JPS5822434Y2 - Power transmission belt tensioning device - Google Patents

Description

[Detailed explanation of the invention] This invention consists of a driving wheel and a driven wheel that are mounted on different mounting shafts with different axles, and a driving wheel and a driven wheel that are loosely fitted on different mounting shafts with different axles. A power transmission belt that connects each driving wheel and the intermediate wheel by each hook on the intermediate wheel, and allows both driving wheels to be interlocked via the intermediate wheel.The power transmission belt has a structure in which the belt can be tensioned simultaneously by one operation part. It concerns a tensioning device.

An embodiment in which this invention is applied to a power transmission mechanism to a straw conveying belt of a harvester and a straw cutting device will be described below.

Similar to known harvesters, the harvester of this embodiment is equipped with a threshing device 2 and a straw cutting device 3 on the top of a caterpillar device 1, and feeds the husks from the culm supply table 4 to the foot chain 5. The husks supplied into the threshing device 2 by the foot chain 5 and threshed are introduced into the straw cutting device 3 by the straw conveying belt 6, shredded, and then discharged to the outside of the machine.

The straw removal conveyor belt 6 and the straw removal cutting device 3 are
From the prime mover 7 to the caterpillar device 1. A driving shaft 80 is taken out near the opposite side of the straw cutting device 3 on the side of the threshing device 2 so as to be interlocked with the driving portion of the threshing device 2 etc., and a driving pulley 81 is fixed to the driving shaft 80. , a driven shaft 82 which is taken out from the vicinity of the main drive shaft 80 on the side of the straw removal cutting device 3 and connected to the straw removal conveying belt 6 and the drive section of the straw removal cutting device 3, and a driven shaft 82 fixed to this driven shaft 82. A pulley 83, a fixed shaft 84 provided on the lower driven shaft 82 side between the main driving shaft 80 and the driven shaft 82, a two-striped intermediate pulley 85 loosely fitted to the fixed shaft 84, and a main drive It is driven via a power transmission mechanism 8 consisting of a pulley 81, an intermediate pulley 85, and a driven pulley 83.

Reference numeral 9 denotes a power transmission belt tensioning device of this invention, which in this embodiment includes a mounting shaft 90 provided near the fixed shaft 84;
A tension pulley (tension ring) 91 is attached to the fixed shaft 84, respectively.
．． Tension arm (tension wheel support arm) 93 provided with 92
and a tension plate (tension wheel support arm) 94 is rotatably mounted, and the tension pulley 91 is attached to a V-belt 96.
The tension pulley 92 is brought into contact with the slack side of the V-belt 87 so as to face each other, and the L-shaped receiving piece 95 is rotatably attached to the side surface of the tension plate 94. Insert the operating screw 97 to which the operating nut 96 is screwed so that the operating nut 96 is in contact with the rear surface of the receiving piece 95, and connect the operating screw 97 and the tension arm 93 to the operating screw 97. 97
The hooks at both ends of the tension arm 93 are connected by a coil spring 98 with hooks inserted into the mounting hole provided at the tip of the tension arm 93 and the mounting hole provided at the head of the operating piece 93a of the tension arm 93.

Therefore, when the operating nut 96 is turned to the right or left, the operating screw 97 moves back and forth, causing the tension arm 93 and the tension plate 94 to vibrate around the mounting shaft 90 and the fixed shaft 84, so that the tension pulley 91 is The belt 86 and the tension pulley 92 can tension and relax the V-belt 87 at the same time.

As described above, the power transmission belt tensioning device according to the present invention is capable of handling each power transmission belt (in the embodiment, ■bell) 86,
87) are equipped with rotatable tension wheel support arms (a tension arm 98 and a tension plate 94 in the embodiment) so as to face each other. The tension ring (in the embodiment, the tension boob IJ 91.92) simultaneously approaches and separates from the respective power transmission bells 86 and 87. The operating body (in the embodiment, the operating screw 97 rotates the operating nut 96 Since the configuration is such that the drive wheels are connected to each other by the drive pulley 81, which is mounted on different mounting shafts with different shaft centers, by simply operating one operating body, the drive wheels (in the example, the drive pulley 8 . A driven boob IJ 83) and a plurality of power transmission bells each hung on an intermediate wheel (in the embodiment, an intermediate pulley 85) that is loosely fitted to a different mounting shaft whose axis is different from that of these driving wheels 81.83). Since the belts 86 and 87 can be tensioned and relaxed at the same time, compared to the conventional structure in which each power transmission belt is equipped with an individual tensioning device, it has the advantage that tensioning and relaxing operations can be performed extremely easily.

