Automotive seat horizontal drive assembly

Abstract

This utility model discloses a horizontal drive assembly for an automotive seat, including a motor and a housing. A worm gear and a helical gear are housed within the housing. The motor is connected to the worm gear via a transmission drive to drive its rotation. The worm gear meshes with the helical gear to transmit the worm's rotation to the helical gear, causing it to rotate. Two bushings are arranged opposite each other within the housing. Shoulders are designed at both ends of the helical gear, and these shoulders are inserted into the two bushings to limit and fix the helical gear while allowing it to rotate relative to the bushings. Two collars are also designed at both ends of the helical gear, enclosing the ends of the helical gear teeth and positioned between the shoulders and the teeth. The outer diameter of the shoulders is smaller than the outer diameter of the collars. When the helical gear rotates, the outer end face of the collars can directly contact the inner end face of the corresponding bushing. This utility model effectively avoids direct friction between the irregular end face of the helical gear and the bushings, simplifies the component structure, avoids the abnormal noise problem caused by friction of metal gaskets, and has significant economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an automotive seat horizontal drive assembly. Background Technology

[0002] In automotive seat adjustment systems, the horizontal actuator assembly is a key component, responsible for the smooth horizontal movement of the seat to meet the personalized needs of different drivers and passengers, thus improving comfort and convenience. Existing automotive seat horizontal actuator assemblies typically include core components such as a motor, housing, worm gear, and helical gear. Its working principle involves the motor driving the worm gear through a transmission connection, which then meshes with the helical gear, transmitting the rotation to the helical gear and causing it to rotate to achieve horizontal seat movement. However, the traditional helical gear structure used in widely used seat horizontal actuators currently on the market has several drawbacks. In traditional designs, to prevent direct friction between the irregular end face of the helical gear and the bushing, a metal shim is usually added between the bushing and the helical gear. While this design avoids problems caused by direct friction to some extent, it introduces a series of new defects. First, the added metal shim increases the dimensional chain of the seat actuator assembly along the helical gear axis. In the precision assembly of automotive parts, an increase in the dimensional chain can reduce assembly accuracy and stability, potentially causing problems such as jamming and uneven movement during seat horizontal movement, affecting the precision and comfort of seat adjustment. Secondly, metal shims are prone to generating friction noise during the high-speed rotation of helical gears. Furthermore, as an additional component, the metal shims increase the number of parts in the seat horizontal drive assembly, thereby increasing installation and material costs. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model aims to provide an automotive seat leveling drive assembly to optimize the structure of existing automotive seat leveling drives, improve their performance and reliability, and reduce the number of components.

[0004] To achieve the above objectives, this utility model proposes a horizontal drive assembly for an automotive seat, including a motor and a housing. A worm gear and a helical gear are disposed within the housing. The motor is connected to the worm gear via a transmission mechanism to drive the worm gear to rotate. The worm gear meshes with the helical gear to transmit the rotation of the worm gear to the helical gear, causing the helical gear to rotate. Two bushings are disposed opposite each other within the housing. Shoulders are designed at both ends of the helical gear, and the two shoulders are respectively inserted into the two bushings to limit and fix the helical gear, allowing it to rotate relative to the bushings. Two collars are also designed at both ends of the helical gear, enclosing the ends of the helical gear teeth and positioned between the shoulders and the teeth. The outer diameter of the shoulders is smaller than the outer diameter of the collars. When the helical gear rotates, the outer end face of the collar can directly contact the inner end face of the corresponding side bushing.

[0005] In the above scheme: the shoulder, collar and helical gear are integrally milled, which makes the whole structure a continuous whole, greatly improving the overall strength and stability of the structure, avoiding gaps and looseness between connecting parts, and is easy to process. The integral processing of the shoulder, collar and helical gear can be completed in one clamping and milling process.

[0006] In the above design, the inner surface of the collar is tapered, with a higher outer end and a lower inner end. Each tooth connecting the two collars is an arc shape, pointed at both ends and wide in the middle. This tapered inner surface and arc-shaped teeth design simplifies the manufacturing process to some extent. This special shape can be formed in one step using specific toolpaths and machining parameters, reducing machining steps and time, and improving production efficiency. Furthermore, the tapered design gives the collar higher structural strength, making it less prone to extrusion or friction deformation.

