A bearing seat, an electric spindle assembly and a numerical control machine tool

Abstract

The application provides a bearing seat, an electric spindle assembly and a numerical control machine tool. The bearing seat comprises an outer seat body, an inner seat body, a damping structure and a cooling channel. The outer seat body forms an outer chamber, and the inner seat body is arranged in the outer chamber. A damping cavity is formed between the inner seat body and the outer seat body, and the damping structure is arranged in the damping cavity. The cooling channel is formed in the outer seat body, the inner seat body or the damping structure. The cooling effect and the damping effect are considered, the damping structure improves the support damping between the inner seat body and the outer seat body, and the vibration between the inner seat body and the outer seat body can be absorbed. The cooling liquid is introduced into the cooling channel, the heat generated by the high-speed rotation of the bearing can be taken away, the thermal deformation of the bearing and the bearing seat is prevented, the rotation accuracy of the electric spindle and the stability of the electric spindle operation are improved. The damping structure is formed by injecting a hot-melt glue type material into the damping cavity and solidifying, and the pressure of the damping cavity is not adjustable. The damping structure is formed by injecting metal powder, silicon oil or hydraulic oil into the damping cavity, and the pressure of the damping cavity is adjustable.

Description

Technical Field

[0001] This invention belongs to the field of intelligent equipment technology, and particularly relates to a bearing housing, an electric spindle assembly, and a CNC machine tool. Background Technology

[0002] As a core component of modern CNC machine tools, the electric spindle integrates the motor rotor directly as the machine tool spindle, with the spindle unit housing serving as the motor base, along with other components, to achieve seamless integration of the motor and the machine tool spindle. In actual high-speed cutting processes, the electric spindle speed can typically reach 20,000-30,000 revolutions per minute, or even higher. The spindle generally uses paired ceramic ball angular contact bearings for support. During high-speed rotation, the bearings generate a large amount of heat. If not cooled promptly, the electric spindle will undergo thermal deformation, affecting its rotational accuracy. Furthermore, the vibrations generated during high-speed operation directly impact the machining accuracy of the part's surface.

[0003] Existing electric spindles typically use a single bearing housing to fix and support the bearing. The outer wall of the bearing housing has a cooling groove, and coolant is introduced into the cooling groove to cool the bearing. However, the damping effect of a single bearing housing is low and the vibration reduction effect is poor. Some have proposed a bearing with a spring and a damping layer, which can achieve a vibration reduction effect. However, in this solution, the bearing installation accuracy is low, the rotation accuracy of the electric spindle is poor, and there is no cooling for the bearing. Summary of the Invention

[0004] In view of this, the present invention provides a bearing housing, an electric spindle assembly, and a CNC machine tool to solve the problems of existing bearing housings being unable to simultaneously cool and damp the bearing, and having complex damping structures and limited damping effects.

[0005] This invention provides a bearing housing, comprising:

[0006] The outer seat body has an outer chamber.

[0007] An inner seat body is disposed within the outer seat body and the inner seat body forms an inner chamber for housing a bearing; a vibration damping cavity is formed between the inner seat body and the outer seat body;

[0008] A vibration damping structure is disposed within the vibration damping cavity;

[0009] Cooling channels are formed in the outer seat and / or inner seat and / or vibration damping structure.

[0010] Alternatively, the vibration damping structure may include a cooling pipe forming the cooling channel.

[0011] Further optionally, the outer seat body has an inlet channel and an outlet channel that are arranged opposite to each other; the inlet end of the cooling channel is connected to the inlet channel, and the outlet end of the cooling channel is connected to the outlet channel.

[0012] Alternatively, the inner seat is provided with a cooling pipe and the inner seat is made of sintered metal powder; the cooling pipe forms the cooling channel.

[0013] Further optionally, the outer base body is formed with an inlet flow channel and an outlet flow channel disposed opposite to each other; the vibration damping structure is formed with an inlet through hole and an outlet through hole;

[0014] The inlet end of the cooling channel is connected to the inlet flow channel through the inlet through hole, and the outlet end of the cooling channel is connected to the outlet flow channel through the outlet through hole.

