JPH10191712A - Connection structure for tractor and work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure with excellent front and back balance between a tractor and a rotary work machine. SOLUTION: For this connection structure of the tractor and the work machine, a three-point linking mechanism 3 is connected to the rear part of a car body 4, a connection frame 15 is fixed to the rear end part of the three- point linking mechanism 3 and the work machine 2 is connected to the connection frame 15 at a work machine upper connection point P5 and a work machine lower connection point P6 positioned on the lower side of the work machine upper connection point P5. In the one in which the tractor side connection point P1 of the top link 7 of the three-point linking mechanism 3 is positioned at the upper part of a PTO shaft 489, the PIC shaft 16 of the work machine 2 enters the front part of a virtual line A for connecting the work machine upper connection point P5 and the work machine lower connection point P6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure between a tractor and a working machine, in which a working machine such as a rotary cultivator is mounted on a tractor body via a standard three-point link mechanism.

[0002]

2. Description of the Related Art Conventionally, as a connection structure between a tractor and a rotary cultivator, there is a structure in which a rotary cultivator is mounted on a tractor via a standard three-point link mechanism of European and American styles as shown in FIG. In FIG. 14, a top link 8 of a three-point link mechanism 82 is provided at the rear of the vehicle body 81 of the tractor.
3 is connected to the front connecting portion 84A of the pair of left and right lower links 84, and the rear connecting portion 83B of the top link 83 and the rear connecting portion 84B of the left and right lower links 84 are connected to the connecting frame 85, respectively. An upper connection pin 86 and a pair of left and right lower connection pins 87 of the rotary tiller are connected to the connection frame 85, and a PTO shaft 88 of the tractor body 81 and a PIC shaft 89 of the rotary tiller are connected by a drive shaft 90. It is configured to be.

[0003] The dimensions of the connection point between the three-point link mechanism and the connection frame and the connection point between the connection frame and the working machine are determined by standards (for example, the Nippon Agricultural Standard).

[0004]

Since the conventional standard three-point link mechanism 82 is a parallel link type, the height of the rotary tiller above the ground when the rotary tiller is raised during headland turning or running on the road is increased. The rotary cultivator is far away from the tractor in order to secure the tractor. For this reason,
In the connection structure between the tractor and the rotary cultivator mounted by the conventional standard three-point link mechanism 82, the front-rear balance between the tractor and the working machine is poor, the turning range is wide and the turning property is poor in headland turning, etc. Drawbacks and improvements have been pointed out, such as the large lifting power of rotary tillers.

Accordingly, an object of the present invention is to provide a connecting structure between a tractor and a working machine which solves the above-mentioned problems in the standard three-point link mechanism.

[0006]

The technical measures taken by the present invention to achieve the above object are as follows.
The three-point link mechanism 3 is connected to the rear part of the three-point link mechanism 3, and the connecting frame 15 is fixed to the rear end of the three-point link mechanism 3.
5, a connection point P5 on the working machine and a connection point P5 on the working machine
And a connecting structure of the tractor and the working machine, wherein the working machine 2 is connected to the working machine lower connecting point P6 located below the tractor side connecting point of the top link 7 of the three-point link mechanism 3. When P1 is located above the PTO shaft 49, the PIC shaft 16 of the work implement 2 is
It is configured so as to enter ahead of the imaginary line A connecting the work machine lower connection point P6.

According to the second aspect, the three-point link mechanism 3 is connected to the rear part of the vehicle body 4, the connecting frame 15 is fixed to the rear end of the three-point link mechanism 3, and the working machine 2 is connected to the connecting frame 15. And the tractor-side connection point P1 of the top link 7 of the three-point link mechanism 3 is located above the PTO shaft 49. It is characterized in that the tip of the shaft 16 protrudes forward from the connection frame 15.

According to the third aspect, the three-point link mechanism 3 is connected to the rear part of the vehicle body 4, the connecting frame 15 is fixed to the rear end of the three-point link mechanism 3, and the working machine 2 is connected to the connecting frame 15. Tractor and work implement, the tractor-side connection point P1 of the top link 7 of the three-point link mechanism 3 is located above the PTO shaft 49. The tip of the PIC shaft 16 of the working machine 2 is located on an imaginary line B connecting the machine-side connecting point P3 and the working machine-side connecting point P4 of the lower link 8.

