KR102706258B1 - Rear car body structure of low floor bus - Google Patents

Abstract

The present invention introduces a rear body structure of a low-floor bus, characterized by including: a rear crossmember coupled to the rear end of a rear side frame; a rear support frame assembly having one end connected to the rear of the rear crossmember and the other end formed to be inclined downward; a rear floor having one end connected to one end of the rear support frame assembly and connected to the rear of the rear crossmember, and the other end extended rearwardly and connected to a body portion; and a drive module frame assembly having one end connected to the other end of the rear support frame assembly and the other end connected to the body portion to form a space, and in which components necessary for driving the vehicle are mounted.

Description

Rear body structure of low-floor bus {REAR CAR BODY STRUCTURE OF LOW FLOOR BUS}

The present invention relates to a rear body structure of a low-floor bus that appropriately distributes the load of a drive module frame assembly by improving the structure of a portion where a drive module frame assembly and a rear frame portion are connected.

As the development of eco-friendly buses accelerates, there are many structural inconsistencies in responding to them with traditional body frame structures.

That is, as the number of components for electrically driving a vehicle increases, the weight of the rear module located at the rear of the vehicle is similar to that of a conventional CNG engine vehicle, but a structure of a drive module frame assembly for easy placement and installation of these components is required.

In particular, since the structure in which the drive module frame assembly and the rear frame portion at the front end are connected is weak, a considerable portion of the load of the rear module portion is supported by the rear frame, resulting in a problem in which the connection rigidity is reduced, and therefore, a connection structure capable of appropriately distributing the load of the rear module portion is required.

The matters described as background technology above are only intended to enhance understanding of the background of the present invention, and should not be taken as an acknowledgment that they correspond to prior art already known to those skilled in the art.

KR 10-0764504 B1

The present invention has been made to solve the problems described above, and provides a rear body structure of a low-floor bus that appropriately distributes the load of the drive module frame assembly by improving the structure of the portion where the drive module frame assembly and the rear frame are connected.

In order to achieve the above purpose, the present invention may be characterized by including: a rear cross member coupled to the rear end of a rear side frame; a rear support frame assembly having one end connected to the rear of the rear cross member and the other end formed to be inclined downward; a rear floor having one end connected to one end of the rear support frame assembly and the rear of the rear cross member, and the other end extended rearwardly and connected to a body portion; and a drive module frame assembly having one end connected to the other end of the rear support frame assembly and the other end connected to the body portion to form a space, and in which components necessary for driving a vehicle are mounted.

It further includes a decking bracket coupled to the lower end of the drive module frame assembly and having a mounting portion protruding toward the rear cross member; and the lower end of the rear support frame assembly can be mounted and coupled to the upper surface of the mounting portion of the decking bracket.

The above rear support frame assembly may include an inclined member having an upper end coupled to a rear surface of the cross member and a lower end formed to be inclined downward toward a lower end of the drive module frame assembly; a support member having a lower end of the inclined member coupled to a front end and a rear end bottom surface coupled to a mounting portion of the decking bracket.

The above support member is formed in a tubular shape with a closed cross-section structure; the decking bracket and the support member are penetratedly connected by a bolting connection structure; and the bolting connection can be performed at multiple locations around the lower end of the inclined member.

The above rear support frame assembly may include: an inclined member having an upper end coupled to a rear surface of the cross member and a lower end formed to be inclined downward toward a lower end of the drive module frame assembly; a support member having a lower end of the inclined member coupled to a front end and a rear end bottom surface coupled to a mounting portion of the decking bracket; a vertical member having a lower end coupled to a rear end of the support member connected to the lower end of the inclined member and an upper end formed to face upward; and a connecting member having both ends connected between the upper end of the inclined member and the upper end of the vertical member to form a closed cross-sectional structure.

The above drive module frame assembly is provided with a mounting member in the transverse longitudinal direction at its front end; the support member is provided with a length corresponding to the transverse length of the mounting member and can be connected to the mounting member.

A side skirt rail can be connected to the outer end of the above support member.

