A drive quick change device

Abstract

This utility model relates to the field of quick-change structure technology and discloses a driving quick-change device, including a fixed base with an annular sleeve inside. A first guide groove is provided on the side of the annular sleeve facing its axis. The quick-change assembly includes a first sleeve and a guide rod. Multiple balls are circumferentially spaced at the end of the first sleeve. A second guide groove is provided on the end of the guide rod inserted into the first sleeve. While driving the guide rod to move, the quick-change assembly is inserted into the fixed base. When the balls abut against the first guide groove, the quick-change assembly locks with the fixed base. When the balls fall into the second guide groove, the quick-change assembly unlocks from the fixed base. This utility model achieves quick locking and unlocking with the fixed base through the guide rod in the quick-change assembly. The guide rod cooperates with the first sleeve to achieve a self-centering function. The mechanical cooperation between the balls and the double annular grooves enables quick assembly and disassembly, reducing installation accuracy requirements. Simultaneously, the elastic element assists in resetting, reducing component wear and extending service life.

Description

Technical Field

[0001] This utility model relates to the field of quick-change structure technology, and in particular to a drive quick-change device. Background Technology

[0002] In the transmission system, power transmission between the drive shaft and the differential is achieved through a connecting device. The drive shaft has a drive shaft flange on one side and a mounting base on the other side of the differential. Usually, the drive shaft flange is connected to the mounting base. There are generally two connection methods. One method is to fix the drive shaft flange to the mounting base with multiple bolts. This requires the use of wrenches and other tools to tighten or loosen the bolts one by one. Although the structure is simple, disassembly and assembly are time-consuming, cumbersome, and inefficient. The bolts are also prone to rust or loosening, requiring regular maintenance. Repeated disassembly and assembly can also easily lead to thread wear, affecting the reliability of the connection.

[0003] Another method is to connect via a snap-fit ​​quick-change structure, which uses elastic snaps and slots to lock the connection by pressing or rotating. Some designs also incorporate an eccentric shaft for auxiliary positioning. However, snap-fit ​​quick-change structures are prone to fatigue and deformation after long-term use, leading to loosening of the connection. They also lack self-centering function, require high installation accuracy, and rely on a single contact surface for force transmission, which can easily cause stress concentration. Utility Model Content

[0004] The purpose of this invention is to provide a drive quick-change device to solve the problems in the prior art. It can achieve self-centering function, has low requirements for installation accuracy, and is easy to disassemble and assemble.

[0005] This utility model provides a drive quick-change device, comprising:

[0006] The fixed base has an internal cavity, and an annular sleeve is provided inside the cavity. A first guide groove is provided on the side of the annular sleeve facing its axis.

[0007] The quick-change assembly includes a first sleeve and a guide rod. The guide rod is inserted into the first sleeve and can move axially within the first sleeve. A plurality of balls are embedded in the end of the first sleeve at circumferential intervals. The end of the guide rod inserted into the first sleeve is provided with a second guide groove in the circumferential direction. During the movement of the guide rod, the balls can move relative to the second guide groove.

[0008] While driving the guide rod to move, the quick-change assembly is inserted into the fixed seat. When the ball abuts against the first guide groove, the quick-change assembly locks with the fixed seat. When the ball falls into the second guide groove, the quick-change assembly unlocks with the fixed seat.

[0009] In the drive quick-change device described above, preferably, the cross-sections of both the first guide groove and the second guide groove are V-shaped.

[0010] In the drive quick-change device described above, preferably, the first sleeve has a stop on one side along the axial direction and an opening on the other side, and the side of the guide rod facing the opening extends to the outside of the first sleeve.

[0011] In the drive quick-change device described above, preferably, an annular groove is formed on the inner wall of the first sleeve near the opening, a protrusion is provided on the side of the guide rod away from the second guide groove, and a first elastic element is movably sleeved on the guide rod. One end of the first elastic element abuts against the bottom of the annular groove along the axial direction, and the other end abuts against the protrusion.

[0012] In the drive quick-change device described above, preferably, the end of the first sleeve facing away from the fixed base is connected to the drive shaft via a force transmission block.

[0013] In the drive quick-change device described above, preferably, the end of the first sleeve facing away from the fixed seat has a groove communicating with the opening.

[0014] In the drive quick-change device described above, preferably, a second sleeve is provided inside the fixed base, one end of the second sleeve abuts against the annular sleeve, and the other end is connected to the fixed base.

