JP3973446B2 - Upper swing body of work equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an upper swing body of a work machine.
[0002]
[Prior art]
FIG. 8 is a side view of a hydraulic excavator (work machine). In the figure, a is a crawler type traveling body, b is a swivel bearing, c is an upper revolving body, d is a boom, e is an arm, f is a bucket, and g is a canopy. The upper swing body c is formed by placing an engine or the like on a swing frame and covering it with an upper outer shell h and a lower outer shell i. The upper outer shell h is supported by an outer shell support frame (not shown). The outer shell support frame is a portal frame that is erected on the revolving frame and is relatively small and obstructs the inspection work of the engine. FIG. 9 is a perspective view disclosed in Japanese Patent Application Laid-Open No. 2000-186344, which has been devised to solve such problems and has been filed earlier.
[0003]
As shown in the figure, the upper swing body of the working machine includes a swing frame 16 supported by the traveling body, a lower outer shell 17 provided so as to surround the swing frame 16 in the circumferential direction, and a rear of the swing frame 16. A belt-shaped, gate-shaped outside having column portions 18 and 19 attached to both sides of the end so that the lower end portion is connected to the outer surface of the lower outer shell 17 and a connecting portion 20 connecting the upper end portions of the both column portions 18 and 19. The rear upper part connected to the connecting part 20 of the outer shell support frame 21 via the hinge 22 so as to be in contact with the rear side edge of the outer shell support frame 21 and the upper edge of the lower outer shell 17. An outer shell 23 and a seat base 24 attached to the outer shell support frame 21 so as to be positioned on the front side of the outer shell support frame 21 are provided. The lower outer shell 17 is divided into a side surface portion 17a and a rear portion (counter weight) 17b.
[0004]
The outer shell support frame 21 is formed by casting.
[0005]
Further, the seat base 24 is formed so as to be in contact with the edge of the seat base 24 near the center of the body, the upper edge of the lower outer shell 17, and both side edges of the connecting portion 20 of the outer shell support frame 21. The middle upper shell 26 connected to the edge near the center of the fuselage, the partition wall 27 attached to the revolving frame 16 so that the front side edge of the middle upper shell 26 can contact, and the upper edge of the lower outer shell 17 A front upper outer shell 29 connected to the partition wall 27 via a hinge 28 is provided.
[0006]
As described above, the outer shell support frame 21 is enlarged to form a part of the outer shell, and the rear upper outer shell 23 is connected to the outer shell 23 via the hinge 22. Is easier to do.
[0007]
[Problems to be solved by the invention]
However, since the outer shell support frame 21 and the counterweight 17b are both cast products, they are separately cast, so that the cost increases. Further, since the outer shell support frame 21 and the counterweight 17b are separately bolted to the revolving frame 16, it takes time to assemble. Furthermore, since the column portions 18 and 19 of the outer shell support frame 21 are exposed to the outside, the degree of freedom in designing the outer shell covers is impaired.
[0008]
The present invention was devised as an improved invention of Japanese Patent Application Laid-Open No. 2000-186344 in view of such problems of the prior art, and casting and assembling by integrally casting an outer shell support frame and a counterweight. An object of the present invention is to provide an upper swing body of a working machine that reduces costs and secures the degree of freedom of design of covers by inserting columns on both sides of an outer shell support frame inside the covers.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the upper swing body of the working machine of the present invention has a rear frame in which a gate-shaped outer shell support frame is integrally formed on the upper portion of the counterweight, and the swing frame supported by the traveling body. It is attached to the rear part.
[0010]
Preferably, the upper surface of the outer shell support frame forms part of the outer shell, and the struts on both sides are inside the rear engine cover or the side cover on the side.
[0011]
The rear edge of the beam member on the upper part of the outer shell support frame is a curved line projecting rearward, and the engine cover is attached to the rear edge via a slide hinge.
[0012]
The front end of the upper surface of the outer shell support frame is preferably formed with a recess for accommodating the rear portion of the cab seat.
[0013]
Next, the operation of the present invention will be described. Since the outer shell support frame and the counterweight are integrally cast, the cost is reduced as compared to casting them separately, and the mounting to the swivel frame is facilitated. Since the struts on both sides of the outer shell support frame are inside the covers, the degree of freedom in design of the external appearance is increased, and it is easy to become a working machine with an attractive design.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view of the rear frame as viewed from the rear, FIG. 2 is a perspective view of the rear frame as viewed from the front, and FIG. 3 is a perspective view of the upper swing body of the working machine of the present invention. In these drawings, 1 is an upper swing body, 2 is a swing frame, 3 is a rear frame, 4 is an engine cover, 5 is a side cover, 6 is a canopy, and 7 is a seat of a seat. The rear frame 3 is obtained by integrally casting a counterweight 3a forming a rear lower portion of the outer shell and a gate-shaped outer shell support frame 3b. The outer shell support frame 3b includes an upper beam member 3d and support columns 3c and 3c on both sides for supporting the beam member 3d.
[0015]
The struts 3c on both sides of the outer shell support frame 3b are formed by being slightly retracted inward as shown in the figure. An upper beam member 3d of the outer shell support frame 3b forms a part of the outer shell of the upper swing body 1, and a rear edge 3e thereof has an arc shape. The front part of the upper surface of the beam member 3d is a recess 3g that accommodates the rear part of the seat of the driver's seat. Seats 3i for the canopy 7 are formed at both ends of the beam member 3d.
[0016]
