JPS6321441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agricultural machine, such as a riding rice transplanter or a tractor, in which various working machines such as a seedling planting device or a tiller are connected to a running vehicle body. This invention relates to a hitch device for removably connecting a working machine in a state where it can be rolled freely, and more specifically, to connect a working machine to a traveling vehicle body in a state where it can be freely rolled and detached.
The purpose is to make it reliable and strong with extremely simple operation.

Next, a drawing will be explained in which an embodiment of the present invention is applied to a riding-type rice transplanter. In the drawing, reference numeral 1 indicates a running vehicle body, and the running vehicle body 1 is attached to a vehicle body frame 2 and its front part. It consists of two front wheels (not shown) and two rear wheels 4 that are attached to the rear via axle cases 3, 3.A driver's seat 5 is provided on the upper surface of the vehicle body frame 2, and the front upper surface of the vehicle body frame 2 is The vehicle is configured to travel forward by driving the two rear wheels 4 with an engine (not shown) mounted on the vehicle.

Reference numeral 6 indicates a seedling planting device located at the rear of the traveling vehicle body 1, and the seedling planting device 6 includes a transmission case 7,
A plurality of planting cases 8 are integrally extended rearward at appropriate intervals laterally from the transmission case 7, and each of the planting cases 8 is attached to the lower surface of each planting case 8 so that its front end can freely move up and down. It consists of a floating float 9 and a seedling stand 10 whose upper end is inclined so as to approach the traveling vehicle body 1. On both left and right sides of each planting case 8, seedlings are placed from the seedling pine on the seedling stand 10. After dividing each plant, a vertically swinging type seedling planting mechanism 12 is provided on both sides of each of the floats 9 to plant the seedlings in the field area 11, and the seedling platform 10 has a transmission mechanism at its lower end. A trochanter 16 is fitted into a seedling retrieval guide rail 13 attached to the top surface of the case 7, and a trochanter 16 is attached to a support arm 15 that stands up from the transmission case 7 on a rail 14 provided midway on the back surface thereof.
are fitted together and configured to reciprocate in the left and right lateral directions.

The hitch 17 attached to the rear end of the traveling vehicle body 1 has a pair of upper and lower links and a pair of left and right links 18 of equal length.
19 are pivotally connected at their base ends with pins 20 and 21 to constitute a parallel link mechanism 22 for raising and lowering the seedling planting device, and the tips of the equal length links 18 and 19 in the parallel link mechanism 22 are connected to the It is pivotally connected to the connecting body 23 for the seedling planting device 6 using pins 24 and 25 at the same vertical distance as the base end pivot pins 20 and 21.

A hollow connecting shaft 26 is integrally provided on the connecting body 23 so as to extend substantially horizontally in the rear direction (in the direction of the seedling planting device 6). The transmission cases 7 of No. 6 are connected in a rollable and detachable manner via a hitch device 27 which will be described in detail later, while the parallel link mechanism 22
A hydraulic cylinder 28 is mounted between one of the links 18 and the vehicle body frame 2, and the seedling planting device 6 is moved by the hydraulic cylinder 28 to the traveling vehicle body 1.
It is configured to be raised and lowered from the side.

Reference numeral 29 indicates a support bracket for the preliminary seedling stand, and the support bracket 29 has a boss portion 29' at the lower end of the support bracket 29 connected to the connecting body 2 with respect to the connecting shaft 26.
3 and the hitch mechanism 27, so that it can be freely rolled separately from the traveling vehicle body 1 and the seedling planting device 6.

