JP6071585B2 - Tilting device for dump vehicle and dump vehicle using the same - Google Patents

Description

  The present invention relates to a tilting device for a dump vehicle and a dump vehicle using the same.

  Conventionally, as a tilting device (dump mechanism) of a dump vehicle, for example, as described in Non-Patent Document 1, in addition to a direct push type in which a lower part of a cargo box (vessel) is directly pushed by a hydraulic cylinder, a garwood type, a hail type, or a malel Link formulas such as formulas are known. Among them, the Marel type is used in large vehicles, and it is the current mainstream.

  4 is a plan view of a conventional Marel tilting device, and FIG. 5 is a side view. The tilting device shown in FIGS. 4 and 5 tilts the packing box 50 by rotating a lift arm 51 rotatably provided at the lower part of the packing box 50 by a tension link 52 and a dump cylinder 53. It is. The dump cylinder 53 is operated by hydraulic oil supplied and discharged from the hydraulic pump 54 through the flexible high-pressure hose 55 and low-pressure hose 56, respectively.

GP Planning Center, Special Vehicles and Truck Bodywork, First Edition, Grand Prix Publishing, Inc., March 13, 2000, page p. 100-103

  In the conventional tilting device, as shown in FIG. 5, a part of the high-pressure hose 55 is disposed in the main frame 57 and the bending radius is small, so that the life is short. Further, since both ends of the low-pressure hose 56 are attached between the tension link 52 and the dump cylinder 53, there is a risk that the low-pressure hose 56 may be damaged by interference with the tension link 52 and the dump cylinder 53 when the tilting device is operated.

  Therefore, in the present invention, a bending device for a dump vehicle capable of increasing the bending radius of a flexible hose and preventing damage from interference with a tension link or a dump cylinder during operation, and the same An object of the present invention is to provide a dump vehicle using the vehicle.

  A tilting device for a dump vehicle according to the present invention includes a dump cylinder that is rotatably disposed between a chassis frame of the dump vehicle and a load box that is tiltable with respect to the chassis frame, and hydraulic oil that operates the dump cylinder. It has a hydraulic pump to be supplied and a high-pressure oil passage and a low-pressure oil passage for supplying and discharging hydraulic oil to and from the dump cylinder. Each of the high-pressure oil passage and the low-pressure oil passage is provided with a flexible hose. The first end portion is disposed in the vicinity of the rotating shaft portion of the dump cylinder, and the second end portion is disposed on the outer peripheral surface of the barrel of the dump cylinder.

  According to the tilting device of the dump vehicle of the present invention, the flexible hose is always on the outer peripheral surface of the barrel of the dump cylinder from the vicinity of the rotating shaft of the dump cylinder regardless of the position of the dump cylinder. Interference with the dump cylinder and surrounding equipment can be prevented. Further, since the flexible hose is disposed on the barrel outer peripheral surface of the dump cylinder from the vicinity of the rotation axis of the dump cylinder, the bending radius of the hose can be increased.

  The tilting device for a dump vehicle according to the present invention includes a lift arm having one end pivotally supported at the lower part of the cargo box, and one end pivotally pivotally supported by the chassis frame and the other end being a lift arm. The dump cylinder has a tension link pivotally supported at the other end opposite to the cargo box, and one end of the dump cylinder is pivotally supported in the middle of the lift arm and the other end is a chassis. The flexible hose is pivotally supported at the front position of the dump vehicle relative to the position of the shaft link portion of the tension link of the frame, and each of the flexible hoses has a first end portion below the tension link, and When viewed in plan, it is desirable that the tension link shaft support portion is disposed at a front position or a rear position.

  As a result, regardless of the position of the tension link, the flexible hose is always located below the tension link and in front of or behind the tension link shaft support in plan view. Sometimes it can prevent interference with the tension link and dump cylinder.

  According to the present invention, since the flexible hose is always on the barrel outer peripheral surface of the dump cylinder from the vicinity of the rotation axis of the dump cylinder, it can be prevented from interfering with the tension link and surrounding devices when the tilting device is operated, Damage can be prevented. Moreover, since it becomes possible to make the bending radius of a hose large, a hose lifetime can be lengthened.

It is a perspective view of a dump vehicle in an embodiment of the invention. It is a top view of the tilting apparatus of the dump vehicle of FIG. It is a side view of the tilting device of the dump vehicle of FIG. It is a top view of the conventional Marel type tilting device. It is a side view of the conventional Marel type tilting device.

  1 is a perspective view of a dump vehicle according to an embodiment of the present invention, FIG. 2 is a plan view of the tilting device for the dump vehicle of FIG. 1, and FIG. 3 is a side view.

