JPH028127Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to toothed belt transmission, and regarding one of the transmission elements, a toothed pulley,
The purpose of the present invention is to provide a pulley having tooth grooves that prevent dirt from clogging the tooth bottoms.

Conventional technology The positional relationship between the tooth tip line of a conventional toothed belt and the tooth bottom line of a toothed pulley is parallel, and some combinations have been implemented in which the gap is zero or the belt tooth tip interferes with the pulley tooth bottom. However, there is usually a slight gap between the top of the belt tooth and the bottom of the pulley tooth.

It is known that grooves are provided in the bottom of the pulley teeth parallel to the belt tooth tip line to promote drainage of the pulley tooth grooves and prevent noise.

Problems that the invention aims to solve When a toothed belt is used in a dusty or dusty atmosphere, this dust accumulates at the bottom of the pulley teeth, is compressed and fixed at the tips of the belt teeth, and the teeth of the belt ride on this. Become. When the belt runs over the belt, it is no longer wrapped around the pulley in its proper position, causing the pulley and belt to disengage and damage the belt teeth.

Means and Effects for Solving Problems The present invention has an outer circumferential surface of the tooth tip parallel to the axis and a tooth bottom surface inclined in the axial direction, and when the belt is hung, the belt tooth tip and the tooth bottom surface are connected to each other. This problem is solved by a toothed pulley in which a gap is created that extends in the axial direction between the pulleys.

The dust accumulated on the tooth bottom surface as described above is pushed out along the slope in the axial (width) direction of the pulley by the pressing force of the tooth tips of the toothed belt.

Embodiment In FIG. 1, reference numeral 1 is a toothed belt, 2 is a tooth tip of the belt, and 3 and 4 are a pair of toothed pulleys.

The toothed pulley 3 is an example in which a rectangular groove is provided, and as shown in FIG. 2, tooth bottom surfaces 5, 5 inclined in the axial direction are provided on both sides from the center.

This inclined groove may be a groove 6 which is inclined only in one direction as shown in FIG.

On the other hand, the toothed pulley 4 is an example in which a trapezoidal groove is provided, and FIG. 4 shows an example in which inclined surfaces 7, 7 are provided on both sides in the axial direction, as in the case of FIG. 2.

Note that the outer circumferential surfaces of the tooth tips of the pulleys 3 and 4 are parallel to the axis.

Since the tooth bottoms of the pulleys 3 and 4 form slopes 5, 6, and 7, gaps that extend in the axial direction are created between the belt tooth tip 2 and each tooth bottom surface, and the dust accumulated on the tooth bottoms is
It is pushed out along the slopes 5, 6, and 7 in the direction of the arrows in FIGS. 2, 3, and 4 by the pressing force of the belt tooth tips 2. Therefore, dust does not accumulate on the bottom of the pulley teeth, and poor engagement is prevented.

When the flange 8 is attached to the pulley, the inner diameter 9 of the flange 8 is set outside (larger diameter side) than the tooth tip line 2 of the belt to facilitate dust removal, as shown in FIGS.

Effects of the invention Dust that has accumulated on the bottom of the pulley teeth is pushed outward across the width of the pulley by the meshing pressure of the tooth tips of the toothed belt, so there is no accumulation of dust on the bottom of the pulley teeth, so the belt The teeth can always fully mesh with the tooth grooves of the pulley.

[Brief explanation of the drawing]

FIG. 1 shows a front view of the transmission system according to the present invention.
FIG. 2 is a cross-sectional view of a rectangular groove pulley, showing an example in which the inclined tooth grooves are inclined from the center of the pulley width to both sides. Third
The figure is a cross-sectional view of a rectangular groove pulley with the inclined tooth groove inclined to one side, and Figure 4 is a cross-sectional view of a trapezoidal groove pulley.
An example with sloped surfaces on both sides is shown. Figure 5 is a front view when attaching a flange to the pulley, Figure 6 is a front view of the flange attached to the pulley.
FIG. 3, 4... Toothed pulley, 5, 6, 7... Inclined tooth bottom surface.

Claims (1)

[Scope of utility model registration request] It has an outer circumferential surface of the tooth tip parallel to the axis and a tooth bottom surface inclined in the axial direction, so that when the belt is hung, a gap that expands in the axial direction is created between the belt tooth tip and the tooth bottom surface. A toothed pulley characterized by: