Motor with overload protection

Abstract

The utility model discloses a motor with overload protection, which relates to the technical field of stepping motors and comprises a micro motor casing, the end portion of the micro motor casing is fixedly connected with a mounting end cover, and a motor driving shaft penetrates through the mounting end cover. The bottom of the motor driving shaft is riveted and matched with a friction protection gasket and a transmission gear; the motor driving shaft comprises an outer shaft rod movably connected with the mounting end cover, a gear mounting shaft for fixing a friction protection gasket and a transmission gear is integrally arranged at the bottom of the outer shaft rod, and a positioning shaft head is further integrally arranged at the end of the gear mounting shaft. According to the utility model, the transmission gear drives the motor driving shaft to rotate by virtue of the friction force between the two conical gaskets and the transmission gear, and when the torque of the end part of the motor driving shaft exceeds the friction force between the transmission gear and the conical gaskets, a slipping phenomenon occurs, so that the overload protection capability is realized for the interior of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stepping motor, and particularly relates to a motor with overload protection. BACKGROUND

[0002] The stepping motor is an open-loop control motor for converting an electric pulse signal into angular displacement or linear displacement, rotates an angle or moves forward one step for each input electric pulse, and the displacement is strictly proportional to the number of input pulses, and the rotation speed is proportional to the pulse frequency, wherein the micro stepping motor has the advantages of small size, high precision and simple control, is a key execution component in a micro electro mechanical system, and is widely applied to household appliances, office supplies and the like.

[0003] The micro stepping motor mainly comprises a base, a mover and a linear guide rail, the base simultaneously acts as a stator, has magnetic poles, stator teeth, coils and a control circuit on the surface, the mover is located above the stator and has mover teeth on the lower surface, the guide rail functions as a linear bearing to keep the mover in a proper position, the guide rail and the upper surface of the mover have a shell for sealing, and the mover is separated from surrounding elements through an air gap.

[0004] The micro stepping motor is generally installed in small devices, the driving load required by the execution mechanism in the devices during movement is larger than that of the micro stepping motor, therefore, the micro stepping motor often needs to bear several times of output load, and a speed reduction mechanism is generally installed at the end of the stepping motor to increase the output load of the motor.

[0005] However, in practice, it has been found that in the application of some devices, the load of the stepping motor changes according to the current application scene, which easily causes the micro stepping motor to be overloaded, thereby causing the micro stepping motor to lose step, and this step loss phenomenon causes serious problems in the application requiring accurate position control, thereby failing to guarantee the rotation precision of the stepping motor. UTILITY MODEL CONTENTS

[0006] The utility model discloses a motor with overload protection, utilize two taper setting's taper gasket, make transmission gear through friction and outer axle rod fixed connection, when load exceeds the friction between taper gasket and transmission gear, transmission gear will slide between two taper gaskets, thereby play the role of overload protection. To solve the technical problem raised in the above background art.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A motor with overload protection, comprising a micro motor shell, an installation end cover is fixedly connected to the end of the micro motor shell, a motor drive shaft penetrates through the installation end cover, a friction protection gasket and a transmission gear are riveted to the bottom of the motor drive shaft,

[0009] The motor driving shaft comprises an outer shaft rod movably connected with the mounting end cover, a gear mounting shaft for fixing a friction protection pad and a transmission gear is integrally arranged at the bottom of the outer shaft rod, and a positioning shaft head is integrally arranged at the end of the gear mounting shaft.

[0010] As a further technical scheme of the utility model, the transmission gear is sleeved on the gear mounting shaft, both ends of the transmission gear are provided with friction protection pads, the two friction protection pads are symmetrically arranged, and a riveting head for fixing the friction protection pads is integrally arranged at the other end of the gear mounting shaft.

[0011] As a further technical scheme of the utility model, the friction protection pad comprises a tapered pad arranged in a tapered shape, a through hole is formed in the tapered pad, the end of the gear mounting shaft penetrates through the through hole, and the end of the tapered pad is integrally provided with symmetric positioning clamping plates.