  As shown in FIG. 1, a dump vehicle 1 according to an embodiment of the present invention is equipped with a load box 4 that can tilt with respect to a chassis frame 2. The chassis frame 2 is provided on a main frame 3 with subframes 3a and 3b extending in the front-rear direction of the dump vehicle 1 on the left and right sides of the vehicle body, and a cross member 3c that connects the subframes 3a and 3b at a predetermined position. It is what was done. Hinge brackets 4a are provided on the left and right of the rear portion of the packing box 4, and the hinge bracket 4a is rotatably connected to the rear portions of the subframes 3a and 3b by a hinge shaft 4b. The cargo box 4 can be tilted about the hinge shaft 4b with the hinge shaft 4b as a tilting shaft.

  Further, as shown in FIGS. 2 and 3, the tilting device 5 of the dump vehicle 1 includes a pair of left and right lift arms 6a and 6b, one end of which is pivotally supported at the lower portion of the cargo box 4, and a chassis. A pair of left and right tension links 7a, 7b rotatably disposed between the frame 2 and the lift arms 6a, 6b, and a pivot frame disposed between the chassis frame 2 and the cargo box 4. A dump cylinder 8, a hydraulic pump 9 that supplies hydraulic oil that operates the dump cylinder 8, and a high-pressure oil passage 10 a and a low-pressure oil passage 10 b that supply and discharge hydraulic oil to and from the dump cylinder 8 are provided. In FIG. 3, the subframe 3a, the lift arm 6a, and the tension link 7a are omitted.

  One end of each of the lift arms 6 a and 6 b is pivotally supported by a pin 12 on a cross member 11 below the cargo box 4. The tension links 7a, 7b are pivotally supported by the subframes 3a, 3b at one end by a pin 14 and the other end by a pin 13 at the other end of the lift arms 6a, 6b opposite to the cargo box 4. The shaft is pivotally supported.

  One end of the dump cylinder 8 is pivotally supported in the middle part of the lift arms 6a and 6b, and the other end is positioned forward of the dump vehicle 1 with respect to the position of the shaft support part of the tension links 7a and 7b of the chassis frame 2. It is pivotally supported. More specifically, in the dump cylinder 8, the base end of the barrel (cylinder barrel) 8a is pivotally supported on the subframes 3a and 3b by the shaft 16, and the tip of the cylinder rod 8b is in the middle of the lift arms 6a and 6b. The shaft is pivotally supported by the cross head 15 at the portion.

  The hydraulic pump 9 is driven by a traveling engine (not shown) of the dump vehicle 1 via a PTO (power take-off device) and a drive shaft (not shown).

  One end of the high-pressure oil passage 10a is connected to the hydraulic pump 9, and the first high-pressure oil passage 10a is disposed from the rear side of the dump vehicle 1 of the tension link 7a to the front side via the lower side of the pin 14 of the tension link 7a. One end of the pipe 20 is connected to the first pipe 20 by a joint 21a, and the high pressure is provided at a position below the tension link 7a and at a position in front of the pin 14 that is a shaft support portion of the tension link 7a when viewed in plan. Side flexible hose 21, one end of which is connected to the hose 21 by a joint 21 b at a position below the tension link 7 a, and the other end is connected to the base end of the cylinder barrel 8 a of the dump cylinder 8. 2 pipes 22.

  The low-pressure oil passage 10b is connected to the hydraulic pump 9 at one end, and is arranged on the low-pressure side disposed from the rear side of the dump vehicle 1 of the tension link 7b to the front side via the pin 14 of the tension link 7b. One end of the first pipe 23 is connected to the first pipe 23 by a joint 24a, and is disposed at a position below the tension link 7b and at a position in front of the pin 14 that is a shaft support portion of the tension link 7a when viewed in plan. The low pressure side flexible hose 24, one end of which is connected to the hose 24 by a joint 24b below the tension link 7b, and the other end is connected to the tip of the cylinder barrel 8a of the dump cylinder 8 And a second pipe 25.

  That is, in the high-pressure oil passage 10a and the low-pressure oil passage 10b in the present embodiment, flexible hoses 21 and 24 are interposed, respectively, and the joints 21a and 24a, which are the first ends thereof, rotate the dump cylinder 8. The joints 21b and 24b, which are the second end portions, are disposed on the outer peripheral surface of the cylinder barrel 8a while being disposed in the vicinity of the shaft 16 that is the shaft portion. In addition, since the hose 24 and the joint 24b are arrange | positioned in the position which overlaps with the hose 21 and the joint 21b of the high voltage | pressure side in FIG. 3, they do not appear in FIG. A reservoir tank 26 is provided in the middle of the first pipe 23 on the low pressure side.

