JPH0254263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a turning device having turning resistance, and particularly to a turning device suitable for use in a bogie of a vehicle.

A bogie frame of a bogie of a railway vehicle pivots relative to the car body on a curved track to enable the vehicle to pass through the curved track. When the vehicle turns, an elastic force is applied to resist the turning.

In conventional vehicles, the elastic force for turning is provided by spring force such as a coil spring.
The spring characteristic has a first-order linear characteristic as shown by the broken line in FIG. 1, and the turning rigidity tends to increase as the turning displacement increases. In addition, some conventional devices provide turning rigidity using combination springs, and their spring characteristics, as shown by the solid line in Figure 1, have low resistance to turning during minute turning displacements, that is, low turning stiffness. , it has a bend line characteristic in which the turning rigidity increases as the turning displacement increases beyond a certain value. In conventional railway vehicles,
A bogie using a combination spring with such a bending characteristic stabilizes the running of the vehicle and allows it to pass smoothly on curved tracks.

By the way, in recent years, new transportation systems that are different from ordinary railway vehicles have been planned, and some of them are already in operation. As shown in Fig. 2, it is equipped with a bogie frame 3 that runs in a concrete groove 1 by running wheels 2 having rubber tires, and guides for running the bogie in the groove 1 are provided on the sides of the bogie frame protruding left and right. Place the guide wheel 5 at the tip of the arm 4 into the groove 1.
The use of a vehicle by rolling along the side wall 1a of the vehicle is being considered.

In this type of vehicle, in order to prevent lateral vibration due to unnecessary rotation of the bogie on straight roads and ensure stable running of the vehicle, the turning rigidity of the bogie is increased in the range of minute turning displacement of the bogie, and on curved roads, the turning rigidity of the bogie is increased. In order to make this easier, it is necessary to lower the turning rigidity of the bogie over a large turning displacement range.

Furthermore, the above-mentioned turning resistance characteristics may be required not only for such vehicles but also for turning mechanisms for other purposes.

Therefore, the present invention has the above-mentioned turning resistance characteristics,
Moreover, the object is to obtain a swing device with a simple structure and reliable operation.

The turning device of the present invention has a first portion and a second portion that rotate relative to each other around a turning center,
The first part is formed with a working arm in a radial direction with respect to its pivot center, and on at least one side of the working arm,
An actuated arm is provided that is rotatable about a pivot attached to the second part, and the tip of the actuated arm is used as an actuated part that receives the action of the side edge of the actuated arm. A swing resistance spring is associated which acts in the direction of pressing the acted part of the tip against the side edge of the working arm, and the acted arm and the working arm are connected to each other when the first part is in its reference position for turning. The acted part of the arm abuts the outer side edge of the acting arm in the radial direction,
As the first part pivots from its reference position toward said one side of the working arm, the acted arm is rotated about its pivot axis against the force of the pivot resistance spring and the acted part is rotated toward said one side of the working arm. It is positioned so that the position where it abuts against the side edge of is gradually moved inward in the radial direction.

Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 3, reference numeral 2 denotes running wheels of the bogie frame 3 of the vehicle, and as in the case of FIG. 2, guide wheels can be provided on both sides of the bogie frame 3 via arms. A vehicle body 7 is supported on the bogie frame 3 via a rotating support base 6. The truck side constitutes a first part, and the vehicle body side constitutes a second part, and these parts are relatively rotatable around a turning center O.

An operating arm 8 is provided to protrude from the truck frame 3 in the radial direction of the turning center O. While the vehicle is running on a straight road, this working arm 8 is in a reference (neutral) position indicated by a solid line, and in this standard position, the working arm 8 faces in the direction in which the vehicle is traveling.

On both sides of the working arm 8, pivot shafts 9, 9 are attached to the vehicle body 7 forming the second part, and the base end of the acted arm 10 is pivotally attached to each pivot shaft 9, and the acted part 11 is attached to the tip of the pivot shaft 9. It is provided. The actuated portion 11 consists of, for example, a roller.

Each pivot 9 is provided with a swivel resistance spring 13, which swivel resistance spring 13 consists, for example, of a torsion spring. Other types of springs or torsion shafts can also be used as the pivot resistance spring 13. The rotation resistance spring 13 acts on the actuated arm 10 and brings its actuated portion 11 into contact with the side edge of the actuation arm 8 . The pivot 9 is connected to the working arm 8 in the reference position.
It is located on the outside in the radial direction of the position where the actuated portion 11 abuts.

Therefore, when the truck side turns relative to the car body 7, for example, counterclockwise in the figure, the actuated arm 1 is rotated through the actuated portion 11 by the counterclockwise rotation of the acting arm 8.
0 is rotated clockwise. When the working arm 8 is rotated by an angle α to the position indicated by the chain line in the figure, the operated arm 10 is rotated to the position indicated by the chain line, and the operated part 11 is moved radially inward along the side edge of the active arm 8. Displaced. Of course, the rotation of the acting arm 8 and the acted arm 10 at this time is done against the force of the turning resistance spring 13, and therefore, the turning resistance spring 13 provides resistance to the turning of the bogie relative to the vehicle body 7.

