CN216812581U - Torque structure for motor overload protection - Google Patents
Torque structure for motor overload protection Download PDFInfo
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- CN216812581U CN216812581U CN202123370739.6U CN202123370739U CN216812581U CN 216812581 U CN216812581 U CN 216812581U CN 202123370739 U CN202123370739 U CN 202123370739U CN 216812581 U CN216812581 U CN 216812581U
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Abstract
The utility model relates to the field of motor structures, in particular to a torque structure for motor overload protection. The utility model aims to provide a torque structure for motor overload protection, which is simple in structure, the motor rotating shaft is a hollow external spline shaft, the torque shaft sleeve is an internal spline shaft with a two-stage step shape in the torque shaft sleeve, the torque shaft is a solid external spline shaft and is sleeved in the motor rotating shaft, the torque shaft is in clearance fit with the motor rotating shaft, two ends of the torque shaft are exposed out of the motor rotating shaft, a part with a small inner diameter of the torque shaft sleeve is meshed with one end of the torque shaft, a part with a large inner diameter of the torque shaft sleeve is meshed with the part of the motor rotating shaft, which is exposed out of the motor, a first clearance is arranged between the end surface of the part with the large inner diameter of the torque shaft sleeve and the end surface of the shaft outlet end of the motor, a second clearance is arranged between the fixed plate and the end surface of the motor shaft outlet end, and the fixed plate is detachably and fixedly connected.
Description
Technical Field
The utility model relates to the field of motor structures, in particular to the technical field of motor overload protection, and specifically relates to a torque structure for motor overload protection.
Background
With the rapid development of national economy, the number of major engineering construction projects in China is increasing day by day, and as one of large-scale engineering machines, the shield tunneling machine is widely applied to the field of full-face excavation of subways, hydraulic engineering, railways, highway tunnels and the like. The motor provides drive power for the cutter head of the tunnel construction shield machine, and the motor for the shield machine is frequently overloaded instantly due to the variable working environment of the shield machine, so that the damage of the motor is caused.
In the prior art, such as an electric motor with a mechanical overload protection structure disclosed in patent No. 201320146581.0, the utility model meshes a hollow output shaft of the electric motor and a torque shaft for transmitting torque through a torque limiting coupling. The torque limiting coupler has the advantages that the torque limiting coupler is provided with the high-pressure oil cavity and the shearing pipe, when the motor is in severe overload, the shearing pipe is sheared, high-pressure oil in the torque limiting coupler is released, the hollow shaft of the motor is separated from the torque shaft, and the motor is in no-load, so that the effect of protecting the motor is achieved.
Disclosure of Invention
The utility model aims to provide a torque structure for motor overload protection, which is simple in structure.
The utility model is realized by adopting the following technical scheme:
a torque structure for motor overload protection comprises a motor rotating shaft, a torque shaft sleeve, a speed reducer and a fixing plate, wherein one end of the motor rotating shaft is exposed out of the shaft outlet end of a motor, the torque shaft is a hollow external spline shaft, the torque shaft sleeve is an internal spline shaft with a two-stage step shape inside, the torque shaft is a solid external spline shaft and is sleeved in the motor rotating shaft, the torque shaft is in clearance fit with the motor rotating shaft, two ends of the torque shaft are exposed out of the motor rotating shaft, the stress concentration point of the torque shaft is positioned in the motor rotating shaft, the part with a small inner diameter of the torque shaft sleeve is meshed with one end of the torque shaft, the part with a large inner diameter of the torque shaft sleeve is meshed with the part of the motor rotating shaft, a first clearance is arranged between the end face of the part with a large inner diameter of the torque shaft sleeve and the end face of the shaft outlet end of the motor, the fixing plate is sleeved on the motor rotating shaft and positioned in the first clearance, and a second clearance is arranged between the fixing plate and the end face of the shaft outlet end of the motor, the end face of the torque shaft sleeve, which is close to the motor, is detachably and fixedly connected with the fixing plate, and the other end of the torque shaft is meshed with the spline hole of the speed reducer. The working principle is as follows: when the motor rotating shaft rotates, the motor rotating shaft and the torque shaft are in clearance fit, so that the torque shaft cannot directly rotate along with the motor rotating shaft, the torque shaft sleeve rotates along with the motor rotating shaft and transmits torque to the torque shaft sleeve through the fixed plate and the meshing of the part with the large inner diameter of the torque shaft sleeve and the motor rotating shaft, and the part with the small inner diameter of the torque shaft sleeve is meshed with the torque shaft, so that the torque shaft sleeve transmits the torque to the torque shaft, the torque shaft runs, then the torque shaft drives the speed reducer to run.
