Pipe assembly for flexible shaft and flexible shaft

Abstract

The utility model provides a pipe assembly for a flexible shaft. The pipe assembly for the flexible shaft comprises a first pipe fitting, connecting pieces are arranged at the two ends of the first pipe fitting in the axial direction, a second pipe fitting is arranged on the outer circumferential walls of the two connecting pieces in a sleeved mode, and a first groove extending in the circumferential direction of the second pipe fitting is formed in the inner circumferential wall of the second pipe fitting. The outer circumferential wall of the connecting piece is provided with a first protrusion extending in the circumferential direction of the connecting piece and matched with the groove, and / or the inner circumferential wall of the second pipe fitting is provided with a second protrusion extending in the circumferential direction of the second pipe fitting, and the outer circumferential wall of the connecting piece is provided with a second groove extending in the circumferential direction of the connecting piece and matched with the second protrusion. Therefore, according to the pipe assembly for the flexible shaft, the problem of loosening between the second pipe fitting and the connecting piece can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to soft axle technical field especially relates to a pipe assembly for soft axle and soft axle. BACKGROUND

[0002] In daily life, soft axle is common transmission tool, and the soft axle usually includes pipe assembly and transmission shaft arranged in the pipe assembly, and the pipe assembly usually includes metal hose, metal shell and connecting piece connecting the metal hose and the metal shell.

[0003] In the related art, the metal shell and the connecting piece are usually connected by using the rivet pressing technology, and the connection mode is prone to cause the metal shell and the connecting piece to be loose, and even the metal shell is detached from the connecting piece. SUMMARY

[0004] The utility model discloses a pipe assembly for soft axle to solve the problem that the second pipe piece and the connecting piece are prone to be loose in the related art.

[0005] The pipe assembly for soft axle of the utility model embodiment includes:

[0006] The first pipe piece is equipped with connecting piece on both ends in its axial direction,

[0007] The outer peripheral wall of at least one of the two connecting pieces is sleeved with the second pipe piece,

[0008] The inner peripheral wall of the second pipe piece is equipped with the first recess extending along its circumferential direction, and the outer peripheral wall of the connecting piece is equipped with the first protrusion extending along its circumferential direction and matched with the recess, and / or,

[0009] The inner peripheral wall of the second pipe piece is equipped with the second protrusion extending along its circumferential direction, and the outer peripheral wall of the connecting piece is equipped with the second recess extending along its circumferential direction and matched with the second protrusion.

[0010] The pipe assembly for soft axle of the utility model embodiment sets the first protrusion and the first recess between the connecting piece and the second pipe piece, or sets the second protrusion and the second recess, or sets the first protrusion and the first recess and the second protrusion or the second recess simultaneously, and the second pipe piece and the connecting piece can be clamped and fixed through the cooperation of the above-mentioned protrusion and recess, compared with the connection mode of the rivet pressing in the related art, the problem that the second pipe piece and the connecting piece are loose can be avoided.

[0011] Therefore, the pipe assembly for soft axle of the utility model embodiment can avoid the problem that the second pipe piece and the connecting piece are loose.

[0012] In some embodiments, the first recess is single, and the first protrusion is single.

[0013] The first recesses are multiple, and the multiple first recesses are arranged along the axial direction of the second pipe fitting; the first protrusions are multiple, and the multiple first protrusions are arranged along the axial direction of the connecting piece.

[0014] In some embodiments, the second recess is single, and the second protrusion is single; or

[0015] The second recesses are multiple, and the multiple first recesses are arranged along the axial direction of the connecting piece; the first protrusions are multiple, and the multiple first protrusions are arranged along the axial direction of the second pipe fitting.

[0016] In some embodiments, the inner circumferential wall of the second pipe fitting is provided with a third recess extending in the radial direction thereof, the outer circumferential wall of the connecting piece is provided with a third protrusion extending in the radial direction thereof and matched with the third recess, and / or,

[0017] The inner circumferential wall of the second pipe fitting is provided with a fourth protrusion extending in the radial direction thereof, and the outer circumferential wall of the connecting piece is provided with a fourth recess extending in the radial direction thereof and matched with the fourth protrusion.

[0018] In some embodiments, the third recess is single, and the third protrusion is single; or

[0019] The third recesses are multiple, and the multiple third recesses are arranged along the circumferential direction of the inner circumferential wall of the second pipe fitting; the third protrusions are multiple, and the multiple third protrusions are arranged along the circumferential direction of the outer circumferential wall of the connecting piece.

