Thrust double row needle roller bearing

Abstract

This utility model discloses a thrust double-row needle roller bearing, including an outer ring, an inner ring, needle rollers I and II. The outer ring is fitted onto the inner ring. Raceway I is provided on the inner wall of the outer ring, and raceway II is provided on the outer wall of the inner ring. The cross-sections of raceway I and raceway II are complementary inverted isosceles trapezoids or regular isosceles trapezoids. Raceway I and raceway II bear and limit the symmetrically inclined needle rollers I and II, with needle roller I located above needle roller II. The bearing is characterized by a needle roller inlet and outlet between raceway I and raceway II, with limiting retaining rings at the inlet and outlet to limit the needle rollers. The limiting retaining rings are fixedly connected to the outer ring or inner ring by connecting screws. Compared with the prior art, this utility model has stronger radial and axial load capabilities, and is compact and easy to assemble.

Description

Technical Field

[0001] This utility model belongs to the field of bearings, specifically relating to thrust double-row needle roller bearings. Background Technology

[0002] Needle roller bearings are roller bearings with cylindrical rollers, typically consisting of needle rollers, a cage, and an optional inner and / or outer ring. These bearings have thin and long rollers, resulting in a compact radial structure. With the same inner diameter and load capacity as other types of bearings, they have the smallest outer diameter, making them particularly suitable for support structures where radial installation space is limited. Traditional needle roller bearings have good radial load capacity and compact radial space, but their axial load capacity is weak, their axial space is large, and their assembly is relatively cumbersome. For example, the double-sealed double-row needle roller bearing disclosed in patent document CN111457006A, while having good grease sealing, is slightly lacking in load capacity and compact size. To overcome these problems of existing needle roller bearings, technicians have made adjustments to some needle roller bearings. For example, the double-row needle roller bearing disclosed in patent document CN208845579U omits the inner ring, and the needle rollers are mounted on the cage in a parallel double row. The outer ring covers and fixes the cage. This bearing is relatively easy to assemble, but its overall load capacity, especially the axial load, is still relatively weak, and it is also slightly insufficient in terms of space. Utility Model Content

[0003] The purpose of this invention is to overcome the problems of existing needle roller bearings in terms of assembly, load and space occupation, and to provide a thrust double row needle roller bearing with strong radial and axial load capacity, compact space and simple assembly.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a thrust double-row needle roller bearing, including an outer ring, an inner ring, needle roller I and needle roller II, the outer ring being sleeved on the inner ring, a raceway I being provided on the inner wall of the outer ring, and a raceway II being provided on the outer wall of the inner ring, the cross-sections of raceway I and raceway II being complementary inverted isosceles trapezoids or regular isosceles trapezoids, raceway I and raceway II bearing and limiting symmetrically inclined needle rollers I and needle roller II, needle roller I being located above needle roller II, characterized in that: a needle roller inlet and outlet are provided between raceway I and raceway II, and a limiting retaining ring is provided at the needle roller inlet and outlet to limit the needle rollers, the limiting retaining ring being fixedly connected to the outer ring or inner ring by connecting screws.

[0005] Optionally, raceway I and raceway II are located in the lower middle part of the outer ring and inner ring, respectively. The cross-section of raceway I is a regular isosceles trapezoid, and the cross-section of raceway II is an inverted isosceles trapezoid. The needle roller inlet and outlet are located in the upper gap between the outer ring and the inner ring. The limiting retaining ring is cut from the upper part of the outer ring and is fixedly connected to the outer ring by connecting screws. A section of arc is cut from the lower part of the inner ring as a needle roller plug. The needle roller plug is fixedly connected to the inner ring by connecting screws. A sealing element is provided in the upper gap between the outer ring and the inner ring. The needle rollers I and II are fully arranged.

[0006] Optionally, raceway I and raceway II are located in the lower middle part of the outer ring and inner ring, respectively. The cross-section of raceway I is an inverted isosceles trapezoid, and the cross-section of raceway II is a regular isosceles trapezoid. The needle roller inlet and outlet are located at the lower gap between the outer ring and the inner ring. The limiting retaining ring is cut from the lower part of the inner ring and is fixedly connected to the outer ring by connecting screws. A circular arc segment is cut from the upper part of the outer ring as a needle roller plug. The needle roller plug is fixedly connected to the inner ring by connecting screws. A sealing element is provided in the gap between the outer ring and the upper part of the inner ring. The needle rollers I and II are fully arranged.

