JP5518658B2 - Mounting method for reinforcing member for bodywork and mounting structure for reinforcing member for bodywork - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a mounting member mounting method and a mounting member mounting structure for reinforcing necessary for retrofitting a work machine such as a vehicle-mounted crane to a chassis frame of a vehicle such as a truck.

In general, a chassis frame of a vehicle such as a truck has a U-shaped cross section, and a chassis frame hole for attaching equipment and the like is formed through the outer surface in the vehicle width direction. In a vehicle-mounted crane mounted on this type of vehicle, the crane is mounted on the chassis frame (see, for example, Patent Document 1).
At this time, as shown in FIG. 6, in order to increase the strength of the chassis frame 3, the U-shaped chassis frame 3 is provided with reinforcing members 125 and 135 having an L-shaped cross section and long in the vehicle front-rear direction. It is arranged above and below. Then, the upper and lower reinforcing members 125 and 135 are fillet welded W1 to the chassis frame 3, respectively, and large holes 125d and 135d are provided on the surface contacting the side surface portion of the chassis frame 3, and the holes 125d and 135d are circular. The slot welding W2 is performed at a plurality of locations.

  By the way, when a load is suspended by a crane, the chassis frame is deflected by a suspended load moment generated by the suspension operation. At this time, if welding is performed on the upper and lower surfaces of the chassis frame having the largest moment of inertia in the cross section, breakage is likely to occur from the weld due to strain. Therefore, in order to maintain the strength of the chassis frame, welding is not performed on the upper and lower surfaces of the chassis frame and in the vicinity thereof.

Published Utility Model No. 4-74183

However, in recent years, the number of chassis frame holes formed on the outer surface of the chassis frame in the vehicle width direction has been increased in order to facilitate the mounting of equipment. Therefore, for such a chassis frame, the weld leg length of the reinforcing member for bodywork may not be sufficiently secured. In other words, there is a possibility that the welding strength cannot be maintained with the conventional mounting structure for reinforcing members for bodywork. In addition, some foreign truck vehicle manufacturers have totally prohibited welding to the chassis frame, even to reinforce the work machines when retrofitting.
Therefore, as another mounting structure, it is also conceivable to attach the reinforcing member to the chassis frame with a number of bolts or the like without fixing the chassis frame and the reinforcing member by welding.

  However, a large number of bolt holes for mounting the reinforcing member must be drilled at positions avoiding the existing chassis frame holes, with respect to the chassis frame having more chassis frame holes than before. . Therefore, it is difficult to align the numerous bolt holes in the reinforcing member that is long in the longitudinal direction of the vehicle. Further, the conventional two upper and lower reinforcing members 125 and 135 as shown in FIG. 6 are fixed separately and do not necessarily constitute an integral rigid body. For this reason, when bolts are tightened instead of welding, an unreasonable shearing force is applied to some of the bolts when the crane is suspended. In order to prevent unexpected breakage due to this, there is a problem that a corresponding bolt diameter is required.

  Furthermore, as a matter of caution in attaching the reinforcing member, there should be no gap between the reinforcing member and the upper or lower surface of the chassis frame. If such a gap is generated, the section modulus is lower than the calculated value, and the reinforcing member may be broken without maintaining the required strength. Therefore, there is also a problem that the number and position of bolts necessary to prevent such a gap from being generated must be drilled according to the limitations of the existing chassis frame holes.

  Therefore, the present invention has been made paying attention to such problems, and can attach a reinforcing member without directly welding the chassis frame while maintaining a strength equal to or higher than that of a conventional reinforcing member. It is another object of the present invention to provide a method for attaching a reinforcing member for bodywork and a structure for attaching a reinforcing member for bodywork.

