JPH06316261A - Wheel device of magnetic levitational vehicle - Google Patents

Abstract

PURPOSE:To enable it to support a wheel at the specified position through a simple structure by interposing an expansion cylinder and a cushion unit between a trailing arm supporting the wheel free of rocking motion and a car body, and installing a mechanism locking an axial displacement and its releasing mechanism both in this expansion cylinder. CONSTITUTION:A wheel 40 is supported on a car body 50 free of rocking motion via a trailing arm 43, and an expansion cylinder and a compressed gas-filled cushion unit 16 both are interposed between the trailing arm 43 and the car body 50 in series. In addition, two segments 13 and 14 are installed in an inner part of this expansion cylinder as a mechanism locking the axial displacement of a piston 2 at both the expansion and contraction positions, through which the wheel 40 is locked to a lifting position and a traveling road surface (51) position. At the time of being locked, two subpistons 2B and 2A are displaced to some extent and operates as a lock releasing mechanism only when hydraulic pressure is supplied in an extension direction at the contraction position and in a contraction direction at the extension position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a traveling wheel device for a magnetically levitated railway vehicle.

[0002]

2. Description of the Related Art A magnetically levitated vehicle of induction repulsion type is provided with wheels with tires for supporting and guiding the vehicle body at low speed or at a stop. The wheel 40 shown in FIG. 4 (a) is an example,
Here, an axle 40A is supported by a dolly 41 mounted on a vehicle body via a trailing arm 43 so as to be vertically swingable.

The trailing arm 43 is supported by a cushion unit 46. The cushion unit 46 is connected to the carriage 41 via a link 49, and a telescopic cylinder 47 is interposed between a hinge 48 connecting the link 49 and the cushion unit 46 and the carriage 41. The cushion unit 46 is composed of a hydraulic damper in which gas is enclosed, and is constantly urged in the extension direction by the gas pressure.

The wheel 40 is lifted from the traveling road surface 51 to the retracted position by extending and driving the hydraulic cylinder 47 as shown in FIG. 4 (b) during floating operation, and when the traveling speed falls below a certain level, FIG. 4 (a). As shown in, the hydraulic cylinder 47 is extended to descend from the retracted position and contact the traveling road surface 51,
Drive the wheels.

[0005]

In the case of this wheel device, there are problems that the number of parts is large, a large dedicated space is required for the operation, and the number of nodes is large, so that frictional resistance and vibration are large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wheel device for a magnetic levitation vehicle, which has a simple structure and can operate in a small space.

[0007]

According to the present invention, there is provided a cushion unit in which a wheel is swingably supported on a vehicle body via a trailing arm, and a telescopic cylinder and a compressed gas are sealed between the trailing arm and the vehicle body. And a mechanism that locks the axial displacement of the piston at a predetermined extended position and a contracted position inside the telescopic cylinder, and a mechanism that releases these locks.

[0008]

By locking the axial displacement of the piston at the extended position and the contracted position of the telescopic cylinder, the trailing arm connected to the telescopic cylinder via the cushion unit supports the wheel at predetermined rising and lowering positions. . Further, by unlocking and extending and contracting the telescopic cylinder, the trailing arm rotates to raise and lower the wheel between the raised position and the lowered position.

Further, during traveling of the wheels, a cushion unit interposed between the trailing arm and the telescopic cylinder absorbs vibration and impact of the wheels.

[0010]

1 to 3 show an embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 40 denotes a wheel of a magnetically levitated vehicle, which is rotatably supported by the tip of a trailing arm 43. The base end of the trailing arm 43 is swingably connected to the vehicle body 50.

The composite cylinder 44 connects the hinge 52 at the tip of the trailing arm 43 and the vehicle body 51.

As shown in FIG. 3, the composite cylinder 44 comprises a telescopic cylinder 45 and a cushion unit 16, which are connected in series. The telescopic cylinder 45 is connected to the cylinder tube 1.
A piston 2 slidably accommodated inside thereof and a piston rod 3 which is coupled to the piston 2 and projects from the cylinder tube 1 are provided.

The inside of the cylinder tube 1 is defined by a piston 2 into an oil chamber 5 on the piston rod 3 side and an oil chamber 5 on the opposite side.

The oil chamber 4 communicates with a port 11 formed in the cylinder tube 1, and the oil chamber 5 has a port 1 formed in an end cap 25 for sealing the base end of the cylinder tube 1.
Connect to 2. These ports 11 and 12 are selectively connected to a hydraulic pump and a tank (not shown).

The piston 2 is provided with a piston body 2C integrally formed with the piston rod 3 and sub-pistons 2A and 2B which are accommodated inside the piston body 2C so as to freely slide in the axial direction.

The piston body 2C is formed in a cylindrical shape that opens toward the oil chamber 5, and the outer peripheral portion is in sliding contact with the inner peripheral portion of the cylinder tube 1.

The sub-piston 2A is fitted to the inner peripheral portion of the piston body 2C with its tip open toward the oil chamber 5,
Similarly, the sub-piston 2B having an open tip is slidably fitted inside the sub-piston 2A. The base end of the sub-piston 2B is formed to have a larger diameter than the tip, and is in sliding contact with the inner circumference of the piston body 2C.

