JPH06189408A - Current collector shoe - Google Patents

Abstract

PURPOSE:To provide a current collecting shoe of an integral ship type which has suitable lift characteristics during traveling of a vehicle and in which whizzing noise is reduced with small drag. CONSTITUTION:A section of a shoe is formed in a shape in which trapezoidal members 10c are mounted at elliptical upper and lower surfaces. An upper surface of the shoe is necessary to be always a smooth flat surface in order to mount a slide plate 10b, and the flat surface generates a downward lift. In order to compensate the downward lift, a shape having a smooth flat surface is formed also on a lower surface of the shoe, lengths of the upper and lower flat surfaces of the shoe are altered or ends of the flat surface are rounded to regulate the lift characteristics, thereby forming the shoe 10 having suitable lift characteristics and a small drag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power collection boat device for a pantograph of a railway vehicle.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional current collector.
A mechanical view showing an example, and FIG. 7 is a schematic plan view of a current collecting boat. In FIGS. 6 and 7, 1 is a vehicle body, 2 is a support insulator, 3 is a pantograph underframe, 4 is a frame assembly, and 5 is a current collecting boat that connects two boat bodies 5a and 5b having a substantially rectangular cross section. It has a shape connected by 5c and has a sliding plate 5d attached to the upper surface.
6 is a boat support for horizontally holding the current collecting boat 5, 7 is an overhead line, and the pantograph is constituted by such a thing.

The operation is performed by a main spring (not shown) in the underframe.
The pushing force is given by the tension of the contact point, and the sliding plate 5d on the upper surface of the current collecting boat contacts and slides on the overhead line 7 with a predetermined pushing force, and the vehicle travels by collecting the current from the overhead line 7.

[0004]

Since the pantograph of the vehicle is arranged on the roof of the vehicle, it receives the aerodynamic force of the traveling wind when the vehicle travels, and this aerodynamic force has a lift and a drag.

Since the lift force overlaps with the push-up force of the pantograph and causes an increase / decrease in the contact force between the overhead wire and the contact plate, it greatly affects the followability of the pantograph and the wire separation. Further, the drag force increases the running resistance of the vehicle and causes wind noise (aerodynamic noise) and the like.

Most of the lift and drag values of a pantograph are usually occupied by the lift and drag forces of a current collector. Also,
Since the lift and drag increase in proportion to almost the square of the vehicle speed, when the vehicle runs at high speed, the lift and drag generated by the current collector will not be negligible, and will be great for the pantograph tracking performance. It will have an impact.

A conventional pantograph current collecting boat is constructed by arranging two boat bodies having a substantially rectangular cross section in series with respect to the direction of traveling wind. Due to turbulence, lift does not occur much, but drag is large.

The large drag means that the turbulence of the air flow around the collector boat is large, and this turbulence of the air flow causes a large pressure fluctuation around the collector boat, which causes a large wind noise. For this reason, the conventional current collecting boat does not hinder high-speed traveling in terms of lift characteristics, but has a drawback that it has a large drag force and produces a large wind noise when traveling at high speed.

The present invention was devised in view of the above-mentioned points, and the purpose of the present invention is to improve lift characteristics.
(EN) Provided is a current collecting boat device having characteristics equivalent to those of a conventional one, and having a drag force significantly smaller than that of the conventional one, and thus having a low wind noise.

[0010]

[Means for Solving the Problems] A means for achieving the object is that a current collecting boat device has a cross-section, a Mt. Fuji shape in the upper and lower surfaces, and the upper and lower Mt. It is characterized in that it has a shape that is connected by a curved line.

Further, it is possible to make the lengths of the upper and lower planes of the top of the Mt. Fuji shape different from each other.

Further, it is also possible to adopt a shape in which the radius of curvature of the intersection of the flat end and the slope of the top of the Mt. Fuji shape is variable.

That is, the one which is conventionally composed of two boats is made into one boat, and the cross-section is almost elliptical to reduce the drag force. However, since the current collecting boat performs sliding current collection with overhead lines as required performance, the contact plate attached to the upper surface of the current collecting boat must have a smooth flat surface with a predetermined length in the front-rear direction.

The smooth flat surface on the upper surface generates downward lift due to the traveling wind to reduce the contact force with the overhead wire, which adversely affects the following performance. In order to prevent this downward lift, the current collector boat of the present invention has a shape having a smooth flat surface portion on the lower surface as well, which has a small drag force and an appropriate lift characteristic.

[0015]

Next, the operation will be described.

1) As a current collecting boat consisting of a single boat body that is close to an elliptical shape as a whole, the turbulence of the air flow around the current collecting boat is reduced to reduce the drag force.

