JP6736376B2 - Power line support structure - Google Patents

Description

The present invention relates to a power line support structure capable of preventing a power line having an engine or a transmission as a constituent element from dropping out of a vehicle body frame during a frontal collision of a vehicle with a high probability.

A large vehicle such as a truck is provided with a body frame composed of a pair of side frames and a cross member that connects the pair of side frames in the vehicle width direction, and an engine or a transmission is provided between the pair of side frames. A power line having components such as is disposed.

Patent Document 1 discloses an example of a support structure for a power line in a vehicle having such a structure. In Patent Document 1, the engine forming the power line is supported by the vehicle body frame via an engine mount fixed to each of the pair of side frames.

JP, 2011-131658, A

By the way, in the above-mentioned Patent Document 1, if the power line is detached from the vehicle body frame when the support by the engine mount is released during a frontal collision of the vehicle, there is a possibility that the power line may be dropped from the vehicle body frame.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power line support structure capable of preventing a power line from falling off a vehicle body frame with a high probability during a frontal collision of a vehicle.

A power line support structure for solving the above problem is fixed to each of a pair of side frames extending in the front-rear direction of a vehicle, and a pair of mounts for supporting a power line located between the pair of side frames, and the power. The fall prevention member is provided on the pair of mounts through a space below the line, and a fastening member that fastens the fall prevention member to each of the pair of mounts. The fastening member is arranged along the up-and-down direction of the vehicle and fastens the drop-preventing member and the mount.

According to the above configuration, even if the power line is detached from the vehicle body frame due to the frontal collision of the vehicle, the power line can be supported by the detachment prevention member. At this time, the fall prevention member supports the power line that moves rearward of the vehicle with respect to the body frame. Therefore, since the fall prevention member has a strip-like shape whose width direction is set in the front-rear direction of the vehicle, it is possible to enhance mechanical strength against a load applied to the rear of the vehicle. As a result, the breakage of the fall prevention member due to the support of the power line is suppressed. Further, since the fastening member has a tensile strength larger than the shear strength, the fastening member for fastening the drop-prevention member and the mount extends along the up-down direction of the vehicle, so that the fastening is performed together with the support of the power line. The main stress generated in the member is the tensile stress. This makes it difficult for the fastening member to break. From the above, according to the above configuration, it is possible to prevent the power line from falling off with high probability.

In the above power line support structure, it is preferable that the fall prevention member has a plurality of bent portions that are convex toward the outside of the vehicle.
According to the above configuration, when the power line is supported, each bent portion of the drop-out preventing member expands due to elastic deformation, so that the shock can be absorbed. This makes it possible to prevent the power line from dropping off with a higher probability.

In the above power line support structure, the fall prevention member has a connecting member that is fastened to each of the mounts by a first fastening member that is the fastening member, and an end portion that is fastened to the connecting member. It is preferable to have a support member that passes through a space below the power line, and a plurality of second fastening members that fasten the connection member and the end portion of the support member.

According to the above configuration, for example, one of the plurality of second fastening members is broken, so that it is possible to absorb the shock accompanying the support of the power line. This makes it easier to maintain the state in which the drop-prevention member is bridged over the pair of side frames, so that the drop of the power line can be prevented with a higher probability.

In the support structure for the power line, the fall-prevention member is a portion that is fastened to the support body passing through a space below the power line by the second fastening member with respect to the connecting member, and is the support. It is preferable to have a supporting end portion wider than the main body portion.

According to the above configuration, since the supporting end portion has a shape wider than the supporting main body portion, it is possible to fasten the supporting member and the connecting member by using more second fastening members. .. This makes it possible to more firmly fasten the support member and the connecting member.

In the above power line support structure, it is preferable that a corner portion formed by the support main body portion and the support end portion has an R shape.
According to the above configuration, stress concentration is less likely to occur at the corner formed by the support main body and the support end along with the support of the power line. As a result, the support member is less likely to break starting from the connecting portion between the support main body portion and the support end portion.