[0012] As a further technical scheme of the utility model, the end of the tapered pad away from the positioning clamping plate is attached to the transmission gear, a positioning clamping groove corresponding to the positioning clamping plate is formed at the end of the outer shaft rod close to the gear mounting shaft, and the positioning clamping plate is clamped in the positioning clamping groove.

[0013] As a further technical scheme of the utility model, the rotor driving gear is arranged in the micro motor shell, the upper portion of the rotor driving gear is provided with a retainer inserted and matched with the micro motor shell, and the end of the rotor driving gear penetrates through the retainer and extends to the upper portion of the retainer.

[0014] As a further technical scheme of the utility model, the motor driving shaft is located above the retainer, the positioning shaft head in the motor driving shaft is inserted and matched with the retainer, and the transmission gear arranged at the bottom of the motor driving shaft is meshed with the end of the rotor driving gear extending to the upper portion of the retainer.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses the two ends of transmission gear are symmetrically provided with tapered pads, rely on the friction between two tapered pads and transmission gear, make transmission gear drive motor driving shaft rotation, when the torque of motor driving shaft end portion exceeds motor maximum torque, the friction between transmission gear and tapered pad cannot bear the torque on motor driving shaft, and the phenomenon of slippage will appear, thereby the ability of overload protection to the motor inside is played;

[0017] The utility model discloses, the side of each conical gasket is symmetrically equipped with the locating clamping plate, and the motor drive shaft is equipped with the locating clamping groove corresponding with the locating clamping plate still, through the intercoordination of locating clamping plate and locating clamping groove, the relative position between fixed conical gasket and outer axle rod is fixed, prevent the friction between outer axle rod and conical gasket too small and lead to appear the shift, influence the output load of motor;

[0018] The utility model discloses, the bottom integral type of outer axle rod is equipped with the gear mounting shaft of installing friction protection gasket and transmission gear, and one end of gear mounting shaft is riveted with friction protection gasket through riveting head riveting cooperation, through the clamping force between two conical gaskets, the maximum output load that motor can bear is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the use state structure schematic drawing of the utility model.

[0020] Figure 2 It is the internal structure schematic drawing of the utility model Figure 1 .

[0021] Figure 3 It is the position structure schematic drawing of motor drive shaft, friction protection gasket and transmission gear in the utility model.

[0022] Figure 4 It is the bottom structure schematic drawing of the utility model Figure 3 .

[0023] Figure 5 It is the three-dimensional structure schematic drawing of motor drive shaft in the utility model.

[0024] Figure 6 It is the bottom structure schematic drawing of the utility model Figure 5 .

[0025] Figure 7 It is the three-dimensional structure schematic drawing of friction protection gasket in the utility model.

[0026] Figure 8 It is the bottom structure schematic drawing of the utility model Figure 7 .

[0027] In the drawing:

[0028] Miniature motor shell-1, mounting end cover-2, wire waterproof shell-3, motor drive shaft-4, outer axle rod-41, riveting head-42, locating shaft head-43, gear mounting shaft-44, locating clamping groove-45, retainer-5, rotor drive gear-6, friction protection gasket-7, conical gasket-71, through -hole-72, locating clamping plate-73, transmission gear-8. DETAILED DESCRIPTION

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0030] Please refer to Figures 1-8 The embodiment of the present application provides a motor with overload protection, which comprises a micro motor shell 1, the end of the micro motor shell 1 is fixedly connected with a mounting end cover 2, a motor driving shaft 4 penetrates through the mounting end cover 2, and a friction protection gasket 7 and a transmission gear 8 are riveted to the bottom of the motor driving shaft 4.

