JP2003020675A - Connection device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection device for a working machine preventing interference of a wedge member with a step equally to a conventional one even when a receiving part in the lower part is positioned behind a connection pin in the upper part. SOLUTION: This connection device for a working machine installed to the rear part of a tractor freely removably is provided with the receiving part 39 arranged in the rear part on the tractor side and opened upward, the connection pin 40 arranged on the upper side of the receiving part 39, a connection bar 41 arranged on the working machine 3 side to be fitted in the receiving part 39 freely removably from the upper side, a pair of upper and lower mount holders 43, and the wedge member 44 inserted freely removably from the rear side between the mount holders 43 arranged behind a pivot part 42 for locking rotation of the mount holders 43. The connection pin 40 is arranged in front of the receiving part 39, a pair of upper and lower mount holders 43 are formed asymmetrically, and the wedge member 44 is arranged slantingly so that its rear end is directed downward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling device for a working machine mounted on a tractor or the like.

[0002]

2. Description of the Related Art As a connecting device of this type, for example, one disclosed in Japanese Patent Laid-Open No. 2000-273901 is known. This conventional type is a so-called TLB in which a front loader is attached to the front part of the tractor and a backhoe is attached to the rear part.
This is called a (tractor loader backhoe), and is a connecting device for a working machine (backhoe) that is detachably attached to the rear part of the tractor, and is an upper part below the rear part of the tractor side and on both left and right sides. A receiving part of the opening, a connecting pin provided on the upper side of the receiving part, a connecting bar provided on the working machine side to be removably fitted into the receiving part from above, and the connecting pin is approached from the rear side. And a pair of upper and lower mount holders provided rotatably in the vertical direction via a pivotal support so that the front can be opened and closed so as to be detachably fitted to the connecting pin from the radial direction of the connecting pin. A wedge member that is removably inserted from the rear between the pivot holder and a mount holder that locks the rotation of the holder is provided.

In this conventional working machine coupling device, since the lower receiving portion on the tractor side is located in front of the PTO shaft, the working machine side is designed so as not to collide with the PTO shaft when the working machine is attached or detached. Was there.

[0004]

However, the above-mentioned prior arts have not completely prevented the working machine from accidentally colliding with the PTO shaft when the working machine is attached or detached. Therefore, it has been considered to prevent the accidental collision of the working machine by locating the lower receiving portion on the tractor side behind the PTO shaft. However, in order to position the receiving part rearward of the PTO axis, if the positional relationship of the receiving part and the connecting pin is left unchanged and the position is changed rearward as a whole, the overall arrangement of the working machine is rearward. As a result, the total length of the TLB becomes long, the weight balance becomes unbalanced, and the TLB becomes compact.

Further, when the working machine is entirely rearwardly relocated, the lower surface of the rear end of the working machine is separated from the rear wheel of the tractor by a large amount, and the starting angle (when working on a flat road toward an uphill road) The angle of the slope at which the lower surface of the rear end of the machine comes into contact with a flat road surface becomes small, and when the TLB is loaded onto the truck bed, the rear end of the working machine comes into contact with the ground, making it difficult to load. Therefore, instead of shifting the entire coupling device rearward, it has been considered that only the lower receiving portion is moved rearward from the rear end of the PTO shaft.

However, when only the lower receiving portion is shifted rearward, the upper connecting pin is located in front of the receiving portion, and the rear end of the wedge member on the working machine side is inclined upward. , Will occupy a high position. This is because, since the lid and the pair of upper and lower mount holders are formed symmetrically, it is necessary to arrange the wedge member in the direction orthogonal to the line connecting the connecting bar and the mount holder. Although the step of the working machine is arranged above the wedge member, if the rear end of the wedge member is located at a high position, the wedge member may collide with the step.

