JPH0254262B2 - - Google Patents

Description

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

When a railway vehicle passes through a curved track, the underframe of the bogie turns relative to the car body around the pivot axis, and when it turns, a rigid force acts against the turning to stabilize the car body. It's summery.

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 a first-order linear characteristic as shown by the broken line in Figure 1. There is a tendency for the turning rigidity to increase as the turning displacement increases. 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, in recent years, 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 curves.

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 large within a range where the swing angle from a reference position is small, and the swing rigidity is small in a range exceeding a set angle. It is about providing.

In order to achieve the above object, a turning device according to the present invention combines a turning frame and a fixed frame so as to be able to rotate relative to each other around a turning center, and includes a notch on the turning frame at approximately the center of a cam surface. While fixing the cam plate, one end of the first torque transmission arm is pivotally supported on the fixed frame side, and the free end of the torque transmission arm is inserted into the notch of the cam plate while the rotating frame rotates by a minute set angle from the reference position. A large resistance imparting device is disposed on both sides of the first torque transmitting arm, and a second torque transmitting arm is protruded from the rotating frame, and a small resistance applying device is disposed on both sides of the second torque transmitting arm. The device is characterized in that a resistance applying device is arranged to apply a large turning rigidity to the turning frame within a small set angle from a reference position, and to apply a small turning resistance within a range exceeding this set angle. be.

Embodiments of the swing device according to the present invention will be described below with reference to FIGS. 3 to 9.

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 12 is mounted on this bogie frame 11.
Running tires 14, 14 are attached to both ends of the wheel. Further, a turning wheel 15 is fixed to the bogie frame 11, and the center of the turning wheel 15 coincides with the turning center O. At the turning wheel 15, the vehicle body frame 10 and the bogie frame 11 are combined so as to be able to turn.

Further, a cam plate 16 is fixed to one side of the bogie frame 11, and this cam plate 16 has a cam surface 17 that is a part of a circular arc with the center of curvature at the turning center O. A small arc-shaped notch 18 is formed. This notch 18 is located on the axle 1 when traveling straight.
It is on the center line that is perpendicular to the axis of No. 2 and passes through the center of rotation O. This notch 18 has a pivot 1 on the side of the vehicle body frame 10.
A roller 20a at the free end of the first torque transmitting arm 20, which is pivotally connected via 9, is engaged. Further, large resistance applying devices 21 are arranged symmetrically on both sides of the torque transmitting arm 20, respectively. Each large resistance imparting device 21 includes a spring receiving box 22 fixed to the side of the vehicle body frame 10, a coil spring 23 with a large spring constant housed in the box, and a pressing element 24 that receives the spring force of the spring 23 on its back surface. It is composed of.

On the other hand, on the opposite side of the bogie frame 11, a second torque transmission arm 25 is provided protrudingly. Small resistance applying devices 26 are arranged symmetrically on both sides of the torque transmitting arm 25 in the middle. Each small resistance applying device 26 is connected to a spring receiving box 2 fixed to the side of the vehicle body frame 10.
7, a coil spring 28 with a small spring constant housed in this box, and a presser 29 that receives the spring force of this spring 28 on its back surface.

Since the present invention is configured in this way, when the bogie frame 11 turns around the turning center O, the large spring force of the coil spring 23 generates a large turning rigidity within a range where the turning angle from the reference position is small. let On the other hand, when a certain set angle is exceeded, the bogie frame 11 is released from the influence of the coil spring 23, and a small spring force by the coil spring 28 acts on the bogie frame 11 as a small turning rigidity.

That is, in FIG. 4, it is assumed that the truck frame 11 rotates clockwise in the figure by a minute angle θ about the rotation center O. During this time, the engagement state between the notch 18 of the cam plate 16 and the roller 20a at the free end of the torque transmission arm 20 is maintained, and the torque transmission arm 20 rotates counterclockwise around the pivot shaft 19. During this time, the coil spring 23
is subjected to resistance or stiffness due to a large spring force. Then, as shown in FIG. 5b, the bogie frame 1
1, that is, when the cam plate 16 has rotated by a certain set angle θ ₀ , the roller 2 at the free end of the torque transmission arm 20
0a is disengaged from the notch 18 of the cam plate, and the spring force of the coil spring 23 no longer exerts any influence on the bogie frame 11. After the set angle θ ₀ is exceeded, a small spring force by the coil spring 28 acts on the second torque transmission arm 25, so a small turning stiffness is generated on the bogie frame 11. It turns out. Then, as shown in FIG. 5c, the free end 20a of the torque transmitting arm 20 reaches the terminal end of the cam surface 17 when the truck frame 11 rotates by the maximum turning angle θ _nax .

