Long-stroke driver for front-back adjustment of automobile seat

Abstract

The utility model discloses a long stroke driver for the back-and-forth adjustment of car seat, including box body and install the transmission mechanism in the box body, the transmission mechanism includes the first helical gear, second helical gear and third helical gear that mesh from top to bottom in proper order, the first helical gear is connected with the motor output end, and the second helical gear is connected with the motor output end. A center threaded hole is formed in the third bevel gear, the two ends of the third bevel gear are sleeved with sleeves, the sleeves are made of plastic, and the edges of the outer ends of the sleeves are provided with turned-over edges facing the outer sides. Parallel shaft transmission is adopted, miniaturization of the mechanism is facilitated, and compared with a traditional seat horizontal driver, the seat horizontal driver has the higher speed; the flanging structure of the plastic sleeve can provide axial pre-tightening force, can eliminate structural gaps caused by size accumulation, facilitates stable operation of the driver, and reduces vibration and noise.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile seat drivers, in particular to a long-stroke driver for front-rear adjustment of automobile seats. Background Art

[0002] At present, long-stroke actuators for adjusting car seats forward and backward generally adopt worm gear transmission. The worm gear and worm are arranged in a cross shape, which is not conducive to the miniaturization of the mechanism. On the other hand, after the parts are assembled, the cumulative size of the parts will cause structural gaps, which will affect the stability of the drive operation and generate vibration and noise.

[0003] Therefore, how to solve the defects of the above-mentioned prior art has become the direction of efforts of technicians in this field. Utility Model Content

[0004] The purpose of the present invention is to provide a long-stroke driver for adjusting the front and rear of a car seat, which can completely solve the shortcomings of the above-mentioned prior art.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A long-stroke driver for adjusting a car seat forward and backward comprises a housing and a transmission mechanism installed in the housing. The transmission mechanism comprises a first helical gear, a second helical gear, and a third helical gear meshing in sequence from top to bottom. The first helical gear is connected to the output end of a motor. A central threaded hole is provided on the third helical gear. Sleeves are sleeved at both ends of the third helical gear. The sleeves are made of plastic and have an outwardly flanged outer edge.

[0007] Furthermore, thrust ball bearings are correspondingly installed at both ends of the third helical gear, and the flange is in close contact with one side of the thrust ball bearing.

[0008] Furthermore, the sleeve is movably connected to a support ring, and a fixing block is provided on the support ring.

[0009] Furthermore, both ends of the first helical gear and the second helical gear are driven by plastic bearings.

[0010] Furthermore, both sides of the first helical gear and the second helical gear are provided with weight-reducing grooves, and reinforcing ribs are evenly arranged in the grooves, and the number of the reinforcing ribs is coprime with the number of teeth of the gears.

[0011] Furthermore, rubber sleeves are provided on the side surfaces of the box body corresponding to the two ends of the first bevel gear, protrusions are provided on the side surfaces of the box body along the circumference of the central threaded hole, matching holes are provided on the rubber sleeves corresponding to the protrusions, and the protrusions are interference fit with the matching holes.

[0012] Furthermore, the box body includes a bottom shell and a top cover, and the bottom shell and the top cover are detachably connected by countersunk screws. A first recessed portion is provided on the outer wall of the bottom shell and the top cover corresponding to the first bevel gear, and a second recessed portion is provided on the outer wall of the bottom shell and the top cover corresponding to both ends of the first bevel gear and the second bevel gear.

[0013] Furthermore, the first helical gear and the second helical gear are both plastic gears, and the hardness of the two gears is different.

