JPH0318472Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an oil supply device for a hydraulic jack in an outrigger device installed in a work vehicle such as a crane vehicle or an aerial work vehicle.

(Prior Art) As a conventional oil feeding device for a hydraulic jack in an outrigger device, the device shown in FIGS. 1 and 2 is known.

That is, FIG. 1 shows the outrigger device in its contracted state, and FIG. 2 shows the outrigger device in its extended state. In FIGS. 1 and 2, the outrigger device 1 connects a middle cylinder 4 to an outer cylinder 3 horizontally fixed to a vehicle 2, and an inner cylinder 6 to which a hydraulic jacking device 18 is vertically fixed at the tip of the middle cylinder 4. It is inserted in a flexible manner. The hydraulic jack device 18 includes:
It consists of a hydraulic jack 5 consisting of a hydraulic cylinder and a floor plate 19 provided at the rod end of the hydraulic cylinder. A hydraulic jack 5 consisting of a hydraulic cylinder is provided with a supply/discharge port 16 for supplying and discharging water to and from the hydraulic cylinder. In the outrigger device 1, a hydraulic cylinder 7 is arranged between the outer cylinder 3 and the middle cylinder 4, and a hydraulic cylinder 8 is arranged between the middle cylinder 4 and the inner cylinder 6. By driving these hydraulic cylinders 7 and 8 to extend and contract, the outer cylinder is The middle cylinder 4 can be expanded and contracted from the cylinder 3, and the inner cylinder 6 can be expanded and contracted from the middle cylinder 4. In order to operate the hydraulic jack 5, an oil feeding device is provided in the middle cylinder 4 and inner cylinder 6, which are expanded and contracted in this way, as follows. A joint 9 is fixed to the cylinder end on the rod drawer side of the hydraulic cylinder 8, and a joint 10 is fixed to the cylinder end on the hip side.
They are hydraulically connected by 1. There is a joint 12 at the cylinder end on the rod drawer side of the hydraulic cylinder 7.
The joint 10 is hydraulically connected to the joint 10 by a hose 13. In addition, in the contracted state of the middle cylinder 4 and the inner cylinder 6, one end thereof is connected to the joint 12 separately from the connection of the hose 13,
From there, it reaches the outside of the inner cylinder 6, where it is turned around and guided inside the outer cylinder 3 through the inner cylinder 6, middle cylinder 4, and outer cylinder 3, and is fixed there and hydraulically applied from the outside. A hose 14 is provided, the other end of which is connected to a hydraulic pressure supply/discharge port 15 for supplying and discharging water.

Furthermore, one end of the joint 9 is connected to the pipe 11 separately from the connection with the pipe 11, and from there it reaches the inside of the inner cylinder 6, where it is turned around and guided to the outside of the inner cylinder 6, and the above-mentioned supply/discharge Hose 1 with the other end connected to port 16
There are 7.

(Problems to be Solved by the Present Invention) However, in the oil supply device to the hydraulic jack in the outrigger device configured as described above,
When the inner cylinder 6 expands and contracts with respect to the middle cylinder 4, the inverted folded portion of the hose 14 comes in and out from the base end of the inner cylinder 6.
Especially when the inner cylinder 6 is reduced relative to the middle cylinder 4, the hose 14
There was a problem that the hose was bent irregularly by the base end of the inner cylinder 6 (see FIG. 4) or damaged, shortening the life of the hose.

Furthermore, since the hoses 14 and 17 are reversely folded in opposite directions, when the middle cylinder 4 with respect to the outer cylinder 3 and the inner cylinder 6 with respect to the middle cylinder 4 are most contracted, the reversely folded portions of these hoses 4 and 6 To prevent the hoses 14 and 17 from interfering with each other, the hoses 14 and 17 are separated from each other in the width direction of the inner cylinder 6. It was necessary to arrange it (see Figure 3). However, such an arrangement has a problem in that it is difficult in terms of space for outrigger devices such as small cranes in which the width of the inner cylinder 6 is small.

