JPS5822432Y2 - Transmission chain tensioning device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a transmission chain tensioning device.

As is well known, for example, in general tilling equipment, a chain is used for driving the chain, and in this case, it is customary to always include a tensioning device to correct slack in the chain.

Conventional tensioning devices have a tightener that is pivotally supported along the chain, and the tightener is movable and adjustable by a bolt with a lock nut, so that slack can be eliminated at an appropriate time.

In particular, since this bolt was installed in a shape that protruded outside the chain case, it was easy to become unable to adjust it if it was covered with muddy water or mud from plowing, and the internal tension state could not be accurately adjusted by adjusting the bolt from the outside. It was difficult to adjust the tension of the chain because it was difficult to detect the tension.

Furthermore, in the conventional structure, a leaf spring type tightener was pressed from the back with a bolt, which could lead to the tightener being bent at the pressed point, which could easily damage the chain and increase resistance. This is what I was looking for.

The purpose of this invention is to solve these problems, and the features here include: a chain case plate with a lid attached to the chain case; a pivot type tightener attached to the outer periphery of the transmission chain; A fixed guide piece facing the outside with a model fitting space therebetween, and a control lever that is swingable and movable in the longitudinal direction of the lever, and a fitting piece that protrudes from the tip of the swinging side of the control lever. is movably fitted between the tightener and the fixed guide piece, and a fitting biasing spring corresponding to the inside of the transmission chain is provided between the control lever and the chain case plate.

The invention will now be explained with reference to the illustrated embodiments.

What is shown in Figs. 1 to 3 is an example of a side-drive tilling device. The drive sprocket 1 shown in FIG. 1 is rotatable.

2 is a chain case plate fixed to the left end of the tilling device, which connects the driving sprocket 1 and the lower driven sprocket 3.
A chain case 4 is provided with a lid on the outside of the chain case 4, thereby forming a certain transmission space inside.

5 is a wheel shaft for interlocking rotation of the tilling claw shaft;
In this way, a transmission chain 6 that rotates in the direction of the arrow is layered between the upper and lower sprockets 1 and 3.

Here, the tensioning device is composed of a tightener 7, a fixed guide piece 8, a control lever 9, and a fitted biasing spring 10.

The tightener 7 is rotatably supported on a tightener shaft 11 projecting slightly above the outside of the chain 6, and its arcuate side surface is attached to the outer periphery of the transmission chain 6. .

Here, an auxiliary piece 12 having a half-frame shape is fitted onto the lower outer periphery of the tightener 7 from the outside and fixed with rivets.

On the other hand, the fixed guide piece 8 includes a seat part 8a fixed opposite to the chain case plate 2 surface, a receiving piece 8b rising from the seat part 8a in an L-shape, and stoppers 8C98C arranged opposite to each other at the upper and lower ends. The sliding receiving plate 13 fixed to the inside of the receiving piece 8b faces the auxiliary piece 12 to form a downwardly expanding model insertion space S. It is.

Both the auxiliary piece 12 and the sliding receiving plate 13 are made of a material with excellent wear resistance, and the sliding receiving plate 13 is fastened with a detent 14 welded to the top and bottom of the center of the auxiliary piece 12. It is attached by inserting and fixing the mounting bolt 15 into the receiving piece 8b.

In this case, a desired spacer may be inserted and removed between the sliding receiving plate 13 and the receiving piece 8b.

Regarding the control lever 9, a lever support shaft 16 is provided protruding inside the chain case plate 2, and a long hole 17 at the base end of the lever 9 is fitted to the support shaft 16, thereby allowing the lever to swing and move in the longitudinal direction. A fitting piece 18 of a round shaft type protruding from the tip of the lever by welding is fitted into the fitting space S.

In this case, the fitting piece 18 has a fitting groove 18a on the outer periphery of the distal end, and is designed to slide into contact with the auxiliary piece 12 via the groove 18a and avoid the head of the detent 14 etc. that protrudes slightly inward. has been done.

In this way, one end of the biasing spring 10 is locked in the middle of the control lever 9, while the base end of the fixed side of the spring 10 is engaged with the spring stop pin 19 on the chain case plate 2, so that the spring 10 is just transmitting power. The positional relationship is such that it fits within the running path of the chain 6.

Therefore, according to the tensioning device configured as described above, the control lever 9 is forcibly swung in the direction of the arrow by the fit-in biasing spring 10 in response to slack in the transmission chain 6, and thereby the fit-in piece 18 is fitted into the model fit-in space S. As a result, the tightener 7 is pushed inward in the direction of the arrow and automatically absorbs the slack.

At this time, since the control lever 9 is also movable in the longitudinal direction, it is in a state where it is always in sliding contact with both opposing surfaces of the model, compared to a simple swing type, and therefore it is stable after being moved for adjustment. It has the characteristics of good flexibility and suppresses the vibration of the transmission chain 6, making it small and medium-sized.

This invention is as described above, and since the tensioning device is completely internal, there is no risk of loss of adjustment due to being covered with muddy water or mud during tilling, and since it is an automatic adjustment type, it can be adjusted to prevent excessive tension. It is no longer something that is done.

In particular, since all the devices are arranged on the chain case plate side, assembly and disassembly are not only extremely efficient and accurate, but also the mechanism that actually presses the tightener and the mechanism that applies spring force to it are placed in different locations. Furthermore, since the spring force imparting means is conveniently accommodated within the chain as in the embodiment, the device can fit within a compact space and has the advantage of being applicable to conventional standard chain cases. have

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an example of this invention, FIG. 2 is a sectional view taken along the line II--II, and FIG. 3 is a perspective explanatory view of the fitting adjustment section. 2...Chain case plate, 4...
・Chain case, 7... Tightener, 8...
... Fixed guide piece, 9 ... Control lever, 10
...Inset biasing spring, 18...Inset piece,
S...Intrusion space.

Claims (1)

[Scope of utility model registration request] On the chain case plate with the chain case covered,
A pivot type tightener attached to the outer periphery of the transmission chain, a fixed guide piece facing the outside of the tightener with a model fitting space therebetween, and a control lever that is swingable and movable in the longitudinal direction of the lever. At the same time, a fitting piece protruding from the tip of the swinging side of the control lever is movably fitted between the tightener and the fixed guide piece, and is located between the control lever and the chain case plate and corresponds to the inside of the transmission chain. A tensioning device for a power transmission chain, characterized in that it is equipped with a built-in biasing spring.