JP3859043B2 - Swivel frame in small swing hydraulic excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swing frame in a small swing type excavator such as a small backhoe.
[0002]
[Prior art]
A small swivel excavator to which the present invention is to be applied attaches a swing frame that is swingably mounted on a traveling device and a boom of an operating machine including a boom, an arm, a bucket, and the like so as to be able to undulate, and is attached to the front end of the swing frame. And a swing bracket that is supported so as to be swingable in the left-right direction. The revolving frame is divided into two parts by the front and rear partition plates, the driver's seat, work equipment, hydraulic equipment, etc. are installed in the front part, the engine is placed in the rear part and the axis of the crankshaft is in the horizontal direction. It is designed to be installed sideways. The rear side portion is further partitioned by a narrow partition plate in the left-right direction, and on the other hand, one side portion in the axial direction of the engine serves as a cooling installation area for installing a cooling device for sucking outside air. Yes.
[0003]
The base end portion of the swing cylinder that swings the working machine provided on the front end side of the above-mentioned swivel frame to the left and right is a front and rear section that divides the swivel frame back and forth as shown in Japanese Patent Laid-Open No. 64-14436. Usually, it is attached at a position on the front side of the partition plate.
[0004]
In the case of a small turning type turning frame in which the turning radius of the turning frame is kept within the width of the traveling device, the attachment of the base end portion of the swing cylinder is because the turning frame is narrowed as a whole. The distance between the mounting position of the swing cylinder and the swing bracket that swings the work machine is narrowed, and a swing cylinder with a small expansion / contraction stroke has to be used.
[0005]
[Problems to be solved by the invention]
In this case, there is a problem that the swing range of the work machine is narrower than the conventional one, and the same swing angle cannot be obtained regardless of the narrowing of the turning frame.
[0006]
The present invention has been considered in view of the above, and even with a swing frame that can be rotated slightly, a swing cylinder with a long stroke can be attached and a swing angle in the left-right direction of the work implement can be increased. The present invention also provides a swing frame in a small swing type hydraulic excavator that can increase the rigidity of the pivot portion of the swing cylinder, further improve the cooling efficiency of the engine cooling device, and allow sufficient cooling. It is the purpose.
[0007]
[Means for solving the problems and effects]
In order to achieve the above object, according to the first aspect of the present invention, a swing bracket is attached to the tip of the swing bracket so as to be able to swing in the horizontal direction, and a front and rear partition plate is fixed to an intermediate portion in the front and rear direction of the substrate. A small swivel type with the rear part partitioned by the plate divided into right and left by the narrow partition plate, and one side part of the rear end side partitioned by the front and rear partition partition plate and the narrow partition plate as the engine cooling installation area In a swing frame in a hydraulic excavator, a swing cylinder mounting base portion that supports a base end of a swing cylinder that swings the swing bracket is provided in the cooling installation region, and the front and rear partition plates face the swing cylinder mounting base portion. Cylinder window holes are provided, and the swing cylinder passes through the cylinder window holes in the front and rear partition plates and is within the cooling installation area. It has become the the construction attachment.
[0008]
According to the present invention, since the cooling installation area located on the rear side of the swing frame serves as a mounting portion on the base end side of the swing cylinder that swings the work implement, the swing of the hydraulic excavator that enables a small swing Even in the case of a frame, it is possible to attach a swing cylinder having a long stroke, and the swing angle in the left-right direction of the work implement can be increased.
[0009]
According to a second aspect of the invention for achieving the above object, in the invention of the first aspect, the substrate surface is separated from the substrate surface of the swivel frame in the height direction within the cooling installation region. A swing cylinder mounting plate that supports the base end of the parallel swing cylinder is provided, and the radiator installation stepladder plate can be attached to and detached from the side of the swing cylinder mounting plate so that it is substantially flush with the swing cylinder mounting plate. It is configured to be fixed to the substrate .
[0010]
According to the present invention, since the radiator installation stepladder is detachable, the swing cylinder can be attached before the radiator installation stepladder is attached, and the assembly trouble can be solved.
[0011]
The invention according to claim 3 for achieving the above object is that in the invention according to claim 2, the swing cylinder mounting plate is fixed to the corner portion of the narrow partition plate and the front and rear partition plates, The swing cylinder mounting base portion provided in the space between the swing cylinder mounting plate and the swing frame substrate is composed of pin bosses protruding from the opposing portions of the swing frame substrate and the swing cylinder mounting, According to this invention, it can be set as a highly rigid bearing part, and can provide a swing cylinder with intensity | strength.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a small backhoe to which the invention is to be applied. In FIG. 1, reference numeral 1 denotes a turning frame that is turnably mounted on a crawler-type traveling device 2. A swing bracket 3 is provided so as to be able to swing in the left-right direction. 4 is a swing cylinder connected to a swing arm 3a projecting to the right side of the swing bracket 3 for swinging. The swing cylinder 4 protrudes from a window hole provided in the front portion of the swing frame 1, The base end thereof is supported in the revolving frame 1 so as to be rotatable in the left-right direction.
