CN203369974U - Core of high speed dental turbine handpiece - Google Patents

Abstract

The utility model relates to a core of a core of high speed dental turbine handpiece. The core comprises a rotary shaft, a wind wheel and two bearings, wherein the wind wheel is sleeved on the rotary shaft; the bearings are angular contact ball bearings. The angular contact ball bearings are used for replacing deep groove ball bearings, so that a rolling ball is only jacked and pressed on a roller path surface, which is shaped like a small-section circular arc at a section, on an inner ring; therefore, on one hand, mutual friction between the rolling ball and the roller path surface is effectively reduced due to decrease of the contact surface, and stability and reliability are higher; on the other hand, the roller path surface, which is shaped like the small-section circular arc at the section, is provided with a connecting step on the peripheral surface of the inner ring, so that the rolling ball is jacked and pressed on the step, a novel step is formed due to abrasion after usage for a period, and the rolling ball is continuously jacked and pressed on the novel step, and the cycle repeats. Compared with the deep groove ball bearings used in the prior art, the service life of the core is greatly prolonged by the angular contact ball bearings.

Description

The high speed dental turbo mobile phone core

Technical field

This utility model relates to dental handpiece, is specifically related to the high speed dental turbo mobile phone core.

Background technology

The high speed dental turbo mobile phone came out in nineteen fifty-seven, was a kind of high speed rotating with air stream drives cutting medical apparatus and instruments, and rotating speed can not wait by 200,000 rev/mins～600,000 rev/mins, and it is mainly used for cutting the tooth body, prepares tooth cavity, prepares thread form and finishing thread form etc.

The high speed dental turbo mobile phone mainly is comprised of with the head be connected with handle handle, handle inside is provided with water inlet pipe, air inlet pipe and return gas channel, head comprises shell and interior movement thereof, movement comprises rotating shaft, be sleeved on wind wheel and 2 bearings in rotating shaft, described 2 bearings lay respectively at the two ends of wind wheel.In the composition of existing dental handpiece movement, described bearing is deep groove ball bearing, it comprises inner ring, retainer, outer ring and is arranged at the some balls on the retainer circumferencial direction, all there is roller surface on the outer peripheral face of described inner ring and the inner peripheral surface of outer ring, because inner ring and outer ring are the hollow cylinder shape, the inside and outside footpath of whole inner ring is identical, and the inside and outside footpath of whole outer ring is also identical, so ball exists maximum face with the roller surface of inner ring and outer ring and contacts.To realize the function of polishing or boring while working due to dental handpiece again, retainer can radially contact and produce friction with the inside and outside circle of bearing, and can vertically contact and produce friction with ball, retainer is easy wear and rupture after long-term friction, shorten the service life of retainer, once and retainer damages, just need to change whole movement, cause cost up.On the other hand, be to guarantee installation and the use of deep groove ball bearing, can not be excessively dark for the hole of putting ball on retainer, and that hole that can not be excessively dark can bear pressure in the axial direction is limited, while causing dental handpiece to bore tooth cavity, torsion is less.

The utility model content

The technical problems to be solved in the utility model is to provide longer service life, axially can bear the high speed dental turbo mobile phone core of larger pressure.

For solving the problems of the technologies described above, this utility model by the following technical solutions:

The high speed dental turbo mobile phone core, comprise rotating shaft, is sleeved on wind wheel and 2 bearings in rotating shaft, and unlike the prior art: described bearing is angular contact ball bearing.

Angular contact ball bearing described in technique scheme is existing conventional angular contact ball bearing, specifically comprise inner ring, retainer, outer ring and be arranged at the some balls on the retainer circumferencial direction, all there is roller surface on the inner peripheral surface of the outer peripheral face of inner ring and outer ring, the external diameter difference of roller surface both sides on described inner ring, the inner ring external diameter that wherein is positioned at the roller surface top is greater than the inner ring external diameter that is positioned at the roller surface below, now on inner ring, the cross sectional shape of raceway is a bit of circular arc, on the roller surface that such design makes ball only push up to be pressed in the inner ring upper section to be a bit of circular arc, on the one hand, due to reducing thereby effectively minimizing mutual friction between the two of contact surface, stability and reliability are higher, on the other hand, the roller surface that the inner ring upper section is a bit of circular arc forms a step of forming a connecting link on the outer peripheral face of inner ring, the ball top is pressed on this step, can form new step again owing to wearing and tearing after using the regular period, ball continues top and is pressed on new step, so circulation, the deep groove ball bearing used in compared to existing technology, extended service life of movement widely.

The accompanying drawing explanation

The structural representation that Fig. 1 is a kind of embodiment of this utility model;

The cut-away view that Fig. 2 is angular contact ball bearing in Fig. 1 illustrated embodiment.

Number in the figure is:

1 rotating shaft; 2 wind wheels; 3 bearings; The 3-1 inner ring; The 3-2 outer ring; The 3-3 retainer; The 3-4 ball.

The specific embodiment

As shown in Figure 1, high speed dental turbo mobile phone core described in the utility model, comprise rotating shaft 1, is sleeved on wind wheel 2 and 2 bearings 3 in rotating shaft 1, and described 2 bearings 3 lay respectively at the two ends of wind wheel 2, and described bearing 3 is angular contact ball bearing 3.

Described angular contact ball bearing 3 as shown in Figure 2, specifically comprise inner ring 3-1, retainer 3-3, outer ring 3-2 and be arranged at the some ball 3-4 on retainer 3-3 circumferencial direction, all there is roller surface on the inner peripheral surface of the outer peripheral face of inner ring 3-1 and outer ring 3-2, the external diameter difference of the upper roller surface of described inner ring 3-1 both sides, the inner ring 3-1 external diameter that wherein is positioned at the roller surface top is greater than the inner ring 3-1 external diameter that is positioned at the roller surface below.

Claims (1)

1. the high speed dental turbo mobile phone core, comprise rotating shaft (1), is sleeved on wind wheel (2) and 2 bearings (3) in rotating shaft (1), and it is characterized in that: described bearing (3) is angular contact ball bearing (3).

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