JPS6231520A - Power transmission device for tractor - Google Patents

Abstract

PURPOSE:To make a gear change at the time of a rear wheel speed change ever so easy, by attaching an engine, having each output shaft in front and the rear, to a rear part of an undercarriage, and constituting a power input shaft for the front output shaft and the attached farm working machine so as to cause the rear output shaft and a travel driving machine input shaft each to be driven by a pulley. CONSTITUTION:An engine 4, projecting both output shafts 2 and 3 in front and in the rear, is mounted on the rear part of an undercarriage 1, while a belt driving mechanism 10, consisting of a tension clutch 16 and a belt 15, is installed interposingly between the front output shaft 2 and an input shaft 8 of driving mechanism for a power takeoff shaft 7 for driving an attached far working machine. Likewise, the belt driving mechanism 10 is installed interposingly between the rear output shaft 3 and an input shaft 6 of a travel driving mechanism transmitting power to rear wheels 5 as well. With this constitution, a revolving speed change in these rear wheels and the like gets off with a gear change alone inside a transmission case 9 so that changing operation comes so easy.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a tractor transmission.

Conventional technology and problems to be solved by the invention An engine with its output shaft facing backward is mounted at the rear of the machine base, and a traveling transmission mechanism is installed below the engine to transmit power to the left and right rear wheels. and a transmission mechanism that transmits power to the power take-off shaft.The input shaft of the tractor is provided with a transmission case that protrudes rearward, and belt transmission is performed from the output shaft to the input shaft. It is separated into a path for transmitting power from the input shaft to the rear wheels via gears, etc. and a path for transmitting power to the power take-off shaft.For example, either the rotational speed of the rear wheels or the rotational speed of the power take-off shaft, Or, if it becomes necessary to change the speeds of both, the gears in these transmission mechanisms must be replaced, and this change is not easy.

Means for Solving the Problems This invention provides an engine (4) having output shafts (2) and (3) on the front and rear sides at the rear of the chassis (1), and On the lower side, an input shaft (8) of a transmission mechanism that transmits power to a power take-off shaft (7) for driving the mounting machine protrudes forward, and the left and right rear wheels (5) (
A transmission case (9) is provided in which the input shaft (6) of the traveling transmission mechanism that transmits power to the drive transmission mechanism (5) projects rearward, and the front output shaft (
2), a front input shaft (8), a rear output shaft (3), and a rear input shaft (6), respectively, with respective belt transmission mechanisms (10) (10). The configuration of the transmission device.

Functions and Effects of the Invention The front output shaft (2) of the engine (4) is connected to the belt transmission mechanism (10), the front input shaft (8), and the transmission in the transmission case (9). ! The power is transmitted to the power take-off shaft (7) via the lI411 structure, and the rear output shaft (3) is connected to the belt transmission mechanism (10),
The power is transmitted to the left and right rear wheels (5) (5) via the rear input shaft (6) and the traveling transmission mechanism inside the transmission case (9).

When changing the rotation speed of either or both of the rear wheels (5) (5) and the power take-off shaft (7), the gears in the traveling transmission mechanism inside the transmission case (9) and There is no need to replace gears or the like in the transmission mechanism, and only the pulleys of the front, rear, or both belt transmission mechanisms (IO) need to be replaced, which has the effect of facilitating this replacement operation.

Embodiment In the illustrated example, a handle boss (with a steering handle (11) at the upper end pivotally supported above the front end of the vehicle chassis (1))
(12) is provided protrudingly, and on the chassis (1) behind this handle post (12), a driver's seat (13) is provided for the passenger, and on the rear end of this chassis (1). is equipped with an engine (4) having front and rear output shafts (2) and (3) that protrude forward and rearward, respectively.

Also, below this engine (4), there are left and right rear wheel axles (14).
) A transmission case (9) in which a traveling transmission mechanism for transmitting power to (14) and a transmission mechanism for transmitting power to a power take-off shaft is sandwiched between the chassis (1), and at the rear of this transmission case (9), The input shaft (6) of the travel transmission mechanism projects rearward, and the human power shaft (6) and the output shaft (3) on the rear side are connected to each other by tightening and loosening the bell (15). Power is transmitted by a belt transmission mechanism (10) having an intermittent tensicon clutch (16). Also, the transmission case (9)
The input shaft (8) of the transmission mechanism is projected forward from the front part of the transmission mechanism, and the input shaft (8) and the output shaft (2) on the front side are connected to each other.
) is transmitted by a belt transmission mechanism (10) having a tension clutch (18) for intermittent transmission of the bell) (15), and a pair of umbrellas are transmitted from the transmission mechanism in the transmission case (9). A power take-off shaft (7) is made to protrude downward via a gear or the like.

