close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3023044

код для вставки
Feb. 27, 1962
J. CHUNG
3,023,034
SHAFT BUSHING
Filed July 25, 1960
F | G. 1
2 Sheets-Sheet 1
'
Z2/¢\\\ \@
_/
INVENTOR.
JACKSON CHUNG
2 —|->
BY 777- d,
ATTORNEY
Feb. 27, 1962
J. CHUNG
3,023,034‘
SHAFT BUSHING
Filed July 25, 1960
2 Sheets-Sheet 2
FIG. 6
JACKSON
INVENTOR.
CHUNG
BY 72?. 67%
ATTORNEY
,.
United States
rim
I
aszaasr
Patented Feb. 27, 1962
1
2
3,023,034
FIGURE 2 is a cross sectional view of the sheave and
my bushing and a partial cross sectional view of the
shaft, the section of the sheave and bushing being taken
SHAFT BUSHING
Jackson Chung, Mishawaka, Ind., assignor to Dodge
Manufacturing Corporation, Mishawaka, End, a corpo
ration of Indiana
Filed July 25, 1%0, Ser. No. 44,993
9 Claims. (Cl. 287-52)
This invention relates to bushings and more particular
on line 2——2 of FIGURE 1;
'
FIGURE 3 is a side elevational view of my coupling
removed from the sheave and shaft;
FIGURE 4 is an elevational view of the shaft bushing
shown in the preceding ?gures;
FIGURE 5, is a vertical cross sectional view of the
ly to bushings for mounting sheaves, pulleys, sprockets, 10 bushing shown in the preceding ?gures, taken on line
5—5 of FIGURE 3; and
couplings and similar machine elements on shafts.
FIGURE 6 is a fragmentary cross sectional view of a
The present commonly employed methods of rigidly
mounting sheaves, pulleys and the like on shafts for ro
tation therewith, involve the use of tapered shafts and
modi?ed form of the invention taken on the same sec
tional line as the view of FIGURE 5.
Referring more speci?cally to the drawings wherein
hubs, or split tapered bushings either of the single type 15
are shown two embodiments of the invention which are
in which an externally tapered bushing seats in a tapered
at present preferred for the purpose of illustration but
not of limitation, numeral 16 designates a sheave of the
multiple V-belt drive type having a rim 12, hub 14 and
internally tapered member. In the latter type the larger
member is normally provided with a straight external 20 disc 16 connected integrally to the hub and rim at the
longitudinal center thereof. The hub has a straight
surface parallel with the shaft for seating on a straight
cylindrical bore 18 and may be provided with‘ a key-way
hub of the machine element, and the smaller section is
20 for receiving a key 22; however, the key-way and
provided with a straight internal surface for gripping
key may be omitted in certain installations without in
the shaft on which the machine element is mounted. In
hub of the machine element or of the double type in
which a small externally tapered member seats in a larger
the mounting operation the larger section is expanded 25 terfering with the satisfactory operation of the machine
element. Sheave 10 is conventional in construction and
to engage the hub and the smaller member is contracted
design and, as pointed out previously herein, is only one
to grip the shaft, by the use of a plurality of screws or
of a number of machine elements having hubs similar
to the one shown at numeral 14 with which the present
bushings of either single or double member construc 30 shaft bushing can effectively be used. The sheave is
shown mounted on a straight cylindrical shaft 24 and is
tion are satisfactory for most purposes, the various types
bolts which urge the tapered surfaces of the two mem
bers together. While these conventional types of tapered
frequently involve intricate machining operations, are
di?icult to assemble and mount properly on a shaft, or
secured rigidly thereon for rotation therewith by my
one-piece, expandable and contractible bushing. The
bushing may be provided with a key-Way 26 for key 28
body portion of the machine element which in certain 35 to connect the bushing more positively to the shaft.
The present bushing, generally designated by the nu
installations may be dangerous to the operator or inter
meral
30, consists of an annular body member 32 of
fere with adjacent parts of the machine. It is therefore
steel or other suitable material having a longitudinally
one of the primary objects of the present invention to
straight external surface 34 for engaging the wall of
provide a relatively simple compact bushing which can
be used with any straight bore hub and shaft and which 40 bore 18 in sheave hub 14 and a longitudinally straight
internal surface 33 for engaging and gripping shaft 24.
can easily be fabricated using standard machine tools
When bushing 30 is in its unexpanded condition, its
without involving any intricate machining or assembling
outside diameter is preferably such that it will ?t snugly
operations.
in the hub bore without binding and the internal diam
Another object of the invention is to provide a bushing
for mounting machine elements of the aforesaid type, 45 eter is such that the bushing will slip freely on shaft 24.
