CN2304783Y

CN2304783Y - Flexible bearing of miniature synchronous motor rotor

Info

Publication number: CN2304783Y
Application number: CN 97225877
Authority: CN
Inventors: 陈仁琪; 龙金坤
Original assignee: State-Run No210 Factory
Current assignee: State-Run No210 Factory
Priority date: 1997-09-12
Filing date: 1997-09-12
Publication date: 1999-01-20
Anticipated expiration: 2007-09-12

Abstract

The utility model discloses a flexible bearing of a rotor for miniature synchronous motors. The utility model comprises a rotor, a rotor shaft and a bearing. An inner hole of the bearing forms a geometric shape at least, and the diameter size of the hole phi 1 is smaller than the shaft diameter size phi 2 of the rotor shaft. The end surface, which approaches to the interference fit position, of the inner hole wall of the bearing is provided with an annular groove, which causes the hole wall of the bearing to be with good elasticity. The gap between the bearing hole and the rotor shaft is eliminated, and thus the friction between the bearing hole and the rotor shaft is not too large when the rotor freely rotates on the rotor shaft. The noise of the motor is effectively reduced, and the motor normally operates for a long time under the excellent state. The utility model has the advantages of simple structure and difficult deformation.

Description

Small synchronous motor rotor flexibility bearing

The utility model relates to a kind of rotor bearing unit that is used for small synchronous motor, relates in particular to its rotor flexibility bearing.

At present, the general small synchronous motor of Shi Yonging, as the interchange cover pole type permagnetic synchronous motor in the refrigerator frost removal timer, because the excesssive gap between rotor bearing hole and the rotor shaft, produce noise during motor rotation, show by test: when the gap of rotor bearing hole and rotor shaft surpassed 0.03mm, noise will obviously increase, particularly noise often can surpass 30db (A) after the motor long-term work, and the user is difficult to accept.

The utility model purpose is to provide a kind of gap of eliminating between bearing hole and the rotor shaft, reduces the small synchronous motor rotor flexibility bearing of motor noise.

The utility model purpose is achieved in that

It comprises rotor, rotor shaft and bearing, is characterized in: brearing bore has at least one place geometrical shape and aperture size φ ₁Diameter of axle size φ less than rotor shaft ₂, forming the interference fit part, the end face at the close interference fit place of bearing hole wall is provided with annular groove, and shape and size that this annular groove is predetermined make the bearing hole wall have better elastic, and rotor can freely rotate on rotor shaft by bearing.

The utility model is owing to adopt bearing aperture φ ₁Diameter of axle size φ less than rotor shaft ₂, and the groove of reservation shape and wall thickness is set at an end face of bearing hole wall, make the bearing hole wall have the structure of favorable elasticity, realize eliminating the gap of bearing hole and rotor shaft, effectively reduce motor noise, simultaneously, the utlity model has simple in structure, on-deformable advantage.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is an assembling schematic representation of the present utility model;

Fig. 2 makes structural representation of the present utility model;

Fig. 3 is the utility model one example structure schematic representation.

Referring to accompanying drawing, the utility model comprises rotor 1, rotor shaft 2 and bearing 3, and its middle (center) bearing 3 endoporus have place's geometrical shape and aperture size φ ₁Diameter of axle size φ less than rotor shaft 2 ₂, form the interference fit part.End face at the close interference fit place of bearing 3 hole walls is provided with annular groove 4, and shape and size that this annular groove 4 is scheduled to make bearing 3 hole walls have better elastic, and rotor can freely rotate on rotor shaft by bearing.By technique scheme, referring to accompanying drawing 2, bearing 3 adopts the soft engineering plastics to make, and the endoporus of bearing 3 is made taper, and its taper hole small end is of a size of φ ₁, the big end of taper hole is of a size of φ ₃ Annular groove 4 of end face processing at bearing 3 internal taper hole small ends, the shaft section of groove 4 is shaped as trapezoidal, the hole wall at bearing 3 endoporus interference fit places has good elasticity, and bearing 3 inner hole sleeves are rotated on rotor shaft 2, gently binds round on rotor shaft 2 just as elastic cord, thereby realize both having eliminated the gap between bearing hole and the rotor shaft, do not cause friction between the two excessive again, reach and effectively reduce the motor noise purpose, make the motor can long-term normal operation under good state.Referring to accompanying drawing 3, the endoporus of bearing (3) also can be made the garden cylindricality, and place, one end is provided with convex garden ring 5, and the internal diameter size of this convex garden ring 5 is φ ₁, the remaining part place is of a size of φ ₃, other is implemented by technique scheme, can reach the purpose that reduces noise equally.

Claims

1. a small synchronous motor rotor flexibility bearing comprises rotor (1), rotor shaft (2) and bearing (3), it is characterized in that: described bearing (3) endoporus has at least one place geometrical shape and aperture size φ ₁Diameter of axle size φ less than rotor shaft (2) ₂Form interference fit, the end face at the close interference fit place of bearing (3) hole wall is provided with annular groove (4), shape and size that this annular groove (4) is predetermined, make bearing (3) hole wall have better elastic, rotor (1) can be gone up at rotor shaft (2) by bearing (3) and freely rotate.

2. small synchronous motor rotor flexibility bearing according to claim 1 is characterized in that: the endoporus of bearing (3) is a taper, and its taper hole small end is of a size of φ ₁, the big end of taper hole is of a size of φ ₃Perhaps the endoporus of bearing (3) is the garden cylindricality, and place, one end is provided with convex garden ring (5), and the internal diameter size of this convex garden ring (5) is φ ₁

3. small synchronous motor rotor flexibility bearing according to claim 1 is characterized in that: the shape of described annular groove (4) shaft section is trapezoidal or rectangle or half garden shape.

4. small synchronous motor rotor flexibility bearing according to claim 1 is characterized in that: bearing (3) is the soft engineering plastic part.