JPS6088257A - Automatic belt-tension adjusting apparatus - Google Patents

Abstract

PURPOSE:To permit automatic adjustment for a belt tension, while preventing the vibtation of a belt, by providing a turning force in one direction for a large- diameter disc by a spring and setting a belt tension by allowing a cam at the center of the large-diameter disc to be engaged with a tensioner side in free swing. CONSTITUTION:An automatic belt-tension adjusting apparatus 4 is installed midway on the belt 3 laid between a driving-side pulley 1 and a triling-side pulley 2. In the apparatus 4, a spring 6 is installed onto a large-diameter disc 5 rotatably supported, and the disc 5 can be revolved in one direction by the retaining strength on the slackened side of the spring 6. A cam 8 is installed onto a revolution shaft 7 at the center of the large-diameter disc 5, and the lift part 8a of the cam 8 is engaged with a small-diameter disc 11 set coaxially with a tensioner 10 which is installed onto the top edge of a swing arm and set in contact with the belt 3. The large-diameter disc 5 is provided with a turning force in one direction by the spring 6, and the tensioner 10 is pressed and put into contact with the belt 3, and thus a prescribed belt tension can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bell 1 tension automatic adjustment device installed in a bell 1 transmission 41, and in particular, it is capable of controlling the tension of the bell 1 to a constant level and adjusting the tension of the bell 1 due to torque fluctuations. 1. Concerning things that prevent swelling.

In the transmission system from bell 1, conventionally, for example, actual open 11f14
As shown in the publications No. 1+-79976 and Japanese Utility Model Application No. 182783/1983, a tension spring equipped with a tension spring in the middle of the bell 1- is pressed into contact, and the initial tension of the belt is reduced. is set. By the way, according to the configuration in which the spring is still applied to the tensioner as in the prior art, when the tension of the bell 1- is reduced due to wear or elongation, the tensioner swings and the tension of the bell 1- is kept constant. It is possible. However, when a large fluctuating load due to a (1-lux change V during high-speed rotation) is applied, the spring expands and contracts, the tensioner swings, and the belt undergoes chordal vibration. This could cause a serious accident such as it coming off the tensioner. Therefore, - is actually set to 1 above to prevent the belt from swinging due to torque fluctuations.
After setting the initial tension 11, tighten the tensioner from 1 to 1 - (-
as a result of which the automatic tension adjustment function is lost.
There is a problem in that the belt tension has decreased and the belt must be retightened.

In view of these circumstances, the present invention provides rl for 1 herk fluctuation.
(An object of the present invention is to provide an automatic belt tension adjustment device that automatically adjusts the bell b'+N force while preventing the belt from swinging.

For this purpose, the present invention is directed to a person who embodies a mainspring↑
Place the cam at the center of the disc gQ G], engage this cam with the swingable tensioner side, and l! '/υ Due to the restoring force on the slack side of the spring, a constant tension is applied to the bell 1- through the spring, and the ratio of the diameters of the cam and the large diameter disk, and the tightening side of the mainspring. The purpose of this is to prevent the belt from swinging due to fluctuations in the restraint force J and l-lux.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, reference numeral 1 i; A belt tension automatic adjustment 3A position 4 is installed in the middle of the belt 3.

Belt tension automatic nN m 'A It 4 is rotation number 1
It has a large-diameter disk 5 supported by +, 1.
T! '/v Good spring 6 with one end on the fixed side 11-
It is attached with the other end fixed to the disc side, and the disc 5 is rotated in one direction by the restoring force of the slack side of the mainspring spring 6. Also, the rotation I11 of the center of the large diameter disc 5 A cam 8 is attached to the cam 8, and a part of the cam 8 (la) is a small-diameter disc mounted on the tip of the arm 9 and coaxial with the tensile tensioner 0 that is in contact with the belt 3. 11.

Here, the distance 111 from the rotating shaft 1 to the engaging portion of the cam sonograph 1 part 8a and the disc 11! For l a, l' iY l of U'nmaipone G wound 8- around the circumference of person 1\disk 5.
) is sufficiently large, and even if the spring restoring force is small due to the ratio of these diameters a, /l+, a large belt tension can be expressed as f;I”4
do. Also, on the contrary, Bell! 4 so as to reduce the effect on the mainspring spring 6 of a large fluctuating load accompanying a 1-lux fluctuation from the - side.

Since 4 to 1 are formed in this way, the spring 6
Due to the restoring force on the slack side, a rotational force of 1 is applied to the large-diameter disk 5, and the tension J-10 is applied to the large-diameter disk 5 through the ring 1 part 8a of the cam 8 and the small-diameter disk 11. Press the belt 3)-1 into contact to set a predetermined belt 1-tension. After using the jq period, bells 1-3 were worn out and stretched, and bell 1
- When the tension is increased (I), the tensioner 10 swings to the 77-m 9 position by the elongation of the belt 3 and presses it in the same manner as interference, thus keeping the tension of the belt 1 constant at all times. be done.

On the other hand, when the large operating load associated with low-speed rotation (11) and 1-lux fluctuation pushes it back from the bell 1-3 to the tensioner 1 (), the diameter of the cam 8 and large-diameter disc 5 increases. Based on the ratio, a force that is a fraction of the above load is VJ.

It acts on the tightening side of the spring 6. Here, since the tension spring 6 has a large restraining force on the tightening side and the force acting thereon is small, the tensioner 1
0. Cam 8. The large disk 5 is elastically supported without almost moving backwards.In this way, the bells 1-3 are prevented from swinging.

d5, J5 in the above example, Zhang Kai 1 related to heat
(For the lower part, it is also possible to use a bimetal instead of the spring.) The large diameter disc may also be made circular.

As described above, according to the present invention, the vibration of the belt 3 due to the 1-lux fluctuation is prevented, and the C1 practical soil tension adjustment of the automatic adjustment of the tension of the d belt 1 becomes small and small. Moreover, if the large-diameter disk 11 is wound with 1J of U mm, it will be advantageous in terms of space.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the apparatus according to the present invention. 1.2...Pulley, 3...Belt, 4...Belt tension automatic adjustment device, 5...Large-diameter disc, 6...Tight spring, 7...Same Rotating shaft, 8...Cam, 8a...
- Part of riff 1, 9...77-m, 10...tensioner, 11...small diameter disc. Q'r n Applicant Fuji Heavy Industries Co., Ltd. Agent - Patent Attorney Kobashi In Ukasa Patent Attorney Susumu Muratsuki

Claims (1)

[Claims] It has a large-diameter disk that is equipped with a mainspring spring and whose restoring force on the slack side applies rotational force to one side, and a cam at the center of the large-diameter disk is engaged with a swingable tensioner to create a belt. An automatic belt tension adjustment device characterized by being configured to set tension.