JP6561708B2 - Work vehicle frame - Google Patents

Description

  The present invention relates to a work vehicle frame used as a carrier frame of a work vehicle such as a mobile crane.

  Conventionally, as this type of work vehicle frame, there are a connecting portion where a working device such as a crane device is connected to an upper surface at a predetermined position in the front-rear direction, and an outrigger arm that is juxtaposed in the front-rear direction below the front of the connecting portion A carrier frame has a pair of outrigger boxes that are movably supported in the width direction, an engine is mounted in front of the pair of outrigger boxes, and a transmission is mounted between the pair of outrigger boxes and the engine. ing.

  The carrier frame has a pair of left and right side members extending in the front-rear direction at an interval in the width direction, a cross member connecting the pair of side members to each other, and an opening formed in a portion where the engine and the transmission are attached. And an upper plate provided on the upper side of the side member.

  The carrier frame forms a box structure by at least a pair of side members, a cross member, and an upper plate, thereby obtaining rigidity capable of suppressing bending and twisting due to a reaction force acting on the outrigger box.

  The carrier frame can obtain the required rigidity when the cross member is arranged along the front end of the front outrigger box, but the rear end of the opening of the upper plate is located at the front end of the front outrigger box. Therefore, it is not possible to secure a sufficient maintenance space for performing the attachment / detachment work of the transmission from above the opening.

  In addition, when the cross member is arranged behind the front end portion of the front outrigger box, the carrier frame has the rear end portion of the opening of the upper plate arranged behind the front end portion of the front outrigger box. Although the maintenance space can be increased, it is not possible to sufficiently suppress the bending and twisting of the carrier frame due to the reaction force acting on the front outrigger box.

  Therefore, as a carrier frame capable of obtaining necessary rigidity and securing a maintenance space, between the pair of side members, the front end portion on the side where the outrigger arm in the front outrigger box projects and the rear side It is conceivable that the opening of the upper plate is partially enlarged rearward in the width direction by arranging the cross member so as to extend obliquely between the front end of the outrigger box where the outrigger arm projects. (For example, refer to Patent Document 1).

Japanese Patent No. 5091582

  In the carrier frame in which the cross members are arranged obliquely, the opening of the upper plate is partially formed in the width direction, but a larger maintenance space is required. Further, in the carrier frame in which the cross members are arranged obliquely, it is not easy to join the side members and the cross members by welding, and it is not easy to ensure the dimensional accuracy after assembly.

  An object of the present invention is to provide a work vehicle frame capable of obtaining necessary rigidity and securing a maintenance space.

In order to achieve the above object, the present invention provides a connecting portion in which a work device is connected to an upper surface at a predetermined position in the front-rear direction, and an outrigger arm that is arranged in the front-rear direction at the front lower portion of the connecting portion and can be raised and lowered in the width direction A pair of left and right sides that extend in the front-rear direction at intervals in the width direction. The member and the front-rear position are the front end of the rear outrigger box, and are provided on the upper part of the pair of side members, excluding the cross member that connects the pair of side members to each other, and the part to which the engine and transmission are attached. On the side where the outrigger arm in the front upper plate and the outrigger box on the front side protrude. And a reinforcing portion for members and a front outrigger box to reinforce the inside in the width direction of the intersection, the lower ends of the pair of side members, extends in the front-rear direction, the lower plate is provided extending in the width direction A first reinforcing member extending forward from the cross member at a distance from the side member on the inner side in the width direction of the side member located on the side where the outrigger arm projects in the front outrigger box, and a side member in front of the cross member And a second reinforcing member that connects the first reinforcing member, and the reinforcing portion is disposed above the front outrigger box on the front side, a side member, a cross member, a first reinforcing member, a second reinforcing member, an upper plate, Ru box structure der formed by the lower plate.
In order to achieve the above object, the present invention provides a connecting portion in which the work device is connected to the upper surface at a predetermined position in the front-rear direction, and an outrigger arm arranged in the front-rear direction at the front lower portion of the connecting portion in the width direction. And a pair of left and right working vehicle frames, wherein the engine and the transmission are mounted in front of the pair of outrigger boxes, and extend in the front-rear direction at intervals in the width direction. The front member of the rear outrigger box is located at the front and rear direction of the rear member, and the upper part of the pair of side members excluding the cross member that connects the pair of side members to each other and the part to which the engine and transmission are attached. Located on the side where the upper plate provided and the outrigger arm in the front outrigger box protrude A reinforcing portion that reinforces the inner side in the width direction of the portion where the side member and the front outrigger box intersect, and the side member positioned in the width direction inner side of the side member positioned on the side where the outrigger arm projects in the front outrigger box A first reinforcing member extending forward from the cross member at a distance from the member; and a second reinforcing member connecting the side member and the first reinforcing member in front of the cross member, the reinforcing portion being a side member , A box structure formed by the upper surface of the cross member, the first reinforcing member, the second reinforcing member, the upper plate and the front outrigger box.