[0014] Compared with the existing technology, the beneficial effects of the present invention are: the use of parallel shaft transmission is not only conducive to the miniaturization of the mechanism, but also has a higher speed than the traditional seat horizontal drive; the flange structure of the plastic sleeve can provide axial preload, which can eliminate the structural gap caused by the accumulation of dimensions, which is conducive to the stable operation of the drive and reduces vibration and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is an exploded view of the utility model;

[0017] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 4 It is a structural diagram of the top cover in the utility model;

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the first helical gear in the present invention;

[0020] Figure 6 This is a schematic structural diagram of the first helical gear in the present invention;

[0021] Figure 7 It is a structural diagram of the sleeve in the utility model. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0023] like Figures 1 to 7As shown, a long-stroke actuator for adjusting the front and rear ends of a car seat comprises a housing 1 and a transmission mechanism 2 installed in the housing 1. The transmission mechanism 2 comprises a first helical gear 201, a second helical gear 202, and a third helical gear 203 meshing in sequence from top to bottom. The first helical gear 201 is connected to the output end of the motor. The third helical gear 203 has a central threaded hole 3. Sleeves 4 are sleeved at both ends of the third helical gear 203. The sleeve 4 is made of plastic and has an outward flange 5 on the outer edge of the sleeve 4.

[0024] The housing 1 includes a bottom shell 101 and a top cover 102, which are detachably connected via countersunk screws. A first recessed portion 6 is provided on the outer walls of the bottom shell 101 and the top cover 102, corresponding to the first bevel gear 201. Second recessed portions 7 are provided on the outer walls of the bottom shell 101 and the top cover 102, corresponding to both ends of the first and second bevel gears 201 and 202. The provision of the first and second recessed portions 6 and 7 serves to reduce weight without reducing the axial strength of the housing 1.

[0025] In this embodiment, thrust ball bearings 8 are mounted on both ends of the third helical gear 203, and the flange 5 is in close contact with one side of the thrust ball bearing 8. A support ring 9 is movably mounted on the sleeve 4, and two fixing blocks 10 are provided on the support ring 9.

[0026] The thrust ball bearing 8 is installed between the bottom shell 101 and the top cover 102 . Limiting grooves are correspondingly provided on the inner walls of the top cover 102 and the bottom shell 101 . The limiting grooves cooperate with the fixing block 10 to limit the support ring 9 .

[0027] During operation, the driver is installed between the motor and the lead screw and fixed to the seat. The center of the first bevel gear 201 has a connecting hole 11 for connecting to the motor output. The motor output connects to the first bevel gear 201 through this hole, driving the first bevel gear 201 to rotate, thereby driving the second bevel gear 202 and the third bevel gear 203 to rotate. The third bevel gear 203 engages with the lead screw through the center threaded hole 3. After the driver is installed, the lead screw is fixed and does not rotate. Therefore, after the motor drives the first bevel gear 201, the transmission of the second bevel gear 202 drives the third bevel gear 203 to rotate. Through the threaded engagement, the third bevel gear 203 rotates and moves along the axial direction of the lead screw, thereby driving the box, motor and seat to move.

[0028] The sleeve 4 rotates with the third helical gear 203, while the flange 5 of the sleeve 4 closely contacts the end surface of the thrust ball bearing 8, thereby driving the thrust ball bearing 8 to rotate. This structural design helps reduce frictional resistance encountered by the third helical gear 203 during rotation, ensuring smoother rotation and improving its efficiency. The flange 5 not only provides axial preload to ensure the proper operation of the thrust ball bearing 8, but also eliminates structural clearance caused by dimensional accumulation. Its function is equivalent to that of a spring washer, but it has less rigidity and a more compact structure, facilitating miniaturization of the mechanism.

[0029] The support ring 9 is made of plastic and plays the role of bearing radial loads. At the same time, it ensures that the third bevel gear 203 can be stably supported and lubricated during rotation, avoids radial swing of the third bevel gear 203, stabilizes the rotation of the third bevel gear 203, and avoids noise caused by swinging.

[0030] In this embodiment, both ends of the first helical gear 201 and the second helical gear 202 are driven by plastic bearings 12. This design can reduce weight and reduce noise. The plastic bearings 12 are ball bearings, which help reduce friction and improve rotation efficiency.

[0031] In this embodiment, weight-reducing grooves 13 are provided on both sides of the first and second helical gears 201 and 202. Ribs 14 are evenly distributed within the grooves 13, and the number of ribs 14 is co-prime with the number of gear teeth. This rib structure reduces weight while ensuring a certain degree of rigidity. The co-prime number of ribs prevents resonance between the gears and between the ribs 14 and the teeth, thus reducing vibration.

