JP2007092279A - Back hoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the strength of a swing table in the longitudinal direction and simply and easily mount structures on the swing table. <P>SOLUTION: A support frame of a fork shape in a plan view having right and left vertical ribs and a front end swing bearing member is installed on the swing table. A ground working device is supported to the swing bearing member of the support frame through a swing shaft. A swing cylinder swinging the ground working device is disposed on the swing table at one of the right and left sides, an engine is disposed on the swing table at the other of the right and left sides, and a hydraulic oil tank and a fuel tank are disposed thereon at the rear. One of the right and left vertical ribs is extended from the front to the rear of the swing table, and the other of the right and left vertical ribs is disposed aslant from the front of the one vertical rib to the rear outside. A rear vertical rib is formed from the rear of the other vertical rib toward the rear of the swing table. The rear vertical rib is connected to the rear of the other vertical rib through a connection member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a backhoe including a ground work device at a front portion of a swivel.

  In this type of prior art, for example, in Patent Document 1, a bifurcated support frame having left and right vertical ribs and a front-end swing bearing member is provided on a swivel, and the swing bearing member of the support frame is provided on the swing bearing member of this support frame. The ground working device is supported via the swing shaft, the engine is arranged on the right side of the swivel, the hydraulic pump is arranged at the front of the engine and the hydraulic oil tank is arranged below it, the control valve and fuel at the rear A tank and a counterweight are arranged, and a driver's seat is arranged on the center side of the swivel base from the engine and on the front side of the control valve, the fuel tank and the counterweight.

In Patent Literature 2, a bifurcated support frame in a plan view is extended from the front part to the rear part of the swivel base, the engine is disposed at the rear part, and the hydraulic oil tank and the fuel tank are disposed on the right side of the swivel base.
JP 11-13084 A JP-A-2005-232795

In Patent Document 1, the left and right vertical ribs do not reach the rear part of the swivel base, and have a member that connects the rear ends of both vertical ribs. However, it is difficult to reinforce the rear part of the swivel base, and the role of the support frame is simple. It has become a thing.
Further, in Patent Document 2, the left and right vertical ribs reach the rear part of the swivel and have a member for connecting the rear ends of both vertical ribs, but the left and right vertical ribs do not support a swing cylinder, an engine, or the like. The role of the support frame is simple.
In both the above-mentioned patent documents, since the role of the support frame is simple, an attachment member is separately required to attach the structure on the swivel base, or the support frame and the structure can be mutually reinforced. There are few structures.

An object of the present invention is to provide a backhoe that can solve such problems of the prior art.
It is an object of the present invention to provide a backhoe that improves the strength of the swivel base in the front-rear direction and allows the structure on the swivel base to be easily and easily attached.

Specific means for solving the problems in the present invention are as follows.
First, a bifurcated support frame having a left and right vertical rib and a front-end swing bearing member is provided on the swivel, and the ground work device is supported on the swing bearing member of the support frame via a swing shaft. The swing cylinder that swings the ground work device is arranged on the left and right sides on the swivel base, the engine is arranged on the left and right other sides on the swivel base, and the hydraulic oil tank and the fuel tank are arranged on the rear part.
The left and right vertical ribs are extended from the front to the rear of the swivel, and the other left and right vertical ribs are inclined from the front of the one vertical rib to the rear outside. A rear vertical rib is provided from the portion to the rear part of the swivel, and the rear vertical rib and the rear part of the other vertical rib are connected by a connecting member.

As a result, a frame structure of ribs by left and right vertical ribs and rear vertical ribs is formed from the front to the rear of the swivel, and the strength in the front-rear direction of the swivel can be improved. It can also be used for mounting a structure.
Second, a bifurcated support frame having a left and right vertical rib and a front-end swing bearing member is provided on the swivel base, and the ground work device is supported on the swing bearing member of the support frame via a swing shaft. The swing cylinder that swings the ground work device is disposed on the left side of the swivel base, the engine is disposed on the right side of the swivel base, and the hydraulic oil tank, fuel tank, and counterweight are disposed at the rear.
The right vertical rib extends from the front to the rear of the swivel to support the engine, and the left vertical rib is inclined from the front to the rear of the other vertical rib to support the swing cylinder. The rear vertical rib is provided from the rear portion of the left vertical rib to the rear portion of the swivel, and the rear vertical rib and the rear portion of the right vertical rib are connected by a connecting member.