On the back surface of the above-mentioned mounting member, a plurality of member members are connected in all directions to form an underfloor; on both sides of the middle portion of the above-mentioned underfloor, bulkhead reinforcing members extending in the longitudinal direction of the front and rear and in the upper and lower directions are respectively connected to form a motor mounting space in which a driving motor is mounted; and the lower end of the inclined member can be connected on a support member corresponding to a point where the bulkhead reinforcing members are connected.

A drive module mounting space can be created on both sides of the above motor mounting space.

Through the above-described problem solving means, the present invention has the effect of improving the connection rigidity between the rear frame and the drive module frame assembly by connecting the rear cross member and the drive module frame assembly by the rear support frame assembly, thereby forming a closed cross-section structure based on the side by connecting the rear floor and the drive module frame assembly through the body portion.

Furthermore, since the load transmitted from the drive module frame assembly is transmitted along the entire transverse length of the support member and through the inclined member, the support area is expanded, thereby providing the effect of supporting the load of the drive module frame assembly more stably.

Figure 1 is a perspective view showing the rear frame portion and the drive module frame assembly according to the present invention separated.
Figure 2 is an enlarged drawing showing the structure of the decking bracket from a side view of Figure 1.
FIG. 3 is a drawing showing a structure in which the cross member and drive module frame assembly of the present invention are connected by a rear support module.
Figure 4 is a drawing showing a shape of a rear frame portion and a drive module frame assembly combined according to the present invention when viewed from a plane.
Fig. 5 is a cross-sectional structure taken along line A-A of Fig. 4, showing a joint structure by a rear support module.
Figure 6 is a drawing exemplifying a state in which a closed cross-section structure is formed by the rear support module and the body in Figure 5.
Figure 7 is a cross-sectional structure taken along line B-B of Figure 4, showing a structure that divides a space where a driving motor is mounted and a PE room where PE driving components are installed.
Fig. 8 is a drawing showing a cross-sectional structure taken along the line C-C of Fig. 4, exemplifying one PE room where PE drive components are mounted.
FIG. 9 is a drawing of a cross-sectional structure taken along line D-D of FIG. 4, to explain the action of transmitting the load of the drive module frame assembly to the cross member through the rear support module.
Fig. 10 is a drawing showing an example of a state in which driving parts are mounted in the structure of Fig. 4.

A preferred embodiment of the present invention is described in detail with reference to the attached drawings as follows.

The present invention is characterized by a rear body structure of a low-floor bus, and is configured to include a rear cross member (200) coupled to the rear end of a rear side frame (100), a rear support frame assembly (500) having one end connected to the rear of the rear cross member (200) and the other end formed to be inclined downward, a rear floor (600) having one end connected to one end of the rear support frame assembly (500) and the other end connected to the rear of the rear cross member (200) and the other end extended rearwardly and connected to a body portion, and a drive module frame assembly (300) having one end connected to the other end of the rear support frame assembly (500) and the other end connected to the body portion to form a space, and in which components necessary for driving the vehicle are mounted.

Specifically, referring to FIGS. 1 to 3 and FIG. 6, a rear side frame (100) is provided on each side of the rear of the low-floor bus along the longitudinal direction. For reference, the rear side frame (100) is provided with a rear suspension, and a rear axle equipped with a rear wheel can be supported by the rear suspension.

In addition, a rear cross member (200) formed long in the left and right transverse directions is provided at the rear end of the rear side frame (100), so that the rear end of the rear side frame (100) can be connected to the front of the rear cross member (200).

In addition, the low-floor bus applied to the present invention is an eco-friendly bus that uses electricity as a driving source, and the components mounted on the drive module frame assembly (300) may be PE components necessary for driving the electric bus. Preferably, there may be a drive motor, a water heater, an air surge tank, an APU, a sepcooler, a power steering (P/S) pump, a cooling pump, etc. as shown in FIG. 10.

In particular, the present invention improves the connection rigidity between the rear side frame (100) and the drive module frame assembly (300) by connecting the rear cross member (200) and the drive module frame assembly (300) by the rear support frame assembly (500) as shown in FIG. 6, and connecting the rear floor (600) and the drive module frame assembly (300) through a body part, such as a compartment body and a side pillar, to form a closed cross-section structure based on the side.

