WO2019205972A1

WO2019205972A1 - Adjustment driver for car seat

Info

Publication number: WO2019205972A1
Application number: PCT/CN2019/082658
Authority: WO
Inventors: 龚红宇; 冯臣; 杜旭; 赵振雷
Original assignee: 广东肇庆爱龙威机电有限公司
Priority date: 2018-04-26
Filing date: 2019-04-15
Publication date: 2019-10-31
Also published as: CN208101771U

Abstract

An adjustment driver (1) for a car seat, comprising a box body (2), a box cover (3) adapted to the box body (2), and a transmission apparatus. The box body (2) has a cavity accommodating the transmission apparatus; the box cover (3) is provided with at least two through holes (13); a corresponding number of bolts (12) pass through the through holes (13) and are screwed into receiving portions (18) in the box body (2), wherein the bolts (12) have heads in the shape of an inverted cone. When the box cover (3) is locked to the box body (2) by means of the bolts (12), the head conical surfaces of the bolts (12) are abutted against the edges of the through holes (13) of the box cover (3). By using the adjustment driver, on one hand, the layout and matching on a seat framework having a limited structural space become easier, and on the other hand, high mechanical strength test requirements of a seat system can also be satisfied.

Description

Adjusting drive for car seats

Cross-reference to related applications

The present application claims priority to and the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the present disclosure.

Technical field

The present application relates to a drive, and more particularly to an adjustment drive for a car seat having high mechanical strength.

Background technique

In the field of drives, especially in drive systems for seat adjustment, the transmission of power is typically achieved using two or more stages of transmission. These two-stage or multi-stage transmissions are more commonly geared, and are generally provided with corresponding gearbox assemblies for these transmissions, which typically include a case and a cover, which can typically be used Various means known in the art are locked and secured to the housing to effect closure of the housing assembly.

There are various ways of housing cover in the prior art, such as snap fastening, flange fastening, ultrasonic welding, and laser welding. However, these methods have their own shortcomings: the use of snap fastening is extremely demanding on materials, and the material with insufficient toughness is also prone to buckle breakage; the use of flange fastening has requirements for the length of the flange and is not conducive to rework; Ultrasonic welding is prone to melt-glue and affects the internal structure of the product, which makes it difficult to ensure the assembly size. Laser welding requires high transmittance of the material, and also causes the melt to affect the internal structure of the product and makes it difficult to ensure the assembly size. risk.

It will be appreciated that the housing assembly for use in a car seat adjustment drive requires a smaller overall drive size on the one hand and a reduced overall structural size in the seat frame, and on the other hand considers seat safety and flexibility. It is also necessary to meet the high mechanical strength requirements of the seat system.

At present, especially in the case of the lift of a car seat (especially the "rear lift") causing the overall lifting of the seat, the box assembly generally uses a pan head screw to fix the case and the cover, however, the cover is used. In this way, the circumferential rotation gap is often easily present between the box body and the box cover, and the rotation gap between the box body and the box cover causes the box body and the box cover to be partially separated. In this case, especially when the entire test drive is reversely applied with a higher test torque during the strength test phase, the mechanical strength of the entire assembly is greatly reduced, thereby failing to meet the high mechanical strength test requirements of the seat system.

Accordingly, there is a need to provide an adjustment drive for a car seat having a novel structure that overcomes one or more of the above problems and/or other deficiencies found in the prior art.

Summary of the invention

The present application is based on such a background and aims to provide an adjustment drive for a car seat such that it can be more easily laid out and matched on a seat frame with limited space on the one hand, and another It also meets the high mechanical strength testing requirements of the seat system.

An adjustment drive for a car seat according to the present application includes a case, a cover and a transmission adapted to the case, the case having a chamber for receiving the transmission, the cover setting There are at least two through holes through which a corresponding number of screws are screwed into the receiving portion in the case, wherein the screw has a head having an inverted cone shape, and the cover passes When the screw is locked to the case, the tapered surface of the head of the screw abuts against the edge of the through hole of the cover.

Preferably, the screw is a countersunk head tapping screw.

Preferably, the case is provided with a positioning protrusion that protrudes axially from the periphery of the case, and the cover is provided at an outer periphery thereof with the positioning protrusion when the cover is assembled on the case. gap.

