JP3748599B2 - Buffer mechanism in linear motion pantograph device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorbing mechanism for a direct acting pantograph device in which a current collecting boat body is vertically moved by a lift cylinder device.
[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 brought into contact with and separated from the overhead line. For the purpose of reducing aerodynamic noise, one mast provided with the current collector boat is vertically moved by a lift cylinder. A direct-acting pantograph device that can be moved up and down has been proposed.
[0003]
The above-mentioned direct acting pantograph device releases the contact with the overhead wire by lowering the current collector boat body, but if this state is maintained, the height of the mast is lowered even if the current collector boat body is lowered. Therefore, it cannot meet the various legal standards that set the limits of railway vehicles. In view of this, it is conceivable to bring the mast down into the stowed state using an air cylinder using compressed air supplied from the compressor of the vehicle.
[0004]
[Problems to be solved by the invention]
As described above, in the direct-acting pantograph device, in order to be able to select either the use state or the storage state, it is advantageous to use an air cylinder that uses compressed air from a compressor originally provided in the vehicle. is there. However, the mast of the direct-acting pantograph device is composed of a slider, a lift cylinder that moves the slider up and down, a current collector hull, a cover, etc. A large impact is applied to the mast when stopping at the end.
[0005]
It is conceivable to use a hydraulic damper as a means to solve this problem. However, if it is arranged without any ingenuity, it will hinder the arrangement of other members, and it will have no relation to the air cylinder for raising and lowering the mast. If it is not arranged, there will be disadvantages such as selecting a hydraulic damper with a larger capacity than necessary.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a linear motion pantograph apparatus in which a mast provided with a current collector boat body is provided so as to be movable up and down with respect to a base, and the base is rotatably supported on a frame around an axis. An air cylinder for raising and lowering the base between the use position and the storage position is disposed between the lever provided on the base and the mount provided on the frame, and the hydraulic damper is substantially parallel to the air cylinder. And the direction of the hydraulic damper is set to extend or compress in synchronization with the air cylinder.
[0007]
Moreover, it is preferable that the hydraulic damper includes an oil lock mechanism in which an extension stroke and a standing stroke of the mast coincide with each other and act at an extension end.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a side view of a linear motion pantograph device to which the buffer mechanism according to the present invention is applied, FIG. 2 is a plan view of the linear motion pantograph device, and FIG. 3 shows a hydraulic damper of the buffer mechanism according to the present invention. FIG. 4 is an enlarged side view taken along the line AA of FIG. 1.
[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]
The mast 5 is provided with a lift cylinder 6 that is operated by air on the base 4, and a slider 7 is moved up and down by the lift cylinder 6. A current collecting boat body 9 is connected to the upper end of the slider 7 and the housing 8. And the current collector boat 9 and the switch on the vehicle body side are electrically connected by a shunt lead wire 10. The shunt lead wire 10 is disposed inside the cover 11 that reduces the wind pressure.
[0011]
By the way, the horizontal shaft 3 is hollow, and pipes 12, 13, and 14 for operating an air cylinder to be described later are connected to the manifold 15 through the horizontal shaft 3. Incidentally, the pipe 12 is a pipe for supplying compressed air to the lower chamber of the lift cylinder 6, the pipe 13 is a pipe connected to the rise detection device, and the pipe 14 is a pipe for discharging compressed air from the upper chamber of the lift cylinder 6.
[0012]
In addition, a lever 16 that rotates the horizontal shaft 3 about the axis is welded to both ends of the horizontal shaft 3, and mounts 17 are provided on the left and right sides of the frame 1, and air is provided between these levers 16 and the mount 17. A pair of mast raising and lowering cylinders 18 that operate in a right and left direction are arranged. Specifically, the tip of the rod 19 of the cylinder 18 is connected to the lever 16 and the base end of the cylinder 18 is connected to the mount 17.
[0013]
On the other hand, another mount 20 is provided in the vicinity of the mount 17, and a hydraulic damper 21 is disposed between the mount 20 and the lever 16 so as to extend or compress substantially in parallel with the mast raising cylinder 18 and in synchronization. ing. Specifically, the tip of the rod 22 of the hydraulic damper 21 is connected to the lever 16, and the base end of the damper 21 is connected to the mount 20.
[0014]
Further, as shown in FIG. 3, the hydraulic damper 21 communicates the space between the outer tube 23 and the inner tube 24 with the inside of the sub tank 25, and the tip of the rod 22 inserted into the inner tube 24 via the guide 26. Further, an oil lock piece 28 is attached to the rod 22 and an oil lock collar 29 to which the oil lock piece 28 is fitted when extended is attached to the rod 22.
[0015]
In FIG. 1, an arm 30 that locks the mast 5 in a tilted position on the underframe 1, a storage lock cylinder 31 that operates the arm 30, an upright detection valve 32 that detects that the mast 5 has stood up, and the mast 5 A lock mechanism 33 that locks the lock mechanism 33 in a standing position, a mast lock cylinder 34 that operates the lock mechanism 33, and the like are provided.
[0016]
As described above, when air is supplied to the compression side chamber of the mast raising cylinder 18 with the lock mechanism 33 being released, the lever 16 rotates clockwise about the horizontal axis 3 in FIG. 4 and the mast 5 also rotate clockwise about the horizontal axis 3 and fall to the position indicated by the imaginary line in FIG.
[0017]
The hydraulic damper 21 is also compressed in synchronism with the above operation, and the damping force generated during the compression gives resistance to the rotation of the base 4 and the mast 5 to alleviate the impact at the time of stopping.
[0018]
On the other hand, when the storage lock arm 30 is released and air is supplied to the expansion side chamber of the mast raising cylinder 18, the lever 16 rotates counterclockwise around the horizontal shaft 3 and the base 4 and the mast. 5 also rotates counterclockwise about the horizontal axis 3 and rises from the position indicated by the imaginary line in FIG. 1 to the position indicated by the solid line.
[0019]
The hydraulic damper 21 also expands in synchronization with the above operation, and the damping force generated during the expansion provides resistance to the rotation of the base 4 and the mast 5 to alleviate the impact at the time of stopping. In particular, the mast raising / lowering cylinder 18 is subjected to a larger force during the extension stroke due to the difference in the pressure receiving area of the piston. Therefore, in the present embodiment, an oil lock mechanism that acts when the hydraulic damper 21 is extended is provided to the structure that resists the large force of the mast raising cylinder 18.
[0020]
【The invention's effect】
As described above, according to the present invention, the base of the direct-acting pantograph device is rotatably supported on the frame, a lever is provided on the base, and the lever is mounted between the lever and the mount on the frame. Since the air cylinder for raising and lowering the base between the use position and the storage position is disposed, and the hydraulic damper is disposed substantially in parallel with the air cylinder, a limited installation space can be used effectively.
[0021]
In addition, since the direction of the hydraulic damper is set to extend or compress in synchronization with the air cylinder, the structure itself is easy to understand, and since the extension stroke of the hydraulic damper and the standing stroke of the mast match, Immediately before a large impact is applied, the impact can be absorbed by a compression stroke of a hydraulic damper that can exert a large force.
[0022]
As for air cylinders, the extension stroke exerts a greater force due to the difference in pressure receiving area. By providing an oil lock mechanism that acts at the extension end on a hydraulic damper that has the same expansion and contraction stroke as this air cylinder, the air cylinder The impact at the extended end of the can be effectively absorbed by the hydraulic damper.
[Brief description of the drawings]
FIG. 1 is a side view of a linear motion pantograph device to which a buffer mechanism according to the present invention is applied. FIG. 2 is a plan view of the linear motion pantograph device. FIG. 3 is a sectional view of a hydraulic damper of the buffer mechanism according to the present invention. Enlarged side view shown [FIG. 4] Enlarged sectional view along line AA in FIG.
DESCRIPTION OF SYMBOLS 1 ... Underframe, 2 ... Insulator, 3 ... Horizontal axis, 4 ... Base, 5 ... Mast, 9 ... Current collecting boat body, 16 ... Lever, 17, 20 ... Mount, 18 ... Mast raising cylinder, 19 ... Mast raising Inverting cylinder rod, 21 ... hydraulic damper, 22 ... hydraulic damper rod, 28 ... oil lock piece, 29 ... oil lock collar.

Claims (2)

  In a direct acting pantograph apparatus in which a mast provided with a current collector boat body is provided so as to be movable up and down relative to a base, and the base is pivotally supported on a frame around an axis, a lever and a frame provided on the base An air cylinder for raising and lowering the base between the use position and the storage position is disposed between the mount provided above, and a hydraulic damper is disposed substantially parallel to the air cylinder, and the direction of the hydraulic damper is set. A shock absorbing mechanism in a direct acting pantograph device, characterized in that the direction is extended or compressed in synchronization with the air cylinder.   The shock absorbing mechanism in the direct acting pantograph device according to claim 1, wherein an extension stroke of the hydraulic damper and a standing stroke of the mast coincide with each other, and the hydraulic damper includes an oil lock mechanism that operates at an extension end. A shock-absorbing mechanism in a direct-acting pantograph device.

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