CN219576790U - Motor bearing mounting structure and motor - Google Patents

Abstract

The utility model discloses a motor bearing mounting structure which comprises a bearing inner cover, a bearing sleeve, a bearing outer cover and a bearing assembly, wherein the bearing inner cover, the bearing sleeve and the bearing outer cover are connected to the outer side of a rotating shaft, the bearing assembly comprises a pair of bearings sleeved on the outer side of the rotating shaft, a bearing inner spacer arranged between the pair of bearings, a bearing outer spacer arranged on the radial outer side of the bearing inner spacer, and a pre-tightening piece, the bearing outer spacer abuts against parts of the pair of bearings, and the pre-tightening piece is respectively connected with the bearing outer spacer and parts of the pair of bearings. The utility model also discloses a motor. The utility model utilizes the paired bearing structure of the bearing assembly, improves the supporting rigidity of the bearing assembly, solves the problem of rotor supporting, the bearing inner spacer and the bearing outer spacer solve the problem that heat of paired bearings cannot be radiated due to the increase of heat, the pretension piece solves the problem of vibration of paired bearing rolling bodies under the condition that the rotating shaft rotates at high speed, separates the two bearings of the paired bearings, reduces accumulation and improves the heat radiation of the bearings; the whole structure is convenient to disassemble and assemble.

Description

Motor bearing mounting structure and motor

Technical Field

The utility model belongs to the field of motors, and particularly relates to a motor bearing mounting structure and a motor.

Background

The axial pre-tightening method for installing the motor bearing mainly adopts positioning pre-tightening and constant pressure pre-tightening, and in the positioning pre-tightening, the pre-tightening purpose can be realized by using paired duplex bearings with pre-adjusted pre-tightening amount, and the user is not required to adjust the pre-tightening method again. The constant pressure pre-tightening is a method for properly pre-tightening the bearing by using a spiral spring, a disc spring and the like, and has the defects of overlong acting force transmission chain, poor pre-tightening force retentivity or clearance fit between a bearing seat and a shaft sleeve, and higher requirement on the machining precision of parts.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides a motor bearing mounting structure and a motor, which effectively solve the problem of bearing pre-tightening and are beneficial to heat dissipation.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a motor bearing mounting structure, includes the bearing inner cup, bearing housing and the bearing enclosing cover of connecting in the pivot outside, and locates bearing assembly between bearing inner cup, bearing housing and the bearing enclosing cover, bearing assembly is including the pair bearing of cover outside locating the pivot, locates the interior spacer of bearing between the pair bearing, locates the outer spacer of bearing of the radial outside of spacer in the bearing, and pretension piece, the outer spacer of bearing offsets with the part of pair bearing, pretension piece offsets with the part of outer spacer of bearing and pair bearing respectively.

The utility model utilizes the paired bearing structure of the bearing assembly, improves the supporting rigidity of the bearing assembly, solves the problem of rotor supporting, the bearing inner spacer bush and the bearing outer spacer bush solve the problem that heat of the paired bearings cannot be radiated due to the increase of heat quantity, the pretension piece solves the problem of vibration of paired bearing rolling bodies under the condition that the rotating shaft rotates at high speed, the damage of idle running of bearing balls is avoided, the two bearings of the paired bearings are separated, the accumulation is reduced, and the heat radiation capacity is increased and the heat radiation of the bearings is improved along with the increase of the heat radiation area of the bearing bush; because the high-speed motor is very sensitive to the unbalance of the rotor, the motor needs to perform dynamic balance for a plurality of times, the rotor of the motor is inspected to be disassembled and inspected for a plurality of times after the motor runs at a high speed, the vibration of the high-speed motor is very sensitive to the tiny change of the motor structure, the bearing mounting structure and other structural members of the motor are required to be incapable of generating harmful damages in the disassembling and inspecting process, all parts of the bearing mounting structure are arranged in the bearing sleeve by arranging the bearing sleeve, and the bearing sleeve is very good in thermal stability under the condition of ensuring the strength and the hardness; the bearing sleeve is connected with the bearing outer cover through bolts, and the bearing sleeve and the bearing outer cover are in small clearance fit, so that the bearing sleeve is well assembled; in a thermal state, the bearing sleeve and the bearing outer cover can be effectively matched due to different reasons; the assembly structures of the bearing inner cover, the bearing sleeve, the bearing outer cover and the paired bearings enable the whole structure to be convenient to assemble and disassemble, the bearings do not need to be assembled and disassembled, damage to the bearings can not be caused, and on-site dynamic balance is convenient to carry out; the structural design of the bearing sleeve also increases the heat dissipation area of the bearing, can effectively dissipate the heat of the bearing, and is beneficial to heat dissipation of the bearing.