According to a fourth aspect of the present invention, the imaginary line A connecting the work implement upper connection point P5 and the work implement lower connection point P6 is inclined so as to move forward as it goes upward. According to a fifth aspect of the present invention, the distal end of the PIC shaft 16 is located above the work machine-side connection point P4 of the lower link 8. In claim 6, the tip of the PIC shaft 16, the working machine side connection point P4 of the lower link 8, and the work machine lower connection point P4.
6 are arranged in a triangular shape in a side view, and the working machine side connection point P4 of the lower link 8 is located at a middle position in the front-rear direction between the tip end of the PIC shaft 16 and the work machine lower connection point P6.

According to claim 7, the gear case 17 of the working machine 2 is provided.
Is inclined so as to move forward as it goes upward. In claim 8, the working machine 2
Is a rotary cultivator, wherein the PIC shaft 16 is inclined forward and downward in a ground contact state. The ninth aspect is characterized in that a constant velocity universal joint 51 connected to the PTO shaft 49 is provided on the tractor side of the drive shaft 50 for interlocking the connection between the PTO shaft 49 and the PIC shaft 16.

According to a tenth aspect, the work machine lower connection point P6 is:
It is characterized by being located substantially on the axis of the PIC shaft 16 in side view. In the eleventh aspect, the three-point link mechanism 3 is connected to the rear part of the vehicle body 4, the connecting frame 15 is fixed to the rear end of the three-point link mechanism 3, and the connecting frame 15 is connected to the working machine connecting point P <b> 5. In the tractor-work machine connection structure in which the work machine 2 is connected to the work machine lower connection point P6 located below the work machine upper connection point P5, the work machine upper connection point P5 It is characterized in that the distance from the onboard link point P6 can be adjusted.

According to a twelfth aspect of the present invention, the distance between the upper working machine connection point P5 and the lower working machine connection point P6 is adjusted in a plurality of steps or in a stepless manner. According to the thirteenth aspect, the three-point link mechanism 3 is connected to the rear part of the vehicle body 4, the connection frame 15 is fixed to the rear end of the three-point link mechanism 3, and the work implement 2 is connected to the connection frame 15. In the connection structure between the tractor and the work implement configured as described above, the tractor-side connection point P of the top link 7
1. The three points of the tractor 1 PTO shaft 49 and the tractor-side connection point P2 of the lower link 8 are closely arranged.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a connection structure for connecting a tractor 1 and a rotary tiller 2 exemplified as a working machine via a three-point link mechanism 3. As shown in FIGS. 1 and 2, a work implement lifting / lowering device 5 having a hydraulic cylinder is mounted on a rear portion of a transmission case 4A constituting a part of a vehicle body 4 of the tractor 1, and a bracket is provided on a rear surface of the transmission case 4A. 6 is fixed. The bracket 6 has first to third connecting portions 6 a and 6 formed of pin insertion holes.
b, 6c are formed at intervals in the vertical direction, and a fourth connecting portion 6d formed of a pin insertion hole is formed behind the third connecting portion 6c.

The three-point link mechanism 3 comprises a top link 7 and a pair of left and right lower links 8. The top link 7 is configured to be extendable and contractible in the axial direction by a turnbuckle structure, and is configured to be adjustable in length. A front connecting portion 7F of the top link 7 is connected to a fourth connecting portion 6d of the bracket 6 by a connecting pin. 9, and is pivotally connected to the left and right axes so as to be rotatable around the left and right axes. This portion is a tractor-side connection point P1 of the top link 7.

A connecting portion 8F on the front side of the lower link 8 is pivotally connected to a lower portion of a case 10 fixed to a side surface of the transmission case 4A via a connecting pin 11 so as to be rotatable around the left and right axes. The portion is a tractor-side connection point P2 of the left and right lower links 8. An intermediate portion of each lower link 8 is connected via a lift rod 13 to a lift arm 12 of the work implement elevating device 5, and the three-point link mechanism 3 is rotated by the rotation of the lift arm 12 around the left-right axis.
Are movable up and down around the connection points P1 and P2.