As a result, a frame structure of ribs by left and right vertical ribs and rear vertical ribs is formed from the front to the rear of the swivel, and the strength in the front-rear direction of the swivel can be improved. Not only the swing cylinder but also the structure such as the engine can be attached.
Third, the engine side vertical rib extends from the front to the rear of the swivel to form a lower partition of the engine room, and the engine room vertical frame is provided upward from the engine side vertical rib. It is that you are.

As a result, the engine-side vertical rib can be used not only for mounting the engine but also for mounting the vertical frame in the engine room.
Fourth, the engine is mounted on the engine-side vertical rib and the mounting base provided on the outer side, and an auxiliary equipment frame that supports the engine auxiliary device is mounted on the engine-side vertical rib across the engine. Is.
As a result, the engine-side vertical rib can be used not only for mounting the engine but also for mounting an auxiliary device frame that supports the engine auxiliary device.

Fifth, a mounting frame that supports the driver's seat is mounted between the rear vertical rib and the rear portion of the engine-side vertical rib across the hydraulic oil tank and the fuel tank.
As a result, the rear vertical rib and the vertical rib on the engine side can also be used for mounting the mounting frame, and mutual reinforcement is also possible.

  According to the present invention, the frame structure of the ribs by the left and right vertical ribs and the rear vertical ribs is formed from the front part to the rear part of the swivel base, and the strength in the front-rear direction of the swivel base can be improved. It can also be used for mounting the structure on the swivel base.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 14, reference numeral 1 denotes a rear small turning type backhoe (turning work machine), which includes a lower traveling device 2, an upper upper structure 3, and a dozer device 4 attached to a front portion of the traveling device 2. The ground work device 5 mounted on the upper structure 3 is provided.
The traveling device 2 has crawler traveling means 7 on the left and right sides of the track frame 6 and can be driven by a hydraulic motor, and is a base of the upper structure 3 on the track frame 6 via a swing bearing 11. The swivel base 10 is supported so as to be turnable around a swivel center (vertical axis) X, and is driven by a swivel motor 8 provided on the swivel base 10. The dozer device 4 is provided with a blade that can be raised and lowered at the front portion of the track frame 6.

In the track frame 6, a swivel joint 12 is disposed at the center of the swivel bearing 11, and the swivel joint 12 projects into the swivel base 10.
The track frame 6 includes a swivel bearing 11 that swivels and supports a swivel base 10 on a top surface of an upper plate and a swivel gear on an inner peripheral side thereof, and an attachment member is attached to a lower surface of the upper plate. The mounting portion of the swivel joint 12 is fixed to the upper plate, and the swivel joint 12 is arranged at the center of the center opening of the upper plate.
2 to 7, the upper structure 3 has an engine 15 on the left and right (right side) and a platform on the left and right other (left side) with respect to the swivel center X on which the swivel joint 12 is located. 16 and a hydraulic oil tank 17 and a fuel tank 18 are arranged at the rear, respectively, and a driver seat 26 on the platform 16 is located at the center side of the swivel base 10 and above the hydraulic oil tank 17 and the fuel tank 18. ing.

The platform 16 includes a case where a two-column type or four-column type lops is provided on the upper side thereof, and a case where the cabin device 27 is configured by mounting the cabin main body 27A.
On the swivel base 10, a bifurcated support frame 21 having left and right vertical ribs 19R and 19L and a swing bearing member 20 at the front end is provided. A swing shaft 22 is attached to the swing bearing member 20 of the support frame 21. The ground working device 5 is supported through the swing cylinder 23, and a swing cylinder 23 that swings the ground working device 5 is disposed on the left side of the turntable 10.
The swing shaft 22 is shifted to the left or right side (right side) with respect to the turning center X, and the center of the driver's seat 26 is shifted to the left or right side (left side) so that the work state by the ground work device 5 can be visually observed. ing.

The engine 15 is arranged on the swivel 10 on the right side of the left and right (right) vertical ribs 19R with the crankshaft 15A facing in the front-rear direction, and a radiator 57 and an oil cooler 58 are arranged in front of the engine 15. A hydraulic pump 59 is disposed on the rear side.
As described in detail in FIGS. 6 to 10, the support frame 21 has the right vertical rib 19 </ b> R substantially along the front-rear direction and is positioned substantially parallel to the engine 15, and the left vertical rib 19 </ b> L has a front portion 19 </ b> La. The swing bearing member 20 is attached to the front surface of the front portion 19La of the right vertical rib 19R.

