JP2638986B2 - Viscous coupling device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous coupling device, and more particularly, to a viscous coupling device capable of satisfactorily lubricating a portion requiring lubrication outside a viscous coupling bearing.

[Conventional technology]

Transmits the driving force of the internal combustion engine to the front wheel drive axle and the rear wheel drive axle in order to improve the running performance and safety in all running conditions including normal running on rough roads as well as running on rough roads and rough terrain. Many types of so-called four-wheel drivers for driving all wheels have appeared. In this four-wheel drive vehicle, as shown in FIG. 6, a transfer 6 is connected to a transmission 4 of the internal combustion engine 2, and the transfer 6 forms a front wheel driving propulsion shaft 8 and a rear wheel driving propulsion shaft 10. The driving force of the internal combustion engine 2 is distributed and transmitted to a front wheel drive axle and a rear wheel drive axle (not shown).

Such a four-wheel drive vehicle is disclosed in Japanese Patent Application Laid-Open No. 61-191431.
As disclosed in Japanese Patent Application Laid-Open Publication No. H10-209, a friction multi-plate type clutch is interposed between the front wheel and the rear wheel, and the transmission torque of the clutch is changed based on the rotational speed difference between the front wheel and the rear wheel to reduce the driving force. Some control the distribution ratio. Also, JP-A-61-19
As disclosed in Japanese Patent No. 1434, an internal combustion engine is connected to one of the front wheel and the rear wheel to constantly transmit the driving force, and the other wheel has a difference in rotation speed between the input side member and the output side member. A differential limiting clutch that becomes a coupling state when it becomes large,
There is one in which the internal combustion engine is connected via a so-called viscous coupling. Further, as disclosed in Japanese Patent Application Laid-Open No. 61-278625, in a vehicle provided with a viscous coupling, a viscous coupling is used to form a plate that can be deformed due to a temperature change of a viscous working fluid filled in the viscous coupling. Are interposed between the outer plate and the inner plate.

As described above, the viscous coupling device interposed between the two rotating shafts transmits the torque from one rotating shaft to the other rotating shaft according to the difference in the rotating speed between the two rotating shafts. As shown in FIG. 7, a viscous coupling 12 is interposed between a driven rotation shaft (not shown) of the transfer 6 and a front wheel driving propulsion shaft 8 as shown in FIG. As described above, there is a vehicle in which a viscous coupling 12 is interposed between a rear wheel drive propulsion shaft 10 and an input shaft (not shown) of a rear final reduction gear 14. Note that reference numeral 16 is
Rear axle tube.

[Problems to be solved by the invention]

By the way, as shown in FIG. 7, in a viscous coupling device in which a viscous coupling 12 is interposed between a driven-side rotating shaft (not shown) of the transfer 6 and a front-wheel driving propulsion shaft 8, -It is configured as shown in Fig. 5. In the figure, 6 is a transfer, and 12 is a viscous coupling. In the transfer 6, a chain 18 wound around a driving sprocket of a driving rotating shaft (not shown) is wound around a driven sprocket 20. The driven-side sprocket 20 has a driven-side rotating shaft
Mounted on 22. The viscous coupling 12 is interposed between the driven-side rotating shaft 22 as one of the rotating shafts and the front-wheel driving propulsion shaft 8 as the other rotating shaft. The chain 18, the driven sprocket 20, and the driven rotary shaft 22 of the transfer 6 are formed by a first housing 24 and a second housing 44.
And is encapsulated by The viscous coupling 12 is enclosed by the second housing 44 and the third housing 50.

As a result, the driven-side rotating shaft 22 has one end supported by the first housing 24 by the driven-side rotating bearing 26 and the other end connected to the second housing 44 by the first inner bearing 34 and the first outer bearing. It is pivoted through 46. The viscous coupling 12 has an outer periphery on one end side of the outer case 32 supported by a second housing 44 by a first outer bearing 46, and an output shaft 48 provided outside the other end side of the outer case 32.
Are supported on the third housing 50 by a second outer bearing 52. An output shaft provided outside the other end of the outer case 32
A seal 54 and a bush 56 are provided between the third housing 50 and the outer periphery of one end of the front wheel driving propulsion shaft 8 located outside the second outer bearing 52 that supports the shaft 48. I have.

In such a viscous coupling device, the inner surface 24a of the first housing 24 and the inner surface 4
The lubricating oil 60 is stored at a height of the oil level 1 in a space below the space formed by the inner surface 50a of the third housing 50 communicating with the inner surface 50a of the third housing 50 communicating with the through hole 58 formed below the second housing 44. The lubricating oil 60 is scraped up by the chain 18 and supplied to lubrication-required parts such as bearings to perform lubrication.

However, in the viscous coupling device shown in FIG. 4, the lubricating oil 60 scraped up by the chain 18 escapes from the through hole 58 of the second housing 44 and the first outer bearing 46, and the viscous coupling 8 There is an inconvenience that it is difficult to satisfactorily lubricate the bush 56 located outside by the second outer bearing 52 that supports the output shaft 48 provided outside the other end of the outer case 32. Therefore, as in a viscous coupling device shown in FIG. 5, a second outer bearing 52 of the outer case 32 of the viscous coupling 8 passes through the inner surface 50a above the third housing 50 and opens at the start end inside the second housing 44. In some cases, a lubricating oil guide tube 62 having a terminal opening is attached to a bush 56 located outside of the bush.

