Geometrical instruments – Distance measuring – Single contact with a work engaging support
Reexamination Certificate
2000-11-13
2002-09-17
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Distance measuring
Single contact with a work engaging support
C033S548000, C033S549000, C033S600000
Reexamination Certificate
active
06449868
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
A measuring apparatus for a power roller unit for a toroidal type continuous variable speed transmission according to this invention facilitates the work of assembling a toroidal type continuous variable speed transmission utilized, for example, as the speed change unit of a transmission for an automobile or a transmission for various industrial machines and also improves the assembling accuracy to thereby achieve an improvement in performance.
2. Related Background Art
It has been studied to use a toroidal type continuous variable speed transmission as shown in
FIGS. 3 and 4
of the accompanying drawings as a transmission for an automobile. In this toroidal type continuous variable speed transmission, as disclosed, for example, in Japanese Utility Model Application Laid-Open No. 62-71465, an input side disc
2
is supported concentrically with an input shaft
1
, and an output side disc
4
is fixed to the end portion of an output shaft
3
disposed concentrically with the input shaft
1
. Trunnions
6
a,
6
b
pivotally movable about pivots
5
a,
5
b
lying at locations twisted relative to the input shaft
1
and the output shaft
3
are provided inside a casing containing the toroidal type continuous variable speed transmission therein.
That is, these trunnions
6
a,
6
b
have the pivots
5
a,
5
b
provided concentrically with each other on the outer sides of the opposite end portions thereof. Also, the base end portions of displaceable shafts
7
a,
7
b
are supported on the intermediate portions of the trunnions
6
a,
6
b
and the trunnions
6
a,
6
b
are pivotally moved about the pivots
5
a,
5
b,
whereby the angles of inclination of the displaceable shafts
7
a,
7
b
are made adjustable. Power rollers
8
a,
8
b
are rotatably supported around the displaceable shafts
7
a,
7
b
supported on the trunnions
6
a,
6
b
. These power rollers
8
a,
8
b
are sandwiched between the mutually opposed inner sides
2
a,
4
a
of the input side and output side discs
2
and
4
. Each of these inner sides
2
a,
4
a
has its cross-section forming a concave surface obtained by being rotated along an arc centering around the pivots
5
a,
5
b
. The power rollers
8
a,
8
b
formed into spherical convex surfaces and the inner sides
2
a,
4
a
are in contact with each other. Hereinafter, the surfaces of the power rollers
8
a
and
8
b
which are in contact with the inner sides
2
a
and
4
a,
respectively, are referred to as the “peripheral surfaces” of the power rollers
8
a
and
8
b.
A pressing apparatus
9
of the loading cam type is provided between the input shaft
1
and the input side disc
2
, and the input side disc
2
is capable of being elastically pressed toward the output side disc
4
by this pressing apparatus
9
. This pressing apparatus
9
is comprised of a cam plate
10
rotatable with the input shaft
1
, and a plurality of (e.g. four) rollers
12
a,
12
b,
12
c
and
12
d
(not shown) held for rolling by a holder
11
. A driving side cam surface
13
which is a concavo-convex surface extending in the circumferential direction is formed on that surface (the left side as viewed in
FIGS. 3 and 4
) of the cam plate
10
which abuts against the holder
11
, and a driven side cam surface
14
of a similar shape is also formed on the outer side (the right side as viewed in
FIGS. 3 and 4
) of the input side disc
2
. The plurality of rollers
12
a
to
12
d
are supported for rotation about radial axes with respect to the center of the input shaft
1
.
When during the use of the toroidal type continuous variable speed transmission constructed as described above, the cam plate
10
rotates with the rotation of the input shaft
1
, the driving side cam surface
13
presses the plurality of rollers
12
a,
12
b,
12
c
and
12
d
toward the driven side cam surface
14
formed on the outer side of the input side disc
2
. As the result, the input side disc
2
is pressed against the plurality of power rollers
8
a,
8
b
and at the same time, the input side disc
2
is rotated on the basis of the pressing between the driving side and driven side cam surfaces
13
,
14
and the plurality of rollers
12
a,
12
b,
12
c
and
12
d
. The rotation of this input side disc
2
is transmitted to the output side disc
4
through the plurality of power rollers
8
a,
8
b,
and the output shaft
3
fixed to this output side disc
4
is rotated.
