High roof structure of truck

Abstract

The high roof structure (1) of the truck is installed above a cab main body (10) with an open ceiling part. A high roof structure (1) is provided with a pair of front side frames (2) and a pair of rear side frames (3) that support a roof panel inclined so that the vehicle height gradually increases from the front toward the rear. The front side frame (2) is provided upright from each of a pair of side surface sections (15) disposed so as to be separated from each other in the vehicle width direction (D2) in the cab body (10). The rear frame (3) is provided so as to stand at a position rearward of the front frame (2) from each of the pair of side surface sections (15) higher than the front frame (2). At least one of the rear frames (3) is provided with a fragile portion (40) formed with a relatively lower strength than a portion adjacent to the rear frame (3) in the vehicle height direction (D3).

Description

Technical Field

[0001] The present application relates to a high roof construction suitable for a cab of a truck. Background Art

[0002] For example, in a large truck, in order to expand the cabin formed in the cab, a high roof structure is sometimes adopted in which the roof panel is arranged at a higher position than usual. Such a high roof structure is arranged above the cab body with the roof portion opened (for example, refer to Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-144967 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In a cab with a high roof structure such as the one described above, since the height difference between the cab and a rack-mounted object such as a cargo box arranged behind the cab becomes small, it is difficult to install an air deflector (air deflector) for reducing air resistance during driving. Therefore, in order to reduce driving resistance without using an air deflector, in a high roof structure, the roof panel itself is sometimes tilted so that the vehicle height gradually increases from the front to the rear.

[0008] In a high roof structure using such an inclined roof panel, when a load is input from above, the load tends to be concentrated on the rear portion where the vehicle height is relatively high. Therefore, in the high roof structure, the rear portion is greatly crushed before the front portion receives the load, and deformation may spread to the cab body. Therefore, conventional high roof structures have room for improvement in terms of ensuring strength against loads from above and suppressing deformation of the cab body.

[0009] The present application has been made in view of the above-mentioned problems, and one of its objects is to suppress deformation of a cab body against a load from above.

[0010] Means for solving problems

[0011] The present application has been made to solve at least a part of the above-mentioned problems, and can be implemented as the following aspects or application examples.

[0012] (1) The high roof structure of the truck of the present application example is installed above the main body of the cab with an open roof portion, and is provided with a roof panel inclined in a manner that the vehicle height gradually increases from the front to the rear. The high roof structure of the truck comprises: a pair of front side frames, the pair of front side frames are respectively erected from a pair of side portions arranged in the cab main body and separated from each other in the vehicle width direction and support the roof panel; a pair of rear side frames, the pair of rear side frames are respectively erected from the pair of side portions at a position rearward of the front side frames and higher than the front side frames and support the roof panel; and a fragile portion, the fragile portion is provided on at least one of the rear side frames and is formed with relatively low strength compared with adjacent portions in the vehicle height direction.

[0013] According to this application example, since the rear side frame is erected higher than the front side frame, the load input from above is first input to the rear side frame before being input to the front side frame. As a result, a compressive load in the vehicle height direction acts on the rear side frame, and a relatively low-strength fragile portion is first crushed in the vehicle height direction, thereby reducing the height difference between the front side frame and the rear side frame. Furthermore, after the rear side frame is compressed to the same height as the front side frame, the load in the downward direction is input not only to the rear side frame but also to the front side frame.

[0014] Thus, the load is dispersed not only to the rear frame but also to the front frame, so that the load can be suppressed from being concentrated on the rear frame. Therefore, after the fragile portion is crushed, a large deformation of the rear frame can be suppressed.

[0015] Thus, according to this application example, when a load is input from above, the fragile portion is first crushed, so that both the front frame and the rear frame can function as support rods to resist the load. Therefore, the strength against the load from above can be ensured. Therefore, the deformation of the cab body can be suppressed.

[0016] (2) The high roof structure of the truck according to the present application example may include a front roof frame connecting the upper end portions of the front side frames, and a rear roof frame connecting the upper end portions of the rear side frames.

[0017] According to such a configuration, the load input from above can be transmitted to each front side frame and rear side frame through the front roof frame and the rear roof frame. In addition, since the front roof frame and the rear roof frame function as support rods, the front side frame and the rear side frame can be suppressed from falling inwardly in the vehicle width direction.

[0018] Thus, when a load is input from above, the load can be more reliably dispersed to the front frame and the rear frame. Therefore, the load from above can be more reliably counteracted by the front frame and the rear frame. Thus, deformation of the cab body can be further suppressed.

[0019] (3) The high roof structure of the truck of this application example may include a long roof frame that extends obliquely along the roof panel from a front portion of the cab body that is arranged forward of the pair of side portions and is connected to the front roof frame and the rear roof frame.

[0020] According to such a configuration, the load input from above can be transmitted from the long roof frame to the front side frame and the rear side frame through the front roof frame and the rear roof frame, respectively. In addition, since the front roof frame and the rear roof frame are reinforced by the long roof frame, it is possible to more reliably suppress the front side frame and the rear side frame from falling inward in the vehicle width direction.

[0021] Thus, when a load is input from above, the load can be more reliably dispersed to each of the front frame and the rear frame. Therefore, the load from above can be more reliably counteracted by each of the front frame and the rear frame. Thus, deformation of the cab body can be further suppressed.

[0022] (4) In the high roof structure of the truck according to the present application example, the dimension of the fragile portion in the vehicle height direction may be set to be equal to the difference in height between the front side frame and the rear side frame.

[0023] According to such a configuration, when a load is input from above, the rear frame after the fragile portion is crushed can be made to be at the same height as the front frame. Thus, the load is more reliably dispersed to both the front frame and the rear frame, and thus the concentration of the load on the rear frame can be more reliably suppressed. Thus, the deformation of the cab body can be further suppressed.

[0024] (5) In the high roof structure of the truck of this application example, the rear side frame may have an inner frame and an outer frame arranged on the outer side of the inner frame in the vehicle width direction and forming a closed cross-section with the inner frame, and the fragile portion may include a missing portion formed by the inner frame being divided and broken.

[0025] According to such a configuration, in the rear side frame, the fragile portion can be reliably formed with a lower strength than the portion forming the closed cross section. Therefore, when a load is input from above, the fragile portion of the rear side frame can be more reliably crushed. As a result, the load is more reliably dispersed to both the front side frame and the rear side frame, so that deformation of the cab body can be further suppressed.

[0026] (6) In the high roof structure of the truck of the present application example, the fragile portion may include two recessed portions extending in the vehicle length direction and provided apart from each other in the vehicle height direction in the rear side frame.

