JPH0518974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coupling device in a hydraulic oil supply system to a working machine.

(Prior art) As shown in Japanese Utility Model Application Publication No. 58-106456, when the loader is attached to and detached from the vehicle, in the hydraulic oil supply system to the loader, for example, the vehicle side joint part and the loader side joint part for four In some cases, a self-sealing type joint is constructed by the corresponding vehicle-side joint part and loader-side joint part, respectively.

(Problems to be Solved by the Invention) In the above-mentioned conventional art, no structure was adopted to facilitate the connection and release of the vehicle side joint part and the loader side joint part; For example, it is necessary to get off the vehicle and hold the four loader-side joints one by one in order to connect and release them from the corresponding vehicle-side joints, which is troublesome to connect and release. My hands get dirty,
Another problem was that alignment of the joints was difficult.

An object of the present invention is to provide a coupling device for a working oil supply system to a working machine that can solve the above-mentioned problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the means adopted by the present invention is such that when the working equipment 23 and the vehicle 1 are attached and detached, the hydraulic oil supply system from the vehicle 1 to the working equipment 23 is , in which the vehicle side joint portion 53 and the work equipment side joint portion 54 are attached and detached, and both joint portions 53 and 54 constitute a self-sealing type joint 51, the vehicle side joint portion 53 is connected to the vehicle 1 on the vehicle side. Holder 56
The work machine side joint part 54 is provided on the work machine side holding body 86, and the work machine side holding body 86 is provided on the work machine side so as to be swingable in the vertical direction. Elastic support means 92 and 95 are provided for resiliently supporting the work equipment holder 86 on the work machine side while facing the vehicle joint portion 53 in the longitudinal direction, and the work equipment side holder 86 is supported on the vehicle side holder 56. By bringing them closer, both the joint parts 53, 5 on the vehicle side and the work machine side
The point is to connect 4.

(Function) When the vehicle side joint part 53 and the work machine side joint part 54 are connected, the work machine side holding body 86 provided with the work machine side joint part 54 swings in the vertical direction, and moreover, the elastic support means 92, 95 Since it is elastically supported on the work machine side, the vehicle side joint part 53 and the work machine side joint part 54 are aligned, and in this state, the work machine side holding body 86 is brought close to the vehicle side holding body 56. , both joint portions 53 and 54 on the vehicle side and the working machine side are connected.

(Embodiment) Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIGS. 5 and 6, 1 is a vehicle shown as a tractor, 2 is a vehicle body, and on the rear upper surface of the vehicle body 2, A hydraulic system 4 for lifting and lowering a working machine is mounted, which has a pair of left and right lift arms 3. 5 is the rear wheel, 6
1 is a rear wheel fender, and 7 is a floor seat that covers the hydraulic system 4 and the vehicle body 2 from above and connects both rear wheel fenders 6. 8 is a steering wheel, and 9 is a rear-facing seat.

A pair of left and right lower links 10 are pivotally supported on both left and right sides of the rear end of the vehicle body 2 so as to be able to rise and fall, and are connected to the lift arm 3 via a lift rod 11.

Reference numeral 12 denotes a connecting body, which is pivotally connected to the rear end portions of both lower links 10, and has a pair of left and right backing plates 13 at the center in the left and right direction, and a connecting body that is perpendicular to the backing plates 13 between the two backing plates 13. A protrusion 14 that protrudes upward.
is formed. The center of gravity of the connecting body 12 is located below the pivot point relative to the lower link 10, and when the connecting body 12 is in a free state, the protrusion 14 always points upward.

A lower connecting bracket 15 projects rearward from the rear surface of the vehicle body 2, and a connecting pin 16 is disposed at the rear end of the lower connecting bracket 15 in the left-right direction.

Reference numeral 17 denotes an upper connection bracket that projects rearward from the rear surfaces of the vehicle body 2 and the hydraulic system 4, and has a connection recess 18 cut out from the rear end and opening laterally.

Reference numeral 19 denotes a retaining body, which is pivotally supported on the upper connecting bracket 17 by a support shaft 20 in the left and right direction so as to be vertically swingable, and opens and closes the rear end opening of the connecting recess 18.
The retainer 19 is biased in the closing direction by a spring (not shown) and is opened by an operating mechanism (not shown). A cam portion 21 is formed on the rear end surface of the retaining body 19 and has an upwardly inclined cam portion 21 .

23 is a loader exemplified as a working machine, and the vehicle body 2
It is detachably attached to the rear part of the body, and includes a mounting member 24, a first arm 26 which is pivotably supported at the upper end of the mounting member 24 and the front part by a support shaft 25 in the left and right direction, and a first arm 26, which can be freely raised and lowered. A second arm 28 is pivotally connected to the rear end of 26 by a support shaft 27 in the left and right direction so as to be able to rise and fall freely, and a cylinder tube is pivotally connected to the front end of the front protrusion 29 from the second arm 28 by a support shaft 30. a lift cylinder 32 whose piston rod is pivotally connected to the lower end of the front part of the mounting member 24 by a support shaft 31;
an interlocking arm 34 whose other end is pivotally connected to the rear end of the mounting member 24 by a support shaft 33;
, a bucket belt 35 pivotally supported on the rear end of the second arm 28 , a bucket cylinder 37 for rotating the bucket belt 35 via a link mechanism 36 , and a bucket belt 35 pivoted on the rear end of the mounting member 24 by a support shaft 38 . It has a stand 39 etc. which is pivotally supported so as to be movable.

An engaging portion 40 that removably engages with the connecting pin 16 is cut out at the lower end of the front end of the mounting member 24, and a connecting recess 18 is formed at the vertical center of the front end of the mounting member 24. Connecting pins 41 that are removably engaged with are disposed in the left-right direction.

Then, attach the connecting body 12 to the mounting member 24 on the plate 1.
3 and the protruding portion 14 from below in a removable manner, and the mounting member 24 is reliably fixed to the vehicle body 2.

The hydraulic oil supply system to the loader 23 is constructed as shown in FIG.
A master valve 46 is connected via 5.

A main relief valve 47 and a pressure drop reduction valve 48 are built into the hydraulic pressure extraction block 45. 4A
is a control valve of the hydraulic system 4 for lifting and lowering the working machine.

The master valve 46 includes a lift cylinder control valve 49 and a bucket cylinder control valve 50, and these control valves 49 and 50 are connected to the lift cylinder 32 and the bucket cylinder 37, respectively.
They are connected via a pair of self-sealing type joints 51.

Note that a shutoff socket 52 is interposed between the oil chamber on the side opposite to the piston rod of each cylinder 32, 37 and the joint 51.

By the way, each of the joints 51 includes a vehicle side joint part 53 which is a male type, and a loader side joint part 54 which is a female type.
It is composed of.

First, to explain how the vehicle side joint part 53 is installed in the vehicle body 2, as shown in FIGS. 1 to 4 and 12, a mounting bracket is attached to the upper part of the rear end of the floor seat 7. 55 is fixedly installed,
A vehicle-side holder 56 is provided on both left and right sides of the mounting bracket 55 to hold bolts 57, nuts 58, and collars 5.
9, it is rotatable back and forth.

The vehicle side joint portion 53 is disposed vertically and in pairs on the left and right sides of the vehicle side holding body 56, as shown in FIGS. 14 and 1.
As shown in FIG. 5, a housing 60 is inserted into the vehicle-side holder 56, a cylindrical guide 61 is built into the housing 60, and a ball 62 is built into the distal end of the housing 60 so as to be movable in the axial direction. , a spring 63 is interposed in a resilient manner between the ball 62 and the guide 61 to press the ball 62 forward in the axial direction.

A stepped portion 64 and a circumferential engaging groove 65 are formed at the tip of the outer peripheral surface of the housing 60, and an oil passage is formed in the wall portion of the guide 61 and the like.

