WO2006033311A1

WO2006033311A1 - Working machine

Info

Publication number: WO2006033311A1
Application number: PCT/JP2005/017235
Authority: WO
Inventors: Masashi Nakanishi; Shinichi Hisamatsu; Makoto Matsushita
Original assignee: Hitachi Construction Machinery Co., Ltd.
Priority date: 2004-09-24
Filing date: 2005-09-13
Publication date: 2006-03-30
Also published as: JP2006088920A

Abstract

A frame (3) has a bottom plate (4), a left vertical plate (5), and a right vertical plate (6). A pump insertion hole (6A) is provided at an intermediate position in a front-rear direction of the right vertical plate. In the pump insertion hole is inserted a hydraulic pump (17) connected in series to an engine (16). On the other hand, on the right vertical plate, there is provided a reinforcement plate (8) made of a single plate straddling above the pump insertion hole and extending in the front-rear direction along the right vertical plate. As a result, the intermediate position, at which the pump insertion hole is provided, in the front-rear direction of the right vertical plate is reinforced by the reinforcement plate, and this increases the strength of the frame. In this case, the reinforcement plate secures a bent section (10) and bent plate section, which are arranged in a peripheral edge section of a body plate (9), to the right vertical plate (6). Thus a closed cross-section structure is formed between the reinforcement plate and the right vertical plate to further increase the strength of the frame.

Description

Technical field of work machinery

The present invention relates to a work machine suitable for use as, for example, a lift track for performing a cargo handling operation.

Light

Background art

In general, work machines, for example, carry luggage from the ground to somewhere

There are known riffle racks, etc. that carry cargo handling work, and the riffle racks are equipped with a boom device that can be raised and lowered on a self-propelled traveling body.

The riffle rack as a work machine 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 tip side of the boom unit, for example. In the unloading operation, the load is lifted to a predetermined unloading place by moving the boom device and unloaded.

The lift truck also has a frame consisting of a bottom plate, left and right sides of the bottom plate, front and rear left and right vertical plates, and axles in front and rear of the frame. Left and right front wheels and rear wheels installed on the left side of the frame, a cab on the left side of the frame that defines a cab inside, an engine mounted on the frame m, and a hydraulic pump It is roughly constituted by a hydraulic device such as a control valve and a hydraulic oil tank for storing hydraulic fluid supplied to the hydraulic pump.

In addition, lift trucks are used in many spaces such as engines, hydraulic pumps, hydraulic oil tanks, etc. For example, a riff rack is formed with a machine hole that passes through the vertical plate of the frame, for example, an X-axis, a hydraulic pump, etc. By passing through the through-hole, it is configured to effectively use a space with a limited number of frames (for example, JP-A-8-1).

1 8 9 6 6).

By the way, in the above-described conventional refractory rack, X,

A device insertion hole is formed to allow passage of a part of the hydraulic pump and the like. For this reason, since the strength is lowered by the frame through hole formed in the vertical plate, it is necessary to attach a reinforcing member for increasing the strength to the vertical plate.

However, the frame is equipped with equipment such as X engine, hydraulic pump, hydraulic oil tank, etc., piping connecting them, wiring, etc. Become. For this reason, the reinforcing member has to be formed by welding a large number of plate materials, which makes it difficult to obtain high strength, and also causes a decrease in productivity and an increase in manufacturing cost. There is. Disclosure of the invention

The present invention has been made in view of the above-mentioned problems of the prior art, and the object of the present invention is to improve productivity by increasing the strength of the frame by using a reinforcing plate having a simple structure. Another object is to provide a working machine that can reduce manufacturing costs.

(1) A work machine according to the present invention has a frame extending in the forward and backward directions, and is mounted with a prime mover, a hydraulic device, etc. on the frame, and is provided with wheels at the front and rear positions. And a boom device provided on the traveling body. In order to solve the above-described problems, the configuration of the present invention is characterized in that the frame includes at least the bottom plate and the left and right sides of the bottom plate and extends in the front and rear directions. It is composed of left and right vertical plates, and B frame is composed of at least one of the left and right vertical plates.

