WO2017206569A1 - 齿轮箱总成以及包括该齿轮箱总成的头枕驱动器 - Google Patents

齿轮箱总成以及包括该齿轮箱总成的头枕驱动器 Download PDF

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Publication number
WO2017206569A1
WO2017206569A1 PCT/CN2017/076920 CN2017076920W WO2017206569A1 WO 2017206569 A1 WO2017206569 A1 WO 2017206569A1 CN 2017076920 W CN2017076920 W CN 2017076920W WO 2017206569 A1 WO2017206569 A1 WO 2017206569A1
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WO
WIPO (PCT)
Prior art keywords
gearbox assembly
screw
cover
worm
headrest
Prior art date
Application number
PCT/CN2017/076920
Other languages
English (en)
French (fr)
Inventor
宋仲明
黎爱兴
Original Assignee
广东肇庆爱龙威机电有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 广东肇庆爱龙威机电有限公司 filed Critical 广东肇庆爱龙威机电有限公司
Priority to EP17805514.1A priority Critical patent/EP3466752B1/en
Priority to KR1020187037320A priority patent/KR102177606B1/ko
Priority to MX2018014815A priority patent/MX2018014815A/es
Priority to US16/305,350 priority patent/US11261949B2/en
Publication of WO2017206569A1 publication Critical patent/WO2017206569A1/zh

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    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/039—Gearboxes for accommodating worm gears
    • 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
    • F16H25/2015—Means specially adapted for stopping actuators in the end position; Position sensing means
    • 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
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/809—Head-rests movable or adjustable vertically slidable
    • B60N2/829—Head-rests movable or adjustable vertically slidable characterised by their adjusting mechanisms, e.g. electric motors
    • 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
    • B60N2/80—Head-rests
    • 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
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • 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
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B60N2/02253—Electric motors therefor characterised by the transmission between the electric motor and the seat or seat parts
    • 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
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/838—Tiltable
    • B60N2/853—Tiltable characterised by their adjusting mechanisms, e.g. electric motors
    • 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
    • B60N2/80—Head-rests
    • B60N2/806—Head-rests movable or adjustable
    • B60N2/865—Head-rests movable or adjustable providing a fore-and-aft movement with respect to the occupant's head
    • 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
    • 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
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • 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
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/09—Reducing noise
    • 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
    • F16H2025/2031—Actuator casings
    • 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
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2084—Perpendicular arrangement of drive motor to screw axis
    • 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
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/209—Arrangements for driving the actuator using worm gears
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02021—Gearboxes; Mounting gearing therein with means for adjusting alignment
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02082—Gearboxes for particular applications for application in vehicles other than propelling, e.g. adjustment of parts
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213—Support of worm gear shafts
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H57/022—Adjustment of gear shafts or bearings
    • F16H2057/0221—Axial adjustment
    • 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
    • F16H57/00—General details of gearing
    • F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
    • F16H2057/125—Adjustment of backlash during mounting or assembly of gearing
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes

Definitions

  • the present invention relates to the field of drives, and more particularly to gearbox assemblies for drives. Furthermore, the invention relates to a headrest drive comprising the above described gearbox assembly.
  • a headrest drive generally includes a transmission mechanism having a worm-screw and a headrest lifting seat, a power mechanism having a worm, and a headrest mechanism, the headrest mechanism being coupled to the transmission mechanism such that the headrest can be The lifting movement is performed to realize the vertical position adjustment of the headrest.
  • the gearbox assembly for the headrest drive tends to have undesired relative collisions between the components due to the uncontrolled mating clearance between the various transmission components during operation.
  • the present invention has been made based on such a background and is intended to provide a tight structure
  • a gearbox assembly with a small lead screw and low noise running is provided to provide a seat user with greater comfort when adjusting the headrest.
  • a first aspect of the invention provides a gearbox assembly including a case, a cover, a lead screw inserted through the case in a first direction, a worm wheel integrally formed on the lead screw, and a worm disposed in the casing in a second direction perpendicular to the first direction, the worm being meshed with the worm wheel, wherein the worm is driven to rotate by a drive shaft, thereby causing the worm to drive the worm wheel and the screw rod through the motion pair Rotating together, the screw rod moves the lifting mechanism attached to the screw rod up and down by a screw drive, wherein the box body is further provided with a stopper plug, and the stopper plug is arranged on the driving shaft of the worm shaft The free end of the extension line is in contact with the free end of the drive shaft.
