Variable hydraulic transmission
View Patent ↗The invention refers to hydraulic rotation transmissions and can be used in power transmissions and transmissions where the stepless ratio variation is essential. It can also be used as stepless speed transmission for vehicles (FIG. 1 ). Getting any transmission ratio with higher performance factor is achieved by applying in the hydraulic transmission new scheme, including motionless and movable bodies containing two coupled rotors, composing of camshafts with pistons and separated by motionless wall. Transmission ratio varies from 0 to maximal value displacing the movable body in axial direction by means of overhanging control arm.
1. A controlled hydraulic transmission comprising:
a housing;
a plurality of caps;
two shafts;
a control unit; and
rotary mechanism of interaction with power fluid,
wherein a gear transmission is installed between one of the plurality of caps and one of a plurality of pistons of the rotary mechanism,
wherein the plurality of pistons of the rotary mechanism interact with the power fluid and are provided with sunk internal gearing,
wherein faces of the plurality of the pistons are machined to provide sliding contact with the plurality of the caps and core faces, and
wherein an outer surface of the plurality of pistons is formed by hypotrochoid that is defined by:
X=e (5 Sin τ−Sin 2τ),
Y=e (5 Cos τ+Cos 2τ),
where τ is an arbitrary parameter between 0 and 2π.
2. The controlled hydraulic transmission according to claim 1 , wherein the housing has an opening for a control arm and an internal cavity completely filled with the power fluid and a mechanism of rotary movement transformation.
3. The controlled hydraulic transmission according to claim 2 , wherein control unit is provided with a jutting arm fixed on an internal mechanism of rotary movement transformation and being able for displacement along the opening in the housing.
4. The controlled hydraulic transmission according to claim 3 , wherein an internal face of the plurality of caps, mounted on housing ends, is machined to provide sliding contact with the faces of the plurality of the pistons, at that the plurality of caps have a central hole for supporting the two shafts and fixed central gear internally toothed with a piston gear.
5. The controlled hydraulic transmission according to claim 4 , wherein the shafts provided with cam having cylindrical surface eccentric against a shaft axis of the shafts with eccentricity e and intended for running fit of a piston.
6. The controlled hydraulic transmission according to claim 1 , wherein central sockets are machined in cartridge ends for disposing other parts and there is mounting pad for control arm attachment on an external surface, and central opening cross-section profile is the external curve of epitrochoid:
X
=
e
7
(
24
Sin
τ
+
25
Sin
3
τ
)
,
Y
=
e
7
(
24
Cos
τ
+
25
Cos
3
τ
)
.
7. The controlled hydraulic transmission according to claim 6 , wherein there are partitions with flat end faces having sliding contact with the pistons end faces, central borings for running passages of driving shafts and the external surface, formed by the same epitrochoid as of the cartridge longitudinal opening cross-section, but with tolerances allowing longitudinal displacement of the cartridge relative the core.
8. The controlled hydraulic transmission according to claim 7 , wherein movable walls, placed in sockets of the cartridge ends, have sliding contact with a bottom of the socket and with clamp and are disc shaped with external diameter greater then 16e but a central hole formed by the same hypotrochoid as the external surfaces of the pistons with tolerances allowing piston travel through the hole.
9. The controlled hydraulic transmission according to claim 8 , wherein a plurality of clamps with a plurality of plain internal end faces, having sliding contact with a movable wall, and the central hole are attached to the cartridge ends.
10. A controlled hydraulic transmission comprising:
housing with opening for control arm fixed on internal mechanism of rotary movement transformation and internal cavity filled with power fluid and said rotary movement transformation;
caps, which internal face is machined to assure sliding contact with a piston face, the caps having hole for supporting two shafts,
wherein the two shafts are provided with a cam having cylindrical surface eccentric against of the shaft with eccentricity e and intended for running fit of a piston,
wherein the piston of the rotary movement transformation interact with the power fluid and is provided with sunk internal gearing,
wherein the face of the piston is machined to provide sliding contact with the caps, and
wherein an outer surface of the piston is formed by hypotrochoid that is defined by:
X=e (5 Sin τ−Sin 2τ),
Y=e (5 Cos τ+Cos 2τ),
where τ is an arbitrary parameter between 0 and 2π.
11. The controlled hydraulic transmission according to claim 10 , wherein central sockets are machined in cartridge ends for disposing other parts and there is mounting pad for control arm attachment on an external surface, and central opening cross-section profile is the external curve of epitrochoid:
X
=
e
7
(
24
Sin
τ
+
25
Sin
3
τ
)
,
Y
=
e
7
(
24
Cos
τ
+
25
Cos
3
τ
)
.
12. The controlled hydraulic transmission according to claim 11 , wherein there are partitions with flat end faces having sliding contact with the pistons end faces, central borings for running passages of driving shafts and the external surface, formed by the same epitrochoid as of the cartridge longitudinal opening cross-section, but with tolerances allowing longitudinal displacement of the cartridge relative the core.
13. The controlled hydraulic transmission according to claim 12 , wherein movable walls, placed in sockets of the cartridge ends, have sliding contact with a bottom of the socket and with clamp and are disc shaped with external diameter greater then 16e but a central hole formed by the same hypotrochoid as the external surfaces of the pistons with tolerances allowing piston travel through the hole.
14. The controlled hydraulic transmission according to claim 13 , wherein a plurality of clamps with a plurality of plain internal end faces, having sliding contact with a movable wall, and the central circular or shaped hole are attached to the cartridge ends.