0001]The present invention is fastened to the wheels of the rail vehicle, to a brake disc for rail vehicles which generates a braking force by being pressed is slidable contact member.
BACKGROUND
[0002]Prior to, signed a brake disk to a wheel of the rail vehicle, there is a braking system to generate a braking force to the wheels by pressing the sliding member to the brake disc. During running of the railway vehicle, a large noise is relatively is known to occur in the vicinity of the brake disc.
　Patent Document 1, as a technique related to the present invention, a technique for reducing noise arising from the brake disk when traveling of the railway vehicle is shown. The technique of Patent Document 1, by adjusting the opening area of the air flow path for cooling provided on the back surface of the brake disc, by suppressing the amount of air flowing between the, thereby reducing the noise.
CITATION
Patent Document
[0003]
Patent Document 1: JP 2007-205428 JP
Summary of the Invention
Problems that the Invention is to Solve
[0004]
　Brake disk of Patent Document 1 can reduce noise in the channel of the cooling air provided on the back surface. However, employing a brake disk of Patent Document 1, still, the noise generated from the periphery of the brake disc were large. Therefore, currently it is desired to further reduce noise generated from the periphery of the brake disc.
　The present inventors have tested, provided on the surface of the brake disc, the opening of the through hole for inserting a bolt was found to have become one of sources of noise. Through holes are provided for fastening the brake disc to the wheel of the railway vehicle.
[0005]
　On the other hand, the opening portion of the through hole for inserting a bolt, the surface of against which the brake disc push sliding member. Thus, changing the size or shape of the openings, the contact area is changed between the brake disc and the sliding member, there is a problem that affects the damping characteristics of the brake disc occurs.
　The present invention, while suppressing a decrease in braking capability, and an object thereof is to provide a brake disc which through holes for inserting the bolts can reduce the noise causes.
Means for Solving the Problems
[0006]
　The present invention, in order to achieve the above object,
　a disk plate portion having a sliding portion on the surface,
　from the surface of the disc plate portion through the back surface, for fastening the wheels of the disc plate and the train vehicle and a through hole bolt is passed through,
　the edge of the opening of the through hole on the surface side of the disc plate portion spreads greatly in the circumferential direction of the disc plate portion than the radius direction of the disc plate portion it was the brake disc for rail vehicles, characterized in that inclined surfaces are provided.
[0007]
　According to this arrangement, the inclined surfaces provided at the edge of the opening of the through hole, turbulence caused by the opening of the through hole during rotation of the brake disc is suppressed, thereby reducing the noise generated by the opening . In general, the opening edge portion of the direction orthogonal to the rotating direction of the brake disc is likely to occur noise due likely to occur turbulence, the edge of the rotating direction parallel orientation occurs turbulence noise is less likely to occur for difficult. Therefore, the inclined surface than the radius direction of the disc plate portion by providing so as to spread largely in the circumferential direction of the disc plate portion, without unnecessarily reducing the contact area between the disk plate portion and the sliding member, efficient noise can be reduced to.
[0008]
　Here, the site at circumferential positions of the disk plate from the center of the opening of the inclined surface may by mass or less of C plane or R plane 4mm not more than 24 mm.
　The noise generated by the opening by such inclined surface can be significantly reduced.
[0009]
　Further, a portion from the center of the opening in the circumferential position of the disc plate portion of said inclined surface still good if is C face or R face of 6 mm ± 15%.
　The noise generated by the opening by such inclined surface can be significantly reduced.
[0010]
　Furthermore, whether the site from the center of the opening of the opening in the radial position of the disc plate portion no inclined surfaces, the inclined surface is provided which is less C plane or R plane 2mm When may.
　Such inclined surfaces, without wastefully reducing the contact area between the disk plate portion and the sliding member can be efficiently reduce noise.
The invention's effect
[0011]
　According to the present invention, while suppressing the reduction in braking capability, it can provide a brake disc that can reduce the noise generated by the opening of the through hole for inserting a bolt.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012]
Is a perspective view showing an example of a braking system in FIG. 1 railcar.
