Background technique
On the miniature high-speed instrument motor, generally all need to be provided with bearing, transmission in order to rotating shaft power, disjunctor group diametrical connection contact bearing is exactly the transmission part of using morely on the miniature high-speed instrument motor, and the accuracy of the reading that produces is to be associated with the working stability of each relevant transmission part in the miniature high-speed instrumentation process.The structure of existing disjunctor group diametrical connection contact bearing comprises rotating shaft and is installed on two angular contact bearings in the rotating shaft side by side, two bearings are socketed in the rotating shaft respectively, have certain clearance between them, and by locating piece they are axially fixed in the rotating shaft respectively.Wrapping angle positioned opposite in two bearings between steel ball and the Internal and external cycle, in order to make two bearings relative play can not take place in the course of the work, guarantee the stability and the accuracy of transmission of power, between two bearings, be provided with some in the periphery of rotating shaft and have certain thickness spacer block, to limit the axial fortune fortune of bearing.The disjunctor group diametrical connection contact bearing of this structure has certain defective, at first, and troublesome poeration when spacer block is set; Secondly,, make spacer block can separate two bearings just, certain degree of difficulty is still arranged though can make various thickness specification to spacer block.And, make the spacer block of different thick specifications, increased the production difficulty of spacer block on the one hand, the circulation to spacer block on the also inconvenient on the other hand production line manages.Utilize spacer block to remove to separate two bearings, both may make between spacer block and the bearing and leave the gap, may make spacer block limit too tight again bearing.Unstability when both of these case all can cause bearing working, to impacting in working life of bearing, and part is more, and the cumulative error in assembling and the production process is big, thereby causes the reading error that produces on the instrument also bigger.
Summary of the invention
For overcoming the above-mentioned defective that existing disjunctor group diametrical connection contact bearing is had, the technical problem that the utility model need solve is: a kind of novel disjunctor group diametrical connection contact bearing is provided, it is convenient to assembling, good operating stability, can be guaranteed the working life of bearing, and the precision height of product.
Another technical problem that the utility model need solve is: provide a kind of production to assemble disjunctor group diametrical connection contact bearing more easily.
Another technical problem that the utility model need solve is: provide a kind of working stability higher disjunctor group diametrical connection contact bearing.
For solving the problems of the technologies described above, the technical solution of the utility model: a kind of disjunctor group diametrical connection contact bearing, comprise rotating shaft and be located at two angular contact bearings in the rotating shaft side by side, two bearings along rotating shaft axially between have at interval, periphery in rotating shaft is provided with the part that separates that is used to limit the bearing axial float between two bearings, rotating shaft is provided with the locating piece that is used for bearing is carried out axially locating, it is characterized in that, the described part that separates is a spring, and the two end part of spring act on respectively on the inner side surface of two bearing outer rings.Two bearings are limited in the rotating shaft under the qualification of axially locating part.The wrapping angle positioned opposite of the steel ball of described two bearings and bear inner ring grooved railway, spring is used to intercept the play of two bearing generation opposite directions, make the play that keeps two outer ring generation opposite directions in the gap, particularly bearing between two bearings forever, in order to bearing work stability.The initial length of spring should be greater than the axially spaced-apart between two bearings, and spring can provide lasting elastic force for two bearings.
As preferably, described spring is become by the spring steel bar helically coiling, and the truncation surface of spring steel bar is rectangular.The truncation surface of spring steel bar of making spring is rectangular, has improved the antifatigue degree of spring.
As preferably, described spring steel bar along the axial width of rotating shaft greater than it along rotating shaft thickness radially.Like this, further improved the antifatigue degree of spring, guaranteed that the work of bearing has good stable.
As preferably, the external diameter of described spring equals the external diameter of bearing outer ring.Both external diameter unanimities by the envelope of other parts, make the outer ring of two bearings and the radial position between the spring fix, and the two end part of spring very stably roof pressure have guaranteed the stability of bearing working on the inner side surface of two bearing outer rings.
Convenience for the production assembling that further improves this disjunctor group diametrical connection contact bearing, in described two bearings, inner ring on one of them bearing A is formed in the rotating shaft, the raceway groove of this inner ring is formed on the outer circumferential face of rotating shaft, inner ring on another bearing B is socketed in the rotating shaft, and described locating piece is located at the outside of bearing B.The raceway groove of bearing A inner ring is formed directly in the rotating shaft, the outer ring of bearing A directly is socketed in the periphery of rotating shaft, also improved simultaneously the ease of processing of bearing, and, in rotating shaft, also do not needed to be provided for limiting the locating piece of bearing A axial position because bearing A is an angular contact bearing.And amount of parts reduces, and has reduced the cumulative error of product in production and assembly process.
As preferably, described rotating shaft is provided with the platform diametric plane that directly makes progress along it, and interior edge face and this step surface of bearing B inner ring fit.By the dual qualification of locating piece and this diametric plane, make the axial position of bearing B in rotating shaft fix.
