CN112701843B - Bearing compresses tightly subassembly and includes its motor - Google Patents

Abstract

The invention provides a bearing pressing assembly and a motor comprising the same. A bearing compression assembly comprising: the axial first end surface of the outer ring compression ring forms an outer ring abutting surface which is used for abutting against the outer ring of the bearing, and the axial second end surface of the outer ring compression ring forms an outer ring pressure-bearing surface; the outer ring pressing plate is used for being fixed on the bearing seat and providing pressing force for the outer ring pressing ring, an outer ring pressing surface is formed on the outer ring pressing plate, the outer ring pressing surface is in contact with the outer ring pressure bearing surface and provides pressure for the outer ring pressure bearing surface, and the outer ring pressing surface is in surface line contact with the outer ring pressing surface. The invention can improve the reliability of bearing compression, thereby improving the running stability of the bearing and avoiding abnormal sound during running.

Description

Bearing compresses tightly subassembly and includes its motor

Technical Field

The invention relates to the technical field of motors, in particular to a bearing pressing assembly and a motor comprising the same.

Background

The bearing plays the effect of supporting the motor rotating part in the motor, and the normal steady operation of bearing guarantees the even running of motor. The installation precision and the installation process of the bearing influence the service life and the running stability of the bearing. The bearing location of the existing motor is generally that a shaft shoulder and a retaining ring for a shaft locate the inner ring of the bearing, and a wave pad and a bearing pressure plate locate the outer ring of the bearing.

The existing bearing pressing plate is generally of a plate-shaped pressing structure, one side of the bearing pressing plate is in contact with a bearing outer ring and presses a bearing tightly, but the plate-shaped pressing plate has an overturning force on the bearing outer ring after being installed and inclined, the bearing outer ring is inclined along with the pressing plate under the action of the overturning force, so that the bearing outer ring is installed incorrectly to generate shaft noise, the problem that pressing force of the bearing outer ring is not uniformly pressed to incline is caused, motor shaft noise and vibration are caused, and the problems that a motor is not stable in operation, the bearing is high in operation temperature, short in service life and the like are caused.

Disclosure of Invention

In view of this, the present invention provides a bearing pressing assembly and a motor including the same, which are at least used for solving the technical problem of unstable bearing fixation in the prior art, and specifically:

the invention provides a bearing hold down assembly comprising:

the axial first end surface of the outer ring compression ring forms an outer ring abutting surface which is used for abutting against the outer ring of the bearing, and the axial second end surface of the outer ring compression ring forms an outer ring pressure-bearing surface;

the outer ring pressing plate is used for being fixed on the bearing seat and providing pressing force for the outer ring pressing ring, an outer ring pressing surface is formed on the outer ring pressing plate and is in contact with the outer ring pressing surface and provides pressure for the outer ring pressing surface,

the outer ring abutting surface and the outer ring pressing surface are in surface line contact.

Further optionally, the outer ring pressure bearing surface faces the oblique outer side of the outer ring pressure ring, the outer ring pressure bearing surface is a part of a spherical surface, and the spherical center of the spherical surface where the outer ring pressure bearing surface is located on the axis of the outer ring pressure ring.

Further optionally, a radial dimension of the spherical surface is 1.5-2 times an outer diameter dimension of the outer ring.

Further optionally, the outer ring pressing surface is formed on a radial inner side of the outer ring pressing plate toward an oblique outer side of the outer ring pressing plate, the outer ring pressing surface is configured as an annular inclined surface or an annular raised arc surface, and the outer ring pressing surface form the surface line contact.

Further optionally, the radius of curvature of the outer ring pressing surface is larger than the radius of the spherical surface on which the outer ring bearing surface is located.

Further optionally, a plurality of fixing holes are formed in the outer ring pressure plate along the circumferential direction of the outer ring pressure plate, and are used for being matched with a connecting piece to fix the outer ring pressure plate to the bearing seat.

Further optionally, the method further includes:

the inner ring compression ring is provided with an inner ring abutting surface at an axial first end surface and is used for abutting against the inner ring of the bearing, and an inner ring pressure-bearing surface is formed at an axial second end surface;

the inner ring pressing plate comprises an inner ring pressing surface, the inner ring pressing surface is contacted with the inner ring bearing surface and provides pressure for the inner ring bearing surface, the inner ring pressing plate is abutted against the shaft shoulder of the rotating shaft,

the inner ring abutting surface and the inner ring pressing surface are in surface line contact.

