CN113915235A - Motor end cover shaft sleeve and preparation method thereof - Google Patents

Motor end cover shaft sleeve and preparation method thereof Download PDF

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Publication number
CN113915235A
CN113915235A CN202111153448.3A CN202111153448A CN113915235A CN 113915235 A CN113915235 A CN 113915235A CN 202111153448 A CN202111153448 A CN 202111153448A CN 113915235 A CN113915235 A CN 113915235A
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China
Prior art keywords
outer ring
shaft sleeve
motor end
material powder
end cover
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CN202111153448.3A
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Chinese (zh)
Inventor
黄韦
顾江平
张蓓
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Anqing TP Goetze Liner Co Ltd
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Anqing TP Goetze Liner Co Ltd
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Priority to CN202111153448.3A priority Critical patent/CN113915235A/en
Publication of CN113915235A publication Critical patent/CN113915235A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/04—Casting in, on, or around objects which form part of the product for joining parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/122—Multilayer structures of sleeves, washers or liners
    • F16C33/125—Details of bearing layers, i.e. the lining
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • F16C33/145—Special methods of manufacture; Running-in of sintered porous bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C37/00—Cooling of bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The invention provides a motor end cover shaft sleeve which comprises an outer ring and inner rings uniformly distributed along the circumferential direction of an inner circle of the outer ring, wherein the outer ring is made of a material comprising a matrix tissue, a foaming agent and unavoidable impurities; the matrix structure is a Fe-C alloy body with the mass fraction of 95-99 percent in terms of mass fraction accounting for the total proportion of the outer ring material; the fatigue resistance strength of the shaft sleeve is 125-155 MPa, the heat dissipation performance is 25-55W/(m.K), and the bonding strength is 25-50 MPa. The invention also provides a preparation method of the motor end cover shaft sleeve. According to the invention, the outer ring forms porous foam pores, and the existence of the pores can not only reduce the quality of the shaft sleeve, but also improve the associativity of the shaft sleeve and the end cover, improve the heat dissipation of the shaft sleeve, facilitate the heat transfer in the high-speed rotation process of the bearing, and reduce the risk of thermal deformation failure of the bearing; the inner ring is made of solid material, is a working area where the shaft sleeve is in contact with the bearing, and has high wear resistance.

Description

Motor end cover shaft sleeve and preparation method thereof
Technical Field
The invention relates to the technical field of motor production equipment, in particular to a motor end cover shaft sleeve and a preparation method thereof.
Background
The motor end covers are covers positioned at two ends of a motor, mainly play a role in determining the space position of a rotor shaft, simultaneously have the functions of heat dissipation and dust prevention, and are usually arranged between a shaft sleeve and the rotating shaft and the end covers so as to protect the rotating shaft in order to avoid abrasion between the rotating shaft of the motor and a shaft hole of the end cover caused by long-term use. The rotating shaft and the shaft sleeve continuously generate relative motion in the working process, and a large amount of heat can be generated in the motion process, so that the requirements on the fatigue resistance, the wear resistance, the heat dissipation performance, the strength, the hardness and the like of the shaft sleeve are high, the shaft sleeve in the prior art has defects in structural design, materials and the like, the combination of the shaft sleeve and the end cover is poor, the heat dissipation performance of the shaft sleeve is not ideal, the heat transfer in the high-speed rotation process of the bearing is not facilitated, and the bearing is easy to generate heat deformation failure.
Disclosure of Invention
The shaft sleeve provided by the invention has high associativity with a motor end cover and good heat dissipation effect, and can transfer generated heat in the high-speed rotation process of a bearing and reduce the thermal deformation failure of the bearing.
In order to solve the technical problems, the invention adopts the following technical scheme:
a motor end cover shaft sleeve comprises an outer ring and inner rings uniformly distributed along the circumferential direction of an inner circle of the outer ring, wherein the outer ring is made of a material comprising a matrix tissue, a foaming agent and unavoidable impurities, and the inner ring is made of a material comprising a matrix tissue and unavoidable impurities;
wherein the foaming agent is dispersed in the matrix structure of the outer ring;
the base body structure is a Fe-C alloy body with the mass fraction of 95-99%, the mass fraction of the foaming agent is 1-5%, and the balance is unavoidable impurities;
the matrix structure is a Fe-C alloy body with the mass fraction of 99-99.99% and the balance of unavoidable impurities in terms of mass fraction accounting for the total proportion of the inner ring material;
the fatigue resistance strength of the shaft sleeve is 125-155 MPa, the heat dissipation performance is 25-55W/(m.K), and the bonding strength is 25-50 MPa.
