GB2194061A - Method for determining technical condition of a pneumatic tyre - Google Patents
Method for determining technical condition of a pneumatic tyre Download PDFInfo
- Publication number
- GB2194061A GB2194061A GB8619733A GB8619733A GB2194061A GB 2194061 A GB2194061 A GB 2194061A GB 8619733 A GB8619733 A GB 8619733A GB 8619733 A GB8619733 A GB 8619733A GB 2194061 A GB2194061 A GB 2194061A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tyre
- pneumatic tyre
- cord
- contact
- pneumatic
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/52—Investigating hardness or rebound hardness by measuring extent of rebound of a striking body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Tires In General (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A method for determining technical condition of a pneumatic tyre in which a blow is imparted with a freely suspended body (1) of a predetermined mass to a lateral cord surface of a pneumatic tyre (2), the time of contact between this body (1) and the lateral surface of cord of the pneumatic tyre (2) is measured, and this parameter is compared with a respective reference parameter, the comparison result being used to determine spring ratio of the pneumatic tyre (2). The spring ratio depends on spring ratio of the tyre cord and the pressure of the tyre. By measuring the acceleration changes of the body e.g. by an accelerometer (10) secured to the body, whilst the body is in contact with the tyre, the tyre pressure may be determined. <IMAGE>
Description
SPECIFICATION
Method for determining technical condition of a pneumatic tyre
The invention relates to methods for testing operating characteristics of pneumatic tyres, and in particular, it deals with a method for determining technical condition of a pneumatic tyre.
The invention may be used in operation and maintenance of motor cars and trucks for a prompt check of a pneumatic tyre for technical condition.
One of the most important problems in operation and checking tests of automobile vehicles is a prompt determination of technical condition of a pneumatic tyre of the wheel, namely determination of its rigidity, air pressure in the tyre and spring rate of the tyre cord. Timely and accurate determination of these parameters of a tyre and appropriate correction to bring these parameters back to optimum values make it possible to substantially lower fuel consumption by automobile vehicles and improves their safety in operation.
Spring rate of a tyre and air pressure in the tyre are determined nowadays using direct or indirect methods. When a direct method of checking is used, it is necessary to unscrew a valve from the tyre which results in iowering of pressure in the type and reduced productivity of the method.
Indirect checking methods are based on measurement of deformation of a pneumatic tyre under the action of external force applied thereto; they are rather inaccurate and unproductive since they call for employment of unwieldy mechanical devices and feature a long time for preparation and conduct of measurements.
A known method for determining technical condition of a pneumatic tyre (B.S. Falkevich,
N.V. Divakov. Testing Automobile Vehicles.
Moscow, Mashgiz Publishing House, 1952, pp. 217-218) comprises imparting a blow to the cord of a pneumatic tyre with a freely suspended body of a predetermined mass, measuring a parameter of impact, comparing this parameter with-a respective reference parameter and determining the spring rate of the pneumatic tyre in accodance with the comparison result.
In the prior art method, a blow is delivered with the freely suspended body on the tread side in the radial direction, and the whole process of determination of technical condition of a pneumatic tyre resides in measuring damping ratio of the body oscillations until it has completely stopped which amounts to scores of seconds and comparing this damping ratio with a respective reference parameter. It should be, however, noted that carrying out this method requires that the wheel be removed from the vehicle and the tread surface of the tyre be appropriately positioned relative to the freely suspended body so that productivity of the method is rather low.
In addition, during the impact, external factors (roughness of the tread surface, friction, and the like) affect the damping time of oscillations amplitude, such factors being unconnected with spring ratio of the tyre, they would lower accuracy of measurement. As a blow is imparted in the radial direction to the pneumatic tyre being checked in accordance with the prior art method, it is difficult to determine pressure in the tyre because of a high inherent rigidity of the tyre cord on the tread side.
It is an object of the invention to improve accuracy of determination of technical condition of a pneumatic tyre without removing the wheel from the automobile vehicle.
