TW201917302A - Ball bearing circular slide rail - Google Patents

Abstract

Present invention relates a ball bearing circular slide rail, including: an outer rail; a sliding device solidly disposed on the outer rail, the sliding device has an inner rail and a ball circulator, wherein two loaded ball tracks formed between two side of the inner rail and two inner side of the outer rail, two ball passages provided on the ball circulator; two end of the ball circulator extending outside of two end of the inner rail, plurality of semi-circular passage provided on two end of the ball circulator, each of the semi-circular passage connected between two end of loaded ball tracks and the ball passages; the two loaded ball tracks, the two ball passages, and the semi-circular passages are composed with two ball circular channels, for guiding several ball circulating in the two ball circular channels.

Description

 Ball circulation slide  

The invention relates to a ball circulation slide rail, in particular to a ball circulation slide rail which is used for a slide rail of a type such as a drawer slide rail or a servo slide rail.

Because the ball type slide rail has the advantages of smooth movement and stable structure, it is widely used in cabinets, system furniture, server cabinets, display brackets, and sliding frames of other electronic products. The existing ball slides used in drawers or server cabinets are usually made by sheet metal rolling, and the structure generally comprises a fixed rail, a movable rail disposed inside the fixed rail, and a plurality of fixed rails and activities. Ball cage between the rails. Through the ball retainer, a plurality of balls can be held between the movable rail and the fixed rail, so that the movable rail and the fixed rail are in rolling contact to reduce the resistance when the movable rail moves.

Since the two sides of each ball simultaneously contact the ball grooves of the movable rail and the fixed rail, when the movable rail and the fixed rail slide relative to each other, each of the balls will roll between the two ball grooves of the movable rail and the fixed rail and generate a linear displacement. And the ball cage will also move linearly with the balls. In an ideal situation, when the movable rail is displaced inside the fixed rail, there is only rolling contact between the ball and the ball groove of the movable rail and the fixed rail without relative sliding, and the movement of the ball and the ball retainer It will be an equal proportional relationship of one-half of the displacement distance of the active rail.

However, the reality is that when the movable rail is reciprocally displaced inside the fixed rail, the balls tend to slip relative to the ball grooves of the movable rail and the fixed rail due to insufficient friction or other factors. When the balls are slipped, the moving distance of the plurality of balls is not equal to one-half of the moving stroke of the movable rail, and the relative position of the movable rail and the ball retainer is also offset. Moreover, when the relative position of the ball retainer and the movable rail is offset, the movable rail is displaced to one of the end positions of the reciprocating stroke, and the end of the ball retainer comes into contact with the stopper at both ends of the fixed rail early, so When the movable rail has not reached the end position, it will be hindered by the ball retainer and cannot continue to be displaced, thus causing the stroke length of the movable rail to be reduced.

This type of ball slide with a ball cage is usually mounted in a horizontal direction, so that the aforementioned position of the ball retainer is not easy to occur, but more and more products have to utilize the vertically-actuated ball slide. When the ball slide is mounted in the vertical direction, the aforementioned positional shift of the ball retainer will become more frequent due to the effect of gravity.

In addition, there is another type of linear slide on the market for the use of a ball circulator to arbitrarily arrange a plurality of balls between the slide channels of the slide and the linear slides so that the slides are arranged in a sliding manner. On the sex rails. Although the linear slide rail of this type does not need to use the structure of the ball retainer, since the structure of the ball circulator is quite complicated, and the structural design requires precise machining, the volume thereof cannot be reduced, and the cost is high, so that the Types of linear slides are generally suitable for use in precision instruments or machinery and are not suitable for use in the field of drawer slides or servo slides.

Due to the above reasons, the existing ball slide rails have various shortcomings. Therefore, how to solve the above problems through structural improvement has become one of the important issues to be solved by the business.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a ball recirculating slide which can omit the use of a ball retainer used in the existing ball slide and which overcomes the problem of shortening the stroke due to the positional shift of the ball retainer when the existing ball slide is vertically mounted.

Another object of the present invention is to provide a ball circulation slide rail which is simple in construction and inexpensive to manufacture.