Preferably, the transmission comprises a primary transmission mechanism and a secondary transmission mechanism, wherein the primary transmission mechanism comprises a worm gear and a worm meshed with each other, and the secondary transmission mechanism comprises a planetary gear transmission gear train, the planetary gear transmission gear train Includes sun gear, ring gear, planet gear and planet carrier.

Preferably, the worm wheel, the sun gear and the planet carrier are rotatably mounted on the same support shaft in the casing, one end of the support shaft is received in a bearing hole in the casing and another One end is received in a central bore of the planet carrier, the inner ring gear being fixedly received in the housing in rotation and at the same level as the sun gear; wherein the worm gear is not diametrically opposed to the sun gear Rotatingly coupled, the planet gear meshes with both the sun gear and the inner ring gear such that power of the adjustment drive is transmitted from the worm and worm gear to the planet carrier via the sun gear and planet wheels And output.

Preferably, an output gear is integrally formed on an output shaft of the carrier, and the output gear protrudes out of the cover through a central opening of the cover to further transmit power to the seat. Other transmission components.

Preferably, the tank is provided with a first chamber for receiving the worm and a second chamber for receiving the worm wheel.

Preferably, the case is provided with a recess recessed axially from the periphery of the case, the ring gear protruding radially outward from the outer periphery thereof, when the inner ring gear is assembled in the case The protrusion that the recess engages.

Preferably, the box cover is provided with a flange portion, and the flange portion is provided with at least two mounting holes through which a corresponding number of assembly bolts extend and extend into the seat frame. Inside the corresponding hole in the plate and fixed by the mounting nut

The adjustment driver for a car seat according to the present application can meet the high mechanical strength test requirement of the seat system, and the first-stage worm gear transmission mechanism has the advantages of large transmission ratio, good self-locking performance and low running noise, and the second stage. The planetary gear train has the advantages of making the seat adjustment easy to implement by decelerating and twisting.

DRAWINGS

The above and other features and advantages of the present application will become more readily understood from the following description of the appended claims.

1 is an exploded view of an adjustment drive for a car seat in accordance with the present application;

2 is a plan view of an assembled state of an adjustment driver for a car seat according to the present application; and

Figure 3 is a cross-sectional view taken along line A-A of Figure 2 .

detailed description

The present application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 shows an exploded view of an adjustment drive for a car seat according to the present application. The adjustment drive is used in particular for the lifting adjustment of a motor vehicle seat. The adjustment drive 1 for a car seat according to the present application comprises a case 2, a case cover 3 adapted to the case 2 and a transmission received in the case 2, for example as described in the specific embodiment of the present application The two-stage transmission mechanism, wherein power is input from the motor 4 via its power output shaft (not specifically shown) to the casing 2 and output via the first and second transmission mechanisms. Specifically, as shown in FIG. 1, power is transmitted from the motor 4 to the primary worm gear train and then output through the secondary planetary gear train. It should be appreciated that the secondary planetary gear train includes the sun gear 7, the inner ring gear 8, the planet gears 9, and the planet carrier 10. However, it should be understood that other suitable transmissions other than the two-stage transmission described above are also possible depending on the design requirements.

The cover 3 is provided with at least two through holes. In particular, as shown in FIG. 1, the cover 3 is provided with three through holes 13 through which a corresponding number of screws 12 pass and are screwed to the case 2. The receiving holes 18 (which may be formed in advance or may be formed during the screwing process of the screw) are used to achieve the locking and fixing of the case 2 and the cover 3.

In the prior art, a pan head screw is commonly used to lock the cover and the case. However, due to the limited tightening torque of the pan head screw, it is easy to have a circumferential turning gap between the cap and the case. The head of the pan head screw is substantially cylindrical and the bottom surface of the head fits over the upper surface of the lid, thus lacking any circumferential stops that prevent the aforementioned rotational gap. Due to the existence of the above-described turning gap, the case and the cover are partially separated, and high mechanical strength cannot be obtained. In order to overcome this problem, the present application proposes the use of a screw 12 whose head is inverted.

Referring particularly to Figure 3, when the case 2 and the cover 3 are locked by such screws 12, the conical surface of the head of the screw 12 always abuts against the edge of the through hole 13 of the cover 3, thus preventing the case 2 Any circumferential turning gap occurs between the box cover 3 and the box cover 3 so that the box body 2 and the box cover 3 are always integrated, so that the high mechanical strength test of the seat system can be satisfied.