[0027] According to such a configuration, when a load is input from above, the fragile portion is buckled at the recessed portion. As a result, the portion between the recessed portions in the rear side frame is easily deformed, so the fragile portion can be more reliably crushed in the vehicle height direction. As a result, the load is more reliably dispersed to both the front side frame and the rear side frame, so deformation of the cab body can be further suppressed.

[0028] (7) The high roof structure of the truck according to the present application example may include an upper frame that connects the rear side frames to each other at a position rearward of the rear side frames and above the fragile portion.

[0029] According to such a configuration, when a load is input from above, the rear side frame can be restrained from falling inward in the vehicle width direction without hindering the crushing deformation of the fragile portion. In addition, according to the upper frame, when a load is input from above, the crushing speeds of the rear side frames in the vehicle height direction can be made equal to each other.

[0030] Therefore, the load distributed to the pair of rear side frames can be equalized. As a result, not only the load deviation caused by the difference in height between the front side frame and the rear side frame (which can be called the front-to-back difference) can be suppressed, but also the load deviation caused by the difference in crushing speed of the pair of rear side frames (which can be called the left-right difference) can be suppressed. Therefore, the load can be more appropriately distributed to each of the front side frame and the rear side frame. Therefore, the deformation of the cab body can be further suppressed.

[0031] (8) The high roof structure of the truck according to the present application example may include a lower frame that connects the rear side frames to each other at a position rearward of the rear side frames and below the fragile portion.

[0032] According to such a configuration, when a load is input from above, the rear side frame can be reinforced in a manner that prevents the fragile portion from being crushed and deformed. Therefore, the fragile portion of the rear side frame can be crushed more reliably and a large deformation of the rear side frame can be suppressed after the fragile portion is crushed. As a result, the load is more reliably distributed to both the front side frame and the rear side frame, so deformation of the cab body can be further suppressed.

[0033] (9) In the high roof structure of the truck of this application example, the fragile portion may be provided only on one side of the rear side frame, and the rear side frame on the other side where the fragile portion is not provided may have a bent portion bent inward in the vehicle width direction in order to configure the air intake passage.

[0034] Compared with a case without a bent portion, a rear side frame having a bent portion is more likely to fall inward in the vehicle width direction when a load is input from above, and is more likely to be crushed in the vehicle height direction. Therefore, if neither of the rear side frames is provided with a weak portion, a difference in crushing speed is likely to occur in the pair of rear side frames.

[0035] On the other hand, if the weak portion is provided on only one of the rear side frames, the weak portion of one rear side frame is crushed in the vehicle height direction when a load is input from above. Thus, the rear side frame is compressed in the vehicle height direction, so even if the other rear side frame provided with the bent portion falls inward in the vehicle width direction, the difference in crushing speed between the pair of rear side frames can be reduced.

[0036] Therefore, even when the other rear side frame is provided with a bent portion, the load distributed to the pair of rear side frames can be equalized. Therefore, not only the load deviation caused by the height difference between the front side frame and the rear side frame can be suppressed, but also the load deviation caused by the difference in the crushing speed of the pair of rear side frames can be suppressed. Therefore, the deformation of the cab body can be further suppressed.

[0037] Effects of the Invention

[0038] According to the present application, deformation of the cab body can be suppressed against a load from above. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a perspective view of the front portion of a truck to which the high roof structure according to the first embodiment is applied.

[0040] Figure 2 The roof panel is omitted. Figure 1 A three-dimensional view of the high roof structure.

[0041] Figure 3 yes Figure 2 Rear view of the high roof structure.

[0042] Figure 4 yes Figure 2 An exploded perspective view of the rear side frame of the high roof structure.

[0043] Figure 5 It is shown Figure 4 A sectional view of a closed cross-section structure of the rear side frame ( Figure 4 XX-direction cross-sectional view).

[0044] Figure 6 Yes Figure 2 A right side view of the high roof structure is shown together with the upper part of the cab body.

[0045] Figure 7 Yes Description Figure 2 Schematic right side view of the high roof structure Figure 6 corresponding figure).

[0046] Figure 8 is a perspective view of the front part of a truck to which the high roof structure of the second embodiment is applied (with Figure 1 corresponding figure).

[0047] Fig. 9 The roof panel is omitted. Figure 8 A perspective view of the high roof structure (with Figure 2 corresponding figure).

[0048] Fig.10 yes Fig. 9 Rear view of the high roof structure (with Figure 3 corresponding figure). DETAILED DESCRIPTION

[0049] The embodiments of the present application are described with reference to the accompanying drawings. The following embodiments are always merely illustrative and are not intended to exclude various modifications and technical applications not explicitly shown in the embodiments. Each of the following embodiments can be implemented in various modifications within the scope of their main purpose. In addition, selection can be made as needed, or appropriate combinations can be made.

[0050] [1. First embodiment]

[0051] [1-1. Structure]

[0052] like Figure 1 As shown, the high roof structure 1 of the truck of the first embodiment (hereinafter, also simply referred to as the "high roof structure 1") is applicable to the cab 12 of the truck 11. The truck 11 is, for example, a large flat-head truck, and an engine (not shown) is mounted below the cab 12. A rack-mounted object 13 such as a cargo box is mounted behind the cab 12. In the accompanying drawings, the front (forward direction) of the truck 11 is set as "FR", the top of the truck 11 is set as "UP", and the right side of the truck 11 is set as "RH".

[0053] In the high roof structure 1, in order to expand the vehicle compartment formed in the cab 12, the roof panel 20 forming the upper surface of the cab 12 is set at a position higher than the usual roof structure. The cab 12 using such a high roof structure 1 is also called a "high roof cab", and the truck 11 using the high roof structure 1 is also called a "high roof vehicle". In the high roof cab and the high roof vehicle, the vehicle compartment is expanded upward by using the high roof structure 1, so the livability of the vehicle compartment is improved. As a result, the comfort of the driver, passengers, etc. when resting (for example, taking a nap) in the vehicle compartment during long-distance travel is improved.

[0054] In the high roof structure 1, a roof panel 20 is installed above the cab main body 10 with an open ceiling, for example, by spot welding. The cab main body 10 is roughly box-shaped with a cover omitted, and divides the vehicle compartment together with the high roof structure 1. Specifically, the cab main body 10 has a pair of side parts 15 arranged separately from each other in the vehicle width direction (left-right direction) D2, a front part 16 arranged in front of the side parts 15, a rear part (omitted from the figure) arranged in the rear of the side parts 15, and a bottom part (omitted from the figure) connected to the lower ends of these parts. The side parts 15, the front part 16 and the rear part are all erected in the vehicle height direction (up-down direction) D3 to form the wall part of the vehicle compartment. On the other hand, the bottom part is extended in the vehicle length direction (front-back direction) D1 and the vehicle width direction D2 to form the floor surface of the vehicle compartment.

