JPH0415318A - Flexible joint - Google Patents

Abstract

PURPOSE:To get over a resonance point without growing the lateral vibration to the maximum amplitude vibration at a resonance point providing a main shaft claw and a driven shaft claw in such a manner as to be increased in claw width from the claw root portion to the claw forward end portion in an elastic body compression type flexible joint. CONSTITUTION:A main shaft claw has a structure such that the width W of the claw is increased to be tapered from the main shaft claw root portion 13a to the main shaft claw forward end portion 13b, and a driven shaft claw 14 is increased in width to be tapered in the projecting direction. The torque of a main shaft 11 is transmitted in the form of pressure from the side of the main shaft claw 13 to the side of the driven shaft claw 14 with the compressive deformation of an elastic body 17. The pressure of the elastic body 17 works on the main shaft claw 13 and the side of the driven shaft claw 14 as the vertical force F to be decomposed into the force Fa parallel to the axial direction of the joint and the force Fr intersecting perpendicularly thereto. Fr contributes to power transmission, and Fa is increased in proportion to the torque to act so that the main shaft 11 and the driven shaft 14 always pull each other. Only during the acceleration and deceleration of a vehicle when the torque is applied to a propeller shaft, the lateral resonance point, that is, the critical speed can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a flexible joint, and particularly to an elastic compression type flexible joint.

(Prior Art) An elastic body compression type flexible joint uses an elastic body as a torque transmitting element, and is connected and configured to enable power transmission to allow movement between members to be connected.

Figures 4 and 5 show the configuration of this type of flexible joint, and Figure 6 is a perspective view showing a specific structural example when the basic configuration is that of Figures 4 and 5. be.

In the figure, ■ indicates the main shaft, and 2 indicates the slave shaft connected to the main shaft l. In FIG. 6, the main shaft side connecting member 1a is
, corresponding to the slave shaft side connecting member 2a), an appropriate number of master shaft claws 3 and slave shaft claws 4 (three each in the figure) are formed protruding from each opposing surface of the main shaft l and the slave shaft 2. The main shaft pawl 3 and the slave shaft pawl 4 are combined with each other so that they are arranged between the pawl portion on one side or the pawl portion on the other side, and the gap between the side surfaces of the adjacent pawls is filled with torque due to compressive force. They are assembled with an elastic body 5 interposed therebetween, which transmits the information, thereby forming an elastic body compression type flexible joint.

When torque is applied from the main shaft 1, in the above flexible joint, the torque of the main shaft 1 is applied by the main shaft type 3 to the slave shaft pawl 4 via the elastic body 5 sandwiched between the main shaft type 3 and the slave shaft pawl 4. It is transmitted to the slave shaft 2, and power is transmitted. Further, the elastic body 5 allows bending at the joint portion and therefore mutual movement of one claw portion with respect to the other claw portion during rotational driving.

(Problem to be solved by the invention) Although such a flexible joint can be used to connect various rotating elements so that they can be bent and transmit power, it is difficult to avoid shaft lateral vibration at a given rotational speed when the shaft rotates. When used in a transmission system where the amplitude increases due to resonance, it does not have a function to suppress or reduce the amplitude.

For example, when considering the case where the above-mentioned flexible joint is assembled and used on the propeller shaft of a vehicle, as shown in Fig. 4 or Fig. 6, the main shaft type 3 and the slave shaft pawl 4 protruding from the main shaft and slave shaft sides are It has a shape that extends parallel to the shaft center line, and therefore, the compressive force through the elastic body 5 of the main shaft type 3 due to the main shaft torque is received by the subordinate shaft pawl 4 perpendicularly. If the external damping force is not increased when the propeller shaft passes through a critical speed during acceleration/deceleration rotation, the amplitude of the lateral vibration of the propeller shaft will increase. However, the flexible joint itself having the above configuration cannot be expected to have a function of suppressing lateral vibration in such cases.

The purpose of the present invention is to improve the elastic compression type flexible joint so that it can be applied to a power transmission system where the vibration amplitude in the axial transverse direction is a problem, without causing the vibration to grow to the maximum amplitude vibration at the resonance point. The objective is to provide a flexible joint that can overcome the

(Means for Solving the Problems) For this purpose, the flexible joint of the present invention has a main shaft type protrude in the axial direction from the main shaft side, and a slave shaft pawl in the axial direction from the slave shaft side to be connected to the main shaft. An elastic compression type flexible joint that protrudes and interposes an elastic body between the side surface of the main shaft claw and the side surface of the slave shaft claw, wherein the main shaft type and the slave shaft claw are moved from the base of the claw to the tip of the claw. It is shaped to be wide.

