JPH053780Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a cooling structure for a viscous coupling used in a transfer device.

(Prior Art) Examples of conventional cooling structures for viscous cut springs include the following.

In other words, in the case of a transfer device equipped with a viscous cut spring, the lubricating oil stored in the transfer casing is scraped up by a chain installed between sprocket gears, and the lubricating oil is scattered. I was trying to cool it down.

(Problem that this invention aims to solve) However, in such a conventional cooling structure, since the viscous coupling spring is a viscous clutch, it generates a large amount of heat due to friction, and the amount of lubricating oil that can be pumped up by the chain is insufficient. Due to insufficient quantity, it was not possible to cool the viscous cut spring sufficiently. As a result, the temperature of the silicone oil filled in the viscous cut spring rises, resulting in a hump condition, and by repeating this, there is a problem in that the transmitted torque decreases.

(Means for Solving the Problems) This invention was made in view of the above-mentioned conventional problems, and its purpose is to provide a cooling structure that can sufficiently cool a viscous cut spring.

In order to achieve this object, this invention provides a hydraulic pump at one end of the input shaft in a transfer device that transmits the driving force of the input shaft to the front wheels via a viscous coupling spring. Lubricating oil is supplied from an oil passage formed inside the input shaft and in the casing of the viscous coupling to the inside of an oil cover attached to the viscous coupling to cool the viscous coupling.

(Function) In this invention, sufficient lubricating oil can be supplied to the viscous cut spring by the hydraulic pump through the oil passages formed in the main shaft and the casing of the viscous cut spring. Therefore, the viscous cut spring can be sufficiently cooled.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

FIGS. 1 and 2 are diagrams showing an embodiment of this invention.

First, to explain the configuration, in Figs. 1 and 2, 1 is the main shaft (input shaft);
Main shaft 1 is connected to casing 3 via bearing 2.
is rotatably supported. Main shaft 1
A sprocket gear 4 is rotatably supported via a bearing 5, and a chain 6 is installed between the sprocket gear 4 and a sprocket gear integrally formed on the front drive shaft. A hub 4A is integrally formed on the sprocket gear 4, and a clutch gear 7 is integrally formed on the main shaft 1.
are integrally formed.

8 is a viscous cut spring, and the viscous cut spring 8 has an outer plate 10 incorporated in its outer casing 9A and a main shaft 1.
It has an inner plate 11 incorporated in. Inner plates 11 and outer plates 10 are arranged alternately, and these plates 1
The outer casing 9A and inner casings 9B and 9C containing the 0 and 11 are filled with approximately 90% silicone oil. Outer plate 10
When a rotational difference occurs between the inner plate 11 and the inner plate 11, transmission of driving force is started due to the shear resistance of the silicone oil filling the space between them, and the larger the rotational difference, the larger the transmitted torque becomes. on the other hand,
12 is a coupling sleeve, and when the coupling sleeve 12 is in the 4WD full position, it engages with the hub 4A and also engages with the outer casing 9A. In addition, the coupling sleeve 12 is
When moving to the 4WD lock position, clutch gear 7
It's starting to fit together. Switching of the coupling sleeve 12 between the 4WD full position and the 4WD lock position is performed by moving a shift fork 13 provided to the shift rod via a spring.

Further, a plug member 15 is provided on one end side of the main shaft 1 via an oil seal 14, and a hydraulic pump 16 is incorporated within this plug member 15. An inlet 17 and an outlet 1 for lubricating oil (hereinafter referred to as oil) are in contact with the plug member 15.
A plug member 19 having a diameter of 8 is provided, and its outlet 18 communicates with a first oil passage 20 formed in the axial direction inside the main shaft 1 via a second oil passage 21 formed in a vertical direction. There is. Further, the first oil passage 20 is connected to the inner casing 9 of the viscous coupling ring 8 via third and fourth oil passages 22 and 23 formed vertically on the other end side of the main shaft 1.
It communicates with the fifth and sixth oil passages 24 and 25 formed at B and 9C, respectively. 5th and 6th oil passages 24, 2
5 is the outer casing 9 of the viscous cut spring 8
A and the inner casings 9B, 9C are respectively opened inside the oil covers 26, 27 provided to cover the oil covers 26, 27.

Next, the effect will be explained.

Hydraulic pump 1 from inlet 17 of plug member 15
The oil supplied to the hydraulic pump 6 is forced to be sent to the first oil passage 20 via the outlet 18 and the second oil passage 21 by the hydraulic pump 16. The oil pressure-fed to the first oil passage 20 passes through the third and fourth oil passages 22 and 23 and the fifth and sixth oil passages 24 and 25 to the oil covers 26 and 2.
7, respectively.

The oil supplied to the inside of the oil covers 26, 27 cools the outer casing 9A and the inner casings 9B, 9C of the viscous cut spring 8, and then exits through the outlet holes formed in the oil covers 26, 27.
8 and 29 to the recovery side, and returns to the hydraulic pump 16 through the inlet 17.

As described above, in this embodiment, since a sufficient amount of oil can be supplied to the viscous coupling ring 8, the viscous coupling ring 8 can be sufficiently cooled even if heat generation due to friction is large.
Therefore, it is possible to suppress an increase in the temperature of the silicone oil, and therefore it is possible to avoid a decrease in the transmitted torque due to a hump state.

(Effects of the invention) As explained above, since sufficient lubricating oil can be supplied to the viscous cut spring via the oil passage by the hydraulic pump, the viscous cut spring can be sufficiently cooled. As a result, the temperature rise of silicone oil can be suppressed,
It is possible to prevent the transmission torque from decreasing due to the viscous coupling spring being in a hump state.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a partial sectional view of a viscous coupling spring. 1... Main shaft (input shaft), 8... Viscous cut spring, 9A... Outer casing, 9
B, 9C...Inner casing, 16...Hydraulic pump, 20-25...1st to 6th oil passages, 26, 27
...Oil cover.

Claims (1)

[Scope of utility model registration request] In a transfer device that transmits the driving force of an input shaft to the front wheels via a viscous cut spring, a hydraulic pump is provided at one end of the input shaft, and lubricating oil from the hydraulic pump is transferred to the inside of the input shaft and to the viscous cut spring. A cooling structure for a viscous cut spring, characterized in that the viscous cut spring is cooled by supplying oil from an oil path formed in a casing to the inside of an oil cover attached to the viscous cut spring.