WO2024024136A1

WO2024024136A1 - Truck

Info

Publication number: WO2024024136A1
Application number: PCT/JP2023/005703
Authority: WO
Inventors: 浩幸河野; 篤湯下; 浩二内田; 俊朗浅野間; 康隆福家; 光史谷本; 雪秀矢延; 真史中窪
Original assignee: 三菱重工業株式会社
Priority date: 2022-07-26
Filing date: 2023-02-17
Publication date: 2024-02-01
Also published as: JP2024016566A

Abstract

This truck comprises: a truck frame; an axle which is positioned under the truck frame and extends in the horizontal direction; a motor which is provided so as to be displaceable in the up-down direction relative to the truck frame, and that rotates the axle about the axis of the axle; a power transmission coupling that coaxially links the axle and the drive shaft of the motor; a motor bracket which is provided on the outer surface of the motor, protrudes from the outer surface, and extends in the horizontal direction; a connecting portion that connects the truck frame and the motor bracket in the up-down direction, and varies the position of the motor bracket in the up-down direction with respect to the truck frame; and an up-down position holding mechanism that regulates the operation of the connecting portion varying the position of the motor bracket in the up-down direction.

Description

trolley

The present disclosure relates to a trolley.
This application claims priority to Japanese Patent Application No. 2022-118798 filed in Japan on July 26, 2022, the contents of which are incorporated herein.

Patent Document 1 discloses a direct-drive electric bogie for railway vehicles that has a structure that directly transmits the torque of a motor to an axle. This truck includes a truck frame that fixedly supports the motor.

Japanese Patent Application Publication No. 11-301471

By the way, for example, when a passenger gets on or off the vehicle, the weight of the truck frame changes, causing the truck frame to move up and down. In the truck described in Patent Document 1, the motor is displaced as the truck frame moves up and down, resulting in relative displacement of the motor with respect to the axle. Relative displacement of the motor with respect to the axle causes a decrease in power transmission efficiency and an increase in vibration during driving.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide a truck that can absorb the relative displacement of the motor with respect to the axle.

In order to solve the above problems, a truck according to the present disclosure includes a truck frame, an axle located below the truck frame and extending in the horizontal direction, and a truck that is displaceable relative to the truck frame in the vertical direction. a motor that rotates the axle around the axis of the axle; a power transmission joint that coaxially connects the axle and the drive shaft of the motor; and a power transmission joint that is provided on an outer surface of the motor and protrudes from the outer surface in a horizontal direction. a motor bracket that extends to the dolly frame; a connection portion that vertically connects the bogie frame and the motor bracket to change the vertical position of the motor bracket with respect to the bogie frame; and a vertical position of the motor bracket. and a vertical position holding mechanism that defines an operation of the connecting portion to change the position.

According to the truck of the present disclosure, relative displacement of the motor with respect to the axle can be absorbed.

FIG. 1 is a diagram showing the configuration of a truck according to a first embodiment of the present disclosure. FIG. 3 is a diagram showing the configuration of a connecting portion and a vertical position holding mechanism according to a first embodiment of the present disclosure. FIG. 3 is a diagram showing the configuration of a connecting portion and a vertical position holding mechanism according to a first embodiment of the present disclosure. FIG. 7 is a diagram showing the configuration of a connecting portion and a vertical position holding mechanism according to a second embodiment of the present disclosure. FIG. 7 is a diagram showing the configuration of a connecting portion and a vertical position holding mechanism according to a third embodiment of the present disclosure. FIG. 7 is a view of the vertical position holding mechanism according to the third embodiment of the present disclosure, viewed from below.

<First embodiment>
Hereinafter, a truck 10 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 3.

(vehicle)
As shown in FIG. 1, a vehicle 1 in which a bogie 10 of this embodiment is used is, for example, a railway vehicle. The vehicle 1 includes a vehicle body 2 and a truck 10. A space is provided inside the vehicle body 2 for passengers to get on and off the vehicle.

Hereinafter, the vertical up-down direction may be simply referred to as the "up-down direction", and the traveling direction of the vehicle 1 may be simply referred to as the "front-rear direction".

(trolley)
The truck 10 supports the vehicle body 2 from below and runs on a rail L along the ground. The rail L extends in one direction. A pair of rails L are provided facing each other in a direction orthogonal to the longitudinal direction of the rails L. The truck 10 includes a truck frame 20, an axle 11, a holding mechanism 12, wheels 13, a shaft spring 14, a motor 15, a power transmission joint 16, a motor bracket 19, a connection part 30, and a vertical position holding mechanism. A mechanism 40 is provided.

(Dolly frame)
The truck frame 20 is provided at a position spaced upward from the rail L. The truck frame 20 supports the vehicle body 2 from below. That is, the truck frame 20 supports the weight of the occupant from below. The truck frame 20 is a frame body extending in the horizontal direction.

