A low-noise linear motion actuator

Abstract

The present invention discloses a low-noise linear motion actuator, comprising an actuator body, the actuator body including a slide rod assembly and a drive mechanism, the actuator body being internally provided with a sealed chamber and a semi-open chamber, the drive mechanism being disposed in the sealed chamber, the slide rod assembly being disposed in the semi-open chamber, the slide rod assembly including a transmission rod and a reciprocating slide rod threadedly connected to the transmission rod, one end of the transmission rod being connected to the drive mechanism, the drive mechanism being used to drive the transmission rod to rotate, the reciprocating slide rod being sleeved on the inner side of the transmission rod, and an elastic element being disposed on the reciprocating slide rod. The present invention provides a low-noise linear motion actuator, which improves the sealing performance and service life of the transmission mechanism by disposing the transmission mechanism in a separate sealed chamber, and eliminates abnormal impact noise during movement of the actuator body by disposing the elastic element.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile actuators, and in particular to a low-noise linear motion actuator. Background Art

[0002] With the development of the automotive industry and the increasing popularity of automobiles, people are increasingly relying on vehicle performance and intelligence. This intelligence is primarily driven by actuators with motors. An actuator is the power output component that allows the door handle to extend. When installed, the hidden door handle slowly pops out from the vehicle body, adding a more streamlined and technological feel. The actuator housing typically consists of a main body and a conventional cover. During torque transmission, the actuator housing positions and engages multiple transmission components within the transmission mechanism. This generates noise during motor operation and torque transmission, and the internal transmission mechanism generates a clattering sound when returning to its original position, resulting in a high level of noise during the actuator return operation, impacting the user experience. Furthermore, existing actuators house both the drive mechanism and transmission assembly within a single chamber. Due to the reciprocating, telescopic motion of the transmission assembly, this lacks enclosure, allowing dust, moisture, and other impurities to enter the chamber during operation. Consequently, the drive mechanism of conventional actuators suffers from a poor operating environment and a short service life. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-noise linear motion actuator, which increases the service life of the driving mechanism by arranging the driving mechanism in a separate sealed chamber, and eliminates the impact noise when the actuator body moves by arranging the elastic element.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a low-noise linear motion actuator, comprising an actuator body, the actuator body comprising a slide rod assembly and a drive mechanism, a sealed chamber and a semi-open chamber being provided inside the actuator body, the drive mechanism being arranged in the sealed chamber, the slide rod assembly being arranged in the semi-open chamber, the slide rod assembly comprising a transmission rod and a reciprocating slide rod threadedly connected to the transmission rod, one end of the transmission rod being connected to the drive mechanism, and the drive mechanism being used to drive the transmission rod to rotate.

[0005] Preferably, the reciprocating slide rod is threadedly connected to the inner side of the transmission rod.

[0006] Preferably, the reciprocating slide is provided with an elastic element, which defines the moving direction of the reciprocating slide in the working stroke as a first direction, and the moving direction of the reciprocating slide in the return stroke as a second direction, and the first direction and the second direction are opposite; the elastic element is used to provide the reciprocating slide with an auxiliary force along the first direction during the working stroke of the reciprocating slide, and to provide the reciprocating slide with a balancing resistance along the first direction during the return stroke of the reciprocating slide, and the auxiliary force and the balancing resistance are greater than zero at any time.

[0007] Preferably, the actuator body also includes an upper cover and a lower shell, the slide rod assembly and the driving mechanism are fixedly mounted in the lower shell, and the elastic element is configured as a balance spring arranged on the outside of the reciprocating slide rod; the reciprocating slide rod is provided with a first limiting portion at one end away from the driving mechanism, and a second limiting portion is provided on the side of the interior of the upper cover and the lower shell near the first limiting portion. When the reciprocating slide rod is in a working stroke, the reciprocating slide rod extends in a direction away from the driving mechanism and the first limiting portion moves in a direction away from the second limiting portion, and the balance spring releases elastic potential energy; when the reciprocating slide rod returns, the reciprocating slide rod retracts in a direction close to the driving mechanism and the first limiting portion moves in a direction close to the second limiting portion, and the balance spring stores elastic potential energy.

