Rear structure of frame vehicle

Abstract

A rear section structure (10) of a frame vehicle is for a frame vehicle obtained by mounting a mounting object (20) on a frame (1), and comprises a suspension component (6) and a harness (8). The harness (8) has a first section (11) that is fixed to an inside surface (3) of a side frame (2), further to the front than the suspension component (6), a second section (12) that is provided continuous with the rear of the first section (11) and is routed toward the rear, separating away from the inside surface (3), further to the inside in the vehicle width direction than the suspension component (6), a third section (13) that is provided continuous with the rear of the second section (12) and is fixed to a cross frame (4), and a fourth section (14) that is provided continuous with the rear of the third section (13) and is fixed to the inside surface (3), further to the rear than the cross frame (4).

Description

[Technical Field]

[0001] This case relates to a rear structure of a frame vehicle in which an attachment is mounted on a frame. [Background technology]

[0002] Conventionally, frame vehicles have been known in which mounted components such as a cargo bed and a passenger compartment are mounted on a frame. In this type of vehicle, the volume of the mounted components can be increased without changing the vehicle height by reducing the gap between the lower end of the mounted components and the upper surface of the frame. However, the smaller the gap between the lower end of the mounted components and the upper surface of the frame, the less easy it is to route wire harnesses connected to various electrical components. Therefore, it has been proposed to use the interior of the frame or the inner portion in the vehicle width direction as space for routing harnesses (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-291666 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, suspension components (shock absorbers, coil springs, etc.) that make up a suspension device are attached to the frame of a frame vehicle. When attaching the suspension components to the frame, if a wire harness is routed along the frame, it becomes necessary to fix the suspension device in a position separated from the frame so as not to interfere with the wire harness.

[0005] This can reduce the rigidity of the suspension component mounting points or reduce the extension / contraction stroke of the suspension components when the vehicle rolls, resulting in poor suspension performance. On the other hand, routing the wire harness on the top surface of the frame can prevent interference between the suspension device and the wire harness. However, this raises the bottom end position (floor height) of the mounted object by an amount equivalent to the thickness of the wire harness, which reduces the volume of the mounted object unless the vehicle height (height of the frame relative to the road surface) is lowered.

[0006] One of the objectives of the present invention, which was devised in light of the above-mentioned problems, is to provide a rear structure for a frame vehicle that allows for a low floor for mounted equipment without difficulty while realizing good suspension performance. However, in addition to this objective, another objective of the present invention is to achieve effects derived from the various configurations shown in the "Mode for Carrying Out the Invention" below, which are not obtainable with conventional technology. [Means for solving the problem]

[0007] The disclosed rear structure of a frame vehicle can be realized in the following aspects or application examples, and solves at least some of the above problems. The disclosed rear structure for a frame vehicle is a rear structure for a frame vehicle in which a mounted object is mounted on a frame that spans a pair of side frames and a cross frame. The structure includes a suspension component attached to the inner surface of at least one of the side frames in the vehicle width direction below the mounted object and forward of the cross frame, a harness routed from the front to the rear of the suspension component below the highest part of the upper surface of the side frame, and a bracket extending forward from the cross frame at a position spaced from the inner surface of the side frame and inward in the vehicle width direction of the suspension component.

[0008] The harness has a first portion fixed to the inner surface forward of the suspension component, a second portion that is continuous with the first portion rearward and is spaced from the inner surface and routed rearward and inward in the vehicle width direction of the suspension component, a third portion that is continuous with the rear of the second portion and fixed to the cross frame, and a fourth portion that is continuous with the rear of the third portion and fixed to the inner surface rearward of the cross frame, and the second portion is supported by the bracket, detouring from the inner surface of the side frame to the inside of the suspension component in the vehicle width direction. [Effects of the Invention]

