Coolant application device

1. A coolant application device, comprising:

a housing having a large diameter bore portion and a small diameter bore portion;

a guide member fitted into the large diameter bore portion;

a nozzle that spouts coolant;

a hollow shaft that has a coolant passage therein and is connected with the nozzle, the hollow shaft being rotatively and fluid-tightly inserted into the housing;

a hybrid stepping motor that has an output shaft and adjusts a rotation angle of the nozzle to direct the coolant to a desired angle;

a plurality of ports that are arranged at a lateral wall of the hollow shaft and communicate with the coolant passage; and

an inlet passage that is arranged in the housing and communicates with the coolant passage through the plurality of ports wherein:

the hollow shaft coaxially engages with an output shaft of the motor in a space of the housing, the motor and the housing being arranged in series along an axial direction of both of the hollow shaft and the output shaft of the motor,

the motor and the housing directly engage each other,

a nozzle chamber is formed in the large diameter bore portion between the small diameter bore portion and the guide member,

the plurality of ports are located in the nozzle chamber, and

the nozzle chamber is configured to be wider than the inlet passage.

2. A coolant application device as recited in claim 1 , wherein the hollow shaft is further provided with a joint configured to transmit rotation from the output shaft of the motor to the hollow shaft.

3. A coolant application device as recited in claim 2 , wherein the joint has a double-face configuration.

4. A coolant application device as recited in claim 1 , wherein the motor and housing are adapted to be installed in a box-shape case main body of a case of the coolant application device, the motor and housing being utilizable while in the case.

5. A coolant application device, comprising:

a housing having a large diameter bore portion and a small diameter bore portion;

a guide member fitted into the large diameter bore portion;

a hybrid stepping motor with a hollow motor shaft made of a single individual piece, the hollow motor shaft being provided with a coolant passage therein and being rotatively and fluid-tightly inserted into the housing;

a nozzle being connected with the hollow motor shaft, a rotation angle of the nozzle being adjustable by the hybrid stepping motor to direct coolant to a desired angle;

a plurality of ports that are arranged at a lateral wall of the hollow motor shaft and communicate with the coolant passage;

an inlet passage that is arranged in the housing so as to communicate with the coolant passage through the plurality of ports;

wherein the hollow motor shaft is configured to allow the coolant to pass through therein,

wherein the motor and the housing directly engage each other,

wherein a nozzle chamber is formed in the large diameter bore portion between the small diameter bore portion and the guide member,

wherein the plurality of ports are located in the nozzle chamber, and

wherein the nozzle chamber is configured to be wider than the inlet passage.

6. A coolant application device as recited in claim 5 , wherein the motor and housing are adapted to be installed in a box-shape case main body of a case of the coolant application device, the motor and housing being utilizable while in the case.