JP3058930B2 - Cooling device for rotating shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a rotating shaft of a motor for rotating a spindle of a machine tool, an engine shaft, etc., which is heated to a high temperature .

[0002]

2. Description of the Related Art Conventional spindle motors for machine tools, etc.
The cooling of the rotary shaft of the motor to become hot, there is a case where the heat pipe is used to cool the heat medium of the heat pipe in this case, a proximal end secured to the outer peripheral surface of the rotary shaft
A plurality of cooling fins are provided at intervals in the direction of the axis of the rotating shaft, and a cooling fluid is applied to the fins in the outer periphery further away from the top of the fins in the radial direction. A cooling device for a rotating shaft having a structure to be supplied from a position is employed.

[0003] That is, as shown in FIG.
A plurality of radiating fins 2 provided on the side of a cooling surface for cooling the heat medium of the heat pipe 10 are provided on an outer peripheral surface of a rotating shaft 1 of a motor having a built-in 0, and further radially outward from a top of the fins 2. The cooling fluid 4 is supplied from the position P as shown by the arrow. In FIG. 3, reference numeral 5 denotes a bearing for supporting the rotating shaft 1.

[0004]

[Problems that the Invention is to Solve the axis of rotation of such a motor is generally to the length of the contact area of the component as a heat source, such as a rotor and bearings with respect to the entire length of the shaft, releasing the heat to the outside short length of the cooling portion for this the cooling surface <br/> product has a narrow. Therefore, the temperature inside the motor rises due to insufficient cooling in the cooling unit, and problems such as seizure of the bearing, burnout of the rotor, and deterioration of dimensional accuracy due to thermal expansion of the rotating shaft occur.

[0005] As the cooling fluid for the conventional radiating fins , a gaseous cooling fluid such as air is usually used.
Is, Therefore remove heat is reduced, further, the supply of cooling fluid, as shown in FIG. 3, to so that is supplied from the position P spaced further radially outward than the top portion of the heat radiating fins 2 <br / Therefore, when the rotating shaft 1 that needs to be cooled by the cooling fluid is rotating, the supplied cooling fluid starts rotating together with the radiating fins 2, so that the cooling fluid is most cooled by centrifugal force.
Does not flow into the root of the radiation fin 2 that requires
Further, there is a problem that an effective area related to cooling of the radiation fins 2 is reduced.

The present invention, the above-mentioned cooling apparatus for a conventional rotary shaft
It is intended to provide a cooling device for a rotary shaft which can solve the described problems.

[0007]

The present invention SUMMARY OF THE INVENTION, in the cooling device of the rotating <br/> rotating shaft you so that providing a heat pipe for cooling the rotation shaft to the rotation in the shaft, the outer peripheral surface of the rotary shaft Proximal end
There are erected spaced axially coupled, and heat radiation fins to cool the heat pipe heat medium of the rotary shaft, adjacent
Between the radiating fins arranged in
With cooling fluid introduced from outside
The cooling liquid is removed from the outside near the base end of the radiation fin.
And a cooling medium supply device provided with a nozzle for jetting toward the peripheral surface .

[0008]

According to the present invention, the nozzle constituting the cooling medium supply device is provided.
Cold on the outer circumferential surface of the rotary shaft of the root portion near the heat radiation fin in Le
Is supplied cooling liquid is injected as却流body, during rotation of the rotary shaft which require cooling of the rotary shaft, which is supplied cooling
Cooling flow body made of liquid also starts to rotate. This time, the supplied cooling flow body, the air or other gas as a cooling medium
The specific gravity is higher than when used, and
As it is injected toward the outer peripheral surface of the rotating shaft at the root of the fin, it flows toward the tip along the cooling surface of the radiating fin due to centrifugal force, and finally discharges from the tip of the radiating fin Is done. This flow eliminates the retention of the cooling flow body on the radiating fin, the heat radiation fins attached to the rotating shaft,
The entire area can be effectively used for heat dissipation,
Furthermore, the use of a cooling liquid as a cooling fluid
Heat capacity and specific gravity,
The movement speed due to the centrifugal force is also increased, the heat transfer is improved, and more heat can be released from the radiation fins than before .

