JPH0773443B2 - Hose connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention relates to a plurality of hose connecting pipes attached to a first device and a plurality of hose connecting pipes attached to a second device. The present invention relates to a hose connection structure for connecting and with the same system by a plurality of hoses.

(2) Related Art Conventionally, when connecting a plurality of hose connecting pipes of a first device and a plurality of hose connecting pipes of a second device with a plurality of hoses between the same system, in order to prevent erroneous connection , The connection pipes and hoses are color-coded by system.

(3) Problems to be Solved by the Invention With the above-mentioned means for preventing incorrect connection of the hose, not only is the color-coding work troublesome, but there is the risk of making mistakes in the color-coding work, and within a long period of time. May discolor and interfere with subsequent maintenance.

The present invention has been made in view of the above circumstances, and provides a simple and effective hose connection structure capable of always preventing an incorrect connection of a hose without performing color coding for each system. With the goal.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention forms a plurality of hoses of equal length and shifts these hoses from each other by a certain distance in the longitudinal direction. In a state such that the tip positions of the plurality of hose connection pipes of the first device correspond to one end of the plurality of hoses, and the tip positions of the plurality of hose connection pipes of the second device correspond to the other end of the plurality of hoses, respectively. The feature is that they are set to shift.

(2) Action When connecting the plurality of hose connection pipes of the first device and the plurality of hose connection pipes of the second device with the plurality of hoses,
A plurality of bundled hoses are arranged between the first and second devices, and one end of these hoses and a plurality of hose connecting pipes of one device are connected to each other in close proximity to each other, and the other ends of these hoses are connected. And a plurality of hose connecting pipes of the other device are connected to each other in close proximity to each other, whereby hose connecting pipes of the same system can be accurately connected.

(3) Embodiment One embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, an engine 3 is mounted on a front portion of a vehicle body frame 2 of a riding type tractor 1, and a pair of left and right front wheels 4 are steerably suspended. Further, a transmission unit 5 is attached to the rear end of the body frame 2, and a pair of left and right rear wheels 6 are rotatably suspended under the transmission unit 5.
Further, a worker's seat 7 is arranged above the transmission unit 5, and the seat 7 has a front end supported by a bracket 8 fixed to the upper surface of the transmission unit 5 via a pivot 9, and is in a normal use position (position indicated by a solid line). And a maintenance position (position indicated by a chain line) tilted forward can be rotated.

A steering wheel column 10 is erected on the vehicle body frame 2 at an intermediate position between the seat 7 and the engine 3, and front and rear wheels 4,
A steering wheel 11 for steering 6 is pivotally supported.

The transmission unit 5 includes a clutch, a transmission, a rear differential device, and a front wheel drive shaft so that it can drive not only the rear wheels 6 but also the front wheels 4 by receiving the power of the engine 3.

At the front end of the body frame 2, an elevating arm 13 having a hitch box 12 for connecting a working machine at the front end is pivotally supported so as to be vertically swingable. A piston 15 of a single-acting front lift cylinder 14 installed on the vehicle body frame 2 is connected to the elevating arm 13 via a link mechanism 16, and the elevating arm 13 is lifted by hydraulically driving the piston 15. When released, the lifting arm 13 is lowered by its own weight.

As shown in FIGS. 1 and 2, a rear lift cylinder 17 is installed on the transmission unit 5 immediately below the seat 7, and a working machine 18 such as a rotary cultivator that is lifted and lowered by the rear lift cylinder 17 has a link mechanism. It is connected to the rear end of the transmission unit 5 via 19.

The link mechanism 19 includes one top link 20 pivotally supported by the transmission unit 5 so as to be vertically swingable, and the top link 20.
A pair of left and right lower links 21, which are pivotally supported on the transmission unit 5 so as to be vertically swingable below 20, are provided to allow the working machine 18 to move up and down and to tilt left and right with respect to the tractor 1. Further, the link mechanism 19 includes a pair of left and right lift arms 22 and 22, and the lift arms 22 and 22 connected to the lower link.
A pair of left and right lift rods 23, 23 connected to 21, 21 respectively
The lift arms 22 and 22 are fixed to a lifting drive shaft 25 that is interlocked with a piston 24 of the rear lift cylinder 17.