  In the tilting device 5 configured as described above, hydraulic oil is supplied to the base end portion of the cylinder barrel 8 a of the dump cylinder 8 through the first pipe 20, the hose 21, and the second pipe 22 on the high pressure side from the hydraulic pump 9 during the dumping operation of the cargo box 4. The hydraulic oil is discharged from the tip of the cylinder barrel 8a through the second pipe 25, the hose 24, and the first pipe 23 on the low pressure side. As a result, the cylinder rod 8b is extended, the dump cylinder 8, the tension links 7a and 7b and the lift arms 6a and 6b are rotated, and the cargo box 4 is tilted as shown in the two-dot chain line in FIG. 3 and FIG. .

  On the other hand, when returning the packing box 4 to the normal position, if the high pressure side and the low pressure side of the hydraulic pump 9 are communicated, the hydraulic oil in the cylinder barrel 8a is discharged by the dead weight of the packing box 4, and the cylinder rod 8b The dump cylinder 8, the tension links 7a and 7b, and the lift arms 6a and 6b rotate, and the packing box 4 returns to the normal position indicated by the solid line in FIG.

  During the operation of the tilting device 5, the hoses 21, 24 are always positioned below the tension links 7 a, 7 b regardless of the positions of the tension links 7 a, 7 b. Since the shaft 14 is located in front of the pin 14, it does not interfere with the tension links 7 a and 7 b and the dump cylinder 8, and damage can be prevented. Further, in the high pressure oil passage 10a and the low pressure oil passage 10b, the connection portion of the hydraulic pump 9 and the connection portion of the cylinder barrel 8a of the dump cylinder 8 are reduced in the bending radius, and the first pipes 20 and 23 and the second pipes 22 and 25 are connected. Since the hoses 21 and 24 connect the first pipes 20 and 23 and the second pipes 22 and 25, it is possible to increase the bending radius of the hoses 21 and 24. And hose life can be extended.

  In the present embodiment, the joints 21a and 24a, which are the first ends of the hoses 21 and 24, are positioned below the tension links 7a and 7b, and the tension links 7a and 7b when viewed in plan. Although an example in which the pin 14 that is the shaft support portion is disposed at the front position of the pin 14 has been described, the joints 21 a and 24 a may be disposed at the rear position of the pin 14. If the joints 21a and 24a are in the vicinity of the shaft 16 that is the rotation shaft of the dump cylinder 8, and the joints 21b and 24b that are the second end are disposed on the outer peripheral surface of the cylinder barrel 8a, Interference with the dump cylinder 8 and surrounding equipment can be prevented.

  INDUSTRIAL APPLICABILITY The present invention is useful as a tilting device that tilts a cargo box of a dump vehicle and a dump vehicle using the tilting device.

DESCRIPTION OF SYMBOLS 1 Dump vehicle 2 Chassis frame 3 Main frame 3a, 3b Sub frame 3c Cross member 4 Cargo box 5 Tilt device 6a, 6b Lift arm 7a, 7b Tension link 8 Dump cylinder 8a Cylinder barrel 8b Cylinder rod 9 Hydraulic pump 10a High pressure oil path 10b Low pressure oil passage 11 Cross member 12, 13, 14 Pin 15 Cross head 16 Shaft 20 High pressure side first pipe 21 High pressure side flexible hose 21a, 21b Joint 22 High pressure side second pipe 23 Low pressure side first pipe Piping 24 Flexible hose 24a, 24b on low pressure side Fitting 25 Second piping on low pressure side 26 Reservoir tank

Claims (3)

A lift arm whose one end is pivotally supported at the lower part of a load box tiltable with respect to the chassis frame of the dump vehicle;
A tension link pivotally supported at one end on the chassis frame and pivotally supported at the other end of the lift arm opposite to the cargo box;
Wherein is rotatably disposed between the chassis frame and the previous yn box, one end pivotably journaled on the middle portion of the lift arm, the shaft support of the other end the tension link of the chassis frame The cylinder rod is extended to tilt the packing box during the dumping operation, and the cylinder rod is retracted to return the packing box to the normal position. A dump cylinder,
A hydraulic pump for supplying hydraulic oil for operating the dump cylinder;
A high-pressure oil passage and a low-pressure oil passage for supplying and discharging the hydraulic oil to and from the dump cylinder;
The high-pressure oil passage and the low-pressure oil passage are each provided with a flexible hose, and the first end of the hose is the dump when the cylinder rod is retracted and the packing box is in the normal position. Arranged on the upper side in the vicinity of the rotating shaft portion of the cylinder, and the second end portion is disposed below the outer peripheral surface of the barrel of the dump cylinder when the cylinder rod is retracted and the cargo box is in the normal position. A tilting device for a dump vehicle, characterized in that Those hose before Symbol flexible, each said first end portion, the lower position of the tension link, and which is disposed in the forward position or backward position of the shaft support of the tension link when viewed from 2. The tilting device for a dump vehicle according to claim 1, wherein the tilting device is a dump vehicle. Dump vehicle comprising the tilting device dump vehicle according to claim 1 or 2.

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