DE202016104581U1 - Parking brake - Google Patents
Parking brake Download PDFInfo
- Publication number
- DE202016104581U1 DE202016104581U1 DE202016104581.9U DE202016104581U DE202016104581U1 DE 202016104581 U1 DE202016104581 U1 DE 202016104581U1 DE 202016104581 U DE202016104581 U DE 202016104581U DE 202016104581 U1 DE202016104581 U1 DE 202016104581U1
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- Prior art keywords
- parking brake
- transmission
- clutch
- coupling
- brake according
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
- F16D65/183—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes with force-transmitting members arranged side by side acting on a spot type force-applying member
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2123/00—Multiple operation forces
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
- F16D2125/40—Screw-and-nut
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/44—Mechanical mechanisms transmitting rotation
- F16D2125/46—Rotating members in mutual engagement
- F16D2125/50—Rotating members in mutual engagement with parallel non-stationary axes, e.g. planetary 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2127/00—Auxiliary mechanisms
- F16D2127/06—Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
Abstract
Feststellbremse mit einem Bremskörper (14), der durch ein Stellelement (18) gegen eine Reibfläche eines zu bremsenden Bauteils (10) anstellbar ist, bei der das Stellelement (18) über ein Getriebe (20; 20') und eine schaltbare Kupplung (22) mit einem Motor (24) in Antriebsverbindung steht und den Bremskörper (14) antreibt und das Getriebe (20; 20') bei einem Kraftfluss vom Stellelement (18) zum Motor (24) selbsthemmungsfrei ist, dadurch gekennzeichnet, dass die Kupplung (22) eine eingangsabhängig geschaltete Kupplung mit einem feststehenden Element (26), einem Ausgangselement (28), einem durch den Motor (24) antreibbaren Löseelement (38) und einer Klemmeinrichtung (32) ist, deren Klemmeinrichtung bei Krafteinleitung über das Löseelement (38) eine gemeinsame Drehung des Löseelements (38) und des Ausgangselements (28) in beiden Drehrichtungen zulässt und bei Krafteinleitung über das Ausgangselement (28) in Hemmung geht.Parking brake with a brake body (14), which can be adjusted by an adjusting element (18) against a friction surface of a component (10) to be braked, in which the actuating element (18) via a transmission (20, 20 ') and a switchable clutch (22 ) is in drive connection with a motor (24) and drives the brake body (14) and the transmission (20, 20 ') is self-locking free in the event of a power flow from the control element (18) to the motor (24), characterized in that the clutch (22 ) An input-dependent switched clutch with a fixed element (26), an output element (28), a by the motor (24) drivable release element (38) and a clamping device (32), the clamping device upon force on the release element (38) a allows common rotation of the release element (38) and the output member (28) in both directions of rotation and in force application via the output member (28) is inhibited.
Description
Die Erfindung betrifft eine Feststellbremse mit einem Bremskörper, der durch ein Stellelement gegen eine Reibfläche eines zu bremsenden Bauteils anstellbar ist, bei der das Stellelement über ein Getriebe und eine schaltbare Kupplung mit einem Motor in Antriebsverbindung steht und den Bremskörper antreibt und das Getriebe bei einem Kraftfluss von dem Stellelement zum Motor selbsthemmungsfrei ist. The invention relates to a parking brake with a brake body which can be adjusted by a control element against a friction surface of a component to be braked, in which the actuating element via a transmission and a switchable clutch with a motor is in drive connection and drives the brake body and the transmission at a power flow from the actuator to the motor is self-locking.
Eine solche Feststellbremse kann beispielsweise als Parkbremse in einem Kraftfahrzeug eingesetzt werden. Such a parking brake can be used for example as a parking brake in a motor vehicle.
In
Aufgabe der Erfindung ist es, eine Feststellbremse mit erhöhter Betriebssicherheit zu schaffen. The object of the invention is to provide a parking brake with increased reliability.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Kupplung eine eingangsabhängig geschaltete Kupplung mit einem feststehenden Element, einem Ausgangselement, einem durch den Motor antreibbaren Löseelement und einer Klemmeinrichtung ist, deren Klemmeinrichtung bei Krafteinleitung über das Löseelement eine gemeinsame Drehung des Löseelements und des Ausgangselements in beiden Drehrichtungen zulässt und bei Krafteinleitung über das Ausgangselement in Hemmung geht. This object is achieved in that the clutch is an input-dependent clutch with a fixed element, an output element, a drivable by the motor release element and a clamping device, the clamping device upon application of force through the release element, a common rotation of the release element and the output member in both Direction of rotation allows and inhibits the introduction of force via the output element.