The lower link 8 of the lift rod 13
The connection point to the pin is a pin mounting mechanism, and a plurality of pin insertion holes 14 formed in the lower link 8 are formed in the longitudinal direction. A connection frame 15 is fixed to the rear end side of the three-point link mechanism 3, and the rotary tiller 2 is detachably mounted on the connection frame 15. This rotary tiller 2 has a PIC shaft 1
6 from the gear case 17 projecting forward, the support arm 1
8 is protruded to the left and right, a transmission case 19 is fixed to the left support arm 18 and a machine frame is fixed to the side frame to the right support arm 18, and the pawl shaft 20 is rotatable between the transmission case 19 and the lower part of the side frame. And a tilling part 22 configured by mounting a large number of tilling claws 21 on a claw shaft 20.

The tilling portion 22 is covered with a tilling cover 23 on the upper, rear and rear sides, a top mast 24 is fixed on the gear case 17, and a gauge wheel 2 is provided on the rear end side.
5, and a support frame 26 that can swing up and down by extending and contracting a height adjustment mechanism 26 provided between the top frame 24 and the top mast 24 projects rearward from the machine frame.

An upper connecting pin 28 having an axis in the left-right direction is provided at the front upper end of the top mast 24. A connecting bracket 29 is fixed to each of the left and right support arms 18, and each of the left and right connecting brackets 29 is fixed. Are provided with lower connecting pins 30 projecting outward in the left-right direction, respectively. As shown in FIGS. 1 to 5, the connection frame 15 has a main frame 31 formed by a square pipe (or a round pipe, a flat bar, or the like) into a substantially A shape when viewed from the rear. The upper connector 32 is fixed, the lower connector 33 is fixed to the lower part on both left and right sides, the left and right middle portions of the main frame 31 are connected by the upper reinforcement 34 of the same material as the main frame 31, and the left and right lower connector 33 is a flat bar or the like. The upper and lower reinforcing members 34 and 35 are connected by a pair of left and right vertical reinforcing members 36.

A left and right connecting pin 37 is provided on the front upper portion of the upper connecting body 32, and a connecting portion 7R on the rear side of the top link 7 is pivotally connected to the connecting pin 37 so as to be rotatable around a left and right axis. The top link 7 is a working machine side connection point P3. At the rear of the upper connecting body 32, there is formed an upper engaging portion 38 which is concavely formed in an upwardly open shape, and the upper connecting pin 28 of the rotary tiller 2 is mounted on the upper engaging portion 38 from above. This part is rotatably fitted around, and this part is a connection point P5 on the working machine.

A lower connecting pin 39 is provided on a portion of the lower connecting body 33 projecting forward and downward, and is provided with a lower connecting pin 39. The upper connecting pin 39 is provided with a connecting portion 8R on the rear side of the lower link 8 about a left-right axis. The lower link 8 is a working machine side connection point P4. A lower engaging portion 40 is formed at the rear of the lower connecting body 33. The lower engaging portion 40 has
The lower connection pin 30 is rotatably engaged around the left and right axes from behind, and this portion is defined as a work machine lower connection point P6.

The work machine lower connection point P6 is located behind the PIC shaft 16 in a side view as shown in FIG.
The PIC shaft 16 is located substantially on an extension of the axis of the PIC shaft 16. As shown in FIGS. 4 and 5, a lock member 42 is supported by the lower connecting body 33 via a horizontal shaft 41 so as to be rotatable around the left and right axes. The lower connecting pin 30 engaged with the portion 40 can be engaged, and the engagement prevents the connecting pin 30 from the lower engaging portion 40 from being detached.

The lock member 42 is urged by a coil spring 43 in a direction in which it engages with the lower connecting pin 40, and the front portion thereof is connected to a mountain-shaped link 45 of a releasing means 44. The release means 44 is configured as follows.
That is, an arm 47 is pivotally supported by a bracket 46 fixed to the upper reinforcing member 34, a center of a link 45 penetrates through the arm 47 so as to be relatively rotatable, and an operation lever 48 is fixed to the arm 47. Is rotated from the solid line state in FIG. 4 to the two-dot chain line position, the link 45 moves beyond the arm 47, the lock member 42 rotates clockwise, and the engagement with the lower connecting pin 30 is released. It is to be released.

The PTO shaft 49 of the tractor 1 and the PIC shaft 16 of the rotary cultivator 2 are connected to each other by a drive shaft 50, and rotational power from the engine of the tractor 1 is transmitted in the gear case 17 of the rotary cultivator 2. It is input to the mechanism. Gear case 1
Power is transmitted from the drive shaft 7 to the pawl shaft 20 via a transmission shaft in the left support arm 18 and a transmission mechanism in the transmission case 19, so that the pawl shaft 20 is driven to rotate.