The front surface of the front portion 19La has substantially the same vertical dimension as the rear surface of the swing bearing member 20, and the left and right dimensions are slightly longer. The left and right protruding portions are welded portions with the swing bearing member 20. It has become. The lower surface of the front portion 19La is welded to the swivel base 10, and the upper surface forms a mounting surface for attaching the platform 16 via the cushion material 76 together with the rear upper portion of the swing bearing member 20.
The left vertical rib 19L supports the swing cylinder 23 by extending the front portion 19La, an inclined portion 19Lb inclined rearward and outward from the front portion 19La, and the rear end of the inclined portion 19Lb in the left and right other directions. The rear portion 19Lc has a tail portion 19Ld bent rearward from the rear portion 19Lc. The rear portion 19Lc is also along the left-right direction and substantially parallel to the front portion 19La.

A connecting portion between the front portion 19La and the right vertical rib 19R is reinforced by a connecting member 86. A coupling member similar to the coupling member 86 may be provided at a bent portion between the front portion 19La and the inclined portion 19Lb.
On the front surface of the rear portion 19Lc, a pair of upper and lower brackets 23a that pivotally support the base portion of the swing cylinder 23 via a pin is provided. The upper bracket 23a is also welded to the inclined portion 19Lb, and reinforces the bent portion between the inclined portion 19Lb and the rear portion 19Lc.

A rear vertical rib 24 is provided from the rear portion 19Lc of the left vertical rib 19L to the rear portion of the swivel base 10, and the rear vertical rib 24 and the rear portion of the right vertical rib 19R are connected by a connecting member 25. The frame 21, including the rear vertical rib 24 and the connecting member 25, has a closed frame shape with a substantially trapezoidal shape in plan view, and is particularly robust against loads applied in the front-rear direction.
Since the left vertical rib 19L is bent in a substantially S shape in plan view, the left vertical rib 19L has a high mounting strength with the swivel base 10 and also serves to increase the strength in the left-right direction of the swivel base 10, and the rear vertical rib 24 and the connecting member The mounting strength of 25 is also increased.

A right vertical rib 19R on the engine 15 side is extended from the front part to the rear part of the swivel base 10 to form a lower partition part of the engine room 14, and a space for arranging the engine room 14, the hydraulic oil tank 17, and the fuel tank 18 The vertical frame 61 of the engine room 14 is provided upward from the right vertical rib 19R.
The right vertical rib 19R is provided with mounting members 19Ra and 19Rb on the front and rear sides. The mounting members 19Ra and 19Rb and the front and rear mounting platforms 63 provided on the right end of the swivel base 10 outside the mounting members 19Ra and 19Rb And an auxiliary equipment frame 65 that supports the engine auxiliary equipment 64 such as an air cleaner is mounted between the two.

The engine 15 is mounted using the right vertical rib 19R and is connected to the right vertical rib 19R to reinforce the right vertical rib 19R. The auxiliary device frame 65 also reinforces the right vertical rib 19R.
2, 7, 13, and 14, the vertical frame 61 includes a square frame 61A, a front partition plate 61B, and a rear partition plate (not shown) disposed between the engine room 14 and the platform 16 (or the cabin device 27). And the cover frame member 66, and are fixed to the auxiliary device frame 65 and the right vertical rib 19R.

The square frame 61A is a rectangular member with a square pipe as a loop and is a strength member. The front partition 61B is provided on the front side of the square frame 61A and covers the left side of the engine room 14. The rear partition plate is provided on the rear side of the square frame 61A and serves as a mounting member for the oil filter 88 as well as partitioning from the tank arrangement space, and these are fixed to the right vertical rib 19R.
The cover frame member 66 covers the upper edges of the square frame 61A and the front partition plate 61B, and has a cover portion 66A that covers the upper surface and the right side surface of the radiator 57.

The front partition 61B may extend to the rear partition and cover the entire surface of the square frame 61A, that is, cover the entire left side surface of the engine room 14.
The auxiliary device frame 65 includes a strip between the square frame 61A and the right end of the swivel base 10, and a strip between the square frame 61A and the right vertical rib 19R. Is located.
When the bonnet 35 covering the engine room 14 is pivotally supported on the vertical frame 61 and / or the auxiliary device frame 65 through a pivotal support portion in the front-rear direction, and the cabin device 27 is mounted. The upper side wall of the cabin device 27 on the engine side overlaps with the upper side of the vertical frame 61.

