TWM503500U - Synchro driving pulley - Google Patents

Description

Synchronous drive pulley

The present invention relates to a pulley, and more particularly to a synchronous drive pulley.

The synchronous drive pulley drive is composed of a closed annular timing belt with an equal pitch tooth on the inner peripheral surface and a corresponding pulley. As shown in Fig. 3, the timing belt 8 is fitted around the circumference of the two pulleys 7. When the entire apparatus is in operation, the teeth of the timing belt 8 mesh with the slots of the pulley 7 to transmit power, which is an engagement transmission. At the same time, in order to prevent the timing belt 8 from axially swaying or sliding out of the pulley 7 during the transmission process, a rib 9 is generally added on both sides of the pulley 7 to improve the reliability of the operation of the entire device.

The above-mentioned conventional synchronous drive pulley transmission mode causes the air in the tooth groove of the pulley to be suddenly squeezed when the toothed belt of the timing belt meshes with the tooth groove of the pulley, forcing the air to be discharged from the tooth groove of the pulley, because it is an instantaneous shock. The force will make a sound, which will cause greater noise pollution. When the high rotational speed is reached, that is, the rotational speed is 10,000 rpm to 15000 rpm, the noise generated is more pronounced. The analysis of the noise spectrum generated by the synchronous drive pulley shows that the generation of noise is related to the meshing frequency of the cogging and the harmonic frequency of the meshing frequency. At the same time, the impact force generated instantaneously when the toothed belt of the timing belt meshes with the tooth groove of the pulley has a large impact stiffness, which greatly reduces the service life of the timing belt and the pulley.

The technical problem to be solved by the present invention is to provide a synchronous drive pulley that reduces noise generated when the synchronous drive pulley is driven.

In order to solve the above problems, the synchronous drive pulley has gear teeth on the outer peripheral surface of the pulley, and an annular groove is provided along the outer circumferential surface of the entire pulley in the middle of the gear teeth of the pulley, and the annular groove divides the gear teeth of the pulley. For the first gear tooth portion and the second gear tooth portion, the tooth pitch between the teeth of the first gear tooth portion is P, and the tooth tooth extending direction of the first gear tooth portion is linear with the pulley shaft axis. The angle a is formed, the pitch between the teeth of the second gear portion is P', and the direction in which the teeth of the second gear portion extend is at an angle a' with the axial line of the pulley.

According to an embodiment of the present creation, the groove width of the annular groove is greater than 0.5 mm and less than one third of the width of the outer circumferential surface of the pulley.

According to one embodiment of the present creation, the annular groove has a groove depth of less than 50 mm.

According to an embodiment of the present creation, the inter-tooth pitch P of the first gear tooth portion is equal to the inter-tooth tooth pitch P' of the second gear tooth portion.

According to an embodiment of the present creation, the angle value of the included angle a is the same as the angle value of the included angle a', and the gear extending direction of the first gear portion and the gear extending direction of the second gear tooth portion are different.

According to an embodiment of the present invention, the teeth of the first toothed portion and the teeth of the second toothed portion are offset from each other on both sides of the annular groove.

According to an embodiment of the present invention, the teeth of the first gear tooth and the teeth of the second gear tooth are symmetrically arranged on both sides of the annular groove.

The present invention provides an annular groove with a muffling effect in the middle portion of the outer peripheral surface of the pulley, which effectively alleviates the impact force generated by the synchronous drive pulley when the cogging is engaged in the high-speed running transmission, and reduces the working noise during the transmission. , which improves the life of the timing belt and pulley.

5‧‧‧ annular groove

6‧‧‧ Gears

61‧‧‧First gear

62‧‧‧Second gear

7‧‧‧ Pulley

8‧‧‧Synchronous belt

9‧‧‧ ribs

P, P’‧‧‧ pitch

a, a’‧‧‧ angle

Fig. 1 is a schematic view showing the structure of the pulley of the present invention; Fig. 2 is a structural view showing the outer peripheral surface of the pulley of the present invention; and Fig. 3 is a view showing the state of use of the pulley in the prior art.

In order to further understand the present invention, a detailed description of the specific embodiments will be made below in conjunction with the accompanying drawings.

Figure 1 is a schematic view of the structure of the present pulley. As shown in Fig. 1, the outer peripheral surface of the pulley 7 has teeth 6, and an annular groove 5 is provided along the outer peripheral surface of the entire pulley 7 between the teeth 6 of the pulley 7, and the annular groove 5 divides the teeth of the pulley. It is the first gear tooth portion 61 and the second gear tooth portion 62. The inter-tooth pitch of the first gear portion 61 is P, and the inter-tooth pitch of the second gear portion is P', where the pitch refers to the pitch of the adjacent two teeth on the pitch circle. The teeth of the first tooth The extending direction forms an angle a with the pulley shaft center line, and the tooth extending direction of the second gear tooth portion forms an angle a with the pulley shaft center line.

Preferably, the annular groove has a groove width greater than 0.5 mm and less than one third of the width of the outer circumferential surface of the pulley.

Preferably, the annular groove has a groove depth of less than 50 mm. By designing the annular groove 5 in this manner, a better noise cancellation effect can be obtained.

Preferably, the inter-tooth pitch P of the first gear portion 61 is equal to the inter-tooth pitch P' of the second gear portion 62.

Further, the teeth of the first gear tooth portion 61 and the gear teeth of the second gear tooth portion 62 are offset from each other on both sides of the annular groove. As shown in Fig. 2, the teeth of the first tooth portion 61 and the teeth of the second gear portion 62 are offset from each other by an angle on both sides of the annular groove 5. According to another alternative of the present creative embodiment, the angle value of the angle a is the same as the angle value of the angle a', and the gear extending direction of the first gear portion 61 and the gear extending direction of the second gear portion 62 are different to obtain more Good meshing effect.

Although FIGS. 1 and 2 show that the teeth of the first gear tooth portion 61 and the teeth of the second gear tooth portion 62 are offset from each other on both sides of the annular groove, it is understood that another one not shown in the drawing In an embodiment, the teeth of the first gear tooth and the teeth of the second gear tooth may also be symmetrically arranged on both sides of the annular groove, that is, the teeth of the first gear tooth and the teeth of the second gear tooth The teeth are aligned one to one on both sides of the annular groove without an angle that is offset from each other.

The present invention provides an annular groove with a muffling effect in the middle portion of the outer peripheral surface of the pulley, so that the transmission can be made lighter and quieter, and the transmission efficiency and performance are maximized. At high speeds (10,000 rpm - 15,000 rpm), the noise is reduced by 10 decibels compared to the use of a conventional pulley, reducing vibration. This creation is widely used in automotive, textile, printing and packaging equipment, sewing equipment, office equipment, laser engraving equipment, tobacco, financial equipment, stage lighting, communication food machinery, medical machinery, steel machinery, petrochemical, instrumentation, various precision Various technical fields such as machine tools.

The embodiment of the present creation has been described in detail above with reference to the accompanying drawings, but the present creation is not limited to the above embodiment. The present invention is disclosed in the above preferred embodiments, but it is not intended to limit the present invention, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. The scope of protection should be based on this creation The scope defined by the scope of patent application shall prevail.

5‧‧‧ annular groove

6‧‧‧ Gears

61‧‧‧First gear

62‧‧‧Second gear

7‧‧‧ Pulley

Claims (7)

A synchronous drive pulley, wherein an outer peripheral surface of the pulley has teeth, and an annular groove is provided along an outer circumferential surface of the entire pulley between the teeth of the pulley, the annular groove is a tooth of the pulley Dividing into a first gear tooth portion and a second gear tooth portion, the inter-tooth tooth pitch of the first gear tooth portion is P, and the tooth tooth extending direction of the first gear tooth portion is formed with the pulley shaft center line An angle a, the inter-tooth pitch of the second gear portion is P', and the tooth extension direction of the second gear portion forms an angle a' with the pulley axis. The synchronous drive pulley of claim 1, wherein the annular groove has a groove width greater than 0.5 mm and less than one third of a width of the outer circumferential surface of the pulley. The synchronous drive pulley of claim 1, wherein the annular groove has a groove depth of less than 50 mm. The synchronous drive pulley according to claim 1, wherein the inter-tooth pitch P of the first gear portion is equal to the inter-tooth pitch P' of the second gear portion. The synchronous drive pulley of claim 4, wherein an angle value of the angle a is the same as an angle value of the angle a', and a gear extension direction of the first gear portion and the second The gear teeth of the gear teeth extend in different directions. The synchronous drive pulley of claim 4, wherein the teeth of the first gear tooth and the teeth of the second gear tooth are offset from each other on both sides of the annular groove. The synchronous drive pulley of claim 4, wherein the teeth of the first gear tooth and the teeth of the second gear tooth are symmetrically arranged on both sides of the annular groove.