JP2023006713A - Excavator - Google Patents

Abstract

To suppress the load due to vibration on a hood that covers a prime mover.SOLUTION: An excavator according to one aspect of the present invention has a lower traveling body, an upper rotating body rotatably mounted on the lower traveling body, a counterweight provided at a rear of the upper rotating body, a prime mover provided on the upper rotating body, a hood that covers the prime mover, and a rear frame supporting the hood. The rear frame is placed in front of the counterweight.SELECTED DRAWING: Figure 7

Description

The present invention relates to excavators.

An excavator has an engine, a counterweight, etc., in addition to a cabin in which an operator boards, on an upper revolving body. Furthermore, excavators generally have a structure in which the power chamber including the engine is covered with an exterior cover in order to isolate the power chamber from the outside environment.

By the way, there are cases where maintenance is required for the engine or the like in the power room. Since it is inefficient to remove the exterior cover at that time, a technique of providing a hood having an opening/closing structure has been proposed in order to perform maintenance in the power room containing the engine.

WO2011/093175

In the technique described in Document 1, a hood that covers an engine (an example of a prime mover) opens and closes in the front-rear direction about a hinge provided on the long side of the counterweight as a rotation center. Thus, the hood is attached at one end to the counterweight and at the other end to a given frame in front of the counterweight. By the way, in an excavator, the counterweight and the predetermined frame belong to different vibration systems. Therefore, if the hood is installed so that one end is attached to the counterweight and the other end is attached to a given frame, vibrations from the counterweight can cause excessive loads on the hood, the hood hinges, or the given frame, etc. might give.

One aspect of the present invention provides a technique for reducing the load applied to members constituting a shovel.

An excavator according to an aspect of the present invention includes a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, a counterweight provided at the rear portion of the upper revolving body, and a prime mover provided on the upper revolving body. , a hood that covers the prime mover, and a rear frame that supports the hood, the rear frame being positioned in front of the counterweight.

One aspect of the present invention suppresses the load due to vibration on the hood that covers the prime mover.

FIG. 1 is a side view of the excavator according to the embodiment. 2 is a top view schematically showing an upper revolving body of the excavator of FIG. 1; FIG. FIG. 3 is a perspective view showing the upper rotating body according to the embodiment, viewed from the left rear upper side. FIG. 4 is a perspective view showing the frame structure of the upper rotating body according to the embodiment, viewed from the left rear upper side. FIG. 5 is a perspective view of the upper rotating body according to the embodiment, viewed from below. FIG. 6 is a perspective view showing the lower portion of the rear frame according to the embodiment. FIG. 7 is a perspective view showing the frame structure near the hood according to the embodiment. FIG. 8 is a perspective view showing the structure inside the hood according to the embodiment. FIG. 9 is a perspective view showing the structure near the curved portion of the hood according to the embodiment.

Non-limiting exemplary embodiments of the invention will now be described with reference to the drawings. In addition, in each drawing, the same or corresponding configurations are denoted by the same or corresponding reference numerals, and description thereof may be omitted. Also, the drawings are not intended to show relative size ratios between members or components unless specified otherwise. Accordingly, specific dimensions can be arbitrarily determined by those skilled in the art in light of the following non-limiting embodiments.

In addition, the embodiments described below are intended to illustrate rather than limit the present invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention. Not exclusively.

FIG. 1 is a side view of a shovel according to this embodiment. As shown in FIG. 1 , the excavator 100 includes a lower traveling body 1 , an upper revolving body 2 , a cabin 3 , a boom 4 , an arm 5 and a bucket 6 .

The upper revolving body 2 is rotatably mounted on the lower traveling body 1 via a revolving mechanism (not shown). The cabin 3 is provided on the left front portion of the upper revolving body 2 . A driver's seat is provided inside the cabin 3 . The boom 4 is rotatably provided at the front center of the upper swing body 2 . Arm 5 is rotatably provided at the tip of boom 4 . Bucket 6 is an example of an end attachment, and is rotatably provided at the tip of arm 5 . Furthermore, a bucket 6 is rotatably connected to the tip of the arm 5 . A top cover 2b is attached to the top of the housing 2a. In the present embodiment, the top cover 2b is divided into three parts in the vehicle width direction (Y-axis direction), and only the center part thereof is configured to be rotatable (openable and closable) as a hood, but the entirety is rotatable (openable and closable). may be configured to allow Therefore, in the following, "hood" refers to a part that can be pivoted (opened and closed), whether partly or wholly.

