JP3457352B2 - Wheel device for magnetic levitation vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a traveling wheel device provided in a magnetic levitation type railway vehicle. 2. Description of the Related Art An induction-repellent magnetic levitation type vehicle is provided with wheels with tires for supporting and guiding the vehicle body at a low speed or at a stop. The wheel 40 shown in FIG.
Here, the axle 40A is supported by a bogie 41 attached to the vehicle body via a trailing arm 43 so as to be freely swingable in the vertical direction. [0005] 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 the carriage 41 and a hinge 48 connecting the link 49 and the cushion unit 46. The cushion unit 46 is composed of a hydraulic damper in which gas is sealed, and is constantly urged in the extension direction by gas pressure. The wheel 40 is lifted from the traveling road surface 51 to the retracted position by driving the hydraulic cylinder 47 to extend as shown in FIG. 4 (b) during the levitating traveling. As shown in the figure, the hydraulic cylinder 47 extends to descend from the storage position and touch the ground on the traveling road surface 51,
Perform wheel running. [0005] In the case of this wheel device, the number of parts is large, a large dedicated space is required for operation, and there are many nodes, so that friction resistance and vibration are large. there were. The present invention has been made to solve the above problems, and an object of the present invention is to provide a wheel device of a magnetic levitation type vehicle which has a simple structure and can be operated in a small space. According to the present invention, a wheel is swingably supported on a vehicle body via a trailing arm, and a telescopic cylinder and compressed gas are sealed between the trailing arm and the vehicle body. A cushion unit is interposed in series, and the telescopic cylinder is a piston
Ton in the cylinder tube so that it can slide freely.
Rod protrudes freely from cylinder tube in the axial direction
Oil chamber that drives the piston in the extension and contraction directions
Are formed inside the cylinder tube, respectively.
Into the lock groove formed on the inner circumference of the cylinder tube
The axial displacement of the piston to the predetermined contraction position.
The first lock segment that locks to
The second lock locks the ton axial displacement at a predetermined extension position.
To the oil chamber that drives the piston in the contraction direction
The first lock segment in the extended position according to the hydraulic pressure supply
A first lock release mechanism that retracts from the lock groove, and a fixie
Contracts in response to hydraulic pressure supplied to the oil chamber that drives the
The second lock segment in position from the lock groove
A second lock release mechanism is provided on the piston to release the first lock.
The first lock segment at the lock position
The first sub-piston that locks back
The door is slidably housed, and its lock is used as a second lock release mechanism.
Lock the retraction of the second lock segment at the lock position
The sub piston is slidably housed inside the piston,
Spring between one sub piston and second sub piston
It is installed in a compressed state, and the biasing force of this spring
Lock the first sub piston or the second sub piston
The first lock segment and the second lock segment.
The piston in the direction perpendicular to the center axis of the piston.
Through the first lock segment through the tapered surface.
Lock position following the axial displacement of the first sub piston
And the second lock segment is tapered
Following the axial displacement of the second sub-piston through the
The first sub is cylindrical and has a bottom.
Cylindrical second sub-bottom with a piston opening toward the oil chamber
Freely slidably fitted to the inner circumference of the piston and the inner circumference of the piston
Between the first and second sub-pistons
The first back pressure chamber that communicates with the oil chamber that drives the
Between the first and second sub-pistons
A second back pressure chamber which communicates tons oil chamber drive to the expansion direction
It shall be formed . By locking the axial displacement of the piston at the extension position and the contraction position of the telescopic cylinder, the trailing arm connected to the telescopic cylinder via the cushion unit moves the wheel to the predetermined raised position and lowered position. I support. Further, by releasing the lock and extending and retracting the telescopic cylinder, the trailing arm rotates, and the wheel is raised and lowered between the raised position and the lowered position. [0009] In addition, a cushion unit interposed between the trailing arm and the telescopic cylinder absorbs vibrations and shocks of the wheels during wheel running. 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 at the tip of a trailing arm 43. The base end of the trailing arm 43 is swingably connected to the vehicle body 50. Then, the composite cylinder 44 connects the hinge 52 at the tip of the trailing arm 43 to the vehicle body 51. As shown in FIG. 3, the composite cylinder 44 has a telescopic cylinder 45 and a cushion unit 16 connected in series.
It has a piston 2 slidably housed inside thereof and a piston rod 3 connected to the piston 2 and protruding from the cylinder tube 1. The inside of the cylinder tube 1 is defined by a piston 2 in an oil chamber 5 on the side opposite to the oil chamber 4 on the piston rod 3 side. The oil chamber 4 communicates with a port 11 formed in the cylinder tube 1, and the oil chamber 5 communicates with a port 1 formed in an end cap 25 that seals 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 has a piston body 2C formed integrally with the piston rod 3, and sub-pistons 2A and 2B housed inside the piston body 2 so as to be freely slidable in the axial direction. The piston main body 2C is formed in a cylindrical shape that opens toward the oil chamber 5, and its 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 the open end is slidably fitted to the inside of the sub-piston 2A. The base end of the sub-piston 2B is formed to have a larger diameter than the front end, and slides on the inner periphery of the piston main body 2C. The sub-pistons 2A and 2B are urged away from each other by a spring 6 disposed in an oil chamber 8 formed inside the sub-pistons. An orifice 7 is provided at the bottom of the sub-piston 2A.
Is formed, and the oil chamber 8 always communicates with the oil chamber 4 through the orifice 7 and a through hole 26 formed at the base end of the piston main body 2C. Further, a through hole 9 is formed through the base of the sub piston 2B in sliding contact with the piston body 2C.
This sliding contact portion, the outer periphery of the sub piston 2B and the sub piston 2
The oil chamber 10 having an annular cross-section surrounded by the tip of A and the inner peripheral part of the piston body 2C is always in communication with the oil chamber 5 through the through hole 9. Holes penetrating through the wall surface are provided at the distal end and the proximal end of the piston main body 2C, respectively. Fits freely in sliding. The transverse dimension of each of the lock segments 13 and 14 is longer than the wall thickness of the piston body 2C.
Therefore, one ends of these lock segments 13 and 14 always protrude inside or outside the piston body 2C. The lock segment 13 on the distal end side is formed with a tapered surface inclined outwardly in the direction in which the piston 2 extends. The lock segment 14 on the proximal end side is formed with a tapered surface inclined outward in the contraction direction of the piston 2. On the other hand, at the base end of the sub-piston 2A, a tapered surface abutting on the lock segment 14 inside the piston main body 2C is formed in the extension direction of the piston 2. Further, a tapered surface that abuts on the lock segment 13 inside the piston body 2C is formed at the base end of the sub-piston 2B in the contraction direction of the piston 2. A lock groove 30 for receiving the lock segment 13 is formed on the inner peripheral surface at the base end of the cylinder tube 1. Similarly, a lock groove 31 for receiving the lock segment 14 is formed at the tip of the cylinder tube 1. The piston rod 3 protrudes freely 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 projection. 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 on the outer periphery of the piston ram 17 via a guide 19. Ram cylinder 1
The inside of the piston ram 17 is provided with a cap 20 attached to the tip of the piston ram 17 inside the chamber 2.
1 and an outer chamber 22 are defined. These chambers 21 and 22 communicate with each other by an orifice 23 formed in the cap 20. An eye 2 for connecting to the trailing arm 43 via a hinge 52 is provided at the base end of the ram cylinder 18.
4 are formed. 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 to 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 contracted position, and the lock segment 13 has entered the lock groove 30. In the retracted position, the trailing arm pivots upward at its tip, as shown by the chain line in FIG. 1, and holds the wheel 40 in the raised position. In this state, an extension load is applied to the telescopic cylinder 45 by the weight of the wheels and the trailing arm.
However, since the lock segment 13 has entered the lock groove 30 and the displacement of the lock segment 13 in the center direction is regulated by the sub-piston 2B, the displacement of the piston 2 in the extension direction is locked, and the wheel 40 It is held in the raised position. During the ascent, the wheels 40 are stored in the raised position in this manner. When running on wheels, the telescopic cylinder 4
5. Connect port 12 of 5 to the hydraulic pump and port 11 to the tank. Then, the sub-piston 2B first slides downward in FIG. 3 by the hydraulic pressure acting on the oil chamber 5 via the port 12. On the other hand, the downward displacement of the sub-piston 2A is restricted by the lock segment 14, so that the oil chamber 8 contracts against the spring 6 and the sub-piston 2B enters the sub-piston 2A. The contracting hydraulic oil in the oil chamber 8 flows out of the port 11 through 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 toward the center, and the lock piston 13 has a tapered surface against the action of the force in the extension direction. Displaced toward the center while sliding. Due to this displacement, the lock of the piston body 2C against the extension displacement is released, and thereafter, the entire piston 2 is displaced in the extension direction in accordance with 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 the tip, and lowers the wheels 40 to the traveling road surface 51. The displacement of the piston 2 in the extending direction stops when the lock segment 14 enters the lock groove 31. During the extension displacement of the piston 2, the load by the spring 6 acts on the sub-piston 2A in the downward direction, 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 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 drawing, and supports the lock segment 14 in a state of being pushed outward by the outer peripheral portion having a large diameter above the tapered surface. Thus, the telescopic cylinder 45 is locked in the extended position, and the wheel 40 is supported in the ground position as shown by the solid line in FIGS. Thus, the wheels run. The vibration and shock of the running wheels 40 are absorbed by the gas spring function of the compressed gas sealed in the cushion unit 16 and the damping action provided by the orifice 7 built in the cushion unit 16. When shifting from wheel running to levitating running,
Supply hydraulic oil 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 to the sub piston 2A through the through hole 26 and the orifice 7.