(axle)
The axle 11 is located below the truck frame 20. The axle 11 is formed into a cylindrical shape extending in the horizontal direction.
Hereinafter, the axis O of the axle 11 may be simply referred to as the "axis O", and the radial direction of the axis O may simply be referred to as the "radial direction". The direction of the axis O is perpendicular to the longitudinal direction of the rail L. That is, the axis O direction is perpendicular to the front-rear direction.

(holding mechanism)
The holding mechanism 12 is a member that holds the axle 11. A pair of holding mechanisms 12 are provided on both sides of the motor 15 in the direction of the axis O. Each holding mechanism 12 is provided between the motor 15 and the wheel 13 in the direction of the axis O. The holding mechanism 12 includes a bearing box 12a and a bearing 12b. The bearing box 12a is provided so as to sandwich the axle 11 from above and below. The bearing 12b is provided between the axle 11 and the bearing box 12a. The bearing 12b supports the axle 11 rotatably around the axis O.

(Wheel)
One wheel 13 is provided at each end of the axle 11 in the axis O direction. The wheel 13 is formed into a disc shape. The thickness direction of the wheel 13 coincides with the axis O direction. The wheel 13 is connected to the end of the axle 11 at the center. The wheel 13 is fixed to the axle 11 and rotates together with the axle 11. The wheels 13 rotate on the rails L.

(axis spring)
The shaft spring 14 is provided between the truck frame 20 and the holding mechanism 12. The shaft spring 14 vertically connects the truck frame 20 and the bearing box 12a. The shaft spring 14 is a coil spring that extends in the vertical direction and absorbs vibrations in the vertical direction. The shaft spring 14 supports the truck frame 20 from below. Therefore, when the weight changes as a passenger gets on and off the vehicle, the truck frame 20 moves up and down.

(motor)
The motor 15 is provided below the truck frame 20 at an intermediate position between the pair of wheels 13 in the direction of the axis O. The motor 15 is provided to be movable relative to the truck frame 20 in the vertical direction. The motor 15 rotates the axle 11 around the axis O. The motor 15 is a direct drive type motor 15. The motor 15 includes a stator 15a, a rotor 15b, and a drive shaft 15c. The stator 15a is formed into a cylindrical shape with a central axis along the axis O of the axle 11. The rotor 15b is provided radially inside the stator 15a. The rotor 15b is formed in a cylindrical shape with its center axis along the axis O of the axle 11, similarly to the stator 15a. The rotor 15b is inserted through the stator 15a and rotates around the axis O. Like the stator 15a, the drive shaft 15c is a hollow shaft formed in a cylindrical shape with its center axis along the axis O of the axle 11. The drive shaft 15c is inserted through the rotor 15b and fixed to the inner peripheral surface of the rotor 15b. The drive shaft 15c is rotatably provided around the axis O together with the rotor 15b. A power transmission joint 16 is provided at one end of the drive shaft 15c in the direction of the axis O.

(power transmission joint)
The power transmission joint 16 is provided between the motor 15 and the holding mechanism 12 in the direction of the axis O. The power transmission joint 16 coaxially connects the axle 11 and the drive shaft 15c of the motor 15, and transmits the power of the motor 15 to the axle 11. The power transmission joint 16 includes a motor-side joint member 16a, an axle-side joint member 16b, and a coupling 16c. The motor-side joint member 16a is formed in the shape of a flange that projects from the outer peripheral surface of the drive shaft 15c in the radial direction. The motor side joint member 16a is fixed to the drive shaft 15c and rotates around the axis O together with the drive shaft 15c. The axle-side joint member 16b is fixed to the outer peripheral surface of the axle 11. The axle-side joint member 16b has a cylindrical portion 17 and a flange portion 18. The axle 11 is press-fitted into the cylindrical portion 17 . The flange portion 18 projects from the outer peripheral surface of the cylindrical portion 17 in the radial direction. The flange portion 18 is formed integrally with the cylinder portion 17. The coupling 16c is provided between the motor-side joint member 16a and the axle-side joint member 16b. The coupling 16c connects the motor-side joint member 16a and the axle-side joint member 16b. The coupling 16c is formed to be elastically deformable. The power transmission joint 16 absorbs the relative displacement of the motor 15 with respect to the axle 11 by deforming the coupling 16c.

(motor bracket)
As shown in FIGS. 2 and 3, the motor bracket 19 is provided integrally with the motor 15. As shown in FIGS. The motor bracket 19 is provided on the outer surface 15d of the motor 15. Two motor brackets 19 are provided in the front and rear directions with the axis O in between. The two motor brackets 19 provided on the same side with the axis O in between are provided symmetrically in the direction of the axis O with the center of the stator 15a in the direction of the axis O as a reference. Further, the two motor brackets 19 located on the front side with the axis O in between are provided at positions symmetrical in the front-rear direction with the two motor brackets 19 located on the rear side with the axis O in between. The motor bracket 19 protrudes from the outer surface 15d and extends in the horizontal direction.