FIG. 2 is a top view schematically showing the upper revolving body 2 of the excavator 100. As shown in FIG. As shown in FIG. 2, a prime mover installation space 7 is formed in the housing 2a of the upper revolving body 2, and a diesel engine 8 and a generator 8a are installed as prime movers in the prime mover installation space 7. As shown in FIG. A cooling fan 12 is installed on the Y1 side of the diesel engine 8 , and a heat exchanger unit 13 including a radiator and the like is installed on the Y1 side of the cooling fan 12 . In the present embodiment, an example in which the diesel engine 8 is used as the prime mover of the excavator 100 is shown, but the prime mover is not limited. An internal combustion engine may also be used. Furthermore, an electric motor may be used as the prime mover of the shovel. In that case, the hydraulic pump 14 may be driven by an electric motor driven by electric power from the power storage device. A fuel cell, a lithium ion battery, or the like may be used as the power storage device. Also, the excavator is not limited to one prime mover, and may be a combination of two or more prime movers such as an internal combustion engine and an electric motor.

A hydraulic pump 14 is installed on the Y2 side of the diesel engine 8 . Note that the rotational force of the diesel engine 8 is transmitted to the generator 8a and the cooling fan 12 via the belt 8b, and to the hydraulic pump 14 via the transmission.

An oil pan (not shown) for storing engine oil is provided in the lower part of the diesel engine 8 . An oil level gauge 8d for measuring the amount of engine oil is attached near the generator 8a of the diesel engine 8. As shown in FIG.

In addition, the diesel engine 8 sucks outside air through an air filter 9a and an intake pipe 9b that are installed outside the motor installation space 7 . Furthermore, an exhaust pipe 9c is connected to the diesel engine 8, and an exhaust gas treatment device 10 for purifying nitrogen oxides (hereinafter referred to as NOx) in the engine exhaust gas is installed downstream of the exhaust pipe 9c. .

In this embodiment, the exhaust gas treatment device 10 is a urea selective reduction type NOx treatment device using urea water as a reducing agent. The exhaust gas treatment device 10 injects urea water upstream of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and promotes this reduction reaction with the reduction catalyst. to render NOx harmless.

The urea water tank 20 is a container for storing urea water, and is arranged on the opposite side (Y2 side) of the cabin 3 with the boom 4 interposed in the upper swing structure 2 . A fuel tank 19 is arranged behind the urea water tank 20 (X2 side), and a hydraulic oil tank 18 is arranged behind the fuel tank 19 (X2 side). Also, the hydraulic oil tank 18 , the fuel tank 19 , and the urea water tank 20 are installed outside the prime mover installation space 7 . Also, the urea water tank 20 is connected to the exhaust gas treatment device 10 via a urea water hose 69, a urea water supply pump 70, and the like.

FIG. 3 is a perspective view showing the upper revolving body 2 as seen from the left rear upper side. 3, illustration of the cabin 3 mounted on the cabin mounting portion 2d and the boom 4 connected to the boom connecting portion 2e is omitted. As shown in FIG. 3, the counterweight 2c is provided at the rear portion (X2 direction side) of the upper rotating body 2. As shown in FIG.

Above the motor installation space 7 is covered with a top cover 2b shown in FIG. The upper surface cover 2b includes a first plate portion 21 on the rear side, a second plate portion 22 on the front side, and a third plate portion 23 on the upper surface. The first plate portion 21 has frame plates 211 , 212 and 213 . The frame plates 211, 212, 213 are arranged in series in the vehicle width direction (Y1-Y2 direction).

