JP2006328863A - Mounting structure of cylinder guard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently secure the maximum lift amount of a blade device while installing a cylinder guard on the hydraulic cylinder of the blade device of a work machine. <P>SOLUTION: The hydraulic cylinder 30 comprises projected portions 36a and 36b for hydraulic ports 34a and 34b disposed projectedly from the hydraulic cylinder 30 in directions excluding the vertical upper direction, and bolt holes are formed in the projected portions 36a and 36b. The cylinder guard 20 is installed on the hydraulic cylinder 30 with bolts 37 fastened to the bolt holes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylinder guard mounting structure for protecting a blade device mounted on a work machine such as a hydraulic excavator.

Generally, in a working machine such as a hydraulic excavator, as shown in FIG. 7, a lower traveling body in which an upper swing body is pivotally supported so as to be able to perform earth and sand transportation, excavation, leveling, and the like. There is a frame 2 to which a blade device 1 is attached.
The blade device 1 includes a rectangular blade body 11 that is long to the left and right when viewed from the front, an arm 12 having one end fixed to the back of the blade body 11 and the other end supported by the lower traveling body frame 2, a blade body 11 and a blade hydraulic cylinder (hereinafter referred to as a blade cylinder) 13 interposed between the lower traveling body frame 2 and the lower traveling body frame 2. Then, by operating and controlling the flow of hydraulic oil flowing to the blade cylinder 13 in the operator room, the blade cylinder 13 is expanded and contracted, and the blade body 11 is moved up and down.

  When the work such as leveling is performed by the blade device 1, earth and sand on the front surface of the blade body 11 may get over the blade body 11 and fall to the back side (rear side) of the blade body 11. Therefore, in order to prevent the blade cylinder 13 located on the back side of the blade body 11 and its hydraulic piping (not shown) from being damaged by the earth and sand, the blade cylinder 13 is provided with a cylinder guard (covering and protecting them). A technique for providing the cover member 14 is disclosed in Patent Document 1, for example.

As an attachment structure of the cylinder guard 14, for example, as shown in FIG. 6, a boss 15 is welded to the upper surface of the blade cylinder 13, and the cylinder guard 14 is fastened to the boss 15 with a bolt 16.
JP-A-10-219732

However, as described above, in the technique of assembling the cylinder guard 14 via the boss 15 on the upper surface of the blade cylinder 13, as shown in FIGS. and the protruded upward than an outer diameter R of the tube, only this minute clearance L _a between the cylinder guard 14 and the swing frame (revolving frame of the upper rotating body) 3 and structures such as the swing post 4 is reduced .

On the other hand, an attempt to ensure sufficient clearance L _A, it is necessary to limit the maximum lift amount B of the blade unit 1. It is preferable that the maximum lift B of the blade device 1 is originally secured to some extent, and when the maximum lift B of the blade device 1 is small, that is, when the position is raised to the maximum, workability and running performance are reduced. It is not preferable because the properties are lowered.
The present invention has been devised in view of such problems, and a cylinder guard mounting structure capable of sufficiently securing the maximum lift amount of the blade device while mounting the cylinder guard on the hydraulic cylinder of the blade device. The purpose is to provide.

  In order to achieve the above object, the cylinder guard mounting structure of the present invention according to claim 1 provides a cylinder guard for the hydraulic cylinder for protecting a hydraulic cylinder that drives a blade device (blade device main body) of a work machine. The hydraulic cylinder is provided with a protruding portion for a hydraulic port disposed so as to protrude from the hydraulic cylinder in a direction avoiding the vertically upward direction, and a bolt hole is formed in the protruding portion. The cylinder guard is attached to the hydraulic cylinder by a bolt fastened to the bolt hole.

A cylinder guard mounting structure according to a second aspect of the present invention is the cylinder guard mounting structure according to the first aspect, wherein the protruding portion is disposed obliquely upward with respect to the airframe. It is said.
A cylinder guard mounting structure according to a third aspect of the present invention is the cylinder guard mounting structure according to the second aspect, wherein a head side hydraulic port and a rod side hydraulic port are provided as the hydraulic ports, and the head side hydraulic pressure is The port projection is inclined to either the left or right of the hydraulic cylinder, and the rod-side hydraulic port projection is inclined to the left or right of the hydraulic cylinder.

  According to the cylinder guard mounting structure of the present invention as set forth in claim 1, the projecting portion for the hydraulic port, which is disposed so as to project from the hydraulic cylinder in the direction avoiding the vertically upward direction, Holes are drilled and the cylinder guard is attached to the hydraulic cylinder with bolts fastened to the bolt holes, so that the cylinder guard can be attached to the hydraulic cylinder in close contact with the cylinder guard, swing frame, swing post, etc. A larger clearance from the structure can be secured. Therefore, it is possible to sufficiently secure the maximum amount of increase of the blade device while attaching the cylinder guard to the blade device.

