JP2596922Y2 - Cutting blade drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade driving device provided in a combine or a reaper.

[0002]

2. Description of the Related Art Generally, a seed cutting blade driving device includes a fixed cutting blade and a moving cutting blade opposed to the cutting blade, and a crank arm is provided near the fixed and moving cutting blade via a pivot. And the other end of the crank arm is connected to the movable cutting blade, and the other end of the crank arm is connected to a drive shaft interlocking with a drive source. The movable cutting blade is reciprocated with respect to the fixed cutting blade via the crank arm in conjunction with the rotational drive of the drive shaft in connection with the interlocking connection, thereby cutting a grain stalk or the like.

However, in the above-described cutting blade driving device, power fluctuation (acceleration fluctuation) occurs when the moving cutting blade reciprocates with respect to the fixed cutting blade, that is, the moving cutting blade is moved in one direction, and the grain culm is moved. When mowing, etc., the acceleration of the moving cutting blade is slowed by the cutting resistance due to the cereal stem, etc. On the other hand, when the moving cutting blade returns in the other direction after cutting the cereal stem, etc., there is no cutting resistance. The acceleration becomes faster, and therefore, a large power fluctuation occurs on the drive shaft side due to such an acceleration difference of the moving cutting blade, and the power fluctuation of the drive shaft causes a large vibration and noise. It is.

Therefore, a so-called double action type in which the respective cutting blades are reciprocally driven together has been proposed, but in this double action type,
At the time of cutting the cereal stem and the like by each cutting blade, both are driven to reduce the cutting resistance by the cereal stem and the like,
While the power fluctuation of the drive shaft can be reduced and the generation of vibration and noise can be reduced, the drive mechanism for driving each of the cutting blades in the above-mentioned double action type is very complicated. Therefore, there was a problem that the production cost became high.

Recently, for the purpose of solving the above-mentioned various problems, a flywheel is mounted on the drive shaft, and the drive shaft when the movable cutting blade reciprocates with the flywheel. There has been proposed a cutting blade drive device capable of reducing the fluctuation of power and reducing the generation of vibration and noise and reducing the production cost as compared with the above-mentioned double action type.

[0006]

However, as described above, when the power fluctuation of the drive shaft is reduced by using the flywheel, the flywheel is used as the flywheel when the movable cutting blade reciprocates. It is necessary to use a large weight capable of coping with the maximum load applied to the side, that is, usually, the movable cutting blade can be operated at high and low speed by rotating the drive shaft at high and low speed. It is necessary to attach a heavy flywheel to the drive shaft corresponding to the power fluctuation acting on the drive shaft at the time of high-speed operation of the movable cutting blade. Therefore, the flywheel acts on the drive shaft to which the flywheel is attached. It is necessary to increase the shaft strength by increasing the load and increasing the shaft diameter, and when increasing the shaft strength of the drive shaft, the strength of a bearing member or the like supporting the drive shaft is required. There has been a problem such as there is a need to strengthen.

An object of the present invention is to use a flywheel having a constant weight, while varying the rotational moment of the flywheel according to the operating speed of the cutting blade, that is, the rotational speed of the drive shaft on which the flywheel is mounted. The power fluctuation of the drive shaft when the cutting blade reciprocates with the flywheel can be reduced, and the generation of vibration and noise can be reduced without particularly increasing the strength of the drive shaft and bearing members. It is an object of the present invention to provide a cutting blade drive device which can be used.

[0008]

In order to achieve the above object, the present invention provides a crankshaft for moving a reciprocally supported cutting blade to a drive shaft connected to a drive source, and power fluctuation of the drive shaft. In a cutting blade drive device provided with a flywheel for reducing the load, the flywheel is provided with a cover having a receiving space extending in a centrifugal direction and a weight movably received in the receiving space. And

[0009]

