Classifications

• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
  • A63B22/00—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
  • A63B22/06—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement
  • A63B22/0605—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement performing a circular movement, e.g. ergometers
• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
  • A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
  • A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
  • A63B71/0619—Displays, user interfaces and indicating devices, specially adapted for sport equipment, e.g. display mounted on treadmills
  • A63B2071/065—Visualisation of specific exercise parameters
  • A63B2071/0652—Visualisation or indication relating to symmetrical exercise, e.g. right-left performance related to spinal column
• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
  • A63B2220/00—Measuring of physical parameters relating to sporting activity
  • A63B2220/50—Force related parameters
  • A63B2220/54—Torque
• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
  • A63B2220/00—Measuring of physical parameters relating to sporting activity
  • A63B2220/50—Force related parameters
  • A63B2220/58—Measurement of force related parameters by electric or magnetic means

Definitions

• the invention relates to a method and a device for force, torque and power measurement on an ergometer or bicycle, as a result of a proper use of the same torque transmission from two pedals equipped cranks via a shaft on a belt drive and further on an ergometer flywheel or the rear wheel of the bicycle takes place, and wherein the belt drive comprises a pulley or a sprocket, which is connected in at least one direction of rotation with the shaft.
• Ergometers and bicycles have been used for some time as training devices and / or for rehabilitation, and it makes sense during the intended use of these devices to measure the power applied by the user during training and evaluate accordingly.
• Elaborate solutions for detecting the applied power include the evaluation of the voltage in a belt drive, for example a chain, via which the applied force can be determined and from which in turn can be converted to the power in conjunction with a measured angular speed.
• a belt drive for example a chain
• a so-called power meter for a crankshaft drive of a bicycle is also known, in which the force applied by a person is measured directly at the bottom bracket of the bicycle.
• the pedaling force is converted into an electrical signal by the deformation of a suitable bending element, on which strain gauges are applied, and transmitted by inductive transmission to a receiver connected to the bicycle frame.
• the pedaling speed is determined by the pedaling frequency. Both values, treading force and pedaling speed, are processed in a microcomputer on the bicycle, displayed and stored or converted into a power.
• an AC powered sensor coil is used to induce the magnetic field into a ferromagnetic torque transmitting shaft.
• a secondary take-up coil or other means monitors the changes in the induced magnetic field as the voltages in the shaft change with torque.
• the voltage signal induced in the secondary coil is an indicator of the torque.
• DE 34 17 893 A1 describes an arrangement for non-contact detection or non-contact measurement of mechanical stress states of machine parts, such as shafts, with a magnetostrictive torque sensor, wherein a layer of amorphous, magnetostrictive material is arranged on the shaft. Under the influence of mechanical stresses, this layer changes its magnetic permeability, so that in turn the inductance of a sensor arranged in the vicinity of this layer, which comprises at least one coil, is changed.
• the coating may be sputtered or electrolytically deposited on the shaft or formed in sheet form and glued or welded to the shaft.
• the invention is based on the object, an improved method for force, torque and power measurement on an ergometer or to provide a bicycle and a device for its implementation, which is suitable for low metrological effort reliable measurement results and to capture separately for both legs of the ergometer or the bicycle properly used user.
• the invention is based on the finding that conventional measuring methods on ergometers or bicycles, which are geared in particular to stress measurements in the belt drive or force measurements by means of strain gauges, are complicated and accordingly expensive.
• the object is therefore initially achieved by a method for force, torque and power measurement on an ergometer or bicycle, as a result of a proper use of the same a torque transmission from two cranks fitted with pedals via a shaft on a belt drive and further on an ergometer Flywheel or the rear wheel of the bicycle takes place, and wherein the belt drive comprises a pulley or a sprocket which is rotatably connected to the shaft in at least one direction of rotation.
