Frame assembly

Abstract

A frame assembly includes: a plurality of body cross members disposed at a body floor of a vehicle and extending in a width direction of the vehicle; a vehicle body lower side member disposed on a vehicle outer side in an outward direction of the vehicle body cross member, connected to the vehicle body cross member, and extending in a longitudinal direction of the vehicle; and a support member including extending ends extending in a plurality of directions from a center, each extending end connecting at least one of the plurality of body cross members to the body lower side member, where the plurality of body cross members, the body lower side member, and the support member are connected to each other to define a load path for a lateral collision of the vehicle.

Description

Technical Field

[0001] The present invention relates to a vehicle frame assembly. Background Art

[0002] Recently, a purpose-built vehicle (PBV) has been introduced as a modular device with a simple structure that can be designed according to various needs of customers at the time they need it. PBV is an environmentally friendly multi-purpose mobility vehicle that can be provided at a low cost according to the business purpose and needs of customers. As market demand increases, the necessity of producing various vehicles in small batches is also increasing.

[0003] Therefore, the PBV adopts a structure in which a multi-purpose body designed in consideration of hailing and / or delivery characteristics is coupled to the upper portion of a chassis frame to ensure passenger comfort and convenience of luggage loading. Due to the above structure, a sliding door is adopted for the PBV to further improve passenger comfort and convenience of luggage loading. For this purpose, the body lower longitudinal beam is arranged at a position lower than the floor cross beam.

[0004] In this case, since the vehicle body side member is disposed at a position lower than the floor cross member, the height difference between the floor cross member and the vehicle body side member reinforcement structure may increase, thereby causing a problem that the structure for coping with a lateral collision of the vehicle becomes weak.

[0005] Therefore, there is a need to provide a solution for achieving a load path for a lateral collision of a vehicle by reducing a height difference between a floor cross member and a vehicle body lower side member reinforcement structure.

[0006] The details described in this background section are only for the purpose of promoting the understanding of the background of the invention and should not be construed as an admission of the prior art known to a person of ordinary skill in the art. Summary of the invention

[0007] The present invention relates to a vehicle frame assembly and a specific embodiment thereof relates to a vehicle frame assembly applied with a sliding door, wherein a load path for a lateral collision of a vehicle is formed by an effective connection structure between a vehicle body cross member, a vehicle body lower longitudinal member and a supporting member to maximize the torsional rigidity and connection capacity of the vehicle.

[0008] Therefore, an embodiment of the present invention is made in view of the problems in the prior art, and an embodiment of the present invention provides a frame assembly using a sliding door, wherein a load path for a lateral collision of a vehicle is formed by an effective connection structure between a body cross member, a body lower longitudinal member and a supporting member, resulting in maximizing the torsional rigidity and connection capacity of the vehicle, and dispersing excessive loads applied to the lower frame of the vehicle to various members, thereby improving the stability of the battery during a lateral collision of the vehicle.

[0009] The embodiments of the present invention are not limited to the above-mentioned embodiments, and other embodiments of the present invention not mentioned above will be clearly understood by those skilled in the art to which the present invention pertains from the following description.

[0010] According to an embodiment of the present invention, a frame assembly is provided, comprising: a plurality of body cross beams, which are arranged at a body floor of a vehicle and extend in a width direction of the vehicle; a body lower longitudinal beam, which is arranged on the outside of the vehicle in an outward direction of the body cross beam, is connected to the body cross beam and extends in a longitudinal direction of the vehicle; and a supporting member, comprising extending ends extending from a center in a plurality of directions, each extending end connecting at least one of the plurality of body cross beams to the body lower longitudinal beam, wherein the plurality of body cross beams, the body lower longitudinal beam and the supporting member are connected to each other to form a load path for a lateral collision of the vehicle.

[0011] Each of the plurality of vehicle body cross members may be connected to an inner surface of the vehicle body side member in a state of surface contact with the inner surface of the vehicle body side member.

[0012] The frame assembly may further include a chassis frame disposed at a lower portion of the vehicle body, the chassis frame being disposed in an inward direction of the vehicle, and the battery pack being mounted on the chassis frame.

