CN211737759U

CN211737759U - Steel chain type roller retainer for roller linear guide rail

Info

Publication number: CN211737759U
Application number: CN201922009072.3U
Authority: CN
Inventors: 陆弘道; 李艳; 姚燕敏
Original assignee: Shanghai Rabbit Cnc Machine Tools Co ltd
Current assignee: Shanghai Rabbit Cnc Machine Tools Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-10-23
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a steel chain roller holder for roller linear guide, including chain base plate, be provided with a plurality of holder units on the chain base plate, a plurality of holder units set up along the extending direction equidistance of chain base plate, wherein each holder unit comprises two single holders that set up oppositely, cooperate between two single holders that set up oppositely to form the roller settling zone; and each single retainer is provided with an upper supporting claw, a middle supporting claw and a lower supporting claw, wherein the upper supporting claw, the middle supporting claw and the lower supporting claw are respectively in an arc shape matched with the outer surface of the roller. The scheme provided by the utility model not only can have high positioning precision, but also has good rotation flexibility; the utility model discloses the chain base plate adopts elastic steel plate, and use intensity is high, and flexibility and elasticity are good, and frictional force is littleer, has avoided traditional holder to cause the phenomenon of blocking the roller because of the bending, has avoided the nylon holder simultaneously, does not stand wear and tear, early fatigue fracture problem.

Description

Steel chain type roller retainer for roller linear guide rail

Technical Field

The utility model relates to a holder technical field especially relates to a roller is steel chain roller holder for linear guide.

Background

At present, a roller linear guide rail is generally composed of a guide rail, a sliding block, a rolling body, a reverser, a retainer and other parts. The working principle is that the rolling bodies roll in the raceways of the guide rail and the slide block to realize the linear motion of the rolling linear guide rail pair. Because the outer cylindrical surfaces of adjacent rollers move in opposite directions, in order to avoid direct friction, a retainer partially wrapping the rolling bodies is usually adopted and moves along with the rolling bodies to isolate the rolling bodies so as to keep a certain distance between the rolling bodies and avoid mutual contact between the two rolling bodies, and the retainer also usually guides the rolling bodies and normally moves between a guide rail and a sliding block of the rolling bodies. The cage is one of the main parts of the linear guide.

The cross section of the roller of the cage ball pocket of the prior art is circular, the rolling body is locked when the ball pocket is too small, so that the roller and the raceway slide, and the cage is unstable when the ball pocket is too large, so that the interaction between the cage and the roller is controlled, and the mutual friction gap is particularly important; the existing linear guide rail retainer in the market is usually formed by injection molding of nylon, and due to the characteristics of the material of the nylon retainer, the size of the linear guide rail retainer is correspondingly changed under the influence of environmental humidity when the linear guide rail retainer is used, so that the phenomenon that a roller is clamped when the roller is shortened or the roller is separated when the roller is increased occurs; in addition, the failure of the linear guide rail with the retainer is that the retainer is firstly broken, so that the product can not be used, and the early damage of the retainer is always a problem troubled by the linear guide rail.

SUMMERY OF THE UTILITY MODEL

Aiming at the unnecessary impact and friction of the roller to the ball pocket caused by the uncomfortable size of the ball pocket in the prior art; and the roller that the nylon holder caused blocks, drops, fracture scheduling problem, the utility model provides a steel chain roller holder for roller linear guide to reach and both ensured that positioning accuracy is high, the purpose that rotatory flexibility is good simultaneously, also avoided the nylon holder to contract the dimensional change who causes, and the nylon holder does not stand wear and tear, early fatigue easy fracture scheduling problem.

In order to achieve the above object, the present invention provides a steel chain roller holder for a roller linear guide, the holder includes a chain base plate, the chain base plate is provided with a plurality of holder units, the holder units are equidistantly arranged along an extending direction of the chain base plate, wherein each holder unit is composed of two single holders arranged oppositely, and a roller arrangement area is formed between the two single holders arranged oppositely; and each single retainer is provided with an upper supporting claw, a middle supporting claw and a lower supporting claw, wherein the upper supporting claw, the middle supporting claw and the lower supporting claw are respectively in an arc shape matched with the outer surface of the roller.

Furthermore, the upper support claw, the middle support claw and the lower support claw are respectively circular.

Further, the cambered surface concave direction of the middle supporting claw on each single retainer is opposite to the cambered surface concave direction of the upper supporting claw and the lower supporting claw.

Further, the cambered surface curvature of the upper support claw, the middle support claw and the lower support claw is 0.57 times of the diameter of the roller.

Furthermore, the ball pocket circle on the retainer is concentric with the excircle of the roller and is slightly larger than the excircle of the roller, and the ball pocket circle and the inner containing roller are on a horizontal line, and the change range of a gap formed according to the difference of the rollers is 0.05-0.50 mm.

