A car rear seat backrest angle adjustment driver

Abstract

This invention discloses a rear seat backrest angle adjustment actuator for automobiles, comprising a drive motor, an intermediate reducer, an output screw, and a movable slider connected in sequence. The power output shaft of the drive motor is parallel and spaced apart from the output screw. A first worm gear is mounted on the power output shaft, and a second worm wheel is mounted at the end of the output screw. The reducer housing of the intermediate reducer contains a coaxial and synchronously rotating first worm wheel and second worm gear. The first worm wheel and second worm gear are rotatably mounted on the reducer housing via a spindle. The first worm gear meshes with the first worm wheel, and the second worm gear meshes with the second worm wheel. A screw bearing is rotatably mounted on the inner end of the reducer housing corresponding to the output screw. An adjusting nut is screwed into the inner hole of the screw bearing. A screw wear-resistant pad is embedded in the nut housing of the adjusting nut, and the screw wear-resistant pad makes contact with the output screw. Through the above structural design, this invention has the advantages of novel structural design, good stability and reliability, and good self-locking stability.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a driver for adjusting the angle of the rear seat backrest of a car. Background Technology

[0002] For the rear seat backrests of cars, in order to meet the comfort requirements of passengers, the seat backrest angle needs to be adjustable, and the seat backrest angle adjustment is driven by the corresponding seat backrest angle adjustment driver.

[0003] Chinese invention patent application with patent number ZL202411360519.0 and patent name: "An Electric Adjuster for Car Seat Backrests" discloses the following technical solution: An electric adjuster for car seat backrests includes an adjustment plate, an arc-shaped guide rail at the upper end of the adjustment plate, a guide rod slidably connected inside the arc-shaped guide rail, one end of the guide rod connected to a slider, a locking hook connected to one side of the slider, the locking hook being used to fix it to one side of the car seat backrest, and a transmission mechanism installed at one end of the adjustment plate, the transmission mechanism causing the locking hook to rotate the car seat backrest to adjust its usage angle; the transmission mechanism includes a motor installed at one end of the adjustment plate, the motor driving a gearbox, the output shaft of the gearbox being coaxially connected to a lead screw, and the lead screw being threadedly connected to the slider.

[0004] In the process of adjusting the angle of the car seat back using the aforementioned electric car seat back adjuster, the lead screw starts to rotate under the drive of the motor, and the slider moves along a specific path under the guidance of the guide rod, thereby adjusting the angle of the seat back.

[0005] It should be noted that the aforementioned electric recliner for car seat backs still has the following drawbacks, specifically:

[0006] Defect 1: During operation, the motor drives the lead screw to rotate after being reduced in speed by the gearbox. Since the gearbox cannot achieve effective self-locking, when the seat back is adjusted to the required angle position, the passenger's leaning action or movement will cause the seat back to bear a large pushing force. Due to the inability to effectively self-lock, the seat back will shift under the large pushing force, resulting in poor stability.

[0007] Defect 2: Under the thrust generated when a passenger sits, the seat back will directly transmit the reaction force to the slider and lead screw. Under repeated axial impact, the lead screw will become axially loose. This axial loosening will make the electric seat back angle adjuster unstable when adjusting the seat back angle. Due to the lack of a corresponding pre-tightening adjustment mechanism, it is difficult for the lead screw to return to a stable state after loosening. In other words, the electric seat back angle adjuster has poor stability in later use. Summary of the Invention

[0008] The purpose of this invention is to provide a rear seat backrest angle adjustment driver for automobiles, which addresses the shortcomings of existing technologies. This rear seat backrest angle adjustment driver has a novel structural design, good stability and reliability, and good self-locking stability.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0010] A driver for adjusting the backrest angle of a car rear seat includes a drive motor, an intermediate reducer, an output screw, and a movable slider. The drive motor, intermediate reducer, and output screw are sequentially connected and driven. The movable slider has a through-hole with an internal thread corresponding to the output screw. The output screw passes through the internal thread hole of the slider and is threadedly connected to the movable slider.

