Motor vehicles – Power – Including traction motor of kind driven by noncompressible...
Patent
1995-06-08
1998-04-07
Johnson, Brian L.
Motor vehicles
Power
Including traction motor of kind driven by noncompressible...
180253, B60K 700
Patent
active
057353646
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a structure for lubricating each individual part of a wheel driving apparatus provided with a braking mechanism while coupling an output side of a hydraulic motor to a wheel via a reduction gear mechanism and a clutch mechanism.
BACKGROUND ART
In a wheel driving apparatus provided with a reduction gear mechanism, a clutch mechanism and a braking mechanism, there arises a need to be supplied with a lubricant oil for the purposes of lubricating and cooling each individual part therein.
To this end, it is conceivable that use is made of a conduit for connection to each of the decelerating mechanism, the clutch mechanism and the braking mechanism. This measure is, however, found to be disadvantageous in that an excessive number of conduits are required and a space for those conduits needs to be excessively enlarged.
The present invention has been made to obviate the conventional inconveniences mentioned above, and has an object of providing a lubricating structure for a wheel driving apparatus whereby those individual lubricable portions can be thoroughly lubricated and cooled only with a reduced number of conduits.
SUMMARY OF THE INVENTION
In order to achieve the foregoing and other objects, there is provided in accordance with the present invention and in one form thereof, a lubricating structure for a wheel driving apparatus in which a wheel hub on which a tire is mounted is rotatably supported by a wheel mounting body. An output side of a hydraulic motor that is attached to the rotary mounting body is coupled to a drive shaft which is engageably inserted into a shaft bore of the wheel mounting body. The drive shaft is coupled to the said wheel hub via a reduction gear mechanism and a clutch mechanism, and a braking mechanism is mounted between the wheel hub and the wheel mounting body.
The lubricating structure is characterized in that an annular space formed between the shaft bore and the drive shaft is communicated via individual lubricable portions with a lubricant oil inlet and a peripheral port, respectively. The lubricant oil is supplied from the lubricant oil inlet and is discharged from the port.
With the structure so constructed, the lubricant oil introduced into the annular space between the drive shaft and the shaft bore will be caused, by the action of a centrifugal force, to flow through those individual lubricable portions into the port and will then be discharge from the port. Accordingly, those individual lubricable portions can be thoroughly lubricated and cooled only with a reduced number of conduits.
In this connection, it should be noted that it is preferable that the above-mentioned lubricant oil inlet is formed in a cover having the afore-mentioned hydraulic motor attached thereto. Also, preferably, a gear containing portion should be provided between the afore-mentioned lubricant oil inlet and the afore-mentioned annular space.
Further, it is typical that the afore-mentioned wheel hub is supported by the afore-mentioned wheel mounting body via a bearing and that this bearing is located between the afore-mentioned annular space and the afore-mentioned port.
It is also preferable that the afore-mentioned braking mechanism should be positioned between the afore-mentioned annular space and the afore-mentioned port.
What is more, a discharging conduit should preferably be provided for connection with the afore-mentioned port.
The present invention also provides, in another form thereof, a lubricating structure for a wheel driving apparatus in which a wheel hub on which a tire is mounted is rotatably supported by a wheel mounting body. An output side of a hydraulic motor that is attached to the rotary mounting body is coupled to a drive shaft which is engageably inserted into a shaft bore of the wheel mounting body. The drive shaft is coupled to the wheel hub via a reduction gear mechanism and a clutch mechanism. And a braking mechanism is mounted between the wheel hub and the wheel mounting body.
The lubricating structure is characte
REFERENCES:
patent: 3439766 (1969-04-01), Dence et al.
patent: 4442729 (1984-04-01), Hayakawa
patent: 4468981 (1984-09-01), Ries
patent: 5156579 (1992-10-01), Wakuta et al.
patent: 5472062 (1995-12-01), Nagi et al.
Butts Jonathan E.
Johnson Brian L.
Kabushiki Kaisha Komatsu Seisakusho
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