JP2846218B2 - Sound insulation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulating device, and more particularly, to a sound insulating device suitable for a current collector provided in a railway car running at high speed.

[0002]

2. Description of the Related Art Noise generated from a current collector of a vehicle includes a spark noise, a sliding noise, an aerodynamic noise, and the like, which are highly dependent on speed. It has been found that it increases by the 6th to 9th power rule. Conventionally, as a device for reducing noise from a current collector comprising a pipe and a rod-shaped member, for example, Japanese Patent Application Laid-Open No.
As described in Japanese Patent No. 4667, there is known a structure in which a sound insulation is provided by extending a top surface of a vehicle body to a maximum height position within a vehicle limit, providing side walls on both sides of a current collector, and providing front and rear walls. Have been. Further, it is known that the lift value of the hull of the current collector increases according to a substantially square law of the traveling speed. It is known that the flow velocity at the body position is reduced to reduce the lift value of the boat body.

[0003]

According to the above prior art, the sound generated from the current collector is shielded, and the front and rear walls have a sufficient height with respect to the maximum height of the current collector. By optimizing the inclination angles of the front surfaces of the front and rear walls, the average flow velocity of the airflow hitting the current collector is reduced, and the aerodynamic noise and the lift value generated in the hull of the current collector are reduced. However, in order to increase the separation of the airflow at the upper ends of the front and rear walls on the front side in the traveling direction of the vehicle and to reduce the average flow velocity of the airflow hitting the current collector, the front and rear walls of the sound insulation device are increased, and It is necessary to increase the inclination angle of the front surfaces of the front and rear walls. For this reason, contrary to the effect of reducing the average flow velocity in the current collector unit, the surface area and the projected area of the sound insulation device itself increase, and further, the separation area increases due to the increase in the inclination angle of the front and rear walls. An increase in aerodynamic noise and aerodynamic drag is expected.

An object of the present invention is to reduce the aerodynamic noise and lift value of the current collector by reducing the average flow velocity of the airflow at the position of the hull of the current collector, and to reduce the aerodynamic noise and noise of the sound isolator itself. An object of the present invention is to provide a sound insulation device capable of suppressing air resistance.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a power collector having front and rear walls disposed at front and rear portions in the longitudinal direction of a vehicle body, side walls disposed at both sides in the vehicle width direction of the power collector, and a lower portion of the power collector. The front and rear walls, the side walls and the bottom plate are separated from the upper surface of the body roof by a support member provided on the upper surface of the body roof and disposed above the vehicle body roof, and the lower surface of the bottom plate is formed as a downwardly convex curved surface. It is achieved by doing.

[0006]

The sound insulation device main body is separated from the vehicle roof upper surface by a support member provided on the vehicle body roof upper surface, and further,
By forming the lower surface of the bottom plate of the sound insulation device into a downwardly convex curved surface, the height dimension of the front and rear walls is sufficiently secured to achieve a sufficient peeling effect, and the projected area of the sound insulation device itself in the longitudinal direction of the vehicle body. Can be made smaller than that having a conventional flat bottom plate. Therefore, the aerodynamic noise and the lift value generated from the current collector can be reduced, and the air resistance can be reduced by reducing the projected area in the longitudinal direction of the vehicle body.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1, 4, 5 and 6 show a first embodiment in which the cabin area is made large and the distance between the upper surface of the vehicle body roof and the upper surface of the current collector is made relatively small. In the figure, reference numeral 1 denotes a vehicle body provided with a current collector and a sound insulation device described below, and 2 denotes a boat body 3, an upper frame, a lower frame, and a hood.
This is a current collecting device including a housing 4 and an insulator 5. Reference numeral 6 denotes a sound insulation device including front and rear walls 7, side walls 8, and a bottom plate 9. The front and rear walls 7 include an outer wall 7o formed as a concave curved surface having a slope rising forward toward the current collector 2, and an inner wall 7i formed as a slope downwardly forward toward the current collector 2. As shown in FIG. 4, the side wall 8 has an outer peripheral surface which is curved outwardly in the longitudinal direction of the vehicle body, and which is also curved outwardly in the vertical direction as shown in FIG. As shown in FIG. 6, the bottom plate 9 has a lower surface formed into a downwardly curved surface in a cross section in the vehicle width direction. The bottom plate 9 has horns 4 provided at both ends of the current collector 2 when the current collector 2 is stored.
Opening 11 that can secure an electrical insulation distance to the tip of
Is provided. The sound insulation device 6 is supported at a predetermined distance above the roof of the vehicle body by a support member 10 provided on the vehicle body 1.