Thus, by swinging the lift arm 22 upward by hydraulically driving the piston 24, the working machine 18 can be raised via the link mechanism 19, and by releasing the hydraulic pressure, the working machine 18 is lowered by its own weight. be able to.

One of the pair of lift rods 23, 23, the lift rod 23 'on the right side in the illustrated example, is partially extendable by a retractable telescopic cylinder 26, and the telescopic cylinder 26 operates. Thereby, the working machine 18 can be tilted to the left and right with respect to the tractor 1 to maintain the horizontal state.

A hydraulic control device 28 for controlling the supply of pressure oil to the three cylinders 14, 17, 26 and the external hydraulic loader 27 is provided on one side surface of the rear lift cylinder 17, that is, the right side surface in the illustrated example.

As shown in FIG. 3, the hydraulic control device 28 includes a substantially cubic distribution block 29 that is detachably joined to the right side surface of the rear lift cylinder 17 with a bolt immediately below the seat 7.
A front / rear switching block 30 which is detachably joined to the rear surface R of the distribution block 29 by a bolt, and a front surface F of the distribution block 29.
Control block 31 that is detachably mounted on the outer surface S of the distribution block 29, and a lift control valve that is detachably mounted on the outer surface S of the distribution block 29.
32 and the lowering control valve 33, and a hydraulic pressure take-out block 34 detachably joined to the upper surface T of the distribution block 29 with bolts.

As shown in FIG. 4, the distribution block 29 has a main relief valve.
35, diversion valve 36, unload valve 37, one-way valve 38 and down valve
39 is provided. Oil passage 40 connected to the inlet of the main relief valve 35
The oil in the oil sump 57 is sent under pressure by the hydraulic pump 56. The hydraulic pump 56 is mounted on the transmission unit 5 and driven by a clutch input member therein, and the oil sump 57 is constituted by the bottom wall of the transmission unit 5.

The pressure oil sent from the hydraulic pump 56 and adjusted by the main relief valve 35 flows into the inlet 36a of the diversion valve 36 via the oil passage 40, the hydraulic pressure take-out block 34, and the oil passage 41. Then, in the flow dividing valve 36, a constant amount of pressure oil is supplied from the first outlet 36b, and the second outlet 36c.
From the first outlet 36b to the horizontal control block 31 through the oil passage 42, and the second pressure oil from the second outlet 36b.
The pressure oil from the outlet 36c is sent through the oil passage 43 to the inlets 37a, 38a of the unload valve 37 and the one-way valve 38.

The one-way valve 38 opens only when the inlet 38a becomes higher in pressure than the outlet 38b, and the outlet 38b opens at the inlet 3 of the down valve 39.
9a, and also communicates with the front / rear switching block 30 via the oil passage 44.

The down valve 39 is a valve body that opens and closes between the inlet 39a and the outlet 39b.
58 and a back pressure chamber 59 capable of introducing a hydraulic pressure for pressing the valve body 58 toward the closing side, and the back pressure chamber 59 communicates with the inlet 39a through an orifice 60 provided in the valve body 58. To do. The outlet 39b is opened to the oil sump 57, and the control oil passage 48 extending from the back pressure chamber 59 communicates with the oil sump 57 via the lowering control valve 33.

The unload valve 37 has a valve body 61 that opens and closes between the inlet 37a and the outlet 37b, and a back pressure chamber 62 that can introduce a hydraulic pressure that presses the valve body 61 toward the closing side. Communicates with the inlet 37a through an orifice 63 provided in the valve body 61.
Further, the outlet 37b is opened to the oil sump 57, and the control oil passage 49 extending from the back pressure chamber 62 communicates with the oil sump 57 via the rise control valve 32.

The ascending control valve 32 is a normally open solenoid valve, and the descending control valve 33 is a normally closed solenoid valve.

