JP3741769B2 - Brake equipment for railway vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a brake device for a railway vehicle, and more particularly to an improvement in brake cooling and wear resistance.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 4-54329 discloses a disc brake device for a railway vehicle in which cooling air is introduced from the center of a rotating shaft in order to prevent a temperature rise due to frictional heat between a rotor and a stator during braking. Proposed by the publication.
[0003]
This has a shaft hole in the center of the rotating shaft, branches and opens from the middle toward the outer periphery of the shaft, releases the air taken in from the shaft hole to the outer periphery of the shaft using the centrifugal force of rotation, and attaches to the shaft The rotor and the stator pressed against it during braking are cooled.
[0004]
The rotating shaft is connected to the motor shaft through a coupling, and the frictional heat between the rotor and the stator is transmitted from the rotating shaft to the motor shaft. Secure.
[0005]
[Problems to be solved by the invention]
However, even if a shaft hole is provided in the center of the rotating shaft in this way and the outside air is taken in by centrifugal force, the passage of air is merely opened toward the outer periphery of the shaft because of the passage of air from the shaft hole. The cooling efficiency was low.
[0006]
In addition, the stationary stator can move freely in the axial direction with respect to the rotor that is always rotating, so that it may come into contact with the rotor, and wear occurs other than during braking. There was also a problem.
[0007]
The present invention aims to solve such problems.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, there are provided a plurality of rotors coupled to a rotating shaft supported by a housing via bearings via a spline portion, a stator sandwiched between the rotors and supported on the housing side, and a rotor during braking In a railway vehicle brake device comprising a pressing piston that presses a stator against a bearing, a compressed air introduction duct that opens to a housing in the vicinity of the periphery of the bearing of the rotary shaft, and an intake port on a side surface of the boss portion of the rotary shaft An air guide passage formed in the rotary shaft so as to send the compressed air to the spline portion, and an inclined groove formed so as to gradually become shallower in the axial direction at the groove bottom of the spline portion communicating with the air guide passage, ejection passage formed in the rotor so as to guide the rotor side of air fed from the air guide passage to the inclined groove incorporates a splined portion of the inner periphery of the rotor , And an air discharge duct which opens into the housing and positioned on the outer peripheral portion of the rotor and the stator, wherein the inclined groove is opened along the groove bottom of the spline portion, the wind guide path axis relative to the inclined groove It opened to the deepest part in the center of the direction .
[0009]
According to a second invention, in the first invention, there is provided a guide plate for guiding the air fed from the introduction duct into the housing toward the introduction port of the rotating shaft.
[0010]
According to a third invention, in the first or second invention, the introduction duct is provided in a pair so as to open to the housing at both ends of the rotation shaft, and the introduction port of the air guide passage is a boss portion Provided on both sides.
[0011]
In a fourth aspect based on the first to third aspects, the ejection passage formed in the rotor includes a plurality of ejection openings that are open on both side surfaces of the rotor.
[0012]
[Action]
In the first invention, the compressed air pumped from the introduction duct to the vicinity of the rotating shaft of the housing flows into the air guide passage opening in the side surface of the boss portion, and receives the centrifugal force due to the rotation of the rotating shaft, while the boss portion It spouts to the spline part of the outer periphery, and further part flows into a spout passage that opens to the inner peripheral surface of the rotor, where it is accelerated by centrifugal force and spouts from the rotor side surface toward the surface facing the stator.
[0013]
This forcibly cools the rotating shaft, rotor, and stator, and the air blown to the opposing surface of the rotor and stator keeps the distance between the rotor and stator during non-braking to prevent unnecessary contact. To reduce wear.
[0014]
In the second aspect of the invention, the compressed air from the introduction duct is directed to the introduction port that opens to the side surface of the rotating shaft boss portion by the guide plate, so that the main flow of the cooling air efficiently flows into the air guide passage. be able to.
[0015]
In the third aspect of the invention, the air guide passages are on both sides of the boss portion, and the compressed air introduction ducts are arranged on both outer sides thereof, so that the cooling air can be efficiently taken into the air guide passage.