Further, the chain-type base plate is integrally pressed and formed by an elastic steel plate.

The steel chain type roller retainer for the linear guide rail of the roller provided by the utility model achieves the purposes of high positioning precision and good rotation flexibility of the roller by designing the shape of the retainer ball pocket on the cross section of the roller into a circular shape; and the utility model provides a roller is steel chain roller holder for linear guide adopts the elastic steel structure, and use intensity is high, and flexibility and elasticity are good, can be crooked wantonly, have the self-resuming function after the deformation, do not receive external bending, striking influence, have avoided traditional holder to cause the phenomenon of blocking the rolling element because of the bending, simultaneously, have avoided the nylon holder not stand wear and tear, early fatigue fracture scheduling problem.

Drawings

The invention is further described with reference to the following drawings and detailed description.

FIG. 1 is a top view of a steel chain roller cage for a roller linear guide in this example;

FIG. 2 is a side view of the steel chain roller cage for the roller linear guide of the present example;

FIG. 3 is an enlarged illustration of the cage unit of FIG. 2;

FIG. 4 is a left side view of an example of a steel chain roller cage for a roller linear guide according to the present embodiment;

the reference numbers in the figures illustrate: the device comprises a chain-type base plate 10, a retainer unit 20, a mounting groove 20-1, a single retainer 21, an upper supporting claw 21-a, a middle supporting claw 21-b, a lower supporting claw 21-c, a roller 30 and a clearance 30-1.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

The retainer is one of main parts of the linear guide rail, and the retainer mainly acts on a separation rolling body in the linear guide rail; the rolling body is kept; guiding the rolling bodies to roll on the correct tracks; the rolling bodies are oriented, and the friction force is reduced. Therefore, the holder material is required to have high wear resistance, but high hardness is required to prevent "cohesion"; higher fatigue strength; the necessary elasticity and toughness; the friction loss is small, and the impact of the rolling body entering and exiting the load area can be alleviated; the pressure processing performance is relatively good; the material has enough rigidity and flexibility; the friction coefficient is small, the chemical stability is high, and the rust is not easy to occur under the external magnetic field.

Based on the function of the retainer in the linear guide rail, the scheme designs different circumferential clearances of the retainer.

In order to reduce the friction and impact of the pockets caused by the offset of the rolling elements in the non-uniform speed state, the pocket clearance not less than the minimum pocket clearance must be ensured, and the maximum pocket clearance which does not influence the stability of the cage must be considered. When the ball pocket is too small, the rolling body is locked, so that the roller and the raceway slide; the ball pocket is too large, the retainer is unstable, and for the two cases, the scheme is realized by designing the ball pocket into a circle which is concentric with and slightly larger than the excircle of the roller, wherein the change range of the gap in the horizontal direction is 0.05-0.50mm, and the gap is increased along with the increase of the diameter of the roller. In use, if the cage pocket clearance is too small, friction between the circumferential surface of the roller and the cage pocket is increased, and lubrication inside the guide rail is not smooth. The clearance is too large, the collision of the roller to the retainer is increased, and the adjacent roller can form a stretching or compressing effect on the retainer seriously to cause the early damage of the retainer, so that the design can ensure high positioning precision and ensure good rotation flexibility of the roller.

Aiming at the problems of the nylon retainer in the prior art, such as non-wear resistance, easy aging, fracture and the like, the material of the retainer in the utility model adopts the elastic steel structure, can be bent at will, has the self-recovery function, is not influenced by external bending, eliminates the mutual acting force and stress inside, and avoids the phenomenon that the rolling body is clamped due to the bending of the traditional retainer; meanwhile, the change of the size of the pocket gap cannot be influenced by the shrinkage of the conventional injection molding material, the fatigue resistance of the material is far higher than that of the conventional nylon retainer product, and the condition that the retainer is damaged in advance is prevented.

Based on the function and design scheme of the retainer in the linear guide rail, the retainer in the scheme is specifically described below by combining specific figures.

Referring to fig. 1, there is shown a top view of an example of a steel chain roller cage for a roller linear guide in this example. The steel chain type roller retainer for the roller linear guide rail is formed by pressing an integral chain type base plate 10, and the chain type base plate is made of an elastic steel plate, has a bending elastic self-recovery function and prolongs the service life of the retainer.

Furthermore, a plurality of identical holder units 20 are arranged on the chain-type base plate 10 at equal intervals, the holder units 20 are connected in series through the chain-type base plate 10 to form a flexible strip-shaped structure, each holder unit 20 is provided with a mounting groove 20-1 for placing a roller, two ends of the mounting groove are respectively provided with arc surfaces for clamping two ends of the roller 30, and the roller 30 can be kept in the mounting groove by the arrangement of the structure.

Referring to fig. 2 to 3, which are a side view and an enlarged view of a chain type roller cage made of steel for a roller linear guide in this example, and a cage unit, respectively, each cage unit 20 is formed of two cages 21, two individual cages 21 are oppositely disposed, and a mounting groove 20-1 for holding a roller 30 is formed between the two cages.

Referring to fig. 4, there is shown a left side view of an exemplary steel chain roller cage for a roller linear guide shown in fig. 1.

As can be seen in the figure, each single retainer 21 is composed of an upper supporting claw 21-a, a middle supporting claw 21-b and a lower supporting claw 21-c, wherein the middle supporting claw 21-b is concave opposite to the cambered surfaces of the upper supporting claw 21-a and the lower supporting claw 21-c; wherein, the middle supporting claw 21-b is arranged at the middle part, is concave upwards and is used for clamping the arc surface at the middle of the roller 30; the upper supporting claw 21-a and the lower supporting claw 21-c are respectively arranged at two ends of the middle supporting claw 21-b, are concave downwards and are used for clamping arc surfaces at two ends of the roller 30.

Further, the camber curvature of the upper supporting claw, the middle supporting claw and the lower supporting claw is set to be 0.57 times of the diameter of the roller. The arrangement can give consideration to the contact point stress, the lubricating performance and the anti-friction performance of the retainer, and the ratio of the radius of the pocket of the retainer to the circumferential diameter of the roller is controlled to be 0.56-0.58 through experiments.

The upper support jaw 21-a, the middle support jaw 21-b and the lower support jaw 21-c thus arranged have good elastic properties, can be bent and can be self-restored due to the curved arc structures of the upper support jaw 21-a, the middle support jaw 21-b and the lower support jaw 21-c.

The single holder 21 thus constructed is arranged such that two single holders 21 are oppositely arranged to form one holder unit 20, where the upper support claws 21-a, the middle support claws 21-b and the lower support claws 21-c of the two single holders 21 are bent in opposite directions.

Referring to fig. 3, which is an enlarged view showing the cage unit in this example, the clearance between the cage pockets and the cylindrical surface is also designed as follows: the play is large along the direction of movement of the column center and small in the vertical direction. The purposes of ensuring high positioning precision and good rotation flexibility are achieved. Preferably, the vertical play is reduced from the horizontal by 13-25 microns, and the clearance is reduced as the diameter of the rollers is reduced.

The steel chain type roller retainer for the roller linear guide rail, which is formed according to the scheme, has the function of bending elasticity self-recovery, is not influenced by external bending and impact, is suitable for the motion state of a bent linear alternating pulsating circulation linear guide rail, avoids the phenomenon that a rolling body is clamped by a traditional retainer due to bending after the treatment of eliminating the internal stress of materials, and simultaneously avoids the size change of the plastic retainer after the plastic retainer is used for a period of time due to shrinkage; in particular to a plastic retainer which solves the problems of non-wear resistance and early fatigue fracture of the prior plastic retainer.

When the steel chain type roller retainer for the roller linear guide rail is applied, the abrasion caused by sliding friction can be reduced, and particularly under high-speed operation, the collision, the frictional abrasion and the heating of the inner rolling body and the retainer are relieved under the action of centrifugal force and inertia force, so that the early fatigue damage of the retainer is caused.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A steel chain type roller retainer for a roller linear guide rail is characterized by comprising a chain type base plate, wherein a plurality of retainer units are arranged on the chain type base plate and are arranged at equal intervals along the extending direction of the chain type base plate, each retainer unit is composed of two single retainers which are arranged oppositely, and a roller arrangement area is formed by matching the two single retainers which are arranged oppositely; and each single retainer is provided with an upper supporting claw, a middle supporting claw and a lower supporting claw, wherein the upper supporting claw, the middle supporting claw and the lower supporting claw are respectively in an arc shape matched with the outer surface of the roller.

2. The steel chain roller cage for a roller linear guide according to claim 1, wherein the upper support jaw, the middle support jaw and the lower support jaw are respectively circular.

3. The steel chain roller cage for a roller linear guide according to claim 1, wherein the concave direction of the arc surface of the middle support jaw on each individual cage is opposite to the concave direction of the arc surface of the upper support jaw and the lower support jaw.

4. The steel chain roller cage for a roller linear guide according to claim 1, wherein the upper, middle and lower support jaws have an arc curvature of 0.57 times the diameter of the roller.

5. The steel chain roller holder for a roller linear guide according to claim 1, wherein a ball pocket circle on the holder is concentric with and slightly larger than an outer circle of the roller, and forms a gap varying range of 0.05-0.50mm according to a difference in diameter of the roller on a horizontal line with the inner containing roller.

6. The steel chain roller holder for a roller linear guide according to claim 1, wherein the chain base plate is integrally press-formed of an elastic steel plate.