[0007] Optionally, raceway I and raceway II are located in the middle of the outer ring and the inner ring, respectively. Raceway I has a cross-section of a regular isosceles trapezoid, and raceway II has a cross-section of an inverted isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the outer ring and the inner ring. The inner ring consists of an upper inner ring and a lower inner ring. A limiting retaining ring is located between the upper inner ring and the lower inner ring. The limiting retaining ring is fixedly connected to the upper inner ring and the lower inner ring by connecting screws.

[0008] Optionally, raceway I and raceway II are located in the middle of the outer ring and the inner ring, respectively. The cross-section of raceway I is an inverted isosceles trapezoid, and the cross-section of raceway II is a regular isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the outer ring and the inner ring. The outer ring consists of an upper outer ring and a lower outer ring. The limiting ring is located between the upper outer ring and the lower outer ring. The upper outer ring and the lower outer ring are fixedly connected by connecting screws.

[0009] The principle and assembly method of this utility model: This utility model is based on needle roller bearings and draws on the characteristics of thrust needle roller bearings. The length of the needle rollers is slightly shortened, and the needle rollers (needle roller I and needle roller II) are arranged in two rows of inclined symmetrical arrangement between the inner and outer rings of the bearing. The raceway (raceway I and raceway II) carries and limits the two rows of needle rollers. Through this design, the bearing has strong radial and axial load capacity and is compact in space. In addition, a needle roller inlet and outlet are opened at the cavity formed by the raceway that covers and limits the needle rollers. Through the needle roller inlet and outlet, under the alternating limiting action of the inner and outer rings (the inverted isosceles trapezoidal recesses and regular isosceles trapezoidal protrusions on the side walls form alternating inclined rolling surfaces) and the limiting retaining ring, the needle rollers are sequentially installed into the raceway. Then, the outer ring, inner ring or limiting retaining ring is locked with connecting screws to complete the assembly of the bearing. The entire assembly process is simple, and subsequent disassembly can be quickly completed by removing the connecting screws, making it easy to maintain.

[0010] Compared with the prior art, the present invention has at least the following technical effects: the present invention has strong radial and axial load capacity, and is compact and easy to assemble. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram of Form 1 of the present utility model;

[0012] Figure 2 This is a cross-sectional structural diagram of the second form of the present utility model;

[0013] Figure 3 This is a cross-sectional structural diagram of Form 3 of the present utility model;

[0014] Figure 4 This is a cross-sectional structural diagram of form four of the present utility model;

[0015] The following are the detailed markings in the attached diagram: outer ring 1, upper outer ring 1-1, lower outer ring 1-2, inner ring 2, upper inner ring 2-1, lower inner ring 2-2, needle roller I 3, needle roller II 4, raceway I 5, raceway II 6, needle roller inlet / outlet 7, needle roller block 9. Detailed Implementation

[0016] The specific embodiments of this utility model are described below, but the embodiments are merely illustrative and not limiting.

[0017] refer to Figure 1-4 In this embodiment, the thrust double-row needle roller bearing includes an outer ring 1, an inner ring 2, needle rollers I 3 and needle rollers II 4. The outer ring is fitted onto the inner ring. The inner wall of the outer ring is provided with raceway I 5, and the outer wall of the inner ring is provided with raceway II 6. The cross-sections of raceway I and raceway II are complementary inverted isosceles trapezoids or regular isosceles trapezoids. Raceway I and raceway II support and limit the symmetrically inclined needle rollers I and II through their inclined rolling surfaces and the limiting blocks provided at the ends of the rolling surfaces. In addition, the ends of the raceways are also provided with oil storage grooves for storing lubricating oil. The oil storage grooves are blocked by the needle rollers, so that the bearing has a certain grease storage capacity. Needle roller I is located above needle roller II. There is a needle roller inlet and outlet 7 between raceway I and raceway II. There are limiting retaining rings 8 at the needle roller inlet and outlet to limit the needle rollers. The limiting retaining rings are fixedly connected to the outer ring or the inner ring by connecting screws.

