JPS6119615Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mid-mount type rotary mower device that is attached to the abdomen between the front wheels and the rear wheels of an agricultural tractor.

A rotary mower is a mowing device for mowing pastures, mowing lawns, etc., and is often attached to the abdomen of an agricultural tractor. Various mounting methods have been used in the past, but the drive force extraction part is the PTO shaft at the rear of the transmission case,
Front held by front axle bracket
Since there are only two locations, the PTO pulley, the V-belt must be used to drive the vehicle from that location, and improvements have been made to support methods for the V-belt and pulley.

Furthermore, various methods have been devised to lift the tractor from the ground surface when not in use, depending on the relationship with the driving V-belt and the belly of the agricultural tractor.

The present invention particularly relates to a method for attaching a rotary mower to the abdomen of an agricultural tractor.

The abdomen of an agricultural tractor is a narrow space, and it is necessary to work in an unstable position to place the rotary mower in this area, and it is difficult to lift the rotary mower device and attach it to the abdomen of the agricultural tractor. It is a labor-intensive job. Conventionally, as shown in Japanese Utility Model Application Publication No. 50-2837, the parallelogram-shaped link devices that support the rotary mower were pivotally supported at the upper ends of each to the bracket on the tractor side using pins. It is necessary to match the pin hole on the bracket side with
Inserting and removing the pins in the narrow and dark area of the tractor's belly was troublesome.

In the present invention, a tying fitting is provided on the abdomen of the tractor to hold the upper link part of the link device of the rotary mower, and then the tying fitting is rotated upward around a pivot pin to provide a lever. The idea is to use this principle to attach a lightly operated lifting rotary mower device to the abdomen of an agricultural tractor.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a diagram showing a mid-mount type rotary mower installed on the abdomen of an agricultural tractor.

An engine 2 is disposed inside a bonnet 1, and a front axle bracket 3 protrudes forward from the lower side surface of the engine 2. A front wheel differential device 14 is supported on the front axle bracket 3 via a center pin, and a front wheel drive shaft 15 is inserted into the front wheel differential device from the transmission case 6.
Front axles project from the front wheel differential device 14 to the left and right, and the front wheels 4 are supported at the ends of the front axles. A clutch housing 5 is fixed to the rear surface of the engine 2, and a transmission case 6 is further fixed to the rear surface of the clutch housing 5. The mounting device of the mid-mount type rotary mower of the present invention is mounted on the front axle bracket 3 at the front and the clutch housing 5 at the rear, and the power is transmitted from the front motor stored inside the front axle bracket 3.
Obtained from PTO pulley 21.

The conventional mid-mounted rotary mower is
Power was extracted from the PTO shaft 9 at the rear of the transmission case using a special pulley and gear box, but this was difficult to install and difficult to hang with the belt, so this idea was improved. .

Rear axle housings are provided on both sides of the transmission case 6, and rear axles 7, 7 are supported on the rear axle supported by the rear axle housing.

A hydraulic case 10 is provided on the upper surface of the transmission case 6, and a seat 11 is further provided above the hydraulic case 10. 8
1 is a three-point link type work machine mounting device, and 12 is a steering handle.

FIG. 2 is a side sectional view showing the power take-off part, FIG. 3 is a front view of the power take-off part, and FIG. 4 is a plan sectional view.

The rotation speed of the engine placed inside the bonnet 1 is taken out by the clutch shaft and
A PTO shaft 20 is used, and a front PTO pulley 21 is constantly rotated between the front axle bracket 3.

V-pulleys 23 and 24 are provided in order to extract power for horizontal rotation from the front PTO pulley 21,
The V-belt 19 is twisted at right angles.

A bracket 31 is fixedly attached to the front axle bracket 3, mounting pins 28, 29, and 30 of the belt cover 13 are taken out from the bracket 31, and the belt cover 13 is inserted into these mounting pins and fixed with fixing screws 32. . Similarly, the mounting bracket 25 of the V-pulley 23 protrudes from the bracket 31, and the other mounting bracket 26a pivotally supports a bracket 26b, so that the V-pulley 24 also serves as a tension pulley. always spring 33
The V pulley 24 is pressed against the V belt 19 by a. 33 is a spring adjustment screw.

27 is a belt guide rod.

FIG. 5 is a drawing showing a support device for a rotary mower. FIG. 6 is a plan view of the support device.