[0015]
The swing bracket 3 is connected to a boom 5 of a work machine including a boom 5, an arm 6, and a bucket 7 so as to be raised and lowered, and a boom hydraulic cylinder for raising and lowering the boom 5 at the front portion of the swing bracket 3. The base end of 8 is supported. Reference numerals 9 and 10 denote hydraulic cylinders for operating the arm 6 and the bucket 7, respectively.
[0016]
The revolving frame 1 is as shown in FIGS. 2 to 4, and a fixed bracket 11 that supports the swing bracket 3 is provided at the front end thereof. In the revolving frame 1, a front / rear partitioning plate 12 that divides the revolving frame 1 in the front / rear direction is erected on the substrate 1 a of the revolving frame 1 at an intermediate portion in the front / rear direction.
[0017]
In the rear portion partitioned by the front and rear partition plates 12, two left and right fine partition plates 13 and 14 are separated in the left-right direction and directed in the front-rear direction. It is fixedly provided on the partition plate 12.
[0018]
The swivel frame 1 is provided with a control device and a driver's seat as shown in FIG. 1 in the central portion in front of the front and rear partition plates 12, for example, hydraulic equipment on the left side and pressure oil on the right side. A tank, a fuel tank, etc. are arranged. An engine 16 (FIG. 2) is mounted on the rear side of the front and rear partition plates 12 so that the rotation axis thereof is directed in the left and right (lateral) direction, and the cooling device is disposed on the right side. Reference numeral 1b denotes a motor mounting seat to which a turning motor is mounted.
[0019]
A corner portion partitioned by the right side narrow partition plate 14 and the front and rear partition partition plates 12 is a cooling installation region. As shown in FIGS. 3 to 6, this portion includes the surface of the substrate 1 a of the revolving frame 1. A swing cylinder mounting plate 15 that is spaced further in the height direction and parallel to the surface of the substrate 1a is fixedly provided on the front and rear partition plates 12 and the thin partition plate 14. Then, on the side of the swing cylinder mounting plate 15, a radiator installation stepladder plate 15 a is formed so as to be substantially flush with the swing cylinder mounting plate 15 and is fixed to the substrate 1 a of the revolving frame 1. A plurality of stepladders 15b are provided on the lower surface of the radiator installation stepladder plate 15a. Further, on the side of the radiator installation stepladder plate 15a, a bottom plate 18 is provided to be fixed to the radiator installation stepladder plate 15a and the front and rear partitioning partition plates 12. In this way, the swing cylinder installation space 17 configured on the lower side of the cooling installation area is partitioned by the swing cylinder mounting plate 15, the radiator installation stepladder plate 15a, and the bottom plate 18.
[0020]
A partition wall 19 is provided on the upper side of the radiator installation step plate 15a so as to partition the rear side partitioned by the front and rear partitioning partition plates 12 into left and right sides. A cooling installation region is provided on the front side (right side) of the partition wall 19. A substantially triangular cooling chamber 22 that is partitioned by the rear wall of the fuel tank 20 disposed on the front side, the radiator installation stepladder plate 15a, the bottom plate 18 and the outer wall and covered with the bonnet 21 is formed. . A large number of air holes 23 are provided in the bonnet 21. Inside the bonnet 21, packings 22 a, 22 b, 22 c... Having heat insulating properties and sound deadening properties are interposed between the members constituting the cooling chamber 22, and the periphery of the cooling chamber 22 is sealed. ing. Further, a similar packing is provided at a portion constituting the bottom plate of the cooling chamber 22.
[0021]
The back side (left side) of the partition wall 19 is an engine installation area. A large window hole 24 is provided at the center of the partition wall 19, and a radiator 25 is attached to the back side of the window hole 24, and an oil cooler 26 is attached to the front side. The lower portion of the radiator 25 is supported by the radiator installation stepladder plate 15a.
[0022]
In the swing cylinder installation space 17 in the cooling installation area, there is provided a swing cylinder mounting base shaft portion 28 that supports the base end of the swing cylinder 4 disposed on the right side portion of the swing frame 1 so as to be rotatable in the horizontal direction. A cylinder window hole 29 through which the swing cylinder 4 passes is provided in the front and rear partition plates 12 at positions corresponding to the swing cylinder mounting base shaft portion 28.
[0023]
The swing cylinder mounting base portion 28 is in a swing cylinder installation space 17 where the substrate 1a of the swing frame 1 and the swing cylinder mounting plate 15 face each other, and is constituted by pin bosses 30a and 30b projecting from both facing portions. The pin bosses 30a and 30b support a support shaft that supports the base end portion of the swing cylinder 4.
[0024]
The left and right narrow partition plates 13 and 14 are provided with piping window holes 31 and 32 connected to the swing cylinder installation space 17 provided on the lower side of the cooling installation region. A pipe window hole 33 is also provided at a position facing the installation space 17, and the pipe is connected from the swing cylinder installation space 17 to the fuel tank 20 and the pressure oil tank through the pipe window hole 33. Yes.
