JPS6244189Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a binder sub-transmission device with excellent operability.

In so-called traveling work vehicles such as tractors, construction vehicles, earthmoving vehicles, and various agricultural machinery, the transmission mechanism is
A structure in which pulleys of different diameters are attached to two shafts, and a belt looped around each pulley is tensioned or loosened is often adopted due to its simple design.

However, this configuration has the disadvantage that the number of shift levers is equal to the number of belts, making operation complicated and making the area around the levers feel stiff and stiff.

Therefore, this idea makes effective use of a one-way clutch and allows gear shifting to be performed using only one lever.

Hereinafter, a case where this invention is applied to a binder will be explained with reference to the drawings.

Fig. 1 is a side view of the binder, Fig. 2 is a side view of the sub-transmission device of the binder, Fig. 3 is a developed cross-sectional view, and Figs. 4 and 5 are side views of main parts showing the operating state. However, in the case of a binder or the like, this idea is applied to the auxiliary transmission 3 from the engine 1 to the transmission 2.

That is, two pulleys 5 and 6 are fixed to the output shaft 4 of the engine 1, and two pulleys 8 and 9 are also attached to the input shaft of the transmission 2. 1
0 and 11 are tensioned and loosened by tension clutches 12 and 13 to obtain speed changes.

By the way, in this invention, in addition to interposing a one-way clutch 14 between the input shaft 7 and the low-speed side pulley 8,
Tension clutches 12 and 13 with one lever 1
It can be operated with 5.

Tension clutches 12 and 13 each have a tension roller 1 at the tip of tension arms 17 and 18 that are configured to be rotatable around a support shaft 16.
The other ends of the tension arms 17 and 18 are linked with linking tools 21 and 22, and the other ends of the linking tools 21 and 22 are connected to the support shaft 2.
The arm levers 24 and 25 are connected to arm levers 24 and 25 that can rotate around 3.

Cams 27 and 28, which can also rotate around a support shaft 26, are provided near the arm levers 24 and 25, and the cams 27 and 28 are integrated with the lever 5 described above.

The tension arms 17 and 18 are biased toward the slack side of the belts 10 and 11 by a spring 29, and the lever 15 is fitted into a guide 30 that guides and regulates its own movement. There is.

In addition, in the binder, another pulley 31 is fixed to the pulley 8 on the low speed side, and this serves as an output pulley for transmitting power to the reaping section and the like.

Next, the lever 15 and the tension clutch 12,
To explain the relationship between cams 27 and 28,
are arranged in parallel to the support shaft 26 in the form shown in FIGS. 4 and 5.

FIG. 4 shows the case of tensioning and loosening the belt 10 on the low speed side. When the lever 15 is in position a (power cutoff position), the operating surface 27a of the cam 27 does not act on the arm lever 24, and the Therefore, the arm lever 24 is in the position A in which the tension clutch 12 is not operated (no power is connected). However, when the lever 15 is operated to position b (low speed position), the action surface 27a of the cam 27 is moved to the arm lever 2.
4, the arm lever 24 is rotated to the position B, the tension roller 19 tensions the belt 10, and the low speed side power is connected.

FIG. 5 is an explanation of tensioning and loosening the belt 11 on the high-speed side. When the lever 15 is in positions a and b, the action surface 28a of the cam 28 does not act on the arm lever 25, but the lever 15 comes to position c (high speed position), the working surface 28a of the cam 28
comes into contact with the arm lever 25, and the arm lever 25
Rotate the tension roller 20 from C to D.
pushes the belt 11, and the high-speed side power is connected.
Therefore, at this time, low and high power are connected simultaneously, but since the one-way clutch 14 described above is interposed in the power transmission path on the low speed side, the input shaft 7 is connected to the low speed side. The one-way clutch 14 slides on the pulley 8, and only the power on the high-speed side is transmitted (therefore, the one-way clutch 14 is installed in this direction).

Since this invention has the above-mentioned structure and functions, the following effects can be expected.

1 By configuring the reaping part to be transmitted from the pulley 8 on the low speed side, the reaping work is always
This is done when the machine is running at low speed, completely preventing the accidental mowing operation from occurring at high speed and clogging important parts. (Note that reaping work itself is difficult unless the vehicle is driven at low speed.)

2. When starting, the vehicle always starts from a low speed, so the risk of sudden start can be avoided.

3 There is no need to disengage the work clutch each time when going around during reaping work or when moving during non-work.
Since the working part is stopped at the same time as the clutch is switched at high speed, these operations can be performed quickly and easily.

4. Since the low-speed belt also rotates during high-speed operation via the one-way clutch, there is no abnormal noise caused by the belt on the low-speed side, and there is no need to adjust the belt presser or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention. Fig. 1 is a side view of a binder when this invention is applied to a sub-transmission device of the binder, Fig. 2 is an enlarged side view of the area around the sub-transmission device, and Fig. 3 is a side view of the binder. is also a developed cross-sectional view, No. 4
FIG. 5 is a side view of the main parts showing the operating state of this invention. Code, 3... Sub-transmission device, 4... Output shaft, 7...
...Input shaft, 5, 6, 8, 9...Pulley, 10, 1
1...Belt, 12, 13...Tension clutch, 14...One-way clutch, 15...Lever.

Claims (1)

[Scope of utility model registration request] A plurality of pulleys 5, 8, 6, 9 are attached to the output shaft 4 and input shaft 7, respectively, and belts 10, 11 are looped around each of the pulleys 5, 8, 6, 9. In the binder sub-transmission device in which the speed can be changed by selectively turning on and off tension clutches 12 and 13 that tension and release tension, the reaping portion is configured to be transmitted from the lower speed pulley 8 of the pulleys, and further A one-way clutch 14 is provided in the low-speed transmission path, and the tension clutch 1 can be operated by operating a single lever 15.
2 and 13 are configured to be able to switch the power from cutting off to the low speed side and from the low speed side to the high speed side, and when switching to the high speed side, the low speed side pulley 8 receives the input from the one-way clutch 14. 1. A sub-transmission device for a binder, characterized in that a speed change from low speed to high speed can be obtained while rotating with power to the low speed side cut off by sliding on a shaft.