Preferably, the inner ring comprises a fixing part arranged at the end part of the outer ring and distributed along the circumferential direction of the inner circle of the outer ring and a contact part arranged on the inner circle of the outer ring at the side far away from the fixing part.
Preferably, the fixing portion and the contact portion are both attached to the inner circle of the outer ring in an annular manner, wherein the inner circle of the contact portion is provided with a taper A extending towards the axis direction of the contact portion along the direction away from the fixing portion, and A is greater than or equal to 0 and less than or equal to 1 deg.
Preferably, the outer ring, the fixing portion, and the contact portion are integrally formed.
Preferably, the blowing agent is NH4Cl。
A preparation method of a motor end cover shaft sleeve comprises the following steps:
respectively preparing outer ring material powder and inner ring material powder according to respective proportions;
respectively feeding the outer ring material powder and the inner ring material powder into a die cavity of a forming press, and pressing to form a formed green body;
and (4) putting the molded green body into a sintering furnace for sintering and molding.
According to the technical scheme, the invention has the following beneficial effects: according to the invention, the foaming agent is added into the outer ring material, the foaming agent volatilizes during high-temperature sintering, foam pores are formed in the outer ring, the quality of the shaft sleeve can be reduced due to the existence of the pores, meanwhile, when the aluminum alloy shell is poured, a melt of the aluminum alloy shell can fully permeate into the pores of the outer ring under the action of high-pressure, the bonding property of the shaft sleeve and the end cover can be effectively improved, the heat dissipation of the shaft sleeve is improved due to the full permeation of the aluminum alloy, the heat transfer in the high-speed rotation process of the bearing is facilitated, and the risk of thermal deformation failure is reduced.
Drawings
FIG. 1 is a cross-sectional view of a motor end cap bushing of the present invention;
FIG. 2 is a schematic diagram of the distribution of inner pores of the outer ring.
In the figure: 10. an outer ring; 20. an inner ring; 210. a fixed part; 220. a contact portion.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1:
referring to fig. 1, a motor end cover shaft sleeve comprises an outer ring 10 and inner rings 20 uniformly distributed along the circumferential direction of an inner circle of the outer ring, wherein an outer ring material comprises a matrix structure, a foaming agent and unavoidable impurities, and an inner ring material comprises a matrix structure and unavoidable impurities;
wherein, the foaming agent is dispersed in the matrix structure of the outer ring;
the matrix structure is a Fe-C alloy body with the mass fraction of 95 percent, the mass fraction of the foaming agent is 5 percent, and the balance is unavoidable impurities;
the matrix structure is a Fe-C alloy body with the mass fraction of 99 percent, and the balance is inevitable impurities.
As a preferable technical scheme of the invention, the inner ring comprises a fixed part 210 which is arranged at the end part of the outer ring and distributed along the circumferential direction of the inner circle of the outer ring and a contact part 220 which is arranged at the inner circle of the outer ring at the side far away from the fixed part, the fixed part has the function of limiting and can prevent the bearing arranged in the inner ring from axially moving, and the contact part is contacted with the outer ring of the bearing and can fix the bearing from the radial direction, so that the bearing in the shaft sleeve can be effectively fixed by using the fixed part and the contact part.
Further, the fixing portion 210 and the contact portion 220 are both attached to the inner circle of the outer ring in an annular shape, wherein the inner circle of the contact portion is provided with a taper A extending towards the axis direction of the contact portion along the direction away from the fixing portion, A is not less than 0 and not more than 1 degree, the conical surface extending towards the axis direction of the contact portion is in contact with the outer ring of the bearing, and the bearing can be prevented from jumping in the circumferential direction due to abrasion.
Further, the outer ring, the fixing portion and the contact portion are integrally formed, and specifically, the outer ring, the fixing portion and the contact portion are integrally formed through pressing.
Further, the foaming agent is NH4Cl, this foamer and outer lane material's basal body tissue intensive mixing back, become the unburned bricks through the press forming, the unburned bricks is after the high temperature sintering, the foamer volatilizees, thereby form pore structure at the outer lane, the quality of axle sleeve can be reduced on the one hand to the existence of this pore structure, on the other hand aluminum alloy's end cover casing is when the pouring, its fuse-element can fully permeate the hole of outer lane 10 under the effect of high pressure, can promote the associativity of axle sleeve and end cover, the aluminum alloy fully permeates in the axle sleeve, the thermal diffusivity of axle sleeve has been improved simultaneously, be favorable to the high-speed transmission of the heat of rotation in-process of bearing, reduce the risk that the bearing heat altered shape became invalid.