(Function) The shapes of the main shaft type and slave shaft claws, in which the claws protrude from the main shaft and slave shaft sides, are formed so that the width of the claws increases from the base of the claw plate to the tip of the claw, which prevents a flexible joint from forming when transmitting torque. This also generates an axial tensile force.

As a result, it is possible to raise the resonance point of shaft-lateral vibration during shaft rotation, and it is possible to avoid the vibration from growing to the maximum vibration amplitude at the resonance point.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 and 2 show an embodiment of the flexible joint of the present invention.

As shown in the figure, the main shaft 11 and the slave shaft 12 include a main shaft mold 13 and a slave shaft pawl 14 that protrude in the joint axis direction. The main shaft mold 13 on the main shaft side and the slave shaft pawl 14 on the slave shaft side can be formed by attaching end members 15 and 16, respectively, as shown in the illustrated example.

The main shaft type 13 and the slave shaft claw 14 are basically combined so that they are located between one claw part or the other claw part, or
The shape of the spindle mold 13 that protrudes in the axial direction from the spindle is as follows from the spindle claw base 13a to the spindle claw tip.
It has a structure in which the width W of the claw is widened in a tabular shape. On the other hand, similarly, the slave shaft pawl 14 has a tapered shape that becomes wider in the direction of protrusion. That is,
The slave shaft pawl 14 also expands into a tapered shape as it projects from the base portion 14a of the slave shaft pawl to the tip end of the slave shaft pawl.

An elastic body 17 that transmits torque by compressive force is interposed between the main shaft type 13 and the slave shaft pawl 14 configured as described above, thereby forming an elastic body compression type flexible joint.

In this embodiment, elastic bodies 18 and 19 are further interposed between the main shaft claw end 13b and the slave shaft claw base 14a, and between the subordinate shaft wind end 14b and the main shaft claw base 13a.

Furthermore, as for the elastic bodies 18 and 19 filled between the above-mentioned elements, those having non-linear spring stiffness are used. In this example, the elastic bodies 18, 19 are both selected to have a non-linear spring effect.

In the flexible joint of this embodiment, the claws protruding from the main shaft II and the slave shaft 12 have a tapered shape that becomes wider from the root to the tip. 13.14 An elastic body 17 is interposed between the side surfaces, and elastic bodies 28 and 19 having non-linear spring rigidity are interposed between the claw ends and bases of the main shaft and the slave shaft, and in particular, When applied to the power transmission system of a vehicle's propeller shaft, it makes it possible to overcome the resonance point without increasing the lateral vibration of the propeller shaft to the maximum amplitude vibration at the resonance point, and eliminates problems when the vehicle starts or suddenly accelerates. The windup phenomenon of the differential also suppresses this well.

Hereinafter, the function of the present flexible joint will be explained by taking application to such a transmission system as an example, and also referring to FIG. 3. In addition, the third
The figure is an explanatory view mainly of the effect of pressure due to compressive deformation of the elastic body 17, and is an enlarged view of a part of the joint portion in FIG. 1.

First, when focusing on the case of transmitting the torque of the main shaft 11 to the slave shaft 12, the torque of the main shaft 11 is accompanied by compressive deformation of the elastic body I7 from the side surface of the main shaft pawl 13, and forms pressure on the side surface of the slave shaft wind 14. (At this time, the side surface of the spindle pawl 13 opposite to the rotational direction is not connected to the elastic body 17, so no tensile force is applied to the elastic body 17.) Therefore, when the pressure is transmitted in the form of pressure as described above, the pressure is transmitted as a force in the direction perpendicular to the side surface of the slave shaft claw, or in this case, in this flexible joint, torque is transmitted and at the same time axial tensile force is transmitted. to generate.

That is, as shown in FIG. 3, the pressure of the elastic body 17 due to compressive deformation of the elastic body acts as a force F perpendicular to the side surfaces of the main shaft pawl 13 and the slave shaft wind 14, and the 20 force F is applied in the joint axial direction. It is decomposed into a parallel force Fa and a component FT perpendicular to this force component Pa. Of these, the latter force F contributes to power transmission, and therefore the force FT transmits the torque of the main shaft 11 to the slave shaft 12.

On the other hand, the former component Fa is an axial component, and this axial force Fa increases in proportion to the torque applied to the joint.Also, even if the direction of the applied torque is reversed, this axial force Fa is always applied to the main shaft 11. , the slave shafts 14 act to pull each other (in the direction of pulling each other).