Acts on both sides. The sub-piston 2A is urged upward in the figure due to the pressure receiving area difference, and opposes the spring 6 to the oil chamber 8
While sliding upward. Thereby, the lock of the lock segment 14 is released, and the lock segment 14 is displaced in the center direction. As a result, the displacement of the piston body 2C in the contraction direction becomes possible, and the entire piston 2 slides upward in the drawing to contract the piston rod 3 in accordance with the supply of the hydraulic oil to the oil chamber 4, and the cushion is moved. Unit 16
Pull up the wheel 40 supported by. During this time, since the lock segment 13 is urged outward through the tapered surface at the base end of the sub-piston 2B, when the piston rod 3 contracts to the position shown in FIG. Invade. 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. Thereby, the wheel 40 is held at the raised position. In this manner, the piston 2 is automatically positioned at the contracted position and the extended position and locked thereon, and supplies hydraulic pressure in the extended direction at the retracted position and in the retracted direction at the extended position. Only this unlocks. That is, locking and unlocking can be performed easily and reliably without any need for locking and unlocking operations. Further, since the locking member and the unlocking member are not exposed outside the cylinder tube 1, there is no possibility that these members may be damaged during traveling. As described above, according to the present invention, a telescopic cylinder and a cushion unit filled with compressed gas are interposed between a trailing arm supporting wheels and a vehicle body in series.
A mechanism for locking the axial displacement of the piston between the predetermined extension position and the contraction position and a mechanism for releasing these locks are provided inside the telescopic cylinder. Position and can be supported. Further, since the lock mechanism and the lock release mechanism are not exposed to the outside, there is no danger that they will be damaged during traveling, and maintenance and inspection will be easy. 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 operation is greatly simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a wheel device of a magnetic levitation type 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. 4A and 4B are side views of a wheel device of a magnetic levitation type vehicle showing a conventional example, in which FIG. 4A shows a traveling state of a wheel, and FIG. [Description of Signs] 2A, 2B Sub-piston 13, 14 Lock segment 16 Cushion unit 40 Wheel 43 Trailing arm 45 Telescopic cylinder 50 Body

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Oshima 1-1-4 Meieki Station, Nakamura-ku, Nagoya City, Aichi Prefecture Tokai Passenger Railway Co., Ltd. Chome 1-1109 (72) Inventor Tomio Nakagawa 1-12-1 Asazodai, Sagamihara-shi, Kanagawa Kayaba Industry Co., Ltd. Sagami Factory (56) References JP-A-4-126655 (JP, A) −108476 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B61B 13/08 B60L 13/04 B61F 13/00 F15B 15/22 F15B 15/26

Claims (1)

(1) A cushion unit in which wheels are swingably supported on a vehicle body via a trailing arm, and a telescopic cylinder and compressed gas are sealed between the trailing arm and the vehicle body. And the telescopic cylinder is
Piston with stone rod connected to cylinder tube
The piston rod is housed in the cylinder tube with sliding freedom.
To slide freely in the axial direction from the
And the oil chamber driven in the contraction direction is placed inside the cylinder tube.
And the inner circumference of the cylinder tube
Penetrating into the lock groove formed in the piston shaft
First lock segment to lock the directional displacement in the predetermined contraction position
In the same way as the
The second lock segment to lock in position and the piston
Extension position according to hydraulic pressure supply to oil chamber driven in contraction direction
The first lock segment is retracted from the lock groove.
Lock release mechanism and oil chamber to drive piston in extension direction
Second lock segment in retracted position in response to hydraulic pressure supply to
And a second lock release mechanism that retracts the lock from the lock groove.
The lock position as the first lock release mechanism.
To lock the retraction of the first lock segment
The stone is slidably housed inside the piston, and the second lock
The second lock segment at the lock position as a lock release mechanism
The second sub-piston that locks the
The first sub-piston and the second sub-pi
Interposed between the stons with the spring compressed
The first sub piston or the second
Hold the two sub pistons in the lock position and
To the piston and its center axis
To the first lock set.
Axially of the first sub-piston through the tapered surface
It is configured to displace to the lock position following the displacement,
Lock segment is tapered through second sub-piston
To be displaced to the locked position following the axial displacement of
And open the bottomed cylindrical first sub-piston toward the oil chamber.
Inner circumference of the bottomed cylindrical second sub-piston and piston
The first sub piston and the second sub piston
Oil chamber that drives piston in the contraction direction between sub-pistons
A first back pressure chamber communicating with the first sub-piston and the
Oil that drives the piston in the extension direction between the two sub pistons
A wheel device for a magnetic levitation vehicle, wherein a second back pressure chamber communicating with the chamber is formed .