[0009] According to the disclosed rear structure of a frame vehicle, it is possible to naturally lower the floor of mounted equipment while achieving good suspension performance. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a perspective view illustrating the rear structure of a frame vehicle according to an embodiment. [Figure 2] FIG. 2 is a top view of the rear structure shown in FIG. 1. [Figure 3] FIG. 2 is a side cross-sectional view of the rear structure shown in FIG. [Figure 4] FIG. 2 is a rear view of the rear structure shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes embodiments to which the disclosed rear structure for a frame vehicle is applied. The following embodiments are merely examples, and are not intended to exclude various modifications or applications of techniques not explicitly stated in the following embodiments. The configurations of the following embodiments can be implemented with various modifications within the scope of their spirit. Furthermore, they can be selected or combined as needed. In the following description, the forward direction of the vehicle is defined as the forward direction (front of the vehicle), and left and right are defined based on the forward direction. [Example]

[0012] [1. Configuration] FIG. 1 is a perspective view illustrating a rear structure 10 for a frame vehicle as an embodiment, FIG. 2 is a top view thereof, FIG. 3 is a side cross-sectional view thereof, and FIG. 4 is a rear view thereof. The vehicle to which the rear structure 10 as an embodiment is applied is a frame vehicle having a mounted object 20 mounted on a frame 1. The frame vehicles referred to here include SUVs (Sport utility vehicles), off-road vehicles, buses, trucks, etc. The rear structure 10 as an embodiment is applied to the frame 1 of the frame vehicle near the rear wheels and below the mounted object 20. The mounted object 20 referred to here includes a luggage compartment, a loading platform, a passenger compartment (cabin), as well as a container, a crane, a work device, etc.

[0013] As shown in Figures 1 and 2, the frame 1 is formed by bridging a cross frame 4 between a pair of side frames 2. The side frames 2 are frames that extend in the fore-and-aft direction of the vehicle (vehicle length direction). The side frames 2 are also called side rails or side members, and are arranged in a pair approximately symmetrically (plane symmetrically) with a gap in the vehicle width direction. The cross frame 4 is a frame that extends in the vehicle width direction. The cross frame 4 is also called a cross member, and is provided to connect the pair of side frames 2 in the vehicle width direction. The cross frame 4 is provided in multiple positions with gaps in the fore-and-aft direction of the vehicle. Figures 1 to 4 show only one cross frame 4 located near the rear wheel. The side frames 2 and the cross frame 4 preferably have a hollow, closed cross-section structure. The frame 1 consisting of the side frames 2 and the cross frame 4 is also called a ladder frame.

[0014] As shown in Fig. 3, the shape of the side frame 2 in a side view is formed in a shape that is bent upward so as to go around the axle near the rear wheel. This bent portion is called a bent portion 24. The highest portion of the upper surface of the side frame 2 (the portion at height A in Fig. 4) is included in the bent portion 24. By providing such bent portion 24 near the rear wheel, it becomes easier to ensure the distance (vertical separation dimension) between the side frame 2 and the axle of the rear wheel.

[0015] As shown in Fig. 3, the cross frame 4 is positioned slightly rearward of the bent portions 24 of the side frames 2. As shown in Fig. 4, the thickness (vertical dimension) of the cross frame 4 is greatest at both left and right ends connected to the side frames 2, and thinner at the middle portion in the vehicle width direction. The upper surface 5 of the cross frame 4 is highest at the point where it is connected to the side frames 2 (height B in Fig. 4), and is recessed downward at the middle portion in the vehicle width direction (height C in Fig. 4).

[0016] As shown in Fig. 1, suspension components 6, 7 are provided near the bent portion 24 of the side frame 2. The suspension components 6, 7 are components that constitute a rear wheel suspension device, such as shock absorbers (dampers) and springs. As shown in Fig. 3, the suspension components 6, 7 are disposed below the mounted object 20 and forward of the cross frame 4. The suspension components 6, 7 are attached to the inner surface 3 of the side frame 2 in the vehicle width direction.

[0017] In the example shown in FIGS. 1 to 4, the suspension components 6, 7 include a first absorber 6 attached to the inner surface 3 of the left side frame 2 and a second absorber 7 attached to the inner surface 3 of the right side frame 2. The first absorber 6 and the second absorber 7 are provided to connect the side frame 2 and a differential device 21 connected to the rear wheels. As shown in FIG. 3, the first absorber 6 is attached to the left side frame 2 in an attitude inclined downward toward the front. On the other hand, the second absorber 7 is attached to the right side frame 2 in an attitude inclined downward toward the rear. As a result, the layout of the first absorber 6 and the second absorber 7 is V-shaped in side view, which increases windup rigidity (rigidity against torsional deformation of the axle that occurs when the vehicle accelerates or decelerates).

