JP3062058B2 - Hydraulic piping system for three-stage mast type forklift - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hydraulic piping system for a three-stage mast type forklift, and more particularly to a hydraulic piping for a front attachment of a forklift having a three-stage mast.

[0002]

2. Description of the Related Art FIG. 8 is a front view of a conventional three-stage mast type forklift provided with a hydraulic pipe for a front attachment, and FIG. 9 is a side sectional view of the same. A pair of middle masts 3, 3 are supported inside the pair of left and right outer masts 2, 2 mounted on the front part of the vehicle body 1 so as to be vertically movable, and a pair of inner masts 4, 4 are vertically movable inside the pair. Supported. A carriage 5 for mounting various attachments is supported on the inner masts 4 and 4 so as to be vertically movable. Behind the mast, a pair of lift cylinders 6, 6 for connecting the lower parts of the outer masts 2, 2 and the upper parts of the middle masts 3, 3 are arranged. Inner mast 4,
Chain sheaves 50, 50 are mounted on the middle masts 3, 3 at the upper and lower positions of the middle masts 3, 4, respectively, in the vertical direction (along the longitudinal axis of the vehicle). Chains 51, 51 are respectively wound around the chain sheaves 50, 50, and one ends thereof are connected to brackets 52, 52 fixed to the outer masts 2, 2, respectively.
The other end is connected to the lower part of the inner masts 4,4. Therefore, when the lift cylinders 6, 6 are extended, the middle masts 3, 3 rise along the outer masts 2, 2, and at the same time, the inner masts 4, 4 are also pulled by the chains 51, 51 and rise along the middle masts 3, 3. .

A center cylinder 10 is mounted upright at the center and lower portion of the inner masts 4, 4.
Chain sheaves 12, 12 are provided on the front end and on both sides of 1. Chain sheaves 12 and 12 have a chain 1
3 and 13 are wound around, one end of which is inner mast 4,
4 and the other end is connected to the carriage 5.
Therefore, when the center cylinder 10 is extended, the carriage 5 is pulled by the chains 13 and rises along the inner masts 4 and 4.

The hydraulic pipes for various attachments to be mounted on the carriage 5 differ depending on the attachment to be mounted. In this embodiment, four hydraulic pipes are shown. On one side (the right side in the drawing) of the chain sheaves 50, 50 attached to the middle masts 3, 3, a double hose pulley 60 of an attachment hydraulic pipe is mounted, and the other side of the chain sheaves 50, 50 is mounted. A hose pulley 53 of a rubber hose 54 for the center cylinder 10 and a double hose pulley 61 of a hydraulic pipe for attachment are mounted inside (on the left side in the figure). One end of each of the rubber hoses 62 and 62 is connected to two of four pipes 55 (right side in the drawing) connected to a hydraulic device (not shown) provided in the vehicle body 1 via a pipe 56 and a hose pulley. After being wound around 60, it is guided to the lower part of the inner masts 4, 4, and the other end is connected to a hydraulic pipe for attachment attached to the inner masts 4, 4 not shown. The other two rubber hoses 63, 63 have four pipes 55 (one on the left side in the figure) connected at one end to a hydraulic device (not shown) arranged on the vehicle body 1 side.
And two of them are connected via a pipe 56,
After being wound around the hose pulley 61, it is guided to the lower part of the inner masts 4, 4, and the other end is connected to a hydraulic piping for attachment attached to the inner masts 4, 4.

The piston rod 11 of the center cylinder 10
Hose pulleys 64, 64 are respectively disposed outside the chain sheaves 12, 12 provided on the front end and on both sides of the rubber hoses.
5 and 65 are wound around the pipes 68 and 6 of the carriage 5.
8 is connected. A double hose pulley 66 is mounted on the upper end of the piston rod 11, and rubber hoses 67, 67 connected to the rubber hoses 63, 63 are wound around and connected to the pipes 69, 69 of the carriage 5. The pipes 68 and 69 are connected to hydraulic equipment of various attachments mounted on the carriage 5.

