JPH0697887B2 - Connection device between tractor and work implement - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coupling device between a tractor and a working machine.

(Prior Art) When connecting a rotary tiller to the rear of the tractor via a three-point link mechanism consisting of a central top link and a pair of left and right lower links in a vertically movable and removable manner, this connecting work is performed. Technology that makes it easy to
It is disclosed in Japanese Utility Model Publication No. 59-33206.

In the above, the rear end portions of both lower links are connected by a connecting member, and the cultivating device is provided with a pair of left and right engaging portions with which both end portions of the connecting members are detachably engaged from the front, The joint portion is provided with a blocking mechanism that releasably blocks the disengagement of the connecting member from the engaging portion.

Therefore, in the above-mentioned one, the tractor is moved backward to approach the cultivator side, the both end portions of the connecting member are engaged with both engaging portions of the working machine, and the blocking mechanism causes the engaging portion of the connecting member. Both lower links can be connected to the tiller by a simple operation of preventing the detachment from the cultivator.

(Problems to be solved by the invention) However, in the above, no consideration is given to facilitating the connection between the PTO shaft of the tractor and the input shaft of the tiller, and an improvement on this point is desired. Has been done.

An object of the present invention is to provide a connecting device for a tractor and a working machine that can solve the above problems.

(Means for Solving Problems) In order to achieve the above object, the features of the present invention are:
The working machine R is detachably connected to the front or rear of the tractor 1 via a link mechanism 9 having a pair of left and right connecting links 11, and the PTO shaft 8 of the tractor 1 and the input shaft 53 of the working machine R are transmission shafts. 37, the working machine connecting side ends of both the connecting links 11 are connected by a connecting member 13, and the left and right side parts of the connecting member 13 are moved by the approaching motion to the working machine R. A leaf spring 31 fixed to both left and right sides of the joint member 13 and directed toward the center is provided as a connecting portion releasably connected to R. The leaf spring 31 has a support case at the center in the left-right direction. 29 is supported, and the support case 29 is positioned at either one of the front and rear sides through a straight line connecting the left and right fixed positions of the leaf spring 31, and the front and rear portions are elastically deformed by the leaf spring 31. The position can be changed to the other Operation mechanism for repositioning the casing 29 in the longitudinal direction
83 is provided, a connecting shaft 34 is rotatably supported on the supporting case 29, the connecting shaft 34 is connected to the transmission shaft 37, and the operating mechanism 83 moves the supporting case 29 back and forth. A clutch 59 that is connected / disconnected to / from the input shaft 53 by changing the position.
In addition, when the clutch 59 is connected, a centering mechanism 61 for matching the shaft centers of the connecting shaft 34 and the input shaft 53 with each other is provided.

(Operation) When connecting the work implement R to the tractor 1, both connecting links
The working machine connecting end of 11 is brought close to the working machine R, and the working machine R
Releasably connect to.

Next, the operation mechanism 83 moves the support case 29 substantially in the front-rear direction to switch the position thereof instable, thereby setting the clutch 59 between the connecting shaft 34 and the input shaft 53 in the connected posture and the centering mechanism 61. Thus, the axes of the connecting shaft 34 and the input shaft 53 are matched with each other.

The "unstable switching" means that the intermediate position before and after is unstable and the stable state is established before and after the intermediate position. That is, the position of the support case 29 is changed from one of the front and rear sides to the other side through elastic deformation of the leaf spring 31.

Further, when separating the work implement R from the tractor 1, the holding mechanism 83 moves the support case 29 substantially in the front-rear direction to switch the position thereof instablely, and the clutch between the connecting shaft 34 and the input shaft 53. 59 is the cutting position.

After that, the connection between the working machine connecting end of the connecting link 11 and the working machine R is released.

(Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 2, 1 is a tractor, 2 is a tractor vehicle body, and 3 is an elevating device mounted on a rear portion of a tractor vehicle body 2. A hydraulic device for raising and lowering a working machine, which has a pair of left and right lift arms 4. 5 is a seat, 6 is a rear wheel, 7 is a rear wheel fuser,
Reference numeral 8 is a PTO shaft, which projects rearward from the rear end of the vehicle body 2.

