JPH0254264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swing device, and particularly relates to a swing device having a characteristic that swing rigidity is large within a range where the swing angle is small and swing rigidity is small in a range exceeding a certain set angle. .

When a railway vehicle passes through a curved track, the bogie frame of the bogie turns relative to the car body around the pivot axis, and when it turns, a rigid force acts against the turning in order to stabilize the car body. ing.

In conventional vehicles, the rigidity force that resists turning is provided by a spring force such as a coil spring, and the spring characteristics have first-order linear characteristics as shown by the broken line in FIG. There is a tendency that the larger the turning displacement, the larger the turning rigidity. In addition, some conventional devices provide turning rigidity using combination springs, and as shown by the solid line in Figure 1, the spring characteristics of these devices are that the turning rigidity is small when turning at a minute angle, and when turning from the reference position. It has a characteristic that when the angle increases beyond a certain set angle, the turning rigidity increases.

By the way, recently, unlike normal railway vehicles,
New transportation systems in which vehicles run in concrete trenches are being planned.

Figure 2 shows an example of such a new transportation system, in which a bogie 3 runs in a concrete groove 1 with running tires 2, and the bogie 3 runs laterally within the groove 1. Guidance is performed by rolling a guide wheel 5 provided at the tip of an arm 4 projecting left and right from the side of the truck along a side wall 6 of the groove 1.

In this type of vehicle, when the vehicle travels on a straight road, the turning rigidity is increased within a range where the turning angle from the reference position of the bogie is small to increase stability when traveling; When passing through a running route, it is desirable to reduce the turning rigidity of the bogie in order to facilitate maneuvering to quickly follow changes in the curve.

Such turning characteristics are required not only for the above-mentioned vehicles but also for automobile steering mechanisms and other turning mechanisms.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a swing device with a simple structure and reliable operation, which has a characteristic that the swing rigidity is high within a small range of swing angle from a reference position, and the swing rigidity is small in a range exceeding a set angle. It is about providing.

In order to achieve the above object, the present invention combines a rotating frame and a fixed frame so as to be able to rotate relative to each other around the center of rotation, a torque transmission arm is provided protruding from one side of the rotating frame, and this Resistance applying devices are installed on both sides of the torque transmission arm, and each resistance applying device has a main cylinder chamber that is closed on one side by a diaphragm, and the center of the diaphragm has a main cylinder chamber that protrudes toward the torque transmission arm. a presser is fixed, and a first sub-cylinder chamber and a second sub-cylinder chamber are connected in parallel to the main cylinder chamber,
A diaphragm pressed by a first spring with a large spring constant is stretched in the first sub-cylinder chamber, while a diaphragm with a small spring constant and loaded with an initial load is placed in the second sub-cylinder chamber. A diaphragm that is pressed by two springs is stretched in the first sub-cylinder chamber, and the movement of the diaphragm is restrained at a predetermined stroke corresponding to a minute turning angle from the reference position of the turning frame, and the first spring is released. This device is characterized by incorporating a stopper that turns the device into an activated state.

An embodiment of the swing device according to the present invention will be described below with reference to FIG.

FIG. 3 shows an example in which the turning device according to the present invention is applied between the vehicle body frame 10 and the bogie frame 11. A bogie frame 11 as a turning frame is incorporated into a vehicle body frame 10 as a fixed frame, and the bogie frame 11 is centered around the turning center O.
It is designed to be able to rotate around the center. An axle is mounted on this bogie frame 11 as in FIG. 2, and running wheels are provided at the ends of the axle (not shown). Further, the bogie frame 11 has a turning ring 12.
is fixed, and the center of this turning ring 12 coincides with the turning center O. It is preferable that the vehicle body frame 10 and the bogie frame 11 are combined at this turning ring 12 so as to be able to turn.

A torque transmitting arm 14 is protruded from one side of the truck frame 11, and resistance applying devices, generally indicated by reference numeral 15, are installed on both sides of the torque transmitting arm 14. This resistance imparting device 15
As shown in FIG. 4, the main cylinder 16 has a main cylinder chamber 17 on the inside, and a diaphragm 18 on one side.
It is closed by. Further, a pusher 19 is fixed to the outside of the diaphragm 18, and this pusher 19 extends toward the side surface of the torque transmission arm 14.

Further, the main cylinder chamber 17 has a first port 2.
1 and a second port 22 are formed, and the main cylinder chamber 1
7 is filled with hydraulic oil.

Thus, a first sub-cylinder 24 is connected to the first port 21 of the main cylinder via a pipe 23, and a second sub-cylinder 26 is connected to the second port 22 of the main cylinder via a pipe 25. has been done. Among these, the first sub-cylinder 24 has a first
A sub-cylinder chamber 27 is formed, and this cylinder chamber 2
A diaphragm 28 is stretched inside the cylinder chamber 7 and divides the inside of the cylinder chamber 27 into an outer chamber 27a and an inner chamber 27b. A coil spring 29 with a large spring constant is installed in the outer chamber 27a, and a stopper 30 is installed at the center of the coil spring 29.
The diaphragm 28 is pressed toward the outer chamber 27a by the pressure of the hydraulic oil, and the diaphragm 28 comes into contact with the stopper 30 when it is displaced by δ.

