JPS6219803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mid-mount mower mounting device for mounting a mid-mount mower below a tractor body so that the mid-mount mower can be raised and lowered.

This type of mounting device has one end of a parallel link pivotally connected to the front and rear of the mid-mounted mower, and the other end of this parallel link pivotally connected to the lower part of the tractor body, so that it can be raised and lowered with one set of parallel links. There is something to be attached to.

By the way, in addition to a gauge wheel for adjusting the cutting height, a mid-mount mower is usually equipped with a limit gauge wheel to prevent damage to the cutter from convex parts of the field, and these gauge wheels are installed at the front of the mower. They are located either at the front or at the rear.

For this reason, when the mower is placed on the ground, the limit gauge wheel side is lower than the other side, making it impossible to place it horizontally. As a result, one parallel link can be easily connected to the tractor body, but the parallel link on the limit gauge wheel side must be connected while lifting the mower.

US patent No.
There is one disclosed in the specification of No. 3948025. In this conventional device, the tip of the limit gauge wheel-side parallel link is pivotally connected to an eccentric position of a disc, a lever is provided on a rod fixed to the center of the disc, and the rod is engaged with a hook provided on the tractor body. In addition, by rotating the lever, the parallel link is pulled through the disc, and the limit gauge wheel is slightly lifted, so that the mower can be set in a horizontal state.

In this conventional device, all parts other than the hook, such as the rod, disc, and lever, are attached to parallel links, and the parallel links are heavy and are not easy to attach or remove. This is an obstacle when inserting the mower below the tractor body.

In view of the problems of the conventional device, the present invention provides a mechanism that facilitates the attachment and detachment of the parallel link and the arrangement of the mower below the tractor body by providing a traction mechanism having a lever and an arm on the tractor body side. The purpose of the present invention is to provide a mounting device for a domount mower.

A feature of the present invention for achieving this object is that a mid-mounted mower having a limit gauge body on one of the front and rear sides is mounted so as to be movable up and down below the tractor body using front and rear parallel links. In a mounting device for a mid-mounted mower, in which a traction mechanism is provided between a parallel link on the side to which the vehicle is attached and a tractor body, the traction mechanism is rotatably supported with respect to the tractor body and can be fixed at a rotated position. and an arm that is capable of engaging and disengaging from the parallel link, is rotatable integrally with the lever, and pulls up the parallel link by rotating in an engaged state.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3, 1 is a four-wheel drive agricultural tractor, and a tractor body 5 is composed of an engine 2, a clutch housing 3, a transmission case 4, and the like. a frame 6 fixed to the front in a protruding manner;
It includes a radiator 7 placed on the frame 6, a front power extraction device 8 provided at the lower front end of the frame 6, and the like.

The front power extraction device 8 receives power from the crankshaft of the engine 2 via a transmission shaft 9, and extracts power from an extraction shaft 11 via a belt transmission means 10. 12 is a tension pulley that also serves as a clutch.

Reference numeral 14 indicates a front wheel differential device, 15 indicates left and right front axle cases, 16 indicates a front wheel, and 17 indicates a bonnet. Reference numeral 18 indicates a hydraulic system disposed at the rear upper part of the transmission case 4, and reference numeral 19 indicates a rear wheel.

The mid-mount mower 22 is located below the tractor body 5 and approximately midway between the front wheels 16 and the rear wheels 19, and is attached to the tractor 1 via a mounting device 23 to accompany the tractor 1. Therefore, it can be lifted upward from the ground position.

The mower 22 is provided with three sets of rotating cutters 25, and a gear case 26 is provided above the center cutter 25, and the left and right cutters 2 are connected to the left and right cutters 2 from this gear case 26 via a power transmission means such as a belt.
Rotational power is transmitted to 5. An input shaft 27 protrudes forward from the gear case 26.
7 is operatively connected to the take-out shaft 11 via a universal joint 28. At the front of the mower 22, there are limit gauge wheels 29 in the center and on the left and right sides.
A pair of height-adjustable gauge wheels 30 are arranged on the left and right sides at the rear, allowing the mowing height of the mower 22 to be adjusted.