The upper surface cover 2b shown in FIG. 3 has an opening above the motor installation space 7 (Z1 side), and a third plate portion 23 is provided so as to close this opening. The third plate portion 23 is divided into three parts in the vehicle width direction (Y1-Y2 direction) and has a radiator cover 231, a hood 232, and an exhaust gas treatment device cover 233.

The radiator cover 231 is provided above the heat exchanger unit 13 including the radiator and the like. Radiator cover 231 is formed in a plate shape. For example, when performing maintenance on the heat exchanger unit 13, an operator can attach and detach the radiator cover 231 by attaching and detaching bolts (not shown).

The exhaust gas treatment device cover 233 is provided above the exhaust gas treatment device 10 . The exhaust gas treatment device cover 233 is formed in a plate shape. A tail pipe 11 is provided at the rear portion of the exhaust gas treatment device cover 233 . For example, when performing maintenance on the exhaust gas treatment device 10, an operator can attach and detach the exhaust gas treatment device cover 233 by attaching and detaching bolts (not shown). Also, the exhaust gas treatment device cover 233 is provided at a position higher than the hood 232 when the hood 232 is closed.

A hood 232 is provided above the diesel engine 8 so as to cover the diesel engine 8 . The hood 232 is rotatably (openable and closable) attached to the frame plate 212 by hinges 31a and 31b. In FIG. 3, the direction of rotation when the hood 232 is opened is indicated by an outline arrow. For example, when an operator measures the amount of engine oil with the oil level gauge 8d, the hood 232 can be opened and closed around the hinges 31a and 31b.

FIG. 4 is a perspective view showing the frame structure of the upper revolving body 2 as seen from the left rear upper side. In the example shown in FIG. 4 , the upper revolving body 2 includes a revolving frame 30 .

The pivot frame 30 includes a central right longitudinal member 30a and a central left longitudinal member 30b. The revolving frame 30 is a frame for installing the boom 4 and mounting an object on the upper revolving structure 2 . The revolving frame 30 extends in the Y1 direction from the central left longitudinal member 30b and also extends in the Y2 direction from the central right longitudinal member 30a in order to mount an object on the upper revolving body 2 . The swing frame 30 also has a bottom plate 30c between the central right vertical member 30a and the central left vertical member 30b.

The central right longitudinal member 30a is a member extending in the X-axis direction. Also, the central right vertical member 30a is a member that becomes longer (higher) in the Z1 direction as it goes in the X1 direction. Holes 30g and 30h for fixing (for example, bolting) the counterweight 2c are provided on the upper surface (surface in the Z1 direction) of the central right vertical member 30a.

Similarly, the central left longitudinal member 30b is also a member extending in the X-axis direction. In addition, the center left vertical member 30b is a member that becomes longer (higher) in the Z1 direction as it goes in the X1 direction. Holes 30e and 30f for fixing (for example, bolting) the counterweight 2c are also provided on the upper surface (surface in the Z1 direction) of the central left vertical member 30b.

In the upper revolving body 2, an air cleaner chamber 80 provided above the revolving frame 30 is formed on the left side (Y1 side) of the central left vertical member 30b. The section in which the air cleaner chamber 80, the heat exchanger unit 13, etc. are mounted is a space formed by the house frames 81, 82, 83, etc., the top plate 84, and the plate members 85, 86. , the air filter 9a and the like are accommodated. Note that the house frame is a frame that constitutes a building that is arranged on the revolving frame 30 .

In addition, in the upper revolving body 2, on the right side (Y2 side) of the central right vertical member 30a, a section in which the exhaust gas treatment device 10 and the like are mounted is provided. Therefore, on the right side (Y2 side) of the central right vertical member 30a, a space formed by the house frames 71, 72, 73, 74, 75, 76, and 77 and the plate members 61, 62, and 63 is provided with an exhaust gas treatment unit. The device 10 and the like are accommodated. Furthermore, house frames 77, 78, 79 for supporting the exhaust gas treatment device cover 233 are formed above the space.

Next, the vicinity of the center of the revolving frame 30 in which the diesel engine 8 is housed will be described. As described above, the bottom plate 30c is provided near the center of the revolving frame 30 .

