A cross roller bearing with a composite sealing structure

Abstract

The invention provides a cross roller bearing with a composite sealing structure, which reduces the effect of grease and internal pressure on the skeleton oil seal and improves the overall sealing performance of the bearing. The bearing comprises a bearing inner ring, a bearing outer ring, and a roller part, wherein the bearing inner ring and the bearing outer ring are combined to form a roller mounting ring cavity, the roller part is located at a corresponding position of the roller mounting ring cavity, a skeleton oil seal is arranged on one of the end faces of the bearing inner ring and the bearing outer ring, and the skeleton oil seal plug is installed in the corresponding end face mounting ring gap of the bearing inner ring and the bearing outer ring, and is characterized in that a gap ring groove is arranged between the outer ring surface of the bearing inner ring located inside the skeleton oil seal and the inner ring surface of the bearing outer ring, and the inner end ring surface of the bearing outer ring facing the skeleton oil seal comprises an outer ring stop ring surface and an inner ring stop ring surface, and further comprises a PTFE seal and a sealing retainer, wherein the PTFE seal comprises a radial positioning ring surface and a raised ring, and the PTFE seal is provided with a raised ring corresponding to the gap ring groove.

Description

Technical Field

[0001] The invention relates to the technical field of roller bearing structures, in particular to a cross roller bearing with a composite sealing structure. Background Art

[0002] In the application of harmonic reducers, cross roller bearings not only play a supporting role but also a sealing role. Existing cross roller bearings use a skeleton oil seal for sealing. This sealing method has a high oil seepage and leakage rate in actual work. Summary of the invention

[0003] In view of the above problems, the present invention provides a cross roller bearing with a composite sealing structure, which reduces the effect of grease and internal pressure on the skeleton oil seal and improves the overall sealing performance of the bearing.

[0004] A cross roller bearing with a composite sealing structure, the technical solution of which is as follows: it comprises a bearing inner ring, a bearing outer ring, and a roller part, the bearing inner ring and the bearing outer ring are combined to form a roller mounting ring cavity, the roller part is located at a corresponding position of the roller mounting ring cavity, a skeleton oil seal is arranged on one of the end faces of the bearing inner ring and the bearing outer ring, the skeleton oil seal plug is installed in the corresponding end face mounting ring gap of the bearing inner ring and the bearing outer ring, and is characterized in that a clearance ring groove is arranged between the outer ring surface of the bearing inner ring located on the inner side of the skeleton oil seal and the inner ring surface of the bearing outer ring, and the inner end ring surface of the bearing outer ring facing the skeleton oil seal comprises an outer ring stop ring The PTFE seal comprises a radial positioning ring surface and a raised ring. The PTFE seal is provided with a raised ring corresponding to the gap ring groove. The raised ring is embedded in the corresponding gap ring groove. The inner end of the skeleton oil seal presses the outer ring end of the seal retainer against the outer ring stop ring surface of the bearing outer ring. The inner ring pressing end of the seal retainer presses the outer end face of the radial positioning ring surface. The inner end face of the radial positioning ring surface is arranged closely against the radial inner end face of the inner ring stop ring surface. The inner ring sealing surface of the raised ring is in sliding fit contact with the corresponding outer ring surface of the bearing inner ring.

[0005] It is further characterized by:

[0006] The outer ring of the raised ring is press-fitted onto the corresponding inner circumference of the outer ring of the bearing corresponding to the clearance ring groove, ensuring that the installation of the PTFE seal is stable and reliable;

[0007] The sealing retainer also includes a connecting thickened portion, the outer ring end of the sealing retainer is connected to the inner ring press-attached end through the connecting thickened portion, the connecting thickened portion and the inner ring press-attached end form a contoured ring groove, the radial positioning ring surface is embedded in the contoured ring groove, and the inner end of the connecting thickened portion is arranged in close contact with the radial outer end surface of the inner ring stop ring surface to ensure the pressing force for the PTFE sealing member;

[0008] The inner ring of the clearance ring groove at one end facing the roller part is provided with a concave ring groove, and the rubber O-ring is fitted into the concave ring groove. The outer ring of the rubber O-ring is attached to the corresponding position of the outer ring of the clearance ring groove, which further reduces the flow of grease to the skeleton oil seal, so that the pressure on the skeleton oil seal is reduced.

