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EP-4318895-B1 - NOISE REDUCTION AND SHOCK ABSORPTION STRUCTURE FOR TUBULAR MOTOR

EP4318895B1EP 4318895 B1EP4318895 B1EP 4318895B1EP-4318895-B1

Inventors

  • PENG, KESHENG

Dates

Publication Date
20260506
Application Date
20230801

Claims (16)

  1. A noise reduction and shock absorption structure for a tubular motor, comprising a motor casing (1), a motor body (2), an output support (3), an output shaft (4), a fixing seat (5), a first damping assembly (6), and a second damping assembly (7); the motor body (2) is provided inside the motor casing (1); a front end of the motor body (2) is connected to a transmission shaft (8) to transmit motions; the output support (3) is embedded at a front end of the motor casing (1); the output shaft (4) is rotatable and passes through the output support (3); the fixing seat (5) is embedded within the motor casing (1); the first damping assembly (6) is provided between the transmission shaft (8) and the output shaft (4); the second damping assembly (7) is provided between a rear end of the motor body (2) and the fixing seat (5); the first damping assembly (6) comprises a first connecter (61) and a second connecter (62) both made of metals or high-strength plastics, and a first buffer piece (63) and a second buffer piece (64) both made of rubber or silicone; the transmission shaft (8), the first connecter (61), the second connecter (62), and the output shaft (4) are connected coaxially in sequence; a circumferential surface of the transmission shaft (8) is sleeved by the first buffer piece (63); an input end of the first connecter (61) sleeves the first buffer piece (63), the second buffer piece (64) sleeves a circumferential surface and an end surface of an output end of the first connecter (61); the second connecter (62) sleeves the second buffer piece (64); the second damping assembly (7) comprises a third connecter (71) and a fourth connecter (72) both made of metals or high-strength plastics, and a third buffer piece (73) and a fourth buffer piece (74) both made of rubber or silicone; the rear end of the motor body (2), the third connecter (71), the fourth connecter (72), and the fixing seat (5) are connected coaxially in sequence; the third buffer piece (73) sleeves on a spline head between the third connecter (71) and the fourth connecter (72), a fourth buffer piece (74) sleeves on a spline head between the fourth connecter (72) and the fixing seat (5); an input end of the first connecter (61) is a first spline hole (611), and the circumferential surface of the transmission shaft (8) is sleeved by a fifth connecter (65) made of metals or high-strength plastics; an outer shape of the first buffer piece (63) matches with a shape of the first spline hole (611); an outer shape of the fifth connecter (65) matches with a shape of an inner cavity of the first buffer piece (63), and an inner cavity of the fifth connecter (65) matches with a shape of the transmission shaft (8).
  2. The noise reduction and shock absorption structure of claim 1, wherein an output end of the first connecter (61) is a first spline head (612), and a first spline groove (641) corresponding to the first spline head (612) is formed on the second buffer piece (64).
  3. The noise reduction and shock absorption structure of claim 2, wherein an end surface of the second connecter (62) facing towards the first connecter (61) is recessed to form a second spline groove (621); an end of the second spline groove (621) away from the first connecter (61) is stepped to form a through hole (622) in communication with the second spline groove (621) for the output shaft (4) to pass through; a limiting plate (41) is provided at an end of the output shaft (4) to abut against an end surface of the second buffer piece (64); first limiting grooves (623) on which the limiting plate (41) is slidable along an axial direction of the second spline groove (621) are formed on side walls of the second spline groove (621); the first limiting grooves (623) extend to the end of the second spline groove (621) away from the first connecter (61).
  4. The noise reduction and shock absorption structure of claim 2, wherein a length of the first spline groove (641) is greater than a length of the first spline head (612).
  5. The noise reduction and shock absorption structure of claim 1, wherein a shaft rotation hole (31) is formed in the output support extending along an axis of the output support (3); the output shaft (4) passes through the shaft rotation hole (31) and is rotatable inside the shaft rotation hole (31); a plurality of damping rings (9) are provided between a circumferential surface of the output shaft (4) and an inner wall of the shaft rotation hole (31).
  6. The noise reduction and shock absorption structure of claim 1, wherein a speed reduction device (10) is provided on an output end of the motor body (2); an input end of the speed reduction device (10) is connected with a rotating shaft of the motor body (2) to achieve motion transmission; an output end of the speed reduction device (10) is connected with the transmission shaft (8) to achieve motion transmission.