  As a result, the bending or twisting of the work vehicle frame more than a predetermined amount due to the reaction force acting on the front outrigger box is suppressed by the reinforcing portion provided on the inner side in the width direction of the side member, so that the rigidity is not lowered. The entire width direction from the front end portion of the rear outrigger box to the front width direction center can be used as an opening as a maintenance space.

  According to the present invention, since the entire width direction from the front end portion of the rear outrigger box to the front width direction center portion can be an opening as a maintenance space, work efficiency in maintenance work can be improved. It becomes.

It is a side view of the mobile crane which shows one Embodiment of this invention. It is a top view of a carrier frame. It is a bottom view of a carrier frame. It is a top view which shows the state which removed the upper board of the carrier frame. It is AA sectional drawing of FIG.

  1 to 5 show an embodiment of the present invention.

  As shown in FIG. 1, a mobile crane 1 having a work vehicle frame according to the present invention includes a vehicle body 10 for traveling in a general road or a work area, and a crane as a work device for performing crane work. The apparatus 20 is provided.

  The vehicle body 10 includes a carrier frame 100 (described later) extending in the front-rear direction, a traveling cab 11 for traveling operation provided on the front side of the carrier frame 100, and wheels provided on both sides in the width direction on the front side and the rear side of the carrier frame 100. 12, first to fourth outriggers 13, 14, 15, 16 (hereinafter referred to as 13 to 16) provided on both sides in the width direction on the front and rear sides of the crane device 20, and provided below the traveling cab 11. The front jack 17 is provided. The vehicle body 10 travels when the driving force of the engine E is transmitted to the wheels 12 via the transmission T.

  Here, although not shown, the first to fourth outriggers 13 to 16 are first to fourth outrigger boxes, and first to fourth outrigger arms provided so as to be able to protrude and retract from the first to fourth outrigger boxes, respectively. And first to fourth outrigger jacks fixed to the tip of the first to fourth outrigger arms. The first outrigger 13 is such that the first outrigger jack projects to the left in front of the crane device 20. The second outrigger 14 has a second outrigger jack that protrudes to the right in front of the crane device 20. The third outrigger 15 is such that the third outrigger jack projects to the left behind the crane device 20. The fourth outrigger 16 has a fourth outrigger jack that protrudes to the right behind the crane device 20.

  The crane device 20 is provided on a swivel base 21 that can turn in the horizontal direction with respect to the vehicle body 10, a crane cab 22 for crane operation provided on one side in the width direction of the swivel base 21, and on the other side in the width direction of the swivel base 21. A telescopic boom 23 that can be raised and lowered with respect to the swivel base 21, a wire rope 24 that extends from the proximal end side of the telescopic boom 23 toward the distal end side and hangs down from the distal end portion of the telescopic boom 23, and a wire A winch 25 for winding and unwinding the rope 24 and a hook block 26 suspended from the wire rope 24 suspended from the distal end portion of the telescopic boom 23 are provided.

  As shown in FIGS. 1 and 2, the carrier frame 100 has a swivel ring 101 as a connecting portion to which a swivel base 21 of the crane apparatus 20 is coupled via a swivel circle (not shown) on a top surface at a predetermined position in the front-rear direction. Have.