(A) The side view which shows the schematic structure of one Embodiment of the support structure of a power line, (b) The sectional view which shows the cross-section structure in line 1b-1b. (A) The front view which shows the front structure of a rear mount, (b) The sectional view which shows the cross-section structure of the rear mount in 2b-2b. (A) The front view which shows the front structure of a connection member, (b) The side view which shows the side surface structure of a connection member. (A) The top view which shows the upper surface structure of a support member, (b) The front view which shows the front structure of a support member, (c) The top view which shows the planar structure of a support end part. The figure which shows typically the state which the fall prevention member supported the power line isolate|separated from the vehicle body frame.

An embodiment of a power line support structure will be described with reference to FIGS. 1 to 5.
As shown in FIGS. 1A and 1B, in a large vehicle such as a truck, an engine 12 and a transmission 13 are provided between a pair of left and right side frames 11 that form a vehicle body frame 10 as constituent elements. The power line 14 which it has is arranged. The power line 14 is fixed to each of the pair of side frames 11 and is supported by the pair of side frames 11 via a front mount 15 arranged in the width direction of the vehicle at a portion near the front of the vehicle. The power line 14 has a mount bracket 16 that extends toward the side of the vehicle at a position near the rear of the vehicle. The power line 14 is fixed to each of the pair of side frames 11 by a fixing member 17 such as a bolt, and the mount bracket 16 is fastened by a stud bolt 18 and a nut 19 to a rear mount 20 aligned in the vehicle width direction. As a result, it is supported by the pair of side frames 11. The mount bracket 16 is omitted in FIG.

To each of the rear mounts 20, a fall prevention member 30 that is bridged through a region below the power line 14 is connected by a first fastening member 31. The fall prevention member 30 prevents the power line 14 from dropping by supporting the power line 14 that has separated from the vehicle body frame 10 during a frontal collision of the vehicle. The captive prevention member 30 includes a pair of connecting members 32 connected to the rear mounts 20, a supporting member 41 bridged between the pair of connecting members 32, and a second fastening for connecting the connecting members 32 and the supporting member 41 together. And a member 42. The fall prevention member 30 has a strip-like shape whose width direction is set in the front-rear direction of the vehicle as a whole, and also has a left-right symmetrical shape with the vertical direction of the vehicle as an axis of symmetry.

Next, the rear mount 20 will be described with reference to FIG.
As shown in FIGS. 2A and 2B, the rear mount 20 has an outer bracket 21, an inner bracket 22, and a mount rubber 23. The outer bracket 21 is a portion fastened to the side frame 11. The inner bracket 22 is a portion to which the mount bracket 16 of the power line 14 is fastened. The mount rubber 23 is interposed between the outer bracket 21 and the inner bracket 22, and reduces vibrations from the power line 14 transmitted to the vehicle body frame 10 by elastic deformation.

The rear mount 20 is assembled by fitting an integrated inner bracket 22 and a mount rubber 23 into a fitting recess 25 formed in the outer bracket 21. After the rear mount 20 is aligned with the side frame 11, the rear mount 20 is fixed to the side frame 11 by fixing the fixing member 17 to the fixing fastening portion 26 formed on the back side of the outer bracket 21. To be done.

The outer bracket 21 has a pair of prevention material mounting portions 27 located inside the pair of side frames 11 when the rear mount 20 is fixed to the side frames 11. The pair of prevention material attachment portions 27 are arranged along the front-rear direction of the vehicle. A female screw portion 28 into which the first fastening member 31 is screwed is formed on each preventive material attaching portion 27. Each female screw portion 28 opens in the lower end surface of the preventive material mounting portion 27 and extends in the vertical direction of the vehicle.

The inner bracket 22 has a female screw portion 29 located inside the pair of side frames 11 in a state where the rear mount 20 is fixed to the side frames 11. The female screw portion 29 is a portion that opens in the upper end surface of the inner bracket 22 and extends in the vertical direction of the vehicle and into which the stud bolt 18 is screwed.