As shown in FIGS. 1 to 7, the drive shaft 50 has a constant velocity universal joint 51 composed of two sets of hook type joints connected to a PTO shaft 49 at the front (tractor side).
A universal joint 52 comprising a set of hook-type joints connected to the PIC shaft 16 at the rear (work machine side).
A transmission shaft 53 is interlockedly connected to the yokes of the universal joints 51 and 52, and the transmission shaft 53 is configured to be able to expand and contract in the axial direction.

The yoke 54 of the rear universal joint 52 is supported by a holder 55, and the holder 55 is supported by left and right vertical reinforcing members 36 of the connecting frame 15. The holder 55 includes a cylindrical body 56 that rotatably supports the yoke 54 via a bearing, and a pair of left and right horizontal shaft-shaped support shaft parts 58 fixed to the outer peripheral surface of the cylindrical body 56 via a seat body 57. A shaft support member 60 rotatably fitted to the support shaft portion 58 and having a shaft portion 59.
And

The support shaft 58 is displaced forward or backward from the center of the cylindrical body 56 in the axial direction.
It is arranged parallel to 8 and displaced to one of the front and rear,
Therefore, the shaft support member 60 can be turned back and forth around the support shaft portion 58, and the holder 55 can be changed to two front and rear positions by being turned around. A holding member 61 having a U-shaped cross section is fitted to the shaft supporting member 60 to fix an intermediate portion of the shaft portion 59. The holding member 61 projects from the shaft supporting member 60 to the seat body 57 side. It has a positioning edge 61a, and the seat body 57 has a positioning edge 6
It has a positioning edge 57a that engages with 1a.

The shaft support member 60 is resiliently pressed toward the seat body 57 by a spring 70 fitted on the support shaft portion 58, and rotates while releasing the shaft support member 60 from the seat body 57 against the spring 70. By doing so, the front and rear can be inverted, and the rotation is stopped by the engagement between the positioning edge 61a and the positioning edge 57a at the inverted position. The shaft portion 59 has a rubber bush 63 fitted at the tip thereof. The rubber bush 63 is used as an alternative to the first support portion 65 and the second support portion 66 formed on the left and right vertical reinforcing members 36 via the rubber bush 63. Engaged.

The first support portion 65 is formed at a portion protruding in an inverted hook shape above and behind the longitudinal reinforcing member 36, and the second support portion 6 is formed.
6 is formed in a concave shape at the lower portion of the vertical reinforcing member 36. As shown in FIGS.
The shaft portion 59 is fitted to and supported by the second support portion 66. Before the PIC shaft 16 is fitted into the yoke 54, the holder 55
The PIC shaft 16 is held in a position where the PIC shaft 16 can be easily fitted by the stopper 67 provided on the third member 3.

Next, the work machine mounting operation will be described. Figure 1,
In FIG. 3, the three-point link mechanism 3 is connected to the vehicle body 4 and arranged so that the main frame 31 assumes a forwardly inclined posture in which the main frame 31 is inclined forward as it goes upward. It is arranged on the rear side and engages with the second support portion 66, and the lock member 42 is in a locked state. In this state, the vehicle body 2 is moved backward with respect to the rotary tiller 2 placed on the ground,
The tractor 1 is moved closer to the rotary cultivator 2 so that the upper connection pin 28 of the rotary cultivator 2 is located above the upper engagement portion 38 of the connection frame 15.

Then, the work machine lifting / lowering device 5 is operated to raise the connecting frame 15, the upper connecting pin 28 is engaged with the upper engaging portion 38, and the connecting frame 15 is further raised to lift the rotary tiller 2. As a result, the rotary cultivator 2 moves slightly forward, whereby the lower connecting pin 30 of the rotary cultivator 2 engages with the lower engaging portion 40 of the connecting frame 15 while pushing down the lock member 42, and When the pin 30 is engaged with the lower engaging portion 40, the locking member 42 rotates upward on the rear side by the urging force of the spring 43, and locks the lower connecting pin 30.

On the other hand, when the rotary tiller 2 is lifted and slightly moved forward, the lower connecting pin 30 is
The PIC shaft 16 is spline-fitted to the yoke 54 in the holder 55 in parallel with the engagement of the PIC shaft 16. As described above, the rotary tiller 2 is connected to the connection frame 15 in an inclined shape that shifts forward as the gear case 17 moves upward.