[0015] Alternatively, the cooling pipe is wound around the inner seat in a spiral shape, and the axial direction of the spiral shape is consistent with the axial direction of the inner seat.

[0016] Further optionally, the vibration damping structure is formed by injecting and curing a hot melt adhesive material into the vibration damping cavity, and the pressure of the vibration damping cavity is not adjustable; or,

[0017] The vibration damping structure is formed by injecting metal powder, silicone oil, or hydraulic oil into the vibration damping cavity, and the pressure of the vibration damping cavity is adjustable.

[0018] Further optionally, when the pressure of the damping cavity is adjustable, a first sealing ring is provided between one end of the outer side wall of the inner seat and the inner side wall of the outer chamber, and a second sealing ring is provided between the other end of the outer side wall of the inner seat and the inner side wall of the outer chamber.

[0019] Optionally, when the pressure of the damping cavity is adjustable, the outer seat body has an injection hole communicating with the damping cavity; metal powder, silicone oil, or hydraulic oil is injected into the damping cavity through the injection hole.

[0020] A pressure regulating mechanism is provided inside the injection hole, which can be used to adjust the pressure of the vibration damping chamber.

[0021] Optionally, the pressure regulating mechanism includes a sealing column and a pressure regulating component. The sealing column is slidably disposed within the injection hole and close to the vibration damping cavity; the pressure regulating component is drively connected to the sealing column and disposed away from the vibration damping cavity.

[0022] By controlling the movement of the pressure regulating component, the sealing column slides along the axial direction of the injection hole, thereby adjusting the pressure of the vibration damping chamber.

[0023] Alternatively, the pressure regulating element may be a screw.

[0024] Further optionally, the injection hole includes a first shaft segment and a second shaft segment; one end of the first shaft segment is connected to the vibration damping cavity, and the other end of the first shaft segment is connected to the second shaft segment; the first shaft segment includes a necking structure;

[0025] The second shaft segment is provided with the sealing column, and a third sealing ring is provided between the second shaft segment and the sealing column.

[0026] Optionally, the injection hole further includes a third shaft segment, one end of which is connected to the second shaft segment, and the other end of which is connected to the outside; the third shaft segment is provided with the pressure regulating element.

[0027] The present invention also provides an electric spindle assembly, including an electric spindle, a bearing, and a bearing housing as described in any of the above claims; the bearing housing is sleeved on the outer periphery of the electric spindle and is connected to the electric spindle via the bearing.

[0028] The present invention also provides a CNC machine tool, including a machine tool body, wherein the machine tool body is provided with a bearing seat as described in any one of the above claims or an electric spindle assembly as described in the above claims.

[0029] Compared with the prior art, the main advantages of the present invention are as follows:

[0030] (1) Taking into account both cooling and vibration reduction effects, a vibration reduction cavity is formed between the inner and outer seats, and a vibration reduction structure is set in the vibration reduction cavity to improve the support damping between the inner and outer seats and absorb the vibration between the inner and outer seats; a cooling channel is formed in the outer seat and / or the inner seat and / or the vibration reduction structure, and coolant is introduced into the cooling channel to remove the heat generated by the high-speed rotation of the bearing, prevent the bearing and bearing seat from thermal deformation, improve the rotation accuracy of the electric spindle, and thus improve the machining accuracy; the vibration reduction structure absorbs the vibration of the bearing and converts the vibration energy into heat energy, and the heat energy can be carried away by the coolant.

[0031] (2) The vibration damping structure is formed by injecting hot melt adhesive material into the vibration damping cavity and curing it. The pressure of the vibration damping cavity cannot be adjusted, which can absorb vibration and improve the connection stiffness between the outer seat and the inner seat. The vibration damping structure is formed by injecting metal powder, silicone oil or hydraulic oil into the vibration damping cavity. It can absorb vibration and the pressure of the vibration damping cavity can be adjusted according to the actual vibration amplitude, which improves the vibration damping effect and support stiffness.

