JP6644598B2 - Method and apparatus for measuring the angle of attack between a wheel and a rail of a railway vehicle - Google Patents

Description

  The present invention relates to a method for measuring an attack angle between a wheel of a railway vehicle and a rail, and an apparatus for implementing the method.

  The attack angle between the rail of a railway vehicle and a rail is an important factor that has a great influence on the curve passing performance of the railway vehicle. Therefore, measuring the attack angle between the wheel and the rail is important for evaluating the curve passing performance.

  Patent Literature 1 discloses a technique for measuring an attack angle between a wheel and a rail from a railroad vehicle side. As shown in FIG. 4, the technique disclosed in Patent Document 1 includes two laser displacement gauges 4a for measuring a distance from a wheel 3 and a rail 5 on a support 2 provided at a lower portion of the axle box 1. The two laser displacement gauges 4b for measuring the distance between the two are mounted at an interval of La and Lb, respectively, and the inclination angles of the wheel 3 and the rail 5 are calculated, and the attack angle is calculated from the difference between these two inclination angles. It is to calculate.

  However, the technique disclosed in Patent Literature 1 requires that four laser displacement meters be installed over a wide range in an axle box, which is an unsprung part. . In addition, the use of four laser displacement meters is expensive.

  In addition, when calculating the attack angle, there is a step of dividing the measured value by the intervals La and Lb, and even the longer interval La is about 500 mm.

JP 2011-163981 A

  The problem to be solved by the present invention is that the technique for measuring the angle of attack between a wheel and a rail disclosed in Patent Document 1 has a problem in durability due to an increase in mass, becomes expensive, and is apt to carry noise. That is the point.

  SUMMARY OF THE INVENTION It is an object of the present invention to measure the angle of attack between a wheel and a rail so that it is lightweight, has improved durability, is inexpensive, and is resistant to noise.

The method for measuring the attack angle between the wheel and the rail of the railway vehicle of the present invention is as follows.
To achieve the above objectives,
For a railway vehicle equipped with a two-axle bogie, measure the distance from the installation position of the axle before and after the vehicle traveling direction in the two-axle bogie to the rail side surface, and use the distance from the installation position of these front and rear axle to the rail side surface. The most important feature is that the yaw angle of the two-axle bogie is determined from the lateral displacement of the front and rear wheel shafts obtained as described above, and the yaw angle is used as the attack angle.

  The method of the present invention measures the longitudinal displacement of the axle boxes on both sides in the vehicle width direction that supports the front axle among the front and rear axles of the two-axle bogie, and uses the difference between the longitudinal displacements of the axle boxes on both sides to determine the front side. If the wheel set angle of the wheel set is obtained and the wheel set angle is added and corrected, the measurement accuracy is further improved.

The latter method of the present invention,
A distance sensor that measures the distance from the installation position of the wheel set before and after the vehicle traveling direction in the two-axle bogie to the side surface of the rail, of a railway car equipped with a biaxial bogie,
A displacement sensor that measures longitudinal displacement of axle boxes on both sides in the vehicle width direction that support a front wheelset among the front and rear wheelsets,
While determining the yaw angle of the two-axle bogie from the lateral displacement of the front and rear wheel axles obtained using the measurement distance from the installation position of the front and rear wheel axles measured by the distance sensor to the rail side surface, An arithmetic unit that determines the wheelset angle of the front wheelset using the difference between the longitudinal displacements of the axle box, and adds the wheelset angle of the front wheelset to the yaw angle of the truck obtained;
The present invention can be carried out using an apparatus for measuring the angle of attack of a wheel and a rail of a railway vehicle according to the present invention.

  The present invention, for example, only measures the distance from the installation position of the wheel set in the front and rear direction of the vehicle to the side of the rail, and the longitudinal displacement of the axle boxes on both sides in the vehicle width direction that supports the front wheel set, so one bi-axle truck Only four distance sensors and two displacement sensors are required, and the weight and the durability are improved. The inexpensive device can measure the angle of attack between the wheels and the rails.

  Further, in the present invention, since the distance between the distance sensors can be set to be long as the axis distance, a noise filtering effect can be easily obtained when obtaining the yaw angle of the bogie, and the noise resistance is increased.

  In the present invention, for example, four distance sensors and two displacement sensors are required for each two-axle truck, so that the weight and the durability are improved. Can be measured. Further, since the distance between the distance sensors becomes longer, a noise filtering effect can be easily obtained when obtaining the yaw angle of the cart, and the noise becomes stronger.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an attack angle measuring device for a wheel and a rail of a railway vehicle according to the present invention, where (a) is a diagram of a two-axle truck viewed from above when traveling in a straight section, and (b) is a diagram illustrating the two-axle truck traveling in a curved section. It is the figure which looked at the axle truck from the upper part. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the distance sensor which comprises the attack angle measuring device of the wheel and rail of the railway vehicle of this invention, (a) is the figure which looked at the wheel part from the side of the two-axle bogie, (b) is the wheel part FIG. 2 is a view as viewed from the front of a two-axle truck. 4 is a graph comparing an actual attack angle with a yaw angle of a two-axle bogie measured by an attack angle measuring method between a wheel and a rail of a railway vehicle according to the present invention, and an attack angle obtained from a wheel axis angle of a front wheel axle. FIG. 2 is a diagram similar to FIG. 1 illustrating an attack angle measuring device for a wheel and a rail of a railway vehicle described in Patent Document 1.

  An object of the present invention is to enable measurement of an attack angle between a wheel and a rail, which is lightweight, has improved durability, is inexpensive, and is resistant to noise. The object was achieved by measuring the distance from the installation position of the wheel set in the front and rear direction of the vehicle to the side of the rail, and the longitudinal displacement of the axle boxes on both sides in the vehicle width direction supporting the front wheel set.

  Hereinafter, an apparatus for measuring an attack angle between a wheel and a rail of a railway vehicle according to the present invention will be described with reference to FIGS. 1 and 2, and a book for measuring an attack angle between a wheel and a rail using this attack angle measuring apparatus. The method of the invention will be described.

Reference numeral 11 denotes an attack angle measuring device of the present invention, which measures an attack angle Ψ _w1 between a wheel 20 and a rail 13 constituting a front axle 14a of a railway vehicle equipped with a two-axle truck 12 when traveling on a curved section. It is.

  Reference numeral 15 denotes a distance sensor, for example, a laser distance meter that measures the distance from the installation positions of the wheel sets 14a, 14b in the front and rear directions of the two-axle carriage 12 to the side surface of the rail 13, for example, both sides of each wheel set 14a, 14b. , And four are installed on one two-axle carriage 12.

  In the embodiment shown in FIGS. 1 and 2, the distance sensor 15 is installed on the support 21 attached below the axle box 16, but the distance from the installation position of each axle 14 a, 14 b to the side surface of the rail 13. May be installed on the bogie frame 17 as long as the position can be measured.

  Reference numeral 18 denotes a displacement sensor, for example, a laser range finder for measuring the longitudinal displacement of the axle boxes 16 on both sides in the vehicle width direction that support the front axle 14a of the front and rear axles 14a, 14b. In the example, the longitudinal displacement of the axle box 16 is obtained by measuring the distance to the axle box 16 provided on the bogie frame 17. However, if the longitudinal displacement of the axle box 16 on both sides in the vehicle width direction can be measured, the displacement sensor 18 may be provided on the axle box 16 to measure the distance to the bogie frame 17. Incidentally, reference numeral 22 in FIG. 1 denotes a spring interposed between the axle box 16 and the bogie frame 17.

_{Reference numeral} 19 denotes an arithmetic unit, which is a front-rear and a front-rear obtained using the measured distances y _w1L , y _w1R , y _w2L , and y _w2R from the installation positions of the front and rear wheel axles 14a and 14b measured by the distance sensor 15 to the side surface of the rail 13. From the lateral displacements y _w1 and y _w2 of the wheel sets 14a and 14b, the yaw angle Ψ _b of the two-axle truck 12 is obtained by the following equation (1).
Ψ _b = tan ^-1 ((y _w1 −y _w2 ) / 2a) ... (1)
2a is a wheelbase of the two-axle truck 12.

The left-right displacement y _w1 of the front wheel set 14a is obtained by the following (2), and the left-right displacement y _w2 of the rear wheel set 14b is obtained by the following (3).
y _w1 = y _w1L -y _w1R ... (2)
y _w2 = y _w2L -y _w2R ... (3)

Further, the arithmetic unit 19, the front and rear displacement Derutaax _1L of both sides of the axle box 16 which supports the front wheel shaft 14a measured by the displacement sensor 18, by the following (4) using the difference of Derutaax _1R, front wheel shaft 14a Wheel axis angle Ψ _ax of
Ψ _ax = tan ^-1 ((Δax _1L -Δax _1R ) / D) (4)
D is the distance between the centers of the axle boxes 16 on both sides supporting the front axle 14a.