Since this invention can be made very compact in terms of structure, the space for installing the power transmission mechanism for the straw removal conveyor belt of the harvester and the straw removal cutting device shown in the example is small, and the respective power transmission belts cannot be installed easily. Even if there is not enough space to individually equip a device, it can be easily installed and at the same time, tension and relaxation can be adjusted.

In addition, this invention has a tension arm 93 as in the embodiment.
If a coil spring 98 is provided on the operating body 97 that connects the tension plate 94 to the tension plate 94, the tension force can be uniformly distributed to each belt by the biasing force of the coil spring 98 for the movement of the operating body 97. It has the advantage of being able to tension the belts with equal force, and together with its simple structure, it is extremely useful as a tensioning device for power transmission belts in practice.

Note that this invention is not limited to the structure of the embodiment. For example, in the embodiment, the operating screw was moved by the rotation of the operating nut, but the operating screw may be directly rotated.
Alternatively, the operating screw may be replaced with a wire using a screw body.

Also, in this embodiment, the driving wheel axis and the driven wheel axis are close to each other, and the angle between them and the intermediate wheel axis is an acute angle. However, in the present invention, the rotation axis of the tension arm is separate, and the arm is independent Because it can rotate, and its relative position can be selected appropriately, if the driving wheel and driven wheel are far apart, or in extreme cases, the driving wheel axis, intermediate axis, and driven shaft may be on the same straight line. This has the effect that belt tension can be applied equally and easily over a wide range regardless of the relative positions of the driving wheel, intermediate wheel, and follower wheel.

Of course, various design changes may be made as long as they do not deviate from the technical idea stated in the claims of the utility model registration.

As the angle formed by the main drive shaft, fixed shaft, and driven shaft gradually increases from an angle close to 0° to 180°, the setting position of 93a is gradually rotated counterclockwise. Change the shape and make a straight line 84-
If 95 is set so that 95 rotates clockwise, no matter how the relative positions of all the fixed shafts and driven wheels change, the direction of the force of the tension wheel acting on the belt will be the same as that of the belt. It can be added almost at right angles to.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a harvester to which an embodiment of this invention is applied, Fig. 2 is an enlarged side view of the main parts of the power transmission mechanism to the straw conveying belt and straw cutting device, and Fig. FIG. 2 is a cross-sectional plan view of FIG. 2; 8... Power transmission mechanism, 80... Main drive shaft, 81... Main drive pulley, 82... Driven shaft, 83... Driven pulley , 84... Fixed shaft, 85... Intermediate pulley, 86, 87...
...■ Belt Mira...Tension device, 90...
...Mounting shaft, 91.92...Tension pulley, 93...Tension arm, 93a...
...Operation piece, 94...Tension plate,
95...Socket, 96...Operation nut,
97...Operating screw, 98...Coil spring.

Claims (1)

[Scope of utility model registration request] In a power transmission mechanism that uses a tension pulley to prevent the slack side of a belt that rotates from a main driving wheel to an intermediate wheel and then to a driven wheel from becoming slack, the tension arm has a tension pulley at one end, a rotation shaft hole at the other end, and a belt that rotates the driven wheel. an operating piece fixed to the arm in a V-shape; a tension plate having a tension pulley, a rotating shaft hole, and a receiving piece near the inside of the apex of the triangular plate; and both fixed shafts fitted into the both shaft holes;
a tension spring connecting the operating piece and the receiving piece and adjustable by a screw; the main driving wheel and the intermediate wheel;
The two tension pulleys are configured to move toward and away from the respective power transmission belts at a substantially right angle so as to face each other on slack sides of the power transmission belts of the intermediate wheel and the driven wheel. Power transmission belt tensioning device.