FIG. 1 shows a state in which the rotary tilling machine 2 is in contact with ground before tilling. In this state, the PIC shaft 16 is inclined forward and downward. Thus, the drive shaft 50 is configured to be substantially horizontal, and the bend angle on the rear side of the drive shaft 50 is substantially eliminated or minimized as much as possible, so that the rotational angular velocity is less fluctuated.

When the rotary tilling machine 2 is mounted, the tip of the PIC shaft 16, the working machine side connection point P4 of the lower link 8, and the work machine lower connection point P6 are arranged in a triangular shape in a side view. , The working machine side connection point P4 of the lower link 8 is connected to the tip of the PIC shaft 16 and the work machine lower connection point P6.
And an intermediate position in the front-rear direction. In the above-described configuration, as shown in FIG. 1, the PIC shaft 16 is located forward of the forwardly inclined imaginary line A connecting the work implement upper connection point P5 and the work implement lower connection point P6. With PIC axis 1
The PIC 6 projects forward from the connection frame 15 and has a PIC on a forwardly inclined imaginary line B connecting the work implement side connection point P3 of the top link 7 and the work implement side connection point P4 of the lower link 8.
The tip of the shaft 16 is located, and the PIC shaft 1
6 is located above the working machine side connection point P4 of the rotary 8, and the mounting position of the rotary cultivator 2 is positioned closer to the tractor 1 than the mounting position of the conventional rotary cultivator, whereby The front-rear balance between the tractor 1 and the rotary cultivator 2 is good, the turning range on a headland or the like is small, and the hydraulic pressure of the work implement elevating device 5 (the rotary cultivator 2
The lifting force) is small.

Further, since the tractor-side connection point P1 of the top link 7 is arranged near the upper part of the PTO shaft 49, the rotary cultivator 2 can be mounted on the tractor 1 in comparison with the conventional one.
Even when the rotary tilling machine 2 is moved closer to the side, the position when the rotary cultivator 2 is raised can be taken high, whereby the rotary cultivator 2 can be sufficiently raised by headland turning or the like, It is possible to suppress unstable running of the tractor due to the overhang weight effect during running.

When the rotary cultivator 2 is raised, the drive shaft 50 is bent around the front joint portion. The fluctuation of the rotational angular velocity of the drive shaft 50 due to an increase in the front angle (the angle formed by the transmission shaft 53 and the PTO shaft 49) becomes large, and the load is not applied to the tilling part 22 at the time of ascent. Although noise increases, in the above-described embodiment, since the constant velocity universal joint 51 is employed on the front side of the drive shaft 50, noise caused by fluctuations in the rotational angular velocity can be prevented.

Further, the tractor-side connection point P1 of the top link 7 and the tractor-side connection point P2 of the lower link 8 are defined as P
Since the three points are arranged close to the TO shaft 49 (or the bent portion on the rear side of the drive shaft 50) in a side view, and these three points are arranged substantially in a straight line in the vertical direction, the rotary tiller 2 rises. Drive shaft 5 at the time
It is possible to suppress noise caused by an increase in the angle at the rear side of 0 (the angle formed by the transmission shaft 53 and the PIC shaft 16).

That is, the front bent portion of the drive shaft 50, the tractor-side connection point P1 of the top link 7,
When the tractor-side connection point P2 of the lower link 8 coincides with the tractor-side connection point in the left-right direction, when the rotary cultivator 2 is raised, the rotary cultivator 2 rises about one point in a side view, and the drive shaft 50 Can be raised in a state where the bending angle of the rear bent portion does not fluctuate. However, in practice, it is difficult to match the three points in the left-right direction due to various restrictions, and in this embodiment, They are intensively arranged to match the three points.

In this embodiment, since the connection point of the lift rod 13 to the lower link 8 can be changed and the top link 7 can be extended and contracted, as shown in FIGS. On-machine connection point P5 and work equipment lower connection point P6
It is also possible to mount another type of rotary cultivator 2 having the same distance from the rotary cultivator 2. That is, the connecting point of the lift rod 13 to the lower link 8 is changed, the top link 7 is extended, the position of the connecting frame 15 is lowered, and the vertical position is set. The connection points P6 are changed, and these connection points are configured to be positions where other rotary cultivators 2 can be attached.

