WO2017206224A1

WO2017206224A1 - Miniature high-speed bearing specifically for use in dental handpiece

Info

Publication number: WO2017206224A1
Application number: PCT/CN2016/087012
Authority: WO
Inventors: 周展力
Original assignee: 宁波和平鸽口腔医疗器材有限公司
Priority date: 2016-06-03
Filing date: 2016-06-24
Publication date: 2017-12-07
Also published as: CN105840649A

Abstract

Disclosed is a miniature high-speed bearing specifically for use in a dental handpiece, comprising a bearing, wherein a bearing sleeve (1) is provided outside the bearing, the bearing sleeve (1) comprises a choke portion (2) covering an upper end face of the bearing, and a via hole corresponding to a hole on the bearing is provided in a middle part of the choke portion (2); a connecting part (4) closely fitting on a side face of the bearing; and an extension part (3) which is folded outwardly and is used for fixing on a machine head of the dental handpiece. The present invention uses the bearing sleeve (1) to form a flange bearing, and the bearing sleeve (1) is simple in structure and can directly be made by pressing, and has a good fixing effect and operating effect. The bearing sleeve has a good sealing effect, without obvious spillover phenomenon of a greasing substance during use, and the bearing sleeve can mitigate heat expansion and cold contraction of the bearing during the operating process, so that the bearing can operate stably within the dental handpiece, and on the other hand, the wall thickness of the bearing is increased, and the double-layered structure can have silencing and damping effects, thereby significantly improving the usage effect and safety and degree of sanitation of the dental handpiece.

Description

A miniature high speed bearing dedicated to dental handpieces

Technical field

The invention relates to a bearing on a dental handpiece.

Background technique

The small size of the dental handpiece is the most difficult to manufacture in the middle of the bearing. The precision of manufacturing the miniature bearing is high, and the difficulty of the process greatly affects the overall production cost of the dental handpiece. Flange bearings have a good mounting and fixing effect, however, the micro-flange bearing machining process is more complicated than the micro-bearing machining. China's patent library discloses a number of flange bearing processing methods, such as the publication number "101219522", the invention name is "a flange bearing outer circle and end face grinding processing method" mentioned in the "flange bearing outer ring" The process steps such as the step-by-step step-by-step processing method are extremely complicated and complicated. In addition, since the internal air pressure is high when the dental handpiece is in use, the gas will overflow from the bearing, and the lubricating material in the bearing will be removed during the overflow process, and the lubricating material will overflow to the oral cavity during use, causing damage to the human body; On the other hand, the overflow of the lubricating material will cause the bearing to dry dry, and the bearing will be quickly lost, so that the bearing temperature will rise rapidly, which has a great impact on the efficiency of the use of the dental handpiece. At present, there are bearings on the market that have bearing side covers. However, these bearings have excessive clearance. The internal airflow easily flows out of the gap and removes the lubricating material. In addition, the bearing cap has high precision and is inconvenient to install, thus affecting the production rate efficiency.

Summary of the invention

In order to overcome the deficiencies of the prior art described above, the present invention provides a miniature high speed bearing dedicated to dental handpieces.

The technical solution to solve the technical problem of the present invention is: a miniature high-speed bearing dedicated to a dental handpiece, comprising a bearing, the bearing is provided with a bearing sleeve, and the bearing sleeve comprises a wind blocking portion covering the upper end surface of the bearing, a through hole corresponding to the hole in the bearing is disposed in a middle portion of the choke portion;

a joint portion that is tightly fitted to the side of the bearing;

An extension for the outward folding of the handpiece of the dental handpiece. After the bearing sleeve is sleeved, it effectively blocks the internal and external airflow to prevent the lubricant from overflowing. The diameter of the through hole on the bearing sleeve is only smaller than the diameter of the inner ring of the bearing and larger than the diameter of the central shaft.

Further, the bearing comprises a bearing outer ring, a bearing inner ring and a ball, the inner wall of the bearing outer ring is provided with a ball groove, the outer wall of the bearing inner ring is provided with a ball groove, and an annular cage is arranged, the cage is located Between the inner ring of the bearing and the outer ring of the bearing, the upper end surface of the retainer is provided with a groove for accommodating the ball.

Further, the cage is disposed on one side of the bearing, and the other side of the bearing is provided with a silicone grease ring. The silicone grease ring is made of freeze-cured silicone grease, which is melted to form a gel-like lubricant after installation, making installation easier.