An embodiment of the present invention provides a ball circulation slide rail, which includes: an outer rail having two outer rail side plates parallel to each other and opposite to each other, the two outer rail side plates collectively defining a guide channel, and the outer rail side plate An outer ball groove is disposed on each of the outer rail side plates; a sliding device is disposed in the guiding channel of the outer rail, the sliding device includes an inner rail, and a circulator; wherein the inner rail faces the two outer An inner ball groove is disposed on each side of the ball groove, and the two inner ball grooves respectively define two ball tracks together with the two outer rolling grooves; the circulator is assembled on the inner rail, and the circulator is provided with two ball cycles a groove, the two ball circulation grooves are located on the circulator between the two ball tracks, and are parallel to the two ball tracks; the front end and the rear end of the circulator are not protruded from the front and rear ends of the inner rail The front end and the rear end of the circulator are respectively provided with two rotary grooves, which are respectively connected to the two ball circulation grooves and the front end and the rear end of the two ball tracks; the two ball circulation grooves, the two ball tracks and The rotary grooves Cooperating to form two circulation channels; a plurality of balls respectively accommodated in the two circulation channels, and when the sliding device slides along the guiding channel, the balls can cyclically pass through the two ball tracks, so that the ball A rolling contact is formed between the inner rail and the outer rail through the balls to reduce the resistance between the sliding device and the outer rail; and two cover plates are disposed at the front end and the rear end of the circulator, and The rotary grooves are shielded to prevent the balls from falling out of the rotary grooves.

In a preferred embodiment of the present invention, the inner rail has an inner rail top plate, and two inner rail side plates connected to two sides of the inner rail top plate, and the two inner ball grooves are respectively disposed on the two inner rail side plates, the two The inner rail side plate and the inner side surface of the inner rail top plate together define a receiving portion; the circulator has a body portion, the body portion is received in the receiving portion; the two ball circulation grooves and the rotating grooves are respectively disposed on the body portion One side of the inner rail top plate.

In a preferred embodiment of the present invention, the two ball circulation grooves are respectively defined by an inner wall of a circulation groove and an outer wall of a circulation groove; the inner walls of the two circulation grooves are respectively disposed at two sides of the body portion of the circulator, The outer walls of the two circulating grooves are respectively disposed on one side of the circulator near the side plates of the two inner rails.

In a preferred embodiment of the present invention, the outer wall of the two circulating grooves and the side plates of the two inner rails are spaced apart from each other, and the outer walls of the two circulating grooves are provided with a plurality of ribs on one side of the side plates of the two inner rails, and the ribs are provided. The two outer circumferential side walls extend toward the inner rail side plates and abut against the inner side surfaces of the inner rail side plates.

In a preferred embodiment of the present invention, the rotary grooves are respectively defined by an arc-shaped wall and a turning portion, wherein the turning portions are respectively extended from the front end and the rear end of the outer wall of the two circulating grooves, and then After being bent into an arc shape in the direction of the two inner rail side plates, the end portions abut against the front end and the rear end of the two inner rail side plates.

In a preferred embodiment of the present invention, a gap is formed between the back surface of the turning portion and the outer wall of the circulating grooves, so that the turning portions have bendable elasticity.

In a preferred embodiment of the present invention, the front end and the rear end of the two inner side plates and the edge of the connecting portion of the turning portions are respectively provided with arc-shaped or inclined surface guiding portions to guide the balls into the two ball tracks.

In a preferred embodiment of the present invention, the end portions of the two inner rail side plates have an end portion, and the distance between the end portions and the outer ball grooves is smaller than the ball diameters, so that the The balls are capable of interfering with the end portions.

In a preferred embodiment of the present invention, an end of the arcuate wall adjacent to the opening direction of the two ends of the ball track respectively extends to form an extension portion; the two extension portions are away from the end of the arcuate wall adjacent to the outer ball groove The direction of the rotary groove extends.

