JP2006088920A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the strength of a frame by using a reinforcement plate having a simple structure, and contrives an improvement in the productivity and a reduction in the manufacturing cost. <P>SOLUTION: A right vertical plate 6 constituting the frame 3 is provided with the reinforcing plate 8, and this reinforcing plate 8 is made to have a constitution formed out of one sheet of plate extending frontward and rearward along the right vertical plate 6 in the peripheral part to be in the neighborhood of a pump insertion hole 6A. Accordingly, the intermediate position of the right vertical plate 6 provided with the pump insertion hole 6A in the frontward and rearward direction is reinforced with the reinforcing plate 8, and the strength of the frame 3 is enhanced. Further, the reinforcing plate 8 made out of one sheet of plate can be manufactured with a small number of parts and by a small number of working man-hours. Furthermore, the reinforcing plate 8 forms a closed sectional structure between it and the right vertical plate 6 by fixing a bent part 10 and a bent plate part 11 provided in the peripheral edge part of a main body plate 9 to the right vertical plate 6 of the frame 3, and the strength of the frame 3 can be further enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a work machine such as a lift truck having an engine, a hydraulic pump and the like mounted on a frame, for example.

  In general, for example, a lift truck that performs a cargo handling work for transporting a load from the ground to a high place is known as the work machine, and the lift truck includes a working device that can be raised and lowered on a self-propelled traveling body. .

  The lift truck as a work machine, for example, travels to the vicinity of a predetermined unloading place in a state where the load is loaded on a work tool such as a fork provided on the front end side of the work device, By rolling up and down, the loaded luggage is lifted to a predetermined unloading place and unloaded.

  The lift truck is provided with a frame composed of a bottom plate and left and right vertical plates extending on the left and right sides of the bottom plate and extending in the front and rear directions, and provided on the front and rear positions of the frame via axles. Left and right front wheels, rear wheels, a cab provided on the left side of the frame and defining a driver's cab inside, an engine mounted on the frame, a hydraulic pump, and an operation for supplying the hydraulic pump It is roughly constituted by a hydraulic oil tank for storing oil.

  The lift truck is equipped with many devices such as an engine, a hydraulic pump, and a hydraulic oil tank in a limited space of the frame. For this reason, the lift truck, for example, forms a device insertion hole through which the engine, hydraulic pump, etc. pass through the vertical plate of the frame, and effectively passes the limited space of the frame by passing the engine, hydraulic pump, etc. through the device insertion hole. (For example, refer to Patent Document 1).

JP-A-8-118966

  By the way, in the lift truck by the prior art mentioned above, the apparatus insertion hole for inserting some engines, a hydraulic pump, etc. is formed in the vertical board of a flame | frame. For this reason, since the strength of the frame is reduced by the device insertion hole formed in the vertical plate, it is necessary to attach a reinforcing member for increasing the strength to the vertical plate.

  However, since the frame is provided with devices such as an engine, a hydraulic pump, and a hydraulic oil tank, and pipes, wirings, and the like that connect them, the reinforcing member has a complicated shape avoiding these. For this reason, since the reinforcing member must be formed by welding a large number of plate members, it is difficult to obtain high strength, and there is a problem in that productivity is lowered and manufacturing cost is increased.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to improve productivity and reduce manufacturing cost by increasing the strength of the frame using a reinforcing plate having a simple structure. It is to provide a work machine that can be used.

  According to a first aspect of the present invention, there is provided a working machine having a frame extending in the front and rear directions, on which a prime mover, hydraulic equipment, and the like are mounted and wheels are provided in front and rear positions, and the traveling And a working device provided on the body.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that the frame includes at least a bottom plate and left and right sides of the bottom plate, and a left extending in the front and rear directions. , And a right vertical plate, and at least one of the left and right vertical plates constituting the frame is composed of a single plate extending forward and rearward along the vertical plate. The reinforcement plate is provided.

  According to the second aspect of the present invention, the peripheral portion of the reinforcing plate is provided with a bent portion that bends to the vertical plate side of the frame, and the distal end portion of the bent portion is fixed to the vertical plate. .

  According to the invention of claim 3, the prime mover and the hydraulic device are connected to the vertical plate in the left and right directions, and are connected to at least one of the left and right vertical plates constituting the frame. A device insertion hole through which the hydraulic device is inserted when the prime mover and the hydraulic device are mounted is provided, and the reinforcing plate is arranged in the vicinity of the device insertion hole.