4, 6, and 7, a mounting frame 30 is mounted across the hydraulic oil tank 17 and the fuel tank 18 between the rear vertical rib 19 and the rear portion (or rear partition plate) of the right vertical rib 19 </ b> R. . The mounting frame 30 reinforces the rear portion of the support frame 21 and is mounted with a control valve 13.
The hydraulic oil tank 17 and the fuel tank 18 are vertically long and longitudinally formed and have a necessary and sufficient volume. Similarly, the hydraulic oil tank 17 and the fuel tank 18 are arranged side by side with an air conditioner 31 that is vertically long and longitudinally formed. Is arranged.

The hydraulic oil tank 17 is formed of sheet metal and is fixed to the upper surface of the swivel base 10, and the fuel tank 18 is formed of synthetic resin and is attached to the hydraulic oil tank 17 by an attachment band 18A. The hydraulic oil tank 17 may be formed of synthetic resin and the fuel tank 18 may be formed of sheet metal. The fuel tank 18 may be fixed to the swivel base 10 independently of the hydraulic oil tank 17.
The fuel tank 18 is arranged at a central position where the influence of the right / left inclination is small so that the fuel can be taken out even when the fuel is low and the swivel base 10 is inclined left / right.

A counterweight 73 is mounted on the rear part of the swivel base 10 and the connecting member 25, and a battery 74 is mounted on the left part of the swivel base 10. The counterweight 73 is formed with an opening 73A that exposes the fuel inlet 18B of the fuel tank 18 at the upper center, and a door 39 that opens and closes the opening 73A.
The platform 16 is disposed from above the swing cylinder 23 and the battery 74 of the swivel base 10 to above the hydraulic oil tank 17, the fuel tank 18 and the counterweight 73, and the front part is a support leg 75 at the front part of the swivel base 10. And the rear part is detachably mounted on the counterweight 73 (or mounting frame 30) via the cushion material 76 on the swing bearing member 20.

  4, 5, 12, and 13, the platform 16 is integrally formed of sheet metal or synthetic resin, and a step portion 16 </ b> A that forms a step surface above the swing cylinder 23 and the battery 74, A rising portion 16B that rises from the rear end of the step portion 16A and is positioned in front of the hydraulic oil tank 17 and the fuel tank 18, and extends from the upper end of the rising portion 16B to above the hydraulic oil tank 17 and the fuel tank 18. A mounting portion 16C forming a driver seat mounting surface, a rear connecting portion 16D extending rearward and upward from the rear end of the mounting portion 16C to the counterweight 73, a step portion 16A, a rising portion 16B, Side wall portion 16E rising from the engine side edge of mounting portion 16C and rear connecting portion 16D To have.

  A driver seat mounting base 42 is provided on the mounting portion 16C of the platform 16 via a suspension device 41. The driver seat mounting base 42 is provided with a driver seat 26 and an operating device 29. When receiving a large shake, the operation device 29 is shaken integrally with the driver's seat 26. The attachment portion 16 </ b> C is arranged lower than the top of the engine 15, at least the upper portion of the engine room 14. Since the mounting portion 16C can be lowered, the suspension device 41 can be used even when the driver's seat 26 is at the same height as the prior art.

Accordingly, the driver's seat 26 is disposed at an appropriate height and front and rear position without being obstructed by the engine that is the bulkier on the swivel base 10, the hydraulic oil tank 17, and the fuel tank 18. Further, as described above, the hydraulic oil tank 17, the fuel tank 18, and the air conditioner 31 below the driver's seat 26 are compactly accommodated on the swivel base 10 by utilizing the same shape.
The platform 16 is also provided with a traveling control device 28 and can constitute a bottom plate of the cabin device 27. The cabin device 27 surrounds the driver seat 26, the control device 28 and the operation device 29, and a cabin body 27A. Is configured on the platform 16.

1-3, 11-14, the cabin body 27A has a front portion 27a having a windshield, a back portion 27b having a rear glass, a side wall upper portion 27c having a side glass on the engine side and a ceiling portion 27d, and a door 67 on the left side. The lower right side of the cabin body 27A is formed by the side wall portion 16E of the platform 16. The side wall portion 16E can also serve as the side wall of the engine room 14.
The side wall upper portion 27c extends to the upper side of the vertical frame 61, and an elastic seal member 69 is provided between the two. Even if the cabin device 27 vibrates up and down with respect to the swivel base 10, rainwater is generated in the cabin. Intrusion into the device 27 is prevented.

