KR19980069703A - Spindle motor with herringbone type dynamic bearing - Google Patents

Abstract

The present invention relates to a spindle motor having a herringbone type dynamic bearing. The main object of the present invention is a herringbone type dynamic bearing, in which the bearing oil driven in the outer circumferential direction by centrifugal force is returned to the motor shaft (1) direction. And another purpose is to allow any amount of bearing oil to be pre-filled in consideration of the life of the motor.

A characteristic configuration for this purpose is to be installed between the rotor and the motor shaft, but has a disc fixed to the top of the motor shaft with herringbone grooves on the top and bottom, its disc saddle extension and disc intermittent leverlin seal on the top. It provides a herringbone type dynamic bearing, oil moving means for moving the bearing oil from the outer peripheral surface of the disc to the surface of the motor shaft, and oil holding means for allowing the bearing oil to remain on the outer peripheral surface of the disc It is provided to enable the holding of the bearing oil and the circulation of the bearing oil in the herringbone structure described above.

Description

Spindle motor with herringbone type dynamic bearing

1 is a front sectional view showing a conventional herringbone type hydrodynamic bearing,

2 is a cross-sectional view taken along line A-A of FIG.

3 is a front sectional view of a dynamic bearing according to the present invention,

4 is a cross-sectional view taken along line B-B of FIG.

5 is a partial cross-sectional view showing the oil movement and pressure state of the present invention,

6 is an enlarged plan sectional view showing a part of FIG.

7 is a perspective view showing a disc of the herringbone structure of the present invention,

8 is a partially enlarged view showing the oil holding means of the present invention.

* Description of the symbols for the main parts of the drawings *

1: motor shaft 4: dynamic bearing

7: Original 8: Oil transport

9: oil holding means 71: herringbone home

72, 73: upper and lower clearances 81: through

82: vertical groove 83: annular groove

91: Chihom

The present invention relates to a spindle motor having a herringbone type dynamic bearing, and is particularly characterized in that the bearing oil required for the herringbone structure can be stored and circulated.

Herringbone type dynamic bearing is as shown in FIG.

That is, in the spindle motor composed of the stator assembly 2, the motor shaft 1 placed in the center of the stator assembly, and the rotor assembly 3 fixed to the upper end of the motor shaft, the rotor assembly 3 described above. The dynamic pressure bearing 4 is interposed between the housing 31 of the motor shaft 1 and the motor shaft 1, wherein the dynamic pressure bearing 4 has a cylindrical portion 41 into which the lower half of the motor shaft 1 is fitted. The expansion part 42 is provided with a disc 6 seated on the upper end of the motor shaft 1, and the labyrinth seal 5 above the disc has a dynamic pressure as described above. It is fitted to the upper end of the bearing (4), the V-shaped grooves are repeatedly formed radially on the upper and lower surfaces of the disc (6), the dynamic pressure is applied to the upper and lower clearances (61, 62) of the disc. It is the bearing of the Heshoku structure that made it happen.

Thus, the dynamic bearing 4 having a herringbone structure becomes a radial bearing in the horizontal direction by the lower half of the motor shaft 1 fitted to the cylindrical portion 41, and is fixed to the upper half of the motor shaft 1. Since the disc 6 is fitted in the expansion part 42 of the dynamic bearing 4, it becomes a bearing in the vertical direction.

Since the V-shaped grooves, that is, herringbone grooves 63 are arranged radially on the upper and lower surfaces of the disc 6 as shown in FIG. 2, the disc 6 has upper and lower gaps 61 and 62. The oil filled in the) generates dynamic pressure in the vertical direction, and the vertical dynamic pressure at this time solves the frictional force.

However, the conventional herringbone type dynamic bearing has the following disadvantages.

That is, it is difficult to maintain the bearing oil in a uniform state due to the input difference in the outer circumferential direction and the inner circumferential direction.

In other words, when the motor is driven at a high speed, the centrifugal force acting on the oil of the upper and lower clearances 61 and 62 is increased, and thus the oil is scattered at the outer peripheral portion of the disc 6, and the scattered oil is It becomes difficult to return to the upper and lower clearances 61 and 62 again.

On the other hand, the oil gathered on the outer circumference may flow back into the upper and lower gaps 61 and 62 by capillary action when the motor stops, but the oil gathered in the gap 64 on the outer circumferential surface of the disc 6 may be Since it is almost impossible to pass through the edge of the disc 6, it is a great reason for the deterioration of motor performance and shortening of life.

Therefore, the present invention has been made to solve the various problems of the prior art as the main object of the invention in the herringbone type dynamic bearing, the bearing oil driven in the circumferential direction by centrifugal force back to the motor shaft (1) direction Another purpose is to allow a certain amount of bearing oil to be pre-filled in consideration of the life of the motor.