[0032] (3) Cooling pipes are embedded in the vibration damping structure, forming a cooling channel; or, cooling pipes are embedded in the inner seat and the inner seat is made of metal powder sintering; coolant is introduced into the cooling pipes to cool the bearings, resulting in a short heat dissipation path and good cooling effect; the structure is simple, effectively reducing the vibration of the bearings, improving the stability of the electric spindle operation, extending the life of the electric spindle, and ensuring the reliable operation of the electric spindle; it solves the problems of complex bearing seat structure, poor heat dissipation effect and insignificant vibration damping effect in the existing bearing seats.

[0033] (4) The cooling pipe is wound around the circumference of the inner seat to form a spiral structure, which increases the contact area between the cooling pipe and the vibration damping structure or the inner seat, and improves the heat dissipation effect of the bearing; a first sealing ring and a second sealing ring are provided between the outer side wall of the inner seat and the inner side wall of the outer chamber to ensure the sealing of the vibration damping cavity and improve the vibration damping effect of the vibration damping structure.

[0034] (5) The outer seat has an injection hole that communicates with the damping cavity. Metal powder, silicone oil or hydraulic oil is injected into the damping cavity through the injection hole. By controlling the movement of the pressure regulating component, the sealing column slides along the axial direction of the injection hole, thereby adjusting the pressure of the damping cavity, which can achieve different damping effects and different support stiffness. Attached Figure Description

[0035] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0036] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0037] Figure 1 This is a schematic diagram of the structure of the bearing housing embodiment 1 provided by the present invention;

[0038] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0039] Figure 3 This is a schematic diagram of the structure of embodiment 2 of the bearing housing provided by the present invention;

[0040] Figure 4a and Figure 4bThis is a schematic diagram of the structure of embodiment 2 of the electric spindle assembly provided by the present invention;

[0041] Figure 5 A schematic diagram of the structure of a cooling pipe embodiment provided by the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of embodiment 3 of the bearing housing provided by the present invention;

[0043] Figure 7 for Figure 6 Enlarged view at point B in the middle;

[0044] Figure 8 This is a schematic diagram of the structure of embodiment 3 of the inner seat provided by the present invention;

[0045] Figure 9 This is a schematic diagram of the structure of embodiment 3 of the electric spindle assembly provided by the present invention;

[0046] Figure 10 This is a schematic diagram of the structure of embodiment 4 of the electric spindle assembly provided by the present invention;

[0047] In the picture:

[0048] 1-Outer seat; 11-Outer chamber; 12-Inlet channel; 13-Outlet channel; 14-Injection hole; 141-First shaft section; 142-Second shaft section; 143-Third shaft section;

[0049] 2-Inner seat; 21-Inner chamber;

[0050] 3-Vibration damping structure; 31-Liquid inlet hole; 32-Liquid outlet hole;

[0051] 4-Cooling pipe; 41-Cooling channel; 411-Inlet end of cooling channel; 412-Outlet end of cooling channel;

[0052] 51 - First sealing ring; 52 - Second sealing ring; 53 - Third sealing ring;

[0053] 6-Pressure regulating mechanism; 61-Sealing column; 62-Pressure regulating component;

[0054] 71-Electric spindle; 72-Bearing. Detailed Implementation

[0055] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0057] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0058] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0059] Existing electric spindles typically use a single bearing housing to fix and support the bearing. The outer wall of the bearing housing has a cooling groove, and coolant is introduced into the cooling groove to cool the bearing. However, the damping effect of a single bearing housing is low and the vibration reduction effect is poor. Some people have proposed a bearing with a spring and a damping layer, which can achieve a vibration reduction effect. However, in this solution, the bearing installation accuracy is low, the rotation accuracy of the electric spindle is poor, and there is no cooling for the bearing.

[0060] The present invention creatively provides a bearing housing, including an outer housing body, an inner housing body, a vibration damping structure, and a cooling channel; the outer housing body forms an outer chamber, the inner housing body is disposed in the outer chamber and also forms an inner chamber; a vibration damping cavity is formed between the inner housing body and the outer housing body, and the vibration damping structure is disposed in the vibration damping cavity; the cooling channel is formed in the outer housing body and / or the inner housing body and / or the vibration damping structure;

[0061] Balancing cooling and vibration reduction, the vibration reduction structure enhances the support damping between the inner and outer housings, absorbing vibrations between them. Coolant is introduced into the cooling channel to remove heat generated by the high-speed rotation of the bearing, preventing thermal deformation of the bearing and bearing housing, improving the rotational accuracy and operational stability of the electric spindle, and thus enhancing machining accuracy.