[0055] The roof panel 20 is smoothly inclined so that the vehicle height gradually increases from the front to the rear in order to reduce the air resistance when the truck 11 is traveling. In the high roof structure 1, the air resistance is reduced by setting the roof panel 20 itself in such an inclined shape instead of providing an air deflector.

[0056] In this embodiment, a roof panel 20 having a bilaterally symmetrical shape is exemplified. Specifically, the roof panel 20 includes a center panel 21 constituting the front and top of the roof panel 20, and a pair of side panels 22 respectively arranged on the left and right of the center panel 21. The center panel 21 and the side panels 22 are integrated by welding, for example. However, the specific structure of the roof panel 20 is not limited to the above example.

[0057] The high roof structure 1 of this embodiment includes Figure 2 The various frames 2 to 9 shown as examples serve as frames (frame frames) for supporting the roof panel 20. These frames 2 to 9 are arranged on the inner side of the roof panel 20 (below the center panel 21 and in the space between the side panels 22). Therefore, the frames 2 to 9 are all covered by the roof panel 20 and are not exposed from the appearance of the truck 11 and the cab 12.

[0058] Specifically, the frames 2 to 9 are a front side frame 2 and a rear side frame 3 as longitudinal frames extending in the vehicle height direction D3, a front roof frame 4, a rear roof frame 5, an upper frame 7, and a lower frame 8 as transverse frames extending in the horizontal direction (vehicle length direction D1, vehicle width direction D2), and a long roof frame 6 and an auxiliary roof frame 9 extending obliquely along the roof panel 20. In addition, the front roof frame 4, the rear roof frame 5, the long roof frame 6, and the auxiliary roof frame 9 supporting the center panel 21 of the roof panel 20 may be formed integrally (or partially integrally) as one central frame.

[0059] The front side frame 2 and the rear side frame 3 are each provided in pairs, and constitute four legs supporting the roof panel 20. Specifically, the front side frame 2 constitutes the front leg, and the rear side frame 3 constitutes the rear leg. In the high roof structure 1, the four front side frames 2 and the rear side frames 3 mainly resist the load F input from above.

[0060] The pair of front side frames 2 are respectively erected from the pair of side portions 15 of the cab body 10 and arranged along the side panels 22. In the present embodiment, the front side frames 2 are exemplified as extending upward from the side portions 15 and then smoothly curving inward in the vehicle width direction D2.

[0061] On the other hand, a pair of rear side frames 3 are respectively erected from a pair of side portions 15 of the cab body 10 at a position rearward of the front side frame 2, and are arranged along a pair of side panels 22. The rear side frames 3 are erected higher than the front side frames 2. That is, the upper end of the rear side frame 3 is located above the upper end of the front side frame 2. The entirety of the rear side frame 3 of the present embodiment is erected substantially straight upward from the side portion 15.

[0062] In the present embodiment, the pair of front side frames 2 are in mutually equal shapes (mirror-symmetrical with respect to the center in the vehicle width direction D2) corresponding to the roof panel 20 in a bilaterally symmetrical shape, and the pair of rear side frames 3 are also in mutually equal shapes. However, the pair of rear side frames 3 may also be in mutually different shapes. In the present embodiment, each of the rear side frames 3 is provided with a fragile portion 40 formed with relatively lower strength than the adjacent portion in the vehicle height direction D3. The specific structure of the rear side frame 3 and the fragile portion 40 will be described later.

[0063] The lower ends of the front side frame 2 and the rear side frame 3 are connected to the part of the side portion 15 of the cab body 10 that is reinforced by the reinforcement frame 14. The reinforcement frame 14 is a frame that reinforces a part of the side portion 15, for example, it is provided in the space between the outer panel (the outer surface in the vehicle width direction D2) of the side portion 15 and the inner panel (the inner surface in the vehicle width direction D2) of the side portion 15. In the present embodiment, an example is shown in which two reinforcement frames 14 are arranged separately from each other in the vehicle length direction D1 in each side portion 15.

[0064] The front roof frame 4 connects the upper ends of the front side frames 2. The front roof frame 4 functions as a support rod between the front side frames 2, thereby preventing the front side frames 2 from falling inward in the vehicle width direction D2. Similarly, the rear roof frame 5 connects the upper ends of the rear side frames 3. The rear roof frame 5 functions as a support rod between the rear side frames 3, thereby preventing the rear side frames 3 from falling inward in the vehicle width direction D2.

[0065] The front roof frame 4 and the rear roof frame 5 of the present embodiment both extend substantially straight along the vehicle width direction D2. As the upper end of the rear side frame 3 is located rearward and upward of the upper end of the front side frame 2 as described above, the rear roof frame 5 is arranged rearward and upward of the front roof frame 4.

[0066] The long roof frame 6 extends obliquely from the front face 16 of the cab body 10 toward the rear along the roof panel 20, and is connected to both the front roof frame 4 and the rear roof frame 5. In this way, the long roof frame 6 extends from the front face 16 of the cab body 10 through the front roof frame 4 to at least the rear roof frame 5. The long roof frame 6 of this embodiment has an extension portion 6a extending backward and downward from the rear roof frame 5. The extension portion 6a is connected to the upper frame 7.

[0067] In the present embodiment, a high roof structure 1 is exemplified in which a pair of long roof frames 6 are arranged to be separated from each other in the vehicle width direction D2 and one auxiliary roof frame 9 is arranged between the pair of long roof frames 6. However, the number of long roof frames 6 and auxiliary roof frames 9 included in the high roof structure 1 is not particularly limited. The long roof frame 6 and the auxiliary roof frame 9 may be omitted from the high roof structure 1.

[0068] The auxiliary roof frame 9 is shorter than the long roof frame 6, and extends obliquely along the roof panel 20 like the long roof frame 6, and is arranged in parallel with the long roof frame 6. The auxiliary roof frame 9 of this embodiment extends substantially straight from the front roof frame 4 to the rear roof frame 5, and connects the front roof frame 4 and the rear roof frame 5 to each other. In addition, the auxiliary roof frame 9 is not provided with an extension portion extending rearward or downward from the rear roof frame 5.

[0069] like Figure 2 , 3 As shown, the upper frame 7 connects the rear side frames 3 to each other at a position rearward of the rear side frames 3 and above the fragile portion 40. The upper frame 7 functions as a support rod between the rear side frames 3, thereby preventing the rear side frames 3 from falling inward in the vehicle width direction D2. In addition, when a load F is input from above to the high roof structure 1, the upper frame 7 has a function of making the crushing speeds of the rear side frames 3 in the vehicle height direction D3 equal.