As shown in FIG. 2, substantially triangular brackets 3f and 3f projecting inward are integrally formed inside the counterweight 3a. A hole 3h is formed at the tip of the bracket 3f. In order to attach the rear frame 3 to the revolving frame 2, as shown in FIG. 4, a bracket 3f is placed on a seat 2a provided at the rear end of the revolving frame 2, and is fastened with bolts.
[0017]
As shown in FIGS. 3 and 6, the engine cover 4 is attached to the rear edge 3 e of the beam member 3 d via a slide hinge 8. 6 indicates a state in which the engine cover 4 is opened. That is, since the rear edge 3e has an arc shape, a normal hinge cannot be used, and a slide hinge 8 whose fulcrum moves back and forth when opening and closing is necessary. The slide hinge 8 has a structure shown in FIG.
[0018]
Hereinafter, the slide hinge 8 will be described. Reference numerals 8a and 8b denote angle members fixed to the rear edge 3e of the beam member 3d and the upper end of the engine cover 4, respectively. J-shaped link members 8c and 8d are swingably attached to the center and right end of the flange of the angle member 8a by pins 8g and 8h, respectively. Link members 8e and 8f are swingably attached to the upper end of the angle member 3b and below the L member by pins 8m and 8n, respectively. The lower end of the link member 8c and the lower left end of the link member 8e are rotatably connected by a pin 8i, and the lower end of the link member 8d and the lower left end of the link member 8f are connected by a pin 8k. The intermediate part of the link member 8d and the intermediate part of the lower side of the link member 8e are connected by a pin 8j. The pins 8g, 8h, 8j and 8i form a parallelogram, and the pins 8m, 8n, 8k and 8i also form a parallelogram. That is, two parallel links are combined and connected by a pin 8i, thereby realizing opening and closing and parallel movement of the base end portion of the engine cover 4.
[0019]
Next, attachment of the side cover 5 will be described. As shown in FIG. 7, the side cover 5 is supported so as to be openable and closable by a hinge 9 attached to the upper end of a substantially L-shaped bracket 2b. In addition, the dashed-dotted line of FIG. 7 has shown the state which the side cover opened. The movable part 9a of the hinge 9 is shaped like the arithmetic numeral 3, and is flexible and allows some deformation. A rubber seal 5a is attached to the lower end of the side cover 5, and when the side cover 5 is closed, the side cover 5 is deformed in contact with the upper end of the skirt 10, and is sealed by the elasticity of rubber. Further, as shown in FIG. 3, the rear end 5 b of the side cover 5 is curved inward and covers the outer surface of the column 3 c of the rear frame 3.
[0020]
Next, the operation of this embodiment will be described. Since the outer shell support frame 3b and the counterweight 3a are integrally cast, the cost is reduced as compared to casting them separately, and attachment to the revolving frame 2 is facilitated. Since the struts 3c on both sides of the outer shell support frame 3b are inside the covers, the degree of freedom in design of the external appearance is increased and it is easy to become a working machine with an attractive design.
[0021]
The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention. For example, the support column 3c is covered by the side cover 5, but it may be covered by the engine cover 4, and the tangent line (parting line) between the engine cover 4 and the side cover 5 is inclined outside the support column 3c. May be.
[0022]
【The invention's effect】
As described above, the upper rotating body of the working machine according to the present invention integrally casts the counterweight and the outer shell support frame, and slightly retracts the support column of the outer shell support frame. Reductions can be achieved, and there are excellent effects such as an increase in the degree of freedom in designing the covers of the outer shells and the ease of design.
[Brief description of the drawings]
FIG. 1 is a perspective view seen from the rear of a rear frame of an upper swing body of a working machine according to the present invention.
FIG. 2 is a perspective view of the rear frame as viewed from the front.
FIG. 3 is a perspective view of an upper swing body of the present invention.
FIG. 4 is a side view showing a state in which a rear frame is attached to a revolving frame.
FIG. 5 is an assembly drawing of a slide hinge.
FIG. 6 is a cross-sectional view showing a state where the engine cover is attached.
FIG. 7 is a cross-sectional view showing a side cover attached state.
FIG. 8 is a side view of a work machine (hydraulic excavator).
FIG. 9 is a perspective view of a conventional upper swing body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper revolving body 2 Revolving frame 3 Rear frame 3a Counter weight 3b Outer shell support frame 3c Support | pillar 3d Beam member 4 Engine cover 5 Side cover 8 Slide hinge 9 Hinge

Claims (2)

  A portal-type outer shell support frame consisting of an upper beam member and a pair of support columns that support it on both sides from below is integrally formed on the upper part of the counterweight that forms the lower outer shell behind the upper swing body. The rear frame is attached to the rear part of the revolving frame supported by the traveling body, and a seat for a canopy is formed on the upper surface of the outer shell support frame and a part of the outer shell is formed. The pair of struts on both sides are inside the engine cover on the rear side or the side cover on the side, or inside both sides across the boundary of those covers, and the beam members on the upper part of the outer shell support frame The rear edge protrudes rearward, and is a curve with the same shape as the top and bottom of the counterweight, and the upper front end of the outer shell support frame is formed with a recess that accommodates the rear part of the cab seat. And it has an upper swing body of the working machine, wherein the position of the front end position and counterweight of the front end of the upper beam member is approximately the same.   An engine cover is attached via a slide hinge to the rear edge of the curve projecting rearward of the upper beam member of the outer shell support frame, and the slide hinge is a combination of two parallel links. The upper turning body of the working machine according to claim 1, wherein opening and closing and translation of the base end portion thereof are enabled.

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