[0062] Example 1

[0063] <Bearing housing>

[0064] like Figure 1 and Figure 2 As shown, this embodiment provides a bearing housing, including an outer housing 1, an inner housing 2, a vibration damping structure 3, and a cooling channel 41: the outer housing 1 forms an outer chamber 11, the inner housing 2 is disposed in the outer chamber 11 and forms an inner chamber 21, and a bearing 72 can be disposed in the inner chamber 21 for fixing the bearing 72; a vibration damping cavity is formed between the inner housing 2 and the outer housing 1, and a vibration damping structure 3 is disposed in the vibration damping cavity. The vibration damping structure 3 can absorb the vibration between the outer housing 1 and the inner housing 2, and improve the support damping between the inner housing 2 and the outer housing 1; the cooling channel 41 is formed in the vibration damping structure 3, and coolant is introduced into the cooling channel 41 to remove the heat generated by the high-speed rotation of the bearing 72, prevent the bearing 72 and the bearing housing from thermal deformation, improve the rotational accuracy of the electric spindle 71, and thus improve the machining accuracy;

[0065] The simple structure allows the bearing housing to achieve both cooling and vibration reduction, effectively mitigating the vibration of the bearing 72 and improving the connection stiffness between the bearing 72 and the bearing housing. When this bearing housing is applied to the electric spindle 71, it can improve the operational stability of the electric spindle 71, extend the service life of the electric spindle 71, and ensure the reliable operation of the electric spindle 71. It solves the problems of existing bearing housings, such as complex structure, poor heat dissipation, and insignificant vibration reduction.

[0066] Furthermore, such as Figure 5 As shown, the vibration damping structure 3 can directly form a cooling channel 41, or the vibration damping structure 3 can be provided with a cooling pipe 4, which forms a cooling channel 41; preferably, the vibration damping structure 3 is provided with a cooling pipe 4.

[0067] The outer base 1 has an inlet channel 12 and an outlet channel 13 that are arranged opposite to each other; the inlet end 411 of the cooling channel is connected to the inlet channel 12, and the outlet end 412 of the cooling channel is connected to the outlet channel 13.

[0068] The coolant enters the cooling channel 41 through the inlet channel 12 and is discharged through the outlet channel 13. When the coolant flows through the cooling channel 41, it can exchange heat with the vibration damping structure 3, thereby carrying away the heat generated by the high-speed rotation of the bearing 72. The heat dissipation path is short and the cooling effect is good. Different coolants can be selected according to actual needs to achieve different cooling effects.

[0069] Preferably, the cooling pipe 4 is wound around the inner seat 2 in a spiral shape, and the axial direction of the spiral shape is consistent with the axial direction of the inner seat 2, which increases the contact area between the cooling pipe 4 and the vibration damping structure 3 and improves the heat dissipation effect of the bearing 72.

[0070] To address the problem that the vibration damping structure 3 cannot be adapted to different vibration damping needs due to the non-adjustable pressure of the vibration damping cavity, this embodiment proposes that the vibration damping structure 3 is formed by injecting metal powder, silicone oil, or hydraulic oil into the vibration damping cavity, and the pressure of the vibration damping cavity is adjustable, so that the actual vibration damping needs are matched with the pressure of the vibration damping cavity, thereby improving the vibration damping effect and support stiffness.