  In addition, since the projecting portion for the hydraulic port is used, the number of parts required for mounting the cylinder guard can be reduced compared with the conventional technique in which the boss is welded to the hydraulic cylinder, thereby reducing the cost. it can. Furthermore, since the number of welding sites can be reduced, the influence of welding heat on the hydraulic cylinder can be reduced, and the strength of the hydraulic cylinder can be improved.

  According to the cylinder guard mounting structure of the present invention as set forth in claim 2, when the projecting portion for the hydraulic port is directed to a position other than vertically upward, for example, both ends are bent into the cylinder guard as mounting portions to the projecting portion. However, since the projecting portion is disposed obliquely upward with respect to the airframe, the size of the bent portion is smaller and the bending process is performed, for example, compared to the case where the protruding portion is disposed sideways. , And the cylinder guard can be easily manufactured with a relatively simple shape.

  According to the cylinder guard mounting structure of the third aspect of the present invention, the cylinder guard is supported at two points on the left and right sides, and the support can be further stabilized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a blade device of a work machine according to an embodiment of the present invention, FIG. 1 is an enlarged front view of a main part thereof, and FIG. 2 is a diagram showing an elbow that is a component of the blade device. 3 is a view showing a blade cylinder and a cylinder guard of the blade device, and FIG. 4 is a side view showing the blade device. Note that the same members and the like as those of the prior art are denoted by the same reference numerals, and the drawings used for explanation of the prior art are appropriately used for explanation.

  As shown in FIG. 4, the blade device 1 includes a rectangular blade body 11 that is long to the left and right when viewed from the front, and a distal end portion (one end portion) fixed to the back surface of the blade body 11 and a proximal end portion (the other end portion). Is a pair of left and right arms 12 supported by the lower traveling body frame 2, a blade hydraulic cylinder (blade cylinder) 30 interposed between the blade body 11 and the lower traveling body frame 2, and an upper surface of the blade cylinder 30. A blade cylinder guard (hereinafter referred to as a cylinder guard) 20 for covering is provided.

  The base ends of the pair of left and right arms 12 are connected to a pair of left and right arm brackets 5 fixed to the lower traveling body frame 2 so as to be swingable up and down by pins 5a. The cylinder bracket 6 is fixed to the lower traveling body frame 2 so as to be positioned at the center (substantially center) of the pair of arm brackets 5, and the base end portion of the rod 33 of the blade cylinder 30 described later is used for the cylinder. The bracket 6 is connected to the bracket 6 by a pin 6a so as to be swingable up and down.

  As shown in FIG. 1, the cylinder guard 20 includes a rectangular top plate 20a and a pair of side plates 20b, 20b extending in the axial direction formed by bending both widthwise ends of the top plate 20a. It is configured. When the blade device 1 performs operations such as earth and sand transportation, excavation, and leveling, the earth and sand may get over the blade body 11 and fall to the back side of the blade body 11. Since the blade cylinder 30 is covered by the top plate 20a and the side plates 20b and 20b, damage to the blade cylinder 30 located on the back side of the blade body 11 and its hydraulic piping (not shown) due to earth and sand is prevented. It can be prevented.

  As shown in FIGS. 3A and 3B, the blade cylinder 30 is integrally fixed to the cylinder tube 31, a piston 32 slidably fitted on the inner peripheral surface of the cylinder tube 31, and the piston 32. The piston rod 33 is provided, and a head side oil chamber 35a and a rod side oil chamber 35b are formed on both sides in the axial direction of the piston 32 inside the cylinder tube 31 with the piston 32 as a boundary.

  Further, the cylinder tube 31 is provided with a pair of supply / exhaust ports 34a and 34b through which hydraulic oil (pressure oil) supplied to the inside enters and exits, and one port (head side hydraulic port) is provided in the head side oil chamber 35a. ) 34a is connected, and another port (rod side hydraulic port) 34b is connected to the rod side oil chamber 35b. As shown in FIG. 1, the oil passages of these supply / exhaust ports 34a and 34b are both elbows for piping as projecting portions disposed obliquely upward with respect to the machine body (and cylinder tube 31). (Pressure oil joints, hereinafter simply referred to as elbows) 36a and 36b are provided in an L shape.