—

Along with the plate, there is a configuration in which a reinforcing plate consisting of a single plate extending backward is provided.

In other words, there are few left and right vertical plates that make up the frame. <At least one vertical plate is provided with a reinforcing plate, so that the strength of the frame is increased by the reinforcing plate. That's right. Moreover, the reinforcing plate is formed from a single te. Body that extends forward and backward along the vertical plate, so that the reinforcing plate can be easily reduced in the number of parts and man-hours. It can be manufactured, and productivity can be improved and manufacturing cost can be reduced.

(2). In the present invention, the one vertical plate is provided with a device through hole through which the hydraulic device is inserted, and the reinforcing rod is arranged in the vicinity of the device through hole. Is preferred.

With this configuration, a reinforcing plate is placed in the vicinity of the machine insertion hole provided in one vertical plate, so one of the vertical plates around the device through-hole is connected to this reinforcing plate. Can be supplemented.

(3) Further, in the present invention, it is preferable that the reinforcing plate is arranged to extend in the front and rear directions across the upper side of the device through hole.

With this configuration, it is possible to further increase the strength against the load acting on the vertical plate from above.

(4) According to 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, It is good also as a structure which fixes the front-end | tip part of this bending part to the said vertical board.

In this case, 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 edge of the reinforcing plate to the vertical plate of the frame. Including ■ 0. As a result, the reinforcing plate can further increase the strength of the frame. Alternatively, the longitudinal 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.

(5) Further, in the present invention, the prime mover and a hydraulic pump, which is one of the hydraulic devices, are connected in series and arranged in the left and right directions with respect to the vertical plate, At least one of the left and right vertical plates constituting the frame is provided with a pump passage hole through which the hydraulic pump passes when the prime mover and the hydraulic pump are mounted. The pump may be arranged in the vicinity of the through hole.

In this case, the vertical plate of the frame has a pump passage hole. Therefore, when the prime mover and the hydraulic pump are mounted on the frame, the hydraulic pump is inserted into the pump penetration hole. A hydraulic pump or the like can be efficiently installed in a limited space. Moreover, since the vertical plate of the frame surrounds the pump through hole and a reinforcing plate is arranged in the vicinity thereof, the periphery of the pump through hole can be reinforced to effectively increase the strength of the frame. .

(6) Further, in the present invention, the other vertical plate of the left and right vertical plates constituting the frame is provided with a part of the hydraulic oil tank at a position facing the pump through hole. A hydraulic oil tank through hole to be inserted is provided, and the hydraulic pump inserted into the pump through hole is connected to the hydraulic oil tank. Is preferred.

In this case, a hydraulic pump is passed through the pump hole provided in one of the left and right vertical plates, and a part of the hydraulic oil tank is passed through the hydraulic oil tank hole provided in the other vertical plate. As a result, it is possible to easily connect the hydraulic pump and the hydraulic oil tank using a short pipe or the like, thereby improving the workability.

(7). In the present invention, it is preferable that another reinforcing plate extending in the front and rear directions along the hydraulic oil tank through hole is provided in the other longitudinal direction.

With this configuration, the other reinforcing plate can reinforce the periphery of the hydraulic oil tank through hole in the other vertical plate, and the strength of the entire frame can be increased.

(8) In the present invention, the reinforcing plate may be fixed to the vertical plate in a state where the reinforcing plate is positioned by placing the “F end” of the reinforcing plate on the bottom plate.

In this case, when the reinforcing plate is attached to the vertical plate of the frame, the reinforcing plate can be positioned upward and downward 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.

(9) In the present invention, the reinforcing plate may be arranged at an intermediate position in the front and rear directions of the frame between the front and rear wheels.

