A translation drive mechanism for a car well-being seat

Abstract

This utility model belongs to the field of automotive parts technology and discloses a translation drive mechanism for automotive welfare seats. Mounted on a base plate, it includes a drive motor, a drive screw, a drive block, and a drive block mounting base. The drive motor is mounted on the movable part to be extended via the motor mounting base. One end of the drive screw is driven and connected to the output end of the drive motor, while the other end is rotatably mounted on the screw bracket of the movable part. The drive block mounting base is fixedly mounted on the base plate, and the drive block is floatingly mounted on the drive block mounting base. The drive block passes through the drive screw and is threadedly engaged with it. The drive screw drives the movable part to extend and retract along the axial direction of the drive screw. This utility model not only solves the problems of daily vibration and noise in traditional rigid screw transmission systems and the easy damage to the drive block under collision conditions, but also improves the impact resistance of the drive mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, and specifically relates to a translation drive mechanism for automotive welfare seats. Background Technology

[0002] As car welfare seats become increasingly popular for improving mobility for people with disabilities, the reliability of their underlying translation drive mechanism is becoming more prominent. In traditional lead screw drive systems, the copper nut is typically rigidly fixed directly to the seat frame or drive base plate. This structure has the following problems:

[0003] (1) When the vehicle is in normal driving, the seat mechanism is retracted to the stationary state inside the vehicle. The copper nut and the lead screw are prone to high-frequency friction noise due to continuous vibration, which seriously affects the riding comfort.

[0004] (2) In the extreme conditions of the vehicle front collision test, the translation mechanism causes the lead screw to deform upward instantaneously due to inertial impact, while the rigidly fixed copper nut cannot deflect synchronously with the lead screw, forcing the lead screw thread and the copper nut internal thread to form a forced misalignment interference. Due to the limited bending strength of copper alloy material, under the action of huge impact load, the copper nut is very prone to thread shear fracture or overall breakage, resulting in the failure of the drive system function.

[0005] Therefore, there is an urgent need for a new type of transmission structure that can simultaneously resolve the contradiction between vibration noise and collision failure, ensuring the safety and quietness of welfare seats throughout their entire life cycle. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a translation drive mechanism for automotive welfare seats, which not only solves the problems of daily vibration and abnormal noise in traditional rigid screw transmission systems and the problem of easy damage to the drive block under collision conditions, but also improves the impact resistance of the drive mechanism.

[0007] The main technical solution adopted in this utility model is as follows:

[0008] A translation drive mechanism for a car welfare seat, mounted on a base plate, is characterized by comprising a drive motor, a drive screw, a drive block, and a drive block mounting base. The drive motor is mounted on the movable part to be extended via the motor mounting base. One end of the drive screw is driven and connected to the output end of the drive motor, and the other end is rotatably mounted on the screw bracket of the movable part to be extended. The drive block mounting base is fixedly mounted on the base plate, and the drive block is floatingly mounted on the drive block mounting base. The drive block passes through the drive screw and is threadedly engaged with the drive screw for driving. The drive screw drives the movable part to extend and retract along the axial direction of the drive screw.

[0009] Preferably, it further includes an adhesive layer, which is disposed on the outer periphery of the drive block to eliminate the installation gap between the drive block and the drive block mounting base.

[0010] Preferably, the motor mounting base has a stepped hole along the axial direction, the locking block is locked onto the drive screw, and the locking block is located inside the stepped hole.

[0011] Preferably, there are gaps between the front end of the locking block and the stepped stop of the stepped hole, between the rear end of the locking block and the drive motor housing, and between the locking block and the stepped hole in the circumferential direction.

[0012] Preferably, the drive block is a copper nut, and the drive block mounting base is a nut mounting base.

[0013] Preferably, the drive block mounting base includes a base body, the base body has a cavity for accommodating the drive block, and the base body has through slots on both sides along the axial direction for passing through the drive screw, and the through slots are in communication with the cavity.

[0014] Preferably, the drive motor is a worm gear motor.

[0015] Preferably, the drive screw is a T-shaped screw and is axially driven connected to the drive block.