  The elbows 36a and 36b constituting the supply / discharge ports 34a and 34b have a shape as shown in FIG. 2, and as shown in FIGS. 1 and 3B, the elbows 36a and 36b are provided for the head side hydraulic port 34a. The elbow 36a is disposed to be inclined in the upper right oblique direction on the right end of the outer peripheral surface of the cylinder tube 31 on the blade body 11 side and in a top view. An elbow 36b for the rod-side hydraulic port 34b is disposed on the rod-side base end portion of the outer peripheral surface of the cylinder tube 31 and on the left side when viewed from above, and is inclined in the upper left oblique direction. Here, the left and right are directions when viewed from the front of the aircraft. One end of a hydraulic pipe (not shown) is connected to each of the elbows 36a and 36b. The hydraulic pipe is connected to the head side oil via the supply / discharge ports 34a and 34b inside the elbows 36a and 36b. It communicates with the chamber 35a and the rod side oil chamber 35b.

The piston 32 moves in the cylinder tube 31 based on the supply and discharge of the hydraulic oil to and from the oil chambers 35a and 35b through the hydraulic piping and the supply / discharge ports 34a and 34b. The blade body 11 is moved up and down along with the operation.
Further, bolt holes 36c and 36c are formed in the elbows 36a and 36b, respectively. That is, in this embodiment, the cylinder guard mounting boss 15 (see FIG. 6) welded to the upper surface of the conventional cylinder tube is eliminated, and the existing protrusion portion welded to the supply / discharge ports 34a and 34b is used. A certain elbow is formed into large elbows 36a and 36b as shown in FIG. 2, and bolt holes 36c that function as cylinder guard fastening portions together with the supply / discharge ports 34a and 34b are provided inside the elbows 36a and 36b. Then, it is attached to the blade cylinder 30 by a bolt 37 fastened to the bolt hole 36c.

Since the cylinder guard mounting structure according to the embodiment of the present invention is configured as described above, the following operations and effects are obtained.
Bolt holes 36c are provided in the elbows 36a, 36b constituting the supply / discharge ports 34a, 34b, and the side plate 20b portion of the cylinder guard 20 is fastened to the blade cylinder 30 and the bolts 37 are fastened to the bolt holes 36c by nuts and washers. Since the elbows 36a and 36b are disposed obliquely upward with respect to the blade cylinder 30, as shown by solid lines in FIG. 4, the elbows 36a and 36b are located above the blade cylinder 30. The cylinder guard 20 can be attached close to the blade cylinder 30 so as to be in close contact with the upper surface of the blade cylinder 30. Therefore, when the blade body 11 is lifted, the clearance L _B (see FIG. 1) between the cylinder guard 20 and the structure such as the swing frame 3 and the swing post 4 can be secured, and the maximum amount of increase of the blade device 1 is increased. It becomes possible to secure B sufficiently.

  Conventionally, the boss 15 is fixed to the upper surface of the cylinder tube 31 in order to attach the cylinder guard 20. However, the cylinder guard 20 is attached by improving the elbows 36a, 36b of the supply / discharge ports 34a, 34b. The number of parts required for mounting the cylinder guard 20 can be reduced, and as a result, the cost can be reduced. Furthermore, since the number of welded parts can be reduced, the influence of welding heat on the cylinder tube 31 can be reduced, and the strength of the blade cylinder 30 can be improved.

  The elbow 36a constituting the head-side hydraulic port 34a is disposed on the right side and the distal end portion when viewed from above, and the elbow 36b constituting the rod-side hydraulic port 34b is disposed on the left side and proximal end portion when viewed from above. The cylinder guard 20 is fastened by using the bolt holes 36c and 36c formed in the two elbows 36a and 36b separately arranged on the left and right and both ends as described above. It is supported at a point and has a relatively good balance, and the support can be stabilized.

  Since the elbows 36a and 36b are disposed obliquely upward with respect to the blade cylinder 30, a pair of cylinder guards 20 formed by bending the rectangular top plate 20a and the top plate 20a. It can be formed in a simple shape including the side plates 20b and 20b. That is, the bending process for forming the side plates 20b, 20b, which are the fastening portions of the cylinder guard 20, is only required once, and the size can be reduced compared to that of FIG. Can be manufactured.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention.
For example, in the present embodiment, the piping elbow 36 for the supply / discharge ports 34a and 34b has a shape as shown in FIG. 2, but a cylinder comprising a supply / discharge port and a bolt hole and including a bolt hole. As long as it is possible to attach the cylinder guard close to the upper surface of the cylinder tube by the guard fastening portion, the shape is not limited to that shown in FIG. Moreover, in this embodiment, although the elbow type thing was taken up as a projection part which comprises a supply / discharge port, the projection part which comprises a supply / exhaust port is not restricted to an elbow type.

