A noise-reducing reciprocating saw motor

Abstract

This application relates to the technical field of motors, and particularly to a noise-reducing swing saw motor. The motor includes a housing, a stator, a rotor assembly, and a plurality of damping components. The housing includes a front cover and a rear cover. The stator is located between the front cover and the rear cover. The rotor assembly includes a rotor, a first sealed bearing, and a second sealed bearing. The rotor is rotatably connected to the front cover and the rear cover through the first sealed bearing and the second sealed bearing. An air inlet hole with air inlet blades is provided at the center of the rotor. A plurality of damping components are arranged between the outer ring of the first sealed bearing and the front cover for elastically connecting the first sealed bearing and the front cover. The damping component includes a damping cylinder, a piston rod, and an elastic member. The damping component can utilize the air inhaled from the air inlet hole during the rotation of the rotor to form an "air spring" to reduce the vibration of the first sealed bearing and the rotor, thereby reducing the operating noise of the motor. This application has the effect of reducing the operating noise of the swing saw motor and improving its operating stability.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a noise-reducing reciprocating saw motor. Background Art

[0002] Reciprocating saw motors are widely used in the medical and industrial fields. In the medical field, medical reciprocating saws are used for cutting bone tissue in orthopedic surgeries, and have the characteristics of simple operation, stepless speed regulation, forward and reverse rotation selection, etc. In the industrial field, reciprocating saw motors are used for wood processing, stone cutting, etc., and can complete cutting tasks quickly and effectively.

[0003] At present, the noise generated during the operation of ordinary motors mainly has three aspects. One is electromagnetic noise, the second is mechanical noise, and the third is ventilation noise. Electromagnetic noise is mainly caused by the air-gap harmonic magnetic field. The radial alternating magnetic force generated by the interaction of the stator and rotor tooth harmonic magnetic fields will cause periodic dynamic radial deformation of the stator core yoke, and excite the stator to generate electromagnetic noise; mechanical noise is mainly bearing noise and structural component resonance noise, followed by rotational vibration noise; ventilation noise is mainly the noise generated by the periodic impact of the fan blades and rotor blades and other protruding parts on the air when the motor rotates. For reciprocating saw motors, the noise of bearing vibration is one of the main operating noise sources. Due to its structural design and working environment, the rotor of the reciprocating saw motor is more likely to generate vibrations during rotation. These vibrations will cause the contact force between the rolling elements and the raceways inside the bearing to be unstable, and will be transmitted to the motor housing through the bearing, thereby increasing the vibration amplitude of the motor and causing an increase in the operating noise of the motor.

[0004] Therefore, how to reduce the operating noise of the reciprocating saw motor and improve its operating stability is an urgent problem to be solved at present. Summary of the Invention

[0005] In order to reduce the operating noise of the reciprocating saw motor and improve its operating stability, the present application provides a noise-reducing reciprocating saw motor.

[0006] The noise-reducing reciprocating saw motor provided by the present application adopts the following technical solutions:

[0007] A noise-reducing reciprocating saw motor, comprising:

[0008] A housing, the housing includes a front cover and a rear cover arranged opposite to each other;

[0009] A stator, the stator is arranged between the front cover and the rear cover;

[0010] A rotor assembly, the rotor assembly comprising a rotor, a first sealed bearing and a second sealed bearing; the rotor is coaxial with the stator and the rotor is arranged in the stator, and a cooling chamber is formed between the rotor and the stator; the first sealed bearing and the second sealed bearing are respectively sleeved on both ends of the rotor, and the rotor is rotatably connected to the front cover and the rear cover through the first sealed bearing and the second sealed bearing respectively; an air inlet hole is opened at the center of the rotor, and an air inlet blade is arranged in the air inlet hole; the inner side wall of the front cover is sealed and abutted against a side of the first sealed bearing away from the second sealed bearing, and a closed ventilation chamber is formed between the front cover, the rotor and the first sealed bearing, and the ventilation chamber is connected to the air inlet hole;

