CN116667579A - Motor positioning frame connecting mechanism and motor - Google Patents

Abstract

The invention discloses a motor positioning frame connecting mechanism and a motor, wherein the connecting mechanism comprises a machine shell, a first hole section for accommodating a stator is arranged in the machine shell, and the connecting mechanism comprises the following components: the device also comprises a positioning ring and an expanding assembly; a second hole section is formed at one end of the shell; the second bore section has a larger diameter than the first bore section; a limiting surface is formed between the first hole section and the second hole section; the positioning ring is arranged in the second hole section, one end face of the positioning ring is abutted against the limiting surface, and an annular mounting space is formed between the positioning ring and the wall of the second hole section; the expansion assembly is installed in the installation space and is used for being expanded between the shell and the positioning ring. The invention can avoid the influence of processing errors on the fastening degree between the locating rack and the shell.

Description

Motor positioning frame connecting mechanism and motor

Technical Field

The invention relates to the technical field of motors, in particular to a motor positioning frame connecting mechanism and a motor.

Background

The servo motor has the characteristics of high positioning precision, stable running rotating speed, strong overload capacity and the like, and is widely applied to industries with higher requirements on working reliability and running stability, such as machine tools, printing equipment, robots, automatic production lines, AGVs, electric forklifts and the like. In order to improve the motor performance, as much stator space as possible is required, so that the motor casing is thinned, so that the casing ends cannot be screwed. The shell wall open-pore connection affects the beauty and has poor fastening degree. The connection between the chassis and the end caps typically requires a spacer as an intermediate connector.

The positioning frame of the existing servo motor is generally connected with the casing in an interference mode to fasten the casing and the positioning frame, and then the end cover is fastened with the positioning frame through screws to fasten the end cover part and the casing part.

The disadvantage of the prior art is that the influence of machining errors on the degree of tightening is unavoidable. The interference between the casing and the locating rack is difficult to ensure in reasonable range, and whether the connection between the casing and the locating rack is firm or not can not be judged, sometimes the installation end cover can enable the locating rack to slip under the tensile force, and the safety of the whole motor structure can not be guaranteed. In addition, the existing structure is difficult to disassemble. The thread compound added for increasing the connection firmness can only play an auxiliary role, and can also lose the role when the interference connection fails.

In summary, how to avoid the influence of the machining error on the fastening degree between the positioning frame and the housing is one of the important issues to be solved in the art.

Disclosure of Invention

The invention aims to provide a motor positioning frame connecting mechanism which solves the defects in the prior art and can avoid the influence of processing errors on the fastening degree between a positioning frame and a machine shell.

The invention provides a motor positioning frame connecting mechanism, which comprises a machine shell, wherein a first hole section for accommodating a stator is arranged in the machine shell, and the first hole section comprises: the device also comprises a positioning ring and an expanding assembly;

a second hole section is formed at one end of the shell; the second bore section has a larger diameter than the first bore section; a limiting surface is formed between the first hole section and the second hole section;

the positioning ring is arranged in the second hole section, one end face of the positioning ring is abutted against the limiting surface, and an annular mounting space is formed between the positioning ring and the wall of the second hole section;

the expansion assembly is installed in the installation space and is used for being expanded between the shell and the positioning ring.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the positioning ring comprises a first ring body and a second ring body;

the outer diameter of the first ring body is larger than that of the second ring body;

the end face, away from the second ring body, of the first ring body abuts against the limiting surface;

the first ring body is in transition fit with the first hole section;

the expansion assembly is located between the second ring body and a wall of the second bore section.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the expanding component comprises an inner sleeve and an outer sleeve;

the inner sleeve is sleeved on the second ring body and is in clearance fit with the second ring body;

the outer periphery of the inner sleeve is provided with a first expansion surface, and the diameter of the first expansion surface gradually becomes smaller from one end to the other end along the axial direction of the inner sleeve;

the inner wall of the outer sleeve is provided with a second expansion surface, and the diameter of the second expansion surface gradually becomes smaller from one end to the other end along the axial direction of the outer sleeve; the first expansion surface is adapted to the second expansion surface to expand in a radial direction between the second ring body and the wall of the second bore section.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the end of the inner sleeve with larger outer diameter is propped against the end face of the first ring body;

the end of the outer sleeve with larger inner diameter is inserted between the inner sleeve and the wall of the second hole section.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the inner sleeve and the outer sleeve are circular ring cones, and the cone apex angle corresponding to the first expansion surface and the cone apex angle corresponding to the second expansion surface are 12-16 degrees.