And a characteristic configuration for this is a spindle motor consisting of a stator assembly, a motor shaft placed in the center of the stator assembly, and a rotor assembly fixed on the top of the motor shaft, which is installed between the rotor and the motor shaft, A herringbone type dynamic pressure bearing is provided on the upper side and the lower side with a herringbone groove on the upper side of the motor shaft, and a herringbone type dynamic pressure bearing having the upper disc saddle extension part and the disc intermittent leverlin seal on the upper side. Oil holding means for moving the bearing oil from the surface of the motor shaft to the surface of the motor shaft, and oil holding means for allowing the bearing oil to remain on the outer circumferential surface of the disc. It is to enable circulation.

Hereinafter, the configuration and operation of the present invention according to the accompanying drawings in detail as follows.

3 shows an example of a spindle motor according to the present invention, a stator assembly 2, a motor shaft 1 fixedly fixed at the center thereof, and a rotor assembly rotatably fixed on the upper end of the motor shaft 1. It can be seen that it consists of a bree (3).

The dynamic pressure bearing 4 of the present invention is interposed between the motor shaft 1 and the rotor housing 31, and has a herringbone structure.

That is, the lower half of the bearing is a radial bearing 3a into which the motor shaft 1 is directly fitted, and the upper half is a rust bearing 3b including a herringbone structure.

The horizontal portion 3b is composed of a disc 7 fixed on the upper end of the motor shaft 1 and a dynamic pressure bearing 4 in which the expansion part 41 is considered so that the disc can be saddled. The labyrinth seal 5 which closes the said disc 7 is provided in the upper part of a bearing.

At this time, the herringbone grooves 71 as shown in FIG. 2 are formed on the upper and lower surfaces of the disc 7 as well as the upper and lower gaps 72 and 73 of the bearings. Oil (0) is present.

The most distinctive feature of the present invention in such a configuration is that an oil transfer means 8 is formed into the disc 7.

In addition, while forming the oil moving means 8 as described above, it is possible to form a separate oil holding means 9 on the outer circumferential surface of the disc 7.

As shown in FIG. 3 or FIG. 4, the oil moving means 8 includes a through hole 81 that penetrates from the outer circumferential surface of the disc 7 to the inner diameter of the motor shaft 1, and the through hole 81; It consists of a vertical groove 82 formed perpendicular to the inner diameter of the disc while being in contact, the oil moving means 8 can form a plurality of two or more in radial shape.

In addition, the oil movement means 8 is configured as described above, but the annular groove 83 formed along the outer circumferential surface may be formed together at the interruption of the outer circumferential surface.

And the oil holding means 9 is to form a longitudinal tooth groove 91 is repeated in all sections along the outer circumferential surface of the disc 7 as shown in Figure 3, the tooth groove 91 at this time is the disc It is repeatedly formed in all sections along the outer circumferential surface of (7), but may be formed to be inclined at any angle.

The following describes the operating state of the present invention configured as described above.

When the motor is driven and the rotor assembly 3 rotates, dynamic pressure is generated between the motor shaft 1 and the dynamic bearing 4 to reduce the frictional force. In the radial bearing 3a, the motor The shaft 1 is supported in the vertical direction, and in the horizontal bearing 3b, the motor shaft 1 is supported in the up and down directions due to the dynamic pressure generated by the herringbone structure. The movement of the bearing oil (0) occurs as shown in the FIG. 5 figure with dynamic pressure operation.

That is, when the rotor rotates, the oil in the upper and lower gaps 72 and 73 of the disc 7 flows to the outer circumferential side of the disc as shown in FIG. 7 and the oil thus moved ( 0) is bitten by the oil which is continuously pushed to the middle part of the outer peripheral surface of the disc 7.

At this time, the oil is moved back to the center where the motor shaft 1 is located by the oil moving means 8 of the disc 7 to circulate.

More specifically, the oil which is pushed and moved at a break height by a number of longitudinal teeth 91 formed on the outer circumference of the disc 7 flows in through the through hole 81 penetrating the center of the disc 7 transversely. The oil is moved along the vertical grooves 82 of the inner diameter and flows back into the discs 7 and 72 through the capillary phenomenon so as to continue the dynamic pressure action.

As above, the force that allows the oil to flow is due to the flow of oil moving to the outer circumference by centrifugal force and the force of capillary phenomenon that occurs on the opposite side as the oil is thin.

On the other hand, in the oil movement means 8 as described above, since the annular groove 83 as shown in FIG. 8 is formed in the middle of the disc 7, the tooth groove in the longitudinal direction (or inclined direction) is formed. Since oil (0) moved to the stop portion along the 91 is considered to be easy to move toward the hole 81 is to be able to cause a smooth oil movement even if the hole 81 is not too many.

Even if there are oils scattered as fine particles in the movement of the oil as described above, it is possible to circulate again by being mixed by the tooth groove 91, wherein the air included is not guided to the upper and lower gaps of the disc, and the gap between the labyrinth seals Is discharged through.

In the present invention, the oil bearing means 9 can be used to fill the extra bearing oil (0).