Next, the fall prevention member 30 will be described with reference to FIGS. 3 and 4. As described above, the fall prevention member 30 includes the connecting member 32, the support member 41, and the second fastening member 42.
As shown in FIGS. 3A and 3B, the connecting member 32 is composed of, for example, a bent steel plate 33 made of a high-tensile steel plate having high tensile strength, and a welding nut 34 welded to the bent steel plate 33. ing. Further, the bent steel plate 33 has a mount connecting portion 35, a connecting portion 36, and a supporting material connecting portion 37.

The mount connecting portion 35 is a portion connected to the rear mount 20. The mount connecting portion 35 has a substantially rectangular shape in a plan view with respect to the plate surface of the mount connecting portion 35, and has a pair of first insertion holes arranged in the longitudinal direction of the mount connecting portion 35 along the front-rear direction of the vehicle. 38 is formed. The first insertion hole 38 is a hole through which the first fastening member 31 for fastening the connecting member 32 to the prevention member attachment portion 27 of the outer bracket 21 is inserted.

The connecting portion 36 is a portion that connects the mount connecting portion 35 and the support material connecting portion 37. The connecting portion 36 is connected to the mount connecting portion 35 at a substantially right angle via a gentle R-shaped portion. The connecting portion 36 is connected to the supporting material connecting portion 37 on the opposite side of the mount connecting portion 35, and the supporting material connecting portion 37 is positioned such that the tip end portion of the supporting material connecting portion 37 is located inside the pair of side frames 11. It has a bent portion 39 for inclining 37 (see FIG. 2).

The support material connecting portion 37 is a portion to which the support member 41 is connected. The support material connecting portion 37 has a trapezoidal shape whose long side is a side near the connecting portion 36 in plan view facing the plate surface of the support material connecting portion 37. In the support material connecting portion 37, three welding nuts 34 are juxtaposed along the front-rear direction of the vehicle so as to be located inside the pair of first insertion holes 38 formed in the mount connecting portion 35. These welding nuts 34 are portions into which the second fastening member 42 that fastens the support member 41 and the connecting member 32 is screwed.

As shown in FIGS. 4A to 4C, the support member 41 is made of, for example, a high-tensile steel plate having a large tensile strength, and includes a support body portion 43 and a support end portion connected to the end portion of the support body portion 43. 44 and.

The support main body 43 has a strip shape whose width direction is set in the front-rear direction of the vehicle, and is formed in a polygonal shape by four bent portions 45 formed so as to project outward of the vehicle. ing. Due to these bent portions 45, a horizontal portion 46 extending along the width direction of the vehicle is formed in the support main body portion 43 as the lowermost portion of the fall prevention member 30. The horizontal portion 46 is set at a position where a predetermined ground clearance is secured and contact with the power line 14 that vibrates as the vehicle runs is avoided. The bending angle θ of each bent portion 45 is set to an obtuse angle, and the smallest bent angle θ1 is set to the bent portion 45 closest to each support end portion 44, that is, the pair of bent portions 45 located at the farthest positions. Is set. The bent portion 45 described above is preferably formed by bending.

The support end portion 44 is formed wider than the support main body portion 43, and has a substantially rectangular shape whose long sides are arranged along the front-rear direction of the vehicle. The support end portion 44 has a plurality of second insertion holes 47 through which the second fastening members 42 that fasten the support member 41 and the connecting member 32 are inserted. The second insertion hole 47 has an elongated hole shape whose longitudinal direction is set in the extending direction of the support member 41, that is, the direction orthogonal to the width direction of the support body 43. The corners of the support end 44 have a chamfered shape, the corners 48 formed by the support body 43 and the support end 44 are continuous with the chamfered corner, and the diameter is small near the support end 44. It is formed in a complex R shape (R1<R2). The second fastening member 42 preferably has a lower tensile strength than the connecting member 32 and the support member 41.

