Shaft sleeve connecting structure

Abstract

The shaft sleeve connecting structure comprises a shaft body, a sleeve body and a connecting key, the shaft body is provided with a first key groove, and the first key groove is provided with a first groove wall and a second groove wall which are oppositely arranged; the shaft body is sleeved with the sleeve body, the sleeve body is provided with a second key groove, and the second key groove is provided with a third groove wall and a fourth groove wall which are oppositely arranged; one part of the connecting key is embedded into the first key groove, and the other part of the connecting key is embedded into the second key groove; the first groove wall and the second groove wall are gradually away from each other from inside to outside in the radial direction of the shaft body, and the third groove wall and the fourth groove wall are gradually away from each other from outside to inside in the radial direction of the sleeve body. According to the shaft sleeve connecting structure, the contact area between the first key groove and the connecting key and the contact area between the second key groove and the connecting key can be increased, and therefore the probability that the connecting key, the first key groove and the second key groove are damaged is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of shaft sleeve transmission structures, and in particular to a shaft sleeve connection structure. Background Art

[0002] Flat keys are commonly used connectors in mechanical design, mainly used to transmit torque between shafts and parts on the shaft (such as pulleys, gears, wheels, sprockets, etc.). For mechanical equipment in coal mines, quarries and other scenes, the torque required to be transmitted is large, and the working environment is harsh, which makes flat keys and keyways easily damaged. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a shaft sleeve connection structure, which can increase the contact area between the first keyway and the second keyway and the connecting key, thereby reducing the probability of damage to the connecting key, the first keyway and the second keyway.

[0005] The shaft sleeve connection structure of the embodiment of the present invention includes a shaft body, a sleeve body and a connecting key, the shaft body having a first keyway, the first keyway having a first groove wall and a second groove wall arranged oppositely; the sleeve body is sleeved on the shaft body, the sleeve body having a second keyway, the second keyway having a third groove wall and a fourth groove wall arranged oppositely; a part of the connecting key is engaged with the first keyway, and the other part is engaged with the second keyway; wherein, the first groove wall and the second groove wall gradually move away from each other from the inside to the outside along the radial direction of the shaft body, and the third groove wall and the fourth groove wall gradually move away from each other from the outside to the inside along the radial direction of the sleeve body.

[0006] In some embodiments, the connecting key has a first working surface and a second working surface arranged relatively to each other, and a third working surface and a fourth working surface arranged relatively to each other, the first working surface fits the first groove wall, the second working surface fits the second groove wall, the third working surface fits the third groove wall, and the fourth working surface fits the fourth groove wall; the first working surface intersects with the third working surface to form a first outer edge line, the first groove wall intersects with the third groove wall to form a first inner edge line, and the first outer edge line coincides with the first inner edge line; the second working surface and the fourth working surface form a second outer edge line, the second groove wall and the fourth groove wall form a second inner edge line, and the second outer edge line coincides with the second inner edge line.

[0007] In some embodiments, the first working surface and the third working surface form a first working angle, and the first working angle is 90° to 120°; and / or the second working surface and the fourth working surface form a second working angle, and the second working angle is 90° to 120°.

[0008] In some embodiments, the first working surface and the second working surface are symmetrically arranged along the circumference of the shaft body, and the third working surface and the fourth working surface are symmetrically arranged along the circumference of the shaft body.

[0009] In some embodiments, a first connecting surface is provided between the first working surface and the second working surface, the first connecting surface and the first working surface form a first angle, the first connecting surface and the second working surface form a second angle, and the first angle is equal to the second angle; and / or

[0010] A second connecting surface is provided between the third working surface and the fourth working surface, the second connecting surface forms a third angle with the third working surface, the second connecting surface forms a fourth angle with the fourth working surface, and the third angle is equal to the fourth angle.

[0011] In some embodiments, the connecting key includes a base and four working parts, the four working parts respectively have the first working surface, the second working surface, the third working surface and the fourth working surface, and the working parts are detachably connected to the base.