  • the stop plug is made of a plastic material and the stop plug is threadedly fastened to the case.
  • At least two positioning mounting holes for mounting the gearbox assembly to the fixed support are also provided, the positioning mounting holes being arranged only on the casing.
  • the mounting plane of the positioning mounting hole is higher than the upper surface of the box cover.
  • the mounting plane of the positioning mounting hole is 0.5-1 mm higher than the upper surface of the box cover.
  • the front end of the lead screw is passed out of the housing, the rear end of which is situated in the housing and facing the cover, wherein the screw A stop means is disposed between the rear end and the inner surface of the cover.
  • the stop means comprise a plastic spacer and a rubber pad.
  • cover and the case in the gear case assembly according to the embodiment of the present invention are respectively provided with a cover bush and a case bush for rotatably supporting the screw.
  • a second aspect of the invention provides a headrest drive comprising the above described gearbox assembly.
  • the noise generated when the headrest is adjusted by the headrest driver according to the present invention is not more than 40 dBA, which makes it possible to ensure the best comfort of the seat user when adjusting the headrest.
  • FIG. 1 is an exploded view of a gearbox assembly according to an embodiment of the present invention (a worm is not shown);
  • Figures 2a-2b show the box bushings mounted in the box in perspective and cross-sectional views, respectively;
  • Figures 2c-2d show the box cover linings mounted in the box cover in perspective and cross-sectional views, respectively set;
  • Figure 3 shows a worm gear transmission mechanism in an embodiment of the invention
  • Figure 4a shows an assembly view of a worm-spin subassembly (the rear end of a screw is covered with a plastic material) in accordance with an embodiment of the present invention
  • Figure 4b shows a worm-thread subassembly assembly in accordance with an advantageous embodiment of the present invention.
  • Figure (the rear end of the screw is not covered with plastic material);
  • Figure 5 is a schematic view showing the structure of the screw, wherein A is the position of the worm wheel covering;
  • Figure 6a shows a schematic view of the installation of the case and the cover in the gearbox assembly according to the prior art
  • Figure 6b shows the case and the cover in the gearbox assembly according to an advantageous embodiment of the invention. Installation diagram
  • Figures 7a-7c show schematic views of the play control of the motor shaft
  • Fig. 8 is a view showing a state in which the play of the rear end of the screw is controlled by the play control device.
  • a gearbox assembly 1 is illustrated in accordance with an embodiment of the present invention, and by way of example, the gearbox assembly 1 can be used in a headrest driver of a car seat and cooperates with a headrest mechanism to effect a headrest Vertical position adjustment. More specifically, the gearbox assembly 1 includes a case 2, a cover 3, a lead screw 4 inserted through the case 2 in a first direction, and a worm wheel 5 integrally formed on the lead screw 4, And a worm 6 (see FIG. 3) arranged in the casing 2 in the second direction, and the worm 6 is meshed with the worm wheel 5. It can be understood that the first direction and the second direction are preferably in a mutually perpendicular relationship.
  • the gearbox assembly for use in a headrest drive achieves a longitudinal lift function of the headrest by the following motion transmission: the worm 6 is rotated by a drive shaft (preferably a motor shaft 8); the worm 6 is integrally driven by the motion pair
  • the worm gear 5 rotates together with the lead screw 4, wherein the worm gear 5 and the screw shaft 4 can be integrally formed by any suitable means known in the art; then, the screw shaft 4 is attached to the screw shaft 4 by a screw drive
  • the upper headrest lifting mechanism moves up and down, thereby Achieve vertical position adjustment of the headrest.
  • the casing 2 and the casing 3 as two separate components can be fixed to one another by means of screwing or other suitable means known in the art.
  • the case 2 and the cover 3 are fastened to each other by three fastening screws 7, as shown in FIG.
  • the fastening screw 7 is preferably a self-tapping screw, such as ST 3.0 x 1.27.
  • a casing bushing 9 for rotatably supporting the screw shaft 4 is provided in the gearbox assembly 1, wherein the screw rod 4 inserted through the casing 2 extends into the tank cover In the non-through screw receiving hole of 3, the cover 3 can directly support the screw rod through the screw receiving hole.
  • the cover 3 can directly support the screw rod through the screw receiving hole.
  • the wear of the screw is serious, and the rear end 11 of the screw is advantageously coated with a wear-resistant plastic material (as shown in Fig. 4a). Show), this plastic coating will greatly reduce the wear of the screw during use.
