# US 2012/0073283 A1 · Hydraulic continuously variable transmission structure for automobile and automobile having the same

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- Number: US 2012/0073283 A1
- Document ID: US20120073283A1
- Status: Published application
- Kind: A1
- Application number: 13/281,946
- Filed: 2011-10-26
- Published: 2012-03-29
- Earliest claimed: 2009-04-28
- Inventors: Zhenfang WU
- Web page: https://patentgrep.com/patent/US20120073283A1

## CPC

- B60K 17/356: having fluid or electric motor, for driving one or more wheels
- B60K 17/10: of fluid gearing
- B60K 17/14: the motor of fluid or electric gearing being disposed in, or adjacent to, traction wheel
- F16H 61/4061: Control related to directional control valves, e.g. change-over valves, for crossing the feeding conduits
- B60K 7/0015: {the motor being hydraulic}
- B60K 2007/0092: {the motor axle being coaxial to the wheel axle}
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F16H: GEARING

## Abstract

The present invention provides a hydraulic continuously variable transmission structure for an automobile comprising an oil tank, a tee joint, a hydraulic pump, an automobile speed regulation valve, an astern valve and a hydraulic motor, wherein the oil tank, the hydraulic pump, the automobile speed regulation valve, the astern valve and the hydraulic motor are connected via oil pipes to form an integral hydraulic continuously variable transmission structure. An automobile adopting the hydraulic continuously variable transmission structure for an automobile is also provided. According to the present application, continuously variation of speed ratio may be achieved.

## Claims

### Claim 1

A hydraulic continuously variable transmission structure for an automobile, comprising:
an oil tank (17);
a tee joint (13) having three connecting ends;
a hydraulic pump (18), which is arranged behind an engine (10) or a clutch (11), wherein the hydraulic pump (18) is in communication with the oil tank (17) and is connected to a first connecting end of the tee joint (13);
an automobile speed regulation valve (12) having one end connected to a second connecting end of the tee joint (13) and the other end connected with the oil tank (17);
an astern valve (14) connected to a third connecting end of the tee joint (13) and in communication with the oil tank (17); and
a hydraulic motor (15) connected with the astern valve (14) and wheels (16),
wherein the oil tank (17), the hydraulic pump (18), the automobile speed regulation valve (12), the astern valve (14) and the hydraulic motor (15) are connected via oil pipes to form an integral hydraulic continuously variable transmission structure.

### Claim 2 (depends on 1)

The hydraulic continuously variable transmission structure for an automobile according to claim 1, wherein there is one, two or four hydraulic motors (15), wherein in the case where there is one hydraulic motor (15), the hydraulic motor (15) is mounted before the differential; in the case where there are two hydraulic motors (15), the hydraulic motors (15) are respectively mounted on two rear wheels or on two front wheels, and in the case where there are four hydraulic motors (15), the hydraulic motors (15) are respectively connected to the four wheels comprising the two front wheels and the two rear wheels.

### Claim 3 (depends on 1)

The hydraulic continuously variable transmission structure for an automobile according to claim 1, wherein the hydraulic motor (15) and the hydraulic pump (18) have identical structures and each of them comprises:
a stator (1) of a circular structure, a plurality of oil input/output ports (3) are disposed on the outer circumference of the stator, hydraulic oil distribution grooves (6) are disposed on the inner circumference (5) of the stator, wherein the oil input/output ports (3) are in communication with the respective hydraulic oil distribution grooves (6), and wherein the ends of the distribution grooves (6) extend towards the inner circumference (5) so as to form a taper triangular relief groove (4); and
a rotor (2) having blades (8) disposed thereon, wherein the rotor (2) is provided with blade grooves cooperating with the blades (8) and a spring (7) is mounted at the bottom of each blade groove.

### Claim 4 (depends on 1)

The hydraulic continuously variable transmission structure for an automobile according to claim 1, wherein the astern valve (14) is a rotary core type two-position four-way valve or a translation type two-position four-way valve.

### Claim 5 (depends on 1)

An automobile adopting the hydraulic continuously variable transmission structure for an automobile according to claim 1.