A rear frame 41 extending upward (Z1 direction) is provided on the rear side (X2 side) of the bottom plate 30c. The rear frame 41 is a member arranged in front of the counterweight 2c and provided for supporting the hood 232. As shown in FIG.

The hood 232 is connected to the rear frame 41 in the excavator 100 according to this embodiment. Next, the configuration around the rear frame 41 and the rear frame 41 will be described.

In the illustrated example, the rear frame 41 is a perforated plate member. The material of the rear frame 41 may be any material that can ensure the strength to support the hood 232. For example, steel can be used. Further, the rear frame 41 is provided with a rib 32 extending in the vehicle width direction (Y1-Y2 direction) and a reinforcing plate 35 . The rib 32 is provided on the rear side (X2 side) surface of the rear frame 41 and supports the force acting on the rear frame 41 in the vehicle width direction (Y1-Y2 direction). The reinforcing plate 35 is provided on the front side (X1 side) surface of the rear frame 41 and supports the force acting on the rear frame 41 in the vehicle width direction (Y1-Y2 direction).

Below the rear frame 41, it is fixed by bolting to a plate member 30d formed between the central right vertical member 30a and the central left vertical member 30b. In the example shown in FIG. 4, the rear frame 41 is fixed to the plate member 30d with four bolts 44 in the vicinity of the central right vertical member 30a. Similarly, the rear frame 41 is fixed to the plate member 30d with four bolts in the vicinity of the central left vertical member 30b.

The plate member 30d of the revolving frame 30 is provided vertically between the central right vertical member 30a and the central left vertical member 30b. The plate member 30d may be welded or bolted to each of the central right vertical member 30a and the central left vertical member 30b. The height of the plate member 30d (the length in the Z1-Z2 direction) substantially matches the heights of the center right vertical member 30a and the center left vertical member 30b near the plate member 30d.

The rear frame 41 is provided with support members 41a and 41b. The support members 41a and 41b are members extending in the X2 direction from the surface of the rear frame 41 facing the counterweight 2c. The rear frame 41 also has supporting members 41a and 41b, and supports the frame plate 212 via the supporting members 41a and 41b.

Further, support members 41c and 41d are provided at the lower portion of the rear frame 41. As shown in FIG. The support members 41 c and 41 d are formed so as to come into contact with the plate member 30 d of the revolving frame 30 provided on the upper revolving body 2 . In this embodiment, the support members 41 c and 41 d are part of the rear frame 41 , are made of the same material as the rear frame 41 , and are integrated with the rear frame 41 . A detailed configuration of the support members 41c and 41d will be described later.

Further, on the bottom plate 30c, a center frame 42 (an example of a first frame) is mounted on the bottom plate 30c at a position behind (X2 side) the pivot shaft near the center of the pivot frame 30 and forward (X1 side) of the rear frame 41. ) is provided.

In the illustrated example, the center frame 42 is a frame member extending upward (Z1 direction). Any material can be used for the center frame 42 as long as it can ensure the strength to support the force transmitted by the front and rear frames 43a and 43b, which will be described later. For example, steel may be used.

The center frame 42 is fixed to each of the central right vertical member 30a and the central left vertical member 30b via a support member 51. As shown in FIG. The central right vertical member 30a and the central left vertical member 30b are members that become longer (higher) in the Z1 direction as they go in the X1 direction. Therefore, the central right vertical member 30 a and the central left vertical member 30 b can fix the center frame 42 at a portion having a height higher than the portion near the rear frame 41 .

Further, the center frame 42 is provided with two ribs 33 and 34 extending in the vehicle width direction (Y1-Y2 direction). Each of the rib 33 and the rib 34 is provided at a different position in the vertical direction (Z1-Z2 direction). For example, the rib 33 is provided near the bottom plate 30c, and the rib 34 is provided above the rib 33 (in the Z1 direction). The ribs 33 and 34 support forces acting on the center frame 42 in the vehicle width direction (Y1-Y2 direction).

Front and rear frames are provided between the center frame 42 and the rear frame 41 . In this embodiment, an example in which two front and rear frames 43a and 43b are provided will be described, but the number may be three or more, or one.