This axial force component Fa is generated from the structure of the flexible joint itself, and the relative distance in the axial direction between the main shaft 11 and the slave shaft 12 becomes shorter due to the action of this axial force Pa. Therefore, when this flexible joint is applied to a propeller shaft, an axial tensile force proportional to the torque will act on the propeller shaft to which the flexible joint is assembled due to the above-mentioned action, and the torque will be applied to the propeller shaft of the vehicle. It is possible to increase the resonance point, that is, the critical speed, of the lateral vibration of the propeller shaft only during acceleration and deceleration, and it is possible to overcome the resonance point without allowing the vibration to grow to the maximum vibration amplitude at the resonance point.

The above-mentioned axial force Fa acts on the elastic bodies 18 and 19 interposed between the main shaft claw end 13b and the slave shaft claw base 14a, and between the slave shaft claw end 14b and the main shaft type root 13a. When this occurs, compressive deformation occurs and bending rigidity increases, or
Furthermore, the configuration in which this is an elastic body having non-linear spring stiffness adds the following functions to this flexible joint.

That is, if the elastic bodies 18 and 19 interposed between the claw ends and roots of the main shaft 11 and the slave shaft 12 are made of a material with a nonlinear spring characteristic in which the spring rigidity increases as the displacement in the compression direction increases. Since the spring stiffness of the elastic bodies 18 and 19 increases when torque is applied due to the action of the axial force Fa, the degree to which the bending stiffness is increased when the joint is bent is increased. Due to such an effect, first, as mentioned above,
Only when the electric picture is accelerated or decelerated, that is, when torque is applied to the propeller shaft, there is an effect of raising the resonance point of the lateral vibration of the propeller shaft, and this effect can be further enhanced.

It is also effective against the following windup phenomenon.

As described, in the flexible joint shown in Fig. 4, the main shaft pawl and the slave shaft wind are parallel to the shaft center line, and the slave shaft wind receives the compressive force of the elastic body of the main shaft pawl due to the main shaft torque perpendicularly. Therefore, when a flexible joint having such a structure is used to connect a propeller shaft and a differential of a vehicle, wind-up of the differential freely occurs due to bending of the bent portion of the joint when the vehicle starts, etc. In contrast, even when the flexible joint of this embodiment is assembled between the propeller shaft and the differential, the propeller shaft and the differential become semi-rigid only when torque is applied due to the bending rigidity of the joint. The effect of the mass and the force of the center bearing that fixes the propeller shaft to the vehicle body has the effect of suppressing differential windup, which only becomes a problem when torque is applied.

Note that the present invention is not limited to the configuration of the above-described embodiment, and its application is not limited to transmission systems such as propeller shafts of vehicles. For example, the present invention is not limited to transmission systems such as propeller shafts of vehicles. It can be applied to various power transmission systems.

(Effects of the Invention) Thus, in the flexible joint of the present invention, as described above, the width of the main shaft pawl and the slave shaft that protrudes from the main shaft and slave shaft sides increases in accordance with the direction of protrusion, and the side surface of the main shaft pawl and the side surface of the slave shaft pawl become wider. Since the structure has an elastic body interposed between them, it is possible to generate axial tensile force in the joint itself during torque transmission, and even in the case of a power transmission system where the vibration amplitude in the axial transverse direction is a problem, the maximum The transverse vibration does not grow to the amplitude vibration (it is possible to overcome the resonance point).

[Brief explanation of the drawing]

Figure 1 is a side view of one embodiment of the flexible joint of the present invention, and Figure 2 is A-AJjj! of Figure 1! 3 is a diagram used to explain the effect of pressure due to compressive deformation of the elastic body in the joint shown in Figure 1. Figure 4 is a side view showing a conventional elastic body compression type flexible joint. FIG. 4 is a sectional view taken along the line B-B in FIG. 4, and FIG. 6 is an exploded perspective view showing a specific example of a conventional flexible joint. II...Main shaft 13...Main shaft pawls 17, 18.19...Elastic body 12...Slave shaft 14...Slave shaft wind Figure 6

Claims (1)

[Claims] 1. The main shaft pawl projects in the axial direction from the main shaft side, and the slave shaft pawl projects in the axial direction from the slave shaft side to be connected to the main shaft, and the side surface of the main shaft pawl and the slave shaft pawl An elastic compression type flexible joint in which an elastic body is interposed between the side surfaces, characterized in that the main shaft pawl and the slave shaft pawl are each formed such that the pawl width increases from the nail base to the nail tip. Flexible joint. 2. According to claim 1, an elastic body is further interposed between at least one or both of the tip of the main shaft claw and the base of the slave claw, and between the tip of the subordinate shaft and the base of the main shaft claw. Flexible joint as described. 3. A flexible joint, wherein the elastic body according to claim 2 is an elastic body having nonlinear spring stiffness.