[0070] Specifically, the upper frame 7 has two upper arms 7a connected to the inner side of the rear side frame 3 in the vehicle width direction D2, and an upper connection portion 7b connecting the upper arms 7a to each other at a position behind the rear side frame 3, and is in a U-shape with the two upper arms 7a facing forward when viewed from the vehicle height direction D3. The two upper arms 7a of the upper frame 7 are connected to the pair of rear side frames 3 at a position above the fragile portion 40. In addition, the extension portion 6a of the long roof frame 6 is connected to the upper connection portion 7b of the upper frame 7.

[0071] The lower frame 8 connects the rear side frames 3 to each other at a position rearward of the rear side frames 3 and below the fragile portion 40. Thus, the lower frame 8 is similar to the upper frame 7 in that it connects the rear side frames 3 to each other at a position rearward of the rear side frames 3, but is different from the upper frame 7 in that it is arranged below the fragile portion 40. The lower frame 8 arranged below the upper frame 7 has a function of reinforcing the base of the high roof structure 1.

[0072] The lower frame 8 of this embodiment extends forward from the rear frame 3 and is connected not only to the rear frame 3 but also to the front frame 2. Therefore, the lower frame 8 connects the pair of front frames 2 and the pair of rear frames 3 constituting four legs of the high roof structure 1.

[0073] Specifically, the lower frame 8 has two lower arms 8a extending in the vehicle length direction D1 and connected to the inner sides of the front side frame 2 and the rear side frame 3 in the vehicle width direction D2, and a lower connecting portion 8b connecting the lower arms 8a to each other at a position behind the rear side frame 3, and is in a U-shape with the two lower arms 8a facing forward when viewed from the vehicle height direction D3. The two lower arms 8a of the lower frame 8 are connected to the pair of rear side frames 3 respectively at a position below the fragile portion 40. On the other hand, no other frame is connected to the lower connecting portion 8b of the lower frame 8. In addition, the lower arm 8a may be connected to the front end of the long roof frame 6 located at the front FR position.

[0074] like Figure 3 As shown, in this embodiment, in the area 50 ( Figure 3 There is no frame configured in the area (indicated by the dotted mark in the middle). That is, there is no structure to resist the load input from above between the upper connecting portion 7b of the upper frame 7 and the lower connecting portion 8b of the lower frame 8. Therefore, when the load F is input from above, the crushing deformation of the fragile portion 40 located between the upper frame 7 and the lower frame 8 in the vehicle height direction D3 will not be hindered by other frames. Therefore, the above-mentioned area 50 can also be said to be an area (crumple zone) that does not hinder the crushing deformation of the fragile portion 40.

[0075] like Figure 4As shown, the rear side frame 3 of this embodiment includes an inner frame 31 which is divided into two parts, and an outer frame 32 which is arranged outside the inner frame 31 in the vehicle width direction D2 and forms a closed cross section with the inner frame 31. The inner frame 31 and the outer frame 32 are connected to each other by welding, for example. Figure 4 In FIG. 1 , only the rear side frame 3 disposed on the right side of the pair of rear side frames 3 is illustrated.

[0076] Specifically, the inner frame 31 is divided into an upper member 33 and a lower member 34 which are arranged at a distance from each other in the vehicle height direction D3. The upper member 33 and the lower member 34 are both hat-shaped in cross section, and are arranged in a posture that two flanges 35 extending from a web portion 36 face the outer frame 32 (outside of the vehicle width direction D2). In this embodiment, the lower member 34 in which the web portion 36 and the flange portion 35 extend straight along the vehicle height direction D3, and the upper member 33 which is arranged above the lower member 34 and extends in a curved manner so that the web portion 36 and the flange portion 35 are smoothly connected to the rear roof frame 5 are exemplified.

[0077] On the other hand, the outer frame 32 of the present embodiment has a hat-shaped cross section that is slightly larger than the inner frame 31, and is arranged with two flanges 38 extending from the web portion 37 facing the inner frame 31 (inward in the vehicle width direction D2). Figure 5 As shown, the web portion 37 of the outer frame 32 is joined to the flange portion 35 of the inner frame 31 (upper member 33 and lower member 34). When the inner frame 31 and the outer frame 32 are joined to each other, the web portion 36 of the inner frame 31 and the flange portion 38 of the outer frame 32 are arranged in the same plane.

[0078] In the rear side frame 3, a closed cross section is formed by the web portion 37 of the inner frame 31 and the outer frame 32, and a hollow portion surrounded by the closed cross section extends in the vehicle height direction D3. In this way, by accommodating the inner frame 31 having a relatively small hat-shaped cross section in the outer frame 32 having a relatively large hat-shaped cross section to form the rear side frame 3 having a closed cross section, compactness can be achieved and rigidity can be improved.

[0079] In the web portion 37 of the outer frame 32 of the present embodiment, a reinforcing rib 39 is formed in a straight line extending in the vehicle height direction D3. The rib 39 is, for example, a concave portion that is recessed toward the inner side (the inner frame 31 side) in the vehicle width direction D2. The rib 39 extending in the vehicle height direction D3 in this way has a function of increasing the rigidity against the compressive load in the vehicle height direction D3.

[0080] like Figure 4As shown, the fragile portion 40 is a portion formed with relatively low strength compared to the adjacent portion in the vehicle height direction D3 as described above. Therefore, when a compressive load in the vehicle height direction D3 acts on the rear side frame 3, the fragile portion 40 becomes a relatively easy-to-crush area (buffer zone, Crushable Zone). The fragile portion 40 is provided on at least one of the pair of rear side frames 3. In this embodiment, the pair of rear side frames 3 are formed equally as described above, and the fragile portion 40 is provided on each of the rear side frames 3.

[0081] The fragile portion 40 of this embodiment includes a missing portion 41 formed by dividing the inner frame 31, and two recessed portions 42 extending in the vehicle length direction D1 in the rear side frame 3. The two recessed portions 42 are provided to be separated from each other in the vehicle height direction D3. In this embodiment, the recessed portion 42 is provided in the portion of the outer frame 32 corresponding to the missing portion 41.

[0082] The missing portion 41 is formed by providing a gap between the upper member 33 and the lower member 34 as described above. In the rear side frame 3, although a closed cross section is formed by the inner frame 31 and the outer frame 32, no closed cross section is formed at the missing portion 41 provided between the upper member 33 and the lower member 34, and the strength is suppressed. Therefore, the missing portion 41 is formed with lower strength than either the upper portion of the closed cross section formed by the upper member 33 or the lower portion of the closed cross section formed by the lower member 34. Therefore, when a compressive load in the vehicle height direction D3 acts on the rear side frame 3, the missing portion 41 is relatively easy to be crushed.