[0007] In the above scheme: the outer contour of the bushing is stepped, and the housing has a stepped groove that matches the outer contour of the bushing. The bushing is snapped and fixed in the stepped groove. The stepped structural design provides a clear positioning reference for the installation of the bushing. During assembly, the operator only needs to align the step of the bushing with the step of the groove in the housing to quickly and accurately install the bushing into the predetermined position. Moreover, the stepped snap-fit ​​structure increases the contact area and connection length between the bushing and the housing, effectively preventing the bushing from loosening, falling off, or shifting during operation.

[0008] In the above scheme: the box body is formed by the front box cover and the rear box cover being fastened together and fixed by bolts. The box body is provided with a chamber for installing worm gear and helical gear. The structure is simple and easy to disassemble and assemble.

[0009] In the above solution: the front box cover is provided with several guide posts, and the rear box cover is provided with guide holes corresponding to each guide post. The front box cover and the rear box cover are mated and fastened together through the cooperation of the guide posts and guide holes. When assembling the front box cover and the rear box cover, the cooperation of the guide posts and guide holes provides precise positioning for both. Operators do not need to spend a lot of time and effort repeatedly adjusting the relative positions of the front and rear box covers; they only need to align the guide posts with the guide holes and insert them to quickly and accurately position the front and rear box covers together, greatly shortening the assembly time and improving production efficiency.

[0010] In the above scheme: the shoulder of the helical gear can be inserted into the inner hole of the bushing and can rotate relative to it. The insertion of the shoulder into the inner hole of the bushing provides the helical gear with precise axial and radial positioning, preventing it from moving due to external forces during operation.

[0011] The beneficial effects of this invention are as follows: By designing the helical gear with a closed-end structure, the bushing can directly contact the end face of the helical gear. Simultaneously, utilizing the collar structure at both ends of the helical gear, the outer end face of the collar can directly contact the inner end face of the corresponding side bushing during high-speed rotation of the helical gear, effectively avoiding direct friction between the irregular end face of the helical gear and the bushing. This innovative design not only reduces the number of metal shims, simplifying the component structure and reducing assembly difficulty and cost, but also reduces the dimensional chain along the helical gear axis of the seat drive assembly, improving the precision and stability of seat adjustment. Furthermore, the new design effectively avoids the abnormal noise problem caused by metal shim friction, improving driving comfort, while reducing the risk of abnormal bushing wear and extending the service life of components, resulting in significant economic benefits. Attached Figure Description

[0012] Figure 1 This is an exploded view of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0014] Figure 3 yes Figure 2 Sectional view at point AA.

[0015] Figure 4 This is a schematic diagram of a helical gear. Detailed Implementation

[0016] like Figure 1 As shown in Figure 4, an automotive seat horizontal drive assembly mainly consists of a motor and a housing 1.

[0017] The housing 1 contains a worm gear 2 and a helical gear 3. The motor is connected to the worm gear 2 for driving the worm gear 2 to rotate. The worm gear 2 meshes with the helical gear 3 to transmit the rotation of the worm gear 2 to the helical gear 3, causing the helical gear 3 to rotate.

[0018] Two bushings 4 are arranged opposite each other inside the housing 1. The two ends of the helical gear 3 are designed with shoulders 31. The two shoulders 31 are respectively inserted into the two bushings 4 to realize the limiting and fixing of the helical gear 3, and the helical gear 3 can rotate relative to the bushings 4.

[0019] The helical gear 3 is also designed with collars 32 at both ends. The two collars 32 are closed at both ends of the teeth 33 of the helical gear 3 and are located between the shoulder 31 and the teeth 33. The outer diameter of the shoulder 31 is smaller than the outer diameter of the collar 32. When the helical gear 3 rotates, the outer end face of the collar 32 can directly contact the inner end face of the corresponding side bushing 4.

[0020] Ideally, the shoulder 31, the collar 32, and the helical gear 3 should be milled as a single unit. This integrated milling process makes the entire structure a continuous whole, greatly improving the overall strength and stability of the structure, avoiding gaps and looseness between connecting parts, and is easy to process. The entire machining of the shoulder 31, the collar 32, and the helical gear 3 can be completed in one clamping and milling process.

[0021] Ideally, the inner surface of the collar 32 is tapered, with a higher outer end and a lower inner end. Each tooth 33 connecting the two collars 32 is an arc shape, pointed at both ends and wide in the middle. This tapered inner surface of the collar 32 and the arc-shaped teeth 33 simplify the machining process to some extent. This special shape can be formed in one step using specific toolpaths and machining parameters, reducing machining steps and time, and improving production efficiency. Furthermore, the tapered design gives the collar 32 higher structural strength, making it less prone to extrusion or friction deformation.

