JP3778972B2 - Shock absorption structure of direct acting pantograph device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorbing structure for a direct acting pantograph device in which a current collecting boat body is moved up and down by a lift cylinder device among pantograph devices provided on the roof of an electric vehicle for collecting current.
[0002]
[Prior art]
A general structure of a pantograph device for supplying electric power from an overhead wire to a vehicle is as shown in Japanese Patent Application Laid-Open No. 62-68002 and Japanese Patent Application Laid-Open No. 63-92202. The current collector boat provided at the top of the body is in contact with and separated from the overhead line. In this pantograph device, the frame itself is used as a power supply conductor.
[0003]
Recently, for the purpose of reducing aerodynamic noise, a direct-acting pantograph device has been proposed in which one mast provided with a current collector boat body is vertically moved by a lift cylinder.
[0004]
[Problems to be solved by the invention]
The mast of the linear motion pantograph device described above is a heavy object composed of a slider, a current collector boat body, a cover, etc., so when the lift cylinder is reduced and lowered, it cannot be decelerated suddenly and cannot be stopped. The shock at will become large.
[0005]
In order to avoid this, it is conceivable to place a spring at the lower end of the lift cylinder, but here, dust is generated in the lift cylinder due to the sliding of the rod and the impact with the stopper, and the stroke of the cylinder is the absorber. Therefore, the position is not suitable.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a linear motion type in which a slider is moved up and down along a main pipe by a lift cylinder so that a current collecting boat body provided on the slider is brought into contact with and separated from an overhead wire. In the pantograph device, the lift cylinder is constituted by an air cylinder, and an absorbing member for absorbing an impact at the time of maximum compression is provided at one end thereof.
[0007]
Here, the absorbing member is preferably provided on the outer periphery of the upper end of the air cylinder. By adopting such a structure, it is not affected by dust generated in the lift cylinder due to the sliding of the rod or the impact with the stopper portion, and the buffering force is not hindered.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a side view of a linear motion pantograph device to which a shock absorbing structure according to the present invention is applied, FIG. 2 is a plan view of the linear motion pantograph device, and FIG. 3 is an enlarged side of a mast portion of the linear motion pantograph device 4 is a cross-sectional view, FIG. 4 is an AA arrow view of FIG. 3, and FIG. 5 is a vertical cross-sectional view of the lift cylinder.
[0009]
In the direct-acting pantograph device, a frame 1 is insulated and attached to the roof of a vehicle via an insulator 2, a horizontal shaft 3 is provided on the frame 1, and one end of a base 4 is rotatable on the horizontal shaft 3. The mast 5 is provided on the base 4.
[0010]
A lever 6 is attached to the base 4, and a pair of mast raising / lowering cylinders 7 that are operated by air are disposed between the lever 6 and the frame 1, and further between the lever 6 and the frame 1. A hydraulic damper 8 is disposed substantially parallel to the mast raising cylinder 7 to absorb shocks at the mast standing position and the falling position.
[0011]
In addition, by compressing the mast raising cylinder 7, the mast 5 falls to the imaginary line position in the figure, and by extending the mast raising cylinder 7, the mast 5 stands up to the vertical position shown by the solid line in the figure. Further, the mast extends in the direction of arrow a in a lift cylinder described later.
[0012]
Further, an arm 9 that locks the mast 5 in a tilted position on the underframe 1, a storage lock cylinder 10 that operates the arm 9, an upright detection valve 11 that detects that the mast 5 has stood up, and a mast 5 in the upright position A lock mechanism 12 that locks the lock mechanism 12 and a mast lock cylinder 13 that operates the lock mechanism 12 are provided.
[0013]
As shown in FIG. 3, the mast 5 has a lift cylinder (air cylinder) 40 that is operated by air on the base 4, and a slider 15 is disposed outside the lift cylinder 40. And the upper end of the rod 41 of the lift cylinder 40 are connected via the housing 16, and the main pipe 18 is disposed outside the slider 15, and the inner side supported on the base 4 side outside the main pipe 18. A cover 19 is disposed, and an outer cover 20 that moves up and down with the expansion and contraction of the lift cylinder 40 is disposed outside the inner cover 19.
[0014]
The housing 16 is attached with a guide 21 inside a recess provided in the center, and a cylindrical body 22 having an upper end closed is slidably inserted inside the guide 21, and the lower end of the lift cylinder 40 is inserted into the cylindrical body 22. A high frequency absorbing spring 23 supported by the upper end of the rod 41 is disposed, and a top plate 24 is fixed to the upper end of the cylindrical body 22, and a lid body 25 prevents dust and the like from entering the pantograph device on the top plate 24. A current collecting boat body 26 is provided on the top plate 24 to take in current in contact with the overhead wire. The current from the overhead wire flows through a sliding plate provided on the current collector boat body 26.
[0015]
The lower part of the main pipe 18 is fixed via a bracket or the like, and a plurality of guide parts 30 are attached to the upper part. As shown in FIG. 4, the guide unit 30 is disposed on the X axis and two rotatable guide rollers 31 and 32 having a support shaft in the Y axis direction, and at a symmetrical position with the X axis interposed therebetween. The four freely rotatable guide rollers 33, 34, 35, 36 having a support shaft in the X-axis direction are exposed from the openings 18 a, 18 b formed in the main pipe 18, and the guide rollers 31, 32 are respectively attached to the slider 15. The slider 15 is controlled to swing in the X-axis direction by contacting the radial guide sides 15a and 15b on the X-axis, and the guide rollers 33 and 34 and the guide rollers 35 and 36 are respectively guided at the four corners of the slider 15. The rotation around the center O of the slider 15 is restricted by contacting the sides 15c and 15d and the guide sides 15e and 15f in the Y-axis direction. Reference numeral 15g denotes a retaining prevention protrusion.
[0016]
Moreover, the lift cylinder 40 has applied the shock absorption structure which concerns on this invention to the upper outer side, This shock absorption structure is demonstrated with reference to FIG.
The lift cylinder 40 has a spring seat member 42 attached to the upper end thereof, and the outer periphery of a bump stopper cap 43 through which the piston rod 41 is inserted is screwed onto the inner periphery of the upper portion of the small diameter portion to seal the upper end.
[0017]
Further, the spring seat member 42 is press-fitted and fixed to the outer periphery of the lower large-diameter portion until the lower end of the shock-reducing spring (absorbing member) 44 comes into contact with the flange portion 42 a formed on the outer periphery of the lower end of the spring seat member 42. . The spring seat member 42 and the spring 44 constitute a shock absorbing structure.
[0018]
Here, 45 is a rod guide for guiding the raising and lowering of the piston rod, and 46 is a piston attached to the tip of the piston rod 41 by a nut 47.
The lift cylinder 40 has a bottom piece 48 attached to the lower end portion to seal the lower end portion, and is connected to an external air source by forming air passages 49 and 50 communicating with the upper chamber and the lower chamber.
In this embodiment, a spring is used as the absorbing member. However, the present invention is not limited to this as long as the impact can be mitigated. For example, the absorbing member may be made of resin or a hydraulic shock absorber.
[0019]
In the above configuration, for example, when the lower chamber is opened to the atmosphere via the air passage 50, the slider 15 descends,
Its lower end collides with the base 4. At this time, before the slider 15 collides with the base 4, the lower end of the housing 16 that engages the upper end of the rod 41 of the lift cylinder 40 and the upper end of the slider 15 collides with the spring 44. Thus, the lowering speed is sharply reduced by the spring force in the extending direction, and the impact at the time of collision is alleviated.
[0020]
【The invention's effect】
As described above, according to the present invention, the lift cylinder of the direct-acting pantograph device is composed of an air cylinder, and an absorbing member that absorbs shock at the time of the most compression is provided at one end thereof. The impact during compression is absorbed by the absorbing member.
[0021]
In addition, since the absorbing member is provided on the outer periphery of the upper end of the air cylinder, for example, when a spring is used as the absorbing member, the stroke of the spring is large without sacrificing the stroke of the lift cylinder as compared with the case where it is arranged in the lift cylinder. And effective buffering can be achieved, and the mast is not subjected to a large impact when stopping at the lower limit.
[Brief description of the drawings]
FIG. 1 is a side view of a linear motion pantograph device to which a shock absorbing structure according to the present invention is applied. FIG. 2 is a plan view of the linear motion pantograph device. FIG. 3 is an enlarged view of a mast portion of the linear motion pantograph device. Side sectional view [Fig. 4] AA arrow view of Fig. 3 [Fig. 5] Vertical section of lift cylinder [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Underframe, 4 ... Base, 5 ... Mast, 6 ... Lever, 7 ... Mast raising cylinder, 8 ... Hydraulic damper, 9 ... Arm, 10 ... Storage lock cylinder, 11 ... Standing detection valve, 12 ... Lock mechanism, DESCRIPTION OF SYMBOLS 13 ... Mast lock cylinder, 15 ... Slider, 16 ... Housing, 18 ... Main pipe, 19 ... Inner cover, 20 ... Outer cover, 21 ... Guide, 33 ... Cylindrical body, 23, 44 ... Spring, 24 ... Top plate, 25 DESCRIPTION OF SYMBOLS ... Cover body, 26 ... Current collector boat body, 30 ... Guide part, 31-36 ... Guide roller, 40 ... Lift cylinder, 41 ... Piston rod, 42 ... Spring sheet member, 42a ... Flange part, 43 ... Bump stopper cap, 45 ... Rod guide, 46 ... Piston, 47 ... Nut, 48 ... Bottom piece, 49, 50 ... Air passage.

Claims (1)

In a linear motion pantograph device in which a slider is moved up and down along a main pipe by a lift cylinder, and a current collector boat supported by the slider is connected to and separated from an overhead wire, the lift cylinder is separated from an air cylinder. In the shock absorbing structure of the direct acting pantograph device in which the absorbing member that absorbs the shock at the time of the most compression is provided between the air cylinder and the rod , the shock absorbing mechanism is provided on the outer periphery of the upper end of the air cylinder. The shock absorption structure of the direct acting pantograph device.

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