US 8,308,597 B2Granted

Speed change transmission system

AssigneeKubota Corporation

InventorsMinoru Hiraoka, Satoshi Machida, Yoshiyuki Katayama

Life of this patent

Estimating the term…

Loading patent…

Abstract

In order to provide a speed change transmission system which can be obtained compactly, while obtaining output at steplessly varied speeds over a large speed change range only by carrying out a simple shifting operation, the speed change transmission system has a hydrostatic stepless transmission to which engine drive is inputted. A planetary transmission device (P) has a plurality of planetary transmission mechanisms, for combining output of the stepless transmission and engine drive not undergoing speed change action by the hydrostatic stepless transmission. A plurality of transmission shafts are provided with a plurality of speed range setting clutches switchable for converting the combined driving force from the planetary transmission device (P) to a driving force in a plurality speed ranges, and transmitting it to an output rotary member. The plurality of transmission shafts are juxtaposed and arranged in parallel.

Claims17

Dependent claims

A speed change transmission system having:

a hydrostatic stepless speed change device for receiving engine drive;
and
a planetary transmission device having a plurality of planetary transmission mechanisms for combining output of the hydrostatic stepless speed change device and the engine drive not undergoing a speed change action by the hydrostatic stepless speed change device;
a combined driving force from the planetary transmission device being stage-divided into a plurality of speed ranges, and subjected to stepless speed changing at each speed range for output from an output rotary member;
the speed change transmission system comprising:
a first output gear interlocked to the planetary transmission device;
a first input gear meshed with the first output gear;
a first transmission shaft for supporting the first input gear;
a first speed range setting clutch corresponding to the first transmission shaft, and having a first state for fixing the first input gear to the first transmission shaft, and a second state for allowing rotation of the first input gear relative to the first transmission shaft;
a second output gear interlocked to the planetary transmission device;
a second input gear meshed with the second output gear;
a second transmission shaft for supporting the second input gear;
and
a second speed range setting clutch corresponding to the second transmission shaft, and having a first state for fixing the second input gear to the second transmission shaft, and a second state for allowing rotation of the second input gear relative to the second transmission shaft;
wherein the first and second transmission shafts are arranged in parallel for selectively transmitting drive to the output rotary member,
wherein the speed change transmission system comprises at least three transmission shafts including the first and second transmission shafts, having corresponding gear pairs and corresponding speed range setting clutches, and interlockable to the planetary transmission device through the gear pairs and the speed range setting clutches, and
wherein the at least three transmission shafts are arranged in parallel for selectively transmitting drive to the output rotary member.

14 more elements

A speed change transmission system having:

a hydrostatic stepless transmission for receiving engine drive;
and
a planetary transmission device having a plurality of planetary transmission mechanisms for combining output of the hydrostatic stepless transmission and the engine drive not undergoing a speed change action by the hydrostatic stepless transmission;
a combined driving force from the planetary transmission device being stage-divided into a plurality of speed ranges, and subjected to stepless speed changing at each speed range for output from an output rotary member;
the speed change transmission system comprising:
a first output gear interlocked to the planetary transmission device;
a first input gear meshed with the first output gear;
a first transmission shaft for supporting the first input gear;
a first speed range setting clutch corresponding to the first transmission shaft, and having a first state for fixing the first input gear to the first transmission shaft, and a second state for allowing rotation of the first input gear relative to the first transmission shaft;
a second output gear interlocked to the planetary transmission device;
a second input gear meshed with the second output gear;
a second transmission shaft for supporting the second input gear;
and
a second speed range setting clutch corresponding to the second transmission shaft, and having a first state for fixing the second input gear to the second transmission shaft, and a second state for allowing rotation of the second input gear relative to the second transmission shaft;
wherein the first output gear and the first input gear have a gear ratio for forming a first speed range;
and
the second output gear and the second input gear have a gear ratio for forming a second speed range continuous with the first speed range and faster than the first speed range,
wherein the speed change transmission system comprises at least three transmission shafts including the first and second transmission shafts, having corresponding gear pairs and corresponding speed range setting clutches, and interlockable to the planetary transmission device, and
wherein the at least three transmission shafts are arranged in parallel for selectively transmitting drive to the output rotary member.

