Sealing tapered roller bearing for agricultural machinery

Abstract

A sealed tapered roller bearing for agricultural machinery relates to the technical field of bearings. The utility model relates to a single-row tapered roller bearing, and aims to solve the problems that the existing single-row tapered roller bearing is difficult to mount and seal due to structural characteristics, especially at special positions of agricultural machinery, the sealing performance of the bearing is poor, and the bearing is arranged at the edge of equipment, so that the internal pollution of the bearing is serious. The section of the bearing inner ring 5 is in a circular truncated cone shape, a channel is machined in the outer surface of the bearing inner ring 5 in the circumferential direction, a center hole of the bearing outer ring 4 is a conical hole, the bearing inner ring 5 is sleeved with the bearing outer ring 4, a retainer 7 is arranged between the inner wall of the bearing outer ring 4 and the outer surface of the bearing inner ring 5, and a plurality of tapered rollers 6 are arranged on the retainer 7. The tapered roller 6 is arranged in a channel on the outer surface of the bearing inner ring 5, a positioning shoulder is machined at an inner hole of the large-diameter end face of the bearing inner ring 5, and a positioning boss on the end face of the sealing cover 8 is connected with the positioning shoulder in the inner hole of the large-diameter end of the bearing inner ring 5 in a matched mode. The utility model is suitable for the technical field of agricultural machinery.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a sealed tapered roller bearing for agricultural machinery. Background Art

[0002] At present, general-purpose bearings for agricultural machinery mainly include standard deep groove ball bearings and sealed bearings, cylindrical roller bearings, single and double row angular contact ball bearings, self-aligning ball bearings, self-aligning roller bearings, single and double row tapered roller bearings. These general-purpose bearings are widely used in the working systems and transmission systems of combine harvesters, disc harrows, mowers, tractors, and seeders.

[0003] Agricultural machinery works in the field, the environment is harsh, and the requirements for the sealing of agricultural machinery bearings are high. Most of them adopt double sealing structure, and the sealing effect is tested by paint penetration test.

[0004] However, existing single-row tapered roller bearings are difficult to install and seal due to their structural characteristics, especially in special locations of agricultural machinery. Since the sealing of the bearings is poor and the bearings are at the edge of the equipment, there is a serious problem of internal contamination of the bearings. Utility Model Content

[0005] The utility model proposes a sealed tapered roller bearing for agricultural machinery to solve the problem that the existing single-row tapered roller bearing is difficult to install and seal due to its structural characteristics, especially in special positions of agricultural machinery, the sealing of the bearing is poor and the bearing is at the edge of the equipment, which leads to serious contamination inside the bearing.

[0006] The utility model is a sealed tapered roller bearing for agricultural machinery, which comprises a bearing outer ring 4, a bearing inner ring 5, a tapered roller 6, a retaining frame 7 and a sealing cover 8;

[0007] The cross section of the bearing inner ring 5 is truncated cone-shaped, and the outer surface of the bearing inner ring 5 is processed with a channel in the circumferential direction. The center hole of the bearing outer ring 4 is a tapered hole. The bearing outer ring 4 is sleeved on the bearing inner ring 5. A retainer 7 is provided between the inner wall of the bearing outer ring 4 and the outer surface of the bearing inner ring 5. A plurality of tapered rollers 6 are provided on the retainer 7, and the tapered rollers 6 are arranged inside the channel on the outer surface of the bearing inner ring 5. A positioning shoulder is processed at the inner hole of the large diameter end face of the bearing inner ring 5, and the positioning boss on the end face of the sealing cover 8 is matched and connected with the positioning shoulder in the inner hole of the large diameter end of the bearing inner ring 5;

[0008] Furthermore, the sealing cover 8 includes a sealing base 8-1 and a sealing rubber ring 8-2; a circular groove is processed at the center of one end surface of the sealing base 8-1, a circular protrusion is processed at the center of the other end surface of the sealing base 8-1, and a sealing rubber ring 8-2 is provided at the edge of the other end surface of the sealing base 8-1;