In a preferred embodiment of the present invention, the circulator is further provided with two oil storage planes respectively adjacent to one side of the two ball tracks, and the balls are passed when the balls pass through the two ball tracks. The two oil storage planes can be accessed.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

10‧‧‧ outer rail

11‧‧‧ Guide channel

12‧‧‧ outer rail side panels

13‧‧‧Outer ball groove

20‧‧‧Sliding device

21‧‧‧ Circulator

211‧‧‧ Body Department

211a‧‧‧镂空部

211b‧‧‧Circulation wall

212‧‧‧Rolling cycle

213‧‧‧Circulation groove outer wall

214‧‧‧ ribs

215‧‧‧Rotary groove

215a‧‧‧ curved wall

216‧‧‧ turning section

216a‧‧‧ gap

216b‧‧‧ end section

217‧‧‧Extension

218‧‧‧ oil storage plane

219‧‧‧ screw holes

22‧‧‧ Inner rail

221‧‧‧ inner rail side panel

222‧‧‧ Housing

223‧‧‧screw perforation

224‧‧‧inside ball groove

224a‧‧ Guidance Department

225‧‧‧ inner rail roof

226‧‧‧Keyhole

227‧‧‧ nicks

23, 23a‧‧‧ cover

231‧‧‧ Screw perforation

232‧‧‧Arc ditch

233‧‧‧Snap flange

24‧‧‧ balls

25‧‧‧Roll track

26‧‧‧Circular passage

28‧‧‧Connecting Department

1 is a perspective assembled view of a first embodiment of a ball cycle slide of the present invention.

2 is a partial perspective assembled view of a first embodiment of a sliding device used in the present invention.

Figure 3 is a partially exploded perspective view of the sliding device used in the present invention.

Fig. 3A is a partially enlarged perspective view showing the position of both ends of the circulator used in the present invention.

Fig. 3B is an enlarged perspective view of the cover plate used in the present invention taken from the bottom surface direction.

3C is a cross-sectional view showing the combination of the cover plate and the circulator engaging structure of the ball circulation slide rail of the present invention.

Figure 4 is a perspective view of the combination of the circulator and the inner rail employed in the present invention.

Figure 5 is a combined cross-sectional view of the ball circulation slide of the present invention taken along the longitudinal section.

Figure 6 is a partially enlarged cross-sectional view taken from Figure 5 for revealing the structure of the rotary groove and the ball track and the ball circulation groove of the circulator.

Figure 7 is a combined cross-sectional view of the ball circulation slide of the present invention taken along the cross-sectional direction.

Fig. 8 is a partially enlarged cross-sectional view showing a modified embodiment of the ball circulation rail of the present invention in which the guide portion is disposed at the edge position of the inner ball groove.

Figure 9 is a perspective assembled view of a second embodiment of the ball cycle slide of the present invention.

Figure 10 is a perspective exploded view of a second embodiment of the ball circulation slide of the present invention.

Figure 11 is a cross-sectional view showing the assembly of the second embodiment of the ball circulation slide of the present invention.

[First Embodiment]

As shown in FIG. 1 to FIG. 3, a first embodiment of the present invention provides a ball circulation slide rail, which comprises: an outer rail 10 and a sliding device 20. The outer rail 10 has a guiding channel 11 , and the sliding device 20 is slidably disposed in the guiding channel 11 . The sliding device 20 includes an inner rail 22 and a circulator 21 disposed on the inner rail 22, and the plurality of balls 24 are held by the circulator 21 to circulate between the inner rail 22 and the outer rail 10, When the sliding device 20 and the outer rail 10 are relatively reciprocally displaced, the balls 24 can be kept in rolling contact with the outer rail 10 to reduce the sliding resistance of the sliding device 20.

As shown in FIG. 1, FIG. 5 and FIG. 7, the outer rail 10 of the present invention is a rail made of a metal sheet and roughly formed into an M-shaped cross-section, and the guide rails 11 of the outer rail 10 have two sides on both sides. The two outer rail side plates 12 are respectively provided with an outer ball groove 13 on the two outer rail side plates 12. The two outer ball grooves 13 are opposed to each other, and the cross-sectional shapes of the outer ball grooves 13 and the balls 24 cooperate with each other such that the balls 24 can roll along the outer ball grooves 13.