According to such a configuration, the airflow flows between the airflow A flowing along the inclined surface of the outer wall 7 o of the upstream front and rear walls 7 and the lower surface of the bottom plate 9 of the sound insulating device 6 and the upper surface of the roof of the vehicle body 1. The air is diverted into the air flow B. At this time, the sound insulation device 6 is separated from the upper surface of the vehicle body roof by the support member 10 and is held at a predetermined distance, and the lower surface of the bottom plate 9 is formed as a curved surface that is convex downward in the cross section in the vehicle width direction. Therefore, the area of the sound insulation device 6 in the cross section in the vehicle body width direction, that is, the projected area in the vehicle body longitudinal direction can be made smaller than that of the conventional sound insulation device in which the width from the top surface of the vehicle body to the predetermined height is substantially the same. Further, even when the distance between the upper surface of the boat body 3 of the current collector 2 and the upper surface of the vehicle body roof is relatively short, the height dimension of the front and rear walls 7 can be sufficiently ensured. Further, since there is a large gap between the upper surface of the vehicle body roof and the bottom plate 9, the airflow B smoothly flows rearward, and the stagnation of the airflow does not occur near the lower front of the front and rear walls 7. Therefore, the air flow A is more strongly deflected upward along the entire length of the inclined surface of the front and rear walls 7, and as a result, the average flow velocity at the position of the boat 3 of the current collector 2 can be reduced. As a result, it is possible to reduce the aerodynamic noise and the lift value from the current collector 2 due to the increase in the vehicle body longitudinal speed, and to suppress an increase in the running resistance of the vehicle.
Further, by supporting the sound insulating device 6 away from the roof top surface of the vehicle body 1, there is no stagnation portion which conventionally slows down the flow velocity, and a large gap is provided between the vehicle body roof upper surface and the bottom plate 9. Therefore, the flow velocity difference between the air flow B and the air flow C flowing above the sound insulation device 6 can be reduced, and the lift acting on the sound insulation device 6 itself, which is caused by the flow velocity difference, can be reduced. Here, when the distance between the upper surface of the current collector 2 and the upper surface of the vehicle body roof is relatively short, the lower surface of the bottom plate 9 of the sound insulating device 6 is formed to have a downwardly convex curved surface, so that the current collector 2 It is difficult to secure an electrical insulation distance at the tip of the horn 4 when it is stored.
By providing an opening 11 large enough to secure an electrical insulation distance at a position corresponding to the lower part of the tip of the horn 4 when the current collector 2 is stored, the electricity at the tip of the horn 4 when the current collector 2 is stored is provided. Insulation gap can be secured.

As shown in FIG. 2, the outer wall 7o is a concave curve having an inclined surface which rises forward toward the current collector 2 on the longitudinally cut surface of the inclined surface of the front and rear walls 7 of the sound insulating device 6 shown in FIG.
The inner wall 7i is formed on an inclined surface that falls forward toward the current collector 2. According to the front and rear walls 7 having such a configuration, the outer wall 7o having the concave curved surface causes the airflow to be more strongly deflected upward, and as a result, the separation area of the airflow C from the upper end of the front and rear walls 7 is increased. In addition, the position of the main flow can be deviated upward, and the average flow velocity of the airflow at the position of the boat 3 of the current collector 2 can be reduced. Further, a small radius arc 7t is formed at the upper intersection of the outer wall 7o and the inner wall 7i on the longitudinally cut surface of the front and rear walls 7 in the longitudinal direction of the vehicle body. The generation of the vortex a can be suppressed, and the aerodynamic noise of a relatively high frequency generated from the upper end of the front and rear wall 7 can be reduced. Further, since the bottom plate 9 is a curved surface that is convex downward and has an arc shape, the front and rear walls 7 have a shape such that the contact area of the airflow decreases as the distance from the front and rear walls 7 increases in the vehicle width direction. Therefore, the flow velocity of the main flow M that is deflected upward along the front and rear walls 7 decreases as the main flow M moves away in the vehicle width direction. Due to this flow velocity difference, a vertical vortex b rotating around the longitudinal direction of the vehicle body is generated in a form as shown in FIG. 3 to inhibit the growth of the horizontal vortex a and reduce the generation of aerodynamic noise at a relatively low frequency. I do. The air flow A strongly deflected upward by the front and rear walls 7 has a velocity distribution that changes rapidly in the vertical direction, but a relatively large horizontal vortex c is generated by this velocity gradient. The space surrounded by the front and rear walls 7 and the side wall 8 of the sound insulating device 6 is negatively pressured by these lateral vortices c, and this action generates a entangled flow d from the outside of the side wall 8. Is formed on a curved surface that protrudes outward and is a curved surface along the entrained flow d, so the flow in this area is smooth and does not generate extra vortex, and suppresses the generation of aerodynamic noise in this part can do. In addition, since the outer peripheral surface of the side wall 8 constituting the sound insulating device 6 is formed as a curved surface protruding outward in the longitudinal direction of the vehicle body, the air flow around the side wall 8 when the sound insulating device 6 is lowered from above. D can be closer to the airfoil flow. As a result, it is possible to suppress an increase in the backflow region due to the separation of the airflow generated at the end of the side wall 8 and to suppress an increase in the air resistance of the sound insulating device 6 due to an increase in the vehicle traveling speed. A vortex due to separation generated at the trailing end of the wake and aerodynamic noise generated thereby can be suppressed.

Next, FIG. 7 is a perspective view, FIG. 8 is a plan view, FIG. 9 is a front view, and FIG. 10 is a side view of the second embodiment. The same reference numerals as those in the first embodiment denote the same members. In each of the drawings, the difference between the present embodiment and the first embodiment is that the front and rear walls 27 and the side walls 28 constituting the sound insulating device 26 are different.
Is simplified in shape so that the upper end lines are at the same level. In the present embodiment, similarly to the above embodiment, in the sound insulation device 26 including the front and rear walls 27, the side walls 28, and the bottom plate 29,
The front and rear walls 27 have an outer wall 27o formed as a concave curved surface having an inclined surface rising forward toward the current collector 2, and an inner wall 27i formed as an inclined surface falling forward toward the current collector 2.
Consists of As shown in FIG. 8, the side wall 28 has an outer peripheral surface formed into a curved surface convex outward in the longitudinal direction of the vehicle body, and also formed into a curved surface convex outward in the vertical direction as shown in FIG. As shown in FIG. 10, the bottom plate 29 has a lower surface formed as a curved surface that is convex downward in a cross section in the vehicle width direction. The bottom plate 29 is provided with an opening 31 for securing an electrical insulation distance with respect to the tips of the horns 4 provided at both ends of the current collector 2 when the current collector 2 is stored. Have been. The sound insulation device 26 is installed at a predetermined distance from the upper surface of the vehicle body roof by a support member 30 provided on the upper surface of the vehicle body roof.

According to the above configuration, the same effect as that of the above embodiment can be achieved, and the upper end of the sound insulating device 26 is at the same level and the shape is simplified as a whole. In the case of resin molding, etc., the cost can be reduced.

FIG. 11 is a perspective view, FIG. 12 is a plan view, FIG. 13 is a front view, and FIG. 14 is a side view of the third embodiment.
This embodiment is an embodiment in which the cross section of the vehicle body is reduced in size and the distance between the upper surface of the vehicle body roof and the upper surface of the current collector 2 is relatively large in the first embodiment. The same reference numerals as those in the above-described embodiment indicate the same members. In this embodiment, as in the first embodiment, the sound insulation device 46 including the front and rear walls 47, the side walls 48, and the bottom plate 49 is separated from the upper surface of the vehicle body roof by a support member 50 provided on the upper surface of the vehicle body roof and arranged upward. It was done. The difference between this embodiment and the first embodiment is that in this embodiment, the distance between the upper surface of the vehicle body roof and the upper surface of the current collector 2 is relatively large.
An electrical insulating gap at the tip of the horn 4 when the current collector 2 is stored can be secured without providing an opening at a position corresponding to the lower end of the horn 4 when the horn 4 is stored.

According to such a configuration, the height of the support member 50 can be increased even when the distance between the upper surface of the vehicle body roof and the upper surface of the hull 3 of the current collector 2 increases due to the reduction in the cross section of the vehicle body. By simply increasing the height, the height of the front and rear walls 47 can be sufficiently secured without increasing the height of the sound insulation device 46 itself. As a result, it is possible to minimize an increase in the area of the sound insulation device 46 in the cross section in the vehicle body width direction, that is, the projection area of the sound insulation device 46 in the vehicle body longitudinal direction. As a result, the same effects as those of the first and second embodiments can be obtained, and an increase in running resistance due to an increase in vehicle running speed can be suppressed.

FIG. 15 is a perspective view, FIG. 16 is a plan view, FIG. 17 is a front view, and FIG. 18 is a side view of the fourth embodiment. The same reference numerals as those in the first embodiment denote the same members. In this embodiment, the shape is simplified so that the upper end lines of the front and rear walls 67 and the side walls 68 constituting the sound insulation device 66 are at the same level as in the second embodiment with respect to the first embodiment.

According to the above construction, the same effect as that of the above embodiment can be achieved, and the upper end of the sound insulation device 26 is at the same level and the shape is simplified as a whole. In the case of resin molding, etc., the cost can be reduced.

[0016]

As described above, the present invention reduces the aerodynamic noise and lift value from the current collector hull by reducing the average flow velocity at the position of the current collector hull, and generates the noise from the sound isolator itself. Aerodynamic noise and air resistance can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sound insulation device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of front and rear walls of the sound insulating device shown in FIG. 1;

FIG. 3 is a schematic diagram of a vortex generated above the sound insulating device according to the first embodiment of the present invention.

FIG. 4 is a plan view of the sound insulation device of FIG. 1;

FIG. 5 is a front view of the sound insulating device of FIG. 1;

FIG. 6 is a side view of the sound insulation device of FIG. 1;

FIG. 7 is a perspective view of a sound insulation device according to a second embodiment of the present invention.

FIG. 8 is a plan view of the sound insulation device of FIG. 7;

FIG. 9 is a front view of the sound insulation device of FIG. 7;

FIG. 10 is a side view of the sound insulation device of FIG. 7;

FIG. 11 is a perspective view of a sound insulation device according to a third embodiment of the present invention.

FIG. 12 is a plan view of the sound insulating device of FIG. 11;

FIG. 13 is a front view of the sound insulation device of FIG. 11;

FIG. 14 is a side view of the sound insulation device of FIG. 11;

FIG. 15 is a perspective view of a sound insulation device according to a fourth embodiment of the present invention.

FIG. 16 is a plan view of the sound insulating device of FIG.

FIG. 17 is a front view of the sound insulation device of FIG.

FIG. 18 is a side view of the sound insulation device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Current collecting device, 3 ... Boat body, 4 ... Horn, 5 ...
Insulator, 6: sound insulation device, 7: front and rear wall, 8: side wall, 9: bottom plate, 10: support member, 11: opening.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Morinari Hattori 794, Higashi-Toyoi, Kazamatsu-shi, Yamaguchi Prefecture Hitachi, Ltd. Inside the Kasado Plant (72) Inventor Jin Tsuruta 794, Higashi-Toyoi, Kudamatsu-shi, Yamaguchi Inside the Kasado Plant (72) Katsuyuki Terada, Inventor Katsumatsu City, Yamaguchi Prefecture 794, Higashi-Toyoi, Hitachi, Japan Inside Hitachi Kasado Engineering Co., Ltd. (72) Inventor Kiyoshi Okada 1-1-4 Meieki, Nakamura-ku, Nagoya-shi, Aichi Passenger Railway Co., Ltd. (72) Inventor Kazumasa Ishizu 1-1-4 Meiji Station, Nakamura-ku, Nagoya City, Aichi Prefecture Tokai Passenger Railway Co., Ltd. (72) Inventor Masatoshi Ito, Nakamura-ku, Nagoya City, Aichi Prefecture No. 1-4, Tokai Passenger Railway Co., Ltd. (56) References JP-A-5-4581 (JP, A) JP-A-6-205504 (JP) , A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G10K 11/16 B60L 5/24 B61D 49/00 ZAB

Claims (5)

(57) [Claims] 1. A power collection device comprising: front and rear walls arranged at front and rear portions in a longitudinal direction of a vehicle body; side walls arranged at both sides in a vehicle width direction of the current collection device; and a bottom plate provided below the current collection device.
The front and rear walls are supported by support members provided on the upper surface of the vehicle body roof.
A sound insulation device wherein a side wall and a bottom plate are separated from an upper surface of a vehicle body roof and arranged above the vehicle body roof, and the lower surface of the bottom plate is formed as a downwardly convex curved surface in a cross section in the vehicle width direction. 2. The sound insulation device according to claim 1, wherein said current collector has horns at both ends in a vehicle width direction, and said hood of said bottom plate is stored when said current collector is stored. A sound insulation device provided with an opening at a position corresponding to a lower portion of the front end of the horn so that an insulation distance at the front end of the horn can be secured. 3. The sound insulation device according to claim 1, wherein the outer peripheral surface of the side wall is formed as a curved surface that is outwardly convex in the longitudinal direction of the vehicle body. 4. The sound insulation device according to claim 1, wherein the outer peripheral surface of the side wall is formed as a curved surface that is outwardly convex in a vertical direction. 5. The sound insulation device according to claim 1, wherein the outer walls of the front and rear walls are concave curved surfaces having inclined surfaces rising upward toward the current collector, and the inner walls of the front and rear walls are connected to the current collector. A sound insulation device characterized by an inclined surface falling forward.