However, the lubricating oil guide tube 62 and the lubricating oil guide tube 62
The need for the fixture 64 for mounting the lubrication oil increases the number of parts, which is disadvantageous.
A second housing 44 and a third housing for mounting 62
The necessity of changing the shape of 50 has a disadvantage that the structure becomes complicated and large. As a result, there is a disadvantage that the cost increases.

[Object of the invention]

Therefore, an object of the present invention is to provide a viscous coupling device capable of satisfactorily lubricating a required lubrication portion without increasing the number of parts, complicating the structure and increasing the size thereof, and without increasing the cost. Is to make it happen.

[Means for solving the problem]

In order to achieve this object, the present invention provides a viscous coupling interposed between two rotating shafts, whereby a rotational force is applied from one rotating shaft to the other rotating shaft according to the difference in the rotating speed between the two rotating shafts. In the viscous coupling device, the lubricating oil scattered in the circumferential direction of the inner surface of the housing enclosing the viscous coupling by rotation of the viscous coupling is resiliently mounted on the inner surface of the housing in order to guide the lubricating oil to the lubrication required portion. Helical lubricating oil guiding means is provided.

[Action]

According to the configuration of the present invention, the spiral lubricating oil elastically mounted on the inner surface of the housing so as to guide the lubricating oil scattered in the inner circumferential direction of the inner surface of the housing enclosing the viscous coupling to the lubrication requesting portion By providing the guide means, the lubricating oil guiding means can be mounted on the housing without the need for a fixture or the like, and it is not necessary to change the shape of the housing to mount the lubricating oil guiding means.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention.
In FIG. 1, 6 is a transfer, and 12 is a viscous coupling. In the transfer 6, a chain 18 wound around a drive image sprocket of a drive-side rotating shaft (not shown) is wound around a driven sprocket 20. The driven-side sprocket 20 has a driven-side rotating shaft
Mounted on 22. The driven side rotation shaft 22 is
One end of the inner shaft 28 of the viscous coupling 12 is supported at one end by a driven-side rotary shaft bearing 26 in a first housing 24 partially enclosing the driven sprocket 20 and the driven-side rotary shaft 22. It is connected to one end. The thinner shaft 28 has the other end as a free end and a plurality of inner plates 30 provided on the outer peripheral surface.

The inner shaft 28 has a viscous coupling 12
Outer case 32 is externally fitted so as to be relatively rotatable.
That is, the outer periphery of one end of the inner shaft 28 and the outer case 32
Of the inner shaft 28 and the inner periphery of the other end of the outer case 32 are supported by a second inner peripheral bearing 36. A seal 38 is provided between the outer periphery of one end of the inner shaft 28 and the inner periphery of one end of the outer case 32 so as to be located outside the first inner bearing 34. A plurality of outer plates 40 alternately arranged with the inner plate 30 are provided on the inner peripheral surface of the outer case 32, and a viscous space is formed between the inner shaft 28 and the outer case 32 in a liquid-tightly defined space. Is filled with a working fluid 42 having

The outer case 32 is supported at one end outer periphery by a first outer bearing 46 on a second housing 44 partially enclosing the chain 18, the driven sprocket 20, the driven rotating shaft 22, and the outer case 32, An output shaft 48 provided outside the other end is supported by a third outer housing 52 in a third housing 50 that partially covers the outer case 32.

As a result, the driven-side rotating shaft 22 to which the driven-side sprocket 20 is attached is supported at one end by the driven-side rotating shaft bearing 26 on the first housing 24 and at the other end by the second housing 44. It is pivotally supported via a first inner bearing 34 and a first outer bearing 46. An output shaft 48 provided outside the other end of the outer case 32 is connected to one end of the front wheel driving propulsion shaft 8 which is the other rotation shaft. The third housing is provided on the outer periphery of one end side of the front wheel driving propulsion shaft 8 located outside of the second outer bearing 52 which supports the output shaft 48 provided outside the other end side of the outer case 32. A seal 54 and a bush 56 are provided therebetween.

In such a viscous coupling device, the inner surface 24a of the first housing 24 and the inner surface 4
A lubricating oil 60 is stored at a height of an oil level 1 in a space below a space formed by the inner surface a of the third housing 50 communicating with a through hole 58 formed below the second housing 44. The lubricating oil 60 is scraped up by the chain 18 and supplied to lubrication-required parts such as bearings to perform lubrication.
At this time, the second outer bearing that supports the output shaft 48 provided on the outer peripheral portion on the other end side of the outer case 32 of the viscous coupling 12.
There is an inconvenience that it is difficult to lubricate the bush 56, which is a lubrication requesting portion located outside of the bushing 52, satisfactorily.

