Rotary anti-backlash mechanism for automobile welfare seat

Abstract

The utility model belongs to the technical field of automobile parts, and discloses a rotary anti-backlash mechanism for an automobile welfare seat, which is mounted between a connecting layer and a rotating layer which rotate relatively, a rack on the rotating layer is meshed with a driving motor gear on the connecting layer for driving, and the rotary anti-backlash mechanism comprises an adjustable connecting rod, a limiting top block and a support plate, the supporting plate is fixedly installed on the connecting layer and located at the tail end of the motor installing plate, one end of the adjustable connecting rod is adjustably installed on the supporting plate, the other end of the adjustable connecting rod is connected with the limiting top block, the limiting top block abuts against the tail end of the motor installing plate, and the tooth meshing gap between the driving motor and the rack on the rotating layer is eliminated. The anti-backlash structure is arranged between the connecting layer and the rotating layer which rotate relatively, so that a meshing gap and a structural gap between the gear and the rack are eliminated, and the seat is ensured not to shake and swing obviously under the action of external force at different screwing-out angles.

Description

Technical Field

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

[0002] With the aging population and increasing demand for accessible travel, welfare seats, as an important vehicle modification component, have received significant attention for their safety and stability. One of the core functions of welfare seats is their ability to smoothly rotate and swing outward at a certain angle (i.e., "spin-out"), facilitating direct transfer from a wheelchair or standing position to the seat, or vice versa.

[0003] Currently, traditional structures for enabling the rotating function of welfare seats (such as gear racks, worm gears, or linkages) generally have a technical problem: it is difficult to maintain the absolute stability of the seat at any angle when the seat is rotated out, especially when the user moves their body, uses support, or adjusts their sitting posture and applies multi-directional external forces. This makes it impossible to eliminate uncomfortable or even unsafe shaking or swaying.

[0004] The root of this problem lies in the unavoidable manufacturing and assembly clearances (backlash / gear clearance) in the transmission structure. These clearances may not be noticeable when static, but they can be significantly amplified under actual working conditions: on the one hand, changes in the rotation angle will alter the stress state and contact points of the transmission components, causing the clearances to be concentrated and exposed at certain angles, resulting in a noticeable looseness in the seat; on the other hand, external forces applied by the user can cause the seat to wobble momentarily or experience continuous axial / radial sway through the transmission clearances, which not only poses a risk of falls but also accelerates component wear.

[0005] Existing solutions (such as improving machining accuracy, using preload devices or backlash-eliminating gears) can alleviate backlash, but they have significant limitations, such as: high-precision machining is expensive; preload devices increase friction and wear and the preload force is easy to decay, leading to the recurrence of backlash; and backlash-eliminating mechanisms increase structural complexity and maintenance difficulty.

[0006] Therefore, there is an urgent need in this field for an innovative structural design for eliminating backlash in rotating welfare seats to solve the above problems. Utility Model Content

[0007] To overcome the above-mentioned technical problems, this utility model provides a rotary backlash elimination mechanism for automotive welfare seats. By setting a backlash elimination structure between the relatively rotating connecting layer and the rotating layer, the meshing gap between gears and racks and the structural gap are eliminated, ensuring that the seat does not shake or sway significantly under external force at different rotation angles.

[0008] The main technical solution adopted in this utility model is as follows:

[0009] A rotary backlash elimination mechanism for a car welfare seat is installed between a connecting layer and a rotating layer that rotate relative to each other. A rack on the rotating layer meshes with a drive motor gear on the connecting layer. The mechanism includes an adjustable connecting rod, a limiting top block, and a support plate. The support plate is fixedly installed on the connecting layer and located at the tail end of a motor mounting plate. One end of the adjustable connecting rod is adjustablely installed on the support plate, and the other end is connected to the limiting top block. The limiting top block abuts against the tail end of the motor mounting plate to eliminate the gear meshing backlash between the drive motor and the rack on the rotating layer.

[0010] Preferably, the adjustable connecting rod is an adjustable screw and is threadedly connected to the support plate.

[0011] Preferably, the limiting block is an elastic block used for buffering.