  7. The noise reduction and shock absorption structure of claim 1, wherein a plurality of first limiting plates (21) are provided around a peripheral edge of an end surface of the rear end of the motor body (2); second limiting grooves (712) corresponding to the first limiting plates (21) are formed circumferentially around an end portion of the third connecter (71) facing towards the motor body (2); the first limiting plates (21) are inserted into the second limiting grooves (712) respectively.
  8. The noise reduction and shock absorption structure of claim 1, wherein said spline head between the third connecter (71) and the fourth connecter (72) is a second spline head (713) provided at one end of the third connecter (71) facing towards the fourth connecter (72); a second spline hole (731) is formed at one end of the third buffer piece (73) facing towards the third connecter (71), and a third spline head (732) is provided at another end of the third buffer piece (73) facing towards the fourth connecter (72); and the second spline hole (731) extends through an end surface of the third spline head (732); a third spline hole (722) is formed at one end of the fourth connecter (72) facing towards the third connecter (71); the second spline head (713) is sleeved by the second spline hole (731), and the third spline head (732) is sleeved by the third spline hole (722).
  9. The noise reduction and shock absorption structure of claim 8, wherein a first stepped platform (733) is provided on a circumferential surface of the third buffer piece (73), the third spline head (732) protrudes from an end surface of the first stepped platform (733), and an end surface of the fourth connecter (72) abuts against the first stepped platform (733).
  10. The noise reduction and shock absorption structure of claim 8, wherein a plurality of second limiting plates (714) are provided on a circumferential surface of the third connecter (71); third limiting grooves (734) corresponding to the second limiting plates (714) are formed on an end surface of the third buffer piece (73) facing towards the third connecter (71); the second limiting plates (714) are inserted into the third limiting grooves (734) respectively.
  11. The noise reduction and shock absorption structure of claim 1, wherein said spline head between the fourth connecter (72) and the fixing seat (5) is a fourth spline head (723)provided at one end of the fourth connecter (72) facing towards the fixing seat (5); a fourth spline hole (741) and a fifth spline head (742) are provided at two ends of the fourth buffer piece (74) respectively; the fourth spline hole (741) extends through an end surface of the fifth spline head (742); a fifth spline hole (52) is formed at one end of the fixing seat (5) facing towards the fourth connecter (72); the fourth spline head (723) is sleeved by the fourth spline hole (741), and the fifth spline head (742) is sleeved by the fifth spline hole (52).
  12. The noise reduction and shock absorption structure of claim 11, wherein a second stepped platform (724) is provided on a circumferential surface of the fourth connecter (72), and the fourth spline head (723) protrudes from an end surface of the second stepped platform (724); a third stepped platform (743) is provided on a circumferential surface of the fourth buffer piece (74), and the fifth spline head (742) protrudes from an end surface of the third stepped platform (743); an end surface of the fourth buffer piece (74) abuts against the second stepped platform (724), and an end surface of the fixing seat (5) abuts against the third stepped platform (743).
  13. The noise reduction and shock absorption structure of claim 1, wherein a circumferential surface of the fixing seat (5) is sleeved with a first damping sleeve (30), and the first damping sleeve (30) is elastically fitted between the fixing seat (5) and an inner wall of the motor casing (1).
  14. The noise reduction and shock absorption structure of claim 1, wherein a third damping assembly (40) is provided between a circumferential surface of the motor body (2) and an inner wall of the motor casing (1); the third damping assembly (40) comprises a sealing tube (401) sleeving around the circumferential surface of the motor body (2), and a plurality of second damping sleeves (402) sleeving around a circumferential surface of the sealing tube (401); the second damping sleeves (402) are elastically fitted between the circumferential surface of the sealing tube (401) and the inner wall of the motor casing (1).
  15. The noise reduction and shock absorption structure of claim 14, wherein fourth limiting grooves (4011) accommodating the second damping sleeves (402) respectively are formed on the circumferential surface of the sealing tube (401).
  16. The noise reduction and shock absorption structure of claim 14, wherein a plurality of stripes (4021) oriented along an axial direction of the tubular motor are formed on a circumferential surface of each of the second damping sleeves (402).

Description

BACKGROUND OF THE INVENTION The present invention relates to the technical field of tubular motors, and in particular to a noise reduction and shock absorption structure for tubular motor. A tubular motor consists of three main sections: stroke, motor, and deceleration, all working inside a circular tube. The stroke section controls the upper and lower limits of the motor, the motor section is responsible for motor rotation, while the deceleration section mostly uses planetary reduction to slow down the motor speed and increase output torque. Tubular motors are mainly used for electric rolling doors, where the motor is hidden inside a rolling tube and is controlled by a remote controller. As the motor rotates, it drives a transmission shaft to rotate and thus roll up or down the curtain. When being rolled up, the curtain is wound on the rolling shaft; when being rolled down, the curtain slides down along an inner side of a guide rail. However, high-speed rotation of the motor causes frequent shaking, which is transmitted to the motor casing. As a result, vibration and noise occur between the motor casing and the rolling shaft, thereby creating a bad user experience. A current solution is to provide a buffer piece between the motor and the motor casing to absorb the vibration. However, this only solves the problem of vibration transmission between the motor and the motor casing. In fact, to prevent the motor's output shaft from deviating during operation, an output bracket and a fixing seat are installed on two ends of the motor respectively to keep both ends of the motor relatively fixed with the motor casing. This means that there is a rigid connection between the two ends of the motor and the motor casing. However, this rigid connection is easily affected by the preciseness in the assembly of different components, and can also cause vibration. Therefore, the noise reduction effect of an existing tubular motor is still not ideal and cannot be used in situations that require silent operation. CN100521452C discloses a sound attenuation and vibration absorption device for a tubular motor, comprising a front vibration absorption component and a back vibration absorption component connected at two ends of the tubular motor and a sealed tube equipped outside the front and the back vibration absorption components and the tubular motor. The back vibration absorption component is directly connected at one end of a housing of the tubular motor, the front vibration absorption component is connected with a front output vibration absorption seat on the other end of the housing of the tubular motor via an III-stage bracket, which is connected with an output shaft seat. The device equipped at two ends of the tubular motor changes the rigid connection and transmission of the tubular motor to elastic connection and transmission with flexible support, so as to reduce and eliminate mechanical noise due to mechanical vibration from the vibration source; and the sealed tube is sheathed outside the tubular motor to seal and isolate the tubular motor in the sealed tube, so as to completely seal the electromagnetic noise generated during operation of the tubular motor in the sealed tube. WO2013181845A1 discloses a tubular motor, comprising a tubular cylinder having a through-cavity and a motor body arranged in the through-cavity of the tubular cylinder, wherein a connecting seat is provided in the front end of the motor body; a bearing seat is provided in the front end of the through-cavity and a fixing seat is provided in the rear end thereof; the connecting seat and the bearing seat, and the rear end of the motor body and the fixing seat are connected via a vibration absorberrespectively; and at least one layer of an elastic element for supporting the motor body is provided in the vibration absorber. There is no rigid contact between the body of the tubular motor and the inner wall of the tubular cylinder so as to be able to absorb vibration and reduce noise. US2011062000A1 discloses a motorized conveyor roller that prevents slip between a power transmission mechanism in a roller tube and the roller tube due to aging. The power transmission mechanism includes a first closed-bottom cylindrical member fit over a second closed-bottom cylindrical member and a bolt for axially pressing the members against one another. The first member receives torque from a motor and a double-sided tape is laid on an outer surface of the first member. Facing surfaces of the first and second members are tapered, and the circumferential wall with the double-sided tape is expandable diametrically. The bolt diametrically expands the circumferential wall pressed by the tapered surface. Thus, an adhesive force of the double-sided tape sandwiched between the circumferential wall and the roller tube is exerted to adhere the outer surface of the first member to an inner surface of a roller tube. EP2466730A1 discloses a gearless roller drive having a transver