JPH09310375A - Bonnet support structure in construction working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the opened state of a bonnet on a slewing machine body without installing a member such as a support bar. SOLUTION: A bonnet 11 covering an engine, etc., is mounted on a slewing machine body 3, one side of the bonnet 11 is supported on the machine body 3 side in a freely open-close manner through a hinge device 42, and the hinge device 42 has a hinge member 45 fixed on the bonnet 11 side and rotatably supported on the machine body 3 side. A support surface 50 holding the opened state of the bonnet 11 by abutting with the hinge member 45 when the bonnet 11 is opened is formed to the machine body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a bonnet support portion in a construction work machine such as a backhoe.

[0002]

2. Description of the Related Art In a conventional backhoe, a weight for balancing with a working device provided at a front portion of the turning machine body is provided at a rear portion of the turning machine body, and a bonnet for covering an engine and the like is provided on the turning machine body. There is one in which the rear side of the bonnet is openably and closably supported to the rear of the weight through a hinge device (see, for example, Japanese Utility Model Laid-Open No. 6-29545), and the bonnet covers the entire engine and the like. Further, it is configured to open the entire engine and the like by opening.

In this type of backhoe, when the bonnet is normally opened, the bonnet is supported by a support rod, a wire, an air cylinder or the like to hold the opened state, and when the bonnet is closed, The lower edge of the bonnet is supported by the upper surface of the swing body and the upper surface of the weight.

[0004]

By the way, in recent years, in order to easily perform work in a narrow space, the backhoe is designed to be as small as possible by making the turning diameter of the turning machine body as small as possible. The size of the swivel body is reduced, and the engine room for accommodating the engine, the radiator and the like formed by being covered with the hood is also reduced as much as possible.

However, if a support rod or the like is used to support the open / closed state of the bonnet as in the above-mentioned conventional one, it is necessary to secure a space for accommodating these in the bonnet, which leads to the above miniaturization. It will be contrary. When the bonnet is closed, the bonnet is supported by the flat upper surface and the weight upper surface of the revolving machine body.
There is a risk of rattling of the bonnet while driving or running. In addition, the bonnet may be misaligned and a gap may be created between the slewing machine body and the weight.In such a case, engine noise may leak from the gap and cause noise, or radiator air may escape from the gap. This causes a problem of impairing cooling efficiency.

Therefore, in view of the above problems, the present invention makes it possible to save the space in the bonnet without providing a member such as a support rod when the bonnet is opened, and to stably hold the bonnet. Another object of the present invention is to provide a support structure for a bonnet in a swivel work machine which can stably hold the bonnet without a gap even when the bonnet is closed.

[0007]

The present invention employs the following technical means to achieve the above object. That is,
A bonnet 11 that covers equipment such as an engine 16 is provided on the machine body 3 of the work machine 1, and one side of the bonnet 11 is provided on the machine body 3
In the bonnet support structure of a construction work machine which is openably and closably supported on the side by a hinge device 42, one end of the hinge device 42 is rotatably supported on the machine body 3 side and the other end is fixed on the bonnet 11 side. Hinge member 4
5 and is characterized in that the airframe 3 is formed with a bearing surface 50 that holds the open state of the bonnet 11 by contacting the hinge member 45 when the bonnet 11 is opened.

According to this, it is not necessary to provide a member such as a support rod in order to hold the open state of the bonnet 11 by the bearing surface 50 of the machine body 3, and thus the bonnet 11
It is also possible to downsize the fuselage without securing extra space. In addition, the present invention is based on
An opening 10 for accommodating a device such as
In the hinge member 45, one end of the hinge member 45 is supported below the upper end of the peripheral wall 9D, and a recess 49 is formed in the hinge member 45 to avoid the upper end of the peripheral wall 9D when the hinge member 45 is rotated. A bearing surface 50 that forms a bearing surface 50 and abuts the bearing surface 50 on one side of the recess 49.
9a is formed. According to this, the supporting structure of the bonnet 11 can be simplified and the opening angle of the bonnet 11 can be increased by the recess 49 of the hinge member 45.

According to the present invention, in the rear part of the body 3,
A weight 9 for balancing with the working device 4 provided at the front of the machine body 3 is provided. One end of the hinge member 45 is supported by the weight 9 and the bearing surface 50 is attached to the weight 9.
It is possible to more stably hold the bonnet open by using the weight 9.