That is, as shown in FIG. 9, an extra bearing oil 0 may be supplied in advance to the gear-shaped tooth groove 91 formed along the outer circumferential surface of the disc 7 to extend its life.

As described in detail above, the present invention uses the oil pressure bearing having a herringbone structure, and thus, since the oil moving means 8 is provided, even if there is a movement of the oil due to the high speed rotation, the moved oil is returned to the upper and lower herringbones. Since it can be led to the groove 71, there is an effect that it does not lower the dynamic pressure action of the herringbone structure, thereby improving the merchandise, and since the oil holding means 9 is provided, it is more than required oil supplied in consideration of the life of the bearing Since it has a large amount of oil to be used, as a result has the advantage of extending the life.

Claims (10)

A spindle motor comprising a stator assembly (2), a motor shaft (1) installed in the center of the setter assembly, and a rotor assembly (3) condensed on an upper end of the motor shaft. The disc 7 is installed between the rotor and the motor shaft, but is fixed on the upper end of the motor shaft 1 with a herringbone groove 71 on the top and bottom, the disc saddle expansion portion 41 and the disc A herringbone structure dynamic pressure bearing (4) having an intermittent leverlining seal (5) on the upper shaft is provided, With oil moving means 8 for moving bearing oil 0 from the outer circumferential surface of the disc 7 to the surface of the motor shaft 1 A spindle motor having a herringbone type dynamic bearing characterized in that the herringbone structure allows circulation of bearing oil. A spindle motor comprising a stator assembly (2), a motor shaft (1) placed in the center of the stator assembly, and a rotor assembly (3) condensed on an upper end of the motor shaft. The disc 7 is installed between the rotor and the motor shaft, but is fixed on the upper end of the motor shaft 1 with a herringbone groove 71 on the top and bottom, the disc saddle expansion portion 41 and the disc A herringbone type having an intermittent leverlining seal 5 on the upper side provides a hydrostatic bearing 4, Oil moving means 8 for moving the bearing oil 0 from the outer circumferential surface of the disc 7 to the surface of the motor shaft 1 and bearing oil 0 remain on the outer circumferential surface of the disc 7. With oil holding means (9) to enable Spindle motor having a herringbone type of dynamic pressure bearing, characterized in that the bearing herringbone structure and the bearing oil can be circulated in the herringbone structure. The method of claim 1, The oil moving means 8 includes a through hole 81 penetrating from an outer circumferential surface of the disc 7 to an inner diameter fitted with a motor shaft, and a vertical groove 82 formed perpendicular to the inner diameter of the disc while contacting the through hole 81. Spindle motor having a herringbone type hydrodynamic bearing, characterized in that consisting of. The method of claim 3, Two or more through-holes 81 of the oil movement means 8 are formed in a plurality, each of which has a radial shape facing the motor shaft, and also two or more vertical grooves 82 in contact with the respective through-holes 81. Spindle motor having a hydrodynamic bearing of the herringbone type, characterized in that formed in plurality. The method of claim 1, The oil moving means 8 includes a through hole 81 penetrated from the outer circumferential surface of the disc 7 to an inner diameter fitted with a motor shaft, a vertical groove 82 formed perpendicular to the inner diameter so as to be connected to the through hole 81; Spindle motor having a herringbone type dynamic pressure bearing, characterized in that consisting of a ring-shaped groove (83) formed along the circumference at the interruption of the outer peripheral surface of the disc (7). The method of claim 2, The oil moving means 8 includes a through hole 81 penetrating from an outer circumferential surface of the disc 7 to an inner diameter fitted with a motor shaft, and a vertical groove 82 formed perpendicular to the inner diameter of the disc while contacting the through hole 81. Spindle motor having a herringbone type hydrodynamic bearing, characterized in that consisting of. The method of claim 6, Two or more through-holes 81 of the oil movement means 8 are formed in a plurality, each of which has a radial shape facing the motor shaft, and also two or more vertical grooves 82 in contact with the respective through-holes 81. Spindle motor having a hydrodynamic bearing of the herringbone type, characterized in that formed in plurality. The method of claim 2, The oil moving means 8 includes a through hole 81 penetrated from the outer circumferential surface of the disc 7 to an inner diameter fitted with a motor shaft, a vertical groove 82 formed perpendicular to the inner diameter so as to be connected to the through hole 81; Spindle motor having a herringbone type dynamic pressure bearing, characterized in that consisting of a ring-shaped groove (83) formed along the circumference at the interruption of the outer peripheral surface of the disc (7). The method of claim 2, The oil moving means (9) is a spindle motor having a herringbone type dynamic bearing, characterized in that to form a longitudinal tooth groove 91 is repeated in all sections along the outer peripheral surface of the disc (7). The method of claim 9, The tooth groove 91 of the oil holding means 9 is repeatedly formed in the entire section along the outer circumferential surface of the disc 7, but the spindle motor having a herringbone type dynamic pressure bearing, characterized in that it is formed to be inclined at an arbitrary angle. .