  A first outrigger box 13a of the first outrigger 13 and a second outrigger box 14a of the second outrigger 14 are provided in the lower part in front of the swiveling ring 101 of the carrier frame 100 so as to extend in the width direction. The first outrigger box 13a and the second outrigger box 14a are arranged side by side in the front-rear direction, the first outrigger box 13a is located on the front side, and the second outrigger box 14a is located on the rear side.

  A third outrigger box 15a of the third outrigger 15 and a fourth outrigger box 16a of the fourth outrigger 16 are provided in the lower part of the carrier frame 100 at the rear of the turning ring 101 so as to extend in the width direction. The third outrigger box 15a and the fourth outrigger box 16a are arranged side by side in the front-rear direction, the third outrigger box 15a is located on the front side, and the fourth outrigger box 16a is located on the rear side.

  As shown in FIG. 2, a jack support portion 102 for supporting the front jack 17 is provided at the center in the width direction on the front side of the carrier frame 100. Further, in front of the jack support portion 102, a hook locking bracket 103 is provided for passing a wire rope used when the hook block 26 is locked to the front end of the vehicle body 10 when the mobile crane 1 is traveling. Yes.

  As shown in FIGS. 2 to 5, the carrier frame 100 includes a pair of side members 110 that are spaced apart from each other in the width direction, a plurality of cross members 120 that connect the pair of side members 110 to each other, The upper plate 130 provided to connect the upper portions of the side members 110 in the front-rear direction, the lower plate 140 extending in the front-rear direction along the lower ends of the pair of side members 110, and the lower portion of the upper plate 130, respectively. And a lower plate 150 for connecting the lower plates 140 to each other.

  As shown in FIGS. 4 and 5, the pair of side members 110 are plate-like members that extend in the front-rear direction with their planes facing in the width direction. The pair of side members 110 are formed such that the distance between the front side and the front side is smaller than the rear side.

  Here, as shown in FIGS. 2 to 4, the engine E and the transmission T are disposed between the first outrigger box 13 a and the jack support portion 102 and between the pair of side members 110. The engine E and the transmission T are located on the front side in the front-rear direction, and the transmission T is located on the rear side of the engine E.

  As shown in FIGS. 4 and 5, the cross member 120 is a plate-like member that extends in the width direction with the plane directed in the front-rear direction. The cross member 120 includes a front end portion of the second outrigger box 14a, a rear end portion of the second outrigger box 14a, a front end portion of the turning ring 101, a rear end portion of the turning ring 101, and a front end of the third outrigger box 15a in the front-rear direction. And the rear end portion of the fourth outrigger box 16a. The cross member 120 has both ends in the width direction joined to the inner surfaces in the width direction of the pair of side members 110.

  The upper plate 130 is provided on the front side and the rear side of the swivel ring 101, and the lower surface side is joined to the upper end portions of the pair of side members 110 and the upper end portions of the cross members 120. An opening 131 is provided in a portion of the upper plate 130 where the engine E and the transmission T are located. The rear end portion of the opening 131 extends in the width direction along the cross member 120 disposed at the front end portion of the second outrigger box 14a.

  The lower plate 140 has an upper surface joined to a lower end of the pair of side members 110 and a lower end of each cross member 120. The lower plate 140 is provided on the rear side of the carrier frame 100 so as to extend inward in the width direction from the lower end of the side member 110, and on the front side, it is provided so as to extend from the lower ends of the pair of side members 110 to both sides in the width direction. It has been.

  The lower plate 150 is a plate-like member that extends in the front-rear direction and is bent downward on both sides in the width direction with respect to the central portion in the width direction. The lower plate 150 extends from between the first outrigger box 13a and the second outrigger box 14a. It is provided between the front end and between the rear end of the turning ring 101 and the front end of the third outrigger box 15a. The lower plate 150 is bonded to the cross member 120 on the upper surface side and is bonded to the upper surface of the lower plate 140 at both ends in the width direction.

