Shaft assembling structure

A shaft assembling structure includes a shaft hole formed on a motor rotor and a shaft with a shaft end sheathed on a shaft hole of the motor rotor. The shaft assembling structure further includes a direction setting member secured to the top of the motor rotor and embedded with the shaft, and at least one direction setting member disposed at the bottom of the shaft assembling structure and extended into the first direction setting portion of shaft hole. The shaft end of the shaft includes at least one second direction setting portion embedded into the corresponding first direction setting portion. When the second direction setting portion is aligned precisely with the first direction setting portion, the shaft hole of the motor rotor is sheathed on the shaft end of the shaft to facilitate the process of recognizing and confirming the rotating direction of the shaft.

FIELD OF THE INVENTION

The present invention relates to an assembling structure of a shaft and a motor rotor, in particular to the shaft assembling structure capable of setting the center and direction between the shaft and the motor rotor.

BACKGROUND OF THE INVENTION

In general, an electric compressor provided for compressing a coolant and circulating the compressed coolant in a circuit is driven by a DC motor coupled to the compressor, so as to achieve the effects of compressing and circulating the coolant. Different internal compression mechanisms include various models of rotary compressors, scroll compressors and screw compressors.

Wherein, the scroll compressor has the issue of a relatively difficult manufacturing process and incurs a high cost. Although both rotary compressors and screw compressors complete a compression process by changing the volume of a compression chamber, the rotary compressors adopt a simple compression method and skillfully avoid the problems including the deviation of the screw compressors caused a force exertion in an axial direction, the clearance volume, and the internal leakage, so as to improve the reliability and performance of the equipments and accomplish a relatively higher market share.

In a rotary compressor as shown inFIG. 1, an eccentric shaft11is installed to the center of the motor rotor12, such that when the eccentric shaft11rotates with the motor rotor12to turn around in a housing13, the eccentric shaft11and a cylinder wall form a series of compression chambers of different volumes to achieve the effect of compressing the coolant progressively. In the operation of the rotary compressors, the cylinder is compressed by an eccentric method, so that there are issues of having vibrations and increasing the torque.

Although some motor rotors12of the conventional rotary compressors comes with a weight14to inhibit the vibration caused by the eccentric rotation, yet when the eccentric shaft11is installed to the motor rotor12, the level of difficulty of setting the center and direction of the eccentric shaft11is increased. Therefore, it is a main subject for related manufacturers to design and develop a mechanism for setting the center and the direction between the eccentric shaft and the motor rotor quickly to improve the assembling quality and production capacity of the rotary compressors.

SUMMARY OF THE INVENTION

Therefore, it is a primary objective of the present invention to overcome the aforementioned problem of the prior art by providing a shaft assembling structure capable of setting the center and direction between the shaft and the motor rotor quickly.

To achieve the aforementioned objective, the present invention provides a shaft assembling structure comprising a motor rotor with a shaft hole formed thereon, and a shaft with a shaft end sheathed on a shaft hole of the motor rotor, characterized in that the shaft assembling structure comprises a direction setting member secured to the top of the motor rotor and embedded to the shaft, and the direction setting member includes at least one first direction setting portion disposed at the bottom of the direction setting member and extended into the shaft hole, and the shaft end of the shaft has at least one second direction setting portion embedded with the corresponding first direction setting portion.

With the aforementioned technical characteristics of the shaft assembling structure of the present invention, the second direction setting portion of the shaft must be aligned precisely with the first direction setting portion of the direction setting member before the shaft hole of motor rotor is sheathed on the shaft end of the shaft to confirm the rotating direction of the shaft quickly during an assembling process, so as to obtain a stable rotation of the shaft, and when the second direction setting portion and the first direction setting portion are embedded with each other, the relative rotation of the shaft and the motor rotor is limited so that the motor rotor and the shaft can be assembled and connected more securely and reliably.

Specifically, the shaft assembling structure of the present invention is provided for installing the shaft in the correct rotating direction for sure during the process of connecting the direction setting member and the shaft, so that the motor rotor and the shaft may have a stable and smooth operation. Further, the shaft assembling structure includes a plurality of first direction setting portions and second direction setting portions, and each first direction setting portion and each second direction setting portion may come with a design of significantly different widths, so that assemblers can recognize and confirm the rotating direction of the shaft quickly. The invention is particularly applicable for assembling the eccentric shaft and motor rotor of the rotary compressor to improve the assembling quality and production capacity of the rotary compressor.