[0016] Beneficial effects: This utility model provides a translation drive mechanism for automotive welfare seats, which has the following advantages:

[0017] (1) In this utility model, the drive block (e.g., copper nut) and the drive block mounting base (e.g., nut mounting base) are installed in a floating manner, which can effectively compensate for processing and assembly errors, avoid the problem of increased running resistance and abnormal electrical load caused by the misalignment of the lead screw and the drive block, and significantly reduce the operating noise of the equipment. In addition, under the vehicle front collision test conditions, this structure can make the drive block tilt upward synchronously with the lead screw, which can alleviate the impact of huge impact force, prevent the drive block from breaking, thereby greatly improving the impact resistance of the copper nut, and enhancing the safety and reliability of key components while improving the stability of equipment operation.

[0018] (2) In this utility model, an adhesive layer is used to be sleeved on the outer periphery of the drive block to eliminate the installation gap between the drive blocks and the vibration noise between the drive block (e.g., copper nut) and the drive block mounting seat (e.g., nut mounting seat) when the seat mechanism is retracted to a stationary position inside the vehicle.

[0019] (3) In this utility model, by optimizing the structure of the motor mounting base, the impact resistance of the drive mechanism is improved in the front and rear collision tests, which is conducive to enhancing the stability of the translation drive mechanism. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the translation drive mechanism in Example 1;

[0021] Figure 2 This is a partial structural diagram of Example 1;

[0022] Figure 3 This is a schematic diagram (sectional view) of the drive block in Example 1.

[0023] Figure 4 This is a schematic diagram of the drive block mounting base in Embodiment 1;

[0024] Figure 5 This is a structural schematic diagram (sectional view) of the motor mounting bracket in Example 1.

[0025] Figure 6 This is a schematic diagram of the translation state in Example 1;

[0026] In the diagram: 1. Drive motor; 2. Drive screw; 3. Drive block; 4. Drive block mounting base; 4-1. Base body; 4-2. Cavity; 4-3. Through groove; 5. Rubber coating layer; 6. Motor mounting base; 6-1. Step hole; 6-1. Step stop; 6-2. Locking block; 7. Attached telescopic moving part; 8. Base plate; 7-1. Screw bracket. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Example 1

[0028] like Figure 1-3 As shown, a translation drive mechanism for a car welfare seat is mounted on a base plate 8 and includes a drive motor 1, a drive screw 2, a drive block 3, and a drive block mounting base 4. The drive motor 1 is mounted on the retractable movable part 7 via a motor mounting base 6. One end of the drive screw 2 is driven and connected to the output end of the drive motor 1, and the other end is rotatably mounted on the screw bracket 7-1 of the retractable movable part 7. The drive block mounting base 4 is fixedly mounted on the base plate 8, and the drive block 3 is floatingly mounted inside the drive block mounting base 4. The drive block 3 passes through the drive screw 2 and is threadedly engaged with the drive screw 2 for drive. The drive screw 2 drives the retractable movable part 7 to perform retractive movement along the axial direction of the drive screw 2.

[0029] In this embodiment 1, a rubber coating layer 5 is also provided on the outer periphery of the drive block 3, which eliminates the installation gap between the drive block 3 and the drive block mounting seat 4, and avoids vibration and abnormal noise between the drive block 3 and the drive block mounting seat 4 when the seat mechanism is retracted to a stationary position inside the vehicle. In this utility model, the rubber coating layer 5 is elastic.

[0030] In this embodiment 1, as Figure 5 As shown, a stepped hole 6-1 is opened axially inside the motor mounting base 6, and a locking block 6-2 is locked onto the drive screw 2, with the locking block 6-2 located inside the stepped hole 6-1.

[0031] In this embodiment 1, there are gaps between the front end of the locking block 6-2 and the stepped stop 6-11 of the step 6-1 hole, between the rear end of the locking block 6-2 and the housing of the drive motor 1, and between the locking block 6-2 and the stepped hole 6-1 in the circumferential direction. These gaps are to prevent the drive screw 2 from being unable to rotate or having difficulty rotating due to contact friction under normal working conditions.

[0032] In a frontal collision, the locking block 6-2 on the drive screw 2 contacts the housing of the drive motor 1 (eliminating the original gap), and the impact force is transmitted outward through the motor housing. In a rearal collision, the locking block 6-2 on the drive screw 2 contacts the stepped stop 6-11, allowing the impact force to be transmitted outward through the motor mounting bracket 6. This locking block 6-2 structure effectively reduces the impact load directly borne by the screw, thereby significantly improving the overall stability of the translation drive system under frontal and rearal collision test conditions.

[0033] In this embodiment 1, the locking block 6-2 can be, but is not limited to, locking nuts.

[0034] In this invention, the telescopic moving part 7 is an existing workpiece that needs to be telescopically translated by the translation drive mechanism of this invention, and can be, but is not limited to, automotive welfare seats.

