WO2015161714A1 - 汽车座椅的电动水平调节装置中的塑料蜗杆 - Google Patents

汽车座椅的电动水平调节装置中的塑料蜗杆 Download PDF

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Publication number
WO2015161714A1
WO2015161714A1 PCT/CN2015/073180 CN2015073180W WO2015161714A1 WO 2015161714 A1 WO2015161714 A1 WO 2015161714A1 CN 2015073180 W CN2015073180 W CN 2015073180W WO 2015161714 A1 WO2015161714 A1 WO 2015161714A1
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Prior art keywords
worm
plastic worm
ribs
groove
grooves
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PCT/CN2015/073180
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English (en)
French (fr)
Inventor
黎其俊
王晶晶
常健
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上海延锋江森座椅有限公司
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Publication of WO2015161714A1 publication Critical patent/WO2015161714A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears

Definitions

  • the invention relates to a car seat design technology, in particular to a plastic worm in an electric level adjusting device of a car seat.
  • the horizontal drive mechanism in the electric slide used in the passenger car seat mainly uses a horizontal motor to drive the worm gear reducer system to achieve a comfortable ride position for the driver or passenger.
  • Almost all horizontal screw drive mechanisms on the market are more or less faced with problems such as jitter, high noise and low transmission efficiency.
  • Plastic worm gear + metal worm drive The biggest disadvantage of this type of structure is that during operation, due to the large force and torque of the plastic worm wheel, the required strength is large, resulting in a large volume of the worm wheel. Moreover, the axis of the worm wheel coincides with the axis of the screw rod, the worm wheel needs to absorb the static strength of 25kN, and the metal worm wheel needs to increase the metal gasket to prevent impact.
  • the motor and the worm are the first-stage transmission, so the cooperation of the worm and the flexible shaft is the key to solving the problems of loud noise and obvious jitter.
  • the material used in the driving worm 10 is PEEK material
  • the polyetheretherketone (PEEK) is a high temperature resistant thermoplastic.
  • High glass transition temperature (143 ° C) and melting point (334 ° C), load thermal deformation temperature up to 316 ° C, can be used at 260 ° C for a long time, PEEK resin not only heat resistance ratio
  • Other high temperature resistant plastics are excellent in high strength, high modulus, high fracture toughness and excellent dimensional stability. Due to the characteristics of PEEK, the temperature of PEEK is over 180 degrees Celsius during demolding, and the material adhesion is large.
  • the driving worm 10 is constructed such that a stripping chamber 22 is provided between the sliding surface 27 and the worm shaft, which axially projects into the driving worm 10, wherein the stripping chamber 22 is disposed to be deepened relative to the sliding surface 27. Within the plane 29, and separated by ribs 28.
  • the transition region of the plane of the sliding surface 27 and the plane 29 of the stripping chamber 22 with the ribs 28 is formed by an annular chamfer 23, here forming an angle of between 20 and 60 with the sliding surface 27, from the sliding surface
  • the plane of the 27 plane to the plane of the demolding chamber 22 is between 0.1 mm and 2 mm.
  • the drive worm 10 has an inner quadrilateral bore 24 in the axial direction which projects axially from the drive worm 10 and is adapted, for example, to mount a flexible drive shaft, in the illustrated case each inner surface 20 of the inner quadrilateral bore 24 has two The parallel axially distributed grooves 25 are arranged such that they simultaneously form a pressing rib 26 at the center of an inner surface 20, respectively, by means of which the flexible shaft can be fixed without play.
  • the axially distributed grooves 25 themselves can be used in addition to the stripping chamber 22 as a corresponding possibility of correspondingly forming when the drive worm 10 is unscrewed from the mould.
  • the shaft 3 and the flexible shaft 3 gradually generate a gap during the rotation, and finally the degree of freedom is determined by means of the four corners 20a of the inner quadrangular hole 24, and then the four corners 20a are gradually worn, causing the flexible shaft 3 to break the inner quadrangular hole.
  • the shape of 24 eventually rounds the hole. There is no transmission power between the flexible shaft 3 and the drive worm 10.
  • the technical problem to be solved by the present invention is to provide a plastic worm in an electric level adjusting device for a car seat having a long service life in view of the problem of short life of the above-mentioned driving worm.
  • the plastic worm in the electric level adjusting device of the automobile seat is injection-molded by a PEEK material, and the plastic worm protrudes axially from an axial end, and the shaft end has an inner quadrangular hole connected to the flexible shaft, wherein Providing at least one parallel axially-distributed groove and at least two parallel axially-distributed extruded ribs on at least one inner surface of the inner quadrangular hole, the groove between the two extruded ribs having a depth less than The depth of the two outer grooves of the outer two extruded ribs, the width of the groove between the two pressing ribs is larger than the width of the two outer grooves of the outer two outer ribs, and the outer two outer ribs The shape, depth and width of the grooves are the same.
  • the number of pressing ribs in the inner quadrangular hole is 6-12.
  • annular boss is disposed on the outer periphery of the shaft end and the end surface of the plastic worm, and an annular groove is formed on the inner side of the annular boss, and the groove bottom of the annular groove is
  • the cloth has a number of mold release cavities.
  • annular boss is disposed on an outer surface of the shaft end and an end surface of the plastic worm, and a vertically descending annular surface is disposed on an outer side of the annular boss.
