WO2005021368A1 - Sensor carrier - Google Patents

Sensor carrier Download PDF

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Publication number
WO2005021368A1
WO2005021368A1 PCT/EP2004/009577 EP2004009577W WO2005021368A1 WO 2005021368 A1 WO2005021368 A1 WO 2005021368A1 EP 2004009577 W EP2004009577 W EP 2004009577W WO 2005021368 A1 WO2005021368 A1 WO 2005021368A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
bending
elevation
sensor carrier
carrier
Prior art date
Application number
PCT/EP2004/009577
Other languages
German (de)
French (fr)
Inventor
Martin FRÄNKEL
David Clus
Volker Fiederle
Original Assignee
Feo Elektronic Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE10339304.8 priority Critical
Priority to DE2003139304 priority patent/DE10339304A1/en
Application filed by Feo Elektronic Gmbh filed Critical Feo Elektronic Gmbh
Publication of WO2005021368A1 publication Critical patent/WO2005021368A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40Rider propelled cycles with auxiliary electric motor
    • B62M6/45Control or actuating devices therefor
    • B62M6/50Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M23/00Transmissions characterised by use of other elements; Other transmissions
    • B62M23/02Transmissions characterised by use of other elements; Other transmissions characterised by the use of two or more dissimilar sources of power, e.g. transmissions for hybrid motorcycles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00Construction of cranks operated by hand or foot
    • B62M3/003Combination of crank axles and bearings housed in the bottom bracket

Abstract

The invention relates to a sensor carrier (16, 64, 128) for transmitting a bottom bracket shaft (6) force to a sensor (18, 20, 22, 24, 26, 28, 30, 32, 98, 100) comprising a radially internal part (34, 66, 130) and radially external part (44, 74, 132). According to said invention one of said parts (34, 44, 66, 74, 130, 132) is provided with an elevation (46, 48, 50, 52, 76, 78, 134) for deforming the other part (34, 44, 66, 74, 130, 132), thereby making it possible to obtain an accurate low-cost and small sensor (18, 20, 22, 24, 26, 28, 30, 32, 98, 100) for determining a force reacting, for example to a length modification.

Description


   <Desc / Clms Page number 1>
 



  State of the art The invention is based on a sensor carrier according to the preamble of claim 1.



  A torque sensor is known from EP 0 983 934 B1, with which a torque applied to a bottom bracket shaft, in particular to a bottom bracket shaft in a bicycle bottom bracket for motor-assisted bicycles, can be determined.



  The torque sensor comprises a pressure sensor element which is arranged on a sensor carrier and is non-positively attached between the bottom bracket shaft and a section of a bicycle frame enclosing the bottom bracket shaft. The pressure sensor element registers a value of a force on the bottom bracket shaft, which may be proportional to a torque on the bottom bracket shaft.



  The invention has for its object to develop a sensor carrier that transmits a force applied to the bottom bracket shaft in a bicycle bottom bracket to a sensor element in such a way that a precise and inexpensive sensor element is used to determine a force

 <Desc / Clms Page number 2>

 can. According to the invention, it is solved by the features of claim 1. Further refinements result from the subclaims.



  The invention is based in particular on a sensor carrier for transmitting a force from a bottom bracket shaft to a sensor element which comprises a radially inner part and a radially outer part.



  It is proposed that an elevation for deforming the other part is arranged on one of the parts. As a result, a precise, inexpensive and compact sensor element can be used to determine a force, which reacts, for example, to a change in length. The deformation is caused by a force transmission from the elevation to the other part. If there is a known causal relationship between a deformation and a force on the bottom bracket shaft that causes the deformation, this force can be determined from a direct or indirect measurement of the deformation. A length measurement can be carried out as an indirect measurement, for example with the aid of a strain gauge.



  However, other measurement methods for determining the deformation are equally conceivable.



  An elevation is understood to mean, in particular, an element protruding from the surface of the part, which clearly stands out from the surrounding surface of the part and can thus be located on the part. The survey can be a

 <Desc / Clms Page number 3>

 be integrally formed with the part of the part or an element arranged on the part, for example a cylinder, which can be positively or materially connected to the part.