Further optionally, the inner ring pressure bearing surface faces the inner side of the inner ring pressure ring in the inclined direction, the inner ring pressure bearing surface is a part of a spherical surface, and the spherical center of the spherical surface where the inner ring pressure bearing surface is located on the axis of the inner ring pressure ring.

Further optionally, a radial dimension of the spherical surface is 1.5-2 times an outer diameter dimension of the inner race.

Further optionally, the inner ring pressing surface is formed by an end surface of the inner ring pressing plate, the inner ring pressing surface is configured as an annular inclined surface or an annular raised arc surface, and the inner ring pressing surface form surface line contact.

Further optionally, a radius of curvature of the inner ring pressing surface is larger than a radius of a spherical surface on which the inner ring bearing surface is located.

In a second aspect, the invention provides an electric machine comprising the above-mentioned bearing pressing assembly,

the outer ring pressing plate is fixed on the bearing seat through a connecting piece and tightly presses the outer ring pressing ring on the outer ring of the bearing;

the inner ring pressing plate is abutted against a shaft shoulder of the motor spindle and tightly presses the inner ring pressing plate through the shaft shoulder, so that the inner ring pressing ring is tightly pressed on an inner ring of the bearing.

The bearing pressing assembly is contacted by adopting the upper threads, so that when the pressing assembly slightly deviates, the pressing force can be ensured to be applied along the axial direction all the time, the problem that the locking force is deflected due to the uneven pressing of the bearing can be avoided, the running vibration and noise of the motor bearing are reduced, the motor shaft noise is avoided, the running stability of the motor is improved, and the service life of the motor is prolonged. Moreover, the structure is simple and convenient to mount, the technical requirement on mounting is not high, and the motor shaft noise caused by uneven bearing locking force and deflection of the locking force due to manual mounting is avoided, so that the service life of the motor is influenced; the motor bearing is ensured to run stably and reliably, and the vibration and noise of the motor are reduced.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic view showing an assembled state of a bearing pressing assembly according to an embodiment of the present invention (only a pressing outer ring);

FIG. 2 is a schematic view showing an assembled state of a bearing pressing assembly according to an embodiment of the present invention (pressing an outer ring and an inner ring at the same time);

FIG. 3 is a diagram illustrating an analysis of the force applied to the outer ring pressing plate and the outer ring pressing ring in cooperation according to an embodiment of the present invention;

FIG. 4 shows an outer ring pressure plate and an outer ring pressure ring fit stress analysis diagram (outer ring pressure plate offset) according to an embodiment of the present invention;

FIG. 5 shows an analysis diagram of the fit stress of the outer ring pressing plate and the outer ring pressing ring according to the embodiment of the invention;

FIG. 6 shows an analysis graph of the fit stress of the outer ring pressing plate and the outer ring pressing ring (outer ring pressing plate offset) according to the embodiment of the invention;

FIG. 7 shows an analysis diagram of the matching stress of the three outer ring pressing plates and the outer ring pressing ring in the embodiment of the invention;

FIG. 8 shows an analysis chart of the stress of the three outer ring pressing plates and the outer ring pressing ring in cooperation (the outer ring pressing plates are offset) in the embodiment of the invention;

FIG. 9 shows an analysis diagram of the fit stress of the four outer ring pressing plates and the outer ring pressing ring according to the embodiment of the invention;

FIG. 10 shows an analysis graph of the force applied to the fit between the four outer ring pressing plates and the outer ring pressing ring (outer ring pressing plate offset) according to the embodiment of the present invention.

In the figure:

1. a bearing seat; 2. a main shaft; 11. an outer ring pressing plate; 21. an outer ring compression ring; 41. a bearing outer race; 12. an inner ring pressing plate; 22. an inner ring compression ring; 42. a bearing inner race; 30. and (4) bolts.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or system comprising the element.