In this case, the shaft portion 59 of the holder 55 is arranged on the front side of the support shaft portion 58 and the first support portion 6
5 is engaged. Before the PIC shaft 16 is fitted into the yoke 54, the holder 55 is held in a position where the PIC shaft 16 can be easily fitted by the stopper 68 provided on the vertical reinforcing member 36. 10 to 13 show the connecting frame 15.
In this embodiment, the distance C between the work implement upper connection point P5 and the work implement lower connection point P6 can be changed and adjusted so that a plurality of types of rotary cultivators having different intervals C can be attached. It is composed. This eliminates the need to replace the connecting frame for each different type of rotary tiller, facilitates the installation of the rotary tiller, and eliminates the need to prepare a connecting frame for each different type of rotary tiller. It has the effect of being a target.

FIG. 10 shows a structure in which a screw shaft 70 is fixed to the lower surface side of the upper connector 32, and this screw shaft 70 is
5 is vertically penetrated through the upper central portion of the connection frame 5, and the screw shaft 70 is arranged by a pair of upper and lower nuts 71 that are disposed so as to vertically sandwich the upper central portion of the connection frame 15 and screwed to the screw shaft 70. By fixing, the upper connecting body 32 is attached to the upper center side portion of the connecting frame 15 so as to be vertically adjustable, and by adjusting the upper and lower positions of the upper connecting body 32, the upper connecting body 32 is connected to the working machine connecting point P5. The distance C from the on-board connection point P6 can be changed and adjusted steplessly.

In FIG. 11, a rod 72 is fixed to the lower surface side of the upper connecting body 32, and this rod 72 is connected to the connecting frame 1.
The rod 72 is fixed by penetrating the upper central portion of the upper frame 5 and the upper reinforcing member 34 in the vertical direction, and inserting the pin 73 through the rod 72 and the upper central portion of the connecting frame 15 and the upper reinforcing member 34. Further, by forming a plurality of pin insertion holes 74 formed in the rod 72,
The distance C between the work implement upper connection point P5 and the work implement lower connection point P6 can be changed and adjusted stepwise.

Reference numeral 75 denotes a retaining pin. In this case, since the position adjustment of the upper connecting body 32 is stepwise, there is an effect that it is not necessary to make a mistake in the position of the connecting point P5 on the working machine. The one shown in FIG.
2, a screw portion 72a is formed on the upper side of
a is screwed into the upper central portion of the connection frame 15.

In this case, when the position of the upper connector 32 is adjusted, the weights of the upper connector 32 and the rod 72 are supported by the connector 15, so that there is an effect that the adjustment is easy. The one shown in FIG.
5 is an upper structure 15A and a pair of left and right lower structures 15B.
And the left and right sides of the upper structure 15A are fitted inside the left and right lower structures 15B so as to be slidable in the vertical direction, and both are fixed by pins 76. Further, the left and right lower structures 15B (or By forming a plurality of pin insertion holes 77 formed on the left and right sides of the upper structural body 15A), the interval C between the work implement upper connection point P5 and the work implement lower connection point P6 can be changed and adjusted stepwise. Things.

[0044]

According to the present invention, the working machine approaches the tractor, the front-rear balance between the tractor and the working machine is improved, the range required for turning is small, and the lifting force of the working machine is small. This has the effect of saving time.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing a connection structure between a tractor and a working machine.

FIG. 2 is an overall side view showing a connection structure between a tractor and a working machine.

FIG. 3 is a side sectional view of a connection frame.

FIG. 4 is a side view of the connection frame.

FIG. 5 is a front view of a connection frame.

FIG. 6 is a plan sectional view of a holder.

FIG. 7 is a side view of the holder.

FIG. 8 is a side view showing a mode in which another rotary tiller is mounted.

FIG. 9 is a side sectional view showing a mode in which another rotary tiller is mounted.

FIG. 10 is a side sectional view showing a modification of the connection frame.

FIG. 11 is a front view showing a modification of the connection frame.

FIG. 12 is a partial cross-sectional front view showing a modification of the connection frame.

FIG. 13 is a partial cross-sectional front view showing a modification of the connection frame.

FIG. 14 is a side view of a connection structure between a tractor and a working machine, showing a conventional example.