16 more elements

A speed change transmission system having:

a hydrostatic stepless speed change device for receiving engine drive;
and
a planetary transmission device having a plurality of planetary transmission mechanisms for combining output of the hydrostatic stepless speed change device and the engine drive not undergoing a speed change action by the hydrostatic stepless speed change device;
a combined driving force from the planetary transmission device being stage-divided into a plurality of speed ranges, and subjected to stepless speed changing at each speed range for output from an output rotary member;
the speed change transmission system comprising:
a first output gear interlocked to the planetary transmission device;
a first input gear meshed with the first output gear;
a first transmission shaft for supporting the first input gear;
a first speed range setting clutch corresponding to the first transmission shaft, and having a first state for fixing the first input gear to the first transmission shaft, and a second state for allowing rotation of the first input gear relative to the first transmission shaft;
a second output gear interlocked to the planetary transmission device;
a second input gear meshed with the second output gear;
a second transmission shaft for supporting the second input gear;
and
a second speed range setting clutch corresponding to the second transmission shaft, and having a first state for fixing the second input gear to the second transmission shaft, and a second state for allowing rotation of the second input gear relative to the second transmission shaft,
wherein the first and second transmission shafts are arranged in parallel for selectively transmitting drive to the output rotary member;
and
wherein each of the first transmission shaft and the second transmission shaft has a friction clutch mounted thereon, thereby allowing a selective transmission of drive from one of the first transmission shaft and the second transmission shaft to the output rotary member.

14 more elements

A speed change transmission system having:

a hydrostatic stepless transmission for receiving engine drive;
and a planetary transmission device having a plurality of planetary transmission mechanisms for combining output of the hydrostatic stepless transmission and the engine drive not undergoing a speed change action by the hydrostatic stepless transmission;
a combined driving force from the planetary transmission device being stage-divided into a plurality of speed ranges, and subjected to stepless speed changing at each speed range for output from an output rotary member;
the speed change transmission system comprising:
a first output gear interlocked to the planetary transmission device;
a first input gear meshed with the first output gear;
a first transmission shaft for supporting the first input gear;
a first speed range setting clutch corresponding to the first transmission shaft, and having a first state for fixing the first input gear to the first transmission shaft, and a second state for allowing rotation of the first input gear relative to the first transmission shaft;
a second output gear interlocked to the planetary transmission device;
a second input gear meshed with the second output gear;
a second transmission shaft for supporting the second input gear;
and
a second speed range setting clutch corresponding to the second transmission shaft, and having a first state for fixing the second input gear to the second transmission shaft, and a second state for allowing rotation of the second input gear relative to the second transmission shaft;
wherein the first output gear and the first input gear have a gear ratio for forming a first speed range;
and
the second output gear and the second input gear have a gear ratio for forming a second speed range continuous with the first speed range and faster than the first speed range, and
wherein each of the first transmission shaft and the second transmission shaft has a friction clutch mounted thereon, thereby allowing a selective transmission of drive from one of the first transmission shaft and the second transmission shaft to the output rotary member.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/440,083Filed 19 Mar 2008
Priority: JP 2007-24427620 Sep 2007
Published: US 2010/0184551 A122 Jul 2010
Granted: 13 Nov 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 47/04
The fluid gearing being of the volumetric type: the mechanical gearing being of the type with members having orbital motion
F16H 3/18
Essentially with both gears that can be put out of gear and continuously-meshing gears that can be disengaged from their shafts: gearings for…
F16H 2037/0886
Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft: with switching means,…
F16H 2200/2007
Characterised by the number of sets of orbital gears: with two sets of orbital gears