[0012] In some embodiments, the base is provided with a first clamping structure, the working part is provided with a second clamping structure, and the first clamping structure is clamped and matched with the second clamping structure.

[0013] In some embodiments, a clamping block is slidably connected to the base, the working part has a clamping slot, the clamping block is clamped and matched with the clamping slot, the clamping block forms the first clamping structure, and the clamping slot forms the second clamping structure.

[0014] In some embodiments, there are multiple card blocks, at least one of which is a first card block, and at least one of which is a second card block, and the first card block and the second card block are arranged to slide relative to each other; the connecting key also includes a fixing member, and the fixing member is detachably arranged between the first card block and the second card block so that the first card block and the second card block are both engaged with the card slot.

[0015] In some embodiments, the connecting key further comprises an elastic member, wherein the elastic member is disposed between the clamping block and the base, and the elastic member is used to apply an elastic force to the clamping block toward the fixing member.

[0016] The shaft sleeve connection structure of the embodiment of the present invention is suitable for mechanical equipment in coal mines, quarries, etc. Among them, the first groove wall and the second groove wall are arranged relatively inclined, and the third groove wall and the fourth groove wall are also arranged relatively inclined, which can increase the area of ​​the first groove wall, the second groove wall, the third groove wall and the fourth groove wall, and then increase the force-bearing area of ​​the connecting key, so that the connection between the connecting key and the shaft body and the sleeve body is more firm, and a larger torque can be transmitted, thereby reducing the probability of damage to the connecting key when transmitting a large torque.

[0017] In addition, since the first groove wall and the second groove wall gradually move away from the inside to the outside along the radial direction of the shaft body, and the third groove wall and the fourth groove wall gradually move away from the outside to the inside along the radial direction of the sleeve body, the keyway angle of the first keyway and the keyway angle of the second keyway can be increased, thereby weakening the stress concentration at the keyway angle of the first keyway and the keyway angle of the second keyway, thereby reducing the probability of damage to the keyway angles of the first keyway and the second keyway. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a shaft sleeve connection structure according to an embodiment of the present invention.

[0019] Figure 2 It is a cross-sectional schematic diagram of a shaft sleeve connection structure according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic structural diagram of a shaft body of a shaft sleeve connection structure according to an embodiment of the present invention.

[0021] Figure 4 It is a structural schematic diagram of a sleeve body of a shaft-sleeve connection structure according to an embodiment of the present invention.

[0022] Figure 5 It is a schematic structural diagram of a connecting key of a shaft sleeve connecting structure according to another embodiment of the present invention.

[0023] Figure 6 yes Figure 5 A magnified schematic diagram of center A.

[0024] Figure 7 It is a partial cross-sectional view of a shaft sleeve connection structure according to another embodiment of the present invention.

[0025] 1. Axle body; 11. First keyway; 111. First groove wall; 112. Second groove wall; 2. Sleeve body; 21. Second keyway; 211. Third groove wall; 212. Fourth groove wall; 3. Connecting key; 31. First working surface; 311. First outer edge line; 32. Second working surface; 321. Second outer edge line; 33. Third working surface; 34. Fourth working surface; 35. First connecting surface; 36. Second connecting surface; 37. Base body; 371. Mounting groove; 38. Working part; 381. Clamping groove; 3811. First groove; 3812. Second groove; 41. First clamping block; 411. Protrusion; 42. Second clamping block; 43. First cavity; 5. Fixing member; 6. Elastic member. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] like Figures 1 to 4 As shown, the shaft sleeve connection structure 100 of the embodiment of the present invention includes a shaft body 1, a sleeve body 2 and a connecting key 3, the shaft body 1 has a first key groove 11, the first key groove 11 has a first groove wall 111 and a second groove wall 112 arranged oppositely; the sleeve body 2 is sleeved on the shaft body 1, the sleeve body 2 has a second key groove 21, the second key groove 21 has a third groove wall 211 and a fourth groove wall 212 arranged oppositely; a part of the connecting key 3 is engaged with the first key groove 11, and the other part is engaged with the second key groove 21; wherein, the first groove wall 111 and the second groove wall 112 gradually move away from each other from the inside to the outside along the radial direction of the shaft body 1, and the third groove wall 211 and the fourth groove wall 212 gradually move away from each other from the outside to the inside along the radial direction of the sleeve body 2.

[0028] The shaft sleeve connection structure 100 of the embodiment of the present invention is suitable for mechanical equipment in coal mines, quarries, etc. Among them, the first groove wall 111 and the second groove wall 112 are arranged relatively tilted, and the third groove wall 211 and the fourth groove wall 212 are also arranged relatively tilted, which can increase the area of ​​the first groove wall 111, the second groove wall 112, the third groove wall 211 and the fourth groove wall 212, thereby increasing the force-bearing area of ​​the connecting key 3, making the connection between the connecting key 3 and the shaft body 1 and the sleeve body 2 more firmly, and can transmit a larger torque, thereby reducing the probability of damage to the connecting key 3 when transmitting a large torque.

[0029] In addition, since the first groove wall 111 and the second groove wall 112 gradually move away from the inside to the outside along the radial direction of the shaft body 1, and the third groove wall 211 and the fourth groove wall 212 gradually move away from the outside to the inside along the radial direction of the sleeve body 2, the keyway angle of the first keyway 11 and the keyway angle of the second keyway 21 can be increased, thereby weakening the stress concentration at the keyway angle of the first keyway 11 and the keyway angle of the second keyway 21, thereby reducing the probability of damage to the keyway angles of the first keyway 11 and the second keyway 21.

[0030] It is understandable that if Figure 3 and Figure 4 As shown, the keyway angle of the first keyway 11 refers to the two angles α formed by the first groove wall 111, the second groove wall 112 and the outer side surface of the shaft body 1, and the keyway angle of the second keyway 21 refers to the two angles β formed by the third groove wall 211, the fourth groove wall 212 and the inner side surface of the sleeve body 2.

[0031] It can be understood that the torque is transmitted between the shaft body 1 and the sleeve body 2 via the connecting key 3, and the sleeve body 2 is various parts matched with the shaft body 1, such as pulleys, gears, pairs of wheels, sprockets, etc.

[0032] In some embodiments, Figure 2 and Figure 3 As shown, the connecting key 3 has a first working surface 31 and a second working surface 32 arranged opposite to each other, and a third working surface 33 and a fourth working surface 34 arranged opposite to each other, the first working surface 31 fits the first groove wall 111, the second working surface 32 fits the second groove wall 112, the third working surface 33 fits the third groove wall 211, and the fourth working surface 34 fits the fourth groove wall 212; the first working surface 31 and the third working surface 33 intersect to form a first outer edge line 311, the first groove wall 111 and the third groove wall 211 intersect to form a first inner edge line, and the first outer edge line 311 coincides with the first inner edge line; the second working surface 32 and the fourth working surface 34 form a second outer edge line 321, the second groove wall 112 and the fourth groove wall 212 form a second inner edge line, and the second outer edge line 321 coincides with the second inner edge line.

[0033] It is known that during the process of transmitting torque between the shaft body 1 and the sleeve body 2, the sleeve body 2 and the shaft body 1 respectively apply forces in opposite directions to the connecting key 3, causing the connecting key 3 to have a tendency to shear deformation; at the same time, the connecting key 3 applies pressure to the tip of the keyway angle of the first keyway 11 and the tip of the keyway angle of the second keyway 21, which can easily cause damage to the keyway angles of the first keyway 11 and the second keyway 21.

[0034] Through the above arrangement, the connecting key 3 is in surface contact with the first key groove 11 and the second key groove 21. At the same time, the first outer edge 311 coincides with the first inner edge, and the second outer edge 321 coincides with the second inner edge. When the connecting key 3 is subjected to shear force, the connecting key 3 tends to be shear-deformed along the position from the first outer edge 311 to the second outer edge 321. Since the dimension from the first outer edge 311 to the second outer edge 321 is the maximum dimension of the cross section of the connecting key 3 along the circumference of the shaft body 1, the connecting key 3 is not easy to be shear-deformed at this position. In other words, the connecting key 3 has a strong ability to resist shear deformation, thereby reducing the risk of shear deformation of the connecting key 3.