[0016]
In the fourth aspect of the invention, since the ejection passage formed in the rotor ejects air to the surface facing the stator through the plurality of ejection ports, the gap between the rotor and the stator can be reliably maintained.
[0017]
Embodiment
1 to 6 show an embodiment of the present invention.
[0018]
1 to 3, the motor shaft of the motor is connected to a rotating shaft 5 of the disc brake device 4 via a coupling 3 while being connected to a wheel (not shown) via a reduction gear device.
[0019]
The housing 6 of the disc brake device 4 is coupled to a vehicle body (not shown) via a support member 7, and the rotating shaft 5 is rotatably supported by the housing 6 via left and right bearings 8. A boss portion 9 having an enlarged diameter is formed at the central portion of the rotating shaft 5, and a plurality of disk-like rotors 10 are engaged with the outer periphery of the boss portion 9 via spline portions 13 on the inner periphery. 5 and rotate together.
[0020]
A plurality of hollow disk-shaped stators 11 whose outer peripheral portions are supported are disposed on the housing 6 side so as to be sandwiched between the rotors 10, and disposed on the side wall 6 a of the housing 6 on one side surface of the stator 11. The rotation of the rotor 10 is braked by sandwiching the stator 11 and the rotor 10 between the formed piston 12 and the receiving portion 15 disposed on the other side surface.
[0021]
The stator 11 is allowed to move in the axial direction by a key 14 provided on the inner periphery of the housing 6 but cannot rotate.
[0022]
The hydraulic pressure is applied to the piston 12 via the pipe 20 during braking, whereby the piston 12 is pushed out. When the hydraulic pressure is released, the piston 12 is pushed back by a return spring (not shown).
[0023]
A plurality of air inlets 21 for taking in cooling compressed air to be pumped into the housing are opened at equal intervals on the same circumference on both side surfaces of the boss portion 9 whose diameter has been enlarged on the rotating shaft 5. Each air inlet 21 is inclined in the outer peripheral direction from the outside toward the center, and communicates with an air reservoir 22 formed at the center of the rotating shaft 5.
[0024]
A plurality of passages 23 are formed radially from the air reservoir 22 toward the outer periphery, and the passages 23 open to an inclined groove 24 formed in the groove bottom 13a of the spline portion 13, thereby providing an air guide passage for cooling air. 25 is configured. The inclined groove 24 is formed so as to be deepest in the central portion in the axial direction and gradually shallower from left to right and guide air to both ends of the boss portion 9 along the spline portion 13.
[0025]
As shown in FIGS. 4 to 6, the rotor 10 has inlets 35 that open on the spline surface on the inner periphery, extend radially from the inlet 34, and branch toward both side surfaces of the rotor 10. The air jet passage 36 is provided, and the air taken in from the inclined groove 24 of the spline portion 13 is jetted toward the surface facing the stator 11, and a gap is maintained between the rotor 10 and the stator 11 to freely rotate. The contact between the inner rotor 10 and the stator 11 is reduced to reduce wear.
[0026]
As shown in FIG. 7, when the ejection passage 36 includes ejection ports 35 a that are opened at a plurality of locations on both surfaces of the rotor 10, air can be evenly ejected onto the surface facing the stator 11.
[0027]
On the other hand, air intake ports 29 are provided on the side walls 6a on both sides of the housing 6 so as to be located outside the bearing 8, and compressed air from a compressed air source (not shown) is provided outside the intake ports 29. The introduction ducts 41a and 41b introduced into the housing are connected.
[0028]
Further, an annular guide plate 30 is provided on the inner side of the housing 6 near the outer periphery of the intake port 29, and compressed air introduced into the housing 6 through the intake port 29 is supplied to both sides of the boss portion 9. Guidance is directed toward the air inlet 21 on the surface.
[0029]
On the other hand, an air exhaust duct 42 is connected to the housing 6 at an outer peripheral portion of the rotor 10 and the stator 11, and collects air cooled in the housing through an exhaust port (not shown) provided in the housing 6. Discharge.