[0015] In the drive quick-change device described above, preferably, a second elastic element is further provided in the receiving cavity, one end of the second elastic element abutting against the annular sleeve along the axial direction, and the other end abutting against the bottom wall of the receiving cavity.

[0016] In the drive quick-change device described above, preferably, the receiving cavity includes a first channel and a second channel that decrease in size in a stepped manner along the axial direction, the annular sleeve is disposed in the first channel, the annular sleeve can move axially within the first channel, and the second elastic element can reciprocate between the first channel and the second channel.

[0017] Compared with the prior art, this utility model achieves quick locking and unlocking with the fixed seat through the guide rod in the quick-change assembly. The guide rod cooperates with the first sleeve to achieve a self-centering function. The mechanical cooperation between the ball and the double annular groove enables quick assembly and disassembly, reducing the installation accuracy requirements. At the same time, the elastic element assists in reset, reducing component wear and extending service life. Attached Figure Description

[0018] Figure 1 This is a perspective view of the drive quick-change device provided in an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional view of the drive quick-change device provided in an embodiment of this utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0021] Figure 4 yes Figure 2 Another magnified view of point A in the middle;

[0022] Figure 5 This is a perspective view of the quick-change component provided in an embodiment of the present invention;

[0023] Figure 6 This is a cross-sectional view of the quick-change component provided in an embodiment of this utility model;

[0024] Figure 7 This is a perspective view of the fixing base provided in an embodiment of this utility model;

[0025] Figure 8 This is a cross-sectional view of the fixing base provided in an embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Fixed base; 11. Receiving cavity; 110. First channel; 111. Second channel; 12. Annular sleeve; 120. First guide groove; 13. Second sleeve; 14. Second elastic element; 15. Connecting part;

[0028] 20. Quick-change assembly; 21. First sleeve; 210. Stop; 211. Opening; 212. Annular groove; 213. Groove; 22. Guide rod; 220. Second guide groove; 221. Protrusion; 23. Ball bearing; 24. First elastic element;

[0029] 30. Drive shaft; 31. Force transmission block. Detailed Implementation

[0030] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] See Figure 1-4 As shown, this embodiment provides a drive quick-change device, including a fixed base 10 and a quick-change assembly 20. One end of the fixed base 10 is provided with a connecting part 15 for connecting a differential housing (not shown in the figure), and the other end is movably inserted into the quick-change assembly 20. The end of the quick-change assembly 20 away from the fixed base 10 is movably connected to a drive shaft 30. The quick-change assembly 20 can conveniently connect or separate the differential housing from the drive shaft 30, wherein:

[0032] The fixed base 10 has a cavity 11 inside, and an annular sleeve 12 is provided inside the cavity 11. A first guide groove 120 is provided on the side of the annular sleeve 12 facing its axis.

[0033] The quick-change assembly 20 includes a first sleeve 21 and a guide rod 22. The guide rod 22 is inserted into the first sleeve 21 and can move axially within the first sleeve 21. A plurality of balls 23 are embedded in the end of the first sleeve 21 at circumferential intervals. The end of the guide rod 22 inserted into the first sleeve 21 is provided with a second guide groove 220 in the circumferential direction. During the movement of the guide rod 22, the balls 23 can move relative to the second guide groove 220.

[0034] While the drive guide rod 22 moves, the quick-change assembly 20 is inserted into the fixed seat 10. When the ball 23 abuts against the first guide groove 120, the quick-change assembly 20 is locked to the fixed seat 10. When the ball 23 falls into the second guide groove 220, the quick-change assembly 20 is unlocked from the fixed seat 10.

[0035] In this embodiment, the dimensions of the first guide groove 120 and the second guide groove 220 are adapted to the ball 23. When the guide rod 22 is in the initial state, the outer wall of the guide rod 22 presses against the ball 23 and lifts it up to extend at least partially beyond the outer wall surface of the first sleeve 21. At this time, there is a certain gap between the end of the guide rod 22 and the end of the first sleeve 21. When the drive guide rod 22 moves axially toward the end of the first sleeve 21, the second guide groove 220 moves to the range where the ball 23 is located, and the ball 23 falls into the groove. The quick-change assembly 20 is located within the second guide groove 220. Therefore, during use, the guide rod 22 is first driven to move within the first sleeve 21, and the ball bearing 23 is housed within the second guide groove 220. The quick-change assembly 20 is then inserted into the receiving cavity 11. The guide rod 22 is then released or driven to move away from the receiving cavity 11. The groove wall of the second guide groove 220 pushes the ball bearing 23 towards the outer wall of the first sleeve 21 until it is completely lifted and engages within the first guide groove 120, thus connecting the quick-change assembly 20 to the fixed base 10. It should be noted that the diameter of the portion of the ball bearing 23 pushed out by the guide rod 22 is smaller than the diameter of the ball bearing 23 itself; that is, the diameter of the through hole on the first sleeve 21 for the movement of the ball bearing 23 is smaller than the diameter of the ball bearing 23. This is to prevent the ball bearing 23 from falling off the first sleeve 21.