Here, during running and working, the frame may twist at the intermediate position in the front and rear direction, located between the front and rear wheels. However, in the present invention, since the reinforcing plate is provided at this intermediate position, the strength of the frame is also improved against torsion. Can be increased. Brief Description of Drawings

FIG. 1 is a front view showing a lift track applied to the embodiment of the present invention.

FIG. 2 is a plan view showing the lift truck with the cap, the boom device, etc. removed.

FIG. 3 is an external perspective view showing a state before the engine and the hydraulic pump are attached to the frame.

Fig. 4 is an enlarged view of the main part showing the front and rear middle positions of the right vertical plate, enlarged from the left side.

Fig. 5 is an enlarged view of the main part showing a state where the reinforcing plate is attached to the left side of the right vertical plate.

Fig. 6 is an external perspective view of the reinforcement plate as seen from the left side with the enlarged view.

Fig. 7 is an external perspective view of the reinforcing plate as seen from the right side in an enlarged state.

Fig. 8 is an enlarged cross-sectional view of the main part of the reinforcing plate attached to the right vertical plate as seen from the direction of arrows VI I I-VI I I in Fig. 5.

Fig. 9 is an exploded perspective view showing the reinforcing plate before bending and before assembly.

FIG. 10 is an external perspective view seen from the right side in a state where the reinforcing plate according to the first modification of the present invention is expanded. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a lift truck is taken as an example of the working machine according to the embodiment of the present invention, and the details will be described with reference to FIGS. ,

In Fig. 1, 1 is a lift truck as a work machine Is shown. The lift truck 1 is roughly constituted by a wheel-type traveling body 2 that can be self-propelled and a boom device 2 2 that is provided on the traveling body 2 so as to be raised and lowered. Yes. The lift truck 1 is used to carry the cargo handling work from the ground to a high place using the boom device 2 2 after the traveling body 2 travels and self-travels to the work place. is there. The traveling body 2 of the lift truck 1 includes a frame 3, a reinforcing plate 8, a front wheel 13, a rear wheel 15, an engine 16, an oil pressure pump 17, a hydraulic oil tank 20, and a cap 21. Etc.

3 is a frame that serves as a base for 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. 5, roughly composed of right vertical plate 6, support base 7, etc.

Reference numeral 4 denotes a bottom plate constituting the bottom portion of the frame 3, and the bottom plate 4 is formed as a plate body extending in the front and rear directions using a steel plate material having a predetermined thickness. The bottom plate 4 is located on the front side and supports a front wheel support portion 4A that supports a later-described front wheel 1 3, the rear wheel support portion 4B is located on the rear side and supports a rear wheel 15 that will be described later, An intermediate front plate portion 4 C, an intermediate middle plate portion 4 D, and an intermediate rear plate portion 4 E provided between the front wheel support portion 4 A and the rear wheel support portion 4 B are roughly configured.

In addition, the middle middle plate 4D and middle rear plate 4E are connected to the left vertical plate 5 in order to avoid the hydraulic oil tank through hole 5C and the right vertical plate 6 pump through hole 6A. , It is arranged at intervals in the rear direction. As a result, the pipe connection of the hydraulic oil tank 20 inserted into the hydraulic oil tank through hole 5 C of the left vertical plate 5 is connected between the intermediate intermediate plate 4 D and the intermediate rear plate 4 E. Part 2 OA and hydraulic pump 1 7 inserted into pump through hole 6 A of right vertical plate 6 Has been placed. The middle rear plate 4 E is the middle middle plate

Located higher than 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 material having a predetermined thickness and is formed so as to rise substantially vertically and extend in the front-rear direction. ing . Further, a pair of support brackets 5 A are provided at an intermediate position of the ¾c vertical plate 5 so as to be separated from each other in the front-rear direction. B is installed. And each support bracket ブラ 5 A, 5

A cap 21 is mounted on B, and a hydraulic oil tank through hole is installed in the middle of the left vertical plate 5 in the front and rear direction as shown in Fig. 3. 5 C is provided, and the hydraulic oil tank through hole 5 C has a hydraulic oil tank described later.