The control device 28 on the platform 16 switches between the pedal / lever interlocking traveling operation means 43 in front of the driver's seat 26, the swing cylinder operation means 44 operated with the right foot, and the high and low speeds of the traveling device 2. A foot change switch 45 operated by one of the left and right feet and a hand change switch 46 operated by a hand on the same side as the foot change switch 45 are provided.
The foot changeover switch 45 and the hand changeover switch 46 for switching between the high and low speeds of the traveling device 2 are arranged at positions that can be operated by the right foot and right hand of the driver sitting on the driver seat 26.

In addition, a foot pedal 77 is provided at the left front portion of the platform 16 to supply hydraulic oil to hydraulic equipment attached to the ground work device 5 by left foot operation.
The operation device 29 has two grip-type work operation means 43R and 43L arranged on the left and right sides of the driver's seat 26 in order to share a plurality of operations of the ground work device 5 with two grips 32. The left grip type work operation means 43L is configured such that the driver can turn and retreat upward when getting on and off.
The grips 32R and 32L of the two grip-type work operation means 43R and 43L are pilots that pilot-operate the hydraulic equipment constituting the ground work device 5 such as the turning motor 8, the boom cylinder 52, the arm cylinder 54, and the work tool cylinder 56. Valves are allocated and arranged, and if there are other hydraulic equipment that constitutes the ground work device 5, the hydraulic equipment and / or hydraulic equipment to be attached to the ground work device 5 such as a breaker are included in the hydraulic equipment. Switches for supplying hydraulic oil are also distributed.

For example, the right (one) grip 32R is provided with a volume switch 80 and a phone switch 83 for supplying hydraulic oil to a hydraulic device attached to the ground work device 5, and the left (other) grip 32 has An operation switch 81 and a changeover switch 82 for selectively operating two types of hydraulic equipment are provided.
A two-piece switch that supplies hydraulic oil to a bending / extending cylinder that causes the second boom to bend and extend with respect to the first boom when the operation switch 81 and the ground working device 5 in which the boom 51 can be bent and extended with two members are used. Or when the hydraulic equipment attached to the ground work device 5 has two hydraulic drive units, the second external unit switch that supplies hydraulic oil to the second hydraulic drive unit can be used. When both hydraulic devices are used, only one operation switch 81 may be provided, and the alternate use of both hydraulic devices may be switched by the changeover switch 82. The changeover switch 82 may be switched on and off of the operation switch 81.

Reference numeral 85 denotes a monitor for displaying a traveling / working state arranged at the upper right of the platform 16 and is attached to the side wall portion 16E (or a column is erected from the step portion 16A).
2, 3, 5, 11, the upper structure 3 includes a bonnet 35 that covers the upper surface and the outer surface of the engine room 14, a front cover 36 that covers the front surface of the engine room 14 on the front side of the cover portion 66 </ b> A, and the swivel base 10. And a lower side cover 37 that covers the space for arranging the swing cylinder 23 and the battery 74 is provided between the front portion of the platform 16 and the front portion of the platform 16 so as to be freely opened and closed. The outer peripheral edge of the swivel base 10 protrudes outward from the bonnet 35, the front cover 36, and the lower side cover 37, so as to minimize contact with obstacles.

An axial center of the pivot supporting the upper end of the bonnet 35 is arranged in the front-rear direction, and an axial center of the pivot supporting the lower end of the front cover 36 is arranged in the horizontal direction (or in the vertical direction). The shaft center of the pivot portion that pivotally supports the front end portion of the lower side cover 37 is arranged in the vertical direction.
A control valve 13 is disposed on the outer side of the hydraulic oil tank 17 between the swivel base 10 and the rear part of the platform 16, and a rear lateral cover 38 covering the control valve 13 is provided to be openable and closable. The axial center of the pivot part that pivots the part is arranged in the vertical direction. The lateral cover 38 may be opened and closed around the horizontal axis by providing a pivotal support at the lower front part.

While the control valve 13 is mounted on the rear side of the swivel base 10 and in the vicinity of the hydraulic oil tank 17 via the mounting frame 30, a relay junction is provided at a position of the platform 16 disposed in the vicinity thereof. 70 is attached.
Connected to the relay junction 70 are hoses that communicate with the control device 28 and the operation device 29 on the platform 16. These hoses are assembled and attached to the swivel base 10, and the relay junction 70, the control valve 13, Are connected by a hose, and the piping of the swivel base 10 and the piping of the platform 16 can be assembled and easily connected.

