Connecting shaft sleeve for transmission shaft and speed reducer

Abstract

The utility model relates to the field of rod and wire short stress rolling mills, in particular to a transmission shaft and speed reducer connecting shaft sleeve which comprises a shaft sleeve body, one end of the shaft sleeve body is provided with a first round hole used for allowing an output shaft of a speed reducer to be inserted, and the other end of the shaft sleeve body is provided with a boss integrally formed with the shaft sleeve body. And a plurality of counterbores which are used for insertion of connecting pieces and are connected with an output shaft of the speed reducer are formed in the axial direction of the boss. The connecting shaft sleeve can be selectively connected with a standard transmission shaft flange, meanwhile, the stress area of a key between the transmission shaft flange and the connecting shaft sleeve is increased, and the possibility that a connecting bolt of the transmission shaft flange and the connecting shaft sleeve is fractured due to overlarge stress is reduced.

Description

Technical Field

[0001] This utility model relates to the field of short-stress rolling mills for bar and wire rods, and specifically to a connecting bushing between a drive shaft and a reducer. Background Technology

[0002] In short stress line rolling mills for bar and wire rod, the drive shaft is responsible for transmitting the power output from the reducer to the rolls to achieve the rolling of the bar and wire rod. The connecting bushing, as a key connecting component between the drive shaft and the reducer, directly affects the stability, reliability, and service life of the entire transmission system.

[0003] like Figure 1 and Figure 2 The structure of the existing connecting bushing is shown. Specifically, the inner hole of the drive shaft flange matches the boss of the connecting bushing. Both the inner wall of the drive shaft flange and the outer wall of the boss of the connecting bushing are machined with keyways. The drive shaft flange and the connecting bushing are connected together by a flat key and studs. The connecting bushing is connected to the output shaft of the reducer by a flat key and an interference fit. In a vertical rolling mill, a positioning baffle is usually installed at the end of the reducer shaft. The positioning baffle is located inside the connecting bushing and is connected and fixed to the output shaft of the reducer by bolts.

[0004] However, the above-mentioned connecting bushing has some shortcomings, as follows:

[0005] 1) In national standard drive shafts, the drive shaft flange is a standard part. Once the drive shaft specification is selected, its dimensions D, D1, and D2 are fixed values. However, the above-mentioned use of a bushing with a baffle connecting sleeve requires mounting holes on the connection surface between the bushing and the flange due to the installation of the positioning baffle. The standard drive shaft flange has a smaller pitch circle diameter and inner diameter of the bolt holes, i.e., smaller dimensions D1 and D2. In order to ensure the connection between the bushing and the drive shaft flange, the dimensions of the drive shaft flange must be increased, making it a non-standard flange, which is neither interchangeable nor increases costs.

[0006] 2) In actual use, after the rolling mill has been running for a long time, the keyway will wear wider and wider, and the clearance between the key and the bearing will increase. This will cause the bolts connecting the bushing and the transmission shaft flange to be subjected to increased shear force and break. In addition, the actual force-bearing length of the key is about 3 / 8 of the total length, and the torque transmitted is reduced compared with the transmission shaft of the same specification.

[0007] 3) The bushing and the reducer output shaft are interference fit. Although the connection is tight, installation and disassembly are difficult, and the machining accuracy requirements are extremely high, which increases the manufacturing cost and maintenance difficulty.

[0008] In view of the above, this utility model is hereby proposed. Utility Model Content

[0009] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a connecting bushing for a transmission shaft and a reducer.

[0010] The objective of this utility model is achieved through the following technical solution:

[0011] This utility model provides a drive shaft and reducer connecting bushing, including bushing body, one end of which is provided with a first circular hole for the output shaft of the reducer to be inserted, and the other end is provided with a boss integrally formed therewith, and a plurality of countersunk holes are provided along the axial direction of the boss for the insertion of connecting parts and connection with the output shaft of the reducer.

[0012] Furthermore, the outer diameter of the boss matches the inner diameter of the drive shaft flange so that it can be inserted into the drive shaft flange.

[0013] Furthermore, the outer wall of the boss is provided with a keyway for mounting a flat key.

[0014] Furthermore, a second circular hole is provided radially along the boss, and the second circular hole is coaxial with the first circular hole.

[0015] Furthermore, a threaded hole matching the transmission shaft flange is provided along the axial direction of the bushing body.

[0016] Furthermore, the connecting bushing is made of 42CrMo material.

[0017] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0018] This utility model provides a connecting bushing for a drive shaft and a reducer. The bushing body and the boss are integrally formed, and the reducer drive shaft is connected and fixed to the connecting bushing by bolts. The improvement principle is to make the positioning baffle and the connecting bushing into an integral structure, eliminating the need to avoid space for the separate installation of the positioning baffle.