That is, since the rear frame part and the drive module frame assembly previously consisted of only a simple connection structure between the frames, the load of the drive module frame assembly was entirely transferred to the rear frame part, which caused a problem in that the connection structure between the rear frame part and the drive module frame assembly became weak.

Accordingly, in the present invention, the rear cross member (200) mounted on the rear side frame (100) and the drive module frame assembly (300) are connected by the rear floor (600) and the body together with the rear support frame assembly (500), so that the connection structure between the rear side frame (100) and the drive module frame assembly (300) is strengthened, and the load of the drive module frame assembly (300) is distributed to each connecting portion, thereby improving the rigidity of these connecting portions.

In addition, the present invention has a structure in which a bracket is connected and joined between the drive module frame assembly (300) and the rear cross member (200).

Referring to FIGS. 2 and 3, a decking bracket (400) is coupled to the lower end of the drive module frame assembly (300), and a mounting portion (410) is formed to protrude toward the rear cross member (200) at an end of the decking bracket (400).

The decking bracket (400) can be configured by combining a lower bracket (400a) and an upper bracket (400b), with one end of the lower bracket (400a) being joined to the lower bottom surface of the rear support frame assembly (500), and the other end protruding forward as the middle of the lower bracket (400a) is bent.

And, one end of the upper bracket (400b) is joined to the lower front surface of the rear support frame assembly (500), and the other end of the upper bracket (400b) is formed to protrude so as to overlap with the protruding portion of the lower bracket (400a) while the middle end of the upper bracket (400b) is bent, thereby forming a mounting portion (410).

Accordingly, the lower part of the rear support frame assembly (500) is structured to be seated and joined to the upper surface of the seating portion (410) of the decking bracket (400).

Meanwhile, as one embodiment of the rear support frame assembly (500) according to the present invention, it may be configured as a straight support structure by an inclined member (520).

Referring to FIG. 5, an inclined member (520) is formed in a square tubular shape with a closed cross-section structure, an upper end of the inclined member (520) is coupled to the back surface of the cross member, and a lower end of the inclined member (520) is formed to be inclined downward toward the lower end of the drive module frame assembly (300).

And, the lower end of the inclined member (520) is fixed to the front end of the support member (510), and the rear bottom surface of the support member (510) is coupled to the fixing portion (410) of the decking bracket (400). At this time, the support member (510) is also formed in a square tube shape with a closed cross-section structure and is formed long in the transverse direction.

That is, since the support member (510) and the inclined member (520) are connected in a tubular shape and the inclined member (520) is connected in a tubular shape to the rear cross member (200), the connection strength of the corresponding connection portion is increased, thereby stably supporting the load of the drive module frame assembly (300).

Continuing, referring to FIG. 5, the joint structure of the rear support frame assembly (500) and the decking bracket (400) will be described. The support member (510) is formed in a tubular shape with a closed cross-section, and with the support member (510) secured to the upper surface of the mounting portion (410) of the decking bracket (400), the decking bracket (400) and the support member (510) are vertically connected by a bolting joint structure using a decking bolt (420).

At this time, the bolting connection can be made at multiple locations around the lower end of the inclined member (520), and preferably, the lower end of the inclined member (520) can be bolted at the side and rear positions based on the upper surface of the support member (510) to which it is connected.

In addition, the support member (510) may be formed to be long in the transverse direction, and the inclined member (520) may be connected to a plurality of locations along the longitudinal direction of the support member (510), and the bolting connection locations may be symmetrically connected to both sides of the support member (510).

For example, when inclined members (520) are connected to the left and right sides of the support member (510), a decking bolt (420) may be bolted to the left side and rear of the lower periphery of the left inclined member (520), and a decking bolt (420) may be bolted to the right side and rear of the lower periphery of the right inclined member (520).

In addition, as another embodiment of the rear support frame assembly (500) according to the present invention, it may be configured as an inverted triangle support structure by an inclined member (520), a vertical member (530), and a connecting member (540).