  According to invention of Claim 4, it exists in having set it as the structure which fixes the said reinforcement board to the said vertical board in the state positioned by putting the lower end of the said reinforcement board on the said baseplate.

  According to the invention of claim 5, the reinforcing plate is arranged at an intermediate position in the front and rear directions of the frame between the front and rear wheels.

  According to the first aspect of the present invention, since the reinforcing plate is provided on at least one of the left and right vertical plates constituting the frame, the strength of the frame can be increased by the reinforcing plate. Moreover, since the reinforcing plate is formed by a single plate extending in the front and rear directions along the vertical plate, the reinforcing plate can be easily manufactured with a small number of parts and processing man-hours. The improvement of property and reduction of manufacturing cost can be aimed at.

  According to the invention of claim 2, a high-strength closed cross-section structure is formed by the vertical plate and the reinforcing plate by fixing the tip of the bent portion provided at the peripheral portion of the reinforcing plate to the vertical plate of the frame. be able to. Thereby, the reinforcing plate can further increase the strength of the frame. Alternatively, the vertical plate and the reinforcing plate of the frame can be formed of a thin plate material, and the weight can be reduced and the manufacturing cost can be reduced.

  According to the invention of claim 3, since the device insertion hole is provided in the vertical plate of the frame, when the prime mover and the hydraulic device are mounted on the frame, the prime mover is inserted by inserting the hydraulic device into the device insertion hole. In addition, hydraulic equipment and the like can be efficiently arranged in a limited space. In addition, since the vertical plate of the frame surrounds the device insertion hole and a reinforcing plate is arranged in the vicinity thereof, the strength reduction of the vertical plate due to the formation of the device insertion hole can be compensated for, and the strength of the frame is increased. Can be effectively increased.

  According to the invention of claim 4, when the reinforcing plate is attached to the vertical plate of the frame, the reinforcing plate can be positioned in the upward and downward directions by placing the lower end of the reinforcing plate on the bottom plate of the frame. Thereby, the positioning operation of the reinforcing plate can be simplified, and the reinforcing plate can be easily fixed to the vertical plate.

  According to the invention of claim 5, during running or working, the frame may be twisted at an intermediate position in the front and rear directions located between the front wheels and the rear wheels. However, since the reinforcing plate is provided at the intermediate position, the strength of the frame can be increased against twisting.

  Hereinafter, a lift truck will be described as an example of a work machine according to an embodiment of the present invention and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a lift truck as a work machine. The lift truck 1 is composed of a wheel-type traveling body 2 capable of self-propelling and a working device 22, which will be described later. It is roughly structured. The lift truck 1 performs a cargo handling operation for transporting a load from the ground to a high place using the work device 22 after traveling the traveling body 2 and traveling to the work place. The traveling body 2 of the lift truck 1 is roughly constituted by a frame 3, a reinforcing plate 8, a front wheel 13, a rear wheel 15, an engine 16, a hydraulic pump 17, a hydraulic oil tank 20, a cab 21 and the like which will be described later.

  Reference numeral 3 denotes a frame serving as a base of the traveling body 2, and the frame 3 is formed as a support structure extending in the front and rear directions as shown in FIGS. 2 and 3, and includes a bottom plate 4, a left vertical plate 5, and a right It is roughly constituted by a vertical plate 6, a support base 7, and the like.

  Reference numeral 4 denotes a bottom plate constituting the bottom of the frame 3, and the bottom plate 4 is formed as a plate extending in the front and rear directions using a steel plate material having a predetermined thickness. The bottom plate 4 is positioned on the front side to support a front wheel support portion 4A that supports a later-described front wheel 13, a rear wheel support portion 4B that is positioned on the rear side to support a rear wheel 15 that will be described later, and the front wheel support portion 4A. The intermediate front plate portion 4C, the intermediate middle plate portion 4D, and the intermediate rear plate portion 4E provided between the rear wheel support portion 4B and the rear wheel support portion 4B.