[0011] A plurality of damping assemblies are circumferentially arranged at equal intervals along the central axis of the rotor between the outer ring of the first sealed bearing and the front cover; the damping assembly comprises a damping cylinder, a piston rod and an elastic member; one end of the damping cylinder is connected to the outer ring of the first sealed bearing, and the other end extends in a direction away from the rotor; one end of the piston rod is connected to the inner wall of the front cover, and the other end is inserted into the damping cylinder and is slidably sealed with the inner wall of the damping cylinder to form a buffer chamber between the piston rod and the damping cylinder; the buffer chamber is connected to the ventilation chamber, and the A pressure relief hole connecting the buffer chamber and the cooling chamber is provided at the bottom of the damping cylinder, and an exhaust hole connecting the cooling chamber and the outside is provided on the rear cover; the elastic member is arranged between the damping cylinder and the piston rod to keep the piston rod away from the damping cylinder; when the rotor rotates, the air inlet blades can press the external air into the buffer chamber through the air inlet hole and the ventilation chamber in turn to form an "air spring" between the piston rod and the damping cylinder, and when the air pressure in the buffer chamber is higher than a preset value, the air can flow out from the pressure relief hole into the cooling chamber and be discharged from the exhaust hole to the outside.

[0012] By adopting the above technical solution, the noise-reducing oscillating saw motor can not only effectively reduce the mechanical noise caused by bearing vibration during operation, but also improve the operating stability and service life. Specifically, the design of the damping cylinder and the piston rod can effectively absorb and reduce the vibration energy generated during the operation of the rotor. When the rotor rotates, the air inlet blades drive the external air into the ventilation cavity and further press it into the buffer cavity, forming an "air spring" between the piston rod and the damping cylinder. This structure can not only reduce the impact force between the rolling elements and raceways inside the bearing, but also reduce the noise propagation path caused by vibration, thereby greatly reducing the noise caused by bearing vibration; in addition, the external air sucked in from the air inlet can not only provide effective cooling for the inside of the rotor, but also the air flowing out of the buffer cavity can further provide additional cooling effect for the outside of the rotor and the stator in the process of flowing through the cooling cavity.

[0013] Optionally, it further includes an eccentric component, which includes an eccentric shaft and a third sealed bearing. The eccentric shaft is connected to one end of the rotor close to the front cover. The third sealed bearing is sleeved on the eccentric shaft, and the outer ring of the third sealed bearing is hermetically abutted and fixed on the inner wall of the front cover to form a sealed ventilation cavity between the front cover, the rotor, the first sealed bearing and the third sealed bearing. An air outlet hole communicating the air inlet hole and the ventilation cavity is provided on the rotor.

[0014] By adopting the above technical solution, the eccentric shaft is directly connected to the rotor, which can effectively achieve the eccentric motion effect required by the pendulum saw. This design not only simplifies the structure, but also improves the transmission efficiency and stability, reduces the noise and vibration caused by the intermediate transmission components, and further reduces the operating noise of the motor. In addition, the ventilation cavity is communicated with the air inlet hole, which can guide the external cold air to enter, so as to effectively take away the heat generated by the first sealed bearing and the third sealed bearing during high-speed operation, and improve the overall stability and service life of the motor.

[0015] Optionally, a communication hole communicating with the buffer cavity is provided on the piston rod, and a communication channel communicating the communication hole and the ventilation cavity is provided on the front cover.

[0016] By adopting the above technical solution, the communication hole on the piston rod and the communication channel on the front cover enable the high-pressure gas in the ventilation cavity to smoothly enter the inner cavity of the damper cylinder. During this process, the flowing gas can also take away the heat on the surfaces of the front cover and the piston rod, playing a cooling role, further improving the overall heat dissipation efficiency of the motor, and reducing the performance degradation and failure rate caused by high temperature.

[0017] Optionally, a plurality of first clamping pins are provided on the front cover, a plurality of second clamping pins are provided on the rear cover, a plurality of first clamping grooves penetrating both ends of the stator are provided on the stator, the front cover is clamped and connected to the stator through the first clamping pins and the first ends of the first clamping grooves, and the rear cover is clamped and connected to the stator through the second clamping pins and the second ends of the first clamping grooves.

[0018] By adopting the above technical solution, the front cover and the rear cover are respectively and quickly and reliably connected to the first clamping groove on the stator through the first clamping pins and the second clamping pins, which not only improves the assembly efficiency, but also enhances the overall stability and reliability of the structure. This connection method avoids the cumbersome procedures and potential loosening risks brought by traditional bolt connections, and further reduces the noise and vibration generated by component loosening during the operation of the motor.

[0019] Optionally, a buffer gasket is provided between the front cover and the stator and / or between the rear cover and the stator.

[0020] By adopting the above technical solution, the buffer washer can effectively reduce the rigid contact between the front cover and the stator and between the rear cover and the stator, thereby reducing the mechanical noise caused by the resonance of structural components and improving the stability and reliability of the motor operation.

[0021] Optionally, a sealing washer is provided between the inner side wall of the front cover and the abutting surface of the first sealed bearing.

[0022] By adopting the above technical solution, the overall sealing performance of the ventilation cavity is significantly improved, enabling the ventilation cavity to withstand higher air pressures, effectively preventing gas leakage, and enhancing the operation stability of the damping component.

[0023] Optionally, a second clamping groove is provided on the first sealed bearing, and the damping cylinder is slidably clamped in the second clamping groove.

[0024] By adopting the above technical solution, the installation of the damping cylinder is more convenient, improving the assembly efficiency. At the same time, this structure can ensure the tight fit between the damping cylinder and the first sealed bearing, reducing noise problems caused by loosening, and further enhancing the noise reduction effect of the motor.

[0025] Optionally, the air inlet blade is a shaftless pump-jet propeller blade.

[0026] By adopting the above technical solution, the design of the air inlet blade as a shaftless pump-jet propeller blade can effectively reduce the air vortex and turbulence phenomena caused by the rotation of the blade, thereby significantly reducing the ventilation noise. At the same time, this design can also reduce the impact force of the inlet air flow on the rotor while ensuring sufficient air intake, further improving the smoothness and reliability of the motor operation.

[0027] Optionally, a dust filter screen is provided at the orifice of the air inlet hole.

[0028] By adopting the above technical solution, the dust filter screen can effectively block solid particles such as dust and sand in the air from entering the interior of the motor, avoiding problems such as poor heat dissipation and short circuit caused by dust accumulation, thereby ensuring that the motor can continuously and stably exert its performance and extending the service life of the motor.

[0029] Optionally, a plurality of heat dissipation fins are provided on the outer wall of the stator.

[0030] By adopting the above technical solution, the heat dissipation fins can quickly transfer the heat generated by the stator to the air, avoiding the accumulation of heat inside the stator, thereby effectively reducing the temperature of the stator, avoiding performance degradation or failures caused by excessive temperature, and improving the service life and reliability of the motor.

[0031] In summary, the present application includes the following beneficial technical effects:

[0032] 1. The noise-reducing pendulum saw motor can not only effectively reduce the mechanical noise caused by bearing vibration during operation, but also improve the operation stability and service life. Specifically, the design of the damping cylinder and the piston rod can effectively absorb and slow down the vibration energy generated during the rotation of the rotor. When the rotor rotates, the air inlet blades drive the external air into the ventilation cavity and further press it into the buffer cavity, forming an "air spring" between the piston rod and the damping cylinder. This structure can not only reduce the impact force between the rolling elements and the raceway inside the bearing, but also reduce the noise propagation path caused by vibration, thus significantly reducing the noise brought by bearing vibration. In addition, the external air inhaled from the air inlet hole can not only provide effective cooling for the inside of the rotor, but also the air flowing out of the buffer cavity can further provide additional cooling effects for the outside of the rotor and the stator during the process of flowing through the cooling cavity.