Next, an example of a method of assembling the power line 14 and the fall prevention member 30 and the like to the vehicle body frame 10 will be described. First, the front mount 15 and the rear mount 20 are fixed to each side frame 11. Then, after the power line 14 is arranged from above the vehicle body frame 10 to between the pair of side frames 11, the power line 14 is fixed to each front mount 15. Further, the mount bracket 16 of the power line 14 is fastened to each rear mount 20 by a stud bolt 18 and a nut 19. As a result, the power line 14 is assembled to the vehicle body frame 10. Next, the connection member 32 is fastened to each rear mount 20 by the first fastening member 31, and then the support end portion 44 of the support member 41 is fastened to the coupling member 32 by the second fastening member 42. At this time, it is preferable that the second fastening member 42 be fastened in a state where the second fastening member 42 is inserted into an end portion near the horizontal portion 46 in the second insertion hole 47 having a long hole shape. As a result, the fall prevention member 30 is assembled to the body frame 10.

According to the power line support structure of the above-described embodiment, the following operational effects can be obtained.
(1) As shown in FIG. 5, at the time of a frontal collision of the vehicle, the mount rubber 23 of the rear mount 20 together with the outer bracket 21 is broken along with breakage of the mount bracket 16, breakage of the stud bolt 18, and deformation of the mount bracket 16. The power line 14 is disengaged from the vehicle body frame 10 by being disengaged from the fitting recess 25 of the inner bracket 22. The power line 14 separated from the vehicle body frame 10 is supported by the fall prevention member 30 located below the power line 14.

(2) At this time, the fall prevention member 30 supports the power line 14 that moves rearward of the vehicle with respect to the body frame 10. Therefore, since the fall prevention member 30 has a strip-like shape whose width direction is set in the front-rear direction of the vehicle, it is possible to enhance mechanical strength against a load applied to the rear of the vehicle. This prevents breakage of the fall prevention member 30 when supporting the power line 14.

(3) Further, since the captive prevention member 30 has a strip shape whose width direction is set in the front-rear direction of the vehicle, the captive prevention member 30 has a strip shape whose width direction is set in the vertical direction of the vehicle. Compared with the case where it has a shape, the fall prevention member 30 has a higher degree of freedom with respect to the ground clearance. Therefore, for example, since the degree of freedom in the installation position of the power line 14 is improved, the fall prevention member 30 is less likely to be a harmful effect when lowering the center of gravity of the vehicle or the floor of the body.

(4) The fastening member has a tensile strength larger than a shear strength. Therefore, the first fastening member 31 that fastens the drop-off prevention member 30 and the rear mount 20 extends along the up-down direction of the vehicle, so that the first fastening member 31 is mainly generated along with the support of the power line 14. The stress becomes tensile stress. As a result, it is possible to prevent the power line 14 from falling off due to the breakage of the first fastening member 31.
(5) Due to the above (1), (2), and (4), the power line 14 can be prevented from falling off with a high probability.

(6) The support member 41 of the fall prevention member 30 has a plurality of bent portions 45 that are convex toward the outside of the vehicle. Therefore, when supporting the power line 14 detached from the vehicle body frame 10, the fall-off preventing member 30 can absorb the shock by the bending portion 45 extending due to elastic deformation. That is, since the support member 41 can function as a leaf spring material, the support member 41 can be made less likely to break. In addition, when the support member has an arc shape, it is necessary to process the entire material such as press working, but the bent portion 45 described above causes local bending such as bending using a bender or the like. It can be produced by processing. Further, the fall-off preventing member 30 supports the power line 14 between the bent portions 45 closest to the support end portions 44. Therefore, the smallest bending angle θ1 is set in the bending portion 45 closest to each supporting end portion 44, whereby the shock due to the elastic deformation of the bending portion 45 can be more reliably absorbed.

(7) The fall prevention member 30 includes a pair of connecting members 32 connected to the rear mount 20, a support member 41 bridged between the pair of connecting members 32, and a second connecting member 41 and the connecting member 32. And a fastening member 42. Therefore, shear stress is mainly generated in the second fastening member 42 as the power line 14 is supported. As a result, the impact due to the support of the power line 14 can be absorbed by the breakage of the second fastening member 42. As a result, the breakage of the fall-off prevention member 30 is suppressed, so that the drop-out of the power line 14 can be suppressed with a higher probability.

(8) Since the support end portion 44 of the support member 41 of the drop-off prevention member 30 is wider than the support main body portion 43, as compared with the case where the support main body portion 43 and the support end portion 44 have the same width, The support member 41 and the connecting member 32 can be fastened by using more fastening members. Thereby, the support member 41 can be more firmly fastened to the connecting member 32.

