Needle roller type plane bearing

Abstract

The utility model discloses a roller pin type plane bearing which comprises a roller pin retainer and bearing contact pieces, the roller pin retainer and the bearing contact pieces are of circular ring structures, a plurality of roller pin holes are evenly distributed in the circumferential direction of the roller pin retainer, roller pins are installed in the roller pin holes, and the bearing contact pieces and the roller pin retainer are coaxial and installed on the two sides of the roller pin retainer respectively. The bearing contact piece covers and abuts against the roller pin, the bearing contact piece is connected with the roller pin in a rolling mode so that the bearing contact piece can be connected with the roller pin retainer in a rotating mode, and the overall flatness of the plane bearing is smaller than or equal to 0.02 mm. When the weaving machine runs at a high speed, the running stability of the heald frame can be maintained to the maximum extent, the service life of the connecting rod group blade and the plane bearing is prolonged, the weaving efficiency of the weaving machine is improved, and the stopping rate and the cloth defects are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of textile machinery, and more specifically, to a needle roller type plain bearing. Background Art

[0002] With the increase of the speed of domestic weaving machines and the diversification of fabrics, the connecting rods supporting the loom shedding boxes must also meet the requirements of high speed.

[0003] Meanwhile, as shown in the existing ball type plain bearing Figure 1 which includes an upper bearing cover 4, steel balls 5, a ball cage 7 and a lower bearing cover 6. The steel balls 5 are circumferentially distributed on the edge of the ball cage 7, and the ball cage 7 is installed between the upper bearing cover 4 and the lower bearing cover 6. Due to the buckling of the upper bearing cover 4 and the lower bearing cover 6 and the forming of the installation positions of the steel balls 5, the error of the ball type plain bearing is relatively large. The eccentricity caused by this error makes the loom heddle frame extremely likely to swing back and forth during the high-speed reciprocating motion up and down, and the connecting rod blade and the plain bearing are worn due to the impact of long-term lateral force, resulting in relative displacement and damage to the connecting rod assembly. These accidents seriously affect the improvement of the loom speed, the service life of the connecting rod, and increase the daily maintenance cost of the loom.

[0004] Therefore, a new solution is needed to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a needle roller type plain bearing.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A needle roller type plain bearing includes a needle cage and bearing contacts. Both the needle cage and the bearing contacts are of circular ring structure. A number of needle holes are circumferentially distributed on the needle cage, and needle rollers are installed in the needle holes. The bearing contacts are coaxial with the needle cage and are respectively installed on both sides of the needle cage. The bearing contacts cover and abut against the needle rollers, and the bearing contacts are in rolling connection with the needle rollers so that the bearing contacts and the needle cage are rotationally connected. The overall flatness of the plain bearing ≤ 0.02 mm.

[0008] Further, the flatness of the bearing contacts ≤ 0.01 mm, and the thickness of the bearing contacts is 1.5 ± 0.01 mm.

[0009] Further, the total thickness of the plain bearing is 6.0 ± 0.02 mm.

[0010] Furthermore, both sides of the protection frame are provided with an annular mounting groove which is coaxial with the protection frame, the mounting groove corresponds to and is connected with the needle roller hole, and the bearing contact piece is rotatably connected to the mounting groove.

[0011] Furthermore, the cross section of the portion of the bearing contact piece located in the mounting groove is trapezoidal, and protrusions extending into the groove are provided on both sides of the mounting groove. The protrusions are annular and have a trapezoidal cross section.

[0012] Furthermore, the needle roller cage is a nylon needle roller cage.

[0013] The beneficial effects of the utility model are:

[0014] 1. When the loom is running at high speed, the utility model can maintain the stability of the heald frame operation to the maximum extent, and improve the service life of the connecting rod group blades and plane bearings, thereby improving the weaving efficiency of the loom and reducing the downtime rate and cloth defects.