[0012] A rotary backlash elimination mechanism for a car welfare seat is installed between a connecting layer and a rotating layer that rotate relative to each other. A rack on the rotating layer meshes with a drive motor gear on the connecting layer. The mechanism includes an adjustable connecting rod, a limiting block, a support plate, and a baffle. The support plate is fixedly installed on the connecting layer. One end of the adjustable connecting rod is adjustablely installed on the support plate, and the other end is connected to the limiting block. The baffle is installed on the bottom surface of the rotating layer and rotates with the rotating layer. The limiting block is located on the rotation circumference of the baffle. When the rotating layer rotates to a preset position, the limiting block abuts against the baffle, eliminating the gear meshing gap between the drive motor and the rack on the rotating layer.

[0013] Preferably, the mounting base of the support plate is provided with at least one fixing hole and an arc-shaped adjustment groove, and the support plate is rotated and adjusted around the fixing hole along the arc-shaped adjustment groove.

[0014] Preferably, the adjustable connecting rod is an adjustable screw and is threadedly connected to the support plate.

[0015] Preferably, the limiting block is an elastic block used for buffering.

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

[0017] (1) In this utility model, the limiting top block and the baffle or motor mounting plate of the rotating layer form a tight fit, which effectively eliminates the meshing gap and structural gap between the gear and rack, so that even if the seat is subjected to external force after it extends out of the vehicle, the rotating layer can still remain stable and will not produce obvious shaking or swaying.

[0018] (2) In this utility model, by setting an adjustable connecting rod structure and adjusting the length of the adjustable connecting rod, the position of the limiting top block can be precisely controlled to ensure that its cooperation with the baffle or motor mounting plate reaches the best state, which greatly improves the versatility and applicability of the product and can meet the installation needs of various welfare seats on the market. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of seat rotation in Embodiment 1;

[0020] Figure 2 This is a schematic diagram of the rotary backlash elimination mechanism in Embodiment 1.

[0021] Figure 3 This is a schematic diagram of the rotary backlash elimination mechanism in Embodiment 2 (rotation layer omitted).

[0022] Figure 4 This is a partial structural diagram of Embodiment 2;

[0023] In the diagram: Connecting layer 1, drive motor gear 1-1, rotating layer 2, rack 2-1, adjustable connecting rod 3, limit top block 4, support plate 5, mounting base plate 5-1, fixing hole 5-2, arc-shaped adjustment groove 5-3, bolt 5-4, motor mounting plate 6, baffle 7. Detailed Implementation

[0024] 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

[0025] like Figure 1-2 As shown, a rotary backlash elimination mechanism for a car welfare seat is installed between a connecting layer 1 and a rotating layer 2. A rack 2-1 on the rotating layer 2 meshes with a drive motor gear 1-1 on the connecting layer 1. Specifically, it includes an adjustable connecting rod 3, a limiting top block 4, and a support plate 5. The support plate 5 is fixedly installed on the connecting layer 1 and located at the tail end of the motor mounting plate 6. One end of the adjustable connecting rod 3 is adjustablely installed on the support plate 5, and the other end is connected to the limiting top block 4. The limiting top block 4 abuts against the tail end of the motor mounting plate 6 to eliminate the gear meshing gap between the drive motor and the rack 2-1 on the rotating layer.

[0026] In this embodiment 1, the adjustable connecting rod 3 is an adjustable screw and is threadedly connected to the support plate 5.

[0027] In this embodiment 1, the limiting top block 4 is an elastic top block used for buffering, and the material of the elastic top block is preferably polyurethane.

[0028] In this embodiment 1, the adjustable connecting rod 3 can adjust the position of the limiting top block 4 by rotating it with a thread, so that it can press against the tail end of the motor mounting plate. The motor mounting plate 6 is rigidly connected to the drive motor. The pressing force forces the gear to pre-tighten the rack axially, thereby eliminating the meshing gap between the drive motor gear 1-1 on the motor mounting plate 6 and the rack 2-1 on the rotating layer 2, preventing the rotating layer from shaking due to the meshing gap and structural gap when rotating. In this embodiment 1, since the position of the motor mounting plate 6 is fixed, the rotational backlash elimination mechanism can be adjusted and installed before the seat is assembled and shipped from the factory, without the need for additional adjustments after shipment. Example 2

[0029] like Figure 3-4 As shown, a rotary backlash elimination mechanism for a car welfare seat is installed between a connecting layer 1 and a rotating layer 2. The rack on the rotating layer 2 meshes with the gear of the drive motor on the connecting layer 1. Specifically, it includes an adjustable connecting rod 3, a limiting top block 4, a support plate 5, and a baffle 7. The support plate 5 is fixedly installed on the connecting layer 1. One end of the adjustable connecting rod 3 is adjustablely installed on the support plate 5, and the other end is connected to the limiting top block 4. The baffle 7 is installed on the bottom surface of the rotating layer 2 and rotates with the rotating layer 2. The limiting top block 4 is located on the rotation circumference of the baffle 7. When the rotating layer 2 rotates to a preset position (the preset position is the range of the usage angle after the seat is rotated out), the limiting top block 4 abuts against the baffle 7, eliminating the gear meshing gap between the drive motor and the rack 2-1 on the rotating layer 2.