The object of the present invention is to provide a novel oil supply device for a hydraulic jack in an outrigger device that solves these problems.

(Means for solving the problem) In order to achieve this purpose, the oil supply device for the hydraulic jack in the outrigger device of the present invention is designed to connect the middle cylinder to the outer cylinder fixed horizontally on the vehicle, and the oil to the inside of the middle cylinder. An oil supply device for a hydraulic jack in a vehicle outrigger device, which is formed by telescopically inserting inner cylinders each having a hydraulic jack device vertically fixed at the tip thereof,
The outer cylinder has a fitting portion for telescopically fitting the middle cylinder at its outer end portion, and a space is formed above the upper surface of the middle cylinder, the portion inward of the fitting portion being in a contracted state. The middle cylinder and A relay rod is provided along the inside of the inner cylinder, and one end is fixed to the space near the outer end of the outer cylinder, and from there, the rod passes through the space to the inside of the outer cylinder, where it is inverted and folded. After passing through the middle cylinder and the inside of the inner cylinder, it is guided toward the tip of the inner cylinder, and then passes through the hose relay device and reaches the inside of the inner cylinder, where it is turned around and returned to the inside of the inner cylinder. It is characterized by comprising a hose which is guided through the inner cylinder to a hydraulic jack at the tip of the inner cylinder and whose other end is connected to the hydraulic jack.

(Function) The oil supply device for the hydraulic jack in the outrigger device of the present invention having the above-described configuration is such that the inverted folded portion of the hose, which corresponds to the hose 14 in the prior art, is in any extended state of the middle cylinder or the inner cylinder. Since it is always located on the outside of the middle cylinder and inner cylinder, the inverted folded part of the hose will not come in or out from the inner cylinder or the base end of the middle cylinder when the inner cylinder expands and contracts with respect to the middle cylinder or the middle cylinder with respect to the outer cylinder. , the hose will not be bent irregularly or damaged by the inner or inner tube. Furthermore, since the hoses are inverted and folded in the same direction and their inverted and folded portions do not overlap each other, there is no need to arrange the hoses apart in the width direction of the inner cylinder. It is.

(Embodiment) Next, an embodiment of the oil supply device for the hydraulic jack in the outrigger device of the present invention will be described with reference to FIG. 5 and subsequent figures.

In FIG. 5, reference numeral 20 denotes an outrigger device that connects the inner cylinder 2 to the outer cylinder 22 horizontally fixed to the vehicle 21.
3 and an inner cylinder 25 having a hydraulic jacking device 24 suspended and fixed at its tip are telescopically inserted into the middle cylinder 23, and FIG. 5 shows the outrigger device 20 in a contracted state. The hydraulic jack device 24 consists of a hydraulic jack 41 consisting of a hydraulic cylinder and a floor plate 42 provided at the rod end of the hydraulic cylinder. Reference numeral 40 denotes a supply/discharge port which is fixed to the top of the hydraulic jack 41 consisting of a hydraulic cylinder and supplies and discharges pressure oil to the hydraulic cylinder. The outer cylinder 22
has a fitting part 26 that telescopically fits the middle cylinder 23 in its outer end portion, and the fitting part 2
The inner portion of the inner tube 6 is provided with a space 27 above the upper surface of the middle tube 23 in the contracted state. 33 is
This hose relay device has two sets of communicating passages inside thereof, and threaded portions for connecting hose caps are provided at the ends of each of the communicating passages, and each threaded portion is provided at one end thereof.
This hose relay fitting 33 has an inner tube 25 than a middle tube 23.
A roller 34 is provided that slides on the inner lower surface of the inner cylinder 25 when the inner cylinder 25 is expanded and contracted. 28 is
A bracket 3 which is a relay rod and has one end formed of a threaded portion 29 fixed to the base end portion of the middle tube 23;
It is inserted into a hole provided at 0 and fixed with nuts 31 and 32. The other end of the relay rod 28 is connected to the hose relay fitting 3 located near the tip of the cylinder 25 in the contracted state.
It is connected to 3. Reference numeral 35 denotes a first hose section, which consists of a joint 36 and a hose 37. The joint 36 is fixed to the space 27 near the outer end of the outer cylinder 22, and has one end connected to an external hydraulic pressure supply source (not shown), and the other end connected to a screw cap of a hose. It consists of parts. The hose 37 has a cap at one end connected to the threaded part of the joint 36, passes through the space 27, reaches the inside of the outer cylinder 22, is turned around, and then is connected to the middle cylinder 23 and the inner cylinder. 25 and is guided toward the distal end of the inner cylinder 25, and the other end of the fitting is connected to a threaded portion provided on the hose relay fitting 33. Reference numeral 38 denotes a hose guide provided at the base end of the middle tube 23 so that the inverted folded portion of the hose 37 can be smoothly bent. The supply/discharge port 40 has a supply/discharge port for the hydraulic jack 41 at one end thereof, and has a threaded portion connected to the mouthpiece of the hose. 39 is
The second hose section has a cap at one end connected to the threaded part of the hose relay fitting 33, reaches the inside of the inner cylinder 25, is turned around, and then passes inside the inner cylinder 25 again. It consists of a hose that passes through the inner cylinder 25 and is guided to a hydraulic jack 41 at the tip of the inner cylinder 25, and the other end is connected to the threaded portion of the supply/discharge port 40.
Note that the first hose section 35 and the second hose section 39 are connected to each other by a communication passage provided in the hose relay device 33, and the first hose section 35 and the hose relay are connected to each other from an external hydraulic power source. The oil is sent to the hydraulic jack 41 through the tool 33, the second hose section 39, and the supply/discharge port 40. Although only one circuit of the oil passage is shown in the drawing, the oil passage is composed of oil passages from two circuits, forming an oil transmission and a return circuit.