[0013] The chassis frame may include a plurality of mounting portions extending outward, and each of the vehicle body floor and the plurality of vehicle body cross members is fastened to a corresponding one of the plurality of mounting portions using a bolt, thereby being connected to the chassis frame.

[0014] The chassis frame may be detachably coupled to the plurality of body cross members and body lower longitudinal members.

[0015] A plurality of body cross members, body side rails, and support members may all be connected to the body floor of the vehicle.

[0016] Among the extending ends of the support member, two extending ends may extend obliquely from the center of the support member and may be connected to two adjacent vehicle body cross members, and the other extending end may extend outward and may be connected to a vehicle body lower side member.

[0017] The frame assembly may further include a central side member disposed at the center of the support member and connecting at least two of the plurality of body cross members to each other in a longitudinal direction of the vehicle, and the central side member may be parallel to the body lower side member.

[0018] The frame assembly may further include an extension beam extending in the width direction of the vehicle and connecting the center side beam to the vehicle body lower rail, and a plurality of body cross members, vehicle body lower rails, extension beams and center side beams may be connected to each other to form a load path for a lateral collision of the vehicle.

[0019] The support member may include a plurality of support members spaced apart from each other in a longitudinal direction of the vehicle and positioned in the same direction as a direction in which the center side beam is positioned.

[0020] The frame assembly may also include: an upper door panel, which is arranged above the lower longitudinal beam of the vehicle body and connected to the vehicle body floor; and a lower door panel, which is arranged below the upper door panel and is joined to the upper door panel at a portion abutting the upper door panel, wherein the upper door panel and the lower door panel define an internal space therebetween, in which a door arm configured to open and close a sliding door of the vehicle is accommodated.

[0021] Each of the door upper panel and the door lower panel may be connected to the vehicle body lower side member at a first side, and may have a shape increasing in width moving toward a center from a rear portion.

[0022] The center side member may be coupled to the door lower panel to transfer a load caused by a lateral collision of the vehicle to the door lower panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of various embodiments of the present invention will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a view showing a frame assembly according to an embodiment of the present invention;

[0025] Figure 2 is a view showing a load path of a frame assembly according to an embodiment of the present invention when a vehicle lateral collision occurs;

[0026] Figure 3 is a view showing a center side member and an upper door panel according to an embodiment of the present invention;

[0027] Figure 4 is a view showing a longitudinal cross section of a vehicle region provided with an upper door panel and a lower door panel according to an embodiment of the present invention;

[0028] Figure 5 is a view showing a triangular cross-sectional structure defined by a vehicle body cross member, a supporting member, and a center side member according to an embodiment of the present invention;

[0029] Figure 6 and Figure 7 is a view showing a partition wall formed by welding a B-pillar to an upper door panel and a lower door panel according to an embodiment of the present invention; and

[0030] Figure 8 and Fig. 9 2 is a view showing an extension beam according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts.

[0032] Now, the exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings. For simplicity of description with reference to the accompanying drawings, the same or equivalent components may be represented by the same reference numerals, and their description will not be repeated.

[0033] Generally, when used in the following description, suffixes such as "module" and "unit" can be used to refer to elements or components to facilitate easy writing of the specification. Such suffixes are used herein only to facilitate the description of the specification, and the suffixes do not mean any special meaning or function.

[0034] In addition, in the following description of the embodiments disclosed herein, if it is determined that the detailed description of the known functions or structures related to the embodiments of the present invention will make the subject matter of the embodiments unclear, such detailed description is omitted. The accompanying drawings are used to help to easily understand various technical features, and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. Therefore, the embodiments of the present disclosure should be interpreted as also extending to any changes, equivalents and substitutes other than those specifically described in the accompanying drawings. It should be understood that although the terms "first", "second", etc. can be used to illustrate various elements in this article, these elements should not be interpreted as being limited by these terms. These terms are only used to distinguish one element from another element.

[0035] It should be understood that when an element is referred to as being "connected to" another element, there may be intervening elements, or the element may be directly connected to another element. Conversely, it should be understood that when an element is referred to as being "directly connected to" another element, there are no intervening elements.

[0036] Unless the context clearly indicates otherwise, a singular form may include a plural form.

