JP3706315B2 - Working machine connection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection device for a working machine mounted on a tractor or the like.
[0002]
[Prior art]
As this type of coupling device, for example, the one described in JP 2000-273901 A is known.
This conventional type is a so-called TLB (tractor / loader / backhoe) in which a front loader is attached to the front part of the tractor and a backhoe is attached to the rear part. The work is detachably attached to the rear part of the tractor. This is a connecting device for a machine (backhoe), which is provided on the working machine side with a receiving part of an upper opening provided on the left and right sides below the rear part on the tractor side, a connecting pin provided on the upper side of the receiving part And a connecting bar that fits in and out of the receiving portion from above, and the front opens and closes so that the connecting pin approaches the connecting pin from the rear and is detachably fitted to the connecting pin from the outside of the connecting pin. A pair of upper and lower mount holders provided so as to be freely pivotable in the vertical direction via a pivotal support portion, and a mount holder on the rear side of the pivotal support portion so as to be removably inserted from the rear. It was equipped with a wedge member for locking the movement.
[0003]
This conventional work machine coupling device has been devised so that the work machine side does not collide with the PTO shaft when the work machine is attached or detached because the lower tractor side receiving portion is located in front of the PTO shaft.
[0004]
[Problems to be solved by the invention]
However, the conventional device does not completely prevent the work machine side from accidentally colliding with the PTO shaft when the work machine is detached.
Therefore, it has been considered to prevent an unexpected collision of the work implement by positioning the lower receiving portion on the tractor side behind the PTO shaft.
However, in order to position the receiving part behind the PTO shaft, if the position of the receiving part and the connecting pin is left as it is and the position is changed rearward as a whole, the overall arrangement of the work implement is The total length of the TLB becomes longer, the weight balance becomes worse, and this is contrary to the compactness of the TLB.
[0005]
In addition, when the work implement is repositioned as a whole, the lower surface of the rear end of the work implement will be farther away than the rear wheel of the tractor, and the start angle ( When the TLB is loaded onto the truck bed, the rear end of the work machine is grounded, which makes it difficult to load.
Therefore, it has been considered that the position of only the lower receiving portion is changed rearward from the rear end of the PTO shaft, instead of shifting the entire coupling device backward.
[0006]
However, if only the lower receiving part is shifted rearward, the upper connecting pin will be positioned in front of the receiving part, and the rear end of the wedge member on the work machine side will be inclined upward, so that Will be occupied. This is because the pair of upper and lower mount holders are formed symmetrically, and the wedge member needs to be arranged in a direction perpendicular to the line connecting the connecting bar and the mount holder.
A step of the work machine is disposed above the wedge member. However, if the rear end portion of the wedge member is located at a high position, there arises a problem that the wedge member collides with the step.
[0007]
Therefore, the present invention provides a work machine connection device in which the wedge member does not interfere with the step as in the conventional case even if the lower receiving portion is positioned behind the upper connection pin. With the goal.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following measures. That is, a feature of the present invention is a connection device for a work machine that is detachably attached to a rear portion of a tractor, and a receiving portion of an upper opening provided below the rear portion on the tractor side and on both left and right sides. A connecting pin provided on the upper side of the receiving part, a connecting bar provided on the work machine side and detachably fitted to the receiving part from above, and the connecting pin approaching the connecting pin from behind A pair of upper and lower mount holders that can be pivoted up and down via a pivotal support so as to be openable and closable forwardly so as to be detachably fitted to the connecting pin from the outside of the radial direction, and a rear part from the pivotal support And a wedge member that is removably inserted between the mount holders from the rear to lock the rotation of the mount holder, and the receiving portion protrudes rearward from the rear end of the tractor. Behind the rear end of the shaft Has location, the connecting pin is provided on the remote forward by the receiving portion, the pair of upper and lower mounting holders are formed asymmetrically, the wedge member has its rear end is inclined arranged to face downward In the point.
[0009]
Since the receiving portion is positioned behind the rear end of the PTO shaft protruding rearward from the rear end portion of the tractor, the work implement is prevented from accidentally colliding with the PTO shaft when the work implement is attached or detached. In addition, by forming the pair of upper and lower mount holders asymmetrically, the wedge member can be arranged in an inclined shape so that the rear end thereof 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 a circumferential surface concentric with the pivotal support portion of the mount holder, and the pair of upper and lower mount holders when the front portion of the mount holder is rotated in the expanding method. It is preferable that the rear end surface is configured to come into contact with the front end portion of the wedge member.
[0010]
With this configuration, when the work machine is detached, the wedge member in contact with the mount holder can swing up and down even if the mount holder rotates due to the contact between the mount holder and the connecting pin. Absent.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a TLB (tractor / front loader / backhoe) having a tractor 1, a front loader 2 attached to the front of the tractor 1, and a backhoe 3 attached to the rear of the tractor 1. are doing. A mid-mount mower 4 is attached to the lower abdomen of the tractor 1.