Is a plan view showing the surface side of the brake disk according to FIG. 2 embodiment.
It is a plan view showing a first example of a through hole for inserting the Figure 3A] volts.
Is a diagram showing a first example of a through hole for inserting the Figure 3B] volts, is an A-A line sectional view of FIG. 3A.
It is a diagram showing a first example of a through hole for inserting the Figure 3C] volts, a B-B line sectional view of FIG. 3A.
It is a diagram showing a first example of a through hole for inserting the Figure 3D] volts, a sectional view taken along line C-C of Figure 3A.
Is a plan view showing a second example of a through hole for inserting the Figure 4A] volts.
Is a diagram showing a second example of a through hole for inserting the Figure 4B] volts, is an A-A line sectional view of FIG 4A.
It is a diagram showing a second example of a through hole for inserting the Figure 4C] volts, a B-B line sectional view of FIG 4A.
It is a diagram showing a second example of a through hole for inserting the Figure 4D] volts, a sectional view taken along line C-C of Figure 4A.
It is a plan view showing a third example of the through hole for inserting the Figure 5A] volts.
It is a plan view showing a fourth example of the through hole for inserting the Figure 5B] volts.
It is a plan view showing a fifth example of the through hole for inserting the Figure 5C] volts.
It is a plan view showing a sixth example of the through hole for inserting the Figure 5D] volts.
It is a plan view showing a seventh example of the through hole for inserting the Figure 5E] volts.
6 is a frequency characteristic graph showing the results of noise tests.
7 is a bar graph showing the results of a noise test.
8 is a graph showing the relationship between the size and the peak noise level of the inclined surface.
DESCRIPTION OF THE INVENTION
[0013]
　It will be described in detail with reference to the drawings the embodiments of the present invention.
　Figure 1 is a perspective view showing an example of a braking system in a railway vehicle. Figure 2 is a plan view showing the surface side of the brake disc for a railway vehicle according to the embodiment.
　Brake system of the first embodiment of the present invention is mounted on a high speed train. The brake system includes a brake disc 10 which is fastened to the side of the wheel 100 of the rail vehicle, the sliding member 200 to generate a braking force in contact with the brake disc 10 is pressed against the sliding contact member 200 to the brake disc 10 possible and a movable portion 210. The brake disc 10 and the sliding member 200 is not particularly limited, provided respectively on both sides of one wheel 100, the movable portion 210 is configured so as to sandwich the wheel 100 with two sliding members 200.
[0014]
　Brake disc 10 is an annular disk, the surface 10f of the disc plate portion 10a is sliding portion. The back surface of the disc plate portion 10a, a plurality of vertical fins and transverse fins not shown is provided, the passage through which air for cooling these are formed. Among the brake disc 10, the plate-like portion excluding the vertical fin and horizontal ribs called disc plate portion 10a.
[0015]
　The disk plate portion 10a, a plurality of through-holes 12 penetrating from the front surface to the back surface to pass the bolts is provided. A plurality of through-holes 12 are provided on the same diameter upper disk plate portion 10a, and are arranged at equal intervals in the circumferential direction of the disc plate 10a.
[0016]
　3A is a plan view showing a first example of a through hole for inserting a bolt, FIG. 3B is its sectional view taken along line A-A, FIG. 3C is its sectional view taken along line B-B, FIG. 3D is the C it is -C line cross-sectional view.
　4A is a plan view showing a second example of a through hole for inserting a bolt, FIG. 4B is its A-A line cross-sectional view, FIG. 4C is its sectional view taken along line B-B, Fig. 4D is the C it is -C line cross-sectional view.
[0017]
　Through hole 12 has a small diameter portion 12t diameters passing the shank of the bolt, and a large large diameter portion 12w having a diameter head or nut of the bolt is placed, the larger diameter portion 12w disc plate portion 10a It refers to portions of the surface 10f of the cross and the opening. Also refers to the portion where the center axis of the through-hole 12 intersects with the surface 10f of the disc plate portion 10a and the center 12c of the opening. Figure 3B, 3C, 3D, and FIG. 4B, FIG. 4C, in FIG. 4D, indicate the position of the top of the head of the bolt by a two-dot chain line.