Thus, when the raising control valve 32 is closed while the lowering control valve 33 is closed in order to give the raising operation to the front lift cylinder 14 or the rear lift cylinder 17, the unload valve 37 causes the second valve of the diversion valve 36 to be closed. Since the pressure oil that has exited from the outlet 36c passes through the orifice 63 and is retained in the back pressure chamber 62, it receives the oil pressure and the valve body 61
Closes entrance 37a. Also in the lowering valve 39, the pressure oil that has passed through the one-way valve 38 is retained in the back pressure chamber 59 through the orifice 60, and thus the valve body 58 closes the outlet 39b in response to the hydraulic pressure. As a result, the pressure oil that has passed through the one-way valve 38 is sent to the front lift cylinder 14 or the rear lift cylinder 17 via the oil passage 44 and the front / rear switching block 30, and is given a raising operation.

Also the front lift cylinder 14 or the rear lift cylinder 17
When the descending control valve 33 is opened while the ascending control valve 32 is opened in order to give the descending operation to the back pressure chambers 62 and 59 of the unload valve 37 and the descending valve 39, the ascending control valve 32 and the descending control valve 33 are opened. Since it is opened to the oil sump 57 via each, the valve element 6 in the unload valve 37 and the descending valve 39 by the pressure of the respective inlets 37a, 39a.
1, 58 opens, and the pressure oil that has exited the second outlet 36c of the flow dividing valve 36 passes straight through the unload valve 39, that is, flows back from the outlet 37b to the oil sump 57. The oil previously sent to the front lift cylinder 14 or the rear lift cylinder 17 passes through the forward / backward switching block 30 and passes through the lowering valve 39, that is, flows back from the outlet 39b to the oil sump 57. As a result, the front lift cylinder 14 or the rear lift cylinder 17 performs the lowering operation due to the weight of its load side.

The front / rear switching block 30 includes the first and second poppet valves 64 ₁ ,
64 ₂ , a cam shaft 65 for opening and closing the poppet valves 64 ₁ , 64 ₂ , a slow-down valve 66, and an overload relief valve 67 are provided.

Both the first and second poppet valves 64 ₁ and 64 ₂ are normally closed type, and the cam shaft 65 has a phase to alternately open and close these poppet valves 64 ₁ and 64 ₂ by reciprocating rotation of a predetermined angle. It has a pair of different cams 65a, 65b. The cam shaft 65 is rotated by a switching lever 68 fixed to one end thereof.

The inlets of the first and second poppet valves 64 ₁ and 64 ₂ communicate with each other and with the oil passage 44. The outlet of the first poppet valve 64 ₁ is connected to the hydraulic chamber 70 of the rear lift cylinder 17 via the oil passage 45 in the distribution block 29 and the oil passage 110 passing through the wall of the rear lift cylinder 17, and the second poppet. valve
64 _second outlet is communicated to the inlet 66a of the slow descent valve 66.

Then, the cam shaft 65 is rotated in one direction to rotate the first poppet valve 64.
_When only ₁ is opened, only the rear lift cylinder 17 communicates with the oil passage 44 of the distribution block 29, and the ascending / descending operation can be performed by the above-described control of the ascending control valve 32 and the descending control valve 33.
Also by opening only the second poppet valve 64 ₂ to rotate the cam shaft 65 in the other direction, only the rear lift cylinder 17 is communicated with the oil passage 44, the vertical movement under the control of the increase control valve 32 and the lowering control valve 33 Is possible.

The slow-down valve 66 includes a check valve 71 that allows the flow of oil from the inlet 66a to the outlet 66b but tries to prevent the flow in the opposite direction, and an adjustment bolt 72 that adjusts the minimum opening degree of the check valve 71. The outlet 66b is connected to the hydraulic chamber 69 of the front lift cylinder 14 via an oil passage 47 and a hydraulic hose 111 (see FIG. 1) extending from the front / rear switching block 30.

