JP2000304060A - Rotating shaft driving gear assembling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the assembling property of a shaft to a gear by engagingly fitting a polygonal rotating shaft to the polygonal shaft hole of the boss part of the gear, and fitting a round shaft part longer than the bearing thickness of the polygonal rotating shaft to the round shaft hole of the boss part of the gear. SOLUTION: The round shaft part 8 of a polygonal rotating shaft 5 is fitted to a bearing 7 supported on a machine frame to rotatably lay the polygonal rotating shaft 5, and a round shaft hole 10 formed on the boss part of a gear 3 is fitted to the round shaft part 8 of the polygonal rotating shaft 5 protruding from the bearing 7. According to this, the gear 3 can be mounted with precise conformation of the axial center by the fitting of the round shaft and round shaft hole easy to work at low cost, and the polygonal shaft hole 9 of the boss part of the gear 3 can be engagingly fitted to the polygonal rotating shaft 5 to transmit a power. The axial center-to-center space with the other gear meshed with the gear 3 can be precisely kept, and the transmission can be efficiently performed. A large power can be transmitted by the transmission between the gear 3 and the polygonal rotating shaft 5, compared with the transmission by a key or set screw.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive gear assembling apparatus for a polygonal rotary shaft, which is driven to rotate by meshing drive gears.

[0002]

2. Description of the Related Art Conventionally, a driving gear mounted on a polygonal rod-type rotary shaft has a structure in which a boss portion is processed by polygonal broaching and is interlocked with a polygonal rotary shaft. are doing.

[0003]

However, polygonal machining of the shaft and polygonal broaching of the boss are difficult, and the tolerance of the outer diameter of the polygonal rotary shaft and the tolerance of the inner diameter of the gear boss of the polygonal shaft hole are increased. In the fitting structure as described above, the mutual tolerances are synergistic, and the assembling accuracy of the shaft and the gear is deteriorated, which causes the shaft to shift. Therefore, an object of the present invention is to solve the above problem with a simple configuration.

[0004]

According to the present invention, a polygonal rotary shaft 5 is provided.
Is fitted into a polygonal shaft hole 9 formed in the boss portion of the gear 3, and a round shaft portion 8 having a thickness greater than the thickness of a bearing 7 for supporting the shaft 5 is formed on the polygonal rotary shaft 5, and the bearing 7 fitted therewith is formed. The rotary shaft driving gear assembling device is formed by fitting the round shaft portion 8 projecting more and the round shaft hole 10 formed in the boss portion of the gear 3.

[0005]

In order to assemble the gear 3 on the polygonal rotary shaft 5, first, the round shaft portion 8 of the polygonal rotary shaft 5 is fitted to the bearings 7, 7 of the bearing on the machine frame, and the polygonal rotary shaft 5 is rotated. The shaft 5 is mounted. Next, the boss portion of the gear 3 is fitted from one end of the polygon rotary shaft 5, and the round shaft hole 10 formed in the boss portion of the gear 3 is inserted into the round shaft of the polygon rotary shaft 5 protruding from the bearing 7. The gear 3 is fitted to the portion 8 so that the shaft center can be accurately aligned with the easily formed round shaft and round hole fitting structure. At the same time, the polygonal shaft hole 9 of the boss of the gear 3 is engaged with the polygonal rotary shaft 5 to be able to transmit power. In this manner, the polygon rotary shaft 5 and the gear 3 are assembled by fitting the round shaft portion 8 and the round shaft hole 10 which are inexpensive, easy and can be formed with high precision, and mesh with the gear 3. The distance between the shaft and other gears can be maintained with high accuracy, and transmission can be performed efficiently. Since the transmission between the gear 3 and the polygon rotary shaft 5 is performed by fitting the shaft 5 and the polygon shaft hole 9 formed in the boss portion of the gear 3, a large power is required as compared with the transmission by a key or a set screw. Transmission is possible.