[0030]
A ring-shaped heat shield 32 is disposed inside the housing 6 from the inner periphery to the outer periphery of the bearing 8 to block radiant heat from the high-temperature rotor 10 and the stator 11 toward the bearing 8.
[0031]
Further, a shaft hole 26 penetrating to the outside is provided in the shaft center of the rotating shaft 5, and a rotary joint for taking out the wiring of a sensor (not shown) for detecting the temperature inside the rotating shaft 5 at this end portion. 27 is provided. As described above, when the temperature sensor is attached to the shaft hole 26 through which the cooling air does not pass, the influence of the cooling air is eliminated and the temperature of the rotating shaft can be accurately measured.
[0032]
It is comprised as mentioned above, Next, an effect | action is demonstrated.
[0033]
Compressed air is introduced from the outside air introduction ducts 41 a and 41 b into the housing 6 through the intake port 29. The main flow of the pumped air flows toward the inlets 21 having openings 29 around the bearing 8 and opening on both side surfaces of the boss portion 9 of the rotating shaft 5 by the action of the guide plate 30. It flows from the mouth 21 into the boss 9.
[0034]
The air that has flowed into the air guide passage 25 from the introduction port 21 due to the rotation of the rotating shaft 5 receives a rotational centrifugal force, and is inclined while being pressurized outwardly by the passage 23 extending in the radial direction from the air reservoir 22. It flows out into the groove 24.
[0035]
Further, the air flows to the left and right along the inclined groove 24. At this time, the air flowing into the inner periphery of the rotor 10 is inclined to the left and right from the center, and maintains a certain distance from the inner peripheral surface of the rotor 10. It is easy to flow from side to side.
[0036]
In this way, the rotation shaft 5 is efficiently cooled by penetrating the inside of the rotation shaft 5 and further flowing air along the outer periphery thereof.
[0037]
A part of the air enters the interior of the rotor 10 through the inlet 34 opened on the spline surface on the inner periphery of the rotor 10 and is accelerated while receiving centrifugal force in the air ejection passage 36 extending radially from the rotor 10. 10 is ejected from the injection port 35 branched toward both side surfaces toward the stator 11 and the opposing surface.
[0038]
This blown air pressure maintains a gap between the stator 11 located on both sides of the rotor 10, reduces the chance of contact between the rotor 10 and the stator 11 during free rotation other than during braking, and accompanies the contact. Reduce wear.
[0039]
Of course, the rotor 10 is cooled by the air passing through the rotor 10, and the stator 11 is also cooled by the blown air. Therefore, the temperatures of the rotor 10 and the stator 11 due to frictional heat generated during braking are used. A rise is avoided.
[0040]
Since the discharge duct 42 opens into the housing 6 near the outer periphery of the rotor 10 and the stator 11, the main flow of the cooling air flowing into the housing 6 from the introduction ducts 41a and 41b on both sides of the rotating shaft 5 is the rotating shaft. 5, and flows from the inner periphery of the rotor 10 to the outer periphery via the surface facing the stator 11, so that the rotating shaft 5, the rotor 10, and the stator 11 can be efficiently cooled, and therefore Together, these can suppress the temperature increase of the disc brake and greatly improve its heat resistance.
[0041]
Further, the flow of the cooling air in this manner can eliminate the wear powder generated due to the contact between the rotor 10 and the stator 11 during braking, and the braking characteristics are also stabilized.