Therefore, when the pressure oil that has passed through the second poppet valve 64 ₂ flows into the inlet 66a of the slow descent valve 66, since the check valve 71 is open wide, front lift cylinder pressure oil is rapidly transit slow descent valve 66 It is supplied to fourteen hydraulic chambers 69 and gives it a rising action at a relatively high speed. On the contrary, during the descending operation, the oil discharged from the hydraulic chamber 69 is discharged from the outlet 66b of the gentle descending valve 66.
The check valve 71 is held at the minimum opening degree by the adjusting bolt 72 because it flows backward from the inlet 66a to the inlet 66a, and regulates the oil discharge speed. As a result, the front lift cylinder 14 slowly descends.

The overload relief valve 67 communicates its inlet with an oil passage 47 connecting the outlet 66b of the slow-down valve 66 and the front lift cylinder 14, and opens when the pressure in the oil passage 47 rises excessively. Speak,
The excess pressure is released to the oil sump 57. Therefore, even if the working machine lifted by the front lift cylinder 14 receives an overload due to a collision with another object, for example, the load can be alleviated.

As described above, the front / rear switching block 30 includes the first and second poppet valves 64 ₁ and 64 ₂ , the cam shaft 65, the slow down valve 66, and the overload relief valve 6.
Since the 7 are provided as a group, inspection and maintenance thereof can be easily performed by removing the front-rear switching block 30 from the distribution block 29. At that time, since the oil passages having a relatively small diameter are only opened on the separation surfaces of the distribution block 29 and the front-rear switching block 30, there is a very low risk of dust and the like entering.
Further, since the slow-down valve 66 and the overload relief valve 67 are provided in the front-rear switching block 30, the structure of the front lift cylinder 14 is simplified and one hydraulic hose is provided in the front lift cylinder 14. It is enough to connect 111, and the piping structure is simple.

In FIG. 5, the cylinder head 73 of the rear lift cylinder 17 is provided with a slow down valve 74 and an overload relief valve 75.
The slow-down valve 74 causes the rear lift cylinder 17 to descend at a slow speed, and the overload relief valve 75 causes the rear lift cylinder 17 to be overloaded and the pressure in the hydraulic chamber 70 excessively rises. At this time, the excess pressure is released to the oil sump 57. Their structure is the slow down valve 66 and the overload relief valve.
Since it is basically the same as 67, the description of those structures will be omitted.

Referring again to FIG. 4, the horizontal control block 31 includes a switching valve 7
6, first and second solenoid valves 77 ₁ and 77 ₂ , first and second orifices 78 ₁ and 78
₂ and a relief valve 79.

The switching valve 76 includes a spool 80, a return spring 81 that biases the spool 80 to a neutral position, and a housing 82 that houses these.
The housing 82 has a central inlet 83, a pair of outlets 84 ₁ and 84 ₂ on both sides thereof, a pair of outlets 85 ₁ and 85 ₂ on both sides thereof, and a pair of pressure receiving members on both sides thereof. Room 8
It has 6 ₁ , 86 ₂ . The inlet 83 communicates with the oil passage 42 of the distribution block 29 via the oil passage 51, and the outlets 84 ₁ and 84 _{2 form a} pair of hydraulic pressures in the upper and lower oil chambers 26a and 26b (Fig. 8) of the telescopic cylinder 26. Connected via hoses 87, 87, respectively. Further, the first escape port 85 ₁ communicates with the first pressure receiving chamber 86 ₁ via the first orifice 78 ₁ and the oil passage 53, and also serves as the oil reservoir 57 via the first orifice 78 ₁ and the first electromagnetic valve 77 _1. Communicate. The second escape port 85 ₂ communicates with the second pressure receiving chamber 86 ₂ via the second orifice 78 ₂ and the oil passage 54, and also communicates with the oil sump 57 via the second orifice 78 ₂ and the second electromagnetic valve 77 _2. To do. Further, both the escape ports 85 ₁ and 85 ₂ also communicate with the oil sump 57 via the relief valve 79.

Each of the first and second solenoid valves 77 ₁ and 77 ₂ is a normally open type.

