CN110994878A - Motor rotating shaft structure and method for connecting motor and load - Google Patents
Motor rotating shaft structure and method for connecting motor and load Download PDFInfo
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- CN110994878A CN110994878A CN201911024532.8A CN201911024532A CN110994878A CN 110994878 A CN110994878 A CN 110994878A CN 201911024532 A CN201911024532 A CN 201911024532A CN 110994878 A CN110994878 A CN 110994878A
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- rotating shaft
- mandrel
- motor
- load
- shaft body
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
- F16C3/023—Shafts; Axles made of several parts, e.g. by welding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
- F16D1/033—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like by clamping together two faces perpendicular to the axis of rotation, e.g. with bolted flanges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
- F16D1/04—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like with clamping hub; with hub and longitudinal key
- F16D1/05—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention relates to the technical field of motor transmission, in particular to a motor rotating shaft structure and a method for connecting a motor and a load. The invention relates to a motor rotating shaft structure, which comprises a rotating shaft body and a mandrel, wherein the rotating shaft body is provided with a through central hole along the central axis thereof; the mandrel and the rotating shaft body are coaxially arranged in a central hole of the rotating shaft body; the mandrel is also coaxially butted with the load rotating shaft. The invention relates to a method for connecting a motor and a load, wherein a rotating shaft body is used for rotating; the mandrel is used for transmitting torque; the radial clearance is used for compensating the installation error of the connection of the motor rotating shaft and the load rotating shaft. According to the motor rotating shaft structure and the connecting method of the motor and the load, the rotating motion and the torque are transmitted separately, the compensation of the installation error of the connection of the motor rotating shaft and the load rotating shaft is realized by means of the slender structure characteristic of the mandrel and the radial clearance between the mandrel and the rotating shaft body, the transmission is reliable, and the service life of the connection of the motor rotating shaft and the load rotating shaft is far longer than that of the connection of the coupler.
Description
Technical Field
The invention relates to the technical field of motor transmission, in particular to a motor rotating shaft structure and a method for connecting a motor and a load.
Background
Electric motors are the most widely used power devices in the industrial field for driving various devices and mechanisms. The transmission mode that the motor is coaxially connected with the load is very common, and the coaxial connection of the motor and the load is realized by various types of couplings generally.
Due to factors such as installation error, it is difficult to realize absolute coaxial transmission between the motor and the load. In order to compensate position and angle errors between the motor rotating shaft and the load rotating shaft, various couplings including elastic pins, drum-shaped teeth, serpentine springs, cross shafts and the like are designed and manufactured to solve the problem. However, due to the fact that errors exist between the motor rotating shaft and the load rotating shaft, fretting wear can occur between the coupler and parts with relative motion under severe working conditions of continuous operation, heavy load, alternating load and the like, the coupler is finally damaged and fails along with the extension of operation time, a new coupler or a new accessory needs to be replaced, and hidden dangers are brought to continuous safe operation of equipment. In addition, the coupler is large in size, high in manufacturing cost, and difficult to install and disassemble due to the fact that the coupler is in interference fit with the motor and the load rotating shaft.
Disclosure of Invention
The invention aims to provide a motor rotating shaft structure, which transmits rotary motion through a rotating shaft body, transmits torque through a mandrel, the mandrel is coaxially butted with a load rotating shaft, the rotating shaft body and the mandrel respectively exert respective advantages, and the rotary motion transmission and the torque transmission of a motor are separated and cooperatively work, so that the safety and the reliability of the transmission of the motor are ensured.
In order to achieve the above object, the present invention provides a motor shaft structure, including a shaft body and a spindle, wherein: the rotating shaft body is provided with a through central hole along the central axis thereof, and the rotating shaft body and the motor rotor are assembled into a whole to rotate along with the motor rotor; the spindle and the rotating shaft body are coaxially arranged in a central hole of the rotating shaft body, and the spindle and the rotating shaft body are assembled into a whole and rotate along with the rotating shaft body; the mandrel is also coaxially butted with the load rotating shaft.
Further, the dabber includes first link, middle transmission portion and second link along its length direction in proper order, wherein: the diameters of the first connecting end and the second connecting end are larger than the diameter of the middle transmission part; a radial gap is formed between the side wall of the middle transmission part of the mandrel and the inner wall of the central hole of the rotating shaft body.