[0033] 2. The eccentric shaft is directly connected to the rotor, which can effectively achieve the eccentric motion effect required by the pendulum saw. This design not only simplifies the structure, but also improves the transmission efficiency and stability, reduces the noise and vibration caused by the intermediate transmission components, and further reduces the operation noise of the motor. In addition, the ventilation cavity is connected to the air inlet hole, which can guide the external cold air to enter, thus effectively taking away the heat generated by the first sealed bearing and the third sealed bearing during high-speed operation, and improving the overall stability and service life of the motor.

[0034] 3. The communication hole on the piston rod and the communication channel on the front cover enable the high-pressure gas in the ventilation cavity to smoothly enter the inner cavity of the damping cylinder. During this process, the flowing gas can also take away the heat on the surfaces of the front cover and the piston rod, playing a cooling role, further improving the overall heat dissipation efficiency of the motor, and reducing the performance degradation and failure rate caused by high temperature. Description of the Drawings

[0035] Figure 1 is the overall structural schematic diagram of the embodiment of the present application.

[0036] Figure 2 is the front view semi-sectional view of the embodiment of the present application.

[0037] Figure 3 is Figure 2 the partial enlarged view of part A in

[0038] Figure 4 is along Figure 2 the sectional view taken along line B-B in

[0039] Explanation of the reference numerals: 1. shell; 11. front cover; 111. connecting channel; 112. first snap-in pin; 12. rear cover; 121. exhaust hole; 122. second snap-in pin; 2. stator; 21. first snap-in groove; 3. rotor assembly; 31. rotor; 311. air inlet hole; 312. air inlet blade; 313. air outlet hole; 32. first sealed bearing; 321. second snap-in groove; 33. second sealed bearing; 34. cooling chamber; 35. ventilation chamber; 4. damping assembly; 41. damping cylinder; 411. pressure relief hole; 412. snap-in seat; 42. piston rod; 421. connecting hole; 43. elastic member; 44. buffer chamber; 5. eccentric assembly; 51. eccentric shaft; 52. third sealed bearing; 6. buffer gasket; 7. sealing gasket; 8. dust filter; 9. heat sink fin. DETAILED DESCRIPTION

[0040] The following combination Figures 1 - 4 This application is described in further detail.

[0041] The embodiment of the present application discloses a noise-reducing oscillating saw motor.

[0042] Reference Figure 1 and Figure 2 In this embodiment, the swing saw motor includes a housing 1, a stator 2, a rotor assembly 3, a plurality of damping assemblies 4, and an eccentric assembly 5. Specifically, the housing 1 includes a front cover 11 and a rear cover 12 that are arranged opposite to each other. The front cover 11 and the rear cover 12 can be made of aluminum alloy or stainless steel to ensure the corrosion resistance and strength of the motor as a whole; the stator 2 is arranged between the front cover 11 and the rear cover 12, and the two ends of the stator 2 are respectively abutted against the front cover 11 and the rear cover 12. The stator 2 is composed of a stator core and a plurality of coils. The plurality of coils are embedded in the slots of the stator core according to a certain rule. The coils and the coils and the stator core are isolated by insulating paper to prevent current leakage and short circuit.

[0043] A plurality of first clamping grooves 21 are circumferentially and equidistantly formed on the outer wall of the stator 2 along its central axis. The extending direction of the first clamping groove 21 is parallel to the central axis of the stator 2 and penetrates the outer wall of the stator 2; a plurality of first clamping pins 112 for one-to-one clamping cooperation with the plurality of first clamping grooves 21 are provided on the side of the front cover 11 close to the stator 2; a plurality of second clamping pins 122 for one-to-one clamping cooperation with the plurality of first clamping grooves 21 are provided on the side of the rear cover 12 close to the stator 2; the first clamping pin 112 is clamped at one end of the first clamping groove 21 close to the front cover 11, and the second clamping pin 122 is clamped at one end of the first clamping groove 21 close to the rear cover 12; in this way, the front cover 11 and the rear cover 12 are respectively clamped and connected to both ends of the stator 2, and when assembling the motor, the front cover 11 and the rear cover 12 can be conveniently and quickly assembled with the stator 2 to improve the assembly efficiency. At the same time, this connection method avoids the noise and vibration generated by the traditional bolt connection that is prone to loosen under the high-frequency vibration of the motor.

[0044] Preferably, buffer washers 6 are provided between the front cover 11 and the stator 2 and between the rear cover 12 and the stator 2. The buffer washers 6 can prevent rigid contact between the stator 2 and the front cover 11 and the rear cover 12, thereby reducing mechanical noise caused by resonance. The buffer washers 6 can be O-shaped silicone washers, which have good heat conduction performance while providing buffering.

[0045] Refer to Figure 2 , in this embodiment, the rotor assembly 3 includes a rotor 31, a first sealed bearing 32, and a second sealed bearing 33; the rotor 31 is formed by punching and laminating silicon steel sheets. The outer circle of the silicon steel sheet is punched with evenly distributed grooves for placing rotor windings. The silicon steel sheet has the characteristics of high magnetic permeability and low iron loss, which can effectively reduce the iron loss during the operation of the motor and improve the efficiency of the motor; the rotor 31 is arranged inside the stator 2 and is coaxial with the stator 2. The first sealed bearing 32 and the second sealed bearing 33 are respectively sleeved at both ends of the rotor 31. Both ends of the rotor 31 are rotatably connected to the front cover 11 and the rear cover 12 through the first sealed bearing 32 and the second sealed bearing 33 respectively, and one end of the rotor 31 penetrates the rear cover 12; an air inlet hole 311 is formed in the center of the rotor 31, and the air inlet hole 311 communicates with the outside through the end of the rotor 31 penetrating the rear cover 12. An air inlet blade 312 is arranged in the air inlet hole 311 of the rotor 31.

[0046] Preferably, the first sealed bearing 32 and the second sealed bearing 33 can be selected as contact-type sealed bearings, which have good wear resistance and sealing performance; the diameter of the air inlet hole 311 on the rotor 31 can be adjusted according to actual needs; the air inlet blade 312 can be selected as a shaftless pump jet propeller blade to ensure effective reduction of air vortex and turbulence phenomena caused by blade rotation, thereby reducing ventilation noise; in other embodiments, the air inlet blade 312 can also be selected as other types of efficient blades, such as turbine blades or fan-shaped blades.

[0047] Referring to Figure 3 and Figure 4 In this embodiment, the number of damping components 4 is four. The four damping components 4 are circumferentially arranged at equal intervals along the central axis of the rotor 31 between the outer ring of the first sealing bearing 32 and the inner wall of the front cover 11; the damping component 4 includes a damping cylinder 41, a piston rod 42 and an elastic member 43; both the damping cylinder 41 and the piston rod 42 are made of stainless steel material, ensuring strength and having good corrosion resistance at the same time; one end of the damping cylinder 41 is provided with a clamping seat 412, and the other end extends away from the rotor 31. The clamping seat 412 and the damping cylinder 41 are of an integral structure. A second clamping groove 321 for clamping and cooperating with the clamping seat 412 is formed on the outer ring of the first sealing bearing 32. The damping cylinder 41 is clamped on the second clamping groove 321 through the clamping seat 412; one end of the piston rod 42 is connected to the inner wall of the front cover 11, and the other end is provided with a piston and inserted into the damping cylinder 41. The piston is slidably and sealingly connected to the inner wall of the damping cylinder 41 to form a buffer cavity 44 between the piston rod 42 and the damping cylinder 41.

