JPH065684Y2 - Forward-reverse cultivator - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a two-axis input type forward / reverse tilling apparatus.

[Prior art]

2. Description of the Related Art Conventionally, a two-axis input shaft forward / reverse cultivator has two input shafts at the input position of the cultivator, and an output shaft provided in the cultivator in association with the two input shafts has a rotational speed It is known to use different forward or reverse rotations. A gear box is arranged on the front side of the mission case of the cultivating device, and two input shafts are pivotally supported and linked to the mission case.

[Problems to be solved by the device]

Therefore, for example, when trying to obtain a rotation ratio of 200 rpm in the normal rotation of the rotary shaft and 1000 rpm or more in the reverse rotation, the gear itself in the transmission case becomes large and heavy,
In addition, the gear box is also large and heavy.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a small-diameter drive gear on one of the two input shafts and a large-diameter drive gear on the other, and these both drive gears are connected to the output shaft. It is characterized in that the large diameter driven gear and the small diameter driven gear provided in the gear are engaged with each other.

[Action]

With the above-mentioned structure, the forward-reverse cultivator according to the present invention can achieve high-speed reverse rotation and low-speed forward rotation in the two-axis input type with a simple structure, and the input unit can be made compact, and the weight can be reduced, resulting in cost reduction. It is connected.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a gear box provided in the front part of the main body of the rotary tiller, and in the gear box 1, the first input shaft 2 and the second input shaft 2 are parallel to each other and the tip end side is a gear. The second input shaft 3 protrudes forward from the box 1 and is shorter than the first input shaft 2 in the gear box 1. The output shaft 4 is axially supported so as to be orthogonal to the first and second input shafts 2 and 3, and one end of the output shaft 4 passes through the front side of the tip of the second input shaft 3 and comes close to the first input shaft 2. It is extended. A large-diameter bevel gear 5 for driving is fixed to an end portion of the first input shaft 2 in the gear box 1, and a small-diameter gear 6 for driving is fixed to an end portion of the second input shaft 3 in the gear box 1. Has been done. Then, in the portion of the output shaft 4 inside the gear box 1, a driven small-diameter bevel gear 7 that meshes with the large-diameter bevel gear 5 and a driven large-diameter bevel gear 8 that meshes with the small-diameter bevel gear 6 are provided. It is fixed. Behind the input shaft 4, parallel to this, the rotary shaft 9
Is mounted, and a chain transmission system (10) is provided between the side end portion of the output shaft 4 and the side end portion of the rotary shaft 9 so that power is transmitted from the output shaft 4 to the rotary shaft 9. It is like this. The rotary shaft 9 is provided with a plowing / mowing blade (not shown) for performing plowing work during normal rotation and mowing work during reverse rotation. On the other hand, rotational power is selectively transmitted from the PTO shaft of a tractor (not shown) to the first and second input shafts 2 and 3 via a universal joint and a transmission shaft. The large-diameter bevel gears 5 and 8 have 35 teeth, the small-diameter bevel gear 6 has 13 teeth, and the small-diameter gear 7 has 16 teeth.
The number of teeth on both sprocket wheels of a single chain transmission
In the case of four sheets (that is, one-to-one) and the input rotation speed to the first or second input shaft is 540 rpm, the rotary shaft 9
The rotation speed of is as follows. (When inputting to the first input shaft 2) 540 × 35/16 × 14/14 = 1181 rpm (reverse rotation) (When inputting to the second input shaft 3) 540 × 13/35 × 14/14 = 200 rpm (forward rotation) ) Therefore, normal rotation tilling work of 200 rpm, 1181 rpm
It will be possible to selectively perform the reverse mowing work. Also,
The distance between the first input shaft 2 and the second input shaft 3 can be appropriately set by changing the distance l between the small diameter bevel gear 7 and the large diameter bevel gear 8 as shown in FIG. In the forward / reverse tilling apparatus having such a structure, when performing the tilling operation, the forward rotation tilling operation at 200 rpm can be performed only by connecting the power from the tractor to the second input shaft 3. In addition, the power from the tractor should be
Reverse connection mowing work of 1181 rpm can be performed only by connecting to the input shaft 2. In order to change the rotation speed of the rotary shaft 9, the input shaft 2,
3 or the number of teeth of the bevel gears 5-8 may be changed. Also, when inputting to the first input shaft 2, the second
When the input shaft 3 is inputting to the second input shaft 3, both the first input shaft 2 and the first input shaft 2 are idling. Therefore, it is preferable to cover these idling input shafts.

[Effect of device]

As described above, according to the forward and reverse cultivating apparatus of the present invention, the driving gears 5 and 6 are respectively attached to the two input shafts 2 and 3.
Since the output shaft 4 is provided with driven gears 7 and 8 that mesh with the gears 5 and 6, respectively, the output shaft 4 outputs forward and reverse rotations having different rotational speeds to perform up-cut and down-cut. Both the cutting work can be easily done by selecting the input to the two input shafts. In addition, since power transmission and gear shifting are performed with a minimum number of gear meshes, the gear box that houses these gears can be made small, which simplifies and downsizes the mechanism while also reducing weight, achieving cost reduction. To be done.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a partial cross-sectional view of a tilling device, and FIG. 2 is a configuration diagram showing a transmission system. 1 ... Gear box of tiller, 2 ... First input shaft,
3 ... second input shaft, 4 ... output shaft, 5,8 ... large-diameter bevel gear, 6,7 ... small-diameter bevel gear, 9 ... rotary shaft.

Continuation of front page (72) Inventor Yasuhiro Kobiki 684 Nakamata, Okayama City, Okayama Prefecture Kobashi Kogyo Co., Ltd. (56) References: 56-142505 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An input shaft of a cultivator has two input shafts, and an output shaft provided in the cultivator in tandem with the two input shafts rotates forward or reversely at different rotational speeds. In one of the two input shafts, a small-diameter drive gear is provided on one side, and a large-diameter drive gear is provided on the other side, and both drive gears are provided on the output shaft and a large-diameter driven gear and a small-diameter drive gear. A forward-reverse cultivating device characterized in that it is meshed with each of the driven gears.