  • stripping cavities evenly distributed.
  • the mold release cavity is one of a circle, an ellipse, a semicircle, a square, a rectangle, a triangle, or a polygon.
  • the inner surface of the inner quadrangular hole of the present invention is provided with two parallel axially distributed pressing ribs, so that when the flexible shaft is installed into the inner quadrangular hole, the inner quadrangular hole At least two extrusion paths on one inner surface can effectively prevent the sliding between the flexible shaft and the plastic worm hole to make the transmission smoother, and also prevent the pressing rib from being worn, thereby prolonging the service life of the driving worm.
  • a demolding cavity is provided on the inner side or the outer side of the annular boss, and the releasing force is larger and the driving worm is not damaged.
  • FIG. 1 is a schematic structural view of a conventional drive worm.
  • Figure 2 is a schematic diagram of the force analysis between the existing drive worm and the flexible shaft.
  • Figure 3 is a schematic exploded view of the worm gear reducer of the present invention.
  • FIG. 4 is a perspective view showing the structure of a driving worm according to the present invention.
  • Figure 5 is a schematic side view of the drive worm shown in Figure 4.
  • Fig. 6 is an enlarged schematic view showing the inner quadrangular hole in the driving worm shown in Fig. 4.
  • Figure 7 is a schematic view of the end face of the drive worm shown in Figure 4.
  • Fig. 8 is a cross-sectional view taken along line A-A of Fig. 7;
  • Figure 9 is a schematic view showing the connection of an inner quadrangular hole and a flexible shaft in a driving worm according to the present invention.
  • Figure 10 is a perspective view showing the structure of another driving worm of the present invention.
  • Figure 11 is a perspective view showing the structure of another driving worm according to the present invention.
  • Figure 12 is a perspective view showing the structure of still another driving worm of the present invention.
  • the horizontal drive mechanism in the electric slide used in the passenger car seat mainly uses a horizontal motor to drive the worm gear reducer system to achieve a comfortable ride position for the driver or passenger. See Figure 3, worm gear
  • the worm gearbox comprises two half-shells 110, 120, a drive worm 200, and a worm gear 300.
  • the two half-shells 110, 120 are combined into one box, and the shaft ends 210 and 220 of the two ends of the driving worm 200 are arranged in two halves.
  • the shaft ends 310, 320 at both ends of the worm wheel 300 are supported by the semicircular holes 112, 122, 113 of the two half casings 110, 120 through the two support rings 410, 420, 123.
  • the drive worm 200 meshes with the worm wheel to transmit power.
  • the driving worm 200 is a plastic worm which is injection molded by a PEEK material.
  • the plastic worm has an inner quadrangular hole 211 connected to the flexible shaft in an axial end 210 protruding in the axial direction, and the inner quadrangular hole 211 is formed.
  • the four inner surfaces 2111 are provided with three parallel axially distributed grooves 2111a, 2111b, 2111c and two parallel axially distributed pressing ribs 2111d, 2111e, between the two extruded ribs 2111d, 2111e.
  • the depth of the groove 2111b is smaller than the depths of the two grooves 2111a, 2111c outside the two pressing ribs 2111d, 2111e, and the width of the groove 2111b between the two pressing ribs 2111d, 2111e is larger than the two pressing ribs 2111d, 2111e
  • the widths of the two outer grooves 2111a and 2111c are the same, and the shapes, depths and widths of the two outer grooves 2111a and 2111c of the two pressing ribs 2111d and 2111e are the same.
  • the number of pressing ribs on the four inner surfaces 2111 of the inner quadrangular hole 211 is eight.
  • the torque of the flexible shaft 500 when the motor rotates is 0.4 Nm to 0.5 Nm.
  • the two pressing ribs 2111d, 2111e on one inner surface 211 of the inner quadrangular hole 211 can effectively prevent the sliding between the flexible shaft 500 and the inner quadrangular hole 211 of the shaft end 210 of the driving worm 200 to make the transmission smoother, and also The pressing ribs 2111d, 2111e are not worn, which prolongs the service life of the driving worm 200.
  • annular boss 230 is disposed on the outer periphery of the shaft end 210 and the end surface of the driving worm 200.
  • An annular groove 240 is formed on the inner side of the annular boss 230, and is uniformly distributed on the groove bottom of the annular groove 240.
  • the release cavity 241 is a semi-circular release cavity.
  • the drive worm 200 is shown and the drive worm 200 shown in Figures 4-8.
  • the difference is that an annular boss 230 is disposed on the outer periphery of the shaft end 210 and the end surface of the driving worm 200, and a vertically descending annular surface 250 is disposed on the outer side of the annular boss 230, and a plurality of demoldings are uniformly distributed on the annular surface 250.
  • the mold release chamber 251 is a semi-circular mold release chamber.
  • the driving worm 200 shown in the drawing is different from the driving worm 200 shown in Figs. 4 to 8 in that an annular boss 230 is disposed on the outer periphery of the shaft end 210 and the end surface of the driving worm 200.
  • the outer side of the table 230 is provided with a vertically descending annular surface 250, and a plurality of stripping chambers 251a are evenly distributed on the annular surface 250.
  • the mold release chamber 251a is a triangular mold release chamber.
  • annular boss 230 is disposed on the outer periphery of the shaft end 210 and the end surface of the driving worm 200.
  • the outer side of the table 230 is provided with a vertically descending annular surface 250, and a plurality of stripping chambers 251b are evenly distributed on the annular surface 250.
  • the mold release chamber 251b is composed of a lace-shaped notched portion.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)
  • Gears, Cams (AREA)
  • Gear Transmission (AREA)