The brackets 16, 16 are fixed to the front axle bracket 3, and the brackets 17, 17 are fixed to the sides of the clutch housing 5. The brackets 16 and 17 are permanently fixed on the tractor side, and J-shaped pins 37 and 42 are provided to enable the rotary mower to be removed.
The rotary mower can be removed by operating these two J-shaped pins 37, 42. A lifting lever 34, a lever guide 51, a lever shaft 56, and a lever arm 36 are integrally fixed on the bracket 16 side. By being movably rotated, the lever arm 36 can be rotated up and down via the lever shaft 56.
An engaging portion for fixing the rotary mower in the raised state is provided at the rear end of the groove 51.

Insert the long side of the J-shaped pin 37 into the hole 36b of the lever arm 36, insert the short side of the J-shaped pin 37 into the hole 36a, and insert the pine needle pin into the hole 37a of the long side of the J-shaped pin. Insert it into the lever arm 36,
The spring 37c is inserted and the pine needle pin is inserted into the hole 37b again. With this structure, J-shaped pin 3
7 is always attracted to the lever arm 36.

The arc portion of the J-shaped pin 37 serves as a handle,
Holding this part, pull out the short rod of the J-shaped pin, and insert the long hole part of the arm 76 into the lever arms 36, 3.
6 and insert the short J-shaped pin into hole 36 again.
The arm 76 portion can be connected by inserting it into a.

The links 45, 45 and the base 54 of the turnbuckle 39 are connected to the bracket 17 by connecting the front end to the engagement cam 75, centering around a pivot pin 43c in which the binding fitting 43 is loosely fitted into the hole 17e of the bracket 17.
By engaging and disengaging from a, the link 44,
The shafts 53 and 52 fixedly attached to the bracket 44 are released from the binding state between the binding fitting 43 and the bracket 17, and the connection is released. In this operation, the engaging camshaft 75 is connected to the J-shaped pin 42 through the long hole 7 through the pin 42e.
5c and is configured to be slidable,
By pulling out the short rod 42c from the hole 17f of the bracket 17 against the spring 42d and rotating the J-shaped pin 42 in the hole 17g, the pin 42 is removed.
The cam shaft 75 and the engagement cam 75a rotate through the coupling member 43, and the engagement cam 75
e comes off. As a result, the tying fitting 43 opens around the pivot pin 43c, and the shafts 52, 53, which were positioned by the reinforcing plates 17a, 43a shown in FIGS. 13 and 16 and held in the recesses 17d, 43d, are freed. Ru.

A pin 42e is inserted and fixed into the J-shaped pin 42 shown in FIG. 12, and a fixing pin of a spring 42d is inserted into the hole 42b.

A clutch pedal mounting portion is fitted into the recess 17a of the bracket portion 17 shown in FIG. 17c,
43b is a reinforcing plate.

As shown in FIGS. 24 and 25, metal fittings 53a and 53b are fixed to the shaft 53 for positioning the brackets 17, 17 and the fitting fitting 43 so that they cannot be moved from side to side. It is set up.

Furthermore, the base portion 54 of the turnbuckle 39 is also loosely fitted.

The rotary mower device is supported on the bracket 17 by a parallel four-point link device with four integrally formed links of turnbuckles 39, links 44, links 45, and brackets 49 and 50, and the upper and lower portions of the four-point link devices are is performed by rotating the lift lever 34.

Furthermore, a long hole 76a is opened on the arm 76 side at the connection part between the arm 76 and the J-shaped pin 3 of the lever arm 36 using a short rod. The structure is such that it can be freely lifted by the length of this elongated hole 76a when something is caught between the two.

The turnbuckle device 39 consists of a rotating grip portion 40, a fixing nut 41, a base portion 54, etc., and by adjusting these, the quadrilateral shape of the four-point link device can be changed and the angle of the rotary mower with respect to the ground surface can be adjusted.

FIGS. 7 to 11 are drawings of the rotary mower device.

Three booleys 46, 58, 60 are arranged on the cover 18 of the rotary mower device, and a V-belt 57 is suspended through a tension pulley 59. The pulley 46 is a double pulley, and the drive V-belt 19 is suspended on the upper stage, and the V-belt 57 is suspended on the lower stage.

A rotary blade 67 is attached to the lower end of the shaft of each pulley.
68 and 69 rotate in the same direction.

The cut grass is then discharged from the discharge port 64 to the outside of the tractor running path. The discharge port 64 is the eleventh
64 in FIG. 11 by the handle 56 as shown.
is adjusted to the position.

A pulley cover 73 covers the V belt 57 and the V pulleys 58 and 60.