Further, according to the present invention, a horizontal and flat step portion 8A is provided on the upper surface of the machine body 3, an inclined portion 9A extending rearward and obliquely upward from the step portion 8A, and a rear end of the body 3 from the inclined portion 9A. And a receiving portion 50 which is substantially parallel to the step portion 8A is formed, and the lower edge of the bonnet 11 is formed so as to be mountable in a shape suitable for the step portion 8A, the inclined portion 9A, and the receiving portion 9B. According to this feature, even when the bonnet 11 is closed, the step portion 8A, the inclined portion 9A, the receiving portion 9B of the machine body 3 and the lower edge of the bonnet 11 conforming to the step portion 8A are surely positioned, and the bonnet 11 is stably provided. The closed state is maintained, and there is almost no gap between the hood 11 and the machine body 3.

Further, the present invention is characterized in that an elastic seal material 52 is provided on the lower edge of the bonnet 11, thereby making it possible to prevent the gap between the bonnet 11 and the machine body 3 more reliably. The impact when the bonnet 11 is closed will be relaxed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a small backhoe 1 as a construction work machine, and this small backhoe 1 is mainly composed of a traveling device 2, a turning machine body 3, and a working device (excavation device) 4.

The running direction of the backhoe 1 shown by the arrow B in FIG. 4 will be referred to as the front-rear direction, and the lateral direction indicated by the arrow C orthogonal to the front-rear direction will be referred to as the left-right direction. Traveling device 2
As shown in FIGS. 3 to 5, a crawler type traveling device is employed which includes a pair of left and right crawler traveling bodies 5 each having a rubber crawler track, and these traveling bodies 5 are driven by a hydraulic motor M1. . The traveling device 2 is configured to connect and support the crawler traveling bodies 5 so as to be movable in the left-right direction, and to move the crawler traveling bodies 5 in the left-right direction by a hydraulic cylinder so that the interval between the left and right crawler traveling bodies 5 can be adjusted. . A dozer 6 is provided at the front of the traveling device 2.

As shown in FIGS. 3 to 5 and 7, the excavating device 4 is fixed to the right front part inside the turning machine body 3 and is vertically projected from an opening 30 formed in the front surface of the turning machine body 3. A swing bracket 32 pivotally attached to the pair of support brackets 29 via a support shaft 31 so as to be pivotable left and right around the vertical axis, and a base portion is pivotally attached to the pivot bracket 32 so as to be pivotable about the left and right axes. A boom 34, and an arm 35 pivotally attached to the tip end side of the boom 34 so as to be swingable around the left and right axes,
A bucket 36 is attached to the tip of the arm 35 so as to be freely squeezed and dumped.

On the right side of the swing bracket 32, a piston rod 33a of a swing cylinder 33, which is arranged in the swivel body 3 below the radiator 17, is rotatably pivoted about a vertical axis. When the piston rod 33a of the cylinder 33 moves back and forth, the swing bracket 32
Is swung right and left around the support shaft 31. The boom 34
Is rocked by a boom cylinder 37 provided between the rocking bracket 32 and a midway portion of the boom 34,
The arm 35 is oscillated by an arm cylinder 38 provided between the midway portion of the boom 32 and the base portion of the arm 35, and the bucket 36 is provided between the base portion of the arm 35 and the attachment portion of the bucket 36. Bucket cylinder 39
It is designed to be operated by squeeze dump.

The turning machine body 3 has a main body 8 rotatably supported about a vertical turning axis A on a bearing body 7 provided in the central portion between the left and right crawler running bodies 5 of the running device 2. A counterweight 9 is provided at the rear of the main body 8 to balance the weight of the excavator 4 and the like attached to the front of the main body 8. The rear side of this swivel body 3 is
As shown in FIGS. 4 and 7, the circular locus circle formed by the rear surface of the fuselage is formed in an arc shape in a plan view with the substantial pivot axis A as the center, and the circular locus of the left and right crawler traveling bodies 5
When the lateral width of the traveling device 2 is maximized, the swivel body 3 is accommodated within the lateral width of the traveling device 2 from the lateral width of the traveling device 2.
Does not project outward. The circle of the turning trajectory of the turning machine body 3 is contained within the front-rear length of the crawler traveling body 5. That is, the back hoe 1 is configured as a so-called small backward turning type, and the driver does not need to use nerves backward when performing work accompanied by turning, and can concentrate on the work.