[0030] To ensure applicability to various rotation and extension angles of welfare seats, in this embodiment 2, at least one fixing hole 5-2 and an arc-shaped adjustment groove 5-3 are provided on the mounting base plate 5-1 of the support plate 5. The support plate 5 rotates and adjusts around the fixing hole 5-2 along the arc-shaped adjustment groove 5-3. In this embodiment 2, the fixing hole 5-2 and the arc-shaped adjustment groove 5-3 are respectively connected to the connecting layer 1 by bolts 5-4.

[0031] In this embodiment 2, the adjustable connecting rod 3 is preferably an adjustable screw and is threadedly connected to the support plate 5. The limiting top block 4 is an elastic top block used for cushioning. In this embodiment 2, the material of the elastic top block is preferably polyurethane.

[0032] Since the extension angle of the welfare seat varies depending on the vehicle model, the angle of the rotation clearance elimination mechanism can be adjusted by adjusting the specific extension angle. Specifically: First, loosen the bolts 5-4 connecting the fixing hole 5-2 and the arc-shaped adjustment groove 5-3 to the connecting layer 1. Then, rotate the welfare seat to the rotation extension position. At this time, rotate the adjustable connecting rod 3 to adjust the position of the limiting top block 4, so that the limiting top block 4 and the baffle 7 are pressed together. At the same time, the adjusting plate 5 moves around the fixing hole 5-2 along the arc-shaped adjustment groove 5-3 to adjust the pressing angle between the limiting top block 4 and the baffle 7, ensuring full pressing contact. Finally, tighten the bolts to fix the plate.

[0033] 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 rotary backlash elimination mechanism for a car welfare seat, installed between a connecting layer and a rotating layer that rotate relative to each other, wherein a rack on the rotating layer meshes with a drive motor gear on the connecting layer for drive, characterized in that, It includes an adjustable connecting rod, a limiting top block, and a support plate. The support plate is fixedly installed on the connecting layer and located at the tail end of the motor mounting plate. One end of the adjustable connecting rod is adjustablely installed on the support plate, and the other end is connected to the limiting top block. The limiting top block abuts against the tail end of the motor mounting plate to eliminate the meshing gap between the drive motor and the rack on the rotating layer.

2. The rotation gap eliminating mechanism for a well-being seat of an automobile according to claim 1, characterized by, The adjustable connecting rod is an adjustable screw and is threadedly connected to the support plate.

3. The rotation gap eliminating mechanism for a well-being seat of an automobile according to claim 1, characterized by, The limiting block is an elastic block used for buffering.

4. A rotary gap eliminating mechanism for a car well-being seat, installed between a connection layer and a rotary layer which are relatively rotated, a rack gear on the rotary layer being engaged with a driving motor gear on the connection layer to be driven, characterized in that, It includes an adjustable connecting rod, a limiting top block, a support plate, and a baffle. The support plate is fixedly installed on the connecting layer. One end of the adjustable connecting rod is adjustablely installed on the support plate, and the other end is connected to the limiting top block. The baffle is installed on the bottom surface of the rotating layer and rotates with the rotating layer. The limiting top block is located on the rotation circumference of the baffle. When the rotating layer rotates to a preset position, the limiting top block abuts against the baffle, eliminating the tooth meshing gap between the drive motor and the rack on the rotating layer.

5. The rotation gap eliminating mechanism for a welfare seat of an automobile according to claim 4, characterized by The mounting base of the support plate is provided with at least one fixing hole and an arc-shaped adjustment groove. The support plate can be rotated and adjusted around the fixing hole along the arc-shaped adjustment groove.

6. A rotation gap eliminating mechanism for a welfare seat of an automobile according to claim 4, characterized in that, The adjustable connecting rod is an adjustable screw and is threadedly connected to the support plate.

7. The rotation gap eliminating mechanism for a welfare seat of an automobile according to claim 4, characterized by The limiting block is an elastic block used for buffering.

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