Classifications

• • 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
  • B60T7/00—Brake-action initiating means
  • B60T7/02—Brake-action initiating means for personal initiation
  • B60T7/04—Brake-action initiating means for personal initiation foot actuated
  • B60T7/045—Brake-action initiating means for personal initiation foot actuated with locking and release means, e.g. providing parking brake application
• • 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
  • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
  • B60T11/04—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting mechanically
• • 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
  • B60T7/00—Brake-action initiating means
  • B60T7/02—Brake-action initiating means for personal initiation
  • B60T7/08—Brake-action initiating means for personal initiation hand actuated
  • B60T7/10—Disposition of hand control
  • B60T7/102—Disposition of hand control by means of a tilting lever
  • B60T7/104—Disposition of hand control by means of a tilting lever with a locking mechanism
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/20—Control lever and linkage systems
  • Y10T74/20576—Elements
  • Y10T74/20582—Levers
  • Y10T74/20612—Hand
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/20—Control lever and linkage systems
  • Y10T74/20576—Elements
  • Y10T74/20636—Detents
  • Y10T74/20672—Lever engaging rack
  • Y10T74/20684—Lever carried pawl

Definitions

• the invention relates to a locking arrangement for a parking brake for locking a tensioned under brake part according to the preamble of claim 1.
• a first brake member has a toothing, in which a provided on a second brake part pawl engages with an engagement nose and thus secures the two parts against each other in rotational movement.
• a locking arrangement is provided, for example, for locking the brake lever to a lever holder, or for setting a Bremsseilnachstellvorraum when the brake lever is raised and the freewheeling of the adjuster is to be blocked.
• Vibration or the like can be overcome, with the possible consequence that the engagement nose engages in the recess between two adjacent tooth flanks and reaches a stable locking position, but there is a risk that instead the engagement nose slides off and under the tension of the brake cable with the brake lever in the filed
• a metastable position is especially taken when the Tangents at the contacting areas of the engagement nose and the tooth of the toothing are approximately parallel.
• DE 102 12 673 A1 shows a locking arrangement for locking a held under tension of a spring, designed as a cable tensioning disk and pivotable about a main axis brake part, in which a toothing with a plurality of adjacent teeth is provided on the cable tensioning disc.
• a pawl pivotable about a pawl is pivotally mounted on a brake lever which has an engaging end biased toward the teeth engagement nose of three teeth, which is formed such that all three teeth of the engagement lug in evenly spaced coincide with the pitch of the teeth and can fully engage in the teeth.
• the locking arrangement according to the invention for locking a held under tension brake part has on one brake part a toothing with a plurality of adjacent teeth, and on the other brake part a pawl pivotable about a pawl, which has at least one engagement lug which projects at an engagement end of the pawl and biased in the direction of the toothing, so that upon pivoting the engagement nose can effectively prevent reverse rotation by engaging between two adjacent teeth of the toothing.
• the articulation and the toothing are pivotable relative to each other about a main axis, wherein expediently one of the two brake parts is designed to be non-rotatable to the main axis.
• the pawl is in addition to the engagement nose associated with an auxiliary nose, which is arranged spaced from the engagement nose, it being ensured that upon pivoting of the pawl in the direction of the toothing first the auxiliary nose comes into abutment.
• the auxiliary nose forms a kind of auxiliary bearing point about which the engagement nose can pivot a little way, so that the engagement nose is defined guided into a space between two teeth of the toothing.
• the toothing may be formed as a toothed segment.
• the distance of the effective surfaces of the engagement nose and the auxiliary nose so in the case of the embodiment as teeth whose tooth comb is spaced from each other by a value which is different from an integer multiple of the tooth width of a tooth of the toothing , It is ensured that the engagement nose is inserted in a stable position between two teeth of the toothing.
• This is done according to the following principle: If the auxiliary tooth is arranged in a stable position, the pivoting about the auxiliary bearing formed by the auxiliary tooth in the toothing causes a secure and reliable positioning of the engagement lug between two adjacent ones
