Thin-wall double-row tapered roller bearing with shaft seal

Abstract

The utility model provides a thin-wall double-row tapered roller bearing with a shaft seal. The thin-wall double-row tapered roller bearing with the shaft seal comprises a main shaft, an inner ring, an outer ring, a first sealing ring, a baffle ring, a second sealing ring and an extrusion part, according to the thin-wall double-row tapered roller bearing with the shaft seal, provided by the utility model, the main shaft is arranged, the limiting part is arranged at one end of the main shaft, the inner ring is sleeved on the outer side of the main shaft, the outer ring is rotationally arranged on the outer side of the inner ring, the first sealing ring is arranged between the limiting part and the inner ring, and the second sealing ring is arranged between the baffle ring and the inner ring; the first sealing ring and the second sealing ring are located at the two ends of the inner ring respectively. The outer side faces of the first sealing ring and the second sealing ring abut against the inner wall of the outer ring, and therefore the sealing effect of the bearing is achieved. Meanwhile, the extrusion on the outer ring and the inner ring is reduced. The outer ring and the inner ring are prevented from deforming, and the later mounting precision of the bearing is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearings, and in particular relates to a thin-wall double-row tapered roller bearing with shaft seal. Background Art

[0002] Thin-walled bearings have an extremely thin cross-section and are characterized by miniaturization and light weight. Conventional bearings are usually equipped with sealing covers at both ends. The sealing covers can prevent foreign matter from entering the bearing and affecting the lubrication of the bearing. At the same time, they can inhibit the leakage of grease inside the bearing and improve the environmental protection of the use environment. At present, the sealing cover is usually installed between the outer ring and the inner ring of the bearing. The normal interference will cause the thin-walled bearing ring to deform, causing the ring to lose its original precision and affect the normal use of the bearing. Utility Model Content

[0003] The utility model provides a thin-wall double-row tapered roller bearing with shaft seal, aiming to solve the problem in the prior art that the installation method of the thin-wall bearing seal cover easily causes the ring to deform and affects the normal use of the bearing.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a thin-walled double-row tapered roller bearing with shaft seal, comprising:

[0005] Spindle;

[0006] An inner ring is sleeved on the outer side of the main shaft, a limiting portion for abutting against one end of the inner ring is provided on the main shaft, and an outer ring is rotatably provided on the outer side of the inner ring;

[0007] A first sealing ring, the outer side of which abuts against the outer ring, and the inner side of which is clamped between the inner ring and the limiting portion;

[0008] A retaining ring, which is sleeved on the outer side of the main shaft, and is located at an end of the inner ring away from the limiting portion;

[0009] A second sealing ring, the outer side of which abuts against the outer ring, and the inner side of which is clamped between the retaining ring and the inner ring;

[0010] An extrusion piece is installed between the main shaft and the retaining ring and is used to squeeze the retaining ring onto the end of the inner ring.

[0011] In a possible implementation, an annular groove for mounting the first sealing ring and the second sealing ring is formed on the inner wall of the outer ring, and the outer sides of the first sealing ring and the second sealing ring abut against the inner wall of the annular groove.

[0012] In a possible implementation, the outer sides of the first sealing ring and the second sealing ring are both sleeved with elastic collars, and the elastic collars are pressed against the inner wall of the annular groove.

[0013] In a possible implementation manner, an abutment portion is protruded from the outer side of the elastic ring and is used to abut against the inner wall of the groove.

[0014] In a possible implementation, an annular groove is concavely provided on the end surface of the limiting portion, and the inner ring of the first sealing ring is bent outward to be provided with a positioning portion for being clamped into the annular groove.

[0015] In a possible implementation, the first sealing ring includes a fixing portion fixed between the limiting portion and the inner ring and a sealing portion located between the inner ring and the outer ring, and the fixing portion and the sealing portion are connected via a connecting portion.

[0016] In a possible implementation, there are two inner rings, the two inner rings are arranged at intervals along the axis of the main shaft, and a pre-tightening spacer is installed between the two inner rings.

[0017] In a possible implementation, the extrusion piece is threadedly connected to the main shaft and abuts against an end surface of the retaining ring.

