JPH035402Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a cooling device for cooling lubricating oil to a transmission mechanism that interlocks a spindle on which a tool is mounted and a spindle motor in a machine tool. It is something.

(2) Prior Art A cooling device is known in which a cooling circuit is connected to the lubrication system of a conventional machine tool to forcibly cool the lubricating oil of the machine tool (see Japanese Utility Model Application No. 134552/1983).

(3) Problems to be solved by the invention However, the conventional lubricating oil cooling system for machine tools has a refrigeration system interposed in its cooling circuit, which not only increases manufacturing costs but also reduces the overall structure. There is a problem that it becomes complicated and maintenance becomes troublesome.

Therefore, the present invention uses a heat exhaust fan for cooling the spindle drive motor to effectively cool the radiator in the cooling circuit, and in particular effectively cools the lubricating oil of the transmission mechanism that links the spindle to which the tool is attached and the spindle motor. The object of the present invention is to provide a cooling device for lubricating oil in a machine tool that can cool the lubricating oil.

B. Structure of the invention (1) Means for solving the problem According to the invention, in order to achieve the above-mentioned purpose, a transmission mechanism is provided in which the driving shaft of a spindle motor and a spindle with a tool attached to the tip are provided in a transmission box. In the machine mechanism which is interlocked and connected through the transmission box, a cooling circuit is connected to the transmission box for forced circulation of the lubricating oil inside the transmission box, and this cooling circuit includes:
A radiator is provided to cool the lubricating oil flowing through the circuit, and a cooling exhaust fan for the spindle motor is disposed on one side of the radiator with a gap between the radiator and the cooling exhaust fan for cooling the spindle motor. The area of the part of the fan facing the blow-off port is made smaller than the blow-out area of the blow-off port.

(2) Effect The spindle to which the tool is attached is driven to rotate through the transmission mechanism by the drive of the spindle motor, and the lubricating oil in the transmission chamber is circulated through the cooling circuit and cooled by the drive of the hydraulic pump. The radiator inside is effectively cooled by air from the spindle motor's heat exhaust fan.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, a column 2 is erected on a bed 1 of a machine tool, a frame 3 is supported on this column 2, and this frame 3 is connected to a pair of rails 4 by driving a feed motor (not shown). , 5. A turret 6 is supported on the frame 3, a plurality of spindle heads 7 are integrally provided on the turret 6, a spindle 8 is rotatably supported on each spindle head, and the turret 6 is a pivot center. By turning around line a, the spindle 8 and the spindle head 7 can take a processing position A shown in phantom lines in FIG. 1 and a standby position B shown in phantom lines in FIG. 1. Further, the turret 6 is fixed to the frame body 3 by tightening the clamp member 9.

A tool 10 such as a drill is detachably attached to the tip of the spindle head 7. The rear end of the spindle 8 is connected to the drive shaft 1 via a clutch mechanism 11.
2, and the clutch mechanism 11 is connected to
It is connected to a clutch actuating device 13 supported by the frame body 3, and the actuation of the clutch actuating device 13 engages and disengages the clutch mechanism 11 to connect the drive shaft 12 to the spindle 8 or to break the connection. It is becoming possible to do this. Since the clutch mechanism 11 and the clutch actuating mechanism 13 are not related to the gist of the invention of this application, a detailed explanation thereof will be omitted.

A drive shaft 12 connected to the spindle 8 via a clutch mechanism 11 is rotationally driven by a spindle motor 14 supported on the column 2. Next, to explain this drive system, as clearly shown in FIG. 2, a transmission box 15 is integrally provided at the rear of the frame 3, and a spindle motor 14 and a drive shaft 12 are interlocked and connected within the box 15. A transmission mechanism T is installed inside. That is, the tip of the driving shaft 16 of the spindle motor 14 is inserted into the transmission box 15 and the input gear 17 is fixed there, and the rear end of the drive shaft 12 is also inserted into the transmission box 15 and fixed there. An output gear 18 is fixed to the input gear 17 , and the input gear 17 and the output gear 18 are interlocked via an idle gear 19 .

The motor 14 has a heat exhaust fan 20 at its rear.
The spindle motor 14 itself is cooled by the rotation of the heat exhaust fan 20, and a blower outlet 21 is opened on the back surface of the spindle motor 14.

The transmission box 15 stores the lubricating oil, and is connected to a cooling circuit for cooling the lubricating oil.