[0008] Preferably, the elastic element is configured as a balance spring arranged on the outside of the reciprocating slide rod, a first limiting portion is provided on the outside of the reciprocating slide rod, a second limiting portion matching the reciprocating slide rod is provided inside the transmission rod, and the elastic element is arranged between the first limiting portion and the second limiting portion.

[0009] Preferably, the reciprocating slide is provided with a first limiting portion at one end close to the driving mechanism, and a second limiting portion is provided on one side of the transmission rod close to the first limiting portion. When the reciprocating slide is in the working stroke, the reciprocating slide extends in the direction away from the driving mechanism and the first limiting portion moves in the direction away from the second limiting portion, and the balance spring releases elastic potential energy; when the reciprocating slide returns, the reciprocating slide retracts in the direction close to the driving mechanism and the first limiting portion moves in the direction close to the second limiting portion, and the balance spring stores elastic potential energy.

[0010] Preferably, a first limiting portion is provided on the reciprocating slide rod, and a second limiting portion matching the first limiting portion is provided inside the transmission rod, and the second limiting portion is located on the side of the first limiting portion away from the driving mechanism. When the reciprocating slide rod returns, the reciprocating slide rod extends in the direction away from the driving mechanism and the first limiting portion moves in the direction close to the second limiting portion, and the balance spring stores elastic potential energy; when the reciprocating slide rod is in the working stroke, the reciprocating slide rod retracts in the direction close to the driving mechanism and the first limiting portion moves in the direction away from the second limiting portion, and the balance spring releases elastic potential energy.

[0011] Preferably, the driving mechanism includes a driving motor, and the output shaft of the driving motor is fixedly connected to the transmission rod so that the transmission rod is driven to rotate by the driving motor.

[0012] Preferably, the driving mechanism includes a driving motor and a transmission assembly, and the transmission assembly is used to connect the output shaft of the driving motor and the transmission rod to drive the transmission rod to rotate through the driving motor.

[0013] Preferably, the output shaft of the drive motor is arranged parallel to the transmission rod.

[0014] Preferably, the transmission rod is sealed to the sealed chamber via a sealing connection.

[0015] Preferably, the semi-open chamber is provided with a drainage groove arranged vertically downward on a side away from the transmission assembly, for draining water and air entering the semi-open chamber.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The actuator body of the present invention is internally provided with a sealed chamber and a semi-open chamber. The drive mechanism is disposed in the sealed chamber, and the slide rod assembly is disposed in the semi-open chamber. Placing the drive mechanism in a separate sealed chamber prolongs the service life of the drive mechanism. The sealed chamber is dustproof and waterproof, which improves the operating environment of the drive motor, enhances the corrosion resistance of the actuator body, and increases its service life.

[0018] The actuator body of the present invention is provided with an elastic element on the reciprocating slide rod. On the one hand, the elastic element is used to provide the reciprocating slide rod with an auxiliary force along the working stroke during the working stroke of the reciprocating slide rod, thereby increasing the pushing force. On the other hand, the elastic element is also used to provide the reciprocating slide rod with a balancing resistance in the opposite direction of the return stroke during the return stroke of the reciprocating slide rod, thereby eliminating the transmission disorder problem between the external load and the internal transmission mechanism. Through the provision of the elastic element, the abnormal impact noise during the movement of the actuator body is further eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of an actuator body in a low-noise linear motion actuator of the present invention;

[0020] Figure 2 This is a schematic structural diagram of a first embodiment of a low-noise linear motion actuator according to the present invention;

[0021] Figure 3 This is a structural schematic diagram of a second embodiment of a low-noise linear motion actuator of the present invention;

[0022] Figure 4 Schematic diagram of the structure of a third embodiment of a low-noise linear motion actuator of the present invention;

[0023] Figure 5 Schematic diagram of the structure of a fourth embodiment of a low-noise linear motion actuator of the present invention;

[0024] Figure 6 Schematic diagram of the structure of a fifth embodiment of a low-noise linear motion actuator of the present invention;

[0025] Figure 7 Schematic diagram of the structure of a sixth embodiment of a low-noise linear motion actuator of the present invention;

[0026] Figure 8 This is a structural schematic diagram of a first embodiment of a driving mechanism in a low-noise linear motion actuator of the present invention;

[0027] Figure 9 This is a structural schematic diagram of a second embodiment of a driving mechanism in a low-noise linear motion actuator of the present invention;

[0028] Figure 10 Schematic diagram of the structure of a third embodiment of a driving mechanism in a low-noise linear motion actuator of the present invention;

[0029] Figure 11 This is a schematic structural diagram of the lower housing in a third embodiment of a driving mechanism in a low-noise linear motion actuator of the present invention.