[Explanation of symbols]

 3 Three-point link mechanism 4 Body 7 Top link 15 Connection frame 16 PIC shaft 49 PTO shaft P5 Work machine upper connection point P6 Work machine lower connection point

Claims (13)

[Claims] 1. A three-point link mechanism (3) is connected to a rear portion of a vehicle body (4), and a connecting frame (15) is fixed to a rear end of the three-point link mechanism (3). )
The connection point (P5) on the work machine and the connection point (P
5) A tractor / work implement connecting structure in which the work implement (2) is connected to a work implement lower connection point (P6) located on the lower side, wherein the three-point link mechanism (3) The tractor-side connection point (P1) of the top link (7) is located above the PTO shaft (49), and the PIC shaft (16) of the work machine (2) is connected to the work machine upper connection point (P
5) A connection structure between a tractor and a work machine, wherein the tractor and the work machine are arranged so as to enter forward of an imaginary line (A) connecting the work machine lower connection point (P6). 2. A three-point link mechanism (3) is connected to a rear portion of the vehicle body (4), and a connecting frame (15) is fixed to a rear end of the three-point link mechanism (3). ) And a work machine (2) connected to the tractor and the work machine, wherein the tractor-side connection point (P1) of the top link (7) of the three-point link mechanism (3) is a PTO shaft. (49), the tip of the PIC shaft (16) of the working machine (2) is connected to the connecting frame (1).
5) A connection structure between the tractor and the working machine, wherein the tractor and the working machine are projected forward. 3. A three-point link mechanism (3) is connected to a rear portion of the vehicle body (4), and a connecting frame (15) is fixed to a rear end of the three-point link mechanism (3). ) And a work machine (2) connected to the tractor and the work machine, wherein the tractor-side connection point (P1) of the top link (7) of the three-point link mechanism (3) is a PTO shaft. (49), on a virtual line (B) connecting the work implement side connection point (P3) of the top link (7) and the work implement side connection point (P4) of the lower link (8). A connection structure between a tractor and a working machine, wherein a tip of a PIC shaft (16) of the working machine (2) is located. 4. An imaginary line (A) connecting the work implement upper connection point (P5) and the work implement lower connection point (P6) is inclined so as to move forward as it goes upward. A connection structure between the tractor according to claim 1 and a working machine. 5. The tractor according to claim 1, wherein the tip of the PIC shaft is positioned above a connection point (P4) of the lower link (8) on the work implement side. Connection structure with work equipment. 6. A triangular arrangement of a tip end of a PIC shaft (16), a working machine side connection point (P4) of a lower link (8), and a work machine lower connection point (P6) in a side view, and 6. The work machine side connection point (P4) of the link (8) is a middle position in the front-rear direction between the tip end of the PIC shaft (16) and the work machine lower connection point (P6). A connection structure between the tractor and the working machine according to any one of the above. 7. The tractor according to claim 1, wherein the gear case (17) of the work machine (2) is inclined so as to move forward as it goes upward. Connection structure with work equipment. 8. The work machine (2) is a rotary cultivator, and the PIC shaft (16) is inclined forward and downward in a ground contact state. Connection structure between the tractor and the working machine. 9. A constant velocity universal joint (5) connected to the PTO shaft (49) is provided on a tractor side of a drive shaft (50) for interlockingly connecting the PTO shaft (49) and the PIC shaft (16).
The connecting structure of a tractor and a working machine according to any one of claims 1 to 8, further comprising (1). 10. A tractor and a work according to claim 1, wherein the work machine lower connection point (P6) is substantially located on the axis of the PIC shaft (16) in a side view. Connection structure with machine. 11. A three-point link mechanism (3) is connected to a rear portion of the vehicle body (4), and a connecting frame (15) is fixed to a rear end of the three-point link mechanism (3). )
The connection point (P5) on the work machine and the connection point (P
5) In a tractor-work machine connection structure in which the work machine (2) is connected to the work machine lower connection point (P6) located below, the work machine upper connection point (P5) and the work are connected. A connection structure between a tractor and a working machine, wherein a distance between the tractor and the working machine can be adjusted. 12. The tractor and the working machine according to claim 11, wherein the distance between the upper working machine connecting point (P5) and the lower working machine connecting point (P6) is adjusted in a plurality of stages or steplessly. Connection structure. 13. A three-point link mechanism (3) is connected to a rear portion of the vehicle body (4), and a connecting frame (15) is fixed to a rear end of the three-point link mechanism (3). ), The tractor and the working machine are connected to each other with a tractor-side connection point (P1) of the top link (7), a PTO shaft (49) of the tractor (1), and a lower. Link (8)
A tractor-side connection point (P2) of the tractor and the working machine.