Motor and machine tool

Abstract

The invention provides a motor and a machine tool, the motor comprises a rotor, an expansion sleeve and a shaft core, the expansion sleeve is arranged in a shaft hole, and the peripheral wall surface of the expansion sleeve is in interference fit with the shaft hole; the shaft core comprises an installation section, and the expansion sleeve hole is arranged on the installation section in a sleeving mode. A plurality of shaft core matching surfaces are formed on the outer peripheral wall surface of the mounting section, and a plurality of expansion sleeve matching surfaces are formed on the inner peripheral wall surface of the expansion sleeve; the plurality of shaft core matching surfaces and the plurality of expansion sleeve matching surfaces are in one-to-one correspondence and are in interference fit with each other; the outer diameters of the plurality of shaft core matching surfaces are gradually reduced in the sleeving direction of the expansion sleeve and the mounting section and are distributed in a stepped manner, and the inner diameters of the plurality of expansion sleeve matching surfaces are gradually reduced in the sleeving direction of the expansion sleeve and the mounting section and are distributed in a stepped manner; according to the main shaft built-in motor, the dismounting difficulty of the rotor is reduced, the expansion sleeve and the shaft core are convenient to mount, interference fit between the expansion sleeve and the shaft core is realized, the rotor and the expansion sleeve are convenient to dismount from the shaft core integrally, and the problem that the rotor in the existing main shaft built-in motor is difficult to dismount is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a motor and a machine tool. Background Art

[0002] In existing spindle-mounted motors, the motor rotor of the spindle usually has an interference fit with the shaft core. The higher the motor output torque, the greater the interference required between the motor rotor and the shaft core, and the difficulty of installing and disassembling the motor rotor also increases accordingly. The interference between the motor rotor and the shaft core is achieved through heat mounting. The greater the interference, the higher the heating temperature of the motor rotor. The temperature transmitted to the shaft core during heat mounting increases accordingly. The shaft core is a slender part and is prone to bending and deformation, resulting in the geometric accuracy of the spindle not meeting the standard after installation, which seriously affects the performance of the spindle. The mating surface between the motor rotor and the shaft core is usually a finely machined surface. Disassembling a motor rotor with a large interference will cause scratches on the mating surface of the shaft core, affecting secondary assembly. Summary of the invention

[0003] In view of this, the present invention provides a motor and a machine tool to solve the problem in the prior art that the greater the motor output torque, the higher the interference fit between the motor rotor and the shaft core is required, which makes it difficult to disassemble and assemble the rotor.

[0004] The present invention provides a motor, comprising a rotor, an expansion sleeve and a shaft core, wherein the rotor is formed with a shaft hole, the expansion sleeve is arranged in the shaft hole, and the outer peripheral wall surface of the expansion sleeve is interference fit with the shaft hole; the inner peripheral wall surface of the expansion sleeve forms an expansion sleeve hole, the shaft core comprises a mounting section, and the expansion sleeve hole is sleeved on the mounting section;

[0005] The inner peripheral wall surface of the expansion sleeve is sequentially formed with a plurality of expansion sleeve matching surfaces along the axial direction of the shaft core, and the inner diameters of the plurality of expansion sleeve matching surfaces gradually decrease along the fitting direction of the expansion sleeve and the mounting section and are distributed in a stepped manner;

[0006] The outer peripheral wall surface of the installation section is sequentially formed with a plurality of shaft core matching surfaces along the axial direction of the shaft core, and the outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the expansion sleeve and the installation section and are distributed in a stepped manner;

[0007] The plurality of expansion sleeve matching surfaces and the plurality of shaft core matching surfaces correspond to each other one by one and are interference fit together.

[0008] Further optionally, the outer peripheral wall surface of the installation section forms a shaft core non-matching surface between two adjacent shaft core matching surfaces, and the inner peripheral wall surface of the expansion sleeve forms a expansion sleeve non-matching surface between two adjacent expansion sleeve matching surfaces;

[0009] The shaft core non-matching surface and the expansion sleeve non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding expansion sleeve non-matching surface, and hydraulic oil can be stored in the oil cavity.

[0010] Further optionally, the interference between each of the shaft core fitting surfaces and the corresponding expansion sleeve fitting surface is the same;

[0011] The outer diameter of the shaft core non-matching surface is smaller than the outer diameter of the shaft core matching surface adjacent to the shaft core non-matching surface, and the inner diameter of the expansion sleeve non-matching surface is larger than the inner diameter of the expansion sleeve matching surface adjacent to the expansion sleeve non-matching surface;

[0012] The oil chamber is an annular structure.