[0011] The power output shaft of the drive motor and the output screw are arranged in parallel and spaced apart. The intermediate reducer includes a reducer housing. The reducer housing has a housing cavity formed inside. The housing of the drive motor is fastened to the reducer housing. The ends of the power output shaft and the output screw of the drive motor extend into the housing cavity respectively.

[0012] The power output shaft of the drive motor is equipped with a first worm gear located inside the housing cavity, and the end of the output screw is equipped with a second worm wheel located inside the housing cavity.

[0013] The housing cavity contains a first worm gear and a second worm gear arranged coaxially and rotating synchronously. The first worm gear and the second worm gear are rotatably mounted on the reducer housing via a spindle. The spindle is perpendicular to the power output shaft of the drive motor and the output screw, respectively. The first worm gear meshes with the first worm gear, and the second worm gear meshes with the second worm gear.

[0014] A screw bearing is rotatably mounted on the inner end of the output screw corresponding to the reducer housing. The inner hole of the screw bearing is a threaded hole structure, and an adjusting nut is screwed into the inner hole of the screw bearing. A nut receiving cavity is opened at the end of the adjusting nut facing the output screw. A screw wear-resistant pad is embedded in the nut receiving cavity, and the screw wear-resistant pad is in abutting contact with the end face of the inner end of the output screw.

[0015] The housing cavity contains a rotating component, which is rotatably mounted on the reducer housing via the spindle. The first worm gear is located at one end of the rotating component, and the second worm is located at the other end of the rotating component. The first worm gear and the second worm are integral structures.

[0016] The inner end face of the output screw is provided with a screw contact protrusion protruding towards the screw wear pad, and the screw wear pad and the screw contact protrusion make abutting contact.

[0017] The reducer housing includes a main housing and a cover screwed onto the main housing. The housing cavity is formed by the main housing and the cover together.

[0018] The mandrel is circumferentially limited and installed between the main housing and the housing cover. The main housing has wear-resistant pad slots on the two axial ends of the mandrel. An axial wear-resistant pad is embedded in each wear-resistant pad slot. The two axial ends of the mandrel are in contact with the axial wear-resistant pads on the corresponding sides.

[0019] The drive motor housing includes a front end cover, a middle housing, and a rear end cover connected sequentially from front to back. The front end cover is screwed and fastened to the reducer housing. The power output shaft of the drive motor passes through the front end cover and extends into the housing cavity.

[0020] The inner wall of the housing cavity is provided with a housing mounting hole facing the power output shaft. An elastic buffer pad, a front wear-resistant pad, and a front bearing are arranged sequentially from front to back in the housing mounting hole. The front end of the power output shaft extends into the housing mounting hole and is mounted on the reducer housing through the front bearing. The elastic buffer pad is in contact with the end face of the front end of the power output shaft through the front wear-resistant pad.

[0021] The rear end cover has an end cover mounting hole that opens towards the power output shaft. A rear bearing and a rear wear-resistant pad located at the rear end of the rear bearing are embedded in the end cover mounting hole. The rear end of the power output shaft extends into the end cover mounting hole and is rotatably mounted on the rear end cover via the rear bearing. The rear wear-resistant pad is in abutting contact with the end face of the rear end of the power output shaft.

[0022] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0023] 1. The intermediate reducer achieves speed reduction transmission through a first worm gear pair consisting of a first worm and a first worm wheel, and a second worm gear pair consisting of a second worm and a second worm wheel. The above-mentioned double worm gear pair combination structure can effectively improve the output torque of the drive motor, thereby effectively improving the driving thrust of the movable slider. Since each worm gear pair has a self-locking capability, the double self-locking component formed by this double worm gear pair combination structure can enable the seat back to withstand a large thrust, which will prevent the seat back from shifting under a large thrust, resulting in good stability.

