Low noise actuator

Abstract

The utility model relates to a low noise executor, including the casing, its characterized in being configured with in the casing: motor, to provide power, worm, install on the axle branch of motor, gear assembly, for integrated structure, include bevel gear and screw rod, the bevel gear is located the axle end of screw rod one side, with the meshing transmission of worm, the screw rod is used for the torque output to the outside, nut assembly, for integrated structure, include nut, push rod and guide block, the nut and push rod are the staggered configuration of different shafts of center shaft, the nut with the screw rod sliding screw cooperation, the push rod as the executor's executor, to provide power to the outside, the guide block is through with the casing cooperation, to the movement of whole nut assembly provides the guide support.

Description

Technical Field

[0001] This utility model relates to a low-noise actuator, belonging to the field of automotive lock drive mechanisms. Background Technology

[0002] An actuator is a drive unit installed inside a car that enables the car doors to be opened electrically by actuating the car lock.

[0003] Current actuators typically consist of a motor, a spur gear set, and transmission components. The main problems with traditional actuators are as follows:

[0004] 1. During the entire operation of the actuator, the meshing overlap of the spur gear set is low, which will generate greater impact and vibration during transmission, resulting in higher noise.

[0005] 2. The actuator lacks a buffer, which can easily cause an impact noise when the push rod moves to the limit. Utility Model Content

[0006] The present invention aims to solve the various problems mentioned above, and thus provide an actuator with a compact structure, reasonable space utilization and low noise.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0008] A low-noise actuator includes a housing, characterized in that the housing is internally configured with:

[0009] A motor is used to provide power;

[0010] The worm gear is mounted on the shaft of the motor;

[0011] The gear assembly is a one-piece molded structure, including a helical gear and a screw. The helical gear is located at the shaft end on one side of the screw and meshes with the worm gear for transmission. The screw is used to output torque outward.

[0012] The nut assembly is a one-piece molded structure, including a nut, a push rod, and a guide block. The nut and the push rod are staggered with their central axes off-axis, and the nut slides and helically engages with the screw. The push rod serves as the actuator to provide power outward. The guide block, through its engagement with the housing, provides guidance and support for the movement of the entire nut assembly.

[0013] Furthermore, the housing is assembled from an upper housing and a lower housing.

[0014] Furthermore, the guide block has an H-shaped structure, and the guide grooves on both sides of the H-shaped guide block are slidably fitted to the housing.

[0015] Furthermore, the upper center of the guide block of the H-shaped structure is configured as an insert, which is placed in the groove of the upper housing.

[0016] Furthermore, the nut is positioned below the guide block, and the push rod is horizontally positioned on one side of the guide block.

[0017] Furthermore, the nut assembly has two extreme movement positions within the housing, and corresponding buffer blocks are configured at each of the two extreme movement positions.

[0018] Furthermore, at the first extreme movement position of the nut assembly, that is, when the push rod of the nut assembly is fully extended, the housing abuts against the first end face of the guide block of the nut assembly through a pair of buffer blocks; at the second extreme movement position of the nut assembly, that is, when the push rod of the nut assembly is fully retracted, the housing abuts against the second end face of the guide block of the nut assembly through a pair of buffer blocks.

[0019] Furthermore, the second buffer block is a T-shaped structure adapted to the second end face structure of the guide block.

[0020] This utility model discloses a low-noise actuator. To improve noise reduction, firstly, the spur gear set is replaced with a worm gear and helical gear combination. Compared to spur gear transmission, helical gear transmission allows for more even contact during transmission, resulting in higher gear overlap, better continuity, smoother operation, and lower noise. Simultaneously, a buffer block structure is added at the limit position of the transmission components to further eliminate abnormal noise caused by impact at extreme positions. Regarding structural optimization, firstly, the helical gear and screw, and the nut and push rod are each configured as an integrated structure, reducing the number of parts and saving space. Secondly, the nut and push rod are configured as a non-coaxial structure, allowing the push rod to be positioned centrally relative to the entire actuator, reducing product size and saving installation space. Attached Figure Description

[0021] Figure 1 : Exploded view of a low-noise actuator structure according to Embodiment 1;

[0022] Figure 2 : Cross-sectional view of the mating structure of the nut assembly within the housing;

[0023] Figure 3 Diagram showing the nut assembly in its first limit position within the upper housing;

[0024] Figure 4 : Cross-sectional view of the nut assembly in its second limit position within the upper housing;

[0025] In the diagram, 1 is the upper housing, 11 is the upper housing slide groove, 2 is the lower housing, 21 is the lower housing slide groove, 3 is the motor, 4 is the worm gear, 5 is the gear assembly, 51 is the screw, 52 is the helical gear, 6 is the nut assembly, 61 is the guide block, 62 is the push rod, 63 is the nut, 7 is the buffer block one, and 8 is the buffer block two. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings.

[0027] Example 1

[0028] A low-noise actuator includes a housing space consisting of an upper housing 1 and a lower housing 2, and a motor 3, a worm gear 4, a gear assembly 5, and a nut assembly 6 disposed within the housing space.