The device for detachably mounting the backhoe 3 to the tractor 1 is the work machine connection device 5 according to the present invention. However, the connection device 5 is not limited to the device for the backhoe 3. Alternatively, other working machines other than the backhoe 3 may be connected.
[0012]
The tractor 1 is a so-called frame-type tractor, has a body frame 6 that 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 transmission case 8 are connected by a power transmission shaft.
A front axle case for supporting the front wheel 9 is supported at the front portion of the vehicle body frame 6, and the front axle case and the transmission case 8 are connected by a front wheel drive shaft. A rear axle case for supporting the rear wheel 10 protrudes from the transmission case 8 to the left and right sides. A PTO shaft 11 protrudes rearward from the rear end surface of the mission case 8.
[0013]
A hydraulic device for raising and lowering the work implement is attached to the upper part of the mission case 8, and a driver's seat 12 is disposed 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 unit 13 having a steering handle and the like is provided at the rear of the bonnet.
A floor seat is provided from the lower side of the driver seat 12 to the control portion 13, and the fenders 14 for the rear wheels are attached to the left and right side portions of the floor seat.
[0014]
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 and rear direction. The left and right body frames 6 are connected and fixed by a plurality of front and rear lateral members 15 and 16. The lateral member 16 in the vicinity of the mission case 8 is adjustable in length.
A mast support frame 17 is fixed to the side face of the vehicle body frame 6 in the front-rear direction halfway portion so as to project outward. The mast support frame 17 and the rear part of the vehicle body frame 6 are connected by a reinforcing frame 18. The reinforcing frame 18 is arranged so as to overlap the vehicle body frame 6 in a side view.
[0015]
A rear connection frame 19 is attached to the rear ends of the left and right vehicle body frames 6 so as to protrude vertically. The lower ends of the pair of left and right rear connection frames 19 are connected by a lateral member 20 so as to be adjustable in length.
The upper portion of the rear connection frame 19 is connected to the hydraulic device and is connected to the vehicle body frame 6 by a reinforcing frame 21 extending forward. A lops mounting frame 22 is fixed to the left and right sides of the upper end of the rear connecting frame 19 so as to project from the left and right sides, and a lops 23 is mounted on the lops mounting frame 22. This lops 23 protects the operator of the driver's seat 12.
[0016]
A top link bracket is provided on the upper portion of the rear connection frame 19 so that the backhoe 3, the front loader 2, and the mid-mount mower 4 can be detached and a rotary tiller, a wagon, etc. can be installed as a rear work machine. The left and right lower link pins are equipped at the bottom, and the hitch connection is equipped at the bottom.
The front loader 2 pivotally supports the base of the boom 25 at the upper part of the left and right masts 24 so as to swing up and down, and pivots the bucket 26 at the tip of the boom 25 so as to be able to dump freely. The boom 25 is a boom cylinder. Each bucket 26 can be hydraulically driven by a bucket cylinder.
[0017]
The mast 24 is configured to be fitted into the mast support member of the mast support frame 17 from above and locked with a lock pin.
The mid-mount mower 4 is attached to the lower part of the abdomen of the tractor via a suspension means so as to be able to move up and down. Power is transmitted from the mission 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 attachment bodies 28 fixed to the front side of the base frame 27. A swing bracket 29 is pivotally supported at the rear portion of the base frame 27 so as to be swingable around the vertical axis, and a step 30 is disposed on the upper portion of the base frame 27, and a backhoe control unit 30 a is mounted on the step 30. Hydraulically driven outriggers 31 are provided on the left and right sides of the frame 27.
[0018]
The swing bracket 29 can swing left and right by a single swing cylinder 32 provided on the base frame 27. The base of the boom 33 is pivotally supported by the swing bracket 29 so as to be rotatable around the horizontal axis, and the boom 33 is swingable up and down by a boom cylinder 34 provided between the swing bracket 29 and the boom 33. ing. An arm 35 is pivotally supported at the tip of the boom 33, and the arm 35 is swingable up and down by an arm cylinder 36 provided between the boom 33 and the arm 35. 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 be scooped and dumped freely. ing.
[0019]
Between the rear connection frame 19 and the attachment body 28 of the backhoe 3, the connection device 5 for the working machine is configured.