[0018] As shown in FIGS. 2 and 4, a spare tire 18 and a tank 19 are disposed below the cross frame 4. The tank 19 is a container such as a fuel tank or a urea water tank. A bracket 9 extending forward is fixed to the cross frame 4. The bracket 9 is a rod-shaped member for supporting a harness 8, which will be described later. The bracket 9 is positioned at a distance from the inner surface 3 of the side frame 2. In the example shown in FIG. 2, the bracket 9 is disposed near the boundary between the spare tire 18 and the tank 19 in a top view. As shown in FIG. 3, the length of the bracket 9 is set to a dimension approximately equal to the length from the front end of the cross frame 4 to the upper end of the first absorber 6 in a side view.

[0019] The differential device 21 has a case portion 22 and a pair of shaft portions 23. The case portion 22 is a container-shaped portion that houses a differential gear that distributes driving force to the left and right wheels, and is also called a casing or a differential case. An input shaft (e.g., a propeller shaft) that inputs driving force to the differential device 21 is connected to the front end of the case portion 22. The shaft portions 23 are axial portions that extend to the left and right from both side surfaces of the case portion 22 and are connected to the left and right wheels, and are also called axle shaft portions or drive shaft portions.

[0020] A right axle shaft connected to a right side gear that constitutes a differential gear is inserted inside the right shaft portion 23, and a left axle shaft connected to a left side gear that constitutes a differential gear is inserted inside the left shaft portion 23. The first absorber 6 functions to absorb vibrations with the left shaft portion 23 suspended from the left side frame 2, and the second absorber 7 functions to absorb vibrations with the right shaft portion 23 suspended from the right side frame 2.

[0021] As shown in Fig. 1, a harness 8 (wire harness) connected to various electrical components is attached to the side frame 2 near the suspension components 6, 7. The harness 8 is routed below the highest part (height A in Fig. 4) of the upper surface of the side frame 2, and is routed from the front to the rear of the suspension components 6, 7. Figs. 1 to 4 show an example in which the harness 8 is routed along the left side frame 2. The front end of the harness 8 is connected to the on-board battery and electronic control device, and the rear end is connected to electrical components such as tail lights, brake lights, reverse lights, a rear camera, rear sensors, and pumps in the tank 19 (fuel tank pump, urea water tank pump).

[0022] As shown in FIGS. 1 and 2, the harness 8 has a first portion 11, a second portion 12, a third portion 13, a fourth portion 14, and a fifth portion 15. The first portion 11 is a portion that is fixed to the inner surface 3 of the side frame 2 forward of the first absorber 6. The first portion 11 is routed in the fore-and-aft direction of the vehicle along the inner surface 3 of the side frame 2. The first portion 11 is attached to the inner surface 3 via, for example, a plurality of fasteners 17 (wire harness clips).

[0023] The second portion 12 is a portion provided continuously rearward from the first portion 11. The second portion 12 is disposed at a distance from the inner surface 3 of the side frame 2 so as to bypass the first absorber 6 (suspension component) inward in a top view. As a result, the second portion 12 is routed rearward and inward in the vehicle width direction relative to the first absorber 6. Note that the second portion 12 is not fixed to the inner surface 3 of the side frame 2. As shown in FIG. 2 , the portion of the inner surface 3 of the side frame 2 that is rearward of the first absorber 6 and forward of the cross frame 4 is a surface to which nothing is attached.

[0024] 3, the second portion 12 in a side view is routed so as to avoid the upper end portion of the first absorber 6 (the fastener for fixing the first absorber 6 to the side frame 2). Furthermore, as shown in FIG. 2, the second portion 12 is supported by a bracket 9 via a fastener 17. The bracket 9 is provided so as to support the portion of the second portion 12 that is located closest to the vehicle interior. This suppresses shaking and sagging of the second portion 12, and stabilizes the attachment state of the harness 8.