(9) Since the corner portion 48 formed by the support main body portion 43 and the support end portion 44 is R-shaped, stress concentration is less likely to occur at the corner portion 48 when supporting the power line 14. Therefore, the support member 41 is less likely to be broken starting from the connecting portion between the support body 43 and the support end 44.

(10) Moreover, the corner portion 48 has a compound R shape with a small diameter near the support end portion 44. As a result, the mechanical strength of the corner portion 48 is increased, so that stress concentration generated in the corner portion 48 can be further suppressed.

(11) The support member 41 of the fall prevention member 30 has the horizontal portion 46 as the lowermost portion. Therefore, as compared with the case where the lowermost portion of the support member 41 located at the same height is the bent portion 45, for example, the lowermost region in the region surrounded by the support member 41 can be increased in the vehicle width direction. As a result, the degree of freedom with respect to the installation position of the power line 14 is improved, so that the fall prevention member 30 is less likely to become an adverse effect when the center of gravity of the vehicle or the floor of the body is lowered.

(12) The second insertion hole 47 has a long hole shape that is long in the extending direction of the support body 43. As a result, the support member 41 and the connecting member 32 can be displaced within the range in which the second fastening member 42 is inserted into the second insertion hole 47. Therefore, the fall-off prevention member 30 can absorb the shock accompanying the support of the power line 14 due to the displacement of the connecting member 32 and the support member 41 that are fastened by the second fastening member 42. This makes it possible to prevent the power line 14 from dropping off with a higher probability. In addition, the workability of attaching the support member 41 to the connecting member 32 can be further improved.

(13) As shown in FIG. 3A, the fastening position of the first fastening member 31 is located outside the fastening position of the second fastening member 42 in the front-rear direction of the vehicle. Thereby, compared with the case where the fastening position of the first fastening member 31 is located inside the fastening position of the second fastening member 42, the load accompanying the support of the power line 14 is applied to the first fastening member 31 and the second fastening member. It can be efficiently dispersed in both members 42.

(14) The connecting member 32 has a bent portion 39 that inclines the support material connecting portion 37 so that the tip end portion of the support material connecting portion 37 is located inside the pair of side frames 11 with respect to the connecting portion 36. ing. Therefore, the impact due to the support of the power line 14 can be absorbed by the elastic deformation of the bent portion 39. As a result, the power line 14 can be prevented from falling off due to the breakage of the connecting member 32.

(15) In the connecting member 32, the support material connecting portion 37 has a trapezoidal shape whose long side is the side near the mount connecting portion 35. Therefore, stress concentration due to the support of the power line 14 is less likely to occur at the boundary between the support material connecting portion 37 and the connecting portion 36. As a result, the power line 14 can be prevented from falling off due to the breakage of the connecting member 32.

In addition, the above-described embodiment can be implemented with appropriate modifications as follows.
In the support member 41, the corner portion 48 formed by the support main body portion 43 and the support end portion 44 is not limited to the complex R shape, and may be an R shape having a single diameter or a chamfered shape. It may be. Further, the corner portion 48 may have a bent shape instead of the R shape or the chamfered shape.

In the support member 41, the support body 43 and the support end 44 may have the same width.
The fall prevention member 30 may have a configuration in which the support member 41 is connected to the rear mount 20 by the first fastening member 31.

The fall prevention member 30 may have an arcuate shape without the bent portion 45. Further, the fall prevention member 30 may have more bent portions 45 than in the above embodiment. The more bent portions 45, the easier the energy is absorbed by the elastic deformation of the bent portions 45.
Further, the bending angle θ of the bending portion 45 can be changed according to the specifications at each time.

The first fastening member 31 has only to fasten the rear mount 20 and the fall prevention member 30, and the fastening position and the number of fastenings are not limited to those in the above embodiment. Therefore, the fastening position by the first fastening member 31 may be inside the fastening position by the second fastening member 42 in the front-rear direction of the vehicle.

The support member 41 and the connecting member 32 may be fastened at the plurality of second fastening members 42, and may be fastened at two locations or at four or more locations.
The second insertion hole 47 is not limited to the elongated hole shape and may be circular.
The support structure described above may be applied not only to the rear mount 20 but also to the front mount 15.

Next, the technical idea understood from the above-described embodiment will be added.
(Appendix 1)
The power line support structure according to claim 2, wherein the captive prevention member has a horizontal portion that extends in the vehicle width direction as a lowermost portion.

With this configuration, for example, the lowermost region in the region surrounded by the captive prevention member can be increased in the width direction of the vehicle as compared with the case where the lowermost portions located at the same height are the bent portions. As a result, the degree of freedom with respect to the installation position of the power line is improved, so that the fall-out prevention member is less likely to become an adverse effect when the center of gravity of the vehicle or the floor of the body is lowered.

(Appendix 2)
The support structure for a power line according to claim 3, wherein the support member has an insertion hole through which the second fastening member is inserted, and the insertion hole has a long hole shape elongated in the extending direction of the support member. ..

According to this structure, the support member and the connecting member can be displaced within the range in which the second fastening member is inserted into the insertion hole. Therefore, it is possible to absorb the shock accompanying the support of the power line by the displacement of the connecting member and the supporting member in the state of being fastened by the second fastening member. This makes it possible to prevent the power line from dropping off with a higher probability.

(Appendix 3)
The mount and the connecting member are fastened by a pair of the first fastening members arranged in the front-rear direction of the vehicle, and the fastening position of the first fastening member is relative to the fastening positions of the plurality of second fastening members. The power line support structure according to claim 3 or claim 2, wherein the power line support structure is located outside of the vehicle in the front-rear direction.
According to the above configuration, the load accompanying the support of the power line can be efficiently dispersed to both the first fastening member and the second fastening member.

(Appendix 4)
The support structure for a power line according to claim 5, wherein the corner portion has a compound R shape having a small diameter in a portion near the support end portion.
According to the above configuration, since the mechanical strength of the corner portion is increased, it is possible to further suppress the stress concentration generated at the corner portion when the power line is supported.

10... Body frame, 11... Side frame, 12... Engine, 13... Transmission, 14... Power line, 15... Front mount, 16... Mounting bracket, 17... Fixing member, 18... Stud bolt, 19... Nut, 20... Rear Mount, 21... Outer bracket, 22... Inner bracket, 23... Mount rubber, 25... Fitting recess, 26... Fixing fastening part, 27... Preventing material mounting part, 28, 29... Female screw part, 30... Fall prevention member, 31... 1st fastening member, 32... Connection member, 33... Bending steel plate, 34... Weld nut, 35... Mount connection part, 36... Connection part, 37... Support material connection part, 38... First insertion hole, 39... Bend Reference numeral 41, support member 42, second fastening member 43, support main body portion 44, support end portion 45, bent portion 46, horizontal portion 47, second insertion hole 48, corner portion.

Claims (3)

A pair of mounts that are fixed to each of a pair of side frames extending in the front-rear direction of the vehicle and that support a power line located between the pair of side frames,
A fall prevention member bridged over the pair of mounts through a space below the power line,
A first fastening member that fastens the fall prevention member to each of the pair of mounts,
The fall prevention member has a strip-like shape whose width direction is set in the front-rear direction of the vehicle,
The first fastening member is arranged along the up-down direction of the vehicle and fastens the drop-off prevention member and the mount ,
The fall prevention member includes a connecting member that is fastened to each of the mounts by the first fastening member, and a support member that has an end portion that is fastened to the connecting member and that passes through a space below the power line. A plurality of second fastening members that fasten the connecting member and the end portion of the support member,
The support member is a power line support structure having a plurality of bent portions that are convex toward the outside of the vehicle . The support member is a support body portion that passes through a space below the power line, and a support end portion that is a portion fastened to the connecting member by the second fastening member and that is wider than the support body portion. The power line support structure according to claim 1 , further comprising: The support structure for a power line according to claim 2 , wherein a corner portion formed by the support main body portion and the support end portion has an R shape.