EP4196693A1 - Trommelbremse mit bremsschuhquerversatzausgleich - Google Patents
Trommelbremse mit bremsschuhquerversatzausgleichInfo
- Publication number
- EP4196693A1 EP4196693A1 EP21762605.0A EP21762605A EP4196693A1 EP 4196693 A1 EP4196693 A1 EP 4196693A1 EP 21762605 A EP21762605 A EP 21762605A EP 4196693 A1 EP4196693 A1 EP 4196693A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- drum
- motor vehicle
- brake system
- vehicle brake
- 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
- 230000007480 spreading Effects 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 13
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
- F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
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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
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
- F16D65/09—Pivots or supporting members therefor
-
- 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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/46—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action
- F16D51/48—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes
Definitions
- the invention relates to a drum brake that can be actuated, preferably electrically, in particular electrohydraulically or electromechanically, for a motor vehicle brake system, with actuators, such as a geared motor drive module including red-trans converter gear stage, transmission means and spreading device, or abutment support, which are in the power flow with movably mounted drum brake shoes. and are adapted and intended to cooperate with a brake drum.
- actuators such as a geared motor drive module including red-trans converter gear stage, transmission means and spreading device, or abutment support, which are in the power flow with movably mounted drum brake shoes. and are adapted and intended to cooperate with a brake drum.
- the applicant's DE 10 2018 215 979 A1 relates to a spreading device for spreading brake shoes of a drum brake for a motor vehicle, and a rotationally driven idle travel compensation device including a spring-loaded, rotatable adjustment screw is integrated into the spreading device.
- a compensation device for brake shoe transverse offset is provided adjacent to the expanding device and/or abutment in a brake drum interior, and this transverse offset compensation device is located laterally next to the spreading device and/or an abutment is inserted into the power flow of the drum brake.
- the feature “transverse” is always elucidated on the basis of the transverse axis Q, arranged orthogonally, at right angles in relation to the spreading axis S of the spreading device 2 .
- the advantageous transverse offset compensation device is particularly preferably inserted directly into the interface between the spreading device and the brake shoe in a form-fitting manner. If the customer accepts it or needs it, it can easily be retrofitted as an adaptive modification, retrofitting an indirect insertion of the compensating device by positive locking via at least one exchangeable adapter component that is additionally inserted into the power flow, without departing from the basic idea of the invention.
- the compensating device contains a special articulated or movable mounting in your mutual contact area using a controlled forced guidance.
- a web guide can be realized in a 2-dimensionally curved arc shape based on the model of a flexible disk/joint socket.
- the contact geometry also has at least one or more circular arc segments.
- the paired radii of the mutually paired circular arc segments for contact are each configured differently curved in the sense of mutual osculation.
- the radius placed on the actuating element side is dimensioned gradually smaller than the radius placed on the brake shoe side.
- the radius on the actuating element side can be dimensioned approximately in the order of magnitude of the brake drum diameter, whereas the counterpart with the radius on the brake shoe side can move approximately in the order of 1/5 - 1/10 of the brake drum diameter.
- the present invention is based on systematic, planned research into the interrelationships of the drum brake system in connection with the new finding that, in addition to idle travel compensation, further measures appear necessary and sensible in order to upgrade a drum brake for the modern age. Because the largely unavoidable, completely uneven drum brake shoe wear of a leading brake shoe and a trailing brake shoe in connection with the wear pattern of a brake drum that wears largely evenly concentrically causes a high degree of lateral offset for the power-transmitting bearing points over the service life of the system - in their relation to the adjacent, mostly immovable and /or components arranged fixed to the back plate (actuating element, spreading device, abutment).
- the offset compensation carried out includes a particularly geometrically profiled, tailor-made, universal joint socket-like bearing geometry in indirect or direct contact between the actuating element and the brake shoe, with the very pleasing effect that the compensation by means of friction lining bearing geometry, which has been further developed according to the invention, compensates for the wear path-related Avoiding or at least reducing migration movements on the support by means of a geometrically profiled support design.
- the wear offset compensation is compensated automatically, without current, automatically, and in particular the controllability as well as in particular the efficiency and power flow of a preferably electromechanically actuated drum brake is improved.
- the use of the invention is therefore basically suitable for all motor vehicle brake systems that have at least one drum brake.
- the wheel brakes such as the drum brake(s) in particular, can be designed to be controlled preferably electrically, in particular electrohydraulically and/or electromechanically, by means of an electronic control unit (ECU).
- ECU electronice control unit
- the present invention makes it possible for the currently preferred electrical brake-by-wire systems to reliably and reliably ensure simple, fast and sensitive electrical brake control in conjunction with simple electrical actuator control over the entire wear-prone brake shoe service life of a drum brake by mechanical design with the advantageous consequence that the invention is a perfect companion for the recuperative, flexible as needed, and networked dry brake system.