The sub-pistons 2A and 2B are urged in a separating direction from each other by a spring 6 arranged in an oil chamber 8 formed inside them.

An orifice 7 is provided at the bottom of the sub piston 2A.
The oil chamber 8 is always communicated with the oil chamber 4 through the orifice 7 and the through hole 26 formed at the base end of the piston body 2C.

A through hole 9 is formed longitudinally through the sliding contact portion of the base end of the sub piston 2B with the piston body 2C.
The sliding contact portion, the outer circumference of the sub piston 2B, and the sub piston 2
An oil chamber 10 having an annular cross section surrounded by the tip of A and the inner peripheral portion of the piston main body 2C is always communicated with the oil chamber 5 through the through hole 9.

Holes penetrating the wall surface are provided at the front end and the base end of the piston body 2C, and the lock segments 13 and 14 are provided inside these holes at right angles to the central axis of the piston 2, respectively. Fits freely sliding.

The transverse dimensions of the lock segments 13 and 14 are both longer than the wall thickness of the piston body 2C,
Therefore, one end of each of these lock segments 13 and 14 always projects inside or outside the piston body 2C.

The lock segment 13 on the distal end side is formed with a taper surface which is inclined outward in the extending direction of the piston 2. Further, the lock segment 14 on the base end side is formed with a taper surface which is inclined outward in the contracting direction of the piston 2.

On the other hand, at the base end of the sub-piston 2A, a taper surface that abuts the lock segment 14 inside the piston body 2C is formed in the extending direction of the piston 2. In addition, a tapered surface that abuts the lock segment 13 inside the piston body 2C is formed at the base end of the sub-piston 2B toward the contracting direction of the piston 2.

A lock groove 30 for receiving the lock segment 13 is formed on the inner peripheral surface of the base end of the cylinder tube 1. A lock groove 31 for receiving the lock segment 14 is also formed at the tip of the cylinder tube 1.

The piston rod 3 is slidably protruded from the cylinder tube 1 via a bearing 15 provided at the tip of the cylinder tube 1. And the piston rod 3
The cushion unit 16 is attached to this protruding portion.

The cushion unit 16 has a bottomed cylindrical piston ram 17 connected to the end of the piston rod 3.
A ram cylinder 18 is slidably fitted to the outer periphery of the piston ram 17 via a guide 19. Ram cylinder 1
A cap 20 attached to the tip of the piston ram 17 allows the chamber 2 inside the piston ram 17 to
1 and an outer chamber 22 is defined. These chambers 21 and 22 communicate with each other through an orifice 23 formed in the cap 20.

At the base end of the ram cylinder 18, an eye 2 for connecting to a trailing arm 43 via a hinge 52.
4 is formed.

Compressed gas is filled in the chambers 21 and 22, and when the piston ram 17 enters the ram cylinder 18, the chamber 21 contracts, and a part of the compressed gas in the chamber 21 passes through the orifice 23 and enters the chamber 22. Inflow.

With this configuration, the cushion unit 16
Has a vibration damping function by the orifice 23 in addition to the gas spring function of the compressed gas.

Next, the operation will be described.

In FIG. 3, the telescopic cylinder 45 is in the retracted position, and the lock segment 13 has entered the lock groove 30.

In this contracted position, the trailing arm rotates its tip upward as shown by the chain line in FIG. 1 to hold the wheel 40 in the raised position.

In this state, an extension load due to the weight of the wheels and trailing arm acts on the telescopic cylinder 45.
However, since the lock segment 13 enters the lock groove 30 and the displacement of the lock segment 13 in the center direction is restricted by the sub-piston 2B, the displacement of the piston 2 in the extension direction is locked and the wheel 40 is Holds in the raised position. The wheels 40 are thus stored in the lifted position during levitation.

When the wheels are run, the telescopic cylinder 4
Connect port 12 of 5 to the hydraulic pump and port 11 to the tank.

Then, the hydraulic pressure acting on the oil chamber 5 through the port 12 first causes the sub-piston 2B to slide downward in FIG. On the other hand, since the downward displacement of the sub piston 2A is restricted by the lock segment 14, the oil chamber 8 contracts against the spring 6 as a result, and the sub piston 2B enters the sub piston 2A. The hydraulic oil in the contracting oil chamber 8 flows out from the port 11 via the orifice 7, the through hole 26 and the oil chamber 4.

As a result, when the base of the sub-piston 2B moves below the lock piston 13, the lock piston 13 can be displaced in the central direction, and the lock piston 13 has a tapered surface against the action of force in the extension direction. It is displaced toward the center while sliding. By this displacement, the lock of the piston main body portion 2C against the extension displacement is released, and thereafter, the entire piston 2 is displaced in the extension direction according to the supply of the hydraulic oil to the oil chamber 5, and the piston rod 3 is extended. As a result, the trailing arm 43 pivots downward at its tip, and the wheels 40 are lowered to the traveling road surface 51.