  Further, the intermediate middle plate portion 4D and the intermediate rear plate portion 4E are arranged at intervals in the front and rear directions in order to avoid the hydraulic oil tank insertion hole 5C of the left vertical plate 5 and the pump insertion hole 6A of the right vertical plate 6. ing. Thus, between the intermediate middle plate portion 4D and the intermediate rear plate portion 4E, the pipe connecting portion 20A of the hydraulic oil tank 20 inserted into the hydraulic oil tank insertion hole 5C of the left vertical plate 5 and the right vertical plate 6 are connected. A hydraulic pump 17 inserted in the pump insertion hole 6A is disposed. Further, the intermediate intermediate plate portion 4D and the intermediate rear plate portion 4E are disposed at a position where the intermediate rear plate portion 4E is higher than the intermediate intermediate plate portion 4D.

  Reference numeral 5 denotes a left vertical plate provided on the left side of the bottom plate 4. The left vertical plate 5 is made of a steel plate or the like having a predetermined thickness, and is formed to rise substantially vertically and extend in the front and rear directions. ing. Further, support brackets 5A and 5B are provided at an intermediate position in the front and rear directions of the left vertical plate 5 so as to be separated from each other in the front and rear directions, and a cab 21 described later is mounted on each of the support brackets 5A and 5B. It is done. Further, as shown in FIG. 3, a hydraulic oil tank insertion hole 5C is provided at an intermediate position in the front and rear directions of the left vertical plate 5, and a hydraulic oil tank 20 described later is provided in the hydraulic oil tank insertion hole 5C. The pipe connection part 20A is inserted.

  Reference numeral 6 denotes a right vertical plate provided on the right side of the bottom plate 4, and the right vertical plate 6 is disposed on the right side of the left vertical plate 5 in a substantially parallel manner with a predetermined interval. And the right vertical board 6 is formed using the steel plate material etc. with predetermined thickness similarly to the left vertical board 5, and is formed so that it may stand | start up substantially perpendicularly and may extend in the front and back direction. On the right side of the right vertical plate 6, an engine 16, a hydraulic pump 17, and the like are attached via a support base 7, which will be described later, at an intermediate position in the front and rear directions. Installed.

  Further, as shown in FIG. 4, a pump insertion hole 6A serving as a device insertion hole is formed at an intermediate position in the front and rear directions of the right vertical plate 6, and the pump insertion hole 6A is shown in FIGS. Thus, the opening is large so that a hydraulic pump 17 attached to the engine 16 described later can be inserted. Further, as shown in FIG. 5, a reinforcing plate 8 described later is attached to the left side of the right vertical plate 6 at a position above the pump insertion hole 6A so as to surround the pump insertion hole 6A.

  Here, the right vertical plate 6 constituting the frame 3 is provided with a pump insertion hole 6A that opens greatly at the intermediate position in the front and rear directions, so that the strength decreases at the intermediate position in the front and rear directions. For this reason, it is set as the structure which provides the below-mentioned reinforcement board 8 in the intermediate position of the front and back direction of the right vertical board 6. FIG.

  Reference numeral 7 denotes a square frame-shaped support base (see FIGS. 2 and 3) attached to the right side of the right vertical plate 6. The support base 7 is located between the front wheel 13 and the rear wheel 15 before and after. It is attached to the right vertical plate 6 by means such as bolting at an intermediate position in the direction. The support base 7 supports an engine 16, a hydraulic pump 17, a radiator 18, an oil cooler 19, and the like which will be described later.

  Next, reference numeral 8 denotes a reinforcing plate that is provided on the left side of the right vertical plate 6 so as to extend in the front and rear directions. The reinforcing plate 8 is located between the front wheel 13 and the rear wheel 15 described later in the front and rear directions. And is provided across the vicinity of the pump insertion hole 6 </ b> A of the right vertical plate 6. Thereby, the reinforcement board 8 can raise the intensity | strength of the right vertical board 6 in the position of 6 A of pump penetration holes. Further, as shown in FIGS. 6 and 7, the reinforcing plate 8 extends forward and rearward along the right vertical plate 6 by integrally fixing a main body plate 9 and a bent plate portion 11 to be described later. It is formed as a single plate.

  Reference numeral 9 denotes a main body plate constituting the main body portion of the reinforcing plate 8. This main body plate 9 uses a single steel plate material that is seamless in the front and rear directions, and is centered by a front plate 9A located on the front side, a middle plate 9B located in the middle, and a rear plate 9C located on the rear side. Is formed in a mountain shape protruding upward. The main body plate 9 is formed with a pump opening 9D so as to avoid the hydraulic pump 17 at a position corresponding to the pump insertion hole 6A of the right vertical plate 6 below the middle plate 9B. Accordingly, the main body plate 9 has a shape extending in the front and rear directions while being curved upward around the pump insertion hole 6A as a whole.

