JPH0242001Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a cross-shaped pantograph with a lower frame for collecting electricity in an electric vehicle.

Cross-shaped pantographs with a lower frame occupy a small volume, are durable, have good current collection performance, and are suitable for use in high-speed vehicles, but when folded, the longer protruding shaft interferes with the lower frame attached to the shorter protruding shaft. I don't like that the height when folded is high. As seen in subways, electric vehicles are required to have smaller vehicle dimensions as tunnel cross sections are reduced to reduce construction costs. Therefore, it is desirable that the lower frame cross-shaped pantograph has a folded height as low as possible and is easy to assemble and maintain.

[Prior art and its problems]

FIG. 3 is a side view showing the general structure of a conventional cross-frame pantograph, and FIG. 4 is a partial plan view thereof. In these figures, 1 is an underframe attached to the roof of the vehicle body via an insulator (not shown). A pantograph lower frame 4 is attached to both ends of two parallel rotating shafts 3 that are attached to the underframe 1 via bearings 2 at right angles to the vehicle body traveling direction, and an upper frame 5 is rotatably attached to the lower frame 4. A collector boat 6 is attached to the upper end of the boat so as to be brought into sliding contact with the overhead wire 7. Both ends of the rotation shaft 3 are made to protrude from the underframe 1 alternately in longer and shorter lengths so as to intersect with the lower frame 4. A spring mounting lever 8, a balancing cylinder mounting lever 9, and a folding cylinder mounting lever 10 are mounted on the rotation shaft 3.

FIG. 5 is a perspective view of the rotating shaft, FIG. 6 is a detailed front view of the rotating shaft, and FIG. 7 is an enlarged view of section P in FIG. 6.
Each lever attached to the rotating shaft 3 is fixed by a fixing screw 11 that is fitted onto the shaft and passes through the lever in a direction perpendicular to the shaft. A spring 12 is attached to the spring attachment lever 8 across both shafts to push up the current collector boat and keep it in contact with the overhead wire 7. A balance cylinder (not shown) is connected to the balance cylinder mounting lever 9 via a balance rod 13.
A pneumatic cylinder (not shown) is connected to the folding cylinder mounting lever 10, and the pneumatic cylinder is operated by pneumatic pressure.
The pantograph is folded by rotating the rotating shaft 3 against the spring 12. A U-shaped bent portion 31 is provided on the longer protruding shaft end 3a of the rotation shaft 3, and a lower frame 4 is attached to the shorter protruding shaft end 3b as shown in FIG. 7 when the pantograph is folded.
The folding height is lowered by fitting into the folding part. In order to position and fix the levers 8, 9, and 10 on the shaft 3, the shaft 3 is provided with steps so that they fit together. For this reason, the center part of the shaft 3 is the maximum diameter, and the diameter is gradually narrowed toward both short sides, and the U-shaped bent part 31 is used as a joint shaft that can be attached to and detached from the shaft 3. After the lever and bearing are attached, the U-shaped bent part 31 is I'm trying to combine them. The U-shaped bent portion 31 is firmly fitted into a hollow hole provided in the shaft 3 and fixed with a dowel pin 14. The numbers shown in the stepped portions of FIG. 4 correspond to the numbers of the bearings and levers in FIG. 3.

Since the above-mentioned lower frame intersecting pantograph uses a joint shaft as its rotation axis, the shaft end protruding from the bearing is long, and the shaft diameter of the upper joint part must be made thicker. There are concerns about the
In addition, there was a drawback that it took time and effort to attach and detach the connecting shaft during bearing maintenance.

[Purpose of invention]

The object of the present invention is to eliminate the above-mentioned drawbacks and provide a cross-shaped pantograph with a lower frame, which has a low folding height, is compact, highly reliable, and easy to assemble and maintain.

[Key points of the idea]

This invention has a U-shaped bend at the longer protruding shaft end of the rotating shaft of a pantograph with a crossed lower frame, to avoid interference between the shaft and the lower frame when the pantograph is folded, and to lower the folding height. At the same time, the rotating shaft is formed as an integral shaft with the maximum diameter at the base end of the bent part and gradually narrowing in steps, so that the bearings and levers attached to the rotating shaft can be assembled from one direction. It is something.

[Example of idea]

Fig. 1 is a partial plan view of a cross-shaped lower frame pantograph according to an embodiment of the present invention, Fig. 2 is a detailed front view of its rotation axis, and parts indicated by the same symbols as in Figs. 4 and 6 are the same parts. It is. The longer protruding shaft end 3 of the rotation shaft 3
A is provided with a U-shaped bent portion 31, which is formed integrally with the shaft 3 by forging, stamping, welding, or the like. The shaft 3 has a maximum diameter at the base end of the bent part 31 and tapers stepwise toward the shorter protruding shaft end 3b, and a bearing and a lever are assembled into each step part from the 3b end and fitted. I try to do that. 3c is a recess into which a fixing screw 11 that passes through the lever in a direction perpendicular to the shaft is fitted. Therefore, the mounting shaft of the bearing 2a on the shaft end 3a side is made thicker than the mounting shaft of the bearing 2b on the shaft end 3b side. Since the stepped portion only needs to have a step difference of about 0.5 mm, the difference in shaft diameter between portions 2a and 2b is actually not that large.

With this structure, the bearings and levers can be assembled from one direction on the rotating shaft, and the U-shaped bent part for lowering the folding height is integrated with the rotating shaft, so the protruding shaft end is Become short and strong.
Further, by providing fixing screws, the fit of the levers does not need to be very hard, so that they can be easily attached to and detached from the rotating shaft during bearing maintenance.

[Effect of idea]

According to the present invention, the lower frame cross-shaped pantograph can have a low folded height, is compact and durable, and is easy to assemble and disassemble, resulting in improved reliability and maintainability.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view showing an embodiment of the present invention, Fig. 2 is a front view of a rotating shaft according to an embodiment of the invention, Fig. 3 is a side view schematically showing a lower frame intersecting pantograph, and Fig. 4 is a partial plan view showing an embodiment of the present invention. The figure is a partial plan view showing the conventional example, FIG. 5 is a perspective view of the rotating shaft in the conventional example, FIG. 6 is a front view showing details of the rotating shaft in the conventional example, and FIG. 7 is the P of FIG. This is an enlarged section of the section. 1: Underframe, 2: Bearing, 3: Rotation axis, 4: Lower frame,
8: Spring mounting lever, 9: Balance cylinder mounting lever, 10: Folding cylinder mounting lever, 11:
Fixing screw, 31: U-shaped bent part.

Claims (1)

[Scope of utility model registration request] At the tips of two parallel rotating shafts that are attached to the underframe via bearings, with the shaft ends protruding alternately long and short,
In a pantograph with a crossed lower frame, in which the lower frame is attached in a crossed manner, the longer protruding shaft is provided with a U-shaped bent part into which the lower frame attached to the shorter protruding shaft fits when the pantograph is folded. , a lower frame characterized in that these rotating shafts are formed as an integral shaft having a maximum diameter at the base end of the U-shaped bent part and gradually narrowing in a step-like manner, so that the bearings and levers can be attached from one direction. Cross-shaped pantograph.