Next, let's consider this change in resistance value.
As shown in FIG. 4, in order to rotate the affected arm 10 clockwise about the pivot 9, a tangential force F is required to overcome the elasticity of the rotation resistance spring 13. increases as shown by Fa, Fb, and Fc almost in proportion to the increase in the rotation angle of the affected arm 10. In order to apply such a tangential force F to the affected arm 10, the acting arm 8 must apply a force f perpendicular to its longitudinal direction (radial direction) to the affected part 11. The force f is
As is clear from the comparison between force fa, which has force Fa as a tangential component, and force fb, which has force Fb as a tangential component, it is extremely large in the initial angular range of rotation of the affected arm 10, and as the rotation angle increases. Decrease rapidly. However, the force f shows a tendency to gradually increase as the rotation angle further increases.

From these facts, it can be seen that a large resistance acts on the operating arm 8 in the initial angular range in which the operating arm 8 rotates counterclockwise from the reference position shown by the solid line in FIG. Moreover, in the vicinity of this reference position, the distance from the pivot center O of the point where the acted part 11 contacts the acting arm 8, that is, the moment arm
R ₁ is the largest and therefore a very large moment must be overcome in order for the bogie to turn relative to the car body 7 from its reference (neutral) position.

On the other hand, when the truck turns to a position where the action arm 8 corresponds to the forces Fb and fb in Fig. 4, the moment arm becomes shorter toward the minimum length R ₂ (Fig. 3), and the action arm 8 becomes shorter as described above. Since the force fb that should be applied to the acted part 11 is reduced, the rate of increase in the turning resistance of the bogie is further reduced.

The above-mentioned effect can be similarly obtained when the truck turns clockwise in FIG. 3. Therefore, the relationship between turning resistance and turning displacement of the bogie is as shown in Fig. 5. In the initial minute turning range, the rate of increase in turning resistance is large and the turning rigidity of the cart is large.
As the turning angle increases to a certain extent, the turning rigidity decreases, resulting in a relationship in which the bogie's adaptability to curved roads becomes better.

It is clear that the principles described above can be applied not only to the pivoting of the truck and the vehicle body, but also to any two parts pivoting relative to each other.

As described above, according to the present invention, the initial turning rigidity is large with a simple structure using one type of spring.
When the turning angle increases to a certain extent, a turning device is obtained in which the rate of increase in turning rigidity decreases. The principle of this turning device can be applied not only to a device that turns in two directions as in the embodiment, but also to a device that turns only in one direction.

[Brief explanation of drawings]

Fig. 1 is a graph showing the turning resistance characteristics of a bogie of a conventional vehicle, Fig. 2 is a plan view showing an example of a bogie suitable for applying the turning device of the present invention, and Fig. 3 is a graph showing the turning resistance characteristic of a bogie of a conventional vehicle. The plan view, FIG. 4 is a mechanical explanatory diagram of the swing device of the present invention, and FIG. 5 is a graph showing the swing resistance characteristics of the swing device of the present invention. O... Turning resistance, 2... Running wheels, 3... Bogie frame (first part), 7... Car body (second part),
8... Acting arm, 9... Axis, 10... Affected arm,
11...Actioned part, 13...Turning resistance spring, _R1 ,
R ₂ ... Moment arm.

Claims (1)

[Scope of Claims] 1. It has a first part and a second part that rotate relative to each other around the center of rotation, the first part has a working arm formed in the radial direction with respect to the center of rotation, and the working arm At least one side of the actuated arm is provided with an actuated arm that is rotatable about a pivot attached to the second part, and the tip of the actuated arm is used as an actuated part that is acted upon by the side edge of the actuated arm; The actuated arm is associated with a swing resistance spring that acts in a direction that presses the actuated portion at the distal end of the actuated arm against the side edge of the actuating arm; When in the reference position, the actuated portion of the actuated arm abuts the radially outer side edge of the actuating arm, and as the first portion pivots from its reference position toward the one side of the actuating arm, The actuated arm is rotated about its pivot axis against the force of a rotation resistance spring, and the actuated portion is positioned so that the position where it contacts the side edge of the actuating arm gradually moves inward in the radial direction. Swivel device with swing resistance. 2. The pivot according to claim 1, wherein the axis of the acted arm is provided radially outward with respect to the turning center from the position where the acted part abuts the side edge of the acting arm at the reference position of the acting arm. Device. 3. The turning device according to claim 1 or 2, wherein the turning resistance spring is a torsion spring provided around the pivot of the actuated arm.