  • the plastic material coated on the screw is worn out, it is also convenient to replace the screw with a new plastic coating.
  • the invention also proposes a further advantageous embodiment, in this advantageous embodiment, optionally as shown in Figures 2a-2d, except that a box liner 9 is provided in the casing 2 A cover bushing 10 is additionally provided in the cover 3 for rotatably supporting the lead screw 4, respectively.
  • the case bushing 9 and the cover bushing 10 may be separate members, for example, injection molded from wear-resistant plastic, press-fitted into corresponding mounting holes; or may be integrally formed with the case or cover by overmolding. Form the ground or set it in any other suitable way.
  • the case bushing 9 and the cover bushing 10 can be made, for example, of a material that is wear resistant and has self-lubricating properties.
  • the optical axis section of the screw shaft 4 ie, the rear end of the uncoated plastic material
  • the cover bushing 10 such a In terms of friction, the plastic material is not covered at the rear end 11 of the screw rod to avoid noise pollution; on the other hand, since the metal surface of the optical axis portion of the screw 4 can be directly rotated with the cover bushing 10 Cooperate, you can achieve a more precise between the two The gap fits to minimize the tolerance of the fit to reduce the impact probability caused by the excessive gap and achieve the effect of reducing noise.
  • the design parameters of the box liner 9 and the lid liner 10 in accordance with a particular embodiment of the present invention are shown, wherein the inner diameter of the casing liner 9 and the screw 4 are matched.
  • the tolerance is preferably controlled between 0.005 and 0.02 mm, and the tolerance between the inner diameter of the cover bushing 10 and the lead screw 4 is preferably controlled to be 0.075-0.095 mm.
  • the roundness and concentricity of the screw can be accurately controlled to 0.005, respectively. And 0.01.
  • a worm gear drive is preferably employed, as shown in FIG.
  • the worm gear has the advantages of large transmission ratio, good self-locking performance and low running noise, and is especially suitable for the headrest driving device.
  • the movement is transmitted to the screw 4 integrally formed with the worm wheel 5 by the worm gear transmission and rotated, and then the headrest lifting mechanism (not shown) attached to the screw rod 4 is driven up and down.
  • the transmission ratio of the worm gear is preferably designed to be 8.5.
  • the lead screw 4 and the worm gear 5 are constructed as a single piece, for example a worm gear 5 can be overmolded onto the lead screw 4.
  • the lead screw 4 and the worm gear 5 can be used as separate components and coupled to each other by a keyed connection or any other suitable connection to enable rotation together.
  • both the box body and the box cover are provided for mounting the gear box assembly to a fixed support member, such as a seat frame (for example, a seat frame) Not shown) - the positioning mounting holes in the upper case, such that the case and the cover pass the fasteners (not shown) in the positioning mounting holes 12 and the threaded fasteners for fixing the cover 3 and the case 2
  • the fastening (preferably the fastening screw 7) is connected such that the installation of the excessive fasteners easily causes deformation of the cover 3. It can be understood that the deformation of the cover 3 caused by the installation also causes noise, and also affects the running performance of the drive.
  • At least two of the positioning mounting holes 12 in the gearbox assembly 1 for mounting the gearbox assembly 1 to the seat frame are only Arranged on the box body, the box cover is fixedly mounted to the box body only by the fastening screw 7, and the fasteners in the positioning mounting hole 12 are no longer passed through the box cover, thereby reducing the noise caused by the installation deformation of the box cover.
  • a convex portion 13 including two positioning mounting holes 12 is provided on the casing 2, and a recess 14 adapted to receive the two convex portions 13 is correspondingly provided on the tank cover 3
  • the projection 13 and the recess 14 are not in contact with each other, ie there is a certain gap between the two.
  • the mounting planes of the two positioning mounting holes 12 project a certain distance from the upper surface of the cover 3 (ie the side opposite the abutment faces of the cover 3 and the case 2), preferably at a distance of 0.5- Between 1 mm, more preferably, the distance is 0.6 mm.
  • the cover 3 can be further prevented from being affected by the mounting deformation, thereby reducing noise and providing better system operation stability.
  • the mounting plane of the positioning mounting hole on the case 2 refers to the side that faces the same as the upper surface of the box cover 3.
