Modular elevator sheave

A modular elevator sheave comprises a mandrel body, wherein multiple sheave units are arranged side by side along the mandrel body, and wherein, the outer wall of the outer circumference of the sheave unit is provided with a groove. In this structural composition, the mandrel body with multiple sheave units, which increases the overall strength and rigidity of the sheave. Furthermore, the number of sheave unit used can be increase and decrease depending on the need or situation, and it should be noted that since the sheave unit can be replaced individually when damaged, it is easier to maintain and reduce repairing costs.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to sheaves for guiding cables in the elevators, especially to a modular elevator sheave unit.

2. Description of Related Art

Commerical elevators typically use multiple of cable sheaves as part of driving system to operate elevetor cart. A typical elevator sheave is shown asFIG. 1, it generally comprises a mandrel body having a bearing on both ends, and a sheave unit is attached to the bearing. The sheave unit may have multiple grooves between two flanges around its circumference for which the drive elements of a commerical elevator, such as ropes, cables or belts that run over the sheave unit inside the grooves. Typically, the number of grooves inside the sheave unit is fixed so that the number of drive elements can be used is limited to the number of grooves. In addition, because the speed of each drive elements that run over the grooves might be inconsistent which causes slips among the drive elements, which would generate noise and shorten usage life of the sheave unit or drive elements.

SUMMARY OF THE INVENTION

The present invention provides a solution to the above-identified problems by providing a modular elevator sheave. The sheave comprises a mandrel body, where multiple sheave units are provided on the mandrel body to increase the strength and rigidity of the overall sheave. More specific,the number of sheave units provided on the mandrel body can be easily increased and decreased depending on the need. Furthermore, the sheave units can be replaced individually when damaged, therefore, simplified the overall sheave design, and it is easier to maintain and reduce repairing costs.

In order to achieve above-identified benefits, the present invention provides a modular elevator sheave comprises a mandrel body and multiple sheave units arranged side by side along the mandrel body. Wherein, a groove is provided about the center of the outer wall of the outer circumference of the of each sheave units. Wherein, the inner wall of the inner circumference of the sheave unit and the outer wall of the mandrel body forms a transit fit for the selected drive element.

Wherein, the end faces of the inner circumference of any two adjacent sheave units are oppressed with each other, and the end faces of the outer circumference of any two adjacent sheave units are apart from each other.

Wherein, the sheave unit comprises an outer circumference, an inner circumference, a fixing frame, two rows of ball body and a seal ring. The seal ring is provided in between the outer circumference and the inner circumference, and the two rows of ball body are provided on respectively on the grooves of the two ends of the sheave unit and the fixing frame secures the two rows of ball body within the sheave unit.

Wherein, the groove bottom of groove of the outer circumference is curved and the angle between the groove bottom and the two side wall of the groove is a curved transition fit wall.

The inner walls of the two end faces of the outer circumference1and the inner circumference are provided with installation grooves, wherein, the seal ring is embedded within the respective installation groove, wherein, the seal ring is clamped in between the outer circumference and the inner circumference.

The mandrel body is provided with multiple abrasion resistance paddings, the abrasion resistance padding are arranged in between the end faces of the inner circumferences of any two adjacent sheave unit.

The advantages that the present invention provides are: comparing to the current structure characteristics, the present invention provides the mandrel body with multiple sheave units, which increases the overall strength and rigidity of the sheave. Furthermore, the number of sheave unit used can be increase and decrease depending on the need or situation, and it should be noted that since the sheave unit can be replaced individually when damaged, it is easier to maintain and reduce repairing costs.

DETAILED DESCRIPTION OF THE INVENTION

As shown inFIG. 2andFIG. 3, the present invention a modular elevator sheave comprises a mandrel body10, wherein multiple sheave units20are arranged side by side along the mandrel body10, and wherein, the outer wall of the outer circumference1of the sheave unit20is provided with a groove11.

As a preferred embodiment, the inner wall of the inner circumference2of the sheave unit20and the outer wall of the mandrel body10forms a transit fit for the selected drive element.

As a preferred embodiment, the end faces of the inner circumference2of any two adjacent sheave units20are oppressed with each other, and the end faces of the outer circumference1of any two adjacent sheave units20are apart from each other.

As a preferred embodiment, the sheave unit20comprises an outer circumference1, an inner circumference2, a fixing frame3, two rows of ball body4and a seal ring5. The seal ring5is provided in between the outer circumference1and the inner circumference2, the two rows of ball body4is respectively provided on the left and right side of inner groove12of the outer circumference1and the left and right side of outer grooves21of the inner circumference2. Wherein, the fixing frame3secures the two rows of ball body4in between the outer circumference and the inner circumference.

As a preferred embodiment, the groove bottom111of the groove11of the outer circumference is curved, and the angle between the groove bottom111and the two side wall of the groove11is a curved transition fit wall112.

As a preferred embodiment, the inner walls of the two end faces of the outer circumference1and the inner circumference2are provided with installation grooves6, wherein, the seal ring5is embedded within the respective installation groove6, wherein, the seal ring5is clamped in between the outer circumference1and the inner circumference2.

As a preferred embodiment, the mandrel body10is provided with multiple abrasion resistance paddings7, the abrasion resistance padding7are arranged in between the end faces of the inner circumferences2of any two adjacent sheave unit20.

As a preferred embodiment, multiple sheave units20are arranged side by side along the mandrel body10. Jump rings can be used on the two ends of the mandrel body10to secure the sheave units20with the mandrel body10. Other securing methods, such as panel fixing can be adapted, however, these methods may be considered as current arts and will not be discussed.

As described above, the present invention provides the mandrel body10with multiple sheave units20, which increases the overall strength and rigidity of the sheave unit. Furthermore, the number of sheave unit20used can be increase and decrease depending on the need or situation, and it should be noted that since the sheave unit20can be replaced individually when damaged, it is easier to maintain and reduce repairing costs.

Furthermore, the present invention provides that the groove bottom111of groove11of the outer circumference1is curved and the angle between the groove bottom111and the two side wall of the groove11is a curved transition fit wall112, which, reduces the friction of the drive element on the groove bottom111and increases usage life of the sheave unit20.

Furthermore, the present invention provides the abrasion resistance paddings7arranged in between the end faces of the inner circumferences2of any two adjacent sheave unit20, which reduces the friction between any two adjacent sheave units20and further increases usage life of the sheave unit20.