The bearing pressing assembly is used for pressing the inner ring and the outer ring of the bearing, the contact surfaces of the pressing assembly are in facial line fit, slight bearing pressing force can be adjusted to incline, the pressing force deflection of the outer ring of the bearing is avoided, the bearing pressing force is ensured to be axial all the time and to be uniformly distributed on the contact surfaces of the bearing pressing ring and the outer ring of the bearing, and the problem that the bearing installation and positioning of the motor bearing are deflected due to uneven pressing force and deflection of locking force is avoided. The installation accuracy of the motor bearing is guaranteed, the running stability of the motor bearing is improved, and motor shaft noise and vibration are avoided. Meanwhile, the bearing has a simple structure, is convenient to install, has low technical requirements on bearing installation, and avoids the problems that the bearing is pressed unevenly and the locking force is deflected because the locking of the locking screw of the motor bearing pressure plate is uneven due to artificial installation factors, so that the vibration noise of the motor is generated. The invention is described in detail below with reference to specific examples:

as shown in fig. 1 and 2, the present invention provides a bearing pressing assembly, including:

the outer ring compression ring 21 is provided with an outer ring abutting surface at an axial first end surface and is used for abutting against the outer ring of the bearing, and an outer ring pressure bearing surface at an axial second end surface;

the outer ring pressing plate 11 is used for being fixed on the bearing seat 1 and providing pressing force for the outer ring pressing ring 21, an outer ring pressing surface is formed on the outer ring pressing plate 11, the outer ring pressing surface is in contact with the outer ring pressing surface and provides pressure for the outer ring pressing surface, the outer ring pressing surface is in surface line contact with the outer ring pressing surface, and the outer ring of the bearing is pressed in the bearing seat 1 through the outer ring pressing plate 11 and the outer ring pressing ring 21.

The inner ring compression ring 22 is provided with an inner ring abutting surface at an axial first end surface and is used for abutting against the inner ring of the bearing, and an inner ring pressure-bearing surface at an axial second end surface;

the inner ring pressing plate 12 comprises an inner ring pressing surface, the inner ring pressing surface is in contact with the inner ring bearing surface and provides pressure for the inner ring bearing surface, the inner ring pressing plate 12 abuts against a shaft shoulder of the rotating shaft, the inner ring pressing surface and the inner ring pressing surface are in surface line contact, and the inner ring pressing ring 22 is pressed through the inner ring pressing plate 12 and the inner ring pressing ring 22.

Preferably, the outer ring pressure bearing surface is formed toward an oblique outer side of the outer ring pressure ring 21, that is, the outer pressure bearing surface is formed at an outer edge of an end portion of the outer ring pressure ring 21, and the outer ring pressure bearing surface is a portion of a spherical surface whose spherical center is located on an axis of the outer ring pressure ring 21.

The radial dimension of the spherical surface is 1.5-2 times of the outer diameter dimension of the outer ring so as to ensure that the contact between the annular spherical surface where the outer ring pressure-bearing surface is located and the outer ring pressing surface is free from interference, the outer ring pressing surface is formed towards the inclined outer side of the outer ring pressing plate 11 on the radial inner side of the outer ring pressing plate 11, the outer ring pressing surface is constructed into an annular inclined surface or an annular raised cambered surface, and the outer ring pressure-bearing surface is in surface line contact with the outer ring pressing surface. Furthermore, the curvature radius of the outer ring compression surface is larger than the radius of the spherical surface where the outer ring pressure-bearing surface is located, so that the compression surface on the outer ring pressing plate 11 and the pressure-bearing surface on the outer ring pressing ring 21 can not interfere with each other when moving relatively.

A plurality of fixing holes are formed in the outer ring pressure plate 11 along the circumferential direction thereof, and are used for being matched with a connecting piece to fix the outer ring pressure plate 11 on the bearing seat 1.

The inner ring pressure-bearing surface is formed toward the obliquely inner side of the inner ring pressure ring 22, that is, the inner ring pressure-bearing surface is formed at the inner edge of the end portion of the inner ring pressure ring 22, the inner ring pressure-bearing surface is a part of a spherical surface, and the spherical center of the spherical surface where the inner ring pressure-bearing surface is located on the axis of the inner ring pressure ring 22. The radial dimension of the spherical surface is 1.5 to 2 times of the outer diameter dimension of the inner ring, so that the contact between the annular spherical surface where the pressure bearing surface of the inner ring is located and the pressing surface of the inner ring is free from interference.