The present invention will become clearer in light of the following detailed description of an illustrative embodiment of this invention described in connection with the drawings. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference toFIGS. 2 to 4for an exploded view, a top view and a schematic view of a shaft assembling structure of the first preferred embodiment of the present invention capable of quickly setting the center and direction between the shaft and the motor rotor respectively, the shaft assembling structure comprises a shaft hole21formed on a motor rotor20and a shaft end of a shaft30sheathed on the shaft hole21of the motor rotor20.

The shaft assembling structure includes a direction setting member40secured to the top of the motor rotor20and embedded with the shaft30, and at least one first direction setting portion41disposed at the bottom of the direction setting member40and extended into the shaft hole21. The shaft end of the shaft30includes at least one second direction setting portion31embedded with the corresponding first direction setting portion41.

In this preferred embodiment, the direction setting member40includes a plurality of first direction setting portions41with different widths, and the shaft30includes a plurality of second direction setting portions31disposed at the shaft end and corresponsive to the first direction setting portions41respectively, and each second direction setting portion31has a width capable of embedding with the corresponding first direction setting portion41precisely. The first direction setting portion41as shown in the figure is a bump with a predetermined height protruding from the bottom of the direction setting member40, and each second direction setting portion31is a slot with a predetermined depth penetrating into an end surface of the shaft30. Of course, each first direction setting portion may be a slot with a predetermined depth penetrating into the bottom of the direction setting member, and each second direction setting portion is a bump with a predetermined height protruding into an end surface of the shaft to achieve the same embedding effect.

During an application of the shaft assembling structure of the present invention, the second direction setting portion31of the shaft30must be aligned precisely with the first direction setting portion41of the direction setting member40before the shaft hole21of the motor rotor20is sheathed on the shaft end of the shaft30, so that the rotating direction of the shaft can be confirmed quickly during the assembling process, and the shaft can be rotated stably. In addition, when the second direction setting portion31and the first direction setting portion41are embedded, the relative rotation of the shaft30and the motor rotor20is limited to achieve the effect of obtaining a stable and reliable assembling effect of the motor rotor20and the shaft30.

In the shaft assembling structure of the present invention, the direction setting member40includes a first screw through hole42corresponsive to the center of the shaft end of the shaft30, and the shaft30has a first screw hole32formed at the center of the shaft end and a first screw51passed into the first screw through hole42of the direction setting member40and screwed into the first screw hole32of the shaft30to improve the effect of connecting the shaft30and the direction setting member40. Similarly, the motor rotor20includes a plurality of second screw holes22formed at corresponding positions other than the shaft hole21, and the direction setting member40includes a plurality of second screw through holes43corresponsive to the second screw holes22respectively and a plurality of second screws52passed into the second screw through holes43of the direction setting member40and screwed into the second screw holes22of the motor rotor20respectively to achieve the effect of securing the direction setting member40to the top of the motor rotor20for sure.

Compared with the conventional structure, the shaft assembling structure of the present invention confirms the installation of the shaft to the correct rotating direction during the process of connecting the direction setting member and the shaft, so that the motor rotor and the shaft obtain a stable and smooth operation. Further, the invention comprises a plurality of first direction setting portions and second direction setting portions, and each first direction setting portion and each second direction setting portion come with the design of having significantly different widths, so that assemblers can recognize and confirm the rotating direction of the shaft quickly.

It is noteworthy that the shaft assembling structure of the present invention is particularly applicable for assembling the eccentric shaft and motor rotor of the rotary compressor. InFIG. 4, the shaft30is manufactured into a rotary eccentric shaft inside a housing60, and a weight70may be installed on the motor rotor, or the direction setting member40includes at least one weight portion44disposed thereon as shown inFIGS. 5 and 6. In an application, the at least one weight portion44may be a bump protruding from a surface of the direction setting member40(or a slot penetrating into a surface of the direction setting member), and the shaft30and the motor rotor20may have a better weight distribution effect through the weight portion44. Such arrangement not just provides a stable and smooth operation of the motor rotor and shaft (or the eccentric shaft) of the rotary compressor only, but also improves the assembling quality and the production capacity of the rotary compressor.