Abstract

一种汽车座椅的电动水平调节装置中的塑料蜗杆（200），采用PEEK材料注塑成型，该塑料蜗杆（200）沿轴向突出一轴端（210），所述轴端（210）内具有一与软轴（500）连接的内四边形孔（211），在内四边形孔（211）的至少一个内表面（2111）设置有至少三条平行的轴向分布的槽（2111a，2111b，2111c）和至少两条平行的轴向分布的挤压凸筋（2111d，2111e），两条挤压凸筋（2111d，2111e）之间的槽（2111b）的深度小于两条挤压凸筋（2111d，2111e）外侧两条槽（2111a，2111c）的深度，两条挤压凸筋（2111d，2111e）之间的槽（2111b）的宽度大于两条挤压凸筋（2111d，2111e）外侧两条槽（2111a，2111c）的宽度，两条挤压凸筋（2111d，2111e）外侧两条槽（2111a，2111c）的形状、深度和宽度均相同。当软轴（500）安装到内四边形孔（211）内后，内四边形孔（211）的一个内表面（2111）上的至少两个挤压凸筋（2111d，2111e）能有效地防止软轴（500）和塑料蜗杆孔之间的滑动使传动更平稳，同时减少了挤压凸筋（2111d，2111e）的磨损，延长了驱动蜗杆（200）的使用寿命。

Description

汽车座椅的电动水平调节装置中的塑料蜗杆 技术领域
本发明涉及汽车座椅设计技术，尤其涉及一种汽车座椅的电动水平调节装置中的塑料蜗杆。
背景技术
乘用车座椅所使用的电动滑道中的水平传动机构，主要采用水平马达驱动蜗轮蜗杆减速箱系统来使驾驶员或乘客达到舒适的乘坐位置。几乎市场上的所有水平丝杆传动机构都或多或少面临运行有抖动，噪音大，传动效率低等问题。
目前市场上使用的水平丝杆传动机构一般采用以下两种减速箱：
1.塑料蜗轮+金属蜗杆传动。这种结构存在的最大缺点在于：运行中，由于塑料蜗轮承受的力和扭矩大，所需要的强度大，导致蜗轮的体积大。并且，蜗轮轴线与丝杆的轴线重合，蜗轮需要吸收25kN的静强度，塑料蜗轮两侧还需增加金属垫片防冲击。
2.金属蜗轮+塑料蜗杆传动。这种结构的缺点在于：塑料蜗杆需要承受一定的扭矩，还需通过耐久试验，对材料的要求高。
在丝杆水平调节机构中，马达和蜗杆是一级传动，因此蜗杆和软轴的配合是解决噪音大、抖动明显等问题的关键所在。
中国专利授权公告号CN100554729C公开的用于汽车中的调整装置的传动机构，参见图1其中的驱动蜗杆10所使用的材质为PEEK材质，聚醚醚酮(PEEK)属耐高温热塑性塑料，具有较高的玻璃化转变温度(143℃)和熔点(334℃)，负载热变型温度高达316℃，可在260℃下长期使用，PEEK树脂不仅耐热性比 其他耐高温塑料优异，而且具有高强度、高模量、高断裂韧性以及优良的尺寸稳定性；由于PEEK的特性，PEEK在脱模时温度达到180摄氏度以上，材料粘附性大，需要既要符合零件设计又要符合注塑工艺的脱模腔，使零件最高效并完整地从模具旋出。参见图1，该驱动蜗杆10的结构是在滑动面27和蜗杆轴线之间设有脱模腔22，它们轴向伸入驱动蜗杆10，其中脱模腔22设置在一相对于滑动面27加深的平面29内，并且通过筋28相互隔开。滑动面27的平面与带有筋28的脱模腔22的平面29的过渡区域由一环形倒角23构成，这里与滑动面27形成一20°至60°之间的夹角，从滑动面27平面到脱模腔22平面的加深在0.1mm至2mm之间。驱动蜗杆10沿轴向具有一内四边形孔24，它从驱动蜗杆10轴向突出，并适合于例如安装一柔性驱动轴，在所示情况下内四边形孔24的各内表面20分别具有两条平行的轴向分布的槽25，它们这样设置，使它们分别同时在一个内表面20的中心形成一挤压凸筋26，借助于挤压凸筋26可以无间隙地固定软轴。轴向分布的槽25本身可以除脱模腔22之外用作将驱动蜗杆10从模具中旋出时相应地形成的对应嵌入的可能性。
但是图1中的驱动蜗杆10存在以下问题：参见图2，由于驱动蜗杆10是通过四条挤压凸筋26来固定软轴3的，内四边形孔24的每个内表面20只有一条挤压凸筋26，而软轴3在电机旋转时的扭矩为0.4Nm～0.5Nm。每个挤压凸筋26所受到的力矩为F0*L0，4条挤压凸筋所承受的力矩为4*F0*L0＝0.4Nm～0.5Nm，这样一条挤压凸筋26不能完全固定软轴3，软轴3在转动过程中逐渐产生间隙，最终借助于内四边形孔24中的四个转角处20a确定自由度，之后四个转角处20a会逐渐磨损，致软轴3破坏内四边形孔24的形状，最终使孔磨损变圆。软轴3与驱动蜗杆10之间无法传动动力。
发明内容
本发明所要解决的技术问题在于针对上述驱动蜗杆所存在的使用寿命短的问题而提供一种使用寿命长的汽车座椅的电动水平调节装置中的塑料蜗杆。
本发明所要解决的技术问题可以通过以下技术方案来实现：
汽车座椅的电动水平调节装置中的塑料蜗杆，采用PEEK材料注塑成型，该塑料蜗杆沿轴向突出一轴端，所述轴端内具有一与软轴连接的内四边形孔，其特征在于，在所述内四边形孔的至少一个内表面设置有至少三条平行的轴向分布的槽和至少两条平行的轴向分布的挤压凸筋，两条挤压凸筋之间的槽的深度小于外侧两条挤压凸筋外侧两条槽的深度，两条挤压凸筋之间的槽的宽度大于外侧两条挤压凸筋外侧两条槽的宽度，外侧两条挤压凸筋外侧两条槽的形状、深度和宽度均相同。
在本发明的一个优选实施例中，所述内四边形孔内的挤压凸筋的数量为6-12条。
在本发明的一个优选实施例中，在所述轴端的外围、塑料蜗杆的端面上设置有一环形凸台，在所述环形凸台的内侧具有一环形槽，在所述环形槽的槽底均布有若干脱模腔。
在本发明的一个优选实施例中，在所述轴端的外围、塑料蜗杆的端面上设置有一环形凸台，在所述环形凸台的外侧设置有一垂直下降的环面，在所述环面上均布有若干脱模腔。
所述脱模腔为圆形、椭圆形、半圆形、方形、矩形、三角形或多边形中的一种。
由于采用了如上的技术方案，本发明在内四边形孔的各内表面设置有两条平行的轴向分布的挤压凸筋，这样当软轴安装到内四边形孔内后，内四边形孔 的一个内表面上的至少两个挤压途径能有效地防止软轴和塑料蜗杆孔之间的滑动使传动更平稳，同时也使得挤压凸筋不会磨损，延长了驱动蜗杆的使用寿命。另外通过在轴端的外围、塑料蜗杆的端面上设置有一环形凸台，在环形凸台的内侧或外侧设置脱模腔，其脱模力更大且不会损伤驱动蜗杆。
附图说明
图1为现有驱动蜗杆的结构示意图。
图2为现有驱动蜗杆与软轴之间的受力分析示意图。
图3为本发明的蜗轮蜗杆减速箱的爆炸示意图。
图4为本发明一种驱动蜗杆的结构立体示意图。
图5为图4所示的驱动蜗杆的端面示意图。
图6为图4所示的驱动蜗杆中内四边形孔的放大示意图。
图7为图4所示的驱动蜗杆一半的端面示意图。
图8为图7的A-A剖视图。
图9为本发明一种驱动蜗杆中的内四边形孔与软轴的连接示意图。
图10为本发明另外一种驱动蜗杆的结构立体示意图。
图11为本发明又一种驱动蜗杆的结构立体示意图。
图12为本发明再一种驱动蜗杆的结构立体示意图。
具体实施方式
以下结合附图和具体实施方式来进一步描述本发明。
乘用车座椅所使用的电动滑道中的水平传动机构，主要采用水平马达驱动蜗轮蜗杆减速箱系统来使驾驶员或乘客达到舒适的乘坐位置。参见图3，蜗轮 蜗杆减速箱包括两个半箱体110、120、驱动蜗杆200、蜗轮300，两个半箱体110、120组合成一个箱体，驱动蜗杆200两端的轴端210、220轴设在两个半箱体110、120上的轴孔111、121内，蜗轮300两端的轴端310、320通过两个支撑环410、420支撑在两个半箱体110、120的半圆孔112、122、113、123中。驱动蜗杆200与蜗轮啮合传递动力。
参见图4至图8，驱动蜗杆200为塑料蜗杆，采用PEEK材料注塑成型，该塑料蜗杆在沿轴向突出一个轴端210内开设有一与软轴连接的内四边形孔211，在内四边形孔211的四个内表面2111设置有三条平行的轴向分布的槽2111a、2111b、2111c和两条平行的轴向分布的挤压凸筋2111d、2111e，两条挤压凸筋2111d、2111e之间的槽2111b的深度小于两条挤压凸筋2111d、2111e外侧两条槽2111a、2111c的深度，两条挤压凸筋2111d、2111e之间的槽2111b的宽度大于两条挤压凸筋2111d、2111e外侧两条槽的2111a、2111c宽度，两条挤压凸筋2111d、2111e外侧两条槽2111a、2111c的形状、深度和宽度均相同。这样内四边形孔211的四个内表面2111上的挤压凸筋的数量为8条。
参见图9，当软轴500插入到驱动蜗杆200的轴端210的内四边形孔211中后，软轴500在电机旋转时的扭矩为0.4Nm～0.5Nm。内四边形孔211的一个内表面211上2条挤压凸筋2111d、2111e能有效地防止软轴500和驱动蜗杆200的轴端210的内四边形孔211之间的滑动使传动更平稳，同时也使得挤压凸筋2111d、2111e不会磨损，延长了驱动蜗杆200的使用寿命。
继续参见图4至图8，在轴端210的外围、驱动蜗杆200的端面上设置有一环形凸台230，在环形凸台230的内侧具有一环形槽240，在环形槽240的槽底均布有若干脱模腔241。脱模腔241为半圆形脱模腔。
参见图10，图中所示的驱动蜗杆200与图4至图8所示的驱动蜗杆200 的区别是在轴端210的外围、驱动蜗杆200的端面上设置有一环形凸台230，在环形凸台230的外侧设置有一垂直下降的环面250，在环面250上均布有若干脱模腔251。脱模腔251为半圆形脱模腔。
参见图11，图中所示的驱动蜗杆200与图4至图8所示的驱动蜗杆200的区别是在轴端210的外围、驱动蜗杆200的端面上设置有一环形凸台230，在环形凸台230的外侧设置有一垂直下降的环面250，在环面250上均布有若干脱模腔251a。脱模腔251a为三角形脱模腔。
参见图12，图中所示的驱动蜗杆200与图4至图8所示的驱动蜗杆200的区别是在轴端210的外围、驱动蜗杆200的端面上设置有一环形凸台230，在环形凸台230的外侧设置有一垂直下降的环面250，在环面250上均布有若干脱模腔251b。脱模腔251b由花边形的缺口部分构成。

