Locking device

Abstract

This invention provides a locking device in which an expansion sleeve, fitted onto a rotating shaft and radially variable in diameter and locked to the shaft, is placed inside a fixed collar. The expansion sleeve and the fixed collar form a circumferential limiting fit, and an adjustment mechanism for driving the expansion sleeve to contract radially is provided between them. The fixed collar is circumferentially limited to the inner end of a radially arranged rod, and the outer end of the rod forms a circumferential limiting fit with the machine base. This ensures that the rotating shaft and the machine base are relatively stationary circumferentially, facilitating the rotation of the machine base with the rotating shaft as the positioning and clamping center, and enabling the use of cutting tools to machine a part of the machine base or accessories on the machine base, such as irregularly shaped end caps.

Description

Technical Field

[0001] This invention belongs to the field of motor manufacturing technology, and specifically relates to a locking device. Background Technology

[0002] Currently, in some complete motor machining processes, when the frame is being machined, the motor shaft is often used as a clamping point to fix the frame. However, since the motor shaft and the frame can rotate relative to each other, if only the motor shaft is clamped during machining, the frame will be in a rotatable state and cannot be fixed. Therefore, to facilitate the machining of the frame, it is necessary to ensure that the motor shaft and the frame cannot rotate relative to each other during machining. This allows for the machining of the frame during complete machine machining. Furthermore, since the shaft in complete machine machining has already undergone a finishing process, it is also necessary to keep the shaft and the frame relatively stationary while avoiding leaving scratches on the shaft, which would affect the next step of motor manufacturing. Summary of the Invention

[0003] The present invention provides a locking device that can keep the rotating shaft relatively stationary with respect to the base while ensuring the integrity of the rotating shaft.

[0004] To achieve the above objectives, the present invention adopts the following technical solution;

[0005] A locking device comprises an expansion sleeve fitted on a rotating shaft and radially variable in diameter and locked onto the rotating shaft, which is placed inside a fixed ring. The expansion sleeve and the fixed ring form a circumferential limiting fit, and an adjustment mechanism for driving the expansion sleeve to contract radially is provided between them. The fixed ring is circumferentially limited to the inner end of a radially arranged rod, and the outer end of the rod forms a circumferential limiting fit with the machine base.

[0006] In the above scheme, the fixed collar is circumferentially limited and connected to the inner end of the radially arranged rod. The expansion sleeve is placed on the rotating shaft and inside the fixed collar. By setting an adjustment mechanism between the expansion sleeve and the fixed collar to drive the expansion sleeve to contract radially, the expansion sleeve and the rotating shaft are radially locked. At this time, the adjustment mechanism does not directly contact the rotating shaft, so it will not damage the rotating shaft. Moreover, the expansion sleeve and the rotating shaft, the expansion sleeve and the fixed collar, and the fixed collar and the rod are all relatively stationary. As long as the outer end of the rod and the machine base form a circumferential limiting fit, the rotating shaft and the machine base can be guaranteed to be circumferentially stationary, which means that the rotating shaft and the machine base can be guaranteed to rotate synchronously. This facilitates the rotation of the machine base with the rotating shaft as the positioning and clamping center, and the use of cutting tools to process a certain part of the machine base or accessories on the machine base such as irregular end caps. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the assembly state of the present invention;

[0008] Figure 2 yes Figure 1 Enlarged detail image;

[0009] Figure 3 yes Figure 1 A further enlarged view;

[0010] Figure 4 This is a cross-sectional view of the expansion sleeve in this invention;

[0011] Figure 5 This is a cross-sectional view of the pressure sleeve in this invention. Detailed Implementation

[0012] like Figure 1 The locking device shown has an expansion sleeve 40 fitted on a rotating shaft 1 and radially variable in diameter and locked on the rotating shaft 1, which is placed inside a fixed collar 20. The expansion sleeve 40 and the fixed collar 20 form a circumferential limiting fit, and an adjustment mechanism for driving the expansion sleeve 40 to retract radially is provided between them. The fixed collar 20 is circumferentially limited to the inner end of a radially arranged rod 30, and the outer end of the rod 30 forms a circumferential limiting fit with the base 2.