Then, the arithmetic unit 19, the (1) in the yaw angle [psi _b biaxial carriage 12 determined (4) adding the wheel axis angle [psi _ax wheelset 14a of the front determined in equation (Ψ _b + Ψ _ax ) To determine the attack angle Ψ _w1 of the front wheel set 14a when traveling on a curved section. This is the method of the present invention.

Incidentally, when traveling at a speed of 5 km / h on a curve section having a curve radius of 600 m, the yaw angle Ψ _b of the two-axle truck 12 obtained by the above equation (1) is 1.87 mrad, and the yaw angle Ψ _b is obtained by the above equation (4). in front of the wheel shaft 14a wheelset angle [psi _ax is 0.82mrad the attack angle [psi _w1 of the front wheel shaft 14a as determined by the method of the present invention is almost the same value as 2.69mrad next, the actual angle of attack 2.52mrad Was.

  The present invention is not limited to the above examples, and it goes without saying that the embodiments may be appropriately modified within the scope of the technical idea described in each claim.

  In the above embodiment, for example, four distance sensors 15 are installed on one biaxial carriage 12 on each side of each of the wheel sets 14a and 14b, but one on each side only in one side in the vehicle width direction. One or two distance sensors 15 may be installed on one two-axle carriage 12.

  In the above-described embodiment, a laser distance meter is used as the distance sensor 15 or the displacement sensor 18. However, the distance from the installation position of the wheel sets 14a and 14b to the side surface of the rail 13 and the distance between the axle box 16 of the front wheel set 14a. It is not limited to a laser distance meter as long as it can measure longitudinal displacement.

Further, in the above embodiment, the yaw angle Ψ _b of the two-axle bogie determined from the lateral displacement of the front and rear wheel axles 14a and 14b is used to calculate the yaw angle Ψ _b of the front wheel axle 14a using the difference between the longitudinal displacements of the axle boxes 16 on both sides. It is corrected by adding the wheel axis angle Ψ _ax. However, it may be the front and rear wheel sets 14a, the yaw angle [psi _b biaxial bogie determined from lateral displacement of 14b as an attack angle.

DESCRIPTION OF SYMBOLS 11 Attack angle measuring device 12 Two-axle trolley 13 Rail 14a Front wheel axle 14b Rear wheel axle 15 Distance sensor 16 Axle box 17 Bogie frame 18 Displacement sensor 19 Computing unit 20 Wheel

Claims (4)

  For a railway vehicle equipped with a two-axle bogie, measure the distance from the installation position of the axle before and after the vehicle traveling direction in the two-axle bogie to the rail side surface, and use the distance from the installation position of these front and rear axle to the rail side surface. A yaw angle of a two-axle bogie is determined from the lateral displacement of the front and rear wheel shafts obtained as described above, and the yaw angle is used as an attack angle. Measure the longitudinal displacement of the axle boxes on both sides in the vehicle width direction supporting the front axle of the front and rear axles, and determine the axle angle of the front axle by using the difference between the longitudinal displacements of these axle boxes,
A method for measuring an attack angle between a wheel and a rail of a railway vehicle, wherein the wheel axis angle is added to the attack angle according to claim 1 for correction.   The distance from the installation position of the front and rear wheel sets to the rail side surface to be measured includes at least the distance from the installation position of the wheel set on the same side in the vehicle width direction to the rail side surface. 3. The method for measuring an attack angle between a wheel of a railway vehicle and a rail according to the above. A distance sensor that measures the distance from the installation position of the wheel set before and after the vehicle traveling direction in the two-axle bogie to the side surface of the rail, of a railway car equipped with a biaxial bogie,
A displacement sensor that measures longitudinal displacement of axle boxes on both sides in the vehicle width direction that support a front wheelset among the front and rear wheelsets,
While determining the yaw angle of the two-axle bogie from the lateral displacement of the front and rear wheel axles obtained using the measurement distance from the installation position of the front and rear wheel axles measured by the distance sensor to the rail side surface, An arithmetic unit that determines the wheelset angle of the front wheelset using the difference between the longitudinal displacements of the axle box, and adds the wheelset angle of the front wheelset to the yaw angle of the truck obtained;
An attack angle measuring device for a railroad vehicle wheel and a rail, comprising:

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