JPS5933209Y2 - Work equipment connection device - Google Patents

Description

[Detailed description of the invention] The present invention is a work equipment connection device that connects the work equipment to the traveling work vehicle in combination with a lower link so that it can be raised and lowered, and also bends in the middle to raise the work equipment further. Regarding.

As a conventional device of this type, there is a work machine lifting device disclosed in Japanese Utility Model Application Publication No. 53-73907.

This conventional device has a first link and a second link, which are coupled to a lower link to connect the work machine to the tractor so as to be freely raised and lowered, and are connected via a connecting shaft so as to be bendable in the direction of raising and lowering the work machine. One of these links is pivotally supported on the tractor 1 and the other on the work machine, and a connecting pipe is slidably fitted to both links, and this connecting pipe is elastically positioned at a connecting shaft fitting position. It is provided with a spring and an arm that resists the spring and detaches the connecting pipe from the connecting shaft fitting position when the work equipment is raised, and it is possible to obtain a bent state and a non-bending state of both links, and to change the state. However, the connecting pipe that changes its state slides on both links, and if it is manufactured in a severe manner, it will be difficult to slide and there will be play, and it will be in an unbendable state, and the second link and work The machine wobbles, it is difficult to hold the machine at an accurate working height, and it is prone to breakage due to compressive loads.Also, the force that causes the connecting pipe to slide is due to the restraint of the arm, but the force is intersects the sliding direction, so
Smooth sliding is difficult to achieve, and it may become distorted, making it difficult to change the state smoothly.

In view of the problems of the conventional device, the present invention has been developed to achieve both refraction and non-refraction states using only a member that rotates the connecting fittings and the refraction link, which are connected by a connecting shaft. A working machine coupling device that provides a strong and smooth display state, and eliminates the need for a return means for an engaging body to obtain a non-bending state. The purpose is to provide

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

In the figure, numeral 1 is a transmission case, which is the body of a traveling work vehicle.

Reference numeral 2 denotes a hydraulic lifting device, which is provided with a pair of left and right lift arms 3, and is provided on the rear upper surface of the vehicle body 1.

This hydraulic lifting device 2 consists of a cylinder and a piston,
If pressure oil is sent to the piston, each lift arm 3
is lifted up, and each arm 3 descends when the pressure oil is released.

Reference numeral 4 denotes a power take-off shaft, which is provided in a protruding manner at the lower center of the rear surface of the vehicle body 1.

Reference numeral 5 is a mounting base, which is fastened to the upper center of the rear surface of the vehicle body 1 with bolts 6 shown in Fig. and the bracket 8 largely protrudes rearward.

Reference numeral 9 is a three-point link mechanism consisting of a top link 10 in the center and a pair of lower links 11 on the left and right, which connects a working machine 12, which is a rotary tiller in the embodiment, to the traveling work vehicle 1 so as to be able to rise and fall freely. It is a device.

The working machine 12 includes a transmission case 14 having a power receiving shaft 13;
A machine frame 19 includes a ground working part 15 driven through a transmission body in a transmission case 14 and includes a top mast 16 in a side view shape, a support link 18 connecting the top mast 16 and a bracket 17, and the like. , the machine frame 1
The front part of a support rod 20 is pivotally connected to the support rod 20, and a gauge device 22 includes a pair of left and right gauge wheels 21 at the rear of the support rod 20.
and an adjustment handle 23 at one end, and the top mast 16
The work depth adjustment device 24 is made of a screw structure connecting the support rod 20 of the gauge device 22 and the support rod 20 of the gauge device 22.

One end of the top link 10 of the three-point link mechanism 9 is pivotally connected to the rear end of the top link bracket 8 with a ball joint 25, and the other end of the top link 10 is connected to the upper end of the top mast 16 with a ball joint 26. It is pivoted.

Further, one end of each of the pair of left and right lower links 11 is pivotally connected to both lower sides of the vehicle body 1 with a ball joint body 27, and each other end is pivotally connected to each bracket 17 of the work equipment frame 19 with a ball joint body 28. A longitudinal midway point of each lower link 11 and each lift arm 3 are connected by a lift rod 29, and a working machine 12 is connected to the vehicle body 1 therein so as to be able to rise and fall freely.

Further, the power take-off shaft 4 and the power reception shaft 13 are interlocked and connected by a joint shaft 31 having a universal joint 30 at both ends.

In the above configuration, the connecting portion at the tail end of the top link bracket 8 extends to the vicinity of the longitudinally intermediate portion of the lower link 11; however, in the present invention, one end of the top link 10 is attached to the pin of the base 5. The holes for the body 7 may be used to connect the body 7 with a ball joint body 25.

However, it is more preferable to connect one end of the top link 10 to the tail end connection portion of the top link bracket 8 which protrudes greatly as shown in the figure, using a ball joint 25.

Accordingly, in the present invention, in the above-mentioned connecting device, the following specific measures are particularly taken for the top link 10.

In the first embodiment shown in FIGS. 2 to 4, reference numeral 32 denotes a bent portion, which is provided midway in the longitudinal direction of the top link 10. As shown in FIG.