Referring to FIG. 3 and FIG. 7, an inclined member (520) is formed in a square tubular shape having a closed cross-section structure, an upper end of the inclined member (520) is coupled to the back surface of the cross member, and a lower end of the inclined member (520) is formed to be inclined downward toward the lower end of the drive module frame assembly (300).

And, the lower end of the inclined member (520) is fixed to the front end of the support member (510), and the rear bottom surface of the support member (510) is coupled to the fixing portion (410) of the decking bracket (400). At this time, the support member (510) is also formed in a square tube shape with a closed cross-section structure and is formed long in the transverse direction.

In addition, the lower end of the vertical member (530) is joined to the rear end of the support member (510) connected to the lower end of the inclined member (520), and the upper end of the vertical member (530) is formed vertically upward.

And, the front end of the connecting member (540) is connected to the upper end of the inclined member (520), and the rear end of the connecting member (540) is connected to the upper end of the vertical member (530), thereby forming a closed cross-section support structure in the shape of an inverted triangle with the inclined member (520) as the inclined surface.

That is, while the inclined member (520) is connected to the rear cross member (200) in a tubular shape, the inclined member (520) and the vertical member (530) are connected to the support member (510) in a tubular shape, and the connecting member (540) is connected to the inclined member (520) and the vertical member (530) in a tubular shape to form an inverted triangle closed cross-section structure, thereby further increasing the connecting strength of the connecting portion, thereby stably supporting the load of the drive module frame assembly (300) connected to the connecting portion.

For example, the inclined member (520) constituting the rear support frame assembly (500) of the above-described inverted triangle support structure can be applied particularly to a position that supports a portion of the drive module frame assembly (300) on which the drive motor is mounted, which will be described again below.

Meanwhile, referring to FIG. 9, in the present invention, the drive module frame assembly (300) is provided with a mounting member (310) in the transverse length direction at its front end, and the support member (510) is provided with a length corresponding to the transverse length of the mounting member (310), and is formed to be at least longer than or equal to the transverse length of the mounting member (310) and is structured to be connected to the mounting member (310).

That is, the above drive module frame assembly (300) is configured by assembling a number of member members and/or frame members having various lengths to each other at the rear end of the mounting member (310), and components are mounted thereon.

Accordingly, the load transmitted from the drive module frame assembly (300) is not only evenly distributed across the entire transverse length direction of the support member through the mounting member (310), but is also transmitted through the inclined member (520) constituting the I-shaped support structure and the inverted triangle support structure, thereby expanding the support area, thereby enabling the load of the drive module frame assembly (300) to be supported more stably.

In addition, a side skirt rail (700) can be connected to the outer end of the support member (510).

That is, by additionally connecting the support member (510) to the side skirt rail (700), the structural stability of the portion connecting the drive module frame assembly (300) and the rear cross member (200) can be increased.

In addition, referring to FIG. 7, FIG. 9 and FIG. 10, a plurality of member members are connected in all directions on the back surface of the mounting member (310) to form an underfloor (320).

And, a partition wall reinforcing member (330) extending in the longitudinal direction in the front and rear directions is connected to each side of the middle portion of the underfloor (320) to create a motor mounting space (340) in which a driving motor is mounted, and the lower end of the inclined member (520) is connected to a support member (510) corresponding to the point where the partition wall reinforcing member (330) is connected.

That is, among the components mounted for driving the vehicle, the drive motor in particular is a component with a relatively large load, and thus, a bulkhead reinforcing member (330) is combined on both sides of the motor mounting space (340) to support the load of the drive motor.

In particular, an inclined member (520) forming an inverted triangle-shaped closed cross-section support structure is connected to a support member (510) corresponding to the front end of the bulkhead reinforcement member (330), thereby enabling the load of the driving motor to be supported more stably.

In addition, by implementing an underfloor (320) structure in which components are mounted on the lower part of the drive module frame assembly (300), the mounting rigidity of the components is secured, while the mounting work is easily performed, thereby improving workability.

In addition, as shown in FIG. 8 and FIG. 10, a drive module mounting space (350) may be formed on both sides of the motor mounting space (340), and a water heater, an air surge tank, an APU, a septic cooler, a power steering (P/S) pump, a cooling pump, etc. may be mounted within the drive module mounting space (350).