When the tilt sensor (not shown) installed in the tractor 1 senses the tractor 1 descending to the right, the first solenoid valve 77
_When the valve closing signal is sent to ₁ and the downward left is sensed, the valve closing signal is sent to the second solenoid valve 77 ₂ .

When the first solenoid valve 77 ₁ is closed, the first pressure receiving chamber 86 ₁ of the switching valve 76 ₁
The pressure rises and the spool 80 is moved to the right in the figure. When the spool 80 moves to the right, the first outlet 84 ₁ is blocked from the first escape port 85 ₁ and communicates with the inlet 83, and the second outlet 84 ₂ is blocked from the inlet 83 and communicates with the second escape port 85 _2. Therefore, the pressure oil sent from the shunt valve 36 to the inlet 83 passes through the first outlet 84 ₁ and the telescopic cylinder 2
6 is supplied to the upper oil chamber 26a. On the other hand, the oil in the lower oil chamber 26b is the second outlet 84 ₂ , the second escape port 85 ₂ , the second orifice 78 ₂
Then, the oil is discharged to the oil sump 57 via the second solenoid valve 77 ₂ . As a result, the telescopic cylinder 26 extends to tilt the work implement 18 to the right with respect to the tractor 1 tilting to the left.

When the second solenoid valve 77 ₂ is closed, the pressure in the second pressure receiving chamber 86 ₂ of the switching valve 76 rises and the spool 80 is moved to the left in the figure.
When the spool 80 moves to the left, the second outlet 84 ₂ is at the second escape port 85 ₂
Since the first outlet 84 ₁ is blocked from the inlet 83 and communicates with the first escape port 85 ₁ , the pressure oil sent from the flow dividing valve 36 to the inlet 83 is blocked by the second outlet 84 1. ₂ is supplied to the lower oil chamber 26b of the telescopic cylinder 26 while being supplied to the upper oil chamber 26a.
The oil of the first outlet 84 ₁ , the first escape 85 ₁ , the first orifice 78
_The oil is discharged to the oil sump 57 via the _first and first solenoid valves 77 ₁ . As a result, the telescopic cylinder 26 contracts to tilt the work implement 18 to the left with respect to the tractor 1 tilting to the right. In this way, the working machine 18 is always kept horizontal.

When the work implement 18 becomes horizontal, both solenoid valves 77 ₁ and 77 ₂ return to the open state, and the pressures in the first and second pressure receiving chambers 86 ₁ and 86 ₂ are released, so that the spool 80 returns the spring 81 to the return spring 81. Is held in the neutral position by. In the neutral position of the spool 80, the inlet 83 communicates with both the escape ports 85 ₁ and 85 ₂ almost equally, so that the escape ports 8
Due to the throttling resistance of both orifices 78 ₁ and 78 ₂ communicating with 5 ₁ and 85 ₂ , the pressure oil flowing into the inlet 83 causes the upper and lower oil chambers 26 a and 26 b to have substantially the same pressure. Thus
The telescopic cylinder 26 is fixed to the length at that time.

As shown in FIG. 8, the first, first contiguous respectively second to outlet 84 _1, 84 _2, the second hose connecting pipe 89 _1, 89 ₂ is attached on the outer surface of the horizontal control block 31 . On the other hand, on the outer side surface of the telescopic cylinder 26, first and second hose connecting pipes 90 ₁ and 90 ₂ respectively connected to the upper oil chamber 26a and the lower oil chamber 26b are attached. The one hydraulic hose 87 is connected between the first hose connecting pipes 89 ₁ and 90 ₁ , and the second hose connecting pipes 89 ₂ and 90 ₂ are connected.
Both ends of the other hydraulic hose 87 are connected to.

The pair of hoses 87, 87 are formed to be substantially equal in length to each other and are bound by a coil member 91 in a state in which a certain distance L is displaced from each other in the longitudinal direction. Correspondingly, in the horizontal control block 31, the tip of the first hose connecting pipe 89 ₁
From the tip of the hose connecting pipe 89 ₂ is projected by the distance L, which first hose connecting pipe in telescopic cylinder 26 in the opposite
The tip of 90 _{1 is set back from} the tip of the second hose connecting pipe 90 _{2 by} the distance L.