[0048] The elastic member 43 is a spring. The elastic member 43 is sleeved on the outer sides of the damping cylinder 41 and the piston rod 42. One end of the elastic member 43 is fixed to the end of the piston rod 42 away from the damping cylinder 41, and the other end is fixed to the end of the damping cylinder 41 away from the piston rod 42. The elastic member 43 can make the piston rod 42 move away from the damping cylinder 41; the design of the damping component 4 enables the outer ring of the first sealing bearing 32 and the front cover 11 to be elastically connected. When the rotor 31 rotates and generates vibration, the elastic member 43 can absorb part of the vibration of the first sealing bearing 32, thereby achieving the effect of reducing the operating noise of the motor. In other embodiments, the number of damping components 4 can be flexibly adjusted according to the load-bearing requirements of the rotor 31; the damping cylinder 41 can be made of high-strength plastic or lightweight alloy material, having good vibration damping performance; the piston rod 42 can be made of stainless steel or titanium alloy material, having high strength and toughness; the elastic member 43 can also be arranged inside the damping cylinder 41, and both ends of the elastic member 43 are respectively connected to the bottom of the damping cylinder 41 and the end of the piston rod 42 with a piston.

[0049] Referring to Figure 2In this embodiment, the eccentric assembly 5 includes an eccentric shaft 51 and a third sealed bearing 52. The eccentric shaft 51 can be made of high-strength steel to ensure its reliability and stability in long-term operation; one end of the eccentric shaft 51 is sealed and inserted into the end of the air inlet 311 close to the front cover 11 and is directly fixedly connected to the rotor 31, and the other end passes through the front cover 11 to achieve the eccentric motion effect required by the swing saw; this design simplifies the structure, improves the transmission efficiency and stability, and reduces the noise and vibration caused by the intermediate transmission components; the third sealed bearing 52 also uses a contact sealed bearing with good wear resistance and sealing performance; the inner ring of the third sealed bearing 52 seals against the outer wall of the eccentric shaft 51, and the outer ring of the third sealed bearing 52 seals against the inner wall of the front cover 11, and the third sealed bearing 52 is located on the side of the first sealed bearing 32 away from the second sealed bearing 33.

[0050] Reference Figure 2 and Figure 3 In this embodiment, the inner wall of the front cover 11 is provided with a convex ring structure, the side of the first sealing bearing 32 facing away from the second sealing bearing 33 is sealed and abutted against the convex ring structure, and the side of the third sealing bearing 52 close to the first sealing bearing 32 is sealed and abutted against the side of the convex ring structure facing away from the first sealing bearing 32, thereby forming a closed ventilation chamber 35 between the front cover 11, the rotor 31, the first sealing bearing 32 and the third sealing bearing 52.

[0051] The rotor 31 is provided with an air outlet hole 313 connecting the air inlet hole 311 and the ventilation chamber 35, the piston rod 42 is provided with a connecting hole 421 connecting the buffer chamber 44, the front cover 11 is provided with a connecting passage 111 connecting the ventilation chamber 35 and the connecting hole 421, the bottom of the damping cylinder 41 is provided with a pressure relief hole 411 connecting the buffer chamber 44 and the cooling chamber 34, and the rear cover 12 is provided with an exhaust hole 121 connecting the cooling chamber 34 and the outside; when the rotor 31 rotates, the air inlet blade 312 can press the external air into the air inlet hole 31 1, high-pressure air enters the buffer chamber 44 through the air outlet hole 313, the ventilation chamber 35, the connecting channel 111 and the connecting hole 421 in sequence to form an "air spring" between the piston rod 42 and the damping cylinder 41, thereby providing buffering and vibration reduction between the first sealed bearing 32 and the inner wall of the front cover 11 to reduce the noise generated by the vibration of the first sealed bearing 32 when the motor is running; and when the air pressure in the buffer chamber 44 is higher than the preset value, the air can flow out from the pressure relief hole 411 into the cooling chamber 34 and be discharged to the outside from the exhaust hole 121.

[0052] It should be noted that the vibration generated by the motor when working in different scenarios is different. The size of the pressure relief hole 411 can be adjusted according to the air pressure required by the buffer chamber 44 to ensure that the "elastic force" of the "air spring" is neither too large nor too small. In other embodiments, the design of the communication channel 111 and the communication hole 421 can also be cancelled, and the ventilation chamber 35 and the buffer chamber 44 can be directly connected through a pipeline; the connection between the outer ring of the second sealing bearing 33 and the rear cover 12 and the connection between the outer ring of the third sealing bearing 52 and the front cover 11 can also be connected by the damping component 4.

[0053] Preferably, a sealing gasket 7 is provided between the abutting surface of the convex ring structure of the front cover 11 and the first sealing bearing 32. The sealing gasket 7 can be an O-shaped silica gel gasket, which has good thermal conductivity while ensuring the sealing performance; a dust filter net 8 is provided at the orifice of the air inlet hole 311 at one end of the rear cover 12, so as to prevent dust and other impurities from entering the interior of the motor and protect the motor from pollution. A plurality of heat dissipation fins 9 are provided on the outer wall of the stator 2, which helps to improve the heat dissipation effect of the motor and ensure its normal operation in a high-temperature environment.

[0054] The implementation principle of this embodiment is as follows: By reasonably designing the housing 1, the stator 2, the rotor assembly 3, the damping component 4 and the eccentric component 5, the operating noise of the reciprocating saw motor is effectively reduced. Specifically, the air inlet blade 312 sucks in external air through the air inlet hole 311, enters the ventilation chamber 35 through the air outlet hole 313, and then enters the buffer chamber 44 through the communication channel 111 and the communication hole 421 to form an "air spring". The "air spring" can provide buffering and vibration reduction between the piston rod 42 and the damping cylinder 41, effectively absorb and disperse the vibration energy generated by the first sealing bearing 32 when the rotor 31 rotates, and reduce the impact between the first sealing bearing 32 and the front cover 11, thereby significantly reducing the mechanical noise during the operation of the motor; at the same time, when the air flows in from the air inlet hole 311, it can take away part of the heat of the rotor 31, the first sealing bearing 32, the third sealing bearing 52 and the rear cover 12 to reduce the temperature during the operation of the motor, and the air flowing out of the buffer chamber 44 flows through the cooling chamber 34 between the rotor 31 and the stator 2 and is discharged from the exhaust hole 121 at the rear cover 12, which further cools parts such as the stator 2 and the rotor 31, improving the operating stability of the motor; in addition, by optimizing the shape and arrangement of the air inlet blade 312, air turbulence and impact noise can be further reduced, thereby achieving a better noise reduction effect. Generally speaking, the noise-reducing reciprocating saw motor proposed in this embodiment not only has excellent noise reduction performance, but also is optimized in multiple aspects, making it have better heat dissipation performance, thereby improving the operating stability of the motor, extending the service life of the motor, and enhancing the user experience.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A noise-reducing oscillating saw motor, characterized in that: include: A housing (1), the housing (1) comprising a front cover (11) and a rear cover (12) which are arranged opposite to each other; a stator (2), the stator (2) being arranged between the front cover (11) and the rear cover (12); A rotor assembly (3), the rotor assembly (3) comprising a rotor (31), a first sealed bearing (32) and a second sealed bearing (33); the rotor (31) and the stator (2) are coaxial and the rotor (31) is arranged in the stator (2), a cooling cavity (34) is formed between the rotor (31) and the stator (2); the first sealed bearing (32) and the second sealed bearing (33) are respectively sleeved at two ends of the rotor (31), and the rotor (31) is connected to the stator (2) by the first sealed bearing (32) and the second sealed bearing (33). ) are rotatably connected to the front cover (11) and the rear cover (12) respectively; an air inlet hole (311) is provided at the center of the rotor (31), and an air inlet blade (312) is provided in the air inlet hole (311); an inner side wall of the front cover (11) is in sealing contact with a side of the first sealed bearing (32) facing away from the second sealed bearing (33), and a closed ventilation cavity (35) is formed between the front cover (11), the rotor (31) and the first sealed bearing (32), and the ventilation cavity (35) is in communication with the air inlet hole (311); A plurality of damping assemblies (4), wherein the plurality of damping assemblies (4) are circumferentially arranged at equal intervals along the central axis of the rotor (31) between the outer ring of the first sealed bearing (32) and the front cover (11); the damping assembly (4) comprises a damping cylinder (41), a piston rod (42) and an elastic member (43); one end of the damping cylinder (41) is connected to the outer ring of the first sealed bearing (32), and the other end extends in a direction away from the rotor (31); one end of the piston rod (42) is connected to the inner wall of the front cover (11), and the other end is inserted into the damping cylinder (41) and is slidably sealedly connected to the inner wall of the damping cylinder (41) to form a buffer chamber (44) between the piston rod (42) and the damping cylinder (41); the buffer chamber (44) is communicated with the ventilation chamber (35), and the damping cylinder (41) A pressure relief hole (411) is provided at the bottom thereof for connecting the buffer chamber (44) and the cooling chamber (34); an exhaust hole (121) is provided on the rear cover (12) for connecting the cooling chamber (34) and the outside; the elastic member (43) is arranged between the damping cylinder (41) and the piston rod (42) for keeping the piston rod (42) away from the damping cylinder (41); when the rotor (31) rotates, the air inlet blade (312) can press the outside air into the buffer chamber (44) through the air inlet hole (311) and the ventilation chamber (35) in sequence to form an "air spring" between the piston rod (42) and the damping cylinder (41); and when the air pressure in the buffer chamber (44) is higher than a preset value, the air can flow out from the pressure relief hole (411) into the cooling chamber (34) and be discharged from the exhaust hole (121) to the outside.