[0025] The third section 13 is a section provided continuously to the rear of the second section 12. The third section 13 is routed approximately horizontally along the upper surface 5 of the cross frame 4 and fixed to the cross frame 4 via fasteners 17. The third section 13 is fixed to a portion of the upper surface 5 of the cross frame 4 that is recessed below the upper surface of the side frame 2 at the connection point with the side frame 2 (a portion at height C in FIG. 4). The fixed position of the third section 13 relative to the cross frame 4 is a position spaced apart from the inner surface 3 of the side frame 2, as shown in FIG. 2. The third section 13 is routed approximately parallel to the inner surface 3 of the side frame 2. The distance from height A to height C in FIG. 4 is set to be greater than the height dimension of the third section 13 including the fasteners 17. This prevents interference between the third section 13 and the mounted object 20.

[0026] The fourth portion 14 is a portion that is provided continuously to the rear of the third portion 13. The fourth portion 14 is fixed to the inner surface 3 of the side frame 2 rearward of the cross frame 4. The fourth portion 14 is attached to the inner surface 3, for example, via a plurality of fasteners 17. The position of the fourth portion 14 in the height direction is set lower than the upper surface of the side frame 2 rearward of the cross frame 4. The fourth portion 14 shown in FIG. 3 extends substantially horizontally, similar to the side frame 2 rearward of the cross frame 4.

[0027] The fifth section 15 is a portion branched off from the second section 12. A branching portion 16 between the second section 12 and the fifth section 15 is located at least forward of the cross frame 4, and preferably located adjacent to the bracket 9. The fifth section 15 is fixed to the upper surface 5 of the cross frame 4 separately from the third section 13. In this embodiment, the fifth section 15 includes two sub-harnesses 25, 26.

[0028] As shown in Figures 1 and 2, the fifth section 15 has a first sub-harness 25 extending toward the rear end of the right side frame 2 (e.g., a right tail light, brake light, reverse light, etc.) and a second sub-harness 26 extending toward the tank 19 (e.g., a fuel tank pump, a urea water tank pump, etc.). The first sub-harness 25 extends in the vehicle width direction along the upper surface 5 of the cross frame 4 and is fixed to the upper surface 5 of the cross frame 4 via fasteners 17. The second sub-harness 26 extends in the vehicle fore-and-aft direction along the bracket 9 toward the front of the cross frame 4 and is fixed to the upper surface 5 of the cross frame 4 and the bracket 9 via fasteners 17, and extends to the tank 19 below.

[0029] [2. Actions and Effects] (1) The rear structure 10 for a frame vehicle of this embodiment includes a first absorber 6 (suspension component) and a harness 8. The first absorber 6 is attached to the inner surface 3 of one of the side frames 2 in the vehicle width direction. The harness 8 is routed from the front to the rear of the first absorber 6 below the highest part of the upper surface of the side frame 2. The harness 8 also has a first portion 11, a second portion 12, a third portion 13, and a fourth portion 14.

[0030] The first portion 11 is fixed to the inner surface 3 of the side frame 2 forward of the first absorber 6. The second portion 12 is provided continuous with the rear of the first portion 11 and is spaced from the inner surface 3 of the side frame 2, and is routed rearward and inward of the first absorber 6 in the vehicle width direction. The third portion 13 is provided continuous with the rear of the second portion 12 and is fixed to the cross frame 4. The fourth portion 14 is provided continuous with the rear of the third portion 13 and is fixed to the inner surface 3 of the side frame 2 rearward of the cross frame 4.

[0031] In this way, routing the harness 8 below the highest part of the upper surface of the side frame 2 prevents interference between the harness 8 and the mounted object 20, and promotes a lower floor for the mounted object 20. For example, lowering the floor of the loading platform makes it easier to load and unload luggage, improving the convenience of the vehicle. Alternatively, the volume of the container or passenger compartment can be increased without changing the vehicle height.

