JP2001333912A - Dental handpiece provided with micro engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handpiece equipped with a compact engine that can be housed in a head case and effectively cooled. SOLUTION: When a cover component 13 is screwed in a head case 10 which houses a stator 11 and a rotor 12, the stator 11 can be fixed in the head case 10 and the rotor 12 can be rotatably supported. A cooled air supply route 16 is formed in the head case 10, whereas a freely installable and removable cover component 14 is fixed in the lower section of the above head case 10 for releasing the water or air or spray toward the tip of a cutting tool, to which the air is supplied through the cooled air supply route 16 that supplies the air to the head case 10 or the air supply route 17b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental micro-engine handpiece, and more particularly to an improvement of a micro-engine handpiece used for cutting teeth in dental treatment, and more particularly, to a micromotor in a head case. The present invention relates to a micro engine handpiece that can be incorporated and that can effectively cool the motor.

[0002]

2. Description of the Related Art In dental treatment, for cutting teeth,
An air turbine or a micro engine is used. As is well known, an air turbine is provided with a rotating shaft having turbine blades in a head case, blows air to the turbine blades to rotate the rotating shaft at high speed, and is detachably mounted on the rotating shaft. The cutting tool is used to cut teeth. On the other hand, the micro engine has a micro motor in a power part case, transmits the rotation of the motor to a rotating shaft provided in a head case via a spindle or the like, and is detachably attached to the rotating shaft. The cutting tool is used to cut teeth.

[0003] However, the air turbine is noisy because wind noise of turbine blades, noise when air leaks to the outside, etc. are generated, and at the time of tooth cutting, cutting powder and the like are scattered by the leaked air. When stopped, the turbine blades idle and the inside of the head case becomes negative pressure, dust and the like are sucked into the head case, which is unsanitary.In addition, air flushing is required to blow out the sucked dust and the like. There were various problems that had to be solved, such as having to do so. Also, the micro engine transmits the rotation of the motor in the gripping case to the rotating shaft in the head case,
It requires a power transmission mechanism such as a spindle, and further requires a speed increasing mechanism to increase the number of rotations of the rotating shaft.
There was a problem that the cost would be high.

[0004]

In order to solve the above-mentioned problems, the present applicant first accommodates a micromotor in a head case of a handpiece, and attaches a cutting tool to a rotating shaft of the micromotor. We have proposed a dental micro engine handpiece that can be detachably mounted.However, when the micromotor is rotated at high speed, the micromotor is overheated, and it is overheated so that the conventional air cooling can not hold the handpiece. Therefore, the present invention is further improved to make it possible to cool the micromotor more effectively.

[0005]

According to a first aspect of the present invention, there is provided a head case having an air supply passage for supplying cooling air into the head case, and is provided so as to be insertable into and removable from the head case. A rotor having a chuck mechanism for fixing a cutting tool therein, a stator having a drive coil removably inserted into and detachable from the head case and facing a rotating peripheral surface of the rotor; and the stator and the rotor. And a lid member for fixing the stator in the head case and rotatably supporting the rotor, detachably attached to a lower portion of the head case, and facing the tip of the cutting tool. And a head cooling member for discharging a spray which is water or air or a mixture of water and air.

According to a second aspect of the present invention, in the first aspect of the present invention, a water circuit and an air circuit for supplying to the head cooling member are separately provided.

According to a third aspect of the present invention, in the first aspect of the present invention, the air supplied to the head cooling member is air supplied into the head case.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the air supplied into the head case is discharged to the outside of the head case.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a light source and an optical fiber for transmitting light from the light source are provided, and the light from the light source is radiated from the tip of the optical fiber. In this way, the tip of the cutting tool is illuminated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded sectional view of an essential part for explaining an embodiment of a micro engine handpiece according to the present invention. FIG. 2 is a sectional view after assembling. A head case 11 of the engine handpiece is a stator yoke which is removably housed in the head case 10 (in practice, a stator coil is wound around the stator yoke 11 to form a stator, as is well known). A rotating (or alternating) magnetic field is generated by a current supplied to the stator coil. Hereinafter, 11 will be referred to as a stator), and 12 will be inserted into and removed from the stator 11, A rotor 13 rotated by a rotating (or alternating) magnetic field generated by the stator 11 is a lid member screwed into the head case 10, and a stator 13 is provided in the head case 10. 1, after storing the rotor 12, the screw 10 of the head case 10 and screw 13a of the lid member 13
a, the outer race of the lower bearing 12b of the rotor 12 is fixed to the O-ring 10b in the head case 10.
The outer race of the upper bearing 12a is supported and fixed by the O-ring 13b of the lid member 13, and the rotating shaft 12c fixed to the inner race of the bearings 12a and 12b is rotatably supported.

As is well known, the rotating shaft 12c has a magnet 1
2d is integrally attached, and when a rotating (or alternating) magnetic field is generated by the stator 11, the rotating member is rotated according to the rotating (or alternating) magnetic field. Also, the rotating shaft 1
A chuck piece 12e is screwed into 2c, a jig is inserted through a hole 13c provided in the lid member 13, and the chuck piece 12e is opened by rotating the chuck piece 12e with the jig. In that state, the cutting tool 20 is
When the chuck piece 12e is inserted into the chuck piece 12e through 2c and the chuck piece 12e is rotated in the opposite direction to that described above,
The chuck piece 12e is closed, and the cutting tool 20 can be fixed.

A water circuit 14 is provided below the head case 10.
The cover member 14 having a is fixed by a screw member 15 having a screw 15a which is screwed with a screw 10c provided at a lower portion of the head case 10.

As described above, the micromotor composed of the stator 11 and the rotor 12 is housed in the head case 10, and the cutting tool 20 is provided below the head case.
A cover member 14 having an ejection hole for ejecting a spray of water or air or a mixture of water and air for cooling a cutting portion formed by the above is fixed, thereby forming a head with a built-in micromotor.

Reference numeral 16 denotes an air circuit for cooling the head case 10, and air supplied into the head case 10 from 16a is circulated in the head case 10 and discharged to the outside. 17a is the water circuit 1 of the cover member 14.
A water circuit for supplying water to 4a, 17b is
In the air circuit for supplying air to the air circuit 14b, water, air or spray is injected from the injection holes of the cover member 14 to cool the cut portion. Reference numeral 18 denotes a light source for illuminating a cutting portion. The light source is usually formed of an optical fiber or the like, and light introduced from an end (not shown) is transmitted through the optical fiber, and the end (light source) 18 to radiate. Note that, in FIG.
Although the example in which the air supplied to the head case is supplied through the air supply path 17b has been described, the air that has cooled the inside of the head case may be used.

[0015]

As is apparent from the above description, according to the present invention, in a small-sized micro engine handpiece in which a micromotor is incorporated in a head case,
The micromotor can be cooled more effectively.

[Brief description of the drawings]

FIG. 1 is an exploded cross-sectional view of a main part for describing an embodiment of a micro engine handpiece according to the present invention.

FIG. 2 is a cross-sectional view after assembling the micro-engine handpiece according to the present invention. FIG.
FIG. 2B is a sectional view taken along line BB of FIG.

[Explanation of symbols]

10 ... head case, 11 ... stator, 12 ... rotor,
13 lid, 14 cover, 15 cover stop, 16 air circuit, 17a water circuit, 17b air circuit, 18 light source, 20 cutting tool.

Claims (5)

[Claims] 1. A head case having an air supply path for supplying cooling air into a head case, and a chuck mechanism which is rotatably inserted into and removable from the head case and has a chucking mechanism for fixing a cutting tool therein. A rotor having a driving coil removably inserted into and detachable from the head case and opposed to a rotating peripheral surface of the rotor; and a stator accommodating the stator and the rotor in the head case. A lid member for fixing the inside of the head case and rotatably supporting the rotor, and water or air or a mixture of water and air which is detachably attached to a lower portion of the head case and is directed toward the cutting tool tip. A dental microengine handpiece having a head cooling member for emitting a spray that is: 2. The dental micro-engine handpiece according to claim 1, wherein a water circuit and an air circuit for supplying to the head cooling member are separately provided. 3. The dental micro-engine handpiece according to claim 1, wherein the air supplied to the head cooling member is air supplied into the head case. 4. The dental microengine handpiece according to claim 1, wherein the air supplied into the head case is discharged out of the head case. 5. A light source, and an optical fiber for transmitting light from the light source, wherein the light from the light source is emitted from the tip of the optical fiber to illuminate the cutting tool tip. The dental micro-engine handpiece according to claim 1, wherein