The motor positioning frame connecting mechanism as described above, wherein, optionally: one end of the outer sleeve, which is far away from the end with larger inner diameter, is provided with a compression ring; the compression ring is used for bearing axial pressure so as to drive the outer sleeve to move between the inner sleeve and the wall of the second hole section, and the positioning ring and the shell are expanded in the radial direction.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the positioning ring is provided with first expansion holes, and the compression ring is provided with second expansion holes which are in one-to-one correspondence with the first expansion holes; the first expansion hole is a threaded hole, and the expansion screw penetrates through the second expansion hole to be in threaded connection with the corresponding first expansion hole.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the device also comprises an end cover and a fastening bolt;

the positioning ring is provided with a plurality of fastening holes which are uniformly distributed along the central line around the positioning ring; the fastening hole is a threaded hole;

the end cover is provided with a plurality of mounting holes, a plurality of mounting holes are in one-to-one correspondence with the fastening holes, and the fastening bolts penetrate through the mounting holes to be in threaded connection with the corresponding fastening holes.

The motor positioning frame connecting mechanism as described above, wherein, optionally: the dismounting bolt is also included;

the compression ring is provided with a disassembly hole, and the disassembly hole is a threaded hole;

the dismounting bolt is used for being in threaded connection with the dismounting hole when being dismounted, and the end part of the dismounting bolt is abutted to the positioning ring so as to dismount the outer sleeve.

The invention also provides a motor, which comprises the motor positioning frame connecting mechanism.

Compared with the prior art, the invention has the advantages that the expansion assembly is arranged between the shell and the positioning ring, the expansion assembly is utilized to expand in the radial direction, the pressure between the expansion assembly and the shell and between the positioning ring and the expansion assembly can be changed, and the friction between the shell and the expansion assembly and the friction between the positioning ring and the expansion assembly can be changed through the adjustment of the pressure. That is, the fastening is achieved by friction. By means of the method, the requirement on manufacturing precision is reduced, and the influence of machining errors on the fastening degree between the locating rack and the machine shell can be avoided.

Drawings

Fig. 1 is a schematic structural view of a motor positioning frame connecting mechanism according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of a partially enlarged structure of FIG. 1;

fig. 3 is a schematic end-face structure of a motor positioning frame connecting mechanism according to embodiment 1 of the present invention;

FIG. 4 is a cross-sectional view of the motor spacer attachment mechanism of embodiment 1 of the present invention when disassembled;

fig. 5 is a schematic diagram of an end face structure of a motor positioning frame connecting mechanism according to embodiment 1 of the present invention when the motor positioning frame connecting mechanism is detached;

FIG. 6 is a graph of the applied pressure obtained by simulation of a motor of a certain type;

FIG. 7 is a graph of the simulated expansion friction of a motor model;

FIG. 8 is a graph of simulated disassembly force for a model motor;

FIG. 9 is a graph of simulated applied pressure for a model motor housing single side error of 0.02 mm;

FIG. 10 is a simulated tension friction curve for a motor housing of a certain type with a single side error of 0.02 mm;

FIG. 11 is a graph of simulated disassembly force for a motor housing of a certain type with a single edge error of 0.02 mm.

Reference numerals illustrate:

the device comprises a 1-shell, a 2-positioning ring, a 3-expansion assembly, a 4-expansion screw, a 5-end cover, a 6-fastening bolt, a 7-dismounting bolt and an 8-rotating shaft;

11-a first hole section, 12-a second hole section, 13-a limiting surface and 14-an installation space;

21-a first ring, 22-a second ring;

31-inner sleeve, 32-outer sleeve, 33-first expansion surface, 34-second expansion surface, 35-compression ring, 36-second expansion hole and 37-disassembly hole;

51-mounting holes.