[0024] 2. For the output screw, the user can rotate the adjusting nut to keep the wear pad of the screw in abutting contact with the end face of the inner end of the output screw, so as to eliminate axial loosening and restore the output screw to a stable state. This can effectively improve the axial impact resistance of the product, that is, the invention can effectively improve the stability of later use.

[0025] 3. Therefore, the rear seat back angle adjustment driver of the present invention has the advantages of novel structural design, good stability and reliability, and good self-locking stability. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is an exploded view of the present invention.

[0029] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0030] Figure 4 This is a cross-sectional view of another location in the present invention.

[0031] Figure 5 This is a cross-sectional schematic diagram of another location of the present invention.

[0032] Figure 6 This is a partial structural diagram of the present invention.

[0033] exist Figures 1 to 6 This includes:

[0034] 1-Drive motor; 11-Power output shaft; 12-Front end cover; 13-Intermediate housing; 14-Rear end cover; 141-End cover mounting hole; 2-Intermediate reducer; 21-Reducer housing; 211-Housing cavity; 212-Main housing; 2121-Wear-resistant pad slot; 213-Housing cover; 214-Housing mounting hole; 221-First worm; 222-First worm wheel; 231-Second worm; 2 32-Second worm gear; 24-Mandrel; 25-Rotating component; 3-Output screw; 31-Screw contact protrusion; 4-Modible slider; 41-Slider internal thread hole; 51-Screw bearing; 52-Adjusting nut; 521-Nut receiving cavity; 53-Screw wear-resistant pad; 6-Axial wear-resistant pad; 71-Elastic buffer pad; 72-Front wear-resistant pad; 73-Front bearing; 81-Rear bearing; 82-Rear wear-resistant pad. Detailed Implementation

[0035] The present invention will now be described in conjunction with specific embodiments.

[0036] Example 1, as Figures 1 to 6 As shown, a car rear seat backrest angle adjustment driver includes a drive motor 1, an intermediate reducer 2, an output screw 3, and a movable slider 4. The drive motor 1, the intermediate reducer 2, and the output screw 3 are sequentially connected and driven. The movable slider 4 has a through-hole 41 for the output screw 3, and the output screw 3 passes through the internal threaded hole 41 and is threadedly connected to the movable slider 4.

[0037] Among them, such as Figures 1 to 6 As shown, the power output shaft 11 of the drive motor 1 and the output screw 3 are arranged parallel and spaced apart. The intermediate reducer 2 includes a reducer housing 21. The reducer housing 21 has a housing cavity 211 formed inside. The housing of the drive motor 1 is fastened to the reducer housing 21, and the ends of the power output shaft 11 of the drive motor 1 and the output screw 3 extend into the housing cavity 211 respectively.

[0038] Furthermore, such as Figures 2 to 6 As shown, the power output shaft 11 of the drive motor 1 is equipped with a first worm gear 221 located in the housing cavity 211, and the end of the output screw 3 is equipped with a second worm wheel 232 located in the housing cavity 211.

[0039] Furthermore, such as Figures 2 to 6 As shown, the housing cavity 211 contains a first worm gear 222 and a second worm 231 arranged coaxially and rotating synchronously. The first worm gear 222 and the second worm 231 are rotatably mounted on the reducer housing 21 via a spindle 24. The spindle 24 is perpendicular to the power output shaft 11 of the drive motor 1 and the output screw 3, respectively. The first worm 221 meshes with the first worm gear 222, and the second worm 231 meshes with the second worm gear 232.

[0040] In addition, a screw bearing 51 is rotatably mounted on the inner end of the output screw 3 corresponding to the reducer housing 21. The inner hole of the screw bearing 51 is a threaded hole structure, and an adjusting nut 52 is screwed into the inner hole of the screw bearing 51. The adjusting nut 52 has a nut receiving cavity 521 at the end facing the output screw 3. A screw wear-resistant pad 53 is embedded in the nut receiving cavity 521, and the screw wear-resistant pad 53 is in abutting contact with the end face of the inner end of the output screw 3.