The front and rear frames 43 a and 43 b are pipe members extending in the X-axis direction, and connect the top cover 46 and the center frame 42 with the rear frame 41 . In this embodiment, an example in which the front and rear frames 43a and 43b are made of pipe material will be described, but the material is not limited to pipe material and may be made of a solid round bar. Moreover, the material of the front and rear frames 43a and 43b may be any material that can ensure strength, and for example, steel may be used. With this configuration, the force acting on the rear frame 41 in the front-rear direction (X1-X2 direction) is supported by the front-rear frames 43a, 43b and the center frame 42 connected via the top cover 46. FIG.

A top cover 46 is provided at the upper end (the end in the Z1 direction) of the center frame 42 . The upper surface cover 46 is connected to the ends of the front and rear frames 43a and 43b and functions as a foothold for the operator. For example, the operator can perform various operations by opening and closing the hood 232 while resting on the top cover 46 .

In the excavator 100 according to this embodiment, the front and rear frames 43a and 43b, the center frame 42, the rear frame 41, the top cover 46 and the bottom plate 30c form a box (rectangular parallelepiped) frame structure. As a result, forces acting on any one or more of the front and rear frames 43a and 43b, the center frame 42, the rear frame 41, and the bottom plate 30c are supported by other components forming the frame structure. .

Furthermore, since the front and rear frames 43a and 43b, the center frame 42, the rear frame 41, the top cover 46 and the bottom plate 30c constitute a vibration system, the above-mentioned frame structure is different from other components such as the counterweight 2c and the hood 232. It is possible to suppress the application of vibration to the

By connecting the hood 232 to the rear frame 41, the hood 232 is incorporated into a vibration system composed of the front and rear frames 43a, 43b, the center frame 42, the rear frame 41, the top cover 46, and the bottom plate 30c. As a result, the hood 232 is less likely to be affected by vibrations of the counterweight 2c. Also, the force acting on the hood 232 is supported by the combination of the front and rear frames 43a and 43b, the center frame 42, the rear frame 41, the top cover 46, and the bottom plate 30c. Concentration of the load on only one of the frame 41, the top cover 46, and the bottom plate 30c can be suppressed.

FIG. 5 is a perspective view of the upper revolving body 2 as seen from below. For example, when an operator crawls under the upper revolving body 2 to perform maintenance on the upper revolving body 2, the operator can visually recognize the lower surface of the upper revolving body 2 as shown in FIG.

As shown in FIG. 5, on the lower surface of the upper revolving body 2 of the excavator 100, an opening ZZ is formed between the bottom plate 30c included in the revolving frame 30 and the counterweight 2c, which is accessible by the operator. ing. Bolts 44 and 45 (an example of engaging portions) that fasten (engage) the rear frame 41 to (the plate member 30d that is a part of) the revolving frame 30 are provided near the opening ZZ. It is Therefore, the operator can attach and detach the bolts 44 and 45 that fasten the rear frame 41 through the opening ZZ.

For example, a situation may arise in which the rear frame 41 needs to be replaced. In such a situation, if the rear frame 41 cannot be replaced without removing the counterweight 2c, the burden on the operator increases. On the other hand, in this embodiment, with the above-described configuration, the rear frame 41 can be attached and detached without removing the counterweight 2c, so that the burden on the operator can be reduced.

FIG. 6 is a perspective view showing the lower portion of the rear frame 41 according to this embodiment. As shown in FIG. 6, the support members 41c and 41d are members protruding in the X2 direction from the rear surface of the rear frame 41 (the surface facing the counterweight 2c). The lower end portions (sides in the Z2 direction) of the support members (an example of the support portion) 41c and 41d are formed in a convex shape. The tip portions of the convex shapes formed on the support members 41c and 41d are formed so as to be in contact with the upper end portion (side in the Z1 direction) of the plate member 30d. As a result, when the rear frame 41 is attached from above the excavator 100, the tip portions of the support members 41c and 41d contact the upper end portion of the plate member 30d, thereby positioning the rear frame 41 with respect to the plate member 30d. can be done.