The inner rail 22 of the sliding device 20 is made of a metal plate. The inner rail 22 has an inner rail top plate 225, and has an inner rail side plate 221 on both sides of the inner rail top plate 225, when the sliding device 20 When disposed on the outer rail 10, the two inner rail side plates 221 of the inner rail 22 are respectively adjacent to the two outer rail side plates 12 of the guiding channel 11, and the outer sides of the two inner rail side plates 221 correspond to the two outer ball slots. An inner ball groove 224 is respectively disposed at the position of 13. The two inner ball grooves 224 and the two outer ball grooves 13 are opposed to each other and together constitute two ball tracks 25. When the balls 24 are received in the two ball tracks 25, the balls 24 are respectively in contact with the outer ball groove 13 and the inner ball groove 224, so that the inner rail 22 is in contact with the outer rail 10 through the balls 24 .

As shown in FIGS. 3 to 5, the inner rail side plates 221 of the inner rail 22 and the inner side surfaces of the inner rail top panel 225 collectively define a receiving portion 222 for receiving the circulator 21. The circulator 21 has a body portion 211. The body portion 211 is provided with a plurality of hollow portions 211a for reducing the amount of material of the circulator 21 and reducing the weight. The body portion 211 is further provided with a plurality of screw holes 219. The inner rail 22 is provided with a plurality of screw holes 223 corresponding to the positions of the screw holes 219, and the main body portion 211 of the circulator 21 is fixed to the screw holes 223 and the screw holes 219 by screws. The housing portion 222 of the inner rail 22 is in the housing portion 222. At the same time, the inner rail top plate 225 of the inner rail 22 is further provided with a plurality of locking holes 226, which can be locked by screws, thereby locking a moving object (not shown) on the inner rail 22. .

The circulator 21 further has two ball circulation grooves 212 on both sides of the main body portion 211. The two ball circulation grooves 212 are respectively defined by a circulation groove inner wall 211b and a circulation groove outer wall 213. The two circulating groove inner walls 211b are respectively disposed on two sides of the main body portion of the circulator, and the two circulating groove outer walls 213 are respectively disposed on one side of the circulator 21 adjacent to the two inner rail side plates 221 .

The circulation groove inner wall 211b and the circulation groove outer wall 213 are parallel to each other, and the distance between the two is larger than the diameter of the balls 24, so that the plurality of balls 24 can roll in the ball circulation groove 212. Through the two ball circulation grooves 212, a plurality of balls 24 can be guided to circulate between the two ball tracks 25 and the two ball circulation grooves 212, so that when the inner rail 22 is reciprocally displaced inside the outer rail 10, The balls 24 that are separated from one end of the ball track 25 can be returned to the other ends of the two ball tracks 25 via the guiding of the two ball circulation grooves 212, thereby causing the sliding device 20 to reciprocally slide inside the outer rail 10, the two ball tracks Within 25, a sufficient number of balls 24 can be maintained to roll inside.

A distance between the two outer circumferential wall 213 of the circulator 21 and the inner rail side wall 221 is maintained, and the outer side surfaces of the outer wall 213 of the two circulating grooves are respectively provided with a plurality of ribs 214, and the ribs 214 are separated from the two circulating grooves. The surface of the outer wall 213 extends toward the inner side surface of the inner rail side plates 221 of the inner rail 22, and the ends of the ribs 214 abut against the inner side surfaces of the inner rail side plates 221, thereby enabling the circulator 21 to pass through. The ribs 214 are engaged between the two inner rail side plates 221 of the inner rail 22, and a gap is maintained between the two circulating groove outer walls 213 of the circulator 21 and the inner side surface of the inner rail 22.

As shown in FIG. 4, FIG. 5 and FIG. 6, the front end and the rear end of the circulator 21 protrude from the front and rear ends of the inner rail 22, and two swings are respectively arranged at the front end and the rear end of the circulator 21. Slot 215. The swivel grooves 215 are generally arcuate guide channels for the balls 24 to roll within the swivel grooves 215. Each of the rotary grooves 215 is connected to each of the ball circulation grooves 212 and the front end or the rear end of the adjacent ball track 25, so that the front end and the rear end of each of the ball circulation grooves 213 and its adjacent ball track 25 can be Connected to each other. The two ball tracks 25 and their adjacent ball circulation grooves 212 and the plurality of rotation grooves 215 collectively constitute two circulation passages 26, so that when the inner rail 22 and the outer rail 10 are relatively displaced, the balls 24 can continuously The two ball tracks 25 and the ball circulation groove 212 adjacent thereto are cyclically rolled.