As preferably, described locating piece is a nut, and this nut thread is connected in the rotating shaft.By being threaded of nut and rotating shaft, simple in structure, and also can finely tune the axially spaced-apart between two bearings by the rotation of nut.
In order further to improve the working stability of this disjunctor group diametrical connection contact bearing, the end near described nut in the described rotating shaft is provided with opening, and it radially is provided with the locking mouth in the nut upper edge.In the end of rotating shaft a jig can be set, this jig can be connected on described opening and the locking mouth simultaneously, make rotating shaft when rotating, nut can be because of not relatively rotating between action of centrifugal force and the rotating shaft, thereby just guaranteed that also axially spaced-apart can not change between two bearings, the stability when having improved the work of this disjunctor group diametrical connection contact bearing.
Therefore, the beneficial effects of the utility model:
Because the periphery in rotating shaft acts on two springs on the bearing outer ring inner side surface in being provided with two ends between two bearings, when this disjunctor group is assembled bearing, the spring that meets the elastic force requirement directly is socketed in the periphery of rotating shaft, and the two ends roof pressure that makes spring assembles very convenient on the inner side surface of two bearing outer rings.With respect to utilizing spacer block that two bearings are separated, the assembling speed of this disjunctor group diametrical connection contact bearing is fast.Select by length and intensity spring, spring can provide lasting elastic force for the outer ring of two bearings, make the outer ring of bearing can remain on well on separately the inner ring, spring neither can make the outer ring of two bearings that significantly axial float takes place, simultaneously by qualification to spring force, can not make that the outer ring in two bearings is subjected to bigger axial pressure yet, guarantee the stability when this disjunctor group is to bearing working.Because of this disjunctor group to the bearing working good stability, can carry out transmission of power exactly, be beneficial to and reduce the reading error that the miniature high-speed instrument is produced.The inner ring and the rotating shaft of a bearing in two bearings are connected as a single entity, and have made things convenient for the assembling of this disjunctor group diametrical connection contact bearing.Be respectively equipped with locking mouth and opening on the locating piece in the rotating shaft and the end of rotating shaft, by on locking mouth and opening, the jig that is connected both being set, make and have motion conformity preferably between locating piece and the rotating shaft, guaranteed the stability of two bearing axially spaced-aparts, be convenient to guarantee the performance of described spring effect, further improved the working stability of this disjunctor group diametrical connection contact bearing.
Embodiment
See accompanying drawing 1,2,3, the structure of the utility model disjunctor group diametrical connection contact bearing comprises rotating shaft 3, bearing A1 and bearing B2, two bearings are socketed in the rotating shaft 3 side by side, have between them at interval, and rotating shaft 3 is provided with the locating piece that two bearings is carried out axially locating.These two bearings are angular contact bearing, the steel ball 2 in them and the wrapping angle positioned opposite of bear inner ring grooved railway.Be provided with in the periphery of rotating shaft 3 and separate part, this separates part between two bearings, is used for two bearings are separated.
The described part that separates is a spring 5, and spring 5 is formed by the spring steel bar coiling.The truncation surface of this spring steel bar is rectangular, spring steel bar along the axial dimension of spring 5 greater than along spring 5 size radially.The two ends of spring 5 act on respectively on the inner side surface of two bearing outer rings 9, and the external diameter of spring 5 equals the external diameter of bearing outer ring 9.
Bearing comprise outer ring 9, inner ring and be located between the inside and outside circle if steel ball 2, steel ball 2 is limited between the raceway groove on the inside and outside circle by retainer 4 with being stabilized.In two bearings, the inner ring of bearing A1 and rotating shaft 3 are connected as a single entity, and are formed with the raceway groove of half arc on the outer circumferential face of rotating shaft 3 in the position of bearing A1.Inner ring among the bearing B6 is socketed in the rotating shaft 3, is provided with the annular table terrace 12 perpendicular to rotating shaft 3 axis in rotating shaft 3, and the inner side surface of the inner ring among the bearing B6 and this step surface 12 are fitted.Above-mentioned locating piece is a nut 8 that is threaded in the rotating shaft 3, and nut 8 is positioned at the outside of bearing B6.Bearing B6 realizes axially locating by described nut 8 and step surface, and bearing A1 realizes axially locating by the raceway groove 12 and the spring 5 of half set in the rotating shaft 3 arc in rotating shaft 3.
In order to improve the stability of this disjunctor group diametrical connection contact bearing work, it radially is provided with locking mouth 10 described nut 8 upper edges, and the end near bearing B6 in rotating shaft 3 is axially arranged with opening 7 along it.Under normal circumstances, when nut 8 locks bearing B6 fully, the circumferential position of the opening 7 in the locking mouth 10 on the nut 8 and the rotating shaft 3 is consistent, be convenient to like this on opening 7 and locking mouth 10, be provided with the jig that is connected both, in order to avoid rotating shaft 3 is when rotating, because of making, action of centrifugal force takes place between nut 8 and the rotating shaft 3 to have influence on the relation of active force between two bearings and the spring 5, to have guaranteed the stability of this disjunctor group diametrical connection contact bearing work relative to circumferentially rotating.