This object is accomplished by that in a method for determining technical condition of a pneumatic tyre, comprising imparting a blow to the cord of a pneumatic tyre with a freely suspended body of a predetermined mass, measuring a parameter of impact, comparing this parameter with a respective reference parameter, and determining spring rate of the pneumatic parameter, and determining spring rate of the pneumatic tyre in accordance with the comparison result, according to the invention, the blow is imparted to the lateral surface of the pneumatic tyre cord, and in that the impact parameter is the time of contact between the freely suspended body and the lateral surface of the pneumatic tyre cord.
It is preferred that, concurrently with measuring the time of contact between the freely suspended body and the lateral surface of the pneumatic tyre cord, acceleration of this body be measured during the time interval within which it is in contact with the lateral surface of the tyre cord, this parameter be compared with a respective reference parameter, and rigidity of cord and pressure in the pneumatic tyre be determined in accordance with the comparison result.
Owing to the fact that a blow is imparted by the freely suspended body to the lateral surface of the pneumatic tyre cord, the method for determining technical condition of a pneumatic tyre allows the spring rate of the tyre to be determined without the tyre being removed from the automobile vehicle so that productivity of the method is substantially improved. Measuring the time of contact between the freely suspended body and the lateral surface of the pneumatic tyre cord improves accuracy of determination of the spring ratio of the tyre, and measuring acceleration of the body during the time interval within which it is in contact with the lateral surface of the tyre cord upon impact allows individual stages of impact to be characterized so as to evaluate rigidity of cord and pressure in the
pneumatic tyre.
The invention will now be described with
reference to specific embodiments illustrated
in the accompanying drawings, in which:
Figure 1 is a schematic view of an apparatus for determining technical condition of a
pneumatic tyre for carrying out a method for
determining technical condition of a pneumatic tyre according to the invention;
Figure 2 shows relationship of time of contact between a freely suspended body and
lateral surface of cord of a pneumatic tyre v.
pressure in the pneumatic tyre according to the invention;
Figure 3 is ditto of Fig. 1, with a comparison unit and a unit for forming reference values according to the invention;
Figure 4 is ditto of Fig. 1, with an accelerometer, an electric signal front former and acceleration measuring means according to the
invention;
Figure 5 shows relationship of a change in acceleration of a freely suspended body v.
time of contact thereof with the lateral surface of the pneumatic tyre cord according to the invention.
A method for determining technical condition of a pneumatic tyre essentially resides in the following. First, a freely suspended body 1 (Fig. 1) of a predetermined mass is brought close to the lateral surface of the cord of a pneumatic tyre 2 by moving it about a pivot pin 3 in such a manner that a contact pick-up 4 secured to the body 1 on the side thereof cooperating with the pneumatic tyre 2 should touch the lateral surface of the cord of the tyre 2 (this position of the body 1 is shown with dotted line in the drawing). Then the freely suspended body 1 is retracted at an angle a=400-600 with respect to the vertical (the value of this angle was determined exper mentally) and is released. The body 1 rotating about the pivot pin 3 imparts a blow to the lateral surface of the pneumatic tyre 2.It should be noted that a blow with the freely suspended body 1 may be imparted to the cord of the tyre 2 by the operator manually for a prompt checking of technical condition of the pneumatic tyre on a special test bench.
Depending on spring ratio of the tyre 2, the latter is deformed, and the body 1 enters the tyre 2 to a certain depth, the lower the spring ratio of the pneumatic tyre 2, the greater is its deformation, the greater is the depth at which the body 1 penetrates the tyre; and the longer is the time of contact between the body 1 and pneumatic tyre 2. Relationship of the time t of contact v. spring ratio k of the pneumatic tyre is determined from the following formula:
wherein
c is the constant value depending on the
type of the tyre 2;
m is the mass of the freely suspended
body 1;
k is the total spring ratio of the tyre 2
which is determined by the spring ratio
of the cord of the tyre 2 and pressure in
the tyre.
The value of mass m of the body 1 is chosen in accordance with the class of pneumatic tyres being checked and is directly proportional with load carrying capacity of an automobile vehicle.