• the elastic torsion of the shaft is detected in each case according to the principle of magnetostriction.
• the generated sensor signals can be fed to the storage and / or evaluation unit electrically or without contact.
• the invention provides that to determine the power provided by the user with his right and / or left leg, the rotational speed of the shaft is detected and the storage and / or evaluation unit is supplied, and that in the latter by dividing the on the right shaft - And / or left-side torque with the measured speed is calculated by the user with his right leg and / or his left leg performance is calculated.
• Appliance related to the invention relates to a device for force and power measurement on an ergometer or bicycle, which due to a proper use of the ergometer or bicycle torque transmission of two pedals equipped with cranks via a shaft on a belt drive and further on an ergometer flywheel or the rear wheel of the bicycle takes place, and wherein the belt drive comprises a pulley or a sprocket, which is rotatably connected to the shaft in at least one direction of rotation.
• These sensor systems for measuring the elastic torsion of the shaft are each particularly advantageously formed by at least one magnetostrictive torque sensor.
• the torque sensors each comprise at least one magnetically coded region on the shaft and at least one sensor coil arranged at a distance therefrom.
• the magnetically coded regions of the shaft can be formed by magnetostrictive material coatings fixedly connected to the shaft or by separate, shaft-fixed attachments of said magnetostrictive material.
• tachometers to be arranged on the surface of the shaft, which interact with a rotational speed sensor which is arranged radially above the rotational speed sensors and with the storage and / or evaluation unit connected is.
• the rotational speed sensors moved past the rotational speed sensor generate a rotational speed signal in the rotational speed sensor which is forwarded to the storage and / or evaluation unit.
• the torque sensors are each electrically or non-contact connected to an electronic memory and / or evaluation unit for processing generated sensor signals of the detected deformations of the shaft.
• the pulley or the sprocket including the axially arranged on either side of the pulley or the sprocket sensor systems within a two-axis bearing axially of the bearing areas of the same be arranged.
• the pulley or the sprocket can also be arranged outside of an axially limited region of two bearing points of the shaft, wherein both sides of the pulley or the sprocket, the sensors are arranged, and wherein at least one sensor within said range is arranged.
• FIG. 1 shows an inventive shaft of an ergometer with a pulley and measuring device arranged between two bearing points according to a first embodiment
• FIG. 2 shows an inventive shaft of an ergometer with a pulley arranged outside a region between two bearing points according to a second embodiment.
• shaft 1 of the bottom bracket of a known and thus not shown in detail ergometer allows a Torque transmission from two cranks fitted with pedals via this shaft 1 to a belt drive and further to an ergometer flywheel.
• the shaft 1 is rotatably mounted by means of rolling bearings at two bearings 2, 3 in a not-shown frame of the ergometer.
• the belt drive is designed as a belt drive and has a belt pulley 4, which is connected in a rotationally fixed manner to the shaft 1 at least in one direction of rotation.
• the pulley 4 is axially on each side of the pulley 4 respectively a sensor 5 or 6 for non-contact detection of deformations in the form of elastic from the torque transmission Twists of the shaft 1 is provided.
• the elastically sensed elastic torsions provide a measure of the forces or torques applied to the shaft 1 for mathematically determining the power provided by the operator per unit time of both the left and the right leg of the user of the ergometer.
• the measuring means are each formed by at least one magnetostrictive torque sensor 5 or 6 and comprise a magnetically coded region 5a, 6a on the shaft 1 and at least one spaced apart sensor coil 5b, 6b.
• the mode of operation of such magnetostrictive torque sensors 5, 6 has already been explained in detail in the introduction.
• the magnetically coded regions 5 a, 6 a are preferably formed by coatings of magnetostrictive material fixedly connected to the shaft 1.
• the torque sensors 5, 6 and their sensor coils 5b, 6b are each electrically or non-contact, for example by radio or ultrasound, with an electronic memory and / or evaluation unit 7 for processing generated by the sensors 5, 6 sensor signals 8, 9 of detected deformations or elastic torsions of the shaft 1 connected.