R is a side drive type rotary tiller which is exemplified as a working machine, and is connected to the rear of the tractor 1 via a three-point link mechanism 9 so as to be vertically movable and detachable.

As shown in FIG. 1, FIG. 3 to FIG. 5, the three-point link mechanism 9 is composed of a central top link 10 and lower links 11 exemplified as a pair of left and right connecting links. 11 and each lift arm 4 are connected by a lift rod 12, respectively.

As shown in FIGS. 7 and 8, 13 is both lower links 11
A connecting member that connects the rear end portions of the connecting member 13 to the left and right side end portions of the tubular body 14 and the pair of left and right shaft bodies 15 that project from the left and right end portions of the tubular body 14 to the left and right sides. Become. The central portion on the left and right sides of the cylindrical body 14 is formed to be curved so as to project downward.

As shown in FIGS. 9 and 10, a hollow circular truncated cone side guide member 16 is externally fitted and fixed to the inner end portion of each shaft body 15 with the small diameter end surface facing outward, and A dogleg-shaped front guide body 17 is fixed to the front portion of the outer side surface of the guide body 16. Further, a circumferential groove 91 is formed on the inner side of each shaft body 15, and the ball joint portion 18 of each lower link 11 is detachably fitted on the outer side to form a pin.
It is stopped by 19

From the left and right ends of the cylindrical body 14, upper and lower projecting plates 20 and 2, respectively.
1 is projected forward, and a mounting plate 22 is fixedly attached to the front ends of the upper and lower projecting plates 20 and 21.

The rear end of the top link 10 is provided with mounting pins 24 projecting to both sides via a ball joint 23 and a holding plate.
25 is stuck.

Reference numeral 26 is a spring rod having a substantially mountain shape when viewed from the front, and both sides of the lower portion are inserted into the upper and lower projecting plates 20 and 21 on the left and right so that the pin 2 can be freely inserted and removed.
It is fixed by 7, and the central part in the left-right direction of the upper part thereof is inserted into and removed from the holding plate 25 so that the spring rod 26 is
It is laid between the left and right ends of the via via the top link 10. As shown by the phantom line in FIG. 5, the spring rod 26
A ring 28 may be formed by circularly encircling the middle part of each side of the.

The left and right sides of the spring rod 26 are bent in a dogleg shape in the front view and the side view both when the tiller R is connected and when it is not connected. However, the bending angle is large.

As shown in FIG. 11, 29 is a support case, which is disposed diagonally forward and upward of the center of the tubular body 14 in the left-right direction, and a pair of fixing plates 30 are located outside the left and right sides of the support case 29. It is projected to the direction.

Reference numeral 31 is a pair of left and right leaf springs, and each leaf spring 31 is detachably attached to the corresponding mounting plate 22 and fixed plate 30 on each side by bolts 32. Unstable switching between the position and the rear position shown in FIG.

Reference numeral 33 denotes a pair of left and right ring bodies, which are arranged on both left and right sides of the support case 29 and fixed to the support case 29 and the fixed plate 30.

Reference numeral 34 denotes a connecting shaft, which is rotatably supported by a bearing 35 on a support case 29, and is interlockingly connected to the PTO shaft 8 by a transmission shaft 37 which is expandable and contractible and has universal joints 36 at both ends.
An insertion hole 38 that opens rearward is formed in the axial center portion of the rear portion of the connecting shaft 34.
Are formed, and engaging claws 39 are arranged at equal intervals in the circumferential direction on the outer peripheral portion of the rear end surface as shown in FIG.

As shown in FIG. 6, the tiller R is composed of an input case 40 located in the center of the front part in the left-right direction, and a pair of left and right side plates 41 projecting obliquely upward and forward from the input case 40. The top mast 42, a pair of support arms 43 projecting from the input case 40 to the left and right sides, a pair of left and right brackets 44 projecting forward from the midway portion of each support arm 43, and the top mast 42 A pair of left and right support links 47 removably attached to the upper end of each side plate 41 and the front end of each bracket 44 by bolts 45 and 46, respectively, and a transmission that is laid down from the outer end of each support arm 43. A cultivating part 49 comprising a case 48 and a side plate, and a cultivating shaft horizontally hung between the lower ends of the transmitting case 48 and the side plate and driven to rotate, and a plurality of cultivating claws provided on the cultivating shaft.
And a tillage cover 50 covering the tillage part 49, a pair of left and right gauge wheels 51, a tilling depth adjusting mechanism 52 for raising and lowering these gauge wheels 51, and the like.