Preferably, a countersunk head tapping screw with a reverse tapered head, such as an F-type ST4.2 countersunk head tapping screw, is used, the head hole type is a T20 hexagonal flower shape, the hole depth is 1.1 to 1.3 mm, and the tooth distance is 1.79 mm. . After locking the case 2 and the cover 3, the height of the head of the countersunk head from the periphery of the through hole 13 of the cover 3 is very small, which makes the drive easier to lay out and match on the seat frame.

Advantageously, a positioning structure is provided on the lid 3 and the box 2 to facilitate assembly of the box lid 3 with the box 2. Specifically, as shown in FIG. 1, two or more (preferably three) positioning projections 17 projecting upward in the axial direction from the periphery of the top of the casing are provided on the casing 2, and the positioning projections 17 and the casing cover are provided. The corresponding indentation 16 of the outer periphery of the outer circumference of the third periphery is aligned so that the positioning projection 17 is axially inserted through the notch 16 when the cover 3 is assembled on the case 2, thus enabling use Before the screw 12 locks the cover 3 and the case 2, the relative position between the case 2 and the cover 3 is predetermined and the mounting problem due to the misalignment is prevented. However, it will be understood by those skilled in the art that any other suitable means capable of implementing the above described positioning functions are within the scope of the present application.

A two-stage transmission mechanism is received in the interior space enclosed by the lid 3 and the box 2. As shown in Figure 1, the casing 2 is provided with a first chamber 20 for receiving the worm 5 in a first direction and for receiving in a second direction perpendicular to the first direction (i.e., axial direction A in Figure 1) The second chamber 21 of the worm wheel 6, wherein the first chamber 20 communicates with the second chamber 21 to effect the meshing transmission of the worm 5 and the worm wheel 6 (see Fig. 3). One end of the worm 5 is coupled to the power take-off shaft of the motor 4. A mounting flange is formed at the inlet of the first chamber 20, and the motor 4 is fixed to the case 2 by screwing a fastening device such as a fastening screw into a fastening hole on the mounting flange.

As shown in FIG. 3, the worm wheel 6, the sun gear 7 and the carrier 10 are rotatably mounted on the same support shaft 23 in the axial direction A from the bottom to the top, wherein the worm wheel 6 and the sun gear 7 are non-rotatably coupled (see 3, preferably, the worm wheel and the sun gear are integrally formed), one end of the support shaft 23 is received in the bearing hole in the casing 2 and the other end is received in the center hole 22 of the carrier 10, the ring gear 8 It is received within the casing 2 and is non-rotatable relative to the casing 2. The ring gear 8 is at the same level as the sun gear 7 above the worm wheel 6, so that the planet gears 9 carried on the planet carrier 10 can simultaneously mesh with the ring gear 8 and the sun gear 7.

The power is transmitted and output according to the following route: Referring to Figures 1 and 3, the power is first transmitted from the motor 4 through the power output shaft to the worm 5, and the worm 5 and the worm wheel 6 mesh with the transmission, and the worm wheel 6 and the sun gear 7 rotate synchronously around the same axis. A plurality of planetary gears 9 (for example, three) carried on the carrier 10 are meshed with both the sun gear 7 and the inner ring gear 8, so that power is finally output through the carrier 10.

As shown in FIG. 3, the carrier 10 is integrally formed with an output gear 11 which protrudes through the central opening 19 of the cover 3 to the outside of the cover 3 to further transmit power to the seat. Other transmission components. In particular, in the rear seat lift adjustment drive of the vehicle seat, the rotary motion of the output gear is finally converted into a lifting motion via a series of transmission members, thereby achieving an overall lifting of the seat.

The adjustment drive for a car seat according to the present application can be obtained by adopting a first-stage worm gear transmission mechanism and a secondary planetary gear transmission train system, in addition to making the transmission space required for the transmission device small and the structure more compact. The effect of the large gear ratio reduces the torque requirements on the motor, thus reducing the size of the motor and reducing the weight of the motor. In addition, by utilizing the self-locking property of the worm gear transmission structure, the adjusted position of the seat can be stably maintained.

