JPS5811649B2 - Lever device with variable lever ratio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lever device of a type that outputs a reciprocating motion in response to an input of a reciprocating motion. This invention relates to a lever device that can obtain the desired results.

Conventionally, a lever device for this purpose is an adjustment link device used in steam locomotives, but this known device has a fulcrum at a fixed position and changes the output by moving the output point. The phase is variable.

However, moving the output point in this way inevitably complicates the mechanism associated with the lever device.

On the other hand, if it is possible to move around a structure in which the northward phase of the lever is variable without moving the input/output point or fulcrum, the configuration of the reciprocating part becomes simple, and the structure of the component parts becomes simple. This simplifies the overall configuration of a device that employs this lever device, improves reliability, and is advantageous in terms of manufacturing and maintenance.

Also, in applications where the mass of the reciprocating parts has an effect on performance, the low mass of the reciprocating parts is advantageous.

The present invention has been made with attention to the above points, and by rotating the switching shaft, which is part of the mechanism, by a required angle without moving the input/output point or the fulcrum, the lever ratio can be changed and the phase can be reversed. This provides a mechanism that allows for a wide range of changes, including:

The configuration and operation of the present invention will be explained with reference to the drawings.

In Fig. 1, 1 is the operating lever, and A is the input point □.
It has an input arm 1a having a point B, an output arm 1b having a point B as an output point, and a boss part 7, which is fitted with a pin 2a projecting at right angles from the lever shaft 2, and therefore the lever shaft 2 and the boss portion 7 are relatively rotatably connected to each other about an axis in the y-y direction passing through point P.

Further, the lever shaft 2 is supported by a fork 8 so as to be rotatable around the XI-XI axis at both ends thereof.
A conversion shaft 3 is integrally formed in the.

An arm 4 is fixed to the conversion shaft 3, and an air cylinder 5 for conversion is connected to the arm 4.

When input 1 acts on this lever device and human displacement δA1 is applied, the operating lever and lever shaft become one body, Xl-
It rotates by an angle α around the Xl axis, causing an output point displacement of δB1, and an output O is obtained.

The situation is shown in Figure 2.

Figure 2 is a view from the direction of Xl-Xl, where the radius of rotation at the input point is rAI, the radius of rotation at the output point is rBl, and the axis (y-y) of the pin 2a is y/- due to the input displacement δA1. y
The output displacement δ is at an angle α with respect to the initial position as shown by /.
B1 is rB]sin α.

FIG. 3 shows the mechanism of the present invention in which the switching axis assumes a second angle.

That is, the conversion air cylinder 5 is retracted and the conversion shaft 3
The axis of maintains an angle of x2-X2.

When input 1 acts on this lever device and input displacement δA2 is applied, the operating lever and lever shaft become one body, X2
It rotates around the X2 axis, causing an output point displacement of δB27) and obtaining an output of 0.

The situation is shown in Figure 4. Figure 4 is a view seen from the direction of X2, where the radius of rotation at the input point is rA2, the radius of rotation at the output point is rB2, the input displacement δ, and the center of the pin 2a.
The actuating lever is tilted by an angle .beta. with respect to the initial position, as shown by the axis y-y of y'//-y//.

δB2 is rB2 sin β.

Therefore, it can be seen that the lever ratio direction is the opposite direction and the lever function in this state is in the opposite phase.

FIG. 5 is a diagram of the mechanism of the present invention viewed in the y-y direction, showing the relationship between the rotation angle of the conversion shaft, the lever ratio, and the phase.

A is the input point, B is the output point, and the axis of conversion axis 3 is XI
1, the radius of rotation at the input point is rAl, the radius of rotation at the output point is rBl, and the lever ratios are on the same side, so
The input and output phases are the same.

When the axis of the conversion shaft 3 is at X2 X2, the rotation radius of the input point is rA2 and the rotation radius of the output point is rB2, and the input and output are in opposite phases because they are on the opposite side of the lever.

As is clear from this figure, the same phase can be achieved by selecting rl.

In the above explanation, the conversion shaft 3 is moved by the air cylinder 5, and the conversion shaft 3 can only take positions corresponding to the extended position and the retracted position of the air cylinder 5.

In this mechanism, by setting the dimensions in advance, it is possible to convert between two different predetermined lever ratios.

In FIG. 6, the rotation of the conversion shaft 3 is performed by the rotation of an electric motor, and the rotation of the electric motor 9 is caused by the reduction gear 10, the worm 11,
It is transmitted to the conversion shaft 3 via the worm wheel 12.