Further, the choke portion extends horizontally to the side of the inner ring of the bearing, completely covering the inner ring of the bearing and the outer ring of the bearing The gap. The complete coverage of the gap greatly enhances the insulating sealing effect to prevent the lubricant from overflowing and the small gap ensures the operation of the bearing.

Further, a windshield is further disposed, the windshield is disposed on the other side of the bearing, and the windshield cooperates with the bearing sleeve to form an approximately closed space between the bearing inner ring and the bearing outer ring. The double-sided sealing can effectively improve the direct impact of the internal pressure of the dental handpiece on the bearing, and further prevent the internal lubricating material from overflowing.

Further, the air blocking sheet is a wind blocking bowl that is disposed on the other side of the bearing, and the wind blocking bowl cooperates with the bearing sleeve to wrap the bearing. The bearing is almost completely blocked, greatly reducing the leakage of lubricating grease, improving the service life of the bearing and the rotation efficiency.

Further, an O-ring is further disposed between the connecting portion and the extending portion of the bearing sleeve, and the connecting portion of the bearing sleeve and the arc of the extending portion are in close contact with the O-ring. The sealing is strengthened, so that the interior of the dental handpiece is sealed, the internal airflow is prevented from leaking out, the internal airflow conversion efficiency is improved, and the internal airflow is operated more regularly.

Further, the center of the O-ring is at the same level as the center of the bearing ball. The center of the O-ring is at the same level as the center of the bearing ball, so that the bearing ball movement plane is consistent with the fixed plane, making the bearing more stable during operation.

Further, in order to prevent the bearing from being thermally expanded during long-time high-speed operation, the bearing sleeve is relatively offset, so that the bearing position is offset, and the wind-impeding portion and the connecting portion are connected by a circular arc, and the choke is blocked. There is a gap between the portion and the connecting portion and the bearing; the connecting portion and the extending portion adopt a circular arc transition. The arc is excessively applied to make the contact portion fit perfectly, and a gap is provided at the joint between the choke portion and the connecting portion to provide an expansion space of the bearing to prevent the bearing from being relatively offset.

In the invention, the inner ring of the bearing, the outer ring of the bearing and the ball are assembled, and then the cage is mounted, and then the silicone grease ring is placed, the bearing sleeve is installed, and the O-ring is installed outside the bearing sleeve, and the windshield is selectively installed. Can be installed on the machine head for use.

The invention has the beneficial effects that the bearing sleeve is used to form the flange bearing and the bearing sleeve structure is simple and can be directly made by stamping, the fixing effect and the running effect are excellent, the sealing effect of the bearing sleeve is excellent, and the lubricating substance is not obvious when used. The overflow phenomenon, the bearing sleeve can smoothly alleviate the thermal expansion and contraction of the bearing during operation, so that the bearing runs stably inside the dental handpiece, on the other hand, the bearing wall thickness is increased, and the double-layer structure can play the effect of silencing and damping; The invention greatly improves the use effect and safety and hygiene of the dental handpiece.

DRAWINGS

Figure 1 is a perspective view of the present invention.

Figure 2 is a cross-sectional view of the present invention.

Fig. 3 is a schematic view showing another structure of the wind block of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 and 2: a miniature high-speed bearing dedicated to a dental handpiece, comprising a bearing, the bearing is provided with a bearing sleeve 1 , the bearing sleeve 1 comprising a wind blocking portion 2 covering an upper end surface of the bearing, a through hole corresponding to the hole in the bearing is disposed in a middle portion of the choke portion;

The connecting portion 4 on the side of the bearing and the outwardly folded extension 3 for attachment to the handpiece of the dental handpiece. After the sleeve 1 is sleeved, the internal and external airflows are effectively blocked to prevent the lubricating material from overflowing. The diameter of the through hole 4 in the bearing sleeve 1 may be smaller than the diameter of the inner ring of the bearing and larger than the diameter of the central shaft.

In this embodiment, the bearing includes a bearing outer ring 5, a bearing inner ring 6, and a ball 7. The inner wall of the bearing outer ring 5 is provided with a ball groove, and the outer wall of the bearing inner ring 6 is provided with a ball groove, and further includes a ring shape. The holder 8 is located between the bearing inner ring 5 and the bearing outer ring 6, and the upper end surface of the holder 8 is provided with a groove 9 for accommodating the balls 7.

In this embodiment, the retainer 8 is disposed on one side of the bearing, and the other side of the bearing is provided with a silicone grease ring 10. The silicone grease ring 10 is made of freeze-cured silicone grease, which is melted to form a gel-like lubricating material after installation, which makes the installation more convenient.