A connecting tube 66 is screwed to the base of the housing 60, and is inserted into a hollow-shaped insertion hole 67 of the vehicle-side holder 56. A flat washer 68 is provided between the base end surface of the housing 60 and the vehicle holder 56, and the vehicle-side joint portion 53 and the connecting tube 66 are connected to the vehicle-side holder 56 by the housing 60 and the flange portion 69 of the connecting tube 66. It is held movable up, down, left and right.

A hydraulic hose 70 is connected to the connecting pipe 66.

As shown in FIG. 16, reference numeral 71 denotes a pair of left and right guide pins, which are inserted into the left and right sides of the vehicle-side holder 56 in a rearwardly protruding manner, and have conical tips.

Reference numeral 72 denotes a left and right engaging body, which is connected to the vehicle side holding body 56.
It is rotatably provided on both left and right sides by support shafts 73 in the left and right direction. As shown in Figure 17,
Each engaging body 72 has a central roller 74 located at the center in the axial direction and hardened by quenching, and a pair of left and right truncated conical side rollers 75 located on both left and right sides of the central roller 74 .

In addition, after the joint parts 53 and 54 on the vehicle side and the loader side are disconnected, the vehicle side joint part 53 and the guide pin 7
1. Depending on the weight balance of the hydraulic hose 70, etc.
The vehicle-side holding body 56 maintains a vertical position, and the vehicle-side joint portion 53 maintains a horizontal position.

On the other hand, the loader side joint portion 54 is provided in the loader 23 as follows.

As shown in FIGS. 8 to 11, reference numeral 77 is a swing arm, and its lower end is attached to the mounting member 24 with a support shaft 3.
1 so that it can swing back and forth.

Reference numeral 78 denotes a guide, one end of which is attached to the front lower part of the mounting member 24 with a support shaft 79, a nut 80, and a collar 8.
It is pivotally supported via the first and second parts so that it can freely swing up and down. A guide groove 82 is formed in the guide 78 in the longitudinal direction.

At the bottom of the swing arm 77, a pin 83 is inserted into the guide groove 82 so as to be movable in the longitudinal direction.
is fixedly provided, and the swinging range of the swinging arm 77 is regulated by this guide groove 82. 84
is Washiya, and 85 is Natsuto.

1 to 4, as shown in FIG. 13,
Reference numeral 86 denotes a loader side holder, and a small side plate 87 that projects rearward and a pair of left and right large side plates 88 that protrude more rearward than the small side plate 87 are fixedly provided at the lower part of the loader side holding body. The upper end of the swing arm 77 is pivotally connected between the rear ends of both large side plates 88 by a support shaft 89 .

A bracket 90 is fixed to the front surface of the upper part of the swing arm 77, and a piece 91 is provided on the bracket 90 so as to be rotatable about an axis in the left and right direction.

92 is a rod whose lower part is inserted through the piece body 91 so as to be freely movable in the axial direction, and whose upper end is pivotally connected between the small side plate 87 and one large side plate 88.

A pair of spring receivers 94 are fitted into the rod 92 and abut on the bridge body 91 and the pin 93, respectively, and a spring 95 is interposed between these spring receivers 94 in a resilient manner.
The pin 93 is removably inserted into one of the plurality of pin holes 96 of the rod 92.

That is, in the illustrated example, the work machine side holding body 86 is provided on the upper end side of the swing arm 77 so as to be swingable in the vertical direction by a support shaft 89, and the work machine side joint part 54 is connected to the vehicle side joint part 53 in the longitudinal direction. The work machine side holder 86 is supported by a swinging arm 77 on the work machine side with elastic support means including a rod 92, a spring 95, and the like.

The loader side holding body 86 includes a pair of upper and lower parts and a holder 97.
are inserted into each holder 97, and a pair of left and right loader-side joint portions 54 are inserted into each holder 97, respectively.

As shown in FIGS. 14 and 15, the loader side joint portion 54 includes a housing 98 inserted into a holder 97, a main body 99 inserted into the housing 98 so as to be movable in the axial direction, and a main body 99. Steel balls 100 equally distributed in the circumferential direction at the tip and a housing 98
a spring 101 that is interposed between the main body 99 in a resilient manner and acts as a resistance to the movement of the main body 99; a guide 102 that is built into the main body 99 and has an oil passage between the main body 99 and the like; A poppet 104 is inserted movably in the axial direction and has a seal ring 103, a guide 102, and a poppet 104.
A spring 105 and the like are interposed in a spring-like manner in between.