[0041] In the process of the movable slider 4 sliding by the rear seat back angle adjustment driver of the car in this embodiment, the drive motor 1 drives the first worm 221 to rotate through its power output shaft 11. The first worm 221 then drives the first worm wheel 222 to rotate. The second worm 231 rotates synchronously with the first worm wheel 222, and the second worm 231 drives the second worm wheel 232 to rotate. The second worm wheel 232 drives the output screw 3 to rotate. The output screw and the movable slider 4 together form a threaded transmission pair structure, that is, the rotating output screw 3 drives the movable slider 4 to slide.

[0042] It should be noted that the intermediate reducer 2 in this embodiment achieves speed reduction transmission through a first worm gear pair composed of a first worm 221 and a first worm wheel 222, and a second worm gear pair composed of a second worm 231 and a second worm wheel 232. This dual worm gear pair combination effectively increases the output torque of the drive motor 1, thereby effectively increasing the driving thrust of the movable slider 4. Furthermore, since each worm gear pair has a self-locking capability, the dual worm gear pair combination can achieve a double self-locking function. When the rear seat back angle adjustment driver of this embodiment adjusts the seat back to the desired angle position, the double self-locking component formed by this dual worm gear pair combination allows the seat back to withstand a large thrust, preventing displacement of the seat back under a large thrust and ensuring good stability.

[0043] It should be further pointed out that, in this embodiment, the spindle 24 is perpendicular to the power output shaft 11 of the drive motor 1 and the output screw 3. The power output shaft 11 of the drive motor 1, the first worm 221, the first worm wheel 222, the spindle 24, the second worm 231, the second worm wheel 232 and the output screw 3 together form a multi-stage interlaced transmission structure. This multi-stage interlaced transmission structure is compact and can effectively reduce the overall space occupied.

[0044] It should be emphasized that, for the output screw 3 in this embodiment, during operation, rotating the adjusting nut 52 allows the adjusting nut 52 to move axially relative to the screw bearing 51, thereby causing the adjusting nut 52 and the screw wear pad 53 to move axially along the output screw 3, ensuring that the screw wear pad 53 maintains abutting contact with the end face of the inner end of the output screw 3. During the use of the rear seat back angle adjustment driver of this embodiment, when the output screw 3 becomes axially loose, the user can rotate the adjusting nut 52 to maintain abutting contact between the screw wear pad 53 and the end face of the inner end of the output screw 3, thus eliminating the axial looseness and restoring the output screw 3 to a stable state. This effectively improves the axial impact resistance of the product; that is, the rear seat back angle adjustment driver of this embodiment effectively improves the stability of later use.

[0045] In summary, the rear seat backrest angle adjustment driver of this embodiment has the advantages of novel structural design, good stability and reliability, and good self-locking stability through the above structural design.

[0046] Example 2, as Figure 2 , Figure 5 as well as Figure 6 As shown, the difference between this embodiment 2 and embodiment 1 is that: a rotating component 25 is embedded in the housing cavity 211, and the rotating component 25 is rotatably mounted on the reducer housing 21 via a spindle 24. A first worm gear 222 is disposed at one end of the rotating component 25, and a second worm 231 is disposed at the other end of the rotating component 25. The first worm gear 222 and the second worm 231 are integral structures.

[0047] In this second embodiment, the first worm gear 222 and the second worm 231 are an integral structure. This integral structure design can effectively ensure the accuracy of the synchronous rotation of the first worm gear 222 and the second worm 231, and also improve the convenience of assembly.

[0048] Example 3, as Figure 4 As shown, the difference between this embodiment 3 and embodiment 1 is that: the end face of the inner end of the output screw 3 is provided with a screw contact protrusion 31 protruding toward the screw wear pad 53, and the screw wear pad 53 and the screw contact protrusion 31 are in abutting contact.

[0049] By having the screw contact protrusion 31 press against the screw wear pad 53, this embodiment can effectively reduce the contact area between the rear end of the output screw 3 and the screw wear pad 53, thereby reducing the resistance to the rotation of the output screw 3 and improving the smoothness of the rotation of the output screw 3.