Upon collision between the freely suspended body 1 with the tyre 2, the pick-up 4 (which may be of contact or non-contact type) is actuated, and electric signal from the pick-up output goes to a pulse former 5 wherein amplitude and fronts of the electric signal are formed and bounce is eliminated. Then the electric signal carrying information on the time of contact between the body 1 and the lateral surface of the cord of the tyre 2 goes to a device 6 for measuring time intervals length, and a signal from the output of this device is fed to an indicator 7. When the impact is over, a reading appears on the indicator toshow the time of contact, which is read-out and compared with a respective reference contact time taken from a scale, table or chart plotted for a given type of tyres, and the comparison result is used to determine spring ratio of the pneumatic tyre 2.As the value of spring ratio k of the pneumatic tyre 2 depends on pressure p in the tyre, i.e. k=F(p); pressure in the tyre 2 is determined from appropriate tables or charts. Fig. 2 shows an experimentally obtained relationship of the time t of contact plotted along the ordinates v. pressure p in the tyre plotted on abscissa for various types of tyres.
The operation of comparing the time of contact with a respective reference parameter, taking into account various factors (mileage, vehicle type, and the like) can be carried out in a comparison unit 8 (Fig. 3) having one input that receives data on the time of contact from the output of the device 6 for measuring time intervals and the other input that receives data from the output of a unit 9 for forming reference values, data on the type of the tyre 2 and type of the vehicle in which the tyre 2 is used being put into the unit 9 before starting determination of technical condition of the pneumatic tyre 2. Other data for a more accurate checking of technical conditions of the pneumatic tyre such as mileage of the tyre, atmospheric pressure, ambient air temperature may also be put into the unit 9 for forming reference values.
Imparting a blow with the freely suspended body 1 to the lateral surface of the cord of the pneumatic tyre 2, which has a lower inherent rigidity in the axial direction, and measuring the time of contact as impact para meter improve accuracy of determination of spring ratio of the tyre 2 and productivity of the method since the measurement process lasts several seconds only and there is no need to remove the wheel from the vehicle.
The method according to the invention makes it possible to determine technical condition of each pneumatic tyre 2 in a wheel pair on either side of a lorry axle. In addition, measuring the time of contact during the first collision of the freely suspended body 1-with the lateral surface of cord of the pneumatic tyre 2 eliminates influence of external factors unconnected with spring ratio of the pneumatic tyre 2 (cord roughness, friction) that might otherwise cause an error at the stage of damping of oscillations of the freely suspended body 1.
For a more accurate determination of technical condition of the pneumatic tyre 2, concurrently with measurement of the time of contact between the freely suspended body 1 and the lateral surface of the cord of the pneumatic tyre 2, acceleration of the body 1 is measured during the time interval of its contact with the lateral surface of cord of the pneumatic tyre 2. The time t of contact is measured as described above and is displayed on the indicator 7. At the same time, an electric signal from an accelerometer 10 (Fig. 4) secured to the other side of the freely suspended body 1 or inside the body 1 goes to an electric signal front former 11 and then to a device 12 for measuring acceleration.The electric signal from the device 12 for measuring acceleration is fed to another input of the indicator 7 so that the latter will record the time of contact and a change in acceleration during the collision at the end of collision of the freely suspended body 1 with the pneumatic tyre 2 on a chart paper or on a memorizing persistent CRT. Thus a change in the counteracting force depending on time beginning from the moment of impact is taken into account. Fig. 5 shows the character of a change in acceleration d2h dt2 of the freely suspended body plotted on the ordinates v. the time of contact t with the lateral surface of the pneumatic tyre cord plotted on the abscissa.
It can be seen that in the starting area AB (Fig. 5, curve a) of the impact inclination of the curve depends on physical properties of cord of the tyre 2 (Fig. 4), and pressure in the tyre 2 prevails in the area BC (Fig. 5, curve a).