[0036] See Figure 3-4 As shown, in this embodiment, both the first guide groove 120 and the second guide groove 220 have V-shaped cross sections. The V-shaped groove walls provide good guidance for the ball bearings 23. When the quick-change assembly 20 is unlocked from the fixed seat 10, the multiple circumferentially arranged ball bearings 23 can be fully accommodated in the second guide groove 220 under the interaction of the first guide groove 120 and the second guide groove 220.

[0037] In this embodiment, see Figure 6As shown, the first sleeve 21 has a stop 210 on one side along the axial direction and an opening 211 on the other side. The side of the guide rod 22 facing the opening 211 extends to the outside of the first sleeve 21. The stop 210 can limit the travel of the guide rod 22, preventing the guide rod 22 from moving excessively and causing the ball 23 to leave the normal working range from the guide groove. When the guide rod 22 moves to abut against the stop 210, the ball 23 just falls into the second guide groove 220. At this time, the quick-change assembly 20 is in a fully unlocked state. The guide rod 22 touching the stop 210 makes it easy for the operator to feel whether the ball 23 has completely fallen into the second guide groove 220 to confirm the unlocked state and avoid misoperation. The guide rod 22 extends out of the opening 211, which makes it easy for the operator to apply force to the guide rod 22.

[0038] See Figure 6 As shown, to facilitate the driving of the guide rod 22, an annular groove 212 is formed on the inner wall of the first sleeve 21 near the opening 211. A protrusion 221 is provided on the side of the guide rod 22 away from the second guide groove 220. A first elastic element 24 is movably sleeved on the guide rod 22. One end of the first elastic element 24 abuts against the bottom of the annular groove 212 along the axial direction, and the other end abuts against the protrusion 221. In this embodiment, the first elastic element 24 is a spring. When the guide rod 22 is driven close to the stop 210, the spring is compressed. When the guide rod 22 is released, the spring rebounds and drives the guide rod 22 to reset, realizing the self-resetting function.

[0039] See Figure 1 As shown, the end of the first sleeve 21 facing away from the fixed base 10 is connected to the drive shaft 30 via a force transmission block 31. The force transmission block 31 is an intermediate connecting component in a mechanical structure used to transmit torque, axial force, or radial force. For example, a keyway can be machined on the surface of the drive shaft 30. The force transmission block 31 adopts a trapezoidal cross-section groove design to improve torque transmission efficiency. Of course, other connection methods can also be used, and this application does not limit this.

[0040] See Figure 5 As shown, in this embodiment, the end of the first sleeve 21 facing away from the fixed base 10 has a groove 213 that communicates with the opening 211. The tool can penetrate into the opening 211 through the groove 213 to apply driving force to the guide rod 22, or it can be connected to the guide rod 22 through the groove 213 via other components to facilitate the movement of the guide rod 22. This is not limited here.

[0041] See Figure 7-8As shown, in one feasible approach, the annular sleeve 12 can be prevented from falling off by setting a stop block inside the fixed base 10, or a second sleeve 13 can be provided inside the fixed base 10, with one end of the second sleeve 13 abutting against the annular sleeve 12 and the other end connected to the fixed base 10. The second sleeve 13 can limit the movement of the annular sleeve 12 and guide the first sleeve 21. By reasonably setting the diameter of each component, a certain degree of sealing at the connection point can be ensured. The second sleeve 13 and the fixed base 10 can be connected by bolts, which will not be elaborated further here.

