JPS5821135B2 - Makikakedendougunokinchiyousouchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tensioning device for a power transmission tool.

In general, transmission devices, such as belts and chains, are constructed by winding the transmission gear around rings at appropriate intervals, and are tensioned with tension devices to absorb the elongation of the belts and chains during use. ing.

Conventionally, this tensioning device tensioned the tensioning device in one direction, and was configured so that it could be displaced not only to the side that absorbs stretch, but also to the side that loosens, so when a heavy load is applied, the belt The tensioning tool was displaced to the slack side of the chain, and the belt chain sometimes came off the loop.

The object of the present invention is to provide an extremely simple configuration that eliminates such problems.

That is, the tensioning device for a winding power transmission device according to the present invention is provided with a moving member that elastically biases the winding power transmission tool toward the side where the winding power transmission tool is tensioned;
A screw body is screwed into this movable member, and this screw body is connected to a coil spring twisted in one direction, and the screw body is brought into contact with a fixed member, and the movable member and the transmission gear are moved in the tensioning direction. The present invention is characterized in that the generated gap between the screw body and the fixed member is absorbed by relative spiral movement in the axial direction of the movable member due to relative rotation based on the restoring twisting force of the coil spring.

In other words, the threaded body which is elastically pressed against the fixed member by a coil spring, and the winding which is biased to absorb loosening during use, move together with the movable member for tensioning and biasing the transmission, and the threaded body and the fixed member The gap generated between the coil spring and the fixing member is absorbed by the movement of the screw body due to the restoring twisting rotation of the coil spring, and the screw body and the fixing member are brought into contact with each other while absorbing the elongation of the transmission tool.
This can prevent the moving member from moving toward the loose side of the transmission.

Therefore, the structure for absorbing the elongation of the continuously wound power transmission using the threaded body has been made extremely simple by effectively utilizing the coil spring.

Embodiments of the present invention will be described in detail below based on illustrative drawings.

FIG. 1 is a plan view of a stem culm lifting device installed in a mobile agricultural machine, such as a combine harvester. Inside a lifting case 1, lifting claws 2 are installed at appropriate intervals. A chain 3 (the winding is a transmission device) that is pivotally connected to the drive wheel 4,
It is wound around the idler wheel 5 and the tension wheel 6.

A bracket 8 is attached to the support shaft 7 of the tensioning ring 6, and a tensioning movable member 10 for urging the tensioning ring 6 in the chain tensioning direction with a spring 9 is attached to the fixed machine frame 1.
It is attached so that it can move relative to 1.

A nut (screw body) 12 is screwed into the moving member 10, and a coil spring 1 is inserted into the moving member 10 and is pre-twisted around the axis in one direction and compressed by a certain amount.
The nut 12 is connected to one end of the coil spring 13, and the other end of the coil spring 13 is locked in a hole of the fixing member 11,
The nut 12 is in elastic contact with the fixing member 11.

According to such a configuration, when the chain 3 stretches during use, the tension ring 6 is moved to the chain tension side by the moving member 10 biased by the spring 9, and the stretch of the chain 3 is automatically absorbed. It is.

In this case, the movable member 1 moves in the direction of the arrow with respect to the fixed member 11.
The gap created between the nut 12 and the fixing member 11 due to the movement of the nut 12 is reduced by the elastic restoring twisting rotation of the coil spring 13, which causes the nut 12 to spiral forward and close the fixing member 1 again.
1 and is absorbed, thereby preventing the moving member 10 from moving toward the slack side of the chain 3.

FIG. 4 shows another embodiment, in which the moving member 1
The coil spring 9 that is inserted through the coil spring 9 is used as a spring for biasing the moving member, and by configuring it in this way, the tension spring 13 can be effectively utilized, and the configuration can be simplified.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the tensioning device for a power transmission device according to the present invention; FIG. 1 is a plan view of the culm pulling device, FIG. 2 is a cross-sectional view of the main part, and FIG. Fig. 4 is a side view, the opening is an exploded perspective view, and Fig. 4 is a sectional view showing another embodiment. 3... Chain, 10... Moving member,
11...Fixing member, 12...Screw body,
13... Coil spring.

Claims (1)

[Claims] 1. For winding, a moving member 10 is provided that elastically biases the transmission tool 3 toward the tension side, and a threaded body 12 is screwed onto this moving member 10, and a coil spring 13 with this threaded body 12 twisted in one direction is provided. The screw body 12 is connected to the fixing member 1.
1, and the gap between the threaded body 12 and the fixed member 11 caused by the movement of the movable member 10 and the transmission gear tensioning direction is adjusted to the axis of the movable member due to relative rotation based on the restoring twisting force of the coil spring 13. A winding is a tensioning device for a power transmission device, characterized in that it is constructed to be absorbed by relative spiral movement in a direction.