[0042]
【The invention's effect】
According to the first invention, a plurality of rotors coupled to a rotating shaft supported by a housing via bearings via a spline portion, a stator sandwiched between the rotors and supported on the housing side, braking In a railway vehicle brake device, which sometimes includes a pressing piston that presses the stator against the rotor, an inlet duct for compressed air that opens to the housing in the vicinity of the periphery of the bearing of the rotary shaft, and an inlet for a side surface of the boss portion of the rotary shaft An air guide passage formed in the rotating shaft so as to send the compressed air taken in from the spline portion, and an inclined groove formed so as to gradually become shallower in the axial direction at the groove bottom of the spline portion communicating with the air guide passage. If, injection formed in the rotor so as to guide the rotor side surface incorporating air fed from the air guide passage to the inclined groove from the spline section of the inner periphery of the rotor A passage located in the outer peripheral portion of the rotor and the stator and an air exhaust duct which is open to the housing, the inclined grooves is opened along the groove bottom of the spline portion, the wind guide path to said inclined groove Since the opening is at the deepest part in the central part in the axial direction, the cooling air pumped from the introduction duct is accelerated by the rotational centrifugal force and guided from the rotating shaft to the rotor, and the rotating shaft, rotor, and stator are installed. Since cooling is forcibly performed, these cooling efficiencies are greatly improved, and the air blown to the opposing surface of the rotor and the stator maintains the distance between the rotor and the stator during non-braking, thereby preventing unnecessary contact. It can also prevent wear and reduce brake life.
[0043]
According to the second aspect of the invention, since the guide plate for guiding the air pumped from the introduction duct into the housing toward the introduction port of the rotating shaft is provided, the main flow of the cooling air is efficiently transferred to the air guide passage. Can flow in.
[0044]
According to the third invention, the introduction duct is provided in a pair so as to open to the housing at both ends of the rotation shaft, and the introduction port of the air guide passage is provided on both side surfaces of the boss portion. Cooling air can be efficiently taken into the air guide passage.
[0045]
According to the fourth aspect of the present invention, the ejection passage formed in the rotor includes the plurality of injection ports that are opened on both side surfaces of the rotor, so that the gap between the rotor and the stator can be reliably held.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a cross-sectional view of a boss portion of a rotating shaft.
FIG. 4 is a front view of a rotating shaft.
FIG. 5 is a front view of a rotor.
FIG. 6 is a cross-sectional view of a rotor.
FIG. 7 is a partial cross-sectional view showing another example of the rotor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 5 Rotating shaft 6 Housing 6a Side wall 9 Boss part 10 Rotor 11 Stator 12 Piston 13 Spline part 21 Air introduction port 25 Air guide passage 29 Intake port 30 Guide plate 35 Injection port 36 Injection passage 41a, 41b Introduction duct 42 Exhaust duct

Claims (4)

A plurality of rotors coupled to a rotating shaft supported by a housing via bearings via a spline portion, a stator sandwiched between the rotors and supported on the housing side, and a pressing piston that presses the stator against the rotor during braking A brake duct for a railway vehicle comprising: a compressed air introduction duct that opens into a housing in the vicinity of a periphery of the bearing of the rotary shaft; and a compressed air introduced from a side inlet of a boss portion of the rotary shaft. An air guide passage formed in the rotating shaft so as to be fed into the section, an inclined groove formed so as to gradually become shallower in the axial direction at the groove bottom of the spline portion communicating with the air guide passage, and the inclination from the air guide passage. and ejection passage formed in the rotor so as to guide the rotor side surface incorporating air fed into the groove from the spline section of the inner periphery of the rotor, the rotor and the scan And an air discharge duct which opens into the housing and positioned on the outer peripheral portion of the chromatography data, the inclined grooves is opened along the groove bottom of the spline portion, the air guide passage in the axial direction with respect to the inclined groove A brake device for a railway vehicle, wherein the brake device is opened at a deepest portion in a central portion .  The railway vehicle brake device according to claim 1, further comprising a guide plate that guides air fed from the introduction duct into the housing toward the introduction port of the rotating shaft.  The railway vehicle according to claim 1 or 2, wherein the introduction duct is provided in a pair so as to open to the housing at both ends of the rotation shaft, and the introduction port of the air guide passage is provided on both side surfaces of the boss portion. Brake device.  The railcar brake device according to any one of claims 1 to 3, wherein the ejection passage formed in the rotor includes a plurality of injection ports that are open on both side surfaces of the rotor.

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