A wedge key connection structure for convenient disassembly and assembly

Abstract

The present invention discloses a wedge-key connection structure that is easy to disassemble and assemble, and can be used to disassemble and install a wheel hub in a small space without the aid of special tools, and the keyway is easy to process and inspect. The wedge-key connection structure that is easy to disassemble and assemble includes a wedge key, a set screw, a shaft end retaining ring, a rotating shaft, a wheel hub, and a locking screw. The use of the wedge-key connection structure that is easy to disassemble and assemble can reduce the difficulty of processing, and processing and inspection can be completed without special equipment and fixtures; the structure has good machining processability; when the wheel hub is installed, the retaining ring locking screw is screwed into the shaft screw hole to make the end face of the wheel hub close to the shaft shoulder, which plays an axial limiting role; when the wheel hub is disassembled, the retaining ring locking screw can be screwed into the wedge key screw hole, and the wedge key can be easily pulled out.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a wedge-key connection structure which is convenient for assembly and disassembly. Background Art

[0002] As we all know, in the field of medical devices, in vitro diagnostic equipment obtains clinical diagnostic information by testing human samples (body fluids, tissues, etc.), and then judges diseases or body functions. In the process, the mechanical parts inside the testing equipment need to complete a series of complex actions such as sampling, separation, mixing, cleaning, and reading. The rotation of mechanical parts is generally completed by a rotating shaft. The shaft is equipped with a hub for input torque such as gears and pulleys. The shaft and the parts on the shaft are fixed by keys or set screws to achieve transmission of motion and torque. The side of the flat key is the working surface, and the force is transmitted by the side. When the transmission accuracy is high and there are strict transmission ratio requirements, the flat key on the rotating shaft and the keyway of the hub adopt an interference fit. When the equipment is maintained and parts are replaced, it is difficult to disassemble and assemble in the narrow equipment. The rotating shaft and the hub are connected by set screws. Although it can be easily disassembled and assembled, the reliability is not high. It is only suitable for low-speed, low-load, and non-impact occasions. The shaft and the hub are connected with a hook wedge key. When disassembling, a special disassembly tool is required, which is not convenient for operation inside the narrow equipment. In addition, when processing the hub, a keyway with a bevel must be processed in the inner hole, which makes processing and inspection difficult. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a wedge-key connection structure which is convenient for disassembly and assembly and can complete the disassembly and installation of the wheel hub in a narrow space without the aid of special tools, and the keyway is easy to process and inspect.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a wedge key connection structure that is convenient to disassemble and assemble, including a wedge key, a shaft end retaining ring, a rotating shaft, a wheel hub and a locking screw;

[0005] The bottom surface of the wheel hub is provided with a cylindrical boss; the wheel hub is provided with an inner hole passing through the cylindrical boss; the inner hole wall is provided with a keyway;

[0006] One end of the rotating shaft is provided with a connecting end matching the inner hole of the wheel hub; a wedge key groove is provided on the connecting end; the bottom surface of the wedge key groove is an inclined surface; the connecting end of the rotating shaft is provided with a first central threaded hole matching the locking screw;

[0007] The shaft end retaining ring is provided with a central through hole and a through hole; the wedge key has an upper working surface and a lower working surface; the upper working surface is a mounting inclined surface matching the inclined surface; one end of the wedge key is a small end surface, and the other end is a large end surface; the large end surface of the wedge key is provided with a second central threaded hole matching the locking screw;

[0008] The connecting end is inserted into the inner hole of the wheel hub, and the wedge key groove matches the key slot to form a mounting slot matching the wedge key; the wedge key is installed in the mounting slot;

[0009] The shaft end retaining ring is installed on the end surface of the cylindrical boss; one end of the locking screw passes through the central through hole and is threadedly matched with the first central threaded hole.

[0010] Furthermore, the wedge key connection structure that can be easily disassembled and assembled also includes a set screw, and a transverse screw hole is provided on the cylindrical boss; one end of the set screw passes through the transverse screw hole to tighten the wedge key.

[0011] Furthermore, the slope of the upper working surface is greater than 1:100.

[0012] Specifically, a shaft shoulder is provided at one end of the connecting end on the rotating shaft.