  In order to solve the above-mentioned problems, the first invention of the present invention is used to reinforce a work machine on a chassis frame of a vehicle and has a U-shaped cross section. A mounting method of a reinforcing member for bodywork to be mounted on a chassis frame having a chassis frame hole penetratingly formed on an outer side surface in the vehicle width direction, the mounting method being mounted on the outer surface of the chassis frame, and the chassis frame hole A plurality of auxiliary plates having bolt fastening mounting holes formed at opposite positions, and a pair of reinforcing member main bodies arranged so as to sandwich the chassis frame from above and below the vehicle and having an L-shaped cross section. A plurality of auxiliary plates are attached to the outer surface in the vehicle width direction along the longitudinal direction of the chassis frame by bolt fastening using the mounting holes and the chassis frame holes. After the plate mounting step, the auxiliary plate mounting step, the pair of reinforcing member main bodies are arranged so as to sandwich the chassis frame from above and below the vehicle, and the vehicle width after the reinforcing member mounting step. A welding step of welding the auxiliary plate and the pair of reinforcing member bodies only on the outer side surface in the direction.

  The second aspect of the present invention is used to reinforce a work machine mounted on a chassis frame of a vehicle. The second aspect of the present invention has a U-shaped cross section and is outside the vehicle width direction. A structure for attaching a reinforcement member for a body mounted on a chassis frame in which a chassis frame hole is formed in a side surface. The structure is mounted on an outer surface of the chassis frame and formed at a position opposite to the chassis frame hole. A reinforcing member comprising a plurality of auxiliary plates having mounting holes for fastening bolts, and a pair of reinforcing member bodies arranged so as to sandwich the chassis frame from above and below the vehicle and having an L-shaped cross section; The plurality of auxiliary plates are mounted on the outer surface in the vehicle width direction along the longitudinal direction of the chassis frame by bolt fastening using the mounting holes and the chassis frame holes, and the pair of reinforcing member books Is arranged so as to sandwich the chassis frame from above and below the vehicle, and the auxiliary plate and the pair of reinforcing member main bodies are arranged on the outer side surface in the vehicle width direction with the auxiliary plate and the pair of reinforcing member main bodies. It is characterized by being welded to each other only.

  According to the present invention, only a pair of reinforcing member bodies above and below the chassis frame and the auxiliary plate are fixed by welding, so that an integrated rigid body can be formed after fixing without performing welding to the chassis frame. According to the present invention, the chassis frame is not subjected to the deflection of the chassis frame caused by the work machine work (for example, the suspension work of the suspended load in the case of a crane) by the bolt that fixes the auxiliary plate. It can be supported by the upper and lower contact surfaces of the upper and lower reinforcing member bodies and the chassis frame. As a result, it is possible to attach the reinforcing member without directly welding the chassis frame while maintaining the strength equal to or higher than that of the conventional reinforcing member.

1 is a front view of a vehicle-equipped crane-equipped vehicle according to an embodiment of a work machine that employs a reinforcement member for bodywork according to the present invention. It is an enlarged view of the principal part (reinforcement member attachment structure part) of FIG. It is AA sectional drawing in FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is an exploded view explaining the reinforcement member main body and auxiliary | assistant board which comprise the reinforcement member for mounting based on this invention, The figure (a) is the front view, (b) is a right view of (a). It is a figure which expands and shows the principal part of FIG. It is a figure explaining the attachment structure of the conventional reinforcement member for bodywork, Comprising: The figure (a) is the front view, (b) is BB sectional drawing in (a).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, the vehicle-equipped crane-equipped vehicle 1 has a loading platform 5 on a chassis frame 3 behind the host vehicle. A torii gate 5a is attached to the front end portion of the loading platform 5 to prevent contact with members on the cab 1a side such as cargo loaded on the loading platform 5. A vehicle-mounted crane (hereinafter simply referred to as “crane”) 20 is mounted as a work machine between the torii 5a and the cab 1a.

  The crane 20 has a base 4 mounted horizontally on a chassis frame 3 of the vehicle. A pair of outriggers 2 are attached to the base 4 so as to project to the left and right. Further, a column 6 is erected on the base 4 so as to be able to turn by driving a turning hydraulic motor 5. A boom 7 is provided at the upper end of the column 6 so that it can be raised and lowered by the operation of the boom expansion / contraction hydraulic cylinder 8 and the boom raising / lowering hydraulic cylinder 9.