[0031] The motor driving shaft 4 comprises an outer shaft rod 41 movably connected with the mounting end cover 2, the bottom of the outer shaft rod 41 is integrally provided with a gear mounting shaft 44 for fixing the friction protection gasket 7 and the transmission gear 8, and the end of the gear mounting shaft 44 is further integrally provided with a positioning shaft head 43.

[0032] In the embodiment, the transmission gear 8 is sleeved on the gear mounting shaft 44, the two ends of the transmission gear 8 are provided with the friction protection gasket 7, the two friction protection gaskets 7 are symmetrically arranged, and the other end of the gear mounting shaft 44 is further integrally provided with a riveting head 42 for fixing the friction protection gasket 7.

[0033] Further, the friction protection gasket 7 comprises a tapered gasket 71 arranged in a tapered shape, a through hole 72 is formed in the tapered gasket 71, the end of the gear mounting shaft 44 penetrates through the through hole 72, and the end of the tapered gasket 71 is integrally provided with a symmetric positioning clamping plate 73.

[0034] By adopting the above technical solution, the two ends of the transmission gear 8 are symmetrically provided with the tapered gasket 71, the friction force between the two tapered gaskets 71 and the transmission gear 8 drives the transmission gear 8 to rotate, when the torque at the end of the motor driving shaft 4 exceeds the maximum torque of the motor, the friction force between the transmission gear 8 and the tapered gasket 71 cannot bear the torque on the motor driving shaft 4, and the phenomenon of slipping occurs, thereby the overload protection capability of the motor is achieved.

[0035] Specifically, the end of the tapered gasket 71 away from the positioning clamping plate 73 is attached to the transmission gear 8, the end of the outer shaft rod 41 close to the gear mounting shaft 44 is provided with a positioning clamping groove 45 corresponding to the positioning clamping plate 73, and the positioning clamping plate 73 is clamped in the positioning clamping groove 45.

[0036] Further, the micro motor shell 1 is provided with a rotor driving gear 6, the upper portion of the rotor driving gear 6 is provided with a retainer 5 which is inserted into the micro motor shell 1, and the end of the rotor driving gear 6 extends to the upper portion of the retainer 5 through the retainer 5.

[0037] Specifically, the motor driving shaft 4 is located above the retainer 5, the positioning shaft head 43 in the motor driving shaft 4 is inserted into the retainer 5, and the transmission gear 8 installed at the bottom of the motor driving shaft 4 is engaged with the end of the rotor driving gear 6 which extends to the upper portion of the retainer 5.

[0038] By adopting the above technical scheme, the side surface of each conical gasket 71 is symmetrically provided with a positioning clamping plate 73, and the motor driving shaft 4 is further provided with a positioning clamping groove 45 corresponding to the positioning clamping plate 73, the relative position between the conical gasket 71 and the outer shaft 41 is fixed through the mutual cooperation of the positioning clamping plate 73 and the positioning clamping groove 45, and the friction between the outer shaft 41 and the conical gasket 71 is prevented from being too small to cause the outer shaft 41 to move, thereby affecting the output load of the motor.

[0039] Further, the side surface of the micro motor shell 1 is further provided with a wire waterproof shell 3, and the installation end cover 2 covers the upper portion of the wire waterproof shell 3, wherein the top portion of the wire waterproof shell 3 is integrally provided with a positioning protrusion, and the installation end cover 2 is provided with a groove corresponding to the positioning protrusion, the position between the installation end cover 2 and the wire waterproof shell 3 is positioned through the clamping cooperation between the positioning protrusion and the groove, and the sealing effect of the connection is improved.

[0040] Further, the friction protection gasket 7 and the transmission gear 8 are located below the installation end cover 2, the end portion of the micro motor shell 1 is sealed by the installation end cover 2, and dust is prevented from entering the connection between the transmission gear 8 and the rotor driving gear 6.

[0041] Further, the other end of the conical gasket 71 above the transmission gear 8 is attached to the outer shaft 41, and the other end of the conical gasket 71 below the transmission gear 8 is attached to the rivet head 42, and the outer shaft 41, the conical gasket 71 and the transmission gear 8 are riveted through the rivet head 42.