- the vehicle brake system does not necessarily have to have only drum brakes, but a mixed installation in connection with one or more types of brakes, such as in particular in connection with disc brakes, is possible and basically intended. It is advisable, but by no means mandatory, if the different types of brakes in the vehicle brake system are paired in the same way for each axle. Deviations from these principles are possible in special cases, which can affect brakes integrated in the drive train, for example.
- the invention is particularly suitable in combination with brake systems that contain drum brake load sensors, and where the drum brake load sensors are arranged adjacent to the compensating device within a brake drum, fixed to an anchor plate.
- Fig. 1 illustrates wear-related transverse offset / bearing contact point, wandering” as an example on a drum brake shoe (about half scale) with a gradually rounded support.
- the trailing brake shoe 7 is subject (relative to a preferred direction of rotation II) at its supports/contact points to a very large transverse offset Y1a/Y1b (comparatively around 7.9/7.5 mm, for example) over the service life of the friction lining under consideration.
- the transverse offset at the bearing contact point decreases by a factor of approximately 4 on the trailing brake shoe 7, i.e. the migration movement is reduced to, for example, something 1.77/1.91 mm - based on an initial design as in FIG.
- the person skilled in the art also recognizes the particularly advantageous design according to the invention, in that the center of the relevant lining shoe radius is offset from its starting point by only the amount Y1c/Y1d.
- a further development according to the invention is shown as an embodiment.
- the contact point is about Y1 a/Y1 b above this “Rk” axis.
- the contact point moves across the axis center from Rk to YTa/YTb, with the maximum degree of wear (cf. Fig. 4).
- the maximum distance (Y1 a/Y1 b/Y1'a and YTb) around the axis of Rk is approx. times smaller than shown in Fig. 2.
- Fig. 5 shows the support with a geometrically designed transverse offset compensation as an example using detail V as an example in Fig. 2.
- the invention relates very fundamentally to a drum brake 1 or an electronic brake system with one or more drum brakes 1 designed according to the invention for a motor vehicle.
- this can be an electrically open, assembled electrical service brake equipment as well as an electrically inhibited assembled one electric parking brake equipment and a combination using a combined parking and service brake equipment is also possible.
- the schematic drawing illustrates in principle a drum brake 1 which, for the sake of simplification, is of the special simplex type as an example and is shown as a simple service brake, and in which a parking brake device that is fundamentally additionally possible and is to be provided in a de-energized manner is not shown for the sake of simplification.
- a parking brake device that is fundamentally additionally possible and is to be provided in a de-energized manner is not shown for the sake of simplification.
- other types of brakes e.g. duo-servo, duplex, duo-duplex
- duo-servo duplex
- duo-duplex duo-duplex
- the drum brake 1 preferably has on a front side F a hydraulically and/or electromechanically actuable spreading device 2 with at least one, but preferably with two, actuating elements 15, 16 that can be displaced translationally in relation to the anchor plate 4 and an abutment 3, each of which is on a Front side F of the anchor plate 4 are fixed, and the anchor plate 4 with its anchor plate-fixed components and add-on parts, which may include, in particular, an electromechanical wheel brake actuator that can be actuated individually for each wheel on the back of the anchor plate, which is arranged as a wheel brake actuating device that is fixed to the vehicle and cannot be rotated on the anchor plate 4.
- an electromechanical wheel brake actuator that can be actuated individually for each wheel on the back of the anchor plate, which is arranged as a wheel brake actuating device that is fixed to the vehicle and cannot be rotated on the anchor plate 4.
- the brake shoes 7.8 are also movably mounted, which cooperate with a brake drum pot 6 of a wheel-fixed relative to the anchor plate 4, ie rotatably arranged, brake drum 5.
- Each brake shoe 7.8 has a largely rigid carrier for friction linings 9.10 which are gradually worn out and between the brake shoes 7.8 restoring springs 11, 12 can also be clamped elastically pretensioned in order to fundamentally impress a restoring force on the brake shoes 7.8 , respectively the brake shoes 7.8 - starting from an unworn and unactuated starting point "0" - to be held back in an unactuated end position.
- the present invention is based on the finding that the technical reasons for the always uneven wear of the friction lining in cooperation with the brake drum in conventional drum brakes lead to a geometric transverse offset in the area of support contacts 13, 13', 14, 14', with the result that a support contact point to a certain extent orthogonal, transverse to the expansion axis S of the actuating elements 15,16 of the spreading device 2 emigrates.
- the electromechanical geared motor drive of an electric drum brake is designed in such a way that each drum brake can be equipped with an individually assigned, electromechanical wheel brake actuator for the purpose of wheel-specific control, just as it is possible for several drum brakes to be equipped with a common electromechanical actuator via a cable pull.
- the drum brake 1 can have force sensors
- the invention is intended to reduce the above-mentioned deficiency.
- the force transmission of the covering should be as centric as possible. Due to the more centric force guidance, possible piston jamming (which leads to increased residual torque) and increased friction are prevented or reduced in existing hydraulic brake drum cylinders. This leads to a higher efficiency of the spreading unit.
- This preferential introduction of force from the pads into the spreader unit helps in particular with electromechanical spreader units (e.g. KGT or ball ramp systems).
