One-way self-locking motor for linear driving

Abstract

The utility model discloses a one-way self-locking motor for linear driving, belongs to the field of actuators, solves the problem that chippings can enter a rotor to influence the operation of the motor, and adopts the technical scheme that the one-way self-locking motor mainly comprises a motor shaft, a motor body, and the rotor and a stator which are arranged in the motor body, a worm and gear mechanism is arranged at the output end of the motor shaft, the tail end of the motor shaft penetrates out of the motor body, the motor shaft can axially move while rotating relative to the motor body, a brake part and an elastic pre-tightening part arranged on the brake part in a sleeving mode are arranged on the portion, located on the tail end side of the motor shaft, outside the motor body, and the brake part is provided with a penetrating hole for the tail end of the motor shaft to penetrate in. The motor shaft moves in the opposite direction in the reverse rotation state, the tail end of the motor shaft makes contact with the inner wall of the penetrating hole and extrudes the brake part to generate external expansion deformation, and the elastic pre-tightening part tightly holds the brake part so that the brake part can exert pre-tightening force on the motor shaft in the reverse rotation state to achieve self-locking. According to the utility model, chippings entering the rotor are effectively reduced, and the motor operation stability is improved.

Description

Technical Field

[0001] The utility model relates to the field of actuators, in particular to a one-way self-locking motor for linear driving. Background Art

[0002] In the prior art, for example, the invention patent CN117175841A discloses a sliding shaft self-locking motor and a method of using the motor, comprising a motor sleeve, a front cover and a rear cover are respectively provided at both ends of the motor sleeve, a stator is fixed on the inner side of the motor sleeve, a rotor is provided on the inner side of the stator, a motor shaft is provided axially upwardly of the rotor, one end of the motor shaft is rotatably connected to the rear cover, the other end of the motor shaft is rotatably connected to the front cover, a worm gear housing is provided on the front cover, a worm connected to the motor shaft is provided in the worm gear housing, a worm wheel is provided on one side of the worm, a drive shaft is provided axially upwardly of the worm gear, the drive shaft is rotatably connected to the worm gear housing, and one end of the drive shaft extends out of the worm gear housing; the motor shaft is slidably connected to the front cover, and the motor shaft is slidably connected to the rear cover; a brake is provided between the motor shaft and the rear cover, although the wear-resistant gasket can provide a self-locking force by friction with the motor shaft, the wear-resistant gasket is easily worn and generates debris, and since the brake and the rotor are both arranged inside the motor sleeve, the debris will enter the rotor and affect the operation of the motor. Utility Model Content

[0003] The purpose to be achieved by the utility model is to provide a one-way self-locking motor for linear drive, which solves the problem that debris will enter the rotor and affect the operation of the motor, effectively reduces the amount of debris entering the rotor, and improves the stability of the motor operation.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a one-way self-locking motor for linear drive, comprising a motor shaft, a motor body, and a rotor and a stator arranged in the motor body, the output end of the motor shaft is provided with a worm gear mechanism, the tail end of the motor shaft passes through the motor body, and the motor shaft can move axially while rotating relative to the motor body, the motor body is provided with a brake member and an elastic preload member sleeved on the brake member on the tail end side of the motor shaft, the brake member is provided with a through hole for the tail end of the motor shaft to pass through, the motor shaft moves toward the output end of the motor shaft in the forward rotation state, so that the tail end of the motor shaft is separated from the inner wall of the through hole, and the motor shaft moves in the opposite direction in the reverse rotation state, so that the tail end of the motor shaft contacts the inner wall of the through hole and squeezes the brake member to cause outward expansion deformation, and the elastic preload member holds the brake member so that the brake member applies a preload force to the motor shaft in the reverse state to achieve self-locking.

[0005] After adopting the above technical scheme, the utility model has the following advantages: first, the brake part is arranged outside the motor body, so that the brake part and the rotor are separated, thereby increasing the difficulty of the debris generated on the brake part entering the motor body, thereby effectively reducing the contact of the debris with the rotor and improving the stability of the motor operation. Secondly, when the brake part is worn out due to long-term use and needs to be replaced or maintained, the operation is more convenient and quick, and there is no need to disassemble the motor body, which reduces the maintenance workload and reduces the maintenance cost. Then, the brake part will generate heat when working. Placing it outside the motor body helps the heat to dissipate faster, avoids the internal temperature of the motor from being too high, and is conducive to the long-term stable operation and extended service life of the motor. Then, placing the brake part outside the motor reduces the space occupied in the motor body, leaving installation space for other internal components, which helps to improve the overall performance of the motor. Finally, by setting the brake part and the elastic preload part sleeved on the brake part, and by adjusting the elastic preload part on the brake part, it can flexibly adapt to different load conditions and self-locking force requirements, enhance the adaptability of the motor in a variety of application environments, and improve the flexibility of the motor.

