 inserted into the seat belt mounting hole 44 to form a mounting space 46 with the pillar member 20, so that the connection strength (e.g., connection rigidity) of the cross member 30 can be increased.That is, the reinforcement cross extension 60, the rear cross wall piece 80, the rear lower side cross wall piece 100, and the upper side cross wall piece 120 form the plurality of reinforcement portions to improve the connection strength (e.g., connection rigidity) of the pillar member 20 and the cross member 30, and to stably (e.g., fixedly) mount the seatbelt 150. That is, the plurality of reinforcing portions form an approximately square mounting space 46, so that it is possible to increase the vehicle body strength (e.g., the vehicle body rigidity) and to increase the luggage space.For convenience in explanation and accurate definition in the appended claims, the terms "upper,...", "lower,...", "inner,...", "äußer...""upper," "lower," "upward," "downward," "front,...", "rear," "inner," "outer," "inward / inward," "outward / outward," "inner," "outer / outer," "external," "forward / forward," and "rearward / rearward" are used to describe features / features of the exemplary embodiments with reference to positions of such features / features as shown in the drawings. It is further understood that the term "connect" or its variations refers to both a direct and an indirect connection.

Claims

A rear vehicle body connection structure (10) comprising: a rear cross extension (40) that connects a pillar member (20) disposed in a vertical direction of the vehicle body to a cross member (30) disposed in a width direction of the vehicle body at a rear of the vehicle body and from which a seatbelt mounting portion (42) is formed; and a reinforcing cross extension (60) that is mounted on a side of the rear cross extension (40) and of which a lower portion is connected to a floor panel (130).The rear vehicle body connection structure (10) according to claim 1, further comprising: a combination lamp panel (132) connected to the pillar member (20), wherein an upper portion of the reinforcement cross extension (60) is connected to the combination lamp panel (132).The rear vehicle body connection structure (10) according to claim 2, further comprising: a side outer member (140) connected to the combination lamp panel (132), wherein a portion of the reinforcement cross extension (60) is connected to the side outer member (140).The rear vehicle body connection structure (10) according to any one of claims 1 to 3, wherein the seatbelt mounting portion (42) includes a seatbelt mounting hole (44) formed in the rear lateral extension (40), and wherein a retractor (152) of a seatbelt (150) is provided inside the seatbelt mounting hole (44).The rear vehicle body connection structure (10) according to any one of claims 1 to 4, further comprising: a rear bulkhead piece (80) mounted on an inner side of the rear cross extension (40) opposite to the reinforcing cross extension (60).The rear vehicle body connecting structure (10) according to any one of claims 1 to 5, wherein the rear cross extension (40) includes: a front cross portion (48) connected to the floor panel (130); and an upper curve (50) formed to be bent from the front cross portion (48) and to be curved to connect the pillar member (20) and the cross member (30).The rear vehicle body connecting structure (10) according to claim 6, wherein the rear bulkhead piece (80) includes: a front cross flange (82) connected to the front cross portion (48); and an upper cross flange (84) connected to the upper curve (50).The rear vehicle body connecting structure (10) of claim 7, wherein the upper cross flange (84) includes: a first cross flange (86) connected to a lower portion of the upper curve (50); and a second cross flange (88) spaced apart from the first cross flange (86) and connected to an upper portion of the upper curve (50).The rear vehicle body connecting structure (10) according to any one of claims 5 to 8, further comprising: a rear panel (160) disposed behind the cross member (30), wherein the rear cross wall piece (80) further comprises a rear cross flange (90) connected to the rear panel (160).The rear vehicle body connection structure (10) according to any one of claims 7 to 9, further comprising: a rear floor reinforcement (162) connected to the floor panel (130) and coupled to the front cross flange (82) of the rear cross panel (80).The rear vehicle body connection structure (10) according to any one of claims 4 to 10, further comprising: a rear lower side bulkhead piece (100) mounted to a lower portion of the seatbelt mounting hole (44) inside the rear cross extension (40).The rear vehicle body connection structure (10) according to claim 11, wherein the rear lower side bulkhead piece (100) connects the reinforcement bulkhead extension (60), the rear bulkhead extension (40), and the rear bulkhead piece (80).The rear vehicle body connecting structure (10) according to claim 11 or 12, wherein the rear lower side bulkhead piece (100) includes: a lower outer flange (102) connected to the reinforcement bulkhead extension (60), a lower front flange (104) connected to the rear bulkhead extension (40), and a lower inner flange (106) connected to the rear bulkhead piece (80).The rear vehicle body connection structure (10) according to any one of claims 4 to 13, further comprising: a mounting bracket (164) engaged with the rear cross extension (40) to mount the seatbelt (150).The rear vehicle body connection structure (10) according to any one of claims 4 to 14, further comprising: a rear upper side bulkhead piece (120) mounted to an upper portion of the seatbelt mounting hole (44) inside the rear cross extension (40).The rear vehicle body connecting structure (10) according to claim 15, wherein the rear upper side bulkhead piece (120) includes: an upper outer flange (122) connected to the reinforcement cross extension (60); an upper front flange (124) connected to the rear cross extension (40); and an upper inner flange (126) formed on an opposite side of the upper outer flange (122) and connected to the rear cross extension (40).The rear vehicle body connecting structure (10) of claim 16, wherein the pillar member (20) includes an inner lower side panel (134) connected to the rear cross extension (40), and wherein the upper front flange (124) and the upper inner flange (126) are connected to the rear cross extension (40) and the inner lower side panel (134).A rear vehicle body connecting structure (10) comprising: a rear cross extension (40) connecting a pillar member (20) and a cross member (30) at a rear of a vehicle body and having a seat belt mounting hole (44); and a plurality of reinforcing portions mounted adjacent to the seat belt mounting hole (44) and forming a mounting space (46) surrounding a retractor (152) of a seat belt (150) inserted into the seat belt mounting hole (44).The rear vehicle body connection structure (10) according to claim 18, wherein the plurality of reinforcing portions include: a reinforcing cross extension (60) mounted on a side of the rear cross extension (40) and a lower portion of which is connected to a floor panel (130); a rear cross wall piece (80) mounted on an inner side of the rear cross extension (40) opposite to the reinforcing cross extension (60); a rear lower side cross wall piece (100) mounted on a lower portion of the seat belt mounting hole (44) within the rear cross extension (40); and a rear upper side cross wall piece (120) mounted on an upper portion of the seat belt mounting hole (44) within the rear cross extension (40).

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