  In an advantageous embodiment of the invention, the two parts are non-rotatably connected to one another in the tangential direction, in particular the two parts are non-rotatably connected to one another by the elevation. Due to the torsional strength, a force that is transmitted via the elevation is always directed to the same location, which is why the deformation always occurs at the same location. Therefore, in the case of a fixedly arranged sensor element, which reacts in particular to a change in length caused by the deformation, there is no falsification of an output signal of the sensor element due to a relative rotation of the parts to one another. In addition, the torsional strength increases wear resistance.

   The torsional strength is also considered to be given if the two parts twist against each other due to an elastic deformation of the elevation.



  The two parts and the elevation are advantageously connected to one another in one piece. This simplifies assembly and can make any pre-assembly of the sensor carrier unnecessary. Furthermore, the two parts in this production form are free of play with respect to one another, as a result of which a force transmission through the elevation always takes place at the same location, which can reduce falsification of an output signal from the sensor element. The parts and the elevation can be made in one piece in their entirety, whereby precise dimensions of the sensor carrier are achieved

 <Desc / Clms Page number 4>

 can. It is also possible to manufacture the parts separately and to join them together.

   In this form of production, the individual pieces can be processed independently of one another at a time in a production process, which means that simpler production and hardening processes can be used with advantages in production costs.



  In an alternative embodiment, the two parts are manufactured separately and joined together in a form-fitting manner. In a separate production, each of the two parts can consist of a single piece. The elevations can be molded onto one of the two parts or can be separate elements. It is also conceivable that the parts themselves consist of coherent individual pieces.



  The sensor carrier expediently comprises a plurality of elevations, the two parts being connected to one another only by the elevations. A falsification of a measurement result by a further connecting element can be counteracted.



  In a particularly preferred embodiment, the elevation is designed as a web aligned in the axial direction. A narrow, in particular linear, power transmission can be achieved. A particularly uniform, narrow or linear transmission of force can be achieved if the elevation is cylindrical. In addition, a cylindrical elevation that is separate from the two parts is particularly robust and inexpensive to manufacture. In the case of a narrow and high web, a falsification of an output signal of a sensor element by a on the web

 <Desc / Clms Page number 5>

 acting tangential force can be kept low. A web aligned in the axial direction has a height in the radial direction, a length in the axial direction and a width in the tangential direction, which is relatively small in relation to the length.



  Preferably, several elevations for the deformation of the other part are arranged offset in the tangential direction to the bottom bracket shaft. In this way, several force components of the force acting on the bottom bracket shaft acting in different directions can be determined separately or at least largely separately from one another. In particular, a force composition of the force acting on the bottom bracket shaft can be derived from this.



  In a particularly advantageous embodiment of the invention, at least one slot-like recess which is continuous in the axial direction is arranged between the two parts between the elevations. It can thereby be achieved that the force applied to the bottom bracket shaft is transmitted from one part to the other part only via the elevations, which has a favorable effect on the strength of the deformation. This embodiment can be designed such that, apart from the elevations, no further force transmission elements are arranged between the two parts. The slot-like recesses can extend completely through the sensor carrier in the axial direction.



  A recess which is circular except for at least one flat flattening around an elevation is particularly simple to manufacture. The recess in particular separates the two parts from one another in the region of the recess.

 <Desc / Clms Page number 6>

 



  It is particularly expedient if the elevation is designed to be elastically deformed when subjected to a force in the tangential direction. An undesired transmission of a force in the tangential direction to the part to be deformed can thereby be reduced by the elevation.



  A web with a smaller width in relation to the height in the tangential direction is particularly advantageous. A tangential force acting on the web in the tangential direction can relatively easily lead to a deformation of the web. This tangential force is only partially, preferably to a small extent, transmitted through the web on which it acts tangentially to the part to be deformed, and at another point where it acts as a radial force, it is transmitted to the part to be deformed , Falsification of an output signal of a sensor element by strong tangential force transmission via the web can be kept to a minimum.



  An axial direction is understood to mean a direction parallel to the shaft axis.



  In a further embodiment of the invention, the radially inner part is made thinner radially inside the elevation than in the surroundings. A resistance to deformation due to the radially inner part can be kept low.