[0020] In some embodiments, the fourth recess is single, and the fourth protrusion is single; or

[0021] The fourth recesses are multiple, and the multiple third recesses are arranged along the circumferential direction of the outer circumferential wall of the connecting piece; the third protrusions are multiple, and the multiple third protrusions are arranged along the circumferential direction of the inner circumferential wall of the second pipe fitting.

[0022] In some embodiments, the outer wall surface of the first pipe fitting is sleeved with a rubber tube.

[0023] In some embodiments, the outer wall surface of the second pipe fitting is provided with knurling.

[0024] The utility model also provides a flexible shaft.

[0025] The flexible shaft comprises:

[0026] The pipe assembly as described in the above embodiments;

[0027] A mandrel is disposed inside the first pipe fitting, and its two ends extend through connectors disposed at both ends of the first pipe fitting into the second pipe fitting.

[0028] One end of the mandrel is connected to a first transmission connector, and the end of the first transmission connector away from the mandrel extends out of the corresponding second tube.

[0029] The other end of the mandrel is connected to a second transmission connector, and the end of the second transmission connector away from the mandrel extends out of the corresponding second tube.

[0030] The flexible shaft of this utility model can transmit power between two ends that are not on the same axis. For example, the first transmission connector is connected to a screwdriver, and the second transmission connector is connected to a screw. The screwdriver can drive the spindle to rotate, thereby driving the screw to rotate. This allows for the disassembly and assembly of screws in locations where it is inconvenient to place the screwdriver, thus improving work efficiency.

[0031] The flexible shaft of this utility model embodiment also includes a spring, which is sleeved on the outside of the mandrel and disposed between the connector and the first transmission connector. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the flexible shaft tube assembly according to an embodiment of the present invention.

[0034] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0035] Figure 3 This is a cross-sectional view of the connection between the second pipe fitting and the connector in an embodiment of this utility model;

[0036] Figure 4 This is a cross-sectional view of the connection between the second pipe fitting and the connector according to another embodiment of the present invention.

[0037] In the picture:

[0038] 100. Tube assembly; 200. Flexible shaft;

[0039] 1. First pipe fitting;

[0040] 2. Connecting parts;

[0041] 3. First groove;

[0042] 4. First protrusion;

[0043] 5. Second groove;

[0044] 6. Second protrusion;

[0045] 7. The third groove;

[0046] 8. Fourth protrusion;

[0047] 9. Fourth groove;

[0048] 10. Mandrel;

[0049] 11. First transmission connecting component;

[0050] 12. Second transmission connecting component;

[0051] 13. Spring;

[0052] 14. Rubber hose.

[0053] 15. Second pipe fitting;

[0054] 16. Third protrusion. Detailed Implementation

[0055] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0056] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] It should be noted that the first pipe fitting 1 in this application corresponds to the first pipe fitting 1 in the background art, and the second pipe fitting 15 corresponds to the second pipe fitting 15 in the background art. They are not necessarily made of metal and should not be construed as a limitation on this utility model.

[0059] To address the problem of easy loosening between the second tube 15 and the connector 2 of the tube assembly of the flexible shaft 200 in the related technology.

[0060] This utility model provides a tube assembly 100 for a flexible shaft.

[0061] The flexible shaft tube assembly 100 of this utility model embodiment includes a first tube 1, with connectors 2 at both ends of the first tube 1 in the axial direction. A second tube 15 is sleeved on the outer peripheral wall of the two connectors 2. A first groove 3 extending circumferentially is provided on the inner peripheral wall of the second tube 15. A first protrusion 4 extending circumferentially and cooperating with the groove is provided on the outer peripheral wall of the connectors 2. And / or, a second protrusion 6 extending circumferentially is provided on the inner peripheral wall of the second tube 15, and a second groove 5 extending circumferentially and cooperating with the second protrusion 6 is provided on the outer peripheral wall of the connectors 2.

[0062] The flexible shaft tube assembly 100 of this utility model provides a first protrusion 4 and a first groove 3, or a second protrusion 6 and a second groove 5, or simultaneously provides the first protrusion 4, the first groove 3, and the second protrusion 6 or the second groove 5, through the cooperation of the above-mentioned protrusions and grooves, the second tube 15 and the connector 2 can be snapped and fixed. Compared with the connection method of riveting in related technologies, this can avoid the problem of the second tube 15 and the connector 2 becoming loose.