  A pair of carrier frames 100 are provided between the front end portion of the second outrigger box 14a and the front end portion of the turning ring 101, and between the rear end portion of the turning ring 101 and the rear end portion of the fourth outrigger box 16a. The first and second box structures 201 and 202 including the side member 110, the cross member 120, the upper plate 130, the lower plate 140, and the lower plate 150 are configured. The first and second box structures 201 and 202 are structures that reinforce the carrier frame 100 and give the carrier frame 100 a predetermined rigidity.

  In addition, the carrier frame 100 has a second outrigger box 14a spaced from the left side member 110 on the inner side in the width direction of the left side member 110 located on the side where the first outrigger jack projects in the first outrigger box 13a. The first reinforcing member 160 extending forward from the cross member 120 positioned at the front end of the first member, the front of the cross member 120 positioned at the front end of the second outrigger box 14a extending in the width direction, and the left side member 110 and the first And a second reinforcing member 170 that connects the reinforcing member 160.

  The first reinforcing member 160 has a rear end portion joined to the cross member 120, a front end portion joined to the side member 110, an upper end portion joined to the upper plate 130, and a lower end portion joined to the lower plate 140.

  The second reinforcing member 170 has a left end joined to the side member 110, a right end joined to a substantially central portion in the front-rear direction of the first reinforcing member 160, an upper end joined to the upper plate 130, and a lower end. The part is joined to the lower plate 140.

  On the inner side in the width direction of the portion where the left side member 110 located on the side where the first outrigger jack projects in the first outrigger box 13a and the first outrigger box 13a intersect, the side member 110, the cross member 120, and the upper plate 130, the lower plate 140, the 1st reinforcement member 160, and the 3rd box structure 203 which consists of the 2nd reinforcement member 170 are comprised. The third box structure 203 is a reinforcing portion 200 that reinforces a portion located in front of the joint between the left side member 110 and the cross member 120 above the first outrigger box 13a. The rigidity is given.

  In the mobile crane 1 configured as described above, when the crane work is performed, the vehicle body 10 is supported by the first to fourth outriggers 13 to 16 and the front jack 17.

  In a state where the vehicle body 10 is supported by the first to fourth outriggers 13 to 16 and the front jack 17, the load of the crane device 20 and the suspended load acts on the carrier frame 100 via the turning ring 101, and the first to fourth outriggers. A reaction force acts on 13 to 16 and the front jack 17.

  At this time, since the second to fourth outriggers 14 to 16 are disposed below the first and second box structures 201 and 202, the carrier frame 100 is bent or twisted more than a predetermined amount due to the reaction force that acts. There is nothing. In addition, the first outrigger 13 is disposed below the position deviating forward from the first box structure 201, but is formed on the inner side in the width direction of the left side member 110 from which the first outrigger jack projects. Since it is arranged below the three-box structure 203, the carrier frame 100 will not bend or twist more than a predetermined amount due to the reaction force that acts.

  Further, the rear end portion of the opening 131 of the upper plate 130 is opened so as to extend in the width direction to the vicinity of the cross member 120 disposed at the front end of the second outrigger box 14a. Thus, it is possible to easily perform operations such as attaching and detaching the transmission T.

  As described above, according to the work vehicle frame of the present embodiment, the pair of left and right side members 110 extending in the front-rear direction at intervals in the width direction, and the position in the front-rear direction are at the front end portion of the second outrigger box 14a. A cross member 120 that couples the pair of side members 110 to each other, an upper plate 130 provided on top of the pair of side members 110 excluding a portion to which the engine E and the transmission T are attached, and a first outrigger box 13a. A reinforcing portion 200 is provided to reinforce the inner side in the width direction of the portion where the left side member 110 located on the side where the first outrigger arm projects and the first outrigger box 13a intersect.

  Thereby, since the whole width direction of the front width direction center part from the front-end part of the 2nd outrigger box 1a can be made into the opening part 131 as a maintenance space, it becomes possible to improve the working efficiency in a maintenance work. .

  The reinforcing portion 200 is a third box formed by the side member 110, the cross member 120, the first reinforcing member 160, the second reinforcing member 170, the upper plate 130, and the lower plate 140 above the first outrigger box 13a. Structure 203.