A base-side circumferential groove 106 and a distal-side circumferential groove 107, into which the steel ball 100 can be engaged and detached, are formed on the inner circumferential surface of the housing 98 on the base side and the distal side of the steel ball 100.

A hydraulic hose 108 is detachably connected to the main body 99. Then, inside the tip of the main body 99,
When the housing 60 of the vehicle side joint section 53 is inserted and comes out, the steel balls 100 of the loader side joint section 54 engage with the circumferential groove 65 of the housing 60, and the balls 62 of the vehicle side joint section 53 and the loader side joint section 54 engage with each other. The poppets 104 of the two joints 53 and 54 are in communication with each other by pressing the other side.

A 16th
As shown in the figure, a pair of left and right guide tubes 109 into which the guide pins 71 are inserted and removed are fixedly installed, and the inlet side of the guide tubes 109 has a tapered arc shape as shown in FIG. pin 71
It is said that it is easy to insert.

Reference numeral 110 denotes a left-right integrated plate-shaped cam body, which is connected by a U-shaped operation lever 111 and rotatably provided on both left and right sides of the loader-side holding body 86 via a support shaft 112 and a collar 113. is fixed to the loader side holder 86.

The cam body 110 has a curved tip side protrusion 11.
4 and a base side protrusion 115 are formed to face each other.

The inner circumferential surface of the tip side protruding portion 114 is a curved concave connecting cam portion 116, which engages and disengages from the engaging body 72 by rotating the cam body 110 when the loader 23 is connected to the vehicle 1. By freely engaging and bringing the loader-side holder 86 closer to the vehicle-side holder 56, both the vehicle-side and rotor-side joints 53 and 54 are releasably connected. Note that an engagement recess 117 is formed at the rear end of the coupling cam portion 116 to which the engagement body 72 is detachably engaged.

The outer peripheral surface of the base side protrusion 115 is a release cam portion 118 having a curved protrusion shape, and when the loader 23 is removed from the vehicle 1, the cam body 110 rotates to engage and disengage from the engagement body 72. By engaging and retracting the loader-side holding body 86 from the vehicle-side holding body 56, the connection between the joint portions 53 and 54 on the vehicle side and the loader side is released.

Here, by adjusting the elastic force of the spring 95 which is the elastic support means, both the joint parts 53 on the vehicle side and the loader side,
54, regardless of the swinging position of the swinging arm 77, the loader side joint 54 and the hydraulic hose 1
08 etc. and the volatile force of the spring 95 are balanced, the loader-side holder 86 maintains a vertical posture, and the loader-side joint portion 54 maintains a horizontal posture and faces the vehicle-side joint portion 53 in the longitudinal direction. ing.

Reference numeral 119 denotes an oil receiver, which is provided at the lower rear surface of the loader side holding body 86 and is connected to both the vehicle side and loader side joint parts 5.
When the joints 3 and 54 are uncoupled, the hydraulic oil leaked from both the joints 53 and 54 is received.

According to the embodiment configured as described above, the vehicle 1
When the loader 23 is connected to the loader 23, as shown in FIG. 6, the lift cylinder 32 is in an extended state, the mounting member 24 is tilted backward, and the locked stand 39 and bucket belt 35 are in contact with the ground. ing.

Also, the swinging arm 77 is located at the frontmost swinging position,
Further, as shown in FIG. 1, the cam body 110 is in a rotational position where the release cam portion 118 is located on the front side.

In the above state, the vehicle 1 is moved backwards and the loader 23
As shown in FIG. 2, the cam body 110
The release cam part 118 of the cam part 118 faces or contacts the engaging body 72 with a small gap, and the guide cylinder 109 of the loader-side holder 86 is fitted onto the guide pin 71 of the vehicle-side holder 56. , the two holding bodies 56 and 86 are positioned relative to each other, and the main body 99 of the loader-side joint portion 54 is externally fitted onto the distal end portion of the housing 60 of the vehicle-side joint portion 53 .

