JPS587164Y2 - Tight pulley mounting device in belt transmission mechanism - Google Patents

Description

[Detailed description of the invention] The present invention is a tight pulley mounting device that can be easily assembled and disassembled in various belt transmission mechanisms, and that can prevent natural disassembly due to loosening of tightening bolts during use. This is related.

Belt transmission mechanisms are often used in power agricultural machinery and other types of power equipment, and many of these belt transmission mechanisms are equipped with a tight boot in order to keep the tension of the transmission belt constant at all times.

By the way, the tight pulley in a conventional belt transmission mechanism is fixed to a tight pulley arm that is attached to the boss of one of the pulleys via a bearing, so when assembling, the pulley is attached to the rotating shaft and then the boss of the pulley is fixed. It is a scam that requires the complicated procedure of fitting and fixing the bearing to the rotating shaft and attaching the tight pulley arm, and the reverse procedure is required to disassemble it. Since the rotating shaft end is simply held down with a tightening bolt via a washer, the tightening bolt tends to loosen due to the rotation of the pulley, which can easily lead to spontaneous disassembly.

In view of the above-mentioned drawbacks, the present invention has been developed to easily and reliably connect the pulley to the rotating shaft and the bearing of the tight pulley arm fitted to the pulley boss at the end of the rotating shaft using one tightening bolt with one washer. In the belt transmission mechanism, the washer can be pressed and fixed to the shaft, and by making the washer non-rotatable with respect to the rotating shaft, it is possible to eliminate loosening of the tightening bolt during use and prevent natural decomposition, etc. It is an object of the present invention to provide a tight pulley mounting device.

The structure of the present invention will be explained with reference to an embodiment shown in the drawings. 1 is a gear case of various power equipment, 2 is a rotating shaft, and a spline is formed on the shaft end of the rotating shaft 2. , and a pulley 3 is fitted therein in a non-rotatable manner.

4 is a tight pulley, 5 is a tight pulley arm,
The tight pulley 4 is rotatably fixed to the distal end of the tight pulley arm 5, and the proximal end of the tight pulley arm 5 is attached to the boss portion 3a of the pulley 3 via a bearing 6.

That is, a tight pulley boss 5a is integrally attached to the base end of the tight pulley arm 5, and a bearing 6 is fitted into the tight pulley boss 5a, and is prevented from coming off by a straight part 7, so that the bearing 6 is fitted into the boss portion 3a of the pulley 3 so that their end surfaces substantially coincide with each other.

A washer 8 is fitted to the end of the rotating shaft 2 so that it cannot rotate by engaging with the spline, and a tightening bolt 10 is inserted through another washer 9 which is superimposed and fixed on the outside of the washer 8. By screwing into the rotary shaft 2 from the end surface thereof, the pulley 3 and the bearing 6 fitted to the boss portion 3a thereof are press-fixed.

The non-rotatable washer 8 has a diameter that is at least larger than the inner diameter of the bearing 6.

In the configuration as described above, the assembly for attaching the pulley 3 and tight pulley 5 to the rotating shaft 2 first involves attaching the rotating shaft 2
Then, fit the bearing 6 of the tight pulley arm 5 into the boss portion 3a of the pulley 3, and then fit the bearing 6 of the tight pulley arm 5 into the
Simply screw the tightening bolt 10 onto the rotating shaft 2 via the
This work can be done extremely simply, quickly, and reliably.

Of course, during disassembly, the above procedure can be reversed to make the work easier and faster.

Also, the washer 8 holding down the pulley 3 and the bearing 6 is not rotatable with respect to the rotating shaft 2, and the pulley 3
The tightening bolt 10 does not rotate at all due to the rotation of the tightening bolt 10, and natural disassembly of the tightening bolt 10 due to loosening during use can be prevented.

In summary, the present invention includes fitting a pulley non-rotatably to the end of a rotating shaft, fitting a bearing of a tight pulley arm to a boss portion of the pulley so that the end surface of the pulley boss and the end surface of the bearing substantially coincide with each other; , at least a washer with a diameter larger than the inner diameter of the bearing is non-rotatably fitted on the end side of the rotating shaft and brought into contact with the bearing end surface of the pulley boss and the tight pulley arm, and further through another washer fixed to the large diameter washer. A tightening bolt is screwed onto the rotating shaft from the end of the rotating shaft to press and fix the bearings of the pulley and tight pulley arm. can be easily and securely fixed to the rotating shaft with a single tightening bolt through a single washer.Moreover, by making the washer non-rotatable with respect to the rotating shaft, the This has an extremely useful practical effect of eliminating loosening of the tightening bolt and preventing natural decomposition.

[Brief explanation of the drawing]

The drawings show an embodiment of a tight pulley mounting device in a belt transmission mechanism according to the present invention, in which FIG. 1 is a longitudinal sectional side view of the main part, and FIG. 2 is a longitudinal sectional side view of a part thereof. In the figure, 2 is a rotating shaft, 3 is a pulley, 3a is its boss, 4
5 is a tight pulley, 5 is a tight pulley arm, 5a is its boss, 6 is a bearing, 8 and 9 are washers, and 10 is a tightening bolt.

Claims (1)

[Scope of utility model registration request] A pulley is non-rotatably fitted to the end of the rotating shaft, and a bearing of the tight pulley arm is fitted to the boss of the pulley so that the end face of the pulley boss and the end face of the bearing substantially coincide, and the inner diameter of the pulley is at least larger than the inner diameter of the bearing. A washer with a large diameter is fitted non-rotatably to the end of the rotating shaft so as to come into contact with the bearing end surfaces of the pulley boss and the tight pulley arm, and then the rotating shaft is inserted from the end of the rotating shaft through another washer fixed to the large diameter washer. 1. A tight pulley mounting device in a belt transmission mechanism, characterized in that the tightening bolt is screwed into the tightening bolt to press and fix the pulley and the tight pulley arm bearing.