Therefore, at the time of piping, one end of both hydraulic hoses 87, 87 and the first and second hose connecting pipes 89 ₁ , 89 of the horizontal control block 31 are connected.
Connect the _two that are close to each other, and both hydraulic hoses 8
The other end of 7,87 and the first and second hose connecting pipe 90 of the telescopic cylinder 26
_1, 90 by connecting the the mutually adjacent with ₂ inevitably first hose connecting pipe 89 _1, 89 ₂ to each other, and a second hose connecting pipe 9
Since 0 ₁ and 90 ₂ are connected to each other, erroneous connection such as connecting the first hose connecting pipe 89 ₁ and the second hose connecting pipe 90 ₂ can be prevented. That is, both hydraulic hoses 87,87
Not only the directionality of the first and second connecting pipes 89 _{1 of} each hose 87 ₁ ,
Since it is not necessary to consider the correspondence with 90 ₁ ; 89 ₂ , 90 ₂ , it is possible to perform the piping work accurately and quickly. In the above, the horizontal control block 31 corresponds to the first device of the present invention, and the telescopic cylinder 26 corresponds to the second device.

Referring again to FIG. 4, the hydraulic pressure take-out block 34 includes the first and second hose connection ports 92 ₁ and 92 ₂ and these hose connection ports 92 ₁ and 9 2.
An oil passage 93 and 94 for communicating the 2 ₂ to the oil passage 40 and 41 opening into the distribution block 29 upper surface is formed, the cock 95 so as to cross the Ryoaburaro 93 and 94 are disposed.

When the cock 95 is in the open position O (see FIG. 7), the oil passages 93, 9
A pair of through-holes 96 and 97 for connecting 4 respectively, and a groove 9 for short-circuiting both oil passages 93 and 94 at the closed position C (see FIG. 7).
8 and.

The high pressure hose 100 connected to the high pressure portion of the external hydraulic loader 99 is connected to the first hose connection port 92 ₁ , and the second hose connection port 92 ₂
A low pressure hose 101 connected to the low pressure part is connected to the.

Then, when the cock 95 is rotated to the open position O to operate the external hydraulic loader 99, the pressure oil sent from the hydraulic pump 56 is supplied to the external hydraulic loader 99 through the oil passages 40 and 93 and the high pressure hose. The pressure oil that has finished operating is sent to the flow dividing valve 36 through the low pressure hose 101 and the oil passages 94 and 41. When the external hydraulic loader 99 is operating, normally, the front and rear lift cylinders 1
Since 4, 17 are placed in an inoperative state, the pressure oil that has exited the second outlet 36c of the flow dividing valve 36 opens the unload valve 37 and flows back to the oil sump 57.

When the cock 95 is rotated to the closed position C in order to stop the operation of the external hydraulic loader 99, the oil passages 93 and 94 are short-circuited and the supply of pressure oil to the external hydraulic loader 99 is stopped. Then the oil passage
By short-circuiting 93, 94, pressure oil can be supplied to the front and rear lift cylinders 14, 17.

As shown in FIGS. 6 and 7, the hydraulic pressure take-out block 34
Is flat so that it can be arranged in a small space between the distribution block 29 and the seat 7, the cock 95 is arranged horizontally, and the hose connection ports 91 ₁ , 92 ₂ are high,
The low pressure hoses 100 and 101 are provided on the left and right side surfaces of the hydraulic pressure take-out block 34 so as not to interfere with the seat 7.

An operating lever 102 is pivotally supported 103 at the outer end of the cock 95. The operating lever 102 can be rotated between a retracted position that is coaxial with the cock 95 and a use position that stands upright at a right angle to the cock 95. A torsion coil spring 104 that is biased toward is attached. Incidentally, 105 is a retaining plate for preventing the cock 95 from being pulled out from the hydraulic pressure take-out block 34.