  Here, the pump opening 9 </ b> D is formed in a substantially U shape that opens downward, and surrounds the upper periphery of the pump insertion hole 6 </ b> A formed in the right vertical plate 6. Accordingly, the pump opening 9D can reinforce the peripheral portion of the pump insertion hole 6A while allowing the hydraulic pump 17 to be inserted into the pump insertion hole 6A.

  On the other hand, the main body plate 9 has a large height at the positions of the front plate 9A, the middle plate 9B, and the rear plate 9C while avoiding surrounding equipment, piping, etc. by forming it in a mountain shape (curved shape). Can be formed. Thereby, the main body plate 9 can enlarge the space | interval of the below-mentioned bending part 10 and the bending plate part 11, and when it adheres to the right vertical board 6, as shown in FIG. Can be formed.

  Further, as shown in FIG. 6, the front plate 9A and the rear plate 9C of the main body plate 9 are different in the positions of the lower ends in the upper and lower directions, and the rear plate 9C is more than the front plate 9A. It is arranged at a position higher by the dimensional difference G. Here, the dimensional difference G between the front plate 9A and the rear plate 9C is set to be approximately the same as the step between the intermediate middle plate portion 4D and the intermediate rear plate portion 4E of the bottom plate 4, thereby By placing the lower end of the front plate 9A on the intermediate middle plate portion 4D of the bottom plate 4 and the lower end of the rear plate 9C on the intermediate rear plate portion 4E of the bottom plate 4, the reinforcing plate 8 is positioned at a predetermined position in the upward and downward directions. The subsequent welding operation can be easily performed.

  Reference numeral 10 denotes a bent portion provided on the upper peripheral portion of the main body plate 9, and the bent portion 10 is formed by bending the upper peripheral portion of the main plate 9 to the right vertical plate 6 side (right side). It is formed along the mountain shape of the plate 9. Moreover, since the bending part 10 can raise the intensity | strength of the upper part of the reinforcement board 8 by bending and forming the upper peripheral part of the main body board 9, it reinforces the right vertical board 6 effectively. be able to.

  Here, the bending portion 10 is formed by bending the bending allowances 10A, 10B, and 10C of the main body plate 9 'cut out as shown in FIG. 9 along the dotted lines, and then between the bending allowances 10A and 10B. The abutting portion 10D and the abutting portions 10E between the bending margins 10B and 10C are welded respectively to be integrally formed with the main body plate 9.

  Reference numeral 11 denotes a bent plate portion as a bent portion fixed integrally to the right side of the main body plate 9. The bent plate portion 11 is made of a strip-shaped steel plate material having substantially the same width as the bent portion 10, and is bent at a plurality of locations in the length direction of the steel plate material, thereby It is substantially U-shaped along the pump opening 9D. Further, the bending plate portion 11 surrounds the upper periphery of the pump insertion hole 6A of the right vertical plate 6 in substantially the same manner as the pump opening 9D of the main body plate 9, so that the hydraulic pump 17 is inserted into the pump insertion hole 6A. In this way, the vicinity of the pump insertion hole 6A is reinforced.

  Then, as shown in FIG. 8, the bent plate portion 11 is integrally fixed to the body plate 9 by pressing the edge in the width direction around the pump opening 9D and applying welding means in this state. ing. Thereby, since the bending plate part 11 can raise the intensity | strength of the lower part of the reinforcement board 8 by bending and forming the lower peripheral part of the main body board 9, it is right with the bending part 10 right. The vertical plate 6 can be effectively reinforced.

  As shown in FIG. 8, the reinforcing plate 8 configured as described above includes a bent portion 10 and a bent plate portion 11 so that the pump opening 9 </ b> D of the main body plate 9 fits the pump insertion hole 6 </ b> A of the right vertical plate 6. Is pressed against the left side of the right vertical plate 6 and, in this state, welding means is applied between the front end portion of the bent portion 10 and the front end portion of the bent plate portion 11 and the left side surface of the right vertical plate 6, thereby It is fixed to the plate 6. At this time, the reinforcing plate 8 places the front plate 9A of the main body plate 9 on the intermediate middle plate portion 4D of the bottom plate 4 and places the rear plate 9C on the intermediate rear plate portion 4E, whereby the right vertical plate 6 has a predetermined shape. It can be easily positioned.