[0071] When the vibration amplitude of bearing 72 is large, by injecting metal powder, silicone oil, or hydraulic oil into the vibration damping cavity, the pressure of the vibration damping cavity is appropriately reduced, so that the vibration damping structure 3 has a certain vibration damping capacity, which can absorb the vibration of bearing 72 without transmitting the vibration to the outer housing 1, thereby reducing the noise generated by the vibration of bearing 72 and reducing the damage to the bearing housing structure caused by the vibration of bearing 72; making the vibration damping structure 3 have a certain fluidity is beneficial to the heat exchange between the vibration damping structure 3 and the cooling channel 41, thereby improving the heat dissipation effect of the bearing housing;

[0072] When the vibration amplitude of bearing 72 is small, by injecting metal powder, silicone oil, or hydraulic oil into the damping cavity, the pressure of the damping cavity is appropriately increased, so that the damping structure 3 has a certain damping capacity and rigidity at the same time, which can absorb the vibration of bearing 72, improve the stability of bearing 72 operation, and ensure the rotation accuracy of electric spindle 71.

[0073] In response to the problem that the damping structure 3 is prone to leakage and functional failure when the pressure of the damping cavity is adjustable, this embodiment proposes that when the pressure of the damping cavity is adjustable, a first sealing ring 51 is provided between one end of the outer side wall of the inner seat 2 and the inner side wall of the outer chamber 11, and a second sealing ring 52 is provided between the other end of the outer side wall of the inner seat 2 and the inner side wall of the outer chamber 11.

[0074] The vibration damping structure 3 is sealed between the first sealing ring 51 and the second sealing ring 52 to prevent leakage of the vibration damping structure 3, so that the pressure of the vibration damping cavity can be maintained at a certain pressure after the adjustment is completed, ensuring the sealing of the vibration damping cavity and improving the vibration damping effect of the vibration damping structure 3.

[0075] To address the problem of inconvenient pressure adjustment in the vibration damping cavity, this embodiment proposes that when the pressure of the vibration damping cavity is adjustable, the outer seat 1 is provided with an injection hole 14, which connects the outside to the vibration damping cavity; metal powder, silicone oil, or hydraulic oil are injected into the vibration damping cavity through the injection hole 14.

[0076] A pressure regulating mechanism 6 is provided inside the injection hole 14. The pressure of the damping cavity can be adjusted by the pressure regulating mechanism 6. According to actual needs, the pressure of the damping cavity can be adjusted to different values ​​by the pressure regulating mechanism 6 to adapt to different damping needs and different support stiffness, so that the pressure of the damping cavity is matched with the operating conditions of the bearing 72, thereby improving the damping effect and support effect and expanding the application range of the damping structure 3 and the bearing seat.

[0077] Furthermore, the pressure regulating mechanism 6 includes a sealing column 61 and a pressure regulating component 62. The sealing column 61 is slidably disposed in the injection hole 14 and is located close to the vibration damping cavity; the pressure regulating component 62 is drively connected to the sealing column 61 and is located away from the vibration damping cavity.

[0078] By controlling the movement of the pressure regulating component 62, the sealing column 61 slides along the axial direction of the injection hole 14, thereby adjusting the pressure of the damping chamber. When the sealing component slides along the injection hole 14 to different positions, the damping chamber can reach different pressures. When the sealing component slides closer to the damping chamber, the pressure of the damping chamber increases. When the sealing component slides further away from the damping chamber, the pressure of the damping chamber decreases.

[0079] Preferably, the pressure regulating component 62 is a screw; the screw is threadedly connected to the injection hole 14, and rotating the screw changes its position in the injection hole 14, thereby driving the sealing column 61 to move; by controlling the number of rotations of the screw, the sliding displacement of the sealing column 61 can be controlled, thereby adjusting the pressure of the damping cavity to the corresponding value; making the number of rotations of the screw match the target pressure value of the damping cavity, thus improving the accuracy of adjusting the pressure of the damping cavity.

[0080] Specifically, the injection hole 14 includes a first shaft section 141 and a second shaft section 142; one end of the first shaft section 141 is connected to the damping cavity, and the other end of the first shaft section 141 is connected to the second shaft section 142; the first shaft section 141 includes a necking structure, which can play a damping role and prevent the pressure in the damping cavity from changing rapidly when the pressure regulating component 62 is operated, which could cause damage to the inner seat 2 or the outer seat 1.