[0018] Compared with the prior art, the scheme shown in the embodiment of the present application is provided with a main shaft, a limiting part with an outer diameter larger than that of the main shaft is provided at one end of the main shaft, and an inner ring is sleeved on the outer side of the main shaft, the inner ring and the main shaft are interference fit, and the end of the inner ring is against the limiting part. An outer ring is rotatably provided on the outer side of the inner ring, a roller is installed between the inner ring and the outer ring, and the outer ring is rotatably provided on the outer side of the inner ring through the roller. A first sealing ring is installed between the limiting part and the inner ring, and a second sealing ring is installed between the retaining ring and the inner ring, and the first sealing ring and the second sealing ring are respectively located at the two ends of the inner ring. And the first sealing ring and the second sealing ring are clamped at the two ends of the inner ring through the limiting part and the retaining ring, and the outer side surfaces of the first sealing ring and the second sealing ring are against the inner wall of the outer ring, thereby achieving the sealing effect of the bearing. At the same time, the extrusion of the outer ring and the inner ring is reduced. The outer ring and the inner ring are prevented from deformation, and the installation accuracy of the bearing in the later stage is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a thin-walled double-row tapered roller bearing with shaft seal provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the installation structure of the first sealing ring provided in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. Main shaft; 2. Inner ring; 21. Preload spacer; 3. Outer ring; 4. First sealing ring; 41. Positioning part; 42. Fixing part; 43. Sealing part; 44. Connecting part; 5. Retaining ring; 6. Second sealing ring; 7. Extrusion piece; 8. Elastic sleeve; 81. Interference part. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Please also read Figure 1 and Figure 2 , the utility model provides a thin-walled double-row tapered roller bearing with shaft seal. The thin-walled double-row tapered roller bearing with shaft seal comprises a main shaft 1, an inner ring 2, a first sealing ring 4, a retaining ring 5, a second sealing ring 6 and an extrusion piece 7. The inner ring 2 is sleeved on the outer side of the main shaft 1, and a limiting portion for abutting against one end of the inner ring 2 is provided on the main shaft 1, and an outer ring 3 is rotatably provided on the outer side of the inner ring 2; the first sealing ring 4 abuts against the outer ring 3 on the outer side, and is clamped between the inner ring 2 and the limiting portion on the inner side; the retaining ring 5 is sleeved on the outer side of the main shaft 1, and the retaining ring 5 is located at one end of the inner ring 2 away from the limiting portion; the second sealing ring 6 abuts against the outer ring 3 on the outer side, and is clamped between the retaining ring 5 and the inner ring 2 on the inner side; the extrusion piece 7 is installed between the main shaft 1 and the retaining ring 5, and is used to squeeze the retaining ring 5 on the end of the inner ring 2.

[0025] Compared with the prior art, the thin-wall double-row tapered roller bearing with shaft seal provided in this embodiment is provided with a main shaft 1, a limiting portion with an outer diameter larger than that of the main shaft 1 is provided at one end of the main shaft 1, and an inner ring 2 is sleeved on the outer side of the main shaft 1, the inner ring 2 and the main shaft 1 are interference fit, and the end of the inner ring 2 is against the limiting position. An outer ring 3 is rotatably provided on the outer side of the inner ring 2, a roller is installed between the inner ring 2 and the outer ring 3, and the outer ring 3 is rotatably arranged on the outer side of the inner ring 2 through the roller. A first sealing ring 4 is installed between the limiting portion and the inner ring 2, and a second sealing ring 6 is installed between the retaining ring 5 and the inner ring 2, and the first sealing ring 4 and the second sealing ring 6 are respectively located at the two ends of the inner ring 2. And the first sealing ring 4 and the second sealing ring 6 are clamped at the two ends of the inner ring 2 through the limiting portion and the retaining ring 5, and the outer side surfaces of the first sealing ring 4 and the second sealing ring 6 are against the inner wall of the outer ring 3, thereby achieving the sealing effect of the bearing. At the same time, the extrusion of the outer ring 3 and the inner ring 2 is reduced. Prevent the outer ring 3 and the inner ring 2 from deformation and ensure the later installation accuracy of the bearing.

[0026] Specifically, in this embodiment, two groups of tapered rollers are provided between the inner ring 2 and the outer ring 3 and are oppositely arranged, and the tapered rollers are installed between the inner ring 2 and the outer ring 3 via a retaining frame.

[0027] In some embodiments, the inner ring 2 may be formed as follows: Figure 1 , Figure 2 See also Figure 1 , Figure 2 , an annular groove for installing the first sealing ring 4 and the second sealing ring 6 is concavely provided on the inner wall of the outer ring 3, and the outer sides of the first sealing ring 4 and the second sealing ring 6 abut against the inner wall of the annular groove. An annular groove is concavely provided on the inner wall at both ends of the outer ring 3. The outer sides of the first sealing ring 4 and the second sealing ring 6 are located inside the annular groove and abut against the inner wall of the innermost side of the annular groove. On the one hand, the stability of the installation position between the first sealing ring 4 and the second sealing ring 6 can be improved, and at the same time, external dust can be further prevented from directly flowing into the bearing from the gap between the inner ring and the first sealing ring 4 or the second sealing ring 6. Further improve the sealing effect.