[0009] After adopting the above technical solution, a PTFE seal is used, which is interference fit with the outer ring of the bearing through a seal retainer, and the sealing surface of the inner ring of the seal and the corresponding outer ring surface of the inner ring of the bearing slide together to play a sealing role, which reduces the amount of lubricating oil flowing to the skeleton oil seal through the gap ring groove and reduces the pressure of the lubricating oil. It reduces the effect of grease and internal pressure on the skeleton oil seal and improves the overall sealing performance of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of a specific embodiment of the invention;

[0011] Figure 2 for Figure 1 A local enlarged structural schematic diagram;

[0012] Figure 3 It is a structural schematic diagram of a specific embodiment 2 of the present invention;

[0013] Figure 4 for Figure 3 A schematic diagram of the local enlarged structure at B;

[0014] The names corresponding to the serial numbers in the figure are as follows:

[0015] Bearing inner ring 1, bearing outer ring 2, roller part 3, roller mounting ring cavity 4, skeleton oil seal 5, mounting ring gap 6, clearance ring groove 7, outer ring stop ring surface 8, inner ring stop ring surface 9, PTFE seal 10, radial positioning ring surface 101, raised ring 102, seal retainer 11, outer ring end 111, inner ring pressed end 112, connection thickened part 113, contoured ring groove 114, concave ring groove 12, rubber O-ring 13. DETAILED DESCRIPTION

[0016] A cross roller bearing with a composite seal structure, see Figure 1-Figure 4:It includes a bearing inner ring 1, a bearing outer ring 2, and a roller part 3. The bearing inner ring 1 and the bearing outer ring 2 are combined to form a roller mounting ring cavity 4. The roller part 3 is located at a corresponding position of the roller mounting ring cavity 4. A skeleton oil seal 5 is arranged on one of the end faces of the bearing inner ring 1 and the bearing outer ring 2. The skeleton oil seal 5 is plugged and installed in the corresponding end face mounting ring gap 6 of the bearing inner ring 1 and the bearing outer ring 2. A clearance ring groove 7 is arranged between the outer ring surface of the bearing inner ring 1 located on the inner side of the skeleton oil seal 5 and the inner ring surface of the bearing outer ring 2. The inner end ring surface of the bearing outer ring 2 facing the skeleton oil seal 5 includes an outer ring stop ring surface 8 and an inner ring stop ring surface 9. It also includes a PTFE seal 10, a seal The retaining member 11 and the PTFE sealing member 10 include a radial positioning annular surface 101 and a raised ring 102. The PTFE sealing member 10 is provided with a raised ring 102 corresponding to the clearance annular groove 7. The raised ring 102 is embedded in the corresponding clearance annular groove 7. The inner end of the skeleton oil seal 5 presses the outer ring end 111 of the sealing retaining member 11 against the outer ring stop annular surface 8 of the bearing outer ring 2. The inner ring pressing end 112 of the sealing retaining member 11 presses the outer end surface of the radial positioning annular surface 101. The inner end surface of the radial positioning annular surface 101 is arranged closely against the radial inner end surface of the inner ring stop annular surface 9. The inner ring sealing surface of the raised ring 102 is in sliding contact with the corresponding outer ring surface of the bearing inner ring 1.

[0017] The outer ring of the raised ring 102 is press-fitted into the corresponding inner circumference of the bearing outer ring 2 corresponding to the clearance ring groove 7, ensuring that the PTFE seal 10 is installed firmly and reliably;

[0018] The sealing retainer 11 also includes a connecting thickened portion 113. The outer ring end 111 of the sealing retainer 11 is connected to the inner ring press-attachment end 112 through the connecting thickened portion 113. The connecting thickened portion 113 and the inner ring press-attachment end 112 form a contoured ring groove 114. The radial positioning ring surface 101 is embedded in the contoured ring groove 114. The inner end of the connecting thickened portion 113 is arranged in close contact with the radial outer end surface of the inner ring stop ring surface 9 to ensure the pressure on the PTFE seal 10.