[0013] Further optionally, an oil passing groove is formed on the outer peripheral wall surface of the installation section on the shaft core matching surface between two adjacent shaft core non-matching surfaces, or an oil passing groove is formed on the inner peripheral wall surface of the expansion sleeve on the expansion sleeve matching surface between two adjacent expansion sleeve non-matching surfaces; the oil passing groove communicates with two adjacent oil chambers;

[0014] An oil filling hole is formed at the rear end of the expansion sleeve, and the oil filling hole is communicated with the oil cavity near the rear end.

[0015] Further optionally, the outer peripheral wall surface of the expansion sleeve is formed with a first positioning surface, and the first positioning surface is used for axial positioning of the rotor; the inner peripheral wall surface of the expansion sleeve is formed with a suspended surface near the front end of the expansion sleeve, and the suspended surface plays a guiding role;

[0016] The shaft core is formed with a second positioning surface, the second positioning surface is located at the front end of the mounting section, and the second positioning surface is used for axial positioning of the expansion sleeve.

[0017] Further optionally, a plurality of the shaft core matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core, and a shaft core non-matching surface is formed on at least one of the shaft core matching surfaces; a plurality of the expansion sleeve matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core, and an expansion sleeve non-matching surface is formed on at least one of the expansion sleeve matching surfaces;

[0018] The shaft core non-matching surface and the expansion sleeve non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding expansion sleeve non-matching surface, and hydraulic oil can be stored in the oil cavity.

[0019] The present invention further provides a motor, the motor comprising a shaft core and a rotor, the shaft core comprising a mounting section, the rotor being formed with a shaft hole, the shaft hole being sleeved on the mounting section;

[0020] The wall surface of the shaft hole is sequentially formed with a plurality of rotor matching surfaces along the axial direction of the shaft core, and the inner diameters of the plurality of rotor matching surfaces gradually decrease along the fitting direction of the rotor and the mounting section and are distributed in a stepped manner;

[0021] The outer peripheral wall surface of the installation section is sequentially formed with a plurality of shaft core matching surfaces along the axial direction of the shaft core, and the outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the rotor and the installation section and are distributed in a stepped manner;

[0022] The multiple rotor matching surfaces and the multiple shaft core matching surfaces correspond to each other one by one and are interference fit together.

[0023] Further optionally, the outer peripheral wall surface of the mounting section forms a shaft core non-matching surface between two adjacent shaft core matching surfaces, and the hole wall surface of the shaft hole forms a rotor non-matching surface between two adjacent rotor matching surfaces;

[0024] The shaft core non-matching surface and the rotor non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding rotor non-matching surface, and hydraulic oil can be stored in the oil cavity.

[0025] Further optionally, the interference between each of the shaft core matching surfaces and the corresponding rotor matching surface is the same;

[0026] The outer diameter of the shaft core non-matching surface is smaller than the outer diameter of the shaft core matching surface adjacent to the shaft core non-matching surface, and the inner diameter of the rotor non-matching surface is larger than the inner diameter of the rotor matching surface adjacent to the rotor non-matching surface;

[0027] The oil chamber is an annular structure.

[0028] Further optionally, an oil passing groove is formed on the outer peripheral wall surface of the mounting section on the shaft core matching surface between two adjacent shaft core non-matching surfaces, or an oil passing groove is formed on the hole wall surface of the shaft hole on the rotor matching surface between two adjacent rotor non-matching surfaces; the oil passing groove communicates with two adjacent oil chambers;

[0029] An oil filling hole is formed at the rear end of the rotor, and the oil filling hole is communicated with an oil cavity close to the rear end.

[0030] Further optionally, a plurality of the shaft core matching surfaces are sequentially and continuously arranged along the axial direction of the shaft core, and a shaft core non-matching surface is formed on at least one of the shaft core matching surfaces; a plurality of the rotor matching surfaces are sequentially and continuously arranged along the axial direction of the shaft core, and a rotor non-matching surface is formed on at least one of the rotor matching surfaces;

[0031] The shaft core non-matching surface and the rotor non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding rotor non-matching surface, and hydraulic oil can be stored in the oil cavity.

[0032] The present invention also provides a machine tool, comprising the motor described in any one of the above items.

[0033] Compared with the prior art, the beneficial effects of the present invention are mainly:

[0034] The outer peripheral wall surface of the installation section of the shaft core is formed with multiple shaft core matching surfaces, and the inner peripheral wall surface of the expansion sleeve is formed with multiple expansion sleeve matching surfaces; the multiple shaft core matching surfaces and the multiple expansion sleeve matching surfaces correspond to each other one by one and are interference fit together; the outer diameters of the multiple shaft core matching surfaces gradually decrease and are distributed in steps along the fitting direction of the expansion sleeve and the installation section, and the inner diameters of the multiple expansion sleeve matching surfaces gradually decrease and are distributed in steps along the fitting direction of the expansion sleeve and the installation section; the difficulty of disassembly and assembly of the rotor is reduced, the installation of the expansion sleeve and the shaft core is facilitated, and the interference fit between the expansion sleeve and the shaft core is achieved, which makes it easy to disassemble the rotor and the expansion sleeve from the shaft core as a whole, solving the problem of difficulty in disassembly and assembly of the rotor in the existing spindle-built-in motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0036] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0037] Figure 1 A schematic structural diagram of an expansion sleeve embodiment provided by the present invention;