[0030] In the figure: 1. Slide rod assembly; 101. Transmission rod; 1011. Second limiting portion; 102. Reciprocating slide rod; 1021. First limiting portion; 2. Driving mechanism; 201. Driving motor; 202. Transmission assembly; 3. Sealed chamber; 4. Semi-open chamber; 401. Drain groove; 5. Balance spring; 6. Sealing connector; 7. Upper cover; 8. Lower shell; 9. Sliding groove; 10. Sliding block; 11. Sealing gasket. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figure 1 As shown, a low-noise linear motion actuator includes an actuator body. The actuator body includes a slide rod assembly 1 and a drive mechanism 2. A sealed chamber 3 and a semi-open chamber 4 are provided inside the actuator body. The drive mechanism 2 is arranged in the sealed chamber 3, and the slide rod assembly 1 is arranged in the semi-open chamber 4. The slide rod assembly 1 includes a transmission rod 101 and a reciprocating slide rod 102 threadedly connected to the transmission rod 101. One end of the transmission rod 101 is connected to the drive mechanism 2, and the drive mechanism 2 is used to drive the transmission rod 101 to rotate; by arranging the drive mechanism 2 in a separate sealed chamber 3, the service life of the drive mechanism 2 is increased. The sealed chamber 3 is moisture-proof and waterproof, which can improve the working environment of the drive motor 201, improve the corrosion resistance of the actuator body, and increase the service life.

[0033] like Figure 2 As shown, the first embodiment provided by the present invention, the reciprocating slide 102 is sleeved on the outside of the transmission rod 101, and an elastic element is provided on the reciprocating slide 102, defining the moving direction of the reciprocating slide 102 in the working stroke as a first direction, and the moving direction of the reciprocating slide 102 in the return stroke as a second direction, and the first direction and the second direction are opposite; the elastic element is used to provide the reciprocating slide 102 with an auxiliary force along the first direction during the working stroke of the reciprocating slide 102, and to provide the reciprocating slide 102 with a balancing resistance along the first direction during the return stroke of the reciprocating slide 102, and the auxiliary force and the balancing resistance are greater than zero at any time.

[0034] In this embodiment, the actuator is in an extended pushing working mode. In this embodiment, the elastic element is configured as a balance spring 5 sleeved on the outside of the reciprocating slide 102. The reciprocating slide 102 is provided with a first limiting portion 1021 at one end away from the driving mechanism 2, and a second limiting portion 1011 is provided on the side of the semi-open chamber 4 close to the first limiting portion 1021. When the reciprocating slide 102 is in the working stroke, the reciprocating slide 102 is extended and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy; when the reciprocating slide 102 returns, the reciprocating slide 102 retracts and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy; when the reciprocating slide 102 returns, the reciprocating slide 102 retracts and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy. The balance spring 5 stores elastic potential energy by moving toward the second limiting portion 1011. The elastic element is disposed between the first limiting portion 1021 and the second limiting portion 1011. On the one hand, it is used to provide an auxiliary force to the reciprocating slide 102 along the working stroke (pushing stroke) during the working stroke of the reciprocating slide 102, thereby increasing the pushing force. On the other hand, the elastic element is also used to provide a balancing pulling force to the reciprocating slide 102 in the opposite direction of the return stroke during the return stroke (pullback process). This can eliminate the transmission disorder problem between the external load and the internal transmission mechanism. The provision of the elastic element further eliminates the impact noise during the movement of the actuator body. In this embodiment, the first limiting portion 1021 also acts as a slider. The upper cover 7 and the lower shell 8 are respectively provided with a matching sliding groove 9 to limit the axial telescopic movement of the reciprocating slide 102 within the semi-open chamber 4.