The lateral width of the turning machine body 3 is narrower than the diameter of the circle of the turning trajectory drawn by the rear surface of the machine body, and the left and right side surfaces are formed in straight lines parallel to each other in a plan view. When the left and right width of the traveling body 5 is minimized, the left and right outer edges of the crawler traveling body 5 are positioned so as to substantially coincide with the left and right side surfaces of the turning machine body 3.

As shown in FIGS. 6 and 7, between the main body 8 and the weight 9 at the rear of the upper surface of the swivel body 3, there is an upward opening, and the opening 10 is closed by a bonnet 11. Further, the inside of the main body 8 is hollow so that devices can be housed therein. On the left side of the front part of the swivel body 3,
A steering box 12 equipped with levers and pedals for operating hydraulic equipment provided on the traveling device 2, the turning machine body 3, the excavation device 4, etc. is provided, and each hydraulic equipment is provided below the steering box 12 inside the turning machine body 3. A control valve 13 for controlling the is arranged. Further, a driver's seat 14 is provided on the hood 11 behind the control box 12, and a place where the driver's seat 14 on the upper surface of the bonnet 11 is provided is a recessed portion 15 recessed from the upper side for stability. ing. Further, the control box 12 and the bonnet 11 are arranged at a front and rear with a space therebetween, and a space between the control box 12 and the bonnet 11 is a passage space, and the upper surface of the main body portion 8 corresponding to the passage space is Horizontally flat step part 8A
It has been. In the control box 12, the driver's seat 1
A handrail 54 that can be used when getting on and off the vehicle 4 is attached, and columns of a shade 55 are detachably attached to the left and right side surfaces of the weight 9.

The handrail 54 is formed in a substantially gate shape in the front view shown in FIG. 5, and the left side of the handrail 54 protrudes leftward from the operation box 12 and is fixed to the upper and lower midway portions of the operation box 12. The right side of the handrail 54 extends downward in front of the operation box 12 and is fixed to the lower side of the operation box 12. Further, the right side of the handrail 54 is arranged to the left of the boom 34 of the excavator 4. Therefore, the boom 34 does not interfere with the handrail 54 even when the boom 34 is swung up and down (back and forth), and the handrail 54 is prevented from being damaged.

As shown in FIGS. 6 and 7, an engine 16, a radiator 17, a hydraulic pump 18 driven by the engine 16, a fuel tank 19 for the engine 16, and respective hydraulic pressures are provided in the opening 10 of the swivel body 3. Equipment such as hydraulic oil tank 20 for equipment is stored, and these equipment are bonnet 1
It is covered by 1. The engine 1
6 is laterally arranged in the center of the turning machine body 3 in the left-right direction, and the crankshaft center D of the engine 16 is substantially aligned with the left-right direction of the turning machine body 3. A radiator 17 is arranged on the right side of the engine 16, and a hydraulic pump 18 is arranged and fixed on the left side of the engine 16. The hydraulic pump 18 is driven by an output shaft of the engine 16. . A muffler 21 is provided above the hydraulic pump 18.
Is arranged in the front-rear direction, a fuel tank 19 formed in the front-rear direction is arranged below the hydraulic pump 18, and a hydraulic oil tank 20 is arranged on the lower rear side of the engine 16.

The hydraulic oil tank 20 is integrally formed by recessing the weight 9 from above, and is formed horizontally long in the left-right direction.
A lid 20a that closes the upper end opening is bolted, and an auxiliary tank 22 is provided on the left side of the lid 20a. A battery 23 is arranged and fixed on the left side of the auxiliary tank 22 and substantially in the center of the weight 9 on the left and right sides.

In this way, the excavator 4 is installed in the swing body 3 in this way.
While the fuel tank 19 is arranged on the left side of the rear part of the turning machine body 3 and the hydraulic oil tank 20 is arranged on the rear part of the turning machine body 3 in the left-right direction, Good weight balance between front and rear. The air cleaner 2 is provided at the upper right rear of the engine 16.
4 are arranged in the left-right direction, and the intake hose 25 of the air cleaner 24 is extended from the air cleaner 24 to the front side of the engine 16 while bypassing the left side of the upper part of the engine 16 and to the front side of the upper part of the engine 16 to the right. The radiator 17 extends toward the front side of the radiator 17 and extends downward to the lower side of the radiator 17.