[0083] Two recesses 42 are formed in the outer frame 32 in a straight line extending in the vehicle length direction D1 along the lower edge of the upper member 33 and the upper edge of the lower member 34, respectively. The recess 42 is, for example, recessed toward the inner side in the vehicle width direction D2, and has the same structure as the rib 39 described above. However, compared with the rib 39 extending in the vehicle height direction D3, the recess 42 extending in the vehicle length direction D1 becomes the base point (bending point) of bending when a compressive load in the vehicle height direction D3 is applied. That is, the recess 42 has a lower strength against the compressive load in the vehicle height direction D3 than the adjacent portion in the vehicle height direction D3. Therefore, when a compressive load in the vehicle height direction D3 is applied to the rear side frame 3, the fragile portion 40 including the recess 42 is bent along the recess 42, and the portion between the two recesses 42 is deformed in a manner of being crushed in the vehicle height direction D3.

[0084] like Figure 6As shown, the dimension H1 (hereinafter, also referred to as the height dimension H1) of the fragile portion 40 in the vehicle height direction D3 is set to be equal to the height difference H2 between the front side frame 2 and the rear side frame 3. In other words, the height dimension H1 of the fragile portion 40 is set so that the upper end of the front side frame 2 and the upper end of the rear side frame 3 are arranged at substantially the same height (position in the vehicle height direction D3) when the entire fragile portion 40 is crushed in the vehicle height direction D3. However, the height dimension H1 of the fragile portion 40 may not be strictly consistent with the height difference H2 between the front side frame 2 and the rear side frame 3, and may be set to allow for a slight error.

[0085] Although not shown in detail, the front side frame 2 may be a structure that forms a closed cross section similar to the rear side frame 3. In addition, a reinforcing rib similar to the rib 39 described above may be formed in a linear shape extending in the vehicle height direction D3 on the front side frame 2. However, the fragile portion 40 is not provided on the front side frame 2. Therefore, in the front side frame 2, strength can be ensured over the entire region in the vehicle height direction D3.

[0086] [1-2. Action and effect]

[0087] (1) In the high roof structure 1 provided with the roof panel 20 inclined so that the vehicle height gradually increases from the front toward the rear as described above, the rear side frame 3 is erected higher than the front side frame 2. Therefore, the load F input from above to the high roof structure 1 is first input to the rear side frame 3 before being input to the front side frame 2.

[0088] For example, in a regulatory test, it is assumed that a downward load F is input to the high roof structure 1 from a horizontal plane H (a plane extending in the vehicle length direction D1 and the vehicle width direction D2) located above the truck 11. In this case, due to the input of the load F from the horizontal plane H, a compressive load in the vehicle height direction D3 acts on the rear side frame 3. At this time, the fragile portion 40 formed with a relatively low strength in the rear side frame 3 is first crushed in the vehicle height direction D3.

[0089] like Figure 7 As shown, when the fragile portion 40 is crushed in the vehicle height direction D3, the rear side frame 3 is compressed in the vehicle height direction D3, so that the height difference H2 between the front side frame 2 and the rear side frame 3 is reduced. Furthermore, after the rear side frame 3 is compressed to the same height as the front side frame 2, a downward load F is input from the horizontal plane H not only to the rear side frame 3 but also to the front side frame 2.

[0090] Thus, the load F is dispersed not only to the rear side frame 3 but also to the front side frame 2, so that the load F can be suppressed from being concentrated on the rear side frame 3. Therefore, after the fragile portion 40 is crushed, the rear side frame 3 can be suppressed from being greatly deformed. That is, in the rear side frame 3, the portion other than the fragile portion 40 is formed with relatively high strength, so after the fragile portion 40 is crushed, the portion other than the fragile portion 40 resists the load F and suppresses a large deformation. Therefore, the rear side frame 3 is not easily compressed to a position lower than the front side frame 2.

[0091] Therefore, according to the high roof structure 1, when the load F is input from above, the fragile portion 40 is first crushed, so that both the front side frame 2 and the rear side frame 3 can function as support rods to resist the load F. Therefore, the strength against the load F from above can be ensured. Therefore, deformation of the cab body 10 can be suppressed.

[0092] (2) According to the front roof frame 4 that connects the upper ends of the front side frames 2, the load F inputted from above to the roof panel 20 can be transmitted to each of the front side frames 2 through the front roof frame 4. In addition, the front roof frame 4 functions as a support rod, thereby preventing the front side frames 2 from falling inward in the vehicle width direction D2.

[0093] Similarly, according to the rear roof frame 5 that connects the upper ends of the rear side frames 3, the load F inputted from above to the roof panel 20 can be transmitted to each rear side frame 3 through the rear roof frame 5. In addition, the rear roof frame 5 functions as a support rod, so that the rear side frames 3 can be prevented from falling inward in the vehicle width direction D2.

[0094] Thus, when a load F is input from above, the load F can be more reliably dispersed to each of the front frame 2 and the rear frame 3. Therefore, the load F from above can be more reliably resisted by each of the front frame 2 and the rear frame 3. Therefore, deformation of the cab body 10 can be further suppressed.

[0095] (3) According to the long roof frame 6 extending obliquely along the roof panel 20 and connected to the front roof frame 4 and the rear roof frame 5, the load F inputted from above to the roof panel 20 can be transmitted from the long roof frame 6 to the front side frame 2 and the rear side frame 3 through the front roof frame 4 and the rear roof frame 5. In addition, since the front roof frame 4 and the rear roof frame 5 are reinforced by the long roof frame 6, the front side frame 2 and the rear side frame 3 can be more reliably suppressed from falling inward in the vehicle width direction D2.

[0096] Thus, when a load F is input from above, the load F can be more reliably dispersed to each of the front frame 2 and the rear frame 3. Therefore, the load F from above can be more reliably resisted by each of the front frame 2 and the rear frame 3. Therefore, deformation of the cab body 10 can be further suppressed.

[0097] (4) If the height dimension H1 of the fragile portion 40 is set to be equal to the height difference H2 between the front side frame 2 and the rear side frame 3, when the load F is input from above, the rear side frame 3 after being crushed by the fragile portion 40 can be made to have the same height as the front side frame 2. As a result, the load F is more reliably dispersed to both the front side frame 2 and the rear side frame 3, and thus, the load F can be more reliably suppressed from being concentrated on the rear side frame 3. Therefore, the deformation of the cab body 10 can be further suppressed.

[0098] (5) The rear side frame 3, which forms a closed cross section with the inner frame 31 and the outer frame 32, has a higher rigidity than a structure that does not form a closed cross section, so that the portion forming the closed cross section can be suppressed from being crushed and deformed. As a result, the rear side frame 3 can further resist the load F from above. Therefore, the deformation of the cab body 10 can be further suppressed.