• the metastable zone which is to be avoided, usually makes no more than a maximum of 15% of a tooth pitch or a tooth width, so that it is ensured that the engagement tooth and the auxiliary tooth do not come into contact with such a metastable zone simultaneously.
• the auxiliary nose is expediently arranged closer to a plane connecting the pawl linkage and the main axis than the engagement nose. Ideally, it is ensured that the plane connecting the two axes, that is to say pawl linkage and main axis, during the depositing movement is punctured by the auxiliary tooth forming an auxiliary bearing in the course of the further placement of the pawl, so that the force acts essentially on the engagement nose and these reliably engages in the toothing. Due to the effective leverage, however, in each case this results in that the force acting on the engagement nose is greater than that which acts on the auxiliary nose.
• the auxiliary nose is spaced from the engagement nose by a plurality of teeth, and precedes the engagement nose with respect to the teeth in tightening direction.
• the distance between the engagement nose and the auxiliary nose constitutes at least several teeth, that is to say the multiple of the pitch or tooth width of the toothing, preferably twice, possibly up to more than five times and as a rule not more than about seven to ten teeth; In general, the distance also depends on the selected tooth pitch, with a non-integer spacing is preferred. It follows that the teeth or the toothed segment is designed to be longer according to this number of teeth, as required for the actual locking.
• the teeth will be anyway equipped with additional teeth in order to hang up a stronger tension with relaxing brake cable can.
• a number of teeth can be selected that corresponds to a tightening angle of 2 °, increased or decreased by an amount less than 1, that is, for example, a value of 2.25 teeth for one tooth per angular degree, or 4.25 teeth for two teeth each angle degrees.
• a value which is a tightening angle of 3 °, 4 ° or 5 ° enlarged or reduced by a fraction smaller than 1.
• a suitable moment is achieved even at a relatively short distance.
• a gap corresponding to a tooth width is provided between the engaging nose and the auxiliary nose.
• this gap will be a non-integer multiple of a tooth width.
• the pawl associated auxiliary nose is preferably disposed on the pawl itself, wherein optionally a pivotable arrangement via a connecting joint or a one-piece design with the pawl is possible.
• the one-piece design has the advantage that a reliable engagement kinematics can be achieved by the known distance to the engagement nose, a specific bearing is not required and the pawl can be easily made.
• the auxiliary nose is narrower than the engagement nose, wherein the engagement nose is usually designed so that it can penetrate fully between two adjacent teeth of the toothing.
• the distance to the auxiliary nose is a non-integer multiple of the tooth width, this leads to full penetration of the engagement lug in the toothing to the fact that the auxiliary nose can not completely penetrate into a corresponding recess between two other teeth of the toothing, but rather from the low point of the tooth Tals moved out between two adjacent teeth becomes.
• the auxiliary nose is formed narrower than the engagement nose, the difference is approximately one-quarter to one-half of the dimensions of the engagement nose. It is particularly alternatively possible to form the engagement lug also much thicker to prevent this ever penetrates into the toothing, especially as a ball or the like, which can be reliably and reproducibly centered by two tooth tips of the toothing and so an auxiliary bearing can define.
• the locking pawl is expediently prestressed in the direction of the toothing, wherein, according to a first embodiment, this can be done by a spring acting on the locking pawl, which is provided only for this purpose.
• the locking pawl can also be designed as a double-armed lever, and the bias can be done by a spring member which biases either formed by a first of the two lever arms pawl against the other lever arm, or in the case of a rigid or semi-rigid configuration of the two Lever arms by a spring which biases the second of the two lever arms, in particular pulls.
• the ratchet linkage is equipped with play, whereby the rolling of the auxiliary nose on the toothing is particularly favored, and it is ensured that it does not come to an unintentional blocking of the rolling motion to the auxiliary linkage especially in the metastable impact situation of the auxiliary nose on the teeth.