20 0 pipe connection 2 0 A is threaded. The hydraulic oil inlet hole 5 C is provided at a position facing the pump inlet hole 6 A.

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 arranged on the right side of the left vertical plate 5 in a substantially parallel manner with a predetermined interval. The right vertical plate 6 is formed using a steel plate material having a predetermined thickness, like the left vertical plate 5, and is formed so as to rise substantially vertically and extend in the front-rear direction. Further, on the right side of the right vertical plate 6, an engine 16, a hydraulic pump is provided at a middle position in the front and rear directions via a support base 7 described later.

1 7 etc. are installed, and a fuel tank (not shown) is installed on the rear side.

Further, as shown in FIG. 4, a pump through hole 6 A as an equipment through hole is formed at an intermediate position in the front-rear direction of the right vertical plate 6. The pump through hole 6A is disposed at a position opposite to the hydraulic oil tank through hole 5C. And As shown in Fig. 2 and Fig. 3, the pump through hole 6 6 has a large opening so that it can pass through a hydraulic pump 17 attached to the engine 16 described later. As shown in FIG. 5, a reinforcing plate 8 (described later) is attached to the left side of the pump so as to surround the pump push-through hole 6A at the upper position of the pump pass-through hole 6Α.

Here, the right vertical plate 6 constituting the frame 3 is provided with a pump passage hole 6A that opens greatly at the front and rear intermediate positions, so that the strength is increased at the front and rear intermediate positions. descend . For this reason, a reinforcing plate 8 (described later) is provided at an intermediate position in the front and rear directions of the right vertical plate 6.

Reference numeral 7 denotes a square frame-like support base (see FIGS. 2 and 3) attached to the right side of the vertical plate 6, and the support base 7 is located between the front wheel 13 and the rear wheel 15. It is attached to the right vertical plate 6 by means such as a pol-b stop at the intermediate position in the rear direction. And the support base 7 is an X engine 16, a hydraulic pump 17, a lantern 18, which will be described later, In addition to the hydraulic pump 17, each control valve (not shown) and the like may be mounted on the support base 7.

Next, 8 is a reinforcing plate that extends in the front and rear directions on the left side of the right vertical 6, and the reinforcing plate 8 is located between a saddle wheel 1 3 and a rear wheel 15 described later.刖 In the middle of the rearward direction, the right vertical plate 6 is provided in the vicinity of the punch hole 6A across the upper fj. As a result, the reinforcing plate 8 can increase the strength of the right vertical plate 6 at the position of the pump hole 6 A. Further, as shown in FIGS. 6 and 7, the reinforcing plate 8 is a body to be described later. Pole

9 and the bent plate portion 1 1 are integrally fixed to form a single W. body extending rearward along the right vertical plate 6. Reference numeral 9 denotes a main body plate constituting the main body portion of the reinforcing plate 8, and this main body plate 9 is formed by using a single steel plate material that is seamless in the front and rear directions. The main body plate 9 is composed of a front plate 9 A located on the front side, a middle plate 9 B located on the middle, and a rear plate 9 C located on the rear side, with the central portion protruding upward as a whole. It is formed in a mountain shape. The main body plate 9 is formed with a pump opening 9 D so as to avoid the hydraulic pump 1 7 at a position corresponding to the pump through hole 6 A of the right vertical plate 6 below the middle plate 9 B. . As a result, 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 D is formed in a substantially inverted U shape that opens downward, and surrounds the upper periphery of the pump through hole 6 A formed in the right vertical plate 6. Thus, the pump opening 9D can reinforce the peripheral portion of the pump through hole 6A while allowing the hydraulic pump 17 to pass through the pump through hole 6A.