[0018]
　The surface side of the disc plate portion 10a, the edge of the opening of the through hole 12, the inclined surface 12x is provided than the radius direction of the disc plate portion 10a extends greatly in the circumferential direction of the disc plate 10a. More specifically, the inclined surface 12x is provided in the edge of the opening of the through hole 12, the more toward the back side from a position close to the surface 10f of the disc plate portion 10a, closer to the central axis of the through-holes 12 We are inclined in the direction. The inclined surface 12x than the radial direction of the disc plate portion 10a extends greatly in the circumferential direction of the disc plate portion 10a, in other words, indicating the following form. That is, when viewed in the axial direction of the disc plate portion 10a, a range overlapped with the straight line and the inclined surface 12x extending in the circumferential direction of the center 12c of the street disc plate portion 10a of the opening of the through hole 12, opening of the through hole 12 it is larger form than the range overlapping the center 12c and a straight line extending in the radial direction of the street the disc plate portion 10a and the inclined surface 12x parts. Viewed in the axial direction of the disc plate portion 10a, a range overlapped with the straight line extending in the radial direction as the inclined surface 12x of the center 12c of the street disc plate portion 10a of the opening of the through hole 12, may be zero.
[0019]
　Inclined surface 12x is, 3B, 3C, as shown in FIG. 3D, a chamfered portion formed on the edge of the opening of the through hole 12, a R-plane. Further, the inclined surface 12x is, 4B, 4C, as shown in FIG. 4D, it may be a C-plane.
　Incidentally, the inclined surface 12x may be a one formed by chamfering such cutting, or may be formed by molding. In this specification, even if the inclined surface 12x is formed by the mold forming, chamfer the inclined surface 12x, also referred to as R-plane or C plane. Hereinafter, the R-plane or C plane of X mm, Fig. 3B, as shown in FIG. 4B, a maximum portion L1 of the length in the direction along the surface 10f of the disc plate portion 10a, in the axial direction of the disc plate portion 10a the maximum section length L2 of along is meant R plane or C plane is approximately X mm.
[0020]
　In the second example of the first embodiment and FIGS. 4A ~ D of Figure 3A ~ D, sloping surface 12x is the largest site from the center 12c of the opening in the circumferential position of the disc plate portion 10a, the center of the opening successively smaller over from 12c to a site on the radial position of the disc plate 10a. At the edge of the opening, the portion from the center 12c of the opening in the radial position of the disc plate portion 10a, inclined surface 12x is not formed.
[0021]
　FIGS. 5A-FIG. 5E is a plan view showing a third example to seventh example of the through hole for inserting a bolt.
　Inclined surface 12x of the through-hole 12 may be modified as shown in FIG. 5A ~ FIG 5E. The diameter of the large diameter portion 12w of the through-hole 12 in FIG. 5A ~ FIG 5E is 36 mm.
　Through-holes 12 of the third example, as shown in FIG. 5A, a through hole 12 is smaller than the inclined surface 12x of the first example or the second example. Largest portion of the inclined surface 12x of the third example, is provided from the center 12c of the opening in the circumferential position of the disc plate portion 10a, it is R plane or C plane of 6 mm. In the through hole 12 of the third example, the radial portion of the disc plate portion 10a from the center 12c of the opening, the inclined surface 12x is not formed. Inclined surface 12x is formed so as to continuously decreases toward the smallest part from the maximum site.
[0022]
　Through-holes 12 of the fourth example, as shown in FIG. 5B, it has a first example or the through-hole 12 is larger than the inclined surface 12x of the second example. Largest portion of the inclined surface 12x of the fourth example, provided from the center 12c of the opening in the circumferential position of the disc plate portion 10a, a R-plane or C plane of 24 mm. In the through hole 12 of the fourth example, the radial portion of the disc plate portion 10a from the center 12c of the opening, the inclined surface 12x is not formed. Inclined surface 12x is formed so as to continuously decreases toward the smallest part from the maximum site. The 24mm R-plane or C plane is sized to R plane or C plane reaches the position of the top of the head of the bolt.