The inner ring pressing surface is formed by the end surface of the inner ring pressing plate 12, the inner ring pressing surface is configured as an annular inclined surface or an annular raised cambered surface, and the inner ring pressing surface form surface line contact. Preferably, the curvature radius of the inner ring pressing surface is larger than the radius of the spherical surface on which the inner ring pressure bearing surface is located, so that the pressing surface on the inner ring pressing plate 12 and the pressure bearing surface on the inner ring pressing ring 22 do not interfere with each other when moving relatively.

Specifically, as shown in fig. 3 and 4, in the first embodiment:

in this embodiment, the outer ring pressing plate 11 is a circular ring, the inner circle of the circular ring is obliquely cut to form an annular surface, and the annular surface forms an outer ring pressing surface. 6-8 locking threaded holes, namely fixing holes, are circumferentially distributed at the position, close to the outer edge, of the outer ring pressure plate 11, and are matched with the bolts 30 to fixedly connect the outer ring pressure plate 11 to the bearing seat 1.

The outer ring pressing ring 21 is a circular ring, one end of the circular ring is a plane, and forms an outer ring pressing surface for pressing against the bearing outer ring 41, the other end of the outer ring pressing ring 21 forms an outer ring pressure bearing surface along the peripheral direction of the outer ring, the outer ring pressure bearing surface is a part of a spherical surface, and the outer ring pressure bearing surface is in contact with the outer ring pressing surface to form surface line contact, and applies pressure to the outer ring pressing surface.

The spherical center of the spherical surface on which the outer ring pressure-bearing surface is located is on the axis of the outer ring pressure ring 21 (i.e. on the axis of the main shaft 2), and in order to ensure that the outer ring pressure-bearing surface is in contact with the outer ring pressure-bearing surface without interference, the spherical radius is generally 1.5-2 times the outer wall radius of the bearing outer ring 41. The outer ring pressing surface and the outer ring bearing surface are pressed and tightly attached together, the pressing force of the outer ring pressing plate 11 is transmitted to the inner ring pressing ring 22 through the contact surface, and the bearing outer ring 41 is pressed through the inner ring pressing ring 22, so that the bearing outer ring 41 is pressed.

Preferably, the outer ring compression surface and the outer ring pressure bearing surface need surface quenching to meet the requirements of compression and wear resistance of contact surfaces;

the outer ring pressing plate 11 and the outer ring pressing ring 21 are contacted with the sphere-like surface through a plane. Because the center of circle of the outer ring pressing plate 11 is on the axis of the main shaft 2, the deflection of the outer ring pressing plate 11 is also deflected relative to the axis, and meanwhile, because the sphere-like spherical center of the inner ring pressing ring 22 is also on the axis of the main shaft 2, the plane of the outer ring pressing plate 11 can be ensured to be always attached to the spherical surface of the inner ring pressing ring 22, and the pressing force of the outer ring pressing plate 11 on the bearing outer ring 41 through the inner ring pressing ring 22 is ensured to be always axial.

In the structure shown in fig. 2, similarly, the inner ring pressing plate 12 is a circular ring, and the outer ring or an end surface of the circular ring is obliquely cut to form an annular surface, and the annular surface forms an inner ring pressing surface.

The inner ring pressing ring 22 is configured in a circular ring structure, and one end thereof is a flat surface to form an inner ring pressing surface, which is in contact with the bearing inner ring 42 and presses the bearing inner ring 42. The other end forms an outer ring pressure-bearing surface along the circumferential direction of the outer edge, the inner ring pressure-bearing surface is a part of a spherical surface, and the sphere center of the spherical surface where the outer ring pressure-bearing surface is located is on the axis of the inner ring pressure ring 22 (namely, on the axis of the main shaft 2). The inner ring pressing face is in contact with the inner ring pressure-bearing face and applies pressure thereto. The surface opposite to the inner ring pressing surface on the inner ring pressing plate 12 is attached to the shaft shoulder of the main shaft 2, the axial pressing force of the main shaft 2 is transmitted to the bearing inner ring 42 through the inner ring pressing ring 22 of the inner ring pressing plate 12, and because the inner ring pressing surface and the inner ring pressing surface between the inner ring pressing plate 12 and the inner ring pressing ring 22 are in contact adjustment, the inner ring pressing plate 12 can swing around the axis of the main shaft 2, so that the pressing force of the inner ring pressing ring 22 on the bearing inner ring 42 is always axial. The stress process of the inner ring pressing plate 12 and the inner ring pressing ring 22 is similar to that of the outer ring, the inner ring pressing plate 12 positions the shaft shoulder of the main shaft 2, the inner ring pressing plate 12 can deflect under the influence of the dimensional tolerance and the perpendicularity of the shaft shoulder, the pressing force of the deflected pressing force on the inner ring pressing ring 22 is uniform axial pressing force applied to the bearing inner ring 42 due to the contact of the inclined surface and the inner ring pressing surface, and the radial pressing force is offset through the inner diameter support of the main shaft 2 on the inner ring pressing ring 22, so that the pressing force applied to the bearing inner ring 42 is uniform axial pressing force.

The pressing component of the invention ensures that the pressing force is uniform and reliable, for example, the adjustment principle and the stress analysis process between the outer ring pressing surface and the outer ring pressing surface are as follows:

normal locking condition:

the outer ring pressing plate 11 and the outer ring pressing ring 21 are in contact force transmission through an outer ring pressing surface and an outer ring pressing surface, the bearing pressing plate locking screws can be uniformly locked, and the outer ring pressing plate 11 bears locking force F0 under the condition that the outer ring pressing plate 11 keeps axial uniform pressure on the outer ring pressing ring 21. The force of the outer ring pressure plate 11 against the inner ring pressure ring 22 on the contact surface is F, and if the frictional force of the contact between the outer ring pressure surface and the outer ring pressure receiving surface is small and negligible, the radial component force Fr of the force F cancels each other because the inner ring pressure ring 22 is a solid of revolution, and therefore the axial force Fa of the inner ring pressure ring 22 is the pressing force of the inner ring pressure ring 22 against the bearing outer ring 41, i.e., F1= Fa = F0. The bearing cup 41 is subjected to a uniform axial locking force.

Case of locking deflection of the locking screw:

when the locking force of the locking screw deflects, the outer ring pressure plate 11 swings along the outer ring pressure-bearing surface and deflects by a certain angle theta, and the pressure of the outer ring pressure plate 11 on the outer ring pressure ring 21 also deflects by the angle theta. But the locking force of the locking screw does not become F0' with respect to the direction before deflection. The pressure of the outer ring pressing plate 11 on the contact surface to the outer ring pressing ring 21 is F ', the radial component force Fr' of the pressure F 'is offset, the axial component force Fa' of the pressure F 'is also deflected by an angle θ along the axis of the main shaft 2, the axial component force Fa' of the pressure F 'provides a pressing force F1' to press the bearing outer ring 41 on one hand, and has a component force F3 in the radial direction of the main shaft 2 on the other hand, as shown in fig. 4, the component forces F3 on both sides are upward. Therefore, when the locking force of the locking screw is not uniform, the pressing force of the bearing ring 13 on the bearing outer ring 418 is F1' = F0' = Fa ' cos θ, the radial component force F3= Fa ' sin θ = F0' tan θ of the main shaft 2 of the bearing ring is offset by the pressure F4 provided by the inner wall of the bearing chamber on the outer ring pressing ring 21, and F4=2F3. Therefore, after the locking force of the locking screw deflects, the pressing force of the outer ring pressing ring 21 on the bearing outer ring 41 is still axial, the magnitude of the pressing force is also the locking force of the locking screw, and the generated radial component force cannot influence the pressing of the bearing outer ring 41. Therefore, the spherical contact between the outer ring pressing plate 11 and the outer ring pressing ring 21 can balance the pressing force of the bearing, and the outer ring 41 of the bearing can be ensured to be locked uniformly and reliably.

The outer ring pressure bearing surface of the outer ring pressing ring 21 is a sphere or a similar spherical surface, so that the symmetrical contact points of the outer ring pressing plate 11 and the spherical surface of the outer ring pressing ring 21 can deflect on the similar spherical surface at the same time, and the outer ring pressing plate 11 is always attached to the outer ring pressing ring 21 when swinging.

The second embodiment:

as shown in fig. 5 and 6, in the present embodiment, the outer ring pressing plate 11 is a circular ring, and the inner edge of the circular ring forms a convex annular curved surface facing the outer ring pressing ring 21, and the annular curved surface forms an outer ring pressing surface. 6-8 locking threaded holes, namely fixing holes, are circumferentially distributed at the position, close to the outer edge, of the outer ring pressing plate 11, and the outer ring pressing plate 11 is matched with the bolts 30 to fixedly connect the outer ring pressing plate 11 to the bearing seat 1.

The outer ring pressing ring 21 is a circular ring, one end of the circular ring is a plane and forms an outer ring pressing surface for pressing against the bearing outer ring 41, the other end of the outer ring pressing ring 21 forms an outer ring pressing surface along the circumferential direction of the outer edge of the outer ring, the outer ring pressing surface is a part of a spherical surface and contacts with the outer ring pressing surface to form surface line contact, and the outer ring pressing surface applies pressure to the outer ring pressing surface.

The spherical center of the spherical surface on which the outer ring pressure-bearing surface is located is on the axis of the outer ring pressure ring 21 (i.e. on the axis of the main shaft 2), and in order to ensure that the outer ring pressure-bearing surface is in contact with the outer ring pressure-bearing surface without interference, the spherical radius is generally 1.5-2 times the outer wall radius of the bearing outer ring 41. The outer ring pressing surface and the outer ring pressure-bearing surface are pressed and tightly attached together, the pressing force of the outer ring pressing plate 11 is transmitted to the inner ring pressing ring 22 through the contact surface, the bearing outer ring 41 is pressed through the inner ring pressing ring 22, and the bearing outer ring 41 is pressed.

Preferably, the outer ring compression surface and the outer ring bearing surface need surface quenching to meet the requirements of compression and wear resistance of the contact surface;

the outer ring pressing plate 11 and the outer ring pressing ring 21 are contacted with the sphere-like surface through a plane. Because the center of circle of the outer ring pressing plate 11 is on the axis of the main shaft 2, the deflection of the outer ring pressing plate 11 is also deflected relative to the axis, and meanwhile, because the sphere-like spherical center of the inner ring pressing ring 22 is also on the axis of the main shaft 2, the plane of the outer ring pressing plate 11 can be ensured to be always attached to the spherical surface of the inner ring pressing ring 22, and the pressing force of the outer ring pressing plate 11 on the bearing outer ring 41 through the inner ring pressing ring 22 is ensured to be always axial.

Example three:

as shown in fig. 7 and 8, in the present embodiment, the outer ring pressing plate 11 is a single circular ring, and an inner circle of the circular ring forms an outer ring pressing surface facing the outer ring pressing ring 21, and the outer ring pressing surface is a part of a spherical surface. 6-8 locking threaded holes, namely fixing holes, are circumferentially distributed at the position, close to the outer edge, of the outer ring pressure plate 11, and are matched with the bolts 30 to fixedly connect the outer ring pressure plate 11 to the bearing seat 1.

The outer ring pressing ring 21 is a circular ring, one end of the circular ring is a plane, and forms an outer ring pressing surface for pressing against the bearing outer ring 41, the other end of the outer ring pressing ring 21 forms an outer ring pressure bearing surface along the peripheral direction of the outer ring, the outer ring pressure bearing surface is a part of a spherical surface, and the outer ring pressure bearing surface is in contact with the outer ring pressing surface to form surface line contact, and applies pressure to the outer ring pressing surface. And the radius of the spherical surface where the outer ring pressing surface is located is larger than that of the spherical surface where the outer ring bearing surface is located.

The spherical center of the spherical surface on which the outer ring pressure-bearing surface is located is on the axis of the outer ring pressure ring 21 (i.e. on the axis of the main shaft 2), and in order to ensure that the outer ring pressure-bearing surface is in contact with the outer ring pressure-bearing surface without interference, the spherical radius is generally 1.5-2 times the outer wall radius of the bearing outer ring 41. The outer ring pressing surface and the outer ring pressure-bearing surface are pressed and tightly attached together, the pressing force of the outer ring pressing plate 11 is transmitted to the inner ring pressing ring 22 through the contact surface, the bearing outer ring 41 is pressed through the inner ring pressing ring 22, and the bearing outer ring 41 is pressed.

Preferably, the outer ring compression surface and the outer ring bearing surface need surface quenching to meet the requirements of compression and wear resistance of the contact surface;

the outer ring pressing plate 11 and the outer ring pressing ring 21 are contacted with the sphere-like surface through a plane. Because the center of circle of the outer ring pressing plate 11 is on the axis of the main shaft 2, the deflection of the outer ring pressing plate 11 is also deflected relative to the axis, and meanwhile, because the sphere-like spherical center of the inner ring pressing ring 22 is also on the axis of the main shaft 2, the plane of the outer ring pressing plate 11 can be ensured to be always attached to the spherical surface of the inner ring pressing ring 22, and the pressing force of the outer ring pressing plate 11 on the bearing outer ring 41 through the inner ring pressing ring 22 is ensured to be always axial.

Example four:

as shown in fig. 9 and 10, in the present embodiment, the outer ring pressing plate 11 is a single circular ring, and the outer ring pressing surface may be formed by chamfering or rounding the inner edge of the circular ring. 6-8 locking threaded holes, namely fixing holes, are circumferentially distributed at the position, close to the outer edge, of the outer ring pressing plate 11, and the outer ring pressing plate 11 is matched with the bolts 30 to fixedly connect the outer ring pressing plate 11 to the bearing seat 1.

The outer ring pressing ring 21 is a circular ring, one end of the circular ring is a plane and forms an outer ring pressing surface for pressing against the bearing outer ring 41, the other end of the outer ring pressing ring 21 forms an outer ring pressing surface along the circumferential direction of the outer edge of the outer ring, the outer ring pressing surface is a part of a spherical surface and contacts with the outer ring pressing surface to form surface line contact, and the outer ring pressing surface applies pressure to the outer ring pressing surface.

The spherical center of the spherical surface on which the outer ring pressure-bearing surface is located is on the axis of the outer ring pressure ring 21 (i.e. on the axis of the main shaft 2), and in order to ensure that the outer ring pressure-bearing surface is in contact with the outer ring pressure-bearing surface without interference, the spherical radius is generally 1.5-2 times the outer wall radius of the bearing outer ring 41. The outer ring pressing surface and the outer ring pressure-bearing surface are pressed and tightly attached together, the pressing force of the outer ring pressing plate 11 is transmitted to the inner ring pressing ring 22 through the contact surface, the bearing outer ring 41 is pressed through the inner ring pressing ring 22, and the bearing outer ring 41 is pressed.

Preferably, the outer ring compression surface and the outer ring bearing surface need surface quenching to meet the requirements of compression and wear resistance of the contact surface;

the outer ring pressing plate 11 and the outer ring pressing ring 21 are contacted with the sphere-like surface through a plane. Because the center of circle of the outer ring pressing plate 11 is on the axis of the main shaft 2, the deflection of the outer ring pressing plate 11 is also deflected relative to the axis, and meanwhile, because the sphere-like spherical center of the inner ring pressing ring 22 is also on the axis of the main shaft 2, the plane of the outer ring pressing plate 11 can be ensured to be always attached to the spherical surface of the inner ring pressing ring 22, and the pressing force of the outer ring pressing plate 11 on the bearing outer ring 41 through the inner ring pressing ring 22 is ensured to be always axial.

In the above embodiment, the outer ring pressing surface is formed in a different form of the inner circle processing of the outer ring pressing plate 11, so that the outer ring pressing plate 11 does not interfere with the spherical surface when swinging on the outer ring pressing surface of the outer ring pressing ring 21. The outer ring pressing surface can realize that the outer ring pressing plate 11 and the spherical surface of the outer ring pressing ring 21 do not interfere with the spherical surface when swinging on the spherical surface as long as the curvature radius of the outer ring pressing surface is larger than the radius of the spherical surface of the outer ring pressing ring 21, so that the invention not only comprises the above embodiments.

It is easy to think that the structure and the forming method of the inner ring pressing surface on the inner ring pressing plate 12 can adopt any one of the above embodiments, and the outer ring pressing surface and the inner ring pressing surface can be selected and combined with any structure.

The invention also provides a motor which comprises the bearing pressing assembly, wherein the outer ring pressing plate 11 is fixed on the bearing seat 1 through a connecting piece, and presses the outer ring pressing ring 21 on the outer ring of the bearing; the inner ring pressing plate 12 abuts against a shaft shoulder of the main shaft 2, and the inner ring pressing plate 12 is pressed through the shaft shoulder, so that the inner ring pressing ring 22 is pressed on the inner ring of the bearing.

The bearing pressing assembly provided by the invention has the advantages that the interference cannot be caused when the pressing assembly slightly deflects by adopting a surface line contact mode, the problem of deflection of uneven pressing force of the bearing is avoided, the running vibration and noise of a motor bearing are reduced, the motor shaft response is avoided, the running stability of the motor is improved, and the service life of the motor is prolonged. The structure is simple and convenient to mount, the technical requirement on mounting is not high, and the motor shaft noise caused by the uneven locking force and the deflection of the locking force of the bearing due to manual mounting is avoided, so that the service life of the motor is influenced; the motor bearing is ensured to run stably and reliably, and the vibration and noise of the motor are reduced.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the disclosure is not limited to the precise construction, arrangements, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. A bearing compresses tightly subassembly which characterized in that: the method comprises the following steps:

the axial first end surface of the outer ring compression ring forms an outer ring abutting surface which is used for abutting against the outer ring of the bearing, and the axial second end surface of the outer ring compression ring forms an outer ring pressure-bearing surface;

the outer ring pressing plate is used for being fixed on the bearing seat and providing pressing force for the outer ring pressing ring, an outer ring pressing surface is formed on the outer ring pressing plate, the outer ring pressing surface is in contact with the outer ring pressure-bearing surface and provides pressure for the outer ring pressure-bearing surface, and the outer ring pressing surface is in surface line contact with the outer ring pressing surface;

the inner ring compression ring is provided with an inner ring abutting surface at an axial first end surface and is used for abutting against the inner ring of the bearing, and an inner ring pressure-bearing surface is formed at an axial second end surface;

the inner ring pressing plate comprises an inner ring pressing surface, the inner ring pressing surface is in contact with the inner ring pressure bearing surface and provides pressure for the inner ring pressure bearing surface, the inner ring pressing plate is abutted against a shaft shoulder of the rotating shaft, and the inner ring abutting surface is in surface line contact with the inner ring pressing surface;

the inner ring bearing surface faces towards the inner side of the slant of the inner ring pressing ring, the inner ring bearing surface is a part of a spherical surface, and the spherical center of the spherical surface where the inner ring bearing surface is located on the axis of the inner ring pressing ring.

2. The bearing press assembly of claim 1, wherein: the outer ring bearing surface faces towards the oblique outer side of the outer ring pressing ring, the outer ring bearing surface is a part of a spherical surface, and the spherical center of the spherical surface where the outer ring bearing surface is located on the axis of the outer ring pressing ring.

3. The bearing press assembly of claim 2, wherein: the radial dimension of the spherical surface is 1.5-2 times of the outer diameter dimension of the outer ring.

4. The bearing press assembly of claim 2, wherein: the outer ring pressing surface is formed on the radial inner side of the outer ring pressing plate and faces towards the inclined outer side of the outer ring pressing plate, the outer ring pressing surface is constructed into an annular inclined surface or an annular raised cambered surface, and the outer ring pressing surface form the surface line contact.

5. The bearing clamp assembly of claim 4, wherein: the curvature radius of the outer ring compression surface is larger than the radius of the spherical surface where the outer ring bearing surface is located.

6. The bearing press assembly of claim 4, wherein: and a plurality of fixing holes are formed in the outer ring pressing plate along the circumferential direction of the outer ring pressing plate and are used for being matched with the connecting piece to fix the outer ring pressing plate on the bearing seat.

7. The bearing press assembly of claim 6, wherein: the radial dimension of the spherical surface is 1.5-2 times of the outer diameter dimension of the inner ring.

8. The bearing press assembly of claim 6, wherein: the inner ring pressing surface is formed by the end surface of the inner ring pressing plate, the inner ring pressing surface is an annular inclined surface or an annular raised cambered surface, and the inner ring pressing surface form the surface line contact.

9. The bearing press assembly of claim 8, wherein: the curvature radius of the inner ring pressing surface is larger than the radius of the spherical surface where the inner ring bearing surface is located.

10. An electric machine characterized by: the bearing pressing assembly comprises the bearing pressing assembly as claimed in any one of claims 1 to 9, wherein the outer ring pressing plate is fixed on the bearing seat through a connecting piece and presses the outer ring pressing ring on the outer ring of the bearing;

the inner ring pressing plate is abutted against a shaft shoulder of the motor spindle and tightly presses the inner ring pressing plate through the shaft shoulder, so that the inner ring pressing ring is tightly pressed on an inner ring of the bearing.

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