[0063] Therefore, the flexible shaft tube assembly 100 of this utility model embodiment can avoid the problem of loosening between the second tube 15 and the connector 2.

[0064] The following is in conjunction with the appendix Figures 1-4 This invention describes a flexible shaft tube assembly 100 according to an embodiment of the present invention.

[0065] like Figure 1As shown, the flexible shaft tube assembly 100 of this utility model embodiment includes a first tube 1 and a second tube 15. The first tube 1 is provided with connectors 2 at both ends in the axial direction. The second tube 15 is sleeved on the outer peripheral wall of the two connectors 2. That is to say, the function of the connectors 2 is to connect the second tube 15 of the first tube 1.

[0066] In practical applications, connector 2 can be connected to first pipe 1 by being inserted into the hose of connector 2, or it can be connected to first pipe 1 by being sleeved outside first pipe 1. The terms "insertion" and "sleeved" here only describe the positional relationship between connector 2 and first pipe 1, and do not restrict the processing and assembly process of connector 2 and first pipe 1.

[0067] For example, the connector 2 can be an injection molded part. The two ends of the first pipe 1 are arranged in the injection mold of the connector 2, and the connector 2 can be directly injection molded at both ends of the first pipe 1, thereby improving the connection strength between the first pipe 1 and the connector 2.

[0068] The inner peripheral wall of the second pipe fitting 15 is provided with a first groove 3 extending circumferentially therefrom, and the outer peripheral wall of the connector 2 is provided with a first protrusion 4 extending circumferentially therefrom and cooperating with the first groove 3, and / or,

[0069] The inner peripheral wall of the second pipe fitting 15 is provided with a second protrusion 6 extending circumferentially thereon, and the outer peripheral wall of the connector 2 is provided with a second groove 5 extending circumferentially thereon and cooperating with the second protrusion 6.

[0070] For example, the inner peripheral wall of the second pipe 15 is provided with a first groove 3 extending in its circumference, and the outer peripheral wall of the corresponding connector 2 is provided with a first protrusion 4 extending in its circumference and cooperating with the first groove 3.

[0071] For example, the inner peripheral wall of the second pipe 15 is provided with a second protrusion 6 extending circumferentially thereon, and the outer peripheral wall of the connector 2 is provided with a second groove 5 extending circumferentially thereon and cooperating with the second protrusion 6.

[0072] For example, the inner peripheral wall of the second pipe 15 is provided with a first groove 3 extending in its circumference, the outer peripheral wall of the connector 2 is provided with a first protrusion 4 extending in its circumference and cooperating with the first groove 3, the inner peripheral wall of the second pipe 15 is provided with a second protrusion 6 extending in its circumference, and the outer peripheral wall of the connector 2 is provided with a second groove 5 extending in its circumference and cooperating with the second protrusion 6.

[0073] By setting the connector 2 as an injection molded part, when assembling the second pipe 15 onto the connector 2, it is only necessary to fix the first pipe 1 with the connector 2, and then press the second pipe 15 onto the connector 2.

[0074] For example, as shown in the figure, a hand-operated press is used to install the second pipe fitting 15 onto the connector 2. First, the connector 2 and / or the first pipe fitting 1 are fixed on the clamp using a clamp. After aligning the second pipe fitting 15 with the connector 2, the lower pressure head of the hand-operated press is turned to apply downward pressure to the second pipe fitting 15, thereby assembling the second pipe fitting 15 onto the connector 2.

[0075] The flexible shaft tube assembly 100 of this utility model provides a first protrusion 4 and a first groove 3, or a second protrusion 6 and a second groove 5, or simultaneously provides the first protrusion 4, the first groove 3, and the second protrusion 6 or the second groove 5, through the cooperation of the above-mentioned protrusions and grooves, the second tube 15 and the connector 2 can be snapped and fixed. Compared with the connection method of riveting in related technologies, this can avoid the problem of the second tube 15 and the connector 2 becoming loose.

[0076] In some embodiments, the first groove 3 is a single entity, and the first protrusion 4 is a single entity;

[0077] By setting both the first groove 3 and the first protrusion 4 as a single unit, the processing difficulty of the connector 2 and the second pipe 15 can be reduced while meeting the connection requirements of the connector 2 and the second pipe 15.

