Needle roller thrust bearing with external seal

Abstract

An externally-sealed needle roller thrust bearing comprises a seat ring and a shaft ring, a retainer and a needle roller are arranged between the seat ring and the shaft ring, the needle roller is filled in the retainer, the externally-sealed needle roller thrust bearing further comprises two sealing shells arranged on the circumferential sides of the seat ring and the shaft ring in a surrounding mode, and a first abutting section and a second abutting section are arranged on the seat ring and the shaft ring respectively. Each sealing shell is matched with the first abutting section and the second abutting section to fix one side of the seat ring and one side of the shaft ring, and the two sealing shells are matched to enable the seat ring and the shaft ring not to deviate relative to each other. The bearing has the beneficial effects that the sealing shells are respectively clamped on the two sides of the seat ring and the shaft ring, so that the bearing can be directly assembled in place when leaving a factory, and the bearing is more convenient for a user to use subsequently; meanwhile, in the transportation process, the sealing shell can also play a role in fixing the seat ring and the shaft ring, and the situation that the seat ring and the shaft ring deviate due to external impact, and then the seat ring or the shaft ring impacts on the roller pin to cause deformation of the roller pin is prevented.

Description

Technical Field

[0001] The utility model relates to a bearing, in particular to an externally sealed thrust needle roller bearing. Background Art

[0002] Thrust needle roller bearings, with their high load capacity and compact design, are suitable for applications that require axial loads. This type of bearing consists of a seat washer, a shaft washer, a needle roller and a retainer. For protection purposes, the seat washer, shaft washer and retainer assembly of the bearing are usually separated during transportation to prevent vibration and impact from causing damage or deformation of the needle roller.

[0003] Chinese patent document CN220268204U discloses a thrust needle roller bearing, comprising a shaft ring, a seat ring, a retaining frame installed between the shaft ring and the seat ring, and a needle roller, wherein the needle roller is installed on the retaining frame and is evenly separated by the retaining frame, a raised ring is provided on the end face of the seat ring facing the shaft ring, an arc-shaped groove is provided along the circumference of the outer diameter surface of the ring, and an arc-shaped protrusion is provided on one end of the needle roller facing the ring, the arc-shaped protrusion is installed in the arc-shaped groove and can swing in the arc-shaped groove.

[0004] However, the above solution also requires the bearing race, shaft washer and retainer assembly to be separated during transportation, which increases the complexity of subsequent customer installation. They need to reassemble the bearing components and ensure precise alignment. In addition, the separation state may make the components more likely to be lost or damaged, and the cleanliness must be strictly controlled during installation to prevent contamination from affecting the performance and life of the bearing. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an externally sealed thrust needle roller bearing which is easier to transport and install.

[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is as follows: an externally sealed thrust needle roller bearing, comprising a seat ring and a shaft ring, a retaining frame and a needle roller are arranged between the two, the needle roller is loaded in the retaining frame, and also includes two sealing shells arranged in a surrounding shape on the circumference of the seat ring and the shaft ring, the seat ring and the shaft ring are respectively provided with a first abutment section and a second abutment section, each sealing shell is respectively matched with the first abutment section and the second abutment section to fix one side of the seat ring and the shaft ring, and the two sealing shells are matched so that no relative offset occurs between the seat ring and the shaft ring.

[0007] The beneficial effects of the present utility model are as follows: By providing a first abutting section and a second abutting section on the seat ring and the shaft ring respectively, and enabling the sealing housing to be clamped on both sides of the seat ring and the shaft ring, the thrust needle roller bearing in the above solution can be directly assembled in place during factory production, thus realizing the subsequent assembly procedure in advance and making it more convenient for users to use. At the same time, during transportation, the sealing housing can also play a role in fixing the seat ring and the shaft ring, preventing the above-mentioned seat ring and shaft ring from shifting due to external impacts, which may otherwise cause the seat ring or shaft ring to hit the needle rollers and deform the needle rollers. Moreover, after wrapping the shaft ring and the seat ring with the sealing housing, it is more convenient to fill grease between the shaft ring and the seat ring, providing a better operating environment for subsequent use.

[0008] Further, both the first abutting section and the second abutting section are stepped. A tight fit is formed between the side of the sealing housing corresponding to the first abutting section and the first abutting section, and there is a gap between the side of the sealing housing corresponding to the second abutting section and the second abutting section.

[0009] Both the first abutting section and the second abutting section are stepped. At the same time, the outer shape of the sealing housing is correspondingly in the shape of "冖". After the two sealing housings are respectively wrapped around both sides of the shaft ring and the seat ring, they can better wrap the cage and the needle rollers. This can not only prevent dust from entering after assembly, but also better prevent the above two components from shifting in position after the sealing housing is fitted with the shaft ring and the seat ring. In addition, the tight fit between the sealing housing and the first abutting section can prevent relative rotation between the seat ring and the assembled shaft after bearing assembly; the gap between the sealing housing and the second abutting section will not hinder the rotation of the shaft ring.

[0010] Further, the height of the sealing housing on the side relative to the shaft ring is less than the height of the shaft ring, and the height of the sealing housing on the side relative to the seat ring is less than the height of the seat ring.

[0011] The above settings will not interfere with the subsequent assembly of the bearings mentioned in this solution. At the same time, since the height of the sealing housing on the side relative to the shaft ring and the seat ring is respectively less than the height of the shaft ring and the seat ring, a stepped step is formed between the sealing housing and the seat ring or the shaft ring. This stepped step can better prevent the shaft ring and the seat ring from shifting relative to each other when cooperating with other components during transportation.

[0012] Further, the seat ring is provided with a blocking member extending towards the shaft ring. The blocking members are respectively located at both ends of the needle rollers, and the two blocking members cooperate to prevent the needle rollers from shifting.