[0038] Figure 2 A schematic diagram of the structure of an embodiment of the shaft core provided by the present invention;

[0039] Figure 3 A schematic diagram of the assembly structure of a rotor, an expansion sleeve and a shaft core embodiment provided by the present invention;

[0040] Figure 4 A schematic structural diagram of another embodiment of an expansion sleeve provided by the present invention;

[0041] Figure 5 A schematic structural diagram of another embodiment of a rotor provided by the present invention;

[0042] In the figure:

[0043] 1- rotor; 111- first rotor mating surface; 112- second rotor mating surface; 113- third rotor mating surface; 121- first rotor non-mating surface; 122- second rotor non-mating surface;

[0044] 2-expansion sleeve; 21-expansion sleeve hole; 221-first expansion sleeve matching surface; 222-second expansion sleeve matching surface; 223-third expansion sleeve matching surface; 231-first expansion sleeve non-matching surface; 232-second expansion sleeve non-matching surface; 24-first positioning surface; 25-suspended surface;

[0045] 3-shaft core; 31-installation section; 321-first shaft core matching surface; 322-second shaft core matching surface; 323-third shaft core matching surface; 331-first shaft core non-matching surface; 332-second shaft core non-matching surface; 34-second positioning surface;

[0046] 41- oil groove; 42- oil filling hole;

[0047] 51 - first oil chamber; 52 - second oil chamber. DETAILED DESCRIPTION

[0048] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0050] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0052] In the existing spindle built-in motor, after the motor rotor is installed on the shaft core by heat-fitting, the shaft core is prone to bending and deformation, resulting in the geometric accuracy of the spindle after installation not meeting the standard, seriously affecting the spindle performance; disassembling the motor rotor with a large interference will cause scratches on the shaft core mating surface, affecting the secondary assembly;

[0053] The present invention creatively provides a motor, comprising a rotor, an expansion sleeve and a shaft core, wherein the rotor is formed with a shaft hole, the expansion sleeve is arranged in the shaft hole, and the outer peripheral wall surface of the expansion sleeve is interference-fitted with the shaft hole; the inner peripheral wall surface of the expansion sleeve is formed with the expansion sleeve hole, the shaft core comprises a mounting section, and the expansion sleeve hole is sleeved on the mounting section; the outer peripheral wall surface of the mounting section is formed with a plurality of shaft core matching surfaces, and the inner peripheral wall surface of the expansion sleeve is formed with a plurality of expansion sleeve matching surfaces; the plurality of shaft core matching surfaces and the plurality of expansion sleeve matching surfaces correspond to each other one by one and are interference-fitted together;

[0054] The outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the expansion sleeve and the installation section, and the inner diameters of the plurality of expansion sleeve matching surfaces gradually decrease along the fitting direction of the expansion sleeve and the installation section;

[0055] The difficulty of disassembling and assembling the rotor is reduced, the installation of the expansion sleeve and the shaft core is facilitated, and an interference fit between the expansion sleeve and the shaft core is achieved, which facilitates the removal of the rotor and the expansion sleeve from the shaft core as a whole.

[0056] Example 1

[0057] like Figures 1 to 3 As shown, this embodiment provides a motor, the motor includes a rotor 1, an expansion sleeve 2 and a shaft core 3, the rotor 1 is formed with a shaft hole, the expansion sleeve 2 is arranged in the shaft hole, and the outer peripheral wall of the expansion sleeve 2 and the shaft hole are interference fit; the inner peripheral wall of the expansion sleeve 2 surrounds the expansion sleeve hole 21, the shaft core 3 includes a mounting section 31, and the expansion sleeve hole 21 is sleeved on the mounting section 31;

[0058] The inner peripheral wall surface of the expansion sleeve 2 is sequentially formed with a plurality of expansion sleeve matching surfaces along the axial direction of the shaft core 3, and the inner diameters of the plurality of expansion sleeve matching surfaces gradually decrease along the fitting direction of the expansion sleeve 2 and the mounting section 31 and are distributed in a stepped manner;

[0059] The outer peripheral wall surface of the installation section 31 is sequentially formed with a plurality of shaft core matching surfaces along the axial direction of the shaft core 3, and the outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the expansion sleeve 2 and the installation section 31 and are distributed in a stepped manner;

[0060] The multiple shaft core 3 mating surfaces and the multiple expansion sleeve mating surfaces correspond to each other one by one and are interference fit together;