[0035] To ensure a floating installation between the drive block 3 and the drive block mounting base 4, the specific structure of the drive block mounting base 4 is as follows:

[0036] like Figure 4 As shown, the drive block mounting base 4 includes a base body 4-1, on which a cavity 4-2 is provided for accommodating the drive block 3. Through slots 4-3 are axially formed on both sides of the base body 4-1 for the drive screw 2 to pass through, and the through slots 4-3 communicate with the cavity 4-2. In this invention, the floating mounting means that the drive block 3 can move slightly in all directions within the base body 4-1. This design effectively avoids misalignment between the drive screw 2 and the drive block 3 due to machining or assembly errors, thereby preventing increased running resistance caused by axial deviation.

[0037] In this embodiment 1, to facilitate the installation of the drive block, the cavity 4-2 on the base 4-1 has an upward opening, and the through groove 4-3 also has an upward opening. The upward-opening cavity 4-2 can cooperate with the bottom surface of the telescopic movable part 7 to form a complete cavity, thereby preventing the drive block from coming out of the base 4-1 without damage.

[0038] In this embodiment 1, the drive block 3 can be, but is not limited to, a copper nut, and the drive block mounting base 4 can be, but is not limited to, a nut mounting base. The drive motor 1 is a worm gear motor, and the drive screw 2 is a T-type screw, and is axially driven connected to the drive block 3 (e.g., a copper nut).

[0039] The working principle of this utility model is as follows:

[0040] The drive motor 1 controls the rotation of the drive screw 2. Under the action of the drive block 3, the drive screw 2 moves axially, thereby driving the drive motor 1 and the telescopic moving part 7, which is fixedly installed with the drive motor 1, to perform axial translational and telescopic movements along with the drive screw 2. Figure 6 As shown.

[0041] In this invention, the drive block 3 (e.g., a copper nut) and the drive block mounting base 4 (e.g., a nut mounting base) are floatingly mounted. This is because when the vehicle is in a frontal collision test state, the drive screw 2 will tilt upwards due to the inertia of the mechanism. At this time, the floating mounting of the drive block 3 and the drive block mounting base 4 allows the drive block 3 to tilt upwards along with the drive screw 2, effectively preventing the drive screw 2 from breaking due to tilting and huge impact force, and greatly improving the impact strength of the copper nut.

[0042] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A translation drive mechanism for a car welfare seat, mounted on a base plate, characterized in that, The device includes a drive motor, a drive screw, a drive block, and a drive block mounting base. The drive motor is mounted on the telescopic moving part via the motor mounting base. One end of the drive screw is driven and connected to the output end of the drive motor, and the other end is rotatably mounted on the screw bracket of the telescopic moving part. The drive block mounting base is fixedly mounted on the base plate, and the drive block is floatingly mounted on the drive block mounting base. The drive block passes through the drive screw and is threadedly engaged with the drive screw for driving. The drive screw drives the telescopic moving part to extend and retract along the axial direction of the drive screw.

2. The translation drive mechanism for a car welfare seat according to claim 1, characterized in that, It also includes an adhesive layer, which is disposed on the outer periphery of the drive block to eliminate the installation gap between the drive block and the drive block mounting base.

3. The translation drive mechanism for a car welfare seat according to claim 1 or 2, characterized in that, The motor mounting base has a stepped hole along the axial direction, and the locking block is locked onto the drive screw, with the locking block located inside the stepped hole.

4. The translation drive mechanism for a car welfare seat according to claim 3, characterized in that, There are gaps between the front end of the locking block and the stepped stop of the stepped hole, between the rear end of the locking block and the drive motor housing, and between the locking block and the stepped hole in the circumferential direction.

5. The translation drive mechanism for a car welfare seat according to claim 1, characterized in that, The drive block is a copper nut, and the drive block mounting base is a nut mounting base.

6. The translation drive mechanism for a car welfare seat according to claim 1, characterized in that, The drive block mounting base includes a base body with a cavity for accommodating the drive block. The base body has through slots on both sides along the axial direction for passing through the drive screw, and the through slots are connected to the cavity.

7. The translation drive mechanism for a car welfare seat according to claim 1, characterized in that, The drive motor is a worm gear motor.

8. The translation drive mechanism for a car welfare seat according to claim 1, characterized in that, The drive screw is a T-shaped screw and is axially driven connected to the drive block.

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