  In FIG. 1, the ground work device 5 includes a swing bracket 50 pivotally supported on a swing bearing member 20 of a support frame 21 via a swing shaft 22, and a boom bracket connected to the swing bracket 50. A boom 51 that can be raised and lowered via a cylinder 52, an arm 53 that is connected to the boom 51 and that can rotate about an abscissa via an arm cylinder 54, and a work tool cylinder 56 that is connected to the arm 53. A work piece (bucket) 55 that can be scooped through, and the boom 51 may be a two-piece boom that allows two members to bend and extend. One or two hydraulic devices having one or two hydraulic drive units may be attached.

In the present invention, the shape of each member and the positional relationship of front / rear / left / right / up / down are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, a radiator 57 is disposed behind the engine 15 and a hydraulic pump 59 is disposed in front, the left and right positions of the engine 15, the platform 16 and the cabin device 27 on the swivel base 10, and the left and right shapes of the support frame 21 are opposite to each other. Or you may.

  Instead of the cabin main body 27A, a two-post type driver's seat protective frame is erected upward from the rear part of the platform 16 behind the driver's seat 26, and the rear column of the rear part of the platform 16 and the front part of the swivel base 10 are arranged. A four-poster type driver's seat protection frame having a front column and a awning roof may be erected.

1 is an overall side view showing an embodiment of the present invention. It is a whole perspective view from the right front. It is a whole perspective view from the left rear. It is a side view of an upper structure. It is a front view of an upper structure. It is a top view inside an upper structure. It is a perspective view inside an upper structure. It is a top view of a turntable. It is a perspective view of a turntable. It is a side view of a turntable. It is a schematic plan view of an upper structure. It is a top view of a platform. It is a partial cross section front view of an upper structure. It is an expanded sectional view between an engine room and a cabin device.

Explanation of symbols

1 Backhoe (Swivel work machine)
DESCRIPTION OF SYMBOLS 2 Traveling apparatus 3 Superstructure 4 Ground working machine 10 Turning platform 14 Engine room 15 Engine 16 Platform 17 Hydraulic oil tank 18 Fuel tank 19R Right vertical rib 19L Left vertical rib 20 Swing bearing member 21 Support frame 22 Swing shaft 24 Rear vertical rib 25 Connecting member 26 Driver's seat 27 Cabin device 28 Steering device 29 Operating device 30 Mounting frame 65 Auxiliary device frame

Claims (5)

A bifurcated support frame having a right and left vertical rib and a swing bearing member at the front end is provided on the swivel base, and the ground work device is supported on the swing bearing member of the support frame via a swing shaft. A swing cylinder that swings the ground work device is arranged on one side of the left side, an engine is arranged on the left and right side on the swivel, and a hydraulic oil tank and a fuel tank are arranged on the rear side.
The left and right vertical ribs are extended from the front to the rear of the swivel, and the other left and right vertical ribs are inclined from the front of the one vertical rib to the rear outside. A backhoe characterized in that a rear vertical rib is provided from a part to the rear part of the swivel, and the rear vertical rib and the rear part of the other vertical rib are connected by a connecting member. A bifurcated support frame having a right and left vertical rib and a swing bearing member at the front end is provided on the swivel base, and the ground work device is supported on the swing bearing member of the support frame via a swing shaft. A swing cylinder that swings the ground work device is arranged on the left side of the engine, an engine is arranged on the right side of the swivel, and a hydraulic oil tank, a fuel tank, and a counterweight are arranged at the rear.
The right vertical rib is extended from the front to the rear of the swivel to support the engine, and the left vertical rib is inclined from the front of the right vertical rib to the rear outer side to form a swing cylinder. And a rear vertical rib is provided from the rear part of the left vertical rib to the rear part of the swivel, and the rear vertical rib and the rear part of the right vertical rib are connected by a connecting member. .   The engine-side vertical rib extends from the front to the rear of the swivel to form a lower partition of the engine room, and the engine-room vertical frame is provided upward from the engine-side vertical rib. The backhoe according to claim 1 or 2.   The engine is mounted on the engine-side vertical rib and a mounting base provided outside the engine, and an auxiliary equipment frame that supports the engine auxiliary device is mounted on the engine-side vertical rib across the engine. The backhoe according to any one of claims 1 to 3.   The mounting frame for supporting the driver's seat is mounted across the hydraulic oil tank and the fuel tank between the rear vertical rib and the rear portion of the engine-side vertical rib. The backhoe described in Crab.

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