Machine element or mechanism – Gearing – Lubrication
Patent
1990-12-07
1992-04-28
Herrmann, Allan D.
Machine element or mechanism
Gearing
Lubrication
74606A, 184612, 1841041, 475 83, F16H 5704, F01M 900
Patent
active
051077183
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a hydraulic motor combined with a speed reducer used, for example, as a motor for driving a power shovel.
BACKGROUND OF THE INVENTION
It is well known that a combined hydraulic motor and speed reducer conventionally includes a motor case, a cylindrical rotatable member rotatably supported on the outer periphery of the motor case, and a speed reducer arranged to provide a connection between a rotary shaft of the hydraulic motor and the cylindrical rotatable member. A cover is attached to an open end of the cylindrical rotatable member to form a closed speed reducer case. Lubricating oil is supplied to the speed reducer case to lubricate the speed reducer in an oil bath.
In such a conventional combined hydraulic motor and speed reducer, the hydraulic motor is fixed in position, and the cylindrical rotatable member is connected to a drive sprocket. The cylindrical rotatable member is rotated to drive the drive sprocket and lubricate the speed reducer in an oil bath. By this arrangement, the lubricating oil is stirred within the speed reducer case while the motor is being rotated. This may result in an increase in the temperature or the overheat of the lubricating oil and thus, in a decrease in the service life of seal means such an O-ring, an oil seal and a floating seal and bearings. Therefore, the hydraulic motor can not be rotated in an continuous manner.
SUMMARY OF THE INVENTION
In view of the foregoing, it is a primary object of the present invention to provide a combined hydraulic motor and speed reducer which increases the service life of sealing members and bearings by supplying lubricating oil to a speed reducer case and at the same time, discharging the same out of the speed reducer case so as to maintain the lubricating oil within the speed reducer case at low temperature.
Another object of the present invention is to provide a combined hydraulic motor and speed reducer designed to provide a larger contact area between a motor case and lubricating oil so as to effectively cool the lubricating oil within a speed reducer case.
In order to achieve the foregoing objects, according to a first aspect of the present invention, there is provided a combined hydraulic motor and speed reducer including a cylindrical rotatable member having one open end rotatably supported on the outer periphery of a motor case and the other open end closed by a cover member to provide a speed reducer case, a speed reducer arranged within the speed reducer case and adapted to provide a connection between a rotary shaft of the motor and the cylindrical rotatable member, and lubricating oil supplied to the speed reducer case to lubricate any rotatable parts mounted therewithin, the combined hydraulic motor and speed reducer comprising a pair of supply/discharge ports formed in the peripheral wall of the motor case in a diametrically opposite relationship and extending axially from one end of the motor case so as to open to the speed reducer case.
Also, in order to achieve the foregoing objects, according to a second aspect of the present invention, there is provided a combined hydraulic motor and speed reducer including a cylindrical rotatable member having one open end rotatably supported on the outer periphery of a motor case and the other open end closed by a cover member to provide a speed reducer case, a speed reducer arranged within the speed reducer case and adapted to provide a connection between a rotary shaft of the motor and the cylindrical rotatable member, and lubricating oil supplied to the speed reducer case to lubricate any rotatable parts mounted therewithin, the combined hydraulic motor and speed reducer comprising a plurality of heat exchange fins extending one end of the motor case into the speed reducer case and arranged in a circumferentially equally spaced relationship.
With the present invention, lubricating oil is supplied to the speed reducer case through the supply port and discharged from the speed reducer case through the discharge por
REFERENCES:
patent: 1739779 (1929-12-01), Blood
patent: 3870907 (1975-03-01), Hoffman
patent: 3972659 (1976-09-01), Bosch et al.
patent: 4040312 (1977-08-01), Tappan et al.
patent: 4523632 (1985-06-01), Nobukawa et al.
patent: 4751858 (1988-06-01), Iwatsuki
Herrmann Allan D.
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
Laub David W.
LandOfFree
Combined hydraulic motor and speed reducer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combined hydraulic motor and speed reducer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined hydraulic motor and speed reducer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1239716