  The column 6 is provided with a winch 11 that can be driven by a winch hydraulic motor 10. A wire rope 12 is led from the winch 11 to the tip 7 s of the boom 7, and the sheave of the tip 7 s of the boom 7 is guided. The wire rope 12 is wound around the hook 13 via the winch 11 and is wound up and down by the winch 11. As shown in the figure, the vehicle-equipped crane-equipped vehicle 1 has a specification in which the boom 7 of the crane 20 is stored in a posture toward the loading platform 5 and the hook 13 is stored on the boom 7 side by a storage device. It is.

  Here, as described above, the base 4 of the crane 20 is mounted horizontally on the chassis frame 3, but as shown in FIG. In order to increase the strength of the chassis frame 3, the reinforcement member 30 for mounting according to the present invention is employed, and the base 4 is horizontally mounted on the chassis frame 3 via the reinforcement member 30 for mounting. The chassis frame 3 of the vehicle-equipped crane-equipped vehicle 1 has a U-shaped cross section and a chassis frame hole 3a for mounting equipment on the outer surface in the vehicle width direction (see FIG. 3). ) Are formed through.

Hereinafter, the reinforcing member 30 for bodywork, its mounting method, and mounting structure will be described in detail with reference to FIGS. 2 is an enlarged view of the mounting portion of the reinforcing member, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is an exploded view illustrating the reinforcing member and the auxiliary plate according to the present invention. In the figure, (a) is a front view and (b) is a right side view.
As shown in the enlarged view of the main part in FIG. 2, the reinforcement member 30 for bodywork includes a plurality of auxiliary plates 31 (six in this example) and a pair of L-shaped cross sections (see FIG. 3). The reinforcing member bodies 25 and 35 are mounted on the chassis frame 3 having a U-shape from the outer side in the vehicle width direction.

  Specifically, the auxiliary plate 31 constituting the reinforcement member 30 for bodywork is a rectangular plate member having chamfered corners as shown in FIG. The size of the rectangular shape (dimension in the vehicle vertical direction) is the size (dimension in the vehicle vertical direction) of the vehicle frame direction outer surface portion of the chassis frame 3 having a U-shaped cross section (see FIG. 4B). ) Is slightly smaller than. Here, the dimension of the auxiliary plate 31 in the longitudinal direction of the vehicle is, as shown in FIG. 2, a single plate structure elongated in the longitudinal direction of the vehicle, such as the reinforcing member bodies 25 and 35 arranged vertically. Instead, a plurality of pieces (six pieces in this example) have a short divided structure that can be attached to the outer side surface in the vehicle width direction along the longitudinal direction of the chassis frame 3 with a predetermined gap. When the auxiliary plate 31 has such a divided structure, it is suitable for absorbing the deflection of the chassis frame 3 generated during the hanging work of the crane 20 by the gap between the adjacent auxiliary plates 31. . The auxiliary plate 31 is attached to the outer surface of the chassis frame 3 in the vehicle width direction by bolts and nuts 32.

  Further, the auxiliary plate 31 has a mounting hole 31d formed at a position facing the chassis frame hole 3a. Here, when attaching the auxiliary plate 31 to the chassis frame 3, the chassis frame hole 3a is obtained by obtaining in advance data describing the drill position of the chassis frame 3 and the chassis frame hole 3a from the vehicle manufacturer. A mounting hole 31d can be opened in advance. In addition, it is preferable to use the existing chassis frame hole 3a opened at the upper and lower ends of the chassis frame 3 as much as possible for the formation position of the mounting hole 31d. With such a configuration, the mounting distance between the center of the bolt / nut 32 and the upper and lower surfaces of the chassis frame 3 can be minimized. For this reason, it is possible to efficiently suppress the force for peeling the reinforcing member 30 from the chassis frame 3 when the deflection is caused by the crane work.