That is, the rear frame 41 is supported by the bolts 44 and 45 fastened to the plate member 30d, and is also supported from the upper end of the plate member 30d via the support members 41c and 41d provided on the rear frame 41. ing.

The rear frame 41 is fixed to the plate member 30d of the revolving frame 30 with bolts. load increases. Therefore, in this embodiment, the rear frame 41 is provided with the support members 41c and 41d. As a result, the weight of the rear frame 41 (vertical shear load) is applied to the bolts and the upper ends of the plate members 30d that are in contact with the support members 41c and 41d. With this configuration, the load on the bolt can be reduced.

That is, in the excavator 100 according to this embodiment, the load applied to the plate member 30d that supports the rear frame 41 can be reduced, and the stability of the rear frame 41 can be improved.

FIG. 7 is a perspective view showing the frame structure near the hood 232 according to this embodiment. As shown in FIG. 7, the front and rear frames 43a and 43b are fixed to the rear frame 41 by bolting.

A handle 92 is provided on the hood 232 . The operator can grip the handle 92 and open and close the hood 232 in the vertical direction (Z1-Z2 direction) around the hinges 31a and 31b.

A damper mechanism 91 is provided between the hood 232 and the rear frame 41 . Therefore, since the damper mechanism 91 functions when the hood 232 is opened and closed around the hinges 31a and 31b, the damper mechanism 91 can prevent the hood 232 from opening and closing sharply. Therefore, the damper mechanism 91 can improve safety when the operator opens and closes the hood 232 .

Further, the excavator 100 according to this embodiment is provided with a support member 93 between the frame plate 212 and the rear frame 41 . The shovel 100 according to this embodiment can improve the strength of the frame plate 212 by the support member 93 .

A plurality of ribs (for example, ribs 95 and 96) are provided inside the hood 232 . Hood 232 may be strengthened by a plurality of ribs (eg, ribs 95, 96).

Next, the structure of the hood 232 is described. FIG. 8 is a perspective view showing the structure inside the hood 232. As shown in FIG.

As shown in FIG. 8 , hood 232 is formed to include top surface portion 301 , curved portion 302 and side surface portion 303 . The hood 232 is formed so as to include the curved portion 302 by bending or the like from a sheet of plate material.

Further, the hood 232 includes ribs 95, 96, 97a, 97b extending in the front-rear direction (X1-X2 direction) and ribs 98, 99 extending in the vehicle width direction (Y1-Y2 direction). installed inside.

The rib 98 is made of L-shaped steel, for example, and the rib 99 is made of hat-shaped steel, for example. Hat-shaped steel is a steel material with a hat-shaped cross section.

The ribs 97a and 97b are made of hat-shaped steel. The ribs 97a and 97b may be made of a material other than hat-shaped steel as long as the ribs 97a and 97b have sufficient strength to support the hood 232 .

A mounting portion 91a for mounting the damper mechanism 91 is provided on the rib 97a. The rib 97b is provided with an attachment mechanism 94 for attaching a tension bar (not shown) that holds the hood 232 open.

The ribs 95 and 96 are formed along the top surface portion 301 , the curved portion 302 and the side surface portion 303 . Next, specific shapes of the ribs 95 and 96 will be described.

FIG. 9 is a perspective view showing the structure of the hood 232 in the vicinity of the curved portion 302. As shown in FIG. As shown in FIG. 9, the rib 95 is formed by combining three ribs 95a, 95b, and 95c and then spot-welding them to the inner surface of the hood 232. As shown in FIG. Similarly, the rib 96 is formed by combining three ribs 96 a , 96 b , 96 c and then spot-welding them to the inner surface of the hood 232 . The ribs 95a, 95b and 95c and the ribs 96a, 96b and 96c are made of hat-shaped steel.

A hat-shaped steel can overlap another hat-shaped steel with different dimensions. Therefore, the rib 95b is formed with a size large enough to overlap with the ribs 95a and 95c. Similarly, the rib 96b is also formed with a size large enough to overlap with the ribs 96a and 96c.