Therefore, the third housing enclosing the viscous coupling 12 by the rotational force of the viscous coupling 12
In order to guide the lubricating oil scattered in the circumferential direction of the inner surface 50a of the inner surface 50 to the bush 56 which is a lubrication demanding portion located outside the second outer bearing 52 of the viscous coupling 12, the inner surface of the third housing 50 A spiral lubricating oil guiding means 66 is mounted on the 50a by elastic pressure.

As shown in FIGS. 2 and 3, the lubricating oil guiding means 66 uses a base end 68 on the second housing 44 side and a compression reaction force F continued to the base end 68 to form the third housing 50. Inner surface 50a
A spiral intermediate portion 70 that is resiliently mounted on the second outer bearing 52 of the viscous coupling 12 that is continuous with the intermediate portion 70.
And a tip portion 72 which reaches the bush 56, which is a lubrication requesting portion located outside.

 Next, the operation will be described.

When the viscous coupling 12 rotates, the stored lubricating oil 60 is removed by the wind pressure of the rotation.
It is scattered in the circumferential direction on the inner surface 50a of the third housing 50 that encloses 12. The lubricating oil guiding means 66 is mounted on the inner surface 50a of the third housing 50 by using a compression reaction force to resiliently press the lubricating oil 60, as shown in FIG. The spiral guide recess 74 formed at the portion where the lubricating oil guide means 66 abuts the lubricating oil guiding means 66 guides the distal end portion 72 to the bush 56.

As a result, the outer case of the viscous coupling 12
The lubrication of the bush 56 located outside of the second outer bearing 52 that supports the output shaft 48 provided outside the other end of the 32 can be favorably performed.

Thus, the third encapsulating the viscous coupling 12
Lubricating oil 6 scattered in the circumferential direction on the inner surface 50a of the housing 50
0 to the bush 56, which is a lubrication demanding portion, located outside the second outer bearing 52 of the viscous coupling 12,
By providing the spiral lubricating oil guiding means 66 which is elastically mounted on the inner surface 50a of the third housing 50, the lubricating oil guiding means 66 can be mounted on the third housing 50 without the need for a conventional fixing tool or the like. At the same time, it is not necessary to change the shape of the third housing 50 in order to mount the lubricating oil guiding means 66.

For this reason, the lubrication-required portion located outside the second outer bearing 52 of the viscous coupling 12 without increasing the number of parts or increasing the complexity and size of the structure, thereby increasing the cost. Lubricating oil can be guided to the bush 56, and lubrication can be performed well. In the above-described embodiment, the case where the viscous coupling is interposed between the two rotation shafts has been described. However, the case where the vane pump type coupling is interposed can be similarly implemented.

〔The invention's effect〕

As described above, according to the present invention, the helical spirally mounted inside the housing so as to guide the lubricating oil scattered in the circumferential direction on the inner surface of the housing enclosing the viscous coupling to the lubrication requesting portion. By providing the lubricating oil guiding means, the lubricating oil guiding means can be mounted on the housing without the need for a fixture or the like, and the housing need not be changed in shape to mount the lubricating oil guiding means.

For this reason, the number of parts can be reduced and simplification and downsizing can be achieved without increasing the number of parts or complicating or increasing the size of the structure. The lubricating oil can be guided to the lubrication requesting part and lubrication can be performed well.

[Brief description of the drawings]

1 to 3 show an embodiment of a viscous coupling device according to the present invention. FIG. 1 is an enlarged sectional view of a main part of a transfer portion, FIG. 2 is a side view of lubricating oil guiding means, and FIG. It is explanatory drawing of guidance of lubricating oil by guidance means. 4th
FIG. 5 is an enlarged sectional view of a main part of a transfer portion of a viscous coupling device showing a conventional example. 6 and 7 are schematic explanatory diagrams of the transfer, respectively, and FIG. 8 is a schematic explanatory diagram of the rear final reduction gear. In the figure, 2 is an internal combustion engine, 4 is a transmission, 6 is a transfer, 8 is a front wheel driving propulsion shaft, 10 is a rear wheel driving propulsion shaft, 12 is a viscous coupling, 22 is a driven side rotation shaft,
Is a first housing, 26 is a driven-side rotary shaft bearing, 28 is an inner shaft, 32 is an outer case, 34 is a first inner bearing, 36 is a second inner bearing, 44 is a second housing, and 46 is a first outer shaft bearing. , 48 is an output shaft, 50 is a third housing, 52 is a second outer shaft bearing, 56 is a bush, 60 is lubricating oil, 66 is lubricating oil guiding means, 68 is a base end portion, 70 is an intermediate portion, and 72 is a distal end. Department.

Claims (1)

(57) [Claims] A viscous coupling for transmitting a rotational force from one rotation shaft to another rotation shaft in accordance with a difference in rotation speed between the two rotation shafts by viscous couplings interposed between the two rotation shafts. In the coupling device, a helical shape elastically mounted on the inner surface of the housing so as to guide lubricating oil scattered in an inner circumferential direction of an inner surface of the housing enclosing the viscous coupling to the lubrication request site by rotation of the viscous coupling. A viscous coupling device provided with a lubricating oil guiding means.