As shown in FIGS. 7 and 8, the input case 40 has an input shaft 53 projecting forward supported rotatably by a bearing 54. The input shaft 53 has a center shaft 55 and an outer fitting shaft 56 spline-coupled to the front portion of the center shaft 55, and a bolt 57 screwed into the front portion of the center shaft 55 causes the outer fitting shaft 56 to It has been removed.

As shown in FIG. 12, engaging claws 58 are arranged on the front end surface of the outer peripheral portion of the outer fitting shaft 56 at equal intervals in the circumferential direction.
58 and the engaging claw 39 of the connecting shaft 34 constitute a dog clutch 59 that can be freely connected and disconnected.

In addition, at the tip of the bolt 57, there is formed an insertion projection 60 which is removably inserted into the insertion hole 38 of the connecting shaft 34 to match the axial centers of the connecting shaft 34 and the input shaft 53 in the front-rear direction. The insertion protrusion 60 and the insertion hole 38 form a centering mechanism 61.

As shown in FIG. 13 and FIG. 14, at the front end portions of the side plates 41 of the top mast 42, an upper engaging portion 64 with which the mounting pin 24 of the top link 10 is detachably engaged from below is provided. Notched.

As shown in FIG. 15, 63 is a kicking mechanism, which has a support shaft 64, and the support shaft 64 is provided between the upper ends of the front end portions of the side plates 41 of the top mast 42.

A tubular body 65 is fitted onto the support shaft 64 so as to be rotatable relative to one another, but one end portion of the tubular body 65 is notched to form a pair of locking end faces 66, and the locking end faces 66 are formed on the top mast 42. By contacting the side plate 41, the rotation range of the cylindrical body 65 is restricted.

An L-shaped operation lever 67 is fixedly mounted on the cylindrical body 65 so that the mounting pin 24 of the top link 10 can be kicked out from the upper engaging portion 62 by rotation, and a spiral spring can be mounted on the cylindrical body 65. 68 is wound around, each end of which is engaged with the side plate 41 and the operating lever 67, and biases the operating lever 67 in a rotational direction in which it is separated from the upper engaging portion 62.

Further, a mountain-shaped guide 69 for guiding the ball joint portion 18 of the top link 10 to the front end portion of the top mast 42 is fixedly provided on the front lower end surfaces of the side plates 41 of the top mast 42.

Reference numeral 70 denotes a lower engagement portion that is substantially U-shaped in side view, and is used for each bracket.
It is fixed to the front end of 44, the lower part of the rear wall is projected downward from the front wall, and it is tilted forward to form a guide part.
71, each shaft body 15 of the connecting member 13 is engaged in the lower engagement portion 70 from below in a disengageable manner.

When the tiller R is not connected to the three-point link mechanism 9, the distance between the mounting pin 24 of the top link 10 and each shaft 15 in the vertical direction is the mounting pin 2 of the upper / lower engaging portions 62, 70.
It is set to be larger than the distance in the vertical direction between both positions where the shaft 4 or the shaft 15 is engaged.

As shown in FIGS. 9 and 10, 72 is a blocking mechanism,
The disengagement from the lower engaging portion 70 is releasably prevented, and its cylindrical body 73 is fixed to the rear surface of the lower engaging portion 70 so as to project rearward.

74 is a retaining pin, which is inserted into the cylindrical body 73 and the lower engaging portion 70 movably in the front-rear direction, and is biased forward by a biasing spring 75 wound around the retaining pin 74.

76 is an interlocking lever, and a bracket 77 is attached to each support arm 43.
Is rotatably supported around a horizontal shaft 78 via a lower end of the retaining pin 74, and its upper end is connected to an operating lever near the seat 5 via a wire 79. Has been done.