Whlie the longitudinal length of body member 32 is not
consisting principally of a one-piece body portion
important, it is preferable that the member be substantial
which is simultaneously contracted to grip the shaft
ly the same length as the hub so that, when the bushing
and expanded to engage an internal surface of the ma
is mounted in place within the sheave, the two ends will
chine element by the tightening of two easily reached
locking screws, and which is con?ned completely within 50 be ?ush with the respective ends of hub 14.
Body member 32 is divided into four principal seg
the hub of the machine element devoid of any projecting
ments consisting of two expandable external segments 42
screws, bolts, lugs or bosses,
and 44 and two contractible internal segments 46 and 48,
Still another object of the invention is to provide a
by a radial slot 50 extending completely through the body
bushing of the aforesaid type which can be mounted on
a shaft and into the hub of a machine element as a com 55 member both from end-to-end and from the external to
the internal surfaces, and two lateral slots 52 and 54 ex.
pletely assembled unit requiring merely the tightening
include parts or elements projecting beyond the hub or
of a plurality of locking screws all available to the op
erator from a single side.
A further object is to provide a simultaneously ex
tending through the body member from end-to-end and '
inwardly from one point on external surface 34 to the
proximity of another point on the external surface, leaving
segments 42 and 44 attached to the main body portion
60
by relativelv thin sections of metal 56 and 58, respective
couplings, pulleys and the like, which will effectively
ly. Slots 52 and 54‘ extend parallel to each other and to
adapt and adjust itself to ‘the hub ‘of the machine ele
pandable and contractible one-piece bushinggfor sheaves,
ment and the shaft when it is secured in place on the
shaft and which will positively and automatically re
radial slot 50 and may vary in width within limits, where
as radial slot 50 must be su?iciently wide to permit con
tractible segments 46 and 48 to close around and grip the
lease the hub and shaft when the machine element is 65
shaft ?rmly without completely closingthe slot.
»
‘
In order to'expand segments 42 and 44 for contact
Additional objects’ of the invention will become ap
with the Wall of bore 18 and to contract segments 46 and
parent from the following description and accompany
48 for contact with shaft 24, tapered holes 60 and '62 '7
ing drawings, wherein:
~
>
FIGURE 1 is a side elevational view of a sheave and 70 are placed in-slots‘52 and 54 near the open ends thereof,
but preferably in the radial center of annular body mem
my bushing, showing the bushing secured in operating
being removed from the shaft.
position on a shaft;_ S _
4
~
-_-_ ‘ber 32, andrare threaded from one end through-a major
3
3,023,034
4
portion of their length, and tapered socket locking screws
Further, in place of threaded holes 60, 62 and 80 and
64 and 66 are threaded into holes 60 and 62, respec
the corresponding screws, tapered screws and nuts may
tively. When screw 64 is tightened in hole 60 it applies
pressure onto the free end segment 42 causing it in effect
be used in conjunction with smooth, inwardly tapered
holes.
to pivot on section 56 and move outwardly into engage=
The tightening of the screws in the nuts causes
the external segments to expand and the internal segments
to contract. Additional changes and modi?cations may
be made to suit requirements.
I claim:
1. A one-piece bushing for mounting on a shaft a
machine element having a hub with a longitudinal bore,
comprising an annular body having an external surface
parallel with the wall of the hub bore and an internal
surface parallel with the periphery of the shaft, a slot _ex
ment with the wall of the hub bore. Simultaneously
therewith the screw also applies pressure onto segment 46
causing it to contract, pivoting primarily at the thin sec
tion of metal adjacent slot 52 indicated at numeral 68,
and to move inwardly into engagement with the shaft.
Likewise, when screw 66 is tightened in hole 62, it applies
pressure onto the free end of segment 44 causing it to
pivot on section 58 and move outwardly into engagement
with the wall of the hub bore, and simultaneously applies
tending through said body, slots on opposite sides of said
pressure onto segment 48 causing it to contract, pivoting 15 ?rst mentioned slot extending inwardly from points on
on the thin section at numeral 70, and to move into en
said external surface adjacent said ?rst mentioned slot to
gagement with the shaft. in the operation of mounting
points adjacent to and spaced inwardly from said external
the sheave on a shaft, the two screws are preferably
surface and dividing said body into external and internal
tightened alternately in short turns in order to equalize
segments, said body having a hole intersecting each of
the degree of expansion and contraction of segments 42 20 said second mentioned slots, and means in each of said
and 44 and 46 and 48, respectively. While most of the
holes for simultaneously expanding said external segments
pivotal movement of segments 46 and 48 occurs at the
points indicated at numerals 68 and 79, a slight amount
into contact with the wall of the hub bore and contract
of pivotal action also occurs at the point in annular
body member 32 opposite slot 50, particularly if the body 25
ing the respective internal segments into contact with the
shaft.
