WO1999008021A1 - Drehverstellgetriebe - Google Patents
Drehverstellgetriebe Download PDFInfo
- Publication number
- WO1999008021A1 WO1999008021A1 PCT/EP1998/004639 EP9804639W WO9908021A1 WO 1999008021 A1 WO1999008021 A1 WO 1999008021A1 EP 9804639 W EP9804639 W EP 9804639W WO 9908021 A1 WO9908021 A1 WO 9908021A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotary adjustment
- adjustment gear
- rotation
- eccentric
- axis
- Prior art date
Links
Classifications
-
- 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
- B60N2/22—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable
- B60N2/225—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by cycloidal or planetary mechanisms
- B60N2/2252—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the back-rest being adjustable by cycloidal or planetary mechanisms in which the central axis of the gearing lies inside the periphery of an orbital gear, e.g. one gear without sun gear
-
- 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
- F16H25/04—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying rotary motion
- F16H25/06—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying rotary motion with intermediate members guided along tracks on both rotary members
Definitions
- the invention relates to a rotary adjustment gear, in particular for adjusting the seat of motor vehicle seats.
- Bollmann transmission which is described in DE 38 01 930 AI, has become known in addition to the gear transmissions.
- This transmission consists of a flat drive part and a driven part, the drive part having a circular guide groove running eccentrically to the axis of rotation and the driven part being provided on the end face facing the drive part with an endless guide groove which has sections for guiding balls.
- the balls are guided in slot guides of a flange fixed to the housing and run in the guide grooves of the drive part and output part, whereby a power transmission but also a translation between the drive part and output part can be realized.
- the invention is based on the object of proposing a rotary adjustment gear, in particular for adjusting the seat of motor vehicle seats, which can be produced as inexpensively as possible and has a high load-bearing capacity.
- the invention is based on the idea of proposing a rotary adjustment gear which can be manufactured as inexpensively as possible.
- the rotary adjustment mechanism consists of a first element with a wave-shaped surface that is rotatable about an axis of rotation, a rotatable eccentric element with a circular circumference that is eccentric to the axis of rotation, and a holding element that is rotationally rigid with respect to the axis of rotation and that holds a plurality of rolling elements, can be made from sheet metal and assembled in a very simple manner, so that the total cost of the rotary adjustment gear can be kept low.
- the main advantage of the rotary adjustment mechanism according to the invention is that a large number of rolling elements each engage with depressions in the undulating surface of the first
- Element stand and therefore the transmission of forces and torques is distributed to a variety of rolling elements. This is of great importance, in particular in the event of a crash, because the very high forces which suddenly occur in this case can be absorbed and transmitted by a large number of rolling elements, so that the risk of the rotary adjustment gear breaking is reduced.
- the rotary adjustment gear for seat adjustment of motor vehicle seats can be manufactured with smaller dimensions in order to be able to withstand the same peak loads in the event of a crash as is the case with a conventional gear transmission.
- a last advantage lies in the fact that the undulating surface of the first element is to a certain extent elastic and also plastically deformable and can absorb part of the high forces that occur in the event of a crash, although this leads to an irreversible deformation of the undulating surface can.
- Preferred embodiments are characterized by the rest of the claims.
- the number of rolling elements is less than the number of depressions formed in the undulating surface.
- the rotary adjustment gear further comprises a rotationally symmetrical fixing part, which encloses the first element and the holding element and holds the rotary adjustment gear in the assembled state.
- a rotationally symmetrical fixing part which encloses the first element and the holding element and holds the rotary adjustment gear in the assembled state.
- the claimed radial arrangement of the individual elements i.e. in particular, the arrangement of the rolling elements radially between the eccentric element and the undulating surface of the first element permits an extremely compact design of the rotary adjustment gear.
- the entire transmission can be held together with a single rotationally symmetrical fixing part, the fixing part only enclosing the first element and the holding element, while the eccentric element is arranged between these two components.
- the eccentric part consists of first and second sections which are firmly connected to one another, the first section being rotationally symmetrical with respect to the axis of rotation and the first element and the holding element being supported in each case.
- the rolling elements and rollers are each frustoconical and the surfaces of the first element and of the eccentric element which are in engagement with the rollers are designed in such a way that the frustoconical rollers essentially abut the entire surface thereof.
- This embodiment which is preferably used in conjunction with a pretensioning element which is arranged in the rotary adjustment mechanism in such a way that it displaces the eccentric element in the axial direction of the axis of rotation so that it engages with the rollers without play, realizes a rotary adjustment mechanism in a very simple manner, that can be made with little or no game at all.
- the first element, eccentric element and the holding element are preferably each made of sheet metal.
- the production from sheet metal is an alternative that is suitable to allow a particularly inexpensive manufacture of the rotary adjustment gear.