  Then, the reinforcing plate 8 is welded to the right vertical plate 6 to form a closed cross-sectional structure having a large cross-sectional area, so that the strength is lowered by the pump insertion hole 6A before and after the right vertical plate 6. The intermediate position in the direction can be reinforced. Further, the right vertical plate 6 enhances the strength of the frame 3 against torsion occurring between the front wheel 13 and the rear wheel 15 described later by reinforcing the intermediate position in the front and rear directions with the reinforcing plate 8. be able to.

  Reference numerals 12 and 12 denote left and right front axles (shown in FIG. 2) provided on the front wheel support portion 4A of the bottom plate 4 constituting the frame 3 so as to protrude in the left and right directions. A differential device (not shown) provided on the lower side of the support portion 4A extends in the left and right directions, and a front wheel 13 is rotatably attached to each tip portion. The left and right front wheels 13 are steered by a steering device (not shown) disposed in the cab 21 to cause the traveling body 2 to travel straight, turn left, and turn right. The left and right front wheels 13 are connected to a traveling hydraulic motor (not shown) serving as a rotation source.

  Reference numerals 14 and 14 denote left and right rear axles which are provided on the rear wheel support 4B of the bottom plate 4 constituting the frame 3 so as to protrude in the left and right directions, and the base ends of the rear axles 14 are rear wheel supports. A differential device (not shown) provided on the lower side of the portion 4B extends leftward and rightwardly, and a rear wheel 15 is rotatably attached to each front end portion. The rear wheel 15 can be steered in conjunction with the front wheel 13 by a steering device. The left and right rear wheels 15 are connected to a traveling hydraulic motor serving as a rotation source.

  As a result, the rotation of the left and right front wheels 13 and the left and right rear wheels 15 is transmitted to the respective differential devices from the traveling hydraulic motors serving as a rotation source, thereby causing the traveling body 2 to travel forward and backward. Can be made.

  Reference numeral 16 denotes an engine (shown in FIG. 2) as a prime mover mounted on the rear side of the support base 7 via an engine mount (not shown). The engine 16 is a lateral extending in the left and right directions. It is arranged in a standing state.

  Reference numeral 17 denotes a hydraulic pump connected to the left side of the engine 16. The hydraulic pump 17 is driven by the engine 16 to supply hydraulic oil from a hydraulic oil tank 20 to be described later to a hydraulic motor, a work device 22, and the like, via a hydraulic oil pipe (not shown). The hydraulic oil tank 20 is connected to a pipe connection portion 20A. As shown by a two-dot chain line in FIG. 3, the hydraulic pump 17 is mounted on the support base 7 together with the engine 16, and the support base 7 is attached to the right vertical plate 6 as shown in FIG. As described above, the pump is inserted into the pump insertion hole 6 </ b> A of the right vertical plate 6 and disposed between the left and right vertical plates 5 and 6.

  Reference numeral 18 denotes a radiator disposed near the front side of the support base 7, and the radiator 18 cools engine cooling water. Reference numeral 19 denotes an oil cooler that is provided on the front side of the radiator 18. The oil cooler 19 cools the working oil that is returned to the working oil tank 20.

  Reference numeral 20 denotes a hydraulic oil tank (shown in FIG. 2) which is located in the middle of the front and rear directions of the frame 3 and is attached to the left vertical plate 5. The hydraulic oil tank 20 has its pipe connection portion 20A connected to the hydraulic oil. It is attached to the left vertical plate 5 in a state of being inserted into the tank insertion hole 5C. The hydraulic oil tank 20 stores hydraulic oil, and a pipe connecting portion 20A is connected to the hydraulic pump 17 and the oil cooler 19 via a hydraulic oil pipe (not shown).

  21 is a cab located between the left front wheel 13 and the rear wheel 15 and provided on the left side of the frame 3. The cab 21 is formed as a hollow structure defining a cab, and the left vertical plate 5 Are supported on the support brackets 5A and 5B. In the cab 21, a steering device, a driver's seat, an operation lever, and the like (all not shown) are disposed.

  Next, reference numeral 22 denotes a work device that performs a cargo handling work for transporting a load from the ground to a high place. The work device 22 is provided at the rear portion of the traveling body 2 so as to be raised and lowered. In addition, the working device 22 includes a boom 23 whose base end side is pin-coupled to the rear upper end side of the frame 3 and whose front end side extends to the front side, and a cargo handling tool such as a fork that is rotatably attached to the front end side of the boom 23. 24.