At the upper end of this support bracket 29, a pair of upper and lower links 30, 31 of equal length and a pair of left and right links are pivotally connected by pins 32, 33 so as to extend in the direction of the traveling vehicle body 1, while both upper and lower links 30, 31 between the tips of the pivot pins 32, 3 to the support bracket 29.
Pins 34 and 35 at the same spacing as the top and bottom spacing of 3.
By connecting via a connecting link 36 pivoted at
A hydraulic cylinder 38 for lifting and lowering is installed between the pin 34 and the pin 33 on this parallel link mechanism 37, and a pair of left and right lower links 30, 3
A shaft 39 mounted between the ends of the vehicle body 1 is placed on a stand 40 erected from the body frame 2 of the traveling vehicle body 1, while a pair of left and right upper links 30, 3
1 is mounted on a shaft 41 mounted between the ends of the vehicle body 1, there is an elevating and lowering inclined table 4 for use as a preliminary seedling stand, which is arranged approximately horizontally on the upper part of the traveling vehicle body 1.
2 is rotatably attached, and a spare seedling stand 43 for placing spare seedling mats to be supplied to the seedling stand 10 is mounted on the upper surface of the elevating and lowering slope table 42.
4 and 45 so as to be able to freely reciprocate laterally in parallel with the seedling table 10, and the tip of the lifting/lowering table 42 and the shaft 3 of the lower link 31.
A hydraulic cylinder 46 for tilting the lifting/lowering table 42 is installed between the lifting and lowering ramps 9 and 9.

In this case, the parallel link mechanism 22 for lifting and lowering the seedling planting device and the parallel link mechanism 37 for lifting and lowering the preliminary seedling stand.
are congruent quadrilaterals, and the links are parallel to each other, and when the seedling planting device 6 is raised and lowered, the shafts 39 and 41 at the ends of both the upper and lower links 30 and 31 in the parallel link mechanism 37 for raising and lowering the preliminary seedling stand are is configured so that it does not move up and down or back and forth, and a preliminary seedling stand 43 is provided at the upper end of the support arm body 15 erected from the transmission case 7 of the seedling planting device 6 along the back surface of the seedling stand 10. When the upper links 30 and 31 of the parallel link mechanism 37 come into contact with each other, the stopper body 4 is raised by the hydraulic cylinder 38.
7 are provided in pairs on the left and right.

The hitch device 27 includes a bowl-shaped connecting member 48 that rotatably fits onto the connecting shaft 26 of the connecting body 23 attached to the traveling vehicle body 1 side, and a bowl-shaped connecting member 48 that rotatably fits on the connecting shaft 26 of the connecting body 23 attached to the traveling vehicle body 1 side, and a seedling planting device 6 that is an embodiment of the working machine. A bracket 49 is attached to the side surface of the transmission case 7 on the vehicle body side, and engagement and disengagement mechanisms 50 and 51 are provided between the connecting member 48 and the bracket 49.

That is, on both the upper and lower outer surfaces of the connecting member 48,
Two protrusions 51, 51, 52, 52 are integrally protruded, and each protrusion 51, 52 is provided with grooves 53, 54 having a substantially semicircular cross section in a direction perpendicular to the axial direction of the connecting shaft 26. The bracket 49 has a bottom plate 49' that is in close contact with the transmission case 7, and side plates 49'', 49'' that protrude from the bottom plate 49' to the left and right sides of the connecting member 48. The top surface of the connecting member 48 is in contact with the bottom plate 49' over the entire circumference, so that the inside of the connecting member 48 is sealed, and the side plates 49'', A pair of upper and lower hit shafts 55, 56 are provided at both upper and lower ends of the 49'' to fit into grooves 53, 54 in the respective protrusions 51, 52 of the connecting member 48.
are rotatably supported so as to extend parallel to each other and perpendicular to the axis of the connecting shaft 26, and a handle 5 is provided at one end of each of the hitch shafts 55, 56.
7 and 58 are fixed to each other, and both hit shafts 55 and 56 are configured to be able to rotate 180 degrees by operating the handles 57 and 58, respectively or in conjunction with each other.

The hitch shafts 55 and 56 each have the projections 5 and 56.
By providing notches 55' and 56' at locations corresponding to 1 and 52, grooves 53 and 56 in each protrusion are formed.
When the portions 55'', 55'' that fit into the connecting member 54 are formed to have a substantially semicircular cross section, and the hit shafts 55, 56 are rotated 180 degrees, the hit shafts 55, 56 are connected to the connecting member 4.
It is configured to be removed from the grooves 53 and 54 on the 8 side.