[0035] In some embodiments, Figure 2 As shown, the first working surface 31 and the third working surface 33 form a first working angle of 90° to 120°; and / or the second working surface 32 and the fourth working surface 34 form a second working angle of 90° to 120°.

[0036] By limiting the range of the first working angle and the second working angle, the inclinations of the first working surface 31, the second working surface 32, the third working surface 33 and the fourth working surface 34 can be limited, thereby appropriately increasing the contact area between the connecting key 3 and the first key groove 11 and the second key groove 21, thereby improving the connection stability between the connecting key 3 and the shaft body 1 and the sleeve body 2, and reducing the probability of damage to the connecting key 3, the first key groove 11 and the second key groove 21.

[0037] Preferably, the first working angle and the second working angle are both 90°.

[0038] In some embodiments, Figure 2 As shown, the first working surface 31 and the second working surface 32 are symmetrically arranged along the circumference of the shaft body 1 , and the third working surface 33 and the fourth working surface 34 are symmetrically arranged along the circumference of the shaft body 1 .

[0039] Through the above arrangement, the connection key 3 is symmetrically structured along the circumference of the shaft body 1, so that the shaft sleeve connection structure 100 is evenly stressed when transmitting positive torque and reverse torque.

[0040] In some embodiments, Figure 2 As shown, a first connecting surface 35 is provided between the first working surface 31 and the second working surface 32, the first connecting surface 35 forms a first angle with the first working surface 31, the first connecting surface 35 forms a second angle with the second working surface 32, and the first angle is equal to the second angle; and / or a second connecting surface 36 is provided between the third working surface 33 and the fourth working surface 34, the second connecting surface 36 forms a third angle with the third working surface 33, the second connecting surface 36 forms a fourth angle with the fourth working surface 34, and the third angle is equal to the fourth angle.

[0041] Through the above settings, the first working surface 31 and the second working surface 32 are transitionally connected through the first connecting surface 35, and the third working surface 33 and the fourth working surface 34 are transitionally connected through the second connecting surface 36, which can reduce the stress concentration degree at both ends of the connecting key 3 along the radial direction of the shaft body 1; in addition, by setting the first connecting surface 35 and the second connecting surface 36, the cross-section of the connecting key 3 is hexagonal, which changes the force angle of the connecting key 3 and increases the force area of ​​the connecting key 3, thereby improving the strength of the connecting key 3 and reducing the probability of damage to the connecting key 3.

[0042] As an example, Figure 2 As shown, the first working angle and the second working angle are both 90°. At this time, the first included angle, the second included angle, the third included angle and the fourth included angle are all 135°.

[0043] Of course, in other embodiments, the first working surface 31 and the second working surface 32 may be connected, and the third working surface 33 and the fourth working surface 34 may be connected. In this case, the cross section of the connecting key 3 is rhombus-shaped.

[0044] In some embodiments, Figure 5 As shown, the connecting key 3 includes a base body 37 and four working parts 38 . The four working parts 38 respectively have a first working surface 31 , a second working surface 32 , a third working surface 33 and a fourth working surface 34 . The working parts 38 are detachably connected to the base body 37 .

[0045] It is known that if the shaft body 1 and the sleeve body 2 rotate in only one direction, that is, the torque in only one direction is transmitted between the shaft body 1 and the sleeve body 2, the first working surface 31 and the fourth working surface 34 of the connecting key 3 are the main force-bearing surfaces or the second working surface 32 and the third working surface 33 are the main force-bearing surfaces. During long-term use, the parts that serve as the main force-bearing surfaces are prone to damage.

[0046] Through the above arrangement, when the main force-bearing surface of the connecting key 3 is damaged, the corresponding working part 38 can be replaced, thereby reducing the maintenance cost of the connecting key 3.

[0047] In some embodiments, Figure 6 As shown, the base 37 is provided with a first clamping structure, and the working portion 38 is provided with a second clamping structure, and the first clamping structure is clamped and matched with the second clamping structure.

[0048] The working part 38 is engaged with the base 37 in a snap-fit ​​manner, so that the assembly and disassembly operations of the connecting key 3 are more convenient, thereby making it easier to replace the working part 38 .

[0049] In some embodiments, Figure 6 and Figure 7As shown, a clamping block is slidably connected to the base 37, and the working portion 38 has a clamping slot 381. The clamping block and the clamping slot 381 are clamped together to form a first clamping structure, and the clamping slot 381 forms a second clamping structure.

[0050] The card block slides into the card slot 381 to achieve card engagement with the card slot 381 , thereby achieving connection between the working part 38 and the base 37 . The card block slides out of the card slot 381 to detach from the card slot 381 , thereby achieving disassembly of the working part 38 .

[0051] In some embodiments, Figure 7 As shown, there are multiple card blocks, at least one card block is a first card block 41, and at least one card block is a second card block 42, and the first card block 41 and the second card block 42 are arranged to slide relative to each other; the connecting key 3 also includes a fixing member 5, which is detachably arranged between the first card block 41 and the second card block 42, so that the first card block 41 and the second card block 42 are both engaged with the card slot 381.

[0052] Through the above arrangement, the fixing member 5 is placed between the first clamping block 41 and the second clamping block 42, so that the first clamping block 41 and the second clamping block 42 can be driven to be relatively far apart and respectively cooperate with the corresponding clamping groove 381, thereby realizing a stable connection between the working part 38 and the base 37; after the fixing member 5 is removed, the first clamping block 41 and the second clamping block 42 can be relatively close to each other, so that the first clamping block 41 and the second clamping block 42 are both separated from the clamping groove 381, thereby realizing the disassembly of the working part 38, and the operation is more convenient.

[0053] As an example, Figure 6 and Figure 7 As shown, the base 37 is cylindrical and extends along the length direction of the connecting key 3. The four connecting parts are symmetrically installed along the circumference of the base 37. Each connecting part corresponds to a group of card blocks. The four groups of card blocks are evenly arranged along the circumference of the base 37. The number of card blocks in each group is two, which are the above-mentioned first card block 41 and the second card block 42.

[0054] The side of the connecting portion close to the base 37 is its inner side, and the inner side of the connecting portion is in a 1 / 4 arc shape so as to cooperate with the base 37; the inner side of the connecting portion has the above-mentioned groove 381, and the cross-section of the groove 381 is T-shaped to form a first groove 3811 and a second groove 3812 arranged relatively along the circumference of the base 37; the outer side of the base 37 has a mounting groove 371 for mounting the first clamping block 41 and the second clamping block 42, and the first clamping block 41 and the second clamping block 42 are slidably mounted in the mounting groove 371 along a direction perpendicular to the radius of the base 37, and the first clamping block 41 and the second clamping block 42 have a protrusion 411 on the side relatively far away from each other. When the first clamping block 41 and the second clamping block 42 are relatively far away, the protrusion 411 of the first clamping block 41 is inserted into the first groove 3811, and the protrusion 411 of the second clamping block 42 is inserted into the second groove 3812, so that the connection between the connecting portion and the base 37 can be realized.

[0055] When the first block 41 and the second block 42 are relatively close, the first block 41 and the second block 42 abut against each other. At this time, the distance between the two relatively far sides of the first block 41 and the second block 42 is smaller than the minimum distance between the slot 381 along the circumference of the base 37, so that the working part 38 can fit in or detach from the base 37 along the radial direction of the base 37.

