JP3614520B2 - Wheel bearing device - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a wheel bearing device, and more particularly to a bearing device suitable for use in a guide wheel that guides horizontal movement of a heavy object such as a dome roof.
[0002]
[Prior art]
As a device for horizontally moving a heavy object such as a dome roof in an openable and closable manner, a device using a hydrostatic bearing that reduces frictional resistance by a fluid pressure such as air or water is known. 5 and 6, reference numeral 1 denotes an outer wall that surrounds the stadium, and a traveling path 3 of a dome roof 2 is formed on the top. The traveling path 3 is composed of a vertical wall 3a that supports the dome roof 2 from the side and a road surface 3b on which the dome roof 2 is placed, and rest receiving portions 5a are arranged on the road surface 3b at predetermined intervals in the moving direction of the dome roof 2, A rail 4 extending in the moving direction of the dome roof 2 is provided on the vertical wall 3a.
[0003]
Rests 5 and hydrostatic bearings 6 are arranged at predetermined intervals on the lower surfaces of both edge portions of the dome roof 2, and jack portions for raising and lowering the dome roof 2 are provided on the hydrostatic bearings 6. The hydrostatic bearing 6 is provided with a seal or the like for holding the water pressure supplied to the ground contact surface with the road surface 3b when the dome roof 2 is moved. When the jack portion is extended, the static pressure bearing 6 is grounded to the road surface and the rest 5 is separated from the rest receiving portion 5a. While the dome roof 2 is raised to a height, when the jack portion is contracted, the rest 5 is seated on the rest receiving portion 5a, and the dome roof 2 is lowered to a height at which the ground contact surface is separated from the road surface 3b.
[0004]
The hydrostatic bearing 6 supports a vertical load, but does not have a drag in the horizontal direction. Therefore, the horizontal movement of the dome roof 2 is caused by a load in the lateral direction (deformation that the lower end side tends to spread from the shape of the dome roof, wind pressure, etc. Guide wheels 7 that roll on the rails 4 are provided on the side surfaces of both edges of the dome roof 2 in order to guide while supporting more horizontal force.
[0005]
7 and 8 show a bearing device for a wheel that rolls on a rail. Reference numeral 10 denotes a pair of opposing brackets. An axle 12 is penetrated by a pair of brackets 10 fixed to the base 11, and between the brackets 10. A wheel 14 is rotatably mounted on the axle 12 via a rolling bearing 13. The rolling bearing 13 is fixed in the axial direction between the bracket 10 on the axle 12 via a spacer 15 a and a collar 16, and is tightened to the wheel 7 side by a bolt 18 via a spacer 15 b and a cover 17.
[0006]
The axle 12 is coupled to the bracket 10 by a key plate 19 so as not to rotate and move in the axial direction. That is, the wheel 14 is rotatably supported on the axle 12 fixed to the bracket 10 via the rolling bearing 13 in a state in which the movement in the axial direction is suppressed by the collar 16 and the cover 17.
[0007]
[Problems to be solved by the invention]
In such a bearing device, since the wheel 14 is fixed in the axial direction, when the bracket 10 moves in the axial direction, the wheel 14 also moves together. Therefore, there has been a problem that a relative slip occurs between the wheel 14 and the rail in the axial direction. In the moving device for the dome roof 2, a jack portion is provided between the dome roof 2 and the hydrostatic bearing 6, and this is connected to an accumulator so that it functions as a suspension. When the above-described bearing device is applied, the rolling resistance of the wheel 7 increases due to the sliding of the guide wheel 7 with respect to the rail 4 in the vertical direction as the jack moves up and down, and the wear of the rail 4 and the like may be significantly accelerated. there were.
[0008]
An object of the present invention is to solve such problems.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, shaft holes are formed coaxially in a pair of opposing brackets, and the axles are slidably supported in the shaft holes via bushes, and on the axles between the brackets. A rolling bearing is fixed, and a wheel is tightened in an axial direction on the outer periphery of the bearing, while a predetermined gap that allows the axle to slide is set between the wheel and a bracket facing both surfaces thereof.
[0010]
In the invention of claim 2, the large diameter portion is formed on one end side of the axle according to the invention of claim 1, the rolling bearing is inserted from the small diameter side and applied to the step portion of the axle, and the rolling bearing is interposed between the step portion. As a means for fixing in the axial direction, a cylindrical member having a diameter equal to or larger than that of the large diameter portion is fitted from the small diameter side of the axle.
[0011]
In the invention of claim 3, the wheel in the invention of claim 1 or claim 2 is a guide wheel for guiding the horizontal movement along the rail while supporting a load in the lateral direction of a heavy object such as a dome roof. Constitute.
[0012]
[Action]
According to the first aspect of the present invention, the wheel is rotatably supported on the axle through the rolling bearing while restraining the movement in the axial direction, but the axle is slidable in the axial direction via the bush on the bracket. Therefore, when the bracket moves in the axial direction, the predetermined gap moves in the axial direction together with the axle. Therefore, even if the bracket moves in the axial direction, the axle slides between the brackets, so that it is possible to prevent the rail from sliding on the rail in the axial direction.
[0013]
According to the invention of claim 2, the rolling bearing between the stepped portion on the axle is easily and easily assembled in a state where it does not move in the axial direction by fitting the cylindrical member. Since the cylindrical member has a diameter equal to or greater than that of the large diameter portion, the surface pressure of the bush is equal to or less than that of the large diameter portion, and the axle can be well supported by the bracket.
[0014]