[0013] The above arrangement is based on the fact that the sealing housing prevents the shaft ring and the seat ring from shifting in position. The blocking member can further prevent the needle roller from shifting in position between the shaft ring and the seat ring during transportation, thereby further ensuring the assembly accuracy from the time of leaving the factory to the time of delivery to the user, and reducing the number of debugging steps for the user in subsequent installation.

[0014] Furthermore, the needle roller is square, and the four corners of the needle roller are arc-shaped, the blocking member faces the needle roller in a direction corresponding to the shape of the four corners of the needle roller, and the blocking member is elastic.

[0015] Preferably, the blocking member can extend from the sealing housing into between the shaft ring and the seat ring to abut against both sides of the needle roller to prevent the needle roller from shifting during transportation. During assembly, the user can remove it and replace it with other blocking members to ensure that the needle roller will not be obstructed during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of an embodiment of the utility model;

[0017] Figure 2 It is a partial enlarged view of the second abutment section of the embodiment of the utility model;

[0018] Figure 3 This is a partial enlarged view of the needle roller during transportation in the embodiment of the utility model;

[0019] Figure 4 This is a partial enlarged view of the needle roller when the embodiment of the utility model is in use. DETAILED DESCRIPTION

[0020] The utility model embodiment of an externally sealed thrust needle roller bearing is as follows Figure 1-4 As shown: it includes a seat ring 1, a shaft ring 2 and a sealing housing 5, and a retaining frame 3 with a needle roller 4 is placed between the seat ring 1 and the shaft ring 2. A first step-shaped abutment section 11 is provided on both sides of the seat ring 1, and a second step-shaped abutment section 21 is provided on both sides of the shaft ring 2. The sealing housing 5 has a shape similar to a cover such as a bottle cap, and is provided at both ends of the seat ring 1 and the shaft ring 2. The sealing housing 5 forms a tight fit with the first abutment section 11, but a gap is left between the sealing housing 5 and the second abutment section 21 for the shaft ring 2 to rotate.

[0021] At the same time, the height of the sealing shell 5 relative to the shaft ring 2 is smaller than the height of the shaft ring 2, and the height of the sealing shell 5 relative to the seat ring 1 is smaller than the inner diameter of the seat ring 1, so that a stepped step is formed between the sealing shell 5 and the seat ring 1 or the shaft ring 2. The stepped step cooperates with other components during transportation to prevent the shaft ring 2 and the seat ring 1 from relative position displacement.

[0022] At the same time, a threaded hole 51 is provided on the sealing shell 5 at the position corresponding to the needle roller 4. The threaded hole 51 can be matched with the blocking member 53 or the blocking member 52. One end of the blocking member 52 is a sealing end 521 matched with the threaded hole 51, and the other end is an elastic blocking end 522. The outer surface of the blocking end 522 corresponding to one side of the needle roller 4 is arranged in an arc shape, and the needle roller is square and its four corners are all arc-shaped chamfers.

[0023] The following is a brief description of the use of this embodiment: the thrust needle roller bearing of this embodiment has already installed the retainer 3 with the needle roller 4 between the seat ring 1 and the shaft ring 2 when it leaves the factory, and then the two sealing shells 5 are sleeved on the left and right sides of the seat ring 1 and the shaft ring 2, but the sealing shell 5 forms a tight fit with the first abutment section 11 set on the seat ring 1, and there is a gap between the sealing shell 5 and the second abutment section 21 set on the shaft ring 2. Then the blocking member 52 is installed between the seat ring 1 and the shaft ring 2 through the threaded hole 51 of the sealing shell 5. As a preference, a scale mark can be set on the outer surface of the sealing end 521 of the blocking member 52 to facilitate the judgment of the position of the blocking end 522 to prevent the blocking end 522 from affecting the assembly position of the needle roller 4. The above setting prevents the assembly position of the present embodiment from being offset during transportation. When the bearing of this embodiment reaches the user, it only needs to remove the blocking member 52 and install the blocking member 53 to complete the assembly of the bearing, which greatly reduces the difficulty of bearing assembly and facilitates the subsequent use of the user.

[0024] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An externally sealed thrust needle roller bearing, comprising a seat ring and a shaft ring, a retainer and a needle roller are arranged between the seat ring and the shaft ring, and the needle roller is loaded in the retainer, characterized in that: It also includes two sealing shells which are arranged in a surrounding shape on the circumference of the seat ring and the shaft ring, and the seat ring and the shaft ring are respectively provided with a first abutment section and a second abutment section, each sealing shell is respectively matched with the first abutment section and the second abutment section to fix one side of the seat ring and the shaft ring, and the two sealing shells are matched to prevent relative displacement between the seat ring and the shaft ring.

2. The externally sealed thrust needle roller bearing according to claim 1, characterized in that: The first abutting section and the second abutting section are both step-shaped, a side of the sealing shell corresponding to the first abutting section forms a tight fit with the first abutting section, and a side of the sealing shell corresponding to the second abutting section and the second abutting section form a gap.

3. The externally sealed thrust needle roller bearing according to claim 2, characterized in that: The height of the sealing housing relative to the shaft ring is smaller than the height of the shaft ring, and the height of the sealing housing relative to the seat ring is smaller than the height of the seat ring.

4. The externally sealed thrust needle roller bearing according to claim 1, characterized in that: It also includes a blocking member extending from the seat ring toward the shaft ring. The blocking members are respectively located at both ends of the needle roller. The two blocking members cooperate to prevent the needle roller from deviating.

5. The externally sealed thrust needle roller bearing according to claim 4, characterized in that: The rolling needle is square, and the four corners of the rolling needle are arc-shaped. The blocking member faces the rolling needle and corresponds to the shape of the four corners of the rolling needle. The blocking member is elastic.

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