Detailed Description

The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

The problem of the influence of unavoidable machining errors on the fastening degree, which is proposed in the background art, is mainly caused by the fact that errors are difficult to avoid in production, interference cannot be kept in a reasonable range, and the safety of the whole structure of the motor is difficult to guarantee. On the other hand, the thread compound added for increasing the connection firmness in the prior art can only play an auxiliary role, and can also lose the role when the interference connection fails.

In order to solve the above-described problems, the present invention proposes the following embodiments.

Example 1

Referring to fig. 1 to 3, the present embodiment provides a motor positioning frame connection mechanism, which includes a housing 1, wherein a first hole section 11 for accommodating a stator is provided in the housing 1, and the first hole section comprises: also comprises a positioning ring 2 and an expanding assembly 3. Specifically, the casing 1 refers to a motor casing, and the positioning ring 2 is used for positioning the expansion assembly 3, so that the expansion assembly 3 is installed between the positioning ring 2 and the casing 1, and the expansion assembly 3 is expanded between the positioning ring 2 and the casing 1.

Specifically, referring to fig. 1, a second hole section 12 is provided at one end of the casing 1; the second hole section 12 has a larger diameter than the first hole section 11; namely, a stepped hole is formed between the second hole section 12 and the first hole section 11, and a limiting surface 13 is formed between the first hole section 11 and the second hole section 12; the limiting surface 13 is the step surface of the step hole. The limiting surface 13 is used for axially limiting the positioning ring 2.

The positioning ring 2 is arranged in the second hole section 12, one end face of the positioning ring is abutted against the limiting surface 13, and an annular mounting space 14 is formed between the positioning ring and the wall of the second hole section 12; in particular, the outer diameter of the positioning ring 2 is greater than the first hole section 12, so that the end face of the positioning ring 2 can rest against the limiting surface 13.

The expansion assembly 3 is installed in the installation space 14, and the expansion assembly 3 is used for expanding between the casing 1 and the positioning ring 2. That is, the expansion assembly 3 is pressed at both sides in the radial direction and the inside and the outside by the increase of the size of the expansion assembly 3 in the radial direction, thereby realizing the fixed connection between the casing 1 and the positioning ring 2. When the same pressure is applied, the thickness variation increment of the expansion assembly 3 in the radial direction is increased, and the fastening friction force is not changed greatly, so that the influence of the machining error on the connection fastening degree is avoided from being unable to evaluate.

Referring to fig. 2, in order to facilitate installation of the expansion assembly 3, a suitable installation space 14 needs to be formed between the positioning ring 2 and the housing 1, and this embodiment is modified as follows: the positioning ring 2 comprises a first ring body 21 and a second ring body 22. Specifically, the center line of the first ring body 21 and the center line of the second ring body 22 are on the same straight line.

The outer diameter of the first ring body 21 is larger than the outer diameter of the second ring body 22; in particular, the first ring body 21 is in transition fit with the first hole section 11; the main function of the positioning ring 2 is to position and attach the end cap 5.

Specifically, the end surface of the first ring body 21 away from the second ring body 22 abuts against the limiting surface 13. Namely, the retainer ring 2 is restrained by the restraining surface 13.

The expansion assembly 3 is located between the second ring body 22 and the wall of the second bore section 12. That is, the expansion assembly 3 is installed in the installation space 14.

In particular, in order to achieve the expansion of the expansion assembly 3 in the radial direction, this embodiment is further improved: specifically, the expansion assembly 3 includes an inner sleeve 31 and an outer sleeve 32. The inner sleeve 31 and the outer sleeve 32 are used for realizing the expansion of the expansion assembly 3 in the radial direction through the mutual matching of inclined planes so as to increase the friction force and ensure the fastening connection between the positioning ring 2 and the casing 1.

In a specific implementation, the inner sleeve 31 is sleeved on the second ring 22 and is in clearance fit with the second ring 22; the single-side gap is preferably 0.02 mm, but it is also possible to set the gap to 0.01 to 0.03 mm.

