Joints and connections – Interfitted members – Radially interposed shim or bushing
Patent
1987-02-09
1990-03-06
Reese, Randolph A.
Joints and connections
Interfitted members
Radially interposed shim or bushing
403372, F16D 106
Patent
active
049061259
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for the production of a locking or braking effect between two elements whose surfaces face each other, and between which surfaces the device is designed to be inserted and manoeuvred into a position which produces the said locking or braking effect. Such elements can, for example, comprise a shaft and a hub liner with concentric cylindrical surfaces, between which it is desired to form a friction joint and/or shear strain, or a controlled braking effect.
The invention relates generally to that area of engineering which includes torque bushes, clamping bushes, shaft couplings, friction couplings and the like.
Among mounting connections and devices for torque and load transmission between, for example, a shaft and a hub which are currently available, there are shrink-fit joints, which are produced by the heating and/or cooling of surfaces and components which have been machined to fine tolerances in advance. There are also keyway or spline joints, tapered clamping bushes and expanding clamping sleeves of various kinds, as well as hydraulically activated connections and such connections achieved with capillary-creeping, self-hardening adhesive.
SUMMARY OF THE INVENTION
There are a number of demands and requirements upon connecting devices within the above-mentioned area of technology. A primary demand with regard to shaft connections is that the connection should transmit as much torque or load as possible in relation to the shaft dimension. The outer and inner diameters of the hub should also be as small as possible in relation to the size of the shaft, and, where possible, the stress produced upon the shaft and the hub should be uniform. In this way, the minimum external dimensions and the lowest weight are achieved. An important aspect is the requirement for a uniform distribution of pressure over relatively large areas of the joint. Further, the demands upon both the dimensional and positional tolerances and the surface fineness of the machine components should be moderate. Costly machining of keyways, cones, shoulders and holes for stop bolts etc. should be avoided. Mounting of the locking device should be carried out quickly and easily without special tools or any specialist knowledge of the handling of the device. Nor especially should mounting result in any positional shift of the machine parts which are to be connected to the device. A requirement is thus, that the frictional drag and surface pressure etc. which arise during the locking fast of the device should, to as small degree as possible, limit the manoeuvrability of the device during mounting and locking. The locking effect of the device should, further, not be affected by external loads, whatever their direction. Nor should there be any significant sensitivity to high or low temperatures, ageing or any normal stresses and strains. It is, in addition, an advantage if the setting or locking position of the device can be checked from outside the device. Finally, a satisfactory locking device should be able to be removed easily in order to free the previously connected components.
Despite the above demands and requirements, the device should also be cheap and economical with resources, even if the device ought, for non-corrosive purposes, to be produced from a high-grade, corrosion-resistant material. The object of the invention is to produce a device which fulfils all of the above demands and requirements, and this object is achieved by a device, the characteristics of which are given in the appended patent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be more close y described with design examples and with reference to the appended drawings, of which FIG. 1 is a plan view of an outspread sleeve wall which is part of a locking bush designed in accordance with the invention, FIG. 2 is an end view of the locking bush and FIG. 3 shows the locking bush in FIGS. 1 and 2 mounted between a shaft and a hub. FIG. 4 is a plan view of an outspread sleeve wall wh
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Cuomo Peter M.
Reese Randolph A.
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