Furthermore, the first connecting end and the middle transmission part of the mandrel are both positioned in the central hole; the second connecting end of the mandrel extends out of the central hole and is positioned outside the central hole; the dabber rotates along with the pivot body through first link and pivot body assembly as an organic whole, and the dabber passes through the coaxial butt joint of second link and load pivot.
Further, still include the axle sleeve, wherein: the first end cover of axle sleeve is equipped with the second link of dabber, and the second end cover of axle sleeve is equipped with the load pivot, and the dabber passes through the coaxial butt joint of axle sleeve with the load pivot.
Further, the rotating shaft body and the mandrel are assembled into a whole through interference connection, expansion sleeve connection or key connection; the mandrel and the shaft sleeve are assembled into a whole through interference connection, expansion sleeve connection or key connection; the shaft sleeve and the load rotating shaft are assembled into a whole through interference connection, expansion sleeve connection or key connection.
Further, the diameter of the first connecting end of the mandrel is 1.4 to 1.7 times of the diameter of the middle transmission part of the mandrel; the diameter of the second connecting end of the mandrel is 1.4 to 1.7 times of the diameter of the middle transmission part of the mandrel; the ratio of the length to the diameter of the first connecting end of the mandrel is 0.9 to 1.2; the ratio of the length to the diameter of the second connecting end of the mandrel is 0.9 to 1.2; the ratio of the diameter to the length of the intermediate transmission part of the mandrel is 1:18 to 1: 50.
further, the width of the radial gap is 3-10 mm.
Further, the cover expands includes first bloated compact ring, the bloated compact ring of second, bloated compact cover and a plurality of bolt, wherein: the expansion sleeve is sleeved on the rotating shaft body or the shaft sleeve, a first end of the expansion sleeve forms a first wedge-shaped slope, a second end of the expansion sleeve forms a second wedge-shaped slope, and the large end of the first wedge-shaped slope is opposite to the large end of the second wedge-shaped slope; the first expansion ring is sleeved on the first wedge-shaped slope, and the second expansion ring is sleeved on the second wedge-shaped slope; the first expansion ring and the second expansion ring are connected through the parallel expansion sleeve axis threads of the bolts, and the expansion sleeve expands the rotating shaft body or the shaft sleeve through the screwing-in of the bolts.
The invention discloses a motor rotating shaft structure, which has the following beneficial effects:
1. according to the motor rotating shaft structure, the motor rotating shaft comprises the rotating shaft body and the mandrel, so that the rotating motion is transmitted through the rotating shaft body, the torque is transmitted through the mandrel, the mandrel is in coaxial butt joint with the load rotating shaft, the rotating shaft body and the mandrel respectively exert respective advantages, the rotating motion transmission and the torque transmission of the motor are separated and work cooperatively, and the safety and the reliability of the motor transmission are guaranteed; in addition, the application of a coupler is omitted, the cost is reduced, and the installation is simpler and more convenient.
2. According to the motor rotating shaft structure, the diameters of the first connecting end and the second connecting end of the mandrel are larger than that of the middle transmission part, a radial gap is formed between the side wall of the middle transmission part of the mandrel and the inner wall of the central hole of the rotating shaft body, no relative motion exists between the mandrel and the rotating shaft body, and a larger radial gap exists between the mandrel and the rotating shaft body, so that the mandrel and the rotating shaft body are not contacted and abraded due to installation errors between the motor and a load rotating shaft, namely the potential safety hazard of motor transmission is reduced due to the arrangement of the radial gap; in addition, larger mounting allowable errors are also given to the motor rotating shaft and the load rotating shaft.
3. The motor rotating shaft structure has various connecting modes between the rotating shaft body and the mandrel, between the mandrel and the shaft sleeve and between the shaft sleeve and the load rotating shaft, and is simple and feasible, and in addition, the connection is reliable.
4. The motor rotating shaft structure reasonably designs the size of each shaft end of the mandrel, thereby ensuring that the mandrel reliably transmits torque, and endowing the motor with a larger allowable error value connected with the load rotating shaft, thereby being convenient for installation and meeting the transmission requirement.