  • a stop plug 15 is also provided on the housing 2, the stop plug 15 being arranged at the free end of the drive shaft of the worm 6 (the free end finger) It is an extension line away from the end of the motor and abuts against the free end of the drive shaft for controlling the axial play of the drive shaft (for example, the motor shaft 8) coupled to the worm 6.
  • the drive shaft for example, the motor shaft 8
  • the stopper plug 15 is preferably fastened to the casing 2 by means of a screw and abuts against the rear end portion 16 of the motor shaft 8 after being screwed into the casing 2, thereby realizing the motor. Control of the axial play of the shaft.
  • the adaptive adjustment of the position of the stop plug can be realized by means of screw connection to ensure that the axial clearance of the motor shaft is different in different gearbox assemblies, but the stop plug 15 has an axial direction.
  • the adjustment amount can always abut against the free end of the corresponding motor shaft 8, thus ensuring a "zero clearance" of the motor shaft in different gearbox assemblies.
  • the stopper plug 15 is made of a plastic material, preferably having a certain amount of elastic deformation, which avoids sharper noise caused by collision in the case of using a metal material, which may be, for example, PA66+GF30 (ALCOM PA66910/1GF30M02).
  • a control device for controlling the play of the rear end of the screw is also provided, as shown in FIG.
  • the rear end 11 of the screw rod directly contacts the box cover 3, which causes axial turbulence or even impact on the box cover due to the inevitable fitting clearance when the screw rod 4 is moved, thereby generating noise.
  • the front end of the screw rod is passed out from the box body, the rear end of the screw rod is located in the box body and faces the box cover, and the rear end 11 of the screw rod and the box A play control device is provided between the inner surfaces of the cover 3 as a rear end of the screw rod, which greatly reduces the generation of noise.
