US20080257998A1 - Belt retractor - Google Patents
Belt retractor Download PDFInfo
- Publication number
- US20080257998A1 US20080257998A1 US12/148,081 US14808108A US2008257998A1 US 20080257998 A1 US20080257998 A1 US 20080257998A1 US 14808108 A US14808108 A US 14808108A US 2008257998 A1 US2008257998 A1 US 2008257998A1
- Authority
- US
- United States
- Prior art keywords
- belt
- reel
- coupling disk
- clip spring
- belt reel
- 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.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/40—Belt retractors, e.g. reels self-locking in an emergency responsive only to vehicle movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/405—Belt retractors, e.g. reels self-locking in an emergency responsive to belt movement and vehicle movement
Definitions
- the invention relates to a belt retractor for a vehicle safety belt.
- the belt retractor serves to make the vehicle safety belt available to a vehicle occupant.
- the vehicle safety belt In the normal operating state the vehicle safety belt may be unwound from a belt reel or wound up again on the same.
- a locking mechanism which is capable of blocking the belt reel in a manner sensitive to the belt webbing or in a vehicle-sensitive manner, hence dependent on parameters such as the belt webbing or vehicle acceleration.
- belt retractors For the vehicle or belt webbing sensitive blocking of the belt reel modern belt retractors have a coupling disk which rotates along with the belt reel in the normal operating state.
- the coupling disk For the vehicle-sensitive activation of the locking mechanism the coupling disk is provided with a toothing, a locking element of a vehicle-sensitive sensor being able to engage in the toothing.
- An inertial element is connected to the coupling disk for the belt webbing-sensitive activation of the locking mechanism. If the coupling disk remains behind the rotation of the belt reel on account of the mass inertia, it causes a locking pawl to pivot into a locking toothing of the frame by means of an actuating element.
- a belt retractor for a vehicle safety belt with a frame has a belt reel rotatably mounted in the frame, a coupling disk rotatably mounted relative to the belt reel, and a clip spring which is attached to the belt reel and to the coupling disk.
- a clip spring which determines the basic position of the coupling disk with respect to the belt reel.
- the clip spring is distinguished by a plurality of advantages.
- the production of clip springs is simple, since among other things the spring force of the clip springs is solely adjusted by their tensioning, whilst in the case of spiral springs the spring force depends on the number of the spirals, the diameter thereof, etc.
- the material usage with clip springs is small, which is why clip springs are low-priced.
- the transport of clip springs is simple, since they cannot interlock. Therefore, no blister packages are required.
- the moment when the locking pawl is caused to engage is determined by the torque caused by the clip spring and the contact friction of the coupling disk on the reel axle.
- this frictional force is adjustable more variably than in the prior art.
- a torque and a force between the coupling disk and the reel axle may be applied by the systematic tensioning in the state of installation.
- the contact point of the clip spring to the coupling disk lies opposite the contact point of the locking pawl and is mounted rotatably.
- the radial component of the tensioning force may, for example, be used to change the amount and the direction of the frictional force caused by the weight of the locking pawl such that the frictional force depends less on the position of the locking pawl.
- a frictional force whose amount is more constant than in the prior art therefore results in a more defined breakaway in all positions of the locking pawl.
- spiral springs used in the prior art disturbing noises occurred on account of the spirals striking against one another, which is known as “spring whizzing” and which is absent in clip springs.
- clip springs may be simulated more easily. It is, moreover, advantageous that clip springs have a higher resistance to the action of a tensioner, since they do not become entangled in a higher acceleration.
- the clip spring is configured symmetrically and therefore does not have to be oriented relative to the reel axle prior to the installation, i.e., it does not have to be rotated. Therefore, the installation is simple.
- the belt reel includes a reel axle
- the coupling disk is mounted on the reel axle, the clip spring being attached to the belt reel and to the coupling disk such that it does not engage the reel axle. Since the clip spring does not engage the reel axle, the latter is not stressed, and disturbing noises are avoided.
- FIG. 1 shows an exploded view of a part of a belt retractor in accordance with the invention
- FIG. 2 shows a perspective side view of a part of the belt retractor of FIG. 1 .
- FIG. 3 shows a side view of a part of the belt retractor of FIG. 1 .
- FIGS. 1 to 3 show a part of a belt retractor including a belt reel 10 .
- the belt reel 10 is rotatably mounted about a reel axle 12 in a frame (not shown).
- a coupling disk 14 which is coaxially connected to the belt reel 10 .
- the basic position of the coupling disk 14 with respect to the belt reel 10 is determined by a clip spring 16 , the first end of the clip spring 16 being attached to the coupling disk 14 and its second end being attached to the belt reel 10 ( FIGS. 2 and 3 ), in particular, in such a manner that the clip spring 16 does not engage the reel axle 12 and such that it is tensioned.