[0099] In addition, according to the fragile portion 40 including the missing portion 41 formed by dividing the inner frame 31, the fragile portion 40 can be reliably formed with a lower strength than the portion forming a closed cross section in the rear side frame 3. Therefore, when the load F is input from above, the fragile portion 40 of the rear side frame 3 can be more reliably crushed. As a result, the load F is more reliably dispersed to both the front side frame 2 and the rear side frame 3, so that the deformation of the cab body 10 can be further suppressed.

[0100] Furthermore, since the missing portion 41 is formed by dividing the inner frame 31 disposed on the inner side of the outer frame 32 in the vehicle width direction D2, the missing portion 41 is covered from the outer side in the vehicle width direction D2 by the outer frame 32. Therefore, compared with the case where the missing portion 41 is exposed on the outer side in the vehicle width direction D2, the ease of mounting the roof panel 20 with respect to the rear side frame 3 and the supporting strength of the rear side frame 3 for the roof panel 20 can be ensured.

[0101] (6) According to the fragile portion 40 including the two recessed portions 42 extending in the vehicle length direction D1 and provided to be separated from each other in the vehicle height direction D3 in the rear side frame 3, when the load F is input from above, the fragile portion 40 is buckled at the recessed portions 42. As a result, the portion between the recessed portions 42 in the rear side frame 3 is easily deformed, so that the fragile portion 40 can be more reliably crushed in the vehicle height direction D3. As a result, the load F is more reliably dispersed to both the front side frame 2 and the rear side frame 3, so that the deformation of the cab body 10 can be further suppressed.

[0102] (7) According to the upper frame 7 that connects the rear side frames 3 to each other at the rear of the rear side frames 3 and above the fragile portion 40, when the load F is input from above, the rear side frames 3 can be suppressed from falling inward in the vehicle width direction D2 without hindering the crushing deformation of the fragile portion 40. In addition, according to the upper frame 7, when the load F is input from above, the crushing speeds of the rear side frames 3 in the vehicle height direction D3 can be made equal to each other.

[0103] Therefore, the load F distributed to the pair of rear side frames 3 can be equalized. As a result, not only the deviation of the load F caused by the difference H2 (which can be called the front-rear difference) between the height of the front side frame 2 and the rear side frame 3 can be suppressed, but also the deviation of the load F caused by the difference in the crushing speed of the pair of rear side frames 3 (which can be called the left-right difference) can be suppressed. Therefore, the load F can be more appropriately distributed to each of the front side frame 2 and the rear side frame 3. Therefore, the deformation of the cab body 10 can be further suppressed.

[0104] (8) According to the lower frame 8 that connects the rear side frames 3 to each other at the rear of the rear side frames 3 and below the fragile portion 40, when the load F is input from above, the rear side frames 3 can be reinforced in a manner that does not hinder the crushing deformation of the fragile portion 40. Therefore, the fragile portion 40 of the rear side frame 3 can be crushed more reliably, and after the fragile portion 40 is crushed, the rear side frame 3 can be suppressed from deforming significantly. As a result, the load F is more reliably distributed to both the front side frame 2 and the rear side frame 3, so that the deformation of the cab body 10 can be further suppressed.

[0105] (9) If a frame extending in the vehicle height direction D3 is provided in the region 50 surrounded by the upper frame 7, the lower frame 8, and the rear side frame 3, the crushing deformation of the fragile portion 40 may be hindered when the load F is input from above. In contrast, when no frame is provided in the region 50, the crushing deformation of the fragile portion 40 is not hindered, so the fragile portion 40 can be crushed more reliably. As a result, the load F is more reliably dispersed to both the front side frame 2 and the rear side frame 3, so that the deformation of the cab body 10 can be further suppressed.

[0106] (10) The lower frame 8 extends forward from the rear frame 3 and is connected to the front frame 2. The front frame 2 and the rear frame 3 serving as the base are connected by the lower frame 8, so that the high roof structure 1 can be effectively reinforced. As a result, the load from above can be more effectively resisted by the front frame 2 and the rear frame 3. Therefore, deformation of the cab body 10 can be further suppressed.

[0107] [2. Second Embodiment]

[0108] [2-1. Structure]

[0109] like Figure 8 As shown, the high roof structure 1' of the second embodiment is different from the high roof structure 1 of the first embodiment in that it is applied to a cab 12 in which an air intake duct 60 is embedded. Hereinafter, the same reference numerals are given to the same or corresponding components as those described in the first embodiment, and repeated descriptions are omitted.

[0110] The air intake duct 60 is a device for supplying air to the engine mounted on the truck 11, and includes a vent pipe (main body) 61 provided at the upper portion of the cab 12, and a duct portion (not shown) provided at the rear of the cab 12. The vent pipe 61 of the present embodiment is embedded in the upper right rear corner of the cab 12, and takes in external air from an opening portion 62 facing the right. On the other hand, the duct portion is connected to the vent pipe 61, and is arranged along the rear portion of the cab body 10 in the space between the cab body 10 and the racked object 13. In addition, a shutter 63 is provided at the opening portion 62.

[0111] The vent duct 61 is provided on the roof panel in a general roof structure, but is embedded in the roof panel 20 in the high roof structure 1. Specifically, the vent duct 61 is disposed in a recess provided in the roof panel 20. Also, the outer surface of the vent duct 61 and the outer surface of the roof panel 20 are formed to be smoothly continuous.

[0112] Since the roof panel 20 of the present embodiment has a recess for accommodating the vent pipe 61 as described above, it has an asymmetric shape. Fig. 9 As shown, a pair of rear side frames 3 among the frames 2 to 9 supporting the roof panel 20 have mutually different shapes. Hereinafter, one rear side frame 3A disposed on the left side of the pair of rear side frames 3 is referred to as "left rear side frame 3A", and the other rear side frame 3B disposed on the right side is referred to as "right rear side frame 3B".

[0113] In the present embodiment, the fragile portion 40 is provided only on the left rear side frame 3A (either one of the pair of rear side frames 3). In other words, the fragile portion 40 is not provided on the right rear side frame 3B (the other rear side frame 3) on the side where the air intake duct 60 is arranged. The left rear side frame 3A provided with the fragile portion 40 is configured in the same manner as the rear side frame 3 described in the above embodiment.

[0114] On the other hand, the right rear side frame 3B without the fragile portion 40 has a bent portion 30 bent inward in the vehicle width direction D2 for arranging the air intake duct 60. The bent portion 30 has a shape corresponding to the above-mentioned recess provided in the roof panel 20. Such a bent portion 30 is provided only in the right rear side frame 3B on the side where the air intake duct 60 is arranged, and is not provided in the left rear side frame 3A on the opposite side.