Next, the effect will be explained.

FIG. 6 is an explanatory diagram showing a state in which the middle cylinder 23 is extended from the outer cylinder 22. As shown in Figure 6,
As the middle tube 23 extends from the outer tube 22, the hose relay tool 33 connects to the relay rod 2 fixed to the base end of the middle tube 23.
8, it moves outward while remaining on the inner lower surface of the inner cylinder 25. As the hose relay device 33 moves, one end of the hose 37 connected to the hose relay device 33 also moves outward. Therefore, since the other end of the hose 37 is fixed by the joint 36, the inverted and folded portions of the hose 37 sequentially move outward. At this time, the inverted and folded portion of the hose 37 does not come out from the base end portions of the middle tube 23 and the inner tube 25. Next, from the state shown in Fig. 6, the middle cylinder 23
When the inner cylinder 25 is further extended, it is as shown in FIG. That is, as the inner cylinder 25 extends from the middle cylinder 23, the hose relay fitting 33, which connects one end of the hose of the second hose section 39, is fixed to the base end of the middle cylinder 23 by the relay rod 28. The inner cylinder 25 does not move and only the inner cylinder 25 extends. At this time, the hose relay fitting 33 connected to one end of the hose of the second hose section 39 slides on the inner lower surface of the inner cylinder 25 via the roller 34, and is positioned at the base end of the inner cylinder 25. Become. On the other hand, the other end of the hose of the second hose section 39 connected to the supply/discharge port 40 provided at the top of the hydraulic jack 41 moves outward as the inner cylinder 25 expands. Accordingly, the inverted and folded portion of the second hose section 39 also sequentially moves outward. At this time, the second hose section 3
The inverted and folded portion of the hose 9 only moves within the inner cylinder 25. Conversely, the inner cylinder 25 and the middle cylinder 2
3 is stored, the effect is opposite to the above. In this way, oil can be supplied to the hydraulic jack 24 when the outrigger device 20 is extended and contracted.

Next, when the outrigger device 20 is in the contracted state, the first hose section and the second hose section are turned around in the same direction as shown in FIG. I'm trying to position it. Further, even in FIGS. 6 and 7 in which the outrigger device 20 is extended, this relationship is maintained and there is no mutual overlap. That is, when the hose sections were reversed and folded back to each other as in the conventional embodiment, it was necessary to arrange each hose section at a distance on both sides of the hydraulic cylinder (as shown in FIG. 3). By configuring as described above, it is only necessary to arrange it on one side of the hydraulic cylinder. Therefore, it can also be used in narrow outrigger devices.

