JP2637416B2 - Coupling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coupling device that controls torque transmission between relatively rotatable members.

[Prior Art] Generally, as this type of coupling device, for example,
Japanese Unexamined Utility Model Publication No. 60-99333 is known, and its main configuration is to engage a resistance plate alternately inserted in a working chamber filled with a viscous fluid on an input shaft and an output shaft side, respectively. Then, the rotational force of the input shaft is transmitted to the output shaft via the viscous fluid.

[Problems to be Solved by the Invention] However, in such a conventional coupling device, the housing that partitions the working chamber is formed by forging steel.
Machining, and machining of spline grooves to engage with the resistance plate,
It was manufactured through processing steps such as welding integration.

For this reason, complicated processes are required and the shape is large,
In addition, there is a disadvantage that the weight is heavy and the cost is high, and particularly when it is adopted for a small car, it is accompanied by difficulties.

Therefore, the present invention has been made in view of the above problems, and has as its object to provide a coupling device which is easy to manufacture, lightweight and small, and can be easily adopted even in a small car or the like.

[Means for Solving the Problem] The present invention has the following configuration to solve the above problem.

That is, the coupling device according to the present invention includes an input shaft that receives a rotation input, an output shaft that takes out a rotational force, and an output shaft that is alternately arranged in the axial direction, one of which is the input shaft side and the other is the output shaft side. A plurality of resistance plates engaging in the rotational direction
A coupling device comprising a working chamber that hermetically surrounds these resistance plates, and a viscous fluid filled in the working chamber, wherein an input shaft side integrally rotating member and an output shaft side of a housing forming the working chamber are provided. At least one of the integral rotating member and the outer member is formed by press-molded inner and outer members, and the inner member is provided with an engagement portion with which the resistance plate is engaged.

[Operation] In such a device, at least one of the input shaft side and the output shaft side of the housing that defines the working chamber can be constituted by an inner and an outer formed by press molding, so that the production can be facilitated and the weight can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The output shaft 3 is integrally provided with a coupling cover 11, and constitutes a housing that partitions the working chamber 27 together with the inner hub 7 on the input shaft side. This coupling cover 11
Is an outer 13 and inner 15 formed by pressing a steel plate.
It is composed of To fix the outer 13 to the output shaft 3,
The boss portion 13a of the outer 13 is formed into an uneven shape in accordance with the spline 3a of the output shaft 3, and the boss portion 13a having the unevenness is fitted to the spline 3a of the output shaft 3.

After the inner 15 is fitted to the outer 13 and the joining portion C is integrated by means of welding or the like, a plurality of slits 17 are formed on the outer periphery of the inner 15 as an engaging portion having one side opening, The surplus 18 has a cantilever shape (see FIG. 2).

The coupling cover 11 is rotatably supported by the inner hub 7. The output side resistance plate 21 is engaged with the slit 17 provided in the inner 15, and the output side resistance plate 21
The input-side resistance plates 23 alternately combined with the engagement with the spline grooves 25 provided in the inner hub 7.

Each of the resistance plates 21 and 23 is provided in a working chamber 27 formed of the coupling cover 11 and the inner hub 7 and made liquid-tight by a seal 19, and a viscous fluid 29 is provided in the working chamber 27.
Is filled.

The viscous fluid 29 is made of, for example, silicon oil or the like, is injected from an oil inlet 31 provided on a side surface of the coupling case 11, and is covered with a plug 33 after completion of filling. Further, a spacer ring 35 is provided on the inner peripheral portion of the output-side resistive plate 21 and the outer peripheral portion of the input-side resistive plate 23 for maintaining the gaps between the resistive plates 21 and 23. Is composed.

With the above configuration, the rotation transmitted from the power transmission system to the input shaft 1 rotates the input-side resistance plate 23 via the inner hub 7 spline-coupled to the input shaft 1, and the output-side resistance plate 21 The rotational force is transmitted to the output-side resistance plate 21 by viscous resistance of the viscous fluid 29 filled in the gap f provided between the inner side 15 and the inner 15 constituting the coupling 11 with which the output-side resistance plate 21 is engaged. Output shaft 3 through the slit 17
To transmit power.

For this reason, the coupling device 37 transmits only a very small torque when there is a slight difference in the rotational speed between the input shaft 1 and the output shaft 3, whereas the coupling device 37 has an extremely large torque when there is a large difference in the rotational speed. It has the function of transmitting information.

When this coupling device 37 is arranged between the front axle and the rear axle in a power transmission system of a four-wheel drive vehicle, for example, the so-called tight corner braking phenomenon can be eliminated. That is, when the vehicle is put into a garage or the like while the steering is being steered, a difference occurs between the front wheel axle and the rear wheel axle due to an inner wheel difference, and a torsional torque acts on a propeller shaft and the like. This torsional torque overcomes the low torque of the engine such as when the vehicle is put into a garage and causes engine stall. This causes a so-called tight corner braking phenomenon. However, the input side resistance plate 21 provided on the input shaft 1 is located in the working chamber 27. When transmitting a rotational force to the output-side resistance plate 23 via the enclosed viscous fluid 29, the input side and the output side do not have a very slight rotational displacement, so the rotational difference is absorbed by the viscous fluid.

For this reason, the tight corner braking phenomenon can be prevented, and the coupling device 37 is formed by press-forming a steel plate, so that the coupling device 37 is small and lightweight, and can provide a large living space while securing the ground clearance of the vehicle. Therefore, application to a small car is very easy.

Further, since the coupling cover 11 can be press-molded, the production is extremely easy and the production can be performed at low cost.

When the engaging portion is the slit 17, it can be easily formed by punching, and the excess thickness 18 on both sides of the slit 17 is elastically deformed to exhibit a damping action.

The present invention is not limited to the above embodiment. For example, the inner hub 7 or only the inner hub 7 may be formed by the press-formed inner and outer. In other words, the inner hub 7 of the forged machined product shown in FIG. 1 is replaced with an inner provided with an engaging portion for engaging with the input-side resistance plate 23, and integrated with the inner by welding or the like after insertion. This is a press-formed product including an outer that is spline-fitted to the input shaft 1. In this case, the size and weight can be reduced by using the inner hub as a press-formed product. The engagement portion may be formed by forming a plate with irregularities in the circumferential direction instead of the slit.

[Effects of the Invention] As is clear from the above description, according to the configuration of the present invention, manufacture is easy, and reduction in size and weight can be achieved. Therefore,
It can be easily adopted in small cars.

[Brief description of the drawings]

1 and 2 show an embodiment of the coupling device according to the present invention. FIG. 1 is an overall sectional view of the coupling device, and FIG. 2 is a perspective view of an inner case. (Description of reference numerals indicating main parts in the drawings) 1... Input shaft, 3... Output shaft 11... Coupling cover 13... Outer, 15... Inner 17... Slit (engaging portion) 21. Side resistance plate, 23 ... Input side resistance plate 27 ... Working chamber, 29 ... Viscous fluid 37 ... Coupling device

Claims (2)

(57) [Claims] An input shaft for receiving a rotational input and an output shaft for extracting a rotational force are alternately arranged in the axial direction, one of which engages with the input shaft and the other engages with the output shaft in the rotational direction. A plurality of resistance plates, a working chamber that hermetically surrounds the resistance plates, and a viscous fluid filled in the working chamber, wherein the input shaft side of a housing that forms the working chamber. A coupling device, wherein at least one of the integral rotating member and the output shaft-side integral rotating member is formed of a press-formed inner and an outer, and the inner is provided with an engaging portion with which the resistance plate is engaged. 2. The coupling device according to claim 1, wherein said engaging portion is a slit.