2) A smooth flat surface portion is provided on the lower surface corresponding to the smooth flat surface portion of the upper surface of the collector boat, and the lengths of the upper and lower smooth flat surface portions are changed, and the corners of the smooth flat surface end portions are changed. Prevents an increase in drag by changing the roundness,
In addition, we are trying to obtain an appropriate lift.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment of a current collecting device equipped with a current collecting boat of the present invention. FIG. 1 is a mechanism diagram thereof, FIG. 2 is a cross-sectional explanatory view of the current collecting boat, and FIG. FIG. 7 is a plan view of the current collecting boat, in which the same reference numerals as those in FIG. 6 indicate parts having the same configurations and functions.

As shown in FIG. 2, the upper and lower surfaces have a Mt. Fuji shape, and the upper and lower Mt. Fuji-shaped slope skirts are connected by semi-elliptical curves to form a cross-sectional shape. Further, as shown in FIG. 2, it is possible to make the lengths of the planes on the upper surface side and the lower surface side of the top of the Mt. Fuji shape different.
Further, as shown in FIG. 2, the shape may be such that the radius of curvature of the intersection of the flat end and the slope of the top of the Mt. Fuji shape is variable.

These will be described in detail. 1 to 3, 10 is a current collecting boat of the present invention, which is held horizontally by a boat support 6 and is in sliding contact with an overhead line 7 with a predetermined pushing force.
Is a hull frame having an elliptical cross section, 10b is a trapezoidal sliding plate attached to the upper surface of this hull frame 10a,
The upper part has a smooth flat surface for sliding contact with the overhead line 7, and the lower part is closely attached to the hull frame 10a.

Reference numeral 10c is a trapezoidal member attached to the lower surface of the boat frame 10a, the upper portion of which is closely attached to the boat frame 10a and the lower portion thereof has a smooth flat surface. Note that FIG.
In the above, the hull frame 10a, the sliding plate 10b, and the member 10c are formed in a curved shape, but the present invention is not limited to this, and they may be formed linearly and adhered closely to each other. May be embedded.

In the present embodiment, the curve connecting the lower ends of the upper and lower Mt. Fuji slopes with respect to the cross-sectional shape of the current collector is a semi-elliptical shape, but if the shape is such that air flows smoothly It is needless to say that the present invention is not limited to this, and is also included for other curves such as a cubic curve and a parabola.

The top surface 10b1 and the bottom surface 10c1 of the top of the Mt. Fuji shape may have the same plane length, but different plane lengths may be used as shown in FIG.
It may be Lb and Lc. Note that, for convenience of explanation, in FIG. 2, the lengths of the top surface and the bottom surface of the top of the Mt. Fuji shape are shown differently.

Further, as shown in FIG. 2, the radius of curvature Rb at the intersection of the flat portion 10b2 and the slope 10b3 at the top of the Mt. Fuji shape, and the radius of curvature Rc at the intersection of the flat portion 10c2 and the slope 10c3 are varied. May be

Next, the operation will be described with reference to FIGS. FIG. 4 is a wind tunnel test characteristic diagram of a relation between wind speed and lift of a conventional pantograph current collecting boat and a current collecting boat at the basic stage of the present invention, and FIG. 5 is a wind tunnel test characteristic of the same drag relation. It is a figure. In FIG. 4, the solid line shows the lift characteristics of the conventional product, and the dashed-dotted lines No1 and No2 are the current-collecting boats at the basic stage of the current-collecting boat of the present invention, and No1 is the hull frame 10a shown in FIG. Characteristics of almost the same shape oval cross section hull, No2
Shows the characteristics of a hull in which only the sliding plate 10b is attached to the hull frame 10a.

Comparing No1 and No2, it can be seen that downward lift is exerted by attaching the sliding plate 10b to the boat having an elliptical cross section. Also, the value of lift is
No1 is too large, No2 is too small.

However, from the drag graph of FIG. 5, No1, N
It can be seen that both o2 and the conventional product have significantly reduced drag.

The current collecting boat of the present invention was created from the results of the examination of the basic stage current collecting boat described above, and its lift characteristics are shown in No. 3 to No. 6 in FIG.

In FIG. 4, No3 is the length Lc> Lb of the trapezoidal plane in FIG. 2, and No4 is the length Lc = Lb of the plane.
In the case of No. 5, No. 5 is the case where the plane length Lc <Lb, and it is understood that the lift is gradually reduced by changing the relationship between the plane lengths Lc and Lb. In addition, No6 is the state of No3 (Lc> L
In b), the lift is reduced when the rounded portion Rc is added to the intersection of the flat surface portion 10c2 and the sloped surface 10c3 of the member 10c.

Considering these states, in the case of No1 and No2, No2 has a trapezoidal front edge of the upper surface, which causes airflow separation on the upper surface of the boat, which causes turbulence and causes pressure on the upper surface. Lifted and a downward lift was generated. For No3 to No5, because the trapezoidal shape is attached to the upper and lower surfaces of the hull, turbulence occurs due to airflow separation on both the upper and lower surfaces of the hull, and the pressure difference between the upper and lower surfaces is reduced, but due to the difference in lengths Lc and Lb. Since the positions of the separation points are different, whether the lift is upward or downward is determined by the difference.

In the case of No. 6, the edge of the trapezoidal front end of the lower surface of the hull, which is the airflow separation point on the lower surface of the hull, is rounded in comparison with No. 3 to reduce the separation, so that the turbulence of the airflow on the lower surface of the hull is reduced. Is decreased, the pressure difference with the upper surface of the ship is increased, and the lift is decreased. That is, the lift is increased by rounding the edge of the trapezoidal front end on the upper surface of the boat.

This means that the lift characteristics of the current collecting boat are adjusted by adjusting the lengths of the flat portions of the trapezoidal members attached to the upper and lower surfaces of the boat and by changing the roundness of the flat end portions. Is possible.

FIG. 5 shows the drag characteristic of the above-described current collecting boat of the present invention.
As shown in No. 3 to No. 6 in the table, the drag force is greatly reduced compared to the conventional products. From this, it can be said that the current collecting boat of the present invention has less turbulence of the air flow than the conventional product, and produces less wind noise even when traveling at high speed.

[0034]

As described above, the current collecting boat device of the present invention has the above-mentioned structure and function, and has the following effects.

(1) Lift characteristics are adjusted by changing the length of the upper flat surface of the trapezoidal member attached to the upper and lower surfaces of the hull frame and the radius of curvature Rb, Rc of the corner of the end surface of the flat surface. It is possible. (2) Due to the cross-sectional shape as described above, the drag force can be significantly reduced compared to the conventional product. (3) A small drag means that the turbulence of the air flow around the current collecting boat is small, and the wind noise generated by the turbulence of the air flow is small.

As a result of the above effects, the current collecting boat device of the present invention can be used as a current collecting boat device for a vehicle traveling at a high speed, with good lift characteristics to obtain good followability, to reduce running resistance, and at high speed running. It is possible to obtain a current collecting device with low wind noise.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing an embodiment of a current collector equipped with a current collector of the present invention.

FIG. 2 is a cross-sectional explanatory view of the current collecting boat of FIG.

FIG. 3 is a plan view of the current collecting boat of FIG.

FIG. 4 is a wind tunnel test characteristic diagram showing the relationship between wind speed and lift of a conventional pantograph current collector, a current collector boat at the basic stage of the present invention, and the current collector boat of the present invention.

FIG. 5 is a wind tunnel test characteristic diagram of the relationship of drag force.

FIG. 6 is a mechanism diagram showing an example of a current collector used conventionally.

FIG. 7 is a schematic plan view of a current collecting boat that has been conventionally used.

[Explanation of symbols] 1 vehicle body 2 support insulator 3 pantograph underframe 4 frame assembly 5 current collecting boat 5a, 5b boat 5c connecting 5d sill plate 5 current collecting boat 6 boat support 7 overhead line 10 current collecting boat 10a according to the present invention Vessel frame 10b Riding plate 10c Trapezoidal member 10b2, 10c2 Plane part 10b3, 10c3 Slope Lb, Lc Plane length Rb, Rc Smooth surface part Corner radius of curvature

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Naito 2-4-24 Shibata, Kita-ku, Osaka City, Osaka Prefecture West Japan Railway Company (72) Inventor Shuji Kubota 2-chome, Shibata, Kita-ku, Osaka City, Osaka Prefecture No. 4-24 West Japan Railway Company (72) Inventor Tetsuji Oshima 4-63, Higashi-Kashigaya, Ebina City, Kanagawa Prefecture Sagami Plant, Toyo Denki Seigyo Co., Ltd. (72) Hiroyuki Arai, Ebina City, Kanagawa Prefecture 4-63 Kashiwagaya Toyo Electric Manufacturing Co., Ltd. Sagami Factory

Claims (3)

[Claims] 1. A current collecting boat device having a cross-section, a top and bottom surface having a shape of Mt. Fuji, and the top and bottom surfaces of the slopes of the shape of Mount Fuji are connected by a semi-elliptical curve. 2. The current collecting boat apparatus according to claim 1, wherein the top surface and the bottom surface of the top of the Mt. Fuji shape have different lengths. 3. The current collecting boat device according to claim 1 or 2, wherein a radius of curvature of an intersection of a flat end and a slope of the top of the Mt. Fuji shape is variable.