[0061] Specifically, the fitting direction of the expansion sleeve 2 and the mounting section 31 is the direction of fitting the expansion sleeve hole 21 on the mounting section 31, so the inner diameters of multiple expansion sleeve fitting surfaces and the outer diameters of multiple shaft core fitting surfaces change in the same regular pattern along the fitting direction of the expansion sleeve 2 and the mounting section 31; the inner diameters of multiple expansion sleeve fitting surfaces are distributed in steps along the fitting direction of the expansion sleeve 2 and the mounting section 31, that is, multiple expansion sleeve fitting surfaces are arranged in sequence or continuously along the axial direction of the shaft core 3; the outer diameters of multiple shaft core fitting surfaces are distributed in steps along the fitting direction of the expansion sleeve 2 and the mounting section 31, that is, multiple shaft core fitting surfaces are arranged in sequence or continuously along the axial direction of the shaft core 3; in this embodiment, multiple expansion sleeve fitting surfaces are arranged in sequence or continuously along the axial direction of the shaft core 3, and multiple shaft core fitting surfaces are arranged in sequence or continuously along the axial direction of the shaft core 3.

[0062] By designing multiple shaft core matching surfaces and multiple expansion sleeve matching surfaces to have one-to-one corresponding interference fit, and the outer diameters of the multiple shaft core matching surfaces and the inner diameters of the multiple expansion sleeve matching surfaces change in the same regularity, the difficulty of installing the expansion sleeve 2 can be reduced; however, it is still difficult to disassemble the expansion sleeve 2, and the specific structure for reducing the difficulty of disassembling the expansion sleeve 2 is described below; the outer peripheral wall surface of the installation section 31 forms a shaft core non-matching surface between two adjacent shaft core matching surfaces, and the inner peripheral wall surface of the expansion sleeve 2 forms an expansion sleeve non-matching surface between two adjacent expansion sleeve matching surfaces;

[0063] The non-matching surface of the shaft core and the non-matching surface of the expansion sleeve are arranged in one-to-one correspondence, and an oil cavity is formed between the non-matching surface of the shaft core and the corresponding non-matching surface of the expansion sleeve, and hydraulic oil can be stored in the oil cavity.

[0064] Preferably, the interference between each shaft core fitting surface and the corresponding expansion sleeve fitting surface is the same;

[0065] The outer diameter of the shaft core non-matching surface is smaller than the outer diameter of the shaft core matching surface adjacent to the shaft core non-matching surface, and the inner diameter of the expansion sleeve non-matching surface is larger than the inner diameter of the expansion sleeve matching surface adjacent to the expansion sleeve non-matching surface;

[0066] The oil chamber is an annular structure.

[0067] Injecting hydraulic oil into the oil cavity can reduce the interference between the expansion sleeve mating surface and the shaft core mating surface, thereby reducing the difficulty of disassembling the expansion sleeve 2. The following is a specific method for how to inject hydraulic oil into each oil cavity; the outer peripheral wall surface of the installation section 31 is formed with an oil groove 41 on the shaft core mating surface between two adjacent shaft core non-mating surfaces, and the oil groove 41 is provided with multiple oil grooves 41, and the multiple oil grooves 41 are evenly distributed along the circumference of the installation section 31; or the inner peripheral wall surface of the expansion sleeve 2 is formed with an oil groove 41 on the expansion sleeve mating surface between two adjacent expansion sleeve non-mating surfaces (see Figure 4 ), a plurality of oil passage grooves 41 are provided, and the plurality of oil passage grooves 41 are evenly distributed along the circumference of the expansion sleeve hole 21; the oil passage grooves 41 communicate with two adjacent oil chambers;

[0068] An oil filling hole 42 is formed at the rear end of the expansion sleeve 2, and the oil filling hole 42 is connected to the oil cavity near the rear end;

[0069] The rotor 1 and the expansion sleeve 2 are assembled and disassembled with the shaft core 3 as a whole. After the rotor 1 and the expansion sleeve 2 are hot-installed into the shaft core 3 as a whole, hydraulic oil is introduced into the oil filling hole 42 to maintain pressure so that the hydraulic oil fills the oil cavity, which can adjust the bending deformation of the shaft core 3. When the rotor 1 and the expansion sleeve 2 are disassembled as a whole, hydraulic oil is introduced to fill the oil cavity, which can reduce the contact stress between the mating surfaces and the friction resistance caused by the large interference, thereby reducing the difficulty of disassembling the rotor 1 and the expansion sleeve 2 as a whole.

[0070] In addition, the present embodiment further proposes that the outer peripheral wall of the expansion sleeve 2 is formed with a first positioning surface 24, and the first positioning surface 24 is used for axial positioning of the rotor 1; the inner peripheral wall of the expansion sleeve 2 is formed with a suspended surface 25 (see Figure 1 and Figure 4 )_, the suspended surface 25 is used to guide the expansion sleeve 2 when the expansion sleeve 2 is installed on the shaft core 3, so as to facilitate the installation of the expansion sleeve 2;

[0071] The shaft core 3 is formed with a second positioning surface 34 . The second positioning surface 34 is located at the front end of the mounting section 31 . The second positioning surface 34 is used for axial positioning of the expansion sleeve 2 .