It should be understood that because the worm gear has the advantages of large transmission ratio, good self-locking performance and low running noise, it is especially suitable for the relevant driving device of the car seat; in addition, the planetary gear transmission wheel train can further realize the power transmission process. The deceleration and twisting in the middle makes the seat adjustment operation easier to implement.

Referring again to Figure 1, a preferably three projections 15 projecting radially outward along the circumference of the inner ring gear 8, the projections 15 engaging a corresponding number of recesses recessed axially downward from the top periphery of the casing In this case, the inner ring gear 8 is fixed relative to the casing 2 in terms of rotation.

A top view in an assembled state of an adjustment drive for a car seat according to the present application is shown in FIG. The adjustment drive 1 is mounted as an integral part to the seat frame after being assembled as a whole. As can be seen from Fig. 2, the box cover 3 is provided with a flange portion 25 which is slightly raised upward from the mounting plane of the screw 12, and the flange portion 25 is provided with a plurality of (preferably three) mounting holes, a corresponding number of mounting bolts 24 passes through the mounting aperture and extends into a corresponding hole in a lateral mounting plate (not shown) of the seat frame and is secured by a mounting nut.

After the car seat adjustment drive is assembled, it is required to be mechanically tested. During the test, the tester applies torque (eg, 200 N·m) on the power take-off (ie, on the output gear 11) to transmit the torque to the entire tank assembly as opposed to the power transmission path previously described, due to the countersunk head The tapered face of the screw ensures that there is no circumferential rotational clearance between the casing 2 and the tank cover 3, so that the various components of the entire adjustment drive for the car seat lift remain connected together and greatly increase the mechanical strength.

It should be noted that the embodiments described above are to be considered as merely exemplary, and the application is not limited to the embodiments. Numerous changes and modifications can be made by those skilled in the art without departing from the scope of the invention. The true scope of the application is defined by the appended claims and the claims.

Claims

An adjustment drive for a car seat, comprising a case, a cover and a transmission adapted to the case, the case having a chamber for receiving the transmission, the cover being provided with at least Two through holes through which a corresponding number of screws are screwed into the receiving portion in the case, wherein the screw has a head having an inverted cone shape, and the cover is passed When the screw is locked to the case, the tapered surface of the head of the screw abuts against the edge of the through hole of the cover.
The adjustment drive of claim 1 wherein said screw is a countersunk head tapping screw.
The adjustment drive according to claim 2, wherein said case is provided with a positioning projection projecting axially from a periphery of the case, and said cover is provided at its outer periphery with the cover being assembled at A notch that engages the positioning projection when the case is on.
The adjustment drive according to claim 3, wherein said transmission comprises a primary transmission mechanism and a secondary transmission mechanism, wherein the primary transmission mechanism includes a worm gear and a worm meshed with each other, and the secondary transmission mechanism includes a planetary gear A transmission gear train including a sun gear, an inner ring gear, a planet gear, and a planet carrier.
The adjustment drive according to claim 4, wherein said worm wheel, said sun gear and said planet carrier are rotatably mounted on said same support shaft in said housing, and one end of said support shaft is received at a bearing bore in the housing and the other end being received in a central bore of the planet carrier, the inner ring gear being fixedly received in the housing in rotation and at the same level as the sun gear;

Wherein the worm wheel is coupled to the sun gear in a rotationally fixed manner, the planet gear meshing with both the sun gear and the inner ring gear such that the power of the adjustment drive is from the worm and the worm gear The sun gear and the planet gear are transmitted to the planet carrier and output.
The adjustment drive according to claim 5, wherein an output gear is integrally formed on an output shaft of the carrier, and the output gear protrudes to the outside of the cover via a central opening of the cover To further transfer power to other transmission components on the seat.
The adjustment drive according to any one of claims 4 to 6, wherein the case is provided with a first chamber for receiving the worm and a second chamber for receiving the worm wheel.
The adjustment actuator according to claim 5 or 6, wherein the casing is provided with a recess recessed in the axial direction from the periphery of the casing, and the ring gear protrudes radially outward from the outer periphery thereof. A projection that engages the recess when the ring gear is assembled in the housing.
The adjustment drive according to any one of claims 1 to 6, wherein the cover is provided with a flange portion, the flange portion is provided with at least two mounting holes, and a corresponding number of mounting bolts Through the mounting hole and into the corresponding hole in the lateral mounting plate of the seat frame and fixed by the mounting nut.