Further, in this embodiment (see FIG. 1), the elbows (projections) 36a and 36b are disposed obliquely upward with respect to the airframe, but as shown in FIG. 5, the elbows 36a and 36b are Further, it may be arranged so as to be in a horizontal direction (toward the side) with respect to the aircraft. That is, the elbows 36a and 36b only have to protrude in a direction avoiding the vertically upward direction. Thus elbow 36a, if disposed 36b, a clearance L _B between the cylinder guard 20 and the swing frame 3 and the swing post 4 can be sufficiently secured, also possible to sufficiently ensure maximum amount of increase in the blade device Can do.

Further, one blade cylinder and one cylinder guard are provided in the present embodiment, but the number of these is not limited to one. For example, a configuration may be employed in which a plurality of blade cylinders and the same number of cylinder guards as the plurality of blade cylinders are provided, and a cylinder guard is installed in each blade cylinder.
Further, for example, two blade cylinders may be provided, and the two blade cylinders may be covered with one cylinder guard. In this case, for example, the blade cylinder is mounted on each of two arms interposed from the blade body to the lower traveling body frame, and serves as an elbow for fastening the cylinder guard. One cylinder guard has two points at the left and right and at both ends, using the elbow that forms the side port and is arranged outward and the elbow that forms the rod side port of the other blade cylinder and is arranged outward It can be supported to cover two blade cylinders. Of course, four points may be supported using all four elbows constituting the port of each blade cylinder. In this case, it is preferable that all elbows are inclined outward.

It is a principal part enlarged front view of the blade apparatus which concerns on one Embodiment of this invention. It is the elbow single figure of the blade apparatus which concerns on one Embodiment of this invention, (a) is the side view, (b) is the top view, (c) is the perspective view. FIG. 1 shows a part of a blade device according to an embodiment of the present invention, in which (a) is a side view thereof and (b) is a top view thereof. It is a side view which shows the blade apparatus which concerns on one Embodiment of this invention. It is a principal part enlarged front view of the braid | blade apparatus which concerns on other embodiment of this invention. It is a principal part enlarged front view of the blade apparatus which concerns on the prior art of this invention. It is a perspective view which shows the blade apparatus which concerns on the prior art of this invention. It is a side view which shows the blade apparatus which concerns on the prior art of this invention.

Explanation of symbols

1 Blade device 2 Lower traveling body frame 3 Swing frame (upper revolving body frame)
4 Swing Post 5 Arm Bracket 5a Pin 6 Cylinder Bracket 6a Pin 11 Blade Body 12 Arm 13 Blade Hydraulic Cylinder (Blade Cylinder, Hydraulic Cylinder)
14 Blade cylinder guard (cylinder guard)
15 Boss 16 Bolt 16a Bolt Head 20 Blade Cylinder Guard (Cylinder Guard)
20a Top plate 20b Side plate 30 Hydraulic cylinder for blade (blade cylinder, hydraulic cylinder)
31 Cylinder tube 32 Piston 33 Rod 34a Head side hydraulic port (supply / discharge port)
34b Rod side hydraulic port (supply / discharge port)
35a Head side oil chamber 35b Rod side oil chamber 36 Piping elbow (elbow, pressure oil joint, protrusion)
36a Head side elbow 36b Rod side elbow 36c Bolt hole (cylinder guard fastening part)
37 bolt B blade device maximum lift amount D blade body width H blade body height L _A of the outer diameter of the clearance R cylinder tube with L _B blade cylinder guard and the swing frame and the swing post

Claims (3)

In a structure in which a cylinder guard is attached to the hydraulic cylinder in order to protect the hydraulic cylinder that drives the blade device of the work machine,
The hydraulic cylinder is provided with a protruding portion for a hydraulic port disposed so as to protrude from the hydraulic cylinder in a direction avoiding a vertically upward direction, and a bolt hole is formed in the protruding portion,
The cylinder guard mounting structure, wherein the cylinder guard is attached to the hydraulic cylinder by a bolt fastened to the bolt hole. The cylinder guard mounting structure according to claim 1, wherein the protruding portion is disposed obliquely upward with respect to the airframe. As the hydraulic port, a head side hydraulic port and a rod side hydraulic port are provided,
The protrusion for the head-side hydraulic port is inclined to either the left or right of the hydraulic cylinder,
The cylinder guard mounting structure according to claim 2, wherein the protruding portion for the rod-side hydraulic port is inclined to the left or right of the hydraulic cylinder.

Images