　Fifth example through holes 12 of, as shown in FIG. 5C, the maximum site and the position of the minimum portion of the inclined surface 12x, an example in which rotated about the central axis of the opening, other forms, the first form of the inclined surface 12x of 1 to fourth examples is employed. In this case, the largest portion of the inclined surface 12x is a through hole 12 within the range e1 ~ e3 that equally spaced three portions in a radial direction of the disc plate portion 10a, may be located in the center of the range e2.
[0023]
　Through-holes 12 of the sixth example, as shown in FIG. 5D, a form of the inclined surface 12x of symmetrical form in the circumferential direction of the straight line passing through the center 12c of the opening, which was changed to the asymmetrical form, other forms, embodiments of the first to fourth examples is employed. In this case, the maximum site of the inclined surface 12x is a through hole 12 within the range e1 ~ e3 that equally spaced three portions in a radial direction of the disc plate portion 10a, may be located in the center of the range e2.
　Through-holes 12 of the seventh example, as shown in FIG. 5E, the inclined surface 12x is an example that is provided on the entire circumference of the opening. In a seventh embodiment, the maximum portions of the inclined surface 12x is provided from the center 12c of the opening in the circumferential position of the disc plate 10a. The minimum portion of the inclined surface 12x is provided from the center 12c of the opening in the radial position of the disc plate 10a. Inclined surface 12x is formed from the maximum of the site as toward the smallest portion continuously becomes small, the smallest portion of the inclined surface 12x is may be less than the R-plane or C plane 2 mm. Incidentally, in the form of the inclined surface 12x of the seventh example may be applied to deform as shown in the fifth example or sixth example.
[0024]
　According the first example described above in the through hole 12 of the seventh example, the edge of the opening, has an inclined surface 12x than the radial direction of the disc plate portion 10a extends greatly in the circumferential direction of the disc plate 10a. Thus, turbulence caused by the opening of the through-hole 12 is suppressed, thereby reducing the noise generated by the opening. In general, among the entire circumference of the edge of the opening, a portion facing the direction orthogonal to the rotating direction of the brake disk 10 is likely to occur noise liable disturbed airflow, the rotational direction parallel direction There site is less likely to occur is noise since it is difficult disturbed airflow. Therefore, the form of the inclined surface 12x, without wastefully reducing the contact area between the disc plate portion 10a and the sliding contact member can efficiently reduce the noise. Thus, while suppressing the braking capability of the brake disc 10 is lowered, it is possible to reduce noise generated from the brake disk 10 during traveling of the railway vehicle.
[0025]
　
　FIG. 6 is a frequency characteristic graph showing the results of noise tests. Figure 7 is a bar graph showing the results of a noise test. These graphs show the noise level when the form of the opening portion of the through hole 12 rotates the plurality of kinds of brake disc 10 differ. The term "R24", shows the configuration of the inclined surface 12x of FIG. 5B maximum site is the R plane of 24mm is formed in the opening of the through hole 12. The "C24" indicates a structure in which the inclined surface 12x of FIG. 5B maximum site is a C-plane of 24mm was formed. The term "R6", shows the configuration of the inclined surface 12x of Figure 5A maximum site is the R plane of 6mm is formed. The "C6", shows the configuration of the inclined surface 12x of Figure 5A maximum site is a C-plane of 6mm is formed. "No chamfering" shows the configuration has no inclined opening surface side of the through-hole 12, "entire circumference C2" is C face of 2mm on the entire edge of the opening on the surface side of the through holes 12 It shows a formed configuration. The vertical axis of FIG. 6 shows the noise level of each frequency band, the horizontal axis of FIG. 6 shows the center frequency of the third octave band. FIG 7 shows the peak noise level, the overall noise level of the primary frequency range of the noise through hole causes (1250Hz ~ 5000Hz).