Eingangsabhängig geschaltete Kupplungen dieser Art sind grundsätzlich bekannt. Ein Beispiel wird in
Wenn das Löseelement durch das Getriebe oder unmittelbar durch den Motor angetrieben wird, so wird das Antriebsdrehmoment auf das Ausgangselement der Kupplung und durch dieses unmittelbar oder mittelbar über das Getriebe auf das Stellelement übertragen, so dass die Bremse betätigt werden kann. Dazu ist keinerlei Schaltvorgang erforderlich und es werden dementsprechend auch keine störungsanfälligen elektromechanischen Komponenten zum Schalten der Kupplung benötigt. Bei einem Kraftfluss in entgegengesetzter Richtung, also vom Stellelement zum Motor, geht die Kupplung in Hemmung, so dass die Bremse in ihrem jeweiligen Zustand bleibt, bis über den Motor wieder ein Antriebsdrehmoment ausgeübt wird. Auf diese Weise lässt sich der Bremskörper in der Bremsposition festhalten. Da die Kupplung eine Drehung des Löseelements und des Ausgangselements in beiden Drehrichtungen zulässt, kann über den Motor auch ein in Löserichtung wirkendes Drehmoment auf das Stellelement übertragen werden, um die Bremse zu lösen. When the release element is driven by the transmission or directly by the engine, the drive torque is transmitted to the output member of the clutch and through this directly or indirectly via the transmission to the actuator, so that the brake can be actuated. For this, no switching operation is required and accordingly no fault-prone electromechanical components for switching the clutch are required. In a power flow in the opposite direction, ie from the actuator to the engine, the clutch is inhibited, so that the brake remains in their respective state until over the engine again a drive torque is applied. In this way, the brake body can be held in the braking position. Since the clutch permits rotation of the release element and the output element in both directions of rotation, a torque acting in the release direction can also be transmitted to the control element via the motor in order to release the brake.
Ein Vorteil der Erfindung besteht darin, dass die Feststellbremse außer dem Motor keine elektromechanischen Komponenten aufzuweisen braucht und somit eine hohe Funktionssicherheit hat. Da das Getriebe nicht selbsthemmend zu sein braucht, lässt sich ein Getriebe mit einem kleinen Untersetzungsverhältnis wählen, insbesondere deutlich kleiner als bei herkömmlichen Schneckengetrieben, so dass eine kurze Schaltzeit auch dann ermöglicht wird, wenn der Motor nur mit verhältnismäßig niedriger Drehzahl läuft. Aufgrund des besseren Wirkungsgrades lasse sich das Getriebe und er Motor kleiner bauen, was zur einer Reduzierung des Gewichts führt. Außerdem lässt sich so der Verschleiß an den mechanischen Komponenten reduzieren. An advantage of the invention is that the parking brake need not have any electromechanical components except the engine and thus has a high reliability. Since the transmission does not need to be self-locking, a transmission with a small reduction ratio can be selected, in particular significantly smaller than in conventional worm gears, so that a short switching time is made possible even when the engine runs only at a relatively low speed. Due to the better efficiency let the gearbox and engine build smaller, resulting in a reduction in weight. It also reduces the wear on the mechanical components.
Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. In einer vorteilhaften Ausführungsform ist die Kupplung eine Klemmrollenkupplung. Das Löseelement kann dann in einem Stück mit einem Abtriebselement des Getriebes ausgebildet sein, das in einem begrenzten Winkelbereich relativ zum Ausgangselement der Kupplung drehbar ist und mit Klauen in Zwischenräume zwischen den Klemmrollen der Kupplung eingreift und dadurch bei Krafteinleitung über das Löseelement ein Blockieren der Klemmrollen verhindert. Advantageous embodiments of the invention are specified in the subclaims. In an advantageous embodiment, the clutch is a pinch roller clutch. The release element can then be formed in one piece with an output element of the transmission, which is rotatable in a limited angular range relative to the output element of the clutch and engages with claws in the intermediate spaces between the pinch rollers of the clutch and thereby prevents blocking of the pinch rollers at force on the release element ,
Bei dem Getriebe kann es sich beispielsweise um ein Planetengetriebe oder ein Stirnradgetriebe handeln. The transmission may be, for example, a planetary gear or a spur gear.
Im folgenden werden Ausführungsbeispiele anhand der Zeichnung näher erläutert. In the following embodiments are explained in detail with reference to the drawing.