According to the above-described cutting blade drive device, the rotation speed of the drive shaft is set to a high speed, and when the cutting blade is operating at a high speed, the flywheel attached to the drive shaft is also rotated at a high speed. When the weight provided on the flywheel is moved radially outward by centrifugal force, the moment acting on the weight increases, and the flywheel moves the cutting shaft during high-speed operation of the cutting blade. It will be balanced with power fluctuations, while the rotation speed of the drive shaft is low, and when the cutting blade is operating at low speed, the weight is moved radially inward, The moment of the weight becomes small. At this time, since the load fluctuation acting on the cutting blade is also small, it is balanced with the power fluctuation of the drive shaft. Accordingly, despite the flywheel having a constant weight, the rotational moment is varied in accordance with the operating speed of the cutting blade, that is, the rotational speed of the drive shaft, and while increasing or decreasing the power of the flywheel, It is possible to reduce the power fluctuation of the drive shaft when the cutting blade reciprocates with the wheel, so that in the conventional case using a flywheel with a heavy weight corresponding to the load applied to the drive shaft during high-speed operation of the cutting blade. Thus, the generation of vibration and noise can be reduced by the flywheel having a constant weight without particularly increasing the shaft strength of the drive shaft. In addition, since the weight of the flywheel moves in the accommodation space, the straw, such as grain stalks cut by the cutting blade, is wrapped around the weight, and the mud in the field is prevented from adhering to the weight. It is possible to prevent the weight from malfunctioning due to straw and / or mud. Moreover, when the straw is wound around the weight, the wound amount of the straw is gradually increased, and the straw is wound around the drive shaft, which hinders the cutting and transporting of the grain stalk by the cutting blade, In the present invention, since it is possible to prevent the wrapping of the straw around the weight, it is possible to satisfactorily carry out the cutting blades and the transfer work of the grain stalk without obstructing the cutting blade and the transfer work of the stalk. You can.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting blade drive shown in FIG.
And a movable cutting blade 2 opposed to the fixed cutting blade 1. A crank arm 3 having first and second arm portions 31, 32 is disposed near the fixed and movable cutting blades 1, 2. The intermediate portion of each of the arm portions 31 and 32 is swingably supported on a mowing portion frame (not shown) via a pivot shaft 33, and the first arm portion 31 of the crank arm 3 is connected to the above-described arm. It is connected to a mounting plate 21 provided on the moving blade 2 and
The drive shaft 4 that links the arm 32 to a drive source (not shown)
The movable cutting blade 2 is reciprocated with respect to the fixed cutting blade 1 via the crank arm 3 with the rotation of the drive shaft 4.

More specifically, as shown in FIG. 2, a gear box 5 having an output gear 51 to which rotational power is transmitted from the drive source and having a boss 52 protruding from one side is provided. The drive shaft 4 is rotatably supported via a plurality of bearings 53 interposed between the boss portions 52, and an input gear 41 provided at a shaft end of the drive shaft 4 and an output gear 51 in the gear box 5 are provided. And the output gear 51
Is transmitted to the drive shaft 4 via the input gear 41, and the support plate 6 is fixed to a shaft end of the drive shaft 4 protruding outward from the boss portion 52. An extension 61 is provided on the support plate 6 and extends radially outward from the periphery of the drive shaft 4. The distal end of the extension 61 is provided with respect to the extension 61. A shaft 62 extending orthogonally outward is attached, and the connecting body 7 is swingably supported on the shaft 62 via a plurality of bearings 63. The arm 32 is connected to the arm 32 by an adjusting body 8 capable of adjusting the expansion and contraction.

Then, by the rotational driving of the driving shaft 4,
By rotating the support plate 6 around the drive shaft 4 and rotating the connecting body 7 and the adjusting body 8 about the shaft 61 accordingly, the entire crank arm 3 is , The movable cutting blade 2 is reciprocated with respect to the fixed cutting blade 1 to perform a cutting operation of a grain culm or the like.

Thus, in the above-described cutting blade drive device,
A flywheel 9 having a constant weight is provided around the outer periphery of the boss portion 52 of the gear box 5, and the flywheel 9 is integrally attached to the drive shaft 4 via the support plate 6, and The support plate 6 in the foil 9
A cover 10 for covering the outer surface of the flywheel 9 is provided on the outer periphery of the boss 52 on the opposite side of the cover 1.
The inside of 0 is a storage space extending in the centrifugal direction, and a weight (hereinafter referred to as a centrifugal weight) 11 that moves in the centrifugal direction in response to the centrifugal force generated by the rotation of the flywheel 9 is provided in this storage space. .

More specifically, the flywheel 9 is formed of a magnet, and the centrifugal weight 11 is attached to the flywheel 9.
The cover 1
0, on the radially outward side of the weight 11,
When the movable cutting blade 2 is driven at high speed, the drive shaft 4 is rotated at high speed, and the flywheel 9 is rotated at high speed.
The weight 11 adsorbed on the spring 1 is moved by the centrifugal force to the spring 1
1 is moved radially outward of the flywheel 9 to the position A in FIG. 1 and the weight 11 is sucked and held at this position to reduce the rotational moment of the flywheel 9. Also, when the driving shaft 4 is rotated at a low speed during the low speed operation of the movable cutting blade 2, the flywheel 9 is rotated at a low speed.
2 is moved radially inward of the flywheel 9 to the position B in FIG.
The rotation moment of the flywheel 9 is reduced by holding the suction wheel 1 by suction.