As shown in FIGS. 6 and 7, the connecting device 5 is provided at the upper opening receiving portion 39 provided at the lower end of the pair of left and right rear connecting frames 19 on the tractor 1 side, and at the upper portion of the rear connecting frame 19. A connecting pin 40, a connecting bar 41 provided on the mounting body 28 on the backhoe 3 side and fitted to the receiving portion 39 so as to be freely detachable from above, and the connecting pin 40 approaching from the rear to the connecting pin 40 A pair of upper and lower mount holders 43 provided so as to be pivotable up and down via a pivotal support 42 so as to be openable and closable forwardly so as to be detachably fitted to the connecting pin 40 from the radially outward direction of 40; A wedge member 44 that is removably inserted from the rear between the mount holders 43 at the rear of the pivotal support portion 42 and locks the rotation of the holder 43 is provided.
[0020]
The receiving portion 39 is located behind 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 formed asymmetrically. The wedge member 44 is inclined so that its rear end faces downward. The step 30 is disposed above the wedge member 44.
The connecting pin 40 has a left-right axial center and is provided between a pair of left and right side plates 45 (see FIG. 5) fixed to the side surface of the rear connecting frame 19.
[0021]
On the rear end surfaces of the lower portions of the left and right rear connection frames 19, a notch 46 that is recessed forward is formed. A receiving member 47 is fixed to the side surface of the rear connecting frame 19 at the position of the notch 46, and the receiving portion 39 is formed on the receiving member 47. In the present embodiment, the receiving portion 39 is configured by an upwardly open arc-shaped recess.
The upper step of the notch 46 is a restricting portion 48 that restricts the upward movement of the connecting bar 41 on the backhoe 3 fitted to the receiving portion 39, and faces the receiving portion 39 from above.
[0022]
The receiving portions 39 of the receiving member 47 are positioned rearward of the rear end of the PTO shaft 11 in the front-rear direction, positioned below the PTO shaft 11 in the up-down direction, and positioned on both left and right sides of the PTO shaft 11 in the left-right direction. To do.
On the other hand, the connecting bar 41 on the backhoe 3 side has a horizontal axis and is fixed over the lower portions of the left and right attachment bodies 28. The outer diameter of the connecting bar 41 is set such that it can be fitted into the arcuate recess of the receiving portion 39. The front end portion of the attachment body 28 in the vicinity of the connection bar 41 is expanded outward so as to be easily fitted to the receiving portion 39.
[0023]
The pair of upper and lower mount holders 43 are rotatably attached to upper and lower pivot portions 42 that are fixed to the outer surface of the attachment body 28 with a horizontal axis.
An arcuate recess 49 is formed on the opposing surface of the pair of mount holders 43 in front of the pivotal support 42 so as to be fitted to the connecting pin 40 from the radially outward direction.
A biasing means 50 for biasing the front portion of the pair of mount holders 43 in the expanding direction is provided between the pair of upper and lower mantle holders 43 at the rear of the mount holder 43 relative to the pivotal support portion 42. The urging means 50 is composed of a tension spring.
[0024]
The wedge member 44 includes a rod portion 52 that is slidably supported by a bracket 51 provided on the attachment body 28, and a head portion 53 provided at a front end portion of the rod portion 52. A compression spring 54 is interposed in the rod portion 52 between the portion 53 and the bracket 51, and the head portion 53 is always urged forward.
A lock release lever 55 is pivotally supported on the mounting body 28, and a pin 57 provided on the head portion 53 is engaged with a long hole 56 provided on the lever 55. The wedge member 44 can be moved in the front-rear direction by rotating the lock release lever 53 in the front-rear direction.
[0025]
The head portion 53 is provided so that the head portion 53 can be inserted between the mount holders 43 from the rear so as to maintain the closed state when the front portions of the pair of mount holders 43 are closed.
The wedge member 44 is inclined so that the rear portion of the rod portion 52 is positioned below. Therefore, the pair of upper and lower cloak holders 43 are formed asymmetrically.
The rear end surface of the mount holder 43 is a circumferential surface 58 concentric with the pivot portion 42 of the mount holder 43, and when the front portion is expanded from the pivot portion 42 of the mount holder 43, the circumferential surface 58 is configured to contact the head portion 53 at the tip of the wedge member 44 at the same time.
[0026]
A step 30 of the backhoe 3 is disposed above the wedge member 44.
The lower surface of the step 30 and the wedge member 44 are configured not to interfere with each other.
The operation of attaching the backhoe 3 to the tractor 1 with the above configuration will be described. In a state where the backhoe 3 is detached from the tractor 1, the mount holder 43 is expanded by the urging means 50. Further, prior to mounting the backhoe 3 on the tractor 1, the head portion 53 of the wedge member 44 is brought into contact with the circumferential surface 58 on the rear surface of the mount holder 43. The backhoe 3 is held in a state where the left and right outriggers 31 and the bucket 37 are grounded.
