WO2024251838A1 - Dispositif de blocage d'une transmission de chaîne cinématique dans un véhicule automobile - Google Patents
Dispositif de blocage d'une transmission de chaîne cinématique dans un véhicule automobile Download PDFInfo
- Publication number
- WO2024251838A1 WO2024251838A1 PCT/EP2024/065503 EP2024065503W WO2024251838A1 WO 2024251838 A1 WO2024251838 A1 WO 2024251838A1 EP 2024065503 W EP2024065503 W EP 2024065503W WO 2024251838 A1 WO2024251838 A1 WO 2024251838A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rod
- locking
- wheel
- axis
- sleeve
- 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.)
- Pending
Links
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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/3458—Parking lock mechanisms or brakes in the transmission with electric actuating means, e.g. shift by wire
- F16H63/3466—Parking lock mechanisms or brakes in the transmission with electric actuating means, e.g. shift by wire using electric motors
-
- 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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/3425—Parking lock mechanisms or brakes in the transmission characterised by pawls or wheels
-
- 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
- F16H2025/2059—Common movement by two screws or two nuts, e.g. two connected screws with opposite thread direction
-
- 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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/304—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force
- F16H2063/3063—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force using screw devices
Definitions
- the invention relates to a device for blocking a driveline transmission in a motor vehicle.
- This type of locking device is commonly called the parking brake and is conventionally used particularly on vehicles with automatic transmission. This type of locking device is also used in electric or hybrid vehicles.
- the transmission locking device is activated when the driver positions the transmission selector lever in the “P” position, generally when the vehicle is stationary.
- the locking device in question here is distinct and complementary to another brake system called a parking brake, also present on motor vehicles, and acting directly at the wheels of the vehicle.
- Said parking brake also acts as an emergency brake to slow down and immobilize the vehicle.
- the parking brake which is the subject of the present invention is intended and designed to be engaged only at zero or near-zero speed.
- the inventors sought to improve the situation and to propose a new configuration to achieve the parking brake function.
- a device for blocking a driveline transmission in a motor vehicle, by mechanical engagement of at least one blocking member in a toothed wheel of the transmission, the device comprising at least:
- the rod rotatably mounted in a housing about a rod axis, the rod comprising a first portion equipped with an external thread with a right-hand thread and a second portion equipped with an external thread with a left-hand thread,
- a motor member configured to selectively rotate the rod in one direction or the other
- a first locking member comprising a first sleeve centered on the rod axis and a first projection extending radially outward from the sleeve, the sleeve comprising an internal thread, adapted to cooperate by form complementarity with an external thread of the rod, the first projection comprising a free end forming a stop for stopping a tooth of the gear wheel in a first direction of rotation,
- a second locking member comprising a second sleeve centered on the rod axis and a second projection extending radially outward from the sleeve, the sleeve comprising an internal thread, adapted to cooperate by form complementarity with the other external thread of the rod, the second projection comprising a free end forming a stop for stopping a tooth of the toothed wheel in a second direction of rotation,
- the proposed configuration proves to be compact and simple to manufacture and assemble.
- the proposed configuration requires fewer parts than in the solutions of the known art and furthermore, advantageously, the proposed configuration is lighter than the configurations known in the art.
- driver train should here generally be understood to mean any system comprising an engine, whether internal combustion or electric, a transmission comprising a reducer with, where appropriate, several selectable reduction ratios, a differential and two wheel shafts connected respectively to a left wheel and a right wheel of a vehicle axle.
- each of the first and second projections is formed as a finger that extends in an extension direction (X1, X2) inclined relative to the rod axis.
- X1, X2 extension direction
- the tip of the finger can be inserted between two teeth of the toothed wheel.
- the inclination of the finger makes it possible to absorb a force resulting from a torque exerted by the wheel, the finger works essentially in compression and the cantilever effect is minimized.
