Joints and connections – Interfitted members – Radially interposed shim or bushing
Patent
1994-08-12
1996-07-16
Johnson, Blair
Joints and connections
Interfitted members
Radially interposed shim or bushing
403367, 403370, F16D 106
Patent
active
055361056
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a device for fixing a rotary body such as a pulley to a rotary shaft such as a motor shaft, and more specifically, to the device for fixing a rotary body to a rotary shaft which permits a slippage between the rotary body and the rotary shaft when the rotary body receives unexpected over-load.
BACKGROUND OF THE INVENTION
Conventionally, a key is inserted into key grooves formed on both the rotary body and the rotary shaft when a rotary body such as a pulley and a gear is to be fixed to a rotary shaft. This provides a direct power transmission between the rotary shaft and the rotary body even when an over-load force and an impact force occur at the rotary shaft, and has often produced troubles even with other elements.
On the contrary, the rotary body and the rotary shaft can be fixed by screws inserted in a traversal direction of the rotary shaft. However, this method makes less fixing strength, and occasionally more troublesome in the process of attaching screws, especially at the narrow area, because the screws have to be inserted in the traversal direction of the shaft.
Accordingly, it is an object of the invention to provide a device for fixing a rotary body to a rotary shaft which solves the above problems. The invention permits a slippage between the rotary body and the rotary shaft when an unexpected force such as an over-load force and an impact force occurs, but normally provides an appropriate fixing strength therebetween when both rotary body and shaft rotate together.
DISCLOSURE OF THE INVENTION
In the invention, a groove is formed at the outer surface of a rotary shaft or at the inner surface of a mounting hole of a rotary body. A pair of key members having a tapered contact surface are inserted into the groove in such a manner that both key members are arranged adjacently in the longitudinal direction of the rotary shaft as facing each tapered contact surface. The key numbers pushed in the longitudinal direction are displaced outward as guided by the tapered surface. The displaced key members make a contact with the inner surface of the mounting hole and the outer surface of the rotary shaft. Further pressure to key members allows one of key members to be pressed to the inner surface of the mounting hole and the other to be pressed to the outer surface of the rotary shaft. Thereby the rotary shaft and the rotary body are firmly fixed through the key members as by a wedge. Since the groove is only formed either at the rotary body or at the rotary shaft, when an impact force occurs to the rotary body, a slippage can be created between the rotary body and the rotary shaft, which prevents the breakage of other elements.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross section view of a device for fixing a rotary body along the line I--I of FIG. 2.
FIG. 2 is a plan view of the device of FIG. 1 along the line II--II.
FIG. 3 is a perspective view of a pair of key members.
FIG. 4 is a perspective view of an alternative embodiment of a pair of key members.
FIG. 5 is a cross section view of an alternative embodiment of a pressing bolt for fixing a rotary body along the line V--V of FIG. 6.
FIG. 6 is a plan view of the device of FIG. 5 along the line VI--VI.
FIG. 7 is a cross section view of an alternative embodiment of a pressing bolt for fixing a rotary body along the line V--V of FIG. 6.
FIG. 8 is a cross section view of a device for fixing a rotary body along the line VIII--VIII of FIG. 9.
FIG. 9 is a cross section view of the device of FIG. 8 along the line IX--IX.
FIG. 10 is a partial cross section view of a device for fixing a rotary body along the line, X--X of FIG. 11.
FIG. 11 is a plan view of the device of FIG. 10 along the line XI--XI.
FIG. 12 is a cross section view of a device for fixing a rotary body along the line XII--XII of FIG. 13.
FIG. 13 is a plan cross section view of the device of FIG. 12 along the line XIII--XIII.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is described below with accompanying dra
REFERENCES:
patent: 1138368 (1915-05-01), Feeley
patent: 1612769 (1926-12-01), O'Connell
patent: 2043272 (1936-06-01), Wallgren
patent: 2691541 (1954-10-01), Benedek
patent: 3656785 (1972-04-01), Lothar
patent: 3664167 (1972-05-01), Sack
Chop Andrea
Froebrich Alfred W.
Johnson Blair
Morrison Thomas R.
Myotoku Ltd.
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