On the other hand, the main body plate 9 is formed in a mountain shape (curved shape), so that it avoids surrounding equipment, piping, etc. Each can be formed with a large height dimension. As a result, the body plate

9 can increase the distance between the bent portion 10 and the bent plate portion 1 1, which will be described later.

As shown in Fig. 8, it is possible to form a large closed section structure.

Furthermore, the front plate 9 A and the rear plate 9 C of the main body plate 9 are

As shown in Fig. 6, the position of the lower end of each is different upward and downward, and the rear plate 9 C is arranged higher than the front plate 9 A by a dimensional difference G. Here, the front plate 9 A The dimensional difference G from the rear plate 9 C is set to be approximately the same as the step between the intermediate middle plate portion 4 D and the intermediate rear plate portion 4 E of the bottom plate 4. Placing the lower end of the plate 9A on the middle middle plate 4D of the bottom plate 4 and the lower end of the rear plate 9C on the middle plate 4E of the bottom plate 4 Can be positioned, and the subsequent welding work can be easily performed.

10 is a bent portion provided on the upper peripheral edge of the main body plate 9, and the bent portion 10 is configured to bend the upper peripheral edge of the main body plate 9 to the right vertical plate 6 side (right side). The main body plate 9 is formed so as to follow the chevron shape. In addition, since the bent portion 10 is formed by bending the upper peripheral edge of the main body plate 9, the strength of the upper portion of the reinforcing plate 8 can be increased. Can be reinforced.

Here, the bent portion 10 is divided into the bending margins 1 0 A and 1 0 B 1 0 C of the main body plate 9 ′ cut out as shown in FIG. After bending, welding is applied to the contact part 10 D between the bending allowances 10 A and 10 B and the contact part 10 E between the bending allowances 10 B and 10 C. It is integrally formed with the main body plate 9.

1 1 shows a bent plate portion as a bent portion fixed integrally to the right side of the main plate 9. This bent plate portion 11 is formed of a strip-shaped steel plate material having substantially the same width as the bent portion 10 '. The bent plate portion 11 is formed in a substantially inverted U shape along the pump opening 9D of the main body plate 9 by bending a plurality of portions in the length direction of the steel plate material. In addition, the bent plate portion 1 1 surrounds the upper periphery of the pump insertion hole 6 A of the right vertical plate 6 in the same manner as the pump opening 9 D of the main body plate 9, thereby forming the pump insertion hole 6 A. hydraulic While allowing the pump 17 to be inserted, the vicinity of the pump through hole 6A is reinforced.

Then, as shown in FIG. 8, the bent plate portion 11 is integrated with the main body plate 9 by pressing the end in the width direction around the pump opening 9D and applying welding means in this state. It is firmly fixed. As a result, the bending plate portion 11 can be formed by bending the lower peripheral portion of the main plate 9, thereby increasing the strength of the lower portion of the reinforcing plate 8. The right vertical plate 6 can be effectively reinforced together with the part 1 0. The reinforcing plate 8 configured in this manner is formed by bending the upper and lower peripheral portions of the main body plate 9 by the bent portion 10 and the bent plate portion 11. Then, in order to fix the reinforcing plate 8 to the right vertical plate 6, as shown in FIG. 8, the pump opening 9D of the main body plate 9 is aligned with the pump hole 6A of the right vertical plate 6. The reinforcing plate 8 is pressed against the left side of the right vertical plate 6. Next, in this state, the distal end portion of the bent portion 10 of the reinforcing plate 8 and the distal end portion of the bent plate portion 11 are joined to the left side surface of the right vertical plate 6 by welding means. As a result, the reinforcing plate 8 is fixed to the right vertical plate 6. At this time, the reinforcing plate 8 is formed by placing the front plate 9A of the main body plate 9 on the intermediate middle plate portion 4D of the bottom plate 4 and placing the rear plate 9C on the intermediate rear plate portion 4E. The right vertical plate 6 can be easily positioned at a predetermined position.