[0019] Specific embodiment 1, see Figure 1 and Figure 2 : A PTFE seal 10 is installed at the position of the clearance ring groove 7 facing the skeleton oil seal 5.

[0020] Specific embodiment 2, see Figure 3 and Figure 4 : A PTFE seal 10 is installed at the position of the clearance ring groove 7 facing the skeleton oil seal 5, and an inner ring of the clearance ring groove 7 at one end facing the roller part 3 is provided with an inner concave ring groove 12, a rubber O-ring 13 is fitted into the inner concave ring groove 12, and the outer ring of the rubber O-ring 13 is attached to the corresponding position of the outer ring of the clearance ring groove 7, which further reduces the flow of grease to the skeleton oil seal, so that the pressure on the skeleton oil seal is small.

[0021] Its working principle is as follows: PTFE seals are used, which are interference fit with the outer ring of the bearing through the seal retainer, and the sealing surface of the inner ring of the seal and the corresponding outer ring surface of the inner ring of the bearing slide together to play a sealing role, which reduces the amount of lubricating oil flowing to the skeleton oil seal through the gap ring groove and reduces the pressure of the lubricating oil. It reduces the effect of grease and internal pressure on the skeleton oil seal and improves the overall sealing performance of the bearing.

[0022] In this article, PTFE is the English abbreviation of polytetrafluoroethylene.

[0023] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0024] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cross roller bearing with a composite sealing structure, comprising a bearing inner ring, a bearing outer ring, and a roller part, wherein the bearing inner ring and the bearing outer ring are combined to form a roller mounting ring cavity, wherein the roller part is located at a corresponding position of the roller mounting ring cavity, wherein a skeleton oil seal is arranged on one of the end faces of the bearing inner ring and the bearing outer ring, wherein the skeleton oil seal plug is installed in the corresponding end face mounting ring gap of the bearing inner ring and the bearing outer ring, and wherein: A clearance ring groove is arranged between the outer ring surface of the bearing inner ring located on the inner side of the skeleton oil seal and the inner ring surface of the bearing outer ring. The inner end ring surface of the bearing outer ring facing the skeleton oil seal includes an outer ring stop ring surface and an inner ring stop ring surface, and also includes a PTFE seal and a seal retainer. The PTFE seal includes a radial positioning ring surface and a raised ring. The PTFE seal is provided with a raised ring corresponding to the clearance ring groove, and the raised ring is embedded in the corresponding clearance ring groove. The inner end of the skeleton oil seal presses the outer ring end of the seal retainer on the outer ring stop ring surface of the bearing outer ring, and the inner ring pressing end of the seal retainer presses the outer end surface of the radial positioning ring surface. The inner end surface of the radial positioning ring surface is arranged in close contact with the radial inner end surface of the inner ring stop ring surface, and the inner ring sealing surface of the raised ring is in sliding fit contact with the corresponding outer ring surface of the bearing inner ring.

2. A cross roller bearing with a composite sealing structure as claimed in claim 1, characterized in that: The outer ring of the raised ring is press-fitted onto the corresponding inner circumference of the outer ring of the bearing corresponding to the clearance ring groove.

3. A cross roller bearing with a composite sealing structure as claimed in claim 2, characterized in that: The sealing retainer also includes a connecting thickened portion, and the outer ring end of the sealing retainer is connected to the inner ring press-attached end through the connecting thickened portion. The connecting thickened portion and the inner ring press-attached end form a contoured ring groove, and the radial positioning ring surface is embedded in the contoured ring groove. The inner end of the connecting thickened portion is arranged in close contact with the radial outer end surface of the inner ring stop ring surface.

4. A cross roller bearing with a composite sealing structure as claimed in claim 1, characterized in that: The inner ring of the clearance ring groove at one end facing the roller part is provided with an inner concave ring groove, a rubber O-ring is sleeved in the inner concave ring groove, and the outer ring of the rubber O-ring is attached to the corresponding position of the outer ring of the clearance ring groove.

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