[0050] Example 4, as Figures 1 to 6 As shown, the difference between this embodiment four and embodiment one is that the reducer housing 21 includes a main housing 212 and a housing cover 213 screwed onto the main housing 212. The housing cavity 211 is formed by the main housing 212 and the housing cover 213 together.

[0051] The spindle 24 is circumferentially limited and installed between the main housing 212 and the cover 213. The main housing 212 has wear-resistant pad slots 2121 on the two axial end sides of the spindle 24. An axial wear-resistant pad 6 is embedded in each wear-resistant pad slot 2121. The two axial end faces of the spindle 24 are in contact with the axial wear-resistant pads 6 on the corresponding sides.

[0052] It should be explained that the axial wear-resistant pad 6 in this embodiment 4 can be a high-strength carbon tool steel wear-resistant sheet. The two axial wear-resistant pads 6 provide axial restraint for the spindle 24. The reliability of this structure design is higher than that of the ball bearing structure, and the service life is longer.

[0053] Example 5, such as Figure 2 and Figure 3 As shown, the difference between this embodiment 5 and embodiment 1 is that the housing of the drive motor 1 includes a front end cover 12, a middle housing 13 and a rear end cover 14 connected sequentially from front to back. The front end cover 12 is screwed and fastened to the reducer housing 21. The power output shaft 11 of the drive motor 1 passes through the front end cover 12 and extends into the housing cavity 211.

[0054] The inner wall of the housing cavity 211 is provided with a housing mounting hole 214 opening towards the power output shaft 11. An elastic buffer pad 71, a front wear-resistant pad 72, and a front bearing 73 are installed in the housing mounting hole 214 in sequence from front to back. The front end of the power output shaft 11 extends into the housing mounting hole 214 and is mounted on the reducer housing 21 through the front bearing 73. The elastic buffer pad 71 is in contact with the end face of the front end of the power output shaft 11 through the front wear-resistant pad 72.

[0055] Additionally, the rear end cover 14 has an end cover mounting hole 141 that opens toward the power output shaft 11. The end cover mounting hole 141 is fitted with a rear bearing 81 and a rear wear-resistant pad 82 located at the rear end of the rear bearing 81. The rear end of the power output shaft 11 extends into the end cover mounting hole 141, and the rear end of the power output shaft 11 is rotatably mounted on the rear end cover 14 via the rear bearing 81. The rear wear-resistant pad 82 is in contact with the end face of the rear end of the power output shaft 11.

[0056] It should be noted that, due to the elasticity of the elastic buffer pad 71, the end faces of the two ends of the power output shaft 11 in this embodiment 5 are in contact with the front wear-resistant pad 72 and the rear wear-resistant pad 82 on the corresponding sides, respectively. The power output shaft 11 is limited between the front wear-resistant pad 72 and the rear wear-resistant pad 82. This structural design can effectively reduce the axial movement of the power output shaft 11 of the drive motor 1, thereby improving the stability of the drive motor 1 when it is working.