The reinforcing plate 8 can be welded to the right vertical plate 6 to form a closed cross-sectional structure having a large cross-sectional area, and the right vertical plate whose strength is reduced by the pump through hole 6A. It is possible to reinforce the intermediate position before and after 6. In addition, the right vertical plate 6 is reinforced against the torsion generated between the front wheel 1 3 and the rear wheel 15 described later by reinforcing the intermediate position in the front and rear directions with the reinforcing plate 8. The strength of frame 3 is high Can

1 2, 1 2 are the ring support for the bottom plate 4 constituting the frame 3

-, Left and right carriages projecting left and right in part 4 A

, '-Axle (shown in Fig. 2), each front axle 1 2 is m-wheel support

4 From the differential J-relay device (not shown) provided on the lower side of A, it extends to the left and right, and each front end has a front wheel.

1 3 is rotatably mounted. Then, the left and right front wheels 1 3 are steered by a steering gear device (not shown) disposed in the cap 2 1 to cause the traveling body 2 to travel straight ahead, turn left, and turn right. The left and right front wheels 1 3 are connected to a traveling hydraulic motor (not shown) as a rotation source.

Reference numerals 14 and 14 denote left and right rear axles protruding left and right on the rear wheel support 4B of the bottom plate 4 constituting the frame 3, respectively. Ends extend left and right from a differential device (not shown) provided on the lower side of the rear wheel support 4B, and a rear wheel 15 is rotatably attached to each front end. ing. Also, after 15

It is possible to steer by moving with the front wheels 1 3 by the wing device. The right rear wheel 15 is connected to a traveling hydraulic motor serving as a rotation source.

As a result, the rotation of the left and right front wheels 1 3 and the left and right rear wheels 15 is transmitted from the traveling hydraulic motor, which is the rotation source, to the respective τ-facial devices. The traveling body 2 can travel forward and backward.

1 6 is an engine as a prime mover mounted on the rear side of the support base 7 via an engine mount (not shown) (Fig.

2), the engine 16 is disposed in a horizontally placed state extending in the left and right directions. 1 7 is a hydraulic pump connected in series to the left side of the engine 16, and the hydraulic pump 1 7 is connected to the hydraulic oil piping 20 via the hydraulic oil piping 20 (not shown). The hydraulic pump 17 connected to the OA is driven by an engine 16 to operate a hydraulic oil tank 2 described later.

0 Hydraulic oil is supplied to the boom motor 2 2 etc., where hydraulic pump 1 7 and engine 1 are supplied.

Before assembling 6 to frame 3, as shown in Fig. 3, the hydraulic pump 17 is mounted on the support 7 together with the engine 16 in series in the left-right direction. It is placed in a separate place from Lame 3. Then, by removing the support base 7 to the right vertical plate 6, as shown in FIGS. 2 and 3, the hydraulic pump

1 7 is passed through the pump through hole 6 A of the right vertical plate 6 and is disposed between the left and right vertical plates 5 and 6.

1 8 is a Raje overnight arranged near the front side of the support base 7 FUJE overnight 1 8 is for cooling the engine coolant, and 1 9 is superimposed on the front side of the Raje overnight 1 8 In the oil cooler provided, the oil cooler 19 cools the working oil returned to the working oil bundle 20.

20 is a hydraulic oil tank (shown in Fig. 2) located in the middle of the front and rear direction of frame 3 and attached to the left vertical plate 5. The hydraulic oil tank 20 is connected to its pipe connection. 2 OA is installed in the left vertical plate 5 with the hydraulic oil tank through hole 5 C passed. And the hydraulic oil tank 20 stores hydraulic oil and is connected to the piping connection. 20 A is connected to hydraulic pump 1 7 and oil cooler 1 9 via hydraulic oil piping (not shown)

This place has a pump hole 6A and a hydraulic oil tank hole 5

Since it is provided at a position opposite to C, the hydraulic oil tank Piping connection 2 of OA 20 OA can be connected to the hydraulic pump 17 and the oil cooler 19 with a short length of piping.

