JPH0135091Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a backing device for a small mobile agricultural machine.

2. Description of the Related Art As a backing device for a small mobile agricultural machine, for example, the one disclosed in Japanese Utility Model Application No. 58-24548 has been proposed. In this system, a reverse rotation transmission belt is provided in parallel with a forward rotation transmission belt, and both electric belts can be turned on and off alternately using a tension clutch.

Problems to be Solved by the Invention However, the above conventional method not only requires a tension clutch to interrupt the power during backing up, but also requires a belt guide to prevent the belt from rotating when the clutch is "disengaged." The structure becomes complicated,
It had the disadvantage of high cost. In addition, since the tension clutch must be installed on the slack side of the belt, the tension clutch on the reverse transmission belt side must be installed above the belt, which requires a large clutch operation stroke, and the belt cover that covers them is large. The external appearance was also not good.

Means for Solving the Problems Therefore, the present invention provides a small mobile agricultural machine in which the power transmitted from the output shaft of the engine to the transmission input shaft via the transmission belt is turned on and off by operating a tension clutch. A belt transmission body capable of rotating integrally in the vertical direction with the input shaft as a rotation fulcrum is provided in parallel with the transmission belt, and a rotating portion on the tip side of the belt transmission body is pressed against the output shaft side of the engine. By configuring the vehicle to obtain reverse movement power, the above-mentioned conventional problems are attempted to be solved.

Operation When the belt transmission body is rotated in the direction away from the engine output shaft and the tension clutch is turned on, engine power is transmitted to the transmission via the transmission belt and forward (forward rotation) power is generated. In addition, if the tension clutch is "disengaged" and the belt transmission body is rotated in the opposite direction to the above, the leading end rotating portion of the belt transmission body is pressed into contact with the engine output shaft. The power of the engine is transmitted to the transmission via a belt transmission body that rotates in the opposite direction to the engine output shaft and moves backward (reverse rotation).
You can get power.

Embodiment 1 is an engine mounted on a small mobile agricultural machine such as a tailor, and an engine pulley 3 is fixed to the output shaft 2 of the engine 1. Friction wheels 4 are integrally connected. 5 is a transmission case with a built-in transmission, and the transmission input shaft 6 has a pulley 7 for forward rotation (for forward rotation) and a pulley 7 for reverse rotation (for reverse rotation).
A pulley 8 is integrally fixed, and a transmission belt 9 is stretched between the forward rotation pulley 7 and the engine pulley 3. 10 is a tension clutch of the transmission belt 9, 11 is a tension clutch operation lever, 11a is a wire connecting the tension clutch 10 and the operation lever 11, 11b is a tension spring, and 11c is a tension pulley.

By the way, an arm 13 is supported on the mission input shaft 6 via a bearing 12 so as to be freely rotatable in the vertical direction, and a support shaft 14 is attached to the rotating tip of the arm 13.
A pulley 15 is pivotally supported via. A friction wheel 16 corresponding to the friction wheel 4 is integrally connected to the pulley 15, and a transmission belt 17 is tensioned between the pulley 15 and the reversing pulley 8. As a result, a belt transmission body 18 is configured that can rotate integrally in the vertical direction using the transmission input shaft 6 as a rotation fulcrum. 19
is a reverse lever, and the reverse lever 19 is connected to a wire 20.
When the reverse lever 19 is squeezed, the wire 20 is pulled, the arm 13 rotates downward, and the friction wheel 16 is pressed against the friction wheel 4 on the engine output shaft 2 side. I'm starting to do that. 21 is a return spring.

FIG. 5 shows another embodiment, in which the outer peripheral surface of the transmission belt 17 itself of the belt transmission body 18 is brought into pressure contact with the friction wheel 4 on the engine output shaft 2 side. With this configuration, a friction wheel is not required on the driven side of the belt transmission body 18, and the amount of protrusion of the entire belt transmission unit A to the side of the machine body is reduced accordingly.
Not only is the body width narrower, making it possible to have a more compact configuration, but it is also advantageous in terms of cost.
In the figure, 22 is a steering handle, and 23 is a tilling rotor ratchet wheel.

In the configuration as described above, during forward work, the tension pulley 10c is rotated upward as shown in FIG. The transmission belt 9 is tensioned to transmit the power of the engine 1 into the transmission case 5.

If it is necessary to move backward during work, the clutch operation lever 11 is turned off to rotate the tension pulley 10c downward and cut off the forward movement. After that, operate the reverse lever 19, pull the wire 20, rotate the arm 13 in the direction of arrow A in FIG. 4, press the friction wheel 16 at the tip against the friction wheel 4 on the engine output shaft 2 side, The rotation direction is opposite to that of the rotation direction, and the power is transmitted to the transmission input shaft 6 and then to the transmission case 5 via the pulley 15, the transmission belt 17, and the reversing pulley 8. The vehicle is decelerated appropriately to obtain reverse speed.

Effects of the invention As described above, the present invention provides a compact mobile agricultural machine in which the power transmitted from the output shaft of the engine to the transmission input shaft via the transmission belt is turned on and off by operating the tension clutch. A belt transmission body that can rotate integrally in the vertical direction with Because the structure is configured to obtain reverse power, it is possible to obtain reverse power by simply rotating the belt transmission body in the vertical direction, and the reverse power can also be interrupted and disconnected. This eliminates the need for belt guides, etc. for prevention purposes, making the overall structure of the belt transmission device simpler and more compact.In addition, the reverse power can be switched on and off by rotating the belt transmission body, which is always under tension. Compared to conventional belts that use tension pulleys to tighten and loosen the belt to intermittent power, the life of the belt can be significantly extended, and the belt transmission body for reverse power rotates entirely around the transmission input shaft. Because of the movement, the distance between the pulley cores in the belt transmission body is always maintained at a constant distance without changing even when the power is interrupted, so power can be transmitted accurately and the belt cover can be made as small as possible. There is an effect that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main part, Fig. 2 is a plan view of the same as above, Fig. 3 is a cross-sectional plan view of the main part, Fig. 4 is a diagram for explaining the operation, and Fig. 5 is a cross-sectional plane showing another embodiment. FIG. 6 is an overall perspective view of a tailor equipped with the present invention. In the figure, 1 is the engine, 2 is the engine output shaft, and 6
is the transmission input shaft, 9 and 17 are the transmission belts, 1
0 is the tension clutch, 18 is the belt transmission body.

Claims (1)

[Scope of utility model registration request] In a small mobile agricultural machine in which the power transmitted from the output shaft of the engine to the transmission input shaft via the transmission belt is turned on and off by operating a tension clutch, the transmission input shaft is integrally moved in the vertical direction using the transmission input shaft as a rotational fulcrum. A rotatable belt transmission body is provided in parallel with the transmission belt, and the rotating portion on the leading end side of the belt transmission body is pressed against the output shaft side of the engine to obtain reverse power. Back device for small mobile agricultural machinery.