[0018] In this embodiment, as Figure 1As shown, in order to obtain better bearing rigidity and ensure that the bearing rotation accuracy is not affected by installation factors, both the inner and outer rings adopt an integral structure, with raceway I and raceway II located in the lower middle part of the outer and inner rings, respectively. The cross-section of raceway I is a regular isosceles trapezoid, and the cross-section of raceway II is an inverted isosceles trapezoid. The needle roller inlet and outlet are located in the upper gap between the outer and inner rings. The limiting retaining ring is cut from the upper part of the outer ring and is fixedly connected to the outer ring by connecting screws. A section of arc is cut from the lower part of the inner ring as a needle roller plug 9, which is fixedly connected to the inner ring by connecting screws. A sealing element is provided in the upper gap between the outer and inner rings. Needle rollers I and II are fully arranged. The assembly sequence for this type of bearing is as follows: the outer ring and inner ring are coaxially fitted together. Needle roller I is filled into the raceway through the needle roller inlet and outlet between the outer and inner rings on the bearing. The limit retaining ring is fixed in place with connecting screws to limit needle roller I. The needle roller II inlet is located at the bottom of the bearing. The needle roller plug at the bottom of the bearing is removed, and needle roller II is filled into the raceway through this inlet. The needle roller plug is then fixed in place with connecting screws to close the inlet. This completes the bearing assembly.

[0019] In this embodiment, as Figure 2 As shown, in order to obtain better bearing stiffness, ensure that the bearing rotational accuracy is not affected by installation factors, and possess better load capacity (compared to) Figure 1 The bearing is of the form of an integral structure for both the inner and outer rings. Raceways I and II are located in the lower middle part of the outer and inner rings, respectively. The cross-section of raceway I is an inverted isosceles trapezoid, and the cross-section of raceway II is a regular isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the lower part of the outer and inner rings. The limiting retaining ring is cut from the lower part of the inner ring and is fixedly connected to the outer ring by connecting screws. A circular arc segment is cut from the upper part of the outer ring as a needle roller plug, which is fixedly connected to the inner ring by connecting screws. A seal is provided in the gap between the upper part of the outer and inner rings. Needle rollers I and II are arranged in full needle configuration. The assembly sequence for this type of bearing is as follows: the outer ring and inner ring are coaxially fitted together, the needle roller I inlet is on the bearing, the needle roller plug on the bearing is removed, and the needle roller I is filled into the raceway through this inlet. The needle roller plug is then fixed in place with connecting screws to close the inlet. The needle roller II is filled into the raceway through the needle roller inlet between the outer ring and inner ring on the underside of the bearing. The limit retaining ring is then fixed in place with connecting screws to limit the needle roller II. This completes the bearing assembly.

[0020] In this embodiment, as Figure 3As shown, to allow users to adjust the bearing preload during installation and use, the outer ring is integral, while the inner ring is a split structure. Raceway I and raceway II are located in the middle of the outer and inner rings, respectively. Raceway I has a cross-section of a regular isosceles trapezoid, and raceway II has a cross-section of an inverted isosceles trapezoid. The needle roller inlet and outlet are located at the gap between the outer and inner rings. The inner ring consists of an upper inner ring 2-1 and a lower inner ring 2-2. A retaining ring is located between the upper and lower inner rings and is fixedly connected to the upper and lower inner rings by connecting screws. The assembly sequence for this type of bearing is as follows: the outer ring and lower inner ring are coaxially fitted together. Needle roller II is inserted into the raceway through the needle roller inlet and outlet. The retaining ring is installed at the needle roller inlet and outlet and fixedly connected to the lower inner ring by connecting screws. The retaining ring limits needle roller II. Next, needle roller I is inserted into the raceway. The upper outer ring is installed on the retaining ring and fixedly connected by connecting screws. The upper outer ring limits needle roller I, thus completing the bearing assembly.