The lifting device 24 uses a hydraulic device 18 as a power source, and the vertical movement of the lift arm 32 is controlled by a wire 33.
The bell crank 34 is rotated through the bell crank 34, and the rotation is transmitted to the bell crank 36 through the rod 35, which further raises and lowers the mower 22 through the chain 37. That is, when the lift arm 32 is moved upward, the mower 22 rises, and when the hydraulic pressure of the hydraulic system 18 is released, the mower 22 descends due to its own weight until it touches the ground. The bell cranks 34 and 36 are pivotally supported by brackets 38 and 39, respectively.
8 and 39 are bolted to the lower part of the tractor body 5.

The mounting device 23 has a front parallel link 41 , a rear parallel link 42 , and a traction mechanism 43 for towing and connecting the front parallel link 41 to the tractor body 5 . Each of the parallel links 41 and 42 consists of two link members spaced apart from each other on the left and right sides.

As shown in FIG. 4, the rear parallel link 42 has its lower end pivotally connected to a bracket 44 fixed to the rear upper part of the mower 22 via a pin 45, and its upper end connected to the clutch housing 3 or transmission case 4.
It is pivotally connected via a pin 47 to a bracket 46 bolted to the lower side wall of the housing, and at least one of the upper and lower ends is removable.

The lower end of the front parallel link 41 is pivotally connected via a pin 49 to a bracket 48 fixed to the front wall of the mower 22, and this bracket 48 may be provided apart from the support plate 50 of the central limit gauge wheel 29. However, as shown in FIG. 3, it is preferable to connect the support plate 50 to the support plate 50 so as to reinforce each other.

Two link members 41a of the front parallel link 41,
41b has a turnbuckle 51 in the middle thereof so that its length can be adjusted freely, and the upper ends are connected to each other by a rod 52. An engagement pin 53 is provided to protrude inward from this upper end.

In Figures 1, 2, 3, 5, and 6, the traction mechanism 4
3 is supported by a case 8a of the front power take-off device 8 fixed to the frame 6, and 56 is a pair of left and right brackets that are welded or bolted to the case 8a in a rearwardly protruding manner, and a rotation shaft 57 rotates. It is movably supported, and a pair of left and right arms 5 are attached to this rotation shaft 57.
8 and one lever 59 are fixed.

Each arm 58 has a hook portion 58a at its tip,
An engagement pin 53 of the front parallel link 41 is removably engaged with this hook portion 58a.

One end of the lever 59 is fixed to the rotating shaft 57, and the other end projects forward by the case 8a, and a locking means 60 is provided in the middle thereof. 6
Reference numeral 1 denotes an L-shaped locking pin which slidably passes through the lever 59 and is guided by a holder 62, to which a stopper 63 is welded. A spring 64 is fitted onto the lock pin 61 between the holder 62 and the stopper 63.
is pressed against the case 8a side. Locking means 60
In addition to these, the case 8a includes a pin hole 65 drilled in the case 8a, and when the lever 59 is rotated from the solid line position to the imaginary line position in FIG. 65, the lever 59 is fixed in the rotational position. The locking means 60 is released by pulling the locking pin 61 against the spring 64 and removing it from the pin hole 65.

The rotation of the lever 59 causes the arm 58, which rotates together with the lever 59, to rotate from the solid line position in FIG. 5 to the imaginary line position in FIG. L is towed, and the front parallel link 41 is pulled up and the rear parallel link 42 is pulled up.
The mower 22 is parallel to the limit gauge wheel 2.
9 is in a horizontal state where it is slightly lifted.

Next, the mower mounting operation in the present invention will be explained.

Mower 22 connected only with rear parallel link 42
is inserted downward from the side of the tractor 1, and then the universal joint 28 and the front parallel link 41 are connected to the mower 22, the rear parallel link 42 is connected to the bracket 46, and the chain 37 of the lifting device 24 is connected to the mower 22. Connect each.

Before installation, the limit gauge wheel 29 of the mower 22 is in contact with the ground, and the mower 22 is in a downward-sloping shape.
The front parallel link 41 cannot be connected to the tractor body 5 unless the front part of the tractor body 5 is lifted. However, even in this state, by placing the lever 59 in the solid line position in FIG. 5, the arm 58 approaches the front parallel link 41, and the engagement pin 53 can engage with the hook portion 58a. After the engagement pin 53 is engaged with the hook portion 58a, when the lever 59 is rotated to the imaginary position in FIG. Pull it forward and pull up the rear end.