Reference numeral 80 denotes a cam body, which is pivotally supported by a horizontal shaft 94 fixed to the front end of the bracket 44, is inserted into a notch 81 formed in the lower engaging portion 70, and as shown in FIG. The lower end of the stopper contacts the front end of the retaining pin 74, whereby the retaining pin 74 is maintained in a state of being disengaged from the lower engaging portion 70. The lower end edge of the cam body 80 is a cam portion 82.

83 is an operating mechanism, the support shaft 84 of which is both support links 47
Are laterally provided via a mounting member 85 between the middle portions in the longitudinal direction.

A tubular body 86 is rotatably fitted in the central portion of the pipe-shaped support shaft 84 in the left-right direction, and is immovable in the left-right direction by a pin 87.

An operating lever 88 is projecting upward and obliquely rearward from the cylindrical body 86,
The operation lever 88 is connected to an operation lever arranged near the seat 5 via a wire, if necessary.

Further, an interlocking lever 89 is provided below the tubular body 86, and a semicircular insertion body 90 that is removably inserted into both ring bodies 30 of the support case 29 is fixedly installed on the interlocking lever 89. . Although not shown, a mechanism for holding the operation lever 88 at an arbitrary rotating position or a predetermined rotating position is provided.

According to the embodiment configured as described above, when the tiller R is connected to the tractor 1, the support case 29 that supports the connecting shaft 34 is set to the front position shown in FIG.

On the other hand, as shown in FIG. 3, the tiller R is mounted on the ground in a slightly forward tilted posture.
10, the retaining pin 74 of the blocking mechanism 72 is held in a state of being disengaged from the inside of the lower engagement portion 70 by the cam body 80, and the insertion body 90 of the operating mechanism 83 is slightly moved as shown in FIG. Keep backward.

In this state, as shown in FIG. 3, FIG. 10 and FIG.
The mounting pins 24 of the top link 10 and the shafts 15 of the connecting members 13 are positioned below the upper and lower engaging portions 62, 70 of the tiller R, respectively.

Then, the three-point link mechanism 9 is gradually raised by the hydraulic device 3, the mounting pin 24 of the top link 10 is engaged with the upper engagement portion 62, and the ball joint portion 23 of the top link 10 is kicked out 63.
Of the shaft body 15 is engaged with the lower engaging portion 70, and the cam body 80 is engaged with the cam portion by this engagement.
It is pushed up via 82 to release the locking of the retaining pin 74 by the cam body 80. Then, the retaining pin 74 moves forward by the elastic force of the biasing spring 75 to engage with the circumferential groove 91 of the shaft body 15,
The lower engagement portion 70 is inserted into the front and rear ends of the lower engagement portion 70, and the shaft 15 is prevented from being disengaged from the lower engagement portion 70.
Then, the tiller R is brought into a connected state.

At the time of this connecting work, even if the mounting pin 24 deviates from the normal movement path, the ball joint portion 23 of the top link 10 is guided by the mountain-shaped guide plate 69 of the top mast 42, so that the mounting pin 24 moves normally. Its position is modified to the route.

Further, even when each shaft body 15 is deviated from the normal movement path, sliding between the outer surface of each side guide body 16 having a truncated cone shape and each lower engagement portion 70, and the rear surface of the front guide body 17 having a shape And the front surface of each lower engaging portion 70, and the sliding of the guide portion 71 of each lower engaging portion 70 of each shaft body 15, the position of each shaft body 15 is corrected to the normal movement path. To be done.

By the way, when the tiller R is not connected to the three-point link mechanism 9, the distance between the mounting pin 24 of the top link 10 and each shaft 15 in the up-down direction is equal to the mounting pin 24 of the upper / lower engaging portions 62 or 70. Since the distance between the respective positions at which each shaft body 15 is engaged is larger than the vertical direction, the mounting pin 24 and each shaft body 15 are engaged in the upper / lower engaging portions 62, 70, respectively. Then, each side portion of the spring rod 26 is further bent outward and rearward, and the bending angle becomes large.

Thus, during the above-mentioned connecting work, generally, the upper and lower engaging portions 6
The mounting pin 24 and each shaft body 15 do not simultaneously engage in the insides of 2, 70, and normally, each shaft body 15 is engaged in each of the lower engaging portions 70 first, so that the ball joint of the top link 10 is engaged. The portion 23 contacts the guide plate 69 of the top mast 42, and the side portions of the spring rod 26 are largely bent.