[0032] In this embodiment, rubber sleeves 15 are sleeved on the side surfaces of the housing 1 corresponding to the ends of the first bevel gear 201. Protrusions 16 are provided on the side surfaces of the housing 1 along the circumference of the central threaded hole 3. Matching holes 17 are formed on the rubber sleeve 15 corresponding to the protrusions 16, and the protrusions 16 and the matching holes 17 have an interference fit. A screw hole 18 for the screw to pass through is provided on the rubber sleeve 15 corresponding to the central threaded hole 3. This structural design prevents excessive deformation of the rubber sleeve 15 and clogging of the screw hole 18 during installation.

[0033] In this embodiment, the first helical gear 201 and the second helical gear 202 are both plastic gears, and the hardness of the two gears is different. The two plastic gears use plastics of different hardness, which is conducive to reducing noise.

[0034] The utility model adopts parallel shaft transmission, which has a relatively small transmission ratio, which is not only conducive to the miniaturization of the mechanism, but also has a higher speed than the traditional seat horizontal drive; the flanging structure of the plastic sleeve can provide axial preload, which can eliminate the structural gap caused by the accumulation of dimensions, is conducive to the stable operation of the drive, and reduces vibration and noise.

[0035] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various invention aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, invention aspects lie in less than all of the features of the individual embodiments disclosed above. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0036] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition may be divided into multiple submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed herein may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0037] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination.

[0038] It should be noted that the above embodiments illustrate rather than limit the present invention, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbols placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A long-stroke actuator for adjusting a car seat forward and backward, comprising a housing and a transmission mechanism installed in the housing, characterized in that: The transmission mechanism includes a first helical gear, a second helical gear and a third helical gear that are meshed in sequence from top to bottom. The first helical gear is connected to the output end of the motor. A central threaded hole is opened on the third helical gear. Sleeves are sleeved at both ends of the third helical gear. The sleeve is made of plastic and the outer edge of the sleeve has an outward flange.

2. The long-stroke actuator for front-rear adjustment of a car seat according to claim 1, characterized in that: Thrust ball bearings are correspondingly installed at both ends of the third helical gear, and the flange is in close contact with one side of the thrust ball bearing.

3. The long-stroke actuator for front-rear adjustment of a car seat according to claim 1, characterized in that: The sleeve is movably connected to a support ring, and a fixing block is provided on the support ring.

4. The long-stroke actuator for front-rear adjustment of a car seat according to claim 1, characterized in that: Both ends of the first helical gear and the second helical gear are driven by plastic bearings.

5. The long-stroke actuator for front-rear adjustment of a car seat according to claim 1, characterized in that: Both sides of the first helical gear and the second helical gear are provided with weight-reducing grooves, and reinforcing ribs are evenly arranged in the grooves, and the number of the reinforcing ribs is coprime with the number of teeth of the gears.

6. The long-stroke actuator for front-to-rear adjustment of a car seat according to claim 1, characterized in that: The side surfaces of the box body corresponding to the two ends of the first bevel gear are covered with rubber sleeves, and protrusions are provided on the side surfaces of the box body along the circumference of the central threaded hole. Matching holes are opened on the rubber sleeve corresponding to the protrusions, and the protrusions and the matching holes are interference fit.

7. The long-stroke actuator for front-rear adjustment of a car seat according to claim 1, characterized in that: The box body includes a bottom shell and a top cover, which are detachably connected to each other by countersunk screws. A first recessed portion is provided on the outer wall of the bottom shell and the top cover corresponding to the first bevel gear, and a second recessed portion is provided on the outer wall of the bottom shell and the top cover corresponding to both ends of the first bevel gear and the second bevel gear.

8. The long-stroke actuator for front-rear adjustment of a car seat according to claim 1, characterized in that: The first helical gear and the second helical gear are both plastic gears, and the hardness of the two gears is different.

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