[0035] like Figure 3As shown, the second embodiment provided by the present invention, the actuator in this embodiment is in an extended pushing working mode, the difference between the second embodiment and the first embodiment is that the reciprocating slide 102 is sleeved on the outside of the transmission rod 101, and an elastic element is provided on the reciprocating slide, and the elastic element is provided between the first limiting portion 1021 and the second limiting portion 1011, and the reciprocating slide 102 is provided with a first limiting portion 1021 at one end close to the driving mechanism 2, and the side of the semi-open chamber 4 close to the driving mechanism 2 A second limiting portion 1011 is provided, and the second limiting portion 1011 is located on the side of the first limiting portion 1021 close to the driving mechanism 2. When the reciprocating slide 102 is in the working stroke, the reciprocating slide 102 extends and the first limiting portion 1021 moves away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy. When the reciprocating slide 102 is in the return stroke, the reciprocating slide 102 retracts and the first limiting portion 1021 moves toward the second limiting portion 1011, and the balance spring 5 stores elastic potential energy. In this embodiment, the first limiting portion 1021 also acts as a slider, and matching sliding grooves 9 are respectively provided on the upper cover 7 and the lower shell 8 to limit the axial telescopic movement of the reciprocating slide 102 within the semi-open chamber 4.

[0036] like Figure 4 As shown, the third embodiment provided by the present invention is different from the first embodiment in that the actuator in this embodiment is in a retracted and pulled-back working mode. In this embodiment, the elastic element is configured as a balance spring 5 sleeved on the outside of the reciprocating slide 102, and the reciprocating slide 102 is provided with a first limiting portion 1021 at one end close to the driving mechanism 2, and a second limiting portion 1011 matching the first limiting portion 1021 is provided on one side of the semi-open chamber 4 close to the first limiting portion 1021, and the second limiting portion 1011 is located at The first limiting portion 1021 is located away from the side of the driving mechanism 2. When the reciprocating slide 102 is returning, the reciprocating slide 102 extends and the first limiting portion 1021 moves toward the second limiting portion 1011, and the balance spring 5 stores elastic potential energy. When the reciprocating slide 102 is in the working stroke, the reciprocating slide 102 retracts and the first limiting portion 1021 moves away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy. The elastic element is arranged between the first limiting portion 1021 and the second limiting portion 1011. In this embodiment, the first limiting portion 1021 also acts as a slider, and matching sliding grooves 9 are respectively provided on the upper cover 7 and the lower shell 8 to limit the axial telescopic movement of the reciprocating slide 102 within the semi-open chamber 4.

[0037] like Figure 5As shown, the fourth embodiment provided by the present invention is different from the above three embodiments in that, in this embodiment, the actuator body also includes an upper cover 7 and a lower shell 8, the slide rod assembly 1 and the drive mechanism 2 are fixedly installed in the lower shell 8, and the elastic element is configured as a balance spring 5 arranged on the outside of the reciprocating slide rod 102, and the reciprocating slide rod 102 is threadedly connected to the inner side of the transmission rod 101. In this embodiment, the lower actuator is in an extended pushing working mode, and a first limiting portion 1021 is provided at one end of the reciprocating slide 102 away from the driving mechanism 2, and a second limiting portion 1011 is provided on the side of the upper cover 7 and the lower shell 8 close to the first limiting portion 1021, and the second limiting portion 1011 is located on the side of the first limiting portion 1021 close to the driving mechanism 2. When the reciprocating slide 102 is in the working stroke, the reciprocating slide 102 is extended and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy; when the reciprocating slide 102 returns, the reciprocating slide 102 retracts and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy; when the reciprocating slide 102 returns, the reciprocating slide 102 retracts and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy; 021 moves toward the second limit portion 1011, and the balance spring 5 stores elastic potential energy. The elastic element is arranged between the first limit portion 1021 and the second limit portion 1011. On the one hand, it is used to provide an auxiliary force to the reciprocating slide 102 along the working stroke (pushing stroke) of the reciprocating slide 102, thereby increasing the pushing force. On the other hand, the elastic element is also used to provide a balancing pulling force to the reciprocating slide 102 in the opposite direction of the return stroke (pulling back) of the reciprocating slide 102. This can eliminate the transmission disorder problem between the external load and the internal transmission mechanism. The provision of the elastic element further eliminates the impact noise during the movement of the actuator body. In this embodiment, the reciprocating slide 102 is also provided with a sliding block 10, and a matching sliding groove 9 is provided in the transmission rod 101 to limit the axial telescopic movement of the reciprocating slide 102 within the transmission rod 101.