[0025]
In the above-described configuration, the base end portion of the swing cylinder 4 penetrates the cylinder window hole 29 of the front and rear partition plates 12 and is mounted in the swing cylinder installation space 17 formed below the cooling chamber 22 in the cooling installation region. The base shaft portion 28 is supported so as to be rotatable in the horizontal direction.
[0026]
Also, the piping connecting the hydraulic equipment installed at the rear center or rear left side of the swivel frame 1 with the fuel tank 20 and pressure oil tank installed on the right side is a piping provided on the left and right narrow partition plates 13 and 14. Through the window holes 31 and 32, the swing cylinder installation space 17 is formed on the lower side of the cooling installation area, and piping is performed from here through the piping window holes 33 provided in the front and rear partition plates 12.
[0027]
During operation of the engine 16, the cooling air from the cooling fan is taken into the cooling chamber 22 from the vent hole 23 of the bonnet 21, and then flows into the engine installation region through the oil cooler 26 and the radiator 25. At this time, the cooling chamber 22 is configured with the radiator installation stepladder plate 15a, the bottom plate 18 and the partition wall 19, the fuel tank 20, and the packing so that the air passing through the radiator 25 enters the cooling chamber 22 again. There is no backflow. Further, the warm air from the engine installation area that has leaked into the swing cylinder installation space 17 of the revolving frame 1 does not enter the cooling chamber 22 side.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing a small backhoe to which the present invention is applied.
FIG. 2 is a rear view schematically showing a small backhoe to which the present invention is applied.
FIG. 3 is a plan view showing an example of a main part of the present invention.
4 is a view as seen from an arrow A in FIG. 3;
5 is a cross-sectional view taken along the line B-B in FIG. 3;
FIG. 6 is a perspective view showing an example of a main part of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Swing frame 1a ... Board | substrate 1b ... Motor mounting seat 2 ... Traveling apparatus 3 ... Swing bracket 3a ... Swing arm 4 ... Swing cylinder 5 ... Boom 6 ... Arm 7 ... Bucket 8, 9, 10 ... Hydraulic cylinder 11 ... Fixed bracket 12 ... front and rear partition plates 13 and 14 ... thin partition plate 15 ... swing cylinder mounting plate 15a ... radiator installation stepladder plate 15b ... stepladder 16 ... engine 17 ... swing cylinder installation space 18 ... bottom plate 19 ... partition wall 20 ... fuel tank 21 ... bonnet 22 ... Cooling chambers 22a, 22b, 22c ... Packing 23 ... Vent hole 24 ... Window hole 25 ... Radiator 26 ... Oil cooler 28 ... Swing cylinder mounting base 29 ... Cylinder window holes 30a, 30b ... Pin bosses 31, 32, 33 ... Piping Window hole.

Claims (3)

A swing bracket (3) is attached to the tip so as to be able to swing in the horizontal direction, and a front and rear partitioning partition plate (12) is fixed to an intermediate portion in the front and rear direction of the substrate (1a), and the front and rear partitioning partition plates (12) are used for partitioning. The rear side portion is divided into left and right by the fine partition plates (13, 14), and one side portion of the rear end side partitioned by the front and rear partition plates (12) and the fine partition plates (13, 14) is engine. In the swing frame (1) in the small swing hydraulic excavator as the cooling installation area of (16),
A swing cylinder mounting base shaft portion (28) for supporting a base end of a swing cylinder (4) that swings the swing bracket (3) is provided in the cooling installation area, and a swing cylinder is provided on the front and rear partitioning partition plates (12). A cylinder window hole (29) facing the mounting base part (28) is provided, and the swing cylinder (4) is installed in the cooling installation area through the cylinder window hole (29) of the front and rear partition plates (12). A swivel frame in a small swivel excavator characterized by the above. In the cooling installation area, a swing cylinder mounting plate (supporting the base end of the swing cylinder (4) spaced in the height direction from the substrate (1a) surface of the swivel frame (1) and parallel to the substrate (1a) surface ( 15) , and the radiator installation stepladder plate (15a) is detachably mounted on the side of the swing cylinder mounting plate (15) so as to be substantially flush with the swing cylinder mounting plate (15). The swivel frame in the small swivel excavator according to claim 1, wherein the swivel frame is fixed to the swivel.   The swing cylinder mounting plate (15) is fixed to the corners of the narrow partition plate (14) and the front and rear partition plates (12), and the swing cylinder mounting plate (15) and the substrate (1a) of the swivel frame (1). Pin bosses (30a, 30b) provided with swing cylinder mounting base shafts (28) provided in the space between the pivoting frame (1) and the board (1a) and swing cylinder mounting plate (15) facing each other. The swing frame in the small swing type hydraulic excavator according to claim 2, wherein

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