[0032] Furthermore, by separating the second portion 12 of the harness 8 from the inner surface 3 of the side frame 2 so as to bypass the first absorber 6, interference between the first absorber 6 and the harness 8 can be prevented. Furthermore, by having the harness 8 bypass the vicinity of the first absorber 6, the first absorber 6 can be brought closer to the inner surface 3 of the side frame 2. In other words, it is easy to position the first absorber 6 closer to the outer side in the vehicle width direction. Therefore, it is easier to ensure the vibration damping stroke of the first absorber 6 when the vehicle body rolls, and the frame-side mounting rigidity of the first absorber 6 can be improved, thereby improving suspension performance. Therefore, with the rear structure 10 for a frame vehicle of this embodiment, the mounted object 20 can be reasonably low-floor while achieving good suspension performance.

[0033] (2) In this embodiment, the third portion 13 of the harness 8 is fixed to a portion of the upper surface 5 of the cross frame 4 that is recessed below the upper surface of the side frame 2 at the connection point between the cross frame 4 and the side frame 2. This configuration improves the effect of preventing interference between the harness 8 and the mounted object 20, and promotes the lowering of the floor of the mounted object 20. Furthermore, even if the height dimension of the third portion 13 including the fastener 17 is relatively large, a sufficient gap can be secured between the fastener 17 and the mounted object 20, preventing deformation or damage of the fastener 17.

[0034] (3) In this embodiment, a bracket 9 is provided that extends forward from the cross frame 4 and supports the second portion 12 of the harness 8. This configuration prevents movement or deformation of the second portion 12 due to vehicle body vibration, thereby stabilizing the attached state of the harness 8. Furthermore, the bracket 9 is provided to support the portion of the second portion 12 that is located closest to the vehicle interior. This effectively suppresses shaking and sagging of the second portion 12, further stabilizing the attached state of the harness 8.

[0035] (4) The harness 8 of this embodiment has a fifth portion 15. The fifth portion 15 is branched off from the second portion 12 and is fixed to the upper surface 5 of the cross frame 4 separately from the third portion 13. Furthermore, a branching portion 16 between the second portion 12 and the fifth portion 15 is disposed forward of the cross frame 4. In this way, by disposing the branching portion 16, which tends to have a large diameter, forward of the cross frame 4, it is possible to prevent interference between the harness 8 and the mounted object 20, and it is possible to facilitate a lower floor of the mounted object 20.

[0036] (5) In this embodiment, the bracket 9 is disposed adjacent to the branching portion 16 between the second portion 12 and the fifth portion 15. This configuration facilitates stable support of the second portion 12 and the fifth portion 15 relative to the bracket 9. This prevents movement or deformation of the second portion 12 and the fifth portion 15 due to vehicle body vibration, thereby stabilizing the attachment state of the harness 8. Furthermore, because the sides of the branching portion 16 are covered by the bracket 9, cracking of the branching portion 16 due to, for example, an external force can be prevented, thereby enhancing protection of the harness 8. Furthermore, the second sub-harness 26 of the fifth portion 15, which extends toward the tank 19 located below the cross frame 4, is also fixed to the bracket 9, thereby preventing movement or deformation of the second sub-harness 26 and stabilizing the attachment state.

[0037] (6) In this embodiment, a first absorber 6 is attached to the left side frame 2, and a second absorber 7 is attached to the right side frame 2. As shown in FIG. 3 , the first absorber 6 is disposed in a position inclined downward toward the front, and the second absorber 7 is disposed in a position inclined downward toward the rear. The first absorber 6 is disposed between the side frame 2 and the second portion 12 of the harness 8. In other words, the harness 8 is routed from the front to the rear of the first absorber 6 along the side frame 2 to which the first absorber 6 is attached.

[0038] This configuration can shorten the distance (distance in the vehicle's fore-and-aft direction) between the first absorber 6 and the cross frame 4. In other words, the length of the second portion 12 that bypasses the first absorber 6 can be shortened, and movement and deformation of the second portion 12 due to vehicle body vibration can be suppressed. This can stabilize the attachment state of the harness 8. Furthermore, because the first absorber 6 and the second absorber 7 are arranged in a V-shape in a side view, the windup rigidity of the vehicle can be increased, and suspension performance can be improved.