The outer circumference of the inner sleeve 31 is provided with a first expansion surface 33, and the diameter of the first expansion surface 33 gradually decreases from one end to the other end along the axial direction of the inner sleeve 31. The inner wall of the outer sleeve 32 is provided with a second expansion surface 34, and the diameter of the second expansion surface 34 gradually decreases from one end to the other end along the axial direction of the outer sleeve 32; the first expansion surface 33 is adapted to the second expansion surface 34 in order to expand in the radial direction between the second ring body 22 and the wall of the second bore section 12.

So set up, when the great one end of overcoat 32 internal diameter inserts in the space between endotheca 31 and the casing 1, first inflation face 33 cooperates with second inflation face 34, inserts the length between endotheca 31 and the casing 1 through adjusting overcoat 32, adjusts the inflation degree of inflation subassembly 3, and then changes the radial pressure between inflation subassembly 3 and casing 1, the holding ring 2, through the change of pressure, makes corresponding frictional force also take place the improvement, and then changes the fastening degree.

In a specific implementation, the end of the inner sleeve 31 with the larger outer diameter is abutted against the end face of the first ring body 21; that is, the size of the gap between the inner sleeve 31 and the casing 1 in the radial direction becomes larger in the direction away from the first ring body 21 so as to facilitate the insertion of the outer sleeve 32 into the gap. Specifically, the end of the outer sleeve 32 having the larger inner diameter is interposed between the inner sleeve 31 and the wall of the second bore section 12.

In a specific implementation, in order to achieve the expansion effect, the inner sleeve 31 and the outer sleeve 32 are both circular cones, in other words, both ends of the outer sleeve 32 are circular rings; and, the cone apex angle corresponding to the first expansion surface 33 and the cone apex angle corresponding to the second expansion surface 34 are 12 to 16 degrees. That is, the included angle between the bus of the first expansion surface 33 and the corresponding center line and the included angle between the bus of the second expansion surface 34 and the corresponding center line are all 6 to 8 degrees, wherein 7 degrees are the best, and the included angle is set to 7 degrees, so that friction self-locking can be realized. That is, after the outer sleeve 32 is pressed by the press, the relative movement between the inner sleeve 31 and the outer sleeve 32 is prevented by friction self-locking.

Further, an outer jacket 32 is pressed between the inner jacket 31 and the housing 1 as needed for convenience. Specifically, the end of the outer sleeve 32 far away from the larger inner diameter is provided with a compression ring 35; the compression ring 35 is adapted to bear an axial pressure to drive the outer sleeve 32 such that the outer sleeve 32 is moved between the inner sleeve 31 and the wall of the second bore section 12 and radially expands the positioning ring 2 and the housing 1. The provision of the clamp ring 35, in addition to the above-described function, serves to facilitate fixing the relative positions of the inner sleeve 31 and the outer sleeve 32 so as to keep the degree of tightening unchanged, and to provide the dismounting bolt 7 so as to facilitate the dismounting.

In a specific implementation, in order to keep the fastening degree between the inner sleeve 31 and the outer sleeve 32 unchanged, the positioning ring 2 is provided with a first expansion hole, and the compression ring 35 is provided with a second expansion hole 36 corresponding to the first expansion hole one by one; the first expansion hole is a threaded hole, and the expansion screw 4 passes through the second expansion hole 36 to be in threaded connection with the corresponding first expansion hole. During the installation process, the expansion screw 4 keeps the fastening degree between the inner sleeve 31 and the outer sleeve 32 unchanged.

Referring to fig. 1, 3 and 5, in the embodiment, the device further comprises an end cover 5 and a fastening bolt 6; the end cover 5 is fixedly connected with the positioning ring 2 through a fastening bolt 6. The positioning ring 2 is provided with a plurality of fastening holes 23, and the fastening holes 23 are uniformly distributed along the central line around the positioning ring 2; the fastening hole 23 is a threaded hole. In particular embodiments, the fastening holes 23 are kidney-shaped holes in order to ensure easy hole alignment.

