JPH0326348Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pulley that prevents static electricity from being charged due to friction of a power transmission belt.

[Prior art] Conventionally, pulleys that prevent static electricity generated by belt friction have been used to produce pulleys that are liquid at atmospheric temperature or
A small pulley made of a porous material impregnated with an antistatic agent that becomes fluid when heated above atmospheric temperature has been proposed (Japanese Patent Laid-Open No. 57-54773).

With this pulley, the antistatic agent impregnated into the pulley gradually moves to the outer periphery and adheres to the belt due to the centrifugal force that accompanies rotation, so the antistatic effect is as early as when simply applying antistatic agent to the belt. It has the advantage of not disappearing and maintaining its effects over a long period of time.

[Problems to be Solved by the Invention] However, the small pulley mentioned above has a problem in that the antistatic agent tends to evaporate when used in an open atmosphere because the parts other than the part that contact the belt are exposed to the atmosphere.

In addition, if the antistatic agent evaporates in the small pulley mentioned above, it is necessary to remove the pulley and impregnate it with antistatic agent again, or replace it with a new pulley impregnated with antistatic agent, so it is necessary to update the antistatic effect. At times, it was troublesome to have to attach and detach the belt and pulley.

The purpose of this invention is to provide an antistatic pulley that prevents static electricity generated by friction of a power transmission belt, prevents the adhesion of fine dust, delays the progression of belt wear, and extends the life of the belt. There is a particular thing.

Another object of the present invention is to provide an antistatic pulley in which the antistatic agent is less likely to evaporate and the antistatic effect can be maintained for a longer period of time, and the antistatic effect can be easily updated. It is in.

[Means for Solving the Problems] In order to achieve the above object, the antistatic pulley of the present invention intersects the pulley groove 15 on which the belt 16 is hung and has a bottom portion 15a of the pulley groove 15, as shown in FIG. A bottomed hole 17 communicating with the bottom hole 1 is provided in the pulley body 14 with a female thread 17a formed at its opening, and a rod-shaped body 18 impregnated with an antistatic agent is connected to the bottomed hole 1.
7 and the bottom 15a of the pulley groove 15.
The bolt 19 is inserted so as to face the belt 16, and the bolt 19 is screwed into the female thread 17a to fix the rod-shaped body 18 inserted into the bottomed hole 17.

[Function] When the pulleys 11 to 13 do not rotate, the rod-shaped body 18 is covered with the belt 16 and does not come into contact with the atmosphere.
Antistatic agents are difficult to evaporate. When the pulley 12 rotates, the antistatic agent impregnated in the rod-shaped body 18 oozes into the pulley groove 16 due to the centrifugal force. The hygroscopicity and ionicity of this oozing antistatic agent increase the conductivity of the surface of the pulley groove 15, dissipate static electricity that would otherwise build up on the pulley body 14 into the atmosphere, and prevent the pulley body 14 from being charged. do. When the antistatic agent evaporates, the bolt 19 is removed and replaced with a new rod-shaped body 18.

[Example] Next, an example of the present invention will be described in detail based on the drawings.

As shown in FIG. 5, a crank pulley 11, a coolant pump pulley 12, and an alternator pulley 13 are provided at the front of the engine 10. In this example, seven pulley grooves 15 are formed in these pulleys 11 to 13, as shown in FIG. Form.

Figures 1 to 4 show the coolant pump pulley 12.
It is an enlarged view of. Two bottomed holes 17 are drilled into the pulley body 14 from the front of the pulley 12 using a drill (FIG. 2). The bottomed hole 17 is perpendicular to the pulley groove 15 and communicates with the bottom 15a of the pulley groove 15. A rod-shaped body 19 impregnated with an antistatic agent is removably inserted into the bottomed hole 17. The rod-shaped body 18 is made of a fiber aggregate such as a felt core, and is attached to the belt 1 at the bottom 15a of the pulley groove 15.
It is inserted so that it faces 6. As the antistatic agent, a sulfate ester salt type anionic surfactant, a phosphate ester salt type anionic surfactant, a quaternary ammonium salt type cationic surfactant, etc. can be used.