  • a plastic spacer is disposed at a rear end of the screw rod, and a rubber pad 18 is additionally provided, wherein the rubber pad 18 is installed in a mounting hole in the cover 3, and the plastic pad The sheet is held between the rubber pad 18 and the rear end of the screw to compensate for the amount of turbulence of the screw 4 by the elastic properties of the rubber pad 18, thereby better controlling the play of the rear end 11 of the screw.
  • the rubber pad 18 is, for example, an annular ring that is sleeved over a stud disposed in its mounting hole for reliable positioning.
  • the plastic gasket can be, for example, a flat gasket 17.
  • the gearbox assembly is used in a headrest drive to adjust the vertical direction of the headrest At the time of location, low noise is a very important parameter for the seat user.
  • the optimal comfort of the seat user can be achieved, so that on the one hand, the driver can make the operation more safe and reliable during the driving process due to the improved comfort.
  • the passenger can adjust the most comfortable headrest leaning position without being affected by the sharp noise.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
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Abstract

一种齿轮箱总成（1），包括箱体（2）、箱盖（3）、沿第一方向插入穿过所述箱体（2）的丝杆（4）、一体形成在所述丝杆（4）上的蜗轮（5），以及沿与第一方向垂直的第二方向布置在箱体（2）中的蜗杆（6），所述蜗杆（6）与蜗轮（5）啮合传动，其中，通过一驱动轴驱动所述蜗杆（6）旋转，从而使蜗杆（6）通过运动副带动所述蜗轮（5）和丝杆（4）一同旋转，所述丝杆（4）通过螺旋传动使附接在丝杆（4）上的升降机构上下移动。所述箱体（2）上还设置有一止挡塞（15），所述止挡塞（15）布置于蜗杆（6）的驱动轴的自由端的延长线上，并和驱动轴的自由端相抵靠地接触。此外，还提供了一种包括上述齿轮箱总成（1）的头枕驱动器。

Description

齿轮箱总成以及包括该齿轮箱总成的头枕驱动器 技术领域
本发明涉及驱动器领域、尤其涉及驱动器的齿轮箱总成。此外，本发明还涉及包括上述齿轮箱总成的头枕驱动器。
背景技术
通常，为了使人在就坐于汽车座椅上时能够针对其身形差异、坐姿差异而适应性地提供最舒适的头枕倚靠位置，存在对座椅头枕的竖向位置进行方便且舒适的调节的需求。
在现有技术中，通常借助于头枕驱动器的传动机构与头枕机构的协作来实现对头枕的竖向位置调节。例如，根据专利文献CN202863201U已知，头枕驱动器通常包括具有蜗轮-螺杆和头枕升降座的传动机构、具有蜗杆的动力机构以及头枕机构，该头枕机构与该传动机构连接使得头枕可作升降运动以实现头枕的竖向位置调节。然而，在头枕的竖向调节过程中，用于头枕驱动器的齿轮箱总成在工作时往往由于各传动部件之间不受控的配合间隙而存在部件之间的不期望的相对碰撞，导致在头枕调节过程中伴随着较大的振动和噪音，这使得用户在调整头枕时，由于头部会感受到强烈的振动且人耳会听到尖锐的噪音而感到极为不舒适，从而影响座椅使用者的舒适度、甚至影响驾驶操作的安全性。
因而，为了尽可能地降低噪音同时保证驱动器的优良的运行性能，需要更好地控制头枕驱动器的各传动部件之间的配合间隙并且通过限制各部件在运行过程中在轴向方向或径向方向上的窜动，实现降噪、且同时提高运行稳定性。
发明内容
因此，本发明就是基于这样的背景而提出的，且旨在提供一种结构紧 凑、丝杆跳动小且运行噪音低的齿轮箱总成。特别是，提供一种包括该齿轮箱总成的头枕驱动器，使得座椅使用者在进行调整头枕时更具舒适性。
本发明的第一方面提供了一种齿轮箱总成，包括箱体、箱盖、沿第一方向插入穿过所述箱体的丝杆、一体形成在所述丝杆上的蜗轮，以及沿与第一方向垂直的第二方向布置在箱体中的蜗杆，所述蜗杆与蜗轮啮合传动，其中，通过一驱动轴驱动所述蜗杆旋转，从而使蜗杆通过运动副带动所述蜗轮和丝杆一同旋转，所述丝杆通过螺旋传动使附接在丝杆上的升降机构上下移动，其特征在于，所述箱体上还设置有一止挡塞，所述止挡塞布置于蜗杆的驱动轴的自由端的延长线上，并和驱动轴的自由端相抵靠地接触。优选地，所述止挡塞由塑料材料制成，且所述止挡塞通过螺纹紧固至所述箱体。
根据本发明的一有利实施例，还设置有用于将齿轮箱总成安装至固定支承件上的至少两个定位安装孔，所述定位安装孔仅布置在所述箱体上。有利地，所述定位安装孔的安装平面高于所述箱盖的上表面一定距离，优选地，所述定位安装孔的安装平面高于所述箱盖的上表面0.5-1mm。
根据本发明的另一有利实施例，所述丝杆的前端从所述箱体穿出，所述丝杆的后端位于所述箱体内并朝向所述箱盖，其中，所述丝杆的后端与所述箱盖的内表面之间设置有止挡装置。有利地，所述止挡装置包括塑料垫片和橡胶垫。
另外，根据本发明实施例的齿轮箱总成中的所述箱盖和箱体上分别设置有用于旋转地支承丝杆的箱盖衬套和箱体衬套。
本发明的第二方面提供了一种包括上述齿轮箱总成的头枕驱动器。采用根据本发明的头枕驱动器调整头枕时所产生的噪音不大于40dBA，这使得可以确保座椅使用者在调整头枕时的最佳舒适度。
附图说明
通过以下参照附图的描述，本发明的上述和其他特征和优点将变得更加容易理解，附图中：
图1是本发明实施例提供的齿轮箱总成的分解视图(蜗杆未示出)；
图2a-2b分别以透视图和截面视图的形式示出安装在箱体中的箱体衬套；图2c-2d分别以透视图和截面视图的形式示出安装在箱盖中的箱盖衬套；
图3示出了本发明实施例中的蜗轮蜗杆传动机构；
图4a示出根据本发明的一实施例的蜗轮-丝杆子组件装配图(丝杆的后端包覆塑料材料)；图4b示出根据本发明的一有利实施例的蜗轮-丝杆子组件装配图(丝杆的后端未包覆塑料材料)；
图5示出丝杆的结构示意图，其中A处为蜗轮包覆的位置；
图6a示出根据现有技术中的齿轮箱总成中的箱体与箱盖的安装示意图；图6b示出根据本发明的一有利实施例的齿轮箱总成中的箱体与箱盖的安装示意图；
图7a-7c示出对电机轴的游隙控制的示意图；
图8示出采用游隙控制装置控制丝杆的后端的游隙的情况的示意图。
具体实施方式
下面结合附图和具体实施例进一步详细地说明本发明。
参照图1，示出了根据本发明实施例的齿轮箱总成1，且作为示例，该齿轮箱总成1可用于汽车座椅的头枕驱动器中，并与头枕机构协作以实现对头枕的竖向位置调节。更具体地，该齿轮箱总成1包括箱体2、箱盖3、沿第一方向插入穿过所述箱体2的丝杆4、一体地形成在所述丝杆4上的蜗轮5，以及沿第二方向布置在箱体2中的蜗杆6(参见图3)，蜗杆6与该蜗轮5啮合传动。可以理解，所述第一方向与所述第二方向优选地为相互垂直的关系。用于头枕驱动器中的该齿轮箱总成通过如下运动传递实现头枕的纵向升降功能：通过一驱动轴(优选为电机轴8)使所述蜗杆6旋转；蜗杆6通过运动副带动一体的蜗轮5和丝杆4一同旋转，其中所述蜗轮5和丝杆4可通过本领域已知的任何适当的方式一体成形；然后，所述丝杆4通过螺旋传动使附接在该丝杆4上的头枕升降机构上下移动，从而 实现对头枕的竖向位置调节。
在根据本发明实施例的齿轮箱总成中，箱体2和箱盖3作为两个彼此独立的部件可借助于螺接或本领域已知的其他适当的方式彼此固定。优选地，箱体2和箱盖3通过三个紧固螺钉7彼此紧固，如图1所示。所述紧固螺钉7优选为自攻螺钉，如ST3.0×1.27。
根据本发明的一实施例，在齿轮箱总成1中设置有用于旋转地支承丝杆4的箱体衬套9，其中，插入穿过所述箱体2的丝杆4延伸进入到箱盖3中的非贯通的丝杆接纳孔中，箱盖3可以通过该丝杆接纳孔直接旋转地支承丝杆。优选地，为避免金属材质的丝杆4与箱盖3的直接接触而导致丝杆磨损较为严重，在丝杆的后端11上有利地包覆有一层耐磨的塑料材料(如图4a所示)，这种塑料包覆会极大地缓解丝杆在使用过程中的磨损。而且，当丝杆上包覆的塑料材料磨损较大时，还可以方便地给丝杆更换新的塑料包覆层。
