Thrust double-row needle bearing

Abstract

The thrust double-row needle roller bearing comprises an outer ring, an inner ring, a needle roller I and a needle roller II, the inner ring is sleeved with the outer ring, a roller path I is arranged on the inner wall of the outer ring, a roller path II is arranged on the outer wall of the inner ring, and the cross section of the roller path I and the cross section of the roller path II are complementary inverted isosceles trapezoids or regular isosceles trapezoids. The roller path I and the roller path II bear and limit the roller pin I and the roller pin II which are symmetrically and obliquely arranged, and the roller pin I is positioned above the roller pin II. The bearing is characterized in that a roller pin inlet / outlet is formed between the roller path I and the roller path II, a limiting check ring for limiting the roller pin is arranged at the roller pin inlet / outlet, and the limiting check ring is fixedly connected with the outer ring or the inner ring through a connecting screw. Compared with the prior art, the radial loading and axial loading capacity is high, the space is compact, and assembling is easy and convenient.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bearings, and particularly relates to a thrust double-row needle bearing. BACKGROUND

[0002] The needle bearing is a roller bearing with cylindrical rollers, usually composed of rollers, a retainer, and optionally an inner ring and / or an outer ring. The rollers of this type of bearing are thin and long, so the radial structure is compact, and the outer diameter is the smallest when the inner diameter size and load capacity are the same as other types of bearings, which is particularly suitable for support structures with limited radial installation size. Traditional needle bearings have good radial load capacity, compact radial space, but weak axial load capacity, wide axial space, and complex assembly. For example, the double-sealed double-row needle bearing disclosed in patent document CN111457006A has good grease sealing, but still lacks in load capacity and size compactness. In order to overcome the problems of existing needle bearings in these aspects, the technical personnel have made adjustments to some needle bearings. For example, the double-row needle bearing disclosed in patent document CN208845579U omits the inner ring, and the rollers are installed in parallel double rows on the retainer, and the outer ring covers and fixes the retainer. This bearing is simple to assemble, but its overall load capacity, especially the axial load, is still weak, and it is also slightly insufficient in space compactness. SUMMARY

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

[0004] The technical solution adopted by the present application to solve its technical problems is as follows: a thrust double-row needle bearing, comprising an outer ring, an inner ring, a roller I, and a roller II, the outer ring is sleeved on the inner ring, the inner wall of the outer ring is provided with a raceway I, the outer wall of the inner ring is provided with a raceway II, the cross sections of the raceway I and the raceway II are complementary inverted isosceles trapezoids or isosceles trapezoids, the raceway I and the raceway II carry the symmetrically inclined rollers I and rollers II, the roller I is located above the roller II, and the characteristic is that a roller inlet and outlet is arranged between the raceway I and the raceway II, a limiting stop ring for limiting the rollers is arranged at the roller inlet and outlet, and the limiting stop ring is fixedly connected with the outer ring or the inner ring through connecting screws.

[0005] Optionally, the raceway I and raceway II are located in the middle and lower part of the outer ring and the inner ring respectively, the cross section of the raceway I is a right isosceles trapezoid, the cross section of the raceway II is an inverted isosceles trapezoid, the rolling pin import and export is located in the gap between the upper part of the outer ring and the inner ring, the limiting stop ring is cut from the upper part of the outer ring, the limiting stop ring is fixedly connected with the outer ring through the connecting screw, the inner ring is cut from a circular segment as a rolling pin plug, the rolling pin plug is fixedly connected with the inner ring through the connecting screw, the gap between the upper part of the outer ring and the inner ring is provided with a sealing element, and the rolling pin I and the rolling pin II are arranged in full needle.

[0006] Optionally, the raceway I and raceway II are located in the middle and lower part of the outer ring and the inner ring respectively, the cross section of the raceway I is a right isosceles trapezoid, the cross section of the raceway II is an inverted isosceles trapezoid, the rolling pin import and export is located in the gap between the upper part of the outer ring and the inner ring, the limiting stop ring is cut from the upper part of the outer ring, the limiting stop ring is fixedly connected with the outer ring through the connecting screw, the inner ring is cut from a circular segment as a rolling pin plug, the rolling pin plug is fixedly connected with the inner ring through the connecting screw, the gap between the upper part of the outer ring and the inner ring is provided with a sealing element, and the rolling pin I and the rolling pin II are arranged in full needle.