According to the invention of claim 3, since the guide wheel moves in the axial direction together with the axle following the vertical movement of the heavy object, a large frictional force is not generated between the guide wheel and the rail. Rolling resistance and wear can be greatly reduced.
[0015]
Embodiment
1 and 2, a pair of opposing brackets 20 are attached to a base 21, and a boss portion 22 of an axial hole is formed on each bracket 20 on the same axis. An axle 24 is supported in these shaft holes through a bush 23 so as to be slidable in the axial direction, and a wheel 26 that rolls a rail on the axle 24 between the brackets 20 is rotatably attached via a rolling bearing 25. Reference numeral 27 denotes a bolt for fixing the bush 23 to the boss portion 22.
[0016]
A large diameter portion 24a penetrating the bush 23a of the bracket 20 is formed on one end side of the axle 24, and the rolling bearing 25 is inserted from the small diameter side to the step portion with the large diameter portion 24a on the outer periphery of the axle 24. It is clamped by the cylindrical member 28 so as not to move in the axial direction. The cylindrical member 28 is formed with a bottom having a diameter equal to or larger than that of the large-diameter portion 24a of the axle 24. The cylindrical member 28 is fitted to the axle 24 from the small-diameter side penetrating the bush 23b of the bracket 20, and is attached to the end surface of the axle 24 by a bolt 28a at the bottom. Combined.
[0017]
The rolling bearing 25 is inserted into the wheel 26 from the opposite side of the locking step portion 26 a, and the cover 29 is tightened with a bolt 30 on one side of the wheel 26, whereby the wheel 26 is axially moved between the locking step portion 26 a and the cover 29. Fixed to. A predetermined gap m that allows the axle 24 to slide is set between both surfaces of the wheel 26 and the boss portion 22 of the bracket 20. Reference numeral 31 denotes a passage for guiding lubricating oil to the rolling bearing 25.
[0018]
With such a configuration, the wheel 26 is supported on the axle 24 via the rolling bearing 25 so as to be freely rotatable and not moved in the axial direction. However, the axle 24 is supported by the bracket 20 in the axial direction via the bushes 23a and 23b. Since the slide is possible, when the bracket 20 moves in the axial direction, the predetermined gap m moves in the axial direction together with the axle 24. Therefore, even if the bracket 20 moves in the axial direction, the axle 24 slides between the brackets 20, so that it is possible to prevent the wheels 26 from sliding on the rail in the axial direction.
[0019]
The rolling bearing 25 on the axle 24 is simply and easily assembled in a state where it does not move in the axial direction between the stepped portion 24 b by fitting the cylindrical member 28. Further, since the cylindrical member 28 is equal to or larger than the same diameter as the large diameter portion 24a of the axle 24, the surface pressure of the bush 23b is equal to or less than that of the bush 23a, and the axle 24 can be favorably supported by the bracket 20.
[0020]
3 and 4 illustrate an embodiment applied to a moving device for the dome roof 2, and a rail 4 extending in the moving direction of the dome roof 2 is fixed to the vertical wall 3 a of the traveling path 3, and both the dome roofs 2 are fixed. The guide wheel 7 that rolls the rail 4 on the side surface of the edge is supported via the same bearing device as in FIGS. Since the configuration of the moving device is the same as in FIGS. 5 and 6, the same reference numerals are given to the same components, and a duplicate description is omitted. In addition, 6a is added and the jack part of the hydrostatic bearing 6 is shown.
[0021]
In this case, even if the dome roof 2 moves up and down as the jack portion 6a moves up and down, the guide wheel 7 does not move in the axial direction together with the axle 24 following the movement. Without generating a large frictional force between the rails 4, the rolling resistance of the wheels 7 and the amount of wear can be greatly reduced. n indicates a gap between the rest and the rest receiving portion caused by the lift-up of the jack portion 6a.
[0022]
【The invention's effect】
In short, according to the present invention, even if the bracket of the wheel moves in the axial direction, the axle slides between the brackets, so that it is possible to effectively avoid the rail sliding on the rail in the axial direction. For this reason, when a heavy load moving device such as a dome roof is applied as a guide wheel bearing device that guides horizontal movement along a rail while supporting a lateral load of the heavy load, a large frictional force is generated between the guide wheel and the rail. There is an effect that the rolling resistance and the amount of wear of the wheel can be reduced without generating.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a partial front view facing the moving direction of the dome roof.
FIG. 4 is a partial side view along the moving direction of the dome roof.
FIG. 5 is a partial plan view illustrating a moving device for a dome roof.
FIG. 6 is a cross-sectional view illustrating a moving device for a dome roof.
FIG. 7 is a sectional view of a bearing device for explaining a conventional example.
8 is a view taken in the direction of arrow B in FIG.
[Explanation of symbols]
2 Dome roof 3a Vertical wall 4 Rail 6 Hydrostatic bearing 7 Guide wheel 20 Brackets 23a, 23b Bush 24 Axle 24b Stepped portion 25 Rolling bearing 26 Wheel 28 Cylindrical member 29 Cover

Claims (3)

Shaft holes are formed coaxially in a pair of opposing brackets, and the axles are slidably supported in these shaft holes via bushes, and rolling bearings are fixed on the axles between the brackets. An axle bearing device, wherein a wheel is fitted to the outer periphery of the bearing, and a predetermined clearance is set between the wheel and a bracket facing both surfaces to allow the axle to slide. A large-diameter portion is formed on one end of the axle, and the rolling bearing is inserted from the small-diameter side and applied to the stepped portion of the axle. The bearing device according to claim 1, wherein the cylindrical member is fitted from the small diameter side of the axle. 3. The bearing device according to claim 1, wherein the wheel is configured as a guide wheel that guides horizontal movement along a rail while supporting a lateral load of a heavy object such as a dome roof.

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