• the play in the manner of a slot or an ellipse-shaped eye hole in certain orientations particularly preferred, wherein a noise can be suppressed by an easily deformable socket, but it can be used as a game immanente tolerance in the camp.
• the eye bore may also have a defined gap with respect to the inserted pin, which is preferably provided on the side opposite the auxiliary nose.
• the auxiliary nose is preferably formed tooth-shaped, whereby with the exception of the percentage of low probability metastable contact with the tooth flank of a tooth of the teeth a reliable and reproducible intervention in the teeth takes place to form a momentary positive connection.
• auxiliary nose it is possible to form the auxiliary nose with other geometries, for example as a ball or in Kalottenform or as a small gear segment, which favor the rolling movement particularly.
• the auxiliary nose is arranged closer to the Klinkenanlenkung than the engagement nose, wherein due to the pawl movement when pulled over the teeth, the engagement nose is further disengaged than the auxiliary nose, with the result that the auxiliary nose rattles substantially with noise on the teeth ,
• the characteristic rattle noise can be reduced as in the prior art by split pawls or the like, but preferably also by the fact that the auxiliary nose comprises a damping arrangement, for example, uses the game in the pawl linkage.
• the auxiliary nose can be formed of a particularly resistant and nevertheless soft plastic.
• a damping arrangement may be formed by an attenuator, for example of an elastomeric material, which is arranged in the pawl link and lines a gap, so that the attenuator dampens noise and vibration.
• the attenuator may be formed as a thickened portion of a bush, for example made of Teflon, which lines the gap.
• the bias of the auxiliary nose and the engagement nose by a common spring member, so that the auxiliary nose does not require its own biasing device relative to the engagement nose, as would be the case when the auxiliary nose would be biased automatically.
• the effective force on the engagement lug is greater than on the auxiliary lug, so that the final determination of the locking arrangement is performed by the engagement lug.
• the engagement nose has a tooth projecting in the direction of the toothing, which, when it engages in the toothing, is engaged substantially positively between two adjacent teeth or their mutually facing tooth flanks.
• the engagement nose also as a small toothed segment, in particular as a segment of two teeth, whereby the holding safety on the toothing is further increased, namely by that tooth of the toothing which penetrates between the adjacent teeth of the engagement nose formed as a double tooth , is reliably form-fitting.
• the toothing extends along the circumference of a circle, and thus forms a tooth comb which extends in a circle around the main axis.
• the ratchet linkage can be effectively pivoted about a constant radius which is concentric with the circumference of the toothing.
• it is possible to adapt the gearing to the respectively selected pivoting curve for example, when the pawl is displaced along a curve, as it is achieved for example by a four-bar arrangement.
• the toothing is arranged on a fixed part of a parking brake, in particular, the toothing as a toothed segment, which is fixed to the fixed part, be formed.
• the fixed part can be produced inexpensively, while the particularly wear-resistant toothing as a toothed segment, for example as a cemented carbide sintered part, formed and can be supported on the fixed part.
• the toothing on a moving part, in which case preferably the Klinkenanlenkung is selected to be fixed relative to the moving toothing.
• the locking arrangement for fixing a brake lever is formed on a lever holder of a parking brake, in which case, for example, the teeth on the Lever holder and the pawl is fixed to the brake lever, wherein the brake lever is formed pivotable about the main axis and the toothing around, so that upon completion of the tightening movement of the brake lever, the engagement lug of the pawl locks the brake lever against the teeth of the lever holder.
• a brake member biased against the outgoing direction of a brake shoe constitutes a brake cable adjusting device and is provided with a toothing which is fixed by a pawl when the brake is actuated by the brake operating lever to prevent the brake cable adjuster gives way.
• the pawl can connect the Bremsseilnachstell observed with a brake lever, so that they can be tightened together.
• the brake lever may optionally be configured as a handle for a hand brake or as a pedal for a foot parking brake.
• a parking brake according to the invention is preferably characterized by a locking arrangement according to the invention and has a brake actuating lever, which is arranged pivotably on a lever holder. If the toothing is arranged with a plurality of adjacent teeth on the lever holder, then the pawl is pivotably fixed with the biased against the tooth engagement lug on the brake lever, wherein the brake lever can be locked by engaging in the tooth engagement lug.
• a release device is required by means of which the pawl or the engagement nose can be lifted from the toothing, which is usually designed as a push button on the handle and a occidentalfeststellbremse as a manually operable handle at a Handfeststellbremse is.
• the pawl has in this case the auxiliary nose, which, based on the teeth, the engagement nose is offset by a multiple of the tooth width of the toothing in the braking direction, and thus enables an auxiliary bearing point.
• the pawl is suitably biased by a spring unit in the direction of engagement, wherein the spring unit at the same time can bias the release device against its actuation direction.
• the release device can then advantageously pivot the pawl against the bias of the spring unit, which excludes accidental actuation disengaged.
• the pawl linkage is expediently provided on the brake actuating lever, and the brake actuating lever pivots when tightening the pawl linkage about an at least approximately constant distance to the toothing around it in order to ensure the most uniform forces and uninterrupted locking positions.
• Fig. 1 shows an enlarged view of a teeth with a
• FIG. 2 shows an enlarged section of a trained as a handbrake parking brake.
• Fig. 3 shows a further detail of the parking brake of Fig. 2 in a fixed position.
• the toothing 101 has a plurality of teeth 102 and has an approximately circular segment-like course, wherein a tooth recess 103 is provided between adjacent teeth 102.
• a pawl 201 is pivoted when tightening the parking brake in the direction of arrow A until the brake lever is stored.
• the pawl 201 has in the illustrated embodiment, a double-toothed engagement nose 202, with an upper tooth 202a and a lower tooth 202b.
• This zone Z which is shown as a segment of the radius of the tooth 102, is in principle possible on each tooth in the corresponding part of the pivoting path of the pawl 201 and jeopardizes the safety of the passengers of vehicles equipped with corresponding parking brakes.
• the beginning and end points of the zone Z shown in Fig. 1 correspond to an angular range of about 13.5 °, which angle is expressed as a pivoting angle about the major axis. This means that it should be avoided for the engagement nose on each tooth 102, in the range of about 13.5 ° in contact.
• FIGS. 2 and 3 show a preferred embodiment of a parking brake 1 according to the invention, which is designed as a handbrake and which has a brake lever 2 shown only partially shown, which is hinged to a connected to the body lever holder 3 in a main axis 4 pivotally.
• the articulation in the main axis 4 is formed in the usual manner as a bearing for the brake lever.
• a toothing 5 is arranged on a circular segment with a constant radius about the main axis 4, in which the pitch is selected, for example, so that each tooth 1 ° pivot angle of the brake lever represents, so that the pitch of the teeth 1 tooth / angular degree. Between adjacent teeth 6 of the toothing 5 a recess 6 a is formed, which is provided approximately in the middle between the ridges 6 b of the teeth 6.
• the toothing 5 is formed integrally with the lever holder 3, but it is possible to provide a toothed segment for this purpose, which is fixed to the lever holder 3, for example caulked is.
• a pawl 7 is pivotally mounted about a pawl axis 8, wherein the bearing is designed as riveted pin, which passes through a corresponding hole 8a of the pawl and in which the rotational mobility is ensured by a arranged in the bore 8a bush made of Teflon.
• the pawl 7 essentially comprises two lever arms 7a and 7b, wherein the first lever arm 7a comprises an engagement nose 9 and an auxiliary nose 10, and the second lever 7b has an abutment for a guided in a handle push rod, so that the push rod, the second lever 7b can push backwards upon actuation of a corresponding release device, so that the engagement lug 9 is disengaged from the toothing 5.
• the brake lever must first be briefly raised.
• the pawl 7 is biased by a spring relative to the brake lever 2 in the direction of the toothing 5, so that when the release device is not actuated the pawl 7 is pressed under the bias of the spring in the direction of engagement on the toothing 5.
• auxiliary nose 10 which causes the pivoting of the engagement nose 9 not only takes place about the pawl axis 8, but at the same time pivoting about the auxiliary bearing point, as indicated by the arrow P.