- the clip spring 16 is directly attached to the coupling disc 14 .
- the ends of the clip spring 16 are bent in the shape of hooks (the hooks 17 ).
- the clip spring 16 is eccentrically attached to the belt reel 10 and to the coupling disk 14 (with respect to the reel axle 12 ) and rotatably supported on the coupling disk 14 .
- the coupling disk 14 On its outer periphery the coupling disk 14 is provided with a toothing 18 which may cooperate with a vehicle-sensitive sensor element (not shown).
- the coupling disk 14 is integrally connected to an inertial element (not shown). Along with the inertial element the coupling disk 14 forms the sensor element that is sensitive to the belt webbing and that will be described in more detail hereinafter.
- An actuating element 22 ( FIGS. 2 and 3 ) is connected to the coupling disk 14 via a connecting arm.
- the actuating element 22 engages a locking pawl 20 , in particular into a control contour 24 which is situated within the locking pawl 20 .
- the locking pawl 20 which is disposed in a recessed pocket of the belt reel 10 , is configured such that it may be caused to engage in a locking toothing (not shown) which is provided on the frame. In so doing, the bearing point of the locking pawl 20 substantially lies opposite (with regard to the axis of rotation of the belt reel 10 and the coupling disk 14 ) the bearing point of the clip spring 16 on the coupling disk 14 .
- the coupling disk 14 forms the sensor element that is sensitive to the belt webbing.
- the coupling disk 14 stops or trails behind the rotation of the belt reel 10 .
- the actuating element 22 which is connected to the coupling disk 14 via the connecting arm, shifts such that because of the engagement in the control contour 24 of the locking pawl 20 it pivots the locking pawl 20 in such a manner that the same is caused to engage in the locking toothing of the frame.
- the radial component of the tensioning force of the clip spring 16 is used to change the amount and the direction of the frictional force caused by the weight of the locking pawl 20 such that the same depends less on the position of the locking pawl 20 .
- a frictional force whose amount is more constant than in the prior art therefore results in a more defined breakaway in all positions of the locking pawl 20 .
Abstract
A belt retractor for a vehicle safety belt with a frame has a belt reel (10) rotatably mounted in the frame, a coupling disk (14) rotatably mounted relative to the belt reel (10), and a clip spring (16) which is attached to the belt reel (10) and to the coupling disk (14).
Description
- The invention relates to a belt retractor for a vehicle safety belt.
- The belt retractor serves to make the vehicle safety belt available to a vehicle occupant. In the normal operating state the vehicle safety belt may be unwound from a belt reel or wound up again on the same. There is provided a locking mechanism which is capable of blocking the belt reel in a manner sensitive to the belt webbing or in a vehicle-sensitive manner, hence dependent on parameters such as the belt webbing or vehicle acceleration. For the vehicle or belt webbing sensitive blocking of the belt reel modern belt retractors have a coupling disk which rotates along with the belt reel in the normal operating state. For the vehicle-sensitive activation of the locking mechanism the coupling disk is provided with a toothing, a locking element of a vehicle-sensitive sensor being able to engage in the toothing. An inertial element is connected to the coupling disk for the belt webbing-sensitive activation of the locking mechanism. If the coupling disk remains behind the rotation of the belt reel on account of the mass inertia, it causes a locking pawl to pivot into a locking toothing of the frame by means of an actuating element.
- DE 102 13 248 A1 shows a coupling disk whose basic position with respect to the belt reel is determined by a spiral spring. The production of such spiral springs is complicated and therefore expensive.
- It is the object of the invention to provide a belt retractor that can readily and cost-effectively be manufactured.
- According to the invention, a belt retractor for a vehicle safety belt with a frame has a belt reel rotatably mounted in the frame, a coupling disk rotatably mounted relative to the belt reel, and a clip spring which is attached to the belt reel and to the coupling disk.
- According to the invention there is used a clip spring which determines the basic position of the coupling disk with respect to the belt reel. The clip spring is distinguished by a plurality of advantages. The production of clip springs is simple, since among other things the spring force of the clip springs is solely adjusted by their tensioning, whilst in the case of spiral springs the spring force depends on the number of the spirals, the diameter thereof, etc. The material usage with clip springs is small, which is why clip springs are low-priced. Besides, the transport of clip springs is simple, since they cannot interlock. Therefore, no blister packages are required. When clip springs are used in belt retractors, the moment when the locking pawl is caused to engage is determined by the torque caused by the clip spring and the contact friction of the coupling disk on the reel axle. In the belt retractor in, accordance with the invention this frictional force is adjustable more variably than in the prior art. Depending on the forceless geometry of the clip spring (production state) a torque and a force between the coupling disk and the reel axle may be applied by the systematic tensioning in the state of installation. In the belt retractor in accordance with the invention the contact point of the clip spring to the coupling disk lies opposite the contact point of the locking pawl and is mounted rotatably. The radial component of the tensioning force may, for example, be used to change the amount and the direction of the frictional force caused by the weight of the locking pawl such that the frictional force depends less on the position of the locking pawl. A frictional force whose amount is more constant than in the prior art therefore results in a more defined breakaway in all positions of the locking pawl. Besides, in spiral springs used in the prior art disturbing noises occurred on account of the spirals striking against one another, which is known as “spring whizzing” and which is absent in clip springs. Furthermore, clip springs may be simulated more easily. It is, moreover, advantageous that clip springs have a higher resistance to the action of a tensioner, since they do not become entangled in a higher acceleration.