As shown in FIG. 4, FIG. 5 and FIG. 6, in this embodiment, each of the rotary grooves 215 is defined by a curved wall 215a and a turning portion 216, respectively. The arcuate walls 215a are respectively formed on the outer side walls of the respective rotary grooves 215, and the turning portions 216 are integrally formed integrally with the front end and the rear end of the outer wall 213 of the two circulating grooves, and constitute the inner ends of the rotary grooves 215. Side wall. The shape of the turning portion 216 is extended forward from the front end and the rear end of the outer wall 213 of the two circulating grooves, and then bent by 180 degrees in an arc path, and then the end extends in the direction of the inner rail side plate 221, and is offset. The front end and the rear end of the two inner rail side plates 221 are opposed. The outer side surface of the turning portion 216 forms an arc-shaped bent wall surface, so that the rotating grooves 215 can be defined together with the curved walls 215a.

As shown in FIG. 4 and FIG. 6 , it can be clearly seen that when the circulator 21 is assembled on the inner rail 22 , the end portions of the turning portions 216 are respectively connected to the front ends of the inner rail side plates 221 of the inner rail 22 and the rear ends thereof. And the outer sides of the turning portions 216 are respectively aligned with the bottom surfaces of the inner ball grooves 224, so that the balls 24 are rolled from the inner ball grooves 224 to the turning portion 216, or are rolled along the turning portion 216 into the two portions. In the case of the ball groove 224, the balls 24 can be smoothly rolled without being hindered.

The circulator 21 further has two cover plates 23 disposed on the outer sides of the front and rear ends of the circulator 21 and covering the outer sides of the rotary grooves 215 to enable the balls 24 to be held therein. It is rotated in the groove 215 without falling out. As shown in FIG. 3B and FIG. 7 , the two cover plates 23 of the present invention are respectively provided with a screw through hole 231 so that the cover plate 23 can be screwed to the outer side surface of the front and rear ends of the circulator 21 . The two cover plates 23 are disposed on one side of the circulator 21 with two arcuate grooves 232 corresponding to the plurality of rotary grooves 215. The paths of the arcuate grooves 232 correspond to the plurality of rotary grooves 215, and can The rotary grooves 215 collectively guide the balls 24. The two cover plates 23 form an engaging flange 233 substantially perpendicular to the bottom side of the cover plate 23 at the edge of the arcuate groove 232. As shown in FIG. 7, the shape and contour of the engaging flanges 233 cooperate with the two. The arcuate wall 215a of the rotary groove 215, when the cover plate 23 is combined with the front and rear ends of the circulator 21, the engagement flanges 233 are respectively engaged with the inner side of the curved wall 215a of the rotary groove 215, thereby positioning the two The cover plate 23 prevents the positional displacement of the cover plate 23.

As shown in FIG. 3A and FIG. 6, the rotary groove on the circulator 21 of the present invention extends from the end of the outer wall 213 of the circulation groove and then reversely turns toward the inner ball groove 224 of the inner rail 22. Therefore, a gap 216a is formed between the turning portion 216 and the outer wall 213 of the two circulating grooves, so that the turning portion 216 has elasticity which is bendable, so that the balls 24 rolling in the rotating groove 215 are subjected to pressure as shown in FIG. When pressed or vibrated, the turning portion 216 can be elastically deformed to buffer the vibration and noise of the ball 24.

In addition, as shown in FIG. 3 and FIG. 3A, the circulator 21 of the present invention extends in an direction away from the rotation grooves 215 at an end of the curved wall 215a of each of the rotary grooves 215 adjacent to the two outer rail side plates 11 to form an extension. Part 217. The ends of the two extending portions 217 form a sharp protruding plate, and when the balls roll to the inner side of the extending portion 217 of the rotating groove 215, a part of the lubricating grease on the surface of the ball 24 can be scraped by the extending portion 217, and Remaining at the edge and outside of the extension 217, the ball 24 is able to contact the grease retained on the extension 217 as it enters or exits the swivel groove 215 to ensure that the surface of the ball 24 is evenly wrapped with grease.