• a game is used in the pawl link 8a, which prevents the pawl 7 blocks in the position corresponding to the auxiliary bearing point. The game allows a yielding of the pawl linkage 8a, so that the engagement lug 9 can always be engaged in the toothing 5 even when the auxiliary lug 10 is in contact.
• the engagement nose 9 is designed as a double-tooth engagement nose, wherein the actual engagement nose is formed by the upper engagement tooth 9a, while the second engagement tooth 9b essentially serves to engage behind the engagement tooth 9a supporting tooth 6 of the teeth 5. But it is also possible that the locking takes place primarily by the second engagement tooth 9b.
• the engagement nose 10 is narrower than the teeth 9a, 9b of the auxiliary nose 9 is formed so that the auxiliary nose 10 in full seat of the engagement nose 9 despite the non-integer distance, based on the pitch of the teeth 5, not jammed, but the narrower Auxiliary nose 10 is pressed a little way out of the recess 6b, without affecting the secure locking of the parking brake 1 by the locked in the toothing 5 engagement nose 9.
• the auxiliary nose 10 is disposed near the connection plane E, preferably not further than two tooth widths removed, and in particular the opening angle a of the connecting line between the
• Main axis 4 and auxiliary bearing point as small as possible or equal to three times the value of the tooth width, curious thus 3 °, is.
• the engagement nose 9 is pivoted in any case outside of a half-locking zone in the teeth 5 and thus achieves reliable and reproducible stable engagement position.
• the pawl 7 pivots about the auxiliary bearing point formed by the auxiliary nose 10.
• the preset non-integer spacing of the auxiliary nose 10 to the engagement nose 9 ensures that the engagement nose 9 in no case reaches a metastable contact position on the toothing 5, and thereby safely penetrates into a depression 6b.
• the beginning and end points of the zone Z which are shown in Fig. 1, are spaced apart by an angular range of about 13.5 °, this angle being expressed as a pivoting angle about the main axis 4.
• a distance between the engagement lug 9 and auxiliary nose 11, which adds to an integer measured in tooth widths distance still a fraction which is greater than said zone angle and of the integer multiple has a corresponding distance it is ensured that not simultaneously the auxiliary nose 10 and the engagement nose 9 can reach a metastable position.
• the fraction of a tooth width to be added to the integer pitch may be between 15 and 85% of the tooth width, wherein, for reasons of safety, a distance of at least 20% of a full tooth width should be maintained.
• the auxiliary nose 10 comes first in contact with the toothing 5 and forms by resting an auxiliary bearing point at its point of contact with the toothing 5, to which the engagement lug 9 in the direction of the toothing 5 below the bias of the pawl 7 acting spring is pivoted.
• the engagement lug 9 then comes into full engagement with the toothing 5, so that it is ensured that the touching of a metastable zone is prevented by the pivoting about the auxiliary bearing point.
• the engagement lug 9 then locks the parking brake. 1
• a release device is actuated, which presses a push rod against a facing surface of the lever arm 7b, and this pivots against the bias of the pawl 7 acting spring about the pawl axis 8.
• the brake lever 2 can then back to his stowed lowered position.
• the engagement lug 9 is deposited in a storage area immediately in front of the toothing 5, while the auxiliary lug 10 already projects into the toothing 5 by the amount of its distance from the engagement lug. Starting from this position, the parking brake 1 can be tightened again in the direction A.
• the engagement nose 9 comprises two teeth 9a, 9b. It is understood that the engagement nose can also be formed with only one tooth, or with more than two teeth.

Landscapes

• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Braking Elements And Transmission Devices (AREA)
• Braking Arrangements (AREA)

Priority Applications (5)

Applications Claiming Priority (4)

Publications (2)

Family

ID=41394926

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (11)

• 2008
  • 2008-11-11 DE DE102008056752A patent/DE102008056752B4/de not_active Expired - Fee Related
• 2009
  • 2009-09-29 EP EP09736822.9A patent/EP2342104B1/de not_active Not-in-force
  • 2009-09-29 US US13/121,225 patent/US8783131B2/en active Active
  • 2009-09-29 ES ES09736822.9T patent/ES2445574T3/es active Active
  • 2009-09-29 WO PCT/EP2009/007005 patent/WO2010034521A2/de not_active Ceased
  • 2009-09-29 CN CN200980143503.1A patent/CN102216132B/zh not_active Expired - Fee Related
  • 2009-09-29 JP JP2011528257A patent/JP2012504074A/ja active Pending

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