In this embodiment, the choke portion 2 extends horizontally to the side of the bearing inner ring 6, completely covering the gap between the bearing inner ring 6 and the bearing outer ring 5. The complete coverage of the gap greatly enhances the insulating sealing effect to prevent the lubricant from overflowing and the small gap ensures the operation of the bearing.

In this embodiment, the air blocking sheet 11 is further included, and the air blocking sheet 11 is disposed on the other side of the bearing, and the air blocking sheet 11 is matched with the bearing sleeve 1 to form a bearing inner ring and the bearing outer ring. Approximately enclosed space. The double-sided sealing can effectively improve the direct impact of the internal pressure of the dental handpiece on the bearing, and further prevent the internal lubricating material from overflowing.

In this embodiment, as shown in FIG. 3, the air blocking sheet 11 is a wind blocking bowl that is disposed on the other side of the bearing, and the wind blocking bowl and the bearing sleeve cooperate to wrap the bearing. The bearing is almost completely blocked, greatly reducing the leakage of lubricating grease, improving the service life of the bearing and the rotation efficiency.

In this embodiment, an O-ring 12 is further included, and the O-ring 12 is located between the connecting portion and the extension of the bearing sleeve, and the arc of the connecting portion and the extending portion of the bearing sleeve and the O-shape The circle fits snugly. The sealing is strengthened, so that the interior of the dental handpiece is sealed, the internal airflow is prevented from leaking out, the internal airflow conversion efficiency is improved, and the internal airflow is operated more regularly.

In this embodiment, the center of the O-ring 12 is located at the same level as the center of the bearing ball 7. The center of the O-ring is at the same level as the center of the bearing ball, so that the bearing ball movement plane is consistent with the fixed plane, making the bearing more stable during operation.

In this embodiment, in order to prevent the bearing from being thermally expanded during long-time high-speed operation, the bearing sleeve is relatively offset, so that the bearing position is offset, and the arc-breaking portion and the connecting portion are connected by a circular arc. Resist the wind department There is a gap between the joint of the joint and the bearing; the joint and the extension adopt a circular arc transition. The arc is excessively applied to make the contact portion fit perfectly, and a gap is provided at the joint between the choke portion and the connecting portion to provide an expansion space of the bearing to prevent the bearing from being relatively offset.

Claims

A miniature high-speed bearing dedicated to a dental handpiece, comprising a bearing, characterized in that: a bearing sleeve is arranged outside the bearing, and the bearing sleeve comprises:

a wind blocking portion covering the upper end surface of the bearing, wherein the middle portion of the wind blocking portion is provided with a through hole corresponding to the hole in the bearing;

a joint portion that is tightly fitted to the side of the bearing;

An extension for the outward folding of the handpiece of the dental handpiece.
The miniature high-speed bearing for a dental handpiece according to claim 1, wherein the bearing comprises an outer ring, an inner ring and a ball, the inner wall of the outer ring of the bearing is provided with a ball groove, and the inner ring of the bearing is provided with a ball. The groove further includes an annular retainer positioned between the bearing inner ring and the bearing outer ring, and the upper end surface of the retainer is provided with a groove for accommodating the ball.
The micro-high speed bearing for a handpiece according to claim 2, wherein the holder is disposed on one side of the bearing, and the other side of the bearing is provided with a silicone grease ring.
The dental high-speed bearing for a dental handpiece according to claim 1, wherein said choke portion extends horizontally to the inner ring of the bearing to completely cover a gap between the inner ring and the outer ring of the bearing.
A micro-high speed bearing dedicated to a dental handpiece according to claim 3, further comprising: a choke piece, said choke cover being disposed on the other side of the bearing, said choke piece being engaged with said bearing sleeve An approximately confined space is formed between the inner ring and the outer ring of the bearing.
The micro-high speed bearing for a dental handpiece according to claim 5, wherein the air blocking piece is a wind blocking bowl that is disposed on the other side of the bearing, and the wind blocking bowl and the bearing sleeve are matched with the bearing. .
A dental high-speed bearing for a dental handpiece according to claim 4, further comprising an O-ring, said O-ring being located between said connecting portion and said extension of said bearing sleeve, said bearing sleeve being connected The arc of the portion and the extension is placed in close contact with the O-ring.
The dental high-speed bearing for a dental handpiece according to claim 7, wherein the center of the O-ring is at the same level as the center of the bearing ball.
The micro high-speed bearing for a dental handpiece according to claim 4, wherein a boundary between the wind blocking portion and the connecting portion is a circular arc transition, and a gap between the blocking portion and the connecting portion and the bearing is gapped. The connecting portion and the extending portion adopt a circular arc transition.