A female thread 17a is formed at the opening of the bottomed hole 17, and the rod-shaped body 18 inserted into the bottomed hole 17 is fixed by screwing a bolt 19 into this female thread 17a.
The crank pulley 11 and alternator pulley 13 shown in FIG. 5 are also constructed in the same manner as the coolant pump pulley 12.

The pulleys 12 and 13 configured in this way are
When the crank pulley 11 rotates, the V-belt 16
Rotate through. At this time, these pulleys 11
The side surfaces of the V-belt 16 come into contact with the side surfaces of the grooves 13 to 13 and cause intense friction, and this friction transmits rotational force. At the same time, static electricity is generated between the V-belt 16 and the pulley groove 15. On the other hand, pulley 11~
The antistatic agent impregnated in the rod-shaped body 18 oozes into the pulley groove 15 due to the rotational centrifugal force of the rod-shaped body 13 .

As a result, a film of antistatic agent is formed on the surface of the pulley groove 15, which becomes hygroscopic and ionic, increasing conductivity. Therefore, static electricity generated by friction with the V-belt 16 is released from the pulley groove surface into the atmosphere. Dissipate. Thereby, even if fine dust flies up around the engine 10, the pulleys 11 to 13 are prevented from being charged, so that the dust does not adhere to the pulleys 11 to 13.

When the pulleys 11 to 13 do not rotate, the rod-shaped body 18 is covered with the belt 16 and does not come into contact with the atmosphere, so that the antistatic agent is difficult to evaporate. Also, the rod-shaped body 18
Once the antistatic agent has evaporated, the bolt 19 provided at the front of the pulley is removed and replaced with a new rod 18 impregnated with the antistatic agent.

Although the above example shows an example in which the number of rod-shaped bodies 18 is two, the number can be increased or decreased depending on the diameter of the pulley.

In addition, the shape of the pulley is not limited to V-pulleys on which poly V-belts with a large number of V-shaped ridges are hung, but can also be applied to other pulleys that generate a large amount of static electricity due to friction depending on the shape and material of the belt. can.

[Effects of the invention] As described above, according to the invention, the antistatic agent oozes into the pulley groove due to the centrifugal force of the pulley, so the pulley surface becomes hygroscopic and ionic, increasing conductivity. Static electricity generated on the pulley due to friction is dissipated into the atmosphere due to these properties. As a result, it is possible to prevent fine dust from adhering to the
It is possible to delay the progression of belt wear and extend the life of the belt.

In particular, since the rod-shaped body is inserted into the bottomed hole and fixed with bolts, unlike conventional antistatic pulleys, the antistatic agent is less likely to evaporate and the antistatic effect can be maintained for a longer period of time. Further, unlike conventional antistatic pulleys, there is no need to attach or detach belts or pulleys, and the antistatic effect can be easily updated by simply attaching and detaching bolts.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a pulley according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line A-A. FIG. 3 is an enlarged sectional view of the main part of FIG. 1. FIG. 4 is a plan view of the main part of FIG. 3. FIG. 5 is a front view of an engine showing a belt train of a pulley according to an embodiment of the present invention. 11, 12, 13: pulley, 14: pulley body, 15: pulley groove, 15a: bottom of pulley groove,
16: Poly V belt, 17: Bottomed hole, 18: Rod-shaped body, 19: Bolt.

Claims (1)

[Claims for Utility Model Registration] A bottomed hole 17 intersecting the pulley groove 15 on which the belt 16 is hung and communicating with the bottom 15a of the pulley groove 15 is provided in the pulley body 14 with a female thread 17a formed at the opening thereof. A rod-shaped body 18 impregnated with an antistatic agent is removably inserted into the bottomed hole 17 so as to face the belt 16 at the bottom 15a of the pulley groove 15, and a bolt 19 is screwed into the female thread 17a. An antistatic pulley configured to fix the rod-shaped body 18 inserted into the bottomed hole 17.