(Connection part)
The connecting portion 30 connects the truck frame 20 and the motor bracket 19 in the vertical direction. The connecting portion 30 changes the vertical position of the motor bracket 19. A connecting portion 30 is provided for each motor bracket 19. The connecting portion 30 is provided at an end on the center side of the stator 15 a in the direction of the axis O of each motor bracket 19 . In this embodiment, the connecting portion 30 is an elastic member 30a that can be elastically deformed in the vertical direction. The connecting portion 30 is, for example, a coil spring that expands and contracts in the vertical direction.

(Vertical position holding mechanism)
The vertical position holding mechanism 40 holds the vertical position of the motor 15 by regulating the operation of the connecting portion 30 that changes the vertical position of the motor bracket 19 . In this embodiment, the vertical position holding mechanism 40 includes a hydraulic cylinder 41, a circuit 42, and a hydraulic solenoid valve 43.
In addition, in FIG. 3, the connecting portion 30 and the vertical position holding mechanism 40 on the opposite side of the power transmission joint 16 in the direction of the axis O are illustrated.

(hydraulic cylinder)
Hydraulic cylinder 41 connects truck frame 20 and motor bracket 19 in the vertical direction. A hydraulic cylinder 41 is provided for each motor bracket 19. The hydraulic cylinder 41 is provided at the end of each motor bracket 19 on the opposite side from the center side of the stator 15a in the direction of the axis O. The hydraulic cylinder 41 has a tube 44, a piston 45, and a rod 46. The tube 44 is formed into a cylindrical shape extending in the vertical direction. The tube 44 is filled with oil. Piston 45 is provided within tube 44 . The piston 45 is formed into a disk shape. The center axis of the piston 45 coincides with the center axis of the tube 44. The piston 45 can be moved vertically within the tube 44 by hydraulic pressure within the tube 44 . The rod 46 is formed into a columnar shape extending upward from the upper surface of the piston 45. The rod 46 connects the upper surface of the piston 45 and the truck frame 20. The hydraulic cylinder 41 can be expanded and contracted in the vertical direction by the hydraulic pressure within the tube 44 .

(circuit)
Oil from the hydraulic cylinder 41 flows through the circuit 42 . The circuit 42 is used to supply oil to the tube 44 and to drain oil from within the tube 44, thereby adjusting the amount of oil within the tube 44.

(Hydraulic solenoid valve)
The hydraulic solenoid valve 43 controls opening and closing of a circuit 42 through which oil of the hydraulic cylinder 41 flows. The hydraulic solenoid valve 43 receives a stop signal for the bogie 10 from an external inverter or the like, and controls opening and closing of the circuit 42 depending on the presence or absence of the bogie stop signal. When the bogie is stopped, the hydraulic solenoid valve 43 opens the circuit 42, and when the bogie is running, the hydraulic solenoid valve 43 closes the circuit 42.

(effect)
Hereinafter, the operation of the trolley 10 of this embodiment will be explained with reference to FIGS. 2 and 3.
For example, when the weight of the truck 10 increases due to an occupant getting on the vehicle, a downward load is applied to the truck frame 20, causing the truck frame 20 to descend. On the other hand, an upward reaction force acts on the motor 15 from the ground via the axle 11. The elastic member 30a contracts in the vertical direction, and the upward load and downward reaction force are absorbed. Thereby, the height of the motor 15 is maintained.

On the other hand, when the weight of the truck 10 decreases, for example, due to an occupant getting off the vehicle, the downward load applied to the truck frame 20 decreases, causing the truck frame 20 to rise. The elastic member 30a is pulled upward and extends in the vertical direction. As a result, upward displacement of the truck frame 20 is absorbed, and the height of the motor 15 is maintained.

Further, the elastic member 30a's expansion/contraction length is defined by the hydraulic cylinder 41. When the truck is stopped, the hydraulic solenoid valve 43 receives a stop signal for the truck 10 from an inverter or the like, opens the oil circuit 42 of the hydraulic cylinder 41, and the hydraulic cylinder 41 becomes expandable and retractable. Thereby, when the bogie is stopped, the elastic member 30a can expand and contract in the vertical direction, and the connecting portion 30 can adjust the vertical position of the motor 15 with respect to the bogie frame 20. Further, when the bogie is traveling, the hydraulic solenoid valve 43 closes the oil circuit 42, and the amount of oil in the hydraulic cylinder 41 becomes constant. As a result, when the bogie is traveling, vertical expansion and contraction of the elastic member 30a is suppressed, and the vertical position of the motor 15 with respect to the bogie frame 20 is fixed.

Hereinafter, the advantages of the trolley 10 of this embodiment will be explained.
In this embodiment, the truck 10 includes a motor bracket 19, a connecting portion 30, and a vertical position holding mechanism 40. The motor bracket 19 is provided on the outer surface 15d of the motor 15, protrudes from the outer surface 15d, and extends in the horizontal direction. The connecting portion 30 connects the truck frame 20 and the motor bracket 19 in the vertical direction, and changes the vertical position of the motor bracket 19 with respect to the truck frame 20. The vertical position holding mechanism 40 defines the operation of the connecting portion 30 that changes the vertical position of the motor bracket 19.