- Preferably, the clip spring is configured symmetrically and therefore does not have to be oriented relative to the reel axle prior to the installation, i.e., it does not have to be rotated. Therefore, the installation is simple.
- Preferably, the belt reel includes a reel axle, and the coupling disk is mounted on the reel axle, the clip spring being attached to the belt reel and to the coupling disk such that it does not engage the reel axle. Since the clip spring does not engage the reel axle, the latter is not stressed, and disturbing noises are avoided.
-
FIG. 1 shows an exploded view of a part of a belt retractor in accordance with the invention, -
FIG. 2 shows a perspective side view of a part of the belt retractor ofFIG. 1 , and -
FIG. 3 shows a side view of a part of the belt retractor ofFIG. 1 . -
FIGS. 1 to 3 show a part of a belt retractor including abelt reel 10. Thebelt reel 10 is rotatably mounted about areel axle 12 in a frame (not shown). - There is provided a
coupling disk 14 which is coaxially connected to thebelt reel 10. The basic position of thecoupling disk 14 with respect to thebelt reel 10 is determined by aclip spring 16, the first end of theclip spring 16 being attached to thecoupling disk 14 and its second end being attached to the belt reel 10 (FIGS. 2 and 3 ), in particular, in such a manner that theclip spring 16 does not engage thereel axle 12 and such that it is tensioned. Theclip spring 16 is directly attached to thecoupling disc 14. For the attachment to thecoupling disk 14 and to thebelt reel 10, the ends of theclip spring 16 are bent in the shape of hooks (the hooks 17). Theclip spring 16 is eccentrically attached to thebelt reel 10 and to the coupling disk 14 (with respect to the reel axle 12) and rotatably supported on thecoupling disk 14. - On its outer periphery the
coupling disk 14 is provided with atoothing 18 which may cooperate with a vehicle-sensitive sensor element (not shown). - The
coupling disk 14 is integrally connected to an inertial element (not shown). Along with the inertial element thecoupling disk 14 forms the sensor element that is sensitive to the belt webbing and that will be described in more detail hereinafter. - An actuating element 22 (
FIGS. 2 and 3 ) is connected to thecoupling disk 14 via a connecting arm. The actuatingelement 22 engages alocking pawl 20, in particular into acontrol contour 24 which is situated within thelocking pawl 20. Thelocking pawl 20, which is disposed in a recessed pocket of thebelt reel 10, is configured such that it may be caused to engage in a locking toothing (not shown) which is provided on the frame. In so doing, the bearing point of thelocking pawl 20 substantially lies opposite (with regard to the axis of rotation of thebelt reel 10 and the coupling disk 14) the bearing point of theclip spring 16 on thecoupling disk 14. - Along with the inertial element the
coupling disk 14 forms the sensor element that is sensitive to the belt webbing. In a sudden rotation of thebelt reel 10 thecoupling disk 14 stops or trails behind the rotation of thebelt reel 10. On account of the relative rotation between thebelt reel 10 and thecoupling disk 14 the actuatingelement 22, which is connected to thecoupling disk 14 via the connecting arm, shifts such that because of the engagement in thecontrol contour 24 of thelocking pawl 20 it pivots thelocking pawl 20 in such a manner that the same is caused to engage in the locking toothing of the frame. - The radial component of the tensioning force of the
clip spring 16 is used to change the amount and the direction of the frictional force caused by the weight of thelocking pawl 20 such that the same depends less on the position of thelocking pawl 20. A frictional force whose amount is more constant than in the prior art therefore results in a more defined breakaway in all positions of thelocking pawl 20.
Claims (5)
1. A belt retractor for a vehicle safety belt with a frame, said belt retractor including
a belt reel (10) rotatably mounted in said frame,
a coupling disk (14) rotatably mounted relative to said belt reel (10), and
a clip spring (16) which is attached to said belt reel (10) and to said coupling disk (14).
2. The belt retractor according to claim 1 , wherein said clip spring (16) is configured symmetrically.
3. The belt retractor according to claim 1 , wherein said belt reel (10) includes a reel axle (12), and said coupling disk (14) is mounted on said reel axle (12), said clip spring (16) being attached to said belt reel (10) and to said coupling disk (14) such that it does not engage said reel axle (12).