[0042] See Figure 2 and Figure 8 As shown, the annular sleeve 12 can move axially within the receiving cavity 11. Therefore, when the quick-change assembly 20 is inserted into the fixed seat 10 and locked with the annular sleeve 12, a second elastic element 14 is provided in the receiving cavity 11 to achieve quick locking and unlocking. One end of the second elastic element 14 abuts against the annular sleeve 12 along the axial direction, and the other end abuts against the bottom wall of the receiving cavity 11. In this embodiment, the second elastic element 14 is a spring. After the quick-change assembly 20 is connected to the annular sleeve 12, it can continue to move axially under the driving force. At this time, the spring is compressed. When the guide rod 22 is released, the first guide groove 120 of the annular sleeve 12 is precisely aligned with the ball 23, realizing automatic locking. The spring drives the annular sleeve 12 to reset. The operator can sense the insertion depth through the resistance of the spring compression, forming mechanical feedback.

[0043] See Figure 8 As shown, a certain adaptive floating space is required between the drive shaft 30 and the differential. Therefore, in this embodiment, the accommodating cavity 11 includes a first channel 110 and a second channel 111 with a stepped diameter decreasing along the axial direction. The diameter of the first channel 110 is larger than that of the second channel 111, forming a stepped surface. The annular sleeve 12 is disposed in the first channel 110. The annular sleeve 12 is restricted by the second channel 111 and can only move axially within the first channel 110. The second elastic element 14 can reciprocate between the first channel 110 and the second channel 111. When the annular sleeve 12 moves axially within the first channel 110, the spring can be compressed or extended between the stepped surface and the annular sleeve 12, allowing the drive shaft 30 to generate a certain range of axial floating.

[0044] This invention enables rapid connection and separation of the drive shaft 30 and the differential housing through the quick-change component 20 and the fixed base 10 clamping or unlocking. The guide rod 22 and the first sleeve 21 cooperate to achieve a self-centering accuracy of ±0.05mm. The modular force transmission design ensures uniform torque distribution and increases load-bearing capacity by 40%. The first elastic element 24 and the second elastic element 14 form a self-resetting structure, simplifying the operation process. The single disassembly and assembly time is ≤10 seconds. In addition, this structure is not only suitable for connecting the differential and the drive shaft, but also for connecting other drive structures in the field of engineering machinery. The single disassembly and assembly time is shortened to within 10 seconds, which has significant economic benefits.

[0045] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A drive quick-change device, characterized in that, include: The fixed base has an internal cavity, and an annular sleeve is provided inside the cavity. A first guide groove is provided on the side of the annular sleeve facing its axis. The quick-change assembly includes a first sleeve and a guide rod. The guide rod is inserted into the first sleeve and can move axially within the first sleeve. A plurality of balls are embedded in the end of the first sleeve at circumferential intervals. The end of the guide rod inserted into the first sleeve is provided with a second guide groove in the circumferential direction. During the movement of the guide rod, the balls can move relative to the second guide groove. While driving the guide rod to move, the quick-change assembly is inserted into the fixed seat. When the ball abuts against the first guide groove, the quick-change assembly locks with the fixed seat. When the ball falls into the second guide groove, the quick-change assembly unlocks with the fixed seat.

2. The drive quick-change device according to claim 1, characterized in that, Both the first guide groove and the second guide groove have V-shaped cross sections.

3. The drive quick-change device according to claim 1, characterized in that, The first sleeve has a stop on one side along the axial direction and an opening on the other side, and the side of the guide rod facing the opening extends to the outside of the first sleeve.

4. The drive quick-change device according to claim 3, characterized in that, An annular groove is formed on the inner wall of the first sleeve near the opening. A protrusion is provided on the side of the guide rod away from the second guide groove. A first elastic element is movably sleeved on the guide rod. One end of the first elastic element abuts against the bottom of the annular groove along the axial direction, and the other end abuts against the protrusion.

5. The drive quick-change device according to claim 1, characterized in that, The end of the first sleeve that is away from the fixed base is connected to the drive shaft via a force transmission block.

6. The drive quick-change device according to claim 3, characterized in that, The end of the first sleeve facing away from the fixed seat has a groove that communicates with the opening.

7. The drive quick-change device according to claim 1, characterized in that, The fixed base is provided with a second sleeve, one end of which abuts against the annular sleeve, and the other end is connected to the fixed base.

8. The drive quick-change device according to claim 1, characterized in that, The cavity is further provided with a second elastic element, one end of which abuts against the annular sleeve along the axial direction, and the other end of which abuts against the bottom wall of the cavity.

9. The drive quick-change device according to claim 1, characterized in that, The accommodating cavity includes a first channel and a second channel that decrease in a stepped manner along the axial direction. The annular sleeve is disposed in the first channel and can move axially within the first channel. The second elastic element can reciprocate between the first channel and the second channel.

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