[0006] Furthermore, the motor body is provided with a through hole through which the tail end of the motor shaft passes, and the motor shaft is sleeved with an oil-containing bearing, which is installed in the through hole to fill the installation gap between the motor shaft and the inner wall of the through hole.

[0007] By adopting the above technical solution, the use of oil-containing bearings simplifies the assembly process of the motor, eliminates the need to frequently add lubricating oil, and reduces maintenance workload. The bearings are directly installed in the through holes of the motor body, which not only fills the gaps, prevents external pollutants such as dust and moisture from entering the motor, protects the internal structure of the motor, but also ensures the central positioning of the motor shaft, improving the accuracy and efficiency of assembly.

[0008] Furthermore, it also includes a mounting seat for installing the braking member and the elastic preload member, the mounting seat is arranged on the motor body at the rear end side of the motor shaft, the mounting seat is provided with a accommodating cavity for accommodating the braking member and the elastic preload member, and the mounting seat is installed on the motor body to close the accommodating cavity through the motor body.

[0009] The above-mentioned technical solution is adopted, and the leakage of debris generated by the brake component is reduced by designing a closed accommodating cavity of the motor body.

[0010] Furthermore, the mounting seat is provided with a heat dissipation hole connecting the accommodating cavity and the external space.

[0011] By adopting the above-mentioned technical solution, the brake parts will generate heat when working. The presence of the heat dissipation holes can allow the heat in the accommodating cavity to be quickly dissipated to the external environment through natural convection or forced ventilation, effectively reducing the accumulation of heat generated by friction or current in the brake parts and elastic preload parts during operation, preventing performance degradation or component damage caused by overheating, and ensuring the service life of the motor and its components.

[0012] Furthermore, the brake member includes a mounting ring and a plurality of radially deformable friction arms mounted on the mounting ring. The plurality of friction arms are arranged along the circumferential direction of the motor shaft to form through holes, and deformation gaps are provided between the friction arms to allow the friction arms to deform.

[0013] By adopting the above-mentioned technical solution, multiple friction arms are evenly arranged along the circumferential direction of the motor shaft, ensuring that the friction force can be evenly distributed in the circumference of the motor shaft during braking, thereby providing reliable self-locking force. Secondly, the radially deformable friction arm design enables the friction arm to automatically deform as needed when the motor shaft reverses, thereby increasing the contact area with the rear end of the motor shaft, further increasing the friction force, and further providing reliable self-locking force.

[0014] Furthermore, the mounting ring is provided with a limiting rib extending radially outward, and the mounting seat is provided with a limiting groove adapted to the limiting rib, and the limiting rib is inserted into the limiting groove to limit the circumferential rotation of the brake member.

[0015] Through the above technical solution, the cooperation between the limiting rib and the limiting groove can accurately define the position of the brake component, prevent unnecessary circumferential rotation during installation or use, and thus provide a reliable self-locking force for the motor shaft.

[0016] Furthermore, the motor body is located above the limiting rib, and the groove wall of the limiting groove is located below the limiting rib to limit the axial movement of the brake member.

[0017] Through the above technical solution, through the upper and lower cooperation of the motor body and the limit groove, the axial movement range of the brake part can be very accurately limited, avoiding excessive movement of the brake part during the operation of the motor, ensuring that the self-locking mechanism works effectively within the design range, and improving the stability and safety of the system.

[0018] Furthermore, the mounting seat is detachably connected to the motor body via a fastener.

[0019] Through the above technical solution, the detachable connection method allows the mounting base to be directly removed when the brake parts and elastic preload parts need to be maintained or replaced, without the need to disassemble the motor body on a large scale, which greatly simplifies the maintenance and overhaul process and reduces maintenance costs and time.

[0020] Furthermore, the tail end of the motor shaft is a conical structure with a diameter decreasing from the output end of the motor shaft toward the tail end of the motor shaft, and the diameter of the through hole decreases from large to small to match the tail end of the motor shaft.

[0021] Through the above technical solution, as the perforation and the tapered shaft end fit closely, the contact area increases, which can provide better friction.

[0022] Furthermore, a support bearing is sleeved on the output end of the motor shaft, and a corrugated gasket is provided between the support bearing and the motor body to supplement the axial gap between the support bearing and the motor body.

[0023] Through the above technical solution, a corrugated gasket is used between the support bearing and the motor body to supplement the axial gap between the motor shaft and the motor body to ensure that the rotor inside the motor does not move excessively. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of a one-way self-locking motor for linear drive of the utility model;

[0026] Figure 2 It is a cross-sectional view of the one-way self-locking motor used for linear drive when the motor shaft of the utility model is in a reverse state;

[0027] Figure 3 For the utility model Figure 2 A magnified view of the structure at center;

[0028] Figure 4 For the utility model Figure 2 A magnified view of the structure at B in the middle;

[0029] Figure 5 It is an exploded view of the one-way self-locking motor for linear drive of the utility model;

[0030] Figure 6 It is a schematic diagram of the structure of the brake component and the brake preload component of the utility model;

[0031] Figure 7 It is a structural schematic diagram of the brake component of the utility model;

[0032] Figure 8 It is a structural schematic diagram of a one-way self-locking motor used for linear drive when the motor shaft of the utility model is in a forward rotation state;

[0033] In the figure, 100, motor body; 110, motor shaft; 111, output end; 112, tail end; 120, rotor; 130, stator; 140, through hole; 150, oil-containing bearing; 160, support bearing; 170, corrugated gasket; 200, worm; 210, worm wheel; 300, brake member; 310, mounting ring; 311, limiting rib; 320, friction arm; 330, through hole; 340, deformation gap; 400, elastic preload member; 500, mounting seat; 510, accommodating cavity; 520, heat dissipation hole; 530, limiting groove. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0035] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0036] It should be understood that in various embodiments of the present invention, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0037] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0038] It should be understood that in the present utility model, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0039] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0040] like Figures 1 to 8 As shown, the utility model provides a one-way self-locking motor for linear drive, which is used to drive the movement of a load and is mainly used for the lifting of a lifting table. The one-way self-locking motor for linear drive includes a motor shaft 110, a motor body 100, and a rotor 120 and a stator 130 arranged in the motor body 100. The rotor 120 is fixedly connected to the motor shaft 110. The output end 111 of the motor shaft 110 is provided with a worm gear mechanism. The worm gear mechanism includes a worm 200 fixedly connected to the output end 111 of the motor shaft 110, and a worm wheel 210 meshing with the worm 200. The tail end 112 of the motor shaft 110 passes through the motor body 100. The motor shaft 110 can move axially while rotating relative to the motor body 100. A brake component 300 and an elastic preload component 400 sleeved on the brake component 300 are provided on the outside of the machine body 100 at the side of the tail end 112 of the motor shaft 110. The brake component 300 is provided with a through hole 330 for the tail end 112 of the motor shaft 110 to penetrate. When the motor shaft 110 is in a forward rotation state, it moves toward the direction of the output end 111 of the motor shaft 110, so that the tail end 112 of the motor shaft 110 is separated from the inner wall of the through hole 330. When the motor shaft 110 is in a reverse rotation state, it moves in the opposite direction, so that the tail end of the motor shaft 110 contacts the inner wall of the through hole 330 and squeezes the brake component 300 to cause outward expansion deformation. The elastic preload component 400 holds the brake component 300 tightly so that the brake component 300 applies a preload force to the motor shaft 110 in the reverse state to achieve self-locking.

[0041] First, the brake member 300 is arranged outside the motor body 100, so that the brake member 300 and the rotor 120 are separated, thereby increasing the difficulty of debris generated on the brake member 300 entering the interior of the motor body 100, thereby effectively reducing the contact of the debris with the rotor 120 and improving the stability of the motor operation. Secondly, when the brake member 300 is worn out due to long-term use and needs to be replaced or maintained, the operation is more convenient and quick, and there is no need to disassemble the motor body 100, thereby reducing the maintenance workload and reducing the maintenance cost. Then, the brake member 300 will generate heat when working. Placing it outside the motor body 100 helps to dissipate the heat faster, avoiding excessive internal temperature of the motor, which is beneficial to the long-term stable operation and extended service life of the motor. Next, placing the brake member 300 outside the motor reduces the space occupied by the motor body 100, leaving installation space for other internal components, which helps to improve the overall performance of the motor. Finally, a brake component 300 and an elastic preload component 400 mounted on the brake component 300 are provided. By adjusting the elastic preload component 400 on the brake component 300, it is possible to flexibly adapt to different load conditions and self-locking force requirements, thereby enhancing the adaptability of the motor in various application environments and improving the flexibility of the motor use.

[0042] In order to enhance the self-locking force, the tail end 112 of the motor shaft 110 is a conical structure with a diameter decreasing from the output end 111 of the motor shaft 110 toward the tail end 112 of the motor shaft 110. The diameter of the through hole 330 is adapted from large to small to the tail end 112 of the motor shaft 110. As the through hole 330 fits tightly with the tapered shaft end, the contact area increases, which can provide better friction.

