JPS606182Y2 - Midmount mower power transmission device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a power transmission device for a midmount mower.

As is well known, a mid-mount mower that is mounted on a tractor is equipped with a transmission box that receives power from the tractor's PTO shaft and transmits it to the cutter. It is installed on a slightly raised area nearby, that is, on the front deck that removes the cut material diagonally backwards, and the power is transmitted by a pulley and belt to the cutter main shaft installed at a distance to the rear of the box. It was composed of
655 咥 Official Gazette).

Since the box is mounted on a somewhat high deck, the total height of the mower is quite high, and there are restrictions on how the mower can be raised, making it easy to damage the mower while running, and it is difficult to maintain a sufficiently high cutting height. This is something that could not be done.

In addition, the cutter main shaft is independent and requires a separate vertical transmission shaft in the transmission box, which is disadvantageous in terms of cost, and the mechanical efficiency of driving a belt between these two shafts is also low. Moreover, since a tension mechanism is required for this transmission system, it becomes even more disadvantageous in terms of cost, and there is also the hassle of adjusting the tension mechanism and replacing the belt.

Therefore, it has been proposed to use both the cutter main shaft and the transmission shaft to directly transmit power to the cutter main shaft (1983).
-124934 specification).

However, in this case, since the PTO shaft of the tractor and the main cutter shaft are driven by a belt, the transmission device is complicated, and there is a risk that grass or the like may get wrapped around the belt.

Therefore, it is possible to combine the above two conventional examples and provide a power receiving gear box at the upper end of the cutter main shaft, but above the transmission pulley for driving the other cutter shaft,
If a power receiving gear box is provided, its installation height will be high, which will hinder the vertical movement of the motor 7.

Therefore, the present invention was devised to solve the above problems, and its feature is that a plurality of cutter shafts in vertical axes are attached to the mower frame attached to the abdomen of the tractor body. It is rotatably inserted and supported, one of which is attached to the tractor's PT.
In a mid-mounted mower in which power is transmitted from the O-axis as the main shaft and the cutter shafts are interlocked and connected by a belt transmission means, the upper end of the cutter main shaft that protrudes upward from the mower machine frame is The cutter main shaft is rotatably supported by a transmission box supported by a frame, and an input shaft that receives power from the PTO shaft within the transmission box is interlocked with the cutter main shaft through a gear. A predetermined gap is formed between the upper surfaces of the machine frame, and a transmission pulley for interlocking another cutter shaft is fixed to the cutter main shaft within the gap, and the transmission pulley is a saucer-shaped sheet metal pulley having a recess that opens upward. The lower end of the transmission box is recessed into the recess of the pulley.

This invention will be explained below with reference to an illustrated example.

What is shown in FIGS. 1 to 4 is an example of a mid-mounted mower in which a rotary mower M is mounted on the abdomen of an agricultural tractor.

1 is the body of a tractor, and as is well known, it is an integrated frame with an engine at the front and a transmission case 2 connected to the rear. A drive type front wheel 5 is mounted via an axle holder 4.

-In the large diameter section, there are fenders on the left and right sides with seat 6 in the center.
It is equipped with seven rear wheels 8, and a lift arm 9 which is hydraulically mounted and moves up and down is pivotally supported in the center of these wheels.

Reference numeral 10 denotes a fixed bracket mounted symmetrically in the middle between the front and rear of the tractor, and is formed by combining three upper and lower plates.

The lower end of this bracket 10 is long in the front and back, and fixing pins 11 with their axes directed in the front and back are distributed on the left and right sides of the bracket 10, and a pantograph-type lifting link mechanism 12 is connected to the bottom end of the bracket 10.
It consists of:

This mechanism 12 extends and contracts up and down by a lifting wire 13 connected between it and the lift arm 9.

Four lower ends of the mechanism 12 are pivotally connected to the mower frame 14.

As is well known, the front end of the machine frame 14 is formed into an arrowhead shape, and a slightly elevated discharge guide path 15 is formed on both sides of the outer end, and the rear upper surface thereof is a lower horizontal surface.

As shown in FIG. 4, a transmission box 17 is fixed to the front center of this lowered horizontal plane via a stay 16, and this box 17 is connected to a T.
It is shaped like a letter.

The lower end of the vertical barrel 17a is located slightly above the plane of the machine frame 14, and thus the upper and lower ends of the barrel 17a are
A cutter main shaft 18 which is supported by a shaft at a certain point projects downward inside the machine frame 14 through a bearing case 19 fixed to the machine frame 14, and a cutter 21 with a protective cover 20 attached to the lower end thereof.
The splines can be freely joined together.