The displacement of the piston 2 in the extension direction is stopped when the lock segment 14 enters the lock groove 31. During extensional displacement of the piston 2, the load by the spring 6 acts on the sub-piston 2A downward in the figure, and the lock segment 14 is constantly urged outward by the tapered surface formed at the base end of the sub-piston 2A.

Therefore, when the lock segment 14 reaches the front surface of the lock groove 31, the lock segment 14 is displaced outward and enters the lock groove 31. Along with this, the sub-piston 2A biased by the spring 6 is displaced downward in the figure, and the outer peripheral portion having a large diameter above the tapered surface supports the lock segment 14 in a state of being pushed outward. This locks the telescopic cylinder 45 in the extended position and the wheel 40 is supported in the grounded position as shown by the solid lines in FIGS.

As a result, wheel traveling is performed. Vibrations and impacts of the running wheels 40 are absorbed by the gas spring function of the compressed gas enclosed in the cushion unit 16 and the damping action provided by the orifice 7 built in the cushion unit 16.

When shifting from wheel traveling to levitating traveling,
Supply hydraulic fluid to port 11 and connect port 12 to the tank.

The hydraulic pressure acting on the oil chamber 4 through the port 11 is transmitted through the through hole 26 and the orifice 7 to the sub piston 2A.
Acts on both sides of. The sub-piston 2A is urged upward in the drawing due to the difference in pressure receiving area and resists the spring 6 to cause the oil chamber 8
Slide upward while contracting. As a result, the lock of the lock segment 14 is released, and the lock segment 14 is displaced in the center direction. As a result, the piston body 2C can be displaced in the contraction direction, and the piston 2 as a whole slides upward in the drawing in response to the supply of the hydraulic oil to the oil chamber 4 to contract the piston rod 3 and the cushion. Unit 16
The wheel 40 supported by is pulled up.

During this time, the lock segment 13 is urged outward through the taper surface at the base end of the sub-piston 2B. Therefore, when the piston rod 3 contracts to the position shown in the figure, the lock segment 13 is locked again in the lock groove 30. Break into. Further, the sub-piston 2A slides upward inside the piston main body 2C by the pressure of the oil chamber 8 and the repulsive force of the spring 6, and locks the displacement of the lock segment 13 toward the center as shown in the figure. As a result, the wheel 40 is held in the pulling position.

In this way, the piston 2 is automatically positioned at the contracted position and the extended position, locked on it, and supplied with hydraulic pressure in the contracted position in the extending direction and in the expanding position in the contracting direction. Only this unlocks. That is, locking and unlocking can be easily and reliably performed without requiring any locking and unlocking operations. Further, since the locking member and the unlocking member are not exposed to the outside of the cylinder tube 1, there is no possibility of damaging these members during traveling.

[0046]

As described above, according to the present invention, the telescopic cylinder and the cushion unit containing the compressed gas are interposed in series between the trailing arm for supporting the wheel and the vehicle body,
Since the mechanism for locking the axial displacement of the piston at the predetermined extended position and the contracted position and the mechanism for releasing these locks are provided inside the telescopic cylinder, the wheel can be moved to the predetermined raised position and the lowered position with a simple structure. Can be supported in any position.

Further, since the lock mechanism and the lock release mechanism are not exposed to the outside, there is no fear of damage to them during traveling, and maintenance and inspection is facilitated.

Further, since the main members are only the telescopic cylinder and the trailing arm to which the cushion unit is previously connected, the mounting space can be saved and the mounting work can be greatly simplified.

[Brief description of drawings]

FIG. 1 is a side view of a wheel device of a magnetic levitation railway vehicle showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a vertical sectional view of a telescopic cylinder and a cushion unit.

FIG. 4 is a side view of a wheel device of a magnetically levitated vehicle showing a conventional example, in which (a) shows wheel traveling and (b) shows levitating traveling.

[Explanation of symbols]

 2A, 2B Sub-piston 13,14 Lock segment 16 Cushion unit 40 Wheels 43 Trailing arm 45 Telescopic cylinder 50 Vehicle body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motohito Igarashi, 1-4-1, Mei Station, Nakamura-ku, Nagoya-shi, Aichi Tokai Passenger Railway Co., Ltd. (72) Hiroshi Oshima Mei Station, Nakamura-ku, Nagoya-shi, Aichi 1-4-1 Tokai Passenger Railway Co., Ltd. (72) Inventor Too Sakamoto 5-109 Shimaya, Konohana-ku, Osaka-shi, Osaka Prefecture (72) Inventor Tomio Nakagawa 1-12-1 Asamizodai, Sagamihara-shi, Kanagawa Prefecture No. Kayaba Industry Co., Ltd. Sagami Factory

Claims (1)

[Claims] 1. A wheel is swingably supported on a vehicle body via a trailing arm, and a telescopic cylinder and a cushion unit filled with compressed gas are provided in series between the trailing arm and the vehicle body, and A wheel device for a magnetic levitation vehicle, comprising a mechanism for locking the axial displacement of the piston at a predetermined extended position and a contracted position inside the telescopic cylinder, and a mechanism for releasing these locks.