As shown in FIGS. 4 and 7, the radiator 17 is formed on the right side surface of the bonnet 11.
A fan 26, which is arranged to face an exhaust port 27 composed of a large number of holes and which is rotatably driven by the engine 16, is mounted on the right side of the engine 16, and a cooling wind generated by the fan 26 is provided. Is blown to the right, that is, toward the radiator 17, and is discharged from the air outlet 27 through the core of the radiator 17.

Further, the lower surface of the revolving machine body 3 on the lower side of the radiator 17 is formed as an opening and serves as an inlet for cooling air, and the intake to the air cleaner 24 is also performed from this inlet. In the side view shown in FIGS. 3 and 6,
The main body portion 8 and the weight 9 of the swivel body 3 are formed such that at the boundary portion (the step portion 8A and the upper surface of the front end of the weight 9), the both are substantially at the same height and the upper surfaces are substantially flush with each other.
The upper and right side wall upper surfaces of the weight 9 are formed in an inclined portion 9A which inclines rearward and obliquely upward from this boundary portion, and the upper rear surface of the weight extending from the inclined portion 9A to the rear is the main body portion 8
The step portion 8A on the upper surface is also a receiving portion 9B which is formed substantially in parallel at a high position.

The lower edge of the bonnet 11 can be placed in a shape suitable for the step portion 8A, the inclined portion 9A of the weight 9 and the receiving portion B. The bonnet 11 is made of a sheet metal press, a resin or the like, and its lower rear portion is pivotally attached to the weight 9 via a hinge device 42 so as to be rotatable about a spindle pin 43 in the left-right direction so that it can be opened and closed. When the bonnet 11 is closed,
When the engine 16 and the engine auxiliary equipment (radiator, battery, etc.) are entirely covered and opened, as shown by the phantom line in FIG. It is formed in such a size that the entire surface can be opened so that the inside of the bonnet 11 can be inspected.

As shown in FIGS. 1, 2 and 6 and 7, the hinge device 42 includes a lid 2 for the hydraulic oil tank 20.
Support bracket 44 fixed on 0a, a pair of left and right hinge members 45 fixed to the lower rear inner side surface of the bonnet 11, and a spindle pin 43 for rotatably connecting the hinge member 45 and the support bracket 44. It consists of The support bracket 44 is formed in a substantially U shape facing upward in the rear view shown in FIG. 2, and a lower wall 44b thereof is attached to the weight 9 by a bolt 20b for fixing the lid 20a to the weight 9. It is fixed together.
Further, an intermediate standing wall 44M is provided upright in the middle of the support bracket 44 between the left and right standing walls 44L and 44R.

Left and right standing walls 44 of the support bracket 44
Each of the L and 44R and the intermediate standing wall 44M is formed with a hole 44a penetrating in the left-right direction, and the right support shaft pin 43R shortly formed in the hole 44a formed in one of the left and right (right in the figure) standing wall 44R. The vertical wall 44R
The right outer shaft pin 43R is fixed by welding or the like so that the outer shaft end portion of the right support shaft pin 43R projects to the right outer side of the right outer surface. The left support shaft pin 43L formed longer than the right support shaft pin 43R is axially slidably left in the hole 44a formed in the left and right standing walls 44L and the middle standing wall 44M.
It is inserted so as to bridge the intermediate standing walls 44L and 44M.

A collar piece 43a is provided in the middle of the left support shaft pin 43L in the longitudinal direction, and an urging means 48 formed of a compression coil spring is provided between the collar piece 43a and the intermediate standing wall 44M. The left shaft pin 43L is urged in the direction in which the outer end of the shaft 43L projects from the left outer side of the left standing wall 44L. Further, the left support shaft pin 43L is formed with a restricting piece 43b that restricts the amount of protrusion from the left standing wall 44L.
The amount of protrusion of the right support shaft pin 43R from the right upright wall 44R and the left upright wall 44 of the left support shaft pin 43L by the restriction piece 43b.
Positioning is performed so that the protrusion amounts from L are substantially the same. Then, when the left support shaft pin 43L is moved rightward in the axial direction against the biasing means 48, the outer end portion of the pin 43L retracts inward from the outer surface of the left standing wall 44L. Is configured to.