[0013] The rotating shaft 1 in the above scheme has been precision machined. Therefore, to prevent scratches from forming on the shaft body of the rotating shaft 1 during fixing, which would affect the next step of installation, the fixing ring 20, which is circumferentially limited by the inner end of the radially arranged rod 30, is first placed on the rotating shaft 1. Then, the expansion sleeve 40 is placed inside the fixing ring 20 and wrapped around the rotating shaft. The expansion sleeve 40 is driven to retract radially by the adjustment mechanism between the expansion sleeve 40 and the fixing ring 20. This circumferentially limits the expansion sleeve 40 and the rotating shaft 1. Since the expansion sleeve 40 is wrapped around the rotating shaft 1, direct contact between the adjustment mechanism and the rotating shaft is avoided, preventing damage to the rotating shaft. Because the expansion sleeve 40 and the fixing ring 20 form a circumferential limiting fit, and the outer end of the rod 30 and the machine base 2 form a circumferential limiting fit, the rotating shaft 1 and the machine base 2 are circumferentially limited and cannot rotate relative to each other. When turning or boring specific parts on the machine base, the rotating shaft 1 and the machine base 2 will rotate synchronously or be stationary at the same time.

[0014] The preferred expansion sleeve 40 has a pipe slit 41 on its pipe wall to form an open sleeve with a cross section of C. The outer circumference of the expansion sleeve 40 is a cone shape with a large outer diameter at one end and a small outer diameter at the other end. The pressure sleeve 50 in the adjustment mechanism is fitted on the expansion sleeve 40. The cavity of the pressure sleeve 50 is a conical cavity that matches the outer wall of the expansion sleeve 40. When the pressure sleeve 50 is displaced toward the machine base 2, a radial force is applied to constrain the diameter of the expansion sleeve 40 to become smaller.

[0015] The expansion sleeve 40 in the above scheme is provided with a pipe slit 41, which can shrink the pipe diameter circumferentially when the pressure sleeve 50 moves towards the machine base 2, thereby ensuring that the expansion sleeve 40 is fixed on the rotating shaft 1. The outer circumferential surface of the expansion sleeve 40 is preferably a cone shape with a large outer diameter at the inner end and a small outer diameter at the outer end, which can assist the pressure sleeve 50 to move from the outer end towards the machine base 2.

[0016] Preferably, in order to facilitate uniform contraction of the expansion sleeve 40 in the radial direction at all circumferential locations, a groove 42 is provided on the inner wall of the expansion sleeve 40 beside the pipe seam 41, and the length direction of the pipe seam 41 and the groove 42 is consistent with the core direction of the expansion sleeve 40.

[0017] In order to facilitate the radial contraction of the expansion sleeve 40 in the circumferential direction, so that the expansion sleeve 40 can be better positioned in the circumferential direction with the rotating shaft 1, preferably, three grooves 42 are provided and evenly distributed in the circumferential direction with the pipe seam 41.

[0018] Preferably, the groove 42 on the opposite side of the pipe seam 41 of the expansion sleeve 40 is a flat keyway 421. By setting the flat keyway 421 on the opposite side of the pipe seam 41 on the expansion sleeve 40, the flat keyway 421 can cooperate with the key block on the rotating shaft 1, further ensuring that the expansion sleeve 40 and the rotating shaft 1 cannot rotate relative to each other.

[0019] A screw sleeve 60 is fitted onto the pressure sleeve 50, and the screw sleeve 60 and the pressure sleeve 50 form an axial limiting fit that allows synchronous displacement towards the side where the machine base 2 is located.