The upper end of the front parallel link 41 is located above the mower 22, and the rear part of the mower 22 is located above the rear parallel link 4.
2 and the gauge wheel 30, so only the front part of the mower 22 is slightly lifted, the limit gauge wheel 29 rises, and the mower 22 becomes approximately horizontal. Become.
In this state, the front parallel link 41 is connected to the rear parallel link 4.
2, and the lever 59 becomes unrotatable as the locking pin 61 of the locking means 60 is locked in the pin hole 65, and the horizontal working posture of the mower 22 is maintained, completing the apparatus.

To remove the mower 22, the lock pin 61 is pulled out from the pin hole 65 against the spring 64 while the lever 59 is rotated to the solid line position in FIG. 5, and the front portion of the mower 22 is lowered until the limit gauge wheel 29 touches the ground. In this way, the mounting operation can be performed in the opposite direction.

The traction mechanism 43 pulls the parallel link 41 to pull up the rear end of the mower 22, which is lowered on the limit gauge wheel 29 side due to the limit gauge wheel 29 being in contact with the ground before mounting, to a horizontal state. If the limit gauge wheel 29 is placed at the rear of the mower 22, it may be installed between the rear parallel link 42 and the tractor body 5, and the limit gauge wheel 29 side of the mower 22 can be lifted up. This can also be done by moving the upper end of the parallel link 41 upward or forward and upward, and the rotation trajectory of the tip of the parallel link 41 when the limit gauge wheel 29 touches the ground is different from the rotation trajectory of the hook portion 58a of the arm 58. It is good if they intersect. Further, although both the left and right arms 58 are fixed to the rotation shaft 57, it is also possible to integrally mold one arm 58 with the lever 59. Furthermore, locking means 6
0 has the lock pin 61 on the case 8a side, and the pin hole 6
5 may be provided on each lever 59, or a hook-like lever hook may be provided on the case 8a. Note that the gauge wheels 29 and 30 are not limited to rings, and may be gauge bodies such as sleds.

According to the present invention described in detail above, the traction mechanism 43 connecting the parallel link 41 on the limit gauge wheel 29 side of the mounting device 23 for mounting the mower 22 to the tractor body 5 and the tractor body 5 is connected to the arm 58, the lever 59, etc. The tractor body 5 consists of
Since the parallel link 41 is provided on the side, it is only necessary to form an engaged part (engaging pin 53) that is engaged with the hook part 58a of the arm 58 on the parallel link 41. It is much lighter than the conventional one and has no obstacles, so it is extremely easy to connect to the mower 22 and engage with the traction mechanism 43.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are a side view and a front view of the mower installed,
Figure 3 is an explanatory plan view before the front parallel link is connected, Figure 4
The figure is a perspective view showing the connection structure of the rear parallel link.
The figure is a side view of the traction mechanism, and FIG. 6 is a cross-sectional explanatory view of the traction mechanism when the mower has been installed. 5... Tractor body, 8... Front power take-off device, 22... Mid-mount mower, 23... Mounting device, 24... Lifting device, 29... Limit gauge wheel, 30... Gauge wheel, 41... Front parallel link, 42... Rear parallel link, 43... Traction mechanism,
53... Engagement pin, 57... Rotating shaft, 58... Arm, 58a... Hook portion, 59... Lever, 6
0... Locking means.

Claims (1)

[Claims] 1. A mid-mounted mower 22 having a limit gauge body 29 on one of the front and rear sides is connected to the front and rear parallel links 4.
1, 42, a mounting device for a mid-mounted mower, which is mounted in a vertically movable manner below the tractor body 5, and has a traction mechanism 43 between the parallel link 41 on the side where the limit gauge body 29 is located and the tractor body 5; The traction mechanism 43 includes a lever 59 that is rotatably supported on the tractor body 5 and can be fixed at the rotated position, and the parallel link 41.
A mounting device for a mid-mount mower, comprising an arm 58 which is freely engageable and detachable from the lever 59 and rotatable integrally with the lever 59, and which pulls up the parallel link 41 by rotating in the engaged state.