[0056] The sides of the first clamping block 41 and the second clamping block 42 that are close to each other are both inclined surfaces, and the inclined surfaces of the first clamping block 41 and the second clamping block 42 gradually approach each other from the inside to the outside along the radial direction of the base 37; when the first clamping block 41 and the second clamping block 42 are abutted, the inclined surfaces of the first clamping block 41, the inclined surfaces of the second clamping block 42 and the groove wall of the installation groove 371 form a first cavity 43 with a triangular cross section, and when the first clamping block 41 and the second clamping block 42 are clamped in the clamping groove 381, the inclined surfaces of the first clamping block 41, the inclined surfaces of the second clamping block 42, the groove wall of the installation groove 371 and the groove wall of the clamping groove 381 form a second cavity with an isosceles trapezoidal cross section.

[0057] The fixing member 5 is in the shape of a long strip arranged along the axial direction of the base 37, and the cross-section of the fixing member 5 is the same shape and equal in size to the cross-section of the second cavity; after the working portion 38 is connected to the base 37, the first clamping block 41 and the second clamping block 42 are both matched with the fixing member 5 through the inclined surface, thereby making the overall structure of the connecting key 3 more stable, and the stability is higher during the process of the connecting key 3 transmitting torque.

[0058] When assembling the working part 38 and the base 37, first align the slot 381 of the working part 38 with the block, and gradually fit the working part 38 to the base 37 along the radial direction of the base 37, and then gradually insert the fixing member 5 between the first block 41 and the second block 42 along the axial direction of the base 37, so that the first block 41 and the second block 42 are respectively engaged in the first groove 3811 and the second groove 3812, thereby realizing the assembly of the connecting key 3.

[0059] In addition, during the installation of the above-mentioned working part 38, it is only necessary to apply a force to the fixing member 5 when the fixing member 5 is inserted between the first block 41 and the second block 42, and there is no need to apply force directly to the working part 38, thereby reducing the probability of damage to the working part 38 during the assembly of the connecting key 3, and ensuring the flatness and integrity of the first working surface 31, the second working surface 32, the third working surface 33 and the fourth working surface 34.

[0060] Optionally, a chamfer is provided at the end of the fixing member 5 , thereby making it easier to insert the fixing member 5 into the first cavity 43 .

[0061] Alternatively, if Figure 5 and Figure 6 As shown, the end surface of the fixing member 5 has a threaded hole. Therefore, the fixing member 5 can be disassembled with the help of tools, which improves the convenience of operation.

[0062] In some embodiments, Figure 7 As shown, the connecting key 3 further includes an elastic member 6 , which is disposed between the clamping block and the base 37 , and is used to apply an elastic force to the clamping block toward the fixing member 5 .

[0063] During the installation process of the working part 38, when the fixing member 5 is not inserted between the first clamping block 41 and the second clamping block 42, the first clamping block 41 and the second clamping block 42 abut against each other under the action of the elastic member 6, and the working part 38 can be directly attached to the base body 37 along the radial direction of the base body 37; similarly, during the disassembly process of the working part 38, after the fixing member 5 is pulled out from between the first clamping block 41 and the second clamping block 42, the first clamping block 41 and the second clamping block 42 can automatically approach each other under the action of the elastic member 6, and the working part 38 can be separated from the base body 37 along the radial direction of the base body 37; thereby, the convenience of installation and disassembly of the working part 38 can be improved.

[0064] Optionally, the elastic member 6 is a spring, and two ends of the spring are respectively connected to the groove wall and the block of the installation groove 371.

[0065] As an example, Figure 7 As shown, a spring is provided on the relatively far sides of the first clamping block 41 and the second clamping block 42, and the first clamping block 41 and the second clamping block 42 can be relatively close to each other under the action of the spring.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A shaft sleeve connection structure (100), characterized in that: include: A shaft body (1), the shaft body (1) having a first key groove (11), the first key groove (11) having a first groove wall (111) and a second groove wall (112) arranged opposite to each other; A sleeve body (2), the sleeve body (2) being sleeved on the shaft body (1), the sleeve body (2) having a second key groove (21), the second key groove (21) having a third groove wall (211) and a fourth groove wall (212) arranged opposite to each other; A connecting key (3), a portion of the connecting key (3) being engaged with the first key groove (11), and another portion of the connecting key (3) being engaged with the second key groove (21); The first groove wall (111) and the second groove wall (112) gradually move away from each other from inside to outside along the radial direction of the shaft body (1), and the third groove wall (211) and the fourth groove wall (212) gradually move away from each other from outside to inside along the radial direction of the sleeve body (2).

2. The shaft sleeve connection structure (100) according to claim 1, characterized in that: The connecting key (3) comprises a first working surface (31) and a second working surface (32) which are arranged opposite to each other, and a third working surface (33) and a fourth working surface (34) which are arranged opposite to each other, wherein the first working surface (31) is in contact with the first groove wall (111), the second working surface (32) is in contact with the second groove wall (112), the third working surface (33) is in contact with the third groove wall (211), and the fourth working surface (34) is in contact with the fourth groove wall (212); The first working surface (31) and the third working surface (33) intersect to form a first outer edge line (311), the first groove wall (111) and the third groove wall (211) intersect to form a first inner edge line, and the first outer edge line (311) coincides with the first inner edge line; The second working surface (32) and the fourth working surface (34) form a second outer edge line (321), the second groove wall (112) and the fourth groove wall (212) form a second inner edge line, and the second outer edge line (321) coincides with the second inner edge line.

3. The shaft sleeve connection structure (100) according to claim 2, characterized in that: The first working surface (31) and the third working surface (33) form a first working angle, and the first working angle is 90° to 120°; and / or The second working surface (32) and the fourth working surface (34) form a second working angle, and the second working angle is 90° to 120°.

4. The shaft sleeve connection structure (100) according to claim 2, characterized in that: The first working surface (31) and the second working surface (32) are symmetrically arranged along the circumference of the shaft body (1), and the third working surface (33) and the fourth working surface (34) are symmetrically arranged along the circumference of the shaft body (1).

5. The shaft sleeve connection structure (100) according to claim 2, characterized in that: A first connecting surface (35) is provided between the first working surface (31) and the second working surface (32), the first connecting surface (35) and the first working surface (31) form a first angle, the first connecting surface (35) and the second working surface (32) form a second angle, the first angle and the second angle being equal; and / or A second connecting surface (36) is provided between the third working surface (33) and the fourth working surface (34); the second connecting surface (36) and the third working surface (33) form a third angle; the second connecting surface (36) and the fourth working surface (34) form a fourth angle; the third angle is equal to the fourth angle.

6. The shaft sleeve connection structure (100) according to any one of claims 2 to 5, characterized in that: The connecting key (3) comprises a base (37) and four working parts (38), wherein the four working parts (38) respectively have the first working surface (31), the second working surface (32), the third working surface (33) and the fourth working surface (34), and the working parts (38) are detachably connected to the base (37).

7. The shaft sleeve connection structure (100) according to claim 6, characterized in that: The base (37) is provided with a first clamping structure, the working portion (38) is provided with a second clamping structure, and the first clamping structure is clamped and matched with the second clamping structure.

8. The shaft sleeve connection structure (100) according to claim 7, characterized in that: A clamping block is slidably connected to the base (37), the working portion (38) has a clamping slot (381), the clamping block is clamped and matched with the clamping slot (381), the clamping block forms the first clamping structure, and the clamping slot (381) forms the second clamping structure.

9. The shaft sleeve connection structure (100) according to claim 8, characterized in that: There are multiple card blocks, at least one of which is a first card block (41), and at least one of which is a second card block (42), and the first card block (41) and the second card block (42) are arranged to slide relative to each other; The connecting key (3) further comprises a fixing member (5), wherein the fixing member (5) is detachably arranged between the first card block (41) and the second card block (42), so that the first card block (41) and the second card block (42) are both engaged with the card slot (381).

10. The shaft sleeve connection structure (100) according to claim 9, characterized in that: The connecting key (3) further comprises an elastic member (6), wherein the elastic member (6) is arranged between the clamping block and the base (37), and the elastic member (6) is used to apply an elastic force to the clamping block towards the fixing member (5).

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