47, 48 are rollers for keeping the minimum distance between the rotary blades 67, 68, 69 so that they do not come into contact with the ground, and the tail wheels 61, 61 are the tail wheel levers 63.
This is a device for adjusting the height of cutting from other surfaces by adjusting the height. The locking pin 63a engages with the engagement groove 62a of the lever guide 62 to lock the positions of the tail wheels 61, 61.

The lock pin 63a is always held in an engaged state by a spring 63b. 71 is an arm of the tension pulley 59.

As described above, in the present invention, the bracket 17 having the recess 17d on the lower side is attached to the abdomen of the agricultural tractor, and the tying metal fitting 43 having the recess 43d on the upper surface is attached at one end to a part of the bracket using the pivot pin 43c. The other end of the binding fitting 43 can be rotated up and down, and the left and right upper links 4 of the parallelogram-shaped link device that supports the rotor mower are connected.
4 and 44 can be engaged in a tied state between the recess 17d of the bracket 17 and the recess 43d of the binding fitting 43, and then configured to prevent rotation of the binding fitting 43, and is shaped like a parallelogram. Since the link mechanism is fixed to the bracket 17, the following effects are achieved.

First, when a parallelogram link device is pivotally supported on the tractor body side, as disclosed in the prior art Japanese Utility Model Application Publication No. 50-2837, the upper ends of the two links are usually connected with pins. It needs to be pivoted to the bracket, and the links are on the left and right, so
It is pivoted by inserting and removing four pins. Furthermore, in order to fix the four pins, it is necessary to insert four other pine needle pins.

On the other hand, in the present invention, the left and right links 44.
4 are connected by the shafts 52 and 53, and the parts are held and fixed by the recess 17d of the bracket 17 and the recess 43d of the binding fitting 43, so only one point is required for fixing.

Secondly, the tie fitting 43 is a pivot pin 43
First, the shafts 52 and 53, which are the connecting brackets of the links 44 and 44, can be rotated about the center of the shafts 52 and 53.
After the bracket 17 is inserted, the end of the fitting 43 can be rotated to bring it closer to the bracket 17, and at this time, due to the principle of leverage, only a small operating force is required to push up the end of the fitting 43. Therefore, when attaching a rotary mower to the underside of a tractor, which is difficult for an operator to operate, no strength is required and attachment and detachment can be easily performed.

[Brief explanation of the drawing]

Figure 1 is a side view of a rotary mower installed on an agricultural tractor, Figure 2 is a side cross-section of the power take-off part, Figure 3 is a front view of the power take-off part, and
5 is a side view showing the mounting device of the rotary mower, FIG. 6 is the same plan view, FIG. 7 is a plan view of the rotary mower device, FIG. 8 is a side sectional view, and FIG. The drawings show the tension pulley 59, Fig. 10 is a rear view of the rotary mower, Fig. 11 shows the discharge port, Fig. 12 shows the J-shaped pin 42, Fig. 13,
14 and 15 are drawings of the bracket 15, FIGS. 16 and 17 are drawings of the tying fitting 43,
Figure 18 is a drawing of the J-shaped pin 37, Figure 19,
Figure 0 is a plan view, a side view, and a 21st view of the lever shaft 56.
Figures 22 and 23 are drawings of the arm 76, Figures 24 and 25 are plan views and side views of the shafts 52 and 53 link 44, and Figures 26 and 27 are the cam shaft 7.
5 is a rear sectional view and a side view of the vehicle. 16, 17...Bracket, 18...Rotary mower device cover, 21...Front PTO pulley, 34...Elevating lever, 37, 42...J
shaped connecting pin, 39... turnbuckle, 44,
45... Link, 43... Binding metal fittings.

Claims (1)

[Scope of utility model registration request] A bracket 17 having a concave portion 17d at the bottom is attached to the abdomen of the agricultural tractor, and a concave portion 4 is attached to the top surface.
3d holding fitting 43, pivot pin 4
3c, one end is connected to a part of the bracket, the other end of the tying metal fitting 43 can be rotated up and down, and the left and right upper links 44, 44 of the parallelogram link device supporting the rotary mower are connected. The parts are configured to be able to be engaged in a tied state between the recess 17d of the bracket 17 and the recess 43d of the binding fitting 43, and then to prevent rotation of the binding fitting 43, and a parallelogram link mechanism is attached to the bracket 17. A rotary mower attachment device for an agricultural tractor, characterized in that it is fixed.