Sliding device for vehicle seat

Abstract

The present invention discloses a sliding device for a vehicle seat, comprising a lower rail and an upper rail that slide and cooperate with each other, a nut is fixed in the lower rail, a screw and a power transmission mechanism that drives the screw to rotate are installed in the upper rail, the screw is threadedly matched with the nut, a supporting structure for supporting the screw is fixed in the upper rail, the supporting structure is located at one end of the screw away from the power transmission mechanism, the supporting structure comprises a supporting body and a spherical element, wherein the supporting body is fixed to the upper rail and is provided with a spherical inner cavity adapted to the spherical element, the spherical element is movably embedded in the spherical inner cavity, and a screw through hole is provided in the middle of the spherical element. The present invention can effectively suppress the multi-dimensional jitter of the screw by uniquely designing the supporting structure and utilizing the cooperation of the screw, the spherical element and the supporting body, thereby obtaining an ideal support effect, helping to ensure the stable operation of the sliding device and prolonging its service life.

Description

Technical Field

[0001] The invention relates to a sliding device for a vehicle seat, in particular to a sliding device which is adjusted in an electrically driven manner. Background Art

[0002] In the seat assembly of vehicles such as cars, yachts, and airplanes, a sliding device is usually configured to adjust the seat position of the occupants. Among them, the electrically driven sliding device is widely used because of its convenient operation. This type of sliding device generally includes a lower slide rail fixed to the floor of the vehicle, an upper slide rail installed on the lower slide rail and capable of sliding along the lower slide rail, a set of threaded screws and nuts are respectively fixed to the upper slide rail or the lower slide rail, and the screw rod and the nut are driven by a motor to rotate relative to each other, thereby driving the upper slide rail to slide relative to the lower slide rail.

[0003] A supporting component needs to be provided at the end of the screw rod to suppress the shaking of the screw rod during the adjustment process of the sliding device. Due to complex factors such as pressure from the seat and occupants above, vibration of the vehicle, and rotation of the screw rod itself, the shaking of the screw rod is often multi-dimensional, that is, the screw rod may have a tendency to bend and deform in multiple directions.

[0004] Most of the existing supporting components rely on the deformation of their own plastic materials to absorb the vibration of the screw rod. Due to the limitations of their own structure, the direction in which they can be deformed is often relatively single, and it is difficult to adapt to the multi-dimensional vibration of the screw rod. The supporting effect on the screw rod is relatively limited, which may cause the sliding device to slide poorly, affecting the service life and other technical problems. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a sliding device for a vehicle seat, which can improve the supporting effect on the screw rod and effectively suppress the shaking of the screw rod.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] A sliding device for a vehicle seat comprises a lower rail and an upper rail which slide with each other, wherein a nut is fixed in the lower rail, a screw and a power transmission mechanism for driving the screw to rotate are installed in the upper rail, the screw is arranged axially along the upper rail and cooperates with the nut thread, a supporting structure for supporting the screw is fixed in the upper rail, the supporting structure is located at the end of the screw away from the power transmission mechanism, the supporting structure comprises a supporting body and a spherical element, wherein the supporting body is fixed to the upper rail and is provided with a spherical inner cavity adapted to the spherical element, the spherical element is movably embedded in the spherical inner cavity, a screw through hole is provided in the middle of the spherical element, and the screw passes through the screw through hole.

[0008] By adopting the above technical solution and utilizing the cooperation between the spherical element and the supporting body, the supporting structure can support the screw rod in a ball head manner, which can suppress the shaking of the screw rod in multiple directions, improve the supporting effect of the screw rod, help ensure smooth sliding of the sliding device, and extend the service life of the mechanism.

[0009] Furthermore, the screw hole includes a first tapered section, an intermediate transition section, and a second tapered section arranged in sequence along the axial direction, wherein the first tapered section and the second tapered section are inclined radially outward. Through the taper design of the screw hole, there is a movable margin between the screw and the screw hole. During the operation of the sliding device, when the screw shakes, the spherical element can generate relative movement with the screw, and at the same time, the spherical element can deflect and rotate in the spherical inner cavity, thereby adapting to the shaking trend of the screw in multiple dimensions.

[0010] Furthermore, the supporting body is molded from a plastic material, and includes a gate-shaped frame and a supporting portion integrally formed on the inner side of the gate-shaped frame. The spherical inner cavity is arranged on the supporting portion, and can absorb a portion of the screw rod shaking by relying on the elastic deformation of the supporting body itself, thereby further improving the supporting effect on the screw rod. An arc-shaped petal extending outward is distributed on one end surface of the supporting portion at a position corresponding to the circumferential outer side of the spherical inner cavity to form an outer edge of the spherical inner cavity. The deformation of the arc-shaped petal ensures that the spherical element can be smoothly installed in the spherical inner cavity, and the spherical element is limited after being installed.