[0078] In some embodiments, there are multiple first grooves 3, which are spaced apart along the axial direction of the second pipe 15; there are multiple first protrusions 4, which are spaced apart along the axial direction of the connector 2.

[0079] By setting multiple first grooves 3 and first protrusions 4, the connection strength between connector 2 and second pipe 15 can be further improved. In practical applications, they can be selected according to connection requirements.

[0080] In some embodiments, the second groove 5 is a single entity, and the second protrusion 6 is a single entity.

[0081] By setting both the second groove 5 and the second protrusion 6 as a single unit, the processing difficulty of the connector 2 and the second pipe 15 can be reduced while meeting the connection requirements of the connector 2 and the second pipe 15.

[0082] In some embodiments, there are multiple second grooves 5, and multiple first grooves 3 are spaced apart along the axial direction of the connector 2; there are multiple first protrusions 4, and multiple first protrusions 4 are spaced apart along the axial direction of the second tube 15.

[0083] By setting multiple second grooves 5 and second protrusions 6, the connection strength between connector 2 and second pipe 15 can be further improved. In practical applications, they can be selected according to connection requirements.

[0084] In some embodiments, the inner peripheral wall of the second pipe 15 is provided with a third groove 7 extending radially therefrom, and the outer peripheral wall of the connector 2 is provided with a third protrusion 16 extending radially therefrom and cooperating with the third groove 7, and / or,

[0085] The inner peripheral wall of the second pipe fitting 15 is provided with a fourth protrusion 8 extending radially therefrom, and the outer peripheral wall of the connector 2 is provided with a fourth groove 9 extending radially therefrom and cooperating with the fourth protrusion 8.

[0086] For example, the inner peripheral wall of the second pipe fitting 15 is provided with a third groove 7 extending radially therefrom, and the outer peripheral wall of the connector 2 is provided with a third protrusion 16 extending radially therefrom and cooperating with the third groove 7.

[0087] For example, the inner peripheral wall of the second pipe 15 is provided with a fourth protrusion 8 extending radially therefrom, and the outer peripheral wall of the connector 2 is provided with a fourth groove 9 extending radially therefrom and cooperating with the fourth protrusion 8.

[0088] For example, the inner peripheral wall of the second pipe fitting 15 is provided with a third groove 7 extending radially therefrom, the outer peripheral wall of the connector 2 is provided with a third protrusion 16 extending radially therefrom and cooperating with the third groove 7, the inner peripheral wall of the second pipe fitting 15 is provided with a fourth protrusion 8 extending radially therefrom, and the outer peripheral wall of the connector 2 is provided with a fourth groove 9 extending radially therefrom and cooperating with the fourth protrusion 8.

[0089] The flexible shaft tube assembly 100 of this utility model provides a third protrusion 16 and a third groove 7, or a fourth protrusion 8 and a fourth groove 9, or simultaneously provides the third protrusion 16 and the third groove 7 as well as the fourth protrusion 8 or the fourth groove 9, through the cooperation of the above-mentioned protrusions and grooves, the second tube 15 and the connector 2 can be further snapped and fixed, that is, the second tube 15 and the connector 2 can be snapped and fixed in the axial and circumferential directions. Compared with the connection method of riveting in related technologies, it can further avoid the problem of loosening of the second tube 15 and the connector 2.

[0090] In some embodiments, the third groove 7 is a single entity, and the third protrusion 16 is a single entity.

[0091] By setting both the third groove 7 and the third protrusion 16 as a single unit, the processing difficulty of the connector 2 and the second pipe 15 can be reduced while meeting the connection requirements of the connector 2 and the second pipe 15.

[0092] In some embodiments, there are multiple third grooves 7, which are spaced apart circumferentially along the inner peripheral wall of the second pipe 15; there are multiple third protrusions 16, which are spaced apart circumferentially along the outer peripheral wall of the connector 2.

[0093] By setting multiple third grooves 7 and third protrusions 16, the connection strength between connector 2 and second pipe 15 can be further improved. In practical applications, they can be selected according to connection requirements.

[0094] In some embodiments, the fourth groove 9 is a single unit, and the fourth protrusion 8 is a single unit.

[0095] By setting both the third groove 7 and the third protrusion 16 as a single unit, the processing difficulty of the connector 2 and the second pipe 15 can be reduced while meeting the connection requirements of the connector 2 and the second pipe 15.

[0096] In some embodiments, there are multiple fourth grooves 9, which are spaced apart circumferentially along the outer peripheral wall of the connector 2; there are multiple fourth protrusions 8, which are spaced apart circumferentially along the inner peripheral wall of the second tube 15.