In the invention, both the outer ring material and the inner ring material comprise Fe-C alloy body matrix structures, and the Fe-C alloy body comprises 0.35% of C, 0.17% of Si, 0.31% of Mn, 0.2% of P, 0.2% of S, 0.3% of Cr, 0.4% of Ni, the balance of Fe and inevitable impurities by mass fraction of the matrix structures.
The preparation of the shaft sleeve comprises the following steps:
respectively preparing outer ring material powder and inner ring material powder according to respective proportions;
the outer ring material powder and the inner ring material powder are respectively fed into a die cavity of a forming press and are pressed to form a formed green body, and the outer ring and the inner ring can have different internal organizational structures by respectively feeding, so that the outer ring and the inner ring have different service performances;
and (4) putting the molded green body into a sintering furnace for sintering and molding.
As a preferable embodiment of the present invention, the step of preparing the outer race material powder and the inner race material powder includes steps of weighing the powder, screening the outer race material powder and mixing the outer race material powder and the inner race material powder with a mixer, that is, steps of weighing, screening and mixing the outer race material powder and the inner race material powder, respectively, to obtain the raw material powder.
Furthermore, the process of configuring the outer ring material powder comprises the step of mixing a foaming agent with the matrix structure, and the foaming agent and the outer ring matrix structure are fully mixed to form a uniformly distributed dispersed phase in the matrix structure, so that the uniform dispersed phase is volatilized in the subsequent sintering process to form a foam structure in the matrix structure.
Further, a 16-mesh screen is adopted in the screen screening process; the mixer is a V-shaped mixer; the sintering temperature was 800 ℃.
Example 2:
a motor end cover shaft sleeve comprises an outer ring 10 and inner rings 20 which are uniformly distributed along the circumferential direction of an inner circle of the outer ring, wherein the outer ring is made of a material comprising a matrix tissue, a foaming agent and unavoidable impurities, and the inner ring is made of a material comprising a matrix tissue and unavoidable impurities;
wherein, the foaming agent is dispersed in the matrix structure of the outer ring;
the matrix structure is a Fe-C alloy body with the mass fraction of 99 percent, the mass fraction of the foaming agent is 1 percent, and the balance is inevitable impurities;
the matrix structure is a Fe-C alloy body with the mass fraction of 99.99% and inevitable impurities in terms of mass fraction accounting for the total proportion of the inner ring material.
As a preferable technical scheme of the invention, the inner ring comprises a fixed part 210 which is arranged at the end part of the outer ring and distributed along the circumferential direction of the inner circle of the outer ring and a contact part 220 which is arranged at the inner circle of the outer ring at the side far away from the fixed part, the fixed part has the function of limiting and can prevent the bearing arranged in the inner ring from axially moving, and the contact part is contacted with the outer ring of the bearing and can fix the bearing from the radial direction, so that the bearing in the shaft sleeve can be effectively fixed by using the fixed part and the contact part.
Further, the fixing portion 210 and the contact portion 220 are both attached to the inner circle of the outer ring in an annular shape, wherein the inner circle of the contact portion is provided with a taper A extending towards the axis direction of the contact portion along the direction away from the fixing portion, A is not less than 0 and not more than 1 degree, the conical surface extending towards the axis direction of the contact portion is in contact with the outer ring of the bearing, and the bearing can be prevented from jumping in the circumferential direction due to abrasion.
Further, the outer ring, the fixing portion and the contact portion are integrally formed, and specifically, the outer ring, the fixing portion and the contact portion are integrally formed through pressing.
Further, the foaming agent is NH4Cl, this foamer and outer lane material's base member tissue intensive mixing back, form the blank through the press forming, the blank is after the high temperature sintering, the foamer volatilizees, thereby form pore structure at the outer lane, the quality of axle sleeve can be reduced on the one hand to the existence of this pore structure, the end cover casing of on the other hand aluminum alloy is when the pouring, its fuse-element can fully permeate the hole of outer lane 10 under the effect of high pressure, can promote the associativity of axle sleeve and end cover, the aluminum alloy fully permeates in the axle sleeve, the thermal diffusivity of axle sleeve has been improved simultaneously, be favorable to the high-speed transmission of the heat of rotating the in-process of bearing, reduce the thermal deformation inefficacy of bearing.
In the present invention, both the outer ring material and the inner ring material include a matrix structure of an Fe — C alloy body, and the Fe-C alloy body of the present embodiment includes, in terms of mass fraction of the matrix structure, 3.5% of C, 2.4% of Si, 1.2% of Mn, 0.2% of P, 0.2% of S, 0.3% of Cr, 0.4% of Ni, and the balance Fe and unavoidable impurities.