[0020] The adjustment mechanism in the above scheme includes a pressure sleeve 50 and a screw sleeve 60. The screw sleeve 60 pushes the pressure sleeve 50 into the space formed by the expansion sleeve 40 and the fixed ring 20. Because the expansion sleeve 40 is conical with a large outer diameter at the inner end and a small outer diameter at the outer end, when the screw sleeve 60 pushes the pressure sleeve 50 into the space formed by the expansion sleeve 40 and the fixed ring 20, the pressure sleeve 50 will further squeeze the expansion sleeve 40, thereby ensuring circumferential limiting between the expansion sleeve 40 and the pressure sleeve 50, and between the expansion sleeve 40 and the rotating shaft 1.

[0021] The outer end of the screw sleeve 60 has a built-in convex ring 61 that is placed on the outer end of the pressure sleeve 50. When the screw sleeve 60 moves synchronously to the side where the machine base 2 is located, the convex ring 61 pushes the pressure sleeve 50 from the outer end of the pressure sleeve 50, ensuring that the pressure sleeve 50 and the screw sleeve 60 move synchronously.

[0022] The screw section 62 on the outer circumferential surface of the screw sleeve 60 forms a threaded fit with the screw hole section of the fixing ring 20. The screw section 62 is located in the inner section of the screw sleeve 60, and the outer section of the screw sleeve 60 outside the screw section 62 is a hexagonal section 63.

[0023] In the above scheme, the screw section 62 on the outer circumferential surface of the screw sleeve 60 forms a threaded engagement with the screw hole section of the fixed collar 20. While ensuring that the screw sleeve 60 can rotate and move forward in the fixed collar 20, the threaded engagement makes the screw sleeve 60 and the fixed collar 20 relatively fixed. As the screw sleeve 60 moves forward, the screw sleeve 60, along with the pressure sleeve 50, further compresses the expansion sleeve 40. Preferably, in order to facilitate the rotation of the screw section 62, the outer section of the screw sleeve 60 outside the screw section 62 is a hexagonal section 63, which is convenient for using tools such as wrenches.

[0024] Preferably, in order to further ensure the stability of the fixed collar 20 in the axial direction, the inner end face of the expansion sleeve 40 abuts against the annular disk 21 at the inner end of the fixed collar 20. The annular disk 21 constitutes a block for the axial inward displacement of the expansion sleeve 40. The axial position of the expansion sleeve 40 is determined. When the pressure sleeve 50 moves axially inward on the expansion sleeve 40, it will apply a radial force to constrain the expansion sleeve 40 to radially contract and tighten it on the rotating shaft 1.

[0025] like Figure 1 As shown, a rod 30 is connected to the outer wall of the fixing collar 20. The rod 30 includes a vertical rod 31 and a horizontal rod 32. The inner end of the vertical rod 31 is fixedly connected to the outer wall of the fixing collar 20, and the outer end of the vertical rod 31 is connected to the outer end of the horizontal rod 32. The inner end of the horizontal rod 32 forms a circumferential limiting fit with the machine base 2. In the above scheme, the rod 30 is composed of a vertical rod 31 and a horizontal rod 32. The inner end of the horizontal rod 32 forms a circumferential limiting fit with the machine base 2, and the outer end of the vertical rod 31 is connected to the outer end of the horizontal rod 32, thereby ensuring the circumferential limiting of the fixing collar 20 and the machine base 2.

[0026] Preferably, in order to facilitate the circumferential limiting fit between the rod 30 and the base 2, the rod 30 is arranged in 2 to 4 circumferential positions. In use, there is no need to find a specific position that satisfies the circumferential limiting fit. It is sufficient that the rod 30 and the base 2 can form a circumferential limiting fit together in multiple positions.