  Advantageously, one of the parts comprises a bending element which is provided for elastic deformation when the force is transmitted through the elevation. Thus, on the one hand, the resistance to breakage of the part in the region of the deformation can be increased and, on the other hand, a strength of the deformation can be increased. The bending element can be used in different ways for the

 <Desc / Clms Page number 7>

 Deformation may be provided. In particular, it can be made thinner in the radial direction, or the material composition can be of a more elastic nature than that of another region of the part.



  The bending element in the area around the elevation is expediently designed to be flat and in particular with a uniform radial thickness. A simple evaluation of the measurement signal can be achieved because a deformation force and a deformation are in a relatively simple relationship to one another.



  In a particularly advantageous embodiment of the invention, the part comprising the bending element is in contact with a fixing element for fixing the part in an axial position, and a recess is formed between the part and the fixing element in such a way that the bending element and in particular also the elevation are held contact-free to the fixing element. Due to the absence of contact, the bending element and the elevation can move through the fixation element without disturbing friction. As a result, a force transmission of the elevation is not reduced by this friction, nor is the deformation caused by the force transmission. Furthermore, the absence of contact or the lack of friction bypasses this by hysteresis, which means that there is no falsification of an output signal from a sensor element.

   A further advantage of this embodiment is that the recess does not contribute to a deformation of the bending element due to the axial force that is applied in addition to a force for fixing the part, and thus also prevents the output signal of a sensor element from being falsified.

 <Desc / Clms Page number 8>

 



  The bending element preferably comprises a first sensor receiving point for arranging a sensor element. A first sensor element can be attached to the first sensor receiving point, whereby a force on the bending element can be determined by measuring the deformation of the bending element at the sensor receiving point.



  The first sensor receiving point is advantageously arranged at a point on the bending element at which the deformation of the bending element is greatest when the force is transmitted through the elevation. As a result, an output signal from the sensor element there can also be strongest, which has advantages, for example in an evaluation and / or display of the output signal.



  It is of additional advantage if the bending element comprises a second sensor receiving point for the arrangement of a second sensor element. The second sensor element provides a second output signal, which can be used in a variety of ways, particularly in an evaluation and / or display.



  In a particularly suitable embodiment, one sensor element is arranged at each of the sensor receiving points, and the sensor elements are connected to one another. By skillfully connecting the sensor elements, an overall output signal can be formed, which is advantageous in an evaluation and / or display. An addition or subtraction of the signals is particularly conceivable.

 <Desc / Clms Page number 9>

 



  The sensor elements are preferably interconnected in such a way that an overall output signal that is stronger than an output signal of an individual sensor element can be tapped when the bending element is deformed. A strong overall output signal can achieve a higher resolution in an evaluation and / or display.



  The first and the second sensor receiving points are particularly advantageously arranged at points on the bending element at which the deformation of the bending element stimulates the sensors arranged there relative to one another in opposite reactions. This results in possibilities, particularly in the case of electrical signals and interconnections, through which a particularly strong overall output signal can be tapped.



  The first and the second sensor receiving point are advantageously arranged symmetrically to a plane running through the elevation and oriented in the axial direction and in the radial direction. The symmetrical arrangement of, in particular, identical sensor elements enables conclusions to be drawn particularly easily, for example with regard to a force profile, since the measurements are carried out by the sensor elements at the same distance from a plane of symmetry.



  The radially outer part advantageously comprises a sensor receiving point on an outside lying in the radial direction for arranging the sensor element. This facilitates accessibility, which in particular makes assembly and maintenance easy.

 <Desc / Clms Page number 10>

 



  Drawing Further advantages result from the following description of the drawing. Exemplary embodiments of the invention are shown in the drawing. The drawings, description, and claims contain numerous features in combination.



  The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations. Corresponding parts are provided with the same reference symbols in the figures.



  Show it :
1 is a schematically illustrated bicycle,
2 shows a section through a bicycle pedal bracket,
Fig. 3 shows a section through part of the
Bicycle treadmill from Fig. 2 according to the
Level III-III,
Fig. 4 shows a section through part of the
Bicycle treadmill from Fig. 2 according to the
Level IV-IV,
5 shows a side view of a sensor carrier,
6 shows a section through the sensor carrier from FIG. 5 according to the plane VI-VI,
7 shows a side view of the sensor carrier from FIG. 5 according to direction VII with an arranged strain gauge,

 <Desc / Clms Page number 11>

 
8 shows a schematically represented deformation of a bending element with sensor elements,
9 shows a partial section of a bicycle pedal bracket with an arranged sensor carrier according to FIG. 5,
Fig. 10 is a side view of another
Sensor support,
FIG.