The bending point C (Fig. 5, curve a) is indicative of a change in sign of the derivative of acceleration of the body 1 (Fig. 4), and the area CD (Fig. 5, curve a) shows a change in acceleration of the body 1 (Fig. 4) caused by pressure in the tyre 2 when the body returns to the initial position. The final area DE (Fig.
5, curve a) is determined also by physical properties of the cord of the tyre 2 similarly to the area AB.
During interaction between the freely suspended body 1 and the lateral surface of cord of the tyre 2 in which pressure is higher than that in the abovedescribed case, the character of a change in acceleration of the body 1 will be different (Fig. 5, curve b). In the area AB, which characterizes rigidity of cord, curves for tyres with different pressure values will be substantially identical, and curve portions inthe areas DE and D'E' are of the same length and have the same inclination with respect to the ordinates because they are also determined by cord rigidity. The curve in the areas
B'C' and C'D' characterizing pressure in the tyre 2 (Fig. 4) will be steeper than for a weakly inflated tyre 2.
Therefore, measuring acceleration of the freely suspended body 1 cooperating with the lateral surface of the cord of the tyre 2 allows more information to be obtained for individual time intervals of the impact as compared with the generalized parameter in the form of the time of contact between the body 1 and the lateral surface of the cord of the tyre 2.
Then readings are taken from the indicator 7 to obtain the time of contact and acceleration of the freely suspended body 1, and these readings are compared with respective reference values on a scale, tables or charts, and the comparison results are used to determine spring ratio of cord and pressure in the tyre 2 using characteristics of individual stages of the impact. When pressure in the tyre 2 is determined, contact time areas characterizing physical properties of cord are subtracted from the total contact time.
The method for determining technical condition of a pneumatic tyre makes use of additional data on character of changes in acceleration of the freely suspended body during collision with the tyre in individual areas of the impact process, in addition to the time of contact between the freely suspended body and tyre, the final assessment of technical condition of the pneumatic tyre being made after the comparison of the time of contact between the body and tyre and individual areas of changes in acceleration with respective reference data recorded beforehands. This allows accuracy of determination of technical conditions of a pneumatic tyre to be improved.
Claims (3)
1. A method for determining technical condition of a pneumatic tyre, wherein a blow is imparted to the lateral surface of a pneumatic tyre cord with a freely suspended body of a predetermined mass, the time of contact between this body and the lateral surface of the pneumatic tyre cord is measured, this parameter is compared with a respective reference parameter, and spring ratio of the tyre cord is determined in accordance with the comparison result.
2. A method for determining technical condition of a pneumatic tyre as claimed in claim 1, wherein, concurrently with measuring the time of contact between the freely suspended body and the lateral surface of the pneumatic tyre cord, acceleration of the body is measured during the time interval within which it is in contact with the lateral surface of the pneumatic tyre cord, this parameter is compared with a respective reference parameter, and the comparison result is used for determining cord rigidity and pressure in the pneumatic tyre as well.
3. A method for determining technical condition of a pneumatic tyre substantially as hereinabove described with reference to, and as shown in the accompanying drawings.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863620638 DE3620638A1 (en) | 1986-06-20 | 1986-06-20 | Method for determining the technical state of a pneumatic tyre |
| GB8619733A GB2194061A (en) | 1986-06-20 | 1986-08-13 | Method for determining technical condition of a pneumatic tyre |
| CH3279/86A CH670510A5 (en) | 1986-06-20 | 1986-08-15 | |
| AT0224286A AT386899B (en) | 1986-06-20 | 1986-08-20 | METHOD FOR CHECKING A TIRE |
| FR8612049A FR2603002B1 (en) | 1986-06-20 | 1986-08-25 | METHOD FOR EVALUATING THE TECHNICAL CONDITION OF A TIRE FOR VEHICLES |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863620638 DE3620638A1 (en) | 1986-06-20 | 1986-06-20 | Method for determining the technical state of a pneumatic tyre |
| GB8619733A GB2194061A (en) | 1986-06-20 | 1986-08-13 | Method for determining technical condition of a pneumatic tyre |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8619733D0 GB8619733D0 (en) | 1986-09-24 |
| GB2194061A true GB2194061A (en) | 1988-02-24 |
Family
ID=25844782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8619733A Withdrawn GB2194061A (en) | 1986-06-20 | 1986-08-13 | Method for determining technical condition of a pneumatic tyre |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT386899B (en) |
| CH (1) | CH670510A5 (en) |
| DE (1) | DE3620638A1 (en) |
| FR (1) | FR2603002B1 (en) |
| GB (1) | GB2194061A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998053289A1 (en) * | 1997-05-17 | 1998-11-26 | Snap-On Equipment Limited | Method and apparatus for tyre pressure determination |
| WO2000036382A2 (en) * | 1998-12-11 | 2000-06-22 | Sonvert Ltd. | An apparatus for measuring internal pressure and method therefor |
| CN100414280C (en) * | 2004-06-16 | 2008-08-27 | 韩国轮胎株式会社 | Tire sidewall impact test device |
| CN102564720A (en) * | 2011-12-02 | 2012-07-11 | 江苏凯特汽车部件有限公司 | Compound impact test equipment used for automobile wheel |
| US20130073246A1 (en) * | 2011-09-19 | 2013-03-21 | James Kenyon Sprague | Tire Pressure Measuring Device |
| US20160030815A1 (en) * | 2011-09-19 | 2016-02-04 | James Kenyon Sprague | Method and device for detecting under-inflated game balls during a football game |
| CN107515163A (en) * | 2017-08-18 | 2017-12-26 | 安徽江淮汽车集团股份有限公司 | Tire side shock pressure experiments device |
| CN109406305A (en) * | 2018-09-29 | 2019-03-01 | 蚌埠市龙子湖区金力传感器厂 | A kind of Charpy impact force snesor experimental provision |
| WO2019185114A1 (en) * | 2018-03-26 | 2019-10-03 | Siemens Industry Software Nv | Impact testing device and method for operating an impact testing device |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0351430B1 (en) * | 1986-08-28 | 1994-05-04 | Mitsui Engineering and Shipbuilding Co, Ltd. | Impact-type apparatus for inspecting structures |
| DE102007051478A1 (en) * | 2007-10-27 | 2009-04-30 | Continental Aktiengesellschaft | Carcass thread tension measuring method for tire of vehicle, involves receiving acoustic or vibration response signals, evaluating acoustic or vibration response signals, and evaluating tension based on curve path of response signal |
| CN101949761A (en) * | 2010-09-21 | 2011-01-19 | 中信戴卡轮毂制造股份有限公司 | Wheel radial impact testing method |
| CN106353112B (en) * | 2016-08-25 | 2019-01-15 | 浙江理工大学 | High-speed EMUs wheel impact fatigue testing machine |
| CN109991021B (en) * | 2017-12-29 | 2024-05-28 | 上汽通用五菱汽车股份有限公司 | Multi-angle tire dynamic stiffness test device |
| CN108645627A (en) * | 2018-05-03 | 2018-10-12 | 厦门理工学院 | A kind of pendulum collision test device and its test method for two wheeler |
| CN109580258B (en) * | 2019-01-24 | 2020-11-13 | 中汽研（天津）汽车工程研究院有限公司 | Dynamic mechanical property testing system of tire |
| US10942078B2 (en) | 2019-05-31 | 2021-03-09 | TYCKit GmbH | Measurement of pressure in pressure-filled containers with flexible walls, in particular tires |
| CN113063609B (en) * | 2021-05-12 | 2024-06-04 | 青岛博锐智远减振科技有限公司 | Detection method and detection test bed for automobile air spring air bag cord |
| CN115855712B (en) * | 2023-03-03 | 2023-04-21 | 北京阿玛西换热设备制造有限公司 | Rubber rebound resilience measuring instrument |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1163144A (en) * | 1965-12-13 | 1969-09-04 | Beloit Easter Corp | Hardness Testing. |
| GB1358131A (en) * | 1971-10-15 | 1974-06-26 | Schmidt E | Hardness testing |
| US3879982A (en) * | 1972-10-16 | 1975-04-29 | Ernst Schmidt | Method and apparatus for testing hardness of specimens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1809347A (en) * | 1928-05-31 | 1931-06-09 | Firestone Tire & Rubber Co | Tire testing machine |
| US4799375A (en) * | 1983-10-26 | 1989-01-24 | Pcb Piezotronics, Inc. | Instrumented test hammer |
-
1986
- 1986-06-20 DE DE19863620638 patent/DE3620638A1/en active Granted
- 1986-08-13 GB GB8619733A patent/GB2194061A/en not_active Withdrawn
- 1986-08-15 CH CH3279/86A patent/CH670510A5/de not_active IP Right Cessation
- 1986-08-20 AT AT0224286A patent/AT386899B/en not_active IP Right Cessation
- 1986-08-25 FR FR8612049A patent/FR2603002B1/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1163144A (en) * | 1965-12-13 | 1969-09-04 | Beloit Easter Corp | Hardness Testing. |
| GB1358131A (en) * | 1971-10-15 | 1974-06-26 | Schmidt E | Hardness testing |
| US3879982A (en) * | 1972-10-16 | 1975-04-29 | Ernst Schmidt | Method and apparatus for testing hardness of specimens |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998053289A1 (en) * | 1997-05-17 | 1998-11-26 | Snap-On Equipment Limited | Method and apparatus for tyre pressure determination |
| AU732281B2 (en) * | 1997-05-17 | 2001-04-12 | Snap-On Equipment Limited | Method and apparatus for tyre pressure determination |
| WO2000036382A2 (en) * | 1998-12-11 | 2000-06-22 | Sonvert Ltd. | An apparatus for measuring internal pressure and method therefor |
| WO2000036382A3 (en) * | 1998-12-11 | 2000-09-14 | Sonvert Ltd | An apparatus for measuring internal pressure and method therefor |
| CN100414280C (en) * | 2004-06-16 | 2008-08-27 | 韩国轮胎株式会社 | Tire sidewall impact test device |
| US20130073246A1 (en) * | 2011-09-19 | 2013-03-21 | James Kenyon Sprague | Tire Pressure Measuring Device |
| WO2013043541A3 (en) * | 2011-09-19 | 2013-08-01 | Sprague James Kenyon | Tire pressure measuring device |
| US9188498B2 (en) * | 2011-09-19 | 2015-11-17 | James Kenyon Sprague | Tire pressure measuring device |
| US20160030815A1 (en) * | 2011-09-19 | 2016-02-04 | James Kenyon Sprague | Method and device for detecting under-inflated game balls during a football game |
| CN102564720A (en) * | 2011-12-02 | 2012-07-11 | 江苏凯特汽车部件有限公司 | Compound impact test equipment used for automobile wheel |
| CN107515163A (en) * | 2017-08-18 | 2017-12-26 | 安徽江淮汽车集团股份有限公司 | Tire side shock pressure experiments device |
| WO2019185114A1 (en) * | 2018-03-26 | 2019-10-03 | Siemens Industry Software Nv | Impact testing device and method for operating an impact testing device |
| CN111919101A (en) * | 2018-03-26 | 2020-11-10 | 西门子工业软件公司 | Impact testing device and method for operating an impact testing device |
| CN109406305A (en) * | 2018-09-29 | 2019-03-01 | 蚌埠市龙子湖区金力传感器厂 | A kind of Charpy impact force snesor experimental provision |
Also Published As
| Publication number | Publication date |
|---|---|
| CH670510A5 (en) | 1989-06-15 |
| DE3620638A1 (en) | 1987-12-23 |
| FR2603002B1 (en) | 1988-12-09 |
| ATA224286A (en) | 1988-03-15 |
| FR2603002A1 (en) | 1988-02-26 |
| DE3620638C2 (en) | 1989-12-14 |
| GB8619733D0 (en) | 1986-09-24 |
| AT386899B (en) | 1988-10-25 |
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