JPS5852858B2 - Extremely small radius traveling trolley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bogie structure for a vehicle that runs on a curve with an extremely small radius.

In the past, conventional railway vehicles were said to be extremely difficult to travel on curves with a radius of 20 m or less, and bogies with small wheel diameters and extremely small wheelbases were designed to barely pass through curves with a radius of 20 m or less. Once the wheel diameter, wheelbase, and curve radius are determined, the angle at which the wheel and curved rail contact is determined from the slack, etc., and at the same time, the contact point of the flange with the rail is determined.

As the wheel diameter increases, the contact point of this flange with the rail suddenly becomes farther away from the wheel tread, and the contact sliding speed between the flange and the rail increases.If the sliding speed and contact lateral pressure exceed a certain level, the rail, flange It has been confirmed that severe galling occurs in both cases, resulting in wear that looks like it has been scraped off when both are used together.

For this reason, it is known that when a wheel with flanges is used to run on a curve with a very small radius, for example, 10 mR or less, severe wear occurs, and even if the wheel does not derail, it cannot withstand the lifespan determined by the wear.

For example, it has been proposed to create a one-axis bogie as shown in Figure 1 and run it in a very small radius with guide wheels.

In this system, a bogie 2 is attached with a center plate 3 that restrains pitching and rolling movements relative to the car body 1 and only allows rotation of the bogie 2, and running wheels 4 without flanges provided on the bogie 2,
Run on rail 6.7 at 5.

In this case, guide wheels 8A, 8B rotating around a vertical axis
, 9A, 9B are installed, and this trolley 2 is connected to one rail 6.
Guided driving is performed based on this.

If such a traveling device is used, it should be possible to travel on curves with extremely small radii.

However, in recent years, transportation devices in various factories are often unable to organize the flow of products within the factory unless the route is set with an extremely small curve radius, for example, about 5 meters, due to the mutual layout of the factories. As a result, bogies such as the one shown in Figure 1 are now being driven on curves with small radii that would be unimaginable for general rail vehicles.

However, when the trolley shown in FIG. 1 enters a rail with a very small radius, the curved rails shown at 6B are 8A, 8B, and 9A in contrast to the straight rail shown in FIG. 2, 6A.

Due to the action of the guide wheel 9B, the tread surface of the wheel 4 deviates by the dimension shown in Figure 10.

This deviation means that the wheels 4 are forced to skid while the wheels change from a straight road to a curved road, and if the radius of the curve is extremely small, this skid phenomenon causes wheel wear and shortens the life of the wheels. becomes extremely short.

Furthermore, this skidding causes running resistance, requiring a larger running drive device.

An object of the present invention is to provide an extremely small radius traveling bogie structure that does not cause sideslip of the wheels 4t, 5 due to such a curve radius.

FIGS. 3 and 4 show an embodiment of the truck structure of the present invention.

In FIGS. 3 and 4, two truck frames are rotatably attached to the center plate 3, and guide wheels 8A, 8B, 9A, which are rotatable in the vertical direction, are attached to the two truck frames. 9B is attached as in the conventional example.

In the conventional bogie structure, the rail traveling wheels are directly attached to the two bogie frames, but in the present invention, a support shaft 16a, Link 1 rotates laterally around 16b
3, 13, 13.13.

Basically, links 13, 13, 13.13 link wheels 4,
However, depending on the design conditions, the bearing portion 11A,
In some cases, a sliding portion may be provided to restrain 11B in the front and back direction with respect to the two persons on the bogie frame.

The wheels 5 also have a similar configuration.

Moreover, bearing parts 11A, 11B, 12A. A spring 14, 14° 14.14 is arranged between 12B and the two bogie frames.

Moreover, the bearing part 11A. A gap 15A is provided between 11B, 12A, 12B and stoppers 15, 15, 15, 15 provided on the two truck frames.

Generally, the clearance 15A is made slightly larger than the amount of sideways slippage of the wheels when passing through the curve shown at 10 in FIG.

Of course, it goes without saying that the inside of the wheels should be designed so that even when the bearings 11A, 11B come into contact with the stoppers 15, 15, 15, 15, the wheels 4, 5 are sufficiently covered with the rails 6.7. do not have.

Next, this effect will be explained.

When the vehicle travels in a straight line, the wheels 4 and 5 are guide wheels 9A.
, 9B, 8A, 8B at the center of the rail.
Centered at 4, 14, 14.14.

When this vehicle enters a curve, the wheels 4 and 5 must slide sideways against the rail by an amount shown by the reference numeral 10 in FIG. Since the wheels 4 and 5 are supported by the wheels 4 and 5 and are attached to the bogie frame 2A by links 13, 13, 13, 13, the wheels 4 and 5 are displaced without skidding due to the frictional force caused by the lateral slippage.

When the vehicle exits a curve, the wheels 4 and 5 must return to their original positions, but even in this case, instead of overcoming the frictional force and sliding sideways, the restoring force of the springs 14, 14°14.14 causes lateral creep. Restoration is carried out smoothly while this occurs.

The restoring force of the springs 14, 14, 14 is determined as follows so that the lateral displacement when passing a curve is restored by creep before entering the next curve.

If f = 465SrFW f nicreep coefficient D: wheel diameter ml 凰W; wheel weight yf, then lateral displacement when passing through a curve, that is, code 10 in Figure 2
When the value of is δ and the length of the straight line after passing through the curve is Lllm,
In the lateral force, that is, the restoring force Fton due to the spring, f
Since the vehicle moves forward by mt and moves laterally by F-wing and leaping, the restoring force F should be selected so that '=-F>δ.

FIG. 5 is a configuration diagram of main parts showing a modification of the present invention.

Rollers 21 are installed between the bearings 20 of the wheels 4 and 5 and the bogie frame 2B.
This is provided.

In order to perform centering, the seats 22A and 22B have a concave arcuate shape.

If sufficient creep force can be obtained from the restoring force due to the shape of the concave arc surface, the configuration shown in Fig. 5 may be used, but if the creep force is insufficient, a spring etc. may be used as explained in the embodiments of Figs. 3 and 4. If you put it in, you can get enough resilience.

As explained above, the bogie of the present invention avoids lateral displacement between the wheels and the rails in minimal curves by moving the wheels laterally, so the side slip phenomenon can be avoided and the life of the wheels can be extended.

Furthermore, since the restoring force is sufficient to restore the wheels on a straight road until entering the next curve, it can be smaller than the frictional force due to sideslip and no unreasonable force is generated in the bogie components.

Furthermore, it is possible to obtain the effect of eliminating slip noise caused by sideslip.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional trolley for passing through extremely small curves, FIG. 2 is a diagram illustrating sideslip of wheels when passing through a curve, and FIG. 3 is an explanatory diagram showing a conventional trolley for passing through extremely small curves. FIG. 4 is a plan view of the truck, and FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3. FIG. 2.2A, 2B...Bolly frame, 4,5...
- Traveling wheels, 8A, 8B, 9A, 9B... Guide wheels.

Claims (1)

[Claims] 1. In a vehicle bogie that is guided and guided using guide wheels that are spaced apart in the longitudinal direction and rotatable around a vertical axis, the guide wheels are fixed to the bogie frame, and the wheels that run on the rails are fixed to the bogie frame. The vehicle is structured to allow lateral displacement within a range of movement that is slightly larger than the amount of relative displacement equivalent to the amount of wheel skidding on a curved section, and is equipped with a mechanism that generates a restoring force that allows the traveling wheels to creep and recover on a straight section after passing through a curved section. This is an extremely small radius traveling trolley.