[0009] Furthermore, the outer surface of the sealing base 8-1 is provided with a nitrile rubber layer, and the thickness H1 of the nitrile rubber layer is 0.2-0.4 mm;

[0010] Furthermore, the thickness H of the sealing base 8-1 is 0.7-1.2 mm;

[0011] Furthermore, a gap L2 is provided between the end surface of the sealing rubber ring 8-2 on the sealing cover 8 and the end surface of the bearing outer ring 4, where L2=0.25-0.3 mm;

[0012] Furthermore, a gap L3 is provided between the inner wall of the sealing rubber ring 8-2 on the sealing cover 8 and the outer surface of the retaining frame 7, and L3 is at least 1.5 mm;

[0013] Furthermore, the sealing rubber ring 8-2 is made of nitrile rubber sealing rubber ring;

[0014] Furthermore, when in use, the bearing sleeve of this structure is arranged on the shaft 2 of the agricultural machinery, and the outer surface of the bearing outer ring 4 is in close contact with the inner wall of the shell 1, and a gap L1 is provided between the outer surface of the sealing rubber ring 8-2 on the sealing cover 8 of the bearing and the inner wall of the shell 1, and L1=0.2~0.25mm; and a gap L is provided between the end face edge of the sealing base 8-1 on the sealing cover 8 of the bearing and the outer surface of the shell 1, and L=0.25~0.3mm; this setting realizes the non-contact fit between the sealing rubber ring 8-2 on the sealing cover 8, the shell 1 and the bearing outer ring 4 to improve the sealing effect; finally, the pre-tightening nut 3 is matched with the circular groove in the center of the end face of one side of the sealing base 8-1, and the pre-tightening force is loaded on the bearing to control the accurate installation of the bearing, thereby completing the installation of the bearing.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model overcomes the shortcomings of the prior art, and utilizes a gap L2 between the end face of the sealing rubber ring on the sealing cover and the end face of the bearing outer ring, a gap L3 between the inner wall of the sealing rubber ring on the sealing cover and the outer surface of the retaining frame, a gap L1 between the outer surface of the sealing rubber ring on the sealing cover of the bearing and the inner wall of the shell, and a gap L between the end face edge of the sealing base on the sealing cover of the bearing and the outer surface of the shell, forming a "labyrinth" type sealing channel, and using the tension generated by the lubricating oil in the "labyrinth" type sealing channel to effectively prevent dust from invading the interior of the bearing, thereby improving the sealing of the bearing, and then avoiding the occurrence of pollution inside the bearing, and is greatly suitable for agricultural machinery.

[0017] 2. The utility model overcomes the shortcomings of the prior art. When in use, the bearing sleeve of this structure is arranged on the shaft of the agricultural machinery, and the outer surface of the outer ring of the bearing is in close contact with the inner wall of the housing. The pre-tightening nut is then matched and connected with the circular groove at the center of the end face of one side of the sealing base, and the bearing is loaded with a pre-tightening force to control the accurate installation of the bearing, thereby completing the installation of the bearing and solving the problem of difficult installation and sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a main sectional view of a sealed tapered roller bearing for agricultural machinery described in the utility model;

[0019] Figure 2 yes Figure 1 A partially enlarged schematic diagram of part I of a sealed tapered roller bearing for agricultural machinery described in the utility model;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of a sealing cover in a sealed tapered roller bearing for agricultural machinery described in the utility model. DETAILED DESCRIPTION

[0021] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The sealed tapered roller bearing for agricultural machinery described in the present embodiment comprises a bearing outer ring 4, a bearing inner ring 5, tapered rollers 6, a retainer 7 and a sealing cover 8;