That is, by configuring the drive module frame assembly (300) to secure the motor mounting space (340) as well as the drive module mounting space (350) in advance, components can be mounted without adding member members to the drive module frame assembly (300) for mounting the components.

Meanwhile, although the present invention has been described in detail only with respect to the above-mentioned specific examples, it is obvious to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and it is natural that such modifications and variations fall within the scope of the appended claims.

100 : Rear side frame
200 : Rear Crossmember
300: Drive module frame assembly
310 : Mounting member
320 : Underfloor
330: Bulkhead reinforcement member
340: Motor mounting space
350: Drive module mounting space
400 : Decking Bracket
400a: Lower bracket
400b: Top bracket
410 : Settlement
420 : Decking Bolt
500: Rear support frame assembly
510 : Support Member
520 : Slope Member
530 : Vertical member
540 : Connected Member
600 : Rear floor
700 : Side skirt rail

Claims (9)

Rear crossmember attached to the rear end of the rear side frame;
A rear support frame assembly in which one end is connected to the rear of the rear cross member and the other end is formed to be inclined downward;
A rear floor having one end connected to one end of the rear support frame assembly and the other end connected to the rear of the rear cross member and extending rearwardly to be connected to the body portion;
A driving module frame assembly is provided, wherein one end is connected to the other end of the rear support frame assembly, the other end is connected to the body portion to form a space, and components necessary for driving the vehicle are mounted within the space;
It further includes a decking bracket which is connected to the lower part of the above drive module frame assembly and has a mounting portion protruding toward the rear cross member;
A rear body structure of a low-floor bus, characterized in that the lower part of the rear support frame assembly is secured and connected to the upper surface of the securing portion of the decking bracket. delete In claim 1,
The above rear support frame assembly,
An inclined member whose upper part is joined to the back surface of the cross member and whose lower part is formed to be inclined downward toward the lower part of the drive module frame assembly;
A rear body structure of a low-floor bus, characterized by including a support member, the lower end of which is connected to the inclined member at the front end and the lower surface of which is connected to the mounting portion of the decking bracket at the rear end. In claim 3,
The above support member is formed in a tubular shape with a closed cross-section structure;
The above decking bracket and support member are penetrated and connected by a bolting joint structure;
A rear body structure of a low-floor bus, characterized in that the above bolting connection is formed at multiple locations around the lower portion of the above-mentioned inclined member. In claim 1,
The above rear support frame assembly,
An inclined member whose upper part is joined to the back surface of the cross member and whose lower part is formed to be inclined downward toward the lower part of the drive module frame assembly;
A support member having the lower end of the inclined member joined to the front end and the lower surface of the rear end joined to the fixing portion of the decking bracket;
A vertical member whose lower end is connected to the rear end of a support member that is connected to the lower end of the above-mentioned inclined member, and whose upper end is formed upwardly; and
A rear body structure of a low-floor bus, characterized in that it includes a connecting member whose ends are connected between the upper ends of the inclined member and the upper ends of the vertical member to form a closed cross-section structure. In claim 5,
The above drive module frame assembly is provided with a mounting member in the transverse longitudinal direction at its front end;
A rear body structure of a low-floor bus, characterized in that the support member is provided with a length corresponding to the transverse length of the mounting member and is connected to the mounting member. In claim 6,
A rear body structure of a low-floor server characterized in that a side skirt rail is connected to the outer end of the above support member. In claim 6,
A plurality of member members are connected in all directions on the back surface of the above mounting member to form an underfloor;
On both sides of the middle portion of the above underfloor, bulkhead reinforcement members extending in the longitudinal direction and up and down are respectively connected to create a motor mounting space in which a driving motor is mounted;
A rear body structure of a low-floor bus, characterized in that the lower end of the inclined member is connected to a support member corresponding to the point where the above bulkhead reinforcement member is connected. In claim 8,
A rear body structure of a low-floor bus characterized in that a drive module mounting space is created on both sides of the motor mounting space.