- electromechanical spreader units e.g. KGT or ball ramp systems.
- the transverse forces can be absorbed by shorter guide lengths. Consequently, this leads to smaller dimensions of the electromechanical. spreading units.
- Another The advantage is the improved value acquisition of appropriately designed path/force measuring units at force transfer points, as they are preferably used in "dry" brake systems for braking torque monitoring. Lateral forces lead here, for example, to lateral deflection which falsifies the measured value.
- the lining migration is greatly reduced by a "shell - disc design” (see also Figure 3).
- the design is to be selected in such a way that the lateral forces that cannot be avoided are kept as small as possible and supported favorably.
- the lining wander from the center of the axle can be further reduced by moving the "starting point” of the contact surface over the center of the axle. As a result, the point of force contact moves across the center of the axle to the end point when there is wear (fully worn pads).
- the expression of the design can also be introduced as a mirror image on the contact surfaces.
- the invention makes it possible to reduce the transverse forces and allow the force contact point on drum brake linings to move. This reduction reduces the transverse forces in the components involved, which means that they no longer have to be designed to be as robust with regard to these forces.
- the invention can improve applications for all drum brake systems in which drum brakes are present (simplex, duplex, duo duplex, . . . ).
- a maximum small radius should be selected for Rk, and a maximum large one for Rg (up to the straight line). Due to the fact that Rg moves, care must be taken with Rg that the smallest possible angle 1a 1b 1'a° and 1'b° is created in the main area of use (see Figure 3a/b) if you want to reduce the transverse forces as much as possible. This is possible with an offset, for example, as shown.
- the smallest radius is limited by the material properties.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Braking Systems And Boosters (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020210134.5A DE102020210134A1 (de) | 2020-08-11 | 2020-08-11 | Trommelbremse mit Bremsschuhquerversatzausgleich |
PCT/DE2021/200103 WO2022033642A1 (de) | 2020-08-11 | 2021-08-05 | Trommelbremse mit bremsschuhquerversatzausgleich |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4196693A1 true EP4196693A1 (de) | 2023-06-21 |
Family
ID=77543275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21762605.0A Pending EP4196693A1 (de) | 2020-08-11 | 2021-08-05 | Trommelbremse mit bremsschuhquerversatzausgleich |
Country Status (8)
Country | Link |
---|---|
US (1) | US20230296147A1 (de) |
EP (1) | EP4196693A1 (de) |
JP (1) | JP2023532585A (de) |
KR (1) | KR20230022997A (de) |
CN (1) | CN116018470A (de) |
BR (1) | BR112022025419A2 (de) |
DE (1) | DE102020210134A1 (de) |
WO (1) | WO2022033642A1 (de) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR775896A (fr) | 1933-10-04 | 1935-01-11 | Dispositif d'articulation pour mâchoires de frein pour voitures automobiles ou autres applications | |
JPS5316169A (en) * | 1976-07-28 | 1978-02-14 | Toyota Motor Corp | Floating-shoe type drum brake |
GB9222302D0 (en) | 1992-10-22 | 1992-12-09 | Lucas Ind Plc | Internal shoe drum brake |
DE9419265U1 (de) | 1994-12-01 | 1995-01-26 | Knott GmbH, 83125 Eggstätt | Bremsbacke, insbesondere Trommelbremsbacke |
DE102016221189B4 (de) | 2015-10-30 | 2020-01-09 | Continental Teves Ag & Co. Ohg | Radbremsaktuatormodul für eine elektrisch kombiniert betätigbare Kraftfahrzeugbremse |
DE102018215979A1 (de) | 2018-09-19 | 2020-03-19 | Continental Teves Ag & Co. Ohg | Spreizeinrichtung für Trommelbremse mit Kompensationseinrichtung und die Trommelbremse |
-
2020
- 2020-08-11 DE DE102020210134.5A patent/DE102020210134A1/de active Pending
-
2021
- 2021-08-05 BR BR112022025419A patent/BR112022025419A2/pt unknown
- 2021-08-05 WO PCT/DE2021/200103 patent/WO2022033642A1/de unknown
- 2021-08-05 KR KR1020237000980A patent/KR20230022997A/ko unknown
- 2021-08-05 US US18/041,446 patent/US20230296147A1/en active Pending
- 2021-08-05 EP EP21762605.0A patent/EP4196693A1/de active Pending
- 2021-08-05 CN CN202180048065.1A patent/CN116018470A/zh active Pending
- 2021-08-05 JP JP2023500354A patent/JP2023532585A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
CN116018470A (zh) | 2023-04-25 |
DE102020210134A1 (de) | 2022-02-17 |
JP2023532585A (ja) | 2023-07-28 |
BR112022025419A2 (pt) | 2023-03-14 |
US20230296147A1 (en) | 2023-09-21 |
KR20230022997A (ko) | 2023-02-16 |
WO2022033642A1 (de) | 2022-02-17 |
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Owner name: CONTINENTAL AUTOMOTIVE TECHNOLOGIES GMBH |