In this case, due to the locking action between the worm 11 and the worm wheel 12, the angle rl of the conversion shaft 3 shown in FIG.
, r2 can be taken to any value, and any lever ratio can be obtained for both normal phase and anti-phase.

Also, in a structure similar to that shown in Fig. 1, the air cylinder 5
If we replace it with a hydraulic cylinder and create a lap state with the control valve, the angle of the conversion shaft 3 shown in Fig. 5 r ], , r 2
can be taken to any value and any lever ratio can be obtained.

FIG. 7 shows an embodiment in which the lever device of the present invention is used in the steering system of a rubber tire type guided track vehicle. Four guide wheels 15 are arranged,
The guide wheel 15 at one end of the vehicle steers the running wheel 14 at the end of the vehicle, and the guide wheel 15 at the other end of the vehicle steers the running wheel 14 at the end of the vehicle.

In this method, if there is a guide wheel in front of the running wheel 14, steering is performed in the same direction as the displacement of the guide wheel, and if there is a guide wheel behind the running wheel, steering is performed in the opposite direction to the displacement of the guide wheel. It is necessary to do so.

If the vehicle only travels in one direction, a link mechanism that exhibits such an effect may be used, but if the vehicle is to be driven forward or backward, it is necessary to change the operating direction of the steering system to the opposite direction.

For this reason, the mechanism of the present invention is used in the lever device shown at 16 in FIG. 7, and the lever device is switched in synchronization with the control for switching forward/reverse driving power of the vehicle.

Reference numeral 17 denotes a beam connecting the left and right guide wheels.The lateral displacement of this beam 17 is inputted to the lever device 16 via the link 18, and the output of the lever device 16 is inputted to the axle shaft 21 via the link 19 and the knuckle arm 20. The axle 21 is steered, and the main shaft of the opposite wheel is also steered via the tie rod 22.

Reference numeral 23 denotes a guide rail which has the effect of guiding the vehicle along with the guide wheels.

As shown in Figure 8.9.10, the link 18 connects the input arm 1a of the operating lever 1 of the lever device according to the invention to the input point A.
The output point B of the output arm 1b is connected to the link 19.

The conversion shaft 3 integrally formed with the fork portion 8 is connected to an electric motor 28 via a planetary gear device 26 and a worm mechanism 27, and the conversion shaft 3 is rotated by the electric motor 28.

As explained above, the lever device of the present invention allows the input/output displacement ratio and phase to be adjusted arbitrarily without moving the positions of the input/output points, and other The mechanism can be greatly simplified.

[Brief Description of the Drawings] Fig. 1 is a perspective view showing an example of the lever device of the present invention, Fig. 2 is a perspective view showing an example of the lever device of the present invention;
The figure is an end view showing the input/output displacement relationship of the lever device shown in Fig. 1, Fig. 3 is a perspective view showing the lever device shown in Fig. 1 in another position, and Fig. 4 is the position shown in Fig. 3. FIG. 5 is an explanatory diagram showing the principle of displacement ratio adjustment in the lever device of the present invention, and FIG. 6 is an end view similar to FIG. FIG. 7 is a bottom view of a guide rail vehicle employing the lever device of the present invention, FIG. 8 is a plan view showing the steering control mechanism of the vehicle of FIG. 7, and FIG. 9 is a perspective view similar to FIG. is its side view, 1st
Figure 0 is an enlarged view of the lever device of the present invention employed therein. 1... Acting lever, 1a... Input arm, 1b... Output arm, 2... Lever shaft, 3... Conversion shaft.

Claims (1)

[Scope of Claims] 1. An operating lever having a human power section and an output section, and a lever that is rotatable around a rotation axis in substantially the same direction as the input/output direction at a point that is not on a straight line connecting the input and output points of the operating lever. a lever shaft coupled to the operating lever so as to
The lever shaft is supported in a bendable manner in a direction substantially perpendicular to the rotation axis between the lever shaft and the operating lever, and a lever device with a variable lever ratio is provided with a switching shaft for selectively moving the bending axis. . 2. The lever device according to item 1, wherein movement of the breakage-resistant axis is performed by rotation of a conversion shaft. 3. The lever device according to item 1, wherein the lever shaft is rotatably supported by a fork member at both ends, and the fork member is integrated with or connected to the conversion shaft.