2. A bushingfor mounting on a shaft a machine ele
member contains either or both key~ways Z0 and 26.
ment having a .hub with a longitudinal bore, comprising
One of the principal advantages of {the present bushing
an annular body having an external surface parallel with
over the conventional tapered'bushings previously referred
the wall of the hub bore and an internal surface parallel
to herein, resides in the simplicity of construction and
with the axis of the shaft, a radial slot extending through
operation. Since external and internal surfaces 34 and 30 said body from the external surface to the internal sur
38, key-ways 2i} and 26, and slots 5%, 52 and 54 constitute
face, and a lateral slot on veach side of said radial slot
the principal formed features of the bushing, substan
extending inwardly from points on said external surface
tially the entire bushing can easily be :made without any
adjacent said radial slot to points adjacent .to and spaced
intricate machining operation. A further important ad
inwardly from said external surface and dividing said
vantage of the bushing is the ‘fact that the entire opera 35 body into external and internal segments, and means for
tion of ‘securing the bushing to the shaft and the sheave
simultaneously urging said external segments outwardly
to the bushing ‘is accomplished by merely tightening the
and the respective internal segments inwardly.
two screws 64 and 66 and that the inherent resiliency of
3. A one-piece bushing for mounting on a shaft a ma
the metal forming sections 56 and 58 withdraws segments
chine element having a hub with a longitudinal bore, com
42 and 44 ‘from the wall of the hub bore andireturns 40 prising an annular ‘body having an external surface par
them to their fully disengaged position without any ex
allel with the wall of the hub .bore and an internal sur
ternal force "being required. ‘Likewise the inherent
face parallel with the periphery of the shaft, a slot ex
resiliency of the metal forming sections 68 and 70 ex
tending through said body, slots on-opposite sides of said
pands segments 46 and 48,’ releasing shaft 24 and permit
?rst mentioned slot extending inwardly from points on
ting the bushing to be ‘readily removed therefrom. While
said external surface adjacent said ?rst mentioned slot
body member 32 is shown as a true circle, the external
to points adjacent to and spaced inwardly from said ex
and internal surfaces may be cammed to provide optimum
ternal surface, said second mentioned slots dividing said
adjustment of the bushing to the shaft and sheave hub.
body into two external segments and two internal seg
In some installationscomplete vequalization of pressure
ments, said body having a threaded tapered hole inter
at opposite ends of the bushing may be required or desir; 50 secting each of said second mentioned slots and extending
able. 'More accurate control in obtaining this equaliza
inwardlyfrom one end of thebushing, and tapered screws
tion is accomplished with the modi?ed form of the inven
threadedly received in said holes for simultaneously ex
tion illustrated in FIGURE 6, in which only one expand
pandlng said external segments intocontact with the‘wall
able segment and one contractible segment are shown.
These parts, vbeing substantially the same as ‘those corre
sponding parts of the embodiment previously described,
of the hub vbore and contractingthe respective internal
55 segments into contact with theshaft.
'
i
4. Abushing for mounting on a shaft a machine ele
are referred to by the same numerals. vIn this ‘modi?ed
ment having a hub with a longitudinal bore, comprising
form, ‘hole $0 is tapered inwardly from .both ends and
an annular body'having an external surface parallel with
these two tapered portions of each hole are threaded to
the wall of the hub bore and an internal surface parallel
receive ‘tapered screws 82 and 84. When the bushing 60 .with-the axis of‘ the shaft, a slot extending-through said
is being mounted on the shaft with the sheave, the screws
body, slots on opposite sides of-said ?rst mentioned slot
are ‘tightened intermittently in short turns until the bush
.extendinginwardly from points on said external surface
- ing is fully secured to the shaft and the sheave to the
adjacent-said ?rst mentioned slot to points adjacent to
bushing. ‘When the sheave is ‘to be removed,'the screws
and spaced inwardly from said external surface, said sec
are loosened and segments 42, 44, 46 and 48 disengage
ond mentioned slots 'Vbeing parallel to each other and
themselves from the sheave hub and shaft, releasing both 65 equally spaced from said'?rst mentioned-slot and divid
the "bushing and sheave.