The relationship between the turning angle displacement and turning rigidity in the device configured in this way is as shown in Fig. 6, and within the setting range where the turning angle from the reference position is small, the turning rigidity is large, and the turning rigidity is large within the setting range where the turning angle from the reference position is _small . Outside this range, a characteristic of low turning rigidity is obtained.

Next, another embodiment of the swing device according to the present invention will be described in the seventh embodiment.
This will be explained with reference to FIGS. 9 to 9.

In the embodiment shown in FIG. 7, instead of using two types of coil springs with different spring constants, the turning rigidity is changed by combining one type of spring and a lever arm. This is an example.

That is, the torque transmission arm 30 is formed into a lever shape. The torque transmitting arm 30 is supported at its middle by a fulcrum 31 on the side of the vehicle body frame 10, and the roller 32 at one end engages with the notch 18 of the cam plate 16, while the opposite end and the vehicle body frame 10 are connected to each other. Restore spring 33
is installed.

According to this embodiment, when the bogie frame 11 rotates by a small set angle θ ₀ about the rotation center O, the roller 32 is held in the notch 18 of the cam plate 16, The spring force of the restoring spring 33 is large. However, as shown in Figure 8,
When the set angle θ ₀ is exceeded, the roller 32 of the torque transmission arm 30 slips out of the notch 18 of the cam plate 16 and rides on the cam surface 17. Then, torque transmission arm 3
0 tilts clockwise in the figure around the fulcrum 31, stretches the restoring spring 33, and changes the spring constant to a smaller value. As a result, the turning rigidity becomes small in a region exceeding the turning setting angle θ ₀ .

FIG. 9 shows still another embodiment of the present invention, in which the cam surface 17 of the cam 16 is arranged such that the cam radius R(θ) gradually increases according to the rotation angle θ from the reference position. It is configured. Therefore,
The restoring spring 33 has a cam radius R(θ) of the cam surface 17.
As a result, the torque transmission arm 30 moves and generates a restoring force. The radius R(θ) of the cam changes depending on the rotation angle θ, but the rate of change is 0≦
The desired broken line characteristic can be obtained by setting the increase rate to m ₁ in the range of θ≦θ ₀ and by setting the increase rate to m ₂ in the range of θ ₀ ≦θ.

As is clear from the above description, according to the present invention, a cam plate whose rotation center coincides with the rotating frame is provided, a torque transmission arm is engaged with a notch in the cam surface of the cam plate, and the torque transmission arm is A spring is applied to the other end, and the spring force of this spring is changed depending on the amount of rotation of the cam plate, so it is possible to increase the turning rigidity within a range where the turning angle is small, and at the same time when the turning angle exceeds the set angle. It is possible to provide characteristics that reduce turning rigidity. Furthermore, by changing the cam curve of the cam surface, the rigidity characteristics associated with turning can also be changed.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the turning displacement-turning rigidity characteristics 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. 3 is a diagram showing the turning rigidity characteristics of a conventional turning device. FIG. 4 is a plan view showing an embodiment of the turning device. FIG. 4 is a plan view showing the bogie frame turned by a small angle. FIGS. 5 a, b, and c show the movement of the cam plate and the movement of the torque transmission arm. An explanatory diagram showing the state of
Fig. 6 is a diagram showing the turning displacement-turning rigidity characteristics according to the present invention, Fig. 7 is a plan view showing a turning device according to another embodiment of the invention, and Fig. 8 shows that the bogie frame has only a small turning angle. FIG. 9 is a plan view showing another modification of the cam plate. 10... Vehicle body frame, 11... Bogie frame, O... Turning center, 16... Cam plate, 17... Cam surface, 18...
...notch, 20...torque transmission arm.

Claims (1)

[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 cam plate having a notch at approximately the center of the cam surface is fixed and fixed on the rotating frame. One end of the first torque transmitting arm is pivotally supported on the frame side, and while the rotating frame rotates by a minute set angle from the reference position, the free end of the torque transmitting arm is locked in the notch of the cam plate. A large resistance imparting device is disposed on both sides of the torque transmitting arm, while a second torque transmitting arm is protruded from the rotating frame, a small resistance imparting device is disposed on both sides of this second torque transmitting arm, and a reference A swing device characterized in that a large swing rigidity is applied to a swing frame within a minute set angle from a position, and a small swing rigidity is applied within a range beyond this set angle. 2 The above-mentioned large resistance imparting device comprises a spring receiver fixed to the fixed frame side, a coil spring with a large spring constant housed in the spring receiver, and a first torque transmitting arm attached to the tip of the coil spring. 2. The turning device according to claim 1, further comprising a pusher protruding toward the rotating device. 3 The above-mentioned small resistance imparting device consists of a spring receiving box fixed to the fixed frame side, a coil spring with a small spring constant housed in the spring receiving box, and a second torque transmitting arm attached to the tip of the coil spring. 2. The turning device according to claim 1, further comprising a pusher protruding toward the rotating device.