[0022] The cross section of the bearing inner ring 5 is truncated cone-shaped, and the outer surface of the bearing inner ring 5 is processed with a channel in the circumferential direction. The center hole of the bearing outer ring 4 is a tapered hole. The bearing outer ring 4 is sleeved on the bearing inner ring 5. A retainer 7 is provided between the inner wall of the bearing outer ring 4 and the outer surface of the bearing inner ring 5. A plurality of tapered rollers 6 are provided on the retainer 7, and the tapered rollers 6 are arranged inside the channel on the outer surface of the bearing inner ring 5. A positioning shoulder is processed at the inner hole of the large diameter end face of the bearing inner ring 5, and the positioning boss on the end face of the sealing cover 8 is matched and connected with the positioning shoulder in the inner hole of the large diameter end of the bearing inner ring 5;

[0023] In this specific embodiment, when in use, the bearing sleeve of this structure is set on the shaft 2 of the agricultural machinery, and the outer surface of the bearing outer ring 4 is in close contact with the inner wall of the housing 1, and a gap L1 is provided between the outer surface of the sealing rubber ring 8-2 on the upper sealing cover 8 of the bearing and the inner wall of the housing 1, and L1=0.2~0.25mm; and a gap L is provided between the end face edge of the sealing base 8-1 on the upper sealing cover 8 of the bearing and the outer surface of the housing 1, and L=0.25~0.3mm; this arrangement realizes the sealing rubber ring 8-2 on the sealing cover 8 and the housing 1 and the outer ring 4 of the bearing form a non-contact fit to improve the sealing effect; finally, the pre-tightening nut 3 is matched with the circular groove in the center of the end face of one side of the sealing base 8-1, and the pre-tightening force is applied to the bearing to control the accurate installation of the bearing, thereby completing the installation of the bearing; since the working environment of agricultural machinery and equipment is dusty and muddy, it has a great impact on the life of the bearing, and the tapered roller bearing cannot be installed with a sealing structure inside the bearing due to its special structure, so the step design of the inner ring of the bearing is reserved to leave a matching space and install a sealing cover outside the bearing. Through the design of the sealing cover structure, a non-contact seal is formed with the bearing and the housing, and a curved channel in the form of a "maze" is formed to prevent the intrusion of dust, muddy water, and improve the service life of the bearing.

[0024] Specific implementation method 2: Combination Figures 1 to 3 The present embodiment is described as a further limitation of the bearing described in the first embodiment. The present embodiment is a sealed tapered roller bearing for agricultural machinery, wherein the sealing cover 8 comprises a sealing base 8-1 and a sealing rubber ring 8-2. A circular groove is machined at the center of one end face of the sealing base 8-1, a circular protrusion is machined at the center of the other end face of the sealing base 8-1, and a sealing rubber ring 8-2 is provided at the edge of the other end face of the sealing base 8-1.

[0025] Specific implementation method three: Combination Figures 1 to 3 Description of this embodiment: This embodiment is a further limitation of the bearing described in the second specific embodiment. In the sealed tapered roller bearing for agricultural machinery described in this embodiment, the outer surface of the sealing base 8-1 is provided with a nitrile rubber layer, and the thickness H1 of the nitrile rubber layer is 0.2 to 0.4 mm.

[0026] Specific implementation method four: Combination Figures 1 to 3 This embodiment is described as a further limitation of the bearing described in the third embodiment. In the sealed tapered roller bearing for agricultural machinery described in this embodiment, the thickness H of the sealing base 8-1 is 0.7-1.2 mm.

[0027] Specific implementation method five: Combination Figures 1 to 3To explain this embodiment, this embodiment is a further limitation on the bearing described in the second specific embodiment. In the sealed tapered roller bearing for agricultural machinery described in this embodiment, a gap L2 is provided between the end face of the sealing rubber ring 8-2 on the sealing cover 8 and the end face of the bearing outer ring 4, and L2=0.25~0.3mm.

[0028] Specific implementation method six: Combination Figures 1 to 3 This embodiment is described. This embodiment is a further limitation of the bearing described in the specific embodiment 5. In the sealed tapered roller bearing for agricultural machinery described in this embodiment, a gap L3 is provided between the inner wall of the sealing rubber ring 8-2 on the sealing cover 8 and the outer surface of the retaining frame 7, and L3 is at least 1.5 mm.