5. The motor rotating shaft structure of the invention designs the structure of the expansion sleeve independently, thereby realizing that the expansion sleeve can be sleeved outside the rotating shaft body or on the shaft sleeve to realize the direct expansion connection of the rotating shaft body and the mandrel, the mandrel and the shaft sleeve or the load rotating shaft and the shaft sleeve, and the external installation mode is more convenient to disassemble and assemble.
The invention provides a method for connecting a motor and a load by applying the motor rotating shaft structure, which is characterized by comprising the following steps: the rotating shaft body and the motor rotor are assembled into a whole to rotate along with the motor rotor and used for transmitting the rotating motion of the motor rotating shaft; the spindle and the rotating shaft body are assembled into a whole to rotate along with the rotating shaft body and used for transmitting the torque of the rotating shaft of the motor; the radial clearance formed between the side wall of the middle transmission part and the inner wall of the central hole of the rotating shaft body is used for compensating the installation error of the connection between the rotating shaft of the motor and the load rotating shaft.
Furthermore, the allowable radial error of the connection between the motor mandrel and the load rotating shaft is +/-1.0- +/-2.5 mm, and the allowable angle error is +/-1.0 degrees.
The method for connecting the motor and the load has the following beneficial effects:
1. the connection method of the motor and the load provides a novel connection or transmission mode, rotational motion transmission and torque transmission are separated, and compensation of installation errors of connection of the motor rotating shaft and the load rotating shaft is achieved by means of the slender structure characteristics of the mandrel and the radial clearance between the mandrel and the rotating shaft body, transmission is reliable, and the service life of the connection method is far longer than that of a coupler.
2. The method for connecting the motor and the load has the advantages that the allowable radial error of the connection between the motor mandrel and the load rotating shaft can reach +/-1.0- +/-2.5 mm, the allowable angle error can reach +/-1.0 degrees, the general assembly precision requirement is met, and conditions are created for well adapting to the position and angle errors between the motor rotating shaft and the load rotating shaft in order to realize the connection between the motor and the load rotating shaft.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view (I) of the installation of the motor shaft structure of the present invention;
FIG. 2 is a schematic view of the installation of the motor shaft structure of the present invention (II);
FIG. 3 is a schematic structural view of a spindle of the motor shaft structure of the present invention;
FIG. 4 is a partial enlarged view of portion A of FIG. 2;
in the figure: 1-a rotating shaft body, 2-a mandrel, 21-a first connecting end, 22-an intermediate transmission part, 23-a second connecting end, 3-a load rotating shaft, 4-a shaft sleeve, 5-an expansion sleeve, 51-a first expansion ring, 52-a second expansion ring, 53-an expansion sleeve and 54-a bolt;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, fig. 2, fig. 3, and fig. 4, a rotating shaft structure of a motor according to an embodiment of the present invention includes a rotating shaft body 1 and a spindle 2, wherein: the rotating shaft body 1 is provided with a through central hole along the central axis thereof, and the rotating shaft body 1 and the motor rotor are assembled into a whole to rotate along with the motor rotor; the mandrel 2 and the rotating shaft body 1 are coaxially arranged in a central hole of the rotating shaft body 1, and the mandrel 2 and the rotating shaft body 1 are assembled into a whole to rotate along with the rotating shaft body 1; the mandrel 2 is also coaxially butted with the load rotating shaft 3.
Specifically, the original motor rotating shaft is designed into a split structure and comprises a rotating shaft body 1 and a core shaft 2, the rotating shaft body 1 and a motor rotor are assembled into a whole, and the rotating shaft body 1 is large in outer diameter and good in rigidity and is used for transmitting the rotating motion of the motor; the mandrel 2 is arranged in a central hole of the rotating shaft body 1, the left end of the mandrel 2 is connected and assembled with the inner hole of the rotating shaft body 1 into a whole, the right end of the mandrel 2 extends out of the rotating shaft body 1 to be butted with the load rotating shaft 3, and the mandrel 2 is used for transmitting the torque of the motor by utilizing the large length-diameter ratio of the mandrel 2, so that a novel connection mode is provided, the rotating motion transmission and the torque transmission of the motor are separated, the work division and the cooperation are realized, the respective advantages are exerted, and the transmission of the motor is safer and; in addition, the rotating shaft body 1 and the load rotating shaft 3 can be connected through the shaft sleeve 4 or connected through threads arranged at the end part, so that the application of a coupler is omitted, and the cost is saved. In addition, the technology for processing the through center hole of the motor rotating shaft body 1 is mature, the cost is low, and the rotating shaft body 1 can be directly processed by a thick-wall steel pipe.
Further, as shown in fig. 1 to 4, the mandrel 2 sequentially comprises a first connecting end 21, an intermediate transmission part 22, and a second connecting end 23 along the length direction thereof, wherein: the diameters of the first connecting end 21 and the second connecting end 23 are both larger than the diameter of the middle transmission part 22; a radial clearance L is formed between the side wall of the middle transmission part 22 of the mandrel 2 and the inner wall of the central hole of the rotating shaft body 1.
Specifically, the first connecting end 21 and the middle transmission part 22 of the mandrel 2 are both positioned in the central hole; the second connecting end 23 of the mandrel 2 extends out of the central hole and is positioned outside the central hole; the mandrel 2 is assembled with the rotating shaft body 1 into a whole through the first connecting end 21 and rotates along with the rotating shaft body 1, and the mandrel 2 is coaxially butted with the load rotating shaft 3 through the second connecting end 23. The first connecting end 21 of the mandrel 2 is the left end of the mandrel 2 shown in fig. 1 and 2, and the second connecting end 23 of the mandrel 2 is the right end of the mandrel 2 shown in fig. 1 and 2. Because the first connecting end 21 of the mandrel 2 is positioned in the central hole and connected with the inner hole of the rotating shaft body 1, the second connecting end 23 extends out of the central hole of the rotating shaft body 1, and the diameter of the middle transmission part 22 of the mandrel 2 is smaller than that of the first connecting end 21, the radial gap L is formed between the mandrel 2 and the rotating shaft body 1. Optionally, the width of the radial gap L is 3-10 mm. The mandrel 2 and the rotating shaft body 1 do not move relatively, and a large radial gap L exists between the mandrel 2 and the rotating shaft body 1, so that the mandrel 2 and the rotating shaft body 1 are not contacted and abraded due to installation errors between the motor and the load rotating shaft 3, and potential safety hazards of motor transmission are reduced; in addition, a larger mounting allowance error is given to the motor rotating shaft and the load rotating shaft 3.
More specifically, the diameter of the first connecting end 21 of the mandrel 2 is 1.4 to 1.7 times the diameter of the intermediate transmission part 22 of the mandrel 2; the second connecting end 23 of the spindle 2 has a diameter which is 1.4 to 1.7 times the diameter of the intermediate transmission part 22 of the spindle 2. Preferably, the diameters of the first connecting end 21 and the second connecting end 23 are equal, and the diameters of the first connecting end 21 and the second connecting end 23 are 1.6 times of the diameters of the intermediate transmission part 22. The ratio of the length to the diameter of the first connecting end 21 of the mandrel 2 is 0.9 to 1.2; the ratio of the length to the diameter of the second connecting end 23 of the mandrel 2 is 0.9 to 1.2; the ratio of the diameter to the length of the intermediate transmission portion 22 of the mandrel 2 is 1:18 to 1: 50. the sizes of all shaft ends of the mandrel 2 are reasonably designed, so that the mandrel 2 is ensured to reliably transmit torque, and a larger allowable error value for connecting the motor and the load rotating shaft 3 is given, so that the installation is convenient.
The mandrel 2 is a shaft with a slender middle part and two thickened ends, the flexibility is good, and the middle small-diameter section meets the strength requirement of reliably transmitting the torque of the motor for a long time. For a series of common motors with power of 3-200KW and synchronous rotation speed of 3000-750rpm, the central diameter of the mandrel 2 is 11-63mm, thus meeting the strength requirement. The corresponding motor length is 400-1300mm, and the diameter-to-length ratio of the mandrel 2 is 1:20-1:40, so that the mandrel 2 has good flexibility. One end of the mandrel 2 is fixed (namely, the first connecting end 21 of the mandrel 2 is connected with the inner hole of the rotating shaft body 1), and a small radial force is applied to the other end, so that the mandrel 2 can generate a radial displacement required by the installation error of the motor and the load, and the stress applied to parts such as the mandrel 2, the rotating shaft body 1, the load rotating shaft 3, the bearing and the like is in an allowable range, and the operation reliability of the motor and the load is not influenced. The allowable radial error of the connection between the motor and the load rotating shaft 3 can reach +/-1.0 to +/-2.5 mm, the allowable angle error can reach +/-1.0, and the requirement of general assembly precision is met. In order to realize the connection between the motor and the load rotating shaft 3, conditions are created for well adapting to the position and angle errors between the motor rotating shaft and the load rotating shaft 3.