[0037] The terms such as “including” or “having” used in this document should be understood to indicate the existence of various features, numbers, steps, operations, elements, parts or their combinations disclosed in the specification, but it should be understood that the existence or addition of one or more other features, numbers, steps, operations, elements, parts or their combinations are not excluded.

[0038] Hereinafter, embodiments of the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings.

[0039] An embodiment of the present invention provides a structure in which a vehicle body lower longitudinal beam, a battery cross beam, a chassis frame and a floor cross beam constitute a load path when the vehicle collides laterally.

[0040] Figure 1 2 is a view showing a frame assembly according to an embodiment of the present invention. Figure 1 The components relevant to the embodiment are mainly shown, but it is self-evident that more or fewer components may be included in the actual implementation of the frame assembly.

[0041] Reference Figure 1 The vehicle frame assembly according to the embodiment of the present invention may include a vehicle body cross member, a vehicle body lower longitudinal member 300 and a supporting member 400 .

[0042] First, the body cross beam may include a plurality of body cross beams provided at the body floor 20, arranged from the front side to the rear side of the body floor 20, and extending transversely. The body cross beam may be divided into a first body cross beam 210, a second body cross beam 220, a third body cross beam 230, a fourth body cross beam 240, and a fifth body cross beam 250 from the front side of the vehicle. Since the plurality of body cross beams are arranged to be spaced apart from each other at regular intervals, impact force caused by a lateral collision of the vehicle may be dispersed in multiple directions, thereby dispersing a load applied to the lower frame of the vehicle to various members.

[0043] The chassis frame 100 may be provided at the lower portion of the vehicle body and may be arranged at a position further inward of the vehicle body than the vehicle body lower side sill 300, and the battery pack 10 may be mounted on the chassis frame 100. The battery pack 10 of the vehicle may be located at the lowest position of the vehicle so that the center of mass of the vehicle is at the lowest level, and may be supported at the lateral side thereof by the chassis frame 100. Therefore, it is possible to reduce the load applied to the battery pack 10 at the time of a lateral collision of the vehicle.

[0044] The vehicle is provided with a plurality of mounting portions extending in an outward direction of the chassis frame 100 and fastened to the vehicle body floor 20 and the vehicle body cross member by bolts, respectively. More specifically, a first mounting portion A provided at the front side of the chassis frame 100 may be coupled to the lower end of the vehicle body floor 20, and a second mounting portion B provided at the rear side of the chassis frame 100 may be coupled to the fifth vehicle body cross member 250, thereby maximizing the torsional rigidity and connection capability of the vehicle. The chassis frame 100 may be configured to be separated from the vehicle body cross member and the vehicle body lower longitudinal member 300.

[0045] The body side member 300 may be disposed at the vehicle outer side corresponding to the body cross member, and may be connected to the body cross member and extend in the longitudinal direction of the vehicle. The body side member 300 may be connected to both ends of the body cross member at its inner surface, thereby maximizing the rigidity of the lower end of the body floor 20. As a result, since the load applied to the body side member 300 at the time of a lateral collision of the vehicle is directly transmitted to each body cross member, the load is not excessively applied and is dispersed, thereby increasing the overall frame rigidity.

[0046] In the following, reference will be made to Figure 2The supporting member 400 will be described.

[0047] Figure 2 1 is a view showing a load path of a frame assembly according to an embodiment of the present invention when a vehicle lateral collision occurs.

[0048] Reference Figure 2 The support member 400 is provided with extended ends extending from the center thereof in multiple directions to define a "Y" shape. The extended ends of the support member 400 may connect at least one vehicle body cross beam to the vehicle body lower longitudinal beam 300. Figure 2 As shown, among the extension ends, the inner extension end may extend obliquely from the center of the support member 400 and may be connected to two vehicle body cross members, while the outer extension end may extend outward and may be connected to the vehicle body lower side member 300 .

[0049] In one embodiment, the support member 400 may connect two adjacent cross beams among the five cross beams of the first cross beam 210 to the fifth cross beam 250 to the side beam 300. In addition, since the support member 400 includes a plurality of support members 400, it is possible to more effectively disperse the load caused by the lateral collision of the vehicle. Through the connection structure of the support member 400, the cross beam, the side beam 300, and the support member 400 are connected to each other to form a load path for the lateral collision of the vehicle.

