Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Cylinders parallel to rotation axis
Patent
1990-01-16
1992-11-24
Bertsch, Richard A.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Cylinders parallel to rotation axis
384517, F01B 1304, F16C 1938
Patent
active
051653214
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL ART FIELD OF THE INVENTION
This invention relates to a main bearing device for a bent axis type axial piston pump/motor by which the main shaft thereof can be rotatingly borne.
BACKGROUND ART OF THE INVENTION
In general, for example, as shown in FIG. 1, a bent axis type axial piston pump/motor has been heretofore constructed such that a shaft 2 is rotatingly borne through a main bearing device 3 to a housing 1, that a central support pintle 5 supported by a cylinder block 4 and tilted at a predetermined tilt angle .theta. with respect to the shaft 2 is tiltably connected to the shaft 2, and that pistons 7 slidingly inserted into cylinder holes 6, respectively, of the cylinder block 4 are tiltably connected to the shaft 2.
In such a bent axis type axial piston pump/motor as described above, since the pistons 7 are connected to the shaft 2 at a position where the pistons 7 are offset in the outer peripheral side of the axis of the shaft 2, and further the pistons 7 are tilted with respect to the axis of the shaft 2, the pistons 7 are thrusted against the shaft 2 by a force F.sub.1 in the direction shown by an arrow due to a hydraulic pressure within the cylinder holes 6. As a result, a thrust load and a radial load are acted on the shaft 2.
Therefore, the main bearing device 3 is constructed such that first and second bearings 8 and 9 of a conical roller type are disposed in a tandem arrangement, and that both the thrust load and the radial load can be received continuously by connecting inner races 8a, 9a of the first and the second bearings 8, 9 and outer races 8b, 9b of the first and the second bearings 8, 9 through an inner wheel seat 10 and an outer wheel seat 11, respectively.
In such a main bearing device 3 as described above, the thrust load Fa equally acting to the first and the second bearings 8, 9 as indicated by an arrow of perforated line in FIG. 2, but the radial load Fr.sub.1 acting on the first bearing 8 becomes greater than the radial load Fr.sub.2 acting on the second bearing 9, because the radial loads are acting tiltingly on positions, respectively, which are offset from the axis of each roller.
Therefore, the total load acting on the first bearing 8 becomes greater than that acting on the second bearing 9. As a result, the life of the first bearing becomes shorter, and hence the life of the main bearing device becomes shorter.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above-mentioned circumstances, and has for its aim to provide a main bearing device for a bent axis type axial piston pump/motor in which the sum the thrust loads and the radial loads acting on a first bearing and a second bearing, respectively, disposed in a tandem arrangement in the axial direction of the main bearing device, that is, the respective total loads act equally on the first and the second bearings.
In order to achieve the above-described aim, according to a main aspect of the present invention, there is provided a main bearing device for a bent axis type axial piston pump/motor having a main shaft rotatably arranged within a housing thereof; a cylinder block connected through a tiltable central support pintle to a proximal end of the main shaft at a predetermined tilt angle with respect to the main shaft; and a plurality of tiltable pistons slidingly inserted into a plurality of cylinder holes formed in the cylinder block so as to extend in the axial direction thereof, respectively, their respective leading ends being connected to the proximal end of the main shaft; the main bearing device comprising a first bearing and a second bearing, wherein in order to bear the main shaft rotatably within the housing, these first and second bearings are disposed in a tandem arrangement in the axial direction of the main bearing device between the housing and the main shaft through inner and outer wheel seats provided between the first and the second bearings, and the main bearing device being characterized in that a gap is defined between the inner side end surface of the
REFERENCES:
patent: 2404615 (1946-07-01), Boyd
patent: 3789740 (1974-02-01), Boyer
patent: 3900232 (1975-08-01), Rode
patent: 4085984 (1978-04-01), Cameron
patent: 4382399 (1983-05-01), Lotter
patent: 4569630 (1986-02-01), Eickmann
Arimoto Takeo
Nagahara Kazuyoshi
Ogata Takashi
Bertsch Richard A.
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
Korytnyk Peter
LandOfFree
Main bearing device for bent axis type axial piston pump/motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Main bearing device for bent axis type axial piston pump/motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Main bearing device for bent axis type axial piston pump/motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-915813