[0009]

FIG. 1 shows an embodiment of the present invention. 1, the heat pipe 10 is incorporated therein, a rotating shaft of a motor which rotates the direction of the arrow in the drawing, the outer peripheral surface of one end side is a cooling portion of the heating medium of the heat pipe 10 of the rotary shaft 1 Is
At a distance from each other in the axial direction of the rotary shaft 1, the heat radiation fins 2 of a plurality of ring-shaped is attached. Between the adjacent heat radiating fins 2, the gas to the root portion of the heat radiating fins 2
Larger heat capacity and higher specific gravity compared to body cooling fluid
Coolant that discharges a cooling fluid that is a liquid cooling medium
A plurality of nozzles 3 forming the body supply device is provided with from the outside direction Ke to the outer peripheral surface of the rotary shaft 10. Reference numeral 5 denotes a bearing that supports the rotating shaft 1.

In this embodiment, the rotating shaft 1 is rotated in the direction of the arrow in FIG. 1 by the rotor and stator of a motor (not shown). At this time, the heat generated in the motor and the like heats the heat medium in the heat pipe. It evaporates and this is the radiation fin 2
Radiating the condensed is cooled by this condensed heat medium is again flushed through the heat pipe ring, by evaporation as described above, and the heat radiation by absorbing heat generated by the motor, the rotary shaft 1 Cooling.

At this time, the rotation of the root of the radiation fin 2
On the outer peripheral surface of the shaft 1, a liquid introduced from outside through the nozzle 3
A cooling fluid in the form of a body is supplied. The cooling fluid, the prior art
The specific gravity and heat capacity are larger than those of the gaseous cooling medium.
With the rotation of the heat radiating fins 2 for duck viscosity is large, as shown in FIG. 1 arrow 4, along the surface of the heat radiating fins 2,
It flows by centrifugal force from the root to the tip, absorbs a large amount of heat from the entire surface of the radiating fin 2, and
Will release from the tip to the outer periphery, heat radiation of the heat radiating fins 2 are effectively carried out, moreover, the heat radiating surface of the heat radiating fins 2
There is no stagnant cooling fluid.

Accordingly, in this embodiment, will be the entire plurality of radiating fins 2 are cooled by the cooling liquid body, release
The amount of heat released from the heat fins 2 increases ,
The rotating shaft 1 to which the base end is fixed can be effectively cooled.

FIG. 2 shows an actual measurement result of the temperature of the bearing portion (point A in FIG. 1) with respect to the internal heat generation amount of the motor in the present embodiment, and shows the bearing portion (FIG. 3) in the conventional rotating shaft cooling device shown in FIG. The results are shown in comparison with the measured results of the temperature at point A) in FIG.

FIG. 2 shows that the present embodiment can lower the temperature of the bearing portion with respect to the same internal heating value of the motor than the conventional device.

[0015] As the cooling liquid of the examples,
It can be used a large liquid body of water or other heat capacity and specific gravity.

[0016]

According to the present invention, as described above, by the entire surface of the heat radiation fins provided in the cooling surface of the heat pipe heat medium of the rotating shaft is cooled by liquid cooling flow body, from the heat radiation fins The amount of heat radiation can be increased,
The rotating shaft can be effectively cooled. Therefore, for example, even if the heat load of the motor is increased more than before, the occurrence of seizure of the bearing can be prevented, and the temperature of the rotating shaft can be reduced to reduce the thermal expansion.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a graph in which the temperature of the bearing according to the embodiment and the temperature of the bearing of the rotary shaft having the conventional cooling device are measured.

FIG. 3 is a configuration diagram of a conventional cooling device for a rotating shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Radiation fin 3 Nozzle 4 Cooling fluid flow 5 Bearing 10 Heat pipe

Continuation of the front page (56) References JP-A-49-100675 (JP, A) JP-A-63-7251 (JP, A) Japanese Utility Model Application No. Sho 61-55466 (JP, U) Japanese Utility Model Application Utility Model No. Sho 61-1345 (JP) , U) Fully open sho 64-12755 (JP, U) Really open sho 59-95774 (JP, U) Really open sho 58-11578 (JP, U) Really open sho 57-34164 (JP, U) Real open sho 62-153036 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23Q 11/12 F16C 13/00 H02K 9/22

Claims (1)

(57) [Claims] 1. A cooling apparatus of the rotary shaft provided with a heat pipe to the rotating <br/> rotating inner shaft to cool the rotation shaft, the rotating shaft
The base end is connected to the outer peripheral surface of the
Provided and erected to cool the heat pipe heat medium of the rotating shaft
Between the radiating fin and the adjacent radiating fin, the tip is inserted from the outer periphery and installed.
The cooling liquid introduced from the vicinity of the base end of the radiation fin
A cooling medium supply device provided with a nozzle for jetting toward the outer peripheral surface .