[0043] Among them, the motor body 100 is provided with a through hole 140 through which the tail end of the motor shaft 110 passes, and an oil-containing bearing 150 is sleeved on the motor shaft 110, so there is no need to frequently add lubricating oil, which reduces the maintenance workload. The oil-containing bearing 150 is installed in the through hole 140 to fill the installation gap between the motor shaft 110 and the inner wall of the through hole 140 to prevent external pollutants such as dust and moisture from entering the interior of the motor, thereby protecting the internal structure of the motor, ensuring the center positioning of the motor shaft 110, and improving the accuracy and efficiency of assembly.

[0044] In order to install the brake member 300 and the elastic preload member 400, a mounting seat 500 for mounting the brake member 300 and the elastic preload member 400 is also included. The mounting seat 500 is arranged on the motor body 100 at the side of the tail end 112 of the motor shaft 110. The mounting seat 500 is provided with a accommodating cavity 510 for accommodating the brake member 300 and the elastic preload member 400. The mounting seat 500 is installed on the motor body 100 to close the accommodating cavity 510 through the motor body 100 to reduce the leakage of debris generated by the brake member 300.

[0045] Due to the requirements of different load conditions and self-locking force, it is necessary to adjust the elastic preload member 400 on the brake member 300. In order to improve the flexibility of adjustment, the mounting base 500 is detachably connected to the motor body 100 through fasteners. The detachable connection method makes it possible to directly remove the mounting base 500 when the brake member 300 and the elastic preload member 400 need to be maintained or replaced, without the need to disassemble the motor body 100 on a large scale, which greatly simplifies the maintenance and overhaul process and reduces maintenance costs and time.

[0046] Specifically, the fastener can be a fastening screw, and the disassembly solution is also reliable for the installation between the mounting base 500 and the motor body 100.

[0047] The brake member 300 specifically includes a mounting ring 310, and a plurality of radially deformable friction arms 320 mounted on the mounting ring 310. The plurality of friction arms 320 are arranged along the circumferential direction of the motor shaft 110 to form a through hole 330, ensuring that during braking, the friction force can be evenly distributed in the circumferential direction of the motor shaft 110, thereby providing a reliable self-locking force. A deformation gap 340 is provided between the friction arms 320 for the friction arms 320 to deform, so that when the motor shaft 110 is reversed, the friction arms 320 can automatically deform as needed, increase the contact area with the tail end 112 of the motor shaft 110, further increase the friction force, and further provide a reliable self-locking force. The elastic preload member 400 is located on the side away from the mounting ring 310.

[0048] In order to further ensure that a stable self-locking force is provided to the motor shaft 110, a limiting rib 311 extending radially outward is provided on the mounting ring 310, and a limiting groove 530 adapted to the limiting rib 311 is provided on the mounting seat 500. After the limiting rib 311 is inserted into the limiting groove 530, the circumferential rotation of the brake member 300 is limited, thereby providing a reliable self-locking force to the motor shaft 110.

[0049] In addition, the motor body 100 is located above the limiting rib 311, and the groove wall of the limiting groove 530 is located below the limiting rib 311 to limit the axial movement of the brake member 300, thereby preventing the brake member 300 from excessive movement during the operation of the motor, ensuring that the self-locking mechanism works effectively within the design range, and improving the stability and safety of the system.

[0050] In order to further quickly dissipate the heat generated by the friction between the brake component 300 and the motor shaft 110, a heat dissipation hole 520 connecting the accommodating cavity 510 and the external space is provided on the mounting base 500. The heat in the accommodating cavity 510 is quickly dissipated to the external environment through natural convection or forced ventilation, thereby effectively reducing the heat accumulation generated by friction or current in the brake component 300 and the elastic preload component 400 during operation, preventing performance degradation or component damage caused by overheating, and ensuring the service life of the motor and its components.

[0051] It should be noted that the friction arm 320 is made of a material with a high melting point and high wear resistance, and the elastic preload member 400 can be a spring ring.

[0052] Since the rotor 120 in the present application can be raised and lowered along with the motor shaft 110, in order to improve the operating stability of the rotor 120, a support bearing 160 is sleeved on the output end 111 of the motor shaft 110, and a corrugated gasket 170 is provided between the support bearing 160 and the motor body 100 to supplement the axial gap between the support bearing 160 and the motor body 100, so as to ensure that the rotor 120 inside the motor does not move excessively.

[0053] When using, Figure 8 As shown, when the motor shaft 110 is in the forward rotation state, it moves toward the output end 111 of the motor shaft 110, so that the tail end 112 of the motor shaft 110 is separated from the inner wall of the through hole 330, and the brake member 300 does not provide a self-locking force to the motor shaft 110. The motor shaft 110 drives the worm 200 to rotate, and the worm 200 drives the worm wheel 210 to rotate, so as to drive the load to move. Figures 1 to 4 As shown, when the motor is powered off, the load has a tendency to slide down, and this tendency acts on the worm gear 210 and causes it to rotate counterclockwise. At this time, the counterclockwise rotation of the worm gear 210 drives the motor shaft 110 to move in the opposite direction when it is in the reverse state, so that the tail end 112 of the motor shaft 110 contacts the inner wall of the through hole 330 and squeezes the brake member 300 to deform in the radial direction. The elastic preload member 400 applies a preload force to the brake member 300 in the radial direction of the through hole 330, and friction is generated between the tail end 112 of the motor shaft 110 and the brake member 300. The friction provided by the brake member 300 will increase with the increase of the load, thereby locking the entire device.

[0054] It can be understood that in other embodiments, the corrugated gasket may also be provided between the oil-containing bearing and the motor body to supplement the axial gap between the oil-containing bearing and the motor body.

[0055] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A one-way self-locking motor for linear drive, comprising a motor shaft, a motor body, and a rotor and a stator arranged in the motor body, wherein a worm gear mechanism is arranged at the output end of the motor shaft, and the tail end of the motor shaft passes through the motor body, characterized in that: The motor shaft can rotate relative to the motor body and move axially at the same time. A brake component and an elastic preload component sleeved on the brake component are provided on the tail end side of the motor shaft outside the motor body. The brake component is provided with a through hole for the tail end of the power supply shaft to penetrate. When the motor shaft is in a forward rotation state, it moves toward the output end of the motor shaft so that the tail end of the motor shaft is separated from the inner wall of the through hole. When the motor shaft is in a reverse rotation state, it moves in the opposite direction so that the tail end of the motor shaft contacts the inner wall of the through hole and squeezes the brake component to cause outward expansion deformation. The elastic preload component holds the brake component so that the brake component applies a preload force to the motor shaft in the reverse state to achieve self-locking.

2. The one-way self-locking motor for linear drive according to claim 1, characterized in that: The motor body is provided with a through hole through which the tail end of the motor shaft passes, and the motor shaft is sleeved with an oil-containing bearing, which is installed in the through hole to fill the installation gap between the motor shaft and the inner wall of the through hole.

3. The one-way self-locking motor for linear drive according to claim 1, characterized in that: It also includes a mounting seat for installing the brake member and the elastic preload member. The mounting seat is arranged on the motor body at one side of the tail end of the motor shaft. The mounting seat is provided with a receiving cavity for receiving the brake member and the elastic preload member. The mounting seat is installed on the motor body to close the receiving cavity through the motor body.

4. The one-way self-locking motor for linear drive according to claim 3, characterized in that: The mounting seat is provided with a heat dissipation hole connecting the accommodating cavity and the external space.

5. The one-way self-locking motor for linear drive according to claim 3, characterized in that: The brake member includes a mounting ring and a plurality of radially deformable friction arms mounted on the mounting ring. The plurality of friction arms are arranged along the circumferential direction of the motor shaft to form through holes. A deformation gap is provided between the friction arms for the friction arms to deform.

6. The one-way self-locking motor for linear drive according to claim 5, characterized in that: The mounting ring is provided with a limiting rib extending radially outward, and the mounting seat is provided with a limiting groove matched with the limiting rib. After the limiting rib is inserted into the limiting groove, the circumferential rotation of the brake member is limited.

7. The one-way self-locking motor for linear drive according to claim 6, characterized in that: The motor body is located above the limiting rib, and the groove wall of the limiting groove is located below the limiting rib to limit the axial movement of the braking member.

8. The one-way self-locking motor for linear drive according to claim 3, characterized in that: The mounting seat is detachably connected to the motor body via a fastener.

9. The one-way self-locking motor for linear drive according to claim 1, characterized in that: The tail end of the motor shaft is a cone structure with a diameter from large to small in the direction from the output end of the motor shaft toward the tail end of the motor shaft, and the diameter of the through hole is from large to small to match the tail end of the motor shaft.

10. The one-way self-locking motor for linear drive according to claim 1, characterized in that: A support bearing is sleeved on the output end of the motor shaft, and a corrugated gasket is arranged between the support bearing and the motor body to supplement the axial gap between the support bearing and the motor body.

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