[0006]

However, in the above configuration, as shown in FIG.
The hose pulley 53, the hose pulley 53 and the hose pulley 61 are located inside the inner masts 4, 4, so that the rubber hoses 62, 54 and 63 are also located inside the inner masts 4, 4. Further, the hose pulley 64 is located on both outer sides of the center cylinder 10, and accordingly, the rubber hose 65 is also located on both outer sides of the center cylinder 10. Therefore, there is a problem that the forward view of the operator is only the S section indicated by hatching, which is narrow, the forward view is poor, and it is difficult to steer. Also, because rubber hoses are long,
There is a problem that it is easily damaged by fluttering or the like.

The present invention has been made in view of the above problems, and relates to a hydraulic piping system for a three-stage mast type forklift. In particular, the present invention has good forward visibility, is easy to operate, and is free from damage caused by flapping of a rubber hose. It is an object of the present invention to provide a three-stage mast piping structure of a forklift with a low possibility.

[0008]

According to a first aspect of the present invention, there is provided a hydraulic piping system for a three-stage mast type forklift, comprising a pair of left and right outer masts mounted on a front portion of a vehicle body. A pair of left and right middle masts supported vertically inside the outer mast, a pair of left and right inner masts supported vertically inside the middle mast, and various types vertically supported by the inner masts. A carriage that mounts attachments, a center cylinder that is mounted upright on the inner mast and vertically moves the carriage up and down, and hydraulic oil from hydraulic equipment attached to the vehicle body can be supplied to hydraulic cylinders that drive various attachments In a hydraulic piping system of a three-stage mast type forklift having a flexible tube, the tip of a piston rod of the center cylinder may be used. And, or two hose pulley as four flexible tube is within the width of the center cylinder in front and rear of the center cylinder, in parallel to the coaxial,
The two hose pulleys are independently supported by bearings, and a flexible tube to be connected to the hose pulley is composed of two rubber hoses. It is a characterized twin hose.

In the second invention, a pair of left and right outer masts mounted on the front portion of the vehicle body, a pair of left and right middle masts supported vertically inside the outer masts, and vertically movable inside the middle masts A pair of left and right inner masts supported on the inner mast, a carriage for mounting various attachments supported on the inner mast, a center cylinder mounted upright on the inner mast and vertically moving the carriage up and down, and In a hydraulic piping device of a three-stage mast type forklift having a flexible tube for supplying hydraulic oil to hydraulic cylinders for driving various attachments from an attached hydraulic device, a hose pulley is provided on a rear surface of an upper end of the middle mast, Four connecting hydraulic equipment of the body and hydraulic equipment of various attachments attached to the carriage At least two flexible tubes among the flexible tubes are wound around the hose pulley and disposed so as to overlap behind the mast, and the flexible tube applied to the hose pulley integrally includes two rubber hoses. It is characterized by being a twin hose configured.

[0010]