Then, when the three-point link mechanism 9 is further raised in the above state, the tiller R rotates about the shaft 15 to the rear side, whereby the elastic force of each side portion of the spring rod 26 causes the top to move. The ball joint portion 23 of the link 10 slides on the guide plate 69 toward the front and diagonally upper side, and the mounting pin 24 of the top link 10 moves to the upper engaging portion 62.
It fits in well.

Further, even when the mounting pin 24 of the top link 10 is engaged in the upper engaging portion 62 first, each shaft body 15 is favorably placed in the lower engaging portion 70 due to the bending of each side portion of the spring rod 26. Engage.

As described above, even if the mounting pin 24 and each shaft body 15 are not simultaneously engaged in the upper and lower engaging portions 62, 70, there is no problem due to elastic deformation of the spring rod 26, and due to manufacturing error. , The upper and lower engaging portions 62, 70, the mounting pin 24, or the position of the vehicle body 15 in the vertical direction is deviated from the normal position, the spring rod 26
The above-mentioned displacement can be absorbed by the elastic deformation of No. 1, and in any case, the tiller R can be satisfactorily connected to the three-point link mechanism 9.

Further, at the time of the above-described connecting work, each shaft body 15 is attached to each lower engaging portion 70.
When engaged in, the lower end portions on both sides of the insert body 90 of the operation mechanism 83 are also inserted and engaged in the both link bodies 33 of the support case 29. In this case, even if the posture of the support case 29 deviates from the normal posture, the outer surface of the side guide body 16 slides with the lower engagement portions 70, and the rear surface of the front guide body 17 and the lower engagement portions 70. 70 The supporting case 29 is corrected to the normal posture by sliding on the front surface. still,
In the above case, the position of the insert 90 may be slightly adjusted by the operating lever 82 so that the insert 90 can be inserted into both ring bodies 33 favorably.

Thus, with the insert 90 inserted in both ring bodies 33,
By rotating the operation lever 88 to the front side, the leaf spring 31 is elastically deformed as shown in FIGS. 7 and 11, and the supporting case is supported.
Unstable switching of 29 to the rear position.

In this case, since the support case 29 is provided on the connecting member 13 side by the pair of left and right leaf springs 31, the support case 29 is stably switched to the rear position in a stable state.

Due to this unstable switching, the connecting shaft 34 moves rearward along with the extension of the transmission shaft 37, and the insertion projection 60 on the input shaft 53 side is inserted into the insertion hole 38 of the connecting shaft 34 to connect the shafts. Shaft 34 and input shaft 53
Both axial centers of are matched in the front-back direction.

Further, as shown in FIG. 12, both engaging claws 39 and 58 of the connecting shaft 34 and the input shaft 53 are engaged with each other in the circumferential direction, and the clutch 59 is in the connecting posture, and this posture is held by the leaf spring 31. To be done.

As described above, the work of connecting the cultivator R to the tractor 1 is completed, but in this connected state,
The input case is located above the central portion of the cylindrical body 14 which is recessed in the left-right direction.
40 and the front side of the input shaft 53 are located.

Next, when separating the tiller R from the tractor 1,
First, the operation lever 88 is rotated rearward to elastically deform the leaf spring 31, and the support case 29 is unstablely switched to the front position, and the transmission shaft 37 is reduced to reduce the connecting shaft 34. Move forward,
The insertion projection 60 is disengaged from the insertion hole 38 of the connecting shaft 34 toward the input shaft 53, and the engaging claws 39 and 58 of the connecting shaft 34 and the input shaft 53 are disengaged to disconnect the clutch 59. And

Next, the retaining pin 74 is moved rearward by the operation lever to be disengaged from the inside of the lower engaging portion 70.

In this state, the three-point link mechanism 9 is lowered by the hydraulic device 3 to disengage the mounting pin 24 of the top link 10 and each shaft 15 from the upper and lower engaging portions 62, 70, respectively, and to support them. When the insert 90 is removed from both ring bodies 33 of the case 29, the work of separating the tiller R from the tractor 1 is completed.