[0029] The upper shell 1 and the lower shell 2 are assembled into a complete shell, and different accommodating and limiting structures are formed inside the shell to provide placement and positioning of each component inside the shell.

[0030] The motor 3 is fixed between the upper housing 1 and the lower housing 2, and the worm gear 4 is fixed on the shaft 31 of the motor 3, with the motor 3 providing the rotational torque.

[0031] The gear assembly 5 adopts an integral molding structure, including a screw 51 and a helical gear 52 integral with it and located at one end. The helical gear 52 at one end meshes with the worm gear 4 for transmission, while the screw 51 is used to provide output torque to the nut assembly 6.

[0032] The nut assembly 6 also adopts an integral molding structure, including a guide block 61, a nut 63, and a push rod 62. The nut 63 is helically slidingly engaged with the screw 51 of the gear assembly 5, and the push rod 62 provides the actuation action. Specifically, the guide block 61 has an H-shaped structure, with its two sides slidingly engaged with the upper housing groove 11 and the lower housing groove 21, respectively, thereby providing guidance for the stable sliding of the entire nut assembly 6 within the housing. The nut 63 and the push rod 62 are staggered and not coaxial, that is, the central axis of the push rod 62 is not coaxial with the central axis of the screw 51. This staggered configuration can effectively reduce the length of the push rod, thereby reducing the space occupied by the nut assembly 6 inside the actuator.

[0033] To ensure the stability of the nut assembly 6's movement within the housing, an insert is provided at the upper center of the H-shaped guide block 61, and the insert is placed in the groove of the upper housing 1.

[0034] Furthermore, to reduce the impact noise generated by the nut assembly 6 against the housing during movement, especially at its extreme positions, buffer blocks 7 and 8 are respectively provided in the lower housing 2 and the upper housing 1. In this embodiment, buffer blocks 7 are a pair, configured at the first extreme movement position of the nut assembly 6, that is, when the push rod 62 of the nut assembly 6 is fully extended. The two buffer blocks 7 are respectively located on both sides of the push rod 62 and each abuts against the first end face of the guide block 61 of the nut assembly 6. At the second extreme movement position of the nut assembly 6, that is, when the push rod 62 of the nut assembly 6 is fully retracted, the buffer block 8 abuts against the second end face of the guide block 61 of the nut assembly 6.

[0035] The working principle and operation process of the low-noise actuator in this embodiment are as follows:

[0036] When an input current is applied, the motor 3 rotates, which drives the worm gear 4 to move. The worm gear drives the helical gear 52 of the gear assembly 5 to move. The screw 51, which is integrated with the helical gear 52, simultaneously drives the nut 63 of the nut assembly 6 to slide linearly. Finally, the push rod 62, which is integrated with the nut 63, performs the corresponding action.

[0037] This utility model is not limited to the embodiments discussed above. The above description of specific embodiments is intended to describe and illustrate the technical solutions involved in this utility model. Obvious variations, substitutions, or combinations based on the teachings of this utility model should also be considered to fall within the protection scope of this utility model. The above specific embodiments are used to disclose the best implementation method of this utility model, so that those skilled in the art can apply various embodiments and alternative methods of this utility model to achieve the purpose of this utility model.

Claims

1. A low-noise actuator, comprising a housing, characterized in that, The housing is internally configured with: A motor is used to provide power; The worm gear is mounted on the shaft of the motor; The gear assembly is a one-piece molded structure, including a helical gear and a screw. The helical gear is located at the shaft end on one side of the screw and meshes with the worm gear for transmission. The screw is used to output torque outward. The nut assembly is a one-piece molded structure, including a nut, a push rod, and a guide block. The nut and the push rod are staggered with their central axes off-axis, and the nut slides and helically engages with the screw. The push rod serves as the actuator to provide power outward. The guide block, through its engagement with the housing, provides guidance and support for the movement of the entire nut assembly.

2. The low-noise actuator as described in claim 1, characterized in that, The housing is assembled from an upper housing and a lower housing.

3. A low-noise actuator as described in claim 1, characterized in that, The guide block has an H-shaped structure, and the two sides of the H-shaped guide block are respectively slidably engaged with the guide grooves provided in the housing.

4. A low-noise actuator as described in claim 3, characterized in that, The upper center of the guide block of the H-shaped structure is configured as an insert, which is placed in the groove of the upper housing.

5. A low-noise actuator as described in claim 4, characterized in that, The nut is positioned below the guide block, and the push rod is horizontally positioned on one side of the guide block.

6. A low-noise actuator as described in claim 1, characterized in that, The nut assembly has two extreme movement positions within the housing, and corresponding buffer blocks are configured at each of the two extreme movement positions.

7. A low-noise actuator as described in claim 6, characterized in that, At the first extreme movement position of the nut assembly, i.e. when the push rod of the nut assembly is fully extended, the housing abuts against the first end face of the guide block of the nut assembly through a pair of buffer blocks; at the second extreme movement position of the nut assembly, i.e. when the push rod of the nut assembly is fully retracted, the housing abuts against the second end face of the guide block of the nut assembly through a second buffer block.

8. A low-noise actuator as described in claim 7, characterized in that, The second buffer block is a T-shaped structure adapted to the second end face structure of the guide block.

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