The beneficial effects produced by the utility model are as follows: the torque structure for motor overload protection is widely applied to the field of shield machines or other large engineering equipment, the torque shaft plays a role in transmitting torque between the motor and a transmission system, and when the motor is in the worst working condition due to severe overload, the torque shaft can be broken at a stress concentration point, so that the transmission system is protected, the structure is simple, the manufacturing cost is low, and frequent maintenance is not needed.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: the motor comprises a motor 1, a motor 2, a fixing plate 3, a motor rotating shaft 3, a torque shaft sleeve 4, a torque shaft 5, a speed reducer 6, a connecting part 7, a clamping groove 8, a clamping ring 9 and a V-shaped groove 10.
Detailed Description
As shown in fig. 1, a torque structure for motor overload protection includes a motor shaft 3 with one end exposed out of an output shaft end of a motor 1, a torque shaft 5, a torque shaft sleeve 4, a speed reducer 6 with a spline hole, and a fixing plate 2, where the motor shaft 3 is a hollow external spline shaft, the torque shaft sleeve 4 is an internal spline shaft with a two-stage step shape therein, the torque shaft 5 is a solid external spline shaft and is internally sleeved in the motor shaft 3, the torque shaft 5 is in clearance fit with the motor shaft 3 and has two ends exposed out of the motor shaft 3, a stress concentration point of the torque shaft 5 is located in the motor shaft 3, a small-inner-diameter portion of the torque shaft sleeve 4 is engaged with one end of the torque shaft 5, a large-inner-diameter portion of the torque shaft sleeve 4 is engaged with the portion of the motor shaft 3 exposed out of the motor 1, a first gap is provided between an end face of the large-inner-diameter portion of the torque shaft sleeve 4 and an output shaft end face of the motor 1, the fixing plate 2 is externally sleeved on the motor shaft 3 and is located in the first gap, a second gap is formed between the end face of the shaft outlet end of the fixed plate 2 and the motor 1, the end face, close to the motor 1, of the torque shaft sleeve 4 is detachably and fixedly connected with the fixed plate 2, and the other end of the torque shaft 5 is meshed with a spline hole of the speed reducer 6. The working principle is as follows: when the motor shaft 3 rotates, because the motor shaft 3 is in clearance fit with the torque shaft 5, the torque shaft 5 does not directly rotate along with the motor shaft 3, but the torque shaft sleeve 4 rotates along with the motor shaft 3 and transmits the torque to the torque shaft sleeve 4 through the meshing of the fixing plate 2 and the part with the large inner diameter of the torque shaft sleeve 4 and the motor shaft 3, because the part with the small inner diameter of the torque shaft sleeve 4 is meshed with the torque shaft 5, the torque shaft sleeve 4 transmits the torque to the torque shaft 5, the torque shaft 5 operates, then the torque shaft 5 drives the speed reducer 6 to operate, when the motor 1 is in the worst working condition due to serious overload, the torque shaft 5 can be broken at the stress concentration point, so that the motor 1 is protected, after the torque shaft 5 is broken, the broken torque shaft 5 can be taken out only by disassembling the connection between the fixing plate 2 and the torque shaft sleeve 4, the torque shaft 5 is then replaced and the motor 1 can be put back into operation.
During specific implementation, the end part of the large-inner-diameter part of the torque shaft sleeve 4 extends outwards along the diameter of the torque shaft sleeve 4 to form a connecting part 7, and the connecting part 7 is detachably and fixedly connected with the fixing plate 2, so that the connection between the torque shaft sleeve 4 and the motor rotating shaft 3 is more stable. The inner circumferential surface of the end part of the torque shaft sleeve 4 with the large inner diameter is provided with an annular clamping groove 8, the outer circumferential surface of the motor rotating shaft 3 is integrally provided with an annular clamping ring 9 which is coaxial with the motor rotating shaft 3 and is matched with the clamping groove 8, and the structure can better prevent the torque shaft sleeve 4 from falling off from the motor rotating shaft 3. The connecting part 7 is fixedly connected with the fixing plate 2 through a bolt, and clamps a snap ring 9 on the motor rotating shaft 3. A rubber sealing ring with a sealing function is arranged between the clamping groove 8 and the clamping ring 9.