[0038] like Figure 6As shown, in the fifth embodiment provided by the present invention, the reciprocating slide is threadedly connected to the inner side of the transmission rod. The difference from the fourth embodiment is that in this embodiment, the actuator is in an extended pushing working mode, and the elastic element is configured as a balance spring 5 sleeved on the outside of the reciprocating slide 102. The reciprocating slide 102 is provided with a first limiting portion 1021 at one end close to the driving mechanism 2, and a second limiting portion 1011 is provided on the side of the transmission rod 101 close to the driving mechanism 2, and the second limiting portion 1011 is located on the side of the first limiting portion 1021 close to the driving mechanism 2. When the reciprocating slide 102 is in the working stroke, the reciprocating slide 102 is extended and the first limiting portion 1021 moves in a direction away from the second limiting portion 1011, and the balance spring 5 is released. Elastic potential energy; when the reciprocating slide 102 returns, the reciprocating slide 102 retracts and the first limit portion 1021 moves toward the direction close to the second limit portion 1011, and the balance spring 5 stores elastic potential energy; the elastic element is arranged between the first limit portion 1021 and the second limit portion 1011. On the one hand, it is used to provide the reciprocating slide 102 with an auxiliary force along the working stroke (pushing stroke) during the working stroke of the reciprocating slide 102, thereby increasing the pushing force. On the other hand, the elastic element is also used to provide the reciprocating slide 102 with a balancing pulling force opposite to the return direction during the return stroke (pulling back process) of the reciprocating slide 102, which can eliminate the transmission disorder problem between the external load and the internal transmission mechanism. Through the setting of the elastic element, the impact noise during the movement of the actuator body is further eliminated. In this embodiment, a sliding block 10 is further provided on the lower transmission rod 101, and matching sliding grooves 9 are respectively provided on the upper cover 7 and the lower shell 8 to restrict the axial telescopic movement of the transmission rod 101 within the semi-open chamber 4. In this embodiment, a sliding block 10 is further provided on the reciprocating slide 102, and a matching sliding groove 9 is provided in the transmission rod 101 to restrict the axial telescopic movement of the reciprocating slide 102 within the transmission rod 101.

[0039] like Figure 7As shown, in the sixth embodiment provided by the present invention, the reciprocating slide is threadedly connected to the inner side of the transmission rod. The difference from the fourth embodiment is that in this embodiment, the actuator is in a retracting and pulling back working mode, the elastic element is configured as a balance spring 5 sleeved on the outer side of the reciprocating slide 102, the reciprocating slide 102 is provided with a first limiting portion 1021 at one end close to the driving mechanism 2, and the transmission rod 101 is provided with a second limiting portion 1011 matching the first limiting portion 1021 on one side close to the first limiting portion 1021, and the second limiting portion 10 11 is located on the side of the first limiting portion 1021 away from the driving mechanism 2. When the reciprocating slide 102 is returning, the reciprocating slide 102 extends and the first limiting portion 1021 moves toward the second limiting portion 1011, and the balance spring 5 stores elastic potential energy. When the reciprocating slide 102 is in the working stroke, the reciprocating slide 102 retracts and the first limiting portion 1021 moves away from the second limiting portion 1011, and the balance spring 5 releases elastic potential energy. The elastic element is arranged between the first limiting portion 1021 and the second limiting portion 1011. In this embodiment, a sliding block 10 is also provided on the reciprocating slide 102, and a sliding groove 9 matching it is opened in the transmission rod 101 to limit the axial telescopic movement of the reciprocating slide 102 within the transmission rod 101.