Next, to explain this cooling circuit, in FIG. 2, a motor 23 is mounted on the oil tank 22.
A suction pipe 25 connected to the suction side of the oil pump 24 extends downward within the oil tank 22, and an oil strainer 26 is connected to the lower end of the suction pipe 25. One end of a discharge pipe 27 is connected to the discharge side of the oil pump 24, and the other end of the pipe 27 is connected to the inlet 2 of the radiator 28.
Connected to 9. At the outlet 30 of the radiator 28,
One end of the inflow pipe 31 is connected, and the other end of the pipe 31 is connected to an inflow port 32 opened at the top of the transmission box 15. Further, an oil injection nozzle 36 that projects into the upper part of the transmission box 15 is connected to the inlet 32, and this oil injection nozzle 36 opens downward toward the transmission mechanism T inside the transmission box 15.

An outflow port 33 is opened at the bottom of the transmission box 15, and an outflow hose 3 is connected to this outflow port 33.
The other end of 4 is connected to the oil tank 22.

The radiator 28 is disposed substantially parallel to and facing the back surface of the spindle motor 14 with a gap (approximately 5 cm) therebetween. Also the third
As shown in the figure, the radiator 28 is formed into a rectangular shape that is long in the vertical direction, its width is shorter than the diameter of the air outlet 21 (FIG. 3) of the spindle motor 14, and its length in the vertical direction is It is longer than the diameter of the air outlet 21 of the spindle motor 14.

Next, the operation of this embodiment will be explained.

When the spindle motor 14 is driven by the operation of the machine tool, the drive shaft 12 is driven via the transmission mechanism T, and the rotation of the drive shaft 12 is transmitted to the spindle 8 via the clutch mechanism 11 to rotationally drive the tool 10. do. Furthermore, as the motor 23 is driven, the lubricating oil in the transmission box 15 is sucked into the oil tank 22 through the outflow hose 34, and the lubricating oil in the tank 22 is sucked up and pressurized by the oil pump 24. Discharge pipe 27, radiator 2
8. After being cooled through the inflow pipe 31, the oil is sent under pressure to the oil injection nozzle 36 in the transmission box 15, and the oil from the oil injection nozzle 36 is injected toward the transmission mechanism T to lubricate them. .

By the way, the pressurized air from the exhaust heat fan 20 rotated by the spindle motor 14 flows toward the radiator 28 from its outlet 21, and the radiator 28 can be air-cooled. At that time, a predetermined gap C is provided between the air outlet 21 and the radiator 28, and the exhaust heat fan 2 of the radiator 28 is
Since the area of the part facing the air outlet 21 of the heat exhaust fan 20 is made smaller than the area of that air outlet 21, a part of the pressure air from the heat exhaust fan 20 passes through the outside of the radiator 28 at high speed and is Negative pressure is generated around the radiator 28, and this negative pressure allows relatively low-temperature air to be sucked in and guided to the radiator 28, thereby enhancing the heat dissipation effect of the radiator 28.

C. Effect of the invention As is clear from the above embodiments, according to the invention, a cooling circuit for forced circulation of the lubricating oil inside the transmission box is connected to the transmission box, and the cooling circuit is connected to the transmission box. A radiator is provided to cool the flowing lubricating oil, and a cooling exhaust fan for the spindle motor is provided on one side of the radiator with a gap therebetween. Since the area of the part facing the outlet is made smaller than the blowout area of the outlet, the radiator in the cooling circuit can be air-cooled using the heat exhaust fan of the spindle motor. The synergy between the high-speed pressure air that hits the radiator and the relatively low-temperature atmospheric air that is sucked in from around the radiator and hits the radiator allows the lubricating oil to be effectively air-cooled, eliminating the need for expensive refrigeration equipment. The desired cooling effect can be achieved even without it.

[Brief explanation of the drawing]

The drawings show an embodiment of the device according to the present invention, in which Fig. 1 is a cross-sectional plan view of the main part thereof, Fig. 2 is a longitudinal cross-sectional side view of the main part, and Fig. 3 is a partial view taken along the line of Fig. 2. be. C... Gap, T... Transmission mechanism, 8... Spindle, 10... Tool, 14... Spindle motor,
15...Transmission box, 16...Driving shaft, 20...
...exhaust heat fan, 21...inlet, 28...radiator.

Claims (1)

[Scope of utility model registration request] In a machining mechanism in which a driving shaft 16 of a spindle motor 14 and a spindle 8 having a tool 10 attached to its tip are interlocked and connected via a transmission mechanism T provided in a transmission box 15, the transmission box 1
5 is connected to a cooling circuit for forced circulation of the lubricating oil therein, a radiator 28 is interposed in this cooling circuit for cooling the lubricating oil flowing through the circuit, and one side of the radiator 28 is connected to the cooling circuit. A gap C exists between the spindle motor 14 and the cooling exhaust heat fan 2.
The area of the portion of the radiator 28 facing the air outlet 21 of the cooling exhaust heat fan 20 is
A lubricating oil cooling device for a machine tool, characterized in that the blowout area is smaller than the blowout area of the blowout port 21.