JP3679277B2 - Superstructure of swivel work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an upper structure of a turning work machine such as a backhoe.
[0002]
[Prior art]
For example, in a swivel work machine called a standard type, a small rear swivel type, or an ultra-small swivel type, an engine room with an engine arranged at the rear of the swivel is formed, and left and right from the rear surface of the engine room at the lower rear of the swivel. A weight having a substantially arc-shaped rear surface in plan view extending to the rear side surface is provided, and a cover body is provided which extends from the upper part of the engine room to the left and right side portions, and the left and right side lower edges are adjacent to the left and right side portions of the weight. The upper part of the engine room divided by the weight and the weight is covered with a rear bonnet having an upper pivot and a substantially arcuate rear surface in plan view, and the left and right sides of the swivel are covered with side covers.
[0003]
The lower end edge of the rear bonnet and the upper surface of the weight adjacent to the rear bonnet are formed in parallel, and have a horizontal line-shaped flat surface shape as disclosed in JP-A-11-1939 (Prior Art 1). Or it is the highest in the center part, and it is the back view circular arc shape which falls gradually from the center to right and left (prior art 2).
Further, the rear bonnet has a seal (weather strip) on the periphery, and a lock which is detachably engaged with a frame or a weight constituting the swivel base when closed at the rear lower portion.
[0004]
Furthermore , some cabins have a cabin that covers the driver's seat on the swivel, and a door that opens rearward is provided in this cabin.
[0005]
[Problems to be solved by the invention]
When the rear bonnet is pressed against the weight side so that the rear bonnet can be locked in close contact with the weight and the cover body, the upper part of the rear bonnet is pivotally supported and the lower edge is laterally extended from the rear. Due to the arc shape gradually leading forward, in both of the prior arts 1 and 2, the rear center part is greatly lowered from the left and right side parts, and the rear center part seal is over-squeezed, and the left and right side parts are raised. Or the bonnet trim attaching the seal may protrude.
[0006]
Further, the front part of the right and left side parts of the weight is at a position where it intersects with the rear part of the side cover and the lower part of the cover body, and a large gap is easily formed at the intersecting part, which may cause noise leakage.
Furthermore, the left and right side portions of the weight slightly protrude outward from the side surfaces of the side cover body and the rear bonnet, and when the cabin door is moved to the open position, the rear lower portion of the door interferes and the door opening degree May become smaller.
It is an object of the present invention to provide an upper structure of a turning work machine that can solve the problems of the prior art.
[0007]
An object of the present invention is to provide an upper structure of a turning work machine in which the relationship between a weight, a rear bonnet, a side cover body and the like is improved.
[0008]
[Means for Solving the Problems]
The first specific means for solving the problems in the present invention is that the engine room 3 is formed at the rear part of the swivel base 2, and the plan view from the rear surface of the engine room 3 to the left and right rear side surfaces is simplified at the rear lower part of the swivel base 2. A weight 4 having an arcuate back surface is provided, and a cover body 5 is provided which extends from the upper part of the engine room 3 to the left and right sides and the lower edges of the left and right sides are adjacent to the weight 4. The rear upper hood 6 is covered with a rear bonnet 6 having an upper surface pivotally supported and having a substantially arc-shaped rear surface in plan view, and a lower edge 6a of the rear bonnet 6 is formed in an arc shape that gradually decreases from the center to the left and right. The upper surface of the weight 4 adjacent to the lower end edge 6a is formed on the flat surface 4a at the substantially central portion in the left-right direction, and the left and right sides of the central flat surface 4a are formed on the arc surface 4b that gradually decreases. .
[0009]
Thereby, even if the lower end edge 6a of the rear bonnet 6 is pressed against the weight 4 and the cover body 5 for closing, the central flat surface 4a of the weight 4 is an extended surface of the arcuate surface 4b on the left and right sides thereof. The lower end edge 6a of the center part of the rear bonnet 6 can be lowered, and the rear bonnet 6 does not change at the center part, so that the left and right side parts do not rise.
In addition to the first specific means, the second specific means for solving the problems in the present invention is provided with a side cover 7 on at least one of the left and right sides of the swivel base 2, and the rear part of the side cover 7. Is adjacent to the front part of the weight 4 and the rear upper part is adjacent to the lower side of the cover body 5, and the rear edge of the side cover 7 and the lower side of the cover body 5 are formed from the front part of the side part of the weight 4 to the front upper part. That is, a cover joint portion 8 that overlaps the edge is formed.