[0015] 2. In the present invention, a mounting groove is provided so that the bearing contact piece can be installed on the needle roller cage and rotatably connected to the needle roller cage. The protrusion is provided to, firstly, limit the bearing contact piece to prevent the bearing contact piece from disengaging from the mounting groove when the loom is running at high speed. Secondly, the protrusion and the needle roller cage are integrated and made of nylon 66, which has a certain deformation ability, so that the bearing contact piece can be easily installed in the mounting groove. Thirdly, the wide end of the protrusion is connected to the mounting groove to improve the connection strength between the protrusion and the mounting groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a cross-sectional structure of an existing ball-type plane bearing;

[0017] Figure 2 Schematic diagram of the structure of a needle roller type plane bearing in this embodiment;

[0018] Figure 3 This is a schematic cross-sectional view of a needle roller type plane bearing in this embodiment;

[0019] Figure 4 Schematic diagram of the structure of the needle roller cage in this embodiment;

[0020] Figure 5 Schematic diagram of a cross-sectional structure of the needle roller cage in this embodiment;

[0021] Figure 6 This is a structural schematic diagram of a bearing contact piece in this embodiment;

[0022] Figure 7 Schematic diagram of a cross-sectional structure of a bearing contact piece in this embodiment;

[0023] Figure 8 This is a schematic structural diagram of a needle roller in this embodiment.

[0024] Reference numerals: Needle roller cage 1, needle roller holes 101, mounting grooves 102, protrusions 103, bearing contact pieces 2, needle rollers 3, upper bearing cover 4, steel balls, upper bearing cover 6, ball cage 7. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment: A needle roller type plain bearing, as Figures 2 - 8 shown, includes a needle roller cage 1 and bearing contact pieces 2. Both the needle roller cage 1 and the bearing contact pieces 2 are of circular ring structure. A plurality of needle roller holes 101 are evenly distributed circumferentially on the needle roller cage 1. Needle rollers 3 are installed in the needle roller holes 101. There are two bearing contact pieces 2, which are coaxially arranged with the needle roller cage 1 and are respectively installed on both sides of the needle roller cage 1. The bearing contact pieces 2 cover and abut against all the needle rollers 3 installed in the needle roller holes 101. The bearing contact pieces 2 are in rolling connection with the needle rollers 3 so that the bearing contact pieces 2 and the needle roller cage 1 are rotationally connected.

[0027] Among them, the needle roller cage 1 is made of nylon 66 material. Nylon 66 has the characteristics of high mechanical strength, high rigidity and light weight, which improves the rigidity and service life of the needle roller cage 1, thereby improving the service life of the plain bearing, improving the weaving efficiency of the loom, reducing the stop rate and fabric defects; the thickness of the outer part (i.e., the edge of the needle roller cage 1) of the needle roller cage 1 located outside the needle roller holes 101 is 5.0 ± 0.01 mm, and the thickness of the inner part (i.e., the middle part of the needle roller cage 1) of the needle roller cage 1 located inside the needle roller holes 101 is 5.5 ± 0.01 mm; the height of the needle roller holes 101 is less than the diameter of the needle rollers 3 so that when the bearing contact pieces 2 are installed in the mounting grooves 102 of the needle roller cage 1, the inner side surfaces of the bearing contact pieces 2 abut against the needle rollers 3. The needle rollers 3 are made of GCr15 material.

[0028] The bearing contact pieces 2 are made of GCr15 or 1Gr18Ni9Ti material, carburized and quenched, and the hardness is HRc50 - 56; the thickness of the bearing contact pieces 2 is 1.5 ± 0.01 mm, and the flatness of the bearing contact pieces 2 ≤ 0.01 mm.

[0029] After the two bearing contact pieces 2 are installed on both sides of the needle roller cage 1, a plain bearing is formed. The total thickness of the plain bearing is 6.0 ± 0.02 mm, and the overall flatness ≤ 0.02 mm.

[0030] The needle roller type plain bearing adopts the above design. Compared with the ball type plain bearing, first, the force-bearing area between it and the blade plane is increased, and the contact force-bearing surface is changed from a circular line to a circular surface. When the connecting rod runs at high speed, the running stability between the connecting rod and the blade is improved, and the influence of the friction between the blades on its motion performance is reduced; second, the thickness of the bearing contact piece 2 is increased to meet the requirements of rigidity and wear resistance during high-speed operation; third, by controlling the flatness and the total thickness, the accuracy of the plain bearing is improved. When the loom runs at high speed, the smoothness of the heddle frame operation can be maintained to the greatest extent, the service life of the connecting rod group blade and the plain bearing is extended, and thus the weaving efficiency of the loom is improved, and the stop rate and fabric defects are reduced.