[0042] The working principle of the utility model is: before use, first, two conical washers 71 are symmetrically pasted to the two ends of the transmission gear 8 respectively, then the gear mounting shaft 44 of the end part of the outer shaft 41 is penetrated through the through hole 72 and the transmission gear 8, and the whole is placed on the riveting equipment, at this time, the end part of the gear mounting shaft 44 has no gear mounting shaft 44, only the reserved annular protrusion, then the annular protrusion is pressed by using the pressure of the riveting equipment, the annular protrusion is pressed into the riveting head 42 of the end part of the gear mounting shaft 44, the conical washer 71 and the transmission gear 8 are tightly connected in the riveting process, the transmission gear 8 is fixed at the end part of the outer shaft 41 through the friction force between the conical washer 71, the gear mounting shaft 44 drives the outer shaft 41 to rotate through the meshing with the transmission gear 8, when the load of the end part of the outer shaft 41 exceeds the maximum load of the motor (that is, the load exceeds the friction force between the transmission gear 8 and the conical washer 7), the transmission gear 8 rotates between the two conical washers 71, thereby playing the role of overload protection to the rotor driving gear 6, and the structure is simple.

[0043] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure mark in the claims should not be regarded as limiting the involved claims.

[0044] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, the skilled person should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that can be understood by the skilled person.

Claims

1. An electric machine having overload protection, characterized by: The micro motor shell (1) is fixedly connected with the mounting end cover (2) at the end, and the motor driving shaft (4) penetrates through the mounting end cover (2), and the bottom of the motor driving shaft (4) is riveted with the friction protection pad (7) and the transmission gear (8). The motor driving shaft (4) comprises an outer shaft (41) movably connected with the mounting end cover (2), and the bottom of the outer shaft (41) is integrally provided with a gear mounting shaft (44) fixed with the friction protection pad (7) and the transmission gear (8), and the end of the gear mounting shaft (44) is further integrally provided with a positioning shaft head (43).

2. An electric machine with overload protection according to claim 1, characterized in that: The transmission gear (8) is sleeved on the gear mounting shaft (44), and the two ends of the transmission gear (8) are provided with the friction protection pad (7), and the two friction protection pads (7) are symmetrically arranged, and the other end of the gear mounting shaft (44) is further integrally provided with a riveting head (42) for fixing the friction protection pad (7).

3. An electric machine with overload protection according to claim 2, characterized in that: The friction protection pad (7) comprises a tapered pad (71) arranged in a tapered shape, and a through hole (72) is formed in the tapered pad (71), and the end of the gear mounting shaft (44) penetrates through the through hole (72), and the end of the tapered pad (71) is integrally provided with a symmetric positioning clamping plate (73).

4. An electric machine with overload protection according to claim 3, characterized in that: The end of the tapered pad (71) away from the positioning clamping plate (73) is attached to the transmission gear (8), and the end of the outer shaft (41) close to the gear mounting shaft (44) is provided with a positioning clamping groove (45) corresponding to the positioning clamping plate (73), and the positioning clamping plate (73) is clamped in the positioning clamping groove (45).

5. An electric machine with overload protection according to claim 4, characterized in that: The micro motor shell (1) is provided with a retainer (5) inserted and matched with the micro motor shell (1) above the rotor driving gear (6), and the end of the rotor driving gear (6) penetrates through the retainer (5) and extends above the retainer (5).

6. An electric machine with overload protection according to claim 5, characterized in that: The motor driving shaft (4) is located above the retainer (5), and the positioning shaft head (43) in the motor driving shaft (4) is inserted and matched with the retainer (5), and the transmission gear (8) mounted at the bottom of the motor driving shaft (4) is meshed with the end of the rotor driving gear (6) extending above the retainer (5).

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