[0019] The fact that space needs to be avoided for the installation of positioning baffles has many advantages. Specifically, the bushing body does not need to have a larger hole for the installation of positioning baffles, and the mating end face of the drive shaft flange does not need to be specially drilled. The drive shaft flange can be manufactured according to standards, ensuring interchangeability and reducing costs.

[0020] The mating end face of the drive shaft flange does not need to be drilled, which increases the force-bearing area of ​​the key between the drive shaft flange and the connecting bushing. The actual force-bearing length of the key is about 4 / 5 of the total length, which can transmit greater torque. At the same time, it reduces the possibility of the connecting bolts between the drive shaft flange and the connecting bushing breaking due to excessive force.

[0021] The connecting bushing is connected to the reducer output shaft with a flat key, and bolts are used to connect the connecting bushing and the end of the reducer output shaft into one piece. This structure allows the fit between the connecting bushing and the reducer output shaft to be appropriately loose, without requiring a large interference fit. Therefore, installation and disassembly are relatively convenient, and the processing and manufacturing costs are correspondingly reduced. Attached Figure Description

[0022] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A side view of the existing bushing with a baffle added for connection;

[0025] Figure 2 For along Figure 1 Sectional view of AA;

[0026] Figure 3 This is a side view of the connecting bushing of this utility model;

[0027] Figure 4 For along Figure 3 Sectional view of AA;

[0028] Figure 5 This is a cross-sectional view of the connecting bushing of this utility model.

[0029] Wherein: 1 is the bushing body; 2 is the boss; 11 is the first round hole; 21 is the countersunk hole. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses consistent with some aspects of this invention as detailed in the appended claims.

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Please see Figure 3 and Figure 4This utility model provides a drive shaft and reducer connecting bushing, including bushing body 1. One end of the bushing body 1 is provided with a first round hole 11 for the reducer output shaft to be inserted (the structure of this embodiment matches the structure of the reducer output shaft), and the other end is provided with a boss 2 integrally formed therewith. Along the axial direction of the boss 2, there are two symmetrical countersunk holes 21 for bolts to be inserted and connected to the reducer output shaft.

[0033] Furthermore, a second circular hole is provided radially along the boss 2, and the second circular hole is coaxial with the first circular hole 11. Specifically, the second circular hole is to prevent the formation of a closed space inside the connecting bushing when installing the reducer output shaft, which would prevent the output shaft from being installed.

[0034] Furthermore, the outer diameter of the boss 2 matches the inner diameter of the drive shaft flange so that it can be inserted into the drive shaft flange and serve as a limiting position.

[0035] Furthermore, the outer wall of the boss 2 is provided with a keyway for mounting a flat key.

[0036] Furthermore, a threaded hole matching the transmission shaft flange is provided along the axial direction of the bushing body 1.

[0037] Furthermore, a threaded hole matching the transmission shaft flange is provided along the axial direction of the bushing body 1.

[0038] Furthermore, the connecting bushing is made of 42CrMo material.

[0039] In this embodiment, the output shaft of the reducer is inserted into the first circular hole 11, and then bolts are used to connect and fix it to the end of the output shaft through the countersunk hole 21. This locks the connecting bushing to the reducer while meeting the axial positioning requirements in the vertical rolling mill line.

[0040] Keyways are provided on the outer wall of boss 2 and the inner wall of the drive shaft flange.

[0041] In this embodiment, the connection between the connecting bushing and the drive shaft flange remains unchanged. The connecting bushing is positioned by the inner hole of the drive shaft flange and the boss 2 of the connecting bushing, and then connected to the drive shaft flange by a flat key. Further, multiple bolts are used to securely connect the connecting bushing and the drive shaft flange.

[0042] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0043] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A bushing connecting a drive shaft and a reducer, characterized in that, Includes a bushing body (1), one end of which is provided with a first round hole (11) for inserting the output shaft of the reducer, and the other end is provided with a boss (2) integrally formed therewith, and a plurality of countersunk holes (21) are provided along the axial direction of the boss (2) for inserting a connector and connecting it to the output shaft of the reducer.

2. The drive shaft and reducer connecting bushing according to claim 1, characterized in that, The outer diameter of the boss (2) matches the inner diameter of the drive shaft flange so that it can be inserted into the drive shaft flange.

3. The drive shaft and reducer connecting bushing according to claim 1, characterized in that, The outer wall of the boss (2) is provided with a keyway for key assembly.

4. The drive shaft and reducer connecting bushing according to claim 1, characterized in that, A second circular hole is provided radially along the boss (2), and the second circular hole is coaxial with the first circular hole (11).

5. The drive shaft and reducer connecting bushing according to claim 1, characterized in that, A threaded hole matching the transmission shaft flange is provided along the axial direction of the bushing body (1).

6. The drive shaft and reducer connecting bushing according to claim 1, characterized in that, The connecting bushing is made of 42CrMo material.

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