  Thereby, since the reinforcement part 200 can be comprised by simple structure, it becomes possible to aim at reduction of manufacturing cost.

  In the above-described embodiment, the third box structure 203 includes the side member 110, the cross member 120, the upper plate 130, the lower plate 140, the first reinforcing member 160, and the second reinforcing member 170. It is not limited to this. The first outrigger box 13a is directly joined to the lower end of the side member 110 without passing through the lower plate 140, and the side member 110, the cross member 120, the upper plate 130, the upper surface of the first outrigger box 13a, the first reinforcing member 160, and The third box structure may be configured by the second reinforcing member 170. Even in this case, it is possible to reinforce the inner side in the width direction of the portion where the left side member 110 located on the side where the first outrigger arm projects in the first outrigger box 13a and the first outrigger box 13a intersect, The entire width direction from the front end portion of the second outrigger box 1a to the front central portion in the width direction can be an opening 131 serving as a maintenance space.

  In the above-described embodiment, the reinforcing portion 200 is configured for the carrier frame 100 to which the engine E and the transmission T are attached in front of the turning ring 101. However, the engine E and the transmission are provided behind the turning ring 101. The reinforcing portion of the present invention can also be configured for the carrier frame to which T is attached.

  13a ... 1st outrigger box, 14a ... 2nd outrigger box, 100 ... Carrier frame, 101 ... Swivel ring, 110 ... Side member, 120 ... Cross member, 130 ... Upper plate, 140 ... Lower plate, 160 ... First reinforcing member , 170: second reinforcing member, 200: reinforcing portion, 203: third box structure, E: engine, T: transmission.

Claims (2)

And a pair of outrigger boxes that are arranged in the front-rear direction at the front lower portion of the connecting portion and that support the outrigger arms so as to be able to protrude and retract in the width direction. A work vehicle frame in which an engine and a transmission are mounted in front of a pair of outrigger boxes,
A pair of left and right side members extending in the front-rear direction at intervals in the width direction;
A cross member that is a front end portion of the rear outrigger box in the front-rear direction and connects the pair of side members to each other;
An upper plate provided on top of the pair of side members, excluding a portion to which the engine and transmission are attached;
A reinforcing portion that reinforces the inner side in the width direction of the portion where the side member located on the side where the outrigger arm projects in the front outrigger box and the front outrigger box intersect ,
A lower plate extending in the front-rear direction and extending in the width direction is provided at the lower ends of the pair of side members,
On the inner side in the width direction of the side member located on the side where the outrigger arm projects in the front outrigger box, a first reinforcing member extending forward from the cross member at a distance from the side member, and a side member in front of the cross member A second reinforcing member for connecting the first reinforcing member, and
The reinforcing portion has a box structure formed of a side member, a cross member, a first reinforcing member, a second reinforcing member, an upper plate and a lower plate above the front outrigger box on the front side. . And a pair of outrigger boxes that are arranged in the front-rear direction at the front lower portion of the connecting portion and that support the outrigger arms so as to be able to protrude and retract in the width direction. A work vehicle frame in which an engine and a transmission are mounted in front of a pair of outrigger boxes,
A pair of left and right side members extending in the front-rear direction at intervals in the width direction;
A cross member that is a front end portion of the rear outrigger box in the front-rear direction and connects the pair of side members to each other;
An upper plate provided on top of the pair of side members, excluding a portion to which the engine and transmission are attached;
A reinforcing portion that reinforces the inner side in the width direction of the portion where the side member located on the side where the outrigger arm projects in the front outrigger box and the front outrigger box intersect,
On the inner side in the width direction of the side member located on the side where the outrigger arm projects in the front outrigger box, a first reinforcing member extending forward from the cross member at a distance from the side member, and a side member in front of the cross member, A second reinforcing member for connecting the first reinforcing member, and
Reinforcing section, side members, cross members, the first reinforcing member, the second reinforcing member, work vehicle frame you being a box structure formed by the upper surface of the upper plate and the front outrigger box.

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