[0031] When using a ball type plain bearing (total thickness of 6.0 ± 0.04 mm), the loom speed supported by the connecting rod: for the air-jet connecting rod, it is below 550 r / min, and for the rapier, it is below 500 r / min; when using a needle roller type plain bearing (total thickness of 6.0 ± 0.02 mm), the loom speed supported by the connecting rod: for the air-jet connecting rod, it is above 900 r / min, and for the rapier, it is above 650 r / min for stable operation, and the average life of the connecting rod is increased from the original 1.5 years to 2.5 years.

[0032] Furthermore, as Figure 4 and Figure 5 shown, annular mounting grooves 102 coaxial with the needle roller cage 1 are respectively formed on both sides of the needle roller cage 1. The mounting grooves 102 correspond to and communicate with the needle holes 101, and the bearing contact piece 2 is rotatably connected to the mounting grooves 102. By providing the mounting grooves 102, it is convenient for the bearing contact piece 2 to be mounted on the needle roller cage 1; by rotatably connecting the bearing contact piece 2 to the mounting grooves 102, the bearing contact piece 2 and the needle roller cage 1 are rotatably connected.

[0033] As Figure 6 and Figure 7 shown, the cross-section of the part of the bearing contact piece 2 located in the mounting groove 102 is trapezoidal. Protrusions 103 extending into the groove opening are provided on both sides of the groove opening of the mounting groove 102. The protrusions 103 are annular and their cross-section is trapezoidal. By providing the protrusions 103, first, the bearing contact piece 2 is limited to prevent the bearing contact piece 2 from disengaging from the mounting groove 102 during the high-speed operation of the loom; second, the protrusions 103 and the needle roller cage 1 are integrally formed and made of nylon 66 material, which has a certain deformation ability to facilitate the installation of the bearing contact piece 2 in the mounting groove 102; third, the wide ends of the protrusions 103 are connected to the mounting groove 102 to improve the connection strength between the protrusions 103 and the mounting groove 102.

[0034] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. A needle roller type plain bearing, comprising a needle roller cage (1) and a bearing contact piece (2), characterized in that, The needle cage (1) and the bearing contact piece (2) are both of circular ring structures. A plurality of needle holes (101) are circumferentially and uniformly distributed on the needle cage (1). Needles (3) are installed in the needle holes (101). The bearing contact piece (2) is coaxial with the needle cage (1) and is respectively installed on both sides of the needle cage (1). The bearing contact piece (2) covers and abuts against the needles (3). The bearing contact piece (2) is in rolling connection with the needles (3) so that the bearing contact piece (2) and the needle cage (1) are rotationally connected. The overall flatness of the plain bearing is ≤0.02 mm.

2. A needle roller type plain bearing according to claim 1, characterized in that, The flatness of the bearing contact piece (2) is ≤0.01 mm, and the thickness of the bearing contact piece (2) is 1.5 ± 0.01 mm.

3. A needle roller type plain bearing according to claim 1, characterized in that, The total thickness of the plain bearing is 6.0 ± 0.02 mm.

4. A needle roller type plain bearing according to claim 1, characterized in that, Installation grooves (102) which are coaxial with the protective cage and are annular are respectively formed on both sides of the protective cage. The installation grooves (102) correspond to and communicate with the needle holes (101). The bearing contact piece (2) is rotationally connected to the installation grooves (102).

5. A needle roller plain bearing according to claim 4, characterized in that, The cross section of the part of the bearing contact piece (2) located in the installation groove (102) is trapezoidal. Protrusions (103) extending into the notch of the installation groove (102) are arranged on both sides of the notch of the installation groove (102). The protrusions (103) are annular and their cross sections are trapezoidal.

6. The needle roller type plain bearing according to claim 1, wherein, The needle cage (1) is a nylon needle cage.

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