[0026]
　As shown in FIG. 6, according to the brake disk 10 of the present embodiment having an inclined surface 12x of R24 or C24, compared configuration without chamfer, or the brake disc where the configuration of the entire circumference C2, 2500 Hz peripheral it was confirmed that the noise level of significantly reduced. Similarly, according to the brake disk 10 of the present embodiment having an inclined surface 12x of R6 or C6, it was confirmed that the noise level of around 2500Hz is more significantly reduced.
[0027]
　Further, as shown in FIG. 7, according to the brake disk 10 of the present embodiment having an inclined surface 12x of R24 or C24, configuration without chamfering, or compared to the brake disc where the configuration of the entire circumference C2, it was confirmed that the peak noise level is remarkably reduced. Further, according to the brake disk 10 of the present embodiment having an inclined surface 12x of R6 or C6, configuration without chamfering, or compared to the brake disc where the configuration of the entire circumference C2, a peak noise level through hole It causes and the primary frequency range of the noise level of the noise made it was confirmed to be significantly reduced.
[0028]
　Figure 8 is a graph showing the relationship between the size and the peak noise level of the inclined surface.
　Noise generated by the opening of the through hole 12, of the total circumference of the opening, is presumed that the noise generated at the edges perpendicular to the direction of rotation of the brake disc 10 becomes dominant. Therefore, the size of the inclined surface 12x in this site is presumed to be correlated to the noise level. The size of the inclined surface of this site is zero in the configuration of "no chamfering", 2 mm in the configuration of the "entire circumference C2", 6 mm in the configuration of the "R6" and "C6", and "R24" in the construction of "C24" is it is a 24mm.
　Based on such guess, when calculating the correlation between the size and the peak noise level of the inclined surface 12x, the approximate curve shown in FIG. 8 is determined. According to this approximation curve, the size of the inclined surface by a 4mm or more and 24mm or less, is presumed to peak noise level is remarkably reduced. Further, by making the size of the inclined surface to 5mm or more and 20mm or less, is presumed to peak noise level is more significantly reduced.
[0029]
　Have been described embodiments of the present invention. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, the inclined surface 12x, as shown in an example the length L1 and the length L2 is equal R plane or C plane shown in FIG. 3B and 4B. However, the inclined surface 12x may be a length L1 is a length L2 greater than the inclined surfaces, the length L1 may be a length L2 smaller than the inclined surface. Other details shown in the embodiments may be suitably changed without departing from the spirit of the invention.
Industrial Applicability
[0030]
　The present invention is applicable to a brake disk for rail vehicles.
DESCRIPTION OF SYMBOLS
[0031]
　10 the brake disc
　10a, a disk plate portion
　10f surface
　12 through holes
　12t small diameter portion
　12w large diameter portion
　12x inclined surface
　center of 12c opening

WE CLAIM

A disc plate portion having a sliding portion on the surface,
　penetrating from the front surface to the back surface of the disc plate portion, and a through hole bolt for fastening the wheels of the disc plate portion and the railway vehicle is passed,
　the edge of the opening of the through hole on the surface side of the disc plate portion includes a feature that the inclined surfaces extending largely in the circumferential direction of the disc plate portion than the radius direction of the disc plate portion is provided railway vehicle brake disk that you want to.
[Requested item 2]
　For a railway vehicle according to claim 1, wherein the site in the circumferential positions of the disk plate from the center of the opening of the inclined surface is C face or R face of 4mm or more and 24mm or less brake disc.
[Requested item 3]
　Brake for a railway vehicle according to claim 1, wherein a portion from the center of the opening in the circumferential position of the disc plate portion is C face or R face of 6 mm ± 15% of said inclined surface disk.
[Requested item 4]
　Or no inclined surface is at a site on the radial position of the disk plate from the center of the opening of the opening, that the inclined surface is provided which is less C plane or R plane 2mm railway vehicle brake disc according to any one of claims 1 to 3, characterized.