As described above, since the flexible tube is placed within the width of the center cylinder, the number of flexible tubes disposed inside the inner mast and between the inner mast and the center cylinder is reduced, and the space is reduced. And a good front view can be secured. In addition, since the flexible tube is disposed so as to overlap the rear of the mast, when the carriage is raised, the number of pipes in front is reduced, and similarly, a good front view can be secured. In addition, since the twin hose is used, the width of the hose pulley can be reduced, so that four flexible tubes can be put in the width of the center cylinder. Since the hose pulleys are separately supported separately, there is no slippage between the flexible tube and the hose pulley. Further, the use of a twin hose reduces fluttering and twisting.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydraulic piping device for a three-stage mast type forklift according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing a state where the three-stage mast is reduced and the carriage is lowered. A pair of middle masts 3, 3 are supported inside the pair of left and right outer masts 2, 2 mounted on the front part of the vehicle body 1 so as to be vertically movable, and a pair of inner masts 4, 4 are vertically movable inside the pair. It is supported by. A carriage 5 on which various attachments are mounted is supported by the inner masts 4 and 4 so as to be vertically movable. Lift cylinders 6, 6 are arranged behind the middle masts 3, 3, and connect the lower parts of the outer masts 2, 2 and the upper parts of the middle masts 3, 3. Chain sheaves 7, 7 are mounted on the upper and rear surfaces of the middle masts 3, 3, respectively, in a horizontal direction (in a direction perpendicular to the longitudinal axis of the vehicle). Chains 8, 8 are wound around the chain sheaves 7, one end of which is connected to the outer masts 2, 2, and the other end is connected to the lower part of the inner masts 4, 4. Therefore, when the lift cylinders 6, 6 are extended, the middle masts 3, 3 rise along the outer masts 2, 2, and at the same time, the inner masts 4, 4 are also pulled by the chains 8, 8 and rise along the middle masts 3, 3. .

A center cylinder 10 is mounted upright on the lower parts of the inner masts 4, and chain sheaves 12 are mounted on both left and right sides of an upper part of the piston rod 11. The chain sheave 12, 12 has a chain 13,
13 is wound around, one end of which is inner mast 4, 4
, And the other end is connected to the carriage 5. Therefore, when the center cylinder 10 is extended, the carriage 5 is pulled by the chains 13 and rises along the inner masts 4 and 4.

On the upper end side of the piston lot 11,
As shown in FIG. 2, the bracket 15 is
It is attached to 1. FIG. 2 shows a first embodiment of the hose pulley section 40, and shows a cross-sectional view taken along the line AA of FIG. 6 described later, and shows a cross section of a hose pulley for a twin rubber hose. In FIG. 2, a pin 16 is provided on the bracket 15, and the separated hose pulleys 17 a and 17 b for twin rubber hoses are attached to the pin 16 in parallel and coaxially via bearings 18. I have. The width (L) of the bracket 15 is smaller than the width of the center cylinder 10. Hose pulleys 17a, 17b for twin rubber hose
Are wound around the twin rubber hoses 35 and 36 described later. A pin 47 and a bearing 48 are provided below the twin rubber hose hose pulleys 17a and 17b.
The guide seal 49 is supported by the guide seal 49.

Four pipes are shown for the hydraulic equipment of various attachments mounted on the carriage 5 as in the conventional example. 3 to 6 are diagrams showing the piping structure, and show the piping in a state where the mast is fully extended.

FIG. 3 is a front view of a lower portion of the outer mast 2 and the middle mast 3, and FIG. 4 is a side view of the same. Body 1
The four pipes 20 connected to a hydraulic device (not shown) arranged on the side are divided into two pipes 20A and 20B on the left and right sides, and the pipe 20A is clamped to a bracket 21 attached to the outside of the outer mast 2. Connected to the pipe 22. The pipe 20B is connected to a pipe 24 which is clamped by a bracket 23 attached to the outer mast 2. The pipe 24 is arranged behind the middle masts 3,3. A twin hose 25 configured integrally with two rubber hoses is connected to a tip of the pipe 22, and a twin hose 26 similarly configured is connected to a tip of the pipe 24.

FIG. 5 is a front view of the upper part of the middle mast 3 and the inner mast 4, and FIG. 6 is a side view of the same. A hose pulley 30 is mounted laterally on the upper and rear sides of one side of the pair of middle masts 3,3. Hose pulley 3
A twin hose 25 is wound around 0, and one end is attached to the pipe 22 and the other end is attached to the inner mast 4. The hose pulley 31 is located inside the inner mast 4. A hose pulley 31 is mounted vertically above and inside the other ends of the middle masts 3,3. A twin hose 26 is wound around the hose pulley 31, one end of which is attached to the pipe 24 and the other end of which is attached to the inner mast 4. The hose pulley 31 is located inside the inner mast 4. Twin hose 2 attached to inner mast 4
Pipes 32 and 33 are connected to 5 and 26, respectively. Piping 3
2 and 33 are clamped by the clamp 34 to the inner mast 4. Twin hoses 35 and 36 are connected to the ends of the pipes 32 and 33, respectively.