  Interferences such as wiring clamps and hydraulic pipe mounting bolts protrude from the side surface of the chassis frame 3 when the auxiliary plate 31 is manufactured to deal with a vehicle that produces only a small number of units. An object may interfere with the auxiliary plate 31. In such a case, when the auxiliary plate 31 is attached, an avoidance hole that avoids interference with the attachment hole 31d and the interference is drilled on the spot.

  In addition, the size of each side of the rectangular shape of the auxiliary plate 31 is about 3 to 5 mounting bolts in consideration of the case of drilling in accordance with the existing chassis frame hole 3a of the chassis frame 3 described above. Select a size that can be installed using as a guide. Thereby, the merit that easiness of attachment and the processing accuracy of the bolt holes (such as the pitch distance between the bolt holes) is improved also occurs.

  Next, as shown in FIGS. 2 to 4, the reinforcing member main bodies 25 and 35 constituting the body reinforcing member 30 are L-shaped so as to sandwich the U-shaped chassis frame 3 from above and below. This is a pair of reinforcing members. The reinforcing member bodies 25 and 35 have a single-plate structure that is long in the vehicle front-rear direction, and the L-shaped direction is such that the U-shaped chassis frame 3 is covered without gaps from the outer side in the vehicle width direction. Is bent. In addition, the corner | angular part of the front-and-rear end of the surface contact | abutted to the vehicle width direction outer side surface of each reinforcement member main body 25 and 35 is chamfered by the large inclined surfaces 25s and 35s.

  And also in the attachment of the reinforcing member bodies 25 and 35, based on the data in which the hole position of the chassis frame hole 3a is previously recorded, the welding attachment holes 25d and 35d are formed at the opposite positions in accordance with the chassis frame hole 3a. Open in advance. The sizes (inner diameters) of the welding mounting holes 25d and 35d are larger than the mounting holes 31d so as not to interfere with the fastening operation of the bolts and nuts 32, and are suitable for performing circular slot welding W2. .

  However, similar to the above, the holes 25d and 35d for welding mounting need to be drilled with gas or the like at the time of mounting depending on the presence or absence of interference on the surface of the small-scale production vehicle or the chassis frame. is there. Even in this case, the welding attachment holes 25d and 35d are attachment holes for circular slot welding W2 for welding attachment to the auxiliary plate 31, so that unlike the case of drilling the auxiliary plate 31, the reinforcing member body 25 As the drilling accuracy of the welding mounting holes 25d and 35d, the precision of the bolt mounting pitch is not necessary. In addition to the gas hole machining, the welding attachment holes 25d and 35d may be machined on the spot at the time of attachment using a tool called a puncher.

Next, the mounting method of the above-mentioned reinforcement member 30 for bodywork and the reinforcement member attachment structure for body formation formed by this will be described with reference to FIGS. 2 to 5 as appropriate.
First, when mounting the reinforcing member 30 for bodywork, the number of auxiliary plates 31 to be used and the position of each auxiliary plate 31 with respect to the side surface of the chassis frame 3 are determined. The number and position of the auxiliary plates 31 are adjusted so that the auxiliary plate 31 is positioned on the outer side in the vehicle width direction according to the fixing position of the upper reinforcing member main body 25 and the lower reinforcing member main body 35 and the longitudinal range of the chassis frame 3. Decide the position and the number to hit.

  At this time, the upper side surface and the lower side surface of the rectangular auxiliary plate 31 are bent shoulder inner sides (L-shaped inner side) forming an R shape of the upper reinforcing member main body 25 or the lower reinforcing member main body 35. Be careful not to interfere with corner K) (see FIG. 3). This is because interference with the shoulder portion inner side K may cause a gap between the upper and lower reinforcing member bodies 25 and 35 and the upper and lower surfaces of the chassis frame 3, and a desired strength may not be obtained.