Furthermore, the pre-tightening piece is an elastic piece, and the bearing outer spacer bush is provided with a mounting groove into which the pre-tightening piece extends. A plurality of mounting grooves are uniformly distributed on the bearing outer spacer, so that the stable assembly of the pre-tightening piece can be facilitated, the reasonable pre-tightening force provided by the pre-tightening piece is utilized for pre-tightening, and the problems of heat dissipation and stable operation of the pair bearing are solved.

Further, the bearing assembly further comprises a gasket attached to the end face of the bearing, and the pre-tightening piece abuts against the gasket. The gasket can evenly transmit the propping pressure of the pre-tightening piece to one of the pair of bearings, so that the relative balance of the pre-tightening force at all circumferential positions is ensured.

Further, when the pre-tightening piece is pressed by the bearing outer spacer bush and the bearing in opposite directions, the length of the pre-tightening piece extending out of the opening of the mounting groove is 0.4-0.6mm. The numerical value setting avoids that the pre-tightening piece does not reserve enough axial length to cause that the paired bearings cannot achieve good pre-tightening effect under the working condition of high speed and high temperature.

Further, the pair of bearings comprises two bearings, and the back surfaces of the two bearings are arranged in opposite directions. The two bearings which are installed back to back can be 70 series high-precision ceramic angular contact bearings, can be suitable for high rotation speed, has enough margin for bearing rigidity, and can ensure stable motor structure under the high-speed condition.

Further, the rotating shaft, the paired bearings and the bearing sleeve are radially abutted in sequence. No other connecting structure is arranged among the rotating shaft, the bearing and the bearing sleeve, the whole assembly structure is simple, and the transmission is effective.

Furthermore, the bearing sleeve is provided with a greasing channel which is arranged corresponding to the bearing outer spacer, and a circulation gap is arranged between the bearing inner spacer and the bearing outer spacer, and grease in the greasing channel is led to the paired bearings at two sides by the circulation gap. The lubrication channel of the motor is smooth, and the lubricating grease in the lubrication channel can effectively form an oil film under the conditions of high temperature and high speed, so that the reliable operation of the bearing assembly is ensured.

Further, the radial inner side of the bearing outer cover is provided with a lock nut assembly which comprises a first locking piece and a second locking piece which are axially overlapped, a plurality of notch parts are arranged on the outer wall of the second locking piece at intervals, and the notch parts penetrate through the thickness direction of the second locking piece. The arrangement of the notch part enables the outer wall of the second locking piece to be toothed, wind flow is formed when the second locking piece rotates at the rotating speed of 10000-15000 revolutions per minute, and the wind flow cannot be conducted to the inside, so that heat dissipation of the bearing is facilitated, and the temperature of the bearing is effectively reduced.

Further, at least a part of the notch is provided opposite to the flow gap.

The utility model also discloses a motor, which comprises a rotating shaft and the motor bearing mounting structure.

The beneficial effects of the utility model are as follows: the pair bearing structure of the bearing assembly is utilized, so that the supporting rigidity of the bearing assembly is improved, the rotor supporting problem is solved, the heat of the pair bearing is increased, the heat dissipation problem can not be solved, the pre-tightening piece solves the vibration problem of the pair bearing rolling bodies under the condition that the rotating shaft rotates at a high speed, the two bearings of the pair bearing are separated, the accumulation is reduced, and the heat dissipation of the bearing is improved; the whole structure is convenient to disassemble and assemble, and on-site dynamic balance is convenient to carry out; the structural design of the bearing sleeve also increases the heat dissipation area of the bearing, can effectively dissipate the heat of the bearing, and is beneficial to heat dissipation of the bearing; the lubricating grease in the grease adding channel can effectively form an oil film, so that the reliable operation of the bearing assembly is ensured.

Drawings

Fig. 1 is a partial cross-sectional view of a bearing mounting structure in an electric motor according to the present utility model.

Fig. 2 is an enlarged view of the structure at a in fig. 1.

Fig. 3 is a partially exploded view of the motor according to the present utility model.

Fig. 4 is an enlarged view of the structure at B in fig. 3.

The novel bearing comprises a 1-rotating shaft, a 2-bearing inner cover, a 3-bearing sleeve, a 4-bearing outer cover, 51, 52-paired bearings, 53-bearing inner spacers, 54-bearing outer spacers, 541-mounting grooves, 55-pretensioners, 56-gaskets, 6-greasing passages, 61-circulation gaps, 7-locking nut assemblies, 71-first locking pieces, 72-second locking pieces and 721-notch parts.

Detailed Description

In order to make the present utility model better understood by those skilled in the art, the following description of the technical solutions of the present utility model will be made in detail, but not all embodiments of the present utility model are apparent to some embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

As shown in fig. 1 to 4, a motor bearing mounting structure includes a bearing inner cap 2, a bearing housing 3 and a bearing outer cap 4 connected to the outside of a rotating shaft 1, and a bearing assembly provided between the bearing inner cap 2, the bearing housing 3 and the bearing outer cap 4. In the present embodiment, the bearing inner cap 2, the bearing sleeve 3, and the bearing outer cap 4 are assembled and connected in this order. The bearing assembly includes a pair of bearings 51, 52 fitted over the outside of the rotary shaft 1, a bearing inner spacer 53 provided between the pair of bearings 51, 52, a bearing outer spacer 54 provided radially outside the bearing inner spacer 53, and a pre-tightening member 55. The bearing outer spacer 54 abuts against portions of the pair of bearings 51, 52, and the pretensioner 55 abuts against portions of the bearing outer spacer 54 and the pair of bearings 51, 52, respectively.

Specifically, the pre-tightening member 55 is an elastic member, and the bearing outer spacer 54 is provided with a plurality of mounting grooves 541, and the pre-tightening member 55 extends into the mounting grooves 541. As shown in fig. 4, in this embodiment, the bearing outer spacer 54 has a ring-shaped structure, and is formed by a group of three mounting grooves 541, six groups of mounting grooves 541 are provided on the bearing outer spacer 54, and correspondingly, 18 pretensioning members 55 are respectively assembled into the mounting grooves 541, and one end abuts against the inner bottom surface of the mounting groove 541, and the other end extends out from the opening of the mounting groove 541.

The bearing inner spacer 3 is also of a circular ring structure, and the end surfaces of the two sides of the bearing inner spacer are respectively abutted against the paired bearings 51 and 52. The axial thickness of the bearing inner spacer 3 is greater than the axial thickness of the bearing outer spacer 54 so that the pretension member 55 can extend beyond the end face of the bearing outer spacer 54.

The bearing assembly further includes a spacer 56 attached to an end face of the bearing, and as illustrated in the direction shown in fig. 1, the pair of bearings is two bearing structures that appear in pairs, the left side of the pair of bearings is the first bearing 51, the right side is the second bearing 52, the back faces of the first bearing 51 and the second bearing 52 are opposite, the spacer 56 is attached to the end face of the second bearing 52, and the pretensioner 55 abuts against the spacer 56. So that the pressure of the pretensioning member 55 can be transmitted to the spacer 56 first and then uniformly to the second bearing 52. Of course, in other embodiments, two or more pairs of bearings may be present.

In this embodiment, the rotating shaft 1, the first bearings 51 of the paired bearings, and the bearing housing 3 are radially abutted in order from inside to outside, and the rotating shaft 1, the second bearings 52 of the paired bearings, and the bearing body 3 are radially abutted in order from inside to outside.

In order to control the elastic pressure of the pretension 55 against the first bearing 51 and the second bearing 52, this is achieved by controlling the axial length of the pretension 55. Specifically, when the pre-tension member 55 is pressed toward each other by the bearing outer spacer 54 and the second bearing 52, the pre-tension member 55 protrudes from the opening of the mounting groove 541 by a length of 0.4 to 0.6mm, i.e., s=0.4 to 0.6mm in fig. 2.

The bearing housing 3 is provided with a grease adding channel 6 which is arranged corresponding to the bearing outer spacer 54, wherein the corresponding arrangement means that the end part of the grease adding channel 6 corresponds to the outer wall of the bearing outer spacer 54, a circulation gap 61 is arranged between the bearing inner spacer 53 and the bearing outer spacer 54, so that grease in the grease adding channel 6 can infiltrate into the circulation gap 61 from the radial through holes of the bearing outer spacer 54, drain to the bearings 51 and 52 at two sides, enter into the bearing roller paths, and waste oil finally flows into the storage cavities of the bearing inner cover 2 and the bearing outer cover 4. The greasing channel 6 can be connected with an automatic greasing device, and grease can be quantitatively injected on time to ensure that enough grease exists in the motor, and the grease can be special high-temperature high-speed grease to ensure that a stable and effective oil film is formed between the bearing balls and the roller path under working conditions, so that the bearing can stably run.

As shown in fig. 1 and 3, the motor bearing mounting structure further includes a lock nut assembly 7 located radially inward of the bearing outer cover 4, and including a first lock member 71 and a second lock member 72 axially overlapped, and a plurality of notch portions 721 are provided at intervals on an outer wall of the second lock member 72, and the notch portions 721 penetrate through a thickness direction of the second lock member 72. At least part of the notch 721 is provided to face the flow gap 61, so that grease can permeate through the notch 721 to the first locking member 71, and the grease hole of the first locking member 71 can be blocked by the fastening glue.

The assembly process of the motor bearing mounting structure comprises the steps of pushing a bearing inner cover 2 onto a rotating shaft 1, heating a second bearing 52 to about 80 ℃, sleeving the bearing inner spacer 53 on the outer side of the rotating shaft 1 and propping against the end face of the second bearing 52, placing a pre-tightening piece 55 into a bearing outer spacer 54, sleeving the bearing outer spacer 54 on the outer side of the bearing inner spacer 53, radially leaving a circulation gap 61 between the bearing inner spacer and the bearing outer spacer, sleeving a gasket 56 before the bearing outer spacer 54 is assembled, enabling a pre-tightening piece 55 to prop against the gasket 56, and filling lubricating grease on the gasket 56 and the pre-tightening piece 55 before the assembly; the first bearing 51 is sleeved outside the rotating shaft 1 after being heated to about 80 ℃, the first bearing 51 is extruded towards the direction of the second bearing 52 by the second locking member 72 until the pretensioning member 55, the gasket 56 and the second bearing 52 are elastically abutted, and the second locking member 72 is locked by the first locking member 71; fixing the bearing inner cover 2 by using bolts and fastening glue; the bearing outer cover 4 is fixedly assembled by using bolts and fastening glue.

The utility model also discloses a motor which comprises a rotating shaft 1, a stator, a rotor and the motor bearing mounting structure.

The foregoing detailed description is provided to illustrate the present utility model and not to limit the utility model, and any modifications and changes made to the present utility model within the spirit of the present utility model and the scope of the appended claims fall within the scope of the present utility model.

Claims (10)

1. The utility model provides a motor bearing mounting structure, includes bearing inner cup (2), bearing housing (3) and bearing enclosing cover (4) of connecting in pivot (1) outside, and locates bearing assembly between bearing inner cup (2), bearing housing (3) and bearing enclosing cover (4), its characterized in that: the bearing assembly comprises paired bearings (51, 52) sleeved on the outer side of the rotating shaft (1), a bearing inner spacer (53) arranged between the paired bearings (51, 52), a bearing outer spacer (54) arranged on the radial outer side of the bearing inner spacer (53), and a pre-tightening piece (55), wherein the bearing outer spacer (54) is propped against the parts of the paired bearings (51, 52), and the pre-tightening piece (55) is propped against the parts of the bearing outer spacer (54) and the paired bearings (51, 52) respectively.

2. The motor bearing mounting structure according to claim 1, wherein: the pre-tightening piece (55) is an elastic piece, and the bearing outer spacer bush (54) is provided with a mounting groove (541) into which the pre-tightening piece (55) extends.

3. The motor bearing mounting structure according to claim 1 or 2, characterized in that: the bearing assembly further comprises a gasket (56) attached to the end face of the bearing, and the pre-tightening piece (55) abuts against the gasket (56).

4. The motor bearing mounting structure according to claim 2, characterized in that: when the pre-tightening piece (55) is pressed by the bearing outer spacer (54) and the bearing in opposite directions, the length of the pre-tightening piece (55) extending out of the opening of the mounting groove (541) is 0.4-0.6mm.

5. The motor bearing mounting structure according to claim 1, wherein: the pair of bearings (51, 52) includes two bearings, and the back surfaces of the two bearings are disposed opposite to each other.

6. The motor bearing mounting structure according to claim 1, wherein: the rotating shaft (1), the paired bearings (51, 52) and the bearing sleeve (3) are radially abutted in sequence.

7. The motor bearing mounting structure according to claim 1, wherein: the bearing sleeve (3) is provided with a greasing channel (6) which is arranged corresponding to the bearing outer spacer sleeve (54), a circulation gap (61) is arranged between the bearing inner spacer sleeve (53) and the bearing outer spacer sleeve (54), and the circulation gap (61) is used for guiding lubricating grease in the greasing channel (6) to the paired bearings (51, 52) at two sides.

8. The motor bearing mounting structure according to claim 7, wherein: the novel bearing further comprises a lock nut assembly (7) which is positioned on the radial inner side of the bearing outer cover (4) and comprises a first locking piece (71) and a second locking piece (72) which are axially overlapped, a plurality of notch parts (721) are arranged on the outer wall of the second locking piece (72) at intervals, and the notch parts (721) penetrate through the thickness direction of the second locking piece (72).

9. The motor bearing mounting structure of claim 8, wherein: at least part of the notch (721) is disposed opposite to the flow gap (61).

10. An electric motor comprising a rotating shaft (1), and a motor bearing mounting structure according to any one of claims 1-9.