Joints and connections – With adjunctive protector – broken parts retainer – repair,... – Position or guide means
Patent
1996-01-31
1999-01-05
Green, Brian K.
Joints and connections
With adjunctive protector, broken parts retainer, repair,...
Position or guide means
29525, 29894361, 403282, 403273, F16D 6510
Patent
active
058554440
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for centering a rotational unit, on a rotational hub. More specifically, the invention relates to a device wherein both the hub and the rotational unit have mounting surfaces for guiding the position of the rotational unit both axially and radially.
BACKGROUND OF THE INVENTION
In many applications it is of great importance that the rotating units are properly centered in relation to their axes of rotation. Such rotational units, which are mounted on a rotary hub via mounting surfaces, normally present centering surfaces, shaped as cylinder mantles, which are centered against corresponding centering surfaces, shaped as cylinders mantles, on the hub. Since, for production reasons, a certain tolerance range for the centering surfaces of both the rotational unit and the hub exists, the centering surfaces must be dimensioned in such a way that a certain minimum permitted clearance is assured. In certain cases, the clearance may become so large that, to a great extent, the rotational unit becomes excentrically mounted on the hub and that there is an increased risk for it becoming stuck due to rust, which makes its removal more difficult.
Applications in which eccentrically mounted rotational units may involve functional problems are for example brake drums for motor vehicles. An eccentrically mounted brake drum results in a varying braking torque, which in turn leads to vibrations in the steering wheel and/or the vehicle passenger compartment, which normally is perceived as very annoying by the driver.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above-mentioned problems regarding rotational units by means of a satisfactory centering, while maintaining favorable qualities for mounting and a reduced risk for it becoming stuck due to rust (fitting rust).
Said object is achieved by means of a device according to the present invention, the characterizing features of which will become apparent from the subsequent disclosure and within claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in greater detail with an embodiment, with reference to the annexed drawings, in which:
FIG. 1 shows an axial cross-section of a rotational unit in the form of a brake drum mounted on a hub, according to the present invention,
FIG. 2 shows, on a larger scale, a section of the brake drum and the hub,
FIG. 3 shows, on a further enlarged scale, a section of the brake drum and the hub clearly showing their mutual mounting surfaces,
FIG. 4 shows the brake drum and the hub during a first mounting stage, and
FIG. 5 shows an end view of the brake drum.
PREFERRED EMBODIMENTS
The chosen example shows a rotational unit in the form of a brake drum 1 which is mounted on a hub 2 which is rotatable around a geometric axis 3 of rotation. The hub may be fixed to a (not shown) drive shaft of a motor vehicle, the brake drum 1 being adapted to be rotatably fixed to the hub and thus adapted to rotate together therewith, and thus also together with the drive shaft. The brake drum is normally arranged on the inside of a vehicle wheel and adapted to rotate together with the wheel. The brake drum forms part of a conventional brake system with (not shown) brake shoes which are carried by the vehicle so that they essentially do not rotate with the brake drum but are adapted to brake the vehicle by frictional contact against the cylindrical brake surface 4 of the brake drum, the centricity of which in relation to the axis 3 of rotation is of great importance for the braking function and comfort in the vehicle. The brake drum is a separate rotational unit with a rear section 5 which extends essentially in a radial plane and which presents mounting surfaces 6, 7 intended for cooperation with corresponding mounting surfaces 8, 9 on the hub 2.
FIG. 2 shows a slightly enlarged partial view of FIG. 1, which is chosen so that it is apparent which section of the brake drum and the hub forms the mounting surfaces 6-9. The mounting surfaces f
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Fagergren Mats
Ohlson Rolf
AB Volvo
Chop Andrea
Green Brian K.
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