Next, the mounting hole 31 d of the auxiliary plate 31 is aligned with the chassis frame hole 3 a that is an existing hole of the chassis frame 3. If the positions of the holes do not match, the attachment holes 31d are reopened on the auxiliary plate side. In addition, a wiring clamp, a hydraulic pipe mounting bolt, or the like may protrude from the surface of the side surface of the chassis frame 3. When these interfere with the auxiliary plate 31, an avoidance hole for avoiding interference is provided in the auxiliary plate 31 during the auxiliary plate mounting preparation process.
Then, the aligned auxiliary plate 31 and chassis frame 3 are fastened using bolts and nuts 32. That is, the bolt 32a is inserted from the vehicle width direction outer surface side of the auxiliary plate 31, and is fixed by the nut 32b from the inner side of the chassis frame 3 (auxiliary plate mounting step) (see FIGS. 3 and 4B).

Next, after the auxiliary plate mounting step, the upper reinforcing member main body 25 and the lower reinforcing member main body 35 are aligned to determine a welding location with the auxiliary plate 31 (reinforcing member arranging step). If there is an interference with the mounting bolt 32a of the auxiliary plate 31 or an interference such as a protrusion of the chassis frame 3, the welding mounting holes 25d and 35d are reopened appropriately so as to avoid the interference.
Next, after the reinforcing member arranging step, the welding attachment holes 25d and 35d on the side surfaces of the upper and lower reinforcing member bodies 25 are fixed to the auxiliary plate 31 by circular slot welding W2 without welding to the chassis frame 3. Then, the end portions of the upper and lower reinforcing member bodies 25 and 35 and the auxiliary plate 31 are fixed by fillet welding W1 (welding process) (see FIGS. 2 and 5). As a result, according to the mounting member mounting structure for mounting, the auxiliary plate 31 and the pair of upper and lower reinforcing member bodies 25 and 35 are fixed by welding, so that the mounting reinforcing member 30 after fixing forms an integrated rigid body. .

Next, a procedure for laying the crane 20 on the vehicle 1 equipped with the post-fixing mounting reinforcing member 30 will be described with reference to FIGS.
First, as shown in FIGS. 2 to 3, the base 4 is placed on the upper reinforcing member body 25 in accordance with the position where the crane 20 is fixed, and the upper reinforcing plate body 25 and the base 4 are placed. It is fixed by welding. Next, the bolt bracket 24 is fixed to the pair of reinforcing member bodies 25 and 35 by welding in accordance with the position of the bolts 22 for fixing the crane. Bolt brackets 24 are provided at a total of four locations on the vehicle front, rear, left and right. Next, the crane 20 is placed on the base 4, and finally, a total of four bolt brackets 24 and the crane 20 are fixed by four bolts 22 and nuts 23.

Next, a method of attaching the above-described reinforcement member 30 for bodywork and an operation / effect of the attachment structure will be described.
As described above, the mounting method and the mounting structure of the reinforcing member 30 for the body are fixed to the chassis frame 3 by welding only to the reinforcing member bodies 25 and 35 on the upper and lower portions of the chassis frame 3 and the auxiliary plate 31. After fixing without welding, the reinforcing member 30 for bodywork can be formed as an integrated rigid body. And if it is such a structure, the deflection | deviation of the chassis frame 3 which generate | occur | produces at the time of suspension work of the load of the crane 20 by it will not receive with the volt | bolt 32a which fixes the auxiliary | assistant board 31, but the upper and lower sides of the chassis frame 3 will be received. It can be supported by the upper and lower contact surfaces of the reinforcing member bodies 25 and 35 and the chassis frame 3. Accordingly, the reinforcing member can be attached without directly welding the chassis frame 3 while maintaining the strength equal to or higher than that of the conventional reinforcing member. In other words, compared to the conventional case where the reinforcing member is directly bolted to the chassis frame, an excessive shearing force is not applied to the bolt 32a, so that the number of bolts 32a can be reduced and the bolt diameter can be reduced. There is no need to be thick.

  In addition, according to the mounting method and mounting structure of the reinforcement member 30 for the bodywork, the auxiliary plate 31 is divided into a small rectangular shape, so that it is necessary to perform additional drilling on the auxiliary plate 31 itself. Even so, the size can be easily handled. Therefore, it is suitable for improving the processing accuracy of the mounting holes 31d for the bolts 32a and the pitch distance between the mounting holes 31d.