[0072] Specifically, along the fitting direction of the expansion sleeve 2 and the installation section 31, the multiple shaft core matching surfaces include a first shaft core matching surface 321, a second shaft core matching surface 322 and a third shaft core matching surface 323, the outer diameter of the first shaft core matching surface 321> the outer diameter of the second shaft core matching surface 322> the outer diameter of the third shaft core matching surface 323; a first shaft core non-matching surface 331 is formed between the first shaft core matching surface 321 and the second shaft core matching surface 322, and a second shaft core non-matching surface 332 is formed between the second shaft core matching surface 322 and the third shaft core matching surface 323;

[0073] Along the fitting direction of the expansion sleeve 2 and the mounting section 31, the plurality of expansion sleeve fitting surfaces include a first expansion sleeve fitting surface 221, a second expansion sleeve fitting surface 222 and a third expansion sleeve fitting surface 223, the outer diameter of the first expansion sleeve fitting surface 221>the outer diameter of the second expansion sleeve fitting surface 222>the outer diameter of the third expansion sleeve fitting surface 223; a first expansion sleeve non-fitting surface 231 is formed between the first expansion sleeve fitting surface 221 and the second expansion sleeve fitting surface 222, and a second expansion sleeve non-fitting surface 232 is formed between the second expansion sleeve fitting surface 222 and the third expansion sleeve fitting surface 223;

[0074] The first shaft core matching surface 321 and the first expansion sleeve matching surface 221 are interference fit, the second shaft core matching surface 322 and the second expansion sleeve matching surface 222 are interference fit, and the third shaft core matching surface 323 and the third expansion sleeve matching surface 223 are interference fit; the first shaft core non-matching surface 331 and the first expansion sleeve non-matching surface 231 correspond to form a first oil cavity 51, and the second shaft core non-matching surface 332 and the second expansion sleeve non-matching surface 232 correspond to form a second oil cavity 52;

[0075] The oil filling hole 42 is connected to the second oil chamber 52 , and the first oil chamber 51 and the second oil chamber 52 are connected through the oil groove 41 ; external hydraulic oil can be injected into the second oil chamber 52 through the oil filling hole 42 , and then enter the first oil chamber 51 through the oil groove 41 .

[0076] When the expansion sleeve 2 is assembled onto the shaft core 3, the fitting direction is to the left, and the first expansion sleeve fitting surface 221 first passes through the third shaft core fitting surface 323, then passes through the second shaft core fitting surface 322, and finally passes through the first shaft core fitting surface 321; because the outer diameter of the first shaft core fitting surface 321 is the largest, and the outer diameter of the third shaft core fitting surface 323 is the smallest; such a design allows the expansion sleeve 2 to pass through the third shaft core fitting surface 323 and the second shaft core fitting surface 322 with a gap, so it can pass through easily; similarly, the second expansion sleeve fitting surface 222 passes through the third shaft core fitting surface 323 with a large gap, so it can pass through easily;

[0077] During the entire assembly process, when the first expansion sleeve mating surface 221 contacts the first shaft core mating surface 321, the second expansion sleeve mating surface 222 contacts the second shaft core mating surface 322 at the same time, and the third expansion sleeve mating surface 223 contacts the third shaft core mating surface 323 at the same time; only in this section, each mating surface needs to rely on the small gap generated by the heating of the expansion sleeve 2 to pass; compared with the interference fit of the entire section, this design shortens the length of the assembly section and reduces the difficulty of assembly.

[0078] Specifically, the process of installing the rotor 1 and the expansion sleeve 2 is as follows:

[0079] When installing the rotor 1, first heat-fit the rotor 1 onto the expansion sleeve 2. If the thickness of the expansion sleeve 2 is relatively thin, the rotor 1 can be heat-fitted onto the blank of the expansion sleeve 2, and then the expansion sleeve hole 21 can be processed to prevent deformation. The rotor 1 and the expansion sleeve 2 are heat-fitted onto the shaft core 3 as a whole. Since the diameter of the mating surface that is first contacted during heat fitting is large, the fitting can proceed smoothly even when the interference fit is large. Since the heat-fit expansion sleeve 2 and the shaft core 3 cannot be completely coaxial, the contact stress distribution of the mating surfaces is uneven to a certain extent, which may cause the shaft core 3 to bend in severe cases. After the heat fitting is completed, only one oil filling hole 42 is left open, and the other oil filling holes 42 are closed. Hydraulic oil is injected through the opened oil filling hole 42, and the hydraulic oil enters the second oil chamber 52 and enters the first oil chamber 51 along the oil groove 41. When the two oil chambers are filled with hydraulic oil, the pressure is maintained for a period of time, and then the pressure is relieved for subsequent assembly. The high-pressure oil pressure-maintaining process allows the contact stress between the expansion sleeve mating surface and the shaft core mating surface to have the opportunity to be evenly distributed, which can correct the bending deformation of the shaft core 3 to a certain extent, thereby avoiding the problem of substandard geometric accuracy caused by the bending of the shaft core 3 after installation.

[0080] The process of disassembling rotor 1 and expansion sleeve 2 is as follows:

[0081] When disassembling the rotor 1, only one oil injection hole 42 is left open, and the other oil injection holes 42 are closed. Hydraulic oil is injected through the opened oil injection hole 42. When the hydraulic oil fills the two oil chambers, the rotor 1 and the expansion sleeve 2 are pulled out of the shaft core 3 as a whole using a disassembly tool. Since the hydraulic oil expands the expansion sleeve 2, the contact stress between the expansion sleeve mating surface and the shaft core mating surface is reduced, and the friction resistance to be overcome in disassembling the expansion sleeve 2 is reduced accordingly; at the same time, when disassembling, as the mating surface with a smaller inner diameter of the expansion sleeve 2 is disengaged first, the mating surface with a larger inner diameter of the expansion sleeve 2 is easier to disengage from the direction in which the outer diameter of the mating surface of the shaft core 3 is reduced, further reducing the difficulty of disassembly.

[0082] Example 2

[0083] Different from the first embodiment, a plurality of shaft core matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core 3, and a shaft core non-matching surface is formed on at least one shaft core matching surface; a plurality of expansion sleeve matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core 3, and an expansion sleeve non-matching surface is formed on at least one expansion sleeve matching surface;

[0084] The non-matching surface of the shaft core and the non-matching surface of the expansion sleeve are arranged in one-to-one correspondence, and an oil cavity is formed between the non-matching surface of the shaft core and the corresponding non-matching surface of the expansion sleeve, and hydraulic oil can be stored in the oil cavity.

[0085] Injecting hydraulic oil into the oil cavity can reduce the interference between the expansion sleeve mating surface and the shaft core mating surface, thereby reducing the difficulty of disassembling the expansion sleeve 2. The following is a description of the specific method of how to inject hydraulic oil into each oil cavity; an oil groove 41 is formed between two adjacent non-matching surfaces of the shaft core on the outer peripheral wall of the installation section 31, and a plurality of oil grooves 41 are provided, and the plurality of oil grooves 41 are evenly distributed along the circumference of the installation section 31; or an oil groove 41 is formed between two adjacent non-matching surfaces of the expansion sleeve on the inner peripheral wall of the expansion sleeve 2, and a plurality of oil grooves 41 are provided, and the plurality of oil grooves 41 are evenly distributed along the circumference of the expansion sleeve hole 21; the oil groove 41 connects two adjacent oil cavities;

[0086] An oil filling hole 42 is formed at the rear end of the expansion sleeve 2, and the oil filling hole 42 is connected to the oil cavity near the rear end;

[0087] The rotor 1 and the expansion sleeve 2 are assembled and disassembled with the shaft core 3 as a whole. After the rotor 1 and the expansion sleeve 2 are hot-installed into the shaft core 3 as a whole, hydraulic oil is introduced into the oil filling hole 42 to maintain pressure so that the hydraulic oil fills the oil cavity, which can adjust the bending deformation of the shaft core 3. When the rotor 1 and the expansion sleeve 2 are disassembled as a whole, hydraulic oil is introduced to fill the oil cavity, which can reduce the contact stress between the mating surfaces and the friction resistance caused by the large interference, thereby reducing the difficulty of disassembling the rotor 1 and the expansion sleeve 2 as a whole.

[0088] Example 3

[0089] like Figure 4 and Figure 5 As shown, this embodiment provides a motor, the motor includes a shaft core 3 and a rotor 1, the shaft core 3 includes a mounting section 31, the rotor 1 is formed with a shaft hole, and the shaft hole is sleeved on the mounting section 31;

[0090] The wall surface of the shaft hole is sequentially formed with a plurality of rotor matching surfaces along the axial direction of the shaft core 3, and the inner diameters of the plurality of rotor matching surfaces gradually decrease along the fitting direction of the rotor 1 and the mounting section 31 and are distributed in a stepped manner;

[0091] The outer peripheral wall surface of the installation section 31 is sequentially formed with a plurality of shaft core matching surfaces along the axial direction of the shaft core 3, and the outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the rotor 1 and the installation section 31 and are distributed in a stepped manner;

[0092] The multiple rotor mating surfaces and the multiple shaft core mating surfaces correspond to each other one by one and are interference fit together, and the rotor 1 also serves as the expansion sleeve 2.

