JPH08266127A - Cutting blade-driving apparatus in combine - Google Patents

Abstract

PURPOSE: To enable the efficient driving in which noise generated at gears can be reduced by driving a reciprocating cutting blade in a combine through plural engaged gears, a crank, a connecting rod and a cutting blade-driving arm in a serial order from a driving shaft placed at the upstream side of the transmission system, and preventing and damping vibrations at three points in the transmission passage. CONSTITUTION: In a combine, the front end of a cutting blade-driving arm 1 pivoted at the central part is cooperatively linked to the knife head 3 of a reciprocating cutting blade 2. A driving shaft 4 placed at the upstream side of the transmission system is linked to a crank 6 through plural engaged gears to transmit the power. Further, the crank 6 and the rear end of the cutting blade-driving arm 1 are cooperatively linked to each other through a linking rod 7. In the transmission system, the driving shaft 4 is cut at the middle point and a cylindrical rubber vibration isolator 12 capable of damping in the twisting direction is placed between the lower end of the driving shaft 4a at the upstream side and the upper end of the driving shaft 4b at the downstream side of the transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine cutting machine capable of driving a reciprocating cutting blade through a plurality of gears, a crank, an interlocking rod, and a cutting blade driving arm which are successively engaged from a drive shaft of a transmission upper position. The present invention relates to a blade drive device.

[0002]

2. Description of the Related Art Conventionally, the tip end of a cutting blade drive arm pivotally supported at the center is interlocked with a knife head of a reciprocating cutting blade, and a drive upper drive shaft is cranked through a plurality of meshing gears. In a cutting blade drive unit of a combine, which is connected to the crank and the rear end of the cutting blade drive arm by interlocking with each other through an interlocking rod, for example, see Japanese Utility Model Laid-Open No. 57-7914. As described above, it is known to interpose a vibration-damping rubber for cushioning on the outer peripheral side of the upright drive shaft portion which is provided at the tip of the cutting blade drive arm and can move the knife head left and right.

[0003]

However, the reaction force from the interlocking rod due to the reciprocating movement of the cutting blade when it is reciprocally driven is applied to the crank, and the crank is engaged on the upper transmission side. Noise is generated due to backlash between multiple gears, and the reaction force of the interlocking rod increases as the cutting speed increases and the number of cuts increases.
Even with a slight backlash, the noise increases, and in the conventional combine harvester, the boarding operation unit is located in the vicinity of the cutting blade, so that the noise causes a serious discomfort to the driver.

[0004]

SUMMARY OF THE INVENTION The present invention solves such a problem and makes it possible to effectively reduce the generation of noise due to backlash between a plurality of gears. The cutting blade driving arm is linked with the knife head of the reciprocating cutting blade, and the drive shaft of the transmission upper layer is transmission-coupled to the crank through a plurality of meshing gears. A cutting blade drive unit of a combine, which is configured by interlockingly connecting the rear end of an arm via an interlocking rod, divides a midway portion of the drive shaft, and the end side of the drive upper drive shaft and the drive lower drive shaft. A cylindrical vibration-proof rubber that can buffer in the twisting direction is interposed between the end and the end.

[0005]

Therefore, the reaction force from the interlocking rod due to the reciprocating motion of the cutting blade reciprocating is applied to the crank and the plurality of gears, but the middle part of the drive shaft, which is the transmission higher rank of the plurality of gears engaged with each other. The shock absorber can absorb the shock even on the drive shaft by the cylindrical anti-vibration rubber that is provided in the shaft and can be effectively reduced by the buffering means. it can.

[0006]

FIG. 1 is a plan view showing a lower side of a right lateral side of a harvesting part of a combine capable of multiple-row mowing. Above each mowing frame 13 arranged at the bottom of the mowing part, mowing is performed. A blade base 14 is provided laterally, a reciprocating type cutting blade 2 supported by a knife bar 15 is provided above a fixed blade 2a provided at the front of the cutting blade base 14, and a horizontal direction is provided above the cutting blade 2. Knife holders 16 provided at intervals are provided, and the upright pieces 3a, 3 parallel to the part of the knife bar 15 on the right side of the entire cutting blade 2 are provided.
A knife head 3 having b above is fixedly provided so that it can be transmitted to the cutting blade 2 from the drive shaft 4 inside the cutting blade drive case 17 provided laterally behind the cutting blade base 14.

On the support frame 18 in the rearward direction of the knife head 3, the central portion of the cutting blade drive arm 1 having a V shape in plan view is pivotally supported so as to be rotatable about the vertical axis portion 19, Both the upright pieces 3a, which are provided at the tip of the cutting blade drive arm 1,
The drive shaft portion 8 standing between the inner pipe 9a and the outer pipe 9b is provided between the inner pipe 9a and the outer pipe 9a.
The cylindrical vibration-proof rubber 9 welded between b and b is fitted.

A vertical crankshaft 21 is mounted in a gear case 20 connected to the right end of the cutting blade drive case 17, and a bevel gear mounted on the end of the drive shaft 4 in the gear case 20. 5a meshes with the bevel gear 5b mounted on the lower part of the crankshaft 21, but the intermediate part on the terminal side of the drive shaft 4 is divided into a drive upper drive shaft 4a and a drive lower drive shaft 4b, and the drive is performed. The base portion of the tubular connector 22 extending to the outer periphery on the starting end side of the shaft 4b is fixed to the end portion of the drive shaft 4a by welding, and the connector 22
A cylindrical vibration-proof rubber 12 capable of buffering in the twisting direction is welded between the inner peripheral surface of and the outer peripheral surface on the starting end side of the drive shaft 4b.

At the upper end of the crank shaft 21 projecting upward of the gear case 20, a center part of the crank 6 having a crank pin 23 projecting upward at an eccentric position is fixedly provided.
The rear end of the cutting blade drive arm 1 and the crank pin 23
The interlocking rod 7 is interposed between the rod and the interlocking rod 7. The interlocking rod 7 is divided into a front rod portion 7a and a rear two-fork portion 7b, and the tip portion of the rod portion 7a is the rear end portion of the cutting blade drive arm 1. To the crank pin 23 via a bearing 25, and the rear end portion of the two-fork portion 7b is fitted to the two-fork portion 7b.
A connecting pin 10 which is orthogonal to the longitudinal direction of the interlocking rod 7 is fitted between the two ends of the front end of b, and an inner pipe 11a is provided between the connecting pin 10 and the rear end of the rod portion 7a. And outer tube 1
A cylindrical vibration-damping rubber 11 welded to 1b is fitted and configured.

Therefore, when the drive shaft 4 is rotationally driven, the crank 6 rotates in the direction of arrow A due to the engagement of the bevel gears 5a and 5b, and the cutting rod drive arm 1 reciprocates while the interlocking rod 7 swings. When the cutting blade driving arm 1 is moved, the cutting head 2 is driven by moving the knife head 3 left and right while reciprocatingly rotating the tip end portion of the cutting blade drive arm 1 around the vertical axis portion 19 as shown by arrow B. .

In this case, a reaction force from the interlocking rod 7 due to the reciprocating movement of the cutting blade 2 is applied to the crank 6 and both bevel gears 5a and 5b, but at the tip of the cutting blade driving arm 1. By the provided cylindrical anti-vibration rubber 9 and the cylindrical anti-vibration rubber 11 provided in the middle of the interlocking rod 7,
The reaction force from the interlocking rod 7 can be buffered,
Moreover, the shock absorber can be absorbed also in the drive shaft 4 by the cylindrical vibration-proof rubber 12 provided in the middle of the drive shaft 4 which is the upper transmission of both bevel gears 5a and 5b and can buffer in the twisting direction. The noise generated by the backlash between the bevel gears 5a and 5b can be effectively reduced by the buffer means at these three places.

[0012]

As described above, according to the present invention, the reciprocating cutting blade 2 is provided.
In the state where the reaction force from the interlocking rod 7 due to the reciprocating motion of the driven shaft is applied to the crank 6 and the plurality of meshing gears 5a, 5b, the drive shaft 4 which is the transmission upper layer of the plurality of meshing gears 5a, 5b The shock absorber can be absorbed by the drive shaft 4 by means of the cylindrical vibration-proof rubber 12 provided in the portion that can absorb the twisting direction, and the gears 5a and 5b can be absorbed.
The noise generated by the backlash during the period can be effectively reduced by the cushioning means, and the driver of the boarding operation section can drive comfortably without hearing the noise generated by the gears even during high-speed work. Therefore, it has a feature that it can be suitably implemented with a simple structure.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of an embodiment of the present invention.

FIG. 2 is a plan view showing an enlarged part of FIG. 1 with a partial cross section.

3 is a sectional view showing a section taken along line III-III in FIG.

FIG. 4 is a plan view showing an enlarged part of FIG. 1 with a partial cross section.

FIG. 5 is a plan sectional view showing a part of an interlocking rod.

6 is a sectional view showing a section taken along line VI-VI of FIG.

7 is a sectional view showing a section taken along line VII-VII of FIG.

[Explanation of symbols]

 1 Cutting Blade Drive Arm 2 Cutting Blade 3 Knife Head 4 Drive Shaft 5a Gear 5b Gear 6 Crank 7 Interlocking Rod 8 Drive Shaft 9 Cylindrical Vibration Isolation Rubber 11 Cylindrical Vibration Isolation Rubber 12 Cylindrical Vibration Isolation Rubber 10 Connecting Pin 4a Drive Axis 4b Drive axis

Claims (1)

[Claims] 1. A gear 5a, 5 for interlockingly connecting a tip end of a cutting blade drive arm 1 having a central portion to a knife head 3 of a reciprocating cutting blade 2 and engaging a plurality of drive shafts 4 of a transmission upper gear with each other.
In the cutting blade drive unit of the combine, which is connected to the crank 6 via b, and the crank 6 and the rear end of the cutting blade drive arm 1 are interlockingly connected via the interlocking rod 7, the drive shaft 4 A cylindrical vibration-proof rubber 12 capable of buffering in the twisting direction is interposed between the end side of the drive shaft 4a of the transmission upper side and the end side of the drive shaft 4b of the transmission lower side while dividing the intermediate part of the drive shaft. A combine cutting blade drive device characterized by being configured as described above.