In view of the above, the present invention provides a connecting device for a working machine, which prevents the wedge member from interfering with the step, as in the conventional case, even when the lower receiving portion is located rearward of the upper connecting pin. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention has taken the following means. That is, a feature of the present invention is a coupling device for a working machine that is detachably attached to a rear portion of a tractor, and has a receiving portion of an upper opening provided below the rear portion of the tractor side and on both left and right sides. A connecting pin provided on the upper side of the receiving portion, a connecting bar provided on the working machine side and removably fitted into the receiving portion from above, and the connecting pin approaching the connecting pin from the rear side And a pair of upper and lower mount holders that are vertically rotatable via pivotal support portions so that the front can be opened and closed so as to be removably fitted to the connecting pin from the radial outer direction, and a rear portion from the pivotal support portions. And a wedge member that is insertably and detachably inserted from the rear between the mount holders and locks the rotation of the mount holders, the connecting pin is provided in front of the receiving portion, A pair of upper and lower mount holders , Is formed asymmetrically, the wedge member is in that its rear end is inclined arranged to face downward.

By forming the pair of upper and lower mount holders asymmetrically, the wedge member can be arranged in an inclined shape so that its rear end faces downward. Even if the step is provided above the wedge member by such an arrangement, the wedge member and the step do not interfere with each other. The rear end surface of the mount holder is
When the front surface of the mount holder is pivoted toward the expansion method, the rear end surfaces of the pair of upper and lower mount holders are the concentric circumferential surfaces of the mount holder. It is preferably configured to contact the tip.

According to this structure, when the work machine is attached and detached, the wedge member that is in contact with the mount holder moves in the vertical direction even if the mount holder rotates due to the contact between the mount holder and the connecting pin. It does not shake. It is preferable that the PTO shaft projects rearward from the rear end of the tractor, and the receiving portion is located rearward of the rear end of the PTO shaft. With such an arrangement structure, the work machine is prevented from accidentally colliding with the PTO shaft when the work machine is attached or detached.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 shows a TLB (tractor / front loader / backhoe), which is a tractor 1
And a front loader 2 mounted on the front of the tractor 1.
And a backhoe 3 attached to the rear of the tractor 1. A midmount mower 4 is attached to the lower abdomen of the tractor 1. Backhoe 3 to tractor 1
The device for detachably mounting on the backhoe 3 is the connection device 5 of the working machine according to the present invention, but the connection device 5 is not limited to the backhoe 3 and is not limited to the backhoe 3. Other work machines may be connected.

The tractor 1 is a so-called frame type tractor, and has a body frame 6 which is long in the front-rear direction, and an engine 7 and a transmission case 8 are attached to the body frame 6 so as to be separated from each other in the front-rear direction. The engine 7 and the mission case 8 are connected by a power transmission shaft. A front axle case supporting front wheels 9 is supported on the front portion of the vehicle body frame 6, and the front axle case and the mission case 8 are supported.
The front and rear wheels are connected by a drive shaft. A rear axle case that supports the rear wheel 10 projects from the mission case 8 to the left and right. The PTO shaft 11 projects rearward from the rear end surface of the mission case 8.

A hydraulic device for raising and lowering the working machine is attached to the upper part of the transmission case 8, and a driver's seat 12 is arranged above the hydraulic device, and the driver's seat 12 is configured to be reversible in the front-rear direction. The engine 7 is covered with a bonnet, and a tractor control section 13 having a steering handle and the like is provided at the rear of the bonnet. A floor seat is provided from below the driver's seat 12 to the control unit 13, and fenders 14 for the rear wheels are attached to the left and right side portions of the floor seat.

As shown in FIGS. 2 and 3, the vehicle body frame 6 is composed of a pair of left and right plate members formed long in the front-rear direction.
The left and right body frames 6 are connected and fixed by a plurality of front and rear lateral members 15, 16. The length of the lateral member 16 near the mission case 8 is adjustable. A mast support frame 17 is provided on a side surface of the vehicle body frame 6 in the front-rear direction.
However, it is fixed so as to project outward. The mast support frame 17 and the rear portion of the vehicle body frame 6 are connected by a reinforcing frame 18. The reinforcing frame 18 is superposed on the vehicle body frame 6 in a side view.

At the rear ends of the left and right body frames 6, a rear connecting frame 19 is attached in a vertically protruding manner.
The lower end of the pair of left and right rear connection frames 19 has the horizontal member 2
The length is freely adjustable at 0. Rear connection frame 1
The upper part of 9 is connected to the hydraulic device and is also connected to the vehicle body frame 6 by a reinforcing frame 21 extending forward. The LOPS mounting frame 22 is fixed to the upper end of the rear connecting frame 19 in a laterally protruding manner, and the LOPS 23 is attached to the LOPS mounting frame 22. The lops 23 protect the worker in the driver's seat 12.