In addition, as shown in FIG. 3 and FIG. 3A, the two sides of the circulator 21 of the present invention further have one oil storage plane 218, and the two ends of the two oil storage planes 218 are respectively connected to the openings of the two rotary grooves 215. Between and adjacent to one side of the two ball tracks 25, respectively, the surface of the balls 24 can contact the two oil reservoirs 218 as the balls 24 roll along the two ball tracks 25. The two oil reservoirs 218 are capable of adhering grease so that the grease remains on the two oil reservoirs 218, thereby allowing the balls 24 to be evenly wrapped with grease when rolling through the ball tracks 25.

In addition, as shown in the embodiment of FIG. 8, the present invention can further provide a guiding portion 224a at the end edges of the inner ball grooves 224 of the inner rail side plates 221 of the inner rail 22, so that the inner inner ball grooves are respectively provided. The both end openings of the 224 are engageable through the ends of the guiding portion 224a and the turning portion 216. The guiding portion 224a has a substantially arc-shaped or inclined surface shape, so that a guide bevel is formed at the opening of both ends of the inner ball groove 224, so that the ball 24 can be guided into the ball track 25 and the ball collision can be avoided. The opening edge of the inner ball groove 224 is used for the purpose of reducing ball rolling noise.

Further, the present invention can also design the end portion 216b of the turning portion 216 to be inclined slightly toward the direction of the outer ball groove 13, so that the distance between the end portion 216b of the turning portion 216 and the outer ball groove 13 is slightly smaller than that of the ball 24 diameter of. In this embodiment, when the balls 24 pass through the ends of the rotary grooves 215, they will interfere with the end portions 216b of the turning portion 216. However, since the turning portions 216 have the elasticity of bending deformation, the balls 24 can easily pass through the turning portions. The end portion 216b of the 216 interferes and enters the ball track 25. Further, by the interference of the end portion 216b, when the ball enters the ball track 25, the outer ball groove 13 is first contacted, so that the edge collision of the ball 24 and the inner ball groove 224 can be reduced.

[Second embodiment]

9 to 11, a second embodiment of the present invention, in which the sliding device 20 is provided with two circulators 21, the length of the two circulators 21 being shorter than the length of the inner rail 22, and They are respectively disposed at two ends of the inner rail 22, and the two circulators 21 are connected through a connecting portion 28. The two circulators 21 are respectively provided with a ball circulation groove 212 and a rotation groove 215 for cooperating with the inner rail 22 and the outer rail 10 to jointly form a ball circulation passage. The structure and operation principle of the two circulators 21 are the same as those of the first embodiment, and therefore the description will not be repeated.

One end of the two circulators 21 protruding from the inner rail 22 is defined as an outer end, and one end of the two circulators 21 hidden inside the inner rail 22 is defined as an inner end, and the inner rail 22 is engaged with a rotary groove 215 of the inner end of the two circulators 21 The outlets are respectively provided with four notch portions 227 through which the balls 24 that are separated from the openings of the rotary grooves 215 at the inner ends of the two circulators 21 can pass. At the same time, the inner ends of the two circulators 21 are respectively provided with a cover plate 23a, and the two cover plates 23a can be fitted into the notch portion 227 and cover the exposed portion of the circulator 21 from the notch portion 227, thereby preventing the circulator from being circulated. The ball 24 exiting the outlet of the rotary groove 215 at the inner end of 21 falls out.

According to the second embodiment of the present invention, the overall length of the circulator 21 is made smaller than the length of the inner rail 22, so that the weight reduction effect can be achieved, or the inner rail 22 having a longer length can be used.

[Advantageous Effects of Invention]

The beneficial effects of the ball cycle slide of the present invention are mainly as follows:

1. The ball circulation slide rail of the present invention eliminates the ball cage, thereby avoiding the problem that the existing ball slide rail is displaced due to the positional shift of the ball cage, resulting in a reduction in the inner rail slide stroke.

2. The structure of the circulator 21 and the inner rail 22 used in the present invention is much simpler than the existing linear slide circulator, and does not require precise grinding processing, so the cost is much higher than that of the existing linear slide. It is low-cost and suitable for use on ball slides such as drawer slides and servo slides.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, equivalent technical changes made by using the present specification and the contents of the drawings are included in the protection scope of the present invention. .