Es zeigen: Show it:
Die in
Ein Stellelement
Das Stellelement
Die Kupplung
Während die Innenfläche des feststehenden Teils
Wenn auf das Ausgangselement
Ein Löseelement
Wenn nun in irgendeinem Drehsinn ein Drehmoment auf das Löseelement
Das Getriebe
Wenn die Feststellbremse betätigt werden soll, so wird der Motor
Wenn die Bremse gelöst werden soll, wird der Motor erneut aktiviert, so dass er sich in entgegengesetzter Richtung dreht. Auch dieses Drehmoment wird durch das Getriebe
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 10255192 B4 [0003] DE 10255192 B4 [0003]
- DE 9101110 U1 [0006] DE 9101110 U1 [0006]
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202016104581.9U DE202016104581U1 (en) | 2016-08-22 | 2016-08-22 | Parking brake |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202016104581.9U DE202016104581U1 (en) | 2016-08-22 | 2016-08-22 | Parking brake |
Publications (1)
Publication Number | Publication Date |
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DE202016104581U1 true DE202016104581U1 (en) | 2017-11-24 |
Family
ID=60661982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE202016104581.9U Active DE202016104581U1 (en) | 2016-08-22 | 2016-08-22 | Parking brake |
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DE (1) | DE202016104581U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110143195A (en) * | 2019-04-25 | 2019-08-20 | 格陆博科技有限公司 | A kind of automobile-used self-locking braking force generator system of unmanned logistics |
WO2023217631A1 (en) * | 2022-05-13 | 2023-11-16 | Hitachi Astemo France | Electric brake actuator, brake and assembly method, in particular for an all-electric disc brake |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9101110U1 (en) | 1991-02-01 | 1992-02-27 | Schwarzbich, Jörg, 4800 Bielefeld | Gearbox for the transmission of rotary motion in both directions |
DE4312524A1 (en) * | 1993-04-16 | 1994-10-20 | Bosch Gmbh Robert | Wheel brake for vehicles, in particular for motor vehicles |
WO2000061962A1 (en) * | 1999-04-13 | 2000-10-19 | Continental Teves Ag & Co. Ohg | Partially lined disk brake with electromechanical actuator unit |
DE102005044669A1 (en) * | 2005-09-19 | 2007-03-22 | Robert Bosch Gmbh | Parking brake for a vehicle has a parking brake unit, a drive mechanism and an operating device fitted between the parking brake unit and the drive mechanism |
DE102006000746A1 (en) * | 2006-01-04 | 2007-07-05 | Robert Bosch Gmbh | Adjustable free-wheel for motor vehicle, has outer ring and blocking device cage designed as rotor and stator, where cage has coils so that cage is rotatable with respect to ring in switched-on and off-position by energizing coils |
DE10255192B4 (en) | 2002-11-27 | 2015-03-19 | Robert Bosch Gmbh | Electromechanical brake |
-
2016
- 2016-08-22 DE DE202016104581.9U patent/DE202016104581U1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9101110U1 (en) | 1991-02-01 | 1992-02-27 | Schwarzbich, Jörg, 4800 Bielefeld | Gearbox for the transmission of rotary motion in both directions |
DE4312524A1 (en) * | 1993-04-16 | 1994-10-20 | Bosch Gmbh Robert | Wheel brake for vehicles, in particular for motor vehicles |
WO2000061962A1 (en) * | 1999-04-13 | 2000-10-19 | Continental Teves Ag & Co. Ohg | Partially lined disk brake with electromechanical actuator unit |
DE10255192B4 (en) | 2002-11-27 | 2015-03-19 | Robert Bosch Gmbh | Electromechanical brake |
DE102005044669A1 (en) * | 2005-09-19 | 2007-03-22 | Robert Bosch Gmbh | Parking brake for a vehicle has a parking brake unit, a drive mechanism and an operating device fitted between the parking brake unit and the drive mechanism |
DE102006000746A1 (en) * | 2006-01-04 | 2007-07-05 | Robert Bosch Gmbh | Adjustable free-wheel for motor vehicle, has outer ring and blocking device cage designed as rotor and stator, where cage has coils so that cage is rotatable with respect to ring in switched-on and off-position by energizing coils |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110143195A (en) * | 2019-04-25 | 2019-08-20 | 格陆博科技有限公司 | A kind of automobile-used self-locking braking force generator system of unmanned logistics |
WO2023217631A1 (en) * | 2022-05-13 | 2023-11-16 | Hitachi Astemo France | Electric brake actuator, brake and assembly method, in particular for an all-electric disc brake |
FR3135495A1 (en) * | 2022-05-13 | 2023-11-17 | Hitachi Astemo France | “Electric brake actuator, brake and assembly method, in particular for all-electric disc brake” |
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R163 | Identified publications notified | ||
R207 | Utility model specification | ||
R150 | Utility model maintained after payment of first maintenance fee after three years | ||
R151 | Utility model maintained after payment of second maintenance fee after six years |