应了解的是，由于塑料材料之间的配合公差相比于金属材料而言难以被精确地控制(一般地，塑料材料与金属材料在配合公差方面可能存在几十倍的差异)，这样，当箱盖3也采用注塑件时，丝杆4后端的塑料包覆层可能会与箱盖3之间存在较大的配合间隙，引起较为严重的噪音。针对这一使用情况，本发明还提出了另一有利实施例，在此有利实施例中，可选地，如图2a-2d所示，除了在箱体2内设置有箱体衬套9外，在箱盖3内还附加地设置有箱盖衬套10，以分别用于旋转地支承丝杆4。所述箱体衬套9和箱盖衬套10可以是单独的构件例如由耐磨塑料注塑成型，压装在对应的安装孔内；或者可以通过包覆成型的方式与箱体或箱盖一体地形成，或者采用任何其他适合的方式设置。箱体衬套9和箱盖衬套10例如可以由耐磨并具有自润滑性能的材料制成。应了解的是，在此有利实施例中，由于丝杆4的光轴部段(即未包覆塑料材料的后端)和箱盖3之间附加地设置有箱盖衬套10，这样一方面不再需要为了缓解摩擦而在丝杆的后端11包覆塑料材料，最终避免噪音污染；另一方面，由于丝杆4的光轴部段的金属表面可以直接和箱盖衬套10转动配合，可以实现两者之间更精确的间 隙配合，从而最大化地缩小配合公差，以减小因间隙过大而引致的撞击几率，达到减小噪音的效果。
如表1所示，示出了根据本发明的一特定实施例中的箱体衬套9和箱盖衬套10的设计参数，其中箱体衬套9的内径与丝杆4之间的配合公差优选地控制在0.005-0.02mm之间，箱盖衬套10的内径与丝杆4之间的配合公差优选地控制在0.075-0.095mm。
表1
Figure PCTCN2017076920-appb-000001
此外，根据本发明的一有利实施例，在丝杆的后端11不存在塑料包覆的情况下(如图5所示)，丝杆的圆度和同心度分别可以精确地被控制为0.005和0.01。
在本发明实施例的齿轮箱总成中，优选采用了蜗轮蜗杆传动装置，如图3所示。蜗轮蜗杆传动具有传动比大、自锁性能好、运行噪音低等优点，尤其适用于头枕驱动装置中。在头枕调节过程中，通过蜗轮蜗杆传动将运动传递至与蜗轮5一体成型的丝杆4并使其旋转，并进而带动附接至丝杆4上的头枕升降机构(未示出)上下运动，并通过蜗轮蜗杆的自锁性而使头枕调节后的位置能够稳定地保持。在根据本发明的一有利实施例中，该蜗轮蜗杆的传动比优选地设计为8.5。
在图1所示的实施例中，丝杆4和蜗轮5构造为一体件，例如蜗轮5可包覆成型在所述丝杆4上。然而，应理解的是，丝杆4和蜗轮5可以作为单独的构件，并通过键连接或其他任何适当的连接方式而彼此联接以能够一起旋转。
根据现有技术中的箱体和箱盖的组装后的结构，如图6a所示，箱体和箱盖上均开设有用于使齿轮箱总成安装至固定支承件——例如座椅框架(未示出)——上的定位安装孔，这样，箱体和箱盖通过定位安装孔12内的紧固件(未示出)和用于固定箱盖3和箱体2的螺纹紧固件(优选地紧固螺钉7)连接，这样，过多的紧固件的安装容易引起箱盖3的变形。可以理解，这种因安装而引起的箱盖3的变形也会引起噪音，同时还会影响驱动器的运行性能。针对这一问题，在图6b中示出的本发明的一有利实施例中，齿轮箱总成1中用于将齿轮箱总成1安装至座椅框架上的至少两个定位安装孔12仅布置在箱体上，箱盖仅通过紧固螺钉7固定安装至箱体上，定位安装孔12内的紧固件不再穿设通过箱盖，从而减小了箱盖因安装变形引起噪音的可能。
优选地，在所述箱体2上设置有包括两个定位安装孔12的凸部13，并且在所述箱盖3上相应地设置有适应性地接纳所述两个凸部13的凹部14，有利地，凸部13和凹部14彼此不接触，即两者之间存在一定间隙。应理解的是，可根据实际需要设置不同数量的定位安装孔及对应数量的凸部和凹部。有利地，所述两个定位安装孔12的安装平面突出所述箱盖3的上表面(即与箱盖3和箱体2的对接面相对的一面)一定距离，该距离优选地在0.5-1mm之间，更优选地，该距离为0.6mm。有利地，通过设置定位安装孔12的安装平面与箱盖3的上表面之间的高度差，可以进一步避免箱盖3受到安装变形的影响，从而能够降低噪音并提供更好的系统运行稳定性。此处，应理解的是，箱体2上的所述定位安装孔的安装平面是指与箱盖3的上表面相同朝向的一面。