The twin hoses 35 and 36 are respectively wound around twin rubber hose hose pulleys 17a and 17b at the tip of a piston rod 11 of a center cylinder 10 mounted upright on the inner mast 4. The twin hoses 35 and 36 after being wound are clamped by the clamp 38 on the carriage 5. At this time, the width of the twin hoses 35 and 36 is within the width of the center cylinder 10. One end 35 of twin hoses 35 and 36 after being clamped by clamp 38
a and 36a are connected to hydraulic equipment of various attachments mounted on the carriage 5.

FIG. 1 shows a three-stage mast provided with the hydraulic line for attachment constructed as described above. According to FIG. 1, the twin hoses 35 and 36 are arranged so as to overlap the center cylinder 10. Further, the twin hose 26 is disposed along the inside of the other side of the inner mast 4, but since the twin hose 26 is used, only one pulley is required, and since the interval between the pulleys is unnecessary, the width of the rubber hose is reduced. Is getting narrower. Accordingly, since the twin hoses 35 and 36 are placed within the width of the center cylinder 10, the number of rubber hoses disposed inside the inner masts 4, 4 and between the inner masts 4, 4 and the center cylinder 10 is reduced. The inside space is much wider than in the prior art, as shown by the hatched portion R shown in the figure, and a good front view of the operator can be secured. Further, since the pipes 24 are arranged so as to overlap behind the middle masts 3 and 3, when the carriage 5 rises, the number of pipes 24 in front is reduced, and similarly, a good front view of the operator can be secured.

Further, since the twin hoses 35 and 36 are used, the width of the hose pulleys 17a and 17b can be reduced, so that two twin hoses 35 and 36, that is, four rubber hoses are set within the width of the center cylinder 10. You can enter. Also, hose pulleys 17a, 17
Since b is separated separately and supported by the bearings 18, there is no slippage between the twin hoses 35 and 36 and the hose pulleys 17a and 17b. That is, since the hose pulleys 17a and 17b and the twin hoses 35 and 36 rotate correspondingly, the hose pulley 17b is not dragged by one of the twin hoses 35 and does not rotate and slips. In addition, the use of the twin hoses 35 and 36 causes fluttering,
Twisting is reduced and damage is less likely.

Next, FIG. 7 shows a hose pulley portion 40A of a second embodiment. In FIG. 7, a bracket 41 is attached to the piston rod 11 on the upper end side of the piston rod 11. A pin 42 and a pin 43 are arranged on the bracket 41 so as to overlap with each other at a predetermined interval in the vertical direction. Hose pulleys 44a and 44b for twin rubber hoses are respectively arranged on the pins 42 and 43 so as to be vertically separated by a predetermined distance. The hose pulleys 44a and 44b for the twin rubber hose are respectively attached to the pins 42 and 43 via the bearings 18. A cover 45 for preventing the hose from coming off is attached to the bracket 15. Bracket 1
5 is smaller than the width of the center cylinder 10. This case is effective when the width of the four rubber hoses is larger than the width of the center cylinder 10. Hose pulleys 44a, 44 for twin rubber hose respectively
Twin rubber hoses 35 and 36 each of which is a pair of two rubber hoses are wound around b.

[0021]

As described above, the present invention has a configuration as described in detail above, so that the number of flexible tubes disposed inside the inner mast and between the inner mast and the center cylinder is reduced, and the space becomes wider. , A good front view can be secured. Further, when the carriage is raised, the number of pipes in front is reduced, and similarly, a good front view of the operator can be secured. Further, since the twin hose is used, the width of the hose pulley can be reduced, and four flexible tubes can be accommodated within the width of the center cylinder. In addition, since the hose pulleys are separately supported, there is no slippage between the flexible tube and the hose pulley. By using a twin hose, flapping and torsion are reduced, and a three-stage mast piping structure of a forklift with less risk of damage can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a three-stage mast type forklift having a piping structure of the present invention.