[0050] Figure 3 1 is a view showing a center side member 310 and an upper door panel 31 according to an embodiment of the present invention. Figure 4 1 is a view showing a longitudinal cross section of a vehicle region where an upper door panel 31 and a lower door panel 30 according to an embodiment of the present invention are provided.

[0051] Reference Figure 3 and Figure 4 The upper door panel 31 may be disposed above the lower longitudinal beam 300 of the vehicle body and may be connected to the vehicle body floor 20. The upper door panel 31 may connect the B-pillar 40 at the front side thereof to the C-pillar 50 at the rear side thereof so as to form an effective connection structure with the vehicle frame and maximize the torsional rigidity and connection capacity of the vehicle. The lower door panel 30 may be disposed below the upper door panel 31. The lower door panel 30 may be coupled to the center side beam 310 described later so that the load caused by the lateral collision of the vehicle is transmitted to the lower door panel 30.

[0052] In particular, the center side beam 310 and the support member 400 may be sequentially arranged on the vehicle inner side in the inward direction of the lower door panel 30. Here, since the lower surface of the center side beam 310 contacts the lower end of the support member 400 and the lower door panel 30, a load path structure is formed in which the load caused by the lateral collision of the vehicle is transferred from the lower door panel 30 to the center side beam 310 and then from the center side beam 310 to the support member 400.

[0053] Furthermore, since the roller guide structure F of the door arm 32 is provided on the door lower panel 30 , the sliding door of the vehicle can be stably opened and closed.

[0054] In addition, the door lower panel 30 and the door upper panel 31 may abut against each other at the periphery in the vertical direction, and may be joined to each other in a face-to-face manner at the periphery to define an interior space. In the interior space defined between the door upper panel 31 and the door lower panel 30, a door arm 32 that enables a sliding door of the vehicle to be opened and closed may be provided below the door upper panel 31. Through the mounting structure of the door arm 32, the problem of connection capability caused by the vehicle body lower side beam 300 being provided at a lower level and applying a sliding door can be fully compensated.

[0055] Each of the door upper panel 31 and the door lower panel 30 may be connected to the vehicle body lower side member 300 at one side thereof, and may be configured to have a shape with increasing width moving from the rear portion to the center portion thereof. This is because the center portions of the door upper panel 31 and the door lower panel 30 are connected to the center side member 310. Through such a connection structure, it is possible to evenly disperse the load caused by a lateral collision of the vehicle in the inward direction of the vehicle.

[0056] Figure 5 4 is a view showing a triangular cross-sectional structure defined by a vehicle body cross member, a support member 400, and a central side member 310 according to an embodiment of the present invention. The central side member 310 may connect at least two vehicle body cross members to each other in the longitudinal direction of the vehicle at the central portion of the support member 400. In one embodiment, for example, Figure 5 As shown, the center side member 310 may be configured to connect the second cross member 220 and the fourth cross member 240 to each other below the vehicle body floor 20. The center side member 310 may also be connected to the support member 400 at one side thereof, thereby helping to increase the torsional rigidity of the vehicle.

[0057] In addition, refer to Figure 5 , it can be noted that a triangular cross-sectional structure D is defined by the support member 400, the center side beam 310, and the second to fourth body cross beams 220 to 240 in the inward direction of the vehicle. This three-point support structure enables the load applied to the lower frame of the vehicle to be dispersed to the center side beam 310 and the first to fifth body cross beams 210 to 250, with the result that the load shared by each body cross beam becomes very low, thereby improving the stability of the battery.

[0058] Here, each support member 400 may be located on the same side as the side where the central side beam 310 is located. Since the support member 400 that connects two adjacent body cross beams to each other in order to cope with a lateral collision of the vehicle includes a plurality of support members 400, the torsional rigidity of the vehicle can be further increased. In addition, the plurality of support members 400 may be arranged in the same direction while being spaced apart from each other in the longitudinal direction of the vehicle, and may be connected to the central side beam 310 at a first side thereof.