[0027]
In order to mount the backhoe 3 on the tractor 1, the tractor 1 is moved backward so that the receiving portion 39 is positioned below the connection bar 41 (in the case where the position of the connection bar 41 is not suitable for the coupling work, By operating the outrigger 31, the boom 33, etc., the connecting bar 41 is positioned above the receiving portion 39).
Next, the outrigger 31 is raised to lower the backhoe 3, and the connecting bar 41 is fitted to the receiving portion 39 from above.
At this time, the connecting pin 40 is located in front of the mount holder 43.
[0028]
Next, the arm cylinder 36 or the bucket cylinder 38 is operated, and the base frame 27 and the attachment body 28 of the backhoe 3 are rotated forward around the connecting bar 41 to bring the mount holder 43 close to the tractor 1 side. .
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 connecting pin 40, so that the mount holder 43 closes against the biasing means 50. Then, the connecting pin 40 is sandwiched between the pair of mount holders 43.
[0029]
At this time, as the mount holder 43 is closed, the rear end side of the mount holder 43 is expanded. At this time, since the wedge member 44 is in contact with the circumferential surface 58 of the mount holder 43, the position of the wedge member 44 does not change even when the mount holder 43 rotates. When the rear portion of the mount holder 44 is expanded, 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 by the biasing means 50 of the mount holder 43 is prevented.
Thereby, the backhoe 3 is attached to the tractor 1.
[0030]
To detach the backhoe 3 from the mounted state, the mount holder 43 is expanded by the biasing means 50 when the lock release lever 55 is operated and the wedge member 44 is retracted to the rear of the mount holder 43. In this state, the reverse operation is performed.
That is, first, the arm cylinder 36 or the bucket cylinder 38 is operated, and the base frame 27 and the attachment body 28 of the backhoe 3 are rotated rearward around the connecting bar 41 to move the mount holder 43 away from the tractor 1 side. .
[0031]
Then, the connecting pin 40 is detached from the mount holder 43.
Next, the outrigger 31 is lowered to raise the backhoe 3, and the connection bar 72 is separated upward from the receiving portion 69. Thereafter, the tractor 1 is advanced.
According to the said structure, since the wedge member 44 and step 30 do not interfere, since step 30 can be formed widely, the space at the time of boarding / alighting can also be ensured enough. In addition, the rear end of the backhoe 3 can be positioned at the same position as the conventional case, even though the receiving portion 39 is shifted rearward from the PTO shaft 11, so that the starting angle α (see FIG. 4) is increased. And will not interfere with the loading of the truck into the loading platform.
[0032]
In addition, this invention is not limited to what is shown to the said embodiment.
[0033]
【The invention's effect】
According to the present invention, even if the lower receiving portion is positioned behind the upper connecting pin, the wedge member can be prevented from interfering with the step as in the conventional case.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.
FIG. 2 is a plan view showing the structure of a frame.
FIG. 3 is an exploded side view of the frame.
FIG. 4 is a side view of an essential part showing an embodiment of the present invention.
FIG. 5 is a plan view of an essential part showing an embodiment of the present invention.
FIG. 6 is a side view of the connecting device of the present invention before connection.
FIG. 7 is a side view after connection of the connection device of the present invention.
[Explanation of symbols]
1 Tractor 3 Working machine (Backhoe)
11 PTO shaft 30 Step 39 Receiving portion 40 Connecting pin 41 Connecting bar 42 Pivoting portion 43 Mount holder 44 Wedge member

Claims (3)

A connection device for a work machine that is detachably attached to a rear portion of a tractor, and is provided below a rear portion of the tractor side and on an upper opening receiving portion provided on both left and right sides, and on an upper side of the receiving portion. A connecting pin, a connecting bar provided on the work machine side and fitted to the receiving portion so as to be freely inserted and removed, and approaching the connecting pin from the rear so that it can be attached to and detached from the connecting pin from the radially outer side of the connecting pin. Can be inserted / removed from the rear between a pair of upper and lower mount holders that are pivotable in the vertical direction via a pivotal support so that the front can be opened and closed in order to fit externally, and a mount holder at the rear of the pivotal support. And a wedge member that locks the rotation of the mount holder.
The receiving unit is located behind the rear end of the PTO shaft projecting from the rear end of the tractor to the rear, the connecting pin is provided on the remote forward by the receiving portion, the pair of upper and lower The mount device is formed asymmetrically, and the wedge member is inclined so that the rear end thereof faces downward.   2. The work machine connection device according to claim 1, wherein a step of the work machine is disposed above the wedge member.   The rear end surface of the mount holder is a circumferential surface concentric with the pivot portion of the mount holder, and when the front portion of the mount holder rotates in the expanding direction, the pair of upper and lower mount holders The work device coupling device according to claim 1, wherein a rear end surface of the work device is configured to contact a tip portion of the wedge member.

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