[0115] like Fig. 9 , 10 As shown in FIG. 1 , the right rear side frame 3B of the present embodiment includes a lower portion 3c extending substantially straight upward from the right side portion 15, the above-mentioned bent portion 30 bent obliquely upward and inwardly in the vehicle width direction D2 from the lower portion 3c (leftward in the present embodiment), and an upper portion 3d extending substantially straight upward from the bent portion 30. In the right rear side frame 3B, by providing the bent portion 30 between the lower portion 3c and the upper portion 3d, the upper portion 3d is arranged above the lower portion 3c and inwardly in the vehicle width direction D2.

[0116] The upper arm portion 7a of one side (right side in this embodiment) of the upper frame 7 is connected to the upper portion 3d of the right rear side frame 3B. In addition, the lower arm portion 8a of one side (right side in this embodiment) of the lower frame 8 is connected to the lower portion 3c of the right rear side frame 3B. Although not shown in detail, the right rear side frame 3B may be a structure that forms a closed cross section similar to the left rear side frame 3A. In addition, a reinforcing rib similar to the above-mentioned rib 39 may be formed on the right rear side frame 3B in a straight line extending in the vehicle height direction D3.

[0117] [2-2. Action and effect]

[0118] The right rear side frame 3B of the present embodiment has the bent portion 30 bent inwardly in the vehicle width direction D2, and therefore, when a load F is inputted from above, it is more likely to fall inwardly in the vehicle width direction D2 and to be crushed in the vehicle height direction D3, compared with a case without the bent portion 30. Therefore, assuming that the fragile portion 40 is not provided on either side of the rear side frame 3, a difference in crushing speed is likely to occur between the left rear side frame 3A and the right rear side frame 3B.

[0119] In contrast, in the high roof structure 1', the fragile portion 40 is provided only in the left rear side frame 3A, so when the load F is input from above, the fragile portion 40 of the left rear side frame 3A is crushed in the vehicle height direction D3. As a result, the left rear side frame 3A is compressed in the vehicle height direction D3, so even if the right rear side frame 3B falls inward in the vehicle width direction D2, the difference in crushing speed between the left rear side frame 3A and the right rear side frame 3B can be reduced.

[0120] Therefore, according to the high roof structure 1', even if the bent portion 30 is provided on either of the rear side frames 3, the load F distributed to the pair of rear side frames 3 can be equalized. Therefore, not only the deviation of the load F caused by the height difference H2 between the front side frame 2 and the rear side frame 3 can be suppressed, but also the deviation of the load F caused by the difference in crushing speed of the pair of rear side frames 3 can be suppressed. Therefore, the deformation of the cab body 10 can be further suppressed.

[0121] In addition, according to the upper frame 7 connecting the left rear frame 3A provided with the fragile portion 40 and the right rear frame 3B having the bent portion 30, it is possible to suppress the right rear frame 3B from falling inward in the vehicle width direction D2 in a manner that does not hinder the crushing deformation of the fragile portion 40 as described above. In addition, according to the upper frame 7, it is possible to make the crushing speeds of the rear side frames 3 in the vehicle height direction D3 equal to each other as described above. Therefore, even if the bent portion 30 is provided on either side of the rear side frame 3, it is possible to suppress the deviation of the load F in the front side frame 2 and the rear side frame 3 as described above. Therefore, the deformation of the cab body 10 can be further suppressed.

[0122] Furthermore, according to the high roof structure 1 ′ of the present embodiment, the same operations and effects as those of the above-described first embodiment can be obtained from the same configuration.

[0123] [3. Modifications]

[0124] The above-mentioned structure of the fragile portion 40 is an example. The fragile portion 40 may omit the missing portion 41 or the recessed portion 42 , or may be formed by a structure other than the missing portion 41 and the recessed portion 42 .

[0125] The structure of the rear side frame 3 described above is also an example. The closed cross section of the rear side frame 3 may be formed by, for example, joining the outer frame 32 described above having a hat-shaped cross section to a flat inner frame, or may be formed by a single cylindrical frame. In addition, the rear side frame 3 may also be a structure without a closed cross section. The structure of the front side frame 2 is also not particularly limited.

[0126] The high roof structure 1, 1' only needs to be provided with a pair of front side frames 2, a pair of rear side frames 3, and at least one fragile portion 40. Thus, even when the front roof frame 4, the rear roof frame 5, etc. are omitted, according to the high roof structure 1, 1', by providing the fragile portion 40, the deformation of the cab body 10 can be suppressed against the load F from above as described above.

[0127] The long roof frame 6 only needs to be connected to at least the front roof frame 4 and the rear roof frame 5. Therefore, the long roof frame 6 may omit the extended portion 6a connected to the rear side frame 3.

[0128] The lower frame 8 only needs to be connected to at least the rear side frame 3, and may not be connected to the front side frame 2. When the lower frame 8 is not connected to the front side frame, it may not extend forward beyond the rear side frame 3.

[0129] In the second embodiment described above, the air intake duct 60 is provided at the upper right side of the cab 12, but the air intake duct 60 may be provided at the upper left side of the cab 12. In this case, the bent portion 30 is provided at the left rear frame 3A and the fragile portion 40 is provided only at the right rear frame 3B. In addition, the specific shape of the bent portion 30 can be appropriately changed according to the shape of the air intake duct 60.

[0130] [4. Note]

[0131] The following supplementary notes are further disclosed with respect to the above-mentioned embodiments.

[0132] (Note 1)

[0133] A high roof structure of a truck, characterized in that the high roof structure of the truck is installed above a cab main body with an open roof portion, and is provided with a roof panel inclined in such a manner that the vehicle height gradually increases from the front toward the rear.

[0134] The high roof structure of the truck has:

[0135] a pair of front side frames, the pair of front side frames are respectively erected from a pair of side portions arranged in the cab body to be separated from each other in the vehicle width direction and support the roof panel;

[0136] a pair of rear side frames, the pair of rear side frames being erected from the pair of side portions at a position rearward of the front side frames and being higher than the front side frames respectively, and supporting the roof panel; and

[0137] A fragile portion is provided on at least one of the rear side frames and is formed to have relatively lower strength than a portion adjacent thereto in the vehicle height direction.

[0138] (Note 2)

[0139] The high roof structure of the truck according to Supplementary Note 1 is characterized in that:

[0140] The high roof structure of the truck has:

[0141] a front roof frame connecting upper end portions of the front side frames to each other; and

[0142] A rear roof frame connects upper end portions of the rear side frames to each other.