FIG. 2 is a sectional view of a first embodiment of a hose pulley for a twin hose according to the present invention.

FIG. 3 is a front view of an outer mast and a middle mast showing a piping structure of the present invention.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a front view of a middle mast and an inner mast showing a piping structure of the present invention.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a sectional view of a second embodiment of the hose pulley for a twin hose according to the present invention.

FIG. 8 is a front view of a three-stage mast type forklift having a conventional piping structure.

FIG. 9 is a side view of FIG. 7;

[Explanation of symbols]

2 Outer mast 3 Middle mast 4 Inner mast 5 Carriage 10 Center cylinder 11 Piston rod 15 Bracket 17a, 17b, 44a, 44b Hose pulley for twin rubber hose 20, 22, 24, 32, 33 Piping 25, 26, 35, 36 Twin hose 30, 31, 37 Hose pulley

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-7-157295 (JP, A) JP-A-55-140494 (JP, A) JP-A-57-175699 (JP, A) JP-A-6-157699 227798 (JP, A) Fully open 1987-150496 (JP, U) Fully open 1984-80394 (JP, U) Fully open 1988-103595 (JP, U) Fully open 1986-168097 (JP, U) Japanese Utility Model Showa 62-116093 (JP, U) Japanese Utility Model Hei 1-147390 (JP, U) Japanese Utility Model Showa 62-132099 (JP, U) Japanese Utility Model Showa 58-95997 (JP, U) (58) (Int.Cl. ⁷ , DB name) B66F 9/08 B66F 9/22

Claims (2)

(57) [Claims] 1. A pair of left and right outer masts mounted on a front part of a vehicle body, a pair of left and right middle masts supported vertically inside the outer masts, and vertically supported inside the middle masts. A pair of left and right inner masts,
A carriage for mounting various attachments vertically supported on the inner mast, a center cylinder mounted upright on the inner mast and vertically moving the carriage up and down, and pressurized oil from a hydraulic device attached to the vehicle body. In a hydraulic piping system for a three-stage mast type forklift having a flexible tube for supplying various attachments to a hydraulic cylinder, a tip end of a piston rod of the center cylinder and four flexible tubes are provided on a front side of the center cylinder. and two hose pulley as in the rear fall within the width of the center cylinder, in parallel to the coaxial or arranged stacked vertically and separated by a predetermined distance, and two placement of the
Hose pulleys are supported by bearings independently.
In addition, the flexible tube applied to the hose pulley has two
Hydraulic piping system for a three-stage mast type forklift, characterized in that it is a twin hose integrally formed with a rubber hose . 2. A pair of left and right outers mounted on a front portion of a vehicle body.
A mast and a vertically movable inside of the outer mast
A pair of left and right middle masts and the inside of the middle mast
A pair of left and right inner masts supported vertically
Various attachments supported vertically on the inner mast
Upright on the carriage and the inner mast
A center that is attached and lifts the carriage up and down
Various types of hydraulic oil from the hydraulic equipment attached to the
Flexibility to supply to the hydraulic cylinder that drives the attachment
Hydraulic piping for three-stage mast type forklift with pipe
A hose plug on the back of the upper end of the middle mast.
And the hydraulic equipment of the vehicle body and the carriage
Connect the attached hydraulic equipment with various attachments 4
At least two of the flexible tubes are connected to the hoe.
Wrap it around the mast so that it overlaps behind the mast
And the flexible tube for the hose pulley is 2
A hydraulic piping device for a three-stage mast-type forklift , comprising a twin hose integrally formed with two rubber hoses .