Thus, when operating the cock 95, first, the seat 7 is rotated forward with the pivot 9 as the fulcrum (the state shown by the chain line in FIG. 1).
Open the upper surface of the hydraulic pressure take-out block 34, and then
When the 102 is raised to the use state, the cock 95 can be easily rotated to the open position O or the closed position C via the operation lever 102 without being disturbed by the seat 7.

After the operation, if the operator releases the operating lever 102, the force of the spring 104 immediately returns the operating lever 102 to the retracted position.
Even if is set to a fixed position, interference with the seat 7 is avoided.

It should be noted that the oil passages shown to open to the oil sump 57 in blocks 29, 30, and 31 of FIG. 4 actually pass through the distribution block 29.

FIG. 9 shows the front lift cylinder 14 and the external hydraulic loader 99.
The following shows an example of the case without equipment. In this case, the first lid plate 105 is joined to the rear surface R of the distribution block 29 in place of the front / rear switching block 30, and the second lid plate 106 is joined to the upper surface T of the distribution block 29 in place of the hydraulic pressure take-out block 34 with bolts. To be done. Since the first cover plate 105 is provided with the communication passage 107 that connects the oil passages 44 and 45, the lift control valve 32 and the fall control valve 33 are controlled as described above to move up to the rear lift cylinder 17. A descending motion can be given. The second lid plate 10
Since the communication passage 108 connecting the oil passages 40 and 41 is provided in the valve 6, the pressure oil can be supplied to the flow dividing valve 36 without any trouble.

C. Effects of the Invention As described above, according to the present invention, a plurality of hoses are formed to have the same length, and the hoses are bundled in a state in which they are displaced from each other by a certain distance in the longitudinal direction. The tip positions of the connecting pipes are set to one end of the plurality of hoses, and the tip positions of the plurality of hose connecting pipes of the second device are set to be shifted corresponding to the other ends of the plurality of hoses. One end of the hose and a plurality of hose connection pipes of one device are in close proximity to each other, and the other end of these hoses and a plurality of hose connection pipes of the other device are in close proximity to each other. Thus, the hose connecting pipes of the same system can be accurately connected, and erroneous connection can be prevented without paying special attention. Therefore, unlike the conventional color-coded type, extra work for preventing erroneous connection is unnecessary, and since erroneous connection can be prevented permanently, it is effective during maintenance.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view of a passenger tractor, FIG. 2 is a rear perspective view of the tractor with a work implement connected to the rear, and FIG. 3 is hydraulic control of the tractor. FIG. 4 is a perspective view of the device, FIG. 4 is a hydraulic circuit diagram of the tractor,
FIG. 5 is a vertical sectional side view of a main part of a rear hydraulic cylinder in the tractor, FIG. 6 is a horizontal cross-sectional plan view of a hydraulic pressure take-out block of the hydraulic control device, FIG. 7 is a view taken along arrow VII of FIG. 6, and FIG. FIG. 9 is a piping diagram between the horizontal control block of the hydraulic control device and the horizontal control telescopic cylinder of the working machine, and FIG. 9 is a hydraulic circuit diagram when the front / rear switching block and the hydraulic take-out block are removed from the hydraulic control device. . 26: Telescopic cylinder as second equipment, 31 ... Horizontal control block as first equipment, 87 ... Hose, 89 ₁ , 89 ₂ ...
… Hose connection pipe for the first device, 90 ₁ , 90 ₂ …… Hose connection pipe for the second device, L …… Constant distance

Claims (1)

[Claims] 1. A hose connection structure in which a plurality of hose connection pipes attached to a first device and a plurality of hose connection pipes attached to a second device are connected to each other by a plurality of hoses in the same system. Along with forming the hoses of equal length, these hoses are bundled in a state where they are displaced from each other by a certain distance in the longitudinal direction, and the tip positions of the plurality of hose connecting pipes of the first device are connected to one end of the plurality of hoses and the second hose connecting pipes A hose connection structure characterized in that the tip positions of a plurality of hose connection pipes of two devices are set so as to be shifted corresponding to the other ends of a plurality of hoses, respectively.