On the lower side of the front part of the vehicle chassis (1), the control handle (1
1) A pair of left and right front wheels (18) (18)
are provided, and left and right rear wheels (5) (5) are fixed to the left and right rear wheel shafts (14) (14).

The left and right front wheels (18) (18) and the left and right rear wheels (5)
(5), a grass cutting device 21 (17) equipped with a cutting blade that rotates to cut grass is suspended from the chassis (1), and the upper part of this grass cutting device ff1 (17) is suspended from the chassis (1). , a transmission shaft (18) that transmits power to the cutting blade is provided to protrude upward;
8) and the power take-off shaft (7) are transmitted through a belt (20). (21) is a gauge roller that adjusts the grass cutting height, and (22) is a front roller that supports the front part of the grass cutting device (17).

Note that (23) is a radiator that cools the cooling water of the engine (4), (24) is a cooling fan that cools the radiator (23) and the outer periphery of the engine (4), and (25) is a fan that drives the cooling fan (24). It's a belt.

Next, the effect will be explained. When the tension clutch (1B) is turned on, the output shaft (3) on the rear side of the engine (4) is connected to the belt transmission mechanism (10), the input shaft (6), and the running transmission mechanism in the transmission case (9). The power is transmitted to the left and right rear wheel axles (14) (14) and the left and right rear wheels (5) (5) through the tractor to drive the tractor.

Furthermore, when the tension clutch (16) is turned on, the output shaft (2) on the front side of the engine (4) is connected to the belt transmission mechanism (10), the input shaft (8), and the transmission case.
”□ The power take-off shaft (7) is connected via the transmission mechanism in the space (9).
: further bell) (20) through mowing 42 (
1? ) to cut the grass by rotating the transmission shaft (19) and the cutting blade.

FIGS. 3 and 4 show another embodiment, in which the input shaft (6) of the travel transmission mechanism protrudes forward from the front part of the transmission case (9), contrary to the configuration described above. The input shaft (6) and the output shaft (2) on the front side of the engine (4) are interlocked by the belt transmission mechanism (10). A gear case (2B) has an input shaft (8) projecting from above and a power take-off shaft (7) projecting in a direction perpendicular to the input shaft (8), and has a transmission mechanism such as a bevel gear inside. The military case (26) is configured such that the protruding direction of the power extraction shaft (7) can be changed at least to the left, right, or downward, and the input shaft (8) and the rear of the engine (4) The side output shaft (3) is interlocked with the belt transmission mechanism (10).

With this configuration, when the power take-off shaft (7) is directed downward, the mowing device (17) disposed in front of the rear wheels (5) (5) can be belt-transmitted as described above. ,
Belt transmission can also be carried out to a working machine installed behind the rear wheels (5) (5), and depending on the transmission form of the working machine installed further behind, the power take-off shaft (7) can be moved to the left. You can respond by changing the direction to the left or right.

Figure 5 shows the cutting blade of the above-mentioned ramie cutter (17), which has a hole (27) fixed to the transmission shaft (19) in the center and cutting blades (28) at both ends. A plate-shaped cutting blade (29) is formed, and a mounting surface portion (30) having a mounting hole (30) is provided on two sides of the cutting blade (29) near the middle of the fixing hole (27) and both ends. A plate-shaped blade (33) (33) consisting of a blade (31) and an upwardly facing upright surface (32) is fastened with a plurality of screw members (34) (34). The mounting surface portion (31) and the upright surface portion (32)
The attachment hole (35) provided in the cutting blade (29) can be changed as needed to change the angle between the blade piece (33) and the attachment hole (27). The configuration can be changed by

[Brief explanation of drawings]

The figures show an embodiment of this IJI. Fig. 1 is a side view, Fig. 2 is a partial rear view, and Fig. 3 is a different embodiment.
FIG. 4 is a rear view, and FIG. 5 is a partial side view. In the figure, code (1) is the chassis, (2) and (3) are the output shafts, and (4
) is the engine, (5) is the rear wheel, (6) and (8) are the input shaft,
(7) shows the power take-off shaft, (9) shows the transmission case, and (10) shows the belt transmission mechanism.

Claims (1)

[Claims] At the rear of the chassis (1), there are output shafts (2) (3) on the front and rear sides.
), and an input shaft (8) of a transmission mechanism is provided on the lower side of the engine (4), and an input shaft (8) of a transmission mechanism that transmits power to a power take-off shaft (7) for driving the attached work machine is installed on the front side. A transmission case (9) is provided in which the input shaft (6) of the traveling transmission mechanism that transmits power to the left and right rear wheels (5) (5) projects to the rear side, and the front output shaft (2) ), front input shaft (8), and rear output shaft (3) and rear input shaft (6), each belt transmission mechanism (10) (1
0).