Incidentally, positioning cam collars 59 and 60 are fitted to the hitch shafts 55 and 56 between the protrusions 51 and 52, respectively, so as to come into contact with the opposing inner surfaces of the protrusions 51 and 52. , both cam collars 5
Slanted surfaces 59' and 60' are provided on both the left and right side surfaces of the protrusions 9 and 60 so that the width dimension (t) is narrower than the spacing dimension (T) between both protrusions.
0' is in the same phase as the notches 55', 56' in the hitch shafts 55, 56, thereby making both the hitch shafts 55, 56 have semicircular cross sections 55'',
When the cam collars 56'' are rotated so as to fit into the grooves 53 and 54, the left and right side surfaces of both the cam collars 59 and 60 are configured to come into contact with the inner surfaces of the respective protrusions 51 and 52. Both hitch shafts 55, 56 are attached to the handles 57, 58 of both hitch shafts 55, 56,
A mechanism (not shown) is provided to hold the semicircular cross-sectional portions 55'', 56'' in the rotational positions in which they fit into the grooves 53, 54.

A transmission clutch shaft 61 is rotatably supported in the hollow connecting shaft 26 via a ball bearing 62, and the clutch shaft 61 is extendable and bendable to a PTO shaft 63 at the rear end of the traveling vehicle body 1. While connected via a shaft 64, a drive shaft 65 for various drive parts in the seedling planting device 6 is supported on the same axis as the clutch shaft 61 in the transmission case 7 of the seedling planting device 6. A driven clutch 66 is fixed, a driving clutch 67 that is fitted to the clutch shaft 61 by spline engagement is slidably inserted into the hollow shaft 26, and a spring that engages the driving clutch 67 with the clutch shaft 61 is inserted into the hollow shaft 26. 6
At 8, remove the snap spring 69 at the tip of the clutch shaft 61.
The driven clutch 66 is configured to be pressed and biased so as to come into contact with the driven clutch 66 and engage with the driven clutch 66.

In this configuration, from the traveling vehicle body 1 to the seedling planting device 6
When separating the two, by rotating both hitch shafts 55, 56 in the hitch device 27 by 180 degrees from the state shown by solid lines in FIG. The semicircular cross-sectional parts 55'' and 56'' that fit into the grooves 53 and 54 are
Cam collars 59, 60 on both hitch shafts 55, 56, their dimensions (t)
rotates so that its narrow part is positioned between the protrusions 51 and 52, and a gap is created between the protrusions 51 and 52. In this state, either the traveling vehicle body 1 alone is moved forward or the seedlings are planted. By reversing the device 6, the clutch 67 on the transmission clutch shaft 61 on the traveling vehicle body 1 side and the clutch 66 on the drive shaft 65 on the seedling planting device 6 side are disengaged, and the seedling planting device 6 is moved to the traveling vehicle body. 1
separated from

To connect the seedling planting device 6 to the traveling vehicle body 1, either the hitch shafts 55 and 56 are disconnected as described above and the traveling vehicle body 1 is moved backward, or the seedling planting device 6 is driven. By bringing it closer to vehicle body 1, etc.
After inserting the connecting member 48 between the hitch shafts 55 and 56 so that its tip end is in contact with the bottom plate 49' of the bracket 49, the hitch shafts 55 and 56 are placed in the state shown by the solid line in FIG. By rotating,
Each cross-sectional semicircular part 55'', 5 in both hitch axes
6'' fit into the grooves 53, 54 in the respective protrusions 51, 52 of the connecting member 48, the connecting member 48 can be connected to the bracket 49 via both hit shafts 55, 56, and the connecting member 48 can be connected to the traveling vehicle body 1 here. The seedling planting device 6 is connected thereto, and the driving clutch 67 and the driven clutch 66 are engaged to connect the power transmission mechanism.

In this case, since the connecting member 48 is rotatably fitted onto the connecting shaft 26 provided on the connecting body 23 on the side of the traveling vehicle body 1, it is possible to attach the connecting member 48 to the traveling vehicle body 1. The transplantation device 6,
It is possible to connect the connecting shaft 26 in a rolling manner, and even if there is a tilt difference between the traveling vehicle body 1 and the seedling planting device 6 during the connection, it can be corrected by rotating the connecting member 48. It is possible to connect them while doing so.