Further, according to the mounting method and the mounting structure of the reinforcement member 30 for bodywork, a plurality of auxiliary plates 31 are used and a gap is provided between the adjacent auxiliary plates 31. Therefore, the chassis frame generated during crane work This is suitable for absorbing the deflection of 3.
Further, according to the mounting method and the mounting structure of the reinforcement member 30 for the bodywork, the mounting bolt 32a of the auxiliary plate 31 is as close as possible to the upper side above the chassis frame 3 and the lower side is below the chassis frame 3. Therefore, it is suitable for producing an effect of suppressing the force in the direction in which the auxiliary plate 31 is peeled off from the chassis frame 3.

The mounting member mounting structure for bodywork according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, a vehicle-mounted crane has been described as an example of a work machine. However, the present invention is not limited to this, and can be applied to various work machines. A vehicle can also be operated on a chassis frame of the vehicle. Needless to say, the present invention can be applied to various vehicles as long as it is used for reinforcement required when retrofitting a machine.

1 Vehicle with vehicle-mounted crane (vehicle)
2 Outrigger 3 Chassis frame 4 Base 5 Loading platform 6 Column 7 Boom 8 Boom telescopic hydraulic cylinder 9 Boom hoisting hydraulic cylinder 10 Winch hydraulic motor 11 Winch 12 Wire rope 13 Hook 20 Vehicle-mounted crane (work machine)
22 (For crane fixing) Bolt 23 (For crane fixing) Nut 24 Bolt bracket 25 (Upper) Reinforcing member body 30 Reinforcing member 31 Auxiliary plate 32 (Auxiliary plate fixing) Bolt / Nut 35 (Lower) Reinforcing member body W1 Fillet welding W2 slot welding

Claims (2)

A chassis that is used to reinforce a work machine on a chassis frame of a vehicle, has a U-shaped cross section, and has a chassis frame hole formed through the outer side in the vehicle width direction. A mounting method for a reinforcement member for bodywork to be mounted on a frame,
A plurality of auxiliary plates mounted on the outer surface of the chassis frame and having mounting holes for fastening bolts formed at positions opposed to the chassis frame holes, and the chassis frame are arranged so as to be sandwiched from above and below the vehicle. A reinforcing member composed of a pair of reinforcing member bodies having a L-shaped cross section,
Auxiliary plate mounting step of mounting the plurality of auxiliary plates on the outer side surface in the vehicle width direction along the longitudinal direction of the chassis frame by bolting using the mounting holes and the chassis frame holes, and after the auxiliary plate mounting step, A reinforcing member disposing step of sandwiching the pair of reinforcing member main bodies so as to sandwich the chassis frame from above and below the vehicle; and after the reinforcing member disposing step, the auxiliary plate and the pair of reinforcing members on the outer surface in the vehicle width direction A mounting method for a reinforcement member for bodywork, comprising: a welding step of welding the members only to each other. A chassis that is used to reinforce a work machine on a chassis frame of a vehicle, has a U-shaped cross section, and has a chassis frame hole formed through the outer side in the vehicle width direction. It is a reinforcing member mounting structure for bodywork to be mounted on a frame,
A plurality of auxiliary plates mounted on the outer surface of the chassis frame and having mounting holes for fastening bolts formed at positions opposed to the chassis frame holes, and the chassis frame are arranged so as to be sandwiched from above and below the vehicle. A reinforcing member comprising a pair of reinforcing member main bodies having a L-shaped cross section,
The plurality of auxiliary plates are attached to the outer surface in the vehicle width direction along the longitudinal direction of the chassis frame by bolting using the mounting holes and the chassis frame holes, and the pair of reinforcing member bodies are configured to attach the chassis frames. The auxiliary plate and the pair of reinforcing member main bodies are disposed so as to be sandwiched from above and below the vehicle, and the auxiliary plate and the pair of reinforcing member main bodies are welded to each other only on the auxiliary plate and the pair of reinforcing member main bodies on the outer surface in the vehicle width direction. A structure for mounting reinforcing members for bodywork, wherein

Images