The rear connecting frame 19 is provided with a top link at the upper part thereof so that the backhoe 3, the front loader 2 and the mid mount mower 4 can be detached and a rotary tiller, a wagon or the like as a rear working machine can be mounted. The bracket is equipped with left and right lower link pins at the bottom, and the hitch connector is also provided at the bottom. The front loader 2 pivotally supports a base of a boom 25 above and below the left and right masts 24 so that the boom 25 can swing up and down.
The boom 25 can be hydraulically driven by the boom cylinder, and the bucket 26 can be hydraulically driven by the bucket cylinder.

The mast 24 is the mast support frame 1
The mast support member 7 is fitted into the mast support member from the upper side and locked by a lock pin. The mid mount mower 4 is attached to the lower part of the abdomen of the tractor via suspension means so as to be able to move up and down, and the power is transmitted from the transmission case 8 to rotate the blade. As shown in FIGS. 4 and 5, the backhoe 3 includes a base frame 27 and a pair of left and right mounting bodies 28 fixed to the front side of the base frame 27. Base frame 27
A swing bracket 29 is pivotally supported on the rear part of the base frame 27 so as to be swingable about a vertical axis, a step 30 is arranged on the upper part of the base frame 27, and a backhoe control part 30a is mounted on the step 30. Is equipped with a hydraulically driven outrigger 31.

The swing bracket 29 is swingable right and left by a single swing cylinder 32 provided on the base frame 27. This swing bracket 29
The base of the boom 33 is pivotally supported about the horizontal axis, and the boom 33 is vertically swingable by a boom cylinder 34 provided between the swing bracket 29 and the boom 33. An arm 35 is pivotally supported at the tip of the boom 33, and an arm cylinder 36 provided between the boom 33 and the arm 35 allows the arm 35 to swing up and down. A bucket 37 (see FIG. 1) is pivotally supported at the tip of the arm 35, and a bucket cylinder 38 (see FIG. 1) provided between the bucket 37 and the arm 35 allows the bucket 37 to move.
Is capable of scooping and dumping.

A connecting device 5 for the working machine is constructed between the rear connecting frame 19 and the mounting body 28 of the backhoe 3. As shown in FIGS. 6 and 7, the coupling device 5 is provided on the upper opening of the rear coupling frame 19 and the upper opening receiving portions 39 respectively provided on the lower ends of the left and right rear coupling frames 19 on the tractor 1 side. And the receiving portion 39 provided on the attachment body 28 on the backhoe 3 side.
And a connecting bar 41 that is fitted into the connecting pin 40 from above, and the front side can be opened and closed so as to approach the connecting pin 40 from the rear side and detachably fit to the connecting pin 40 from the radial direction of the connecting pin 40. And a pair of upper and lower mount holders 43 rotatably provided in the vertical direction via the pivotal support portion 42 and a mount holder 43 rearward of the pivotal support portion 42 so as to be insertable and removable from the rear. And a wedge member 44 for locking the rotation of the holder 43.

The receiving portion 39 is located rearward of the rear end of the PTO shaft 11, the connecting pin 40 is provided in front of the receiving portion 39, and the pair of upper and lower mount holders 43 are asymmetrical. The wedge member 44 is inclined so that its rear end faces downward. And
The step 30 is arranged above the wedge member 44. The connecting pin 40 has a left-right axis, and a pair of left and right side plates 45 fixed to the side surface of the rear connecting frame 19.
(See FIG. 5).

A cutout portion 46 which is recessed forward is formed on the rear end surface of the lower portion of the left and right rear connecting frames 19. A receiving member 47 is fixed to the side surface of the rear connecting frame 19 at the position of the cutout portion 46, and the receiving portion 39 is formed on the receiving member 47. In the present embodiment, the receiving portion 39 is composed of an upwardly open arcuate concave portion. An upper step portion of the cutout portion 46 serves as a restriction portion 48 that restricts upward movement of the connecting bar 41 on the backhoe 3 side that is fitted into the receiving portion 39, and faces the receiving portion 39 from above.

