JPH0315875Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pulley coupling, and particularly to a pulley coupling in which the relative rotation angle between the outer member and the inner member is relatively small.

[Prior art]

Pulley couplings generally include an outer member having a pulley groove and an inner member disposed radially inwardly of the outer member.

In conventional pulley couplings of this kind, a ball bearing is provided between the outer member and the inner member, and the action of the ball bearing allows the outer member and the inner member to rotate relative to each other. .

[Problems to be solved by the invention] However, since such conventional devices use ball bearings, it is possible to set a large relative rotation angle between the outer member and the inner member, but on the other hand, A large space is essential for installing the ball bearing between the outer member and the inner member, and as a result, it is not possible to provide sufficient space between the outer member and the inner member, resulting in a large overall size. It had a point. In addition, when the belt is positioned in the pulley groove formed on the outer surface of the outer member, the rubber-like elastic body is located between the outer member and the inner member corresponding to the pulley groove, so the belt can be placed on the outer member using the bearing as a fulcrum. Since a swinging force is applied to the bearing, this causes a twisting force to be applied to the bearing, resulting in a problem in that the overall durability deteriorates.

This invention solves the problems of the conventional ones as described above, and provides a pulley coupling that does not require a large space between the outer member and the inner member and can further improve the overall durability. The purpose is to

[Means for solving problems]

This idea aims to achieve the above objectives.
A pulley coupling comprising an outer member having a pulley groove and an inner member disposed radially inwardly of the outer member, the pulley coupling corresponding to the pulley groove between the outer member and the inner member. A pulley characterized in that a sliding bearing made of a low-friction member is disposed at a position, and a rubber-like elastic body is disposed at a position between the outer member and the inner member that does not correspond to the pulley groove. It consists of a coupling.

[Effect]

By adopting the above-mentioned means, this invention
Compared to the case where a ball bearing is installed between the outer member and the inner member, a smaller space is required, and the overall size can be made smaller.
Furthermore, since the bearings are provided at positions corresponding to the pulley grooves, no twisting force is applied to the bearings, thus improving the overall durability.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

FIG. 1 shows an embodiment of a pulley coupling according to this invention, which comprises an outer member 2 having a pulley groove 1.
and an inner member 3 disposed radially inward of the outer member 2, the pulley groove 1 in the axial direction
Outer member 2 and inner member 3 at positions corresponding to
A sliding bearing 4 made of a low-friction material such as a tetrafluoroethylene resin plate is provided between the two.

Further, a rubber-like elastic body 5 is attached to the outer member 2 and the inner member 3 via sleeves 6 and 7 between the outer member 2 and the inner member 3 at a position offset from the pulley groove 1 in the axial direction. There is.

Next, the operation of the above will be explained.

First, the inner member 3 is attached to, for example, an appropriate rotating shaft (not shown), while a belt (not shown) is stretched between the pulley groove 1 of the outer member 2 and an appropriate member that is to serve as a load for the rotating shaft. Multiply.

With the rotation shaft set in this way,
For example, when started from a stationary state at a predetermined initial speed, the inner member 3 becomes integral with the rotating shaft and starts rotating instantly, but since the outer member 2 is connected to the load member by a belt, It is not possible to start rotating instantly, so the outer member 2
At the start of rotation of the inner member 3, the inner member 3 rotates relative to the inner member 3.

Furthermore, as this relative rotation angle increases, the deformation of the rubber-like elastic body 5 becomes larger, and its elastic restoring force also increases, and the load member is actuated by the elastic restoring force of the rubber-like elastic body 5 that reaches a predetermined level. The torque required for this will be transmitted to the outer member 2, and as a result, the outer member 2 will start rotating after the start of rotation of the inner member 3, and will start the load member via the belt. Further, since the sliding bearing 4 is provided at a position corresponding to the pulley groove 1 of the outer member 2, durability is improved.

In other words, in conventional pulley couplings, a rubber-like elastic body is provided at a position corresponding to the pulley groove, and a ball bearing is provided at a position not corresponding to the pulley groove. When the rubber-like elastic body is deformed, the outer member swings around the ball bearing as a fulcrum, that is, the rubber-like elastic body side of the outer member can swing around the ball bearing as a fulcrum with respect to the inner member. This process is repeated every time a rotational fluctuation occurs in the inner member.

In particular, this problem becomes more noticeable as the load on the load member driven via the belt increases.

On the other hand, in the case of this invention,
Since the sliding bearing 4 is provided in the position corresponding to the pulley groove 1 of the outer member 2, there is a risk that the outer member 2 will swing about the sliding bearing 4 even if the load member driven via the belt is under high load. durability is improved.

That is, this pulley coupling operates as a torque fluctuation absorbing damper.

2 and 3 show another embodiment of the pulley coupling according to this invention, which has a sliding bearing 4 in the axial direction.
and rubber-like elastic body 5, a plurality of radially inward protrusions 8 are formed in the circumferential direction on the outer member 2, and a recess that engages with the protrusions 8 on the inner member 3. 9 are formed in a plurality in the circumferential direction, and are similar to the other pulley couplings shown in FIG. 1, so the same parts as those in FIG. There is.

Next, the operation of the above will be explained.

This pulley coupling 5 functions almost in the same way as the pulley coupling shown in FIG. Since it is limited by the amount of gap in the direction, it is possible to prevent the rubber-like elastic body 5 from breaking due to exceeding this limit, and even within this limit, the rubber-like elastic body 5 can be In the event of one breakage, the outer member 2 can be prevented from flying out to the left in FIG. 2 relative to the inner member 3.

In the above embodiment, the inner member 3 was described as being on the driving side and the outer member 2 as being on the driven side, but it goes without saying that the outer member 2 may be on the driving side and the inner member 3 as being on the driven side. be.

[Effect of idea]

By configuring this idea as described above,
There is no need for a large space between the outer member and the inner member to install the ball bearing as in the conventional one, so as long as a small space can be provided between the outer member and the inner member. Since the pulley coupling can be configured, the overall size can be made small and it can be easily applied to various uses with dimensional restrictions.

Furthermore, even if the load member driven via the belt is under high load, the outer member does not swing around the sliding bearing as a fulcrum, so it has the excellent effect of improving durability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts showing one embodiment of the pulley coupling according to this invention, FIG. 2 is a cross-sectional view of the main parts showing another embodiment of the pulley coupling according to this invention, and FIG. FIG. 2 is a right side view of the one in FIG. 2; DESCRIPTION OF SYMBOLS 1... Pulley groove, 2... Outer member, 3... Inner member, 4... Sliding bearing, 5... Rubber-like elastic body,
6, 7...Sleeve, 8...Protrusion, 9...Recess.

Claims (1)

[Scope of utility model registration request] In a pulley coupling comprising an outer member 2 having a pulley groove 1 and an inner member 3 disposed radially inward of the outer member 2, the A sliding bearing 4 made of a low-friction member is installed at a position corresponding to the pulley groove 1, and a rubber-like elastic body is installed at a position between the outer member 2 and the inner member 3 that does not correspond to the pulley groove 1. A pulley coupling characterized by 5 being arranged respectively.