According to the present embodiment, when the weight of the truck 10 increases due to an occupant getting on the vehicle, a downward load is applied to the truck frame 20, and the truck frame 20 descends. In contrast, the connecting portion 30 raises the motor 15 relative to the truck frame 20. Thereby, the height of the motor 15 is maintained. Further, when the trolley 10 starts traveling, the vertical position holding mechanism 40 regulates the operation of the connecting portion 30. Thereby, the height of the motor 15 is maintained even while the trolley 10 is running. Conversely, when the weight of the truck 10 decreases due to the occupant getting off the vehicle, the downward load applied to the truck frame 20 decreases, causing the truck frame 20 to rise. In this case, the connecting portion 30 operates to lower the motor bracket 19 relative to the truck frame 20. As a result, upward displacement of the truck frame 20 is absorbed, and the height of the motor 15 is maintained. Therefore, even if the truck 10 moves up and down due to passengers getting on and off, the truck 10 of this embodiment adjusts the relative position of the motor 15 with respect to the truck frame 20 to absorb the relative displacement of the motor 15 with respect to the axle 11. be able to. Therefore, the amount of displacement to be absorbed by the power transmission joint 16 is reduced, and the degree of freedom in designing the power transmission joint 16 is increased. Furthermore, since the stress amplitude of the power transmission joint 16 is reduced, the life of the power transmission joint 16 can be extended.

Further, a direct drive system is adopted for the motor 15, and the motor 15 and the axle 11 are directly connected via a power transmission joint 16. Therefore, the weight and volume of the truck 10 are reduced compared to a case where the motor 15 and the axle 11 are connected via, for example, a gear box. Furthermore, the motor 15 is suspended from the trolley frame 20 via the connection part 30. As a result, at least a portion of the weight of the motor 15 is borne by the truck frame 20, so the weight of the wheels 13 and the axle 11 is reduced. Therefore, it is possible to reduce rail damage.

In this embodiment, the connecting portion 30 is an elastic member 30a that can be elastically deformed in the vertical direction.

According to this embodiment, when the weight of the trolley 10 increases due to an occupant getting on the vehicle, a downward load is applied to the trolley frame 20, and the trolley frame 20 descends. On the other hand, an upward reaction force acts on the motor 15 from the ground via the axle 11. The elastic member 30a contracts in the vertical direction, and the upward load and downward reaction force are absorbed. Thereby, the height of the motor 15 is maintained. Conversely, when the weight of the truck 10 decreases due to the occupant getting off the vehicle, the downward load applied to the truck frame 20 decreases, causing the truck frame 20 to rise. The elastic member 30a is pulled upward and extends in the vertical direction. As a result, upward displacement of the truck frame 20 is absorbed, and the height of the motor 15 is maintained. Therefore, even if the truck 10 moves up and down due to passengers getting on and off, the truck 10 of this embodiment adjusts the relative position of the motor 15 with respect to the truck frame 20 to absorb the relative displacement of the motor 15 with respect to the axle 11. be able to.

In this embodiment, the vertical position holding mechanism 40 includes a hydraulic cylinder 41, a circuit 42, and a hydraulic solenoid valve 43. The hydraulic cylinder 41 connects the truck frame 20 and the motor bracket 19 in the vertical direction, and is expandable and contractible in the vertical direction. Oil from the hydraulic cylinder 41 flows through the circuit 42 . Hydraulic solenoid valve 43 controls opening and closing of circuit 42 .

According to this embodiment, when the bogie is stopped, the hydraulic solenoid valve 43 opens the oil circuit 42, and the hydraulic cylinder 41 becomes expandable and retractable. Thereby, when the bogie is stopped, the elastic member 30a can expand and contract in the vertical direction, and the connecting portion 30 can adjust the vertical position of the motor 15 with respect to the bogie frame 20. Further, when the bogie is traveling, the hydraulic solenoid valve 43 closes the oil circuit 42, and the expansion and contraction of the hydraulic cylinder 41 is suppressed. As a result, when the bogie is traveling, vertical expansion and contraction of the elastic member 30a is suppressed, and the vertical position of the motor 15 with respect to the bogie frame 20 is fixed. As described above, according to the present embodiment, the vertical expansion and contraction of the elastic member 30a is regulated by the expansion and contraction of the hydraulic cylinder 41, and the vertical position of the motor 15 with respect to the truck frame 20 is adjusted when the truck is stopped, while when the truck is running. By fixing the vertical position of the motor 15 with respect to the truck frame 20, vibrations generated as the truck 10 travels can be suppressed and damped.

<Second embodiment>
Hereinafter, a truck 210 according to a second embodiment of the present disclosure will be described with reference to FIG. 4. Configurations similar to those of the first embodiment described above will be given the same names and numerals, and descriptions thereof will be omitted as appropriate.

As shown in FIG. 4, the vertical position holding mechanism 240 includes a ratchet mechanism 241 and an electromagnetic actuator 242. The ratchet mechanism 241 includes a first ratchet member 243 and a second ratchet member 244.

The first ratchet member 243 extends upward from the motor bracket 19. Note that the first ratchet member 243 may extend downward from the motor bracket 19. In this embodiment, the first ratchet member 243 is provided on the motor bracket 19 located at the rear with respect to the motor 15. The first ratchet member 243 is formed into a plate shape extending in the vertical direction. A first engagement groove 243a is formed in the first ratchet member 243 on the side surface facing away from the motor 15.

The second ratchet member 244 is provided so as to be engageable with the first ratchet member 243. The second ratchet member 244 fixes vertical displacement of the first ratchet member 243 by engaging with the first ratchet member 243. In this embodiment, the second ratchet member 244 is formed into a plate shape extending in the vertical direction. The second ratchet member 244 is disposed on the opposite side of the motor 15 with the first ratchet member 243 in between so as to face the first ratchet member 243 .

A second engagement groove 244a is formed in the second ratchet member 244 on the side surface facing the first ratchet member 243. The second engagement groove 244a is formed to be able to engage with the first engagement groove 243a. The second ratchet member 244 has an engagement position P1 where the first ratchet member 243 and the second ratchet member 244 engage, and an engagement position P1 where the engagement between the first ratchet member 243 and the second ratchet member 244 is released. It is provided so as to be movable to the release position P2.

The electromagnetic actuator 242 moves the second ratchet member 244 between the engagement position P1 and the disengagement position P2. The electromagnetic actuator 242 receives a stop signal for the truck 210 from an external inverter or the like, and moves the second ratchet member 244 depending on the presence or absence of the stop signal for the truck 210. When the truck is running, the electromagnetic actuator 242 moves the second ratchet member 244 to the engagement position P1, and when the truck is stopped, the electromagnetic actuator 242 moves the second ratchet member 244 to the disengagement position P2.

In this embodiment, the vertical position holding mechanism 240 includes a first ratchet member 243, a second ratchet member 244, and an electromagnetic actuator 242. The first ratchet member 243 extends vertically from the motor bracket 19. The second ratchet member 244 is provided so as to be able to engage with the first ratchet member 243, and fixes vertical displacement of the first ratchet member 243 by engaging with the first ratchet member 243. The electromagnetic actuator 242 has an engagement position P1 where the first ratchet member 243 and the second ratchet member 244 engage, and an engagement release position where the first ratchet member 243 and the second ratchet member 244 are disengaged. The second ratchet member 244 is moved to P2.

According to this embodiment, when the trolley is traveling, the connecting portion 30 engages the first ratchet member 243 and the second ratchet member 244 by the electromagnetic actuator 242 to suppress upward displacement of the first ratchet member 243. Can be done. Thereby, expansion and contraction of the elastic member 30a is suppressed when the bogie runs. Further, when the bogie is stopped, the connecting portion 30 uses the electromagnetic actuator 242 to disengage the first ratchet member 243 and the second ratchet member 244, allowing the first ratchet member 243 to be displaced in the vertical direction. Thereby, when the bogie is stopped, the elastic member 30a can expand and contract in the vertical direction, and the connecting portion 30 can adjust the vertical position of the motor 15 with respect to the bogie frame 20. As described above, according to the present embodiment, the vertical expansion and contraction of the elastic member 30a is regulated by the engagement between the first ratchet member 243 and the second ratchet member 244, and the vertical expansion and contraction of the motor 15 with respect to the trolley frame 20 is controlled when the trolley is stopped. While adjusting the directional position, the vertical position of the motor 15 with respect to the truck frame 20 is fixed when the truck is running, thereby suppressing and attenuating vibrations that occur as the truck 210 runs.

<Third embodiment>
Hereinafter, a truck 310 according to a third embodiment of the present disclosure will be described with reference to FIGS. 5 and 6. Configurations similar to those of the first embodiment described above will be given the same names and numerals, and descriptions thereof will be omitted as appropriate.

As shown in FIGS. 5 and 6, the connecting portion 30 includes a ball screw 331 and a bearing 332. The ball screw 331 has a screw shaft 333 and a power source (not shown). The screw shaft 333 passes through the truck frame 20 in the vertical direction. The screw shaft 333 is provided so as to be rotatable around the screw axis O1 of the screw shaft 333 and displaceable in the vertical direction. The lower end of the screw shaft 333 is connected to the motor bracket 19. The power source rotates the screw shaft 333 around the screw axis O1 and displaces the screw shaft 333 in the vertical direction.

The bearing 332 is provided on the truck frame 20. The bearing 332 rotatably holds the screw shaft 333 around the screw axis O1. The bearing 332 has an inner ring 334 and an outer ring 335. A threaded shaft 333 is inserted into the inner ring 334 . The inner ring 334 is rotatably provided around the screw axis O1 together with the screw shaft 333. The outer ring 335 is fixed to the truck frame 20. The outer ring 335 holds the inner ring 334 rotatably around the screw axis O1 so that the inner ring 334 is inserted and the lower end of the inner ring 334 is exposed. A stopper 335a is formed on the outer peripheral surface of the outer ring 335. The stopper 335a protrudes outward from the outer peripheral surface of the outer ring 335 and engages with the truck frame 20. The stopper 335a prevents the ball screw 331 and the bearing 332 from dropping downward from the truck frame 20.

The vertical position holding mechanism 340 includes a position holding mechanism main body 341 and an electromagnetic actuator 342. The position holding mechanism main body 341 is arranged so as to surround the lower end of the inner ring 334 from the outer peripheral side. In this embodiment, the position holding mechanism main body 341 has a semicircular arc portion 341a and a straight portion 341b. The semicircular arc portion 341a is formed in a semicircular arc shape surrounding the screw shaft 333 and the inner ring 334 from the outer peripheral side when viewed from the top and bottom. The straight portion 341b extends linearly from the end of the semicircular arc portion 341a in a direction away from the screw shaft 333 when viewed from the top and bottom. The straight portion 341b is formed integrally with the semicircular arc portion 341a. The straight portion 341b is connected to the semicircular arc portion 341a and the electromagnetic actuator 342.

The position holding mechanism main body 341 is movable between a contact position P3 where it contacts the inner ring 334 and suppresses rotation of the inner ring 334, and a non-contact position P4 where it is spaced apart from the inner ring 334.
The electromagnetic actuator 342 moves the position holding mechanism main body 341 to a contact position P3 and a non-contact position P4. The electromagnetic actuator 342 receives a stop signal for the truck 310 from an external inverter or the like, and moves the position holding mechanism main body 341 depending on the presence or absence of the stop signal for the truck 310. When the trolley is running, the electromagnetic actuator 342 moves the position holding mechanism main body 341 to the contact position P3, and when the trolley is stopped, the electromagnetic actuator 342 moves the position holding mechanism main body 341 to the non-contact position P4.

In the present embodiment, the connecting portion 30 includes a ball screw 331 having a threaded shaft 333 that vertically passes through the truck frame 20. The screw shaft 333 is provided so as to be rotatable around the screw axis O1 of the screw shaft 333 and displaceable in the vertical direction. The lower end of the screw shaft 333 is connected to the motor bracket 19.

According to this embodiment, when the bogie is stopped, the ball screw 331 rotates the screw shaft 333 to adjust the vertical position of the motor 15 with respect to the bogie frame 20. As a result, upward displacement of the truck frame 20 is absorbed, and the height of the motor 15 is maintained.

In this embodiment, the connecting portion 30 has a bearing 332. The bearing 332 is provided on the truck frame 20 and holds the screw shaft 333 rotatably around the screw axis O1. The bearing 332 has an inner ring 334 and an outer ring 335. A screw shaft 333 is inserted into the inner ring 334 . The inner ring 334 is rotatable around the screw axis O1 together with the screw shaft 333. The outer ring 335 is fixed to the truck frame 20. An inner ring 334 is inserted into the outer ring 335. The outer ring 335 rotatably holds the inner ring 334 around the screw axis O1 so that the lower end of the inner ring 334 is exposed. The vertical position holding mechanism 340 includes a position holding mechanism main body 341 that is movable between a contact position P3 and a non-contact position P4, and an electromagnetic mechanism that moves the position holding mechanism main body 341 between the contact position P3 and the non-contact position P4. It has an actuator 342.

According to this embodiment, when the trolley is traveling, the vertical position holding mechanism 340 brings the position holding mechanism main body 341 into contact with the inner ring 334 of the bearing 332, thereby suppressing the rotation of the screw shaft 333. This makes it possible to suppress displacement of the motor 15 in the vertical direction with respect to the truck frame 20 when the truck is traveling. Therefore, when the truck 310 is traveling, the vertical position holding mechanism 340 fixes the vertical position of the motor 15 with respect to the truck frame 20, thereby suppressing and attenuating vibrations that occur as the truck 310 travels.

(Other embodiments)
Although the embodiment of the present disclosure has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes within the scope of the gist of the present disclosure. .

In the above embodiment, examples of the vertical

position holding mechanisms

40, 240, and 340 include a case where the vertical position holding mechanism 40 has a hydraulic cylinder 41 and a hydraulic solenoid valve 43, and a case where the vertical position holding mechanism 240 has a ratchet mechanism 241. Although the case where the vertical position holding mechanism 340 has the position holding mechanism main body 341 that suppresses the rotation of the ball screw 331 has been described, the present invention is not limited to this. For example, the vertical

position holding mechanisms

40, 240, 340 may use a jack mechanism driven by an actuator from the outside, a linear guide, or the like.

In addition, although the said embodiment demonstrated the case where the trolley|bogie 10,210,310 is a railway vehicle trolley, it is not restricted to this. The

trolleys

10, 210, and 310 may be used, for example, as forklifts or electrically assisted trolleys that are manually pushed by people when transporting heavy objects.

<Additional notes>
The

carts

10, 210, and 310 described in each embodiment are understood as follows, for example.