In the side view of FIG. 1, the pair of left and right hinge members 45 are formed in a substantially U shape having a concave portion 49 whose rear side is open when the bonnet 11 is closed, and one end portion thereof is formed. It is fixed to the bonnet 11 by welding or the like, and the left and right support shaft pins 43L and 43R are provided at the other end.
Is formed with a connection hole 45a. And
As shown in FIG. 2, the lateral sides of the left and right hinge members 45 are arranged to be substantially the same as the lateral width of the support bracket 44.

With the above structure, when the bonnet 11 is attached to the swivel body 3 (weight 9), that is, when the hinge members 45 are connected to the left and right support shaft pins 43L and 43R provided on the support bracket 44, Left spindle pin 4
3L is moved inward to the left and right (rightward) against the biasing means 48 and retracted inward from the outer surface of the left standing wall 44L, and the right support shaft pin 43R is moved to the corresponding right hinge. Member 4
It is inserted into the connection hole 45a of 5R. And the left standing wall 44L
The hole 44a formed on the left side of the hinge member 45L and the connecting hole 45a formed on the left side hinge member 45L are aligned with each other to release the left support shaft pin 43L (the biasing means 48 automatically causes the left standing wall 44 to rise).
By projecting it from the outer side surface of L), the left support shaft pin 43L is inserted into the connection hole 45a of the left hinge member 45L, and the connection is completed. When the connection between the support bracket 44 and the hinge member 45 is released, the reverse operation is performed.

That is, the bonnet 11 can be easily attached by simply retracting the left support shaft pin 43L in the axial direction.
It can be removed, and the biasing means 48 can surely maintain the state in which the pin 43L is inserted into the connecting hole 45a of the left hinge member 45L. Further, not only the number of parts is small, but all the constituent members of the hinge device 42 are provided for the weight 9 or the bonnet 11, so that the parts are prevented from being lost.

It is preferable to provide a manual lever or the like on the left support shaft pin 43L in order to facilitate the operation of moving the left support shaft pin 43L back and forth. Further, the spindle pin 43 in the hinge device 42 is arranged on the hydraulic oil tank 20 of the weight 9, that is, in the vicinity of the inside of the peripheral wall 9D of the opening 10 in the weight 9 and below the upper end of the peripheral wall 9D, Since the hinge member 45 is formed in a substantially U shape in a side view and has the recess 49 as described above, the hinge member 4 is
The concave portion 49 of 5 avoids the upper end portion of the peripheral wall 9D when the hinge member 45 is rotated with the spindle pin 43 as a fulcrum. Further, a tapered surface 9C is formed on the outside of the upper end of the peripheral wall 9D of the weight 9 in order to avoid interference with the lower edge of the bonnet 11.

When the bonnet 11 is fully opened, the inner surface (bearing surface) 50 of the rear wall of the weight 9 and one side surface (bearing surface) 49a of the recess 49 of the hinge member 45 come into contact with each other. With the bonnet 11 fully open, the bearing surface 5
It is configured to be held by 0. Therefore, it is necessary to maintain the open state of the bonnet 11 as in the related art, for example, to provide a support rod, a wire, an air cylinder, or the like between the bonnet 11 and the swivel body 3, and also to secure a space for installing these. There is no need, and space in the bonnet 11 can be saved. Further, since the hinge member 45 is supported by the weight 9 and the open state of the bonnet 11 is held by using the weight 9, it is possible to maintain the stable open state.

Further, by forming the recess 49 in the hinge member 45, the opening angle of the bonnet 11 can be increased. When the bonnet 11 is closed, the step portion 8A of the main body portion 8 and the inclined portion 9A of the weight 9, the receiving portion 9B, and the lower edge of the bonnet 11 that fits the step portion 8A are positioned and stable without rattling. The closed state can be maintained, and there is almost no gap between the bonnet 11 and the turning machine body 3.

As shown in FIG. 7, the hinge member 45 is formed in a vertically oriented flat plate shape, the battery 23 on the lid 20a is arranged between the left and right hinge members 45, and the left hinge member 45 is Since it is arranged in the gap between the battery 23 and the auxiliary tank 22, the hinge member 45 makes effective use of the space without damaging the space in the hood 11.
Further, since the hinge device 42 is housed in the bonnet 11 and the weight 9 and is not exposed to the outside, it is possible to reduce the gap between the main body 8 and the weight 9 when the bonnet 11 is closed. Has become.