[0027] The outer wall of the preferred pressure sleeve 50 has a groove 51. During disassembly, since the pressure sleeve 50 has been fully tightened by the expansion sleeve 40, the pressure sleeve 50 will not retract synchronously with the screw sleeve 60. Therefore, to facilitate the removal of the pressure sleeve 50, a groove 51 is provided on the pressure sleeve 50, and the groove 51 is located in the exposed position. Figure 2 , 5 It can be seen that the groove 51 is located outside the right end of the fixing ring 20. By inserting a tool such as a chisel or screwdriver into the groove 51 and forcefully bending it, the pressure sleeve 50 can be removed.

Claims

1. A locking device, characterized in that: An expansion sleeve (40) fitted on a rotating shaft (1) and radially variable and locked on the rotating shaft (1) is placed inside a fixed collar (20). The expansion sleeve (40) and the fixed collar (20) form a circumferential limiting fit, and an adjustment mechanism for driving the expansion sleeve (40) to radially contract is provided between them. The fixed collar (20) is circumferentially limited connected to the inner end of a radially arranged rod (30). The outer end of the rod (30) forms a circumferential limiting fit with the machine base (2). The machine base (2) is rotated with the rotating shaft (1) as the positioning and clamping center to process the machine base (2) or the accessories on the machine base (2).

2. The locking device according to claim 1, characterized in that: The expansion sleeve (40) has a pipe slit (41) on its pipe wall to form an open sleeve with a cross section of C. The outer circumference of the expansion sleeve (40) is a cone with a large outer diameter at one end and a small outer diameter at the other end. The pressure sleeve (50) in the adjustment mechanism is placed on the expansion sleeve (40). The cavity of the pressure sleeve (50) is a cone-shaped cavity that matches the outer wall of the expansion sleeve (40). When the pressure sleeve (50) moves toward the machine base (2), a radial force is applied to constrain the diameter of the expansion sleeve (40) to become smaller.

3. The locking device according to claim 2, characterized in that: A groove (42) is provided on the inner wall of the expansion sleeve (40) next to the pipe seam (41), and the length direction of the pipe seam (41) and the groove (42) is consistent with the core direction of the expansion sleeve (40).

4. The locking device according to claim 3, characterized in that: Three grooves (42) are provided and are evenly distributed in the circumferential direction with the pipe seam (41).

5. The locking device according to claim 3 or 4, characterized in that: The groove (42) on the opposite side of the pipe seam (41) of the expansion sleeve (40) is a flat keyway (421).

6. The locking device according to claim 2, 3, or 4, characterized in that: A screw sleeve (60) is fitted on the pressure sleeve (50), and the screw sleeve (60) and the pressure sleeve (50) form an axial limiting fit that allows synchronous displacement towards the side where the machine base (2) is located.

7. The locking device according to claim 6, characterized in that: The outer end of the screw sleeve (60) has a built-in convex ring (61) that is placed on the outer end of the pressure sleeve (50).

8. The locking device according to claim 6, characterized in that: The screw section (62) on the outer circumference of the screw sleeve (60) forms a threaded fit with the screw hole section of the fixing ring (20). The screw section (62) is located in the inner section of the screw sleeve (60), and the outer section of the screw sleeve (60) outside the screw section (62) is a hexagonal section (63).

9. The locking device according to claim 5, characterized in that: The inner end face of the expansion sleeve (40) abuts against the annular disc (21) at the inner end of the fixing ring (20).

10. The locking device according to claim 8, characterized in that: A rod (30) is connected to the outer ring wall of the fixed collar (20). The rod (30) includes a vertical rod (31) and a horizontal rod (32). The inner end of the vertical rod (31) is fixedly connected to the outer ring wall of the fixed collar (20). The outer end of the vertical rod (31) is connected to the outer end of the horizontal rod (32). The inner end of the horizontal rod (32) forms a circumferential limiting fit with the machine base (2).

11. The locking device according to claim 10, characterized in that: The aforementioned rods (30) are arranged in circumferentially in 2 to 4 parts.

12. The locking device according to claim 2, characterized in that: The outer wall of the outer end section of the pressure sleeve (50) has a groove (51).

Images