[0059] The plurality of body cross members, body side members 300, and support members 400 described above can all be connected to the body floor 20 of the vehicle. With the prevalence of PBVs in which the height of the body floor 20 is reduced, the body side members 300 are arranged at a lower level than conventional vehicles, thereby weakening the structure for dealing with a lateral collision of the vehicle and also reducing the rigidity of the body floor 20. Here, by connecting the body floor 20 with the plurality of body cross members, body side members 300, and support members 400, it is possible to disperse the excessive load applied to the underframe of the vehicle to each member, thereby increasing the rigidity of the lower end of the body floor 20.

[0060] Figure 6 and Figure 7 4 is a view showing a partition wall formed by welding a B-pillar 40 to the door upper panel 31 and the door lower panel 30 according to the embodiment of the present invention.

[0061] Reference Figure 6 and Figure 7 , shows a partition wall E formed by welding the B-pillar 40 to the door upper panel 31 and the door lower panel 30 and having a closed cross section. By the structure of the partition wall E, it is possible to prevent excessive load from being concentrated on the door upper panel 31 and the door lower panel 30, and to disperse the load caused by a lateral collision to the B-pillar 40.

[0062] Figure 8 and Fig. 9 is a view showing an extension beam 410 according to an embodiment of the present invention.

[0063] Reference Figure 8 and Fig. 9 , the extension beam 410 may extend in the width direction of the vehicle to connect the center side beam 310 to the vehicle body lower side beam 300. In a vehicle structure in which the end of the vehicle body lower side beam 300 is arranged at the lower end of the vehicle body cross beam due to the application of the sliding door, a load path for a lateral collision of the vehicle can be formed by arranging an additional extension beam 410. In this case, the vehicle body cross beam, the vehicle body lower side beam 300, the extension beam 410 and the center side beam 310 are connected to each other to form a load path for a lateral collision of the vehicle.

[0064] As is apparent from the above description, in a vehicle structure using sliding doors, since a load path for a lateral collision of the vehicle is formed through an effective connection structure between the body cross beam, the body lower longitudinal beam and the supporting member, the torsional rigidity and connection capacity of the vehicle can be maximized, and the excessive load applied to the lower frame of the vehicle can be dispersed to various members, thereby improving the stability of the battery during a lateral collision of the vehicle.

[0065] Effects obtainable by the embodiments of the present invention are not limited to the above-mentioned effects, and those skilled in the art to which the present invention pertains will clearly understand other effects of the embodiments of the present invention not mentioned above from the foregoing description.

[0066] Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will appreciate that the embodiments of the present invention may be implemented as various other embodiments without changing the technical ideas or features of the present invention.

Claims

1. A frame assembly comprising: a plurality of body cross members disposed at a body floor of the vehicle and extending in a width direction of the vehicle; a vehicle body lower longitudinal beam, which is disposed on the vehicle outer side in the outward direction of the vehicle body cross beam, is connected to the vehicle body cross beam, and extends in the longitudinal direction of the vehicle; as well as A support member includes extended ends extending from a center in a plurality of directions, each of the extended ends connecting at least one of the plurality of body cross beams to the body lower side beam, wherein the plurality of body cross beams, the body lower side beam and the support member are connected to each other to define a load path for a lateral collision of the vehicle.

2. The frame assembly according to claim 1, wherein: Each of the plurality of vehicle body cross members is connected to an inner surface of the vehicle body side sill in a state of surface contact with the inner surface of the vehicle body side sill.

3. The vehicle frame assembly according to claim 1, further comprising a chassis frame provided at a lower portion of the vehicle body, the chassis frame being provided in an inward direction of the vehicle and configured to be mounted with a battery pack.

4. The frame assembly according to claim 3, wherein: The chassis frame includes a plurality of mounting portions extending outward, and wherein each of the vehicle body floor and the plurality of vehicle body cross members is fastened to a corresponding one of the plurality of mounting portions using a bolt so as to be connected to the chassis frame.

5. The frame assembly according to claim 3, wherein: The chassis frame is detachably coupled to the plurality of vehicle body cross members and the vehicle body lower longitudinal members.

6. The frame assembly according to claim 1, wherein: The plurality of body cross members, the body side sills, and the support member are all connected to a body floor of the vehicle.