In the above embodiment, the first hose section 35
One end of the hose 37 is connected to the hose relay fitting 33, but the relay rod 28 is made of pipe material.
One end of the hose 37 may be connected to the attachment point of the hose 37, and the oil may be supplied by connecting it to the relay fitting 33 via a relay rod made of a pipe material.

In addition, in the description of the above embodiment, from the outer cylinder 22 to the middle cylinder 2
3 is extended, and then the inner cylinder 25 is extended from the middle cylinder 23.
3 and the inner cylinder 25 can be extended in the same manner.

Further, in the above embodiment, the extension and contraction means of the outrigger device 20 were not described, but the first
As shown in the figure, a hydraulic cylinder may be used, or in the case of a small outrigger device, it may be carried out manually.

(Effects of the invention) Since the present invention is constructed and operates as described above, the inverted folded portion of the hoe is able to move the proximal end of the inner cylinder or the middle cylinder when the inner cylinder expands and contracts with respect to the inner cylinder or the outer cylinder. The life of the oil feeding device can be increased because it will not come in or out of the oil supply section, and will not be irregularly bent or damaged by the middle cylinder or inner cylinder. Furthermore, since the hoses are inverted and folded in the same direction and their inverted and folded parts do not overlap with each other, there is no need to arrange the hoses in the inner cylinder at a distance in the width direction of the inner cylinder. be. Therefore, the present invention can also be applied to an outrigger device with a small inner cylinder width used in a small crane or the like.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a state in which the outrigger device is contracted with an oil supply device to a hydraulic jack in a conventional outrigger device, and Fig. 2 is an explanatory diagram showing a state in which the outrigger device is extended from the state in Fig. 1. ,
3 is a sectional view taken along the line A-A in FIG. 1, FIG. 4 is an explanatory diagram showing a state in which the outrigger device is being extended from the state shown in FIG. 1, and FIG. 5 is an illustration of the outrigger device of the present invention. An explanatory diagram showing the state in which the outrigger device is contracted in the oil supply device to the hydraulic jack, FIG. 6 is an explanatory diagram showing the state in which the middle cylinder is extended from the state in FIG. 5, and FIG. It is an explanatory view showing a state where the inner cylinder is extended from the state. 21... Vehicle, 22... Outer cylinder, 23... Middle cylinder,
24...Hydraulic jacking device, 25...Inner cylinder, 41
... Hydraulic jack, 20 ... Outrigger device, 2
6... Fitting part, 27... Space part, 33... Hose relay tool, 28... Relay rod, 35... First hose section, 39... Second hose section.

Claims (1)

[Scope of utility model registration request] Oil supply to a hydraulic jack in a vehicle outrigger device, in which a middle cylinder is telescopically inserted into an outer cylinder horizontally fixed to the vehicle, and an inner cylinder with a hydraulic jack device vertically fixed to the end of the middle cylinder is telescopically inserted into the middle cylinder. It is a device,
The outer cylinder has a fitting portion for telescopically fitting the middle cylinder at its outer end portion, and a space is formed above the upper side of the middle cylinder, the portion inward of the fitting portion being in a contracted state. The middle cylinder and A relay rod is provided along the inside of the inner cylinder, and one end is fixed to the space near the outer end portion of the outer cylinder, passes through the space to the inside of the outer cylinder, and is turned back and forth. After passing through the middle cylinder and the inside of the inner cylinder, it is guided toward the tip of the inner cylinder, and then passes through the hose relay device and reaches the inside of the inner cylinder, where it is turned around and returned to the inside of the inner cylinder. An oil supply device for a hydraulic jack in an outrigger device, comprising a hose that is guided through the inner cylinder to a hydraulic jack at the tip of an inner cylinder and connected to the hydraulic jack at the other end.