[0143] (Note 3)

[0144] The high roof structure of the truck according to Supplementary Note 2 is characterized in that:

[0145] The high roof structure of the truck includes a long roof frame that extends obliquely along the roof panel from a front portion of the cab body that is disposed forward of the pair of side portions and is connected to the front roof frame and the rear roof frame.

[0146] (Note 4)

[0147] The high roof structure for a truck according to any one of Supplementary Notes 1 to 3, characterized in that:

[0148] The dimension of the fragile portion in the vehicle height direction is set to be equal to the difference in height between the front side frame and the rear side frame.

[0149] (Note 5)

[0150] The high roof structure for a truck according to any one of Supplementary Notes 1 to 4, characterized in that:

[0151] The rear side frame includes an inner frame and an outer frame which is arranged outside the inner frame in the vehicle width direction and forms a closed cross section with the inner frame.

[0152] The fragile portion includes a missing portion formed by the inner frame being divided and broken.

[0153] (Note 6)

[0154] The high roof structure for a truck according to any one of Supplementary Notes 1 to 5, characterized in that:

[0155] The fragile portion includes two recessed portions extending in the vehicle length direction in the rear side frame and provided to be separated from each other in the vehicle height direction.

[0156] (Note 7)

[0157] The high roof structure for a truck according to any one of Supplementary Notes 1 to 6, characterized in that:

[0158] The high roof structure of the truck includes an upper frame that connects the rear side frames to each other at a position rearward of the rear side frames and above the fragile portion.

[0159] (Note 8)

[0160] The high roof structure for a truck according to any one of Supplementary Notes 1 to 7, characterized in that:

[0161] The high roof structure of the truck includes a lower frame that connects the rear side frames to each other at a position rearward of the rear side frames and below the fragile portion.

[0162] (Note 9)

[0163] The high roof structure of the truck according to Supplement 8 referring to Supplement 7 is characterized in that:

[0164] No frame is arranged in a region surrounded by the upper frame, the lower frame, and the rear frame.

[0165] (Note 10)

[0166] The high roof structure of a truck according to Supplementary Note 8 or 9 is characterized in that:

[0167] The lower frame extends forward from the rear frame and is coupled to the front frame.

[0168] (Note 11)

[0169] The high roof structure for a truck according to any one of Supplementary Notes 1 to 10, characterized in that:

[0170] The fragile portion is provided only on one side of the rear side frame.

[0171] The other rear side frame, which is not provided with the fragile portion, has a bent portion bent inward in the vehicle width direction for arranging the air intake passage.

[0172] Description of Reference Numerals

[0173] 1. 1′ high roof structure (high roof structure of truck)

[0174] 2Front side frame

[0175] 3Rear side frame

[0176] 3A Left rear frame

[0177] 3B Right rear frame

[0178] 3c Lower part

[0179] 3d upper

[0180] 4Front roof frame

[0181] 5Rear roof frame

[0182] 6 Long roof frame

[0183] 6a Extension

[0184] 7 Upper frame

[0185] 7a Upper arm

[0186] 7b Upper connection

[0187] 8 Lower frame

[0188] 8a Lower arm

[0189] 8b Lower connection

[0190] 9 Auxiliary roof frame

[0191] 10 Cab body

[0192] 11 Truck

[0193] 12 Cab

[0194] 13 Shelf items

[0195] 14 Strengthen the skeleton

[0196] 15 Side face

[0197] 16 Front

[0198] 20 Roof Panel

[0199] 21 Central Panel

[0200] 22 Side Panel

[0201] 30 Bending section

[0202] 31 Inner frame

[0203] 32 outer frame

[0204] 33 Upper component

[0205] 34 Lower member

[0206] 35 Flange

[0207] 36 belly

[0208] 37 belly

[0209] 38 Flange

[0210] 39 tendons

[0211] 40 Ministry of Vulnerability

[0212] 41 Missing part

[0213] 42 recess

[0214] 50 Areas

[0215] 60 Intake channel

[0216] 61 Ventilation pipe

[0217] 62 Opening

[0218] 63 Shutters

[0219] D1 Vehicle length direction (front and rear direction)

[0220] D2 Vehicle width direction (left and right direction)

[0221] D3 vehicle height direction (up and down direction)

[0222] F Load

[0223] H horizontal plane

[0224] H1 Height

[0225] H2 Height Difference

Claims

1. A high roof structure for a truck, characterized in that: The high roof structure of the truck is installed above the main body of the cab with an open roof portion, and is provided with a roof panel inclined in such a way that the vehicle height gradually increases from the front to the rear. The high roof structure of the truck has: a pair of front side frames, the pair of front side frames are respectively erected from a pair of side portions arranged in the cab body to be separated from each other in the vehicle width direction, and support the roof panel; a pair of rear side frames, the pair of rear side frames being erected from the pair of side portions at a position rearward of the front side frames and respectively higher than the front side frames, and supporting the roof panel; as well as The fragile portion is provided on at least one of the rear side frames and is formed to have relatively lower strength than a portion adjacent thereto in the vehicle height direction.

2. The high roof structure of a truck according to claim 1, characterized in that: The high roof structure of the truck has: a front roof frame connecting upper end portions of the front side frames to each other; and A rear roof frame connects upper end portions of the rear side frames to each other.

3. The high roof structure of a truck according to claim 2, characterized in that: The high roof structure of the truck includes a long roof frame that extends obliquely along the roof panel from a front portion of the cab body disposed forward of the pair of side portions and is connected to the front roof frame and the rear roof frame.

4. The high roof structure of a truck according to claim 1, characterized in that: The dimension of the fragile portion in the vehicle height direction is set to be equal to the difference in height between the front side frame and the rear side frame.

5. The high roof structure of a truck according to claim 1, characterized in that: The rear side frame includes an inner frame and an outer frame which is arranged outside the inner frame in the vehicle width direction and forms a closed cross section with the inner frame. The fragile portion includes a missing portion formed by the inner frame being divided and broken.

6. The high roof structure of the truck according to claim 1, The fragile portion includes two recessed portions extending in the vehicle length direction in the rear side frame and provided to be separated from each other in the vehicle height direction.

7. The high roof structure of a truck according to claim 1, characterized in that: The high roof structure of the truck includes an upper frame that connects the rear side frames to each other at a position rearward of the rear side frames and above the fragile portion.

8. The high roof structure of a truck according to claim 1, characterized in that: The high roof structure of the truck includes a lower frame that connects the rear side frames to each other at a position rearward of the rear side frames and below the fragile portion.

9. The high roof structure of a truck according to claim 1, characterized in that: The fragile portion is provided only on one side of the rear side frame. The other rear side frame, which is not provided with the fragile portion, has a bent portion bent inward in the vehicle width direction for arranging the air intake passage.

Images