In this way, the other pair of cutters 21 on both sides are configured to be interlocked by the belt 23 via the tension pulley 22, and in this case, the space formed between the transmission box 17 and the machine frame 14 is used to rotate the cutters 21 around the cutter main shaft 18. A sheet metal transmission pulley 24 is fixed, and a corresponding sheet metal transmission pulley 24 is also fixed to the paternal cutter shaft 25.

This pulley 24 has a saucer-shaped base plate 24a at one end in the axial direction, and a V-shaped belt receiving groove 24b is integrally formed from the outer periphery of the base plate through an overlapping portion.

On the other hand, a driven pinion 26 for receiving rotational force is fixed to the upper end of the power ivy main shaft 18, and a driving pinion 27 for this is fixed to the end of a pinion shaft 28 supported on the forward barrel 17b. The power is transmitted vertically downward.

This power from the front is driven by the engine's crankshaft, from which it is transmitted downward through the front transmission case 29, and is transmitted to the rear pinion shaft through the telescopic unipartial joint 30. 28.

The mower M is driven in this way, and the device for adjusting the cutting height of the cutter 21 configured in this mower M is explained here. 31 is a pair of front gauge wheels on the left and right, and 32 is a rear gauge wheel in the center. A front stay 33 is erected on both sides of the front end of the machine frame 14, and a first link fixed fulcrum shaft 34 in the horizontal axis direction is provided at the upper end of the front stay 33, and a second link fixed fulcrum shaft 35 is provided halfway at the bottom thereof. .

The front gauge wheel 31 is of a caster type, and its vertical shaft 36 is rotatable within the receiving tube 37, and a connecting plate 38 at the back of the receiving tube 37 is provided with movable support shafts 39 and 39 at two upper and lower points. By doing so, two rows of parallel links 1 are formed in the upper and lower directions.

The upper link in this parallel link is the long front main link 40
The rear end can be raised and lowered by a contact lever 41 and a link 42 that transmits the rotation of the lever 41 as vertical movement, and can be adjusted to an appropriate height by a lever lock base 43 with a wave-shaped lock groove. You can lock it with

In this way, the front gauge wheel 31 is adjusted up and down.
The left and right sides are interlocked by extending the 11th J link fixing point shaft 34 over a long span.

On the other hand, the rear gauge wheel 32 can be adjusted up and down through a rear main link 44 and a link shaft 45.

According to the present invention, the transmission pulley is made of sheet metal and shaped like a saucer with a recess opening upward, and the lower end of the transmission box is inserted into the recess, so that the installation height of the transmission box relative to the machine frame is reduced. can be kept low, and the vertical range of the mower can be widened.

[Brief explanation of the drawing]

Figure 1 is a side view of a tractor with a mid-mount mower showing an example of this invention. FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, and FIG. 4 is an enlarged sectional view of the transmission device. 1... Tractor body, 14... Mower machine frame, 17... Transmission box, 18...
Cutter main shaft, 21...Cutter, 24...
・Transmission pulley, 26... Driven pinion, 27.
... Drive pinion, 28 ... Pinion shaft,
30...Universal joint, M...
··more.

Claims (1)

[Claims for Utility Model Registration] A plurality of cutter shafts 18, 25 in a vertical axis posture are rotatably inserted and supported in a mower frame 14 attached to the abdomen of the tractor, one of which is attached to the tractor. The main shaft 18 to which power is transmitted from the PTO shaft, and each cutter shaft 18
, 25... In the mid-mounted mower M, which is interlocked and connected by a belt transmission means, the cutter main shaft 18 projects upwardly from the mower frame 14.
The upper end portion is rotatably supported by a transmission box 17 supported by the machine frame 14, and inside the transmission box 17, P
The input shaft 28 that receives power from the TO shaft and the cutter main shaft 18 are interlocked and connected via gears 26 and 27, and furthermore, a predetermined gap is formed between the lower end of the transmission box 17 and the upper surface of the machine frame 14. A transmission pulley 24 for interlocking other cutter shafts 25 is fixed to the cutter main shaft 18 in the gap, and the transmission pulley 24 is a saucer-shaped sheet metal pulley having a concave portion opening upward. A power transmission device for a mid-mount mower, characterized in that a lower end portion of the transmission box 17 is recessed into a recessed portion 24.