JPS6112141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a power transmission belt wound around a drive pulley and a speed change pulley in which a pair of pulley members that can move toward and away from each other in the direction of the rotational axis are elastically biased toward each other. In contrast, the working speed of a work machine equipped with a belt-type continuously variable transmission device that brings and releases a tension pulley that can be operated in far and near directions to continuously change the working speed and stop transmission. Regarding the transmission, it is intended to ensure that the low speed is known at the beginning of work so that the gear can be operated reliably.

The working speed changing device mentioned above is designed to reduce the cost of the overall structure by making it possible to perform continuously variable speed and transmission stop using one belt type continuously variable transmission device. , I had the following problem.

That is, for example, if the installed engine unexpectedly stops during work, even if the tension pulley is operated to a position that causes the transmission to stop, the transmission belt held by the speed change pulley will not move outside the speed change pulley in the radial direction. Therefore, there was an inconvenience that the work speed could not be set to a low speed when starting work again. In other words, the belt type continuously variable transmission is capable of changing the winding position of the transmission belt around the transmission pulley as desired only in the transmission state, that is, in the rotation state of the transmission belt. In order to change the position of the transmission belt held between the pulleys radially outward and set it to a low speed, it is necessary to first bring the tension pulley into contact with and press the transmission belt to bring about a high speed state. , it was not possible to set the desired low speed at the start of work.

The present invention has been made with the above-mentioned circumstances in mind, and in a working speed changing device for a working machine having the above-mentioned structure, the speed change pulley is connected to a lower peripheral edge of the winding peripheral edge of the transmission belt. The transmission pulley is positioned so as to be in contact with the transmission pulley, and is further provided with a mechanism for separating the pair of pulley members of the speed change pulley in conjunction with operating the tension pulley to a position where transmission is stopped.

In other words, this mechanism uses a mechanism that separates the pair of pulley members of the speed change pulley, and a configuration in which the position of the speed change pulley is devised relative to the winding periphery of the transmission belt so that the transmission belt hangs down after being released from the pulley members. Therefore, as the tension pulley is operated to the position where transmission is stopped, the winding position of the transmission belt relative to the speed change pulley is changed radially outward.
Even if the engine unexpectedly stops during work, when restarting work,
This allows the work speed to be set accurately to a low speed. As a result, we have achieved a working speed changing device for a working machine that solves the above-mentioned problems and can be used more conveniently as a whole.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a side view of a binder as an example of a working machine, and the front part of the machine is equipped with an engine 1, a traveling transmission case 2, a pair of left and right propulsion wheels 3, a control handle 4, etc. A reaping binding section 5 that pulls up and reaps grain culms planted in a field, binds the reaped grain culms in appropriate amounts, and discharges them toward the outside of the aircraft body.
is equipped with a connection.

As the process progresses, it is configured to automatically and continuously perform the work of harvesting and tying the grain culms planted in the field.

In addition, at the rear of the fuselage, there is a ground idle shaft 6 which is pivotally supported on the fuselage so as to be able to swing horizontally around the vertical axis X.
A driver's seat 7 is supported on the ground, and a ground sled body 8 is provided to support the driver's seat 7 on the ground in place of idle wheels 6 that sink into mud on soft ground.

Next, a device for changing the traveling speed as the working speed will be explained based on FIG. 2 and FIGS. 3A and 3B.

That is, between the output shaft 9 of the engine 1 and the input shaft 10 of the traveling transmission case 2,
A belt-type continuously variable transmission device 12 is provided that continuously changes the traveling speed and stops transmission in accordance with the back and forth swinging operation of a speed change lever 11 that is pivotally supported on the control handle 4 so as to be swingable back and forth. This transmission 12
These include a drive pulley 13 fixed to the output shaft 9, an idler pulley 14 rotatably supported on the machine frame, and a pair of pulley members 15a spline-connected to the input shaft 10 so that they can move toward and away from each other in the direction of the rotation axis. , 15a
A transmission belt 17 is wound around a speed change pulley 15 which is elastically biased toward the speed change lever 11 by a pair of springs 16, 16, and a tensioner is connected to the speed change lever 11 by a wire so that the transmission belt 17 can be operated up and down. The tension pulley 19, which is pivotally supported by the arm 18 and can be operated in the directions of distance and distance with respect to the transmission belt 17, is brought into contact and pressed and released, thereby performing the above-mentioned continuously variable speed and transmission stop. There is.

Further, as a pulley member separation operation mechanism that engages between the pair of pulley members 15a, 15a of the speed change pulley 15 and separates them in conjunction with the operation of the tension pulley 19 to a position where transmission is stopped. A tapered roller 20 is attached to the tension arm 18, and a mechanism for urging the belt 17 radially outward of the speed change pulley 15 by the weight of the transmission belt 17 is constructed.

The pulley member separation operation mechanism 20 may have various forms, such as pulling and moving the pulley members 15a, 15a to separate them, and may be configured in any form.

[Brief explanation of the drawing]

The drawings show an embodiment of the working speed changing device for a working machine according to the present invention, and FIG. 1 is a side view of a binder;
Figure 2 is a side view of the traveling speed transmission device, Figure 3 A,
B is a longitudinal sectional front view showing the mounting part of the speed change pulley. 12... Belt type continuously variable transmission, 13... Drive pulley, 15... Speed change pulley, 15a, 15a...
...Pulley member, 17...Transmission belt, 19...Tension pulley, 20...Pulley member separation operation mechanism.

Claims (1)

[Claims] 1. A transmission belt 17 is wound around a drive pulley 13 and a transmission pulley 15, in which a pair of pulley members 15a, 15a, which can be moved toward and away from each other in the direction of the rotational axis, are elastically biased toward each other. A belt-type continuously variable transmission device 12 that continuously changes the working speed and stops the transmission by pressing and releasing the tension pulley 19 that can be operated in the far and near directions.
The working speed changing device for a working machine is provided with a working speed changing device for a working machine, in which the speed changing pulley 15 is positioned so as to be in contact with a lower peripheral edge of the winding peripheral edge of the transmission belt 17, and the tension pulley 19 is A pair of pulley members 15a, 15 of the speed change pulley 15 are moved in conjunction with the operation to a position where the transmission is stopped.
A working speed changing device for a working machine, characterized in that it is provided with a mechanism 20 for separating a.