In this embodiment, the operator attaches the rib 95b bent along the curved portion 302 so as to overlap each of the rib 95a provided on the top surface portion 301 and the rib 95c provided on the side surface portion 303. , hood 232, ribs 95b, and ribs 95a are spot welded, and hood 232, ribs 95b, and ribs 95c are spot welded together.

The excavator 100 according to the present embodiment is compared with an excavator having a structure in which bent ribs are connected at the connection between the top surface portion and the side surface portion of the top cover. In a shovel having a structure that connects bent ribs, for example, L-shaped steel is used for the ribs, whereas hat-shaped steel is used for the ribs 95 and 96 in the shovel 100 according to the present embodiment. In the case of a structure that connects bent ribs, I-type butt welding or fillet welding is used to connect ribs of L-shaped steel. Spot welding is possible by attaching the steel so that it overlaps. When the hat-shaped steel ribs 95 and 96 are attached so as to be overlapped and spot-welded as in the present embodiment, compared to the case where the ribs of the L-shaped steel are connected by I-type butt welding or fillet welding, When the hood (for example, the hood 232) is deformed, it is possible to suppress the load from being applied to the creases and welded portions, and to sufficiently exhibit the rigidity of the ribs.

It should be noted that the curvature radius of the curved portion 302 according to the present embodiment is set to an appropriate value according to the mode. For example, it is conceivable that the radius of curvature of the curved portion 302 is within the range of bends that can be achieved by the hat-shaped steel forming the ribs 95b.

Next, a process of attaching the ribs 95 to the hood 232 will be described. First, an operator spot-welds the rib 95 a together with the top surface portion 301 and spot-welds the rib 95 c having the same dimensions as the rib 95 a to the side surface portion 303 . Thereafter, the operator arranges the rib 95b, which is larger than the ribs 95a and 95c, along the curved portion 302 so as to partially overlap the ribs 95a and 95c. The curved portion 302 is spot-welded. Further, the operator spot-welds the ribs 95a, 95b, and top surface portion 301 together, and spot-welds the ribs 95c, 95b, and side portions 303 together.

In this embodiment, spot welding is used as a welding technique for the ribs 95 . Spot welding is a technique in which superimposed metal members (for example, ribs, a top surface, etc.) are sandwiched between the tips of electrodes and heated and welded. In this embodiment, the operator spot welds between the rib 95b, the rib 95a, and the hood 232, and spot welds between the rib 95b, the rib 95c, and the hood 232, thereby improving the strength of the welded portion. can be made In addition, since the operator also performs spot welding between the rib 95b and the curved portion 302 of the hood 232, the strength can be improved even in the region where the hood 232 is bent. The process of attaching the ribs 96 is also the same as the process of attaching the ribs 95, and the description thereof is omitted.

The hood 232 and the ribs 95 and 96 of the present embodiment have the above-described configurations, so that the ribs 95 can be bent even at the bent portion (for example, the curved portion 302) between the top surface portion 301 and the side surface portion 303. , 96 along which spot welding becomes possible. As a result, the hood 232 and the ribs 95 and 96 of the present embodiment are spot-welded along the curved portion 302, so that they are more resistant to load than when they are connected by I-type butt welding or fillet welding. Welding can be realized. Therefore, the strength of the hood 232 as a whole can be improved. In other words, a damage-resistant hood 232 can be formed.

In the example shown in FIG. 9, the rib 95a is formed with a length L1 in the longitudinal direction, and the rib 95c is formed with a length L3 in the longitudinal direction. The rib 95b is formed with a length L2 in the longitudinal direction so as to partially overlap with each of the ribs 95a and 95c. The partially overlapping portions are then spot welded. In this embodiment, the strength of the ribs 95 and 96 can be improved by spot welding the overlapped portions of the ribs 95 and 96 .

In the ribs 95a, 95b, and 95c according to the present embodiment, the hat-shaped steels are superimposed as described above and then spot-welded, so that the load is applied to the portion connecting the top surface portion 301 and the side surface portion 303. A structure that is difficult to get caught can be realized.