Claims (5)

  1. 汽车座椅的电动水平调节装置中的塑料蜗杆，采用PEEK材料注塑成型，该塑料蜗杆沿轴向突出一轴端，所述轴端内具有一与软轴连接的内四边形孔，其特征在于，在所述内四边形孔的至少一个内表面设置有至少三条平行的轴向分布的槽和至少两条平行的轴向分布的挤压凸筋，两条挤压凸筋之间的槽的深度小于外侧两条挤压凸筋外侧两条槽的深度，两条挤压凸筋之间的槽的宽度大于外侧两条挤压凸筋外侧两条槽的宽度，外侧两条挤压凸筋外侧两条槽的形状、深度和宽度均相同。
  2. 如权利要求1所述的汽车座椅的电动水平调节装置中的塑料蜗杆，其特征在于，所述内四边形孔内的挤压凸筋的数量为6-12条。
  3. 如权利要求1所述的汽车座椅的电动水平调节装置中的塑料蜗杆，其特征在于，在所述轴端的外围、塑料蜗杆的端面上设置有一环形凸台，在所述环形凸台的内侧具有一环形槽，在所述环形槽的槽底均布有若干脱模腔。
  4. 如权利要求1所述的汽车座椅的电动水平调节装置中的塑料蜗杆，其特征在于，在所述轴端的外围、塑料蜗杆的端面上设置有一环形凸台，在所述环形凸台的外侧设置有一垂直下降的环面，在所述环面上均布有若干脱模腔。
  5. 如权利要求1或2所述的汽车座椅的电动水平调节装置中的塑料蜗杆，其特征在于，所述脱模腔为圆形、椭圆形、半圆形、方形、矩形、三角形或多边形中的一种。
PCT/CN2015/073180 2014-04-24 2015-02-16 汽车座椅的电动水平调节装置中的塑料蜗杆 WO2015161714A1 (zh)

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US11760233B2 (en) 2019-02-20 2023-09-19 Fisher & Company, Incorporated Ultra-compact power length adjuster with anti-back drive capability and pinion-rack output for a vehicle seat
US11485255B2 (en) 2020-05-01 2022-11-01 Fisher & Company, Incorporated Gearbox for vehicle seat adjustment mechanism
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