In this connection, in order to facilitate insertion of the connecting member 48 into both hitch shafts, the connecting member 48 must be
What is necessary is to provide sloped surfaces 48' and 48' on the top and bottom surfaces of the tip of 8. In addition, in the meshing connection of both clutches 67 and 66 when connecting the seedling planting device 6,
If both clutches 66, 67 are not slidable with respect to their respective axes 65, 61, then both clutches are placed in an engaged position such that the pawls on one clutch are located between the pawls on the other clutch. If the phases are not aligned, the clutch pawls will become jammed and the seedling planting device cannot be connected to the vehicle body, and if you try to force the connection, you will damage the clutch pawls. As shown in FIG. With this configuration, even when the claws of both clutches 66 and 67 come into contact, one clutch will retreat against the spring, so the seedling planting device can be connected in this state, and after the connection, the transmission clutch By rotating either the shaft 61 or the drive shaft 65, both clutches will automatically engage under spring force.

As described above, the present invention provides an agricultural machine in which a working machine is detachably connected to a running vehicle body, in which a connecting body attached to the running vehicle body is provided with a connecting shaft extending in the direction of the working machine, and the coupling shaft is provided with a connecting shaft extending in the direction of the working machine. A connecting member is rotatably fitted onto the shaft, while a bracket is attached to the working machine side, with which the tip end surface of the connecting member comes into contact;
The bracket rotatably supports a hitch shaft extending in a direction perpendicular to the connecting shaft at both left and right portions sandwiching the connecting member, and protrusions provided on both left and right side surfaces of the connecting member include projections. , grooves are carved into which both the hit shafts fit, and furthermore, the sections of the hit shafts that fit into the grooves are shaped so that the hit shafts are removed from the grooves when the hit shafts are rotated. It is characterized by its semicircular shape, which allows various working machines such as seedling planting equipment to be connected to the traveling vehicle body in a rolling manner around the connecting shaft, and when connected. By inserting the connecting member on the traveling vehicle body side between the hitch shafts of the bracket on the work equipment side so that the tip end surface of the connecting member is in contact with the bracket, and then rotating both hitch shafts, Since the traveling vehicle body and the work equipment can be connected even if there is a deviation in inclination, the connection operation is extremely simple and can be done quickly. Since the hit shaft is fitted into the grooves on both the left and right sides of the connecting member when the hitch shaft is in contact with the connecting member, a strong connected state without play can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the main parts of a riding rice transplanter, FIG. 2 is a plan view of FIG. Figure 4 is a cross-sectional view of Figure 3, and Figure 5 is a cross-sectional view of Figure 3.
The figure is a cross-sectional view taken from - in FIG. 3. 1... Running vehicle body, 2... Vehicle body frame, 4...
Rear wheel, 6... Seedling planting device, 7... Transmission case, 8...
...Planting case, 9...Float, 10...Seedling stand, 12...Seedling mechanism, 23...Connection body, 26...
... Connection shaft, 22 ... Parallel link mechanism, 27 ... Hit device, 48 ... Connection member, 49 ... Bracket, 55, 56 ... Hit shaft, 51, 52 ... Projection, 53, 54 ... Groove, 55'', 56''... Semicircular section, 59, 60... Cam collar, 65... Drive shaft, 61... Transmission clutch shaft, 66, 67...
Clutch, 68...spring.

Claims (1)

[Claims] 1. In an agricultural machine in which a working machine is removably connected to a traveling vehicle body, a connecting body attached to the traveling vehicle body side is provided with a connecting shaft extending in the direction of the working machine, and a connecting member is rotated on the connecting shaft. On the other hand, a bracket is attached to the working machine side, with which the distal end surface of the connecting member comes into contact, and the bracket has a bracket that is perpendicular to the connecting shaft at both left and right portions sandwiching the connecting member. A hitch shaft extending in a direction is rotatably supported, and protrusions provided on both left and right sides of the connecting member are provided with grooves into which the hitch shafts fit, and A hitch device for an agricultural working machine, wherein a portion of the hitch shaft that fits into the groove is formed to have a substantially semicircular cross section so that the hitch shaft comes out of the groove when the hitch shaft is rotated.