- the fingers are directed towards each other. They can thus grip a tooth of the gear wheel in a vice like a clamp. The functional clearance can thus be reduced to a very small value or even to zero.
- the extension direction (X1, X2) is inclined at an angle 0 relative to the rod axis, 0 being between 35° and 60° and preferably between 40° and 50°. This gives a bracing effect for the rotation stop direction where the finger works in compression.
- the chosen angle (or angular range) results from a compromise between the vice grip effect and finesse allowing the finger to be inserted between two successive teeth of the toothed wheel.
- the ends of the first and second projections are moved in translation along a tangent to a primary circle of the gear wheel. It is noted that this direction of movement is a distinctive characteristic with respect to the known art in which the movable element comes radially closer to the gear wheel. The radial size with respect to the axis of the gear wheel is also reduced.
- the rod axis (A) is perpendicular to the wheel axis (W). As a result, there is no need to locate an axis of rotation parallel to the axis of the gear wheel in the vicinity of the gear wheel. Other than the axis (W) of the gear wheel, the rod axis (A) is the only axis required in the proposed configuration of the function.
- the first and second projections generally extend in a radial plane (PR) perpendicular to the wheel axis (W). This provides a reduced bulk with a flat configuration favorable to easy and compact integration into a transmission.
- the first and second projections act on the same tooth of the gear wheel.
- the locking system can thus be located on a reduced area relative to the gear wheel.
- the chain of ribs is thus as short as possible.
- the number of teeth on the gear wheel is between 10 and 20. Whereby, the probability of being able to directly block a tooth with the two fingers of the blocking members approaching each other can be maximized.
- the rod is mounted and interposed between a bearing of the drive member and an opposite bearing connected to the transmission housing.
- the rod swirls in these two bearings and the assembly has good mechanical robustness and makes it possible to take up forces in the axial and radial directions.
- the internal and external threads are fine pitch threads, the pitch of the threads PF being less than 12% of the diameter of the rod D3.
- the external diameter D3 of the rod can be between 8 cm and 16 cm, preferably for example between 10 cm and 12 cm.
- the invention also relates to a transmission for a motor vehicle comprising a locking device as described above.
- FIG.1 schematically illustrates an example of a parking brake, with a lifting view, according to the present invention
- FIG.2 shows a partial view of the threaded rod with opposing screw threads
- FIG.3 shows a cross-sectional view of the rod and a locking member with the translational guide
- FIG.4 schematically illustrates an embodiment according to the invention with the parking brake function not engaged
- FIG.5 schematically illustrates an embodiment according to the invention with the parking brake function engaged
- FIG.6 is similar to Figure 5 and schematically illustrates a particular situation before blocking
- FIG.7 illustrates the inclined orientation of the fingers of the locking organs.
- Figure 1 shows an exemplary embodiment of a blocking device as proposed.
- the blocking device is arranged in a transmission housing denoted 9.
- the transmission may be an automatic gearbox transmission, without however excluding the case of a manually controlled gearbox.
- the transmission may also be an electric or hybrid vehicle transmission.
- the drive train comprises an engine, whether internal combustion or electric, a transmission comprising a reducer with, where appropriate, several selectable reduction ratios, a differential and two wheel shafts each connected to the respective wheels of an axle.
- the casing 9 contains various gears and pinions.
- FIG. 1 illustrates a transmission gear marked 81 permanently engaged via its peripheral teeth 81a with a toothed wheel 8. It is the toothed wheel 8 which will be blocked in certain cases of use by the device which will be described later.
- the toothed wheel 8, via the transmission gear 81 is generally rotationally secured to the wheels of an axle or at least to a wheel shaft. The locking of the toothed wheel 8 therefore allows immobilization of the wheels of the axle of the vehicle.
- the toothed wheel 8 is mounted to rotate around a wheel axis denoted W.
- the toothed wheel 8 is mounted on a shaft, rotating or not, linked to the casing 9.