[0097] By setting multiple fourth grooves 9 and fourth protrusions 8, the connection strength between connector 2 and second pipe 15 can be further improved. In practical applications, they can be selected according to connection requirements.

[0098] In some embodiments, a rubber tube 14 is fitted onto the outer wall of the first tube 1.

[0099] By sleeved with a rubber tube 14 on the outer wall of the first tube 1, the waterproof and oil-proof performance of the flexible shaft tube assembly 100 of this utility model embodiment can be improved.

[0100] Furthermore, both ends of the tubing 14 can be connected to the connector 2 respectively, as shown in the figure. Both ends of the tubing 14 can extend into the connector 2, which can further improve the waterproof and oil-proof performance of the flexible shaft tubing assembly 100 of this utility model embodiment.

[0101] It is understandable that the hose 14 can be injection molded together with the connector 2 onto the first fitting 1, that is, the first fitting 1 is arranged in the injection mold, which allows the hose 14 to be injection molded together with the connector 2 onto the first fitting 1, further reducing the processing difficulty.

[0102] In some embodiments, the outer wall surface of the second pipe 15 is provided with knurling.

[0103] By applying knurling to the outer wall surface of the second pipe fitting 15, the anti-slip performance of the second pipe fitting 15 can be improved.

[0104] This utility model also provides a flexible shaft 200.

[0105] like Figure 1 As shown, the flexible shaft 200 of this utility model embodiment includes the tube assembly and mandrel 10 as described in the above embodiment.

[0106] The mandrel 10 is disposed inside the first tube 1. Both ends of the mandrel 10 pass through the connectors 2 disposed at both ends of the first tube 1 and extend into the second tube 15. One end of the mandrel 10 is connected to the first transmission connector 11, and the end of the first transmission connector 11 away from the mandrel 10 extends out of the corresponding second tube 15. The other end of the mandrel 10 is connected to the second transmission connector 12, and the end of the second transmission connector 12 away from the mandrel 10 extends out of the corresponding housing.

[0107] The mandrel 10 can be made of steel wire rope, giving it a certain degree of flexibility and allowing it to be bent.

[0108] Understandably, on the one hand, since the connection between the first transmission connector 11 and the spindle 10 and the connection between the second transmission connector 12 are both located inside the second tube 15, the second tube 15 can protect the connection between the first transmission connector 11 and the spindle 10 and the connection between the second transmission connector 12, thus preventing damage to the connection between the first transmission connector 11 and the spindle 10 and the connection between the second transmission connector 12.

[0109] On the other hand, since part of the first transmission connector 11 and part of the second transmission connector 12 are concentrically positioned, the concentricity of the first transmission connector 11 and the second pipe 15 can prevent excessive offset of the first transmission connector 11 during rotation. Similarly, concentricity of the second transmission connector 12 and the second pipe 15 can prevent excessive offset of the second transmission connector 12 during rotation. At the same time, the gaps between the first transmission connector 11 and the second pipe 15, and between the second transmission connector 12 and the second pipe 15, should be set within a suitable range. Too large a gap will reduce the anti-offset effect of the second pipe 15, while too small a gap will easily cause excessive friction between the second pipe 15 and the first and second transmission connectors 11 and 12, affecting transmission.

[0110] The flexible shaft 200 of this utility model can transmit power between two ends that are not on the same axis. For example, the first transmission connector 11 is connected to a screwdriver, and the second transmission connector 12 is connected to a screw. The screwdriver can drive the spindle 10 to rotate, thereby driving the screw to rotate. This allows for the disassembly and assembly of screws in locations where it is inconvenient to place the screwdriver, thus improving work efficiency.

[0111] In some embodiments, the flexible shaft 200 of the present invention further includes a spring 13, which is sleeved on the outside of the spindle 10 and disposed between the connector 2 and the first transmission connector 11.

[0112] Furthermore, one end of the spring 13 abuts against the connector 2, and the other end of the spring 13 abuts against the first transmission connector 11.

[0113] By providing a spring 13 between the connector 2 and the first transmission connector 11, the exposed length of the first transmission connector 11 can be adjusted by pressing, which can easily meet different required lengths.

[0114] In some embodiments, the first transmission connector 11 is an external hexagonal connector; the second transmission connector 12 is an internal hexagonal connector.