[0081] A sealing post 61 is provided inside the second shaft section 142, and a third sealing ring 53 is provided between the second shaft section 142 and the sealing post 61 to prevent hydraulic oil or silicone oil from leaking through the injection hole 14.

[0082] The injection hole 14 also includes a third shaft section 143, one end of which is connected to the second shaft section 142, and the other end of which is connected to the outside. The third shaft section 143 is provided with a pressure regulating element 62. Specifically, the third shaft section 143 has an internal thread, and the screw has an external thread. The external thread and the internal thread cooperate to realize the connection between the third shaft section 143 and the screw.

[0083] The installation process for the bearing housing is as follows:

[0084] Connect the liquid inlet end 411 of the cooling channel to the liquid inlet channel 12, and connect the liquid outlet end 412 of the cooling channel to the liquid outlet channel 13.

[0085] A first sealing ring 51 and a second sealing ring 52 are provided between the outer side wall of the inner seat 2 and the inner side wall of the outer chamber 11; the inner seat 2 is placed inside the outer chamber 11 to ensure the sealing of the vibration damping cavity.

[0086] Hydraulic oil, viscous silicone oil, or metal powder are injected into the damping cavity through the injection hole 14. A third sealing ring 53 is set on the sealing column 61, and the sealing column 61 is set inside the second shaft section 142. The pressure regulating component 62 is set inside the third shaft section 143.

[0087] Rotate the pressure regulating component 62 to move the sealing column 61 along the axial direction of the injection hole 14, thereby adjusting the pressure of the damping chamber to achieve different support stiffness and damping.

[0088] When this bearing housing is applied to the electric spindle 71, the process of assembling the bearing housing onto the electric spindle 71 is the same as that of a conventional bearing housing.

[0089] <Electric Spindle Assembly>

[0090] This embodiment also provides an electric spindle assembly, including an electric spindle 71, a bearing 72, and a bearing housing as described in any of the above embodiments; the bearing housing is sleeved on the outer periphery of the electric spindle 71 and connected to the electric spindle 71 through the bearing 72.

[0091] CNC Machine Tools

[0092] This embodiment also provides a CNC machine tool, including a machine tool body, on which a bearing seat or an electric spindle assembly as described above is provided.

[0093] Example 2

[0094] <Bearing housing>

[0095] like Figure 3 As shown, unlike Embodiment 1, the vibration damping structure 3 is formed by injecting a hot melt adhesive material into the vibration damping cavity and curing it, and the pressure of the vibration damping cavity cannot be adjusted; it can absorb vibration and at the same time improve the connection stiffness between the outer seat 1 and the inner seat 2; it improves the stability of the bearing 72 operation, improves the rotational accuracy of the electric spindle 71, and ensures the reliable operation of the electric spindle 71; it solves the problem that the low stiffness of the vibration damping structure 3 leads to the unstable operation of the bearing 72 and the low machining accuracy of the electric spindle 71.

[0096] Preferably, the hot melt adhesive material is epoxy resin.

[0097] The installation process for the bearing housing is as follows:

[0098] Connect the liquid inlet end 411 of the cooling channel to the liquid inlet channel 12, and connect the liquid outlet end 412 of the cooling channel to the liquid outlet channel 13.

[0099] The inner seat 2 is placed inside the outer chamber 11, and the two are fitted with a small clearance fit.

[0100] Hot melt adhesive material is injected into the vibration damping cavity through injection hole 14 until the hot melt adhesive material cures.

[0101] When this bearing housing is applied to the electric spindle 71, the process of assembling the bearing housing onto the electric spindle 71 is the same as that of a conventional bearing housing.

[0102] <Electric Spindle Assembly>

[0103] like Figure 4a and Figure 4b As shown, this embodiment also provides an electric spindle assembly, including an electric spindle 71, a bearing 72, and a bearing housing as described in any of the above. The bearing housing is sleeved on the outer periphery of the electric spindle 71 and is connected to the electric spindle 71 through the bearing 72.