[0029] In this specific embodiment, by controlling the gap L3 between the inner wall of the sealing rubber ring 8 - 2 on the sealing cover 8 and the outer surface of the retaining frame 7 , it is ensured that there will be no interference inside the bearing.

[0030] Specific implementation method seven: Combination Figures 1 to 3 This embodiment is described as a further limitation of the bearing described in the sixth embodiment. In the sealed tapered roller bearing for agricultural machinery described in this embodiment, the sealing rubber ring 8-2 is a nitrile rubber sealing rubber ring.

[0031] How it works

[0032] When in use, the bearing sleeve of this structure is arranged on the shaft 2 of the agricultural machinery, and the outer surface of the bearing outer ring 4 is in close contact with the inner wall of the shell 1, and a gap L1 is provided between the outer surface of the sealing rubber ring 8-2 on the sealing cover 8 of the bearing and the inner wall of the shell 1, and L1=0.2~0.25mm; and a gap L is provided between the end face edge of the sealing base 8-1 on the sealing cover 8 of the bearing and the outer surface of the shell 1, and L=0.25~0.3mm; this setting realizes the non-contact cooperation between the sealing rubber ring 8-2 on the sealing cover 8, the shell 1 and the bearing outer ring 4 to improve the sealing effect; finally, the pre-tightening nut 3 is matched and connected with the circular groove at the center of the end face of one side of the sealing base 8-1, and the pre-tightening force is loaded on the bearing to control the accurate installation of the bearing, thereby completing the installation of the bearing.

Claims

1. A sealed tapered roller bearing for agricultural machinery, characterized in that: It comprises a bearing outer ring (4), a bearing inner ring (5), a tapered roller (6), a retaining frame (7) and a sealing cover (8); The cross section of the bearing inner ring (5) is truncated cone-shaped, and the outer surface of the bearing inner ring (5) is processed with a channel in the circumferential direction. The center hole of the bearing outer ring (4) is a tapered hole. The bearing outer ring (4) is sleeved on the bearing inner ring (5). A retainer (7) is provided between the inner wall of the bearing outer ring (4) and the outer surface of the bearing inner ring (5). A plurality of tapered rollers (6) are provided on the retainer (7), and the tapered rollers (6) are arranged inside the channel on the outer surface of the bearing inner ring (5). A positioning shoulder is processed at the inner hole of the large diameter end face of the bearing inner ring (5), and the positioning boss on the end face of the sealing cover (8) is matched and connected with the positioning shoulder in the inner hole of the large diameter end of the bearing inner ring (5); The sealing cover (8) comprises a sealing base (8-1) and a sealing rubber ring (8-2); a circular groove is processed at the center of one end surface of the sealing base (8-1), a circular protrusion is processed at the center of the other end surface of the sealing base (8-1), and a sealing rubber ring (8-2) is provided at the edge of the other end surface of the sealing base (8-1); A gap L2 is provided between the end surface of the sealing rubber ring (8-2) on the sealing cover (8) and the end surface of the bearing outer ring (4), where L2 = 0.25-0.3 mm; A gap L3 is provided between the inner wall of the sealing rubber ring (8-2) on the sealing cover (8) and the outer surface of the retaining frame (7), and L3 is at least 1.5 mm; A gap L1 is provided between the outer surface of the sealing rubber ring (8-2) on the sealing cover (8) and the inner wall of the housing (1), and L1=0.2-0.25 mm.

2. A sealed tapered roller bearing for agricultural machinery according to claim 1, characterized in that: The outer surface of the sealing base (8-1) is provided with a nitrile rubber layer, and the thickness H1 of the nitrile rubber layer is 0.2-0.4 mm.

3. A sealed tapered roller bearing for agricultural machinery according to claim 2, characterized in that: The thickness H of the sealing base (8-1) is 0.7-1.2 mm.

4. The sealed tapered roller bearing for agricultural machinery according to claim 1, characterized in that: The sealing rubber ring (8-2) is made of nitrile rubber sealing rubber ring.

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