In the above case, when the mounting pin 24 is difficult to be detached from the upper engaging portion 62, the operating lever 67 of the kicking mechanism 63 is rotated as shown in FIG. 14 to move the ball joint portion 23 of the top link 10. It strikes, which causes the upper engagement portion 62 to
Can easily leave.

The interlocking levers 76, 79 on the left and right sides may be interlocked by an interlocking link 92 as shown by the phantom line in FIG.

Although the rotary tiller is used as the working machine in the embodiment, a working machine other than the rotary tiller may be used.

Furthermore, the present invention is applicable to a device that connects a working machine to a tractor via a two-point link mechanism, and also to a device that connects a working machine to the front side of the tractor.

(Effects of the Invention) As described in detail above, according to the present invention, not only the connecting work between the link mechanism and the working machine, but also the connecting work between the PTO shaft of the tractor and the input shaft of the working machine can be performed easily and reliably. Therefore, the work of connecting the work machine to the tractor can be performed more easily and in a shorter time. Further, since the support case can be unstablely switched to the front and rear positions by the leaf spring, the clutch formed between the connecting shaft and the input shaft can be reliably and easily held with a simple structure in the disconnecting posture and the connecting posture. .
The present invention has the above advantages and is of great benefit.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a partial cross-sectional side view of a main part, FIG. 2 is an overall side view, and FIG. 3 is a partial cross-sectional side view of the main part during connection work. 4 is a sectional view taken along the line AA of FIG. 1, FIG. 5 is a partial sectional front view showing the three-point link mechanism side of FIG. 4, and FIG. 6 is a working machine side of FIG. Front view,
FIG. 7 is a sectional view taken along the line BB in FIG. 1, and FIG. 8 is an exploded partial sectional plan view of a main part showing a posture different from that in FIG. 7,
FIG. 10 is a sectional view taken along the line CC of FIG. 4, FIG. 10 is a partial sectional side view of the portion shown in FIG. 9 at the time of connecting work, FIG. 11 and FIG.
Each drawing is a cross-sectional view taken along the line D-D and line E-E in FIG.
FIG. 13 is a partial side view of the connecting work, FIG. 14 is a partial side view of the separating work, and FIG. 15 is a sectional view taken along the line FF of FIG. 1 …… tractor, 8 …… PTO shaft, 9 …… three-point link mechanism, 10 …… top link, 11 …… lower link (connecting link), 13 …… connecting member, 29 …… supporting case, 31 …… Leaf spring, 34 ... connecting shaft, 37 ... transmission shaft, 53 ... input shaft, 59 ...
… Clutch, 61 …… Aligning mechanism, 62,70 …… Upper and lower engaging parts, 83 …… Operating mechanism, R …… Rotary tiller (working machine).

Claims (1)

[Claims] 1. A working machine (R) is detachably connected to the front or rear of the tractor (1) via a link mechanism (9) having a pair of left and right connecting links (11), and the work machine (R) is connected to the tractor (1).
In the one in which the PTO shaft (8) and the input shaft (53) of the work machine (R) are connected by the transmission shaft (37), the working machine connection side ends of the both connection links (11) are connected to each other by a connecting member ( 13), and the left and right side portions of the connecting member (13) are connected to the working machine (R) so as to be releasably connected to the working machine (R) by an approaching operation to the working machine (R). A leaf spring (31) fixed to both left and right sides of the member (13) and directed toward the center side is provided, and the leaf spring (31) supports a support case (29) at a center portion in the left-right direction. 29) is located at either the front or back via a straight line connecting the left and right fixed positions of the leaf spring (31), and is located at the other of the front and the back through elastic deformation of the leaf spring (31). The operating mechanism (83) for changing the position of the support case (29) in the front-rear direction is changeable. A connection shaft (34) is rotatably supported by the support case (29), the connection shaft (34) is connected to the transmission shaft (37), and the operation mechanism (83) is provided. ) Configures a clutch (59) that is connected / disconnected to / from the input shaft (53) by changing the front-rear position of the support case (29). When the clutch (59) is connected, the coupling shaft (34 ) And the input shaft (53) are aligned with each other.
A device for connecting a tractor and a working machine, which is provided with.