  Here, the boom 23 is configured as a multi-stage telescopic boom, and can be expanded and contracted by a boom telescopic cylinder 23A. Further, the boom 23 can be raised and lowered by extending and retracting a boom raising and lowering cylinder 25 provided between the boom 23 and the frame 3.

  The lift truck 1 according to the present embodiment has the above-described configuration. Next, a case where cargo handling work is performed using the lift truck 1 will be described.

  First, a load is loaded on the cargo handling tool 24 of the work device 22, and the traveling body 2 is traveled to move to the work site. Then, an operator in the cab 21 operates an operation lever for the work device 22. As a result, the boom 23 is raised by the boom hoisting cylinder 25, and the boom 23 is extended by the boom telescopic cylinder 23A.

  Further, when the traveling body 2 travels or when the load is transported by the work device 22, a load acts so as to twist the frame 3, for example. However, since the strength of the frame 3 is enhanced by the reinforcing plate 8 provided on the right vertical plate 6, it can sufficiently withstand loads such as torsion.

  Thus, according to the present embodiment, the right vertical plate 6 constituting the frame 3 is provided with the reinforcing plate 8, and the reinforcing plate 8 extends along the right vertical plate 6 in the peripheral portion in the vicinity of the pump insertion hole 6A. It is formed by a single plate extending in the front and rear directions. Accordingly, the intermediate position in the front and rear direction of the right vertical plate 6 provided with the pump insertion hole 6A can be reinforced by the reinforcing plate 8, and the strength of the frame 3 can be increased. Moreover, the reinforcing plate 8 formed as a single plate can be easily manufactured with a small number of parts and processing steps, so that productivity can be improved and manufacturing cost can be reduced.

  Further, the reinforcing plate 8 has a large cross-sectional area between the right vertical plate 6 by fixing the bent portion 10 and the bent plate portion 11 provided on the peripheral edge of the main body plate 9 to the right vertical plate 6 of the frame 3. It is possible to form a closed cross-sectional structure having Thereby, the reinforcement board 8 can further raise the intensity | strength of the flame | frame 3 with a closed cross-section structure. Alternatively, the frame 3 and the reinforcing plate 8 can be formed of a thin plate material, which can reduce the weight and the manufacturing cost.

  On the other hand, even when the pump insertion hole 6 </ b> A is provided in the right vertical plate 6 of the frame 3, the reinforcing plate 8 is provided with the bent portion 10 at the upper peripheral edge of the main body plate 9 and the bent plate portion 11 at the lower peripheral edge. Therefore, the strength of the main body plate 9, that is, the strength of the right vertical plate 6 can be effectively increased.

  Further, when the reinforcing plate 8 is attached to the right vertical plate 6, the lower end of the front plate 9 </ b> A of the main body plate 9 is placed on the intermediate middle plate portion 4 </ b> D of the bottom plate 4, and the lower end of the rear plate 9 </ b> C of the main body plate 9 is the middle of the bottom plate 4. By placing it on the rear plate portion 4E, it can be easily positioned at a predetermined position with respect to the right vertical plate 6 (pump insertion hole 6A). Therefore, the positioning operation when welding the reinforcing plate 8 to the right vertical plate 6 can be simplified, and the workability during the assembly operation can be improved.

  Further, since the reinforcing plate 8 is provided at an intermediate position in the front and rear directions of the frame 3 located between the front wheel 13 and the rear wheel 15, it is possible to suppress the torsional deformation of the frame 3 occurring at this intermediate position, Durability and reliability can be improved.

  In the embodiment, the right vertical plate 6 constituting the frame 3 is provided with the reinforcing plate 8, and the reinforcing plate 8 increases the strength around the pump insertion hole 6 </ b> A of the right vertical plate 6. However, the present invention is not limited to this. For example, as in the first modification shown by a two-dot chain line in FIG. 2, the left vertical plate 5 of the frame 3 is added to the reinforcing plate 8 of the right vertical plate 6. Alternatively, another reinforcing plate 31 formed in substantially the same manner as the reinforcing plate 8 may be provided. In this case, the strength around the hydraulic oil tank insertion hole 5 </ b> C of the left vertical plate 5 can be increased by the reinforcing plate 31. Further, the reinforcing plate 8 of the right vertical plate 6 may be eliminated, and the reinforcing plate 31 may be provided only on the left vertical plate 5.