[0021] In this embodiment, as Figure 4 As shown, this design allows users to adjust the bearing preload during installation and use, while also providing good load capacity (compared to...). Figure 3 This bearing (of this type) has a split outer ring and an integral inner ring. Raceways I and II are located in the middle of the outer and inner rings, respectively. Raceway I has an inverted isosceles trapezoidal cross-section, and raceway II has a regular isosceles trapezoidal cross-section. The needle roller inlet and outlet are located in the gap between the outer and inner rings. The outer ring consists of an upper outer ring 1-1 and a lower outer ring 1-2. A retaining ring is located between the upper and lower outer rings, which are fixedly connected by connecting screws. The assembly sequence of this bearing is as follows: the inner ring and lower outer ring are coaxially fitted together; needle roller II is inserted into the raceway through the needle roller inlet and outlet; a retaining ring is installed at the needle roller inlet and outlet to limit needle roller II; next, needle roller I is inserted into the raceway; the upper outer ring is installed on the retaining ring and fixed to the lower outer ring by connecting screws; the upper outer ring limits the retaining ring and needle roller I, thus completing the bearing assembly.

[0022] The above description is merely a preferred embodiment of this utility model and is not intended to limit this embodiment in any way. Any person skilled in the art can make many possible variations and modifications to this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model; all such modifications shall still fall within the protection scope of this utility model.

Claims

1. A double-row thrust needle bearing, comprising an outer ring (1), an inner ring (2), needle rollers I (3) and needle rollers II (4), the outer ring being sleeved on the inner ring, a raceway I (5) being arranged on the inner wall of the outer ring, and a raceway II (6) being arranged on the outer wall of the inner ring, characterized in that: The cross sections of raceway I and raceway II are complementary inverted isosceles trapezoids or regular isosceles trapezoids. Raceway I and raceway II support and limit the symmetrically inclined needle rollers I and II. Needle roller I is located above needle roller II. There is a needle roller inlet and outlet (7) between raceway I and raceway II. There is a limiting retaining ring (8) at the needle roller inlet and outlet to limit the needle rollers. The limiting retaining ring is fixedly connected to the outer ring or inner ring by connecting screws.

2. The thrust double-row roller bearing of claim 1, wherein: Raceway I and raceway II are located in the lower middle part of the outer ring and the inner ring, respectively. The cross-section of raceway I is a regular isosceles trapezoid, and the cross-section of raceway II is an inverted isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the outer ring and the upper part of the inner ring. The limiting retaining ring is cut from the upper part of the outer ring and is fixedly connected to the outer ring by connecting screws. A section of arc is cut from the lower part of the inner ring as a needle roller plug (9). The needle roller plug is fixedly connected to the inner ring by connecting screws. A sealing element (10) is provided in the gap between the outer ring and the upper part of the inner ring. The needle rollers I and II are fully arranged.

3. The thrust double-row roller bearing of claim 1, wherein: Raceway I and raceway II are located in the lower middle part of the outer ring and inner ring, respectively. The cross-section of raceway I is an inverted isosceles trapezoid, and the cross-section of raceway II is a regular isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the lower part of the outer ring and the inner ring. The limiting retaining ring is cut from the lower part of the inner ring and is fixedly connected to the outer ring by connecting screws. A section of arc is cut from the upper part of the outer ring as a needle roller plug. The needle roller plug is fixedly connected to the inner ring by connecting screws. A sealing element is provided in the gap between the upper part of the outer ring and the inner ring. The needle rollers I and II are fully arranged.

4. The thrust double-row needle roller bearing according to claim 1, characterized in that: Raceway I and raceway II are located in the middle of the outer ring and the inner ring, respectively. The cross-section of raceway I is a regular isosceles trapezoid, and the cross-section of raceway II is an inverted isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the outer ring and the inner ring. The inner ring consists of an upper inner ring (2-1) and a lower inner ring (2-2). The limiting retaining ring is located between the upper inner ring and the lower inner ring. The limiting retaining ring is fixedly connected to the upper inner ring and the lower inner ring by connecting screws.

5. The thrust double-row needle roller bearing according to claim 1, characterized in that: Raceway I and raceway II are located in the middle of the outer ring and the inner ring, respectively. The cross-section of raceway I is an inverted isosceles trapezoid, and the cross-section of raceway II is a regular isosceles trapezoid. The needle roller inlet and outlet are located in the gap between the outer ring and the inner ring. The outer ring consists of an upper outer ring (1-1) and a lower outer ring (1-2). The limiting ring is located between the upper outer ring and the lower outer ring. The upper outer ring and the lower outer ring are fixedly connected by connecting screws.

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