Claims (10)

 A ball circulation slide rail, comprising: an outer rail having two outer rail side plates parallel to each other and opposite to each other, the two outer rail side plates collectively defining a guiding channel, and the two outer rail side plates respectively An outer ball groove is disposed; a sliding device is disposed in the guiding channel of the outer rail, the sliding device includes an inner rail, and a circulator; wherein the inner rail faces the two sides of the two outer ball grooves An inner ball groove is respectively disposed, and the two inner ball grooves respectively define two ball tracks together with the two outer rolling grooves; the circulator is assembled on the inner rail, and the circulator is provided with two ball circulation grooves, and the two ball circulations a slot is located between the two ball tracks on the circulator and parallel to the two ball tracks; the front end and the rear end of the circulator protrude from the front and rear ends of the inner rail, and the front end of the circulator And the rear end are respectively provided with two rotary grooves, which are respectively connected to the two ball circulation grooves and the front end and the rear end of the two ball tracks; the two ball circulation grooves, the two ball tracks and the rotary grooves are combined Two-cycle channel a plurality of balls respectively received in the two circulation passages, and when the sliding device slides along the guiding channel, the balls can cyclically pass through the two ball tracks, so that the inner rail and the outer rail Rolling contact is formed through the balls to reduce the resistance between the sliding device and the outer rail; and two cover plates are disposed at the front end and the rear end of the circulator, and the rotating grooves are shielded. In order to prevent the balls from falling out of the rotary grooves.    The ball circulation slide rail according to claim 1, wherein the inner rail has an inner rail top plate, and two inner rail side plates connected to both sides of the inner rail top plate, and the two inner ball grooves are respectively disposed on the inner rails. The inner side of the two inner rail side panels and the inner rail top panel together define a receiving portion; the circulator has a body portion, the body portion is received in the receiving portion; the two ball circulation grooves and the plurality of rotating slots are respectively disposed The body portion faces a side of the inner rail top plate.    The ball circulation slide rail according to claim 2, wherein the two ball circulation grooves are respectively defined by an inner wall of a circulation groove and an outer wall of a circulation groove; the inner walls of the two circulation grooves are respectively disposed on the body of the circulation device On both sides of the portion, the outer walls of the two circulating grooves are respectively disposed on one side of the circulator near the side plates of the two inner rails.    The ball circulation slide rail according to claim 3, wherein the outer wall of the two circulating grooves and the side plates of the two inner rails are spaced apart from each other, and the outer walls of the two circulating grooves are provided with a plurality of ribs on one side of the side plates of the two inner rails. The ribs extend from the outer wall of the two circulation grooves toward the two inner rail side plates, and abut against the inner side surfaces of the two inner rail side plates.    The ball circulation slide rails of claim 4, wherein the plurality of rotary grooves are respectively defined by a curved wall and a turning portion, wherein the turning portions are respectively extended by the front end and the rear end of the outer walls of the two circulating grooves After being bent and curved in a direction toward the side plates of the two inner rails, the end portions abut against the front end and the rear end of the two inner rail side plates.    The ball circulation slide rail according to claim 5, wherein a gap is formed between the back surface of the turning portion and the outer wall of the circulation groove, so that the turning portions have bendable elasticity.    The ball circulation slide rail according to claim 6, wherein the front end and the rear end of the two inner side plates and the edge of the connecting portion of the turning portions are respectively provided with arc-shaped or inclined surface guiding portions to guide the balls to enter. The two ball tracks.    The ball circulation slide rail according to claim 6, wherein the one end portion of the two inner rail side plates has an end portion, and the distance between the end portion and the outer ball grooves is smaller than the ball diameters. So that the balls can interfere with the end portions.    The ball circulation slide rail of claim 5, wherein the arcuate walls extend toward an opening end of the ball rails at both ends to form an extension portion; the two extension portions are adjacent to the outer ball by the arcuate walls. One end of the groove extends in a direction away from the rotary groove.    The ball circulation slide rail according to claim 9, wherein the circulator is further provided with two oil storage planes respectively adjacent to one side of the two ball tracks, when the balls pass the two ball tracks When the balls are in contact with the two oil storage planes.