2. The noise-reducing oscillating saw motor according to claim 1, characterized in that: The invention also comprises an eccentric assembly (5), wherein the eccentric assembly (5) comprises an eccentric shaft (51) and a third sealed bearing (52), wherein the eccentric shaft (51) is connected to one end of the rotor (31) close to the front cover (11), the third sealed bearing (52) is sleeved on the eccentric shaft (51), and the outer ring of the third sealed bearing (52) is sealedly abutted and fixed on the inner wall of the front cover (11) to form a closed ventilation cavity (35) between the front cover (11), the rotor (31), the first sealed bearing (32) and the third sealed bearing (52), and the rotor (31) is provided with an air outlet hole (313) communicating with the air inlet hole (311) and the ventilation cavity (35).

3. A noise-reducing oscillating saw motor according to claim 2, characterized in that: The piston rod (42) is provided with a communication hole (421) communicating with the buffer chamber (44), and the front cover (11) is provided with a communication channel (111) communicating with the communication hole (421) and the ventilation chamber (35).

4. The noise-reducing oscillating saw motor according to claim 1, characterized in that: The front cover (11) is provided with a plurality of first snap-in pins (112), the rear cover (12) is provided with a plurality of second snap-in pins (122), the stator (2) is provided with a plurality of first snap-in slots (21) penetrating through both ends of the stator (2), the front cover (11) is snap-connected to the stator (2) via the first snap-in pins (112) and the first ends of the first snap-in slots (21), and the rear cover (12) is snap-connected to the stator (2) via the second snap-in pins (122) and the second ends of the first snap-in slots (21).

5. The noise-reducing oscillating saw motor according to claim 1, characterized in that: A buffer gasket (6) is provided between the front cover (11) and the stator (2) and / or between the rear cover (12) and the stator (2).

6. The noise-reducing oscillating saw motor according to claim 1, characterized in that: A sealing gasket (7) is provided between the inner side wall of the front cover (11) and the abutment surface of the first sealing bearing (32).

7. The noise-reducing oscillating saw motor according to claim 1, characterized in that: A second clamping groove (321) is provided on the first sealed bearing (32), and a clamping seat (412) is provided at the bottom of the damping cylinder (41), and the clamping seat (412) is slidably clamped in the second clamping groove (321).

8. The noise-reducing oscillating saw motor according to claim 1, characterized in that: The air inlet blades (312) are shaftless pump-propelled propeller blades.

9. The noise-reducing oscillating saw motor according to claim 1, characterized in that: A dust filter (8) is provided at the opening of the air inlet hole (311).

10. The noise-reducing oscillating saw motor according to claim 1, characterized in that: A plurality of heat dissipation fins (9) are provided on the outer wall of the stator (2).

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