(1) The

carts

10, 210, 310 according to the first aspect include a cart frame 20, an axle 11 located below the cart frame 20 and extending in the horizontal direction, and an axle 11 extending in the vertical direction with respect to the cart frame 20. A motor 15 that is provided to be relatively displaceable and rotates the axle 11 around an axis O of the axle 11, a power transmission joint 16 that coaxially connects the axle 11 and a drive shaft 15c of the motor 15, and the motor A motor bracket 19 is provided on an outer surface 15d of the truck frame 15, protrudes from the outer surface 15d, and extends horizontally, and connects the truck frame 20 and the motor bracket 19 in the vertical direction.

Connection parts

30, 330 that change the vertical position of the bracket 19; Vertical

position holding mechanisms

40, 240, 340 that define the operation of the

connection parts

30, 330 that change the vertical position of the motor bracket 19; , is provided.

According to this aspect, when the weight of the

truck

10, 210, 310 increases, a downward load is applied to the truck frame 20, and the truck frame 20 descends. In contrast, the connecting

portions

30 and 330 raise the motor 15 relative to the truck frame 20. Thereby, the height of the motor 15 is maintained. Further, when the

carts

10, 210, 310 start traveling, the vertical

position holding mechanisms

40, 240, 340 regulate the operation of the connecting

parts

30, 330. Thereby, the height of the motor 15 is maintained even while the

trolleys

10, 210, 310 are running.

(2) The

truck

10, 210 of the second aspect may be the

truck

10, 210 of (1), and the connecting portion 30 may be an elastic member 30a that can be elastically deformed in the vertical direction.

According to this aspect, when the weight of the

truck

10, 210 increases, a downward load is applied to the truck frame 20, and the truck frame 20 descends. On the other hand, an upward reaction force acts on the motor 15 from the ground via the axle 11. The elastic member 30a contracts in the vertical direction, and the upward load and downward reaction force are absorbed. Thereby, the height of the motor 15 is maintained.

(3) The truck 10 of the third aspect is the truck 10 of (2), in which the vertical position holding mechanism 40 connects the truck frame 20 and the motor bracket 19 in the vertical direction, and It may have an extendable hydraulic cylinder 41, a circuit 42 through which the oil of the hydraulic cylinder 41 flows, and a hydraulic solenoid valve 43 that controls opening and closing of the circuit 42.

According to this aspect, when the bogie is stopped, the hydraulic solenoid valve 43 opens the oil circuit 42, and the hydraulic cylinder 41 becomes expandable and retractable. Thereby, when the bogie is stopped, the elastic member 30a can expand and contract in the vertical direction, and the connecting portion 30 can adjust the vertical position of the motor 15 with respect to the bogie frame 20. Further, when the bogie is running, the hydraulic solenoid valve 43 closes the oil circuit 42, and the expansion and contraction of the hydraulic cylinder 41 is suppressed. As a result, when the bogie is traveling, vertical expansion and contraction of the elastic member 30a is suppressed, and the vertical position of the motor 15 with respect to the bogie frame 20 is fixed.

(4) The truck 210 of the fourth aspect is the truck 210 of (2), in which the vertical position holding mechanism 240 includes a first ratchet member 243 extending in the vertical direction from the motor bracket 19, and a first ratchet member 243 extending in the vertical direction from the motor bracket 19. a second ratchet member 244 that is provided to be engageable with the member 243 and fixes vertical displacement of the first ratchet member 243 by engagement with the first ratchet member 243; The second ratchet member 244 is at an engagement position P1 where the second ratchet member 244 is engaged and an engagement release position P2 where the engagement between the first ratchet member 243 and the second ratchet member 244 is released. An electromagnetic actuator 242 that moves the .

According to this aspect, when the bogie is traveling, the connecting portion 30 engages the first ratchet member 243 and the second ratchet member 244 by the electromagnetic actuator 242, thereby suppressing the upward displacement of the first ratchet member 243. can. Thereby, expansion and contraction of the elastic member 30a is suppressed when the bogie runs. Further, when the bogie is stopped, the connecting portion 30 uses the electromagnetic actuator 242 to disengage the first ratchet member 243 and the second ratchet member 244, allowing the first ratchet member 243 to be displaced in the vertical direction. Thereby, when the bogie is stopped, the elastic member 30a can expand and contract in the vertical direction, and the connecting portion 30 can adjust the vertical position of the motor 15 with respect to the bogie frame 20.

(5) The truck 310 of the fifth aspect is the truck 310 of (1), in which the connecting portion 330 includes a ball screw 331 having a threaded shaft 333 that vertically passes through the truck frame 20, The screw shaft 333 may be provided to be able to rotate around the screw axis O1 of the screw shaft 333 and be displaced in the vertical direction, and a lower end portion of the screw shaft 333 may be connected to the motor bracket 19.

According to this aspect, when the bogie is stopped, the ball screw 331 rotates the screw shaft 333 to adjust the vertical position of the motor 15 with respect to the bogie frame 20.