[0115] Optionally, the second transmission connector 12 is a quick-release hexagonal socket connector. Quick-release hexagonal socket connectors are existing technology and will not be described in detail here. Of course, the types of the first transmission connector 11 and the second transmission connector 12 can be selected according to the actual transmission requirements.

[0116] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A tube assembly for a soft shaft, characterized by The utility model relates to a pipe assembly for flexible shaft, comprising: a first pipe (1) provided with a connecting piece (2) at each end thereof in the axial direction, a second pipe (15) sleeved on the outer peripheral wall of at least one of the connecting pieces (2), a first groove (3) extending along the circumferential direction of the inner peripheral wall of the second pipe (15) and a first protrusion (4) extending along the circumferential direction of the outer peripheral wall of the connecting piece (2) and matched with the first groove (3), and / or a second protrusion (6) extending along the circumferential direction of the inner peripheral wall of the second pipe (15) and a second groove (5) extending along the circumferential direction of the outer peripheral wall of the connecting piece (2) and matched with the second protrusion (6).

2. The soft shaft tube assembly of claim 1, wherein, The first groove (3) is single, and the first protrusion (4) is single; or The first groove (3) is multiple, and the multiple first grooves (3) are arranged at intervals in the axial direction of the second pipe (15); the first protrusion (4) is multiple, and the multiple first protrusions (4) are arranged at intervals in the axial direction of the connecting piece (2).

3. The soft shaft tube assembly of claim 1, wherein, The second groove (5) is single, and the second protrusion (6) is single; or The second groove (5) is multiple, and the multiple first grooves (3) are arranged at intervals in the axial direction of the connecting piece (2); the first protrusion (4) is multiple, and the multiple first protrusions (4) are arranged at intervals in the axial direction of the second pipe (15).

4. The tube assembly for a flexible shaft according to any one of claims 1 to 3, characterized in that The inner peripheral wall of the second pipe (15) is provided with a third groove (7) extending along the radial direction, and the outer peripheral wall of the connecting piece (2) is provided with a third protrusion (16) extending along the radial direction and matched with the third groove (7), and / or The inner peripheral wall of the second pipe (15) is provided with a fourth protrusion (8) extending along the radial direction, and the outer peripheral wall of the connecting piece (2) is provided with a fourth groove (9) extending along the radial direction and matched with the fourth protrusion (8).

5. The soft shaft tube assembly of claim 4, wherein, The third groove (7) is single, and the third protrusion (16) is single; or The third groove (7) is multiple, and the multiple third grooves (7) are arranged at intervals in the circumferential direction of the inner peripheral wall of the second pipe (15); the third protrusion (16) is multiple, and the multiple third protrusions (16) are arranged at intervals in the circumferential direction of the outer peripheral wall of the connecting piece (2).

6. The soft shaft tube assembly of claim 4, wherein, The fourth groove (9) is single, and the fourth protrusion (8) is single; or The fourth groove (9) is multiple, and the multiple third grooves (7) are arranged at intervals in the circumferential direction of the outer peripheral wall of the connecting piece (2); the third protrusion (16) is multiple, and the multiple third protrusions (16) are arranged at intervals in the circumferential direction of the inner peripheral wall of the second pipe (15).

7. The tube assembly for a flexible shaft according to claim 1, wherein The outer wall surface of the first pipe (1) is sleeved with a rubber tube (14).

8. The tube assembly for a flexible shaft according to claim 1, wherein The outer wall surface of the second pipe (15) is provided with knurling.

9. A flexible shaft characterized by, The utility model relates to a pipe assembly for flexible shaft, comprising: the pipe assembly for flexible shaft according to any one of claims 1-8; a mandrel (10) arranged in the first pipe (1), and the two ends of the mandrel (10) extend into the second pipe (15) through the connecting pieces (2) arranged at the two ends of the first pipe (1), respectively, One end of the mandrel (10) is connected with a first transmission connecting member (11), the first transmission connecting member (11) extends out from the one end of the mandrel (10) and corresponds to the second pipe member (15); The other end of the mandrel (10) is connected with a second transmission connecting member (12), the second transmission connecting member (12) extends out from the one end of the mandrel (10) and corresponds to the second pipe member (15).

10. The soft shaft of claim 9, wherein, A spring (13) is further included, the spring (13) is sleeved outside the mandrel (10), and the spring (13) is arranged between the connecting member (2) and the first transmission connecting member (11).

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