On the other hand, a second sub-cylinder chamber 31 is formed inside the second sub-cylinder 26, and a diaphragm 32 is stretched inside the cylinder chamber 31, and the inside of the cylinder chamber 31 is divided into an outer chamber 31a and an inner chamber 31b. It is divided into Among these, a coil spring 33 with a small spring constant is installed in the outer chamber 31a. A predetermined initial load is applied to the coil spring 33, so that the movement of the diaphragm 32 is restricted by the stopper 34.

Since the present invention is configured in this way, when the truck frame 11 rotates, for example, clockwise around the rotation center O, the torque transmission arm 14 pushes the pusher 19 in the direction of the arrow in FIG. 4. Then, the hydraulic oil flows out from the first port 21 and flows through the pipe 23 into the inner chamber 27b of the first sub-cylinder chamber 27.
The diaphragm 28 is moved toward the outer chamber 27a. In this initial state, since the initial load P ₀ is applied to the coil spring 33, the diaphragm 32 is kept stationary, and only the coil spring 29, which has a large spring constant, contracts by δ, and the load-displacement characteristic during this period is It is shown as in Figure 5A.

In this way, when the diaphragm 28 of the first sub-cylinder 24 moves by δ, the diaphragm 28 comes into contact with the stopper 30, and further displacement is restricted. Therefore, after this contact, the spring force of the coil spring 29 does not work, and since the magnitude of the load at this point is made to match the initial load of the coil spring 33, the spring force in the second sub-cylinder 26 is now Only the diaphragm 32 is displaced against the spring force of the coil spring 33, and the load-displacement characteristic is shown as shown in FIG. 5B, and the rate of increase in load with respect to displacement is small. The turning rigidity acting on 11 becomes smaller.

As a result, the relationship between the swing angle and the swing rigidity in the swing device according to the present invention is a combination of the characteristics of both, as shown in FIG _. Within the range of , the spring force of the first spring 29 with a large spring constant generates a large turning stiffness, while in the range exceeding the set angle θ ₀ , the spring force of the second spring with a small spring constant produces a small turning stiffness. It will occur.

Note that the configuration of the resistance applying device installed on the left side of the torque transmission arm 14 is exactly the same as that installed on the right side, so a description thereof will be omitted.

As is clear from the above description, according to the present invention, when the swing frame rotates about the center of rotation, the spring force of the first spring having a large spring constant is large in the range of a small set angle from the reference position. On the other hand, the spring force of the first spring is restricted after the set turning angle is exceeded, and only the spring force of the second spring, which has a small spring constant, becomes a small turning rigidity and turns. can be applied to the frame to obtain desired properties.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the characteristics of turning displacement and turning rigidity of a conventional turning device, FIG. 2 is a plan view showing an example of a cart suitable for applying the present invention, and FIG.
The figure is a plan view showing an embodiment of the turning device according to the present invention, FIG. 4 is an explanatory diagram showing details of the configuration of the resistance applying device, and FIGS. FIG. 3 is a diagram showing stiffness characteristics. DESCRIPTION OF SYMBOLS 10... Vehicle body frame (fixed frame), 11... Bogie frame (swivel frame), O... Turning center, 15... Resistance imparting device, 17... Main cylinder chamber, 18... Diaphragm, 19... Presser , 27...first sub-cylinder chamber, 28...diaphragm, 29...first spring,
31...Second sub-cylinder chamber, 32...Diaphragm, 33...Second spring.

Claims (1)

[Scope of Claims] 1. A rotating frame and a fixed frame are combined so as to be able to rotate relative to each other around the center of rotation, and a torque transmission arm is provided protruding from one side of the rotation frame, and both sides of the torque transmission arm are provided. Each resistance applying device has a main cylinder chamber whose one side is closed by a diaphragm, and a presser protruding toward the torque transmission arm is fixed to the center of the diaphragm. Further, a first sub cylinder chamber and a second sub cylinder chamber are connected in parallel to the main cylinder chamber, and a diaphragm pressed by a first spring having a large spring constant is tensioned in the first sub cylinder chamber. On the other hand, the second sub-cylinder chamber has a small spring constant and is loaded with an initial load.
A diaphragm pressed by a spring is stretched in the first sub-cylinder chamber, and the movement of the diaphragm is restrained at a predetermined stroke corresponding to a minute turning angle from the reference position of the turning frame, and the first spring is inactivated. A turning device characterized by incorporating a stopper for setting the position. 2. The swing device according to claim 1, wherein the first and second springs are coil springs.