The invention also discloses a preparation method of the motor end cover shaft sleeve, which comprises the following steps:
respectively preparing outer ring material powder and inner ring material powder according to respective proportions;
the outer ring material powder and the inner ring material powder are respectively fed into a die cavity of a forming press and are pressed to form a formed green body, and the outer ring and the inner ring can have different internal organizational structures by respectively feeding, so that the outer ring and the inner ring have different service performances;
and (4) putting the molded green body into a sintering furnace for sintering and molding.
As a preferable embodiment of the present invention, the step of preparing the outer race material powder and the inner race material powder includes steps of weighing the powder, screening the outer race material powder and mixing the outer race material powder and the inner race material powder with a mixer, that is, steps of weighing, screening and mixing the outer race material powder and the inner race material powder, respectively, to obtain the raw material powder.
Furthermore, the process of configuring the outer ring material powder comprises the step of mixing a foaming agent with the matrix structure, and the foaming agent and the outer ring matrix structure are fully mixed to form a uniformly distributed dispersed phase in the matrix structure, so that the uniform dispersed phase is volatilized in the subsequent sintering process to form a foam structure in the matrix structure.
Further, a 1200-mesh screen is adopted in the screen screening process; the mixer is a V-shaped mixer; the sintering temperature was 900 ℃.
Table one, experiments were performed on the motor end cover shaft sleeve manufactured using the above materials and the manufacturing method. Comparative examples 1, 2, 3, 4, 5, 6, 7 of the prior art are compared with different design parameters of the blowing agent:
Figure BDA0003287836860000051
table two, selecting the case in table one, and performing experimental analysis on the fatigue resistance, wear resistance, heat dissipation performance, bonding strength and hardness of the shaft sleeve (wherein the fatigue resistance refers to the shaft sleeve vibration 10)7After the number of times, the stress measured at the time of fracture is generated; bonding strength refers to the bonding strength between the shaft sleeve and the end cover):
Figure BDA0003287836860000061
in summary, the fatigue resistance, the heat dissipation performance and the bonding strength of the motor end cover shaft sleeves manufactured in the experimental examples 1, 2 and 3 all meet the design requirements, meanwhile, the data of the fatigue resistance, the heat dissipation performance and the bonding strength are all improved compared with the data of the comparative examples 1, 2 and 3, and the data of the wear resistance and the hardness are basically the same as the data of the comparative examples 1, 2 and 3, so that the fatigue resistance, the heat dissipation performance and the bonding strength of the shaft sleeve and the end cover, which have great influence on the performance of the shaft sleeve, can be effectively improved. This is because the foaming agent is added to the material of the outer ring, and the foaming agent volatilizes when sintered at a high temperature, and pores are formed in the outer ring, and the distribution of the pores is shown in fig. 2, in which S1 and S2 … … Sn represent the pore volume. The existence in hole not only can reduce the quality of axle sleeve, and simultaneously when the aluminum alloy shell pouring, its fuse-element can fully permeate the hole of outer lane under high pressure effect in, can effectively promote the associativity of axle sleeve and end cover, and the abundant infiltration of aluminum alloy has improved the thermal diffusivity of axle sleeve, is favorable to the bearing to rotate the thermal transmission of in-process at a high speed, reduces the possibility that thermal deformation became invalid.
In addition, as can be seen from comparative examples 4, 5, 6 and 7, as the proportion of the foaming agent in the outer ring increases, the fatigue resistance, heat dissipation performance and bonding strength of the shaft sleeve tend to decrease, because when the mass fraction of the foaming agent in the total proportion of the outer ring material is between 1 and 5 percent, the formed foam pores increase as the quantity of the foaming agent increases, the aluminum alloy melt can fully enter the pores and be fully bonded with the shaft sleeve, the bonding strength of the end cover and the shaft sleeve is improved, and the overall fatigue resistance and heat dissipation performance of the shaft sleeve are improved; however, as the content of the foaming agent is continuously increased to a certain value (i.e., > 5%), the pores are communicated with each other as the pores are increased, the bonding surface between the aluminum alloy melt and the shaft sleeve is reduced, the corresponding bonding strength is reduced, and the fatigue resistance and the heat dissipation performance of the shaft sleeve are reduced accordingly.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (10)

1. The motor end cover shaft sleeve is characterized by comprising an outer ring (10) and inner rings (20) which are uniformly distributed along the circumferential direction of an inner circle of the outer ring, wherein the outer ring comprises a base body tissue, a foaming agent and unavoidable impurities;
wherein the foaming agent is dispersed in the matrix structure of the outer ring;
the base body structure is a Fe-C alloy body with the mass fraction of 95-99%, the mass fraction of the foaming agent is 1-5%, and the balance is unavoidable impurities;
the matrix structure is a Fe-C alloy body with the mass fraction of 99-99.99% and the balance of unavoidable impurities in terms of mass fraction accounting for the total proportion of the inner ring material;
the fatigue resistance strength of the shaft sleeve is 125-155 MPa, the heat dissipation performance is 25-55W/(m.K), and the bonding strength is 25-50 MPa.
2. The motor end sleeve according to claim 1, wherein the inner ring comprises a fixing portion (210) provided at an end portion of the outer ring and circumferentially distributed along an inner circle of the outer ring, and a contact portion (220) provided at an inner circle of the outer ring on a side of the outer ring away from the fixing portion.
3. The motor end cover shaft sleeve as claimed in claim 2, wherein the fixing portion (210) and the contact portion (220) are both attached to an inner circle of the outer ring in a ring shape, wherein the inner circle of the contact portion is provided with a taper A extending towards the axial direction of the contact portion along the direction away from the fixing portion, and A is greater than or equal to 0 and less than or equal to 1 degrees.
4. The motor end sleeve of claim 2 wherein said outer race, said fixed portion and said contact portion are integrally formed.
5. The motor end cap bushing of claim 3 wherein said blowing agent is NH4Cl。
6. The motor end sleeve of claim 3, wherein said Fe-C alloy body comprises, in total mass fraction based on the matrix structure of said outer and inner ring materials, 0.35-3.5% C, 0.17-2.4% Si, 0.31-1.2% Mn, 0.2% or less P, 0.2% or less S, 0.3% or less Cr, 0.4% or less Ni, and the balance Fe and unavoidable impurities.
7. A method for preparing a motor end sleeve according to any one of claims 1 to 6, comprising the steps of:
respectively preparing outer ring material powder and inner ring material powder according to respective proportions;
respectively feeding the outer ring material powder and the inner ring material powder into a die cavity of a forming press, and pressing to form a formed green body;
and (4) putting the molded green body into a sintering furnace for sintering and molding.
8. The method according to claim 7, wherein the step of preparing the outer ring material powder and the inner ring material powder comprises the steps of weighing the powders, screening the mesh screens, and mixing the powders by a mixer.
9. The method as claimed in claim 8, wherein the step of preparing the powder of the outer ring material includes a step of mixing a foaming agent with the matrix structure.
10. The method of claim 9, wherein a 16-1200 mesh screen is used in the screen screening process; the mixer is a V-shaped mixer; the sintering temperature is 800-900 ℃.
CN202111153448.3A 2021-09-29 2021-09-29 Motor end cover shaft sleeve and preparation method thereof Pending CN113915235A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6296646A (en) * 1985-10-22 1987-05-06 Sumitomo Electric Ind Ltd Alloy member for pump shaft sleeve and bearing
CN102454715A (en) * 2011-08-12 2012-05-16 万向钱潮股份有限公司 Cardan universal joint, and manufacturing method for shaft sleeve for cardan universal joint
CN102478078A (en) * 2010-11-24 2012-05-30 大连创达技术交易市场有限公司 Novel shaft sleeve for textile machinery
CN106041099A (en) * 2016-06-23 2016-10-26 合肥工业大学 High-strength antifriction double-layered iron base powder metallurgy material and preparation method thereof
CN108223457A (en) * 2017-12-16 2018-06-29 朱浩奇 A kind of cooling denoising device of household fan motor
CN211377768U (en) * 2020-01-10 2020-08-28 浙江方正电机股份有限公司 Prevent bearing inner race ring bush structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6296646A (en) * 1985-10-22 1987-05-06 Sumitomo Electric Ind Ltd Alloy member for pump shaft sleeve and bearing
CN102478078A (en) * 2010-11-24 2012-05-30 大连创达技术交易市场有限公司 Novel shaft sleeve for textile machinery
CN102454715A (en) * 2011-08-12 2012-05-16 万向钱潮股份有限公司 Cardan universal joint, and manufacturing method for shaft sleeve for cardan universal joint
CN106041099A (en) * 2016-06-23 2016-10-26 合肥工业大学 High-strength antifriction double-layered iron base powder metallurgy material and preparation method thereof
CN108223457A (en) * 2017-12-16 2018-06-29 朱浩奇 A kind of cooling denoising device of household fan motor
CN211377768U (en) * 2020-01-10 2020-08-28 浙江方正电机股份有限公司 Prevent bearing inner race ring bush structure

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