EP0446223A1 - A device for progressive gear change - Google Patents
A device for progressive gear changeInfo
- Publication number
- EP0446223A1 EP0446223A1 EP89912532A EP89912532A EP0446223A1 EP 0446223 A1 EP0446223 A1 EP 0446223A1 EP 89912532 A EP89912532 A EP 89912532A EP 89912532 A EP89912532 A EP 89912532A EP 0446223 A1 EP0446223 A1 EP 0446223A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear wheel
- gear
- steering
- centre axis
- steering housing
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 230000000750 progressive effect Effects 0.000 title claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000000063 preceeding effect Effects 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 abstract 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 241000269627 Amphiuma means Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 210000000629 knee joint Anatomy 0.000 description 1
- 210000002414 leg Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- 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
- F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
- F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
- F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
Definitions
- the present invention refers to a device for progressive gear change, i.e. a device transforming a uniform motion introduced at the input side thereof into a non-uniform motion taken out at the output side thereof.
- Devices for progressive gear change are earlier known. Such earlier devices generally incorporate non-round gear wheels, or the like, by aid of which the progressive gear change may be obtained. These earlier known devices are often complex and expensive to manufacture.
- the device according to the invention has several advantages as compared to the known devices. For one thing, it has no non-round gear wheels, which i.a. means simpler and less expensive manufacturing methods as compared to manufacture of known devices.
- a suitable field of application for the device is as a part of the steering systems of a motor car. It is easy to arran ⁇ ge the device thus that turning of the steering wheel a cer ⁇ tain rotational angle results in a smaller turning motion of the front wheels of the car, whereas turning of the steering wheel another but as big rotational angle results in a bigger turning motion at the front wheels.
- Fig. 1 shows an embodiment of the device as seen from its front side.
- Fig. 2 is section along lines A-A in Fig. 1.
- the device shown in the drawing consists of a steering housing 1 in which a gear wheel 2 is rotatably supported about its non-displaceable centre axis 3.
- the teeth of the gear wheel engage with the teeth of a gear rack 4, which is displaceable in its longitudinal direction perpendicularly - to the centre axis 3 of " the gear wheel, when the gear wheel 2 is caused to rotate about its centre axis 3.
- the rotational motion of the gear wheel 2 about the centre axis is produced with aid of an eccentric pivot 5 arranged in parallel to the centre axis 3 of the gear wheel, which eccentric pivot is non-centrally attached to the gear wheel 2 and which is arranged to rotate about its longitudinal axis by means of a rotatable shaft 7, which is articulated in two positions 6.
- the eccentric pivot 5 is displaceably arranged in a straight guiding groove 8 provided in the steering housing 1.
- the eccentric pivot rotates it will urge the gear wheel 2 to rotate about its centre axis 3 at the same time as it will be displaced in the guiding groove 8.
- the displacement is possible due to the joints 6, which are arranged thus that the length of "the shaft 7 is variable.
- the rotational speed of the gear wheel will not be uniform but it is rather small, when the eccentric pivot 5 is farthest away from or nearest to the gear rack 4 in the guiding groove 8. The rotational speed will become biggest when the eccentric pivot is situated between the end positions in the guiding grooves 8.
- the different circumferential speeds of the gear wheel 2, which depend on the position of the eccentric pivot 5 in the guiding groove 8, means that the gear rack will move diffe- rent distances for each rotational angle of the gear wheel, and this may be utilized e.g. for steering a motor car.
- the gear rack 4 then is used in such a manner, that the gear rack is in its middle portion and the eccentric pivot in its lowermost or uppermost position, if the guiding groove 8 is provided vertically, when the car wheels are pointing for driving forward.
- the steering wheel is turned in the right-hand or left-hand direction, which steering wheel is provided at the free end of the shaft 7, the circumference of the gear wheel will move only a short distance for each rotational angle, when the eccentric pivot 5 is situated at an end position in the guiding groove 8.
- a steering round 9 is provided at each side of the gear wheel 2, which steering rounds rotate together with the gear wheel and is guided by guiding rules 10 arranged in the steering housing.
- the rounds may either be manufactured separately or be made in one piece with the gear wheel 2.
- In the rounds are provided holes for the centre axis 3 of the gear wheel and for the eccentric pivot 5.
- the steering housing 1 is preferably manufactured in two mainly similar halves, which are interconnected. In each half are provided guiding grooves 8 for the eccentric pivot 5 in positions opposed to each other.
- each steering groove is fitted with a guide bearing 11 about the eccentric pivot, which bearings are slidably arranged in the guiding grooves 8.
- the gear rack 4 is displaceably arranged in a groove 12 in the steering housing 1.
- stops 13 are provided at both ends of the gear rack.
- the steering housing 1 with the gear rack 4 and the shaft 7 with the joints 6, which at its free end is equipped with a steering wheel for its rotation as shown by Fig. 2, are fitted to a common frame 14.
- Another field of application is for bicycle tread crank mechanisms, where the progressive gear change according to the invention can be used for adapting the crank movement to the varying muscle strength of the cyclist in view of the bending of his legs about the knee-joint.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Power Steering Mechanism (AREA)
- Transmission Devices (AREA)
- Retarders (AREA)
Abstract
Le dispositif comprend une roue de transmission (2), qui est agencée à l'intérieur d'une boîte de direction, dont les dents entrent en prise avec les dents d'un engrenage (4) et qui est positionnée de manière à tourner autour de son axe central (3) sous l'action d'un pivot excentrique (5) rotatif fixé de manière non centrale à la roue de transmission (2). Le pivot excentrique (5) se déplace dans une rainure de guidage rectiligne (8) agencée dans le boîtier de direction (1). Lorsque le pivot excentrique tourne de manière uniforme, la roue de transmission (2) tourne de manière non uniforme et l'engrenage (4) se déplace à une vitesse progressive.The device comprises a transmission wheel (2), which is arranged inside a steering gear, whose teeth engage with the teeth of a gear (4) and which is positioned so as to rotate around of its central axis (3) under the action of a rotating eccentric pivot (5) fixed non-centrally to the transmission wheel (2). The eccentric pivot (5) moves in a straight guide groove (8) arranged in the steering gear (1). When the eccentric pivot rotates uniformly, the transmission wheel (2) rotates non-uniformly and the gear (4) moves at a progressive speed.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8804113A SE461348B (en) | 1988-11-15 | 1988-11-15 | DEVICE FOR PROGRESSIVE EXCHANGE |
SE8804113 | 1988-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0446223A1 true EP0446223A1 (en) | 1991-09-18 |
Family
ID=20373938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89912532A Withdrawn EP0446223A1 (en) | 1988-11-15 | 1989-11-15 | A device for progressive gear change |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0446223A1 (en) |
SE (1) | SE461348B (en) |
WO (1) | WO1990005861A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202004001614U1 (en) * | 2004-02-03 | 2004-06-09 | Trw Automotive Gmbh | Actuator, especially for a chassis |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1284783B (en) * | 1964-04-25 | 1968-12-05 | Scragg & Sons | Device for the changeable setting of the stroke of a linearly reciprocating organ |
US3459056A (en) * | 1966-12-15 | 1969-08-05 | Seamen S Unit | Constant torque transmission |
AU472043B2 (en) * | 1970-10-15 | 1976-05-13 | John Henry Brems | Reciprocating drive mechanism |
US3857292A (en) * | 1973-04-30 | 1974-12-31 | J Brems | Linear indexing mechanism |
-
1988
- 1988-11-15 SE SE8804113A patent/SE461348B/en not_active IP Right Cessation
-
1989
- 1989-11-15 WO PCT/SE1989/000659 patent/WO1990005861A1/en not_active Application Discontinuation
- 1989-11-15 EP EP89912532A patent/EP0446223A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9005861A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE8804113D0 (en) | 1988-11-15 |
SE461348B (en) | 1990-02-05 |
WO1990005861A1 (en) | 1990-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19910514 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19920531 |