The flywheel 9 is not necessarily formed of a magnet, but may be formed of a normal iron plate. In this case, for example, as shown in FIG. A guide body 13 extending in the radial direction is provided inside the body, and the centrifugal weight 1 is provided inside the guide body 13.
1 is movably provided, and the weight 11 is positioned radially outward on the radially outer side of the weight 11 in accordance with the rotational speed of the drive shaft 4, that is, the centrifugal force caused by the rotation of the flywheel 9. May be provided.

Next, the operation of the cutting blade driving device having the above configuration will be described. First, when the rotation speed of the drive shaft 4 is high, and the moving blade 2 is reciprocating at a high speed with respect to the fixed blade 1, the flywheel 9 attached to the drive shaft 4 also rotates at a high speed. Therefore, the centrifugal weight 11 provided on the flywheel 9 is moved radially outward by centrifugal force, whereby the moment of the weight 11 increases, and the power of the flywheel 9 is reduced. It increases and balances with the power fluctuation of the drive shaft 4 during the high speed operation of the movable cutting blade 2. When the rotation speed of the drive shaft 4 is low and the cutting blade 2 is reciprocating at a low speed, the flywheel 9 is also rotated at a low speed.
The weight 11 is moved radially inward, whereby the rotational moment of the weight 11 is reduced, the power of the flywheel 9 is reduced, and the weight of the movable cutting blade 2 during low-speed operation is reduced. Balance with the power fluctuation of the drive shaft 4.

That is, in the above configuration, the rotation speed of the drive shaft 4 corresponding to the operation speed of the movable cutting blade 2, that is,
By moving the weight 11 radially inward and outward with a centrifugal force corresponding to the rotation speed of the flywheel 9 rotated following the drive shaft 4, a constant weight flywheel 9 can be used. Nevertheless, the rotational moment can be varied according to the rotational speed of the drive shaft 4, and the power of the flywheel 9 can be increased or decreased. Accordingly, it is not necessary to use a flywheel 9 having a weight corresponding to the load applied to the drive shaft 4 when the cutting blade 2 is operated at a high speed, and the flywheel 9 having a weight corresponding to a power change at a low speed operation.
Therefore, unlike the conventional case, the weight of the flywheel 9 corresponding to the power change during low-speed operation can be reduced without particularly increasing the shaft strength of the drive shaft 4.
Thus, it is possible to reduce the generation of vibration and noise during high-speed operation as well as during low-speed operation.

[0018]

[Effects of the Invention] As described above, according to the present invention,
By moving the weight radially outward with centrifugal force corresponding to the operating speed of the cutting blade, that is, the rotational speed of the flywheel that is rotated following the drive shaft, the flywheel responds to power fluctuations during low-speed operation. Regardless of using a light weight that is appropriate, the power of the flywheel is changed according to the rotation speed of the drive shaft by the action of the weight, so that the flywheel is used at the time of high-speed operation as well as at low-speed operation. The power fluctuation of the drive shaft when the cutting blade reciprocates can be reduced, and the generation of vibration and noise can be reduced without particularly enhancing the shaft strength of the drive shaft. . In addition, since the weight of the flywheel moves in the accommodation space, it is possible to prevent the straw such as grain stalks that the cutting blade cuts from wrapping around the weight and prevent the mud from the field from adhering to the weight. It is possible to prevent the weight from malfunctioning due to straw and / or mud. In addition, when the straw is wound around the weight, the wound amount of the straw is gradually increased, and the straw is wound around the drive shaft, thereby hindering the cutting and transporting of the grain stalk by the cutting blade. In this case, the winding of the straw around the weight can be prevented, so that the cutting and transporting of the cereal stalk does not become a hindrance, and the culling and transporting of the cereal stalk can be performed well.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cutting blade driving device according to the present invention.

FIG. 2 is a cross-sectional view of the main part.

FIG. 3 is a side sectional view showing another example of attachment of a centrifugal weight.

[Explanation of symbols]

 2 Cutting blade (moving cutting blade) 3 Crank arm 4 Drive shaft 9 Flywheel 11 Centrifugal weight

Claims (1)

(57) [Scope of request for utility model registration] 1. A cutting blade drive device comprising a driving shaft connected to a driving source, a crank arm for moving a reciprocatingly supported cutting blade, and a flywheel for reducing power fluctuation of the driving shaft. A cutting blade driving device, wherein the flywheel includes a cover having an accommodation space extending in a centrifugal direction and a weight movably accommodated in the accommodation space.