Specifically, the end cover 5 is provided with a plurality of mounting holes 51, the plurality of mounting holes 51 are in one-to-one correspondence with the fastening holes 23, and the fastening bolts 6 penetrate through the mounting holes 51 and are in threaded connection with the corresponding fastening holes 23. In one implementation, the mounting holes 51 and the fastening holes 23 are four in number and are evenly distributed around the center line of the end cap 5.

In the specific implementation, referring to fig. 4 and 5, for easy disassembly, the disassembly bolt 7 is further included; the compression ring 35 is provided with a disassembly hole 37, and the disassembly hole 37 is a threaded hole; the dismounting bolt 7 is used for being in threaded connection with the dismounting hole 37 during dismounting, and the end part of the dismounting bolt 7 is abutted against the positioning ring 2 so as to dismount the outer sleeve 32.

Through the above, the motor positioning frame connecting mechanism provided by the embodiment can avoid the influence of processing errors on the fastening degree between the positioning frame and the casing. Meanwhile, the fastening degree can be increased according to the requirement, and in addition, the disassembly is convenient.

The motor positioning frame connecting mechanism is installed through the following steps:

s1, mounting a positioning ring 2 on a machine shell 1;

s2, sleeving the inner sleeve 31 on the positioning ring 2;

s3, pressing the sleeve into the sleeve by a press, and controlling the friction force generated by expansion by adjusting the pressing force;

s4, tightening the expansion screw to enable the inner sleeve 31 and the outer sleeve 32 to be kept relatively fixed;

s5, installing an end cover.

The motor positioning frame connecting mechanism is disassembled through the following steps:

s01, detaching the lower end cover 6 and the expansion screw 4;

s02, screwing in the dismounting bolt 7, so that the end part of the dismounting bolt 7 is abutted against the positioning ring 2; in specific implementation, the dismounting bolts 7 are rotated at small angles in turn until the jacket is ejected.

Referring to fig. 6 to 8, in a motor of a certain type, 1908N pressure is applied and the jacket is pressed in by 0.25mm through simulation software simulation by the structure described above. The tightening friction is 1651N. The maximum removal force is 2228N.

Referring to fig. 9 to 11, in a motor of a certain type, through simulation software, when the single side of the casing has an error of +0.02 mm, the jacket is pressed by the pressing force 1884N by 0.35mm. The tightening friction is 1724N. The maximum removal force was 1960N.

Example 2

The present embodiment is a further improvement on the basis of embodiment 1, and the same points are not described in detail, and only the differences are described below.

The difference from embodiment 1 is that the inner sheath 31 and the outer sheath 32 may be used in reverse. That is, the end of the outer sleeve 32 having the smaller inner diameter is abutted against the positioning ring 2, and the end of the inner sleeve 31 having the smaller outer diameter is inserted between the outer sleeve 32 and the positioning ring 2.

Further, a clamp ring 35 is attached to the end of the inner sleeve 31 having a larger outer diameter.

In other words, unlike embodiment 1 in which the outer sleeve 32 is pressed between the inner sleeve 31 and the casing 1, in this embodiment, the inner sleeve 31 is pressed between the outer sleeve 32 and the retainer ring.

With the above differences, other structures are also adapted, which can be realized by the person skilled in the art and are not repeated here.

Example 3

The present embodiment provides a motor, which includes the motor positioning frame connecting mechanism described in embodiment 1 or embodiment 2.

The rotary machine further comprises a rotary shaft 8, one end of the rotary shaft 8 is connected with the end cover 5 through a bearing, and the other end of the rotary shaft 8 is connected with one end, far away from the end cover, of the shell 1 through a bearing.

Through the embodiments 1, 2 and 3, the invention realizes the safe and reliable positioning frame connecting mechanism, is convenient to disassemble and is suitable for processing errors, and has the advantages of small volume, light weight and compact structure.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (10)

1. The utility model provides a motor locating rack coupling mechanism, includes casing (1), establish in casing (1) and be used for holding first hole section (11) of stator, its characterized in that: the device also comprises a positioning ring (2) and an expanding assembly (3);

one end of the shell (1) is provided with a second hole section (12); the diameter of the second hole section (12) is larger than that of the first hole section (11); a limiting surface (13) is formed between the first hole section (11) and the second hole section (12);

the positioning ring (2) is arranged in the second hole section (12), one end face of the positioning ring is abutted against the limiting surface (13), and an annular mounting space (14) is formed between the positioning ring and the wall of the second hole section (12);

the expansion assembly (3) is arranged in the installation space (14), and the expansion assembly (3) is used for expanding between the shell (1) and the positioning ring (2).