(6) The truck 310 of the sixth aspect is the truck 310 of (5), in which the connecting portion 330 is provided on the truck frame 20 and is capable of rotating the screw shaft 333 around the screw axis O1. The bearing 332 has an inner ring 334 into which the screw shaft 333 is inserted and is rotatable together with the screw shaft 333 around the screw axis O1, and is fixed to the truck frame 20. The vertical position holding mechanism 40 includes an outer ring 335 into which the inner ring 334 is inserted and which holds the inner ring 334 rotatably around the screw axis O1 so that the lower end of the inner ring 334 is exposed. between a contact position P3, which is arranged so as to surround the lower end of the inner ring 334 from the outer peripheral side, and which contacts the inner ring 334 to suppress rotation of the inner ring 334, and a non-contact position P4, which is spaced apart from the inner ring 334; It may include a movable position holding mechanism main body 341 and an electromagnetic actuator 342 that moves the position holding mechanism main body 341 to the contact position P3 and the non-contact position P4.

According to this aspect, when the trolley is running, the vertical position holding mechanism 40 brings the position holding mechanism main body 341 into contact with the inner ring 334 of the bearing 332, thereby suppressing the rotation of the screw shaft 333. This makes it possible to suppress displacement of the motor 15 in the vertical direction with respect to the truck frame 20 when the truck is traveling.

1... Vehicle 2... Vehicle body 10... Truck 11... Axle 12... Holding mechanism 12a... Bearing box 12b... Bearing 13... Wheel 14... Shaft spring 15... Motor 15a... Stator 15b... Rotor 15c... Drive shaft 15d... Outer surface 16... Power transmission Joint 16a...Motor side joint member 16b...Axle side joint member 16c...Coupling 17...Cylinder part 18...Flange part 19...Motor bracket 20...Dolly frame 30...Connection part 30a...Elastic member 40...Vertical position holding mechanism 41...Hydraulic pressure Cylinder 42...Circuit 43...Hydraulic solenoid valve 44...Tube 45...Piston 46...Rod 210...Dolly 240...Vertical position holding mechanism 241...Ratchet mechanism 242...Electromagnetic actuator 243...First ratchet member 243a...First engagement groove 244... Second ratchet member 244a...Second engagement groove 310...Dolly 330...Connection part 331...Ball screw 332...Bearing 333...Screw shaft 334...Inner ring 335...Outer ring 335a...Stopper 340...Vertical position holding mechanism 341...Position holding mechanism body 341a... Semicircular arc part 341b... Straight line part 342... Electromagnetic actuator L... Rail O... Axis line O1... Screw axis line P1... Engagement position P2... Disengagement position P3... Contact position P4... Non-contact position

Claims

trolley frame,
an axle located below the truck frame and extending in the horizontal direction;
a motor that is provided to be movable relative to the truck frame in the vertical direction and rotates the axle about the axis of the axle;
a power transmission joint that coaxially connects the axle and the drive shaft of the motor;
a motor bracket provided on the outer surface of the motor, protruding from the outer surface and extending in the horizontal direction;
a connection part that vertically connects the truck frame and the motor bracket and changes the vertical position of the motor bracket with respect to the truck frame;
a vertical position holding mechanism that defines an operation of the connecting portion that changes the vertical position of the motor bracket;
A trolley equipped with.
The trolley according to claim 1, wherein the connecting portion is an elastic member that can be elastically deformed in the vertical direction.
The vertical position holding mechanism is
a hydraulic cylinder that vertically connects the truck frame and the motor bracket and is expandable and retractable in the vertical direction;
a circuit through which the oil of the hydraulic cylinder flows;
a hydraulic solenoid valve that controls opening and closing of the circuit;
has,
The trolley according to claim 2.
The vertical position holding mechanism is
a first ratchet member extending vertically from the motor bracket;
a second ratchet member that is provided to be engageable with the first ratchet member and that fixes vertical displacement of the first ratchet member by engagement with the first ratchet member;
The second ratchet is located at an engagement position where the first ratchet member and the second ratchet member engage, and at an engagement release position where the first ratchet member and the second ratchet member are disengaged. an electromagnetic actuator that moves the member;
The trolley according to claim 2, comprising:
The connection part has a ball screw having a screw shaft that vertically passes through the truck frame,
The screw shaft is provided so as to be able to rotate around the screw axis of the screw shaft and displace in the vertical direction,
a lower end of the screw shaft is connected to the motor bracket;
The trolley according to claim 1.
The connecting portion includes a bearing that is provided on the truck frame and rotatably holds the screw shaft around the screw axis,
The bearing is
an inner ring into which the screw shaft is inserted and is rotatable around the screw axis together with the screw shaft;
an outer ring that is fixed to the truck frame, into which the inner ring is inserted, and holds the inner ring rotatably around the screw axis so that the lower end of the inner ring is exposed;
has
The vertical position holding mechanism is
a position holding mechanism that is arranged to surround the lower end of the inner ring from the outer circumferential side and is movable between a contact position that contacts the inner ring to suppress rotation of the inner ring and a non-contact position that is spaced apart from the inner ring; The main body and
an electromagnetic actuator that moves the position holding mechanism main body between the contact position and the non-contact position;
The trolley according to claim 5, comprising: