Electric slide rail for automobile

Abstract

The utility model discloses an electric slide rail for automobiles, comprising: a first slide rail, which is fixedly connected to the automobile body; an arc-shaped rack, whose cross section is an arc shape, and the concave side of the arc-shaped rack is provided with helical teeth; wherein the arc-shaped rack is fixedly connected to the first slide rail and is arranged along the length direction of the first slide rail; a second slide rail, which is arranged parallel to the first slide rail and can move along the length direction of the first slide rail; a driving motor, which is fixedly installed on the second slide rail; a worm, which is fixedly connected to the output shaft of the driving motor; a screw rod, which meshes with the arc-shaped rack; wherein the worm is arranged vertically with the screw rod, and a worm wheel is coaxially fixedly connected to one end of the screw rod, and the worm wheel meshes with the worm; wherein the driving motor drives the worm to rotate, drives the screw rod to rotate, and enables the screw rod to reciprocate along the length direction of the arc-shaped rack.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric slide rails, in particular to an electric slide rail for automobiles. Background Art

[0002] With the development of automobile science and technology, and the continuous progress of autonomous driving technology, cars are constantly being given more functions besides being a means of transportation, and the interior of the cabin is also showing a variety of usage needs. Electric slides can easily adjust the position of some functional components or decorative components to change the interior space layout of the cabin to meet more passenger needs.

[0003] The most common electric slide rails in cars are seat slide rails, which mostly adopt the principle of screw drive and take advantage of the self-locking of the drive to carry a large load in the sliding direction at any position, static or sliding. However, due to the limitation of the structural principle, it is difficult for the screw rod to achieve long-stroke adjustment. Therefore, in the field of electric long slide rails with a stroke of more than 300mm, the sliding drive structure and the position locking structure are often independently controlled by electric control.

[0004] In existing production models, the slide rails used in the auxiliary instrument panel mostly use a motor to drive a steel cable to pull the slide rails, and use an additional motor to control the locking structure, such as patent application CN201810749195.8. This steel cable solution has a mature manufacturing process, but during the sliding process, when the vehicle collides, it is difficult for the locking control motor to restore the locking state at the moment of the collision. The main load in the sliding direction will act on the steel cable. If the load-bearing capacity of the steel cable is not enough to resist the load during the collision, the steel wire will break and the auxiliary instrument panel will slide, posing a safety hazard.

[0005] There are two main solutions for seat slides in existing mass-produced models: those with a stroke less than 300mm almost all use a screw drive solution, such as patent application CN202320203629.0; slides with a stroke of more than 300mm mostly use a motor to drive a gear rack to push the slide, and an additional motor is used to control the locking structure, such as the solutions in patent applications CN202210088301.9 and 202210270334.5.

[0006] Patent application CN202320203629.0 Due to the characteristics of screw transmission, the screw can only be fixed at both ends of the effective motion range of the nut. In this installation method, when the length increases, the straightness of the screw is difficult to guarantee, so this solution is difficult to apply to slide rails with larger strokes.

[0007] Patent application CN202210088301.9 and patent application 202210270334.5 Due to the limitation of the number of teeth meshing between the gear and the rack, the load-bearing capacity can only be improved by increasing the width of the rack and the gear, but the rack is manufactured according to the stamping process, the material thickness is limited, and the rack width cannot be too large. Relying on an additional locking structure to lock the position, this method cannot be immediately reset and locked in the event of a vehicle collision during the sliding process, and the reliability is poor. Utility Model Content

[0008] The purpose of the utility model is to overcome the defects of the prior art and provide an electric slide rail for automobiles, which only needs to be provided with one power source and can be applicable to various different strokes; it can effectively self-lock at any position and any working state, and can bear the severe load impact when the car collides.

[0009] The technical solution provided by the utility model is:

[0010] An electric slide rail for a car, comprising:

[0011] A first slide rail, which is fixedly connected to the vehicle body;

[0012] An arc-shaped rack, the cross section of which is an arc, and the concave side of the arc-shaped rack is provided with helical teeth;

[0013] Wherein, the arc-shaped rack is fixedly connected to the first slide rail and is arranged along the length direction of the first slide rail;

[0014] a second slide rail, which is arranged parallel to the first slide rail and can move along the length direction of the first slide rail;

[0015] A driving motor, which is fixedly mounted on the second slide rail;

[0016] A worm gear fixedly connected to the output shaft of the driving motor;

[0017] A screw rod meshed with the arc-shaped rack;

[0018] Wherein, the worm and the lead screw are arranged vertically,

[0019] A worm wheel is coaxially fixedly connected to one end of the lead screw, and the worm wheel is meshed with the worm screw;

[0020] The drive motor drives the worm to rotate, which drives the lead screw to rotate, so that the lead screw can move back and forth along the length direction of the arc-shaped rack.

[0021] Preferably, the first slide rail comprises:

[0022] a housing having an interior cavity;

[0023] Two guide rails are arranged inside the shell along the length direction of the shell and are respectively located on both sides of the shell in the width direction;

[0024] Wherein, the shell is provided with two strip-shaped openings which penetrate the length direction of the shell on one side facing the second slide rail, and the strip-shaped openings are arranged in one-to-one correspondence with the guide rails;

[0025] The second slide rail is provided with two connecting parts, which pass through the two strip-shaped openings one by one and are slidably matched and connected to the guide rail.

[0026] Preferably, the second slide rail further comprises:

[0027] A mounting frame, which is arranged parallel to the housing and is used to mount a sliding mechanism in the car;

[0028] Wherein, the two connection parts are fixedly connected to the mounting frame and are respectively arranged close to two sides of the mounting frame in the width direction.

[0029] Preferably, the rack, the worm, the lead screw and the worm wheel are all arranged in the housing; the drive motor is fixedly mounted on the mounting frame, and the output shaft of the drive motor passes through one of the strip-shaped openings, extends into the housing and is connected to the worm.

[0030] Preferably, the central angle corresponding to the cross section of the arc-shaped rack is 90 degrees to 180 degrees.

[0031] Preferably, the lead angle of the screw rod is less than 8 degrees and the tooth angle is 38 degrees.

[0032] Preferably, a mounting seat is integrally formed on the convex side of the arc-shaped rack, and the mounting seat is connected to the housing by bolts.

[0033] Preferably, a plurality of grooves are respectively provided on both sides of the oblique teeth of the arc-shaped rack, and the grooves are provided along the height direction of the oblique teeth.

[0034] Preferably, the second slide rail further comprises:

[0035] A support frame, which is detachably fixedly connected to the connecting portion;

[0036] Wherein, the worm and the lead screw are rotatably supported on the support frame respectively.

[0037] The beneficial effects of the utility model are:

[0038] The electric slide rail for automobiles provided by the utility model only needs to be provided with one power source and can be applied to various different strokes; it can effectively self-lock at any position and any working state, and the meshing bearing surface is large enough to bear the severe load impact during automobile collision; and the installation point of the transmission part can be added at any stroke position to ensure the straightness and stability during vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The figure is a schematic diagram of the external structure of the electric slide rail for automobile according to the utility model.

[0040] Figure 2 The utility model is a schematic diagram of the overall structure of the electric slide rail for automobiles.

[0041] Figure 3 This is a schematic diagram of the installation method of the worm gear mechanism described in the utility model.

[0042] Figure 4 It is a schematic diagram of the cooperation mode between the driving motor, the worm gear and the arc-shaped rack described in the utility model.

[0043] Figure 5 It is a schematic diagram of the front side of the arc-shaped rack described in the present invention.

[0044] Figure 6 It is a schematic diagram of the cross section (end face) of the arc-shaped rack described in the present invention.

[0045] Figure 7 It is an enlarged view of the matching structure of the arc-shaped rack, the worm gear and the lead screw described in the utility model.

[0046] Figure 8 It is a displacement curve diagram of the locking strength comparison test in the test example of the utility model. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0048] like Figure 1-7 As shown, the utility model provides an electric slide rail for automobiles, which includes: a first slide rail 110 , an arc-shaped rack 120 , a second slide rail 130 , a drive motor 140 , a worm 150 , a lead screw 160 and a worm wheel 170 .

[0049] The first slide rail 110 is fixedly connected to the automobile body. The arc-shaped rack 120 is fixedly connected to the first slide rail 110, and the cross section (end face) of the arc-shaped rack 120 is arc-shaped. The concave side of the arc-shaped rack 120 is provided with helical teeth matching the screw rod 160; and the axis of the arc-shaped rack 120 is arranged along the length direction of the first slide rail 110. The arc-shaped rack 120 can be spliced ​​by multiple sections, or it can be manufactured as a whole. The arc-shaped rack structure allows the arc-shaped rack 120 to be semi-enclosed on the outside of the screw rod 160, so that the arc-shaped rack 120 and the screw rod 160 have a larger meshing area, thereby increasing the load-bearing capacity of the slide rail mechanism in the sliding direction.

[0050] As a preference, the central angle corresponding to the cross section (inner contour line) of the arc-shaped rack 120 is 90 degrees to 180 degrees.

[0051] The second slide rail 130 is arranged in parallel with the first slide rail 110 and can move along the length direction of the first slide rail 110. The drive motor 140 is fixedly mounted on the second slide rail 130. In this embodiment, the drive motor 140 and the worm 150, the lead screw 160, and the worm wheel 170 are all mounted on the second slide rail 130. The drive motor 140 can also be replaced by other power sources.

[0052] The worm 150 is coaxially fixedly connected to the output shaft of the driving motor 140 and rotates synchronously with the output shaft of the driving motor 140; the lead screw 160 meshes with the arc-shaped rack 120. The worm 150 and the lead screw 160 are arranged vertically. The worm wheel 170 is coaxially fixedly connected to one end of the lead screw 160 and rotates synchronously with the lead screw 160; and the worm wheel 170 meshes with the worm 150. There is a gap between the worm wheel 170 and the arc-shaped rack 120, and the two are non-contacting and will not interfere.

[0053] The driving motor 140 drives the worm 150 to rotate, thereby driving the worm wheel 170 meshing with the worm 150 to rotate. Since the lead screw 160 and the worm wheel 170 rotate synchronously, a force is generated between the arc-shaped rack 120 and the lead screw 160 along the axial direction of the lead screw 160 (the length direction of the arc-shaped rack 120). Since the arc-shaped rack 120 is fixed, the lead screw 160 rotates while moving under the push of the axial force, causing the lead screw 160 to move along the length direction of the arc-shaped rack 120, that is, along the length direction of the first slide rail 110; thereby driving the second slide rail 130 to move along the length direction of the first slide rail 110.

[0054] In this embodiment, the first slide rail 110 includes: a housing 111 and a guide rail 112. The housing 111 has an internal cavity; two guide rails 112 are fixedly arranged inside the housing 110 along the length direction of the housing 111, and the two guide rails 112 are respectively located on both sides of the width direction of the housing 111. Among them, the housing 111 is provided with two strip openings 111a that penetrate the length direction of the housing 111 on one side (the upper side of the housing) of the housing 111 facing the second slide rail 130, and the strip openings 111a are arranged one-to-one with the guide rails 112.

[0055] As a preference, a partition 111b is provided in the middle of the shell 111 to divide the internal cavity of the shell 111 into two chambers, and the two guide rails 112 are respectively arranged in the two chambers. Correspondingly, the two strip-shaped openings 111a also correspond to the two chambers respectively.

[0056] The second slide rail 130 is provided with two connecting portions 131 . The connecting portions 131 pass through the two strip-shaped openings 111 a in a one-to-one correspondence and are slidably matched and connected to the corresponding guide rails 112 .

[0057] The second slide rail 130 further includes a mounting frame 132, which is arranged parallel to the housing 111 of the first slide rail 110 and is used to install the sliding mechanism in the car. The two connecting parts 131 are fixedly connected to the bottom of the mounting frame 132 and are respectively arranged near the two sides of the mounting frame 132 in the width direction.

[0058] The arc-shaped rack 120, the worm 150, the lead screw 160 and the worm wheel 170 are all arranged in a chamber of the housing 111; the drive motor 140 is located outside the housing and fixedly mounted on the mounting frame 132, and the output shaft of the drive motor 140 passes through one of the strip-shaped openings 111a, extends into the chamber of the housing 111 and is connected to the worm 150. A mounting seat 121 is integrally formed on the back side of the arc-shaped rack 120, and the mounting seat 121 is fixedly connected to the housing 111 by bolts 121a.

[0059] In this embodiment, a harness drag chain mechanism 180 is installed in another chamber of the housing 111, and a cable for driving the motor 140 is installed inside the harness drag chain mechanism 180. One end of the harness drag chain mechanism 180 is fixed to the mounting frame 132, and moves synchronously with the driving motor 140; one end of the harness drag chain mechanism 180 is fixed to the bottom of the housing 111.

[0060] As a preferred embodiment, the second slide rail 130 further includes: a support frame 133, which is fixedly connected to a connecting portion 131 provided on the same side as the driving motor 140 by bolts 133a; wherein the worm 150 and the lead screw 160 are rotatably supported on the support frame 133. The support frame 133 is fixedly connected to the connecting portion 131 in a detachable manner, which can facilitate the installation of the worm 150 and the lead screw 160.

[0061] As a further preferred embodiment, a plurality of grooves 122 are respectively provided on both sides of the helical teeth of the arc-shaped rack 120, and the grooves 122 are provided along the height direction of the helical teeth. The grooves 122 can store lubricating oil to achieve lubrication of the rack and ensure stable operation of the slide rail.

[0062] Due to the provision of an arc-shaped rack structure, the meshing bearing area between the rack and the lead screw is increased, thereby enhancing the bearing capacity of the sliding mechanism; therefore, in applications where the load-bearing capacity has relatively low requirements for locking strength in the sliding direction such as the auxiliary instrument panel slide rail, the arc-shaped rack, worm gear, worm, and lead screw can be manufactured using an injection molding process, thereby reducing manufacturing costs.