2 1 is a cap located between the front wheel 1 3 and the rear wheel 1 5 on the left side of the frame 3, and the cap 2 1 is formed as a hollow structure that forms the cab. The left vertical plate 5 is supported on support brackets 5A and 5B. Further, a steering device, a driver's seat, an operation lever, and the like (not shown) are disposed in the cab 21.

Next, 2 2 is a boom device for carrying a cargo handling work for transporting a load from the ground to a high place, and the boom device 2 2 is provided at the rear portion of the traveling body 2 so as to be raised and lowered. In addition, the boom device 2 2 is connected to the boom 2 3 whose base end side is pin-coupled to the rear upper end side of the frame 3 and whose front end extends to the front side, It is roughly composed of a fork and other cargo handling equipment 24.

Here, the boom 23 is configured as a multi-stage telescopic boom, and can be expanded and contracted by the boom telescopic cylinder 2 3 A. The boom 3 can be raised by extending and retracting a boom hoisting cylinder 25 provided between the boom 3 and the frame 3.

Re oice track 1 according to this embodiment has the above-described configuration, then, _c which will be described which performs cargo handling using re oice track 1

First, a load is loaded on the cargo handling equipment 2 4 of the boom device 2 2, and the traveling body 2 is moved to the work site. Then, an operator in the cab 2 1 operates the operation lever for the boom device 2 2. As a result, the boom 2 3 is raised by the boom down cylinder 2 5, and the boom 2 3 is extended by the boom extendable cylinder 2 3 A. It can carry cargo handling work to carry the loaded cargo to the high place ^^

In addition, when the traveling body 2 is traveling or when the load is transported by the boom device 2 2, for example, a load is applied to twist the frame 3. However, since the frame 3 is strengthened 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 bowing plate 8, and the reinforcing plate 8 is connected to the vicinity of the pump penetration hole 6 A. Is formed by a plate body that extends forward and backward along the right vertical plate 6 at the peripheral part

,

The intermediate position in the rearward direction of the right vertical plate 6 provided with the pump through-hole 6A can be reinforced by the reinforcing plate 8, and the strength of the frame 3 can be increased. In addition, since the reinforcing plate 8 is formed as a single plate, it can be easily manufactured with a small number of parts and processing steps, improving productivity and reducing manufacturing costs. .

The reinforcing plate 8 is attached to 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 with a large closed space between them. As a result, the reinforcing plate 8 can further increase the strength of the frame 3 by the closed cross-sectional structure. Alternatively, the frame 3 and the reinforcing plate 8 can be formed of a thin plate material, and the weight can be reduced and the manufacturing cost can be reduced.

On the other hand, even when the pump through hole 6A 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 bent at the lower peripheral edge. Since the plate part 1 1 is provided, the strength of the body plate 9, that is, the strength of the right vertical plate 6 is effective. It can be increased. In this case, since the reinforcing plate 8 is disposed across the upper side of the pump hole 6A, even if the load of the cap 21, the boom device 22 or the like acts from the upper side of the right vertical shaft 6, The strength of the right vertical plate 6 can be further increased.

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

Further, since the reinforcing plate 8 is provided at an intermediate position before and behind the frame 3 positioned between the transport 13 and the rear wheel 15, the torsional deformation of the frame 3 generated at this intermediate position is provided. It is also possible to improve durability and credibility, and if the pump through hole 6A of the right vertical plate 6 and the hydraulic oil inlet hole 5C of the left vertical plate 5 are The hydraulic oil tank 20 can be connected to the hydraulic pump 17 and the oil tank 19 using the short pipe connection 20 A. If the hydraulic oil tank 20 is connected to the hydraulic pump 17 and the oil cooler 19, the workability can be improved.

In the embodiment, the m strong plate 8 is formed by bending a part of the main body plate 9 to form a bent portion 10, and welding the bent plate portion 11 to be integrated with the main body plate 9. Thus, the case of forming a single plate was described as an example. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 10, bending (pressing) is applied to one plate material. Thus, the reinforcing plate 4 1 may be formed. That is, the reinforcing plate 4 1 according to the first modification forms an upper bent portion 4 3 by bending on the upper side of the main plate 4 2, and the main plate 4 4

The lower bent portion 4 4 may be formed on the lower side of 2 by bending.

In the embodiment, the right vertical plate constituting the frame 3

However, the present invention is not limited to this. For example, FIG. 2 shows a configuration in which a reinforcing plate 8 is provided and the reinforcing plate 8 increases the strength around the pump hole 6A of the right vertical plate 6. In addition to the reinforcing plate 8 of the right vertical plate 6, the left vertical plate 5 of the frame 3 is formed in almost the same manner as the reinforcing plate 8, as in the second modification example indicated by a chain line inside. The reinforcing plate 3 1 may be provided. In this case, the reinforcement plate 3 1 can be used to increase the strength around the hydraulic oil tank through hole 5 C of the left vertical plate 5, and the reinforcement plate 8 of the right vertical plate 6 has been eliminated, and the left vertical plate 5 It is also possible to provide a reinforcing plate 3 1 alone.

Further, in the embodiment, the lift truck 1 in which the cargo handling tool 2 4 for handling work is provided on the tip side of the boom device 2 2 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 tip side of the boom device.

Claims

The scope of the claims

1. A traveling body having a frame extending in the front and rear directions, and in which a prime mover, hydraulic equipment, and the like are mounted, and wheels are provided in front and rear positions, and the traveling body is provided. In a work machine comprising a boom device,

The HU frame consists of at least a bottom and a left and right vertical plate located on both sides and extending in the front-rear direction.

補強 At least one of the left and right vertical plates constituting the frame is provided with a reinforcing plate consisting of one plate body force extending in the front-rear direction along the vertical plate. A work machine that is characterized by its success.

2. The working machine according to claim 1, wherein the one vertical plate is provided with a device through hole through which the hydraulic device is passed, and the reinforcing plate is arranged in the vicinity of the device through hole. .

3. The work machine according to claim 2, wherein the reinforcing plate is arranged so as to extend forward and backward across the upper side of the device through hole.

4. The peripheral portion of the reinforcing plate is provided with a bent portion that bends to the vertical side of the frame, and the tip of the bent portion is fixed to the vertical plate. Work machine.

5. The prime mover and a hydraulic pump, which is one of the hydraulic devices, are connected in series and placed left and right with respect to the vertical plate, and the left and right vertical plates constituting the frame. At least one of the vertical plates is provided with a pump through hole through which the hydraulic pump passes when the prime mover and the hydraulic pump are mounted, and the reinforcing plate is disposed in the vicinity of the pump through hole. The work machine according to claim 1, which is configured.

6. The other vertical plate of the left and right vertical plates constituting the frame has a hydraulic oil flange through hole through which a part of the hydraulic oil tank is inserted at a position facing the pump through hole. The working machine according to claim 5, wherein the working machine is configured to connect the hydraulic pump passed through the pump through hole and the hydraulic oil tank.

7 • The working machine according to claim 6, wherein the other vertical plate is provided with another reinforcing plate extending in the rearward direction along the hydraulic oil tank through hole.

8. The work machine according to claim 12, wherein the reinforcing plate is fixed to the vertical plate in a state in which the lower end of the reinforcing plate is placed on the bottom plate in a U-position.

9 • The working machine according to claim 1 2 or 3, wherein the reinforcing plate is arranged at an intermediate position in the front and rear direction of the frame between the front and rear wheels.