  In the embodiment, the reinforcing plate 8 is formed by bending a part of the main body plate 9 to form the bent portion 10 and welding the bent plate portion 11 to be integrated with the main body plate 9. The case where it was formed as a plate has been described as an example. However, the present invention is not limited to this, and the reinforcing plate 41 may be formed by bending (pressing) a single plate material, for example, as in the second modification shown in FIG. That is, the reinforcing plate 41 according to the second modified example forms an upper bent portion 43 by bending on the upper side of the main body plate 42 and forms a lower bent portion 44 by bending on the lower side of the main body plate 42. It is good also as a structure.

  Furthermore, in the embodiment, the lift truck 1 in which the cargo handling tool 24 for cargo handling work is provided on the distal end side of the working device 22 is described as an example. However, the present invention is not limited to this, and can be widely applied to other work machines such as an aerial work vehicle provided with a work table on which a worker gets on the front end side of the work device.

It is a front view which shows the lift truck applied to embodiment of this invention. It is a top view which shows a lift truck in the state which removed the cab, the working device, etc. It is an external appearance perspective view which shows the state which attaches an engine and a hydraulic pump to the flame | frame with which the reinforcement board was attached. It is a principal part enlarged view which expands and shows the front and back direction intermediate position from the left side of a right vertical board. It is a principal part enlarged view which expands and shows the state which attached the reinforcement board to the left side of the right vertical board. It is the external appearance perspective view seen from the left side in the state which expanded the reinforcement board. It is the external appearance perspective view seen from the right side in the state which expanded the reinforcement board. It is sectional drawing of the principal part expansion which looked at the attachment state of the reinforcement board with respect to a right vertical board from the arrow VIII-VIII direction in FIG. It is a disassembled perspective view which shows a reinforcement board in the state before a bending process and an assembly. It is the external appearance perspective view seen from the right side in the state which expanded the reinforcement board by the 2nd modification of this invention.

Explanation of symbols

1 Lift truck (work machine)
2 traveling body 3 frame 4 bottom plate 4A front wheel support portion 4B rear wheel support portion 4C intermediate front plate portion 4D intermediate middle plate portion 4E intermediate rear plate portion 5 left vertical plate 5A, 5B support bracket 5C hydraulic oil tank insertion hole 6 right vertical plate 6A Pump insertion hole 8, 31, 41 Reinforcement plate 9, 9 ', 42 Main plate 9A Front plate 9B Middle plate 9C Rear plate 9D Pump opening 10 Bending portion 11 Bending plate portion (bending portion)
13 Front wheels
15 Rear wheel
16 engine (motor)
17 Hydraulic pump 20 Hydraulic oil tank 20A Piping connection portion 22 Working device 43 Upper bent portion 44 Lower bent portion

Claims (5)

A traveling body having a frame extending in the front and rear directions, on which a prime mover, hydraulic equipment, and the like are mounted, and wheels are provided in front and rear positions, and a working device provided in the traveling body are provided. In the work machine
The frame is composed of at least a bottom plate and left and right vertical plates located on both left and right sides of the bottom plate and extending in the front and rear directions,
At least one of the left and right vertical plates constituting the frame is provided with a reinforcing plate composed of a single plate extending in the front and rear directions along the vertical plate. Work machine.   The working machine according to claim 1, wherein a bending portion that bends toward the vertical plate side of the frame is provided at a peripheral portion of the reinforcing plate, and a distal end portion of the bending portion is fixed to the vertical plate.   The prime mover and the hydraulic device are connected to the vertical plate in the left and right directions, and the connected prime mover and the hydraulic device are mounted on at least one of the left and right vertical plates constituting the frame. The work machine according to claim 1 or 2, wherein a device insertion hole through which the hydraulic device is inserted is sometimes provided, and the reinforcing plate is arranged in the vicinity of the device insertion hole.   The work machine according to claim 1, 2, or 3, wherein the reinforcing plate is fixed to the vertical plate in a state where the lower end of the reinforcing plate is positioned by being placed on the bottom plate.   5. The work machine according to claim 1, 2, 3, or 4, wherein the reinforcing plate is arranged at an intermediate position in a front and rear direction of a frame between the front and rear wheels.

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