[0093] By designing multiple shaft core matching surfaces and multiple rotor matching surfaces to have one-to-one corresponding interference fit, and the outer diameters of the multiple shaft core matching surfaces and the inner diameters of the multiple rotor matching surfaces change in the same regularity, the difficulty of installing the rotor 1 can be reduced; however, it is still difficult to disassemble the rotor 1, and the specific structure for reducing the difficulty of disassembling the rotor 1 is described below; the outer peripheral wall surface of the installation section 31 forms a shaft core non-matching surface between two adjacent shaft core matching surfaces, and the hole wall surface of the shaft hole forms a rotor non-matching surface between two adjacent rotor matching surfaces;

[0094] The shaft core non-matching surface and the rotor non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding rotor non-matching surface, and hydraulic oil can be stored in the oil cavity.

[0095] Preferably, the interference between each shaft core mating surface and the corresponding rotor mating surface is the same;

[0096] The outer diameter of the shaft core non-matching surface is smaller than the outer diameter of the shaft core matching surface adjacent to the shaft core non-matching surface, and the inner diameter of the rotor non-matching surface is larger than the inner diameter of the rotor matching surface adjacent to the rotor non-matching surface;

[0097] The oil chamber is an annular structure.

[0098] Injecting hydraulic oil into the oil cavity can reduce the interference between the rotor mating surface and the shaft core mating surface, thereby reducing the difficulty of disassembling the rotor 1. The specific direction of how to inject hydraulic oil into each oil cavity is described below; the outer peripheral wall surface of the installation section 31 is formed with an oil groove 41 on the shaft core mating surface between two adjacent shaft core non-mating surfaces, or the hole wall surface of the shaft hole is formed with an oil groove 41 on the rotor mating surface between two adjacent rotor non-mating surfaces; the oil groove 41 connects two adjacent oil cavities;

[0099] An oil filling hole 42 is formed at the rear end of the rotor 1, and the oil filling hole 42 is communicated with an oil chamber near the rear end.

[0100] Example 4

[0101] Different from the third embodiment, a plurality of shaft core matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core 3, and a shaft core non-matching surface is formed on at least one shaft core matching surface; a plurality of rotor matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core 3, and a rotor non-matching surface is formed on at least one rotor matching surface;

[0102] The shaft core non-matching surface and the rotor non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding rotor non-matching surface, and hydraulic oil can be stored in the oil cavity.

[0103] Injecting hydraulic oil into the oil cavity can reduce the interference between the rotor mating surface and the shaft core mating surface, thereby reducing the difficulty of disassembling the rotor 1. The specific method of how to inject hydraulic oil into each oil cavity is described below; an oil groove 41 is formed on the outer peripheral wall surface of the installation section 31 between two adjacent non-mating surfaces of the shaft core, or an oil groove 41 is formed on the hole wall surface of the shaft hole between two adjacent non-mating surfaces of the rotor; the oil groove 41 connects two adjacent oil cavities.

[0104] Example 5

[0105] This embodiment provides a machine tool, comprising the motor described in any one of Embodiments 1 and 4.

[0106] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A motor, characterized in that: The motor comprises a rotor, an expansion sleeve and a shaft core, wherein the rotor is formed with a shaft hole, the expansion sleeve is arranged in the shaft hole, and the outer peripheral wall surface of the expansion sleeve is interference fit with the shaft hole; the inner peripheral wall surface of the expansion sleeve forms an expansion sleeve hole, the shaft core comprises a mounting section, and the expansion sleeve hole is sleeved on the mounting section; The inner peripheral wall surface of the expansion sleeve is sequentially formed with a plurality of expansion sleeve matching surfaces along the axial direction of the shaft core, and the inner diameters of the plurality of expansion sleeve matching surfaces gradually decrease along the fitting direction of the expansion sleeve and the mounting section and are distributed in a stepped manner; The outer peripheral wall surface of the installation section is sequentially formed with a plurality of shaft core matching surfaces along the axial direction of the shaft core, and the outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the expansion sleeve and the installation section and are distributed in a stepped manner; The plurality of expansion sleeve matching surfaces and the plurality of shaft core matching surfaces correspond to each other one by one and are interference fit together.

2. The motor according to claim 1, characterized in that The outer peripheral wall surface of the installation section forms a shaft core non-matching surface between two adjacent shaft core matching surfaces, and the inner peripheral wall surface of the expansion sleeve forms an expansion sleeve non-matching surface between two adjacent expansion sleeve matching surfaces; The shaft core non-matching surface and the expansion sleeve non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding expansion sleeve non-matching surface, and hydraulic oil can be stored in the oil cavity.