[0011] Furthermore, the top of the support part is integrated with the door-shaped frame, with gaps left between the two sides and the door-shaped frame, and the lower end is connected to the lower edge of the door-shaped frame through elastic connecting ribs on both sides. Thanks to this structural design, when the support body is installed on the upper slide rail, the door-shaped frames on both sides can be squeezed to pre-compress the support body. After being installed in the upper slide rail, the door-shaped frame rebounds and squeezes the inner walls on both sides of the upper slide rail, thereby improving the installation stability of the support structure.

[0012] Furthermore, the elastic connecting ribs are curved in a wave shape to improve their elastic deformation capacity while ensuring strength.

[0013] Furthermore, the outer walls on both sides of the door-shaped frame are provided with outwardly protruding blocks, and the side walls on both sides of the upper slide rail are provided with clamping holes at positions corresponding to the clamping blocks, and the clamping blocks are embedded in the corresponding clamping holes, thereby firmly restricting the supporting body in the upper slide rail.

[0014] Furthermore, the screw rod is provided with a small diameter section at the position where it cooperates with the supporting structure, so as to improve the cooperation accuracy between the screw rod and the supporting structure and make the overall structure more compact.

[0015] Beneficial effects:

[0016] The sliding device for vehicle seats that adopts the above technical solution can effectively suppress the multi-dimensional vibration of the screw rod through the unique design of the supporting structure and the cooperation of the screw rod, the spherical element and the supporting body, thereby obtaining an ideal supporting effect, helping to ensure the stable operation of the sliding device and prolong its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the exploded structure of the sliding device for a vehicle seat according to this embodiment;

[0018] Figure 2 for Figure 1 A perspective view of the middle support structure;

[0019] Figure 3 for Figure 2 a cross-sectional view of the spherical element;

[0020] Figure 4 for Figure 2 A three-dimensional view of the middle supporting body;

[0021] Figure 5 for Figure 5 A schematic structural diagram of the support body shown along another viewing direction;

[0022] Figure 6 It is a schematic diagram of the installation structure of the supporting structure and the upper slide rail. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with embodiments and drawings.

[0024] refer to Figure 1 The sliding device for a vehicle seat shown comprises a lower slide rail 1 for fixing to a vehicle floor and an upper slide rail 2 for fixing to a seat bottom. The upper slide rail 2 can slide back and forth along the axial direction of the lower slide rail 1 to adjust the seat position.

[0025] A nut 3 is fixed in the lower rail 1 by a rivet 8, a lead screw 4 extending along its axial direction is installed in the upper rail 2, and the lead screw 4 threadedly passes through the nut 3, and a power transmission mechanism 5 is installed in the upper rail 2 for connecting a power device such as an electric motor to drive the lead screw 4 to rotate in the upper rail 2, thereby making the lead screw 4 and the upper rail 2 slide relative to the lower rail 1. In order to support the lead screw 4, a support structure a is fixed in the upper rail 2 at one end of the lead screw 4 away from the power transmission mechanism 5.

[0026] In order to improve the matching accuracy between the screw rod 4 and the supporting structure a and make the overall structure more compact, a small-diameter section 4a is provided at the end of the screw rod 4 where it matches the supporting structure a.

[0027] Figure 2It is a stereoscopic diagram of the supporting structure a. It can be seen from the figure that the supporting structure a includes a supporting body 6 and a spherical element 7. A screw hole 7a is provided in the middle of the spherical element 7, and the screw 4 passes through the screw hole 7a.

[0028] Figure 4 and Figure 5 The specific structure of the supporting body 6 is shown, which is integrally injection-molded by plastic material as a whole, and includes a door-shaped frame 61. The door-shaped frame 61 is generally N-shaped to form the outer edge contour of the supporting body 6. The inner side of the door-shaped frame 61 has a supporting portion 62 integrally formed therewith. The supporting portion 62 is provided with a spherical inner cavity 6a for accommodating a spherical element 7. The spherical inner cavity 6a is through-connected from front to back. After the spherical element 7 is installed, the screw through hole 7a penetrates the supporting structure a to ensure that the screw 4 can pass smoothly.

[0029] The top of the support portion 62 is integrated with the inner side of the upper end of the door-shaped frame 61. Reinforcement structures such as ribs and pits are distributed on the upper part of the support portion 62 to improve strength and reduce injection defects.

[0030] The two sides of the support part 62 are not directly connected to the door-shaped frame 61, so that a gap 64 is formed between the two sides of the support part 62 and the side walls of the door-shaped frame 61, and the two sides of the lower end of the support part 62 are connected to the lower edge of the corresponding side of the door-shaped frame 61 through an elastic connecting rib 65, so that the gap 64 forms a closed area. With the help of this design, the two sides of the support body 6 can obtain a larger deformation under the action of external force. When it is installed on the upper slide rail 2, the elastic deformation of the two sides of the support body 6 can be used to make the installation more convenient. At the same time, after installation, the two sides of the support body 6 rebound and press against the inner walls of the two sides of the upper slide rail 2 to improve the installation reliability.

[0031] In order to improve the deformation capability of the elastic connecting rib 65 , the elastic connecting rib 65 is configured as a wave-shaped curved structure.

[0032] One end surface of the support portion 62 has a plurality of arcuate petals 63 distributed in a circular array on the circumferential outer side of the corresponding spherical inner cavity 6a. The arcuate petals 63 are located on the side of the support portion 62 facing the power transmission mechanism 5 and extend outward in a circular arc structure to surround the outer edge of the spherical inner cavity 6a.

[0033] Combination Figure 6 It can be seen that in order to facilitate the fixing of the supporting structure a to the upper slide rail 2, the supporting body 6 is provided with outwardly protruding blocks 66 on the outer walls on both sides of the door-shaped frame 61, and the side walls on both sides of the upper slide rail 2 are provided with clamping holes 21 at the positions corresponding to the clamping blocks 66, and the clamping blocks 66 are at least partially embedded in the clamping holes 21, thereby realizing the fixation of the supporting structure a and the upper slide rail 2.

[0034] Reference Figure 3It can be seen that the outer wall of the spherical element 7 is an ellipsoid adapted to the spherical inner cavity 6a. The spherical element 7 can move in the spherical inner cavity 6a, so that the supporting structure a as a whole supports the screw 4 in a manner similar to a ball bearing, thereby effectively suppressing the shaking of the screw 4 in multiple directions during the operation of the sliding device.

[0035] In order to further improve the supporting effect on the screw 4, the screw hole 7a of the spherical element 7 is not a straight hole, but is designed with tapers at both ends. Specifically, the screw hole 7a includes a first taper section 71, an intermediate transition section 72, and a second taper section 73 arranged in sequence along the axial direction, wherein the intermediate transition section 72 is substantially straight, and the first taper section 71 and the second taper section 73 are configured to be inclined radially outward. With this taper design, when the screw 4 bends, deflects, or shakes in other directions, the small diameter section 4a of the screw 4 can always be in good contact with the inner wall of the screw hole 7a to prevent eccentric loading.

[0036] Since the supporting body 6 can be elastically deformed and the spherical element 7 can move in the spherical inner cavity 6a, combined with the special matching structure of the screw rod 4 and the screw rod through hole 7a, the shaking of the screw rod 4 in multiple directions can be effectively suppressed, the supporting effect can be improved, jamming can be avoided, and the smooth operation of the sliding device can be ensured, which helps to extend the service life.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A sliding device for a vehicle seat, comprising a lower sliding rail (1) and an upper sliding rail (2) that slide in cooperation with each other, wherein: A nut (3) is fixed in the lower slide rail (1), a screw rod (4) and a power transmission mechanism (5) for driving the screw rod (4) to rotate are installed in the upper slide rail (2), the screw rod (4) is arranged axially along the upper slide rail (2) and is threadedly matched with the nut (3), a supporting structure (a) for supporting the screw rod (4) is fixed in the upper slide rail (2), the supporting structure (a) is located at the end of the screw rod (4) away from the power transmission mechanism (5), and is characterized in that: the supporting structure (a) includes a supporting body (6) and a spherical element (7), wherein the supporting body (6) is fixed to the upper slide rail (2) and is provided with a spherical inner cavity (6a) adapted to the spherical element (7), the spherical element (7) is movably embedded in the spherical inner cavity (6a), a screw rod through hole (7a) is provided in the middle of the spherical element (7), and the screw rod (4) passes through the screw rod through hole (7a); The screw rod through hole (7a) comprises a first tapered section (71), an intermediate transition section (72) and a second tapered section (73) which are sequentially arranged along the axial direction, wherein the first tapered section (71) and the second tapered section (73) are inclined radially outward; The supporting body (6) is molded from a plastic material and comprises a door-shaped frame (61) and a supporting portion (62) integrally formed on the inner side of the door-shaped frame (61); the spherical inner cavity (6a) is arranged on the supporting portion (62); an arc-shaped petal (63) extending outward is distributed on one end surface of the supporting portion (62) at a position corresponding to the circumferential outer side of the spherical inner cavity (6a) to form the outer edge of the spherical inner cavity (6a).

2. The sliding device for a vehicle seat according to claim 1, characterized in that: The top of the support portion (62) is integrated with the door-shaped frame (61), with gaps (64) between the two sides and the door-shaped frame (61), and the lower end is connected to the lower edge of the door-shaped frame (61) through elastic connecting ribs (65) on both sides.

3. The sliding device for a vehicle seat according to claim 2, characterized in that: The elastic connecting rib (65) is curved in a wave shape.

4. The sliding device for a vehicle seat according to claim 1, characterized in that: The outer walls on both sides of the door-shaped frame (61) are provided with outwardly protruding clamping blocks (66), and the side walls on both sides of the upper slide rail (2) are provided with clamping holes (21) at positions corresponding to the clamping blocks (66).

5. The sliding device for a vehicle seat according to any one of claims 1 to 4, characterized in that: The screw rod (4) is provided with a small diameter section (4a) at a position cooperating with the supporting structure (a).

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