V
i
ing said body into external and internal fsegments, said
‘ ‘Although only one embodiment of the presentbushing
bodyhaving a hole-intersecting each of said second men
and one modified form thereof are described in detail
tionedslots, and means in eachof said holes for simul
herein, various changes in theconstruction and design 70 taneouslyexpanding said external segments into contact
of the bushing maybe made without departing from the
with the wallof-the hub bore and contracting the respec
scope {of 'the invention. For example, the direction of
tive internal segments into contactwith the vshaft.
the-slots in annular body member 32 may beshifted and ' '
5. Av bushing for mounting on a shaft ,a machine ele
the position of holes 60 and 62 may be moved within
slots 52 and 54, in order "to "meet special requirements.
ment having ahub with a longitudinal bore, comprising
an annular body having a straight external surface paral
3,023,034
6
lel with the wall of the hub bore, a straight internal sur
face parallel with the axis of the shaft, a slot extending
through said body, slots on opposite sides of said ?rst
mentioned slot extending inwardly from points on said
external surface adjacent said ?rst mentioned slot to
said lateral slots being parallel to each other and to said
radial slot and dividing said body into two external seg
points adjacent to and spaced inwardly from said ex
ternal surface, said second mentioned slots being parallel
to each other and equally spaced from said ?rst men
tioned slot and dividing said body into two external seg
ing, and tapered screws threadedly received in said holes
for simultaneously expanding said external segments into
ments and two internal segments, said body having a 10
8. A bushing for mounting on a shaft a machine ele
ment having a hub with a longitudinal bore, comprising an
threaded tapered hole intersecting each of said second
mentioned slots and extending inwardly from one end
of the bushing, and tapered screws threadedly received in
said holes for simultaneously expanding said external seg
ments and two internal segments, said body having a
threaded tapered hole intersecting each of said lateral
slots and extending inwardly from one end of the bush
contact with the wall of the hub bore and contracting the
respective internal segments into contact with the shaft.
annular body having an external surface parallel with the
wall-of the hub bore and an internal surface parallel with
the axis of the shaft, a radial slot extending through said
ments into contact with the wall of the hub bore and 15 body from the external surface to the internal surface, a
lateral slot on each side of said radial slot extending in
contracting the respective internal segments into contact
wardly from points on said external surface adjacent said
with the shaft.
radial slot to points adjacent to and spaced inwardly from
6. A bushing for mounting on a shaft a machine ele
said external surface and dividing said body into external
ment having a hub with a straight longitudinal bore, com
and internal segments, said body having a threaded hole
prising an annular body having a straight external surface
intersecting each of said lateral slots and being tapered
parallel with the wall of the hub bore and a straight in
inwardly from each end of the body, and tapered screws
ternal surface parallel with the axis of the shaft, a radial
threadedly received in opposite ends of said holes for
slot extending through said body from the external sur
simultaneously expanding said external segments into con
face to the internal surface, a lateral slot on each side
of said radial slot extending inwardly from points on 25 tact with the wall of the hub bore and contracting the
respective internal segments into contact with the shaft.
said external surface adjacent said radial slot to points
9. A bushing for mounting on a shaft a machine ele
adjacent to and spaced inwardly from said external sur
ment having a hub with a longitudinal bore, comprising
face, said lateral slots being parallel to each other and
an annular body having an external surface parallel with
dividing said body into two external segments and two
internal segments, said body having a threaded tapered 30 the Wall of the hub bore and an internal surface parallel
with the periphery of the shaft, a slot extending through
hole intersecting each of said lateral slots and extending
said body, slots on opposite sides of said ?rst mentioned
inwardly from one end of the bushing, and tapered screws
slot extending inwardly from points on said external sur
threadedly received in said holes for simultaneously ex
face adjacent said ?rst mentioned slot to points adjacent
panding said external segments into contact with the wall
of the hub bore and contracting the respective internal 35 to and spaced inwardly from said external surface and
dividing said body into external and internal segments,
segments into contact with the shaft.
said body having a threaded hole intersecting each of said
7. A bushing for mounting on a shaft a machine ele
second mentioned slots and being tapered inwardly from
ment having a hub with a straight longitudinal bore, com
each end of the body, and tapered screws threadedly re
prising an annular metal body having a straight external
surface parallel with the wall of the hub bore and a 40 ceived in opposite ends of said holes for simultaneously ex
panding said external segments into contact with the wall
straight internal surface parallel with the axis of the shaft,
of the hub bore and contracting the respective internal seg- '
an external and an internal longitudinal key-way in said
ments into contact with the shaft.
body, a radial slot extending through said body from the
external surface to the internal surface on the side there
References Cited in the ?le of this patent
of opposite said key-ways, a lateral slot on each side of 45
UNITED STATES PATENTS
said radial slot extending inwardly from points on said
external surface adjacent said radial slot to points adja
Charlton _____________ .... Apr. 30, 1872
126,183
cent to and spaced inwardly from said external surface,
Brent‘ ..__., ___________ ._.. June 5, 1928
1,672,601
Документ
Категория
Без категории
Просмотров
0
Размер файла
594 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа