JPH0719311A - Motive power transmission mechanism - Google Patents

Abstract

PURPOSE:To smooth rotation of shaft and to reduce vibration and vibration noise by installing a balance weight to offset an eccentric load on the shaft the head end part of which eccentrically rotates. CONSTITUTION:This mechanism has an eccentric shaft 1c eccentrically provided on an head end part of a shaft 1, a bearing 2 integrally provided on the eccentric shaft 1c, a pin shaft vertically arranged against the shaft 1 free to revolve on the extension of the shaft 1 and an oscillating member arranged integrally on the pin shaft and having a recessed part 5a on the head end of which an outer race of the aforementioned bearing 2 is loosely fit, and it converts rotation of the shaft 1 to turning movement of a turning movement shaft 6. An object 15 is a balance weight provided on the shaft 1, and it smooths rotation of the shaft 1. It consists of the balance of the balance weight installed integrally on the shaft and to balance an eccentric load of the shaft 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power transmission mechanism, more specifically,
The present invention relates to improvement of a mechanism for converting rotation of a rotary shaft into reciprocating rotary motion in a direction perpendicular to the rotary shaft in a plane parallel to the rotary shaft.

[0002]

2. Description of the Related Art In dental treatment, a tooth is cut by a high speed rotation using a micro engine.
However, recently, medical technology has been subdivided and specialized, and for example, a hand-only specialist or a foot-only specialist has appeared. Thus, in the treatment of only these hands and feet, it is necessary to perform treatments such as cutting and cutting of bones, but conventionally, there is no cutting tool suitable for treating the bones of these hands and feet, which is very inconvenient. I was feeling.

In view of the above-mentioned circumstances, the present applicant has previously proposed a cutting tool suitable for cutting or cutting the fine bones of the hand or foot. Is not limited to fine bone cutting and cutting, but more broadly,
Needless to say, it can be used for cutting bones of other people or animals, or for cutting materials other than bones, such as wood.

2 and 3 are sectional views for explaining an example of the power transmission mechanism previously proposed by the present applicant. FIG. 2 is a sectional view taken along line II-II of FIG. 3, and FIG. 3 is a sectional view taken along line III-III of FIG. 1, in which 1 is a rotary shaft, and the rotary shaft 1 is, for example, a rotary shaft connected to a rotary shaft rotated by a micro engine known in dental treatment. The rotary shaft 1 is preferably used by being connected to a power unit of a motor handpiece currently commercially available as a dental treatment tool.

An eccentric recess 1b is provided in the tip 1a of the rotary shaft 1, and a one-side seal bearing 2 is swingably engaged in the recess 1b. That is, the outer race 2 of the bearing 2 is swingably mounted in the recess 1b, and the inner ring 2b has the connecting ring 3
Is fixed. Therefore, when the rotary shaft 1 rotates, the concave portion 1b rotates eccentrically, and the connecting ring 3 makes a sleek movement with the inner race 2b as one end point.

The other end of the connecting ring 3 is connected to a rotary plate 5 by a pin 4, and the rotary plate 5 is attached to the rotary shaft 6 so as to rotate integrally with the rotary shaft 6. There is. 7
Is a holding plate connected to the tip of the link 3 so as to swing integrally with the link 3, 8 is a fixing nut member, 9 is a saw plate, and has saw teeth 9a at its tip. A driver groove 6a for rotating the rotating shaft 6 is provided at the head of the rotating shaft 6, and a screw 6b for screwing the rotating shaft 6 into a fixing nut member 8 is provided at the lower portion. In addition, a protrusion 8a is provided on the upper portion of the fixing nut member 8, and the protrusion 8a engages with a groove provided on the lower portion of the rotating plate 5, whereby the fixing nut member 8 rotates. It is not possible.

Therefore, when, for example, a coin is inserted into the groove 6a and the rotating shaft 6 is rotated in one direction, the shaft 6 and the fixing nut member 8 move upward, and the rotating plate 5 and the pressing plate 7 Since the space between them is tightened, if the saw plate 9 is inserted between them, the saw plate 9 can be fixed between the rotating plate 5 and the holding plate 7. Next, when the rotary shaft 6 is rotated in the opposite direction to the above, the gap between the rotary plate 5 and the pressing plate 7 is widened, and the saw plate 9 can be removed.

The rotary shaft 1, the pin shaft 5, and the rotary shaft 6 are orthogonal to each other, and the swing plate 5 is moved by the rotary shaft 6 in the vertical direction (direction A in FIG. 2). ) Is blocked, but this is because the oscillating plate 5 and the connecting link 3 are pivotally connected by the pin shaft 4, so that this direction (A direction) due to the eccentric movement of the connecting link 3 is prevented. ) Can be absorbed.

On the other hand, the movement in the direction perpendicular to the paper surface, that is,
The movement in the B direction in FIG. 3 cannot be absorbed by the pin shaft 4, and is transmitted to the rotating plate 5 as it is. However, this rotating plate 5 is formed by the ball bearings 11 and 12.
The support portion 10 rotates integrally with the rotating shaft 6, and the saw plate 9 rotates around the rotating shaft 6.

As described above, according to the power transmission mechanism described above, the rotation of the rotary shaft can be reciprocally rotated in the direction perpendicular to the rotary shaft in the plane parallel to the rotary shaft, and therefore the sawtooth at the tip. When the saw plate having the above is attached, the bone or the like can be cut or cut by holding the pencil in the hand and moving it so as to draw a vertical line.

[0011]

According to the power transmission mechanism described above, since the tip of the rotary shaft 1 is eccentrically rotated, an eccentric load is applied to the rotary shaft 1, which causes uneven rotation. However, there are problems that the rocking is violent and that a rocking noise is generated.

[0012]

In order to solve the above-mentioned problems, the present invention (1) reciprocally rotates the rotation shaft in a direction perpendicular to the rotation shaft on a plane parallel to the rotation shaft. A power transmission mechanism for converting into motion, wherein the power transmission mechanism includes a concave portion eccentrically provided at a tip end portion of the rotary shaft, and an outer race swingably arranged in the concave portion. A bearing, a link that is connected to the inner race of the bearing and extends, a rotating plate that is pin-coupled at the tip of the link, and a rotating plate that rotates the rotating plate and an axis orthogonal to the pin axis. And a balance weight that is integrally attached to the rotating shaft to balance the eccentric load of the rotating shaft, or (2) the rotation of the rotating shaft On the plane parallel to A power transmission mechanism for converting into a motion of reciprocating rotation in a direction perpendicular to the axis, the power transmission mechanism comprising an eccentric shaft eccentrically provided at the tip of the rotary shaft, and an eccentric shaft. A bearing that is integrally provided, a rotatable pin shaft that is disposed on the extension of the rotation perpendicularly to the rotation shaft, and that is integrally disposed on the pin shaft, and the bearing is provided at the tip. Of the outer race, the swing member having a concave portion into which the outer race is loosely fitted, and a balance weight integrally attached to the rotary shaft for balancing the eccentric load of the rotary shaft. .

[0013]

The balance weight for canceling the eccentric load is attached to the rotary shaft whose tip is eccentrically rotated to smoothen the rotation of the rotary shaft and reduce vibration and vibration noise.

[0014]

1 is a sectional view of an essential part for explaining an embodiment of the present invention. In the figure, parts having the same functions as those of the prior art shown in FIGS. 3 and the same numbers as in FIG. Thus, in the embodiment shown in FIG. 1, the bearing 2 is attached to the eccentric rotary shaft 1c at the tip of the rotary shaft 1, while the bearing is attached to the end of the rotary plate 5. A recess 5a into which 2 is loosely inserted is provided.

The recess is opened in the vertical direction,
Therefore, when the eccentric shaft 1c is eccentrically rotated, the rotary plate 5 rotates about the rotary shaft 6 in a direction perpendicular to the plane of the drawing, but in the vertical direction, the bearing 2 has the concave portion. The rotating plate 5 does not move in the vertical direction because it can freely move through the opening.

As described above, the rotation of the rotary shaft 1 can be converted into the rotary motion of the rotary shaft 6 also by the power transmission mechanism shown in FIG. 1, and the prior art shown in FIGS. Similarly, the saw teeth 9 fixed to the rotating shaft 6 can be reciprocally rotated in a direction orthogonal to the rotating shaft 1.

In FIG. 1, reference numeral 15 is a balance weight attached to the rotary shaft 1.
This makes the rotation of the rotary shaft 1 smooth, reduces vibration, and reduces vibration noise.

As described above, the tip portion of the rotary shaft 1 is eccentrically moved, and thus the eccentric load is applied to the rotary shaft 1. Therefore, the rotation of the rotary shaft 1 becomes uneven and the vibration is large.
In some cases, a loud vibration sound is generated. Thus, the balance weight 15 eliminates the eccentric load applied to the rotary shaft 1 and thus smoothes the rotation of the rotary shaft 1. The balance weight 15 has the rotary shaft 1 shown in FIGS. 2 and 3. Can be added in the same manner to smooth the rotation of the rotary shaft 1.

In FIGS. 2 and 3, reference numeral 15 shows a state in which the balance weight according to the present invention is attached, which makes it possible to improve the power transmission mechanism according to the prior art described above to a more practical one. Became.

[0020]

As is apparent from the above description, according to the present invention, in a power transmission mechanism that utilizes eccentric rotation to convert rotary motion into rotary motion, an eccentric load applied to a rotary shaft can be effectively applied. Compensate for smooth rotation,
It is possible to reduce rotational vibration and noise.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a main part (cross-sectional view taken along the line II-II of FIG. 3) for explaining an example in which the power transmission mechanism previously proposed by the applicant and the present invention are applied.

3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2 ... Bearing, 3 ... Connection link, 4 ... Pin, 5 ... Rotating plate, 6 ... Rotating shaft, 7 ... Holding plate, 8 ... Fixing nut member, 9 ... Saw plate, 10 ... Support Member, 11, 12, ...
Bearing, 15 ... Balance weight.

Claims (2)

[Claims] 1. A power transmission mechanism for converting the rotation of a rotary shaft into a motion of reciprocating in a direction perpendicular to the rotary shaft on a plane parallel to the rotary shaft, the power transmission mechanism comprising: A recess provided eccentrically at the tip of the rotary shaft, a bearing in which an outer race is swingably disposed in the recess, a link connected to the inner race of the bearing to extend, and the link. At the tip end of the rotating plate, which is pin-coupled, a supporting mechanism that rotatably supports the rotating plate and an axis orthogonal to the rotating shaft and the pin shaft, and is integrally attached to the rotating shaft. A power transmission mechanism comprising a balance weight for balancing an eccentric load of the rotating shaft. 2. A power transmission mechanism for converting the rotation of a rotary shaft into a reciprocating motion in a direction perpendicular to the rotary shaft on a plane parallel to the rotary shaft, the power transmission mechanism comprising: An eccentric shaft that is eccentrically provided at the tip of the rotary shaft, a bearing that is integrally provided on the eccentric shaft, and a rotation that is disposed perpendicular to the rotary shaft as an extension of the rotation. A free pin shaft, a swing member integrally provided on the pin shaft, and having a recess at the tip end to which the outer race of the bearing is loosely fitted, and the rotary shaft integrally attached to the rotary shaft And a balance weight for balancing the eccentric load of the power transmission mechanism.