[0006]

Next, an embodiment in which the present invention is applied to a hexagonal rotation axis of a culm cutter, which is an example of a polygonal rotation axis, will be described with reference to the drawings. The culm cutter for cutting the threshed culm shortly cuts the culm by close rotation between the rotary blades 1 and 2 arranged along a pair of rotating shafts 5 and 6 facing each other in parallel.
The rotating shaft 6 is formed in a hexagonal rod shape, and a plurality of rotating blades 2 and 2 having a large diameter and a small diameter are arranged at predetermined intervals.
A pulley 12 receiving driving force from the combine vehicle body is attached to a shaft end protruding outside from the cutter machine frame 11, and a small gear 4 is attached between the pulley 12 and the machine frame 11. The rotary shaft 5 is also formed in a hexagonal rod shape, and the rotary blades 1 and 1 and the scraping bodies 13 and 13 are provided corresponding to the rotary blades 2 and 2, respectively.
A large gear 3 that receives a driving force by engaging with the small gear 4 is attached to a shaft end protruding from the machine frame 11 to the outside.
Numerals 7, 7 are bearings for supporting the hexagonal rotary shafts 5, 6, which are mounted on the inner surface of the cutter frame 11 by mounting members 14, 14, and are round shafts formed at the ends of the hexagonal rotary shafts 5, 6. The parts 8, 8 are fitted. The round shaft portions 8 and 8 have a round bar shape longer than the thickness of the bearings 7 and 7 to be mounted. The round shaft portions 8 and 8 protruding from the thickness of the bearings 7 and 7 project from the machine frame 11.

The large gear 3 has a hexagonal shaft hole 9 and a round shaft hole 10 formed in the boss portion, and the round shaft hole 10 is fitted into the round shaft portion 8 protruding from the machine frame 11, It is attached to the hexagonal rotation shaft 5. At this time, the hexagonal shaft hole 9 is
And engages with the hexagonal rod portion of the large gear 3 to interlock with the hexagonal rotation shaft 5. A bolt 15 fixes the large gear 3 to the end of the hexagonal rotary shaft 5 by tightening. The small gear 4
Similarly to the large gear 3, the hexagonal shaft hole 9 and the round shaft hole 10 formed in the boss portion are connected to the hexagonal rotating shaft 6 in an interlocking manner. Reference numeral 16 denotes a collar, which is inserted between the pulley 12 attached to the end of the hexagonal rotary shaft 6 and the small gear 4 to tighten the nut 17 so that the pulley 12 and the small gear 4 are connected to the end of the hexagonal rotary shaft 6. Stick to the part.

When the driving gears 3 and 4 are assembled to the hexagonal rotating shafts 5 and 6 in the above-described configuration, the gears 3 and 4 are, as shown in FIG. , 10 are fitted. The process of forming a circular member is easier and more accurate than the process of forming a hexagonal member, and thus the above assembly is performed with the axes aligned with high precision. Further, hexagonal shaft holes 9, 9 are also formed in the boss portions of the driving gears 3, 4 so that the hexagonal shaft holes 9, 9 are formed in the hexagonal rod portions of the hexagonal rotating shafts 5, 6 at the time of assembling. Engage and fit. This hexagonal shaft hole 9,
9 is to link the rotation of the hexagonal rotation shaft 6 to the gear 4 or
Alternatively, the rotary motion of the gear 3 is provided so as to be interlocked with the hexagonal rotary shaft 5. Even if the assembling accuracy is poor, the angles of the hexagonal rotary shafts 5 and 6 are caught as shown in FIG. Can be performed reliably.

[0009] In the claims, numbers are provided for the purpose of simplifying the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

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

FIG. 2 is an overall plan view according to the embodiment of the present invention.

FIG. 3 is a side sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 3 Gear 5 Polygon rotary shaft 7 Bearing 8 Round shaft part 9 Polygon shaft hole 10 Round shaft hole

Claims (1)

[Claims] 1. A polygonal rotary shaft (5) is engaged with a polygonal shaft hole (9) formed in a boss of a gear (3), and the polygonal rotary shaft (5) is supported by the polygonal rotary shaft (5). A round shaft portion (8) longer than the thickness of the bearing (7) to be formed is formed, and the round shaft portion (8) protruding from the fitted bearing (7) and the round shaft hole formed in the boss portion of the gear (3) are formed. 10) A gear assembling device for driving a rotating shaft, which is fitted with