Universal joint structure with high rotation precision

Abstract

The utility model relates to the technical field of universal joints, in particular to a universal joint structure with high rotating precision, which comprises a fixing block, and a first universal joint fork is clamped on one side of the outer surface of the fixing block. Due to the arrangement of the fixing block, the first universal joint fork, the second universal joint fork, the shaft, the bearing, the bearing cover and the bolt, when the universal joint is used, the bearing is assembled on the shaft through press fitting, then the first universal joint fork, the second universal joint fork and the fixing block are assembled together through press fitting, and the other end of the shaft is in interference fit with the fixing block. A bearing outer ring is in interference fit with bearing holes in the first universal fork and the second universal fork, a bearing cover is fixed to one side of the bearing by manually rotating a bolt, the bearing cover is used for protecting the internal bearing from being scratched and is installed as a beautiful appearance, and therefore it is guaranteed that no gap exists after assembly is completed, high precision is guaranteed, and the bearing is used for rotation and torque transmission; a ball bearing and interference fit are selected to guarantee large torque transmission.

Description

Technical Field

[0001] The utility model relates to the technical field of universal joints, in particular to a universal joint structure with high rotation accuracy. Background Art

[0002] In delta robots, universal joints can be used to transmit torque at different angles of the intermediate rotation axis, thereby achieving rotational motion at the end. The versatility and flexibility of universal joints make them an indispensable part of the manufacturing and automation fields.

[0003] Most of the existing universal joints use a cross bearing structure, which has gaps and cannot take into account both high rotation accuracy and high torque transmission. When ensuring high torque transmission, high rotation accuracy cannot be taken into account, and the two cannot be guaranteed to coexist. The utility model can ensure high rotation accuracy and high torque transmission, solving the pain points of current universal joints. Utility Model Content

[0004] The purpose of the utility model is to provide a universal joint structure with high rotation accuracy to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A universal joint structure with high rotation accuracy, comprising

[0007] A fixed block, wherein a first universal joint fork is clamped on one side of the outer surface of the fixed block, a second universal joint fork is clamped on the other side of the outer surface of the fixed block, four connecting slots are opened on one side of the fixed block, four shafts are clamped on the inner walls of the four connecting slots, one side of the four shafts is clamped with bearings, the outer surfaces of the four shafts are fixedly connected with bearing covers, one side of the bearing covers is opened with threaded holes, and bolts are threadedly connected to the inner walls of the threaded holes.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] 1. A universal joint structure with high rotation accuracy, which is provided with a fixed block, a first universal joint fork, a second universal joint fork, a shaft, a bearing, a bearing cover and bolts. When in use, the bearing is first assembled on the shaft by press-fitting, and then the first universal joint fork, the second universal joint fork and the fixed block are assembled together by press-fitting. The other end of the shaft and the fixed block are interference fit, and the outer ring of the bearing and the bearing holes on the first universal joint fork and the second universal joint fork are interference fit. The bolts are manually turned to fix the bearing cover on one side of the bearing. The bearing cover is used to protect the internal bearing from scratches and is installed for aesthetic purposes to ensure that there is no gap after assembly is completed and high precision is guaranteed. The bearing is used for rotation and torque transmission. Ball bearings and interference fit are selected to ensure large torque transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an overall schematic diagram of the utility model;

[0011] Figure 2 The utility model is a schematic diagram of the disassembly of the fixing block, shaft, bearing, bearing cover and bolts.

[0012] In the figure: 1, fixing block; 2, first universal joint fork; 3, second universal joint fork; 4, shaft; 5, bearing; 6, bearing cover; 7, bolt. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] See also Figure 1-Figure 2 As shown, a technical solution provided by the utility model:

[0015] A universal joint structure with high rotation accuracy, comprising

[0016] A fixing block 1 is provided, wherein a first universal joint fork is clamped on one side of the outer surface of the fixing block 1, and a second universal joint fork is clamped on the other side of the outer surface of the fixing block 1. Four connecting slots are provided on one side of the fixing block 1, and four shafts 4 are clamped on the inner walls of the four connecting slots. Bearings 5 ​​are clamped on one side of the four shafts 4, and bearing 5 covers are fixedly connected to the outer surfaces of the four shafts 4. A threaded hole is provided on one side of the bearing 5 cover, and bolts 7 are threadedly connected to the inner walls of the threaded holes. By setting the fixing block 1, the first universal joint fork, the second universal joint fork, the shaft 4, the bearing 5, the bearing cover 6 and the bolt 7, when in use, the bearing 5 is first pressed Assemble it on the shaft 4, and then assemble the first universal fork 2, the second universal fork 3 and the fixed block 1 together by press fitting. The other end of the shaft 4 and the fixed block 1 are interference fit, and the outer ring of the bearing 5 and the bearing holes on the first universal fork 2 and the second universal fork 3 are interference fit. Manually turn the bolt 7 to fix the bearing cover 6 on one side of the bearing 5. The bearing cover 6 is used to protect the internal bearing 5 from scratches and is installed for aesthetic purposes to ensure that there is no gap after the assembly is completed to ensure high precision. The bearing 5 is used for rotation and torque transmission. Ball bearings 5 ​​and interference fit are selected to ensure large torque transmission.

[0017] When a universal joint structure with high rotation accuracy is used in this embodiment, the bearing 5 is first assembled on the shaft 4 by press-fitting, and then the first universal fork 2, the second universal fork 3 and the fixed block 1 are assembled together by press-fitting. The other end of the shaft 4 and the fixed block 1 are interference fit, and the outer ring of the bearing 5 and the bearing holes on the first universal fork 2 and the second universal fork 3 are interference fit. The bolt 7 is manually turned to fix the bearing cover 6 on one side of the bearing 5. The bearing cover 6 is used to protect the internal bearing 5 from scratches and is installed for aesthetic purposes to ensure that there is no gap after the assembly is completed to ensure high accuracy. The bearing 5 is used for rotation and torque transmission. Ball bearings 5 ​​and interference fit are selected to ensure large torque transmission.

[0018] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A universal joint structure with high rotation accuracy, characterized in that: include A fixing block (1), wherein a first universal joint fork is clamped on one side of an outer surface of the fixing block (1), and a second universal joint fork is clamped on the other side of an outer surface of the fixing block (1); four connecting slots are provided on one side of the fixing block (1), and four shafts (4) are clamped on the inner walls of the four connecting slots; bearings (5) are clamped on one side of the four shafts (4); bearing caps (6) are fixedly connected to the outer surfaces of the four shafts (4); a threaded hole is provided on one side of the bearing cap (6), and a bolt (7) is threadedly connected to the inner wall of the threaded hole.

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