[0028] In some embodiments, the first sealing ring 4 and the second sealing ring 6 may be formed as follows: Figure 1 , Figure 2 See also Figure 1 , Figure 2 , the outer sides of the first sealing ring 4 and the second sealing ring 6 are both covered with elastic collars 8, and the elastic collars 8 are against the inner wall of the annular groove. The outer sides of the first sealing ring 4 and the second sealing ring 6 are both covered with elastic collars 8, and the elastic collars 8 are made of nitrile rubber. On the one hand, according to the elasticity of the elastic collar 8 itself, the elastic collar 8 can always be against the inner wall of the annular groove. At the same time, the setting of the elastic collar 8 can avoid damage to the inner wall of the annular groove when the outer ring 3 rotates relative to the inner ring 2, which causes the friction between the inner ring 2 and the outer ring 3 to increase. Improve the stability during use.

[0029] Specifically, in this embodiment, two spaced-apart clamping arms are provided on the elastic collar 8, and the two clamping arms form an installation gap for installing the outer edge of the first sealing ring 4 or the outer edge of the second sealing ring 6, so as to facilitate the connection between the elastic collar 8 and the first sealing ring 4 or the second sealing ring 6.

[0030] Specifically, in this embodiment, the first sealing ring 4 and the second sealing ring 6 are made of rigid material, and the elastic sleeve ring 8 can prevent the first sealing ring 4 and the second sealing ring 6 from causing damage to the outer ring 3.

[0031] Preferably, in this embodiment, an anti-slip portion is bent at the outer edges of the first sealing ring 4 and the second sealing ring 6, and the anti-slip portion is located inside the installation gap on the elastic ring 8, which can improve the stability of the elastic ring 8 installed inside the first sealing ring 4 and the second sealing ring 6.

[0032] In some embodiments, the elastic collar 8 may be Figure 1 , Figure 2 See also Figure 1 , Figure 2 The outer side of the elastic collar 8 is protruded with a contact portion 81 for contacting the inner wall of the groove. The contact portion 81 on the outer side of the elastic collar 8 is located inside the annular groove and contacts the inner wall of the annular groove. The cross-sectional dimension of the contact portion 81 is smaller than the cross-sectional dimension of the elastic collar 8, so that the contact area between the elastic collar 8 and the outer ring 3 is reduced. The friction between the elastic collar 8 and the outer ring 3 is reduced. At the same time, a good sealing effect can be achieved.

[0033] In some embodiments, the above-mentioned limiter can be used as follows: Figure 1 , Figure 2 See also Figure 1 , Figure 2 , an annular groove is concavely provided on the end surface of the limiting part, and the inner ring 2 of the first sealing ring 4 is bent outwardly to provide a positioning part 41 for clamping into the inside of the annular groove. An annular groove is concavely provided on the end surface of the limiting part, and a positioning part 41 is bent outwardly on the inner wall of the first sealing ring 4. The positioning part 41 is an annular structure and slides with the annular groove. When installing the first sealing ring 4, the positioning part 41 can be installed inside the annular groove first. Then the inner ring 2 is used to abut against the outside of the first sealing ring 4, so that the first sealing ring 4 can be limited between the limiting part and the inner ring 2. The structure is simple and convenient for installing the first sealing ring 4.

[0034] Specifically, in this embodiment, an annular groove is also concavely provided on the end surface of the retaining ring 5 near one end of the inner ring 2. A positioning portion 41 for clamping into the annular groove is bent and provided on the inner ring 2 of the second sealing ring. When installing the second sealing ring, the positioning portion 41 can be placed inside the annular groove at the end of the retaining ring 5, and then the retaining ring 5 is pushed to move to the end of the inner ring 2. Thus, the second sealing ring is limited between the retaining ring 5 and the inner ring 2. By providing annular grooves on the limiting portion and the retaining ring 5, the installation of the first sealing ring 4 and the second sealing ring 6 can be facilitated. At the same time, the stability of the installation position of the first sealing ring 4 and the second sealing ring 6 can be improved. It is ensured that the elastic sleeve ring 8 on the outside of the first sealing ring 4 and the second sealing ring 6 can be stably fitted on the inner wall of the outer ring 3.

[0035] In some embodiments, the first sealing ring 4 may be formed as follows: Figure 1 , Figure 2See also Figure 1 , Figure 2 The first sealing ring 4 includes a fixing portion 42 fixed between the limiting portion and the inner ring 2 and a sealing portion 43 located between the inner ring 2 and the outer ring 3, and the fixing portion 42 and the sealing portion 43 are connected by a connecting portion 44. The first sealing ring 4 includes a fixing portion 42, which is used to be squeezed between the limiting portion and the inner ring 2, and the outer ring 3 of the fixing portion 42 extends out of the outer side of the inner ring 2, and the connecting portion 44 is sleeved on the outer side of the inner ring 2 and slidably cooperates with the outer side wall of the inner ring 2. The sealing portion 43 is installed on the outer side of the connecting portion 44, and the sealing portion 43 is used to abut against the inner wall of the outer ring 3 to achieve sealing between the inner ring 2 and the outer ring 3. The first sealing ring 4 is an integrally formed structure to ensure the strength of the first sealing ring 4, and the setting of the connecting portion 44 can improve the stability of the connection position between the first sealing ring 4 and the inner ring 2.