The bearing surface 50 of the weight 9 is provided with an elastic plate 51 made of rubber or the like for cushioning the shock of the contact with the supported surface 49a of the hinge member 45, and the entire lower edge of the bonnet 11 is surrounded. Is an elastic seal material 5 such as rubber
2 is provided to prevent water from entering and leaking noise when the bonnet 11 is closed, as well as to prevent a shock when the bonnet 11 is closed and to prevent peeling of the paint.

In the above structure, the left and right support shaft pins 43
Although one (left) of L and 43R is supported by the support bracket 44 so that it can be inserted into and removed from the hinge member 45, both support shaft pins may be inserted into and removed from it. It is also possible to provide the support shaft pin 43 on the hinge member 45 side. And
Instead of providing the urging means 48 for the support shaft pin 43, a stopper or the like for positioning the support shaft pin 43 in the protruding state and the retracted state may be separately provided.

The side of the bonnet 11 is attached to the turning body 3
It is also possible to attach it to the left, right, or front of the via the hinge device 42. FIG. 8 shows an example of a connecting portion between the body portion 8 and the weight 9 in the swivel body 3. A board 8B that forms the skeleton of the swivel body 3 is provided at the bottom of the main body portion 8, and a connecting bracket 57 for attaching the weight 9 is provided at the rear portion of the board 8B. The connecting bracket 57 has a vertical wall 58 facing upward and standing upward, and a bottom wall 59 facing upward and extending rearward. The bottom wall 59 has a plurality of upward protruding walls. A trapezoidal convex portion 60 is formed, and an insertion hole 61 through which the connecting bolt 63 is inserted is formed in the vertical wall 58.

On the other hand, on the bottom surface of the weight 9, the projection 60
A concave portion 62 having a shape adapted to the above is formed, and a female screw 64 corresponding to the insertion hole 61 is formed on the front surface of the weight 9. Therefore, in order to connect the weight 9 to the main body portion 8, the weight 9 is attached to the convex portion 60 on the main body portion 8 side.
The side concave portion 62 is fitted and positioned, and the bolt 63 is screwed into the female screw 64 of the weight 9 through the insertion hole 61.

By the way, the backhoe 1 shown in the above embodiment is a so-called small rear swing type, and the rear end portion of the swinging machine body 3 is made small so that the swinging radius is set within the width of the crawler traveling device 2 in the front-rear direction. However, it is formed so that the work can be easily performed, but by reducing the size of the turning machine body 3 in this way, the weight balance between the weight 9 at the rear of the machine body and the excavation device 4 provided in front of the machine body 3 is impaired. There is a fear. In order to avoid this, it is necessary to increase the weight of the weight 9, but if the weight of the weight 9 is increased, it becomes difficult to attach the weight 9 to the main body portion 8 of the turning machine body 3.

Therefore, by making it possible to easily position and connect the weight 9 to the main body portion 8 by fitting the concave and convex portions as described above, it is possible to reduce the weight of the weight 9 as the turning machine body is downsized. It is possible to respond appropriately. By forming the convex portion 60 formed on the main body portion 8 into a trapezoidal shape (tapered shape), alignment between the main body portion 8 and the weight 9 is further facilitated.

The present invention is not limited to the above-mentioned embodiment, and the design can be changed appropriately.

[0043]

As described in detail above, according to the present invention, a bonnet for covering equipment such as an engine is provided on the machine body of a working machine, and one side of the bonnet can be freely opened and closed on the machine body side via a hinge device. In the bonnet support structure for a supported construction work machine, the hinge device has a hinge member whose one end is rotatably supported on the machine body side and the other end is fixed to the bonnet side, and the machine body, Since the bearing surface for holding the open state of the bonnet is formed by contacting with the hinge member when the bonnet is opened, it is not necessary to provide a member such as a support rod to hold the opened state of the bonnet, and thus the bonnet is not necessary. It is possible to downsize the aircraft without securing extra space.