[0104] Example 3

[0105] <Bearing housing>

[0106] like Figure 6 , Figure 7 and Figure 8 As shown, unlike Embodiment 1, the inner seat 2 can directly form a cooling channel 41, or the inner seat 2 can be provided with a cooling pipe 4 and the inner seat 2 can be sintered from metal powder, with the cooling pipe 4 forming a cooling channel 41; specifically, the inner seat 2 is a powder metallurgy part, and the cooling pipe 4 is pre-embedded in the metal powder for sintering during manufacturing, so that the inner seat 2 and the cooling pipe 4 form an integral whole.

[0107] The outer base 1 has an inlet channel 12 and an outlet channel 13 arranged opposite to each other; the vibration damping structure 3 has an inlet through hole 3131 and an outlet through hole 32; the inlet end 411 of the cooling channel is connected to the inlet channel 12 through the inlet through hole 3131, and the outlet end 412 of the cooling channel is connected to the outlet channel 13 through the outlet through hole 32.

[0108] The coolant enters the cooling channel 41 through the inlet channel 12 and the inlet through hole 3131, and is discharged through the outlet through hole 32 and the outlet channel 13. When the coolant flows through the cooling channel 41, it can exchange heat with the inner seat 2, thereby carrying away the heat generated by the high-speed rotation of the bearing 72. The heat dissipation path is short and the cooling effect is good. Different coolants can be selected according to actual needs to achieve different cooling effects.

[0109] Preferably, the cooling pipe 4 is wound around the inner seat 2 in a spiral shape, and the axial direction of the spiral shape is consistent with the axial direction of the inner seat 2, which increases the contact area between the cooling pipe 4 and the inner seat 2 and improves the heat dissipation effect of the bearing 72.

[0110] The installation process for the bearing housing is as follows:

[0111] Metal powder is placed in the mold of the inner seat 2, and the cooling pipe 4 is pre-embedded in the metal powder;

[0112] The metal powder is sintered until the inner seat 2 and the cooling pipe 4 form a single integral part;

[0113] The integral component is installed inside the outer chamber 11;

[0114] The inlet end 411 of the cooling channel is connected to the inlet flow channel 12 through the inlet through hole 3131, and the outlet end 412 of the cooling channel is connected to the outlet flow channel 13 through the outlet through hole 32.

[0115] When this bearing housing is applied to the electric spindle 71, the process of assembling the bearing housing onto the electric spindle 71 is the same as that of a conventional bearing housing.

[0116] <Electric Spindle Assembly>

[0117] like Figure 9 As shown, this embodiment also provides an electric spindle assembly, including an electric spindle 71, a bearing 72, and a bearing housing as described in any of the above. The bearing housing is sleeved on the outer periphery of the electric spindle 71 and is connected to the electric spindle 71 through the bearing 72.

[0118] Example 4

[0119] <Bearing housing>

[0120] Unlike Embodiment 1, a cooling pipe 4 is directly installed inside the vibration damping cavity. The cooling pipe 4 has a certain vibration absorption capacity and stiffness; it can absorb the vibration of the bearing 72, and at the same time improve the stability of the bearing 72 operation and ensure the rotation accuracy of the electric spindle 71. The cooling pipe 4 forms a cooling channel 41, and coolant is introduced into the cooling channel 41 to remove the heat generated by the high-speed rotation of the bearing 72.

[0121] <Electric Spindle Assembly>

[0122] like Figure 10 As shown, this embodiment also provides an electric spindle assembly, including an electric spindle 71, a bearing 72, and a bearing housing as described in any of the above. The bearing housing is sleeved on the outer periphery of the electric spindle 71 and is connected to the electric spindle 71 through the bearing 72.

[0123] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A bearing housing, characterized in that, include: The outer seat (1) has an outer chamber (11); An inner seat (2) is disposed within the outer chamber (11) and the inner seat (2) forms an inner chamber (21) for housing a bearing (72); a damping cavity is formed between the inner seat (2) and the outer seat (1), and the pressure of the damping cavity is adjustable; Vibration damping structure (3) is disposed inside the vibration damping cavity; Cooling channel (41) is formed in the vibration damping structure (3), or in the outer seat (1) and vibration damping structure (3), or in the inner seat (2) and vibration damping structure (3), or in the outer seat (1), vibration damping structure (3) and inner seat (2).