[0022] Ideally, the outer contour of the bushing 4 is stepped, and the housing 1 has a stepped groove that matches the outer contour of the bushing 4, in which the bushing is snapped and fixed. This stepped design provides a clear positioning reference for bushing installation. During assembly, the operator only needs to align the step of the bushing 4 with the step of the groove in the housing 1 to quickly and accurately install the bushing into the predetermined position. Furthermore, the stepped snap-fit ​​structure increases the contact area and connection length between the bushing 4 and the housing 1, effectively preventing the bushing 4 from loosening, falling off, or shifting during operation.

[0023] Ideally, the housing 1 is formed by the front cover 11 and the rear cover 12 being fastened together and fixed by bolts. The housing 1 has a chamber for installing the worm gear 2 and the helical gear 3. The structure is simple and easy to disassemble and assemble.

[0024] Ideally, the front cover 11 is provided with several guide posts, and the rear cover 12 is provided with guide holes corresponding to each guide post. The front cover 11 and the rear cover 12 are mated and fastened together through the cooperation of the guide posts and guide holes. When assembling the front cover 11 and the rear cover 12, the cooperation of the guide posts and guide holes provides precise positioning for both. Operators do not need to spend a lot of time and effort repeatedly adjusting the relative positions of the front and rear covers; they only need to align the guide posts with the guide holes and insert them to quickly and accurately position the front cover 11 and the rear cover 12 together, greatly shortening the assembly time and improving production efficiency.

[0025] Ideally, the shoulder 31 of the helical gear 3 can be inserted into the inner hole of the bushing 4 and can rotate relative to it. The insertion of the shoulder 31 into the inner hole of the bushing 4 provides the helical gear 3 with precise axial and radial positioning, preventing it from moving due to external forces during operation.

Claims

1. A car seat horizontal drive assembly, comprising a motor and a housing (1), wherein a worm gear (2) and a helical gear (3) are disposed within the housing (1), the motor is connected to the worm gear (2) for driving the worm gear (2) to rotate, the worm gear (2) meshing with the helical gear (3) to transmit the rotation of the worm gear (2) to the helical gear (3), causing the helical gear (3) to rotate, two bushings (4) are disposed opposite to each other within the housing (1), and the two ends of the helical gear (3) are designed with shoulders (31), the two shoulders (31) being respectively inserted into the two bushings (4) to achieve the limiting and fixing of the helical gear (3), and the helical gear (3) can rotate relative to the bushings (4), characterized in that: The helical gear (3) is also designed with collars (32) at both ends. The two collars (32) are closed at both ends of the teeth (33) of the helical gear (3) and are located between the shoulder (31) and the teeth (33). The outer diameter of the shoulder (31) is smaller than the outer diameter of the collar (32). When the helical gear (3) rotates, the outer end face of the collar (32) can directly contact the inner end face of the corresponding side bushing (4).

2. The automotive seat leveling drive assembly according to claim 1, characterized in that: The shoulder (31), collar (32) and helical gear (3) are integrally milled.

3. The automotive seat leveling drive assembly according to claim 1, characterized in that: The inner surface of the collar (32) is tapered, with the outer end higher and the inner end lower. Each tooth (33) connecting the two collars (32) is an arc shape with pointed ends and a wide middle.

4. The automotive seat leveling drive assembly according to claim 1, characterized in that: The outer contour of the bushing (4) is stepped, and the box (1) is provided with a stepped groove that matches the outer contour of the bushing (4). The bushing is snapped and fixed in the stepped groove.

5. The automotive seat leveling drive assembly according to claim 1, characterized in that: The housing (1) is formed by the front cover (11) and the rear cover (12) being fastened together and fixed by bolts. The housing (1) has a chamber for installing the worm gear (2) and the helical gear (3).

6. The automotive seat leveling drive assembly according to claim 5, characterized in that: The front box cover (11) is provided with several guide posts, and the rear box cover (12) is provided with guide holes corresponding to each guide post. The front box cover (11) and the rear box cover (12) are connected and fastened by the cooperation of the guide posts and guide holes.

7. The automotive seat leveling drive assembly according to claim 1, characterized in that: The shoulder (31) of the helical gear (3) can be inserted into the inner hole of the bushing (4) and can rotate relative to it.

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