In the above embodiment of the motor rotating shaft structure of the present invention, the motor rotating shaft structure further includes the shaft sleeve 4, and the coaxial butt joint of the spindle 2 and the load rotating shaft 3 is realized through the shaft sleeve 4. Specifically, the first end of the shaft sleeve 4 is sleeved with the second connecting end 23 of the mandrel 2, the second end of the shaft sleeve 4 is sleeved with the load rotating shaft 3, and then the mandrel 2 and the load rotating shaft 3 are coaxially butted through the shaft sleeve 4.
In particular, in addition, because the diameter of the mandrel 2 is small, the length-diameter ratio is large, under the action of a small radial load, radial displacement of +/-1.0 to +/-2.5 mm can be generated relative to the rotating shaft center of the motor, and the displacement is enough to compensate the installation error between the motor and the load rotating shaft 3, so that large load can not be generated on the load rotating shaft 3 and the connecting shaft sleeve 4, and the fatigue damage can not be generated on the load rotating shaft 3 and the connecting shaft sleeve 4.
Further, the rotating shaft body 1 and the mandrel 2 can be assembled into a whole through interference connection, expansion sleeve connection or key connection; the mandrel 2 and the shaft sleeve 4 can be assembled into a whole through interference connection, expansion sleeve connection or key connection; the shaft sleeve 4 and the load rotating shaft 3 can be assembled into a whole through interference connection, expansion sleeve connection or key connection. The specific connection mode can be determined by those skilled in the art according to the actual situation. For example, as shown in fig. 1, the rotating shaft body 1 is connected with the mandrel 2 through a key, the shaft sleeve 4 is connected with the mandrel 2 through an expansion sleeve 5 in an expansion manner, and the shaft sleeve 4 is connected with the load rotating shaft 3 through a key; for convenience of disassembly and assembly, it is preferable that, as shown in fig. 2, the shaft body 1 and the mandrel 2, the shaft sleeve 4 and the mandrel 2, and the shaft sleeve 4 and the load rotating shaft 3 are all connected by an expansion sleeve 5 in an expanding manner.
In the above-described embodiment of the motor rotating shaft structure of the present invention, a separate structural design is made on the structure of the expansion sleeve 5, and the expansion sleeve 5 includes the first expansion ring 51, the second expansion ring 52, the expansion sleeve 53, and the bolts 54, wherein: the expansion sleeve 53 is sleeved on the rotating shaft body 1 or the shaft sleeve 4, a first end of the expansion sleeve 53 forms a first wedge-shaped slope, a second end of the expansion sleeve 53 forms a second wedge-shaped slope, and the large end of the first wedge-shaped slope is opposite to the large end of the second wedge-shaped slope; the first expansion ring 51 is sleeved on the first wedge-shaped slope, and the second expansion ring 52 is sleeved on the second wedge-shaped slope; the bolts 54 are parallel to the axis of the expansion sleeve 53 and are in threaded through connection with the first expansion ring 51 and the second expansion ring 52, and the expansion sleeve 53 expands the rotating shaft body 1 or the shaft sleeve 4 through screwing in of the bolts 54.
Specifically, as shown in fig. 2, the shaft body 1 and the mandrel 2, the shaft sleeve 4 and the mandrel 2, and the shaft sleeve 4 and the load shaft 3 are all connected in an expanding manner through the separately designed expanding sleeve 5, the expanding degree of the expanding sleeve 5 can be controlled through the screwing depth of the bolt 54, and the adjustment is very convenient. The expansion sleeve 5 is sleeved outside the rotating shaft body 1 or on the shaft sleeve 4 to realize the direct expansion connection of the rotating shaft body 1 and the mandrel 2, the mandrel 2 and the shaft sleeve 4 or the load rotating shaft 3 and the shaft sleeve 4, and the external mounting mode is adopted to be more convenient to disassemble and assemble.
The motor rotating shaft structure adopts a novel motor transmission mode, fully utilizes the characteristic of long axial dimension of a motor, and is characterized in that a small-diameter flexible mandrel 2 is arranged in a motor rotating shaft body 1 and is reliably connected with a load rotating shaft 3. The motor is verified by combining theory and field application, has the advantages of correct theory, simple structure, no easily damaged parts, adaptability to various complex working conditions, realization of standardization, service life of the motor and the like, and is suitable for various motors. Compared with a coupling connection mode, the coupling has good economy; compared with the traditional motor, the diameter of the rotating shaft of the motor with the same specification is not obviously increased, the base number of the motor is not changed, the motor has interchangeability with the traditional motor, and the motor can adopt various installation modes such as a base type, a flange type, a vertical type and a horizontal type.
The invention relates to a method for connecting a motor and a load by applying the motor rotating shaft structure of any embodiment, wherein a rotating shaft body 1 and a motor rotor are assembled into a whole to rotate along with the motor rotor and are used for transmitting the rotating motion of the motor rotating shaft; the core shaft 2 and the rotating shaft body 1 are assembled into a whole to rotate along with the rotating shaft body 1 and used for transmitting the torque of the rotating shaft of the motor; the radial clearance formed between the side wall of the middle transmission part 22 and the inner wall of the central hole of the rotating shaft body 1 is used for compensating the installation error of the connection between the rotating shaft of the motor and the load rotating shaft 3.
The connection method of the motor and the load provided by the invention provides a novel connection or transmission mode, rotational motion transmission and torque transmission are separated, and the compensation of the installation error of the connection of the motor rotating shaft and the load rotating shaft 3 is realized by means of the slender structure characteristic of the mandrel 2 and the radial clearance L between the mandrel 2 and the rotating shaft body 1, the transmission is reliable, and the service life of the connection method is far longer than that of a coupler.
Furthermore, the allowable radial error of the connection between the motor mandrel 2 and the load rotating shaft 3 is +/-1.0- +/-2.5 mm, and the allowable angle error is +/-1.0 degrees.
In the method for connecting the motor and the load, the allowable radial error of the connection between the motor mandrel 2 and the load rotating shaft 3 can reach +/-1.0 to +/-2.5 mm, the allowable angle error can reach +/-1.0 degrees, the general assembly precision requirement is met, and conditions are created for realizing the connection between the motor and the load rotating shaft 3 and well adapting to the position and angle error between the motor rotating shaft and the load rotating shaft 3.
The method for connecting the motor and the load is particularly suitable for severe working conditions of continuous operation, frequent reversing, heavy load, high temperature and the like, does not need maintenance, has no fault, and can realize permanent transmission. The motor coupling can replace the existing coupling technology, has the advantages of superior performance to the coupling and incapability of replacing the coupling, can be developed into a motor transmission replacement technology, and has wide application prospect.
It should be noted that the terms "first", "second", "left" and "right" in the present invention are used for convenience of description and should not be construed as limiting the spirit of the present invention.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (10)
1. The utility model provides a motor pivot structure which characterized in that, includes pivot body and dabber, wherein:
the rotating shaft body is provided with a through central hole along the central axis thereof, and the rotating shaft body and the motor rotor are assembled into a whole to rotate along with the motor rotor;
the mandrel and the rotating shaft body are coaxially arranged in the central hole of the rotating shaft body, and the mandrel and the rotating shaft body are assembled into a whole and rotate along with the rotating shaft body;
the mandrel is also in coaxial butt joint with the load rotating shaft.
2. The electric motor shaft structure according to claim 1, wherein the core shaft includes a first connection end, an intermediate transmission portion, and a second connection end in this order along a length direction thereof, wherein:
the diameters of the first connecting end and the second connecting end are larger than the diameter of the middle transmission part;
and a radial gap is formed between the side wall of the middle transmission part of the mandrel and the inner wall of the central hole of the rotating shaft body.
3. The motor shaft structure according to claim 2, wherein:
the first connecting end and the middle transmission part of the mandrel are both positioned in the central hole;
the second connecting end of the mandrel extends out of the central hole and is positioned outside the central hole;
the mandrel is assembled with the rotating shaft body into a whole through the first connecting end and rotates along with the rotating shaft body, and the mandrel is coaxially butted with the load rotating shaft through the second connecting end.
4. The motor shaft structure according to claim 3, further comprising a bushing, wherein:
the first end of the shaft sleeve is sleeved with the second connecting end of the mandrel, the second end of the shaft sleeve is sleeved with the load rotating shaft, and the mandrel and the load rotating shaft are coaxially butted through the shaft sleeve.
5. The motor shaft structure according to claim 4, wherein:
the rotating shaft body and the mandrel are assembled into a whole through interference connection, expansion sleeve connection or key connection;
the mandrel and the shaft sleeve are assembled into a whole through interference connection, expansion sleeve connection or key connection;
the shaft sleeve and the load rotating shaft are connected into a whole through interference connection, expansion sleeve connection or key connection.
6. The motor shaft structure according to claim 2, wherein:
the diameter of the first connecting end of the mandrel is 1.4 to 1.7 times of the diameter of the middle transmission part of the mandrel;
the diameter of the second connecting end of the mandrel is 1.4 to 1.7 times of the diameter of the middle transmission part of the mandrel;
the ratio of the length to the diameter of the first connection end of the mandrel is 0.9 to 1.2;
the ratio of the length to the diameter of the second connecting end of the mandrel is 0.9 to 1.2;
the ratio of the diameter to the length of the intermediate transmission portion of the mandrel is 1:18 to 1: 50.
7. an electric motor shaft structure according to any one of claims 2 to 6, wherein the width of the radial gap is 3 to 10 mm.
8. The electric motor shaft structure according to claim 5, wherein the expansion sleeve includes a first expansion ring, a second expansion ring, an expansion sleeve, and a plurality of bolts, wherein:
the expansion sleeve is sleeved on the rotating shaft body or the shaft sleeve, a first end of the expansion sleeve forms a first wedge-shaped slope, a second end of the expansion sleeve forms a second wedge-shaped slope, and the large end of the first wedge-shaped slope is opposite to the large end of the second wedge-shaped slope;
the first expansion ring is sleeved on the first wedge-shaped slope, and the second expansion ring is sleeved on the second wedge-shaped slope;
the bolts are parallel to the axis threads of the expansion sleeve and are in through connection with the first expansion ring and the second expansion ring, and the expansion sleeve expands through screwing in of the bolts to tightly stretch the rotating shaft body or the shaft sleeve.
9. A method of connecting a motor to a load using the motor shaft structure of any one of claims 1 to 8, characterized in that:
the rotating shaft body and the motor rotor are assembled into a whole to rotate along with the motor rotor and used for transmitting the rotating motion of the motor rotating shaft;
the spindle and the rotating shaft body are assembled into a whole to rotate along with the rotating shaft body and used for transmitting the torque of the rotating shaft of the motor;
the radial clearance formed between the side wall of the middle transmission part and the inner wall of the central hole of the rotating shaft body is used for compensating the installation error of the connection between the rotating shaft of the motor and the load rotating shaft.
10. A method of connecting a motor to a load as claimed in claim 9, wherein the permissible radial tolerance of the connection of the motor spindle to the load spindle is ± 1.0 to ± 2.5mm, and the permissible angular tolerance is ± 1.0 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911024532.8A CN110994878A (en) | 2019-10-25 | 2019-10-25 | Motor rotating shaft structure and method for connecting motor and load |
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| CN201911024532.8A CN110994878A (en) | 2019-10-25 | 2019-10-25 | Motor rotating shaft structure and method for connecting motor and load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116094239A (en) * | 2023-04-07 | 2023-05-09 | 德瑞精工（深圳）有限公司 | Low-jumping slender motor and processing method thereof |
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2019
- 2019-10-25 CN CN201911024532.8A patent/CN110994878A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116094239A (en) * | 2023-04-07 | 2023-05-09 | 德瑞精工（深圳）有限公司 | Low-jumping slender motor and processing method thereof |
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Effective date of registration: 20200923 Address after: No.10 Guoan Road, comprehensive bonded zone, Caofeidian Industrial Zone, Tangshan City, Hebei Province Applicant after: TANGSHAN JIDONG PETROLEUM MACHINERY Co.,Ltd. Applicant after: PetroChina Co.,Ltd. Address before: 063200 No. 261, New Town Street, Tang Hai Town, Caofeidian District, Tangshan City, Hebei Applicant before: TANGSHAN JIDONG PETROLEUM MACHINERY Co.,Ltd. |
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