JPS584526B2 - Special drum kit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement regarding a drum-equipped sprocket for agricultural machinery, and aims to reduce the weight of the sprocket.

Incidentally, in agricultural machinery such as combines, sprockets with drums on the sides are often used.

Such a drum-equipped sprocket is convenient for use in places where, for example, the user wants to change the running direction of a grain culm lifting chain while maintaining a freely undulating lifting pawl in a particular posture. It is also extremely useful when you want to have the sprocket and pulley adjacent to each other and rotate them at the same speed.

However, since such sprockets with drums are generally manufactured entirely by forging or casting, they generally have the disadvantage of being heavy.
This was a hindrance to reducing the weight of agricultural machinery.

The drum-equipped sprocket according to the present invention includes:
In order to address the above-mentioned conventional problems and reduce the weight of the sprocket, a metal plate drum was attached to the side of the sprocket, and the shape of the attachment part was carefully considered to increase the strength of the connection between the two. This is to ensure sufficient security.

Hereinafter, an embodiment shown in the drawings will be described in detail.

In the figure, 1 is a sprocket having teeth 2 on its periphery, and 3 is a drum attached to one side of the sprocket.

However, the above-mentioned sprocket 1 is almost the same as the conventional sprocket, and is formed by a method such as casting or cutting so as to be thick enough to obtain the necessary tooth thickness. It is formed of a metal plate, for example, a steel plate, and is formed by a method such as press molding as an internal hollow body that is open on one side and consists of a cylindrical portion 3a and a side surface portion 3b.

The drum 3 having such a shape is overlapped with the side surface of the sprocket 1 with its open side, and the end edge of the cylindrical portion 3a is engaged with the side surface of the sprocket using appropriate engagement means provided on the side surface. This keeps it on the same centerline as the sprocket.

That is, in the embodiment shown in FIG. 3, it goes to the outside of the engagement protrusion 4a protruding from the side surface of the sprocket 1, in the embodiment shown in FIG. Outward engagement step portion 4c
The alignment and radial connection of the drum 3 to the sprocket 1 is achieved by engaging the edges of the cylindrical portion 3a to the outside of the sprocket 1, and to the inside of the inwardly engaging stepped portion 4d in the embodiment of FIG. is being done.

Reference numeral 5 denotes a boss made of a suitable pipe material, which passes through the center of the sprocket 1 and faces the center hole 3C of the second drum 3 from the inside.

However, the boss 5 is welded 6a to the side surface 3b of the drum 3 before the drum 3 is engaged with the sprocket 1, and is also welded 6b to the outer surface of the sprocket 1 after the engagement. The drum 3 is connected to the sprocket 1 through the boss 5 in the axial direction.

The drum-equipped sprocket configured in this way is used, for example, in the grain culm lifting mechanism B of the combine A in the following manner.

That is, numeral 7 in the figure is a chain case in which a lifting chain 8 is housed, and the chain is provided with a large number of lifting claws 9 that can be raised and lowered freely.

The above-mentioned sprocket with a drum is housed in one end of the above-mentioned chain case 7, and is rotatably supported by a suitable shaft 10 passing through the boss 5.

A sprocket with a drum supported in this way is
It is used to change the running direction of the lifting chain 80 attached to the sprocket 1 as shown by arrow A in the figure,
It is also used to maintain the lifting pawl 9, which abuts the cylindrical portion 3a of the drum 3 at its base when protruding from the chain case I, in its protruding position.

Reference numeral 11 in the figure is a pawl guide provided inside the chain case, and is adapted to move the lifting pawl 9 that has been protruded as described above while keeping it in that position.

As described above, the drum-equipped sprocket according to the present invention can be used in the same way as the conventional sprocket, but since the drum part is made of a hollow metal plate, the conventional sprocket as a whole is cast or It is much lighter than those made by forging, and is therefore very effective in reducing the weight of agricultural machinery that uses it.

Further, the sprocket with a drum according to the present invention connects the sprocket and the drum in the radial direction by means of the engagement means provided on the sprocket side, and also fixes the boss to both of them, thereby connecting the axes of both of the above. Since the sprocket and drum are designed to be connected in the same direction, assembly during production is easy, and even though the sprocket and drum are formed separately, the connection strength between them is sufficient. It also has the effect of being particularly strong against loads in the radial direction.

[Brief explanation of the drawing]

Fig. 1 is a side view of a combine harvester exemplified as a target for use in an embodiment of the present invention, Fig. 2 is an enlarged cutaway view taken from line I-I in Fig. 1, and Fig. 3 is a cross section of Fig. 2. FIG. 4 is an enlarged cross-sectional view of an embodiment of the present invention seen along a line, and FIGS. 4, 1, 2, and 3 are cross-sectional views showing a portion of other embodiments, respectively. 1 1... Sprocket, 3... Drum, 4a... Engaging protrusion, 4b... Engaging groove, 4C... Outward engaging stepped portion, 4d...
・Inward engaging stepped portion, 5...Boss, 6a, 6b・
·····welding.

Claims (1)

[Claims] 1 Consisting of a sprocket, a hollow metal plate drum open on one side, and a boss fixed to the center of both of them, and overlapping the sprocket and the open side of the drum to the side of the sprocket. A sprocket with a drum for agricultural machinery, characterized in that the drum is coupled in the radial direction by an engaging means provided on a side surface of the sprocket, and also coupled in the axial direction by the boss.