- the gear wheel 8 may comprise 10 teeth as illustrated in the figures. Generally, the number of teeth on the gear wheel 8 is between 10 and 20. For example, the number of teeth on the gear wheel may be 12, or the number of teeth on the gear wheel may be 16.
- the teeth are of trapezoidal profile with steep flanks.
- the flanks 87 may be parallel to each other.
- the outer diameter D8 of the gear wheel 8 may be between 10 cm and 25 cm, for example preferably between 16 cm and 20 cm.
- the gear wheel 8 is made of metal like a conventional pinion or gear.
- the locking device comprises a rod 3.
- the rod 3 is rotatably mounted in the housing around a rod axis denoted A.
- the rod 3 is made of , for example steel.
- the rod 3 comprises a first journal in the vicinity of its first end on the drive member side, and a second journal at its second end.
- the first journal is received in a bearing 34 of the drive member 4.
- the second journal is received in an opposite bearing 39.
- the bearing 39 can be connected by a support 38 to the casing or can be integrated directly into a bored shape of the casing casting 9.
- the pivoting in the bearings is lubricated by the oil present in the transmission housing by splashing effect of the moving parts.
- the rod 3 is further immobilized along the axis A by the bearings.
- the only degree of freedom conferred to the rod 3 is rotation about the rod axis A.
- the rod 3 comprises two threaded portions with opposite pitches. More precisely, the rod 3 comprises a first portion 31 equipped with an external thread 31a with a right-hand pitch and a second portion 32 equipped with an external thread 32a with a left-hand pitch.
- the internal and external threads are preferably fine pitch threads.
- the thread pitch denoted PF corresponds to the distance between two successive threads.
- the pitch PF is less than 12% of the diameter of the rod D3.
- the pitch PF is less than 1 millimeter.
- a non-threaded portion 30 may be interposed between the two threaded portions. It is noted that the invention covers any type of thread including standard pitch threads.
- the outer diameter D3 of the rod 3 may be between 8 mm and 16 mm, for example preferably between 10 mm and 12 mm.
- the locking device comprises a first locking member 1 and a second locking member 2.
- the first locking member 1 comprises a first sleeve 10 centered on the rod axis A.
- the first locking member 1 comprises a projection here called first projection 5 which extends radially outwards from the first sleeve 10.
- the first projection is formed as a finger or an arm. This finger or arm extends from the sleeve in a direction of axis X1 inclined relative to the rod axis A.
- the axis X1 is inclined relative to the rod axis A at an angle 0. 0 is between 35° and 60°. Preferably 0 is between 40° and 50°.
- the first sleeve 10 comprises an internal thread, adapted to cooperate by form complementarity with the external thread 31a of the rod.
- the first projection comprises a free end 51 forming a stop for stopping a tooth of the toothed wheel in a first direction of rotation S1 (see FIG. 4).
- the first projection comprises a part furthest from the rod axis called the dorsal portion of the finger denoted 52, the usefulness of which we will see later.
- the second locking member 2 comprises a second sleeve 20 centered on the rod axis A.
- the second locking member 2 comprises a projection here called second projection 6 which extends radially outwards from the second sleeve 20.
- the second sleeve 20 comprises an internal thread, with left-hand thread, adapted to cooperate by form complementarity with the external thread 32a of the rod.
- the second projection 6 comprises a free end 61 forming a stop for stopping a tooth of the toothed wheel (the same tooth or another) in a second direction of rotation S2.
- the rod axis A is separated from the wheel axis W by a distance denoted D6.
- the axes X1 and X2 intersect at a point P12, separated from the rod axis A by a distance D7.
- D7 can be between 25% of D6 and 50% of D6 depending on the wheel diameter.
- the device comprises guide elements 7. As illustrated in FIG. 3, the finger 5 extends between a first bearing surface 71 which prevents it from rotating to the left and a second bearing surface 72 which prevents it from rotating to the right. Other types of guidance are not excluded, such as, for example, tabs arranged diametrically opposite the fingers.
- the guide elements 7 prevent the rotation of the locking members 1, 2 around the rod axis A but allow the translation of the locking members 1, 2 along the rod axis A.
- the first and second projections 5,6 generally extend in a radial plane denoted PR perpendicular to the wheel axis W. The plane PR passes through the axis A.
- the configuration of the assembly of the elements is substantially flat in the Y direction. Indeed, the toothed wheel 8 and the fingers 5 and 6 extend on either side of the radial median plane PR. Furthermore, the grip of the elements, rod 3 and locking members (1 and 2), does not exceed the external diameter D1 of the sleeves. Such an assembly is therefore easy to install in a narrow space of a transmission.
- the locking members have internal threads corresponding respectively to the thread of the rod.
- the first locking member contains an internal thread with a right-hand thread while the second locking member contains an internal thread with a left-hand thread.
- the rod diameter can be reduced ( ⁇ D3) beyond the threaded portions in order to be able to insert the sleeves of the locking members from the end of the rod to their position in the threaded portions 31, 32.
- the motor member 4 may be, for example, an electric motor.
- the motor member may comprise a reducer, the member is then a geared motor.
- the output shaft e.g. the rotor of the motor or the output shaft of the reducer, is engaged with the rod 3 for example by a splined interface.
- a female sleeve is secured to the rotor of the motor 4.
- the end of the rod on this side is of the male splined type.
- Other solutions, such as keying or the use of a through pin, are also possible.
- the drive member 4 can be arranged outside the casing 9, the rod 3 can be more or less long depending on the integration configurations. This flexibility of positioning of the drive member facilitates the possibilities of integrating the proposed solution into a given transmission configuration.
- the drive member is controlled by a control unit not shown in the figures.
- Said control unit receives the vehicle speed information and can control the engagement of the parking brake when the vehicle speed is zero or alternatively when the vehicle speed is below a very low threshold, for example below 3 km/h.
- a bending of the finger is provided by pressure on the back 52 of the finger. As illustrated in FIG. 6, it is the second finger 6 of the second blocking member 2 which bends upwards when a tooth passes in contact with it, the wheel 8 rotating in a clockwise direction.
- the rod may also buckle a little when a tooth passes over the back of a finger. Such flexibility may be sought to result in the trapping of a tooth even if the fingers in their approach stroke have not already gripped a tooth.
- the rod and the locking members are made of metal, e.g. steel.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- General Details Of Gearings (AREA)
- Gear-Shifting Mechanisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2305754A FR3149660B1 (fr) | 2023-06-07 | 2023-06-07 | Dispositif de blocage d'une transmission de chaîne cinématique dans un véhicule automobile |
| FRFR2305754 | 2023-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024251838A1 true WO2024251838A1 (fr) | 2024-12-12 |
Family
ID=87974668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/065503 Pending WO2024251838A1 (fr) | 2023-06-07 | 2024-06-05 | Dispositif de blocage d'une transmission de chaîne cinématique dans un véhicule automobile |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR3149660B1 (fr) |
| WO (1) | WO2024251838A1 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10316949A1 (de) * | 2003-04-12 | 2004-11-11 | Daimlerchrysler Ag | Parksperre für ein Kraftfahrzeug |
| US20160223082A1 (en) | 2013-10-10 | 2016-08-04 | Bayerische Motoren Werke Aktiengesellschaft | Parking Lock for Motor Vehicles |
| CN107387750A (zh) * | 2017-08-30 | 2017-11-24 | 北京新能源汽车股份有限公司 | 驻车机构以及车辆 |
-
2023
- 2023-06-07 FR FR2305754A patent/FR3149660B1/fr active Active
-
2024
- 2024-06-05 WO PCT/EP2024/065503 patent/WO2024251838A1/fr active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10316949A1 (de) * | 2003-04-12 | 2004-11-11 | Daimlerchrysler Ag | Parksperre für ein Kraftfahrzeug |
| US20160223082A1 (en) | 2013-10-10 | 2016-08-04 | Bayerische Motoren Werke Aktiengesellschaft | Parking Lock for Motor Vehicles |
| CN107387750A (zh) * | 2017-08-30 | 2017-11-24 | 北京新能源汽车股份有限公司 | 驻车机构以及车辆 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3149660A1 (fr) | 2024-12-13 |
| FR3149660B1 (fr) | 2026-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3240964B1 (fr) | Actionneur de frein a reduction differentielle, frein ou etrier de frein incluant un tel actionneur, et procede de desserrage d'un tel frein | |
| FR3063532A1 (fr) | Actionneur equipe d’un systeme de no back a zone d’inhibition | |
| FR3031154A1 (fr) | Actionneur de frein a reduction differentielle, frein ou etrier de frein incluant un tel actionneur, et procede de desserrage d'un tel frein | |
| WO2022106681A1 (fr) | Dispositif d'entraînement électrique d'un essieu d'un vehicule | |
| FR3098267A1 (fr) | Vis à rouleaux satellites a dentures asymétriques | |
| FR2963398A1 (fr) | Transmission planetaire comportant une roue solaire et un porte-satellites | |
| FR2956176A1 (fr) | Transmission a broche | |
| WO2020239320A1 (fr) | Dispositif de blocage de boite de vitesses | |
| WO2024251838A1 (fr) | Dispositif de blocage d'une transmission de chaîne cinématique dans un véhicule automobile | |
| EP3187759A1 (fr) | Dispositif de transmission de mouvement par engrenage et système d'actionnement le comprenant | |
| FR3056160A1 (fr) | Transmission pour vehicule automobile a propulsion electrique | |
| FR3072439B1 (fr) | Boite de vitesses de vehicule automobile comportant un blocage de fourchette dans la position de point mort | |
| WO2023198803A1 (fr) | Dispositif d'entraînement différentiel | |
| FR2970311A1 (fr) | Frein de parking d'une boite de vitesses | |
| EP0334718B1 (fr) | Dispositif pour le réglage angulaire progressif du calage d'un volant sur un arbre avec limitation de course | |
| FR3104664A1 (fr) | Boîte de vitesses automatique avec fonction parking renforcée | |
| FR3141738A1 (fr) | Agencement pour l’entraînement d’une vis de reglage | |
| EP3963234B1 (fr) | Réducteur épicycloïdal comprenant au moins une pièce de transmission d'effort axial formant un chemin d'effort radialement excentré | |
| FR3149661A1 (fr) | Ensemble de transmission dans un véhicule automobile et comprenant un dispositif de blocage | |
| EP4491465A1 (fr) | Mécanisme de blocage | |
| EP4678446A1 (fr) | Module de différentiel | |
| WO2025119655A1 (fr) | Mécanisme de blocage | |
| FR2875884A1 (fr) | Transmission a pignons dentes | |
| FR3164150A1 (fr) | Module de différentiel | |
| FR3045123A1 (fr) | Differentiel autobloquant pour un train de roues d’un vehicule |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 24731342 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2024731342 Country of ref document: EP |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| ENP | Entry into the national phase |
Ref document number: 2024731342 Country of ref document: EP Effective date: 20260107 |
|
| ENP | Entry into the national phase |
Ref document number: 2024731342 Country of ref document: EP Effective date: 20260107 |
|
| ENP | Entry into the national phase |
Ref document number: 2024731342 Country of ref document: EP Effective date: 20260107 |
|
| ENP | Entry into the national phase |
Ref document number: 2024731342 Country of ref document: EP Effective date: 20260107 |
|
| ENP | Entry into the national phase |
Ref document number: 2024731342 Country of ref document: EP Effective date: 20260107 |