[0039] [3. Other] In the above embodiment, the upper surface 5 of the cross frame 4 is recessed downward, but the shape of the cross frame 4 is not limited to this. For example, the upper surface 5 of the cross frame 4 may be formed as a horizontal plane. By routing the harness 8 below at least the highest part of the upper surface of the side frame 2, interference between the harness 8 and the mounted object 20 can be prevented, and the same effect as in the above embodiment can be achieved.

[0040] Furthermore, in the above embodiment, the cross frame 4 to which the bracket 9 is fixed is exemplified, but the bracket 9 may be omitted. Furthermore, in the above embodiment, the harness 8 provided with the fifth portion 15 is exemplified, but the fifth portion 15 and the branch portion 16 may be omitted. In the harness 8 provided with at least the first portion 11 to the fourth portion 14, by separating the second portion 12 from the inner surface 3 and routing it rearward and inward in the vehicle width direction from the first absorber 6, it is possible to increase the movable range of the first absorber 6 while preventing interference between the harness 8 and the first absorber 6, and to obtain the same effects as in the above embodiment.

[0041] Furthermore, in the above embodiment, a suspension system in which the first absorber 6 and the second absorber 7 are arranged in a V-shape in a side view is illustrated, but the layout of the suspension components 6, 7 is not limited to this. By providing the harness 8 with the second portion 12 that is routed rearward and inward in the vehicle width direction from at least one of the suspension components 6, 7, it is possible to obtain the same effects as in the above embodiment. [Industrial Applicability]

[0042] The present invention is applicable to the manufacturing industry of vehicle frames to which suspension parts and harnesses are attached, and also to the manufacturing industry of frame vehicles in which mounted objects are mounted on frames. [Explanation of symbols]

[0043] 1 frame 2 Side Frame 3 Inner surface 4 Cross Frame 5 Top side 6 First absorber (suspension part) 7 Second absorber (suspension part) 8. Harness 9 Bracket 10 Rear structure 11 First part 12 Second part 13 Third part 14 Fourth part 15 Fifth part 16 Branch 17 Fasteners 18 Spare tire 19. Tank 20 Bodywork 21 Differential device 22 Case part 23 Shaft 24 Bend 25 First sub-harness 26 Second sub-harness

Claims

1. A rear structure of a frame vehicle in which a cross frame is spanned between a pair of side frames and an attached object is mounted on the frame, a suspension component attached to an inner surface of at least one of the side frames in the vehicle width direction below the mounted object and forward of the cross frame; a harness routed from the front to the rear of the suspension component below the highest portion of the upper surface of the side frame; a bracket extending forward from the cross frame at a position spaced apart from the inner surface of the side frame and more inward in the vehicle width direction than the suspension component, the harness has a first portion fixed to the inner surface forward of the suspension component, a second portion provided continuously to the rear of the first portion and spaced from the inner surface and routed rearward and inward of the suspension component in the vehicle width direction, a third portion provided continuously to the rear of the second portion and fixed to the cross frame, and a fourth portion provided continuously to the rear of the third portion and fixed to the inner surface rearward of the cross frame, The second portion is supported by the bracket while bypassing the suspension component from the inner surface of the side frame toward the inside in the vehicle width direction. A rear structure of a frame vehicle.

2. The third portion is fixed to a portion of the upper surface of the cross frame that is recessed downward from the upper surface of the side frame at a connection point between the cross frame and the side frame.

2. The rear structure of a frame vehicle according to claim 1.

3. (delete)

4. the harness has a fifth portion branched from the second portion and fixed to the upper surface of the cross frame separately from the third portion, A branching portion between the second portion and the fifth portion is disposed forward of the cross frame.

3. The rear structure of a frame vehicle according to claim 1 or 2.

5. The bracket is positioned adjacent to the branch.

5. The rear structure of a frame vehicle according to claim 4.

6. the suspension component has a first absorber attached to one of the side frames in an attitude inclined downward toward the front, and a second absorber attached to the other side frame in an attitude inclined downward toward the rear, The first absorber is disposed between the inner surface of one of the side frames and the second portion.

6. The rear structure of a frame vehicle according to claim 1, 2, 4 or 5.

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