[0007] Optionally, the raceway I and raceway II are located in the middle and lower part of the outer ring and the inner ring respectively, the cross section of the raceway I is a right isosceles trapezoid, the cross section of the raceway II is an inverted isosceles trapezoid, the rolling pin import and export is located in the gap between the upper part of the outer ring and the inner ring, the inner ring is composed of an upper inner ring and a lower inner ring, the limiting stop ring is located between the upper inner ring and the lower inner ring, and the limiting stop ring is fixedly connected with the upper inner ring and the lower inner ring through the connecting screw.

[0008] Optionally, the raceway I and raceway II are located in the middle and lower part of the outer ring and the inner ring respectively, the cross section of the raceway I is a right isosceles trapezoid, the cross section of the raceway II is an inverted isosceles trapezoid, the rolling pin import and export is located in the gap between the upper part of the outer ring and the inner ring, the limiting stop ring is cut from the upper part of the outer ring, the limiting stop ring is fixedly connected with the outer ring through the connecting screw, the inner ring is cut from a circular segment as a rolling pin plug, the rolling pin plug is fixedly connected with the inner ring through the connecting screw, the gap between the upper part of the outer ring and the inner ring is provided with a sealing element, and the rolling pin I and the rolling pin II are arranged in full needle.

[0009] The principle and assembly mode of the application: the application is based on the needle bearing, learns from the characteristics of the thrust needle bearing, slightly shortens the length of the needle, and arranges the needle (the needle I and the needle II) in two rows of inclined symmetrical forms between the inner and outer rings of the bearing, the raceway (the raceway I and the raceway II) carries and limits the two rows of needles, through such design, the bearing has strong radial load and axial load capacity, and is compact in space; in addition, the rolling pin import and export is arranged at the cavity for covering and limiting the needle formed by the raceway, through the rolling pin import and export, under the alternating limiting action of the inner and outer rings (the alternating inclined rolling surface formed by the inverted isosceles trapezoidal recess and the right isosceles trapezoidal protrusion on the side wall) and the limiting stop ring, the needle is sequentially loaded into the raceway, then the outer ring, the inner ring or the limiting stop ring is locked by using the connecting screw, the assembly of the bearing is completed, the whole assembly process is simple, and the disassembly can also be quickly completed by removing the connecting screw, so that the bearing is easy to maintain.

[0010] Compared with the prior art, the present application has at least the following technical effects: the present application has strong radial load and axial load capacity, is compact in space, and is simple to assemble. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic diagram of a cross-sectional structure of a form one of the present application; Figure 2 is a schematic diagram of a cross-sectional structure of a form two of the present application; Figure 3 is a schematic diagram of a cross-sectional structure of a form three of the present application; Figure 4 is a schematic diagram of a cross-sectional structure of a form four of the present application; The markers in the drawings are described as follows: 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 and outlet 7, needle roller block 9. DETAILED DESCRIPTION

[0012] The specific embodiments of the present application are described below, but the embodiments are merely illustrative of the present application and are not limiting.

[0013] REFERENCE Figures 1-4 In the present embodiment, the thrust double-row needle roller bearing includes an outer ring 1, an inner ring 2, a needle roller I 3, and a needle roller II 4. The outer ring is sleeved on the inner ring. An inner wall of the outer ring is provided with a raceway I 5, and an outer wall of the inner ring is provided with a raceway II 6. The raceway I and the raceway II are complementary inverted isosceles trapezoids or isosceles trapezoids in cross section. The raceway I and the raceway II carry the symmetrically inclined needle roller I and the needle roller II through the inclined rolling surfaces thereof and the limiting stop blocks provided at the ends of the rolling surfaces. In addition, the ends of the raceways are provided with oil storage grooves for storing lubricating oil. The oil storage grooves enable the bearing to have a certain oil storage capacity under the blocking of the needle rollers. The needle roller I is located above the needle roller II. The raceway I and the raceway II are provided with a needle roller inlet and outlet 7 therebetween. A limiting stop ring 8 for limiting the needle rollers is provided at the needle roller inlet and outlet. The limiting stop ring is fixedly connected with the outer ring or the inner ring through connecting screws.