In the embodiment, one end of the part with the small inner diameter of the torque shaft sleeve 4 is opened and closed, so that the structure is more stable, safe and reliable. The stress concentration point of the torque shaft 5 is provided with a V-shaped groove 10 with the bottom being in an arc shape, so that the torque shaft 5 is not excessively concentrated in stress, and the phenomenon of frequent breakage of the torque shaft 5 in the use process is reduced.
Claims (9)
1. A torque structure for motor overload protection is characterized by comprising a motor rotating shaft (3) with one end exposed out of the shaft outlet end of a motor (1), a torque shaft (5), a torque shaft sleeve (4), a speed reducer (6) provided with a spline hole and a fixing plate (2), wherein the motor rotating shaft (3) is a hollow external spline shaft, the torque shaft sleeve (4) is an internal spline shaft with a two-stage step shape, the torque shaft (5) is a solid external spline shaft and is sleeved in the motor rotating shaft (3), the torque shaft (5) is in clearance fit with the motor rotating shaft (3) and two ends of the torque shaft are exposed out of the motor rotating shaft (3), a stress concentration point of the torque shaft (5) is positioned in the motor rotating shaft (3), the part with a small inner diameter of the torque shaft sleeve (4) is meshed with one end of the torque shaft (5), the part with a large inner diameter of the torque shaft sleeve (4) is meshed with the part of the motor rotating shaft (3) exposed out of the motor (1), be equipped with first clearance between the terminal surface of the big part of moment of torsion axle sleeve (4) internal diameter and the play axle head terminal surface of motor (1), fixed plate (2) overcoat is on motor shaft (3) and be located first clearance, be equipped with the second clearance between fixed plate (2) and motor (1) play axle head terminal surface, fixed connection can be dismantled with fixed plate (2) to the terminal surface that is close to motor (1) of moment of torsion axle sleeve (4), the other end of moment of torsion axle (5) and the splined hole meshing of reduction gear (6).
2. A torque structure for overload protection of an electric motor according to claim 1, wherein the end of the large inner diameter part of the torque sleeve (4) extends outwards along the diameter of the torque sleeve (4) to form a connecting part (7), and the connecting part (7) is detachably and fixedly connected with the fixed plate (2).
3. The torque structure for motor overload protection according to claim 2, wherein the torque sleeve (4) has an annular groove (8) on the inner circumferential surface of the end of the portion with the larger inner diameter, and the motor shaft (3) has an annular snap ring (9) on the outer circumferential surface thereof, the annular snap ring being coaxial with the motor shaft (3) and fitting with the groove (8).
4. A torque structure for overload protection of an electric motor according to claim 3, characterized in that the connecting part (7) is fixedly connected with the fixed plate (2) by bolts.
5. A torque structure for overload protection of an electric motor according to claim 1 or 2 or 3 or 4, characterized in that the part of the torque bushing (4) with a small inner diameter is closed at one end by an opening.
6. A torque structure for overload protection of an electric motor according to claim 1 or 2 or 3 or 4, characterized in that V-grooves (10) are provided at stress concentration points of the torque shaft (5).
7. A torque structure for overload protection of an electric motor according to claim 5, characterized in that V-grooves (10) are provided at stress concentration points of the torque shaft (5).
8. A torque structure for overload protection of an electric motor according to claim 7, characterized in that the bottom of the V-groove (10) is rounded.
9. The torque structure for motor overload protection according to claim 8, wherein a rubber sealing ring for sealing is arranged between the clamping groove (8) and the clamping ring (9).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202123370739.6U CN216812581U (en) | 2021-12-30 | 2021-12-30 | Torque structure for motor overload protection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202123370739.6U CN216812581U (en) | 2021-12-30 | 2021-12-30 | Torque structure for motor overload protection |
Publications (1)
Publication Number | Publication Date |
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CN216812581U true CN216812581U (en) | 2022-06-24 |
Family
ID=82061908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN202123370739.6U Active CN216812581U (en) | 2021-12-30 | 2021-12-30 | Torque structure for motor overload protection |
Country Status (1)
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CN (1) | CN216812581U (en) |
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2021
- 2021-12-30 CN CN202123370739.6U patent/CN216812581U/en active Active
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