Transaxle

Patent metadata

Field	Value
Publication number	US-9453519-B2
Application number	US-201414179334-A
Country	US
Kind code	B2
Filing date	Feb 12, 2014
Priority date	Jul 5, 2013
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A transaxle includes a hydrostatic transmission and an axle driven by the hydrostatic transmission. The hydrostatic transmission includes a hydraulic pump and a hydraulic motor fluidly connected to each other. The hydraulic pump has a pump shaft. The hydraulic motor has a motor shaft drivingly connected to the axle. The motor shaft has an axis extended slantwise from an axis of the pump shaft. The transaxle further includes a gear train for transmitting power from the motor shaft to the axle, and a gear locking system having a locking pawl. A gear of the gear train is adapted to engage with the locking pawl.

First claim

What is claimed is:

1. A transaxle comprising:
a transaxle casing;
a hydrostatic transmission disposed in the transaxle casing; and
an axle disposed in the transaxle casing and driven by the hydrostatic transmission,
wherein the hydrostatic transmission includes a hydraulic pump and a hydraulic motor fluidly connected to each other,
wherein the hydraulic pump has a pump shaft extended perpendicular to the axle,
wherein the hydraulic motor is disposed between the hydraulic pump and the axle,
wherein the hydraulic motor includes:
a motor shaft drivingly connected to the axle;
plungers reciprocally movable parallel to an axis of the motor shaft; and
a fixed swash plate secured by the transaxle casing and abutting against the plungers, and
wherein the motor shaft is passed through the fixed swash plate rotatably relative to the fixed swash plate so that the axis of the motor shaft is extended slantwise from an axis of the pump shaft.

2. The transaxle according to claim 1 , further comprising:
a gear train for transmitting power from the motor shaft to the axle; and
a gear locking system having a locking pawl,
wherein a gear of the gear train is adapted to engage with the locking pawl.

3. The transaxle according to claim 2 ,
wherein the gear train includes:
a bevel pinion fixed on the motor shaft; and
a bevel gear meshing with the bevel pinion.

4. The transaxle according to claim 3 ,
wherein the bevel pinion serves as the gear adapted to engage with the locking pawl.

5. The transaxle according to claim 1 ,
wherein the axes of the pump shaft and the motor shaft have an acute angle therebetween.

6. The transaxle according to claim 5 ,
wherein the hydrostatic transmission includes:
a center section having a pump mounting surface and a motor mounting surface,
wherein the center section is detachably attached to the transaxle casing,
wherein respective ports are open at the pump mounting surface and the motor mounting surface so that the hydraulic pump mounted on the pump mounting surface and the hydraulic motor mounted on the motor mounting surface are fluidly connected to each other via the ports, and
wherein the pump mounting surface and the motor mounting surface have an obtuse angle therebetween.

7. A transaxle comprising:
a transaxle casing;
a hydrostatic transmission disposed in the transaxle casing;
an axle disposed in the transaxle casing and driven by the hydrostatic transmission;
a gear train for transmitting power from the motor shaft to the axle; and
a gear locking system having a locking pawl,
wherein the hydrostatic transmission includes a hydraulic pump and a hydraulic motor fluidly connected to each other,
wherein the hydraulic pump has a pump shaft extended perpendicular to the axle,
wherein the hydraulic motor is disposed between the hydraulic pump and the axle and has a motor shaft drivingly connected to the axle,
wherein the motor shaft has an axis extended slantwise from an axis of the pump shaft,
wherein the gear train includes a bevel pinion fixed on the motor shaft, and a bevel gear meshing with the bevel pinion, and
wherein the gear train includes a gear adapted to engage with the locking pawl.

8. The transaxle according to claim 7 ,
wherein the bevel pinion serves as the gear adapted to engage with the locking pawl.

Assignees

• Kanzaki Kokyukoki Mfg Co Ltd

Inventors

• Saldierna Oscar H
• Yasuda Toshifumi
• Iwaki Koji
• Mizukawa Katsumoto
• Murashima Daisuke
• Iida Masaru

Classifications

• F15B15/26

  Locking mechanisms · CPC title

• F16H39/14

  with cylinders carried in rotary cylinder blocks or cylinder-bearing members · CPC title

• F15B15/08

  Characterised by the construction of the motor unit · CPC title

• B60Y2200/223

  Ridable lawn mowers · CPC title

• F16H39/06

  pump and motor being of the same type · CPC title