Further, according to the present invention, an opening for accommodating equipment such as an engine is formed in the machine body, one end of the hinge member is supported below the upper end of the peripheral wall in the opening, and the hinge member is rotated. When the hinge member is formed with a recess that avoids the upper end of the peripheral wall, the bearing surface is formed on the peripheral wall, and a bearing surface is formed on one side of the recess to abut the bearing surface. The structure can be simplified, and the opening angle of the bonnet can be increased by the recess of the hinge member.

According to the present invention, a weight is provided at a rear portion of the machine body for balancing with a working device provided at a front portion of the machine body, and one end of the hinge member is supported by the weight and the bearing surface is provided. Since it is formed in the weight, it is possible to more stably hold the open bonnet by using the weight. Further, the present invention provides a step portion which is horizontal and flat on the upper surface of the machine body, an inclined portion which extends obliquely rearward and upward from the step portion, and a receiving portion which is substantially parallel to the step portion from the inclined portion to the rear end of the machine body. Since the lower edge of the bonnet can be mounted so as to have a shape adapted to the step portion, the inclined portion, and the receiving portion, the positioning when the bonnet is closed by the upper surface of the swivel body and the weight is formed. It can be surely performed and can stably maintain the closed state, and there is almost no gap between the bonnet and the body.

Further, according to the present invention, the lower edge of the bonnet is
Since the elastic seal material is provided, it is possible to more reliably prevent the gap between the bonnet and the machine body, reduce the impact when the bonnet is closed, and reduce engine sound leakage.

[Brief description of drawings]

FIG. 1 is a side view of a hinge device according to an embodiment of the present invention.

FIG. 2 is a rear view of the hinge device.

FIG. 3 is an overall side view of a backhoe.

FIG. 4 is a plan view of a backhoe.

FIG. 5 is a front view of a backhoe.

FIG. 6 is a right side view of the turning machine body.

FIG. 7 is a plan view of a turning machine body.

FIG. 8 is an exploded perspective view showing a weight mounting portion of the turning machine body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backhoe 3 Swinging body 4 Excavator 8A Step part 9 Weight 9A Inclined part 9B Receiving part 9D Opening peripheral wall 10 Opening 11 Bonnet 42 Hinge device 45 Hinge member 48 Biasing means 49 Recess 49a Bearing surface 50 Elasticity Seal material

Claims (5)

[Claims] 1. A bonnet (11) for covering equipment such as an engine (16) is provided on a machine body (3) of a working machine (1), and one side of this bonnet (11) is hinged to the machine body (3) side. In a bonnet support structure for a construction work machine which is openably and closably supported via (42), the hinge device (42) has one end rotatably supported on the machine body (3) side and the other end on the bonnet (11) side. The hinge body (45) fixed to the
When the bonnet (11) is opened, the hinge member (4
5) A bonnet support structure for a construction machine, wherein a bearing surface (50) for holding the open state of the bonnet (11) is formed by abutting against the bonnet (5). 2. An opening (10) for accommodating equipment such as an engine (16) is formed in the machine body (3), and the opening (1) is formed.
0), one end of the hinge member (45) is supported below the upper end of the peripheral wall (9D), and the recess (4) avoids the upper end of the peripheral wall (9D) when the hinge member (45) is rotated.
9) is formed on the hinge member (45), and the peripheral wall (9D) is formed.
The bearing surface (50) is formed on the
9) The bearing surface (49) that abuts the bearing surface (50) on one side.
The bonnet support structure for a construction work machine according to claim 1, wherein a) is formed. 3. The body (3) at the rear of the body (3)
A weight (9) for balancing with a working device (4) provided at the front of the hinge (45), one end of the hinge member (45) being supported by the weight (9) and the bearing surface (50).
2. The weight is formed on the weight (9).
Or the bonnet support structure in the construction work machine according to 2. 4. A step portion (8A) that is horizontal and flat on the upper surface of the machine body (3), an inclined portion (9A) extending obliquely rearward and upward from the step portion (8A), and the inclined portion (9A). And a receiving portion (50) substantially parallel to the step portion (8A) from the rear end of the airframe (3) to the bonnet (1).
1) The lower edge of the step portion (8A), the inclined portion (9
The bonnet support structure for a construction machine according to claim 1, wherein the bonnet support structure is formed so as to be mountable in a shape suitable for A) and the receiving portion (9B). 5. The bonnet support structure for a construction machine according to claim 4, wherein an elastic sealing material (52) is provided on a lower edge of the bonnet (11).