2. The motor positioning frame connection mechanism according to claim 1, wherein: the positioning ring (2) comprises a first ring body (21) and a second ring body (22);

the outer diameter of the first ring body (21) is larger than the outer diameter of the second ring body (22);

the end face, far away from the second ring body (22), of the first ring body (21) abuts against the limiting surface (13);

the first ring body (21) is in transition fit with the first hole section (11);

the expansion assembly (3) is located between the second ring body (22) and the wall of the second bore section (12).

3. The motor positioning frame connection mechanism according to claim 2, wherein: the expanding assembly (3) comprises an inner sleeve (31) and an outer sleeve (32);

the inner sleeve (31) is sleeved on the second ring body (22) and is in clearance fit with the second ring body (22);

the outer periphery of the inner sleeve (31) is provided with a first expansion surface (33), and the diameter of the first expansion surface (33) gradually decreases from one end to the other end along the axial direction of the inner sleeve (31);

the inner wall of the outer sleeve (32) is provided with a second expansion surface (34), and the diameter of the second expansion surface (34) gradually decreases from one end to the other end along the axial direction of the outer sleeve (32); the first expansion surface (33) is adapted to the second expansion surface (34) for expanding in a radial direction between the second ring body (22) and the wall of the second bore section (12).

4. A motor positioning frame connection mechanism according to claim 3, wherein: one end of the inner sleeve (31) with larger outer diameter is abutted against the end face of the first ring body (21);

the end of the outer sleeve (32) with larger inner diameter is inserted between the inner sleeve (31) and the wall of the second hole section (12).

5. The motor positioning frame connection mechanism according to claim 4, wherein: the inner sleeve (31) and the outer sleeve (32) are circular ring cones, and the cone apex angle corresponding to the first expansion surface (33) and the cone apex angle corresponding to the second expansion surface (34) are 12-16 degrees.

6. The motor positioning frame connection mechanism according to claim 5, wherein: one end of the outer sleeve (32) far away from the larger inner diameter of the outer sleeve is provided with a compression ring (35); the compression ring (35) is used for bearing axial pressure to drive the outer sleeve (32), so that the outer sleeve (32) moves between the inner sleeve (31) and the wall of the second hole section (12), and the positioning ring (2) and the machine shell (1) are expanded in the radial direction.

7. The motor positioning frame connection mechanism according to claim 6, wherein: the positioning ring (2) is provided with first expansion holes, and the compression ring (35) is provided with second expansion holes (36) which are in one-to-one correspondence with the first expansion holes; the first expansion hole is a threaded hole, and the expansion screw (4) penetrates through the second expansion hole (36) to be in threaded connection with the corresponding first expansion hole.

8. The motor positioning frame connection mechanism according to any one of claims 1 to 6, wherein: the device also comprises an end cover (5) and a fastening bolt (6);

the positioning ring (2) is provided with a plurality of fastening holes (23), and the fastening holes (23) are uniformly distributed along the central line around the positioning ring (2); the fastening hole (23) is a threaded hole;

the end cover (5) is provided with a plurality of mounting holes (51), the mounting holes (51) are in one-to-one correspondence with the fastening holes (23), and the fastening bolts (6) penetrate through the mounting holes (51) to be in threaded connection with the corresponding fastening holes (23).

9. The motor spacer connection of claim 6 or 7, wherein: the device also comprises a disassembling bolt (7);

the compression ring (35) is provided with a disassembly hole (37), and the disassembly hole is a threaded hole;

the dismounting bolt (7) is used for being in threaded connection with the dismounting hole when being dismounted, and the end part of the dismounting bolt (7) is abutted to the positioning ring (2) so as to dismount the outer sleeve (32).

10. An electric motor comprising a motor spacer attachment mechanism as claimed in any one of claims 1 to 9.