The receiving portion 39 of the receiving member 47 is located behind the rear end of the PTO shaft 11 in the front-back direction, below the PTO shaft 11 in the vertical direction, and on the left and right sides of the PTO shaft 11 in the left-right direction. Located on both sides. on the other hand,
The connecting bar 41 on the backhoe 3 side has an axial center in the left-right direction and is fixed over the lower portions of the left and right mounting bodies 28. The outer diameter of the connecting bar 41 is sized to fit in the arcuate recess of the receiving portion 39. The tip portion of the mounting body 28 near the connecting bar 41 has the receiving portion 39.
It is expanded outward so that it can be easily fitted to.

The pair of upper and lower mount holders 43 are rotatably attached to the upper and lower pivotal support portions 42 fixed to the outer surface of the mounting body 28 so as to have a horizontal axis. An arcuate recess 49 is formed on the opposing surfaces of the pair of mount holders 43 in front of the pivot portion 42 so as to be fitted to the connecting pin 40 from the radially outer side. The mount holder 43
A biasing means 50 for biasing the front portions of the pair of mount holders 43 in the expansion direction is provided between the pair of upper and lower mantle holders 43 at the rear of the pivot support portion 42. The biasing means 50 is composed of a tension spring.

The wedge member 44 has a rod portion 52 slidably held in a bracket 51 provided on the mounting body 28 in the front-rear direction, and a head portion 53 provided at a front end portion of the rod portion 52. The compression spring 54 is interposed in the rod portion 52 between the head portion 53 and the bracket 51,
The head portion 53 is always biased forward. Mounting body 28
A lock release lever 55 is rotatably supported on the lever 55, and a pin 57 provided on the head portion 53 is engaged with an elongated hole 56 provided on the lever 55. By rotating the lock release lever 53 in the front-back direction, the wedge member 44
Is movable in the front-back direction.

The head portion 53 is provided so that it can be inserted between the mount holders 43 from the rear in order to maintain the closed state when the front portions of the pair of mount holders 43 are closed. The wedge member 44 is arranged in an inclined shape so that the rear portion of the rod portion 52 is located below. Therefore, the pair of upper and lower cloak holders 43
Are formed asymmetrically. The mount holder 43
The rear end surface is a circumferential surface 58 concentric with the pivotal support portion 42 of the mount holder 43, and when the front portion of the mount holder 43 is expanded from the pivotal support portion 42, the circumferential surface 58 is simultaneously described above. The wedge member 44 is configured to come into contact with the head portion 53 at the tip end portion.

Above the wedge member 44, the step 30 of the backhoe 3 is arranged. The lower surface of the step 30 and the wedge member 44 are configured not to interfere with each other. The operation of mounting the backhoe 3 on the tractor 1 with the above-described structure will be described. When the backhoe 3 is detached from the tractor 1, the mount holder 43 is operated by the urging means 5.
The head portion 53 of the wedge member 44 is in contact with the circumferential surface 58 on the rear surface of the mount holder 43 before the backhoe 3 is mounted on the tractor 1. Backhoe 3 has left and right outriggers 31
And the bucket 37 are held in a grounded state.

To mount the backhoe 3 on the tractor 1, the tractor 1 is moved backward so that the receiving portion 39 is located below the connecting bar 41 (note that the connecting bar 41 is not shown).
If the position of is not suitable for joining work, outrigger 3
1, by operating the boom 33 and the like, the connecting bar 4
1 is located above the receiving portion 39). Next, the outrigger 31 is raised and the backhoe 3 is lowered, and the connecting bar 41 is fitted into the receiving portion 39 from above. At this time,
The connecting pin 40 is located in front of the mount holder 43.

Next, the arm cylinder 36 or the bucket cylinder 38 is operated to rotate the base frame 27 of the backhoe 3 and the mounting body 28 and the like around the connecting bar 41 to the front side to move the mount holder 43 to the tractor 1 side. Close to. Then, the connecting pin 40 is inserted and arranged between the mount holders 43, and the rear end of the arcuate recess 49 is pressed by the male connecting pin 40, so that the mount holder 43 is closed against the biasing means 50. Then, the connecting pin 40 is sandwiched between the pair of mount holders 43.