[0036] Specifically, in this embodiment, the first sealing ring 6 and the second sealing ring 6 have the same structure.

[0037] In some embodiments, the inner ring 2 may be formed as follows: Figure 1 See the structure shown. Figure 1 There are two inner rings 2, which are arranged at intervals along the axis of the main shaft 1, and a preload spacer 21 is installed between the two inner rings 2. Tapered rollers are used between the inner ring 2 and the outer ring 3, and the tapered rollers on the two inner rings 2 are arranged oppositely, and a preload spacer 21 is installed between the two inner rings 2. By adjusting the thickness of the preload spacer 21, it is convenient to adjust the spacing between the two inner rings 2, thereby correcting the gap between the tapered roller and the inner ring 2 and the outer ring 3, and ensuring that the outer ring 3 can rotate smoothly and stably relative to the inner ring 2.

[0038] In some embodiments, the extrusion member 7 may be formed as follows: Figure 1 See the structure shown. Figure 1 , the extrusion piece 7 is threadedly connected to the main shaft 1 and abuts against the end face of the retaining ring 5. The inner ring 2 and the retaining ring 5 are located between the limiting portion and the extrusion piece 7. By rotating the extrusion piece 7, the retaining ring 5 can be abutted against one end of the inner ring 2 and the inner ring 2 can be limited on the limiting portion. A threaded portion that is threadedly matched with the extrusion piece 7 is provided at one end of the main shaft 1, and a mounting portion for mounting the inner ring 2 is provided on the main shaft 1. The outer diameter of the threaded portion is smaller than the outer diameter of the mounting portion, thereby facilitating the installation of the inner ring 2.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thin-walled double-row tapered roller bearing with shaft seal, characterized in that: include: Spindle (1); The inner ring (2) is sleeved on the outer side of the main shaft (1); the main shaft (1) is provided with a limiting portion for abutting against one end of the inner ring (2); and the outer side of the inner ring (2) is rotatably provided with an outer ring (3); A first sealing ring (4), the outer side of which abuts against the outer ring (3), and the inner side of which is clamped between the inner ring (2) and the limiting portion; A retaining ring (5) is sleeved on the outer side of the main shaft (1), and the retaining ring (5) is located at an end of the inner ring (2) away from the limiting portion; A second sealing ring (6), the outer side of which abuts against the outer ring (3), and the inner side of which is clamped between the retaining ring (5) and the inner ring (2); An extrusion piece (7) is installed between the main shaft (1) and the retaining ring (5) and is used to squeeze the retaining ring (5) onto the end of the inner ring (2).

2. The thin-walled double-row tapered roller bearing with shaft seal according to claim 1, characterized in that: An annular groove for mounting the first sealing ring (4) and the second sealing ring (6) is recessed on the inner wall of the outer ring (3), and the outer sides of the first sealing ring (4) and the second sealing ring (6) abut against the inner wall of the annular groove.

3. The thin-walled double-row tapered roller bearing with shaft seal according to claim 2, characterized in that: The outer sides of the first sealing ring (4) and the second sealing ring (6) are both sleeved with elastic collars (8), and the elastic collars (8) are pressed against the inner wall of the annular groove.

4. The thin-walled double-row tapered roller bearing with shaft seal according to claim 3, characterized in that: The outer side of the elastic collar (8) is protruded to be provided with a contact portion (81) for contacting against the inner wall of the groove.

5. The thin-walled double-row tapered roller bearing with shaft seal according to claim 1, characterized in that: An annular groove is concavely provided on the end surface of the limiting portion, and the inner ring (2) of the first sealing ring (4) is bent outwardly to provide a positioning portion (41) for being clamped into the annular groove.

6. The thin-wall double-row tapered roller bearing with shaft seal according to claim 1, characterized in that: The first sealing ring (4) comprises a fixing portion (42) fixed between the limiting portion and the inner ring (2) and a sealing portion (43) located between the inner ring (2) and the outer ring (3); the fixing portion (42) and the sealing portion (43) are connected via a connecting portion (44).

7. The thin-wall double-row tapered roller bearing with shaft seal according to claim 1, characterized in that: The number of the inner rings (2) is two, the two inner rings (2) are arranged at intervals along the axis of the main shaft (1), and a pre-tightening spacer (21) is installed between the two inner rings (2).

8. The thin-wall double-row tapered roller bearing with shaft seal according to claim 1, characterized in that: The extrusion piece (7) is threadedly connected to the main shaft (1) and abuts against the end surface of the retaining ring (5).

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