3. The motor according to claim 2, characterized in that The interference between each of the shaft core fitting surfaces and the corresponding expansion sleeve fitting surface is the same; The outer diameter of the shaft core non-matching surface is smaller than the outer diameter of the shaft core matching surface adjacent to the shaft core non-matching surface, and the inner diameter of the expansion sleeve non-matching surface is larger than the inner diameter of the expansion sleeve matching surface adjacent to the expansion sleeve non-matching surface; The oil chamber is an annular structure.

4. The motor according to any one of claims 2 to 3, characterized in that: The outer peripheral wall surface of the installation section is formed with an oil passing groove on the shaft core matching surface between two adjacent shaft core non-matching surfaces, or the inner peripheral wall surface of the expansion sleeve is formed with an oil passing groove on the expansion sleeve matching surface between two adjacent expansion sleeve non-matching surfaces; the oil passing groove communicates with two adjacent oil chambers; An oil filling hole is formed at the rear end of the expansion sleeve, and the oil filling hole is communicated with the oil cavity near the rear end.

5. The motor according to claim 4, characterized in that The outer peripheral wall surface of the expansion sleeve is formed with a first positioning surface, and the first positioning surface is used for axial positioning of the rotor; the inner peripheral wall surface of the expansion sleeve is formed with a suspended surface near the front end of the expansion sleeve, and the suspended surface plays a guiding role; The shaft core is formed with a second positioning surface, the second positioning surface is located at the front end of the mounting section, and the second positioning surface is used for axial positioning of the expansion sleeve.

6. The motor according to claim 1, characterized in that A plurality of shaft core matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core, and a shaft core non-matching surface is formed on at least one shaft core matching surface; a plurality of expansion sleeve matching surfaces are sequentially arranged in a continuous sequence along the axis direction of the shaft core, and an expansion sleeve non-matching surface is formed on at least one expansion sleeve matching surface; The shaft core non-matching surface and the expansion sleeve non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding expansion sleeve non-matching surface, and hydraulic oil can be stored in the oil cavity.

7. A motor, characterized in that: The motor comprises a shaft core and a rotor, the shaft core comprises a mounting section, the rotor is formed with a shaft hole, and the shaft hole is sleeved on the mounting section; The wall surface of the shaft hole is sequentially formed with a plurality of rotor matching surfaces along the axial direction of the shaft core, and the inner diameters of the plurality of rotor matching surfaces gradually decrease along the fitting direction of the rotor and the mounting section and are distributed in a stepped manner; The outer peripheral wall surface of the installation section is sequentially formed with a plurality of shaft core matching surfaces along the axial direction of the shaft core, and the outer diameters of the plurality of shaft core matching surfaces gradually decrease along the fitting direction of the rotor and the installation section and are distributed in a stepped manner; The multiple rotor matching surfaces and the multiple shaft core matching surfaces correspond to each other one by one and are interference fit together.

8. The motor according to claim 7, characterized in that The outer peripheral wall surface of the installation section forms a shaft core non-matching surface between two adjacent shaft core matching surfaces, and the hole wall surface of the shaft hole forms a rotor non-matching surface between two adjacent rotor matching surfaces; The shaft core non-matching surface and the rotor non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding rotor non-matching surface, and hydraulic oil can be stored in the oil cavity.

9. The motor according to claim 8, characterized in that The interference between each shaft core matching surface and the corresponding rotor matching surface is the same; The outer diameter of the shaft core non-matching surface is smaller than the outer diameter of the shaft core matching surface adjacent to the shaft core non-matching surface, and the inner diameter of the rotor non-matching surface is larger than the inner diameter of the rotor matching surface adjacent to the rotor non-matching surface; The oil chamber is an annular structure.

10. The motor according to claim 8, characterized in that The outer peripheral wall surface of the mounting section is provided with an oil passing groove on the shaft core matching surface between two adjacent shaft core non-matching surfaces, or the hole wall surface of the shaft hole is provided with an oil passing groove on the rotor matching surface between two adjacent rotor non-matching surfaces; the oil passing groove communicates with two adjacent oil chambers; An oil filling hole is formed at the rear end of the rotor, and the oil filling hole is communicated with an oil cavity close to the rear end.

11. The motor according to claim 7, characterized in that The plurality of shaft core matching surfaces are sequentially and continuously arranged along the axis direction of the shaft core, and a shaft core non-matching surface is formed on at least one of the shaft core matching surfaces; the plurality of rotor matching surfaces are sequentially and continuously arranged along the axis direction of the shaft core, and a rotor non-matching surface is formed on at least one of the rotor matching surfaces; The shaft core non-matching surface and the rotor non-matching surface are arranged in one-to-one correspondence, and an oil cavity is formed between the shaft core non-matching surface and the corresponding rotor non-matching surface, and hydraulic oil can be stored in the oil cavity.

12. A machine tool, characterized in that: The machine tool comprises the motor according to any one of claims 1 to 11.

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