[0014] In the present embodiment, as Figure 1As shown, in order to obtain better bearing stiffness, make the bearing rotation accuracy not affected by installation factors, the inner and outer rings are of integral structure, the raceway I and raceway II are located at the middle and lower parts of the outer ring and inner ring respectively, the raceway I cross section is a right isosceles trapezoid, the raceway II cross section is an inverted isosceles trapezoid, the needle roller inlet and outlet are located in the gap between the upper part of the outer ring and the inner ring, the limiting stop ring is segmented from the upper part of the outer ring, the limiting stop ring is fixedly connected with the outer ring through connecting screws, the inner ring lower part is segmented a circular arc segment as the needle roller plug 9, the needle roller plug is fixedly connected with the inner ring through connecting screws, the gap between the upper part of the outer ring and the inner ring is provided with a sealing element, the needle roller I and needle roller II are arranged in full needle. The assembly sequence of the bearing of this form is: the outer ring and the inner ring are coaxially sleeved, the needle roller I is filled into the raceway through the needle roller inlet and outlet between the outer ring and the inner ring above the bearing, the limiting stop ring is fixed through connecting screws to limit the needle roller I, the needle roller II inlet is below the bearing, the needle roller plug below the bearing is removed, the needle roller II is filled into the raceway through the inlet, the needle roller plug is fixed through connecting screws to close the inlet, that is, the bearing assembly is completed.

[0015] In the present embodiment, as shown in Figure 2 In order to obtain better bearing stiffness, make the bearing rotation accuracy not affected by installation factors, and have better load capacity (compared with the bearing of the form Figure 1 The inner and outer rings are of integral structure, the raceway I and raceway II are located at the middle and lower parts of the outer ring and inner ring respectively, the raceway I cross section is an inverted isosceles trapezoid, the raceway II cross section is a right 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 stop ring is segmented from the lower part of the inner ring, the limiting stop ring is fixedly connected with the outer ring through connecting screws, the upper part of the outer ring is segmented a circular arc segment as the needle roller plug, the needle roller plug is fixedly connected with the inner ring through connecting screws, the gap between the upper part of the outer ring and the inner ring is provided with a sealing element, the needle roller I and needle roller II are arranged in full needle. The assembly sequence of the bearing of this form is: the outer ring and the inner ring are coaxially sleeved, the needle roller I inlet is above the bearing, the needle roller plug above the bearing is removed, the needle roller I is filled into the raceway through the inlet, the needle roller plug is fixed through connecting screws to close the inlet, the needle roller II is filled into the raceway through the needle roller inlet and outlet between the outer ring and the inner ring below the bearing, the limiting stop ring is fixed through connecting screws to limit the needle roller II, that is, the bearing assembly is completed.

[0016] In the present embodiment, as shown in 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.

[0017] 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.

[0018] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of this embodiment in any way. Any person skilled in the art can make many possible variations and modifications to the present invention using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the present invention; all such modifications shall still fall within the protection scope of the present invention.

Claims

1. A thrust double-row needle roller bearing, comprising an outer ring (1), an inner ring (2), needle roller I (3) and needle roller II (4), wherein the outer ring is fitted onto the inner ring, raceway I (5) is provided on the inner wall of the outer ring, and raceway II (6) is provided 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 bear and limit the symmetrically inclined needle rollers I and II. The needle roller I is located above the needle roller II. The feature is that a needle roller inlet and outlet (7) is provided between raceway I and raceway II. A limiting retaining ring (8) is provided at the needle roller inlet and outlet to limit the needle roller. The limiting retaining ring is fixedly connected to the outer ring or inner ring by connecting screws.

2. The thrust double-row needle roller bearing according to claim 1, characterized in that: 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 needle roller bearing according to claim 1, characterized in that: 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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