4. The belt retractor according to claim 1 , wherein said clip spring (16) is eccentrically attached to at least one of said belt reel (10) and said coupling disk (14).
5. The belt retractor according to claim 1 , wherein said coupling disk (14) includes an actuating element (22), and in that a locking pawl (20) is provided, said actuating element (22) being adapted to engage said locking pawl (20).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007019123A DE102007019123A1 (en) | 2007-04-23 | 2007-04-23 | retractor |
DE102007019123.7 | 2007-04-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080257998A1 true US20080257998A1 (en) | 2008-10-23 |
Family
ID=39777381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/148,081 Abandoned US20080257998A1 (en) | 2007-04-23 | 2008-04-15 | Belt retractor |
Country Status (3)
Country | Link |
---|---|
US (1) | US20080257998A1 (en) |
JP (1) | JP2008265748A (en) |
DE (1) | DE102007019123A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100214454A1 (en) * | 2009-02-23 | 2010-08-26 | Sony Corporation | Solid-state imaging device and electronic apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009010157A1 (en) | 2009-02-23 | 2010-08-26 | Trw Automotive Gmbh | Bow spring, particularly for seat belt retractor of vehicle seat belt, has multiple straight-lined segments and curved sections provided between segments, where straight-lined segments have same lengths |
DE102012018475A1 (en) | 2011-10-05 | 2013-04-11 | Trw Automotive Gmbh | Method for adjusting belt-locking level of belt retractor of motor vehicle, involves adjusting characteristic of spring system for rotation of inertia element relative to belt reel after coupling |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3698657A (en) * | 1970-09-01 | 1972-10-17 | Horst Guenter Kirchhoff | Inertia operated locking retractor |
US3905562A (en) * | 1973-05-25 | 1975-09-16 | Kangol Magnet Ltd | Vehicle safety belt retractors |
US20040079827A1 (en) * | 2002-08-09 | 2004-04-29 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing retractor |
US20040149852A1 (en) * | 2003-01-31 | 2004-08-05 | Trw Occupant Restraint Systems Gmbh & Co. Kg | Belt spool for a safety belt retractor |
US20060237573A1 (en) * | 2005-04-22 | 2006-10-26 | Key Safety Systems, Inc. | Seat belt retractor with improved web sensor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4058271A (en) * | 1976-03-02 | 1977-11-15 | Susumu Ubukata | Emergency locking retractor for seat belt assemblies |
DE4438097A1 (en) * | 1994-10-25 | 1996-05-02 | Trw Repa Gmbh | Belt retractor with integrated belt tensioner and energy converter |
DE20109534U1 (en) | 2001-06-07 | 2001-10-18 | Trw Repa Gmbh | Belt retractor |
-
2007
- 2007-04-23 DE DE102007019123A patent/DE102007019123A1/en not_active Withdrawn
-
2008
- 2008-04-15 US US12/148,081 patent/US20080257998A1/en not_active Abandoned
- 2008-04-23 JP JP2008112162A patent/JP2008265748A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3698657A (en) * | 1970-09-01 | 1972-10-17 | Horst Guenter Kirchhoff | Inertia operated locking retractor |
US3905562A (en) * | 1973-05-25 | 1975-09-16 | Kangol Magnet Ltd | Vehicle safety belt retractors |
US20040079827A1 (en) * | 2002-08-09 | 2004-04-29 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Webbing retractor |
US20040149852A1 (en) * | 2003-01-31 | 2004-08-05 | Trw Occupant Restraint Systems Gmbh & Co. Kg | Belt spool for a safety belt retractor |
US20060237573A1 (en) * | 2005-04-22 | 2006-10-26 | Key Safety Systems, Inc. | Seat belt retractor with improved web sensor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100214454A1 (en) * | 2009-02-23 | 2010-08-26 | Sony Corporation | Solid-state imaging device and electronic apparatus |
US8243146B2 (en) * | 2009-02-23 | 2012-08-14 | Sony Corporation | Solid-state imaging device and electronic apparatus |
US8493452B2 (en) | 2009-02-23 | 2013-07-23 | Sony Corporation | Solid-state imaging device and electronic apparatus having a light blocking part |
USRE46729E1 (en) | 2009-02-23 | 2018-02-20 | Sony Corporation | Solid-state imaging device and electronic apparatus having a light blocking part |
USRE46769E1 (en) | 2009-02-23 | 2018-03-27 | Sony Corporation | Solid-state imaging device and electronic apparatus having a light blocking part |
Also Published As
Publication number | Publication date |
---|---|
JP2008265748A (en) | 2008-11-06 |
DE102007019123A1 (en) | 2008-10-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TRW AUTOMOTIVE GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BLUM, HERBERT;KNOESS, STEFAN;REEL/FRAME:020852/0842 Effective date: 20080407 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |