Plane linear bearing

Abstract

The utility model provides a plane linear bearing which comprises a base and an end cover, the base is provided with an annular arc groove, the annular arc groove comprises an inner side channel close to the inner side and an outer side channel close to the outer side, the inner side channel is connected with the outer side channel through a transition channel which is arranged in an inclined mode, and the end cover is connected with the inner side channel. The inner side channel and the outer side channel are arranged in a height difference mode, the outer side channel is communicated with the outer side, the ball located in the outer side channel protrudes out of the bottom face of the base, the end cover comprises a first connecting part and a second connecting part which correspond to the outer side channel and the inner side channel, the first connecting part is matched with the steel ball on the outer side channel in an abutting mode, and the second connecting part is matched with the steel ball on the outer side channel in an abutting mode. And gaps are formed between the second connecting parts and the steel balls in the inner side channel rows for the steel balls to move up and down, so that the friction torque is reduced, the transmission efficiency is improved, the traditional sliding friction is changed into rolling friction, the friction torque is reduced, the noise is reduced, the transmission efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to a planar linear bearing. Background Art

[0002] A planar linear bearing is a mechanical component used for linear motion guidance. It can support moving parts and enable them to move smoothly along a linear trajectory. The planar linear bearing can bear axial loads and certain radial loads, has a small friction coefficient, high motion accuracy, is suitable for high-speed and precise linear motion, has a simple structure, and is relatively easy to install and maintain.

[0003] Currently, planar linear motion mainly adopts sliding friction, with a large contact surface, a large frictional torque, low transmission efficiency, the need for precision machining of the bearing contact surface, high costs, and high noise, low transmission efficiency, and a short service life. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a planar linear bearing.

[0005] To achieve the above object, the utility model provides a planar linear bearing, including a base and an end cover. The base is provided with two annular arc grooves for installing and reciprocating movement of balls. The two annular arc grooves are symmetrically distributed with respect to the center of the base. The annular arc groove includes an inner channel near the inner side and an outer channel near the outer side. The inner channel and the outer channel are connected by an inclined transition channel. There is a height difference between the inner channel and the outer channel. The outer channel is communicated with the outside. The balls located in the outer channel protrude from the bottom surface of the base. The end cover includes a first connection part and a second connection part corresponding to the outer channel and the inner channel. The first connection part is in abutting cooperation with the steel balls on the outer channel, and there is a gap between the second connection part and the steel balls in the inner channel for their up and down movement.

[0006] Further, a connection structure is provided between the base and the end cover. The connection structure includes connectors arranged on both sides of the base and connection holes arranged on the end cover corresponding to the installation and connection of the connectors. The connector includes a connection part and an elastic interference part arranged on the connection part. The diameter of the connection part is smaller than that of the elastic interference part. The elastic interference part is provided with a plurality of slots penetrating in the radial direction. The connection hole moves to the position of the connection part through the deformation of the elastic interference part to form a clamping fit with the base.

[0007] Further, a guiding inclined surface distributed circumferentially is arranged on the outer edge of the connection part.

[0008] Further, the end cover is bent. The first connection part and the second connection part of the end cover are connected by an inclined connecting plate, and the connecting plate is installed corresponding to the transition channel of the annular arc groove.

[0009] Further, the clearance between the second connecting portion and the steel balls in the inner groove is 5-14 mm.

[0010] Further, the surface roughness of the end cover is less than Ra0.15, and the thickness difference of the single-piece end cover is less than or equal to 0.01 mm.

[0011] The beneficial effects of the present utility model are as follows: By providing two annular arc grooves, there is a height difference between the inner and outer sides of the annular arc grooves, the bottom of the outer groove is empty, and the balls can protrude from the bottom surface to achieve the load-bearing function. The bottom of the inner side of the groove is in a closed state, and there are smooth transition regions at both ends, so as to realize the reciprocating movement of the balls. A clearance is provided between the second connecting portion and the steel balls in the inner groove for their up and down movement, which can enable the balls to have a certain clearance during the reciprocating movement to make the circular movement smooth, prevent the circular movement from being stuck due to the lack of clearance, change the traditional sliding friction to rolling friction, reduce the frictional torque, improve the transmission efficiency, change the traditional sliding friction to rolling friction, reduce the frictional torque, reduce the noise, improve the transmission efficiency and service life; reduce the processing precision requirements of the mating parts and reduce the cost. It is convenient for installation and maintenance: The design of the base and the end cover makes the installation and maintenance of the device simpler, because the mating relationship between the components is clear and easy to operate. Description of the Drawings

[0012] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0013] Figure 2 is an exploded structural schematic diagram of an embodiment of the present utility model;

[0014] Figure 3 is a raceway structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 4 is a sectional structural schematic diagram of an embodiment of the present utility model;

[0016] Figure 5 is a structural schematic diagram of the bottom of the base of an embodiment of the present utility model. Detailed Embodiment

[0017] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings: As shown in the figure, a planar linear bearing includes a base 1 and an end cover 2. The base 1 is provided with two annular arc grooves 4 for installing balls 3 and allowing the balls 3 to reciprocate. The two annular arc grooves 4 are symmetrically distributed with respect to the center of the base 1. The annular arc groove 4 includes an inner channel 5 near the inner side and an outer channel 6 near the outer side. The inner channel 5 and the outer channel 6 are connected by an inclined transition channel 7. There is a height difference between the inner channel 5 and the outer channel 6. The outer channel 6 is connected to the outside. The balls 3 located in the outer channel 6 protrude from the bottom surface of the base 1. The end cover 2 includes a first connecting portion 8 and a second connecting portion 9 corresponding to the outer channel 6 and the inner channel 5. The first connecting portion 8 is in abutting cooperation with the steel balls on the outer channel 6. There is a gap between the second connecting portion 9 and the steel balls in the inner channel 5 for their up and down movement. The base 1 is made of a special engineering plastic, which has excellent low friction and wear resistance, and at the same time has rigidity and strength comparable to that of metal.

[0018] A connection structure is provided between the base 1 and the end cover 2. The connection structure includes connectors 10 provided on both sides of the base 1 and connection holes 11 provided on the end cover 2 corresponding to the installation and connection of the connectors 10. The connector 10 includes a connecting portion 12 and an elastic interference portion 13 provided on the connecting portion 12. The diameter of the connecting portion 12 is smaller than that of the elastic interference portion 13. The elastic interference portion 13 is provided with a number of slots penetrating in the radial direction. The connection hole 11 is moved to the position of the connecting portion 12 through the deformation of the elastic interference portion 13 to form a snap connection with the base 1. Easy to install and disassemble: The design of the elastic interference portion 13 of the connector 10 makes the connector 10 more convenient to install and disassemble, without the need for additional tools or operating steps. The connector 10 is a column. A number of slots penetrating in the radial direction in the upper part of the column make the upper part of the column in an open state, with elastic deformation function, facilitating interference fit. The diameter of the upper part of the column is slightly larger than the diameter of the connection hole 11 of the end cover 2. The end cover 2 is press-fitted through the connection hole 11 so that the connection hole 11 is aligned with the connecting portion 12 to achieve snap connection and is not easily separated. A boss with a diameter slightly larger than the connection hole 11 of the end cover 2 can be provided at the lower part of the connector 10, and the boss is used to realize the fixation with the end cover 2.

[0019] A guiding inclined surface 14 distributed circumferentially is provided on the outer edge of the connecting portion 12. There is an assembly guiding inclined surface or arc surface at the upper edge, which is convenient for assembly and at the same time ensures the position after assembly without large deviation.

[0020] The end cover 2 is bent. The first connecting portion 8 and the second connecting portion 9 of the end cover 2 are connected by an inclined connecting plate 15. The connecting plate 15 is installed corresponding to the transition channel 7 of the annular arc groove 4.

[0021] The clearance between the second connecting part 9 and the steel balls in the inner channel 5 rows is 5-14 mm.

[0022] The surface roughness of the end cover 2 is less than Ra0.15, and the single-piece thickness difference of the end cover 2 is less than or equal to 0.01 mm.

[0023] The above embodiments are only one of the preferred specific embodiments of the present invention. The ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A plane linear bearing, characterized in that: It includes a base and an end cover. The base is provided with two annular arc grooves for ball installation and reciprocating motion. The two annular arc grooves are symmetrically distributed corresponding to the center of the base. The annular arc groove includes an inner channel close to the inner side and an outer channel close to the outer side. The inner channel and the outer channel are connected by an inclined transition channel. There is a height difference between the inner channel and the outer channel. The outer channel is connected to the outside. The ball located in the outer channel protrudes from the bottom surface of the base. The end cover includes a first connecting part and a second connecting part corresponding to the outer channel and the inner channel. The first connecting part abuts against the steel ball on the outer channel, and a gap is provided between the second connecting part and the steel ball in the inner channel for the up and down movement.

2. The plane linear bearing according to claim 1, characterized in that: A connecting structure is arranged between the base and the end cover, and the connecting structure includes connecting pieces arranged on both sides of the base, and connecting holes arranged on the end cover for installation and connection with corresponding connecting pieces. The connecting piece includes a connecting portion and an elastic interference portion arranged on the connecting portion. The diameter of the connecting portion is smaller than the elastic interference portion. The elastic interference portion is provided with a plurality of slots penetrating in a radial direction. The connecting hole moves to the position of the connecting portion through the deformation of the elastic interference portion to form a snap-fit ​​fit with the base.

3. The plane linear bearing according to claim 2, characterized in that: The outer edge of the connecting portion is provided with guiding inclined surfaces distributed along the circumferential direction.

4. The plane linear bearing according to claim 1, characterized in that: The end cover is bent, and the first connecting portion and the second connecting portion of the end cover are connected by an inclined connecting plate, and the connecting plate is installed in a transition groove corresponding to the annular circular arc groove.

5. The plane linear bearing according to claim 4, characterized in that: The gap between the second connecting portion and the steel balls in the inner channel row is 5-14 mm.

6. The plane linear bearing according to claim 4, characterized in that: The surface roughness of the end cover is less than Ra0.15, and the thickness difference of a single end cover is less than or equal to 0.01 mm.

Images