- Fig. 1 and 2 are overall views of the front and 'from the side of Drehverstellgetriebes according to the invention are installation- geschreib;
- Fig. 3 shows section 3-3 in Fig. 1;
- Fig. 4 shows section 4-4 in Fig. 2;
- FIG. 5 is a sectional view corresponding to FIG.
- rotary adjustment gear is also intended to express that this is a slow-turning gear which serves less to transmit a torque than rather to precisely change the angular position of a part which is rigidly connected to the output element.
- FIG. 1 and 2 each show a top view and side view of an embodiment of the rotary adjustment gear, which is generally designated by reference number 10.
- the rotary adjustment gear has the shape of a flat disk which is rotationally symmetrical to the axis of rotation 12.
- a positive locking element 14 e.g. in the form of an internal or external hexagon in the area of a drive shaft 16, which can pass through the entire rotary adjustment gear 10 and thus a
- the rotary adjustment gear essentially consists of four different components.
- An eccentric drive element 20 is connected to the drive shaft in a torsionally rigid manner, but can alternatively also be connected in a rotationally rigid manner without the provision of a shaft to the output shaft of a motor drive device or else a manual actuation device.
- the eccentric drive element shown in FIG. 3 consists of two parts which are firmly connected to one another. In the present case, an annular disc 20b adjoins the outer circumference of a rotationally symmetrical first element 20a and is eccentric. In the illustration in FIG. 3, the extension A is greater than the extension A '.
- the eccentricity is very low, as can be seen in particular from the position of the axis of rotation 12 'relative to the position of the axis of rotation 12 located at the intersection and perpendicular to the intersection of the lines of symmetry.
- Rolling bodies in the form of rollers 22, which are cylindrical in the embodiment shown in FIG. 3, run on the outer circumference of the eccentric drive element 20, viewed in the radial direction.
- the rollers 22 are held in a dome-shaped, fixed part 24, the fixed part 24 also protruding. is preferably formed from sheet metal and is rotationally symmetrical.
- the fixed part 24 is mounted on the rotationally symmetrical first element 20a of the eccentric drive element, wherein there is a sliding pairing between the drive element 20 and the fixed part 24 in the area designated by reference number 26 in FIG. 3.
- a bearing can also be provided in the area of the sliding pairing 26, for example in the form of a needle bearing, but the embodiment which comes closest to the most cost-effective way of producing the rotary adjustment gear is described here.
- the rollers 22 are in contact with the outer circumference of the eccentric drive element 20, on the one hand, but also with an output pot 28, which can also be made of sheet metal, in order to keep the manufacturing costs low.
- the output pot 28 is also supported on the eccentric drive element 20 by the provision of a sliding pair 32 and has a surface 30 which is in contact with the rollers 22.
- a fixing part 32 is pushed over the rotary adjustment gear 10 and fixes the fixed part 24 and the driven pot 28 against each other, so that the eccentric drive element 20 arranged between the two cup-shaped elements 24 and 28 is also fixed in position.
- the function of the rotary adjustment gear becomes clear.
- the output pot 28 is shaped so that the surface 30 is wave-shaped, preferably sinusoidal. With the transmission shown, the force is transmitted via the rollers 22 between the outer circumference of the eccentric drive elements 20 and the undulating surface 30 of the
- Output pot 28 Due to the dome-like inclusion of the rollers 22 in the fixed part 24, which itself does not rotate about the axis of rotation 12, the rollers can only perform a movement in the radial direction of the rotary adjustment gear in addition to a rotational movement about their axes of rotation. This radial movement occurs due to the guidance of the rollers on the outer circumference of the eccentric drive element. Due to this radial reciprocating motion imposed on them by the eccentric drive element, the rollers exert a tangential force on the undulating surface 30 of the output pot 28, whereby the output pot 28 is set in rotation.
- the transmission ratio U of the transmission is freely selectable and depends on the number of depressions V in the undulating surface 30 and the number of rollers R.
- the transmission ratio Ü is calculated according to the equation
- the direction of rotation between the drive and the output can be reversed. If the number of rollers is greater than the number of depressions, the rotary adjustment gear has an opposite direction of rotation of the output pot to the drive, while with a positive transmission ratio
- the rotary adjustment gear according to the invention has the advantage over a gear transmission with a comparable transmission ratio that a large number of rollers are in engagement with the recesses of the output plug 28 and thus, even in the case of suddenly occurring, very high loads, there is a secure transmission of power without the risk of irreversible damage.
- irreversible damage usually occurs due to the fact that the output pot 28 plastically deforms in the area of the surface 30, but without breaking stress being exceeded.
- FIG. 5 shows an alternative embodiment of the rotary adjustment gear, which is designated by reference number 50.
- the main difference here is that the fixed part 24 holds frustoconical rollers 52.
- the frustoconical rollers 52 move between the outer circumferential surface of an eccentric drive element 54 and an output pot 56, the outer circumferential surface of the eccentric drive element 54 serving as the running surface for the rollers 52, as well as the undulating surface of the output pot 56, each angularly to Axis of rotation 12 are executed and are thus adapted to the conical shape of the rollers 52.
- a biasing element 58 is arranged in the form of a plate spring between the output pot 56 and the eccentric drive element 54 and the eccentric drive element 54 in the direction of the axis of rotation 12 so that a possible Play between the rollers 52 and the surfaces in contact with the rollers is avoided or at least significantly reduced.
- a shoulder 60 is provided in the output pot 56 formed, which can be produced by pressing when using a sheet metal part. Due to the outer circumferential surface of the output pot running at an angle to the axis of rotation 12, the fixing part 62 is designed such that it is bent only after assembly in order to ensure that the components of the rotary adjustment gear are fixed.
- the rotary adjustment gear according to the invention consists of a few parts and can be manufactured very inexpensively. Gear ratios from approx. 1:20 to 1:50, as are required especially for backrest gearboxes for adjusting vehicle seats, can be set, and the self-locking, which is also very important for this special application, is possible due to a very low eccentricity and thus high friction. Due to the numerous roles that are in engagement with the output pot, high forces and moments can be transmitted, so that, particularly in a crash situation, there is a higher strength of the rotary adjustment gear compared to a comparable gear transmission.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98943775A EP1000279A1 (de) | 1997-08-08 | 1998-07-23 | Drehverstellgetriebe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997134503 DE19734503A1 (de) | 1997-08-08 | 1997-08-08 | Drehverstellgetriebe |
DE19734503.4 | 1997-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999008021A1 true WO1999008021A1 (de) | 1999-02-18 |
Family
ID=7838466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/004639 WO1999008021A1 (de) | 1997-08-08 | 1998-07-23 | Drehverstellgetriebe |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1000279A1 (de) |
DE (1) | DE19734503A1 (de) |
WO (1) | WO1999008021A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10129271A1 (de) * | 2001-06-18 | 2003-01-09 | Jan Klindworth | Sitzverstellgetriebe |
DE10350153B4 (de) * | 2003-10-28 | 2008-06-05 | Keiper Gmbh & Co.Kg | Überlastmodul für einen Fahrzeugsitz |
DE102009011462B4 (de) | 2009-02-27 | 2022-08-25 | Keiper Seating Mechanisms Co., Ltd. | Beschlag für einen Fahrzeugsitz und Fahrzeugsitz |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1199257A (en) * | 1966-10-22 | 1970-07-22 | Patrick George Leeson | Speed Changing Mechanisms |
FR2069921A1 (de) * | 1969-12-05 | 1971-09-10 | Peugeot Cycles | |
EP0090214A1 (de) * | 1982-03-26 | 1983-10-05 | Advanced Energy Concepts '81 Ltd. | Epizykloidengetriebe mit freirollenden, rollenantreibenden Elementen |
EP0159926A1 (de) * | 1984-04-18 | 1985-10-30 | A. & M. Cousin et Cie | Rundes Gelenk, brauchbar für Sitze von Land-, See- und Luftfahrzeugen |
US5643128A (en) * | 1996-02-01 | 1997-07-01 | Ami Industries | Harmonic drive using guided, floating cam driven cylinders as power transmitting elements |
-
1997
- 1997-08-08 DE DE1997134503 patent/DE19734503A1/de not_active Withdrawn
-
1998
- 1998-07-23 EP EP98943775A patent/EP1000279A1/de not_active Ceased
- 1998-07-23 WO PCT/EP1998/004639 patent/WO1999008021A1/de not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1199257A (en) * | 1966-10-22 | 1970-07-22 | Patrick George Leeson | Speed Changing Mechanisms |
FR2069921A1 (de) * | 1969-12-05 | 1971-09-10 | Peugeot Cycles | |
EP0090214A1 (de) * | 1982-03-26 | 1983-10-05 | Advanced Energy Concepts '81 Ltd. | Epizykloidengetriebe mit freirollenden, rollenantreibenden Elementen |
EP0159926A1 (de) * | 1984-04-18 | 1985-10-30 | A. & M. Cousin et Cie | Rundes Gelenk, brauchbar für Sitze von Land-, See- und Luftfahrzeugen |
US5643128A (en) * | 1996-02-01 | 1997-07-01 | Ami Industries | Harmonic drive using guided, floating cam driven cylinders as power transmitting elements |
Also Published As
Publication number | Publication date |
---|---|
DE19734503A1 (de) | 1999-02-11 |
EP1000279A1 (de) | 2000-05-17 |
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