[0010]
As a result, at the portion where the side front portion of the weight 4, the rear edge of the side cover 7, and the lower side edge of the cover body 5 intersect, the cover joint portion 8 has the rear edge of the side cover 7 and the lower side of the cover body 5. Since it overlaps with the edge, internal noise is difficult to leak to the outside.
The third specific means for solving the problem in the present invention is that the cabin 11 that covers the driver's seat 23 is mounted on the swivel base 2 in addition to the first or second specific means, and the cabin 11 is opened rearward. The door 12 is provided, and a notch 9 is formed in the front upper portion of the weight 4 to avoid interference with the door 12 opened rearward.
[0011]
Thereby, even if the door 12 that opens rearward is used for the cabin 11, the upper front side of the weight 4 does not interfere, and the degree of opening of the door 12 increases.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 7 shows a small rear swivel backhoe 15 exemplified as a swivel working machine. This backhoe 15 is a crawler traveling device 16, an upper body 17 having a swivel base 2, and an excavator provided at the front of the swivel stand 2. 26 and a cabin 11 mounted on the swivel base 2.
The crawler traveling device 16 has a swivel 2 mounted on an upper part of a track frame 18 via a swivel bearing 19 so as to be able to swivel about a swivel axis X, and a dozer 20 is mounted on a front part so as to be movable up and down. .
[0013]
The swivel base 2 is configured by fixing a support frame on a substrate and mounting an upper plate forming a step on the support frame. The swivel base 2 includes an engine 22, a driver's seat 23, and a control device 24. The driver's seat 23, the control device 24, and the like are covered with the cabin 11, and the upper body 17 is formed by these.
An excavator 26 is attached to the front portion of the swivel base 2 via a bracket 25 so as to be swingable about a vertical axis.
The excavator 26 pivotally supports the base end portions of the boom 28 and the boom cylinder 29 on a swing bracket 27 supported on the bracket 25 via a vertical axis, and pivots an arm 30 on the tip of the boom 28. The arm cylinder 31 is swingable, and a bucket 32 is pivotally supported at the tip of the arm 30 so that the bucket cylinder 33 can scoop and dump.
[0014]
1 to 5, a weight (counter weight) 4 is provided at the rear of the swivel base 2, and an engine 22 is mounted on the front side of the weight 4 and below the driver seat 23.
The engine room 3 in which the engine 22 is arranged is surrounded by a rear bonnet 6 and a cover body 5, and a driver's seat 23 is provided on the front side of these through an attachment base and a suspension device.
In the engine room 3, with the excavator 26 as the front side, the engine 22 is disposed sideways (the crankshaft is in the left-right direction), a multiple-type hydraulic pump 36 is drivably mounted on the right side, and a radiator 37 is mounted on the left side. Has been placed.
[0015]
A support frame 38 formed of pipe material or the like is provided on the swivel base 2 so as to straddle the engine 22, the hydraulic pump 36, the radiator 37, and the like, and an air cleaner 39 and other devices are mounted on the support frame 38. The front upper part of the rear bonnet 6 is mounted.
The rear bonnet 6 covers the upper rear and the rear of the engine room 3. The rear bonnet 6 is pivotally supported by the support frame 38 through a pivotal support 41 such as a hinge so that the rear bonnet 6 can swing around the horizontal axis, and the rear bonnet 6 is locked between the support frame or the weight 4 of the swivel base 2. A lock 42 is provided.
[0016]
The radiator 37 is a suction type, in which air is sucked into the engine room 3 from an air hole (not shown) on the left side of the rear bonnet 6 or the lower part of the swivel base 2, the engine 22 is cooled, and hot air is sent to the rear bonnet 6. Discharge outward from the right side. The fuel tank 43 is disposed inside the left side of the swivel base 2 on the air suction side.
The cover body 5 covers the left side and the upper part of the engine room 3 and covers the left cover body 5L fixed to the swivel base 2, the right side of the engine room 3 and the tank room 40, and swivels. A right cover body 5 </ b> R provided to be openable / detachable with respect to the base 2.
[0017]
A tank room 40 is formed on the right side opposite to the arrangement of the driver's seat 23 and on the front side of the hydraulic pump 36, and an oil tank 44 and a control valve 45 are arranged. The front, left side and right side are covered.
The left and right cover bodies 5L and 5R have a rear open shape on the rear side and a shape adjacent to the left and right side edges of the rear bonnet 6 with the rear side edge 5a closed.