The bending section 32 is provided with a ball contact means 26 at one end, and the joint body 26
A bent link 33 is pivotally connected to the top mast 16, and a ball joint body 25 is provided at one end, and the joint body 25 is pivotally connected to the top link bracket 8, and a bifurcated connecting portion 34 is provided at the other end.
A connecting fitting 35 with
The operating link 37 is inserted into the connecting portion 34 and is rotatably connected in the vertical direction with a pivot pin 36. They are connected so as to be bendable in the direction of lifting and lowering of the working machine.

In the operating link 37, a pin hole 39 for the connecting pin 38 has a diameter sufficiently larger than the diameter of the pin 38, and the operating link 37 is prevented from floating by the difference in diameter.

Further, the operating link 37 has a diagonal portion 37a at the tip of the pair of rising walls, and a pivot pin 4 is provided at the upper part between the diagonal portions 37a.
A wedge-shaped engaging body 41 is rotatably provided via the connecting member 35, and this engaging body 41 connects the wall 35a of the connecting fitting 35 and the bending link 3.
The connecting fitting 35 is interposed between the tapered surface 33a of No. 3 and the connecting fitting 35.
The bending link 33 is restrained so as not to be able to be bent with respect to the lifting and lowering direction of the working machine.

The direction in which the engaging body 41 is inserted between the connecting fitting 35 and the bending link 33 is substantially downward when the working machine 12 is in the working state shown by the solid line in FIG. Due to its weight, it will fit in even if it is not forcibly fitted, and the vibration from the working machine 12, etc. will ensure more reliable fitting.

Reference numeral 42 designates a restraint system for releasing the engagement body, which is provided on the top mast 16 in a forward upward tilting position in the basic embodiment shown in FIGS.
In the normal state, they correspond to each other by separating from each other, and when they come into contact with each other, the operating link 31 is rotated around the pivot pin 36, and the engaging body 41 is separated from between the connecting fitting 35 and the bending link 33. can be done.

The restraint body 42 may extend from the operating link 37 toward the top mast 16 as shown in FIG. 5, and the receiver 43 may have a sawtooth shape 43a as shown in FIG. Furthermore, the check member 42 is connected to the telescopic member 42 by a bolt 44 or the like in order to adjust the engagement timing, as shown in an example in FIG.
It can also be used as A0).

In addition, in each figure, 45 is a biasing body shown by a leaf spring,
The top wall 37b of the operating link 37 is provided on the connecting fitting 35.
is pressed downward.

According to the embodiment of the present invention configured as described above, the first
The solid line state shown in the figures and FIG.
1, so when the power take-off shaft 4 is driven and the traveling working vehicle 1 is driven, the tilling section 15 is interlocked and a predetermined tilling operation determined by the gauge device 22 is carried out.

During such tilling work, even if the top link 10 is bendable in the vertical direction at the bending part 32, the wedge-shaped engaging body 41 provided on the operating link 37 will not be able to connect to the connecting fitting 35.
Since it is interposed between the wall 35a and the tapered surface 33a of the bending link 33, there will be no unexpected bending during tilling work.

Furthermore, even if the working depth is adjusted during work, since there is play between the restraining body 42 and the operating link 37 as indicated by the symbol S, there is no problem in adjusting the working depth.
The embodiment shown in FIG. 7 has the advantage that the interval S can be adjusted.

In the above-mentioned plowing work, it is necessary to lift the working machine 12 on the headland of the field so that the working vehicle 1 can turn, and when driving on a general road, the working machine 12 must be lifted in a raised position. It is necessary to hold it.

The work equipment 12 is raised by sending pressure oil to the hydraulic lifting device 2 provided on the traveling work vehicle 1 and lifting the pair of left and right lift arms 3. 3 and each lower link 11 are connected by a lifting member 29 such as a lift rod or chain, the work implement 12 can be lifted with respect to the traveling work vehicle 1 as shown by the chain line in FIGS. 1 and 4. .

At this lifting height, the angle between the top link 10 and the top mast 16 gradually becomes smaller, and when the distance S disappears, the restraining member 42 acts to push up the operating link 37, and the operating link 37 It is pushed up within the range of the play between the connecting shaft 38 and the pin hole 39, and the wedge-shaped engaging body 41 is disengaged as shown in FIG. Becomes bendable.

Therefore, as shown in FIG. 4, the checker body 4
2 until the operating link 37 is pushed up, the top link 10 moves along the entire axial length as shown by A, but when the engagement of the engaging body 41 is released or disengaged as described above,
The top link 10 bends at the bending part 32 and moves as shown by the symbol B, and the top mast 16 of the work implement 12 is pulled forward and downward, and the rear of the work implement 12 rises. Therefore, the work machine 12 can be specially upgraded to a ground-based birdman.

At this time, if the top link bracket 8 that protrudes significantly rearward as in the embodiment is used, the lifting amount will be significantly large, but even if this top link bracket 8 is adopted, the lifting amount will be small. If the top link 10 is made bendable as in the embodiment, it will be more effective.

In this way, when the work machine 12 is lifted to a large extent relative to the lifting height of the lift arm 3, the universal joint portion 30 of the universal connection shaft 31,
Since the angles formed by the joints 30 are equiangular, the noise caused by the unequal angles of the universal joints 30, 30 is reduced, and the transmission force can be transmitted accurately.
And based on the fact that it can be lifted forward in a large tensile manner,
It is convenient to work over the ridges, the overall front-rear weight balance is good, and not only can stable running and companionship be achieved, but also the handle 23 can be brought closer to the seat of the vehicle when adjusting the plowing depth, making the adjustment easier. It is also convenient to operate.

It should be noted that reliable engagement of the restraint member 42 is required when driving on a general road, and in such a case, it is advantageous to use a sawtooth engagement portion 43a as shown in FIG. Machine 12
In order to lower the vehicle body 1 after lifting it, the pressure oil applied to the hydraulic lifting device 2 is released, and the weight of the work implement 12 gradually lowers the entire work implement 12.

During this descending process, the bent portion 32 of the top link 10
is extended and deployed, and in this extension and deployment, the engaging body 41 is inserted substantially downward by its own weight between the bending link 33 and the connecting fitting 35, and when the restraining body 42 is separated from the operating link 31,
The degree of freedom of bending of the connecting fitting 35 and the bending link 33 is restricted by the engagement body 41 .

Further, even if the work equipment 12 is lowered and receives a ground reaction force when the gauge wheel 21 touches the ground, the engaging body 41 will not be disengaged or disengaged, and by making the operating link 37 into an inverted gutter shape, the ground reaction force will not occur. It is not bent by force and is held in the working position again.

That is, the coupling device of the present invention connects the working machine 12 to the traveling work vehicle 1 in combination with the lower link 11 so as to be able to rise and fall freely, and the bending link that is connected via the connecting shaft 38 so as to be bendable in the direction of raising and lowering the working machine. 33 and a connecting fitting 35,
In the work implement coupling device in which one of the bending link 33 and the connecting fitting 35 is pivoted to the traveling work vehicle 1 and the other to the work implement 12, the actuation link 37 pivoted to the bending link 33, and the actuation link 37 an engaging body 41 which is pivotably supported by the bending ring 33 and the connecting fitting 35 and is removably inserted into the space between the bending ring 33 and the connecting fitting 35 to restrain them unbendably; The engaging body 41
and a restraining member 42 for rotating the actuating link 37 with respect to the bending link 33 in order to disengage the engaging member 41, and the engagement member 41 is configured such that the insertion direction thereof is substantially downward when the work implement 12 is in the working state. ing.

According to the present invention described in detail above, the bending link 33 and the connecting fitting 3 can be connected to each other by using only the rotating member without using any sliding member.
5 can be changed to a refracting state and a non-refracting state, and the state can be changed smoothly, and in the non-refracting state, it can be made into one strong connection without any play, allowing the work equipment to perform accurate work. Can be held at any height.

In addition, since the engaging body 41 in the working state has a substantially downward insertion direction, the insertion operation can be performed regardless of the presence or absence of the biasing body.

In addition, the work machine may be a drive type work machine or a non-drive type work machine (
plows, etc.), but it is particularly effective when applied to drive-type working machines.

[Brief explanation of the drawing]

Figure 1 is a schematic side view showing the overall configuration of the present invention, Figure 2
, 2 is a side sectional view showing the main part of the present invention before and after refraction,
Fig. 3 is a plan view of Fig. 2 1, Fig. 4 is a side view showing the main parts of the basic example of the invention, Fig. 5 is a side view of the main parts of the second embodiment of the invention, and Fig. 6 is a side view of the main parts of the basic example of the invention. FIG. 7 is a side view of the main parts of the third embodiment, and FIG. 7 is a side view of the main parts of the fourth embodiment. 1... Traveling work vehicle, 2... Hydraulic lifting device, 3... Lift arm, 8... Top link bracket, 9... 3-point link mechanism, 10...Top link, 11...
Lower link, 16...Top mast, 32.
...Refraction section, 33...Refraction link, 35
......Connection fittings, 37...Operating link,
38...Connection shaft, 41...Engagement body, 4
2... Check system.

Claims (1)

[Scope of utility model registration request] A bending link 33 which, together with the lower ring 11, connects the work implement 12 to the traveling work vehicle 1 so that it can rise and fall freely, and is connected through a connecting shaft 38 so as to be able to bend in the direction of raising and lowering the work machine.
and a connecting fitting 35, in which one of the bending link 33 and the connecting fitting 35 is pivotally supported to the traveling work vehicle 1, and the other to the working machine 12, respectively.
3 and the operating link 37
an engaging body 41 which is pivotably supported by the bending link 33 and the connecting fitting 35 and is removably inserted between the bending link 33 and the connecting fitting 35 to unbendably restrain them; In order to release the engaging body 41 from between the bending links 33
A work machine coupling device characterized in that the engaging body 41 is inserted in a substantially downward direction when the work machine 12 is in a working state.