[0013] The beneficial effects of the present invention are as follows: the conveniently disassembled wedge key connection structure of the present invention has the following beneficial effects compared with the prior art:

[0014] 1. The wheel hub can be disassembled and installed in a small space without the help of special tools, which is convenient for maintenance.

[0015] 2. Different from the prior art, the bottom surface of the hub keyway is parallel to the axis of the hub inner hole and has no slope, and the inner hole has no slope, which greatly reduces the difficulty of processing and can complete processing and inspection without special equipment and fixtures.

[0016] 3. The difference from the prior art is that the bottom of the shaft keyway is an inclined surface that forms an angle with the axis. It is much easier to process the inclined surface on the outer circle of the shaft than in the hole. It can be processed by general machining equipment, and the size, shape and position tolerances are easy to check and control, and the structure has good machining processability.

[0017] 4. What is different from the prior art is that a screw hole is provided on the end face in the length direction of the wedge key, and the slope of the inclined surface is greater than 1:100, which is conducive to the disassembly of the wedge key.

[0018] 5. When installing the wheel hub, the retaining ring locking screw is screwed into the shaft screw hole to make the end face of the wheel hub close to the shaft shoulder, which plays an axial limiting role; when disassembling the wheel hub, the retaining ring locking screw can be screwed into the wedge key screw hole, and the wedge key can be easily pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a wedge key connection structure for convenient assembly and disassembly in an embodiment of the present invention;

[0020] Figure 2 is a partial cross-sectional view of a wheel hub after installation in an embodiment of the present invention;

[0021] Figure 3is a partial cross-sectional view of the wedge key being pulled out when the wheel hub is disassembled in the embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the wedge key structure in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the rotating shaft structure in an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of the hub structure in an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the structure of the shaft end retaining ring in an embodiment of the present invention;

[0026] Markings in the figure: 1- wedge key, 2- set screw, 3- shaft end retaining ring, 4- rotating shaft, 5- wheel hub, 6- locking screw, 7- inclined surface. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figures 1 to 4 As shown, a wedge key connection structure for convenient assembly and disassembly according to the present invention comprises a wedge key 1, a shaft end retaining ring 3, a rotating shaft 4, a wheel hub 5 and a locking screw 6;

[0029] The bottom surface of the wheel hub 5 is provided with a cylindrical boss 56; the wheel hub 5 is provided with an inner hole 53 passing through the cylindrical boss 56; the inner wall of the inner hole 53 is provided with a keyway 52;

[0030] One end of the rotating shaft 4 is provided with a connecting end 42 matching the inner hole 53; a wedge key groove 41 is provided on the connecting end 42; the bottom surface of the wedge key groove 41 is an inclined surface 7; the connecting end 42 of the rotating shaft 4 is provided with a first central threaded hole 43 matching the locking screw 6;

[0031] The shaft end retaining ring 3 is provided with a central through hole 31 and a through hole 32; the wedge key 1 has an upper working surface 11 and a lower working surface 12; the upper working surface 11 is a mounting inclined surface matching the inclined surface 7; one end of the wedge key 1 is a small end surface, and the other end is a large end surface 13; the large end surface 13 of the wedge key 1 is provided with a second central threaded hole 14 matching the locking screw 6;

[0032] The connecting end 42 is inserted into the inner hole 53, and the wedge key groove 41 matches with the key groove 52 to form a mounting groove matching the wedge key 1; the wedge key 1 is installed in the mounting groove;

[0033] The shaft end retaining ring 3 is installed on the end surface of the cylindrical boss 56 ; one end of the locking screw 6 passes through the central through hole 31 and is threadedly matched with the first central threaded hole 43 .

[0034] In the application process, specifically, the conveniently disassembled wedge key connection structure further includes a set screw 2, and a transverse screw hole 54 is provided on the cylindrical boss 56; one end of the set screw 2 passes through the transverse screw hole 54 to press the wedge key 1. One end of the connecting end 42 on the rotating shaft 4 is provided with a shaft shoulder 44.