[0018]
A reinforcing frame 46 is provided on the inner surface of the upper part of the right cover body 5R, and the front and lower parts of the reinforcing frame 46 are connected to the swivel base 2 through a pivot means 47 so as to be swingable around the horizontal axis. The upper part is detachably attached to the support frame 38 via a rear attachment means (catch tool) 48, and the rear attachment means 48 can be unlocked by opening the rear bonnet 6.
By opening the rear bonnet 6 and the right cover body 5R, the engine room 3 and the tank room 40 can be opened in a series of substantially L shapes in plan view.
[0019]
The rear bonnet 6 has a substantially arc-shaped rear surface in plan view, and the lower end edge 6a is formed in an arc shape that gradually decreases from the center to the left and right. The lower end edge 6a has a substantially continuous arc shape. A seal (weather strip) formed of rubber or the like is provided on the entire outer periphery including 6a.
The weight 4 is formed on an arcuate back surface having a plan view shape substantially parallel to the rear bonnet 6 and the rear portions of the left and right cover bodies 5L and 5R, and has side surfaces extending forward from the left and right ends of the arcuate back surface. The left and right cover bodies 5L and 5R protrude slightly outward from the rear part.
[0020]
The upper surface of the weight 4 adjacent to the lower end edge 6a of the rear bonnet 6 has a substantially central portion in the left-right direction formed on a substantially flat surface 4a, and a side arc gradually descending from the central flat surface 4a to the left and right. It is formed on the surface 4b.
In other words, the central upper surface of the weight 4 has a shape in which the arc surface is truncated so as to be lower than the surface extending from the arc surface 4b on the left and right side portions substantially parallel to the lower edge 6a of the rear bonnet 6 to the center side, The central flat surface 4a is lower than the extended surface of the left and right arcuate surfaces 4b and is substantially horizontal in a rear view, and the gap between the lower rim 6a of the rear bonnet 6 is larger than the gap with the arcuate surface 4b.
[0021]
Therefore, when the rear bonnet 6 is closed, the seal of the lower end edge 6a is loosened by the central flat surface 4a, and the circular arc surface 4b is properly compressed in the same manner as in the past, and the weight 4 and the rear bonnet 6 When there is a tolerance such as manufacturing error and assembly error, when the rear bonnet 6 is pressed against the weight 4 and the cover body 5, the seal is excessively pressed even if the lower end edge 6 a of the rear bonnet 6 is lowered. No, the central portion of the lower edge 6a escapes downward, so that the left and right side portions do not rise.
[0022]
As a result, the seal is not damaged, durability can be improved, and there is no gap between the rear bonnet 6 and the weight 4 and the cover body 5, and the rear bonnet 6 can be fit well. The relationship between the three is improved.
The upper surface of the weight 4 is an inclined surface that gradually increases from the outer peripheral side to the inner peripheral side, and the central flat surface 4a is also inclined upward inward from the outer peripheral side, but is formed on a horizontal plane without inclination. May be.
The swivel base 2 has a support frame attached to the upper side of the substrate, a step upper plate or the like is fixed to the upper side of the support frame, and side covers 7 are provided on the left and right sides to conceal the interior. .
[0023]
The left and right side covers 7L and 7R are formed of a thin plate of metal or synthetic resin, the rear end is adjacent to the front part of the weight 4, and the rear upper part is adjacent to the lower side of the left and right cover bodies 5L and 5R. Yes.
The weight 4 has a front cover joint portion 8a that overlaps inside the left and right side covers 7L and 7R at the front ends of the left and right side portions, and overlaps inside the lower side portions of the left and right cover bodies 5L and 5R at the front upper part. It has an upper cover joint portion 8b, and the front and upper cover joint portions 8a and 8b are located one step inside from the surface of the weight 4 and are integrally formed. The weight 4 and the left and right cover bodies 5L and 5R The joint between the left and right side covers 7L and 7R can be closed from the inside.
[0024]
As a result, the gaps between the weight 4, the left and right cover bodies 5L and 5R, and the left and right side covers 7L and 7R can be hidden so that noise in the engine room 3 does not leak to the outside. Can be.
The front and upper cover joint portions 8 a and 8 b may be provided only on one of the left and right sides of the weight 4.
3 and 4, reference numeral 9 denotes a notch formed in the vicinity of the upper cover joint portion 8 b of the weight 4. When the cabin 11 that covers the driver's seat 23 is mounted on the swivel base 2, the door 12 and the weight 4 It is formed to avoid interference.
[0025]
As shown in FIG. 6, the cabin 11 forms a frame by connecting the upper and lower ends of the left and right front struts 51, the left and right rear struts 52, and the intermediate strut 53 with left and right lateral members and front and rear lateral members. A roof member 54 is mounted on the frame, and a windshield 55, a rear glass, a side glass, and the like are provided and mounted on the turntable 2.
A space between the front left column 51 and the intermediate column 53 on the left side surface of the cabin 11 serves as an entrance / exit, and a sliding door 12 is provided at the entrance / exit. The door 12 is movable along a guide rail 56 disposed in the front-rear direction above and below the left side surface portion of the cabin 11.
[0026]
The door 12 includes a guided body 57 that is fitted to the upper and lower guide rails 56 and rolls or slides, and opening / closing link means 58. The opening / closing link means 58 is configured by connecting a first link 58A pivotally supported on the cabin 11 side and a second link 58B pivotally supported on the door 12 side.
Then, the door 12 swings around the guided portion 57 so as to move outward from the closed state shown by the solid line in FIG. 6 to a half-open state (shown by a two-dot chain line in FIG. 6). Thereafter, the guided portion 57 is guided by the guide rail 56 and is opened rearward so that the entire surface is opened.
[0027]
In this fully open state, the rear lower part of the door 12 is close to the front upper part of the left side of the weight 4 and slightly overlaps. The overlap portion is formed with a notch 9 that faces the door 12 so that the door 12 can move rearward without interfering with the weight 4 so that the entrance can be normally opened.
In addition, this invention is not limited to the said embodiment, A various deformation | transformation can be carried out. For example, the cabin 11 may be of a type in which the door is pivoted to the rear center and the front part is opened rearward, and a canopy, a lops, a sunshade device, etc. are provided behind the driver seat 23 of the swivel base 2 instead of the cabin 11. In this case, the notch 9 is not necessary, and a battery, a fuel tank 40, etc. are disposed in the tank room 40, or the radiator 37 is a front blowing type. May be.
[0028]
【The invention's effect】
According to the present invention described above, even if the rear bonnet 6 is pressed against the weight 4 and the cover body 5 for closing, the upper surface of the central portion of the weight 4 is more than the extended surface of the upper surfaces of the left and right side portions. Therefore, the lower end edge 6a of the center part of the rear bonnet 6 can be lowered, and the rear bonnet 6 can be prevented from being lifted at the left and right side parts by not being replaced at the center part.
[Brief description of the drawings]
FIG. 1 is a rear view of an upper body of a swing working machine showing an embodiment of the present invention.
FIG. 2 is a plan view of the weight.
FIG. 3 is a rear left side view of the upper body.
FIG. 4 is a plan view of the upper body.
FIG. 5 is a right side view of the upper body.
6 is a cross-sectional view taken along line YY in FIG.
FIG. 7 is an overall side view of a swivel working machine with a cabin.
[Explanation of symbols]
2 Turntable 3 Engine room 4 Weight 4a Center flat surface 4b Arc surface 5 Cover body 6 Rear bonnet 6a Lower edge 7 Side cover 8 Cover joint 11 Cabin 12 Door 15 Backhoe (Swivel work machine)
17 Upper body 22 Engine

Claims (3)

An engine room is formed at the rear of the swivel, and a weight having a substantially arcuate rear surface in plan view from the rear surface of the engine room to the left and right rear surfaces is provided at the lower part of the swivel. And a cover body whose left and right side lower edges are adjacent to the left and right side portions of the weight, and the rear upper part of the engine room partitioned by the cover body and the weight is supported by the upper pivot and has a substantially arc-shaped rear surface in plan view. Covering with a bonnet, providing a seal around the rear bonnet and forming the lower end edge of the rear bonnet in an arc shape gradually descending from the center to the left and right, and the upper surface of the weight adjacent to the lower end edge of the rear bonnet having this seal Is formed in a flat surface at a substantially central portion in the left-right direction, and a left and right side of the central flat surface is formed in a circular arc surface that gradually decreases. Part structure. A side cover is provided on at least one side of the swivel base, the rear part of the side cover is adjacent to the front part of the weight, and the rear upper part is adjacent to the lower part of the side of the cover body, from the front part of the side part of the weight. The upper structure of a swing work machine according to claim 1, wherein a cover joint portion is formed over the front upper portion so as to overlap the rear edge of the side cover and the lower side edge of the cover body. A cabin that covers the driver's seat is mounted on the swivel base, a door that opens rearward is provided in this cabin, and a notch that avoids interference with the door opened rearward is formed in the front upper side of the weight. The upper structure of the turning work machine according to claim 1 or 2, characterized in that

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