• the electrical voltage required for this purpose is expediently provided by a stationary electrical network and / or one or more accumulators.
• the pulley 4, together with the sensor systems 5, 6 arranged axially on both sides, is disposed within a region of the shaft 1 which is axially delimited by the two bearing points 2, 3 of the shaft 1, whereby an extremely compact and accordingly View of the required space minimized arrangement is created.
• the embodiment shown in Fig. 2 differs from the above-described variant essentially in that the pulley 4 is arranged axially outside of the enclosed between the two bearing points 2, 3 of the shaft 1 area, although also axially on both sides of the pulley 4, the sensors 5 6, but at least one of the sensors 5 is arranged within said area.
• FIG. 2 shows that magnetic signal transmitters 10 are arranged at a distance from one another at the circumference of the shaft 1, which cooperate with a rotational speed sensor 11 known per se, which is positioned at a radial distance above the rotational speed sensor 10.
• a rotational speed sensor 11 known per se
• the rotational speed sensor 10 passes below the rotational speed sensor 11 due to a rotational movement of the shaft 1, it registers the changing magnetic field and generates a rotational speed.
• Signal 12 which is forwarded to the storage and / or evaluation unit 7. It is also possible, instead of the described measuring principle, to use other measuring principles for detecting the rotational speed of the shaft 1, for example known optical measuring systems.
• the torque applied to the respective side of the shaft 1 per unit of time can be determined in the storage and / or evaluation unit 7, and accordingly the respectively used power of the user .
• the knowledge of the user's performance, particularly that applied by his right and / or left leg, is of interest not only for informing the user of the ergometer, but also for accurately adjusting the mechanical resistance of the ergometer's braking device, such as a Related eddy current brake or a band brake.
• the brake torque or the braking power of the eddy current brake is estimated from the supply voltage of the eddy current brake with the aid of a mathematically non-proportional relationship, which is intended to counteract or counteract the user of the ergometer.
• the accuracy is in the range of ⁇ 10% to the actual value of the braking torque, which is judged to be insufficient, at least in diagnostically used ergometers. Therefore, calibration of the eddy-current brake usually takes place in such known ergometers in order to find out the non-proportional relationship between the supply voltage of the eddy current brake and its braking effect (braking torque, braking power) and the accuracy of the braking torque setting or the torque required according to a DIN specification. and to reach the user. In the measuring system according to the invention and in particular of FIG. 2, such an effort is not necessary, since the torque applied by the user of the ergometer or the power is continuously determined on the basis of the torque and rotational speed measurement.
• the above embodiments make reference to an ergometer with a wrap-around drive in the form of a belt drive.
• the invention is not limited to these exemplary embodiments, but also encompasses looping drives in the form of chain drives and conventional bicycles with belt or chain drive, which according to the invention with the special sensors 5, 6 for detecting the elastic torsion of the shaft 1 in the area of the bottom bracket under load of the same during normal use, preferably with magnetostrictive torque sensors 5, 6 are equipped (not shown in detail).

Landscapes

• Health & Medical Sciences (AREA)
• Cardiology (AREA)
• Vascular Medicine (AREA)
• General Health & Medical Sciences (AREA)
• Physical Education & Sports Medicine (AREA)
• Force Measurement Appropriate To Specific Purposes (AREA)
• Excavating Of Shafts Or Tunnels (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=40076752

Family Applications (1)

Country Status (8)

Families Citing this family (39)

Family Cites Families (8)

• 2007
  • 2007-08-24 DE DE102007040016A patent/DE102007040016A1/de not_active Withdrawn
• 2008
  • 2008-07-24 JP JP2010521292A patent/JP2010537173A/ja active Pending
  • 2008-07-24 AT AT08801075T patent/ATE512700T1/de active
  • 2008-07-24 WO PCT/DE2008/001237 patent/WO2009026873A1/fr not_active Ceased
  • 2008-07-24 BR BRPI0815718-9A2A patent/BRPI0815718A2/pt not_active Application Discontinuation
  • 2008-07-24 EP EP08801075A patent/EP2185250B1/fr not_active Not-in-force
  • 2008-07-24 CN CN200880104545XA patent/CN101784308B/zh not_active Expired - Fee Related
  • 2008-07-24 US US12/674,472 patent/US8316709B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events