[0040] like Figure 8 As shown, a first embodiment of the drive mechanism 2 provided by the present invention comprises a drive motor 201, the output shaft of which is fixedly connected to the transmission rod 101, thereby driving the transmission rod 101 to rotate. The drive motor 201 is placed within the sealed chamber 3, the edges of which are provided with a sealing gasket, and the output shaft of the drive motor 201 is provided with a sealing connector 6. The provision of the sealing connector 6 and the sealing gasket ensures that the drive motor 201 is enclosed in a sealed space, is not susceptible to moisture, and thus ensures its service life.

[0041] like Figure 9 As shown, the second embodiment of the drive mechanism provided by the present invention differs from the first embodiment of the drive mechanism in that the drive mechanism 2 includes a drive motor 201 and a transmission assembly 202. The transmission assembly 202 is used to connect the output shaft of the drive motor 201 and the transmission rod 101, so that the drive motor 201 drives the transmission rod 101 to rotate. The drive motor 201 and the transmission assembly 202 are both placed within the sealed chamber 3. The edge of the sealed chamber 3 is provided with a sealing gasket, and the output shaft of the transmission rod 101 is provided with a sealing connector 6. The provision of the sealing connector 6 and the sealing gasket ensures that the drive motor 201 and the transmission assembly 202 are enclosed in a closed space, are not easily affected by moisture, and ensure their service life.

[0042] like Figure 10 As shown, the third embodiment of the drive mechanism 2 provided by the present invention differs from the second embodiment of the drive mechanism 2 in that the output shaft of the drive motor 201 is arranged parallel to the transmission rod 101, and the transmission rod 101 is sealed to the sealed chamber 3 via a sealing connector 6. The parallel arrangement of the drive motor 201 and the transmission assembly 202 saves space and reduces the volume of the entire actuator body. The transmission assembly 202 enables conversion of the transmission direction and speed.

[0043] like Figure 10 and Figure 11 As shown, the actuator body also includes an upper cover 7 and a lower shell 8. The slide rod assembly 1 and the drive mechanism 2 are fixedly installed in the lower shell 8. The semi-open chamber 4 is provided with a vertically downward drainage groove 401 on the side away from the transmission assembly 202 for discharging water and air entering the semi-open chamber 4.

[0044] Working principle: The actuator body is provided with a sealed chamber 3 and a semi-open chamber 4 which are independent of each other, the driving mechanism 2 is arranged in the sealed chamber 3, the slide assembly 1 is arranged in the semi-open chamber 4, the rotating transmission mechanism is completely sealed in a dry box, and the linear transmission is constrained in an open box. The upper cover 7 and the lower shell 8 are connected in a sealed manner by welding or fusion, which is moisture-proof and waterproof, improves the working environment of the motor, improves the anti-corrosion performance, and increases the service life; an elastic element is provided on the reciprocating slide 102, which is used to provide an auxiliary force to the reciprocating slide 102 along the working stroke during the working stroke of the reciprocating slide 102, which can increase the pushing force. On the other hand, the elastic element is also used to provide a balancing resistance to the reciprocating slide 102 in the opposite direction of the return stroke during the return stroke of the reciprocating slide 102, which can eliminate the transmission disorder problem between the external load and the internal transmission mechanism. By setting the elastic element, the impact noise during the movement of the actuator body is eliminated.

[0045] By providing a drainage groove 402 vertically downwardly arranged on one side of the semi-open chamber 4 away from the transmission assembly 202, water entering the semi-open chamber 4 can be drained.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A low-noise linear motion actuator, comprising an actuator body, wherein the actuator body comprises a slide rod assembly (1) and a drive mechanism (2), characterized in that: A sealed chamber (3) and a semi-open chamber (4) are provided inside the actuator body, the driving mechanism (2) is arranged in the sealed chamber (3), the slide assembly (1) is arranged in the semi-open chamber (4), the slide assembly (1) includes a transmission rod (101) and a reciprocating slide rod (102) threadedly connected to the transmission rod (101), one end of the transmission rod (101) is connected to the driving mechanism (2), and the driving mechanism (2) is used to drive the transmission rod (101) to rotate; The driving mechanism (2) includes a driving motor (201), and the output shaft of the driving motor (201) is fixedly connected to the transmission rod (101), so that the driving motor (201) drives the transmission rod (101) to rotate; or, The driving mechanism (2) comprises a driving motor (201) and a transmission assembly (202), wherein the transmission assembly (202) is used to connect the output shaft of the driving motor (201) and the transmission rod (101), so as to drive the transmission rod (101) to rotate via the driving motor (201); An elastic element is provided on the outer side of the reciprocating slide (102), defining the moving direction of the reciprocating slide (102) in the working stroke as a first direction, and the moving direction of the reciprocating slide (102) in the return stroke as a second direction, and the first direction and the second direction are opposite; the elastic element is used to provide the reciprocating slide (102) with an auxiliary force in the first direction during the working stroke, and to provide the reciprocating slide (102) with a balancing resistance in the first direction during the return stroke, and the auxiliary force and the balancing resistance are both greater than zero at any time.