根据另一有利的实施例，如图7a-7c所示，在所述箱体2上还设置有一止挡塞15，止挡塞15布置于蜗杆6的驱动轴的自由端(该自由端指的是远离电机的一端)的延长线上，并和驱动轴的自由端相抵靠，用以控制与蜗杆6联接的驱动轴(例如电机轴8)的轴向游隙。在利用头枕驱动器调节头枕的竖向位置的过程中，为了实现头枕的升、降方向的切换，需通过电机实现换向，然而，在已有的结构设计中，不存在对电机轴8的轴向 游隙的控制，因而存在电机轴8的轴向窜动，这种轴向窜动在电机换向时表现得尤为明显，其会因部件间的撞击而产生较大的噪音，这种噪音在头枕调节过程中往往会给座椅使用者带来不舒适感。因此，实现电机轴的“零游隙”对于减小驱动器运行噪音是非常关键的。如图7b所示，所述止挡塞15优选通过螺纹紧固在箱体2上，并在拧入箱体2中一定距离后抵靠在电机轴8的后端部16，从而实现对电机轴的轴向游隙的控制。可以理解，通过螺纹连接的方式，可以实现对止挡塞位置的适应性调节，以保证在不同齿轮箱总成中，电机轴的轴向游隙虽然不同，但因止挡塞15具有轴向调节量，始终能与对应的电机轴8的自由端相抵靠，从而确保不同齿轮箱总成中的电机轴的“零游隙”。
优选地，所述止挡塞15采用塑料材料制成，优选地具有一定的弹性变形量，这可避免在采用金属材料的情况下因碰撞引起的较尖锐的噪音，所述塑料材料可例如为PA66+GF30(ALCOM PA66910/1GF30M02)。
根据又一有利实施例，还设置有用于控制丝杆的后端的游隙的控制装置，如图8所示。在已有技术中，丝杆的后端11直接接触箱盖3，这会使得在丝杆4运动时由于必然存在的配合间隙而存在轴向窜动，甚至撞击箱盖，从而产生噪音。然而，在本发明中，所述丝杆的前端从所述箱体穿出，所述丝杆的后端位于所述箱体内并朝向所述箱盖，所述丝杆的后端11与箱盖3的内表面之间设置有止挡装置用作丝杆的后端的游隙控制装置，可大大减少噪音的产生。具体地，如图8所示，在所述丝杆的后端设置有塑料垫片且还附加地设置有橡胶垫18，其中，橡胶垫18安装于箱盖3内的安装孔内，塑料垫片夹持在橡胶垫18和丝杆的后端之间，以通过橡胶垫18的弹性性能补偿丝杆4的窜动量，从而更好地控制丝杆的后端11的游隙。在一有利实施例中，该橡胶垫18例如为环形圈，该环形圈被套设在其安装孔内设置的凸柱上，以实现可靠定位。塑料垫片可例如为平垫片17。
通过上述对各部件的结构设计以及对特定部件(如电机轴、丝杆)的游隙控制，可以实现在齿轮箱总成的运行过程中较低的噪音，该噪音有利地不大于40dBA，这在该齿轮箱总成用于头枕驱动器中以调节头枕的竖向 位置时，噪音小对于座椅使用者而言是非常重要的一个参数指标。采用根据本发明实施例的齿轮箱总成来调节头枕，可以实现座椅使用者的最佳舒适度，这样一方面可以使驾驶员在驾驶过程中因舒适性提高而使得操作更加安全可靠，另一方面可以使乘客在免于受到尖锐噪音的影响下调整最舒适的头枕倚靠位置。
应当指出，上面说明的实施例仅应被视为示例性的，本发明不限于这些实施例。通过考虑本说明书的内容，本领域技术人员可在不偏离本发明的范围或精神的情况下做出多种改变和变型。本发明的真实范围由所附权利要求以及等同方案限定。

Claims (10)

  1. 一种齿轮箱总成，包括箱体、箱盖、沿第一方向插入穿过所述箱体的丝杆、一体形成在所述丝杆上的蜗轮，以及沿与第一方向垂直的第二方向布置在箱体中的蜗杆，所述蜗杆与蜗轮啮合传动，其中，通过一驱动轴驱动所述蜗杆旋转，从而使蜗杆通过运动副带动所述蜗轮和丝杆一同旋转，所述丝杆通过螺旋传动使附接在丝杆上的升降机构上下移动，其特征在于，所述箱体上还设置有一止挡塞，所述止挡塞布置于蜗杆的驱动轴的自由端的延长线上，并和驱动轴的自由端相抵靠地接触。
  2. 根据权利要求1所述的齿轮箱总成，其特征在于，所述止挡塞由塑料材料制成。
  3. 根据权利要求1或2所述的齿轮箱总成，其特征在于，所述止挡塞通过螺纹紧固至所述箱体。
  4. 根据权利要求1或2所述的齿轮箱总成，其特征在于，还设置有用于将齿轮箱总成安装至固定支承件上的至少两个定位安装孔，所述定位安装孔仅布置在所述箱体上。
  5. 根据权利要求4所述的齿轮箱总成，其特征在于，所述定位安装孔的安装平面高于所述箱盖的上表面一定距离。
  6. 根据权利要求5所述的齿轮箱总成，其特征在于，所述定位安装孔的安装平面高于所述箱盖的上表面0.5-1mm。
  7. 根据权利要求1或2所述的齿轮箱总成，其特征在于，所述丝杆的前端从所述箱体穿出，所述丝杆的后端位于所述箱体内并朝向所述箱盖，其中，所述丝杆的后端与所述箱盖的内表面之间设置有止挡装置。
  8. 根据权利要求7所述的齿轮箱总成，其特征在于，所述止挡装置包括塑料垫片和橡胶垫。
  9. 根据权利要求1或2所述的齿轮箱总成，其特征在于，所述箱盖和箱体上分别设置有用于旋转地支承丝杆的箱盖衬套和箱体衬套。
  10. 一种头枕驱动器，其特征在于，包括权利要求1至9中任一项所述的齿轮箱总成。
PCT/CN2017/076920 2016-06-02 2017-03-16 齿轮箱总成以及包括该齿轮箱总成的头枕驱动器 WO2017206569A1 (zh)

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