JPH0451525Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a forward/reverse rotary device with a transmission mechanism.

[Prior Art] Conventionally, a forward/reverse rotary device that is connected to and towed by a tractor does not have a transmission in a transmission case, and cannot change the speed ratio in the transmission path. As an example of prior art, there is a device as described in Japanese Utility Model Application Publication No. 51-67204. In the device described in this publication, one input shaft is mounted on a transmission case, and a transmission is provided on either side of a driven shaft driven by the input shaft.

[Problems to be solved by the invention] The device described in the above publication is configured to give the tilling shaft a forward rotation at a low speed and a reverse rotation at a high speed. and reverse rotation at low speed and cannot be given.

[Means for solving the problem] This invention changes the rotation direction and rotation speed of the tilling shaft depending on the purpose and content of the work, and makes use of one rotary device four times more effectively than conventional devices. The aim is to reduce the total cost.

For this reason, this invention has taken the following technical measures. That is, input shafts 1 and 1a, which are rotationally driven by receiving power from the tractor side, are provided at the front and rear of the transmission case 7, and two sets of transmissions are provided on the left and right sides of the input shafts 1 and 1a, and have different rotational directions and reduction ratios. Equipment A, B
is provided in the transmission case 7, and a transmission member 23 for transmitting power to the tilling shaft 3 is provided on the transmission shaft 2 of the transmission devices A and B, and this transmission member 23 and the tilling shaft 3
A power transmitting device 4a is interposed between the power transmission member 24 attached to the rotary shaft 3 and the tilling shaft 3 to provide different rotational directions and different rotational speeds.

[Example] Hereinafter, an example of this invention will be described based on the drawings. First, to explain the structure, reference numeral 6 is a forward/reverse rotary device, which is connected to the rear of a tractor (not shown) via an appropriate link mechanism so as to be able to rise and fall.

Input shafts 1 and 1a are provided protruding from the front and rear of the transmission case 7 along the front-rear direction. This input shaft 1,
1a may be composed of one piece as shown in Fig. 1, but
It may also be configured with two separate shafts as shown in FIG. In the case of Fig. 1, the pinion gear 9 integrated with the input shaft 1 meshes with one large-diameter bevel gear 8, and in the case of Fig. 3, the pinion gear 9, 9a of each input shaft 1, 1a and one large-diameter bevel gear 8 mesh with each other. The bevel gears 8 are configured to mesh with each other with a phase shift of 180 degrees.

Further, a small diameter bevel gear 10 is meshed with the bevel gear 9. The large diameter bevel gear 8 is connected to the input shaft 1
The gear 12 is fixed to the inner end of a shaft 11 which is mounted on the transmission case 7 on one left and right side of the transmission case 7.
is installed.

A shaft 18 is mounted on the opposite side of the input shaft 1, and a gear 19 is fixed to the shaft 18 together with the small diameter bevel gear 10.

2 is the shaft 11, 18 in the transmission case 7.
The transmission shaft 2 is a transmission shaft installed parallel to the transmission shaft 2, and a shifter gear 13 is provided on the transmission shaft 2, which rotates integrally with the shaft and is slidable in the axial direction.

Gears 16 and 17 are loosely fitted onto the speed change shaft 2, and the gear 16 is always meshed with the gear 12, and the gear 17 is always meshed with the gear 19. and,
Each gear 16, 17 is provided with an engaging claw 14, 15, and these engaging claws 14, 15 are configured to selectively engage with the locking claws 20, 21 of the shifter gear 13.

In addition, in Fig. 1, A is the high-speed side transmission;
B indicates a transmission on the low speed side. The high-speed transmission A is composed of a small-diameter bevel gear 10, a gear 19, and a gear 17, and the low-speed transmission B is composed of a large-diameter bevel gear 8, a gear 12, and a gear 16.

Furthermore, a sprocket 23 is attached to one end of the speed change shaft 2.
A power transmission device 4 such as a chain 4a is interposed and connected between this sprocket 23 and a sprocket 24 attached to the tilling shaft 3. In this example, a center drive type rotary tiller was used as an example.
It may also be applied to side drive type rotaries.

Reference numeral 5 in the figure is a tiller claw. The tilling claw 5 shown in FIG. 2 is a forward and reverse type claw 28, and cutting blades 26 and 27 are provided on the front and rear edges of the tilling claw.

Next, the action will be explained. FIG. 2 shows a so-called up-cut tilling state in which the tilling claws 5 of the forward/reverse rotary device 6 rotate in the direction of the arrow (R). When a tractor (not shown) is driven in the direction of the arrow A and the tilling shaft 3 is rotated in the direction of the arrow B, the soil is turned over by the tilling claws 5, and a so-called turning is performed.

This work consumes a lot of horsepower, so it is usually done at low speed. When the reversely tilled soil is finely crushed, the shifter 22 is switched to operate the high-speed transmission A, giving the tilling shaft 3 high-speed forward rotation, that is, downcut rotation. In this case, the horsepower consumption is not as large as in the case of up-cutting, and the tilling shaft 3 is operated at relatively high speeds.
It is possible to rotate.

Depending on the purpose of the work and soil conditions, it may be more efficient to reversely till the soil at high speed. In such cases, change the orientation of the rotary device relative to the tractor and rotate the rotary device to the input shaft 1a on the opposite side. Rotational power from the tractor side is transmitted to rotate the tilling shaft 3. In this case, the tilling shaft 3 rotates at high speed in reverse rotation, but when the transmission is switched, the tilling shaft 3 rotates at low speed in normal rotation.

[Effects of the invention] Since this invention is configured as described above, it has the following technical effects.

That is, an input shaft that is rotationally driven by receiving power from the tractor side is provided at the front and rear of the transmission case, and two sets of transmission devices, which are located on the left and right sides of this input shaft and have different rotational directions and reduction ratios, are installed in the transmission case. Because of this, the tilling shaft can be given low-speed forward rotation and high-speed reverse rotation, and by simply changing the direction of the rotary connection to the tractor, it can be further rotated forward and at high speed. It can be used in a variety of ways depending on the purpose and content of the work, and the total cost of the entire device can be lowered. be able to.

In addition, since the two sets of transmissions are installed on the left and right sides with the input shaft in between, the transmission case does not protrude too much to one side in the left-right direction, making the entire transmission case compact and improving its handling. do.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a diagram showing a power transmission path, FIG. 2 is an overall side view, and FIG. 3 is a diagram showing a power transmission path of another embodiment. Explanation of symbols, 1, 1a... Input shaft, 2... Speed change shaft, 3... Tilling shaft, 4... Power transmission device, 5... Tilling claw, 6... Forward/reverse rotary device, 7... Transmission case .

Claims (1)

[Scope of utility model registration request] An input shaft that is rotatably driven by receiving power from the tractor side is provided at the front and rear of the transmission case, and two sets of transmissions having different rotational directions and reduction ratios on the left and right sides of the input shaft are provided in the transmission case, A transmission member is provided on the transmission shaft of the transmission device to transmit power to the tilling shaft, and a power transmitting device is interposed between this transmission member and the transmission member attached to the tilling shaft, so that different rotations can be applied to the tilling shaft. A forward/reverse rotary device with a speed change mechanism that provides different directions and rotational speeds.