7. The frame assembly according to claim 1, wherein: Among the extended ends of the support member, two extended ends extend obliquely from the center of the support member and are connected to two adjacent vehicle body cross members, and the other extended end extends outwardly and is connected to the vehicle body lower side member.

8. A frame assembly comprising: a plurality of body cross members disposed at a body floor of the vehicle and extending in a width direction of the vehicle; a vehicle body lower longitudinal beam, which is disposed on the vehicle outer side in the outward direction of the vehicle body cross beam, is connected to the vehicle body cross beam, and extends in the longitudinal direction of the vehicle; a support member including extending ends extending from a center in a plurality of directions, each of the extending ends connecting at least one of the plurality of body cross members to the body lower side member, wherein the plurality of body cross members, the body lower side member and the support member are connected to each other to define a load path for a lateral collision of the vehicle; as well as A central side beam is provided at the center of the support member and connects at least two of the plurality of vehicle body cross beams to each other in the longitudinal direction of the vehicle, the central side beam being parallel to the vehicle body lower longitudinal beam.

9. The vehicle frame assembly according to claim 8, further comprising an extension beam extending in the width direction of the vehicle and connecting the center side beam to the vehicle body lower longitudinal beam, wherein: The plurality of body cross members, the body side members, the extension beams, and the center side members are connected to each other to define a load path for a lateral collision of the vehicle.

10. The frame assembly according to claim 8, wherein: The support member includes a plurality of support members that are spaced apart from each other in the longitudinal direction of the vehicle and positioned in the same direction as the center side beam.

11. The frame assembly according to claim 8, further comprising: A door upper panel, disposed above the vehicle body lower longitudinal beam and connected to the vehicle body floor; as well as The door lower panel is arranged below the door upper panel and is coupled to the door upper panel at a portion abutting against the door upper panel.

12. The frame assembly according to claim 11, wherein: The door upper panel and the door lower panel define an interior space therebetween, the interior space housing a door arm configured to open and close a sliding door of a vehicle.

13. The frame assembly according to claim 11, wherein: Each of the door upper panel and the door lower panel is connected to the vehicle body lower side member at a first side, and has a shape that increases in width moving toward the center from the rear.

14. The frame assembly of claim 11, wherein: The center side member is coupled to the lower door panel so that a load caused by a lateral collision of the vehicle is transmitted to the lower door panel.

15. The vehicle frame assembly according to claim 8, further comprising a chassis frame provided at a lower portion of the vehicle body, the chassis frame being provided in an inward direction of the vehicle and configured to mount a battery pack.

16. The frame assembly of claim 15, wherein: The chassis frame includes a plurality of mounting portions extending outward, and wherein each of the vehicle body floor and the plurality of vehicle body cross members is fastened to a corresponding one of the plurality of mounting portions using a bolt so as to be connected to the chassis frame.

17. The frame assembly of claim 15, wherein: The chassis frame is detachably coupled to the plurality of vehicle body cross members and the vehicle body lower longitudinal members.

18. The frame assembly of claim 8, wherein: The plurality of body cross members, the body side sills, and the support member are all connected to a body floor of the vehicle.

19. The frame assembly of claim 8, wherein: Among the extended ends of the support member, two extended ends extend obliquely from the center of the support member and are connected to two adjacent vehicle body cross members, and the other extended end extends outwardly and is connected to the vehicle body lower side member.

20. A vehicle comprising: body, including body floor; a plurality of vehicle body cross members disposed at the vehicle body floor and extending in a width direction of the vehicle; a pair of side beams, respectively disposed on both sides of the vehicle at vehicle outer sides and extending in the longitudinal direction of the vehicle, wherein each of the pair of side beams is connected to a corresponding end of the vehicle body cross member; a support member including extending ends extending from a center in a plurality of directions, each of the extending ends connecting at least one of the plurality of body cross members to one of the pair of side members, wherein the plurality of body cross members, one of the pair of side members, and the support member are connected to each other to define a load path for a lateral collision of the vehicle; a chassis frame disposed at a lower portion of the vehicle body in an inward direction of the vehicle and detachably coupled to the plurality of vehicle body cross members and the pair of lower side members; and A battery pack is mounted on the chassis frame.

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