[0063] In applications such as seats that require high locking strength in the sliding direction, the worm 150 and the lead screw 160 are made of copper alloy and obtained by cutting.

[0064] Test example

[0065] The matching mechanism of the arc rack and the screw provided by the utility model, as well as the self-locking characteristics and locking strength limit of the helical rack gear structure with the same modulus, the same material and the same tooth width are compared and verified through experiments. In this test example, the rack characteristic parameters of the arc rack used are: the angle of the center angle corresponding to the cross section (inner contour line) of the arc rack is 150°; the lead angle of the matching screw: 8°, the lead: 10.5mm; the number of matching screw heads: 3, the tooth angle: 38°; the major diameter of the matching screw: 26.6mm, the minor diameter: 21mm. The test temperature is 24.5℃ and the humidity is 66.2%.

[0066] like Figure 8 As shown, through test verification, the arc rack and screw rod matching mechanism provided by the utility model cracked when the load exceeded 5624N, while the helical rack with the same modulus, the same material and the same tooth width cracked when loaded to 683N. The test proves that the electric slide rail for automobiles provided by the utility model has a greater load-bearing capacity than the helical rack and pinion mechanism.

[0067] The electric slide rail for automobiles provided by the utility model only requires one motor or other power source and can be applied to various different strokes; it can effectively self-lock at any position and any working state, and the meshing bearing surface is large enough to bear the severe load impact during automobile collision; and the installation point of the transmission part can be added at any stroke position to ensure straightness and stability during vibration.

[0068] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An electric slide rail for a car, characterized in that: include: A first slide rail, which is fixedly connected to the vehicle body; An arc-shaped rack, the cross section of which is an arc, and the concave side of the arc-shaped rack is provided with helical teeth; Wherein, the arc-shaped rack is fixedly connected to the first slide rail and is arranged along the length direction of the first slide rail; a second slide rail, which is arranged parallel to the first slide rail and can move along the length direction of the first slide rail; A driving motor, which is fixedly mounted on the second slide rail; A worm gear fixedly connected to the output shaft of the driving motor; A screw rod meshed with the arc-shaped rack; Wherein, the worm and the lead screw are arranged vertically, A worm wheel is coaxially fixedly connected to one end of the lead screw, and the worm wheel is meshed with the worm screw; The drive motor drives the worm to rotate, which drives the lead screw to rotate, so that the lead screw can move back and forth along the length direction of the arc-shaped rack.

2. The electric slide rail for automobile according to claim 1, characterized in that: The first slide rail comprises: a housing having an interior cavity; Two guide rails are arranged inside the shell along the length direction of the shell and are respectively located on both sides of the shell in the width direction; Wherein, the shell is provided with two strip-shaped openings which penetrate the length direction of the shell on one side facing the second slide rail, and the strip-shaped openings are arranged in one-to-one correspondence with the guide rails; The second slide rail is provided with two connecting parts, which pass through the two strip-shaped openings one by one and are slidably matched and connected to the guide rail.

3. The electric slide rail for automobile according to claim 2, characterized in that: The second slide rail also includes: A mounting frame, which is arranged parallel to the housing and is used to mount a sliding mechanism in the car; Wherein, the two connection parts are fixedly connected to the mounting frame and are respectively arranged close to two sides of the mounting frame in the width direction.

4. The electric slide rail for automobile according to claim 3, characterized in that: The rack, the worm, the lead screw and the worm wheel are all arranged in the housing; the drive motor is fixedly mounted on the mounting frame, and the output shaft of the drive motor passes through one of the strip-shaped openings, extends into the housing and is connected to the worm.

5. The electric slide rail for automobile according to any one of claims 2 to 4, characterized in that: The central angle of the cross section of the arc-shaped rack corresponds to 90 degrees to 180 degrees.

6. The electric slide rail for automobile according to claim 5, characterized in that: The lead angle of the screw rod is less than 8 degrees, and the tooth angle is 38 degrees.

7. The electric slide rail for automobile according to claim 6, characterized in that: A mounting seat is integrally formed on the convex side of the arc-shaped rack, and the mounting seat is connected to the housing by bolts.

8. The electric slide rail for automobile according to claim 7, characterized in that: A plurality of grooves are respectively provided on both sides of the oblique teeth of the arc-shaped rack, and the grooves are provided along the height direction of the oblique teeth.

9. The electric slide rail for automobile according to claim 6, characterized in that: The second slide rail also includes: A support frame, which is detachably fixedly connected to the connecting portion; Wherein, the worm and the lead screw are rotatably supported on the support frame respectively.

Images