In addition, this embodiment shows an example of the mounting process of the ribs 95a, 95b, and 95c, and is not limited to the mounting process described above. For example, after attaching the rib 95b, the ribs 95a and 95c may be attached. The dimension of rib 95b may be smaller than the dimension of ribs 95a and 95c in order to realize the attachment process.

Furthermore, each of the ribs 95 and 96 is formed by combining three members, but the structure is not limited to combining three members, and may be realized by combining two members. Alternatively, they may be formed as one piece so as not to overlap each other.

The excavator 100 according to this embodiment includes the rear frame 41 for attaching the hood 232 . In this embodiment, the hood 232 is attached to the rear frame 41 .

In the case where the hood 232 is attached to the rear frame 41 of the excavator 100 according to the present embodiment, one end of the hood provided above the engine is attached to a counterweight that constitutes the first vibration system, and the other end is attached to the first vibration system. and the case where it is attached to the house frame that constitutes the vibration system of No. 2. When one end of the hood is attached to the counterweight that constitutes the first vibration system and the other end is attached to the house frame that constitutes the second vibration system, the hood is vibrated from each of the counterweight and the house frame. transmitted.

On the other hand, in the excavator 100 according to the present embodiment, the hood 232 is attached to the rear frame 41, so that one end of the hood is attached to the counterweight that constitutes the first vibration system, and the other end is attached to the second vibration system. Transmission of vibration from the counterweight 2c to the hood 232 can be suppressed as compared with the case where it is attached to the house frame that constitutes the system. Therefore, the excavator 100 according to the present embodiment is compared with the case where one end of the hood is attached to the counterweight that configures the first vibration system and the other end is attached to the house frame that configures the second vibration system. As a result, it is possible to suppress the occurrence of loads due to two vibrations having different properties on the main body of the hood 232 .

Further, the rear frame 41 according to this embodiment is fixed to the plate member 30d by bolting. An operator can see the bolts 44 and 45 by looking into the motor installation space 7 through the opening ZZ on the lower surface of the upper revolving body 2, and can attach/detach the bolts 44 and 45 to/from the plate member 30d. Therefore, in the excavator 100 according to this embodiment, the operator can replace the rear frame 41 without removing the counterweight 2c. Thereby, this embodiment can reduce a worker's work burden.

The ribs 95 and 96 are arranged along the curved portion 302 of the hood 232 and spot-welded to the hood 232 . Therefore, in this embodiment, the rigidity of the ribs 95 and 96 can be exhibited, and the strength of the hood 232 can be improved.

As mentioned above, although the embodiment which concerns on this invention was described, this invention is not limited to the said embodiment. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These also naturally belong to the technical scope of the present invention.

100 Excavator 1 Undercarriage 2 Upper revolving body 3 Cabin 4 Boom 5 Arm 6 Bucket 8 Diesel engine 2a Housing 2b Top cover 232 Hood 2c Counterweight 30 Revolving frame 30a Center right vertical member 30b Center left vertical member 30c Bottom plate 30d Plate member 41 rear frames 41a, 41b support members 41c, 41d support members 42 center frames 43a, 43b front and rear frames 44, 45 bolts 95, 96 ribs

Claims (5)

a lower running body;
an upper revolving body rotatably mounted on the lower traveling body;
a counterweight provided at the rear portion of the upper rotating body;
a prime mover provided on the upper revolving body;
a hood covering the prime mover;
a rear frame that supports the hood,
The rear frame is positioned in front of the counterweight,
Excavator. a first frame provided in front of the rear frame;
front and rear frames connecting between the rear frame and the first frame;
The excavator of claim 1, comprising: forming a support portion below the rear frame that abuts on a revolving frame provided on the upper revolving body;
Shovel according to claim 1 . an engaging portion that engages the rear frame and a revolving frame provided on the upper revolving body;
An opening is formed in the upper rotating body so that the engaging portion can be accessed from below the rotating frame.
Shovel according to claim 1 . the hood is formed of a top surface portion, a side surface portion, and a curved portion between the top surface portion and the side surface portion;
further comprising a rib formed of a hat-shaped steel bent along the curved portion,
Shovel according to any one of claims 1 to 4.

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