JP3323707B2 - Coupling mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting mechanism for rotating shafts, and more particularly, to a rotating shaft for transmitting the rotation of a motor of a micro engine used in dental treatment or the like to a cutting bar (blade). And a suitable coupling mechanism.

[0002]

2. Description of the Related Art FIG. 2 is an exploded perspective view of an essential part for explaining an example of a dental micro engine as an example to which the present invention is applied. In FIG.
Reference numeral 3 denotes a head unit, 4 denotes a hose in which a power supply line for rotating a motor in the motor unit 1 is mounted, and 5 denotes a cutting bar (blade) detachably attached to the head unit.
The motor unit 1, the shank unit 2, and the head unit 3 are integrally connected, and the rotation of the motor in the motor unit 1 is transmitted to the cutting bar 5 via a rotating shaft provided therein. The cutting bar 5 cuts teeth and the like.

FIG. 3 is a schematic diagram of a main part for explaining an example of a coupling mechanism between the rotation shaft of the motor unit 1 and the rotation shaft of the shank unit 2 shown in FIG. 11 is a rotating shaft rotated by the motor 10 in the motor unit 1;
Reference numeral 12 denotes a cylindrical connecting member attached to the tip of the rotating shaft 11 by a pin 13. The tip of the connecting member 12 is provided with a plurality of projections 14 (or cut grooves) extending in the axial direction. The protrusion 14 is provided with a notch (or protrusion) of a connecting member provided on the rotation shaft of the shank 2 as described later.
Is adapted to be engaged.

As shown in FIG. 3B, a rotating shaft 21 connected to the rotating shaft 11 is provided in the shank portion 2. Connecting member 2 engaging with connecting member 12 provided at the end of
2 are attached by pins 23. The connecting member 22 is provided with a notch 24 (or protrusion) extending in the axial direction, and the notch (or protrusion) is provided on the rotating shaft 11 with a protrusion (or notch) of the connecting member 12. And is adapted to be engaged.

FIG. 3C shows a state in which the motor unit 1 shown in FIG. 3A is connected to the shank unit 2 shown in FIG. 3B. The rotating shafts 11 and 21 are connected to the protrusions 14 (or cut grooves) of the connecting member 12 by the connecting members 2.
The two cut grooves 24 (or protrusions) are inserted and connected, and the rotation of the rotary shaft 11 is transmitted to the rotary shaft 21 by the contact of the protrusions and the cut grooves on the side surfaces in the axial direction.

[0006]

According to the above connecting mechanism, the tip of the cylindrical connecting member 22 extends to the rotating shaft 11, but the tip of the connecting member 12 does not extend to the rotating shaft 21. For this reason, the connecting member 12 is loose and generates vibration or noise during rotation. However, on the other hand, a margin is provided in the connecting portion, and a slight eccentric rotation can be absorbed. FIG. 3D shows the connecting members 12 and 22.
Of the connecting portion is extended to the other rotating shafts 21 and 11 so as to eliminate the play of the connecting portion. In this case, there is no play between the connecting member and the rotating shaft. Therefore, if the rotation centers of the rotating shafts 11 and 21 are slightly shifted, not only vibration and noise are generated but also the load is increased and the motor is damaged.

The present invention has been made in view of the above-mentioned circumstances, and in particular, in the above-described coupling mechanism for a rotating shaft, a moderate degree of freedom (play) is provided between the coupling member and the rotating shaft.
The purpose of the present invention is to provide a coupling mechanism with less vibration and noise even if there is some axis deviation.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a first rotating shaft and a second rotating shaft detachably connected to the first rotating shaft. A first cylindrical connecting member attached to the tip of the first rotating shaft and having a projection (or kerf) extending in the axial direction at the tip, and a tip of the second rotating shaft. And a second cylindrical connecting member having a cutting groove (or projection) complementary to the projection (or cutting groove) of the first connecting member at the distal end thereof. the rotation of the first protrusion of the cylindrical connecting member (or notch) and the kerf of the second cylindrical connecting member (or protrusion) of the first rotary shaft engages complementarily engaging the 2
In connection mechanism for transmitting the rotation axis, said first cylindrical connecting member has a size that its inner diameter is loose fitting in the tip portion of the second rotary shaft, the first rotary shaft The distal end has a diameter that fits loosely with the second cylindrical coupling member,
The first and second rotation axes are respectively connected to the distal end.
The diameter is smaller than the diameter of the tip, and the first
It can swing about a line contact portion between the cylindrical connecting member and the tip of the second rotating shaft and a line contact portion between the second cylindrical connecting member and the tip of the first rotating shaft. in which was characterized by a certain arc.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a main part of an embodiment of a connecting mechanism according to the present invention. FIG. 1A shows a motor section corresponding to FIG. (B) shows FIG.
The shank corresponding to (B), FIG. 1 (C) is FIG. 3 (C)
3 shows a connection state between the motor section and the shank section corresponding to FIG. In FIG. 1, reference numeral 11 (or 21) denotes a first rotating shaft, 21.
(Or 11) is a second rotating shaft detachably connected to the first rotating shaft 11 (or 21).
1 (or 21) is provided with a cylindrical first connecting member 12 having a projection 14 (or a kerf) in the axial direction.
And the second rotation shaft 21 (or 1
The projection 14 of the first connecting member 12 is provided at the tip of 1).
(Or kerf) complementary engaging with kerf (or kerf)
Are fixed by pins 23, and the first connecting member 12 and the second connecting member 22 are connected as shown in FIG. 1 (C). I have.

Thus, in the present invention, the tip portions 11a and 21a of the rotating shafts 11 and 21 are formed to have a diameter substantially equal to the inner diameter of the connecting member, in other words, a diameter such that the connecting member is loosened. Subsequent portions 11b and 21b have smaller diameters. That is, the diameter of the distal end 11 a of the rotating shaft 11 is set to be substantially equal to the inner diameter of the connecting member 22, and the diameter of the distal end 21 a of the rotating shaft 21 is changed to the connecting member 12.
And the connecting members 22 and 12 are in contact with each other on the front end portions 11a and 21a, and each connecting member makes line contact on the circumference of the front end portion of the other rotating shaft. It has become. Therefore, each connecting member 12, 2
2 is capable of slightly swinging (play) around the tip portions 21a and 11a, and even if a slight misalignment occurs, it is effectively absorbed to suppress vibration and noise moderately, and is easy to use. A good connection mechanism can be provided.

[0011]

As is apparent from the above description, according to the present invention, it is possible to provide a rotation transmission mechanism that generates little vibration and noise even if there is a slight misalignment.
When applied to a rotation transmission mechanism in a micromotor handpiece or the like in dental treatment, it is possible to perform an operation without giving uncomfortable vibration or noise to an operator or a patient.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram for explaining an embodiment of a rotation transmitting mechanism according to the present invention.

FIG. 2 is an exploded view of a main part for describing an example of a dental microengine handpiece as an example to which the present invention is applied.

FIG. 3 is a main part configuration diagram for explaining an example of a rotation transmission mechanism of the conventional dental micro-engine handpiece shown in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor part, 2 ... Shank part, 3 ... Head part, 4 ... Hose, 5 ... Cutting bar, 10 ... Motor, 11 ... Rotating shaft, 1
1a: tip portion, 11b: small diameter portion, 12: connecting member, 13
... pins, 14 ... projections, 21 ... rotating shafts, 21a ... tip parts,
21b: small diameter portion, 22: connecting member, 23: pin, 24 ...
Kerf.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 1/02

Claims (1)

(57) [Claims] A first rotating shaft, and a second rotating shaft detachably connected to the first rotating shaft, the first rotating shaft being attached to a distal end of the first rotating shaft, and A first cylindrical connecting member having a projection (or a kerf) extending in the axial direction at a distal end thereof; and a first connecting member attached to the distal end of the second rotating shaft and being provided at the distal end. And a second cylindrical connecting member having a cutting groove (or projection) complementary to the projection (or cutting groove) of the first cylindrical connecting member. And the notches (or protrusions) of the second cylindrical connecting member are complementarily engaged with each other to rotate the first rotation shaft to the second position.
In connection mechanism for transmitting the rotation axis, said first cylindrical connecting member has a size that its inner diameter is loose fitting in the tip portion of the second rotary shaft, the first rotary shaft The tip has a diameter that fits loosely with the second cylindrical coupling member,
The first and second rotation axes are respectively connected to the distal end.
The diameter is smaller than the diameter of the tip, and the first
It can swing about a line contact portion between the cylindrical connecting member and the tip of the second rotating shaft and a line contact portion between the second cylindrical connecting member and the tip of the first rotating shaft as a fulcrum. A coupling mechanism, characterized in that: