JP2675369B2 - Wheel pre-rotating device for magnetically levitated railway vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pre-rotation device for preliminarily rotating wheels of a magnetically levitated railway vehicle prior to grounding.

(Prior Art) Magnetically levitated railway vehicles are generally equipped with wheels for supporting and guiding a vehicle body by grounding it at low speed or at a stop. However, there has been a device for pre-rotating such a wheel prior to grounding. There wasn't.

(Problem of the invention) Since the magnetic levitation force of an induction-repulsion type magnetic levitation railway vehicle decreases at low speed, and the magnetic levitation force is completely lost when the vehicle is stopped, the tire must be supported to support and guide the vehicle body at such time. Equipped with attached wheels. This wheel is attached to the carriage by a supporting leg composed of, for example, a trailing arm, a wheel cushion, and a vertically moving cylinder, so as to be movable between a grounding position and a pulling position.

However, when the vehicle decelerates from the ascending traveling and shifts to the wheel supporting traveling, the wheels which have been stationary until then rotate at a furious speed at the same time as the ground contact. At that time, since there is a large relative velocity between the tire and the contact surface, sliding friction occurs, which has been a factor in accelerating tire wear.

In order to reduce the wear at the time of contact with the ground, the wheels may be rotated prior to contact with the ground to reduce or eliminate the relative speed. As such a pre-rotation device, for example, a bladed wheel in an aircraft is known. However, such an aerodynamic driving method cannot rotate the wheels at a sufficient speed, and the rotation direction is limited to only one direction, so that it is not suitable for a magnetic levitation railway vehicle.

Further, in a magnetically levitated railway vehicle using a superconducting magnet having a strong magnetic field, it has not been possible to pre-rotate wheels by using an electric motor.

The present invention has been made in view of the above problems, and provides a pre-rotation device capable of rotating a wheel of a magnetic levitation railway vehicle at a sufficient speed in both forward and reverse directions before grounding. With the goal.

(Means for Achieving the Object) The present invention relates to a wheel device for a magnetic levitation railway vehicle, which displaces a wheel supported by a trailing arm swingably connected to a bogie between a grounding position and a pulling position. ,
A roller that is rotatably supported by a swing link that is swingably attached to a carriage, a hydraulic motor that drives the roller to rotate, and a hydraulic cylinder that holds the roller in contact with the wheel at the pulling position via the swing link. And a wheel pre-rotation device.

(Operation) The hydraulic cylinder operates the swing link around the axis to bring the roller supported by the swing link into contact with the wheel at the pulling position. The hydraulic motor rotatably drives this roller to pre-rotate the wheels contacting the roller. The wheels rotate in any direction and at any speed in response to the supply of hydraulic oil from the hydraulic source to the hydraulic motor.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a wheel fitted with a tire, which is rotatably supported by an intermediate portion of a trailing arm 3 which is swingably connected to a carriage 2 via an axle 1A. At the tip of the trailing arm 3 which is bent obliquely downward, a wheel cushion for cushioning and vertically acting the wheel 1 and a piston rod 5 of a vertically elevating cylinder 4 are hingedly coupled.

The wheel cushion and the cylinder tube 13 of the vertical lifting cylinder 4 are hinged to the bracket 6 fixed to the carriage 2, and in the contracted state, the tip end of the trailing arm 3 is pulled upward together with the wheel 1 as shown in FIG. Wheels raised). Further, in the extended state, as shown in FIG. 2, the piston rod 5 is pushed out, and the wheel 1 is held in the grounded state via the trailing arm 3 whose tip is swung downward (wheel running state).

A pre-rotation device having the following configuration is further provided between the wheel 1 and the carriage 2. That is, the swing link 7 is attached to the carriage 2.
The base end of the roller is hinged, and the roller 8 is attached to the tip of the swing link 7.
Is rotatably supported. A hydraulic motor 9 coupled to the rotary shaft of the roller 8 is attached to the tip of the swing link 7, and a piston rod 11 of a hydraulic cylinder 10 is hingedly coupled. This hydraulic cylinder 10 is hinged to the carriage 2 via a cylinder tube 12, and in a contracted state, the swing link 7 is pulled toward the hydraulic cylinder 10 side to hold the roller 8 at a position apart from the wheel 1 in the pulling up position. .
In the extended state, the roller 8 is brought into contact with the tire portion of the wheel 1 in the pulling up position via the swing link 7. It should be noted that all of the wheel cushioning and vertical lifting cylinder 4, the hydraulic motor 9, and the hydraulic cylinder 10 are driven by pressure oil supplied from a hydraulic pressure supply device such as a hydraulic pump provided on the vehicle.

 Next, the operation will be described.

In the high-speed floating traveling state, the wheel cushion and the vertically elevating cylinder 4 are in the contracted state, and the wheel 1 is held in the pulling position shown in FIG. On the other hand, the hydraulic cylinder 10 is also contracting,
The roller 8 is held at a position apart from the wheel 1 as shown by the chain line in FIG.

In the process of decelerating the vehicle from this state, if the pre-rotation command is issued before the wheel 1 comes into contact with the ground, the hydraulic cylinder
10 extends and pushes the swing link 7 around the hinge, and the roller 8 contacts the tire portion of the wheel 1 in the pulling position as shown by the solid line in FIG. Then, the operation of the hydraulic motor 9 is started, and the roller 8 is rotationally driven. As a result, the wheels 1 contacting the rollers 8 start to rotate.

When the ground contact command for the wheel 1 is issued, the wheel cushioning and vertical lifting cylinder 4 extends, the piston rod 5 pivots the trailing arm 3 obliquely downward, and the wheel 1 grounds as shown in FIG. Incidentally, the hydraulic cylinder 10 contracts in accordance with the ground contact command to rotate the roller 8 to the original position (the position indicated by the chain line in FIG. 1), and the operation of the hydraulic motor 9 is also stopped.

Since the grounded wheel 1 is preliminarily rotating, sliding friction due to a large relative velocity does not occur between the tire and the grounding surface at the moment of grounding, and the wheel 1 smoothly supports and guides the vehicle immediately after grounding. Therefore, wear of the tire due to repeated ground contact is extremely reduced.

Since the wheel 1 can be pre-rotated in any of the front and rear directions by selecting the supply direction of the pressure oil to the hydraulic motor 9, the preferable action can be obtained regardless of the traveling direction of the vehicle. . Further, since the hydraulic pressure is used, the rotational force can be easily controlled, and there is no concern that the operation will be disturbed even under the influence of a magnetic field.

When shifting from wheel-supporting traveling to levitating traveling, the wheel cushion and the vertical lifting cylinder 4 contract based on the command to pull up the wheel 1, the trailing arm 3 rotates upward, and the wheel 1 is shown in FIG. It is pulled up to the raised position.
Since the roller 8 is held at the position shown by the chain line in FIG. 1 at this time, there is no possibility that the wheel 1 pulled up will contact the roller 8.

(Effects of the Invention) As described above, the wheel pre-rotating device of the present invention is arranged such that the roller supported by the swing link, the hydraulic motor for rotating the roller, and the swing link are rotated to raise the roller. Since it is provided with a hydraulic cylinder that contacts and holds the wheels, the wheels can be preliminarily rotated according to the traveling direction before touchdown. Therefore, the sliding friction due to the relative speed between the wheel and the contact surface at the time of contact with the ground is extremely small, and there is an effect that wear of the tire of the wheel is suppressed and durability is improved.

Also, since the roller is driven to rotate using a hydraulic motor, the roller can be driven to rotate in two directions simply by switching the connection direction of the hydraulic pressure, and sufficient rotation is possible according to the hydraulic pressure supplied to the hydraulic motor. You can get the power. Furthermore, since hydraulic pressure is used as a power source, it operates without any problem even under the influence of a magnetic field. Therefore, the pre-rotation device is extremely suitable for the wheel device of the magnetically levitated railway vehicle.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel device having a pre-rotation device according to an embodiment of the present invention in a raised position, and FIG. 2 is a side view of the same in a grounded position. 1 ... Wheels, 1A ... Axle, 2 ... Truck, 3 ... Trailing arm, 4 ... Wheel cushion and vertical lifting cylinder, 5,
11 …… Piston rod, 6 …… Bracket, 7 …… Swing link, 8 …… Roller, 9 …… Hydraulic motor, 10 …… Hydraulic cylinder, 12,13 …… Cylinder tube.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigeru Ariki 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kabaya Industry Co., Ltd.

Claims (1)

(57) [Claims] 1. A wheel apparatus for a magnetically levitated railway vehicle, wherein a wheel supported by a trailing arm swingably connected to a bogie is displaced between a grounding position and a pulling position.
A roller that is rotatably supported by a swing link that is swingably attached to a dolly, a hydraulic motor that drives the roller to rotate, and a hydraulic cylinder that holds the roller in contact with the wheel at the pull-up position via the swing link. Wheel pre-rotation device for magnetically levitated railway vehicles.