[0035] Hub installation process: Sleeve the inner hole 53 of the hub 5 onto the outer circle of the connecting end 42 of the shaft 4, and the end face 55 of the hub 5 is close to the shoulder 44 at the transition between the connecting end 42 and the shaft 4. Place the wedge key 1 into the installation groove formed by the wedge key groove 41 and the keyway 52, so that the upper working surface 11 of the wedge key 1 fits with the inclined surface 7 of the wedge key groove 41, and the lower working surface 12 fits with the bottom surface of the keyway 52 of the hub 5, and tap the large end face 13 of the wedge key 1 to drive it in and wedge it. The locking screw 6 passes through the central through hole 31 of the shaft end retaining ring and is screwed into the first central threaded hole 43 of the end face of the shaft 4. The shaft end retaining ring 3 is pressed tightly on the end face of the cylindrical boss 56, and the set screw 2 is screwed into the screw hole 54 of the hub, and the cone end is against the lower working surface 12 of the wedge key. The hub installation is completed.

[0036] Wheel hub removal process:

[0037] First, remove the set screw 2 in the transverse screw hole 54, and then screw out the locking screw 6 of the shaft end retaining ring 3; then, pass the locking screw 6 through the through hole 32 of the shaft end retaining ring 3 and screw it into the second central threaded hole 14 on the end face of the wedge key 1. Only a small torque is required to pull out the wedge key 1. The hub 5 can then be taken out along the axial direction.

[0038] In summary, the wedge key connection structure that is easy to disassemble and assemble includes a wheel hub 5, a shaft end retaining ring 3, a retaining ring locking screw 6, a wedge key 1, a set screw 2, and a rotating shaft 4. During installation, the inner hole of the wheel hub is sleeved on the shaft, and the end face of the wheel hub is close to the shaft shoulder. Place the wedge key into the keyway, so that the upper working surface of the wedge key fits with the inclined surface of the shaft keyway, and the lower working surface fits with the bottom surface of the keyway of the wheel hub, and the large end face of the wedge key is hit to drive it in and wedge it. The locking screw passes through the through hole in the center of the shaft end retaining ring and is screwed into the first center threaded hole on the end face of the rotating shaft. The shaft end retaining ring is pressed tightly against the end face of the wheel hub, and the set screw is screwed into the transverse screw hole of the wheel hub, with the tapered end supporting the lower working surface of the wedge key. The installation of the wheel hub is completed. When disassembling, first remove the set screw in the screw hole of the wheel hub, then screw out the locking screw of the retaining ring, and then pass the screw through the through hole of the retaining ring at the shaft end and screw it into the second center threaded hole on the end face of the wedge key. Only a small torque needs to be applied to pull out the wedge key, and the wheel hub can then be taken out along the axial direction.

[0039] In order to facilitate the removal of the wedge key, further, the slope of the upper working surface 11 is greater than 1:100.

Claims

1. A wedge key connection structure that is easy to disassemble and assemble, characterized in that: It comprises a wedge key (1), a shaft end retaining ring (3), a rotating shaft (4), a wheel hub (5) and a locking screw (6); The bottom surface of the wheel hub (5) is provided with a cylindrical boss (56); the wheel hub (5) is provided with an inner hole (53) passing through the cylindrical boss (56); and the inner wall of the inner hole (53) is provided with a keyway (52); One end of the rotating shaft (4) is provided with a connecting end (42) matching the inner hole (53); a wedge key groove (41) is provided on the connecting end (42); the bottom surface of the wedge key groove (41) is an inclined surface (7); the connecting end (42) of the rotating shaft (4) is provided with a first central threaded hole (43) matching the locking screw (6); The shaft end retaining ring (3) is provided with a central through hole (31) and a through hole (32); the wedge key (1) has an upper working surface (11) and a lower working surface (12); the upper working surface (11) is a mounting bevel that matches the bevel (7); one end of the wedge key (1) is a small end surface, and the other end is a large end surface (13); the large end surface (13) of the wedge key (1) is provided with a second central threaded hole (14) that matches the locking screw (6); The connecting end (42) is inserted into the inner hole (53), and the wedge key groove (41) matches with the key groove (52) to form a mounting groove matching the wedge key (1); the wedge key (1) is installed in the mounting groove; The shaft end retaining ring (3) is mounted on the end surface of the cylindrical boss (56); one end of the locking screw (6) passes through the central through hole (31) and is threadedly engaged with the first central threaded hole (43); It also includes a set screw (2), and the cylindrical boss (56) is provided with a transverse screw hole (54); one end of the set screw (2) passes through the transverse screw hole (54) to press the wedge key (1); One end of the connecting end (42) on the rotating shaft (4) is provided with a shaft shoulder (44).

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