[0057] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A driver for adjusting the backrest angle of a car rear seat, comprising a drive motor (1), an intermediate reducer (2), an output screw (3), and a movable slider (4), wherein the drive motor (1), the intermediate reducer (2), and the output screw (3) are sequentially connected; the movable slider (4) has a through internal threaded hole (41) corresponding to the output screw (3), the output screw (3) passes through the internal threaded hole (41), and the output screw (3) is threadedly connected to the movable slider (4); Its features are: The power output shaft (11) of the drive motor (1) and the output screw (3) are arranged parallel to each other. The intermediate reducer (2) includes a reducer housing (21). The reducer housing (21) has a housing cavity (211) formed inside. The housing of the drive motor (1) is fastened to the reducer housing (21). The ends of the power output shaft (11) of the drive motor (1) and the output screw (3) extend into the housing cavity (211) respectively. The power output shaft (11) of the drive motor (1) is equipped with a first worm (221) located in the housing cavity (211), and the end of the output screw (3) is equipped with a second worm wheel (232) located in the housing cavity (211). The housing cavity (211) is fitted with a first worm gear (222) and a second worm (231) arranged coaxially and rotating synchronously. The first worm gear (222) and the second worm (231) are rotatably mounted on the reducer housing (21) via a spindle (24). The spindle (24) is perpendicular to the power output shaft (11) of the drive motor (1) and the output screw (3) respectively. The first worm (221) meshes with the first worm gear (222), and the second worm (231) meshes with the second worm gear (232). The reducer housing (21) is rotatably mounted with a screw bearing (51) at the inner end of the output screw (3). The inner hole of the screw bearing (51) is a threaded hole structure, and an adjusting nut (52) is screwed into the inner hole of the screw bearing (51). The adjusting nut (52) has a nut receiving cavity (521) at the end facing the output screw (3). A screw wear-resistant pad (53) is embedded in the nut receiving cavity (521). The screw wear-resistant pad (53) is in contact with the end face of the inner end of the output screw (3).

2. The rear seat backrest angle adjustment driver for automobiles according to claim 1, characterized in that: The housing cavity (211) is fitted with a rotating component (25). The rotating component (25) is rotatably mounted on the reducer housing (21) via the spindle (24). The first worm wheel (222) is located at one end of the rotating component (25), and the second worm (231) is located at the other end of the rotating component (25). The first worm wheel (222) and the second worm (231) are an integral structure.

3. The rear seat backrest angle adjustment actuator for automobiles according to claim 1, characterized in that: The inner end face of the output screw (3) is provided with a screw contact protrusion (31) protruding toward the screw wear pad (53), and the screw wear pad (53) and the screw contact protrusion (31) are in abutting contact.

4. The rear seat backrest angle adjustment actuator for automobiles according to claim 1, characterized in that: The reducer housing (21) includes a main housing (212) and a cover (213) screwed onto the main housing (212). The housing cavity (211) is formed by the main housing (212) and the cover (213). The spindle (24) is circumferentially limited and installed between the main housing (212) and the cover (213). The main housing (212) has wear-resistant pad slots (2121) on the two axial ends of the spindle (24). An axial wear-resistant pad (6) is embedded in each wear-resistant pad slot (2121). The two axial ends of the spindle (24) are in contact with the axial wear-resistant pad (6) on the corresponding side.

5. The rear seat backrest angle adjustment actuator for automobiles according to claim 1, characterized in that: The housing of the drive motor (1) includes a front end cover (12), a middle housing (13), and a rear end cover (14) connected sequentially from front to back. The front end cover (12) is screwed and fastened to the reducer housing (21). The power output shaft (11) of the drive motor (1) passes through the front end cover (12) and extends into the housing cavity (211). The inner wall of the housing cavity (211) is provided with a housing mounting hole (214) opening towards the power output shaft (11) on the corresponding power output shaft (11). The housing mounting hole (214) is fitted with an elastic buffer pad (71), a front wear-resistant pad (72) and a front bearing (73) arranged sequentially from front to back. The front end of the power output shaft (11) extends into the housing mounting hole (214) and the front end of the power output shaft (11) is mounted on the reducer housing (21) through the front bearing (73). The elastic buffer pad (71) is in contact with the end face of the front end of the power output shaft (11) through the front wear-resistant pad (72). The rear end cover (14) has an end cover mounting hole (141) that opens toward the power output shaft (11) and is located in the end cover mounting hole (141). The rear bearing (81) and the rear wear pad (82) located at the rear end of the rear bearing (81) are installed in the end cover mounting hole (141). The rear end of the power output shaft (11) extends into the end cover mounting hole (141) and the rear end of the power output shaft (11) is rotatably mounted on the rear end cover (14) through the rear bearing (81). The rear wear pad (82) is in contact with the end face of the rear end of the power output shaft (11).

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