   11 is a perspective view of FIG
10,
12 shows an electrical circuit diagram of an arrangement with a sensor element,
13 shows an electrical circuit diagram of an arrangement with two sensor elements and
14 shows a further electrical circuit diagram of an arrangement with two sensor elements.



  DESCRIPTION OF THE EXEMPLARY EMBODIMENTS FIG. 1 shows a schematically illustrated bicycle 2, which comprises a bicycle frame 4, a bottom bracket shaft 6 of a bicycle bottom bracket 10 and pedal cranks 8 attached to the bottom bracket shaft 6.



  FIG. 2 shows a section through a bicycle bottom bracket 10 perpendicular to the shaft axis of the bottom bracket shaft 6. The following are shown from the inside out: the bottom bracket shaft 6, a needle bearing 12, a bearing shell 14, a sensor carrier 16, a plurality of sensor elements 18, 20, 22, 24, 26, 28, 30, 32 and the like

 <Desc / Clms Page number 12>

 the bottom bracket shaft 6 comprising part of the bicycle frame 4th



  The sensor carrier 16 comprises a radially inner part 34, four slot-like recesses 36, 38, 40, 42, a radially outer part 44, four elevations 46, 48, 50, 52, which are designed as webs aligned in the axial direction, and four bending elements 54 , 56, 58.60. In addition, a recess 62 is shown, which together with a pin, not shown, serves to secure the outer part 44 against the bicycle frame 4.



  For illustration, a section of part of the bicycle pedal bearing 10 according to a sectional plane III-III is shown in FIG. 3, in which the arrangement of the needle bearing 12 is shown schematically. The one-piece production of the sensor carrier 16 is also clearly visible in this section. FIG. 4 shows a further section of the part of the bicycle pedal bearing 10 according to a section plane IV-IV. This figure illustrates that the radially inner part 34 is separated from the radially outer part by the slot-like recesses 36, 38, 40, 42.



  A side view of an alternative embodiment of a sensor carrier 64 is shown in FIG. 5. It comprises a radially inner part 66, three slot-like recesses 68, 70, 72 and a radially outer part 74. Furthermore, two elevations 76, 78 designed as webs and two bending elements 80, 82 can be seen. In addition, a recess 84 is shown, which, together with a pin (not shown), serves to secure the outer part 74 against rotation with respect to the bicycle frame 4, and a connecting element 86, which has been arranged for reasons of stability. Three recesses 88.90, 92

 <Desc / Clms Page number 13>

 are production-related and have no function. A line L is explained in FIG. 9 and the exemplary embodiments.



  FIG. 6 shows a section through the sensor carrier 64 according to a section plane VI-VI. The bending element 80 is shown, which is flanked by two recesses 94, 96.



  FIG. 7 shows a side view of the sensor carrier 64 in the direction VII, on which a strain gauge 102 with two arranged sensor elements 98, 100 is attached. Two recesses 104, 106 are arranged on the side of the bending element 82.



  FIG. 8 shows a detailed side view of the bending element 82 in the deformed state in the direction VIII in a schematic illustration. The elevation 78 deforms the bending element 82, on which two sensor elements 98, 100 are arranged on the sensor deformation points 108, 110 assigned to them at the points of greatest deformation.



  A part of a bicycle bottom bracket 112 is shown in FIG. 9 in a partial section. This bicycle pedal bearing 112 comprises a bottom bracket shaft 6, a bearing 116 and the sensor carrier 64 according to FIG. 6. The sensor carrier 64 is held in its axial position outside the line L by two fixing elements 120, 122 via the radially outer part 74 (FIG. 5). Here, the fixing element 120 is supported on a bottom bracket shaft 6 via an axial ball bearing 124, while the fixing element 122 is supported on a limiting element 126, which axially positions the fixing element 122 via a thread (not shown in more detail). Recesses 104 and 106 through which the radially outer one can be seen can also be seen

 <Desc / Clms Page number 14>

 Part 74 in the area of the bending element 80 and the elevation 76 are held contact-free with the fixing elements 120, 122.