2. The low-noise linear motion actuator according to claim 1, characterized in that: The reciprocating slide rod (102) is threadedly connected to the inner side of the transmission rod (101).

3. The low-noise linear motion actuator according to claim 1, characterized in that: The actuator body further comprises an upper cover (7) and a lower shell (8), the elastic element being configured as a balance spring (5) arranged outside the reciprocating slide rod (102); a first limiting portion (1021) is provided at one end of the reciprocating slide rod (102) away from the driving mechanism (2), a second limiting portion (1011) is provided inside the upper cover (7) and the lower shell (8) on a side close to the first limiting portion (1021), and the elastic element is arranged between the first limiting portion (1021) and the second limiting portion (1011); when the When the reciprocating slide (102) is in a working stroke, the reciprocating slide (102) extends in a direction away from the driving mechanism (2) and the first limiting portion (1021) moves in a direction away from the second limiting portion (1011), and the balance spring (5) releases elastic potential energy; when the reciprocating slide (102) returns, the reciprocating slide (102) retracts in a direction close to the driving mechanism (2) and the first limiting portion (1021) moves in a direction close to the second limiting portion (1011), and the balance spring (5) stores elastic potential energy.

4. The low-noise linear motion actuator according to claim 1, characterized in that: The elastic element is configured as a balance spring (5) arranged on the outside of the reciprocating slide rod (102); a first limiting portion (1021) is provided on the outside of the reciprocating slide rod (102); a second limiting portion (1011) matching the reciprocating slide rod (102) is provided inside the transmission rod (101); and the elastic element is arranged between the first limiting portion (1021) and the second limiting portion (1011).

5. The low-noise linear motion actuator according to claim 4, characterized in that: The reciprocating slide (102) is provided with a first limiting portion (1021) at one end close to the driving mechanism (2), and a second limiting portion (1011) is provided on one side of the transmission rod (101) close to the first limiting portion (1021). When the reciprocating slide (102) is in a working stroke, the reciprocating slide (102) extends in a direction away from the driving mechanism (2) and the first limiting portion (1021) moves in a direction away from the second limiting portion (1011), and the balance spring (5) releases elastic potential energy; when the reciprocating slide (102) returns, the reciprocating slide (102) retracts in a direction close to the driving mechanism (2) and the first limiting portion (1021) moves in a direction close to the second limiting portion (1011), and the balance spring (5) stores elastic potential energy.

6. The low-noise linear motion actuator according to claim 4, characterized in that: A first limiting portion (1021) is provided on the reciprocating slide (102), and a second limiting portion (1011) matching the first limiting portion (1021) is provided inside the transmission rod (101), and the second limiting portion (1011) is located on the side of the first limiting portion (1021) away from the driving mechanism. When the reciprocating slide (102) returns, the reciprocating slide (102) extends in a direction away from the driving mechanism and the first limiting portion (1021) moves in a direction close to the second limiting portion (1011), and the balance spring (5) stores elastic potential energy; when the reciprocating slide (102) is in a working stroke, the reciprocating slide (102) retracts in a direction close to the driving mechanism and the first limiting portion (1021) moves in a direction away from the second limiting portion (1011), and the balance spring (5) releases elastic potential energy.

7. The low-noise linear motion actuator according to claim 1, characterized in that: The output shaft of the driving motor (201) is arranged in parallel with the transmission rod (101).

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