Note that when the guide tube 99 is externally fitted onto the guide pin 71, the swing arm 77 is caused to swing slightly rearward.

Moreover, in the above case, both the holding bodies 56, 86
The vertical positional deviation is due to the swinging of the swinging arm 77, the vertical swinging due to the rotation of the loader-side holder 86 around the support shaft 89, and the bolt 5 of the vehicle-side holder 56.
It is absorbed by the rotation around 7 and both joints 53, 54
The alignment is done.

Further, the work machine side holding body 86 is elastically supported on the work machine side by elastic support means 92 and 95, and even though it is vertically rotatable, both joint parts 53 and 54 are held so as to face each other in the front and rear.

Then, the operating lever 111 is rotated forward to rotate the cam body 110, and the connecting cam portion 116 is engaged with the central roller 74 of the engaging body 72, thereby connecting the central roller 74. The cam portion 116 is rolled and once engaged with the engagement recess 117 as shown in FIG.

As a result, the loader-side holding body 86 approaches the vehicle-side holding body 56, and the main body 99 of the loader-side joint portion 54
moves further forward and removes the housing 6 of the vehicle side joint part 53.
However, when the stepped part 64 of the housing 60 and the steel ball 100 of the loader side joint part 54 come into contact, the forward movement of the main body 99 stops, and only the housing 98 of the loader side joint part 54 It moves forward together with the loader-side holding body 86 and is fitted onto the housing 60 of the vehicle-side joint portion 53 .

Then, the housing 98 of the loader side joint portion 54
Due to the relative movement between the housing 9 and the main body 99,
When the base side circumferential groove 106 of No. 8 reaches the position corresponding to the steel ball 100, the steel ball 100 is inserted into the base side circumferential groove 10.
6, the engagement between the stepped portion 64 of the vehicle-side joint portion 53 and the steel ball 100 is released.

As a result, the main body 99 is moved forward by the spring 101 and attempts to return to its original position relative to the housing 98, and the housing 98 itself also moves forward together with the loader-side holder 86.

As a result, the steel balls 10 of the loader side joint portion 54
0 crosses over the stepped portion 64 of the housing 60 of the vehicle-side joint portion 53 and comes to a position corresponding to the circumferential groove 65, but at this time, the steel ball 100 crosses the base-side circumferential groove 106 of the loader-side joint portion 54. They are in corresponding positions.

In addition, in the above case, the poppet 104 of the loader side joint part 54 and the ball 62 of the vehicle side joint part 53 press against each other, and the gap between the seal ring 103 of the poppet 104 and the seat surface of the main body 99 is At the same time, the ball 62 and the seat surface of the housing 60 are opened, and both the joint parts 53 and 54 are brought into communication.

Then, the operating lever 111 is slightly rotated to the rear side, the cam body 110 is rotated, and the engaging body 72 is disengaged from the engaging recess 117 as shown in FIG. The holding body 86 is attached to the vehicle side holding body 5.
It is possible to retreat from 6.

As a result, the spring 101 of the loader side joint portion 54
Due to the pressure of
06 retreats from the steel ball 100, the steel ball 100 is located between the base side circumferential groove 106 and the tip side circumferential groove 107, and is securely engaged with the circumferential groove 65 of the housing 60 of the vehicle side joint part 53. .

By the way, when the two joint parts 53 and 54 are connected, even if there is a vertical or horizontal positional shift between the two, the vehicle side joint part 53 is provided on the vehicle side holder 56 so as to be movable vertically and horizontally. Therefore, the above-mentioned positional deviation is absorbed by this movement.

By the way, as described above, when the vehicle 1 is brought close to the loader 23 in order to connect the vehicle side hand portion 53 and the loader side joint portion 54, the engaging portion 40 of the mounting member 24 of the loader 23 is Connection bracket 15
It is located above the connecting pin 16 of.

Therefore, in the above state, the mounting member 2 of the loader 23
4 to the vehicle 1, the lift cylinder 32 is contracted by operating the lift cylinder control valve 49, and the mounting member 24 is rotated forward.
The engaging portion 40 of the mounting member 24 is engaged with the connecting pin 16.

Then, when the lift cylinder 32 is further reduced, the mounting member 24 rotates forward, the stand 39 rises from the ground, and the connecting pin 41 of the mounting member 24 comes into contact with the cam part 21 of the retainer 19. While lifting the retainer 19, lower the upper connecting bracket 17.
After the engagement, the retaining body 1 is engaged with the connecting recess 18 of the
9 is lowered by the spring, and the connecting pin 41 is prevented from coming out from the connecting recess 18.

By the way, in the above case, the mounting member 24 rotates forward, but the swing arm 77 swings relatively backward around the support shaft 31, and the loader-side holder 86 rotates around the support shaft 89. The loader-side holder 86 is held at a fixed position by rotating downward relative to the periphery of the vehicle, and both the vehicle-side and loader-side joint portions 53,
This will not affect the connection of 54.

Then, from the above state, the lower link 10 is raised by the hydraulic device 4 for lifting and lowering the working machine, and as shown in FIG.
4 is engaged with the mounting member 24, the mounting member 24 is securely fixed to the vehicle body 2, and the loader 23
The connection work to vehicle 1 is completed.

Next, when removing the loader 23 from the vehicle 1,
The procedure is the reverse of the above. First,
The lower link 10 is lowered by the hydraulic device 4 for lifting and lowering the work machine, and the contact plate 13 of the connecting body 12 and the protrusion 1 are connected to each other.
4 is separated from the mounting member 24 of the loader 23.

Next, the retaining body 19 is raised by its operating mechanism to open the connecting recess 18 of the upper connecting bracket 17 to the rear.

After that, when the lift cylinder 32 is extended,
While the mounting member 24 rotates rearward, the locked stand 39 touches the ground, and the connecting pin 41 of the mounting member 24 separates from the connecting recess 18 of the upper connecting bracket 17.

Then, when the lift cylinder 32 is further extended, the mounting member 24 further rotates rearward, and the connecting pin 16 is relatively disengaged from the engagement portion 40 of the mounting member 24.

Next, both the joint parts 53 and 54 on the vehicle side and the loader side
The connection is released as follows. At this time, the swing arm 77 is in a position where it swings forward.

That is, first, each shutoff cock 52 is closed, and the lift cylinder control valve 49 and the bucket cylinder control valve 50 are operated to release the pressure in the hydraulic system on the loader side.

This is to ensure that the attitude of the loader 23 does not change even if the loader 23 is left unattended for a long time after being removed from the vehicle 1, and also to ensure that both joints 53 and 54 on the vehicle and loader side are lightly tightened during the next connection work. This is to enable connection by force.

Then, the operating lever 111 is largely rotated to the rear, the cam body 110 is rotated, and the releasing cam portion 118 is moved toward the center roller 7 of the engaging body 72.
4 to cause the central roller 74 to roll to the end of the release cam portion 118, as shown in FIG.

As a result, the loader-side holder 86 retreats from the vehicle-side holder 56, and the housing 98 of the loader-side joint portion 54 also retreats together with the loader-side holder 86.

However, since the steel balls 100 of the loader side joint part 54 are engaged with the circumferential groove 65 of the housing 60 of the vehicle side joint part 53, the main body 9 of the loader side joint part 54
9. Remain in position without retreating.

Then, the housing 98 of the loader side joint portion 54
Due to the retreat of the housing 98, the distal end side circumferential groove 1
07 and the steel ball 100 are in corresponding positions, the steel ball 100 can be engaged with the tip side circumferential groove 107, and the steel ball 100 can be detached from the circumferential groove 65 of the housing 60 of the vehicle side joint part 53. becomes.

As a result, the engagement between the main body 99 of the loader side joint part 54 and the housing 60 of the vehicle side joint part 53 is released, the main body 99 moves backward together with the housing 98 of the loader side joint part 54, and the steel ball 100 moves toward the vehicle side. When the joint part 53 moves back beyond the circumferential groove 65 and stepped part 64 of the housing 60, the main body 99 of the loader side joint part 54 returns to its original position with respect to the housing 98 due to the elastic force of the spring 101, and the steel ball 100 is located between both circumferential grooves 106 and 107 of the housing 98. Further, the loader side joint part 54 unites and retreats together with the loader side holding body 86, so that the pressure between the ball 62 of the vehicle side joint part 53 and the poppet 104 of the loader side joint part 54 is mutually released. As a result, the space between the ball 62 and the seat surface of the housing 60 is closed, and the space between the seal ring 103 of the poppet 104 and the seat surface of the main body 99 is closed, so that the joints 53 and 54 on the vehicle side and the loader side are in communication. is cut off, and the connection between the two is released.

Also, when this connection is released, both the joint parts 53, 5
Hydraulic oil leaking from 4 is caught by oil pan 119 and does not contaminate vehicle 1, loader 23, etc.

In the manner described above, the separation work between the loader 23 and the vehicle 1 is completed.

Note that the work machine side holding body 86 is not supported by the swing arm 77 but by a bracket fixed to the mounting member 24 or protruding from the member 24, so that it can swing freely in the vertical direction and is elastically supported by elastic support means 92 and 95. It can be something.

(Effects of the Invention) As described in detail above, according to the present invention, the work machine side joint part and the vehicle side joint part are opposed to each other in the front and back, and the work machine side holding body is made swingable in the vertical direction. This makes it easy to align both joints, and unlike conventional methods, you can hold each joint on the work equipment side with your hand, align it with the corresponding joint on the vehicle side, and connect or separate it. Therefore, it is easy to connect and separate the two joints, and the hands do not get dirty immediately after the connection and separation work.

Furthermore, even if the work machine-side holder is made vertically swingable, it is held in a desired posture by the elastic support means, so that the relationship between the two joints in the front-rear direction is unlikely to collapse.

The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and each of FIGS. 1 to 4 is a side view of the main part showing different operating states, and each of FIGS. 5 and 6 is a side view of the main part showing different operating states. 7 is a hydraulic circuit diagram, FIG. 8 is a side view of the swing arm, etc., FIG. 9 is a sectional view taken along the line A-A in FIG. 8, and FIG. 8 is a sectional view taken along the line B in FIG. 8, FIG. 11 is a sectional view taken along the line C-C in FIG.
- D line, E-E line arrow views, Figures 14 and 15
Each figure in the figure is a longitudinal sectional view of both the loader side and vehicle side joint parts showing different operating states, Fig. 16 is a longitudinal sectional view showing the guide pin and guide tube, and Fig. 17 is a sectional view of the engaging body. be. 1...Vehicle, 23...Loader (work machine), 53,
54...Vehicle side/loader side (work machine side) joint part,
56, 86... Vehicle side/loader side (work machine side) holding body, 72... Engaging body, 92, 95... Elastic support means, 110... Cam body, 112... Support shaft, 11
6,118...Cam part for connection/release.

Claims (1)

[Scope of Claims] 1. When the work machine 23 is attached to or detached from the vehicle 1, the vehicle side joint part 53 and the work machine side joint part 54 are attached and detached in the hydraulic oil supply system from the vehicle 1 to the work machine 23, and both joints are connected to each other. The parts 53 and 54 constitute a self-sealing type joint 51, in which the vehicle side joint part 53 is connected to the vehicle 1 by the vehicle side holding body 56.
The work machine side joint part 54 is provided on the work machine side holding body 86, and the work machine side holding body 86 is provided on the work machine side so as to be swingable in the vertical direction. Elastic support means 92 and 95 are provided for resiliently supporting the work machine side holding body 86 to the work machine side while facing the vehicle joint part 53 in the front and rear direction,
By bringing the work machine side holding body 86 closer to the vehicle side holding body 56, both the joint parts 53 on the vehicle side and the work machine side,
54. A coupling device in a hydraulic oil supply system to a working machine, characterized in that 54 is connected.