2. The bearing housing according to claim 1, characterized in that, The vibration damping structure (3) is provided with a cooling pipe (4), and the cooling pipe (4) forms the cooling channel (41).

3. The bearing housing according to claim 2, characterized in that, The outer seat (1) has an inlet channel (12) and an outlet channel (13) arranged opposite to each other; the inlet end (411) of the cooling channel is connected to the inlet channel (12), and the outlet end (412) of the cooling channel is connected to the outlet channel (13).

4. The bearing housing according to claim 1, characterized in that, The inner seat (2) is provided with a cooling pipe (4) and the inner seat (2) is made of metal powder sintering; the cooling pipe (4) forms the cooling channel (41).

5. The bearing housing according to claim 4, characterized in that, The outer base (1) has an inlet channel (12) and an outlet channel (13) arranged opposite to each other; the vibration damping structure (3) has an inlet through hole (31) and an outlet through hole (32); The inlet end (411) of the cooling channel is connected to the inlet flow channel (12) through the inlet through hole (31), and the outlet end (412) of the cooling channel is connected to the outlet flow channel (13) through the outlet through hole (32).

6. The bearing housing according to claim 2 or 4, characterized in that, The cooling pipe (4) is wound around the inner seat (2) in a spiral shape, and the axial direction of the spiral shape is consistent with the axial direction of the inner seat (2).

7. The bearing housing according to claim 1, characterized in that, The vibration damping structure (3) is formed by injecting metal powder, silicone oil, or hydraulic oil into the vibration damping cavity.

8. The bearing housing according to claim 7, characterized in that, When the pressure of the damping cavity is adjustable, a first sealing ring (51) is provided between one end of the outer side wall of the inner seat (2) and the inner side wall of the outer chamber (11), and a second sealing ring (52) is provided between the other end of the outer side wall of the inner seat (2) and the inner side wall of the outer chamber (11).

9. The bearing housing according to claim 8, characterized in that, When the pressure of the damping cavity is adjustable, the outer seat (1) is formed with an injection hole (14) communicating with the damping cavity; metal powder, silicone oil or hydraulic oil is injected into the damping cavity through the injection hole (14); A pressure regulating mechanism (6) is provided inside the injection hole (14), and the pressure of the vibration damping cavity can be adjusted by the pressure regulating mechanism (6).

10. The bearing housing according to claim 9, characterized in that, The pressure regulating mechanism (6) includes a sealing column (61) and a pressure regulating component (62). The sealing column (61) is slidably disposed in the injection hole (14) and close to the damping cavity. The pressure regulating component (62) is drivenly connected to the sealing column (61) and disposed away from the damping cavity. By controlling the movement of the pressure regulating component (62), the sealing column (61) slides along the axial direction of the injection hole (14), thereby adjusting the pressure of the damping chamber.

11. The bearing housing according to claim 10, characterized in that, The pressure regulating component (62) is a screw.

12. The bearing housing according to claim 10, characterized in that, The injection hole (14) includes a first shaft segment (141) and a second shaft segment (142); one end of the first shaft segment (141) is connected to the damping cavity, and the other end of the first shaft segment (141) is connected to the second shaft segment (142); the first shaft segment (141) includes a necking structure; The second shaft segment (142) is provided with the sealing post (61), and a third sealing ring (53) is provided between the second shaft segment (142) and the sealing post (61).

13. The bearing housing according to claim 12, characterized in that, The injection hole (14) further includes a third shaft section (143), one end of which is connected to the second shaft section (142), and the other end of which is connected to the outside; the third shaft section (143) is provided with the pressure regulating component (62).

14. An electric spindle assembly, characterized in that, It includes an electric spindle (71), a bearing (72), and a bearing housing as described in any one of claims 1-13; the bearing housing is sleeved on the outer periphery of the electric spindle (71) and connected to the electric spindle (71) through the bearing (72).

15. A CNC machine tool, characterized in that, The machine tool body includes a bearing housing as described in any one of claims 1-13 or an electric spindle assembly as described in claim 14.

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