At this time, the rear end side of the mount holder 43 expands as the mount holder 43 closes. At this time, the wedge member 44 moves the circumferential surface 58 of the mount holder 43.
Since the mount member 43 rotates, the position of the wedge member 44 does not change even if the mount holder 43 rotates. Then, when the rear portion of the mount holder 44 expands, the wedge member 44 is inserted between the rear ends of the mount holder 43 by the biasing force of the spring 54, and the opening operation of the mount holder 43 by the biasing means 50 is blocked. As a result, the backhoe 3 is attached to the tractor 1.

To release the backhoe 3 from the mounted state, the lock release lever 55 is operated to move the wedge member 44.
When is retracted to the rear of the mount holder 43, the mount holder 43 is expanded by the urging means 50. In this state, the reverse operation is performed. That is, first, the arm cylinder 36 or the bucket cylinder 38 is operated to rotate the base frame 27 and the mounting body 28 of the backhoe 3 rearward around the connecting bar 41 to move the mount holder 43 away from the tractor 1 side. .

Then, the connecting pin 40 is separated from the mount holder 43. Next, the outrigger 31 is lowered to raise the backhoe 3, and the connecting bar 72 is received by the receiving portion 69.
From above. Then, the tractor 1 is advanced. According to the above-mentioned structure, since the wedge member 44 and the step 30 do not interfere with each other, the step 30 can be formed wide, so that a sufficient space for getting on and off can be secured. Also,
Although the rear end of the backhoe 3 can be positioned at the same position as the conventional one, even though the receiving portion 39 is displaced rearward from the PTO shaft 11, a large starting angle α (see FIG. 4) can be obtained. , It does not hinder loading on the truck bed.

The present invention is not limited to the one shown in the above embodiment.

[0033]

According to the present invention, even if the lower receiving portion is located rearward of the upper connecting pin, the wedge member can be prevented from interfering with the step as in the conventional case.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a plan view showing a structure of a frame.

FIG. 3 is an exploded side view of the frame.

FIG. 4 is a side view of essential parts showing an embodiment of the present invention.

FIG. 5 is a main part plan view showing an embodiment of the present invention.

FIG. 6 is a side view of the coupling device of the present invention before coupling.

FIG. 7 is a side view of the coupling device of the present invention after coupling.

[Explanation of symbols]

1 tractor 3 working machines (backhoe) 11 PTO axis 30 steps 39 Receiver 40 connecting pin 41 connecting bar 42 pivotal branch 43 mount holder 44 Wedge member

Claims (4)

[Claims] 1. A coupling device for a working machine detachably mounted on a rear portion of a tractor, the receiving portion being an upper opening provided below the rear portion of the tractor side and on both left and right sides, and above the receiving portion. Side, a connecting bar provided on the working machine side and fitted into the receiving portion so as to be able to be inserted into and removed from the receiving portion from above, and the connecting pin is approached from the rear from the rear side from the radial direction of the connecting pin. Between a pair of upper and lower mount holders that are vertically rotatable through a pivot so that the front can be opened and closed so as to be detachably fitted to the connecting pin, and between the mount holder at the rear of the pivot. And a wedge member that is insertably / removably inserted from the rear to lock the rotation of the mount holder, wherein the connecting pin is provided in front of the receiving portion,
The pair of upper and lower mount holders are asymmetrically formed,
The connecting device for a working machine, wherein the wedge member is arranged so that its rear end faces downward. 2. The connecting device for a working machine according to claim 1, wherein a step of the working machine is arranged above the wedge member. 3. A rear end surface of the mount holder is a circumferential surface concentric with a pivotal support portion of the mount holder, and when a front portion of the mount holder pivots in a spreading direction. The connecting device for a working machine according to claim 1 or 2, wherein the rear end surfaces of the pair of upper and lower mount holders are configured to come into contact with the front end portions of the wedge members. 4. The PTO shaft projects rearward from the rear end of the tractor, and the receiving part is located rearward of the rear end of the PTO shaft. The working machine coupling device according to any one of 1.