When the rotational speed ratio (change gear ratio) between the input shaft
1
and the output shaft
3
is to be changed and first, deceleration is to be effected between the input shaft
1
and the output shaft
3
, the trunnions
6
a,
6
b
are pivotally moved in a predetermined direction about the pivots
5
a,
5
b
. The displaceable shafts
7
a,
7
b
are then inclined so that as shown in
FIG. 3
, the peripheral surfaces of the power rollers
8
a,
8
b
may abut against the rather central portion of the inner side
2
a
of the input side disc
2
and the rather outer peripheral portion of the inner side
4
a
of the output side disc
4
, respectively. When conversely, acceleration is to be effected, the trunnions
6
a,
6
b
are pivotally moved in the opposite direction about the pivots
5
a,
5
b
. The displaceable shafts
7
a,
7
b
are then inclined so that as shown in
FIG. 4
, the peripheral surfaces of the power rollers
8
a,
8
b
may abut against the rather outer peripheral portion of the inner side
2
a
of the input side disc
2
and the rather central portion of the inner side
4
a
of the output side disc
4
, respectively. If the angle of inclination of the displaceable shafts
7
a,
7
b
is made intermediate of the angles shown in
FIGS. 3 and 4
, an intermediate change gear ratio is obtained between the input shaft
1
and the output shaft
3
.
Also,
FIGS. 5 and 6
of the accompanying drawings show an example of a more embodied toroidal type continuous variable speed transmission described in the microfilm of Japanese Utility Model Application No. 63-69293 (Japanese Utility Model Application Laid-Open No. 1-73552). An input side disc
2
and an output side disc
4
are rotatably supported around a tubular input shaft
15
through needle bearings
16
. Also, a cam plate
10
is spline-engaged with the outer peripheral surface of one end portion (the left end portion as viewed in
FIG. 5
) of the input shaft
15
, and the movement thereof away from the input side disc
2
is blocked by a flange portion
17
. This cam plate
10
and rollers
12
a,
12
b
together constitute a pressing apparatus
9
of the loading cam type for rotating the input side disc
2
while pressing it toward the output side disc
4
with the rotation of the input shaft
15
. An output gear
18
is coupled to the output side disc
4
by keys
19
,
19
, and the output side disc
4
and the output gear
18
are rotated in synchronism with each other.
In
FIG. 6
, the opposite end portions of a pair of trunnions
6
a,
6
b
are supported on a pair of support plates
20
a,
20
b
for pivotal movement and displacement in an axial direction (the front-to-back direction of
FIG. 5
or the left to right direction as viewed in FIG.
6
). That is, radial needle bearings
22
which are first radial bearings are provided between the outer peripheral surfaces of pivots
5
secured to the opposite end portions of the trunnions
6
a,
6
b
and the inner peripheral surface of a circular hole
21
formed in each support plate
20
. The outer peripheral surfaces of outer rings
23
constituting these radial needle bearings
22
are fitted as spherical convex surfaces in the circular holes
21
for pivotal movement and axial displacement.
In this manner, the displaceable shafts
7
a,
7
b
are supported in circular holes
24
a,
24
b
formed in the intermediate portions of the trunnions
6
a,
6
b
supported for pivotal movement and axial displacement between the pair of support plates
20
a,
20
b
. These displaceable shafts
7
a,
7
b
have support shaft portions
25
a,
25
b
and pivotally supporti
Gutierrez Diego
Jagan Mirellys
Miles & Stockbridge P. C.
NSK Ltd.
LandOfFree
Measuring apparatus for a power roller unit for a toroidal... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measuring apparatus for a power roller unit for a toroidal..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring apparatus for a power roller unit for a toroidal... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2909674