   The sensor element 98 is also indicated.



  Another possible embodiment is shown in FIGS. 10 and 11. A sensor carrier 128 comprises a radially inner part 130 and a radially outer part 132, which are separately and displaceable to one another in the axial direction and are positively connected to one another in the tangential direction by four elevations 134 designed as separate cylinders. Arranged between the parts 130, 132 is an all-round circular slot 136, which is flat in the area around the elevations 134. The web-like cylindrical elevations 134 made of stainless steel can be pushed in the axial direction between the parts 130, 132 and are each secured against tangential movement by a cylindrical groove in each of the two parts 130, 132.



  When the sensor carrier 128 is in operation, the elevations 134 press two flat bending elements 138 outwards, on each of which two sensor elements 140 are arranged. The bending elements 138 are of uniform thickness in the region of the elevations 134 and are delimited on one side in each case by a recess 142 aligned parallel to the bending elements 138, which counteract undesired friction with the fixing elements 120, 122 (FIG. 9).



  In Figure 12, an electrical bridge circuit is shown, which is formed from two fixed resistors Round two variable resistors R1 and R2. The variable resistors R1 and R2 represent two sensor elements, in particular two strain gauges, which are in the unstretched condition.

 <Desc / Clms Page number 15>

 also have the same resistance as the fixed resistance Ro and change their resistance when stretched or compressed. If a potential is applied to the bridge circuit, a total output signal V1 is zero in the unstretched state of the strain gauge.

   In the event of elongation or compression due to the change in resistance of the strain gauge, however, the total output signal V1 assumes a value not equal to zero, in a favorable case proportional to the elongation or compression. This electrical bridge circuit is preferably used when the resistances of the sensor elements are increased or decreased during expansion or compression. This is the case, for example, in the exemplary embodiment in FIG. 2.



  Figure 13 shows an electrical bridge circuit, which is also formed from two fixed resistors Ro and two variable resistors Ri and Ra. With regard to a higher total output signal V1, however, this electrical bridge circuit is used with advantage if the resistance R1 increases and the resistance R2 decreases or the resistance R2 increases and the resistance R1 increases and the resistance R1 decreases. The sensor elements in FIG. 8 can advantageously be interconnected such that the sensor element 98 is stretched when the bending element 82 is deformed, whereas the sensor element 100 is compressed.



  If the sensor elements 98, 100 are of the same type, the electrical resistance of one and the other decreases.



  FIG. 14 shows an electrical bridge circuit that can be used if only one sensor element is used

 <Desc / Clms Page number 16>

 a variable resistance Ri is arranged on a bending element.



  The mode of operation of the sensor carriers 16, 64 will now be described in detail using preferred exemplary embodiments.



  In a first exemplary embodiment, which is shown in FIG. 2, a force is applied to the bottom bracket shaft 6 via the pedal cranks 8 and at least largely passed on to the sensor carrier 16 via the needle bearing 12 and the bearing shell 14. The force flow in the sensor carrier 16 runs from the radially inner part 34 via the elevations 46, 48, 50, 52 aligned in the axial direction to the radially outer part 44. The radially outer part 44 is at the points of the force flow via the elevations 46, 48 , 50, 52 in the form of the bending elements 54, 56, 58, 60. The bending elements 54, 56, 58, 60 are prepared for deformation and deform when the force is transmitted through the elevations 46, 48, 50, 52.

   In order to limit the flow of force for the purpose of strong deformation of the bending elements 54, 56, 58, 60 to the elevations 46, 48, 50, 52, the recesses 36, 38, 40, 42 are formed between them, which are continuous in the axial direction. This arrangement provides a large proportion of the force on the bottom bracket shaft 6, known from experiments, for example, for deforming the bending elements 54, 56, 58, 60. So that the bending elements 54, 56, 58, 60 are always deformed at the same point, the inner part 34 and the outer part 44 are connected to one another in a rotationally fixed manner by being made from one piece. The inner part 34 and the outer part 44 form together with the

 <Desc / Clms Page number 17>

 Elevations 46, 48, 50, 52 thus form the one-piece sensor carrier 16.



  In particular, due to a relatively narrow design of the elevations 46, 48, 50, 52 in the tangential direction, they can deform elastically relatively easily in the tangential direction. In this way, for example, a force F, which acts on the elevations 46, 50 in the tangential direction, is only transmitted to a small extent through the elevations 46, 50 and largely through the elevations 48, 52 due to the elastic deformation.



  For the most part, radial forces are transmitted via the elevations 46, 48, 50, 52. The force causing the deformation can be derived from the deformation of the bending elements 54, 56, 58, 60 by means of the sensor elements 18, 20, 22, 24, 26, 28, 30, 32. Since the elevations 46, 48, 50, 52 are arranged offset by 90 in each case in the tangential direction, force components are transmitted which act either perpendicularly or counter to one another, as a result of which the force on the bottom bracket shaft 6 can easily be determined in vectorially independent components.

   Radially outside on the bending elements 54, 56, 58, 60, the sensor elements 18, 20, 22, 24, 26, 28, 30, 32 are each arranged in pairs on a bending element 54, 56, 58, 60 in order to achieve a higher overall output signal To obtain Vu than is possible in an arrangement with only one sensor element (18.20, 22.24, 26.28, 30.32). In this exemplary embodiment, two of the sensor elements 18, 20, 22, 24, 26, 28, 30, 32 are each arranged symmetrically to a plane III-III or SS, as a result of which a deformation, for example of the bending element 54, both sensor elements 28, 30 compress or expand. As a result, they change when strain gauges are used as sensor elements

 <Desc / Clms Page number 18>

 18, 20, 22, 24, 26, 28, 30, 32 their electrical resistance is the same, which is why a connection according to FIG. 12 is preferably used.



  In a second exemplary embodiment of the sensor carrier 64 according to FIG. 5, only two elevations 76, 78 are formed, which are arranged offset from one another in the tangential direction by 90. This is sufficient to determine two mutually perpendicular and therefore independent components of the force on the bottom bracket shaft 6. The elevations 76, 78 transmit a large part of the force applied to the bottom bracket shaft 6 via a bearing 116 (FIG. 9) from the radially inner part 66 to the radially outer part 74 or to the bending elements 80, 82 formed there.



  When a force is transmitted from the force to the bottom bracket shaft 6, the radially inner part 66 must be able to move relative to the radially outer part 74 so that the bending elements 80, 82 can be deformed by the elevations 76, 78. In order to ensure the relative mobility of the inner part 66, the sensor carrier 64 is positioned axially only via the radially outer part 74 outside the line L by the fixing elements 120, 122. However, so that the mobility of the bending elements 80, 82 and the elevations 76, 78 is not impeded by the fixing elements 120, 122, the radially outer part 74 in the region of the bending elements 80, 82 has the recesses 94, 96, 104, 106, so that the bending elements 80, 82 and the elevations 76, 78 are held contact-free with the fixing elements 120, 122.

   The radially outer part 74 comes outside the bending elements and elevations

 <Desc / Clms Page number 19>

 with the fixing elements 120, 122 in contact, so that the sensor carrier 64 is positioned axially.



  In this exemplary embodiment, too, two sensor elements 98, 100 are used on the bending elements 80, 82 at the sensor receiving points 108, 110 assigned to them, only two of the four sensor elements 98, 100 being shown in FIG. 7. The arrangement of the sensor elements 98, 100 is shown in FIG. 7. They are deformed during a power transmission, as shown in Figure 8. During this deformation, the sensor element 98 is stretched, whereas the sensor element 100 is compressed. It is also conceivable to mount the sensor element 98 and the sensor element 100 on the same side of the bending element 82, either to the right or to the left of the elevation 78. This deformation increases the resistance R1 of the sensor element 98 and the resistance R2 of the sensor element 100 decreases.

   An electrical connection according to FIG. 13 is therefore advantageously carried out here.



  If only one sensor element per bending element is used, a circuit according to FIG. 14 can be used.

 <Desc / Clms Page number 20>

 



  Reference number 2 bicycle 4 bicycle frame 6 bottom bracket shaft 8 pedal crank 10 bicycle bottom bracket 12 needle bearing 14 bearing shell 16 sensor carrier 18, 20, 22 sensor element 24, 26, 28 sensor element 30, 32 sensor element 34 part 36, 38, 40 recess 42 recess 44 part 46, 48, 50 Elevation 52 elevation 54.56, 58 bending element 60 bending element 62 recess 64 sensor carrier 66 part 68.70, 72 recess 74 part 76.78 elevation 80.82 bending element 84 recess 86 connecting element 88, 90.92 recess 94.96 recess 98.100 sensor element 102 Strain gauge 104,106 recess 108,110 sensor mounting point 112 bicycle pedal bearing 116 bearing 120,122 fixing element 124 axial ball bearing 126 limiting element 128 sensor carrier 130,132 part 134 elevation 136 slot 138 bending element 140 sensor element 142 recess Ro fixed resistance Rl,

   R2 resistor V1 total output signal F force L line

Claims

Claims 1. Sensor carrier (16, 64, 128) for transmitting a force from a bottom bracket shaft (6) to a sensor element (18, 20, 22, 24, 26, 28, 30, 32, 98, 100, 140) which has a radially inner one Part (34,66, 130) and a radially outer part (44,74, 132), characterized in that on one of the parts (34,44, 66,74, 130,132) an elevation (46,48, 50,52 , 76, 78, 134) for deforming the other part (34, 44, 66, 74, 130, 132).
2. Sensor carrier (16, 64, 128) according to claim 1, characterized in that the two parts (34, 44, 66, 74, 130, 132) are connected to one another in a rotationally fixed manner, in particular by the elevation (46, 48, 50, 52) , 76.78, 134).
3. Sensor carrier (16, 64, 128) according to claim 1 or 2, characterized by a plurality of elevations (46, 48, 50, 52, 76, 78, 134), the two parts (34, 44, 66, 74, 130, 132 ) are only connected to one another by the elevations (46, 48, 50, 52, 76, 78, 134).
4. Sensor carrier (16, 64, 128) according to one of the preceding claims, that the elevation (46, 48, 50, 52, 76, 78, 134) is a web aligned in the axial direction and in particular cylindrical.  <Desc / Clms Page number 22>  
  5. Sensor carrier (16, 64, 128) according to one of the preceding claims, characterized in that several elevations (46, 48, 50, 52, 76, 78, 134) for deforming the other part (34, 44, 66, 74, 130, 132) are arranged offset in the tangential direction to the bottom bracket shaft (6).
6. Sensor carrier (16, 64, 128) according to claim 5, characterized in that between the elevations (46, 48, 50, 52, 76, 78, 134) at least one slit-like recess (36, 38, 40) that is continuous in the axial direction. 42, 68, 70, 72) is arranged between the two parts (34, 44, 66, 74, 130, 132).
7. Sensor carrier (16, 64, 128) according to claim 6, so that the recess is circular in shape except for at least one flat flattening around an elevation.
8. The sensor carrier (16, 64) according to one of the preceding claims, that the elevation (46, 48, 50, 52, 76, 78, 134) is designed to be elastically deformed when stressed by a force in the tangential direction.
9. Sensor carrier (16, 64, 128) according to one of the preceding claims, characterized in that the radially inner part (34, 66, 130) radially thinner within the elevation (46, 48, 50, 52, 76, 78, 134) is than in the area.  <Desc / Clms Page number 23>  
10. Sensor carrier (16, 64, 128) according to one of the preceding claims, characterized in that one of the parts (44, 74, 130) comprises a bending element (54, 56, 58, 60, 80, 82, 138) that is an elastic deformation in a power transmission through the elevation (46.48, 50.52, 76.78, 134) is provided.
11. Sensor carrier (16, 64, 128) according to claim 10, characterized in that the bending element (54, 56, 58, 60, 80, 82, 138) in the area around the elevation (46, 48, 50, 52, 76, 78, 134) is flat and in particular with a uniform radial thickness.
12. Sensor carrier (16, 64, 128) according to claim 10 or 11, characterized in that the part (34, 44, 66, 74, 130, 132) which comprises the bending element (54, 56, 58, 60, 80, 82, 138) , with a fixing element (120, 122) for fixing the part (34,44, 66,74, 130,132) in an axial position and that between the part (34,44, 66,74, 130,132) and the fixing element (120, 122) a recess (94, 96, 104, 106, 142) is designed in such a way that the bending element (54, 56, 58, 60, 80, 82, 138) and in particular also the elevation (46, 48, 50, 52, 76, 78, 134) are held contact-free with the fixing element (120, 122).  <Desc / Clms Page number 24>  
13. Sensor carrier (16, 64, 128) according to one of claims 10 to 12, characterized in that the bending element (54, 56, 58, 60, 80, 82, 138) has a first sensor receiving point (108, 110) for arranging a sensor element (18 , 20, 22.24, 26.28, 30.32, 98.100).
14. Sensor carrier (16, 64, 128) according to claim 13, characterized in that the first sensor receiving point (108, 110) is arranged at a point on the bending element (54, 56, 58, 60, 80, 82, 138) at which the deformation of the bending element (54.56, 58.60, 80.82, 138) is strongest when transmitting force through the elevation (46.48, 50.52, 76.78, 134).
15. Sensor carrier (16, 64, 128) according to claim 13 or 14, characterized in that the bending element (54, 56, 58, 60, 80, 82, 138) has a second sensor receiving point (108, 110) for arranging a second sensor element (18, 20, 22, 24, 26, 28, 30, 32, 98, 100, 140).
16. Sensor carrier (16, 64, 128) according to claim 15, characterized in that a sensor element (18, 20, 22, 24, 26, 28, 30, 32, 98, 100, 140) is arranged at each of the sensor receiving points (108, 110) and the sensor elements (18, 20, 22, 24, 26, 28, 30, 32, 98, 100, 140) are interconnected.  <Desc / Clms Page number 25>  
17. Sensor carrier (16, 64, 128) according to claim 15 or 16, characterized in that the sensor elements (18, 20, 22, 24, 26, 28, 30, 32, 98, 100, 140) are interconnected in a manner that when the bending element (54, 56, 58, 60, 80, 82, 138) is deformed, a total output signal (V1) can be tapped that is stronger than an output signal of an individual sensor element (18, 20, 22, 24, 26) , 28.30, 32.98, 100.140).
18. Sensor carrier (16, 64, 128) according to one of claims 15 to 17, characterized in that the first and the second sensor receiving point (108, 110) are arranged at points of the bending element (54, 56, 58, 60, 80, 82, 138) on which the deformation of the bending element (54, 56, 58, 60, 80, 82, 138) the sensor elements (18, 20, 22, 24, 26, 28, 30, 32, 98, 100, 140) arranged there relative to one another stimulated to opposite reactions.
  19. '' 19. Sensor carrier (16, 64, 128) according to one of claims 15 to 18, characterized in that the first and the second sensor receiving point (108, 110) are symmetrical to one through the elevation (46, 48, 50, 52, 76, 78, 134) extending and arranged in the axial direction and in the radial direction.  <Desc / Clms Page number 26>  
20. Sensor carrier (16, 64, 128) according to one of the preceding claims, characterized in that the radially outer part (44, 74, 132) has a sensor receiving point (108, 110) for arranging the sensor element on an outside arranged in the radial direction (18.20, 22.24, 26, 28.30, 32.98, 100.140).
21. bicycle pedal bearing (10, 112) with a sensor carrier (16, 64, 128) according to one of the preceding claims.
PCT/EP2004/009577 2003-08-27 2004-08-27 Sensor carrier WO2005021368A1 (en)

Priority Applications (2)

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DE2003139304 DE10339304A1 (en) 2003-08-27 2003-08-27 sensor support

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WO2011154546A1 (en) * 2010-06-10 2011-12-15 Wiz Energy Technology Co., Ltd An axle bearing assembly
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DE102014203632A1 (en) * 2014-02-28 2015-09-03 Schaeffler Technologies AG & Co. KG Measuring device for a bottom bracket assembly of a bicycle and method for operating such a measuring device
WO2015127931A1 (en) * 2014-02-28 2015-09-03 Schaeffler Technologies AG & Co. KG Measuring device for a bottom bracket assembly of a bicycle, and method for operating a measuring device of this type
US9758211B2 (en) 2015-06-10 2017-09-12 Siral S.R.L. Transmission for means of transport with torque measurement
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